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Preparation method of mechanical machining tool

A technology of mechanical processing and cutting tools, which is applied in the field of preparation of mechanical processing cutting tools, can solve the problems of difficult control of cutting tool performance, complex preparation process, uneven porosity, etc., and achieve the goal of ensuring self-sharpening, uniform porosity, and improving cooling and lubrication capabilities Effect

Active Publication Date: 2015-04-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to solve the complex preparation process and the difficulty in controlling the performance of the cutting tool in the existing machining tool preparation method, and to solve the problems of uneven porosity, inconsistent density and uneven strength in the cutting tool prepared by the current powder metallurgy hot pressing method

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  • Preparation method of mechanical machining tool
  • Preparation method of mechanical machining tool
  • Preparation method of mechanical machining tool

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) The cemented carbide powder (NiCo alloy, alumina and boron powder) is fused and sintered, and then the particle size of the powder obtained by the crushing method is 25μm, and the dry powder is sent to the plasma spraying equipment;

[0032] (2) Smooth the surface of the 3cm-thickness template steel base (roughness R a ≤1μm), then use dry air to clean the surface of the stencil and apply 0.1mm magnesium oxide paint;

[0033] (3) Start the spraying system and manipulator for plasma spraying, the process parameters are: the main gas is Ar and N 2 , Argon gas flow rate is 80L / min, nitrogen gas flow rate is 20L / min; working current is 415A, working voltage is 140V; powder feeder powder feeding gas is Ar, gas flow rate is 60L / min; distance from nozzle to substrate Is 10cm, the nozzle's moving speed is 0.01m / s, and the required thickness of plasma spraying is completed at one time according to a certain direction of the template; the obtained spraying tool (such as figure 2 Sh...

Embodiment 2

[0037] (1) The ceramic powder (aluminum oxide, titanium oxide, silicon nitride and boron powder) is fused and sintered, and then the particle size of the powder obtained by the crushing method is 10 μm, and the dry powder is sent to the plasma spraying equipment;

[0038] (2) Smooth the surface of the copper base of the 3cm stencil (R a ≤1μm), then use dry air to clean the surface of the template;

[0039] (3) Start the spraying system and manipulator for plasma spraying, the process parameters are: the main gas is Ar and N 2 , Argon gas flow rate is 100L / min, nitrogen gas flow rate is 30L / min; working current is 450A, working voltage is 120V; powder feeder powder feeding gas is Ar, gas flow rate is 45L / min; distance from nozzle to substrate It is 12cm, the moving speed of the nozzle is 0.005m / s, and the required thickness of plasma spraying is completed at one time according to a certain direction of the template. The obtained spray tool has a thickness of 10mm, a porosity of up t...

Embodiment 3

[0043] (1) The cemented carbide powder (tungsten carbide and Co) is fused and sintered, and then the particle size of the powder obtained by the crushing method is 45μm, and the dry powder is sent to the plasma spraying equipment;

[0044] (2) Smooth the surface of the copper base of the template with a thickness of 1cm (R a ≤1μm), then use dry air to clean the surface of the template;

[0045] (3) Start the spraying system and manipulator for plasma spraying, the process parameters are: the main gas is Ar and N 2 , Argon gas flow rate is 120L / min, nitrogen gas flow rate is 30L / min; working current is 420A, working voltage is 160V; powder feeder powder feeding gas is Ar, gas flow rate is 45L / min; distance from nozzle to substrate It is 12cm, the moving speed of the nozzle is 0.02m / s, and the required thickness of plasma spraying is completed in a certain direction according to the template; the thickness of the spraying tool is 50mm, the porosity can reach 6%, and the hole diameter ...

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Abstract

The invention discloses a preparation method of a mechanical machining tool, and belongs to the technical field of manufacturing of mechanical machining tools. The preparation method comprises the following steps of preparing a hard alloy type tool or a ceramic tool with the thickness of 1mm-10mm by adopting a thermal spraying technique. By adopting a thermal spraying technique, the mechanical machining tool meeting the tool development trend can be prepared with high efficiency and low cost, and also the hard alloy type tool or the ceramic tool with an uniform tissue structure, high abrasion resistance and oxidation resistance and good high-temperature red hardness can be prepared on a corresponding template, wherein the material of the obtained tool can be formed by a single material, and also can be prepared from multiple layers of different materials in a combined spraying mode; the obtained tool can be subjected to corresponding secondary thermal treatment (such as carburization, nitridation, high-temperature sintering) or subjected to coating cladding, or can be obtained by directly processing. The tool prepared by the technique has good self-lubricating capability and self-chipping property as well as relatively high hardness and toughness, thereby prolonging the service life of the tool and improving the machining efficiency of the tool.

Description

Technical field [0001] The invention relates to a method for preparing a machining tool, belonging to the technical field of machining tool manufacturing. Background technique [0002] Commonly used machining tools mainly include cemented carbide tools and ceramic tools. The above two cutting tools are generally made by powder metallurgy, and most of them are composed of a hard phase with a high hardness and melting point and a binder (also called a binder phase). Among them, the hardness of traditional YG and YT series of cemented carbide tools can no longer meet the requirements of high-speed and high-strength processing materials, and impact fractures often occur. In order to improve the performance of cemented carbide tools, in terms of matrix materials, the use of ultrafine grains and gradient alloys and other matrix materials, as well as the addition of other elements and other high-performance cemented carbides, improve the performance of the matrix materials, but in term...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/06C23C4/10C23C4/067C23C4/134
Inventor 宋鹏刘光亮蒋业华周会会黄太红
Owner KUNMING UNIV OF SCI & TECH
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