Cam correction mechanism used for stroke error of ball screw assembly

Abstract

The invention discloses a cam correction mechanism used for the stroke error of a ball screw assembly. The cam correction mechanism comprises two planker side plates and a frame, wherein the two planker side plates are vertically arranged in a spaced mode. The two ends of a long sleeve are connected through surface bearings and the two planker side plates. The side wall of the middle portion of the long sleeve extends outwards and is fixedly provided with a roller column. The end, away from the long sleeve, of the roller column is sleeved with a bearing. The bearing is attached to and supported on a cam. A friction plate is arranged between the bearing and the cam. According to the cam correction mechanism, a nut is connected with plankers, and when a ball screw rotates, the nut drives the plankers to move linearly along the ball screw in the axial direction; the roller column is fixed to the nut, the square bearing is installed at the end of the roller column, the square bearing is attached to and supported on the friction plate, both the bearing and the friction plate make contact with the cam and bear the jacking force generated during rotation of the cam, the cam pushes the bearing to move upwards, and thus auxiliary rotation of the nut is generated; and the linear error and cyclic error of the stroke are corrected and compensated, and the stroke precision is substantially improved.

Description

technical field [0001] The invention relates to the technical field of ball screw pairs, in particular to a cam correction mechanism for ball screw pair stroke errors. Background technique [0002] The ball screw pair or ball screw pair is composed of two sets of screw and nut. It is the transmission device with high precision and the most commonly used transmission device in transmission machinery at present. For example, the application number is CN200820078944.0, and the invention name is a Chinese patent of a ball screw assembly. [0003] At present, the stroke error of the ball screw pair is already very small, but it still cannot meet the requirements of use and needs to be further improved. When the screw rotates, the nut is fixed on the carriage to move in a straight line, and the movement accuracy of the carriage depends on For the ball screw pair, the movement accuracy of the nut is directly related to the stroke error of the screw. For example, the application ...

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Problems solved by technology

[0003] At present, the stroke error of the ball screw pair is already very small, but it still cannot meet the requirements of use and needs to be further improved. When the screw rotates, the nut is fixed on the carriage to move in a straight line, and the movement accuracy of the carriage depends on Ball screw pair, the movement accuracy of the nut is directly related to the stroke error of the screw

For example, the application number is CN201410786365.1, and the invention name is the processing technology of multi-threaded ball nuts, which discloses a processing technology of multi-threaded ball nuts, which specifically includes the following steps: 1) quenching and tempering after the nut blank is roughly turned out of the shape of the nut Processing; 2) Finishing the profile of the above-mentioned nut and the internal thread raceway; 3) Assembling the nut prepared in step 2) with the standard lead screw, and preloading the nut by increasing the diameter of the steel ball multiple times to make the nut in the standard Rotate and run-in on the lead screw, thereby reducing the machining error of the nut by rolling the steel ball, so that the nut meets the assembly requirements; 4) Carry out nitriding treatment on the nut processed in step 3); overcome the existing processing technology Large lead, multi-threaded ball screw pair has the difficulty of large error and low precision

[0004] However, relying solely on the process to reduce the stroke error and improve the accuracy cannot meet the requirements of use. The method of automatic correction and compensation is adopted to improve the stroke accuracy and meet the requirements of use.

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