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Tool heat treatment process operating skills(1)
2016-02-19
Most of the heat treatment process(cutter wheel) is a periodic job is a collective action.Therefore, heat treatment processing technology, there is no clear boundary work, such as a number of parts quenching may be done by two shifts, quenching and tempering are often completed by two shifts, etc., coupled with the uneven quality of workers, management measures to improve small enough, production process quality problems often occur.And after problems, analyze problems, find out the reasons, not only time-consuming, laborious, and sometimes can not find the real reason.
Here I put some ideas over the years in the production site and methods to solve the problem were summarized to provide some useful reference for readers.
1. carburized gear low hardness
A group in the (Japan) Unicase drip nitriding furnace gas carburizing carburizing more than 800 pieces of gear, the surface hardness after carburizing 58 ~ 63HRC, while sampling surface hardness of parts of 52 ~ 56HRC.This is a problem carburizing, hardening or problem;Quenching heating problem, or cooling issues, and sometimes difficult to conclude.As the production of these gears urgent tasks, the author has detected a gear taking three tied with wire and re-heated in a salt bath furnace, quenching in oil bath, after about 30 ~ 40min, final inspection quenching hardness 63 ~ 65HRC.After the batch of gear reheating quenching, hardness sampling all qualified.This cut the Gordian knot of the way, though not necessarily be able to identify the real cause of the problem, but to solve the urgent needs of the production.
2. bar quenching cracks
There are a number of pension φ14mm × 40Cr quenched material at the rear 240mm buried, after about a week (when used) was discovered almost all the crack, the crack shape single longitudinal crack crack crack through the majority of end faces of the bar. Judge cracks of quenching cracks, and the operator on duty but deny it.Check the job log, can only be found second class batch bar quenching, tempering three shifts, and the process parameters of parts and materials, the quenching temperature and cooling medium, etc. are not recorded.I take a bar with 45 steel joints together in a salt bath furnace heated and then quenching in salt water, cooled to about 20 ~ 30min, the bar cracking, and crack the same shape as the shape of the above-described crack.In the face of the facts, the operator admitted that mistake as a batch of 45 steel bar quenched.
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