Stamping die surface treatment method with synergistic effect of laser microstructure and coating

Abstract

The invention relates to a stamping die surface treatment method with a synergistic effect of a laser microstructure and a coating. The stamping die surface treatment method comprises the following steps that a key friction sensitive area and an easily-abraded area on the surface of a die are recognized; optimally matched spherical crown-shaped structure and concave structure machining is conducted on the surface of the die; and coating machining is conducted on the surface of the die, so that the coating of the key friction sensitive area of the die copies the structure morphology, and the coating of the easily-abraded area covers the structure morphology. The method has the beneficial effects that the die / workpiece interface friction characteristic is accurately regulated and controlled, the uneven deformation behavior of a workpiece material is inhibited, and the thickness uniformity of the workpiece is improved; the integrated gain effect of the structure and the coating is exerted, the mechanical engagement force of the coating and a base body is enhanced, and the service life of the die is prolonged; and the mechanical property of workpiece surface layer materials is improved, and workpiece surface scratches are prevented.

Description

technical field [0001] The invention relates to the field of mold surface treatment, in particular to a stamping mold surface treatment method in which laser micro-texture and coating cooperate. Background technique [0002] As an important tool for thin-wall sheet metal forming, stamping dies are widely used in automobiles, ships, aerospace and other fields. However, its forming is usually carried out under harsh working conditions such as high pressure and alternating loads, which brings two common and prominent technical challenges: one is wrinkling and cracking defects caused by uneven thickness of the workpiece; , deformation, cracking and other reasons lead to failure. [0003] In view of the wrinkling and cracking defects of the workpiece, the method of drawing beads and sheet surface film is generally used at present. The former retards the flow of materials, and the latter promotes the flow of materials. In fact, wrinkling and cracking only occur in a very limited...

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Problems solved by technology

However, this method increases lubrication and reduces friction, increases the flow velocity of the material, and the phenomenon of excessive thinning rate or even cracking is prone to occur in the area where the flow velocity of the original material is relatively fast.

The Chinese patent introduces a laser composite modeling treatment method for the surface of metal plastic forming molds. This method combines the micro-pit texture and the micro-protrusion texture, and uses the micro-protrusion texture to produce a pinning effect to improve the surface of the formed part. Hardness, using the micro-pit texture to reduce friction and improve material flow, but because the micro-protrusion texture is in point contact with the surface of the formed part, it is easy to wear, resulting in low mold life and unclear morphology of the micro-protrusion , if the crater shape is used, it is easy to cause scratches on the surface of the workpiece

[0007] 1. Processing the convex texture on the surface of the mold can increase friction and delay the flow of materials, but some convex textures, such as craters, are likely to cause scratches on the surface of the sheet

[0008] 2. The concave-convex texture processed on the surface of the mold can accurately control the flow of the workpiece material, but the wear resistance is poor

[0009] 3. The coating on the surface of the mold has poor bonding force and is easy to peel off, so the service life of the coating mold is not high

[0010] If micro-texture is processed on the surface of the mold and self-lubricating materials are provided, the wear resistance of the mold surface itself will not be improved, and there will still be greater wear under certain circumstances.

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