A method for surface treatment of stamping die with synergistic effect of laser microtexture and coating

Abstract

The invention relates to a stamping die surface treatment method with synergistic effect of laser micro-texture and coating, comprising the following steps: identifying key friction-sensitive areas and easy-wear areas on the die surface; implementing optimally matched spherical crown texture and concave areas on the die surface Body texture processing; coating on the surface of the mold, so that the coating in the critical friction-sensitive area of ​​the mold replicates the texture morphology, and the coating in the easy-to-wear area covers the texture morphology. The beneficial effects of the invention are as follows: the friction characteristics of the die / workpiece interface are precisely controlled, the uneven deformation behavior of the workpiece material is suppressed, the thickness uniformity of the workpiece is improved; The meshing force increases the service life of the mold; improves the mechanical properties of the surface material of the workpiece and prevents the surface of the workpiece from being scratched.

Description

technical field [0001] The invention relates to the field of mold surface treatment, in particular to a stamping mold surface treatment method with the synergistic effect of laser microtexture and coating. Background technique [0002] As an important tool for forming thin-walled metal sheets, 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 load, which brings two common and prominent technical challenges: one is the wrinkling and cracking defects caused by the uneven thickness of the workpiece; the other is the wear of the mold. , deformation, cracking and other reasons lead to failure. [0003] For the wrinkling and cracking defects of the workpiece, the method of drawing bead and sheet surface filming is generally used. The former retards the flow of the material, and the latter promotes the flow of the material. In fact, wrink...

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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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