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Forging technology of long shaft type half shaft gear

A kind of half shaft gear and processing technology, which is applied in the direction of manufacturing tools, metal processing equipment, wheels, etc., can solve the problems of affecting the forming of the small end of the long axis, affecting the forging speed and quality, and the quality of the workpiece cannot be guaranteed. The effect of improving the utilization rate of materials, improving the quality of forging and improving the accuracy of workpieces

Active Publication Date: 2016-02-03
SICHUAN ZHONGYOU MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, because the cavity of the concave mold of the long half axis is very deep, it is easy to accumulate air inside, which affects the forming of the small end of the long axis, and the quality of the workpiece cannot be guaranteed; secondly, in order to release the mold smoothly, it is necessary to increase the draft angle of the concave mold , generally 8 to 10 degrees, which increases the difficulty of materials and subsequent machining; moreover, forgings are easy to stick in the die, and when they are knocked down, they are easy to hit the toothed die or the ground to form an irreversible collision. Injury, resulting in defective products, affecting the forging speed and quality; Finally, different molds are used in the pre-forging and final forging processes, which affect the precision of forged workpieces

Method used

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  • Forging technology of long shaft type half shaft gear
  • Forging technology of long shaft type half shaft gear
  • Forging technology of long shaft type half shaft gear

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mold design, production and installation

[0029] Such as figure 1 , 2 Shown, a kind of forging mold of long-axis type side shaft gear, this mold is a composite mold, including a combined upper mold and a combined lower mold; the combined lower mold includes a die 6 and an ejector assembly; the combined upper mold Including tooth mold 1. The workpiece 9 is ejected by the ejector assembly, so the draft angle 8 of the cavity of the die 6 is 2-3 degrees, and the workpiece 9 can be taken out after a small distance is ejected. Effectively reduce materials, improve material utilization, and increase economic benefits. And the concave die 6 is lower, which can reduce the bruising of the tooth surface of the workpiece 9, improve the quality of forging processing, and is beneficial to subsequent machining. Guide assemblies are arranged at corresponding positions of the combined upper mold and the combined lower mold. It ensures the accurate positioning of the upper and lowe...

Embodiment 2

[0042] The forging process of the long-shaft side-shaft gear, the raw material is 20CrMnTiH round steel, according to the following steps:

[0043] (1) Preheating: preheating the mold cavity, the preheating temperature is 300-320°C, and the duration is about 30 minutes;

[0044] (2) Heating: bad material heating, the heating temperature is 950-970 ℃, and the heating cycle is 28 seconds for one piece; the medium frequency induction furnace is used for heating, and the power frequency is about 600KW / 1KHZ;

[0045] (3) Pre-forging: use the mold described in Example 1; use the forging pliers to clamp the heated blank into the die cavity 6 of the mould, step on the striking plate, the toothed mold 1 presses down, and the workpiece 9 About 80% preformed, one forging time, about 8 seconds;

[0046] (4) Removal of oxide skin: Take out the pre-forging, and use a grinder with a stainless steel wire brush to remove the oxide skin on the surface of the pre-forging; at the same time, the ...

Embodiment 3

[0051] The forging process of the long-shaft side-shaft gear, the raw material is 20CrMnTiH round steel, according to the following steps:

[0052] (1) Preheating: Preheating the mold cavity, the preheating temperature is 330-350°C;

[0053] (2) Heating: bad material heating, the heating temperature is 980-1000 ℃, and the heating cycle is 28 seconds for one piece; the medium frequency induction furnace is used for heating, and the power frequency is about 600KW / 1KHZ;

[0054] (3) Pre-forging: use the mold described in Example 1; use the forging pliers to clamp the heated blank into the die cavity 6 of the mould, step on the striking plate, the toothed mold 1 presses down, and the workpiece 9 About 80% preformed, one forging time, about 8 seconds;

[0055] (4) Removal of oxide skin: Take out the pre-forging, and use a grinder with a stainless steel wire brush to remove the oxide skin on the surface of the pre-forging; at the same time, the air gun blows away the oxide skin in ...

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Abstract

The invention relates to the technical field of precision forging in mechanical manufacturing industry, and aims at providing a forging technology of a long shaft type half shaft gear. By means of the technology, the material utilization rate is effectively improved, economic benefits are increased, and the forming quality is improved. The forging technology of a long shaft type half shaft gear comprises the following steps of 1, preheating; 2, heating; 3, preforging, wherein a combined die is adopted, a combined lower die comprises a female die, the draft angle of a female die cavity is 2-3 degrees, a combined upper die comprises a toothed die, and the female die is provided with one or more positioning concave portions; 4, descaling; 5, finish forging, wherein the die used in the preforging procedure is adopted for finish forging, and the draft angle of the female die cavity of the die is 2-3 degrees. Material consumption is reduced, the material utilization rate is improved, and economic benefits are increased. Due to the fact that the positioning concave portion is arranged on the female die, secondary positioning is well ensured, in this way, the same die can be used for the preforging procedure and the finish forging procedure, and the precision of a forged workpiece is improved.

Description

technical field [0001] The invention relates to the technical field of precision forging in the machinery manufacturing industry, in particular to a forging process of long-shaft side-shaft gears. Background technique [0002] The automobile differential is a differential transmission mechanism, which is used to ensure the power transmission of each driving wheel under various sports conditions and avoid slippage between the tire and the ground. The shape of the side gear is composed of a bevel gear and a stepped cylinder. As an important part of the automobile differential, the demand is large and the precision is high. [0003] For the precision forging of axle gears of automobile differential, the forging process often used is the forging process of bad material heating, pre-forging, trimming, descaling, and final forging. The forging process uses a mold to obtain a semi-finished product with tooth shape and long axis formed, and after forging, the final product is obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/30B21J5/02B21J1/06B21J13/02
CPCB21J1/06B21J5/02B21J13/02B21K1/30
Inventor 冯文茂张婧王东
Owner SICHUAN ZHONGYOU MACHINERY
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