JP2012055934A - Center sag adjusting device in press machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a center sag adjusting device in a press machine, capable of properly keeping the relative positional relation between an upper side die and a lower side die in pressing, and securing sufficient proof stress against pressure.SOLUTION: A center sag adjusting device 6 performs height-adjusting of an upper side die or a lower side die, for example an upper side die 4A. The die 4A is height-adjustably fixed to a support member 5, which supports the die 4A, with a die fixing means 7. Intermediate wedge means 8 are intervened at a plurality of points between the die 4A and the support member 5 in the lateral direction. The intermediate wedge means 8 has a cylindrical face 8b, which has the face brought into contact with the die 4A in an inclined state along the longitudinal direction and convexed/concaved to the die 4A side, and is made slidable in the longitudinal direction of the die 4A and in the circumferential direction along the cylindrical face. There is provided a longitudinal position changing means 21 for changing the longitudinal position of the intermediate wedge means 8.

Description

  This invention adjusts the height of the upper and lower molds in a press machine such as a press brake so that the upper mold and the lower mold can be pressed while maintaining an appropriate height relationship. The present invention relates to a sag control device.

  In a press brake, generally, a movable support member that supports a movable mold among the upper mold and the lower mold is moved up and down by lifting mechanisms provided on the left and right sides of the movable mold support member. In that case, the right and left central part of the movable mold support member bends in the opposite direction to the pressurizing direction during pressurization, and the height relationship between the upper mold and the lower mold becomes inappropriate. Arise. In order to prevent this, it is possible to configure the movable mold with a plurality of mold divisions divided in the left-right direction, and arrange the mold divisions in the left and right center in advance closer to the fixed mold. Has been done.

  The amount by which the mold divided body is brought close to the fixed mold depends on the thickness and material of the plate material to be processed. Therefore, an sag adjustment device is provided that individually adjusts the height of each mold division so as to be compatible with the plate material to be processed. As one method employed in this sag adjustment device, a wedge-shaped member inclined in the front-rear direction is interposed between the movable support member and the mold divided body, and the front-rear position of the wedge-shaped member is changed. There is a technique (for example, Patent Document 1) for adjusting the height of the mold division body. In addition, as a different method, an eccentric shaft having two shaft portions that are eccentric to each other is provided, a movable support member is attached to one shaft portion of the eccentric shaft, and a mold divided body is attached to the other shaft portion, There is a technique (for example, Patent Document 2) that adjusts the height of the mold divided body by changing the phase of the eccentric shaft.

Japanese Utility Model Publication No. 60-16420 Japanese Patent Publication No. 60-17610

  However, since the conventional method using the wedge-shaped member cannot adjust the posture of the mold divided body itself, when the height of each mold divided body is adjusted, as shown in FIG. 4A of division bodies will be in the state arrange | positioned at step shape. In this case, when the plate work W is bent by the movable die 4 and the fixed die 2, a portion that strongly contacts the plate workpiece W and a portion that weakly contacts the movable workpiece 4 are generated. Can not bend well. In the illustrated example, the movable mold is the upper mold, but the same applies to the case where the movable mold is the lower mold.

The method using the eccentric shaft does not have the above problem because it can adjust the posture of each mold divided body 4A, but has another problem described below.
An example of the movable support portion using the eccentric shaft is shown in FIG. In this movable mold support portion, the movable mold is the upper mold 4, and a pair of front and rear mounting plates 101 are attached to the lower end of the movable mold support member 100, and the upper end is supported between the front and rear mounting plates 101. An adjustment plate 102 is interposed in contact with the member 100, a holder 104 is attached to the lower end of the adjustment plate 102 via a connection plate 103, and the upper mold 4 is attached to the holder 104. The mounting plate 101 and the adjustment plate 102 are connected to each other by an eccentric shaft 105. That is, the shaft portions 105a on both sides of the eccentric shaft 105 are fitted in the shaft holes 101a formed in the front and rear mounting plates 101, respectively, and the central shaft portion 105b is fitted in the shaft holes 102a formed in the adjustment plate 102. is doing. By changing the phase of the eccentric shaft 105 while maintaining the state where the upper end of the adjustment plate 102 is in contact with the movable support member 100, the height of the pair of front and rear mounting plates 101 with respect to the adjustment plate 102 is changed. The height is changed.

  With this movable support structure, the force F acting on the movable support during bending is received at the contact portion between the shaft hole 101a of the mounting plate 101 and the shaft portion 105a of the eccentric shaft 105, and is further adjusted. It is received at the contact portion between the shaft hole 102 a of the plate 102 and the shaft portion 105 b of the eccentric shaft 105. Of these contact portions, the contact portion having the smaller contact area determines the proof stress against pressurization. Since each of the contact portions cannot have a large contact area, it is difficult to ensure a sufficient proof stress.

The object of the present invention is to properly maintain the relative positional relationship between the upper die and the lower die during press working, and to ensure sufficient resistance to pressurization. It is to provide a sag adjusting device for a press machine.
Another object of the present invention is to make it possible to keep the relative positional relationship between the upper die and the lower die during pressing more appropriately.
Still another object of the present invention is to reduce the height of the intermediate wedge member and to easily adjust the left and right positions.
Still another object of the present invention is to facilitate the operation of adjusting the relative positional relationship between the upper mold and the lower mold.

  The sag adjustment device of the press machine according to the present invention includes an upper mold and a lower mold that are long on the left and right sides, and is positioned between the upper and lower molds by relative vertical movement of the upper and lower molds. It is applied to a press machine that presses a plate material. The upper mold or the lower mold is fixed to a support member supporting the mold by a mold fixing means so that the height can be adjusted, and the height adjustable mold and its support member The surface in contact with the mold is inclined in the front-rear direction and is convex or concave on the mold side at a plurality of positions in the left-right direction between the front-rear direction and the circumferential direction along the cylindrical surface with respect to the mold Front / rear position changing means for interposing a slidable intermediate wedge member and changing the front / rear position of the intermediate wedge member is provided.

  Since the surface of the intermediate wedge member that is in contact with the mold is inclined in the front-rear direction, the vertical height of the mold changes when the front-rear position changing means changes the front-rear position of the intermediate wedge member. In addition, since the intermediate wedge member is a cylindrical surface with a convex or concave surface facing the mold, the mold is tilted by changing the position of the mold around the central axis of the cylindrical surface relative to the intermediate wedge member. Can be made. For these reasons, the relative positional relationship between the upper mold and the lower mold can be maintained appropriately. Regardless of the tilting posture of the mold, the intermediate wedge member and the mold are kept in contact with each other on the surface, so that it is possible to always ensure a sufficient proof strength against pressure.

The mold whose height can be adjusted may be an upper mold. In this case, the intermediate wedge member is interposed between the upper mold and the support member, and the upper mold is composed of a plurality of mold division bodies divided in the left-right direction, The cylindrical surfaces of the two intermediate wedge members are slidably contacted in the front-rear direction and in the circumferential direction along the cylindrical surface, respectively, on the cylindrical surface-shaped concave or convex portions provided on the left and right sides of the upper surface of the body. Is good.
By configuring the upper mold with a plurality of divided molds divided in the left-right direction, the relative positional relationship between the upper mold and the lower mold is adjusted for each part in the left-right direction. be able to. When the cylindrical surfaces of the two intermediate wedge members are in contact with the cylindrical concave portions or convex portions provided at two positions on the left and right sides of the upper surface of each mold divided body, the vertical position adjustment and inclination of each mold divided body You can adjust.

When it is set as the said structure, it is good for the said intermediate wedge member that the upper surface which is a surface on the opposite side to the said cylindrical surface is a horizontal surface.
When the upper surface of the intermediate wedge member is a horizontal plane, the height of the intermediate wedge member can be reduced. Further, when the upper surface is a horizontal plane, the intermediate wedge member can be easily slid to the left and right with respect to the support member of the upper mold, and the left and right positions of the intermediate wedge member can be easily adjusted.

The mold fixing means includes a fixing member that is fixed so that the position in the left-right direction can be changed in a state where the upper end is in contact with the vertical surface of the support member, and the mold divided body is fixed to the lower end. The fixing member is fixed to the support member by being pressed against the vertical surface by a pressing member from the opposite side of the vertical surface, and an upward step along the left-right direction on the vertical surface of the support member. In addition to providing a surface, it is preferable that the fixing member be provided with a catching portion for restricting the dropping of the fixing member by being caught on the stepped surface.
With this configuration, the left and right positions of the mold divided body can be adjusted by shifting the fixing member in the left-right direction in a state where the pressing by the pressing member is released. At this time, since the catching portion of the fixing member is caught on the stepped surface of the support member and the dropping of the fixing member is restricted, the left-right position adjustment operation is easily performed.

