MOLD SURFACE REPAIRING PROCESS

Abstract

A mold surface repairing process, the process flow of which is as follows: first sand blastingdefect identificationrepairing weldingcoarse grindingsemi-finishing grindingfinishing grindingsecondary sand blastingmold heatingspray 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.

Claims

1. A mold surface repairing process, wherein a process flow of the mold surface repairing process is as follows: first sand blastingdefect identificationrepairing weldingcoarse grindingsemi-finishing grindingfinishing grindingsecondary sand blastingmold heatingspray paint; during the first sand blasting, a part of an off-machine mold that need to be repaired is continuously impacted with high-speed fine steel sand inside a sandblasting machine, so that coatings and sticky aluminum on a surface are removed, and a uniform diffuse reflection surface is formed on the surface of a mold cavity; during the defect identification, the surface of the mold cavity is polished overall with sandpaper, so that the human eyes can identify defects, such as corrosion points, depressions, protrusions and cracks, according to the brightness difference of each location; during the repairing welding, in an area with relatively large defects, a defective part is filled with argon arc welding, so that the defective area is slightly higher than a surface size required by the drawings; during the coarse grinding, a damaged surface is quickly shaped and polished with a grinder provided with a brown corundum grinding wheel; during the semi-finishing grinding, the surface of the mold cavity is quickly polished and grinded with a grinder provided with a rubber polishing head; during the finishing grinding, the cavity surface is finely grinded with an oilstone to meet the appearance requirements, wherein the finishing grinding operation can be carried out with a special mold grinding tool which uses the oilstone sandwiched by a reciprocating pneumatic file, and the surface is grinded by a cross grinding process to prevent the occurrence of strip defects or bump defects; during the secondary sand blasting, a sand blasting operation is carried out before the spray paint, so that the surface of the mold cavity is uniform and rough, thereby increasing the surface adhesion thereof.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0016] FIG. 1 is a flow chart of mold cavity surface repairing process.

DETAILED DESCRIPTION

[0017] The present disclosure will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0018] As shown in FIG. 1, a mold surface repairing process is as follows: first sand blastingdefect identificationrepairing weldingcoarse grindingsemi-finishing grindingfinishing grindingsecondary sand blastingmold heatingspray paint.

[0019] During the first sand blasting, the part of the off-machine mold that need to be repaired is continuously impacted with high-speed fine steel sand inside the sandblasting machine, so that the coatings and sticky aluminum on the surface are removed, and a uniform diffuse reflection surface is formed on the surface of the mold cavity.

[0020] During the defect identification, the surface of the mold cavity is polished overall with sandpaper, so that the human eyes can identify defects, such as corrosion points, depressions, protrusions and cracks, according to the brightness difference of each location.

[0021] During the repairing welding, in the area with relatively large defects, the defective part is filled with argon arc welding, so that the defective area is slightly higher than the surface size required by the drawings.

[0022] During the coarse grinding, the damaged surface is quickly shaped and polished with a grinder provided with a brown corundum grinding wheel;

[0023] During the semi-finishing grinding, the cavity surface is quickly polished and grinded with a grinder provided with a rubber polishing head.

[0024] During the finishing grinding, the cavity surface is finely grinded with an oilstone to meet the appearance requirements, wherein the finishing grinding operation can be carried out with a special mold grinding tool which uses the oilstone sandwiched by a reciprocating pneumatic file, and the surface is grinded by the cross grinding process to prevent the occurrence of strip defects or bump defects.

[0025] During the secondary sand blasting, the sand blasting operation is carried out before the spray paint, so that the cavity surface is uniform and rough, thereby increasing the surface adhesion thereof.