The Research Of The Technology Of Laser’s Repairation Based On Hot Forging Die For Bevel Gear

This paper is mainly on the laser cladding technology of hot forging die with bevel gear.The sample of bevel gear is from bevel gears hot forging production line in Xingcheng powder metallurgy co., LTD., and the laser repairation system is from the mechanical engineering and automation laser processing lab in Liaoning University of Technology School. The High-performance laser repairation to the scrapped mould of this company not only saves resources, but brings a certain economic benefits.Before the research starts, it is necessary to make full investigation, so the subject needs half a year of on-the-spot investigation, observation on the mould’s actual production conditions to the factory, and the mold processing, heat treatment, usage, scrapping and all process are found, and research record of the various factors was made and mainly focused on and analyzed the usage of mould. Then it was found that when the mould was in use, the environment was very bad, the mould needed to work on the forging press reciprocatingly,but such work environment needs the mould with the high anti-fatigue performance, which is the main reason for the mold’s scrapping; secondly, the mold needed to forge the blank after heating, the heat conducted to the mold, after finishing a part, and then washed it with lubricant, but in contact with the liquid at the same time also will make the mould cool rapidly,so in the process of reciprocating temperature cool, it will increase the fatigue of the mold;thirdly, when the mold forges products, the mold suffers from wear and tear, which is the main reason for the mold’s scrapping. Because at the same time when blank is not fully into liquid, blank is forced to flow from the surface of the mold, which makes the most serious wear and tear on the sharp part. This is the most necessary in mold’s repairation process.The next stage to talk about is the link of mold’s repairation. The main part of this paper is aimed at research about laser repairation layer of H13 steel, because when doing the traditional laser repairation, it was found that the traditional repairation failed to achieve a good effect, and exposed many problems that can be solved. The gradient iron based alloy cladding layer has been explored through the experiment: the cladding layer is divided into three layers, through the way of interlaced overlay cladding showed from the bottom to the top floor and micro-hardness value rising trend, such a structure is a good way to avoid the traditional repairation in the shortage of the cladding layer’s collapsing at work, and all use iron based alloy powder, and the combination of cladding layer and substrate performance is very good.Then the specific application of the gradient iron based alloy cladding layer is illustrated,which is also the ultimate goal of this study. Namely, on the scrapping hot forging die with bevel gear laser repairation is conducted, the scrapping area is fixed, which makes it regain the production capacity. The requirement of repairation is not only restoring the original standard shape, and more importantly performance will achieve even more than the originalperformance. After laser’s repairation, the mould finally preprocesses pretreatment before production and then can be involved in the production again. The pretreatment is processing out the working face according to the production standard on the mould’s surface mainly by the way of mechanical processing, the last is involved into the production. Here a standard of measure is to participate in repairation of bevel gear after hot forging die production, by comparing the quantity of production to measure the effect of the experiment.Finally the practical application of the gradient iron based alloy cladding layer outdistanced e the production capacity of new mould, which shows that the scheme to repairation bevel gear with hot forging die is more feasible, and the gradient structure of cladding layer significantly avoids the faults the cladding layer collapse burst when receiving the outside load. Finally, the scheme becomes more economic and reliable.