Finish machining method of electric runout rotor shaft
A technology of electric runout and rotor shaft, which is applied in metal processing equipment, machine tools designed for grinding the rotating surface of workpieces, and manufacturing tools, etc., can solve the problems of high electric runout detection requirements and low product yield.
Active Publication Date: 2020-12-25
宝鼎重工有限公司
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Problems solved by technology
Due to the high requirements for the detection of electric runout, very high requirements are put forward for the material, heat treatment, finishing, and detection of the rotor shaft. Previously, due to the low yield of products, a well-known international company in the field of electric motors has been putting this project in the Finnish factory. Production, currently there is no manufacturer in China to manufacture this product
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[0033] Refer to attached Figure 1-9 . The forging blank of Bentley electric beating rotor shaft weighs 2.302 t. The material specification for forging is 3t electroslag remelted ingot, and one ingot is forged; the forging ratio is 7.2; forging temperature: 1180℃~850℃. The rough forging of Bentley electric beating rotor shaft is shown in the figure figure 2 .
[0034] 1. Steel ingot heating:
[0035] The 3t electroslag remelting ingot of 42CrMo4 material is heated in two stages, and the specific heating process is as follows: image 3 .
[0036] 2. Forging process:
[0037] Steel ingot upsetting, drawing 600 octagonal, about 1150 long; secondary upsetting, drawing 370 octagonal, sub-material pressing table; drawing long, completed.
[0038] 3. Heat treatment after forging:
[0039]The post-forging heat treatment has a significant impact on the internal quality of the forging and the next performance heat treatment. Therefore, in order to eliminate the forging internal ...
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Abstract
The invention relates to a finish machining method of a rotor shaft. The total length of a finished product obtained after finish machining of the rotor shaft is larger than or equal to 3744mm, the diameter phi of an iron core is larger than or equal to 1000mm, the weight of the finished product is larger than or equal to 6258kg, the rotor shaft is mainly used in application fields of high-end products such as petroleum exploration equipment, a marine motor and the like, electroslag remelting ingots are adopted for raw materials, the material utilization rate is adjusted to be 65%, risers andnozzle ends are sawed off before forging, and the purity of the raw materials is improved. A reasonable forging process is formulated, and a two-upsetting and two-stretching forming process is adoptedfor forging; a reasonable heat treatment process is formulated to eliminate stress and refined grains, and a final heat treatment process is compiled according to strength grade requirements, so thatthe mechanical properties of the product meet use requirements; and after 1.5mm allowance of a single side is reserved through rough machining, 180-DEG C low-temperature stress relief heat treatmentis added, and machining stress of a cutting machine is removed. In the aspect of machining, the technological process including steps of rough machining, semi-finish machining, low-temperature stressrelief heat treatment, trimming of center holes, finish turning, milling of a key groove, fine trimming of the center holes, grinding of a gear for inlaying iron core, hot inlaying of the iron core, rough grinding, fine grinding, polishing extrusion, electric runout detection, packaging and delivery is adopted.
Description
technical field [0001] The invention relates to a rotor shaft whose total length reaches ≥3744mm after finishing, iron core diameter ≥diameter φ1000mm, and finished product weight ≥6258kg. Background technique [0002] As the core part of the motor, the Bently electric runout rotor shaft increases the detection requirements of the Bently electric runout detection instrument compared with other rotor shafts. Due to the high requirements for the detection of electric runout, very high requirements are put forward for the material, heat treatment, finishing, and detection of the rotor shaft. Previously, due to the low yield of products, a well-known international company in the field of electric motors has been putting this project in the Finnish factory. Production, currently there is no manufacturer in China to manufacture this product. Contents of the invention [0003] Design purpose: To design a length of ≥3744mm, ≥shaft diameter φ320, iron core diameter ≥φ1000 and can ...
Claims
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IPC IPC(8): B23P15/14B24B5/04B24B37/00B24B39/00
CPCB23P15/14B24B5/04B24B37/00B24B39/00
Inventor 吕斌杰卫滨沈晓良冷怡恺凌超强
Owner 宝鼎重工有限公司