JP2000263210A - Casting metallic mold using block fittable/removable and casting method using block fittable/removable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize casting operation, to prevent the development of laps and casting flash caused by leakage of molten metal and to improve the quality of a product by fitting one block which plants plural plate-like fins so as to be fixed and fittable/removable to a holding part, to a metallic mold and inserting the fins into the other block during casting. SOLUTION: In the block, many planar fins 30 are inserted and held in as almost parallel state so as to be formed as the rectangular state. Each fin 30 is inserted one by one between the fin holding plates 20. The fin holding plates 20 are held with a holding member 22 and fixed by fastening connecting bolt and nut arranged at both ends of the holding member 22. When the fin holding plates 20 are mutually adhered closely, a gap for fitting and interposing the fin 30 is formed between them. This gap is kept even in the case of loading the force to a thrust direction from the outer part. The thickness of the fin 30 is made to about 0.8 mm and the interval between the fins 30 is made to about 3.2 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting mold using a removable block and a casting method using a removable block.

[0002]

2. Description of the Related Art In recent years, various electronic components have been mounted on electric vehicles, personal computers, and the like, and have been widely used. These electronic components have been further reduced in size and weight. However, for example, in a CPU (Central Processing Unit) used in a personal computer, the number of clocks has significantly increased, and the amount of heat generated has inevitably increased. I have. Therefore, it is necessary to radiate heat to electronic components as efficiently as possible. As a general method, heat is radiated by mounting as many thin radiating plates (fins) as possible in a limited narrow space. I have. Under such circumstances, a heat exchanger having a large number of thin fins having a high heat exchange ratio is desired.

[0003] Metal members having fins used for heat exchange are usually manufactured by the following various methods A to D. A: Cut the extruded product. B: Join the fin to the planar base member (screw
Tack, caulking, etc.). 8 and 9 show examples in which the fins are fixed by caulking. That is, FIG. 8 shows a state in which fins are mounted, and FIG. 9 shows a state in which many fins are mounted on the base portion. C: Cast integrally. D: Insert the fins into the base member and cast (in many cases, die casting).

Among these methods, the method of cutting an extruded product A has high heat transfer efficiency, but since it is an extruded product having the same cross section, it requires mechanical processing such as cutting and cutting and has many restrictions on the shape. It may be difficult to double as the function of the structural member. The method of joining fins to the base member of B has a high degree of freedom in terms of shape, but since it is a separate member, the heat transfer resistance of the fin joint tends to be high, so the heat transfer efficiency may be low. is there. Also, the mechanical strength of the joint is low in reliability. In particular, there is a high possibility of falling off due to vibration. The method using the integral casting of C has a very high degree of freedom in terms of shape, but it is difficult to reduce the thickness and spacing of the fins due to the casting technology (poor filling, decreased durability of the mold, etc.). The heat transfer area in the inside is smaller than A and B in the previous section, and the heat transfer efficiency is inferior. The method of casting with the fins of D inserted has a high degree of freedom in terms of heat conduction efficiency and shape, but the process of inserting the fins into the mold is difficult and requires a lot of skill, and it takes a lot of time. Is hard to be constant,
There is a problem in production technology, which is disadvantageous in quality and cost. Also, it is hard to say that the maintenance and durability of the mold are good.

[0005] Among the above methods A to D, if the method of casting by inserting the fins of D can solve various production technical problems, the degree of freedom of design, manufacturing cost, product quality, etc. can be reduced. It can be evaluated as an excellent method in terms of surface.

[0006]

Here, the following six points summarize the technical problems to be overcome in the method of inserting and casting the fin of D. (1) To insert fins in die casting, operate the casting machine and open the mold attached to the casting machine (after casting, open the mold and take out the cast product). The fin must be inserted into the fin fitting portion formed in the mold. This fitting portion is manufactured so that there is almost no gap with the fins in order to prevent molten metal from flowing during casting to form a so-called burr. For this reason, it is extremely difficult to quickly and surely insert the plate-like fins therein, and a high degree of skill is required.
Automating this task is not impossible, but requires the resolution of many technical obstacles and significant costs.

(2) Since a large number of fins are usually provided, it takes a considerable time to completely insert the fins, so that a reasonable productivity cannot be expected. (3) Further, the difficulty of the insertion operation varies greatly between the individual fins due to dimensional errors of the individual fins and the individual fitting portions, and so the fins are inserted after the mold is opened. Is not constant until all of them are completed. That is, the casting cycle time fluctuates because the time during which the mold is open fluctuates, and it becomes difficult to keep the mold temperature constant, and the casting conditions fluctuate. It will be difficult.

(4) The fin insertion operation must be performed by an operator entering a space created by opening the mold, that is, an extremely dangerous area. Even if the safety of the casting machine is reliable, working for a long time in such a region imposes a great psychological burden on the operator, which is not preferable as a working environment. (5) The fin fitting portion is extremely small, and it is easy for burrs and metal debris to fit therein, and it is easy to hinder the insertion of the fins. Therefore, it is necessary to frequently perform cleaning work. For this reason, the work is difficult, and since the number is large, a lot of time is required, which causes a decrease in productivity and quality. (6) Since the fin fitting portion and its periphery are formed by a thin plate-shaped member corresponding to the fin gap due to the structure of the mold, it is difficult to maintain sufficient strength as the mold. Therefore, with the repetition of the casting operation, the possibility of deformation and breakage due to casting pressure, heat shock, etc. is extremely high as compared with other portions, and the life of the mold is thereby shortened.

Therefore, a first object of the present invention is to provide a casting mold for performing casting using a detachable block in order to overcome the problem of a method of casting by inserting fins. A second object of the present invention is to provide a casting method capable of performing efficient casting using a removable block.

[0010]

According to the first aspect of the present invention, there is provided a casting mold for casting a product for heat exchange comprising a plurality of plate-like fins for heat exchange implanted. The first object is achieved by using a detachable block characterized in that a portion of the mold into which the fin is inserted is a block detachable from the mold body.

According to a second aspect of the present invention, in the casting mold for casting a product for heat exchange in which a plurality of plate-like fins for heat exchange are planted according to the first aspect of the present invention, The first object is achieved by forming a portion of the casting mold into which the fin is inserted into a block detachable from the mold body.

According to a third aspect of the present invention, in the second aspect of the present invention, the block is configured such that the fin fits and holds the fins between the respective holding portions even when an external force is applied by the fastener. Is formed, thereby achieving the first object.

According to the fourth aspect of the present invention, a plurality of plate-like fins are implanted in a rectangular shape with respect to the holding portion, and the fins are
A plurality of blocks that can be fixed and released by a fastening tool provided on the base material that fixes the holding portion and that are held in a state in which they can freely move in the strip-shaped row direction,
The first object is achieved by performing a step of inserting a fin into another block while the one block is mounted on the mold and performing the casting step.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. FIG.
FIG. 2 is a plan view of the block 10 according to the present embodiment, and FIG. 2 is a side view thereof. As shown in FIG. 1, a large number of planar fins 30 are insert-held substantially parallel to each other so as to form a strip. FIG. 3 is an enlarged view of a portion indicated by A in FIG. The fins 30 are inserted and held between the fin holding plates 20. Thus, each fin 30 has one
And between the fin holding plate 20. The fin holding plate 20 is held by a holding member 22 and is fixed by tightening connection bolts 24 and nuts 26 provided at both ends of the holding member 22. And
When the fin holding plates 20 come into close contact with each other, a gap is formed between the fin holding plates 20 to fit and hold the fins 30 therebetween.
This gap is maintained even when a force in the thrust direction (arrow in the figure) is applied from the outside. The thickness of the fins 30 is 0.8 mm, and the interval between the fins 30 is 3.2 mm.

On the other hand, when the connecting bolt 24 is loosened, a slight play occurs in the thrust direction (arrow in the figure), so that the fin 30 can be easily inserted. The fin holding plate 20 is provided with a retainer 35 at a position protruding to the opposite side of holding the fin 30, thereby preventing the fin holding plate 20 from being detached from the holding member 22. Note that a spring may be provided between the nut 26 and the holding member 22 in order to firmly tighten the connection bolt.

FIG. 4 is a view showing a state in which the mold is opened. This mold includes a movable mold 40 and a fixed mold 50, and the fixed mold 50 is provided with a guide pin 55, and is engaged with a guide bush 65 provided on the movable mold 40. It folds. In the movable mold 40,
A block 10 to which a number of fins 30 are attached is attached. FIG. 5 is a front view of FIG. 4 and shows the mounting of the block 10 on the movable mold 40. Block 1
0 is installed in the movable mold 40, and the hydraulic cylinder 80
Is pressed and fixed via the moving core 82 and the fastening inclined plate 84 by the force in the direction of the arrow in FIG. Also, the fin holding plate 20 receives the force and holds the fin 30 firmly so as not to fall off. On the other hand, when the pressing of the hydraulic cylinder 80 is released, the block 10 is easily detached from the movable mold 40.

FIG. 6 shows a state in which the movable mold 40 shown in FIG. The molten metal (aluminum) at about 700 ° C. is press-fitted from the gate 90 and cast. At this time, the block 10 is placed in the mold.
Is fixed, so that a product having a shape corresponding to the shape of the block 10 is cast and formed. By clamping the fixed mold 40 and the movable mold 50, the clearance in the mold becomes zero, and fog and burrs due to leakage of the molten metal can be eliminated.

FIG. 7 is a view showing a state where the product is taken out after casting. Block 10 and product removal
This is performed by pushing the push plate 60 with the protruding rod 65. A plurality of such blocks 10 are prepared, and one block 30 is provided.
During the casting step by mounting the fins on the mold, the step of inserting fins into other blocks can be executed in parallel.
By doing so, the work can be performed in a constant cycle, and the manufacturing operation can be performed while the temperature of the mold is kept constant. As a result, the quality of the product can be improved. Also, since the fin holding plate 20 is replaceable,
Even if one sheet is damaged, if it is replaced, it can be used continuously plural times. Furthermore, since it is removable, cleaning can be easily performed.

[0019]

According to the first aspect of the present invention, the casting mold is provided with a block in which the fins are inserted and fitted, which is detachable from the mold body, so that the casting operation is easy and safe. And the quality of the product can be improved. According to the second aspect of the present invention, since the blocks are held so as to be movable in the row direction of the strips, the fins can be easily installed.

According to the third aspect of the present invention, since the gap for fitting and holding the fin is formed between the fins, the fin can be installed simply by inserting the fin. Claim 4
In the described invention, by preparing a plurality of blocks,
Since the work can be continuously performed in a state where the temperature of the mold is kept constant, a high quality product can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a block according to the present embodiment.

FIG. 2 is a side view of the block shown in FIG.

FIG. 3 is an enlarged view of a portion indicated by A in FIG. 1;

FIG. 4 is a view showing a state where a mold is opened.

FIG. 5 is a front view of FIG. 4, showing a block mounted on a movable mold.

FIG. 6 is a view showing a state in which a movable mold is moved and a fixed mold is clamped.

FIG. 7 is a view showing a state where a product is taken out after casting.

FIG. 8 is a view showing a state in which fins are mounted in a conventional technique.

FIG. 9 is a view showing a state in which a large number of fins are mounted on a base portion.

[Explanation of symbols]

 Reference Signs List 10 block 20 fin holding plate 22 holding member 24 connecting bolt 26 nut 30 fin 35 retaining 40 movable mold 50 fixed mold 65 guide bush 80 hydraulic cylinder 82 moving core 84 fastening inclined plate

Claims (4)

[Claims] 1. A casting mold for casting a product for heat exchange comprising a plurality of plate-like fins for heat exchange implanted, wherein a portion of the casting mold where the fin is inserted is fitted. A casting mold using a detachable block, characterized in that the block is detachable from the mold body. 2. The block has a plurality of plate-like fins planted in a strip shape with respect to a holding portion, and the fins are fixed and detached by a fastening tool provided on a base material for fixing the holding portion. 2. A casting mold using a removable block according to claim 1, wherein the mold is held in a state in which it can move freely in a strip-shaped row direction. 3. The block according to claim 2, wherein a gap is formed between the holding portions so as to fit and hold the fin between the holding portions even when an external force is applied by the tightening tool. Casting mold using a removable block. 4. A plurality of plate-like fins are implanted in a strip shape with respect to a holding portion, and the fins can be fixed and detached by a fastener provided on a base material for fixing the holding portion. And a plurality of blocks which are held in a strip-like form so that they can freely move in the row direction. One block is mounted on a mold and the other block is finned while the casting process is being performed. A casting method using a detachable block, wherein a step of inserting a block is performed in parallel.