JP6922406B2 - Control device for injection molding machine and injection molding machine - Google Patents

Description

The present invention relates to a control device for an injection molding machine, and more particularly to a control device that warns an operator operating an injection molding machine of the possibility of an abnormality.

In Patent Document 1, on the display screen of operating conditions, the initial input items of the mold closing start position, the protruding forward position, the mold thickness, the resin name, which are the basic conditions of the resin mold data, the molded product wall thickness, and the molded product weight are color-coded. And inform the operator. Then, in Patent Document 1, after inputting the item, the condition is calculated and the initial operation condition is automatically set assuming an average case. Further, since the resin mold data has only three points, the resin name, the thickness of the molded product, and the weight of the molded product, it is easy to prepare the input data. Furthermore, conditions can be calculated and execution value confirmation can be corrected on the same screen, so operations can be performed efficiently.

Japanese Unexamined Patent Publication No. 6-114907

Since Patent Document 1 has only three points, the resin name, the thickness of the molded product, and the weight of the molded product, it is easy to prepare input data. However, the operator may not fully consider the characteristics of the resin material due to misunderstanding or misunderstanding, that is, the operator may perform an inappropriate operation for operating or setting the injection molding machine in an improper procedure. In this case, there is a risk of causing thermal deterioration of the resin in the plasticizing device, excessive torque of the screw during plasticizing, damage to the screw, and the like.

From the above, the present invention provides the operator with improper operation due to misunderstanding or misunderstanding, and awareness for canceling the setting, and even if an operator with little experience operates and sets the injection molding machine, various troubles can occur. It is an object of the present invention to provide a control device for an injection molding machine that can be prevented.

The control device of the injection molding machine of the present invention includes a storage unit that stores information about the molding conditions of the injection molding machine, and a control unit that issues a warning by referring to the information about the molding conditions stored in the storage unit. Be prepared.
The storage unit in the present invention stores the resin-molding standard correspondence information in which the resin material to be molded and the molding reference value that is a reference for generating a warning determined for the resin material are associated with each other, and the control unit is a control unit. When the resin material to be molded is specified, the measured value actually measured by the injection molding machine, the set value set as the molding condition, and the resin material specified from the resin-molding standard correspondence information. It is characterized in that a warning is issued based on the comparison result with the molding reference value of.

In the control device of the present invention, when the measured value is the actual stop time of the screw provided in the injection molding machine and the molding reference value is the reference stop time of the screw for the resin material, the control unit performs injection. While the heater for heating the plastic cylinder of the molding machine is turned on and the screw is stopped, a warning is issued based on the comparison result between the measured stop time and the reference stop time of the screw. Can emit.

When this control unit identifies that the resin material to be molded is one of a predetermined amorphous resin, strong corrosive resin, and low thermal stability resin, the actual stop time and screw are measured. A warning can be issued based on the comparison result with the reference stop time of.

In the control device of the present invention, when the measured value is the position measured by the actual measurement of the screw provided in the injection molding machine and the molding reference value is the reference retracted position of the screw for the resin material, the control unit performs injection molding. While the heater for heating the plastic cylinder of the machine is turned on and the screw is stopped, a warning is issued based on the result of comparison between the actual measured screw position and the reference retracted position of the screw. Can emit.

When this control unit identifies that the resin material to be molded is a predetermined resin with high thermal stability, it warns based on the result of comparison between the measured position and the reference retracted position of the screw. Can be emitted.

In the control device of the present invention, the set value is the set temperature of the plasticized cylinder provided in the injection molding machine, the measured value is the measured temperature of the plasticized cylinder, and the molding reference value is the plasticization of the resin material. When it is the reference temperature of the cylinder, the control unit can issue a warning based on the comparison result between one or both of the set temperature and the measured temperature of the plasticized cylinder and the reference temperature of the plasticized cylinder.

When this control unit identifies that the resin material to be molded is a resin having a predetermined short molding cycle, the control unit determines one or both of the set temperature and the measured temperature of the plastic cylinder and the reference of the plastic cylinder. A warning can be issued based on the comparison result with the temperature.

By the way, in general, a plurality of heaters are provided in a plastic cylinder along the longitudinal direction, and each heater has an independent set temperature, or each heater group in which a plurality of heaters are combined is independent. The temperature is controlled. The set temperature at this time may be the same value for all the heaters or all the heater groups, or may be a different value for each heater or each heater group. When there are a plurality of set temperatures in this way, all the set temperatures may be compared with the reference temperature of the plastic cylinder, or some set temperatures may be used. Further, the reference temperature of the plastic cylinder may be provided for each heater or each heater group, and the set temperature and the reference temperature may be compared for each heater or each heater group.
Further, the corresponding heaters are compared with each other, or the corresponding heater groups are compared with each other. Whether or not it corresponds is specified based on the position of the thermoplastic cylinder in which the heater or the heater group is provided.

In the control device of the present invention, when the set value is the set rotation speed of the screw provided in the injection molding machine and the molding reference value is the reference rotation speed of the screw for the resin material, the control unit is the screw. A warning can be issued based on the result of comparison between the set rotation speed and the reference rotation speed of the screw.

When this control unit identifies that the resin material to be molded is a resin having a predetermined high viscosity, it is based on the comparison result between the set rotation speed of the screw and the reference rotation speed of the screw. Can issue a warning.

In the control device of the present invention, the set values are the subsequent molding temperature set for the subsequent resin to be molded, the preceding molding temperature in which the preceding resin to be molded immediately before was molded, and The set molding temperature difference, which is the difference between , When the molding reference value is the permissible molding temperature difference set corresponding to the preceding resin and the succeeding resin, the control unit determines the set molding temperature difference or the measurement result of the comparison between the measured molding temperature difference and the permissible molding temperature difference. Based on, you can issue a warning.

As described above, the temperature is controlled and set or set at an independent set temperature for each heater or at an independent set temperature for each heater group in which a plurality of heaters are combined. When there are a plurality of molding temperatures, the difference may be obtained at all molding temperatures or at some molding temperatures.
Further, the corresponding heaters are compared with each other, or the corresponding heater groups are compared with each other. Whether or not it corresponds is specified based on the position of the thermoplastic cylinder in which the heater or the heater group is provided.

In the control device of the present invention, the control unit can also specify the resin material based on the molding conditions set in the control unit, including at least the temperature of the plastic cylinder or the rotation speed of the screw.

The present invention provides an injection molding machine including a molding machine main body including a mold clamping unit and a plasticization unit, and any of the above-mentioned control devices for controlling the operation of the molding machine main body.

According to the present invention, injection is performed after the injection molding machine is stopped due to some trouble during automatic operation, or automatically according to the production plan or due to a temporary defect in molding, or after the operator has stopped the injection molding machine. When the operator operates or sets to restart the operation of the molding machine, it warns that this operation or setting may cause trouble. Therefore, according to the control device of the injection molding machine of the present invention, it is possible to provide the operator with an awareness for canceling an inappropriate operation due to a belief or misunderstanding. As a result, even if an operator with little experience operates the injection molding machine, various troubles can be prevented.

It is a figure which shows the schematic structure of the injection molding machine which concerns on embodiment of this invention. This is mold-molding condition correspondence information stored in the storage unit of the present embodiment. Information stored in the storage unit of the present embodiment is shown, (a) is the first molding reference information, and (b) is the second molding reference information. It is a flowchart which shows the warning generation procedure by mode A of this embodiment. It is a flowchart which shows the warning generation procedure by mode B of this embodiment. It is a flowchart which shows the warning generation procedure by mode C of this embodiment. It is a flowchart which shows the warning generation procedure by mode D of this embodiment. It is a flowchart which shows the warning generation procedure by mode E of this embodiment.

Hereinafter, the present invention will be described in detail based on the embodiments shown in the accompanying drawings.
The injection molding machine 1 in the present embodiment includes a molding machine main body 10 and a control device 20 for controlling the operation of the molding machine main body 10.
Although this embodiment will be described using an injection molding machine 1 driven by a hydraulic actuator (hydraulic mechanism), an electric motor such as a servomotor, an inverter motor, or an IPM (Interior Permanent Magnet) motor is used instead of the hydraulic actuator. There is no problem even if the injection molding machine 1 to which the electric actuator is applied.

[Molding machine body 10]
As shown in FIG. 1, the molding machine main body 10 includes a mold clamping unit 11 and a plasticizing unit 15.
The mold clamping unit 11 includes a fixed die plate 12 to which a fixed mold (not shown) is attached, and a movable die plate 13 to which a movable mold (not shown) is attached. The mold clamping unit 11 is provided with a hydraulic mechanism for moving the movable die plate 13 toward the fixed die plate 12, and the movable die plate 13 is moved to hit the fixed mold prior to injection molding. Make contact. Further, the pressure of the hydraulic oil of the hydraulic mechanism is increased, the movable mold and the fixed mold are tightened, and after the mold is tightened, the cavity formed between the movable mold and the fixed mold is plasticized. A molded product is obtained by injecting molten resin from the unit 15.

As shown in FIG. 1, the plasticization unit 15 includes a plasticization cylinder 16 having a discharge nozzle formed on the front side, which is the side of the mold clamping unit 11, and a screw 17 provided inside the plasticization cylinder 16. A raw material hopper 18 for supplying a resin material to the inside of the plastic cylinder 16 is provided. The plasticizing unit 15 also includes a drive source for moving the screw 17 forward or backward, a drive source for rotating the screw 17 in the forward or reverse direction, and the like, which are not shown. Further, the plastic cylinder 16 is provided with a heating heater 19 on the outer periphery thereof, and the heating heater 19 heats the inside of the plastic cylinder 16 at an adjusted temperature while the power is turned on.
The screw 17 includes a tip side 17A and a base portion 17B, and the base portion 17B is arranged on the side of the raw material hopper 18.

In the plasticization unit 15, when the screw 17 is rotated, for example, a pellet-shaped thermoplastic resin supplied from the raw material hopper 18 is conveyed to the front side of the plasticization cylinder 16. In this transport process, the resin pellets are gradually heated and melted and stored in front of the screw 17. In response to the pressure of the resin generated by the storage, the screw 17 retracts to the side of the raw material hopper 18 and conveys and weighs a predetermined amount of the molten resin in front of the screw 17. After that, the weighed molten resin is injected and filled into the cavity formed between the fixed mold and the movable mold of the mold clamping unit 11 by a predetermined amount from the discharge nozzle.

In order to obtain a molded product using the injection molding machine 1 having the above elements, the following steps are sequentially executed. That is, a molding step of closing the movable mold and the fixed mold and molding at high pressure, a plasticizing step of heating and melting the resin pellets inside the plasticizing cylinder 16 to make them plastic, and plasticized melting. An injection process in which the resin is injected and filled into the cavity formed by the movable mold and the fixed mold, a cooling process in which the molten resin filled in the cavity is cooled until it solidifies, and a mold opening that opens the mold. A molded product is obtained through a step and a take-out step of taking out the molded product that has been cooled and solidified in the cavity.

The molding machine main body 10 is provided with various sensors in the mold clamping unit 11 and the plasticization unit 15, and the sensing information actually measured by the sensors during the execution of each of the above steps is the control device 20. Will be sent to. The sensing information includes, for example, mold clamping pressure, injection pressure, and the like. In this embodiment, the position of the screw 17 and the temperature of the plastic cylinder 16 are measured.

[Control device 20]
As shown in FIG. 1, the control device 20 uses the sensing information sent from the molding machine main body 10 or the information provided in advance in the control device 20 to allow the molding machine main body 10 to perform a molding step, a plasticizing step, and the like. The operation command information is generated so as to perform the operation required for each process of the injection process. The control device 20 transmits the generated operation command information to each drive unit of the molding machine main body 10. This is the basic operation of the control device 20. Each drive unit of the molding machine main body 10 executes an operation necessary for performing injection molding based on the received operation command information.

Further, as a characteristic matter of the present embodiment, the control device 20 compares the reference value stored corresponding to the resin material to be molded with the measured value or the set value, and is abnormally molded in the current state. Issue a warning if there is a risk of this happening.
The injection molding machine 1 automatically executes the above-mentioned process based on the injection molding conditions set in the control device 20 by the operator, but the injection molding machine is automatically stopped or automatically stopped due to some trouble during the automatic operation. The operation of the screw 17 may be stopped or the operator may manually set the operating conditions according to the production plan or due to a temporary defect in molding, either automatically or by instructing the control device 20 by the operator. be. When the screw 17 is stopped by these, the control device 20 can be used for determining to measure the stop time and issue a warning.

The control device 20 includes a control unit 21, a determination unit 22, a first storage unit 23, and a second storage unit 24. The control device 20 is composed of a computer device, and includes an input device 25 composed of soft keys or hard keys, and a display device 26 such as an LCD (Liquid Crystal Display). Further, the control device 20 operates the first switch 27 that turns on / off the power of the control device 20 on the input device 25, the second switch 28 that turns on / off the power of the molding machine main body 10, and the molding machine main body 10. A third switch 29 for turning on / off the above is provided.

The control unit 21 reads various information stored in the first storage unit 23 according to instructions and selections from the operator, generates operation command information, and generates the generated operation command information in each of the molding machine main bodies 10. It transmits to the drive unit. Further, the control unit 21 generates warning information based on the result of the determination by the determination unit 22, and causes the display device 26 to display the generated warning information.

The determination unit 22 determines the sensing information (measured value) from the molding machine main body 10 or the conditions set in the molding machine main body 10 and the reference value predetermined for each resin material stored in the second storage unit 24. Is compared and determined, and the result is transmitted to the control unit 21.

In the first storage unit 23, a fixed mold attached to the fixed die plate 12 of the molding machine main body 10, a movable mold attached to the movable die plate 13, molding conditions, and a resin material to be molded are associated with each other. It will be remembered. In the present embodiment, this associated information is referred to as mold-molding condition correspondence information.

Usually, a user who manufactures a resin molded product using an injection molding machine 1 possesses a plurality of types of dies corresponding to each molded product. Then, when the mold is specified, the molding conditions and the resin material used in the injection molding machine 1 are uniquely determined. Therefore, the injection molding machine 1 stores the mold-molding condition correspondence information in the first storage unit 23, reads out the molding condition when the mold is specified in the control device 20, and the control unit 21 reads out. The operation of the molding machine main body 10 is controlled based on the molding conditions.

[Mold-molding condition correspondence information]
FIG. 2 shows an example of mold-molding condition correspondence information.
The mold-molding condition correspondence information is associated with a mold ID given to each mold, a molding condition, and a resin name. In addition, only a part of the molding conditions is shown, and includes mold dimensions, plasticization conditions, and injection molding conditions. For example, the mold size corresponding to the mold having the mold ID # 1 is α1, the plasticizing condition is β1, the injection condition is γ1, and the resin molded by this mold is ABC. The molding conditions and resin names are fictitious.
In addition, the mold-molding condition correspondence information also associates the category of the resin to be molded. This category includes whether or not the resin is amorphous, whether or not it is highly corrosive, whether or not it has low thermal stability, whether or not it has high thermal stability, and whether it is molded in a high cycle. It is classified according to whether or not it corresponds to a high-viscosity resin. In modes A, B, C and D, which will be described later, this resin category is referred to. Note that FIG. 2 omits the description of the factors of whether or not it has strong corrosiveness and whether or not it has low thermal stability.

