Machine tool on-line measuring device

Abstract

The invention provides a machine tool on-line measuring device. The machine tool on-line measuring device comprises a measuring sensor, a measuring head positioning clamp, a moving device, a data collecting, processing and displaying system and a measuring head calibrating device. The moving device clamps the measuring head positioning clamp, and the measuring head positioning clamp clamps the measuring sensor. And the data acquisition, processing and display system is connected with the measurement sensor. The measuring sensors such as the grating measuring head or the inductance measuring head have high measuring precision, the measuring head positioning clamp has the functions of fixing the measuring head and assisting in measuring, metering calibration is carried out according to the requirement of a measuring tool, and the positioning clamp is simple in structure, good in stability and high in measuring precision. The measuring head moving device selects a standard six-axis mechanical arm to move, rotate, swing and the like which are similar to those of an operator, can simulate human measurement actions after carrying a measuring head, and is matched with a combined positioning clamp to meet various measurement scenes, the measurement positioning clamp has a measurement range adjusting function, and the measurement accuracy is improved. And accurate measurement of sizes in different ranges can be satisfied.

Description

Technical Field

[0001] The invention belongs to the field of mechanical processing measurement, and in particular relates to an online measuring device for a machine tool. Background Art

[0002] Before machining, the operator needs to perform tool setting operations on the parts to be machined to determine the relative coordinates of the parts to be machined. Traditional tool setting methods include trial cutting and feeler gauge and block gauge setting. Although the above tool setting methods are fast, the trial cutting method is not suitable for fine machining. The tool setting accuracy of feeler gauge and block gauge setting is largely related to experience, and requires a high level of proficiency of workers. There will be certain deviations between different operators.

[0003] During the machining process, the tool will gradually wear out during use. After a certain degree of wear on the tool, the cutting force will increase, the cutting temperature will rise, and then the workpiece size error will increase and the surface quality will decrease. At the same time, the initial wear of the tool will cause the tool compensation data deviation to lead to the increase of size error and other problems. Therefore, online monitoring of tool wear is very necessary. Traditional monitoring methods include observation method, measurement method, etc. The above methods are often lagging and cannot achieve online measurement.

[0004] During the machining process, in order to verify the accuracy of the machining process, the operator is often required to perform periodic measurements. Due to factors such as lathe accuracy, material properties, and tool wear, the amount of cutting each time and the actual machining amount are often different. Therefore, periodic measurements are very necessary. Traditional measurement methods use conventional measuring tools such as vernier calipers and micrometers to measure the workpiece. Before finishing, if there is a deviation in the measurement results, the final size will deviate from the design requirements. Summary of the invention

[0005] The object of the present invention is to provide an online measuring device for machine tools, which can realize tool setting detection, tool wear detection and online position and size measurement through the combination configuration of different pairs of fixtures without relying on the accuracy of the machine tool and the manipulator.

[0006] An online measuring device for machine tools comprises a measuring sensor, a probe positioning fixture, a moving device, a data acquisition processing and display system and a probe calibration device; the moving device clamps the probe positioning fixture, the probe positioning fixture clamps the measuring sensor; the data acquisition processing and display system is connected to the measuring sensor.

[0007] Furthermore, the measuring sensor is a grating probe or an inductive probe, and the measuring accuracy is above 2 μm.

[0008] Furthermore, the mobile device is a six-degree-of-freedom manipulator with a locking function.

[0009] Furthermore, the probe positioning fixture includes a tool setting detection fixture, a tool wear detection fixture and a dimension measurement fixture. The probe positioning fixture has the functions of fixing the probe and auxiliary measurement. The manufacturing accuracy of the fixture parts is above 0.005mm.

[0010] Furthermore, the probe positioning fixture can be adjusted to multiple positions through linkage slide blocks and positioning pins on both sides, thereby realizing the function of measuring different size ranges with the same fixture.

[0011] Furthermore, the probe calibration device includes a calibration device and a standard ring gauge.

[0012] The beneficial effects of the present invention are as follows: the measuring sensors such as the grating probe or inductive probe of the present invention have high measuring accuracy, the probe positioning fixture has the functions of fixing the probe and assisting measurement, the manufacturing accuracy of the fixture parts reaches above 0.005mm, and the metrological calibration is performed according to the measuring tool requirements, the positioning fixture has a simple structure and good stability, the probe moving device uses a standard six-axis manipulator that can perform movements similar to those of an operator, such as movement, rotation, and swinging, and can simulate human measuring movements after carrying the probe, and can meet a variety of measurement scenarios with the combined positioning fixture, the measuring positioning fixture has a measuring range adjustment function, and can meet the accurate measurement of sizes in different ranges, and each positioning fixture and probe is equipped with a calibration device, which is convenient for calibration operations before measurement, thereby further improving the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the tool setting and tool online wear detection mechanism of the present invention;

[0014] Figure 2 It is a schematic diagram of the online dimension measurement mechanism of the present invention;

[0015] FIG3( a ) is a workpiece measurement diagram A of the present invention;

[0016] FIG3( b ) is a workpiece measurement diagram B of the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings.

[0018] like Figure 1As shown, the tool setting and tool wear detection mechanism includes a measuring sensor 1, a probe positioning fixture 2, a moving device (six-degree-of-freedom manipulator) 3, a data acquisition, processing and display system 4, and a probe calibration device 5, wherein the measuring sensor 1 is the main measuring element, and the probe positioning fixture 2 is clamped by the moving device (six-degree-of-freedom manipulator) 3, and the positioning fixture 2 clamps the measuring sensor 1, so as to ensure that the measuring sensor 1 can be moved to the specified position of the machine tool, so that the probe contacts the workpiece, and the probe is pressed in 1 to 2 mm, and the position is locked and kept stationary, and the measurement value of the measuring sensor 1 is recorded, and then the machine tool tool movement is controlled by the machine tool wire control handle, and the machine tool coordinate value and the probe measurement value are read when the tool moves to just contact the probe positioning fixture, and the probe calibration device 5 is used to calibrate the combined size of the probe and the probe positioning fixture, and the relative position of the tool and the workpiece can be obtained by calculation, thereby realizing the tool setting function.

[0019] like Figure 1 As shown, before processing, the probe positioning fixture 2 is clamped by the moving device (six-degree-of-freedom manipulator) 3, and the probe positioning fixture 2 clamps the measuring sensor 1 to ensure that the measuring sensor 1 can be moved to the machine tool chuck position or platform position, so that the probe contacts the chuck or platform, and the probe is pressed in 1 to 2 mm. After locking the position, keep it still, and control the machine tool tool to move to just contact the probe positioning fixture through the machine tool wire control handle to read the machine tool coordinate value and the probe measurement value. After processing for a period of time, control the machine tool tool to move to the initial coordinate position through the machine tool wire control handle again, read the probe measurement value, and compare the difference between the two measurements to obtain the tool wear amount, and then perform tool compensation or replace the tool in time.

[0020] like Figure 1 As shown, the probe positioning fixture 2 is clamped by the moving device (six-degree-of-freedom manipulator) 3, and the positioning fixture clamps the measuring sensor 1, ensuring that the measuring sensor can be moved to the specified position of the machine tool, so that the probe contacts the workpiece, and the probe is pressed in 1 to 2 mm. After locking the position, it remains stationary, and then the machine tool chuck is controlled to rotate by the machine tool wire control handle, and the displayed value of the grating probe is read, so that the runout, roundness and other form and position tolerances of the processed workpiece can be accurately measured, and the alignment operation before processing can also be performed, with intuitive display, high resolution, and convenience.

[0021] like Figure 2As shown, the dimension online measurement mechanism mainly includes a plurality of measuring sensors 1 such as grating probes or inductive probes, an online measuring positioning fixture 6 for the probes, a moving device (six-degree-of-freedom manipulator) 3, a calibration ring gauge 8, a data processing and display system 4, and a linkage adjustment slider 7. Among them, the measuring sensors such as grating probes or inductive probes are the main measuring elements, and the online measuring positioning fixture 6 is clamped by the moving device (six-degree-of-freedom manipulator) 3. The online measuring positioning fixture 6 clamps a plurality of measuring sensors 1 such as grating probes or inductive probes according to the measurement needs, and carries the grating probe to the position to be measured, so that after the probe contacts the workpiece, the moving device swings left and right at different angles and positions to measure the workpiece, and the data processing and display system 4 automatically calculates the measurement data of a plurality of measuring sensors such as grating probes or inductive probes and displays the measurement values, so as to realize the online measurement function. Before the measurement, the online measurement mechanism is used to measure and calibrate the standard ring gauge of similar specifications to ensure the accuracy of the measurement system.

[0022] Among them, the moving device (six-degree-of-freedom manipulator) 3 and the probe positioning fixture 2 are fixed by hard connection, and have good stability to each other. The moving device (six-degree-of-freedom manipulator) 3 has a locking function and good rigidity to avoid the problem of mutual movement. The moving route and moving position can be planned, and a variety of measurement actions can be realized, simulating various human actions, adapting to a variety of measurement scenarios, and having high measurement efficiency and stability.

[0023] The probe positioning fixture 2 includes a tool setting detection fixture, a tool wear detection fixture and a dimension measurement fixture. The probe positioning fixture has the functions of fixing the probe and auxiliary measurement. The manufacturing accuracy of the fixture parts is above 0.005mm, and it is calibrated according to the measuring tool requirements to meet the requirements of tool setting and measurement. At the same time, the fixture is required to have a certain rigidity and stability to avoid deformation and wear during long-term use to ensure online measurement accuracy.

[0024] The dimension measuring fixture in the probe positioning fixture 2 has a measuring range adjustment function, and multiple gear adjustments are achieved through the linkage sliders and positioning pins on both sides, thereby realizing the measurement capability of different size ranges with the same fixture, making the online measurement function highly versatile.

[0025] The probe calibration device comprises a calibration device 5 and a standard ring gauge 8. The calibration device 5 has high precision and certain versatility, so that the measuring device can be conveniently and quickly calibrated and tested before each measurement, further ensuring the measurement accuracy.

[0026] The measuring sensor 1 is a grating probe or an inductive probe, and the measuring accuracy is above 2 μm, which ensures that the measuring accuracy meets the current detection requirements in the field of mechanical processing.

[0027] The present invention uses a mobile device (six-degree-of-freedom manipulator) 3 and a probe positioning fixture to clamp a grating probe or an inductive probe and other measuring sensors to perform tool alignment detection, tool wear detection, part alignment, and runout inspection. By combining the use of multiple probe positioning fixtures, online measurement of the inner diameter, outer diameter and axial size of the part can be achieved.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A machine tool online measuring device, characterized in that: The invention comprises a measuring sensor (1), a probe positioning fixture (2), a moving device (3), a data acquisition, processing and display system (4) and a probe calibration device; the moving device (3) clamps the probe positioning fixture (2), and the probe positioning fixture (2) clamps the measuring sensor (1); and the data acquisition, processing and display system (4) is connected to the measuring sensor (1).

2. The machine tool online measuring device according to claim 1, characterized in that: The measuring sensor (1) is a grating probe or an inductive probe, and the measuring accuracy is above 2 μm.

3. The machine tool online measuring device according to claim 1, characterized in that: The moving device (3) is a six-degree-of-freedom manipulator, and the six-degree-of-freedom manipulator has a locking function.

4. The machine tool online measuring device according to claim 1, characterized in that: The probe positioning fixture (2) comprises a tool setting detection fixture, a tool wear detection fixture and a dimension measurement fixture. The probe positioning fixture has the functions of fixing the probe and assisting measurement. The manufacturing accuracy of the fixture parts is above 0.005 mm.

5. The machine tool online measuring device according to claim 4, characterized in that: The probe positioning fixture (2) can adjust multiple gears through linkage slide blocks and positioning pins on both sides, thereby realizing the function of measuring different size ranges with the same fixture.

6. The machine tool online measuring device according to claim 1, characterized in that: The probe calibration device comprises a calibration device (5) and a standard ring gauge (8).

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