  The sag adjustment device of the press machine according to the present invention includes an upper mold and a lower mold that are long on the left and right sides, and is positioned between the upper and lower molds by relative vertical movement of the upper and lower molds. This is applied to a press machine that presses a plate material to be fixed, and the upper mold or the lower mold is fixed to a support member that supports the mold by a mold fixing means so that the height can be adjusted. At a plurality of positions in the left-right direction between the height-adjustable mold and its support member, the surface in contact with the mold is a cylindrical surface that is inclined in the front-rear direction and is convex or concave on the mold side. On the other hand, an intermediate wedge member that is slidable in the front-rear direction and the circumferential direction along the cylindrical surface is provided, and a front-rear position changing means for changing the front-rear position of the intermediate wedge member is provided. Keep the relative positional relationship between the mold and the lower mold properly Bets can be, it is possible to secure a sufficient strength against pressure.

  The intermediate wedge member is interposed between the upper mold and the support member, and the upper mold is composed of a plurality of mold divisions divided in the left-right direction, and an upper surface of each mold division In the case where the cylindrical surfaces of the two intermediate wedge members are slidably contacted in the front-rear direction and the circumferential direction along the cylindrical surface, respectively, on the cylindrical surface-shaped concave or convex portions provided at the two left and right sides of The relative positional relationship between the upper mold and the lower mold at the time of press working can be more appropriately maintained.

  When the intermediate wedge member has a horizontal plane on the upper surface opposite to the cylindrical surface, the intermediate wedge member can be easily lowered in height and adjusted in the left-right position.

  The mold fixing means includes a fixing member that is fixed so that the position in the left-right direction can be changed in a state in which the upper end is in contact with the vertical surface of the support member, and the mold divided body is fixed to the lower end. The member is fixed to the support member by being pressed against the vertical surface by a pressing member from the opposite side of the vertical surface, and an upward step surface along the left-right direction is provided on the vertical surface of the support member. In addition, when the hooking portion for restricting the dropping of the fixing member by being hooked on the step surface is provided on the fixing member, the relative positional relationship between the upper mold and the lower mold is determined. Adjustment work can be performed easily.

It is a front view of the press machine concerning one Embodiment of this invention. It is a top view of the press machine. It is a side view of the press machine. (A) is a front view of the upper mold | type support part of the press machine, (B) is the fracture | rupture side view. It is a front view which shows the state which isolate | separated the intermediate wedge member and upper mold | type holder of the same mold support part. (A) is the partially broken front view of the raising / lowering mechanism of the left side of the press machine, (B) is the side view. It is a hydraulic circuit diagram of the hydraulic drive system lifting mechanism of the press machine. It is a block diagram of a control apparatus. It is a front view which shows arrangement | positioning of each mold division body of an upper mold | type. The front view of the lower mold | type support part of a different press machine, (B) is the fracture | rupture side view. It is a front view which shows the position of the metal mold | die division body in the conventional press brake. It is sectional drawing of an example of the movable type support part of the conventional press brake.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a press machine according to this embodiment, FIG. 2 is a plan view thereof, and FIG. 3 is a side view thereof. This press machine is a press brake, on the front side of the main body frame 1, a table 3 as a fixed mold support member that supports a lower mold 2 that is a fixed mold, and an upper mold that is a movable mold. A ram 5 is provided as a movable support member that supports 4. The table 3 is fixed in position with respect to the main body frame 1, and the ram 5 can be moved up and down through the guide means 26 (FIGS. 2 and 3) on both left and right sides. The lower die 2 is an integral die that is long in the left-right direction and has a molding recess 2a (FIG. 3). The upper mold 4 has a tip portion 4a (FIG. 3) that enters the recess 2a of the lower mold 2 and is a mold that is long to the left and right like the lower mold 2. However, as shown in FIG. The plurality of divided mold bodies 4A. The upper die 4 is lowered with respect to the workpiece W made of a plate material placed on the lower die 2, and the tip portion 4a of the upper die 4 is caused to enter the concave portion 2a of the lower die 2, so that the workpiece W is V-shaped. Bend to.

  As shown in FIG. 2, the main body frame 1 includes a pair of left and right plate-like side frames 1a and a connecting frame 1b having a ladder shape that connects the upper portions of the left and right side frames 1a to each other. Become. As shown in FIG. 3, the left and right side frames 1 a are formed in a shape having a recessed portion 1 aa in which the upper and lower central portions of the front end are recessed rearward in order to avoid interference with the workpiece W having a wide left and right width during processing. Yes.