When the mold ID, for example, # 1 is input from the input device 25, the control device 20 causes the control unit 21 to correspond to the molds of the first storage unit 23 to # 1 (mold dimensions: α1, Plasticization condition: β1, injection condition: γ1 ...) and the resin name are read out. The control unit 21 controls the operation of the molding machine main body 10 based on the read information.

[Judgment criteria (resin-molding criteria correspondence information)]
Next, the second storage unit 24 stores the resin-molding standard correspondence information that is the basis of the determination performed by the determination unit 22.
This information includes the first molding reference information shown in FIG. 3 (a) and the second molding reference information shown in FIG. 3 (b). The first molding reference information is associated with a specific resin name and a plurality of molding reference information, and the second molding reference information is for two resin materials to be molded one after the other. Information on the difference between the combination and the reference molding temperature is associated with each other.

The first reference information will be described with reference to FIG. 3A.
The first reference information is associated with the name of the resin to be molded, the screw reference stop time as the molding reference value, the screw reference retract position, the screw reference rotation speed, and the cylinder reference temperature.

The screw reference stop time (ST1 to S-Tn) means an allowable upper limit time from when the operation of the screw 17 provided inside the plastic cylinder 16 is stopped to when the operation is restarted. The screw reference stop time is compared with the time STd at which the screw 17 is stopped. This stop time S-Td is an actually measured value.
This comparison is made when the resin material to be molded is either an amorphous resin, a corrosive resin, or a resin having low thermal stability. Further, this comparison shows that the resin material to be molded may be deteriorated by retention, discolored yellow, or volatilized by a strongly corrosive gas, or that the resin material melted in the screw 17 particularly at the base 17B is transferred to the screw 17. This is done to warn and inform the operator that wrapping may occur.

Next, the screw reference retracted positions (SP1 to S-Pn) define the positions where the screw 17 should be retracted between the time when the operation of the screw 17 is stopped and the time when the operation is restarted. Is. The screw reference retreat position is compared with the position SPd where the screw 17 is actually stopped. This position S-Pd is an actually measured value.
This comparison is made when the resin material to be molded has high thermal stability. Further, this comparison is performed to warn the operator that the resin material melted at the base 17B of the screw 17 may be wrapped around the screw 17.

Next, the screw reference rotation speed (S-R1 to S-Rn) defines the upper limit of the allowable rotation speed of the screw 17 for each resin material. The screw reference rotation speed is compared with the rotation speed (SRs) of the screw 17, which is a set value manually set by the operator.
This comparison is made when the resin material to be molded has a high viscosity. Further, in this comparison, the set rotation speed is too high, and the rotation torque of the screw 17 required for plasticizing the resin material is insufficient, so that the resin cannot be rotated or the resin is subjected to excessive shear heat generation due to the high rotation speed. This is done to prevent thermal deterioration of the material.

Next, the cylinder reference temperature (C-T1 to C-Tn) defines the lower limit temperature in the cylinder required at the time of molding. The cylinder reference temperature is set with one or both of all or part of the temperature of the plasticized cylinder (C-Ts) and the measured temperature of the plasticized cylinder (C-Tm), which are set values set by the operator's setting operation. Will be compared.

Generally, the plastic cylinder is provided with a plurality of heaters along the longitudinal direction, and the temperature is set independently for each heater, or independently for each heater group in which a plurality of heaters are combined. The temperature is controlled. The set temperature at this time may be the same value for all the heaters or all the heater groups, or may be a different value for each heater or each heater group. When there are a plurality of set temperatures in this way, all the set temperatures may be compared with the reference temperature of the plastic cylinder, or some set temperatures may be used. Further, the reference temperature of the plastic cylinder may be provided for each heater or each heater group, and the set temperature and the reference temperature may be compared for each heater or each heater group.
This comparison is made when the resin material to which high cycle molding is performed is the molding target. Further, in this comparison, the operator is informed that the screw 17 may cause snarling wear (adhesive wear) when rotating and sliding with the plastic cylinder 16 because the temperature of the set plastic cylinder is low. It is done to warn and convey.
It should be noted that the corresponding heaters are compared with each other, or the corresponding heater groups are compared with each other. Whether or not it corresponds is specified based on the position of the thermoplastic cylinder 16 in which the heater or the heater group is provided.

Next, the second reference information will be described with reference to FIG. 3 (b).
The second reference information is allowed according to the combination of the resin name (preceding resin material) previously subjected to molding in the injection molding machine 1 and the resin material (subsequent resin material) to be molded thereafter. The difference in molding temperature (ΔT1 to ΔTn) is specified.
As described above, when there are a plurality of set temperatures of the same value or a set temperature of a plurality of different values corresponding to each heater or each heater group, the combination of the preceding resin material and the succeeding resin material is supported. The difference in the allowable molding temperature may be the temperature difference in the molding temperature of all the heaters or the temperature difference in the molding temperature of some heaters. Further, the difference in molding temperature allowed according to the combination of the preceding resin material and the succeeding resin material may be provided for each heater or each heater group, and the comparison may be performed for each heater or each heater group. ..

[Warning procedure]
The control device 20 includes five warning generation modes, modes A to E. After explaining the gist of each warning generation mode, the specific procedure of each mode will be described with reference to FIGS. 4 to 8. As a premise, it is assumed that the control unit 21 reads out the molding conditions and the resin name from the first storage unit 23 by inputting the mold ID to be used for the control device 20 by the operator.

[Overview of Mode A to Mode E]
Mode A is an amorphous resin, a strongly corrosive resin, a resin that easily yellows due to thermal deterioration and poor thermal stability, typically PC (polycarbonate), PMMA (Polymethylcrylicyl). : Polymethylmethacrylate resin), which is a resin used for optically molded products and has a high degree of transparency, or flame-retardant ABS (Acrylonitrile, Butadiene, Styrene) Flame-retardant resin such as copolymer synthetic resin) and flame-retardant PP (polypropylene) and strongly corrosive resin such as PTFE (Poly Tetra Fluoro Ethylene) and PVC (Poly Vinyl Chloride) Applies to the case of. When molding these resins, do not impair the transparency, or use flame retardants (particularly brominated flame retardants, chlorine flame retardants, phosphorus flame retardants, boron flame retardants, nitrogen flame retardants) and fluorine. It is required that the screw 17 and the plasticized cylinder 16 are not corroded by the strongly corrosive gas due to the thermal decomposition of the based resin and the vinyl chloride based resin. Whether or not each resin corresponds to an amorphous resin, a resin having poor thermal stability, or a resin having strong corrosiveness can be specified by referring to the mold-molding condition correspondence information as shown in FIG. ..

In mode A, when the power of the heater 19 is turned on, the execution time during which the screw 17 is not rotating, that is, the stop time which is the measured value of the screw 17 and the screw reference stop time (FIG. 3A). It is done by comparison of. However, this is exempted when the cold start prevention function of the screw 17 is operating or the stop temperature maintenance function is operating immediately after the power of the heater 19 is turned on. The same applies to mode B.

The cold start prevention function is a screw breakage that occurs when the screw is rotated in a state where the resin material in the screw 17 is not sufficiently softened before the temperature of the plastic cylinder 16 reaches the molding temperature. This means a function of prohibiting the rotation of the screw 17 until the resin material in the screw 17 is sufficiently softened.
Further, the stop temperature maintaining function is to maintain the temperature of the plastic cylinder 16 at a temperature lower than the molding temperature in order to prevent the resin material in the screw 17 from being thermally deteriorated while the injection molding machine 1 is stopped. It means the function to control.

Mode A prevents the resin material in the screw 17 from staying and deteriorating, discoloring yellow, or volatilizing a strongly corrosive gas, and also prevents the resin from wrapping around the screw 17, especially the base 17B. The purpose.

