Mold surface repairing process

Patent metadata

Field	Value
Publication number	US-10906138-B2
Application number	US-201916257192-A
Country	US
Kind code	B2
Filing date	Jan 25, 2019
Priority date	Jul 3, 2018
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

A mold surface repairing process, the process flow of which is as follows: first sand blasting—defect identification—repairing welding—coarse grinding—semi-finishing grinding—finishing grinding—secondary sand blasting—mold heating—spray paint. The disclosure provides a combination of automatic equipment, special grinding tools and finishing grinding process, which ensures the quality and efficiency of the mold repair and reduces the labor force.

First claim

The invention claimed is:

1. A method for repairing a mold surface of a mold, wherein the method successively comprises: a first sand blasting step, a defect identification step, a repairing welding step, a first grinding step, a second grinding step, a third grinding step, a second sand blasting step, and a spray paint step;
during the first sand blasting step, a part of the mold that needs to be repaired is continuously impacted with steel sand inside a sandblasting machine, so that coatings and aluminum on a surface of a mold cavity are removed, and a diffuse reflection surface is formed on the surface of the mold cavity;
during the defect identification step, the surface of the mold cavity is polished overall with sandpaper, so that human eyes can identify a defective area of the mold cavity having defects of corrosion points, depressions, protrusions or cracks, according to a brightness of each area of the surface of the mold cavity;
during the repairing welding step, the defective area of the mold cavity having the defects is filled with argon arc welding;
during the first grinding step, the surface of the mold cavity is shaped and polished with a grinder provided with a brown corundum grinding wheel;
during the second grinding step, the surface of the mold cavity is polished and grinded with a grinder provided with a rubber polishing head;
during the third grinding step, the surface of the mold cavity is grinded with an oilstone to meet appearance requirements, wherein the third grinding step is carried out with a mold grinding tool which uses the oilstone sandwiched by a reciprocating pneumatic file, and the surface of the mold cavity is grinded by a cross grinding process to prevent an occurrence of strip defects or bump defects; and
during the second sand blasting step, a sand blasting operation is carried out before the spray paint step to increase a surface adhesion of the surface of the mold cavity.

Assignees

• Citic Dicastal Co Ltd

Inventors

• Xu Zuo
• Zou Shixiang
• Yang Wenqi
• Zhang Zhiliang
• Wang Hongkun
• Ma Huanming

Classifications

• B24C1/086 Primary

  Descaling; Removing coating films · CPC title

• B22C9/06

  Permanent moulds for shaped castings (moulds for ingots B22D7/06) · CPC title

• B24B19/26

  for grinding workpieces with arcuate surfaces, e.g. parts of car bodies, bumpers or magnetic recording heads (grinding of spherical surfaces in general B24B11/00, of optical surfaces on lenses or surfaces of similar shape on other work B24B13/00) · CPC title

• B29C33/74

  Repairing · CPC title

• B22C9/18

  Finishing · CPC title