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Surface micro-melting treated cylinder jacket and preparation method thereof

A cylinder liner and micro-melting technology, applied in the field of cylinder liner, can solve the problems of high production scrap rate, limitation, high requirements for electroplating production line and tooling, and achieve high hardness and prevent cavitation.

Inactive Publication Date: 2015-09-16
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Serious cavitation caused by "cavitation corrosion" at the contact part between the outer circle and the cooling water when the cylinder liner is working; cavitation can cause destructive honeycomb pits on the outer surface of the cylinder liner, and even form holes through the cylinder wall , leading to cylinder liner failure
[0003] In order to prevent cavitation failure of the cylinder liner, an electrochrome plating layer can be used on the outer surface of the cylinder liner, but the electrochrome plating process is seriously polluted, and the requirements for the electroplating production line and tooling are high, and the production scrap rate is also high, so the application is limited

Method used

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  • Surface micro-melting treated cylinder jacket and preparation method thereof

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Effect test

Embodiment 1

[0014] A method for surface micro-melting treatment of cylinder liners, which uses a laser beam (6KW cross-flow carbon dioxide laser, spot diameter 3mm, power 1.5KW, scanning pitch: 2.5mm) to scan the outer surface of the gray cast iron cylinder liner, and control The power density of the laser beam is 21KW / cm 2 , The scanning speed is 33mm / s, and after the scanning is finished, it is naturally cooled to room temperature.

[0015] Specifically, the material of the finished cylinder liner includes, but is not limited to, gray cast iron, compacted graphite iron, or nodular cast iron.

[0016] The cylinder liner prepared by the above method has a ledeburite structure on the outer surface, the depth of the hardened layer is 0.5-0.6mm, and the hardness is 50HRC.

Embodiment 2

[0018] A method for surface micro-melting treatment of cylinder liners, which uses a laser beam (6KW cross-flow carbon dioxide laser, spot diameter 3mm, power 1KW, scanning pitch: 2.2mm) to scan the outer surface of the finished vermicular graphite cast iron cylinder liner, and control The power density of the laser beam is 14.5KW / cm 2 , The scanning speed is 33mm / s, and after the scanning is finished, it is naturally cooled to room temperature.

[0019] The cylinder liner prepared by the above method has a ledeburite structure on the outer surface, the depth of the hardened layer is 0.45-0.48mm, and the hardness is 49HRC.

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Abstract

The invention belongs to the technical field of cylinder jackets and specifically relates to a method for treating a cylinder jacket by virtue of surface micro-melting. According to the method, the outer circular surface of the cylinder jacket finished product is scanned by use of a laser beam or a plasma beam; the power density of the laser beam or the plasma beam is within the range of 14.5-21KW / cm2, and the scanning speed is within the range of 28-36mm / s; after finishing scanning, the temperature is just reduced to the room temperature by virtue of natural cooling. The outer circular surface of the cylinder sleeve finished product is most of a perlite structure having the hardness of 220-260HB; after the micro-melting treatment, the surface is formed into a ledeburite structure or mixed ledeburite and trace martensite structures, and the hardness of the surface is remarkably improved and can be within the range of 470-480HB (approximately above 49HRC).

Description

technical field [0001] The invention belongs to the technical field of cylinder liners, and in particular relates to a surface micro-melting treatment cylinder liner and a preparation method thereof. Background technique [0002] Serious cavitation caused by "cavitation corrosion" at the contact part between the outer circle and the cooling water when the cylinder liner is working; cavitation can cause destructive honeycomb pits on the outer surface of the cylinder liner, and even form holes through the cylinder wall , leading to cylinder liner failure. [0003] In order to prevent cavitation failure of the cylinder liner, an electrochrome plating layer can be used on the outer surface of the cylinder liner, but the electrochrome plating process is seriously polluted, and the requirements for the electroplating production line and tooling are high, and the production scrap rate is also high, so the application is limited. Contents of the invention [0004] The purpose of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/09C21D5/00
Inventor 徐超赵记霞张亮亮刘栋
Owner ZYNP GRP
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