CA1311733C - Dual arbor scrap chopper - Google Patents
Dual arbor scrap chopperInfo
- Publication number
- CA1311733C CA1311733C CA000583789A CA583789A CA1311733C CA 1311733 C CA1311733 C CA 1311733C CA 000583789 A CA000583789 A CA 000583789A CA 583789 A CA583789 A CA 583789A CA 1311733 C CA1311733 C CA 1311733C
- Authority
- CA
- Canada
- Prior art keywords
- blade
- arbor
- arbors
- angularly
- dual
- 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 - Lifetime
Links
Landscapes
- Shearing Machines (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An improvement to a dual arbor scrap chopper for use for cutting scrap edge trims associated with flat sheet metal strip production. The scrap chopper utilizes a pair of rotary arbors, each having identical angularly displaced multiple sided blades aligned for progressive cutting registration with each other as the arbor rotates. Each of the blades are defines as a symmetrical multi-sided configuration allowing each blade to contain multiple usable cutting edges which can be exposed upon inversion, inverting or rotation of the blade selectively in its respective rotary arbor.
An improvement to a dual arbor scrap chopper for use for cutting scrap edge trims associated with flat sheet metal strip production. The scrap chopper utilizes a pair of rotary arbors, each having identical angularly displaced multiple sided blades aligned for progressive cutting registration with each other as the arbor rotates. Each of the blades are defines as a symmetrical multi-sided configuration allowing each blade to contain multiple usable cutting edges which can be exposed upon inversion, inverting or rotation of the blade selectively in its respective rotary arbor.
Description
t3~ ~73~
DUAL AI~B0~ SCI~AP CIIOPP~n Back~round o~ the Invention Technical Field:
. This invention rela-tes to high speed choppers that are used in scrap edge trimming ol ila-t sheet metal or other scrap strip producti.on processes that require effective collection and removal of large quantities of scrap strip material.
Description o~ Prior Art:
Prior Art devices of this type have relied on a variety of different configurations all aimed at the same end result o~ high speed incremental choppi.ng of strip scrap, see for e~ample U.S. Patents 2,125,939, U.S. Pa-tent 3,084,582 and U.S. Paten-t 3,799,020.
In U.S. Patent 2,125,939, a ro-tary shear kniie is disclosed tllat uses raked cutting edges on cutting knives positioned on drums so that they register as opposing knives are brought together to shear the material. Each of the knives cutting edges are of an involuted curved 20 con~iguratlon so that the cut will be square in relation to Ir~
~1--.
, the strip being cut.
Patent 3,084,582 discloses a ro-tatable shearing blade device Ior progressive transverse CUttillg using a pair o~ blades each mounted on a separate splndle with a gear teeth mecilanislll inner-connec-ting them. ~ach blade is held by bolts and springs for relative adjustmellt. ~ach blade has only vne cutting edge Ior engagement against the material tv be cut.
In U.S. Patent 3,799,020 a scrap chopper is shown having a fixed sta~ion lsniIe and a multiple bladed rotary arbor aligned Ior cut-ting registra-tion therewith.
Summarv_o~ the Inven-tion A dual arbor scrap c.hopper ~or use with high speed flat sheet trimming processes that uses multiple edge cutting blades on dual arbors Ior progressive registration CUttillg using .curved cutting edges conIiguratioll Ior reduced blade wear and decrease noise which is desireable in manuIac-turing environnients.
Description o~ the Drawin~s Figure 1 is a perspective view of the dual arbor scrap .. , .. .. , . ~ . .
.
. ~ . , .
- .:
: :, , chopper with associated drive unit;
Figure 2 is a transverse end section of the dual arbor scrap choppered arbors with blade portions and material feeding guide;
Figure 3 is an end view on lines 3-3 o~ Figure 2;
Figure 4 is a top plan view of relative blade position on the arbor.
Figure 5 is graphic illustrat:ion of blade curve determina-tion; and Figure 6 is a perspective view of a single blade and its associated cutting edges.
Descrip-tion of the Preferred Embodiment A dua]. arbor scrap chopper can be seen in Figure 1 of the drawings comprising a mounting enclosure 10 securing to a base 11 by a plurality of fasteners 1~. The mounting enclosure 10 has an opening at 13 in which is posi-tioned a pair of rotating arbors 14 and 15 with associated support bearings and inner-connected speed regulator gearing reduction mechanism connected to a motor 16 as will be well understood and known in the art.
Referring now to Figures 2,3, and 4 of the drawings, each of the arbors 14 and 15 has an unique contour outer surface configuration defined by a pair o~ oppositely disposed angularly aligned transverse recesses 17 and 1~. A flattened - : :
.
surface area 19 extends from each transverse recess and provides material c].earance as will be explained in greater detail later.
