Special cutter bar for boring inner annular grooves of deep-long holes

A special tool holder, deep and long hole technology, applied in boring bars and other directions, can solve the problems of poor axial dimensional accuracy, aggravated tool wear, large cutting force, etc., to reduce cylindricity error, improve local rigidity, and improve tool holder The effect of stiffness

Inactive Publication Date: 2016-06-29
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the radial dimension of this composite tool is large, and it cannot process deep and long holes with small diameters.
Moreover, the radial dimensions of the rough boring part and the rolling part are fixed, which can only be used for boring the inner wall of the deep hole, and cannot realize the boring processing of the annular inner groove of the multi-layer deep hole, and the processing object is relatively single
And the tool is not equipped with a corresponding chip removal structure, the chip is easy to scratch the machined surface, and it will also increase the tool wear and affect the tool life
[0005] Zhang Yanting of the Heavy Lathe Research Institute introduced a high-efficiency, high-precision grooving tool holder suitable for box hole processing in a paper titled "New Grooving Tool Holder Structure and Application". The oblique slider and the chute on the blade form a radial and reverse radial structure, which can reliably control the feeding and retracting of the tool, but the tool holder has only one blade, and the cutting radial force and tangential force cannot be offset, and there is no The corresponding guide support structure has poor rigidity of the cutter bar. In addition, if you want to process multi-layer annular grooves, you must rely on the adjustment nut to realize the axial position control. Chip structure, chips are easy to block in the cutter head, which seriously affects the machined surface

Method used

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  • Special cutter bar for boring inner annular grooves of deep-long holes
  • Special cutter bar for boring inner annular grooves of deep-long holes
  • Special cutter bar for boring inner annular grooves of deep-long holes

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[0041] Example

[0042] Such as figure 1 It is the longitudinal sectional structure diagram of the segmented deep hole annular inner groove boring special boring bar with guiding and double support of the present invention. It is mainly suitable for boring deep long holes with small diameters and deep long hole annular inner grooves. The length to diameter ratio of the boring bar is 17:1, and the main body diameter of the tool bar is 21mm. The boring bar is composed of a guide part, a tool head part, a tool advance and retreat control part, an axial positioning part, an auxiliary support part and a rod body part. The guiding part and the auxiliary supporting part provide support for the cutter head, reducing the force deformation at the cutter head. The rear core rod in the rod body part is made of a material with a high elastic modulus, which can further improve the overall rigidity of the cutter rod. The cutter head part is provided with three uniformly arranged blades, most ...

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Abstract

The invention discloses a special segmented boring bar with double guide support and used for boring machining for inner annular grooves of deep holes. The boring bar comprises a guide part, a cutter bit part, a cutter advancing-retreating control part, an axial location part, an auxiliary support part and a bar body part, wherein a guide head is connected with the front end of a sleeve by virtue of dowels, the auxiliary support part is connected with the sleeve by virtue of spherical screws, and due to the combination of the guide head and auxiliary support blocks, the partial static rigidity of the cutter bit can be greatly improved; a front baffle is connected with the front end of the guide head by virtue of a screw, and a rear baffle is connected with the rear end of the sleeve by virtue of a screw; and three uniformly-arranged blades are arranged in the peripheral direction of the cutter bit part, and capable of counteracting a radial force and a tangential force during cutting, and further improving the rigidity of the cutter bar. The special segmented boring bar with double guide support, which is disclosed by the invention, is applicable to boring machining for inner annular grooves of deep holes with large length-diameter ratios and multilayer deep holes; and compared with a boring bar in the prior art, the machining range is wider, and the machining surface quality and machining accuracy are remarkably improved.

Description

technical field [0001] The invention belongs to the field of deep hole inner groove processing, in particular to a special cutter bar for boring annular inner grooves of deep and long holes. Background technique [0002] In machining technology, deep hole annular inner groove is mainly realized by boring. However, in the process of boring the inner groove of the deep hole, the boring bar is in an overhanging state. Without guide support, the cutter head is not restrained, and the cutting force can easily deform the boring bar, and the structure of the tool bar The size is limited by the hole diameter of the workpiece, and the long-diameter ratio is relatively large (generally greater than 15), so the rigidity of the boring bar is weak, which is easy to cause the tool to give way, and the machining accuracy is difficult to guarantee. Moreover, in the process of deep hole boring, the cutting force is mostly uneven, the dynamic stiffness of the boring bar used for boring is po...

Claims

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Application Information

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IPC IPC(8): B23B29/02
CPCB23B29/02
Inventor 程寓付乾辰
Owner NANJING UNIV OF SCI & TECH
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