  The height of each mold division 4A of the upper mold 4 can be individually adjusted by the sag adjusting device 6 shown in FIG. The sagging adjustment device 6 is provided between the ram 5 and the mold fixing means 7 for fixing the mold divided bodies 4A so that the height can be adjusted, and between the ram 5 and the mold divided body 4A. An intermediate wedge member 8 for adjusting the angle is provided. In the illustrated example, the mold divided body 4A is held by the upper mold holder 10 having the same width as the mold divided body 4A, and the intermediate wedge member 8 adjusts the distance between the ram 5 and the upper mold holder 10. The mold divided body 4A is attached to the upper mold holder 10 with a pair of thin upper sections 4Aa of the mold divided body 4A overlapped on the front and rear sides of the thin lower section 10a of the upper mold holder 10 and arranged on both front and rear sides of the upper mold holder 10. The presser plate 11 is tightened with bolts 12, and the thin upper portion 4Aa of the mold divided body 4A is sandwiched between the rear presser plate 11 and the thin lower portion 10a of the upper mold holder 10.

  The mold fixing means 7 has a fixing member 13 having the same width as the upper mold holder 10 and having an upper end pressed against the lower end of the ram 5. The upper mold holder 10 is attached to the lower end of the fixing member 13. Fastened with bolts 14. The bolt hole 14a of the fixing member 13 through which the bolt 14 is inserted is a loose hole having an adjustment gap in the vertical direction with respect to the bolt diameter, for example, a long hole that is long in the vertical direction. The fixing support member 13 is fixed to the ram 5 by placing one surface at the upper end of the fixing support member 13 against the vertical surface 16 of the ram 5 and covering the other surface with a pressing member 17 having an L-shaped cross section. This is done by pressing the pressing member 17 against the vertical surface 16 by tightening with a bolt 18. On the vertical surface 16 of the ram 5, an upward step surface 16 a along the left-right direction is formed, and on the fixing member 13, a catch portion 13 a that is hooked on the step surface 16 a is formed.

  The intermediate wedge member 8 is provided by being fitted into the recesses 10b provided at two positions in the left-right direction on the upper surface of the upper mold holder 10. The concave portion 10b has a cylindrical surface shape whose central axis is inclined forward and backward. In the example shown in the figure, the central axis is rising forward, but the central axis may be falling forward. As shown in FIG. 5, the intermediate wedge member 8 has a cylindrical surface 8b whose upper surface is a horizontal surface 8a and whose lower surface is inclined in the front-rear direction corresponding to the concave portion 10b and is convex downward. The upper surface composed of the horizontal surface 8a is slidably in contact with the lower end surface of the ram 5, and the lower surface composed of the cylindrical surface 8b is slidably in contact with the inner peripheral surface of the recess 10b in the front-rear direction and the circumferential direction.

Front / rear position changing means 21 for changing the front / rear position of the intermediate wedge member 8 is provided. The front / rear position changing means 21 includes a screw hole 22 formed in the intermediate wedge member 8 along the front / rear direction, and a screw member 23 penetrating the fixing member 13 and screwing a screw portion 23a at the tip into the screw hole 22. Consists of. The front / rear position of the intermediate wedge member 8 is changed by changing the screwing amount of the screw member 23 into the screw hole 22. A mark 24 indicating the rotational position of the screw member 23 is provided on the head 23 b of the screw member 23. Further, on the front surface of the fixing member 13, a scale 25 indicating the phase in the circumferential direction is attached corresponding to the mark 25. A numerical value indicating the height position of the mold divided body 4 </ b> A according to the rotational position of the screw member 23 may be attached to the scale 25.
A method of adjusting the height of the mold divided body 4A will be described later.

  As shown in FIG. 2, the left and right sides of the ram 5 are supported by the guide means 26 so as to be movable up and down, and the left and right sides are driven up and down independently by left and right lifting mechanisms 27, respectively. Is done. The guide means 26 includes an elevating guide 26a that is provided on the side frame 1a of the main body frame 1 along the vertical direction, and a pair of rollers 26b that are provided on the back side of the ram 5 and roll on both front and rear surfaces of the elevating guide 26a. It becomes. The elevating mechanism 27 is a combination of a motor drive system elevating mechanism 30 using a servo motor as a drive source and a hydraulic drive system elevating mechanism 40 using a hydraulic actuator as a drive source. In each combination, the motor drive system elevating mechanism 30 is arranged on the left and right outside of the hydraulic drive system elevating mechanism 40.

