CN116583360A

CN116583360A - Die supporting mechanism, cylindrical workpiece generating device, and multi-station punching machine

Info

Publication number: CN116583360A
Application number: CN202180084400.3A
Authority: CN
Inventors: 矢野正裕; 服部大辅
Original assignee: Asahi Seiki Manufacturing Co Ltd
Current assignee: Asahi Seiki Manufacturing Co Ltd
Priority date: 2021-02-12
Filing date: 2021-09-09
Publication date: 2023-08-11
Also published as: KR20230106179A; WO2022172496A1; JP2022123353A; JP6866056B1; EP4260959A1; US20240066582A1; EP4260959A4

Abstract

The invention provides a technique for preventing the defect that a punching punch presses against the opening edge of a punching hole. A die supporting mechanism (40) of the present invention is provided with a die holding member (41) having a slit (41S) penetrating therethrough, wherein a die holding base (42) for holding a punching die (32) is formed at a position on the lower side of the slit (41S) in the die holding member (41), and a top plate portion (43) having a top plate hole (44) concentric with a punching hole (32A) of the punching die (32) is formed at a position on the upper side of the slit (41S). The die holding member (41) is supported by the support base (50) so as to be slidable in the horizontal direction, and the guide portion of the top plate hole (44) is in sliding contact with the punching punch (31), so that the die holding member (41) slides to a position where the punching hole (32A) and the punching punch (31) are centered.

Description

Die supporting mechanism, cylindrical workpiece generating device, and multi-station punching machine

Technical Field

The present invention relates to a die supporting mechanism, a cylindrical workpiece generating device for forming a cylindrical workpiece, and a multi-station press for drawing and ironing the cylindrical workpiece.

Background

As a die supporting mechanism, a die supporting mechanism for supporting a punching die for punching a blank from a metal plate is known (for example, refer to patent document 1).

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication 2016-203212 (FIG. 1)

Disclosure of Invention

Problems to be solved by the invention

However, the above-described die supporting mechanism or the supporting portion of the corresponding punching punch is provided with a position adjusting mechanism, and centering adjustment is performed to match the center of the punching punch with the center of the punching hole before continuous operation of continuously punching the material. However, in continuous operation, the center of the punching punch and the center of the punching hole gradually shift due to some reasons such as thermal deformation, and there are cases where the punching punch is pressed against the opening edge of the punching hole, and development of a technique for suppressing such occurrence of defects has been attempted.

Means for solving the problems

In order to solve the above problems, a die supporting mechanism according to one aspect includes a die holding member having a slit extending horizontally therethrough, wherein a die holding base for holding a punching die having a punching hole is formed in a portion of the die holding member located below the slit, a top plate portion having a top plate hole concentric with the punching hole is formed in a portion of the die holding member located above the slit, a part of a metal plate inserted into the slit is punched into a blank by a punching punch lowered into the punching hole through the top plate hole, and the top plate portion separates the metal plate from the raised punching punch, and the die supporting mechanism includes: a support base that supports the die holding member so as to be slidable in a horizontal direction; and a guide portion formed on an inner surface of the top plate hole and in sliding contact with the punching punch to slide the die holding member to a position where the punching hole and the punching punch are centered.

Drawings

Fig. 1 is a front view of a multi-station press machine according to a first embodiment of the present invention.

Fig. 2 is a side sectional view of the cylindrical work generating device.

Fig. 3 is a perspective view of the cylindrical work generating apparatus.

Fig. 4 is a front sectional view of the state in which the blanking punch is separated from the die holding member.

Fig. 5 is an exploded perspective view of the die supporting mechanism.

Fig. 6 is a front cross-sectional view of the cylindrical work generating device in a state where the die holding member is locked.

Fig. 7 is an enlarged partial front cross-sectional view of the blanking punch and the top plate hole.

Fig. 8 is an enlarged partial front cross-sectional view of the blanking punch immediately before blanking the blank.

Fig. 9 is an enlarged partial front cross-sectional view of the blanking punch and the top plate hole after blanking the blank.

Fig. 10 is a front cross-sectional view of the cylindrical work generating device of the second embodiment.

Detailed Description

First embodiment

Hereinafter, a multi-station press machine 10 according to a first embodiment of the present invention will be described with reference to fig. 1 to 9. As shown in fig. 1, the multi-station press 10 includes a plurality of punches (see reference numerals 31, 25, and 25X in fig. 1) arranged in a row in the lateral direction at the lower end portion of the ram 12 supported to be able to move up and down by the support frame 11. Hereinafter, the arrangement direction of the plurality of punches is referred to as "lateral direction H1", and the horizontal direction orthogonal thereto is referred to as "front-rear direction H2". In addition, one side of the multi-station press 10 shown in fig. 1 is referred to as a "front side", the opposite side thereof is referred to as a "rear side", and the right side when the multi-station press 10 is viewed from the front side is simply referred to as a "right side", and the opposite side thereof is simply referred to as a "left side".

