JPS6127128B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for bending the edges of large area sheet metal materials, in particular arched materials forming tank bases, to exact dimensions.

The invention is suitable for use with a variety of large sheet metals, but is particularly suitable for bending sheet metal stock for tank bases.

[Prior art]

There is a base, called the tank base, which is welded to the end and side walls of the tank and also to the internal dividing wall of the tank. Tank bases such as these are generally rectangular with rounded sides and angles, with the radius on one long side often having a different radius than the radius on the other side. has. Irregular shapes are also often present. The entire base may be arched and curved about an axis parallel to the generally rectangular short sides.

In order to weld the base as described above to the tank body, the edge of the base must be welded so that the end face edge of the tank body, which is a pipe with a cross-sectional shape corresponding to the contour of the base, and the edge of the base are on the same plane. parts are bent or flanged.

[Problem that the invention seeks to solve]

Since each type of tank base is produced in only a few tens or hundreds in a single production run, it is uneconomical, for example, to produce deep-drawing tools for bending the edges. The dimensions of the base are usually more than 1 square meter, so the dimensions of the deep drawing tool are also quite large. Therefore, other people are used to bend the edges. In this method, each type of tank base requires a support whose contour matches the contour of the arched preformed tank base material. Bending is effected manually by manipulating a hammer so that the material of the metallic stock that projects beyond the support is bent along the contour of the support. The operation generates significant noise, requires a lot of effort and time, and also usually requires preheating of the edges of the material.

Also in the case of other large sheet metal materials whose edges have to be bent or flanged, the use of expensive stamping or deep drawing tools is only economical when producing large numbers.
Note that a large material means a material whose surface area is 2 to 4 orders of magnitude larger than its thickness.

It is an object of the present invention to provide a bending and flanging operation as described above, which has the advantage of being less expensive than operations using large tools, and which has the advantage of being faster and more accurate than manual operations. The objective is to provide a device for carrying out this process.

[Means for solving problems]

According to the present invention, a device for bending the edge of a stationary sheet metal material to have a predetermined curvature with accurate dimensions is provided with a substantially C-shaped yoke having two arms, A flanging tool is provided on one arm, the flanging tool including a hydraulic ram adapted to force the pad support against the other arm of the yoke; a template member disposed between the arms of the pad support, the template member providing a surface having the predetermined curvature for the pad support, and the yoke being pivotable about the center of curvature of the template member. and the pad support is
a first pad adapted to engage a first point near an edge of the sheet metal blank, and a point inboard of the first point of the sheet metal blank and beyond the center of the curvature; and a second pad adapted to engage the sheet metal blank at the yoke, the yoke being movable along an edge of the sheet metal blank.

In one embodiment of the device of the invention, the template member is comprised of a tube that conforms to the contours of the sheet metal blank, and said other arm of the yoke is capable of engaging the template member and said tube of the template member. It supports a clamping wheel with a complementary contour.

In another aspect of the invention, a template member is removably attached to the other arm of the yoke, and a pair of guide members are hinged to the yoke, the guide members having a pressure force cooperating with the template member. A pad is pivotably mounted, and a bending lever is pivotably mounted on the guide member and has a pressure pad that cooperates with the template member to effect the bending of the edge of the blank.

In another aspect of the invention, the flanging tool includes a matrix having a working surface, the working surface being contoured asymmetrically with respect to the template member and having a support and a device that initially contacts the material during use. and a bending section that performs bending of the material around the template member during the pivoting movement of the template member.

In yet another aspect of the invention, the yoke is comprised of first and second jaws hinged to each other, and the second jaw supports a template member.

[Examples and their effects]

Next, specific examples of the apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 illustrate the entire device for bending the edge of a tank base, and FIGS. 4 to 9
The figures only illustrate flanging tools or equipment that were originally designed specifically for flat materials or workpieces.

FIG. 1 shows an arched preformed tank base blank 10 supported on a tubular frame 12 whose contour corresponds to the curvature of the blank. Frame 12 is supported on rotary table 14 . A lifting mechanism 18 lifts the individual material 10 from the layer 16 and transfers it to the frame 12.
used for placing on top. This lifting mechanism consists of an arm 20 pivotably mounted on a fixed stand 22 and a piston-cylinder unit 24.
and a pressure plate 26 attached to the arm 20 via. The rotating arm 20 is the suction means 2
8, the suction means 28 lift the material from the layer 16 and the pressure plate 26
4 to hold the material as it is lowered and aligned with the frame 12. Of course, frame 12
The table 14 stores materials of various shapes and sizes.
It is replaceable so that it can be supported on top.

Apparatus 30, shown in detail in FIG. 3, is located adjacent to table 14. Figures 1 and 2
As shown in the figure, the device 30 is swingably, pivotably and rotatably suspended. This device 30 is installed at the end of a carrier arm 32, which has a gallows-shaped balancing mechanism.
like balancing mechanism). The balancing mechanism comprises a post 34 supporting a head 38 which can be raised and lowered by a hydraulic piston-cylinder unit 36. A transverse arm 40 pivotally mounted within the head 38 at 42;
supports a carrier arm 32 at one end and a counterweight 44 at the other end. A guide arm 46 completes the mechanism and guides arm 4
0 to form a parallelogram arrangement. A unit 48 for supplying pressurized working fluid includes a high pressure hose 5
0 to device 30. device 30
further supports a controller 54 for unit 48 and unit 36. The fluid may be liquid or gas.

The design is such that, by rotating the table 14, each part of the base material can be successively positioned within the working area of the device 30 determined by the extension of the transverse arm 40. .
When the flanging work is completed, the finished tank base is lifted onto the frame 1 by the lifting mechanism 18.
2 and placed on layer 52 of the completed base.

The device 30 includes a generally C-shaped yoke 60. The lower arm 62 of this C-shaped yoke 60
A hook-like mechanism that can engage the lower side of the template tube 12 is disposed therein. The mechanism comprises a clamping wheel 64 whose asymmetrically designed profile has a radius of curvature corresponding to the outer diameter of the tube forming the frame 12. The clamping wheel is rotatably mounted on the lower arm 62 by a pin 66.

The upper arm 63 of the yoke is a hydraulic cylinder.
A pad support beam 74 supports the cylinder of the piston unit 68 and is hinged to the piston 70 of the unit 68 by a pin 72.
The axis of the piston rod is aligned perpendicularly to the axis of the pin 66. Each of the two arms 76 and 78 mounted at right angles to the support beam 74 includes a pin 8.
Pressure pads 80 and 82 are hinged by 4 and 86. As can be seen from FIG. 3, pins 84 and 86 are at different distances from the axis of the piston rod.

The operation of the above device is as follows.

After tank base blank 10 is placed on frame 12, blank 10 is aligned and securely clamped by mechanism 18. piston
Cylinder unit 24 exerts downward pressure on blank 10 via pressure plate 26 to securely hold the blank against frame 12. The flanging device 30 is then brought to the stock by the operator without the need for power due to the counterweight of the device described above. hydraulic cylinder 6
8 piston 70 is retracted, and the clamp wheel 6
4 is placed under the tube 12, and the rotating wheel 64 is brought into contact with the corresponding part of its outside against the tube 12, after which the piston 70 is extended. This places a pair of pressure pads 80 and 82 on the upper surface of blank 10 such that pad 80 applies a clamping force to the blank and pad 82 begins bending the edges of the blank. As the piston 70 further extends, the pad 82
The outer edge area of the holder is pressed downwardly so that in a first operational step the edge area is advantageously bent downwardly at an angle of about 45°.

This process is repeated progressively around the entire circumference of the material. It is possible to process an entire side of a rectangular blank by moving the device 30 along the edges of the blank, after which the table 14 is rotated approximately 90 degrees. The position of device 30 during this initial stage is illustrated in FIG. After the entire circumference has been treated, the device 30 is rotated counterclockwise while the clamping wheel remains adjacent to the template tube, and the above process is repeated until the edge area of the blank is completely flush with the surface of the blank. It is then tilted as desired.

Note that the bending at any point on the circumference of the blank will be of different dimensions due to the arched shape of the blank. As such, it is possible to simplify the work if the angular position of the clamping wheel 64 is predetermined for two operating phases, or at least for the second operating phase, for example by a stop on the table. can be converted into Figure 3 illustrates the final position, the bend being completed. 1st
Also shown in the figure is a foot switch 90 that controls the rotation of table 14.

For automatic guidance of the device 30, the device 30 is provided with drive elements for automatically advancing the device along the edges of the blank.

Although not essential, the support means for the workpiece and the suspension means for the flanging apparatus described with reference to FIGS. 1 and 2 may be incorporated into the apparatus illustrated in FIGS. 4 to 9. It can also be used together.
However, if desired, a simple support frame that supports the workpiece generally horizontally so that the edges of the workpiece can be freely accessed for bending or flanging operations may suffice.

The device shown in FIGS. 4 to 7 includes a yoke 110 that is approximately C-shaped. This yoke 110
can be suspended from a counterbalanced support structure, as described above. A supply line for supplying pneumatic or fluid power to pressure pad 114 is indicated at 112.

A support member, in this case an anvil 118, is attached to the lower arm 116 of the yoke 110. In this specific example, anvil 11
8 has a flat clamping surface 120 that extends at least approximately perpendicular to the axis of movement of the pressure pad 114 and to the template area 122. Template area 1
The contour of 22 determines the shape of the bend applied to the material. Because the ampilling 118 has a clamping surface 120, a fixed support member is not necessary.

The central portion 124 of the yoke 110 includes a pin 12.
8, a guide member 126 is rotatably installed. The free ends of the guide members 126 are connected by connecting bolts 130. The axes of pin 128 and bolt 130 are parallel to each other and to clamping surface 120.

A pressure pad 132 is installed on the connecting bolt 130. As shown in FIG. 5, pressure pad 132 has two symmetrical support arms 134;
It has a U-shape as shown in FIG. A bending lever 136 is installed in the central part of the connecting bolt, which bending lever 136 has an upper surface formed as a curved cam path 138 . A pressure pad 140 is replaceably installed at the free end of the bending lever. Of course, the unpillar 118 can also be replaced.

The pressure pad 114 is as shown in FIG.
Contact cam path 138. The profile of the bending lever is such that the cam path 138 always projects upwardly from the guide member 126, so that the pad 114 remains in the cam path 1 even when the pad 114 is in its lowest position shown in FIG.
38 to apply pressure. Each time pad 114 is fully retracted,
Pressure pad 132, whose underside faces clamping surface 120, is relaxed.

A stop 142 is laterally mounted below pin 128 for movement through the central portion of yoke 110. It can also be provided with stops at both ends so that it can be moved in both directions along the edge of the workpiece during operation.

Bent pad 14 illustrated in FIGS. 4 and 5
0 is simply provided with a flat end face facing the sheet metal. However, using a bent pad as shown in FIGS. 6 or 7,
Better bending can be achieved. Bent pads 140' and 1 shown in FIG. 6 or 7
40'' has an end face or face facing the material that is divided into three parts.The central part 141 is solid and formed integrally with the foot plate 144;
A screw hole or the like for attaching to the bending lever 136 is provided on the side of the foot plate 144 that is remote from the portion 141. Elastic cushioning material 143 is attached to the foot plate 144 on both sides of the solid central portion 141. Each of the cushions has a face plate 145 that can protrude somewhat from the contact surface of the central portion 141 when the device is at rest.
During operation, the face plate 145 is displaced somewhat flexibly relative to the edges of the blank, and the actual bending force is applied to the solid central portion 14.
Added by 1.

In the specific example shown in FIG.
5' is adapted to be supported by a flange 147 formed on the E-shaped foot plate. Therefore, the support provided by the cushioning material 143' is flexible only near the solid central portion (not shown in FIG. 7), and the opposing faceplates 145' are sloped around their respective support flanges.

For the embodiment illustrated in FIGS. 1-3, in which the device pivots about a support frame 12, a second
In the specific example, the workpiece is on the clamping surface 120
and the movable pressure pad 132, so that the position of the C-shaped yoke remains stationary relative to the workpiece to be machined as the bending is performed. Only the bending lever 136 is pivoted. The operation of the apparatus illustrated in FIG. 4 is somewhat more complex than that of the apparatus illustrated in FIG. If you do it, you can simplify it.
The embodiments illustrated in FIGS. 8-10 are so designed.

The specific example shown in FIG.
52 and a C-shaped yoke 150 with a pressure pad 154. A solid patrix is fixed to the pad 154, and the anvil 1
The bending template in the form of 60 has a yoke 150
is attached to the lower arm 158 of the. Of course,
Patricks 156 and ampills 160 are interchangeable. As in the above case, the stopper 162
is provided.

The matrix 156 has a wide support foot 164 spaced from the stop 162, a bent foot 166 adjacent the stop 162, and a concave surface 168 in the area therebetween. Bending foot portion 166
is considerably narrower than the support foot 164 when viewed in a direction perpendicular to the plane of the paper of FIG. Furthermore, at the beginning of the bending operation, the distance between the contact area between the workpiece and the support foot and the contact area between the workpiece and the ampil is such that the distance between the contact area between the workpiece and the ampil and the bending foot and the workpiece is clearly larger than the spacing between the contact areas. As a result of these features, there is no deformation of the material in the region of the support foot during the pressing stroke of the pad 154. on the other hand,
Since the entire device pivots around the area of contact between the blank and the foot, the edge of the sheet metal blank is squeezed around the ampil by the bending foot. The contour of the bending foot is illustrated in FIG.

In the embodiment illustrated in FIG. 10, the C-shaped yoke has joists that are not integral but hinged to each other. Lower Jiyo 170
is connected to cylinder 172 of a hydraulic piston-cylinder unit. The piston of the unit engages the upper jaw 178 so that the upper jaw 173 pivots around the connecting bolt 174. The upper jaw supports the Patricks and the lower jaw supports the anvil. The matrix and anvil are designed similar to that described with reference to FIGS. 8 and 9. In FIGS. 8 and 9 the stop is designed similarly to that in FIG. 4, but in the case of FIG.
6 is L-shaped. The lower transverse arm of the stop 176 is provided with a longitudinal hole for adjustment, and the vertical arm defines the insertion depth of the device at its edge facing the anvil.

〔Effect of the invention〕

Since the device of the present invention has a relatively simple structure and is compact, it is less expensive than using a large tool, and can perform bending quickly and accurately. In addition, since the device of the present invention is completely independent of devices for supporting and fixing sheet metal materials, it can be widely used for bending various materials with different sizes and shapes, and can be used for general purposes. It has the advantage of being highly flexible.

[Brief explanation of the drawing]

Figure 1 shows a model suitable for bending the tank base.
1 is a simplified side view of an apparatus including a first embodiment of the invention; FIG.
2 is a plan view of the apparatus of FIG. 1; FIG. FIG. 3 is an enlarged side view of the flanging tool, including a partial cross section, and FIG. 4 is a side view of the flanging tool according to a second specific example of the present invention. FIG. 5 is a left side view of the tool of FIG. 4. FIG. 6 is a perspective view of a partially modified version of the tool shown in FIG. 4; FIG. 7 is a partial perspective view of still another modification of a part of the tool shown in FIG. 4; FIG. 8 is a side view of a flange processing tool according to a third embodiment of the present invention. FIG. 9 is a bottom view of the matrix shown in FIG. 8. FIG. 10 is a side view of a fourth specific example of the present invention. 10... Sheet metal material, 30... Bending or flange processing device, 60, 110, 150... Yoke, 6
4... Clamp car, 80, 82, 114, 154
...Patsudo, 118,160...Anvil, 12
0...Clamp surface, 170...Downward jaw, 17
3...Kamigata Jiyo.

Claims (1)

[Claims] 1. A device for bending the edge of a stationary sheet metal material into a predetermined curvature with accurate dimensions, comprising a substantially C-shaped yoke having two arms. , a flanging tool is provided on one arm, the flanging tool includes a hydraulic ram adapted to force the pad support against the other arm of the yoke, and the flanging tool includes a hydraulic ram adapted to force the pad support against the other arm of the yoke. a template member disposed between the other arm, the template member providing a surface having the predetermined curvature for the pad support, and the yoke pivoting about the center of curvature of the template member. and the pad support includes a first pad adapted to engage a first point proximate an edge of the sheet metal blank and a first pad adapted to engage a first point proximate an edge of the sheet metal blank; and a second pad adapted to engage the sheet metal blank at a point beyond the center of curvature, the yoke being movable along an edge of the sheet metal blank. Featured device. 2. The template member is constructed from a tube adapted to the contour of the material, and the other arm of the yoke supports a centering element that can be engaged with the template member. equipment. 3. Apparatus according to claim 2, wherein the centering element is a clamping wheel with a contour complementary to the contour of the tube. 4. The template member is removably attached to the other arm of the yoke, and the profile of the template member is such that, in use, the edge of the material to be bent by movement of the flanging tool is 2. The apparatus of claim 1, further including stop means such as to be squeezed around the template member and further for defining a line of bending with respect to the edge of the blank. 5 a pair of guide members are hinged to the yoke, a pressure pad for cooperating with the template member is pivotally mounted on the guide members, and a bending lever is pivotably mounted on the guide members; 5. Apparatus according to claim 4, wherein said bending lever includes a pressure pad which cooperates with said template member to effect the bending of said edge of said blank. 6. The device of claim 5, wherein said pressure pad has a solid central portion and resiliently supported face plates on either side thereof. 7. The device of claim 6, wherein the face plate is pivotably supported at a location remote from the central portion. 8. The flanging tool is provided with a matrix having a working surface, and in use, the working surface contacts the material and the device pivots around the contact between the working surface and the material. 5. Apparatus according to claim 4, wherein the working surface is contoured asymmetrically with respect to the template member so that bending of the edge of the blank is effected. 9. The working surface has a support part with which it first comes into contact with the material in use and a bending part which performs the bending of the material around the template member during a pivoting movement of the device; 9. The device of claim 8, wherein the portion is wider than the bent portion. 10 In use, the area of initial contact between the template member and the blank is separated by a distance greater than the distance that separates the area of initial contact between the bend and the blank. 10. The device of claim 9, wherein the support initially contacts the material in the area where it is attached. 11. Claims in which the yoke comprises first and second jaws hinged to each other, the first jaw supporting the matrix and the second jaw supporting the template member. The device according to paragraph 4. 12. The device of claim 1, including a mechanism for supporting the device in a working position, comprising means for suspending the device from a support and means constituting a counterweight for the device. 13 Claims comprising a support for supporting the material during bending operations and a rotary table on which the support is installed so that the entire outer peripheral area of the material can be moved to the working position of the device The device according to paragraph 1.