In this part of the numerical control transformation, the Y-direction stepping motor is directly connected with the input worm of the indexing head. Because the transmission ratio of the indexing head is i=1:40, the Y-direction stepping motor rotates by 1 revolution to drive the indexing head spindle. Rotate 1/40 rpm, Y rotates 40 rpm to the stepping motor, which can drive the indexing spindle to rotate 1 revolution. It can be seen from the spindle drive system of the lathe (see the drawing) that the spindle of the indexing head rotates by 1 turn, which drives the XI axis of the lathe to rotate by 1 turn. After driving by (33/33)×(58/58), the spindle of the lathe VI is driven to drive the workpiece. ) Turn 1 turn. Previous page next page flat lifting sling,polyester flat webbing sling,flat lifting sling price Jiangsu Zhongyi Work Rigging Co., Ltd. , https://www.zy-rigging.com
In the X-direction running control of the CNC lathe, the X-direction stepping motor is directly connected to the transverse ball screw. When the running length of P=5mm (pitch of the lateral ball screw) is given, the ball screw rotates by 1 turn, X The stepping motor is also rotated by 1 revolution. Since the Y-direction stepping motor is the same as the X-direction stepping motor, it can be known that when the pitch of the matched lead screw of the Y-direction stepping motor P (P=5 mm), the Y-direction stepping motor can be rotated by 1 turn; Given the Y-direction running length L y = 5 × 40 = 200 (mm), the Y-direction stepping motor can be rotated by 40 revolutions, and the spindle of the lathe can be controlled to rotate the workpiece by one revolution, so that the rotating operation of the workpiece can be realized. Through the Y-direction stepping motor, the advantage of controlling the F W160 universal indexing head to drive the workpiece to achieve the rotary motion is also: because the transmission ratio i in motion is increased, the rotational motion of the workpiece runs slowly, thus causing the workpiece to rotate. The accuracy is greatly improved, and at the same time, the torque for controlling the rotation of the workpiece by the Y-direction stepping motor is multiplied (the static torque of the Y-direction stepping motor is 1.2 N·m, so 1.2×40=48 (N·m). The "Machine Repair Manual" found that adjusting the tension of the clutch spring can obtain different ultimate pressures. When the cutting torque exceeds 20 N·m, the motion is forcibly interrupted and the fuse is activated. It can be judged that the output of the Y-direction stepping motor can be judged. The torque is greater than the required torque when the spindle of the lathe and the workpiece rotate. It is very conducive to the reliable operation of the machining and the accurate control of the accuracy. At the same time, the stepping motor increases the locking force of the moving direction when the stationary state (ie, the spindle of the lathe does not rotate), so that the reliability is improved and guaranteed. After numerical control transformation, the CNC lathe has the functions of three-coordinate linkage and three-coordinate any two-two linkage and machining functions of turning and milling.
2. CNC car milling method processing principle
After the horizontal lathe is modified by CNC, the spindle of the lathe has three kinds of motion forms: 1 The lathe spindle is controlled by the Y-stepping motor to control the F W160 universal indexing head (to drive the workpiece) to realize the rotary motion. 2 The spindle of the lathe does not rotate (the spindle of the lathe is in the neutral position, and the Y-direction controlled by the numerical control subsystem is zero). 3 The lathe spindle is controlled by the original spindle motion of the lathe (the FW160 universal indexing head 3 is connected to the left end of the XI axis, and the gear of z=100 is installed to restore the connection of the original structure).
The numerical control main system controls the longitudinal (Z-direction) movement of the lathe and the lateral (X-direction) movement of the lathe, and can perform various processing functions of the numerical control system under different rotating operation modes of the lathe spindle. The numerical control subsystem controls the main axial direction (Y direction) of the lathe, which can realize the rotating operation of different forms and speeds of the lathe spindle. The numerical control main system can control the operation of the Z-direction motion and the X-direction motion separately, or can realize the linkage operation of controlling the Y-direction motion simultaneously with the numerical control subsystem.
The numerical control subsystem (control Y direction) is controlled by the control command of the numerical control main system (control X direction, Z direction). The numerical control main system first controls the X-direction and Z-direction to perform the interpolation operation of various required trajectories on the surface of the workpiece, and then starts the numerical control subsystem by using the signaling command. At this time, the numerical control subsystem should be started in the pause waiting state. Since the signaling command also takes time in the process of starting the numerical control subsystem operation, the delay time of the numerical control main system can be adjusted by actually measuring the rotation error of the workpiece, so that the two sets of numerical control systems control the moving motions simultaneously. CNC machining into the desired trajectory.