A method for boring or machining grooves in a slender tube and the tool used

Abstract

The invention discloses a method and adopted tool for boring a hole or machining a groove in a slender tube. The method comprises the steps that a steel tube with the outer diameter slightly smaller than the inner diameter of the slender tube is adopted as a tool bar, and a rotating tool bit is arranged at the front end of the tool bar; before machining, the swinging angle beta of the tool bit is adjusted to be in the small included angle state, and the tool bit can smoothly enter the slender tube through a tube opening of the slender tube; during machining, the swinging angle beta of the tool bit is adjusted to be the cutting angle, then the tool bar is pulled from interior to exterior on the condition that the slender tube rotates, and the needed groove is cut in the inner wall of the slender tube through the tool bit. According to the improvement of the tool, the size maximization of the tool bar is achieved, deflection deformation and vibration of the tool bar in the machining process are reduced, and the machining precision of the groove in the slender tube is improved.

Description

technical field [0001] The invention relates to a method for machining a groove in a slender tube and a tool used, and belongs to the technical field of mechanical processing. Background technique [0002] In the processing of a large number of barrel (tube) parts, the stepped hole or groove in the hole is mostly processed by boring. However, some parts are very difficult to process when the ratio of length to aperture l / d>10. The boring bar is a cantilever beam from a mechanical point of view. It is difficult to guarantee the dimensional accuracy and roughness of boring holes when boring grooves in deep elongated holes, or machining multi-level stepped holes with large inside and small outside. Because when the depth of the boring hole is deep and the outer hole diameter is small, the usual boring bar is much smaller than the hole diameter, and the boring bar becomes a slender cantilever beam, which is obviously insufficient in rigidity, resulting in The first is that...

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Problems solved by technology

It is difficult to guarantee the dimensional accuracy and roughness of boring holes when boring grooves in deep elongated holes, or machining multi-level stepped holes with large inside and small outside.

Because when the depth of the boring hole is deep and the outer hole diameter is small, the usual boring bar is much smaller than the hole diameter, and the boring bar becomes a slender cantilever beam, which is obviously insufficient in rigidity, resulting in The first is that the size of the distal end of the hole will become smaller when the tool bar is deflected and boring, and it is difficult to ensure the dimensional accuracy; the second is that the tool bar is extremely easy to vibrate during cutting and it is difficult to ensure the roughness of the bored hole

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