JP2018030149A - Heat sink manufacturing system - Google Patents

Abstract

A heat sink manufacturing system capable of forming a heat-radiating paint film on the surface of a rough material without requiring a large amount of heat energy. A heat sink manufacturing system 200 for manufacturing a heat sink made of a rough material W and a thermal radiation paint film, comprising a first mold 1 and a second mold 2, with a cavity C in a closed state. A casting apparatus 100 including a mold 10 to be defined and a molten metal holding furnace 20 that holds the molten metal provided to the mold 10 is provided. Inside the first mold 1, a thermal radiation paint P is provided. An accommodating portion 40 to be accommodated, a paint flow path 50 that fluidly communicates the accommodating portion 40 and the cavity C, and a heat blocking layer 40a that surrounds the accommodating portion 40 are formed. Further, the paint flow path 50 communicates with the paint flow path 50. An air flow path 60 for supplying compressed air is formed, and the paint flow path 50 is provided with an opening / closing member 70 for switching between closing and opening of the paint flow path 50. [Selection] Figure 1

Description

  The present invention relates to a heat sink manufacturing system for manufacturing a heat sink composed of a rough material and a thermal radiation coating film formed on the surface of the rough material.

  Since recent electric circuits have been downsized and the heat generation density has increased with the downsizing, improvement of the heat dissipation performance of the electric circuit is one of the important development factors.

  In general, an electric circuit having a large calorific value is manufactured by aluminum die casting, and a metal housing has a high heat conductivity but a low heat transfer rate to air.

  Therefore, attempts have been made to form a film made of carbon, nitride, resin, or the like, which is a substance having a high heat transfer coefficient to the air, on the surface of a metal casing.

  Here, Patent Document 1 includes ceramic powder having an average particle diameter of 0.1 to 50 μm and containing zinc oxide powder and / or titanium oxide powder, and a binder, and ceramic powder with respect to 100 parts by mass of the binder component. A heat sink is disclosed in which a heat-radiating paint containing 25 to 100 parts by mass of a component is applied with an average film thickness of 1 to 50 μm.

JP 2012-246365 A

  According to the heat sink described in Patent Document 1, the emissivity in the infrared region is increased by having a film made of a heat-radiating paint, and heat can be efficiently radiated.

  By the way, in the manufacture of the heat sink, after casting a rough material with a molding die, the coarse material is taken out from the molding die, the coarse material is transported to a predetermined application area, and the above-described heat radiation paint is applied to the surface of the rough material. Then, the thermal radiation coating film is formed by baking or volatilization of the solvent to produce the coating.

  However, there is a problem that the temperature of the coarse material is lowered in the process of being taken out from the mold and conveyed and lowered to a temperature lower than the temperature suitable for applying the coating material. Another problem is that the temperature of the coarse material drops to a temperature lower than the temperature suitable for applying the paint during spray coating of the coarse material.

  When the raw material whose temperature has been lowered is placed in a firing furnace and the thermal radiation paint is baked or the solvent is volatilized, the temperature of the coarse material is raised to a temperature suitable for applying the paint, and the paint is further baked or the solvent is evaporated. Therefore, a great deal of heat energy is required.

  The present invention has been made in view of the above-described problems, and relates to a system for manufacturing a heat sink by forming a rough material with a mold and forming a heat-radiating paint film on the surface of the rough material. An object of the present invention is to provide a heat sink manufacturing system capable of forming a heat-radiating paint film on the surface of a rough material while making it unnecessary.

  In order to achieve the above object, a heat sink manufacturing system according to the present invention is a heat sink manufacturing system for manufacturing a heat sink comprising a rough material and a thermal radiation coating film formed on the surface of the rough material, The manufacturing system includes a first mold and a second mold, and includes a mold in which a cavity is defined when the mold is closed, and a molten metal holding furnace that holds the molten metal provided to the mold. The first mold includes an accommodating portion for accommodating the heat-radiating paint, a paint channel that fluidly communicates the accommodating portion and the cavity, and a heat blocking layer that surrounds the accommodating portion. In addition, an air flow path that communicates with the paint flow path and provides compressed air to the paint flow path is formed, and the paint flow path is switched between closing and opening of the paint flow path. Opening and closing member It is what is kicked.

