A powder metallurgy automobile engine sprocket lock pin hole laser quenching method

An automobile engine, laser quenching technology, applied in the direction of quenching device, furnace type, furnace, etc., can solve the problems of low quenching hardness, melting of quenching surface, etc., achieve high power density, accelerate quenching cooling speed, high hardness and wear resistance Effect

Active Publication Date: 2018-08-31
XIAN BESAME LASER TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the above-mentioned problems in the background technology, the present invention proposes a powder metallurgy automobile engine sprocket lock pin hole laser quenching method, which not only improves the hardness, wear resistance, fatigue resistance, oxidation resistance and other properties of the workpiece, but also solves the problem of Problems such as low hardness of the lock pin hole induction hardening, melting of the quenching surface, etc.

Method used

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  • A powder metallurgy automobile engine sprocket lock pin hole laser quenching method

Examples

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example 1

[0050] Example 1: Laser quenching of the lock pin hole of a powder metallurgy automobile VVT ​​exhaust sprocket:

[0051] Automobile VVT ​​exhaust sprocket is a powder metallurgy part, its chemical composition is: C 0.70%; Cu 1.50%; Ni1.74%; Mo 0.50%; Fe balance; density 7.0g / cm 3, The heat treatment requirements of the automobile VVT ​​sprocket are: (1) the surface quenching hardness of the lock pin hole is 35-45HRC, (2), the depth of the hardened layer is ≥0.60mm.

[0052] Adjust the angle between the rigid gas delivery pipe and the sprocket plane to 53°, and the distance between the lowest point of the gas outlet and the center of the light spot to be 31mm. Quenching process parameters are: defocus amount +15mm, power 1600w, spot size 2×10mm, gas flow rate 15L / Min, first scan speed 7.0mm / s, second scan speed 10.0mm / s, between two scans pause for 2.5 seconds. After the second scan, the quenching is completed, the workpiece is removed, and the hardness, hardened layer depth...

example 2

[0053] Example 2: Laser quenching of the lock pin hole of a powder metallurgy automobile H02 intake sprocket:

[0054] Automobile H02 intake sprocket is a powder metallurgy part, its chemical composition is: C 0.75%; Cu 1.65%; Ni0.80%; Mo 0.30%; Fe balance; density 6.7g / cm 3 , The heat treatment requirements of the automobile H02 intake sprocket (1) the surface quenching hardness of the lock pin hole is 35 ~ 45HRC, (2), the depth of the hardened layer is ≥ 0.65mm.

[0055] The lock pin hole of the intake sprocket of automobile H02 adopts the laser quenching method of the present invention, the angle between the rigid gas delivery pipe and the sprocket plane is 51°, and the distance between the lowest point of the gas outlet end and the center point of the light spot is 29mm. Quenching process parameters are: defocus amount +10mm, power 1650w, spot size 2×10mm, gas flow rate 18L / Min, first scan speed 8.5mm / s, second scan speed 11.0mm / s, between two scans pause for 3.0 seconds....

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Abstract

The invention belongs to the technical field of surface heat treatment, and particularly relates to a powder metallurgy automobile engine chain wheel lock pin hole laser quenching method. According to the method, the purpose of strengthening a component to be quenched is achieved by adopting gas blowing assistance and two-time un-equal speed scanning laser quenching. The two-time scanning speeds are inconsistent; the first scanning speed is low, the second scanning speed is high, and the power in the overall process is kept consistent; the gas flow is kept unchanged; during a quenching process, the gas is blown to a position of a chain wheel plane quenching light spot at a fixed angle at any time. According to the method, the properties, such as the hardness, the wear resistance, the fatigue resistance and the oxidation resistance, of a workpiece are improved, and the problems of low lock pin hole induction quenching hardness, quenching surface melting and the like are solved.

Description

technical field [0001] The invention belongs to the technical field of surface heat treatment, and in particular relates to a powder metallurgy method for laser quenching of locking pin holes of sprocket wheels of automobile engines. Background technique [0002] The car engine sprocket is an important part of the car engine gas distribution system. The sprocket is connected to the crankshaft and matched with a certain transmission ratio to ensure the amount of intake (exhaust) and the opening and closing time and angle of the valve, so that the incoming air The amount is optimal and the combustion efficiency is improved. The function of the sprocket is to adjust the phase of the engine cam, so that the opening and closing time of the valve changes with the change of the engine speed, so as to improve the charging efficiency and increase the engine power. [0003] During the use of the sprocket of the automobile engine, the working surfaces such as the sprocket teeth and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/09C21D1/74C21D1/62C21D1/18C21D9/00
CPCC21D1/09C21D1/18C21D1/62C21D1/74C21D9/0068
Inventor 王晓飚郭晓军杜超飞姜涵之
Owner XIAN BESAME LASER TECH CO LTD
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