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Spur-toothed cylindrical gear precision forging split-flow depressurization compound forming method and its mold

A spur gear and precision forging technology, which is used in manufacturing tools, forging/pressing/hammer devices, forging/pressing/hammering machinery, etc. The problems of low warm forging accuracy and oxidation of hot forging surface can achieve the effect of promoting radial flow and flow uniformity, high dimensional accuracy, and good forging structure.

Active Publication Date: 2020-12-25
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 problem of the high cost of the existing method for processing large modulus spur gears for helicopters, the hot forging surface layer will be severely oxidized, the warm forging precision is not high, and the cold forging forming pressure is too high to realize the precise forging of large modulus gears. In order to solve the problem, a method of precision forging, splitting and depressurizing composite forming of large modulus spur gears for helicopters and its mold are provided.

Method used

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  • Spur-toothed cylindrical gear precision forging split-flow depressurization compound forming method and its mold
  • Spur-toothed cylindrical gear precision forging split-flow depressurization compound forming method and its mold
  • Spur-toothed cylindrical gear precision forging split-flow depressurization compound forming method and its mold

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specific Embodiment approach 1

[0020] Specific implementation mode 1: In this implementation mode, a precision forging split-flow and step-down composite forming method for large-modulus spur gears for helicopters is specifically carried out according to the following steps:

[0021] 1. Blanking: According to the design of gear parts, the steel bar is cut to get the blank;

[0022] 2. Thickening: the blank is heated to 1160°C by a gas furnace, and the blank is placed on the roughening platform within 8 seconds after being taken out, the roughening pressure is set to 300T, the roughening pressure is 36mm, and the scale is removed to obtain the roughened blank;

[0023] 3. Hot forging and pre-forging: the thickened blank is transferred to the cavity of the hot forging pre-forging forming mold, and after being fixed, hot forging is carried out to obtain the pre-forging gear blank;

[0024] 4. Drill the center hole: Drill a center split hole with a diameter of 30 mm in the center of the pre-forged gear blank to...

specific Embodiment approach 2

[0031] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the gear unilateral margin of the gear part described in step one is selected as 0.3mm, and the gear part volume V 0 =189691.2mm 2 , the oxidation amount of the part is taken as 3%, and the volume of the forging is V 1 =V 0 (1+3%)=195382mm 2 , considering that the size of the subsequent pier thick cylindrical blank is 52mm in diameter and 92mm in height. Others are the same as the first embodiment.

specific Embodiment approach 3

[0032] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the upper and lower corners of the pre-forged gear blank obtained in step 3 are not completely filled, and the upper and lower end faces are prefabricated with diversion areas. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention particularly relates to a precision forging split depressurization compound forming method and die of a big-modulus spur gear for a helicopter, and belongs to the technical field of gearprecision forging forming. According to the forming method and die, the problems that the cost of an existing method for machining the big-modulus spur gear for the helicopter is high, and the hot forging surface of the big-modulus spur gear can be oxidized severely; the warming forging temperature is not high; and the cold forging forming pressure is high and consequently the precision forging of the big-modulus spur gear can not be achieved are solved. The compound forming method adopts a compound forming process of hot forging as pre-forging and warming forging as finish forging, and the billet stress and flow direction are regulated through the end face shape of upper and lower male dies in the pre-forging and finish forging process; the complete filling of serrated upper and lower corners is achieved; and the serrated forming accuracy is improved through the two steps of pre-forging and finish forging. The die comprises a guide device, a pre-tightening female die device, a male die device and an ejection device, and the forming method and die is used for compound forming of the big-modulus spur gear for the helicopter.

Description

technical field [0001] The invention belongs to the technical field of precision forging and forming of gears, and in particular relates to a method for precision forging, splitting and decompression composite forming of large-module spur gears for helicopters and a mold thereof. Background technique [0002] At present, most of the gears used in helicopters are processed by traditional cutting methods. The material utilization rate is low, the forging streamline of the teeth is damaged, the service life is low, and the product cost is high. With the research and development of new helicopters, higher requirements are put forward for gear performance and service life. Traditional cutting and manufacturing gears are difficult to meet the requirements. It is urgent to face the research and development of new materials or process improvement. The development of new materials is costly and long-term. Forging can realize the near-net shape of gear forgings with less cutting and n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00B21J13/02B21K1/30
CPCB21J5/002B21J13/02B21K1/30
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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