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Engine cam and manufacturing method thereof

An engine and cam technology, applied in cams, mechanical equipment, manufacturing tools, etc., can solve the problems of harsh production equipment, low coating bonding strength, and low production efficiency.

Active Publication Date: 2015-04-22
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the surface coating technology of carbon steel materials includes: laser cladding method, high temperature self-propagating sintering technology, powder metallurgy technology, material vapor deposition technology (including: chemical vapor deposition (CVD), physical vapor deposition (PVD)), etc., but these method, there are disadvantages such as demanding production equipment, low production efficiency, and low coating bonding strength

Method used

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  • Engine cam and manufacturing method thereof
  • Engine cam and manufacturing method thereof
  • Engine cam and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The preparation method of engine cam comprises the steps:

[0070] 1. First prepare a tungsten plate 2, in which the purity of tungsten should be controlled at 99.7%. The tungsten plate 2 should be surface treated first, the steps are as follows:

[0071] The first step is pickling, choose 300ml / L hydrochloric acid, and then rinse with running water;

[0072] In the second step of pickling, choose 300ml / L hydrofluoric acid, and then rinse with running water;

[0073] The third step is to polish the surface, use 800-mesh Al2O3 sandpaper, and finally clean it ultrasonically with alcohol. The thickness of the tungsten plate 2 is controlled at 0.2 mm.

[0074] 2. According to the size of the cam, polystyrene foam is used to make the lost foam of the cam 7. According to the working force of the cam, the main wear is the strong friction between the surface of the cam and the bottom surface of the tappet. Fix the tungsten plate 2, and then fix an external carbon source on ...

Embodiment 2

[0085] The preparation method of engine cam comprises the steps:

[0086] 1. Prepare a tungsten plate 2 first, wherein the purity of tungsten should be controlled at 99.8%. The tungsten plate 2 should be surface treated first, and the steps are as follows:

[0087] The first step is pickling, 60ml / L phosphoric acid, and then rinse with running water;

[0088] The second step is pickling, 200ml / L sulfuric acid, and then rinse with running water;

[0089] The third step is to polish the surface, use 1000-mesh Al2O3 sandpaper, and finally clean it ultrasonically with alcohol. The thickness of the tungsten plate 2 is controlled at 0.8mm.

[0090] 2. According to the size of the cam, polystyrene foam is used to make the lost foam of the cam 7. According to the working force of the cam, the main wear is the strong friction between the surface of the cam and the bottom surface of the tappet. Fix the tungsten plate 2, and then fix an external carbon source on the surface of the tun...

Embodiment 3

[0101] The preparation method of engine cam comprises the steps:

[0102] 1. Prepare a tungsten plate 2 first, in which the purity of tungsten should be controlled at 99.8%. The tungsten plate 2 should be surface treated first, the steps are as follows:

[0103] The first step is pickling, choose 120ml / L hydrogen peroxide, and then rinse with running water;

[0104] In the second step of pickling, choose 240ml / L hydrogen peroxide, and then rinse with running water;

[0105] The third step is to polish the surface, use 1200 mesh Al2O3 sandpaper, and finally clean it ultrasonically with alcohol. The thickness of the tungsten plate 2 is controlled at 1mm.

[0106] 2. According to the size of the cam, polystyrene foam is used to make the lost foam of the cam 7. According to the working force of the cam, the main wear is the strong friction between the surface of the cam and the bottom surface of the tappet. Fix the tungsten plate 2, and then fix an external carbon source on th...

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Abstract

The invention discloses an engine cam with a carbide coating on the surface of a working part, and provides a manufacturing method of the engine cam. The engine cam has a carbide coating on the surface of the working part thereof. A pseudo-single crystal WC compact ceramic layer, a micron WC ceramic layer and a fusion layer of WC and a substrate are in gradient distribution successively from outside to inside, and are applied to the surface of carbon steel. According to the engine cam and the manufacturing method of the present invention, a complex of the substrate and tungsten is obtained by casting, an external carbon source is introduced, and heating and thermal insulation are performed, so that the carbide coating is formed on the surface of the substrate. The coating is in metallurgical binding with the substrate, the binding force is very strong, the problems that the hard particles in the prior art are in non-metallurgical binding with the carbon steel substrate, the binding force is very weak and the particles are easy to fall off are solved, and the wear resistant property of the working surface of the engine cam is greatly increased.

Description

technical field [0001] The invention relates to a composite engine cam with a wear-resistant coating and a preparation method thereof, in particular to a composite engine cam with a wear-resistant carbide coating and a preparation method thereof, in particular to a wear-resistant composite engine cam applied to a carbon steel surface A carbide-coated composite engine cam and a method of making the same. Background technique [0002] The cam is one of the key parts of the car engine, not only bears a certain load, but also suffers from long-term wear and tear, its performance directly affects the quality and life of the car. The cam is an important part of the camshaft. The camshaft is mainly composed of the cam, the supporting journal, and the journal, which are used to control the timely opening and closing of the valves according to a certain working order and gas distribution phase, and to ensure that the valves have sufficient lift. The process has a decisive effect on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/16C21D9/30F16H53/02B32B5/14B22C3/00
CPCB22C3/00B22D19/16C21D9/30F16H53/02
Inventor 许云华赵娜娜梁淑华钟黎声燕映霖叶芳霞王亮亮邹军涛肖鹏
Owner XIAN UNIV OF TECH
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