CA2220097A1 - Method and device for rounding bushings - Google Patents
Method and device for rounding bushings Download PDFInfo
- Publication number
- CA2220097A1 CA2220097A1 CA002220097A CA2220097A CA2220097A1 CA 2220097 A1 CA2220097 A1 CA 2220097A1 CA 002220097 A CA002220097 A CA 002220097A CA 2220097 A CA2220097 A CA 2220097A CA 2220097 A1 CA2220097 A1 CA 2220097A1
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- Canada
- Prior art keywords
- shaping
- bushing
- core
- chamber
- die
- 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
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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
- B21D53/00—Making other particular articles
- B21D53/10—Making other particular articles parts of bearings; sleeves; valve seats or the like
-
- 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
- B21D51/00—Making hollow objects
- B21D51/02—Making hollow objects characterised by the structure of the objects
- B21D51/10—Making hollow objects characterised by the structure of the objects conically or cylindrically shaped objects
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Forging (AREA)
- Closures For Containers (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
The invention concerns a rounding device (10) comprising two shaping dies (12, 14) with shaping chambers (22, 24) in order to round a sheet bar (26) about a core (16). The peripheral lengths of the two shaping chambers (22, 24) are each longer than half the can length. During a shaping step, the core (16) penetrates a first shaping chamber (22) by a depth which is greater than the can radius. The sheet bar (26) is thus shaped in the form of a U. In an intermediate shaping stage, an auxiliary core (18) is placed on the core (16) such that, as the second shaping die (14) moves downwards, only the ends of the U-legs of the sheet bar blank (26) are shaped arcuately. When the auxiliary core (18) and part (20) of the first shaping die (12) have been removed, the final can shaping process occurs, in which the second shaping die (14) likewise travels over the centre of the can. The three-stage rounding method enables cans to be rounded highly accurately and carefully.
Description
':
METHOD AND DEVICE FOR ROUNDING BUSHINGS
. .
3 DESCRIPTION .
The invention relates to a method for rounding bushings wherein a sheet 6 bar is inserted into a clearance between a core and a first shaping die ~aving a :
7 first shaping chamber with an inner profile which at least approximately 8 complements the outer profile of the bushing and which extends over at least 9 half of the circumference of the bushing, such that during a pre-shaping step :;
10 when the core moves relative to and penetrates the first shaping chamber, the 11 sheet bar is bent approximately in the form of a U, that the core which is now 12 positioned in the first shaping chamber subsequently moves relative to and :
13 pene~r~tes a second shaping chamber of a second shaping die whereby the two 14 legs of the U-shaped formed body undergo a final shaping step to assume the 15 shape of a bushing, that the edges of each shaping chamber of each shaping 16 die terminate on face planes on the shaping dies which are parallel to each 17 other, and that these face planes at least approximately contact each other when 18 the two shaping chambers are closed.
Such a method is known in the art and used to bend most round 21 housings, bush~l igs and bearing slecvcs from pre-stamped sheet bars; however, 22 the flnal shaping step turns out to be unsatisfactory, mainly because rounding is inco,nplete in the vicinity of the face planes of the shaping dies. Irregularities are 2 also observed at the bushing ends. In most cases, it is therefore necess~ry to 3 finish the bushings thereafter by a sizing process. It is also impossible to avoid 4 polishing marks on the bushing surfaces with the known methods and expensive 5 materials, for example materials having multiple layers, plastic-coated sheet bars 6 and the like, cannot be processed by this method without introducing surface 7 damage.
9 It is the object of the invention to provide a method for rounding the sheet bars more accurately and gentler than with the known methods, making it 11 possible to process more delicate materials, and a device for carrying out the 1 2 method.
14 In most applications, rounding refers to the shaping of rotationally symmetrical parts, such as cylindrical or conical bushings, but is not restricted to 16 such shapes alone. The shaped components may also have oval, elliptical, tear-17 shaped or similar cross-sections.
19 The aforementioned inventive method provides a solution for this problem by having the core penetrate the first shaping chamber by a depth which is 21 greater than the bushing radius, so that the bushing axis in relation to the face plane of the first shaping die is located inside the first shaping cl ,amber after the 2 pre-shaping of the bushing is completed.
4 In a further improvement of the invention, the core penel,ales the second shaping chamber by a depth which is greater than the bushing radius, so that 6 the bushing axis in relation to the face plane of the second shaping die is7 located inside the second shaping chamber after the final shaping of the 8 bushing.
Since the face planes of preferably both shaping dies are located above 11 the bushing center, the bushing is significantly better rounded in the 90~ region 12 and in the 270~ region than was possible with the known bending methods 13 where the shaping dies consistently only move to the center plane of the 14 bushing. This method can only be implemented if the cross-section of the core, preferably however and in addition also the cross-section of the first shaping die, 16 is changed between the pre-shaping step and the final shaping step. The device 17 of the present invention which will be described hereinafter, advantageously 18 provides a solution for carrying out this method.
Another significant feature of the invention provides for an auxiliary 21 shaping step t~ occur between the pre-shaping step and the final shaping step, 22 in which auxiliary step, when the core moves relative to and penetrates the second shaping chamber, only the ends of the U-shaped legs of the sheet bar 2 are bent to co"ror", with the curvature of the second shaping chamber, and the 3 section of the U-shaped legs which is located between these ends and the 4 rounded base of the U-shaped sheet bar blank, is not bent. Consequently, thisintermediate shaping step transforms the sheet bar blank into a stretched round 6 profile, thereby facilitating the precise rounding of the bushing ends.
