CA1066600A - Sheet metal bending machine - Google Patents
Sheet metal bending machineInfo
- Publication number
- CA1066600A CA1066600A CA291,713A CA291713A CA1066600A CA 1066600 A CA1066600 A CA 1066600A CA 291713 A CA291713 A CA 291713A CA 1066600 A CA1066600 A CA 1066600A
- Authority
- CA
- Canada
- Prior art keywords
- die
- sheet metal
- face
- channel
- female
- 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
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/08—Bending by altering the thickness of part of the cross-section of the work
-
- 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
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/20—Bending sheet metal, not otherwise provided for
- B21D11/206—Curving corrugated sheets
-
- 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
- B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
- B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing
-
- 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
- B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A bending machine for bending longitudinally elongated channel-shaped sheet metal members according to the present in-vention consists of a frame and a die set including a female die assembly and a male die assembly and drive means for driving the die set to and fro between an open and closed position. The female die assembly consists of two members, one of which is held stationary relative to the frame and the other of which is movable relative to the first for movement towards and away from the male die element. The first member of the female die assembly serves to clamp the channel-shaped member with respect to the male die element and the second member of the female die assembly serves to form corrugations in the elongated channel-shaped members.
A bending machine for bending longitudinally elongated channel-shaped sheet metal members according to the present in-vention consists of a frame and a die set including a female die assembly and a male die assembly and drive means for driving the die set to and fro between an open and closed position. The female die assembly consists of two members, one of which is held stationary relative to the frame and the other of which is movable relative to the first for movement towards and away from the male die element. The first member of the female die assembly serves to clamp the channel-shaped member with respect to the male die element and the second member of the female die assembly serves to form corrugations in the elongated channel-shaped members.
Description
1~6600 . . , FIELD OF INVENTION
This invention relates to a bending machlne for bend-ing longitudinally elongated channel-shaped members to an arcuate curvature.
PRIOR ART
Channel-shaped sheet metal members have been used in the fabrication of arcuate-shaped metal buildings for some con-siderable time. Difriculty has been experlenced in forming the channel-shaped members to the required arcuate configuration without substantially reducing the structural strength of the sheet metal members. In the bendlng operations presently used, local areas of the sheet metal members are stretched or buckled with the resulting decrease in structural strength.
The bendlng machlne of the present invention serves to form corrugations in the bottom and side walls of the channel-shaped member to efrect a reduction in length thereof and there-by bend the channel-shaped member to an arcuate configuration.
The machine i8 set up to form the corrugationa ln a manner such that there ls little or no stretchlng or buckling of the sheet metal ln the area of the corrugations.
The bendlng machlne may also have a reedlng mechanlsm which serves to release the sheet metal member from the bendlng dles after each bendlng stroke to facilltate the movement of the sheet metal member through the blte of the dles.
SUMMARY OF INVENTION
Accordlng to one aspect Or the present lnvention, a bending machine for bendlng longitudlnally elongated channel- .-;
shaped sheet metal members comprises a frame, a die set mounted in sald frame comprising; a remale die assembly comprising, a first member h&ving a rlrst die face formed to provlde a bottom face and side faces arranged in a female channel conflguration to provlde exterior support for a channel-shaped sheet metal mem-ber, a pa~sage formed in sald first member and opening at said dle face through sald bottom and slde faces; and a second member mounted for movement relative to sald first member and having a bending edge movable between an extended pos~tion in which it pro~ects outwardly from said flrst die ~ace through sald passage and a withdrawn posltlon in which it does not pro~ect beyond sald flrst dle face, a male dle element having a second die face ~ormed wlth bottom and side faces arranged opposite said bottom and slde faces respectively of sald female die, sald male dle element being mounted for movement towards and away from said first member of said female die assembly between an open position to permit movement of a sheet metal member therebetween and a closed positlon to clamp a channel-shaped sheet member there-between about the periphery or said pas~age, drlve means for drlving the male die element relative to the first member of the female die assembly to clamp a sheet metal member therebetween about the perlphery Or said passage and therearter to drive the se¢ond member rrom said withdrawn position to said extended posltlon to bend the bottom and slde walls Or the sheet metal to form a transversely extendlng corrugation in the sheet metal member and thereby shorten the bottom wall Or the sheet metal member ln relatlon to the outer ends of lts slde walls and thereby bend the sheet metal member ln the direction Or its longitudinal extent.
According to a further aspect Or the present lnvention, there is provided in a bending machine Or the type described above endles~ conveyor means extending rearwardly and forwardly from the rirst member of the ~emale die through recesses in the - .
.. - . . . . . . . ~ ........................ . . . .
.
.
