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Precision forming method and device of flanged flat gears

A precision forming and gear technology, applied in forging/pressing/hammer devices, wheels, transportation and packaging, etc., can solve the problems of insufficient filling of gear teeth and increased extrusion force, so as to control the cost of a single piece and facilitate the production of a single piece Cost, the effect of guaranteeing the life of the mold

Active Publication Date: 2014-04-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, occluded extrusion requires accurate calculation of the billet volume. Too small a volume will easily lead to insufficient filling of the gear teeth, and too large a volume will greatly increase the extrusion force. In actual production, the weight of the material needs to be strictly controlled; in addition, occluded extrusion Requires complex occlusion molds to achieve

Method used

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  • Precision forming method and device of flanged flat gears
  • Precision forming method and device of flanged flat gears
  • Precision forming method and device of flanged flat gears

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0029] Such as figure 1 As shown, this embodiment includes the following steps:

[0030] The first step, blank preparation, adopts strip material, such as image 3 As shown, the thickness of the blank is taken as the thickness of the tooth portion of the involute tooth, and the width of the blank is 1.2 times the diameter of the addendum circle; the strips used must be spheroidized annealed, and the spheroidization rate is greater than or equal to 85%.

[0031] The second step is to punch the center hole, which is a process auxiliary hole and plays the role of a diverter hole in the next forming process. The diameter of the central hole is reduced by 1.0 mm on one side compared with the pre-punched hole.

[0032] The third step is to extrude the annular groove to form the upper flange. The annular groove is obtained by extrusion deformation. During the extrusion process, the excess metal flows radially inward into the center hole. After the annular groove is extruded, the up...

Embodiment 2

[0038] Such as figure 2 Shown, be applied to the device of embodiment 1, this device is the compound mold that is used for flanging and upsetting and comprises: patrix, counterdie, upper die and lower punch, wherein: patrix moves downward earlier, and The lower mold presses the billet together and applies a pressure of 15 MPa, the lower punch moves upward to form the flanging, and then the floating-controlled upper die moves downward to upset to the target height of the lower flange of the gear to be manufactured.

[0039] The floating control refers to using an independent hydraulic pump to control the upward or downward movement of the upper die.

[0040] The upper die is a simple ring structure, which is convenient for its processing and manufacturing, and is driven by a floating control unit to work.

Embodiment 3

[0042] This embodiment includes the following steps:

[0043] The first step, blank preparation, adopts strip material, such as Figure 4 As shown, the thickness of the blank is taken as the thickness of the tooth part of the rectangular gear, and the width of the blank is 1.1 times the diameter of the addendum circle; the strips used must be spheroidized annealed, and the spheroidization rate is greater than or equal to 85%.

[0044] The second step is to punch the center hole, which is a process auxiliary hole and plays the role of a diverter hole in the next forming process. The diameter of the central hole is reduced by 1.5 mm on one side compared with the pre-punched hole.

[0045] The third step is to extrude the annular groove to form the upper flange. The annular groove is obtained by extrusion deformation. During the extrusion process, the excess metal flows radially inward into the center hole. After the annular groove is extruded, the upper flange of the gear part ...

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Abstract

Disclosed is a precision forming method and device of flanged flat gears. A blank for manufacturing a gear is punched first to obtain an auxiliary center hole which functions in distributing in the forming process; compression deforming is performed to obtain a circular groove so as to form an upper flange of the gear, flanging and upsetting are performed after pre-punching, and the edge material pre-punched transfers to move a lower flange; a gear ring press plate is used for precision punching to obtain a gear shape. The precision forming method and device of flanged flat gears has the advantages that batch continuous production of gears is achieved, cutting steps are effectively decreased, materials are more available, production efficiency is improved, and cost of a single product is reduced.

Description

technical field [0001] The invention relates to a method in the field of gear manufacturing, in particular to a precision forming method and device for a flat gear with a flange. Background technique [0002] Gear is a typical mechanical transmission part, which has the advantages of compact structure, accurate transmission ratio, large transmission power, high efficiency, high reliability and long life. It is widely used in the machinery industry, among which spur gears are various gears The most widely used one. Therefore, the precision manufacturing process of spur gears has always attracted much attention. [0003] Spur gears generally adopt three precision forming manufacturing methods, one is extrusion forming, that is, the outer diameter of the initial bar is greater than or equal to the diameter of the addendum circle, and the gear parts are mainly obtained through extrusion deformation and axial flow of materials; however, such methods It is easy to form an incomp...

Claims

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Application Information

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IPC IPC(8): B21K1/30B21J13/02
Inventor 胡成亮苗培壮
Owner SHANGHAI JIAO TONG UNIV
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