JP2007261031A - Mold clamping device of vertical injection molding machine and mold clamping force adjustment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold clamping device which can apply the same mold clamping force to each lower mold and keep the mold clamping force to correspond to a change with the passage of time during molding when a plurality of lower molds with working errors in mold thickness are set to carry out molding in a toggle mode vertical rotary type or slide type injection molding machine and a mold clamping force adjustment method. <P>SOLUTION: The mold clamping device is equipped with a tie-bar sensor 19 detecting the mold clamping force, a mold distinction sensor 52, and a controller 75 which calculates the deviation of the mold clamping force from the values detected by the tie-bar sensor 19 and corrects/controls the mold clamping force automatically based on the calculation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a toggle type mold clamping device and a method for adjusting a mold clamping force of the mold clamping device in a vertical injection molding machine.

In a vertical injection molding machine, for example, a table having a circular shape is rotatably arranged, and a plurality of lower molds mounted on the table and an upper mold mounted so as to be able to advance and retreat above the frame Are opposed to each other. And, by rotating the table, the lower mold takes a mold clamping position for clamping and a setup position for taking out a molded product or setting an insert product (see, for example, Patent Document 1).

FIG. 9 is a front view of a toggle type vertical rotary injection molding machine disclosed in Patent Document 1. FIG.
A vertical rotary injection molding machine and a molding sequence using the injection molding machine will be briefly described with reference to FIG.

A rotary table (hereinafter simply referred to as a table) 113 that is rotatable as a lower platen is disposed on the upper surface of a machine frame (hereinafter simply referred to as a frame) 111.
The upper platen 114 and the table 11 can be moved forward and backward above the table 113.
A toggle support 115 is disposed so as to be able to advance and retreat below 3 by a plurality of (only two shown) tie bars 116 penetrating the frame 111.

The upper end portion of the tie bar 116 is fastened and fixed to the upper platen 114 with a fixing nut, and the lower end portion of the tie bar 116 is connected to the toggle support 115 via an adjustment nut (not shown) so as to be able to advance and retract. The adjusting nut is held by the toggle support 115 via a mold thickness adjusting mechanism (not shown) and a transmission mechanism (not shown).

Lower molds 125 are attached to the upper surface of the table 113 at two locations in the circumferential direction.
By rotating 13, each lower mold 125 is alternately clamped position S1 and set-up position S.
2 is taken. Therefore, a motor 151 for rotating the table 113 is attached to a predetermined position of the frame 111, and the motor 151 and the table 113 are connected by a transmission mechanism (not shown) including gears and the like.

Accordingly, the table 113 is rotated by driving the motor 151, and the lower mold 1
25 is selectively placed at the mold clamping position S1 and the setup position S2. An upper mold 126 is attached to the lower surface of the upper platen 114 so as to face the lower mold 125 placed at the mold clamping position S1. The lower mold 125 and the upper mold 126 constitute a mold apparatus.

By moving the upper platen 114 back and forth, the upper mold 126 and the lower mold 125 can be brought into contact with and separated from each other, and the mold apparatus can be closed, clamped, and opened.
Therefore, a mold clamping device 131 is provided.

The mold clamping device 131 includes a toggle mechanism 132, a mold clamping motor 161, a transmission mechanism 163,
And a ball screw shaft 170 that converts the rotational motion into a linear motion and transmits the linear motion to the toggle mechanism 132.

In the case of a toggle type mold clamping device, the mold clamping force is adjusted by fully closing the mold devices 125 and 126 and then continuing the mold clamping to extend the tie bar 116. This is done by adjusting. That is, the force that the extended tie bar 116 returns to becomes the mold clamping force, so that a large mold clamping force is obtained when the elongation amount is large, and a small mold clamping force is obtained when the elongation amount is small. It will be.

Normally, the extension amount of the tie bar 116 is adjusted by changing the stop position of the toggle support 115 that is the origin of the toggle mechanism 132 to an appropriate position without changing the fully extended position of the toggle mechanism 132, or vice versa. The stop position of the toggle support 115 is not changed, and the toggle mechanism 1
This may be done by changing the extended position of 32, that is, the forward limit position of the crosshead.

Next, the operation of the vertical rotary injection molding machine having the above configuration will be described.
First, the motor 151 is driven to rotate the table 113, one lower mold 125 is placed in the mold clamping position S1, the other lower mold 125 is placed in the setup position S2, and then the mold clamping motor 161 is installed. By driving, the toggle mechanism 132 is operated, and the toggle support 115 is moved backward (lowered in the figure) to advance the upper platen 114 (lowered in the figure) to perform mold closing.

During this time, in the setup position S2, the molded product molded in the previous molding process is used as the other lower mold 12.
5 or set an insert to be used in the next molding process. For this reason, although not shown, an ejection device, an insertion device for an insert product, and the like are provided.

In the mold apparatus in which mold clamping is performed, molten resin is injected and filled into the mold from an injection apparatus (not shown), and when cooling of the filled resin is completed, the mold clamping motor 161 is driven to perform a toggle mechanism. 132 is operated to move the toggle support 115 forward (in the drawing), the upper platen 114 is moved back (in the drawing) to open the mold.

Subsequently, the motor 151 is driven to rotate the table 113, and one lower mold 125 is placed in the setup position S2, and the other lower mold 125 is placed in the mold clamping position S1. Thereafter, the same process is repeated.

JP 2002-001757 A

The above-described vertical rotary type injection molding machine molds with a plurality of lower molds mounted on a table. However, it is extremely difficult to process the mold thickness dimensions of the plurality of lower molds completely in most cases. The difference will occur.

In the case of a toggle type mold clamping device, when the lower molds having different mold thickness dimensions are clamped, the amount of tie bar elongation at the time of mold clamping is different, and this amount of elongation is about to return. Therefore, there will be a difference in the clamping force generated by

When the mold clamping force is insufficient for molding, the mold mating surface opens due to the resin filling pressure, and burrs are generated in the molded product. When the mold clamping force is excessive, the mold cavity The molded product malfunctions such as the gas escape is poor and the molded product is burned.

When a new mold is attached, the optimum mold clamping condition (toggle support stop position, etc.) for one lower mold can be set for the other lower mold as a whole. When high quality is required, optimum conditions are set for each lower mold.In either case, the toggle support position and the actual mold clamping force are kept within a certain allowable range. The crosshead position was moved slightly and the mold clamping operation was repeated.

Once the setting is completed, even if the mold clamping force changes due to changes in the amount of tie bar due to the thermal expansion of the mold due to mold temperature control, the molded product will be defective. Until it occurred, the necessity of correcting the clamping conditions could not be recognized.

The present invention solves the problem of mold clamping force adjustment in these conventional toggle type vertical rotary type or slide type injection molding machines so that the same mold clamping force continues to act on each lower mold. By detecting the actual clamping force of each lower mold for each clamping cycle, the difference between the actual clamping force and the set clamping force is calculated, and the calculation is performed based on that value to automatically correct the clamping force. It is an object of the present invention to provide a toggle type vertical injection molding machine capable of doing this.

Therefore, in the vertical injection molding machine according to the present invention, the mold is obtained by moving the upper platen up and down via the mold clamping mechanism with respect to the frame, the table arranged to be rotatable or slidable with respect to the frame. A mold clamping device that performs mold closing, mold clamping and mold opening, an upper mold mounted on the upper platen, and a plurality of lower molds mounted on a table and paired with the upper mold and capable of being clamped respectively. A tie bar sensor for detecting a mold clamping force is disposed in a tie bar portion of a mold clamping device. The mold device is composed of a mold device, an injection device disposed on an upper surface of an upper platen, and a control device for controlling them. In addition, a mold discriminating sensor for discriminating a plurality of individual lower molds is provided.

The control device includes a setting unit, a storage unit that stores basic conditions and new basic conditions, a calculation unit that calculates a correction value based on detection values from the tie bar sensor and the mold discrimination sensor, and a control unit. did.

Also, a mold clamping force adjustment method for a vertical injection molding machine having the above-described configuration, wherein the stop position of the toggle support is automatically set based on the actual detected value of the mold clamping force detected during the mold clamping process. Adjusted to keep the clamping force at the set value.

As another adjustment method, the forward limit position of the crosshead is automatically adjusted based on the actual detected value of the mold clamping force detected during the mold clamping process to keep the mold clamping force at the set value.

Absolute value of the difference between the actual clamping force and the set clamping force with respect to the basic conditions of the clamping force, and the tie bar sensor that detects the clamping force, the die discrimination sensor that discriminates the individual lower die on the table By having a control device that automatically calculates and corrects the correction value according to the above, even when the mold thickness dimension of the lower mold differs from the plurality of lower molds at the molding preparation stage when the mold is replaced The mold clamping force can be automatically adjusted so that the same mold clamping force can be applied, and the adjustment work is accurate and the adjustment time can be greatly shortened.

During the molding process, it is possible to automatically compensate for changes in the clamping force caused by the thermal expansion of the mold due to mold temperature control, greatly reducing the cost by improving the quality of the molded product and eliminating defective products. Became possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view of a vertical rotary injection molding machine embodying the present invention, FIG. 2 is a plan view of the same mold clamping device, and FIG. 3 is a block diagram showing the configuration and control flow of the control device 75 of FIG. 4 is a sequence step diagram of a molding preparation stage in which the present invention and other examples are implemented, FIG. 5 is a sequence step diagram of a mold clamping force correction process A in which the present invention is implemented, and FIG. 6 is a molding process stage in which the present invention is implemented. FIG. 7 is a sequence step diagram of mold clamping force correction processing B in which another example is implemented,
FIG. 8 is a sequence step diagram of a molding process stage in which another example is implemented.

1, 2, and 3, a table 13 having a circular shape that functions as a lower platen is rotatably disposed on the upper surface of the frame 11. An upper platen 14 and a toggle support 15 that are movable forward and backward below the table 13 so as to freely advance and retract above the table 13 and extend below and above the table 13 extend vertically through the frame 11. A plurality of (for example, three) tie bars 16 are connected and arranged.

A tie bar sensor 19 is disposed on one of the tie bars 16. The tie bar sensor 19 is a sensor that detects the amount of extension (distortion) of the tie bar 16.
5 can know the clamping force actually applied.

The upper end portion of the tie bar 16 is fastened and fixed to the upper platen 14 with a fixing nut 17, and the lower end portion of the tie bar 16 is screwed into a tie bar screw portion 18 formed on the outer periphery of the lower end portion, and is covered on one end of the outer periphery. A toggle support 15 is disposed so as to be able to advance and retract through an adjusting nut 46 formed with a driving gear. The adjustment nut 46 is held at the lower end of the toggle support 15 so as to be rotatable and immovable in the axial direction of the tie bar 16.

A mold thickness adjusting device 41 disposed on the toggle support 15 is disposed on a servo motor 42 having a position sensor 43 of the toggle support 15 as an encoder for detecting the rotation speed of the motor, and an output shaft of the servo motor 42. And a transmission mechanism 45 that connects the drive gear 44 and a driven gear formed at one end of the outer periphery of the adjustment nut 46. As a result, the servo motor 42 can be rotated in a predetermined direction by a predetermined number of rotations, and the toggle support 15 can be advanced and retracted by a predetermined distance.

On the upper surface of the table 13, lower molds 25 are attached at two locations in the circumferential direction. By rotating the table 13, the lower molds 25 are alternately set in a region surrounded by the tie bars 16. It is possible to selectively take the mold clamping position S1 and the setup position S2 set outside the region.

Therefore, a motor 51 for rotating the table 13 is disposed at a predetermined position of the frame 11,
The motor 51 and the table 13 are connected to each other by a transmission mechanism (not shown) including gears and the like.

Further, a mold discrimination sensor 52 for discriminating whether the lower mold is one of the lower molds or the other lower mold is attached to a predetermined position of the frame 11.

On the lower surface of the upper platen 14, the upper mold 26 is opposed to the lower mold 25 placed at the mold clamping position S1.
Is attached, and the lower mold 25 and the upper mold 26 constitute a mold apparatus. And
By moving the upper platen 14 back and forth, the upper mold 26 and the lower mold 25 are brought into contact with and separated from each other, and the mold apparatus can be closed, clamped, and opened.

For this purpose, a mold clamping device 31 is provided. The mold clamping device 31 is generated by moving the toggle support 15 forward and backward and generating a mold clamping force, a mold clamping servo motor 61 for operating the toggle mechanism 32, and driving the servo motor 61. A transmission mechanism 63 that transmits the rotated rotation, and a ball screw shaft 70 as a motion conversion means that receives the rotation transmitted through the transmission mechanism 63 and converts the rotational motion into a linear motion and transmits it to the toggle mechanism 32. Arranged.

The servo motor 61 for mold clamping has a mold opening / closing position sensor 62 as an encoder for detecting the rotation speed of the motor. Accordingly, the servo motor 61 can be rotated in a predetermined direction by a predetermined number of rotations so that the crosshead 36 can be advanced and retracted by a predetermined distance.

The toggle mechanism 32 is a toggle arm 3 that is swingably disposed with respect to the upper surface plate of the frame 11.
3, a toggle lever 34 that is swingably disposed with respect to the toggle support 15 and is swingably connected to the toggle arm 33, and a toggle lever 3 at an intermediate portion of the toggle lever 34.
4 includes a toggle lever 35 that is swingably disposed with respect to 4, and a cross head 36 that is swingably coupled to the toggle lever 35.

The transmission mechanism 63 includes a drive pulley 66 disposed on the output shaft 65 of the servomotor 61, a driven pulley 67 disposed rotatably with respect to the frame 11, and a drive pulley 66 and a driven pulley 67. It comprises a timing belt 68 stretched between them.

The upper end of the ball screw shaft 70 is connected to the cross head 36 so as to be rotatable and non-movable in the axial direction, and a ball nut 69 attached to the toggle support 15 is fixed to the middle portion of the ball screw portion. It is screwed.

Detection signals output from the tie bar sensor 19, the toggle support position sensor 43, and the mold opening / closing position sensor 62 are sent to the control device 75.

The control device 75 includes a setting unit 77, a new basic condition storage unit 78 obtained by adding or subtracting the correction value calculated by the basic condition and calculation unit 76 to the basic condition, and the detected actual mold clamping force. The calculation unit 76 calculates a correction value based on the absolute value of the difference between the value and the set clamping force value, and the control unit 79 controls the servo motor 42 or the servo motor 61 based on these conditions.

FIG. 4 is a sequence step diagram of the molding preparation stage in which the present invention and another example are implemented.
When the upper mold 26 and the two lower molds 25 are attached to the molding machine, and the necessary clamping force of the mold is set in the setting unit 77 of the control device 75, the toggle support 1 stored in the storage unit 78 in advance.
5 and the basic conditions at the time of mold clamping force adjustment such as the stop position of the cross head 36 and the mold opening stroke are read and set, and the mold clamping force adjustment sequence starts.

The stop position of the toggle support 15, the stop position of the crosshead 36, the mold opening stroke, and the like are related to the mold clamping force corresponding to the thickness dimension of the attached mold and the extension amount of the tie bar 16 (hereinafter referred to as mold clamping). (It is called force relational expression).

The servomotor 61 for clamping is driven to move the toggle of the toggle mechanism 32 and the folding toggle support 15 is moved upward to open the space between the upper mold 26 and the lower mold 25 to a set dimension. When adjusting the mold clamping force, the set dimension between the two molds is obtained by adding a slight allowance to the mold opening (mold closing) stroke (the upper mold 26 and the lower mold even if the mold is closed in this state) 25 is not touched and is open by a slight margin).

The table rotating motor 51 is driven to rotate the table 13, and one lower mold 25 is moved to S.
The one lower mold 25 is moved to S1 by the mold discrimination sensor 52.
In the process of forming the other lower mold 25 while confirming that it is in the position (step S2), the motor 51 is driven to move the other lower mold 25 to the S1 position (step S9). .

The servomotor 61 for mold clamping is driven to extend the toggle of the toggle mechanism 32 and the toggle support 15 is moved backward (moved downward in the figure), and the upper platen 14 is moved in the mold closing direction by the mold closing stroke (the mold touch is (Step S3).

Next, the mold is opened by the amount of extension of the tie bar 16 corresponding to the set mold clamping force according to the basic conditions stored in the storage unit 78 based on the mold clamping force relational expression (step S4).
In this state, the mold thickness adjusting device 41 is driven and the toggle support 15 is retracted until the mold is touched to fully close the mold (step S5).

Thereafter, a mold clamping force correction process A (when the present invention is implemented) or a mold clamping force correction process B (when another example is implemented) is performed (step S6), and the mold clamping of one lower mold 25 is performed. The force is the set clamping force. After the correction process A or the correction process B is completed, the servo motor 61 is driven, and the upper platen 14 is opened until the mold is opened (step S7).

Here, it is confirmed whether the mold clamping force adjustment of both the lower molds 25 has been completed, and if completed, the molding preparation stage is completed, and if not completed, the process proceeds to step S2 and the sequence from step S3 is performed. Repeatedly, the mold clamping force adjustment of the lower molds 25 is completed.

FIG. 5 is a sequence step diagram of the mold clamping force correction process A according to the present invention.
In this state, the servo motor 61 is driven to fold the toggle mechanism 32 so that the upper platen 14
Is opened to the mold opening limit (step S15). Next, the toggle mechanism 32 is extended to fully close the mold, and the mold clamping is continued to complete the mold clamping (pressure increase) (step S16).

Here, the actual mold clamping force is detected by the tie bar sensor 19 disposed on the tie bar 16 (step S17). The absolute value of the difference between the detected actual clamping force value and the set value is calculated by the calculation unit 76 (
If the absolute value of this difference is within the set threshold range, the basic condition is not corrected (step S19).

If the absolute value of the difference is outside the range of the threshold value, the upper platen 14 is opened to the mold opening limit (step S20), and then the servo motor 42 is driven to obtain the correction value obtained from the mold clamping force relational expression. The toggle support 15 is moved forward or backward (the distance between the crosshead 36 and the toggle support 15 with the toggle mechanism 32 fully extended is not changed, and the table 13 and the toggle support 15 are not changed.
And the correction value is added to or subtracted from the original basic condition to replace it as a new basic condition for the lower mold 25 (step S21), and the process proceeds to step 16 to set the clamping force. Repeat automatic adjustment until

FIG. 6 is a sequence step diagram of the molding process stage in which the present invention is implemented. The table 13 is rotated by driving the table rotation motor 51 to move one lower mold 25 to the S1 position, and the other lower mold 25 is moved to the S2 position to form the molded product in the previous step. Or insert an insert to be used in the next process (step S25).

Next, the mold discriminating sensor 52 confirms that one lower mold 25 is in the S1 position (step S26). In the process of molding the other lower mold, the motor 51 is driven to The lower mold 25 is moved to the S1 position (step S27).

The mold is closed and clamped according to the basic condition or the new basic condition (step S28), and when the mold clamping is completed, the actual mold clamping force is detected by the tie bar sensor 19 (step S29). The absolute value of the difference between the detected actual value of the clamping force and the set value is calculated by the calculation unit 76 (step S30), and the basic condition is corrected if the absolute value of this difference is within the set threshold value range. No (step S31).

If it is outside the threshold range, the current molding process is continued without interruption, and the correction value is calculated based on the clamping force relational expression, and added or subtracted from the basic condition to replace it as the new basic condition in the next process. (Step S32).

Thereafter, molten resin is injected and filled from an injection device (not shown) (step S33), and after completion of cooling of the filled resin, the mold is opened to the mold opening limit (step S34). It is confirmed whether or not the molding with both lower molds 25 is completed, and if the molding is completed (step S35), the molding process is completed, and the same cycle is continued thereafter. To proceed to the sequence step.

FIG. 7 is a sequence step diagram of mold clamping force correction processing B in which another example is implemented.
In this state, the servo motor 61 is driven to fold the toggle mechanism 32 so that the upper platen 14
Is opened to the mold opening limit (step S40). Next, the toggle mechanism 32 is extended to fully close the mold, and the mold clamping is continued to complete the mold clamping (pressure increase) (step S41).

Here, the actual mold clamping force is detected by the tie bar sensor 19 disposed on the tie bar 16 (step S42). The absolute value of the difference between the detected actual clamping force value and the set value is calculated by the calculation unit 76 (
If the absolute value of the difference is within the set threshold range (step S43), the basic condition is not corrected (step S44).

If the absolute value of the difference is outside the threshold range, the correction value is added to or subtracted from the original basic condition to obtain a new new basic condition, thereby adjusting the mold clamping force until it reaches the set clamping force. It repeats automatically (step S45).

FIG. 8 is a sequence step diagram of a molding process stage in which another example is implemented. The table 13 is rotated by driving the table rotation motor 51 to move one lower mold 25 to the S1 position, and the other lower mold 25 is moved to the S2 position to form the molded product in the previous step. Or insert an insert to be used in the next process (step S50).

Next, the mold discriminating sensor 52 confirms that one lower mold 25 is at the S1 position (step S51). In the process of molding the other lower mold, the motor 51 is driven to The lower mold 25 is moved to the S1 position (step S52).

The mold is closed and clamped according to the basic condition or the new basic condition (step S53), and when the mold clamping is completed, the actual mold clamping force is detected by the tie bar sensor 19 (step S54). The absolute value of the difference between the detected actual clamping force value and the set value is calculated by the calculation unit 76 (step S55). If the absolute value of this difference is within the set threshold range, the basic condition is not corrected (step S56).

