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A negative rake angle milling cutter for c/sic composite milling

A technology of milling processing and composite materials, which is applied in the direction of cutting tools for milling machines, milling cutters, metal processing equipment, etc., can solve the problems of poor processing quality, tool wear, delamination and tearing, etc., to reduce burrs and delamination Phenomenon, anti-breakage tool life, and the effect of excellent cutting performance

Active Publication Date: 2018-02-27
BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Grinding can obtain better precision and surface quality, but the processing efficiency is low
However, there are often two problems in processing this type of composite materials by cutting methods: one is serious tool wear, and the other is poor processing quality.
When processing C / SiC composite materials, the tool is prone to chipping and wears quickly, while the composite material itself is prone to defects such as delamination and tearing
[0004] The main reasons for such processing defects are: (1) C / SiC composite material is an anisotropic material with low strength in the direction perpendicular to the fiber layup
(2) During processing, when the force Fz perpendicular to the direction of the fiber layup is large, the stress generated by the cutting force exceeds the interlayer bonding strength, resulting in delamination and tearing, and the greater the axial force, the more serious the processing defect

Method used

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  • A negative rake angle milling cutter for c/sic composite milling

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, an end mill for milling of C / SiC composite materials is composed of: a tool handle 1, the tool handle is used for installing a knife neck 2 of a blade, and the knife neck has two blades The installation groove 3, the blade 4 is installed in the blade installation groove. The tool handle is used to connect the spindle of the machine tool, and the blade is mounted on the tool handle with screws, on which PCD is welded for cutting.

[0019] The edge shape of the end mill is a negative rake angle, the number of teeth of the milling cutter is 1-2, and the helix angle is 30°.

Embodiment 2

[0021] The invention is used for high-efficiency milling of C / SiC composite materials. Before processing, install the blade on the handle with screws to ensure good contact between the PCD blade and the mounting groove. After assembly, it should be ensured that the radial runout tolerance of the top of the PCD insert cutting edge is within 0.03mm, and the end face circular runout tolerance of the side is within 0.02mm.

[0022] During the use of the present invention, when the cutting edges of individual PCD blades are blunted or chipped, a screwdriver can be used to remove the worn PCD blades and replace them with new PCD blades. When the accuracy requirements are not too high, the wear or edge chipping of individual inserts does not need to be replaced when the cutting performance has little effect. When the PCD blade wears a lot and needs to be replaced, the PCD blades can be replaced and adjusted one by one.

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Abstract

The invention provides a negative rake milling cutter for milling carbon fiber enhanced silicon carbide ceramic matrix (C / Si) composite materials. The negative rake milling cutter comprises a cutter handle, a cutter neck part used for mounting blades, two blade mounting grooves in the cutter neck part and the PCD blades in the blade mounting grooves, wherein the cutter neck part is mounted on the cutter handle. By adopting the negative rake milling cutter, axial cutting force generated in the cutting process can be reduced through specific cutting angles and helix angles, burrs and the layering phenomenon are reduced as far as possible, and meanwhile the abrasion resistance of the cutter is improved. The machining efficiency and quality of the C / Si composite materials can be improved by means of the negative rake milling cutter.

Description

technical field [0001] The invention belongs to the field of milling processing of composite materials, and in particular relates to a negative rake angle milling cutter suitable for milling processing of carbon fiber reinforced silicon carbide ceramic matrix composite material (C / SiC). Background technique [0002] Carbon fiber reinforced silicon carbide ceramic matrix composite (C / SiC) combines the superior mechanical properties of carbon fiber and the good chemical and thermal stability of silicon carbide ceramic matrix, with low density, good oxidation resistance, corrosion resistance, good friction and wear properties As well as the advantages of high temperature resistance, it has become a potential thermal structural material and has been widely used in the fields of national defense and aerospace. For example, the application of C / SiC composite materials to components such as brake pads / flaps of the NASA X-series aerospace test machine has significantly reduced the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23C5/00
CPCB23C5/00B23C2210/0485B23C2222/28B23C2226/27
Inventor 郑景珍姜涛林琳苏宏华
Owner BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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