GB2324752A - Tap tools - Google Patents

Tap tools Download PDF

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Publication number
GB2324752A
GB2324752A GB9808528A GB9808528A GB2324752A GB 2324752 A GB2324752 A GB 2324752A GB 9808528 A GB9808528 A GB 9808528A GB 9808528 A GB9808528 A GB 9808528A GB 2324752 A GB2324752 A GB 2324752A
Authority
GB
United Kingdom
Prior art keywords
tap tool
spigot
cylinder
thread
forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9808528A
Other versions
GB9808528D0 (en
GB2324752B (en
Inventor
Ernest Brian Davies
George Russell Govan
Nathan Charles Paxton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RICHARD LLOYD Ltd
Original Assignee
RICHARD LLOYD Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to GBGB9708596.3A priority Critical patent/GB9708596D0/en
Application filed by RICHARD LLOYD Ltd filed Critical RICHARD LLOYD Ltd
Publication of GB9808528D0 publication Critical patent/GB9808528D0/en
Publication of GB2324752A publication Critical patent/GB2324752A/en
Application granted granted Critical
Publication of GB2324752B publication Critical patent/GB2324752B/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23GTHREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G7/00Forming thread by means of tools similar both in form and in manner of use to thread-cutting tools, but without removing any material
    • B23G7/02Tools for this purpose
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2222/00Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23B2222/28Details of hard metal, i.e. cemented carbide

Abstract

A tap tool, for forming female threads in a workpiece, comprises a mounting shank 12 and a head 14 which has forming lobes and is made from carbide material. The head 14 is of composite form comprising a spigot on one end of the shank, which spigot is fixed concentrically in a socket within a cylinder or cap of the carbide material. The cylinder has a peripheral surface in which a forming thread 30 is formed.

Description

TAP TOOLS This invention concerns tap tools, for forming female threads in a workpiece, such as a nut or socket, of a kind comprising a mounting shank and a head in which the head has forming lobes made from carbide material.

A tool of said kind is disclosed in DE 39 34 621 Al in which thin strips of carbide material are secured in radially open grooves which extend longitudinally of the forming head, the strips being formed so as to provide thread segments aligned with a male thread formed on the head. These strips are vulnerable to damage at the front where the carbide is particularly thin.

Tap tools are also known which are made wholly of solid carbide material. It is known that carbide materials are very brittle and such tools are prone to break when subject to shock loads and misalignment which commonly arise during tapping. However, carbide material is also well known to be very expensive, and such expensiveness is a problem in itself.

In order to reduce the above problems the present invention provides a tap tool of the kind mentioned at the beginning hereof, which is characterised in that the head is of composite form comprising a spigot on one end of the shank, which spigot is fixed concentrically in a socket within a cylinder or cap of the carbide material, which cylinder has a peripheral surface in which a cutting thread is formed.

The radial thickness of the cylinder wall to the root of the thread is preferably greater than the maximum depth of the thread and is preferably less than the spigot diameter in order to maximise the torsional strength of the joint between the spigot and the socket.

The length of the socket is preferably greater than that of the spigot to leave a bonding material reception space between the ends thereof when the spigot is inserted fully into the socket.

An end face on the wall of the cylinder preferably confronts a shoulder formed on the shank, and may be bonded thereto by bonding material. Said end face is preferably chamfered.

The preferred bonding material is a brazing material.

A mechanical fixing between the spigot and the socket may also be used.

The thread is preferably ground so as to be lobed, and preferably, there are a small plurality of, e.g. three, four, five or more lobes per turn at equal angular intervals. Each lobe is preferably cam shaped to provide rising and descending flanks to an apex over an arc.

The invention will be described further, by way of example, with reference to the accompanying diagrammatic drawings, wherein FIGURE 1 shows a tap tool of the invention, in side elevation; FIGURE 2 shows a section on the line II-II in FIGURE 1; FIGURE 3 is a thread detail diagram of a conical lead of the tap tool; FIGURE 4 shows a shank of the tap tool in side elevation; and FIGURE 5 shows a carbide blank in longitudinal section prior to being mounted on the shank and ground to form the cutting head of said tap tool.

The tap tool 10 (FIGURE 1) comprises a shank 12 and a head 14 secured together by brazing material.

The shank has a driving square 20 (FIGURE 1) at one end, and a cylindrical spigot 22 (FIGURE 4) at the other end of a stem which terminates at a shoulder 23. The driving square 20 is of known form. The shank is made from steel a tough material such as HSS grade steel and is ground to size.

The forming head 14 comprises a cylinder or cap 40 of carbide material formed from a blank 40A (FIGURE 5) which provides an internal socket 41 having a mouth 42 at one end 45 of the cylinder, and provides a small co-axial centre hole 46 at the other end 44 of the cylinder. Said hole 46 is tapered at a cone angle A, and said end 45 is internally and externally chamfered, e.g. at about 45 , so that its face is tapered to produce a shoulder.

The socket 41 is axially longer than the spigot 22 so that when the spigot 22 is brazed into the cylinder 40, brazing material can flow into and be accommodated in the space 13 between the end 43 of the socket 41 and the end of the spigot. Excess brazing material or flux can escape back along the clearance between spigot and socket 41.

During brazing the tapered face of said end 45 may be brazed to the shoulder 23.

After brazing, excess flux or brazing material is cleaned off and a thread 30 is ground into the peripheral surface of the cylinder 40.

The thread 30 is ground as indicated in FIGURE 2 to provide, in this example, four lobes 31 per turn at 90" intervals so that the lobes are aligned in four rows extending longitudinally of the head. Each lobe has a rising flank 32, an apex 33 and a descending flank 34 and extends over an arc of about 20 . A conical lead is ground onto the first flow threads, e.g. 2 to 7, typically threads at a small angle B of typically about 7" to the axis as indicated in FIGURE 3.

The overall thread depth is less than the radial thickness of the wall of the cylinder as can be appreciatec from FIGURE 2, and said wall thicknesses is less than the diameter of the spigot.

The invention is not confined to details of thz foregoing example, and many variations and modifications, e.g. the number of lobes, the lead angle, the thread pitch and form, and relative thickness, may be made within th( scope of the invention.

The invention further includes a tool having an novel feature or novel combination of features disclose herein or in the drawings; and also includes a method ol making a tool as disclosed herein. The method may include any novel step or combination of steps disclosed herein.

Claims (9)

1. A tap tool, for forming female threads in a workpiece, comprising a mounting shank and a head which has forming lobes made from carbide material, and characterised in that the head is of composite forming comprising a spigot on one end of the shank, which spigot is fixed concentrically in a socket within a cylinder or cap of the carbide material, which cylinder has a peripheral surface in which a forming thread is formed.
2. A tap tool as claimed in Claim 1 wherein the radial thickness of the cylinder wall to the root of the thread is greater than the maximum depth of the thread and is less than the spigot diameter.
3. A tap tool as claimed in Claim 1 or 2 wherein the length of the socket is greater than that of the spigot to leave a bonding material reception space between the ends thereof when the spigot is inserted fully into the socket.
4. A tap tool as claimed in Claim 1,2 or 3 wherein an end face on the wall of the cylinder confronts a shoulder formed on the shank, and is bonded thereto by bonding material.
5. A tap tool as claimed in Claim 4 wherein said end face is chamfered.
6. A tap tool as claimed in any preceding claim wherein the bonding material is a brazing material.
7. A tap tool as claimed in any preceding claim wherein the thread is ground so as to be lobed, and there are a small plurality of lobes per turn at equal angular intervals.
8. A tap tool as claimed in Claim 7 wherein each lobe is cam shaped to provide rising and descending flanks to an apex over an arc.
9. A tap tool substantially as hereinbefore described with reference to the accompanying drawings.
GB9808528A 1997-04-29 1998-04-23 Tap tool Expired - Fee Related GB2324752B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GBGB9708596.3A GB9708596D0 (en) 1997-04-29 1997-04-29 Tap tools

Publications (3)

Publication Number Publication Date
GB9808528D0 GB9808528D0 (en) 1998-06-17
GB2324752A true GB2324752A (en) 1998-11-04
GB2324752B GB2324752B (en) 2001-12-05

Family

ID=10811485

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9708596.3A Pending GB9708596D0 (en) 1997-04-29 1997-04-29 Tap tools
GB9808528A Expired - Fee Related GB2324752B (en) 1997-04-29 1998-04-23 Tap tool

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9708596.3A Pending GB9708596D0 (en) 1997-04-29 1997-04-29 Tap tools

Country Status (1)

Country Link
GB (2) GB9708596D0 (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003011508A2 (en) * 2001-07-25 2003-02-13 Fette Gmbh Thread former or tap
WO2005014214A1 (en) * 2003-08-04 2005-02-17 Adcock Technology Limited A tap and a method of tapping
US7114891B2 (en) * 2001-05-22 2006-10-03 Sandvik Intellectual Property Ab Thread forming tool with annular ridge
WO2007073850A1 (en) * 2005-12-15 2007-07-05 Jel Precision Tools Gmbh & Co. Kg Tool for the chipless shaping of threads, in particular for the forming of internal threads
US7687156B2 (en) 2005-08-18 2010-03-30 Tdy Industries, Inc. Composite cutting inserts and methods of making the same
US8007922B2 (en) 2006-10-25 2011-08-30 Tdy Industries, Inc Articles having improved resistance to thermal cracking
US8025112B2 (en) 2008-08-22 2011-09-27 Tdy Industries, Inc. Earth-boring bits and other parts including cemented carbide
US8137816B2 (en) 2007-03-16 2012-03-20 Tdy Industries, Inc. Composite articles
US8221517B2 (en) 2008-06-02 2012-07-17 TDY Industries, LLC Cemented carbide—metallic alloy composites
US8272816B2 (en) 2009-05-12 2012-09-25 TDY Industries, LLC Composite cemented carbide rotary cutting tools and rotary cutting tool blanks
US8308096B2 (en) 2009-07-14 2012-11-13 TDY Industries, LLC Reinforced roll and method of making same
US8312941B2 (en) 2006-04-27 2012-11-20 TDY Industries, LLC Modular fixed cutter earth-boring bits, modular fixed cutter earth-boring bit bodies, and related methods
US8318063B2 (en) 2005-06-27 2012-11-27 TDY Industries, LLC Injection molding fabrication method
US8322465B2 (en) 2008-08-22 2012-12-04 TDY Industries, LLC Earth-boring bit parts including hybrid cemented carbides and methods of making the same
US8790439B2 (en) 2008-06-02 2014-07-29 Kennametal Inc. Composite sintered powder metal articles
US8800848B2 (en) 2011-08-31 2014-08-12 Kennametal Inc. Methods of forming wear resistant layers on metallic surfaces
US9016406B2 (en) 2011-09-22 2015-04-28 Kennametal Inc. Cutting inserts for earth-boring bits
DE10338754C5 (en) * 2003-08-23 2016-01-14 EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge Tool for non-cutting production of a thread and process for the production of a tool for non-cutting thread production
US9643236B2 (en) 2009-11-11 2017-05-09 Landis Solutions Llc Thread rolling die and method of making same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1209196A (en) * 1968-02-23 1970-10-21 Atsuo Hachiuma Tap

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1209196A (en) * 1968-02-23 1970-10-21 Atsuo Hachiuma Tap

