A rotary screw sleeve for a fine-tuning boring unit

Abstract

The invention relates to a rotation threaded sleeve of a fine adjustment boring cutter unit. An annular boss is arranged on the outer circumferential face of the rotation threaded sleeve. Narrow grooves are formed in the outer cylindrical face of the annular boss in the radial direction, and the depth of the narrow grooves is larger than the radius of the part, at the position, of the outer cylindrical face. A clearance groove is formed in the rotation threaded sleeve and partitions an inner threaded hole in the rotation threaded sleeve into two sections. The narrow grooves are located in the clearance groove, the two narrow grooves are staggered in the axial direction, and the difference of the opening directions of the two narrow grooves is 180 degrees. The clearance groove is formed to divide the inner threaded hole in the rotation threaded sleeve into two sections, and meanwhile the two reverse narrow grooves staggered in the axial direction are cut out at the position of the clearance groove of the rotation threaded sleeve. By means of the fine adjustment boring cutter unit, under the action of a spring, fine deformation of the narrow grooves formed in the two positions happens so that two threaded sections originally continuous deform in the axial direction, a thread gap of a cutter rod thread and the rotation threaded sleeve is eliminated, and a cutter rod and the rotation threaded sleeve can relatively move without gaps.

Description

technical field [0001] The invention relates to a tool accessory for a machine tool, in particular to a rotary screw sleeve for a fine-tuning boring unit. Background technique [0002] The fine-tuning cutting unit is the core component of precision boring tools. In the existing popular technology, the cutting unit of the fine-tuning boring tool includes an outer sleeve, a tool bar, and a rotary screw sleeve arranged in the outer sleeve. Both ends of the rotary screw sleeve are Supported on springs; one end of the tool bar is threaded into the internally threaded hole of the swivel nut. By rotating the rotary screw sleeve in the counterclockwise direction, the cutter rod is driven to reciprocate along the axis of the outer sleeve. [0003] The internal thread of the rotary screw sleeve is a full thread. By cutting an axially dislocated and reversed narrow groove on the rotary screw sleeve, an external force is used to plastically deform the narrow groove before assembly, so ...

AI Technical Summary

Problems solved by technology

However, in practical application, it is very difficult to deform the narrow groove by external force so that the pitch reaches a reasonable amount of deformation; if the deformation is too small, the thread fit gap cannot be completely eliminated; can't assemble at all

And this kind of deformation must be completed before assembly, it is difficult to grasp the amount of deformation, and in the process of use after assembly, it is possible that the deformation of the narrow groove will recover, resulting in the failure of the thread to eliminate the clearance, or it may be due to the thread after a long period of non-use. The wear offsets the original effect of eliminating the thread gap by the deformation of the narrow groove, and produces a new thread working gap, which makes the thread transmission lose the transmission accuracy

Moreover, the narrow groove of the existing structure is opened at the thread of the rotary screw sleeve, and the thread deformation at the intersection of the thread and the narrow groove seriously affects the matching accuracy of the rotary screw sleeve and the tool holder

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