JP2007296572A - Cooling structure of die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the cooling structure of a die in which control such that a portion desired to be cooled can selectively be cooled, a part in direct contact with molten metal and heated can be cooled at a proper temperature, and a part other than the above part and almost unnecessary to be cooled is not cooled so much, is made possible. <P>SOLUTION: In the cooling structure of the die, in which the surrounding of a cooling chamber is cooled by circulating a cooling medium having fluidity in the cooling chamber arranged in the inner part of the die, a flow control means 5 for controlling the flow of the cooling medium in the cooling chamber is installed in the inner part of the cooling chamber. The structure is constituted so as to have partial difference in the heat drawing amount from the die in the surrounding of this cooling chamber by generating a relatively fast flowing portion and a not-so-fast flowing portion in the cooling medium flow circulating in the cooling chamber by the flow control means 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mold cooling structure used for die casting and the like, and more specifically, a mold for cooling the periphery of a cooling chamber by circulating a fluid refrigerant in a cooling chamber provided inside the mold. With regard to the cooling structure of the mold, in particular, it is provided at a forwardly opposed position of the plunger tip that advances the inside of the injection sleeve and presses the molten metal, and is applied to a mold diverter for guiding the molten metal pressed by the plunger tip to the runner Then, it is related with the cooling structure of a suitable metal mold | die.

  In die casting, after the molten metal poured into the injection sleeve is injected and filled into the mold cavity with the plunger tip, the plunger tip is continuously advanced to increase the pressure on the molten metal in the cavity, thereby solidifying the molten metal. This prevents casting defects such as shrinkage cavities.

At this time, a disc-shaped solidified piece called a biscuit is formed between the diverter and the plunger tip, but this biscuit is relatively thick, so it takes time to solidify and prolongs the casting cycle. It has become.
In view of this, various attempts have been made to shorten the time required for solidification of the biscuits (see, for example, Patent Document 1 and Patent Document 2).
These prior arts attempt to shorten the time required for solidification of the biscuits by forming a cooling space inside the flow divider and supplying cooling water into the space to cool the flow divider.

Japanese Patent No. 3097515 JP-A-2005-74445 JP 2003-191063 A

However, as a practical matter, in a general die-casting machine, the diverter is heated extremely at the tip surface part (front part facing the plunger tip) and the part directly under the runner that is in direct contact with the molten metal. Because it is not heated, every time a product is cast by injecting molten metal, extreme strain due to thermal stress occurs between the part that is in direct contact with the molten metal and the part that is not, and the shunt may be broken by repetition of that. there were.
That is, in the above-mentioned prior art document 2, when trying to cool the tip surface portion heated directly in contact with the molten metal and the portion directly below the runner to an appropriate temperature, other portions that are not heated by the molten metal are also cooled in the same manner. The portion is supercooled, and as a result, distortion due to extreme thermal stress occurs between the portion that is in direct contact with the molten metal and the portion that is not.

  In the case of such a cooling structure, not only the processing cost becomes very high in order to be able to withstand the distortion caused by extreme thermal stress, but also in a part that must be cooled forcibly because the molten metal contacts. The cooling water flow time is about half of the total circulation time, and the cooling efficiency is never good.

  Further, in the cooling means described in the above-mentioned prior art document 3, a large amount of air exists in the cooling chamber at the start of cooling. The air in the cooling chamber is not easily discharged from the cooling chamber even if the pressure of the cooling water flowing through the cooling chamber is increased or the water flow time is increased, and the air stays in the upper part of the cooling chamber. For this reason, even if cooling water is passed through the cooling chamber, sufficient cooling capacity cannot be exhibited around the upper part.

  The present invention has been made in view of such a current situation, and can selectively cool a portion to be cooled, and can cool a portion heated in direct contact with molten metal to an appropriate temperature. It is possible to control that it is not necessary to cool much in other parts that require little cooling, and as a result, distortion due to extreme thermal stress between the part that is in direct contact with the molten metal and the part that is not so. It is possible to suppress the generation of bubbles, and to provide a mold cooling structure that can quickly discharge bubbles such as bubbles or vapor species existing in the cooling chamber immediately after the start of cooling and thereafter. Is.

  In this type of cooling structure, the periphery of the cooling chamber is cooled by taking heat away from the refrigerant present in the cooling chamber formed inside the mold, so it is better to circulate the refrigerant in the cooling chamber, In addition, it is better to flow the coolant in contact with the surface to be cooled of the mold and increase the flow velocity. Then, the replacement of the refrigerant that has taken away the heat of the mold will be faster, the heat exchange rate with the mold will be better, the amount of heat taken from the mold (around the cooling chamber) will be increased, and the mold ( The cooling effect around the cooling chamber can be enhanced.

The present invention has been made on the basis of such knowledge, and by generating a portion that flows relatively quickly and a portion that does not relatively flow in the flow of the refrigerant flowing along the inner wall surface of the cooling chamber, the cooling chamber is provided. In this configuration, the amount of heat taken from the mold in the vicinity can be partially differentiated.
That is, the mold cooling structure of the present invention is a mold cooling structure for cooling the periphery of the cooling chamber by circulating a fluid refrigerant through a cooling chamber provided inside the mold, A flow control means for controlling the flow of the refrigerant in the cooling chamber is installed inside the cooling chamber, and a portion that flows relatively fast with the flow control means relative to the flow of the refrigerant flowing along the inner wall surface of the cooling chamber; It is characterized in that a part of the amount of heat taken from the mold around the cooling chamber can be partially differentiated by generating a portion that is not so (Claim 1).
Incidentally, as the refrigerant, commonly used cooling water, cooling oil, or the like can be used.

As a preferred embodiment to which the present invention is applied, a mold diverter provided at a forwardly facing position of a plunger tip that moves forward in the injection sleeve and presses the molten metal is conceivable. That is, the cooling chamber is formed inside a mold shunt, and the flow control means includes a partition material that defines the internal space of the cooling chamber as an upper space portion and a lower space portion, and the lower space portion. The refrigerant discharge port faces the front space formed between the vertical partition material and the front wall of the cooling chamber through the vertical partition material. In addition, a refrigerant discharge port is provided in a sealing wall member that seals the opening of the cooling chamber, and the refrigerant discharged from the refrigerant discharge port passes from the front space portion through the upper space portion to the refrigerant discharge port. The refrigerant flowing in the direction from the front space portion to the upper space portion is relatively increased in flow rate so that the periphery of the cooling chamber extending from the front space portion to the upper space portion and the periphery of the other cooling chamber To make a difference in the amount of heat taken from the mold. And it constitutes as (claim 2).
At this time, it is preferable that the sealing wall member in a portion corresponding to the upper space portion of the cooling chamber is provided with a refrigerant discharge / exhaust port for discharging bubbles generated in the cooling chamber to the outside. ).

Further, a second horizontal partition member may be projected from the vertical partition member facing the front space portion toward the front wall of the cooling chamber at a lower position than the refrigerant discharge port. .
Further, a refrigerant discharge pipe is concentrically disposed outside the refrigerant supply pipe provided with the refrigerant discharge port, and the gap between the outer periphery of the refrigerant supply pipe and the inner periphery of the refrigerant discharge pipe can be used as a refrigerant discharge port. Good (claim 5).
Moreover, it is preferable that the said lower space part is defined in the several chamber using the said several vertical partition material (Claim 6).

Furthermore, as another embodiment of the mold flow divider to which the present invention is preferably applied, the flow control means is an upper portion formed between the internal space of the cooling chamber and the upper wall portion of the cooling chamber. A defining block including a sealing wall portion that defines a front space portion formed between the space portion and the front wall, and the remaining portion contacts the inner wall of the cooling chamber and seals the opening of the cooling chamber. The refrigerant discharge port is formed at a position facing the front space portion of the defined block material, the refrigerant discharge port is provided in the sealing wall portion corresponding to the upper space portion, and the refrigerant discharge port is discharged. The coolant is circulated from the front space portion through the upper space portion to the refrigerant discharge port, so that a mold is formed around the cooling chamber extending from the front space portion to the upper space portion and around the other cooling chamber. It is also possible to make a difference in the amount of heat taken from the ).
Moreover, you may make the 2nd horizontal partition material protrude toward the front wall of the said cooling chamber in the lower position rather than the said refrigerant | coolant discharge port facing the said front space part (Claim 8).

  According to the mold cooling structure of the present invention, the flow control means causes a portion that flows relatively fast and a portion that does not flow relatively to the flow of the refrigerant flowing along the inner wall surface of the cooling chamber. The amount of heat taken from the mold increases in the vicinity of the cooling chamber in the part where the refrigerant flows relatively fast, and the cooling effect is high, and the amount of heat taken from the mold is not so large in the vicinity of the cooling chamber in other parts. Relatively low. As a result, instead of forcibly cooling the entire periphery in one cooling chamber, it becomes possible to make a difference in the amount of heat taken from the mold partially in the vicinity of one cooling chamber.

  That is, it is possible to distinguish a portion that is desired to be cooled in the vicinity of one cooling chamber from a portion that is not desired, and to actively cool a portion that is desired to be cooled. become.

  When this is applied to the mold flow divider, only the part that needs to be actively cooled, such as the tip part (the part facing the plunger tip) that directly contacts the molten metal and the part directly under the runner, is effectively and properly On the contrary, since it is in direct contact with the molten metal, it is hardly cooled at a portion that hardly requires cooling. Therefore, the temperature balance of the entire mold (divider) is improved, and distortion due to thermal stress applied to the part can be minimized.

  According to the mold cooling structure of claim 2, the flow control means for defining the cooling chamber formed inside the mold diverter includes the upper space portion and the lower portion of the internal space of the cooling chamber. Formed by a horizontal partition material that defines a space portion and a vertical partition material that defines the lower space portion to the left and right, and a coolant discharge port that penetrates the vertical partition material and the vertical partition material and cooling chamber And the refrigerant discharge port is provided in a sealing wall member that seals the opening of the cooling chamber, and the refrigerant discharged from the refrigerant discharge port is By flowing from the front space part through the upper space part toward the refrigerant discharge port and relatively increasing the flow rate of the refrigerant flowing through the part extending from the front space part to the upper space part, the upper part from the front space part is Around the cooling room over the space and around the cooling room in other parts Because it is configured to make a difference in the amount of heat taken from the mold, the tip surface part that directly contacts the molten metal corresponding to the part extending from the front space part to the upper space part of the cooling chamber (the front surface facing the plunger tip) Part) and the part directly under the runner can be cooled effectively and properly, and conversely, the part corresponding to the lower space where the refrigerant does not flow is not cooled much.

  At this time, it is preferable to arrange the refrigerant discharge port in accordance with the center position of the biscuit. If it does so, it becomes possible to cool and solidify more effectively the center part of the biscuit which is hard to cool and solidify, and the biscuits bursting accident by insufficient cooling can be prevented.

  In addition, when a refrigerant having fluidity is circulated in the cooling chamber, gas components (bubbles) that have been in the refrigerant supply path at the beginning of the circulation, and vapor species generated from the refrigerant superheated by the molten metal at the time of casting. However, in the case of a mold shunt, in particular, in the case of a mold diverter, bubbles such as bubbles or vapor species (hereinafter simply referred to as “bubbles”) are formed in the upper space corresponding to the portion immediately below the runner. ")" Tends to stay. If bubbles stay in the upper space portion of the cooling chamber, the refrigerant cannot directly contact the inner wall of the cooling chamber, and naturally, the peripheral portion cannot be effectively cooled.

However, according to the mold cooling structure of the third aspect of the present invention, bubbles generated in the cooling chamber are discharged to the sealing wall member in a portion corresponding to the upper space portion of the cooling chamber. Therefore, bubbles generated in the cooling chamber are quickly discharged to the outside through the refrigerant discharge / exhaust port together with the refrigerant circulating in the cooling chamber, and stay in the cooling chamber. Absent.
As a result, the upper space portion of the cooling chamber is filled with the refrigerant instantaneously after the start of cooling and thereafter, so the area around the upper space portion of the cooling chamber, that is, the portion directly below the runner where the molten metal directly contacts is effectively Can be cooled.

  According to the mold cooling structure of claims 4 and 8, the second horizontal partition facing the front space of the cooling chamber and at a position lower than the coolant discharge port toward the front wall of the cooling chamber. Since the material is protruded, the refrigerant discharged from the refrigerant discharge port is blocked by the second horizontal partition material, passes from the front space portion to the upper space portion toward the refrigerant discharge port at a higher speed than the other portions. Therefore, the amount of refrigerant flowing in the space part partitioned by the second horizontal partition material and the front wall of the cooling chamber and the vertical partition material or the defined block material is relatively very small, The amount of heat taken from the mold in the peripheral portion is smaller than in other portions. In addition, the peripheral portion is a portion corresponding to a portion where the molten metal comes into contact immediately after pouring into the injection sleeve, and since the refrigerant is always present, the amount of refrigerant flowing in the injection sleeve is reduced. It is possible to prevent the poured molten metal from being overcooled, and thus it is possible to suppress the generation of a broken chill layer of the molten metal injected into the mold cavity.

  Further, according to the mold cooling structure of the fifth aspect, the refrigerant discharge pipe is concentrically arranged outside the refrigerant supply pipe provided with the refrigerant discharge port, and the outer periphery of the refrigerant supply pipe and the refrigerant discharge are arranged. Since the refrigerant outlet is formed between the pipe and the inner periphery, a commercially available inexpensive double pipe type cooling pipe can be used.

  Further, according to the mold cooling structure of claim 6, since the lower space portion of the cooling chamber is defined in the plurality of chambers by the plurality of vertical partition members, the front space portion and the upper space portion are defined. Even when the refrigerant circulating through the refrigerant outlet is reflected by the sealing wall member that seals the opening of the cooling chamber and flows to the lower space side, a plurality of vertical partition members are used. Since it is buffered, the movement of the refrigerant in the lower space becomes very small. Therefore, the cooling effect around the cooling chamber in the lower space is remarkably reduced. As a result, the molten metal is not in direct contact, and therefore it is not necessary to cool the peripheral portion of the lower space of the cooling chamber that does not require much cooling.

  According to the cooling structure of the seventh aspect, the flow control means that defines the cooling chamber includes an upper space portion that is formed between the inner space of the cooling chamber and the upper wall portion of the cooling chamber, and the front portion. The remaining space defined by the front space formed with the wall is formed of a defined block material having a sealing wall portion that contacts the inner wall of the cooling chamber and seals the opening of the cooling chamber. Since the refrigerant discharge port is formed at a position facing the front space portion of the defined block material and the refrigerant discharge port is provided in the sealing wall portion corresponding to the upper space portion, the structure becomes simple, Manufacture is easy and can be provided at low cost.

  In addition, particularly when the present cooling structure is applied to the shunt, it is only necessary to relatively increase the flow rate of the refrigerant flowing through the portion from the front space portion to the upper space portion in the cooling chamber. The defining flow control means does not need to be molded with such a high processing accuracy, and can be provided simply and inexpensively.

Hereinafter, specific preferred embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and can be freely set within the scope of the invention. It can be changed.
In addition, the same code | symbol is attached | subjected to the same structural member through all drawings.

  FIG. 1 is a cross-sectional view schematically showing a side injection type die casting machine to which a mold cooling structure according to the present invention is applied. In the figure, reference numeral 1a represents a fixed mold, reference numeral 1b represents a movable mold, Reference numeral 2 denotes an injection sleeve, and reference numeral 3 denotes a plunger tip. A mold diverter 4 is provided at a forward facing position of the plunger tip 3 that moves forward in the injection sleeve 2 to press the molten metal.

  The molten metal that has been supplied from the pouring port 2a into the injection sleeve 2 and then pressed by the plunger tip 3 passes from the front surface 41 of the mold diverter 4 through the upper surface of the upper wall portion 42 and passes through the fixed mold 1a. The cavity 1d is filled and pressurized through a runner 1c formed between the movable mold 1b and a product is obtained.

The mold cooling structure according to the present invention cools the periphery of the cooling chamber by circulating a coolant having fluidity such as cooling water or cooling oil in a cooling chamber provided at an appropriate position inside the mold. The flow control means for controlling the flow of the refrigerant in the cooling chamber is installed in the cooling chamber, and the flow of the refrigerant flows along the inner wall surface of the cooling chamber by the flow control means. It is configured to cause a difference in the amount of heat taken from the mold around the cooling chamber by generating a relatively fast flowing portion and a non-flowing portion. Similarly, it can be applied to the fixed mold 1a and the movable mold 1b.
Incidentally, in the illustrated embodiment, the present invention is applied to the diverter 4 constituting a part of the movable mold 1b.

A cooling chamber 43 for circulating a coolant such as cooling water or oil and cooling the periphery thereof is formed in the shunt 4 so as to extend in the axial direction. Therefore, the opening opposite to the front wall 41 of the cooling chamber 43 is formed in a watertight state by post-processing with a separately formed sealing wall member 6 or a part of the flow control means 5 (sealing wall portion 53). Sealed.
Inside the cooling chamber 43, a flow control means 5 for controlling the flow of the refrigerant in the cooling chamber 43 is installed.

  The flow control means 5 controls the flow of the refrigerant flowing through the inside of the cooling chamber 43 so as to generate a portion that flows relatively quickly and a portion that does not flow in the flow of the refrigerant flowing through the cooling chamber 43. In the first embodiment shown in FIG. 2 to FIG. 4, a horizontal partition member 51 for defining the internal space of the cooling chamber 43 into an upper space portion 7a and a lower space portion 7b, and the lower space portion described above. In the second embodiment shown in FIGS. 5 to 7, the internal space of the cooling chamber 43 is connected to the upper wall portion 42 of the cooling chamber. The upper space portion 7a formed therebetween and the front space portion 7c formed between the front wall 41 and the remaining portion contact the inner wall of the cooling chamber and seal the opening of the cooling chamber. It is formed of a defined block material provided with a stop wall portion 53.

  In the flow control means 5 of the first embodiment shown in FIGS. 2 to 4, the transverse partition member 51 is formed in a substantially ship bottom shape in cross section when viewed from the front using a metal plate or the like having rigidity and heat resistance, The inner space of the cooling chamber 43 is defined as an upper space portion 7a and a lower space portion 7b by installing both end edges 51a along the longitudinal direction so as to contact the inner surface of the upper wall portion 42 of the cooling chamber 43. The base end side is brought close to or in contact with the sealing wall member 6, and the tip end side is extended horizontally to the vicinity of the front wall 41 of the cooling chamber 43.

The vertical partition member 52 is used to further define the lower space portion 7b defined by the horizontal partition member 51 on the left and right sides, and the cooling chamber 43 is formed by using the same metal plate as the horizontal partition member 51. It is formed to have substantially the same size as the inner peripheral shape that has been cut, and a portion corresponding to the upper space portion 7a is formed by notching, and one or more of them are vertically projected from the lower surface of the horizontal partition member 51.
At that time, the vertical partition member 52 disposed on the most front side of the horizontal partition member 51 is opposed to the front wall 41 of the cooling chamber 43, and the vertical partition member 52 and the front wall 41 define the front space portion 7c. The lower space portion 7b formed between the vertical partition member 52 and the sealing wall member 6 is defined on the left and right by another one or two vertical partition members 52.

Then, the refrigerant discharge port 53 passes through the vertical partition member 52 and faces the front space portion 7c formed between the vertical partition member 52 and the front wall 41 of the cooling chamber, and the refrigerant discharge port 54 Is provided on the sealing wall member 6 that seals the opening of the cooling chamber 43, and the refrigerant discharged from the refrigerant discharge port 53 passes through the upper space portion 7a from the front space portion 7c of the cooling chamber 43 and the refrigerant discharge port. To be distributed to 54.
At this time, the refrigerant discharge port 53 is arranged in accordance with the center position of the screw formed between the plunger tip 3 and the mold flow divider 4.

  When the refrigerant is circulated in the cooling chamber 43, bubbles (gas components (bubbles) that have been in the refrigerant supply path at the initial stage of distribution, and vapor species generated from the refrigerant superheated by the molten metal at the time of casting) are generated. Since it may stay in the cooling chamber 43, the sealing wall member 6 in the portion corresponding to the upper space portion 7a of the cooling chamber 43 may be filled with the refrigerant so that it can be smoothly removed from the cooling chamber 43. An exhaust port 58 that also serves as a discharge is provided. Therefore, it is preferable that the exhaust port 58 is disposed as high as possible in the upper space portion 7a (a portion as close as possible to the outer peripheral edge of the sealing wall member 6).

  Further, when the refrigerant discharge port 54 is formed in the sealing wall member 6, the refrigerant discharge pipe 56 is concentrically disposed outside the refrigerant supply pipe 55 provided with the refrigerant discharge port 53 as in the illustrated embodiment. Assuming that the refrigerant outlet 54 is between the outer circumference of the refrigerant supply pipe 55 and the inner circumference of the refrigerant outlet pipe 56, a commercially available double pipe type cooling pipe is used, and the refrigerant outlet 53 And an outlet 54 can be formed. At this time, it is preferable that the refrigerant discharge pipe 56 does not protrude too much into the cooling chamber 43.

  Further, in the front space portion 7c of the cooling chamber 43, a second horizontal partition member 57 for vertically defining the front space portion 7c is installed at a position below the refrigerant discharge port 53. That is, the second horizontal partition member 57 formed in a rectangular flat plate shape having substantially the same length as the diameter of the vertical partition member 52 is attached to the vertical partition member 52 facing the front space portion 7c. Project horizontally toward 41. At this time, the tip of the second horizontal partition member 57 may be in contact with the front wall 41 of the cooling chamber 43, or may be separated slightly without contacting.

  Thus, in the mold cooling structure according to the first embodiment, the refrigerant discharged from the refrigerant discharge port 53 of the refrigerant supply pipe 55 collides with the front wall 41 in the front space portion 7c of the cooling chamber 43 and is heated there. While exchanging, most of it is guided to the second horizontal partition member 57 and reaches the upper space portion 7a. In the upper space portion 7a, the refrigerant discharge port 54 is in contact with the inner surface of the upper wall portion 42 of the cooling chamber 43 while exchanging heat. And is discharged to the outside through the refrigerant outlet 54. At this time, by providing the refrigerant discharge / exhaust outlet 58 in the sealing wall member 6 corresponding to the upper space 7a, most of the refrigerant in the upper space 7a is discharged to the outside through the refrigerant exhaust / exhaust outlet 58. It becomes like this.

The flow rate of the refrigerant flowing through the portion from the front space portion 7c to the upper space portion 7a is overwhelming than the flow rate of the refrigerant in the lower front space portion 7d defined by the lower space portion 7b and other second horizontal partition members 57. Faster.
As a result, the amount of heat taken from the mold in the periphery of the cooling chamber from the front space portion 7c to the upper space portion 7a of the cooling chamber 43 is larger than that in the vicinity of the cooling chamber of other portions, so that the portion is quickly and strongly cooled. The

Next, a mold cooling structure according to a second embodiment of the present invention will be described with reference to FIGS.
In addition, the same code | symbol is attached | subjected to the structural member similar to the cooling structure of the metal mold | die concerning 1st Example, and the overlapping description is abbreviate | omitted.

In this second embodiment, the flow control means 5 is formed of one defined block material.
That is, it has a sealing wall portion 53 that can seal the opening of the cooling chamber 43, and has a bowl-shaped recess 59 that defines the upper space portion 7a with the upper wall portion 42 of the cooling chamber 43, and The front end portion defines the front space portion 7c with the front wall 41 of the cooling chamber 43, and the other portions are formed inside the defining block member formed to be in contact with the inner wall of the cooling chamber 43. The coolant passage 60 for supplying the coolant into the cooling chamber 43 is formed to penetrate the coolant passage 53 so that the coolant discharge port 53 faces the front space portion 7c, and the coolant discharge port 54 corresponds to the upper space portion 7a. It is provided at the portion of the stop wall portion 53. The refrigerant discharge port 54 also serves as an exhaust port for discharging bubbles in the cooling chamber 43 to the outside.

  In the second embodiment, similarly to the first embodiment, the front end portion of the defining block member is positioned below the refrigerant discharge port 53, and the second horizontal partition member 57 is attached to the front wall 41 of the cooling chamber 43. The front space portion 7c is vertically defined by projecting horizontally.

  Thus, in the mold cooling structure according to the second embodiment, the refrigerant discharged from the refrigerant discharge port 53 through the refrigerant passage 60 from the external pipe 8 collides with the front wall 41 in the front space portion 7c of the cooling chamber 43. Then, the heat reaches the upper space portion 7a while exchanging heat. In the upper space portion 7a, it contacts the inner surface of the upper wall portion 42 of the cooling chamber 43 and is discharged outside through the refrigerant discharge port 54 while exchanging heat.

The flow of the refrigerant flowing through the portion from the front space portion 7c to the upper space portion 7a flows much faster than the movement of the refrigerant in the portion in contact with the inner wall of the cooling chamber 43.
As a result, the amount of heat taken from the mold in the periphery of the cooling chamber from the front space portion 7c to the upper space portion 7a of the cooling chamber 43 is larger than that in the vicinity of the cooling chamber of other portions, so that the portion is quickly and strongly cooled. The

The schematic diagram cross section which shows the principal part of the die-casting machine to which the cooling structure of the metal mold | die which concerns on this invention is applied. Sectional drawing which shows 1st Example of this invention. Sectional drawing which follows the (X)-(X) line | wire of FIG. The perspective view of the flow control means. Sectional drawing which shows 2nd Example of this invention. Sectional drawing which follows the (Y)-(Y) line | wire of FIG. The perspective view of the flow control means.

Explanation of symbols

1a: Fixed type 1b: Movable type
1c: Runner 1d: Cavity 2: Injection sleeve 2a: Pouring gate 3: Plunger tip 4: Mold diverter
41: Front wall 42: Upper wall
43: Cooling room 44:
5: Flow control means 51: Horizontal partition material
52: Vertical partition 53: Refrigerant outlet
54: Refrigerant outlet 55: Refrigerant supply pipe
56: Refrigerant discharge pipe 57: Second horizontal partition
58: Refrigerant discharge / exhaust port 59: Hook-shaped recess
60: Refrigerant passage 6: Sealing wall member
7a: Upper space 7b: Lower space
7c: Front space part 7d: Lower front space part

Claims (8)

A mold cooling structure that cools the periphery of the cooling chamber by circulating a fluid refrigerant in a cooling chamber provided inside the mold,
A flow control means for controlling the flow of the refrigerant in the cooling chamber is installed inside the cooling chamber, and the flow control means is a portion that flows relatively quickly to the flow of the refrigerant flowing along the inner wall surface of the cooling chamber. A mold cooling structure characterized in that a difference in heat taken from the mold around the cooling chamber can be partially differentiated by generating a portion that is not and a portion that is not. The cooling chamber is formed inside a mold diverter provided at a forward facing position of a plunger tip that moves forward in the injection sleeve and presses the molten metal,
The flow control means is formed of a horizontal partition material that defines an internal space of the cooling chamber into an upper space portion and a lower space portion, and a vertical partition material that defines the lower space portion to the left and right, and discharge of the refrigerant. The outlet is made to penetrate the vertical partition member and face the front space formed between the vertical partition member and the front wall of the cooling chamber, and the refrigerant discharge port seals the opening of the cooling chamber. Provided on the sealing wall member, the refrigerant discharged from the refrigerant discharge port is circulated from the front space portion through the upper space portion toward the refrigerant discharge port, and the portion extending from the front space portion to the upper space portion is circulated. By making the flow rate of the refrigerant relatively high, the amount of heat taken from the mold can be differentiated between the periphery of the cooling chamber from the front space to the upper space and the cooling chamber of the other part. The shunt according to claim 1, Cooling structure of.   The refrigerant wall exhaust port for discharging bubbles generated in the cooling chamber to the outside of the sealing wall member in a portion corresponding to the upper space portion of the cooling chamber is provided. The cooling structure of the shunt described.   3. The second horizontal partition member is protruded from the vertical partition member facing the front space portion toward the front wall of the cooling chamber at a position lower than the refrigerant discharge port. The cooling structure of the shunt described.   A refrigerant discharge pipe is concentrically disposed outside the refrigerant supply pipe provided with the refrigerant discharge port, and a refrigerant discharge port is formed between the outer periphery of the refrigerant supply pipe and the inner circumference of the refrigerant discharge pipe. The cooling structure of the diverter according to claim 2, wherein the structure is a cooling structure.   3. The cooling structure for a diverter according to claim 2, wherein the lower space is defined in a plurality of chambers by the plurality of vertical partition members. The cooling chamber is formed inside a mold diverter provided at a forward facing position of a plunger tip that moves forward in the injection sleeve and presses the molten metal,
The flow control means defines an internal space of the cooling chamber into an upper space portion formed between the upper wall portion of the cooling chamber and a front space portion formed between the front wall and the remaining portion is The coolant discharge port is formed at a position facing the front space portion of the defined block material, which is formed of a defined block material having a sealing wall portion that contacts the inner wall of the cooling chamber and seals the opening of the cooling chamber. Forming a refrigerant discharge port in the sealing wall corresponding to the upper space, and circulating the refrigerant discharged from the refrigerant discharge port from the front space through the upper space to the refrigerant discharge port 2, wherein the amount of heat taken from the mold can be differentiated between the periphery of the cooling chamber extending from the front space portion to the upper space portion and the periphery of the cooling chamber of other portions. The cooling structure of the shunt described.   The cooling of the current divider according to claim 7, wherein a second lateral partition member is provided to project toward the front wall of the cooling chamber at a position below the refrigerant discharge port and facing the front space portion. Construction.

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