JPH07112640B2 - Bottom dead center position correction device for press machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom dead center position correcting device for a press machine which automatically corrects the bottom dead center position of a slide.

[0002]

2. Description of the Related Art Conventionally, a general structure of a slide driving device of a press machine is shown in FIG. For example,
For example, Japanese Utility Model Publication No. 56-30479 may be mentioned. In the figure, the crankshaft 2 and the slide 10 are connected via a connecting rod 4 and a plunger 6. The upper end of the connecting rod 4 has a crankshaft 2 rotatably supported by the frame.
Is fitted in the eccentric portion 3, the lower end side of the plunger 6 is connected to the slide 10 side, and the both 4, 6 are connected by a connecting pin 8 so as to be relatively rotatable. The upper end side of the plunger 6 has a plunger guide 7 attached to the frame 1.
It is guided by sliding.

Therefore, if the crankshaft 2 is rotated,
Since the connecting rod 4 swings around the connecting pin 8,
The plunger 6 or the slide 10 can be reciprocally driven in the vertical direction.

In such a press machine, in order to adjust the bottom dead center position of the slide 10 according to the mold, an adjusting screw type slide position adjusting device (6S, 15, 15S, 11) is used.
Is provided. That is, 15 is a worm wheel mounted in the slide 10 and rotated by a worm screw (not shown), and its screw portion 15S is screwed with the screw portion 6S at the lower end of the plunger 6. That is, the hydraulic pressure in the slide lock hydraulic chamber 11 is released to remove the worm wheel 15.
By rotating, the vertical relative position of the plunger 6 and the slide 10 can be adjusted. That is, the position of the lower surface (bottom dead center) of the slide 10 with respect to the bolster can be adjusted.

By the way, the bottom dead center position of the slide 10 changes depending on various conditions even during the pressing operation. Therefore, even during the press operation, it is necessary to remove the hydraulic pressure in the slide lock hydraulic chamber 11, rotate the worm wheel 15 to adjust the bottom dead center position, and then apply hydraulic pressure again to lock. That is, the slide position adjusting device is also used as a bottom dead center position correcting device.

On the other hand, there is proposed a bottom dead center position correction device for controlling the oil temperature with respect to the temperature change of the press components as a main factor of the bottom dead center position change (for example, the actual flat blade 1- 177099).

[0007]

However, in the adjusting screw method, it is difficult to accurately correct the bottom dead center position with high accuracy because the bottom dead center position slightly changes when the hydraulic lock is applied after the adjustment. Further, if some electrical or mechanical malfunction occurs during the correction operation, the slide 10 may be lowered infinitely, which may cause a serious accident. On the other hand, in the oil temperature control method, it is necessary to install an oil temperature adjusting device, and it is extremely difficult to quantitatively and highly accurately correct the bottom dead center position change.

It is an object of the present invention to provide a bottom dead center position correction device for a press machine which can correct the bottom dead center position quantitatively, easily and quickly.

[0009]

[Means for Solving the Problems]

According to the first aspect of the present invention, the eccentric portion of the crankshaft and the slide are connected via the connecting rod and the plunger which are connected so as to be relatively rotatable via the connecting pin, and the slide is moved up and down by the rotation of the crankshaft. A bottom dead center position correction device of a press machine formed so as to be driven, the relative position adjustment being formed by vertically displacing the connecting pin to adjust the relative position between the connecting rod and the plunger in the vertical direction. Mechanism, a forced external force imparting mechanism formed to forcibly adjust the vertical relative position of the connecting rod and the plunger by applying an external force to the relative position adjusting mechanism, and a lower position detecting the bottom dead center position change of the slide. Adjusts the vertical relative position between the connecting rod and the plunger by applying an external force to the dead center position change detection means and the relative position adjustment mechanism when the bottom dead center position change is detected. And drive control means for driving and controlling a forced external force applying mechanism so as to correct the bottom dead center position change, a bottom dead center position correction apparatus of a press machine comprising comprises a.

[0011]

[Action]

According to the first aspect of the present invention, when the bottom dead center position change detecting means detects the bottom dead center position change, the drive control means drives and controls the forced external force applying mechanism. That is, the relative position adjusting mechanism displaces the connecting pin in the vertical direction by the external force to adjust the vertical relative position between the connecting rod and the plunger. That is, the substantially vertical lengths of the connecting rod and the plunger are adjusted. Therefore, for the crankshaft,
Since the slide connected via the connecting rod and the plunger can be moved and displaced in the vertical direction, the bottom dead center position can be automatically corrected so as to be always constant.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) The first embodiment is shown in FIGS. 1 to 3, and the bottom dead center position of a press machine in which a crankshaft 2 (eccentric portions 3, 3) and a slide 10 are connected by connecting rods 4, 4. It is a correction device.

This bottom dead center position correction device is provided with a support point holding mechanism 20, a forced external force applying mechanism 30, a bottom dead center position change detecting means 50 and a drive control means 40, and detects a bottom dead center position change and a crank. The rotation support points (23B, 23B) of the shaft 2 are vertically displaced to automatically correct the bottom dead center position of the slide 10.

In FIG. 1, the crankshaft 2 is rotatably supported at both ends by bearings 23B including bearings 23A. That is, both bearings 23B and 23B are the rotation support points of the crankshaft 2.

The support point holding mechanism 20 is a means for holding the rotary support points (23B, 23B) so as to be vertically displaceable. In this embodiment, as shown in FIGS. 21 and a bush 22 that rotatably holds the rotating body 21 with respect to the frame 1, and is a left and right pair.

As shown in FIG. 2, the rotating body 21 (axis Z2) is in a normal state and is eccentric by "e" in the horizontal direction on the base line L with respect to the axis Z1 of the crankshaft 1.
In other words, the rotating body 21 that rotates about the axis Z2,
The crankshaft 2 is mounted with the axis Z1 eccentric (e). Therefore, in FIG. 2, by rotating the rotating body 21 by θ about the axis Z2, the crankshaft 2 can be displaced by Δ in the vertical direction.

Next, the forced external force imparting mechanism 30 is a means for imparting an external force for forcibly rotating the rotating bodies 21, 21 about the axis Z2, and is integrated with each rotating body 21 as shown in FIG. The drive lever 31 is fixed to the drive lever 31, the equalizer shaft 32 connecting the drive levers 31 and 31, the adjusting screw shaft 35, the link bar 33 connecting the both 31 and 35, and the like.

As shown in FIG. 3, the adjusting screw shaft 35 has a screw portion 35S screwed into a screw portion 36S of a worm wheel 36 rotatably mounted in a casing 38. Therefore, if the worm screw 37 is rotated to rotate the worm wheel 36, both screw portions 36S, 35
By the cooperation of S, the adjusting screw shaft 35 can be displaced in the vertical direction.

That is, the upper end is the pin 34 and the adjusting screw shaft 35
It is possible to apply a forced external force for rotating the rotating bodies 21 and 21 about the axis Z2 via the link bar 33 and the drive lever 31 which are connected to the lower end of the rotary body and the lower end of which is connected to the equalizer shaft 32. it can. The rotation inclination angle (θ) of the rotating body 21 is defined by the rotation angle of the worm screw 37.

Next, the bottom dead center position change detecting means 50 detects the bottom dead center position of the slide 10, that is, the position change of the upper mold 54 with respect to the lower mold 53 shown in FIG. 3 in this embodiment. The position detection sensor 51 fixed to 53 and the detected object 52 fixed to the upper mold 54. From the position detection sensor 51, an electric signal proportional to the gap between the two 52 and 53, that is, the position of the bottom dead center is changed. The signal f is output.

Further, as shown in FIG. 3, the drive control means 40 comprises an adjusting motor 41 connected to the worm screw 37, a drive control unit 42 and a setting device 43. The drive control unit 42 compares the setting signal S from the setting device 43 with the bottom dead center position change signal f and outputs a control signal CNT.
42C for generating a control signal C
And a driver 42D that generates a drive signal DRV based on NT.

The setting device 43 has a position detecting sensor 5 when the bottom dead center position of the slide 10 is a predetermined position.
The predetermined value is set so that the setting signal S having the same level as the bottom dead center position change signal f output from 1 can be output.

The connecting rod 4 and the slide 10 are
Although it is directly connected via the connecting pin 12 shown in FIG. 1, the conventional adjusting screw type slide position adjusting device and the known ball shown in FIG. A bearing may be provided and a large die height adjustment may be performed using the slide position adjusting device while the press is stopped.

Next, the operation of the first embodiment will be described.
The setter 43 sets the drive signal DRV to zero (0) when the bottom dead center position of the slide 10 is at a predetermined position.
To a predetermined value. The rotating body 21 at this stage,
As shown in FIG. 2, 21 is in a posture capable of ensuring an eccentric amount e in the horizontal direction with respect to the axis Z1 of the crankshaft 2.

When the press operation is started, the crankshaft 2 rotates about the axis Z1 as shown in FIG. 1, so that the slide 10 moves up and down. Since the bottom dead center position is a predetermined position, both molds 54 and 53 can smoothly produce high precision products.

Here, it is considered that the temperature of components of the press machine rises with time and the position of the bottom dead center of the slide 10 is displaced downward. Then, the bottom dead center position change detection means 50 detects this and outputs a signal f corresponding to the bottom dead center position change. Therefore, the drive control unit 42 (controller 42C) forming the drive control means 40 generates the control signal CNT which is a correction signal, and outputs the drive signal DRV proportional thereto. As a result, the adjustment motor 41 controls the worm screw 37 to rotate in the predetermined direction. That is, the forced external force applying mechanism 30 is drive-controlled.

The worm screw 37 is replaced by the worm wheel 36.
When is rotated, the adjusting screw shaft 35 descends and the link bar 3
2 and 3, the equalizer shaft 32 is pushed downward through the shaft 3. Therefore, both drive levers 31 rotate the rotating body 21 in the clockwise direction about the axis Z2 shown in FIG. Then, the rotation support point (23
B, 23B) are eccentrically (e) fitted to the rotating body 21, so that the axis Z1 of the crankshaft 2 is the base line L of FIG.
Is pushed down more than.

Therefore, since the crankshaft 2 is displaced upward in FIG. 1, the slide 10 is pulled up via the connecting rod 4. That is, the bottom dead center position can be moved upward and corrected quantitatively and with high accuracy.

As a result, the signal f output from the position detection sensor 51 returns to the level corresponding to the predetermined bottom dead center position. The control signal CNT becomes zero (0) and the drive signal DRV disappears.

Even when the bottom dead center position is changed to the upper side, it is possible to perform the operation by reversing the above.

According to this embodiment, however, the support point holding mechanism 20, the forced external force applying mechanism 30, the bottom dead center position change detecting means 50 and the drive control means 40 are provided to detect the change in the bottom dead center position. Then, the rotation support points (23B, 2
3B) is configured to be displaced in the vertical direction,
The bottom dead center position of the slide 10 can be automatically corrected quantitatively and with high accuracy.

Further, the forced external force imparting mechanism 30 is constructed such that the vertical movement of the adjusting screw shaft 15 is converted into the inclination of the drive lever 31, and then the rotating bodies 21 and 21 are rotated about the axis Z2. Since the crankshaft 2 is formed so as to be vertically displaced by its eccentricity e, the vertical displacement can be adjusted with high accuracy, and the crankshaft 2 is excessively lowered to damage the dies 53, 54, etc. Can clean up the problem.

The rotation support point (23
(B, 23B) is vertically displaced to directly correct the bottom dead center position, so that it is not necessary to attach an oil temperature adjusting device or the like and quantitative correction can be performed.

Further, the drive control means 40 compares the signal f from the bottom dead center position change detection means 50 with the signal S from the setter 43 to generate a control signal CNT and to apply a forced external force with the drive signal DRV. Since the mechanism 30 is driven and controlled, stable correction can be continuously performed even during press operation.

(Second Embodiment) The second embodiment is shown in FIGS.
Shown in. The press machine of this embodiment has a crankshaft 2
And slide 10 (not shown in FIGS. 4 and 5)
And a connecting rod rotatably connected by a connecting pin 8.
And the plunger 6 are connected.

That is, the press structure shown in FIG. 6 is used. Therefore, an adjusting screw type slide position adjusting device (6S, 15, 15S) is incorporated between the lower end of the plunger 6 and the slide 10. However, it is omitted in FIG.

Here, the bottom dead center position correction device comprises a relative position adjusting mechanism 20A, a forced external force applying mechanism 30A, a bottom dead center position change detecting means 50 and a drive control means 40A, and detects a bottom dead center position change. The connecting pin 8 between the connecting rod 4 and the plunger 6 is vertically displaced to automatically correct the bottom dead center position of the slide 10.

As shown in FIGS. 4 and 5, the relative position adjusting mechanism includes an eccentric rotating body 21A integrally formed by eccentricity (eccentricity e) on the connecting pin 8 of the axis Z3 and the connecting rod 8 of the connecting rod 4. It is composed of a bush 22A that rotatably guides to the lower end, and is a left and right pair. The connecting pin 8 also serves as an equalizer shaft.

Therefore, as shown in FIG. 5, if the eccentric rotating body 21A is rotated about the axis Z4 by an angle θ, the connecting pin 8 can be displaced in the vertical direction, and the connecting rod 4 and the plunger 6 can be displaced. The vertical position relative to and can be adjusted. That is, the vertical position of the plunger 6 (that is, the slide 10) with respect to the connecting rod 4 can be adjusted.

On the other hand, the forced external force imparting mechanism 30A comprises a drive lever 31A, link mechanisms (33A, 33B) and a power cylinder 35A. In FIG. 5, the left end of the drive lever 31A is integrally fixed to the connecting pin 8, and the right end thereof is rotatably supported by the lower end of the link bar 33A via the pin 32A. Also, the power cylinder 35A
Includes a DC motor, a planetary speed reducer unit, a coil spring, a nut member, a screw shaft integrated with the rod 36A, and the like, and is configured to control the rotation of the DC motor to adjust the protruding / retracting amount of the rod 36A. As a whole, it is attached to the frame 1 via the trunnion pin 37A.

Therefore, the right end of the link bar 33B is rotatably connected to the lower end of the rod 36A by the pin 32C, and both link bars 33B and 33A are rotatably connected by the pin 32B. When the pin 32A, that is, the right end of the drive lever 31A is displaced in the vertical direction only by the stroke St by driving, the connecting pin 8
An external force for rotating can be applied.

The bottom dead center position change detecting means 50 is the first
This is the same as the case of the embodiment, and the drive control means 40A
Has the same configuration as (40) in the first embodiment.

Thus, in the case of the second embodiment, when the bottom dead center position change detecting means 50 detects the bottom dead center position change of the slide 10, the drive control means 40A is the same as in the first embodiment. The forced external force applying mechanism 30A is drive-controlled.
That is, the power cylinder 35A operates to tilt the drive lever 31A via the link mechanism (33A, 33B) to rotate the connecting pin 8, that is, both eccentric rotating bodies 21A, 21A.

Therefore, the vertical position of the plunger 6 with respect to the connecting rod 4 can be adjusted. That is, since the substantial total length of the connecting rod 4 and the plunger 6 can be adjusted,
The bottom dead center position can be corrected quantitatively and with high accuracy.

[0046]

【The invention's effect】

According to the first aspect of the present invention, the relative position adjusting mechanism, the forced external force imparting mechanism, the bottom dead center position change detecting means and the drive control means are provided, and the bottom dead center position change is detected to connect the connecting rod and the plunger. Since the connecting pin between them is vertically displaced to adjust the relative position of the connecting rod and the plunger in the vertical direction, the bottom dead center position of the slide can be automatically corrected quantitatively and with high accuracy, and the handling is extremely easy. It's easy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is likewise a front view of the main part.

FIG. 3 is likewise a side sectional view of a main part.

FIG. 4 is a vertical sectional view showing a second embodiment.

FIG. 5 is likewise a front view.

FIG. 6 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

 1 frame 2 crankshaft 3 eccentric part 4 connecting rod 6 plunger 7 plunger guide 8 connecting pin 10 slide 20 supporting point holding mechanism 20A relative position adjusting mechanism 21 rotating body 21A eccentric rotating body 22, 22A bush 23A bearing 23B bearing (rotating supporting point) 30, 30A Forced external force imparting mechanism 31, 31A Drive lever 32 Equalizer shaft 32A, 32B, 32C pin 33, 33A, 33B Link bar 34 Pin 35 Adjustment screw shaft 35A Power cylinder 36 Worm wheel 36A Rod 37 Worm screw shaft 37A Trunnion pin 38 Casing 40, 40A Drive control means 41 Adjusting motor 42, 42A Drive control unit 42C controller 42D driver 43 Setter 50 Bottom dead center position change detection means 51 Position detection sensor Over 52 detected member 53 lower mold 54 upper mold

Claims (1)

[Claims] 1. Relatively rotatable connection through a connecting pin.
Eccentricity of crankshaft through connecting rod and plunger
Part and slide, connect the slide, and rotate the crankshaft.
Under the press machine configured to drive the ride up and down
A dead center position correction device, in which the connecting pin is moved in the vertical direction.
Displace the connecting rod and the plunger in the vertical direction.
A relative position adjustment mechanism that can adjust the pair position,
External force is applied to the relative position adjustment mechanism of the
The vertical position relative to the jar is forcibly adjustable.
Forced external force applying mechanism and the bottom dead center position change of the slide.
Bottom dead center position change detection means for detecting
If externalization is detected, external force is applied to the relative position adjustment mechanism.
Adjust the vertical relative position between the connecting rod and the plunger.
Forced external force application mechanism to correct the bottom dead center position change
And a drive control means for controlling the drive of the press machine.
Machine bottom dead center position correction device.