  As shown in FIG. 6, the motor drive system elevating mechanism 30 converts the rotational motion of the servo motor 31 into a linear motion by the ball screw mechanism 32. The ball screw mechanism 32 includes a screw shaft 32a extending in the vertical direction and a nut 32b screwed to the screw shaft 32a via a built-in ball (not shown). The upper and lower ends of the screw shaft 32a are rotatably supported by an upper screw shaft support member 33 and a lower screw shaft support member 34 fixed to a cylinder tube 42 of a hydraulic cylinder 41 described later. The cylinder tube 42 is fixed to the main body frame 1. A nut 32b, which is a movable part of the motor drive system elevating mechanism 30, is slidable along a vertical linear motion guide 35 fixed to the cylinder tube 42. The nut 32 b is connected to a connecting plate 5 a provided on the left and right shoulders of the ram 5 through a pair of front and rear links 36.

  The screw shaft 32 a is connected to an output shaft (not shown) of the servo motor 31 on the upper end side so as to be able to transmit rotation, and is selectively rotated in both forward and reverse directions by driving the servo motor 31. As the screw shaft 32 a rotates, the nut 32 b moves up and down along the screw shaft 32 a, and the lifting and lowering of the nut 32 b is transmitted to the ram 5 via the link 36. The servo motor 31 is fixedly attached to the upper screw shaft support member 33.

  The hydraulic drive system lifting mechanism 40 includes a double-acting hydraulic cylinder 41 as a hydraulic actuator. The hydraulic cylinder 41 includes a first cylinder chamber which is fitted on a cylinder tube 42 fixed to the main body frame 1 so that a piston 43 can slide up and down, and on the both upper and lower sides of the piston 43 in the cylinder tube 42. 44 and a second cylinder chamber 45 on the top side are formed. The first cylinder chamber 44 and the second cylinder chamber 45 are respectively provided with ports P1 and P2 through which oil enters and exits. A piston rod 43a extends downward from the piston 43. A spherical concave portion 46 serving as a concave seat is formed on the front end surface of the piston rod 43a, and a spherical convex portion 47 whose upper surface provided on the connecting plate 5a of the ram 5 is in contact with the concave portion 46. ing. The recess 46 and the protrusion 47 constitute a pivot connecting portion 48.

  A hydraulic circuit diagram of the hydraulic drive system lifting mechanism 40 is shown in FIG. The left and right hydraulic drive system elevating mechanism 40 includes a main oil pump 50 connected to a first cylinder chamber 44 of a hydraulic cylinder 41 via a pipe. The main oil pump 50 is of a type that controls the discharge amount and discharge direction of oil by changing the rotation speed and rotation direction of the pump drive motor 51. In the pipe connecting the first cylinder chamber 44 and the oil tank 52, a prefill valve 53 is provided that controls the pressure and allows the oil in the oil tank 52 to flow to the first cylinder chamber 44 when necessary. The second cylinder chamber 45 of the left and right hydraulic cylinders 41 is connected to an accumulator 54 that is shared by the left and right hydraulic drive system lifting mechanisms 40. The accumulator 54 functions as a counter balance that supports a part of the weight of the ram 5 by constantly applying pressure to the second cylinder chamber 45 of the hydraulic cylinder 41. The pressure control of the prefill valve 53 is performed by a pilot pressure using the pressure of the accumulator 54 by electromagnetically controlling the on-off valve 55 and the direction control valve 56. In addition, an auxiliary pump 57 for supplying oil to the accumulator 54 is provided. The main body 40 a (FIG. 2) of the hydraulic drive system lifting mechanism 40 excluding the hydraulic cylinder 41 and the accumulator 54 is installed on the connecting frame 1 b of the main body frame 1, and the accumulator 54 is installed on the left side of the main body frame 1. Has been.

  This press machine includes a pedal-type press switch SW (FIG. 1) that outputs a command signal for executing press working, and a linear scale 72 (FIGS. 1 and 2) for detecting the height of the upper die 4. And are provided. The linear scale 72 includes a vertically long scale portion 72a attached to the side frame 1a and a reading head 72b attached to the ram 5 and reading the scale of the scale portion 72a.

  FIG. 8 is a block diagram of a control device that controls the elevating mechanism 27. The control device 70 may be provided inside the control panel 71 (FIG. 1) or outside the control panel 71. The control device 70 is a computer-type numerical control device, and sends command signals to the servo motor 31, the pump drive motor 51, the on-off valve 55, and the direction control valve 56 based on inputs from the press switch SW and the linear scale 72. Output. The control device 70 performs the following series of controls.

