JPH05237624A - Device for heating and cooling metallic mold for casting - Google Patents

Abstract

PURPOSE:To suitably heat and cool the developing position of casting defect in a metallic mold in good responsiveness and to reduce the reconstruction cost of the metallic mold. CONSTITUTION:In this device, a heat conductive body 10 having heat radiating fins at the tip part, a heater 20 arranged at the outer peripheral surface of the heat conductive body 10 in order to heat the heat conductive body 10 and a pipe 30 for circulating cooling water attached to the heat conductive body 10 in order to circulate the cooling water in a hole 12 formed in the heat conductive body 10 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for locally heating and cooling a casting die.

[0002]

2. Description of the Related Art Shrinkage cavity defects that occur in castings,
The defect in the molten metal is caused by the improper temperature distribution of the mold, and therefore, conventionally, the temperature of the mold is controlled by using the following means. a. A water cooling pipe is installed in the mold, and cooling water is flowed through this pipe to lower the temperature of the mold. b. A coiled heater is embedded in the mold, and the heater is energized to raise the temperature of the mold.

[0003]

Since the above-mentioned conventional means controls the temperature of the entire mold or a relatively wide part, it is difficult to properly set the temperature of the local part of the mold. Therefore, the occurrence of casting defects cannot be sufficiently prevented.

Further, since a wide area of the mold is heated or cooled, the temperature cannot be controlled with good responsiveness even if a computer is used as the control means, and moreover, a water cooling pipe or a heater is directly arranged on the mold. Since it is installed, it takes time and money to modify the mold.

In view of the above situation, an object of the present invention is to make it possible to properly heat and cool the portion of the die where the casting defect occurs in the die, and to easily attach the die to the die. A mold heating and cooling device is provided.

[0006]

A heating / cooling device according to the present invention comprises a heat conductor attached to a portion of a mold where temperature control is required, a heater attached to the heat conductor, and the heat conductor. And a means for circulating a cooling fluid.

[0007]

The heat conductor is heated and cooled by the heater and the cooling fluid. Therefore, by arranging the heat conductor in a portion of the mold where temperature control is required, heat exchange of the portion is performed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The heating / cooling device for a casting die according to the present invention, as shown in FIG.
And a heater 20 disposed on the outer peripheral surface of the heat conductor 10.
A cooling water circulation pipe 30 attached to the heat conductor 10, and a heat insulating material 40 covering the periphery of the heat conductor 10.

The heat conductor 10 is made of a material having good heat conductivity, such as copper, copper alloy, aluminum, and aluminum alloy. The heat conductor 10 has a radiation fin 11 on its tip surface.
And a hole 12 for circulating cooling water is formed therein. Further, at the tip of the heat conductor 10, the thermocouple 5 is arranged along the heat radiation fin 10a.
0 is supported, and this thermocouple 40 has a temperature control unit 60.
It is connected to the. The hole 12 is provided along the front-rear direction of the heat conductor 10, and one end of the hole 12 is open at the rear end surface of the heat conductor 10.

The heater 20 is composed of a heating wire wound around the outer surface of the heat conductor 10, and one end and the other end thereof are connected to the temperature control section 60.

The cooling water circulation pipe 30 is an inner pipe 31.
And an outer pipe 32 fitted to the inner pipe 31, and the outer pipe 32 of the inner pipe 31 and the inner peripheral face of the outer pipe 32 are appropriately spaced from each other. , 32 are set. The inner tube 31 has its tip positioned near the tip surface of the hole 12, and the outer tube 32 has its tip fitted and fixed to the opening peripheral edge of the hole 12. The inner pipe 31 and the outer pipe 32 are connected to the tank 80 via the flexible tube 70 shown in FIG.

A pump 90 is interposed between the inner pipe 31 and the tank 80, and cooling water 100 cooled by a cooling means (not shown) is stored in the tank 80.

In the heating and cooling apparatus of the above embodiment, when the heater 20 is energized, the heater 20
The heat generated in 1 passes through the heat conductor 10 and is radiated from the heat radiation fin 11.

On the other hand, when the pump 90 is driven, the cooling water 100 in the tank 80 is pumped into the inner pipe 31 of the cooling water circulation pipe 30. The cooling water 100 sent to the inner pipe 31 is discharged from the tip of the inner pipe 31 into the hole 12 of the heat conductor 10, as shown by the arrow, and then the hole 12 and the inner pipe 31 It is returned to the tank 80 through the pipes 32. Therefore, the heat conductor 10
Is cooled by the cooling water 100 circulating inside,
As a result, the radiation fin 11 absorbs heat in the vicinity thereof. The thermal loss in the heat conductor 10 is reduced as much as possible by the heat insulating action of the heat insulating material 40.

The heating / cooling device of the above embodiment is mounted on the die 110 in the manner as illustrated in FIG. That is,
Part 111a in the cavity 111 of the mold 110
When casting defects such as shrinkage cavities occur in the die 110,
An insertion hole 112 having an appropriate depth is formed from the side surface to the portion 111a. In the heating / cooling device, the heat radiation fin 10a of the heat conductor 10 has the portion 111a.
Is inserted into the hole 112 in such a manner that it is positioned at the back of the hole.

By the heating and cooling device, the portion 111
When it is necessary to increase the temperature of a, the temperature control unit 60 causes the heater 20 to generate heat, and conversely, when it is necessary to decrease the temperature of the portion 111a, the control unit 60 performs the above operation. The pump 90 is driven.

That is, the temperature control unit 60 includes the thermocouple 40.
Temperature of the part 111a detected by the
The deviation from the target temperature set by 1 is detected, and the supply current to the heater 20 or the rotation speed of the pump 90 is controlled so as to eliminate this deviation.
The temperature of 11a is maintained at the target temperature. The target temperature is naturally set to a value that can prevent the casting defect from occurring.

Since the heating / cooling device of the above embodiment is constructed extremely compactly, it is possible to locally heat and cool the site where the casting defect occurs in the die 110. Further, the mold 110 can be set without making a large-scale modification, and the temperature control response is high.

In the above embodiment, the rotation speed of the pump 90 is controlled to change the circulating flow rate of the cooling water. However, even if the pump 90 is on / off controlled, that is, the cooling water is intermittently controlled. Can also obtain the same temperature setting action as above.

The heating / cooling device of the above embodiment can be effectively applied not only to the temperature control of the casting mold but also to the temperature control of the mold used for resin molding and the like.

[0021]

According to the present invention, it is possible to heat and cool the casting defect occurrence site in the mold properly and with good responsiveness, and moreover, it is possible to easily mount the mold without major modification. it can.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a heating / cooling device according to the present invention.

FIG. 2 is a cross-sectional view illustrating a state in which the heating / cooling device of the embodiment is mounted on a mold.

[Explanation of symbols]

 10 Heat Conductor 11 Radiating Fin 12 Hole 20 Heater 30 Cooling Water Circulation Pipe 31 Inner Tube 32 Outer Tube 40 Insulation Material 50 Thermocouple 60 Temperature Control Section 80 Tank 90 Pump 100 Cooling Water 110 Mold 111 Cavity 112 Insertion Hole

Claims (1)

[Claims] 1. A heat conductor attached to a portion of a mold where temperature control is required, a heater mounted on the heat conductor, and means for circulating a cooling fluid in the heat conductor. Heating and cooling device for casting molds.