JP2009050855A - Casting apparatus and casting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casting apparatus and a casting method, wherein dies can efficiently and quickly be heated up to a desired temperature and the yield of a casting product can be improved. <P>SOLUTION: The casting apparatus has a fixed die and a movable die 5, and a plurality of penetrating pins 33 disposed so as to be inserted, and protruding holes passing through the movable die 5, are included. The movable die 5 is provided with heating-up circuits 63, 64 and the protruding pins 33 is provided with the heating-up circuits 71. A retainer plate 72 and an ejector plate which hold the base end parts 33b of the protruding pins 33, are heated up by causing high temperature oil to flow into the heating-up circuits 71, so as to indirectly heat-up the protruding pins 33. Thus, the dies including the movable die 5, are efficiently heated up. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a casting apparatus and a casting method for casting a casting, and more particularly to a casting apparatus and a casting method for forming a molded product such as a thin metal case of 1.0 [mm] or less.

  Generally, a casting apparatus includes a fixed mold and a mold having a movable mold provided to be separable from the fixed mold, a mold clamping device for clamping the mold, a clamped fixed mold, and a movable mold. And an injection device that press-fits the molten metal into an internal space formed between the two and a protruding pin that protrudes the molded product from the mold by separating the movable mold from the fixed mold. The mold has a temperature control circuit extending through the mold, and by flowing high temperature oil through the temperature control circuit, the temperature of the mold surface on the surface is made as close as possible to the temperature of the molten metal. The temperature is raised.

  However, there is a limit to raising the surface temperature of the mold so as to approach the temperature of the molten metal. For example, the temperature of the molten molten Mg is close to 700 ° C., whereas the temperature of the oil flowing through the temperature control circuit Is limited to 300 [° C.], and an actual mold can only raise its surface temperature to about 200 [° C.]. In particular, since the temperature control circuit (oil flow path) can be formed only at a position avoiding the protrusion hole through which the protrusion pin is inserted, the temperature near the protrusion hole is lowered. Since the end face of the protrusion hole is exposed in the internal space, insufficient temperature rise near the protrusion hole becomes an obstacle when the temperature of the mold surface defining the internal space of the mold is raised.

  In recent years, the demand for thin molded articles of 1.0 [mm] or less is increasing. When casting a thin molded product in this way, if the surface temperature of the mold is significantly lower than the temperature of the molten metal as described above, the molten metal is rapidly cooled and the flow length in the internal space is shortened. The phenomenon that the molten metal locally solidifies before it reaches every corner of the internal space. In this case, the shape of the molded product does not become a desired shape and becomes a defective product. That is, when the surface temperature of the mold cannot be effectively increased to a desired temperature, the yield of the molded product is lowered.

  On the other hand, as a technique for controlling the temperature of the ejection pin, a technique is known in which the ejection pin is cooled after being ejected from a mold (see, for example, Patent Document 1). According to the method disclosed in this publication, the protrusion pin is cooled to prevent galling between the molds.

However, if the protruding pin is cooled in this way, as described above, the surface temperature of the mold is further lowered, and the yield of the molded product is lowered.
JP2003-112245 (paragraph [0007])

  An object of the present invention is to provide a casting apparatus and a casting method that can raise the mold effectively and quickly to a desired temperature and improve the yield of molded products.

  In order to achieve the above object, a casting apparatus of the present invention includes a fixed mold and a mold having a movable mold combined in a separable manner with respect to the fixed mold, and clamping the fixed mold and the movable mold between them. In order to project a molded product formed by press-fitting molten metal into the internal space formed from the mold, the molded product is slidably inserted into a projecting hole extending from the outside of the mold to the internal space. A protruding pin, a first temperature raising means for raising the temperature of the mold, and a second temperature raising means different from the first temperature raising means for raising the temperature of the protruding pin, Have.

