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Batch preparation method of ultra-nano diamond coated cutting tool with high finish and complex shape

A diamond coating, high finish technology, applied in metal material coating process, coating, gaseous chemical plating and other directions, can solve the problem that the surface finish of the tool cannot meet the requirements of machining accuracy and tool life, and the surface roughness of the diamond coating High problems, to achieve the effect of low surface roughness, improved machining accuracy and tool life, and high machining accuracy

Active Publication Date: 2020-09-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface roughness of the diamond coating deposited by the above technology is still high, and the surface finish of the tool can no longer meet the requirements for machining accuracy and tool life in the precision machining of difficult-to-machine materials.

Method used

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  • Batch preparation method of ultra-nano diamond coated cutting tool with high finish and complex shape
  • Batch preparation method of ultra-nano diamond coated cutting tool with high finish and complex shape
  • Batch preparation method of ultra-nano diamond coated cutting tool with high finish and complex shape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 105 cemented carbide milling cutters for graphite processing (blade diameter 4mm, blade length 20mm, shank diameter 4mm, total length 75mm) were pretreated, that is, "potassium permanganate solution was oxidized for 20 minutes to roughen the surface of the cemented carbide, The mixed solution of concentrated hydrochloric acid and hydrogen peroxide is etched for 30 seconds to remove cobalt from the surface of the cemented carbide, placed in a suspension of nano-sized diamond micropowder to uniformly plant crystals on the surface of the tool, and placed in acetone for ultrasonic cleaning. Then, place the pretreated 105 milling cutters in the reaction chamber of the HFCVD equipment, figure 1 Schematic diagram of the layout of hot wires for high-gloss ultra-nano-diamond film-coated tools prepared in batches for HFCVD, where methane and hydrogen are fed in. The flow rates of methane and hydrogen are 160sccm and 800sccm respectively, the air pressure is 800Pa, the number of ho...

Embodiment 2

[0048] 140 tungsten carbide micro-drills (blade diameter 0.3mm, blade length 8mm, shank diameter 3.175mm, total length 38mm) for the processing of printed circuit boards (PCB) were pretreated, that is, "potassium permanganate solution was oxidized for 10 minutes to make Roughen the surface of the cemented carbide, etch with a mixed solution of concentrated hydrochloric acid and hydrogen peroxide for 8 seconds to remove cobalt from the surface of the cemented carbide, place it in a suspension of nano-sized diamond micropowder and perform ultrasonic oscillation on the surface of the tool, and place it in acetone for ultrasonication Cleaning" process. Then, 140 PCB micro-drills after pretreatment were placed in the reaction chamber of the HFCVD equipment, and two gas paths were set up, 300 sccm pure hydrogen gas was passed into one gas path, and 250 sccm carrying hydrogen gas was passed into the other gas path. Introduce the mixture of acetone and trimethyl borate in the bubble b...

Embodiment 3

[0050] 90 cemented carbide milling cutters for graphite processing (blade diameter 6mm, blade length 15mm, shank diameter 6mm, total length 50mm) were pretreated, that is, "potassium permanganate solution was oxidized for 20 minutes to roughen the surface of the cemented carbide, The mixed solution of concentrated hydrochloric acid and hydrogen peroxide is etched for 30 seconds to remove cobalt from the surface of the cemented carbide, placed in a suspension of nano-sized diamond micropowder to uniformly plant crystals on the surface of the tool, and placed in acetone for ultrasonic cleaning. Then, 80 graphite milling cutters after pretreatment were placed in the reaction chamber of the HFCVD equipment. 0mm, two channels of gas (methane and hydrogen) are introduced. The deposition is divided into 4 stages: the first stage is the nucleation stage, the methane flow rate is 40sccm, the hydrogen flow rate is 900sccm, the air pressure is 1100Pa, and the time is 30min; the second st...

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Abstract

The invention discloses a batch preparation method of an ultra-nano diamond coated tool with high finish and a complex shape. An HFCVD process is used to deposit a layer of undoped or boron-doped ultra-nano diamond film on the surface of a pretreated complex-shaped cemented carbide tool. The pretreatment method is "surface roughening + surface cobalt removal + uniform crystal planting". The raw materials for the HFCVD process of the undoped ultra-nano diamond film are hydrogen and methane. The HFCVD process of the boron-doped ultra-nano diamond film uses a bubbling method. Hydrogen is used asa carrier to send a mixed liquid of trimethyl borate and acetone to the HFCVD reaction cavity, and the trimethyl borate and acetone are decomposed at high temperature to deposit a layer of boron-dopedultra-nano diamond film on the surface of a tool substrate. The batch preparation method can obtain the undoped or boron-doped ultra-nano diamond film coated tools with extremely high surface finish,extremely low surface roughness, and extremely small friction coefficient, can be applied to precision and ultra-precision cutting processing, and not only can improve the processing accuracy, but extend the service life of the tool.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to a method for preparing a high-gloss and complex-shaped supernano-diamond-coated tool; in particular, it is a method for improving the surface finish, machining accuracy and service life of the diamond-coated tool. Background technique [0002] Chemical vapor deposition (Chemical Vapor Deposition, CVD) diamond film has excellent properties such as hardness very close to natural diamond, high elastic modulus, high thermal conductivity, good self-lubrication and chemical stability. Deposit diamond film on the surface of cemented carbide tools to prepare diamond film coated tools, which are applied to cutting of difficult-to-machine materials such as CFRP, high-silicon aluminum alloy, high-performance graphite, zirconia ceramics, etc., which can prolong tool life and improve production efficiency. Significantly improve the quality of processed products, save raw materials...

Claims

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Application Information

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IPC IPC(8): C23C16/27C23C16/02
CPCC23C16/278C23C16/277C23C16/271C23C16/0227
Inventor 王华孙方宏
Owner SHANGHAI JIAO TONG UNIV
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