JP6866056B1 - Die support mechanism, tubular workpiece generator and transfer press machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for preventing a defect in which a punching punch is pressed against an opening edge of a punching hole. SOLUTION: The die support mechanism 40 of the present disclosure includes a die holding member 41 through which a slit 41S penetrates, and a die holding member 41 below the slit 41S forms a die holding base 42 for holding a punching die 32. Above the slit 41S, there is a ceiling portion 43 having a ceiling hole 44 concentric with the punching hole 32A of the punching die 32. Then, the die holding member 41 is slidably supported by the support base 50 in the horizontal direction, and the tapered guide portion 44A and the straight guide portion 44B of the ceiling hole 44 and the punching punch 31 are in sliding contact with each other to form the punching hole 32A. The die holding member 41 slides to a position where it is centered on the punch punch 31. [Selection diagram] Fig. 3

Description

The present disclosure relates to a die support mechanism, a tubular work generator for forming a tubular work, and a transfer press machine for drawing and ironing a tubular work.

As a die support mechanism, one that supports a punching die for punching a blank material from a sheet metal is known (see, for example, Patent Document 1).

JP-A-2016-203212 (Fig. 1)

By the way, the die support mechanism or the support portion of the punching punch corresponding thereto is provided with a position adjusting mechanism, and the center of the punching punch and the punching hole are provided before the continuous operation of continuously punching the blank material. Centering adjustment is performed to match the center of the. However, during continuous operation, the center of the punching punch and the center of the punching hole may gradually shift due to some cause such as thermal deformation, and the punching punch may be pressed against the opening edge of the punching hole. There is a need for the development of technology that suppresses the occurrence of such problems.

The invention of claim 1 made to solve the above problems includes a die holding member through which a slit penetrates horizontally, and a punched die having a punched hole is held below the die holding member. The upper side of the slit forms a ceiling portion having a ceiling hole concentric with the punched hole, and a part of the sheet metal inserted into the slit reaches the punched hole through the ceiling hole. A support base that slidably supports the die holding member in a die support mechanism in which the ceiling portion is punched as a blank material by a descending punch punch and the sheet metal is separated from the rising punch punch. A die support provided with a guide portion formed on the inner surface of the ceiling hole, which slides into a position where the punched hole is centered on the punched punch and slides the die holding member to a position where the punched hole is centered on the punched punch. It is a mechanism.

The invention of claim 2 is a positioning and fixing mechanism that can change the die holding member into a fixed state in which the die holding member is positioned and fixed at a preset origin position on the support base and a fixed state in which the fixing is released. The die support mechanism according to claim 1, further comprising an origin adjusting mechanism capable of slidably supporting the support base in the horizontal direction and fixing the support base at an arbitrary position.

According to the third aspect of the present invention, the positioning and fixing mechanism is formed in pairs on the die holding member and the support base, and is aligned coaxially with two pairs of pin holes coaxially arranged at the origin position. The die support mechanism according to claim 2, further comprising a pair of positioning pins fitted in each of the two pairs of pin holes.

The invention according to claim 4 is the die support mechanism according to claim 3, wherein the pair of positioning pins is arranged at a position for restricting insertion of the sheet metal into the slit.

The invention of claim 5 comprises the die support mechanism according to any one of claims 1 to 4, a cylindrical punching punch for punching the blank material in cooperation with the die support mechanism, and the above. A drawing punch that is accommodated inside the punching punch so as to be movable up and down, and a drawing die that has a drawing hole smaller than the punching hole and is stacked under the punching die and held by the die holding base. This is a tubular work generator that presses the blank material against the opening edge of the narrowing hole with the punching punch and pushes the blank material into the narrowing hole with the drawing punch to form a tubular work.

The invention of claim 6 comprises a ram that supports the tubular work generator according to claim 5, the punching punch, and a plurality of additional machining punches in a line with the punching punch at the head, and the ram. A support block containing a plurality of dies corresponding to a plurality of additional machining punches, a pedestal portion that supports the die holding member of the tubular work generator in a state of being lifted from the support block, and the drawing punch. This is a transfer press machine including a transfer device that intermittently conveys the work that has been lowered to the upper surface of the support bed to the plurality of additional punches.

The die support mechanism according to claim 1 includes a die holding member through which the slit horizontally penetrates, and the lower side of the die holding member forms a die holding base for holding the punched die, while the upper side of the slit is punched. The ceiling has a ceiling hole concentric with the punched hole of the die. Then, the die holding member is supported by the support base so as to be slidable in the horizontal direction, and the guide portion of the ceiling hole is in sliding contact with the punching punch to hold the die at a position where the punching hole is centered on the punching punch. The member slides. As a result, even if the center of the punching punch and the center of the punching hole deviate due to thermal deformation or the like, the misalignment is eliminated before the punching punch rushes into the punching hole, and the punching punch has the punching hole as in the conventional case. The defect of contacting the opening edge is suppressed, and the durability of the punching punch and the punching die is improved.

