Boring bar special for machining deep hole and inner groove

Abstract

The invention discloses a segmented type boring bar with a guide support part and special for machining a deep and long hole and an inner groove. The boring bar comprises the guide support part, a tool bit part, a feeding and retracting mechanism, a rod body part and a hydraulic drive part. The guide support part comprises a guide head and an auxiliary support part. The guide head is divided into a front guide head body and a rear guide head body which are connected through a screw. The rear guide head body is connected with the front end of a sleeve through a pin, a hydraulic cylinder is connected with the rear end of the sleeve through a pin, and a cutter bar is connected with the bottom of the hydraulic cylinder through a pin. When the inner groove is bored, the guide support part has a supporting effect, and the local static rigidity of the tool bit part can be improved. By means of the feeding and retracting mechanism, the axial positioning and the feeding and retracting movement of the tool can be achieved. The segmented type special tool with the guide support part is suitable for machining the multi-layer inner groove and can also be used for boring the inner wall of the deep and long hole; a blade is symmetrically arranged, so radial force and tangential force counteract, the rigidity of the cutter bar is greatly improved, and machining conditions are remarkably improved.

Description

technical field [0001] The invention belongs to the field of deep hole inner groove processing, in particular to a special boring bar for deep hole inner groove processing. Background technique [0002] In mechanical processing technology, deep hole internal groove boring is always a technical difficulty, because in the process of boring deep hole (length-to-diameter ratio greater than 15) internal groove, the boring tool is in a semi-closed state, and the structural size of the tool bar Restricted by the deep hole, it is generally a slender structure, and the rigidity of the boring bar is weak. Moreover, during the boring process, the tool bar is in an overhanging state. Without guide support, the deformation of the tool head is relatively large, which easily leads to the phenomenon of tool slipping, which seriously affects the machining accuracy of the deep hole inner groove. [0003] In order to solve the problem of stress deformation of boring bars with large length-to-...

AI Technical Summary

Problems solved by technology

However, the pressure knife spring is easy to be blocked by chips, which makes it impossible to retract the knife, and the reliability is poor. In addition, if you want to process multi-layer annular grooves, you must adjust the axial position of the bushing. The operation is cumbersome, and the gap between the annular grooves cannot be guaranteed Axial dimensional accuracy; and the corresponding guide and support mechanism is not added to the tool bar, so it is not suitable for machining deep-hole multi-layer annular inner grooves

[0008] It can be seen from the above that the existing deep hole inner groove processing technology has poor rigidity of the tool bar, poor flexibility in axial position control, and it is difficult to process multi-layer annular inner grooves, and the radial dimension of the tool bar is large, which is not suitable for small hole diameters. deep hole processing

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