CA2007577A1 - Process and machine for the forming of metal tubes into conical or tapered bodies - Google Patents
Process and machine for the forming of metal tubes into conical or tapered bodiesInfo
- Publication number
- CA2007577A1 CA2007577A1 CA 2007577 CA2007577A CA2007577A1 CA 2007577 A1 CA2007577 A1 CA 2007577A1 CA 2007577 CA2007577 CA 2007577 CA 2007577 A CA2007577 A CA 2007577A CA 2007577 A1 CA2007577 A1 CA 2007577A1
- Authority
- CA
- Canada
- Prior art keywords
- blank
- rolls
- cross
- machine
- drive
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/02—Dies; Selection of material therefor; Cleaning thereof
- B21C3/08—Dies; Selection of material therefor; Cleaning thereof with section defined by rollers, balls, or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/16—Making tubes with varying diameter in longitudinal direction
- B21C37/18—Making tubes with varying diameter in longitudinal direction conical tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/24—Automatic variation of thickness according to a predetermined programme
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Forging (AREA)
Abstract
ABSTRACT
The invention is concerned with a process and a machine for the forming of metal tubes into conically shaped or tapered bodies. In this process the metal tube blank is worked by a pair of rolls (2, 3) engaging and rolling the tube exterior, each of said rolls exhibiting on their working surface (4) a groove of a cross section corres-ponding to half the cross-sectional shapes of the tube blank, said groove being tapered in the circumferential direction. During rotation of the rolls (2, 3), the blank is drawn by means of a grip tong (6) through the deforma-tion cross section between the rolls which forms a die.
Between individual drawing operations, the blank is ro-tated by the grip tong (6).
Figure 1
The invention is concerned with a process and a machine for the forming of metal tubes into conically shaped or tapered bodies. In this process the metal tube blank is worked by a pair of rolls (2, 3) engaging and rolling the tube exterior, each of said rolls exhibiting on their working surface (4) a groove of a cross section corres-ponding to half the cross-sectional shapes of the tube blank, said groove being tapered in the circumferential direction. During rotation of the rolls (2, 3), the blank is drawn by means of a grip tong (6) through the deforma-tion cross section between the rolls which forms a die.
Between individual drawing operations, the blank is ro-tated by the grip tong (6).
Figure 1
Description
2~
Peter WEICHH~RT, La~dertsham lO, Austria Process and machine for the forming of metal tubes into conical or tapered bodies _________________________ _______________________________ The invention concerns a process for the working of metal tubes into conical or tapered bodies, in which the metal tube blank is worked by a pair of rolls engaging and rolling the tube exterior, each of said rolls exhibit-15 ing on their working surface a groove of a cross section corresponding to half the cross-sectional shape of the tube blank, said groove being tapered in the circumfe-rential direction. Furthermore, the invention concerns a machine for performing this process.
Metal tubes with, for example, a circular cross section are formed into conical bodies while at the same time un-dergoing elongation, particularly for use as masts, lamp poles, flag poles and similar.
In order to achieve a uniform taper with as round a cross section as possible, it is necessary in the case of the known processes and machines to process exclusively seam-less metal tubes. The manufacture of conical bodies of 30 this type from seamless tubes is usually performed by rolling, whereby the rolls serving as the forming tools have a circumference which is equivalent to the length of the finished conical body following deformation of the seamless tube. Aside from the fact that the necessary use 35 of seamless starting material substantially increases the cost of the product, there is a disadvantage in the case of this known process and the machine necessary to carry it out in that the forming rolls employed in each case are only suitable for a certain length of a finished conical 40 body. Consequently, for each required length of the fi-nished conical body, a different set of rolls has to be used, and this not only means considerable expenditure in 4 0 ?7 terms of cost but also constitutes a time-consuming method of operation as changing the forming rolls takes up a con-siderable amount of time.
5 Forging is another known method for the manufacture of co-nical bodies from metal tubes with a circular cross sec-tion. This method of manufacture, however, requires re-latively high impact forces and comparatively complicated machines which are correspondingly expensive.
The problem upon which the invention is based lies in imp-roving a process such as that mentioned in the introduc-tion so that it can serve for the forming of starting ma-terial which need no longer be exclusively restricted to lS seamless tubes, and, in addition, in facilitating the use of one and the same tool to produce conical or tapered bodies of various lengths and various degrees of taper with uniform cross-sectional shapes, irrespective of whe-ther bodies of circular or polygonal cross section are to 20 be manufactured.
This problem is solved by the invention concerning a process of the type defined at the beginning in that the blank, during rotation of the rolls, is drawn by means of 25 a grip tong through the working cross section which forms a die, and in that the blank is rotated by the grip tong.
Obviously, in the case of the process according to the invention, the operation of drawing the tube through a die is combined with a simultaneous rolling operation, with 30 the blank also being rotated around its longitudinal axis.
This results in a particularly uniform product.
In a preferred embodiment of the invention, the angle of 'aper produced can be controlled by modifying the drawing 35 speed of the grip tong and/or modifying the rotary speed of the rolls. In this way one and the same pair of rolls can be employed to produce a wide range of different pro-ducts, while simultaneous rotation of the blank during drawing also ensures that as round and as uniform a pro-40 duct as possible is produced irrespective of whether thestarting material was a seamless tube or a tube with a joint seam.
75 f Because deformation of the blank normally can only be car-ried out in one continuous operation, while at the same time achieving an optimal finished product, in the case of 5 relatively small angles of taper and medium lengths, working is preferentially performed in several forming stages, whereby the blank is rotated between the indivi-dual forming stages by means of the grip tong. The rolls are also rotated in several discrete steps in accordance 10 with the various stages of the forming operation, whereby the smallest diameter between the grooves is not reached until the last stage.
A further, particularly significant feature of the process 15 according to the invention consists in the fact that the starting material may take the form of blanks with either a circular or a polygonal cross section.
In the case of a machine for performing the above-des-20 cribed process, with a pair of rotationally driven rolls, each of which features on the surface which engages the blank a groove corresponding in cross section to half the cross-sectional shape of the blank, said groove being ta-pered in the circumferential direction of the rolls, and 25 with a grip tong for holding the blank, the problem upon which the invention is based is essentially solved by the fact that grip tong is mounted on a rotary shaft aligned to the longitudinal axis of the blank, a rotary drive is provided for the grip tong, a device is provided in order 30 to generate a relative motion between the rolls and the blank, and the speed of the drive of the device and/or the rolls is variable.
In a preferred embodiment in accordance with the inven-35 tion, the device for generating the relative motion consists of a slide which traverses in the longitudinal direction of the blank, on which slide the grip tong is mounted.
40 In a modified embodiment in accordance with the invention, the device for generating the relative motion consists of 2~ 5', a carriage which traverses in the longitudinal direction of the blank, on which carriage the rolls are mounted.
In particular it is preferred that a positive drawing 5 drive be provided for the slide, as this is ideally suited to performing the operation of drawing the tube through the rolls which together form a die. This may, in the case of a preferred embodiment, in particular be a chain drive, although rack-and-pinion drive is also possible 10 as an alternative.
In particular, the invention may be further developed in that the drive for the rolls is provided by a variable-speed motor with a gear unit.
In particular, it is advantageous that the rotary drive for the grip tong be mounted together with the latter on the slide. It is likewise advantageous to arrange the drive for the rollers on the carriage.
In order to achieve maximum controllability of the rela-tive motions between the blank and the rolls, it is fur-ther advantageous if the drawing drive for the slide or the carriage is infinitely variable.
In a preferred embodiment of the invention, the grooves exhibit a semi-circular cross section. It is advantageous in this connection if the grip tong can be steplessly ro-tated.
For the processing of blanks with a polygonal cross sec-tion, the grooves in a modified embodiment are provided with a polygonal cross section. It is advantageous in this connection if the grip tong rotation is performed in 35 discrete increments which are defined in accordance with the angular relationships of the polygonal cross section of the grooves.
The invention is explained in greater detail in the fol-40 lowing using the example embodiments indicated in the drawings, wherein 7 ~07577 Figure 1 shows a very simplified schematic side . , elevation of a first embodiment of the invention, Figure 2 shows a side elevation corresponding to Figure 1 of a second embodiment of the invention, and Figure 3 shows a partially cut-away view of the forming rolls with their drive.
As shown in the drawings, the machine according to the invention and generally designated as 1 exhibits as its main components a pair of rolls 2, 3 (cf. Fig. 3), of which the working surface 4, which engages with the blank 15 (not shown in the illustration), exhibits in each case a groove 5 of semi-circular cross section running around the circumference of the rolls 2, 3. As is particularly shown in the partially cut-away view of Figure 3, the groove is tapered in the circumferential direction of the 20 rolls 2, 3 so that when the rolls 2, 3 rotate against each other, the result is a conically changing cross section.
In the case of the embodiment of the machine according to 25 the invention shown in Figure 1, provided in a machine frame 20 is a grip tong 6 which holds the non-illustrated blank.
The grip tong 6 is mounted on a rotating shaft 7 which is 30 in alignment with the longitudinal axis of the blank, and a rotary drive is provided for the grip tong as symbolised by the arrow 8 in Figure 1.
When forming of the tubes into conical bodies, the tube 35 employed as the blank is drawn, during rotation of the rolls 2, 3, through the deformation cross section formed between them which operates in a manner similar to that of a die.
40 For the purpose of this drawing operation, provision has been made in the embodiment according to Figure 1 for a Z007S~7 device generally designated 9, by means of which a rela-tive motion can be generated between the rolls 2, 3 and the blank.
5 In the ill-~strated embodiment, the device 9 takes the form of a carriage 12 on which are mounted the rolls 2, 3 with their shafts 21, 22. Also mounted on the carriage 12 is the drive, designated 10, for the rolls.
lQ The drive 10 is preferably a variable-speed motor 14 with a gear unit 15, which permits infinite variability of the rotary speed of the rolls.
The carriage 12 is moved in relation to the grip tong 6 15 by a drawing drive 13 which preferably takes the form of a positive dr ve arrangement such as a chain drive or a rack-and-pinion drive.
In the case of the embodiment shown in Figure 2, in which 20 the same reference numbers have been employed for the same components or components performing the same func-tion, the pair of rolls 2, 3 with their drive 10 are, in contrast to the embodiment shown in Figure 1, fixed on a stationary pedestal 16 which forms a part of the 25 machine frame 20, while the grip tong 6 with its rotary drive 8 is mounted on a slide 11 which moves on guideways 19 when operated by the drawing drive 13.
Figure 3 additionally shows a pair of spur gears 23, 24, 30 by means of which the rolls 2, 3 are rotated in opposite directions to each other.
In order to form a metal tube into a conical body employ-ing the machine according to the invention, the metal tube 35 is inserted through the largest cross section between the opposing rolls 2, 3, and secured in the grip tong. Rota-tion of the rolls 2, 3 accompanied by simultaneous drawing causes the tube to be formed into a conical body, whereby in the case of multi-stage forming, the grip tong is ro-40 tated between the individual forming stages in order toobtain as round and as uniform a drawn product as pos-sible.
9 ~)0'7577 In order to be able to produce a product of high quality, preference is given in the case of large taper angles and long workpieces, to performing the forming process in se-5 veral stages, whereby during each forming stage the rollsare only rotated by a fraction of their total circum-ference. Between the individual forming stages, the grip tong and thus the partially formed blank is rotated in order to achieve as uniform a cross-sectional shape as 10 possible over the full length of the finished product.
Thus, the aperture formed by the grooves 5 does not reach its smallest diameter until the last forming stage.
The drawing operation during rotation of the rolls 2, 3 15 is performed either in accordance with the embodiment shown in Figure 1, by the carriage carrying the rolls 2, 3 being traversed through operation of the drawing drive 13 away from the rotary but stationary grip tong 6, or in accordance with the embodiment shown in Figure 2 by the 20 rotationally driven grip tong 6 on its slide 11 being traversed away from the stationary rolls 2, 3 through operation of the drawing drive 13.
In both cases, the variable traversing speed of the slide 25 11 or the carriage 12 and/or the variable rotary speed of the rolls 2, 3 enables the angle of taper of the finished product to be regulated as required. The rotary motion of the rolls, which combined with the drawing speed deter-mines the angle of taper, is altered by means of a speed 30 control system, preferably electronic, which governs the motor 14.
In any case, a large number of different conical bodies with differing angles of taper can be produced without 35 changing the tools, i.e. the rolls 2, 3. Moreover, by virtue of the rotary motion generated by the grip tong, a product of outstanding uniformity is produced without the need to use seamless tubes as the starting material.
40 Obviously, blanks of any cross section can be processed through the appropriate design of the grooves S in the rolls 2, 3. In the case of round blanks, the grooves are Z()07S77 of semi-circular cross section as in the described embodi-ment. In this case, the grip tong is steplessly or con-tinuously rotatable as there are no angle restrictions.
When processing blanks of polygonal cross section, the 5 grooves exhibit a cross section corresponding to half the polygon of the cross section of the blanks. In this case, the grip tong 6 can be rotated in discrete increments which correspond to the angular relationships prevailing in the blank.
All the features and advantages of the invention arising from the description, the claims and the drawings, in-cluding design details and spatial arrangements, can be regarded as essential to the invention both individually 15 and in any combination.
Peter WEICHH~RT, La~dertsham lO, Austria Process and machine for the forming of metal tubes into conical or tapered bodies _________________________ _______________________________ The invention concerns a process for the working of metal tubes into conical or tapered bodies, in which the metal tube blank is worked by a pair of rolls engaging and rolling the tube exterior, each of said rolls exhibit-15 ing on their working surface a groove of a cross section corresponding to half the cross-sectional shape of the tube blank, said groove being tapered in the circumfe-rential direction. Furthermore, the invention concerns a machine for performing this process.
Metal tubes with, for example, a circular cross section are formed into conical bodies while at the same time un-dergoing elongation, particularly for use as masts, lamp poles, flag poles and similar.
In order to achieve a uniform taper with as round a cross section as possible, it is necessary in the case of the known processes and machines to process exclusively seam-less metal tubes. The manufacture of conical bodies of 30 this type from seamless tubes is usually performed by rolling, whereby the rolls serving as the forming tools have a circumference which is equivalent to the length of the finished conical body following deformation of the seamless tube. Aside from the fact that the necessary use 35 of seamless starting material substantially increases the cost of the product, there is a disadvantage in the case of this known process and the machine necessary to carry it out in that the forming rolls employed in each case are only suitable for a certain length of a finished conical 40 body. Consequently, for each required length of the fi-nished conical body, a different set of rolls has to be used, and this not only means considerable expenditure in 4 0 ?7 terms of cost but also constitutes a time-consuming method of operation as changing the forming rolls takes up a con-siderable amount of time.
5 Forging is another known method for the manufacture of co-nical bodies from metal tubes with a circular cross sec-tion. This method of manufacture, however, requires re-latively high impact forces and comparatively complicated machines which are correspondingly expensive.
The problem upon which the invention is based lies in imp-roving a process such as that mentioned in the introduc-tion so that it can serve for the forming of starting ma-terial which need no longer be exclusively restricted to lS seamless tubes, and, in addition, in facilitating the use of one and the same tool to produce conical or tapered bodies of various lengths and various degrees of taper with uniform cross-sectional shapes, irrespective of whe-ther bodies of circular or polygonal cross section are to 20 be manufactured.
This problem is solved by the invention concerning a process of the type defined at the beginning in that the blank, during rotation of the rolls, is drawn by means of 25 a grip tong through the working cross section which forms a die, and in that the blank is rotated by the grip tong.
Obviously, in the case of the process according to the invention, the operation of drawing the tube through a die is combined with a simultaneous rolling operation, with 30 the blank also being rotated around its longitudinal axis.
This results in a particularly uniform product.
In a preferred embodiment of the invention, the angle of 'aper produced can be controlled by modifying the drawing 35 speed of the grip tong and/or modifying the rotary speed of the rolls. In this way one and the same pair of rolls can be employed to produce a wide range of different pro-ducts, while simultaneous rotation of the blank during drawing also ensures that as round and as uniform a pro-40 duct as possible is produced irrespective of whether thestarting material was a seamless tube or a tube with a joint seam.
75 f Because deformation of the blank normally can only be car-ried out in one continuous operation, while at the same time achieving an optimal finished product, in the case of 5 relatively small angles of taper and medium lengths, working is preferentially performed in several forming stages, whereby the blank is rotated between the indivi-dual forming stages by means of the grip tong. The rolls are also rotated in several discrete steps in accordance 10 with the various stages of the forming operation, whereby the smallest diameter between the grooves is not reached until the last stage.
A further, particularly significant feature of the process 15 according to the invention consists in the fact that the starting material may take the form of blanks with either a circular or a polygonal cross section.
In the case of a machine for performing the above-des-20 cribed process, with a pair of rotationally driven rolls, each of which features on the surface which engages the blank a groove corresponding in cross section to half the cross-sectional shape of the blank, said groove being ta-pered in the circumferential direction of the rolls, and 25 with a grip tong for holding the blank, the problem upon which the invention is based is essentially solved by the fact that grip tong is mounted on a rotary shaft aligned to the longitudinal axis of the blank, a rotary drive is provided for the grip tong, a device is provided in order 30 to generate a relative motion between the rolls and the blank, and the speed of the drive of the device and/or the rolls is variable.
