WO1992007678A1 - Apparatus and method for stripping and tapping cylinder heads for helicoils - Google Patents

Apparatus and method for stripping and tapping cylinder heads for helicoils Download PDF

Info

Publication number
WO1992007678A1
WO1992007678A1 PCT/AU1991/000501 AU9100501W WO9207678A1 WO 1992007678 A1 WO1992007678 A1 WO 1992007678A1 AU 9100501 W AU9100501 W AU 9100501W WO 9207678 A1 WO9207678 A1 WO 9207678A1
Authority
WO
WIPO (PCT)
Prior art keywords
threaded portion
air
tapping tool
shank
spark plug
Prior art date
Application number
PCT/AU1991/000501
Other languages
French (fr)
Inventor
Thomas John Ryan
Original Assignee
Thomas John Ryan
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
Application filed by Thomas John Ryan filed Critical Thomas John Ryan
Publication of WO1992007678A1 publication Critical patent/WO1992007678A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G5/00—Thread-cutting tools; Die-heads
    • B23G5/02—Thread-cutting tools; Die-heads without means for adjustment
    • B23G5/06—Taps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0042—Devices for removing chips
    • B23Q11/005—Devices for removing chips by blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G2240/00—Details of equipment for threading other than threading tools, details of the threading process
    • B23G2240/56—Producing or refurbishing threads for spark plugs or glow plugs

Definitions

  • the present invention relates to an improved tapping device and in particular to a method and apparatus for stripping and tapping of aluminium cylinder heads for helicoils.
  • the threaded bore of the spark plug hole can be damaged and require that the spark plug hole be recoiled.
  • the thread could require replacing as a result of:
  • taps such as those shown in Australian Patent Application No. 15472/88.
  • the cutting die is formed on longitudinal lands having recesses therebetween with a bore extending down the centre of the tap with outlets located adjacent the free cutting end of the tap.
  • Lubricants, coolant or air can be introduced into the bore.
  • this type of tap is mainly suitable for blind holes, as the lubricant and air would, when used on the final cut in a spark plug hole, blow the swarf into the cylinder.
  • the present invention seeks to provide an apparatus which allows the spark plug hole to be recoiled while avoiding the above disadvantages.
  • the present invention comprises a tapping tool comprising: a shank at one end; a threaded portion at or adjacent the other end; a cutting die, of larger diameter than that of the threaded portion, formed on longitudinally extending lands, located intermediately the said two ends with respective longitudinally extending recesses located between adjacent lands; an air passageway extending from said shank terminating in outlets located at or adjacent the threaded portion and orientated as to direct air from said threaded portion along said recesses towards said shank, such that, in use, said threaded portion is of the same diameter and thread pitch to that of the hole being tapped, with the air blowing the swarf out of the hole in the direction of the shank.
  • FIG. 1 illustrates one embodiment of a threaded stripping tool to be used in the method of the present invention
  • FIG. 2 illustrates one embodiment of a tapping tool according to one embodiment of the present invention
  • FIG. 3 illustrates schematically the tapping tool of Figure 2 in use
  • FIG. 4 illustrates a second embodiment of a tapping tool according to the present invention
  • FIG. 5 illustrates schematically the tapping tool of Figure 3 in use.
  • This tool 1 comprises a threaded shank 2, a threaded portion 3, various spacer elements 4, and drive rings 5 and 6.
  • the threads of the threaded shank 2 being much finer than the threads of the threaded portion 3.
  • the free end of the tool is, with the appropriate number of spacer elements 4 in position, inserted into the spark plug hole, such that the threaded portion 3 engages in the threads of the spark plug hole with the end spacer 4 abutting the outside of the spark plug hole.
  • the nut 7 is tightened bearing on the drive rings 5 and 6 drawing the threaded shank 2 and hence
  • the spacer rings 6 are gradually removed and the above mentioned steps are repeated until all of the damaged thread of the spark plug hole is removed. This gradual removal ensures that no material falls into the cylinder.
  • the tool 10 as shown in Figure 2 is then used. This tool has a free end having a diameter almost exactly that of the thus stripped spark plug hole, with a following threaded portion 9 of a thread diameter only marginally larger than the diameter of thus stripped spark plug hole.
  • the tool 10 is inserted into the spark plug hole 16, as shown in Figure 3, wherein the threaded portion 9 deforms the material of the hole to "bruise" a thread.
  • the cutting die 11 Following the threaded portion 9 is the cutting die 11, which is formed as a plurality of lands 12.
  • An air source (not shown) is attached to the end 13 by any suitable means, such that the tapping tool 10 is free to be rotated to cut the thread.
  • a final tapping tool 17 an example of one embodiment is shown in Figure 4, is then used.
  • This tool 17 comprises a threaded portion 18 of the same diameter and pitch as t h at of ' the hole tapped by the tool 10, followed by the cutting die 19, located on lands 20.
  • Air passageway 21 is located so as not to interfere with the operation of the cutting die 19, and have outlets located facing back up the valley 22.
  • SUBSTITUTE SHEET 4 - is blown back up the valleys 22, without any swarf falling into the cylinder 23.
  • the tool 17 is then removed while maintaining the air and the coil inserted to receive the spark plug.
  • the particular shape of the airway passages can be of any configuration, either external as shown in Figure 4, or internal as shown in Figure 2.

Abstract

In internal combustion motors the threaded bore of the spark plug hole can be damaged and require the recoiling of the spark plug hole. The invention provides an improved tapping tool (10) which comprises a threaded portion (9) adjacent or at one end. In use the threaded portion (9) engages in the spark plug hole to hold the tapping tool central with respect to the spark plug hole. Following the threaded portion (9) is a cutting die (11) which comprises a plurality of lands (12), with valleys (15) located therebetween. Air is supplied through the tool which directs a stream of air from the threaded portion (9) back along the valleys (15) to blow the swarf clear of the spark plug hole.

Description

APPARATUS AND METHOD FOR STRIPPING AND TAPPING CYLINDER HEADS FOR HELICOILS
The present invention relates to an improved tapping device and in particular to a method and apparatus for stripping and tapping of aluminium cylinder heads for helicoils.
In existing internal combusion motors, the threaded bore of the spark plug hole can be damaged and require that the spark plug hole be recoiled. The thread could require replacing as a result of:
1. hard carbon build up on end of the spark plug sometimes cause, removal of spark plug, to tear out the thread;
2. short reach plugs have been fitted instead of long reach plugs, causing the thread to strip;
3. or the plug is left loose over a period of time.
With existing recoiling techniques it is required to remove the cylinder head to ensure no swarf falls into the combustion cylinder and foul the piston rings.
It is known to have taps, such as those shown in Australian Patent Application No. 15472/88. The cutting die is formed on longitudinal lands having recesses therebetween with a bore extending down the centre of the tap with outlets located adjacent the free cutting end of the tap. Lubricants, coolant or air can be introduced into the bore. However this type of tap is mainly suitable for blind holes, as the lubricant and air would, when used on the final cut in a spark plug hole, blow the swarf into the cylinder.
The present invention seeks to provide an apparatus which allows the spark plug hole to be recoiled while avoiding the above disadvantages.
In one broad form the present invention comprises a tapping tool comprising: a shank at one end; a threaded portion at or adjacent the other end; a cutting die, of larger diameter than that of the threaded portion, formed on longitudinally extending lands, located intermediately the said two ends with respective longitudinally extending recesses located between adjacent lands; an air passageway extending from said shank terminating in outlets located at or adjacent the threaded portion and orientated as to direct air from said threaded portion along said recesses towards said shank, such that, in use, said threaded portion is of the same diameter and thread pitch to that of the hole being tapped, with the air blowing the swarf out of the hole in the direction of the shank. The invention will now be described with reference to the accompanying drawings in which:
FIG. 1 illustrates one embodiment of a threaded stripping tool to be used in the method of the present invention;
FIG. 2 illustrates one embodiment of a tapping tool according to one embodiment of the present invention:
FIG. 3 illustrates schematically the tapping tool of Figure 2 in use,
FIG. 4 illustrates a second embodiment of a tapping tool according to the present invention, and
FIG. 5 illustrates schematically the tapping tool of Figure 3 in use.
When it is necessary to recoil a spark plug hole in the cylinder head of a motor, due to the partial stripping of the thread, the spark plug is removed, and the tool 1 as shown in Figure 1 is used.
This tool 1 comprises a threaded shank 2, a threaded portion 3, various spacer elements 4, and drive rings 5 and 6. The threads of the threaded shank 2 being much finer than the threads of the threaded portion 3. The free end of the tool is, with the appropriate number of spacer elements 4 in position, inserted into the spark plug hole, such that the threaded portion 3 engages in the threads of the spark plug hole with the end spacer 4 abutting the outside of the spark plug hole. The nut 7 is tightened bearing on the drive rings 5 and 6 drawing the threaded shank 2 and hence
SUBSTITUTE SHEET the threaded portion 3 through the spacer elements 4, and drive rings 5 and 6, stripping the thread from the spark plug hole. The spacer rings 6 are gradually removed and the above mentioned steps are repeated until all of the damaged thread of the spark plug hole is removed. This gradual removal ensures that no material falls into the cylinder. The tool 10 as shown in Figure 2 is then used. This tool has a free end having a diameter almost exactly that of the thus stripped spark plug hole, with a following threaded portion 9 of a thread diameter only marginally larger than the diameter of thus stripped spark plug hole. The tool 10 is inserted into the spark plug hole 16, as shown in Figure 3, wherein the threaded portion 9 deforms the material of the hole to "bruise" a thread.
Following the threaded portion 9 is the cutting die 11, which is formed as a plurality of lands 12. An air source (not shown) is attached to the end 13 by any suitable means, such that the tapping tool 10 is free to be rotated to cut the thread.
As shown in Figure 3 air passes down the axial passageway 14 and is directed back up the valleys 15 to blow the swarf clear of the spark plug hole 16. When the new thread has been cut, the tool 10 is withdrawn, with air maintained.
A final tapping tool 17, an example of one embodiment is shown in Figure 4, is then used. This tool 17 comprises a threaded portion 18 of the same diameter and pitch as that of' the hole tapped by the tool 10, followed by the cutting die 19, located on lands 20.
Air passageway 21 is located so as not to interfere with the operation of the cutting die 19, and have outlets located facing back up the valley 22.
As shown in Figure 5 the threaded portion 18 engages in the threads of the spark plug hole 16 holding the tool 17 firmly in the hole 16. The tool 17 is then rotated cutting the new thread.
Because of the direction of the outlets of the air passageways, even the swarf of the final (breakthrough) cut
SUBSTITUTE SHEET 4 - is blown back up the valleys 22, without any swarf falling into the cylinder 23.
The tool 17 is then removed while maintaining the air and the coil inserted to receive the spark plug.
The particular shape of the airway passages can be of any configuration, either external as shown in Figure 4, or internal as shown in Figure 2.
It should be obvious to people skilled in the art that modifications and variations can be made to the above described embodiments without departing from the scope or spirit of the present invention.
SUBSTITUTE SHEET j

