Shell-making method capable of improving sand clearing efficiency of casting

A sand cleaning and efficient technology, applied in the directions of casting molds, casting mold components, manufacturing tools, etc., can solve the problems of difficult cleaning of thick shells, damage to the surface of castings, difficulty in cleaning sand, etc., to reduce labor input and material input. , the effect of easy cleaning

Inactive Publication Date: 2020-04-14
HUZHOU NANFENG MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current technology has the following disadvantages: 1. It is difficult to clean the sand in the later stage of grouting or sand plugging; 2. Even if the grouting or sand plugging process is not used, the thick shell caused by the accumulation of slurry in some cavities is difficult to clean; 3. The surface of the casting is caused by transitional cleaning Injury or acid corrosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A shell-making method for improving the sand cleaning efficiency of castings, comprising the following steps:

[0024] (1) After cleaning the wax model, immerse it completely in the zircon sand slurry, then take it out and evenly sprinkle 100-200 mesh zircon sand on the surface, and dry it naturally at a relative humidity of 50%-60%. -6 hours to form the first layer of shell model;

[0025] (2), immerse the dried first-layer shell model in the zircon sand slurry, then take it out and evenly sprinkle 100-200 mesh zircon sand on its surface, under the relative humidity of 50%-60%, use Breeze is carried out drying treatment 4-6 hours, makes the second layer shell model;

[0026] (3), immerse the dried second-layer shell model in the mullite powder slurry, then take it out and evenly sprinkle 30-60 mesh mullite on its surface, under the relative humidity of 35%-45%, Use strong wind drying treatment for not less than 8 hours to obtain the third-layer shell model, and then ...

Embodiment 2

[0031] A shell-making method for improving the sand cleaning efficiency of castings, comprising the following steps:

[0032] (1) After cleaning the wax model, immerse it completely in the zircon sand slurry, then take it out and evenly sprinkle 100-200 mesh zircon sand on the surface, and dry it naturally at a relative humidity of 50%-60%. -6 hours to form the first layer of shell model;

[0033] (2), immerse the dried first-layer shell model in the zircon sand slurry, then take it out and evenly sprinkle 100-200 mesh zircon sand on its surface, under the relative humidity of 50%-60%, use Breeze is carried out drying treatment 4-6 hours, makes the second layer shell model;

[0034] (3), immerse the dried second-layer shell model in the mullite powder slurry, then take it out and evenly sprinkle 30-60 mesh mullite on its surface, under the relative humidity of 35%-45%, Use strong wind drying treatment for not less than 8 hours to obtain the third-layer shell model, and then ...

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PUM

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Abstract

The invention discloses a shell-making method capable of improving sand clearing efficiency of a casting. The shell-making method is characterized in that each hole of a slot hole or a cavity is plugged by a sealing part after 4-5 layers of shells are guaranteed to be made for a casting with the cavity or the slot hole during shell-making, and a next layer of the shells is continuously made, so that slurry and sand of making the next layer do not enter the cavity and the slot hole; the inner shell of the cavity or the slot hole is relatively thin, so that sands in the cavity or the slot hole are easily cleared at a later period as long as molten steel does not leak, and therefore, acid-soaking and fierce-hitting are not needed. According to the shell-making method disclosed by the invention, materials are saved, and sand plugging or slurry filling does not need to perform in the cavity or the slot hole, so that material investment and manual investment are reduced; and the sealing partfor sealing is adopted to replace a slurry filling process, so that no more mortar is in the cavity or the slot hole, and the cavity or the inner cavity of the slot hole does not need to clear at a later period, and therefore, acid-soaking and fierce-hitting are not needed, and clearing is easier.

Description

technical field [0001] The invention relates to the field of precision casting, in particular to a shell-making method for improving the sand cleaning efficiency of castings. Background technique [0002] As a key part of the precision casting process, the shell-making process has a vital impact on the dimensional accuracy, metallurgical quality and pass rate of the product. Generally, the casing of precision castings with small slot holes adopts the form of grouting or sand plugging to solve problems such as iron inclusion. The current technology has the following disadvantages: 1. It is difficult to clean the sand in the later stage of grouting or sand plugging; 2. Even if the grouting or sand plugging process is not used, the thick shell caused by the accumulation of slurry in some cavities is difficult to clean; 3. The surface of the casting is caused by transitional cleaning Injury or acid corrosion. Contents of the invention [0003] In view of the above problems, ...

Claims

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Application Information

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IPC IPC(8): B22C9/04
CPCB22C9/04
Inventor 黄德海姚建堂谈敏朱海永
Owner HUZHOU NANFENG MACHINERY MFG
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