Centering fixture for CNC machine tools

Abstract

The invention discloses a centering fixture for a numerical control machine tool and relates to the technical field of numerical control machine tools. The invention comprises an outer cylinder, the inner side of the opening end of the outer cylinder is provided with a limit end ring; the inner wall of the outer cylinder is rotatably connected with a threaded sleeve; the inner wall of the end of the threaded sleeve is threadedly connected with a clamping frame; ring; the annular array on the inner wall of the outer cylinder is equipped with a fixed seat; the top of the fixed seat is rotatably connected with a transmission frame that is intermeshed with the threaded sleeve; the outer cylinder is rotatably connected with an active ring gear that is intermeshed with the transmission frame through the second annular groove . In the present invention, when the driving gear rotates, it is engaged with the gear ring for transmission, and the limit guide block inside the gear ring is matched with the limit guide groove on the side surface of the rod at the end of the thread, and under the limit action of the guide rod and the guide sleeve, it can Adjusting the distance of a single clamping frame can realize the centering clamping and fixing of the eccentric workpiece, and the operation is simple, the construction is convenient, and the installation clamping force is strong, which meets the needs of actual processing.

Description

technical field [0001] The invention belongs to the technical field of numerical control machine tools, in particular to a centering fixture for numerical control machine tools. Background technique [0002] CNC machine tool is a high-precision and high-efficiency automatic machine tool, equipped with multi-station cutting tools, has a wide range of processing performance, and can process complex workpieces such as straight cylinders, oblique cylinders, arcs and box threads, grooves, worms, etc. It has various compensation functions such as linear interpolation and circular interpolation, and has played a good economic effect in the mass production of complex parts. [0003] At present, CNC machine tools generally use chucks to clamp parts such as shafts and pipes. When the disk is locked, when the small bevel gear is pulled with a wrench or a drive motor, the wire will rotate. The flat thread makes the jaws approach or withdraw from the center at the same time. Because of...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of centering fixture for numerical control machine tools, through the cooperative use of outer cylinder, threaded sleeve, clamping frame, gear ring, driving gear, transmission frame and driving ring gear, solves the problem of existing numerical control The centering clamping operation of the machine tool for the eccentric workpiece is complex and the clamping force is small

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