CA1166606A - Method of manufacture of gravity screen separating cylinder - Google Patents
Method of manufacture of gravity screen separating cylinderInfo
- Publication number
- CA1166606A CA1166606A CA000391509A CA391509A CA1166606A CA 1166606 A CA1166606 A CA 1166606A CA 000391509 A CA000391509 A CA 000391509A CA 391509 A CA391509 A CA 391509A CA 1166606 A CA1166606 A CA 1166606A
- Authority
- CA
- Canada
- Prior art keywords
- groove
- grooves
- stamping
- sheet
- manufacture
- 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
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
- Pretreatment Of Seeds And Plants (AREA)
Abstract
10.
ABSTRACT OF THE DISCLOSURE
A method of manufacture of a gravity head cylindrical seed screen in which the cylinder is first formed by stamping grooves in parallel alignment in a metal sheet, stamping slots along the base of each of the grooves and then rolling the thus worked sheet so that the grooves are in the form of coaxial circular shapes.
ABSTRACT OF THE DISCLOSURE
A method of manufacture of a gravity head cylindrical seed screen in which the cylinder is first formed by stamping grooves in parallel alignment in a metal sheet, stamping slots along the base of each of the grooves and then rolling the thus worked sheet so that the grooves are in the form of coaxial circular shapes.
Description
1~666(:~6
2.
Thls invention relates to a methocl of manufacture of gravity fcd cylindrical separating screen.
The invention is particularly applicable to a screen adapted to provide an alignment of seed separation (the term seed to be understood to incorporate all forms of seed in the widest possible concept of this term wherever there is an applicable sizing technique required).
The problem has been hitherto that there has been generally no economically viable method to manufacture apparatus to perform this separating technique.
It has been considered that by providing such an alignment that is by providing an internal groove within a cylinder and then having a sizing gap or a separating gap below this or behind this that there would be good separa-iorl e~l-ects available.
The problem however has been to provide such a cylinder which not on]v mtlst provide this effect but must also be able to be mal~llEaclllred economically.
Obviously or-e~ could manufacture such a device by simply casting a unitary structure but the costs of dies and the therefore single cost of each separating cylinder made using this technique considering the marlcet available, makes such a proposal not economically and therefol-c commcrcially feasible.
One proposal envisages a metal sheet having a plurality o~ grooves form across the sheet ancl thereafter having a plurality of slots punched througll thc shcet in the troughs of the grooves and thereafter thc sheet 1~
`6
Thls invention relates to a methocl of manufacture of gravity fcd cylindrical separating screen.
The invention is particularly applicable to a screen adapted to provide an alignment of seed separation (the term seed to be understood to incorporate all forms of seed in the widest possible concept of this term wherever there is an applicable sizing technique required).
The problem has been hitherto that there has been generally no economically viable method to manufacture apparatus to perform this separating technique.
It has been considered that by providing such an alignment that is by providing an internal groove within a cylinder and then having a sizing gap or a separating gap below this or behind this that there would be good separa-iorl e~l-ects available.
The problem however has been to provide such a cylinder which not on]v mtlst provide this effect but must also be able to be mal~llEaclllred economically.
Obviously or-e~ could manufacture such a device by simply casting a unitary structure but the costs of dies and the therefore single cost of each separating cylinder made using this technique considering the marlcet available, makes such a proposal not economically and therefol-c commcrcially feasible.
One proposal envisages a metal sheet having a plurality o~ grooves form across the sheet ancl thereafter having a plurality of slots punched througll thc shcet in the troughs of the grooves and thereafter thc sheet 1~
`6
3.
being rolled so as to be formecl with the grooves following a circular path around the inside face of a cylinder then formed by the metal sheet.
A difficulty with this proposal is to provide for the grooves in the first instance.
Analysing this problem further, it has the economic viability of providing such grooves that is the difficulty in relation to the speciic art.
In other words provided there is unlimited funds, one can obviously achieve a product of this type perhaps by providing a cold roll line or otherwise, but such techniques are only viable in terms of large volumes in cases where the size shall be the same.