Each of the transverse recesses 17 and 18 ex-tend from the flattened sur~ace area 19 to an angular upstanding edge mount 20 which is apertured at 21 for a blade fastener bolt 22.
The surface o~ the transverse recess 17 and 18 are concave transversely parallel with the upstanding edge mount 20 de~ining a blade seat 23. A pair of identical blades 24 are positioned on each drum, one in each blade seat 23. Each of the blades 2~
is made from a bar blank of a known length, height and thickness having spaced parallel side surfaces 24A and B~ which is then machined to form longitudinally curved transversely flat upper and lower surfaces 25 and 26 at right angles to said side suriaces 24A and B. Each curved surface having t~o matching oppositely disposed cutting edges 27 and 28. The curved upper and lower surfaces 25 and 26 are defined by true radius not requiring any extensive or difficult compound curved or helical blade formation.
The blade seat 23 conforms to the blade surfaces 25 and 26 so that the blades 24 when mounted thereon by the blade fastener bolt 22 are reversible both front to bac~ and top to bottom giving access .
to all :Eour cut-ting edges.
Due to the arbor con~igura-tion and blade configuration a unique cu-tting ability is available upon matched counter rotation of the arbors -to bring a pair oI oppositely disposed blades and there associated cutting edges into progressive shearing relationship required for cutting strip scrap material at high speed.
To achieve such blade configuration and placement for maximum progressive blade engagement it was necessary to determine the correct blade radius to be formed by use o~ a true ellipse or the equivalent avoiding a helical blade as here before used. To determine such a radius it is necessary to view the nature of the cutting required on a cylindrical surface and con~ert same to a radius that would perform as a helical blade without the time and expense of helical blade nlanufac-ture.
Referring now to figure 5 of -the drawings, a graphic of the comparison between a true elliptical line E and a true radius R on the blade 24 is shown.
A portion of an ellipse is represented on the line E.
~.. ~....... - - . -The representative blade area i.e. the portion o~ the line E
over which ideally the cutting edge of the blade would fall is de~ined by the letters BA, since in reality only a small portion o the true ellipse can be used in a dual arbor con-figuration. The relative line position shown in Figure 5 and6 is exaggerated ~or illustration purposes.
One of the cutting edges 27, 28 on the blade 24 is shown in broken lines superimposed over the elliptical line E. To determine a exceptable simple radius R for the curved sur~aces 25 and 26, a crossover point CP is calcula-ted as the dis-tance from the center o~ the blade where the line E is intersected by the proposed radius of the curved surface of the blade. An example o~ the same is illustrated in Figure 5 as having a cross over point o~ 1.75 inches ~roM center wi-th a calculated radius of 19.~845 having a O deviation from the true elliptical line E at A, which is the center o~ the blade, and at the cross over point o~ 1.75 inches indicated by CP. ~he deviation of the selected radius (19.8~5) R is under the elliptical line E and is indicated graphically as~a shaded area indica-ted by the letter U.
Conversely pass the cross over point CP at 1.75 ~rom the cen-ter of the blade the deviation of the selected radius is over or above the elliptical line E as indicated by the letter 0.
The amount of deviation of the selected radius from the elliptical line E that is acceptable is in direct relation to the thickness of the material to be cut. The greater the material thickness, the greater the amount of deviation can be tolerated while the thinner material must have lsss deviation.
Referring to Figure 2 of the drawings, a resilient sound pad 29 is shown fastened to the arbors 14 and 15 between their respective angularly upstanding edge mounts 20 to the angularly aligned transverse recesses 17 and 18 forming in opposition a quiet resilient path for the material being cut to follow between the arbors prior to cutting. The resilien-t sound pad 29 is contoured to compensate for arbor shape varia-tion and is accordingly of varying thickness.
It wlll thus be seen that a new and novel dual arbor chopper has been illustrated and described and that a method for blade configuration has been illustrated whlch effectively determines the simple radius on a curved blade which is within the realm of a true three dimensional elliptical surface shear configuration .
..... ~. .
'' . .
:: .
required ~or increased e~iciency and low sound emissions.
There~ore, having thus described my invention I claim:
:
' " ~ ' `
' ' ' :~ :
.
DUAL AI~B0~ SCI~AP CIIOPP~n Back~round o~ the Invention Technical Field:
. This invention rela-tes to high speed choppers that are used in scrap edge trimming ol ila-t sheet metal or other scrap strip producti.on processes that require effective collection and removal of large quantities of scrap strip material.
Description o~ Prior Art:
Prior Art devices of this type have relied on a variety of different configurations all aimed at the same end result o~ high speed incremental choppi.ng of strip scrap, see for e~ample U.S. Patents 2,125,939, U.S. Pa-tent 3,084,582 and U.S. Paten-t 3,799,020.
In U.S. Patent 2,125,939, a ro-tary shear kniie is disclosed tllat uses raked cutting edges on cutting knives positioned on drums so that they register as opposing knives are brought together to shear the material. Each of the knives cutting edges are of an involuted curved 20 con~iguratlon so that the cut will be square in relation to Ir~
~1--.
, the strip being cut.
Patent 3,084,582 discloses a ro-tatable shearing blade device Ior progressive transverse CUttillg using a pair o~ blades each mounted on a separate splndle with a gear teeth mecilanislll inner-connec-ting them. ~ach blade is held by bolts and springs for relative adjustmellt. ~ach blade has only vne cutting edge Ior engagement against the material tv be cut.
In U.S. Patent 3,799,020 a scrap chopper is shown having a fixed sta~ion lsniIe and a multiple bladed rotary arbor aligned Ior cut-ting registra-tion therewith.
Summarv_o~ the Inven-tion A dual arbor scrap c.hopper ~or use with high speed flat sheet trimming processes that uses multiple edge cutting blades on dual arbors Ior progressive registration CUttillg using .curved cutting edges conIiguratioll Ior reduced blade wear and decrease noise which is desireable in manuIac-turing environnients.
Description o~ the Drawin~s Figure 1 is a perspective view of the dual arbor scrap .. , .. .. , . ~ . .
.
. ~ . , .
- .:
: :, , chopper with associated drive unit;
Figure 2 is a transverse end section of the dual arbor scrap choppered arbors with blade portions and material feeding guide;
Figure 3 is an end view on lines 3-3 o~ Figure 2;
Figure 4 is a top plan view of relative blade position on the arbor.
Figure 5 is graphic illustrat:ion of blade curve determina-tion; and Figure 6 is a perspective view of a single blade and its associated cutting edges.
Descrip-tion of the Preferred Embodiment A dua]. arbor scrap chopper can be seen in Figure 1 of the drawings comprising a mounting enclosure 10 securing to a base 11 by a plurality of fasteners 1~. The mounting enclosure 10 has an opening at 13 in which is posi-tioned a pair of rotating arbors 14 and 15 with associated support bearings and inner-connected speed regulator gearing reduction mechanism connected to a motor 16 as will be well understood and known in the art.
Referring now to Figures 2,3, and 4 of the drawings, each of the arbors 14 and 15 has an unique contour outer surface configuration defined by a pair o~ oppositely disposed angularly aligned transverse recesses 17 and 1~. A flattened - : :
.
surface area 19 extends from each transverse recess and provides material c].earance as will be explained in greater detail later.
Each of the transverse recesses 17 and 18 ex-tend from the flattened sur~ace area 19 to an angular upstanding edge mount 20 which is apertured at 21 for a blade fastener bolt 22.
The surface o~ the transverse recess 17 and 18 are concave transversely parallel with the upstanding edge mount 20 de~ining a blade seat 23. A pair of identical blades 24 are positioned on each drum, one in each blade seat 23. Each of the blades 2~
is made from a bar blank of a known length, height and thickness having spaced parallel side surfaces 24A and B~ which is then machined to form longitudinally curved transversely flat upper and lower surfaces 25 and 26 at right angles to said side suriaces 24A and B. Each curved surface having t~o matching oppositely disposed cutting edges 27 and 28. The curved upper and lower surfaces 25 and 26 are defined by true radius not requiring any extensive or difficult compound curved or helical blade formation.
The blade seat 23 conforms to the blade surfaces 25 and 26 so that the blades 24 when mounted thereon by the blade fastener bolt 22 are reversible both front to bac~ and top to bottom giving access .
to all :Eour cut-ting edges.
Due to the arbor con~igura-tion and blade configuration a unique cu-tting ability is available upon matched counter rotation of the arbors -to bring a pair oI oppositely disposed blades and there associated cutting edges into progressive shearing relationship required for cutting strip scrap material at high speed.
To achieve such blade configuration and placement for maximum progressive blade engagement it was necessary to determine the correct blade radius to be formed by use o~ a true ellipse or the equivalent avoiding a helical blade as here before used. To determine such a radius it is necessary to view the nature of the cutting required on a cylindrical surface and con~ert same to a radius that would perform as a helical blade without the time and expense of helical blade nlanufac-ture.
