Large-length-diameter-ratio guiding sectional boring rod

Abstract

The invention discloses a guiding sectional boring rod for boring deep hole inner grooves. The guiding sectional boring rod comprises a guiding part, a hydraulic driving part, a tool bit part, a hollow boring rod and a core rod. The guide part and the hollow boring rod are connected through a thread. The hollow boring rod and a plunger cylinder are connected through a thread, and are peripherally positioned by a positioning screw. The core rod is positioned in an inner hole of the hollow boring rod, and is connected with a plunger through a cylinder pin. In the boring process, the guiding part achieves a support effect to effectively improve local static rigidity of the tool bit part. The tool bit part includes two blades symmetrically distributed and capable of counteracting the radial force and the tangential force in boring to improve the stress condition of the tool bit. Compared with a boring rod in the prior art, the guiding sectional boring rod is higher in static rigidity, can bear higher cutting force, greatly improves the machining precision in deep hole inner groove boring and the machined surface quality, is also suitable for boring deep long holes, and is wider in machining range.

Description

technical field [0001] The invention belongs to the field of deep hole inner groove processing, in particular to a large-length-diameter-ratio band-guided segmented boring bar. Background technique [0002] In the existing field of mechanical processing, the boring bar is a main tool for machining grooves or holes in holes. However, in the boring process of the deep hole inner groove, because the boring tool is in a semi-closed state, the structural size of the boring bar is limited by the workpiece, the long-diameter ratio is large (L / D is greater than 15), the rigidity is relatively weak, and the boring During the process, the boring bar is in an overhanging state. If no corresponding guide or support is added, the force on the cutter head will cause large deformation, which will easily lead to the phenomenon of tool give-up and seriously affect the machining accuracy of the deep hole inner groove. [0003] In order to increase the rigidity of the boring bar, the current ...

AI Technical Summary

Problems solved by technology

However, the boring bar is not equipped with a reasonable chip removal structure, and the chips are easily blocked in the cutter head, seriously affecting the machined surface quality and tool life, and only a single boring cutter is installed at the cutter head, so the radial force and tangential force cannot be offset , the rigidity of the boring bar cannot be fully improved by relying only on the floating support; in addition, the boring bar drives the double-tapered mandrel to move axially by rotating the handle. Feeding and retracting, if the processing object is a multi-layer deep and long hole inner groove, the handle needs to be rotated repeatedly, the operation is cumbersome, and the processing accuracy cannot be guaranteed

[0005] Yang Hongli's paper titled "Multipurpose Reamer for Inner Hole Oil Groove" introduced a special reamer for machining inner hole grooves. The blades of the reamer are symmetrically arranged, so the cutting radial force and tangential force can cancel each other out, and the rigidity of the tool bar is improved to a certain extent, but the tool bar does not add corresponding guides or supports, and the tool is still overhanging during processing Therefore, it is not suitable for processing deep hole inner grooves with relatively large length and diameter, and the cutter bar lacks a reasonable chip removal structure, and the chips are easily blocked at the cutter head and the spring of the cutter

In addition, when using this tool bar to bore multi-layer annular grooves, the axial position of the bushing must be adjusted and adjusted. The operation is also cumbersome, and the axial dimensional accuracy between the annular grooves cannot be guaranteed.

[0006] It can be seen from the above that in the field of deep hole inner groove processing, the existing technology only includes one-sided inserts or lacks corresponding guide supports, which does not fully improve the rigidity of the boring bar, and the flexibility of axial position control is poor, and the operation is difficult. It is cumbersome, and the axial dimensional accuracy is difficult to guarantee

Moreover, most tool holders lack a reasonable chip removal structure, and chips are easily blocked at the processing position, which affects tool life and surface quality

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