  The casting method of the present invention raises the temperature of a fixed mold and a mold having a movable mold combined with the fixed mold so as to be detachable from the fixed mold, and is slidable in an ejection hole formed in the mold. The temperature raising step of raising the temperature of the protruding pin inserted and arranged separately from the mold, and the protruding pin heated in this temperature raising step is inserted and arranged in the protruding hole and the temperature rising step A molding process for molding a molded product by clamping the fixed mold and the movable mold of the mold heated separately from the protruding pin and press-fusing molten metal into an internal space formed therebetween, and the fixed mold And a projecting step of sliding the projecting pin inserted and disposed in the projecting hole while separating the movable mold and projecting the molded product molded in the molding process from the mold.

  According to the above invention, in addition to raising the temperature of the mold so as to approach the temperature of the molten metal, the temperature of the protruding pin inserted through the protruding hole of the mold is also increased. Compared with the case where only the temperature is raised, the mold can be efficiently heated to the desired temperature in a short time, and the problem that the molten metal is cooled before reaching every corner of the internal space can be prevented. In addition, molding defects can be reduced, and the yield of molded products can be improved.

  According to the casting apparatus and the casting method of the present invention, the mold can be effectively and quickly heated to a desired temperature, and the yield of molded products can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a die casting die 1 by a cold chamber method as a configuration of a main part of a casting apparatus according to an embodiment of the present invention. FIG. 1 shows, as an example, a mold 1 for casting a part of a casing of a portable computer. The casting apparatus according to the embodiment of the present invention includes an extruding pin, an injection apparatus, a mold clamping apparatus, and a temperature raising means, which will be described later, in addition to the mold.

  FIG. 2 shows a molded product 2 cast by the mold 1 of FIG. As shown in FIG. 2, an example of the molded product 2 is a housing base that is a part of the housing of the portable computer. However, the mold and the molded product to which the present invention can be applied are not limited to this, and can be applied to a mold for casting various molded products including a housing cover, for example. The molded product 2 is made of a magnesium alloy, for example, and is an ultra-thin molded product having a basic thickness of 0.6 mm or less. The “basic wall thickness” refers to the thickness most widely adopted in the molded product.

  As shown in FIG. 1, the mold 1 has a fixed mold 4 and a movable mold 5. The fixed mold 4 is fixed to a fixed plate (not shown). The fixed mold 4 includes a fixed mold plate 11, a cavity member 12, and a casting port member 13. The fixed mold plate 11 is fixed to the fixed platen and has a recess (not shown) to which the cavity member 12 is attached on the surface facing the movable mold 5. The cavity member 12 of the present embodiment is formed in a substantially rectangular block shape by alloy tool steel (for example, SKD61), and is attached to the concave portion of the fixed mold plate 11 and has a not-shown facing surface facing the movable mold 5. Have. On the opposing surface of the cavity member 12, for example, a mold surface (not shown) having a shape corresponding to the front side 2a (see FIG. 1) of the molded product 2 is formed.

  The casting port member 13 is formed in a substantially cylindrical shape, and an injection plunger (not shown) of the injection device is inserted therein. The stationary template 11 has an opening 11a to which the casting port member 13 is attached. The cavity member 12 has a notch 12 a that avoids the casting port member 13. The casting port member 13 is attached along the opening 11a of the fixed mold plate 11 and the notch 12a of the cavity member 12, and from the lower surface of the fixed mold 4 (that is, the surface on the movable mold 5 side) to the upper surface (that is, the fixed platen side). ).

  The casting port member 13 includes a first end 14 that contacts the movable mold 5 and a connecting end that is provided on the opposite side of the first end 14 and is a second end exposed on the fixed platen side. 15. The connecting end 15 is connected to a sleeve (not shown) of the injection device.

  On the other hand, the movable mold 5 includes a movable mold plate 21, a core member 22, and a diverter 23. The movable mold 5 is fixed to a movable plate (not shown), and a mold closing position where the mold is clamped in combination with the fixed mold 4, and a mold separated from the fixed mold 4 in order to take out the molded product 2 from the mold 1. It can be moved back and forth between the open position.

