EA010919B1 - Rotary apparatus with multiple guides and method of rotary forming - Google Patents

Abstract

A rotary forming apparatus of the type having a pair of central rotors, and one or more die carriers swingably mounted on the rotors, for repeatedly forming a sheet metal work piece moving along a linear path, rotor bearing supports for supporting the rotors at least at one end thereof, die carrier guides on the die carriers at an end thereof adjacent to the rotor bearing supports, and, at least two cam plates adjacent to each the rotor bearing support, for guiding the die carriers guides.

Description

FIELD OF THE INVENTION

The present invention relates to sheet metal stamping using a rotary stamping device using stamps mounted on a rotary device to create rotation and subsequent contact with sheet metal, and to such a device in which there are several guides for the rotary device, and to a sheet metal stamping method.

BACKGROUND OF THE INVENTION

Racks made of sheet metal (thin-walled profiles) with a simple C-shaped profile have been manufactured for a long period, at least since the 1930s. In U.S. Pat. Nos. 2,088,781 and Canada, 119,115, proposals were made for punching holes in sheet metal racks.

Stamping these holes is a difficult task. In machines equipped with dies moving in a circular path, sheet metal moves along a linear path. Over a short period of time, a slight change occurs between the linear speed of the dies per se and the linear speed of the sheet metal. The specified change in speed causes the deformation of the sheet metal. In addition, in rotary devices, the planes of each of the dies in any pair should be brought parallel to each other immediately before closing on sheet metal, and they should be in a parallel position throughout the entire closing time and after opening for a certain period of time. The stamps themselves are mounted on matrix holders that are mounted on pivot bearings. Guide rollers are installed along both the front and rear edges of the matrix holders. The front and rear guide rollers must move along different paths as they rotate.

There is also a need to adjust the rotation speed to match the linear speeds of the matrix holders with the linear speed of the sheet metal.

In addition, it may also be desirable to create a rotary device in which only one end of each of the shafts rests on the supporting elements, while the opposite end of each shaft is not provided with a support. This type of "open" (cantilever, single-column) rotary device may have advantages over the more well-known design.

SUMMARY OF THE INVENTION

The invention includes a rotary stamping device equipped with a pair of central rotors and one or more matrix holders, mounted rotatably on the rotors, with supporting elements of the rotors to support the rotors at least at one end thereof, characterized in that it comprises guides of the matrix holders located on one the end of the matrix holders next to the supporting elements of the rotors, and at least two cam discs located next to each supporting element of the rotor, to give direction guide matrixholding.

Preferably, there are two rotor support elements, one at each end of the rotors, and cam discs are mounted on one of said support elements.

Preferably, there is a first cam disk and a second cam disk, consisting of two parts forming a groove (passage) for the guide matrix holders.

Preferably, the rotors are driven by an electric motor with an adjustable rotational speed and include a control device for controlling the rotational speed of the motor in synchronization with the movement of the metal sheet.

Preferably, the control device increases the engine speed in one position and reduces the engine speed upon reaching the second position, and then again increases the engine speed.

Preferably, there are two rotors, each having a first end and a second end, a rotor support member supporting one end and two separate support members supporting the other end.

Preferably, there are several matrix holders and several rotors.

Preferably, there is a guide bridge on the second rotary guide cams to provide contact with the guide roller in one position during rotation.

The invention also provides for the creation of a method of stamping sheet metal billets.

Brief Description of Drawings

FIG. 1 is a perspective view of a rotary device illustrating the invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG. one.

FIG. 3 is a perspective view of one form of a rack blank, the type of which can be made using the device of FIG. 1 and 2.

FIG. 4 is a side view of FIG. 3.

FIG. 5 is a perspective view of a matrix holder illustrating an installed stamp without a rotary device.

FIG. 6 is a side view of the matrix holder.

- 1 010919

FIG. 7 is a front view of one end of the matrix holder.

FIG. 8 is a perspective view of a plate of a rotor support member and cams at the right end of FIG. one.

FIG. 9 is a perspective view of the rotor support member of FIG. 8.

FIG. 10 is a perspective view of the left plate of the support element of the rotor of the device of FIG. one.

FIG. 11 is a perspective view of the support member of FIG. 10.

FIG. 12 is a perspective view of the first and second parts of the cam disk.

FIG. 13 is a perspective view of parts of a cam disc in FIG. 12.

FIG. 14 is a perspective view of a semi-curved part of the cam.

FIG. 15 is a perspective view of a half-curved portion of the cam disk of FIG. 14.

FIG. 16 is a perspective view of a solid cam guide.

FIG. 17 is a side view of FIG. sixteen.

FIG. 18 is a bottom view of FIG. sixteen.

FIG. 19 is a perspective view of the right support plate of FIG. 8.

FIG. 20 is a perspective view of FIG. 19, illustrating cam rollers of the upper and lower rotors when they are in top dead center position.

FIG. 21 is a perspective view of another exemplary embodiment of a device designed for one-sided processing of sheet metal workpieces.

FIG. 22 is a side view of the device of FIG. 21.

FIG. 23 is a front view of the device of FIG. 21.

FIG. 24 is a table that shows the values of changes in rotational speed before, during and after contact to the point of separation of stamps from sheet metal.

FIG. 25 is a perspective view of another embodiment.

FIG. 26 is a side view of FIG. 25.

FIG. 27 is a block diagram of a speed controller for increasing and decreasing rotor speed.

Description of a specific embodiment

The present invention relates to a rotary device for rotational stamping of various shapes and holes in a sheet metal blank.

For example, when cutting holes in thin-walled profiles, it is necessary to observe the length of the segment between two holes. The device provides means for positioning the holes and means for temporarily skipping the hole in order to maintain a longer length of sheet metal on which cutting can be performed.

The sheet metal blank has a central jumper 10 and two lateral bends of the edges 12 and 14. The central jumper is formed with a series of holes 16. In this case, these holes have a generally triangular shape, and the orientation of each triangle changes along the length of the jumpers. Due to this, sheet metal spacers 18 are located between adjacent openings 16. These spacers 18 are generally zigzag or diagonal in shape, located along the length of a sheet metal blank. Flanges 20 are formed around the openings 16.

The longitudinal lateral bends of the edges 12 and 14 are longitudinally continuous along the length of the sheet metal billet. One such bend may be sufficient, or in other cases two or three such bends may be made to provide higher strength or for various other applications. In some cases, one of the side edges can be bent outward, forming a hook 22, as shown by the line of an imaginary contour. Such a hook 22 is used in the manufacture of combined building panels of concrete and racks from a thin-walled profile.

Typical anchor flanges are shown in US Pat. No. 4,602,467. This patent relates to known C-profile posts.

Pressed anchor parts 22 are used in the manufacture of thin-walled panels for fencing buildings. The racks or parts are sealed at a certain distance from each other, for example 16 inches (40.64 cm), or two feet (60.96 cm) along the length of the panel, and the upper and lower parts are also connected to a rectangular grid.

Parts or racks of thin-walled profiles have been illustrated in US Pat. Nos. 2,088,781 and 2,167,666.

However, the rack of the specified general type is only one of many manufactured products. High productivity, excellent manufacturing accuracy and, in addition, production flexibility allow the manufacture of parts of different widths, different lengths and with various stamped parts.

In FIG. 1 and 2, the rotary device 30 is illustrated. The rotary device 30 includes the upper and lower central rotors 32 and 34 assembly. In this embodiment, each rotor is equipped with two die holders 36. Each die holder 36 serves as a support for the die 38. The dies 38 are similar in almost all respects to the known movable and fixed dies used in stationary presses, that is, presses that reciprocate

- 010919 placement in the vertical direction, but not rotate.

In this embodiment, each of the central rotors 32 and 34 includes a relatively thin central shaft 40 and two massive end support shafts 42. Each of the end support shafts 42 is installed in the respective support systems 44, and in turn, the support systems 44 are installed in the end plates 46 and 48. End plates 46 and 48 are typically mounted on beds 50 so that they are mounted in a production line. The upper and lower rotors 32 and 34 are connected by means of a lower drive gear 52 mounted on the shank 54 of the lower end rotor support shaft 42 and an upper gear assembly 56 mounted on the shank 58 of the upper rotor end support shaft 42. The shank 54 of the end shaft of the lower rotor is designed to connect to any acceptable motor 60 and gearbox. Typically, in this case, the motor may be an electric DC motor (FIG. 26). The engine 60 is equipped with a speed controller 62, providing precise adjustment and change of the engine speed. The operation of the speed controller 62 is in turn controlled by a central processor. The top gear assembly 56 includes a main gear 64 and an external backlash-free compensation gear 66. The backlash-free compensation gear 66 can be rotatable to adjust with respect to the main gear 64 and secured so that any play between the top gear assembly 56 is secured. and a lower drive gear 52. Each of the four end support shafts 42 is substantially uniform in shape, with the exception of the shanks of the shafts.

Each of the end support shafts 42 is provided with two support recesses 68 located at a distance of 180 ° from each other about the axis of each rotor. Within each support recess there is a support, or sleeve 70, held in position by an acceptable plug.

Each of the matrix holders 36 in FIG. 5, 6 and 7 are provided with an end short shaft 74 at each end thereof. The short end shaft 74 is mounted in the supports 68 in the support recesses 68 of the end support shafts 42. Due to this, each of the matrix holders 36 is able to rotate around an axis extending between the two short shafts 74. Each matrix holder 36 is formed along its entire length by a generally flat receiving zone 76 on FIG. 5 facing outward with respect to the rotors 32 and 34. A generally convex profile 78 is formed on the back of each matrix holder 36 for each matrix holder 36.

Separate matrix holders 36 are mounted on both the upper and lower rotors 32 and 34, each of which is equipped with a shaped stamp 38. However, the invention is not limited to the use of two matrix holders on each rotor. In this case, four matrix holders were used.

Two rotors rotate in opposite directions, while one rotates clockwise, while the second rotor rotates counterclockwise, and they are connected by gears 52 and 56. Thus, the upper and lower dies 38 on the matrix holders 36 are reduced to align each other with the other at approximately the closest point of the two rotors 32 and 34, i.e. at approximately 180 and 360 °, respectively, and then they are gradually diverted from each other.

The matrix holders are at a maximum distance from each other at approximately 90 and 270 °. The dies 38 on the matrix holders 36 on the upper rotor 32 are usually movable dies, while the dies 38 on the lower rotor 34 are usually stationary dies, or dies with a recess. Parts of the sheet metal that are actually cut from the sheet metal blank produce waste or so-called die cuts, and said die cuts are temporarily located in the recess of the dies 38 on the lower rotor 34 and are removed using suitable ejector pins 80, the description of which will be given below. The ejector pins 80 of the dies are driven by transverse ejector pins 82 mounted in the lower rotor 34 and having end sections 82 extending outwardly towards one end of the lower rotor 34. The inner ends 84 of the rods 82 are made with an inclined surface 86, and when the rods 82 are moved the inwardly inclined surfaces 86 engage with the ejector pins 80, as a result of which they push the notches out of the die 38. Under the action of the force of the springs, the rod 82 moves away in the opposite direction, and the outlet Nailing pins 80 are also produced using springs.

The sequential operation of each rod 82 of the pusher of the stamp is achieved using the working roller 88 mounted on the end plate 48 (Fig. 2).

Guide mechanism of the matrix holder.

The guide mechanism of the matrix holders 36 includes first cams 90 and second cams 92 mounted on end plates 46 and 48 near each end of each of the rotors 32 and 34. The first cams 90 are solid plates having a substantially oval shape, as shown in the drawings. From FIG. 12, 13 and 14 that the second cams 92 comprise a first generally oval-shaped central part 94 of the cam and a second half-curved part 96 of the cam (FIGS. 15-17). The oval part 94 and the half-curved part 96 form a roller channel 98 between them, and at each end

- 3 010919 countries there is actually a passage 100 and 102. An explanation of the function of the aisles will be given below.

The first and second cams 90 and 92 and the half-curved parts 96 are mirrored on both right and left side support plates 46 and 48 and are also aligned with both the lower rotor 34 and the upper rotor 32. Thus, there are four first cams 90, four second cams 94 and four half-curved parts 96.

Each of the matrix holders 36 is provided with front guide rollers 104 and rear guide rollers 106 located in contact with the front and rear edges of their respective matrix holders 36 and equally spaced on opposite sides from the central axis of the short shaft 40 of the matrix holders. The front guide rollers 104 are mounted on rollers 108 that bias the front guide rollers outward with respect to their respective matrix holders 36. The rear guide rollers 106 are mounted on rollers 110, which position the rear guide rollers 106 closer to their respective matrix holders than the front guide rollers 104. This displacement of the front and rear guide rollers allows the front and rear guide rollers to roll along the respective first and second cams 90 and 92, and thus, to track the front and rear guide surfaces having different profiles formed by the first and second guide cams 90 and 92, respectively. It will be apparent to those skilled in the art that as the rotors 32 and 34 rotate, the matrix holders rotate 360 ° with their respective front and rear guide rollers 104 and 106, making contact with the respective first and second cams 90 and 92. The guide surfaces formed by the front and rear guide rollers 104 and 106 intersect twice at each 360 ° revolution. The intersection of these two surfaces occurs at the passages 100, 102 formed between the second cam disc 94 and the half-curved part 96 of the cam.

The half-curved parts 96 of the cam are formed by additional guide rails 112 for the front and rear guide rollers at the point of closing and opening of the matrix holders (see Fig. 15-17). Such guide rails 112 are formed by two upper and two lower gently sloping curved surfaces 114 and 116, the arrangement of which provides contact with the front and rear guide rollers 104 and 106, respectively, from the point immediately before closing, during closing and opening after the matrix holders diverge. These guide rails 112 are integrally formed with half-curved cam parts 96 and are mounted together with the first and second guide cams 90 and 92, as shown in FIG. nineteen.

The operation of the device.

In operation, the lower and upper rotors 32 and 34 rotate in opposite directions, as shown, for example, by the arrows in FIG. 1, and a sheet metal blank, designated ^, passes between them. The rotation of the lower and upper rotors causes their respective lower and upper matrix holders 36 to rotate, a pair of lower and upper matrix holders 36 gradually converges to contact with the sheet metal. As soon as they close, the dies 38 pierce and / or stamp the metal and then open again, moving away from each side of the sheet metal. During the closing and opening of the upper and lower matrix holders 36, the linear speeds of the matrix holders 36 vary insignificantly and do not exactly correspond to the linear ones soon sti sheet metal moving at a constant speed. Immediately before closing on the sheet metal, the matrix holders 36 will move linearly at a lower speed. When the rotors 32 and 34 are located in the upper and lower dead points (180 and 360 °), the linear velocity of the matrix holders will correspond to the linear velocity of the thin-sheet metal billet.Then, the linear velocity of the matrix holders 36 decreases with respect to the speed of the thin-sheet metal billet after they are opened.

In order to solve this problem, the operation of the engine 60 is controlled by a speed controller 62 and a central processor to instantly increase the speed of rotation of the lower and upper rotors 32 and 34 at a point immediately before closing and to further gradually reduce the speed of rotation of the rotors as the rotors retract the matrix holders 36 to the lower and upper dead points, and then the engine again increases the speed of rotation of the rotors when breeding matrix holders. Then, the speed controller 62 adjusts the speed of the engine, maintaining it normal until the next pair of matrix holders 36 begins to move directly to the closing point. Such a sequential instantaneous increase in speed, followed by a decrease, followed by an increase in speed and then again decrease, occurs in accordance with the increments, with the maximum increment taking place at the position of the maximum angular displacement of the matrix holders relative to 180 and 360 °. During closing and opening, each increment gradually decreases as the angular displacement of the matrix holders 36 gradually decreases from the point before contact to the dead point and then again gradually increases from the dead point to the breaking point. The increments of speed changes are shown in the table in FIG. 24.

Due to this, the matrix holders have the ability to move along a curved path in

- 4 010919 the point immediately before closing and after opening, at which their linear velocity is identical to the linear velocity of the sheet metal billet.

This feature of the control mechanism also allows the rotors 32 and 34 to instantly stop or make movement with passes in order to create an interval between the stamped parts in a sheet metal billet. It is necessary to make racks of a certain length. At the upper and lower ends of each rack, the metal must be solid without any holes. By programming the central processor, the engine can be instantly stopped at a point at which, for example, the matrix supports are approximately 90 ° and 180 ° on either side of the top or bottom dead center. At this point, the thin-sheet metal blank V can freely pass between the rotors 32 and 34. The thin-sheet metal blank V is usually cut to a predetermined length with acceptable scissors (not shown) located behind the rotors 32 and 34. The work of the scissors can be synchronized with the holes in the holes formed in a sheet metal billet, in order to ensure a given length of the part.

An additional feature of the controllability of the engine that controls the speed of rotation of the rotors 32 and 34 is that it allows you to change the distance of the centers of the holes and stamped parts made in a thin metal blank V. The central processor is reprogrammed to ensure that the rotors 32 and 34 operate at a sufficient speed between the upper and bottom dead center with short stops when the matrix holders are in positions 90 and 270 °.

This will allow the thin-sheet metal billet to pass between the rotors without the impact of matrix holders and stamping on it.

Additional embodiments of the invention.

In some cases, it may be desirable to create an “open” (cantilever, one-post) rotary device in which only one end of the rotors is supported, while the other end of the rotor is not provided with a support element. Such further embodiments of the rotary devices are illustrated in FIG. 21, 22 and 23. The basic design of the rotors 32 and 34 and the matrix holders 36 is basically the same as described above, except that the matrix holders 36 are provided with front and rear guide rollers, cams and cam parts in only one end plate. The outer ends of the lower and upper rotors 32 and 34 are supported by massive transverse beams 120 and 122 and supporting brackets 124 and 126, which provide support for the outer ends of the rotors 32 and 34.

Due to this, the thin-sheet metal blank V can be set to the desired position from the side of the opening in the device, as shown in FIG. 21, and stamping will be carried out using rotors, matrix holders and dies mainly in accordance with a similar method as described above.

One edge of the workpiece may protrude outward between the brackets 124 and 126.

This provides a high degree of flexibility when using the device.

In some cases, it may be desirable to create another guide system in order to achieve a smooth transition from the surface of the second cam 94 and the half-curved part 96 of the cam. As shown in FIG. 25 and 26, to effect such a change, the swing arm or bridge 130 may be rotatably mounted on each of the half-curved parts 96 of the cam. The bridge 130 is able to rotate between open and closed positions and guide the front and rear guide rollers 104 and 106 as they separate from the semi-curved parts 96 of the roller and move to the guide bars 116. The bridge 130 is provided with a protrusion 132 that intersects the trajectory of the rear guide roller 106. Spring 134 connects the bridge 130 and the guide bar 112. In FIG. 25 and 26 illustrate the bridge in two positions, namely, in the open - the upper bridge and in the closed - the lower bridge.

Under the influence of the spring 134, the bridge 130 moves to the closed (lower) position, as shown in FIG. 25, and rotates to the open (upper) position (Fig. 26), if necessary, rotation forward or backward.

Claims (13)

CLAIM 1. A rotary stamping device equipped with a pair of central rotors and one or more matrix holders mounted for rotation on the rotors for multiple stamping of thin-sheet metal billets moving along a linear path, and containing supporting elements of the rotors for supporting the rotors at least at one end thereof ; matrix holders on said rotors and matrix holder rails located at one end of the matrix holders next to the supporting elements of the rotors, - 5 010919 characterized in that it includes at least two cam discs located next to each rotor support element at least at one end to give direction to said guide rails of the matrix holders, and passages in the cam disks for passing said guide rails of the matrix holders. 2. The rotary stamping device according to claim 1, characterized in that it is provided with two supporting elements of the rotors, one at each end of the rotors, and cam disks are mounted on one of these supporting elements, while the other supporting elements are not equipped with such cam disks. 3. The rotary stamping device according to claim 1, characterized in that it is provided with at least a first integral cam disk and a second cam disk consisting of at least two parts, while the second cam disk forms a passage through which the guides of the matrix holders can pass . 4. The rotary stamping device according to claim 3, characterized in that the matrix holders form a front and rear edges, including guides of the matrix holders on at least one specified leading edge and on one specified trailing edge. 5. The rotary stamping device according to claim 1, characterized in that it is equipped with an engine with an adjustable rotational speed and includes a control device for periodically decreasing and increasing the rotational speed of the engine in synchronization with the movement of the metal sheet. 6. The rotary stamping device according to claim 3, characterized in that it is provided with a second cam disk having a generally oval cam part and a half-curved cam part located at a distance from said oval part and a guide channel formed between said oval part and half-curved part. 7. The rotary stamping device according to claim 6, characterized in that the passages are formed between the ends of these semi-curved parts and an oval part. 8. The rotary stamping device according to claim 7, characterized by leading edges of the leading edges mounted on the shaft, and including rollers mounted to rotate on these shafts between the leading edges of the leading edges and matrix holders. 9. The rotary stamping device according to claim 1, characterized in that the engine control device increases the engine speed in the first predetermined position of the matrix holders and reduces the engine speed in the second predetermined position of the matrix holders and then increases the engine speed in the third predetermined position of the matrix holders and, respectively , reduces engine speed. 10. The rotary stamping device according to claim 1, characterized in that it is equipped with a support element that provides support for the first end of each rotor, while the second end of each rotor is not provided with a support element and two rotors are mounted for rotation in opposite directions with respect to each other to a friend to capture the sheet metal billet passing between them. 11. A method of stamping a thin sheet metal billet by passing it between two rotors, wherein each rotor is equipped with at least one die for stamping said thin sheet metal billet, characterized in that it has the stages of imparting rotation to said rotors in the opposite direction at a given first rotation speed ; increase the speed of rotation of the rotors at the first predetermined position; gradually reducing the rotation speed until reaching the second predetermined position; a gradual increase in the rotation speed until reaching the third predetermined position and a subsequent decrease in the rotation speed to the predetermined first rotation speed. 12. The method according to claim 11, characterized in that the first predetermined position is at a point immediately before the contact of the dies with sheet metal and the third predetermined position is at a point immediately after separating the dies from the sheet metal. 13. The method according to p. 11, characterized in that the dies are attached to the matrix holders and the matrix holders are mounted to rotate on the respective rotors, including the stage of giving direction to the matrix holders during rotation of the rotors, closing the stamps mounted on the matrix holders in planes parallel to each other in the first a predetermined position, and storing said dies in said parallel planes until the third predetermined position is reached.