Claims

- 5 -C l a i ms :
1. In one broad form the present invention comprises a tapping tool comprising: a shank at one end; a threaded portion at or adjacent the other end; a cutting die, of larger diameter than that of the threaded portion, formed on longitudinally extending lands, located intermediately the said two ends with respective longitudinally extending recesses located between adjacent lands; an air passageway extending from said shank terminating in outlets located at or adjacent the threaded portion and orientated as to direct air from said threaded portion along said recesses towards said shank, such that, in use, said threaded portion is of the same diameter and thread pitch to that of the hole being tapped, with the air blowing the swarf out of the hole in the direction of the shank.
2. A tapping tool according to claim 1 wherein said air passageway comprises a central bore supplying air to airways, located in said threaded portion, which airways surround said central bore.
3. A tapping tool according to claim 2 wherein said air passageway comprises a plurality of hollow tubes each of which run along a respective longitudinally extending recess against the side walls of the longitudinally extending lands, and bend back on itself in a recess in the threaded portion to direct air back along the longitudinal recess.
4. A tapping tool according to claim 1 or 2 wherein air is connected by means of a rotatable connection to the shank of the tapping tool.
5. A tapping tool as hereinbefore described with reference to any one Figures 2 to 5.
PCT/AU1991/000501 1990-10-29 1991-10-29 Apparatus and method for stripping and tapping cylinder heads for helicoils WO1992007678A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPK3043 1990-10-29
AUPK304390 1990-10-29
AUPK6280 1991-05-22
AUPK628091 1991-05-22

Publications (1)

Publication Number Publication Date
WO1992007678A1 true WO1992007678A1 (en) 1992-05-14

