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Large-modulus straight toothed spur gear precision forging cold-finish forming method for helicopter and die thereof

A spur gear and precision forging technology, which is applied in the manufacture of tools, wheels, forging/pressing/hammer devices, etc., can solve the problems of low die life, poor tooth surface quality, and low tooth profile accuracy, and improve gear performance and service life, improve tooth shape accuracy and surface quality, and improve the effect of forging accuracy

Active Publication Date: 2019-11-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low tooth shape accuracy, poor tooth surface quality and low mold life in the existing method for forming large modulus spur gears for helicopters, and to provide a large modulus spur gears for helicopters Gear Precision Forging Cold Finishing Forming Method and Its Die

Method used

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  • Large-modulus straight toothed spur gear precision forging cold-finish forming method for helicopter and die thereof
  • Large-modulus straight toothed spur gear precision forging cold-finish forming method for helicopter and die thereof
  • Large-modulus straight toothed spur gear precision forging cold-finish forming method for helicopter and die thereof

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specific Embodiment approach 1

[0014] Embodiment 1: In this embodiment, a method for precision forging and cold-finishing of large-modulus spur gears for helicopters is specifically carried out according to the following steps:

[0015] 1. Gear blank preparation: According to the design requirements of gear parts, blanking is carried out, and the center split hole is prefabricated in the center of the blank according to the size of the part to obtain the gear blank;

[0016] 2. Cold finishing: use cold finishing to reduce and extrude the tooth blank to obtain the tooth blank after cold finishing;

[0017] 3. End face trimming: remove the burrs on the end face of the tooth blank after cold finishing.

[0018] This embodiment improves the tooth shape precision and tooth surface quality of the forged gear, reduces the forming load, and realizes near-net shaping of the spur gear with large modulus. The forged gear is trimmed by cold finishing, which reduces the subsequent cutting process of the gear surface an...

specific Embodiment approach 2

[0021] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the diameter of the central distribution hole in Step 1 is 45mm. Others are the same as the first embodiment.

specific Embodiment approach 3

[0022] Specific embodiment three: the mold of the precision forging cold finishing forming method of large modulus spur gears for helicopters in this embodiment includes a pre-tightening die device and a punch device; the pre-tightening die device consists of die 5, pre-tightening die device Ring 4, lower backing plate 3 and die fixing ring 15, the interference fit between die 5 and pre-tightening ring 4, the die 5, pre-tightening ring 4, lower backing plate are connected by die fixing ring 15 and bolts 3 is connected with the lower template 1; the punch device is composed of a punch 11, a toothed mandrel 12, a punch fixing plate 7, an upper backing plate 10 and an upper template 6, and the punch 11 is a toothed punch, and the teeth are connected by bolts Shaped mandrel 12, punch 11, upper backing plate 10, punch fixing plate 7 are connected with upper template 6 to ensure that toothed mandrel 12 tooth tops correspond to punch 11 tooth roots, and toothed mandrel 12 tooth roots ...

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Abstract

The invention belongs to the technical field of gear precision forging forming, and particularly relates to a large-modulus straight toothed spur gear precision forging cold-finish forming method fora helicopter and a die thereof. The forming method aims to solve the problems that an existing large-modulus straight toothed spur gear forming method for the helicopter is low in tooth form precision, poor in tooth surface quality and low in die service life. According to the large-modulus straight toothed spur gear precision forging cold-finish forming method for the helicopter, the finishing quantity, the clearance of a punch-matrix, roller radius of a cavity plate, the transition section inclination angle of the cavity plate, and a mandrel structure in the finishing process are adjusted through the design of the punch-matrix and the mandrel structure in the cold-finish process, so that the whole tooth surface finishing is achieved; the mandrel structure is changed on the basis of hollow diverting, so that limitation to diverting is realized, the deformation uniformity of the tooth surface is improved, and the forming load in the finishing process is reduced. The die comprises a pre-tightening cavity plate device and a punch device. The die of the large-modulus straight toothed spur gear precision forging cold-finish forming method for the helicopter is used for the large-modulus straight toothed spur gear precision forging cold-finish forming.

Description

technical field [0001] The invention belongs to the technical field of precision forging and forming of gears, and in particular relates to a precision forging and cold-finishing forming method of large-module spur gears for helicopters and a mold thereof. Background technique [0002] At present, the forging process of large modulus spur gears mostly adopts composite forming process. In order to control the forming load, warm forging is mostly used in the final forging. There is a small amount of oxidation on the surface of the formed gear, resulting in low tooth profile accuracy and poor tooth surface quality. , while cold forging has low die life due to excessive forming load, and is mostly used for forming small modulus gears. Contents of the invention [0003] The purpose of the present invention is to solve the problems of low tooth shape accuracy, poor tooth surface quality and low mold life in the existing method for forming large modulus spur gears for helicopters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/02B21J13/02B21K1/30
CPCB21J5/027B21J13/02B21K1/30
Inventor 宗影影肖爽邵斌王继伟单德彬郭斌
Owner HARBIN INST OF TECH
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