Briefly describe the classification of sickles

Sickles are a very common tool for reaming. For many machines, boring boring (such as lathes, milling machines, boring machines, and combination machines) can be used. The machining accuracy of the boring can reach IT6~IT8, and the surface roughness Ra can reach 6.3μm~0.8μm. It is often used for roughing, semi-finishing and finishing of larger diameter holes. According to the structure and use of the file, it can be divided into single-blade boring tool and multi-blade boring tool.

â—†Single blade file

The single-edged boring tool has a cutter head structure similar to that of the turning tool. It has only one main cutting edge. It has a simple structure, is easy to manufacture, and has high versatility, but the rigidity is much worse than that of the turning tool. Therefore, single-edged boring tools usually have larger main and negative declination angles, smaller blade inclination angles, and tool nose radius to reduce the radial force during cutting.

â—†Single edge cutting

Single-edge boring can be used for finishing operations and roughing and finishing of demanding materials for cutting control. It can also be used as a solution when machine power is limited.

â—†Multi-edge cutting

Multi-blade boring consists of two or three cutting edges that can be used for roughing operations where material removal rate is the preferred factor, by using two- or three-edged tools and setting the blades to the same axial height And processing under the recommended feed per tooth, high production efficiency can be obtained, and the hole is processed through the high feed per revolution.

The two cutting edges of the double-edged boring tool are simultaneously cut at two symmetrical positions, so that the machining error caused by the action of the radial cutting force on the mast can be eliminated. When the boring tool is cut, the diameter of the hole is ensured by the tool. The outer diameter of the tool is determined according to the hole diameter of the workpiece. The structure is more complicated than the single-edged boring tool. The blade and the shank are difficult to manufacture, but the productivity is high. Therefore, it is suitable for occasions where the processing precision is high and the production volume is large.

Step boring refers to the machining of the roughing process by setting the blades to different axial and radial dimensions. Good control of iron filings is achieved when machining special materials with a cutting allowance of 1 or 1.5 times the length of the cutting edge of the insert. Smaller iron filings are obtained when the cutting allowance is only 0.5 times the cutting edge length.