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Warm extrusion forming method for straight toothed spur gear

A straight-toothed cylindrical gear and warm extrusion technology, applied in the field of mechanical processing, can solve the problems of low product strength and service life, low material utilization rate, and low production efficiency, and achieve unique mold design, high material utilization rate, and high production efficiency. high efficiency effect

Inactive Publication Date: 2013-04-24
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, the current processing technology of spur gears has the following shortcomings: 1. Low material utilization rate; 2. Low production efficiency; 3. High product cost; 4. Low product strength and service life.

Method used

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  • Warm extrusion forming method for straight toothed spur gear
  • Warm extrusion forming method for straight toothed spur gear
  • Warm extrusion forming method for straight toothed spur gear

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0045] Take the warm extrusion forming of a standard spur gear with a modulus of 2, a number of teeth of 31, and a pressure angle of 20° as an example. The material is 20Cr2Ni4, and the shape and size of the refined billet are as follows figure 1 As shown, tooth width B=17.5mm; pitch circle diameter D=62mm; addendum circle diameter D 1 =66.9mm; the contour deviation between the refined billet and the standard gear is △=0.3mm.

[0046] method one:

[0047] The first step is to cut the material

[0048] Cut and turn the bar of Ф70 to obtain the shape and size of the designed blank, such as figure 2 shown. The bottom cylinder diameter is D=67.5mm; the top diameter d=57.5mm; H=35mm; h=15mm. This blank can be used to produce gear blanks with two tooth thicknesses at one time.

[0049] The second step mold preheating

[0050] Use an acetylene...

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Abstract

The invention discloses a warm extrusion forming method for a straight toothed spur gear. The blank is heated by adopting warm forming and combining differential temperature forming, and reasonable die design and lubricating selection are realized. According to the technical scheme, the first method comprises the following steps of extruding, upsetting and performing reverse secondary extrusion (in the same set of extrusion set); and the second method comprises the following steps of extruding and performing reverse secondary extrusion (concave dies of different sizes). According to the forming process, the forming force can be effectively reduced, and the tooth filling form is good. The warm extrusion forming method has the advantages that the defects that the cutting machining method is low in material utilization rate, low in production efficiency and high in product cost and the gear strength and service life are reduced because the metal fiber is cut are overcome; and meanwhile, the problems that the other plastic forming methods are high in forming force, difficult in corner filling and short in service life of the die and the like are solved, and the warm extrusion forming method is expected to realize industrial production of straight toothed spur gears in the field of plastic forming.

Description

technical field [0001] The invention relates to a mechanical processing method, in particular to a warm extrusion forming method of spur gears. Background technique [0002] As one of the most basic parts for transmitting motion and power, gears are widely used in the engineering field, especially in the manufacturing industry. Among them, spur gears are not only complex in shape, but also require high dimensional accuracy, surface quality and comprehensive mechanical properties, and have the characteristics of large production batches. At present, most spur gears are produced by traditional cutting methods, which have low material utilization rate, low production efficiency, high product cost, and at the same time, the strength and service life of gears are reduced due to the cutting of metal fibers. In short, the current processing technology of spur gears has the following disadvantages: 1. Low material utilization rate; 2. Low production efficiency; 3. High product cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/02
Inventor 赵军王炜马瑞
Owner YANSHAN UNIV
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