Trapezoidal external thread turning instant cutting force model building and experimental testing method

A technology of instantaneous cutting force and construction method, applied in special data processing applications, instruments, electrical digital data processing, etc.

Inactive Publication Date: 2016-07-20
HARBIN UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing theoretical research on cutting force mainly focuses on the influence of cutting force on vibration, but there are few studies on the mechanism of vibration on cutting force.
At the same time, the measurement of cutting force in the existing thread turning process mainly adopts the online measurement of cutting force by placing the dynamometer on the end of the tool. This method ignores the influence of the introduction of the dynamometer on the inherent characteristics of the system during the test process and the test The influence of the position on the test results makes the detected data deviate from the real data. At the same time, this method can only obtain the total excitation of the part to be tested, but it cannot distinguish the various property excitations of the system from it.

Method used

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  • Trapezoidal external thread turning instant cutting force model building and experimental testing method
  • Trapezoidal external thread turning instant cutting force model building and experimental testing method
  • Trapezoidal external thread turning instant cutting force model building and experimental testing method

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Experimental program
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Effect test

specific Embodiment approach 1

[0087] Specific implementation mode 1: a method for building an instantaneous cutting force model for turning trapezoidal external threads, the specific steps are:

[0088] Step 1: Analyze the turning process of large-pitch thread, and establish the mathematical model of the actual cutting motion trajectory of the tool tip under the action of vibration; according to the turning large-pitch thread tool-worker contact relationship, establish the instantaneous cutting attitude model of the left and right blades of the tool under the action of vibration; The influence mechanism of vibration on the cutting motion trajectory of the tool tip and the angle of the left and right blades of the tool, establish the parameter model of the instantaneous cutting layer of the left and right blades of the tool under the action of vibration, and finally establish the instantaneous cutting of the left and right blades of the large pitch trapezoidal external thread tool Force model; through the de...

specific Embodiment approach 2

[0124] Specific embodiment two: an experimental test method for turning trapezoidal external thread with large pitch by utilizing the instantaneous cutting force model for turning trapezoidal external thread in specific embodiment 1. The specific steps are:

[0125] Step 1: Turning large-pitch trapezoidal external thread Experimental method 1: First, design a bar with a diameter of 148 mm and a length of 130 mm, and then use tool 1 to keep the radial depth of cut of the tool at 4 mm on a CA6140 lathe at a speed of 25 rpm , the axial single machining allowance is 0.25mm, and the left and right cutting edges of the tool are used to cut along one side of the axial direction;

[0126] Alternatively, experimental method 2 for turning large-pitch trapezoidal external threads: first design and process a right-handed trapezoidal external thread specimen with a diameter of 148mm, a total length of 230mm, a thread length of 190mm, and a pitch of 16mm, and then use tool 2 on a CA6140 lath...

Embodiment 1

[0140] Implementation Example 1: Tool Nose Cutting Motion Trajectory under Vibration

[0141] During the actual machining process, the tool tip will be affected by vibration, which will cause displacement increments, thereby changing the actual cutting motion trajectory of the tool tip. Now describe the actual cutting trajectory of the tool tip relative to the workpiece when the workpiece rotates once under the action of vibration. The specific results are as follows: Figure 16 shown.

[0142] Set point a as the theoretical tool tip position, a′ as the tool tip position under the action of vibration, x t (t), x t (t), x t (t) are the offsets of the tool tip in the three directions of x, y, and z under the action of vibration, that is, the vibration displacement, and the vibration displacement is a vector unit. The actual cutting motion trajectory equation of the tool tip under the action of vibration is shown in formula (1).

[0143] ...

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Abstract

The invention relates to a cutting force model building and experimental testing method, in particular to a trapezoidal external thread turning instant cutting force model building and experimental testing method.The problem that according to an existing instant main cutting force study method, the influence mechanism of tool nose cutting motion track changes and tool cutting edge inclination changes on instant cutting force in the coarse-pitch thread turning process cannot be revealed is solved.The trapezoidal external thread turning instant cutting force model building and experimental testing method specifically comprises a tool nose cutting motion track under the vibration action, the instant cutting postures of a left cutting edge and a right cutting edge of a tool under the vibration action, instant cutting layer parameters of the left cutting edge and the right cutting edge of the tool, the instant cutting force of the left cutting edge and the right cutting edge of the tool, a coarse-pitch trapezoidal external thread turning experimental method and the instant cutting force of the left cutting edge and the right cutting edge of the tool during turning of a trapezoidal external thread with the thread pitch of 16 mm.The influence mechanism of the tool nose cutting motion track changes and the tool cutting edge inclination changes on instant cutting force in the coarse-pitch thread turning process is revealed.

Description

technical field [0001] The invention relates to a cutting force model building and experimental testing method for turning trapezoidal external thread, in particular to a model building and experimental testing method for left and right instantaneous cutting force of a large-pitch trapezoidal external thread tool. Background technique [0002] The mechanical press is suitable for various cold stamping processes such as deep drawing, forming, bending, correction, and punching of thin plate parts. It is the main working machine for large stamping parts such as automobile panels, and the large-pitch screw is used as an important adjustment component of the press. , has an important impact on the static and dynamic accuracy of the press machine, so the processing accuracy and surface quality of the large-pitch screw have high processing requirements. [0003] Since the large-pitch thread is a non-standard part, its pitch is large, the tooth groove is wide and deep, and the axial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/367G06F2119/18
Inventor 姜彬孙彬李哲赵娇
Owner HARBIN UNIV OF SCI & TECH
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