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Heat-resisting steel connecting pipe shell investment casting process

A technology for investment casting and connecting pipes, applied in the field of investment casting, can solve the problems of unsatisfactory casting quality, inclusions, cold isolation, etc., and achieve the effects of good economic benefits, good quality and lower production costs

Inactive Publication Date: 2020-09-01
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems that inclusions and cold shuts are easy to appear in the production process of the existing connecting pipe castings, and the quality of the produced castings is not ideal, and a heat-resistant steel connecting pipe shell investment casting process is proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A heat-resistant steel connecting pipe shell investment casting process proposed by the present invention comprises the following steps:

[0026] S1. Wax mold making: select semi-solid paraffin as the wax mold material, use a wax injection machine to inject semi-solid paraffin into the wax mold, and then form a wax mold. The injection pressure is 15kg / cm 2 , The temperature is 58 ℃, using a manual method, using a flat-head electric soldering iron to heat the wax mold piece by piece, welding and gluing to assemble the wax mold;

[0027] S2. Preparation of mold shell: use silica sol as adhesive, add zirconium powder filler, anti-cracking agent, wetting agent, defoamer, stir for 8 hours to prepare slurry, and immerse the wax mold prepared in step S1 into the slurry Slurry is carried out in the material, and then zircon refractory material is sprinkled to form a shell. After the shell is hardened, a layer of hardened shell is coated on the wax mold, and four layers of harde...

Embodiment 2

[0038] A heat-resistant steel connecting pipe shell investment casting process proposed by the present invention comprises the following steps:

[0039] S1. Wax mold making: select semi-solid paraffin as the wax mold material, use a wax injection machine to inject semi-solid paraffin into the wax mold, and then form a wax mold. The injection pressure is 15kg / cm 2 , The temperature is 60 ℃, using a manual method, using a flat-head electric soldering iron to heat the wax mold piece by piece, welding and gluing to assemble the wax mold;

[0040] S2. Preparation of mold shell: use silica sol as adhesive, add zirconium powder filler, anti-cracking agent, wetting agent, defoamer, stir for 9 hours to prepare slurry, and immerse the wax mold prepared in step S1 into the slurry Slurry is carried out in the material, and then zircon refractory material is sprinkled to form a shell. After the shell is hardened, a layer of hardened shell is coated on the wax mold, and four layers of hardene...

Embodiment 3

[0051] A heat-resistant steel connecting pipe shell investment casting process proposed by the present invention comprises the following steps:

[0052] S1. Wax mold making: select semi-solid paraffin as the wax mold material, use a wax injection machine to inject semi-solid paraffin into the wax mold, and then form a wax mold. The injection pressure is 15kg / cm 2 , The temperature is 62 ℃, using a manual method, using a flat-head electric soldering iron to heat the wax mold piece by piece, welding and gluing to assemble the wax mold;

[0053] S2. Preparation of mold shell: use silica sol as adhesive, add zirconium powder filler, anti-cracking agent, wetting agent, defoamer, stir for 10 hours to prepare slurry, and immerse the wax mold prepared in step S1 into the slurry Slurry is carried out in the material, and then zircon refractory material is sprinkled to form a shell. After the shell is hardened, a layer of hardened shell is coated on the wax mold, and four layers of hard...

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PUM

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Abstract

The invention discloses a heat-resisting steel connecting pipe shell investment casting process. The process comprises the following steps that S1, paraffin is subjected to injection forming, a paraffin pattern is obtained, and an electric soldering iron is subjected to welding sticking to assemble a paraffin mold; S2, silica sol serves as a bonding agent, zirconium powder filler, a cracking-prevention agent, a wetting agent, and a defoaming agent are doped, slurry is made, the paraffin mold is immersed in the slurry to subjected to slurry loading, zircon refractory is removed, a mold shell isformed, after hardening, repeated operation is carried out for four times, and a mold shell is obtained; S3, the mold shell is placed in a paraffin removal furnace, steam is led in until the paraffincompletely flows out, the mold shell is placed in a modeling machine to be subjected to sand filling, roasting is carried out, and a high-strength mold shell is obtained; S4, a heat-resisting steel connecting pipe raw material is put into a smelting furnace to be subjected to heat preservation, and molten metal is obtained; S5, component detection is carried out; S6, pouring is carried out; S7, heat treatment is carried out; and S8, casting inspection is carried out, and the heat-resisting steel connecting pipe shell investment casting process is finished. According to the investment castingprocess, the high-quality casting can be produced, the casting yield is high, and phenomena of inclusion and cold shut are not prone to happening.

Description

technical field [0001] The invention relates to the technical field of investment casting, in particular to an investment casting process for a heat-resistant steel connecting pipe shell. Background technique [0002] Heat-resistant steel has high strength and chemical stability under high temperature conditions, and is widely used in parts that work under high temperature conditions such as power machinery, boilers, and steam turbines. In addition to high temperature, high strength and high temperature oxidation corrosion resistance, these parts also require sufficient toughness, good machinability and weldability, and certain structural stability according to different uses. Therefore, heat-resistant steel is one of the commonly used materials for castings. However, due to some structural castings, the structure is more complex, and the thin-walled connecting pipe castings have higher quality requirements. If the traditional casting process is used, the produced connecting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D47/02B22C7/02B22C9/24B22C9/04B22C9/12B22C1/02B22C1/18C21D1/26G01N1/36G01N21/31
CPCB22C1/02B22C1/186B22C7/02B22C9/04B22C9/12B22C9/24B22D47/02C21D1/26G01N1/36G01N21/31G01N2001/366
Inventor 董晟全高云鹏王睿仪何子博梁艳峰
Owner XIAN TECHNOLOGICAL UNIV
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