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Carbon dioxide laser machining method of PCBN and carbon dioxide laser machining device of PCBN

A laser processing method and carbon dioxide technology, applied in the field of hard and brittle materials processing, can solve the problems of low ultrasonic cutting efficiency, low cutting efficiency, and poor processing quality, so as to reduce the formation of heat-affected zone and recasting layer and improve efficiency , Improve the effect of surface roughness

Active Publication Date: 2018-07-24
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen from Table 1 that the diamond grinding wheel cutting method is simple, but the processing quality is poor and the product qualification rate is low; the high-pressure water jet will cause a lot of water pollution during the cutting process, the cost of mechanical maintenance is high, and the cutting efficiency is low; the efficiency of ultrasonic cutting is often lower. Low is generally not used; therefore these three processing methods have been gradually replaced by the latter two processing methods
The cutting of PCBN by wire electric discharge cutting is adopted by most cutting tool manufacturers. Since the hard particles contained in PCBN sheets are not conductive, wire electric discharge cutting is difficult and the wire is easily broken.
Later, some scientists at home and abroad have improved the machinability of WEDM by adding conductive additives and increasing the pressure in the PCBN sintering process, but it can only achieve small batch production and production, and material removal Low rate, relatively wide incision, poor surface quality, most PCBNs at home and abroad still cannot be processed; laser cutting highlights the advantages of high processing efficiency and good cutting quality in PCBN processing
However, there are also some problems, such as the formation of a recast layer, the need for secondary grinding of the incision, and the low material removal rate
Therefore, there are problems such as long processing time, large energy consumption, and low efficiency in the current PCBN processing method.

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  • Carbon dioxide laser machining method of PCBN and carbon dioxide laser machining device of PCBN
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  • Carbon dioxide laser machining method of PCBN and carbon dioxide laser machining device of PCBN

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and by specific embodiment the present invention is described in further detail, following embodiment is descriptive only, is not limiting, can not limit protection scope of the present invention with this.

[0023] The present invention uses a carbon dioxide laser, and the structure of the laser head is as follows: figure 1 As shown, it includes a nozzle 1, a rotating disk 2, a separation base 5 and a connection seat 6 that are coaxially connected in sequence, and a laser through hole 4 is coaxially connected to the center of the nozzle, the rotation disk and the separation base. The laser through hole It communicates with the laser through hole 7 of the connecting seat, and the rotating disk is connected with the separation base through the bearing 3 . A plurality of auxiliary gas inlet holes 8 are formed in the connection seat, and the auxiliary gas inlet holes communicate with the laser penetration hole at the center of...

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Abstract

The invention relates to a carbon dioxide laser machining method of PCBN. The surface of a material is cut by utilizing laser, and the generated temperature gradient in the cutting process results inphase change of cubic boron nitride to hexagonal boron nitride, so that great thermal stress and internal stress are caused, and the material produces cracks and propagating cracks in the kerf direction. The machining method is totally different from the traditional laser machining principle; the PCBN laser cutting efficiency is improved effectively; and the forming areas of a heat-affected zone and a recasting layer of the material are reduced, and the roughness of the machined surface is improved.

Description

technical field [0001] The invention belongs to the field of processing hard and brittle materials, and relates to processing PCBN by laser, especially a carbon dioxide laser processing method and processing device of PCBN. Background technique [0002] Polycrystalline cubic boron nitride (Polycrystalline Cubic Boron Nitride) referred to as PCBN is another new type of superhard synthetic material after artificial diamond. PCBN is a cubic boron nitride single crystal with or without various binders (phases) and then processed Isotropic polycrystalline block formed by high temperature and high pressure polymerization and sintering. Diamond tools have always been of high application value in high-speed cutting due to their high hardness, but their chemical properties are unstable, and they are prone to chemical reactions with iron and other metals to cause tool breakage, and the cost is relatively high. The hardness of PCBN is second only to diamond. Unlike diamond, its cost i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/364B23K26/12B23K26/402B23K101/20
CPCB23K26/123B23K26/364B23K26/402
Inventor 赵静楠郭健马晓磊司学康
Owner TIANJIN UNIV OF SCI & TECH
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