Method for preventing press-in of hot spray printing coating particles through constant steel plate surface height

A technology of surface height and steel plate, which is applied in the field of eliminating the defects of coating particles in the thick steel plate thermal spray printing machine, can solve the problems of steel plate coating particle pressing defects, high spray pressure of paint, and incomplete printing of characters, etc., to achieve the elimination of heat The effect of inkjet printing machine paint particles pressing into defects, reducing waste loss, and clearly printing characters

Inactive Publication Date: 2020-06-09
BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current problem of the prior art method lies in the dispersion of paint particles, and these dispersed paint particles have a certain viscosity and are more easily bonded to high-temperature steel plates. In the subsequent work in the finishing area, they will be pinched by the shear line Pressing in by shearing machines, etc., causing defects in steel plate coating particles
As the thickness of the steel plate changes, especially when encountering a steel plate with an extreme thickness (the thickness of the steel plate is less than 8mm or greater than 40mm), there will be incomplete character printing, and some spray printing particles will be sprayed outside, and the particle dispersion rate will increase to 20%. Self-contained compressed air blowing, still causes spray printing particles on the steel plate to remain
And because the surface of the 5-8mm thin-gauge steel plate is far away from the nozzle of the inkjet printer, the coating spreading area increases sharply, resulting in the formation of coating particles scattered outside the characters, and the thick-gauge steel plate has a slow temperature drop and high surface temperature, resulting in partial coating The water loses quickly to form particles, and the distance from the nozzle is close, the paint injection pressure is relatively high, and the particles are scattered outside the characters under the action of air pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Steel type: Q345D, billet size: 227×1500×3168mm, finished product size 9.98×2443×44251mm. After straightening by the thermal straightening machine, the overall unevenness of the steel plate is controlled at 1mm / m, the characters of the spray printing are clear, and the particle dispersion rate is 6%.

Embodiment 2

[0015] Steel type: Q420qD-Z15, blank size: 227×1745×3716mm, finished product size 55.4×2387×11018mm. After straightening by the thermal straightening machine, the overall unevenness of the steel plate is controlled at 0.7mm / m, the characters of the spray printing are clear, and the particle dispersion rate is 5%.

Embodiment 3

[0017] Steel type: SS400, blank size: 227×2280×3463mm, finished product size 24.32×2837×25651mm. After straightening by the thermal straightening machine, the overall unevenness of the steel plate is controlled at 0.6mm / m, the characters of the spray printing are clear, and the particle dispersion rate is 5%.

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PUM

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Abstract

The invention relates to a quality control technology of thick steel plate hot spray printing machines, in particular to a method for eliminating the coating particle press-in defect of a thick steelplate hot spray printing machine. Through modification of a nozzle support, modification of a spray printing machine program and transmission of spray printing height data, clear spray printing characters and few scattered particles can be obtained, spray printing particle press-in defects on the surface of a steel plate are effectively reduced, the waste and rejection rate and the loss are reduced, the scattering rate of spray printing particles is controlled below 8%, the scattered particles of a coating of the spray printing machine are effectively controlled through a compressed air purging device arranged on the spray printing machine, and the coating particle press-in defect of the hot spray printing machine in a thick plate finishing area is eliminated.

Description

technical field [0001] The invention relates to the quality control technology of thermal jet printers for thick steel plates, in particular to eliminating the defect of paint particles being pressed into thermal spray printers for thick steel plates. Background technique [0002] In the production of thick plates, in order to distinguish the identity of each steel plate, and because the steel plate is terminated at a rolling temperature of 700-1000 degrees, a thermal spray printer is generally used to mark the steel plate. Large character jet printers with a printing height ranging from 5 to 67 mm. Its working principle is "spray dots on demand". This kind of character jet printers is widely used in a series of industrial fields. Use the type of paint with high temperature resistance and suitable viscosity to ensure clear printing characters and beautiful icons. At present, Zhanjiang Iron and Steel's 4200mm thick plate factory prints a single character at 70*140mm. The pr...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B41M5/00
CPCB41M5/0023B41M5/0047B41M5/0058
Inventor林剑陈建恩李伟李孟礼
OwnerBAOSTEEL ZHANJIANG IRON & STEEL CO LTD