Mode B is formed into a predetermined resin with high thermal stability, typically an olefin resin such as PP or PE (Polyethylene), or a styrene resin such as PS (polystyrene). Applies. Whether or not each resin corresponds to a resin having high thermal stability can be specified by referring to the mold-molding condition correspondence information as shown in FIG.
In mode B, when the power of the heater 19 is turned on, the stop time as the measured value of the screw 17 and the reference stop time of the screw (FIG. 3A) are compared, and the measured value of the screw 17 is compared. It is performed by comparing the position as and the screw reference retracted position.

The mode B, like the mode A, is intended to prevent the resin material from wrapping around the screw 17 particularly to the base 17B. However, while the resin material into which mode A is molded is particularly targeted for amorphous resins, resins with poor thermal stability, and resins with strong corrosiveness, mode B has good thermal stability and is in a high temperature environment. Target resins that require less monitoring of exposure time. That is, the mode B is intended to prevent wrapping even when left for a long time due to the easy-to-handle screw position, instead of monitoring at a time that the operator must always pay attention to.

Mode C is applied to a resin material to be molded, which is a target of high cycle molding having a short molding cycle, typically a resin such as PP, PE, or PS. Whether or not each resin corresponds to the target of high cycle molding can be specified by referring to the mold-molding condition correspondence information shown in FIG.
Mode C is performed by comparing the set temperature by the operator setting operation of the plastic cylinder 16 with the cylinder reference temperature (FIG. 3A).
The purpose of the mode C is to prevent the screw 17 from causing roaring wear (adhesive wear) when the screw 17 rotates and slides with the plastic cylinder 16 when the set temperature is set to a low temperature by the operator's setting operation. It is done in.
The shape of the screw 17 is designed according to the degree to which the resin material changes from the solid phase to the liquid phase in the screw 17 at the time of plasticization, but the degree (or speed) of the phase change of the resin material from the solid phase to the liquid phase. Is greatly affected by the amount of heat transferred from the thermoplastic cylinder 16 to the resin material in the screw 17. That is, if the set temperature of the plastic cylinder 16 is low, the amount of heat supplied to the resin material in the screw 17 becomes scarce, so that the phase change of the resin material is delayed and the residual solid phase increases. When this residual solid phase increases excessively, it bites into the compressed portion of the screw 17 groove in a wedge shape to greatly eccentricize the screw 17 and strongly press it against the inner circumference of the plastic cylinder 16. If the screw 17 rotates in this state, whispering wear (adhesive wear) occurs. Mode C is performed for the purpose of preventing whirling wear of the screw 17 caused by the low temperature setting by the setting operation of the operator.

Mode D is a high-viscosity engineering plastic resin in which the plasticization torque of the resin material to be molded is high, typically PC, PMMA, ABS, PTFE, PET (Polyethyleneterephthalate), PEI (Poly Ether Imide). : Polyetherimide), PEEK (Poly Ether Ether Ketone), PVC and other resins. Whether or not each resin corresponds to a high-viscosity resin can be specified by referring to the mold-molding condition correspondence information as shown in FIG.
Mode D is performed by comparing the set rotation speed of the screw 17 set by the operator's setting operation with the screw reference rotation speed (FIG. 3A).
The mode D is performed for the purpose of avoiding the thermal deterioration of the resin material due to the non-rotatable state of the screw 17 due to insufficient plasticizing torque or the excessive shearing heat generation due to the high rotation speed.

Mode E is the temperature of the molding temperature (successor molding temperature) of the resin material (successor resin) to be molded and the molding temperature (preceding molding temperature) of the resin material (preceding resin) molded immediately before the succeeding resin. This is done by comparing the difference with the allowable molding temperature difference (FIG. 3 (b)).
The purpose of the mode E is to prevent the screw 17 from being worn out in advance due to the low temperature setting due to the large difference in the molding temperature of the resin materials to be molded one after the other.

[Procedure of mode A]
The procedure of mode A will be described with reference to FIG. This procedure is executed by the control unit 21 with reference to various information stored in the first storage unit 23 and the second storage unit 24. The same applies to modes B to E.
The control unit 21 identifies the resin material to be molded from the mold-molding condition correspondence information (FIG. 2) read based on the operator's instruction (FIG. 4, S101).

The control unit 21 determines whether or not the specified resin material corresponds to an amorphous resin, whether or not it is a strongly corrosive resin, or whether or not it is a resin having low thermal stability (FIG. 4 S103). In S103 of FIG. 4, the description of the strongly corrosive resin or the resin having low thermal stability is omitted.
If the specified resin material is any of an amorphous resin, a resin having low thermal stability, and a strongly corrosive resin (FIG. 4 S103 Yes), the control unit 21 then turns on the power supply of the heater 19. It is confirmed whether or not it is turned on (FIG. 4, S105).
When the control unit 21 confirms that the power of the heater 19 is turned on (FIG. 4 S105 Yes), the control unit 21 confirms whether or not the screw 17 is stopped (FIG. 4 S107).

When the control unit 21 confirms that the screw 17 is stopped (FIG. 4 S107 Yes), the magnitude of the stop time S-Td and the screw reference stop time S-Tn, which are the elapsed times since the screw 17 is stopped, is large or small. The relationships are compared (FIG. 4 S109). Although the screw reference stop time S-Tn is illustrated here, the screw reference stop times S-T1 to S-Tn corresponding to the name of the resin to be molded are actually selected. Further, the time count of the stop time S-Td may be started, for example, when the operator switches from the automatic operation mode of the injection molding machine 1 to the manual operation mode, or the rotation of the screw 17 is automatically the last in the automatic operation mode. It may be when it stops at. Further, the time count may be started at the time when the rotation of the screw 17 is finally stopped by the operation of the operator in the manual operation mode. The same applies to mode B and later. In this case, the screw reference stop time S-T1 to S-Tn is preferably about 1 hour or less, more preferably 30 minutes or less, although it depends on the type of resin. In addition, especially in the case of resins such as optically molded products, in which fine yellow discoloration due to thermal deterioration or oxidative deterioration greatly affects quality evaluation, or resins containing a large amount of strongly corrosive components, this screw standard stop time is 20 minutes or less. preferable.
If the control unit 21 determines that the stop time S-Td as the measured value is equal to or greater than the screw reference stop time S-Tn (FIG. 4 S109 Yes), the control unit 21 issues a warning (FIG. 4 S111).
As long as the screw 17 continues to stop (FIG. 4 S109 No, S107Yes), the control unit 21 compares the magnitude relationship between S-Td and S-Tn (FIG. 4 S109) and determines that S-Td is S-Tn or higher. If so (FIG. 4 S109 Yes), a warning is issued (FIG. 4 S111).

If no warning is issued in mode A (FIG. 4, S103 No, S105 No, S107 No), the process proceeds to the determination of mode B.

[Effect of mode A]
Mode A is a resin material for operators, especially for amorphous resins that are prone to wrapping, resins with poor thermal stability that are prone to yellow discoloration due to thermal deterioration, or resins that generate strongly corrosive gas by thermal decomposition. Warns that there is a risk of retention deterioration, yellow discoloration, volatilization of strongly corrosive gas, or wrapping.
Here, wrapping is a phenomenon in which the molten resin hardens and sticks in the groove of the screw 17, and when wrapping occurs, the opening area for transporting the resin in the groove decreases, and the friction of the wrapped resin increases. Being larger than metal reduces the ability to transport the resin. Further, if the wound resin stays as it is and deteriorates, a part of the wound resin may be peeled off and contained in the molding resin. Since the peeled resin is deteriorated due to retention, the molded product is colored in dots. Therefore, wrapping is a phenomenon that should be particularly avoided for amorphous resins.

There are several causes of wrapping, but this embodiment assumes that the injection molding machine is stopped due to some trouble during automatic operation, or according to the production plan or due to a temporary defect in molding. Or when the operator shuts down the injection molding machine.

Even if the operation of the screw 17 is stopped, the power supply of the heater 19 is often left on. Therefore, when the operation of the screw 17 is stopped, the temperature of the resin material already supplied to the inside of the plastic cylinder 16 rises and melts. During the operation of the screw 17, the resin material is supplied and the supplied resin material is conveyed forward. Therefore, the resin material is not melted only by raising the temperature by the heating heater 19, but the screw 17 is operated. When the operation is stopped for a long time, the resin material stagnant in the groove of the screw 17 is excessively melted. Specifically, during the operation of the screw 17, even the resin material which is not melted and remains in a solid phase melts in the groove and adheres to the inside of the groove (groove bottom, groove side wall). After that, when the operation of the screw 17 is restarted, at the base 17B of the screw 17 where new low-temperature resin materials are supplied one after another, the temperature of the resin material that has stayed and melted until then and adhered to the groove. Will solidify and stick to the bottom of the groove or the side surface of the groove, and even if the screw 17 is rotated, the resin material will rotate together with the screw 17, and will not be conveyed inside the screw 17 as it is. There is a risk of staying, the so-called wrapping phenomenon.

On the other hand, in the injection molding machine 1 of the present embodiment, by adopting the mode A, there is a possibility that the resin material is stagnant and deteriorated, yellow discoloration or strong corrosive gas is volatilized, and the base 17B of the screw 17 is used. Warn the operator that wrapping may occur. If the operator who receives the warning restarts the operation of the screw 17 before the resin material is stagnant deterioration, yellow discoloration or strong corrosive gas volatilization or wrapping, the resin material is stagnant deterioration, yellow discoloration or strong corrosive gas. Volatilization and wrapping can be avoided.

[Procedure for mode B]
The procedure of mode B will be described with reference to FIG.
The control unit 21 determines whether or not the specified resin material has excellent thermal stability (FIG. 5S201).
If the specified resin material is a resin material having excellent thermal stability (FIG. 5 S201 Yes), the control unit 21 then confirms whether or not the power of the heater 19 is turned on (FIG. 5 S203). ).
When the control unit 21 confirms that the power of the heater 19 is turned on (FIG. 5 S203 Yes), the control unit 21 confirms whether or not the screw 17 is stopped (FIG. 5 S205).

When the control unit 21 confirms that the screw 17 is stopped (FIG. 4 S205 Yes), the control unit 21 compares the magnitude relationship between the stop time S-Td after the screw 17 is stopped and the screw reference stop time S-Tn. (FIG. 5 S207).
If the control unit 21 determines that the stop time S-Td is equal to or greater than the screw reference stop time S-Tn (FIG. 5 S207 Yes), then the measured positions S-Pd of the screw 17 and the reference position of the screw 17 are used. The magnitude relationship of S-Pn is compared (FIG. 5 S209).
If the control unit 21 determines that the retracted position of the screw 17 has not reached the reference position S-Pn, that is, the position S-Pd is equal to or less than the reference position S-Pn of the screw 17 (FIG. 5 S209 Yes), the control unit 21 issues a warning. Emit (FIG. 5 S211). In this case, the screw reference stop time S-T1 to S-Tn is preferably about 2 hours or less, more preferably 1 hour or less, although it depends on the type of resin.

As long as the screw 17 continues to be stopped (FIG. 5 S209 No, S205 Yes), the control unit 21 compares the magnitude relationship between S-Td and S-Tn (FIG. 5 S207), and the magnitude relationship between S-Pd and S-Pn. (FIG. 5 S209) is continuously performed, and a warning is issued based on the comparison result (FIG. 5 S211).

If no warning is issued in mode B (FIG. 5, S201 No, S203 No, S205 No, S207 No), the process proceeds to the determination of mode C.

[Effect of mode B]
Since mode B targets a resin material having high thermal stability, unlike mode A, there is no need to worry about thermal deterioration. However, if the screw 17 is stopped for a long time, wrapping may occur at its base 17B. Therefore, to the extent that the base portion 17B of the screw 17, specifically, the base portion 17B, which is a screw groove region in which the resin material does not melt and remains in a solid phase during the operation of the screw 17, deviates from the high temperature region of the plastic cylinder 16. By retracting the screw 17, the operator is warned in advance that the base 17B will be wrapped. At this time, the high temperature region of the plastic cylinder 16 means, for example, a region where the temperature near the inner wall of the plastic cylinder 16 is equal to or higher than the softening temperature of the resin material or higher than the flow start temperature. In particular, when the resin material is a crystalline resin, it is preferable to retract the base 17B to the extent that it deviates from the region above the melting point, and when the resin material is an amorphous resin, the base 17B is set to 60 from the glass transition point. It is preferable to retreat to the extent that it deviates from the region higher than ° C.
Although the plasticized cylinder 16 is provided with a heating heater 19, the heating heater 19 is not provided around the raw material hopper 18 or on the rear side thereof (on the right side in FIG. 1). Therefore, the temperature of the plastic cylinder 16 decreases as the distance from the region where the heater 19 is provided toward the region where the heater 19 is not provided (right side in FIG. 1).
In mode B, the temperature of the plastic cylinder 16 is also low so that the resin material in the groove does not melt even if the screw 17 is not operated for a long time, so that the base 17B in which the resin material is not melted during the operation of the screw 17 does not melt. It is intended to evacuate to the area.

When the resin material is a crystalline resin, the reference position S-Pn should be a value that is at least twice the screw diameter, that is, a position where the screw 17 is retracted from the most advanced position by a distance of at least twice the screw diameter. Preferably, when the resin material is an amorphous resin, the value is preferably 3 times or more the screw diameter. This is the temperature of the inner wall surface of the plastic cylinder 16 at the position corresponding to the base 17B when the screw 17 is retracted to about twice the screw diameter, the melting temperature in the crystalline resin, and the glass transition point in the amorphous resin. This is because the amount of retreat is such that the temperature can be retreated to a position sufficient to lower the temperature by 60 ° C. higher than that.

[Procedure of mode C]
The procedure of mode C will be described with reference to FIG.
The control unit 21 determines whether or not the specified resin material corresponds to the high cycle resin (FIG. 6 S301).
If the specified resin material is a resin material superior to the high cycle resin (FIG. 6 S301 Yes), the control unit 21 then confirms whether or not the power of the heater 19 is turned on (FIG. 5 S303). ).

When the control unit 21 confirms that the power of the heater 19 is turned on (FIG. 6 S303 Yes), the control unit 21 confirms whether or not the screw 17 is stopped (FIG. 6 S305).
When the control unit 21 confirms that the screw 17 is stopped (FIG. 6 S305 Yes), the control unit 21 confirms whether or not the operator has performed the rotation operation of the screw 17 (FIG. 6 S306).
When the control unit 21 confirms that the operator has rotated the screw 17 (FIG. 6 S306 Yes), the control unit 21 keeps the screw 17 stopped and the set temperature C-Ts of the plasticized cylinder 16 and the cylinder reference temperature C-Tn. (Fig. 6 S309). This comparison is preferably performed with the rotation of the screw 17 stopped. However, even if the set temperature C-Ts of the plastic cylinder 16 is lower than the cylinder reference temperature C-Tn, it is unlikely that the screw 17 will be worn immediately after the rotation of the screw 17, so that the set temperature is set. The comparison between C-Ts and the cylinder reference temperature C-Tn may be performed after the rotation of the screw 17 is started.
If the set temperature C-Ts is equal to or lower than the cylinder reference temperature C-Tn corresponding to the resin material to be molded (FIG. 6 S309 Yes), the control unit 21 issues a warning without starting the rotation of the screw. Emit (Fig. 6 S311). At this time, if the comparison between the set temperature C-Ts and the cylinder reference temperature C-Tn is performed with the screw 17 stopped, a warning may be given with the screw 17 stopped, or the screw 17 may rotate. You may give a warning after starting. Further, when the comparison between the set temperature C-Ts and the cylinder reference temperature C-Tn is performed after the rotation of the screw 17 is started, a warning may be given while rotating the screw 17, or the rotation of the screw 17 may be performed. You may give a warning after stopping.
At this time, when the resin material is a crystalline resin, the cylinder reference temperature C-Tn is preferably a temperature 20 ° C. or higher higher than the melting temperature, and more preferably 30 ° C. or higher. When the resin material is an amorphous resin, the temperature is preferably 80 ° C. or higher higher than the glass transition temperature, and more preferably 100 ° C. or higher.

The control unit 21 continuously compares the magnitude relationship between C-Ts and C-Tn (FIG. 6 S309 No), and continuously issues a warning if C-Ts is a value lower than C-Tn. (FIG. 6 S311).

[Effect of mode C]
Mode C warns that the screw 17 may be worn out when it is rotationally slid with the plastic cylinder 16 due to the breakup of the solid bed.
The user of the injection molding machine 1 may keep in mind that the molding cycle is shortened to improve the production efficiency of the injection molded product. In order to shorten the molding cycle and achieve high cycle molding, it is effective to keep the molding temperature, that is, the set temperature of the plastic cylinder 16 as low as possible, and shorten the time until the resin solidifies. In addition, the shrinkage of the resin material that occurs when the molten resin cools and solidifies in the mold increases as the temperature of the molten resin increases, so in order to reduce the distortion and residual stress of the molded product that occurs during the solidification process. It is effective to keep the temperature of the molten resin as low as possible. In this case, it is effective to keep the set temperature of the plastic cylinder 16 having a large influence on the molten resin temperature as low as possible. Therefore, the operator tries to set the set temperature C—Ts low when setting the temperature of the plastic cylinder 16. However, when the molding temperature is low, a break-up phenomenon is likely to occur during plasticification in the groove of the screw 17. When a breakup occurs, an eccentric load is generated in the circumferential direction of the screw 17, and the screw 17 tends to be gnawed by the plastic cylinder 16.

Therefore, by adopting the mode C, the injection molding machine 1 adopts the mode C, so that if the set temperature C-Ts is equal to or lower than the cylinder reference temperature C-Tn, the set temperature C-Ts of the plastic cylinder 16 is lower than that of the operator. Warns that the screw 17 may bite into the plastic cylinder 16.
Upon receiving this warning, the operator can reset the set temperature C-Ts of the plastic cylinder 16 to prevent the screw 17 from being worn out due to the low set temperature.

[Procedure for mode D]
The procedure of mode D will be described with reference to FIG. 7.
The control unit 21 determines whether or not the specified resin material corresponds to a high-viscosity resin (FIG. 7 S401).
If the specified resin material is a high-viscosity resin (FIG. 7 S401 Yes), the control unit 21 then confirms whether or not the power of the heater 19 is turned on (FIG. 7 S403). ..
When the control unit 21 confirms that the power of the heater 19 is turned on (FIG. 7 S403 Yes), the control unit 21 confirms whether or not the screw 17 is stopped (FIG. 7 S405).
When the control unit 21 confirms that the screw 17 is stopped (FIG. 7 S405 Yes), the control unit 21 confirms whether or not the rotation speed of the screw 17 is set by the operator's operation (FIG. 7 S407).

When the control unit 21 confirms that the rotation speed of the screw 17 is set (FIG. 7 S407 Yes), the control unit 21 confirms whether or not the operator has performed the rotation operation of the screw 17 (FIG. 7 S409).
When the control unit 21 confirms that the operator has performed the rotation operation of the screw 17 (FIG. 7 S409 Yes), the rotation speed S-Rs of the screw 17 and the reference rotation speed of the screw 17 set while the screw 17 is stopped are set. S-Rn is compared (FIG. 7 S411). This comparison is preferably performed with the screw 17 stopped. However, even if the rotation speed S-Rs of the screw 17 is higher than the reference rotation speed S-Rn of the screw 17, the non-rotatable state of the screw 17 or the thermal deterioration of the resin material occurs immediately after the rotation of the screw 17. Therefore, the comparison between the rotation speed S-Rs of the screw 17 and the reference rotation speed S-Rn of the screw 17 may be performed after the rotation of the screw 17 is started.

If the set rotation speed S-Rs is equal to or higher than the reference rotation speed S-Rn (FIG. 7 S411 Yes), the control unit 21 issues a warning (FIG. 6 S413).
At this time, if the comparison between the rotation speed S-Rs of the screw 17 and the reference rotation speed S-Rn of the screw 17 is performed while the screw 17 is stopped, a warning may be given while the screw 17 is stopped. , You may do it after starting the rotation of the screw 17. When the comparison between the rotation speed S-Rs of the screw 17 and the reference rotation speed S-Rn of the screw 17 is performed after the screw 17 is rotated, the screw 17 may be rotated while the screw 17 is rotated. You may go after stopping.

The control unit 21 continuously compares the magnitude relationship between R-Rs and S-Rn (FIG. 7 S405) as long as the operator continues to rotate the screw 17 in the manual mode of the screw 17 (FIG. 7 S409 Yes). , Issue a warning as needed (Fig. 7 S413).

[Effect of mode D]
Mode D is applied to high viscosity resins. When injection molding a high-viscosity resin, the rotation speed of the screw 17 is kept low in order to secure torque. On the contrary, if the screw 17 is rotated at a high rotation speed, that is, if the rotation speed of the electric motor that is the driving source of the screw 17 is increased, the torque generated by the electric motor becomes insufficient, and in an extreme case, the screw 17 is generated. Occurs that does not rotate.
Further, in the high-viscosity resin, when the screw 17 is rotated at a high rotation speed, excessive shearing heat may be generated to cause thermal deterioration.

However, since the injection molding machine 1 is provided with mode D, the operator can know in advance the situation where the screw 17 does not rotate due to insufficient torque or the occurrence of thermal deterioration of the resin material due to excessive shear heat generation, so that the set rotation speed can be set. By resetting the S-Rs, it is possible to prevent the screw 17 from being in a non-rotatable state or the resin material from being thermally deteriorated.

[Procedure for mode E]
The procedure of mode E will be described with reference to FIG.
The control unit 21 reads out the information of the resin material (preceding resin) formed immediately before from the first storage unit 23 (FIG. 8 S501). This information includes the name of the preceding resin (preceding resin name) and the molding temperature (preceding molding temperature: C-TB). The control unit 21 has already received the name of the succeeding resin (successor resin name) and the molding temperature (successor molding temperature: C-TA) from the first storage unit 23 as information on the resin material (successor resin) to be molded. I'm reading. At this time, the control unit 21 is not the information of the resin material (preceding resin) molded immediately before reading the preforming temperature C-TB from the first storage unit 23, but the plasticization measured by the temperature sensor (not shown). The temperature of the cylinder 16 may be set as the preforming temperature C-TB.

The control unit 21 collates the combination of the preceding resin name and the succeeding resin name with the second reference information (FIG. 3B) stored in the second storage unit 24, and the allowable molding temperature difference (ΔT1 to ΔTn). (Fig. 8 S503). In FIG. 3B, for example, if the preceding resin name is “ABG” and the succeeding resin name is “ABH”, the allowable molding temperature difference ΔTn is specified. At this time, the allowable molding temperature difference ΔTn is preferably selected for each resin material, but for example, the allowable molding temperature difference ΔTn is set to a constant temperature value of about 10 to 30 ° C. regardless of the correlation between the preceding resin name and the succeeding resin name. May be good.

When the control unit 21 specifies the allowable molding temperature difference ΔTn, the control unit 21 determines that the difference between the preceding molding temperature C-TB and the succeeding molding temperature C-TA (set molding temperature difference = | (C-TB)-(C-TA) |). The allowable molding temperature difference ΔTn is compared (FIG. 8 S505).
If the difference between C-TB and C-TA (| (C-TB)-(C-TA) |) is equal to or greater than the allowable molding temperature difference ΔTn (FIG. 8 S503 Yes), the control unit 21 issues a warning (FIG. 8 S503 Yes). FIG. 8 S505).
If the difference between C-TB and C-TA (| (C-TB)-(C-TA) |) is less than the allowable molding temperature difference ΔTn (FIG. 8 S503 No), the control unit 21 issues a warning. Finish the process without.

[Effect of mode E]
Mode E can cope with the whispering wear of the screw 17 due to breakup when the difference between the pre-molding temperature and the subsequent molding temperature is large. As a premise of mode E, a considerable amount of the previously molded resin remains inside the plastic cylinder 16. When the subsequent molding temperature is significantly lower than the pre-molding temperature, breakup or plasticity occurs when the resin remaining inside is cooled due to the low subsequent molding temperature and the viscosity or solidification progresses. The screw 17 is likely to be in a non-rotatable state due to insufficient torque. Further, when the pre-molding temperature is significantly higher than the subsequent molding temperature, the leading resin is likely to melt at the base 17B of the screw 17 and cause wrapping.

First, a case where the pre-molding temperature is high and the subsequent molding temperature is low (case X) will be described.
If a resin having a high molding temperature remains inside the plasticizing cylinder 16 and a resin having a low molding temperature is to be molded, and the molding temperature is set for the resin having a low molding temperature as usual, the subsequent molding temperature is low. As a result, the remaining resin having a high molding temperature may be cooled to increase its viscosity or solidify. In this case, the amount of heat transfer (temperature difference from the material resin in the screw 17) required to be supplied from the thermoplastic cylinder 16 as the amount of heat for softening or melting the highly viscous or solidified resin is insufficient. do. In this case, the low temperature is set to a temperature lower than the temperature required for discharging the preceding resin actually remaining in the screw 17 to the outside of the plastic cylinder 16 (or screw 17) while being melted. , Excessive breakup may occur.
At this time, in order to soften or melt the resin remaining in the screw 17 and having a high viscosity or solidification, the shearing force (plasticization torque) from the screw 17 is sufficient to compensate for the insufficient amount of heat transfer from the plastic cylinder 16. ) Need to be given. For this reason, the required thermoplastic torque increases, and there is a risk that the screw 17 cannot rotate due to insufficient thermoplastic torque, or thermal deterioration occurs due to excessive shear heat generation of the resin material.

Next, a case where the pre-molding temperature is low and the subsequent molding temperature is high (case Y) will be described.
It is assumed that an attempt is made to mold a succeeding resin having a high molding temperature while a resin having a molding temperature lower than that of the succeeding resin remains inside the plasticizing cylinder 16, and a high molding temperature of the succeeding resin is set as usual. In this case, the residual leading resin having a low molding temperature melts in the groove and melts in the groove (groove bottom) in the base portion 17B which is not melted and remains in a solid phase if operated at the leading molding temperature. , Groove side wall). After that, when the succeeding resin is charged and the operation of the screw 17 is restarted, for example, the succeeding resin in the pellet state (low temperature state) is supplied one after another, and the temperature of the base 17B is lowered. As a result, the leading resin that has melted at the base 17B and adhered to the inside of the groove may solidify and stick to the bottom of the groove or the side surface of the groove, causing wrapping.

However, since the injection molding machine 1 is provided with mode E, if the difference between the pre-molding temperature and the subsequent molding temperature is large, a warning is issued to the operator so that the injection molding machine 1 will be molded inside the plastic cylinder 16 from now on. Notify that there is a possibility that a resin having a large difference in molding temperature from the resin to be used remains.
Upon receiving this warning, the operator instructs the molding machine main body 10 to discharge the previously molded resin from the plastic cylinder 16, and the shear wear due to the large molding temperature difference. , Insufficient plasticizing torque, thermal deterioration of resin material due to excessive shear heat generation, and wrapping can be prevented.

[Effect of Embodiment]
As described above, according to the injection molding machine 1 of the present embodiment including modes A to E, when the operator operates or sets the control device 20, this operation or setting may cause trouble. Warn that there is. Therefore, the injection molding machine 1 can provide the operator with an awareness for canceling an inappropriate operation due to a belief or misunderstanding. As a result, even if an operator with little experience operates the injection molding machine 1, various troubles can be prevented.

Although the preferred embodiments of the present invention have been described above, the configurations listed in the above embodiments can be selected or appropriately changed to other configurations as long as the gist of the present invention is not deviated.
For example, the warning is not limited to being visually displayed on the display device 26, and the operator can give a warning that can be audibly recognized, such as emitting a voice. It is also possible to express a warning by tactile sensation like vibration. Furthermore, the content of the warning is also arbitrary, for example, text / voice with the content such as "There is a possibility that a problem may occur in mode A", or "If you continue to stop the screw any longer, wrapping may occur". It can be a character / voice with the content such as.
Further, when an erroneous warning is issued based on an erroneous signal such as a failure of a sensor or a storage device, the warning may be canceled by performing a predetermined operation. Further, it is preferable that the cancellation can be canceled only by a qualified owner who is managed by a user ID, a password, or the like and has been given a cancellation qualification in advance.

Further, although the case where the screw is stopped by the operation of the operator in the present embodiment is illustrated, the stop of the screw in the present invention is not limited to this. The injection molding machine is stopped for a long time before or after the start or end of the automatic operation, that is, the injection molding machine 1 is not performing the molding operation by the automatic operation and exceeds the time required for one molding cycle during the continuous automatic operation. Can include states. That is, not only when the screw is rotated at least, the screw is switched to the manual mode by the operation of the operator and the rotation of the screw is stopped, but also due to some trouble during the automatic operation or according to the production plan, the instruction from the control device. This also applies to the case where the rotation of the screw is stopped when the operation of the injection molding machine 1 is automatically stopped.

Further, in the present embodiment, the information on the resin material is exemplified as the information associated with the unique name of the resin, but this is only an example.
Instead of a unique name, it may be information associated with a resin group having similar structural properties of a resin such as an amorphous resin or a crystalline resin, or it may be softening temperature, flow start temperature, melting temperature, glass transition temperature, heat. It may be information associated with a resin group in which the temperature at which the characteristics of the resin material such as the decomposition temperature are displaced is close and is included in a predetermined temperature range.
Further, the information may be associated with a resin group whose molding temperature is similar and included in a predetermined temperature range, or may be information associated with a resin group whose molten resin viscosity is approximated and included in a predetermined viscosity range.
Further, the information may be used as information associated with a resin group in which the required calorific value for melting the resin material is approximated and included in a predetermined range, or used for molded products such as optical molded products, miscellaneous goods, and automobile parts. The information may be associated with each resin group for each or similar molded article application group.
Further, the information may be associated with the contained additive, each reinforcing material or similar additive, and each resin group for each reinforcing material group, and in addition to these, it is associated with all resin groups that classify resins. It can be information.
Further, these categories may be used as information associated with each subdivided complex category by combining a plurality of categories instead of individually.

Further, in the present embodiment, the resin material is specified by the control device reading the molding conditions and the resin name corresponding to the mold ID from the storage device as the information in which the information of the resin material is associated with the mold. As shown, the resin material may be specified by the operator directly inputting from the input device.

Further, the resin material may be specified based on the molding conditions including at least the set temperature of the plastic cylinder or the rotation speed of the screw set in the control device. In this case, a representative resin material is stored in the storage unit in association with the set temperature of the plurality of plastic cylinders or the combination of the rotation speeds of the screws. At this time, it is preferable to store in the storage unit in correspondence with the resin material not as a specific temperature but as a temperature range or a rotation speed range. For example, an olefin resin is associated as a resin material with respect to a combination of a range in which the set temperature of the plastic cylinder is 250 ° C. or less and a screw rotation speed range in which the screw rotation speed is set to 80% or more of the mechanical specification value. Remember. At this time, if the set temperature of the plastic cylinder is 230 ° C. and the screw rotation speed is 90%, the resin material is specified as an olefin resin.

