JP2007203360A - Slide driving system for servo press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slide driving system for a servo press, which has a high degree of freedom in arranging and selecting an actuator and in which it is easy to set pressing characteristics. <P>SOLUTION: The slide driving system 10 comprises a toggle mechanism 20 equipped with a first link 22 and a second link 24 which are pivotally connected at one end, and a driving link 26 pivotally connected to the first link 22 which transfers the driving force of the actuator 12 to the first link 22. The other end of the first link 22 is pivotally connected to a part of the crown 6 of the servo press 1. The other end of the second link 24 is pivotally connected to the slide 5. The first link 22 has a pivotal point (power input point a2) with the driving link 26 in a place separate from the pivotal point (power output point a3) with the second link 24. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a slide drive mechanism that converts a drive force of a drive source in a servo press into a slide up / down motion via a toggle mechanism (knuckle mechanism).

Some conventional servo presses include a slide drive mechanism that converts the drive force of a drive source into a slide lifting motion via a toggle mechanism (also referred to as a knuckle mechanism).
In general, the toggle mechanism includes a first link and a second link that are pivotally attached to each other, and the other end of the first link is pivotally attached to a part of the crown, and the other end of the second link is A drive link is pivotally attached to a connecting point between the first link and the second link.

In the toggle mechanism having such a configuration, when the drive link is moved forward and backward with respect to the first and second links by the linear actuator, the toggle shape constituted by the first link and the second link is deformed so as to open and close. Thus, the slide moves up and down. By adopting such a toggle mechanism, the slide speed near the bottom dead center can be made slower than the crank mechanism, so the moving section (high speed, no pressure) and the pressure section (low speed, large pressure) ) Can be satisfied.
Patent Documents 1 to 4 listed below disclose prior art related to a slide drive mechanism that employs a toggle mechanism.

  The slide drive mechanism described in FIG. 8 of Patent Document 1 has an upper arm (first link) and a lower arm (second link) that are axially attached to each other at one end, and a connection point between the upper arm and the lower arm. Is connected to the horizontal slider through a transmission mechanism, and the connection rod connected to the horizontal slider is moved horizontally with respect to the upper and lower arms. The slide is moved up and down by advancing and retracting.

  In the slide drive mechanism of Patent Document 2, a first nut member and a second nut member are screwed into a screw member arranged in a horizontal direction with a right screw portion and a left screw portion as targets, and the first nut member Each of the second nut members is provided with a toggle-shaped link member composed of an upper link and a lower link. A ram is pivotally attached to the lower end portion of the lower link, and the screw member is rotated to connect the first nut member and the second nut member. By moving closer and away, the toggle shape is deformed to raise and lower the ram.

  The slide drive mechanism of Patent Document 3 connects a first link pivotally attached to a crown and a second link pivotally attached to a plunger via a three-axis link having three axis attachment points. The slide is moved up and down by moving the link in the horizontal direction with a carrier (drive link).

  The slide drive mechanism of Patent Document 4 includes a multi-threaded screw that is arranged in the vertical direction and is driven to rotate, a lifting body that is screwed into the multi-threaded screw and can be lifted and lowered as the screw rotates, A multi-link mechanism for connecting between the slide and the slide is provided, and the slide is moved up and down via the lifting body and the multi-link mechanism by rotating the multi-threaded screw.

Japanese Patent Publication No.3-333439 JP-A-8-206882 JP 2003-290984 A Japanese Patent Laid-Open No. 2001-300778

In the slide drive mechanisms disclosed in Patent Documents 1 to 3, the linear motion actuator as a drive source is structurally limited to horizontal placement, and thus cannot be placed vertically. Moreover, in the slide drive mechanism of patent document 4, since a linear motion actuator is limited to vertical installation, this cannot be horizontal installation. As described above, in the conventional technology, when a certain slide drive mechanism is employed, the arrangement of the actuator is limited to either horizontal or vertical, and the arrangement is also limited to a specific position. For this reason, in the case of horizontal placement, the device width becomes large, and in the case of vertical placement, the device height becomes high. However, since the actuator arrangement is limited, there is a problem that the factory layout is likely to be restricted.
In the design stage of the slide mechanism of Patent Documents 1 to 4, when setting the press characteristics (sliding speed and load in the moving section, pressurizing section, the relationship between the actuator stroke and the sliding stroke, etc.), the actuator and toggle mechanism There is a problem that adjustment of dimensions of a plurality of parts to be configured is necessary, and setting of press characteristics is complicated.
Further, in the slide drive mechanisms of Patent Documents 1 to 4, the actuator stroke can be changed unless the distance between the link fixing point (the upper end of the first link) and the power output point (the lower end of the second link) is changed. Since this is not possible, there is a problem that the degree of freedom in selecting the output and speed of the actuator is low.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a slide drive mechanism of a servo press that has a high degree of freedom in arrangement and selection of actuators and that allows easy setting of press characteristics. To do.