In the die support mechanism of claim 2, in a state where the die holding member is fixed at the origin position of the support base, the support base is slid in the horizontal direction to center the punching hole and the punching punch, and then the support base is used. Can be fixed. As a result, the slidable range of the die holding member with respect to the support base can be effectively used, and the slidable range can be narrowed accordingly to stabilize the punching operation of the blank material.

In the die support mechanism of claim 3, the die holding member is the origin of the support base by fitting a pair of positioning pins into two pairs of pin holes formed in a pair of the die holding member and the support base. Easily positioned in position. Further, in the configuration of claim 4, since the pair of positioning pins are arranged at positions that restrict the insertion of the sheet metal into the slit, punching of the blank material starts in a state where the pair of positioning pins is forgotten to be removed. It is prevented from being done.

In the tubular work generator according to claim 5, when the blank material is drawn and formed into a tubular work by a drawing punch, the blank material is pressed against the opening edge of the drawing hole by the punching punch. Since the die support mechanism of any one is provided to prevent misalignment, the blank material is stably pressed by the punching punch, and the shape of the tubular workpiece is also stable.

In the transfer press machine of claim 6, since the tubular work generated by the tubular work generator according to claim 5 is additionally machined by a plurality of additional machining punches, the shape of the additionally machined work is stable. ..

Front view of the transfer press machine according to the first embodiment of the present disclosure. Side sectional view of the tubular workpiece generator Perspective view of the tubular workpiece generator Regular cross-sectional view of the punched punch separated from the die holding member An exploded perspective view of the die support mechanism Regular cross-sectional view of the tubular workpiece generator with the die holding member locked Partially enlarged normal cross-sectional view of punched punch and ceiling hole Partially enlarged normal cross-sectional view of the punched punch and ceiling hole just before punching the blank material Partially enlarged normal cross-sectional view of the punched punch and ceiling hole after punching the blank material Regular cross-sectional view of the tubular workpiece generator of the second embodiment

[First Embodiment]
Hereinafter, the transfer press machine 10 according to the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 9. As shown in FIG. 1, the transfer press machine 10 is provided with a plurality of punches (see reference numerals 31, 25, 25X in FIG. 1) arranged side by side at the lower end of a ram 12 that is vertically supported by a support frame 11. .. Hereinafter, the arrangement direction of the plurality of punches is referred to as "horizontal direction H1", and the horizontal direction orthogonal to the arrangement direction is referred to as "front-back direction H2". In addition, the side of the transfer press 10 displayed in FIG. 1 is referred to as the "front side" and the opposite side is referred to as the "rear side", and the right side of the transfer press 10 when viewed from the front side is simply the "right side" and vice versa. The side is simply referred to as the "left side".

Of the plurality of punches at the lower end of the ram 12, the punch at the left end is a punching punch 31, which has a tubular shape as shown in FIG. 4 and houses the lower end of the drawing punch 35 inside. Further, the punching punch 31 and the drawing punch 35 form a part of the tubular work generating device 30 included in the transfer press machine 10, and as shown in FIG. 9, the punching punch 31 is from the sheet metal W1 to the blank material W2. Is punched out, and as shown in FIG. 2, the blank material W2 is formed into the tubular work W3 by the drawing punch 35. That is, the tubular work generation device 30 generates the tubular work W3 from the sheet metal W1.

As shown in FIG. 1, the plurality of punches other than the left end portion and the right end portion of the ram 12 are additional machining punches 25, and the plurality of additional machining dies 26 corresponding to the additional machining punches 25 support the lower end of the ram 12. It is provided in the block 24. Then, each additional machining punch 25 pushes the tubular work W3 into a forming hole (not shown) of each additional machining die 26 to draw or iron. Further, the tubular work W3 pushed into each forming hole is extruded above the forming hole while being sandwiched between a knockout pin (not shown) and an additional machining punch 25, and has a tubular shape fitted to each additional machining punch 25. It is pulled out from the additional work punch 25 by the work stripper 25S. Then, the transfer device 18 conveys the tubular work W3 above each forming hole to above each forming hole on the right side. This operation is repeated, and the tubular work W3 is additionally machined a plurality of times by the plurality of additional machining punches 25 and the additional machining die 26. The punch at the right end of the ram 12 is a punch 25X, and the tubular work W3 conveyed by the transfer device 18 is punched into a discharge path (not shown). The tubular work W3 that has fallen into the discharge path is collected in a collection box (not shown).

As shown in FIG. 2, the transfer device 18 supports a plurality of pairs of fingers 20 facing each other in the front-rear direction H2 with a pair of support rails 19 extending in the lateral direction H1 so as to be approachable and separable, and a coil spring (not shown). The structure is such that the fingers 20 are urged to approach each other. Then, a plurality of pairs of fingers 20 grip the tubular work W3, move from each additional machining die 26 onto the additional machining die 26 to the right of them, and deliver the tubular work to the additional machining punch 25 to form a tubular shape. The work W3 is intermittently conveyed to the right side in the lateral direction H1.

The space between the punching punch 31 and the leftmost additional machining punch 25 is a so-called dummy stage having no punch and die, and the tubular work W3 conveyed to the dummy stage by the transfer device 18 is not shown. It is sandwiched between the knockout pin and the lower surface of the support base 50, which will be described later, from the vertical direction and temporarily held.

The ram 12, the transfer device 18, the plurality of knockout pins, and the plurality of work strippers 25S are driven by the same drive source. Specifically, as shown in FIG. 1, the upper shaft 13 and the lower shaft 17 extending in the lateral direction H1 are rotatably supported on the upper portion and the lower portion of the support frame 11, respectively, and are supported on the left side of the support frame 11. Is rotatably supported by a side shaft 14 extending in the vertical direction. Then, the bevel gear 14G at the upper end of the side shaft 14 and the bevel gear 14G at one end of the upper shaft 13 are gear-connected, and the lower end of the side shaft 14 and one end of the lower shaft 17 are gearboxed. The upper shaft 13, the side shaft 14, and the lower shaft 17 are rotationally driven by a common drive source by being connected by a gear (not shown) built in the 17G.

Then, the ram 12 moves up and down by receiving power from a pair of cams 13A that rotate integrally with the upper shaft 13, and a plurality of knockout pins move up and down by receiving power from a plurality of cams (not shown) that rotate integrally with the lower shaft 17. To do. Further, the plurality of work strippers 25S move up and down by receiving power from a plurality of cams (not shown) of the lower shaft 17 through a link mechanism (not shown) arranged behind the support block 24. Further, a cam 14A is also provided in the middle portion of the side shaft 14 so as to be integrally rotatable. Then, the cam 14A is accommodated between a pair of communication bars (not shown) that are passed between one ends of the pair of support rails 19 and between the positions closer to each other, whereby the ram 12 is raised and lowered. A pair of support rails 19 reciprocate in the lateral direction H1 in synchronization with the operation.

Hereinafter, the configuration of the tubular work generator 30 will be described in detail. FIG. 3 shows a punching punch 31, a drawing punch 35, and a die support mechanism 40, which are the main parts of the tubular work generator 30. As shown in FIG. 2, the drawing punch 35 has a structure in which a flat columnar punch main body portion 35B having a larger outer diameter is fixed to the lower end of a shaft portion 35A having a circular cross section. Further, the corner portion where the lower surface and the side surface of the punch main body portion 35B intersect is chamfered in an arc shape.

As shown in FIG. 3, the punching punch 31 includes an upper end cylindrical portion 31C, a first prismatic portion 31D, a second chamfered prismatic portion 31E, and a punch main body portion 31F (see FIG. 4) in this order from the top. The upper end cylindrical portion 31C protrudes from the center of the upper surface of the first prism portion 31D. Further, the second chamfered prism portion 31E has a shape in which the corner portion of the first prism portion 31D is chamfered wider than the chamfer width of the first prism portion 31D. Further, the punch main body 31F (see FIG. 4) has a substantially cylindrical shape.

Specifically, as shown in FIG. 4, the punch main body 31F has a slightly reduced diameter on the lower side of the middle portion in the vertical direction in a stepped manner, and the upper side forms a large diameter portion 31G, while the lower side has a small diameter. It is part 31H. Further, as shown in FIG. 7, the stepped surface 31J between the large diameter portion 31G and the small diameter portion 31H is a circle having a cross-sectional 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. It has an arc shape and the upper end is continuous with the large diameter portion 31G. Further, the corner portion between the lower surface 31K of the punch punch 31 and the side surface of the punch body portion 31F (that is, the side surface of the small diameter portion 31H) is an edge portion 31L whose both sides are orthogonal to the pin angle state. The stepped surface 31J may have a tapered shape.

As shown in FIG. 2, the punching punch 31 has a tubular shape as described above, and the inside thereof has a small diameter hole portion 31A at the upper end portion and a large diameter hole portion 31B other than the upper end portion. Then, the shaft portion 35A of the drawing punch 35 penetrates the small diameter hole portion 31A in a linear motion, and the punch main body portion 35B of the drawing punch 35 is housed in the large diameter hole portion 31B.

As shown in FIG. 1, the punching punch 31 is fixed to the ram 12 and moves up and down together with the ram 12, whereas the drawing punch 35 is rotatably supported by the support frame 11 from a seesaw-shaped lever 16. It receives power and goes up and down.

