JP2009166054A - Molding method and molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding method which can efficiently mold a molding material in a biscuit space by the improvement of the treatment therefor. <P>SOLUTION: Regarding the molding method where, at the inside of a sleeve 5 communicating to the cavity Ca of a mold 101, an injection plunger 7 is progressed to the inside of the mold 101, a molten metal in the sleeve 5 is packed into the cavity Ca, and the molten metal in the cavity Ca is solidified while applying pressure to the molten metal in the cavity Ca with the injection plunger 7 via a molding material in a biscuit space BS at the inside of the mold 101 and also at the front face of the injection plunger 7, the molten metal in the cavity Ca is solidified as the molten metal in the biscuit space BS lies in a melted state, and mold opening is performed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a molding method such as a die casting method and a molding machine such as a die casting machine.

In a molding machine such as a cold chamber die casting machine, a technique is known in which an injection plunger is advanced into a mold in a sleeve and the molten metal in the sleeve is filled into a cavity of the mold (a space for forming a product part) ( Patent Documents 1 to 3). In this technique, after the molten metal is filled into the cavity, the molten metal in the cavity is solidified while applying pressure to the molten metal in the cavity through the molten metal in the mold and in the space in front of the injection plunger (biscuit space). At this time, the molten metal in the biscuit space is also solidified to form a biscuit. Then, after the solidified molten metal (molded product) is taken out of the cavity together with the product part and the biscuit, the biscuit is removed. Note that the die casting machines disclosed in Patent Documents 1 to 3 have another plunger or the like that can slide in the sleeve facing the injection plunger.
JP 58-148067 A Japanese Patent Laid-Open No. 11-123520 JP 2003-290900 A

  In the above-described prior art, since the biscuits are formed by solidifying the molten metal on the front surface of the injection plunger in the mold, the following various problems occur. For example, in order to sufficiently propagate the pressure applied to the molten metal in the biscuit space by the injection plunger until the molten metal in the cavity is solidified, a large biscuit space in which the molten metal solidifies after the cavity is required. As a result, the ratio of the biscuits to the molded product increases and the waste of the material increases. The cooling time of the biscuit space is the longest in the molding part (the space that forms the entire product including the part to be the product and the biscuit), and the productivity is lowered. The removal of thick biscuits greatly affects the difficulty of trimming the molded product. A lot of energy is required to redissolve the removed biscuits. Since a biscuit makes a molded product large and heavy, the capacity of the take-out robot or the like increases, and the operation is often complicated. Overall, it cannot be efficiently molded to form a solidified biscuit.

  An object of the present invention is to provide a molding method and a molding machine that can be efficiently molded by improving the handling of the molding material in the biscuit space.

  According to the molding method of the present invention, an injection plunger is advanced into the mold in a sleeve communicating with a mold cavity, and the molding material in a molten state in the sleeve is filled into the cavity. A molding method for solidifying the cavity molding material while applying pressure to the cavity molding material by the injection plunger through the molding material in the biscuit space, and the molding material in the biscuit space is in a molten state The molding material of the cavity is solidified and the mold is opened.

  The molding machine according to the present invention includes a sleeve that communicates with a cavity of a mold, an injection plunger that can advance into the mold, an injection plunger drive that drives the injection plunger, and the injection plunger. The mold is advanced into the mold and the molding material in the molten state in the sleeve is filled into the cavity, and the molding material of the cavity is formed by the injection plunger through the molding material in the biscuit space in the mold and in front of the injection plunger. A control unit that controls the injection plunger drive unit so as to solidify the cavity molding material while applying pressure, and the cavity molding material is kept in a molten state while the molding material in the biscuit space is in a molten state. Solidify and open the mold.

  Preferably, a heater for heating the molding material in the biscuit space is provided.

  Preferably, a first temperature sensor for detecting the temperature of the molding material in the biscuit space, and a first temperature sensor for detecting the temperature of the molding material in the communication space between the split surfaces of the mold and between the cavity and the biscuit space. Two temperature sensors and a cooler for cooling the molding material in the communication space, and the control unit melts the molding material in the biscuit space based on the detection results of the first and second temperature sensors. The heater and the cooler are controlled to solidify the molten metal in the communication space while maintaining the state.

  Preferably, an auxiliary plunger that faces the injection plunger and an auxiliary plunger drive unit that drives the auxiliary plunger, and the sleeve has a supply port that supplies a molten molding material into the sleeve. The control unit is configured to apply pressure to the molding material of the cavity through the molding material in the biscuit space with the auxiliary plunger facing the injection plunger with the biscuit space interposed therebetween. The molding material is solidified, the auxiliary plunger is moved in the retracting direction of the injection plunger, and the auxiliary plunger driving unit is controlled so as to push the molding material in the biscuit space back to the position of the supply port.

  Preferably, when the molding material is supplied from the supply port into the sleeve, the control unit is configured such that the injection plunger and the auxiliary plunger face each other across the supply port, and the injection plunger and the auxiliary plunger are opposed to each other. The injection plunger driver and the auxiliary plunger driver are controlled so that a space having a volume corresponding to the amount of molding material necessary and sufficient for one molding is formed between the plunger and the plunger.

  Preferably, the control unit is located at a position where the plunger tip of the injection plunger closes the supply port or on the opposite side of the cavity from the supply port, and the plunger tip of the auxiliary plunger is located in the biscuit space. Then, the injection plunger driving unit and the auxiliary plunger driving unit are controlled so that the mold opening is performed in a state where the sleeve is sealed by the auxiliary plunger and the injection plunger.

  A cold chamber die casting machine is preferred.

  According to this invention, it can shape | mold efficiently by the improvement of the handling of the molding material in a biscuit space.

  FIG. 1 is a cross-sectional view showing a main part of a die casting machine (cold chamber die casting machine) 1 as a molding machine according to an embodiment of the present invention.

  The die casting machine 1 is not illustrated in its entirety, but a mold clamping device that performs mold opening / closing and clamping of a mold 101 including a fixed mold 103 and a movable mold 105, and a mold 101 clamped by the mold clamping device. The injection device for supplying the molten metal to the cavity Ca formed in the above, the extrusion device for extruding the molded product formed by solidification of the molten metal from the fixed mold 103 or the moving mold 105, and the like.

  The mold clamping device includes a fixed die plate 3 that holds the fixed mold 103 and a moving die plate (not shown) that holds the moving mold 105. The movable die plate is configured to be movable in a direction close to or away from the fixed die plate 3, and the mold 101 is opened and closed by the movement of the movable die plate relative to the fixed die plate 3. The mold clamping device is, for example, a horizontal mold clamping type, and the fixed mold 103 and the movable mold 105 are opposed to each other in the horizontal direction (the left and right direction in FIG. 1).

  The mold clamping device may be a direct pressure type that directly uses a force generated in a power source such as a hydraulic cylinder or an electric motor for mold opening and closing and mold clamping, or a force generated in the power source is toggled. A toggle type that is used for mold opening / closing and clamping via a mechanism may be used, or a compound type that performs mold opening / closing and clamping by separate power sources may be used.

  The injection device includes a sleeve 5 that communicates with the cavity Ca, an injection plunger 7 that can slide in the sleeve 5, and an injection plunger drive unit 9 that drives the injection plunger 7. As the injection plunger 7 moves forward toward the cavity Ca by the driving force of the injection plunger drive unit 9, the molten metal in the sleeve 5 is filled into the cavity Ca. The injection device is, for example, a side injection type.

  The sleeve 5 is formed, for example, in a generally cylindrical shape as a whole, and is inserted and fixed in the horizontal direction with respect to the fixed die plate 3. A substantially cylindrical gate bush 11 inserted through the fixed mold 103 and fixed to the distal end side (the mold 101 side, the left side of the paper) of the sleeve 5 is disposed. The sleeve 5 has the gate bush 11 attached thereto. Via the cavity Ca. The sleeve 5 is made of, for example, a thermit material having a low thermal conductivity. Moreover, the gate bush 11 is made of, for example, a ceramic material.

  The inner space of the sleeve 5 and the gate bush 11 is formed to have the same diameter and cross-sectional shape, and is connected so as to extend linearly, and the injection plunger 7 is connected to the gate bush 11 as indicated by a two-dot chain line. It is possible to advance to the interior space. In other words, the injection plunger 7 can advance to the inside of the mold 101. The sleeve 5 and the gate bush 11 may be integrated.

  A hot water supply port 5 a for supplying molten metal into the sleeve 5 is formed on the lower surface of the sleeve 5, and a hot water supply pipe 13 is connected to the hot water supply port 5 a. The other end of the hot water supply pipe 13 is connected to a heat retention furnace (not shown) that holds the molten metal. The die casting machine 1 supplies the molten metal of the heat-retaining furnace to the sleeve 5 through the hot water supply pipe 13 by using a driving force or pneumatic pressure of an electromagnetic pump or a mechanical pump (not shown).

  The injection plunger 7 has an injection plunger tip 15 that slides on the sleeve 5 and the gate bush 11, and an injection plunger rod 17 that is fixed to the injection plunger tip 15. The injection plunger 7 is movable at least between an original position P0 indicated by a solid line and a forward position P1 indicated by a two-dot chain line.