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7114891B2 (en) * 2001-05-22 2006-10-03 Sandvik Intellectual Property Ab Thread forming tool with annular ridge
EP1409185B2 (en) 2001-07-25 2011-06-15 Fette GmbH Thread former or tap
WO2003011508A3 (en) * 2001-07-25 2003-09-18 Fette Gmbh Thread former or tap
US7112143B2 (en) 2001-07-25 2006-09-26 Fette Gmbh Thread former or tap
WO2003011508A2 (en) * 2001-07-25 2003-02-13 Fette Gmbh Thread former or tap
WO2005014214A1 (en) * 2003-08-04 2005-02-17 Adcock Technology Limited A tap and a method of tapping
US7575520B2 (en) 2003-08-04 2009-08-18 Adcock Technology Limited Tap and a method of tapping
DE10338754C5 (en) * 2003-08-23 2016-01-14 EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge Tool for non-cutting production of a thread and process for the production of a tool for non-cutting thread production
US8318063B2 (en) 2005-06-27 2012-11-27 TDY Industries, LLC Injection molding fabrication method
US8637127B2 (en) 2005-06-27 2014-01-28 Kennametal Inc. Composite article with coolant channels and tool fabrication method
US8808591B2 (en) 2005-06-27 2014-08-19 Kennametal Inc. Coextrusion fabrication method
US8647561B2 (en) 2005-08-18 2014-02-11 Kennametal Inc. Composite cutting inserts and methods of making the same
US7687156B2 (en) 2005-08-18 2010-03-30 Tdy Industries, Inc. Composite cutting inserts and methods of making the same
WO2007073850A1 (en) * 2005-12-15 2007-07-05 Jel Precision Tools Gmbh & Co. Kg Tool for the chipless shaping of threads, in particular for the forming of internal threads
US8789625B2 (en) 2006-04-27 2014-07-29 Kennametal Inc. Modular fixed cutter earth-boring bits, modular fixed cutter earth-boring bit bodies, and related methods
US8312941B2 (en) 2006-04-27 2012-11-20 TDY Industries, LLC Modular fixed cutter earth-boring bits, modular fixed cutter earth-boring bit bodies, and related methods
US8007922B2 (en) 2006-10-25 2011-08-30 Tdy Industries, Inc Articles having improved resistance to thermal cracking
US8841005B2 (en) 2006-10-25 2014-09-23 Kennametal Inc. Articles having improved resistance to thermal cracking
US8137816B2 (en) 2007-03-16 2012-03-20 Tdy Industries, Inc. Composite articles
US8221517B2 (en) 2008-06-02 2012-07-17 TDY Industries, LLC Cemented carbide—metallic alloy composites
US8790439B2 (en) 2008-06-02 2014-07-29 Kennametal Inc. Composite sintered powder metal articles
US8459380B2 (en) 2008-08-22 2013-06-11 TDY Industries, LLC Earth-boring bits and other parts including cemented carbide
US8225886B2 (en) 2008-08-22 2012-07-24 TDY Industries, LLC Earth-boring bits and other parts including cemented carbide
US8322465B2 (en) 2008-08-22 2012-12-04 TDY Industries, LLC Earth-boring bit parts including hybrid cemented carbides and methods of making the same
US8025112B2 (en) 2008-08-22 2011-09-27 Tdy Industries, Inc. Earth-boring bits and other parts including cemented carbide
US8858870B2 (en) 2008-08-22 2014-10-14 Kennametal Inc. Earth-boring bits and other parts including cemented carbide
US8272816B2 (en) 2009-05-12 2012-09-25 TDY Industries, LLC Composite cemented carbide rotary cutting tools and rotary cutting tool blanks
US9435010B2 (en) 2009-05-12 2016-09-06 Kennametal Inc. Composite cemented carbide rotary cutting tools and rotary cutting tool blanks
US8308096B2 (en) 2009-07-14 2012-11-13 TDY Industries, LLC Reinforced roll and method of making same
US9266171B2 (en) 2009-07-14 2016-02-23 Kennametal Inc. Grinding roll including wear resistant working surface
US9643236B2 (en) 2009-11-11 2017-05-09 Landis Solutions Llc Thread rolling die and method of making same
US8800848B2 (en) 2011-08-31 2014-08-12 Kennametal Inc. Methods of forming wear resistant layers on metallic surfaces
US9016406B2 (en) 2011-09-22 2015-04-28 Kennametal Inc. Cutting inserts for earth-boring bits

Also Published As

Publication number Publication date
GB9808528D0 (en) 1998-06-17
GB2324752B (en) 2001-12-05
GB9708596D0 (en) 1997-06-18

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20050423