Zinc-plated steel sheet and method for preparation thereof, and method for manufacturing formed article by press working

A technology of galvanized steel sheet and manufacturing method, which is applied in the field of stamping and formed products manufacturing, and can solve problems such as difficulty in obtaining surface roughness, difficulty, and microscopic concave-convex shape changes on the surface of galvanized steel sheet

Inactive Publication Date: 2003-01-29
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the above-mentioned various roll surface processing methods are used to increase the surface roughness of the roll, the peak number PPI will be reduced, and it is difficult to increase both the average roughness Ra and the peak number PPI.
[0021] When such a galvanized steel sheet is used for press forming, the performance of retaining lubricating oil between the press dies is insufficient, the sliding resistance becomes large, and there is a problem that the steel plate on the punch surface or the steel plate near the rib of the die is easily damaged.
[0022] The second problem is that due to the biting of the roll during leveling, the contact pressure between the roll and the steel plate is very large, and the microscopic unevenness (surface roughness) on the surface of the roll will change with time due to wear, and the microscopic unevenness copied to the surface of the steel plate It is difficult to maintain a fixed app

Method used

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  • Zinc-plated steel sheet and method for preparation thereof, and method for manufacturing formed article by press working
  • Zinc-plated steel sheet and method for preparation thereof, and method for manufacturing formed article by press working
  • Zinc-plated steel sheet and method for preparation thereof, and method for manufacturing formed article by press working

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0137] The object of Embodiment 1 is to provide a method of manufacturing a galvanized steel sheet suitable for press forming, capable of forming denser surface microscopic unevenness than a galvanized steel sheet obtained by a smoothing method. Specifically, the purpose is to provide a method for producing a galvanized steel sheet that has a relatively large average roughness Ra on the surface, achieves a high number of peaks and reduces long-term unevenness, and has an excellent color brightness after coating. The purpose of the present invention is also to reduce the frequent roll change in the smoothing method, which is a problem in the smoothing method, improve productivity, and at the same time form a method for generating new surfaces that expands the adjustment range of surface roughness.

[0138] Embodiment 1-1 is a method of manufacturing a galvanized steel sheet excellent in press formability, characterized by including a step of projecting solid particles onto the s...

Embodiment 1

[0227] Using the first embodiment of the present invention, it shows that the surface morphology formed by projecting solid particles onto the surface of the galvanized steel sheet is very different from that formed by the prior art, and the adjustment range can also be expanded.

[0228] In the present embodiment, the galvanized steel sheet used is a cold-rolled steel sheet with a thickness of 0.8mm, and the coating structure is 70g / m2 with a single-side coating amount composed of η phase 2 hot-dip galvanized steel.

[0229] The hot-dip galvanized steel plate is flattened with an elongation rate of 0.8%, in order to adjust the mechanical properties. For leveling, a bright roll with an average roll surface roughness Ra of 0.28 μm was used. The surface average roughness Ra, peak number PPI, and waviness Wca of the flattened galvanized steel sheet are 0.25 μm, 48, and 0.3 μm, respectively.

[0230] In the present embodiment, to the galvanized steel sheet surface after smoothin...

Embodiment 2

[0242] The second example of the present invention is to explain the results of a flat plate sliding test in order to evaluate the press forming performance of a galvanized steel sheet whose surface morphology was adjusted by projecting solid particles.

[0243] Using the method shown in Example 1, three kinds of solid particles A1, B1, and D2 were used to adjust the surface morphology of the galvanized steel sheet. The galvanized steel sheet used was the same as in Example 1. In addition, as a comparative example, the galvanized steel sheet using the prior art shown in Example 1 was used for a flat plate sliding test.

[0244] The flat plate sliding test is a test method of sliding between the galvanized steel plate and the pressure plate by moving the slide plate while pushing the pressure plate tool with a certain pushing load on the surface of the galvanized steel plate fixed to the slide plate. At this time, when the slider is moved, the pressing load of the pressure pla...

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Abstract

The method for manufacturing galvanized steel sheet has a step of adjusting the surface texture thereof by blasting solid particles against the surface thereof. The surface texture is defined by at least one parameter selected from the group of parameters consisting of mean roughness Ra on the surface of steel sheet, peak count PPI on the surface of steel sheet, and filtered centerline waviness Wca on the surface of steel sheet. The galvanized steel sheet has a surface in dimple-pattern texture.

Description

technical field [0001] The present invention relates to a galvanized steel sheet, a method for manufacturing it, and a method for manufacturing a press-formed product. Background technique [0002] The demand for thin steel sheets with excellent antirust performance for automobiles, home appliances, and building materials is increasing. The surface of the galvanized steel sheet used for stamping needs to have appropriate micro-concave-convex roughness. This is because the microscopic unevenness on the surface of the steel plate can improve the performance of storing lubricating oil between the stamping dies, reduce the sliding resistance, and at the same time have the effect of preventing die sticking. [0003] The average roughness Ra specified in JISB0601 is generally used as an index indicating the microscopic concave-convex shape of the steel plate surface. For galvanized steel sheets used for stamping, generally the value of the average roughness Ra should be adjusted...

Claims

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Application Information

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IPC IPC(8): B24C1/06B24C1/10B24C3/12C23C2/26
CPCY10T428/12799B24C3/12B24C1/086C23C22/78B24C1/10C23C2/26B24C1/06Y10T428/12611Y10T428/12993C23C2/265C23C2/024C23C2/02C23C2/022B05D3/12C23C2/06
Inventor 曾谷保博木村幸雄植野雅康富田省吾野吕寿人佐藤馨杉本芳春安藤聪多田雅毅稻垣淳一山下正明山崎雄司
Owner JFE STEEL CORP
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