The acceleration section and the deceleration section are the controllers of the numerical control system. According to the spindle speed and pitch information, combined with the system's own settings or “default†parameters, the “fixed†mode is pre-programmed, and the fixed mode of the acceleration section and the deceleration section is programmed. The start and end stages of the turning of the knife are strictly in accordance with the mode.
Generally, thread processing is not possible with only one knife. It is often necessary to drive a few knives or dozens of knives. Then the second and third knives of the car until the last knive, each knife must first find the starting point on the circumference of the workpiece. That is to find the starting point, and the running and descending sections must be exactly the same, only the depth direction (ie X direction) changes. As long as one of the starting point, the running-up section and the speed-reducing section is slightly changed, there will be a phenomenon that the first knife can not cover the previous knife, which is commonly known as "disordered teeth".
When the CNC lathe is in the thread of the machine, the controller is also in the state of “spiritual height concentrationâ€. When the spindle is rotating, the spindle rotation information is continuously sent back to the controller by the detecting device in the form of a pulse signal. According to the pulse according to the pitch requirement, the “forward command is issued in time. If there is taper and the end is closed, it is more busy. The schematic diagram is shown in Figure 2.
figure 2
The above four points are the basic processing characteristics of the CNC lathe thread. Then analyze the closing and closing, as shown in Figure 3.
image 3
The closing of the end is in the thread turning process, the X axis is used for the infeed and retracting motion when the pitch is constant. It has the following characteristics:
The closing end is outside the run-up and deceleration sections, at both ends of the constant speed section, namely the BE and FC sections.
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