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Gate late casting precise casting technology facilitating wax discharge and gas exhaust

A technology of precision casting and castings, which is applied in the field of precision casting of ram castings. It can solve the problems of air suffocation, large pockets and pinholes of ram castings, and difficult discharge of mold shell gas, so as to improve the quality of castings and reduce the effect of air pockets.

Active Publication Date: 2020-01-17
WENZHOU WANHONG VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the process of precision casting of this type of ram castings, there are problems of wax removal and exhaust difficulty. First, part of the wax liquid tends to remain inside the mold shell after dewaxing, which easily leads to gray spots on the surface of the formed ram castings. The second is that the gas inside the mold shell is not easy to discharge during the casting process, which may easily cause gas suffocation, which will lead to atmospheric pockets and pinholes on the surface of the formed gate casting

Method used

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  • Gate late casting precise casting technology facilitating wax discharge and gas exhaust
  • Gate late casting precise casting technology facilitating wax discharge and gas exhaust
  • Gate late casting precise casting technology facilitating wax discharge and gas exhaust

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The specific dimensions of the wax-discharging nail 24 are as follows: the diameter of the cylindrical part 242 is 1.3mm, and the length is 11mm; The cylindrical portion 242 is equal in diameter.

[0038] A gate casting investment casting process that is convenient for wax removal and exhaust, comprising the steps:

[0039] S1 Pressed wax: Inject molten wax liquid into the mold to form a precision wax model 21, then water-cool and wax repair;

[0040] S2 group tree: melt the four precision wax molds 21 and the sprue 22 into one, and then place four wax nails 24 on the top of each precision wax mold 21, and obtain the wax mold group 2 after cleaning;

[0041] S3 shell making:

[0042] The first step is to pre-wet the wax module 2 first, then immerse the wax module 2 in the alkaline silica sol, so that the silica sol evenly covers the surface of the wax module 2, then spray sand, and dry to form the first layer;

[0043] In the second step, repeat the first step sever...

Embodiment 2

[0055] The specific dimensions of the wax-discharging nail 24 are as follows: the diameter of the cylindrical part 242 is 1.5mm, and the length is 9mm; The cylindrical portion 242 is equal in diameter.

[0056] A gate casting investment casting process that is convenient for wax removal and exhaust, comprising the steps:

[0057]S1 Pressed wax: Inject molten wax liquid into the mold to form a precision wax model 21, then water-cool and wax repair;

[0058] S2 group tree: melt the four precision wax molds 21 and the sprue 22 into one, and then place four wax nails 24 on the top of each precision wax mold 21, and obtain the wax mold group 2 after cleaning;

[0059] S3 shell making:

[0060] The first step is to pre-wet the wax module 2 first, then immerse the wax module 2 in the alkaline silica sol, so that the silica sol evenly covers the surface of the wax module 2, then spray sand, and dry to form the first layer;

[0061] In the second step, repeat the first step several...

Embodiment 3

[0073] The specific dimensions of the wax-discharging nail 24 are as follows: the diameter of the cylindrical part 242 is 1.4mm, and the length is 10mm; The shape portion 242 is equal in diameter.

[0074] A gate casting investment casting process that is convenient for wax removal and exhaust, comprising the steps:

[0075] S1 Pressed wax: Inject molten wax liquid into the mold to form a precision wax model 21, then water-cool and wax repair;

[0076] S2 group tree: melt the four precision wax molds 21 and the sprue 22 into one, and then place four wax nails 24 on the top of each precision wax mold 21, and obtain the wax mold group 2 after cleaning;

[0077] S3 shell making:

[0078] The first step is to pre-wet the wax module 2 first, then immerse the wax module 2 in the alkaline silica sol, so that the silica sol evenly covers the surface of the wax module 2, then spray sand, and dry to form the first layer;

[0079] In the second step, repeat the first step several tim...

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Abstract

The invention discloses a gate plate casting precise casting technology facilitating wax discharge and gas exhaust. The technology is technically characterized by comprising the steps of S1, wax pressing, S2, pouring gate assembly, S3, shell manufacturing, S4, dewaxing, S5, roasting, S6, casting, S7, shell removal, S8, cutting, S9, grinding, S10, shot blasting, S11, heat treatment and S12, surfacetreatment. The specific process of the S2 of pouring gate assembly includes the steps that a precise wax mold and a sprue are connected into a whole, and wax discharge nails are arranged on the top of the precision wax mold to obtain a wax mold set; and after the S3 of shelling is finished, heads of the wax discharge nails are cut off, so that a shell is provided with a wax discharge and gas exhaust port. Compared with the mode of arranging a wax discharge strip, the shell is provided with the independent wax discharge and gas exhaust port, steam pressure can make wax liquid completely flow out when during dewaxing, and no wax liquid is left. During pouring, gas in the shell is also exhausted from the wax discharge and gas exhaust port, the pressure intensity is coordinated, then the phenomena of gas pockets, needle holes, slag inclusion and the like on the surface of a gate plate casting are reduced, the quality of the casting is greatly improved, and no pollution is emitted when theshell is roasted.

Description

technical field [0001] The invention relates to the technical field of precision casting, in particular to a gate casting precision casting process which is convenient for wax and exhaust. Background technique [0002] Precision casting is also called lost wax casting. Compared with the traditional sand casting process, the castings obtained by precision casting are more accurate in size and smoother in surface, which is close to the final shape of the part and can be used directly without or with a small amount of processing. Precision casting is divided into investment casting, ceramic casting, metal casting, pressure casting, and lost foam casting. Shelling, cutting, grinding, shot blasting. [0003] At present, many valve bodies and valve cores in the valve industry are manufactured by precision casting technology. The gate parts of gate valves, such as figure 1 As shown, the type of gate casting 1 is a parallel double gate, each of which is provided with a T-shaped gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/22B22C7/02
CPCB22C7/02B22C9/043B22C9/22
Inventor 季奇章季豪敏
Owner WENZHOU WANHONG VALVE
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