In order to solve the above problems, the slide driving mechanism of the servo press according to the present invention employs the following means.
That is, the slide drive mechanism of the servo press according to the present invention is a slide drive mechanism that converts the drive force of the actuator in the servo press into a lift movement of the slide via a toggle mechanism constituted by a plurality of link members, The toggle mechanism includes a first link and a second link that are pivotally attached to one end, and a drive link that is pivotally attached to the first link and transmits the driving force of the actuator to the first link. The other end of one link is pivotally attached to a part of the crown of the servo press, the other end of the second link is pivotally attached to the slide, and the first link is a pivot point with the second link. It has an axis attachment point with the drive link in another part.

In this way, the first link has a shaft landing point (power input point) with the drive link at a part different from the shaft landing point with the second link. The position of the point can be determined. In other words, it is possible to arrange any actuator by changing the position of the power input point. For example, vertical and horizontal as well as diagonal arrangements are possible. In addition, since the degree of freedom of arrangement of the actuator can be improved in this way, restrictions on the factory layout are reduced.
Moreover, since the press characteristics can be changed only by changing the shape of the first link, that is, by adjusting the positions of the three pivot points on the first link, it is easy to set the press characteristics.
In addition, by adjusting the position of the shaft landing point (power input point) between the first link and the drive link, the shaft landing point between the first link and the crown is fixed to the second link and the slide. The actuator stroke can be arbitrarily set without changing the dimensions and member strength up to the point (power output point). For this reason, the degree of freedom in selecting the output and speed of the actuator is improved.

  Further, in the slide drive mechanism of the servo press according to the present invention, a triangle having each axis landing point as an apex is formed by each axis landing point of the first link, the crown, the second link, and the drive link. It is formed.

  In this way, a triangle having apexes at the three axis attachment points (fixed point, power input point, power output point) is formed, so that the actuator can be easily arranged even in the vertical direction. In addition, it is possible to easily adjust to an arbitrary press characteristic simply by changing the shape of the triangle.

  In the slide drive mechanism of the servo press according to the present invention, the first link and the pivot point of the crown, and the line segment connecting the pivot point of the first link and the second link, It is characterized in that one link and the drive link have a pivot point.

  As described above, the first link and the drive link are arranged on a line segment connecting the first link and the pivot landing point (fixed point) of the crown and the first link and the second link pivot landing point (power output point). Therefore, it is possible to easily adjust to an arbitrary press characteristic only by changing the position of the power input point on the line segment.

  In the slide drive mechanism of the servo press according to the present invention, the actuator is a linear actuator.

  When a linear actuator is used, the width of the device increases when placed horizontally, and the height of the device increases when mounted vertically.According to the present invention, however, the degree of freedom in placement of the actuator is high. Placement is possible. That is, even when the linear actuator is used, there are few restrictions on the factory layout.

  According to the present invention, it is possible to improve the degree of freedom of arrangement and selection of the actuator, and to obtain an excellent effect that the press characteristics can be easily set.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the common part in each figure, and the overlapping description is abbreviate | omitted.

[First Embodiment]
FIG. 1 is a diagram showing a configuration of a servo press 1 having a slide drive mechanism 10 according to a first embodiment of the present invention. FIG. 1 (A) shows a state in which a slide 5 is at a bottom dead center position. ) Shows a state in which the slide 5 is at the top dead center position. In FIG. 1, only the left half of the servo press 1 is shown, but the right half is configured in a similar manner symmetrically with the left half.
In FIG. 1, in the servo press 1, a column 4 (also referred to as an upright) is erected on a bed 3 on which a bolster 2 is fixed, and a crown 6 is provided on the column 4. A slide 5 is supported on the column 4 so as to be movable up and down. A lower die (not shown) is attached to the upper surface of the bolster 2, and an upper die (not shown) is attached to the lower surface of the slide 5. The crown 6 is provided with a slide drive mechanism 10 that drives the slide up and down.

In FIG. 1, a slide drive mechanism 10 includes an actuator 12 serving as a drive source, and a toggle mechanism 20 that converts the drive force of the actuator 12 into a slide up / down motion.
In the present embodiment, the actuator 12 is a linear motion actuator incorporating a rack and pinion mechanism, and includes a servo motor 13, a speed reducer 14 that decelerates the rotation of the servo motor 13, and a pinion (not shown) in the speed reducer 14. The rack member 15 meshing with the rack member 15 is converted into a vertical linear motion of the rack member 15 by a rack and pinion mechanism, and the head unit 16 provided at the tip of the rack member 15 is moved up and down. It has become.

  In addition to the rack and pinion mechanism, the actuator 12 may be a linear motion actuator 12 such as a ball screw mechanism or a linear motor. Moreover, you may apply a crank mechanism as described in FIG. 2 of the said patent document 1 (Japanese Patent Publication No. 3-33439).

  The toggle mechanism 20 includes a first link 22 and a second link 24 that are axially attached to each other, and a drive link 26 that is axially attached to the first link 22 and transmits the driving force of the actuator 12 to the first link 22. ing. The other end of the first link 22 is pivotally attached to a support portion 28 provided on the crown 6, and the other end of the second link 24 is pivotally attached to the slide 5. One end of the drive link 26 is pivotally attached to the first link 22, and the other end is pivotally attached to the head portion 16 of the actuator 12.

A shaft landing point a <b> 1 between the first link 22 and the support portion 28 is a fixed point that does not move due to the operation of the toggle mechanism 20. However, the support portion 28 may be configured to be movable up and down for slide adjustment. In this case, the fixed point a1 moves during slide adjustment.
The axis landing point a <b> 2 between the first link 22 and the drive link 26 is a power input point where the drive force from the actuator 12 is input to the toggle mechanism 20 via the drive link 26. The axis landing point a3 between the first link 22 and the second link 24 is a power output point at which driving force is output.

  The first link 22 has an axis landing point with the drive link 26 at a site different from the axis landing point with the second link 24. In the present embodiment, a triangle having apexes at the fixed point a1, the power input point a2, and the power output point a3 is formed.

  In the slide drive mechanism 10 configured as described above, when the head portion 16 of the actuator 12 is raised, the first link 22 pivots clockwise in FIG. 1 around the fixed point a1, and the first link 22 and the first link 22 As the two links 24 rotate and the toggle shape is deformed in the closing direction, the slide 5 rises (A → B operation). On the contrary, when the head portion 16 of the actuator 12 is lowered, the first link 22 turns counterclockwise in FIG. 1 around the fixed point a1, and the first link 22 and the second link 24 rotate. When the toggle shape is deformed in the opening direction, the slide 5 is lowered (B → A operation).

According to the slide drive mechanism 10 according to the present embodiment, the first link 22 has a shaft landing point (power input point a2) with the drive link 26 at a site different from the shaft landing point with the second link 24. Therefore, the position of the power input point a2 can be determined in accordance with the arrangement of the actuator 12. In other words, any actuator 12 can be arranged by changing the position of the power input point a2. For example, vertical and horizontal as well as diagonal arrangements are possible. In addition, since the degree of freedom of arrangement of the actuators 12 can be improved in this way, restrictions on the factory layout are reduced.
Further, since a triangle having apexes of the fixed point a1, the power input point a2, and the power output point a3 is formed, the actuator 12 can be easily arranged even in the vertical direction.