In a preferred embodiment in accordance with the inven-35 tion, the device for generating the relative motion consists of a slide which traverses in the longitudinal direction of the blank, on which slide the grip tong is mounted.
40 In a modified embodiment in accordance with the invention, the device for generating the relative motion consists of 2~ 5', a carriage which traverses in the longitudinal direction of the blank, on which carriage the rolls are mounted.
In particular it is preferred that a positive drawing 5 drive be provided for the slide, as this is ideally suited to performing the operation of drawing the tube through the rolls which together form a die. This may, in the case of a preferred embodiment, in particular be a chain drive, although rack-and-pinion drive is also possible 10 as an alternative.
In particular, the invention may be further developed in that the drive for the rolls is provided by a variable-speed motor with a gear unit.
In particular, it is advantageous that the rotary drive for the grip tong be mounted together with the latter on the slide. It is likewise advantageous to arrange the drive for the rollers on the carriage.
In order to achieve maximum controllability of the rela-tive motions between the blank and the rolls, it is fur-ther advantageous if the drawing drive for the slide or the carriage is infinitely variable.
In a preferred embodiment of the invention, the grooves exhibit a semi-circular cross section. It is advantageous in this connection if the grip tong can be steplessly ro-tated.
For the processing of blanks with a polygonal cross sec-tion, the grooves in a modified embodiment are provided with a polygonal cross section. It is advantageous in this connection if the grip tong rotation is performed in 35 discrete increments which are defined in accordance with the angular relationships of the polygonal cross section of the grooves.
The invention is explained in greater detail in the fol-40 lowing using the example embodiments indicated in the drawings, wherein 7 ~07577 Figure 1 shows a very simplified schematic side . , elevation of a first embodiment of the invention, Figure 2 shows a side elevation corresponding to Figure 1 of a second embodiment of the invention, and Figure 3 shows a partially cut-away view of the forming rolls with their drive.
As shown in the drawings, the machine according to the invention and generally designated as 1 exhibits as its main components a pair of rolls 2, 3 (cf. Fig. 3), of which the working surface 4, which engages with the blank 15 (not shown in the illustration), exhibits in each case a groove 5 of semi-circular cross section running around the circumference of the rolls 2, 3. As is particularly shown in the partially cut-away view of Figure 3, the groove is tapered in the circumferential direction of the 20 rolls 2, 3 so that when the rolls 2, 3 rotate against each other, the result is a conically changing cross section.
In the case of the embodiment of the machine according to 25 the invention shown in Figure 1, provided in a machine frame 20 is a grip tong 6 which holds the non-illustrated blank.
The grip tong 6 is mounted on a rotating shaft 7 which is 30 in alignment with the longitudinal axis of the blank, and a rotary drive is provided for the grip tong as symbolised by the arrow 8 in Figure 1.
When forming of the tubes into conical bodies, the tube 35 employed as the blank is drawn, during rotation of the rolls 2, 3, through the deformation cross section formed between them which operates in a manner similar to that of a die.
40 For the purpose of this drawing operation, provision has been made in the embodiment according to Figure 1 for a Z007S~7 device generally designated 9, by means of which a rela-tive motion can be generated between the rolls 2, 3 and the blank.
5 In the ill-~strated embodiment, the device 9 takes the form of a carriage 12 on which are mounted the rolls 2, 3 with their shafts 21, 22. Also mounted on the carriage 12 is the drive, designated 10, for the rolls.
lQ The drive 10 is preferably a variable-speed motor 14 with a gear unit 15, which permits infinite variability of the rotary speed of the rolls.
The carriage 12 is moved in relation to the grip tong 6 15 by a drawing drive 13 which preferably takes the form of a positive dr ve arrangement such as a chain drive or a rack-and-pinion drive.
In the case of the embodiment shown in Figure 2, in which 20 the same reference numbers have been employed for the same components or components performing the same func-tion, the pair of rolls 2, 3 with their drive 10 are, in contrast to the embodiment shown in Figure 1, fixed on a stationary pedestal 16 which forms a part of the 25 machine frame 20, while the grip tong 6 with its rotary drive 8 is mounted on a slide 11 which moves on guideways 19 when operated by the drawing drive 13.
Figure 3 additionally shows a pair of spur gears 23, 24, 30 by means of which the rolls 2, 3 are rotated in opposite directions to each other.
In order to form a metal tube into a conical body employ-ing the machine according to the invention, the metal tube 35 is inserted through the largest cross section between the opposing rolls 2, 3, and secured in the grip tong. Rota-tion of the rolls 2, 3 accompanied by simultaneous drawing causes the tube to be formed into a conical body, whereby in the case of multi-stage forming, the grip tong is ro-40 tated between the individual forming stages in order toobtain as round and as uniform a drawn product as pos-sible.
9 ~)0'7577 In order to be able to produce a product of high quality, preference is given in the case of large taper angles and long workpieces, to performing the forming process in se-5 veral stages, whereby during each forming stage the rollsare only rotated by a fraction of their total circum-ference. Between the individual forming stages, the grip tong and thus the partially formed blank is rotated in order to achieve as uniform a cross-sectional shape as 10 possible over the full length of the finished product.
Thus, the aperture formed by the grooves 5 does not reach its smallest diameter until the last forming stage.
The drawing operation during rotation of the rolls 2, 3 15 is performed either in accordance with the embodiment shown in Figure 1, by the carriage carrying the rolls 2, 3 being traversed through operation of the drawing drive 13 away from the rotary but stationary grip tong 6, or in accordance with the embodiment shown in Figure 2 by the 20 rotationally driven grip tong 6 on its slide 11 being traversed away from the stationary rolls 2, 3 through operation of the drawing drive 13.
In both cases, the variable traversing speed of the slide 25 11 or the carriage 12 and/or the variable rotary speed of the rolls 2, 3 enables the angle of taper of the finished product to be regulated as required. The rotary motion of the rolls, which combined with the drawing speed deter-mines the angle of taper, is altered by means of a speed 30 control system, preferably electronic, which governs the motor 14.
In any case, a large number of different conical bodies with differing angles of taper can be produced without 35 changing the tools, i.e. the rolls 2, 3. Moreover, by virtue of the rotary motion generated by the grip tong, a product of outstanding uniformity is produced without the need to use seamless tubes as the starting material.
40 Obviously, blanks of any cross section can be processed through the appropriate design of the grooves S in the rolls 2, 3. In the case of round blanks, the grooves are Z()07S77 of semi-circular cross section as in the described embodi-ment. In this case, the grip tong is steplessly or con-tinuously rotatable as there are no angle restrictions.
When processing blanks of polygonal cross section, the 5 grooves exhibit a cross section corresponding to half the polygon of the cross section of the blanks. In this case, the grip tong 6 can be rotated in discrete increments which correspond to the angular relationships prevailing in the blank.
All the features and advantages of the invention arising from the description, the claims and the drawings, in-cluding design details and spatial arrangements, can be regarded as essential to the invention both individually 15 and in any combination.
Claims (10)
1. A process for the forming of metal tubes into conic-ally shaped bodies, in which the metal tube blank is worked by a pair of rolls engaging and rolling the tube exterior, each of said rolls exhibiting on their working surface a groove of a cross section corresponding to half the cross-sectional shapes of the tube blank, said groove being tapered in the circumferential direction, w h e r e-i n the blank, during rotation of the rolls, is drawn by means of a grip tong through the working cross section which forms a die, and the blank is rotated by the grip tong.
2. A process as claimed in claim 1, wherein the degree of taper produced can be controlled by modifying the draw-ing speed of the grip tong and/or by modifying the rotary speed of the rolls, the forming work is carried out in several deformation stages, the blank is rotated between the deformation stages by means of the grip tong, and the initial blank is of circular or polygonal cross section.
3. A machine for performing the process as claimed in claim 1 or 2, with a pair of rotationally driven rolls, each of which features on the surface which engages the blank a groove corresponding in cross section to half the cross-sectional shape of the blank, said groove being tapered in the circumferential direction of the rolls, and with a grip tong for holding the blank, wherein the grip tong (6) is mounted on a rotary shaft (7) aligned to the longitudinal axis of the blank, a rotary drive (8) is provided for the grip tong (6), a device (9) is provided in order to generate a relative motion between the rolls (2, 3) and the blank, and the speed of the drive (13, 10) of the device (9) and/or the rolls (2, 3) is variable.
