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Method and tool for producing threaded hole

A threaded hole and tool technology, applied in the field of manufacturing threaded holes, can solve the problems of excessive cutting load of thread forming contour, broken cutting teeth, broken tool and so on.

Active Publication Date: 2019-01-04
AUDI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, this delay of the tapping process until drilling the threaded hole at a rotational speed of 0 leads to an excessive cutting load on the thread forming profile, which can lead to breakage of the cutting teeth or cause breakage of the tool

Method used

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  • Method and tool for producing threaded hole
  • Method and tool for producing threaded hole
  • Method and tool for producing threaded hole

Examples

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Embodiment Construction

[0033] exist figure 1 The completed threaded blind hole-hole 1 is shown in a and 1b. The hole 1 is machined into the workpiece 5 by means of so-called push drilling until the nominal hole depth t is reached through its hole bottom 3 B , later based on Figures 5 to 8 Explain push processing. Bore 1 has at its bore opening a circumferential threaded inset 7 , which merges downwards into an internal thread 9 in a subsequent extension. The internal thread 9 extends along the bore axis A to the available nominal thread depth t G . if available fromfigure 1 As obtained in , the thread 15 of the internal thread 9 leads into the surrounding groove 13 . The circumferential groove 13 has no pitch and is formed between the internal thread 9 and the bore bottom 3 as viewed in the axial direction. The thread thread 15 has a radially outer thread groove base 17 and a lateral thread flank 19 which merges radially inwardly into an inner thread crest 21 .

[0034] In addition, the thre...

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PUM

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Abstract

The invention relates to a method for producing a threaded hole (1) in a workpiece (5) by means of a thread tapping tool (23), which has at the tapping tip (25) thereof a main cutting edge (27) and athread profile (29), which lags in a thread tapping direction (I) and has at least one thread cutting tooth (41, 42, 43, 44), wherein, in a thread tapping stroke (G), the main cutting edge (27) produces a core hole and at the same time the thread profile (29) forms an internal screw thread (9) on the inner wall of the core hole until a target thread depth (tG) is achieved, specifically at a threadtapping advancement (fG) in the thread tapping direction (I) and a thread tapping rotational speed (nG) of the thread tapping tool (23) synchronized with said thread tapping advancement, wherein, after the thread tapping stroke (G), an opposite reversing stroke (R) is performed, in which the thread tapping tool (23) is removed from the threaded hole in a reversing direction (II), specifically with an opposite reversing advancement (fR). According to the invention, the thread profile (29) has at least one broaching cutting edge (46, 48, 50, 52). During the reversing stroke (H), a broached groove (R1 to R4) is produced by means of the broaching cutting edge (46, 48, 50, 52), through which broached groove the thread cutting tooth (41, 42, 43, 44) is removed from the threaded hole (1) in a stress-free manner.

Description

technical field [0001] The invention relates to a method for producing threaded holes, in particular threaded blind holes according to the preamble of claim 1 and a threaded hole drilling tool for carrying out such a method according to claim 17 / Tapping tool. Background technique [0002] Usually, when drilling threaded holes, a base hole / inner hole is produced in the workpiece in a first process step by means of a drill. [0003] Then, in a second process step, an internal thread is drilled into the pilot hole by means of a separate thread drill. Depending on size, thread drills have two or more cutting edges. The blades have teeth which remove chips of material from the inner wall of the bottom hole and possibly plastically deform the material to a lesser extent. The teeth of thread drills are configured in different ways, eg truncated to different degrees. In the cutting edge, each tooth thus carries away an almost equally large chip of material. [0004] In contras...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23G5/06B23G5/20B23D13/00
CPCB23D13/00B23G1/16B23G5/06B23G5/20
Inventor P·科普顿
Owner AUDI AG