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Abstract
As to the horizontal stripes defect which exist on the surface of the high-grade automotive panels in continuous annealing process, an effective comprehensive control method is proposed on the basis of full consideration of the equipment and technological features of continuous annealing line. With five field tests as basis, the generation mechanism of the defect was analysised in detail and the comprehensive control measures were put forward. According to actual situation, a detailed technical plan was worked out .Then the relevant technologies were applied to a 1850 continuous annealing line. The statistics shows that this program acquired good effects. The incidence of horizontal stripes defect decreased from 100% to 2.78%. Meanwhile, the surface quality of strip also improved effectively, which created a larger economic benefit.
Highlights
Annealing plays an important role in the production of automotive panels
As long as the strip running to the furnace roller A and vibrating simultaneously, the two will beat each other and dominant or hidden horizontal stripes will appear on the strip surface
In premise of that mainly sources have been removed, with the production progress and the contact between strip and furnace rollers, the horizontal stripes of furnace rollers will disappear after a long-term friction, which makes the horizontal stripes defect become more and more slight and disappear eventually. 2) to the horizontal stripes defect caused by the furnace roller A and its downstream furnace rollers, the severity of them and the spacing of stripes have nothing with the temper rolling speed and the annealing speed
Summary
Annealing plays an important role in the production of automotive panels. The intermittent hood-type annealing was mainly used initially. Panels, the horizontal stripes defect on strip surface always is a “bottleneck” which confines the improvement of quality of the automotive panels. 2. Introduction to the Horizontal Stripes Defect on Strip Steel and the Formulation of the Grading Standards (a) Schematic diagram of waved-shape stripes. To the panels after continuous annealing process, the horizontal stripes defect is refer to the light and dark, drumshaped or wave-shaped stripes which appear on the strip surface and only can be seen after grind by oilstone (Figure 1). These stripes arise from the continuous annealing furnace. This is different from vibration fringes which come from temper rolling process
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