Punching machine and container forming system

Abstract

The purpose of the present invention is to improve the rigidity of a power transmission system of a plurality of punches and stabilize the machining quality of a workpiece compared to the prior art. A punching machine according to the present embodiment is provided with: a drive shaft; a first conversion mechanism that converts the rotation of the drive shaft into a reciprocating sliding operation of the first slider at a lateral intermediate position of the drive shaft; and a pair of second conversion mechanisms that convert the rotation of the drive shaft into a reciprocating sliding action of the second slider at two positions sandwiching the first conversion mechanism therebetween, and that have a bottom dead center different from that of the first conversion mechanism. The second slider is provided with a second sliding plate disposed below and behind the drive shaft, and a pair of box walls protruding from the front surface of the second sliding plate and facing each other in the lateral direction. The first slider is provided with a first slide bar that has a prism shape extending in the vertical direction and is slidably supported by the second slider between the pair of tank walls. The pair of second conversion mechanisms is a crank mechanism and includes a pair of crank portions formed on the drive shaft, a pair of shaft support portions provided on the upper surfaces of the pair of box walls, and a pair of links having both end portions rotatably supported by the pair of crank portions and the pair of shaft support portions.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a punch press and a container forming system having the same. BACKGROUND

[0002] As a conventional punch press, there is known a punch press in which a first punch provided with an air-driven piston is fixed to a press head, and a second punch is fixed to the piston, and a work is subjected to two punch press processes by one cycle operation (for example, refer to Patent Literature 1).

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent No. 6556594 (paragraph 0016, Figure 1 ) SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In the above-described conventional punch press, since air is contained in the power transmission system of the second punch, the rigidity is low, and there is a problem that the processing quality is unstable due to the work. Therefore, in the present application, a technology capable of improving the rigidity of the power transmission system of a plurality of punches compared to the past and stabilizing the processing quality of the work is disclosed.

[0008] MEANS FOR SOLVING THE PROBLEMS

[0009] The punch of one aspect of the invention of the present disclosure includes: first and second sliders supported so as to be slidable in the up-down direction and each fixed with a punch; a drive shaft provided commonly with respect to the first and second sliders and rotationally driven with a rotation axis extending in the lateral direction as a center; a first conversion mechanism disposed at a middle position of the lateral direction of the drive shaft and converting rotation of the drive shaft into a reciprocating sliding motion of the first slider; and a pair of second conversion mechanisms disposed at two positions sandwiching the first conversion mechanism in the lateral direction, converting rotation of the drive shaft into a reciprocating sliding motion of the second slider, and having a different lower dead point from the first conversion mechanism, wherein the second slider includes: a second sliding plate in a plate shape having a main plane in a front-rear direction orthogonal to the lateral direction and disposed below and behind the drive shaft; and a pair of box walls protruding from a front surface of the second sliding plate and opposed in the lateral direction, the first slider includes a first sliding rod in a prismatic shape extending in the up-down direction and housed between the pair of box walls and supported to the second slider in a slidable manner, and the pair of second conversion mechanisms are crank mechanisms and include: a pair of crank portions formed in the drive shaft; a pair of shaft support portions provided to upper surfaces of the pair of box walls; and a pair of links rotatably supported at both end portions to the pair of crank portions and the pair of shaft support portions. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a perspective view of a punch of the first embodiment.

[0011] Figure 2 is a perspective view of the first to third conversion mechanisms viewed from below.

[0012] Figure 3 is a perspective view of a movable portion of the punch.

[0013] Figure 4 is a perspective view of a movable portion of the punch, partially cut away.

[0014] Figure 5 is a main sectional view of a punch and a die.

[0015] Figure 6 is a main sectional view of a punch and a die for blanking a workpiece from a metal sheet.

[0016] Figure 7A is a main sectional view of a punch and a die for drawing a workpiece from a blank, Figure 7B is a main sectional view of a punch and a die for further drawing a workpiece.

[0017] Figure 8is a front view of a container forming system of a second embodiment. DETAILED DESCRIPTION

[0018] [First Embodiment]

[0019] Hereinafter, a punch 10 of a first embodiment of the present disclosure will be described with reference to Figure 1 ~ Fig. 7. In Figure 1 , the punch 10 is shown in a state where a plurality of dies 71, 72, 73, a plurality of punches 52, 53 (refer to Figure 5 ), and the like are detached. As shown in the figure, the support frame 15 of the punch 10 of the present embodiment is provided with: a pair of support opposite walls 11 that are opposed in the lateral direction H1; a top wall 13 that is erected between the upper end portions of the pair of support opposite walls 11; a base portion 12 that is erected between the lower positions of the pair of support opposite walls 11; and a back support wall 14 that is erected between the upper positions of the rear edge portions of the pair of support opposite walls 11.

[0020] Note that, in the present specification, in the case of being referred to as "left" or "right", it means "left" or "right" when the punch 10 is viewed from the front. In addition, a part of the plurality of components described below is divided into a plurality of parts in order to be able to assemble the components with each other and is integrated by a bolt or the like, but such a structure is omitted on the drawing.

[0021] The upper side portion of the front surface of the pair of support opposite walls 11 than the substantially central position in the vertical direction H3 is shifted to the rear side than the lower side portion. Also, the drive shaft 16 is rotatably supported to a pair of bearing portions 15J provided at positions near the upper end of the front edge portions of the pair of support opposite walls 11. In addition, although not shown, one end portion of the drive shaft 16 is extended to the side from one support opposite wall 11 and is connected to a motor as a drive source, for example, via a belt wheel or a gear.

[0022] A pair of cams 40 is provided to both end portions between the pair of bearing portions 15J in the drive shaft 16. The pair of cams 40 is, for example, circular and is configured so that the centers of the pair of cams 40 are offset from the rotation axis J1 (refer to Figure 4 ) of the drive shaft 16. That is, the pair of cams 40 is eccentric with respect to the drive shaft 16. In addition, the pair of cams 40 is of the same shape and is configured so as to be just coincident when viewed from the rotation axis direction of the drive shaft 16.

[0023] Cams 43 and 44 are provided approximately at the center between a pair of bearing portions 15J in the drive shaft 16. Cam 43 is, for example, non-circular and is positioned precisely at the center between the pair of bearing portions 15J. Cam 44 is also, for example, non-circular and is spaced apart from each other on the left side adjacent to cam 43. The thickness of cam 43 is the same as the thickness of cam 40, while the thickness of cam 44 is less than half the thickness of cams 40 and 43. Furthermore, when viewed from the rotation axis direction of the drive shaft 16, the cam 43 furthest from the rotation axis J1 (see reference...) Figure 4 The phase of the portion of cam 44 furthest from the rotation axis J1 in cam 40 is offset to one side in the rotation direction of drive shaft 16, and the phase of the portion of cam 44 furthest from the rotation axis J1 in cam 43 is located approximately 180 degrees opposite to the phase of the portion of cam 43 furthest from the rotation axis J1.

[0024] A pair of crank portions 42 are provided at two locations in the drive shaft 16: between the central portion and one end of a pair of bearing portions 15J, and between the central portion and the other end. Specifically, as shown... Figure 4 As shown, the drive shaft 16 has a shaft body 16H with a circular cross-section centered on its rotation center. Cams 40, 43, and 44 are fixed to the shaft body 16H in a manner that allows them to rotate integrally. Furthermore, the shaft body 16H is divided into the two aforementioned portions, and each end of the divided portion of the shaft body 16H has a rectangular opposing plate portion 42B that can rotate integrally. An eccentric shaft portion 42A, offset from the central axis of the shaft body 16H (the rotation axis J1 of the drive shaft 16) and parallel to the shaft body 16H, is mounted between each pair of opposing plate portions 42B, and the eccentric shaft portions 42A are coaxially arranged. Additionally, the line (not shown) connecting the central axis of the eccentric shaft portion 42A and the rotation axis J1 of the drive shaft 16 lies between the phase of the portion of the cam 40 furthest from the rotation axis J1 and the phase of the portion of the cam 43 furthest from the rotation axis J1.

[0025] like Figure 2 As shown, a third sliding member 23 is provided on the front side of the rear support wall 14. The third sliding member 23 has a third sliding plate 23A opposite to the rear support wall 14, and the third sliding plate 23A is connected to the rear support wall 14 via a pair of sliding components 31 in a manner that allows it to slide in the vertical direction H3. Each sliding component 31 has a guide rail 31A extending in the vertical direction H3 and a plurality of engaging members 31B that can slide and engage with the guide rail 31A. Furthermore, the pair of guide rails 31A are fixed to the front surface of the rear support wall 14 at intervals in the horizontal direction H1, and the plurality of engaging members 31B are fixed to the rear surface of the third sliding plate 23A at intervals in the vertical direction H3.

[0026] like Figure 3As shown, the third sliding member 23 includes: a pair of longitudinal ribs 23B that protrude from the front surface of the third sliding plate 23A near the sides and extend from the lower end of the third sliding plate 23A near the upper end; a pair of longitudinal ribs 23C that protrude from the front surface of the third sliding plate 23A on both sides and are opposed to the upper part of the pair of longitudinal ribs 23B from the side; and a transverse rib 23F that protrudes from the lower edge of the front surface of the third sliding plate 23A and is orthogonal to the pair of longitudinal ribs 23B.

[0027] like Figure 4 As shown, at a pair of longitudinal ribs 23C, the middle portion in the vertical direction H3 is cut off to form a recess 23D. A pair of longitudinal ribs 23B also have a recess 23E opposite to the recess 23D of the pair of longitudinal ribs 23C. Furthermore, a pair of support shafts 23S are mounted between adjacent longitudinal ribs 23B and 23C, and these support shafts 23S are arranged opposite each other across the recesses 23D and 23E. Moreover, rollers 23R are rotatably supported on each support shaft 23S. Furthermore, the aforementioned cam 40 is sandwiched between the vertically opposite pairs of rollers 23R from the vertical direction H3. Thus, a cam mechanism, namely the third conversion mechanism 3, is formed that converts the rotation of the drive shaft 16 into the sliding action of the third slider 23 (see reference). Figure 1 , 2 ).

[0028] like Figure 4 As shown, the portion of the third slider 23 surrounded by a pair of longitudinal ribs 23B, transverse ribs 23F, and a third sliding plate 23A includes a second slider 22. The second slider 22 includes a second sliding plate 22A opposite to the third sliding plate 23A of the third slider 23, as shown... Figure 2 As shown, the second sliding plate 22A and the third sliding plate 23A are connected via a pair of sliding components 32, which are the same as the aforementioned sliding component 31, in a manner that allows them to slide in the vertical direction H3.

[0029] like Figure 4 As shown, a pair of box walls 22B protrude from the front surface of the second sliding plate 22A of the second sliding member 22. The pair of box walls 22B are elongated box-shaped with open front surfaces, symmetrically spaced apart on the front surface of the second sliding plate 22A. Furthermore, a pair of opposing walls 22C in the pair of box walls 22B extend above the pair of box walls 22B; correspondingly, the portion between the pair of opposing walls 22C in the second sliding plate 22A also extends above the pair of box walls 22B. A square groove 22K is formed in the center of the transverse direction H1 of the sliding member 22 through the pair of opposing walls 22C and the second sliding plate 22A.

[0030] A pair of shaft support portions 22D are provided on the upper surface of a pair of housing walls 22B at a position away from the square groove portion 22K in the transverse H1. Each shaft support portion 22D is configured to connect the lower ends of a pair of opposing walls 22D1 in the transverse H1 by a connecting wall 22D2, which is fixed in a state of overlapping with the upper surface of each housing wall 22B. In addition, a support shaft 22S is provided between the pair of opposing walls 22D1 of each shaft support portion 22D. Furthermore, a connecting rod 24 is provided between the pair of support shafts 22S of the second sliding member 22 and the eccentric shaft portion 42A of the pair of crank portions 42 of the drive shaft 16, respectively. The connecting rod 24 is rotatably supported on the support shafts 22S and the eccentric shaft portion 42A. Thus, a crank mechanism, namely the second conversion mechanism 2 (see reference), is formed to convert the rotation of the drive shaft 16 into the sliding action of the second sliding member 22. Figure 1 , 2 ).

[0031] like Figure 3 As shown, a portion of the first slider 21 is housed within the square groove 22K of the second slider 22. The first slider 21 includes: a prism-shaped first sliding rod 21A extending in the vertical direction H3; a cage portion 25 fixed to the upper end of the first sliding rod 21A; and a pair of guide rods 26 extending upward from the cage portion 25. The first sliding rod 21A is housed within the square groove 22K.

[0032] like Figure 2 As shown, the first sliding rod 21A is connected via a sliding assembly 33 disposed within the square groove portion 22K in a manner that allows it to slide in the vertical direction H3. It should be noted that the sliding assembly 33 includes: a guide rail portion 33A, which is fixed to the bottom surface of the square groove portion 22K and extends in the vertical direction H3; and a sliding engagement portion 33B, which is fixed to both sides of the first sliding rod 21A and engages with both sides of the guide rail portion 33A.

[0033] like Figure 1 As shown, a pair of guide rods 26 are arranged parallel to each other at a distance in the front-rear direction H2, and their upper ends are connected by plate members 26A. Additionally, a guide piece 26G extends forward from the upper part of the third sliding plate 23A of the third slider 23, and a pair of guide rods 26 pass through a pair of guide holes that extend vertically through the guide piece 26G. That is, the first slider 21 is slidably supported by both the third slider 23 and the second slider 22. It should be noted that a through hole 13A is formed in the top wall 13 of the support frame 15 to avoid interference with the guide rods 26.

[0034] like Figure 3As shown, the cage portion 25 has a pair of longitudinally elongated frame portions 25F facing each other in the transverse direction H1, and connecting walls 25X and 25Y connecting the upper ends and lower ends of the pair of frame portions 25F to each other, respectively. Furthermore, a pair of guide rods 26 extend upward from the upper connecting wall 25X, and a first sliding rod 21A hangs down from the lower connecting wall 25Y.

[0035] A support shaft 21S is mounted between the lower ends of a pair of frame portions 25F, and a roller 21R is rotatably supported on the support shaft 21S. Additionally, as... Figure 4 As shown, the support wall 25A extends from the upper side of the cage 25 to the left, and bends downward at a right angle midway. Furthermore, a support shaft 25S is provided between the support wall 25A and the upper side of the cage 25, and a roller 25R is rotatably supported on the support shaft 25S.

[0036] The aforementioned cam 43 is accommodated between a pair of frame portions 25F. The shaft body 16H of the drive shaft 16 extends through the pair of frame portions 25F along the transverse direction H1. The cam 44 is positioned adjacent to the left side of the cage portion 25. Furthermore, the roller 21R abuts against the cam 43 from below, and the roller 25R abuts against the cam 44 from above. Thus, a cam mechanism is formed that converts the rotation of the drive shaft 16 into the sliding action of the first slider 21, namely the first conversion mechanism 1 (see reference). Figure 1 , 2 Hereinafter, the cam 43 used to press down the first sliding rod 21A will be appropriately referred to as the "lowering cam 43", and the cam 44 used to pull up the first sliding rod 21A will be appropriately referred to as the "raising cam 44".

[0037] like Figure 3 As shown, the lower end of the first sliding rod 21A of the first sliding member 21 becomes the punch holder 21H, where the first punch 51 is fixed. Figure 1 As shown, the first punch 51 is formed with a punch body 51B at the lower end of a shaft portion 51A extending in the vertical direction H3. The upper end of the shaft portion 51A is held in the punch holder 21H and extends to a position lower than the third slider 23 via a cutout 23G formed in the transverse rib 23F of the third slider 23. Furthermore, the punch body 51B has a planar shape formed by chamfering the corners of a rectangle that is longer in the front-rear direction H2.

[0038] An outer side of the first punch 51 is fitted with Figure 5 The second punch 52 is shown, and a punch holder (not shown) for holding the second punch 52 is also shown. The punch holder for the second punch is, for example, formed with a flange extending from the upper end of a fitting cylinder portion that fits onto the outside of the shaft portion 51A. This flange is fixed to... Figure 3The lower surface of the second slider 22 is shown. Furthermore, the fitting cylinder portion extends through the cutout 23G of the third slider 23 to a position lower than the third slider 23.

[0039] The second punch 52 has a cylindrical portion 52A fixed to the lower end of the punch holder for the second punch and fitted with the outer side of the shaft portion 51A of the first punch 51, and a punch body 52B disposed at the lower end thereof. The punch body 52B of the second punch 52 has a box-shaped structure that is one size larger than the punch body 51B of the first punch 51, and its inner side forms a lower surface recess 52C that can just accommodate the lower surface of the punch body 51B of the first punch 51.

[0040] The outer side of the cylindrical portion 52A of the second punch 52 is fitted with Figure 5 The diagram shows a third punch 53 and a punch holder 53H for holding the third punch 53. The punch holder 53H includes a fitting cylinder portion 53J that engages with the outer side of the cylinder portion 52A, a holder body 53K fixed to the lower end of the fitting cylinder portion 53J, and a flange portion (not shown) extending laterally from the upper end of the fitting cylinder portion 53J, which is fixed to the lower surface of the third sliding member 23. Furthermore, the holder body 53K has a through hole 53L through which the cylinder portion 52A of the second punch 52 passes, and a lower surface recess 53M communicating with the through hole 53L and having an open lower surface. The third punch 53, except for its lower portion, is fixed in a state where it engages with the lower surface recess 53M.

[0041] The third punch 53 has a through hole 53A through which the cylindrical portion 52A of the second punch 52 passes, and a lower surface recess 53B that communicates with the through hole 53A and has an open lower surface. Furthermore, the lower surface recess 53B can accommodate the punch body 52B of the second punch 52. Additionally, the lower part of the third punch 53 has a planar shape that is, for example, an ellipse that is longer in the front-rear direction H2.

[0042] In the pedestal portion 12 of the support frame 15 (see reference) Figure 1 A pad (not shown) is fixed on top, and on top of that, a... Figure 5 The die holder 60 shown has a workpiece transport space 61 extending laterally along H1, and a support portion 62 thereon. It should be noted that... Figure 5 Only one of the pair of legs 62A that are opposite each other from the lower support frame 62 and separated by the workpiece transport space 61 in the front-rear direction H2 is shown.

[0043] The support section 62 has a slit 63 extending in the front-rear direction H2. Furthermore, a die support hole 64 is provided in the support section 62 at a position lower than the slit 63. This die support hole 64 decreases in size in a stepped manner as it faces downwards and is divided into four levels of holes 64A to 64D. The third die 73 is fitted into the first level of holes 64A from the top, the second die 72 is fitted into the second level of holes 64B and overlaps with the lower surface of the third die 73, and the first die 71 is fitted into the third level of holes 64C and overlaps with the lower surface of the second die 72 and is fixed to the support section 62.

[0044] An elliptical third punch insertion hole 73A, corresponding to the shape of the lower part of the third punch 53, extends vertically through the third die 73. Furthermore, the opening edge of the third punch insertion hole 73A on the upper surface of the third die 73 becomes a horizontal plane, and around this horizontal plane is an inclined surface 73C that gently descends as it separates from the third punch insertion hole 73A to the side.

[0045] A rectangular second punch insertion hole 72A, corresponding to the shape of the punch body 52B of the second punch 52, extends vertically through the second die 72. Furthermore, the portion of the upper surface of the second die 72 surrounding the second punch insertion hole 72A is exposed within the third punch insertion hole 73A of the third die 73, and the corner where the upper surface of the second die 72 intersects with the second punch insertion hole 72A is chamfered into a rounded shape.

[0046] A rectangular first punch insertion hole 71A, corresponding to the shape of the punch body 51B of the first punch 51, extends vertically through the first die 71. Furthermore, the portion of the upper surface of the first die 71 surrounding the first punch insertion hole 71A is exposed within the second punch insertion hole 72A of the second die 72, and the corner where the upper surface of the first die 71 intersects with the first punch insertion hole 71A is chamfered into a rounded shape.

[0047] A recess is formed on the upper surface of the slit 63 in the die holder 60, and the plate pressing member 74 is fixed in the recess in a fitted state. Furthermore, the lower part of the plate pressing member 74 protrudes from the upper surface of the slit 63 and is positioned opposite the upper surface of the third die 73 with a gap. Additionally, a through hole 74A, with a shape approximately the same as the third punch insertion hole 73A of the third die 73, passes through the plate pressing member 74 vertically. Moreover, a through hole 60A, which is larger than the through hole 74A, is formed in the upper part of the die holder 60 compared to the plate pressing member 74.

[0048] A sheet metal feeding device (not shown) is provided behind the die holder 60 to feed the sheet metal 90 toward the slit 63. The sheet metal feeding device operates synchronously with the rotation of the drive shaft 16, and the drive shaft 16 feeds the sheet metal toward the slit 63 by a predetermined amount for each revolution.

[0049] In addition, such as Figure 1 As shown, a pair of opposing support walls 11 of the support frame 15 have openings 11A at positions opposite the die holder 60 in the transverse direction H1. Furthermore, a workpiece transport device (not shown) extends through the pair of windows 11A and the workpiece transport space 61 (see reference). Figure 5 The workpiece handling device, for example, includes a sliding base that reciprocates along the transverse direction H1 via a ball screw mechanism, and a pair of fingers that extend cantilevered from the sliding base to the right and are opposed to each other in the longitudinal direction H2. The pair of fingers open and close in a manner that brings them closer together and separates from each other, and are subjected to force on the side that brings them closer together.

[0050] It should be noted that the metal sheet feeding device and the workpiece handling device may have a motor different from the motor that serves as the drive source of the drive shaft 16, or they may receive power from the motor that serves as the drive source of the drive shaft 16.

[0051] The above is a description of the structure of the stamping press 10 according to this embodiment. According to this stamping press 10, a container-shaped workpiece 92 with a bottom at one end is formed from a metal sheet 90 as follows.

[0052] That is, when the press 10 starts and the drive shaft 16 is driven to rotate, such as Figure 5 As shown, a sheet metal 90 is fed from the sheet metal feeding device between the third die 73 of the die holder 60 and the sheet pressing member 74. Then, with the lower surface recess 53B of the third punch 53 accommodating the punch body 52B of the second punch 52 and the lower surface recess 52C of the punch body 52B accommodating the punch body 51B of the first punch 51, the third punch 53 descends, as shown. Figure 6 As shown, an oval blank 91 is punched out from a metal sheet 90.

[0053] Then, the third punch 53 reaches its lower stop, and the blank 91 is sandwiched between the upper surface of the second die 72 and the lower surface of the third punch 53. In this state, the second punch 52 and the first punch 51 descend further, as... Figure 7A As shown, the blank 91 is pressed into the second punch insertion hole 72A of the second die 72 and formed into a workpiece 92 with an open upper surface and a generally rectangular shape.

[0054] Then, after the second punch 52 reaches its lower stop and its lower end reaches the upper surface of the first die 71, the first punch 51 descends further, as... Figure 7B As shown, the workpiece 92 is pressed into the first punch insertion hole 71A and is drawn or squeezed. Then, when the workpiece 92 is pressed against the lower surface of the workpiece transport space 61 below the stand portion 62, the first punch 51 reaches the lower stop point.

[0055] At this time, a pair of fingers of the workpiece transport device are waiting below the first punch insertion hole 71A, and the workpiece 92 is pressed between the pair of fingers from above. Furthermore, the opposing surfaces of the pair of fingers (in other words, the surfaces of the fingers facing the first punch 51) have locking portions that engage with the upper surface of the workpiece 92, thereby disengaging the workpiece 92 from the first punch 51 as it rises past the lower stop point. Then, the workpiece transport device transports the workpiece 92 to the outside of the right-side window 11A, where, for example, a guide (not shown) slides into contact with the pair of fingers, opening them, and the workpiece 92 is housed in the lower receiving box. Then, the pair of fingers return to the position below the stand 62. The press 10 repeatedly performs the above-described operation (i.e., a cyclic operation) to form multiple workpieces 92.

[0056] The stamping machine 10 according to this embodiment has the following effects. As described above, the stamping machine 10 of this embodiment has a common drive shaft 16 provided with respect to the first to third sliding members 21, 22, 23 that respectively fix the punches 51, 52, 53. Furthermore, by converting the rotation of the drive shaft 16 into the sliding motion of the first to third sliding members 21, 22, 23 through the first to third conversion mechanisms 1, 2, 3, the rigidity of the power transmission system for multiple punches is increased compared to conventional structures that utilize air in the power transmission system, resulting in more stable workpiece processing quality. Here, the second conversion mechanism 2 is configured as a pair of crank mechanisms that sandwich the first conversion mechanism 1 in the transverse direction H1. Furthermore, in order to receive the force from the drive shaft 16 via a pair of connecting rods 24 of the pair of crank mechanisms, the second sliding member 22 is configured such that a pair of housing walls 22B protrude from the front surface of the second sliding plate 22A, and a pair of connecting rods 24 are supported on a pair of shaft support portions 22D on the upper surface of the pair of housing walls 22B. Thus, the second slider 22 can be lightweight while possessing high strength. In addition, the first slider 21 is prismatic in shape extending in the vertical direction H3, and has a first sliding rod 21A that is accommodated between a pair of box walls 22B and slidably supported on the second slider 22. Therefore, the first slider and the second sliders 21 and 22 are compactly assembled.

[0057] Furthermore, the stamping press 10 of this embodiment performs stamping operations on the workpiece three times in one cycle, which is more than in the past. Therefore, when the workpiece is stamped three times, using the stamping press 10 of this embodiment eliminates the need for an additional stamping press compared to using a conventional stamping press. Additionally, when the workpiece is stamped four or more times, using the stamping press 10 of this embodiment allows for a smaller additional stamping press compared to using a conventional stamping press. Furthermore, the stamping press 10 of this embodiment is configured such that a first sliding rod 21A, a second sliding plate 22A, and a third sliding plate 23A overlap in front of a back support wall 14 erected between a pair of opposing support walls 11 that support the drive shaft 16 for rotatability. Therefore, the three sliding members 21, 22, and 23 with the first to third sliding plates are compactly housed.

[0058] Furthermore, the pair of third conversion mechanisms 3 constitute a cam mechanism having a pair of circular cams 40 eccentric to the drive shaft 16. Two pairs of rollers 23R, supported rotatably by two pairs of longitudinal ribs 23B, 23C extending forward from the sides of the second sliding plate 22A in the third sliding plate 23A, abut against the pair of cams 40 from above and below. Moreover, the pair of longitudinal ribs 23B are configured to extend to the lower end of the third sliding plate 23A and oppose the pair of box walls 22B laterally H1, thus strengthening the third sliding plate 23A using the longitudinal ribs 23B supporting the rollers 23R.

[0059] Furthermore, the first conversion mechanism 1 is a cam mechanism comprising a lowering cam 43 for pressing down the first sliding rod 21A and an raising cam 44 for raising the first sliding rod 21A. Additionally, on the first sliding member 21, the upper ends and lower ends of a pair of frame portions 25F, which are opposed to each other across the lowering cam 43 and through which the drive shaft 16 passes, are connected to each other by connecting walls 25X and 25Y respectively, and fixed to the upper end of the cage portion 25 of the first sliding rod 21A, and rollers 21R and 25R rotatably supported on the cage portion 25, abut against the lowering cam 43 and the raising cam 44, thus enabling miniaturization of the first sliding member 21.

[0060] [Second Implementation]

[0061] Figure 8 An embodiment of the container forming system 89 of the present invention is shown. This container forming system 89 includes a stamping press 10 as described in the first embodiment and a multi-station stamping press 80 disposed adjacent to its right side. A plurality of punches 82 are arranged at equal intervals along a transverse direction H1 on the press head 81 of the multi-station stamping press 80, and a plurality of die holders 83 (not shown) are arranged below the press head 81 to hold a plurality of dies corresponding to the plurality of punches 82.

[0062] The conveying device 85 of the multi-station stamping press 80 includes: a pair of guide rails 85R, which are disposed above a plurality of die holders 83 and extend laterally H1 and are opposed to each other in the longitudinal direction H2; and a plurality of pairs of fingers 85F, which are supported so as to be movable relative to the pair of guide rails 85R in the longitudinal direction H2 and are opposed to each other in the longitudinal direction H2. Furthermore, each pair of fingers 85F is forced towards the side that brings them closer together. Moreover, the lateral distance H1 between the fingers 85F is the same as the distance between the punches 82.

[0063] The support frame 80F of the multi-station press 80 has a pair of opposing support walls 80S with through windows (not shown) extending along the transverse direction H1. Then, a pair of guide rails 85R extend through the through window of the right-side opposing support wall 80S, and the outer surface of the right-side opposing support wall 80S has a drive mechanism (not shown) for reciprocating the pair of guide rails 85R along the transverse direction H1.

[0064] In the container forming system 89 of this embodiment, the stamping press 10 and the multi-station stamping press 80 operate in the same cycle. The pair of fingers of the workpiece transport device of the aforementioned stamping press 10 transport the workpiece 92 to the processing table below the left-hand punch 82 in the multi-station stamping press 80. Then, before the stamping press 10 forms the next workpiece 92, the press head 81 of the multi-station stamping press 80 moves to the lower stop point, and the left-hand punch 82 presses the workpiece 92 into the punch insertion hole of the die, causing the workpiece 92 to disengage from the pair of fingers of the workpiece transport device.

[0065] Furthermore, before the next workpiece 92 formed by the stamping machine 10 is completed, a pair of fingers of the workpiece conveying device return to the position below the first punch insertion hole 71A of the stamping machine 10 and stand by. Before each punch 82 of the multi-station stamping machine 80 is pulled out from the punch insertion hole, each pair of fingers 85F of the conveying device 85 moves to the left end of the reciprocating stroke and stands by above each punch insertion hole.

[0066] Then, approximately simultaneously with the first punch 51 of the stamping press 10 reaching its lower stop, each punch 82 of the multi-station stamping press 80 is pulled out from its respective punch insertion hole, and the workpiece 92 is transferred from the first punch 51 to a pair of fingers of the workpiece transport device, and from the left-hand punch 82 to the left-hand fingers 85F of the conveying device 85. Then, as described above, the pair of fingers of the workpiece transport device transports the new workpiece 92 to below the left-hand punch 82, and the left-hand fingers 85F move to the right end of the reciprocating stroke, moving the workpiece 92 to below the second punch 82 from the left.

[0067] The above actions are repeated, and the container-shaped workpiece 92 with a bottom at one end, formed by the stamping press 10, is repeatedly drawn or thinned by the multi-station stamping press 80 to form a rectangular workpiece 92 that is longer and thinner than the workpiece 92 just formed by the stamping press 10. Then, the workpiece 92, which has finished forming by the multi-station stamping press 80, is discharged downward from the conveyor 85 on the outside of the support opposing wall 80S on the right side of the multi-station stamping press 80 and housed in a receiving box (not shown).

[0068] [Other Implementation Methods]

[0069] In the first embodiment described above, the first and third conversion mechanisms 1 and 3 are cam mechanisms, but either or both of the first and third conversion mechanisms 1 and 3 may also be crank mechanisms. In this case, for example, the third slider 23 may also be provided with the same pair of housing walls as the second slider 22, and a connecting rod may be connected to the shaft support portion at its upper part. In addition, when a cam mechanism is provided, it may be circular as described above for cam 40, or it may be two sets of non-circular cams as described above for cams 43 and 44.

[0070] The workpiece 92 formed by the stamping machine 10 of the first embodiment has a rectangular planar shape, but is not limited to this. It can also be a polygon or irregular shape other than a circle or rectangle.

[0071] In the stamping press 10 of the first embodiment, the third punch 53 punches the blank 91 from the metal sheet 90, and the first and second punches 51 and 52 draw the blank 91. However, as long as the first to third punches 51, 52, and 53 perform processing at different times in one cycle, the processing based on the first to third punches 51, 52, and 53 is not limited to the first embodiment. For example, a through hole can be made at the bottom of the workpiece 92 after it has been drawn by the first punch 51 and the second punch 52, or the first to third punches 51, 52, and 53 can be used to perform three deep drawing or thinning processes on a workpiece that has been pre-formed into a container shape.

[0072] <Postscript>

[0073] Hereinafter, the feature groups extracted from the above embodiments will be described while showing the effects, etc., as needed. It should be noted that, for ease of understanding, the structures corresponding to the above embodiments will be appropriately shown using parentheses, etc., but these feature groups are not limited to the specific structures shown by parentheses, etc.

[0074] [Feature 1]

[0075] A stamping press (10) comprises: a first sliding member and a second sliding member (21, 22) supported for sliding in a vertical direction (H3), and respectively fixed with punches (51, 52); a drive shaft (16) shared with the first sliding member and the second sliding member (21, 22), and driven to rotate about a rotation axis (J1) extending in a horizontal direction (H1); a first conversion mechanism (1) disposed at the middle position of the drive shaft (16) in the horizontal direction (H1), and converting the rotation of the drive shaft (16) into the reciprocating sliding motion of the first sliding member (21); and a pair of second conversion mechanisms (2) disposed at two positions in the horizontal direction (H1) that sandwich the first conversion mechanism (1), converting the rotation of the drive shaft (16) into the reciprocating sliding motion of the second sliding member (22), and having a lower stop point different from the first conversion mechanism (1), wherein the second sliding member (22) comprises: The second sliding plate (22A) is plate-shaped having a main plane oriented in a front-rear direction (H2) orthogonal to the transverse direction (H1) and is disposed below and behind the drive shaft (16); and a pair of housing walls (22B) protruding from the front surface of the second sliding plate (22A) and opposing each other in the transverse direction (H1), the first sliding member (21) having a first sliding rod (21A) which is prismatic in shape extending in the vertical direction (H3) and is received between the pair of housing walls (22B) and slidably supported on the second sliding member (22), the pair of second conversion mechanisms (2) being crank mechanisms and having: a pair of crank portions (42) formed on the drive shaft (16); a pair of shaft support portions (22D) disposed on the upper surface of the pair of housing walls (22B); and a pair of connecting rods (24) whose two ends are rotatably supported on the pair of crank portions (42) and the pair of shaft support portions (22D).

[0076] [Feature 2]

[0077] According to feature 1, the press (10) comprises: a third sliding member (23) supported to slide in the vertical direction (H3), and a punch (53) fixed thereon, and sharing the drive shaft (16) with the first sliding member and the second sliding members (21, 22); a pair of third conversion mechanisms (3) disposed at two positions in the horizontal direction (H1) that sandwich the pair of second conversion mechanisms (2), converting the rotation of the drive shaft (16) into the reciprocating sliding motion of the third sliding member (23), and having a lower stop point different from the first conversion mechanism (1) and the pair of second conversion mechanisms (2); and a pair of supporting opposing walls (11) in the horizontal direction. (H1) Opposite to each other, and supporting the drive shaft (16) so as to be rotatable; a back support wall (14) located behind the drive shaft (16) in the front-rear direction (H2) and mounted between the pair of opposing support walls (11); and a third sliding plate (23A) contained in the third sliding member (23), in the form of a plate with its main plane facing the front-rear direction (H2), and disposed between the back support wall (14) and the drive shaft (16), and slidably supported on the back support wall (14), the front surfaces of the second sliding plate (22A) overlapping the front surfaces of the third sliding plate (23A), and slidably supported on the third sliding plate (23A).

[0078] [Feature 3]

[0079] According to feature 2, the press (10) wherein the pair of third conversion mechanisms (3) are cam mechanisms having a pair of circular cams (40) eccentric to the drive shaft (16), and the third sliding member (23) includes: two pairs of longitudinal ribs (23B, 23C) which protrude forward and extend vertically from portions of the third sliding plate (23A) extending toward the sides of the second sliding plate (22A); and recesses (23D, 23E) formed in the two pairs of longitudinal ribs (23B). 23C), and accommodates the drive shaft (16); and two pairs of rollers (23R), which are held and supported for rotation by adjacent pairs of longitudinal ribs (23B, 23C) in the transverse (H1) and abut against the pair of cams (40) from above and below, at least one of the pairs of longitudinal ribs (23B, 23C) extending to the lower end of the third sliding plate (23A) and opposite the pair of box walls (22B) from the transverse (H1).

[0080] [Feature 4]

[0081] According to feature 2 or 3, the press (10) wherein the first conversion mechanism (1) is a cam mechanism having a lowering cam (43) for pressing down the first sliding rod (21A) and an raising cam (44) for pulling up the first sliding rod (21A), the first sliding member (21) includes: a cage (25) which is formed by connecting the upper ends and lower ends of a pair of frame portions (25F) that are opposed to each other across the lowering cam (43) and through which the drive shaft (16) passes, respectively, with connecting walls (25X, 25Y), and fixed to the upper end of the first sliding rod (21A); a lowering roller (21R) which is rotatably supported on the lower end of the cage (25) and abuts against the lowering cam (43) from below; and a raising roller (25R) which is rotatably supported on the upper side of the cage (25) and abuts against the raising cam (44) from above.

[0082] [Feature 5]

[0083] The stamping machine (10) according to any one of features 2 to 4, wherein the stamping machine (10) comprises: a first punch (51) fixed to the first sliding member (21); a cylindrical second punch (52) fixed to the second sliding member (22) and fitted to the outside of the first punch (51); a cylindrical third punch (53) fixed to the third sliding member (23) and fitted to the outside of the second punch (52); and a third die (73) having a third punch insertion hole (73A) for insertion of the third punch (53), and configured to be inserted into the third punch (51). The workpiece is formed by drawing a blank (91) from a sheet metal (90) in cooperation with the workpiece; a second die (72) is arranged below the third die (73) and has a second punch insertion hole (72A) for inserting the second punch (52), and is configured to draw a container-shaped workpiece (92) with a bottom at one end from the blank (91); and a first die (71) is arranged below the second die (72) and has a first punch insertion hole (71A) for inserting the first punch (51), and is configured to perform deep drawing, thinning or blanking on the workpiece (92).

[0084] [Feature 6]

[0085] According to feature 5, the stamping machine 10 is wherein the third punch (53) and the third punch insertion hole (73A) are elliptical or oblong or quadrilateral with four sides bulging outwards, the second punch (52) and the second punch insertion hole (72A) are quadrilaterals smaller than the third punch (53) and the third punch insertion hole (73A), and the first punch (51) and the first punch insertion hole (71A) are quadrilaterals smaller than the second punch (52) and the second punch insertion hole (72A).

[0086] [Feature 7]

[0087] A container forming system (89) comprising a multi-station press (80) and a press (10) described in section 6, wherein the multi-station press (80) performs multiple deep drawing on the workpiece (92) formed by the press (10).

[0088] The stamping press of feature 1 has a common drive shaft provided with a first sliding member and a second sliding member that are respectively fixed to the punch. Furthermore, since the rotation of the drive shaft is converted into the sliding action of the first and second sliding members by the first and second conversion mechanisms, the rigidity of the power transmission system for multiple punches is increased compared to conventional structures that utilize air in the power transmission system, resulting in more stable workpiece processing quality. Here, the second conversion mechanism is configured as a pair of crank mechanisms that laterally sandwich the first conversion mechanism. Moreover, in order to receive the force from the drive shaft via a pair of connecting rods of the pair of crank mechanisms, the second sliding member has a special structure. That is, the second sliding member is formed with a pair of housing walls protruding from the front surface of the second sliding plate, and a pair of connecting rods supported by a pair of shaft supports on the upper surface of these housing walls. Thus, the second sliding member can be lightweight while possessing high strength. In addition, since the first sliding member is prismatic in shape extending vertically and has a first sliding rod housed between the pair of housing walls and slidably supported on the second sliding member, the first and second sliding members are compactly integrated.

[0089] The stamping press of feature 2 has a first sliding member to a third sliding member sharing a drive shaft. That is, the number of times the workpiece is stamped in one cycle is three more than before. Therefore, when the workpiece is stamped three times, if the stamping press of feature 2 is used, no additional stamping press is needed compared to the case of using a conventional stamping press. In addition, when the workpiece is stamped four or more times, if the stamping press of feature 2 is used, the additional stamping press can be miniaturized compared to the case of using a conventional stamping press. Furthermore, in the stamping press of feature 2, a structure is formed in which a first sliding rod, a second sliding plate, and a third sliding plate overlap in front of a back support wall mounted between a pair of opposing support walls that support the drive shaft so that they can rotate, thus compactly housing the three sliding members, namely the first sliding plate and the third sliding plate.

[0090] Furthermore, in the stamping press of feature 3, a pair of third conversion mechanisms constitute a cam mechanism having a pair of circular cams eccentrically positioned relative to the drive shaft. Two pairs of rollers, rotatably supported by two pairs of longitudinal ribs extending forward from the sides of the second sliding plate in the third sliding plate, abut against the pair of cams from above and below. Moreover, since the structure forms a pair of longitudinal ribs extending to the lower end of the third sliding plate and laterally opposing the pair of box walls, the third sliding plate can be reinforced using the longitudinal ribs supporting the rollers.

[0091] Furthermore, in the stamping press of feature 4, the first conversion mechanism is a cam mechanism comprising a descending cam for pressing down the first sliding rod and a rising cam mechanism for pulling up the first sliding rod. Moreover, the first sliding member includes a cage portion whose upper and lower ends are respectively connected by a connecting wall to the upper end of a pair of frame portions facing each other across the descending cam and through which a drive shaft passes, and which is fixed to the upper end of the first sliding rod. A descending roller and a rising roller, rotatably supported on the cage portion, abut against the descending cam and the rising cam, thus enabling miniaturization of the first sliding member.

[0092] According to feature 5, in one cycle of operation, the blank punched from the metal sheet by the cylindrical third punch and third die fixed to the third sliding member is drawn into a container-shaped workpiece with one bottom by the cylindrical second punch and second die fixed to the second sliding member. The container-shaped workpiece with one bottom is further drawn, thinned or punched by the first punch and first die fixed to the first sliding member.

[0093] According to feature 6, the stamping press can form a container-shaped workpiece with a quadrilateral cross-section and a bottom at one end through a single cycle.

[0094] In the container forming system of feature 7, a multi-station stamping press can be used to draw the workpiece formed by the stamping press of feature 6 to form a longer and thinner quadrilateral container-shaped workpiece.

[0095] It should be noted that specific examples of the technology included in the technical solution are disclosed in this specification and the accompanying drawings, but the technology described in the technical solution is not limited to these specific examples, and also includes various modifications and alterations to the specific examples, as well as methods that extract a part of the specific examples separately.

[0096] Explanation of reference numerals in the attached figures:

[0097] 1 First conversion mechanism

[0098] 2 Second conversion mechanism

[0099] 3. Third conversion mechanism

[0100] 10. Stamping machine

[0101] 11 Supporting opposing walls

[0102] 14. Back Support Wall

[0103] 16 drive shafts

[0104] 21 First sliding member

[0105] 21A First sliding rod

[0106] 21R Roller (for descent)

[0107] 22 Second Slider

[0108] 22A Second Sliding Plate

[0109] 22B Box Wall

[0110] 23 Third sliding member

[0111] 23A Third Sliding Plate

[0112] 23B, 23C longitudinal ribs

[0113] 23D, 23E concave part

[0114] 23R rollers

[0115] 24-link

[0116] 25. Cage section

[0117] 25F frame

[0118] 25R rollers (for lifting)

[0119] 25X, 25Y connecting wall

[0120] 40 Cam

[0121] 42 Crank section

[0122] 43. Lowering Cam

[0123] 44. Lifting Cam

[0124] 51 First punch

[0125] 52 Second punch

[0126] 53 Third punch

[0127] 71 First Die

[0128] 71A First punch insertion hole

[0129] 72 Second Die

[0130] 72A Second Punch Insertion Hole

[0131] 73 Third Die

[0132] 73A Third Punch Insertion Hole

[0133] 80+ station stamping machine

[0134] 85 Conveying device

[0135] 89 Container Forming System

[0136] 90 Metal Sheets

[0137] 91 billet

[0138] 92 workpieces

[0139] H1 Horizontal

[0140] H2 Forward and backward directions

[0141] H3 Up and Down Direction

[0142] J1 Rotation axis.

Claims

1. A stamping press, comprising: The first and second sliding members are supported so as to be able to slide in the vertical direction, and each is fixed with a punch; A drive shaft is shared with the first and second sliders and is driven to rotate about a laterally extending axis of rotation. A first conversion mechanism is disposed at the middle position of the lateral direction of the drive shaft and converts the rotation of the drive shaft into the reciprocating sliding motion of the first slider. as well as A pair of second conversion mechanisms, configured at two positions in the lateral direction to sandwich the first conversion mechanism, convert the rotation of the drive shaft into the reciprocating sliding motion of the second slider, and having a different bottom dead center than the first conversion mechanism. in, The second slider includes: A second sliding plate, which is plate-shaped having a main plane oriented in a front-rear direction orthogonal to the transverse direction, is disposed below and behind the drive shaft; and A pair of box walls, which protrude from the front surface of the second sliding plate and are opposite each other in the lateral direction. The first sliding member includes a first sliding rod, which is prismatic in shape extending vertically and is housed between the pair of box walls, and is slidably supported on the second sliding member. The pair of second conversion mechanisms are crank mechanisms and include: a pair of crank portions formed on the drive shaft; a pair of shaft support portions disposed on the upper surfaces of the pair of housing walls; and a pair of connecting rods whose two ends are rotatably supported on the pair of crank portions and the pair of shaft support portions.

2. The stamping machine according to claim 1, wherein, The stamping press includes: The third slider is supported so as to be able to slide in the vertical direction and is fixed with a punch, and shares the drive shaft together with the first slider and the second slider; A pair of third conversion mechanisms are configured at two positions in the lateral direction to sandwich the pair of second conversion mechanisms, converting the rotation of the drive shaft into the reciprocating sliding motion of the third slider, and having a lower dead point different from the first conversion mechanism and the pair of second conversion mechanisms; A pair of opposing support walls, which are opposite each other in the lateral direction, respectively support the drive shaft so that it can rotate; A rear support wall is located behind the drive shaft in the front-rear direction and is mounted between the pair of opposing support walls; as well as A third sliding plate, included within the third sliding member, is plate-shaped with its main plane facing the front-rear direction, and is disposed between the back support wall and the drive shaft, and is slidably supported on the back support wall. The second sliding plate overlaps with the front surface of the third sliding plate and is supported on the third sliding plate in a slidable manner.

3. The stamping machine according to claim 2, wherein, The pair of third conversion mechanisms are cam mechanisms having a pair of circular cams that are eccentric to the drive shaft. The third slider includes: Two pairs of longitudinal ribs, the portions of which extend forward from the sides of the second sliding plate in the third sliding plate and extend in the vertical direction; A recess formed in the two pairs of longitudinal ribs and accommodating the drive shaft; and Two pairs of rollers, which are held and supported in the transverse direction by adjacent pairs of the two pairs of longitudinal ribs, are rotatable and abut against the pair of cams from above and below. At least one of the pairs of longitudinal ribs extends to the lower end of the third sliding plate and is opposite to the pair of box walls in the transverse direction.

4. The stamping machine according to claim 2 or 3, wherein, The first conversion mechanism is a cam mechanism comprising a descending cam for pressing down the first sliding rod and an ascending cam for pulling up the first sliding rod. The first slider includes: The cage is formed by connecting the upper and lower ends of a pair of frames that are opposed to each other by the descent cam and through which the drive shaft passes, with connecting walls respectively, and is fixed to the upper end of the first sliding rod. A lowering roller, rotatably supported at the lower end of the cage, abuts against the lowering cam from below; and The lifting roller is rotatably supported on the upper side of the cage and abuts against the lifting cam from above.

5. The stamping machine according to any one of claims 2 to 4, wherein, The stamping press includes: The first punch is fixed to the first sliding member; A cylindrical second punch is fixed to the second sliding member and fitted onto the outside of the first punch; A cylindrical third punch is fixed to the third sliding member and fitted onto the outside of the second punch; The third die has a third punch insertion hole for inserting the third punch, and is configured to cooperate with the third punch to punch out a blank from a sheet metal. The second die is stacked below the third die and has a second punch insertion hole for inserting the second punch, and is configured to draw from the blank to form a container-shaped workpiece with a bottom at one end. as well as A first die, which is stacked below the second die, has a first punch insertion hole for inserting the first punch, and is configured to perform deep drawing, thinning, or blanking on the workpiece.

6. The stamping machine according to claim 5, wherein, The third punch and the third punch insertion hole are elliptical, oblong, or quadrilateral with four sides bulging outwards. The second punch and its insertion hole are quadrilaterals smaller than the third punch and its insertion hole. The first punch and the first punch insertion hole are quadrilaterals smaller than the second punch and the second punch insertion hole.

7. A container forming system, wherein, The container forming system includes a multi-station stamping press and a conveying device for supplying the container-shaped workpiece to the multi-station stamping press, as described in claim 6. The multi-station stamping press performs multiple deep drawing processes on the workpiece formed by the stamping press.

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