Processing technology of connecting rod shaft

A processing technology and connecting rod shaft technology, which is applied in the processing technology field of connecting rod shafts, can solve problems such as high scrap rate, increased manufacturing cost, and difficult processing, and achieve stable product quality, improved production efficiency, and improved economic efficiency Effect

Inactive Publication Date: 2015-04-08
GUIZHOU HONGXIANG BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The connecting rod shaft is a slender shaft. It is ground after quenching and cold treatment after machining. The quenching hardness is required to reach HRC62-64°, and the bearing precision is required to be higher than P4 level. The deformation of the shaft after quenching is relatively large. , the runout reaches about 2-3mm, and the runout after straightening is required to reach within 0.20mm. After the straightening treatment, some are still irreparable, and it is easy to cause breakage, which brings great difficulties to the processing, and the scrap rate is high. Using this process For a long time, the scrap rate has remained high, the manufacturing cost has increased significantly, and the cycle has been long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment provides a processing technology for a connecting rod shaft, including the following steps:

[0027] (1) Rough turning process, when the workpiece is rough turning, ensure that the workpiece is initially formed, and keep a margin of 0.5-1mm;

[0028] (2) Quenching treatment, keep the workpiece at 800-850°C, and carry out free forging for 15-20min;

[0029] (3) Finish turning processing, using cubic boron nitride, the tool is used to finish the shape of turning, and a margin of 0.3-0.4mm is reserved;

[0030] (4) Coarse grinding, keep a margin of 0.1-0.2mm;

[0031] (5) Stabilization treatment, place the workpiece in an environment of 200-300°C for 1-2 hours for stabilization treatment;

[0032] (6) Semi-fine grinding;

[0033] (7) Secondary stabilization treatment, placing the workpiece in an environment of 200-250°C for stabilization treatment for 1-2h;

[0034] (8) Fine grinding, and the connecting rod shaft is finished.

Embodiment 2

[0036] This embodiment provides a processing technology for a connecting rod shaft, including the following steps:

[0037] (9) (1) Rough turning, when the workpiece is rough turning, ensure that the workpiece is initially formed, and keep a margin of 0.8-1mm;

[0038] (2) Quenching treatment, keep the workpiece at 800-830°C, and carry out free forging for 15-18min;

[0039] (3) Finish turning processing, using cubic boron nitride, the tool is used to finish the shape of turning, and a margin of 0.3-0.35mm is reserved;

[0040] (4) Coarse grinding, keep a margin of 0.1-0.15mm;

[0041] (5) Stabilization treatment, place the workpiece in an environment of 250-300 °C for 1-1.5 hours for stabilization treatment;

[0042] (6) Semi-fine grinding;

[0043] (7) Secondary stabilization treatment, placing the workpiece in an environment of 200-250°C for 1.5-2 hours for stabilization treatment;

[0044] (8) Fine grinding, and the connecting rod shaft is finished.

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PUM

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Abstract

The invention provides a processing technology of a connecting rod shaft. The processing technology comprises the following steps of rough turning, quenching treatment, finish turning, rough grinding, stabilizing treatment, half-finish grinding, secondary stabilizing treatment and finish grinding. The processing technology has the advantages that by adopting the method, the quality of a product is stable, the quality of a bearing is greatly improved, the crystal grains can be fined by the surface strong heat treatment, the roughness of the bearing is improved, the defects of strip structures and the like can be reduced or eliminated, the integral impact property of the bearing is improved, the bearing structure is more uniform and stable, the air holes and sand holes are fewer, and the comprehensive mechanical property and corrosion-resistant property are better; the cycle is shortened, the consumption of a grinding wheel is decreased, the production efficiency is greatly improved, and the comprehensive economic efficiency is greatly improved in comparison with the prior art.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and in particular relates to a processing technology of a connecting rod shaft. Background technique [0002] The production of connecting rod bearings is processed by quenching treatment after turning - rough grinding - stabilization - semi-finishing - secondary stabilization - fine grinding and other processing procedures. The connecting rod shaft is a slender shaft. It is ground after quenching and cold treatment after machining. The quenching hardness is required to reach HRC62-64°, and the bearing precision is required to be higher than P4 level. The deformation of the shaft after quenching is relatively large. , the runout reaches about 2-3mm, and the runout after straightening is required to reach within 0.20mm. After the straightening treatment, some are still irreparable, and it is easy to cause breakage, which brings great difficulties to the processing, and the scrap rate is high. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14
CPCB23P15/14
Inventor 庄红谢新黔
Owner GUIZHOU HONGXIANG BEARING
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