Family

ID=25643961

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1991/000501 WO1992007678A1 (en) 1990-10-29 1991-10-29 Apparatus and method for stripping and tapping cylinder heads for helicoils

Country Status (1)

Country Link
WO (1) WO1992007678A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5661028A (en) * 1995-09-29 1997-08-26 Lockheed Martin Energy Systems, Inc. Large scale DNA microsequencing device
US5842924A (en) * 1997-02-25 1998-12-01 Manos; Mark R. Thread repairing tool
US7073988B2 (en) * 2002-10-08 2006-07-11 Sandvik Intellectual Property Ab Threaded tool with coolant supply

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU647071A1 (en) * 1974-05-06 1979-02-15 Предприятие П/Я Г-4781 Tap die
DE3307555A1 (en) * 1983-03-03 1984-09-13 Gühring, Gottlieb, 7470 Albstadt Bore-finishing tool
JPS61136726A (en) * 1984-12-04 1986-06-24 Hitachi Zosen Corp Tap
JPS61136725A (en) * 1984-12-04 1986-06-24 Hitachi Zosen Corp Tapping work and apparatus thereof
US4762444A (en) * 1987-03-16 1988-08-09 Mena Carl M Screw tap with lubrication and extraction bores
JPS63306820A (en) * 1987-01-29 1988-12-14 Nachi Fujikoshi Corp Tap provided with oil hole
JPH02100820A (en) * 1988-06-20 1990-04-12 Nachi Fujikoshi Corp Rolled tap with oil hole
JPH02180524A (en) * 1988-12-28 1990-07-13 Musashi Seimitsu Ind Co Ltd Tap

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU647071A1 (en) * 1974-05-06 1979-02-15 Предприятие П/Я Г-4781 Tap die
DE3307555A1 (en) * 1983-03-03 1984-09-13 Gühring, Gottlieb, 7470 Albstadt Bore-finishing tool
JPS61136726A (en) * 1984-12-04 1986-06-24 Hitachi Zosen Corp Tap
JPS61136725A (en) * 1984-12-04 1986-06-24 Hitachi Zosen Corp Tapping work and apparatus thereof
JPS63306820A (en) * 1987-01-29 1988-12-14 Nachi Fujikoshi Corp Tap provided with oil hole
US4762444A (en) * 1987-03-16 1988-08-09 Mena Carl M Screw tap with lubrication and extraction bores
JPH02100820A (en) * 1988-06-20 1990-04-12 Nachi Fujikoshi Corp Rolled tap with oil hole
JPH02180524A (en) * 1988-12-28 1990-07-13 Musashi Seimitsu Ind Co Ltd Tap

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
DERWENT ABSTRACT, Accession No. K5400B/45, Class P54, Class P56; & SU,A,647 071 (KUZIN), 15 February 1979 (15.02.79). *
PATENT ABSTRACTS OF JAPAN, M-1031, page 53; & JP,A,2 180 524 (MUSASHI SEIMITSU IND CO LTD), 13 July 1990 (13.07.90). *
PATENT ABSTRACTS OF JAPAN, M-534, page 4; & JP,A,61 136 725 (MITSUBISHI HEAVY IND LTD), 24 June 1986 (24.06.86). *
PATENT ABSTRACTS OF JAPAN, M-534, page 4; & JP,A,61 136 726 (HITACHI ZOSEN CORP), 24 June 1986 (24.06.86). *
PATENT ABSTRACTS OF JAPAN, M-811, page 67; & JP,A,63 306 820 (NACHI FUJIKOSHI CORP), 14 December 1988 (14.12.88). *
PATENT ABSTRACTS OF JAPAN, M-993, page 43; & JP,A,2 100 820 (NACHI FUJIKOSHI CORP), 12 April 1990 (12.04.90) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5661028A (en) * 1995-09-29 1997-08-26 Lockheed Martin Energy Systems, Inc. Large scale DNA microsequencing device
US5944971A (en) * 1995-09-29 1999-08-31 Lockheed Martin Energy Research Corporation Large scale DNA microsequencing device
US5842924A (en) * 1997-02-25 1998-12-01 Manos; Mark R. Thread repairing tool
US7073988B2 (en) * 2002-10-08 2006-07-11 Sandvik Intellectual Property Ab Threaded tool with coolant supply

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