Improve short cylindrical roller bearing the method of supporting rate to try

April 9, 2012

Short cylindrical roller bearing is a kind of rotation with high accuracy, precision bearing radial load primary, mainly used in large precision machine tool spindle and fine rolling equipment supporting role. In recent years, the kinds of bearings large bearings Luozhou affiliate production and processing of department's flagship product, the value of production, representing about a third of the division has become. But after the last of the old production process and processing methods to create an appropriate attitude rate is low (only 60%), leads to profit big waste materials and working hours, the impact on the department for further economic improvement.

A, the selection of the object

Short cylindrical roller bearing is divided into a large single line, four lines to wait a few species, but carefully study the structural features have much in common: straight groove, welding, Protector, etc.. So in making the problem very similar so the optimization of the process, the contents are very similar, so choose the largest annual short cylindrical roller bearings "32 672" model for the representatives of the optimization of the process-structure-experiment, and broaden the experience in other type with processing technology in order to obtain more substantial economic advantage.

Secondly, the manufacture, processing status quo and existing problems

1 "32 672" camp inside is jacket are Gcr15simn steel processing and the larger size range, heat treatment, hardening method for controlling the shrinkage and deformation degree, often cause scare after leading elliptical and no allowance for grinding so internal, coat a grinding groove size.

2, the "32 672" inside jacket bearing groove discouraged because elliptical can even cause, is this unequal power balance process, the mill roll neck at the end of word size is not stable, it is difficult to control in the process of the specified range.

3 "32 672" camp inside jacket groove loops early, as the machine tool causes equipment aging, such as low precision grinding head the stem so that the formation of ground roll of rough edges to the word face, cause at the end after grinding word roll width of tolerance.

4, can not keep up technical coordination. Due to the above causes, "32 672" groove to grind, the impact of the entire record does not qualify the assembly clearance, the distance is, cause the rotation center of the camp of the uncertainty of the center, which is too small or keep large diameter ( device diameter hole center uniform size will be processed correctly), often produce bearing rotation flexibility, reduce and offset uneven phenomenon, which caused "32 672" stock is a supportive percent of the pass, only 60%, also caused Assembly working hours, processing (drilling, welding) work more hours and material of the unnecessary waste.

Third, improving the control measures and Take due to the problems "32 672", the original optimization process improvement process, some technical measures, including:

Prevent a heat treatment deformation amount can not put off, and heat treatment plant positive-contact, with control forming and after heat treatment of shrinkage, provide data and adjusting the amount of groove to leave. This ensures that heat treatment, hardening, grinding machining center to meet provisioning process requirements.

2, to prevent the end, after the loop size is not stable in the original processing technology based on the additional increase in tempering process, so that processing pressure is removed to guarantee the stability of the groove size.

3, by conversion, overhaul machine tool equipment to improve the accuracy of the main shaft rotation control and a groove feed appropriate measures to improve the frictional surface early to avoid the grind a groove.

4 by and work preparation department coordinate in ensuring the production schedule premise, the process structure, the process first by shrinkage within the influence of groove, so that a word is set, roll grinding condition to develop the technical staff calculation and analysis, the corresponding measures (skin owe can be attached, loops, and change the hole diameter center hold), the percentage of the form to ensure a complete sentence.

5, groove end mill tolerance zone pressure to make its size (more) unified in a very small area, mutual difference is small. This ensures that the support of a qualified rate continued to improve, and save a lot of time with distance.

After optimization of the grinding and direct production since, "32 672" short cylindrical roller bearing is a qualified support rate of 60% to 96% and reduces the FanXiuLv, saving time and resources, reduce production costs.