The left end portion of the plurality of punches of the lower end portion of the ram 12 is a blanking punch 31, and as shown in fig. 4, is cylindrical, and houses the lower end portion of a drawing punch 35 therein. The blanking punch 31 and the drawing punch 35 constitute a part of the cylindrical workpiece generating device 30 included in the multi-stage press 10, and as shown in fig. 9, the blanking punch 31 blanks a blank W2 from the metal plate W1, and as shown in fig. 2, the drawing punch 35 forms the blank W2 into a cylindrical workpiece W3. That is, the cylindrical work W3 is generated from the metal plate W1 by the cylindrical work generating device 30.

As shown in fig. 1, the punches other than the left end and the right end of the ram 12 are additional punches 25, and a plurality of additional dies 26 corresponding to the additional punches 25 are disposed in the support block 24 below the ram 12. Then, each additional punch 25 presses the cylindrical workpiece W3 into a shaping hole, not shown, of each additional die 26, and performs drawing or ironing. The cylindrical workpiece W3 pressed into each of the forming holes is pressed upward of the forming hole while being sandwiched between a not-shown ejector pin and the additional work punch 25, and is released from the additional work punch 25 by a cylindrical workpiece stripper 25S fitted in each of the additional work punches 25. Then, the cylindrical workpiece W3 above each of the forming holes is conveyed upward of the forming hole adjacent to each of the right by the conveyor 18. By repeating this operation, the cylindrical workpiece W3 is subjected to the additional work by the plurality of additional work punches 25 and the additional work dies 26 a plurality of times. The punch at the right end of the ram 12 is a blanking punch 25X, and the cylindrical workpiece W3 conveyed by the conveyor 18 is blanked off to a discharge path, not shown. The cylindrical workpiece W3 falling to the discharge path is collected in a collection box not shown.

The conveyor 18 has the following structure as shown in fig. 2: the plurality of pairs of fingers 20 facing each other in the front-rear direction H2 are supported so as to be able to approach and separate from each other on a pair of support rails 19 extending in the lateral direction H1, and are biased to the side where the fingers 20 approach each other by a coil spring, not shown. The plurality of pairs of fingers 20 hold the cylindrical workpiece W3, move from the respective additional dies 26 to the adjacent additional dies 26 on the right, and deliver the cylindrical workpiece W3 to the additional punch 25, whereby the cylindrical workpiece W3 is intermittently conveyed to the right in the lateral direction H1.

The so-called dummy work table having no punch and die is formed between the punching punch 31 and the additional work punch 25 at the left end, and the cylindrical work W3 conveyed to the dummy work table by the conveyor 18 is temporarily held by sandwiching a not-shown ejector pin and the lower surface of the support base 50 from the up-down direction.

The ram 12, the conveyor 18, the plurality of ejector pins, and the plurality of work ejector 25S are driven by the same driving source. Specifically, as shown in fig. 1, an upper shaft 13 and a lower shaft 17 extending in the lateral direction H1 are rotatably supported at the upper and lower portions of the support frame 11, respectively, and a side shaft 14 extending in the up-down direction is rotatably supported at the left side of the support frame 11. The bevel gear 14G at the upper end of the side shaft 14 is gear-coupled to the bevel gear 14G at one end of the upper shaft 13, and the lower end of the side shaft 14 is gear-coupled to one end of the lower shaft 17 by a gear, not shown, incorporated in the gear case 17G, so that the upper shaft 13, the side shaft 14, and the lower shaft 17 are driven to rotate by a common drive source.

The ram 12 is lifted by receiving power from a pair of cams 13A integrally rotated with the upper shaft 13, and the plurality of ejector pins are lifted by receiving power from a plurality of cams not shown integrally rotated with the lower shaft 17. The plurality of work strippers 25S are raised and lowered by receiving power from a plurality of cams, not shown, of the lower shaft 17 by a link mechanism, not shown, disposed behind the support block 24. A cam 14A is also provided in the middle of the side shaft 14 so as to be rotatable integrally therewith. The cams 14A are accommodated between a pair of not-shown connecting rods bridging between one ends of the pair of support rails 19 and between positions near the one ends, whereby the pair of support rails 19 reciprocate in the lateral direction H1 in synchronization with the lifting operation of the ram 12. The ram 12, the conveyor 18, the plurality of ejector pins, and the plurality of workpiece ejectors 25S may be driven by different driving sources, or may be driven by only other driving sources.

The configuration of the cylindrical work generating device 30 will be described in detail below. Fig. 3 shows a blanking punch 31, a drawing punch 35, and a die supporting mechanism 40 as main parts of the cylindrical workpiece generating device 30. As shown in fig. 2, the drawing punch 35 has a structure in which a columnar punch body 35B having a larger outer diameter than the shaft 35A having a circular cross section is fixed to the lower end thereof. The corners of the lower surface and the side surfaces of the punch body 35B are chamfered in an arc shape. In the present embodiment, the punch body 35B has a flat shape in the vertical direction, for example, but may not be flat.

As shown in fig. 3, the punching punch 31 includes, for example, an upper end cylindrical portion 31C, a first prismatic portion 31D, a second chamfered prismatic portion 31E, and a punch body portion 31F in this order from above (see fig. 4). The upper end cylindrical portion 31C protrudes from the center of the upper surface of the first prism portion 31D. The second chamfered prism portion 31E has a shape in which corners of the first prism portion 31D are chamfered to be wider than the chamfer width of the first prism portion 31D. The punch body 31F (see fig. 4) has a substantially cylindrical shape. The punching punch 31 may have a punch body 31F at a lower end thereof, and may have any shape above the punch body 31F, or may not have the upper end cylindrical portion 31C, the first prism portion 31D, and the second chamfered prism portion 31E.

Specifically, as shown in fig. 4, the punch body 31F has a slightly reduced diameter in a stepped shape at a position lower than the middle portion in the vertical direction, for example, so that a large diameter portion 31G is formed at the upper side, and a small diameter portion 31H is formed at the lower side. As shown in fig. 7, the step surface 31J between the large diameter portion 31G and the small diameter portion 31H has a cross-sectional shape of, for example, an arc shape of 1/4 of the same radius as the difference between the radii of the large diameter portion 31G and the small diameter portion 31H, and the upper end portion is continuous with the large diameter portion 31G. The corner of the lower surface 31K of the punching punch 31 and the side surface of the punch body 31F (i.e., the side surface of the small diameter portion 31H) is an edge portion 31L where both surfaces are perpendicular to each other in a sharp angle state. The step surface 31J is not limited to the circular arc shape having 1/4 of the radius equal to the difference between the radii of the large diameter portion 31G and the small diameter portion 31H, and may be circular arc shape having any size or tapered shape.

As shown in fig. 2, the punching punch 31 is formed in a tubular shape as described above, and has a small diameter hole 31A formed at an upper end portion and a large diameter hole 31B formed at the other upper end portion. The shaft portion 35A of the drawing punch 35 penetrates the small-diameter hole portion 31A so as to be capable of direct movement, and the punch body portion 35B of the drawing punch 35 is accommodated in the large-diameter hole portion 31B.

As shown in fig. 1, the punching punch 31 is fixed to the ram 12 and is lifted up and down together with the ram 12, and the opposing drawing punch 35 is lifted up and down by receiving power from, for example, a seesaw-type lever 16 rotatably supported by the support frame 11.

Specifically, one end of the rod 16 is hinged to the upper end of the drawing punch 35 so as to be movable in the lateral direction H1. A cam follower, not shown, protruding in the rotational axis direction is provided at the other end portion of the lever 16. The cam follower is engaged with a cam groove 15A on the outer peripheral surface of the cylinder 15 which rotates integrally with the side shaft 14. In an initial stage of the lowering of the blanking punch 31, for example, the punch body 35B of the drawing punch 35 is housed in the blanking punch 31, and after the blanking punch 31 reaches the bottom dead center, the punch body 35B of the drawing punch 35 is lowered downward from the blanking punch 31 and reaches the bottom dead center.

The blanking punch 31 and the drawing punch 35 of the present embodiment are each circular in cross section, but may be elliptical or oblong, and the cylindrical workpiece generating device 30 may be configured to generate an elliptical or oblong cylindrical workpiece. The drawing punch 35 may be operated by receiving power from a power source different from the ram 12.

As shown in fig. 3, the die supporting mechanism 40 is configured to support the die holding member 41 by the support base 50, for example. As shown in fig. 5, the die holding member 41 has a slit 41S penetrating in the front-rear direction H2, and for example, the punching die 32 and the drawing die 36 are held by a die holding base 42 located below the slit 41S, and a top plate portion 43 located above the slit 41S has a top plate hole 44 through which the punching punch 31 and the drawing punch 35 pass.

Specifically, the die holding base 42 has a rectangular plate shape having a horizontally long planar shape as a whole, and the top plate 43 has a rectangular plate shape having the same size as the die holding base 42 in the lateral direction H1 and smaller than the die holding base 42 in the front-rear direction H2, for example. Further, at both end edges of the lower surface of the top plate 43 in the lateral direction H1, for example, a pair of square-shaped protruding strips 43T having a square cross section and extending in the front-rear direction H2 are provided. For example, the top plate 43 is disposed at the center of the die holding base 42 in the front-rear direction H2, and the top plate 43 is fixed to the die holding base 42 by a plurality of bolts and a pair of pins 75 penetrating a pair of square protruding strips 43T vertically, and the slit 41S is formed between the upper surface of the die holding base 42 and the lower surface of the top plate 43. In place of the pair of square protrusions 43T of the top plate 43, a pair of square protrusions may be provided at both ends of the die holding base 42 in the lateral direction H1.

