JP2010099730A - Press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press having a wide slide lower face which can improve the working precision of a workpiece even if an eccentric load is applied. <P>SOLUTION: In the press, plungers 8 connected to a crankshaft and a slide 10 are connected at three point positions along a workpiece carrying-in direction. Slide inclination correction devices 20 are arranged in the vicinity of the connection part between each plunger 8 and the slide 10. Each slide inclination correction device 20 comprises: a worm wheel 22 screwed with each plunger 8; a worm 21 engaged with the worm wheel 22; and a motor rotatively driving the worm 21. Linear scales 30, 31 are set between the slide 10 and a bolster 7, and the inclination of the slide 10 can be detected. When the inclination of the slide 10 is detected by the liner scales 30, 31, either slide inclination correction device 20 is driven so as to correct its position. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a multi-point press having a slide connected to a crankshaft at a plurality of connection points, and more particularly to a press that improves the parallelism between a slide lower surface and a bed surface.

In a press machine having a wide slide lower surface, in order to improve the processing accuracy of a workpiece, a press machine having a plurality of connection points between a slide that reciprocates and a crankshaft that drives the slide reciprocation is configured. is there. For example, the press machine of Patent Document 1 includes a wide slide, and includes a drive crankshaft arranged in the front-rear direction and a driven crankshaft arranged in parallel with the drive crankshaft in between. Yes. The drive crankshaft and the driven crankshaft are connected by meshing between a drive gear attached to one end of the drive crankshaft and a driven gear attached to one end of the driven crankshaft, and are driven to rotate at the same timing. On the other hand, each crankshaft is provided with a connecting rod / plunger, and is connected to the slide at three positions along the conveying direction at the upper part of the slide. Thus, the slide is reciprocated by the rotation of the drive crankshaft.
JP 2003-205394 A

  The increase in the number of connecting points that connect the crankshaft or other drive mechanism and the slide increases the parallelism between the lower surface of the slide and the bed surface by configuring the plunger connected to the connecting part as a guide member for reciprocal movement. The processing accuracy of the press machine can be improved. However, increasing the number of connection points means that the lower surface of the slide is configured corresponding to a large area, and an eccentric load is likely to be applied to the slide depending on the processing content of the workpiece. When an eccentric load is applied to the slide, a portion that guides the slide is deformed and the slide is inclined, which causes a decrease in parallelism between the bolster mounted on the bed and the lower surface of the slide. In particular, in a press having three or more connection points in the workpiece conveyance direction, an eccentric load is likely to be applied to the slide workpiece conveyance direction, and the slide tends to tilt in the workpiece conveyance direction. Further, in the case of a press machine having two or more connecting points in a direction (front-rear direction) perpendicular to the workpiece conveyance direction, an eccentric load is easily applied to the slide front-rear direction, and the slide is in the front-rear direction of the workpiece. Easy to tilt.

  In addition, when there are three or more connection points in the workpiece conveyance direction and the two connection lines are arranged in two lines in the front-rear direction, machining is performed unlike the case where the connection points are two points in the workpiece conveyance direction. The inclination of the slide changes in a complex manner depending on the shape of the workpiece and the state of the eccentric load. In this case, it has been necessary to accurately measure the height position of the bed at each position. In this case, for example, it is necessary to set one position at the slide bottom dead center position as a reference position and correct an error from the reference position at another position on the lower surface of the slide.

  In the above-mentioned patent document 1, although the drive mechanism of the press machine which comprises three connection points is disclosed, there is no mention about correcting the inclination of the slide.

The present invention solves the above-mentioned problems, and in a press machine having a multi-point connecting portion having a wide slide lower surface, the parallelism between the slide lower surface and the bed surface is corrected by correcting the inclination of the slide due to the eccentric load. An object of the present invention is to provide a press machine capable of improving the above. Therefore, the press machine according to the present invention is configured as follows. That is,
According to the first aspect of the present invention, a reciprocable slide for processing a workpiece, a driving means for reciprocating the slide, a guide for moving the slide in a vertical direction, and connecting the slide and the driving means. And a plunger that is disposed so as to connect the driving means and the slide at at least three positions along a work conveying direction of the slide. In the lower surface position of the slide along the axial direction, a slide inclination correction means for making the bed surface and the slide lower surface parallel to each other is provided in the vicinity of the connection portion between the plunger and the slide,
After detecting the inclination of the lower surface of the slide by the detecting means, the slide inclination correcting means disposed in the vicinity of the portion of the slide lower face having a large inclination among the slide inclination correcting means, the lower surface of the slide being It is characterized by being controlled and corrected so as to be parallel to the bed surface.

  The invention according to claim 2 relates to the invention according to claim 1, wherein the connection portion is arranged in two rows in a direction perpendicular to the workpiece transfer direction at any or all of the at least three point positions. It is characterized by being arranged.

  The invention according to claim 3 relates to the invention according to claim 1 or 2, wherein the slide inclination correcting means includes a driven gear formed on the plunger, a drive gear engaged with the driven gear, And a drive source for rotating the drive gear.

  The invention according to claim 4 relates to the invention according to claims 1 to 3, wherein the detecting means detects the height position of the slide from the bed surface by linear scales mounted at a plurality of positions. It is characterized by that.

  The invention according to claim 5 relates to the invention according to claims 1 to 3, wherein the detecting means detects the inclination of the slide by measuring the thickness of the processed product. It is a feature.

  The invention according to claim 6 relates to the invention according to any one of claims 1 to 5, wherein one of the slide inclination correcting means disposed in the connecting portion is centered on one of the other points. It is characterized in that the correction means are simultaneously moved in the height direction.

  The press machine according to the first aspect of the present invention is a press machine having at least three or more connecting portions for connecting the driving means and the slide with respect to the workpiece conveyance direction. This corresponds to the case where the part guiding the slide is deformed and the slide is inclined with respect to the bed surface. In other words, the inclination of the slide is detected as data by the detection means, and based on the detection data, the slide inclination correction means disposed near the portion of the slide lower surface with a large inclination is controlled, so that the slide lower surface becomes the bed surface. The correction is made so as to be parallel to the other.

  Therefore, according to the present invention, even if a slide tilt occurs due to an eccentric load at the time of press working, it can be corrected by detecting a portion having a large tilt by the detecting means and operating the slide tilt correcting means. Parallelism with the bed surface can be ensured. As a result, the machining accuracy of the workpiece can be improved.

  According to the configuration of claim 2 of the present invention, in this press machine, the wide slide has at least three connection points connected to the driving means in the transport direction, and additionally transports. Even in the case of being arranged in at least two rows in a direction orthogonal to the direction, the machining accuracy of the workpiece can be improved as in the first aspect of the invention.

  According to the third aspect of the present invention, when the drive source in the selected slide inclination correcting means rotates the drive gear, the driven gear engaged with the drive gear is rotated. The driven gear moves with respect to the plunger, and can move the slide itself. Therefore, the parallelism between the slide lower surface and the bed surface is ensured by moving the slide position corrected by the selected slide inclination correcting means by a necessary amount. Accordingly, since the slide tilt correcting means can be configured by the configuration of the drive command and the drive gear and the driven gear to be commanded, even if a plurality of slide tilt correcting means are provided, the processing accuracy of the product can be improved with a simple configuration. Can do.

  According to the fourth aspect of the present invention, a linear scale is attached as the detecting means for detecting the tilt of the slide. In this case, by mounting a plurality of slides in the left-right direction or the front-rear direction, the tilt state can be accurately detected at various positions on the slide. In the case of this linear scale, the height (die height) between the bolster and the bottom surface of the slide can be detected, so the die height can be measured over almost the entire bottom surface of the slide by providing multiple linear scales. Any one of the slide inclination correcting means to be corrected can be selected and driven.

  According to the configuration of the fifth aspect of the present invention, the product defect due to the tilt of the slide can be corrected based on the measurement result of the processed product. In this case, it is determined from the measurement result data whether any eccentric load is applied to any part of the lower surface of the slide, and the slide inclination is corrected by operating one of the slide inclination correction means corresponding to that part. Control as you can. In this case, since it is based on the measurement data of the processed product, accurate correction according to the product can be performed.

  Furthermore, according to the configuration of claim 6 of the present invention, when correcting the slide inclination, if any one point on the lower surface of the slide is set as the reference position, the other position is arranged near the portion where the slide inclination is large. In addition to the slide inclination correction means, the other slide inclination correction means are driven simultaneously. In this case, the adjustment movement amount is adjusted in proportion to the length in the height direction with respect to the inclination. For example, if there are three connection points in the workpiece conveyance direction, when the reference position is set to one point position of one end, the one point position of the other end is set. The amount of movement at one point position in the center is set to about half of the amount of movement. Further, when the correction is made based on the position of one point in the center, the movement amount corresponding to the same length is set in the opposite direction at the two point positions at both ends. Accordingly, the tilt of the slide can be corrected without applying an excessive force to the guide unit that guides the vertical movement of the slide.

  Next, an embodiment of a press machine of the present invention will be described based on the drawings.

  1 and 2 show a pressing machine having a structure in which a slide is provided with three connection points and connected to a driving means (crankshaft) with respect to a workpiece conveyance direction.

  The press machine M is formed in a gate shape and has a machine frame 1 including a crown 2, a column 3, and a bed 4 from the top, and three cranks supported by the crown 2 so as to be pivotable in the front-rear direction (see FIG. 2). A shaft 5, a connecting rod 6 pivotally attached to an eccentric portion (hereinafter referred to as a crankpin portion) 51 of the crankshaft 5, a plunger 8 having one end pivotally supported by a pin 81 on the connecting rod 6, And a slide 10 that is connected to the end and reciprocates in a direction approaching and separating from the bolster 7 mounted on the bed 4. Further, the slide drive means is configured to include the crankshaft 5, the connecting rod 6, and the main motor 13 that rotationally drives the crankshaft 5.

  Of the three crankshafts 5, one end of the crankshaft 5 disposed in the center is connected to the main motor 13 via the pulley 11, the belt 12 or a clutch portion (not shown) and is driven to rotate by the main motor 13. The other two are configured as driven crankshafts 5B and 5B arranged along the longitudinal direction of the slide 10 with the drive crankshaft 5A in between. A drive gear 15 is mounted on one end of the drive crankshaft 5A, and driven gears 16 and 16 are mounted on one end of the driven crankshafts 5B and 5B, respectively. The drive gear 15 and the driven gear 16 are meshed to transmit the rotation of the drive crankshaft 5A to the driven crankshafts 5B and 5B.

  For example, spur gears are used as gears (drive gear 15 and driven gear 16) mounted on one end of the drive crankshaft 5A and driven crankshaft 5B with a key (not shown), and the drive crankshaft 5A and driven crankshaft are driven. When the crank pin portions 51 of 5B are installed at the same angular position, they are engaged with each other, and the respective crankshafts 5 (the drive crankshaft 5A and the driven crankshaft 5B) are rotationally driven at the same timing. .

  The position of the drive crankshaft 5A connected to the main motor 13 may be changed from that of one of the driven crankshafts 5B in FIG. 1, for example. However, as shown in the drawing, it is desirable that the left and right driven crankshafts 5B and 5B are rotationally driven in the same direction with a good balance in the center.

  Further, the slide drive means is not limited to the above-described configuration. For example, a single crankshaft is configured in the workpiece conveyance direction (left and right direction in FIG. 1), and the plunger 8 is provided at a plurality of positions. You may connect.

  Each connecting rod 6 having one end connected to each crankpin portion 51 of the drive crankshaft 5A or the driven crankshaft 5B or 5B and the other end connected to the plunger 8 is connected to the drive crankshaft 5A or the driven crankshaft 5B. 5B is configured to convert the rotational motion of 5B into a linear motion. As shown in FIG. 3, the plunger 8 is reciprocated and guided by three plunger guide portions 2 a formed at the lower part of the crown 2, one end is connected to the slide 10, and the other end is connected to the connecting rod 6. It is connected to one end.

  In the embodiment, the slide 10 is formed to be wide along the material conveyance direction in order to connect the three plungers 8 at the upper portion, and is formed so that the upper die can be attached to the slide lower surface 10a. On the other hand, a lower mold is mounted on the bolster 7, and a workpiece is inserted between the upper mold and the lower mold. The slide 10 has sufficient strength to receive a load when processing the workpiece.

  In addition, insertion holes 10b for inserting the three plungers 8 are formed on the upper surface of the slide 10, and guide posts 17 are slidably guided by post receivers 18 at both ends of the slide 10. . One guide post 17 is arranged at a position diagonally opposed to both ends of the slide 10, or two guide posts 17 are disposed at positions opposed to both ends of the slide 10.

  On the other hand, as shown in FIGS. 3 to 6, a slide inclination correction device 20 as a slide inclination correction unit is arranged at a connection portion between the slide 10 and each plunger 8. The plunger 8 is supported by the crown 2 by a plunger guide portion 2 a and enters the slide 10, and is connected to the slide 10. The plunger 8 is connected to the slide tilt correction device 20 at the lower end. The connecting structure between the plunger 8 and the slide inclination correcting device 20 in the embodiment is configured by connecting a worm 21 and a worm wheel 22. That is, the slide inclination correction device 20 is connected to the rotary shaft 23 arranged in a direction orthogonal to the workpiece conveyance direction and the drive shaft connected to one end side of the rotary shaft 23 to rotate the rotary shaft 23. Motor 24, a worm 21 that is attached to the rotating shaft 23 and rotates together with the rotating shaft 23, and a worm wheel 22 that is attached to the distal end portion of the plunger 8 and meshes with the worm 21.

  A known slide lock mechanism and slide adjust mechanism (not shown) are formed at the lower end of the plunger 8. That is, the lower end portion of the plunger 8 is screwed to the worm wheel 22, and the worm wheel 22 moves up and down together with the slide 10 by rotating with respect to the plunger 8. A male screw 82 is formed at the lower end portion of the plunger 8, and a female screw portion 22 a that meshes with the male screw 82 is attached to the worm wheel 22. As a result, the worm wheel 22 moves up and down with respect to the plunger 8. That is, movement adjustment of the slide 10 in the vertical direction is performed.

  The slide lock mechanism is also called a hydraulic lock device and fixes the slide 10 and the plunger 8 with hydraulic pressure. Therefore, the load applied to the press is received by hydraulic pressure.

  As shown in FIG. 3, a pair of linear scales 30 and 31 are disposed between the slide 10 and the bolster 7 at both ends of the slide 10 with respect to the work conveyance direction of the slide 10. Each of the linear scales 30 and 31 is composed of stators 30 a and 31 a that are fixedly arranged on the upper surface of the bolster 7 and movers 30 b and 31 b that are fixedly arranged on the slide lower surface 10 a. The distance between 10a and the bolster 7, that is, the slide bottom dead center position is output as an absolute value. An arithmetic processing circuit is electrically connected between the linear scales 30 and 31 and the control device. In addition, you may provide a linear scale in the approximate center position of the front-back direction of the slide 10 (or bolster 7), respectively.

  Next, the operation of the press machine M configured as described above will be described.

  An upper mold is mounted on the slide lower surface 10 a, and a lower mold is mounted on the upper surface of the bolster 7. The workpiece is conveyed from the workpiece carry-in side (left side in FIG. 1) toward the workpiece carry-out side (right side in FIG. 1) along the material line height between the upper die and the lower die.

  Since the workpiece is formed in a wide variety, depending on the workpiece, the center position of the combined load for punching the workpiece may not coincide with the center of the slide.

  When an eccentric load is applied to the slide 10 during operation of the press machine M, a moment is applied to the center position of the slide 10, and any one or a plurality of connecting parts connected to the slide 10 from the drive unit of the press machine M And the slide 10 is tilted with respect to the horizontal direction. If the parallelism with the bolster 7 (or the surface of the bed 4) exceeds the allowable range and the machining is continued, the machining becomes defective. Therefore, the linear scales 30 and 31 detect the inclination of the slide 10 and are arranged at predetermined positions. The slide inclination correcting device 20 is driven.

  The linear scale 30 has a portion where the stator 30a and the mover 30b overlap each other, and the amount of movement is electrically detected when the mover 30b moves relative to the stator 30a. For example, as in the embodiment, if two sets of linear scales 30 and 31 are arranged at both ends of the work conveyance direction of the slide 10, changes in the amount of movement of the slide lower surface 10a are detected at two positions. be able to. In this case, since the linear scale 30 can be detected by an absolute value, the height position with respect to the initially set die height is changed by the change in the height position of the slide due to the eccentric load on the basis of the position set before the workpiece machining. The change and the inclination angle α between the two positions (see FIG. 7) are detected. The detected numerical value is input to the control device as an electric signal. Then, the control device issues a drive command to the motor 24 of any one of the slide tilt correction devices 20 selected to be corrected based on the input electrical signal.

  In the case of the embodiment, as shown in FIG. 7, for example, the slide lower surface 10a has a die height height H3 on the workpiece carry-in side higher than a die height height H1 at the center position of the slide 10, and a die height height on the workpiece discharge side. When tilting at a tilt angle α so that the height H2 is lowered, first, the set die height height H is compared with the heights H2 and H3 at the positions of both ends of the slide 10 detected by the linear scales 30 and 31. The slide tilt correction devices 20 are simultaneously driven so that the slide 10 has a set die height height H and the slide lower surface 10a has a parallelism with the bolster 7 within an allowable range.

  For example, if the die height height H1 at the center position of the slide 10 is the set die height height H, the control device is configured to lower the carry-in die height height H3 and raise the carry-out die height height H1. The slide tilt correction device 20 is operated based on the signal instructed from the above. That is, in FIG. 7, when the slide inclination correction device 20 mounted on the carry-in side of the slide 10 is the slide inclination correction devices 20A, 20B, and 20C in order from the work loading direction (left side in FIG. 7), the slide inclination correction device. The motor 24 of 20A is driven to rotate the worm 21 in one direction to lower the left end position P1 of the slide lower surface 10a. Further, the motor 24 of the slide tilt correction device 20C is driven to rotate the worm 21 in the other direction, and the right end position P3 of the slide lower surface 10a is raised. As a result, the inclination angle α approaches approximately 0 °, and the parallelism of the slide surface, 10a, and the upper surface of the bolster 7 is within the allowable range.

  Further, for example, when the carry-out side die height height H2 of the slide 10 is set to the set die height height H, the carry-in side die height height H3 and the die height height H2 at the center position are simultaneously lowered. The slide inclination correcting device 20 is operated based on a signal commanded from the control device so as to raise the die height height H1 on the carry-out side. In this case, the movement amount at which the center position P2 of the slide lower surface 10a is lowered is approximately half the movement amount at which the left end position P1 is lowered.

  Conversely, if the carry-in die height height H3 of the slide 10 is set to the set die height height H, the carry-out die height height H1 and the die height height H2 at the center position are simultaneously raised. In this case, the movement amount at which the central position P2 of the slide lower surface 10a is lowered is approximately half of the movement amount at which the right end position P3 is lowered.

  Furthermore, as shown in FIG. 8, when there are six connection points between the plunger 8 and the slide 10, that is, when there are three points parallel to the workpiece loading direction, the slide inclination The correction apparatus 20 is arrange | positioned at each three places in the front-back direction of the slide 10 according to each connection point. In this case, it is assumed that the linear scales 30, 31, and 32 are respectively attached to the surface of the bed 4 and the slide lower surface 10a in the vicinity where the slide inclination correction devices 20 are installed. In other words, the stator 30a of the linear scale 30 is attached to the front and rear rows of the bed 4 surfaces on the work carry-in side, and the stator 31a of the linear scale 31 is attached to the front and rear rows on the carry-out side. -Mount the stator 32a of the linear scale 32 in the rear row. Further, the slider 30b of the linear scale 30 is attached to the front and rear rows on the work loading side of the slide lower surface 10a, and the slider 31b of the linear scale 31 is attached to the front and rear rows on the carry-out side.・ Movers 32b of the linear scale 32 are attached to the rear row.

  In addition, the slide inclination correction devices 20 are referred to as slide inclination correction devices 20A, 20B, 20C, 20D, 20E, and 20F in the order of the work carry-out direction from the front row work carry-in side and the work carry-out direction from the rear row work carry-in side. In this state, pressing is performed, and when the slide 10 is tilted due to the eccentric load, one of the slide tilt correction devices 20 is operated to correct the parallelism between the slide lower surface 10a and the bed 4 surface within an allowable range.

  For example, if the linear scale 30 detects that one position on the left rear side of the slide 10 is raised due to an eccentric load, the position of the slide lower surface 10a is lowered by driving the motor 24 of the slide inclination correction device 20D. The worm 21 is rotated in the direction to perform position correction.

  In addition, when the loading side and the rear side are inclined in order with the right front of the slide lower surface 10a as the center and the left rear is inclined to the maximum, the respective values based on the signals from the linear scales 30, 31, 32 are used. The motors 24 of the slide inclination correction devices 20A, 20B, 20D, 20E, and 20F are simultaneously driven to lower the position of each slide lower surface 10a. In this case, the amount of movement of the slide lower surface 10a by each slide inclination correction device 20 is corrected based on the measurement results detected by the linear scales 30, 31, and 32.

  As described above, when the slide 10 is tilted, the other position is detected with reference to any position of the slide lower surface 10a, and the die height tilt correction device 20 disposed in the vicinity thereof is adjusted in accordance with the change in the die height. Each is moved by an appropriate amount of movement. As a result, the parallelism between the slide 10 and the bed 4 is corrected so as to be within an allowable range.

  In addition, the measurement of the inclination of the slide 10 can be detected by a press-processed product without using the linear scales 30, 31, and 32. In this case, each slide inclination correction device 20 is operated by performing measurement by a manual measuring instrument or measurement by optical means and inputting the result to the control device of the press machine M.

  As described above, in the press machine M according to the embodiment, when there are at least three connection points between the plunger 8 and the slide 10, even if an eccentric load is applied to the slide 10, the slide inclination near each connection point portion. Since the correction device 20 is mounted, the inclination of the slide 10 can be corrected by operating each slide inclination correction device 20 individually. When the inclination of the slide 10 is measured, it depends on whether it is detected by the linear scales 30, 31, 32 installed in the press machine M or by a pressed product. In either case, since the vicinity of the directly inclined portion is corrected, the parallelism between the slide lower surface 10a and the bed 4 surface can be reliably kept within the allowable range.

It is a whole front view showing a press of one form of the present invention. It is the figure which showed the plane cross section of the press machine simply. It is a partial simplified sectional view which shows the connection part of the slide and plunger in FIG. It is front expansion explanatory drawing which shows the slide inclination correction apparatus in FIG. FIG. 4 is a cross-sectional plan view showing the slide tilt correction device in FIG. 3. FIG. 6 is a partially enlarged view of FIG. 5. It is a simplified front view which shows the effect | action which correct | amends the inclination of a slide. It is a simplified partial top view which shows a 6 plunger type press.

Explanation of symbols

M, press machine 1, machine frame 4, bed 7, bolster 8, plunger 10, slide 10a, slide lower surface 20, slide tilt correction device 21, worm 22, worm wheel 23, rotating shaft 24, motor 30, linear scale 31, Linear scale 32, linear scale H, die height

Claims (6)

A press machine comprising: a reciprocable slide for processing a workpiece; a drive means for reciprocating the slide; and a plunger for guiding the slide in a vertical direction and connecting the slide and the drive means. Because
The plunger is disposed so as to connect the driving unit and the slide at at least three positions along the work conveyance direction of the slide.
In the lower surface position of the slide along the axial direction of the plunger, a slide inclination correcting means for making the bed surface and the slide lower surface parallel to each other is provided in the vicinity of a connection portion between the plunger and the slide,
After detecting the inclination of the lower surface of the slide by the detecting means, among the slide inclination correcting means, the slide inclination correcting means disposed in the vicinity of the portion of the slide lower face having a large inclination is arranged on the lower surface of the slide. A press machine that is controlled and corrected so as to be parallel to the bed surface.   2. The press according to claim 1, wherein the connection parts are arranged in two rows in a direction orthogonal to the workpiece transfer direction at any or all of the at least three positions. .   The slide inclination correcting means includes a driven gear formed on the plunger, a drive gear engaged with the driven gear, and a drive source for rotating the drive gear. The press machine according to either 1 or 2.   The said detection means detects the height position from the said bed surface of the said slide by the linear scale with which it mounts | wears with multiple positions, The Claim 1, 2, or 3 characterized by the above-mentioned. Press machine.   4. The press according to claim 1, wherein the detecting means detects the inclination of the slide by measuring the thickness of the processed product.   4. The slide inclination correcting means disposed at the connecting part is moved in the height direction at the same time with respect to any one point. , 4 or 5 press machine.

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