JP2002160040A - Sealing structure of piping for metallic mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing structure for piping in a metallic mold which completely prevents penetration of gas from the outside of the metallic mold, reduces quality defect related to trapping of such gas and capable of using from low temperature to high temperature. SOLUTION: A sealing member 5 is located between a metallic mold 100 and an inlet or an outlet side circulation pipe of an oil circulation pipe hole 8 arranged adjacent to a cavity 7 inside the metallic mold. A projection 5A at the front end and a cavity 5C at the rear end of the member 5 are formed and then the projection is inserted into the hole 1B of the metallic mold while graphite seal 10 soaked with liquid graphite is inserted into the cavity 5C of the sealing member, pressed and fixed with a bush 6. The sealing structure of piping in the metallic mold is characterized in that graphite seal is hardened and expanded caused by drying of liquid graphite to seal the outlet or inlet of circulation piping.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for a pipe in a mold.

[0002]

2. Description of the Related Art Conventionally, a method of manufacturing a product by a die casting method is generally a casting method in which a molten metal poured into an injection sleeve is filled into a mold at a high speed. For this reason, during the filling of the molten metal, the gas in the mold is wound into the molten metal, which is one of the causes of deteriorating the product quality.

In order to solve this problem, a gas venting device for discharging gas from a mold has conventionally been used. In this case, in order to prevent gas from entering the outside of the mold, a gas venting device is required. It was necessary to set a seal and completely seal. In particular, as for the sealing of the pipe section, as shown in FIG.

[0004]

However, since the above-mentioned use temperature is high, the temperature-regulated steel pipe also becomes high, and there has been a problem that a commonly used O-ring cannot be used without heat resistance. Further, the steel pipe for general use has a problem that the accuracy is poor due to the state of the outer casting surface, and the O-ring is not completely adhered.

The present invention has solved the above-mentioned problem, and has a simple structure in which gas is sucked from a pipe portion, thereby completely preventing gas from entering from outside the mold. An object of the present invention is to provide a versatile sealing structure for a pipe portion in a mold, which can reduce product quality defects due to entanglement and can be used widely from low to high temperatures.

[0006]

Means for Solving the Problems According to the first aspect of the present invention, there is provided a mold for filling a molten metal into a cavity of a mold, and disposing the mold near a cavity in the mold. One end of the provided oil circulation pipe hole is provided with an input-side circulation pipe outside the mold, and the other end is provided with an output-side circulation pipe, and the input-side or output-side circulation pipe is provided. A protrusion is formed at the front end of the seal member for sealing, and a recess is formed at the rear end. The protrusion is fitted into the groove of the mold, and liquid graphite is immersed in the recess of the seal member. The graphite seal is fitted, the graphite seal is pressed and fixed via a bush, and the liquid seal is dried and the graphite seal is hardened and expanded to seal the output side or input side circulation pipe. It is seal structure of the pipe section in the mold, characterized in.

According to the first aspect of the present invention, since the gas suction of the pipe portion is made simple, it is possible to completely prevent the gas from entering from outside the mold, and the product quality is deteriorated due to the entrainment of the gas. Can be reduced, and can be used widely from low to high temperatures, and a versatile mold sealing structure for a pipe section can be obtained.

According to a second aspect of the present invention, which has been made to solve the above technical problem, the pressing and fixing of the graphite seal is a pressing and fixing by screwing a seal member and a bush. It is a seal structure of a piping part in a metal mold.

According to the second aspect of the invention, in addition to the effect of the first aspect, it is possible to securely fix the seal member and the bush with a simple structure, and to obtain an effect that the sealing is reliably performed.

In order to solve the above-mentioned technical problem, the invention of claim 3 is characterized in that the graphite seal is a ceramic fiber obtained by melting and fibrillating alumina and silicate materials, and after forming into a blanket shape. 2. The seal structure for a piping part in a mold according to claim 1, wherein the graphite seal is made of a material obtained by infiltrating a graphite paste into a graphite paste.

According to the third aspect of the present invention, in addition to the effect of the first aspect, there is obtained an effect that the general-use heat-resistant material is easy to handle and has good pipe integrity.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a mold frame and a core, a circulation pipe and a mold as viewed from a mold mating surface when viewed from a plane direction. FIG. 2 is a sectional view of the vicinity of the seal of the circulation pipe of the present invention.

In FIG. 1, a core 2 is fitted by a spigot into a metal frame 1 of a casting mold 100 for filling a molten metal into a cavity of the casting mold. A cavity 7 having a desired product shape is formed in the core 2, and an oil circulation pipe hole 8 for circulating hot oil at a high temperature for heating the product in the cavity 7 of the product is formed. Cavity 7
It is arranged near.

One end of the oil circulation pipe hole 8 is provided with the input-side circulation pipe 3 outside the casting mold, and the other end is provided with the output-side circulation pipe 4.

A projection 5A is formed at the tip of a seal member 5 for sealing the input side circulation pipe 3 or the output side circulation pipe 4, and a recess is formed at the rear end. The protrusion 5A is fitted into the groove 9 of the metal frame 1 of the casting mold 100.

Further, a graphite seal 10 in which liquid graphite is infiltrated is fitted into the concave portion 5C of the seal member 5, and the graphite seal 10 is pressed and fixed from the rear through a flange-shaped bush 6.

The graphite seal 10 is cured and expanded by drying the liquid graphite, whereby the output side circulation pipe 3 or the input side circulation pipe 4 is sealed.

The oil circulation pipe hole 8 is provided in the side surface 2 of the core 2.
A, via the input circulation pipe 3 and the relief hole 9 of the metal frame 1, the protrusion 3 A of the input circulation pipe 3 is connected to the female screw 2 of the core 2.
B is screwed and fixed to B. The output circulation pipe 4 has a similar structure.

Input circulation pipe 3 and output circulation pipe 4
A relief hole 9 larger than the outer diameter is provided. This relief hole is formed to screw the input and output circulation pipes 3 and 4 directly into the core 2 to prevent oil leakage. ing.

The present invention completely prevents the gas from being sucked from the gap between the input circulation pipe 3, the output circulation pipe 4, and the escape hole 9.

The graphite seal immersed in the liquid graphite is a fine flex blanket T / # 5120
(Product name). The graphite seal is finely cut by hand, sandwiched between tweezers or the like, and immersed in graphite paste 4723-LD, which is a liquid graphite, and Lumisal LD (trade name). All the above products are manufactured by Nichias Corporation.

Also, Fine Flex Blanket T
/ # 5120 is a white ceramic fiber (super heat-resistant inorganic fiber) obtained by electro-melting high-purity alumina and silicate materials, and formed into a blanket (blanket) shape. Lightweight without any binder And flexible.

As described above, the liquid graphite sealed by the screw-sealed graphite seal 10 having high heat resistance hardens the seal member 6 (graphite seal) by heat (about 250 ° C.) and natural drying, and expands. By doing so, it tightly adheres to the input circulation pipe 3 and the output circulation pipe.

The above-mentioned material is a commonly used heat-resistant material, and has effects such as easy handling and good pipe integrity.

In the prior art, the operating temperature is so high that it cannot withstand a general-use sealing material, and the sealing material of the present invention can withstand extremely high temperatures (900 ° C.). Although the present invention has been described with reference to a casting mold, the present invention may be applied to a normal mold, and the present invention may be applied to seals of all pipes such as other water-cooled pipes.

[0026]

As described above, the mold for filling the cavity of the mold with the molten metal, and one end of the oil circulation pipe hole arranged near the cavity in the mold are outside the mold. An input-side circulation pipe is disposed at the other end, and an output-side circulation pipe is disposed at the other end, and a projection is formed at a front end of a seal member that seals the input-side or output-side circulation pipe, and a rear end is formed. A concave portion is formed in the mold, the projecting portion is fitted in the groove of the mold, and a graphite seal in which liquid graphite is infiltrated is fitted in the concave portion of the seal member. The graphite seal is hardened by drying the liquid graphite, and the output side or the input side circulation pipe is sealed by being expanded by sealing the liquid graphite. Therefore, by adopting a simple structure for sucking gas from the piping, it is possible to completely prevent gas from entering from outside the mold, reduce product quality defects due to the entrapment of the gas, and further reduce the temperature. It can be used widely up to high temperatures, and a versatile mold sealing structure for the piping can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a metal frame, a core, and a circulation pipe according to the present invention as viewed from a mold mating surface.

FIG. 2 is a partial cross-sectional view of the input circulation pipe of the present invention.

FIG. 3 is a sectional view of parts of a conventional sealing structure.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 mold 1 mold frame 1B groove 2 core 3 input-side circulation pipe 4 output-side circulation pipe 5 seal member 5A projecting part 5C recess 6 bush 7 cavity 8 oil circulation Piping hole 10: Graphite seal

Claims (3)

[Claims] A mold for filling a molten metal into a cavity of a mold, and one end of an oil circulation pipe hole provided near a cavity in the mold is connected to an input side circulation pipe outside the mold. Is arranged, and the other end is provided with an output side circulation pipe,
A protrusion is formed at the tip of the seal member that seals the input-side or output-side circulation pipe, and a recess is formed at the rear end. The protrusion is fitted into the groove of the mold, and The concave portion is fitted with a graphite seal in which liquid graphite is infiltrated, the graphite seal is pressed and fixed via a bush, and the liquid seal is dried to cure and expand the graphite seal. A sealing structure for a pipe portion in a mold, wherein an input side circulation pipe is sealed. 2. The sealing structure for a pipe part in a mold according to claim 1, wherein the pressing and fixing of the graphite seal is a pressing and fixing by screwing a seal member and a bush. 3. The graphite seal is a ceramic fiber obtained by fusing and fibrous alumina and siliceous materials, and is formed from a material obtained by forming the graphite seal into a blanket shape and then immersing the graphite seal into a graphite paste. The seal structure for a pipe part in a mold according to claim 1, wherein