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Deep hole drilling apparatus

A processing device and deep hole technology, applied in feeding devices, metal processing, automatic control devices, etc., can solve the problems of impossible drilling of deep holes, and achieve the effects of preventing diffusion, avoiding judgment deviation, and avoiding judgment errors

Inactive Publication Date: 2011-04-06
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tip of the resulting tool is thus longer, but sometimes wobbles radially, and the wobble makes it impossible to drill a precise deep hole

Method used

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Embodiment Construction

[0047]Details of the deep hole machining apparatus according to the present invention will be described below with reference to the accompanying drawings. Fig. 1 is a schematic diagram of a deep hole machining device according to an embodiment of the present invention. FIG. 2 is a graph showing the results of frequency analysis of acceleration. FIG. 3 is a graph showing the results of frequency analysis of acceleration when tool marks are generated. Fig. 4 is a graph showing temporal changes of the total value. FIG. 5 is a graph showing another method of setting a threshold. Fig. 6 is a schematic diagram of a deep hole machining device according to another embodiment of the present invention.

[0048] FIG. 1 shows a 5-axis BTA (Boring and Trepanning Association) machine tool, which is a deep hole drilling device for drilling a deep hole in a workpiece (object to be machined) W. The 5-axis BTA machine tool includes five drill rods 11 each having a hollow structure. Each dr...

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Abstract

A deep-hole drilling apparatus capable of preventing a tool mark from growing is provided. The deep-hole drilling apparatus provided for this purpose comprises: a tool (12) that is rotationally driven to drill a deep hole (Wa) in a work (W); an acceleration meter (19) that detects vibration of the tool (12) as the acceleration during deep hole processing; a monitoring apparatus (20) which performs frequency analysis on the acceleration detected by the acceleration meter (19) and which determines that a tool mark is produced in the deep hole (Wa) when the overall value of the whirling frequency and the bending natural frequency within a frequency range not including the torsional natural frequency on torsional vibration, constantly produced during the deep hole processing, exceeds a predetermined threshold (alpha); and an NC apparatus (18) that controls both revolution and feeding speed of the tool (12) on the basis of the determination made by the monitoring apparatus (20).

Description

technical field [0001] The present invention relates to a deep hole processing device capable of preventing tool marks from spreading. Background technique [0002] A common and commonly used method of drilling a hole in a workpiece (object to be machined) is as follows. A tool such as a drill is attached to a tool holding member such as a chuck, and the tool is then rotated to form the hole. The recent trend to manufacture a variety of compact products requires compact components for these products. Manufacture of compact components often requires drilling deep holes with small diameters in the component. Drilling must be precise. [0003] Drilling holes with a large hole depth / diameter ratio is known in particular as deep hole drilling. Conventionally known techniques for drilling deep holes include gun drilling systems and BTA (Boring and Trepanning Association) systems. The tool for deep hole drilling is formed with a small diameter and a long dimension correspondin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23B49/00B23B41/02B23Q15/12B23Q17/12G05B19/416
CPCB23B2260/1285G05B2219/45208B23B2250/16B23B41/02G05B2219/37233G05B2219/37434Y10T408/165Y10T408/17Y10T408/172B23B49/00B23Q15/12G05B19/416
Inventor 川下伦平广田和生加口仁霞流祥刚神户昭雄
Owner MITSUBISHI HEAVY IND LTD
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