Precision CNC machining is a part of machining. There are two main types of machining: one is to fix the turning tool and process the unformed workpiece during rotation; the other is to fix the workpiece and rotate the workpiece at high speed. (Tool post) horizontal and vertical movement for precision machining. CNC lathe processing usually consists of control system, servo system, detection system, mechanical transmission system and other auxiliary systems.

The materials usually processed by lathes are free-cutting steel and copper. Free-cutting steel contains high sulfur S and phosphorus P. Sulfur and manganese exist in the form of manganese sulfide in steel, while manganese sulfide is in steel. Plays the role of lubrication, makes the steel easier to cut, thereby improving the production schedule of the lathe.

The principle of choosing a reasonable tool for precision CNC machining: a. When roughing, choose a tool with high strength and good durability, so as to meet the requirements of large-back tooling and large feed when roughing. b When finishing turning, choose high-precision and durable tools to ensure the requirements of machining accuracy. c In order to reduce the time for tool change and facilitate tool setting, machine clamped knives and machine clamped blades should be used as much as possible.

Precision CNC machining to obtain good machining quality. Constant cutting load. Through calculation to obtain a constant cutting layer area and data removal rate, many CAM software currently developed can maintain constant cutting conditions through the following measures. Keep the cutting load and tool wear rate balanced to improve tool life and machining quality. Prevent sudden change of tool feed direction. Prevent the tool from being buried in the workpiece.

For example, when processing the mold cavity, the tool should be prevented from being inserted into the workpiece vertically, and the inclined cutting method should be used. The usual inclination angle is 20°30°) It is best to use the spiral cutting tool to reduce the tool load; when processing the mold core, try to The tool is first cut from the outside of the workpiece and then cut into the workpiece horizontally.

When cutting in and cutting workpieces with precision CNC machining, inclined or arc cutting in and out should be used as much as possible to prevent vertical cutting in and out. Climbing cutting can reduce cutting heat, reduce tool stress and work hardening level, and improve processing quality. The main goal of semi-finishing mold semi-finishing is to make the contour of the workpiece flat and the surface finish machining allowance is uniform. This is especially important for tool steel molds, because it will affect the change of the cutting layer area of ​​the tool and the change of the tool load during finishing. , Thereby affecting the stability of the cutting process and the quality of the finishing appearance