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Method and tool for producing threaded holes

A threaded hole and tool technology, applied in the field of manufacturing threaded holes, can solve the problems of cutting teeth breakage, tool breakage, excessive cutting load of the thread forming profile, etc.

Active Publication Date: 2020-01-14
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 holes
  • Method and tool for producing threaded holes
  • Method and tool for producing threaded holes

Examples

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Embodiment Construction

[0033] exist Figure 1a and 1b The completed threaded blind hole - hole 1 is shown in . 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. As can also be seen from FIG. 1 , the thread 15 of the internal thread 9 opens into a circumferential 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 threaded ...

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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) using a threaded hole drilling tool (23) having a main cutting edge (27) on its drill tip (25) and a The following thread forming profile (29) in the threaded hole drilling direction (I), the thread forming profile (29) has at least one thread cutting tooth (41, 42, 43, 44), wherein, during the threaded hole drilling stroke (G ), the main cutting edge (27) creates a bottom hole, while the thread forming profile (29) forms an internal thread (9) on the inner wall of the bottom hole until the rated thread depth (t G ), exactly the threaded hole feed rate (f G ) and the threaded hole drilling speed synchronous with this (n G ), where, after the threaded hole drilling stroke (G), an opposite reverse stroke (R) is performed, in which the threaded hole drilling tool (23) is moved from the threaded hole in the reverse direction (II) lead out, exactly with the opposite reverse feed (f R ). According to the invention, the thread forming contour (29) has at least one broaching edge (46, 48, 50, 52). During the reverse stroke (H), broaching grooves (R1 to R4) are created by means of broaching edges (46, 48, 50, 52) through which thread cutting teeth (41, 42, 43, 44) can pass Lead out of the threaded hole (1) without load.

Description

technical field [0001] The invention relates to a method for producing threaded holes, in particular threaded blind holes, and a threaded hole drilling / tapping tool for carrying out the method. 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 contrast to the above-described threading process, a method of the type is ...

Claims

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Application Information

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