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Universal milling force modeling method for uniform plough model

A modeling method and milling force technology, applied in the direction of electrical program control, digital control, etc., can solve problems such as poor versatility

Active Publication Date: 2016-04-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the poor versatility of the existing general milling force modeling method, the present invention provides a general milling force modeling method with a unified plow cutting model

Method used

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  • Universal milling force modeling method for uniform plough model
  • Universal milling force modeling method for uniform plough model
  • Universal milling force modeling method for uniform plough model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) The calibration test adopts 7 groups of down milling experiments, the selected radius R is 8mm, the helix angle β is 32°, and the normal rake angle α n 15°, number of teeth N f A carbide end mill with a value of 3 performs down milling on an aluminum alloy 7050-T7451 in a three-coordinate vertical machining center. Calibration test parameters are tool spindle speed 1000RPM, single tooth feed f is 0.03, 0.05, 0.08, 0.10, 0.12, 0.15, 0.18mm / tooth, axial depth of cut a p Equal to 2mm, radial depth of cut a e Equal to 8mm.

[0056] (2) After the tool is installed, use a dial indicator to measure the deviation between the blade at different axial positions and the rotation center of the tool spindle. Based on this deviation data, refer to figure 1 , to calibrate the tool eccentricity parameters ρ and λ. ρ represents the offset between the tool rotation center O' and the tool geometric center O, and λ represents the angle between the direction of tool eccentricity and...

Embodiment 2

[0081] (1) The verification test selected the radius R as 6mm, the helix angle β as 31°, and the normal rake angle α n 15.5°, number of teeth N f A carbide end mill with a value of 3 performs down milling on an aluminum alloy 7050-T7451 in a three-coordinate vertical machining center. Calibration test parameters are tool spindle speed 1300RPM, single tooth feed rate f is 0.1mm / tooth, axial depth of cut a p Equal to 4mm, radial depth of cut a e equal to 6mm.

[0082] (2) After the tool is installed, use a dial indicator to measure the deviation between the blade at different axial positions and the rotation center of the tool spindle. Based on this deviation data, refer to figure 1 , to calibrate the tool eccentricity parameters ρ and λ. The results were ρ=0.009mm, λ=62.1°.

[0083](3) According to the cutting parameters set in step (1) and measuring the milling force, it is required that the machined surface of the workpiece is perpendicular to the axis of the tool. use ...

Embodiment 3

[0101] Adopt the shear force coefficient K that calibration obtains in embodiment 2 Ts , K Rs , K As , Coefficient of plowing force K sp,T , K sp,R , K sp,A , brought into literature 3 "C.Eksioglu, Z.M.Kilic, Y.Altintas, Discrete-time prediction of chatterstability, cutting forces, and surface location errors inflexible milling systems, Transactions of the ASME Journal of Manufacturing Science and Engineering 134 (2012) 061006" to obtain the stability prediction algorithm of leaflets considering cutting damping The results are shown and verified experimentally. From Figure 4 It can be seen that the stable cutting process obtained by the experimental test is basically located in the stable region below the lobe diagram, the experimentally determined critical stable cutting is in the area near the lobe diagram, and the measured flutter cutting is basically located in the unstable region above the lobe diagram. It shows that the predicted results are in good agreement with...

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Abstract

The invention discloses a universal milling force modeling method for a uniform plough model, which solves the technical problem in the prior art that existing universal milling force modeling methods are poor in versatility. According to the technical scheme of the invention, the ploughing force is uniformly expressed as the product of the ploughing force factor multiplied by the volume of the extruded material. Meanwhile, the ploughing force is separated, so that the influence of the ploughing effect on the shearing factor is avoided. Firstly, several sets of static milling experiments are conducted, and the data of the milling force are recorded. Secondly, the milling force measured in a cartesian coordinate system is converted into the milling force in a milling cutter local coordinate system, and the value of the ploughing force in the local coordinate system is determined through the linear regression method. Thirdly, the factor of the milling force is calculated through separating the shearing force from the milling force, and then is compared with an experimentally measured value. Through the repeated iteration process, the data of the shear angle and the data of a normal friction angle are obtained, and then the factor of the shearing force is determined. Therefore, the factor of the ploughing force is determined based on the separated ploughing force and the determined volume of the static extruded material. By adopting the uniform plough model, whether the cutting process is stable or not no longer needs to be judged. Therefore, the method is good in versatility.

Description

technical field [0001] The invention relates to a general milling force modeling method, in particular to a general milling force modeling method with a unified plow cutting model. Background technique [0002] Document 1 "E.Budak, Y.Altintas, E.J.A.Armarego, Predictionofmillingforcecoefficientsfromorthogonalcuttingdata, JournalofManufacturingScienceandEngineering-TransactionsoftheASME118 (1996) 216-224." The shear force is expressed as a proportional function of the chip width, and the proportional coefficient (edge ​​force coefficient) is empirically determined by linear regression method, and the plow cutting force is expressed as the product of the edge force coefficient and the chip width. [0003] Document 2 "Y. Altintas, M. Eynian, H. Onozuka, Identification of dynamic cutting force coefficients and chatter stability with process damping, Annals of the CIRP 57 (2008) 371-374." discloses a dynamic plow shear force calculation model, the model will plow shear force in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/19
CPCG05B19/19
Inventor 万敏马颖超冯佳张卫红
Owner NORTHWESTERN POLYTECHNICAL UNIV
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