This is simply not feasible in terms of this parti-cular art in that e~en with large separation volumes being required, the number of devices as such need not be extensive and in an~ event, the separation between respective grooves has l~o L~c selectecl with some care for each application ancl mi3y in fact need to be tailor made for each particular case.
Use of a technique in which one groove at a time is pressed into the metal has been considered using a device generally referred to as a "press brake" but because the location of onc groove must bc closely related to a fol]owing groove, and the location of the first groove may necessarily hold the metal from being drawn into the subsequent groove upon pressing of this.
6(?~6t '~ .
At least that has been hitherto consi.dered to the extent that despite extensive investigation and advice, it has not been hitherto economically or commer-cially feasible to provide Eor manufacture oi such devices by using a press technique incorporating a press brake.
In the event, such convèntional advice has been proved to be wrong. .
By discovery and by development, it has now been discovered that it is possible to use a press brake technique to provide Eor grooves in sheets of metal for the purpose discussed and this can therefore be achieved both economically for the specialised application and to this extent it is commercially viable as an answer to the problem.
The inven~-ioll :in one iorm can be said to reside in the method oi m.lllufacture of a gravity head cylindrical seed screen, the steps o:E stamping by use o:E matching dies a first groove into a sheet of metal, the groove having a front sidc pr~rtioll a t'i~r side, and a base portion and then locating the thus formed groove a selected distance ~rorn a Lemale portion of the die for the stamping of a further groove parallel to the first groove, holding the sheet thus while stamping the next groove, then repeating said last step using the previously formed groove, cutting slots along the bnse of the grooves allcl sh;3p:ing thc thus worl<ed shcet into a cylinc3rical shape where the groovcs arc? each following a circular shape which is coaxial with the circular shape followed by adjacent grooves.
~ 't~6 5.
PreLe~a~ly the sheet of metal is held in an inter-locking relationship by the female die for a first groove when located for the stamping of a subsequent groove in the adjacent parallel alignment.
Preferably this interlocking relationship is effected by a rearward facing face of the female die being position-ed against a forward facing side of the front side of the first said groove.
The invention will be better understood with reference to a preferred embodiment which shall now be described with the assistance of drawings in which :-Figure 1 is a side elevation of the male and femaledies with a metal sheet about to be stamped for a succes-sive groove and Figure 2 is the sallle view as in Figure 1 with howe~ver the male (I;e having stamped the groove.
Referring in detail to the drawings, it will be seen that there is a em<ll( an-vil die 1 which includes a first platform portioTl ~ al-d then a rectangular depres-sion 3 having a front face 4, a rear face S and a base 6.
The front and rear faces 4 and 5 are at an inclined angle to the vertical of approximately as is shown 15 taper.
There is a second platform portion 7 and behind this a rearward facing face 8.
16~ 6 ~, .
The mo~ing or male portion of the die 9 as a protrud-ing shape portion 10 which includes a base portion 11, a forwar~ face 12 and a rearward face 13, thes~
being corr~spondingly i.nclined one with respect to the other to.match with appropriate metal therebetween the depression 3.
The metal sheet 14 has an ungrooved end 15 resting on support 16 and at the other end of the assembly the sheet 17 is retained in an interlocking position as is shown in Figure 1 by retainer 18.
The dies are located in a conventional. brake of conventional design so that upon successive coming together of the dies 1 and 9 there will be formed a further groove of elongated constant cross-sectional shape as illustrated in Figure 2.
By reason o~ the interlocking of the sheet 14 especially by h~lvill~, a rearward facing face 8 of the female die 1 engaging against the forward facing side 19 of the front side 20 of a previously formed groove, as well as having the sheet~ ~.lt 17 held by member 18, this ensures that as the (I-i.e 9 engages the metal, this pulls the sheet from encl 1~ Eor the urther formation of the groove.
Subsequent to the steps shown in Figures 1 and 2, the metal sheet is lifted from the interlocking position shown in Figure 2 so that the sheet 14 is then disp].aced by the depth of the groove and the sheet is then equivalent to the position as shown in Figure 1 and the operation is repeated.
~ 6~
Subsequent to all of the grooves being formed, these are then caused to have cut in the base portion, screening slots which are being cut in alignment wi.th the groove shape and subsequent to this each o.E sheets thus grooved and cut are rolled so that their outer surface, that is the base portion is outermost in the cylindrical shape and the grooves being previ.ously elongate are now formed so as to form a circular shape with successive grooves then being in coaxial alignment with each having their circular shape.
In a preferred instance, the grooves are approximately one centimetre deep and one centimetre across the base and the rounded edges are as is shown in the drawings and that the metal sheet selected can be made from either 16 through to 24 gauge metal.
The method Or l-nan~lfacture of screens in this manner has dramatically ;.nlpl~oved, the cost previously incurred in the man~lfacture of such articles and has been a very signi~:icant improvem~rlt in the art.
being rolled so as to be formecl with the grooves following a circular path around the inside face of a cylinder then formed by the metal sheet.
A difficulty with this proposal is to provide for the grooves in the first instance.
Analysing this problem further, it has the economic viability of providing such grooves that is the difficulty in relation to the speciic art.
In other words provided there is unlimited funds, one can obviously achieve a product of this type perhaps by providing a cold roll line or otherwise, but such techniques are only viable in terms of large volumes in cases where the size shall be the same.
This is simply not feasible in terms of this parti-cular art in that e~en with large separation volumes being required, the number of devices as such need not be extensive and in an~ event, the separation between respective grooves has l~o L~c selectecl with some care for each application ancl mi3y in fact need to be tailor made for each particular case.
Use of a technique in which one groove at a time is pressed into the metal has been considered using a device generally referred to as a "press brake" but because the location of onc groove must bc closely related to a fol]owing groove, and the location of the first groove may necessarily hold the metal from being drawn into the subsequent groove upon pressing of this.
6(?~6t '~ .
At least that has been hitherto consi.dered to the extent that despite extensive investigation and advice, it has not been hitherto economically or commer-cially feasible to provide Eor manufacture oi such devices by using a press technique incorporating a press brake.
In the event, such convèntional advice has been proved to be wrong. .
By discovery and by development, it has now been discovered that it is possible to use a press brake technique to provide Eor grooves in sheets of metal for the purpose discussed and this can therefore be achieved both economically for the specialised application and to this extent it is commercially viable as an answer to the problem.
The inven~-ioll :in one iorm can be said to reside in the method oi m.lllufacture of a gravity head cylindrical seed screen, the steps o:E stamping by use o:E matching dies a first groove into a sheet of metal, the groove having a front sidc pr~rtioll a t'i~r side, and a base portion and then locating the thus formed groove a selected distance ~rorn a Lemale portion of the die for the stamping of a further groove parallel to the first groove, holding the sheet thus while stamping the next groove, then repeating said last step using the previously formed groove, cutting slots along the bnse of the grooves allcl sh;3p:ing thc thus worl<ed shcet into a cylinc3rical shape where the groovcs arc? each following a circular shape which is coaxial with the circular shape followed by adjacent grooves.
~ 't~6 5.
PreLe~a~ly the sheet of metal is held in an inter-locking relationship by the female die for a first groove when located for the stamping of a subsequent groove in the adjacent parallel alignment.
Preferably this interlocking relationship is effected by a rearward facing face of the female die being position-ed against a forward facing side of the front side of the first said groove.
The invention will be better understood with reference to a preferred embodiment which shall now be described with the assistance of drawings in which :-Figure 1 is a side elevation of the male and femaledies with a metal sheet about to be stamped for a succes-sive groove and Figure 2 is the sallle view as in Figure 1 with howe~ver the male (I;e having stamped the groove.
Referring in detail to the drawings, it will be seen that there is a em<ll( an-vil die 1 which includes a first platform portioTl ~ al-d then a rectangular depres-sion 3 having a front face 4, a rear face S and a base 6.
The front and rear faces 4 and 5 are at an inclined angle to the vertical of approximately as is shown 15 taper.
There is a second platform portion 7 and behind this a rearward facing face 8.
16~ 6 ~, .
The mo~ing or male portion of the die 9 as a protrud-ing shape portion 10 which includes a base portion 11, a forwar~ face 12 and a rearward face 13, thes~
being corr~spondingly i.nclined one with respect to the other to.match with appropriate metal therebetween the depression 3.
The metal sheet 14 has an ungrooved end 15 resting on support 16 and at the other end of the assembly the sheet 17 is retained in an interlocking position as is shown in Figure 1 by retainer 18.
The dies are located in a conventional. brake of conventional design so that upon successive coming together of the dies 1 and 9 there will be formed a further groove of elongated constant cross-sectional shape as illustrated in Figure 2.
By reason o~ the interlocking of the sheet 14 especially by h~lvill~, a rearward facing face 8 of the female die 1 engaging against the forward facing side 19 of the front side 20 of a previously formed groove, as well as having the sheet~ ~.lt 17 held by member 18, this ensures that as the (I-i.e 9 engages the metal, this pulls the sheet from encl 1~ Eor the urther formation of the groove.
Subsequent to the steps shown in Figures 1 and 2, the metal sheet is lifted from the interlocking position shown in Figure 2 so that the sheet 14 is then disp].aced by the depth of the groove and the sheet is then equivalent to the position as shown in Figure 1 and the operation is repeated.
~ 6~
Subsequent to all of the grooves being formed, these are then caused to have cut in the base portion, screening slots which are being cut in alignment wi.th the groove shape and subsequent to this each o.E sheets thus grooved and cut are rolled so that their outer surface, that is the base portion is outermost in the cylindrical shape and the grooves being previ.ously elongate are now formed so as to form a circular shape with successive grooves then being in coaxial alignment with each having their circular shape.
In a preferred instance, the grooves are approximately one centimetre deep and one centimetre across the base and the rounded edges are as is shown in the drawings and that the metal sheet selected can be made from either 16 through to 24 gauge metal.
The method Or l-nan~lfacture of screens in this manner has dramatically ;.nlpl~oved, the cost previously incurred in the man~lfacture of such articles and has been a very signi~:icant improvem~rlt in the art.
Claims (4)
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In the method of manufacture of a gravity head cylindrical seed screen the steps of stamping by use of matching dies a first groove into a sheet of metal, a groove having a front side portion, a rear side portion, and a base portion, locating the thus formed groove a selected distance from a female portion of the die for the stamping of a further groove parallel to the first groove, holding the sheet thus while stamping the next groove, then repeating said last step using the previously formed groove, cutting screening slots along the base of the grooves, and shaping the thus worked sheet into a cylindrical shape with the grooves in circular shape with successive grooves in coaxial aligned circular shapes.
2. In the method of manufaxture of a gravity head cylindrical seed screen as in Claim 1 wherein the female die provides an interlocking relationship for a first groove when in position for the stamping of a subsequent groove.
3. In the method of manufacture of a gravity head cylindrical seed screen as in Claim 2 wherein the interlock-ing is effected by a rearward facing face of the female die being positioned against a forward facing side of the front side of the first said groove.
4. A gravity head cylindrical screen when manufactured by use of the method as set out in any one of Claim 1, 2 or 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU6798/80 | 1980-12-05 | ||
| AUPE679880 | 1980-12-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1166606A true CA1166606A (en) | 1984-05-01 |
Family
ID=3768869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000391509A Expired CA1166606A (en) | 1980-12-05 | 1981-12-04 | Method of manufacture of gravity screen separating cylinder |
Country Status (4)
| Country | Link |
|---|---|
| BR (1) | BR8107991A (en) |
| CA (1) | CA1166606A (en) |
| NZ (1) | NZ199166A (en) |
| ZA (1) | ZA818465B (en) |
-
1981
- 1981-12-03 NZ NZ19916681A patent/NZ199166A/en unknown
- 1981-12-04 CA CA000391509A patent/CA1166606A/en not_active Expired
- 1981-12-07 BR BR8107991A patent/BR8107991A/en unknown
- 1981-12-07 ZA ZA818465A patent/ZA818465B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BR8107991A (en) | 1982-09-14 |
| ZA818465B (en) | 1982-10-27 |
| NZ199166A (en) | 1985-09-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |