JP2009166056A - Molding method and molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding method which can suitably recover a molding material. <P>SOLUTION: In the molding method where a molten metal is fed from a molten metal supply port 5a provided at a supply route SR communicating to a space between the divided faces in a mold 101, an injection plunger 7 is progressed to the side of the space between the divided faces in the supply route SR to fill the molten metal into a cavity Ca, and the molten metal in the cavity Ca is solidified while applying pressure to the molten metal in the cavity Ca by an injection plunger 7 via the molten metal in a biscuit space BS; the molding material in the cavity Ca is solidified as the molten metal in the biscuit space BS lies in a melted state, and the molten metal in the biscuit space BS is recovered from a recovery port 5b provided at the supply route SR separately from the molten metal supply port 5a. <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, the molding material coagulates together with the molding material between the divided surfaces at the communicating portion (tip) of the supply path for supplying the molding material between the divided surfaces to the part surface, and forms a part of the molded product. It is taken out. The solidified part is called a biscuit in a cold chamber die casting machine (for example, Patent Documents 1 to 3), and is called a sprue in a hot chamber die casting machine (for example, Patent Documents 4 and 5).

Since such a part is a wasteful part of the material, in Patent Documents 4 and 5, the melt (in the molten state) of the cavity (the space forming the product part) is maintained while the sprue is kept in the molten state. (Metal) is solidified and casting is finished. Patent Documents 1 to 3 disclose a technique in which another plunger is provided so as to face the injection plunger that moves forward in the sleeve and fills the cavity with the molten metal in the sleeve.
JP 58-148067 A Japanese Patent Laid-Open No. 11-123520 JP 2003-290900 A JP-A-9-38760 Special table 2003-509215 gazette

  As a new technology applying the methods of cited references 4 and 5, the molten metal to be sprue or biscuit is kept in a molten state, the molten metal in the cavity is solidified, and then the molten metal to be biscuit is recovered from the supply port. It is possible to do. However, some molding machines have a configuration in which it is difficult to recover the molding material at the hot water supply port. For example, in the cold chamber die casting machines of Patent Documents 1 to 3, molten metal is supplied by a ladle to a hot water supply port formed on the upper surface of a sleeve extending in the horizontal direction. In the die casting machine having such a configuration, it is extremely difficult to recover the molten metal from the hot water supply port against the dead weight of the molten metal.

  An object of the present invention is to provide a molding method and a molding machine that can favorably recover the molding material.

  In the molding method of the present invention, a molten molding material is supplied to the supply path from a supply port provided in a supply path communicating between the split surfaces of the mold, and the injection plunger is moved to the side between the split surfaces in the supply path. The mold material is advanced to fill the cavities between the divided surfaces, and the injection plunger applies pressure to the mold material of the cavities through the molding material at the communication portion between the divided surfaces of the supply path. A molding method for solidifying the molding material of the cavity, wherein the molding material of the cavity is solidified while the molding material of the communication portion is in a molten state, and the molding material of the communication portion is separated from the supply port. Recover from a recovery port provided in the supply path.

  The molding machine according to the present invention includes an injection plunger that is slidable on a supply path that communicates between divided surfaces of a mold, an injection plunger drive that drives the injection plunger, and the supply from a supply port provided in the supply path. The molten molding material supplied to the passage is advanced into the cavity between the divided surfaces by advancing the injection plunger, and the injection plunger is passed through the molding material at the communication portion between the divided surfaces of the supply passage. And a control unit that controls the injection plunger drive unit so as to solidify the cavity molding material while applying pressure to the cavity molding material, and the molding material of the communication part remains in a molten state. The molding material of the cavity is solidified, and the molding material of the communication portion is recovered from a recovery port provided in the supply path separately from the supply port.

  Preferably, the supply plunger constitutes a portion where the injection plunger slides, extends in a horizontal direction or a direction inclined in the horizontal direction, the supply port opens on an upper surface, the lower surface and the cavity more than the supply port A sleeve having an opening on the opposite side to the recovery port, and the control unit has a plunger tip of the injection plunger on the opposite side of the cavity from the supply port, After the molding material is supplied from the supply port to the supply path in a closed position or in a state of being located on the cavity side with respect to the recovery port, and after the molding material is solidified, the injection plunger is moved more than the recovery port. The injection plunger drive unit is controlled so that the molding material of the communication unit is recovered to the recovery port by being retracted to the opposite side of the cavity.

  Preferably, the sleeve includes an auxiliary plunger that faces the injection plunger, and an auxiliary plunger driving unit that drives the auxiliary plunger, and the control unit includes a plunger tip of the injection plunger that is connected to the supply port. The position opposite to the cavity, the position closing the recovery port, or positioned closer to the cavity than the recovery port, and the auxiliary plunger positioned closer to the cavity than the supply port In a state, the molding material is supplied from the supply port to the supply path, and the auxiliary plunger faces the injection plunger with the communication portion interposed therebetween, and the molding material in the cavity is formed via the molding material in the communication portion. While applying pressure, the molding material of the cavity is solidified, and the auxiliary plunger is defined as the cavity. For controlling the injection plunger driver and the auxiliary plunger driver molding material of the communicating portion is moved to the contralateral side so push back to the position of the recovery port.

  Preferably, a ladle is provided for supplying a molten molding material to the supply port.

  A cold chamber die casting machine is preferred.

  According to the present invention, it is possible to suitably recover the molding material.

  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 used for mold opening / closing and clamping via a mechanism may be used, or a compound type in which mold opening / closing and mold princess are performed by separate power sources may be used.

  Further, when the mold 101 is closed, a cavity Ca that forms a product portion between the dividing surface 103a and the dividing surface 105a, a gate Gt that communicates with the cavity Ca, and a communication with the gate Gt. A runner Rn is formed.

  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 internal space of the sleeve 5 and the gate bush 11 constitutes a supply path SR that communicates between the divided surfaces of the mold 101. The supply path SR is formed in the same diameter and cross-sectional shape from the sleeve 5 to the gate bush 11 and is connected so as to extend linearly, and the injection plunger 7 extends to the internal space of the gate bush 11. It is possible to move forward. 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 upper surface of the sleeve 5. For example, the molten metal is supplied to the hot water supply port 5a by a ladle 13. The ladle 13 is driven by, for example, an arm (not shown), draws up the molten metal held in a heat retaining furnace (not shown), and pours it into the hot water supply port 5a.

  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 tip 15 is formed in a size that can block the hot water supply port 5a, for example.

  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, the mold clamping device, and the arm that drives the ladle 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.

  The communication portion between the divided surfaces of the mold 101 in the supply path SR is a biscuit space BS in which biscuits are formed in the prior art (see FIG. 2). 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 sleeve heater 23 for heating the molten metal in the sleeve 5 and a gate bush heater 25 for heating the molten metal in the gate bush 11 (including the biscuit space BS). . 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 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).

  Moreover, it has the temperature sensor 29 which detects the temperature in biscuit space BS, and the temperature sensor 31 which detects the temperature of runner Rn. For example, the temperature sensor 31 is fixed to the gate bush 11 adjacent to the biscuit space BS. For example, the temperature sensor 31 is fixed to the fixed mold 103 adjacent to the runner Rn.

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

  For example, when there is a molten metal in the sleeve 5 and the spout bush 11, the controller 19 prevents the molten metal from solidifying so that the temperature of the molten metal is maintained at a certain threshold value or more. In addition, the gate heater 25 is 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.

  Furthermore, the die casting machine 1 has the following configuration in order to suitably recover the molten metal in the biscuit space BS that is kept in a molten state until the molten metal in the cavity Ca is solidified as described above.

  A recovery port 5b is opened on the lower surface of the sleeve 5 on the side opposite to the cavity Ca from the hot water supply port 5a. For example, a recovery pipe 14 is connected to the recovery port 5b, and the recovery pipe 14 extends to, for example, a heat-retaining furnace from which the ladle 13 pumps molten metal. The molten metal that has flowed into the recovery port 5b flows, for example, to the heat insulation furnace through the collection pipe 14 by its own weight, or is sent to the heat insulation furnace by an electromagnetic pump, a mechanical pump, or the like.

  A recovery tube heater 22 for heating the molten metal in the recovery tube 14 is provided around the recovery tube 14. The recovery pipe heater 22 is constituted by, for example, a coil disposed around the recovery pipe 14 and is heated by the heat generated by the recovery pipe heater 22 or by induction heating with a heating amount corresponding to the applied voltage. The molten metal in the collection pipe 14 is heated. The recovery pipe heater 22 is disposed, for example, from the heat retaining furnace to the recovery port 5b.

  A temperature sensor 24 is provided at a position adjacent to the recovery port 5b. Similar to the temperature sensor 29 and the like, the temperature sensor 24 outputs a signal corresponding to the ambient temperature to the control unit 19. Based on the temperature at the recovery port 5 b detected by the temperature sensor 24, the control unit 19 controls the recovery pipe heater 22 and the sleeve heater 23 so that the molten metal being recovered does not solidify.

  The die casting machine 1 has an auxiliary plunger 33 used for various purposes such as pushing back the recovered molten metal to the recovery port 5b, and an auxiliary plunger driving 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 to have the same diameter and cross-sectional shape as the supply path SR (inner space of the sleeve 5 and the gate bush 11) and is continuous with the supply path SR. 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 order of a time series. Hereinafter, it demonstrates in order along FIGS.

  FIG. 1 shows a state in which molten metal is supplied to the sleeve 5 by the ladle 13. Before this state is reached, the control unit 19 first moves the injection plunger 7 to the original position P0 on the opposite side of the cavity Ca from the hot water supply port 5a. The original position P0 is, for example, a position where the front surface of the injection plunger tip 15 coincides with the end of the hot water supply port 5a opposite to the cavity Ca and the injection plunger tip 15 closes the recovery port 5b. Moreover, the control part 19 moves the auxiliary plunger 33 to the receiving position P11 of the hot water supply port 5a side rather than biscuit space BS.

  Next, the control part 19 pumps out the molten metal of a heat retention furnace with the ladle 13 by control of an arm etc. which is not shown in figure, and pours it into the hot water supply port 5a. As a result, the state shown in FIG. 1 is obtained. The ladle 13 is tilted to a predetermined angle to pour a certain amount (the amount used for one molding) of the molten metal into the hot water supply port 5a.

  Here, since the auxiliary plunger 33 is located closer to the hot water supply port 5a than the biscuit space BS, the molten metal is supplied to the hot water supply port 5a while the auxiliary plunger 33 remains in the original position P10 (FIG. 2). In comparison, the ratio (filling rate) of the amount of the molten metal used for one molding to the volume of the space between the auxiliary plunger 33 and the injection plunger 7 becomes high. In other words, the ratio of air in the space between the auxiliary plunger 33 and the injection plunger 7 is reduced. As a result, cooling of the molten metal and air entrainment when the injection plunger 7 moves forward are suppressed. The receiving position P11 is set so that the filling rate is 70 to 100%, for example. Such a receiving position P11 is calculated by the user or the control unit 19 based on, for example, information on the molded product, in other words, information on the mold 101.

  FIG. 2 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 the state of FIG. 2, 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.

  Further, the amount of hot water necessary and sufficient for one molding for determining the receiving position P11 based on the filling rate described above is the volume of the space (cavity Ca, gate Gt and runner Rn) between the divided surfaces of the mold 101, and the biscuit. This corresponds to the sum of the volume of the space BS, and 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. 3 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 recovery pipe 14 via the recovery port 5b, the molten metal in the biscuit space BS can be recovered into the recovery pipe 14. The injection plunger 7 is stopped at the original position P0, the auxiliary plunger 33 is stopped at the recovery position P12, and the recovery port 5b is positioned between the injection plunger 7 and the auxiliary plunger 33.

  The collection position P12 of the auxiliary plunger 33 is a position where, for example, a space having the same volume as the biscuit space BS is formed between the auxiliary plunger 33 and the injection plunger 7 located at the original position P0. The auxiliary plunger 33 closes the hot water supply port 5a at the collection position P12.

  Note that until the space between the auxiliary plunger 33 and the injection plunger 7 reaches the hot water supply port 5a, the molten metal does not leak out of the sleeve or the air is not caught. The injection plunger 7 may be pushed back by the auxiliary plunger 33 through the molten metal.

  FIG. 4 shows a state in which the molten metal is recovered in the recovery pipe 14. The molten metal between the auxiliary plunger 33 and the injection plunger 7 flows into the recovery pipe 14 by its own weight. Then, the molten metal in the recovery pipe 14 is at a liquid level equivalent to the liquid level in the heat retaining 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 retaining furnace or the like. Flow into.

