JP5686075B2 - Die casting mold - Google Patents

Description

  In this specification, the technique regarding a die-casting metal mold | die is disclosed.

  In the die casting mold, a cooling path is provided inside the die casting mold, and the die casting mold is cooled by flowing a cooling medium through the cooling path. Alternatively, the die casting mold is cooled by spraying a cooling medium from the outside of the die casting mold toward the die casting mold.

  In Patent Document 1, nozzles for ejecting a cooling medium toward a die casting mold are provided at a plurality of locations of the die casting mold, and the ejection amounts of these ejection nozzles can be individually adjusted, and cooling is performed at the time of casting performed immediately before. For the jet nozzles located at positions where it was observed that there was a shortage, the amount of jet was increased, and for the jet nozzles located at positions where it was observed that there was excessive cooling during the casting performed immediately before A technique for reducing the ejection amount is disclosed.

  In Patent Document 2, the cooling path provided in the die casting mold is branched into a plurality of branches, and a temperature measuring device and a flow rate adjusting device are provided at the outlet of each branch path, and the temperature measured by each temperature measuring device. A technique for adjusting the flow rate of each flow rate adjustment valve so as to be uniform is disclosed.

JP-A-57-124666 Japanese Patent Laid-Open No. 9-85387

  The prior art focuses on cooling during steady state operation where casting operations are repeated. However, actually, there is a time when the operation is started, and there is a time when the temperature of the die casting mold that has been cooled to about room temperature is raised. In other words, it is necessary to raise the temperature of the die casting mold to the temperature during steady operation by casting with a die casting mold that has been cooled to about room temperature. It becomes possible.

  In the case of casting with a die-casting die cooled to about room temperature, it is necessary to raise the temperature of the die-casting die, so a measure to keep the cooling medium from flowing can be considered. However, although it is cooled to about room temperature, since the molten metal is poured and cast, there is a possibility that the die casting mold may be damaged if the cooling medium is not flowed. On the other hand, although it is necessary to cool it when it enters the steady operation period, there is a part where it is desired to quickly raise the temperature of the die casting mold by not flowing the cooling medium during the temperature raising period.

  Conventional techniques are not suitable for cooling during the temperature raising period. The technique of Patent Document 1 performs feedback control based on the measurement result at the time of casting performed immediately before. This technique is a cooling technique in a steady operation period in which casting operations are performed one after another after the temperature rise of the die casting mold is completed, and is not an effective cooling technique in the temperature raising period. Even if the technique of Patent Document 1 is applied to a die-casting mold that is being heated, the portion to be cooled is cooled, but the portion where the temperature is to be rapidly raised cannot be quickly raised by not cooling.

  The technique of Patent Document 2 is the same. Even if the technique of Patent Document 2 is applied to a die-casting mold that is being heated, the portion to be cooled is cooled while the portion that is to be quickly heated is not cooled. The temperature cannot be raised quickly.

  In the conventional cooling technique, the cooling path is fixed. In a die-casting mold that is being heated, a portion that is to be cooled is cooled even while the temperature is being raised, while a portion that is desired to be rapidly heated cannot be left uncooled. In order to protect the die casting mold, it is necessary to cool where it should be cooled. In the conventional cooling technique, as a result, the temperature is increased to the point where the temperature increase should be promoted, so that the temperature increase rate of the portion where the temperature increase is required is slow. The number of castings of castings whose quality is not guaranteed is increasing.

  In the technique described in the present specification, even if the temperature is being raised, the portion to be cooled is cooled, while the portion where the temperature is desired to be rapidly raised is not cooled, and the temperature is quickly raised. This reduces the number of castings required to raise the temperature to a temperature at which a casting with stable quality can be cast with a die casting mold. Reduce the number of so-called abandonments.

  In the die-casting mold according to claim 1, the cooling path formed inside includes a cooling path at low temperature through which the cooling medium flows when the die-casting mold is low temperature, and a cooling medium flows when the die-casting mold is at low temperature. There is no distinction between high temperature cooling paths. The die casting mold is provided with a temperature dependent valve. The temperature dependent valve prohibits the cooling medium from flowing into the cooling path when the die casting mold is at a low temperature. Allow to flow to the cooling path at high temperature. When the die casting mold becomes hot, the cooling medium may not flow through a part of the low temperature cooling path, or the cooling medium may continue to flow through the low temperature cooling path.

  According to the above-mentioned die casting mold, a cooling path is provided at a low temperature at a place where cooling is necessary even when the temperature of the die casting mold is being raised. On the other hand, it is possible to quickly raise the temperature by not providing a low-temperature cooling path at a location where cooling is not required during the temperature rise of the die casting mold. It is possible to reduce the number of times of discarding performed to raise the temperature of the die casting mold to a temperature suitable for casting.

  According to the second aspect of the present invention, one actuating member is arranged at a branching point or a junction of the low temperature cooling path and the high temperature cooling path. The actuating member constitutes a temperature dependent valve. When the die casting mold is at a low temperature, the low temperature cooling path and the high temperature cooling path are shut off, and at the same time, the low temperature cooling path is opened. The low temperature cooling path and the high temperature cooling path are opened, and at the same time the low temperature cooling path is shut off.

  When the high temperature cooling path branches off from the low temperature cooling path, the flow resistance of the high temperature cooling path is higher than the flow resistance of the low temperature cooling path downstream from the branch point, so the low temperature cooling path and the high temperature cooling path Even if the path is opened, a sufficient amount of the cooling medium may not flow in the high temperature cooling path. According to the above die casting mold, when the die casting mold becomes high temperature, a sufficient amount of the cooling medium is allowed to flow through the high temperature cooling path in order to prevent the cooling medium from passing through the low temperature cooling path. it can.

  In the die casting mold according to the third aspect, a thermostat that opens and closes depending on the temperature of the cooling medium is used for the temperature dependent valve. It is possible to realize a die-casting die that has few failures and is easy to maintain and manage.

  According to the die casting mold described in the present specification, it is possible to reduce the number of disposals required to raise the temperature of the die casting mold cooled to about room temperature to the temperature during steady operation. The time until steady operation is possible can be shortened.

The structure common to the die-casting die 2 of Example 1 to Example 5 is shown typically. The enlarged view of the vicinity of the bypass path 8b at the time of low temperature of Example 1 is shown. (A) shows the case where a cooling medium is low temperature, (b) shows the case where a cooling medium is high temperature. The enlarged view of the vicinity of the 1st branch path 12a of Example 2 is shown. (A) shows the case where a cooling medium is low temperature, (b) shows the case where a cooling medium is high temperature. The enlarged view of the vicinity of the bypass path 8b at the time of low temperature of Example 3 is shown. (A) shows the case where a cooling medium is low temperature, (b) shows the case where a cooling medium is high temperature. The enlarged view of the vicinity of the bypass path 8b at the time of low temperature of Example 4 is shown. (A) shows the case where a cooling medium is low temperature, (b) shows the case where a cooling medium is high temperature. The enlarged view of the vicinity of the 1st branch path 12a of Example 5 is shown. (A) shows the case where a cooling medium is low temperature, (b) shows the case where a cooling medium is high temperature. The die-cast metal mold | die 52 of Example 6 is shown typically.

The main features of the embodiments shown below are listed.
(Characteristic 1) The die-casting die of the embodiment includes a temperature-dependent valve that switches a cooling path arranged in the die-casting die depending on the temperature of the die-casting die. The temperature of the die casting mold here may be the temperature of the cooling medium flowing through the cooling path in the die casting mold in addition to the temperature of the die casting mold itself.
(Characteristic 2) A magnitude relationship is established between the flow resistance of the cooling path at low temperature and the flow resistance of the cooling path at high temperature, and the cooling path is switched by opening and closing one place of the cooling path.
(Characteristic 3) At the branching point or confluence point of the cooling path, the operation of closing one path and opening the other path at the same time is performed by one actuating member. Switching to the desired cooling path regardless of the diameter of the cooling path.
(Feature 4) By arranging two temperature-dependent valves, a desired cooling path is switched regardless of the diameter of the cooling path.
(Feature 5) In the sixth embodiment, each thermostat installed in each high-temperature cooling path operates independently.
(Characteristic 6) In the sixth embodiment, each thermostat installed in each high-temperature cooling path can be disposed at any location in each high-temperature cooling path.

FIG. 1 schematically shows a configuration common to the die casting molds 2 from the first embodiment to the fifth embodiment. As illustrated in FIG. 1, a cooling path is formed in the die casting mold 2, and the cooling path is classified into a low temperature cooling path 8 and a high temperature cooling path 12. In order to illustrate the division between the low temperature cooling path 8 and the high temperature cooling path 12, the low temperature cooling path 8 is indicated by a dotted line, and the high temperature cooling path 12 is indicated by a one-dot chain line.
The high temperature cooling path 12 branches from the low temperature cooling path 8 at the branch point 16, and joins the low temperature cooling path 8 at the junction 18.

The low-temperature cooling path 8 includes three paths: a low-temperature upstream path 8a, a low-temperature bypass path 8b, and a low-temperature downstream path 8c. The low temperature upstream path 8a is a section from the cooling medium supply port 6 to the branch point 16, the low temperature bypass path 8b is a section from the branch point 16 to the merge point 18, and the low temperature downstream path 8c is the merge point 18. To the cooling medium discharge port 14.
The high temperature cooling path 12 includes a first branch path 12a, a second branch path 12b, a third branch path 12c, a fourth branch path 12d, a high temperature upstream path 12e, and a high temperature downstream path 12f. The straight path from the branch point 16 to the point b4 is a section of the high temperature upstream path 12e, and the straight path from the point j4 to the junction 18 is the high temperature downstream path 12f. The first branch path 12a branches from the high temperature upstream path 12e at the branch point b1 and is connected to the high temperature downstream path 12f at the junction j1, and the second branch path 12b passes from the high temperature upstream path 12e at the branch point b2. The third branch path 12c branches from the high temperature upstream path 12e at the junction b3 and connects to the high temperature downstream path 12f at the junction j3. The fourth branch path 12d is a path from the point b4 to the point j4. Here, a section from the branch point 16 to the branch point b1 in the high temperature upstream path 12e is a high temperature upstream common path 12e1, and a section from the junction j1 to the junction 18 in the high temperature downstream path 12f is a high temperature downstream common path. 12f1.

A temperature dependent valve 10 is installed at the branch point 16. The temperature dependent valve 10 opens and closes depending on the temperature of the cooling medium flowing through the cooling path. The arrangement of the temperature dependent valve 10 is not limited to the branch point 16, and various arrangements are possible depending on the shape of the cooling path. Specifically, it will be described in accordance with an embodiment described later. When the temperature dependent valve 10 opens and closes when the temperature of the cooling medium is a constant temperature _Tc , a path through which the cooling medium flows is determined at the branch point 16. For the temperature dependent valve 10, for example, a thermostat or the like is used.

When the temperature of the cooling medium is equal to or lower than the constant temperature _Tc , the cooling medium supplied from the cooling medium supply port 6 of FIG. 1 flows through the low temperature cooling path 8 and is discharged from the cooling medium discharge port 14. It does not flow through the cooling path 12 at high temperatures. The low-temperature cooling path 8 passes through a portion that needs to be cooled even at the start of operation using the low-temperature die casting mold 2. Even if the die-casting mold 2 is at a low temperature, the portion that needs to be cooled is cooled by the low-temperature cooling path 8. While the temperature of the cooling medium is low, the cooling medium does not flow through the cooling path 12 when the temperature is high. The high-temperature cooling path 12 does not need to be cooled while the die-casting die 2 is at a low temperature, and passes through a portion that needs to be cooled when it rises to the temperature during steady operation. While the temperature of the cooling medium is low, the part that does not need to be cooled is not cooled, and the die casting mold 2 is quickly raised to the temperature during steady operation.

By injecting molten metal into the cavity 4 and repeating casting, the temperature of the mold rises and the temperature of the cooling medium rises. When the temperature of the cooling medium exceeds a certain temperature _Tc , the cooling medium supplied from the cooling medium supply port 6 flows through the low temperature upstream path 8 a and flows into the high temperature upstream path 12 e at the branch point 16. The coolant flowing into the high temperature upstream path 12e flows through the first branch path 12a, the second branch path 12b, the third branch path 12c, and the fourth branch path 12d, and flows through the high temperature downstream path 12f at the junction 18. It flows into the downstream path 8c at the time of low temperature and is discharged from the cooling medium discharge port 14. Cooling water, cooling oil, cooling air, or the like is used as the cooling medium.

  In the first to fifth embodiments, the cooling medium flows through the low temperature bypass path 8b only at low temperatures. On the other hand, the cooling medium flows in the low temperature upstream path 8a and the low temperature downstream path 8c at both low and high temperatures. The term “cooling path at low temperature” as used herein refers to a cooling medium that flows at least at a low temperature, and does not mean that it does not flow at a high temperature.

FIG. 2 shows an enlarged view of the vicinity of the low temperature bypass path 8b in the first embodiment. The low-temperature cooling path 8 between the branch point 16 and the junction 18 is thick and short and has a low flow resistance. The high temperature cooling path 12 between the branch point 16 and the junction 18 is thin and long and has a high flow resistance. The thermostat 22 is arranged at an arbitrary location on the low temperature bypass path 8b in the figure. Thermostat 22 opens below a certain temperature _{T c,} it closes above a certain temperature _{T c.}

FIG. 2A schematically shows a state in which the temperature T of the cooling medium is equal to or lower than a certain temperature _Tc , and the operating member of the thermostat 22 opens the low-temperature cooling path 8 in the low-temperature bypass path 8b. . In this case, since the flow resistance of the high temperature cooling path 12 is high, most of the cooling medium flows through the low temperature cooling path 8 and does not flow through the high temperature cooling path 12.

FIG. 2B schematically shows a state in which the temperature T of the cooling medium is equal to or higher than a certain temperature _Tc , and the operating member in the thermostat 22 blocks the low temperature cooling path 8 in the low temperature bypass path 8b. Yes. In this case, the entire amount of the cooling medium flows through the high-temperature cooling path 12. The cooling medium that has flowed through the high-temperature cooling path 12 flows into the low-temperature downstream path 8c at the junction 18 and is discharged from the cooling medium discharge port 14 in FIG.

FIG. 3 shows an enlarged view of the vicinity of the first branch path 12a in the second embodiment. The diameter of at least a part of the low temperature bypass cooling path 8 b is made smaller than the diameter of the high temperature cooling path 12. In this embodiment, a thermostat 24 is used as the temperature dependent valve 10. The thermostat 24 is disposed at an arbitrary position of the high temperature upstream common path 12e1 or the high temperature downstream common path 12f1. Thermostat 24 closes below a certain temperature _{T c,} opens above a certain temperature _{T c.}

FIG. 3A shows that the cooling medium temperature T is equal to or lower than a certain temperature _Tc , and the operating member of the thermostat 24 blocks the high temperature cooling path 12 in the high temperature upstream common path 12e1 or the high temperature downstream common path 12f1. Is schematically represented. In this case, since the operating member of the thermostat 24 blocks the high-temperature cooling path 12, the cooling medium flows through the low-temperature cooling path 8. It does not flow through the cooling path 12 at high temperatures.

FIG. 3B shows that the cooling medium temperature T is equal to or higher than the constant temperature _Tc , and the operating member of the thermostat 24 opens the high temperature cooling path 12 in the high temperature upstream common path 12e1 or the high temperature downstream common path 12f1. Is schematically represented.
In this case, since the operating member of the thermostat 24 opens the high-temperature cooling path 12, the cooling medium flows to the high-temperature upstream path 12 e having a small flow resistance at the branch point 16, and enters the low-temperature bypass path 8 b having a large flow resistance. Not flowing. The cooling medium flows through the high-temperature cooling path 12 and flows into the low-temperature downstream path 8c at the junction 18 and is discharged from the cooling medium discharge port 14 of FIG. This phenomenon occurs in the same manner regardless of whether the thermostat 24 is arranged in the high temperature upstream common path 12e1 or the high temperature downstream common path 12f1.

  FIG. 4 is an enlarged view of the vicinity of the low temperature bypass path 8b according to the third embodiment. In this embodiment, the operating member of the thermostat 26 is arranged at the branch point 16. As will be described later, the thermostat 26 opens and closes two paths with one operating member.

FIG. 4A shows that the cooling medium temperature T is equal to or lower than a constant temperature _Tc , and the operating member of the thermostat 26 opens between the low temperature upstream path 8a and the low temperature bypass path 8b, and at the same time, the low temperature upstream path 8a A mode that the space | interval between the upstream common path | routes 12e1 at the time of high temperature is interrupted | blocked is represented typically. In this case, since the operating member of the thermostat 26 interrupts the high temperature cooling path 12, the cooling medium flowing through the low temperature upstream path 8 a flows through the low temperature cooling path 8 as it is at the branch point 16.

FIG. 4B shows that the coolant temperature T is equal to or higher than the constant temperature _Tc , and the operating member of the thermostat 26 blocks between the low temperature upstream path 8a and the low temperature bypass path 8b, and at the same time, the low temperature upstream path 8a A mode that the space | interval between the upstream common path | routes 12e1 at the time of high temperature is open | released is represented typically. In this case, since the operating member of the thermostat 26 opens the high-temperature cooling path 12, the cooling medium flowing through the low-temperature upstream path 8 a passes through the high-temperature upstream path 12 e at the branch point 16 as shown in FIG. Flow into. The cooling medium that has flowed through the high-temperature cooling path 12 flows into the low-temperature downstream path 8c at the junction 18 and is discharged from the cooling medium discharge port 14 in FIG.

  In this embodiment, the relationship between the diameter of the low temperature cooling path 8 and the diameter of the high temperature cooling path 12 may be any relationship.

  FIG. 5 shows an enlarged view of the vicinity of the low temperature bypass path 8b of the fourth embodiment. In this embodiment, the operating member of the thermostat 28 is disposed at the junction 18. As will be described later, the thermostat 28 opens and closes two paths with one operating member.

In FIG. 5A, the cooling medium temperature T is equal to or lower than a constant temperature _Tc , and the operating member of the thermostat 28 opens between the low temperature bypass path 8b and the low temperature downstream path 8c, and at the same time, the low temperature downstream path 8c A mode that the space | interval between the downstream common path | routes 12f1 at the time of high temperature is interrupted | blocked is represented typically. In this case, since the operating member of the thermostat 28 blocks the high-temperature cooling path 12, the cooling medium flows through the low-temperature cooling path 8.

FIG. 5B shows that the coolant temperature T is equal to or higher than the constant temperature _Tc , and the operating member of the thermostat 28 blocks between the low temperature bypass path 8b and the low temperature downstream path 8c. A mode that the space | interval between the downstream common path | routes 12f1 at the time of high temperature is open | released is represented typically. In this case, since the operating member of the thermostat 28 opens the high temperature cooling path 12, the cooling medium flowing through the low temperature upstream path 8 a flows into the high temperature upstream path 12 e at the branch point 16. The cooling medium that has flowed through the high temperature cooling path 12 flows into the low temperature downstream path 8c at the junction 18 and is discharged from the cooling medium discharge port 14 of FIG.

  In this embodiment, the relationship between the diameter of the low temperature cooling path 8 and the diameter of the high temperature cooling path 12 may be any relationship.

The actuating member 26 used in FIG. 4 and the actuating member 28 used in FIG. 5 may be separated into two temperature dependent valves. FIG. 6 shows an enlarged view of the vicinity of the first branch path 12a in the fifth embodiment. In this embodiment, a thermostat 30 and a thermostat 32 are used for the two temperature dependent valves. The thermostat 30 is disposed at an arbitrary position on the high temperature upstream common path 12e1 or the high temperature downstream common path 12f1. The thermostat 32 is arrange | positioned in the arbitrary locations of the low temperature bypass path 8b. Thermostat 30 closes below a certain temperature _{T c,} opens above a certain temperature _{T c.} Thermostat 32 is open at below a certain temperature _{T c,} it closes above a certain temperature _{T c.}

FIG. 6A shows a case where the cooling medium temperature T is equal to or lower than a certain temperature _Tc. The operating member of the thermostat 30 blocks the high temperature cooling path 12 in the high temperature upstream common path 12e1 or the high temperature downstream common path 12f1. The state in which the operating member of the thermostat 32 opens the low-temperature cooling path 8 in the low-temperature bypass path 8b is schematically shown. In this case, the cooling medium flows into the low-temperature cooling path 8 at the branch point 16.

FIG. 6B shows the case where the cooling medium temperature T is equal to or higher than the constant temperature _Tc , and the operating member of the thermostat 30 opens the high temperature cooling path 12 in the high temperature upstream common path 12e1 or the high temperature downstream common path 12f1. The state in which the operating member of the thermostat 32 blocks the low-temperature cooling path 8 in the low-temperature bypass path 8b is schematically shown. In this case, the cooling medium flowing through the low temperature upstream path 8 a flows into the high temperature upstream path 12 e at the branch point 16. The cooling medium that has flowed through the high-temperature cooling path 12 flows into the low-temperature downstream path 8c at the junction 18 and is discharged from the cooling medium discharge port 14 in FIG. This phenomenon occurs in the same manner regardless of whether the thermostat 30 is disposed in the high temperature upstream common path 12e1 or the high temperature downstream common path 12f1.

  In this embodiment, the relationship between the diameter of the low temperature cooling path 8 and the diameter of the high temperature cooling path 12 may be any relationship.

  A plurality of high-temperature cooling paths may be prepared. In this case, a temperature dependent valve is installed in each high temperature cooling path. FIG. 7 shows a die casting mold 52 in the sixth embodiment. Since the cooling mechanism of the die casting mold 52 in FIG. 7 overlaps with the cooling mechanism of the die casting mold 2 in FIG. 1, the same or similar members are denoted by the reference numbers of the die casting mold 2 in FIG. A duplicate description is omitted by using a number obtained by adding 50 to. First, the configuration of the die casting mold 52 will be described only with respect to differences from the die casting mold 2, and then a specific example will be described.

In the case of the die-casting mold 52, the low temperature bypass path 8b existing in FIG. 1 is removed. Instead, the high temperature upstream path 12e and the high temperature downstream path 12f constitute a part of the low temperature cooling path 58. In order to illustrate the division between the low temperature cooling path 58 and the high temperature cooling path 62, the low temperature cooling path 58 is indicated by a dotted line, and the high temperature cooling path 62 is indicated by a one-dot chain line.
In the die-cast mold 52, a plurality of high-temperature cooling paths 62a, 62b, 62c, and 62d are formed. Thermostats 60a, 60b, 60c, and 60d are disposed in the high-temperature cooling paths 62a, 62b, 62c, and 62d, respectively. The thermostat 60a to the thermostat 60d block the high temperature cooling path when the temperature is lower than the switching temperature, and open the high temperature cooling path when the temperature is equal to or higher than the switching temperature. When the temperature at which the thermostat 60a opens and closes is Ta, the temperature at which the thermostat 60b opens and closes is Tb, the temperature at which the thermostat 60c opens and closes is Tc, and the temperature at which the thermostat 60d opens and closes is Td, Ta to Td may be equal or different. It may be allowed.
The thermostat 60a to the thermostat 60d open the high temperature cooling path 62d from the high temperature cooling path 62a in a state where the cooling medium does not flow from the high temperature cooling path 62a to the high temperature cooling path 62d. The thermostat 60a to the thermostat 60d open and close at the temperature of the die casting mold 52, not at the temperature of the cooling medium.

  When any of the thermostats 60a, 60b, 60c, 60d is less than the open / close temperature, the cooling medium supplied from the cooling medium supply port 56 flows through the low temperature cooling path 58 and is discharged from the cooling medium discharge port 64. . On the other hand, when any one of the thermostats 60a, 60b, 60c, and 60d is heated above the opening / closing temperature, a high-temperature cooling path that passes through the portion is opened and the cooling medium flows out. The cooling medium that has flowed through the high temperature cooling path returns to the low temperature cooling path 58 and is discharged from the cooling medium discharge port 64.

  Each of the thermostats 60a, 60b, 60c, 60d may be arranged at any position on the high temperature cooling path.

  As in the above embodiment, a temperature-dependent valve that switches the cooling path according to the temperature of the mold or the cooling medium is installed in the cooling path, so that the part that needs to be cooled is reliably cooled while the temperature needs to be raised. Can be quickly heated. Thereby, the number of times of discard can be reduced.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

2: Die casting mold 4: Cavity 6: Cooling medium supply port 8: Low temperature cooling path 8a: Low temperature upstream path 8b: Low temperature bypass path 8c: Low temperature downstream path 10: Temperature dependent valve 12: High temperature cooling path 12a : First branch path 12b: second branch path 12c: third branch path 12d: fourth branch path 12e: high temperature upstream path 12f: high temperature downstream path 12e1: high temperature upstream common path 12f1: high temperature downstream common path 14 : Cooling medium outlet 16: Branch point 18: Junction point 22: Thermostat 24: Thermostat 26: Thermostat 28: Thermostat 30: Thermostat 32: Thermostat 52: Die-casting die 54: Cavity 56: Cooling medium supply port 58: Cooling at low temperature Path 60a: Thermostat 60b: Thermostat 60c: Thermostat 60d: Thermo Stat 62a: First high temperature cooling path 62b: Second high temperature cooling path 62c: Third high temperature cooling path 62d: Fourth high temperature cooling path 64: Cooling medium outlet b1: Branch point b2: Branch point b3: Branch Point b4: Point j1: Junction point j2: Junction point j3: Junction point j4: Point

Claims (3)

The cooling path formed in the die-casting mold is divided into a low-temperature cooling path where the cooling medium flows when the die-casting mold is cold and a high-temperature cooling path where the cooling medium does not flow when the die-casting mold is cold. Has been
Die-casting die that has a temperature-dependent valve that prohibits the cooling medium from flowing into the cooling path at high temperatures when the die-casting mold is cold and allows the cooling medium to flow into the cooling path at high temperatures when the die-casting mold becomes hot Type.   At the junction or junction of the low temperature cooling path and the high temperature cooling path, when the die casting mold is at a low temperature, the low temperature cooling path and the high temperature cooling path are disconnected, and at the same time the low temperature cooling path is opened, and the die casting mold 2. The die casting mold according to claim 1, wherein when the temperature of the die becomes high, a single operating member is disposed that opens the low temperature cooling path and the high temperature cooling path and simultaneously blocks the low temperature cooling path.   The die-casting die according to claim 1 or 2, wherein the temperature dependent valve is a thermostat that opens and closes depending on the temperature of the cooling medium.

Images