There are many reasons for the damage of the thread of the vertical CNC lathe. The following is a detailed analysis of these reasons:
1. Tool problem
Tool damage:
The thread cutter may be damaged during the turning process due to wear, chipping, etc., resulting in a decrease in the quality of thread processing or even failure to complete the processing.
After the tool is damaged, if the correct tool setting operation is not performed after replacing the new tool, it may also cause thread damage.
Incorrect tool grinding:
The tool grinding angle deviation is large. For example, the ordinary triangular thread tool tip angle should be 60°, and the trapezoidal thread tool tip angle should be 30°. If these angle requirements are not met during grinding, the thread processing quality will be affected.
Failure to perform correct measurement and calibration after tool grinding may also cause thread damage.
2. Machine tool problem
Machine tool wear:
Machine tools that have been used for a long time may experience bed wear, guide rail wear, thread pressure plate wear, etc. These wears will affect the accuracy and stability of the machine tool, thereby affecting the processing quality of the thread.
Inaccurate data transmitted by the spindle encoder, or excessive movement of the X-axis, Y-axis lead screw and spindle may also cause thread damage.
Insufficient machine tool precision:
Insufficient machine tool precision, such as radial runout and axial movement of the spindle exceeding the specified range, will affect the processing accuracy and quality of the thread.
3. Cutting parameter problem
Irrational cutting parameters:
Cutting parameters include feed rate, cutting depth, cutting speed, etc. The selection of these parameters should be considered comprehensively based on factors such as workpiece material, tool material, and machine tool performance. If the cutting parameters are not selected reasonably, such as excessive feed rate, excessive cutting depth, and excessive cutting speed, the thread will be damaged.
Program compilation error:
When machining threads on CNC lathes, it is necessary to compile the correct machining program. If the program is wrong, such as incorrect lead setting and unreasonable feed path planning, it will also cause thread damage.
4. Workpiece problem
Workpiece material problem:
The physical properties of the workpiece material, such as hardness and toughness, have a great influence on the quality of thread machining. If the hardness of the workpiece material is too high or the toughness is too large, it will increase the wear and cutting force of the tool, resulting in thread damage.
Workpiece clamping is not firm:
Insecure workpiece clamping will cause the workpiece to move or deform during the machining process, thereby affecting the machining accuracy and quality of the thread.
5. Operational problems
Improper operation:
If the operator does not follow the correct operating procedures during the processing, such as not performing sufficient cooling and lubrication, not adjusting the tool height in time, etc., it may cause thread damage.
Inaccurate tool setting:
Tool setting is an important step before CNC lathe thread processing. If the tool setting is inaccurate, the relative position between the tool and the workpiece will be incorrect, thus affecting the processing quality of the thread.
In summary, the causes of vertical CNC lathe thread damage include tool problems, machine tool problems, cutting parameter problems, workpiece problems, and operation problems. In order to avoid the occurrence of thread damage, it is necessary to start from these aspects and take corresponding measures to prevent and control it.
