How to process molds on CNC milling machine?

CNC milling machine processing is a high-efficiency automatic machine tool that is composed of mechanical equipment and numerical control systems and is suitable for processing complex parts. Machining centers must be used when processing molds. So what should be paid attention to in the process of machining molds in CNC milling machine processing?

1. Avoid vertical cutting. There are two types of flat-bottomed cylindrical milling cutters, one is that the end face has a center hole, and the end edge is not in the center.

The other is that there is no center hole on the end face of the CNC machining center, and the end blades are connected and pass the center. When milling a curved surface, an end mill with a center hole must not feed vertically downwards like a drill, unless the process hole is drilled in advance. Otherwise, the milling cutter will be broken. If you use an end knife without a center hole, you can feed it vertically downwards, but because the angle of the knife edge is too small, the axial force is large, so it should be avoided as much as possible. The best way is to feed the tool diagonally downward, and then use the side edge to cut laterally after reaching a certain depth. When milling the groove surface, the process hole can be pre-drilled for cutting. Although the vertical feed effect of the ball-end milling cutter is better than that of the flat-bottomed end milling cutter, it is best not to use this cutting method because the axial force is too large and the cutting effect is affected.

2. In the milling of curved parts, if the parts are found to have poor heat treatment, cracks, uneven organization, etc., the processing should be stopped in time to avoid wasting man-hours.

3. When milling a relatively complex curved surface of a mold cavity, a longer cycle is generally required. Therefore, the machine tool, fixtures, and tools should be properly inspected before each start of milling, so as to avoid failure in the middle, affecting the machining accuracy, or even Cause waste.

4. When the ball end milling cutter is milling the curved surface, the cutting speed at the tip of the ball cutter is very low. If the ball cutter is used to mill a relatively flat surface perpendicular to the machined surface, the surface quality cut by the tip of the ball cutter is relatively poor, so The spindle speed should be increased appropriately, and cutting with the tool tip should be avoided.

5. When milling the mold cavity, the repair allowance should be properly controlled according to the roughness of the machined surface. For parts that are difficult to mill, if the machined surface roughness is poor, you should leave more trimming allowance; for flat, right-angle grooves and other parts that are easy to machine, the machined surface roughness value should be reduced as much as possible to reduce the filing work To avoid affecting the accuracy of the cavity surface due to large-area repairing.