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Laser phase transition hardening method and bionic camshaft with hard phase prepared by method

A technology of phase transformation strengthening and hard phase, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of inevitable oxidation, decarburization, poor wear resistance, easy cracks, etc., to achieve easy automatic control, improve durability Abrasiveness and small deformation of the workpiece

Active Publication Date: 2017-09-26
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the intermediate frequency quenching process commonly used for cams has the following disadvantages: since intermediate frequency quenching is exposed heating, oxidation and decarburization are unavoidable, low hardness, and poor wear resistance
Although intermediate frequency quenching has the advantage of thicker reinforced layer, it will cause large deformation, which will cause great difficulties to the subsequent process; another negative effect of the thicker intermediate frequency quenched reinforced layer is that the brake camshaft will be quenched after repair, because The quenching layer is not completely removed, resulting in local repeated quenching, which is prone to cracks

Method used

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  • Laser phase transition hardening method and bionic camshaft with hard phase prepared by method
  • Laser phase transition hardening method and bionic camshaft with hard phase prepared by method
  • Laser phase transition hardening method and bionic camshaft with hard phase prepared by method

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Effect test

Embodiment 1

[0035] The brake camshaft of this embodiment is suitable for a tractor that tows or pushes a trailer. The laser strengthening treatment method of the brake camshaft is as follows:

[0036] Step 1: Treat the surface of the workpiece by mechanical processing to meet the use requirements of the surface of the workpiece.

[0037] Step 2. For a light tractor, select the bionic model of the corresponding brake camshaft cam, as shown in Table 1.

[0038] Table 1 The bionic model suitable for light tractor brake camshaft cam

[0039]

[0040] Step 3. According to the bionic model ① and E=P / DV=17.78J / mm 2 For the energy density, the processing parameters are as follows: the circular spot size is D=Φ3mm, the laser power is P=800W, and the scanning speed is V=15mm / s.

[0041] Step 4: Scan the laser beam along the set path on the surface of the workpiece to form a hard phase unit body with stripe-shaped structures uniformly distributed and grain refinement on the surface.

[0042] ...

Embodiment 2

[0044] The brake camshaft of this embodiment is suitable for a tractor that tows or pushes a trailer. The laser strengthening treatment method of the brake camshaft is as follows:

[0045] Step 1: Treat the surface of the workpiece by mechanical processing to meet the use requirements of the surface of the workpiece.

[0046] Step 2. For a medium-sized tractor, select the bionic model of the corresponding brake camshaft cam, as shown in Table 2.

[0047] Table 2 The bionic model of the brake camshaft cam suitable for medium-sized tractors

[0048]

[0049] Step 3. According to the bionic model ② and E=P / DV=18.75J / mm 2 The energy density, the processing parameters adopted are as follows: the circular spot size is D=Φ4mm, the power is P=900W, and the scanning speed is V=12mm / s.

[0050] Step 4: Scan the laser beam along the set path on the surface of the workpiece to form a strip-shaped hard phase unit with uniform distribution and fine grains on the surface.

[0051] The...

Embodiment 3

[0053] The brake camshaft of this embodiment is suitable for a tractor that tows or pushes a trailer. The laser strengthening treatment method of the brake camshaft is as follows:

[0054] Step 1: Treat the surface of the workpiece by mechanical processing to meet the use requirements of the surface of the workpiece.

[0055] Step 2. For heavy-duty tractors, select the bionic model corresponding to the brake camshaft cam, as shown in Table 3.

[0056] Table 3 The bionic model suitable for heavy-duty tractor brake camshaft cams

[0057]

[0058] Step 3. According to the bionic model ③ and E=P / DV=20.00J / mm 2 The energy density, the processing parameters adopted are as follows: the circular spot size is D=Φ5mm, the power is P=1000W, and the scanning speed is V=10mm / s.

[0059] Step 4: Scan the laser beam along the set path on the surface of the workpiece to form a strip-shaped hard phase unit with uniform distribution and fine grains on the surface.

[0060] The above meth...

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Abstract

The invention relates to a laser phase transition hardening method and a bionic camshaft with a hard phase prepared by the method. The laser phase transition hardening method comprises the steps: the surface of a workpiece is scanned by a laser beam with high-energy density, so that the surface temperature of the irradiated material rises to 10-20 DEG C higher than the solidus at high speed, and the surface of the heated area is heated to a semisolid state and then is rapidly cooled by a parent, thus a bionic unit body of which the microstructure is fine martensite is obtained, and the hardness can reach 690-770HV. A wearing surface layer with a soft and hard striped structure can be prepared on the cam surface of the camshaft by the method, and the hardness and the wear resistance of the cam surface are improved. The laser phase transition hardening method has the advantages of simple operation, little workpiece deformation and no defect, is suitable for the strengthening treatment of the camshaft, and is also suitable for the surface strengthening treatment of other workpieces made of 40Cr materials such as gears, sleeves, etc.

Description

technical field [0001] The invention belongs to the technical field of metal component manufacturing and laser strengthening treatment, and in particular relates to a laser phase transformation strengthening method and a bionic camshaft with a hard phase prepared by the method. Background technique [0002] In recent years, with the rapid development of my country's economy, the competition in transportation and construction machinery industry has become more and more fierce. The braking system of transportation machinery and construction machinery is an important part related to personal safety. Especially when the vehicle brakes in complex road conditions such as mountainous areas or in the field, or when it is overloaded and overspeeded at high temperature, the performance requirements for the braking system are getting higher and higher. The vehicle brake is an important part of the vehicle and the key to ensuring driving safety. At present, there are two main types of ...

Claims

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Application Information

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IPC IPC(8): C21D1/09C21D9/30
CPCC21D1/09C21D9/30
Inventor 周宏李慧周倜张鹏袁玉环隋琦冯丽祝子健张海峰张德平苗树森苏威
Owner JILIN UNIV
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