A preparation method of laser-assisted electric jet deposition soft-hard composite coating tool

A soft-hard composite, laser-assisted technology, applied in coating, superimposed layer plating, metal material coating process, etc., can solve the problems of expensive powder, affecting tool life, high cost, reducing cutting temperature, reducing Cutting force, effect of short production cycle

Active Publication Date: 2019-09-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent application 201711013252.8 discloses a WS based on electrojet 2 The preparation method of the soft-coated cutting tool, which adopts the electro-jet deposition process to directly deposit WS on the surface of the cutting tool substrate 2 The soft coating greatly reduces the friction coefficient of the tool surface, but the prepared soft coating tool has poor wear resistance and affects the service life of the tool
However, this method has high requirements on the quality of coating material powder and the powder used is relatively expensive, and the process of laser cladding soft coating material is very easy to cause MoS 2 or WS 2 Oxidative deterioration of materials, which in turn affects the lubricating properties of the coating
[0006] In summary, the existing preparation methods of composite coating tools still have unsatisfactory bonding between the hard coating and the substrate, the quality of the soft coating is difficult to guarantee, the coating preparation efficiency is low, the service life is short, the coating preparation process is complicated, and the cost is high. Defects, therefore, it is necessary to study a new preparation method of composite coating tools in order to overcome the above defects

Method used

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  • A preparation method of laser-assisted electric jet deposition soft-hard composite coating tool
  • A preparation method of laser-assisted electric jet deposition soft-hard composite coating tool

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The tool material used in this embodiment is W18Cr4V high-speed steel, and the material of the soft coating powder is MoS 2 , the material of the hard coating powder is Al 2 o 3 , the solvent is deionized water, the binder is polyvinyl alcohol, and the material of the soft coating layer powder is MoS 2 .

[0050] like Figure 1-2 Shown, a kind of preparation method of laser-assisted electric jet deposition soft-hard composite coating tool, comprises the following steps:

[0051] (1) Ultrasonic cleaning of the tool in acetone and absolute ethanol for 20 minutes in order to remove the dirt on the surface;

[0052] (2) Mix the hard coat powder, solvent, and binder with a weight ratio of 12:40:1 to prepare a suspension (hereinafter referred to as hard coat slurry), and put the hard coat slurry 2 into Syringe 1, control the hard coat slurry by micro-injection pump 3 to 4 x 10 -13 m 3 / s flow rate, and form micron-scale stable jets 8 and nano-droplets 7 in the high-vol...

Embodiment 2

[0060] The tool material used in this embodiment is W6Mo5Cr4V2 high-speed steel, and the material of the soft coating powder is WS 2 , the hard coating powder is made of cemented carbide, and its important components are 80% WC, 10% Co, 5% W, 1.5% VC, 1% Cr 3 C 2 , 1% Ni, 1% Al and 0.5% Mo, the solvent is ethanol, the binder is ethyl cellulose, and the material of the soft coating layer powder is WS 2 .

[0061] like Figure 1-2 Shown, a kind of preparation method of laser-assisted electric jet deposition soft-hard composite coating tool, comprises the following steps:

[0062] (1) Ultrasonic cleaning of the tool in acetone and absolute ethanol for 20 minutes in order to remove the dirt on the surface;

[0063] (2) Mix the hard coat powder, solvent, and binder with a weight ratio of 10:40:1 to obtain a suspension (hereinafter referred to as hard coat slurry), and put the hard coat slurry 2 into Syringe 1, control the hard coat slurry by micro-injection pump 3 to 4 x 10 -...

Embodiment 3

[0071] A kind of preparation method of laser-assisted electric jet deposition soft and hard composite coating tool, with embodiment 1, difference is: in step (2), the weight ratio of described hard coating powder, solvent, binding agent is 30: 30:5, the flow rate of the hard coat slurry is 5×10 -13 m 3 / s; the distance between the nozzle and the cutter substrate is 5mm; the moving speed of the nozzle is 40mm / s, the deposition thickness of the hard coating wet film is 100μm; the voltage of the high voltage electric field is 0.1Kv. In step (4), the laser parameters are: power 100W, spot diameter 2mm, scanning speed 4mm / s, overlapping rate 50%. In step (5), the wet film thickness of the soft coating is 80 μm, and the weight ratio of the soft coating powder, inorganic solvent, and binder is 10:15:1.

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Abstract

The invention relates to a preparation method of a laser assisted electric jet deposition soft and hard composite coating cutter, and belongs to the technical field of mechanical cutting tool manufacturing. Firstly, coating material nanopowder is prepared into suspension liquid; the suspension liquid forms micron order stable jet and nanograde liquid drops in a high-voltage electric field; the liquid drops are jetted and deposited on a cutter base body to from a soft / hard coating; then, the deposition coating is subjected to heat baking treatment; laser is assisted for completing the curing and formation of the coating. The processing formation of the cutter composite coating with the whole integration and the orderly ranged soft and hard coating structure is realized by the method; meanwhile, the process has the advantages of operation convenience, simplicity and short production period.

Description

technical field [0001] The invention relates to the field of mechanical cutting tool manufacturing, in particular to a method for preparing a soft-hard composite coating tool by laser irradiation and assisted electric jet deposition technology. Background technique [0002] Compared with traditional knives, coated knives have higher wear resistance, hardness and thermal stability, and thus are widely used. According to the properties of coating materials, coated tools can be divided into two categories: hard coated tools and soft coated tools. Hard-coated tools pursue high hardness and good wear resistance. Typical hard-coated materials include TiN, Al 2 o 3 , TiCN, TiAlN, etc. The pursuit of soft coating tools is low friction coefficient, typical soft coating materials are solid lubricating materials with low friction coefficient, such as MoS 2 、WS 2 , BN, CaF 2 Wait. Soft and hard composite coatings have gradually become one of the development trends of coated tools...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C23C24/04C23C28/04
Inventor 李学木邓建新孙婕张亮亮
Owner SHANDONG UNIV
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