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W-N nano composite-structured coating for miniature end milling cutters and preparation method thereof

A nano-composite, W-N technology, applied in the direction of coating, metal material coating process, ion implantation plating, etc., can solve the problems of shortened tool life, poor processing quality, etc., and achieve the effect of high hardness

Active Publication Date: 2019-01-25
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like figure 1 As shown, after the coated micro-drill is drilled, the cutting edge has obvious chipping phenomenon, the coating peels off, and the tool substrate is exposed, which shortens the tool life and poor processing quality

Method used

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  • W-N nano composite-structured coating for miniature end milling cutters and preparation method thereof
  • W-N nano composite-structured coating for miniature end milling cutters and preparation method thereof
  • W-N nano composite-structured coating for miniature end milling cutters and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Select a micro-drill with a diameter of 0.3mm to deposit a W-N nanocomposite structure coating by DC magnetron sputtering. The steps are as follows:

[0033] 1. Small-diameter knife surface pretreatment: ultrasonically clean the micro-drill in acetone and absolute ethanol for 10 minutes, dry it with hot air, clamp it on a three-dimensionally rotatable planetary carrier, and send it into the chamber;

[0034] 2. Vacuumize the chamber: firstly pump the chamber to a vacuum of 4×10 through mechanical pump and molecular pump -5 Below mbar, then set the temperature of the infrared heating tube to 600°C, set the heating time to 30min, and then pump the chamber vacuum to 4×10 -5 Below mbar, set the temperature of the infrared heating tube to 550°C and the heating time to 30 minutes. After heating again, the vacuum degree of the chamber is evacuated to 4×10 -5 Below mbar, fully remove the volatile impurities on the surface of the chamber and the small diameter knife;

[0035] 3....

Embodiment 2

[0042] Select a micro-drill with a diameter of 0.15mm to deposit a W-N nanocomposite structure coating by DC magnetron sputtering, and the steps are as follows:

[0043] 1. Small-diameter knife surface pretreatment: the same as in Example 1;

[0044] 2. Vacuumize the chamber: the same as in Example 1;

[0045] 3. Ion etching on the surface of the small-diameter knife: Before depositing the film, the arc-enhanced glow discharge technology is used to perform ion cleaning and etching on the cemented carbide small-diameter knife to enhance the bonding ability of the film base. The conditions for ion etching are: (1) The arc target used as the electron source adopts a Ti target with a purity of more than 99%, and the target current is 90A; (2) The planetary frame on which the small-diameter knife is placed is connected to the negative pole of the pulse power supply, and bipolar pulses are used. The negative bias voltage gradually increases from -50V to -300V, the positive voltage ...

Embodiment 3

[0051] Select a micro-drill with a diameter of 0.15mm to deposit a W-N nanocomposite structure coating by high-power pulse magnetron sputtering. The steps are as follows:

[0052] 1. Small-diameter knife surface pretreatment: the same as in Example 1;

[0053] 2. Vacuumize the chamber: the same as in Example 1;

[0054] 3. Ion etching on the surface of the small-diameter knife: Before depositing the film, the cemented carbide substrate is ion-cleaned and etched using arc-enhanced glow discharge technology to enhance the bonding ability of the film substrate. The conditions for ion etching are: (1) The arc target used as the electron source adopts a Ti target with a purity of more than 99%, and the target current is 70A; (2) The planetary frame on which the small diameter knife is placed is connected to the negative pole of the pulse power supply, and a bipolar pulse is used. The negative bias voltage gradually increases from -50V to -300V, the positive voltage is +20V, the fr...

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Abstract

The invention discloses a W-N nano composite-structured coating for miniature end milling cutters and a preparation method thereof, and relates to the field of material surface working. The componentsof the coating comprise 80-100at.% of tungsten and 0-20at.% of nitrogen in atomic percent. The preparation method comprises the following steps: firstly, performing ultrasonic cleaning on a hard alloy miniature end milling cutter, then performing plasma etching on the surface of the hard alloy miniature end milling cutter by an electric arc enhancement type glow discharge technique; and introducing N2 and Ar into a chamber, under the condition of certain substrate negative bias, deposition temperature, sputtering target power, and the like, performing magnetron sputtering coating to obtain the W-N nano composite-structured coating. The preparation method adopts the magnetron sputtering technique to perform coating treatment on a substrate and deposit the W-N nano composite-structured coating, and the coating is well bonded with the cutter substrate, realizes high surface hardness and good chip removal performance of the miniature end milling cutter, and can effectively improve the service life and processing quality of the cutter.

Description

technical field [0001] The invention relates to the field of material surface processing, in particular to a small-diameter knife coating with a W-N nanocomposite structure and a preparation method thereof. Background technique [0002] Today's aviation manufacturing, automobile manufacturing and 3C electronics industries continue to develop, and machining is constantly moving towards high precision, high speed, and high efficiency. Small-diameter milling cutters, drills and other precision machining tools have emerged as the times require. Small-diameter knives are usually made of ultra-fine grain WC-Co carbide, which is less rigid. To improve the machining performance of small-diameter knives, one or more layers of hard coatings with excellent comprehensive properties can be deposited on the surface of small-diameter knives by physical vapor deposition (PVD). [0003] There are three basic categories of PVD technology: vacuum evaporation, multi-arc ion plating and sputter...

Claims

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Application Information

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IPC IPC(8): C23C14/02C23C14/06C23C14/35C23C14/16
CPCC23C14/0036C23C14/022C23C14/0641C23C14/0688C23C14/165C23C14/35
Inventor 王成勇邓阳匡同春陈汪林何醒荣郑李娟
Owner GUANGDONG UNIV OF TECH
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