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Manufacturing method of shaft lever part for engineering machinery

A manufacturing method and technology of construction machinery, applied in the direction of mechanical equipment, process efficiency improvement, shaft, etc., can solve the problems of low cost performance and defects of shaft parts, and achieve the effect of small deformation and strong abrasive wear resistance

Inactive Publication Date: 2013-01-30
YANTAI SHOUGANG DONGXING GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the principle of tribology, it can be seen that for products mainly based on abrasive wear, the surface hardness of the parts, the effective hardened layer depth and the type of hardness change curve are the main factors affecting the service life of shaft parts, and the single pursuit of deep effective hardened layer depth , it may reduce the cost performance of shaft parts, and at the same time, the tendency to produce defects is greater

Method used

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  • Manufacturing method of shaft lever part for engineering machinery
  • Manufacturing method of shaft lever part for engineering machinery
  • Manufacturing method of shaft lever part for engineering machinery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, a manufacturing method of shaft rod parts for construction machinery:

[0029] 1. Cutting;

[0030] 2. Quenching and tempering heat treatment process, heating the workpiece to 830°C, calculating the holding time according to the diameter of the workpiece, the holding time is 1min / mm, and quenching with 8%-12% by mass of brine. When the shaking of the workpiece in the water stops, the water can be cooled by air. Then temper at 560°C for 3 hours, and air cool to room temperature;

[0031] 3. Rough turning, turned into a shaft with a radius of 17.5mm on a lathe;

[0032] 4. Surface induction hardening process, power: 70KW, workpiece moving speed: 70mm / min, water pressure: 0.1MPa, current: 300A, voltage: 400V, frequency: 1000Hz;

[0033] 5. Stress-relieving and tempering, heating to 180°C, and holding for 3 hours.

[0034] After the hardness test, the surface hardness is 58HRC, and the depth of the quenching hardened layer is D S 5.25mm, the depth D of th...

Embodiment 2

[0035] Embodiment 2. A manufacturing method of shaft rod parts for engineering machinery:

[0036] 1. Cutting;

[0037] 2. Quenching and tempering heat treatment process, heating the workpiece to 840°C, calculating the holding time according to the diameter of the workpiece, the holding time is 1min / mm, and quenching with 8%-12% by mass of brine. When the shaking of the workpiece in the water stops, the water can be cooled by air. Then temper at 590°C for 3 hours, and air cool to room temperature;

[0038] 3. Rough turning, turned into a shaft with a radius of 50mm on a lathe;

[0039] 4. Surface induction hardening process, power: 110KW, workpiece moving speed: 200mm / min, water pressure: 0.15MPa, current: 360A, voltage: 460V, frequency: 1800Hz;

[0040] 5. Stress-relief tempering, heating to 200°C, and holding for 3 hours.

[0041] After the hardness test, the surface hardness is 56HRC, and the depth of the quenching hardened layer is D S 15mm, the depth D of the quench ...

Embodiment 3

[0042] Embodiment 3, a kind of manufacturing method of shaft rod type parts for engineering machinery:

[0043] 1. Cutting;

[0044] 2. Quenching and tempering heat treatment process, heating the workpiece to 860°C, calculating the holding time according to the diameter of the workpiece, the holding time is 1min / mm, and quenching with 8%-12% by mass of brine. When the shaking of the workpiece in the water stops, the water can be cooled by air. Then temper at 610°C for 3 hours, and air cool to room temperature;

[0045] 3. Rough turning, turned into a shaft with a radius of 70mm on a lathe;

[0046] 4. Surface induction hardening process, power: 160KW, workpiece moving speed: 400mm / min, water pressure: 0.20MPa, current: 430A, voltage: 480V, frequency: 2400Hz;

[0047] 5. Stress-relieving and tempering, heating to 230°C, and holding for 3 hours.

[0048] After the hardness test, the surface hardness is 55HRC, and the depth of the quenching hardened layer is D S 21.7mm, the ...

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Abstract

The invention relates to a shaft lever part for engineering machinery, comprising a core, a quench hardening layer and an intermediate layer between the quench hardening layer and the core. The surface hardness of the shaft lever part is not less than 50 HRC; the ratio DS / r of the depth DS of the quench hardening layer to the radius r of a shaft lever is 0.28-0.32; and the proportional relation of the depth DS of the quench hardening layer and the width b of the intermediate layer can be expressed as follows: b=(0.382-0.618)DS. The manufacturing method of the shaft lever part for engineering machinery comprises the procedures of tempering and heat treating, rough turning, surface induction quenching and stress-eliminated tempering. The shaft lever part for engineering machinery has strong grain wearing resistance. The ratio of the depth DS of the hardening layer to the radius r of the shaft lever is 0.28-0.32. The shaft lever part for engineering machinery has highest value-added ratio of torsional strength, highest cost performance, smallest residual stress and longer service life.

Description

technical field [0001] The invention relates to related components of engineering machinery, in particular to shaft and rod parts for engineering machinery. Background technique [0002] Shaft parts are the key parts of construction machinery. During the manufacturing process, the stress state on the surface of shaft parts determines the manufacturing quality, and each process in the manufacturing process, especially the heat treatment process, may change the shaft. The magnitude and distribution of stress on a quasi-zero surface. Especially in the shaft parts that require high performance, the zero surface of the shaft has an inherent high stress state. If the stress distribution is unreasonable, it is very easy to induce undesirable defects such as cracks in the subsequent manufacturing process. The main failure mode of shaft parts during use is wear. Since construction machinery including shaft (sleeve) parts are located on the engineering site for a long time, the work...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/25C21D1/10F16C3/02
CPCY02P10/25
Inventor 尹立辉郑伟郭英鉴
Owner YANTAI SHOUGANG DONGXING GRP
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