CN101829720A - Method for controlling springback of reverse bending sections of hyperboloid - Google Patents

Abstract

The invention uses the double-arc structure of the bottom surface of the die punch and the surface of the top plate to control the springback of sheet metal stamping forming, and belongs to the technical field of stamping forming. The invention provides a springback control method of a hyperboloid reverse bending cross section, which includes components such as a punch with a double-arc bottom surface, a top plate with a double-arc surface, and the like. The punch and top plate of this structure are used to carry out the anti-deformation of the sheet material first, and use this anti-deformation to compensate the springback of the two side walls of the section after unloading, so that the section is no longer open. At the same time, the double-arc structure can realize reliable positioning in sheet metal forming, thereby improving the overall forming quality of the formed part.

Description

Springback Control Method of Hyperboloid Reverse Bending Section

Technical field:

The invention utilizes the bottom surface of the mold punch and the surface structure of the top plate to control the springback of sheet metal stamping forming, and belongs to the technical field of stamping forming.

Background technique:

Hat-shaped stamping parts are widely used in many industries, especially in the rail vehicle body structure. This kind of part is a very important car body structural part, which requires a large amount and requires high forming quality and precision. Forming accuracy directly affects the quality of car body manufacturing. However, the forming quality and precision of the hat-shaped stamping parts have been poor, mainly because the special opening structure of the hat-shaped cross-section makes it very difficult to form, and the springback problem is difficult to control, resulting in the excessive opening of the formed parts and the overall Many defects such as shape distortion have been greatly affecting product quality, which is a problem that has been expected to be solved for a long time in the field of stamping and forming manufacturing.

Based on the above reasons, on the basis of systematic theoretical analysis and a large number of experiments, the present invention proposes a hyperboloid reverse bending section springback control method, which can effectively control the springback of the side wall of the hat-shaped part and greatly improve the strength of the hat-shaped stamping part. Forming accuracy and quality.

Invention content:

The invention provides a springback control method for a hyperboloid reverse-bending section, using a punch with a double-arc bottom surface and a pressing top plate to realize the reverse deformation of the sheet metal, and compensate for the springback deformation of the two side walls of the hat-shaped section after unloading, thereby improving the quality of the formed parts. accuracy. It is mainly used to produce high-precision hat-shaped cross-section stamping parts.

Description of drawings:

Fig. 1 is the structural schematic diagram of the present invention, and 1 is the punch with hyperboloid at the top, 2 is sheet material, and 3 is the top plate with hyperboloid at the top

Detailed ways:

The technical design scheme of the present invention is as follows: the bottom surface of the punch and the upper surface of the top plate of the stamping die are designed as a double-arc profile. The punch moves down until the lower limit point to stamp the sheet. After unloading, the anti-deformation springback just compensates for the springback on both sides of the section, so that the two side walls are no longer everted, and the section is no longer open, thus greatly Significantly improve the forming accuracy.

The advantages of the present invention are: compared with the stamping and forming of traditional hat-shaped parts, the cross-sectional opening of the formed part can be reduced by more than 90%, basically eliminating the influence of springback on the shape of the hat-shaped cross-section, and realizing the stability of the sheet metal during forming Positioning, thereby greatly improving the forming accuracy and product quality of the formed parts.

Claims (4)

1. the present invention relates to a kind of method for controlling springback of reverse bending sections of hyperboloid, it is characterized in that: two arc-shaped surface are made in hat stamping parts mould punch bottom surface and cover top surface, plate is pressed on the punch circular-arc bottom face by top board during shaping, make plate reversible deformation occur, during unloading, the resilience that the two arc surfaces that are bent produce can compensate the resilience of cap two side.

2. according to the described method for controlling springback of reverse bending sections of hyperboloid of claim 1, it is characterized in that: mould punch bottom surface and cover top surface are two arc structures.

3. according to claim 1,2 described method for controlling springback of reverse bending sections of hyperboloid, it is characterized in that: plate is first reversible deformation before shaping, the resilience of this reversible deformation compensation of unloading back utilization cross section dual-side.

4. according to claim 1,2 described method for controlling springback of reverse bending sections of hyperboloid, it is characterized in that: can realize that with punch and top board plate is in the effective location in forming process, reversible deformation springback capacity in two side, cross section can be adjusted separately, improves drip molding cross section precision and global shape precision.

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