Surface modification treatment method for car inner cylinder

A surface modification and treatment method technology, applied in the field of quenching, can solve the problems of insufficient durable wear resistance, long treatment cycle, unfavorable machining, etc., and achieve the effect of reducing wave, short treatment cycle and reducing high temperature time

Active Publication Date: 2016-12-07
上海朋泰机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Piston inner cylinder is a key component of automobile engine, its structure is as follows figure 1 and figure 2 As shown, the piston inner cylinder includes a cylinder 1 and a cylinder head 2 located in the middle of the cylinder body 1. The center of the cylinder body 1 and the cylinder head 2 is a through hole 3, and the material is 40Cr. The surface of the existing piston inner cylinder is modified The permanent treatment method mainly adopts the steps of quenching and tempering plus nitriding. Among them, the nitriding step needs to be carried out at a high temperature of 500°C for 50 hours. The main disadvantages are: 1. The treatment cycle is long and the energy consumption is relatively large; 2. The hardened layer The depth is shallow (the deepest is 0.5mm), and the durable wear resistance is not enough during use; 3. The overall surface of the part is hardened, which is not conducive to subsequent machining

Method used

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  • Surface modification treatment method for car inner cylinder
  • Surface modification treatment method for car inner cylinder
  • Surface modification treatment method for car inner cylinder

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Experimental program
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Effect test

Embodiment 1

[0022] The frequency of the high-frequency quenching equipment of this embodiment is 250KHz, the anode voltage is 8.1KV±0.1, the anode current is 5.25A±0.25, the grid current is 0.725A±0.025, the downward moving speed is 300mm / min, and the workpiece rotation speed It is 444 revolutions / min.

[0023] The technological process of the surface modification treatment method of the automobile inner cylinder of the present invention includes: centering—opening cooling water—heating—water spray cooling, and the heating and water spray cooling are performed continuously.

[0024] Before quenching, place the workpiece on the upper and lower thimbles of the high-frequency quenching equipment; then select the induction coil that matches the workpiece, and then center a test rod with the same inner diameter as the induction coil so that the workpiece is positioned on the induction coil In the middle of the center, the defects of naked eye alignment can be reduced, and the workpiece can be ...

Embodiment 2

[0027] The frequency of the high-frequency quenching equipment of this embodiment is 250KHz, the anode voltage is 8.1KV±0.1, the anode current is 5.25A±0.25, the grid current is 0.725A±0.025, the downward moving speed is 280mm / min, and the workpiece rotation speed It is 440 rev / min.

[0028] The technological process of the surface modification treatment method of the automobile inner cylinder of the present invention includes: centering—opening cooling water—heating—water spray cooling, and the heating and water spray cooling are performed continuously.

[0029] Before quenching, place the workpiece on the upper and lower thimbles of the high-frequency quenching equipment; then select the induction coil that matches the workpiece, and then center a test rod with the same inner diameter as the induction coil so that the workpiece is positioned on the induction coil In the middle of the center, the defects of naked eye alignment can be reduced, and the workpiece can be prevente...

Embodiment 3

[0032] The frequency of the high-frequency quenching equipment of this embodiment is 250KHz, the anode voltage is 8.1KV±0.1, the anode current is 5.25A±0.25, the grid current is 0.725A±0.025, the downward moving speed is 320mm / min, and the workpiece rotation speed 450 rpm.

[0033] The technological process of the surface modification treatment method of the automobile inner cylinder of the present invention includes: centering—opening cooling water—heating—water spray cooling, and the heating and water spray cooling are performed continuously.

[0034] Before quenching, place the workpiece on the upper and lower thimbles of the high-frequency quenching equipment; then select the induction coil that matches the workpiece, and then center a test rod with the same inner diameter as the induction coil so that the workpiece is positioned on the induction coil In the middle of the center, the defects of naked eye alignment can be reduced, and the workpiece can be prevented from shi...

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Abstract

The invention discloses a surface modification treatment method for a car inner cylinder. The method sequentially comprises the steps of cooling water introduction, heating and cooling. Heating and water spraying cooling are conducted continuously. A cylinder end of the car inner cylinder is subjected to water spraying cooling immediately when being heated to the quenching temperature. According to the method, the cylinder end of the car inner cylinder is centered and continuously heated and cooled simultaneously, so that the whole workpiece is evenly heated and evenly cooled, an obtained product is good in quality, and the defect that in an existing high-frequency quenching process, the hardness of the position, with the thickness being 0.1mm, of the surface of the car inner cylinder workpiece is lower than 55 HRC is overcome. In addition, by the adoption of the surface modification treatment method, machining is convenient, the production cycle is short, and energy consumption is low.

Description

technical field [0001] The invention belongs to the field of quenching, and in particular relates to a surface modification treatment method for an automobile inner cylinder. Background technique [0002] Piston inner cylinder is a key component of automobile engine, its structure is as follows figure 1 and figure 2 As shown, the piston inner cylinder includes a cylinder 1 and a cylinder head 2 located in the middle of the cylinder body 1. The center of the cylinder body 1 and the cylinder head 2 is a through hole 3, and the material is 40Cr. The surface of the existing piston inner cylinder is modified The permanent treatment method mainly adopts the steps of quenching and tempering plus nitriding. Among them, the nitriding step needs to be carried out at a high temperature of 500°C for 50 hours. The main disadvantages are: 1. The treatment cycle is long and the energy consumption is relatively large; 2. The hardened layer The depth is shallow (the deepest is 0.5mm), and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/10C21D1/18
CPCC21D1/10C21D1/18C21D9/0062C21D9/0068Y02P10/25
Inventor 潘诗良
Owner 上海朋泰机械科技有限公司
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