Cold forging processing method of hardened and tempered structural steel

A processing method and technology of structural steel, applied in the field of steel cold forging, can solve problems such as incomplete metal streamlines, poor mechanical properties of parts, and influence on use safety, and achieve the effects of reducing dependence, improving fatigue strength, and saving energy

Inactive Publication Date: 2011-04-20
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional processing method of this kind of parts is quenching and tempering first and then cutting. The disadvantages of this method are: long processing hours, low production efficiency, high product cost, and lack of competitivenes

Method used

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  • Cold forging processing method of hardened and tempered structural steel
  • Cold forging processing method of hardened and tempered structural steel
  • Cold forging processing method of hardened and tempered structural steel

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] Take the forming process of a positive extrusion as an example, the process flow is:

[0029] 1. For billet making, select hot-rolled round bars with a diameter of φ30.0 mm, the material grade is 40Cr, and the material is cut by sawing, and the blanking length is controlled at 29.9-30.1 mm.

[0030] 2. Quenching and tempering. According to the performance requirements of the positive extrusion parts after forging, the quenching and tempering process is: heating to 850℃ in the furnace for quenching, then tempering at the temperature of 580℃, heat preservation for 2 hours and then air cooling.

[0031] 3. Conventional shot blasting process.

[0032] 4. Conventional phosphorus saponification process.

[0033] 5. Cold forging is formed by cold extrusion through a positive extrusion die. The diameter of the extruded part is 20.0 mm, and the degree of deformation is about 55.6%.

[0034] The metal streamlines of the obtained positive extrusion are continuously distribu...

Example Embodiment

[0035] Example 2

[0036] Take the forming process of the back extrusion as an example, the process flow is:

[0037] 1. For billet production, select hot-rolled round bars with a diameter of φ25.0 mm, the material grade is 40Cr, and the material is cut by sawing, and the blanking length is controlled at 24.9-25.1 mm.

[0038] 2. Quenching and tempering. According to the performance requirements of the positive extrusion parts after forging, the quenching and tempering process is: heating to 850℃ in the furnace for quenching, then tempering at the temperature of 630℃, heat preservation for 2 hours and then air cooling.

[0039] 3. Conventional shot blasting process.

[0040] 4. Conventional phosphorus saponification process.

[0041] 5. Cold forging is formed by cold extrusion with a reverse extrusion die. The diameter of the inner hole of the reverse extrusion is 15.8 mm, the bottom thickness is 10.0 mm, and the degree of deformation is about 40.0%.

[0042] The obtained inverse extrusio...

Example Embodiment

[0043] Example 3

[0044] Take the forming process of an automobile hub locking sleeve as an example. The automobile hub locking sleeve is a functional element used to lock the hub and the axle. The locking force that needs to bear reaches 100kN, so there are certain requirements for its strength, that is, small The end face hardness should be in the range of 25HRC~29.5HRC.

[0045] The process flow of this embodiment is:

[0046] 1. For billet production, since there is no tube material that meets the size specifications, a hot-rolled round bar with a diameter of 50.0 mm is selected, and the material grade is 20MnMoB, which is preformed by sawing, upsetting, reverse extrusion, thinning and stretching. After the process, a blank tube with an inner diameter of φ47.0 mm and an outer diameter of φ57.0 mm was obtained.

[0047] 2. Quenching and tempering. Since the locking sleeve needs to withstand a certain locking force when used, there are certain requirements for the hardness of the ...

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Abstract

The invention discloses a cold forging processing method of hardened and tempered structural steel, which belongs to the technical field of steel cold forging. The method comprises the following steps of: firstly, performing corresponding blank forming treatment on different blanks and performing quenching treatment and high-temperature tempering treatment so as to obtain a structural steel hardened and tempered blank; secondly, blowing steel shots out of a barrel-type shot blasting machine by using compressed air, continuously impacting the steel shots onto the hardened and tempered structural steel blank and phosphating and saponifying the structural steel blank; and lastly, deforming the structural steel blank by using a cold forging mold in a cold extruding or cold heading way so as to obtain a precision forming part. The classical cold forging process is changed completely, softening treatment is not performed before cold forging of a steel material, a mechanical part with high size accuracy and high comprehensive mechanical property is processed by material hardening and tempering treatment and cold forging deformation and reinforcement, and subsequent thermal treatment is not needed after cold forging forming.

Description

technical field [0001] The invention relates to a method in the technical field of steel cold forging, in particular to a cold forging processing method of quenched and tempered structural steel. Background technique [0002] In the processing and manufacturing process of mechanical parts, in order to improve the processing performance of metal parts and the mechanical properties of parts, heat treatment is often used as an important process in the processing process, and quenching and tempering treatment is the most common and most convenient and practical A method of heat treatment. There is a class of mechanical parts that need to be used in a quenched and tempered state to meet the strength and rigidity requirements, such as various transmission shafts, connecting rods, gears, high-strength connectors, etc. The traditional processing method of this kind of parts is quenching and tempering first and then cutting. The disadvantages of this method are: long processing hour...

Claims

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Application Information

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IPC IPC(8): B21J5/00B21J1/00B21J13/02
Inventor 赵震胡成亮徐祥龙
Owner SHANGHAI JIAO TONG UNIV
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