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Method for working ball cap convex on roll surface by laser

A roll surface and laser processing technology, which is applied in the field of mechanical processing, can solve the problems that it is difficult to adapt to the roughening requirements of rolling high-quality steel plates, cannot accurately control the shape and roughness of the roll surface, and cannot form a convergent oil wedge effect. Achieve good adhesion and appearance quality, good microscopic image clarity, prevent scratches and adhesion effects

Inactive Publication Date: 2002-07-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early 1970s, the roll was texturized by blasting the surface into countless small pits. Since the shot peening process is to adjust the grain size of the sand shot and the blasting time to adjust the texturing degree, it is impossible to accurately control the surface of the roll. shape and roughness, it is difficult to adapt to the roll texturization requirements of rolling high-quality steel plates, and the environmental pollution is serious
This ring-shaped depression can play a certain role in oil storage, cooling and chip holding, so it has a certain effect of lubrication and anti-scratch in the stamping process of the steel plate, but the ring-shaped depression has a certain effect in the stamping process of the plate. The formed fluid film lubrication method cannot form a convergent oil wedge effect, and is prone to interference light patterns

Method used

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  • Method for working ball cap convex on roll surface by laser
  • Method for working ball cap convex on roll surface by laser
  • Method for working ball cap convex on roll surface by laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Laser texturing of high-carbon chromium bearing steel GCr15 roll sample The sample is cylindrical, with a diameter of 17 mm and a thickness of 6 mm. The material is GCr15, and the specific chemical composition is shown in Table 1. After overall quenching, the surface hardness reaches HV 935, and the surface roughness after grinding is Ra=0.04μm.

[0021] Table 1 Chemical composition of GCr15

[0022] Chemical composition (%) GCr15 C: 0.95~1.05, Mn: 0.25~0.45, Si: 0.15~0.35, P: ≤

[0023] 0.025, S: ≤0.025, Cr: 1.40~1.65

[0024] The specific processing steps are as follows:

[0025] (1) Use a pulsed Nd:YAG laser with a wavelength of 1.06 μm to roughen the roll, and install the roll sample to be processed on the work table;

[0026] (2) Select laser single pulse energy as 25J, pulse width as 0.5ms, and modify the laser pulse waveform;

[0027] (3) Adjust the focus position to the top of the roll surf...

Embodiment 2

[0034]The laser textured sample of the high-carbon chromium bearing steel GCr15 roll sample is cylindrical, with a diameter of 17mm and a thickness of 6mm. The material is GCr15, and the specific chemical composition is shown in Table 1. After overall quenching, the surface hardness reaches HV 935, and the surface roughness after grinding is Ra=0.04μm.

[0035] The specific processing steps are as follows:

[0036] (1) Use a pulsed Nd:YAG laser with a wavelength of 1.06 μm to roughen the roll, and install the roll sample to be processed on the work table;

[0037] (2) Choose laser single pulse energy as 5J, pulse width as 0.05ms, and carry out the laser pulse waveform as follows image 3 The reshaping treatment shown;

[0038] (3) Adjust the focus position to the top of the roll surface, so that the laser beam is defocused and irradiated on the roll surface, and the defocus amount is 0.5 mm;

[0039] (4) Choose pulse frequency 100Hz, laser scanning speed 50mm / s;

[0040] (...

Embodiment 3

[0044] The laser textured sample of the high-carbon chromium bearing steel GCr15 roll sample is cylindrical, with a diameter of 17mm and a thickness of 6mm. The material is GCr15, and the specific chemical composition is shown in Table 1. After overall quenching, the surface hardness reaches HV 935, and the surface roughness after grinding is Ra=0.04μm.

[0045] The specific processing steps are as follows:

[0046] (1) Use a pulsed Nd:YAG laser with a wavelength of 1.06 μm to roughen the roll, and install the roll sample to be processed on the work table;

[0047] (2) Choose laser single pulse energy as 100J, pulse width as 5ms, and carry out the laser pulse waveform as follows image 3 The reshaping treatment shown;

[0048] (3) Adjust the focus position to the top of the roll surface, so that the laser beam is defocused and irradiated on the roll surface, and the defocus amount is 3.9mm;

[0049] (4) Choose pulse frequency 50Hz, laser scanning speed 25mm / s;

[0050] (5)...

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Abstract

The present invention relates to a method using laser technology to process roll surface which can be used for cold-rolling thin sheet steel surface. Said invention uses proper laser single-pulser energy, and pulse width to make laser beam irradiate surface of roll according to a certain quantity out-of-focus in the course of processing roll by using laser, under the condition of proper pulse frequency and laser scanning speed said invention utilizes protective gas and side-blow melting bath according to a certain angle so as to obtain spherical coronal microconvex from on the surface of roll. Said roll surface processed by said invented laser technology can make coll-rolled thin-sheet steel (strip) surface from uniqu microhole lubricating structure so as to effectively reduce friction and wear-and-tear.

Description

technical field [0001] The invention discloses a method for processing the micro-convex morphology of spherical crowns on the surface of rolls by laser, relating to a laser processing technology for rolls used for surface processing of cold-rolled thin steel plates (strips), and belongs to the technical field of mechanical processing. Background technique [0002] High-quality cold-rolled sheets and strips not only require excellent materials, but also have strict requirements on the surface quality of the sheets, especially the surface micro-morphology, so as to ensure the excellent formability and surface coating performance of the sheets. Texturizing the surface of the sheet (strip) is the main method to improve the surface quality, and the produced textured cold-rolled sheet (strip) is an important raw material for the production needs of automobiles, home appliances, electronics and light industry. [0003] In order to produce high-quality cold-rolled textured sheets, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/14B23K26/352
Inventor 都东何云峰岁波熊丽娟张骅
Owner TSINGHUA UNIV
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