Specifically, one end of the lever 16 is hinged to the upper end of the drawing punch 35 so as to be movable in the lateral direction H1. Further, the other end of the lever 16 is provided with a cam follower (not shown) that protrudes in the direction of the rotation axis. The cam follower is engaged with the cam groove 15A on the outer peripheral surface of the cylindrical body 15 that rotates integrally with the side shaft 14. Then, in the initial stage when the punch punch 31 descends, the punch body portion 35B of the squeeze punch 35 is housed in the punch punch 31, and after the punch punch 31 reaches the bottom dead center, the squeeze punch 35 The punch body 35B appears downward from the punch punch 31 and descends to reach bottom dead center.

The punching punch 31 and the drawing punch 35 of the present embodiment both have a circular flat cross section but are elliptical or oval, and the tubular work generator 30 forms an elliptical or oval tubular workpiece. It may be generated. Further, the diaphragm punch 35 may be configured to operate by receiving power from a power source other than the ram 12.

As shown in FIG. 3, the die support mechanism 40 has a structure in which the die holding member 41 is supported by the support base 50. As shown in FIG. 5, the die holding member 41 has a slit 41S penetrating in the front-rear direction H2, and the punching die 32 and the drawing die 36 are held by the die holding base 42 below the slit 41S, and the slit. The ceiling portion 43 above the 41S is provided with a ceiling hole 44 through which the punching punch 31 and the drawing punch 35 pass.

Specifically, the entire die holding base 42 has a rectangular plate shape having a horizontally long planar shape, and the entire ceiling portion 43 has the same size as the die holding base 42 in the horizontal direction H1 and the die in the front-rear direction H2. It has a rectangular plate shape smaller than the holding base 42. Further, a pair of square ridges 43T having a square cross section and extending in the front-rear direction H2 are provided on both end edges of the lower surface of the ceiling portion 43 in the lateral direction H1. Then, the ceiling portion 43 is arranged at the center of the die holding base 42 in the front-rear direction H2, and the ceiling portion 43 is die by a plurality of bolts and a pair of pins 75 that vertically penetrate a pair of square ridges 43T. It is fixed to the holding base 42, and the slit 41S described above is formed between the upper surface of the die holding base 42 and the lower surface of the ceiling portion 43.

The central portion of the ceiling portion 43 in the lateral direction H1 forms a thick portion 43U that is stepped upward, and the ceiling hole 44 vertically penetrates the thick portion 43U. Further, the ceiling hole 44 has, for example, a circular cross section. Then, as shown in FIG. 7, the upper side of the ceiling hole 44 from the intermediate position in the vertical direction forms the tapered guide portion 44A whose diameter increases upward, while the lower side forms the same inner diameter as the lower end of the tapered guide portion 44A. The straight guide portion 44B has a uniform inner diameter (D4 in FIG. 7) as a whole.

As shown in FIG. 4, the die holding base 42 is formed with a die accommodating hole 46 coaxially with the ceiling hole 44. The die accommodating hole 46 is reduced in diameter in a stepped manner at an intermediate position in the vertical direction, and its stepped surface forms a horizontal die support surface 46B, and a punching die 32 is formed on a large diameter portion 46A above the die support surface 46B. And the drawing die 36 are fitted with the drawing die 36 facing down. Further, the punching die 32 and the drawing die 36 are fixed to the die holding base 42 by a plurality of bolts (not shown) penetrating them vertically.

The drawing die 36 has a disk shape and has a circular drawing hole 36A at the center thereof. Further, the corner portion where the inner surface of the aperture hole 36A and the horizontal upper surface 36B of the aperture die 36 intersect is an arc-shaped chamfered surface 36C. Further, the inner diameter of the throttle hole 36A is larger than the small diameter portion 46C of the die accommodating hole 46 below the die support surface 46B.

The punching die 32 has a disk shape having the same outer diameter as the drawing die 36, and has a circular punching hole 32A larger than the drawing hole 36A at the center thereof. The upper surface 36B of the drawing die 36 is exposed at the lower end of the punching hole 32A. Further, the annular protrusion 32T projects stepwise from the opening edge of the punching hole 32A on the upper surface 32B of the punching die 32. The upper surface 32C of the annular protrusion 32T is horizontal, and an inclined surface 32D is formed between the upper surface 32C and the upper surface 32B. Further, the corner portion between the upper surface 32C of the annular protrusion 32T and the inner surface of the punching hole 32A is an edge portion 32L whose both surfaces are orthogonal to the pin angle state.

As shown in FIG. 5, on the upper surface of the die holding base 42, a pair extending in the front-rear direction H2 at two locations sandwiched between the die accommodating hole 46, a pair of square ridges 43T, and the die accommodating hole 46. An upper surface groove 42M is formed. Further, each upper surface groove 42M has a quadrangular cross section, and a pair of support column insertion holes 42A penetrating the die holding base 42 up and down are opened at positions near both ends in the longitudinal direction of the bottom surface thereof. A notch 43A is formed at the edge of the ceiling 43 to avoid interference with a tool for tightening a bolt 70, which will be described later, which is passed through the column insertion hole 42A.

