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Coating end milling cutter for graphite die machining and preparation method of coating end milling cutter

A technology for graphite molds and end mills, which is applied in metal processing equipment, milling cutters, milling machine equipment, etc., can solve the problems of diamond film coating thickness and graphite processing surface roughness, etc., so as to improve processing efficiency and processing surface Quality, improved surface finish, long working life effect

Active Publication Date: 2017-12-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] After searching the literature of the prior art, it was found that the Chinese Utility Model Patent (CN 205167262 U) "Diamond Coated Tool Applied in Graphite High Speed ​​Machining" discloses the front and back angles of the bottom edge and back angle of the diamond coated tool for graphite processing, and the peripheral edge The range of degrees of front and back angles and helix angles, but there are few descriptions of the length of the bottom edge and chip flutes directly used in planar graphite milling, as well as the deposition process of diamond films, coating thickness and surface roughness of graphite machining

Method used

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  • Coating end milling cutter for graphite die machining and preparation method of coating end milling cutter
  • Coating end milling cutter for graphite die machining and preparation method of coating end milling cutter
  • Coating end milling cutter for graphite die machining and preparation method of coating end milling cutter

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Embodiment 1

[0042] The schematic diagram of the appearance of the coated end mill used in this embodiment is as follows figure 1 and figure 2 and image 3As shown, the diameter a is 6mm, the total length e is 50mm, the length of the cutting part is 8mm, the length of the three short bottom edges is 2mm, and the length of one long bottom edge is 2.82mm, and the long bottom edge passes through the bottom surface of the end mill. At the center of the circle, the remaining three short bottom edges do not pass through the center of the bottom surface of the end mill. The width of the flute between the long and short bottom edges is 1.3mm, the rake angle of the bottom edge is 5°, and the rear angle of the bottom edge is 7° , with a helix angle of 25°. The base material of the tool is cemented carbide with a cobalt content of 6%, and the particle size of the tungsten carbide is 1 micron.

[0043] Put the end mill sharpened by the five-axis CNC grinder in a vertical rotary tool passivation de...

Embodiment 2

[0054] The diameter of the coated end mill used in this embodiment is 8mm, the length f of the cutting part is 8mm, and it has three short and one long bottom edges, the length of the long bottom edge is 4.1mm, and the length of the three short bottom edges is 2.48mm, of which The long bottom edge passes through the center of the bottom surface of the end mill, and the other three short bottom edges do not pass through the center of the bottom surface of the end mill. The width of the flute between the long bottom edge and the short bottom edge is 1.36mm; the rake angle of the bottom edge is 7°, the bottom edge relief angle is 12°, and the helix angle is 45°. After the end mill with a diameter of 8 mm is passivated, the radius of the cutting edge of the bottom edge is 20 μm.

[0055] Soak the cemented carbide substrate in the Murakami solution for 30 minutes of ultrasonic cleaning, which breaks the tungsten carbide (WC) particles on the surface of the cemented carbide and caus...

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Abstract

The invention discloses a coating end milling cutter for graphite die machining and a preparation method of the coating end milling cutter. The coating end milling cutter is characterized in that the unique end cutting edge length distribution is achieved, one long end cutting edge passes through the circle center of the bottom face of the end milling cutter, three short end cutting edges do not pass through the circle center of the bottom face of the end milling cutter, enough chip removal space is reserved among the end cutting edges, and the front angles and the rear angles of the end cutting edges and the helical angle of a cutting edge are reasonable. The optimal cutting edge arc radius for ensuring the coating bonding strength and the cutting edge strength at the same time is achieved. After the surface layer of the end milling cutter is subjected to acid-base two-step chemical pretreatment by a Murakami solution and a Caro mixed acid solution, and a micro-nano compound alloy diamond film with the tough bottom layer, smooth surface layer and even and reasonable film thickness is coated by a chemical vapor deposition method. Compared with a traditional hard alloy end milling cutter, the coating end milling cutter can meet the use requirement of mobile phone glass for the surface finish degree of a hot bending graphite die, remarkably prolongs the service life of the cutter and remarkably improves the machining surface finish degree of the graphite die.

Description

technical field [0001] The invention relates to a coated end mill for processing graphite molds and a preparation method thereof, in particular to a coated end mill for processing graphite molds for hot-bending mobile phone glass and a preparation method thereof, belonging to the technical field of cutting tools . Background technique [0002] In recent years, smartphone styles have continued to evolve. As a major selling point, the curved screen technology of mobile phones is becoming more and more widely used. A variety of curved screen mobile phones, such as Samsung Galaxy S8 / S8+, Vivo Xplay6, etc., have been successfully launched and are unanimously favored by users. According to reliable sources, the Apple Apple 8 mobile phone will also use a curved screen. Therefore, it can be seen that mobile phones with curved screens will become one of the development trends of mobile phones in the future, and glass with curved screens for mobile phones has broad market applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23C5/06B23P15/34
CPCB23C5/06B23C2200/165B23C2200/32B23P15/34
Inventor 雷学林何云刘晋
Owner EAST CHINA UNIV OF SCI & TECH
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