In order to improve the accuracy of identifying the resin material, it is preferable to store the resin material in the storage unit by associating the resin material with the combination of the set temperature of the plastic cylinder and the rotation speed of the screw.
However, as the molding temperature range of thermoplastic resins such as PP, PE, and PS, it is common to mold in the lower limit temperature range or in the upper limit rotation speed range of the specification rotation speed range of the injection molding machine. In the case of a certain resin material, it can be considered that the resin material can be specified only from the set temperature of the plasticized cylinder or only the rotation speed of the screw. Therefore, resin materials such as PP and PE may be stored in association with only the set temperature of the plastic cylinder or only the rotation speed of the screw.

Further, it is preferable that the resin material to be stored in the storage unit and the resin-molding reference value such as the molding reference value can be created or edited by the operator and stored in the storage unit.

Further, although the molding reference information is provided with a preset default value, the operator can edit the default value and change it to his / her own molding reference information.

1 Injection molding machine 10 Molding machine body 11 Molding unit 12 Fixed die plate 13 Movable die plate 15 Plasticization unit 16 Plasticization cylinder 17 Screw 17A Tip 17B Base 18 Raw material hopper 19 Heater 20 Control device 21 Control unit 22 Judgment unit 23 1st storage unit 24 2nd storage unit 25 Input device 26 Display device 27 1st switch 28 2nd switch 29 3rd switch

Claims (12)

A storage unit that stores information about the molding conditions of the injection molding machine,
A control unit that issues a warning by referring to the information regarding the molding conditions stored in the storage unit is provided.
The storage unit
The resin-molding standard correspondence information in which the resin material to be molded and the molding reference value that is the reference for generating a warning determined for the resin material are associated with each other is stored.
The control unit
When the resin material to be molded is specified, it is specified from the measured value actually measured by the injection molding machine, the set value set as the molding condition, and the resin-molding standard correspondence information. and the forming the reference value for the resin material, based on a result of comparison, and emitting the warning,
The measured value is
This is the actual stop time of the screw provided in the injection molding machine.
The molding reference value is
This is the reference stop time of the screw for the resin material.
The control unit
While the heater for heating the plastic cylinder included in the injection molding machine is turned on and the screw is stopped,
The warning is issued based on the result of comparison between the measured stop time and the reference stop time of the screw.
A control device for an injection molding machine.
The control unit
When it is specified that the resin material to be molded is any of an amorphous resin, a strongly corrosive resin, and a low thermal stability resin stored in advance in the control unit,
Based on the comparison of the reference stop time of the screw and the downtime before Symbol measured emits the warning,
The control device for an injection molding machine according to claim 1.
A storage unit that stores information about the molding conditions of the injection molding machine,
A control unit that issues a warning by referring to the information regarding the molding conditions stored in the storage unit is provided.
The storage unit
The resin-molding standard correspondence information in which the resin material to be molded and the molding reference value that is the reference for generating a warning determined for the resin material are associated with each other is stored.
The control unit
When the resin material to be molded is specified, it is specified from the measured value actually measured by the injection molding machine, the set value set as the molding condition, and the resin-molding standard correspondence information. and the forming the reference value for the resin material, based on a result of comparison, and emitting the warning,
The measured value is
This is the actual measured position of the screw provided in the injection molding machine.
The molding reference value is
This is the reference retreat position of the screw for the resin material.
The control unit
While the heater for heating the plastic cylinder included in the injection molding machine is turned on and the screw is stopped,
The warning is issued based on the result of comparison between the position of the screw and the reference retracted position of the screw by the actual measurement.
A control device for an injection molding machine.
The control unit
When it is specified that the resin material to be molded is a resin having high thermal stability stored in advance in the storage unit,
The warning is issued based on the result of comparison between the measured position and the reference retracted position of the screw.
The control device for an injection molding machine according to claim 3.
A storage unit that stores information about the molding conditions of the injection molding machine,
A control unit that issues a warning by referring to the information regarding the molding conditions stored in the storage unit is provided.
The storage unit
The resin-molding standard correspondence information in which the resin material to be molded and the molding reference value that is the reference for generating a warning determined for the resin material are associated with each other is stored.
The control unit
When the resin material to be molded is specified, it is specified from the measured value actually measured by the injection molding machine, the set value set as the molding condition, and the resin-molding standard correspondence information. and the forming the reference value for the resin material, based on a result of comparison, and emitting the warning,
The set value is
This is the set temperature of the plastic cylinder provided in the injection molding machine.
The measured value is
It is the measured temperature of the plastic cylinder.
The molding reference value is
This is the reference temperature of the plastic cylinder for the resin material.
The control unit
One or both of the set temperature and the measured temperature of the plastic cylinder and the plasticized cylinder
The warning is issued based on the comparison result of the temperature with the reference temperature.
A control device for an injection molding machine.
The control unit
When it is specified that the resin material to be molded is a resin having a short molding cycle stored in advance in the control unit,
The warning is issued based on the result of comparison between the set temperature of the plastic cylinder and one or both of the measured temperatures and the reference temperature of the plastic cylinder.
The control device for an injection molding machine according to claim 5.
A storage unit that stores information about the molding conditions of the injection molding machine,
A control unit that issues a warning by referring to the information regarding the molding conditions stored in the storage unit is provided.
The storage unit
The resin-molding standard correspondence information in which the resin material to be molded and the molding reference value that is the reference for generating a warning determined for the resin material are associated with each other is stored.
The control unit
When the resin material to be molded is specified, it is specified from the measured value actually measured by the injection molding machine, the set value set as the molding condition, and the resin-molding standard correspondence information. and the forming the reference value for the resin material, based on a result of comparison, and emitting the warning,
The set value is
It is the set rotation speed of the screw provided in the injection molding machine.
The molding reference value is
This is the reference rotation speed of the screw for the resin material.
The control unit
Based on the result of comparison between the set rotation speed of the screw and the reference rotation speed of the screw.
Issue the warning,
A control device for an injection molding machine.
The control unit
When it is specified that the resin material to be molded is a highly viscous resin stored in advance in the control unit,
Based on the comparison result between the reference rotational speed of the the setting rotational speed before Symbol screw screw emits the warning,
The control device for an injection molding machine according to claim 7.
The set value is
It is the set molding temperature difference, which is the difference between the subsequent molding temperature set for the subsequent resin to be molded and the preceding molding temperature at which the preceding resin to be molded immediately before was molded. ,
The measured value is
It is a measurement molding temperature difference which is a difference between the subsequent molding temperature and the measurement temperature of the plastic cylinder controlled by the control unit based on the preceding molding temperature.
The molding reference value is
It is an allowable molding temperature difference set corresponding to the preceding resin and the succeeding resin.
The control unit
The warning is issued based on the result of comparison between the set molding temperature difference or the measured molding temperature difference and the allowable molding temperature difference.
The control device for an injection molding machine according to claim 1.
Wherein,
Set before Symbol controller, and the molding conditions related to the rotation speed of the temperature or the screw of the plasticizing cylinder,
The resin material is specified based on the information stored in the storage unit in which the set temperature range of the plastic cylinder or the rotation speed range of the screw is associated with the resin material.
The control device for an injection molding machine according to any one of claims 1 to 9.
The measured value is a measured value actually measured while the rotation of the screw is stopped.
The control device for an injection molding machine according to any one of claims 1, 2, 3, 4, and 9.
A molding machine body equipped with a mold clamping unit and a plasticizing unit,
The control device according to any one of claims 1 to 11, which controls the operation of the molding machine main body.
An injection molding machine characterized by being equipped with.

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