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Posted on Oct 28, 2020
Milling and turning CNC machine tools refer to machine tools that can complete milling and turning, either a milling machine or a lathe. The milling machine is first used to process the propeller, mainly to avoid the reduction of accuracy and benchmark caused by two clampings!
Usually, people are curious about dynamic tool processing on a lathe or milling machine, which is commonly referred to in the industry. Even people with a background in CNC turning can sometimes be a little confused and find their understanding a bit vague, especially in the field of tools and when an additional Y-axis is needed.
Milling lathes can range from simpler 3-axis lathes (XZ&C), where the spindle becomes an angle that can be independently controlled and can be used for milling operations, to more advanced 6-axis machine tools, including linear Y-axis and W axis and ultrasonic programmable sub-spindle or sub-spindle.
On machine tools with auxiliary spindles, the W axis is used to position the auxiliary spindle for processing. This article will discuss the basics of powered tool machining and the application of the optional Y-axis on turning and milling machines, which makes it a powerful force in CNC machine tools.
A common mystery in milling and turning technology is when the Y-axis is needed and when specific features can be machined on a simpler 3-axis machine with only the C-axis. The Y-axis is only needed when the tool must be pulled from the centerline of the part.
Even in most cases, it is only necessary to machine features into the circumference of the part... The features on the surface of the part are usually in most cases. In this case, just use the C axis to complete. The Y-axis is installed using a narrow-angle "wedge" design, but even on machines with this configuration, the Y-axis always moves perpendicular to the X-axis.
:: Read more : What Is CNC Turning?
:: Read more : CNC Mill Turn Makes the Benefit of Turning Tasks
Generally speaking, turning and milling machine tools have two key components: the spindle and servo motor. The rotation movement and feed movement of the spindle can be linked together, and the turret of the CNC lathe is an additional function of the electric milling machine. Compared with separate CNC lathes and milling machines, milling lathes have the following advantages:
Increased productivity & shortened production time
The CNC milling and lathe machining center can install a variety of tools, reduce tool change time, improve processing efficiency, and can complete all or most of the processing procedures at one time, thereby greatly shortening the product manufacturing process chain. This way, the auxiliary production time caused by the replacement of the fixture is reduced, on the other hand, the manufacturing cycle and waiting time of the fixture are also reduced, which can greatly improve the production efficiency.
Reduced clamping times & increased precision
Reducing the loading time avoids the accumulation of errors due to the conversion of positioning data. At the same time, most of the current turning processing equipment has an online detection function, which can realize on-site detection and precise control of key data during the manufacturing process, which improves the processing accuracy of the product; the high-strength integrated bed design improves the gravity processing of difficult-to-cut materials Ability, in turning and milling, the tool will cut intermittently, and the workpiece formed of any material can obtain shorter chips, which makes it easier to automatically remove waste.
Moreover, intermittent cutting can give the tool enough time to cool down, reduce the thermal deformation of the workpiece, and increase the service life of the tool. Compared with traditional CNC machine tools, milling and turning have higher speed, better cutting quality, lower cutting force, improved precision of thin-walled tubes and slender shafts, and improved workpiece forming quality.
Improved machining of large components
Since the cutting speed can be divided into the rotation speed of the workpiece and the rotation speed of the tool, according to the mechanical characteristics, the same processing effect can be achieved by increasing the rotation speed of the tool and reducing the rotation speed of the tool. The function is particularly effective for the processing of large forging blanks, because reducing the speed of the forging blanks can eliminate vibration or radial cutting caused by the eccentricity of the workpiece, and the periodic change of force can ensure the smooth cutting of the workpiece and reduce the eccentricity of the workpiece.
Their rotation determines the cutting speed during turning and is related to the limitations of the main drive of the machine tool. If the drive does not allow large-mass objects to rotate at the required speed, the cutting speed is far from the optimal range, and the turning performance will be reduced. Turn-milling provides an effective way to overcome the above-mentioned difficulties.
So, in terms of productivity and accuracy, what makes turning and milling machines the real power? First, machining discontinuous surfaces may cause cutting interruptions. In classic turning, this operation can cause undesirable impact loads, poor surface finishes, and earlier tool wear.
In addition to the functions of CNC lathes, it can also complete plane milling, drilling, tapping, straight groove, spiral groove, and tooth milling. With the combined functions of turning, milling, and boring, it can realize a complete machining concept with one clamping. It is one of the fastest-growing processing methods in recent years. In turning and milling, the tool is a milling cutter, especially used for intermittent cutting with periodic loads. Processing materials will produce long chips.
In the turning process, chip handling is very difficult, and it is not easy to find the proper chip breaking geometry of the cutting tool. The milling cutter used in turning and milling generates short chips, which greatly improves chip handling. Take the processing of eccentric areas of rotating parts such as crankshafts or camshafts as an example. When turning, the eccentric mass of these components (e.g., crank journals, eccentric cams, etc.) can cause unbalanced forces, which adversely affect performance. Turning and milling the workpiece at a low speed can prevent this negative effect.
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