JP5179772B2 - Press machine - Google Patents

Description

  The present invention relates to a press apparatus that includes a slider driven by one or a plurality of driving sources, for example, one or a plurality of electric motors, and presses a workpiece by moving the slider.

In recent years, a pressing device using an electric motor as a drive source has reached a practical range. For example, when a slider is moved with respect to a base by a force acting on each electric motor in the vicinity of a square of the slider, for example, a workpiece is pressed. The control of the electric motor may press the workpiece while maintaining the slider in a completely parallel state with respect to the base regardless of the eccentric load caused by the workpiece. (See Patent Document 1 and Patent Document 2).
Japanese Patent Publication No. 2002-263900 WO2005 / 053943A1

  In the present motor-driven press device that has reached the practical range, the slider is provided with a screw shaft that is rotated by the motor when the slider is moved up and down with respect to the base. The slider is configured to be moved up and down through the nut.

  Further, in this type of electric motor-driven press device, the rotation of the screw shaft is locked only during a relatively small movement distance of the slider under a state where the workpiece is actually being pressed. In addition, the nut side existing in the slider may be rotated.

  However, in any case, the basic configuration in which the slider moves relative to the base is a configuration in which the screw shaft is rotated by an electric motor and the slider moves up and down as the screw shaft rotates. .

  In order to reduce the overall price of the press device, instead of the conventional configuration with a base and an upper horizontal partial support plate with a structure supported by a thick gate-shaped support to the base, a portal structure is used. Omitting or trying to simplify as much as possible may occur, but in such a case, rotational blurring of the screw shaft occurs.

  In other words, in this type of electric motor-driven press device, it can be seen that even when the slider moves up and down, rotation blurring of the screw shaft occurs under a situation where efforts are made to more precisely control the level of the slider. It was. In particular, when a relatively thin and long screw shaft is used as the screw shaft, when the screw shaft is rotated, the screw shaft is likely to be shaken with respect to the axis of the screw shaft, and the slider It was found that it would be difficult to move up and down while keeping strictly horizontal.

  In order to prevent the slider from swinging in a direction parallel to the base while the slider is moving up and down, the support column is used as a guide column, and the slider is moved up and down while being supported by the support column. It has been found that the rotational shake of the screw shaft causes the horizontal shake of the slider when trying to change the conventional configuration.

  In order to solve the above problem, the present invention provides the screw shaft in a non-rotating state, with respect to a base, to a fixed portion (or support) that is fixed to the base, or to a slider. Thus, the screw shaft is prevented from rotating by being fixedly attached so as to completely prevent the rotation blur caused by the rotation of the screw shaft. That is, the slider is moved up and down by rotationally driving a nut provided on the slider, on the base, or on the fixed portion. On that basis, a screw shaft with a relatively large cross-sectional area is used, or the number of screw shafts is increased so that the slider swings in a direction parallel to the base with the entire screw shaft. I try to deter that. In other words, it is possible to omit the thick guide column that has been interposed in the conventional press apparatus and has suppressed the swing of the slider.

  As described above, even if the guide pillar is omitted, the screw shaft itself is made thicker, for example, and the screw shaft is fixed to the base or the fixed portion fixed to the base or to the slider. Since the screw shaft is fixed in a non-rotating state, the screw shaft does not cause rotational vibration compared to the conventional case where the screw shaft is rotationally driven. Therefore, it becomes possible to keep the level of the slider strictly while the slider moves up and down.

  5 and 6 are explanatory diagrams of the configuration considered in the invention development stage. 5 is a front view, and FIG. 6 is a top view. 5 and 6 correspond to configurations in which the gate-type structure is omitted in order to simplify the structure in the press devices disclosed in Patent Documents 1 and 2 described above.

  5 and 6, 1 is a base, 2 is a horizontal part of the legs that support the base, 3 is a vertical part of the legs, 4-1, 4-2. The slider 5 is fixed upright and fixed to the base 1, and 5 is a slider provided so that the workpiece is pressed between the slider 5 and the base 1. .., 6-2,... Are motors constituting a drive source, 7-1, 7-2,... Are screw shafts that are rotationally driven by the motors 6-1, 6-2,. 1, 8-2... Are nuts fixed to the slider 5 at, for example, four corners of the slider 5, 9-1, 9-2... Are linear scales, the base 1 and the guide pillar 4. It is attached to the upper end of -i so that the height position of the slider 5 can be measured. In addition, the arrow 100-i shown by FIG. 6 represents the rotation direction of the screw shaft 7-i.

  The screw shaft 7-i is rotated by driving by the electric motor 6-i. The slider 5 is provided with a hole through which the screw shaft 7-i is penetrated and a hole through which the guide pillar 4-i is penetrated. Further, the nut 8-i is fixed to the slider 5 as described above.

  As the screw shaft 7-i rotates, the slider 5 integrated with the nut 8-i is moved up and down along the guide pillar 4-i in a sliding state.

  The linear scale 9-i measures the height position of the slider 5 in the vicinity of the position where the nut 8-i is attached. That is, it is measured by the linear scale 9-i whether or not the slider 5 is moved up and down in a completely correct horizontal state.

  In consideration of omitting the portal structure in the press devices disclosed in Patent Documents 1 and 2, generally, the motor 6-i is configured to be attached to the base 1 and is fixedly attached to the base 1. Each corresponding screw shaft 7-i is rotationally driven by the electric motor 6-i.

  In the structure in which the guide column 4-i shown in FIGS. 5 and 6 is present, the slider 5 is slidably supported by the guide column 4-i. Oscillation in a direction parallel to 1 can be almost prevented.

  However, in order to further simplify the structure, when the guide column 4-i is to be omitted, the guide column 4-i is provided by the screw shaft 7-i with the diameter of the screw shaft 7-i being increased. Make it functional. In such a structure, even when the diameter of the screw shaft 7-i is increased, if an attempt is made to constitute a press device having a large moving distance of the slider 5, the screw shaft 7-i becomes so long as to be so long. Since the screw shaft 7-i is rotationally driven, rotational blurring occurs on the screw shaft 7-i.

  1 and 2 show a configuration of an embodiment of the present invention. FIG. 1 shows a front view with a part shown in cross section and a part omitted, and FIG. 2 shows a top view.

  Reference numeral 1 denotes a base, 5 denotes a slider, 6-i denotes an electric motor, 7-i denotes a screw shaft, 8-i denotes a nut, and 9-i denotes a linear scale.

  In FIG. 1, the horizontal portion 2 of the leg and the vertical portion 3 of the leg that support the base shown in FIG. 5 are omitted. Also, the naturally existing motor 6-2 and the naturally existing linear scale 9-1 are omitted from FIG.

  As can be seen from FIGS. 1 and 2, the screw shaft 7-i is firmly fixed to the base 1 so as not to rotate and to move in the vertical direction. Each of the nuts 8-i meshes with the corresponding screw shaft 7-i, but the slider 5 can be rotated around the screw shaft 7-i by the corresponding electric motor 6-i. ing.

  That is, the rotating shaft of the electric motor 6-i is connected to the rotating shaft 12-i of the illustrated small gear 11-i by the illustrated coupling 10-i. As a result, the small gear 11-i is rotationally driven by the electric motor 6-i via the rotary shaft 12-i supported by the bearing 13-i. On the other hand, the nut 8-i is mechanically attached to the cylindrical body 15-i that is held so as to be rotatable with respect to the slider 5 and not vertically movable with respect to the slider 5 by the thrust receiver 14-i. It is fixed to. Needless to say, the inner peripheral surface of the cylindrical body 15-i is supported by a guide (not shown) with respect to the screw shaft 7-i and is opposed to the screw shaft 7-i through a slight gap. The central portion of the large gear 16-i meshing with the small gear 11-i is mechanically fixed to the outer peripheral surface of the cylindrical body 15-i.

  The thrust receiver 14-i is provided on the inner peripheral surface of the cylindrical annular body 17-i fitted to the slider 5. As described above, the cylindrical body 15-i is formed by the large gear 16-i. The cylindrical body 15-i can be rotated around the screw shaft 7-i, but the cylindrical body 15-i is held so that the cylindrical body 15-i cannot move in the illustrated vertical direction with respect to the cylindrical annular body 17-i. Yes.

  Accordingly, the cylindrical body 15-i is rotationally driven by the electric motor 6-i via the small gear 11-i and the large gear 16-i, and the nut 8-i rotates around the peripheral surface of the screw shaft 7-i. When being moved, the slider 5 moves up and down together with the cylindrical annular body 17-i in a non-rotating state with respect to the screw shaft 7-i.

