Online precise control method for flattening parameters of microscale abrasive particles

A control method and micro-scale technology, applied in the direction of workpiece feed motion control, program control, general control system, etc., can solve the problems of high cost of robot vision system, error of abrasive grain shape characteristic value, and micro abrasive grain image distortion, etc. problems, to avoid the detection and data processing process, to meet the processing quality requirements, and to achieve the effect of flexible adjustment methods

Active Publication Date: 2018-11-16
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The cost of the robot vision system is expensive, and in the process of grinding wheel discharge dressing, in order to prevent damage to the CCD camera caused by chips and electric sparks, protective measures must be taken;
[0005] 2. The detection method has great limitations, and the detection can only be carried out when the grinding wheel is in a static state, and the detection effect is affected by the size of the abrasive grains, so it is difficult to realize real-time monitoring of micro-scale abrasive smoothing parameters;
[0006] 3. The morphology of micro-abrasive grains collected by the CCD camera is a two-dimensional image, and the light transmission of micro-abrasive grains is prone to image distortion. These factors will affect the subsequent data processing, making the extracted abrasive grain morphology features There is a large error in the value
[0008] 1. The focus of the above technology is how to solve the problem of graphitization smoothing efficiency of micro-abrasive cutting edges. Although it involves the online monitoring method of pulse discharge dressing parameters and machine tool motion parameters, the problem of building an online monitoring system has not been solved yet;
[0009] 2. The predicted edge height of the abrasive grains and the effective number of abrasive grains of the grinding wheel can only reflect the state of the edge of the micro-abrasive grains, but cannot accurately monitor the surface characteristics of the smoothing on-line;
[0010] 3. In the smoothing process, only the height of the abrasive grains and the effective number of abrasive grains of the grinding wheel are used as indicators to measure the leveling effect of the micro-abrasive grains, which fails to reflect the application value of its smoothing shape in actual processing, especially for coarse diamond grains. , and it is difficult to meet the leveling time control requirements

Method used

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  • Online precise control method for flattening parameters of microscale abrasive particles
  • Online precise control method for flattening parameters of microscale abrasive particles
  • Online precise control method for flattening parameters of microscale abrasive particles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] In the flattening experiment of micro-abrasive particles, #46 diamond grinding wheel (diameter D=150mm, bronze bond) and iron electrode (45 steel) were fixed on the CNC machine tool (SMART 818), and graphite brushes, Oscilloscope (DS1102E), DC power supply (DCS80), voltage and current sensors (RP1000D and RP1001C) are connected to form a discharge circuit. In order to generate different spark discharges, the open circuit voltage E i =25V, current limit value I i =0.1A, grinding wheel speed N=2400rpm, table feed speed v f =80mm / min, axial feed △z=1mm, cutting depth a p =1 and 5 μm, and the smoothing time of each group was 20 hours.

[0082] Pulse discharge waveform tracking and chips such as microabrasive particle smoothing Figure 5 As shown in (a) and 5(b), according to the constant voltage and constant current conversion principle of the power supply, during the leveling process, the cutting depth a p The increase of the electric spark discharge will gradually co...

Embodiment 2

[0091] Similarly, fix the #46 diamond grinding wheel (diameter D=150mm, bronze bond) and the iron electrode (45 steel) on the CNC machine tool (SMART 818), and connect it with the graphite brush, oscilloscope (DS1102E), DC Power supply (DCS80), voltage and current sensors (RP1000D and RP1001C) are connected to form a discharge circuit, with open circuit voltage E=25V, grinding wheel speed N=2400rpm, cutting depth a p = 1μm (spark discharge), the axial feed Δz = 1mm for experiments. In order to control the discharge current and voltage in the range of 3~6A and 19~23V respectively, adjust the feed speed v of the table during the leveling process f (initial value v f =80mm / min) or current limiting value (initial value I i =0.1A), and the specified number of rotations reaches 1.26×10 6 After the second time, the morphology of the micro-abrasive particles on the grinding wheel section was detected.

[0092] Such as Figure 8 As shown in (a) and 8(b), the cutting edge trimming ...

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Abstract

The invention discloses an online precise control method for flattening parameters of microscale abrasive particles. The method comprises the following steps: (1) clamping an electrode, a diamond grinding wheel and the like to form a discharge circuit, wherein a workstation communicates to a power supply and a numerically-controlled machine tool controller; (2) feedback controlling moving parameters of the machine tool and parameter of the power supply according to impulsive discharge parameters, controlling the discharge current and voltage and calculating the rotating revolutions of the diamond grinding wheel; (3) after determining the maximum flattening area and the maximum effective rotating revolutions of the diamond grinding wheel according to the parameters such as the diamond grinding wheel and impulsive discharge, precisely controlling the flattening area of a abrasive particle cutting edge online by means of the statistic rotating revolutions of the diamond grinding wheel; and (4) when the statistic rotating revolutions of the diamond grinding wheel reach a target value, calculating the flattening area and the edge feeding height of the cutting edge which flattens the abrasive particles, wherein the machine tool stops working. According to the invention, the flattening effect of the microscale abrasive particles can be precisely controlled online by means of the parameters such as the rotating revolutions of the diamond grinding wheel fed back by an in-position flattening system, and flattening areas of different cutting edges can be obtained to meet different processing quality demands.

Description

technical field [0001] The invention relates to the technical field of micro-abrasive smoothing of diamond grinding wheels, in particular to an online precise control method for micro-scale abrasive smoothing parameters. Background technique [0002] The surface quality of the workpiece in precision grinding depends on the shape and distribution of the diamond micro-abrasive grains. At present, the cutting edge morphology of diamond micro-abrasive grains can be controlled by using mechanical grinding, electric spark contact discharge, laser and other dressing technologies, which solves the problem of the cutting edge and equivalence of micro-abrasive grains. However, since the extraction and analysis of the morphology of the micro-scale diamond abrasive grains usually rely on sophisticated detection instruments such as scanning electron microscopes and white light interferometers, in the grinding wheel dressing, the online evaluation of the micro-abrasive grains' edge parame...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24B53/00B24B53/06
CPCB24B53/001B24B53/06B24B49/10B24B53/08G05B19/406G05B19/4163G05B2219/45161G05B2219/49074G05B19/182
Inventor 谢晋何铨鹏杨浩雷嘉铭
Owner SOUTH CHINA UNIV OF TECH
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