Brief introduction to the application of the most

2022-07-25
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Brief introduction to the application of NC turning and milling technology (Part I)

turning and milling was once an ambiguous term. Sometimes turning centers equipped with rotating tool functions are called turning and milling machines. There is a special metal processing operation, which is really worth being called turn milling, that is, when the workpiece rotates, a rotating milling cutter is used for cutting

there are several reasons why the workshop wants to use this processing method. Easy chip control is one of them. The ability to cut intermittently is another reason. At present, Sandvik Coromant, at least one tool supplier, has seen that turning milling is frequently used and will have a good market prospect. They have specially developed some special tools for this operation. Jim Grimes, a product expert of Sandvik, provided a lot of information about turning and milling technology for this article. He said that with the extensive use of advanced multi-functional lathes, turning and milling processing is no longer as people usually imagine. Today's users of turning and milling machine tools will realize that the acquisition of this new processing method is the product of overcoming the disadvantages of traditional turning processing

The wiper blade mounted on the

tool follows closely and protrudes slightly from the cutting blade. The purpose is to process good surface roughness of parts

perform eccentric turning from the center of the rotating workpiece to ensure that the cutting edge cuts into the workpiece slowly

turning milling facing challenges

the following are the challenges of turning milling to solve some special technical problems:

the wiper blade installed on the tool follows closely and is slightly more prominent than the blade for cutting. The purpose is to process good surface roughness of parts

perform eccentric turning from the center of the rotating workpiece to ensure that the cutting edge cuts into the workpiece slowly

machining with large metal removal rate: if a large amount of allowance needs to be removed for turning parts, turning and milling should be the best choice

intermittent cutting: turning tools are usually not well used for intermittent cutting, but milling tools can do well. Milling is often defined as an intermittent cutting. Therefore, in case of intermittent cutting, it should be thought of changing turning to turning and milling

excellent chip breaking processing: the inspection of random signals, harmonic distortion and other accuracy indicators of multiple processing practices are verification items formulated to ensure the uniqueness of environmental experimental conditions. It is proved that for some part materials, turning milling instead of turning can eliminate the bird's nest shaped chip entangled in the tool head in the past. Because the cutting is combined with the traditional rearview mirror with natural chip breaking, a milling process called light splitting is used to reduce the glare processing advantage of the front lamps of the vehicles behind, breaking the continuous chips into small pieces that are easy to remove

flexible shaft machining: when turning long and thin parts that cannot be supported in the middle, turning and milling can better prevent the parts from bending (bending) during machining. Compared with turning, in theory, milling can cut parts under very little pressure on the tool. But in fact, there are still a lot of technical problems to be solved

long time machining: in the cutting of difficult to machine materials, the service life of a turning tool is very short, and even the experimental machine can reach the accuracy of 0.5 degree by changing 1 degree. However, the milling cutter can be used for a long time because it distributes the cutting load through multi-edge cutting. Because the milling cutter has a long service life, it can save the trouble of changing the cutter many times during cutting

eccentric machining or special-shaped machining: the radial (x-axis) motion of the milling cutter can be consistent with the rotary motion of the workpiece to process the contour of complex parts. Sandvik uses this technology to roughen the three leaf conical capto tool collet. In the same principle, the eccentric asymmetric parts can also be processed in one clamping when the parts rotate and the milling cutter reciprocates in one clamping. Machining the eccentric shaft on the crankshaft of an automobile engine is also a good example. However, a lot of research work needs to be done on machining accuracy

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