A pretreatment method for eliminating air bubbles in product structures with deep grooves and corners during shell making

A product structure and pretreatment technology, which is applied in the pretreatment field of eliminating air bubbles in deep grooves and corners in the product structure in the shell making process, and in the pretreatment field of eliminating air bubbles in product corners and deep grooves, achieving excellent permeability performance, Stable chemical properties, good acid and alkali resistance

Active Publication Date: 2021-12-28
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it still can't solve the problem of iron beans in the groove or corner of the product

Method used

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Embodiment 1

[0032] This embodiment provides a pretreatment method for eliminating air bubbles with deep grooves and corners in the product structure in the shell-making process. Taking the specific preparation of threads and side deep grooves in artificial joints as an example, the specific steps are as follows:

[0033] 1) Prepare brushes of two materials, a hard-tip oil painting pen (hard-tip brush) and a soft-tip oil painting pen (soft-tip brush). Prepare a 100ml glass and glass rod. The glass and glass rod should be rinsed with deionized water and dried with oil-free compressed air to ensure that the surface is clean before use.

[0034] 2) Add 1000g of silica sol and 100g of wetting agent (non-ionic surfactant GSK-585) to the glass successively (that is, the mass ratio of the two is 10:1), use a glass rod to stir the silica sol and wet The mixed solution of the agent was stirred at a constant speed to make it evenly mixed.

[0035] 3) Dip the mixed solution in step 2) with a hard-t...

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Abstract

The invention relates to a pretreatment method for eliminating air bubbles with deep grooves and corners in a product structure in a shell making process, comprising the following steps: A. adding silica sol and a wetting agent into a clean container, stirring and mixing to form a mixed solution B. Brush the mixed solution prepared in step A on the surface of the wax part before the shell making, and then blow the surface after the brushing; C, re-paint the surface layer slurry on the surface of the wax part, and then apply the paint to the surface of the wax part. The surface is blown; D. After the blowing, the shell is made. The present invention pre-processes the wax parts before shell making, and uses chemical and physical dual means to ensure that there are no iron beans in the grooves and corners of the poured product, and the success probability is as high as 95%.

Description

technical field [0001] The invention relates to the technical field of artificial joint preparation, in particular to a pretreatment method for eliminating air bubbles at product structures with deep grooves and corners in the shell making process, and in particular to a method for eliminating product corners and bubbles in the artificial joint shell making process. The pretreatment of air bubbles in the deep groove can avoid the formation of iron bean nodules after the product is poured. Background technique [0002] The so-called investment casting is to use easily meltable materials to make the shape of the product we need, coat it with several layers of special refractory material, pour sand, dry and harden to form a whole model, and then put the material in the model Remove to get a hollow shell. In the process of making the shell, the first step of dipping is particularly important. For parts with complex structures, if the operation is not careful during the dipping ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C7/02B22C3/00
CPCB22C7/02B22C3/00
Inventor 李旭王俊
Owner SHANGHAI JIAOTONG UNIV
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