  The injection plunger drive unit 9 is constituted by, for example, a hydraulic cylinder, and although not particularly shown, a cylinder rod linearly connected to the injection plunger rod 17, a piston fixed to the cylinder rod, and a piston sliding And by selectively supplying pressure oil to the two cylinder chambers defined by the pistons of the cylinder tube, the injection plunger 7 is advanced to the cavity Ca side or retracted to the opposite side. Let

  Control of the injection plunger drive unit 9 and the mold clamping device is performed by the control unit 19. The control unit 19 is configured by a computer including, for example, a CPU, a ROM, a RAM, an external storage device, and the like. Output to a drive source such as the injection plunger drive unit 9.

  A space which is the inside of the mold 101 and the front surface of the injection plunger 7 located at the advance position P1 is a biscuit space BS in which biscuits are formed in the prior art. In this embodiment, after the injection plunger 7 is advanced to fill the cavity Ca with the molten metal, the molten metal of the cavity Ca is solidified while the molten metal of the biscuit space BS is in a molten state to form a molded product, and the casting is finished. To do. The die casting machine 1 has the following configuration in order to suitably perform such casting.

  The die casting machine 1 includes a hot water supply pipe heater 21 for heating the molten metal in the hot water supply pipe 13, a sleeve heater 23 for heating the molten metal in the sleeve 5, and the inside of the gate bush 11 (including the biscuit space BS). And a heater 25 for the gate bush for heating the molten metal. Further, the mold 101 is formed with a temperature adjustment hole TH for adjusting the temperature of the molten metal in a portion (runner Rn and gate Gt) that communicates the biscuit space BS and the cavity Ca.

  The hot water supply pipe heater 21 is constituted by, for example, a coil disposed around the hot water supply pipe 13, and is heated by heat generated by the hot water supply pipe heater 21 or by induction heating with a heating amount corresponding to the applied voltage. The molten metal in the hot water supply pipe 13 is heated. The hot water supply pipe heater 21 is disposed, for example, from a heat retention furnace (not shown) to the hot water supply port 5a.

  The sleeve heater 23 is constituted by, for example, a coil disposed around the sleeve 5, and the sleeve is heated by the heat generated by the sleeve heater 23 or by induction heating with a heating amount corresponding to the applied voltage. The molten metal in 5 is heated. The sleeve heater 23 is disposed, for example, over a portion of the sleeve 5 that protrudes behind the fixed die plate 3.

  The gate bush heater 25 is constituted by, for example, a coil disposed around the gate bush 11 and is heated according to the applied voltage by heat generated by the gate bush heater 25 or by induction heating. The molten metal in the spout bush 11 is heated by the amount. The gate bush heater 25 is, for example, disposed over the gate gate bush 11 as a whole.

  For example, the temperature adjustment hole TH is provided independently of each of the fixed mold 103 and the movable mold 105 around the runner Rn and the gate Gt (mainly the runner Rn). A refrigerant (for example, water) flows through the temperature adjustment hole TH, and the refrigerant cools the molten metal in the runner Rn and the gate Gt to promote solidification of the molten metal. The temperature and flow rate of the refrigerant flowing through the temperature adjustment hole TH are controlled by a pump, a condenser, etc. (not shown).

  The die casting machine 1 also includes a temperature sensor 27 that detects the temperature in the hot water supply port 5a, a temperature sensor 29 that detects the temperature in the biscuit space BS, and a temperature sensor 31 that detects the temperature of the runner Rn.

  The temperature sensor 27 is fixed to the sleeve 5 adjacent to the hot water supply port 5a, for example. The temperature sensor 29 is fixed to the gate bush 11 adjacent to the biscuit space BS, for example. For example, the temperature sensor 31 is fixed to the fixed mold 103 adjacent to the runner Rn.

  The temperature sensors 27, 29, and 31 output an electrical signal corresponding to the ambient temperature of these temperature sensors to the control unit 19. Based on the signals from these temperature sensors, the control unit 19 controls operations of the hot water supply pipe heater 21, the sleeve heater 23, the gate bush heater 25, and a pump that causes the refrigerant to flow through the temperature adjustment hole TH.

  For example, when there is a molten metal in the hot water supply pipe 13, the sleeve 5, and the spout bush 11, the control unit 19 keeps the temperature of the molten metal at a certain threshold value or more so that the molten metal does not solidify. The heater 21 for the hot water supply pipe, the heater 23 for the sleeve, and the heater 25 for the gate bush are controlled. In addition, when the molten metal is supplied to the runner Rn and the gate Gt, the control unit 19 causes the refrigerant flowing through the temperature adjustment hole TH so that the temperature of the molten metal is below a certain threshold value so that the molten metal is solidified. Control the flow rate. However, the control unit 19 adjusts the temperature of the runner Rn and the gate Gt so as not to solidify before the melt of the cavity Ca.

  Further, the die casting machine 1 includes an auxiliary plunger 33 that faces the injection plunger 7 and an auxiliary plunger drive unit 35 that drives the auxiliary plunger 33.

  The auxiliary plunger 33 is configured to be slidable through a sliding hole SH provided in the movable mold 105. The sliding hole SH is formed in the same diameter and cross-sectional shape as the internal space of the sleeve 5 and the gate bush 11 and is continuous with the internal space. That is, the sleeve 5, the gate bush 11 and the moving mold 105 (mold 101) are formed with one continuous hole extending in the moving direction of the injection plunger 7 and the auxiliary plunger 33.

  The auxiliary plunger 33 has an auxiliary plunger tip 37 that can slide in the one continuous hole, and an auxiliary plunger rod 39 fixed to the auxiliary plunger tip 37. The diameter and cross-sectional shape of the auxiliary plunger tip 37 are the same as those of the injection plunger tip 15.

  The auxiliary plunger drive part 35 is comprised by the hydraulic cylinder, for example. The configuration of the hydraulic cylinder is as described in the explanation of the injection plunger drive unit 9. The auxiliary plunger drive unit 35 may be fixedly provided with respect to the fixed die plate 3 or may be fixedly provided with respect to the movable die plate. You may select from suitable members, such as the plate 3, the movement die plate, and the base in which these are mounted. The auxiliary plunger drive unit 35 is controlled by the control unit 19.

  The operation of the die casting machine 1 having the above configuration will be described.

  1-6 is a figure explaining operation | movement of the die-casting machine 1 in time series order. Hereinafter, it demonstrates in order along FIGS.

  FIG. 1 shows a state in which the die closing of the die casting machine 1 is finished. In this state, the injection plunger 7 is located at the original position P0 behind the hot water supply port 5a (opposite the cavity Ca), and the auxiliary plunger 33 is behind the biscuit space BS (injection plunger 7). The front side, the left side of the drawing).

  FIG. 2 shows a state where a sufficient amount of molten metal necessary for one molding is supplied into the sleeve 5. Before this state is reached, the control unit 19 first moves the auxiliary plunger 33 from the original position P10 in FIG. 1 to the measurement position P11 in FIG. The injection plunger 7 remains at the original position P0 in FIG. The measurement position P11 is a position where the volume of the space between the auxiliary plunger 33 and the injection plunger 7 facing each other across the hot water supply port 5a becomes a size corresponding to the amount of hot water necessary and sufficient for one molding. Based on product information, in other words, information on the mold 101, the user or the control unit 19 calculates.

  Next, the control part 19 supplies the molten metal of a heat retention furnace in the sleeve 5 through the hot water supply pipe 13 and the hot water supply port 5a by control of a pump etc. which are not illustrated. Since the auxiliary plunger 33 is previously positioned at the measuring position P11, the molten metal necessary and sufficient for one molding is accurately supplied into the sleeve 5.

  When the filling of the molten metal between the auxiliary plunger 33 and the injection plunger 7 is completed, the load value of a device such as a pump (not shown) for supplying the molten metal into the sleeve 5 increases. For example, the control unit 19 determines whether or not the supply of the molten metal between the auxiliary plunger 33 and the injection plunger 7 is completed based on the increase in the load value, and enters the sleeve 5 of the device such as a pump. Stop supplying molten metal.

  While the molten metal is being supplied into the sleeve 5, the inert gas or air in the sleeve 5 is exhausted by a gas venting unit (not shown), but the illustration is omitted. Such a degassing unit may be configured, for example, by the same configuration as the unit for degassing from the cavity Ca when the cavity Ca is filled with molten metal. Further, it is possible to supply a certain amount of molten metal into the sleeve 5 while venting gas through the cavity Ca while keeping the auxiliary plunger 33 at the original position P10, and then moving the auxiliary plunger 33 to the measuring position P11. Good.

  FIG. 3 shows a state where the cavity Ca is filled with molten metal. Before this state is reached, the control unit 19 first moves both the injection plunger 7 and the auxiliary plunger 33 to the cavity Ca side. When the space between the injection plunger 7 and the auxiliary plunger 33 communicates with the cavity Ca via the runner Rn or the like, the molten metal in the space between the spaces can be supplied to the cavity Ca. When the auxiliary plunger 33 is stopped at the original position P10 and the injection plunger 7 continues to advance, the molten metal is supplied to the cavity Ca.

  In addition, since the molten metal is densely arranged on the front surface of the injection plunger 7 by arranging the auxiliary plunger 33, the possibility that the molten metal entrains air or the like when the injection plunger 7 moves forward is extremely low. The forward movement is relatively fast. Further, the auxiliary plunger 33 may be moved back to the original position P10 or a position where the space between the injection plunger 7 communicates with the cavity Ca by being pushed back by the injection plunger 7 through the molten metal. Alternatively, the auxiliary plunger drive unit 35 may be moved to the original position P10 by the driving force.

  In the state of FIG. 3, the molten metal in the cavity Ca is solidified while pressure is applied by the injection plunger 7 via the molten metal in the biscuit space BS. However, the molten metal in the biscuit space BS is kept above a certain temperature by the control unit 19 controlling the gate bush heater 25 based on the detection value of the temperature sensor 29 and does not solidify. That is, the molten metal in the biscuit space BS is kept in a molten state. On the other hand, the molten metal of the runner Rn is controlled to a temperature below a certain level by the control unit 19 controlling the flow rate of the refrigerant flowing through the temperature adjustment hole TH based on the detection value of the temperature sensor 31, and solidifies.

  Note that the thickness T of the biscuit space BS determined by the advance position P1 of the injection plunger 7 and the original position P10 of the auxiliary plunger 33 is such that the runner Rn melts more easily than the melt in the biscuit space BS. It is preferable that the thickness is set to be larger than the thickness t. For example, the thickness T is preferably 2 to 4 times the thickness t.

  In addition, the amount of hot water necessary and sufficient for one molding for determining the measurement position P11 described above is the volume of the space between the divided surfaces of the mold 101 (cavity Ca, gate Gt and runner Rn) and the volume of the biscuit space BS. It is determined by the shape of the space between the divided surfaces, the inner diameter of the sleeve 5 (pouring bush 11), and the thickness T.

  FIG. 4 shows a state in which a molded product is formed by the solidification of the molten metal and the recovery of the molten metal in the biscuit space BS is started. Before this state is reached, the control unit 19 first confirms whether or not the melt of the cavity Ca, the gate Gt, and the runner Rn has solidified based on the detection value of the temperature sensor 31. For example, the control unit 19 determines whether or not the detection value of the temperature sensor 31 has reached a predetermined temperature or less, whether or not a predetermined time has elapsed since the detection value of the temperature sensor 31 has decreased to a predetermined temperature or less, etc. Judgment is made.

  When it is confirmed that the molten metal such as the runner Rn has solidified, the control unit 19 moves the auxiliary plunger 33 and the injection plunger 7 to the opposite side from the cavity Ca. Thereby, the molten metal in the biscuit space BS is pushed back to the side opposite to the cavity Ca by the auxiliary plunger 33. When the space between the injection plunger 7 and the auxiliary plunger 33 communicates with the hot water supply pipe 13 through the hot water supply port 5a, the molten metal in the biscuit space BS can be collected into the hot water supply pipe 13. The injection plunger 7 is stopped at the original position P0, and the auxiliary plunger 33 is stopped at the recovery position P12.

  The original position P0 of the injection plunger 7 is, for example, a position where the front surface of the injection plunger 7 coincides with the end of the hot water supply port 5a opposite to the cavity Ca. The collection position P12 of the auxiliary plunger 33 is, for example, a position where a space having the same volume as the biscuit space BS is formed between the auxiliary plunger 33 and the injection plunger 7 facing each other across the hot water supply port 5a.

  The advancement of the auxiliary plunger 33 is performed at a relatively high speed. The injection plunger 7 may move to the original position P0 by being pushed back by the auxiliary plunger 33 through the molten metal, or may be moved to the original position P0 by the driving force of the injection plunger drive unit 9.

  FIG. 5 shows a state in which the molten metal is collected in the hot water supply pipe 13. The molten metal between the auxiliary plunger 33 and the injection plunger 7 flows into the hot water supply pipe 13 by its own weight. The molten metal in the hot water supply pipe 13 is at a liquid level equivalent to the liquid level in the heat insulation furnace or until the molten metal reaches an appropriate liquid level determined by the pressure received from the pneumatic mechanism or the like in the heat insulation furnace or the like. Flow into.

  At this time, in the space between the auxiliary plunger 33 and the injection plunger 7, for example, air or inert gas from a degassing means (not shown) that degassed when supplying the molten metal into the sleeve 5. Is supplied. The hot water supply port 5a has a diameter-enlarged portion that expands to the same size as the gap between the auxiliary plunger 33 and the injection plunger 7 on the inner side of the sleeve 5 so that the molten metal quickly flows into the hot water supply pipe 13 by its own weight. Are provided, and the bottom surface of the enlarged diameter portion is formed so that the inner side is inclined downward.

  FIG. 6 shows a state where the mold is opened. Before entering this state, the control unit 19 first retracts the auxiliary plunger 33 to the sealed position P13 where the auxiliary plunger tip 37 is located in the biscuit space BS. The injection plunger 7 remains in the original position P0. At this time, the inside of the sleeve 5 is sealed with both ends closed by the auxiliary plunger 33 and the injection plunger 7. More precisely, the space formed by the pouring bush 11, the sleeve 5, the hot water supply pipe 13 and the liquid level of the molten metal in the hot water supply pipe 13 is sealed by the auxiliary plunger 33 and the injection plunger 7. Next, the control unit 19 opens the mold by driving the movable die plate.

  Thereafter, in the die casting machine 1, a molded product is extruded from the mold 101 by an extrusion device, and a mold release agent or the like is sprayed on the mold 101 for the next cycle. At this time, the auxiliary plunger 33 is held at the position shown in FIG. 6 and prevents the release agent or the like from entering the sleeve 5. And in the next cycle, the process of FIGS. 1-6 is performed again. The auxiliary plunger 33 may be returned to the position in FIG. 1 either before or after mold closing. Moreover, you may move from the position of FIG. 6 to the position of FIG. 2 without passing through the position of FIG.

  The heater 21 for hot water supply pipes, the heater 23 for sleeves, and the heater 25 for gate gate bushes may perform a heating operation over the entire process shown in FIGS. 1 to 6 or may perform heating only in a specific process. . For example, the hot water bush bushing heater 25 starts from the start of filling of the molten metal into the cavity Ca from the sleeve 5 until the molten metal in the biscuit space BS starts to be pushed back toward the hot water supply port 5a (see FIGS. 3 and 4). The sleeve heater 23 may perform the heating operation only after the start of the supply of the molten metal to the sleeve 5 until the start of the filling of the molten metal from the sleeve 5 to the cavity Ca (see FIG. 2 and FIG. 3), and the heating operation is performed only during the period from when the molten metal in the biscuit space BS starts to be pushed back toward the hot water supply port 5a until it is recovered by the hot water supply pipe 13 (see FIGS. 4 and 5). Also good.

  According to the above embodiment, the injection plunger 7 is advanced into the mold 101 in the sleeve 5 communicating with the cavity Ca of the mold 101 to fill the cavity Ca with the molten molding material in the sleeve 5. In a molding method in which the molding material of the cavity Ca is solidified while applying pressure to the molding material of the cavity Ca by the injection plunger 7 through the molding material of the biscuit space BS which is the front surface of the injection plunger 7 in the mold 101. Since the molding material in the cavity Ca is solidified and the mold is opened while the molding material is in a molten state, in other words, the casting is finished without solidifying the molten metal in the biscuit space BS, so the biscuit space BS Problems caused by solidification of molten metal such as waste of materials, increased cooling time, Difficult and the like of the timing of the issue is resolved. In addition, this embodiment can also be understood that the biscuit less was achieved, and can also be regarded that the hot biscuit was achieved.

  Moreover, since the die-casting machine 1 has the gate bush heater 25 for heating the molding material of the biscuit space BS, the molten metal in the biscuit space BS can be reliably maintained in a molten state.

  The die casting machine 1 detects the temperature of the molding material of the runner Rn that is between the split surface of the mold 101 and between the cavity and the biscuit space BS, and a temperature sensor 29 that detects the temperature of the molding material of the biscuit space BS. And a cooler including a temperature adjustment hole TH for cooling the temperature of the molding material of the runner Rn, and the control unit 19 performs molding in the biscuit space BS based on the detection results of the temperature sensors 29 and 31. Since the gate bush heater 25 is controlled so that the molten metal of the runner Rn is solidified while maintaining the material in a molten state, the molten metal between the divided surfaces can be solidified while the molten metal in the biscuit space BS is maintained in a molten state. Can be accurate.

  The die casting machine 1 includes an auxiliary plunger 33 that faces the injection plunger 7 and an auxiliary plunger drive unit 35 that drives the auxiliary plunger 33, and supplies a molding material in a molten state to the sleeve 5. The hot water supply port 5a is provided, and the control unit 19 applies pressure to the molding material of the cavity Ca through the molding material in the biscuit space BS with the auxiliary plunger 33 facing the injection plunger 7 with the biscuit space BS interposed therebetween. Then, the molding material in the cavity Ca is solidified, and then the auxiliary plunger 33 is moved in the backward direction of the injection plunger 7 to control the auxiliary plunger drive unit 35 so as to push the molding material in the biscuit space BS back to the hot water supply port 5a. Therefore, the molten metal of the biscuit space BS that has remained in a molten state is recovered from the hot water supply port 5a. It is possible to perform such a suitably Rukoto.

