CA1056707A - Method and machine for bending flat strip to a cylindrical shape - Google Patents
Method and machine for bending flat strip to a cylindrical shapeInfo
- Publication number
- CA1056707A CA1056707A CA260,848A CA260848A CA1056707A CA 1056707 A CA1056707 A CA 1056707A CA 260848 A CA260848 A CA 260848A CA 1056707 A CA1056707 A CA 1056707A
- Authority
- CA
- Canada
- Prior art keywords
- strip
- guideway
- cylindrical shape
- bent
- bending
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Method and machine for bending flat strip to exact full cylindrical shape in which the strip part is rolled to a cylindrical shape over a length, measured in peripheral direction, which is greater than the circumference of the cylinder, the bent strip part being elastically deflected outwards during rolling, a portion then being separated from the bent strip the length of which is exactly equal to the circumference of the desired cylinder, so that a true cylindrical shape is formed after the elastic recovery of the separated deflected portion.
Method and machine for bending flat strip to exact full cylindrical shape in which the strip part is rolled to a cylindrical shape over a length, measured in peripheral direction, which is greater than the circumference of the cylinder, the bent strip part being elastically deflected outwards during rolling, a portion then being separated from the bent strip the length of which is exactly equal to the circumference of the desired cylinder, so that a true cylindrical shape is formed after the elastic recovery of the separated deflected portion.
Description
This invention relates to a method and a machine for bending flat strip to a cylindrical shape, use being made of a rolling mill comprising at least three rolls.
Such bending machines for implementing said method are already included in the art. These bending machines, however, have the disadvantage that it is never possible to obtain a true cylindrical shape, at least not with the embodiments of such bending machines hitherto known.
This is caused by the fact that a flat strip, fed into the rolling mill, is bent at the front end of the strip with a radius of curvature that differs slightly from that of the next part of the strip, which is supported by the three rolls in a different manner than was the case for the front end of the strip.
At a given moment following the introduction of the strip, the strip is flush, along a tangent line, with the first two rolls, while the strip end butts against the third roll.
At this third roll, the strip end can at first be inclined, within certain limits, at a relatively random angle to a tangent line at the point of contact with this roll. Once the strip has passed all of the three rolls, however, contact at all rolls takes place along a tangent line. As a result, the front end of the bent strip has a radius of curvature which varies from that of the greater part of the rounded strip.
This also applies to the rear end when this is sheared or cut off the strip stock and then passed through the rolls.
According to the invention, the aforementioned drawback is met by implementing the method in such a way that the strip part is rolled to a cylindrical shape over a length, measured in peripheral direction, which is greater than the circumference of the cylinder, the bent strip part being elastically deflected outwards during rolling, a portion then being separated from the bent strip the length of which is exactly equal to the circumference of the desired cylinder, so that a true cylindrical shape is formed after the elastic recovery of the separated deflected portion.
The invention also provides a bending machine for bending flat strip to a cylindrical shape by means of a rolling mill comprising at least three rolls, and an element which elastically deflects the rounded strip end in a direction which causes the radius of curvature of the rounded strip part to become greater than the radius of curvature which this strip part has in the released state, characterized in that means are provided for separating from the strip which is being fed a bent strip portion having a length equal to the circumference of the desired cylinder.
It has thus become possible to roll with the three rolls more than 360 deg. of the cylindrical bent strip, these 360 deg. being measured along the circumference of the cylindrical shape which results when the elastic deflection is released.
Preferably, means are provided for fixing exactly the length of the strip part which is fed per operation into the rolling mill, so as to be fully independent of any linear dispensing by the rolls. In such case, roll slippage along the strip could result in the impossibility of exactly maintaining the size of the cylinder eventually formed.
It has been found in practice that a highly favourable solution consists in the use of at least two strip clamps which are each alternately opened and closed, in such a way that one clamp is opened while the other is closed, and conversely, not more than one clamp having a fixed position on the machine and at least one clamp being capable of performing a translating motion in the feed direction of the strip.
