The selection of the hand model tool is one of the important contents in the numerical control machining process. It not only affects the machining efficiency of the machine tool, but also directly affects the machining quality of the hand board part. Hand CNC tool is one of the preconditions for improving the machining efficiency, and its selection depends on the geometry of the part being machined, the material status, the fixture and the rigidity of the tool selected by the machine tool. The
Different tools have different uses in the NC machining process. What are the commonly used tools in the NC machining process?
Milling cutters are widely used multi-edged rotary cutters. Divided by purpose: 1) For machining planes, such as cylindrical face milling cutters, end mills, etc.; 2) For machining grooves, such as end mills, T-knifes, and angle cutters; 3) Forming the surface Used, such as convex semi-circular and concave semi-circular cutters and milling cutters for machining other complex forming surfaces. The productivity of milling is generally higher and the roughness of the machined surface is greater.
2. Turning tool
The turning tool is the most widely used tool in metal cutting. It can process outer circle, end plane, thread, inner hole on lathe, can also be used for cutting and cutting. The turning tool can be divided into an overall turning tool, a welding-assembly turning tool and a mechanical clamping blade. The lathes that mechanically clamp the blades can be further classified into machine tools and indexable tools. Mechanical cutting tools have stable cutting performance and workers do not need to sharpen the knife, so they are increasingly used in modern production.
3. Hole machining tool
Hole machining tools can generally be divided into two categories: one is tools that drill holes from solid materials, and are commonly used for twist drills, center drills, deep hole drills, etc.; Machining tools, commonly used reamers, reamers and sickles. For example, the following figure shows the structure of a standard high-speed steel twist drill. The front end of the working part (knife body) is a cutting part, which is responsible for the main cutting work. The rear end is a guide part, which acts as a guide bit and is also a backup part of the cutting part. The
Broach is a kind of multi-tooth tool with high processing precision and cutting efficiency. It is widely used in mass production and can process various internal and external surfaces. The broach can be divided into various types of inner broaches and outer broaches according to the surface of the workpiece being machined. When using broaching, in addition to selecting the rake and back angles of the teeth according to the workpiece material, the broach size is determined according to the size of the workpiece surface (such as the diameter of the round hole), and two parameters need to be determined: (1) teeth Raising angle af [that is, the difference between the radius or height of the front and rear two teeth (or set of teeth)]; (2) The pitch p [that is, the axial distance between two adjacent teeth].
5. Gear cutter
Gear cutters are tools used to machine gear teeth. According to the working principle of the cutter, gears are divided into forming gear cutters and generating gear cutters. Commonly used forming gear cutters have disc gear cutters and finger gear cutters. The commonly used generating gear cutters include a pinion cutter, a gear hob, a shaver, and the like. When selecting the gear hob and shaper cutter, the following points should be noted: (1) The basic parameters of the tool (modulus number, tooth profile angle, tooth tip height coefficient, etc.) should be the same as those of the machined gear. (2) The tool accuracy level should be equivalent to the precision level required for the machined gear. (3) The tool rotation should be as same as that of the gear being machined. When a spur gear is rolled, a left-handed cutter is generally used.