Coating applied to thread forming tap

An extrusion tap and coating technology, which is applied in coating, metal extrusion die, metal material coating process and other directions, can solve the problems of tool cutting edge damage, large impact of tool wear, accelerated tool damage, etc., and achieve production costs. Low, good adhesion, wear-reducing effect

Inactive Publication Date: 2013-07-24
李固加
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is precisely because titanium alloy has good plasticity and certain toughness and strength, so it leads to serious work hardening phenomenon, which is easy to cause damage to the cutting edge of the tool
Due to its high strength at high temperature and low thermal conductivity, the cutting temperature is high, which has a great impact on tool wear. Because it has considerable toughness and strength, and high elongation, it is easy to form built-up edge and accelerate tool damage.
These conditions will bring great diffi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Clean the ordinary taps with ultrasonic degreasing and wax removal, dry them, place them in the chamber of the self-developed VAST-P800 coating equipment, heat and evacuate to 5×10 -3, the substrate temperature is 350 degrees, argon gas is passed through, the argon gas pressure is maintained at 0.1 Pa, the substrate bias voltage is between 800-900V, and glow discharge cleaning is performed for 45 minutes. After cleaning with argon gas, deposit a 200 nm-thick Cr layer transition layer on the substrate at a pressure of 0.1 Pa, a substrate temperature of 350°C, and a bias voltage of -250V. Then, turn off the argon gas, fill it with nitrogen gas, turn on the TiAl (alloy target) and Cr target under the conditions of 0.5 Pa, 300 degrees of nitrogen partial pressure, and -150V bias voltage, deposit TiAlCrN to reach a thickness of 300 nanometers, close the TiAl target, adjust Nitrogen partial pressure, make the nitrogen partial pressure at 0.5 Pa, deposit CrN to a thickness of ...

Embodiment 2

[0029] Clean the ordinary taps with ultrasonic degreasing and wax removal, dry them, place them in the chamber of the self-developed VAST-P800 coating equipment, heat and evacuate to 5×10 -3 , the substrate temperature is 350 degrees, argon gas is passed through, the argon gas pressure is maintained at 0.1 Pa, the substrate bias voltage is between 800 and 900V, and glow discharge cleaning is performed for 35 minutes. After the argon cleaning is completed, fill with nitrogen, the partial pressure of nitrogen is 0.4Pa, the partial pressure of argon is 0.2Pa, the temperature of the substrate is 350 degrees, and the bias voltage is -200V. Open the Ti target and deposit 250 nm on the substrate. Thick TiN layer transition layer. Then, turn off the argon gas, fill in nitrogen gas, open the Cr target under the condition of nitrogen partial pressure at 0.4 Pa, temperature 300 degrees, and -120V bias, deposit CrN to a thickness of 300 nanometers, adjust the nitrogen partial pressure so ...

Embodiment 3

[0031] Clean the ordinary taps with ultrasonic degreasing and wax removal, dry them, place them in the chamber of the self-developed VAST-P800 coating equipment, heat and evacuate to 5×10 -3 , the substrate temperature is 350 degrees, argon gas is passed through, the argon gas pressure is maintained at 0.1 Pa, the substrate bias voltage is between 800-900V, and glow discharge cleaning is performed for 45 minutes. After cleaning with argon gas, a 250 nm-thick TiN transition layer was deposited on the substrate under a pressure of 0.1 Pa, a substrate temperature of 350 degrees, and a bias voltage of -250 V. Then, turn off the argon gas, fill it with nitrogen gas, turn on the TiAl (alloy target) and Cr target under the conditions of 0.5 Pa, 300 degrees of nitrogen partial pressure, and -150V bias voltage, deposit TiAlCrN to reach a thickness of 200 nanometers, close the TiAl target, adjust Nitrogen partial pressure, make the nitrogen partial pressure at 0.5 Pa, deposit CrN to a t...

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PUM

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Abstract

The invention discloses a coating applied to a thread forming tap. The coating comprises a transition layer, a functional layer and a self-lubricating layer which are arranged on a substrate of the tap from inside to outside, wherein the transition layer is a ceramic-phase nanocrystal structure of at least one simple substance, nitride, carbide or nitrogen carbide in transition metal Ti, Cr and Zr with the thickness of 200-250nm; the main functional layer is a ceramic-phase nanocrystal structure compound layer formed by alternating TiAlCrN and CrN coatings with the thicknesses of 2-3 micrometers; and the self-lubricating layer is WC (wolfram carbide)/C with the thickness of 2 micrometers. The coating applied to the thread forming tap can allow the tap to have better wear resistance, adhesiveness resistance, high-temperature oxidation resistance and self-lubricating exclusiveness, so that the service life of the tap for titanium alloy processing is prolonged, the production cost is lowered, and the coating can be applied to various taps widely used in electronic and plastic industries.

Description

technical field [0001] The invention belongs to the technical field of plastic molding equipment, and more specifically relates to a coating applied to extrusion taps. Background technique [0002] Extrusion tap is a new type of thread tool that uses the principle of metal plastic deformation to process internal threads. Extrusion tap extrusion internal thread is a chip-free processing technology, especially suitable for copper alloys and aluminum alloys with low strength and good plasticity. It can also be used for tapping materials with low hardness and high plasticity such as stainless steel and low carbon steel, and has a long service life. The surface finish of the thread extruded by the extrusion tap is high, the metal fiber of the thread is not broken, and a layer of cold hard layer is formed on the surface, which can improve the strength and wear resistance of the thread. It fundamentally solves the problem of difficult chip removal in tapping, and is more conducive...

Claims

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Application Information

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IPC IPC(8): C23C14/06C23C14/35B21C25/02
Inventor 李固加
Owner 李固加
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