Further, only by changing the shape of the first link 22, that is, by adjusting the positions of the three shaft landing points (the fixed point a1, the power input point a2, and the power output point a3) in the first link 22, press characteristics can be improved. Since it can be changed, setting of press characteristics is easy. In this embodiment, it is possible to easily adjust to an arbitrary press characteristic simply by changing the shape of the triangle.
For example, when the length of the fixed point a1 and the power input point a2 is L1, and the length of the fixed point a1 and the power output point a3 is L2, a large load can be obtained when L1 / L2 is large. The mechanism requires a long stroke and is suitable for a high-speed actuator. Conversely, when L1 / L2 is small, a long slide stroke can be obtained with a short actuator stroke, and the mechanism is suitable for a low-speed actuator.

  Further, when a linear motion actuator is used as the actuator 12, the width of the apparatus increases in the horizontal position and the height of the apparatus increases in the vertical position. However, according to the slide drive mechanism 10 according to the present invention, the actuator 12 Can be arranged according to the factory layout. That is, even when the linear actuator is used, there are few restrictions on the factory layout.

FIG. 2 is a diagram illustrating a configuration of two slide drive mechanisms 10 having different shapes of the first link 22. In FIG. 2, illustration of the other components of the servo press 1 in FIG. 1 is omitted.
2A and 2B, the position of the power input point a2 of the first link 22 and the actuator stroke (Sa1, Sa2) are different, but the length from the fixed point a1 to the power output point a3. The length of the second link 24 and the slide stroke (Ss1, Ss2) are the same.
Thus, according to the slide drive mechanism 10 of the present invention, by adjusting the position of the power input point a2, the dimension from the fixed point a1 to the power output point a3, the length of the second link 24, and the slide stroke can be adjusted. The actuator stroke can be set arbitrarily without change. For this reason, the degree of freedom in selecting the output and speed of the actuator 12 is high.

[Second Embodiment]
FIGS. 3A and 3B are diagrams showing the configuration of the toggle mechanism 20 in the slide drive mechanism according to the second embodiment of the present invention, where the bottom dead center position is a solid line and the top dead center position is a virtual line. It is drawn in. The actuators in the slide drive mechanisms (A) and (B) are horizontally placed so that the head portion 16 performs a horizontal linear motion. Also, (A) and (B) differ in the installation height of the actuator by h. The configuration of the servo press 1 other than the slide drive mechanism 10 is the same as in FIG.
As described in the first embodiment, according to the slide drive mechanism 10 according to the present invention, any actuator 12 can be arranged, so that the actuator 12 can be placed horizontally. In FIG. 3, the slide 5 moves up and down as the head portion 16 of the actuator 12 moves in the horizontal direction (left and right in FIG. 3).

The lower diagram of FIG. 3 shows the relationship between the actuator stroke and the slide stroke in the slide drive mechanism 10 of (A) and (B). As shown in FIG. 3, in the slide mechanism of (A), the residence time near the bottom dead center is longer than in (B).
Thus, in the slide drive mechanism 10 of the present invention, the press characteristics change depending on the position of the actuator 12. Therefore, an arbitrary press characteristic can be set by adjusting the arrangement of the actuator 12.

  Even when the actuator 12 is placed vertically as in the first embodiment, an arbitrary press characteristic can be set by adjusting the arrangement of the actuator 12 in the horizontal direction (left-right direction in FIG. 1).

[Third Embodiment]
FIG. 4 is a diagram showing the configuration of the slide drive mechanism 10 according to the third embodiment of the present invention, in which the bottom dead center position is drawn with a solid line and the top dead center position is drawn with a virtual line.
The point which the 1st link 22 has the axial landing point with the drive link 26 in a site | part different from the axial landing point with the 2nd link 24 is the same as that of 1st and 2nd embodiment mentioned above. However, in the present embodiment, the first link 22 is a linear member, and the first link 22 and the crown landing point (fixed point a1) and the first link 22 and the second link 24 are pivoted ( On the line connecting the power output point a3), the first link 22 and the drive link 26 have a shaft landing point (power input point a2).
The configuration of the servo press 1 other than the slide drive mechanism 10 is the same as that shown in FIG.

  In the slide drive mechanism 10 configured as described above, when the head portion 16 of the actuator 12 is raised, the first link 22 pivots clockwise in FIG. 1 around the fixed point a1, and the first link 22 and the first link 22 As the two rings rotate and the toggle shape is deformed in the closing direction, the slide 5 rises (solid line → virtual line operation). On the contrary, when the head portion 16 of the actuator 12 is lowered, the first link 22 turns counterclockwise in FIG. 1 around the fixed point a1, and the first link 22 and the second link 24 rotate. When the toggle shape is deformed in the opening direction, the slide 5 is lowered (operation of virtual line → solid line).

Also in the slide drive mechanism 10 according to the present embodiment, the first link 22 has a shaft landing point with the drive link 26 at a site different from the shaft landing point with the second link 24 (as in the first embodiment). Since the power input point a2) is provided, it is possible to arrange an arbitrary actuator 12 by changing the position of the power input point a2, thereby improving the degree of freedom of arrangement of the actuator 12. There are fewer constraints on the layout.
In addition, the press characteristics can be changed simply by adjusting the positions of the three shaft landing points (fixed point a1, power input point a2, power output point a3) in the first link 22, so that the press characteristics can be easily set. It is. In the present embodiment, since the power input point a2 is provided on the line segment connecting the fixed point a1 and the power output point a3, it is easily adjusted to an arbitrary press characteristic only by changing the position of the power input point a2. be able to.

  Note that the configuration of the third embodiment described above may also be a configuration in which the actuator is placed horizontally as in the second embodiment shown in FIG.

[Other Embodiments]
In the description of the second embodiment described above, it has been described that the press characteristics can be changed depending on the arrangement position of the actuator 12, but as shown in FIG. A position adjusting means 30 for moving the actuator 12 in the horizontal direction may be provided after being configured to be horizontally movable. Further, as shown in FIG. 5B, when the actuator 12 is placed horizontally, the actuator 12 is configured to be movable in the vertical direction, and a position adjusting means 30 for moving the actuator 12 in the vertical direction is provided. May be.
In the example of FIG. 5, the position adjusting means 30 is a hydraulic cylinder device, but other direct acting actuators such as a rack and pinion, a ball screw mechanism, and a linear motor may be applied.
If the position adjusting means 30 is provided as described above, the desired press characteristics can be adjusted by adjusting the position of the actuator 12 when it is desired to change the press characteristics.

As described above, as is apparent from the description of each embodiment, according to the present invention, it is possible to improve the degree of freedom of arrangement and selection of actuators and to easily set the press characteristics. Effect.

  Although the embodiments of the present invention have been described above, the embodiments of the present invention disclosed above are merely examples, and the scope of the present invention is not limited to these embodiments. . The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

It is a figure which shows the structure of the servo press provided with the slide drive mechanism concerning 1st Embodiment of this invention. It is a figure which shows the structure of two slide drive mechanisms from which the shape of a 1st link differs. It is a figure which shows the structure of the slide drive mechanism concerning 2nd Embodiment of this invention. It is a figure which shows the structure of the slide drive mechanism concerning 3rd Embodiment of this invention. It is a figure which shows the structure of the slide drive mechanism concerning other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Servo press 2 Bolster 3 Bed 4 Column 6 Crown 10 Slide drive device 12 Actuator 13 Servo motor 14 Reducer 15 Rack member 16 Head part 20 Toggle mechanism 22 First link 24 Second link 26 Drive link 28 Support part 30 Position adjustment means a1 Fixed point a2 Power input point a3 Power output point

Claims (4)

A slide drive mechanism that converts the drive force of an actuator in a servo press into a slide up / down motion via a toggle mechanism composed of a plurality of link members,
The toggle mechanism includes a first link and a second link that are pivotally attached to each other, and a drive link that is pivotally attached to the first link and transmits the driving force of the actuator to the first link.
The other end of the first link is pivotally attached to a part of the crown of the servo press, and the other end of the second link is pivotally attached to the slide.
The first link has an axis landing point with the drive link at a site different from the axis landing point with the second link.
A slide drive mechanism of a servo press characterized by that.   2. The triangle having the pivot points as apexes is formed by the pivot points of the first link, the crown, the second link, and the drive link. Servo press slide drive mechanism.   The first link and the drive link have a pivot point on a line segment connecting the first link and the pivot point of the crown, and the first link and the second link. The slide drive mechanism of the servo press according to claim 1.   The slide drive mechanism of the servo press according to claim 1, wherein the actuator is a linear actuator.

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