Method for machining overlong concentric ladder through hole on ordinary boring machine through lengthening boring cutter rod

Abstract

The invention relates to a method for machining an overlong concentric ladder through hole on an ordinary boring machine through a lengthening boring cutter rod. The method comprises the steps that 1, all parts of a workpiece are subjected to rough machining, and the periphery of the workpiece is subjected to finish machining; 2, the workpiece is subjected to alignment and clamping; 3, the lengthening boring cutter rod is composed of a taper shank section and a bare shaft section, the bare shaft section is provided with a plurality of boring cutter grooves in the longitudinal direction, and the shaft end of the bare shaft section is sleeved with a sliding sleeve; 4, a tailstock bracket is installed on the ordinary boring machine; 5, the lengthening boring cutter rod penetrates through the concentric ladder through hole, one end of the taper shank section is connected with a spindle of a machine tool, one end of the bare shaft section is installed on the tailstock bracket through the sliding sleeve, and the sliding sleeve and the tailstock bracket are tightly locked; a boring cutter body is installed, and try cutting is conducted; and 7, after try cutting is qualified, all the parts of the concentric ladder through hole are subjected to finish machining to reach the requirement of a drawing. According to the method for machining the overlong concentric ladder through hole on the ordinary boring machine through the lengthening boring cutter rod, existing machine tool auxiliaries are fully utilized, and the situation that the bore hole machining precision is influenced due to sinking of the lengthening boring cutter rod is avoided; and the effect that the size, the form and position tolerance and the surface roughness of the overlong concentric ladder through hole machined on the ordinary boring machine meet the requirements is ensured, so that the machining cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of boring, in particular to a method for machining super-long concentric stepped through-holes on a common boring machine by using an extended boring bar. Background technique [0002] When ordinary boring machines process holes on large special-shaped parts, for super-long concentric stepped through holes with a diameter greater than 200mm, it is generally processed by making an extended boring bar and boring from one side or from both sides. When adopting one-side boring processing method, due to the too long tool bar, the processing stroke is longer, and the tool bar is affected by the weight, vibration and machine tool precision after the tool bar is protruded. Large, and the roughness is out of tolerance; when using the boring method on both sides, it is very easy to produce out-of-tolerance coaxiality of the inner holes on both sides, and repeated clamping is required. Therefore, for products with hig...

AI Technical Summary

Problems solved by technology

When adopting one-side boring processing method, due to the too long tool bar, the processing stroke is longer, and the tool bar is affected by the weight, vibration and machine tool precision after the tool bar is protruded. Large, and the roughness is out of tolerance; when using the boring method on both sides, it is very easy to produce out-of-tolerance coaxiality of the inner holes on both sides, which requires repeated clamping

Therefore, for products with high design precision requirements, the commonly used boring method cannot guarantee the machining accuracy, and it is difficult to meet the user's requirements; at the same time, the machining process is long, and the alignment and clamping are complicated, resulting in increased processing costs.

[0003] Although processing with professional large-scale CNC boring and milling machines can guarantee the processing accuracy, when the processing enterprises have limited equipment capacity, they can only outsource the processing. Not only the processing cost is high, but also the transportation cost is high, and the construction period is difficult to guarantee.

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