Cnc Machining Center Operation Rules

1: Preparation for start-up
The CNC machining center machine tool first returns to the reference zero position of the machine tool (ie, zero return) every time it is turned on or the machine tool is reset by emergency stop, so that the machine tool has a reference position for its subsequent operations.

2: workpiece clamping
Before the workpiece is clamped, all surfaces should be cleaned, and there should be no oil stains, iron filings and dust, and the burrs on the surface of the workpiece should be removed with a file (or oil stone). The high-speed rail used for clamping must be ground by a grinder to make it smooth and flat. The code iron and nut must be strong and can reliably clamp the workpiece. For some small workpieces that are difficult to clamp, they can be directly clamped on the tiger; the machine tool table should be clean and free of iron filings, dust and oil; At the four corners of the workpiece, it is necessary to add equal-height horns in the middle for workpieces with large spans. According to the size of the drawing, use a drawing ruler to check whether the length, width and height of the workpiece are qualified. When clamping the workpiece, according to the clamping and placement method of the programming work instruction, it is necessary to consider avoiding the processing part and the situation that the cutter head may hit the fixture during processing. After the workpiece is placed on the bolster, the reference surface of the workpiece should be pulled according to the requirements of the drawing, and the verticality of the workpiece that has been ground on all six sides should be checked. After the workpiece is pulled, the nut must be tightened to prevent the workpiece from shifting during processing due to weak clamping; pull the watch again to make sure that the error is within tolerance after clamping.

3: The number of workpiece touches
For the clamped workpiece, the touch head can be used to determine the reference zero position for processing, and the touch head can be of photoelectric type and mechanical type. There are two kinds of methods: middle touch number and unilateral touch number. The steps of middle touch number are as follows: photoelectric static, mechanical speed 450~600rpm. Manually move the X-axis of the worktable in the middle of the touch, so that the touch head touches one side of the workpiece. When the touch head just touches the workpiece and the red light is on, set the relative coordinate value of this point to zero; then move the work manually. The X-axis of the table makes the colliding head touch the other side of the workpiece. When the colliding head just touches the workpiece, record the relative coordinates at this time. According to its relative value minus the diameter of the collision head (that is, the length of the workpiece), check whether the length of the workpiece meets the requirements of the drawing. Divide this relative coordinate number by 2, and the obtained value is the middle value of the workpiece X axis, and then move the worktable to the middle value on the X axis, and set the relative coordinate value of the X axis at this point to zero, this point is the workpiece The zero position on the X axis. Carefully record the mechanical coordinate value of the zero position on the X axis of the workpiece in one of G54~G59, and let the machine tool determine the zero position on the X axis of the workpiece. Double check the correctness of the data again. The steps of workpiece Y-axis zero setting are the same as the X-axis operations.

4: prepare the tool
According to the tool data in the programming work instruction, replace the tool to be processed, let the tool touch the height measuring device placed on the reference plane, and set the relative coordinate value of this point to zero when the red light of the measuring device is on. Move the tool to a safe place, manually move the tool down 50mm, and set the relative coordinate value of this point to zero again, which is the zero position of the Z axis. Record the mechanical coordinate Z value of this point in one of G54~G59. This completes the zero setting of the workpiece X, Y, and Z axes. Double check the correctness of the data again. The unilateral touch is also to touch one side of the X and Y axes of the workpiece according to the above method, and offset the relative coordinate value of the X and Y axes of this point. The radius of the touch head is the zero position of the X and Y axes, and finally put a point. The mechanical coordinates of X and Y axes are marked in one of G54~G59. Double check the correctness of the data again. Check the correctness of the zero point, move the X and Y axes to the side suspension of the workpiece, and visually check the correctness of the zero point according to the size of the workpiece. Copy the program file to the computer according to the file path of the programming work instruction.