What is the Difference Between CNC Turning and Boring Machining?

Those who are familiar with CNC machining and turning know that CNC machining turning parts do rotating motion, which is suitable for machining circular turning parts. And boring to enlarge the hole or the inner diameter is a kind of processing method, for these two methods, many people are not clear about the difference between the two methods.

In order to better understand the difference between these two methods, we will start to explain to you around the following points.

The Difference Between the Two Processing Methods

CNC Machining Turning

Turning is a part of CNC machining. Use the rotary motion of the CNC turning parts and the linear or curved motion of the tool to change the shape and size of the blank, and process it to meet the requirements of the drawing. It is used for CNC turning of the inner and outer cylindrical surface, end surface, conical surface, forming surface and thread of parts. During CNC turning, drills, reamers, reamers, taps, dies and knurling tools can also be used for CNC turning. Although it looks like a complex CNC turning process, it is actually the most basic and common cutting process method.

CNC Machining Boring

Boring is a kind of finishing. It uses a rotating single-edged boring tool to enlarge the reserved holes on the CNC turning parts to a certain size, so that it can achieve the required accuracy and surface roughness for cutting. Boring is generally carried out on a boring machine or a machining center and a combined machine tool. It is mainly used to process cylindrical holes, threaded holes, grooves and end faces on CNC machined turning parts such as brackets, cavities, and bases. When special accessories are used, the inner and outer spherical surfaces, taper holes, etc. can also be processed by CNC. The boring accuracy of steel materials can generally reach IT9～7, and the surface roughness is Ra2.5～0.16μm.

The difference between CNC turning and boring is that one mainly uses a turning tool to turn a rotating workpiece, while the other uses a tool to expand the hole or other circular contour inner diameter cutting process.
 

Difference in Processing Size

Turning is a cutting process in which the turning tool moves in a straight line or a curve in a plane to achieve the required size, while boring is to use a rotating single-edged boring tool to enlarge the prefabricated hole on the workpiece to a certain size.

Different Methods used in CNC Turning and Boring

When CNC machining and boring, the CNC machining and turning parts are installed on the machine tool fixture or the machine tool table, and the boring tool is used to clamp on the boring bar (also can be integrated with the boring bar), and the spindle is driven to rotate. When using a boring die, the boring bar is floatingly connected to the spindle, and the accuracy of CNC machining depends on the accuracy of the boring die; when the boring die is not used, the boring bar is rigidly connected to the spindle, and the accuracy of CNC machining depends on the accuracy of the machine tool.

Numerical control turning is to use different turning tools or other tools on the lathe, which can rotate and machine various surfaces, such as thread, groove, end surface, inner and outer cylindrical surface, inner and outer conical surface and forming surface, etc. The surface roughness is Ra The value is 1.6 to 0.8, and the machining accuracy can reach IT8 to IT7. CNC turning is commonly used to process single-axis CNC turning parts, such as straight shafts, general disks, and sleeve parts.

Features of Turning and Boring

Features of CNC Turning

1. High efficiency of CNC turning

CNC turning has higher efficiency than grinding. Turning often uses large cutting depths to make CNC machined turned parts rotate at high speeds. The metal removal rate is usually several times that of grinding. In CNC turning processing, multiple surface processing can be completed in one clamping, while grinding requires multiple installations, so the auxiliary time is short and the position accuracy between the processed surfaces is high.

2. Suitable for small batch flexible production requirements. The lathe itself is a flexible CNC turning processing method with a wide range of processing. The lathe is easy to operate and fast in turning and clamping. Compared with grinding, hard turning can better meet the requirements of flexible production.

3. Hard CNC turning processing can make the parts obtain good overall machining accuracy

4. The cost of equipment investment is low. When the productivity is the same, the investment of the lathe is obviously better than that of the grinder, and the cost of the auxiliary system is also low. For small batch production, CNC turning processing does not require special equipment, while large batch processing of high-precision CNC turning parts requires CNC machining machines with good rigidity, high positioning accuracy and high repeat positioning accuracy.

Characteristics of data boring machining

1. Since the boring machine has many forms of motion, the CNC turning processing is placed on the worktable, which can conveniently and accurately adjust the position of the machined hole and the tool, thus ensuring the mutual position accuracy of the machined hole and other surfaces.

2. It can correct the axis skew and position error of the original hole.

3. The tool structure is simple, and the radial size can be adjusted, and holes with different diameters can be machined with one tool.

4. The quality of boring mainly depends on the accuracy of the CNC machining machine tool and the technical level of the workers, so the technical requirements for the operators are very high.

5. Compared with reaming, single-edge boring tools have poor rigidity and use a smaller cutting amount, so the productivity is low, and it is not easy to ensure stable machining accuracy.

6. It is not suitable for CNC turning parts with elongated holes.

Summarize                

CNC turning and boring are both machining. In actual operation, they should be distinguished due to different ways of using them. This article takes you to understand the difference between turning and boring. I hope you can consider the location and method of CNC turning parts when choosing materials for processing, so that you can choose the best CNC machining method.