JP2017225976A - Die height measuring device of forging press and transfer beam position measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die height measuring device which can perform accurate measurement of a die height of a forging press even in an adverse environment and is hardly restricted by a fitting position.SOLUTION: A die height measuring device includes a hydraulic servo cylinder 21 which fixes a cylinder tube 21a elongated in a vertical direction to a slide 12 and vertically moves a piston rod 21b on a position opposite to an upper surface of a bolster 13, and measures a position in the advancing/retreating direction of the piston rod 21b when the slide 12 arrives at a lower limit position of a vertically moving stroke thereof in such a state that the piston rod 21b is lowered and is brought into contact with the upper surface of the bolster 13 with a sensor incorporated in the hydraulic servo cylinder 21. Therein, only when performing such a measurement, the piston rod 21b is projected from the cylinder tube 21a and, thereby, restriction of fitting position can be minimized and the measurement can be accurately performed even in an adverse environment.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a measuring instrument for measuring the die height of a forging press and a measuring instrument for measuring the position of a transfer beam in a transfer device.

  A forging press reciprocates a slide with a predetermined lifting stroke, and works with an upper die attached to the lower surface side of the slide and a lower die attached to the upper surface side of a bolster installed below the slide. Material) is forged. In this forging press, in order to ensure the stability of the quality of the product (molded product) thickness (dimension in the press height direction), it is possible to appropriately respond to changes in the behavior of the upper and lower molds during processing. is important.

  For example, in a forging press that performs hot forging, the upper and lower molds, slides, and bolsters expand due to heat transmitted from the workpiece, heat generated during processing, or elastic deformation due to reaction force during processing, resulting in product thickness. Fluctuates. Therefore, when the deviation of the product thickness from the target value becomes large, the dimension between the lower surface of the slide and the upper surface of the bolster when the slide is at the lower limit position (bottom dead center) of the lift stroke, that is, the die height is adjusted. It will be. In order to perform the adjustment with high accuracy, it is necessary to measure the actual die height and determine the adjustment amount in consideration of processing conditions and the like.

  To measure the actual die height, attach the detection needle to the detection member fixed to the lower surface of the slide, and use a linear scale with a linear gauge fixedly placed at a position facing the detection needle, when the slide is at the bottom dead center. There is a method of detecting the position of the detection member with a linear gauge (for example, see Patent Document 1). There is also a method using an optical non-contact type sensor instead of such a linear scale.

  By the way, in a forging press, a plurality of sets of upper and lower dies are arranged in one direction in the horizontal direction, and workpiece transfer and workpiece processing are repeated in the direction in which the dies are arranged, so that a single machine performs a plurality of processes. There is a transfer press that can do it. The transfer press includes a transfer device that transfers a workpiece by moving a transfer beam extending in a pair of left and right along the workpiece conveyance direction and sandwiching the workpiece from the left and right directions in the workpiece conveyance direction, the left and right directions, and the vertical direction. ing.

  In the above transfer device, the transfer beam is tilted in the horizontal plane with respect to the workpiece transfer direction during use due to backlash of each part, and the workpiece cannot be clamped on the side where the distance between the transfer beams is widened. May not be able to be performed. For this reason, it is desirable to measure the position of the transfer beam in the left-right direction at an appropriate frequency and manage it so that the inclination does not increase.

Japanese Utility Model Publication No. 62-4355

  However, even if the measurement of the position in the left-right direction of the die height or transfer beam is performed using a measuring instrument such as a linear scale or an optical non-contact sensor as described in Patent Document 1, the surrounding area is heated. The position of the die height or transfer beam is not good because the oxide film (scale) peeled off from the surface of the metal workpiece to be forged or the lubricant sprayed on the work surface of the mold is scattered and the measurement environment is bad. It is difficult to obtain the measurement accuracy required to precisely adjust the measurement, and there is a risk that the measuring device will fail early.

  In addition, the measuring instrument as described above needs to be mounted at a position that does not interfere with a mold or the like and does not interfere with other processes when measurement is not performed, and there is a problem that there are many restrictions on the mounting position.

  Therefore, an object of the present invention is to provide a measuring instrument that can accurately measure the die height of a forging press and the position in the left-right direction of a transfer beam even in a bad environment and has few restrictions on the mounting position.

  In order to solve the above-mentioned problem, the first invention of the present application is that between the lower surface of the slide and the upper surface of the bolster installed below the slide when the slide of the forging press is at the lower limit position of the lifting stroke. In a die height measuring instrument of a forging press that measures a die height that is a size of the power cylinder, a power cylinder that is fixed to the slide and moves the piston rod up and down at a position facing the upper surface of the bolster, and a position of the piston rod in the forward and backward direction of the power cylinder The position of the piston rod in the advancing / retreating direction when the slide reaches the lower limit position of the lifting stroke with the piston rod of the power cylinder lowered and in contact with the upper surface of the bolster. The die height is obtained from the measurement result of the position of the piston rod in the forward and backward direction. It adopted the configuration that.

  In the die height measuring device having the above-described configuration, the piston rod of the power cylinder is usually housed in the cylinder tube, and the piston rod is lowered only when the die height is measured, thereby reducing the restriction on the mounting position. In addition, a decrease in measurement accuracy and a decrease in durability due to environmental influences can be suppressed.

  Here, the power cylinder is provided at the position of each vertex of the quadrangle in plan view, and the die height is obtained by using the average value of the measurement results of the piston rod advance and retreat direction positions of the power cylinders. Thus, even when the slide is slightly inclined, the die height can be accurately measured.

  Moreover, 2nd invention of this application is extended in the left-right pair along the conveyance direction of the said workpiece | work among the transfer apparatuses which convey the workpiece | work processed with a forge press, and it is the conveyance direction of the said workpiece | work, the left-right direction, and an up-down direction. In the transfer beam position measuring device of the forging press that measures the lateral direction position of the moving transfer beam, the piston rod is horizontally disposed at a position facing the outer surface of the transfer beam, which is fixedly disposed outside the lateral direction of the transfer beam. A power cylinder that moves forward and backward, and a sensor that measures the position of the piston rod of the power cylinder in the advancing and retracting direction, the piston rod of the power cylinder being advanced and in contact with the outer surface of the transfer beam. How to move the piston rod back and forth when the beam reaches the specified position Measured position by the sensor, and employs a configuration to determine the position in the lateral direction of the transfer beam from the measurement results of the forward and backward direction position of the piston rod.

  Similarly to the die height measuring instrument of the first invention, the transfer beam position measuring instrument having the above configuration is usually only when the piston rod of the power cylinder is housed in the cylinder tube and the horizontal position of the transfer beam is measured. By making the piston rod move forward, there are less restrictions on the mounting position, and it is possible to suppress a decrease in measurement accuracy and a decrease in durability due to the influence of the environment.

  As described above, the die height measuring device and transfer beam position measuring device of the forging press according to the present invention comprise a power cylinder and a sensor for measuring the position of the piston rod in the advancing and retracting direction. By storing in the tube and projecting the piston rod only when measurement is performed, restrictions on the mounting position can be reduced, and measurement can be performed accurately even in adverse environments.

  And a product with stable quality can be manufactured by adjusting the die height based on the measurement result of the die height measuring instrument of the present invention. Further, by reducing the inclination of the transfer beam with respect to the workpiece conveyance direction based on the measurement result of the transfer beam position measuring device of the present invention, troubles in workpiece conveyance can be prevented.

Longitudinal front view of a forging press incorporating the die height measuring instrument of the embodiment Sectional view along the line II-II in FIG. Sectional view along line III-III in FIG. Cross-sectional plan view of the main part of a forging press incorporating the transfer beam position measuring device of the embodiment

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a forging press incorporating the die height measuring device of the embodiment. This forging press includes a press main body 1 fixedly installed on a floor F, a crankshaft 3 rotatably supported at both ends by side frames 2 on both sides of the press main body 1, and a servo motor that rotationally drives the crankshaft 3. 4 is a crank press provided with a speed reduction mechanism 5 for reducing the rotation of the servo motor 4 and transmitting it to the crankshaft 3, and a brake 6 for holding the crankshaft 3 in a stopped state. The servo motor 4 and the speed reduction mechanism 5 are arranged outside the side frame 2 on one side of the press body 1, and the brake 6 is arranged outside the side frame 2 on the other side of the press body 1.

  In the press main body 1, an upper frame 7 and a lower frame 8 are connected by a tie rod 9 and a nut 10 with the side frames 2 on both sides being sandwiched. A substantially rectangular parallelepiped slide 12 is connected to the center of the crankshaft 3 in the axial direction via a connecting rod (connecting rod) 11, and a bolster 13 is fixed to the upper surface of the lower frame 8. As the crankshaft 3 rotates, the slide 12 reciprocates up and down with a certain stroke, and the workpiece is processed by the upper die 14 attached to the lower surface side of the slide 12 and the lower die 15 attached to the bolster 13. Is supposed to do. A hydraulic slide position adjusting device 16 for finely adjusting the vertical position of the slide 12 is provided near the center of the press body 1 in the height direction.

  Further, as shown in FIG. 3, a total of eight plate-shaped guide gibs 17 are attached to the side frames 2 on both sides of the press body 1 at positions facing the four corners of the slide 12 in a plan view in a state where the plate-like guide gibs 17 extend in the vertical direction. These guide gibbs 17 guide the vertical movement of the slide 12.

  Moreover, as shown in FIG. 2, the balancer 18 which hold | maintains the slide 12 in the state suspended is provided in the upper part of the forge press. The balancer 18 is composed of four hydraulic cylinders 19 arranged in a vertically extending state at the position of the quadrangular vertex in plan view. In each hydraulic cylinder 19, the cylinder tube 19 a is fixed to the press main body 1, and the piston rod 19 b is fixed to the slide 12 via the connecting member 20, so that a lifting force that balances the weight of the connecting rod 11 and the slide 12 is generated by four. It has become.

  Further, as shown in FIGS. 1 to 3, hydraulic servo cylinders 21 as power cylinders are attached to the four corners (positions of the respective vertices of the quadrangle in plan view) of the lower surface of the slide 12. Each hydraulic servo cylinder 21 has an upper end portion of a cylinder tube 21 a extending in the vertical direction fixed to the slide 12 and moves the piston rod 21 b up and down at a position facing the upper surface of the bolster 13.

  The above-described four hydraulic servo cylinders 21 and sensors (not shown) that are built in the respective hydraulic servo cylinders 21 and measure the forward / backward direction positions of the respective piston rods 21b constitute the die height measuring instrument of the embodiment. . In addition, you may employ | adopt the sensor attached to a cylinder tube with a magnet.

  In the die height measuring instrument of this embodiment, the slide 12 reaches the lower limit position (bottom dead center) of its lifting stroke with the piston rods 21b of the four hydraulic servo cylinders 21 lowered and brought into contact with the upper surface of the bolster 13. The position of each piston rod 21b in the forward / backward direction is measured by the sensor. Then, the difference between the average value of the measurement results of the forward / backward direction position of each piston rod 21b and the preset reference position of the piston rod (position corresponding to the reference value of the die height) is used as the amount of change from the reference value of the die height. Find the measured value of die height. Therefore, even if the slide or bolster is thermally expanded or worn during the operation of the forging press or is elastically deformed by the reaction force during processing, the actual die height can be accurately grasped at any time. Also, by measuring the die height during processing of one workpiece and before or after the processing, it is possible to know the extension of the slide and bolster due to the reaction force during processing.

  This die height measuring device is configured as described above. Normally, the piston rod 21b of each hydraulic servo cylinder 21 is housed in the cylinder tube 21a, and the piston rod 21b is lowered only when the die height is measured. Good. Therefore, there are few restrictions on the mounting position, and there is little decrease in measurement accuracy and durability due to the influence of the environment, and it is possible to accurately measure the die height over a long period even in a bad environment.

  In addition, since the die height measurement value is obtained by using the average value of the measurement results for the four hydraulic servo cylinders 21 provided at the positions of the respective vertices of the quadrangle in plan view, the slide 12 is slightly inclined. Even in this case, there is an advantage that measurement can be performed with high accuracy.

  In the forging press incorporating this die height measuring device, a product with stable quality can be manufactured by adjusting the die height with the hydraulic slide position adjusting device 16 or the like based on the measurement result of the die height measuring device. .

  FIG. 4 shows a forging press incorporating the transfer beam position measuring device of the embodiment. In this forging press, a plurality of sets of upper and lower molds (an upper mold and a lower mold 22 not shown) are arranged in one horizontal direction, and the workpiece is conveyed and processed in the direction in which the molds are arranged. The transfer press is configured so that a plurality of processes can be performed by one unit, and the transfer of the workpiece is performed by the transfer device 23. The transfer device 23 moves a pair of left and right transfer beams 24 along the workpiece conveyance direction (arrow direction in the drawing) in a workpiece conveyance direction, a horizontal direction, and a vertical direction by a beam driving device (not shown). Thus, the work is sandwiched and conveyed from the left-right direction.

