Method for calculating and testing difference of cuttingbehaviors of tool-workpiece interfaces of left and right cutting edges

A test method and cutting edge technology, applied in the direction of calculation, design optimization/simulation, special data processing application, etc., can solve the problem that there is no test method that can fully reveal the difference of cutting behavior of large-pitch trapezoidal external thread cutting tools.

Active Publication Date: 2017-08-08
HARBIN UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing test methods do not have a test method that can fully reveal the difference in cutting behavior of cutting tools for cutting large-pitch trapezoidal external threads, and then provide calculation and testing for the difference in cutting behavior of the left and right cutting edges. method

Method used

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  • Method for calculating and testing difference of cuttingbehaviors of tool-workpiece interfaces of left and right cutting edges
  • Method for calculating and testing difference of cuttingbehaviors of tool-workpiece interfaces of left and right cutting edges
  • Method for calculating and testing difference of cuttingbehaviors of tool-workpiece interfaces of left and right cutting edges

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Implementation example 1: Hierarchical structure and characteristic variables of tool-worker contact relationship in turning large-pitch thread

[0050] (1) When the left and right edges of the large pitch thread are cut, because the working angle of the tool is different from the marked angle, the total cutting force and cutting stroke of the left and right edges of the tool are different, which will lead to inconsistent machining results of the left and right edges . During the initial cutting, the motion parameter variables of the left and right cutting edges of the tool are shown in Table 1.

[0051] Table 1 The basic variables of the relationship between the cutting motion of the left and right blades of the tool

[0052]

[0053] table, n l is the cutting speed of the left edge, n r is the cutting speed of the right edge, v cl is the main movement speed of the left blade, v cr is the main movement speed of the right blade, v fl is the feed speed of the le...

Embodiment 2

[0087] Implementation Example 2: Calculation method of the left and right knife contact length and knife contact width

[0088] Since the cutting edge and flank of the tool are severely worn during the process of cutting large-pitch threads, the tool-tool contact relationship can be characterized by the attitude of the cutting edge and the state of the flank during each period of cutting.

[0089] According to the initial state of the cutting edge of the tool, take the tool tip as the origin, and follow the right-handed Cartesian coordinate system to establish a rectangular coordinate system composed of x, y, and z axes, where the x direction is the direction of the radial feed speed of the tool, The y direction is the cutting speed direction, and the z direction is the tool axial feed direction. The curve equation F of the left and right edges of the tool in the tool coordinate system can be obtained by Matlab curve fitting l (0) (Z,X) and F r (0) (Z, X), apply coordinate...

Embodiment 3

[0111] Implementation example 3: force model of left and right edge cutting tools

[0112] When the left and right edges of the tool cut large-pitch threads, there are two sources of cutting force: one is the resistance produced by the elastic deformation and plastic deformation of the metal in the cutting layer, chips and the metal on the surface of the workpiece; Frictional resistance between surfaces. When using a forming turning tool to turn a large pitch thread, the force state of the tool is different when the left edge is turned and the right edge is turned. The specific force state is as follows Figure 7 , Figure 8 shown.

[0113] In the figure, F γl , F γr are the frictional forces acting on the rake face of the left and right cutting edges respectively, F αl , F αr are the frictional resistance acting on the flanks of the left and right cutting edges, respectively, F γNl , F αNl are the normal forces acting on the front and flank faces of the left cutting e...

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Abstract

The invention relates to a method for calculating and testing the difference of cutting behaviors of tool-workpiece interfaces of left and right cutting edges, and aims at solving the problem that the existing testing method cannot comprehensively disclose the difference of thecutting behaviors of a cutting large-pitch trapezoid external threaded cutter. The method comprises the following steps: determining the hierarchical structure and the characteristic variable of a tool-workpiece contact relation of a cutting large-pitch thread; calculating and analyzing the tool-workpiece contact length and the tool-workpiece contact width of the left and right edges; establishing left and right edge cutter force tolerance models; using a deformation coefficient and relative slippage calculation method, a shear angle and frictional angle calculation method, and a cutting behavior difference experiment testing method of the left and right cutting edges of the cutter to disclose the states of cuttings of the left and right edges in the cutting, the abrasions of the left and right edges, and the difference of the dynamic cutting behaviors of the left and right edges. The method discloses the states of cuttings of the left and right edges in the cutting, the abrasions of the left and right edges, and the difference of the dynamic cutting behaviors of the left and right edges, so that effective evidences are provided for improving the quality of the machined surface.

Description

technical field [0001] The invention relates to a method for testing the difference in cutting behavior of a tool for cutting large-pitch trapezoidal external thread, in particular to a method for calculating and testing the difference in cutting behavior of the left and right cutting edges of the tool for turning large-pitch trapezoidal external thread. Background technique [0002] As the main component of the press to control the parallelism and perpendicularity of the upper and lower dies, the large-pitch screw has an important impact on the static and dynamic accuracy of the whole machine. During processing, the processing accuracy of the left and right thread surfaces requires high consistency. When turning large-pitch threads, the cutting behavior of the left and right blade tool interfaces is different, which directly affects the surface quality of the left and right thread surfaces and the consistency of the surface quality of the left and right thread surfaces. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20
Inventor 姜彬何田田左林晗赵娇
Owner HARBIN UNIV OF SCI & TECH
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