A pair of pin holes 42P that vertically penetrate the die holding base 42 are formed at both ends of the die holding base 42 in the front side portion from the ceiling portion 43 in the left-right direction. Further, a part of both pin holes 42P is arranged at a position in front of the slit 41S.

As shown in FIG. 5, the support base 50 has a receiving groove 51 having a square groove structure extending in the lateral direction H1 on the upper surface. Then, as shown in FIG. 3, the die holding base 42 is received in the receiving groove 51. Further, as shown in FIG. 5, a total of four columns 52, which are received by the column insertion holes 42A of the die holding base 42, stand up from the bottom surface of the receiving groove 51. Further, a pair of beams 53 having a quadrangular cross section and extending in the lateral direction H1 are overlapped and fixed on the upper surface of each pair of columns 52 facing each other in the front-rear direction H2.

Specifically, as shown in FIG. 6, the column 52 has a cylindrical shape and is fitted into a circular recess 55A formed on the bottom surface of the receiving groove 51. Further, the female screw hole 55B vertically penetrates the center of the bottom surface of the recess 55A. Further, counterbore holes 53Z are formed in two positions of the beam 53 directly above the support column 52, and the lower end portion of the bolt 70 whose head portion is received in the counterbore hole 53Z is the female described above. The beam 53 is fastened to the screw hole 55B and fixed to the receiving groove 51 together with the support column 52. The die holding base 42 is held by the support base 50 by the beams 53 and the columns 52. The upper surface of the beam 53, the upper surface of the die holding base 42, and the upper surface of the support base 50 are arranged substantially flush with each other.

As shown in FIGS. 2 and 5, the support base 50 is provided with a through hole 54 penetrating vertically on the same axis as the die accommodating hole 46 of the die holding base 42. The through hole 54 has substantially the same inner diameter as the small diameter portion 46C at the lower end of the die accommodating hole 46. Further, the support base 50 is provided with one recess 54A that faces in the front-rear direction H2 and opens to the inner surface of the through hole 54. A pair of work strippers 60 are housed in the pair of recesses 54A and are urged to approach each other.

As shown in FIG. 5, a pair of fixing holes 59 are provided at both ends of the support base 50 in the front-rear direction H2. Further, as shown in FIG. 2, the support base 50 is superposed on the pair of pedestals 24K fixed to the upper surface of the support block 24 and facing each other in the front-rear direction H2, and the base fixing bolt 71 is passed through the fixing hole 59. Is fastened and fixed to the screw hole 24N of the pedestal portion 24K. As a result, the entire support base 50 is held in a state of floating from the upper surface of the support block 24, and the transfer device 18 described above penetrates between the support base 50 and the support block 24.

As shown in FIG. 4, the punching punch 31 described above is arranged at a position separated above the ceiling portion 43 together with the drawing punch 35 when the ram 12 is located at the top dead center. Then, in a state where the sheet metal W1 passed through the slit 41S covers the punching hole 32A of the punching die 32, the punching punch 31 passes through the ceiling hole 44 of the ceiling portion 43 and rushes into the punching hole 32A. As shown in 9, a part of the sheet metal W1 is punched out as a blank material W2. Specifically, the edge portion 31L of the punching punch 31 and the edge portion 32L of the punching die 32 cut the sheet metal W1 into a circular shape to separate the blank material W2 from the sheet metal W1. Then, the bottom dead center is reached when the lower surface 31K of the punch punch 31 is adjacent to the upper surface 36B of the drawing die 36. As a result, the outer edge portion of the blank material W2 is sandwiched between the lower surface 31K of the punch punch 31 and the upper surface 36B of the drawing die 36.

In the drawing punch 35, the outer edge portion of the blank material W2 is sandwiched between the punching punch 31 and the drawing die 36, and the blank material W2 descends downward from the punching punch 31 to push the blank material W2 into the drawing hole 36A. As shown, it is formed into a tubular work W3.

The draw punch 35 then descends with the tubular workpiece W3 below the support base 50 and passes between a pair of work strippers 60, and further between a pair of fingers 20 at the left end of the transfer device 18. It reaches the bottom dead center when it enters. Then, when the drawing punch 35 rises, the tubular work W3 is pulled away from the drawing punch 35 by the pair of work strippers 60. Further, the punching punch 31 is raised before the drawing punch 35, and at that time, the sheet metal W1 outside the punching punch 31 comes into contact with the ceiling portion 43 and is separated from the punching punch 31.

The tubular work W3 generated by the tubular work generating device 30 as described above and delivered to the pair of fingers 20 of the transfer device 18 passes through the above-mentioned dummy stage and onto the plurality of additional machining dies 26. As described above, additional machining is performed by the plurality of additional machining punches 25 and additional machining dies 26.