  One hydraulic servo cylinder 21 is arranged on the upstream side and the downstream side in the workpiece transfer direction outside the transfer beam 24 of the transfer device 23 in the left-right direction. Each hydraulic servo cylinder 21 has one end portion of a cylinder tube 21a extending in the left-right direction fixed to the side frame 2 of the press body 1 so that the piston rod 21b is advanced and retracted in a horizontal direction at a position facing the outer surface of the transfer beam 24. It has become.

  Each of the hydraulic servo cylinders 21 is built in the hydraulic servo cylinder 21, and together with a sensor (not shown) for measuring the position of the piston rod 21b in the advancing / retreating direction constitutes the transfer beam position measuring device of the embodiment. .

  Each transfer beam position measuring device of this embodiment is a piston rod when the transfer beam 24 reaches a predetermined position in a state where the piston rod 21b of the hydraulic servo cylinder 21 is moved forward and brought into contact with the outer surface of the transfer beam 24. The forward / backward direction position of 21b is measured by the sensor. The difference between the measurement result of the position of the piston rod 21b in the forward / backward direction and the preset reference position of the piston rod (the position corresponding to the reference position of the transfer beam 24) is the amount of change from the reference position of the transfer beam 24. As a result, the measured value of the position in the left-right direction of the transfer beam 24 is obtained.

  Similarly to the above-described die height measuring device, this transfer beam position measuring device only needs to advance and retract the piston rod 21b only when performing measurement, so that there are few restrictions on the mounting position, and the transfer beam 24 can be accurately moved in the left-right direction over a long period of time. Position measurements can be made.

  In the forging press incorporating this transfer beam position measuring device, the position of the transfer beam 24 is adjusted so that the inclination with respect to the workpiece conveying direction becomes small based on the measurement result of each transfer beam position measuring device. Can prevent troubles.

  In the forging press shown in FIG. 4, the horizontal position of the transfer beam 24 is measured by a transfer beam position measuring device. The transfer beam position measuring device is arranged with the hydraulic servo cylinder extending in the vertical direction, The transfer beam can be modified to measure the vertical position of the transfer beam and used for adjusting the vertical position of the transfer beam.

  In the above-described embodiment, a hydraulic servo cylinder capable of high-precision control is used as the power cylinder constituting the die height measuring device or the transfer beam position measuring device. However, an electric cylinder, a pneumatic cylinder, or the like is also used. Can do.

1 Press body 2 Side frame 3 Crankshaft 4 Servo motor 12 Slide 13 Bolster 21 Hydraulic servo cylinder (power cylinder)
21a Cylinder tube 21b Piston rod 23 Transfer device 24 Transfer beam

Claims (3)

In the die height measuring device of the forging press that measures the die height that is a dimension between the lower surface of the slide and the upper surface of the bolster installed below the slide when the slide of the forging press is at the lower limit position of the lifting stroke,
A power cylinder fixed to the slide and moving the piston rod up and down at a position facing the upper surface of the bolster, and a sensor for measuring the position of the piston rod of the power cylinder in the advancing and retracting direction,
With the piston rod of the power cylinder lowered and in contact with the upper surface of the bolster, the position of the piston rod in the advancing / retreating direction when the slide reaches the lower limit position of the lift stroke is measured by the sensor. A die height measuring instrument for a forging press, characterized in that a die height is obtained from a measurement result of a position in a forward / backward direction of the rod.   The power cylinder is provided at a position of each vertex of a quadrangle in a plan view, and a die height is obtained using an average value of measurement results of piston rod advance and retreat direction positions of the power cylinders. The die height measuring instrument for a forging press according to 1. Among transfer devices that transport workpieces processed by a forging press, measure the left-right position of the transfer beam that extends in the left-right pair along the workpiece transport direction and moves in the workpiece transport direction, left-right direction, and up-down direction In the forging press transfer beam position measuring instrument
A power cylinder fixedly arranged on the outer side in the left-right direction of the transfer beam and moving the piston rod horizontally in a position facing the outer surface of the transfer beam, and a sensor for measuring the position of the piston rod in the power cylinder in the forward / backward direction And consist of
With the piston rod of the power cylinder moved forward and in contact with the outer surface of the transfer beam, the position of the piston rod in the advancing / retreating direction when the transfer beam reaches a predetermined position is measured by the sensor. A transfer beam position measuring device for a forging press, characterized in that the position of the transfer beam in the left-right direction is obtained from the measurement result of the position in the forward / backward direction.

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