Method for removing defect of casting surface with spherical sand by sandblasting

A technology of spherical sand and sandblasting, which is applied to chemical instruments and methods, and other chemical processes, etc. It can solve the problems of operators who are prone to occupational diseases, dusty production environment, and misjudgment of casting product quality, so as to reduce fluorescence repair. rate, low magnetic substance content, and the effect of reducing abrasive wear

Active Publication Date: 2011-03-16
HARBIN XINRUN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are two traditional sandblasting methods, one uses river sand as the abrasive for sandblasting, and the other uses corundum sand as the abrasive for sandblasting. The two abrasives are easy to pulverize and the production efficiency is not high. The production environment is dusty, the operators are prone to occupational diseases, and it is easy to introduce the illusion of unsuitable fluorescence inspection, which greatly increases the possibility of misjudgment in the judgment of casting product quality, especially for precision castings with high requirements. The secondary and multiple costs of casting repair and inspection are greatly increased
[0003] Sand blasting with river sand cannot completely remove the microscopic residual shell attached to the surface of the casting, so that the penetrating liquid invades into the residu

Method used

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  • Method for removing defect of casting surface with spherical sand by sandblasting
  • Method for removing defect of casting surface with spherical sand by sandblasting
  • Method for removing defect of casting surface with spherical sand by sandblasting

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Embodiment 1

[0029] The method of removing surface defects of castings by sand blasting with spherical sand, the first step: select spherical sand, the spherical sand particles are required to be hard, the spherical shape is round, and the chemical content meets the sandblasting requirements. The sand material particle size is preferably 16-30 mesh. Adding 5-15% of the weight of the spherical sand to the spherical sand is non-spherical and angular natural irregular-shaped sand material as a cutting abrasive; the second step: drying the spherical sand to make the water content <2% ;The third step: remove the soil and other impurities in the spherical sand; the fourth step: choose the sandblasting pressure according to the size and thickness of the casting, the pressure is controlled at 0.55-0.6MPa, put the spherical sand into the sandblasting bucket, and the air compressor The manufactured compressed air sucks the sand into the sandblasting pipeline, and blasts through the secondary air-inta...

Embodiment 2

[0034] According to the method for removing surface defects of castings by blasting the spherical sand described in Example 1, the content of the described spherical sand is required to be 70-80% of aluminum oxide, 10-20% of silicon oxide, iron oxide<5%, titanium oxide <5%; the preparation method of the described spherical sand is to calcinate the bauxite ore at 1000~1400 degrees centigrade for 1~2 hours; Balls are sprayed in a molten state; the sprayed balls are sieved, and particles of 0.1 to 2.9 mm are taken to obtain remelted aluminum spherical sandblasting products.

Embodiment 3

[0036] According to the spherical sand described in embodiment 1 or 2, the method for sandblasting to remove fluorescent defects on the casting surface, corundum sand is compared with spherical sand,

[0037] 1) Anti-powdering ability: corundum sand will pulverize at 30MPa, and spherical sand will pulverize at 50MPa.

[0038] 2) The degree of pulverization has a great relationship with the injection pressure. Normally (at a pressure of 0.65Mp), the pulverization of spherical sand is 3-4 times smaller than that of corundum.

[0039] attached figure 2 The bright spots in the medium and large ones are caused by excessive phosphor powder, not the defects of spherical sand blasting.

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Abstract

The invention discloses a method for removing defect of casting surface with spherical sand by sandblasting. Sandblasting is performed by using emergy as an abrasive in a conventional sandblasting method. Two abrasives used in the conventional method are easy to pulverize, so the production efficiency is low. The method of the invention comprises: a first step: selecting the spherical sand, wherein the particles of the spherical sand are required to be hard and round, chemical contents meet the sandblasting requirement, the sand aggregate has the advisable particle size of 16-30 meshes; and 5-15% by weight of irregular shaped sand aggregate is added to the spherical sand and used as a cutting abrasive; a second step: drying the spherical sand to less than 2% of water content; a third step: removing soil and other impurities in the spherical sand; a fourth step: selecting a sandblasting pressure according to the casting size and thickness, controlling the pressure at 0.55-0.6 MPa, packing the spherical sand into a sandblasting bucket, sucking the sand into a sandblasting pipe by compressed air generated by an air compressor, sandblasting the surface through a secondary inlet type gun head, then subjecting the casting to fluorescence detection after sandblasting. The method is used for sandblasting.

Description

Technical field: [0001] The invention relates to a sand blasting method in the foundry industry, in particular to a method for removing surface defects of castings by blasting spherical sand. Background technique: [0002] There are two traditional sandblasting methods, one uses river sand as the abrasive for sandblasting, and the other uses corundum sand as the abrasive for sandblasting. The two abrasives are easy to pulverize and the production efficiency is not high. The production environment is dusty, the operators are prone to occupational diseases, and it is easy to introduce the illusion of unsuitable fluorescence inspection, which greatly increases the possibility of misjudgment in the judgment of casting product quality, especially for precision castings with high requirements. The secondary and multiple costs of casting repair and inspection are greatly improved. [0003] River sand blasting cannot completely remove the microscopic residual shell attached to the ...

Claims

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Application Information

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IPC IPC(8): C09K3/14B24C1/08C04B35/10C04B35/653
Inventor 高亚龙常连华王磊
Owner HARBIN XINRUN IND
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