Preparation device and preparation method of macroporous diamond drawing die coating

Abstract

The invention discloses a preparation device and a preparation method of a macroporous diamond drawing die coating. The preparation device includes a CVD device, in which a rotational workbench, which is driven to rotate by a power device, and a drawing die, which is vertically mounted on the rotational workbench, are installed. A heating wire assembly is fixedly installed in an inner hole of the drawing die and includes two semi-annular molybdenum pieces and a plurality pairs of vertical heating wires which are arranged symmetrically on the two semi-annular molybdenum pieces. The end of each vertical heating wire is connected to one semi-annular molybdenum piece. The two semi-annular molybdenum pieces are respectively connected to a lamp filament electrode. By means of the structure, the preparation device is reasonable in design, so that the drawing die is very strong in wear resistance, is long in service life, is greatly reduced in cost, is improved in product quality, can be used for reducing the thickness of a metal tube wall, determining the diameter of a metal tube and the like, and can be used as a compression die.

Description

technical field [0001] The invention relates to a preparation technology of a chemical vapor deposition diamond coating drawing die, in particular to a large-aperture diamond drawing die coating preparation equipment and a preparation method, belonging to the technical field of metallurgical metal material plating. Background technique [0002] Large-diameter drawing dies are used for various purposes, such as metal wire drawing, thinning and sizing of metal pipe walls, etc. In the traditional drawing industry, tungsten carbide dies are widely used due to their low price, and in the drawing of diameter copper pipes, artificial diamond drawing dies cannot be completed, and tungsten carbide drawing dies are the best choice. However, the wear resistance of the cemented carbide mold is poor, and the service life of the mold is short. The diamond film has excellent properties such as hardness very close to natural diamond, high elastic modulus, high thermal conductivity, good se...

AI Technical Summary

Problems solved by technology

[0004] However, in the squirrel-cage heating wire assembly, the only way to improve the coating uniformity on the surface of the inner hole is to increase the number of heating wires in the heating wire assembly, but the larger the number of heating wires, the more difficult the production of the heating wire assembly. trouble

Moreover, as the aperture increases, the number of hot wires also increases. The distance between the hot wire and the inner hole is generally 5-7mm. If the distance is too small, the uniformity of the coating will deteriorate. On the contrary, if the distance is too large, although Good for coating uniformity, but coating quality and deposition rate will decrease

This defect causes the effect of the hot wire assembly to be poorer when the aperture is larger, and limits the diameter of the mold aperture that can be deposited to not be too large

Moreover, if the hot wire is placed horizontally, it will collapse after heating and deviate from the axis

Images