Mold cutting edge repair welding process

Abstract

The invention relates to a mold cutting edge repair welding process. The mold cutting edge repair welding process comprises the following steps: S1, making preparations before welding; S11, drying a welding rod; S12, opening a break; S13, cleaning; S2, preheating: putting a mold into an electric heating furnace, uniformly heating to 250-450 DEG C, and taking the mold out; S3, welding: fixing a mold parent material onto a workbench, and welding by adopting low current gas arc and vertical short arc operation, reverse welding and uniform filling, and jointing during layered staggered welding; S4, heating and preserving heat: putting the welded mold back into the electric heating furnace for heating till the temperature is up to 150-300 DEG C, preserving heat for 25-35 minutes, and the performing furnace cooling; S5, assembling after welding: trimming a welding area, forming a gap, assembling the mold on a machine tool, performing trial production, and detecting a product. The mold cutting edge repair welding process has the advantages of simple machining process, short period, low cost and long service life after repair welding.

Description

technical field [0001] The present invention relates to Cr with better hardenability 12 The repair welding process of MoV die steel, especially the repair welding process of the die edge. Background technique [0002] With the rapid development of the automobile industry, the manufacture and use of various stamping dies are becoming more and more common. As a supporting manufacturer of stamping and welding parts for FAW Toyota and FAW Volkswagen, our company has thousands of sets of dies that are frequently used and maintained every year. Due to the large amount of mold used, the cutting edge of the mold often suffers from gnawing, chipping, and partial cracking. Although in order to reduce maintenance costs, inserts are used to assemble as much as possible during mold design and manufacturing. However, due to the relatively large size of individual inserts, The shape of the toughness is very irregular, and it is limited by the shape and size of the workpiece. If it is dama...

AI Technical Summary

Problems solved by technology

Due to the large amount of mold used, the cutting edge of the mold often suffers from gnawing, chipping, and partial cracking. Although in order to reduce maintenance costs, inserts are used to assemble as much as possible during mold design and manufacturing. However, due to the relatively large size of individual inserts, The shape of the toughness is very irregular, and it is limited by the shape and size of the workpiece. If it is damaged, it needs to be blanked, forged, machined, heat treated, electric A series of technological processes such as sparks and fine grinding, the technological process is complex, the processing cycle is long, and the manufacturing cost is high, which has a great impact on production planning and punctual management