CA1250735A - Sheet metal joining method and apparatus, and sheet metal joint - Google Patents
Sheet metal joining method and apparatus, and sheet metal jointInfo
- Publication number
- CA1250735A CA1250735A CA000477092A CA477092A CA1250735A CA 1250735 A CA1250735 A CA 1250735A CA 000477092 A CA000477092 A CA 000477092A CA 477092 A CA477092 A CA 477092A CA 1250735 A CA1250735 A CA 1250735A
- Authority
- CA
- Canada
- Prior art keywords
- set forth
- support members
- sheet metal
- male die
- cutting edges
- 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
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
- B21D39/031—Joining superposed plates by locally deforming without slitting or piercing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Punching Or Piercing (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Secondary Cells (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method and apparatus for joining sheet metal pieces employing a male die and a female die wherein within one stroke only one piece is provided with incisions and the material of the other piece is pressed through the area between the incisions and laterally extruded beyond the edges so to form a rivet-type connection.
A method and apparatus for joining sheet metal pieces employing a male die and a female die wherein within one stroke only one piece is provided with incisions and the material of the other piece is pressed through the area between the incisions and laterally extruded beyond the edges so to form a rivet-type connection.
Description
`` ~;z5-U~735 23~8-125 The present invention relates to a joining method in which two sheet metal pieces lying side-by-side are joined. The invention further relates to an apparatus adapted to implement the method of the invention and of a ioint of two sheet .metals made therewith.
Canadian Patent 1,1~2,665 discloses an apparatus for joining sheet metal pieces in side-by-side relation. The apparatus cornprises a female die having a central anvil member and support members adjacent to the anvil rnember extending beyond the anvil working face. The support members have cutting edges at their distal ends and may flex resiliently outwards with respec-t to the anvil member.
Further, the apparatus comprises a rnale die, which is movable relative to the female die through the sheet metal pieces towards the anvil Member's working face. In use the male die and the female die co-operate such that both sheet metal pieces are cut along congruent incisions and with the male die pressing against the anvil member working surface of the female die, the material is deformed through -the sheet metal pieces is la-terally extruded to engage beyond -the edges o-E the incisions opposite the sheet metal first pierced by the male die. For this purpose the male die (or each of the rnale dies if there is a plurality of male dies and female dies) has cutting edges so that the sheet metal piece first engaged by the male die is properly cut as well as the other sheet metal adjacent the female die.
Joints made by means of this known apparatus in general
Canadian Patent 1,1~2,665 discloses an apparatus for joining sheet metal pieces in side-by-side relation. The apparatus cornprises a female die having a central anvil member and support members adjacent to the anvil rnember extending beyond the anvil working face. The support members have cutting edges at their distal ends and may flex resiliently outwards with respec-t to the anvil member.
Further, the apparatus comprises a rnale die, which is movable relative to the female die through the sheet metal pieces towards the anvil Member's working face. In use the male die and the female die co-operate such that both sheet metal pieces are cut along congruent incisions and with the male die pressing against the anvil member working surface of the female die, the material is deformed through -the sheet metal pieces is la-terally extruded to engage beyond -the edges o-E the incisions opposite the sheet metal first pierced by the male die. For this purpose the male die (or each of the rnale dies if there is a plurality of male dies and female dies) has cutting edges so that the sheet metal piece first engaged by the male die is properly cut as well as the other sheet metal adjacent the female die.
Joints made by means of this known apparatus in general
- 2 - 23448-125 have a strength sufficient for most practical applications. How-ever, in some cases extreme joint strength is required, a strength which cannot be acheived by using the method and apparatus dis-closed in the referenced patent. It is the object of the present invention to provide method and apparatus by means of which joints of increased strength may be produced. "Increased strength", in this context, means higher strength as compared with the strength of joints made by use of the apparatus referred to above, under circumstances which otherwise are the same (thickness and type of the sheet metals to be joined, size of the joint, etc.).
According to the invention there is provided a method for joining two overlapping sheet metal pieces wherein only one of said pieces is provided with incisions proximate to each other to define a joining area therebetween, comprising deforming said other piece at a site congruent with said area substantially perpendicular to the sheet plane thereof towards said one piece so as to deform said area until material of said other piece protrudes beyond the face of said one piece opposite said other piece, and compressing said protruding material whereby the latter flows sidewards in clamping engagement beyond the edges of said incisions opposite said other piece.
The invention also provides an apparatus for joining two over-lapping sheet metal pieces comprising a female die having a central anvil member and support members adjacent said anvil member, each support member projecting beyond a working surface of said anvil member and having cutting edges at the ends of said projections, ~B~
lZ5~73S
According to the invention there is provided a method for joining two overlapping sheet metal pieces wherein only one of said pieces is provided with incisions proximate to each other to define a joining area therebetween, comprising deforming said other piece at a site congruent with said area substantially perpendicular to the sheet plane thereof towards said one piece so as to deform said area until material of said other piece protrudes beyond the face of said one piece opposite said other piece, and compressing said protruding material whereby the latter flows sidewards in clamping engagement beyond the edges of said incisions opposite said other piece.
The invention also provides an apparatus for joining two over-lapping sheet metal pieces comprising a female die having a central anvil member and support members adjacent said anvil member, each support member projecting beyond a working surface of said anvil member and having cutting edges at the ends of said projections, ~B~
lZ5~73S
3 - 23448-125 said support members being adapted to flex away from said anvil member, and comprising further a male die adapted to be pressed towards said working surface of said anvil thereby deforming sheet metal pieces disposed between said dies, said male die having a working surface opposite said anvil working surface, said male die working surface being narrower than the distance spacing said support member cutting edges.
Surprisingly it has been found that joints produced by this method and apparatus have a strength exceeding that of the known joints referred to above by at least 50~ and, in some cases (shearing strength) by 75~. As a further advantage it is to be noted that the non-cut sheet metal remains fluid-tight, a fact which in some applications is of utmost importa~e. Frequently, the sheet metals have a coating for purposes of corrosion protect-ion, and if such coating (for example zinc plating on steel) is plastically deformable, the coating of the non-cut sheet also will remain intact.
A joining method and apparatus and a joint produced therewith wherein the joint remains fluid-tight are disclosed in the DE-A- 31 06 313. According to the teaching of this publication, sheet metal pieces are joined by means of an apparatus having a male die and a female die. Neither die has cutting edges with the result that no incisions are produced. Instead, both sheet metal pieces are bulged at the joint site so that material of both pieces protrude to one side, and thereafter bo-th protruding material ~25~73S
~ 3a - 23448-125 portions are laterally compressed. For this purpose the female die may laterally open against spring bias. The deformed portion of the piece adjacent the female die does not contribute to the strength of the joint; on the contrary ~., l~S~35 it withstands the lateral deformation of the other sheet metal portion so that the joint strength obtained is limited. Moreover, all inte.rengaging surfaces of the two sheet metal pieces are rounded, which fact fur-ther limits the joint strength. These considerations, again, refer to joints produced from identical materials and of comparable size.
A particularly simple embodimant of the aloparatus according to the invention comprises a female die having only two support members, each having a cutting edge, the cutting edges of ~0 the two support members being parallel to each other. This embod-iment is not only simple in manllfacture but also easy to adjust on a press because the alignment of male and female die must be effected only in direction perpendicular to -the cutting edges, alignment in the direction orthogonal thereto being non-cri-tical.
Embodiments of apparatus according -to the invention will be explained hereunder with reference to the accompanying drawings. These drawings are simplified in an attempt to illus-trate only the features of importance for the implementation of the invention; for further details reference may be made to the disclosure of the Canadian Patent 1,182,665.
Figure 1 shows in partial side view a first embodiment, the two sheet metal pieces to be joined being shown in section;
Figure 2 shows in similar manner the elemen-ts after termi-nation of the joining stro]~e;
Figure 3 iLlustrates in an isometric view, par-tially in sect-ion, a joint according to the invention as produced by the appar-atus shown in Figure 1 and 2;
~2S~?'735 Figure 4 is an illustration similar to Figure 3 but seen in direction of the arrows 4-~ of Figure 3;
Figure 5 is a plan view of the joint o Figure 3, 4;
Figure 6, 7 and 8 show plan views of the female dies of fur-ther embodiments of the apparatus;
Figure 9 shows in side-view a male clie of a Eurther embodi-ment.
Figure 10 is similar to Figure 1 and shows a female die oE
different desicJn; and, Figure 11 is a sectional view of the female dle of Figure 10 in the direction oE ~QW~ 11.
The press on which the co-operating tool parts, i.e.
male die and female die, are mounted aligned to each other is not shown in the drawings. The operating direction of the press results readily from the combination of Figure 1 and 2 which show the two possible relative positions of male and female dies at the beginning and at the end of the press stro~e.
At first Figure 1 through 5 are referred to.
The Eemale die comprises a stationary anvil member 10 supported at its bottom in the press. The anvil member 10 has a substantially rectangular elongated section shape; Figure 1 shows the side view on -the narrower side. Support members 12 extend along the larger sides of the anvil member, the support members 12 being mounted to resiliently yield sidewards (cf. Figure 2), the -free edges of the support members adjacent the anvil member acting as cutting edges. The plane deEined by the two cutting edges is somewhat elevated with respect to the somewha-t convex ~IZ~735 working face 16 of the anvil member lO, this elevation being smaller than the sum of the thicknesses of the two sheet metal pieces l8, 20 but the elevation exceeds the thickness o-f the sheet 1~ acljacent to the female die.
The male die 22 has a working surface 24 which as illus-trated in Figure 1 is narrower than -the distance spacing the cutting edges of the two support members oE the female die. The male die section tapers outwards from its working surface so that the die-portion which penetrates into the sheets h~s a trunco-pyramidal shape with a rectanyular base. The pyramid sides areinclined with respect to the die-axes at about 20; this corre-sponds to an apex angle of 40. The difference between the wid-th oE male die working surface 24 and the spacing of the two cutting edges from each other depends upon the -thickness of the sheets, in particular upon the thickness of the sheet 20, and preferably is dimensioned such -that this sheet 20 during the joining operation is just not cut. The edge surrounding working sur-face 24 is rounded (in the illustrated embodiment the rounding radius is in the order of magnitude of 0,5mm) and polished thereafter. The side faces of the trunco-pyramidal die portion are designated 26.
The contour of the male die at the sides extending orthogonal to the cutting edyes of the female die is not illustrated in Figure 1 and 2, however, is seen in Figure 9 whlch shows a male die comprising two die members similar -to the male die of Figures 1 and 2. It is to be noted that here again the con~our has about the same apex, pyramidal angle as the other sides extending parallel to the cutting edges.
~25~7~i~S
~ hile Figure 1 shows the si-tuation prior to the joining, Figure 2 illustrates the result of the press stroke. It is to be noted that the press is adjusted either with respec-t to the pres-sure applied or with respect to its stro]ce.
In Figure 2 sheet 18 has been cut along the cutting edges 14 which extend orthogonal to the plane of the drawing, due to the co-operation of these cutting edges with the male die 22 and the sheet portion 30 between the incisions is deEormed through to the working face 16 of the anvil member. Upon further pressure (and thus fur-ther stroke) o male die 22 the deformed portion 32 of shee-t 20 which was not cut is extruded such that its material is plastically deformed laterally beyond the edges 3~ which have been cut free so to ridgidly engage thereon. The portion 30 remains connected to sheet 1~ at its ends 36 because there was no cutting operation. The joint so produced is illustrated in detail in Figure 3 to 5.
In the first embodiment described above there were only two incisions in the sheet 18. The female die and the male die for this purpose have a very simple design to be manufactured at low cost. If particular design considerations are to be met with regard to the appearance of the joints, for example if the joints are visible in household appliances, an embodiment of the appa-ratus according to the invention may be preferred as illustrated in Figure 6 to 8. I`hese embodiments are shown only as plan views on the female die. The anvil member 10' (Figure 6) and 10"
(Figure 7) is cylindrical, and tlle support members 12' and 12"
respec-tively have cutting edges ~hich cut into the adjacent sheet l~S~'73S
respec-tively along four (Figure 5) and three (Figure 7) arcs having the same xadius and a common centre. Between the incisions there is always a connection performin~ the same function as -the connections 36 in Figure 3. 1'he working surface of the respec-tive male die is indicated in dashed lines at 24' and 24" respectively;
the contour of these male dies will then be truncated conical wi-th an apex angle of preferably 40, similar to Figure 1.
In the embodiment of Figure 8 there are four support members 12"' disposed about an anvil member lO"' having a square section shape. The connections will then be provided in the cor-ners. It is to be noted that under certain circumstances the connecting portions may be eliminated. This would mean in Figure 6 and 7 a closecl circular incision and in Figure 8 a closed square incision with the result that a small plate portion would be stamped fro~ the sheet adjacent the female die having the respec-tive contour. The appearance of the joint would then be very similar to a rivet head, however, after each joining operation the stamped out plate portion would have to be ejected from -the female die.
The male die according to Figure 9 is a twin die wherein two male dies according to Figure 1 are disposed side by side and are manufactured in an integral piece. One will see the two working faces 24a, 2~b and t`he respectively allocated flanges 28 extending or-thogonal to the cutting edges of the female die (not shown) and also define an apex angle of ~0. The cutting edges of the respective female die are similar to Figure 1 but somewhat ~25~73~
longer so that with one press stroke only two juxtaposed joints are produced.
Figure 10 and ll show a female die in which the support members are replacable.
The female die comprises a socket 118 having a planar bottom 120 parallel to the table of a press (not shown) and a planar clamping surface 122 which extends orthogonal to the bottom 120. A threaded hole 12~ extends into the socket from the clamping surface 122.
Support members 126, 128 and anvil member :l30 are sepa-rately produced components. Anvil member 130 is a stamped steel part while the support members are cut from spring steel and have each two cutting edges on both sides with respect to the anvil member. In the area of the cutting edges the support members are hardened or hard-coated and ground. Anvil member and support members have through-'noles which when assembled are aligned with the threaded bore 124, forces acting upon the components during the joining operation being transmitted to the socket because the support members and the anvil member engage the bottom Eace 120.
On the side of the support member 126 facing away from clamping surface 122 there is a clamping disc 13~ which also has an aligned through-hole. The entire assembly is clamped by means of a screw 136. Figure 10 illustrates the situa-tion prior to the final fastening of the screw so that it may be seen that the disc 13~ is outwardly bulged so to act as a resilient disc.
Its lower edge also abuts the bo-ttom face 120.
This embodiment has the advantage that the support members may be turned outside-in after t'neir cutting edges become worn and when the second pair of cutting edges also has become worn may be replaced. Moreover, -the anvil member also may be exchanged. Such an exchange will most probably not become due to the anvil member being worn, but another anvil member will permi-t the joining of sheet metal pieces having di-Eferent thicknesses, which requires a different spacing between cutting edges 132 and anvil working face l38.
The upper edge 140 of the disc is dispose~ on the same level as the upper edge 142 of clampiny surface 122 so that there are identical clamping conditions for both support ~embers.
As may be seen from ~igure 11 the support members have laterally cut off contour so that the bending tension duriny the lateral yielding is distributed in uniform manner over the length of the support members.
Surprisingly it has been found that joints produced by this method and apparatus have a strength exceeding that of the known joints referred to above by at least 50~ and, in some cases (shearing strength) by 75~. As a further advantage it is to be noted that the non-cut sheet metal remains fluid-tight, a fact which in some applications is of utmost importa~e. Frequently, the sheet metals have a coating for purposes of corrosion protect-ion, and if such coating (for example zinc plating on steel) is plastically deformable, the coating of the non-cut sheet also will remain intact.
A joining method and apparatus and a joint produced therewith wherein the joint remains fluid-tight are disclosed in the DE-A- 31 06 313. According to the teaching of this publication, sheet metal pieces are joined by means of an apparatus having a male die and a female die. Neither die has cutting edges with the result that no incisions are produced. Instead, both sheet metal pieces are bulged at the joint site so that material of both pieces protrude to one side, and thereafter bo-th protruding material ~25~73S
~ 3a - 23448-125 portions are laterally compressed. For this purpose the female die may laterally open against spring bias. The deformed portion of the piece adjacent the female die does not contribute to the strength of the joint; on the contrary ~., l~S~35 it withstands the lateral deformation of the other sheet metal portion so that the joint strength obtained is limited. Moreover, all inte.rengaging surfaces of the two sheet metal pieces are rounded, which fact fur-ther limits the joint strength. These considerations, again, refer to joints produced from identical materials and of comparable size.
A particularly simple embodimant of the aloparatus according to the invention comprises a female die having only two support members, each having a cutting edge, the cutting edges of ~0 the two support members being parallel to each other. This embod-iment is not only simple in manllfacture but also easy to adjust on a press because the alignment of male and female die must be effected only in direction perpendicular to -the cutting edges, alignment in the direction orthogonal thereto being non-cri-tical.
Embodiments of apparatus according -to the invention will be explained hereunder with reference to the accompanying drawings. These drawings are simplified in an attempt to illus-trate only the features of importance for the implementation of the invention; for further details reference may be made to the disclosure of the Canadian Patent 1,182,665.
Figure 1 shows in partial side view a first embodiment, the two sheet metal pieces to be joined being shown in section;
Figure 2 shows in similar manner the elemen-ts after termi-nation of the joining stro]~e;
Figure 3 iLlustrates in an isometric view, par-tially in sect-ion, a joint according to the invention as produced by the appar-atus shown in Figure 1 and 2;
~2S~?'735 Figure 4 is an illustration similar to Figure 3 but seen in direction of the arrows 4-~ of Figure 3;
Figure 5 is a plan view of the joint o Figure 3, 4;
Figure 6, 7 and 8 show plan views of the female dies of fur-ther embodiments of the apparatus;
Figure 9 shows in side-view a male clie of a Eurther embodi-ment.
Figure 10 is similar to Figure 1 and shows a female die oE
different desicJn; and, Figure 11 is a sectional view of the female dle of Figure 10 in the direction oE ~QW~ 11.
The press on which the co-operating tool parts, i.e.
male die and female die, are mounted aligned to each other is not shown in the drawings. The operating direction of the press results readily from the combination of Figure 1 and 2 which show the two possible relative positions of male and female dies at the beginning and at the end of the press stro~e.
At first Figure 1 through 5 are referred to.
The Eemale die comprises a stationary anvil member 10 supported at its bottom in the press. The anvil member 10 has a substantially rectangular elongated section shape; Figure 1 shows the side view on -the narrower side. Support members 12 extend along the larger sides of the anvil member, the support members 12 being mounted to resiliently yield sidewards (cf. Figure 2), the -free edges of the support members adjacent the anvil member acting as cutting edges. The plane deEined by the two cutting edges is somewhat elevated with respect to the somewha-t convex ~IZ~735 working face 16 of the anvil member lO, this elevation being smaller than the sum of the thicknesses of the two sheet metal pieces l8, 20 but the elevation exceeds the thickness o-f the sheet 1~ acljacent to the female die.
The male die 22 has a working surface 24 which as illus-trated in Figure 1 is narrower than -the distance spacing the cutting edges of the two support members oE the female die. The male die section tapers outwards from its working surface so that the die-portion which penetrates into the sheets h~s a trunco-pyramidal shape with a rectanyular base. The pyramid sides areinclined with respect to the die-axes at about 20; this corre-sponds to an apex angle of 40. The difference between the wid-th oE male die working surface 24 and the spacing of the two cutting edges from each other depends upon the -thickness of the sheets, in particular upon the thickness of the sheet 20, and preferably is dimensioned such -that this sheet 20 during the joining operation is just not cut. The edge surrounding working sur-face 24 is rounded (in the illustrated embodiment the rounding radius is in the order of magnitude of 0,5mm) and polished thereafter. The side faces of the trunco-pyramidal die portion are designated 26.
The contour of the male die at the sides extending orthogonal to the cutting edyes of the female die is not illustrated in Figure 1 and 2, however, is seen in Figure 9 whlch shows a male die comprising two die members similar -to the male die of Figures 1 and 2. It is to be noted that here again the con~our has about the same apex, pyramidal angle as the other sides extending parallel to the cutting edges.
~25~7~i~S
~ hile Figure 1 shows the si-tuation prior to the joining, Figure 2 illustrates the result of the press stroke. It is to be noted that the press is adjusted either with respec-t to the pres-sure applied or with respect to its stro]ce.
In Figure 2 sheet 18 has been cut along the cutting edges 14 which extend orthogonal to the plane of the drawing, due to the co-operation of these cutting edges with the male die 22 and the sheet portion 30 between the incisions is deEormed through to the working face 16 of the anvil member. Upon further pressure (and thus fur-ther stroke) o male die 22 the deformed portion 32 of shee-t 20 which was not cut is extruded such that its material is plastically deformed laterally beyond the edges 3~ which have been cut free so to ridgidly engage thereon. The portion 30 remains connected to sheet 1~ at its ends 36 because there was no cutting operation. The joint so produced is illustrated in detail in Figure 3 to 5.
In the first embodiment described above there were only two incisions in the sheet 18. The female die and the male die for this purpose have a very simple design to be manufactured at low cost. If particular design considerations are to be met with regard to the appearance of the joints, for example if the joints are visible in household appliances, an embodiment of the appa-ratus according to the invention may be preferred as illustrated in Figure 6 to 8. I`hese embodiments are shown only as plan views on the female die. The anvil member 10' (Figure 6) and 10"
(Figure 7) is cylindrical, and tlle support members 12' and 12"
respec-tively have cutting edges ~hich cut into the adjacent sheet l~S~'73S
respec-tively along four (Figure 5) and three (Figure 7) arcs having the same xadius and a common centre. Between the incisions there is always a connection performin~ the same function as -the connections 36 in Figure 3. 1'he working surface of the respec-tive male die is indicated in dashed lines at 24' and 24" respectively;
the contour of these male dies will then be truncated conical wi-th an apex angle of preferably 40, similar to Figure 1.
In the embodiment of Figure 8 there are four support members 12"' disposed about an anvil member lO"' having a square section shape. The connections will then be provided in the cor-ners. It is to be noted that under certain circumstances the connecting portions may be eliminated. This would mean in Figure 6 and 7 a closecl circular incision and in Figure 8 a closed square incision with the result that a small plate portion would be stamped fro~ the sheet adjacent the female die having the respec-tive contour. The appearance of the joint would then be very similar to a rivet head, however, after each joining operation the stamped out plate portion would have to be ejected from -the female die.
The male die according to Figure 9 is a twin die wherein two male dies according to Figure 1 are disposed side by side and are manufactured in an integral piece. One will see the two working faces 24a, 2~b and t`he respectively allocated flanges 28 extending or-thogonal to the cutting edges of the female die (not shown) and also define an apex angle of ~0. The cutting edges of the respective female die are similar to Figure 1 but somewhat ~25~73~
longer so that with one press stroke only two juxtaposed joints are produced.
Figure 10 and ll show a female die in which the support members are replacable.
The female die comprises a socket 118 having a planar bottom 120 parallel to the table of a press (not shown) and a planar clamping surface 122 which extends orthogonal to the bottom 120. A threaded hole 12~ extends into the socket from the clamping surface 122.
Support members 126, 128 and anvil member :l30 are sepa-rately produced components. Anvil member 130 is a stamped steel part while the support members are cut from spring steel and have each two cutting edges on both sides with respect to the anvil member. In the area of the cutting edges the support members are hardened or hard-coated and ground. Anvil member and support members have through-'noles which when assembled are aligned with the threaded bore 124, forces acting upon the components during the joining operation being transmitted to the socket because the support members and the anvil member engage the bottom Eace 120.
On the side of the support member 126 facing away from clamping surface 122 there is a clamping disc 13~ which also has an aligned through-hole. The entire assembly is clamped by means of a screw 136. Figure 10 illustrates the situa-tion prior to the final fastening of the screw so that it may be seen that the disc 13~ is outwardly bulged so to act as a resilient disc.
Its lower edge also abuts the bo-ttom face 120.
This embodiment has the advantage that the support members may be turned outside-in after t'neir cutting edges become worn and when the second pair of cutting edges also has become worn may be replaced. Moreover, -the anvil member also may be exchanged. Such an exchange will most probably not become due to the anvil member being worn, but another anvil member will permi-t the joining of sheet metal pieces having di-Eferent thicknesses, which requires a different spacing between cutting edges 132 and anvil working face l38.
The upper edge 140 of the disc is dispose~ on the same level as the upper edge 142 of clampiny surface 122 so that there are identical clamping conditions for both support ~embers.
As may be seen from ~igure 11 the support members have laterally cut off contour so that the bending tension duriny the lateral yielding is distributed in uniform manner over the length of the support members.
Claims (15)
PROEPRTY OR PRIVILGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for joining two overlapping sheet metal pieces wherein only one of said pieces is provided with incisions prox-imate to each other to define a joining area therebetween, comp-rising deforming said other piece at a site congruent with said area substantially perpendicular to the sheet plane thereof towards said one piece so as to deform said area until material of said other piece protrudes beyond the face of said one piece opposite said other piece, and compressing said protruding material whereby the latter flows sidewards in clamping engagement beyond the edges of said incisions opposite said other piece.
2. A method as set forth in claim 1 wherein said one piece is provided with two straight incisions parallel to each other.
3. An apparatus for joining two overlapping sheet metal pieces comprising a female die having a central anvil member and support members adjacent said anvil member, each support member projecting beyond a working surface of said anvil member and having cutting edges at the ends of said projections, said support members being adapted to flex away from said anvil member, and comprising further a male die adapted to be pressed towards said working sur-face of said anvil thereby deforming sheet metal pieces disposed between said dies, said male die having a working surface opposite said anvil working surface, said male die working surface being narrower than the distance spacing said support member cutting edges.
4. An apparatus as set forth in claim 3 wherein said male die tapers outwards from its working surface.
5. An apparatus as set forth in claim 4 wherein said male die is of rectangular cross section and has a trunco-pyramidal shape.
6. An apparatus as set forth in claim 4 wherein said male die is of circular cross section and has a trunconical shape.
7. An apparatus as set forth in claim 4 wherein said male die has tapering surfaces defining an apex angle of about 40°.
8. An apparatus as set forth in claim 4 wherein said male die working surface has rounded contour edges.
9. An apparatus as set forth in claim 8 for joining sheet metal pieces having a thickness of up to 2 mm and wherein said contour edges are rounded with a radius of about .5 mm.
10. An apparatus as set forth in claim 3 wherein said support members have straight cutting edges and the cutting edges of pairs of support members are parallel to each other.
11. An apparatus as set forth in claim 10 comprising two support members only.
12. An apparatus as set forth in claim 11 wherein said anvil member and said two support members are mounted on a common carrier.
13. An apparatus as set forth in claim 3 wherein said support members have cutting edges disposed on a common circle.
14. An apparatus as set forth in claim 13 wherein adjacent cutting edges of juxtaposed support members are spaced from each other.
15. An apparatus as set forth in claim 10 wherein four sup-port members are provided having their cutting edges disposed along a common square.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19848408792 DE8408792U1 (en) | 1984-03-22 | 1984-03-22 | Device for connecting sheet metal lying flat on top of one another by means of pressing through and extrusion |
| DEG8408793.5 | 1984-03-22 | ||
| DEG8408792.7 | 1984-03-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1250735A true CA1250735A (en) | 1989-03-07 |
Family
ID=6765022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000477092A Expired CA1250735A (en) | 1984-03-22 | 1985-03-21 | Sheet metal joining method and apparatus, and sheet metal joint |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS617026A (en) |
| CA (1) | CA1250735A (en) |
| DE (1) | DE8408792U1 (en) |
| SU (1) | SU1286099A3 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3640896A1 (en) * | 1986-11-29 | 1988-06-16 | Eckold Vorrichtung | METHOD AND DEVICE FOR RIVETLY JOINING SHEETS |
| DE3701895C1 (en) * | 1987-01-23 | 1988-03-17 | Audi Ag | Apparatus for joining elements resting flat upon one another, for example metal sheets, by the joggling method |
| DE3805688A1 (en) * | 1988-02-24 | 1989-09-07 | Eckold Vorrichtung | DEVICE FOR IMPLEMENTING SHEET METAL PIECES |
| DE3916817A1 (en) * | 1989-05-23 | 1990-12-13 | Thumm & Co | Joining two pref. metal sheets stacked on die using stamp - by driving material from top sheet into torn regions of bottom sheet created by downward action of stamp |
| DE4035210C2 (en) * | 1990-11-06 | 1999-09-09 | Bosch Siemens Hausgeraete | Method for joining two or more thin-walled workpieces lying flat on one another, device for carrying out the method and workpiece structure produced by the method |
| JPH04110435U (en) * | 1991-03-05 | 1992-09-25 | 株式会社クボタ | Binding device |
| JP4778604B2 (en) * | 2000-05-10 | 2011-09-21 | 積水化学工業株式会社 | Structural member joining method and joining apparatus |
| JP4746785B2 (en) * | 2001-07-17 | 2011-08-10 | 本田技研工業株式会社 | Metal plate joining equipment |
| NZ578770A (en) * | 2007-02-13 | 2012-06-29 | Inventio Ag | Clinching tool with conical die having double angled flank |
| PT2117747E (en) * | 2007-02-13 | 2011-07-25 | Inventio Ag | Method for clinching thick metal workpieces and use of a clinching tool |
| RU2520646C1 (en) * | 2012-12-19 | 2014-06-27 | Федеральное государственное бюджетное учреждение науки Институт горного дела Севера им. Н.В. Черского Сибирского отделения Российской академии наук | Crown bit grooved joint |
| RU2510449C1 (en) * | 2012-12-19 | 2014-03-27 | Федеральное государственное бюджетное учреждение науки Институт горного дела Севера им. Н.В. Черского Сибирского отделения Российской академии наук | Manufacturing method of attachment of cutters to housing of drill crowns |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5659539A (en) * | 1979-10-17 | 1981-05-23 | Toshiba Corp | Joining device of plate material |
| JPS5659540A (en) * | 1979-10-19 | 1981-05-23 | Toshiba Corp | Joining device of plate material |
| GB2087284B (en) * | 1980-09-08 | 1984-06-06 | Btm Corp | Apparatus for and method of joining sheet metal and sheet metal so joined |
-
1984
- 1984-03-22 DE DE19848408792 patent/DE8408792U1/en not_active Expired
-
1985
- 1985-03-21 SU SU853868330A patent/SU1286099A3/en active
- 1985-03-21 CA CA000477092A patent/CA1250735A/en not_active Expired
- 1985-03-22 JP JP5764585A patent/JPS617026A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| SU1286099A3 (en) | 1987-01-23 |
| JPS617026A (en) | 1986-01-13 |
| JPH0346207B2 (en) | 1991-07-15 |
| DE8408792U1 (en) | 1985-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |