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Engine tappet and preparation method thereof

An engine and column core technology, which is applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve problems such as low production efficiency, low coating bonding strength, and demanding production equipment

Active Publication Date: 2018-02-27
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At present, the surface coating technology of metal 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 methods , there are deficiencies such as demanding production equipment, low production efficiency, and low coating bonding strength

Method used

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  • Engine tappet and preparation method thereof
  • Engine tappet and preparation method thereof
  • Engine tappet and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Embodiment 1: the preparation method of engine tappet, comprises the steps:

[0072] 1. First prepare a titanium plate 2, wherein the purity of titanium should be controlled at 99.7%. The titanium plate 2 should be surface treated first, the steps are as follows:

[0073] In the first step of pickling, choose 300mL / L hydrochloric acid, and then rinse with running water;

[0074] In the second step of pickling, choose 300mL / L hydrofluoric acid, and then rinse with running water;

[0075] The third step is surface grinding, using 800 mesh Al 2 o 3 Sandpaper and finally ultrasonic cleaning with alcohol. The thickness of the titanium plate 2 is controlled at 1 mm.

[0076] 2. According to the size of the engine tappet, make the engine tappet lost foam 9 with polystyrene foam.

[0077] 3. According to the size of the engine tappet, use CO 2 Water glass hardened sand is used to make sand mold 7, one engine tappet for each case, and two cases for classification. Accord...

Embodiment 2

[0086] Embodiment 2: the preparation method of engine tappet, comprises the steps:

[0087] 1. Prepare a titanium plate 2 first, wherein the purity of titanium should be controlled at 99.8%. The titanium plate 2 should be surface treated first, and the steps are as follows:

[0088] The first step is pickling, 60mL / L phosphoric acid, and then rinse with running water;

[0089] The second step is pickling, 200mL / L sulfuric acid, and then rinse with running water;

[0090] The third step is surface grinding, using 1000 mesh Al 2 o 3 Sandpaper and finally ultrasonic cleaning with alcohol. The thickness of the titanium plate 2 is controlled at 1.5mm.

[0091] 2. According to the size of the engine tappet, make the engine tappet lost foam 9 with polystyrene foam.

[0092] 3. According to the size of the engine tappet, make sand mold 7 with coated sand, one engine tappet for each box, and two boxes for classification. According to the working force of the engine tappet, the mai...

Embodiment 3

[0101] Embodiment 3: the preparation method of engine tappet, comprises the steps:

[0102] 1. First prepare a titanium plate 2, wherein the purity of titanium should be controlled at 99.8%. The titanium plate 2 should be surface treated first, the steps are as follows:

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

[0104] The second step is pickling, 240mL / L hydrogen peroxide, and then rinse with running water;

[0105] The third step is surface grinding, using 1000 mesh Al 2 o 3 Sandpaper and finally ultrasonic cleaning with alcohol. The thickness of the titanium plate 2 is controlled at 2.5mm.

[0106] 2. According to the size of the engine tappet, make the engine tappet lost foam 9 with polystyrene foam.

[0107] 3. According to the size of the engine tappet, make sand mold 7 with self-hardening resin sand, one engine tappet for each box, and two boxes for type. According to the working force of the engine tappet,...

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Abstract

The invention discloses an engine tappet. The inner cavity surface of the engine tappet is provided with a carbide coating, the body of the engine tappet is made of carbon steel. The invention also provides a production method of the engine tappet. The production method comprises the following steps: fixing an external carbon source to the outer wall of the core of the engine tappet, winding a titanium plate to be close to graphite paper at the outer wall of the core of the austenitic stainless steel engine tappet, casting molten carbon steel matrix steel in a sand mold, carrying out heat treatment on the cast engine tappet, carrying out furnace cooling to room temperature, and forming the carbide coating on the inner cavity surface of the engine tappet. The matrix of the engine tappet body is also the carbon steel matrix, and the carbide coating includes a quasi monocrystalline TiC ceramic layer, and further comprises a micrometer TiC dense ceramic layer and a TiC-matrix fusion layer. The carbide coating and the matrix are metallurgically bonded, and the bonding force is strong, so the problems of weak bonding force between present hard particles and the metal matrix, and easy shedding of the particles are overcome, and the wear resistance of the work surface of the engine tappet is greatly improved.

Description

technical field [0001] The invention relates to a composite engine tappet with a wear-resistant coating and a preparation method thereof, in particular to a composite engine tappet with a wear-resistant carbide coating and a preparation method thereof, in particular to a tappet applied to a carbon steel surface A wear-resistant carbide-coated composite engine tappet and a preparation method thereof. Background technique [0002] The tappet is the main component of the gas distribution mechanism widely used in the heart parts of engines such as automobiles, construction machinery, and tractors. One end of the tappet is in contact with the cam, and the other end is in contact with the valve. Its function is to transmit the thrust of the cam to the valve. Due to the high-speed operation of the engine and the impact and wear of the camshaft, the bottom surface of the tappet (the contact surface with the camshaft) is required to have high hardness and high wear resistance. With...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22D18/06B22D19/00C23C8/64F01L1/16
CPCB22C9/04B22D18/06B22D19/00C23C8/64F01L1/16
Inventor 许云华赵娜娜卢正欣钟黎声梁淑华燕映霖叶芳霞王娟邹军涛肖鹏
Owner XIAN UNIV OF TECH