CA1125803A - Workpiece holding fixture - Google Patents
Workpiece holding fixtureInfo
- Publication number
- CA1125803A CA1125803A CA350,218A CA350218A CA1125803A CA 1125803 A CA1125803 A CA 1125803A CA 350218 A CA350218 A CA 350218A CA 1125803 A CA1125803 A CA 1125803A
- Authority
- CA
- Canada
- Prior art keywords
- holding fixture
- rotation
- axis
- workpiece
- disposed
- 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
Abstract
Abstract of the Disclosure A workpiece holding fixture in the form of an elongated cylindrical base member provided with an end adapted for mounting on the end of a rotatable spindle, such as the headstock of a lathe or like machine tool, the cylindrical member being provided at its other end with a seat appropriately arranged to engage a portion of the periphery of a workpiece of irregular shape, such as a pipe elbow or the like, and having clamping means for securely holding the workpiece on the seat with the portion of the workpiece on which a machining or fabricating operation is to be effected disposed rotatable through the intermediary of the holding fixture around an axis of rotation coinciding with the axis of rotation of the holding fixture.
Description
ll~S~03 w~3 There are many machining or fabricating operations .
requiring a workpiece of irregular shape to be held secuxely on a rotating support means, such that a portion o the workpiece i~
subjected to rotation about a predetermined axis of xotation.
When the wo.rkpiece has a regular ~hape, such as is the case for cylindrical workpieces, there i~ no par~icular probl m involved in holding the woxkpiece, ~or example, in the chucking headstocX
of a lathe or othex machine tool~ while effecting a acing opera-tion, cutting a tread, or the like on the other end o~ the work-piece, or placing a bead of welding material around the periphery -,~ ~
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¦ o~ the workpiece. ~wever, when the workpiece ha~ a shap~ other ¦ t:han a true cylindrical ~hape, BUCh a~, for example, when a ¦ workpiece i~ a pipe elbow, cson~iderable d.if~lcul'c~e~ are enco~n'cex ¦ ed in holding and centering the wor~piece ~uch as to ca~e ~e ¦ workpiece ~o rotate true aroun~ an a~i~ o~ rotation, w~ile ~ing ¦ 3ecurely held on the end o a rotatable ~pindle ~uc~ as a la'che ¦ head~tocac or ~he like.
A typical example o m~chining operation ox fabricating . ¦opera~ion in whic~ conventional ahucking ix~ures are inappropri~
¦ate is one invvlving ~olding securely a pipe elbow o~ ~he end of a rotatable ~pindle, for exampleO ~or f acing O beveling or ~hread-ing one end of ~he elbow orO more partiaularly, for welding on the end o~ the elbow a ~econd elb~w or a length of pipe by means I c>f an arc or flame welder held in a fixed po~ition~ ~he 1:wo ¦ member~ to be connected being rotated in clo~e proximity to the welder head As it i~ not po~sible` to hold a pipe elbow9 for example~
by way of conventional c~ucking ~ixture~, such as conventional lathe headstock chucks, holding flxtures have been contempla'ced in t~he past consi~iting of an angle plate mounted in the lathe chuck at an appropriate eccen~ri~ position~ and ~upporting ~he .
pipe elbow by ~ack welding ~he pipe elbow to ~he angle pla~e., Such an arrangemeIlt pre~ient~ ~nany inconve~ierlces~ he se~-up must be changed fc~r each size of pipe elb~w., Tack welding of the elb~w to ~he angle plate is a time-consuming and delicate operation whidh sequire~i 6hiseling ~r grinding to seE~ara'ce t~he
requiring a workpiece of irregular shape to be held secuxely on a rotating support means, such that a portion o the workpiece i~
subjected to rotation about a predetermined axis of xotation.
When the wo.rkpiece has a regular ~hape, such as is the case for cylindrical workpieces, there i~ no par~icular probl m involved in holding the woxkpiece, ~or example, in the chucking headstocX
of a lathe or othex machine tool~ while effecting a acing opera-tion, cutting a tread, or the like on the other end o~ the work-piece, or placing a bead of welding material around the periphery -,~ ~
~1 '.
I
-~ ~ c-) ~9~ r~
.IL ~.~J~
¦ o~ the workpiece. ~wever, when the workpiece ha~ a shap~ other ¦ t:han a true cylindrical ~hape, BUCh a~, for example, when a ¦ workpiece i~ a pipe elbow, cson~iderable d.if~lcul'c~e~ are enco~n'cex ¦ ed in holding and centering the wor~piece ~uch as to ca~e ~e ¦ workpiece ~o rotate true aroun~ an a~i~ o~ rotation, w~ile ~ing ¦ 3ecurely held on the end o a rotatable ~pindle ~uc~ as a la'che ¦ head~tocac or ~he like.
A typical example o m~chining operation ox fabricating . ¦opera~ion in whic~ conventional ahucking ix~ures are inappropri~
¦ate is one invvlving ~olding securely a pipe elbow o~ ~he end of a rotatable ~pindle, for exampleO ~or f acing O beveling or ~hread-ing one end of ~he elbow orO more partiaularly, for welding on the end o~ the elbow a ~econd elb~w or a length of pipe by means I c>f an arc or flame welder held in a fixed po~ition~ ~he 1:wo ¦ member~ to be connected being rotated in clo~e proximity to the welder head As it i~ not po~sible` to hold a pipe elbow9 for example~
by way of conventional c~ucking ~ixture~, such as conventional lathe headstock chucks, holding flxtures have been contempla'ced in t~he past consi~iting of an angle plate mounted in the lathe chuck at an appropriate eccen~ri~ position~ and ~upporting ~he .
pipe elbow by ~ack welding ~he pipe elbow to ~he angle pla~e., Such an arrangemeIlt pre~ient~ ~nany inconve~ierlces~ he se~-up must be changed fc~r each size of pipe elb~w., Tack welding of the elb~w to ~he angle plate is a time-consuming and delicate operation whidh sequire~i 6hiseling ~r grinding to seE~ara'ce t~he
-2~
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~ ~l elbow ~rom the an~le plate at the ~nd o~ ~he machinlng or , fabricating operation. In addit~on, the ~urace o~ the elb~w .
iq marred, ~truatural integrity o~ tlle workpiece i~ jeop~rdized and,when part specifications call for a part~culax m~tallu~gical . 5 compo~ition o~ the elbo~ material~ ~uch a3 ~or ~me ~aînle~
steel materials, con~amination o~ the material may occur throug~
transfer of mate~ial- from ~he angle plate or due to the compo~i-- tion o~ the weld u~ed ~or tack we~ding. Furthermore, non-metallic pipe elbcw cannot ~e read~ly held in the fixture by tacX
weldingO
It is also rea~ily apparent that the ho7ding ~trength ia dependent on the ~uality of the tack welding~ and that it may happen that the taak weld breaks during a madhining operationO
.. ~
The disàdvantage ànd in~onvenierlce~ o the prior art are .
eliminated by the pre~ent inventi :>n ~ w~ich provide3 an aligning an h~ lding ~ixture for an irregularly shaped workpiece, ~u~h as pipe elbow~ and the like, ~or mounting su~h workpiece in a conven-tional chucking arrangement or holding mean~, and permitting the 20 end or the portion of the workpiece on whic~h a machining or fabricatislg operation is to be efected to be ac~urately aligned .
around a predetermined axis of rotation, ~ich provides s~urdy. .
clamping of l~he workpiece in po3iltion and which permits rapid s:lamping and unclamping of~ ffie workpiece. ~he pre~ent inventio accompli~he its purpose~ by mean~ of a holding ixt:ure in the ~orm o~ a aylindri~al member p~ovided at one end wi~h an ~~. .
~ ' .
~ ~ ~
appropriately angled and shaped ~eat portion enca~ing ~ por'cion ----- ~of the periphery o~ the workpiece, and wi1,h manually opera~le clamp means in the form o~ a link chain, strap or 'ch~ liXe capable o bein~ wrapped about a corre~ponding pc~rtion o~ t~e S workpiece peripheral surface. q!he end o th~ clamp mean~ i~
provided with a ~hreaded mem1~er engageable between t~e branches , of a bifurcated bracket. A female threaded member provided with manual grasping means, 8uch as a T-handle or ~e like ~ i~
threaded over t~e male ~hreaded me~er for dra~ing in t}~e clamp-ing link chain or strap against t~he ~ur~ace o lthe w~rkpiece wi~h enough pressure to hold ~he lat~er securely in position on the holder seat.
. q~he diver e object~ and advantage~ of the invention will become apparent to tho8e skilled in the art when the follo~ing description of ~ome of the ~t mode~ oontempla'ced for practicing ~he invention is read in conju~ction with the ac!companying .
d.rawing wherein-. _.... _., ... __ ............ ., , _ _ .. - .. ...
FI&. 1 is a perspective view of an example o~ holding 2~ f~xture for irregular ~hape workpiece according to the pre ent invention, mounted for rotation by a conventional ohucking device;
FIG. 2 is a side elevation view ~hereo~, ~howing a workpiece clamped on the end o~ the ix~ure;
2 5 FIG . 3 i~ a sec:tioll ~hexeof along line 3 -3 of ~IG . 2;
F~G ~ 4 is a ~ imilar ~o FIG. 3 but shawing a modif ica ~
tiorl 1~hereo ~ and . .
~1 . .
~ --~ ZS~3~3 ... .. , . . I
¦ FIG. S i~ a view ~rom line 5-5 of FIG. 4. . , I ~eferring naw 'co the drawing, and more pa~ti¢ulaxly to ¦FIG. 1 thereo, an example o~ wor~piece ~uppor~ ~ix~ure 10 ¦according to the present invention comprises an elongated membe~
¦or mandrel 12, aircularly cylindrical and pre~exably tubular ¦ having an end 14 ~or remova~le mounting be'cween t~ jaw~ 16 o~
¦ a conventional ahucking device 18, ~uc:~ as the headstoc3c chuck 1 of a machine lathe or t~he like. i~he cylind~ al member or mandre 10 ~ 12, when mounted in the c:huc~ing devi e 18 i~ adap~ed 'co be l rotated thereby concentric about a rotation axis, shswn by dot ¦ and dash line 20 a~ FIG. 2 .
q~he free end 22 of the cyiindrical member or mandrel 12 I i5 cut along a pla~e di~posed generally at 45O with the longitu-¦ dinal axis 20 o~ rotation of ~he cylindrical member or mandrel 12, and thu3 forms an annular ~ur~ace, generally ellipsoidal in plane projection, de~ining a sealt 24 whic~ i~ preferably æhaped ` ¦ slightly concave as ~hown at 26 to ensure better engagement ¦ with a convex peripheral ~urface porSion of a wor~piece, such a~
¦ a workpiece 28, FI~S. 2 and 3.
The illustra~ed workpiece 28 i~ a 90 tubular or pipe elbow 30~ l~he tllbular el~ow 30 i~ held in position on the.~eat 24 on the end of the cylindrical m~mber or mandrel 12 by mean~ of an adjustable clamp mechani~m 32 which~ a~ trated at E~IGS. 1-3, consists of a llnk chain 34 hingedly conn~cted at one end to a block 369 FI~5. 1 as~d 3, by m~an~ o~ pivo~ pin 37. ~e blc:~c~c 36 .
-S~ .
- 11 . ........ ......
~ )3 ¦ i~ welded, for example, to the peripheral sur~ce o the cylind~1-¦ cal member or mandrel 12 at an appropriate loca~ion proximate ¦ the seat 24, such tha~ the plane of :bending o~ the lin~c c~ain 3 ¦ i~ ~ubstarltially or~hogonal ~co ~he ~eneral plane o:e the eç!at ~4.
S ¦ The free end of the link c~a:in 34 i~ provided with a ~hreaded ~tuc ¦ 38 hinged thereon, a3 ~hown at 40. ~ ~emale member Qr ~leeve 1 42 t:hread~ on the end of the threaded 8tud 38. For that purpo~e, ¦ the ~leeve 42 is internally ~readed or~ alters~atively, arld as l illustrated in ~he drawing, the sleeve 42 may be provided on an ¦ end with a nut 44 welded ~ereon, which alone engag~ t~he t~read f the threaded stud 38, the other end of ~he ~leeve 42 being provided wi~h a T-ha~dle ~5 for manual grasp ~n aligned b~x brackek 46 i~ welded on the pèripl~ery of the cylindrical mem ~ r I or mandrel 12 proximate the ~eat 24, and the box braeket ~6 is .
¦ provided with a baqe plate 48 having a ~lot 50 a~ceptir~g the .
¦ threaded ~tud 38 there~hrough.
When it i8 desired to place a workpiece 28 suc~h a~ the pipe elbow 3û in ~he holding ixture lO~ t~he pipe elb~w 30 is . I positioned on the seat 24 in the position ~hown at FIG. 2, the 1 hinged link chain 34 i3 wrapped around 'che peripheral ~ur~ace of the pipe el}~ow and the threaded stud 38 i5 engaged in the slot :
50 of the face plate 48 of ~he b~x bracXec 46.. ~he T~handle 45 i8 rotated 8UCll a~ to draw the threaded ~tud 38 and ~u~ apply I the link chain 34 tightly around the periphery o~ th~ p~pe elbow 30. The ?ipe elbow 3û may be s:~lamped on the seat 24 on the end o~ the holding ~ixture 10 with only enougl~ pre~sure ~o allow .
- ~
~ .
, l IJ () () . -- I . . , ~ligh~ lateral and longitudinal adjustment, a~ i8 generally done when clamping a cylindrical workpiece in the c~ua~ing mem~er o~
la machine ~athe, to en~ure that; for example, the end ~or~ion 51 ¦of the pipe elbow 30 rotates true relative to the axis 20 sf ¦rotation. Appropri.ate positioning gauges or rest~ may be used to ~implify and make speedier the centering operation. Once th~
pipe elbow 30 i~ appxopriately centered, by rotating ~he T-~andle 45 addi~ional clamping pres-~ure may be exerted ~o ~ecurely hold . ¦it on the eat 24.
¦ ~fter the workpiece 28, such a3 the pi~e elbow 30, is securely and precisely mounted on the end of the holding ~ixture ¦ 10, any appropriate ma~hining operation, 5uch as ~acing, thread-¦ ing, chamfering, or knurling may be effected on the end o~ the .
I elbow b~ appropriate tool~, while rotating ~e holding fixture 10 - 15 ¦ around its.~axis o~ rotation 20. It can alQo be seen ~hat the l holding and aligning fixture 10 o ~he invention may be u~ed for ¦ holding an irregular shape workpiece such as the elbow 30, in ¦ alignment wi~h~ ~or example, a length of pipe~52, shown in phanto~
I line at FIG. 2. By rotating the pipe elbow 30 and th~ len~h of ¦ pipe 52 in unison, a weld bead may be deposited at thP junction between the ~wo parts by mean~ of a ~tati~nary welding head.
The other end o the length of pipe 52 may be held in a rotatable chucking mechanism, not sho~n~ rotated in uni~on with the chuckiny mechanism 18 holding the holding fixture 10. In t~e .
25 alternative, ~he leng~h of pipe 52, supported by appropriate re~t3, may b~ al~gned wit:h 'che axi~ 20 sf rotation, and ta~k , . ` , ' .
Il . ' ' ' . .
.
... ~ ..... . .... ..
~1~S~303 welded to the end 51 o~ the pipe elkow 30, prior to ~eing rotated in uni~on with the holding i~ture 10 a full xevolution rotati~n, or any number o~ re~uired revolution~, o~ applying an app~opria~
weld bead at the junction be~ween ~he part~. Wh~n the o~h~x ¢nd of ~he length o~ pipe i8 already provided with a~ elb~w, o~
where it i~ de~ired to weld together end to ~nd two elba~, t~e o~her elbow may be held in a rotatable chucking mec~ani~m by mean~ o~ second holding fix ure 10.
~ s an alternate ~tructure, ~he link chain 34 may be replaced ~y a strap, ei~her ~lexible ~uc~ a~ to wrap firmly around She exposed peripheral surfa~e of ~he workpiece, or rigid a~ he rigid U-~haped strap 53 o~ FIGS. 4-S, hinged at one end to a support block 37" and provided on it~ other end with a threaded stud 38 having a bifurcated end 54 connected to the ~trap 53 by means o~ a hinging pin 55~, ~he remaining etructuxe being the same a~ hereinbe~ore explained in detail~ The inner sur~ace o~ ~he strap 53 may engage directly the peripheral ~
3urface o~ the pipe elbow 30, or, a~ ~hown at F~G. 4, it may be .
provided with a plurality of peds 56 for engaging such peripheral ~ur~ac~. The pads 56 may be made of so~t material or may be made .
c~f material-e having the same composition a~ ~he material making. u~ , the pipe elbow 30, such as to avoid contamination of the material o~ the pipe elbow when the elb~w i~ heated during welding,, where ContamirlatiQn i8 'CO be avoided a~, for ex~mple, while a}: rica t:i ng a piping ~ystem fox critical chemiæa} or refine~in~tallations, 8~
' 11 , ' ~
~- ~
ZS~30~ -¦ Although the holding fLxture 10 ha~been ~escribed and ¦ illu~trated as comprising a tubular member 12 o constant diame~
~er ~ro3r~ end to end, ~t will be apprec:Lated that where lt i~
~ desired to manuacture holding ~lxture~ ~or holdlrlg wo~piec~s I of large 3iæes, and the opening of the chuc~ing mec~ani~m holdin~
¦ the ~ixture is limited, a tubular or mas~ive cylindrical member l o~ a diameter which can be accon~nodated by the ~ihucking mechanism ¦ i9 provided on it8 end w~.th a tubular member o~ larger diameter ¦welded or o~herwise astened thereon, the tubular member o~
. 10 ¦ largex diame~cer beingO in turn provided with thP appropriate seat 24 ;Eor recelving and holding in clamping a~rangement a workpiece of irregular ~hape. It will al80 be readily appreciated that the principle o~ ~he invention i9 adaptable to holding workpieces l other than 90 elbows, such a~, for example elbow~ o~ angles .
¦ othex ~han 900 and other irregular ~hape wor~pieces the orien-tation o~ ~he ~everal plane of She workpiece receiviny seat being a function of the shape o t~e workpiecè and of ~he alig~ment l o-the portion o~ the workpiece which it is desired to rotate ¦ concentria to a predetermined axi~ of rotation.-----~
~aving thus de~c~be~e~inven~ion by way of examplQs -o~-~-s~tructural embodiment t~hereof~, modificatiorls whereo~ will he.
apparent ts~ thos~ skilled in ~he ar~, wh t i~ claimed as new i~
as ollcws.
~"~9_ , .
Il `, , , . ,
~ ~ o ~
~2S~
~ ~l elbow ~rom the an~le plate at the ~nd o~ ~he machinlng or , fabricating operation. In addit~on, the ~urace o~ the elb~w .
iq marred, ~truatural integrity o~ tlle workpiece i~ jeop~rdized and,when part specifications call for a part~culax m~tallu~gical . 5 compo~ition o~ the elbo~ material~ ~uch a3 ~or ~me ~aînle~
steel materials, con~amination o~ the material may occur throug~
transfer of mate~ial- from ~he angle plate or due to the compo~i-- tion o~ the weld u~ed ~or tack we~ding. Furthermore, non-metallic pipe elbcw cannot ~e read~ly held in the fixture by tacX
weldingO
It is also rea~ily apparent that the ho7ding ~trength ia dependent on the ~uality of the tack welding~ and that it may happen that the taak weld breaks during a madhining operationO
.. ~
The disàdvantage ànd in~onvenierlce~ o the prior art are .
eliminated by the pre~ent inventi :>n ~ w~ich provide3 an aligning an h~ lding ~ixture for an irregularly shaped workpiece, ~u~h as pipe elbow~ and the like, ~or mounting su~h workpiece in a conven-tional chucking arrangement or holding mean~, and permitting the 20 end or the portion of the workpiece on whic~h a machining or fabricatislg operation is to be efected to be ac~urately aligned .
around a predetermined axis of rotation, ~ich provides s~urdy. .
clamping of l~he workpiece in po3iltion and which permits rapid s:lamping and unclamping of~ ffie workpiece. ~he pre~ent inventio accompli~he its purpose~ by mean~ of a holding ixt:ure in the ~orm o~ a aylindri~al member p~ovided at one end wi~h an ~~. .
~ ' .
~ ~ ~
appropriately angled and shaped ~eat portion enca~ing ~ por'cion ----- ~of the periphery o~ the workpiece, and wi1,h manually opera~le clamp means in the form o~ a link chain, strap or 'ch~ liXe capable o bein~ wrapped about a corre~ponding pc~rtion o~ t~e S workpiece peripheral surface. q!he end o th~ clamp mean~ i~
provided with a ~hreaded mem1~er engageable between t~e branches , of a bifurcated bracket. A female threaded member provided with manual grasping means, 8uch as a T-handle or ~e like ~ i~
threaded over t~e male ~hreaded me~er for dra~ing in t}~e clamp-ing link chain or strap against t~he ~ur~ace o lthe w~rkpiece wi~h enough pressure to hold ~he lat~er securely in position on the holder seat.
. q~he diver e object~ and advantage~ of the invention will become apparent to tho8e skilled in the art when the follo~ing description of ~ome of the ~t mode~ oontempla'ced for practicing ~he invention is read in conju~ction with the ac!companying .
d.rawing wherein-. _.... _., ... __ ............ ., , _ _ .. - .. ...
FI&. 1 is a perspective view of an example o~ holding 2~ f~xture for irregular ~hape workpiece according to the pre ent invention, mounted for rotation by a conventional ohucking device;
FIG. 2 is a side elevation view ~hereo~, ~howing a workpiece clamped on the end o~ the ix~ure;
2 5 FIG . 3 i~ a sec:tioll ~hexeof along line 3 -3 of ~IG . 2;
F~G ~ 4 is a ~ imilar ~o FIG. 3 but shawing a modif ica ~
tiorl 1~hereo ~ and . .
~1 . .
~ --~ ZS~3~3 ... .. , . . I
¦ FIG. S i~ a view ~rom line 5-5 of FIG. 4. . , I ~eferring naw 'co the drawing, and more pa~ti¢ulaxly to ¦FIG. 1 thereo, an example o~ wor~piece ~uppor~ ~ix~ure 10 ¦according to the present invention comprises an elongated membe~
¦or mandrel 12, aircularly cylindrical and pre~exably tubular ¦ having an end 14 ~or remova~le mounting be'cween t~ jaw~ 16 o~
¦ a conventional ahucking device 18, ~uc:~ as the headstoc3c chuck 1 of a machine lathe or t~he like. i~he cylind~ al member or mandre 10 ~ 12, when mounted in the c:huc~ing devi e 18 i~ adap~ed 'co be l rotated thereby concentric about a rotation axis, shswn by dot ¦ and dash line 20 a~ FIG. 2 .
q~he free end 22 of the cyiindrical member or mandrel 12 I i5 cut along a pla~e di~posed generally at 45O with the longitu-¦ dinal axis 20 o~ rotation of ~he cylindrical member or mandrel 12, and thu3 forms an annular ~ur~ace, generally ellipsoidal in plane projection, de~ining a sealt 24 whic~ i~ preferably æhaped ` ¦ slightly concave as ~hown at 26 to ensure better engagement ¦ with a convex peripheral ~urface porSion of a wor~piece, such a~
¦ a workpiece 28, FI~S. 2 and 3.
The illustra~ed workpiece 28 i~ a 90 tubular or pipe elbow 30~ l~he tllbular el~ow 30 i~ held in position on the.~eat 24 on the end of the cylindrical m~mber or mandrel 12 by mean~ of an adjustable clamp mechani~m 32 which~ a~ trated at E~IGS. 1-3, consists of a llnk chain 34 hingedly conn~cted at one end to a block 369 FI~5. 1 as~d 3, by m~an~ o~ pivo~ pin 37. ~e blc:~c~c 36 .
-S~ .
- 11 . ........ ......
~ )3 ¦ i~ welded, for example, to the peripheral sur~ce o the cylind~1-¦ cal member or mandrel 12 at an appropriate loca~ion proximate ¦ the seat 24, such tha~ the plane of :bending o~ the lin~c c~ain 3 ¦ i~ ~ubstarltially or~hogonal ~co ~he ~eneral plane o:e the eç!at ~4.
S ¦ The free end of the link c~a:in 34 i~ provided with a ~hreaded ~tuc ¦ 38 hinged thereon, a3 ~hown at 40. ~ ~emale member Qr ~leeve 1 42 t:hread~ on the end of the threaded 8tud 38. For that purpo~e, ¦ the ~leeve 42 is internally ~readed or~ alters~atively, arld as l illustrated in ~he drawing, the sleeve 42 may be provided on an ¦ end with a nut 44 welded ~ereon, which alone engag~ t~he t~read f the threaded stud 38, the other end of ~he ~leeve 42 being provided wi~h a T-ha~dle ~5 for manual grasp ~n aligned b~x brackek 46 i~ welded on the pèripl~ery of the cylindrical mem ~ r I or mandrel 12 proximate the ~eat 24, and the box braeket ~6 is .
¦ provided with a baqe plate 48 having a ~lot 50 a~ceptir~g the .
¦ threaded ~tud 38 there~hrough.
When it i8 desired to place a workpiece 28 suc~h a~ the pipe elbow 3û in ~he holding ixture lO~ t~he pipe elb~w 30 is . I positioned on the seat 24 in the position ~hown at FIG. 2, the 1 hinged link chain 34 i3 wrapped around 'che peripheral ~ur~ace of the pipe el}~ow and the threaded stud 38 i5 engaged in the slot :
50 of the face plate 48 of ~he b~x bracXec 46.. ~he T~handle 45 i8 rotated 8UCll a~ to draw the threaded ~tud 38 and ~u~ apply I the link chain 34 tightly around the periphery o~ th~ p~pe elbow 30. The ?ipe elbow 3û may be s:~lamped on the seat 24 on the end o~ the holding ~ixture 10 with only enougl~ pre~sure ~o allow .
- ~
~ .
, l IJ () () . -- I . . , ~ligh~ lateral and longitudinal adjustment, a~ i8 generally done when clamping a cylindrical workpiece in the c~ua~ing mem~er o~
la machine ~athe, to en~ure that; for example, the end ~or~ion 51 ¦of the pipe elbow 30 rotates true relative to the axis 20 sf ¦rotation. Appropri.ate positioning gauges or rest~ may be used to ~implify and make speedier the centering operation. Once th~
pipe elbow 30 i~ appxopriately centered, by rotating ~he T-~andle 45 addi~ional clamping pres-~ure may be exerted ~o ~ecurely hold . ¦it on the eat 24.
¦ ~fter the workpiece 28, such a3 the pi~e elbow 30, is securely and precisely mounted on the end of the holding ~ixture ¦ 10, any appropriate ma~hining operation, 5uch as ~acing, thread-¦ ing, chamfering, or knurling may be effected on the end o~ the .
I elbow b~ appropriate tool~, while rotating ~e holding fixture 10 - 15 ¦ around its.~axis o~ rotation 20. It can alQo be seen ~hat the l holding and aligning fixture 10 o ~he invention may be u~ed for ¦ holding an irregular shape workpiece such as the elbow 30, in ¦ alignment wi~h~ ~or example, a length of pipe~52, shown in phanto~
I line at FIG. 2. By rotating the pipe elbow 30 and th~ len~h of ¦ pipe 52 in unison, a weld bead may be deposited at thP junction between the ~wo parts by mean~ of a ~tati~nary welding head.
The other end o the length of pipe 52 may be held in a rotatable chucking mechanism, not sho~n~ rotated in uni~on with the chuckiny mechanism 18 holding the holding fixture 10. In t~e .
25 alternative, ~he leng~h of pipe 52, supported by appropriate re~t3, may b~ al~gned wit:h 'che axi~ 20 sf rotation, and ta~k , . ` , ' .
Il . ' ' ' . .
.
... ~ ..... . .... ..
~1~S~303 welded to the end 51 o~ the pipe elkow 30, prior to ~eing rotated in uni~on with the holding i~ture 10 a full xevolution rotati~n, or any number o~ re~uired revolution~, o~ applying an app~opria~
weld bead at the junction be~ween ~he part~. Wh~n the o~h~x ¢nd of ~he length o~ pipe i8 already provided with a~ elb~w, o~
where it i~ de~ired to weld together end to ~nd two elba~, t~e o~her elbow may be held in a rotatable chucking mec~ani~m by mean~ o~ second holding fix ure 10.
~ s an alternate ~tructure, ~he link chain 34 may be replaced ~y a strap, ei~her ~lexible ~uc~ a~ to wrap firmly around She exposed peripheral surfa~e of ~he workpiece, or rigid a~ he rigid U-~haped strap 53 o~ FIGS. 4-S, hinged at one end to a support block 37" and provided on it~ other end with a threaded stud 38 having a bifurcated end 54 connected to the ~trap 53 by means o~ a hinging pin 55~, ~he remaining etructuxe being the same a~ hereinbe~ore explained in detail~ The inner sur~ace o~ ~he strap 53 may engage directly the peripheral ~
3urface o~ the pipe elbow 30, or, a~ ~hown at F~G. 4, it may be .
provided with a plurality of peds 56 for engaging such peripheral ~ur~ac~. The pads 56 may be made of so~t material or may be made .
c~f material-e having the same composition a~ ~he material making. u~ , the pipe elbow 30, such as to avoid contamination of the material o~ the pipe elbow when the elb~w i~ heated during welding,, where ContamirlatiQn i8 'CO be avoided a~, for ex~mple, while a}: rica t:i ng a piping ~ystem fox critical chemiæa} or refine~in~tallations, 8~
' 11 , ' ~
~- ~
ZS~30~ -¦ Although the holding fLxture 10 ha~been ~escribed and ¦ illu~trated as comprising a tubular member 12 o constant diame~
~er ~ro3r~ end to end, ~t will be apprec:Lated that where lt i~
~ desired to manuacture holding ~lxture~ ~or holdlrlg wo~piec~s I of large 3iæes, and the opening of the chuc~ing mec~ani~m holdin~
¦ the ~ixture is limited, a tubular or mas~ive cylindrical member l o~ a diameter which can be accon~nodated by the ~ihucking mechanism ¦ i9 provided on it8 end w~.th a tubular member o~ larger diameter ¦welded or o~herwise astened thereon, the tubular member o~
. 10 ¦ largex diame~cer beingO in turn provided with thP appropriate seat 24 ;Eor recelving and holding in clamping a~rangement a workpiece of irregular ~hape. It will al80 be readily appreciated that the principle o~ ~he invention i9 adaptable to holding workpieces l other than 90 elbows, such a~, for example elbow~ o~ angles .
¦ othex ~han 900 and other irregular ~hape wor~pieces the orien-tation o~ ~he ~everal plane of She workpiece receiviny seat being a function of the shape o t~e workpiecè and of ~he alig~ment l o-the portion o~ the workpiece which it is desired to rotate ¦ concentria to a predetermined axi~ of rotation.-----~
~aving thus de~c~be~e~inven~ion by way of examplQs -o~-~-s~tructural embodiment t~hereof~, modificatiorls whereo~ will he.
apparent ts~ thos~ skilled in ~he ar~, wh t i~ claimed as new i~
as ollcws.
~"~9_ , .
Il `, , , . ,
Claims (16)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A holding fixture for mounting in a chucking member an irregularly shaped workpiece with a portion thereof on which an operation is to be effected disposed concentric to a predetermined axis of rotation corresponding to the normal axis of rotation of said chucking member, said holding fixture comprising a cylindrical member mounted in said chucking member and having an axis of rotation corresponding to the axis of rotation of said chucking member and a seating face on the end of said cylindrical member for engagement with a portion of the peripheral surface of said workpiece, said seating face being generally disposed in a plane forming an angle with said axis of rotation causing said portion of said workpiece on which an operation is to be effected to be aligned concentric with said axis of rotation, and means clamping said workpiece in position on said seating face, wherein said clamping means comprises a link chain hingedly attached at one end to a portion of said cylindrical member proximate said seating face, a male threaded member hingedly affixed to the other end of said link chain, a bracket fixedly attached to a portion of said cylindrical member proximate said seating face, an aperture in said bracket for passing therethrough said male threaded member, and a female threaded member disposed on the other side of said bracket threadingly engaged on the end of the male threaded member.
2. The holding fixture of claim 1 wherein said aperture is in the form of a slot enabling said male threaded member to be engaged in said slot without removing said female threaded member.
3. The holding fixture of claim 2 wherein said female threaded member is a tubular sleeve having an internally threaded end engaging said male threaded member and a T-handle on the other end.
4. A holding fixture for mounting in a chucking member an irregularly shaped workpiece with a portion thereof on which an operation is to be effective disposed concentric to a predetermined axis of rotation corresponding to the normal axis of rotation of said chucking member, said holding fixture comprising a cylindrical member mounted in said chucking member and having an axis of rotation corresponding to the axis of rotation of said chucking member and a seating face on the end of said cylindrical member for engagement with a portion of the peripheral surface of said workpiece, said seating face being generally disposed in a plane forming an angle with said axis of rotation causing said portion of said workpiece on which an operation is to be effected to be aligned concentric with said axis of rotation, and means clamping said workpiece in position on said seating face, wherein said clamping means comprises a strap hinged at one end to a portion of said cylindrical member proximate said seating face, a bracket fixedly attached to another portion of said cylindrical member proximate said seating face, an aperture in said bracket, a male threaded member hingedly mounted on the other end of said strap, and a female threaded member disposed on the other side of said bracket and threadably engageable with said male threaded member.
5. The holding fixture of claim 4 wherein said aperture is in the form of a slot enabling said male threaded member to be engaged in said slot without removing said female threaded member.
6. The holding fixture of claim 5 wherein said female threaded member is a tubular sleeve having an internally threaded end engaging said male threaded member and a T-handle on the other end.
7. The holding fixture of claim 4 further comprising pads disposed on the surface of said strap engageable with said workpiece.
8. The holding fixture of claim 4 wherein said strap is a substantially rigid U-shaped member.
9. A holding fixture for holding in a chucking member an elbow-shaped workpiece with an end thereof rotatable around a predetermined axis of rotation corresponding to the normal axis of rotation of said chucking member, said holding fixture comprising a cylindrical base member having an end removably attached to said chucking member a generally annularly disposed seat formed on the other end of said cylindrical member, said seat being in the from of an annular face disposed generally in a plane angularly disposed relative to said axis of rotation, and means clamping said elbow on said seat by partial peripheral engagement therewith for engaging a portion of the surface of said elbow with the surface of said seat, the angle formed between said plane and said axis of rotation being such that the end face of said elbow is disposed concentric to said axis of rotation.
10. The holding fixture of claim 9 wherein said clamping means comprises strap means generally disposed in a second plane substantially perpendicular to the plane of said seat, hinge means pivotally attaching an end of said strap means to said member proximate said seat, and means removably fastening the other end of said strap means to said member proximate said seat.
11. The holding fixture of claim 10 wherein said strap means is a link chain.
12. The holding fixture of claim 10 wherein said strap means is a substantially rigid U-shaped member.
13. The holding fixture of claim 10 further comprising a plurality of pad attached to said strap means and disposed for engagement with a portion of the peripheral surface of said elbow.
14. The holding fixture of claim 10 wherein said means for releasably attaching the end of said strap means comprises a male threaded member hingedly mounted on the other end of said strap means, a bracket permanently attached to said member, an aperture in said bracket for passage therethrough of said male threaded member, and a threaded female member threadably engageable with said male threaded member passed through said aperture in said bracket.
15. The holding fixture of claim 14 wherein said aperture is a slot open at one end of said bracket.
16. The holding fixture of claim 14 wherein said female threaded member is a sleeve threaded at one end and provided with a T-handle at the other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA350,218A CA1125803A (en) | 1980-04-18 | 1980-04-18 | Workpiece holding fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA350,218A CA1125803A (en) | 1980-04-18 | 1980-04-18 | Workpiece holding fixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1125803A true CA1125803A (en) | 1982-06-15 |
Family
ID=4116742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA350,218A Expired CA1125803A (en) | 1980-04-18 | 1980-04-18 | Workpiece holding fixture |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1125803A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110434640A (en) * | 2019-09-03 | 2019-11-12 | 新乡瑞新金属制品有限公司 | Arm support clamp for machining before combine harvester |
| CN111906744A (en) * | 2020-08-11 | 2020-11-10 | 阜阳卷烟材料厂 | Coil stock placing device convenient for replacing coil stock |
| CN114043274A (en) * | 2021-10-26 | 2022-02-15 | 中广核工程有限公司 | Automatic transposition elbow positioner |
-
1980
- 1980-04-18 CA CA350,218A patent/CA1125803A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110434640A (en) * | 2019-09-03 | 2019-11-12 | 新乡瑞新金属制品有限公司 | Arm support clamp for machining before combine harvester |
| CN111906744A (en) * | 2020-08-11 | 2020-11-10 | 阜阳卷烟材料厂 | Coil stock placing device convenient for replacing coil stock |
| CN114043274A (en) * | 2021-10-26 | 2022-02-15 | 中广核工程有限公司 | Automatic transposition elbow positioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |