Press and container molding system

Abstract

Conventionally, an object of the present invention is to increase the rigidity of the power transmission system of a plurality of punches to stabilize the processing quality of a workpiece. [Solution] The press machine 10 of the present disclosure is provided with a drive shaft 16 that is common to first and second sliders 21, 22 to which punches 51, 52 are fixed. The rotation of the drive shaft 16 is converted into sliding motion of the first and second sliders 21, 22 by cams 43, 44 and a crank 42, so that the rigidity of the power transmission system of the multiple punches 51, 52 is higher than in the conventional power transmission system that uses air, and it becomes possible to stabilize the processing quality of the workpiece 92 more than in the conventional system.

Description

[Technical field]

[0001] The present disclosure relates to a press and a container molding system having the press. [Background technology]

[0002] A known conventional press machine has a first punch fixed to a ram, which is equipped with an air-driven piston, and a second punch fixed to the piston, so that the workpiece is pressed twice in one cycle (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6556594 (paragraph

[0016] , Figure 1) Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional press machine described above, the power transmission system of the second punch contains air, which reduces rigidity, and there is a problem that the processing quality of some workpieces is unstable. Therefore, this application discloses a technology that can stabilize the processing quality of the workpiece by increasing the rigidity of the power transmission system of multiple punches more than before. [Means for solving the problem]

[0005] One aspect of the invention of the present disclosure is a press machine including first and second sliders supported to be slidable in a vertical direction and each having a punch fixed thereto; a drive shaft provided in common with the first and second sliders and driven to rotate about a rotation axis extending in a horizontal direction; a first conversion mechanism disposed at an intermediate position of the drive shaft in the horizontal direction 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 horizontal direction, converting rotation of the drive shaft into a reciprocating sliding motion of the second slider and having a bottom dead center different from that of the first conversion mechanism, wherein the second slider is oriented perpendicular to the horizontal direction. the first slider has a rectangular column shape extending in the up-down direction and comprises a first slide rod received between the pair of box walls and slidably supported by the second slider; and the pair of second conversion mechanisms are crank mechanisms comprising a pair of crank portions formed on the drive shaft, a pair of support portions provided on upper surfaces of the pair of box walls, and a pair of links rotatably supported at both ends by the pair of crank portions and the pair of support portions. Effect of the Invention

[0006] The press machine of the present disclosure is provided with a common drive shaft for the first and second sliders to which the punches are respectively fixed. The rotation of the drive shaft is converted into the sliding motion of the first and second sliders by the first conversion mechanism and the second conversion mechanism, so that the rigidity of the power transmission system of the multiple punches is higher than that of a conventional power transmission system that uses air, and the processing quality of the workpiece can be more stable than before. Here, the second conversion mechanism forms a pair of crank mechanisms with the first conversion mechanism sandwiched therebetween in the horizontal direction. In order to receive the force from the drive shaft through a pair of links of the pair of crank mechanisms, the second slider has a structure in which a pair of box walls protrude from the front surface of the second slide plate, and a pair of links are supported by a pair of journal portions on the upper surfaces of the pair of box walls. This allows the second slider to be lightweight yet highly strong. In addition, the first slider is shaped like a rectangular column extending in the vertical direction, is received between a pair of box walls, and is provided with a first slide rod slidably supported by the second slider, so that the first and second sliders are compactly arranged. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a press machine according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view of the first to third conversion mechanisms as viewed from below. [Diagram 3] FIG. 3 is a perspective view of the moving parts of the press machine. [Figure 4] FIG. 4 is a perspective view of a part of the press machine. [Diagram 5] Figure 5 is a cross-sectional view of the punch and die. [Figure 6] Figure 6 is a cross-sectional view of the punch and die used to punch out a blank from the sheet metal. [Figure 7] FIG. 7A is a front cross-sectional view of the punch and die used to draw a workpiece from a blank, and FIG. 7B is a front cross-sectional view of the punch and die used to further draw the workpiece. [Figure 8] FIG. 8 is a front view of a container molding system according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] [First embodiment] Hereinafter, a press machine 10 according to a first embodiment of the present disclosure will be described with reference to Figs. 1 to 7. Fig. 1 shows the press machine 10 with a plurality of dies 71, 72, 73, a plurality of punches 52, 53 (see Fig. 5), and the like removed. As shown in Fig. 1, a support frame 15 of the press machine 10 of this embodiment includes a pair of opposing support walls 11 opposed to each other in the horizontal direction H1, a ceiling wall 13 extending between the upper ends of the pair of opposing support walls 11, a base portion 12 extending between lower positions of the pair of opposing support walls 11, and a rear support wall 14 extending between upper positions of the rear edges of the pair of opposing support walls 11.

[0009] In this specification, "left" and "right" refer to the left and right when viewed from the front of the press 10. Some of the components described below are divided into multiple parts and integrated with bolts or the like to enable assembly of the parts, but such configurations are omitted from the drawings.

[0010] The upper portion of the front surface of the pair of opposing support walls 11 is shifted rearward from the approximate center position in the up-down direction H3 relative to the lower portion. A drive shaft 16 is rotatably supported by a pair of bearings 15J provided near the upper ends of the front edges of the pair of opposing support walls 11. Although not shown, one end of the drive shaft 16 protrudes laterally from one of the opposing support walls 11 and is connected to a motor serving as a drive source via, for example, a pulley or gear.

[0011] A pair of cams 40 are provided on both ends of the drive shaft 16 between the pair of bearing portions 15J. The pair of cams 40 are, for example, circular, and are arranged such that the centers of the pair of cams 40 and the rotation axis J1 (see FIG. 4) of the drive shaft 16 are offset. In other words, the pair of cams 40 are eccentric with respect to the drive shaft 16. The pair of cams 40 also have the same shape, and are arranged so as to overlap when viewed in the direction of the rotation axis of the drive shaft 16.

[0012] Cams 43 and 44 are provided at approximately the center between the pair of bearings 15J of the drive shaft 16. The cam 43 is, for example, non-circular and is disposed exactly in the center between the pair of bearings 15J. The cam 44 is, for example, non-circular and disposed to the left of the cam 43 with a gap therebetween. The thickness of the cam 43 is approximately the same as that of the cam 40, and the thickness of the cam 44 is less than half the thickness of the cams 40 and 43. When viewed from the direction of the rotation axis of the drive shaft 16, the phase of the part of the cam 43 farthest from the rotation axis J1 (see FIG. 4) is shifted to one side in the rotation direction of the drive shaft 16 with respect to the phase of the part of the cam 40 farthest from the rotation axis J1, and the phase of the part of the cam 44 farthest from the rotation axis J1 is located approximately 180 degrees opposite to the phase of the part of the cam 43 farthest from the rotation axis J1.

[0013] A pair of crank parts 42 are provided at two locations of the drive shaft 16 between the center and one end and between the center and the other end between the pair of bearing parts 15J. Specifically, as shown in FIG. 4, the drive shaft 16 has a shaft body 16H having a circular cross section with its rotation center as a central axis. The cams 40, 43, and 44 are fixed to the shaft body 16H so as to be integrally rotatable. The shaft body 16H is divided at the above-mentioned two locations, and rectangular opposing plate parts 42B are provided at each end of the divided part of the shaft body 16H so as to be integrally rotatable. An eccentric shaft part 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 inserted between each pair of opposing plate parts 42B, and the eccentric shaft parts 42A are arranged coaxially. In addition, a line (not shown) connecting the center axis of the eccentric shaft portion 42A and the rotation axis J1 of the drive shaft 16 is located between the phase of the part of the cam 40 that is farthest from the rotation axis J1 and the phase of the part of the cam 43 that is farthest from the rotation axis J1.

[0014] As shown in FIG. 2, a third slider 23 is provided on the front side of the rear support wall 14. The third slider 23 includes a third slide plate 23A facing the rear support wall 14, and the third slide plate 23A is connected to the rear support wall 14 via a pair of slide modules 31 so as to be slidable in the up-down direction H3. Each slide module 31 has a rail 31A extending in the up-down direction H3 and a plurality of engagement parts 31B slidably engaged with the rail 31A. The pair of rails 31A are fixed to the front surface of the rear support wall 14 at intervals in the lateral direction H1, and the plurality of engagement parts 31B are fixed to the rear surface of the third slide plate 23A at intervals in the up-down direction H3.

[0015] As shown in Figure 3, the third slider 23 is provided with a pair of vertical ribs 23B protruding from both sides of the front surface of the third slide plate 23A and extending from the lower end to the upper end of the third slide plate 23A, a pair of vertical ribs 23C protruding from both sides of the front surface of the third slide plate 23A and facing the upper parts of the pair of vertical ribs 23B from the sides, and a horizontal rib 23F protruding from the lower edge of the front surface of the third slide plate 23A and perpendicular to the pair of vertical ribs 23B.

[0016] As shown in FIG. 4, the pair of vertical ribs 23C is provided with recesses 23D by cutting out the middle part in the vertical direction H3, and the pair of vertical ribs 23B is also provided with recesses 23E facing the recesses 23D of the pair of vertical ribs 23C. A pair of support shafts 23S is inserted between the adjacent vertical ribs 23B and 23C, and the pair of support shafts 23S are arranged facing each other with the recesses 23D and 23E in between. Furthermore, a roller 23R is rotatably supported on each support shaft 23S. The above-mentioned cam 40 is sandwiched between each pair of rollers 23R facing each other from the vertical direction H3. This forms a third conversion mechanism 3 (see FIGS. 1 and 2) which is a cam mechanism that converts the rotation of the drive shaft 16 into the sliding motion of the third slider 23.

[0017] As shown in Fig. 4, a portion of the third slider 23 that is surrounded by a pair of vertical ribs 23B, horizontal ribs 23F, and the third slide plate 23A is provided with a second slider 22. The second slider 22 has a second slide plate 22A that faces the third slide plate 23A of the third slider 23, and as shown in Fig. 2, the second slide plate 22A and the third slide plate 23A are connected to each other so as to be slidable in the up-down direction H3 via a pair of slide modules 32 similar to the slide module 31 described above.

[0018] As shown in FIG. 4, a pair of box walls 22B protrude from the front surface of the second slide plate 22A of the second slider 22. The pair of box walls 22B are in the shape of a vertically long box with an open front surface, and are arranged symmetrically on the front surface of the second slide plate 22A with a gap therebetween. In addition, a pair of opposing walls 22C of the pair of box walls 22B that face each other are extended to a position above the pair of box walls 22B, and correspondingly, a portion between the pair of opposing walls 22C of the second slide plate 22A is also extended to a position above the pair of box walls 22B. A square groove portion 22K is formed in the center of the slider 22 in the lateral direction H1 by the pair of opposing walls 22C and the second slide plate 22A.

[0019] A pair of pivotal supports 22D are provided at positions on the upper surfaces of the pair of box walls 22B away from the square grooves 22K in the horizontal direction H1. Each pivotal support 22D has a structure in which a pair of opposing walls 22D1 facing each other in the horizontal direction H1 are connected to each other at the lower ends by a connecting wall 22D2, and the connecting wall 22D2 is fixed in a state in which it is overlapped on the upper surface of each box wall 22B. A support shaft 22S is inserted between the pair of opposing walls 22D1 of each pivotal support 22D. A link 24 is inserted between the pair of support shafts 22S of the second slider 22 and the eccentric shafts 42A of the pair of cranks 42 of the drive shaft 16, and is rotatably supported by the support shafts 22S and the eccentric shafts 42A. This forms a second conversion mechanism 2 (see FIGS. 1 and 2), which is a crank mechanism that converts the rotation of the drive shaft 16 into a sliding motion of the second slider 22.

[0020] 3, a part of the first slider 21 is received in the square groove portion 22K of the second slider 22. The first slider 21 includes a square column-shaped first slide rod 21A extending in the up-down direction H3, a cage portion 25 fixed to the upper end of the first slide rod 21A, and a pair of guide bars 26 extending upward from the cage portion 25. The first slide rod 21A is received in the square groove portion 22K.

[0021] 2, the first slide rod 21A is connected to the square groove portion 22K via a slide module 33 arranged in the square groove portion 22K so as to be slidable in the vertical direction H3. The slide module 33 includes a rail portion 33A fixed to the bottom surface of the square groove portion 22K and extending in the vertical direction H3, and slide engagement portions 33B fixed to both side surfaces of the first slide rod 21A and engaging with both side portions of the rail portion 33A.

[0022] As shown in Fig. 1, the pair of guide bars 26 are arranged in parallel with a gap in the front-rear direction H2, and their upper ends are connected by a plate member 26A. A guide piece 26G protrudes forward from the upper part of the third slide plate 23A of the third slider 23, and the pair of guide bars 26 are passed through a pair of guide holes that vertically penetrate the guide piece 26G. That is, the first slider 21 is supported slidably by both the third slider 23 and the second slider 22. A through hole 13A is formed in the ceiling wall 13 of the support frame 15 to avoid interference with the guide bar 26.

[0023] 3, the cage portion 25 has a pair of vertically elongated frame portions 25F facing each other in the horizontal direction H1, and connecting walls 25X, 25Y respectively connecting upper ends and lower ends of the pair of frame portions 25F. A pair of guide bars 26 extend upward from the upper connecting wall 25X, and a first slide rod 21A hangs down from the lower connecting wall 25Y.

[0024] A support shaft 21S is inserted between the lower ends of the pair of frame portions 25F, and roller 21R is rotatably supported by support shaft 21S. As shown in Fig. 4, a support wall 25A protrudes to the left from the upper end of the side surface of cage portion 25 and is bent downward at a right angle midway. A support shaft 25S is inserted between support wall 25A and the upper side surface of cage portion 25, and roller 25R is rotatably supported by support shaft 25S.

[0025] The cam 43 is received between the pair of frame portions 25F, and the shaft body 16H of the drive shaft 16 penetrates the pair of frame portions 25F in the horizontal direction H1, and the cam 44 is disposed to the left of the cage portion 25. The roller 21R abuts against the cam 43 from below, and the roller 25R abuts against the cam 44 from above. This forms a first conversion mechanism 1 (see Figs. 1 and 2) which is a cam mechanism that converts the rotation of the drive shaft 16 into the sliding motion of the first slider 21. Hereinafter, one cam 43 for pushing down the first slide rod 21A will be referred to as the "descent cam 43" as appropriate, and the other cam 44 for pulling up the first slide rod 21A will be referred to as the "ascension cam 44" as appropriate.

[0026] As shown in Fig. 3, the lower end of the first slide rod 21A of the first slider 21 is a punch holder 21H, to which a first punch 51 is fixed. As shown in Fig. 1, the first punch 51 has a structure in which a punch body 51B is provided at the lower end of a shaft portion 51A extending in the up-down direction H3. The upper end of the shaft portion 51A is held by the punch holder 21H and extends to a position below the third slider 23 through a notch 23G formed in a horizontal rib 23F of the third slider 23. The punch body 51B has a planar shape of a rectangle that is elongated in the front-rear direction H2 and has four chamfered corners.

[0027] The second punch 52 shown in Fig. 5 and a punch holder for the second punch (not shown) that holds the second punch 52 are fitted to the outside of the first punch 51. The punch holder for the second punch has a structure in which a flange portion protrudes from the upper end of a fitting cylinder portion that fits to the outside of the shaft portion 51A, and the flange portion is fixed to the lower surface of the second slider 22 shown in Fig. 3. In addition, the fitting cylinder portion extends through the cutout portion 23G of the third slider 23 to a position below the third slider 23.

[0028] The second punch 52 is provided with a tubular portion 52A that is fixed to the lower end of the punch holder for the second punch and fits onto the outside of the shaft portion 51A of the first punch 51, and a punch body 52B that is 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 inside forms a lower surface recess 52C that is open below and just large enough to receive the punch body 51B of the first punch 51.

[0029] The third punch 53 shown in FIG. 5 and the punch holder for the third punch 53H, which is partially shown and holds the third punch 53, are fitted to the outside of the cylindrical portion 52A of the second punch 52. The punch holder for the third punch 53H includes a fitting cylindrical portion 53J that fits to the outside of the cylindrical portion 52A, a holder body 53K fixed to the lower end of the fitting cylindrical portion 53J, and a flange portion (not shown) that protrudes laterally from the upper end of the fitting cylindrical portion 53J, and the flange portion is fixed to the lower surface of the third slider 23. The holder body 53K also has a through hole 53L through which the cylindrical portion 52A of the second punch 52 passes, and a lower surface recess 53M that communicates with the through hole 53L and has an open lower surface. The entire third punch 53 except for the lower portion is fixed in a state of being fitted into the lower surface recess 53M.

[0030] The third punch 53 has a through hole 53A through which the tubular portion 52A of the second punch 52 passes, and a bottom recess 53B that communicates with the through hole 53A and has an open bottom. The bottom recess 53B is capable of housing the punch body 52B of the second punch 52. The outer shape of the planar shape of the lower portion of the third punch 53 is, for example, an ellipse that is elongated in the front-rear direction H2.

[0031] A bolster (not shown) is fixed onto the base portion 12 (see FIG. 1) of the support frame 15, and a die holder 60 shown in FIG. 5 is fixed onto the bolster. The die holder 60 has a work transport space 61 penetrating in the lateral direction H1, and is provided with a base portion 62 thereon. Note that FIG. 5 shows only one of a pair of legs 62A that support the base portion 62 from below and face each other across the work transport space 61 in the front-rear direction H2.

[0032] The base 62 is provided with a slit 63 penetrating in the front-rear direction H2. A die support hole 64 that becomes smaller in a stepped manner toward the bottom and is divided into four tiers of holes 64A to 64D is provided below the slit 63 in the base 62. From the top, the third die 73 is fitted into the first tier hole 64A, the second die 72 is fitted into the second tier hole 64B and overlapped on the bottom surface of the third die 73, and the first die 71 is fitted into the third tier hole 64C and overlapped on the bottom surface of the second die 72 and fixed to the base 62.

[0033] An elliptical third punch insertion hole 73A corresponding to the outer shape of the lower part of the third punch 53 penetrates the third die 73 from top to bottom. The opening edge of the third punch insertion hole 73A in the upper surface of the third die 73 is a horizontal surface, and around the horizontal surface, there is provided an inclined surface 73C that gradually descends as it moves away from the third punch insertion hole 73A to the side.

[0034] A rectangular second punch insertion hole 72A corresponding to the outer shape of the punch body 52B of the second punch 52 penetrates the second die 72 from top to bottom. A portion of the top surface of the second die 72 surrounding the second punch insertion hole 72A is exposed inside a third punch insertion hole 73A of the third die 73, and a corner where the top surface of the second die 72 and the second punch insertion hole 72A intersect is chamfered into an arc shape.

[0035] A rectangular first punch insertion hole 71A corresponding to the outer shape of the punch body 51B of the first punch 51 penetrates the first die 71 from top to bottom. A portion of the top surface of the first die 71 surrounding the first punch insertion hole 71A is exposed inside a second punch insertion hole 72A of the second die 72, and a corner where the top surface of the first die 71 and the first punch insertion hole 71A intersect is chamfered into an arc shape.

[0036] A recess is formed on the upper surface of the slit 63 of the die holder 60, and a plate holder 74 is fitted and fixed therein. The lower portion of the plate holder 74 protrudes from the upper surface of the slit 63 and faces the upper surface of the third die 73 with a gap therebetween. A through hole 74A having substantially the same shape as the third punch insertion hole 73A of the third die 73 penetrates the plate holder 74 from top to bottom. Furthermore, a through hole 60A slightly larger than the through hole 74A is formed in the portion of the die holder 60 above the plate holder 74.

[0037] 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 in synchronization with the rotation of the drive shaft 16, and feeds a predetermined amount of sheet metal toward the slit 63 each time the drive shaft 16 rotates once.

[0038] As shown in Fig. 1, a pair of supporting opposing walls 11 of the supporting frame 15 has a window 11A opening at a position facing the die holder 60 in the horizontal direction H1. A work transport device (not shown) passes through the pair of windows 11A and the work transport space 61 (see Fig. 5). The work transport device includes, for example, a slide base that is reciprocated in the horizontal direction H1 by a ball screw mechanism, and a pair of fingers that extend in a cantilevered state to the right from the slide base and face each other in the front-rear direction H2. The pair of fingers open and close to and away from each other, and are biased toward each other.

[0039] In addition, the sheet metal feeding device and the workpiece transporting device may be provided with a motor as a drive source separate from the motor that drives the drive shaft 16, or may receive power from the motor that drives the drive shaft 16.

[0040] This concludes the description of the configuration of the press machine 10 of this embodiment. With this press machine 10, a container-shaped workpiece 92 with a bottom at one end is formed from a metal sheet 90 in the following manner.

[0041] That is, when the press machine 10 is started and the drive shaft 16 is driven to rotate, the sheet metal 90 is fed from the sheet metal feeder to between the third die 73 and the plate presser 74 of the die holder 60, as shown in Fig. 5. Then, the third punch 53 descends in a state in which the punch body 52B of the second punch 52 is received in the lower surface recess 53B of the third punch 53 and the punch body 51B of the first punch 51 is received in the lower surface recess 52C of the punch body 52B, and an elliptical blank 91 is punched out of the sheet metal 90, as shown in Fig. 6.

[0042] Then, the third punch 53 reaches the bottom dead center, and the blank material 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 further descend, and the blank material 91 is forced into the second punch insertion hole 72A of the second die 72 and formed into a workpiece 92 having a generally rectangular parallelepiped shape with an open upper surface, as shown in FIG 7A.

[0043] Then, after the second punch 52 reaches the bottom dead point and the lower end of the second punch 52 reaches the upper surface of the first die 71, the first punch 51 further descends and the workpiece 92 is forced into the first punch insertion hole 71A and squeezed or ironed as shown in Fig. 7B. Then, when the workpiece 92 is pressed against the lower surface in the workpiece conveying space 61 below the stand portion 62, the first punch 51 reaches the bottom dead point.

[0044] At this time, a pair of fingers of the work transport device waits below the first punch insertion hole 71A, and the work 92 is pushed between the pair of fingers from above. In addition, the opposing surfaces of the pair of fingers (in other words, the surfaces of the fingers facing the first punch 51 side) are provided with locking parts that lock onto the upper surface of the work 92, and this causes the work 92 to be released from the first punch 51 that passes through the bottom dead center and rises. Then, the work transport device transports the work 92 to the outside of the right window part 11A, where, for example, a guide not shown slides against the pair of fingers to open the pair of fingers, and the work 92 is accommodated in the lower accommodation box. Then, the pair of fingers return to a position below the stand part 62. The press machine 10 repeats the above-mentioned operation (i.e., the cycle operation), and a plurality of workpieces 92 are formed.

[0045] According to the press machine 10 of this embodiment, the following effects are achieved. That is, as described above, the press machine 10 of this embodiment is provided with a common drive shaft 16 for the first to third sliders 21, 22, 23 to which the punches 51, 52, 53 are fixed, respectively. Then, the rotation of the drive shaft 16 is converted into the sliding motion of the first to third sliders 21, 22, 23 by the first to third conversion mechanisms 1, 2, 3, so that the rigidity of the power transmission system of the multiple punches is higher than that of the conventional one using air in the power transmission system, and it is possible to stabilize the processing quality of the workpiece more than before. Here, the second conversion mechanism 2 forms a pair of crank mechanisms sandwiching the first conversion mechanism 1 between them in the horizontal direction H1. In order to receive the force from the drive shaft 16 via the pair of links 24 of the pair of crank mechanisms, the second slider 22 has a structure in which a pair of box walls 22B protrude from the front surface of the second slide plate 22A, and the pair of links 24 are supported by a pair of pivot supports 22D on the upper surfaces of the pair of box walls 22B. This allows the second slider 22 to be lightweight yet have high strength. The first slider 21 has a rectangular column shape extending in the vertical direction H3, is received between the pair of box walls 22B, and includes a first slide rod 21A slidably supported by the second slider 22, so that the first and second sliders 21 and 22 are compactly assembled.

[0046] In addition, the press machine 10 of this embodiment presses the workpiece three times in one cycle operation, which is more than the conventional press machine. As a result, when the press machine 10 of this embodiment is used to press the workpiece three times, an additional press machine is not required compared to the conventional press machine. When the press machine 10 of this embodiment is used to press the workpiece four or more times, the additional press machine can be made smaller than the conventional press machine. In addition, in the press machine 10 of this embodiment, the first slide rod 21A, the second slide plate 22A, and the third slide plate 23A are stacked in front of the back support wall 14 that is inserted between a pair of support opposing walls 11 that rotatably support the drive shaft 16, so that the first to third sliders 21, 22, and 23 equipped with them can be stored compactly.

[0047] The pair of third conversion mechanisms 3 are cam mechanisms equipped with a pair of circular cams 40 eccentric to the drive shaft 16, and two pairs of rollers 23R rotatably supported on two pairs of vertical ribs 23B, 23C protruding forward from the portion of the third slide plate 23A that protrudes on both sides of the second slide plate 22A are adapted to abut on the pair of cams 40 from above and below. The pair of vertical ribs 23B extend to the lower end of the third slide plate 23A and face the pair of box walls 22B in the horizontal direction H1, so that the third slide plate 23A can be reinforced by the vertical ribs 23B supporting the rollers 23R.

[0048] The first conversion mechanism 1 is a cam mechanism including a descending cam 43 for pushing down the first slide rod 21A and a rising cam 44 for pulling up the first slide rod 21A. The first slider 21 is configured such that the cage portion 25, which is formed by connecting the upper ends and the lower ends of a pair of frame portions 25F that face each other across the descending cam 43 and through which the drive shaft 16 penetrates, by connecting walls 25X and 25Y, respectively, and is fixed to the upper end of the first slide rod 21A, and the rollers 21R and 25R rotatably supported by the cage portion 25 abut against the descending cam 43 and the rising cam 44, thereby making it possible to reduce the size of the first slider 21.

[0049] [Second embodiment] 8 shows an embodiment of a container molding system 89 according to the present disclosure. This container molding system 89 includes the press machine 10 described in the first embodiment and a transfer press machine 80 disposed immediately to the right thereof. A plurality of punches 82 are attached to a ram 81 of the transfer press machine 80 and arranged at equal intervals in the horizontal direction H1, and below the ram 81, a plurality of die holders 83 are arranged which hold a plurality of dies (not shown) corresponding to the plurality of punches 82.

[0050] The transfer device 85 of the transfer press 80 is provided with a pair of rails 85R that are disposed above the die holders 83, extend in the lateral direction H1, and face each other in the front-rear direction H2, and a plurality of pairs of fingers 85F that are supported movably in the lateral direction H2 relative to the pair of rails 85R and face each other in the lateral direction H2. The fingers 85F of each pair are biased toward each other. The distance between the fingers 85F in the lateral direction H1 is the same as the distance between the punches 82.

[0051] A pair of opposing support walls 80S of the support frame 80F of the transfer press 80 is provided with through-windows (not shown) penetrating in the horizontal direction H1. A pair of rails 85R penetrate the through-windows in the right-side opposing support wall 80S, and a drive mechanism (not shown) for reciprocating the pair of rails 85R in the horizontal direction H1 is provided on the outer surface of the right-side opposing support wall 80S.

[0052] In the container molding system 89 of this embodiment, the press machine 10 and the transfer press machine 80 operate in the same cycle, and a pair of fingers of the work transport device of the press machine 10 described above transports a work 92 to a processing stage below the leftmost punch 82 of the transfer press machine 80. Then, before the press machine 10 molds the next work 92, the ram 81 of the transfer press machine 80 moves to the bottom dead center, and the leftmost punch 82 pushes the work 92 into the punch insertion hole of the die, thereby releasing the work 92 from the pair of fingers of the work transport device.

[0053] Then, before the press machine 10 completes forming the next workpiece 92, a pair of fingers of the workpiece transporting device returns to a position below the first punch insertion hole 71A of the press machine 10 and waits, and before each punch 82 of the transfer press machine 80 exits from the punch insertion hole, each pair of fingers 85F of the transfer device 85 moves to the left end of the reciprocating stroke and waits above each punch insertion hole.

[0054] Then, at approximately the same time that the first punch 51 of the press 10 reaches the bottom dead point, each punch 82 of the transfer press 80 exits from each punch insertion hole, and the work 92 is transferred from the first punch 51 to a pair of fingers of the work transport device, and the work 92 is transferred from the leftmost punch 82 to the leftmost finger 85F of the transfer device 85. Then, as described above, the pair of fingers of the work transport device transport a new work 92 to below the leftmost punch 82, and the leftmost finger 85F moves to the right end of the reciprocating stroke to move the work 92 below the second punch 82 from the left.

[0055] By repeating the above operations, the workpiece 92, which has a container shape with a bottom at one end formed by the press machine 10, is drawn or ironed a number of times by the transfer press machine 80, and is formed into a workpiece 92 which is longer and thinner in shape than the workpiece 92 immediately after being formed by the press machine 10. Then, the workpiece 92 which has finished being formed by the transfer press machine 80 is discharged downward from the transfer device 85 outside the support facing wall 80S on the right side of the transfer press machine 80, and is stored in a storage box (not shown).

[0056] [Other embodiments] In the first embodiment, the first and third conversion mechanisms 1, 3 are cam mechanisms, but either or both of the first and third conversion mechanisms 1, 3 may be crank mechanisms. In this case, for example, the third slider 23 may also be provided with a pair of box walls similar to those of the second slider 22, and a link may be connected to the upper pivot supports thereof. In addition, when a cam mechanism is used, it may be circular like the above-mentioned cam 40, or may be a non-circular pair of cams like the cams 43, 44.

[0057] The planar shape of the workpiece 92 formed by the press machine 10 of the first embodiment is rectangular, but is not limited to this and may be circular, a polygon other than rectangular, or an irregular shape.

[0058] In the press machine 10 of the first embodiment, the third punch 53 punches out the blank 91 from the sheet metal 90, and the first and second punches 51, 52 draw the blank 91, but as long as the first to third punches 51, 52, 53 perform processing at different timings in one cycle operation, the processing by the first to third punches 51, 52, 53 is not limited to that of the first embodiment. For example, the first punch 51 may bore a through hole in the bottom of the workpiece 92 drawn by the second punch 52, or a workpiece previously formed into a container shape may be drawn or ironed three times by the first to third punches 51, 52, 53.

[0059] <Additional Notes> The following describes the feature groups extracted from the above-described embodiments, while indicating their effects, etc., as necessary. Note that, in the following, for ease of understanding, the corresponding configurations in the above-described embodiments are appropriately indicated in parentheses, but these feature groups are not limited to the specific configurations indicated in parentheses.

[0060] [Feature 1] The present invention relates to a first slider (21, 22) that is supported so as to be slidable in a vertical direction (H3) and has punches (51, 52) fixed thereto, a drive shaft (16) that is provided in common with the first and second sliders (21, 22) and is driven to rotate about a rotation axis (J1) extending in a horizontal direction (H1), and a rotary shaft (J2) that is disposed at an intermediate position of the drive shaft (16) in the horizontal direction (H1) and controls the rotation of the drive shaft (16) by the first slider ( a pair of second conversion mechanisms (2) disposed at two positions sandwiching the first conversion mechanism (1) in the horizontal direction (H1) to convert the rotation of the drive shaft (16) into a reciprocating sliding motion of the second slider (22) and having a bottom dead center different from that of the first conversion mechanism (1), a second slide plate (22A) having a plate shape with a main plane facing a vertical direction (H2) and disposed below and to the rear of the drive shaft (16), and a pair of box walls (22B) projecting from a front surface of the second slide plate (22A) and facing each other in the horizontal direction (H1), the first slider (21) having a prismatic shape extending in a vertical direction (H3) and received between the pair of box walls (22B) and configured to support the second slider (22 ), the pair of second conversion mechanisms (2) are crank mechanisms comprising a pair of crank portions (42) formed on the drive shaft (16), a pair of journal portions (22D) provided on upper surfaces of the pair of box walls (22B), and a pair of links (24) rotatably supported at both ends by the pair of crank portions (42) and the pair of journal portions (22D).

[0061] [Feature 2] a third slider (23) that is supported slidably in the vertical direction (H3), has a punch (53) fixed thereto, and shares the drive shaft (16) with the first and second slides (21, 22); a pair of third conversion mechanisms (3) that are disposed at two positions sandwiching the pair of second conversion mechanisms (2) in the horizontal direction (H1), convert the rotation of the drive shaft (16) into a reciprocating sliding motion of the third slider (23) and have a bottom dead center different from that of the first conversion mechanism (1) and the pair of second conversion mechanisms (2); and a pair of supporting opposing walls (11) that face each other in the horizontal direction (H1) and rotatably support the drive shaft (16), a rear support wall (14) located rearward of the drive shaft (16) in the front-rear direction (H2) and extending between the pair of opposing support walls (11); and a third slide plate (23A) included in the third slider (23), having a plate shape with a main plane facing the front-rear direction (H2), disposed between the rear support wall (14) and the drive shaft (16), and slidably supported by the rear support wall (14), wherein the second slide plate (22A) is overlapped on a front surface of the third slide plate (23A) and slidably supported by the third slide plate (23A).

[0062] [Feature 3] The pair of third conversion mechanisms (3) are cam mechanisms including a pair of circular cams (40) eccentric with respect to the drive shaft (16). The third slider (23) includes two pairs of vertical ribs (23B, 23C) that protrude forward from a portion of the third slide plate (23A) that protrudes on both sides of the second slide plate (22A) and extend in the up-down direction, and recesses (23D, 23E) that are formed in the two pairs of vertical ribs (23B, 23C) and that receive the drive shaft (16). ), and two pairs of rollers (23R) that are sandwiched in the horizontal direction (H1) by adjacent pairs of vertical ribs (23B, 23C) among the two pairs of vertical ribs (23B, 23C) and rotatably supported and abut the pair of cams (40) from above and below, wherein at least one of the pairs of vertical ribs (23B, 23C) extends to a lower end of the third slide plate (23A) and faces the pair of box walls (22B) in the horizontal direction (H1).

[0063] [Feature 4] The press machine (10) according to feature 2 or 3, wherein the first conversion mechanism (1) is a cam mechanism including a descending cam (43) for pushing down the first slide rod (21A) and an ascent cam (44) for pulling up the first slide rod (21A), and the first slider (21) includes: a cage portion (25) formed by connecting upper ends and lower ends of a pair of frame portions (25F) that face each other across the descending cam (43) and through which the drive shaft (16) penetrates, respectively, with connecting walls (25X, 25Y) and fixed to the upper end of the first slide rod (21A); a descending roller (21R) that is rotatably supported at the lower end of the cage portion (25) and abuts against the descending cam (43) from below; and a rising roller (25R) that is rotatably supported on an upper portion of a side surface of the cage portion (25) and abuts against the ascent cam (44) from above.

[0064] [Feature 5] The punch (51) is fixed to the first slider (21), a cylindrical second punch (52) is fixed to the second slider (22) and is fitted to the outside of the first punch (51), a cylindrical third punch (53) is fixed to the third slider (23) and is fitted to the outside of the second punch (52), a third die (73) having a third punch insertion hole (73A) into which the third punch (53) is inserted and configured to punch out a blank (91) from a sheet metal (90) in cooperation with the third punch (53), and a second die (72) disposed below the second die (72), having a second punch insertion hole (72A) through which the second punch (52) enters, and configured to draw-form a container-shaped workpiece (92) with a bottom at one end from the blank material (91); and a first die (71) disposed below the second die (72), having a first punch insertion hole (71A) through which the first punch (51) enters, and configured to draw, iron, or punch the workpiece (92).

[0065] [Feature 6] The press (10) according to feature 5, wherein the third punch (53) and the third punch insertion hole (73A) are elliptical, oval, or rectangular with four sides bulging outward, the second punch (52) and the second punch insertion hole (72A) are rectangular and 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 rectangular and smaller than the second punch (52) and the second punch insertion hole (72A).

[0066] [Feature 7] A container molding system (89) comprising: a transfer press machine (80); and a press machine (10) according to feature 6 that supplies the container-shaped workpiece (92) to a transfer device (85) of the transfer press machine (80), wherein the transfer press machine (80) draws and molds the workpiece (92) molded by the press machine (10) a plurality of times.

[0067] The press machine of feature 1 is provided with a common drive shaft for the first and second sliders to which the punches are respectively fixed. The rotation of the drive shaft is converted into the sliding motion of the first and second sliders by the first conversion mechanism and the second conversion mechanism, so that the rigidity of the power transmission system of the multiple punches is higher than that of a conventional power transmission system that uses air, and the processing quality of the workpiece can be more stable than before. Here, the second conversion mechanism is a pair of crank mechanisms sandwiching the first conversion mechanism in the horizontal direction. The second slider has a special structure in order to receive the force from the drive shaft through a pair of links of the pair of crank mechanisms. That is, the second slider has a structure in which a pair of box walls protrude from the front surface of the second slide plate, and a pair of links are supported by a pair of pivots on the upper surfaces of the pair of box walls. This allows the second slider to be lightweight yet have high strength. In addition, the first slider is shaped like a rectangular column extending in the vertical direction, is received between a pair of box walls, and is provided with a first slide rod slidably supported by the second slider, so that the first and second sliders are compactly arranged.

[0068] The press machine of feature 2 includes first to third sliders that share a drive shaft. That is, the number of times that the workpiece is pressed in one cycle operation is three times, which is more than the conventional number. As a result, when the workpiece is pressed three times, the press machine of feature 2 does not require an additional press machine compared to the conventional number. Furthermore, when the workpiece is pressed four or more times, the press machine of feature 2 can make the additional press machine smaller compared to the conventional number. Furthermore, in the press machine of feature 2, the first slide rod, the second slide plate, and the third slide plate are stacked in front of the back support wall that is inserted between a pair of opposing support walls that rotatably support the drive shaft, so that the first to third sliders that include them can be stored compactly.

[0069] In addition, in the press machine of feature 3, the pair of third conversion mechanisms form a cam mechanism equipped with a pair of circular cams eccentric to the drive shaft, and two pairs of rollers rotatably supported on two pairs of vertical ribs protruding forward from a portion of the third slide plate that protrudes on both sides of the second slide plate are configured to abut against the pair of cams from above and below. The pair of vertical ribs extend to the lower end of the third slide plate and are configured to laterally face the pair of box walls, so that the third slide plate can be reinforced by the vertical ribs that support the rollers.

[0070] In the press machine of feature 4, the first conversion mechanism is a cam mechanism equipped with a descending cam for pushing down the first slide rod and an ascending cam for pulling up the first slide rod. The first slider includes a cage portion fixed to the upper end of the first slide rod, the cage portion being formed by connecting upper ends and lower ends of a pair of frame portions that face each other across the descending cam and through which the drive shaft penetrates, with connecting walls, and the descending roller and ascending roller rotatably supported by the cage portion are configured to abut against the descending cam and the ascending cam, so that the first slider can be made compact.

[0071] According to the press machine of feature 5, in one cycle operation, a blank material punched out from a metal sheet by the cylindrical third punch and third die fixed to the third slider is drawn into a container-shaped workpiece with a bottom at one end by the cylindrical second punch and second die fixed to the second slider, and this container-shaped workpiece with a bottom at one end is further drawn, ironed, or punched by the first punch and first die fixed to the first slider.

[0072] According to the press machine of feature 6, a container-shaped workpiece having a rectangular planar cross-sectional shape and a bottom at one end can be formed in one cycle operation.

[0073] In the container forming system of Feature 7, the workpiece formed by the press machine of Feature 6 above can be drawn by a transfer press machine to be further formed into a long, thin, rectangular container-shaped workpiece.

[0074] In addition, although this specification and drawings disclose specific examples of the technology included in the scope of the claims, the technology described in the claims is not limited to these specific examples, but includes various modifications and variations of the specific examples, as well as parts of the specific examples taken alone. [Explanation of symbols]

[0075] 1. First conversion mechanism 2. Second conversion mechanism 3. The third conversion mechanism 10 Press machine 11 Support opposing wall 14 Rear support wall 16 Drive shaft 21 First Slider 21A First slide rod 21R roller (descent roller) 22 Second Slider 22A Second slide plate 22B Box Wall 23 Third Slider 23A 3rd slide plate 23B, 23C Vertical ribs 23D, 23E Recess 23R Lola 24 Links 25 Cage 25F frame 25R roller (ascending roller) 25X, 25Y Connecting wall 40 Cam 42 Crank section 43 Descent Cam 44 Ascending cam 51 First Punch 52 Second Punch 53 Third punch 71 First Die 71A First punch hole 72 2nd Die 72A 2nd punch insertion hole 73 Third Die 73A 3rd punch insertion hole 80 Transfer Press Machine 85 Transfer Device 89 Container molding system 90 Sheet Metal 91 Blank material 92 Work H1 Horizontal H2 Anteroposterior direction H3 Vertical direction J1 Rotational Axis

Claims

1. a first slider and a second slider, each of which has a punch fixed thereto, supported so as to be slidable in the vertical direction; a drive shaft provided in common with the first and second sliders and rotatably driven about a rotation axis extending in a lateral direction; a first conversion mechanism disposed at a middle position of the drive shaft in the lateral direction and configured to convert rotation of the drive shaft into a reciprocating sliding motion of the first slider; 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 bottom dead center different from that of the first conversion mechanism, the second slider is plate-shaped and has a main plane facing a front-rear direction perpendicular to the lateral direction, and includes a second slide plate disposed below and rearward of the drive shaft, and a pair of box walls protruding from a front surface of the second slide plate and facing each other in the lateral direction; the first slider has a rectangular column shape extending in the vertical direction, is received between the pair of box walls, and includes a first slide rod slidably supported by the second slider; The pair of second conversion mechanisms are crank mechanisms, and include a pair of crank portions formed on the drive shaft, a pair of support portions provided on the upper surfaces of the pair of box walls, and a pair of links whose both ends are rotatably supported by the pair of crank portions and the pair of support portions.

2. a third slider that is supported so as to be slidable in the vertical direction, has a punch fixed thereto, and shares the drive shaft with the first and second sliders; a pair of third conversion mechanisms that are arranged at two positions sandwiching the pair of second conversion mechanisms in the lateral direction, converting the rotation of the drive shaft into a reciprocating sliding motion of the third slider, and have a bottom dead center different from that of the first conversion mechanism and the pair of second conversion mechanisms; a pair of opposing support walls opposed to each other in the lateral direction and each supporting the drive shaft rotatably; a rear support wall located rearward of the drive shaft in the front-rear direction and extending between the pair of opposing support walls; a third slide plate that is included in the third slider, has a plate shape with a main plane facing the front-rear direction, is disposed between the rear support wall and the drive shaft, and is slidably supported by the rear support wall; The press machine according to claim 1 , wherein the second slide plate is overlapped on a front surface of the third slide plate and slidably supported by the third slide plate.

3. the pair of third conversion mechanisms are cam mechanisms including a pair of circular cams eccentric to the drive shaft; The third slider includes: two pairs of vertical ribs protruding forward from portions of the third slide plate that protrude toward both sides of the second slide plate and extending in the up-down direction; a recess formed in each of the two pairs of longitudinal ribs for receiving the drive shaft; two pairs of rollers that are rotatably supported by being sandwiched between adjacent pairs of the vertical ribs in the horizontal direction and that abut against the pair of cams from above and below; 3. The press according to claim 2, wherein at least one of the pair of vertical ribs extends to a lower end of the third slide plate and faces the pair of box walls in the lateral direction.

4. the first conversion mechanism is a cam mechanism including a lowering cam for pushing down the first slide rod and a lifting cam for lifting up the first slide rod, The first slider includes: a cage portion formed by connecting upper ends and lower ends of a pair of frame portions that face each other across the descent cam and through which the drive shaft penetrates, with connecting walls, and fixed to the upper end of the first slide rod; 3. The press machine according to claim 2, further comprising: a descending roller rotatably supported on a lower end of the cage portion and abutting against the descending cam from below; and a lifting roller rotatably supported on an upper portion of a side surface of the cage portion and abutting against the lifting cam from above.

5. a first punch fixed to the first slider; a cylindrical second punch fixed to the second slider and fitted to the outside of the first punch; a cylindrical third punch fixed to the third slider and fitted to the outside of the second punch; a third die having a third punch insertion hole into which the third punch is inserted and configured to cooperate with the third punch to punch out a blank from a sheet metal; a second die disposed under the third die, having a second punch insertion hole into which the second punch is inserted, and configured to draw-form a container-shaped workpiece having a bottom at one end from the blank; a first die disposed under the second die, having a first punch insertion hole into which the first punch is inserted, and configured to draw, iron, or punch the workpiece.

6. the third punch and the third punch insertion hole are elliptical, oval, or rectangular having four sides that bulge outward; the second punch and the second punch insertion hole are rectangular and smaller than the third punch and the third punch insertion hole; 6. The press machine according to claim 5, wherein the first punch and the first punch insertion hole are rectangular and smaller than the second punch and the second punch insertion hole.

7. Transfer press machine, and a press machine according to claim 6 for supplying the container-shaped workpiece to a transfer device of the transfer press machine, A container molding system in which the transfer press machine draws and molds the workpiece formed by the press machine multiple times.

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