  When the molten metal is supplied from the hot water supply port 5a to the sleeve 5, the control unit 19 faces the injection plunger 7 and the auxiliary plunger 33 with the hot water supply port 5a interposed therebetween, and is necessary and sufficient for one molding between them. Since the injection plunger driving unit 9 and the auxiliary plunger driving unit 35 are controlled so that a space having a volume corresponding to the amount of the molten metal is formed, for example, in the previous cycle, the molten metal in the melted biscuit space BS is obtained. Even if it remains in the sleeve 5, it is possible to accurately measure the molten metal for the next cycle, and to reduce the risk of entrainment of air or the like when the injection plunger is advanced at high speed. An effect is produced.

  The control unit 19 is configured such that the injection plunger tip 15 of the injection plunger 7 is located on the opposite side of the mold 101 from the hot water supply port 5a, the auxiliary plunger tip 37 of the auxiliary plunger 33 is located in the biscuit space BS, and the sleeve 5 is auxiliary. Since the injection plunger drive unit 9 and the auxiliary plunger drive unit 35 are controlled so that the mold opening is performed in a state of being sealed by the plunger 33 and the injection plunger 7, the spray liquid or air of the mold enters the sleeve 5. It is suppressed that the molten metal is contaminated and cooled to deteriorate the quality of the molded product.

  In the above embodiment, the die casting machine 1 is an example of the molding machine of the present invention, the mold 101 is an example of the mold of the present invention, and the molten metal is an example of the molten molding material of the present invention. The hot water supply port 5a is an example of the supply port of the present invention, the temperature sensor 29 is an example of the first temperature sensor of the present invention, the temperature sensor 31 is an example of the second temperature sensor of the present invention, and the runner Rn is It is an example of the communication space of the invention, and the temperature adjustment hole TH, the refrigerant flowing through the temperature adjustment hole TH, the pump (not shown) for sending the refrigerant, and the like are examples of the cooler of the present invention.

  The present invention is not limited to the above embodiment, and may be implemented in various aspects.

  The molding machine is not limited to a die casting machine, and may be, for example, an injection molding machine. The die casting machine is not limited to a cold chamber die casting machine, and may be a hot chamber die casting machine or the like. The molding machine is not limited to a horizontal clamping type or a horizontal injection type, and may be a vertical clamping type or a vertical injection type. The sleeve is not limited to the one extending in the horizontal direction, and may extend in a direction inclined with respect to the horizontal direction.

  A heater for heating the molding material in the biscuit space is not an essential requirement of the present invention. For example, as described in the embodiment, if the thickness T of the biscuit space is made larger than the thickness t of the runner and the periphery of the biscuit space is surrounded by a highly heat-insulating member, the molding material of the biscuit space is melted. It is possible to end the molding cycle by solidifying the molding material in the cavity while keeping the state. In particular, when the cavity is thin, the molding material in the cavity can be rapidly solidified to complete the molding cycle.

  The auxiliary plunger is not a requirement of the present invention. Even without an auxiliary plunger, it is possible to recover the molding material in the biscuit space. For example, if the sleeve is inclined such that the supply port (hot water supply port 5a of the embodiment) is on the lower side, the molding material in the biscuit space can be recovered from the supply port by its own weight. Even if the molding material in the biscuit space is not collected from the supply port, an amount of the molding material obtained by subtracting the amount of the molding material in the biscuit space from the amount of molding material necessary and sufficient for one molding is obtained in the next cycle. If it supplies, the molding material of biscuit space does not need to be collect | recovered from a supply port.

  It is also possible to provide an auxiliary plunger and not collect the molding material in the biscuit space from the supply port. In this case, even if the molding material in the biscuit space remains in the sleeve, the molding material necessary and sufficient for the next cycle can be accurately measured by setting the distance between the auxiliary plunger and the injection plunger as shown in FIG.

  In addition to the supply port, a recovery port for recovering the molding material in the biscuit space may be provided. For example, the supply port is provided on the upper surface of the sleeve extending in the horizontal direction or in a direction inclined in the horizontal direction, and the molten metal is supplied from the supply port to the sleeve by a ladle, and the lower surface of the sleeve is more cavity than the supply port. If the recovery port is provided on the opposite side, the molding material is supplied from the supply port into the sleeve with the injection plunger tip positioned between the supply port and the recovery port. In addition, the molding material in the biscuit space can be collected from the inside of the sleeve to the collection port in a state of being positioned on the side opposite to the cavity.

