Surface hardened graphite mold and method of surface hardening

A graphite mold, surface deposition technology, applied in metal material coating process, vacuum evaporation plating, coating and other directions, can solve the problems of easy wear and depression, high density, no more than several thousand times, etc., to achieve good resistance. The effect of friction and high temperature oxidation resistance, improving hardness and wear resistance, and improving service life

Active Publication Date: 2022-06-21
维达力汽车科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphite molds made of graphite materials have the following disadvantages: (1) The soft properties of graphite materials make the surface of graphite molds very difficult to polish, and the surface of graphite molds after precision machining is difficult to achieve a high degree of polishing It will affect the final dimensional precision of the glass processed by it. Even if the surface polishing degree of the graphite mold meets the requirements, its polishing degree is difficult to maintain during the hot pressing process, resulting in the service life of the general graphite mold will not exceed several thousand times (2) The special energized crystallization production process of graphite materials determines that its density cannot be higher than 80%. After the graphite materials are made into graphite molds, the interior and surface of the graphite molds also have certain porosity, causing graphite mold surface It is not pressure-resistant and easy to wear, and the corners of the graphite mold will be more prone to wear and depression when the force is the greatest during the pressing process; (3) The graphite material has a special layered structure and slippage between layers leads to graphite molds It is difficult to attach hard films (carbides, metals, etc.)
The above deficiencies of the graphite mold directly lead to an increase in the difficulty and cost of polishing the 3D glass obtained through its processing in the subsequent polishing process, and even lead to an increase in the defective rate of the 3D glass

Method used

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  • Surface hardened graphite mold and method of surface hardening
  • Surface hardened graphite mold and method of surface hardening
  • Surface hardened graphite mold and method of surface hardening

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The present embodiment is a method for hardening the surface of a graphite mold, and the steps are as follows:

[0042] (1) Surface pretreatment

[0043] The graphite mold is fixed on the turn frame placed in the vacuum chamber of the PVD furnace, and the surface of the graphite mold is cleaned with plasma to obtain the cleaned graphite mold.

[0044] According to the different process parameters (see Table 1), the cleaning of the graphite mold is divided into the following three stages, and in these three stages, the temperature of the vacuum chamber of the PVD furnace needs to be kept at 120 °C, and the rotation speed of the turret should be kept at 120°C. 4RPM:

[0045] The first stage: adjust the vacuum degree of the vacuum chamber of the PVD furnace to 3.0×10 -3 , and then pour argon with a flow rate of 400sccm into the vacuum chamber;

[0046] The pulse bias applied to the graphite mold increased from -700V to -1000V. During the process of applying the pulse bi...

Embodiment 2

[0074] (1) Pretreatment of the surface:

[0075] The graphite mold is fixed on the turn frame placed in the vacuum chamber of the PVD furnace, and the surface of the graphite mold is cleaned with plasma to obtain the cleaned graphite mold.

[0076] According to the different process parameters (see Table 3), the cleaning of the graphite mold is divided into the following three stages, and in these three stages, the temperature of the vacuum chamber of the PVD furnace needs to be kept at 120 ℃, and the rotation speed of the turret should be kept at 120°C. 4RPM:

[0077] The first stage: adjust the vacuum degree of the vacuum chamber of the PVD furnace to 2.8×10 -3 , and then pour argon with a flow rate of 400sccm into the vacuum chamber;

[0078] The pulse bias applied to the graphite mold increased from -700V to -1000V. During the process of applying the pulse bias to the graphite mold, a large number of argon ions were generated on the surface of the graphite mold. The argo...

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PUM

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Abstract

The invention relates to a method for surface hardening of a graphite mold, comprising surface treatment, vacuum chrome plating, vacuum titanium plating and vacuum titanium nitride plating. The graphite mold treated by the surface hardening method of the graphite mold has good friction resistance and high temperature oxidation resistance, and this method significantly improves the hardness of the graphite mold surface, making the graphite mold more suitable for 3D glass processing and improving the graphite mold. The service life of the mold.

Description

technical field [0001] The invention relates to the technical field of material surface treatment, in particular to a surface-hardened graphite mold and a surface-hardening method thereof. Background technique [0002] With the development of mobile terminal mobile phones in the future, 3D glass has gradually become a popular trend for mobile phone covers. 3D glass cover generally includes two types of front cover glass and rear cover glass. The ultimate requirements of front cover glass and rear cover glass are different, but the production process is basically the same, that is, starting from 2D white glass, on the hot bending machine The graphite mold is used to perform hot bending to form a 3D hyperbolic or four-curved shape, followed by polishing and chemical tempering, and then entering the post-processing process. Among them, hot bending is a key process in 3D glass processing, and the graphite mold is the only solid in contact with the glass surface in this key proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/02C23C14/06C23C14/16C23C14/18C23C14/32
Inventor 孔德恒王和永李汉勇郝嘉伟许仁王伟吴畅
Owner 维达力汽车科技有限公司
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