JPH105968A - Gas-venting structure in mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the development of defective gas, etc., in the inner part of a casting by securing a necessary gas venting quantity. SOLUTION: The structure of gas-venting in a mold is constituted in such a manner that at the time of pouring of molten metal into the mold, the gas in the mold is vented to the outside. In such a case, a member holding mechanism 28 for holding plural members 24, 26 as it is in the combined state and gaps S for gas venting formed between the mutually combined members. By this structure, the holding of the members 24, 26 with the member holding mechanism 28 is released and the gap S for gas venting can surely be cleaned by separating these members 24, 26. Therefore, the gas-venting quantity with time is not lowered and the development of gas defect, etc., in the inner part of the casting can be prevented. Further, this structure can be used to various kinds of molds by adjusting number and width of the gaps for gas-venting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degassing structure of a mold for releasing gas in the mold to the outside when a molten metal is poured into the mold.

[0002]

2. Description of the Related Art In a die casting machine, as shown in FIG. 5 (A), when a molten metal Y is filled into a cavity 3 by an injection plunger 2, it is generated from air or a release agent in the cavity 3. A gas venting structure 4 for discharging a gas or the like is required. Further, the degassing structure 4 is also required to have a function of preventing the molten metal Y filled in the cavity 3 from blowing out. The technology related to this is disclosed in
No. 411, and FIGS. 5B and 5C show a perspective view and an enlarged plan view of the porous body 4 relating to the gas release structure. The porous body 4 is formed by bundling a plurality of pipe-shaped thin tubes 5 and fusing them. By adjusting the number of the thin tubes 5 to be bundled, a necessary gas release amount can be secured. Further, the molten metal Y filled in the cavity 3 is solidified in the process of passing through the capillary 5, so that the capillary 5 is automatically closed. For this reason, a shut-off pin for shutting off the gas vent passage, a drive mechanism thereof, and the like are not required, and the gas vent structure can be simplified.

[0003]

However, the above-mentioned porous body 4 cannot be disassembled because of the structure in which a plurality of thin tubes 5 are bundled by fusing, and the inside of the thin tubes 5 is sufficiently cleaned. It is difficult. For this reason, there is a problem that the amount of degassing of the mold decreases with time, and internal gas defects and the like in the casting easily occur. The technical problem of the present invention is to make it possible to disassemble the gas vent passage so that the inside of the passage can be reliably cleaned, so that the gas vent amount does not decrease over time so that the internal gas defect of the casting can be prevented. This is intended to prevent the occurrence of the problem.

[0004]

The above object is achieved by a mold vent structure having the following components. That is, the invention according to claim 1 is characterized in that, when a molten metal is injected into a mold, a plurality of members combined with each other in a state where the plurality of members are combined in a mold degassing structure in which gas in the mold is released to the outside. It has a member holding mechanism for holding the member as it is, and a gas vent clearance formed between members combined with each other. Therefore, by releasing the holding of the members by the member holding mechanism and separating the members, the gap for degassing can be reliably cleaned. Therefore, the amount of degassing does not decrease with time, and the occurrence of internal gas defects and the like in the casting can be prevented. Further, by adjusting the number and width of the gas venting gaps, the molds can be used for various molds.

[0005] Further, the invention according to claim 2 is based on claim 1.
In the mold degassing structure described in the above, the member holding mechanism is a structure for holding a plurality of plate materials in a stacked state,
The gap for degassing is characterized in that it is formed by processing a groove in the plate material or by inserting a spacer between the plate materials. Therefore, the structure is simple, the disassembly and assembly are easy, and no trouble is required for cleaning the gap.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] A degassing structure of a mold according to a first embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a longitudinal sectional view of a main part of a die casting machine having a gas vent structure according to the present embodiment, and FIG. 2 is a perspective view showing the gas vent structure according to the present embodiment. FIG. 3 is a longitudinal sectional view showing a state in which the outflow of the molten metal is stopped by the gas release structure according to the present embodiment. A die casting machine 10 according to the present embodiment includes a fixed mold 11 attached to a fixed die plate and a movable mold 12 attached to a movable die plate, as shown in FIG. In the state where the mold is clamped, a cavity 13 which is a product molding portion is formed inside the dies 11 and 12.

Further, at the position of the parting surface 15 of the clamped dies 11, 12, the molten metal passage 1 for introducing the molten metal Y pressed by the plunger tip 11t into the cavity 13.
3a and a gas vent passage 13b for discharging gas generated from the air and the mold release agent in the cavity 13 are formed. And, the gas release passage 13b is movable mold 1
It communicates with the exhaust passage 12 b formed in the inside 2 through the laminated vent 14.

The laminated vent 14 is a member relating to the degassing structure of the present embodiment, and as shown in FIG. 2A, a plurality of degassing plates 24 and one flat plate 26, and those plates It is composed of a bolt & nut 28 which connects 24 and 26 in an overlapped state. The degassing plate 24 is a thin plate having a flat rectangular shape, and the surface thereof has a depth of 0.
A groove 24m of 1 mm to 0.2 mm is formed with a predetermined width.
Further, through holes 24k for passing the bolts 28b are formed at the four corners of the gas vent plate 24. The flat plate 26
Is a thin plate having the same planar shape as the gas release plate 24, and has through holes 26k formed at the four corners for passing the bolts 28b. The groove is not formed in the flat plate 26.

In the laminated vent 14, the number of degassing plates 24 to be used can be freely changed according to the degassing amount of the mold. Generally, ten or more degassing plates 24 are used. Each degassing plate 24 is stacked such that the grooves 24 m face in the same direction, and a flat plate 26 is stacked on the top of the stacked degassing plates 24. Then, in this state, the degassing plate 2
4. Through holes 24k and 26k provided at four corners of flat plate 26
The bolt 28b is passed through and the nut 28m is tightened. As a result, the columnar laminated vent 14 is assembled, and a gap S for venting is formed in the columnar laminated vent 14 in the front-rear direction by the number of gas venting plates 24. Therefore, by adjusting the number of gas vent plates 24 according to the volume of the cavity 13, a necessary gas vent amount can be ensured and various molds can be accommodated. Here, the depth of the groove 24m, ie,
The size of the gap S (0.1 mm to 0.2 mm) is set so that the molten metal Y that is going to pass through the gap S can be solidified in the middle.

Further, since the laminated vent 14 has a structure in which the four corners of the laminated plates 24 and 26 are fixed by bolts and nuts 28, the laminated vent 14 has high strength and is not deformed or broken by casting pressure. Further, the through holes 24 of the plates 24 and 26 are provided.
By pulling out the bolt 28b from k and 26k, the laminated vent 14 can be easily disassembled. That is, the bolt & nut 28 functions as the member holding mechanism of the present invention.

Next, the operation of the laminated vent 14 will be described while explaining the operation of the die casting machine 10. First, a mold clamping mechanism (not shown) operates to operate the molds 11 and 12.
Of the mold is performed. Next, the plunger sleeve 11b
Is supplied to the plunger tip 11.
It is pushed into the cavity 13 by t. In the process of pushing the molten metal Y into the cavity 13, the air generated in the cavity 13 and the gas generated from the release agent flows from the gas release passage 13 b of the parting surface 15 to the gap S of the laminated vent 14.
And is discharged to the exhaust passage 12b of the movable mold 12.

The molten metal Y filled in the cavity 13 in this way reaches the position of the laminated vent 14 from the gas vent passage 13b of the parting surface 15 as shown in FIG. Try to pass S.
However, the melt Y that is going to pass through the gap S is cooled by the mold 12 and the laminated vent 14, and solidifies in the gap S. As a result, the gap S between the laminated vents 14 is closed, and the molten metal Y does not flow out of the molds 11 and 12. When a predetermined time has passed in this way and the molten metal Y in the dies 11 and 12 solidifies, the mold is opened, and the cast product is removed from the dies 11 and 12.

As described above, the laminated vent 14 is provided with the plate 2
The bolts 28b can be disassembled by pulling out the bolts 28b from the through holes 24k and 26k of the holes 4 and 26.
Can be cleaned sufficiently. Therefore, the amount of degassing does not decrease with time as in the prior art, and the occurrence of gas defects and the like inside the casting can be prevented. In addition, by adjusting the number and width of the gas release gap S, it can be used for various molds 11 and 12.

Here, in the present embodiment, the gap S for degassing the laminated vent 14 is formed by using the degassing plate 24 having a groove 24m on the surface, as shown in FIG. 2 (B). As described above, it is also possible to alternately stack the flat plate 26 and the pair of spacers 27 to form the gap S having a dimension equal to the thickness of the spacer 27. In the present embodiment, an example in which the laminated vent 14 is mounted on the movable mold 12 has been described. However, the exhaust path 12b can be mounted on the fixed mold 11 by forming the exhaust passage 12b in the fixed mold 11. Needless to say.

[Second Embodiment] FIG. 4 is a perspective view showing a gas venting structure 34 according to a second embodiment of the present invention. The gas venting structure 34 according to the present embodiment has pipes 34b to 34e having different diameters inside a large-diameter pipe 34a.
Are sequentially stored, and are positioned substantially coaxially with bolts and nuts or the like (not shown) separated from each other by a constant gap S.

Here, the gap S between the pipes 34a to 34e
Is set to such a size that the molten metal Y passing therethrough can be solidified in the middle. In addition, the pipe 3
The size and the number of 4a to 34e are set to the size and the number that can secure a necessary gas release amount. Thus, also in the present embodiment, by adjusting the number of the gaps S and the like in the same manner as in the case of the gas vent structure according to the first embodiment, it can be used for various molds. Also,
By removing bolts and nuts, each pipe 34b
To 34e can be easily separated.

The embodiments of the present invention have been described above. However, it should be noted that the embodiments of the present invention have the following technical matters in addition to the technical matters described in the claims. Please note. (1) In the degassing structure of a mold according to claim 1, the member holding mechanism inserts a cylindrical body having a smaller diameter than the cylindrical body into the cylindrical body and holds the cylindrical body in a state of being positioned substantially coaxially. The mold degassing structure.

[0018]

According to the present invention, since the clearance for degassing can be sufficiently cleaned, the amount of degassing does not decrease with time, and the occurrence of gas defects and the like in the casting can be prevented. Can be. Further, by adjusting the number and width of the gap, it becomes possible to cope with various molds.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a die casting machine having a gas release structure according to a first embodiment of the present invention.

FIG. 2 is a perspective view illustrating a gas vent structure according to the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a state in which outflow of molten metal is stopped by a gas release structure according to the first embodiment of the present invention.

FIG. 4 is a perspective view illustrating a gas vent structure according to a second embodiment of the present invention.

FIG. 5 is a vertical sectional view of a main part of a conventional die casting machine, a perspective view showing a gas vent structure, and a plan view.

[Explanation of symbols]

 S Gap for gas release 11 Fixed mold (mold) 12 Movable mold (mold) 14 Stacked vent (gas release structure) 24 Gas release plate (member) 24 m groove 26 Flat plate (member) 27 Spacer 28 Bolt & nut (member) Holding mechanism)

Claims (2)

[Claims] 1. A member holding mechanism for holding a plurality of members combined with each other in a combined state in a mold degassing structure in which a gas in the mold is released to the outside when a molten metal is injected into the mold. And a gap for degassing formed between the members combined with each other. 2. The gas release structure of a mold according to claim 1, wherein the member holding mechanism is configured to hold a plurality of plate members in an overlapped state, and the gap for degassing has a groove formed in the plate member. A mold degassing structure formed by processing or by inserting a spacer between plate materials.