  At this time, for example, an inert gas is supplied to the space between the auxiliary plunger 33 and the injection plunger 7 from a gas supply unit (not shown). Further, the recovery port 5b has a diameter-expanding 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 flows quickly into the recovery pipe 14 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. 5 shows a state where the mold is opened. Before this state is reached, the control unit 19 first moves the injection plunger 7 and the auxiliary plunger 33 to the cavity Ca side. The injection plunger 7 is stopped at the sealing position P2 that closes the hot water supply port 5a and the recovery port 5b. The auxiliary plunger 33 is stopped at the sealing position P13 located in the biscuit space BS. Accordingly, the inside of the sleeve 5 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 injection plunger 7 and the auxiliary plunger 33 are held at the positions shown in FIG. 6 to prevent the release agent and the like from entering the sleeve 5 and to dissipate heat inside the sleeve 5. In the next cycle, mold closing and mold clamping are performed, and the steps of FIGS. 1 to 6 are performed again. The auxiliary plunger 33 may be returned to the position in FIG. 1 either before or after mold closing.

  The recovery pipe heater 22, the sleeve heater 23, and the gate bush heater 25 may perform a heating operation over the entire process shown in FIGS. 1 to 6 or may be heated only in a specific process. . For example, the heater 25 for the spout bushing is from when filling of the molten metal into the cavity Ca from the sleeve 5 is started until the molten metal in the biscuit space BS starts to be pushed back toward the recovery port 5b (see FIGS. 2 and 3). 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. 1 and FIG. 2) 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 recovery port 5b until it is recovered in the recovery pipe 14 (see FIGS. 3 and 4). Also good.

  According to the above embodiment, the molten metal is supplied to the supply path SR from the hot water supply port 5a provided in the supply path SR communicating between the divided surfaces of the mold 101, and the injection plunger 7 is moved between the divided surfaces in the supply path SR. The cavity Ca is filled with the molten metal, and the cavity Ca is pressurized while applying pressure to the molding material of the cavity Ca by the injection plunger 7 through the molten metal in the communication portion (biscuit space BS) between the divided surfaces of the supply path SR. In which the molten metal in the cavity Ca is solidified while the molten metal in the biscuit space BS is in a molten state, and the molten metal in the biscuit space BS is provided in the supply path SR separately from the hot water inlet 5a. By collecting from the collected recovery port 5b, in addition to the effect of suppressing the waste of the material without solidifying the molten metal in the biscuit space BS, the molten metal is simply recovered to the hot water supply port. It is possible to obtain various effects as compared to the case. For example, the hot water supply port 5a is provided on the upper surface of the sleeve 5, in other words, the hot water supply port 5a allows the molten metal to flow into the sleeve 5 due to the weight of the molten metal, and from the hot water supply port 5a. Even when it is difficult to recover the molten metal, the molten metal can be recovered. As a result, for example, the molten metal recovery technique can be applied to a ladle-type cold chamber die casting machine that is generally used. Further, it is easy to perform a process such as filtering the molten metal before returning to the heat-retaining furnace.

  The die casting machine 1 constitutes a portion where the injection plunger 7 of the supply path SR slides, extends in the horizontal direction, has a hot water supply port 5a opened on the upper surface, and is collected on the lower surface and on the opposite side of the hot water supply port 5a from the cavity Ca. The opening 5b has a sleeve 5 that is open, and the control unit 19 is located at a position where the injection plunger tip 15 is opposite to the cavity Ca from the hot water supply port 5a and closes the recovery port 5b. After the molten metal is supplied from the hot water supply port 5a to the supply path SR and the molten metal is solidified, the injection plunger 7 is moved backward from the recovery port 5b to the side opposite to the cavity Ca, and the molten metal in the biscuit space BS flows into the recovery port 5b. Since the injection plunger drive unit 9 is controlled as described above, the inflow from the hot water supply port 5a and the outflow to the recovery port 5b can be controlled only by the position control of the injection plunger 7. Formation is simple.

  The die-casting machine 1 has an auxiliary plunger 33 that faces the injection plunger 7 in the sleeve 5 and an auxiliary plunger drive unit 35 that drives the auxiliary plunger 33. The control unit 19 is configured such that the injection plunger chip 15 is connected to the hot water inlet 5a. The supply path SR from the hot water supply port 5a when the auxiliary plunger 33 is positioned on the cavity Ca side with respect to the hot water supply port 5a. The molten metal in the cavity Ca is solidified while applying pressure to the molten metal in the cavity Ca through the molding material in the biscuit space BS with the auxiliary plunger 33 facing the injection plunger 7 across the biscuit space BS. The auxiliary plunger 33 is moved to the opposite side of the cavity Ca, and the biscuit space BS Since the injection plunger driver 9 and the auxiliary plunger driver 35 are controlled so as to push the molten metal back to the position of the recovery port 5b, the inflow from the hot water supply port 5a and the recovery port 5b are controlled only by the position control of the injection plunger 7 described above. In addition to the effect of controlling the outflow, the auxiliary plunger 33 can reliably recover the molten metal in the biscuit space BS from the recovery port 5b.

  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, and the biscuit space BS is an example of the communication portion 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.

  The heater that heats the molding material of the communication portion (in the embodiment, the biscuit space BS) 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 so that the recovery port is on the lower side, the molding material in the biscuit space can be recovered from the recovery port by its own weight.

  The supply of the molten metal to the supply port is not limited to that performed by a ladle. For example, the molten metal is sent to the supply port by an electromagnetic pump, a mechanical pump, a pneumatic mechanism, or the like via a supply pipe connected to the supply port. It may be done. Further, when performed by a ladle, the ladle is not limited to one that pumps molten metal from a heat-retaining furnace. For example, the molten metal may be poured from a melting furnace that melts an amount of metal material necessary for one molding for each casting.

  The position of the plunger tip of the injection plunger when the molding material is supplied from the supply port to the sleeve is not limited to the position where the recovery port is closed, and may be a position on the cavity side of the recovery port.

Sectional drawing which shows the principal part of the die-casting machine of embodiment of this invention in the state which is supplying the molten metal to a 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, 5a ... Hot water supply port, 5b ... Recovery port, 7 ... Injection plunger, 9 ... Injection plunger drive part, 19 ... Control part, 101 ... Mold (mold), Ca ... Cavity, BS ... Biscuit space (communication part).

Claims (6)

A molten molding material is supplied to the supply path from a supply port provided in a supply path that communicates between the split surfaces of the mold, and an injection plunger is advanced to the side between the split surfaces in the supply path. The cavity between the divided surfaces is filled, and the molding material of the cavity is solidified while applying pressure to the molding material of the cavity by the injection plunger through the molding material of the communication path between the divided surfaces. A molding method,
While keeping the molding material of the communication part in a molten state,
Solidifying the molding material of the cavity,
A molding method in which the molding material of the communication part is recovered from a recovery port provided in the supply path separately from the supply port. An injection plunger capable of sliding on a supply path communicating between the divided surfaces of the mold;
An injection plunger drive unit for driving the injection plunger;
The molten molding material supplied to the supply path from the supply port provided in the supply path is advanced into the cavity between the divided surfaces by advancing the injection plunger, and between the divided surfaces of the supply path. A control unit for controlling 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 by the injection plunger through the molding material of the communication part of
Have
While keeping the molding material of the communication part in a molten state,
Solidifying the molding material of the cavity,
A molding machine that collects the molding material of the communication portion from a recovery port provided in the supply path separately from the supply port. The portion of the supply passage where the injection plunger slides is formed, extends in a horizontal direction or a direction inclined in the horizontal direction, the supply port opens on the upper surface, and the lower surface and the side opposite to the cavity from the supply port Having a sleeve with the recovery port open,
The controller is
In the state where the plunger tip of the injection plunger is on the opposite side of the cavity from the supply port and closes the recovery port or on the cavity side of the recovery port, the plunger tip Molding material is supplied to the supply path,
After the molding material is solidified, the injection plunger drive unit is controlled so that the injection plunger is retracted to the opposite side of the cavity from the recovery port, and the molding material of the communication portion is recovered by the recovery port. The molding machine according to claim 2. An auxiliary plunger facing the injection plunger in the sleeve;
An auxiliary plunger drive unit for driving the auxiliary plunger;
Have
The controller is
The plunger tip of the injection plunger is located on the opposite side of the cavity from the supply port and closes the recovery port or on the cavity side of the recovery port, and the auxiliary plunger is the supply The molding material is supplied from the supply port to the supply path in a state of being located on the cavity side from the port,
In a state where the auxiliary plunger faces the injection plunger across the communication portion, the molding material of the cavity is solidified while applying pressure to the molding material of the cavity via the molding material in the communication portion,
The said injection plunger drive part and the said auxiliary plunger drive part are controlled so that the said auxiliary plunger may be moved to the opposite side to the said cavity, and the molding material of the said communication part may be pushed back to the position of the said collection port. Molding machine. The molding machine according to claim 3, further comprising a ladle that supplies a molten molding material to the supply port. It is a cold chamber die-casting machine. The molding machine of any one of Claims 2-5.

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