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Investment casting production technology of valve casting, and valve casting

A technology of investment casting and production process, applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of thin-walled structure of castings, and achieve the effect of good surface finish, good internal quality, and increased solidification time

Inactive Publication Date: 2019-05-21
大成(常熟)机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a production process of investment casting of valve castings and valve castings, and solve the problem that the middle cylinder of the valve castings and the flanges on both sides are not connected in the prior art so that the castings There is a problem of thin-walled structure in the middle, and a valve casting with process ribs added between the middle cylinder and the flange is provided

Method used

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  • Investment casting production technology of valve casting, and valve casting
  • Investment casting production technology of valve casting, and valve casting
  • Investment casting production technology of valve casting, and valve casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A production process of investment casting of valve castings, comprising the steps of:

[0030] Step 1. Wax mold process: put the wax into the wax injection machine, and inject the wax in the wax injection machine to form a wax piece. The pressure of the wax injection is 20kg / cm 2 , the temperature of the wax injection process workshop is 22°C, and the wax pieces are cooled and then blown dry. After the surface of the wax tree is qualified, the wax model is ready for use;

[0031] Step 2. Shell making process: use the silica sol shell making process to make a shell on the wax model in step 1 by dipping slurry, sticking sand and drying cycle. The drying temperature is 80°C and the drying time is 6 hours. Keep the inner cavity dry during the shell making process, and there is no accumulation in the cavity when coating and hanging. After the shell making is completed, drill holes. Dewaxing is carried out in the middle, and the vapor pressure of dewaxing is 8.0kg / cm 2 Af...

Embodiment 2

[0038] A production process of investment casting of valve castings, comprising the steps of:

[0039] Step 1. Wax mold process: put the wax into the wax injection machine, and inject the wax in the wax injection machine to form a wax piece. The pressure of the wax injection is 20kg / cm 2 , the temperature of the wax injection process workshop is 28°C, the wax pieces are cooled and then blown dry, the cooling medium of the wax pieces is water, the cooling temperature is 30°C, and the cooling time is 50min, then the wax is repaired, and the tree is assembled and inspected after passing the inspection After the surface of the wax tree is qualified, the wax model is ready for use;

[0040] Step 2. Shell making process: use the silica sol shell making process to make a shell on the wax model in step 1 by dipping slurry, sticking sand and drying cycle. The drying temperature is 100 °C and the drying time is 4 hours. Keep the inner cavity dry during the shell making process, and the...

Embodiment 3

[0047] A production process of investment casting of valve castings, comprising the steps of:

[0048] Step 1. Wax mold process: put the wax into the wax injection machine, and inject the wax in the wax injection machine to form a wax piece. The pressure of the wax injection is 20kg / cm 2 , the temperature of the wax injection process workshop is 25°C, the wax pieces are cooled and then blown dry, the cooling medium of the wax pieces is water, the cooling temperature is 25°C, and the cooling time is 60min, then the wax is repaired, and the tree is assembled and inspected after passing the inspection After the surface of the wax tree is qualified, the wax model is ready for use;

[0049] Step 2. Shell making process: use the silica sol shell making process to make a shell on the wax model in step 1 by dipping slurry, sticking sand and drying cycle. The drying temperature is 90 ° C and the drying time is 5 hours. Keep the inner cavity dry during the shell making process, and the...

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Abstract

The invention relates to the technical field of investment casting technologies, in particular to an investment casting production technology of a valve casting, and the valve casting. The investmentcasting production technology of the valve casting comprises the working procedures of wax pattern making; shell making, wherein a silica sol shell making technology is used for making a shell on a wax pattern by circularly dipping the wax pattern into slurry, and carrying out sand burning and drying, carrying out drilling after shell making is completed, and carrying out dewaxing then; smelting,wherein placing the shell into a shell burning furnace for roasting, and in the roasting process, a sprue cup is placed downwards to pouring molten steel to form the casting; and after treatment. Thevalve casting is made by adopting the investment casting production technology, process ribs are arranged at the position of combination between an intermediate column of the valve casting and a flange plate. With the investment casting production technology of the valve casting, the problem that in the prior art, because of the structure that an intermediate column and flange plates on the two sides in a valve casting are not connected, a thin-wall structure exists in the middle of the casting is solved, and the provided valve casting is good in quality, low in defect rate and good in smoothfinish.

Description

technical field [0001] The invention relates to the technical field of investment casting technology, in particular to a production process of investment casting of valve castings and the valve castings. Background technique [0002] Investment casting process of valve castings: wax injection, wax repair, wax inspection, tree formation, tree hanging, shell making, dewaxing, roasting, pouring, shell vibration, shot blasting, cutting, grinding, first inspection, welding repair, Heat treatment, shot blasting, pickling and final inspection. [0003] Such as figure 1 and figure 2 As shown in the valve casting, the middle cylinder of the valve body and the flanges on both sides of the valve casting are not connected, and there are gaps. This position is not easy to dry when making the shell. It is often found that molten steel leaks after pouring, which makes it difficult to clean up later, which is very wasteful. artificial. The unconnected structure of the middle cylinder a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C7/02B22C9/04B22C9/22B22C3/00
Inventor 杨健韩建强杨明富高博刚
Owner 大成(常熟)机械有限公司
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