JPH0120057Y2 - - Google Patents

Description

[Detailed Description of the Invention] The disclosed technology belongs to a technical field in which the thick wall portion of a casting during casting is locally cooled to prevent the occurrence of sink marks and the like.

Therefore, this invention relates to a cooling device attached to a mold, which supplies a coolant to a jacket formed on at least one of a movable mold and a fixed mold that are clamped, and controls the solidification rate during casting. In particular, the tip of the jacket is locally exposed to the thick-walled part of the cavity, and a cold metal is inserted inside the jacket with a small gap around it, and the tip is inserted into the exposed part. The chiller is attached to the mold through an insulating collar, and a coolant is supplied to the chiller during casting to prevent sink marks and the like in the thick-walled portion. This invention concerns a cooling device attached to a mold.

<Prior art> As is well-known, when a molten metal material during casting is solidified in a cavity in a mold to form a predetermined product, thick parts may be affected by cooling temperature differences with other parts during solidification. There was a problem that defects such as so-called shrinkage cavities and cracks occurred.

To deal with this, conventional methods have been to form a jacket in the part of the mold corresponding to the above-mentioned thick part, or to insert a cooling pipe with good thermal conductivity, as shown in Japanese Patent Publication No. 47-512. Accordingly, a mode has been adopted in which a coolant such as water is supplied to the jacket or pipe and the coolant is circulated to promote heat dissipation from the thick walled portion.

<Problem to be solved by the invention> However, the cooling heat generated by the above-mentioned coolant is not only transmitted to the thick part of the solidified part, but also conducts inside the mold and promotes heat dissipation around the thick part. The drawback was that the original local cooling could not be achieved accurately.

The purpose of this invention is to solve the problem of local cooling of molds based on the above-mentioned conventional technology, and
It is an object of the present invention to provide an excellent cooling device that accurately promotes heat dissipation only from the thick portions of molten metal, thereby benefiting the field of mold technology application in the mechanical parts manufacturing industry.

<Means for solving the problem> In order to solve the above-mentioned problems, the structure of this invention, which is in accordance with the above-mentioned purpose and whose gist is the scope of the above-mentioned utility model registration claims, is to solve the above-mentioned problems. A cooling device for a mold in which a cooling pipe is connected to a jacket formed on at least one side of the mold, the tip of the jacket being exposed to the cavity, and the jacket having a cooling metal surrounding it. The cooling pipe is interposed with a gap and faces the cavity, and is connected in a heat-insulated state so as to face the tip of the cavity bored in the cooling metal. The metal is attached to the mold via a heat insulating collar as a cooling device for the mold.

<Function> When molten metal is supplied to a cavity formed by clamping a movable mold to a fixed mold and solidified over a predetermined period of time to form a product, the molten metal is exposed in the cavity corresponding to the thick part of the product. The cooling metal is inserted into the jacket with a small gap around it, with its tip facing the cavity, and the cooling metal is attached to the mold via an insulating collar. The cooling metal is supplied from a cooling pipe connected to its cavity to directly cool the thick walled part to promote heat dissipation. In contrast, technical measures have been taken to prevent defects such as sink marks by reducing the conduction of cold and heat through an insulating collar.

<Example> Next, an example of this invention will be described below based on the drawings.

In the embodiment shown in FIGS. 1 and 2, a cavity 4 is formed by a fixed mold 2 and a movable mold 3, which are clamped by a casting mold. It has a thick-walled portion 4'.

On the other hand, reference numeral 5 denotes a cooling device which constitutes the gist of this invention, and a cooling metal 7 is inserted into a jacket 6 which is bored facing the upper surface of the thick-walled part 4' of the fixed mold 2. The outer periphery of the body having the portion 7' has an even ring-shaped minute gap of Δχ at the base 8 and Δχ' at the tip 9 with respect to the jacket 6, and the tip 10 is connected to the upper surface of the thick-walled portion 4'. The distal end 9 is supported at three points by bosses 11, 11 protruding from the jacket 6 toward the fixed mold 2, as shown in FIG. Formed flange 1
2 is placed in contact with the mold fixing mold 2 through a heat insulating collar 13, and is fastened and fixed with bolts 14.

Incidentally, the gap Δχ' in the tip portion 9 is precisely machined to such an extent that no burrs are generated during casting.

Reference numeral 15 denotes a cooling pipe, one end of which is connected to a pump 16, and the other end of which is inserted through a valve 17 into the cavity 7' of the chiller 7.

Further, 18 is a core which forms a predetermined hole in a casting (molten metal) 19 corresponding to the cavity 4.

In the above configuration, after the movable mold 3 is clamped to the fixed mold 2 for normal casting work, a predetermined amount of molten metal is injected into the formed cavity 4.

During this time, the valve 17 of the cooling device 5 is opened and compressed air as a coolant from the pump 16, which has been activated in advance, is fed to the cooling pipe 15.

Then, the compressed air is blown out from the tip of the pipe 15 into the cavity 7' of the chiller 7 and cools the tip 9 of the chiller 7.

Therefore, the molten metal 1 injected into the cavity 4
Since the upper surface of the molten metal 9 corresponding to the thick-walled portion 4' of the molten metal 9 is brought into direct contact with the tip 10 of the chiller 7, heat radiation is promoted by cold heat conduction from the tip 9.

As a result, the thick portion of the molten metal 19 during solidification is locally sufficiently cooled, and the cooling temperature difference with other portions is forcibly adjusted to prevent casting defects such as shrinkage cavities and cracks.

By the way, the body and flange portion 12 of the chiller 7 have a predetermined minute gap with respect to the fixed mold 2, and are attached via the heat insulating collar 13, so that cold heat does not spread to other parts. It will not be done.

In addition, in the embodiment shown in FIG.
The water as a coolant is pumped from the cooling pipe 15' of the cooling device 5' attached to the cooling plate 2 through the pump 16.
When supplying to the cavity 20' of 0 for local cooling,
The cavity 20' is sealed with a hood 21, and
Another chiller 2 provided for another thick-walled part 4''
In addition, a cooling device 5 is similarly provided for the thick-walled portion 4 on the movable mold 3 side to encourage local heat radiation.

It goes without saying that the embodiments of this invention are not limited to the above-mentioned embodiments. For example, the coolant may be an inert gas, and various other embodiments can be adopted, and the application is not limited to casting but also injection molding. Molding is also possible.

<Effects of the invention> As mentioned above, according to this invention, in the cooling device attached to the mold, local cooling of the thick part of the product (molten metal) is directly achieved by the chiller, so cooling efficiency is high; Further, an excellent effect is achieved in that a desired region can be reliably cooled.

In addition, at this time, the cooling metal is installed with a small gap around the jacket, and its flange is attached to the mold via a heat insulating collar, so that the cooling heat is not transferred to other parts. Spread of heat is prevented, and as a result, it is possible to provide directionality to cooling and promote solidification only in desired areas, which has the effect of eliminating the need to use materials with good thermal conductivity like conventional chillers. .

Therefore, the thick part of the product is solidified without any difference in cooling temperature from other parts, and an excellent effect is achieved in that defects such as so-called shrinkage cavities and cracks do not occur.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of an embodiment of this invention, and the first
The figure is a schematic cross-sectional view of one embodiment, FIG. 2 is a cross-sectional view taken from FIG. 1, and FIG. 3 is a partial cross-sectional view of another embodiment. 4... Cavity, 3... Movable type, 2... Fixed type, 6... Jacket, 15, 15'... Cooling pipe, 1... Mold, 5, 5'... Cooling device, 7...
...cold metal, Δχ, Δχ'... gap, 7'... cavity.

Claims (1)

[Scope of utility model registration request] In a cooling device for a mold in which a cooling pipe is connected to a jacket formed on at least one of a movable mold and a fixed mold that are clamped to form a cavity, the tip of the jacket is exposed to the cavity, and A cooling metal is interposed in the jacket with a small gap around it so as to face the cavity, and the cooling pipe is placed in a heat-insulated state by facing the tip of the cavity bored in the cooling metal. 1. A cooling device for a mold, characterized in that the cooling metal is connected to the mold via a heat insulating collar.