A thick portion 43U that is thickened in a stepped manner upward is formed at a central portion of the top plate portion 43 in the lateral direction H1, for example, and the top plate hole 44 penetrates the thick portion 43U vertically. The top plate hole 44 is circular in cross section, for example. As shown in fig. 7, for example, a tapered guide portion 44A that expands in diameter upward is formed at a position above the middle position in the vertical direction in the top plate hole 44, and a straight guide portion 44B that has the same inner diameter as the lower end of the tapered guide portion 44A and a uniform inner diameter (D4 in fig. 7) is formed at the lower side as a whole.

As shown in fig. 4, a die holding base 42 has a die receiving hole 46 formed coaxially with a top plate hole 44. The die receiving hole 46 is, for example, stepped and reduced in diameter at a middle position in the vertical direction, and a horizontal die supporting surface 46B is formed on a stepped surface thereof, and the punching die 32 and the drawing die 36 are fitted to a large diameter portion 46A above the die supporting surface 46B so that the drawing die 36 is positioned downward. The punching die 32 and the drawing die 36 are fixed to the die holding base 42 by a plurality of bolts, not shown, which penetrate the punching die and the drawing die in the vertical direction.

The drawing die 36 has a circular drawing hole 36A in the center thereof. The corner of the inner surface of the deep drawing hole 36A intersecting the horizontal upper surface 36B of the drawing die 36 is a rounded chamfer 36C. The inner diameter of the drawing hole 36A is smaller than the small diameter portion 46C of the die housing hole 46 below the die supporting surface 46B, for example.

The punching die 32 has, for example, a circular plate shape having the same outer diameter as the drawing die 36, and has a circular punching hole 32A larger than the drawing hole 36A in the center portion thereof. Then, the upper surface 36B of the drawing die 36 is exposed at the lower end of the punched hole 32A. Further, for example, the annular protrusion 32T protrudes stepwise from the opening edge of the punching hole 32A in the upper surface 32B of the punching die 32. The upper surface 32C of the annular projection 32T is horizontal, and an inclined surface 32D is provided between the upper surface 32C and the upper surface 32B. The upper surface 32C of the annular projection 32T and the corner of the inner surface of the punched hole 32A are, for example, edge portions 32L formed by the two surfaces being perpendicular to each other in a sharp angle state. The annular ridge 32T may not be provided.

As shown in fig. 5, a pair of upper surface grooves 42M extending in the front-rear direction H2 are formed in the upper surface of the die holding base 42, for example, at two positions sandwiched by a pair of square protruding bars 43T and the die receiving hole 46. Each upper surface groove 42M has a quadrangular cross section, and a pair of post through holes 42A penetrating the die holding base 42 vertically are formed at positions near both ends in the longitudinal direction of the bottom surface thereof, for example. For example, a notch 43A is formed in an edge of the top plate 43, and the notch 43A is used to avoid interference with a tool for fastening a bolt 70, which will be described later, that passes through the post through hole 42A.

A pair of pin holes 42P penetrating the die holding base 42 vertically are formed at both ends in the left-right direction in a portion of the die holding base 42 on the front side of the top plate 43, for example. Further, a part of the two pin holes 42P is disposed, for example, at a position in front of the slit 41S.

As shown in fig. 5, the support base 50 has a square groove structure accommodating groove 51 extending in the lateral direction H1 on the upper surface. As shown in fig. 3, the die holding base 42 is accommodated in the accommodation groove 51. As shown in fig. 5, for example, two pairs of 4 support posts 52 are provided to be received in the support post through holes 42A of the die holding base 42, standing from the bottom surface of the receiving groove 51. For example, a pair of beams 53 extending in the lateral direction H1, which are quadrangular in cross section, are overlapped and fixed on the upper surfaces of the pair of struts 52 facing each other in the front-rear direction H2.

Specifically, as shown in fig. 6, the support column 52 is fitted in a circular recess 55A formed in a cylindrical shape on the bottom surface of the accommodation groove 51, for example. For example, the female screw hole 55B penetrates the bottom center of the recess 55A vertically. Further, for example, spot facing holes 53Z are formed in two positions of the beam 53 which are positions immediately above the support posts 52, and the lower end portions of the bolts 70 whose heads are accommodated in the spot facing holes 53Z are fastened to the female screw holes 55B, so that the beam 53 is fixed to the accommodating groove 51 together with the support posts 52. Then, the die holding base 42 is held by the support base 50 via the beams 53 and the stay 52. The upper surfaces of the beams 53, the die holding base 42, and the support base 50 are arranged substantially coplanar with each other, for example, but one of the upper surfaces may be arranged higher than the other upper surface.

As shown in fig. 2 and 5, the support base 50 includes a through hole 54 that penetrates up and down along the same axis as the die receiving hole 46 of the die holding base 42. The through hole 54 is formed to have substantially the same inner diameter as the small diameter portion 46C of the lower end portion of the die housing hole 46, for example. The support base 50 includes one recess 54A facing in the front-rear direction H2 and opening into the inner surface of the through hole 54. The pair of workpiece strippers 60 are accommodated in the pair of recesses 54A, and the pair of workpiece strippers 60 are biased to the sides approaching each other.

As shown in fig. 5, for example, a pair of fixing holes 59 are provided at both ends of the support base 50 in the front-rear direction H2. As shown in fig. 2, the support base 50 is overlapped on the pair of base portions 24K fixed to the upper surface of the support block 24 and opposed to each other in the front-rear direction H2, and for example, a base fixing bolt 71 passing through the fixing hole 59 is fastened to the screw hole 24N of the base portion 24K and fixed. Thus, the entire support base 50 is kept in a state of being lifted from the upper surface of the support block 24, and the conveyor 18 described above is penetrated between the support base 50 and the support block 24.

As shown in fig. 4, when the ram 12 is positioned at the top dead center, the blanking punch 31 is disposed at a position separated above the top plate 43 together with the drawing punch 35. Then, in a state where the metal plate W1 passing through the slit 41S covers the punching hole 32A of the punching die 32, the punching punch 31 protrudes into the punching hole 32A through the top plate hole 44 of the top plate portion 43, and as shown in fig. 9, a part of the metal plate W1 is punched into a blank W2. Specifically, the metal plate W1 is cut into a circular shape by the edge portion 31L of the punching punch 31 and the edge portion 32L of the punching die 32, and the blank W2 is cut from the metal plate W1. The lower surface 31K of the blanking punch 31 reaches the bottom dead center when adjacent to the upper surface 36B of the drawing die 36. Thus, the outer edge of the blank W2 is sandwiched between the lower surface 31K of the punching punch 31 and the upper surface 36B of the drawing die 36.

The drawing punch 35 descends downward from the punching punch 31 with the outer edge portion of the blank W2 sandwiched between the punching punch 31 and the drawing die 36, presses the blank W2 into the drawing hole 36A, and forms a cylindrical workpiece W3 as shown in fig. 2.

The drawing punch 35 is then lowered below the support base 50 together with the cylindrical workpiece W3, passes between the pair of workpiece strippers 60, and reaches a bottom dead center when entering between the pair of fingers 20 at the left end portion of the conveyor 18 (see fig. 2). When the drawing punch 35 is raised, the cylindrical workpiece W3 is pulled away from the drawing punch 35 by the pair of workpiece strippers 60. For example, the blanking punch 31 is raised earlier than the drawing punch 35, and at this time, the metal plate W1 outside the blanking punch 31 is brought into contact with the top plate 43 and pulled away from the blanking punch 31. The punching punch 31 and the drawing punch 35 may be raised at any timing, and for example, the punching punch 31 and the drawing punch 35 may be raised at the same time after the drawing punch 35 reaches the bottom dead center.

As described above, the cylindrical workpiece W3 generated by the cylindrical workpiece generating device 30 and delivered to the pair of fingers 20 of the conveyor 18 is sequentially conveyed onto the plurality of additional work dies 26 via the dummy table, and is subjected to the additional work by the plurality of additional work punches 25 and the additional work dies 26 as described above.

Further, the operation of punching the blank W2 from the metal plate W1 by the punching punch 31 and the punching die 32 is smoothly performed if the central axis of the punching punch 31 coincides with the central axis of the punching hole 32A, but there are cases where the central axis of the punching punch 31 and the central axis of the punching hole 32A deviate beyond the allowable range during the continuous operation of the multi-stage press 10 for some reasons. In this way, the edge 31L of the punching punch 31 is in contact with the edge 32L of the opening edge of the punching hole 32A, and this causes a problem (hereinafter referred to as "distortion problem").

In order to prevent the distortion, the cylindrical workpiece generating device 30 is provided with, for example, a floating mechanism, a guide mechanism, a positioning and fixing mechanism, and an origin adjusting mechanism. The floating mechanism is a mechanism in which a gap is provided in a portion of the support base 50 where the die holding member 41 is held, and the support base 50 supports the die holding member 41 so as to be slidable in an arbitrary horizontal direction within the range of the gap. The guide mechanism is a mechanism that guides the die holding member 41 in such a manner that the die holding member 41 moves in a direction that the central axis of the punching hole 32A coincides with the central axis of the punching punch 31 by sliding contact of the die holding member 41 with the punching punch 31. The positioning and fixing mechanism is a mechanism for fixing the die holding member 41 to the origin position within the slidable range of the support base 50. The origin adjusting mechanism is a mechanism for adjusting the position of the support base 50 relative to the support block 24 so that the center axis of the punching punch 31 coincides with the center axial allowable range of the punching hole 32A in a state where the die holding member 41 is fixed to the origin position of the support base 50. The specific configuration of these mechanisms will be described below. The cylindrical workpiece generating device 30 may be configured to include only the floating mechanism and the guide mechanism, may be configured to include the floating mechanism, the guide mechanism position, and the fixing mechanism, or may be configured to include the floating mechanism, the guide mechanism position, and the origin adjusting mechanism, for example.

The positioning and fixing mechanism of the die supporting mechanism 40 of the present embodiment includes, for example, the pair of pin holes 42P of the die holding member 41 described above, the pair of pin holes 51P of the supporting base 50 provided immediately below the pin holes 42P, and the pair of positioning pins 72 shown in fig. 6. The positioning pins 72 are inserted into the pin holes 42P and 51P of the respective pairs arranged vertically, and the die holding member 41 is positioned two-dimensionally in the horizontal direction with respect to the support base 50. The located position is the origin position of the die holding member 41 with respect to the support base 50.

The upper portion of the positioning pin 72 is, for example, expanded in diameter in a step shape, is in contact with the opening edge of the pin hole 42P, and protrudes from the upper surface of the die holding base 42. As shown in fig. 3, the upper portions of the pair of positioning pins 72 are disposed at positions facing the slit 41S in the front-rear direction H2. Thus, in a state where the pair of positioning pins 72 are assembled, the metal plate W1 interferes with the positioning pins 72 when passing through the slit 41S, and the forgetting to pull out the positioning pins 72 can be noted. That is, the continuous operation of the multi-station press 10 is prevented from being started in a state where the die holding member 41 is fixed to the support base 50.

The positioning and fixing mechanism may be, for example, the following structure: alignment surfaces which are arranged up and down and are coplanar with each other when the die holding member 41 is arranged at the origin position of the support base 50 are provided at two portions of the die holding member 41 and at two portions of the support base 50, and common flat members are abutted and fixed to the alignment surfaces of the respective pairs, thereby fixing the die holding member 41 at the origin position of the support base 50.

As shown in fig. 6, the floating mechanism has the following structure: in a state where the die holding member 41 is positioned at the origin position of the support base 50, for example, a first gap δ1 of a predetermined size (for example, 0.5 to 2[ mm ]) or more is formed over the entire circumference between the outer peripheral surfaces of all the struts 52 and the inner peripheral surfaces of all the strut through holes 42A. That is, the difference between the radius of the outer peripheral surface of the strut 52 and the radius of the inner peripheral surface of the strut through hole 42A is equal to or greater than the predetermined size of the first gap δ1. In a state where the die holding member 41 is positioned at the origin position of the support base 50, for example, a gap of the first gap δ1 or more is formed between the beam 53 and the pair of inner side surfaces of the upper surface groove 42M and between the die holding member 41 and the pair of inner side surfaces of the accommodating groove 51. For example, a gap, not shown, is provided between the lower surface of the beam 53 and the bottom surface of the upper surface groove 42M, and the beam 53 does not press the die holding member 41 against the bottom surface of the accommodating groove 51. Thus, the die holding member 41 can slide in an arbitrary horizontal direction within the range of the first gap δ1 with respect to the support base 50 in a state where the pair of positioning pins 72 are removed.

In the present embodiment, the die holding member 41 is disposed at the center of the movable range with respect to the support base 50 at the origin position, but when the blanking punch 31 tends to be displaced to one side in a predetermined direction with respect to the blanking hole 32A during continuous operation of the multi-station press 10, it is preferable that the die holding member 41 is disposed at the center of the movable range with respect to the support base 50 at the origin position in response to this.

As an origin adjusting mechanism, as shown in fig. 2, the following structure is provided: for example, a gap having a size equal to or larger than the first gap δ1 is provided between the plurality of base fixing bolts 71 for fixing the support base 50 to the base portion 24K and the plurality of fixing holes 59 of the support base 50 through which the base fixing bolts 71 pass, and when all the base fixing bolts 71 are loosened, the support base 50 can slide, and the base fixing bolts 71 are tightened, thereby fixing the support base 50 to an arbitrary position of the support block 24. Accordingly, in a state where the die holding member 41 is fixed to the origin position of the support base 50 and all the base fixing bolts 71 are loosened, the punching punch 31 is inserted into the punching hole 32A by a manual operation as shown in fig. 6 so that the center axis of the punching punch 31 coincides with the center axis of the punching hole 32A, and then when all the base fixing bolts 71 are fastened and the pair of positioning pins 72 are removed, the origin adjustment of the die supporting mechanism 40 is completed.

As the origin adjusting means, for example, a structure may be considered in which the support base 50 is fixed to the base portion 24K by a pin, a key, or the like in advance, and the position of the blanking punch 31 with respect to the ram 12 is adjusted.

As shown in fig. 7, the guide mechanism includes, for example, the tapered guide portion 44A and the straight guide portion 44B in the top plate hole 44 of the die holding member 41, and the large diameter portion 31G, the small diameter portion 31H, and the stepped surface 31J of the blanking punch 31. Specifically, the difference between the radius (0.5×d3) of the upper end of the tapered guide portion 44A and the radius (0.5×d2) of the lower end of the blanking punch 31 is larger than the aforementioned first gap δ1, which is the range in which the die holding member 41 can slide relative to the support base 50. Thus, no matter where the die holding member 41 is located in a range in which it can slide with respect to the support base 50, the punching punch 31 protrudes into the top plate hole 44 without touching the upper surface of the top plate hole 44.

As shown in fig. 8, before the punching punch 31 protrudes into the punching hole 32A (more specifically, immediately before or simultaneously with sandwiching the metal plate W1 between the punching die 32 and the punching punch 31), the lower end of the large diameter portion 31G of the punching punch 31 protrudes into the straight guide portion 44B through the tapered guide portion 44A of the top plate hole 44, whereby the punching punch 31 and the punching hole 32A are centered. Thus, thereafter, the blanking punch 31 protrudes into the blanking hole 32A without the edge portion 31L of the blanking punch 31 abutting the edge portion 32L of the blanking hole 32A. For this reason, the second gap δ2, which is the difference between the radius (0.5×d2) of the small diameter portion 31H of the blanking punch 31 and the radius (0.5×d5) of the blanking hole 32A, is larger than the third gap δ3, which is the difference between the radius (0.5×d1) of the large diameter portion 31G of the blanking punch 31 and the radius (0.5×d4) of the straight guide portion 44B of the top plate hole 44.

The guide mechanism may be any structure as long as the punching punch 31 is guided in the top plate hole 44 so that the punching punch 31 protrudes into the punching hole 32A when the edge 31L of the punching punch 31 does not abut against the edge 32L of the punching hole 32A, and for example, a tapered portion corresponding to the tapered guide portion 44A is provided on the punching punch 31 side or the entire inside of the top plate hole 44 is formed as the tapered guide portion 44A.

The above description relates to the structure of the multi-station press machine 10 according to the present embodiment. Next, the operational effects of the multi-stage press machine 10 will be described. As shown in fig. 3, the die supporting mechanism 40 of the multi-stage press 10 of the present embodiment includes the die holding member 41 having the slit 41S penetrating in the front-rear direction H2, and the die holding member 41 includes the die holding base 42 for holding the punching die 32 at a position lower than the slit 41S, while the die holding base 43 includes the top plate portion 43 having the top plate hole 44 concentric with the punching hole 32A of the punching die 32 at a position upper than the slit 41S. The die holding member 41 is supported by the support base 50 so as to be slidable in the horizontal direction, and the tapered guide portion 44A and the straight guide portion 44B of the top plate hole 44 are in sliding contact with the punching punch 31, so that the die holding member 41 slides to a position where the punching hole 32A and the punching punch 31 are centered. Thus, even if the center of the punch 31 is offset from the center of the punch hole 32A due to thermal deformation or the like, the offset is eliminated before the punch 31 protrudes into the punch hole 32A, and the conventional problem of the punch 31 abutting against the opening edge of the punch hole 32A is suppressed, thereby improving the durability of the punch 31 and the punch die 32.

In addition, when the blank W2 is deep-drawn into the cylindrical workpiece W3 by the deep-drawing punch 35, the pressing of the blank W2 by the blank W2 is also stable, and thus the shape of the cylindrical workpiece W3 is also stable. Further, in the multi-station press machine 10, the cylindrical workpiece W3 thus produced is subjected to the chase processing, and therefore the shape of the final cylindrical workpiece W3 is also stable.

In addition, since the support base 50 can be fixed after the punching hole 32A and the punching punch 31 are centered by sliding the support base 50 in the horizontal direction in a state in which the die holding member 41 is fixed to the origin position of the support base 50, the range in which the die holding member 41 can slide with respect to the support base 50 can be effectively utilized, and accordingly, the slidable range can be narrowed to stabilize the punching operation of the blank W2.

Further, since the pair of positioning pins 72 for positioning the die holding member 41 at the origin position of the support base 50 are arranged at positions where the insertion of the metal plate W1 into the slit 41S is restricted, the start of blanking of the blank W2 in a state where the pair of positioning pins 72 is forgotten to be pulled out is prevented.

Second embodiment

The cylindrical workpiece generating device 30X of the present embodiment includes, for example, a cylindrical portion 43V rising from the top plate portion 43, and the inside of the top plate hole 44 on the inside has a uniform inner diameter as a whole. That is, the inside of the top plate hole 44 is the same as the straight guide portion 44B of the first embodiment. Even if the punching punch 31 is at the top dead center, the large diameter portion 31G of the punching punch 31 is not separated from the top plate hole 44. The other structure is the same as the first embodiment. The structure of the present embodiment also has the same operational effects as those of the first embodiment.

In the structure of the present embodiment, the same effect is achieved by providing the tapered guide portion 44A on the upper side and the straight guide portion 44B on the lower side from the middle position in the vertical direction in the top plate hole 44.

Other embodiments

(1) The die supporting mechanism 40 of the embodiment is a part of the cylindrical work generating device 30 included in the multi-stage press 10, but may be provided as a part of a separate cylindrical work generating device not included in the multi-stage press.

(2) The die supporting mechanism 40 described above may be applied to a press machine that is used only for producing a blank.

Specific examples of the technology included in the technical means are disclosed in the present specification and the drawings, but the technology described in the patent technical means is not limited to these specific examples, and includes a technology obtained by variously changing or modifying the specific examples, and a technology obtained by separately extracting a part of the technology from the specific examples.

Reference numerals illustrate:

10 multistation punching machine

12 pressure head

18 conveyor

24 support block

24K pedestal part

25 additional working punch

30. 30X cylindrical workpiece generating device

31 blanking punch

32 blanking die

32A blanking hole

35 deep drawing punch

36 drawing die

36A deep drawing hole

40 die supporting mechanism

41 die holding member

41S slit

42 die holding base

42P, 51P pin holes

43 roof portion

44 roof hole

44A conical guide

44B straight guide

50 support base

72 locating pin

WI metal plate

W2 blank

W3 cylindrical workpiece.

Claims

1. A die supporting mechanism comprising a die holding member through which a slit is horizontally penetrated, wherein a die holding base for holding a punching die having a punching hole is formed at a position below the slit in the die holding member, a top plate portion having a top plate hole concentric with the punching hole is formed at a position above the slit in the die holding member, a part of a metal plate inserted into the slit is punched as a blank by a punching punch lowered to the punching hole through the top plate hole, the top plate portion separates the metal plate from the raised punching punch,

the die supporting mechanism comprises:

a support base that supports the die holding member so as to be slidable in a horizontal direction; and

and a guide portion formed on an inner surface of the top plate hole and in sliding contact with the punching punch to slide the die holding member to a position where the punching hole and the punching punch are centered.

2. The die support mechanism of claim 1, wherein,

the die supporting mechanism has:

a positioning and fixing mechanism capable of changing the die holding member to a fixed state in which the die holding member is positioned and fixed at a preset origin position of the support base, and a fixed released state in which the die holding member is released from the fixation; and

and an origin adjusting mechanism for supporting the support base so as to be slidable in a horizontal direction and fixing the support base at an arbitrary position.

3. The die support mechanism of claim 2, wherein,

the positioning and fixing mechanism comprises:

two pairs of pin holes, which are formed with a pair at each of the die holding member and the support base and are coaxially aligned at the origin position; and

and a pair of positioning pins respectively fitted into the two pairs of pin holes arranged on the same axis.

4. The die supporting mechanism as claimed in claim 3, wherein,

the pair of positioning pins are disposed at positions that restrict insertion of the metal plate into the slit.

5. A cylindrical work generating apparatus, wherein,

the cylindrical work generating device includes:

the die support mechanism of any one of claims 1 to 4;

a cylindrical blanking punch which is cooperatively engaged with the die supporting mechanism to blank;

a drawing punch which is accommodated inside the blanking punch in a manner capable of moving up and down; and

a drawing die having a narrower hole smaller than the punching hole, and being held by being overlapped under the punching die on the die holding base,

and pressing the blank into the narrowed hole by the drawing punch in a state in which the blank is pressed against an opening edge of the narrowed hole by the punching punch, thereby forming a cylindrical workpiece.

6. A multi-station punching machine, wherein,

the multi-station press machine is provided with:

the cylindrical work generating apparatus according to claim 5;

a ram for supporting the punching punch and the plurality of additional processing punches in a row with the punching punch as a front end;

a support block in which a plurality of dies corresponding to the plurality of additional punches are incorporated;

a base portion that supports the die holding member of the cylindrical workpiece generating device in a state of being floated from the support block; and

and a conveying device that intermittently conveys the workpiece, which is punched out by the drawing punch onto the upper surface of the supporting head, to the plurality of additional punches.