Compensation mechanism of finish boring hole cylindricity error

Abstract

The invention provides a compensation mechanism for the cylindricity errors of fine-bored holes. As the radial wall thickness in the axis direction of an engine cylinder hole is not uniform in distribution, after the engine cylinder hole is linearly bored by a conventional machining method, the cylindricity of the hole is in a waist-drum shape. Parameters of an inverse waist-drum shape are input into a numerical control program after measurement, analysis and calculation. The cylinder hole is subjected to coaxial graded semi-fine boring and fine boring by pushing and pulling a boring bar, and rapid semi-fine boring can be carried out to the cylinder when the boring bar goes down. When the boring bar 1 goes up, a compensation servo motor 9 is started, the expansion amount of a pull rod 3 on the core part of the boring bar is accurately positioned and controlled through the servo motor; a 1-degree inclined plane on the pull rod 3 pushes a fine-boring cutter table 4 to elastically stretch out so as to enable a fine boring cutter 5 to be in a working position of fine boring size; and the fine boring cutter completes the final fine boring of the cylinder hole according to a parameter program of the inverse waist-drum shape, so that the cylindricity of the cylinder hole is effectively improved. Through the setting of the program, the side generatrix of the fine-bored holes can be a curved line or an irregular straight line by programming.

Description

Technical field [0001] The utility model relates to a compensation mechanism for the cylindricity error of a fine boring hole. In the boring process of the engine cylinder hole, a push-pull boring bar is used to coaxially divide the fine boring and semi-finish boring, and cooperate with the servo compensation method to ensure the accuracy of the boring. Cylindricity technical requirements for cutting holes. Background technique [0002] The cylindricity requirement of the engine cylinder bore is relatively high, due to the uneven distribution of the radial wall thickness in the axial direction of the engine cylinder bore. The upper and lower ends of the axis of the hole are thicker, and the middle part is thinner. During the boring process, the tool retreats due to insufficient rigidity of the boring bar. The cylindricity of the hole is not high. The rigidity of the process system is increased, but limited by the technical conditions of the hole, it cannot completely solve...

AI Technical Summary

Problems solved by technology

In the general CNC system, manual compensation commands are set. The tool wear compensation is to set the compensation amount manually through the out-of-line inspection of the workpiece and the empirical judgment of the tool wear. This compensation will have obvious dimensions in a batch of processed holes. Inconsistency, although there is assembly interchangeability within the tolerance range, the assembly performance will vary due to the wear state of the tool, which directly affects the assembly accuracy of the machine

Images