CNC tool picture CNC tool post structure diagram CNC tool post principle
CNC tool post Structure diagram
The above picture shows the structure of the square tool post commonly used in economical CNC lathes, and the tool index signal is specified by the machining program. The working process is as follows: the tool rest is lifted, the tool rest is indexed, the tool rest is positioned, and the tool rest is clamped.
CNC tool pictures
(1) tool holder Raise
When the CNC machine device issues a tool change command, the motor 1 starts normally, and the worm shaft 3 rotates through the sleeve coupling 2, thereby driving the worm gear screw 4 to rotate. The inner hole of the tool holder body 7 is machined with threads, which are screwed together with the worm gear screw, and the worm gear and the screw are an integral structure. The inner hole of the worm gear screw is in clearance fit with the central axis of the tool rest. When the tool is indexed and changed, the central axis is fixed, and the worm gear screw rotates around the central axis. When the worm gear starts to rotate, since the end face teeth on the tool holder base 5 and the tool holder body 7 are in the meshing state, and the worm gear screw is axially fixed, the tool holder body 7 is lifted.
(2) tool post indexing
When the tool post body is lifted to a certain distance Afterwards, the end face teeth of the tool holder base 5 and the tool holder body 7 are disengaged, and the index sleeve 9 is connected with the worm gear screw 4 with a pin, and rotates together with the worm gear screw. When the end face teeth are completely disengaged, the index sleeve just rotates. 160. (As shown in the figure), the ball stud 8 enters the groove of the index sleeve 9 under the action of the spring force, and drives the tool holder body to index.
(3) turret positioning
The turret body 7 is powered when it rotates When the brush holder 10 rotates, when it turns to the tool number specified by the program, the coarse positioning pin 15 enters the groove of the coarse positioning plate 6 under the action of the spring force for coarse positioning, and at the same time, the brush 13 contacts the conductor to turn the motor 1 over. Due to the restriction of the rough positioning groove, the tool holder body 7 cannot be rotated, so that it falls vertically at this position, and the end face teeth on the tool holder body 7 and the tool holder base 5 are engaged to achieve precise positioning.
(4) clamping tool holder
The motor continues to reverse, and the worm gear When the rotation is stopped, the worm shaft 3 rotates itself. When the teeth on both ends increase to a certain clamping force, the motor 1 stops rotating. The decoding device is composed of transmitters 13 and 14. The electric brush 13 is responsible for signaling, and the electric brush 14 is responsible for position judgment. When the positioning of the tool holder is over or under-positioned, the nut 12 can be loosened and the transmitter 11 can be adjusted. relative position to the brush 14 .
