For the problem of improving the production efficiency of cutting processing, we can solve the problem by determining the amount of back-side knife (or the amount of side-cutting knife). Under the premise of guaranteeing the quality of the machined surface, the amount of the back knife (ap) should be determined according to the stiffness of the machine tool, workpiece and tool. Under the condition of permissible rigidity, the amount of the back tool should be equal to the machining allowance of the workpiece. This will reduce the number of passes and increase productivity.

With regard to how to select the tools needed for machining, we can proceed from the following aspects:

1. When machining curved surface parts, in order to ensure that the tool cutting edge and machining contour are tangent at the cutting point to avoid interference between the cutting edge and the workpiece contour, a ball nose tool is generally used, and a two-edge milling cutter for rough machining is used to semi-finish and finish. Four-blade cutter for machining;

2. When milling a large plane, in order to increase the production efficiency and improve the surface roughness of the processing, a blade-inlaid disk-shaped milling cutter is generally used;

3. General milling cutters are generally used when milling facets or step surfaces;

4. When milling the keyway, in order to ensure the dimensional accuracy of the slot, a two-edge keyway milling cutter is generally used.

5, hole processing tool selection.

During drilling, due to the rigidity of the drill bit and poor cutting conditions, the drill diameter D should be selected to meet the conditions of L/D ≤ 5 (L is the drilling depth); before the drilling, the center drill is used to ensure the positioning of the hole machining. Accuracy; Floating reamer can be used before fine stranding, and the front hole of the reaming hole should be chamfered; when boring holes, symmetrical multi-blade boring cutter should be used for cutting to balance the boring vibration; try to select thicker and shorter ones. Arbor to reduce cutting vibrations.

The above is an elaboration of the question of "how to select the tools needed for machining." I hope to help everyone. The tool in machining is a very important accessory. How to choose the right tool directly affects the quality of the machined workpiece. Therefore, if you want to machine the workpiece with good quality, you must start with the tool selection.