A kind of measuring and grinding method of grinding machine tool

Abstract

The invention discloses a measurement and grinding method of a grinding machine tool. The measurement and grinding method of the grinding machine tool is characterized in that a point contact type synchronous on-line measurement mode is adopted, the axial size physical quantity in the grinding process of a workpiece is measured in real time on line, and the change condition of the measured size is directly tracked in real time; by arranging a PLC electric control system, a machine tool operation panel, a measurement instrument controller and a torque giving panel of the machine tool input control signals to the PLC electric control system, and the PLC processes the input signals and then outputs a control signal to a machine tool indication panel, a grinding self-adaption controller and a rapid retreating mechanism; and three machining stages of rough grinding, fine grinding and buffing are adopted for grinding in the grinding process of the machine tool.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a measuring and grinding processing method of a grinding machine tool, especially a special machine tool for grinding hard alloy products. Background technique [0002] At present, manual tool grinders occupy a relatively dominant position in our country. This is suitable for the current domestic market demand and actual affordability of our country. For example, the MQ6025A universal tool grinder is manually operated. Based on the consideration of cost saving, the numerical control transformation of ordinary grinding machines has also become the first choice for enterprises to carry out technology upgrades and equipment transformation. trend, and many companies have made some progress in this regard. General CNC lathes or CNC milling machines use open-loop, semi-closed-loop or closed-loop feedback systems. The principle is to feed back the displacement of the actu...

AI Technical Summary

Problems solved by technology

[0003] 1. The neglect and wrong judgment of the blunt edge of the grinding wheel by the CNC grinding machine lead to incomplete grinding of the workpiece

[0004] In the design and development of CNC grinding machines, even if micron-level high-precision grating measuring rulers are introduced as position loop feedback, satisfactory results cannot be obtained

Because although the position feedback is adopted and the displacement is interpolated, the position of the grinding machine table is more accurate, but during the grinding process, the blunt wear of the grinding wheel front is different, so that the remaining grinding allowance of each part of the workpiece is also different, and In the "zero feed" state, when the grinding wheel rotates more or less for grinding, the grinding quality of the workpiece is also different.

[0005] Therefore, in practice, the position feedback mechanism used by many CNC grinding machines measures the remaining displacement of the worktable, and sends a displacement feed signal through the servo system to make the worktable run to the target position and stop the displacement feed. The sharp bluntness of the grinding wheel directly leads to the failure of the workpiece to be machined in place. At this time, the CNC system judges that the workbench has reached the target position and judges that the workpiece has been ground and processed in place, resulting in unqualified grinding of the workpiece.

[0006] 2. The "constant displacement forced feed" method of the CNC grinding machine causes serious deformation of the transmission chain of the machine tool

This detection method is based on the separation of processing and detection. Product detection cannot be carried out during processing, and product processing cannot be carried out during detection, resulting in low production efficiency. The clamp positioning datum is constantly changing, resulting in an artificial increase in the machining error of the workpiece, which affects product quality

Most of the measurement schemes currently used on grinding machines are not ideal. Some methods such as simulation calculations are used to estimate the loss of the grinding wheel during the grinding process, and then included in the grinding machine data system. This design is based on the wear of the grinding wheel according to certain rules. As above, there are many influencing factors in the actual grinding process, so it cannot reflect the real grinding situation well, so the practical application of the scheme is not ideal

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