Universal elevator axis processing technique

A processing technology, general elevator technology, applied in the direction of shaft, shaft and bearing, mechanical equipment, etc., can solve the problems of uneven material structure, asymmetric structure, out of tolerance of small cone aperture, and achieve the improvement of internal structure uniformity, The effect of reducing internal stress accumulation and increasing the normalizing cooling rate

Inactive Publication Date: 2007-09-26
SHANGHAI NO 1 AUTOMOBILE GEAR FACTORY
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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 o

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Embodiment

[0018] As shown in Figures 1 and 2, it is a schematic diagram of the elevator shaft structure. It is a general elevator shaft processing technology, which consists of 5 processes of rough turning, fine turning, milling, calibration, and fine grinding of the shaft diameter before normalizing. The process is as follows: :

[0019] The first step. Rough turning before normalizing: before normalizing, remove most of the machining allowance of the bar, so that the allowance at D of the bar is 30mm-50mm, and then normalize the bar. The normalizing temperature is 710°C;

[0020] The machining datum of shaft parts is the center hole. According to the principle of datum first, the center hole is usually processed first, but generally there is a small taper hole C in the center hole of the elevator shaft, and the small taper hole is connected with the diameters A and B of the two shafts. The center line has strict runout requirements. Therefore, during rough machining, the end face and...

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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...

Claims

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Application Information

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IPC IPC(8): F16C3/02
Inventor 徐兵樊培芬
Owner SHANGHAI NO 1 AUTOMOBILE GEAR FACTORY
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