Five-axis linkage machining center, also called five-axis machining center, is a high-tech, high-precision machining center specially used for processing complex curved surfaces. This machining center system plays an important role in a country’s aviation and aerospace industry. , military, scientific research, precision industries such as medical devices and high-precision medical equipment have a decisive influence.
Do you know what tool setting methods are available for five-axis machining centers? Let’s take a look below!
1. Analysis of the relationship between machine tool and workpiece coordinate system
The machine tool coordinate system, also called mechanical coordinate system, is set by the machine tool manufacturer to determine the position of the workpiece, tool, etc. in the machine tool. After starting, the machine tool usually automatically finds the origin of the machine tool coordinate system through zero return and reference point return operations, which is the reference system for all other coordinate systems. contact details.
How to realize the transformation between the workpiece coordinate system and the machine tool coordinate system is very important to the operator. Through the discussion of tool setting methods for CNC milling machines and machining centers, the coordinates of each base point in the workpiece coordinate system are converted to the machine tool coordinate system and the relationship between the two coordinate systems is established. In CNC milling machines or machining centers, six different zero points of the workpiece are usually stored; When setting the tool, the tool setting value can be entered in any predefined coordinate system. During processing, the tool setting value can be called up by entering the corresponding coordinate. system. The offset value stored in the register.
2. Knife adjustment method
Since the machining center involves three coordinate axes: X, Y and Z, the X, Y and Z axes must be calibrated separately during the tool setting process (note that the three coordinate axes are not in no order when adjusting the tool). The trial cutting method is a tool setting method often used in practice.
3. Unilateral knife adjustment method
The part coordinate system is constructed in the middle of the blank. Suppose the size of the blank is 100X80X20 and all surfaces of the blank have been processed. The selected tool size is φ20 since the tool projection is a circle. tool setting, the circle of φ20 is used as the tool. The following steps need to be completed for tool adjustment with Y axis: First, install the workpiece on the workbench through the clamping device. When tightening, all four sides of the workpiece must leave space for tool adjustment. The second is to rotate the tool at a certain speed, move the workbench manually or by crank, so that the tool is close to the left side of the blank, move the spindle to give the tool a suitable depth in the Z direction, and determine the tool by observing the iron filings or listening to the cutting sound. Let it contact the left side of the blank, enter the G54-G59 coordinate system interface through the OFSSET button on the control panel, taking the G54 coordinate. system as an example. Position the cursor on the corresponding X, enter -(100/2+20/2)=-60, then click Measure. At this point, the X value calibration is complete. If the tool is close to the right side of the blank, the value to enter at this time is +60. Similarly, adjustment of the tool in the Y-axis direction can be achieved by controlling the tool to contact the front or rear of the blank.
3. Tool adjustment on Z axis
The tool rotates and the worktable and spindle are controlled to move quickly. Once the tool moves to a position near the top surface of the workpiece at a certain safe distance, the travel speed is reduced to bring the bottom surface into contact with the tool. the upper surface of the part. At this time, call the coordinate system and position the cursor. Enter 0 in Z and click the corresponding softkey under Measurement to perform tool calibration on the Z axis.
In this tool setting method, when adjusting the X axis and Y axis, the tool should only contact one side of the blank. However, the blank and tool dimensions must be known when setting the tool. therefore it is suitable for setting tools on ordinary blanks.
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