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Selection of Surface CNC Lathe Inner Hole Machining Method

Selection of Surface CNC Lathe Inner Hole Machining Method

There are many methods for machining the inner surface of CNC lathe machining parts. Commonly used are drilling, reaming, reaming, boring, turning, grinding, pulling, grinding, honing, rolling and so on.
The applicable method of inner hole processing of CNC lathe machining parts:
Reaming: Reaming is to use a reamer to further process the drilled holes to expand the aperture (aperture) and improve the accuracy (accuracy) and reduce (reduce) the surface roughness value. The dimensional tolerance grade that can be achieved by reaming is IT11 ~ IT10. The surface roughness value is Ra12.5 ~ 6.3μm. It belongs to the semi-finishing method of holes. It is often used for pre-processing before reaming. Degree) final machining of holes that are not high.

1. Drilling: Machining holes in the solid part of the workpiece with a drill is called drilling.

CNC machining is a process method for parts processing on CNC machine tools. The process specifications of CNC machine tool processing and traditional machine tool processing are generally the same, but obvious changes have also occurred. Mechanical processing method that uses digital information to control parts and tool displacements. It is an effective way to solve the problems of parts variety, small batch size, complex shape, high precision, etc., and to achieve efficient and automated processing. Drilling is rough machining, and the dimensional tolerance level that can be reached is IT13 ~ IT11, and the surface roughness value is Ra50 ~ 12.5μm. This is because the length of the twist drill is long, the diameter of the drill core is small and the rigidity is poor, and it has the influence of the transverse edge.

2. Reaming: Reaming is a finishing method for holes on the basis of semi-finishing

In numerical control processing, the control system sends out instructions to make the cutter perform various movements that meet the requirements, and expresses the processing of technical requirements and processing requirements such as the shape and size of the workpiece in the form of numbers and letters. It generally refers to the process of processing 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 also been developed and used in the aerospace industry. The size tolerance of reaming holes can reach IT9 ~ IT6, and the surface roughness value can be Ra3.2 ~ 0.2μm. There are two types of reaming holes: organic hinge and hand hinge. Reaming on a machine tool is called a machine hinge, and reaming by hand is called a hand hinge.

3. Lathe hole

The lathe hole on the lathe is the rotation of the workpiece and the movement of the lathe. The aperture size can be controlled by the cutting depth of the lathe and the number of passes, which makes the operation more convenient. In numerical control processing, the control system sends out instructions to make the cutter perform various movements that meet the requirements, and expresses the processing of technical requirements and processing requirements such as the shape and size of the workpiece in the form of numbers and letters. It generally refers to the process of processing 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 also been developed and used in the aerospace industry. Lathe holes are mostly used for processing holes for disc sleeves and small brackets.

4. Boring: boring is to use boring tools to further process the holes that have been drilled, cast or forged.

It can be performed on a lathe, boring machine or milling machine. Boring is one of the commonly used hole processing methods, which can be divided into rough boring, semi-fine boring and fine boring. The size tolerance level of rough boring is IT13 ~ IT12, the surface roughness value is Ra12.5 ~ 6.3μm; the size tolerance level of semi-precision boring is IT10 ~ IT9, the surface roughness value is Ra6.3 ~ 3.2μm; The dimensional tolerance level is IT8 ~ IT7, and the surface roughness value is Ra1.6 ~ 0.8μm.

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