WO1994019126A1

WO1994019126A1 - Method of pressure intensifying drawing by rotary molding and apparatus therefor

Info

Publication number: WO1994019126A1
Application number: PCT/JP1993/000210
Authority: WO
Inventors: Haruma Tanaka
Original assignee: Sanshu Press Industry Co., Ltd.
Priority date: 1993-02-22
Filing date: 1993-02-22
Publication date: 1994-09-01

Abstract

A method of and an apparatus for molding a bottomed cylinder, the outer circumferential surface as a whole of which can be utilized effectively, out of a plate type raw material by plastic working. The method comprises the steps of holding a disc type raw material (1) between a workbench (2) and a pressure roll (3) so as to restrain the material in the direction of the thickness thereof, and pressing a circumferential portion (1a) of the disc type raw material (1) by a work roll (5) moving with respect to the circumferential surface of the pressure roll (3) with a desired clearance maintained between the work roll (5) and the pressure roll (3), so as to push out the circumferential portion (1a) into the clearance between the pressure roll (3) and work roll (5). The apparatus consists of a workbench (2) for supporting a disc type raw material (1), a pressure roll (3) for restraining the raw material (1), which is supported on the workbench (2), in the direction of the thickness thereof, and a work roll (5) adapted to be moved with respect to a circumferential portion (1a) of the raw material (1) with a desired clearance maintained between the work roll (5) and the pressure roll (3) and press the raw material (1) along the circumferential portion (1a) thereof so as to push out the circumferential portion (1a) of the raw material (1) into the clearance between the work roll (5) and the pressure roll (3).

Description

Specification

Intensification drawing method and apparatus by rotational molding

Technical field

The present invention relates to a method and an apparatus for forming a bottomed cylinder from a plate-like material by plastic working, and more particularly, to a method and an apparatus for forming a bottomed cylinder capable of effectively utilizing the entire outer peripheral surface.

Background art

In recent years, as a method of forming poly-V pulleys, timing pulleys, and the like, plastic working has been developed which can be formed at low cost instead of cutting.

When forming a poly-V bully or the like by the plastic working described above, first, a bottomed cylinder is formed by drawing from a plate-shaped member, and then a V-shaped part is formed by rolling at the circumferential rising portion of the bottomed cylinder. It is common to form grooves and tooth profiles.

However, when forming a sheet metal poly-V pulley or timing pulley by the above-mentioned plastic working, the width of the bully itself is wider than that of a pulley formed by cutting having the same effective driving surface. There is a problem. As a result, when these poly-V pulleys formed by conventional plastic working are used in the engine power transmission system of automobiles, where the design constraints of each part due to the reduction in size and weight are becoming severer. Thickness may become a problem and become unusable. Fig. 10 (a) is a cross-sectional view of a timing pool formed by cutting. FIG. 10 (b) is a cross-sectional view of a sheet metal timing pulley formed by plastic working. In the figure, HI indicates the width of the effective drive surface of these pulleys. From the drawing, it can be seen that the width of the sheet metal timing pulley formed by plastic deformation is wider by H2 than the width of the timing pool formed by cutting having an effective driving surface of the same width. The above-mentioned problem is caused by the process before V-rolling and tooth rolling. Fig. 11 (a) is a cross-sectional view of the material (hereinafter referred to as a bottomed cylinder) in the process before rolling the toothed profile of the timing pulley shown in Fig. 1 (b). The material 70 in FIG. 11 (a) (hereinafter referred to as a bottomed cylinder 70) is formed from a plate-like material by ordinary drawing. When a bottomed cylinder 70 is formed from a sheet material by drawing, the corner 73 between the outer peripheral surface 71 and the bottom plate 72 is always rounded, and the flatness of that portion is lost. This rounded corner 73 cannot be used as an effective drive surface, of course. Using this bottomed cylinder 70, a pool formed by machining that allows the entire outer peripheral surface to be used as an effective drive surface In order to obtain the same effective driving surface width as described above, it is necessary to increase the width H 3 of the bottomed cylinder 70 itself.

As a method of removing the roundness of the corner 73 caused by the above-mentioned drawing, there is a method of compressing the circumferential rising portion of the bottomed cylinder from above to make the corner a right angle. At first glance, the bottomed cylinder formed by this method had a force that seemed to solve the problem. There is a problem that a cut occurs. Fig. 11 (b shows a cross-sectional view of a cylinder with a bottom formed by this method. In the figure, 80 is a cylinder body with a bottom, 81 is a circumferential rising part, 82 is an inner corner, 83 is a corner, and 84 is a corner. The bottom plate and 85 each indicate a slit, and as is clear from the drawing, a slit 85 is formed at the corner 83. Thus, the slit 85 is formed at the corner 83. The bottomed cylinder 80 has a low strength at the portion where the slit 85 is formed, and also causes problems such as foreign matter entering the slit 85 and causing 鲭. It cannot be used as a material.

The problem with the bottomed cylinder formed by the above-mentioned drawing process is that when this bottomed cylinder is used as a material for sheet metal timing pulleys and sheet metal poly-V pulleys, of course, for other purposes The same can be said when using for

Disclosure of the invention

An object of the present invention is to provide a method and an apparatus for forming a bottomed cylinder capable of effectively utilizing the entire outer peripheral surface in view of the problems caused by the conventional drawing described above.

In order to achieve the above-mentioned object, the present invention provides a method for reducing pressure by pressurizing, comprising: holding a disk-shaped material on a worktable; and providing a holding roll inside the outer periphery of the disk-shaped material. Restrict the thickness of the plate-shaped material and move it with respect to the peripheral surface of the presser roll while maintaining the desired gap between the plate and the presser roll. Forming a cylindrical member with a bottom by pressing the material along the peripheral edge of the material with a processing roll, and extruding the peripheral edge of the disc-shaped material into the gap between the holding roll and the processing roll. Is what you do.

Further, in order to achieve the above-mentioned object, a pressure-intensifying drawing apparatus of the present invention is provided with a work table for holding a disc-shaped material, and a work table arranged inside the outer periphery of the disc-shaped material. While maintaining a desired gap between the presser roll and the presser that restrains the thickness of the held disc-shaped material, the presser roll is moved with respect to the periphery of the presser roll, and the disc-like material is removed from the presser roll. It consists of a processing roll that presses along the peripheral edge, and the peripheral edge of the disc-shaped material is pressed by the processing roll to push the peripheral edge of the material into the gap between the presser roller and the processing roll. The present invention is characterized in that a bottomed cylindrical member is formed.

According to the method and the apparatus of the present invention as described above, the disc-shaped material is held on the work table, and the thickness of the disc-shaped material is restrained by the presser roll. While maintaining the gap between the roller and the processing roll, the peripheral edge of the disc-shaped material is pressed so as to be pushed into the gap. At this time, since a high pressure is applied to the peripheral portion (that is, the portion being processed) of the material pressed by the processing roll, the material is not broken by a deformation such as a crack.

In addition, the shape of the processing roll, the shape of the A cylinder with a bottom that has a circumferential rising portion that is thicker than the bottom plate, simply by changing the gap between the processing roll and the presser roll by changing the gap between the erol and the presser roll as appropriate. However, various types of bottomed cylinders can be easily formed.

BRIEF DESCRIPTION OF THE FIGURES

FIGS. 1 (a), (b), and (c) are schematic process diagrams showing one embodiment of a process of forming a bottomed cylinder with an apparatus using the method of the present invention.

FIG. 2 is a schematic perspective view of the intermediate stroke of the principle diagram shown in FIG.

FIG. 3 (a) is a perspective view of a bottomed cylinder formed by the process shown in FIG.

FIG. 3 (b) is a sectional view taken along line AA of (a).

Figs. 4 (a) and (b) show an embodiment of a process using the method of the present invention, which forms a bottomed cylinder as a material when forming a poly-V pulley by rolling. It is a schematic process diagram. Fig. 5 is a cross-sectional view of the bottomed cylinder formed in the process shown in Fig. 4 cut in a diametrical direction. Fig. 6 (a) is a rolling process from the bottomed cylinder of Fig. 5 by rolling. FIG. 5 is a cross-sectional view of a formed completed poly V-puri cut in a diameter direction.

Fig. 6 (b) is a cross-sectional view of a poly-V pulley formed by rolling from a bottomed cylinder formed by conventional drawing and cut in the diameter direction. FIG. 7 is a schematic configuration diagram showing a configuration of a main part of an apparatus using the method of the present invention.

FIG. 8 is a schematic view of the vicinity of the wrinkle holding roll and the guide roll in FIG. 7 viewed from the punch direction.

FIGS. 9 (a) and 9 (b) are both cross-sectional views showing another embodiment of a bottomed cylinder which can be formed by the method of the present invention. FIG. It is sectional drawing which cut | disconnected the timing pulley in the diameter direction.

FIG. 10 (b) is a cross-sectional view of the evening pulley formed by conventional plastic working, which is cut in the diameter direction. Fig. 11 (a) is a cross-sectional view of the raw material (cylinder with bottom) of the process shown in Fig. 10 (b) in the process before rolling the tooth profile, which is shown in Fig. 10 (b). It is.

Fig. 11 (b) is a cross-sectional view of the bottomed cylinder of Fig. 10 (a) obtained by compressing the rising portion of the circumference of the bottomed cylinder from above and cutting the bottomed cylinder with the right angle at the corners in a diameter direction. is there.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a pressure-intensifying drawing method and apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 shows a principle diagram of the method of the present invention, and FIG. 2 shows a schematic perspective view of an intermediate process of the principle diagram shown in FIG. 1. The disc material 1 is sandwiched between the worktable 2 which can rotate and the presser roll 3. At this time, the mandrel 4 is inserted into the center hole of the material 1 so that the material 1 is held at this position. Presser roll 3 Using a cylinder with a diameter smaller than the inner diameter of the workpiece 20 (see Fig. 1 (c)) after the completion of drawing of material 1 and displacing the center from the center of material 1, the outer diameter of roll 3 Arrange so that it is close to the outer diameter of 1. A step 6 is provided above the cylindrical processing port 5, thereby forming a gap 7 having a predetermined shape between the processing roll 5 and the presser roll 3. The distance between the processing roll 5 and the press roll 3, that is, the width of the gap 7 is set so that the peripheral edge la is not bent when the peripheral edge la of the disk material is pressed inward from the outside. It is preferable that the width is about 1.5 times the thickness of the disc material 1. While rotating the worktable 2, the presser roll 3, and the processing roll 5 that rotate, the work roll 5 is moved toward the center of the worktable 2 (the direction of the arrow X in FIG. 2). As a result, the presser roll 3 is also pushed by the processing roll 5 and moves toward the center of the work table 2 while maintaining the gap with the processing roll 5, that is, while maintaining the shape of the gap 7. At this time, the work 1 rotates together with the worktable 2, and the peripheral edge la of the work 1 is pressed by the processing hole 5 from the outside toward the center. Material 1 is constrained by mandrel 4 at its position and its thickness is restricted by work table 2 and presser roll 3, so the pressed peripheral edge la of material 1 is the only clearance It is extruded while being deformed to 7. (At this time, the vicinity of the portion of the peripheral edge ia of the disc material 1 that is in contact with the processing roll 5 is pressed with high pressure. When the material is deformed under high pressure, it does not break down due to deformation, so the peripheral edge la also deforms without breaking down due to deformation.

Through the process shown in FIG. 1 (b), as shown in FIG. 1 (c), the work roll 4 is moved until the presser roll 3 comes to a position where its center and the center of the disc material 1 are aligned. The peripheral part la of the disc material 1 is pressed and moved while being deformed, and the peripheral part la of the disc material 1 is started up one after another. Then, as shown in Fig. 1 (c), when the center of the presser D-rule 3 coincides with the center of the disk material 1, the disk material 1 has a bottomed cylinder whose inner diameter is equal to the outer shape of the presser roll 3. Processed into 20.

FIG. 3 (a) is a perspective view of the bottomed cylinder 20 formed according to the principle of FIG. 1, and FIG. 3 (b) is a sectional view taken along the line AA in FIG. 3 (a). In the figure, reference numeral 21 denotes a peripheral edge la of the disc material 1 which is vertically deformed by the processing roll 5 (hereinafter, the deformed peripheral edge is referred to as a circumferential rising portion in the present embodiment). As is apparent from the drawing, the inner corner 23 located between the bottom plate 22 and the circumferential rising portion 21 of the bottomed cylinder 20 formed according to this principle has the conventional shape shown in FIG. 11 (b). A slit 85 such as a bottomed cylinder 80 does not occur. Further, since the outer corner portion 24 of the bottomed cylinder 20 formed according to this principle is not rounded and is a right angle, the entire outer peripheral surface 25 can be effectively used. Therefore, when a timing pulley is formed from this bottomed cylinder 20 by rolling, as shown in FIG. It has the same shape as the imaging pool, and the entire width H1 can be used as an effective drive surface. Next, an embodiment of an apparatus for forming a bottomed cylinder as a raw material of a poly-V pulley by using the method of the present invention will be described. Fig. 4 (a) shows the state before the start of machining, and Fig. 4 (b) shows the state after the end of machining. In the drawing, a material 31 is a disk, and a worktable 32, a presser roll 33, a mandrel 34, and the like have the same functions as those of the embodiment shown in FIG. The heating roll 35 also performs the same function as the processing port 5 shown in FIG. 1, but the shape of the pressing surface 38 pressing the material 31 is different from that of FIG. That is, the processing hole 35 is provided with a step portion 39 that is recessed inward below the pressing surface 38. With this device, when the peripheral portion 31a of the disc material 31 having a hole at the center is pressed toward the center of the material 31 by the processing roll 35, the peripheral portion 31a of the material 31 is pressed in the embodiment shown in FIG. In the same manner as in the above, it is extruded into a gap 37 formed between the processing roll 35 and the presser roll 33 to form a circumferential rising portion 41 conforming to the shape of the gap 37.

FIG. 5 is a cross-sectional view of the bottomed cylinder 40 that is used as a material when forming a poly-V pulley by the rolling process formed by the method of FIG. In the figure, reference numeral 41 denotes a circumferential rising portion, reference numeral 42 denotes a bottom plate, and reference numeral 43 denotes an outer peripheral surface. As shown in the drawing, a lower portion of the outer peripheral surface 43 of the bottomed cylinder 40 is shown in FIG. A flange that projects radially outward from the outer peripheral surface 43 corresponding to the step 39 provided on the pressing surface 38 of the work roll 35 A part 44 is formed.

FIG. 6 (a) is a cross-sectional view of a completed poly V pulley 50 formed by rolling from the bottomed cylinder 40, and FIG. 6 (b) is a cross-sectional view of a conventional drawing process. The cross-sectional views of the completed poly V pulley 50 'formed by rolling from a bottomed cylinder are shown. As a method of forming the poly V bully 50 by rolling from the bottomed cylinder 40, there is a method described in Japanese Patent Application Laid-Open No. 60-188657, which is a conventionally known method. The explanation is omitted.

As shown in the drawing, the bottomed cylinder 40 formed by the method of the present invention has a flanged portion 44 at the bottom of the cylinder which becomes the lower flanged portion 51 of the completed poly V-puri 50 after rolling. Formed on the same plane as the plate 42 and the circumferential rising portion 4i is thicker than the bottom plate 42. Also, the step of increasing the thickness of the circumferential rising portion can be omitted.

The Poly-V pulley 50 formed by rolling from this bottomed cylinder 40 is compared with the Poly-Puri 50 'manufactured by conventional plastic processing shown in Fig. 6 (b). Therefore, the width of the portion other than the effective drive surface, that is, the portion occupied by the lower flange 51 is reduced. In FIG. 6, 51 'indicates a lower flange, and 52 and 52' indicate upper flanges.

Next, an apparatus for forming another bottomed cylinder 60 to be used as a raw material before rolling a poly-V pulley using the method of the present invention. An embodiment will be described.

FIG. 7 is a schematic side view showing a configuration of a main part of the molding apparatus, and shows a state where molding of the bottomed cylinder 60 has been completed. In the figure, reference numeral 60 denotes a bottomed cylinder formed from a disc material 60 ′. The bottomed cylinder 60 is pressed by a die 61 and a punch 62, and the center thereof is raised to a dish shape. The die 61 is configured to be rotatable about a mandrel 63, and the mandrel 63 is inserted into the punch 62 through the center of the disk material 60 ′. The punch 62 presses the disc material 60 ′ against the die 61 with a considerably high pressure, and is rotatably fixed to a fixed base (not shown) so as to be able to rotate together with the die 61. Four wrinkle holding rolls 64 made of a disc material 60 ′ are arranged around the bunch 62 at intervals of 9 °. (This is not shown in the figure.) <The wrinkle holding roll 64 is rotatably fixed to the shaft by a part 66 of the fixed base described above, and a guide hole 65 is provided at an upper portion thereof. Therefore, when the die 61 and the disc material 60 ′ rotate, the wrinkle holding roll 64 and the guide roll 65 rotate in opposite directions, and do not rotate and move on the spot, (see FIG. 8, wrinkles in FIG. 8). This is a schematic view of one of the presser roll 64 and the guide roll 65 as seen from the punch 62 side.) One of the four wrinkle holding rolls 64 ′ described above slides along with the guide roll 65 ′ disposed on the top thereof, in the plane direction of the disk material 60 ′, that is, in the direction of arrow X in FIG. It is configured so that Further, a processing D-roll 67 is provided radially outward of the slidable wrinkle-holding roll 64 ′ at an appropriate interval from the pressing-down hole 64 ′. The processing roll 67 is configured to be able to move in the diameter direction of the disk material 60 ′ while maintaining a gap between the processing roll 67 and the pressing roll 64 ′. The processing roll 67 is configured to be rotatable about a shaft 68, and the guide roll 65 'is provided so as to prevent the processing roll 67 from floating from the die 61 due to the pressure of the material 60' during processing. It is pressed by an auxiliary roll 69 provided rotatably on the same.

To explain the operation of the device configured as described above, first, a disc material 60 ′ having a hole in the center is set on a die 61 such that a mandrel 63 penetrates the hole. It is held by two wrinkle holding rolls 64, and the center is pressed by a punch 62 into a plate shape. At that time, the mandrel 63 of the die 61 is inserted into a hole (not shown) formed in the center of the punch 62, and the punch 62 remains in the disc material 60 'even after pressing. _C is kept pressed against the die 6 with high pressure.c Then, of the wrinkle holding rolls 64, the slidable wrinkle holding roll 64 ′ is slid to the peripheral edge 60 a of the disc material 60 ′. Move from the vicinity to the center of the material 60 'in detail, to a position on the same circumference as the remaining three wrinkle holding π-rules 64. With the movement of the wrinkle holding roll 64 ′, the wrinkle holding roll 64 ′ and the wrinkle holding roll 64 ′ move together. While maintaining the distance of 加, a thermometer 67 configured to slide toward the center of the disc material 60 ′ while rotating about 铀 68 moves toward the center of the disc material 60 ′. . When the processing roll 67 moves, the outer peripheral surface 60a 'of the disc material 60' is pressed toward the center on the outer peripheral surface (no reference numeral) of the processing roll 67, and the pressed peripheral portion 60a is pressed. It is extruded into the gap between the 'wrinkle holding roll 64' and the processing roll 67 (no reference numeral) to form a circumferential rising portion 60a.

The bottomed cylinder described in each of the embodiments described above is merely an example of a cylinder that can be formed by the low-pressure drawing method of the present invention. Of course, it can be achieved simply by appropriately changing the shape of the gap between the processing roll and the presser hole according to the purpose. As an example, FIGS. 9 (a) and 9 (b) show examples of a bottomed cylinder of another shape which can be formed by the method of the present invention.

Further, the pressure-intensifying drawing method and apparatus of the present invention are not limited to the illustrated embodiment.For example, the presser roll is configured so that its diameter can be changed in a stepwise manner and fixed at the center position of the material. A method and an apparatus may be used in which, when the peripheral edge of the material is pressed in the diameter direction of the material by the processing roll, the diameter of the pressing roll is changed stepwise so that the circumferential rising portion is formed stepwise.

Industrial applicability As described above, according to the low-pressure drawing method of the present embodiment, a pressing roll is provided inside the outer periphery of the disc-shaped material to restrict the thickness of the disc-shaped material, and the periphery of the disc-shaped material is Is pressed along the peripheral portion by a processing roll, and the pressed portion of the peripheral portion is pressed into a gap between the processing roll and the press roll to form a bottomed cylinder, so that the entire outer peripheral surface is effectively used. Can be formed without using large equipment such as press working, and as a result, the material before forming the Puri V pulley, timing pulley, etc. It is possible to provide a very useful method for forming a bottomed cylinder.

Therefore, if the cylinder with the bottom formed by the intensifying drawing method of the present embodiment is used as the material, the cylinder having the same effective driving surface as the one formed by the cutting process and the one formed by the cutting process A timing pulley V-puri with the same width as that of can be formed by rolling, which is a plastic working that is less costly than cutting.

Further, according to the pressure-intensifying drawing apparatus of the present invention, a press roll for maintaining the thickness of the disc-shaped material is disposed inside the outer periphery of the disc-shaped material, and a desired space is provided between the press roll and the press roll. A processing roll that can be moved while maintaining it is provided, and the peripheral edge of the disc-shaped material is pressed by the processing roll, and the peripheral edge of the material is pressed into the gap between the processing roll and the presser roll to form a bottomed cylinder The configuration of the pressing surface of the processing roll, Various bottomed cylinders can be formed simply by appropriately changing the distance from the work roll, that is, the width of the gap between the processing roll and the presser roll. Also, by simply changing the moving distance of the processing roll, bottomed cylinders having different diameters can be easily formed.

Forming a poly-V pulley or the like by rolling from a bottomed cylinder formed by the method and apparatus for intensifying drawing according to the present invention makes it possible to obtain a thin poly-V bully or the like that has been realized only by conventional cutting and the like. It can be formed, and as a result, it becomes possible to form a poly-V pulley or the like that can be applied to automobiles and the like that are becoming lighter and smaller by plastic working.

Claims

The scope of the claims

1. Holding the disc-shaped material on a workbench, providing a press roll inside the outer periphery of the disc-shaped material, restraining the thickness of the disc-shaped material, The material is pressed along the peripheral edge of the material with a processing roll that moves against the peripheral surface of the presser roll while maintaining the gap, and the peripheral edge of the disc-shaped material is placed between the presser roll and the processing roll. A pressure drawing method in which a cylindrical member with a bottom is formed by extrusion.

2. The method according to claim 1, wherein the worktable rotates, and the presser roll and the processing roll move along the radial direction of the disc-shaped material.

3. A worktable that holds the disc-shaped material, a press roll that is disposed inside the outer periphery of the disc-shaped material, and that restrains the thickness of the disc-shaped material held on the worktable, A work roll that moves against the periphery of the presser roll while maintaining a desired gap between the work roll and the disc, and presses the disc-shaped material along the periphery of the material. A pressure-drawing device characterized in that a cylindrical member with a bottom is formed by pressing a peripheral portion of a plate-shaped material and extruding the peripheral portion of the material into a gap between a presser roll and a processing roll. .

4. The augment according to claim 3, wherein the worktable is configured to be rotatable, and the presser roll and the processing roll are configured to move in a radial direction of the disk-shaped material. Compression device