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Tapping tool and method for producing threaded bore

A technology for tapping tools and threaded holes, used in toolholder accessories, thread cutting tools, tools for lathes, etc., can solve internal thread defects, material wear, weaken the fastening performance of screw elements screwed into internal threads, etc. question

Inactive Publication Date: 2020-12-04
AUDI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, material wear occurs on the flanks of the thread profile of the internal thread facing chips, which can lead to defects in the internal thread
Such defects in turn impair the fastening properties of screw elements screwed into internal threads

Method used

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  • Tapping tool and method for producing threaded bore
  • Tapping tool and method for producing threaded bore
  • Tapping tool and method for producing threaded bore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] exist figure 1 In , the completed threaded blind hole 1 is shown. The hole 1 is machined with its bottom 3 in the workpiece 5 by so-called lead-in drilling down to the nominal drilling depth t B , which will be referred to later Figure 5 to Figure 8 to explain. Bore 1 has at its opening a circumferential threaded countersink 7 , which turns into an internal thread 9 as it goes further downwards. The internal thread 9 extends along the bore axis A up to the available nominal thread depth t G . from figure 1 It can also be seen that the thread groove 15 of the internal thread 9 opens into the annular groove 13 with the thread end 11 . This annular groove 13 does not contain the thread lead and is formed between the internal thread 9 and the bore bottom 3 as viewed in the axial direction. The thread groove 15 has a radially outer thread root 17 and lateral upper and lower thread profile flanks 18 , 19 , which merge on the radially inner side into an inner thread cr...

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PUM

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Abstract

The invention relates to a tapping tool for producing a threaded bore (1) with internal thread (9) in a workpiece (5), wherein the tapping tool has, at the drill tip (25) thereof, a main cutting edge(27) and a thread profile (29) which trails in a tapping direction (I). The method involves a tapping stroke (G), in which the tapping tool (23) is driven with a tapping feed motion (fG) in the tapping direction (I), and with a tapping rotational speed (nG) synchronized therewith, into the workpiece (5), and the tool main cutting edge (27) produces a core hole and the tool thread profile (29) forms an internal thread (9) on the inner wall of the core hole. In the tapping stroke (G), chips (51) are produced which are conveyed out of the threaded bore (1) in a chip discharge direction which is opposite to the tapping direction (I), which chips collide with thread flanks (19) of the internal thread (9) which face toward the chips (51) for discharging. According to the invention, the tool thread profile (29) has at least one reversing tooth (57) by means of which, during the reversing stroke (R), a flank oversize (delta x) can be removed from those thread flanks (19) of the internal thread(9) to be produced which, during the tapping stroke (G), face toward the chips (51) for discharging.

Description

technical field [0001] The invention relates to a tapping / threading tool according to the preamble of claim 1 or 9 and a method for producing threaded holes, in particular threaded blind holes, according to claim 10 . Background technique [0002] In the so-called lead-in tapping method, core drilling and internal thread cutting are performed in the same tool stroke with a lead-in tapping tool. The threading tool has a main cutting edge at its drill point and a thread formation following in the tapping direction with at least one thread cutting tooth. In this method, a tapping stroke is made first, followed by a reverse stroke in the opposite direction. In the tapping stroke, on the one hand, the main cutting edge of the tool produces the core hole and, on the other hand, the thread forming part of the tool creates an internal thread on the inner wall of the core hole until the usable nominal thread depth is reached. For this purpose, the tapping tool is moved during the t...

Claims

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Application Information

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IPC IPC(8): B23G3/08B23G5/20
CPCB23B2228/28B23G3/08B23G5/20B23G2200/141B23G2200/142B23G2200/148B23G2200/18B23G2240/36B23G2200/143
Inventor P·科普顿
Owner AUDI AG