By the way, the operation of punching the blank material W2 from the sheet metal W1 by the punching punch 31 and the punching die 32 is smoothly performed if the central axis of the punching punch 31 and the central axis of the punching hole 32A match. For some reason, the central axis of the punching punch 31 and the central axis of the punching hole 32A may deviate beyond the permissible range during continuous operation of the transfer press machine 10. Then, the edge portion 31L of the punching punch 31 comes into contact with the edge portion 32L of the opening edge of the punching hole 32A and is damaged (hereinafter, referred to as a “scratch defect”).

The tubular work generation device 30 is provided with a floating mechanism, a guide mechanism, a positioning and fixing mechanism, and an origin adjusting mechanism in order to prevent a squeeze failure. The floating mechanism is a mechanism in which a clearance is provided in a portion where the support base 50 holds the die holding member 41, and the support base 50 slidably supports the die holding member 41 in an arbitrary horizontal direction within the clearance range. .. The guide mechanism is a mechanism that guides the die holding member 41 so as to move in a direction in which the central axis of the punching hole 32A coincides with the central axis of the punching punch 31 by sliding contact between the die holding member 41 and the punching punch 31. Is. The positioning and fixing mechanism is a mechanism for fixing the die holding member 41 to the origin position in the slideable range of the support base 50. The origin adjustment mechanism supports the support base 50 so that the central axis of the punch punch 31 and the central axis of the punch hole 32A coincide within an allowable range with the die holding member 41 fixed at the origin position of the support base 50. This is a mechanism for adjusting the position with respect to the block 24. Hereinafter, specific configurations of these mechanisms will be described.

The positioning and fixing mechanism of the die support mechanism 40 of the present embodiment is one of a pair of pin holes 42P of the die holding member 41 shown in FIG. 6 and a support base 50 provided directly below the pin holes 42P. It includes a pair of pin holes 51P and a pair of positioning pins 72. Then, the positioning pins 72 are inserted into the pair of pin holes 42P and 51P arranged vertically, and the die holding member 41 is two-dimensionally positioned in the horizontal direction with respect to the support base 50. Further, the positioned position is the origin position of the die holding member 41 with respect to the support base 50.

Further, the upper portion of the positioning pin 72 has a stepped diameter so as to come into contact with the opening edge of the pin hole 42P and protrude from the upper surface of the die holding base 42. Further, as shown in FIG. 3, the upper portions of the pair of positioning pins 72 are both arranged at positions facing the slit 41S from the front-rear direction H2. As a result, when the sheet metal W1 is passed through the slit 41S while the pair is still equipped with the positioning pin 72, it interferes with the positioning pin 72, and it becomes possible to notice that the positioning pin 72 has been forgotten to be pulled out. There is. That is, it is possible to prevent the transfer press machine 10 from starting continuous operation while the die holding member 41 is fixed to the support base 50.

As the positioning and fixing mechanism, when the die holding member 41 is arranged at two places of the die holding member 41 and two places of the support base 50 at the origin position of the support base 50, they are arranged vertically and flush with each other. A structure in which the die holding member 41 is fixed to the origin position of the support base 50 by providing an alignment surface to be arranged and fixing a common flat member to each pair of the alignment surfaces. It may be.

As a floating mechanism, as shown in FIG. 6, with the die holding member 41 positioned at the origin position of the support base 50, the outer peripheral surfaces of all the columns 52 and the inner peripheral surfaces of all the column insertion holes 42A. The structure is such that a first clearance δ1 having a predetermined size (for example, 0.5 to 2 [mm]) or more is formed between the two. That is, the difference between the radius of the outer peripheral surface of the support column 52 and the radius of the inner peripheral surface of the support column insertion hole 42A is the first clearance δ1 of a predetermined dimension or more. Further, with the die holding member 41 positioned at the origin position of the support base 50, between the beam 53 and the pair of inner surfaces of the upper surface groove 42M, and inside the pair of the die holding member 41 and the receiving groove 51. A clearance having a size of the first clearance δ1 or more is formed between the side surface and the side surface. Further, a clearance (not shown) is provided between the lower surface of the beam 53 and the bottom surface of the upper surface groove 42M so that the beam 53 does not press the die holding member 41 against the bottom surface of the receiving groove 51. As a result, when the pair of positioning pins 72 is removed, the die holding member 41 can slide with respect to the support base 50 in an arbitrary horizontal direction within the range of the first clearance δ1.

In the present embodiment, the die holding member 41 is arranged at the center of the movable range with respect to the support base 50 at the origin position, but the punching punch 31 is provided with respect to the punching hole 32A during the continuous operation of the transfer press machine 10. When there is a tendency to shift to one side in a certain direction, it is preferable that the die holding member 41 is displaced from the center of the movable range with respect to the support base 50 at the origin position correspondingly.

As the origin adjusting mechanism, as shown in FIG. 2, between a plurality of base fixing bolts 71 for fixing the support base 50 to the pedestal portion 24K and a plurality of fixing holes 59 of the support base 50 through which they are passed. With a clearance of at least 1st clearance δ1, loosening all base fixing bolts 71 makes the support base 50 slidable, and tightening the base fixing bolts makes the support base 50 any of the support blocks 24. It has a structure that is fixed in position. As a result, 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, and the punching punch 31 is punched into the punching hole 32A by manual operation as shown in FIG. By inserting it into, the central axis of the punching punch 31 and the central axis of the punching hole 32A are aligned, and all the base fixing bolts 71 are tightened there, and if the pair of positioning pins 72 is removed, the die support mechanism 40 Origin adjustment is complete.

As the origin adjusting mechanism, a structure is also conceivable in which the support base 50 is positioned and fixed to the pedestal portion 24K by a pin, a key, or the like, and the punching punch 31 is positioned and fixed with respect to the ram 12.

As shown in FIG. 7, the guide mechanism includes the taper guide portion 44A and the straight guide portion 44B in the ceiling hole 44 of the die holding member 41, the large diameter portion 31G of the punch punch 31, the small diameter portion 31H, and the stepped surface 31J. Includes and. Specifically, the difference between the radius of the upper end of the taper guide portion 44A (0.5 × D3) and the radius of the lower end of the punching punch 31 (0.5 × D2) is the difference between the die holding member 41 and the support base 50. It is larger than the above-mentioned first clearance δ1, which is a slideable range. As a result, the punch punch 31 rushes into the ceiling hole 44 without hitting the upper surface of the ceiling hole 44, regardless of where the die holding member 41 is located in the slideable range with respect to the support base 50.

Further, as shown in FIG. 8, before the punching punch 31 enters the punching hole 32A (more specifically, immediately before or sandwiching the sheet metal W1 between the punching die 32 and the punching punch 31). The lower end of the large diameter portion 31G of the punch punch 31 passes through the taper guide portion 44A of the ceiling hole 44 and rushes into the straight guide portion 44B, and the punch punch 31 and the punch hole 32A are centered. To. As a result, after that, the punching punch 31 rushes into the punching hole 32A without the edge portion 31L of the punching punch 31 coming into contact with the edge portion 32L of the punching hole 32A. Therefore, the second clearance δ2, which is the difference between the radius (0.5 × D2) of the small diameter portion 31H of the punching punch 31 and the radius (0.5 × D5) of the punching hole 32A, is the punching punch 31. It is larger than the third clearance δ3, which is the difference between the radius (0.5 × D1) of the large diameter portion 31G and the radius (0.5 × D4) of the straight guide portion 44B of the ceiling hole 44.

As a guide mechanism, the punching punch 31 is inserted into the ceiling hole 44 so that the punching punch 31 enters the punching hole 32A without contacting the edge portion 32L of the punching hole 32A. Any structure may be used as long as it guides the ceiling hole 44. For example, a taper portion corresponding to the taper guide portion 44A is provided on the punching punch 31 side, or the entire inside of the ceiling hole 44 is made into the taper guide portion 44A. The configuration is also conceivable.

This concludes the description of the configuration of the transfer press machine 10 of the present embodiment. Next, the operation and effect of the transfer press machine 10 will be described. As shown in FIG. 3, the die support mechanism 40 of the transfer press machine 10 of the present embodiment includes a die holding member 41 through which the slit 41S penetrates in the front-rear direction H2, and the slit 41S of the die holding members 41 is provided. The lower side forms a die holding base 42 for holding the punching die 32, while the upper side of the slit 41S is a ceiling portion 43 having a ceiling hole 44 concentric with the punching hole 32A of the punching die 32. Then, the die holding member 41 is slidably supported by the support base 50 in the horizontal direction, and the tapered guide portion 44A and the straight guide portion 44B of the ceiling hole 44 and the punching punch 31 are in sliding contact with each other to form the punching hole 32A. The die holding member 41 slides to a position where it is centered on the punch punch 31. As a result, even if the center of the punching punch 31 and the center of the punching hole 32A deviate due to thermal deformation or the like, the misalignment is eliminated before the punching punch 31 rushes into the punching hole 32A, and punching is performed as in the conventional case. The problem that the punch 31 comes into contact with the opening edge of the punch hole 32A is suppressed, and the durability of the punch punch 31 and the punch die 32 is improved.

Further, when the blank material W2 is drawn and formed into the tubular work W3 by the drawing punch 35, the holding of the blank material W2 by the blank material W2 is also stable, so that the shape of the tubular work W3 is also stable. Then, in the transfer press machine 10, since the tubular work W3 thus generated is additionally machined, the shape of the final tubular work W3 is also stable.

Further, with the die holding member 41 fixed at the origin position of the support base 50, the support base 50 is slid in the horizontal direction to center the punching hole 32A and the punching punch 31, and then the support base 50 is fixed. Therefore, the slidable range of the die holding member 41 with respect to the support base 50 can be effectively used, and the slidable range can be narrowed by that amount to stabilize the punching operation of the blank material W2. it can.

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 that restrict the insertion of the sheet metal W1 into the slit 41S, the pair of positioning pins It is possible to prevent the blank material W2 from being punched in a state where the 72 is forgotten to be pulled out.

[Second Embodiment]
The tubular work generation device 30X of the present embodiment includes a tubular portion 43V that stands up from the ceiling portion 43, and the entire inside of the ceiling hole 44 inside the tubular workpiece generation device 30X has a uniform inner diameter. That is, the inside of the ceiling hole 44 is the same as that of the straight guide portion 44B of the first embodiment. Even if the punching punch 31 reaches the top dead center, the large diameter portion 31G of the punching punch 31 does not come off from the ceiling hole 44. Other configurations are the same as those in the first embodiment. The configuration of the present embodiment also has the same effect as that of the first embodiment.

In the structure of the present embodiment, the same effect can be obtained by using the taper guide portion 44A on the upper side and the straight guide portion 44B on the lower side from the intermediate position in the vertical direction in the ceiling hole 44.

[Other Embodiments]
(1) The die support mechanism 40 of the above-described embodiment is a part of the tubular work generating device 30 included in the transfer press machine 10, but is not included in the transfer press machine. It may be provided as part.

(2) Further, the die support mechanism 40 described above may be simply applied to a press machine for producing a blank material.

Although specific examples of the techniques included in the claims are disclosed in the present specification and the drawings, the techniques described in the claims are not limited to these specific examples, and are specific. It includes various modifications and changes of the examples, and also includes a part of the specific examples taken out independently.

10 Transfer press machine 12 Ram 18 Transfer device 24 Support block 24K Pedestal 25 Additional machining punch 30, 30X Cylindrical work generator 31 Punch punch 32 Punch hole 32 Punch hole 35 Squeeze punch 36 Squeeze die 36A Squeeze hole 40 Die support Mechanism 41 Die holding member 41S Slit 42 Die holding base 42P, 51P Pin hole 43 Ceiling part 44 Ceiling hole 44A Tapered guide part 44B Straight guide part 50 Support base 72 Positioning pin W1 Sheet metal W2 Blank material W3 Cylindrical work

Claims (6)

A die holding member through which the slit penetrates horizontally is provided, and the lower side of the die holding member below the slit forms a die holding base for holding a punched die having punched holes, and the upper side of the slit is the punching. A ceiling portion having a ceiling hole concentric with the punched hole is formed, and a part of the sheet metal inserted into the slit is punched as a blank material by a punching punch that descends to the punched hole through the ceiling hole, and the ceiling portion is punched. In the die support mechanism that separates the sheet metal from the rising punching punch,
A support base that slidably supports the die holding member in the horizontal direction,
A die support mechanism formed on the inner surface of the ceiling hole and provided with a guide portion that slides in contact with the punching punch and slides the die holding member to a position where the punching hole is centered on the punching punch. .. A positioning and fixing mechanism that can change between a fixed state in which the die holding member is positioned and fixed at a preset origin position on the support base and a fixed state in which the fixing is released.
The die support mechanism according to claim 1, further comprising an origin adjusting mechanism capable of slidably supporting the support base in the horizontal direction and fixing the support base at an arbitrary position. The positioning and fixing mechanism includes two pairs of pin holes formed on the die holding member and the support base one by one and arranged coaxially at the origin position.
The die support mechanism according to claim 2, further comprising a pair of positioning pins fitted in each of the two pairs of pin holes arranged coaxially. The die support mechanism according to claim 3, wherein the pair of positioning pins is arranged at a position that restricts insertion of the sheet metal into the slit. The die support mechanism according to any one of claims 1 to 4, and the die support mechanism.
A tubular punching punch that punches out the blank material in cooperation with the die support mechanism,
A squeeze punch that can be moved up and down inside the punch
It has a drawing hole smaller than the punching hole, and has a drawing die that is stacked under the punching die and held by the die holding base.
A tubular work generator that presses the blank material against the opening edge of the narrowing hole with the punching punch and pushes the blank material into the narrowing hole with the drawing punch to form a tubular work. The tubular work generator according to claim 5 and
A ram that supports the punching punch and a plurality of additional punches in a line with the punching punch at the top,
A support block containing a plurality of dies corresponding to the plurality of additional punches, and
A pedestal portion that supports the die holding member of the tubular work generator in a state of being floated from the support block, and a pedestal portion.
A transfer press machine including a transfer device that intermittently conveys the work that has been lowered to the upper surface of the support bed by the drawing punch to the plurality of additional machining punches.

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