Method for centering B-axis rotation center and cutting edge arc center

Abstract

The invention discloses a method for centering a B-axis rotation center and a cutting edge arc center, which is used for tool side-arranged clamping.The method comprises the following steps of rough tool setting, specially carrying out online tool setting through a CCD camera for preliminary centering; and fine tool setting, specially cutting a complete structural unit on the surface of a workpiece through a tool swing machining method, thereby obtaining a two-dimensional profile curve of the structural unit, and calculating a B-axis rotation center according to the two-dimensional profile curve; and moving a tool according to the calculated B-axis rotation center, if the X and Z position deviations after movement are within the acceptable range, completing fine tool setting, and otherwise, repeating the fine tool setting process until the X and Z position deviations of the B-axis rotation center and the cutting edge arc center are within the acceptable range. According to the method, online tool setting is conducted first by the CCD camera for preliminary centering, then trial cutting tool setting is conducted for fine tool setting, tool setting in a tool side-arranged clamping mode can be achieved, and in the fine tool setting process, errors can be quantized through calculation, and adjustment is repeatedly conducted to achieve the expected precision.

Description

technical field [0001] The invention relates to the technical field of ultra-precision machining, in particular to a centering method for a B-axis turning center and a blade arc center. Background technique [0002] At present, the methods for centering the tool tip and the rotation center of the B-axis worktable include CCD camera online tool setting and trial cutting method. Among them, the CCD camera online tool setting is to place the arc diamond tool in the field of view of the CCD camera, rotate the B axis to make the tool in three different positions, and move the tool so that the same point in these three positions coincides with the center of the CCD field of view. The three-point method automatically calculates the center of rotation of the B-axis, and the radius of the tool arc is known, so that the position of the tool is adjusted so that the center of the arc of the blade coincides with the center of rotation of the B-axis; The B-axis swings and moves along the...

AI Technical Summary

Problems solved by technology

Specifically, the CCD online tool setting is affected by the angle deviation of the CCD camera, the magnification of the lens and the sharpness of the focus. There are certain errors in the calculation of the B-axis rotation center accuracy, and the tool swing processing method for microspherical lens processing requires When the tool is clamped on the side, it is more difficult to accurately focus on the frontmost point of the blade with CCD observation after the tool is clamped on the side, resulting in greater errors

[0004] The Chinese patent with the application publication number CN 106001641 A discloses a tool setting device and a tool setting method based on a laser-based virtual trial cutting method for CNC lathes. After the workpiece coordinate system is established with the reference tool, the adjustable laser device and The projection board confirms the diameter and length of the virtual workpiece, and uses the virtual workpiece as the "cutting" object for "trial cutting" tool setting. The tool setting process of this program is similar to the actual trial cutting method, but it is far away from the real workpiece and will not happen. In the event of an accident, there is no need to measure after each turning tool turns the workpiece like the real trial cutting method, but directly input the coordinate value of the virtual workpiece after the turning tool is aligned with the reference point, which greatly reduces the tool setting. The tedious workload in the process, however, this solution is limited to moving the turning tool to a known position, and cannot align the turning tool with the center of rotation where it is located

[0005] The Chinese patent application publication number CN 111975021 A discloses a method for aligning an ultra-precision turning tool center with a B-axis turning center. The ultra-precision turning device used includes an X-axis motion guide rail, a Z-axis motion guide rail, a spindle, and a rotating platform. , considering that the center of rotation of the rotating platform is completely aligned with the center of the tool, a virtual axis is introduced, that is, it is not necessary to completely align the center of rotation of the rotating platform with the center of the tool, only the positional relationship between the two needs to be obtained, and the X-axis motion guide rail Compensate with the movement of the Z-axis motion guide rail to achieve complete alignment. This solution no longer pursues the alignment of the tool center and the B-axis rotation center forcibly, but uses a trial cutting method to measure the relative position relationship, and through a series of mathematical calculations The device can achieve the target function well even in the case of misalignment, that is to say, the solution only determines the relative position through trial cutting when it is first used, and does not carry out actual alignment

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