There are many methods for surface machining of inner holes of CNC lathes. Commonly used are drilling, reaming, reaming, boring, turning, grinding, drawing, grinding, honing, and rolling holes.
- Applicable method for inner hole machining of CNC lathe machined parts:
Reaming: Reaming is to use a reaming drill to further process the drilled hole to enlarge the aperture and improve the accuracy (precision) and reduce the surface roughness value. The dimensional tolerance level that can be achieved by reaming is IT11~IT10, and the surface roughness value is Ra12.5~6.3μm. It belongs to the semi-finishing method of hole machining. It is often used as pre-machining before reaming, and can also be used as precision (precision) The final machining of holes that are not high.
1. Drilling: Drilling holes in the solid part of the workpiece with a drill. CNC machining is a process method for parts machining on CNC machine tools. The process regulations of CNC machine tool machining and traditional machine tool machining are generally consistent, but significant changes have also taken place. A machining method that uses digital information to control the displacement of parts and tools. It is an effective way to solve the problems of variable parts, small batches, complex shapes, and high precision, and to realize high-efficiency and automatic machining. The drilling is rough machining, and the dimensional tolerance grade can reach IT13~IT11, and the surface roughness value is Ra50~12.5μm. Is it due to the long length of the twist drill, the small core diameter and poor rigidity, and the influence of the chisel edge.
2. Reaming: Reaming is a finishing method for holes on the basis of semi-finishing (reaming or semi-finishing boring). In the numerical control machining, the control system issues instructions to make the tool perform various movements that meet the requirements, and the shape and size of the workpiece are expressed in numbers and letters in the form of technical requirements and machining requirements. It generally refers to the process of machining parts on CNC machine tools. In order to improve production automation, shorten programming time and reduce CNC machining costs, a series of advanced CNC machining technologies have been developed and used in the aerospace industry. The size tolerance of the reaming hole can reach IT9~IT6, and the surface roughness value can be Ra3.2~0.2μm. There are two types of reaming: organic hinge and hand hinge. Reaming on a machine tool is called machine hinge, and reaming by hand is called hand hinge.
3. Turning hole: The turning hole on the lathe is the rotation of the workpiece and the movement of the turning tool. The aperture can be controlled by the cutting depth of the turning tool and the number of passes, which is more convenient to operate. In the numerical control machining, the control system issues instructions to make the tool perform various movements that meet the requirements, and the shape and size of the workpiece are expressed in numbers and letters in the form of technical requirements and machining requirements. It generally refers to the process of machining parts on CNC machine tools. In order to improve production automation, shorten programming time and reduce CNC machining costs, a series of advanced CNC machining technologies have been developed and used in the aerospace industry. Lathe turning holes are mostly used to process the holes of disc sleeves and small brackets.
4. Boring: Boring is the further machining of holes that have been drilled, cast or forged with a boring tool. It can be performed on a lathe, boring machine or milling machine. Boring is one of the commonly used hole machining methods, which can be divided into rough boring, semi-fine boring and fine boring. The dimensional tolerance grade of rough boring is IT13~IT12, and the surface roughness value is Ra12.5~6.3μm; the dimensional tolerance grade of semi-finish boring is IT10~IT9, and the surface roughness value is Ra6.3~3.2μm; The dimensional tolerance grade is IT8~IT7, and the surface roughness value is Ra1.6~0.8μm.