4. A machine as claimed in claim 3, wherein the device (9) for generating the relative motion consists of a slide (11) which traverses in the longitudinal direction of the blank, on which slide the grip tong (6) is mounted.
5. A machine as claimed in claim 3 wherein the device (9) for generating the relative motion consists of a car-riage (12) which traverses in the longitudinal direction of the blank, on which carriage the rolls (2, 3) are mounted.
6. A machine as claimed in claim 4 or 5, wherein a posi-tive drawing drive (13) is provided for the slide (11) and/or the carriage (12), the drawing drive (8) is mounted on the slide (11), and the drive (10, 14, 15) is mounted on the carriage (12).
7. A machine as claimed in claim 6, wherein the drawing drive (13) takes the form of a chain drive or a rack-and-pinion drive.
8. A machine as claimed in claim 3, wherein the drive (10) for the rolls (2, 3) takes the form of a variable-speed motor (14) with a gear unit (15).
9. A machine as claimed in one of the claims 3 through 8, wherein the grooves (5) feature a semi-circular cross section, and the grip tong (6) can be steplessly rotated.
10. A machine as claimed in one of the claims 3 through 8, wherein the grooves (5) are of polygonal cross section, and the grip tong (6) is rotationally driven in discrete increments which are determined in accordance with the an-gular relationships of the polygonal cross section of the grooves (5).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19893903132 DE3903132A1 (en) | 1989-02-02 | 1989-02-02 | METHOD AND DEVICE FOR DEFORMING METAL TUBES TO TAPERED OR TAPERED BODIES |
| DEP3903132.2 | 1989-02-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2007577A1 true CA2007577A1 (en) | 1990-08-02 |
Family
ID=6373318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2007577 Abandoned CA2007577A1 (en) | 1989-02-02 | 1990-01-11 | Process and machine for the forming of metal tubes into conical or tapered bodies |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0381116A3 (en) |
| JP (1) | JPH0649201B2 (en) |
| CA (1) | CA2007577A1 (en) |
| DE (1) | DE3903132A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4421683A1 (en) * | 1994-06-24 | 1996-01-04 | Contipole Aluminium Gmbh | Method and device for deforming metal pipes into conical or tapered bodies |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB387485A (en) * | 1932-01-05 | 1933-02-09 | Tom Oldfield | Improvements in and relating to machines for spinning or converting cylindrical metal tubes into taper or irregular shaped tubes |
| FR1168207A (en) * | 1956-12-18 | 1958-12-05 | Tube taper machine | |
| DE1123643B (en) * | 1957-10-25 | 1962-02-15 | Demag Ag | Process and system for the production of hollow bodies with a diameter that changes along the axis |
| US3019678A (en) * | 1958-07-21 | 1962-02-06 | Fiell Cecil K Le | Tube tapering machine |
| US3274816A (en) * | 1963-09-20 | 1966-09-27 | Held Richard Anthony | Machine for tapering tubing |
| US3483728A (en) * | 1966-01-31 | 1969-12-16 | Dalmine Spa | Process and device for drawing truncated-cone shaped bodies and the like |
| JP2615095B2 (en) * | 1987-12-01 | 1997-05-28 | 三菱重工業株式会社 | Control valve control method |
| JP2649934B2 (en) * | 1988-02-23 | 1997-09-03 | カヤバ工業株式会社 | Control device for proportional solenoid valve |
| JPH01229180A (en) * | 1988-03-07 | 1989-09-12 | Nissan Motor Co Ltd | Driving circuit for electromagnetic hydraulic control valve |
| JP2579207B2 (en) * | 1988-12-28 | 1997-02-05 | 株式会社いすゞセラミックス研究所 | Valve stepping drive |
-
1989
- 1989-02-02 DE DE19893903132 patent/DE3903132A1/en not_active Withdrawn
-
1990
- 1990-01-11 CA CA 2007577 patent/CA2007577A1/en not_active Abandoned
- 1990-01-29 EP EP19900101726 patent/EP0381116A3/en not_active Withdrawn
- 1990-02-01 JP JP2055090A patent/JPH0649201B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0381116A3 (en) | 1991-05-08 |
| JPH0649201B2 (en) | 1994-06-29 |
| DE3903132A1 (en) | 1990-08-09 |
| EP0381116A2 (en) | 1990-08-08 |
| JPH02235506A (en) | 1990-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |