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Precision forming method and device for flat gear with flange

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

Active Publication Date: 2015-08-19
SHANGHAI JIAOTONG 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 for flat gear with flange
  • Precision forming method and device for flat gear with flange
  • Precision forming method and device for flat gear with flange

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0030] The first step, blank preparation, using strips, such as image 3 As shown in the figure, the thickness of the blank is taken as the thickness of the involute gear teeth, and the width of the blank is 1.2 times the diameter of the tip circle; the strip used needs to be spheroidized and 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 shunt hole in the next forming process. Compared with the pre-punched hole, the diameter of the central hole is reduced by 1.0 mm on one side.

[0032] The third step is to extrude the annular groove to form the upper flange, and obtain the annular groove through extrusion deformation. During the extrusion process, the excess metal flows radially inward into the central hole, and the annular groove naturally forms the upper flan...

Embodiment 2

[0038] like figure 2 As shown, applied to the device of Embodiment 1, the device is a composite mold for flanging and upsetting, including: an upper mold, a lower mold, an upper concave mold and a lower punch, wherein: the upper mold moves downward first, and the The lower die jointly presses the blank and applies a pressure of 15MPa, the lower punch moves upwards to form flanging, and then the floating-controlled upper die moves downwards to upsetting to the target height of the lower flange of the gear to be fabricated.

[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 manufacture, and is driven by a floating control unit.

Embodiment 3

[0042] This embodiment includes the following steps:

[0043] The first step, blank preparation, using strips, such as Figure 4 As shown in the figure, the thickness of the blank is taken as the thickness of the teeth of the rectangular gear, and the width of the blank is 1.1 times the diameter of the tip circle.

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

[0045] The third step is to extrude the annular groove to form the upper flange, and obtain the annular groove through extrusion deformation. During the extrusion process, the excess metal flows radially inward into the central hole, and the annular groove naturally forms the upper flange of the gear part after extrusion. .

[0046] The fourth step is to punch the central waste hole, punch out the waste formed by...

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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 method and a device for precision forming of a flanged flat gear. Background technique [0002] Gear is a typical mechanical transmission part. It 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 them, 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 use three precision forming manufacturing methods, one is extrusion forming, that is, the initial bar outer diameter is greater than or equal to the diameter of the tooth tip circle, and the gear parts are mainly obtained through extrusion deformation and axial flow of materials; however, this type of method It is easy to form an underfille...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21K1/30B21J13/02
Inventor 胡成亮苗培壮
Owner SHANGHAI JIAOTONG UNIV
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