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CFRP low-damage sliding cutting method and drilling bit

A cutting method and low-damage technology, applied in the field of machining, which can solve the problems of poor surface quality, sub-surface damage, micro-crack damage, etc.

Active Publication Date: 2021-12-28
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a CFRP low-damage sliding cutting method and hole-making drill bit to solve the problems of poor surface quality, sub-surface damage and micro-crack damage caused by cutting with large fiber direction angles in the above-mentioned traditional hole-making technology And other problems, can further improve the quality of CFRP processing

Method used

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  • CFRP low-damage sliding cutting method and drilling bit
  • CFRP low-damage sliding cutting method and drilling bit
  • CFRP low-damage sliding cutting method and drilling bit

Examples

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Embodiment 1

[0044] This embodiment provides a low-damage sliding cutting method for CFRP, specifically: in addition to feeding along the composite cutting direction, any point on the cutting edge also slides along a direction tangent to the cutting edge to squeeze The CFRP drilling process is completed under the action of sliding and shearing of the cutting edge. Among them, the "synthetic cutting direction" refers to the cutting direction synthesized along the main motion and the feed motion.

[0045]In this embodiment, any point on the cutting edge simultaneously has a velocity v along the cutting direction synthesized by the main motion and the feed motion s1 and the sliding cutting speed v in the direction tangential to the cutting edge s2 .

[0046] In this embodiment, when the CFRP low-damage sliding cutting method is used to drill CFRP, it is preferable that the cutting direction (feeding direction) is perpendicular to any layer in CFRP. Drilling for other materials is also poss...

Embodiment 2

[0052] Such as Figure 5-10 As shown, the present embodiment provides a CFRP low-damage hole-making drill, including a drill body 5, a sliding cutting edge 51 and a drill secondary edge 52, the sliding cutting edge 51 is arranged on the outer wall of the drill body 5, and the sliding cutting edge 51 is along the drill bit. The body 5 is provided with a plurality of axial intervals; the sliding cutting edge 51 is used to provide a sliding shear force tangential to the sliding cutting edge 51; The main body 5 is arranged in multiples at intervals in the axial direction, and any secondary edge 52 of the drill bit is connected with a sliding cutting edge 51 to form a margin 53; the secondary edge 52 of the drill bit is used to provide extrusion force along the feeding direction. The aforementioned CFRP low-damage drilling drill can be used to implement the CFRP low-damage sliding cutting method described in Embodiment 1.

[0053] In this example, if Figure 10 As shown, the dril...

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Abstract

The invention discloses a CFRP (Carbon Fiber Reinforced Plastics) low-damage sliding cutting method, which is characterized in that any point on a cutting edge moves along a synthetic cutting direction and also slides along a direction in which the cutting edge is tangent to the point, so that CFRP cutting processing is completed under the extrusion action of a tool nose and the sliding shearing action of the cutting edge. According to the cutting method, fibers are not only subjected to the same extrusion effect of the tool nose as existing right-angle / oblique-angle cutting, but also mainly subjected to the sliding shearing effect of the cutting edge; under the comprehensive effect of extrusion and sliding shearing of the tool nose, the fibers are more easily cut off, deformation of the fibers before fracture is reduced, and the fracture point is closer to a theoretical position; and finally, higher machining surface precision is achieved, sub-surface damage is effectively controlled, and the fiber fracture position is closer to an expected position. The invention further provides a CFRP low-damage drilling bit, sliding cutting of CFRP can be conducted, the problem of hole wall subsurface damage is solved, the hole diameter precision is improved, and the CFRP machining quality is improved.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and relates to a CFRP material hole-making process, in particular to a CFRP low-damage sliding cutting method and a hole-making drill bit. Background technique [0002] CFRP (full name: Carbon Fiber Reinforced Polymer) is the English abbreviation of carbon fiber reinforced resin-based composite materials. [0003] CFRP laminated structures have been widely used in the aerospace field. For the hole-making process of CFRP materials, the existing methods mainly use tools such as twist drills, dagger drills or other improved drills. Taking the twist drill as an example, its structure is as follows Figure 1~2 As shown, the cutting edge spirals downward to remove material under the main motion and the feed motion. Each layer of CFRP is anisotropic. If a section perpendicular to the axis of the drill bit is made during the drilling process, the main cutting edge is discretely divided into a series...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/54
CPCB29C70/545Y02P70/10
Inventor 孟庆勋刘昊李传钊黄政董猛
Owner SHENYANG AEROSPACE UNIVERSITY