Manufacturing method of strengthened valve tappet

A technology of phosphating treatment and laser heat treatment, which is applied in the direction of coating and metal material coating process, can solve the problems of limited improvement and achieve the effects of eliminating pores, good wear resistance and high hardness

Active Publication Date: 2015-08-26
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modification of the tappet surface disclosed by the above two patents can improve the wear resistance and hardness of the tappet, but the degree of improvement is limited

Method used

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  • Manufacturing method of strengthened valve tappet
  • Manufacturing method of strengthened valve tappet
  • Manufacturing method of strengthened valve tappet

Examples

Experimental program
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Effect test

preparation example Construction

[0032] The embodiment of the present invention discloses a method for preparing a reinforced tappet, comprising the following steps:

[0033] Clean the working surface of the tappet, and carry out phosphating treatment on the working surface of the tappet after cleaning;

[0034] The working surface of the phosphating tappet is subjected to laser heat treatment to obtain a strengthened tappet;

[0035] The laser heat treatment is laser quenching treatment, laser remelting treatment or laser cladding treatment;

[0036] The laser power of the laser quenching treatment is 1000-3000W, the spot diameter is 1.0-5.0mm, the scanning speed is 500-1500mm / min, and the overlap rate is 20%-50%;

[0037] The laser power of the laser remelting treatment is 1500-3500W, the spot diameter is 1.0-5.0mm, the scanning speed is 100-1000mm / min, and the overlapping rate is 20%-50%;

[0038] The laser power of the laser cladding treatment is 1500-3500W, the spot diameter is 1.0-5.0mm, the scanning ...

Embodiment 1

[0065] The bottom surface of the 45 steel tappets to be treated is cleaned and pretreated with alcohol to remove surface oil; the pretreated bottom surface of the tappets is phosphated, and the bottom surface of the tappets is immersed in the phosphating solution for 5 to 10 minutes, and the residual liquid on the surface is washed with water , dry or wipe the surface with a dry cloth;

[0066] Laser quenching treatment is carried out on the bottom surface of the tappet after phosphating treatment, and the parameters of the laser quenching treatment are shown in Table 1;

[0067] The laser-strengthened tappet can be obtained by fine grinding the bottom surface of the tappet after laser quenching treatment.

[0068] The performance of the tappet prepared in this example was tested, and the results are shown in Table 3. During the adhesive wear test on the surface of the tappet, the load was 200N and the duration was 1h, so as to measure the wear quality of the tappet. figure ...

Embodiment 2

[0070] The bottom surface of the 45 steel tappet to be treated is cleaned and pretreated with acetone to remove surface oil; the pretreated bottom surface of the tappet is phosphated, and the bottom surface of the tappet is immersed in the phosphating solution for 5 to 10 minutes, and the residual liquid on the surface is washed with water , dry or wipe the surface with a dry cloth;

[0071] Laser quenching treatment is carried out on the bottom surface of the tappet after phosphating treatment, and the parameters of the laser quenching treatment are shown in Table 1;

[0072] The laser-strengthened tappet can be obtained by fine grinding the bottom surface of the tappet after laser quenching treatment.

[0073] The performance of the tappet prepared in this embodiment was tested, and the results are shown in Table 3.

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Abstract

The invention provides a manufacturing method of a strengthened valve tappet. The method comprises the following steps that the bottom face of the valve tappet is cleaned, and phosphating is carried out on the cleaned bottom face of the valve tappet; laser heat treatment is carried out on the phosphated bottom face of the valve tappet to obtain the strengthened valve tappet; and the laser heat treatment is laser quenching treatment or laser remelting treatment or laser fusion covering treatment. The laser surface modification technology that is the laser quenching method or the laser remelting method or the laser fusion covering method is adopted to strengthen the bottom working face of the valve tappet, and parameter adjustment in the laser surface modification technology is adjusted, so that the hardness and the wear resistance of the treated valve tappet are greatly improved.

Description

technical field [0001] The invention relates to the technical field of material surface modification, in particular to a preparation method of a reinforced tappet. Background technique [0002] In a four-stroke internal combustion engine, the position of the camshaft can be divided into three types: top, middle and bottom. In both mid-mounted and down-mounted engines, the valve lifter body needs to be configured. The tappet is the follower of the cam, which transmits the motion and force from the cam to the push rod or valve, and at the same time bears the lateral force exerted by the cam and transmits it to the body or cylinder head. [0003] Its bottom surface of tappet contacts with cam during work, and because contact area is little, contact stress is bigger, so the bottom surface friction of tappet and wearing and tearing are all quite serious. Therefore, the tappet working surface should have wear resistance and good lubricity. [0004] The Chinese patent applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C21D1/09C23C22/07C22C38/56C22C38/46
Inventor 李丙超王慧芹周龙徐继东
Owner WEICHAI POWER CO LTD
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