The separating means can be constituted by a sawing machine, a cutter, a flame cutter, shears, etc. The only condition in this respect is that such a machine for separating the greater part of the bent strip transversely to the length of the ~OS6707 strip which is being fed must be capable of performing a translating motion with respect to this strip. The same effect can naturally be obtained if the strip can perform a translating motion with respect to the separating machine. After the bending process, it is furthermore necessary for the bent portion of the strip to be conveyed to the machine which performs the separation of the cylinder produced.
To this end, it is possible, for example, to provide at least one roll axially displaceable transversely to the feed direction of the stripO This allows such a roll to be entirely removed from the loop of the bent strip, so that the latter can be freely conveyed to a separating machine. For this purpose, the rolling mill can be housed in a support which is slidably mounted on the machine in the direction of feed of the strip.
The element which elastically deflects the rounded strip part can be designed as a curved, substantially half-moon guideway which is located inside the bent strip part and which partially encircles one of the rolls, one end of the guideway being provided near the roll surface and the other end being at the required distance from the roll surface.
In case the thickness and the diameter of the material to be bent should cause the separated cylindrical part to close about a roll, use can be made of a guideway comprising at least two guideway components, one guideway component of which occupies a fixed position with respect to the roll which is located inside it, the other guideway component being capable of performing a swivelling movement, so that the remote end of the guideway can move toward and away from the roll surface.
The separated cylindrical part is thus received removably, since it is prevented from locking on the guideway. Accordingly, the formed cylindrical part can be conveniently removed from the bending machine, for example through a discharge chute on the underside of the machineO
~056707 Some embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings~ in which:
Figure 1 is a side view of the supply strip at the start of the bending operationO
Figure 2 shows the same supply strip at the end of the bending operation.
Figure 3 shows the cylindrical product formed, likewise as a lateral view.
Figure 4 is a diagram of a bending machine in a vertical partial section~ at the start of the bending operation.
Figure S shows the same machine as Figure 4, but at the end of the bending operation.
Figure 6 shows another embodiment of a bending machine.
Figure 7 shows an element for deflecting the bent strip.
Figure 8 shows a variant of the element of Figure 7.
In Figure 1, the strip 1 which is being supplied is shown in a side view. The portion 2 has already been partially bent in the rollers (not shown). Portion 3, just like portion 4, is a strip part which has been properly dispensed for the bending operationO This means that the length of the strip portions between the points 5, 6, 7 and 8 is equal, or equalized, during the feeding operation by the aforementioned dispensing device.
Figure 2 is a schematic side view of the situation when the bending operation for producing a new cylindrical part has been completed.
The strip part 2 has now been fully bent into the shape 12, the strip part 3 having advanced to the position 13, and the strip part 4 to the position 14. The number 19 indicates an element which applies such a force to the end 15 of the strip part 12 that this is bent open outwardly over such a distance that the elastic limit of the material is not exceeded.
1056~707 This means that, when the element 19 no longer applies force to the end 15, the strip part 12 will spring back fully elastically and assume the shape imparted to it by the rolls of the rolling mill (not shown). The number 17 indicates a cutting apparatus, such as, for example, a circular saw. This saw is so arranged as to be able to cut through the strip part 12 at point 16. This point 16 had the position 6 in Figure 1.
When the sawing machine 17 has severed the strip part 12, the true cylindrical shape 22 is formed as shown in Figure 3. The ends 26 and 25 of the rounded strip are here drawn at a small distance from each other for greater clarity. Actually, the gap 27 left between the ends 25 and 26 can be made as small as desired by a proper adjustment of the dispensing operation and of the rollers of the bending machine. If required, therefore, the gap 27 can be made equal to 7eroO
Figure 4 shows a bending machine 28 into which a strip 29 is fed.
The number 30 indicates a clamp which is slidably mounted on the machine and which can be opened and closed. Three rolls 31, 32 and 33 are housed in a support 34 of the machine. A second clamp 35 is mounted inside this support and can likewise be opened or closed, as requiredO The number 36 indicates a cutting mechanism.
Figure 5 illustrates the same machine at the moment at which the operation of bending the strip end has been completedO The sliding clamp 30 has now come very close to the support 34, clamp 30 having been closed and clamp 35 opened during the bending operation.
The strip part 38 has remained bent open under the action of the element 37. The bent cylindrical part, having been cut off by the cutting mechanism 39, rolls down as a true cylinder 40 through the discharge chute 41 of the machine.
Figure 6 shows a variant of the bending machine described hereinabove, in which the strip is not bent downwards but upwards. The rolls again bear the reference numbers 31, 32 and 33, and are again housed in the support 34. The cutting mechanism 42 now occupies a slightly higher position and the drive unit 43 of the machine is shown in slightly more detail. ~s distinct from the machine of Figure 4, the clamp 44 is here mounted in a fixed position on the machine, while the clamp 45 can perform a translation along the machine under the driving action of the traversing mechanism 46 which is in turn driven by the drive unit 43.
It is naturally possible to vary the bending machine in many ways within the scope of the invention. It is possible, for example, to displace the support 34 along the machine bed and to mount the clamp 30 (see Figure 4) in a fixed position on the machine. The support 34 (see Figure 5) can furthermore be displaced along the machine bed for the purpose of removing the rolling mill while the cutting mechanism is severing the cylinder. This is shown schematically in Figure 5 by dotting the lower roll, which in the dotted form bears the reference number 47. This means that this roll has been transversely removed from the loop 38, so that the support with the rolls can be displaced along the machine bed, whereupon the severing operation can be performed with the aid of the cutting mechanismO
Figure 7 shows the shape which a deflecting element 48 can have to cause the bent part 38 of the strip 29 to be deflected outwardly.
This element is a guideway of which the front end 49 is placed as near as possible to the outer surface of the roll 33. This part 49 is furthermore tapered, so that the front part of the bent strip 38 can be conveniently passed along the outer surface 51 of the guideway 48.
Figure 8 illustrates a variant of Figure 7, according to which the guideway is composed of a fixed component 52 and a movable component 53, in such a way that 53 can turn on a pivot 54. The end 55 of the guideway component 53 rests against a fixed stop 58 and is held down by a ~pring 56 which is supported on a fixed part 57 of the machine. Since the component 53 can spring inwardly, the severed strip part 38 is prevented from locking on to the guideway assembly 52-53.
Such bending machines for implementing said method are already included in the art. These bending machines, however, have the disadvantage that it is never possible to obtain a true cylindrical shape, at least not with the embodiments of such bending machines hitherto known.
This is caused by the fact that a flat strip, fed into the rolling mill, is bent at the front end of the strip with a radius of curvature that differs slightly from that of the next part of the strip, which is supported by the three rolls in a different manner than was the case for the front end of the strip.
At a given moment following the introduction of the strip, the strip is flush, along a tangent line, with the first two rolls, while the strip end butts against the third roll.
At this third roll, the strip end can at first be inclined, within certain limits, at a relatively random angle to a tangent line at the point of contact with this roll. Once the strip has passed all of the three rolls, however, contact at all rolls takes place along a tangent line. As a result, the front end of the bent strip has a radius of curvature which varies from that of the greater part of the rounded strip.
This also applies to the rear end when this is sheared or cut off the strip stock and then passed through the rolls.
According to the invention, the aforementioned drawback is met by implementing the method in such a way that the strip part is rolled to a cylindrical shape over a length, measured in peripheral direction, which is greater than the circumference of the cylinder, the bent strip part being elastically deflected outwards during rolling, a portion then being separated from the bent strip the length of which is exactly equal to the circumference of the desired cylinder, so that a true cylindrical shape is formed after the elastic recovery of the separated deflected portion.
The invention also provides a bending machine for bending flat strip to a cylindrical shape by means of a rolling mill comprising at least three rolls, and an element which elastically deflects the rounded strip end in a direction which causes the radius of curvature of the rounded strip part to become greater than the radius of curvature which this strip part has in the released state, characterized in that means are provided for separating from the strip which is being fed a bent strip portion having a length equal to the circumference of the desired cylinder.
It has thus become possible to roll with the three rolls more than 360 deg. of the cylindrical bent strip, these 360 deg. being measured along the circumference of the cylindrical shape which results when the elastic deflection is released.
Preferably, means are provided for fixing exactly the length of the strip part which is fed per operation into the rolling mill, so as to be fully independent of any linear dispensing by the rolls. In such case, roll slippage along the strip could result in the impossibility of exactly maintaining the size of the cylinder eventually formed.
It has been found in practice that a highly favourable solution consists in the use of at least two strip clamps which are each alternately opened and closed, in such a way that one clamp is opened while the other is closed, and conversely, not more than one clamp having a fixed position on the machine and at least one clamp being capable of performing a translating motion in the feed direction of the strip.
The separating means can be constituted by a sawing machine, a cutter, a flame cutter, shears, etc. The only condition in this respect is that such a machine for separating the greater part of the bent strip transversely to the length of the ~OS6707 strip which is being fed must be capable of performing a translating motion with respect to this strip. The same effect can naturally be obtained if the strip can perform a translating motion with respect to the separating machine. After the bending process, it is furthermore necessary for the bent portion of the strip to be conveyed to the machine which performs the separation of the cylinder produced.
To this end, it is possible, for example, to provide at least one roll axially displaceable transversely to the feed direction of the stripO This allows such a roll to be entirely removed from the loop of the bent strip, so that the latter can be freely conveyed to a separating machine. For this purpose, the rolling mill can be housed in a support which is slidably mounted on the machine in the direction of feed of the strip.
The element which elastically deflects the rounded strip part can be designed as a curved, substantially half-moon guideway which is located inside the bent strip part and which partially encircles one of the rolls, one end of the guideway being provided near the roll surface and the other end being at the required distance from the roll surface.
In case the thickness and the diameter of the material to be bent should cause the separated cylindrical part to close about a roll, use can be made of a guideway comprising at least two guideway components, one guideway component of which occupies a fixed position with respect to the roll which is located inside it, the other guideway component being capable of performing a swivelling movement, so that the remote end of the guideway can move toward and away from the roll surface.
The separated cylindrical part is thus received removably, since it is prevented from locking on the guideway. Accordingly, the formed cylindrical part can be conveniently removed from the bending machine, for example through a discharge chute on the underside of the machineO
~056707 Some embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings~ in which:
Figure 1 is a side view of the supply strip at the start of the bending operationO
Figure 2 shows the same supply strip at the end of the bending operation.
Figure 3 shows the cylindrical product formed, likewise as a lateral view.
Figure 4 is a diagram of a bending machine in a vertical partial section~ at the start of the bending operation.
Figure S shows the same machine as Figure 4, but at the end of the bending operation.
Figure 6 shows another embodiment of a bending machine.
Figure 7 shows an element for deflecting the bent strip.
Figure 8 shows a variant of the element of Figure 7.
In Figure 1, the strip 1 which is being supplied is shown in a side view. The portion 2 has already been partially bent in the rollers (not shown). Portion 3, just like portion 4, is a strip part which has been properly dispensed for the bending operationO This means that the length of the strip portions between the points 5, 6, 7 and 8 is equal, or equalized, during the feeding operation by the aforementioned dispensing device.
Figure 2 is a schematic side view of the situation when the bending operation for producing a new cylindrical part has been completed.
The strip part 2 has now been fully bent into the shape 12, the strip part 3 having advanced to the position 13, and the strip part 4 to the position 14. The number 19 indicates an element which applies such a force to the end 15 of the strip part 12 that this is bent open outwardly over such a distance that the elastic limit of the material is not exceeded.
1056~707 This means that, when the element 19 no longer applies force to the end 15, the strip part 12 will spring back fully elastically and assume the shape imparted to it by the rolls of the rolling mill (not shown). The number 17 indicates a cutting apparatus, such as, for example, a circular saw. This saw is so arranged as to be able to cut through the strip part 12 at point 16. This point 16 had the position 6 in Figure 1.
When the sawing machine 17 has severed the strip part 12, the true cylindrical shape 22 is formed as shown in Figure 3. The ends 26 and 25 of the rounded strip are here drawn at a small distance from each other for greater clarity. Actually, the gap 27 left between the ends 25 and 26 can be made as small as desired by a proper adjustment of the dispensing operation and of the rollers of the bending machine. If required, therefore, the gap 27 can be made equal to 7eroO
Figure 4 shows a bending machine 28 into which a strip 29 is fed.
The number 30 indicates a clamp which is slidably mounted on the machine and which can be opened and closed. Three rolls 31, 32 and 33 are housed in a support 34 of the machine. A second clamp 35 is mounted inside this support and can likewise be opened or closed, as requiredO The number 36 indicates a cutting mechanism.
Figure 5 illustrates the same machine at the moment at which the operation of bending the strip end has been completedO The sliding clamp 30 has now come very close to the support 34, clamp 30 having been closed and clamp 35 opened during the bending operation.
The strip part 38 has remained bent open under the action of the element 37. The bent cylindrical part, having been cut off by the cutting mechanism 39, rolls down as a true cylinder 40 through the discharge chute 41 of the machine.
Figure 6 shows a variant of the bending machine described hereinabove, in which the strip is not bent downwards but upwards. The rolls again bear the reference numbers 31, 32 and 33, and are again housed in the support 34. The cutting mechanism 42 now occupies a slightly higher position and the drive unit 43 of the machine is shown in slightly more detail. ~s distinct from the machine of Figure 4, the clamp 44 is here mounted in a fixed position on the machine, while the clamp 45 can perform a translation along the machine under the driving action of the traversing mechanism 46 which is in turn driven by the drive unit 43.
It is naturally possible to vary the bending machine in many ways within the scope of the invention. It is possible, for example, to displace the support 34 along the machine bed and to mount the clamp 30 (see Figure 4) in a fixed position on the machine. The support 34 (see Figure 5) can furthermore be displaced along the machine bed for the purpose of removing the rolling mill while the cutting mechanism is severing the cylinder. This is shown schematically in Figure 5 by dotting the lower roll, which in the dotted form bears the reference number 47. This means that this roll has been transversely removed from the loop 38, so that the support with the rolls can be displaced along the machine bed, whereupon the severing operation can be performed with the aid of the cutting mechanismO
Figure 7 shows the shape which a deflecting element 48 can have to cause the bent part 38 of the strip 29 to be deflected outwardly.
This element is a guideway of which the front end 49 is placed as near as possible to the outer surface of the roll 33. This part 49 is furthermore tapered, so that the front part of the bent strip 38 can be conveniently passed along the outer surface 51 of the guideway 48.
Figure 8 illustrates a variant of Figure 7, according to which the guideway is composed of a fixed component 52 and a movable component 53, in such a way that 53 can turn on a pivot 54. The end 55 of the guideway component 53 rests against a fixed stop 58 and is held down by a ~pring 56 which is supported on a fixed part 57 of the machine. Since the component 53 can spring inwardly, the severed strip part 38 is prevented from locking on to the guideway assembly 52-53.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for bending flat strip to a cylindrical shape, use being made of a rolling mill comprising at least three rolls, implemented by rolling the strip part to a cylindrical shape over a length, measured in peripheral direction, which is greater than the circumference of the cylinder, the bent strip part being elastically deflected outwards during rolling, a portion then being separated from the bent strip the length of which is exactly equal to the circumference of the desired cylinder, so that a true cylindrical shape is formed after the elastic recovery of the separated deflected portion.
2. A bending machine for bending flat strip to a cylindrical shape by means of a rolling mill comprising at least three rolls and an element which elastically deflects the rounded strip end in a direction which causes the radius of curvature of the rounded strip part to become greater than the radius of curvature which this strip part has in the released state, characterized in that means are provided for separating from the strip which is being fed a bent strip portion having a length equal to the circumference of the desired cylinder.
3. Bending machine according to claim 2, characterized in that a sawing machine is provided allowing a translating motion of sawing machine and bent strip to be performed with respect to each other transversely to the bent strip.
4. Bending machine according to claim 2, characterized in that the rolling mill is housed in a support which is slidably mounted on the machine in the direction of feed of the strip.
5. Bending machine according to claim 2, characterized in that the element is designed as a curved, substantially half-moon guideway which is located inside the bent strip part and which partially encircles one of the rolls, one end of the guideway being provided near the roll surface and the other end being at the required distance from the roll surface.
6. Bending machine according to claim 5, characterized in that the guideway comprises at least two guideway components, one guideway component of which occupies a fixed position with respect to the roll which is located inside it, the other guideway component being capable of performing a swivelling movement, so that the remote end of the guideway can move toward and away from the roll surface.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7510648A NL7510648A (en) | 1975-09-10 | 1975-09-10 | METHOD RESP. BENDING BENCH SUITABLE FOR BENDING FLAT STRIP TO A CYLINDRICAL SHAPE. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1056707A true CA1056707A (en) | 1979-06-19 |
Family
ID=19824448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA260,848A Expired CA1056707A (en) | 1975-09-10 | 1976-09-09 | Method and machine for bending flat strip to a cylindrical shape |
Country Status (8)
| Country | Link |
|---|---|
| AU (1) | AU504858B2 (en) |
| CA (1) | CA1056707A (en) |
| DE (1) | DE2640800A1 (en) |
| FR (1) | FR2323464A1 (en) |
| GB (1) | GB1551984A (en) |
| IN (1) | IN148251B (en) |
| NL (1) | NL7510648A (en) |
| SE (1) | SE427806B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH681514A5 (en) * | 1990-09-28 | 1993-04-15 | Strub Ag | |
| DE102010004725B3 (en) * | 2010-01-15 | 2011-06-09 | Mario Köhler | Bending fixture for use in sheet and metal producing industry, has slot provided in operating connection with contact point of workpiece with tool and contact point of bending roll with workpiece, where offset is provided between points |
| CN109091224B (en) * | 2018-09-21 | 2020-05-05 | 李坤 | Kirschner wire propeller with cladding type bending function for orthopedic surgery |
| CN118204405B (en) * | 2024-05-21 | 2024-07-26 | 青州市虎王工程机械有限公司 | Arc surface bending device for loader oil tank |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1073425B (en) * | 1960-01-21 | Ste des Forges et Ateliers du Creusot, Paris | Four roll sheet metal bending machine | |
| DE471414C (en) * | 1927-12-13 | 1929-02-13 | Walter Weihe | Bending machine on which flat and profiled material can be bent into tubes or rings in one operation |
| US2202555A (en) * | 1939-01-09 | 1940-05-28 | Mckay Machine Co | Unloading mechanism |
| US2387688A (en) * | 1943-03-12 | 1945-10-23 | William F Spahr | Body roller |
| DE906443C (en) * | 1944-10-29 | 1954-03-15 | Eisenwerk Rothe Erde G M B H | Auxiliary device for pre-bending the edge strips of flat steel sheets to be bent by means of a three-roll bending machine, in particular in a ring shape |
| GB637809A (en) * | 1947-04-23 | 1950-05-24 | Glacier Co Ltd | Improvements in the manufacture of part-cylindrical objects from sheet or strip material |
| FR1012200A (en) * | 1949-06-30 | 1952-07-07 | Glacier Co Ltd | Method of manufacturing partially cylindrical articles from sheets or strips of material |
| AT252011B (en) * | 1964-05-06 | 1967-02-10 | Frei Automatic H I Frei | Feed device, in particular for machine tools |
| GB1112088A (en) * | 1966-11-23 | 1968-05-01 | Samme Valentin Lindmark | Improvements in sheet bending machines |
-
1975
- 1975-09-10 NL NL7510648A patent/NL7510648A/en active Search and Examination
-
1976
- 1976-08-17 IN IN1497/CAL/76A patent/IN148251B/en unknown
- 1976-08-31 AU AU17321/76A patent/AU504858B2/en not_active Expired
- 1976-09-08 FR FR7627013A patent/FR2323464A1/en active Granted
- 1976-09-09 CA CA260,848A patent/CA1056707A/en not_active Expired
- 1976-09-09 GB GB37424/76A patent/GB1551984A/en not_active Expired
- 1976-09-10 DE DE19762640800 patent/DE2640800A1/en active Granted
- 1976-09-10 SE SE7610066A patent/SE427806B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE2640800C2 (en) | 1990-09-20 |
| IN148251B (en) | 1980-12-20 |
| DE2640800A1 (en) | 1977-03-24 |
| SE427806B (en) | 1983-05-09 |
| FR2323464B1 (en) | 1982-10-01 |
| FR2323464A1 (en) | 1977-04-08 |
| AU504858B2 (en) | 1979-11-01 |
| SE7610066L (en) | 1977-03-11 |
| AU1732176A (en) | 1978-03-09 |
| GB1551984A (en) | 1979-09-05 |
| NL7510648A (en) | 1977-03-14 |
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