1~6600 dle face of the flrst member, the conveyor means being drawn to a taut configuratlon in a plane spaced outwardly from the first dle race ~or e~ectlng the sheet metal members from the ~emale dle prlor to advancement oP the sheet metal members through the die, the conveyor means havlng a sufficient length when relaxed ~ -to permit lt to be lowered into the recess means provided in the flrst die when the dle set is in a closed posltion.
PREFERRED EMBODIMENT
The invention will be more clearly understood after rererence to the follow~ng detalled speclricatlon read ln con-~unction with the drawlngs whereln, Fig. 1 is a plctorlal vlew Or a machlne accordlng to an embodlment ~ the present inventlon;
Flg. 2 ls a plctorlal vlew Or a sheet metal member after lt ls bent by the machlne Or the present lnventlon;
Flg. 3 is a sectlonal vlew ln the dlrectlon Or the arrows 3-3 Or Fig. 2 wlth the die members located ln a posltlon to rorm the requlred corrugatlon;
Flgs. 4 and 5 are sectlonal views slmllar to Flg. 3 taken along line 4-4 and llne 5-5 Or Flg. 2, respectively, showlng the contour Or the corrugations;
Flg. 6 18 a view Or an upper edge Or a sheet metal member ln the dlrection Or the arrow 6 Or Flg. 2; and Flg. 7 18 a sectlonal vlew ln the dlrectlon Or the arrow 7-7 Or Flg. 2.
Wlth rererence to the drawlngs, the reference numeral 10 rerers generally to a bending machine constructed in accord-ance wlth an embodlment Or the present lnvention.
The bending machine 10 ls used to bend a longltudln-ally elongated channel-shaped sheet metal structural member 12 ' ' ' .; ~ . . , . :~ ~ -(Fig. 1 & 2), hereinafter referred to as channel-shaped member 12. The channel-shaped member 12 ls formed from sheet metal and has a bottom wall 14 and a palr o~ oppositely disposed side walls 16, each Or whlch has a lip 18 at the upper end thereof.
In use, the bending machlne 10 serves to lmpart a longltudinal curvature to the channel-shaped member 12 by formlng a plurallty of corrugations ln the bottom wall 14 and in side walls 16. The depth Or corrugation in the slde walls 16 decreases ln a dlrec-tlon towards the ilp 18 with the result that there is a pro-gressive shortenlng Or the length Or the channel-shaped member ln a dlrectlon away rrom the l~ps 18.
The bendlng machine 10 has a frame~ generally identi-rled by the rererence numeral 20, whlch cons~sts Or a base 22, a pair or oppos~tely disposed slde walls 24, a top wall member 26 and a race plate 28 Whlch extends between s~de walls 24.
A die set 30 is mounted ln the frame lO and conslsts of a female dle assembly 32 and a male die element 34. The fe-male dle assembly 32 conslsts Or a rlrst member 36 whlch 1 mounted ln a rlxed posltlon wlth respect to the race plate 28. :
The rlrst member 36 has a rlrst dle race 38 rormed to provlde a bottom face 40 and a palr Or opposltely dlsposed slde ~ace~ 42.
The slde races 42 each lnclude a shoulder portlon 44 formed with recesses 46. The rlrst dle face 38 ~erves to support the ex-terlor surrace Or the channel-shaped member 12 durlng the bend-lng operatlon. A passage 48 extends longltudlnally through the ..
body Or the rlrst member 36 and opens outwardly thererrom ~ -centrally Or the length o~ the rlrst dle race 38 at the bottom face 40 and slde races 42. A second member 50 ls slldably - -mounted ln the passage 48 for movement relatlve to the rlrst member 36. The second member 50 has a bendlng edge 52 at the ~: ~ .... , ~ . . . - - .. .. .
.. . . , - . .. . .. . .
1~66600 upper end thereof which is adapted to pro~ect outwardly from the first die face through the passage 48 and to be withdrawn lnwardly of the passage 48 so that it does not pro~ect beyond the flrst die face.
The male die element 34 has a second dle face 54 formed - -wlth bottom and slde faces arranged opposlte the bottom and slde faces respectlvely of the female dle assembly. The second die face 54 has a corrugatlon recess 56 extending along the bottom and side faces thereof ln a conflguration corresponding to the required contour of the corrugations to be formed in the channel-shaped member. Opposite slde edges Or the male dle 30 are mou~d ln g~ldes 60. The male die element 34 ls normally urged to its raised posltlon by coil sprlngs 62 which have one end resting on a bracket 64 which ls secured with respect to the frame 20 and thslr opposlte end bearlng agalnst the shoulder 66 at opposite sldes of the die. A pair of cam follower rollers 68 are mounted in brackets 70 whlch pro~ect upwardly from the upper edge Or the mall dle element. Cams 72 are mounted on shart 74 whlch is 3Ournalled ln support brackets 76 whlch depend from the top wall 20 member 26 of the frame. The shart 74 pr~ects outwardly from one side Or the brackets 76 and has a sprocket 78 mounted thereon by means of whlch the shaft 74 and cams 72 are rotatably drlven to drlve the male dle member downwardly ~lth springs 62 serving to raise the male dle element.
The drlve mechanlsm for drlvlng the second member 50 of the remale dle assembly comprlses a maln drlve shaft 80 whlch has eccentrlc collars 82 mounted for rotation therewlth. A pair of arms 84 are mounted one on each eccentric collar 82 and have thelr upper ends pivotally connected by pivot pins 86 to brackets 30 88 which are secured to the lower end of the second member 50 Or ,~
' .
the female die. When the main drlve shaft 80 is rotatably driven, the eccentrlc collars 82 rotate with the shaft relative to the arms 84 and cause the arms 84 to reclprocate vertlcally to move the second dle element 50 between its ralsed and lowered posl-tlon3 wlth respect to the flrst dle member 32. A sprocket 90 ls located at one end of the maln drive shaft 94 and ls connected to the sprocket 78 by a drlve chaln 92 so that the rotatlon Or the shaft 74 and shaft 80 may be synchronlzed.
The maln drlve shart 80 ls drlven by a motor 94 through reductlon gear 96, drive belt 98 and fly wheel 100.
The feedlng mechanlsm for feeding elongated channel-shaped sheet metal members through the dle set conslsts Or a pair Or conveyors, generally ldentifled by the reference numeral 102, arranged ~ a spaced parallel relatlonshlp one on elther slde Or the flrst dle member 32. The conveyors 102 each have a support ~ame, generally ldentlfled by the rererence numeral 104, and conslst of a chaln 106 whlch have a reedlng run 110 extendlng over gulde pulleys 108 located rorwardly of the dle set and 112 located rearwardly Or the dle set. The return run Or the chaln 106 extends over pulleys 114, 116 and 118. The rrame 104 ln-cludes support ralls 120 whlch underlle and support the reedlng run Or the chaln to a polnt ad~acent the dle set. The pulleys 108 and 112 are located at a helght 80 that when the reedlng run 110 o the chaln ls taut, the chaln~ wlll rlse out Or the reces-ses 46 ln the female dle ln whlch they are located when relaxed, to e~ect the channel-shaped ~heet metal member rrom the female dle and to ralse lt above the dle race to racilitate ~rward movement thereof between the dles. The forward movement 18 achleved by a ratchet mechanlsm drlven rrom the maln drlve sha~t 80. The pulleys 114 are mounted on shart 122 whlch 18 .
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10~i6600 ~ournalled in bearings 124 carried by the slde wall members 24 o~ the frame. A ratchet mechanism 126 is mounted at one end Or the shaft 122 and has a lever arm 128 pro~ectlng outwardly there-rrom. The lever arm 128 has an elongated slot 130 extendlng longltudinally thereor. An eccentrlc collar 132 ls mounted on and keyed to main drive shaft 80 ~or rotation therewith. An arm 134 ls mounted on the collar 132 and has its outer end ad~ust- -ably secured to the lever 128 by mounting screw 136 whlch may be located at any point alone the length of the slot 130 to ad~ust the length Or stroke of the arm 128 and thereby ad~ust the length Or stroke of the feeding mechanlsm.
From the foregolng descrlptlon o~ the bendlng machlne Or the pre~erred embodlment, lt wlll be apparent that the move-ment of the various dle elements and reeding mechanism is achleved by the use of a series of simple mechanlcal mechanlsms whlch may be ad~usted and repalred by mechanics havlng only mlnlmal knowledge o~ mechanlcal devlces. The mechanlsm does not employ any complex hydraullc or pneumatlc system rOr achlevlng the requlred movement and ad~ustment and consequently lt lsault-able rOr use ln small lndustrlal plants an d ln areas whereskllled maintenance personnel are not readlly avallable.
In operatlon, the feedlng mechanlsm ls ad~usted to provlde a ~orward stroke upon each rotatlon of the main drlve shaft equal to the required pltch between each successlve cor-rugatlon to achleve the requlred arc of curvature ln the channel-shaped sheet metal members. The smaller the radlus Or curvature, the closer the corrugatlons formed by the bendlng machlne should be located. When the requlred pltch has been determlned and the machlne ad~usted to achleve the req~lred ~eedlng stroke, a channel-shaped member ls located on the conveyor forward run 102 1~)66600 and the machine ls actlvated to move the channel-shaped member between the dles when in an open positlon. When the channel-shaped sheet metal member is located between the male and female dles, the flrst step ln the bendlng operation is a clamping operatlon resultlng from the mevement of the male dle member to-wards the remale die in response to rotation of the cams 70 carried by the shaft 74. After the sheet metal member is clamped between the male dle element 30 and the statlonary ~lrst member 32 of the female dle about the perlphery Or the passage 48, the eccentric collars 82 carrled by the main drlve shaft 80 are timed to ralse the arms 84 and thereby ralse the second dle element 50 of the remale dle to drive the bendlng edge 52 up-wardly through the passage 38 against the sheet metal member to derorm lt lnto the dle cavitles 54 and 56 formed in the die face of the male die element 34. Further rotation of shart~ 74 and 80 causes the male die element 34 to be raised and the second member 50 Or the remale die element to be lowered.
During the bendlng operation, the eccentric collar 132 Or the reedlng mechanlsm has been operatlng to rotate the lever arm 128 Or the ratchet mechanlsm ln lts non-indexlng dlrectlon. -~
However, when the dles begln to open, the lever arm 128 is drawn ln lts lndexlng dlrectlon and lnltlally thls causes the reedlng chalns 102 to be pulled to a taut condltlon causlng the feeding run to rlse out Or the notches 46 ln the remale die, thereby raislng the sheet metal member out Or engagement wlth the dle race Or the ~emale mould. Continued operation Or the indexlng mechanism causes the reeder chains 102 to advance the sheet metal member through the die to the required locatlon ror the next corrugation. Therearter, the bendlng cycle Or operatlon descrlbed above 18 repeated.
...... , , . . ' ~
. . ~ . -As shown in Fig. 7, the corrugated metal member is not corrugated at the longitudinal fold lines along the bottom wall 14. It will be understood that in order to shorten the bottom wall 14 by forming corrugations, it will be necessary to permlt metal flow to occur at the edges of the bottom wall 14 so that there wlll be an lncrease in thlckness in thls area result-lng from the corrugating operation. For this reason, the dis-tance between ad~acent corners Or the flrst and second die faces i8 greater than the distance between the opposltely disposed bottom and slde ~aces of the flrst dle face and second dle face when the dies are in the closed positlon.
It wlll be apparent that the bending machlne of the present lnvention provides a simple and efricient mechanlsm for rormlng a longitudinal arc of curvature in an elongated channel-shaped sheet metal member by forming a plurality of transversely extendlng corrugations in the bottom and side walls of the sheet metal member.
.
-.
,.' ' "
_g_
This invention relates to a bending machlne for bend-ing longitudinally elongated channel-shaped members to an arcuate curvature.
PRIOR ART
Channel-shaped sheet metal members have been used in the fabrication of arcuate-shaped metal buildings for some con-siderable time. Difriculty has been experlenced in forming the channel-shaped members to the required arcuate configuration without substantially reducing the structural strength of the sheet metal members. In the bendlng operations presently used, local areas of the sheet metal members are stretched or buckled with the resulting decrease in structural strength.
The bendlng machlne of the present invention serves to form corrugations in the bottom and side walls of the channel-shaped member to efrect a reduction in length thereof and there-by bend the channel-shaped member to an arcuate configuration.
The machine i8 set up to form the corrugationa ln a manner such that there ls little or no stretchlng or buckling of the sheet metal ln the area of the corrugations.
The bendlng machlne may also have a reedlng mechanlsm which serves to release the sheet metal member from the bendlng dles after each bendlng stroke to facilltate the movement of the sheet metal member through the blte of the dles.
SUMMARY OF INVENTION
Accordlng to one aspect Or the present lnvention, a bending machine for bendlng longitudlnally elongated channel- .-;
shaped sheet metal members comprises a frame, a die set mounted in sald frame comprising; a remale die assembly comprising, a first member h&ving a rlrst die face formed to provlde a bottom face and side faces arranged in a female channel conflguration to provlde exterior support for a channel-shaped sheet metal mem-ber, a pa~sage formed in sald first member and opening at said dle face through sald bottom and slde faces; and a second member mounted for movement relative to sald first member and having a bending edge movable between an extended pos~tion in which it pro~ects outwardly from said flrst die ~ace through sald passage and a withdrawn posltlon in which it does not pro~ect beyond sald flrst dle face, a male dle element having a second die face ~ormed wlth bottom and side faces arranged opposite said bottom and slde faces respectively of sald female die, sald male dle element being mounted for movement towards and away from said first member of said female die assembly between an open position to permit movement of a sheet metal member therebetween and a closed positlon to clamp a channel-shaped sheet member there-between about the periphery or said pas~age, drlve means for drlving the male die element relative to the first member of the female die assembly to clamp a sheet metal member therebetween about the perlphery Or said passage and therearter to drive the se¢ond member rrom said withdrawn position to said extended posltlon to bend the bottom and slde walls Or the sheet metal to form a transversely extendlng corrugation in the sheet metal member and thereby shorten the bottom wall Or the sheet metal member ln relatlon to the outer ends of lts slde walls and thereby bend the sheet metal member ln the direction Or its longitudinal extent.
According to a further aspect Or the present lnvention, there is provided in a bending machine Or the type described above endles~ conveyor means extending rearwardly and forwardly from the rirst member of the ~emale die through recesses in the - .
.. - . . . . . . . ~ ........................ . . . .
.
.
1~6600 dle face of the flrst member, the conveyor means being drawn to a taut configuratlon in a plane spaced outwardly from the first dle race ~or e~ectlng the sheet metal members from the ~emale dle prlor to advancement oP the sheet metal members through the die, the conveyor means havlng a sufficient length when relaxed ~ -to permit lt to be lowered into the recess means provided in the flrst die when the dle set is in a closed posltion.
PREFERRED EMBODIMENT
The invention will be more clearly understood after rererence to the follow~ng detalled speclricatlon read ln con-~unction with the drawlngs whereln, Fig. 1 is a plctorlal vlew Or a machlne accordlng to an embodlment ~ the present inventlon;
Flg. 2 ls a plctorlal vlew Or a sheet metal member after lt ls bent by the machlne Or the present lnventlon;
Flg. 3 is a sectlonal vlew ln the dlrectlon Or the arrows 3-3 Or Fig. 2 wlth the die members located ln a posltlon to rorm the requlred corrugatlon;
Flgs. 4 and 5 are sectlonal views slmllar to Flg. 3 taken along line 4-4 and llne 5-5 Or Flg. 2, respectively, showlng the contour Or the corrugations;
Flg. 6 18 a view Or an upper edge Or a sheet metal member ln the dlrection Or the arrow 6 Or Flg. 2; and Flg. 7 18 a sectlonal vlew ln the dlrectlon Or the arrow 7-7 Or Flg. 2.
Wlth rererence to the drawlngs, the reference numeral 10 rerers generally to a bending machine constructed in accord-ance wlth an embodlment Or the present lnvention.
The bending machine 10 ls used to bend a longltudln-ally elongated channel-shaped sheet metal structural member 12 ' ' ' .; ~ . . , . :~ ~ -(Fig. 1 & 2), hereinafter referred to as channel-shaped member 12. The channel-shaped member 12 ls formed from sheet metal and has a bottom wall 14 and a palr o~ oppositely disposed side walls 16, each Or whlch has a lip 18 at the upper end thereof.
In use, the bending machlne 10 serves to lmpart a longltudinal curvature to the channel-shaped member 12 by formlng a plurallty of corrugations ln the bottom wall 14 and in side walls 16. The depth Or corrugation in the slde walls 16 decreases ln a dlrec-tlon towards the ilp 18 with the result that there is a pro-gressive shortenlng Or the length Or the channel-shaped member ln a dlrectlon away rrom the l~ps 18.
The bendlng machine 10 has a frame~ generally identi-rled by the rererence numeral 20, whlch cons~sts Or a base 22, a pair or oppos~tely disposed slde walls 24, a top wall member 26 and a race plate 28 Whlch extends between s~de walls 24.
A die set 30 is mounted ln the frame lO and conslsts of a female dle assembly 32 and a male die element 34. The fe-male dle assembly 32 conslsts Or a rlrst member 36 whlch 1 mounted ln a rlxed posltlon wlth respect to the race plate 28. :
The rlrst member 36 has a rlrst dle race 38 rormed to provlde a bottom face 40 and a palr Or opposltely dlsposed slde ~ace~ 42.
The slde races 42 each lnclude a shoulder portlon 44 formed with recesses 46. The rlrst dle face 38 ~erves to support the ex-terlor surrace Or the channel-shaped member 12 durlng the bend-lng operatlon. A passage 48 extends longltudlnally through the ..
body Or the rlrst member 36 and opens outwardly thererrom ~ -centrally Or the length o~ the rlrst dle race 38 at the bottom face 40 and slde races 42. A second member 50 ls slldably - -mounted ln the passage 48 for movement relatlve to the rlrst member 36. The second member 50 has a bendlng edge 52 at the ~: ~ .... , ~ . . . - - .. .. .
.. . . , - . .. . .. . .
1~66600 upper end thereof which is adapted to pro~ect outwardly from the first die face through the passage 48 and to be withdrawn lnwardly of the passage 48 so that it does not pro~ect beyond the flrst die face.
The male die element 34 has a second dle face 54 formed - -wlth bottom and slde faces arranged opposlte the bottom and slde faces respectlvely of the female dle assembly. The second die face 54 has a corrugatlon recess 56 extending along the bottom and side faces thereof ln a conflguration corresponding to the required contour of the corrugations to be formed in the channel-shaped member. Opposite slde edges Or the male dle 30 are mou~d ln g~ldes 60. The male die element 34 ls normally urged to its raised posltlon by coil sprlngs 62 which have one end resting on a bracket 64 which ls secured with respect to the frame 20 and thslr opposlte end bearlng agalnst the shoulder 66 at opposite sldes of the die. A pair of cam follower rollers 68 are mounted in brackets 70 whlch pro~ect upwardly from the upper edge Or the mall dle element. Cams 72 are mounted on shart 74 whlch is 3Ournalled ln support brackets 76 whlch depend from the top wall 20 member 26 of the frame. The shart 74 pr~ects outwardly from one side Or the brackets 76 and has a sprocket 78 mounted thereon by means of whlch the shaft 74 and cams 72 are rotatably drlven to drlve the male dle member downwardly ~lth springs 62 serving to raise the male dle element.
The drlve mechanlsm for drlvlng the second member 50 of the remale dle assembly comprlses a maln drlve shaft 80 whlch has eccentrlc collars 82 mounted for rotation therewlth. A pair of arms 84 are mounted one on each eccentric collar 82 and have thelr upper ends pivotally connected by pivot pins 86 to brackets 30 88 which are secured to the lower end of the second member 50 Or ,~
' .
the female die. When the main drlve shaft 80 is rotatably driven, the eccentrlc collars 82 rotate with the shaft relative to the arms 84 and cause the arms 84 to reclprocate vertlcally to move the second dle element 50 between its ralsed and lowered posl-tlon3 wlth respect to the flrst dle member 32. A sprocket 90 ls located at one end of the maln drive shaft 94 and ls connected to the sprocket 78 by a drlve chaln 92 so that the rotatlon Or the shaft 74 and shaft 80 may be synchronlzed.
The maln drlve shart 80 ls drlven by a motor 94 through reductlon gear 96, drive belt 98 and fly wheel 100.
The feedlng mechanlsm for feeding elongated channel-shaped sheet metal members through the dle set conslsts Or a pair Or conveyors, generally ldentifled by the reference numeral 102, arranged ~ a spaced parallel relatlonshlp one on elther slde Or the flrst dle member 32. The conveyors 102 each have a support ~ame, generally ldentlfled by the rererence numeral 104, and conslst of a chaln 106 whlch have a reedlng run 110 extendlng over gulde pulleys 108 located rorwardly of the dle set and 112 located rearwardly Or the dle set. The return run Or the chaln 106 extends over pulleys 114, 116 and 118. The rrame 104 ln-cludes support ralls 120 whlch underlle and support the reedlng run Or the chaln to a polnt ad~acent the dle set. The pulleys 108 and 112 are located at a helght 80 that when the reedlng run 110 o the chaln ls taut, the chaln~ wlll rlse out Or the reces-ses 46 ln the female dle ln whlch they are located when relaxed, to e~ect the channel-shaped ~heet metal member rrom the female dle and to ralse lt above the dle race to racilitate ~rward movement thereof between the dles. The forward movement 18 achleved by a ratchet mechanlsm drlven rrom the maln drlve sha~t 80. The pulleys 114 are mounted on shart 122 whlch 18 .
.
10~i6600 ~ournalled in bearings 124 carried by the slde wall members 24 o~ the frame. A ratchet mechanism 126 is mounted at one end Or the shaft 122 and has a lever arm 128 pro~ectlng outwardly there-rrom. The lever arm 128 has an elongated slot 130 extendlng longltudinally thereor. An eccentrlc collar 132 ls mounted on and keyed to main drive shaft 80 ~or rotation therewith. An arm 134 ls mounted on the collar 132 and has its outer end ad~ust- -ably secured to the lever 128 by mounting screw 136 whlch may be located at any point alone the length of the slot 130 to ad~ust the length Or stroke of the arm 128 and thereby ad~ust the length Or stroke of the feeding mechanlsm.
From the foregolng descrlptlon o~ the bendlng machlne Or the pre~erred embodlment, lt wlll be apparent that the move-ment of the various dle elements and reeding mechanism is achleved by the use of a series of simple mechanlcal mechanlsms whlch may be ad~usted and repalred by mechanics havlng only mlnlmal knowledge o~ mechanlcal devlces. The mechanlsm does not employ any complex hydraullc or pneumatlc system rOr achlevlng the requlred movement and ad~ustment and consequently lt lsault-able rOr use ln small lndustrlal plants an d ln areas whereskllled maintenance personnel are not readlly avallable.
In operatlon, the feedlng mechanlsm ls ad~usted to provlde a ~orward stroke upon each rotatlon of the main drlve shaft equal to the required pltch between each successlve cor-rugatlon to achleve the requlred arc of curvature ln the channel-shaped sheet metal members. The smaller the radlus Or curvature, the closer the corrugatlons formed by the bendlng machlne should be located. When the requlred pltch has been determlned and the machlne ad~usted to achleve the req~lred ~eedlng stroke, a channel-shaped member ls located on the conveyor forward run 102 1~)66600 and the machine ls actlvated to move the channel-shaped member between the dles when in an open positlon. When the channel-shaped sheet metal member is located between the male and female dles, the flrst step ln the bendlng operation is a clamping operatlon resultlng from the mevement of the male dle member to-wards the remale die in response to rotation of the cams 70 carried by the shaft 74. After the sheet metal member is clamped between the male dle element 30 and the statlonary ~lrst member 32 of the female dle about the perlphery Or the passage 48, the eccentric collars 82 carrled by the main drlve shaft 80 are timed to ralse the arms 84 and thereby ralse the second dle element 50 of the remale dle to drive the bendlng edge 52 up-wardly through the passage 38 against the sheet metal member to derorm lt lnto the dle cavitles 54 and 56 formed in the die face of the male die element 34. Further rotation of shart~ 74 and 80 causes the male die element 34 to be raised and the second member 50 Or the remale die element to be lowered.
During the bendlng operation, the eccentric collar 132 Or the reedlng mechanlsm has been operatlng to rotate the lever arm 128 Or the ratchet mechanlsm ln lts non-indexlng dlrectlon. -~
However, when the dles begln to open, the lever arm 128 is drawn ln lts lndexlng dlrectlon and lnltlally thls causes the reedlng chalns 102 to be pulled to a taut condltlon causlng the feeding run to rlse out Or the notches 46 ln the remale die, thereby raislng the sheet metal member out Or engagement wlth the dle race Or the ~emale mould. Continued operation Or the indexlng mechanism causes the reeder chains 102 to advance the sheet metal member through the die to the required locatlon ror the next corrugation. Therearter, the bendlng cycle Or operatlon descrlbed above 18 repeated.
...... , , . . ' ~
. . ~ . -As shown in Fig. 7, the corrugated metal member is not corrugated at the longitudinal fold lines along the bottom wall 14. It will be understood that in order to shorten the bottom wall 14 by forming corrugations, it will be necessary to permlt metal flow to occur at the edges of the bottom wall 14 so that there wlll be an lncrease in thlckness in thls area result-lng from the corrugating operation. For this reason, the dis-tance between ad~acent corners Or the flrst and second die faces i8 greater than the distance between the opposltely disposed bottom and slde ~aces of the flrst dle face and second dle face when the dies are in the closed positlon.
It wlll be apparent that the bending machlne of the present lnvention provides a simple and efricient mechanlsm for rormlng a longitudinal arc of curvature in an elongated channel-shaped sheet metal member by forming a plurality of transversely extendlng corrugations in the bottom and side walls of the sheet metal member.
.
-.
,.' ' "
_g_
Claims (4)
1. A bending machine for bending longitudinally elongated channel-shaped sheet metal members comprising, (a) a frame, (b) a die set mounted in said frame comprising;
(i) a female die assembly comprising, a first mem-ber having a first die race formed to provide a bottom face and side faces arranged in a female channel configuration to provide exterior support for a channel-shaped sheet metal member, a passage formed in said first member and opening at said die face through said bottom and side faces; and a second member mounted for movement relative to said first member and having a bending edge movable between an extended position in which it protects outwardly from said first die face through said passage and a withdrawn position in which it does not protect beyond said first die race, (ii) a male die element having a second die face formed with bottom and side races arranged opposite said bottom and side races respectively of said female die, said male die element being mounted for movement towards and away from said first member of said female die assembly between an open position to permit movement of a sheet metal member therebetween and a closed position to clamp a channel-shaped sheet member there between about the periphery of said passage, (c) drive means for driving the male die element rela-tive to the first member of the female die assembly to clamp a sheet metal member therebetween about the periphery of said passage and thereafter to drive the second member from said withdrawn position to said extended position to bend the bottom and side walls of the sheet metal to form a transversely ex-tending corrugation in the sheet metal member and thereby shorten the bottom wall of the sheet metal member in relation to the outer ends of its side walls and thereby bend the sheet metal member in the direction of its longitudinal extent.
(i) a female die assembly comprising, a first mem-ber having a first die race formed to provide a bottom face and side faces arranged in a female channel configuration to provide exterior support for a channel-shaped sheet metal member, a passage formed in said first member and opening at said die face through said bottom and side faces; and a second member mounted for movement relative to said first member and having a bending edge movable between an extended position in which it protects outwardly from said first die face through said passage and a withdrawn position in which it does not protect beyond said first die race, (ii) a male die element having a second die face formed with bottom and side races arranged opposite said bottom and side races respectively of said female die, said male die element being mounted for movement towards and away from said first member of said female die assembly between an open position to permit movement of a sheet metal member therebetween and a closed position to clamp a channel-shaped sheet member there between about the periphery of said passage, (c) drive means for driving the male die element rela-tive to the first member of the female die assembly to clamp a sheet metal member therebetween about the periphery of said passage and thereafter to drive the second member from said withdrawn position to said extended position to bend the bottom and side walls of the sheet metal to form a transversely ex-tending corrugation in the sheet metal member and thereby shorten the bottom wall of the sheet metal member in relation to the outer ends of its side walls and thereby bend the sheet metal member in the direction of its longitudinal extent.
2. A bending machine as claimed in claim 1 wherein the bottom and side faces of said first die face meet at corners at opposite sides of the bottom face and the bottom and side faces of the second die face meet at corners at opposite sides of the bottom face thereof, and the distance between adjacent corners of said first and second die faces being greater than the distance between the oppositely disposed bottom and side faces of said first die face and said second die face when said first die member and said male die element are in said closed position thereby to permit an increase in thickness of the por-tion of the elongated channel-shaped member located at said cor-ners during the formation of said transverse ridges and thus prevent buckling of the channel-shaped member.
3. A bending machine as claimed in Claim 1 including feeder means for feeding elongated channel-shaped sheet metal members through said die set comprising, a pair of endless conveyor members arranged in spaced parallel relationship one at either side of said first member of said female die assembly, each endless conveyor member having a feeding run extending rearwardly and forwardly from said first member and through recesses in said first die face and feeder drive means for intermittently advancing said endless conveyor members to move a sheet metal member towards said die set.
4. A bending machine as claimed in Claim 3 in-cluding guide means disposed forwardly and rearwardly from said die set for supporting said feeder run of said conveyor in a plane which is spaced outwardly from said first die face such that when said feeding run is taut for advancement of said sheet metal members, it will be raised from its recess in said first die face to elevate-the sheet metal member from the first die face to permit it to move freely relative to said first die member, said feeding run having a sufficient length when re-laxed to permit it to be lowered into its recess in said first die when said die set is in said closed position.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA291,713A CA1066600A (en) | 1977-11-24 | 1977-11-24 | Sheet metal bending machine |
| GB7843534A GB2008999B (en) | 1977-11-24 | 1978-11-07 | Shett metal bending machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA291,713A CA1066600A (en) | 1977-11-24 | 1977-11-24 | Sheet metal bending machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1066600A true CA1066600A (en) | 1979-11-20 |
Family
ID=4110129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA291,713A Expired CA1066600A (en) | 1977-11-24 | 1977-11-24 | Sheet metal bending machine |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1066600A (en) |
| GB (1) | GB2008999B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU668944B2 (en) * | 1992-04-22 | 1996-05-23 | M.I.C. Industries, Inc. | Machine and method for forming arched roof vertical wall self supporting metal buildings and building constructions |
| US5359871A (en) * | 1992-04-22 | 1994-11-01 | M.I.C. Industries, Inc. | Microprocessor controlled apparatus and method for forming metal building panels |
| US5249445A (en) * | 1992-04-22 | 1993-10-05 | M.I.C. Industries, Inc. | Machine and method for forming arched roof vertical wall self supporting metal buildings |
| US6367302B1 (en) * | 2000-11-13 | 2002-04-09 | Hong Soon Park | Method for bending and cutting metal strip material |
| US8079244B2 (en) | 2006-03-08 | 2011-12-20 | Pro Form S.R.L. | Device and method for bending a metallic strip |
| CN108856381B (en) * | 2018-08-09 | 2024-02-02 | 株洲中车特种装备科技有限公司 | Pulley block transmission type bending machine |
-
1977
- 1977-11-24 CA CA291,713A patent/CA1066600A/en not_active Expired
-
1978
- 1978-11-07 GB GB7843534A patent/GB2008999B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2008999A (en) | 1979-06-13 |
| GB2008999B (en) | 1982-02-03 |
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