JP2006051541A - Die cushion device of press machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die cushion device of a press machine for manufacturing a plurality of kinds of products having different sizes by one press machine and capable of minimizing a production facility. <P>SOLUTION: The die cushion device comprises a plurality of die cushion units each having a cushion pad and a vertically driving means for vertically driving the cushion pad are arranged side by side in a direction perpendicular to a work conveying direction to the press and a control means capable of individually and independently controlling the plurality of die cushion units. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    The present invention relates to a die cushion device for a press machine, and more particularly to a die cushion device suitable for use in a press machine of a production facility that manufactures various products having different sizes.

    A press machine A for carrying out the drawing shown in FIG. 16 includes a lower die (punch) E mounted on the bed B and an upper die (die) U mounted on the slide S, and the bed B Is provided with a blank holder H that is moved up and down via a cushion rod R by a die cushion device C installed inside.

  The die cushion device C includes a cushion pad Cp provided in the bed B so as to be movable up and down, and a hydraulic servo cylinder Cs for moving the cushion pad Cp up and down. When processing, the material W is pressed against the upper mold U with a predetermined pressure through the blank holder H, thereby preventing the product from being “cracked” or “wrinkled”.

  Further, the die cushion device C is based on the position information of the blank holder H and the pressure information with respect to the material W, and the solid line (die cushion motion) is accompanied by the motion (broken line) of the slide S (upper die U) as shown in FIG. ), The operation is controlled in the order of preliminary acceleration stroke a, throttle stroke b, auxiliary lift c, locking d, and the like.

  Note that the die cushion device of the press machine is not used only as a driving means for the blank holder, but is a shock absorber and product associated with various press processes such as “bending” and “punch” including “drawing”. Needless to say, it is also used as a push-up device.

  Here, the above-mentioned prior art known to the applicant is a publicly known / public technique and does not relate to a known literature invention, and therefore there is no prior art document information to be described.

    By the way, automobile bodies are listed as representative products that are manufactured using a lot of press processing. However, because there are a wide variety of panels that make up a single automobile, the production facilities are quite large. I was jealous of the problem.

  That is, as shown in FIGS. 18 (a) to 18 (c), the panels constituting one automobile are class A panels (large products) Pa such as roof panels and floor pans, and class B such as door panels and hood panels. Panels (medium-sized products) Pb and class C panels (small products) Pc such as various pillars and cross members, etc., are broadly classified into three types. Is manufactured in a press working line (tandem press line) PLa juxtaposed via the B, and the class B panel Pb is a press working line (tandem press line) PLb in which a plurality of specialized press machines Ab are juxtaposed via the work loader T In addition, the class C panel Pc is applied to a press processing line (tandem press line) PLc in which a plurality of specialized press machines Ac are juxtaposed via a work loader T. Manufactured.

  Thus, in the conventional production equipment, class A panel Pa, class B panel Pb and class C panel Pc are manufactured by press machine Aa, press machine Ab, and press machine Ac specialized in each, In order to manufacture all the panels constituting one automobile, a plurality of press processing lines are required, and the inconvenience of incurring a large-scale production facility cannot be avoided.

  An object of the present invention is to provide a press machine capable of manufacturing a plurality of types of products having different sizes in a single press machine in view of the above-described actual situation, and thereby achieving downsizing of production equipment. It is providing the die-cushion apparatus of.

    In order to achieve the above object, a die cushion device for a press machine according to the invention of claim 1 is configured such that a die cushion unit including a cushion pad and a lift driving means for moving the cushion pad up and down is orthogonal to the workpiece conveyance direction. It is characterized by being arranged in the bed in parallel along the direction.

  According to a second aspect of the present invention, there is provided a die cushion device for a press machine according to the first aspect of the present invention, wherein the plurality of die cushion units can be controlled independently of each other. It is characterized by comprising.

  Furthermore, the die cushion device of the press machine according to the invention of claim 3 is the die cushion device of the press machine according to the invention of claim 2, with respect to the plurality of die cushion units that work on a common workpiece. It is characterized by controlling operations in synchronization with each other.

    According to the die cushion device of the press machine related to the invention of claim 1, a plurality of types of products having different sizes can be obtained by arranging a plurality of die cushion units in parallel along a direction orthogonal to the workpiece conveying direction. It is possible to manufacture on a single press machine.

  Furthermore, according to the die cushion apparatus of the present invention, a plurality of types of products having different sizes can be manufactured in a single press machine, so that the production facility for manufacturing a wide variety of types of products can be made as small as possible. Can also be achieved.

  Further, according to the die cushion device of the press machine according to the invention of claim 2, since the die cushion unit is provided with the control means capable of independently controlling the operation of the die cushion unit, a separate workpiece is provided in each die cushion unit. It becomes possible to make it a work target or to make only a specific die cushion unit function.

  Further, according to the die cushion device of the press machine according to the invention of claim 3, since the plurality of die cushion units that work on a common workpiece can be controlled in synchronization with each other, It becomes possible to mold a workpiece having a size that straddles the die cushion unit.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
1 to 4 show an example in which the die cushion device according to the present invention is applied to a press machine for processing a metal material (workpiece) into a panel having a desired shape, for example, in an automobile production facility. Note that the overall configuration of the press machine is basically the same as that of the conventional press machine A shown in FIG.

  As shown in FIGS. 1 to 3, a base (bed) 2 of a press machine 1 installed on a floor has a first unit (die cushion unit) 11 and a second unit (die cushion unit) constituting a die cushion device 10. ) 12, a third unit (die cushion unit) 13 and a fourth unit (die cushion unit) 14 are installed.

  The first unit 11 includes a cushion pad 11P having a rectangular plane, and a pair of hydraulic servo cylinders 11S and 11S which are lifting drive means for moving the cushion pad 11P up and down.

  Further, the cushion pad 11P is accommodated in one of the four partitions of the peripheral wall 2A of the base 2 by the partition wall 2B, and the base guide g and the pad liner l are brought into sliding contact with the base 2 by sliding. And can be moved up and down.

  Further, the pair of hydraulic servo cylinders 11S and 11S is fixed to a beam 2C installed inside the base 2, and the oil passages of one hydraulic servo cylinder are connected to each other by connecting the oil passages with the pipes 11p and 11p. Thus, it is configured to operate synchronously.

  Needless to say, the hydraulic servo cylinder 11S has a structure capable of appropriately changing the pressure foot pressure, stroke, locking position, etc., like the hydraulic servo cylinder in the conventional die cushion device.

  Similarly to the first unit 11 described above, the second unit 12 includes a cushion pad 12P having a rectangular plane, and a pair of hydraulic servo cylinders 12S and 12S. The cushion pad 12P includes a base 2 The pair of hydraulic servo cylinders 12S, 12S is configured to operate like a single hydraulic servo cylinder.

  Similarly to the first unit 11 described above, the third unit 13 includes a cushion pad 13P having a rectangular plane, and a pair of hydraulic servo cylinders 13S and 13S. The cushion pad 13P includes: The pair of hydraulic servo cylinders 13S and 13S are accommodated and installed in one section of the base 2 so as to be movable up and down, and are configured to operate like one hydraulic servo cylinder.

  Further, the fourth unit 14 also includes a cushion pad 14P having a rectangular plane and a pair of hydraulic servo cylinders 14S and 14S, similar to the first unit 11 described above. The pair of hydraulic servo cylinders 14S and 14S are accommodated and installed in one section of the base 2 so as to be movable up and down, and are configured to operate like one hydraulic servo cylinder.

  Here, the first unit 11, the second unit 12, the third unit 13, and the fourth unit 14 are juxtaposed in a direction orthogonal to the workpiece conveyance direction (direction perpendicular to the paper surface in FIG. 1). Thereby, the cushion pads 11P, 12P, 13P, and 14P in each of the units 11 to 14 are arranged in such a manner that a large die cushion pad is divided into four in a direction orthogonal to the workpiece conveyance direction.

  That is, the first unit 11, the second unit 12, the third unit 13, and the fourth unit 14 are laid out in a position mode that is simultaneously used in one step of press working, and further, the workpiece conveyance direction The material / product is laid out at the same time by a work transfer device such as a vacuum cup extending in a direction orthogonal to the direction.

  On the other hand, the die cushion device 10 operates to control the operation of the first unit 11, the second unit 12, the third unit 13, and the fourth unit 14 independently of each other or in synchronization with each other as described in detail later. A control unit (control means) 20 is provided.

  The operation control unit 20 includes a first control unit 21 that controls the first unit 11 independently. In the first control unit 21, as in the conventional die cushion device, position information and pressure information. Based on the above, the operation of the first unit 11 is controlled by the intended die cushion motion (see FIG. 17).

  Further, the operation control unit 20 independently controls the second control unit 22 that controls the second unit 12 independently, the third control unit 23 that controls the third unit 13 independently, and the fourth unit 14. The second control unit 22 to the fourth control unit 24 control the second unit 12 to the fourth unit 14 in the same manner as the first control unit 21 with the position information and pressure. Based on the information, the operation is controlled by a desired die cushion motion (see FIG. 17).

  The operation control unit 20 has an overall control unit 25 together with the first control unit 21 to the fourth control unit 24 described above. The overall control unit 25 is input from the operation panel 26 of the press machine 1 or the like. By outputting command signals to the first control unit 21 to the fourth control unit 24, as will be described later, on the basis of the working status, the first unit 11, the second unit 12, the third unit 13, and the fourth unit 14 are output. In addition to supervising independent operation control, the first unit 11 to the fourth unit 14 are controlled in synchronization with each other in any combination.

  By the way, in the press machine 1 described above, work is performed on class A panels such as roof panels that are large products, class B panels such as door panels that are medium products, and class C panels such as cross members that are small products. When the work target is a class A panel Pa as shown in FIG. 5A, all of the first unit 11 to the fourth unit 14 manufacture a common class A panel Pa. It will be offered to.

  Further, when the work target is a class B panel Pb as shown in FIG. 5B, the first unit 11 and the second unit 12, and the third unit 13 and the fourth unit 14 which are adjacent to each other are common. In other words, a total of two class B panels Pb and Pb are manufactured.

  Further, when the work target is a class C panel Pc as shown in FIG. 5C, all of the first unit 11 to the fourth unit 14 are used for the production of one class C panel Pc. Therefore, a total of four C-class panels Pc, Pc, Pc, and Pc are manufactured.

  Here, FIG. 1 and FIG. 4 show an embodiment when a C-class panel (small product) Pc is a work object as shown in FIG. 5C, and the first unit 11 is provided on the base 2 of the press machine 1. The lower mold L1, the lower mold L2, the lower mold L3, and the lower mold L4 are installed through the bolster 3 in the upper area of the second unit 12, the third unit 13, and the fourth unit 14, respectively.

  In addition, a blank holder is provided above the first unit 11, the second unit 12, the third unit 13, and the fourth unit 14 via cushion pins CP1, cushion pins CP2, cushion pins CP3, and cushion pins CP4. H1, blank holder H2, blank holder H3, and blank holder H4 are installed.

  On the other hand, the slide 4 of the press machine 1 includes an upper die U1, an upper die U2, and an upper die at positions facing the lower die L1, the lower die L2, the lower die L3, and the lower die L4. A mold U3 and an upper mold U4 are mounted.

  Below, in the press machine 1 of the structure mentioned above, the operation control with respect to the 1st unit 11-the 4th unit 14 at the time of manufacturing the Class A panel Pa, the Class B panel Pb, and the Class C panel Pc shown in FIG. One aspect will be described with reference to FIGS. 1 and 4 showing an overall image of the die cushion device 10.

  In the press machine 1 having the above-described configuration, when four C-class panels Pc having the same shape (see FIG. 5) are manufactured at the same time, the first unit 11 to the fourth unit 14 in the bed 2 as shown in FIG. In the upper region, lower molds L1 to L4 and blank holders H1 to H4 are installed, and upper molds U1 to U4 corresponding to the lower molds L1 to L4 are installed on the slide 4, and each class has a C class. The material Wc of the panel Pc is supplied.

  The operation control unit 20 of the die cushion device 10 is based on the work status (“4 C class panels”, “C class panel specifications”, etc.) input from the operation panel 26. The operation of the four units 14 is controlled by the first control unit 21 to the fourth control unit 24 independently of each other with an intended die cushion motion (see FIG. 17) corresponding to the specifications of the class C panel Pc.

  By the way, as shown in FIG. 7, prismatic heel guides La and heel guides Ua project from the four corners of the lower mold L1 and the upper mold U1, and the guide recesses Ha at the four corners of the blank holder H1 form the heel guide Ua. The blank holder H1 moves up and down relative to the lower mold L1 while being guided by the heel guide Ua.

  The hydraulic servo cylinders 11S and 11S of the first unit 11 for moving the blank holder H1 up and down are juxtaposed along the workpiece transfer direction as shown in FIG. 3, but are connected to each other by the pipes 11p and 11p as described above.恰 also operates like a single hydraulic servo cylinder. A structure in which one hydraulic servo cylinder is provided may be used.

  On the other hand, in the press machine 1 having the above-described configuration, when two B-class panels Pb (see FIG. 5) are manufactured simultaneously, the first unit 11 and the second unit 12 in the bed 2 as shown in FIG. The lower mold L11 and the lower mold L12, the blank holder H11 and the blank holder H12 are installed in the upper area and the upper area of the third unit 13 and the fourth unit 14, respectively, and the lower mold L11 and the lower mold are mounted on the slide 4. The upper mold U11 and the upper mold 12 corresponding to 12 are installed, and the material Wb of the class B panel Pb is supplied to each mold.

  The operation control unit 20 of the die cushion device 10 receives the work status input from the operation panel 26 (“manufactures two class B panels”, “material common to the first unit 11 and the second unit 12). ”,“ Specify materials common to the third unit 13 and the fourth unit 14 ”,“ specifications of the class B panel ”, etc.), the first unit 11, the second unit 12, and the The operation of the 3 unit 13 and the fourth unit 14 is controlled by an intended die cushion motion (see FIG. 17) corresponding to the specification of the class B panel Pb.

  Here, in the operation control unit 20, the first unit 11 and the second unit 12 used for manufacturing one of the class B panels Pb are controlled in synchronization with each other, and the other class B panel Pb is controlled. The third unit 13 and the fourth unit 14 used for manufacturing are controlled in synchronization with each other.

  That is, the first unit 11 and the second unit 12 are controlled in operation based on a command signal from the first control unit 21, and based on a feedback signal accompanying the operation of the first unit 11. The operation of the second unit 12 is controlled in synchronization with each other by a so-called master / slave control method.

  Similarly, in the third unit 13 and the fourth unit 14, the operation of the third unit 13 is controlled based on a command signal from the third control unit 23, and based on a feedback signal accompanying the operation of the third unit 13. The operation of the fourth unit 14 is controlled in synchronism with each other by a so-called master / slave control method.

  As described above, the first unit 11 and the second unit 12 and the third unit 13 and the fourth unit 14 are controlled in synchronization with each other, so that the blank holder H11 and the blank holder H12 are moved in the workpiece conveyance direction. In the orthogonal direction, it moves up and down without any inclination, thereby preventing the mold apparatus from being damaged due to the inclination of the blank holder.

  It should be noted that either the first unit 11 or the second unit 12 having a common material Wb as a work target is set as a master for operation control, or the third unit 13 and the fourth unit having a common material Wb as a work target. Of course, it is possible to appropriately set which of 14 and 14 is the operation control master in consideration of various conditions.

  On the other hand, in the press machine 1 having the above-described configuration, when one A-class panel Pa (see FIG. 5) is manufactured, the first unit 11 to the fourth unit 14 in the bed 2 as shown in FIG. In the upper region, one lower mold L20 and one blank holder H20 are installed, and an upper mold U20 corresponding to the lower mold L20 is installed on the slide 4 to supply the material Wa of the class A panel Pa.

  The operation control unit 20 of the die cushion device 10 uses the work status (“manufacture one class A panel”, “material common to the first unit 11 to the fourth unit 14) input from the operation panel 26 as the work target. The first unit 11, the second unit 12, the third unit 13, and the fourth unit 14 are connected to the expected die corresponding to the specifications of the class A panel Pa. Operation is controlled by cushion motion (see FIG. 17).

  Here, the operation control unit 20 controls the operations of the first unit 11, the second unit 12, the third unit 13, and the fourth unit 14 in synchronization with each other.

  That is, in the first unit 11 to the fourth unit 14, the operation of the first unit 11 is controlled based on the command signal from the first control unit 21, and based on the feedback signal accompanying the operation of the first unit 11. The operations of the second unit 12, the third unit 13, and the fourth unit 14 are controlled in synchronism with each other by a so-called master / slave control method.

  As described above, the first unit 11, the second unit 12, the third unit 13, and the fourth unit 14 are controlled to operate in synchronization with each other, so that the blank holder H20 is in a direction orthogonal to the workpiece conveyance direction. Therefore, the die moves up and down without any inclination, and thus the mold apparatus is prevented from being damaged due to the inclination of the blank holder.

  Needless to say, which of the first unit 11 to the fourth unit 14 that uses the common material Wa as a work target can be appropriately set in view of various conditions.

  Thus, according to the press machine 1 which employ | adopted the die-cushion apparatus 10 in connection with this invention, separate material (workpiece | work) is made into a work object in each die-cushion unit of the 1st unit 11-the 4th unit 14. FIG. Alternatively, by combining a plurality of die cushion units and using a common material (work) as a work target, a plurality of types of products having different sizes can be manufactured in one press machine 1.

  Further, according to the die cushion device 10 having the above-described configuration, a plurality of types of products having different sizes can be manufactured by one press machine 1, and therefore, production equipment for manufacturing a wide variety of types of products is possible. It is possible to achieve downsizing.

  By the way, as shown in FIG. 10A, when manufacturing four C-class panels Pc1, Pc2, Pc3, and Pc4 having greatly different shapes (specifications), the lower molds L1 to L4 shown in FIG. The blank holders H1 to H4 and the upper molds U1 to U4 correspond to the C class panels Pc1 to Pc4, respectively, and the materials Wc, Wc, Wc, and Wc of the C class panels Pc1 to Pc4 are assigned to individual molds. Supply.

  The operation control unit 20 of the die cushion device 10 makes the first unit 11 to the fourth unit 14 independent of each other by the first control unit 21 to the fourth control unit 24 based on the work situation input from the operation panel 26. The operation is controlled by the expected die cushion motion (see FIG. 17) corresponding to the specifications of the class C panel Pc.

  That is, the first unit 11 to the fourth unit 14 are independently controlled in accordance with the presser foot pressure, stroke, operation timing and the like corresponding to the specifications of the C class panels Pc1 to Pc4.

  In particular, considering the removal of the product by a workpiece transfer device such as a vacuum cup, each blank holder H1 to H4 has a desired shape according to the shape of the product, regardless of the stroke difference caused by the depth of the diaphragm. The rising speeds of the first unit 11 to the fourth unit 14 are controlled so that the timing of reaching the lift rising end is the same.

  Thus, in the press machine 1 employing the die cushion device 10 according to the present invention, a plurality of products of the same type (class B panel, class C panel) and having greatly different shapes (specifications) are processed in the same process. At the same time.

  On the other hand, when two C-class panels Pc and Pc and one B-class panel Pb are manufactured as shown in FIG. 10 (b), the lower molds L1 and L2, blank holders H1 and H2 as shown in FIG. And upper molds U1 and U2 are installed, and as shown in FIG. 8, a lower mold L12, a blank holder H12, and an upper mold U12 are installed, and class C is placed between the lower molds L1 and L2 and the upper molds U1 and U2. The materials Wc and Wc for the panel Pc are supplied, and the material Wb for the class B panel Pb is supplied between the lower mold L12 and the upper mold U12.

  The operation control unit 20 of the die cushion device 10 makes the first unit 11 and the second unit 12 independent of each other by the first control unit 21 and the second control unit 22 based on the work situation input from the operation panel 26. The operation of the die cushion motion (see FIG. 17) corresponding to the specifications of the class C panel Pc is controlled, and the third unit 13 and the fourth unit 14 used for manufacturing the class B panel Pb are The operation is controlled by the expected die cushion motion (see FIG. 17) corresponding to the specifications of the class B panel Pb in synchronization with each other.

  In addition, the operation control unit 20 considers the removal of the product by a work transfer device such as a vacuum cup, and the blank holders H1 to H4 have the shape of the product regardless of the stroke difference caused by the depth of the diaphragm. The ascending speeds of the first unit 11 to the fourth unit 14 are controlled so that the timing of reaching the desired lift ascending end according to the above is the same.

  As described above, in the press machine 1 employing the die cushion device 10 according to the present invention, it is possible to simultaneously manufacture a plurality of types of products (B class panel, C class panel) having different sizes in the same process. It is.

  Further, as shown in FIG. 11 (a), when manufacturing one class B panel Pb, a lower mold L11, a blank holder H11, and an upper mold U11 are installed as shown in FIG. The material Wb for the class B panel is supplied between U11 and U11.

  The operation control unit 20 of the die cushion device 10 synchronizes the second unit and the third unit used for manufacturing the class B panel Pb with each other based on the work situation input from the operation panel. The operation is controlled by the expected die cushion motion (see FIG. 17) corresponding to the specifications.

  Furthermore, as shown in FIG. 11 (b), when two C-class panels Pc and Pc are manufactured, lower molds L2 and L3, blank holders H2 and H3, and upper molds U2 and U3 are installed as shown in FIG. Then, the material Wc for the class C panel Pc is supplied between the lower molds L2, L3 and the upper molds U2, U3.

  The operation control unit 20 of the die cushion device 10 converts the second unit and the third unit used for manufacturing the C-class panel Pc into the second control unit 22 and the third control based on the work situation input from the operation panel. By the unit 23, the operation is controlled independently of each other by an intended die cushion motion (see FIG. 17) corresponding to the specifications of the class C panel Pc.

  Thus, in the press machine 1 which employ | adopted the die cushion apparatus 10 in connection with this invention, it is also possible not to use a specific die cushion unit. It is also possible to freely set which die cushion unit to select. Needless to say, the eccentric load generated during machining should be selected to be as small as possible.

  Here, in the above-described embodiments, the operation of the plurality of die cushion units having the same material as the work object is controlled to be synchronized with each other by the master / slave control method. It goes without saying that various existing configurations can be appropriately adopted as a configuration for embodying the control method in FIG.

  In addition, as a method of controlling the operation of a plurality of die cushion units in synchronization with each other, not only the master / slave type control method illustrated in the embodiment but also various existing control methods can be effectively applied. Of course.

  Furthermore, in the above-described embodiment, the example in which the raising / lowering driving means of the die cushion unit in the die cushion device is configured by a hydraulic servo cylinder has been described. However, the die cushion unit of the die cushion unit is appropriately driven by an appropriate driving means such as an electric servo motor. It is also possible to constitute a lifting drive means.

  FIG. 12 is a schematic view showing another embodiment of the die cushion unit. In this die cushion unit 100, the cushion pad 101 includes a ball screw 102, a connecting member 103, a large pulley 104, a belt 105, and a small pulley 106. The ball screw 102, the connecting member 103, the large pulley 104, the belt 105, the small pulley 106, and the electric servo motor 107 constitute an elevating drive unit 110.

  Each side surface of the cushion pad 101 is provided with pad liners l, l... That are in sliding contact with a base guide provided on a base (bed) of a press machine (not shown).

  A nut portion 102a of the ball screw 102 is fixed to a lower portion of the cushion pad 101, a screw portion 102b of the ball screw 102 is screwed to the nut portion 102a, and a lower portion of the screw portion 102b is connected to the connecting member 103. ing. Further, the connecting member 103 is supported by a bearing or the like with respect to the beam 108 in the base, and a large pulley 104 is provided below the connecting member 103. A small pulley 106 is provided on the rotating shaft of the electric servo motor 107, and a belt 105 is wound around the large pulley 104 and the small pulley 106.

  The small pulley 106, the large pulley 104, the connecting member 103, and the screw portion 102b rotate along with the rotation of the rotating shaft in the electric servo motor 107, and the nut portion 102a changes to the screw portion 102b along with the rotating operation of the screw portion 102b. The cushion pad 101 moves up and down together with the nut portion 102a by linearly moving in the vertical direction along the vertical direction.

  In the above-described die cushion unit 100, the cushion pad 101 is controlled in the same manner as the hydraulic servo cylinder in the conventional die cushion device by controlling the current of the operation (rotation of the rotating shaft) of the electric servo motor 107 constituting the lifting drive means 110. It is possible to appropriately control the operation (pressing pressure, stroke, locking position, etc.).

  FIG. 13 is a schematic view showing another embodiment of the die cushion unit. In this die cushion unit 200, the cushion pad 201 includes a ball screw 202, a connecting member 203, a large pulley 204, a belt 205, and a small pulley 206. The ball screw 202, the connecting member 203, the large pulley 204, the belt 205, the small pulley 206, and the electric servomotor 207 constitute an elevating drive unit 210.

  Each side surface of the cushion pad 201 is provided with pad liners l, l... That are in sliding contact with a base guide provided on a base (bed) of a press machine (not shown).

  A threaded portion 202b of a ball screw 202 is fixed to the lower portion of the cushion pad 201, and a nut portion 202a of the ball screw 202 is screwed to the threaded portion 202b, and a lower portion of the nut portion 42b is connected to the connecting member 47. It is connected. Further, the connecting member 203 is supported by a bearing or the like with respect to the beam 208 in the base, and a large pulley 204 is provided below the connecting member 203. A small pulley 206 is provided on the rotating shaft of the electric servo motor 207, and a belt 205 is wound around the large pulley 204 and the small pulley 206.

  The small pulley 206, the large pulley 204, the connecting member 203, and the nut portion 202a are rotated along with the rotation of the rotating shaft of the electric servo motor 207, and the screw portion 202b is moved to the nut portion 202a along with the rotating operation of the nut portion 202a. The cushion pad 201 moves up and down together with the threaded portion 202b by linearly moving in the vertical direction along the vertical direction.

  In the above-described die cushion unit 200 as well, the cushion pad 201 is controlled in the same manner as the hydraulic servo cylinder in the conventional die cushion device by controlling the current of the operation (rotation of the rotating shaft) of the electric servo motor 207 constituting the elevation driving means 210. It is possible to appropriately control the operation (pressing pressure, stroke, locking position, etc.).

  FIG. 14 is a schematic view showing another embodiment of the die cushion unit. In this die cushion unit 300, the cushion pad 301 is further connected to the ball screw 302, the connecting member 303, and the like via the plunger rod 311 and the piston 312. The pulley 304, the belt 305, and the small pulley 306 are connected to the rotating shaft of the electric servo motor 307. These plunger rod 311, piston 312, ball screw 302, connecting member 303, large pulley 304, belt 305, small The pulley 306 and the electric servo motor 307 constitute a lifting drive means 310.

  A columnar plunger rod 311 is fixed to the lower portion of the cushion pad 301, and this plunger rod 311 is slidably supported by a cylindrical plunger guide 313 fixed to a beam 308 in the base. Yes. The plunger rod 311 moves up and down while being supported by the plunger guide 313, so that the plunger guide 313 guides the plunger rod 311 and the cushion pad 301 connected to the plunger rod 311 in the up and down direction.

  A cylinder 311a having an opening in the downward direction is formed in the lower portion of the plunger rod 311. A piston 312 is slidably accommodated in the cylinder 311a. A hydraulic chamber 314 is formed, and the hydraulic chamber 314 is filled with pressure oil.

  The hydraulic chamber 314 has the same axial center as that of the plunger rod 311 and the ball screw 302, and the pressure oil port of the hydraulic chamber 314 is connected to a hydraulic circuit (not shown). Pressure oil is exchanged between the two. The pressure oil in the hydraulic chamber 314 reduces the impact generated when the upper mold and the work come into contact with each other, and is discharged to a tank (not shown) when the hydraulic pressure exceeds a predetermined value, thereby protecting the overload. Demonstrate the function.

  The lower end of the piston 312 is in contact with the upper end of the threaded portion 302b of the ball screw 302. A spherical concave surface 312a is formed at the lower end of the piston 312. The upper end of the threaded portion 302b facing the concave surface 312a is A spherical convex surface 302c is formed. Incidentally, a convex surface may be formed at the lower end of the piston 312 and a concave surface may be formed at the upper end of the screw portion 302b.

  Here, the rod-shaped member such as the screw portion 302b is strong against the axial force acting on the end portion, but is weak against the bending moment, but if the upper end of the screw portion 302b has a spherical shape, it is temporarily cushioned. Even when the pad 301 is inclined and a bending moment is generated at the upper end of the threaded portion 302b, only the axial force acts on the entire threaded portion 302b, and damage to the threaded portion 302b due to the eccentric load can be prevented.

  A nut portion 302 a is screwed into the screw portion 302 b of the ball screw 302, and a lower portion of the nut portion 302 b is connected to a connecting member 303. Further, the connecting member 303 is supported by a bearing or the like with respect to the beam 308 in the base, and a large pulley 304 is provided below the connecting member 303. A small pulley 306 is provided on the rotating shaft of the electric servo motor 307, and a belt 305 is wound around the large pulley 304 and the small pulley 306.

  The small pulley 306, the large pulley 304, the connecting member 303, and the nut portion 302a rotate as the rotating shaft of the electric servo motor 307 rotates, and the screw portion 302b moves to the nut portion 302a as the nut portion 302a rotates. The cushion pad 301 moves up and down together with the threaded portion 302b, the piston 312 and the plunger rod 311 by linearly moving in the vertical direction along the vertical direction.

  In the above-described die cushion unit 300 as well, the cushion pad 301 is controlled in the same manner as the hydraulic servo cylinder in the conventional die cushion device by controlling the current of the operation (rotation of the rotation shaft) of the electric servo motor 307 that constitutes the lifting drive means 310. It is possible to appropriately control the operation (pressing pressure, stroke, locking position, etc.).

  FIG. 15 is a schematic view showing another embodiment of the die cushion unit. In this die cushion unit 400, the cushion pad 401 is further connected to a ball screw 402, a connecting member 403, and a cup via a plunger rod 411 and a piston 412. The plunger 411, the piston 412, the ball screw 402, the connecting member 403, the coupling 421, the speed reducer 422, and the electric servo motor are connected to the rotating shaft of the electric servo motor 407 via a ring 421 and a speed reducer 422. Ascending / descending driving means 410 is constituted by 407.

  An electric servo motor 407 is installed in a lower region of the connecting member 403, and a speed reducer 422 is connected to the rotating shaft of the electric servo motor 407. Note that the electric servo motor 407 may include a reduction gear.

  The output shaft of the speed reducer 422 is connected to the lower part of the connecting member 403 via a coupling 421. The output shafts of the ball screw 402, the connecting member 403, the coupling 421, and the speed reducer 422 are coaxial. positioned. Further, depending on the structure of the speed reducer 422, the rotating shaft of the electric servo motor 407 is also positioned coaxially with the ball screw 402 and the like.

  Here, the die cushion unit 400 is basically the same as the die cushion unit 300 described above except for the layout of the electric servo motor 407 with respect to the connecting member 403 and the power transmission mechanism from the electric servo motor 407 to the connecting member 403. Since the structure is the same, in the components of the die cushion unit 400, the same functions as those of the die cushion unit 300 will be described in detail by attaching the same reference numerals as in FIG. Description is omitted.

  In the die cushion unit 400, the gear and the like in the speed reducer 422 rotate with the rotation of the rotating shaft in the electric servo motor 407, and the output shaft, the coupling 421, the connecting member 403, and the nut portion 402a of the speed reducer 422 are connected. As the nut portion 402a rotates, the screw portion 402b linearly moves along the nut portion 402a in the vertical direction, that is, in the up-and-down direction, so that the cushion portion together with the screw portion 402b, the piston 412, and the plunger rod 411 is cushioned. The pad 401 moves up and down.

  In the above-described die cushion unit 400 as well, the cushion pad 401 is controlled in the same manner as the hydraulic servo cylinder in the conventional die cushion device by controlling the current of the operation (rotation of the rotation shaft) of the electric servo motor 407 constituting the lifting drive means 410. It is possible to appropriately control the operation (pressing pressure, stroke, locking position, etc.).

  In the above-described embodiment, an example in which the present invention is applied to a press machine for constructing an automobile production facility has been shown. However, the die cushion device according to the present invention is not limited to an automobile production facility, but various products. Needless to say, the present invention can be effectively applied to a press machine that constructs a production facility.

BRIEF DESCRIPTION OF THE DRAWINGS The conceptual cross-sectional front view which shows one Example of the die cushion apparatus of the press machine in connection with this invention. The principal part top view which shows one Example of the die cushion apparatus in connection with this invention. The III-III sectional view taken on the line in FIG. 2 which shows one Example of the die cushion apparatus in connection with this invention. The block diagram of the control system in the die-cushion apparatus shown in FIG. (a), (b), (c) is a conceptual top view which shows the corresponding | compatible condition of the die cushion apparatus with respect to various products. The conceptual diagram which shows the structure of the die cushion apparatus in the case of manufacturing a small product. The external appearance perspective view which shows the structure of a general metal mold | die. The conceptual diagram which shows the structure of the die cushion apparatus in the case of manufacturing medium size product. The conceptual diagram which shows the structure of the die-cushion apparatus in the case of manufacturing a large sized product. (a), (b) is a conceptual top view which shows the correspondence condition of the die cushion apparatus with respect to various products. (a), (b) is a conceptual top view which shows the correspondence condition of the die cushion apparatus with respect to various products. The schematic diagram which shows the other Example of the die cushion unit in the die cushion apparatus of this invention. The schematic diagram which shows the other Example of the die cushion unit in the die cushion apparatus of this invention. The schematic diagram which shows the other Example of the die cushion unit in the die cushion apparatus of this invention. The schematic diagram which shows the other Example of the die cushion unit in the die cushion apparatus of this invention. The whole conceptual diagram which shows the conventional press machine. The operation diagram which shows the mode of the motion in a die cushion apparatus. The conceptual top view which shows the press work line constructed | assembled using the conventional press machine.

Explanation of symbols

1 ... Press machine,
2 ... Bed (bed frame),
10 ... Die cushion device,
11 ... 1st unit (die cushion unit),
11P ... cushion pad,
11S: Hydraulic servo cylinder (lifting drive means),
12 ... Second unit (die cushion unit),
12P ... cushion pad,
12S: Hydraulic servo cylinder (lifting drive means),
13 ... Third unit (die cushion unit),
13P ... Cushion pad
13S: Hydraulic servo cylinder (lifting drive means),
14 ... Fourth unit (die cushion unit),
14P ... cushion pad,
14S: Hydraulic servo cylinder (lifting drive means),
20 ... Operation control unit (control means),
21 ... 1st control part,
22 ... second control unit,
23. Third control unit,
24. Fourth control unit,
25 ... Overall control unit,
U1, U2, U3, U4, U11, U12, U20 ... Upper mold,
L1, L2, L3, L4, L11, L12, L20 ... lower mold,
H1, H2, H3, H4, H11, H12, H20 ... Blank holder,
Pa, Pa1, Pa2, Pa3, Pa4 ... Class A panel,
Pb ... B class panel,
Pc ... C class panel,
Wa, Wb, Wc ... material (work),
100, 200, 300, 400 ... die cushion unit,
101, 201, 301, 401 ... cushion pad,
107, 207, 307, 407 ... electric servo motor,
110, 210, 310, 410: lifting drive means.

Claims (3)

A die cushion device for a press machine,
A die for a press machine, comprising: a plurality of die cushion units each including a cushion pad and a lifting drive means for moving the cushion pad up and down in a bed in a direction orthogonal to a workpiece transfer direction. Cushion device. 2. The die cushion device for a press machine according to claim 1, further comprising control means capable of independently controlling the operation of the plurality of die cushion units. 3. The die cushion device for a press machine according to claim 2, wherein operation control is performed in synchronization with each other with respect to the plurality of die cushion units having a common workpiece as a work target.

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