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Precision casting process for eliminating defects of deep hole casting shell

A precision casting and deep hole technology, applied in the field of casting processing, can solve the problems of insufficient casting, long drying time, and high casting cost, and achieve the effects of improving product yield, shortening drying time, and simplifying the process

Pending Publication Date: 2021-07-02
STRONG H MACHINERY TECH
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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 provide a precision casting process that eliminates the defects of deep-hole casting shells, and solve the problems of insufficient casting, long drying time, iron plugging in the holes and serious shrinkage cavities in the existing investment casting. , the problem of high casting cost

Method used

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  • Precision casting process for eliminating defects of deep hole casting shell

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Comparison scheme
Effect test

Embodiment 1

[0032] see figure 1 Shown, the present invention is a kind of precision casting technology that eliminates deep hole casting shell defect, comprises the following steps:

[0033] Step 1: Select the wax mold used for casting the shell. The middle of the wax mold is hollow, and there are several deep holes on the peripheral side of the wax mold;

[0034] Step 2: Wash the wax model in the cleaning agent for 15S, remove the dust and impurities on the surface, and dry it quickly;

[0035] Step 3: Evenly coat the surface of the wax pattern with zirconium slurry made of 325-mesh zirconium powder with a viscosity of 40mPa.s, then evenly spray 80-120-mesh zirconium sand, and then dry it to form a surface shell and dry it in the air The temperature is 24 degrees Celsius;

[0036] Step 4: Evenly coat zirconium slurry with a viscosity of 20-22mPa.s made of 325-mesh zirconium powder on the surface of the shell zircon sand, then evenly spray 80-120-mesh mullite, and then dry to form the f...

Embodiment 2

[0050]The present invention is a precision casting process for eliminating the defects of deep-hole cast shells, and its comparison with the traditional process is shown in the following table:

[0051] wax model Deep hole sand core Machining influences Process of the present invention hollow wax model Zircon sand core Reaming and deburring the blank After the sand core is used, the deep hole is easy to cool, reducing the occurrence of air bubbles, high yield and high machining efficiency Existing process solid wax model No core Punching and deburring the blank Insufficient casting is prone to occur in deep holes, the yield rate is not high, and machining takes relatively more time

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Abstract

The invention discloses a precision casting process for eliminating defects of a deep hole casting shell, and relates to the technical field of casting machining. A deep hole is filled with a refractory zircon sand material in the shell manufacturing process, and zircon sand is filled and plugged in the sand filling process in a mode of shaking the shell by hand, so that a hole core forms a firm sand core. Compared with a traditional process, the zircon sand core is used, the situation that bubbles are generated due to uneven molten metal casting in the deep hole is avoided, the product yield is improved; the deep hole is filled with zircon sand, so that the airing problem of the deep hole does not need to be considered during airing, the airing time is shortened, and the working efficiency is improved; by using a hollow wax mold, the zircon sand can be directly poured into a wax mold from an opening of the wax mold when the sand core with the deep hole is manufactured, and then the deep hole is filled with the zircon sand by shaking the mold shell, so that the manufacturing efficiency of the sand core is improved; and the step of hardening a shell is omitted after the shell is manufactured, so that the process is simplified, and the production efficiency is further improved.

Description

technical field [0001] The invention belongs to the technical field of casting processing, and in particular relates to a precision casting process for eliminating defects of deep-hole casting shells. Background technique [0002] Investment casting, also known as lost wax casting, includes processes such as wax pressing, wax repairing, tree formation, dipping, melting wax, casting molten metal and post-processing. Lost wax casting is to use wax to make a wax mold of the part to be cast, and then coat the wax mold with slurry to obtain a shell. After the mold shell is dried, put it into hot water to melt the internal wax pattern, take out the mold shell that has melted the wax pattern, and then pour molten metal from the sprue, and after cooling, the required parts are made after shaking the shell. . [0003] However, when investment casting is carried out in deep hole casting, it is easy to cast insufficiently, the drying time is long, the problem of iron plugging in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C1/00B22C9/10
CPCB22C9/04B22C1/00B22C9/10
Inventor 孟显强
Owner STRONG H MACHINERY TECH