Anti-double material device for automobile forming molds

Abstract

The invention relates to an automobile forming die anti-double-material device, and belongs to the technical field of automobile covering part dies. The automobile forming die anti-double-material device is mainly suitable for a high-strength plate or thick plate die structure. The double-material device is additionally arranged between a wedge sliding block and insert of a die, and key parameters (breaking point relative position determined by fracture width b, f1 and f2, and receding distances d1 and d2 of two sides) are reasonably designed, so that the strength of the die is safe and reliable when a single plate material is formed in a normal state. When two plates are formed in a die cavity, the section A-A of the anti-double-material device is broken before a die main body structure loses effect. In the fracture process, the receding space in the device is used for buffering the contact stress of forming surfaces of the insert, a die seat and the like, so that the structure of the die is not damaged, and the safety and service life of the whole die can be ensured.

Description

technical field [0001] The invention relates to a double-material preventing device for automobile forming molds, which belongs to the technical field of automobile cover moulds. Background technique [0002] The original intention of the design structure of any mold is to form a sheet, mainly because there is no space in the design of the mold structure to form two sheets at the same time. When two sheets are formed by accident, there are two situations according to the thickness and tensile strength of the sheet: [0003] One is when forming two sheets, such as forming a single sheet with a thickness of 0.6mm in the outer sheet, due to an extra sheet thickness, all the force of the tonnage of the press will act on the second sheet, resulting in The thickness of the second sheet can only be avoided by the elastic deformation of 0.6mm in the stressed part of the mold. According to experience, usually after the elastic deformation of 0.6mm occurs in the mold structure, the m...

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Problems solved by technology

[0004] The other is the mold structure for forming high-strength plates or thick plates. For example, when forming medium-high-strength plates with a thickness of 1.2mm, due to the high yield strength of medium-high-strength plates, when all the tonnage of the press is applied under the second sheet In the mold structure, according to the actual working conditions, the mold structure can hardly return to its original shape after the elastic deformation of more than 1.2mm, and most of the time, plastic fracture will occur at the stress concentration part of the mold

[0005] In terms of the probability of grabbing double materials and the degree of damage, the high-strength panels in automobile molds, such as A-pillars, B-pillars, etc., are beam-shaped in size, and the phenomenon of grabbing double-materials is particularly serious when automatic feeding devices are used to grab blanks. Although the anti-double material sensor can avoid the above phenomenon to a certain extent, sometimes it is not effective in some structures or production lines, and cannot guarantee a 100% double material recognition rate

According to previous quality accidents, when double material occurs, due to the small gap of the mold surface, when the thickness is increased by one plate, the force on the mold insert or mold base during forming increases sharply, resulting in the fracture of the mold base or insert , on the one hand, it will cause economic loss of the mold, and at the same time, it will cause the automatic stamping production line to stop production for more than one month

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