  When the sleeve is sealed by the injection plunger and the auxiliary plunger, the injection plunger tip is arranged not only at a position opposite to the cavity from the supply port but also at a position blocking the supply port (hot water supply port 5a in the embodiment). Also good. In this case, the injection plunger tip closes one end of the sleeve (on the injection plunger rod side) and the supply port.

Sectional drawing which shows the principal part of the die-casting machine of embodiment of this invention in a mold closed state. Sectional drawing which shows the principal part of the die-casting machine of FIG. 1 in the state with which the molten metal was filled in the sleeve. Sectional drawing which shows the principal part of the die-casting machine of FIG. 1 in the state with which the cavity was filled with molten metal. Sectional drawing which shows the principal part of the die-casting machine of FIG. 1 in the state of the process of collect | recovering the molten metal of biscuit space. Sectional drawing which shows the principal part of the die-casting machine of FIG. 1 in the state which collection | recovery of the molten metal of biscuit space was complete | finished. Sectional drawing which shows the principal part of the die-casting machine of FIG. 1 in a mold open state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Die casting machine (molding machine), 5 ... Sleeve, 7 ... Injection plunger, 9 ... Injection plunger drive part, 19 ... Control part, 101 ... Mold (mold), Ca ... Cavity, BS ... Biscuit space.

Claims (8)

In the sleeve communicating with the mold cavity, the injection plunger is advanced into the mold so that the molten molding material in the sleeve is filled into the cavity, and the molding material in the biscuit space in the mold and in front of the injection plunger A molding method for solidifying the molding material of the cavity while applying pressure to the molding material of the cavity by the injection plunger through
While keeping the molding material of the biscuit space in a molten state,
Solidifying the molding material of the cavity,
Molding method to open the mold. A sleeve that communicates internally with the mold cavity;
An injection plunger capable of advancing in the sleeve into the mold;
An injection plunger drive unit for driving the injection plunger;
The injection plunger is advanced into the mold to fill the cavity with the molten molding material in the sleeve, and the injection plunger passes through the molding material in the biscuit space in the mold and in front of the injection plunger. A control unit that controls the injection plunger drive unit so as to solidify the molding material of the cavity while applying pressure to the molding material of the cavity;
Have
While keeping the molding material of the biscuit space in a molten state,
Solidifying the molding material of the cavity,
Molding machine that performs mold opening. The molding machine according to claim 2, further comprising a heater that heats the molding material in the biscuit space. A first temperature sensor for detecting the temperature of the molding material in the biscuit space;
A second temperature sensor for detecting the temperature of the molding material in the communication space between the split surfaces of the mold and between the cavity and the biscuit space;
A cooler for cooling the molding material in the communication space;
Have
The controller controls the heater and the cooler so as to solidify the molten metal in the communication space while maintaining the molding material in the biscuit space in a molten state based on the detection results of the first and second temperature sensors. The molding machine according to claim 3. An auxiliary plunger facing the injection plunger;
An auxiliary plunger drive unit for driving the auxiliary plunger;
Have
The sleeve is provided with a supply port for supplying a molten molding material into the sleeve,
The controller is
In a state where the auxiliary plunger faces the injection plunger across the biscuit space, the molding material in the cavity is solidified while applying pressure to the molding material in the cavity through the molding material in the biscuit space. The molding according to any one of claims 2 to 4, wherein the auxiliary plunger drive unit is controlled so as to move the plunger in the backward direction of the injection plunger and push the molding material in the biscuit space back to the position of the supply port. Machine. When the molding material is supplied from the supply port into the sleeve, the control unit opposes the injection plunger and the auxiliary plunger with the supply port interposed therebetween, and between the injection plunger and the auxiliary plunger. The molding machine according to claim 5, wherein the injection plunger driving unit and the auxiliary plunger driving unit are controlled so that a space having a volume corresponding to the amount of molding material necessary and sufficient for one molding is formed. The control unit is located at a position where the plunger tip of the injection plunger closes the supply port or on the opposite side of the cavity from the supply port, the plunger tip of the auxiliary plunger is located in the biscuit space, and the sleeve 7. The molding machine according to claim 5, wherein the injection plunger driving unit and the auxiliary plunger driving unit are controlled such that mold opening is performed in a state where the mold is opened by the auxiliary plunger and the injection plunger. It is a cold chamber die-casting machine. The molding machine according to any one of claims 2 to 7.

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