Universal elevator axis processing technique

Abstract

It relates to the processing of electric lift that comprises the normalizing rough turning, fine turning, milling slot, calibration, fine grinding shaft radius, featuring in the rough turning before the fine one, with the processing of the small tapering hole C processing with the A and B end central hole, with pass rate reaching over 98%.

Description

technical field [0001] The invention relates to a general elevator shaft processing technology, which guides and regulates the elevator shaft processing, and belongs to the technical field of general elevator shaft processing technology. Background technique [0002] The general elevator shaft is a key component in the commercial elevators of OTIS series products, which undertakes the bearing and up and down movement functions of the entire elevator bridge box. The processing quality of the elevator shaft is directly related to the safety performance of the product. For the processing of general shaft parts, typical The processing technology is as follows: the center hole is used as the positioning reference. In mass production, the center hole of the end face is processed on a special machine tool. However, there is a small tapered hole (at C) in the center hole of one end of the elevator shaft, and there are positional requirements for each other, so the end surface and th...

AI Technical Summary

Problems solved by technology

[0003] As shown in Figures 1 and 2, the elevator shaft is currently subjected to normalizing treatment without rough machining to remove the blank allowance before the heat treatment. After the parts are finished and milled, the entire shaft will be severely bent. The diameter is relatively thick, and the heat treatment normalizing cooling rate is not enough, resulting in uneven internal structure of the material. At the same time, the rough turning allowance after normalizing is too large, and a large amount of internal stress is accumulated during rough turning. It is relatively uniform, and the internal stress distribution is not destroyed during cutting, so no serious bending deformation occurs. However, after the groove milling D process, due to its structural asymmetry, the internal stress balance is destroyed, resulting in serious bending deformation of the part, which eventually causes Product scrap

[0004] Since there is a small taper hole at C in the center hole at one end of the elevator shaft, and the small taper hole and the centers of the two shaft diameters A and B have strict runout requirements, the traditional process is currently used for processing. The second center hole is processed first, and then Two thimbles process the outer diameter of each gear, and then set the center frame at the position of the first shaft diameter, and then fine-boring the small taper hole on the end face. Since the small taper hole and the central hole are processed in two processes, there is always a certain error. In the end During the inspection of finished products, it was found that a considerable proportion of the small cone diameters of the products were out of tolerance, resulting in unstable product quality

Images