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Method and device for manufacturing outer-plate panel having character line

A manufacturing method and feature line technology, which are applied in the field of manufacturing and manufacturing devices of outer panel panels with feature lines, can solve problems such as errors, and achieve the effects of eliminating line offset, suppressing forming defects, and increasing mold cost

Active Publication Date: 2020-05-26
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is inevitable to contain errors in the inspection of line offset

Method used

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  • Method and device for manufacturing outer-plate panel having character line
  • Method and device for manufacturing outer-plate panel having character line
  • Method and device for manufacturing outer-plate panel having character line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0172] Under the mold conditions listed below and the conditions of Method 1 shown in Table 1, a Figure 11 A and Figure 11 The punch 2 for line shift evaluation shown in B is used for the test material (TS270MPa grade alloyed hot-dip galvanized steel sheet, thickness 0.7mm, length 400mm, width 200mm) using the manufacturing device 1 using method 1 Press forming was performed, and the evaluation parameter S=L×|H| described in Patent Document 1 was used 1 / 3 Quantitative evaluation of line offset was carried out.

[0173] [Mold condition]

[0174] ·BHF 20 tons

[0175] ·Punching speed 10mm / s

[0176] · Lubricated

[0177]Part 1 of the punch: Figure 11 A and Figure 11 Area A of B

[0178] · Particle 5a

[0179] [Table 1]

[0180] Table 1

[0181]

[0182] result in Figure 12 shown in the diagram. Since the evaluation parameter S value is calculated using the offset width L [mm], a small S value indicates a small line offset amount.

[0183] like Figure 12 A...

Embodiment 2

[0186] Using manufacturing apparatus 1 in which method 1 was replaced by method 2, FEM of the above mold for line shift evaluation was performed under the test conditions shown in Table 2, using the evaluation parameter S=L×|H| described in Patent Document 1 1 / 3 Quantitative evaluation of line offset was carried out. As described above, those skilled in the art can adjust the coefficient of static friction by appropriately selecting the height, diameter, density, center-to-center distance between adjacent protrusions, and the like.

[0187] [Table 2]

[0188] Table 2

[0189]

[0190] In this FEM analysis, the friction coefficient between the vicinity of the convex portion 2b of the punch 2 and the punch shoulder fillet 2c is locally increased by forming the protrusion 8, and the movement of the initial bending portion of the blank with the convex portion 2b is obtained. amount (offset).

[0191] In this analysis, the coefficient of static friction is based on 0.10.

[...

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Abstract

Provided is an outer-plate panel manufacturing method with which it is possible, when manufacturing an outer-plate panel having a character line by pressing, to suppress the occurrence of line misalignment. A punch 2 has a punch apex portion 2a provided with a projecting portion 2b for molding a bent surface of a character line and a punch shoulder R portion 2c. At least one of the projecting portion 2b and the punch shoulder R portion 2c provides a blank with a surface pressure higher than a surface pressure with which the blank is provided by means of a remaining portion 2d of the punch 2 excluding the projecting portion 2b and the punch shoulder R portion 2c. A first portion of the punch 2 including at least one of the projecting portion 2b and the punch shoulder R portion 2c has a coefficient of static friction with respect to the blank which is greater than a coefficient of static friction of a second portion of the punch 2 excluding the first portion with respect to the blank.

Description

technical field [0001] The present invention relates to a manufacturing method and a manufacturing device of an outer panel panel having a characteristic line. Background technique [0002] Exterior panels such as a door outer panel, a fender panel, a side panel, a hood outer panel, and a rear door outer panel are known as an automobile body. In recent years, as one method for realizing an exterior design with high designability, a method of providing a clear character line on an outer panel panel, particularly an outer panel panel on a side of a vehicle body, has been widely used. [0003] The characteristic line is a convex ridgeline (bent surface) formed between at least two surfaces of the outer panel. In addition, the sharp characteristic line means that the radius of curvature of the bending surface is small, for example, it is 10 mm or less, or the angle of the smaller of the two angles formed by the extension surfaces of the two surfaces, that is, the included angle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/26B21D24/00B60J5/04B62D65/00
CPCB60J5/04B62D65/00B21D53/88B21D22/22B21D22/26B21D24/00B65D65/00B21D28/26
Inventor 泽靖典斋藤雅宽米村繁江上徹中村考基
Owner NIPPON STEEL CORP