CA1224328A - Manufacture of rotatable ignition files or flint wheels - Google Patents
Manufacture of rotatable ignition files or flint wheelsInfo
- Publication number
- CA1224328A CA1224328A CA000446952A CA446952A CA1224328A CA 1224328 A CA1224328 A CA 1224328A CA 000446952 A CA000446952 A CA 000446952A CA 446952 A CA446952 A CA 446952A CA 1224328 A CA1224328 A CA 1224328A
- Authority
- CA
- Canada
- Prior art keywords
- blank
- blanks
- punch
- peripheral edge
- axial
- 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.)
- Expired
Links
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- Forging (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to a method of manufacturing rotatable ignition files or flint wheels such as those found in lighters. The method comprises cutting elongate wire stock of the desired gauge in blanks and applying a series of press operations to the blanks using punches and dies to champfer the peripheral edges of the blanks. This provides axial mounting holes and hardens the respective surfaces of the blanks. This method results in less wastage of material and provides more uniform blanks.
The outer hardened layer on the wheel has better hardness properties, tensile strength and yield point and an improved wear resistance when compared to those of the prior art.
This invention relates to a method of manufacturing rotatable ignition files or flint wheels such as those found in lighters. The method comprises cutting elongate wire stock of the desired gauge in blanks and applying a series of press operations to the blanks using punches and dies to champfer the peripheral edges of the blanks. This provides axial mounting holes and hardens the respective surfaces of the blanks. This method results in less wastage of material and provides more uniform blanks.
The outer hardened layer on the wheel has better hardness properties, tensile strength and yield point and an improved wear resistance when compared to those of the prior art.
Description
1 ~his invention is concerned with the manufacture of rotatable ignition files or f:Lint wheels, for e~ample for lightexs.
In accordance with -the present invention, I pro-vide a method of manufacturiny rotatable ignition filesor flint wheels, for example for lighters, comprising the steps of: cutting elongate wire stock of gauge appro-priate to the desired diameter of the wheel into blanks of suitable size; and applying a series of press operations to the blanks by means of respecti~e punches and dies to champfer or round off the peripheral edges of the blanks, to provide axial mounting holes, and to harden the respective surfaces of the blanks; and the circumferential surfaces of the respective blanks being formed as friction surfaces.
Preferably the series of press operations com-prise the following steps in order: guiding the cut blank into a die hole and applying pressure thereto by a pair of opposed punches to initially shape the blank; champfering or rounding off the peripheral edge of the blank at one axial end surface thereof by charging the shaped blank into a second die hole having a bottom formed with a rounded peripheral edge and applying pressure to the blank by means of a co-operating punch; thereafter champfering or rounding off the peripheral edge of the blank at its other axial surface and simultaneously providing a central recess in each axial end surface of the blank by inverting the blank and charging it into a die hole having a bottom - 1 - J~
1 wi-th a rounded peripheral edge and a small diameter guide channel for a small dia~e-ter punch opening in the centre of the said bottom, and applying pressure to the inverted blank in the bo-ttom of the said die hole between a co-operating punch formed with a forward end protrusion on its axial centre line and the said small diameter punch; and thereafter forming a through aperture along the axial centre line of -the blank by means of a punch die.
It should be appreciated that the above sequence of steps is merely -that which we prefer and alternative steps are feasible, as are additional steps, as desired.
The invention is hereina~ter more particularly described by way of example only with reference to the accompanying drawings, in which:-Fig. 1 is a perspective view of a raw cut blank;
Fig. 2 is a sectional view illustrating the step of initially shaping the blank;
Fig. 3 is a sectional view through the initially shaped blank;
Fig. 4 is a sectional view illustrating a subsequent stage of champfering or rounding off one peripheral edge of the blank;
Fig. 5 shows the blank in sec-tion after appli-cation of the step illustrated in Fig. 4;
Fig. 6 illustrates a subsequent step of champfering or rounding off the other peripheral edge surEace and ~orming recesses in -the opposite axial faces of the blank;
Fig. 7 shows the blank a-t the end of -the operation illustrated in Fig. 6;
Fig. 8 illustra-tes a yet subsequent stage in which an axial hole is punched through the blank;
Fig. 9 shows in section the blank at the end of the operation illustrated in Fig. 8;
Fig. 10 shows two alternative embodiments of blank at the end of the operation illustrated in Fig. 8, the blanks being shown in section taken along the line A-A
in Fig. 9;
Fig. 11 shows a perspective view of the finished rotatable ignition file or flint wheel; and Fig. 12 shows the wheel of Fiy. 11 in section.
Elongate wire stock ~such as iron wire~ of gauge appropriate to the desired diameter of the finished wheel is first cut into blanks 1 of suitable size. The blank 1 is charged into hole 4a of a die 3a having a pair of co-operating punches 2a,2a for applying pressure to the blank 1 to give it an initial shape suitable for subsequent working. As will be seen from Fig. 3, the initial shape has respective recesses la in each axial end surface.
The thus initially shaped blank is charged into a second die having a die hole 4_, and pressure is applied to the blank by means of a co-operating punch 2_. The bottom surface 4b' has a champfered or rounded peripheral 1 edge so -that after -the opera-tion illustrated in Fig. 4 when -the blanl~ 1 is pushed out oE -the die by means of a pin 5, it has -the configuration shown in Fig. 5, from which figure it will be seen that -the blank has a rounded or champfered peripheral edge lb.
The blank is then inverted and charged into the die hole 4c of a further die also formed with a champfered or rounded peripheral edge to its bottom surface 4c'. In this case, an aperture of relatively small diameter in which is received a punch 2c' of relatively small diameter opens into the centre of bottom surface 4c'. The punch 2c also has an axial protrusion in its end surface.
Pressure is applied to the blank 1 in the bottom of the die hole 4c between the main punch 2c and the small diameter punch 2c' so that the second axial end surface of the blank is formed with a champfered or rounded periphery at lb' and respective recesses lc are formed in the centre of the respective axial end surfaces (Fig. 7).
The blank 1 is next charged into the die hole 4d of a conventional punch die 3d and a round, or alternatively square, cross-sectioned hole ld is punched through the blank at the position of the recesses lc by means of co-operating hole making punches 2d,2d.
The blank 1 may then be quenched and a friction surface is formed at the periphery of the wheel, for example by forming file cuts le, to complete formation of the wheel.
1 ~s will be apprecia-ted from the foregoing description, the series oE co-operating punches and dies 2a,3a, 2b,3b; 2c,3c; and 2d,3d may be operated by relatively unskilled personnel. The presently described method avoids -the need for skilled cutting of blanks, avoids the need for skilled cutting of the peripheral edges of the blanks by means of champfering tooling, which avoids the creation of cut chips of the material, and avoids any need to drill the so-formed champfered blanks.
We have found that there is less wastage of material by employing the series of punch operations as described hereinabove than there would be in seeking to perform similar operations by cutting tools. Moreover, even with relatively unskilled personnel, the resultant blanks prior to the cutting operation are relatively more uniform so that the file cuts le can be more readily formed and there is less likelihood of sharp edges to those cuts being created which would tend to lacerate the finger of the user of a lighter.
The series of punch operations further has the effect of forming an outer hardened layer lf (see Fig. 12) on the wheel having better hardness properties, tensile strength and yield point and a wear resistance which may be two to three times more than for flint wheels formed by other processes.
In accordance with -the present invention, I pro-vide a method of manufacturiny rotatable ignition filesor flint wheels, for example for lighters, comprising the steps of: cutting elongate wire stock of gauge appro-priate to the desired diameter of the wheel into blanks of suitable size; and applying a series of press operations to the blanks by means of respecti~e punches and dies to champfer or round off the peripheral edges of the blanks, to provide axial mounting holes, and to harden the respective surfaces of the blanks; and the circumferential surfaces of the respective blanks being formed as friction surfaces.
Preferably the series of press operations com-prise the following steps in order: guiding the cut blank into a die hole and applying pressure thereto by a pair of opposed punches to initially shape the blank; champfering or rounding off the peripheral edge of the blank at one axial end surface thereof by charging the shaped blank into a second die hole having a bottom formed with a rounded peripheral edge and applying pressure to the blank by means of a co-operating punch; thereafter champfering or rounding off the peripheral edge of the blank at its other axial surface and simultaneously providing a central recess in each axial end surface of the blank by inverting the blank and charging it into a die hole having a bottom - 1 - J~
1 wi-th a rounded peripheral edge and a small diameter guide channel for a small dia~e-ter punch opening in the centre of the said bottom, and applying pressure to the inverted blank in the bo-ttom of the said die hole between a co-operating punch formed with a forward end protrusion on its axial centre line and the said small diameter punch; and thereafter forming a through aperture along the axial centre line of -the blank by means of a punch die.
It should be appreciated that the above sequence of steps is merely -that which we prefer and alternative steps are feasible, as are additional steps, as desired.
The invention is hereina~ter more particularly described by way of example only with reference to the accompanying drawings, in which:-Fig. 1 is a perspective view of a raw cut blank;
Fig. 2 is a sectional view illustrating the step of initially shaping the blank;
Fig. 3 is a sectional view through the initially shaped blank;
Fig. 4 is a sectional view illustrating a subsequent stage of champfering or rounding off one peripheral edge of the blank;
Fig. 5 shows the blank in sec-tion after appli-cation of the step illustrated in Fig. 4;
Fig. 6 illustrates a subsequent step of champfering or rounding off the other peripheral edge surEace and ~orming recesses in -the opposite axial faces of the blank;
Fig. 7 shows the blank a-t the end of -the operation illustrated in Fig. 6;
Fig. 8 illustra-tes a yet subsequent stage in which an axial hole is punched through the blank;
Fig. 9 shows in section the blank at the end of the operation illustrated in Fig. 8;
Fig. 10 shows two alternative embodiments of blank at the end of the operation illustrated in Fig. 8, the blanks being shown in section taken along the line A-A
in Fig. 9;
Fig. 11 shows a perspective view of the finished rotatable ignition file or flint wheel; and Fig. 12 shows the wheel of Fiy. 11 in section.
Elongate wire stock ~such as iron wire~ of gauge appropriate to the desired diameter of the finished wheel is first cut into blanks 1 of suitable size. The blank 1 is charged into hole 4a of a die 3a having a pair of co-operating punches 2a,2a for applying pressure to the blank 1 to give it an initial shape suitable for subsequent working. As will be seen from Fig. 3, the initial shape has respective recesses la in each axial end surface.
The thus initially shaped blank is charged into a second die having a die hole 4_, and pressure is applied to the blank by means of a co-operating punch 2_. The bottom surface 4b' has a champfered or rounded peripheral 1 edge so -that after -the opera-tion illustrated in Fig. 4 when -the blanl~ 1 is pushed out oE -the die by means of a pin 5, it has -the configuration shown in Fig. 5, from which figure it will be seen that -the blank has a rounded or champfered peripheral edge lb.
The blank is then inverted and charged into the die hole 4c of a further die also formed with a champfered or rounded peripheral edge to its bottom surface 4c'. In this case, an aperture of relatively small diameter in which is received a punch 2c' of relatively small diameter opens into the centre of bottom surface 4c'. The punch 2c also has an axial protrusion in its end surface.
Pressure is applied to the blank 1 in the bottom of the die hole 4c between the main punch 2c and the small diameter punch 2c' so that the second axial end surface of the blank is formed with a champfered or rounded periphery at lb' and respective recesses lc are formed in the centre of the respective axial end surfaces (Fig. 7).
The blank 1 is next charged into the die hole 4d of a conventional punch die 3d and a round, or alternatively square, cross-sectioned hole ld is punched through the blank at the position of the recesses lc by means of co-operating hole making punches 2d,2d.
The blank 1 may then be quenched and a friction surface is formed at the periphery of the wheel, for example by forming file cuts le, to complete formation of the wheel.
1 ~s will be apprecia-ted from the foregoing description, the series oE co-operating punches and dies 2a,3a, 2b,3b; 2c,3c; and 2d,3d may be operated by relatively unskilled personnel. The presently described method avoids -the need for skilled cutting of blanks, avoids the need for skilled cutting of the peripheral edges of the blanks by means of champfering tooling, which avoids the creation of cut chips of the material, and avoids any need to drill the so-formed champfered blanks.
We have found that there is less wastage of material by employing the series of punch operations as described hereinabove than there would be in seeking to perform similar operations by cutting tools. Moreover, even with relatively unskilled personnel, the resultant blanks prior to the cutting operation are relatively more uniform so that the file cuts le can be more readily formed and there is less likelihood of sharp edges to those cuts being created which would tend to lacerate the finger of the user of a lighter.
The series of punch operations further has the effect of forming an outer hardened layer lf (see Fig. 12) on the wheel having better hardness properties, tensile strength and yield point and a wear resistance which may be two to three times more than for flint wheels formed by other processes.
Claims (6)
1. A method of manufacturing rotatable ignition files or flint wheels, for example for lighters, comprising the steps of: cutting elongate wire stock of gauge appropriate to the desired diameter of the wheel into blanks of suitable size; applying a series of press operations to the blanks, as cut, by means of respective punches and dies to champfer or round off the peripheral edges of the blanks, to provide axial mounting holes, and to harden the respective surfaces of the blanks; and treating the circumferential surfaces of the respective blanks being formed to provide friction surfaces.
2. A method according to claim 1, wherein the friction surface is provided on each blank at the end of the press operations.
3. A method according to claim 1, wherein the press operations comprise the following steps in order:
guiding the cut blank into a die hole and applying pressure thereto by a pair of opposed punches to initially shape the blank; rounding off the peripheral edge of the blank at one axial end surface thereof by charging the shaped blank into a second die hole having a bottom formed with a rounded peripheral edge and applying pressure to the blank by means of a co-operating punch;
3. A method according to claim 1, wherein the press operations comprise the following steps in order:
guiding the cut blank into a die hole and applying pressure thereto by a pair of opposed punches to initially shape the blank; rounding off the peripheral edge of the blank at one axial end surface thereof by charging the shaped blank into a second die hole having a bottom formed with a rounded peripheral edge and applying pressure to the blank by means of a co-operating punch;
Claim 3 continued....
thereafter rounding off the peripheral edge of the blank at its other axial surface and simultaneously providing a central recess in each axial end surface of the blank by inverting the blank and charging it into a die hole having a bottom with a rounded peripheral edge and a small diameter guide channel for a small diameter punch opening in the centre of the said bottom, and applying pressure to the inverted blank in the bottom of the said die hole between a co-operating punch formed with a forward end protrusion on its axial centre line and the said small diameter punch; and thereafter forming a through aperture along the axial centre line of the blank by means of a punch die.
4. A method according to claim 2, wherein the press operations comprise the following steps in order:
guiding the cut blank into a die hole and applying pressure thereto by a pair of opposed punches to initially shape the blank; rounding off the peripheral edge of the blank at one axial end surface thereof by charging the shaped blank into a second die hole having a bottom formed with a rounded peripheral edge and applying pressure to the blank by means of a co-operating punch;
thereafter rounding off the peripheral edge of the blank at its other axial surface and simultaneously providing a central recess in each axial end surface of the blank by inverting the blank and charging it into a die hole having a bottom with a rounded peripheral edge and a small
thereafter rounding off the peripheral edge of the blank at its other axial surface and simultaneously providing a central recess in each axial end surface of the blank by inverting the blank and charging it into a die hole having a bottom with a rounded peripheral edge and a small diameter guide channel for a small diameter punch opening in the centre of the said bottom, and applying pressure to the inverted blank in the bottom of the said die hole between a co-operating punch formed with a forward end protrusion on its axial centre line and the said small diameter punch; and thereafter forming a through aperture along the axial centre line of the blank by means of a punch die.
4. A method according to claim 2, wherein the press operations comprise the following steps in order:
guiding the cut blank into a die hole and applying pressure thereto by a pair of opposed punches to initially shape the blank; rounding off the peripheral edge of the blank at one axial end surface thereof by charging the shaped blank into a second die hole having a bottom formed with a rounded peripheral edge and applying pressure to the blank by means of a co-operating punch;
thereafter rounding off the peripheral edge of the blank at its other axial surface and simultaneously providing a central recess in each axial end surface of the blank by inverting the blank and charging it into a die hole having a bottom with a rounded peripheral edge and a small
Claim 4 continued....
diameter guide channel for a small diameter punch opening in the centre of the said bottom, and applying pressure to the inverted blank in the bottom of the said die hole between a co-operating punch formed with a forward end protrusion on its axial centre line and the said small diameter punch; and -thereafter forming a through aperture along the axial centre line of the blank by means of a punch die.
diameter guide channel for a small diameter punch opening in the centre of the said bottom, and applying pressure to the inverted blank in the bottom of the said die hole between a co-operating punch formed with a forward end protrusion on its axial centre line and the said small diameter punch; and -thereafter forming a through aperture along the axial centre line of the blank by means of a punch die.
5. A method according to claim 3 or 4, wherein said wire stock consists of iron wire.
6. A method according to claim 1 or 2, wherein said wire stock comprises iron wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000446952A CA1224328A (en) | 1984-02-07 | 1984-02-07 | Manufacture of rotatable ignition files or flint wheels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000446952A CA1224328A (en) | 1984-02-07 | 1984-02-07 | Manufacture of rotatable ignition files or flint wheels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1224328A true CA1224328A (en) | 1987-07-21 |
Family
ID=4127133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000446952A Expired CA1224328A (en) | 1984-02-07 | 1984-02-07 | Manufacture of rotatable ignition files or flint wheels |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1224328A (en) |
-
1984
- 1984-02-07 CA CA000446952A patent/CA1224328A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |