A Tool Retracting Method Applicable to Five-Axis CNC Machine Tool

Abstract

The invention discloses a tool retracting method applicable to a five-axis numerical control machine tool, and relates to the technical field of numerical control machine tools. A tool retraction method applicable to five-axis CNC machine tools, including step 1: when the machine tool is running normally, the axis position coordinates of the machine tools are stored in a designated PLC variable block in real time, and the variable block is set to be saved after power-off; steps Two: After the machine tool is powered off and restarted, in the PLC program, first check whether the tool axis position coordinates are consistent with the reference point axis position coordinates. If they are not consistent, transfer the data in the variable block that stores the position to the system variables in the system, and then transfer the data with The position data system variables are imported into the cyclic operation program in advance; Step 3: The tool is retracted along the normal direction by running the cyclic operation program. The invention can safely and quickly withdraw the tool along the normal direction in the mode of selecting the incremental encoder of the A / C (B / C) axis, so as to avoid damage to the tool or the workpiece.

Description

technical field [0001] The invention relates to the technical field of numerical control machine tools, in particular to a tool retracting method applicable to five-axis numerical control machine tools. Background technique [0002] In the five-axis CNC machine tool, when selecting the measurement system for the A / C (B / C) rotary axis, you can choose either an incremental encoder or an absolute encoder; the incremental encoder is cheap, but every The axis coordinates will be lost after the power failure of the machine tool, and need to return to zero when restarting; the price of absolute encoder is relatively high, and the axis coordinates will not be lost after power failure and restart, and there is no need to return to zero. In the normal working condition of the machine tool, these two encoders can meet the use requirements, but if the machine tool is suddenly powered off when the A / C (B / C) axis deflection angle is used to process holes on inclined or curved surfaces, th...

AI Technical Summary

Problems solved by technology

In the normal working condition of the machine tool, these two encoders can meet the use requirements, but if the machine tool is suddenly powered off when the A / C (B / C) axis deflection angle is used to process holes on inclined or curved surfaces, the tool will stuck in the hole

After the machine tool is powered on again, it is necessary to return the machine tool to a safe position along the normal direction of the tool. At this time, if the A / C (B / C) rotary axis is selected as an absolute encoder, you can directly set the A / C (B / C) B / C) axis coordinates are transformed into the five-axis coordinate system through the TRAORI coordinate system, and the machine tool is directly withdrawn along the normal direction of the tool; if the A / C (B / C) rotation axis is selected as an incremental encoder, because the machine tool cannot Back to zero, the A / C (B / C) axis coordinate value is also unknown, and cannot be transformed into a five-axis coordinate system through TRAORI, that is, the tool cannot be retracted in the normal direction

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