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A local induction heating extrusion forming method for large gears

A technology of induction heating and extrusion forming, applied in the field of material processing, can solve problems such as harsh equipment conditions, and achieve an effective production method and the effect of reducing the forming force

Active Publication Date: 2018-12-07
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such harsh equipment conditions cannot be met by the current domestic and international machinery manufacturing fields.

Method used

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  • A local induction heating extrusion forming method for large gears
  • A local induction heating extrusion forming method for large gears
  • A local induction heating extrusion forming method for large gears

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The modulus of a large gear is 25, the number of teeth is 40, the tooth width is 200mm, the diameter of the inner hole of the gear is 250mm, and the material is 42CrMo alloy steel. This case is realized through the following steps:

[0028] (1) Blank: the cross-sectional area of ​​the gear is 730577.969mm 2 , Turning a circular blank 8 with an inner diameter of 250mm, an outer diameter of 1000mm, and a thickness of 200mm, the cross-sectional area of ​​the blank is 736310.78mm 2 , which is 1.008 times the area of ​​the gear link. A conical shallow pit with a diameter of 400mm is processed on the lower end of the blank as a positioning structure.

[0029] (2) Feeding: The ejector mechanism of the forming equipment pushes the ejector to a position where its top surface is slightly higher than the top surface of the induction heating coil, puts the blank on the ejector, and passes through the cone on the upper surface of the ejector. Precise positioning of the shaped boss...

Embodiment 2

[0034] The modulus of a large gear is 20, the number of teeth is 60, the tooth width is 240mm, the inner hole of the gear is 280mm, and the material is 45 steel. This case is realized through the following steps:

[0035] (1) Blank: the cross-sectional area of ​​the gear is 1064486.820mm 2 , Turning a circular blank 8 with an inner diameter of 280mm, an outer diameter of 1203mm, and a thickness of 240mm, the cross-sectional area of ​​the blank is 1075060.mm 2 , which is 1.01 times the area of ​​the gear link. A conical shallow pit with a diameter of 500mm is processed on the lower end of the blank as a positioning structure.

[0036] (2) Feeding: The ejector mechanism of the forming equipment pushes the ejector to a position where its top surface is higher than the top surface of the induction heating coil, puts the blank on the ejector, and passes through the taper on the upper surface of the ejector. The boss is precisely positioned with the conical recess provided on the ...

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Abstract

A large gear local induction heating extrusion molding method comprises the following steps: 1, making a blank with the cross-sectional area being 1.005-1.01 times the cross-sectional area of a gear; 2, feeding the blank, wherein the top surface of the blank on a blank supporting device is higher than or equal to the top surface of an induction coil; 3, heating the blank, wherein the heating depth is 1.5-1.8 times the height of the gear; 4, extruding the blank which is in contact with a convex area in a female die into the outer concave of the female die in order to form the gear and a tooth form; and 5, carrying out heat treatment and finishing. A die in the invention mainly comprises a lower die seat, the female die, a pressure head, a guide sleeve, an upper die seat, a pressure head fixing piece, a guide column, an ejector, an ejection rod, the induction heating coil and a control system. The molding force of the large gear during forging is reduced by about 85-90%, the near-net forming of the large gear tooth form is realized, and an economic and effective production method is provided for the production of the large gear.

Description

Technical field: [0001] The invention relates to a material processing method, in particular to a plastic forming method for large gears. Background technique: [0002] Gears are one of the most widely used basic components in mechanical transmission. The annual demand for gears in various countries is very large. Gear manufacturing technology has a great impact on the quality and cost of gears. [0003] The most critical technology in gear manufacturing is its tooth profile processing. There are many tooth profile processing methods. According to whether there is cutting in the processing process, it can be divided into two categories: non-cutting and cutting. [0004] The tooth shape is processed by the non-cutting processing method, also known as the plastic forming method, including hot-rolled gears, cold-rolled gears, precision forging, fine blanking, powder metallurgy and other processes. Non-cutting processing has a series of advantages such as high productivity, le...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C25/02B21C23/14B21C29/00B21K1/30
CPCB21C23/14B21C25/02B21C29/00B21K1/30
Inventor 李纬民刘秀侠秦越温瑞洁
Owner YANSHAN UNIV