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Laser cladding method for surface of automobile engine camshaft

A technology of automobile engine and laser cladding, applied in coating, metal material coating process, etc., can solve the combined impact of cam and hydraulic tappet, the increase of clearance between camshaft and bearing seat, and the clearance between driving cam and hydraulic tappet. increase, etc.

Inactive Publication Date: 2014-01-08
JIANGSU YIYU ENERGY SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The abnormal wear of the camshaft will cause the gap between the camshaft and the bearing seat to increase, the axial displacement will occur when the camshaft moves, and the gap between the driving cam and the hydraulic tappet will increase, and the cam and the hydraulic tappet will increase. There will be a bump when combined, resulting in a rattling sound

Method used

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  • Laser cladding method for surface of automobile engine camshaft

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] A method for laser cladding on the surface of a camshaft of an automobile engine comprises the following steps:

[0023] 1) Carry out degreasing and impurity treatment on the surface of camshaft 1 at room temperature;

[0024] 2) Use CNC machine tools as the workbench;

[0025] 3) Prefabricated powder: The selected nickel-based ceramic alloy powder formula contains 16% titanium carbide, 0.6% carbon, 3% calcium fluoride, 4% silicon nitride, 15% chromium, 1.6% silicon, and 5% iron by weight percentage , 17% molybdenum, 0.8% manganese, the balance nickel and 5% indium oxide and rare earth.

[0026] 4) Clamp the camshaft 1 on the workbench and rotate it accordingly. The speed of the workbench is 300r / min, and the high-energy laser beam (that is, the spot) with a diameter of 4mm and an overlap rate of 10% passes through the fiber laser generator Axial movement is synchronized with the robot system to keep the distance from the laser beam to the surface ...

Embodiment 2

[0034] A method for laser cladding on the surface of a camshaft of an automobile engine, comprising the following steps:

[0035] 1) Degreasing the surface of the camshaft at room temperature;

[0036] 2) Use CNC machine tools as the workbench;

[0037] 3) Prefabricated powder: The selected nickel-based ceramic alloy powder formula contains 16% titanium carbide, 0.6% carbon, 3% calcium fluoride, 4% silicon nitride, 15% chromium, 1.6% silicon, and 5% iron by weight percentage , 17% molybdenum, 0.8% manganese, the balance nickel and 5% indium oxide and rare earth.

[0038] 4) Clamp the camshaft 1 on the workbench and rotate it accordingly. The speed of the workbench is 300r / min. The high-energy laser beam (ie, spot) with a diameter of 5mm and an overlap rate of 15% passes through the fiber laser generator Axial movement is synchronized with the robot system to keep the distance from the laser beam to the surface of the camshaft 1 consistent. The angle betwe...

Embodiment 3

[0046] A method for laser cladding on the surface of a camshaft of an automobile engine comprises the following steps:

[0047] 1) Degreasing the surface of the camshaft at room temperature;

[0048] 2) Use CNC machine tools as the workbench;

[0049] 3) Prefabricated powder: The selected nickel-based ceramic alloy powder formula contains 16% titanium carbide, 0.6% carbon, 3% calcium fluoride, 4% silicon nitride, 15% chromium, 1.6% silicon, and 5% iron by weight percentage , 17% molybdenum, 0.8% manganese, the balance nickel and 5% indium oxide and rare earth.

[0050] 4) Clamp the camshaft 1 on the workbench and rotate it accordingly. The speed of the workbench is 400r / min. The high-energy laser beam (ie, spot) with a diameter of 6mm and an overlap rate of 20% passes through the fiber laser generator Axial movement is synchronized with the robot system to keep the distance from the laser beam to the surface of the camshaft 1 consistent. The angle between the la...

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Abstract

The invention discloses a laser cladding method for the surface of an automobile engine camshaft. The method comprises the following steps: 1) cladding blended nickel-based ceramal powder on the surface of a camshaft in a synchronous powder feeding manner, allowing the powder and the surface of the camshaft to fuse at the same time through laser beam scanning and subjecting a mixed liquid alloy to rapid solidification through air cooling at room temperature so as to form an alloy cladding layer; and 2) allowing the surface of the cladding layer to meet requirements on assembling and working of the camshaft by using a machining manner. The method has the following advantages: 1) the surface of the camshaft has improved strength, wear resistance, high temperature resistance and corrosion resistance after cladding; 2) the cladding layer has small deformation, a compact structure, few microdefects, high bonding strength and a low rate of dilution to the surface of the camshaft; 3) the size and the position of the cladding layer can be accurately controlled, and components of the cladding layer can be conveniently adjusted according to demands of working conditions; and 4) the service life of the camshaft is prolonged, the integral performance of an engine is improved, and maintenance cost is saved.

Description

technical field [0001] The invention belongs to the technical field of laser cladding, in particular to a method for laser cladding on the surface of a camshaft of an automobile engine. Background technique [0002] A camshaft refers to a shaft equipped with one or more cams, and the main body of the camshaft is a cylindrical rod with the same length as the cylinder group. Several cams are set on it for driving valves. One end of the camshaft is the bearing support point, and the other end is connected with the drive wheel. According to the number of camshafts, it can be divided into two types: single overhead camshaft (SOHC) and double overhead camshaft (DOHC). The camshaft is usually paired with the valve rocker arm in the car engine to control the switch of the engine valve. It is the friction part with the largest load on the engine. The hardness of the camshaft lobe and the depth of the white layer are the key to determining the service life of the camshaft and engine...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C19/05C22C32/00C22C30/00
Inventor 钱志强季永清
Owner JIANGSU YIYU ENERGY SCI & TECH DEV
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