CA1105661A - Method of making a seal nut - Google Patents
Method of making a seal nutInfo
- Publication number
- CA1105661A CA1105661A CA317,890A CA317890A CA1105661A CA 1105661 A CA1105661 A CA 1105661A CA 317890 A CA317890 A CA 317890A CA 1105661 A CA1105661 A CA 1105661A
- Authority
- CA
- Canada
- Prior art keywords
- nut
- counterbore
- bearing surface
- sealing ring
- diameter
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000003754 machining Methods 0.000 abstract description 5
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- PEQMJVGRHNZPAM-UHFFFAOYSA-N 1,4-dichloro-2-isocyanatobenzene Chemical compound ClC1=CC=C(Cl)C(N=C=O)=C1 PEQMJVGRHNZPAM-UHFFFAOYSA-N 0.000 description 1
- 101100130592 Caenorhabditis elegans mlc-4 gene Proteins 0.000 description 1
- 241000905957 Channa melasoma Species 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/64—Making machine elements nuts
- B21K1/70—Making machine elements nuts of special shape, e.g. self-locking nuts, wing nuts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/004—Sealing; Insulation
Abstract
METHOD OF MAKING A SEAL NUT
ABSTRACT OF THE DISCLOSURE
An improved method of manufacturing a sealing nut having a sealing ring insert is disclosed. The process eliminates the costly step of machining an undercut into the counterbore of the nut blank to provide a means for retaining the sealing ring in place.
This is accomplished by leaving a predetermined amount of excess material protruding around the periphery of the counterbore when the counterbore is initially cold formed. When the bearing surface is subsequently flattened by an additional cold forming step, the excess material is forced radially inwardly thereby reducing slightly the diameter of the counterbore at the bearing surface of the nut.
The elimination of the undercutting operation also results in a nut having improved torque and load bearing characteristics.
ABSTRACT OF THE DISCLOSURE
An improved method of manufacturing a sealing nut having a sealing ring insert is disclosed. The process eliminates the costly step of machining an undercut into the counterbore of the nut blank to provide a means for retaining the sealing ring in place.
This is accomplished by leaving a predetermined amount of excess material protruding around the periphery of the counterbore when the counterbore is initially cold formed. When the bearing surface is subsequently flattened by an additional cold forming step, the excess material is forced radially inwardly thereby reducing slightly the diameter of the counterbore at the bearing surface of the nut.
The elimination of the undercutting operation also results in a nut having improved torque and load bearing characteristics.
Description
~51~i6~
BACKGROUND ~ND SUMMARY OF THE INVENTION
-The present invention relates to a fluid-sealing nut and in particular to an improved method of making the same.
Sealing nuts of the present type are commonly used in the aircraft industry wherein many aircraf-t are designed with "wet" wings which require that the fasteners utilized in the wings form a fluid-tight seal. Currently, the most widely used type of sealing nut in the aircraft industry comprises a nut having an annular deformable sealing ring inserted into a counterbore cut into the bearing surface of the nut. Typically, the sealing ring is designed to protrude above the bearing surface of the nut so that when the nut is torqued down against the workpiece, the sealing ring is deformed inwardly into the threads on the shank of the bolt thereby formin~ a fluid-tight seal.
Sealing nuts oE this type are generally made by a process whereby a counterbore is cold formed into the bearing surface of the nut and then an undercut is machined into the side walls of the counterbore to provide a means for retaining the sealing ring in place. The disadvantage of this process is that the undercut requires a separate machining operation which slows the production rate of the sealing nuts and hence significantly increases cost.
Moreover, as with all cutting operations, the undercut surface creates a weakened stress point in the nut which restricts the torque and load limits of the nut.
The present invention seeks to eliminate these disadvantages by providing a new and improved method of making the above-described sealing nut. In particular, utilizing the method of the present 28 invention, when the nut is initially cold formed according to ., ~
rw/~l~
,: ;,: .
.. . . . . .
~S~631 conventional practice, a protruding ridge of excess material is purposefully retained around the periphery o the counter-bore. When the nut is then cold formed a second time ko smooth the bearing surface of the nut, the excess material is forced inwardly, thereby reducing slightly the surface diameter of the counterbore. In this manner, a means for retaining the sealing ring is created without requirinq a separate machining operation and without weakening the structure of the nut. In fact, as will subsequently be 10~ explained in greater detail, the cold forminq process of the present invention actually strengthens the load bearing surface of the nut. Thus, the resulting sealinq nut produced is not only less costly to manufacture but is also a better quality nut.
The present invention is defined as a method of making a seal nut comprising a body having a load bearing surface and a sealing ring disposed within a counterbore in the bearing surface of said body, the method comprising the steps of: forming the body of the nut; cold forming the counterbore in the bearing surface of the body so as to retain a circular ridge of excess material protruding above the bearing surface around the periphery of the counterbore, cold forming the bearing surface to 1atten the surface and force the excess material radially inwardly; and thereafter inserting the sealing ring into the counterbore.
Additional objects and advantages of the present invention will become apparent from a readinq of the detailed 28 description of the rw/ - 2 -- :~
r ~ 566~
prc~crrc~l cmbo~llmcnt whlch m:~lce rcfcrcncc to thc followlng ~ot of dr;lwln~ In w hlch: , , nRlET~' D~3SCI~Ir-'TlON OIi' TTIE' l~RAWINC:S 'i Flgurcs 1-4 illustrate the various stagcs in the manu~
facture,of a sealing nut according to the teachings of the pres~ent ~nvention;
Figure 5 is a partial cutaway o.f a complete sealing nut manufnctured according to the present invcntion;
Fig~lre 6 is an enlargcd view of the counterbore of a nut blank made according to conventional practice; and .
Figure 7 is an enlarged view of the counterbore of a nut blank ma.de according to the teachings of the present invention. .
DETAIL'ED VESCE~IPTION OF TETE PREF~RRE:D EMBODIMENT
A complete sealing nut 10 made according to the present .
invention is illustrated in Figure 5. The sealing nut 10 includes a body .
comprising a base section 12 and a torque receiving section or ~Iwrench ., pad" 14. The torque-receiving section 14 typically bears a plurality of driving surfaces 20 which are adapted to'be engaged by a conventional wrench. The base section 12 of the nut 10 includes a flat annular .
bearing surface 16 of expande,d dia~neter relative to the torque-receiving , section 14, and a taperecl portion 18 which joins the base section 12 , to the torque-receiving section 14. , .
-~' ~ ~~ Thc sealing nut 10 has for~necl therein a central bore . 22 having an intcrnal thread 2~. The threadcd portion 2~ of the ccntralbore 22 is substanti~llly limitcd to the torquc-receiving section 14 of the scaling nut 10, with tllc ccntral bore 22 bcm~ cnlargcd by a ~ 3~ ' .
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countorborc 2G 3t thc b;~sc Cn(] 12 of thc nut 10. Tl~c countcrbol ~ 2&
18 actually a two-sLep countcrborc with tha dlamctcr oî thc ccntral borc 22 bcing Incrcased initially frora thc threadcd diamcter 24 to a .
first cnlargcd diamctcr 28 and then furthcr lncrcased to a second S enlargcd diamctcr 30 at the base end 12 of the nut 10. Import:mtly, it will bc noted that the final enlarged counterbore diameter 30 is reduccd slightly at the bearing surface 16 of the nut 10 as indicated at 32. Thc purposc of the "lip" 32, as noted prcvio~sly, is to provide a means for retaining the sealing ring 3~1 in place. .
In particular, sealing ring 34 comprises an annular-shaped deformable plastic material, such as teflon, that has an inner diameter 34 slihtly larger than the threaded diameter 24 of the central bore 22 and an outer diameter 38 substantially equivalent to the second enlarged counterbore diameter 30. In this ma~ner, the ;
sealing ring 34 is adapted to be press-fitted into the second enlarged .... ~ .
counterbore 30 so that it seats against the ledge 40 and is frictionally secured in place by the reduced diameter of the lip 32. . .
In addition, it will be noted that the thickness of the sealing ring 34 is substarltially greater than the depth of the second 20 enlarged counterbore 30 so that the sealing ring 3~ protrudes above the bcaring surface 16 of the nut 10 when properly secured within the counterbore 30. In this manner, whcn the nut 10 is torqued down to the point where the bcaring surface 1~ contacts the workpicce, .
the protruding portion of the sealing ring 34 is deformcd inwardly ., 25 lnto thc thrcads of the bolt on wbich the nut 10 is fastened, thercby forminL~ a fluid-tigl1t scal along thc shaoli of thc bolt. Thc dcformation of thc ~caling ring 3~ also scrvcs thc ~ddcd purposc of locking the ~ ,.................................... .....
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nut 10 to thc l~olt to rcaJYt looscnln~ duo to vlbr3tlon, ete.
l~cfcrr1ng now to Ii'igurcs 1-~L, thC prcfcrrcd l~ctho~l of m~klng tho nbovc dcscribctl scallng nut 10 accord1ng to thc prcsent lnvcntlon will now bc expl3incd. The nut blt~nks ~ uscd to matcc the scaling nuts I0 dcscribed hcrcin arc m:lde from a metal slu¢ ~0, herein comprised of aluminum. The slug 40 is initially cold formed into the Sasic confi~uration of the nut blank 44 111ustrated in Figure 2 with a torque-receiving end 14 and a flanged basc section 12. The nut blank ~1~ is thcn cold formed a second time to form the colmtcrborc 26 I0 , in the base end 12 of the nut. The bearing surface lG of the nut is also formed during thè step so as to leave an annular ring or "lip" 42 of - excess material protruding above the bearing surface 16 around the periphery of the counterbore 26, 5'ypically, the driving surfaces 20 on the torque-receiving end I4 (Figure 5) are formed during this step as well. The nut blank 4~ is then cold formed a third time to flatten the bearing surface 16 of the nut, thereby causing the excess material in the "lip'! 42 to flow radially inwardiy as indicated at 32, thereby reducing slightly the diameter of the counterbore 2~ at the bearing surface 16 of the nut. The central bore 22 is then machined through the torque-receiving end 14 of the nut and an appropriate internal thread formed therein. The annular s0aling ring 36 is subsequently snap~fittcd into the counterbore 26 to complete the sealing nut I0 illustrated in Figure 5.
Referring to Figures 6 and 7, the advantages of producing .
thc sealing nut 10 according to the prcsent invenlion will now be 4 explained. In Figure 6, an enlarged vicw of a scction of thc countcr-borc 2G of a nut bl;mlc 4~ formcd according to conYcntion~l practic~
ls sllown. l~s 1s wcll known to thoso skillc~! in tllc art, thc cold forming .~ . .
" 5~
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.- ' ' . .
, , , I' : ~ . . . : ~ : , :, : .
,: ' . ! ', '' ~ : . . : . '' , ! ~: ' ' ' .. ;..... .- ,. : '' : ; ' " ' ::. ' . : ' '. .
. . , ' ;' l ~ ~ .
proeess creates rnet:ll flow llnes ~1~' ln the nut blanlc ~ whlell sut~s~tantintly - follow tlle contour of the cotd formed counterl)ore 2~', ilowcvcr, wllcn the undercut ~G is machine(l into the counterbore 2G' according to ` .
prlor art practice, flow lines 4~' are brolcen by the machining operation, thus ereating a 3tress point or stress "riser" 50 in the vicinity o~ the bend at the base of the undereut 46. The effeet of the stress riser 50 .
is to eoncentrate stress forces at this point, thereby reducing the integrity of the nut and restricting the torque and load limits of the nut.
In :Figure 7, however it can be seen that a nut blank 4'L made ptlrsuant to the teachings of the present invention results in metal flow lines which substantially follow the contour of the "lip"
32. Specifically, when the lip 32 is bent over from the position indicated by the dotted line 42, the cold forming process causes the flow lines 48 to follow the movement of metal radially inwardly creating the slightly reduced diameter in the counterbore 26 at the bearing surface 16. Thus, the disadvantage of breaking flow lines caused .
by the undercutting opcration is eliminated.
Accordingly, as will be appreciated by those skilled ~n the art, the nut blank 44 made according to the process of the present invention possesses superior load bearing characteristics than a nut manuhctured pursuant to prior known methods. Moreover, as noted~ in the background and summary, because the lip 32 is .
cold formed rather than undercut by a separate machining operation, .
the cost of manufacturing the nut according to the proccss c>f the present invcntion is si~nificantly rcduced.
While the above description constitutes the preferred e~l~odimellt of the invention, lt will be llppreclated that the invention --6~
.
586~
1~ fJu~ccptll~lc to modiSlc~tlon, v~rl~tlon ilnd ch~nL~c wl~hout dcpi~r~ln~
Irom tllo propcr NCOpC or lulr mF:~nln~ o~ Ihc ~ccoml~nnyln~ cl~lm~, ¦
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BACKGROUND ~ND SUMMARY OF THE INVENTION
-The present invention relates to a fluid-sealing nut and in particular to an improved method of making the same.
Sealing nuts of the present type are commonly used in the aircraft industry wherein many aircraf-t are designed with "wet" wings which require that the fasteners utilized in the wings form a fluid-tight seal. Currently, the most widely used type of sealing nut in the aircraft industry comprises a nut having an annular deformable sealing ring inserted into a counterbore cut into the bearing surface of the nut. Typically, the sealing ring is designed to protrude above the bearing surface of the nut so that when the nut is torqued down against the workpiece, the sealing ring is deformed inwardly into the threads on the shank of the bolt thereby formin~ a fluid-tight seal.
Sealing nuts oE this type are generally made by a process whereby a counterbore is cold formed into the bearing surface of the nut and then an undercut is machined into the side walls of the counterbore to provide a means for retaining the sealing ring in place. The disadvantage of this process is that the undercut requires a separate machining operation which slows the production rate of the sealing nuts and hence significantly increases cost.
Moreover, as with all cutting operations, the undercut surface creates a weakened stress point in the nut which restricts the torque and load limits of the nut.
The present invention seeks to eliminate these disadvantages by providing a new and improved method of making the above-described sealing nut. In particular, utilizing the method of the present 28 invention, when the nut is initially cold formed according to ., ~
rw/~l~
,: ;,: .
.. . . . . .
~S~631 conventional practice, a protruding ridge of excess material is purposefully retained around the periphery o the counter-bore. When the nut is then cold formed a second time ko smooth the bearing surface of the nut, the excess material is forced inwardly, thereby reducing slightly the surface diameter of the counterbore. In this manner, a means for retaining the sealing ring is created without requirinq a separate machining operation and without weakening the structure of the nut. In fact, as will subsequently be 10~ explained in greater detail, the cold forminq process of the present invention actually strengthens the load bearing surface of the nut. Thus, the resulting sealinq nut produced is not only less costly to manufacture but is also a better quality nut.
The present invention is defined as a method of making a seal nut comprising a body having a load bearing surface and a sealing ring disposed within a counterbore in the bearing surface of said body, the method comprising the steps of: forming the body of the nut; cold forming the counterbore in the bearing surface of the body so as to retain a circular ridge of excess material protruding above the bearing surface around the periphery of the counterbore, cold forming the bearing surface to 1atten the surface and force the excess material radially inwardly; and thereafter inserting the sealing ring into the counterbore.
Additional objects and advantages of the present invention will become apparent from a readinq of the detailed 28 description of the rw/ - 2 -- :~
r ~ 566~
prc~crrc~l cmbo~llmcnt whlch m:~lce rcfcrcncc to thc followlng ~ot of dr;lwln~ In w hlch: , , nRlET~' D~3SCI~Ir-'TlON OIi' TTIE' l~RAWINC:S 'i Flgurcs 1-4 illustrate the various stagcs in the manu~
facture,of a sealing nut according to the teachings of the pres~ent ~nvention;
Figure 5 is a partial cutaway o.f a complete sealing nut manufnctured according to the present invcntion;
Fig~lre 6 is an enlargcd view of the counterbore of a nut blank made according to conventional practice; and .
Figure 7 is an enlarged view of the counterbore of a nut blank ma.de according to the teachings of the present invention. .
DETAIL'ED VESCE~IPTION OF TETE PREF~RRE:D EMBODIMENT
A complete sealing nut 10 made according to the present .
invention is illustrated in Figure 5. The sealing nut 10 includes a body .
comprising a base section 12 and a torque receiving section or ~Iwrench ., pad" 14. The torque-receiving section 14 typically bears a plurality of driving surfaces 20 which are adapted to'be engaged by a conventional wrench. The base section 12 of the nut 10 includes a flat annular .
bearing surface 16 of expande,d dia~neter relative to the torque-receiving , section 14, and a taperecl portion 18 which joins the base section 12 , to the torque-receiving section 14. , .
-~' ~ ~~ Thc sealing nut 10 has for~necl therein a central bore . 22 having an intcrnal thread 2~. The threadcd portion 2~ of the ccntralbore 22 is substanti~llly limitcd to the torquc-receiving section 14 of the scaling nut 10, with tllc ccntral bore 22 bcm~ cnlargcd by a ~ 3~ ' .
'' ' .
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.'''.'.~`'`'~''-~"li;'t'~ t ,..... ~ ~.. r.rr~ rt~tt--rttt~t.v~ tr~tt_l~t.~_ttlt W~C~t t~ttl~_~
' ' "' `' . ' ~ ' . `'' , : :- .
~ , , ,; ' "' .'' , ' '. ,: '` ' ,, . , ., `' ' ' : "' ,' .' . . ' :
' . ~ ~ " ' :' 0 11~!5661 ~ I
countorborc 2G 3t thc b;~sc Cn(] 12 of thc nut 10. Tl~c countcrbol ~ 2&
18 actually a two-sLep countcrborc with tha dlamctcr oî thc ccntral borc 22 bcing Incrcased initially frora thc threadcd diamcter 24 to a .
first cnlargcd diamctcr 28 and then furthcr lncrcased to a second S enlargcd diamctcr 30 at the base end 12 of the nut 10. Import:mtly, it will bc noted that the final enlarged counterbore diameter 30 is reduccd slightly at the bearing surface 16 of the nut 10 as indicated at 32. Thc purposc of the "lip" 32, as noted prcvio~sly, is to provide a means for retaining the sealing ring 3~1 in place. .
In particular, sealing ring 34 comprises an annular-shaped deformable plastic material, such as teflon, that has an inner diameter 34 slihtly larger than the threaded diameter 24 of the central bore 22 and an outer diameter 38 substantially equivalent to the second enlarged counterbore diameter 30. In this ma~ner, the ;
sealing ring 34 is adapted to be press-fitted into the second enlarged .... ~ .
counterbore 30 so that it seats against the ledge 40 and is frictionally secured in place by the reduced diameter of the lip 32. . .
In addition, it will be noted that the thickness of the sealing ring 34 is substarltially greater than the depth of the second 20 enlarged counterbore 30 so that the sealing ring 3~ protrudes above the bcaring surface 16 of the nut 10 when properly secured within the counterbore 30. In this manner, whcn the nut 10 is torqued down to the point where the bcaring surface 1~ contacts the workpicce, .
the protruding portion of the sealing ring 34 is deformcd inwardly ., 25 lnto thc thrcads of the bolt on wbich the nut 10 is fastened, thercby forminL~ a fluid-tigl1t scal along thc shaoli of thc bolt. Thc dcformation of thc ~caling ring 3~ also scrvcs thc ~ddcd purposc of locking the ~ ,.................................... .....
.
,~
.
.
': . ' '' ,~, i~561 ~ ~
nut 10 to thc l~olt to rcaJYt looscnln~ duo to vlbr3tlon, ete.
l~cfcrr1ng now to Ii'igurcs 1-~L, thC prcfcrrcd l~ctho~l of m~klng tho nbovc dcscribctl scallng nut 10 accord1ng to thc prcsent lnvcntlon will now bc expl3incd. The nut blt~nks ~ uscd to matcc the scaling nuts I0 dcscribed hcrcin arc m:lde from a metal slu¢ ~0, herein comprised of aluminum. The slug 40 is initially cold formed into the Sasic confi~uration of the nut blank 44 111ustrated in Figure 2 with a torque-receiving end 14 and a flanged basc section 12. The nut blank ~1~ is thcn cold formed a second time to form the colmtcrborc 26 I0 , in the base end 12 of the nut. The bearing surface lG of the nut is also formed during thè step so as to leave an annular ring or "lip" 42 of - excess material protruding above the bearing surface 16 around the periphery of the counterbore 26, 5'ypically, the driving surfaces 20 on the torque-receiving end I4 (Figure 5) are formed during this step as well. The nut blank 4~ is then cold formed a third time to flatten the bearing surface 16 of the nut, thereby causing the excess material in the "lip'! 42 to flow radially inwardiy as indicated at 32, thereby reducing slightly the diameter of the counterbore 2~ at the bearing surface 16 of the nut. The central bore 22 is then machined through the torque-receiving end 14 of the nut and an appropriate internal thread formed therein. The annular s0aling ring 36 is subsequently snap~fittcd into the counterbore 26 to complete the sealing nut I0 illustrated in Figure 5.
Referring to Figures 6 and 7, the advantages of producing .
thc sealing nut 10 according to the prcsent invenlion will now be 4 explained. In Figure 6, an enlarged vicw of a scction of thc countcr-borc 2G of a nut bl;mlc 4~ formcd according to conYcntion~l practic~
ls sllown. l~s 1s wcll known to thoso skillc~! in tllc art, thc cold forming .~ . .
" 5~
;. .
.- ' ' . .
, , , I' : ~ . . . : ~ : , :, : .
,: ' . ! ', '' ~ : . . : . '' , ! ~: ' ' ' .. ;..... .- ,. : '' : ; ' " ' ::. ' . : ' '. .
. . , ' ;' l ~ ~ .
proeess creates rnet:ll flow llnes ~1~' ln the nut blanlc ~ whlell sut~s~tantintly - follow tlle contour of the cotd formed counterl)ore 2~', ilowcvcr, wllcn the undercut ~G is machine(l into the counterbore 2G' according to ` .
prlor art practice, flow lines 4~' are brolcen by the machining operation, thus ereating a 3tress point or stress "riser" 50 in the vicinity o~ the bend at the base of the undereut 46. The effeet of the stress riser 50 .
is to eoncentrate stress forces at this point, thereby reducing the integrity of the nut and restricting the torque and load limits of the nut.
In :Figure 7, however it can be seen that a nut blank 4'L made ptlrsuant to the teachings of the present invention results in metal flow lines which substantially follow the contour of the "lip"
32. Specifically, when the lip 32 is bent over from the position indicated by the dotted line 42, the cold forming process causes the flow lines 48 to follow the movement of metal radially inwardly creating the slightly reduced diameter in the counterbore 26 at the bearing surface 16. Thus, the disadvantage of breaking flow lines caused .
by the undercutting opcration is eliminated.
Accordingly, as will be appreciated by those skilled ~n the art, the nut blank 44 made according to the process of the present invention possesses superior load bearing characteristics than a nut manuhctured pursuant to prior known methods. Moreover, as noted~ in the background and summary, because the lip 32 is .
cold formed rather than undercut by a separate machining operation, .
the cost of manufacturing the nut according to the proccss c>f the present invcntion is si~nificantly rcduced.
While the above description constitutes the preferred e~l~odimellt of the invention, lt will be llppreclated that the invention --6~
.
586~
1~ fJu~ccptll~lc to modiSlc~tlon, v~rl~tlon ilnd ch~nL~c wl~hout dcpi~r~ln~
Irom tllo propcr NCOpC or lulr mF:~nln~ o~ Ihc ~ccoml~nnyln~ cl~lm~, ¦
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'`'' ~ '. '' ', ' ' . .'' ,' ' - , , .
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... . ~ :.. : : : . ~ : .
Claims (4)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of making a seal nut comprising a body having a load bearing surface and a sealing ring disposed within a counterbore in the bearing surface of said body, the method comprising the steps of:
forming the body of said nut;
cold forming said counterbore in said bearing surface of said body so as to retain a circular ridge of excess material protruding above said bearing surface around the periphery of said counterbore, cold forming said bearing surface to flatten said surface and force said excess material radially inwardly; and thereafter inserting said sealing ring into said counterbore.
forming the body of said nut;
cold forming said counterbore in said bearing surface of said body so as to retain a circular ridge of excess material protruding above said bearing surface around the periphery of said counterbore, cold forming said bearing surface to flatten said surface and force said excess material radially inwardly; and thereafter inserting said sealing ring into said counterbore.
2. The method of claim 1 further including the step of forming a threaded central bore in said nut having a diameter less than the diameter of said counterbore.
3. The method of claim 2 wherein said sealing ring is annular shaped having an internal diameter slightly larger than the diameter of said central bore and an external diameter substantially equal to the diameter of said counter-bore.
4. The method of claim 3 wherein said counterbore is cold formed to a depth less than the thickness of said sealing ring so that said sealing ring protrudes above said bearing surface when inserted within said counterbore.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US94782178A | 1978-10-02 | 1978-10-02 | |
| US947,821 | 1978-10-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1105661A true CA1105661A (en) | 1981-07-28 |
Family
ID=25486837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA317,890A Expired CA1105661A (en) | 1978-10-02 | 1978-12-13 | Method of making a seal nut |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5548447A (en) |
| CA (1) | CA1105661A (en) |
| DE (1) | DE2855712A1 (en) |
| FR (1) | FR2437892A1 (en) |
| GB (1) | GB2030483B (en) |
| IT (1) | IT1192308B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3134857C2 (en) * | 1981-09-03 | 1985-11-21 | Bayerisches Leichtmetallwerk Graf Blücher von Wahlstatt GmbH & Co KG, 8000 München | Process for the production of coupling parts |
| DE19624772C2 (en) * | 1996-06-21 | 2000-06-29 | Blw Praezisionsschmiede Gmbh | Claw teeth for manual transmissions or the like |
| ATE429586T1 (en) † | 2000-06-23 | 2009-05-15 | Hi Shear Corp | PRESS COLLAR WITH INTERNAL SEALING RING |
| EP3537093A1 (en) * | 2010-09-17 | 2019-09-11 | Schott AG | Ring or board-shaped element and method for manufacturing the same |
| RU2449853C1 (en) * | 2010-09-23 | 2012-05-10 | Открытое акционерное общество "Белебеевский завод "Автонормаль" | Method of producing wheel nut |
| FR3042832B1 (en) * | 2015-10-22 | 2017-12-22 | Lisi Aerospace | NUT SEAL |
| CN109000129B (en) * | 2018-09-13 | 2023-08-04 | 泰州市创新电子有限公司 | Display support frame |
| PL3822507T3 (en) * | 2019-11-18 | 2023-04-11 | SFS Group International AG | Actuating unit for an electric parking brake |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51136067A (en) * | 1975-05-17 | 1976-11-25 | Katsuyoshi Yasui | Fabrication method for nut attached with hilt containing nylon |
-
1978
- 1978-12-13 CA CA317,890A patent/CA1105661A/en not_active Expired
- 1978-12-18 GB GB7848952A patent/GB2030483B/en not_active Expired
- 1978-12-20 IT IT31067/78A patent/IT1192308B/en active
- 1978-12-22 DE DE19782855712 patent/DE2855712A1/en active Granted
- 1978-12-28 FR FR7836802A patent/FR2437892A1/en active Granted
-
1979
- 1979-01-05 JP JP54179A patent/JPS5548447A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB2030483B (en) | 1982-09-29 |
| DE2855712C2 (en) | 1984-05-30 |
| DE2855712A1 (en) | 1980-04-10 |
| FR2437892B3 (en) | 1981-10-09 |
| IT1192308B (en) | 1988-03-31 |
| JPS5548447A (en) | 1980-04-07 |
| FR2437892A1 (en) | 1980-04-30 |
| GB2030483A (en) | 1980-04-10 |
| IT7831067A0 (en) | 1978-12-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |