Drill bits used for cfrp machining and the experimental determination method of their structural parameters

A technology for determining the method and structural parameters, which is applied in the field of mechanical processing, can solve the problems that the method for determining the structural parameters of special drilling tools for carbon fiber reinforced composite materials is not found, and the overall optimization effect is not obvious, so as to reduce drilling defects and cutting temperature. Uniform distribution, cutting force and uniform effect

Active Publication Date: 2017-02-15
上海工具厂有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a structure often only optimizes the impact of the extremely small area of ​​the outer circle turning point on the drilling process, and the overall optimization effect is not obvious
[0004] After searching the existing literature, no public reports on the determination method of the structural parameters of special drilling tools for carbon fiber reinforced composite materials have been found so far

Method used

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  • Drill bits used for cfrp machining and the experimental determination method of their structural parameters
  • Drill bits used for cfrp machining and the experimental determination method of their structural parameters
  • Drill bits used for cfrp machining and the experimental determination method of their structural parameters

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Experimental program
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Embodiment

[0085] In this embodiment, a cemented carbide twist drill with a diameter of 12mm is used to drill and process T800CFRP laminates, and the cutting force and cutting temperature distribution on the cutting edge are measured as follows: figure 2 shown. After processing the experimental data, the following fitting formula is obtained:

[0086] F(x)=11.15x 3-12.76x 2 -1.02x+10.84,

[0087] T(x)=-37.77x 3 +44.48x 2 -10.35x+9.33.

[0088] Adopt cutting speed V=200m / min, cutting depth a p =20μm is the experimental parameter, and the orthogonal free cutting experiment of CFRP is carried out, in which the rake angle adopts five levels of 5°, 10°, 15°, 20° and 25°, and the rear angle adopts 5°, 10°, 15°, 20° ° and 25° five levels, the radius of the blunt circle adopts five levels of 5μm, 10μm, 15μm, 20μm and 25μm to measure the cutting force and cutting temperature, and divide the cutting force and cutting temperature by the plate thickness to obtain the cutting force and cuttin...

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Abstract

The invention discloses an experimental determining method for structural parameters of a drill bit for CFRP machining. The method includes the steps of obtaining the distribution of cutting force and cutting temperature on a main cutting edge of the drill bit through a cutting experiment of prefabricated holes of different diameters, obtaining the function relationship between the cutting force, the cutting temperature and the structural parameters of the drill bit through an orthogonal free cutting experiment of CFRP, determining distribution parameter values of the angle of the rear corner of the drill bit and the radius of a blunt circle along the main cutting edge by the utilization of the known angle of a front corner of the drill bit according to the principle of the even distribution of the cutting force and the cutting temperature, and manufacturing the drill bit according to the determined parameter values. According to the drill bit for CFRP machining, in the actual production process of the CFRP, the cutting force and cutting temperature on the main cutting edge are evenly distributed, and drilling defects are reduced.

Description

technical field [0001] The invention relates to a drilling tool, in particular to a drill bit for processing carbon fiber reinforced composite materials (CFRP), and an experimental method for determining its structural parameters based on drilling force and drilling temperature control, belonging to the technical field of mechanical processing . Background technique [0002] Carbon Fiber Reinforced Polymer (CFRP) is a new type of resin-based composite material reinforced with carbon or graphite fibers. It has high strength, high specific stiffness, good fatigue resistance and strong designability. And other advantages, it is widely used in the manufacture of main load-bearing structural parts of advanced aircraft, such as aircraft skin, wall panels, wing middle beams, fuselage bulkheads and doors and other components. In the mechanical cutting of CFRP, drilling is the most widely used and widely used processing method. The quality of drilling holes is directly related to th...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G06F19/00B26F1/16
Inventor励政伟陈明顾立晨邱坤贤安庆龙
Owner上海工具厂有限公司