CN106312156A - Cutting angle acquiring method for restraining milling burr of carbon fiber laminate - Google Patents

Cutting angle acquiring method for restraining milling burr of carbon fiber laminate Download PDF

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Publication number
CN106312156A
CN106312156A CN201611007899.5A CN201611007899A CN106312156A CN 106312156 A CN106312156 A CN 106312156A CN 201611007899 A CN201611007899 A CN 201611007899A CN 106312156 A CN106312156 A CN 106312156A
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carbon fiber
cutting angle
burr
milling
fiber layer
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CN106312156B (en
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陈雪梅
刘洪�
刘蕾
丁国富
江磊
孙剑颖
肖海
方丁
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Chengdu Aircraft Industrial Group Co Ltd
Southwest Jiaotong University
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Chengdu Aircraft Industrial Group Co Ltd
Southwest Jiaotong University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/13—Surface milling of plates, sheets or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2220/00—Details of milling processes
    • B23C2220/04—Milling with the axis of the cutter inclined to the surface being machined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/27—Composites, e.g. fibre reinforced composites

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

The invention discloses a cutting angle acquiring method for restraining milling burr of a carbon fiber laminate. The method comprises the following steps: constructing a calculating model for milling burr and cutting force angle of the carbon fiber laminate; acquiring the cutting angle with the cutting force parallel to a carbon fiber layer; accordingly designing an orthogonal experiment for comparing the burr defect under an appointed technical condition; selecting the cutting angle for effectively restraining the milling burr of the carbon fiber laminate. According to the method provided by the invention, the structure modification for machine tool is not required and the method has the advantages of simple and convenient operation, high calculation efficiency and high practicability.

Description

A kind of cutting angle acquisition methods suppressing carbon fiber layer plywood Technology of Face Milling Burr
Technical field
The present invention relates to carbon fiber Test of Laminate Composites Milling Process field, be specifically related to a kind of suppression carbon fiber lamination The cutting angle acquisition methods of plate Technology of Face Milling Burr.
Background technology
Carbon fiber layer plywood has high specific strength, high ratio modulus, corrosion resistance is strong, density is little and excellent fatigue resistance Having advantage etc. many, at present in aircraft manufacture technology, the application of carbon fiber layer plywood has become as a kind of trend.This material The feature of heterogeneous multilamellar determines its particularity, different from other Single Phase Metal materials, is machined with relatively for this material Big difficulty, its processing characteristic mainly has following several respects: 1) it is a kind of multiphase solid material with hierarchy, every layer Shearing and bending strength between prepreg are relatively low, the defects such as layering easily occur man-hour adding；2) it is by many due to this material Layer prepreg forms according to different fiber angles layings, so it is a kind of Inhomogeneous wave fields, shows on material property Anisotropy, when cutting, cutter cuts the reinforcing material of resin base material and carbon fiber simultaneously, so in working angles, can very The situation that fiber is pulled off easily occurs, produces burr phenomena；3) hardness of this material is the highest, and has good resisting fatigue And abrasion resistance properties, meanwhile, its heat conductivility extreme difference, add and can produce substantial amounts of heat man-hour, and be easily collected at cutting It is difficult to dissipation, so adding man-hour, process tool can be caused bigger abrasion, and the heat produced is also possible to material list Face is caused and is burnt.
The milling technology of carbon fiber layer plywood is studied by domestic and international many scholars.Bi Mingzhi et al. is by unidirectional The cutting of carbon fiber layer plywood carries out experimentation, finds the machining table when machine direction angle is parallel with tool motion direction Face is best in quality.Dalian University of Technology Li Zhi is triumphant et al. is carried out cutting force and Surface Quality aspect respectively to machine direction Research, finds that cutting force reaches maximum when fiber angles is 45 °.Surface quality aspect, the work when machine direction angle is 0 ° Part surface quality is best, and when machine direction angle is 45 °, surface of the work burr is the most serious.Nayak and Bhatnagar etc. are not to Studied with the carbon fiber layer plywood of material property, found the most often occur in mechanical processing process at carbon fiber layer plywood Quality problems be pull-out and the destruction of fiber.
Being both for machine direction currently for the research overwhelming majority of carbon fiber layer plywood to carry out, result of study shows milling Cut direction of feed and fiber bundle direction at an angle time, preferable milling quality can be obtained.This milling requires the institute of material There is fibre bundle paving to keeping consistent, this processing could be realized by work in-process.But in practical engineering application, carbon fiber layer plywood The machine direction of every layer is different, when milling, it is impossible to the fiber angles meeting every layer is ideal state, needs from improving milling The mode cutting state suppresses cutting burr.
Summary of the invention
The technical problem to be solved is to provide a kind of cutting angle suppressing carbon fiber layer plywood Technology of Face Milling Burr Acquisition methods, by changing the angular relationship of cutter and laminate, it is achieved milling state optimization, adds with the suppression of this processing method The burr produced in work, it is not necessary to lathe is carried out structure of modification, have easy to operate simply, computational efficiency is high, and practicality is good Etc. advantage.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of cutting angle acquisition methods suppressing carbon fiber layer plywood Technology of Face Milling Burr, comprises the following steps:
Step 1: build the relational model of Technology of Face Milling Burr and cutting force angle, calculates cutting force and is parallel to cutting of carbon fiber layer Top rake degree；Step 2: on the basis of the cutting angle calculating gained, designs cutting angle single factor test orthogonal experiment, measures milling hair The greatest length of thorn and probability of occurrence；Step 3: contrasted by experimental result, chooses under specified processing condition, can effectively suppress carbon The cutting angle of fiber parameter Technology of Face Milling Burr.
Further, by calculating theoretical cutting angle so that cutting force is parallel to carbon fiber layer.
Further, by carrying out the orthogonal experiment on the basis of desired cut angle, to the hair under specified processing condition Thorn defect contrasts, and by the theoretical method combined with experiment, chooses effective milling cutting angle, suppresses carbon fiber layer Plywood Technology of Face Milling Burr.
Further, step 4 is also included: use the cutter side degree of tilt calculated to carry out checking test, obtain cutter side Incline the method for milling effectiveness to burr suppression in carbon fiber Test of Laminate Composites milling.
Compared with prior art, the invention has the beneficial effects as follows: process carbon fiber Test of Laminate Composites time, cutter in The inclination milling of certain angle, has more active influence to avoiding the aspect such as burr and reduction defect length.Roll angle beta to exist Level off to a certain numerical value of cutter helixangleθ time obtain best cutting result.The determination of optimal angle of heel β value needs combination to refer to The cutter determining operating mode and use carries out test determination.
Accompanying drawing explanation
Fig. 1 is carbon fiber layer board structure schematic diagram.
Fig. 2 is that carbon fiber layer plywood milling is analyzed.
Stress schematic diagram when Fig. 3 is the cutting of carbon fiber layer plywood.
Fig. 4 is the milling mode explanation cutting angle β ＞ 0 °.
Fig. 5 is the milling mode explanation in cutting angle β=0 °.
Fig. 6 is the veining defect length accounting of different cutting angle.
Fig. 7 is the longest burr length of different cutting angle.
Fig. 8 is cutter side inclination angle milling effect enlarged drawing when being respectively 0 °.
Fig. 9 is cutter side inclination angle milling effect enlarged drawing when being respectively 20 °.
Detailed description of the invention
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings, and the inventive method includes structure Build the relational model of Technology of Face Milling Burr and cutting force angle, calculate cutting force and be parallel to the cutting angle of carbon fiber layer.Carbon fiber layer Plywood is to be formed according to different machine direction layings by the prepreg of multilamellar, and prepreg is by reinforcing material carbon fiber and matrix material Material resin compounded forms, and its structure is as shown in Figure 1.
The milling process of carbon fiber layer plywood is as shown in Figure 2.It can be seen that due to the relation of the helical angle of cutter own, During cutter tooth cutting material, the Milling Force that material is subject to is F, and its direction is perpendicular to the rake face of cutter tooth, is broken down into along cutter The F of direction of feed1With the F being perpendicular to surface of the work2.Under this milling mode, F1There is provided effective shearing force in order to cut off carbon Fiber, component F2Existence workpiece can be made longitudinally to produce vibration, thus affect milling quality.In order to obtain more preferable milling matter Amount, it is desirable to increase F in milling process as far as possible1And reduce F2。
In formula: θ is cutter helical angle.
Cutter rolls milling and refers to that cutter keeps a clamp in the normal plane of cutter path and between cutter path normal direction Angle carries out the method for milling.Stressing conditions when Fig. 3 is to roll milling state bottom tool cutting carbon fiber layer plywood.Cut at cutter tooth When cutting material, the Milling Force that material is subject to is F', and its direction is perpendicular to the rake face of cutter tooth, is broken down into along tool feeding side To F1' and be perpendicular to the F of surface of the work2', thus can obtain:
Thus formula it can be seen that along with roll angle beta increase, F1' constantly increase, F2' constantly reduce.As β=θ, F1' reach maximum, F2' minimize, reach optimum milling state the most in theory.Therefore, in order to suppress cutting burr, Ask in milling process, increase F as far as possible1And reduce F2, i.e. the cutting angle of Theoretical Calculation is β=θ.
On the basis of the cutting angle calculating gained, design cutting angle single factor test orthogonal experiment, measure Technology of Face Milling Burr Greatest length and probability of occurrence.On the basis of the machining angle β calculating gained, design according to single factor test orthogonal experiment design Orthogonal experiment.Operating condition of test is formulated according to actual actual production operating mode, and orthogonal design table is as shown in table 1.
Table 1 cutting angle orthogonal experiment
Sequence number Lathe rotating speed (n) Feed speed (f) Radially cutting-in (ae) Side tilt angle (β)
1 n f ae 0°
2 n f ae θ-25°
3 n f ae θ-20°
4 n f ae θ-15°
5 n f ae θ-10°
6 n f ae θ-5°
7 n f ae θ
8 n f ae θ+10°
The difference suggestion of the side tilt angle level value in table 1 chooses 5 °, can find relatively with the fewest test number (TN) For preferable angle value, it is also possible to reducing according to actual requirement or increase this difference, difference is the least, and workload is the biggest, The precision arrived is the highest.Difference is the biggest, and workload is the least, and precision is the lowest.After completing test, use digital multimeter tool microscope In the case of amplifying 50 times, measure greatest length and the probability of occurrence of Technology of Face Milling Burr.(note: can be according to concrete testing equipment Situation improves amplification, to provide accurate measuring condition)
The greatest length of burr is directly measured by digital multimeter tool microscope, and burr probability of occurrence passes through following formula meter Calculation gained:
Contrasted by experimental result, choose under specified processing condition, can effectively suppress carbon fiber layer plywood Technology of Face Milling Burr Cutting angle, arranges the result of the test recorded as shown in table 2.
Table 2 result of the test
By result of the test is carried out icon analysis, find the cutting angle effectively suppressing burr being suitable for specifying operating mode.
Table 3 is by the micro-measurement result to side tilt angle milling test specimen of digital multimeter instrument.
Table 3 result of the test
Fig. 6 to Fig. 9 is the angle explanation to defect suppression situation.It can be seen that rationally select cutting angle to burr Suppression have obvious effect, indicate effectiveness of the invention.

Claims (4)

1. the cutting angle acquisition methods suppressing carbon fiber layer plywood Technology of Face Milling Burr, it is characterised in that comprise the following steps:
Step 1: build the relational model of Technology of Face Milling Burr and cutting force angle, calculates cutting force and is parallel to the cutting angle of carbon fiber layer Degree；
Step 2: on the basis of the cutting angle calculating gained, designs cutting angle single factor test orthogonal experiment, measures Technology of Face Milling Burr Greatest length and probability of occurrence；
Step 3: contrasted by experimental result, chooses under specified processing condition, can effectively suppress carbon fiber layer plywood Technology of Face Milling Burr Cutting angle.
A kind of cutting angle acquisition methods suppressing carbon fiber layer plywood Technology of Face Milling Burr the most as claimed in claim 1, its feature It is, by calculating theoretical cutting angle so that cutting force is parallel to carbon fiber layer.
A kind of cutting angle acquisition methods suppressing carbon fiber layer plywood Technology of Face Milling Burr the most as claimed in claim 1 or 2, it is special Levy and be, by carrying out the orthogonal experiment on the basis of desired cut angle, the veining defect under specified processing condition is carried out Contrast, by the theoretical method combined with experiment, chooses effective milling cutting angle, suppresses carbon fiber layer plywood milling hair Thorn.
A kind of cutting angle acquisition methods suppressing carbon fiber layer plywood Technology of Face Milling Burr the most as claimed in claim 1 or 2, it is special Levy and be, also include step 4: use the cutter side degree of tilt calculated to carry out checking test, obtain cutter and roll method for milling The effectiveness in carbon fiber Test of Laminate Composites milling, burr suppressed.
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Cited By (7)

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CN108380949A (en) * 2018-01-29 2018-08-10 上汽通用五菱汽车股份有限公司 A kind of bent axle milling process
CN108393521A (en) * 2018-02-01 2018-08-14 大连理工大学 A kind of preferred method of carbon fibre composite along upmilling processing method
CN110347963A (en) * 2019-07-10 2019-10-18 上海理工大学 The calculation method of micro- minimum reciprocating feed number of milling Compound Machining
CN110889149A (en) * 2019-10-12 2020-03-17 大连理工大学 Method for predicting burr length of fiber reinforced composite material machined by fillet cutter
CN112139573A (en) * 2020-08-21 2020-12-29 成都飞机工业（集团）有限责任公司 Numerical control machining method for preventing sharp corner of carbon fiber part from layering
CN113727796A (en) * 2019-04-18 2021-11-30 杰富意钢铁株式会社 Method for finishing surface of slab
CN114850547A (en) * 2022-07-11 2022-08-05 成都飞机工业（集团）有限责任公司 Carbon fiber member contour milling damage inhibition method

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108380949A (en) * 2018-01-29 2018-08-10 上汽通用五菱汽车股份有限公司 A kind of bent axle milling process
CN108393521A (en) * 2018-02-01 2018-08-14 大连理工大学 A kind of preferred method of carbon fibre composite along upmilling processing method
CN108393521B (en) * 2018-02-01 2019-04-23 大连理工大学 A kind of preferred method of carbon fibre composite along upmilling processing method
CN113727796A (en) * 2019-04-18 2021-11-30 杰富意钢铁株式会社 Method for finishing surface of slab
CN110347963A (en) * 2019-07-10 2019-10-18 上海理工大学 The calculation method of micro- minimum reciprocating feed number of milling Compound Machining
CN110347963B (en) * 2019-07-10 2023-07-07 上海理工大学 Method for calculating minimum reciprocating feeding times of micro-milling and grinding combined machining
CN110889149A (en) * 2019-10-12 2020-03-17 大连理工大学 Method for predicting burr length of fiber reinforced composite material machined by fillet cutter
CN110889149B (en) * 2019-10-12 2021-04-20 大连理工大学 Method for predicting burr length of fiber reinforced composite material machined by fillet cutter
CN112139573A (en) * 2020-08-21 2020-12-29 成都飞机工业（集团）有限责任公司 Numerical control machining method for preventing sharp corner of carbon fiber part from layering
CN112139573B (en) * 2020-08-21 2022-06-14 成都飞机工业（集团）有限责任公司 Numerical control machining method for preventing sharp corner of carbon fiber part from layering
CN114850547A (en) * 2022-07-11 2022-08-05 成都飞机工业（集团）有限责任公司 Carbon fiber member contour milling damage inhibition method
CN114850547B (en) * 2022-07-11 2022-10-25 成都飞机工业（集团）有限责任公司 Carbon fiber member contour milling damage inhibition method

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