In the plane milling programming process of the CNC milling cutter
, the user must first consider cutting the workpiece. Normally, the CNC milling cutter simply enters the workpiece directly. This method is often accompanied by a large noise, which is because when the cutting blade withdraws, the thick blade produced by the chip blade is formed. Because the large impact on the working material is often caused by vibration, and the tensile stress can shorten the service life of the tool. CNC milling cutter under the action of high-speed, intermittent cutting load, the continuous accumulation of energy inside will cause the irreversible movement of the milling cutter atoms and changes in the macrostructure, and the safety of high-speed milling cutters has cross-scale correlation characteristics. In order to meet the safety requirements, the following measures can be taken: 1. Reduce the quality of the tool, reduce the number of tool parts, simplify the fracture limit of different tools of the same diameter and the quality of the tool, the number of tool parts and the number of contact surfaces of the parts Relationship between. Through comparison, it is found that the lighter the quality of the tool, the smaller the number of parts and the number of contact surfaces of the parts, and the greater the tool breakage. The higher the speed limit. 2. Improve the dynamic balance of the tool: It is very helpful to improve the dynamic balance of the tool and improve the safety of the high-speed milling cutter. Because the tool imbalance will generate additional radial load on the spindle system, its magnitude is proportional to the square of the speed. Recommended reading: Welding has a great influence on the safety of NC tools. 3. Improved tool clamping method: simulation calculation and fracture test show that the clamping method of high-speed milling cutter blades does not allow the use of normal friction clamping, and the blade with a center hole, thread clamping method or special design should be used . The cutter structure prevents the blades from flying. The direction of the clamping force of the tool base and the blade should be the same as the centrifugal force. At the same time, the screw pre-tightening force should be controlled to prevent the screw from premature damage due to overload. For small-diameter shank milling cutters, hydraulic chucks or thermal expansion and contraction chucks can be used to achieve high-precision and high-rigidity clamping. The selection method of CNC milling cutter: 1. The selection of CNC milling cutter should be based on the processing capacity of the machine tool, the performance of the workpiece material, the processing procedure, the cutting amount, the clamping size of the tool holder and other related factors. 2. The general principle of tool selection is: convenient installation and adjustment, good rigidity, high durability and high precision. On the premise of meeting the processing requirements, try to choose a shorter tool holder to improve the rigidity of tool processing.
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