JPH08168848A - Cooling passage structure of casting mold - Google Patents

Abstract

PURPOSE: To facilitate the mounting and the demounting works of a metallic mold by improving the connecting structure of a cooling water passage between a metallic mold mounting plate and a metallic mold. CONSTITUTION: The cooling water supplying and draining passage 23 is arranged to the metallic mold mounting plate 5, and this cooling water supplying and draining passage 23 and the cooling passage 22 in the metallic mold 7a integrally joined with the metalli mold mounting plate 5 are faced at a joining surface (p) and connected with a joint tube 26 fitting O rings 27 at the outer peripheries at both ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a cooling passage for easily attaching and detaching a die to a die mounting plate of a casting die.

[0002]

2. Description of the Related Art In order to improve productivity, improve accuracy, and extend life of products in die casting, the surface layer of the molten metal is rapidly solidified by using a die with high heat conduction, and the surface layer is shell-shaped. Conventionally, a casting method is known in which the mold is opened when it is solidified. In such die casting, it is necessary to appropriately control the die temperature and always open the die in a constant solidified state.There are many cooling passages in the die for finely controlling the die temperature. It is provided.

For example, FIGS. 7 and 8 are a front view (FIG. 7) and a side view (FIG. 8) viewed from the cavity surface side of the movable die 100.
As an example, the vertical runner 104, the horizontal runners 105, 105 leading to the sprue 103, the product shape portion 1 are provided on the cavity surface C of the mold 102 attached to the front surface of the mold mounting plate 101.
When the parts 06 and 106 are formed, the cooling passages 107 are stretched around the vertical runner 104, the horizontal runner 105, the product shape portion 106 and the like.

Cooling water is introduced into or discharged from the cooling passages 107 through cooling hoses 108 connected to both side portions of the mold 102, and the cooling hoses 108.
7 are gathered on both side surfaces of the die mounting plate 101 on the rear surface side as shown in FIG. 7 and connected to a manifold or the like (not shown).

[0005]

However, in the prior art, when the mold 102 is removed from the mold mounting plate 101 in the repair or inspection of the mold 102, all the cooling hoses 108 ... Are replaced by the mold 102. It has to be removed from the side, which is very laborious and time consuming.

[0006]

In order to solve the above problems, the present invention provides a cooling water supply / discharge passage for a mold mounting plate and a cooling passage for a mold integrally joined to the mold mounting plate. In the cooling passage structure of the casting die that is connected, one end of the die mounting plate communicates with the cooling water supply / discharge passage, and the other end has a connection hole that opens to the joint surface with the die. Then
In addition, one end of the mold is communicated with the cooling passage, and the other end is formed with a connection hole that opens at a position corresponding to the connection hole of the mold mounting plate. The joint hole was used to connect to the connecting hole. Here, as the joint pipe, for example, a straight pipe having an O-ring on the outer circumference is used.

[0007]

Operation: One end of the joint pipe is fitted into the cooling water supply / discharge passage of the mold mounting plate, and the other end is fitted into the cooling passage of the mold for connection. At this time, each passage and the joint pipe are sealed with respective O-rings. By connecting through the joint pipe in this way, the mold positioning function can be exerted, and when the mold is removed from or attached to the mold mounting plate, the joint pipe can be detached with one touch. Further, for example, even when there is a difference in thermal expansion between the mold mounting plate and the mold, it can be absorbed by the joint pipe, and water leakage does not occur. And by making the shape of the joint pipe straight, the mold can be removed,
Installation becomes easier.

[0008]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a configuration diagram showing an entire casting system to which a casting die according to the present invention is applied, FIG. 2 is a vertical sectional view in which a cavity portion of the casting die is sectioned, and FIG. 3 is A- in FIG. FIG. 4 is a front view of the movable die viewed from the direction A, and FIG.

The casting apparatus adopting the cooling passage structure according to the present invention is applied to a casting mold of a system for fully automatically casting a steering knuckle which is a component of an automobile as shown in FIG. , A shell-shaped solidified layer is formed on the surface of the molten metal by a copper mold with high thermal conductivity,
So-called QC that opens the mold and dispenses when the interior is not solidified
Uses the (quick casting) process.

A casting device 1 is arranged substantially in the center of the above casting system. The casting device 1 is composed of a fixed mold 2 and a movable mold 3, and a fixed mold 2 is provided upstream of the casting device 1. A pouring station 40 for pouring the molten metal into the product cavity formed when the movable mold 3 and the movable mold 3 are closed is provided.

This pouring station 40 is equipped with a pressure pouring furnace 4
1, a load cell 42, and a ladle 43 that receives molten metal discharged from the pressure pouring furnace 41 and pours the molten metal into the casting apparatus 1, and the load cell 42 sets the amount of molten metal in the ladle 43 to a constant amount. After that, the ladle 43 is cast into the casting device 1
It is moved up and poured into the product cavity from the sprue.

Further, in the pressure pouring furnace 41, the molten metal produced in the melting furnace 44 arranged further upstream is conveyed to the ladle 4.
I will supply it at 5. Further, an additive measuring device 50 for adding an additive such as magnesium for spheroidizing graphite to the molten metal is provided above the casting device 1, and adjacent to the additive measuring device 50, a cavity is provided. A blow smoke device 51 for applying a release agent to the surface is provided so as to be vertically movable.

Further, above the downstream side of the casting apparatus 1, a work take-out robot 5 for taking out a cast product from the opened mold.
2 is provided so as to be movable in the horizontal direction, and the cast product taken out is transferred to the straightening / cutting device 53.

After the trimming and the like is performed by the straightening / cutting device 53, the transfer robot 54 transfers it to the heat treatment furnace 55. In the figure, reference numeral 56 is a filter exchanging device for exchanging a filter for removing slag or the like arranged in the runway, for example, for every shot.

On the other hand, as shown in FIG. 2, the casting apparatus 1 comprises a fixed die 2 and a movable die 3, and the fixed die 2 and the movable die 3 are clamped by respective die mounting plates 4 and 5. Cast with 6 and 7. Here, the mold mounting plates 4 and 5 are made of cast iron or steel, and the molds 6 and 7 are made of copper alloy having excellent thermal conductivity. When the fixed mold 2 and the movable mold 3 are clamped,
A cavity 8 is formed on the mold matching surface of each mold 6, 7.

As shown in FIG. 3, the cavity 8 on the movable mold 7 side is composed of a plan portion 8a provided at the center and a pair of product portions 8b, 8b provided on both sides. 8a is a hot water pool 11 connected to the sprue 10 and a vertical runner 1
2, horizontal runners 13 and 13 that are separated from the bottom of the vertical runners 12 to the left and right, and communication runners 14 and 14 that are connected to the ends of the horizontal runners 13 and 13.

Filters 15 and 15 for removing impurities in the molten metal are installed in the middle of the horizontal runners 13 and 13, and the product portion 8b is provided.
Is molded according to the product shape of the steering knuckle,
Further, as shown in FIG. 2, a metal core 16 and a cast core 17 for forming a through hole in a part of the product shape face in the product portion 8b. The metal core 16 is fixed to the movable mold mounting plate 5, and the metal core 16 is inserted into the core insertion hole 7 of the movable mold 7.
The core a is inserted through the core a, and the cast-out core 17 is freely retractable in the product portion 8b by the cylinder unit 18. In addition, in FIG. 2, 20 and 21 are push-out pins.

By the way, when the operation of pouring the molten metal into the cavity 8 and casting is repeated, the plan portion 8a which comes into contact with the molten metal at a high temperature first and the product portion 8b which comes into contact with the molten metal in a slightly cooled state The degree of thermal wear is different from that of the mold part 8a, and the repair frequency of the plan part 8a is higher.
7 is divided into a plurality of split dies so that the die replacement work at the time of repair can be easily performed. That is, as shown in FIG. 3, the movable mold 7 has an inverted T-shaped first split mold 7a corresponding to the central and lower plan parts 8a, and left and right product parts 8b, 8b.
To the second and third split molds 7b and 7c corresponding to
It is divided along with and made of copper alloy of the same material.
When the plan portion 8a is worn or the like, the first split mold 7
Only a can be replaced easily. Incidentally, this division structure is the same for the fixed mold 6.

By the way, the fixed mold 2 and the movable mold 3 are provided with a heating mechanism and a cooling mechanism for controlling the temperature of the molten metal in the cavity 8, and the heating mechanism is embedded in the respective molds 6, 7. It is composed of a heater and the cooling mechanism is each mold 6, 7
Cooling passages 22 ... and cooling water supply for each mold mounting plate 4, 5
Discharge passage 23 (FIGS. 2 and 4) and manifolds 24, 2
4 (FIG. 4) and the like. That is, as shown in FIG. 4, the manifolds 24, 24 are provided on both side surfaces of the mold mounting plates 4, 5, and are connected to the cooling passages 22 ... Or the cooling water supply / discharge passages 23. The extended cooling hoses 25 ... Are gathered together.

Here, in the embodiment, the structure of the cooling passage for the first split mold 7a and the structure of the cooling passage for the second and third split molds 7b, 7c are different from each other, and the first split mold 7a having a high replacement frequency is used. Adopts the passage structure of the present invention so as to be easily attached and detached, and the passage structure for the second and third split molds 7b and 7c is kept the same as before. That is, the passage structure for the second and third split molds 7b, 7c is the cooling hose 25 ...
Is connected to both side surfaces of the movable mold 7.
The passage configuration of the present invention for the split mold 7a is such that the passage is configured through the joint surface p between the movable mold mounting plate 5 and the movable mold 7, and the cooling water supply / discharge passage 23 of the movable mold mounting plate 5 is formed.
... and the cooling passages 22 of the movable mold 7 are connected by joint pipes 26.

That is, one end of the die mounting plate 5 is connected to the cooling water supply / discharge passage 23, and the other end is formed with a connecting hole 30 opening to the joint surface p with the movable die 7. The mold 7 is formed with a connecting hole 31 having one end communicating with the cooling passage 22 and the other end opening at a position corresponding to the connecting hole 30 of the mold mounting plate 5, and the connecting hole 30 of the mold mounting plate 5 is formed. The connection hole 31 of the movable mold 7 is connected with the joint pipe 26.

As shown in FIG. 5, the joint pipe 26 is formed in a straight shape by fitting O-rings 27, 27 at both ends, one end side of which is inserted into the cooling water supply / discharge passage 23 and the other end thereof. The side is connected to the cooling passage 22 by inserting it. Further, as shown in FIG. 6, the joint pipe 26 has a female screw portion 30a formed in the connecting hole 30 on the movable die mounting plate 5 side.
You may make it screw-engage with this female screw part 30a. However, when the difference in thermal expansion between the movable mold mounting plate 5 and the movable mold 7 is large, the type of FIG. 5 that can absorb the difference in expansion is advantageous.

By the way, the cooling water supply / discharge passage 23 and the cooling passage 22 are not provided with the joint pipe 26, but the joint surface p is simply brought into close contact with the cooling water supply / discharge passage 23 and the cooling passage 22 to communicate with each other. A method of sealing the joint surface p around the passage with a seal member is also conceivable, and such a method was actually adopted, but in this case, water leakage occurred and it was not successful.

The operation of the cooling passage structure as described above will be described. The fixed mold 2 and the movable mold 3 are clamped to fill the molten metal in the cavity 8, and cooling water is introduced into the cooling passage 22 to cool it rapidly. At this time, the manifold 24
Part of the cooling water that has passed through is sent from the cooling water supply / discharge passages 23 of the mold mounting plates 4 and 5 to the cooling passages 22 of the first split mold 7a through the joint pipe 26, and the plan portion 8a. After cooling the molten metal, the molten metal is discharged to the manifold 24 through the cooling water supply / discharge passages 23 ... Also, the manifold 24
The cooling water supplied to the cooling hose 25 via the
It is sent to the cooling passages 22 of the third split molds 7b, 7c,
After cooling the molten metal of the product parts 8b, 8b, the cooling hose 25
And is discharged to the manifold 24.

When the plan portion 7a is damaged and needs to be repaired, the first split mold 7a is removed from the movable mold mounting plate 5. At this time, it is sufficient to pull out the joint pipes 26 ... Also, when installing it, just insert it. That is, the work such as replacement is extremely simplified. Further, since there is a slight clearance between the joint pipe 26 and the cooling passage 22 or the cooling water supply / discharge passage 23, the difference in thermal expansion can be absorbed. Moreover, the joint pipe 26 also exerts a positioning function. Of course, the passage configuration of the second and third split molds 7b and 7c may be performed from the joint surface p as in the present invention.

[0026]

As described above, in the cooling passage structure according to the present invention, the cooling water supply / discharge passage of the die mounting plate and the cooling passage of the die are connected by the joint pipe on the joint surface. The work of removing and mounting the mold becomes extremely easy. Further, by adopting the insertion method using the joint pipe, it is possible to eliminate water leakage even when there is a difference in thermal expansion, and it is possible to exert the positioning function. If the joint pipe is straight, the attaching and detaching work becomes easier.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an entire casting system to which a casting mold according to the present invention is applied.

FIG. 2 is a vertical cross-sectional view showing a cross section of a cavity of a casting device.

FIG. 3 is a front view of the movable type seen from the direction AA of FIG.

FIG. 4 is a plan view of a movable die with a partial cross section.

FIG. 5 is an enlarged view of the joint pipe, (A) shows a state where the mold is removed, and (B) shows a state where the mold is attached.

FIG. 6 is a diagram showing another example of the structure of the joint pipe.

FIG. 7 is a front view of a conventional movable type.

FIG. 8 is a side view of a conventional movable type.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Casting device, 5 ... Movable mold mounting plate, 7 ... Movable mold, 2
2 ... Cooling passage, 23 ... Cooling water supply / discharge passage, 26 ... Joint pipe, 27 ... O-ring, 30, 31 ... Connection hole, p ... Joining surface.

Front page continued (72) Inventor Masaaki Kurosawa 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd.

Claims (2)

[Claims] 1. A cooling water supply / discharge passage for a die mounting plate,
In the cooling passage structure of a casting die, which is connected to a cooling passage of a die integrally joined to the die mounting plate, one end of the die mounting plate communicates with a cooling water supply / discharge passage. Then, a connecting hole is formed at the other end of the mold, the connecting hole opening at the joint surface with the mold, and the mold has one end communicating with the cooling passage and the other end at a position corresponding to the connecting hole of the mold mounting plate. A cooling passage structure for a casting mold, wherein connecting holes that are open are formed, and the connecting holes of the mold mounting plate and the connecting holes of the mold are connected by a joint pipe. 2. The cooling passage structure for a casting mold according to claim 1, wherein the joint pipe has an O-ring on an outer periphery thereof and has a straight shape. .