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Precision die forging and shaping technical method for automobile steering knuckle rough type parts

An automobile steering knuckle and precision die forging technology, which is used in vehicle parts, railway car body parts, transportation and packaging to reduce contact friction resistance, improve surface quality, and improve utilization.

Inactive Publication Date: 2014-07-09
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although multi-directional die forging can forge complex-shaped forgings that cannot or are difficult to produce by other types of forging methods, no one has studied automobile steering knuckles by using multi-directional die forging precision forming technology

Method used

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  • Precision die forging and shaping technical method for automobile steering knuckle rough type parts
  • Precision die forging and shaping technical method for automobile steering knuckle rough type parts
  • Precision die forging and shaping technical method for automobile steering knuckle rough type parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: 6700 Steering Knuckle Blank Precision Forging Process

[0034]After structural optimization, the precision forging process of 6700 steering knuckle blank is shown in Figure 1. Firstly, the 40Cr round steel with a diameter of 80 mm is cut by a band saw machine, and cut into a round bar with a length of 182 ± 2 mm as shown in Figure 1 (a). Then use a medium frequency induction heating furnace to heat the round bar to 1150±10°C. Put the heated round bar into the extrusion die. The diameter of the big end of the die is φ81mm, which is 1mm larger than the diameter of the bar, which is convenient for placing the bar. The diameter of the punch is the same as the diameter of the bar is φ80mm , the lower end of the die is the same as the optimized shape of the stem of the steering knuckle blank, and the bottom of the mold has a jacking device with the same diameter as the bottom end of the stem of the steering knuckle blank. After extrusion and elongation, a blank c...

Embodiment 2

[0035] Example 2: EQ153 Steering Knuckle Blank Precision Forging Process

[0036] After structural optimization, the precision forging process of the EQ153 steering knuckle blank is shown in Figure 3. First, use a band saw to cut 40Cr round steel with a diameter of 130 mm, and cut it into a round bar with a length of 185 ± 2 mm as shown in Figure 3 (a). Then use a medium frequency induction heating furnace to heat the round bar to 1160±10°C. Put the heated round bar into the extrusion die. The diameter of the big end of the die is φ132mm, which is 2mm larger than the diameter of the bar, which is convenient for placing the bar. The diameter of the punch is the same as the diameter of the bar is φ130mm , the lower end of the die is the same as the optimized shape of the stem of the steering knuckle blank, and the bottom of the mold has a jacking device with the same diameter as the bottom end of the stem of the steering knuckle blank. After extrusion and elongation, a blank c...

Embodiment 3

[0037] Example 3: SK1 Steering Knuckle Blank Precision Forging Process

[0038] After structural optimization, the precision forging process of SK1 steering knuckle blank is shown in Figure 5. The forging process is the same as the precision forging process of the 6700 steering knuckle blank in Example 1, except that the diameter and length of the raw material of the 40Cr round bar are different. The forged shape is different. In the process of multi-directional die forging, the plane shown by the arrow G shown in Figure 5(d) is used as the horizontal parting surface of the upper and lower dies, as shown in Image 6 The parts where the middle arrows H and I are located and the parts where the arrows J and K are located are front and rear symmetrical in the middle as the vertical parting surface. Compared with the traditional upper and lower die forging SK1 steering knuckle blanks, the SK1 steering knuckle obtained by this precision die forging process has been optimized and ...

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Abstract

The invention provides a precision die forging forming process for automobile steering knuckle blank parts, which mainly includes blanking, heating, extrusion and elongation of the rod, pre-forging and upsetting, multi-directional precision die forging forming processes; The material is heated to 1080°C to 1180°C in an intermediate frequency induction furnace; the heated round bar is put into the die of the extrusion elongation die to form a blank composed of a cylindrical surface and a steering knuckle blank rod; the upsetting The raw material after rough splitting is put into the multi-directional die forging die, the upper punch and the upper die seat in the vertical direction go down first, and the upper punch and the lower die are forged together; the symmetrical left and right punches in the horizontal direction Then extrusion precision forging molding. In the method of the present invention, since the die forging is performed on a multi-directional die forging hydraulic press, its forming speed is much lower than that of the hammer die forging, and there is no phenomenon that cracks occur on the surface due to high speed sensitivity due to excessive speed; It can greatly reduce the contact friction resistance between the forging and the surface of the die cavity in the process of die forging forming and forging ejection, further improve the surface quality of forgings, and improve the utilization rate of forging materials.

Description

technical field [0001] The invention relates to a precision die forging forming process for automotive steering knuckle blank parts, and belongs to the technical field of plastic forming of metal materials. Background technique [0002] In recent years, with the rapid development of the machinery industry, especially the automobile industry, and the intensification of international competition, the design and production of auto parts with high precision, high performance, high efficiency, low cost, and low energy consumption have become an important part of improving product competitiveness. the only way. Steering knuckle is one of the key parts of the car. As a safety part, it not only supports the weight of the car body, but also transmits the steering torque and bears the braking torque of the front wheel. Therefore, the requirements for its mechanical properties and shape and structure are very strict. Forging High difficulty. The high complexity of the geometry of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21K7/12B21J5/02B21J1/06
Inventor 周志明唐丽文罗静胡洋张宝亮罗荣胡治姚照云
Owner CHONGQING UNIV OF TECH
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