An on-line detection method for a numerical control machine tool

Abstract

The application provides an on-line detection method of a numerical control machine tool, which rotates coordinates by using a coordinate rotation instruction of the numerical control machine tool, so that a coordinate axis of the machine tool is parallel or perpendicular to a surface to be detected, then a micrometer is magnetically attracted to the coordinate axis and a workpiece is measured by moving the coordinate, the detection method can measure key dimensions, straightness, flatness, perpendicularity, parallelism and angle error of the workpiece. The method can detect key dimensions and shape and position accuracy of the workpiece on the numerical control machine tool, greatly reduces the detection workload, avoids repeated positioning errors when repairing due to unqualified inspection, and greatly reduces the scrap rate of the workpiece.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of numerical control machine tools, and particularly relates to an online detection method of a numerical control machine tool. BACKGROUND

[0002] With the rapid development of numerical control machine tool manufacturing technology, modern manufacturing industry has also entered an era of rapid development. At the same time, the complexity and precision requirements of mechanical processing parts are also increasing. The precision requirements of mechanical processing parts not only depend on the technical level of the workshop operators and the precision of the numerical control machine tool, but also the precision detection of the parts is also important. At present, the detection of key dimensions of parts mostly needs to be sent to the quality inspection department after processing, which not only is inefficient, but also is difficult to implement for some large and heavy workpieces. And when the precision of the parts does not meet the requirements and needs to be repaired, a series of problems such as repeated positioning error, alignment error, tool setting error and the like will be faced, greatly increasing the difficulty coefficient of part repair, thereby leading to the increase of the scrap rate. Therefore, an online detection method that can be implemented on a machine tool is an urgent problem for processing personnel to solve. SUMMARY

[0003] The present application provides an online detection method of a numerical control machine tool, which is used for online detection of workpiece key dimensions and shape and position accuracy. The method can save detection time and transportation cost, greatly improve the detection efficiency and reduce the scrap rate of part production.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0005] An online detection method of a numerical control machine tool, the method comprising the following steps:

[0006] Rotating the machine tool coordinates by using the coordinate rotation instruction of the numerical control machine tool, so that the first coordinate axis is parallel or perpendicular to the workpiece to be measured;

[0007] Magnetic absorption of the micrometer on the first coordinate axis;

[0008] Moving the machine tool along the second coordinate axis and / or the third coordinate axis, so that the micrometer contacts the first measurement point of the workpiece. At this time, the needle indication of the micrometer is recorded as the first value, and the first indication of the movement of the machine tool along the second coordinate axis and / or the third coordinate axis is recorded;

[0009] Moving the machine tool again along the second coordinate axis and / or the third coordinate axis, so that the micrometer contacts the second measurement point of the workpiece. At this time, the needle indication of the micrometer is also displayed as the first value, and the second indication of the movement of the machine tool along the second coordinate axis and / or the third coordinate axis is recorded;

[0010] The difference between the first and second readings is calculated to obtain the measured size between the first and second measuring points.

[0011] Further, the first axis, the second axis and the third axis are respectively the x-axis, the y-axis and the z-axis of a Cartesian coordinate system.

[0012] Further, the dial gauge is moved along the surface to be measured by the motion of the numerical control machine tool to measure the parallelism or straightness of the surface to be measured.

[0013] Further, the coordinate rotation command of the numerical control machine tool is used to rotate the machine tool coordinate axis parallel or perpendicular to the surface to be measured to measure the angle value or parallelism error between two surfaces.

[0014] Further, the dial gauge is brought into contact with the first surface, and the coordinate axis is moved to make the dial gauge contact the second surface parallel to the first surface, and the movement reading of the machine tool is recorded in the case that the readings of the dial gauge are equal at the two times of contact, to measure the distance between the first surface and the second surface.

[0015] According to the above technical solution, compared with the prior art, the method can detect the key size and the straightness, angle, flatness, parallelism and perpendicularity of a workpiece on line. In the present application, the key size and the straightness, angle, flatness, parallelism and perpendicularity of the workpiece can be detected on the machine tool, the repeated clamping error of the workpiece caused by unqualified size is avoided, the workload of detection is reduced, and the scrap rate of the workpiece is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 An example of a workpiece to be detected. DETAILED DESCRIPTION

[0017] The following will take the attached Figure 1 The specific implementation of detecting the key size and behavior accuracy of the workpiece by using the numerical control machine tool will be described below with the example of a domestic workpiece. In the present example, the key size, angle, straightness, flatness and parallelism of the workpiece are included.

[0018] The workpiece includes a first surface 1, a second surface 2 and a third surface 22. The first surface 1 is a detection reference surface, the included angle between the second surface 2 and the first surface 1 is 60°, and the third surface 22 is parallel to the second surface 2. The method includes the following steps:

[0019] S1. Adjust the workpiece so that the first surface 1 of the workpiece is parallel to the X-axis of the machine tool. At this time, move the Y-axis and the Z-axis to make the dial gauge contact the workpiece. Record the dial gauge reading at this time as zero. Move the X-axis to make the dial gauge probe move on the first surface 1. Record the reading of the dial gauge during the movement. The maximum reading is the straightness and flatness of the first surface 1.

[0020] S2. Input instruction to rotate the machine coordinate 60°, at this time the X axis will be parallel to the second surface 2, move the Y axis and Z axis to make the dial gauge contact the workpiece, record the dial gauge reading at this time as zero, move the X axis to make the dial gauge probe move on the second surface 2, record the dial gauge reading during the movement, the difference between the front end reading and the rear end reading is the angular error of the second surface 2 and the first surface 1, the maximum reading of the dial gauge during the movement is the straightness and flatness of the second surface 2.

[0021] S3. Keep the X axis parallel to the second surface 2, move the Y axis and Z axis to make the dial gauge contact the third surface 22, and make the dial gauge reading reach the zero reading in S2, record the Y axis reading, which is the distance from the second surface 2 to the third surface 22.

[0022] S4. Keep the X axis parallel to the second surface 2, move the X axis to make the dial gauge probe move on the third surface 22, record the dial gauge reading during the movement, the difference between the front end reading and the rear end reading is the parallelism error of the third surface 22 and the second surface 2, the maximum reading of the dial gauge during the movement is the straightness and flatness of the third surface 22.

Claims

1. An online inspection method for CNC machine tools, characterized in that, The method includes the following steps: Using the coordinate rotation commands of the CNC machine tool, the machine tool coordinates are rotated so that the first coordinate axis is parallel or perpendicular to the dimension of the workpiece to be measured; Attach the dial indicator to the first coordinate axis; Move the machine tool along the second and / or third coordinate axes until the dial indicator contacts the first measuring point of the workpiece. Record the reading of the dial indicator needle as the first value and record the first reading of the machine tool as it moves along the second and / or third coordinate axes. Move the machine tool again along the second and / or third coordinate axes so that the dial indicator contacts the second measuring point of the workpiece, so that the dial indicator needle reading is also the first value, and record the second reading of the machine tool as it moves along the second and / or third coordinate axes; Calculate the difference between the first reading and the second reading to obtain the measurement dimension between the first measurement point and the second measurement point; The coordinate rotation command of the CNC machine tool is used to rotate the machine tool coordinate axis to be parallel or perpendicular to the surface to be measured, so as to measure the angle value or parallelism error between the two surfaces. Make the dial indicator contact the first surface, and move the coordinate axis to make the dial indicator contact the second surface parallel to the first surface. Record the machine tool movement reading when the dial indicator readings are equal during the two contacts, so as to measure the distance between the first surface and the second surface. The first, second, and third coordinate axes are the x-axis, y-axis, and z-axis of the Cartesian coordinate system, respectively. The movement of a CNC machine tool is used to move a dial indicator along the surface to be measured, in order to measure the parallelism or straightness of the surface.

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