In the process of processing, different thread requirements are different. The methods and methods are different. The trapezoidal thread has a long length, a large pitch, a deep cutting, a large cutting force, a high accuracy requirement, and a difficult machining. The cutting depth of the tool is the same, so the force on the cutting edges on both sides of the thread turning tool will increase sharply with the increase of the material removal rate, resulting in a decrease in thread accuracy and tool damage. And each time the cutting depth must be reduced according to a certain proportion, the internal thread and the external thread are relatively common, and the general processing is less difficult, pay attention to the calculation of the thread bottom.
Today we will tell you about the main methods of thread cutting of CNC lathes:
1. Grooving rough cutting method, first use a grooving knife smaller than the width of the thread turning tool bit to roughly cut a groove, and then use a thread turning tool to perform thread processing. Large pitch threads are often used, but the operation and programming are extremely tedious.
2. Stagger cutting method, thread turning tools are staggered in the direction parallel to the left and right side of the tooth, until the bottom of the tooth, which is very suitable for large thread cutting, but the programming is more complicated.
3. The oblique feed method refers to the feed in the Z direction and the X direction are also linked to form a slanted feed method. At this time, the thread turning tool always has only one cutting edge to participate in cutting, and the chip removal is smooth. It is smaller than the straight-forward method, but when the thread depth is deep and the pitch is large, it is easy to produce the phenomenon of trowel.
4. Straight forward method refers to the linear movement of the Z direction does not change when the lathe is cutting, and the X direction feeds a cutting depth in a convenient, fast and efficient manner. Usually, ordinary threads with smaller pitches can be used, but the turning tool is easy. Worn, chips can scratch the thread surface.
CNC turning and milling processing is professional, if you need, please send email to [email protected].The cnc prototyping services by Ruiyi.
FAQ:
Trapezoidal threads have long lengths, large pitches, and deep cuts. They require high cutting forces and precision. These conditions make machining more complex and increase the risk of tool damage.
The cutting force on both sides of the thread turning tool rises sharply as material removal increases. This reduces thread accuracy, accelerates tool wear, and makes machining more difficult
Each cut must reduce depth step by step, according to a certain proportion. This ensures tool life and maintains thread accuracy.
No. Internal and external threads are more common and generally easier to process than trapezoidal threads. The main concern is accurately calculating the thread bottom.
This method first uses a narrow grooving tool to cut a groove. Then a thread turning tool processes the thread. It works well for large-pitch threads, but the operation and programming are tedious.
The thread turning tool cuts alternately along the left and right sides of the tooth profile until reaching the bottom. This method is suitable for large threads but requires complex programming
In this method, the tool feeds diagonally, linking movement in the Z and X directions. Only one cutting edge engages at a time, which improves chip removal. However, for deep and large-pitch threads, this method may cause tool chatter or poor surface quality.
The tool moves linearly along the Z direction while incrementally feeding in the X direction. It is fast and efficient for small-pitch threads but can cause tool wear and surface scratches due to chip buildup.
The grooving rough cutting method and stagger cutting method are often preferred because they can handle the heavy cutting forces involved in large-pitch thread machining.
RuiYi specializes in CNC turning and milling with expertise in various thread cutting methods. Customers can contact [email protected] for professional CNC prototyping and machining services tailored to their needs.
