JP2008272796A - Die, method for manufacturing formed product, and formed product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die improving the castability of a thin formed product. <P>SOLUTION: The die 1 for casting a die cast product is provided with: a fixed die 4; a movable die 5 assembled with the fixed die 4; a pouring hole member 13 arranged in the fixed die 4 and provided with a connecting end part 15 connected with a sleeve 18 of a casting machine; and a region 69 where a biscuit is formed at the casting time; and a cooling circuit 71 provided with a flowing passage 77 for flowing liquid cooling medium and for cooling the biscuit 51 formed in the pouring hole member 13 at the casting time. The cooling circuit 71 is arranged along a region between the connecting end part 15 and the region 69 where the biscuit is formed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique related to die casting.

  The die for die casting by the cold chamber method has a fixed mold and a movable mold combined with the fixed mold. The fixed mold is provided with a casting port member. The casting port member is a portion where a sleeve of a casting machine is connected and molten metal (hereinafter, molten metal) is introduced into a mold. After casting, a starting point of a gate called a biscuit remains in the casting port member. The biscuits have a role as a buffer part that reduces the impact when stopping the injection plunger that moves forward at high speed, and a role as an adjustment part that adjusts the difference in the amount of molten metal supplied for each cycle, for example, about 20 mm. Requires a thickness of.

  In recent years, for example, a thin molded product having a thickness of 1.0 mm or less has been desired. In casting such a thin molded product, the solidification of the product portion proceeds in a very short time when the molten metal is filled, while the biscuits are difficult to solidify due to the thick wall. Here, when waiting for the biscuit to solidify, the thin product portion is excessively solidified and contracts and bites into the mold.

  Therefore, the present inventor has considered providing a cooling circuit through which cooling water flows along the outer peripheral surface of the casting port member so as to surround the region where the biscuit is formed, thereby cooling the biscuit. Thereby, solidification of the biscuits is promoted, and the cast product can be taken out from the mold before the product portion bites into the mold.

Here, Patent Document 1 discloses a die casting apparatus including a cooling device. This die casting apparatus includes a mold, an injection apparatus, and a cooling apparatus having a cooling liquid path. The cooling device is attached to the outer surface of the sleeve of the injection device. Thereby, the hot water receiving portion of the sleeve is cooled.
Japanese Patent Laid-Open No. 2005-34867

In recent years, a thinner molded product is desired. For example, an ultra-thin molded product having a thickness of 0.6 mm or less is desired. When the cooling circuit is arranged so as to surround the region where the biscuits are molded as described above, the temperature of the molten metal is reduced to some extent when the molten metal is poured into the mold. When casting a product, the castability is extremely seriously affected. That is, if the temperature of the molten metal is greatly lowered, the fluidity of the molten metal is impaired accordingly, and the molded product cannot be cast into a desired shape.
Moreover, when a sleeve is cooled like patent document 1, a molten metal will be cooled in a sleeve and the fluidity | liquidity of a molten metal will fall.

  The objective of this invention is providing the metal mold | die which improved the castability of the thin molded article.

  Another object of the present invention is to provide a method for producing a molded product with improved castability of a thin molded product.

  Another object of the present invention is to provide a molded product by a casting method with improved castability of a thin molded product.

  In order to achieve the above object, a die casting mold according to an embodiment of the present invention is provided with a fixed mold, a movable mold combined with the fixed mold, a fixed mold, and a sleeve of the casting machine. A casting port member having a coupling end portion to be coupled and a region in which a biscuit is molded at the time of casting; and a cooling circuit that has a flow path through which a liquid refrigerant flows and that cools the biscuit molded to the casting port member at the time of casting. It has. The cooling circuit is provided along a region between the connection end of the casting port member and a region where the biscuit is formed.

  In order to achieve the above-mentioned other object, in a method for manufacturing a molded product according to one embodiment of the present invention, a biscuit is formed in a casting port member during casting, and the cast product is taken out from the mold after the biscuit is solidified. A method of manufacturing a molded product by die casting, wherein the casting port member includes a connecting end portion to which a sleeve of a casting machine is connected and a region in which the biscuit is molded, and the biscuit is cooled during casting. Solidification is promoted, and cooling of the biscuits is performed by cooling a region between the connection end portion of the casting port member and a region where the biscuits are formed.

  In order to achieve the other object, a molded product according to one embodiment of the present invention is formed by die casting in which a biscuit is formed in a casting port member at the time of casting, and the biscuit is solidified and the cast product is taken out from the mold. The casting port member includes a connecting end portion to which a sleeve of a casting machine is connected and a region in which the biscuit is molded, and the biscuit is cooled during casting to promote solidification. The biscuit is cooled by cooling a region between the connecting end portion of the casting port member and a region where the biscuit is formed.

  According to these structures, the castability of a thin molded product improves.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a die 1 for die casting by a cold chamber method. FIG. 1 shows a mold for casting a part of a casing of a portable computer as an example of a mold to which the present invention is applied.

  FIG. 2 shows a molded product 2 cast by the mold 1. 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 is attached to the recess and faces the movable mold 5. The cavity member 12 has, for example, a mold surface corresponding to the front side of the product.

  The casting port member 13 includes a through hole 13a into which an injection plunger 17 of a casting machine is inserted, and is formed in a cylindrical shape. 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 as shown in FIG. 5, 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 surface on the fixed platen side).

  As shown in FIG. 5, the casting port member 13 is provided with a first end 14 in contact with the movable mold 5 and a second end that is provided on the opposite side of the first end 14 and is exposed to the fixed platen side. And a connecting end 15 that is an end. The connecting end 15 is connected to a sleeve 18 of a casting machine (see FIG. 6).

  On the other hand, as shown in FIG. 1, 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), a mold closing position where the mold is clamped in combination with the fixed mold 4, and a fixed mold for taking out the casting 31 (see FIG. 4) from the mold 1. It is possible to advance and retreat between the mold opening positions separated from 4.

  The movable mold plate 21 is fixed to the movable platen and has a concave portion 21 a to which the core member 22 is attached on the surface facing the fixed mold 4. The core member 22 is attached to the recess 21 a and faces the fixed mold 4. The core member 22 has, for example, a mold surface corresponding to the back side of the product. As shown in FIG. 5, the diverter 23 faces the casting port member 13 and abuts on the casting port member 13. The diverter 23 diverts the molten metal and controls the filling amount according to the shape to be cast.

  FIG. 3 schematically shows the internal space 41 of the mold 1. When the mold surface of the fixed mold 4 and the mold surface of the movable mold 5 are combined with each other, an internal space 41 as shown in FIG. 3 is formed between the fixed mold 4 and the movable mold 5. 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 of the casting machine. The biscuit portion 43 will be described in detail later.

  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, as shown in FIG. 4, 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. The casting 31 molded into the product is obtained. The biscuit 51 is formed in a cylindrical shape depending on the inner diameter of the sleeve 18 and has a diameter of, for example, about 70 mm to 100 mm. The biscuit 51 has a role as a buffer part that reduces the impact when stopping the injection plunger 17 that moves forward at a high speed, and a role as an adjustment part that adjusts the difference in the amount of molten metal supplied for each cycle. A thickness T of about 20 mm is required.

  The mold 1 is always heated to, for example, nearly 300 degrees for the purpose of delaying the solidification of the molten metal. As shown in FIG. 1, the mold 1 is provided with first to fourth temperature raising circuits 61, 62, 63, 64 for raising the temperature of the mold 1. These first to fourth temperature raising circuits 61, 62, 63, 64 are each supplied with hot oil circulated between the heating devices provided in the casting machine, and the mold 1 is moved about 300 degrees. Keep it at a high temperature. That is, the fixed mold 4 and the movable mold 5 are heated to a temperature exceeding the boiling point of water.

  More specifically, as shown in FIG. 1 and FIG. 5, the first temperature raising circuit 61 extends into the inside of the fixed mold 11 from an opening that opens on the side surface of the fixed mold 11. Is a circuit for raising the temperature. The second temperature raising circuit 62 is provided so as to extend from the opening opening on the side surface of the fixed mold plate 11 to the inside of the cavity member 12, and raises the temperature of the cavity member 12. The third temperature raising circuit 63 is provided so as to extend from the opening opening on the side surface of the movable mold 21 to the inside of the core member 22, and raises the temperature of the core member 22. The fourth temperature raising circuit 64 is a circuit that extends from the opening that opens to the side surface of the movable mold 21 to the inside of the movable mold 21 and raises the temperature of the movable mold 21.

Next, the biscuit portion 43 will be described.
As shown in FIG. 5, the diverter 23 has a convex portion 67 that protrudes toward the casting port member 13. The convex portion 67 extends along the inner peripheral surface 13 b of the casting port member 13, and the tip portion of the convex portion 67 is inserted into the casting port member 13. As shown in FIG. 6, an injection plunger 17 of a casting machine is inserted into the through hole 13 a of the casting port member 13. The aforementioned biscuit portion 43 is formed by the end surface 67 a of the flow divider 23, the end surface 17 a of the injection plunger 17 pushed into the mold 1, and the inner peripheral surface 13 b of the casting port member 13. Thus, the casting port member 13 has a biscuit forming region 69 in which the biscuit 51 is formed during casting. The biscuit forming region 69 referred to in the present invention is defined in more detail, which is a region facing the biscuit 51 from the radial direction of the casting port member 13, and is a region surrounded by an alternate long and short dash line in FIG.

Next, the cooling circuit 71 that cools the biscuits 51 during casting will be described.
As shown in FIG. 5, the cooling circuit 71 is provided along the other region of the casting port member 13 that is provided in the fixed mold 4 and is out of the biscuit forming region 69. Specifically, it is provided along the region between the biscuit molding region 69 and the connecting end 15.

  The cooling circuit 71 is formed by grooves 73 and 74 dug in the circumferential direction on the outer peripheral surface 13 c of the casting port member 13 and a ring-shaped collar member 75 attached to the outer circumferential surface 13 c of the casting port member 13. . The collar member 75 is firmly joined to the outer peripheral surface 13c of the casting port member 13 by welding, for example, without gaps, and the grooves 73 and 74 are covered to make them liquid-tight. Thereby, a cooling water passage 77 through which, for example, cooling water flows is formed along the outer peripheral surface 13 c of the casting port member 13. The cooling water is an example of a liquid refrigerant that cools the biscuits 51, and the cooling water channel 77 is an example of a channel through which the liquid refrigerant flows.

  More specifically, the first and second grooves 73 and 74 of the cooling circuit 71 are formed along the circumferential direction of the outer peripheral surface 13 c of the casting port member 13, and are mutually in the axial direction of the casting port member 13. Are spaced along. The first groove 73 is a groove closer to the biscuit forming region 69 among the two grooves 73 and 74.

  As shown in FIG. 5, the collar member 75 has an inflow port 75 a communicating with the first groove 73 and an outflow port 75 b communicating with the second groove 74. Further, the fixed mold plate 11 is provided with an inflow path 78a communicating with the inflow port 75a and an outflow path 78b communicating with the outflow port 75b.

  Between the first groove 73 and the second groove 74, there is provided a communication path (not shown) that allows the first groove 73 and the second groove 74 to communicate with each other. This communication path is provided, for example, on the opposite side along the circumferential direction of the casting port member 13 from the inflow port 75a and the outflow port 75b. The first groove 73 is closed at a portion downstream of the communication path. The second groove 74 is closed at a portion upstream from the communication path. Thus, the first and second grooves 73 and 74 cooperate to form a single cooling water channel 77 that surrounds the casting port member 13 in the circumferential direction by 360 degrees.

  According to such a configuration, the cooling circuit 71 that surrounds the outer peripheral surface 13c of the casting port member 13 by 360 degrees and has the inlet 75a and the outlet 75b opened at the same circumferential position is realized by a simple configuration. can do.

  As shown in FIG. 5, the first groove 73 is arranged with an interval S of, for example, 5 mm to 10 mm from the end surface 51 a of the biscuit 51. The second groove 74 is disposed at a larger distance from the end surface 51 a of the biscuit 51 than the first groove 73.

  A circulation device (not shown) provided in the casting machine is connected to the inflow path 78a and the outflow path 78b provided in the fixed mold plate 11. The circulation device sends the cooling water to the inflow path 78a and collects the cooling water flowing to the outflow path 78b. The circulation device is further connected to a cooling device (not shown) provided in the casting machine. The cooling device cools the cooling water collected by the circulation device.

  In the cooling water passage 77, the cooling water circulated between the cooling device provided in the casting machine flows. Specifically, the cooling water sent from the circulation device to the inflow path 78 a of the stationary mold plate 11 flows into the first groove 73 through the inflow port 75 a of the collar member 75. The cooling water that has flowed into the first groove 73 flows along the first groove 73 on the outer peripheral surface 13 c of the casting port member 13 over about a half circumference, and then flows into the second groove 74 through the communication path.

  The cooling water that has flowed into the second groove 74 flows along the second groove 74 on the outer peripheral surface 13 c of the casting port member 13 over the remaining half circumference, and flows out of the stationary mold plate 11 from the outlet 75 b of the collar member 75. It flows into the road 78b. The cooling water that has flowed into the outflow path 78b is collected by the circulation device, cooled by the cooling device, and then sent out to the outflow path 78b again.

  Here, the fixed mold 4 is maintained at a high temperature of about 300 degrees by the first and second temperature raising circuits 61 and 62 described above. The cooling water channel 77 is made to flow at a predetermined flow rate or higher so that the cooling water does not boil in the fixed mold 4.

  As shown in FIG. 1, a cooling circuit 81 for cooling the current divider 23 is provided separately from the cooling circuit 71 for cooling the casting port member 13. The cooling circuit 81 extends from the opening portion opened on the side surface of the movable mold plate 21 to the inside of the flow divider 23, and is connected to a circulation device and a cooling device provided in the casting machine.

Next, a manufacturing method for the molded product 2 by die casting using the mold 1 will be described.
First, a casting machine provided with the above-described mold 1 is prepared. The mold 1 is prepared in such a manner that high temperature oil is allowed to flow through the temperature raising circuits 61, 62, 63, 64, the temperature is raised to about 300 degrees, and the liquid refrigerant is circulated through the cooling circuits 71, 81. . Also, the raw material metal (eg, magnesium alloy) is melted to form a molten metal. The temperature of the molten metal is, for example, about 700 degrees.

  The casting cycle is then entered. First, the movable mold 5 moves and is combined with the fixed mold 4 and clamped. Next, the molten metal is injected into the sleeve 18 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. At this time, since the mold 1 is heated, the temperature drop of the molten metal is suppressed, and the molten metal is filled into the product part 45 via the gate part 44. A biscuit 51 is formed in the biscuit portion 43 formed inside the casting port member 13. The biscuit 51 is formed integrally with the gate portion 52 and the product portion 53 described above.

  The basic thickness of the product portion 53 is, for example, 0.6 mm or less, and solidification proceeds rapidly after filling. On the other hand, the biscuit 51 has a thickness T of 20 mm, for example, and is harder to solidify because it is thicker than the product portion 53. By cooling the area in between, solidification of the biscuits 51 is promoted. Thereby, solidification of the biscuit 51 is completed before solidification of the thin product part 53 progresses too much.

  After the biscuit 51 is solidified, the movable mold 5 moves to open the mold, and the casting 31 including the product portion 53 and the biscuit 51 is taken out from the mold 1. 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.
For example, when the cooling circuit is arranged so as to surround the biscuit molding region 69 (that is, the cooling water channel passes through the center of the thickness of the biscuit 51 within the cooling circuit), the temperature of the molten metal at the time of mold injection Is greatly reduced, and the fluidity of the molten metal is reduced.

  In order to suppress the temperature drop of the molten metal at the time of mold injection, for example, the cooling performance of the cooling circuit 71 may be lowered. As a method for lowering the cooling performance of the cooling circuit 71, for example, it is conceivable to set the temperature of the liquid refrigerant flowing through the cooling circuit 71 to a certain level. However, since this liquid refrigerant is repeatedly circulated in the mold 1 heated to about 300 ° C., even if an attempt is made to set the temperature of the liquid refrigerant, the temperature of the liquid refrigerant is reduced by heat conduction from the mold 1. Since it is far from the set value as time passes, it is almost impossible to manage the temperature of the liquid refrigerant substantially.

  In general, the discharge pressure of the liquid refrigerant in the circulation device is often determined for each casting machine, and the discharge amount of the liquid refrigerant cannot often be controlled. Therefore, the present inventor reduces the flow rate of the liquid refrigerant by increasing the cross-sectional area of the grooves 73 and 74 of the cooling circuit 71, thereby lowering the cooling performance of the cooling circuit 71, and lowering the temperature of the molten metal during mold injection. I thought it couldn't be suppressed. However, when the flow rate of the liquid refrigerant is decreased, the temperature rise of the liquid refrigerant in the fixed mold 4 increases. For example, in order to use a liquid refrigerant having a low boiling point such as cooling water, it has been found that the liquid refrigerant needs to be passed through the fixed mold 4 at a predetermined flow rate or higher so that the liquid refrigerant does not boil in the mold 1. In particular, if the flow path through which the liquid refrigerant flows has a relatively long flow path length that surrounds the casting port member 13 in the circumferential direction, it is necessary to set the flow rate of the liquid refrigerant to a certain level or more, so that the temperature of the molten metal is not significantly reduced. It turns out that it cannot be suppressed.

  That is, the mold 1 as a premise of the embodiment of the present invention is always heated to nearly 300 degrees for the purpose of delaying the solidification of the molten metal, and is molded inside the casting port member 13 in that temperature. It has the special feature that the biscuits 51 must be cooled.

  However, according to the configuration as described above, the castability of the thin-walled molded product is achieved by balancing the acceleration of solidification of the biscuits 51 and the suppression of the temperature drop of the molten metal without accurately managing the cooling performance of the cooling circuit 71. It is possible to provide a mold 1 with improved quality. That is, the cooling circuit 71 for cooling the biscuit 51 is deliberately removed from the periphery of the biscuit forming region 69, and the cooling circuit 71 is disposed along the region between the connecting end 15 of the casting port member 13 and the biscuit forming region 69. By arrange | positioning, the temperature fall of a molten metal can be suppressed and the solidification promotion of the biscuit 51 can be aimed at.

  According to this configuration, since it is not necessary to control the cooling performance of the cooling circuit 71, the above effect can be obtained with a simple configuration. The ability to simplify the structure related to the cooling device including the cooling circuit 71 is extremely advantageous in the casting machine and the mold 1 that handle high temperature and high pressure. Further, since it is not necessary to control the cooling performance of the cooling circuit 71, it is not necessary to adjust the discharge amount and discharge pressure of the liquid refrigerant, and the previous casting machine can be used as it is.

  According to the manufacturing method of the molded product 2 having the above-described configuration, the thinning is achieved by balancing the acceleration of the solidification of the biscuits 51 and the suppression of the temperature drop of the molten metal without accurately managing the cooling performance of the cooling circuit 71. It is possible to provide a method for manufacturing a molded product with improved castability of the molded product. Moreover, the molded article by such a casting method can be provided.

  FIG. 7 shows an example of an experimental result showing the effect when the cooling circuit 71 is provided with the biscuit forming region 69 removed. In FIG. 7, the horizontal axis represents the basic thickness of the casing base of a B5 size portable computer as a molded product, and the vertical axis represents the flow ratio. The “flow ratio” is a value obtained by dividing the flow length by the basic wall thickness. The “flow length” is the length of the molten metal flowing.

  As shown in FIG. 7, “when the cooling circuit is provided outside the biscuit forming region” (solid line in FIG. 7) is “when the cooling circuit is provided along the biscuit forming region” ( It can be seen that the fluidity of the molten metal is better than that in FIG. Further, from another experimental data, it was found that the melt temperature at the time of mold injection increased by about 100 degrees and the fluidity increased by about 2 times. Further, when the temperature of the biscuit 51 of the casting 31 immediately after being removed from the mold 1 is measured, the case where “the cooling circuit is provided outside the biscuit molding region” is “the cooling circuit is in the biscuit molding region”. It has also been confirmed that the temperature of the biscuits 51 is nearly 100 degrees higher than the case where it is provided along.

  The embodiment of the present invention can be said to be particularly advantageous, for example, in casting a thin molded product having a basic thickness of 0.6 mm or less. For example, as is clear from “when the cooling circuit is provided along the biscuit molding region” in FIG. 7, when the basic thickness exceeds 0.6 mm, the flow ratio is proportional as the basic thickness decreases. However, when the basic thickness is 0.6 mm or less, it can be seen that the flow ratio rapidly decreases as the basic thickness decreases. It can be said that the embodiment of the present invention that improves the fluidity of the molten metal exhibits a particularly remarkable effect in such a region where the flow ratio rapidly decreases.

  From another viewpoint, the embodiment of the present invention can be said to be particularly advantageous in the casting of a thin molded product having a basic thickness of 0.4 mm to 0.5 mm, for example. In “when the cooling circuit is provided along the biscuit molding region”, even if an attempt was made to cast a B5 size casing base with a thin wall of 0.5 mm or less, the flow length was insufficient and casting could not be performed. When this is applied to FIG. 7, it is understood that a casting ratio of about B5 size requires a flow ratio of about 400.

  On the other hand, when “the cooling circuit is provided outside the biscuit forming region”, a flow ratio of 400 or more can be ensured even when the basic thickness is in the range of 0.4 mm to 0.5 mm. This experimental result is for the case base, but it goes without saying that the same effect can be obtained with the case cover.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to these, and various modifications can be made without departing from the gist of the invention. The molded product to which the present invention is applied is not limited to a molded product having a basic thickness of 0.6 mm or less, and can be widely applied in general.

  For example, in the above embodiment, the first groove 73 is upstream of the flow of the liquid refrigerant and the second groove 74 is downstream, but the first groove 73 is downstream and the second groove 74 is upstream. There may be.

The perspective view which decomposes | disassembles and shows the metal mold | die which concerns on one Embodiment of this invention. The perspective view of the molded product shape | molded with the metal mold | die shown in FIG. The top view which shows typically the interior space of the metal mold | die shown in FIG. FIG. 2 is a perspective view schematically showing a cast product cast by the mold shown in FIG. 1. Sectional drawing of the metal mold | die shown in FIG. Sectional drawing which shows the state at the time of casting of the metal mold | die shown in FIG. The figure which shows the effect which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Mold, 2 ... Molded article, 4 ... Fixed mold, 5 ... Movable mold, 13 ... Casting port member, 13c ... Outer peripheral surface, 15 ... Connection end part, 17 ... Injection plunger, 18 ... Sleeve, 23 ... Split flow Child, 31 ... cast product, 61, 62, 63, 64 ... temperature rising circuit, 69 ... biscuit forming region, 71 ... cooling circuit, 77 ... cooling water channel.

Claims (5)

Fixed type,
A movable mold combined with the fixed mold;
A casting port member provided in the fixed mold and formed in a cylindrical shape, and having a connecting end portion to which a sleeve of a casting machine is connected and a region where a biscuit is formed at the time of casting;
A temperature raising circuit for raising the temperature of the fixed mold and the movable mold to a temperature exceeding the boiling point of water;
A cooling water path through which cooling water circulated between the cooling device provided in the casting machine flows, and a cooling circuit for cooling the biscuits formed in the casting port member during casting,
The cooling water channel surrounds the casting port member in the circumferential direction, and is caused to flow at a predetermined flow rate or more so that the cooling water does not boil in the fixed mold,
The cooling circuit is provided along an area between the connection end and the area where the biscuit is formed, outside the area where the biscuit is formed on the outer peripheral surface of the casting port member. Die casting mold. The mold according to claim 1, wherein
A mold characterized by casting a thin molded product having a basic thickness of 0.6 mm or less. Fixed type,
A movable mold combined with the fixed mold;
A casting port member provided on the fixed mold and provided with a connecting end portion to which a sleeve of a casting machine is connected and a region where a biscuit is formed at the time of casting,
A cooling circuit that includes a flow path through which liquid refrigerant flows, and that cools the biscuits formed in the casting port member during casting,
The die casting mold according to claim 1, wherein the cooling circuit is provided along a region between the connecting end portion of the casting port member and a region where the biscuit is formed. A method for producing a molded product by die casting in which a biscuit is formed in a casting port member at the time of casting, and after waiting for this biscuit to solidify, the cast product is taken out from the mold,
The casting port member includes a connecting end portion to which a sleeve of a casting machine is connected, and a region where the biscuit is molded,
The biscuit is cooled at the time of casting to promote solidification, and the cooling of the biscuit is performed by cooling the region between the connecting end of the casting port member and the region where the biscuit is formed. A method for producing a featured molded article. Biscuits are formed in the casting port member at the time of casting, and after the solidification of the biscuits, the cast product is taken out from the mold, and is a molded product by die casting.
The casting port member includes a connecting end portion to which a sleeve of a casting machine is connected, and a region where the biscuit is molded,
The biscuit is cooled at the time of casting and solidification is promoted, and the cooling of the biscuit is performed by cooling the region between the connecting end portion of the casting port member and the region where the biscuit is formed. Characteristic molded product.

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