  Normally, the upper mold 4 is in a state of waiting at the standby position H1 (FIG. 1). When a command signal from the press switch SW is input from this state, the servo motor 31 is rotated downward, and the ram 5 is lowered by the motor drive system lifting mechanism 30 with a driving force of high speed and low load. At this time, by opening the on-off valve 55, the pressure of the accumulator 54 is applied to the prefill valve 53, and the prefill valve 53 is opened. As a result, the oil in the oil tank 52 is supplied to the first cylinder chamber 44 of the hydraulic cylinder 41, and the piston 43 of the hydraulic cylinder 41 moves downward following the operation of the ball screw mechanism 32 of the motor drive system elevating mechanism 30. Protruding.

  When the ram 5 is lowered to a height at which the upper mold 4 becomes the drive system switching position H2 (FIG. 1), the servo motor 31 is stopped, the pump drive motor 51 is rotated, and the main oil pump 50 rotates the hydraulic cylinder 41. Oil is fed into the first cylinder chamber 44. As a result, switching to driving of the hydraulic drive system lifting mechanism 40 is performed, and the ram 5 is lowered with a driving force of low speed and high load. At this time, the on-off valve 55 is closed, and the direction control valve 36 is switched from the prefill valve 53 to the oil return side to close the prefill valve 53.

  When the ram 5 is lowered to a height at which the upper mold 4 becomes the bottom dead center position H3 (FIG. 1), the pump drive motor 51 is reversed. Then, the oil is discharged from the first cylinder chamber 44 of the hydraulic cylinder 41, and the pressure oil stored in the accumulator 54 is supplied to the second cylinder chamber 45 accordingly. Thereby, the ram 5 rises. Since the driving force at this time uses the pressure of the accumulator 54, the driving force is lower than that when the main oil pump 50 generates the driving force.

  When the ram 5 rises to a height at which the upper mold 4 becomes the drive system switching position H2, the pump drive motor 51 is stopped and the servo motor 31 is rotated upward. Thereby, the driving of the motor drive system lifting mechanism 30 is switched to raise the ram 5 with the driving force of high speed and low load.

  By controlling the elevating mechanism 27 in this manner, the upper mold 4 is moved up and down from the standby position H1 to the drive system switching position H2 by the motor drive system elevating mechanism 30 that outputs a driving force with a high speed and a low load. The upper mold 4 is moved up and down from the drive system switching position P2 to the bottom dead center position H3 by the hydraulic drive system lifting mechanism 40 that outputs the driving force. The ball screw mechanism 32 employed in the motor drive system lifting / lowering mechanism 30 has a simple structure, but can accurately drive the upper die 4 at high speed. The hydraulic drive system lifting mechanism 40 can accurately determine the operating position of the upper mold 4 by controlling the pump drive motor 51 and adjusting the rotation speed of the oil pump 50. As a result, it is possible to realize stable movement of the upper mold 4 at a high speed and reliable pressing.

  Since the motor drive system elevating mechanism 30 is not involved in the pressure drive for press working, a small capacity one can be selected. Therefore, the inertia is small and the quick stop is good. Further, when the upper mold 5 is on standby at the standby position H1, it is supported by the motor drive system elevating mechanism 30, so that it is not affected by oil leakage from the hydraulic drive system elevating mechanism 40.

  Since the accumulator 54 is provided as a counter balance in the hydraulic drive system lifting mechanism 40, the upper mold 4 can be lifted and lowered with a small driving force. Therefore, the motor drive system elevating mechanism 30 can be miniaturized and energy efficiency is good. Further, by providing the accumulator 54, the number of control valves can be reduced, and the hydraulic circuit of the hydraulic drive system lifting mechanism 40 can be simplified.

  The ram 5 is provided so as to be tiltable with respect to the main body frame 1, and the combination of the motor drive system elevating mechanism 30 and the hydraulic drive system elevating mechanism 40 of the elevating mechanism 27 is provided in a pair of left and right. Can be tilted. Since the bulky hydraulic drive system elevating mechanism 40 is arranged inside the motor drive system elevating mechanism 30, maintenance of the elevating mechanism 27 can be easily performed from the left and right outer sides of the machine.

  A connecting plate 5a of the ram 5 and a nut 32b which is a movable part of the motor drive system lifting mechanism 30 are connected via a link 36, and the connecting plate 5a and a piston rod 43a which is a movable part of the hydraulic drive system lifting mechanism 40 Are connected to each other by a pivot connecting portion 48 having a spherical contact surface, and therefore can cope with the right and left inclination of the ram 5. The connecting plate 5a and the piston rod 43a may be in contact with each other through a cylindrical contact surface.

  The height of each mold division 4A of the upper mold 4 is individually adjusted by the sagging adjustment device 6 according to the thickness, material, bending shape and the like of the workpiece W. This is to prevent the right and left center portion of the ram 5 from being bent in the direction opposite to the pressurizing direction during pressurization, resulting in an inappropriate height relationship between the upper mold 4 and the lower mold 2.

  The height adjustment of the mold divided body 4A is performed by changing the front / rear position of the intermediate wedge member 8 by the front / rear position changing means 21. Specifically, with the bolt 14 loosened, the screw member 23 of the front / rear position changing means 21 is turned to change the screwing amount into the screw hole 22. Thereby, the front-rear position of the intermediate wedge member 8 is changed. When the position of the intermediate wedge member 8 is changed forward, the upper holder 10 is pushed down by the cylindrical surface 8b of the intermediate wedge member 8. When the position of the intermediate wedge member 8 is changed to the rear, a gap is generated between the cylindrical surface 8b of the intermediate wedge member 8 and the recess 10b of the upper mold holder 10, and therefore the upper mold holder 10 is lifted by the gap. Accordingly, the relative positional relationship between the fixing member 13 and the upper mold holder 10 in the vertical direction changes. Since the bolt hole 14a of the fixing member 13 is a long hole that is long in the vertical direction, it can cope with the change in the relative positional relationship. By reading the scale 25 that coincides with the mark 24 of the screw member 23, the height position of the mold divided body 4A can be known. After the adjustment, the bolt 14 is tightened to fix the fixing member 13 and the upper mold holder 10.

  Moreover, the mold division body 4A can be inclined to the left and right by making the front and rear positions of two intermediate wedge members 8 provided for one upper mold holder 10 different from each other. As a result, for example, as shown in FIG. 9, the line connecting the lower ends of the respective mold divided bodies 4 </ b> A can have a shape close to a single connected curve, that is, a crowning shape. If it is this shape, each part of each metal mold | die division body 4A will be strongly applied with the substantially same force with respect to the workpiece | work W, and a favorable bending process can be performed.

  Since the surface in contact with the upper mold holder 10 of the intermediate wedge member 8 is a cylindrical surface 8 b that is convex toward the upper mold holder 10, the upper mold holder 10 can be inclined to any inclination posture with respect to the intermediate wedge member 8. . Moreover, since the intermediate wedge member 8 and the upper mold holder 10 are kept in contact with each other regardless of the tilting posture of the upper mold holder 10, it is possible to always ensure a sufficient proof strength against pressure.

  Since the upper surface of the intermediate wedge member 8 is the horizontal surface 8a, the height of the intermediate wedge member 8 can be reduced. Further, if the upper surface is the horizontal surface 8a, the intermediate wedge member 8 can be easily slid to the left and right with respect to the ram 5, and the adjustment of the left and right positions of the mold divided body 4A is easy. The left and right positions of the mold divided body 4A are adjusted in a state where the bolts 18 are loosened and the pressing member 17 is released from being pressed by the pressing members 17. At this time, the fixing member 13 is caught on the step surface 16a of the ram 5. Since the drop of the fixing member 13 is restricted by the hooking of the portion 13a, the adjustment work is easy to perform.

  In the sag adjustment device 6 of this embodiment, the lower surface of the intermediate wedge member 8 is a cylindrical surface 8b convex downward, but the lower surface of the intermediate wedge member 8 is a concave cylindrical surface (not shown). ). In that case, a cylindrical surface-shaped convex part (not shown) is provided on the upper surface of the upper mold holder 10, and the convex part of the upper mold holder 10 is in contact with the cylindrical surface of the intermediate wedge member 8. Also in this configuration, the mold divided body 4A can be inclined to the left and right by making the front and rear positions of the intermediate wedge members 8 provided two per one upper mold holder 10 different from each other.

  FIG. 10 shows a configuration in which the lower mold 2 is divided into a plurality of mold divided bodies 2A, and the height of each mold divided body 2A is individually adjusted by the sag adjustment device 6. In this case, the mold fixing means 7 fixes each mold divided body 2A to the table 3 so that the height can be adjusted, and the intermediate wedge member 8 is interposed between the table 3 and the mold divided body 2A. Adjust the distance between them.

  The mold fixing means 7 has a fixing member 13 that is substantially the same width as the mold divided body 2 </ b> A and whose lower end is fixed to the upper end of the table 3 with a bolt, and the mold is divided at the upper end of the fixing member 13. The body 2A is fastened with a bolt 14. The bolt hole 14a of the fixing member 13 through which the bolt 14 is inserted is a loose hole having an adjustment gap in the vertical direction with respect to the bolt diameter, for example, a long hole that is long in the vertical direction.

  The intermediate wedge member 8 is provided by being fitted into the recesses 2b provided at two locations on the lower surface of the mold divided body 2A arranged in the left-right direction. The concave portion 2b has a cylindrical surface shape whose central axis is inclined forward and downward. The intermediate wedge member 8 is a cylindrical surface 8b whose lower surface is a horizontal surface 8a and whose upper surface is inclined in the front-rear direction corresponding to the concave portion 2b and is convex upward. The lower surface made of the horizontal surface 8a is slidably in contact with the upper end surface of the table 3, and the upper surface made of the cylindrical surface 8b is slidably in contact with the inner peripheral surface of the recess 2b in the front-rear direction and the circumferential direction.

  The height of the mold divided body 2A is adjusted by changing the front / rear position of the intermediate wedge member 8 by the front / rear position changing means 21 including the screw hole 22 and the screw member 23, as described above. That is, with the bolt 14 loosened, the screw member 23 of the front / rear position changing means 21 is turned to change the screwing amount into the screw hole 22. Thereby, the front-rear position of the intermediate wedge member 8 is changed. When the position of the intermediate wedge member 8 is changed to the front, the mold divided body 2A is lifted by the cylindrical surface 8b of the intermediate wedge member 8. When the position of the intermediate wedge member 8 is changed rearward, a gap is generated between the cylindrical surface 8b of the intermediate wedge member 8 and the recess 2b of the mold divided body 2A. Therefore, the mold divided body 2A is pushed by the gap. Lower. Along with this, the relative positional relationship in the vertical direction of the fixing member 13 and the mold divided body 2A changes. Since the bolt hole 14a of the fixing member 13 is a long hole that is long in the vertical direction, it can cope with the change in the relative positional relationship. After completion of the adjustment, the bolt 14 is tightened to fix the fixing member 13 and the mold divided body 2A.

1 ... Body frame 2 ... Lower mold (mold)
2A ... Mold division 3 ... Table (supporting member)
4 ... Upper mold (mold)
4A ... Mold body 5 ... Ram (support member)
6 ... Sag adjustment device 7 ... Mold fixing means 8 ... Intermediate wedge member 8a ... Horizontal surface 8b ... Cylindrical surface 13 ... Fixing member 13a ... Hook 16 ... Vertical surface 16a ... Step surface 17 ... Pushing member 21 ... Change of front and rear position means

Claims (4)

In a press machine that includes an upper mold and a lower mold that are long on the left and right sides, and presses the plate material positioned between the upper and lower molds by the relative vertical movement of these upper and lower molds.
The upper mold or the lower mold is fixed to a support member that supports the mold by a mold fixing means so that the height can be adjusted,
At a plurality of positions in the left-right direction between the height-adjustable mold and its support member, the surfaces in contact with the mold are inclined in the front-rear direction and are convex or concave cylindrical surfaces on the mold side. An intermediate wedge member that is slidable in the front-rear direction and the circumferential direction along the cylindrical surface,
A front / rear position changing means for changing the front / rear position of the intermediate wedge member is provided,
Sag adjustment device for press machines.   The intermediate wedge member is interposed between the upper mold and the support member, and the upper mold is composed of a plurality of mold divisions divided in the left-right direction, and an upper surface of each mold division 2. The cylindrical surfaces of the two intermediate wedge members are slidably contacted in the front-rear direction and the circumferential direction along the cylindrical surface, respectively, on the cylindrical surface-shaped concave portions or convex portions provided at two left and right positions of the cylindrical surface. The sag adjustment device of the described press machine.   3. The press machine sag adjustment device according to claim 2, wherein an upper surface of the intermediate wedge member that is a surface opposite to the cylindrical surface is a horizontal surface. 4.   The mold fixing means includes a fixing member that is fixed so that the position in the left-right direction can be changed in a state in which the upper end is in contact with the vertical surface of the support member, and the mold divided body is fixed to the lower end. The member is fixed to the support member by being pressed against the vertical surface by a pressing member from the opposite side of the vertical surface, and an upward step surface along the left-right direction is provided on the vertical surface of the support member. 4. The press machine sag adjustment device according to claim 2 or 3, wherein a hook portion is provided on the fixing member to restrict the fixing member from falling by being hooked on the stepped surface.

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