Thread milling is to use thread milling tools, the machining center is three-axis linkage, that is, X, Y axis circular interpolation, Z axis linear feed milling method to process threads.
⑵The scope of application of milling tools is wide. As long as the pitch is the same, no matter whether it is a left-hand thread or a right-hand thread, one tool can be used, which is helpful to reduce the cost of the tool.
⑶ Milling is easy to remove chips and cool, and has better cutting performance compared with taps. It is especially suitable for thread processing of difficult-to-machine materials such as aluminum, copper, and stainless steel. It is especially suitable for thread processing of large parts and components of precious materials. Ensure the quality of thread processing and the safety of the workpiece.
Thread milling tools can be divided into two types, one is a machine-clamped cemented carbide blade milling cutter, and the other is an integral cemented carbide milling cutter. The machine clamp tool has a wide range of applications. It can process holes with a thread depth less than the length of the blade, and can also process holes with a thread depth greater than the length of the blade. Integral cemented carbide milling cutters are generally used to machine holes whose thread depth is less than the length of the tool.
The programming of thread milling tools is different from that of other tools. If the machining program is programmed incorrectly, it is easy to cause damage to the tool or error in thread processing. Pay attention to the following points when compiling:
⑴First of all, the threaded bottom hole should be processed well, the small diameter hole should be processed with a drill, and the larger hole should be boring to ensure the accuracy of the threaded bottom hole.
⑵ When cutting in and out, the tool should adopt the arc trajectory, usually 1/2 circle for cutting in or out, and the Z-axis direction should travel 1/2 pitch to ensure the thread shape. The tool radius compensation value should be brought in at this time.
⑶X, Y axis circular interpolation one circle, the main shaft should travel a pitch along the Z axis direction, otherwise, it will cause the thread to buckle randomly.