  The movable mold plate 21 is fixed to the movable platen, and has a recess 21 a in which the core member 22 is attached to a surface 210 facing the fixed mold 4. The core member 22 of the present embodiment is formed in a substantially rectangular block shape by alloy tool steel (for example, SKD61), is attached to the concave portion 21a of the movable mold plate 21, and has a facing surface 22a facing the fixed mold 4. Have. In addition, a mold surface 22 b having a shape corresponding to the back side of the molded product 2 is formed on the facing surface 22 a of the core member 22, for example.

  The diverter 23 faces the casting port member 13 described above and abuts on the casting port member 13. The diverter 23 is provided for diverting the molten metal and controlling the filling amount in accordance with the shape to be cast.

  FIG. 3A schematically shows the facing surface 22 a of the core member 22 attached to the concave portion 21 a of the movable mold 21. FIG. 3B is a schematic side view of the core member 22 as viewed from the side. When the mold surface of the fixed mold 4 and the mold surface 22b of the movable mold 5 are aligned with each other, the fixed mold 4 and the movable mold 5 are surrounded by the mold surface on the fixed mold 4 side and the mold surface 22b on the movable mold side. A formed internal space (cavity) is formed.

  FIG. 4 schematically shows the internal space 41. The internal space 41 includes a biscuit portion 43, a gate portion 44, a product portion 45, an overflow portion 46, and a chill belt portion 47. The biscuit portion 43 is a portion that is provided inside the casting port member 13 and receives high-temperature molten metal at a high speed from the injection device.

  The gate portion 44 is a flow path that guides the molten metal injected into the biscuit portion 43 to the product portion 45, and is formed in a fin shape, for example. The product portion 45 is a space corresponding to the product shape, and an arbitrary product shape can be obtained by filling the molten metal into the space. The overflow part 46 is a part for exhausting the air in the mold 1 to lower the filling resistance of the molten metal and for pushing out the molten metal with a deteriorated flow tip to the outside of the product part 45. The chill belt portion 47 is a portion that prevents the deteriorated molten metal from jumping out of the mold 1.

  When such a mold 1 is used, a biscuit 51 corresponding to the biscuit portion 43, a gate portion 52 corresponding to the gate portion 44, and a product portion 53 corresponding to the product portion 45 are integrated as shown in FIG. The casting 31 molded into the product is obtained. The biscuits 51 are formed in a cylindrical shape depending on the inner diameter of the sleeve of the injection device, and have a diameter of about 70 mm to 100 mm, for example. The biscuit 51 has a role as a buffer part that reduces the impact when the injection plunger that moves forward at high speed stops, and a role as an adjustment part that adjusts the difference in the amount of molten metal supplied for each cycle. Requires a thickness of about.

  Returning to FIG. 3A, a plurality of protruding pins 33 are provided on the mold surface 22 b of the core member 22 of the movable mold 5, particularly on the product surface 32 that defines the surface side of the product portion 45 of the internal space 41 described above. A plurality of substantially circular openings 32a are formed, each exposing the tip 33a. As shown in FIG. 3 (b), each protruding pin 33 is slidably inserted into a plurality of protruding holes 34 extending through the movable mold plate 21 and the core member 22 of the movable mold 5 described above. ing. In addition, the protrusion pin 33 of this Embodiment is formed with alloy tool steel (for example, SKD61).

  That is, each protrusion pin 33 is inserted into the protrusion hole 34 and slid, so that its tip 33 a protrudes from the product surface 32 to the internal space 41 through the opening 32 a at one end of the protrusion hole 34. ing. Thereby, in the state where the movable mold 5 is moved to the mold opening position described above, the cast product 31 on the mold surface 22b of the core member 22 can be ejected by the tips 33a of the plurality of ejection pins 33.

  Each protruding pin 33 has an elongated cylindrical shape, and the protruding hole 34 is slidably inserted through the protruding pin 33 through a slight gap. The gap between the protruding hole 34 and the protruding pin 33 is designed so as not to cause galling in a state where both are thermally expanded. Further, the base end portions (not shown in FIG. 3) of the plurality of protruding pins 33 are held by a retainer plate and an ejector plate, which will be described later, and are driven by moving the holding member in the longitudinal direction of the protruding pins 33. . Here, a detailed description of the moving mechanism of the ejection pin 33 is omitted.

  By the way, it is desirable that the mold 1 is always heated to, for example, nearly 300 degrees for the purpose of delaying solidification of the molten metal. As shown in FIG. 1, the mold 1 is provided with temperature raising circuits 61, 62, 63, 64 for raising the temperature of the mold 1. The temperature raising circuits 61, 62, 63 and 64 are flow paths through which high temperature oil flows. That is, high-temperature oil circulated between the heating circuits 61, 62, 63, and 64, which are respectively provided with a heating device (not shown) provided in the casting device, is flown ideally. It functions to maintain a high temperature of about 300 degrees.

  However, in practice, the temperature of the oil supplied from the heating device is limited to about 300 [° C.], and the mold 1 is raised only by the temperature raising circuits 61, 62, 63, 64. When heated, the mold 1 is limited to being heated to about 200 [° C.]. The temperature raising circuits 61, 62, 63, 64 and the heating device function as the first temperature raising means of the present invention.

  More specifically, as shown in FIG. 1, the temperature raising circuit 61 on the fixed mold 4 side extends into the inside of the fixed mold 11 from the opening portion 11 b opened on the side surface 11 a of the fixed mold 11. The heat of hot oil passing through the circuit 61 is transmitted to the fixed mold plate 11 to raise the temperature of the fixed mold plate 11. The temperature raising circuit 62 is provided so as to extend from the opening 11c opened in the side surface 11a of the fixed mold plate 11 to the inside of the cavity member 12, and the heat of the hot oil passing through the temperature raising circuit 62 is transferred to the cavity member. Then, the temperature of the cavity member 12 is raised.

  On the other hand, one temperature raising circuit 63 provided on the movable mold 5 side is provided so as to extend from the opening portion 21 c opened in the side surface 21 b of the movable mold plate 21 to the inside of the core member 22. The core member 22 is heated by transferring the heat of the hot oil passing through the core member 22 to the core member 22. Further, the temperature raising circuit 64 extends into the movable mold plate 21 from an opening 21d opened on the side surface 21b of the movable mold plate 21, and the heat of the hot oil passing through the temperature raising circuit 64 is transferred to the movable mold plate 21. The temperature of the movable mold plate 21 is increased by transmitting to.

  In FIG. 3, a part of the temperature raising circuit 63 for raising the temperature of the core member 22 of the movable mold 5 (that is, only the oil flow path passing through the inside of the core member 22) is indicated by a broken line. For example, as shown in FIG. 6, high-temperature oil supplied from the heating device of the first temperature raising means is supplied to the core member 22 through the temperature raising circuit 63 of the movable mold plate 21, and the side surface 22 c of the core member 22. It flows into the core member 22 from the inlet 63a at one end of the temperature raising circuit 63. The oil that has flowed into the core member 22 flows through the temperature raising circuit 63 passing through the core member 22 and the movable mold plate 21, and passes through the outlet 63 b at the other end of the temperature raising circuit 63 formed on the side surface 22 c of the core member 22. And is discharged from the core member 22. Further, the oil discharged from the outlet 63b of the core member 22 is returned to the heating device through the temperature raising circuit 63 of the movable mold plate 21. The other opening 63c of the temperature raising circuit 63 formed on the side surfaces 22c and 22d of the core member 22 functions as a communication port for transferring oil to and from the temperature raising circuit 63 on the movable mold plate 21 side. .

  As described above, the movable mold plate 21 and the core member 22 of the movable mold 5 are formed with a plurality of projecting holes 34 for inserting and arranging a plurality of projecting pins 33. The temperature raising circuits 63 and 64 for raising the temperature must be formed at positions that do not interfere with the protruding holes 34. The distance between the temperature raising circuits 63 and 64 and the projecting hole 34 needs to be 5 to 7 [mm] at a minimum, and is ideally approximately an intermediate position between the two temperature raising circuits 63 extending adjacent to each other. It is desirable to set the positional relationship between the temperature raising circuit 63 and the protruding hole 34 so that the protruding hole 34 passes through. That is, when the protruding hole 34 and the temperature raising circuit 63 are positioned in this manner, the temperature of the movable mold 5 near the protruding hole 34 between the temperature raising circuits 63 becomes the lowest.

  For this reason, in this embodiment, in order to enhance the temperature rise effect in the vicinity of the protruding hole 34 extending through the movable mold 5 (hereinafter, the movable mold plate 21 and the core member 22 are collectively referred to as the movable mold 5), The protrusion pin 33 inserted and disposed in the protrusion hole 34 is heated. In the following description, the configuration for assisting the temperature rise of the movable mold 5 will be described as a representative. However, it is also possible to assist the temperature rise of the fixed mold 4 by inserting the protruding pin 33 on the fixed mold 4 side. .

  FIG. 7 shows a temperature raising circuit 71 for raising the temperature of the protrusion pin 33. The temperature raising circuit 71 functions as a second temperature raising means of the present invention for indirectly raising the temperature of the plurality of protruding pins 33.

  As shown in FIG. 7, the base end portion 33 b of each protruding pin 33 is held by a retainer plate 72 and an ejector plate 74. A cylindrical flange portion 33c having a large diameter is formed integrally with the base end portion 33b of each protruding pin 33. The retainer plate 72 is configured to receive a substantially circular hole 73a having a size that allows the protrusion pin 33 to be slidably inserted therein, and a pin flange portion 33c that is coaxial with the hole 73a and has a larger diameter than the hole 73a. A stepped hole 73 comprising a hole 73b is formed through the plate.

  Each protruding pin 33 is inserted from the large diameter side of the stepped hole 73 of the retainer plate 72, and a flange portion 33c provided at the base end portion 33b is locked by a stepped portion 73d between the hole 73a and the hole 73b. It is retained by this. And the ejector plate 74 is attached so that it may overlap with the retainer plate 72 so that the base end part 33b of the protrusion pin 33 may be plugged up. That is, the base end portion 33 b of each protrusion pin 33 is held by the two plates 72 and 74 in an exchangeable manner and is in contact with the two plates 72 and 74, respectively. In order to increase heat transfer efficiency, a lubricant or the like may be interposed in the contact portion between the two plates 72 and 74 and the protruding pin 33.

  By the way, the retainer plate 72 is moved by a moving mechanism (not shown) when the tip 33a of the protruding pin 33 is retracted to a position where it does not protrude from the mold surface 22b of the movable mold 5. The ejector plate 74 cooperates with the retainer plate 72 to hold the base end portion 33b of the ejector pin 33, and the tip 33a of the ejector pin 33 projects from the mold surface 22b so that the casting 31 is removed from the mold surface 22b. When removing, it is moved by a moving mechanism (not shown). That is, the two plates 72 and 74 are moved integrally by the moving mechanism. These two plates 72 and 74 function as a holding member of the present invention.

  The retainer plate 72 and the ejector plate 74 are provided with a temperature raising circuit 71. This temperature raising circuit 71 is also a flow path for circulating high-temperature oil, like the temperature raising circuits 61, 62, 63, 64 described above, and extends through the inside of each plate 72, 74. Not connected to the heating device. That is, the temperature raising circuit 71 functions to raise the temperature of the two plates 72 and 74.

  As described above, since the two plates 72 and 74 hold the base end portion 33b of each protruding pin 33 in contact with each other, the temperature of the two plates 72 and 74 is raised by the temperature raising circuit 71. Thus, the temperature of the plurality of protruding pins 33 can also be increased. Thus, by raising the temperature of the plurality of protruding pins 33 separately from the movable die 5, the temperature of the entire mold 1 can be effectively raised as compared with the case where only the movable die 5 is heated. Thus, the flow length of the molten metal can be lengthened, the cast product 31 of good quality can be cast, and the yield of the molded product 2 can be increased.

Next, a manufacturing method of the molded product 2 by die casting using the mold 1 described above will be described with reference to the flowchart of FIG.
First, a casting apparatus provided with the above-described mold 1 is prepared. At this time, as shown in Step 1 in FIG. 8, the mold 1 causes the high temperature oil to flow through the temperature raising circuits 61, 62, 63, 64 and the high temperature oil to flow through the temperature raising circuit 71 in a separate system. Thus, the temperature is raised to about 300 degrees. As described above, since the temperature of the protrusion pin 33 is raised by the temperature raising circuit 71 at this time, the time required for raising the temperature of the mold 1 to a desired temperature can also be shortened. On the other hand, a raw material metal (for example, magnesium alloy) is melted to prepare a molten metal. The temperature of the molten metal is, for example, 700 [° C.].

  The molding cycle shown as step 2 is then entered. First, the movable mold 5 moves and is combined with the fixed mold 4 and clamped. Next, molten metal is injected from the injection device into the mold 1 through a sleeve (not shown) connected to the casting port member 13, the injection plunger is pushed out at a high speed, and the molten metal is filled into the mold 1 from the casting port member 13. To do. At this time, the temperature of the mold 1 is raised and the temperature of the protruding pin 33 inserted through the protruding hole 34 is also raised, so that the temperature drop of the molten metal is suppressed, and the molten metal passes through the gate portion 44. The product part 45 is filled. At this time, since the basic thickness of the product portion 53 is, for example, 0.6 mm or less, the molten metal rapidly solidifies after filling.

  After the molten metal is solidified, as shown in step 3, the movable mold 5 moves to the mold opening position to open the mold, and the casting 31 including the product portion 53 is taken out from the mold 1. At this time, the two plates 72 and 74 holding the protrusion pin 33 are moved by a moving mechanism (not shown), and the casting 31 is protruded from the mold surface 22 b of the movable mold 5 by the tips 33 a of the plurality of protrusion pins 33. . This completes one cycle of die casting.

  In the cast product 31 taken out from the mold 1, unnecessary parts including the biscuit 51 and the gate portion 52 are separated from the product portion 53, and the desired molded product 2 is obtained. According to the mold 1 having such a configuration, the castability of a thin molded product is improved.

  As described above, according to the present embodiment, when the temperature of the mold 1 is raised, the temperature raising circuit 61 for raising the temperature of the fixed mold 11 and the temperature raising circuit 62 for raising the temperature of the cavity member 12. Two pieces of high-temperature oil are circulated through a temperature raising circuit 63 for raising the temperature of the core member 22 and a temperature raising circuit 64 for raising the temperature of the movable mold plate 21 and a plurality of protruding pins 33 are held. Since the high temperature oil is circulated through the temperature raising circuit 71 for raising the temperature of the plates 72 and 74, the temperature rise shortage in the vicinity of the protruding hole 34 can be resolved, and the temperature of the entire mold 1 can be raised effectively. Can do. That is, according to the present embodiment, the flow length of the molten metal press-fitted into the internal space 41 of the mold 1 can be increased, the high-quality cast product 31 can be cast, and the yield of the molded product 2 can be improved.

  9 and 10 show examples of arrangement of the heaters 81 and 82 for heating the protrusion pin 33 directly to raise the temperature. These heaters 81 and 82 are arranged in contact with the base end portion 33b of the protruding pin 33, and function as a second temperature raising means of the present invention for directly heating the protruding pin 33.

  In the example shown in FIG. 9, individual heaters 81 are arranged for each of the plurality of protruding pins 33. In this case, a counterbore part 74a is provided at a portion where the ejector plate 74 faces the base end part 33b of the protruding pin 33, and one heater 81 is accommodated in the counterbore part 74a.

  Further, in the example shown in FIG. 10, only one combined heater 82 is disposed on the plurality of protruding pins 33. In this case, a counterbore portion 74b is provided on the surface of the ejector plate 74 facing the retainer plate 72, and only one dual-purpose heater 82 is accommodated in the counterbore portion 74b.

  In any case, by arranging the heaters 81 and 82 for directly heating the ejection pin 33, the same effect as the above-described embodiment can be obtained, and the effect of raising the ejection pin 33 to a higher temperature can be achieved. I can expect.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the component covering different embodiment suitably.

  For example, in the above-described embodiment, the case where the temperature of the protrusion pin 33 is raised in order to enhance the temperature raising effect of the mold 1 is described. However, the present invention is not limited to this, and the mold 1 is in direct or indirect contact. You may make it raise another member's temperature. As the member that contacts the mold 1, for example, a fixed plate for fixing the fixed die 4, a casting port member 13, a movable plate for fixing the movable die 5, a diverter 23, or the like can be considered.

The disassembled perspective view which shows the metal mold | die integrated in the casting apparatus which concerns on embodiment of this invention. The perspective view which shows an example of the molded product shape | molded using the metal mold | die of FIG. The top view (a) which shows the type | mold surface of the core member integrated in the movable mold of the metal mold | die of FIG. 1, and the side view (b) of a core member. The schematic diagram which shows the internal space of the metal mold | die of FIG. FIG. 5 is a perspective view schematically showing a cast product cast in the internal space of FIG. 4. The figure for demonstrating the distribution route of the oil which flows through the temperature rising circuit of the core member of FIG. The schematic diagram which shows the temperature rising circuit which heats up the protrusion pin which protrudes a casting from the metal mold | die of FIG. The flowchart for demonstrating the casting method using the metal mold | die of FIG. The figure for demonstrating the example of arrangement | positioning of the heater for heating a protrusion pin directly. The figure for demonstrating another example of arrangement | positioning of the heater for heating a protrusion pin directly.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Mold, 2 ... Molded article, 4 ... Fixed mold, 5 ... Movable mold, 22 ... Core member, 22b ... Mold surface, 33 ... Extrusion pin, 34 ... Extrusion hole, 72 ... Retainer plate, 74 ... Ejector plate, 81, 82 ... heaters.

Claims (7)

A mold having a fixed mold and a movable mold combined in a separable manner with respect to the fixed mold;
In order to project a molded product formed by clamping the fixed mold and the movable mold and press-fitting molten metal into the internal space formed between the mold and the outer space, the mold penetrates from the outside of the mold to the internal space. A projecting pin that is slidably inserted into a projecting hole that extends,
First temperature raising means for raising the temperature of the mold;
A second temperature raising means different from the first temperature raising means for raising the temperature of the protruding pin;
The casting apparatus characterized by having.   2. The casting apparatus according to claim 1, wherein the second temperature raising means raises the temperature of a proximal end portion of the protruding pin protruding from the protruding hole to the outside of the mold.   3. The casting according to claim 2, wherein the second temperature raising means has a heater disposed in contact with a base end portion of the protruding pin protruding from the protruding hole to the outside of the mold. apparatus.   The second temperature raising means includes a temperature raising circuit that raises the temperature of a holding member that holds a proximal end portion of the protruding pin protruding from the protruding hole to the outside of the mold. The casting apparatus described in 1. The mold having a fixed mold and a movable mold combined with the fixed mold so as to be detachable from the fixed mold is heated, and an ejection pin that is slidably inserted in an ejection hole formed in the mold is inserted into the mold A temperature raising step for raising the temperature separately from the mold;
The protruding pin heated in the temperature raising step is inserted and disposed in the protruding hole, and the fixed mold and the movable die of the mold heated separately from the protruding pin in the temperature rising step are molded. A molding process for molding a molded product by press-fitting molten metal into an internal space formed between the two,
A projecting step of sliding the projecting pin inserted and disposed in the projecting hole by separating the fixed mold and the movable mold, and projecting the molded product molded in the molding process from the mold;
A casting method characterized by comprising:   6. The casting method according to claim 5, wherein, in the temperature raising step, the protrusion pin is directly heated at a portion that does not interfere with the protrusion hole and the internal space.   6. The heating pin is heated indirectly by heating another member that is in contact with the protruding pin at a portion that does not interfere with the protruding hole and the internal space. The casting method described in 1.

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