  As described above, the workpiece (not shown) is disposed between the base 1 and the slider 5 and is pressed by a press die (not shown) as is well known.

  In the illustrated case, there are four electric motors 6-i, and forces are applied in the downward direction to the four corners of the slider 5 during press working. During this time, each of the four electric motors 6-i is controlled independently of each other, and the slider 5 functions to maintain a correct horizontal state in the illustrated case. Furthermore, the electric motors 6-i are operated independently of each other so that the slider 5 maintains the horizontal state correctly at each predetermined height position where the slider 5 descends.

  Needless to say, when the workpiece is pressed, an eccentric load is applied to the slider 5 depending on the shape of the workpiece, and it is generally difficult to lower the slider 5 while maintaining the horizontal state correctly.

  However, as already described in Patent Document 1 by the applicant of the present application, the slider 5 is lowered at a very low speed in the trial stage of press working, and the slider 5 is being pressed while being subjected to eccentric load. For each height position, the height positions of the four corners of the slider 5 are measured by the four linear scales 9-i. For each height position, in order for the height positions of the four corners of the slider 5 to show equal values, it is determined what driving force should be exerted on each motor 6-i. To do. That is, for each height position, the conditions for controlling the individual motors 6-i are determined, the rotational speed and / or torque for driving the motors 6-i are determined, and the low-speed press working is being performed. During the descent, the electric motors 6-i are driven independently of each other so that the slider 5 maintains the correct horizontal state at each height position.

  Next, the descending speed of the slider 5 is slightly increased, and similarly, during the press working at the descending speed, conditions for operation control in which the slider 5 is in the correct horizontal state are determined for each height position. In this manner, while gradually increasing the descending speed of the slider 5, the slider 5 finally maintains the correct level for each height position under the desired descending speed during the press working. Therefore, an operation control condition for each electric motor is determined.

  If the trial stage during this period is the so-called teaching process stage, the operation control condition for each motor 6-i is determined so that the press work is performed while the slider 5 is kept horizontal at the end of the teaching process stage. The Then, in the next production processing stage, each motor 6-i is controlled independently of each other so that the motor 6-i is operated under the operation control conditions obtained previously. .

  In order to measure the height positions of the four corners of the slider 5 at each height position in the teaching stage described above, as described above, the four linear scales 9-i are provided. The lower end of each linear scale 9-i is fixed to the base 1 by the scale bracket fixing portion 18-i, but the upper end is relative to the support bar 19-i attached to the upper end of the screw shaft 7-i. It is supported by the scale bracket support portion 20-i so as to be movable in the vertical direction. That is, each linear scale 9-i is fixed to the base 1 in parallel so as to follow each screw shaft 7-i. However, the screw shaft 7-i undergoes thermal expansion and deformation due to processing during press working. Since each linear scale 9-i is not affected by the thermal expansion of the screw shaft 7-i and deformation due to processing, each linear scale 9-i is provided at the scale bracket support portion 20-i. -The upper end of the scale 9-i is supported so that it can move up and down. Needless to say, the scale is engraved on the linear scale 9-i, and the state in which the pointer slightly protruding from the slider 5 side moves up and down by the change in the height position of the slider 5 is measured.

  In the configuration clearly shown in FIG. 1, the screw shaft 7-1 and the screw shaft 7-2 are opposite to each other in the direction of threading, and the nut 8-1 is rotated when the slider 5 is lowered, for example. The driving direction and the rotational driving direction of the nut 8-2 are opposite to each other.

  By rotating in the opposite direction in this way, unnecessary vibration that may occur when the motor 6-i is rotated in the same direction and the nuts 8-1 are simultaneously rotated in the same direction is prevented as much as possible. Like to do.

FIG. 3 shows another embodiment in which the drive unit is fixedly attached to the base.
Reference numerals 1 to 20 in the figure correspond to those in FIG. 1, and reference numeral 21 denotes a support, which is a plate-like member provided so as to connect the upper portions of a plurality of screw shafts 7-i. . Reference numeral 22-i denotes a spline shaft, which is a rotary shaft with a spline cut in place of the rotary shaft 12-i shown in FIG. 1, 23-i is a holding brake for the spline shaft 22-i, and 24-i is a support ring. And which is rotated together with the spline shaft 22-i which is driven to rotate, but which is slid to an arbitrary height position on the axis of the spline shaft 22-i and supports the spline shaft 22-i, Reference numeral 25-i denotes a support ring holding portion, which can rotate as the slider 5 moves up and down and moves the support ring 24-i in the vertical direction with respect to the spline shaft 22-i. Is. The small gear 11-i is fixed to the support ring 24-i, and is rotationally driven together with the spline shaft 22-i and the support ring 24-i that are rotationally driven.

  Further, the support 21 is replaced with a support bar 19-i shown in FIG. 1 that is individually provided at the upper end of each screw shaft 7-i. It is provided so as to connect each other. By providing such a plate-like support body 21, even when a large eccentric load is applied, a plurality of screw shafts 7-i having a possibility of individual screw shafts 7-i swinging together. They will work to deter each other.

  The mode in which the press working in the case of the configuration of FIG. 3 is performed is substantially the same as the case shown in FIG. However, the electric motor 6-i as each drive source is only fixedly attached to the base 1.

  That is, when the electric motor 6-i is rotationally driven, the spline shaft 22-i rotates, and the support ring body 24-i and the small gear 11-i are rotated. As a result, the large gear 16-i is rotated, and the nut 8-i is rotated via the cylindrical body 15-i. In response to the rotation of the nut 8-i, the slider 5 is lowered, for example, and press working is performed. Corresponding to the lowering of the slider 5, the support ring holding portion 25-i is also lowered, and the support ring 24-i is lowered along the spline shaft 22-i. More specifically, as the slider 5 moves up and down, the support ring 24-i, the small gear 11-i, the large gear 16-i, and the nut 8-i move up and down all at once.

  In the configuration shown in FIG. 3, the screw shaft 7-1 and the screw shaft 7-2 are screw shafts cut in the same direction, but the screws cut in opposite directions as shown in FIG. The use of axes is not an essential requirement.

FIG. 4 shows another embodiment in which the screw shaft is attached to the slider in a non-rotating state.
Reference numerals 1 to 18 in the figure correspond to FIG. 1, and reference numeral 21 denotes a support corresponding to the support shown as existing in FIG.

  4 is basically the same as the case shown in FIGS. 1 and 3, but the screw shaft 7-i is not rotated with respect to the slider 5 and moved in the axial direction. It is fixed in the state that does not. The nut 8-i is fixed to the base 1 side so as to be rotatable with respect to the base 1 and not moved in the axial direction of the screw shaft 7-i. The electric motor 6-i is attached to the base 1.

  When the electric motor 6-i is rotated, the large gear 16-i is rotationally driven via the small gear 11-i. Then, as shown in FIG. 1, the nut 8-i is rotationally driven, and the screw shaft 7-i is moved up and down simultaneously with respect to the base 1. That is, the slider 5 fixed to the screw shaft 7-i is moved up and down. Of course, the support 21 shown in FIG. 4 also moves up and down as the slider 5 moves up and down.

  In the case shown in FIG. 4, the lower end of the linear scale 9-i is fixed to the base 1, and the upper end of the linear scale 9-i is arranged along the slider 5.

  In FIG. 4, the electric motor 6-i is attached to the base 1. However, in the configuration shown in FIG. 4, the position where the electric motor 6-i is present and the position where the nut 8-i is present may be separated as in the case shown in FIG. 3. That is, the electric motor 6-i is attached to the slider 5 side in FIG. 4, and the nut 8-i is driven to rotate through the spline shaft 22-i as in the case of the configuration shown in FIG. Good.

  Furthermore, in FIG.1, FIG3 and FIG.4, the base 1 is shown as what is located in the lower part of a press apparatus. However, if there is any sturdy fixing part (not shown) where the base 1 is connected to the press device, the base is reversed in FIGS. 1, 3 and 4. The table 1 itself may be considered as the fixed part. That is, in the case of FIGS. 1 and 3, the screw shaft 7-i may be fixed to the fixing portion in a non-rotating state. In the case of FIG. 4, the nut 8-i is fixed to the fixing portion in a rotatable state.

  Further, the plate-like support 21 shown in FIGS. 3 and 4 is fixed to the base 1 as a structure that is sufficiently stronger than the support 21 in the state shown in FIGS. As the structure, an electric motor 6-i as a drive source shown in FIGS. 3 and 4 may be fixedly attached to the structure.

The front view of one Example structure of this invention is shown. The top view of the structure shown in FIG. 1 is shown. The other Example at the time of attaching a drive part to a base fixedly is shown. Another embodiment when the screw shaft is attached to the slider in a non-rotating state is shown. It is explanatory drawing about the structure considered in the invention expansion | deployment stage, and is a front view. FIG. 6 is a top view of the configuration shown in FIG. 5.

Explanation of symbols

1: Base 5: Slider 6: Electric motor 7: Screw shaft 8: Nut 9: Linear scale 11: Small gear 14: Thrust receiver 15: Cylindrical body 16: Large gear 17: Cylindrical annular body 18: Scale bracket Fixed part 20: Scale bracket support part

Claims (7)

A base, provided with several screw shaft double that exist perpendicular to the base board, and a slider that extends in a direction perpendicular to the base and parallel to and the screw shaft, and the base In a press device in which a workpiece is placed in a space between the slider and the workpiece is pressed by a pressing force associated with the movement of the slider.
With prior several screw shaft Kifuku is fixed to a non-rotating state with respect to the fixed portion that is fixed relative or base with respect to the base,
The slider, the screwed before several screw shaft Kifuku with double several nuts, supported rotatably relative to each of the screw shaft and the screw in a rotatable state relative to the slider Held in a non-moving state in the direction of the axis,
And several nuts before Kifuku is rotated by respective drive sources,
Furthermore, the slider is a hole penetrating the slider, before several screw shaft Kifuku is configured to have only holes through,
One of the screw shafts present in pairs is configured to have a screw formed so as to have a screw direction opposite to the screw direction of the other screw shaft and the corresponding even number. One of the nuts is rotationally driven in a direction opposite to the rotational direction of the other nut,
Before several screw shaft Kifuku by those plurality few screw shaft, the slider is characterized in that it is configured so as to suppress the position variation swings the base in a direction parallel press apparatus. Several nuts before Kifuku, respectively, is supported on the slider is rotated by a driving source which moves together with the slider,
By the rotation of those plurality few nuts, the press apparatus according to claim 1, wherein said slider is moved in the direction away a direction approaching the base. Several nuts before Kifuku, respectively, are rotated by a driving source is fixed and supported on or the fixing portion is supported on the base,
By the rotation of those plurality few nuts, the press apparatus according to claim 1, wherein said slider is moved in the direction away a direction approaching the base. The plurality of screw shafts are present at the end opposite to the end fixed to the base or the fixing portion, and the support or the base is present so as to connect the plurality of screw shafts to each other. The press device according to claim 1, wherein the press device is supported by a support member that is fixed to the support member. A scale that measures the moving position of the slider that moves relative to the base;
The scale is provided corresponding to each of the screw shafts, and the moving position of the slider in the vicinity of the position where the nuts corresponding to the screw shafts are supported by the slider is measured. The press apparatus according to claim 1, wherein: Each of the plurality of scales is
One end is fixedly attached to the base,
The other end is plural at the end on the side where the screw shaft is not fixed to the base or the fixing portion, or at the end on the side where the screw shaft is not fixed to the base or the fixing portion. A support that is fixed to the base by supporting the end that is not fixed to the base or to the fixing portion on a support that exists so as to connect the screw shafts to each other. The press device according to claim 5, wherein the press device is supported so as to be movable in the longitudinal direction of the screw shaft. A base and a slider provided in parallel to the base;
One or a plurality of screw shafts that exist perpendicularly to the slider, and a workpiece is placed in a space between the base and the slider, and is subjected to pressure applied by the movement of the slider In a press device in which the workpiece is pressed,
The one or more screw shafts are fixed in a non-rotating state with respect to the slider;
One or a plurality of fixed portions fixed to the base or the base are screwed onto the one or the plurality of screw shafts and are rotatably supported with respect to each of the screw shafts. Holding the nuts in a rotatable state with respect to the base or the fixed portion and in a non-moving state in the direction of the screw shaft,
And each of the one or more nuts is rotated by a driving source,
Furthermore, the base or the fixing part is configured to have only a hole through which the one or a plurality of screw shafts pass as a hole penetrating the base or the fixing part.
The one or the plurality of screw shafts are configured to suppress positional fluctuations in which the slider swings in a direction parallel to the base by the one or more screw shafts. Press machine.

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