Surface self-centering fixture

Abstract

The invention provides a curved-face self-centering clamp which comprises a numerical control dividing head, radial locating seats, a dividing head end main shaft, a main shaft clamping spring, a radial clamping shaft, a radial clamping shaft seat, radial clamping shaft seat reset springs, radial clamping shaft reset springs, oblique roller path steel balls, oblique roller path steel ball limiting sleeves, a linear movement end main shaft, a movement end fixing seat, a linear roller path fixing seat, a linear roller path movement seat, linear roller path steel balls, a bearing, an air cylinder, an air cylinder support, a base and the like. Radial self-centering synchronous clamping can be achieved at the two ends of a shaft part, continuous numerical control rotation movement can be achieved, on the basis of the clamping principle, linear movement and rotating movement of the clamp in the axial direction are independent of each other through structural design and linear movement in the axial direction is converted into clamping movement in the radial direction of the clamp, rolling friction is mainly adopted in the clamping process, and the clamp is convenient to machine, long in service life and high in locating precision.

Description

technical field [0001] The invention relates to a curved surface self-centering fixture, in particular to a double-end synchronous curved surface self-centering fixture for curved surface shaft parts in a numerically controlled 4-axis machine tool. Background technique [0002] In mechanical processing, the parts must be reliably clamped first. Usually, the processing objects of CNC 4-axis machine tools are shaft parts with a large "length-to-diameter ratio". Except for the three linear motion axes of X, Y, and Z, CNC 4-axis machine tools There is also a rotating shaft A. The NC programming coordinate system should be set on the axis of the rotating shaft. At present, a three-jaw self-centering chuck is usually installed on the rotating shaft, and the installation method of clamping one end and adding a thimble at the other end is adopted. For circular rules It is very convenient to find the rotation center of the part, but for shaft parts with complex curved surfaces, espec...

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Problems solved by technology

[0002] In mechanical processing, the parts must be reliably clamped first. Usually, the processing objects of CNC 4-axis machine tools are shaft parts with a large "length-to-diameter ratio". Except for the three linear motion axes of X, Y, and Z, CNC 4-axis machine tools There is also a rotating shaft A. The NC programming coordinate system should be set on the axis of the rotating shaft. At present, a three-jaw self-centering chuck is usually installed on the rotating shaft, and the installation method of clamping one end and adding a thimble at the other end is adopted. For circular rules It is very convenient to find the rotation center of the part, but for shaft parts with complex curved surfaces, especially curved pipe parts, neither a three-jaw self-centering chuck nor a thimble (the middle part of the pipe part is hollow) can not be used, resulting in The difficulty of clamping shaft parts with complex curved surfaces is doubled

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