Diamond coated cutter and application thereof to processing of fiber composite material

Abstract

The invention relates to a diamond coated cutter, which comprises a drill tip, an edge part and a handle part, and is characterized in that: (1) a substrate material is a hard alloy with less than 6 mass percent of Co; (2) the drill tip and the edge part of the cutter are coated with a diamond coating; (3) the head part of the cutter has a drilling and milling integrated structure, the apex angleof the drill tip is double apex angles of 135 degrees and 90 degrees or a disc angle of 5 to 10 degrees, and the thickness of the coated diamond coating is 10 to 30mu m. The coated cutter is manufactured by the following steps of: (1) selecting an appropriate hard alloy substrate material; (2) forming the cutter; (3) pretreating a cutter coating; and (4) preparing the diamond coating on the drilltop and the edge part of the cutter through hot filament chemical vapor deposition (CVD). The phenomena of burrs and obvious surface layer peeling when the coated cutter processes a fiber composite material are avoided.

Description

technical field [0001] The invention relates to a diamond-coated cutting tool and its application. More precisely, the invention provides a cutting tool for processing composite materials such as carbon fiber or glass fiber, which belongs to the technical field of mechanical processing and manufacturing. Background technique [0002] Composite materials are the product of the rapid development of material science in recent years. They have great application space, and can be designed and manufactured according to the requirements of service conditions to meet various special purposes, thus greatly improving the performance of engineering structures. A new contemporary engineering material. Composite materials used in modern engineering structures can be divided into three categories: resin-based, metal-based and ceramic-based according to the type of matrix material. Carbon fiber composite material is a typical resin-based composite material. Its carbon content is generally...

AI Technical Summary

Problems solved by technology

On the processed surface, the carbon fiber is removed by brittle fracture, which can only take away a small amount of heat generated during processing, making the material difficult to plastically deform, poor in heat dissipation, and prone to heat blockage at high temperatures, resulting in carbonization on the surface of the carbon fiber composite material Phenomenon that affects the quality of the machined surface

The cutting heat is mainly transmitted to the tool and the workpiece, resulting in rapid tool wear. Many tools are difficult to complete the entire cutting process of composite material components, which affects the processing efficiency and the accuracy of the workpiece.

[0004] In general, two kinds of defects are prone to occur during the cutting process of composite materials such as carbon fiber and glass fiber: one is incision damage, which is mainly caused by defects such as delamination, tearing, burrs, and wire drawing near the edge of the incision; It is interlayer delamination, which mainly refers to the separation between layers of carbon fiber composite materials, so that the internal structure of the composite material becomes loose, thereby reducing the strength and other properties of the component.

At present, the generally used helical edge overall alloy or high-speed steel end mills, the continuous long cutting edge makes the cutting edge not sharp, which eventually leads to the processing effect of poor cutting performance, low processing efficiency and short tool life, and the continuous long cutting edge The cutting edge is easy to cause unqualified processing phenomena such as burrs, delamination, and peeling on the processed surface

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