8 Although the inventive method provides the means for very precise 9 rounding the bushings, another embodiment of the invention provides two 10 working areas for processing the bushings, with the pre-shaping step, the 11 intermediate shaping step and the final shaping step assigned to the first 12 working area and the sizing of the bushing performed in the second working 13 area whereto the bushing is moved after the final shaping step by axial 4 displacement.
16 An additional important feature of the invention provides for an enlarged 17 cross-section of the core by axially inserting an auxiliary core before the pre-18 shaping step, thereby enabling at least one of the shaping dies to travel beyond 19 the bushing center. This auxiliary core is advantageously employed after the 20 final shaping step to push the bushing onto an expansion sleeve of the sizing21 station in the second working area.
The invention relates furthermore to a rounding device for carrying out the 2 rounding method, the device characterized in that the core and the first shaping 3 chamber have a larger cross-section during the pre-shaping step than during the 4 final shaping step. This feature can be implemented by interchanging the cores.
5 Another alternate advantageous approach would be to employ an auxiliary core 6 which is temporarily removed during the final shaping step. This auxiliary core is 7 preferably seated on the core with a concave surface and has a convex working 8 surface shaped to complement the shape of the inner surface of the shaping 9 chamber. Consequently, the auxiliary core has a sickle-shaped cross-section, 10 with the working surface and the inner surface positioned on circular cylinders of 11 identical size.
13 The first shaping die preferably supports a slider forming a part of and 14 also the face of the first shaping chamber, the face defining the plane of 15 oscul~tion between the shaping dies during the pre-forming and the intermediate 16 or auxiliary forming steps. This plane of oscul~tion is displaced from the bushing 17 center towards the first shaping die. The auxiliar,v core can now be 18 advantageously combined with the slider into a conjointly movable unit, so that 19 the core and the first shaping chamber are provided with new cross-sectional 20 shapes for final shaping of the bushing after the unit is retracted from the first 21 working area fQr enabling the unchanged second shaping die to travel beyond 22 the bushing center for the final shaping step of the bushing.
Whereas in devices representative for the present state of the art smaller 2 sheet bars are suspended from a support tape centered above a rib, the sheet 3 bars in the method according to the invention are secured to the support tape via 4 two ribs located near the end sections of the sheet bar. Consequently, the sheet 5 bar can be positioned more accurately inside the rounding device. Since these 6 ribs leave shear marks on the bushing face after separation from the support 7 tape, the bushings fabricated with the inventive method or inventive device, as 8 the case may be, are dirrerenliated from the state of the art in that the shear 9 marks are located near the quarter girth proximate to the slot in the bushing.
11 The three-step rounding method wherein the cross-sections of the core 12 and shaping chambers are changed, provides for a careful and very precise 13 rounding of sheet bars, enabling extremely delicate laminated sheet bar 14 structures to be shaped by the inventive method.
16 The width of both shaping dies of the inventive device is at least double 17 the width of the bushing to be rounded and include in the axial direction aside 18 from the shaping chambers at least one sizing chamber, wherein both sizing 19 chal"bers are the mirror image of each other, but are otherwise identical and 20 have the same curvature as the respective shaping chambers; the sizing 21 chambers, however, span only an angle at circumference of 180~. Both sizing 22 chambers form a sizing cavity which is closed at the circumference and co" espGnds to the outer bushing envelope. This sizing cavity includes a 2 spreader device, preferably in the form of a spreader sleeve, adapted for 3 expansion or contraction by means of an interior cone axially movable by an 4 ~ctu~tor rod.
s 6 This advanced feature advantageously allows not only shaping of a 7 bushing with the same tool, but also sizing of the bushing by using the same tool 8 in a second working area, thus obviating the need for repeatedly withdrawing 9 and inserting the sheet bars and bushing blanks and the inaccuracies associated therewith.
12 An embodiment of the invention will be described hereinafter in greater 13 detail with reference to the drawing.
The drawing shows in:
17 FIG. 1 - FIG. 6 The shaping device with the sheet bar to be shaped, 18 showing sl~ccessive operating sequences;
FIG. 7 - FIG. 12 Cross-sectional views of the shaping device during 21 the operali~1g sequences corresponding to the respective views.
The figures schematically depict fixturing parts of a shaping device 10 2 comprising a first shaping die 12, a second shaping die 14, a circular-cylindrical 3 hollow core 16, an auxiliary core 18 and a slider 20 slidably supported on the 4 first shaping die 12 for axial movement parallel to the core 16. The auxiliary 5 core 18 and the slider 20 form a unit which is moved back and forth parallel to 6 the direction of the arrow A (FIG. 10) by an actuator (not shown). The first 7 shaping die 12 includes a shaping chamber 22 formed as a section of a cylinder 8 and having a partly cylindrical bottom. In the region of the slider 20, the partly 9 cylindrical inner surface of the shaping chamber 22 becomes semicylindrical, 10 and terminates with parallel inner surface sections at the face plane 23 of the 11 first shaping die 12.
13 The second shaping die 14 comprises two die halves 14a and 14b 14 conjointly forming a second shaping chamber 24. The second shaping 15 chamber 24 is formed approximately as a mirror image of the shaping 16 chamber 22 and has, aside from a step between the two die halves 14a and 14b, 17 a semicylindrical profile with downwardly pointing parallel inner surface sections 18 depending therer,o",. The die part 14a is supported on the die part 14b for 19 vertical displacement and is resiliently biased by a spring 15 (shown only 20 schematically) against a stop on the die part 14a in such a way that a step 17 is 21 created in the center plane of the shaping chamber 24.
FIG. 1 shows the two shaping dies 12, 14 sp~ced apart. The core 16 is 2 fixedly supported. A sheet bar 26 is inserted into the clearance between the 3 core 16 and the face of the first shaping die 12. The shaping die 12 then moves 4 upwardly in the direction of the arrow as shown in FIG. 1 and bends the sheet 5 bar 26 in the shape of a U, as shown in FIG. 2. The center of the core which 6 coincides with the bushing center, is located below the face 23 of the first 7 shaping die 12. Consequently, the core 16 has penel, aled the shaping 8 chamber 22 by a depth which is greater than the bushing radius. As a result, 9 the 90~ and 270~ points of the bushing to be formed are located inside the 10 shaping chamber 22, thereby preventing the formed U-legs of the sheet bar 26 11 from springing outwardly, but forcing them instead to sit close to the auxiliary 12 core 18. This completes the shaping process of the sheet bar 26.
14 At this point, the second shaping die 14 moves downwardly, as shown in 15 FIG. 3. The ends 26' of the U-legs of the sheet bar blank are bent inwardly upon 16 touching the wall of the shaping chamber 24 and sit close to the auxiliary 17 core 18 when the auxiliary core 18 seats on the shaping die 14. The rectilinearity 18 of the U-legs of the sheet bar blank 26 is preserved in the region of the parallel 19 sections of the chamber surfaces of both shaping dies 12, 14. The step 17 in the 20 shaping chamber 24 c~uses the two leg ends 26' to be bent with a slight time 21 delay. The bending step of the two leg ends 26' between the second shaping 22 die 14 and the auxiliary core 18 represe,)ls an intervening auxiliary shaping step for shaping the leg ends 26' exactiy as a circular cylinder and providing them 2 already with their final shape.
4At this point, the auxiliary core 18 together with the slider 20 is retracted 5between the shaping dies 12, 14 by axial movement along the direction of the 6arrow A (FIG. 10), possibly necessitating a slight lifting of the second shaping 7die 14. Subsequently, the second shaping die 14 moves downwardly once more 8for providing the final shaping step of the bushing. After the slider 20 is pulled 9out of the first shaping die 12, the shaping die 14 can travel to a greater depth, 10beyond the face 23 of the first shaping die 12, to the bottom surface 28 of the 11shaping die 12, with the face 19 of the second shaping die 14 traveling 12downwardly beyond the center of the core, until the inner surface of the shaping 13chamber 24 bends the straight U-leg sections of the bushing blank likewise into 14a circular-cylindrical shape, thereby completing the final shaping of the 15bushing 27.
17The bushing ends are normally interlocked by mutually engaging 18protrusions and cut-outs provided on the bushing ends. Since the die half 14b 19initially presses one of the bushing ends against the core 16, the bushing 27 can 20be seamed and interlocked during the last phase of the downward movement of 21die half 14a. Both dies 12 and 14 subsequently separate (FIG. 5), allowing 22removal of the completed bushing 27 from the core 16.
Figs. 7 to 12 illustrate an additional sizing process of bushing 27 2 pe,rorl"ed in the same device 10 in a second working area. For this purpose, 3 tools are secured to the right side of both shaping dies 12, 14, each tool 4 provided with a sizing chamber 34, 36 having the same curvature as the shaping 5 chambers 22, 24, but spanning only an angle at circu",ference of 180~. When 6 the dies 12, 14 are closed, the plane of osculation of the sizing chambers 34, 36 7 coincides with the center of the core. The hollow core 16 is penetrated by an 8 actuator rod 38 supporting in the second working area a cone 40 surrounded by 9 a spreader sleeve 42.
11 Starting with Figs. 5 and 11, the unit comprising the auxiliary core 18 and 12 the slider 20 moves once more to the first working area after the final shaping of 13 bushing 27 is completed, whereby the auxiliary core 18 pushes the bushing 27 14 which is located on the core 16, over the spreader sleeve 42 in the second 15 working area. The bushing 27 which was sized during the previous processing 16 cycle, is at the same time expelled from the device 10 (FIG. 12). The device 10 17 is now ready to accept a new sheet bar 26 in the first working area. The 18 processing steps of pre-shaping, intermediate shaping and final shaping of the 19 bushing 27 are repeated and the two tools 30, 32 are closed in the position 20 shown in Figs. 4 and 10, forming a cylindrical sizing cavity enclosing the 21 bushing 27. In t-his position, the ~otu~tor rod 38 is pulled in the direction of the arrow A (FIG. 10), ll ,ereby expanding the spreader sleeve 42 through the action 2 of the cone 40 and sizing the bushing 27.
4 Consequently, the device 10 enables - without additional handling tools -very accurate rounding and seaming of a sheet bar 26 in a first working area and6 sizing in a second working area.
METHOD AND DEVICE FOR ROUNDING BUSHINGS
. .
3 DESCRIPTION .
The invention relates to a method for rounding bushings wherein a sheet 6 bar is inserted into a clearance between a core and a first shaping die ~aving a :
7 first shaping chamber with an inner profile which at least approximately 8 complements the outer profile of the bushing and which extends over at least 9 half of the circumference of the bushing, such that during a pre-shaping step :;
10 when the core moves relative to and penetrates the first shaping chamber, the 11 sheet bar is bent approximately in the form of a U, that the core which is now 12 positioned in the first shaping chamber subsequently moves relative to and :
13 pene~r~tes a second shaping chamber of a second shaping die whereby the two 14 legs of the U-shaped formed body undergo a final shaping step to assume the 15 shape of a bushing, that the edges of each shaping chamber of each shaping 16 die terminate on face planes on the shaping dies which are parallel to each 17 other, and that these face planes at least approximately contact each other when 18 the two shaping chambers are closed.
Such a method is known in the art and used to bend most round 21 housings, bush~l igs and bearing slecvcs from pre-stamped sheet bars; however, 22 the flnal shaping step turns out to be unsatisfactory, mainly because rounding is inco,nplete in the vicinity of the face planes of the shaping dies. Irregularities are 2 also observed at the bushing ends. In most cases, it is therefore necess~ry to 3 finish the bushings thereafter by a sizing process. It is also impossible to avoid 4 polishing marks on the bushing surfaces with the known methods and expensive 5 materials, for example materials having multiple layers, plastic-coated sheet bars 6 and the like, cannot be processed by this method without introducing surface 7 damage.
9 It is the object of the invention to provide a method for rounding the sheet bars more accurately and gentler than with the known methods, making it 11 possible to process more delicate materials, and a device for carrying out the 1 2 method.
14 In most applications, rounding refers to the shaping of rotationally symmetrical parts, such as cylindrical or conical bushings, but is not restricted to 16 such shapes alone. The shaped components may also have oval, elliptical, tear-17 shaped or similar cross-sections.
19 The aforementioned inventive method provides a solution for this problem by having the core penetrate the first shaping chamber by a depth which is 21 greater than the bushing radius, so that the bushing axis in relation to the face plane of the first shaping die is located inside the first shaping cl ,amber after the 2 pre-shaping of the bushing is completed.
4 In a further improvement of the invention, the core penel,ales the second shaping chamber by a depth which is greater than the bushing radius, so that 6 the bushing axis in relation to the face plane of the second shaping die is7 located inside the second shaping chamber after the final shaping of the 8 bushing.
Since the face planes of preferably both shaping dies are located above 11 the bushing center, the bushing is significantly better rounded in the 90~ region 12 and in the 270~ region than was possible with the known bending methods 13 where the shaping dies consistently only move to the center plane of the 14 bushing. This method can only be implemented if the cross-section of the core, preferably however and in addition also the cross-section of the first shaping die, 16 is changed between the pre-shaping step and the final shaping step. The device 17 of the present invention which will be described hereinafter, advantageously 18 provides a solution for carrying out this method.
Another significant feature of the invention provides for an auxiliary 21 shaping step t~ occur between the pre-shaping step and the final shaping step, 22 in which auxiliary step, when the core moves relative to and penetrates the second shaping chamber, only the ends of the U-shaped legs of the sheet bar 2 are bent to co"ror", with the curvature of the second shaping chamber, and the 3 section of the U-shaped legs which is located between these ends and the 4 rounded base of the U-shaped sheet bar blank, is not bent. Consequently, thisintermediate shaping step transforms the sheet bar blank into a stretched round 6 profile, thereby facilitating the precise rounding of the bushing ends.
8 Although the inventive method provides the means for very precise 9 rounding the bushings, another embodiment of the invention provides two 10 working areas for processing the bushings, with the pre-shaping step, the 11 intermediate shaping step and the final shaping step assigned to the first 12 working area and the sizing of the bushing performed in the second working 13 area whereto the bushing is moved after the final shaping step by axial 4 displacement.
16 An additional important feature of the invention provides for an enlarged 17 cross-section of the core by axially inserting an auxiliary core before the pre-18 shaping step, thereby enabling at least one of the shaping dies to travel beyond 19 the bushing center. This auxiliary core is advantageously employed after the 20 final shaping step to push the bushing onto an expansion sleeve of the sizing21 station in the second working area.
The invention relates furthermore to a rounding device for carrying out the 2 rounding method, the device characterized in that the core and the first shaping 3 chamber have a larger cross-section during the pre-shaping step than during the 4 final shaping step. This feature can be implemented by interchanging the cores.
5 Another alternate advantageous approach would be to employ an auxiliary core 6 which is temporarily removed during the final shaping step. This auxiliary core is 7 preferably seated on the core with a concave surface and has a convex working 8 surface shaped to complement the shape of the inner surface of the shaping 9 chamber. Consequently, the auxiliary core has a sickle-shaped cross-section, 10 with the working surface and the inner surface positioned on circular cylinders of 11 identical size.
13 The first shaping die preferably supports a slider forming a part of and 14 also the face of the first shaping chamber, the face defining the plane of 15 oscul~tion between the shaping dies during the pre-forming and the intermediate 16 or auxiliary forming steps. This plane of oscul~tion is displaced from the bushing 17 center towards the first shaping die. The auxiliar,v core can now be 18 advantageously combined with the slider into a conjointly movable unit, so that 19 the core and the first shaping chamber are provided with new cross-sectional 20 shapes for final shaping of the bushing after the unit is retracted from the first 21 working area fQr enabling the unchanged second shaping die to travel beyond 22 the bushing center for the final shaping step of the bushing.
Whereas in devices representative for the present state of the art smaller 2 sheet bars are suspended from a support tape centered above a rib, the sheet 3 bars in the method according to the invention are secured to the support tape via 4 two ribs located near the end sections of the sheet bar. Consequently, the sheet 5 bar can be positioned more accurately inside the rounding device. Since these 6 ribs leave shear marks on the bushing face after separation from the support 7 tape, the bushings fabricated with the inventive method or inventive device, as 8 the case may be, are dirrerenliated from the state of the art in that the shear 9 marks are located near the quarter girth proximate to the slot in the bushing.
11 The three-step rounding method wherein the cross-sections of the core 12 and shaping chambers are changed, provides for a careful and very precise 13 rounding of sheet bars, enabling extremely delicate laminated sheet bar 14 structures to be shaped by the inventive method.
16 The width of both shaping dies of the inventive device is at least double 17 the width of the bushing to be rounded and include in the axial direction aside 18 from the shaping chambers at least one sizing chamber, wherein both sizing 19 chal"bers are the mirror image of each other, but are otherwise identical and 20 have the same curvature as the respective shaping chambers; the sizing 21 chambers, however, span only an angle at circumference of 180~. Both sizing 22 chambers form a sizing cavity which is closed at the circumference and co" espGnds to the outer bushing envelope. This sizing cavity includes a 2 spreader device, preferably in the form of a spreader sleeve, adapted for 3 expansion or contraction by means of an interior cone axially movable by an 4 ~ctu~tor rod.
s 6 This advanced feature advantageously allows not only shaping of a 7 bushing with the same tool, but also sizing of the bushing by using the same tool 8 in a second working area, thus obviating the need for repeatedly withdrawing 9 and inserting the sheet bars and bushing blanks and the inaccuracies associated therewith.
12 An embodiment of the invention will be described hereinafter in greater 13 detail with reference to the drawing.
The drawing shows in:
17 FIG. 1 - FIG. 6 The shaping device with the sheet bar to be shaped, 18 showing sl~ccessive operating sequences;
FIG. 7 - FIG. 12 Cross-sectional views of the shaping device during 21 the operali~1g sequences corresponding to the respective views.
The figures schematically depict fixturing parts of a shaping device 10 2 comprising a first shaping die 12, a second shaping die 14, a circular-cylindrical 3 hollow core 16, an auxiliary core 18 and a slider 20 slidably supported on the 4 first shaping die 12 for axial movement parallel to the core 16. The auxiliary 5 core 18 and the slider 20 form a unit which is moved back and forth parallel to 6 the direction of the arrow A (FIG. 10) by an actuator (not shown). The first 7 shaping die 12 includes a shaping chamber 22 formed as a section of a cylinder 8 and having a partly cylindrical bottom. In the region of the slider 20, the partly 9 cylindrical inner surface of the shaping chamber 22 becomes semicylindrical, 10 and terminates with parallel inner surface sections at the face plane 23 of the 11 first shaping die 12.
13 The second shaping die 14 comprises two die halves 14a and 14b 14 conjointly forming a second shaping chamber 24. The second shaping 15 chamber 24 is formed approximately as a mirror image of the shaping 16 chamber 22 and has, aside from a step between the two die halves 14a and 14b, 17 a semicylindrical profile with downwardly pointing parallel inner surface sections 18 depending therer,o",. The die part 14a is supported on the die part 14b for 19 vertical displacement and is resiliently biased by a spring 15 (shown only 20 schematically) against a stop on the die part 14a in such a way that a step 17 is 21 created in the center plane of the shaping chamber 24.
FIG. 1 shows the two shaping dies 12, 14 sp~ced apart. The core 16 is 2 fixedly supported. A sheet bar 26 is inserted into the clearance between the 3 core 16 and the face of the first shaping die 12. The shaping die 12 then moves 4 upwardly in the direction of the arrow as shown in FIG. 1 and bends the sheet 5 bar 26 in the shape of a U, as shown in FIG. 2. The center of the core which 6 coincides with the bushing center, is located below the face 23 of the first 7 shaping die 12. Consequently, the core 16 has penel, aled the shaping 8 chamber 22 by a depth which is greater than the bushing radius. As a result, 9 the 90~ and 270~ points of the bushing to be formed are located inside the 10 shaping chamber 22, thereby preventing the formed U-legs of the sheet bar 26 11 from springing outwardly, but forcing them instead to sit close to the auxiliary 12 core 18. This completes the shaping process of the sheet bar 26.
14 At this point, the second shaping die 14 moves downwardly, as shown in 15 FIG. 3. The ends 26' of the U-legs of the sheet bar blank are bent inwardly upon 16 touching the wall of the shaping chamber 24 and sit close to the auxiliary 17 core 18 when the auxiliary core 18 seats on the shaping die 14. The rectilinearity 18 of the U-legs of the sheet bar blank 26 is preserved in the region of the parallel 19 sections of the chamber surfaces of both shaping dies 12, 14. The step 17 in the 20 shaping chamber 24 c~uses the two leg ends 26' to be bent with a slight time 21 delay. The bending step of the two leg ends 26' between the second shaping 22 die 14 and the auxiliary core 18 represe,)ls an intervening auxiliary shaping step for shaping the leg ends 26' exactiy as a circular cylinder and providing them 2 already with their final shape.
4At this point, the auxiliary core 18 together with the slider 20 is retracted 5between the shaping dies 12, 14 by axial movement along the direction of the 6arrow A (FIG. 10), possibly necessitating a slight lifting of the second shaping 7die 14. Subsequently, the second shaping die 14 moves downwardly once more 8for providing the final shaping step of the bushing. After the slider 20 is pulled 9out of the first shaping die 12, the shaping die 14 can travel to a greater depth, 10beyond the face 23 of the first shaping die 12, to the bottom surface 28 of the 11shaping die 12, with the face 19 of the second shaping die 14 traveling 12downwardly beyond the center of the core, until the inner surface of the shaping 13chamber 24 bends the straight U-leg sections of the bushing blank likewise into 14a circular-cylindrical shape, thereby completing the final shaping of the 15bushing 27.
17The bushing ends are normally interlocked by mutually engaging 18protrusions and cut-outs provided on the bushing ends. Since the die half 14b 19initially presses one of the bushing ends against the core 16, the bushing 27 can 20be seamed and interlocked during the last phase of the downward movement of 21die half 14a. Both dies 12 and 14 subsequently separate (FIG. 5), allowing 22removal of the completed bushing 27 from the core 16.
Figs. 7 to 12 illustrate an additional sizing process of bushing 27 2 pe,rorl"ed in the same device 10 in a second working area. For this purpose, 3 tools are secured to the right side of both shaping dies 12, 14, each tool 4 provided with a sizing chamber 34, 36 having the same curvature as the shaping 5 chambers 22, 24, but spanning only an angle at circu",ference of 180~. When 6 the dies 12, 14 are closed, the plane of osculation of the sizing chambers 34, 36 7 coincides with the center of the core. The hollow core 16 is penetrated by an 8 actuator rod 38 supporting in the second working area a cone 40 surrounded by 9 a spreader sleeve 42.
11 Starting with Figs. 5 and 11, the unit comprising the auxiliary core 18 and 12 the slider 20 moves once more to the first working area after the final shaping of 13 bushing 27 is completed, whereby the auxiliary core 18 pushes the bushing 27 14 which is located on the core 16, over the spreader sleeve 42 in the second 15 working area. The bushing 27 which was sized during the previous processing 16 cycle, is at the same time expelled from the device 10 (FIG. 12). The device 10 17 is now ready to accept a new sheet bar 26 in the first working area. The 18 processing steps of pre-shaping, intermediate shaping and final shaping of the 19 bushing 27 are repeated and the two tools 30, 32 are closed in the position 20 shown in Figs. 4 and 10, forming a cylindrical sizing cavity enclosing the 21 bushing 27. In t-his position, the ~otu~tor rod 38 is pulled in the direction of the arrow A (FIG. 10), ll ,ereby expanding the spreader sleeve 42 through the action 2 of the cone 40 and sizing the bushing 27.
4 Consequently, the device 10 enables - without additional handling tools -very accurate rounding and seaming of a sheet bar 26 in a first working area and6 sizing in a second working area.
Claims (14)
1. A method for rounding bushings, wherein a sheet bar (26) is inserted into aclearance between a core complementing the inner profile of the bushing(27) and a first shaping die (12) having a multi-part shaping chamber (22), with one part of the shaping chamber (22) having an inner profile complementing the outer profile of the bushing (27) and the other part of the shaping chamber (22) augmenting the height of the shaping chamber, such that the shaping chamber (22) extends over more than half the circumference of the bushing, that the sheet bar (26) is bent approximately in the form of a U when the core (16) moves relative to and penetrates the first shaping chamber (22), that the core (16) which is now positioned in the first shaping chamber (22) subsequently moves relative to and penetrates a second shaping chamber (24) of a second shaping die(14) whereby in a final shaping step the two legs of the U-shaped formed body are shaped into a bushing (27), with the core (16, 18) penetrating the first shaping chamber (22) by a depth which is greater than the bushing radius, and wherein an auxiliary shaping step is carried out after the pre-shaping step and before the final shaping step, in which auxiliary shaping step the distance between the U-legs of the formed body is decreased, characterized in that the core (16, 18) has a larger cross-sectionduring the auxiliary shaping step than during the final shaping step and is extended in the direction of the U-legs of the formed body, and that when the legs of the formed body together with the enlarged core (16, 18) move in relation to and penetrate the second shaping chamber (24), each of the leg ends (26') is bent inwardly against the enlarged core (16, 18) without simultaneously bending the sections of the legs adjacent to the leg ends (26').
2. The method according to claim 1, characterized in that during the finalshaping step of the bushing (27) the core (16, 18) penetrates the second shaping chamber (24) to a depth greater than the bushing radius, so that after the final shaping step of the bushing (27) is completed, the bushing axis relative to the face plane of the second shaping die (14) is located inside the second shaping chamber (24).
3. The method according to claim 1 or 2, characterized in that the core (16) complementing the shape of the bushing (27) is enlarged by inserting an auxiliary core (18).
4. The method according to claim 3, characterized in that the bending process of the two leg ends 26' starts with a slight delay.
5. The method according to one of claims 1 to 4, characterized in that the bushing (27) is processed in two parallel working areas, that at least the pre-shaping step and the final shaping step of the bushing (27) are carried out in the first working area and that subsequently the bushing (27) is moved by axial displacement into the second working area where it is sized.
6. The method according to claims 3 to 5, characterized in that after the final shaping step is completed, the bushing (27) is moved by the auxiliary core (18) to the second working area and onto a spreader sleeve (42) of the sizing station.
7. The method according to one of claims 1 to 6, characterized in that during the shaping process when both shaping chambers (22, 24) are closed, their girth profile - aside from the wall thickness of the bushing (27) -complements the outside profile of the cross-sectionally enlarged core (16, 18).
8. A device for making bushings (27), the device comprising a lower shaping die (12) and an upper forming die (14) for carrying out the method according to one or several of claims 1 to 7, characterized in that both the core (16, 18) and the first shaping chamber (22) have a larger cross-section during the pre-shaping process than during the final shaping process.
9. The device according to claim 8, characterized in that the first shaping die (12) supports a slider (20) for axial movement parallel to the core, with the slider (20) forming part of the first shaping chamber (22), and that the plane of osculation of the first shaping die (12) which includes the slider (20), is displaced from the bushing center towards the second shaping die.
10. The device according to claim 8 or 9, characterized in that during the pre-shaping step the core (16) comprises an additional auxiliary core (18) seated with a concave surface on the core (16) and having a convex working surface shaped to complement the shape of the inner surface of the shaping chamber of the second shaping die (14).
11. The device according to claims 9 and 10, characterized in that the auxiliarycore (18) in conjunction with the slider (20) forms a movable unit.
12. The device according to one of claims 8 to 11, characterized in that the second shaping die (14) comprises two halves (14a, 14b), with one of the halves (14b) with its associated half of the shaping chamber movably supported on the actuated half (14b) for displacement in a direction parallel to the die movement and resiliently biased in an initial position which is offset with respect to the other die half (14a), such that the shaping chamber (24) forms a step proximate to the location of the bushing edges for the purpose of interlocking.
13. The device according to one of claims 8 to 12, characterized in that each ofthe shaping dies has a width which is at least twice the width of the bushing (27) and comprises in the axial direction - aside from the shaping chambers (22, 24) - at least one sizing chamber (34, 36), that both sizing chambers (34, 6) have the same curvature as the respective shaping chambers (22, 24) while only spanning an angle at circumference of 180°
forming during the final shaping step a sizing cavity closed around the circumference and conforming to the outside envelope of the bushing (27), and that a spreader device (40, 42) is disposed inside the sizing cavity.
forming during the final shaping step a sizing cavity closed around the circumference and conforming to the outside envelope of the bushing (27), and that a spreader device (40, 42) is disposed inside the sizing cavity.
14. The device according to claim 13, characterized in that the core (16) is hollow and is penetrated by an actuator rod (38) adapted for axial displacement, the actuator rod (38) having a cone (40) in the area of the sizing cavity which cooperates with the inner cone of a spreader sleeve (42).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19511095.1 | 1995-03-25 | ||
| DE19511095A DE19511095A1 (en) | 1995-03-25 | 1995-03-25 | Method and device for bending bushings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2220097A1 true CA2220097A1 (en) | 1996-10-03 |
Family
ID=7757805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002220097A Abandoned CA2220097A1 (en) | 1995-03-25 | 1996-03-19 | Method and device for rounding bushings |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0759822B1 (en) |
| JP (1) | JPH10501467A (en) |
| KR (1) | KR970703207A (en) |
| CN (1) | CN1064869C (en) |
| AT (1) | ATE185502T1 (en) |
| CA (1) | CA2220097A1 (en) |
| DE (3) | DE19511095A1 (en) |
| ES (1) | ES2138810T3 (en) |
| RU (1) | RU2161544C2 (en) |
| WO (1) | WO1996030139A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112676418A (en) * | 2020-12-07 | 2021-04-20 | 安徽科达汽车轴瓦有限公司 | Bearing bush stamping and shaping device convenient to locate |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058916C (en) * | 1998-06-15 | 2000-11-29 | 许红喜 | Method for producing shaft sleeve by tetrachronium 13 bar material |
| DE19850220C2 (en) * | 1998-10-31 | 2003-01-02 | Turbo Clean Gmbh | Device for manufacturing bushings |
| DE102010037533A1 (en) * | 2010-09-14 | 2012-03-15 | Thyssenkrupp Steel Europe Ag | Apparatus and method for producing at least partially closed hollow profiles with low cycle time |
| CN102151753A (en) * | 2011-01-08 | 2011-08-17 | 宁波轴瓦厂 | One-step punching and coiling forming die for shaft sleeve |
| CN102172732B (en) * | 2011-01-29 | 2013-01-16 | 昆山联德精密机械有限公司 | Progressive die rounding and core-pulling mechanism |
| PT2834022E (en) * | 2012-04-03 | 2016-06-03 | Thyssenkrupp Steel Europe Ag | Device and method for producing at least partially closed profiles or tubular components from metal sheet |
| CN102615152A (en) * | 2012-04-23 | 2012-08-01 | 无锡铸华机械科技有限公司 | Process and die for one-time round-bending and molding |
| CN102962374B (en) * | 2012-08-10 | 2015-02-25 | 贵州航天精工制造有限公司 | Method and device for machining saddle-type lining part |
| CN103624135A (en) * | 2013-11-27 | 2014-03-12 | 安徽鑫龙电器股份有限公司 | Punching composite die for machining shaft sleeve and machining method thereof |
| MX2017003395A (en) * | 2014-09-18 | 2017-06-19 | Nippon Steel & Sumitomo Metal Corp | Method for manufacturing molded article, mold, and tubular molded article. |
| CN104324987B (en) * | 2014-11-13 | 2016-05-04 | 广州科技职业技术学院 | Automatic rolling circular bending modular system and using method thereof |
| CN104493486B (en) * | 2014-12-23 | 2016-10-12 | 绵阳富临精工机械股份有限公司 | A kind of OCV filter screen rolls double team device and operational method |
| CN105537471B (en) * | 2016-02-03 | 2019-03-08 | 重庆金猫纺织器材有限公司 | A kind of high-precision numerical control molding machine for ring-traveller |
| CN106111837B (en) * | 2016-06-17 | 2017-11-14 | 宁夏太阳镁业有限公司 | A kind of machine-shaping device for magnesium crystallizer |
| EP3597322A4 (en) * | 2017-03-15 | 2021-01-13 | JFE Steel Corporation | Press mold and method for manufacturing steel pipe |
| CN108393381B (en) * | 2018-05-18 | 2023-12-05 | 秦皇岛兴龙轮毂有限公司 | Conical filter screen manufacturing device |
| DE102020000238B4 (en) | 2020-01-16 | 2022-08-04 | Fritz Stepper GmbH & Co. KG. | core station |
| CN111872885B (en) * | 2020-07-01 | 2022-10-04 | 中国石油天然气股份有限公司 | Elastic ball seat curling installation tool and use method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1330782A (en) * | 1918-09-05 | 1920-02-17 | Brown William Milton | Method of and apparatus for making ferrules |
| US1802723A (en) * | 1928-12-19 | 1931-04-28 | Cleveland Graphite Bronze Co | Method of and apparatus for making bearings |
| FR675967A (en) * | 1929-05-30 | 1930-02-17 | Pont A Mousson Fond | Improvements to the process and installations for the manufacture of tubes |
| US2126473A (en) * | 1933-08-31 | 1938-08-09 | Gen Motors Corp | Method of making tubular articles |
| US2077336A (en) * | 1935-01-07 | 1937-04-13 | Gen Motors Corp | Apparatus for forming circular bushings |
| DE667949C (en) * | 1936-02-29 | 1938-11-23 | Sonntag G M B H R | Device for the production of pipes on a press brake |
| US3675460A (en) * | 1970-06-08 | 1972-07-11 | Torin Corp | Four-slide machine with improved mandrel for producing bearings and the like |
| US3973717A (en) * | 1975-04-21 | 1976-08-10 | Ppg Industries, Inc. | Bushing fabrication |
| DE3523091A1 (en) * | 1985-06-28 | 1987-01-02 | Feuchtenberger Irmgard | Process for the manufacture of annular machine elements |
| DD287148A7 (en) * | 1988-12-19 | 1991-02-21 | Thueringer Gartengeraete Gmbh,De | TOOL FOR THE MANUFACTURE OF A CONDUCTIVE PIPE TUBE |
-
1995
- 1995-03-25 DE DE19511095A patent/DE19511095A1/en not_active Withdrawn
- 1995-07-07 DE DE29511070U patent/DE29511070U1/en not_active Expired - Lifetime
-
1996
- 1996-03-19 KR KR1019960706661A patent/KR970703207A/en not_active Application Discontinuation
- 1996-03-19 CA CA002220097A patent/CA2220097A1/en not_active Abandoned
- 1996-03-19 RU RU96124365/02A patent/RU2161544C2/en not_active IP Right Cessation
- 1996-03-19 WO PCT/EP1996/001172 patent/WO1996030139A1/en active IP Right Grant
- 1996-03-19 CN CN961902299A patent/CN1064869C/en not_active Expired - Fee Related
- 1996-03-19 DE DE59603336T patent/DE59603336D1/en not_active Expired - Fee Related
- 1996-03-19 ES ES96908069T patent/ES2138810T3/en not_active Expired - Lifetime
- 1996-03-19 EP EP96908069A patent/EP0759822B1/en not_active Expired - Lifetime
- 1996-03-19 AT AT96908069T patent/ATE185502T1/en not_active IP Right Cessation
- 1996-03-19 JP JP8528874A patent/JPH10501467A/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112676418A (en) * | 2020-12-07 | 2021-04-20 | 安徽科达汽车轴瓦有限公司 | Bearing bush stamping and shaping device convenient to locate |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0759822B1 (en) | 1999-10-13 |
| DE19511095A1 (en) | 1996-09-26 |
| KR970703207A (en) | 1997-07-03 |
| DE29511070U1 (en) | 1995-09-14 |
| CN1148822A (en) | 1997-04-30 |
| ES2138810T3 (en) | 2000-01-16 |
| JPH10501467A (en) | 1998-02-10 |
| WO1996030139A1 (en) | 1996-10-03 |
| RU2161544C2 (en) | 2001-01-10 |
| ATE185502T1 (en) | 1999-10-15 |
| EP0759822A1 (en) | 1997-03-05 |
| CN1064869C (en) | 2001-04-25 |
| DE59603336D1 (en) | 1999-11-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |