Shandong Deed Precision Machine Tool Co., Ltd.
Shandong Deed Precision Machine Tool Co., Ltd.

CNC Machining Center Operation Process: a Must-have for Learning Numerical Control

DEED CNC machining industry manufacturer is going to talk about the CNC machining center operation process today, and users who need it should pay attention to collecting it!

Preparation for startup of CNC machining center

After each startup or emergency stop and reset of the machine tool, the machine tool returns to the reference zero position (i.e. return to zero) first to make the machine tool have a benchmark position for its later operations.

Clamping workpiece of CNC machining center

Before clamping the workpiece, clean all surfaces first. They cannot be stained with oil, iron filings, and dust, and use a file (or oil stone) to remove burrs from the surface of the workpiece.

The equal height iron used for clamping must be ground on all surfaces to make them smooth and flat. The clamp and nut must be sturdy and able to clamp the workpiece reliably. For some small and difficult to clamp workpieces, they can be clamped directly on a vise. The machine tool workbench should be cleaned and free of iron filings, dust, and oil stains. For workpieces with a large span, a equal height pad should be added in the middle.

According to the dimensions on the drawing, use a caliper to check whether the length, width, and height of the workpiece are qualified.

When clamping the workpiece, according to the clamping placement method in the programming guide, you need to consider avoiding the processing area and the situation where the tool may touch the fixture during processing.

After placing the workpiece on the pad iron, check the datum surface of the workpiece according to the requirements on the drawing. For workpieces that have been ground on all six sides, check whether their perpendicularity is qualified.

After inspecting the workpiece, tighten the nut to prevent the phenomenon of the workpiece shifting during processing due to clamping not being strong enough. Check it again to ensure that the error does not exceed the tolerance after it is secured.

Tool touch-off of CNC processing center

The workpiece that has been clamped can use the tool touch-off to set the machining datum position. There are two types of tool touch-off: photoelectric type and mechanical type. There are also two methods of center touch-off and single-side touch-off. The steps of center touch-off are as follows:

The photoelectric type is static, and the mechanical type has a speed of 450~600rpm. Manually move the worktable X-axis for center touch-off of the tool, so that the touch-off fixture touches one side of the workpiece. When the red light comes on, set the relative coordinate value of this point to zero. Then manually move the worktable X-axis so that the touch-off fixture touches the other side of the workpiece. When the touch-off fixture just touches the workpiece, record the relative coordinate at this time.

According to the relative value minus the diameter of the touch-off device (i.e. the length of the workpiece), check whether the length of the workpiece meets the drawing requirements.

Divide the relative coordinate value by 2 to obtain the middle value on the workpiece X-axis. 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 zero position of the workpiece X-axis.

Carefully record the mechanical coordinate value of the workpiece X-axis zero position in one of G54~G59 and let the machine tool determine the zero position of the workpiece X-axis. Check the correctness of the data again. The steps for setting the zero position of the workpiece Y-axis are the same as those for the X-axis operation.