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Method for enhancing service life of cold-stamping mould of automobile by composite coating

A composite coating and die life technology, which is applied in the field of using composite coating to improve the life of automobile cold stamping dies, can solve problems such as short life, roughening, and cracking, and achieve material cost saving, processing cost saving, and processing cycle shortening Effect

Inactive Publication Date: 2011-08-31
湖北吉隆表面工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem solved by the invention: the cast iron mold must be repaired only after stamping 10,000 to 20,000 times, and the service life is short; the phenomena of cracking, roughening and scratching on the surface of the stamping workpiece are avoided

Method used

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Embodiment Construction

[0027] One, technological process of the present invention:

[0028] (1) Mechanical rough grinding and mechanical fine grinding of the cast iron mold surface;

[0029] (2) mechanical polishing;

[0030] (3) Dry degreasing;

[0031] (4) Weak etching by dry method;

[0032] (5) Washing in cold water;

[0033] (6) Preheat the cast iron mold to 30-90°C;

[0034] (7) Composite coating of chemical reduction co-deposited Ni-P-nano-scale spherical particles:

[0035] Solution composition:

[0036] NiSO 4 .6H 2 O 20~70g / L,

[0037] NaH 2 PO 2 .H 2 O 10~40g / L,

[0038] Complexing agent 10~50g / L,

[0039] Accelerator 5~20g / L,

[0040] PH: 3.0~6.5, temperature: 30℃~90℃,

[0041] Deposition time: 0.5h~4h,

[0042] Solid particles: 10~150g / L (nanoscale artificial diamond or nanoscale fullerene solid particles);

[0043] The matrix of the composite coating deposited on the surface of the mold is Ni-p alloy, and at the same time, 5-20% of nano-sized spherical particles are ev...

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Abstract

The invention provides a method for enhancing the service life of a cold-stamping mould of an automobile by a composite coating. The method is characterized by comprising the following steps: firstly, carrying out polishing treatment on the surface of a cast iron mould; afterwards, precipitating the composite coating on the surface of the cast iron mould by chemical reduction, wherein a basal body of the composite coating is Ni-p alloy, 5-20% of spherical particle with nano level size is evenly distributed in an alloy layer, and the spherical particle is nano level artificial diamond or fullerene granules; and then, carrying out polishing treatment on the surface of the cast iron mould. The invention adopts the flexible grinding and polishing of the surface of the mould until a mirror face is smooth, so that the service life of the mould can be enhanced, the smoothness degree of a stamping workpiece is enhanced, and the napping phenomenon of the surface of the workpiece is reduced. The composite coating is precipitated by chemical reduction, the wear resistance of the mould is increased, the stamping frequency of the cast iron mould reaches 8-10 ten thousand times, and the phenomena of tension fracture, napping and scratch formed on the surface of the stamping workpiece are avoided.

Description

technical field [0001] The invention relates to a method for improving the service life of a composite coating on the surface of an automobile cold stamping die. Background technique [0002] Carbon is one of the most abundant elements on the earth. Materials composed of a single carbon element have greatly different properties due to their different structures. Graphite with a hexagonal planar structure is extremely soft. Diamond, which has an equiaxed cubic structure, is the hardest mineral in the world. Fullerene (ball) is a newly discovered allotrope of the third type of carbon, usually a completely symmetrical hollow carbon sphere composed of 60 carbon atoms, with good symmetry, like a modern football. Under normal conditions, C60 fullerenes (spheres) are as soft as graphite, but when squeezed to 70% of their original volume, they are harder than diamond. After the extrusion force is removed, it can be elastically deformed to return to its original shape. This is a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/02
Inventor 张三元
Owner 湖北吉隆表面工程有限公司
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