Casing Centralizer,Carbon Fiber,Drilling Centralizer,Bow Spring Casing Centralizer PUYANG RENHE INDUSTRY CO.,LTD , https://www.renhedownholetool.com
There are many ways to improve the quality of gear tooth surface machining, and hard tooth surface scraping technology is one of them. Compared with the grinding teeth, it has the characteristics of no special equipment and high processing efficiency under the premise of satisfying the processing quality. Gear transmission is the main form of mechanical transmission, with traditional high efficiency, large transmission torque, high transmission ratio and adapt to various transmission conditions, so it is widely used. One type of gear we often produce has a precision grade of 9-8-8 and a tooth surface finish of 312. The past tooth making process is: blanking) blanking) toothing) carburizing and quenching) assembly. According to the process, Zibo BMW knows that carburizing and quenching is the last process of gear processing, which inevitably leads to the increase of the common normal line and the deformation of the tooth profile due to heat treatment, and thus the gear assembly clearance is difficult to control, affecting the normal meshing of the gear. And transmission. Furthermore, after heat treatment, the gear accuracy grade is generally reduced by 115 grades and 2 grades, which greatly affects the working accuracy and transmission accuracy of the gears. In practice, we have also tried to process the gear common normal to near-lower deviation before heat treatment, but still can not completely eliminate the increase and deformation caused by heat treatment, and the accuracy is reduced.
Since the heat treatment deformation process is a process that cannot be completely controlled by humans, this method cannot meet the requirements of gear processing. This requires us to adopt a more effective process to ensure the accuracy of gear processing without the gear grinding machine. The process of hardened surface scraping of gears is: blanking) blanking) hobbing) heat treatment) scraping. The equipment used for scraping is the Y31125E gear hobbing machine. Of course, scraping can also be carried out in other gear processing equipment. The equipment used for scraping generally requires good rigidity so as not to affect the processing quality and prevent damage to the equipment. Selection of scraping tools: Scraping generally uses carbide hobs, and the hobs are divided into 0b and -30b. The hardness of the gear surface of our gear is generally HRC5660. In combination with this technology, we have selected the -30b carbide hob made by Penglai Tools Factory. This hob is suitable for machining hardened gears. The hard tooth surface scraping allowance must be appropriate. The margin is too large, it needs multiple scraping to complete, affecting efficiency, and the scraping margin is too small to make the hob dull. According to our experience, when the remaining amount is 40Lm, the dust removal equipment in Zhejiang can be scraped once. When the balance is more than 40Lm, it must be scraped twice. Our process stipulates that the scraping allowance is 30Lm40Lm. Generally, there is no cooling (referring to liquid cooling) during scraping. This is because the blade temperature is high during scraping, and it is easy to cause a knife (cracking) if the cooling is not uniform or the cooling is not timely.