If the value is outside the threshold range, a correction value is calculated based on the clamping force relational expression, and added or subtracted from the basic condition to obtain a new basic condition. Based on the new basic condition, the forward limit position of the crosshead 36 is calculated. Is moved forward or backward so that the actual mold clamping force is within the threshold range (step S5).
7).

Thereafter, the molten resin is injected and filled from an injection device (not shown) (step S58), and after the cooling of the filled resin is completed, the mold is opened to the mold opening limit (step S59). It is confirmed whether or not the molding with both lower molds 25 is completed, and if the molding is completed (step S60), the molding process is completed and the same cycle is continued thereafter. To proceed to the sequence step.

The configuration of the present invention is as described above, and in the mold clamping force adjustment of a toggle type vertical rotary injection molding machine in which a plurality of lower molds are mounted on a table and molded, a mold clamping force is applied to the mold clamping device. Providing a tie bar sensor to detect, a mold discrimination sensor, and a control device to correct and control the mold clamping force makes it possible to automatically adjust the mold clamping force, greatly increasing the adjustment time of the mold clamping force when replacing the mold. As it is shortened and accurate, it can also automatically cope with changes over time due to thermal expansion during the molding process, minimizing molding defects and enabling significant cost reductions.

In the present embodiment, for convenience of explanation, the vertical rotary injection molding machine has been described. However, the vertical rotary injection molding machine may have a slide table with a plurality of lower molds attached thereto. Of course.

Front view of vertical rotary type injection molding machine embodying the present invention A plan view of the same mold clamping device The block diagram which shows the structure of the control apparatus 75 of FIG. 1, and the flow of control. Sequence step diagram of the molding preparation stage implementing the present invention and other examples Sequence step diagram of mold clamping force correction processing A embodying the present invention Sequence step diagram of the molding process stage embodying the present invention Sequence step diagram of mold clamping force correction processing B in which another example is implemented Sequence step diagram of the molding process stage implementing another example Front view of a conventional vertical rotary injection molding machine

Explanation of symbols

13 Table 51 Motor 14 Upper platen 52 Mold discriminating sensor 15 Toggle support 61 Servo motor 19 Tie bar sensor 75 Controller 25 Lower mold S1 Mold clamping position 26 Upper mold S2 Setup position 36 Crosshead
41 Mold thickness adjusting device 42 Servo motor

Claims (5)

A machine frame and a table arranged to be rotatable or slidable with respect to the machine frame;
The upper platen is moved up and down with respect to the table via a mold clamping mechanism to open and close the mold, and the mold is clamped, and the upper mold attached to the upper platen is paired with the upper mold. In a vertical injection molding machine comprising a mold device comprising a plurality of lower molds attached to a table capable of clamping, an injection device disposed on the upper surface of the upper platen, and a control device for controlling them. A mold clamping device for a vertical injection molding machine, in which a tie bar sensor for detecting a mold clamping force is disposed on a tie bar portion of the mold clamping device. 2. The mold clamping apparatus for a vertical injection molding machine according to claim 1, wherein a mold discriminating sensor for discriminating a plurality of individual lower molds is provided. A control device comprising a setting unit, a storage unit for storing basic conditions and new basic conditions, a calculation unit for calculating a correction value based on detection values from the tie bar sensor and the mold discrimination sensor, and a control unit is provided. The mold clamping apparatus for a vertical injection molding machine according to claim 1. A machine frame, a table disposed rotatably or slidable, a mold clamping device provided with a tie bar sensor for detecting a mold clamping force and a mold discrimination sensor, one upper mold and a plurality of lower molds A mold clamping force adjustment method for a vertical mold injection molding machine comprising a mold device comprising a mold, an injection device, and a control device, based on an actual detected value of the mold clamping force detected during the mold clamping process Clamping force adjustment method that keeps the clamping force at the set value by automatically adjusting the stop position of the toggle support. A machine frame, a table disposed rotatably or slidable, a mold clamping device provided with a tie bar sensor and a mold discrimination sensor for detecting a mold clamping force, one upper mold and a plurality of lower molds A mold clamping force adjustment method for a vertical mold injection molding machine comprising a mold device comprising a mold, an injection device, and a control device, based on an actual detected value of the clamping force detected during the mold clamping process A mold clamping force adjustment method that keeps the clamping force at a set value by automatically adjusting the forward limit position of the crosshead.

Images