Referring now to figure 5 of -the drawings, a graphic of the comparison between a true elliptical line E and a true radius R on the blade 24 is shown.
A portion of an ellipse is represented on the line E.
~.. ~....... - - . -The representative blade area i.e. the portion o~ the line E
over which ideally the cutting edge of the blade would fall is de~ined by the letters BA, since in reality only a small portion o the true ellipse can be used in a dual arbor con-figuration. The relative line position shown in Figure 5 and6 is exaggerated ~or illustration purposes.
One of the cutting edges 27, 28 on the blade 24 is shown in broken lines superimposed over the elliptical line E. To determine a exceptable simple radius R for the curved sur~aces 25 and 26, a crossover point CP is calcula-ted as the dis-tance from the center o~ the blade where the line E is intersected by the proposed radius of the curved surface of the blade. An example o~ the same is illustrated in Figure 5 as having a cross over point o~ 1.75 inches ~roM center wi-th a calculated radius of 19.~845 having a O deviation from the true elliptical line E at A, which is the center o~ the blade, and at the cross over point o~ 1.75 inches indicated by CP. ~he deviation of the selected radius (19.8~5) R is under the elliptical line E and is indicated graphically as~a shaded area indica-ted by the letter U.
Conversely pass the cross over point CP at 1.75 ~rom the cen-ter of the blade the deviation of the selected radius is over or above the elliptical line E as indicated by the letter 0.
The amount of deviation of the selected radius from the elliptical line E that is acceptable is in direct relation to the thickness of the material to be cut. The greater the material thickness, the greater the amount of deviation can be tolerated while the thinner material must have lsss deviation.
Referring to Figure 2 of the drawings, a resilient sound pad 29 is shown fastened to the arbors 14 and 15 between their respective angularly upstanding edge mounts 20 to the angularly aligned transverse recesses 17 and 18 forming in opposition a quiet resilient path for the material being cut to follow between the arbors prior to cutting. The resilien-t sound pad 29 is contoured to compensate for arbor shape varia-tion and is accordingly of varying thickness.
It wlll thus be seen that a new and novel dual arbor chopper has been illustrated and described and that a method for blade configuration has been illustrated whlch effectively determines the simple radius on a curved blade which is within the realm of a true three dimensional elliptical surface shear configuration .
..... ~. .
'' . .
:: .
required ~or increased e~iciency and low sound emissions.
There~ore, having thus described my invention I claim:
:
' " ~ ' `
' ' ' :~ :
.
Claims (4)
1. A dual arbor scrap chopper comprising: a support housing, a pair of oppositely disposed arbors rotatably positioned within said housing, drive means interconnecting and controlling relative rotational speed of said arbors, at least one blade on each arbor, each blade having spaced parallel side surfaces and being secured angularly and transversely of said arbors, said at least one blade on each arbor being oppositely disposed in relation to one another, means for mounting said at least one blade on said arbor in angularly transverse relation, said means for mounting including oppositely disposed concave transverse recesses, said means for mounting further including an angularly upstanding edge mount against which said at least one blade is positioned, each of said blades being substantially the same length, height and width, said blades each having outwardly curved transversely flat oppositely disposed upper and lower surfaces at right angles to said side surfaces, cutting edges formed at the intersection of each of said side surfaces and said upper and lower surfaces, the oppositely disposed blades on said arbors being disposed to contact upon matched rotation of said arbors to align their outwardly curved surfaces and associated cutting edges into progressive shearing relationship whereby scrap metal material may be cut at high speeds.
2. A dual arbor scrap chopper of claim 1 wherein said angularly upstanding edge mount is apertured and is disposed in parallel relation to said concave transverse recess, a fastener secured through said apertured angular upstanding edge mount and to said blade positione thereagainst.
3. The dual arbor scrap chopper of claim 1 wherein said drive and control means for arbors comprises a motor, inter-connected speed regulation with gearing reduction and a power source.
4. A dual arbor scrap chopper of claim 2 wherein said arbors have a resilient sound pad secured between said angularly upstanding edge mount and said angularly aligned concave transverse recesses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000583789A CA1311733C (en) | 1988-11-22 | 1988-11-22 | Dual arbor scrap chopper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000583789A CA1311733C (en) | 1988-11-22 | 1988-11-22 | Dual arbor scrap chopper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1311733C true CA1311733C (en) | 1992-12-22 |
Family
ID=4139147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000583789A Expired - Lifetime CA1311733C (en) | 1988-11-22 | 1988-11-22 | Dual arbor scrap chopper |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1311733C (en) |
-
1988
- 1988-11-22 CA CA000583789A patent/CA1311733C/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |