Three-jaw built-in CNC chuck

CNC pneumatic three-jaw chuck, specifically involves a three-jaw built-in CNC chuck.

Technology introduction: Three-jaw chuck is also called three-jaw self-centering chuck. Depending on the position of the jaws, the three-jaw chuck can be roughly divided into external and internal types. At present, the principle of clamping the workpiece by the jaws of the built-in CNC chuck is similar to the expansion screw. The workpiece needs to be placed in the chuck, and then the direction of the clamping point of the clamping jaw points to the center of the chuck using the screw. A chuck with this structure takes a lot of time to clamp a workpiece once, and the work efficiency is low.

Technical implementation idea: The technical solution to be solved is to provide a three-jaw built-in CNC chuck, which can quickly clamp workpieces. The technical solution is implemented as follows: a three-claw built-in CNC chuck includes a circular body, a circular groove is provided upward on the back of the circular body, the notch of the circular groove is covered with a circular cover plate, and a circular through hole is provided at the center of the circular cover plate; the side walls of the circular body are provided with three Equiangular circular array of threaded chute, each chute is inserted with a sliding shaft, the inner groove wall of the circular groove is provided with a gap connected to the chute corresponding to each chute; the center of the bottom of the circular groove has a circular through hole 2, and there are three equiangular arrays around this circular through hole 2 There are upwardly concave elongated placement grooves. One end of these three placement grooves is connected with the circular through hole 2; a circular middle plate is placed in the circular groove, and there is a circular through hole 3 at the center of the middle plate. The outer circular side wall of the middle plate has three lugs located in the gap; one end of the sliding shaft against the lugs; a tab is placed in each of the placement slots, and the back of the tab has a downwardly protruding convex point; the front side of the middle plate is provided with a waist-shaped hole corresponding to each of the placement slots, and a tab ring is placed in the waist-shaped hole. The convex point is inserted into the tab ring for fixation. Furthermore, an O-ring is installed at the notch of the circular groove. Furthermore, an O-ring is installed at each end of the sliding shaft. Furthermore, one end of the chute is a closed end. Further, one end of the sliding shaft inserted in the chute has a spring mounting hole, a spring is placed in the spring mounting hole, and the other end of the spring passes from below the lug and is connected to the closed end of the chute. Furthermore, the first, second and third circular through holes are coaxially arranged, the diameter of the second circular through hole is the same as the diameter of the third circular through hole, and the diameter of the second circular through hole is larger than the diameter of the first circular through hole. Furthermore, the front opening of the circular through hole 2 is set in a trumpet shape, and the taper is 16°. Further, the front opening of the circular through hole one is set in a trumpet shape, and the taper is 90°.

The three-jaw built-in CNC chuck provided has two methods of manual clamping and pneumatic clamping. Manual clamping inserts the round rod-shaped workpiece into the chuck from the circular through hole 2, and then rotates the sliding shaft and inserts it into the chute. As the sliding shaft is inserted deeper, the sliding shaft pushes the middle plate to rotate. While the middle plate rotates, it drives the three tabs to gather toward the center of the circular through hole 3. When the lugs hit the gap, stop pushing the sliding shaft. At this time, you only need to lock a stop screw at the opening of the chute to complete the clamping of the workpiece. When the workpiece needs to be disassembled, you only need to remove the stop screw, and the sliding shaft will automatically pop up under the action of the spring. At this time, the workpiece can be easily pulled out. Pneumatic clamping inserts the round rod-shaped workpiece into the chuck from the circular through hole 2, and then starts the cylinder to rotate the sliding shaft and insert it into the chute. As the sliding shaft is inserted deeper, the sliding shaft pushes the middle plate to rotate. While the middle plate rotates, it drives three tabs to gather toward the center of the circular through hole 3. When the preset stroke of the cylinder is reached, the sliding shaft stops pushing, and the lugs hit the right gap. Since the power source of pneumatic clamping is the cylinder, there is no need to install a spring. From this, it can be seen that the provided pneumatic chuck can achieve fast and precise installation of workpieces.