JP2004202501A - Variable speed driving device in mechanical press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving device in a mechanical press having low height with which the rotation of a variable speed motor is not needed to inverse, and the accuracy of a bottom dead center is good even without performing a special control and a torque of the variable speed motor is not needed to proportionally increase according to the increase of the press load. <P>SOLUTION: The variable driving device in the mechanical press is used for a slide-guiding mechanism, and the mechanical press without using a connecting rod, is constituted of driving with the variable speed motor. Since the conventional member corresponding to the connecting rod is unnecessary, the height of the mechanical press can be lowered and also, descending and ascending speeds of a slide can freely be changed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a drive device for a mechanical press in which a slide guide mechanism and a variable speed motor are combined.
[0002]
[Prior art]
Although there are many structures of a drive device of a mechanical press, as a device using a variable speed motor, a device that raises and lowers a slide by a screw mechanism is general. (For example, refer to Patent Document 1.) The mechanical press mainly uses a screw mechanism, and is therefore called a screw press.
[0003]
The mechanical press of the screw mechanism has the following properties. I. It is necessary to reverse the rotation of the variable speed motor at the bottom dead center. B. The position accuracy of the bottom dead center depends on the timing at which the variable speed motor is rotated in the reverse direction. C. The required torque of the variable speed motor is proportional to the pressing load. These properties are not welcome as properties of a mechanical press.
[0004]
There is also a mechanical press that connects a variable speed motor to a crank mechanism and moves the slide up and down by the crank mechanism. (See, for example, Patent Document 2.) There is also a mechanical press having a structure in which a knuckle mechanism is operated by a variable speed motor and a screw mechanism, and a slide is moved up and down by the knuckle mechanism. (For example, see Patent Document 3)
[0005]
According to Patent Document 2, the height of the mechanical press is increased due to the presence of the connecting rod. Similarly, according to Patent Literature 3, the height of the mechanical press is increased due to the knuckle mechanism. Increasing the height of the mechanical press is not welcome because the height of the building where the mechanical press is installed increases. Note that the variable speed motor includes an induction motor with an inverter, an inverter motor, and the like in addition to the servomotor.
[0006]
[Patent Document 1]
JP-A-10-272600
[Patent Document 2]
JP 2000-288792
[Patent Document 3]
JP 2002-103089A
[0007]
[Problems to be solved by the invention]
The present invention provides a welcome mechanical press. That is, the invention of the present application does not require reversing the rotation of the variable speed motor, has good bottom dead center accuracy without special control, and increases the torque of the variable speed motor proportionally with an increase in the press load. It is an object of the present invention to provide a drive device for a mechanical press which does not need to be operated and has a short height.
[0008]
[Means for Solving the Problems]
In the present invention, a mechanical guide without a connecting rod is driven by a variable speed motor using a sliding guide mechanism. More specifically, the invention according to claim 1 is characterized in that a slide guide mechanism for converting the rotational motion of the eccentric portion of the crankshaft into a reciprocating linear motion by cooperating with a slide of a mechanical press is provided above the adjusting member, In a mechanical press provided with a position adjustment mechanism below the adjust member to make it advance and retreat while being prevented from rotating, the crank shaft is driven to rotate by a variable speed motor. According to a second aspect of the present invention, in addition to the first aspect, the sliding guide mechanism has an eccentric portion of the crankshaft incorporated in a frame, and the eccentric portion is configured to be capable of reciprocating within the frame. . According to a third aspect of the present invention, in addition to the first or second aspect, the position adjusting mechanism changes a relative position between the slide and the adjusting member by a screw mechanism.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
In FIG. 1, a slide 3 is provided on a frame 2 of a mechanical press 1 so as to be movable up and down, and a bolster 4 is fixed to the frame 2 so as to face the slide 3. A vibration isolator 5 is fixed to the lower end of the frame 2, and blocks vibration of the mechanical press from the foundation.
[0010]
The slide 3 is guided by the slide guide 18 so as to be movable up and down with respect to the frame 2.
[0011]
In FIG. 2, a crankshaft 8 is provided on the frame 2. The crankshaft 8 is rotatably supported by bearings provided on the frame 2, and is disposed in the front-rear direction with respect to the frame 2. A main gear 9 is fixed to the crankshaft 8. The main gear 9 rotates integrally with the crankshaft 8.
[0012]
The servo motor 11 is fixed to the frame 2. A pinion gear 10 is provided on an output shaft of the servo motor 11. The output shaft of the servo motor and the pinion gear 10 are prevented from rotating, and both rotate integrally. The pinion gear 10 and the main gear 9 mesh with each other. The pinion gear 10 and the main gear 9 constitute a speed reduction mechanism. The mechanical press is a one-step deceleration.
[0013]
A brake 23 is provided between the frame 2 and the servo motor 11. That is, a brake plate provided on the shaft of the servo motor 11 and a device for pressing the brake plate are provided.
[0014]
An eccentric portion 8a of the crankshaft 8 is provided. The sliding guide mechanism 6 is engaged with the eccentric portion 8a. A position adjusting mechanism 7 is provided below the sliding guide mechanism 6. Hereinafter, these structures will be described with reference to FIG.
[0015]
In FIG. 3, a slide guide mechanism 6 is provided above the adjustment member 12, and a position adjustment mechanism 7 is provided below the adjustment member 12. The cap 13 is fixed with bolts 14 with the spacer 15 interposed between the adjusting members 12. A frame having a space in the center is formed by the adjusting member 12, the spacers 15, 15 and the cap 13.
[0016]
The eccentric portion 8a of the crankshaft 8, the upper slider 16 and the lower slider 17 are accommodated in the space. The upper slider 16 and the lower slider 17 are engaged above and below the eccentric portion 8a, so that the upper slider 16 and the cap 13 are slidable, and the lower slider 17 and the adjustment member 12 are slidable. The upper slide 16, the lower slide 17, the adjustment member 12, the cap 13, the spacer 15, and the like constitute the slide guide mechanism 6.
[0017]
The upper slider 16 and the lower slider 17 move relative to the frame in the lateral direction. The slider comprises an upper slider 16 and a lower slider 17 and is a so-called split type slider. In contrast to the integrated slider, the split slider does not require a space for providing a bolt for integrating the upper and lower sliders, that is, the width is small, and the clearance between the inside and the outside of the slider is halved. , Etc.
[0018]
A screw rod 12 a is formed at the lower end of the adjusting member 12. A nut 21 is screwed onto the screw rod 12a. The nut 21 is incorporated in the slide 3 so as to be freely rotatable and restricted in vertical movement.
[0019]
The nut 21 is held on the slide 3 by a retainer 22. A worm gear 20 is formed on an outer portion of the nut 21. The worm gear 20 meshes with a worm shaft 19 rotatably provided on the slide 3. The worm shaft 19 is configured to rotate by a motor (not shown). The screw rod 12a, the nut 21, the worm gear 20, the worm shaft 19, and the like constitute a position adjusting mechanism 7, which corresponds to a so-called slide adjusting means.
[0020]
The position adjusting mechanism 7 of the present embodiment uses a screw mechanism, but may use a hydraulic pressure. That is, a hydraulic cylinder may be provided below the adjusting member 12 to control the amount of oil so that the adjusting member 12 advances and retreats with respect to the slide 3. Alternatively, a taper block may be provided below the adjustment member 12, and the adjustment member 12 may be moved forward and backward with respect to the slide 3 by the taper block.
[0021]
The adjusting member 12 is guided by a slide for the purpose of preventing unexpected rotation. That is, it is necessary to prevent the adjustment member 12 from rotating during operation and thereby changing the slide adjustment amount. Therefore, as shown in FIG. 3, the guide member 3 is provided with a guide hole 3a formed in the slide 3 so that the adjustment member 12 is allowed to move up and down in the vertical direction with respect to the slide 3 and is prevented from rotating. In the case of the present embodiment, the guide hole 3a is a square hole (rectangle). In the case of the present embodiment, the adjusting member 12 is directly guided by the slide 3. However, the structure may be such that the slide 3 is nested and guided by the nest.
[0022]
4, 5 and 6 show another embodiment. In the other embodiment, two-stage deceleration is performed while the first embodiment is one-stage deceleration. That is, in the first embodiment, the speed is reduced by the pinion gear 10 and the main gear 9, but in other embodiments, the speed is reduced by the pinion gear 10 and the intermediate gear 24, and further by the intermediate pinion 25 and the main gear 9. Being slowed down.
[0023]
Otherwise, there is no difference between these two embodiments. That is, the sliding guide mechanism 6 and the position adjusting mechanism 7 remain unchanged in both. Therefore, hereinafter, the other embodiment will be described with reference to FIGS. 4, 5, and 6, but the points overlapping with the first embodiment will be omitted. 5 and 6 show left side views, but FIG. 6 shows the arrangement of various gears and the like in an expanded manner in order to facilitate understanding of power transmission.
[0024]
A servo motor 11 is fixed to a frame 2 of a mechanical press 1. The pinion gear 10 is provided on the servo motor shaft 27. The servo motor shaft 27 and the pinion gear 10 are prevented from rotating with each other and rotate integrally.
[0025]
An intermediate pin 26 is provided on the frame 2. Both ends of the intermediate pin 26 are fixed to the frame 2 so that the intermediate pin 26 cannot rotate.
[0026]
An intermediate gear 24 and an intermediate pinion 25 are rotatably fitted into the intermediate pin 26. That is, the intermediate pin 26 is inserted into the hole of the intermediate gear 24 and the intermediate pinion 25, and the intermediate gear 24 and the intermediate pinion 25 are rotatable. In this embodiment, the intermediate gear 24 and the intermediate pinion 25 are formed integrally. They may be created separately and fixed to each other.
[0027]
The intermediate gear 24 meshes with the pinion gear 10, and the intermediate pinion 25 meshes with the main gear 9 fixed to the crankshaft 8. Other configurations are the same as those of the first embodiment as described above.
[0028]
In FIG. 3, when the worm shaft 19 rotates, the worm gear 20 and the nut 21 rotate, and the adjusting member 12 moves up and down by the screw mechanism. The elevation amount is a so-called slide adjustment amount of the mechanical press. The adjustment member 12 can move forward and backward with respect to the slide 3.
[0029]
【The invention's effect】
According to the present invention, since a member corresponding to the conventional connecting rod is not required, the height of the mechanical press can be reduced, and the descending and rising speeds of the slide can be freely changed.
[Brief description of the drawings]
1 is a rear view of a partial cross section. FIG. 2 is a left side view of a partial cross section. FIG. 3 is a cross sectional view of a main part of a slide. FIG. 4 is a rear view of a partial cross section of another embodiment. Left side view of a partial cross section of another embodiment [FIG. 6] Left side view of a partial cross section of another embodiment (expanded view)
[Explanation of symbols]
1 is a mechanical press, 2 is a frame, 3 is a slide, 3a is a guide hole, 4 is a bolster, 5 is a vibration isolator, 6 is a slide guide mechanism, 7 is a position adjustment mechanism, 8 is a crankshaft, 8a is an eccentric part, 9 is a main gear, 10 is a pinion gear, 11 is a servomotor, 12 is an adjusting member, 12a is a screw rod, 13 is a cap, 14 is a bolt, 15 is a spacer, 16 is an upper slider, 17 is a lower slider, and 18 is a slide. A guide, 19 is a worm shaft, 20 is a worm gear, 21 is a nut, 22 is a retainer, 23 is a brake, 24 is an intermediate gear, 25 is an intermediate pinion, 26 is an intermediate pin, and 27 is a servo motor shaft.

Claims (3)

A slide guide mechanism that converts the rotational movement of the eccentric portion of the crankshaft into a reciprocating linear movement by cooperating with the slide of the mechanical press is provided on the upper side of the adjusting member, and the slide guide mechanism can move forward and backward while being prevented from rotating with respect to the slide. A variable-speed driving device for a mechanical press, wherein the crankshaft is rotationally driven by a variable-speed motor in a mechanical press having a position adjusting mechanism provided below the adjusting member. The variable speed drive of a mechanical press according to claim 1, wherein the sliding guide mechanism has an eccentric portion of the crankshaft incorporated in a frame, and the eccentric portion is configured to be reciprocally movable in the frame. apparatus. 3. The variable speed driving device for a mechanical press according to claim 1, wherein the position adjusting mechanism is configured to change a relative position between the slide and the adjusting member by a screw mechanism.

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