Hot and cold composite precision forging forming method of great-modulus high-thickness straight-tooth cylindrical gear

A spur gear, cold compound technology, applied in the field of metal plastic processing, can solve the problems of shortening the life of the cold finishing die, the stress concentration of the toothed die, affecting the performance of the final part, etc., so as to achieve less machining time and reduce stress. Concentration phenomenon, high material utilization effect

Inactive Publication Date: 2012-06-13
BEIJING RES INST OF MECHANICAL&ELECTRICAL TECH +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the investment in hot forging equipment is low and the mold is simple, the shortcomings of low material utilization, low production efficiency, and high energy consumption cannot be overcome. In addition, because the heating temperature of the material is high during hot forging, defects such as scale on the surface of the forging are obvious, and it is necessary to reserve Larger machining allowance is required, and in order to fill the forgings full, reduce the forming force, and improve the life of the die, it is often necessary to increase the initial forging temperature of the blank. Higher heating time and temperature will deepen the decarburization layer on the surface of the forging. Affects the performance of the final part
In recent years, some enterprises and research institutions have begun to adopt the compound forming method of hot forging and closed cold finishing to tria

Method used

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  • Hot and cold composite precision forging forming method of great-modulus high-thickness straight-tooth cylindrical gear
  • Hot and cold composite precision forging forming method of great-modulus high-thickness straight-tooth cylindrical gear

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Example Embodiment

[0007] Embodiments of the present invention are further described below:

[0008] The steps of the cold extrusion compound forming method for large modulus and high thickness spur gears are: (1) blanking → (2) upsetting after heating → (3) hot die forging → (4) annealing intermediate treatment → (5) Cold forward extrusion → (6) machining center hole → (7) annealing intermediate treatment → (8) cold finishing.

[0009] (1) Cutting: The round steel bar is cut into a billet of a certain length, and after passing the electronic weighing inspection, a qualified original billet is obtained.

[0010] (2) Upsetting after heating: The billet is heated to the initial forging temperature by heating equipment, and the upsetting station of the heated billet on the press is upset into a drum shape.

[0011] (3) Hot die forging: Hot die forging the upsetting blank into a tooth-shaped forging blank. The tooth shape of the forging blank is the upper half of the tooth shape approximate to the ...

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Abstract

The invention provides a hot and cold composite precision forging forming method applied to a great-modulus high-thickness straight-tooth cylindrical gear, and belongs to the technical field of metal plastic processing. The hot and cold composite precision forging forming method adopts the following steps of: baiting, upsetting after heating, hot die forging, annealing middle treatment, cold forward extrusion, center hole processing, annealing middle treatment and cold finishing, wherein the deformation quantity is reasonably distributed in three forming work procedures, certain tooth shapes are formed by the hot die forging work procedure, then, the cold forward extrusion process is adopted for further forming complete tooth shapes, and better surface quality is formed through radial and axial material flowing. Through the center hole processing work procedures, the stress concentration phenomenon during the closed cold finishing can be effectively reduced, and the service life of a mold is improved. Through the cold finishing work procedure, the tooth surface precision can be further improved, simultaneously, the defect of imperfect gear sectional surface filling generated in the cold extrusion work procedure is eliminated, and finally, the tooth-shaped surface of a forge element can directly reach gear hobbing and gear milling precision.

Description

technical field [0001] The invention relates to a compound precision forging forming method, in particular to a hot-cold compound precision forging forming method of a spur gear with a large modulus and high thickness, and belongs to the technical field of metal plastic processing. Background technique [0002] Spur gears are important transmission parts widely used in automobiles, aerospace, machinery and other industries. Their shapes are complex, and their materials, dimensional accuracy, surface quality, and mechanical properties have high requirements. In order to improve the utilization rate of materials and the mechanical properties of gear parts, forging is now used in China to produce gear forgings, which are then machined into gear parts. For small-sized spur gears, some domestic manufacturers have realized the cold precision forging process, and the tooth profile surface can be realized with little or no machining. There are currently two main methods for produci...

Claims

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Application Information

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IPC IPC(8): B23P15/14B21J5/02B21C23/14
Inventor 边翊钟志平
Owner BEIJING RES INST OF MECHANICAL&ELECTRICAL TECH
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