KR950009778Y1 - Forming apparatus of mult spiral tube - Google Patents

Abstract

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Description

Multi-layer Spiral Tube Forming Equipment

1 is a side view of the arrangement of the forming roll and the guide roll

2 is a front view of the casting roll

3 is a front view of the auxiliary forming roll and the guide roll

4 is an enlarged view of a gap formed between the main forming roll and the auxiliary forming roll.

5 is an explanatory diagram showing the process of the initial transfer when the main molding roll is rolled one round and the tip of the molded sheet is transferred one pitch in the advancing direction, and each roll is arranged side by side for convenience of explanation.

6 is a partial cutaway front view of a multi-layer spiral tube obtained in this paper.

7 is an illustration of a multi-layer spiral tube in which the pitch of some sections is reduced through post processing.

8 is a schematic cross-sectional view of part A of FIG. 7

9 is a schematic cross-sectional view of a conventional multilayer spiral tube corresponding to FIG.

* Explanation of symbols for main parts of the drawings

10: casting roll 11a-n21a-n, 31a-n: acid

12a-n, 22a-n, 32a-n: Goal 13,23,33: Axis

20: auxiliary forming roll 30: guide roll

40: material 41: waveform plate

42: tip 50: multilayer spiral tube

51: first floor spiral tube 52: second floor spiral tube

53: spiral spiral tube 54: fourth spiral spiral tube

P: pitch S: gap

The present invention relates to a molding apparatus for a multilayer spiral tube used for an exhaust pipe of an automobile engine, and more particularly, to a multilayer spiral tube molding apparatus capable of continuously and efficiently forming a multilayer spiral tube having high flexibility and high compressive strength.

As a multilayer spiral tube to be referred to in the present invention, there is a Utility Model Publication No. 92-21842. This prior art is formed by overlapping a thin strip metal plate in three layers to have a cross-sectional structure of a three-layer spiral tube. Axial and radial displacements are possible. The multi-layer spiral tube according to the prior art has a uniform pitch as illustrated in FIG. 9 and a portion where the bent portion of each peak and valley is equal to or less than 180 degrees, so that displacement in the axial direction and the radial direction is required. For example, the flexibility in the intermediate portion of the portion connected to the output end of the engine-side communication tube and the portion connected to the tip of the muffler-side communication tube was lower than expected. For this reason, the conventional multi-layer spiral tube has insufficient effect of absorbing and blocking noise generated during operation and noise generated when exhaust gas passes when it is applied to a vehicle engine exhaust pipe having a high vibration. In addition, the cross-sectional structure of the three-ply multi-layer spiral tube is low in strength, for example, where a larger displacement is required in the axial direction and the radial direction, which is likely to cause problems in future durability. therefore. The purpose of this paper is to provide a multi-layer spiral tube forming apparatus capable of efficiently forming a multi-layer spiral tube that can tolerate harsh vibrations and noises by increasing the flexibility and strength to increase the displacement width in the axial and radial directions. It is. In order to achieve the above object, the present invention is a guide roll for determining the radius of the multi-layer spiral tube while guiding the primary forming roll, the auxiliary forming roll corresponding thereto, and the primary bending material passing through these forming rolls in the bending direction. Provided is a configured multi-layer spiral tube forming apparatus. Here, the main forming roll is the driving side and the auxiliary forming roll is the driven side, the guide roll is an idle roll that is rotated in place by the movement of the material passing while bending to the spiral tube. The main forming roll, the auxiliary forming roll, and the guide roll are the same aspects in which discs similar to the abacus eggs are inserted and fixed at equal intervals (pitch) on one axis, respectively.

However, the main forming rolls have a larger end diameter and a constant thickness than the auxiliary forming rolls and guide rolls. The thickness and valley diameter of the mountain are gradually decreasing. In other words, the auxiliary molding roll and the guide roll have a tapered shaft with a tip diameter larger than that of the distal end, and the width of the bone gradually increases from the tip of the shaft to the tip, and the depth of the bone is cut according to the taper of the shaft. will be. Here, the reduction of the peak thickness of the auxiliary molding roll and the guide roll is such that the diameter of the bone is expanded, and the gradual reduction of the tip thickness and the valley diameter of the peak is 1 to 2, 3, 4, etc. for each pitch. As the number of overlap increases, it gets bigger. This ensures that the peaks and valleys of the layered spiral tube, which is thicker as the pitch is repeated, can pass between the main forming roll and the auxiliary forming roll without difficulty. The radius of the multi-layer spiral tube to be formed can be formed to a dimension larger than the dimension of the peak and roll radius of the main molding roll plus the thickness of the multilayer molding tube (height from the outer end of the peak to the inner end of the valley). The auxiliary molding roll is fixedly placed, while the guide roll is installed in a variable manner. By arranging the guide rolls, the multi-layer spiral tube can be changed in radius as described above, and the change in the radius of the multi-layer spiral tube can be freely changed by adjusting the placement angle and perspective of the guide rolls for the main forming roll and the auxiliary forming roll. Can be. That is, the closer the guide roll is to the main forming roll and the farther away from the auxiliary forming roll, the smaller the diameter of the multi-layer spiral tube becomes, and the closer the guide roll to the auxiliary forming roll, the larger the diameter of the multi-layer spiral tube. In this way, multi-layered spiral pipes are continuously formed by using three non-spiral rolls. When a long strip of steel sheet is inserted in a direction perpendicular to the axial direction of the main forming rolls and the auxiliary forming rolls installed in parallel, the rolls are formed first. The distal end of the corrugated plate is bent into a corrugated plate corresponding to approximately half of the gap left between the main forming roll and the auxiliary forming roll in multiple stages, and the distal end of the corrugated plate is pushed out by the subsequent input pressure of the material. Guided rolls are guided around the main roll. If the tip end of the bending material is left as it is, it will be inserted between the main molding roll and the auxiliary molding roll again and become a multi-layer wave tube. It is artificially conveyed by one pitch just before being re-injected to pass between the main forming roll and the auxiliary forming roll, and from then on, it is formed into a multilayer spiral tube by itself without having to use it again. This one-pitch movement operation of the corrugated plate is possible because the inner diameter of the first bent spiral tube is larger than the outer diameter of the main molding roll, and there is a space allowance between the front end of the material and one pitch.

Hereinafter, the description will be made in more detail according to the accompanying drawings prepared by the preferred embodiments of the present invention. In FIG. 1, the upper part is the main molding roll 10, and the one immediately below the main molding roll 10 is the auxiliary molding roll 20, and both the main molding roll 10 and the auxiliary molding roll 20 are shown. Located in the rear of the guide roll to guide the roll forming the corrugated plate 41 is formed into a corrugated plate 41 to pass through between the main forming roll 10 and the auxiliary forming roll 20 to form a corrugated plate 41 (30). The main molding roll 10, the auxiliary molding roll 20, and the guide roll 30 arrange the center of the axis in the triangular direction. The main forming roll 10 is used as the driving side, the auxiliary forming roll 20 is driven, and the guide roll 30 is pushed in place due to the force passed by the corrugated plate 4l. Install so that it can rotate in the direction of induction. And the main forming roll (10) and the auxiliary forming roll 20, the acid (1la-n) and (21a-n) are alternately arranged, the guide roll 30 is the acid (31a-n) the auxiliary forming roll It is disposed in parallel with the mountain (21a-n) of (20), the main forming roll 10 and the auxiliary forming roll 20 is installed in a stationary manner to rotate in place and the guide roll 30 is positioned up and down, left and right Install to make the change work. 2 and 3, the main molding roll 10, the auxiliary molding roll 20 and the guide roll 30 are viewed from the front. In these figures, the main forming roll 10, the auxiliary forming roll 20, and the guide roll 30 have a shape in which a plurality of rounded discs are inserted and fixed at the same pitch P on the axes 13.23 and 33, respectively. to be. However, the main forming roll 10 has a larger diameter and constant thickness of the peaks 11a-n than the auxiliary forming rolls 20 and the guide rolls 30, and the diameter and width of the valleys 12a-n are the same. However, the auxiliary forming rolls 20 and the guide rolls 30 have the diameters of the peaks 21a-n and 31a-n and the diameters of the valleys 22a-n and 32a-n as compared with the main forming rolls 10. The thickness of the peaks 21a-n and 31a-n and the diameters of the valleys 22a-n and 32a-n are gradually smaller from the tip portion F to the distal end portion E. This difference becomes more pronounced toward the distal end (E). This is a necessary condition in order to secure a sufficient space that can be accommodated in steps in which the number of overlaps of the corrugated plate 41 increases each time the pitch is shifted by one pitch. In other words, the auxiliary forming rolls 20 and the guide rolls 30 are tapered shafts 23 and 33 whose tip diameters are larger than the ends, and the tip portion F having a larger diameter in accordance with the taper in these shafts 23.33. ) From the thick side (21a.31a) to the smallest and thinnest mountain (21n, 31n) from the side toward the small diameter end (E). The widths and depths of the valleys 22a-n.32a-n of the auxiliary forming rolls 20 and the guide rolls 30 are determined on their own as the hills 21a-n and 31a-n are formed under the above conditions. . That is, the thickness reduction of the hills 21a-n.31a-n of the auxiliary forming roll 20 and the guide roll 30 is directly connected to the width extension of the valleys 22a-n.32a-n. 4 is a state in which the main forming roll 10 and the auxiliary forming roll 20 having the above requirements are alternately installed, but arranged so that a predetermined multi-stage gap S remains between them. As shown in this figure, the gap (S) gradually widens from the leading end (F) to the distal end (E). That is, if the thickness of the material 40 is t, the gap of the first pitch P1 is S = T, the second pitch P2 is S + 2t, the third pitch P3 is S + 3t, ... and S + nt at the last pitch (Pn). In this manner, as the pitch numbers of the main molding roll 10 and the auxiliary molding roll 20 are repeated, the gap S gradually increases by 1t. As mentioned before, the main forming roll 10 and the auxiliary forming roll 20 are formed so that they can be periodically overlapped with one pitch behind as the spiral tube is formed even after the material 40 is bent into the corrugated plate 41. It is meaningful to provide a space through which the thickness of the spiral tube increased by the number of overlaps therebetween.

5 is a view of the thin long strip steel sheet material 40 having a width that can be bent in a wave at a time by the acid (21a-n, 31a-n) given to the main forming roll 10 and the auxiliary forming roll 20. Before the tip part 42 enters between the main forming roll 10 and the auxiliary forming roll 20 again, the tip part 42 is artificially moved one pitch to enter between the main forming roll 10 and the auxiliary forming roll 20. It shows the operation.

It is molded into the first spiral tube, i.e., the innermost first layer spiral tube 51, from being re-injected while being conveyed by one pitch. If the material is left in this state and the material is continuously pushed in, the second layer spiral tube is surrounded by the first layer spiral tube 51, and the third layer is thereafter on the second layer. It is molded into a multilayer spiral tube 50 in which n layers are stacked on the outer surface of one layer. This phenomenon is initially caused by the corrugated plate 41 passing between the main forming roll 10 and the auxiliary forming roll 20 in contact with the guide roll 30, but with the main forming roll 10 with one pitch movement. From the first layer spiral pipe 51 passing through the gap of the next step of the auxiliary forming roll 20, it is possible that the spiral is continuously guided by the guide roll 30. The bending to the corrugated plate 41 and the transfer between the pitches in the axial direction are continued while the second-layer spiral tube 52 is rolled one pitch behind the first-layer spiral tube 51 and then pitched again one pitch. Conveyed, and then the outer layer of the second-layer spiral tube 52 is rolled in a state in which the third-layer spiral tube 53 is pitched one pitch behind, and then another pitch is conveyed, and the third-layer spiral tube 53 is 1 It is rolled in a pitch-delayed state and conveyed one pitch again, and the outer layer of the third-layer spiral tube 53 is rolled in a state in which the fourth-layer spiral tube 54 is rolled one pitch behind. On the drawing of the example, 4 ply) is formed by the overlapping multi-spiral tube 50. The inner diameter of the multi-layer spiral tube 50 to be formed is the radius of the main molding roll 10 having the largest radius plus the thickness of the multi-layer molding tube 50 to be formed (the cross-sectional height from the outer end of the hill to the inner end of the valley). Molding is possible only with dimensions larger than the dimensions. Standard products below that cannot be obtained. This is because the corrugated plate 41 is attached to the outer circumferential surface of the main forming roll 10 so that there is no space left for artificially moving the tip portion 42 of the corrugated plate 41 by one pitch. In this manner, the multi-layer spiral tube 50 is formed, and the inner diameter of the multi-layer spiral tube 50 may be changed according to the perspective of the guide roll 30 with respect to the main forming roll 10 and the auxiliary forming roll 10. . That is, the inner diameter of the multi-layer spiral tube 50 decreases as the guide roll 30 is located closer to the main molding roll 10 and farther away from the auxiliary molding roll 20, whereas the guide roll 30 assists the guide roll 30. The inner diameter of the multi-layer spiral tube 50 becomes large while approaching the forming roll 20 and away from the main forming roll 10.

The multi-spiral tube 50 obtained by completely passing the main forming roll 10 and the auxiliary forming roll 20 is cut to the required length to change the pitch of a portion thereof, for example, for use in an automobile engine exhaust pipe. When pressure is applied simultaneously in the direction of the arrow in both axial directions by using a compression mechanism on the boundary between the connection part (a) of the multi-layered spiral pipe and the non-connection part (c) existing between the connection part (b), the connection part (a, b) The pitch of the non-connected portion (C) is smaller than that of the pitch, so that the multilayer spiral tube 500 can be deformed. The peak and valley cross-sections of the multi-layer spiral tube 500 in which the pitch is changed in this way have a bending angle of more than a flat angle with a bending angle θ much larger than that of the conventional multi-layer spiral tube illustrated in FIG. 9 as illustrated in FIG. do. Therefore, although the pitch of the non-connection portion is shorter than the original one, which is the same as the pitch of the connection portion, the bending angle of the peak and the valley is large, so that the elasticity in the axial direction is relatively larger in the radial direction as well as the restoring force after the displacement. In addition, the inner side of the mountain concave into the inner side of the resonance chamber (d) is more resonant action is more active than the existing multi-layer spiral tube energy reduction effect of the engine noise passing through it. The molding apparatus can also form a multi-layer spiral tube of four or more layers of thin plates.

As described above, this paper allows the continuous molding of multi-layer spiral tubes with three non-helical rolls, such as the main forming roll, the auxiliary forming roll, and the guide roll, so as to spirally form the main forming roll and the auxiliary forming roll. It is much easier to manufacture than ever before, and the multilayer spiral tube can be molded more efficiently.

Claims (1)

(Correction) A device for forming a multi-layer spiral tube by rounding a thin and long band metal sheet material in multiple layers, wherein the main forming roll 10, the auxiliary forming roll 20, and the guide roll 30 are non-spiral and have the same pitch. The main molding roll 10 has the same thickness and diameter of the peaks 11a-n, and the valleys 12a-n have the same width and the diameter of the valleys. The thickness of 21a-n) and its diameter and the diameter of the valleys 22a-n are gradually reduced in inverse proportion to the overlapping number of the spiral pipes along the conveying direction of the spiral pipes. 20 is formed in the same shape, and the gap (S) formed between the acid (11a-n, 21a-n) and the valleys (12a-n, 22a-n) of the main molding roll 10 and the auxiliary molding roll 20 ) Is gradually widened as the number of overlaps of the corrugated pipe 41 increases from the front pitch to the subsequent pitch, and can change the inner diameter of the multi-layer spiral tube 50 according to the position and position of the guide roll 30.A multi-layer spiral tube-forming device, characterized in that soundness