  In the heat sink manufacturing system according to the present invention, a housing part for housing a heat-radiating paint, and a paint channel for fluidly communicating the housing part and the cavity are provided in one mold (here, the first mold) constituting the mold. Immediately after forming and forming the coarse material in the cavity, the thermal radiation paint is discharged onto the surface of the coarse material via the paint flow path, so that the temperature of the coarse material is at a temperature suitable for coating application. A paint can be applied.

  In the conventional manufacturing system, the temperature of the rough material is reduced to a temperature lower than that suitable for paint application in the process of removing the rough material from the mold and transporting the rough material to the coating area. A great deal of heat energy was required to raise the temperature to a suitable temperature. However, in the manufacturing system of the present invention, since there is no conveyance process for conveying the coarse material to the application area, the temperature of the coarse material is used for coating application. It becomes possible to apply the thermal radiation paint at a suitable temperature.

  The temperature of the rough material immediately after being molded in the cavity is higher than the temperature suitable for paint application, but when the rough material reaches a predetermined temperature state (temperature state suitable for paint application), molding is performed. By opening the mold and discharging the heat radiating paint, the coarse material can be removed from the mold with the discharge pressure of the heat radiating paint.

  In forming the coarse material in the cavity, when a high-temperature metal melt including an aluminum melt of about 700 ° C. is injected into the cavity, the first mold and the second mold are also heated. The housing part provided in the first mold contains the heat-radiating paint, but the housing part is surrounded by the heat shielding layer, so that the heat-radiating paint contained in the housing part is made of metal. Sticking with the heat of the molten metal is suppressed.

  It should be noted that a flow path through which a cooling medium such as cooling water circulates at an appropriate location in the first mold (such as around the paint flow path), and the cooling medium is circulated through this flow path, so that the heat of the molten metal is It is possible to suppress heat transfer to the paint flow path through the first mold and fix the heat-radiating paint in the paint flow path.

  The paint channel is provided with an opening / closing member for switching between closing and opening of the paint channel, and when the molten metal is injected into the cavity, the opening / closing member is inserted into the paint channel, The paint channel is blocked. In this way, the paint channel is blocked by the opening / closing member, thereby preventing the injected molten metal from entering the paint channel.

  On the other hand, when the coarse material is molded and the thermal radiation paint is discharged onto the surface of the coarse material, the opening / closing member inserted in the paint flow path is retracted from the paint flow path, and the paint flow path is opened. With the opening of the paint channel, the heat-radiating paint contained in the containing part flows through the paint channel and reaches the vicinity of the outlet of the paint channel.

  Inside the first mold is an air flow path that provides compressed air to the paint flow path, through which the compressed air is provided near the outlet of the paint flow path, and the thermal radiation paint is sprayed by the compressed air. And discharged into the coarse material.

  As described above, when the molten metal is injected into the cavity, the open / close member is inserted into the paint flow path. By this open / close member, the injected molten metal is not only applied to the paint flow path but also to the air flow path. Intrusion is also prevented.

  Here, the switching control in which the open / close member enters the paint flow path to close the paint flow path and the open / close member is retracted from the paint flow path to open the paint flow path is an automatic operation in which the open / close member is moved by an actuator. In addition to the control, manual control in which the opening / closing member is manually moved by the worker may be used.

  When the discharge of the thermal radiation paint is completed, in order to prevent a part of the thermal radiation paint from remaining in the paint flow path and leaning on the wall of the first mold from the outlet of the paint flow path, the end of the discharge of the thermal radiation paint In consideration of the completion of the discharge of the heat radiating paint, the opening and closing member enters the paint flow path, and the heat radiating paint is discharged while moving to the outlet side of the paint flow path. It is preferable to perform discharge control that does not remain.

