MXPA96001530A

MXPA96001530A - Procedure for folding a t-shaped leaf into zig-zag

Info

Publication number: MXPA96001530A
Application number: MXPA/A/1996/001530A
Authority: MX
Inventors: Suess Philipp; Bar Martin; Stockli Xaver; Stockli Rainer
Original assignee: Sulzer Chemtech Ag
Priority date: 1995-04-25
Filing date: 1996-04-24
Publication date: 1997-12-01

Abstract

The present invention relates to a method for the zig-zag sheet of a strip-shaped sheet characterized in that it comprises the following steps: pre-pleat where a zig-zag or wavy folding is carried out, where the vertex or top lines of the fold have predetermined constant distances, subsequent modeling of the fold by means of at least one embossing tool where, along the upper lines, a fold edge with a radius of curvature predates each time

Description

PRGCED IM I ENTO FOR THE FOLDING IN Z1 -ZA PUT AN ILOJA EM SHAPE OF IT DESCRIPTION OF THE INVENTION The invention relates to a method for zig-zagging a sheet in the form of a strip, it also refers to the devices and arrangements for carrying out the process. Zig-zag pleated material strips, also called pleats, are used for the manufacture of packages, for example, for columns of material and heat exchangers. There are packages of this type that have additional structural characteristics, for example, interruptions arranged in a regular manner at predetermined places and for which a high accuracy of the pleating process is needed. Simultaneously, it should be possible to produce with a given procedure large quantities of pleated sheets at a convenient cost; With the currently known pleating methods, the necessary precision is not achievable. Laminating processes of good cost for the manufacture of pleated sheets are known, but, which in reference to the formation of the edges of the folds, are often insufficient, since, the radii of curve. The edges of the folds are too large. In addition, there is a "backward jump" in this procedure, of the material which, due to the lack of adequate control, leads to a product with a non-uniform shape. There is also known a stamped procedure wherein, the modeling is carried out with an oscillating stamping tool; also in this procedure, the precision is defective, it is added that these procedures have as an additional defect the production of a lot of noise. It is the task or object of the present invention to create a method and devices that allow the pleating of sheet strips at a good cost, and that they do so with the appropriate precision. This objective is achieved by the means and measures mentioned in the claims. In particular, the so-called pre-pleat, a wave-shaped fold, in which the vertex lines of the fold, have advances or guides of the edges of the edges, is manufactured in accordance with the present invention in a first step. fold, and these preformed edges, are formed in the cross section as arcs with a radius of curvature greater than about 1mm; then, the fold is formed by at least one embossing tool, when a fold edge with a pre-determined radius of curvature less than Imm is generated each time along the apex lines.

Advantageously, the subsequent modeling takes place in two partial stages, first, in each second fold edge and then in the remaining fold edges. It is also advantageous if, in a combined manner, the folding angle is influenced on the one hand by the stamping tool, and on the other hand the radius of curvature of the fold edge is reduced. Next, the invention will be described by means of the drawings. These show: FIG. 1 a schematic representation of an arrangement with which the method according to the invention is realizable; Figure 2 is a cross section through an oscillating stamping tool; Figure 3 a wobbly pressing device in side view that is provided for the subsequent or final modeling of a pleated sheet strip previously given; Figure a stamping tool with the eccentric drive of a wobbly pressing device; Fig. 5 a detail with respect to the stamping tool of Fig.; Figure 6 shows a first working phase of the staggering pressing device; and Figures another three working phases that follow 7a-c the phase of Fig. 5. With the apparatus or arrangement represented in Fig. 1, a strip of material 100, in the form of a sheet, can be continuously folded according to the method of the present invention. The folding edges of the pleating run inclined to the direction of travel of the strip 100. The arrangement has the following components: a pleating roller 10, which comprises a pair of rollers in the form of sprockets, which are arranged one above of the other, and of which only the superior is visible; a first wobbly or oscillating pressing device 1, with which the upper folding edges are subsequently modeled; a second wobbly pressing device 2, for the lower folding edges; an apparatus 3, which together with a connecting duct 3a, and a servo motor 30, arranged next to the device 2, form a regulating device. In the pair of rollers 10, a pre-pleating takes place, by means of which, the sheet strips 100, are formed in a corrugated strip 101. In the box a, the profile of the strip 101 is presented, in a somewhat exaggerated In the subsequent shaping in the device 1, a strip 102 is produced, with the profile indicated in the box or frame b, of the drawings, and correspondingly there is produced in the device 2, a strip 103, with the profile shown in the box or box c. In the installation 3, the height n, of the strip 103 is measured, in a logic switch this measured value is compared with a nominal value and a control signal is generated based on a deviation of the nominal value. With the servo tor 30, the second step of the subsequent shaping is influenced, the folding angle corrected in dependence on the control signal, when the distance between a toothed roller and a stamping tool is varied. device 2, of wobbly pressing. In the known pleating rolls or cylinders, the strip experiences an axial displacement as it is lowered in the pair of rollers; thus, with such a device impossible a continuous process, with a novel development pleat roll (compare the patent application filed simultaneously with this), that disadvantage can be eliminated, that new pleat roll is used in the The arrangement of Fig. 1 is characterized by the following properties: The teeth or gears of the two rollers consist of movable elements in the form of fillets, which are axially displaceable in grooves, and there are guiding means for the teeth of such. Thus, because of a forced guide of the teeth, the leaf strips are transportable on a fixed track. Instead of using a pleating roller, the pre-pleating can be carried out by pressing with an oscillating stamping tool. In FIG. 2, a cross section of such a tool is shown in cut-out form; with the double arrow 11, it is indicated that the upper part 10a performs an upward and downward oscillating movement while the lower part 10b has a counter mold fixed in space with respect to the part 10a. During the printing of the modeling with corrugations, the strip 100 is transported in the open state of a stamping tool, a wavelength, in the direction of travel, against the previous pleating with a pleating roller, is presented among other things the disadvantage that with the oscillating pressing tool, large traverses smaller in number can be achieved. Figs 3 to 7c, refer to the subsequent molding with the wobble pressing devices 1 and 2, the two devices 1,2, basically have the same construction, span each time, a rotatable toothed roller t a stamping tool 21, who makes a wobbly movement. In the device 1, the stamping tool 21 is disposed on the toothed roller 20, in the device 2, the placement is reversed, in Fig. 3, the device 2 is re-presented, which in comparison to the device 1 presents servomotor 30, as an additional component; the embossing tool 21, of Fig. fc, is shown in the orientation in which the device 1 is presented. In the wobbly pressing device of Fig. 3, the broken rotary toothed roller is indicated with a dotted line. 20, the tool 21 is impelled with an excise 22, which is joined by the pendulum axes 21 a, with each of the sliding bodies 215, which are guided vertically in a rail 215a. An eccentric shaft 220 is mounted rotatably on the supports 23, which are fixed on a bridge 2k, no drive device for the shaft 220 is shown.; between each two eccentrics 22, a compensating mass 229 is arranged. The bridges 2k can be adjusted by means of wedges 25a, (which move against fixed wedge 25b, and which are fixed in a base plate 5), with respect to the height. A variation of height in all cases, can be carried out with the servomotor 30, and a screw 31, in order to regulate the geometry of the fold, because of the possibility of varying the length of a tie bar 26, between the wedges 25a, with the threaded rods 260a, 260b, the horizontal direction of the bridges 2 can easily be adjusted. Fig. K shows details of the stamping tool 21, and of the eccentric 22, the stamping tool 21, is bar-shaped and has a groove for a stamping part 210, which moves in the groove; the groove is formed by two lath elements 212, which are themselves in a slot 210 ', and in this they are fixed laterally. A cut-off 211, in the form of a V, for the processing of the fold edges, at least one pressure spring 210, provided in the stamping tool 21, for example, a disk spring, has been provided in the printing part 210. it acts through a ram 217, on the stamping part 210, with rods 213, in the longitudinal holes 213a, the displaceability of the stamping part 210 is limited, at a previously chosen interval; the two edges 212a, 212b, of the element 212, running parallel to the groove 210 ', define together with the cut 211, V-shaped, of the embossing part 210, the geometry of the fold, that is, the radius of bending and folding angle. In both extremities, the stamping tool 21 presents the horizontal perforations 214 for a pendulum axis 214a; line V-V, in Fig. 4, indicates the position of a cut through perforation 214; this cut is shown in Fig. 5. The pendulum axis 214 is connected to a vertical sliding body 215, which can slide on a rail 215a; the central point 226 of the eccentric 22, (see Fig. 4), moves with the rotation of the shaft 220, on the eccentric circle 225, the stamping tool 21, is fixed to the connecting rod 221.

Between the rod 221, and the shaft 220, there is the bearing 222, arranged eccentrically with respect to the shaft. Figs. 6 and 7a-c. show the co-action of the stamping tool 21. and the toothed roller 20, in the subsequent or final modeling of the leaf strips 101, 110, previously pleated. The meaning of the figures given, to the parts of the stamping tool 21, are already known. In the toothed roller 20, the following co-ordination applies to the figures: roller bodies 200, teeth or gears 201, central line of the tooth 203, roller axis 203, and verticals 205, through the eie 203. The teeth or gears 201, are fixed in the grooves of the roller body 200; the angle between the central lines 201, measures, for example, 15. All the center lines 202 are cut on the axis of the roller 203; in Fig. 6, vertical 205 coincides with a central line 202. In the working phase of Fiq. 6. has just finished the stamping of a folding bend; the point 201 ', of the central tooth 201, is in the maximum grip with the cut or inlet 211, V-shaped, of the embossing part 210, the radius of curvature of the elaborate fold edges which is between the two stamped surfaces of the tip 201 ', or of the inlet 211, has been diminished by the stamping. Simultaneously, the corrugation angle corresponding to the inlet 211, as well as the tip 201 ', and also the two edges 212a, and 212b, have been formed. In the subsequent movement of the stamping tool 21 and the toothed roller 20, the distance between the tip 201 ', the tooth and the stamping tool 21 is again increased, the stamping part 210 is pushed by the pressure spring 216, from its groove around a short section against the toothed roller 20. This working phase is seen in Fig. 7a, in the following work phases I have Figs. 7b and 7c, a growing space is opened between the cut 211, and the tooth tip 201 '. In Fig. 7c, an oval curve 211a is represented, which is the trajectory of the cut 211, which occurs due to the wobble movement of eccentric 22, in that wobble movement it makes the central point 214b, of the pendulum axis 214a , or of the corresponding operation 214, a movement up and down, in the vertical 215b, which is collinear with the vertical 205. The toothed tip 201 ', moves on the circular line 201a, which cuts the oval 211a. in two points; between these cutting points -see the work phase in 1 * Fig. 6, the part of this step 211 is pressed, by the tooth 201, against the resistance of the spring 216, in the stamping tool 21. It is possible to With the pressing tool of the staggering Tensioning device or which we would call oscillating, although in an exact manner, only the fold edges have to be modeled later, then the two elements 212, in the form of strips, will not be necessary. have the stamping tool part 210, with cutting or V-shaped input.

Claims

NOVELTY OF THE INVENTION Having described the invention as above, the content of the following is claimed as property: CLAIMS 1.- Procedure for the zig-zag folding of a strip-shaped sheet characterized in that it comprises the following steps: previous pleating where a zig-zag, or wavy, foot is carried out, where the vertex or top lines of the fold have predetermined constant distances; further modeling of the fold by means of at least one stamping tool where, along the upper lines, a fold of pleat with a predetermined radius of curvature is produced each time. 2. Method according to claim 1, characterized in that, in the subsequent modeling, the folding angle is simultaneously influenced, where by means of the stamping tool, the formation of the fold edges and the fold angle are combined in a combined manner. swimming 3. Method according to claims 1, 2, characterized in that the modeling or subsequent formation takes place in two steps, wherein with a first stamping tool, each second fold edge is made and then with a second stamping tool. , the remaining fold edges are processed. 4. Method according to one of claims 1 to 3, characterized in that the subsequent modeling is carried out by means of a wobble press. 5. Method according to claims 1 to 4, characterized in that the pre-pleating is carried out with toothed rollers. 6. Procedure according to claims 1 to 5, characterized in that the pre-pleating is performed pressing with an oscillating stamping tool. 7. Method according to claims 1 to 6, characterized in that, the strip of sheets after the previous pleating is carried out is still transported with con. tfnua to and through the places where the inal training takes place. 8. Method according to claim 7, characterized in that, after the subsequent or final formation, a characteristic dimension is measured, especially the height of the strip being processed, this measure is compared with a nominal value and based on the deviation of the nominal value, the angle of folding in the subsequent or final conformation is corrected. 9. Method according to claims 8 and 3, characterized in that the correction of the folding angle takes place in a second step of the subsequent formation. 10. A wobble pressing device for carrying out the steps of the subsequent formation in a method according to claim 4, characterized in that it comprises a rotatable toothed roller and a stamping tool, wherein the stamping tool is driven by an eccentric and is linked by a pendulum axis with a vertically movable sliding body and wherein the stamping tool working in conjunction with a roller tooth can decrease the radius of curvature of a fold edge as well as influence the Corresponding fold angle. 11. Device according to claim 10, characterized in that the stamping tool has a groove for a bar-shaped stamping part, and in the stamping part there is provided a cut or entry in f? E of V, for the production of the fold edge and the embossing part is movable against the resistance of at least one pressure spring disposed in the embossing tool. 12. Device according to claim 10, characterized in that two edges parallel to the groove of the stamping part are arranged in the stamping tool, which together with the V-shaped cut of the stamping part serve for forming of the crease angle. 13. Device according to one of claims 10 to 12, characterized in that the eccentric spindle or support thereof are constructed displaceable in such a way that the distance between the toothed roller and the stamping tool can be varied. 14. Arrangement or apparatus for manufacturing a sheet strip in a zig-zag, with a method according to one of claims 1 to 9, wherein the devices arranged in series include: a toothed roller to perform a pleating previous; a first wobble pressing device according to one of claims 10 to 13, to subsequently form each second fold edge; and a second tamper-pressing device according to one of claims 10 to 13, for the subsequent or final formation of the remaining fold edges. 15. Arrangement or apparatus according to claim 14, characterized in that there is a regulation device for adjusting the fold angle, which comprises the following parts: following the second wobble pressing device, a measuring apparatus for determining the height of the folded strip; a logic switch for the generation of a control signal based on a measurement made in the measurement apparatus; and a servomotor disposed in the second wobble pressing device with which the distance between the toothed roller and the stamping tool is variable in dependence on the control signal.

SUMMARY OF THE INVENTION
A method for the zig-zac or plizado sheet of a strip-shaped sheet comprising in an advantageous embodiment the following steps is presented; 1.- Pre-pleat where a wave-shaped fold is made in which the fold edges are formed in the cross section as arcs, with a radius of curvature greater than about 1 mm; 2.- Subsequent shaping of each second fold edge where with a stamping tool with a part influences the fold angle and on the other hand the bend radius of the fold edge is reduced to a value less than 1mm;
3.- Subsequent shaping of the remaining edges of folds, in the same way as in the second step, the subsequent shaping steps are carried out with such a valiant or oscillating pressing device (1,2) which each comprise a roller rotating toothed (20) and a stamping tool (21), the stamping tool is driven by an eccentric 22 and is connected through a pendulum axis (214a) with a vertically movable sliding body. The stamping tool decreases in a joint action with a corresponding tooth (201) of the roller (20) the radius of corrugation of a fold edge and can further influence the corresponding fold angle. (Figures 1 and 6)