  As can be understood from the above description, according to the heat sink manufacturing system of the present invention, the housing portion for housing the heat-radiating paint and the housing are housed in one of the molds (here, the first mold) constituting the mold. A paint flow path is formed in fluid communication between the part and the cavity. Immediately after the coarse material is molded in the cavity, a thermal radiation paint is discharged onto the surface of the coarse material via the paint flow path, thereby producing a large amount of thermal energy. The thermal radiation coating can be applied at a temperature suitable for coating the coating of the coarse material.

It is the schematic diagram which showed embodiment of the manufacturing system of the heat sink of this invention. It is the schematic diagram explaining the condition which is inject-molding. It is the schematic diagram explaining the condition which has apply | coated the thermal radiation coating material to the rough material.

  Embodiments of a heat sink manufacturing system according to the present invention will be described below with reference to the drawings.

(Embodiment of heat sink manufacturing system)
FIG. 1 is a schematic view showing an embodiment of a heat sink manufacturing system of the present invention. The manufacturing system 200 shown in the figure includes a casting apparatus 100.

  The casting apparatus 100 includes a molding die 10, a molten metal holding furnace 20 that holds molten metal provided to the molding die 10, and a molten metal supply pipe 30 that provides molten metal from the molten metal holding furnace 20 to the molding die 10. .

  The mold 10 is composed of a first mold 1 and a second mold 2, and a casting cavity C is defined in the mold closed state shown in the figure.

  The molten metal holding furnace 20 contains molten metal such as molten aluminum. In the case of molten aluminum, the internal temperature is about 700 ° C.

  Inside the first mold 1, a heat-radiating paint is accommodated, and the accommodating part 40 surrounded by the heat blocking layer 40 a, the paint channel 50 that fluidly communicates the accommodating part 40 and the cavity C, and the paint channel 50 An air flow path 60 that communicates and provides compressed air near the outlet of the paint flow path 50 is formed. In addition, although the example of illustration has two combinations of these accommodating parts 40, the coating material flow path 50, and the air flow path 60, it may be 1 set or 3 sets or more.

  Around the coating material flow path 50 in the first mold 1, a refrigerant flow path 1a through which a cooling medium such as cooling water flows is further formed.

  In addition, an opening / closing member 70 is disposed behind the accommodating portion 40 (on the side opposite to the cavity C), and an actuator 80 such as a hydraulic cylinder that slides the opening / closing member 70 is disposed at the rear end of the opening / closing member 70. It is installed.

  Here, examples of the heat-radiating paint include polyamideimide (PAI), epoxy paint, and phenol resin.

  Next, a heat sink manufacturing method using the manufacturing system 200 will be outlined with reference to FIGS. Here, FIG. 2 is a schematic diagram illustrating a situation where injection molding is performed, and FIG. 3 is a schematic diagram illustrating a situation where a thermal radiation coating is applied to a rough material.

  In the injection molding into the cavity C, first, as shown in FIG. 2, the actuator 80 is operated to slide the opening / closing member 70 (in the Y1 direction) and is inserted into the paint channel 50, and the tip of the opening / closing member 70 is inserted into the cavity C. Let us face you. In this state, the opening / closing member 70 closes the paint flow path 50 and prevents the molten metal from entering the paint flow path 50 or the air flow path 60 when the molten metal is injection-molded into the cavity C. Can do.

  Next, after applying a release agent to the wall surface of the cavity C of the mold 10, the molten metal is supplied from the molten metal holding furnace 20 to the cavity C of the mold 10 via the molten metal supply pipe 30 (X direction). The crude material is cast in the cavity C.

  By this injection molding, the heat from the molten metal is transferred through the first mold 1, but it is possible to suppress the temperature around the paint flow channel 50 from rising by keeping the coolant flowing through the coolant flow channel 1 a. Thus, it is possible to eliminate the sticking of the heat-radiating paint P passing through the paint channel 50 in the paint channel 50.

  In addition, since the housing portion 40 in which the heat-radiating paint P is housed is surrounded by the heat blocking layer 40a, the heat-radiating paint P in the housing portion 40 is fixed by the heat of the molten metal that has been transferred. can do.

  Next, as shown in FIG. 3, when the molten metal is solidified to form the coarse material W, the mold 10 is opened, the actuator 80 is operated to slide the opening / closing member 70 (Y2 direction). By retreating from the flow path 50 and opening the paint flow path 50, the thermal radiation paint P accommodated in the accommodating portion 40 flows out to the outlet side of the paint flow path 50 (Z1 direction).

  When the radioactive paint P flows out to the outlet side of the paint flow path 50, by providing compressed air to the vicinity of the outlet of the paint flow path 50 via the air flow path 60 (Z2 direction), the thermal radioactive paint P is compressed by the compressed air. It becomes a spray form and is discharged to the coarse material W (Z3 direction).

  The coarse material W is demolded from the wall surface of the cavity C by the discharge pressure when the thermal radiation paint P and compressed air are ejected (Z4 direction), and the thermal radiation paint P is applied to the surface while being removed from the mold. Is done.

  When the discharge of the thermal radiation paint P is completed, a part of the thermal radiation paint P remains in the paint flow path 50 and heat is prevented from falling on the wall surface of the first mold 1 from the outlet of the paint flow path 50. In the final stage of the discharge of the radioactive paint P, taking the completion of the discharge of the thermal radiation paint P into consideration, the opening / closing member 70 enters the paint channel 50 and the thermal radiation paint P is discharged while moving to the outlet side of the paint channel 50. It is preferable to perform discharge control so that the thermal radiation paint P does not remain in the paint flow path 50.

  Thus, according to the illustrated manufacturing system 200, the housing part 40 that houses the thermal radiation paint and the paint flow path 50 that fluidly communicates the housing part 40 and the cavity C are formed inside the first mold 1. Immediately after the coarse material W is formed in the cavity C, the thermal radiation paint P is discharged onto the surface of the coarse material W via the paint flow path 50, so that the temperature of the coarse material W becomes a temperature suitable for coating. Thus, the thermal radiation paint P can be applied.

  In the conventional manufacturing system, the temperature of the rough material is reduced to a temperature lower than that suitable for paint application in the process of removing the rough material from the mold and transporting the rough material to the coating area. Although a great amount of heat energy is required to raise the temperature to an appropriate temperature, the manufacturing system 200 shown in the figure can eliminate the need for a transporting process for transporting the rough material W to the coating region. It is possible to apply the thermal radiation paint P at a temperature suitable for the paint application.

  Further, the heat of the coarse material W can be used to bake the heat-radiating paint P applied to the surface of the coarse material W and to volatilize the solvent. In this case, the baking furnace required in the conventional baking process and the solvent volatilization process becomes unnecessary, and the baking process and the solvent volatilization process become unnecessary, so the production cost of the manufacturing system can be reduced. In addition, the manufacturing efficiency of the heat sink can be significantly improved.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1 ... 1st type | mold, 2 ... 2nd type | mold, 10 ... Molding die, 20 ... Molten metal holding furnace, 30 ... Molten metal supply pipe, 40 ... Accommodating part, 40a ... Heat insulation layer, 50 ... Paint flow path, 60 ... Air flow Road: 70: Opening / closing member, 80: Actuator, 100: Casting apparatus, 200: Manufacturing system (of heat sink), W: Coarse material, P: Thermal radiation paint

Claims (1)

A heat sink manufacturing system for manufacturing a heat sink comprising a rough material and a thermal radiation coating film formed on the surface of the rough material,
The heat sink manufacturing system comprises:
A casting apparatus comprising a first mold and a second mold, the mold defining a cavity when the mold is closed, and a molten metal holding furnace for holding the molten metal provided to the mold. ,
Inside the first mold,
A storage part for storing the heat-radiating paint, a paint channel for fluid communication between the storage part and the cavity, and a heat blocking layer for surrounding the storage part are formed. An air flow path that provides compressed air to the flow path is formed,
A heat sink manufacturing system in which the paint channel is provided with an opening / closing member for switching between closing and opening of the paint channel.

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