JPH1190690A - Screw-driven mechanical press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a press, of which large-size of the frame is suppressed and the weight is reduced, by arranging side by side a plurality of units of machining stations, which raise or lower a slide by driving a screw mechanism by a servo motor, and enabling each slide to be raised or lowered independently simultaneously or with a phase difference. SOLUTION: The press is provided with six units of machining stations M1-M6, the slide SL of which is each capable of vertically moving independently. As a result, compared with machining by a transfer press, the die height for example is adjustable more easily, suppressing generation of eccentric load, and enabling efficient press working. In addition, each slide SL1-SL6 is raised or lowered with a phase difference d, thereby timewisely dispersing a load imparted to a frame 1 or a crossbeam 2, so that the press is small-sized and light weight to reduce installation cost. On the basis of such constitution, the press can be used as plural independent small machines or also as an integrated large machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw-type mechanical press in which a plurality of processing stations for raising and lowering a slide by driving a screw mechanism with a servomotor are arranged in parallel.

[0002]

2. Description of the Related Art As a conventional technique for performing a multi-step press working, a mold of a required process is attached to one slide or a plurality of slides, and a blank material or a semi-finished product is successively placed in an adjacent metal mold. 2. Description of the Related Art Transfer presses that are transported to a mold and continuously press-processed in multiple steps are well known.

[0003]

However, such a transfer press has the advantage of being able to press continuously in multiple steps, but since the total working load of all the dies is simultaneously applied to the transfer press frame and cross beam. Therefore, it is necessary to have a structure having high rigidity, so that the frame becomes large, the weight of the transfer press increases, and the equipment cost increases.

In addition, in the transfer press, since a plurality of dies having different processing loads are attached to one slide, the load center of the total processing load does not coincide with the machine center.
It is inevitable to generate eccentric loads. For this reason, inconveniences such as a reduction in product accuracy and a reduction in the life of the mold are inevitable.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to temporally disperse a processing load applied to a frame or a cross beam, thereby suppressing an increase in the size of the frame, reducing the weight, and reducing equipment costs. With the eccentric load
It is to provide a screw type mechanical press.

[0006]

In order to solve the above-mentioned problems, a screw-type mechanical press according to the present invention comprises a plurality of processing stations for driving a screw mechanism by a servomotor to raise and lower a slide. The slides can be moved up and down independently or simultaneously with an arbitrary phase difference (claim 1).

In the above screw type mechanical press,
Slides of a plurality of arbitrary processing stations are connected by a slide plate mounted on the lower surface thereof, and the elevation of all the connected slides is synchronously controlled (claim 2). Alternatively, slides of any of a plurality of processing stations are connected by a slide plate mounted on the lower surface thereof, and except for any of the connected slides, lifting and lowering of other slides are synchronously controlled ( Claim 3).

Further, in the above invention, each slide is provided with an identification means for judging a type and a connection state of a slide plate mounted on the slide (claim 4).

Further, in each of the above-mentioned inventions, the apparatus is provided with a setting means for setting an allowable load.

[0010]

Embodiments of the present invention will be described in detail below with reference to the drawings. Drawing 1 is a side view of the partial section showing an example of the screw type mechanical press of the present invention,
FIG. 2 is also a front view.

In this screw-type mechanical press, six working stations M1 to M6 are juxtaposed on a cross beam 2 spanned between four frames 1. Then, in each processing station, the rotation of each servo motor SM1 to SM6 is
It is transmitted to the connecting rod 13 via the pulley 15, the belt 16 and the pulley 14.

Each of the processing stations M1 to M6 is provided with a hydraulic chamber composed of a cylinder 21 and a piston 22. The cylinder 21 is fixed on a cross beam 2 laid on a frame 1. The piston 22 rotatably holds the connecting rod 13 via upper and lower tapered roller bearings 23 and 24.

The lower end of the connecting rod 13 is fixed to a male screw mechanism 11, and a slide SL is fixed to the lower end of a female screw mechanism 12 screwed to the screw mechanism 11. ing. Therefore, the servo motor SM
Is driven, the slide SL depends on the rotation direction.
Goes up and down.

A rotary encoder 19 is attached to the servo motor SM, and the amount of rotation of the servo motor SM can be detected, so that the vertical displacement of the slide SL can be accurately controlled. The slide SL when the servo power is turned off is provided on the upper end of the connecting rod 13.
An electromagnetic brake 17 is provided as a lock mechanism for preventing the fall of the vehicle.

In the screw type mechanical press shown in FIG.
Slides SL1 to SL of each processing station M1 to M6
The slide plates 6 are provided with slide plates SP1 to SP6, respectively. Since the displacement of each of the slides SL1 to SL6 is set in advance as shown in FIG. 7A, each of the slides SL1 to SL6 moves up and down with a slight phase difference d (FIG. 2). ing.

That is, as shown in the system diagram of FIG. 3, the screw-type mechanical press according to the present invention includes a servo central processing unit (CPU) and a main CPU that comprehensively controls information of the servo CPU. It is numerically controlled (NC). Therefore, a signal from the main CPU is sent to the servo amplifier provided for each processing station via the servo CPU, and power switching for driving each servo motor SM is performed. They are raised and lowered independently, simultaneously, or with an arbitrary phase difference.

As a discriminating means for discriminating the type and connection state of the slide plate mounted on the slide SL, a proximity sensor 18 is incorporated in each slide plate SP. The dog provided in the SL is detected, and the setting conditions for the dog that has detected such information are sent to the main CPU which has been input in advance. It is possible to input such information to the main CPU without using such identification means. However, by using the identification means, the operation can be simplified and input errors can be prevented.

In the example described above, each slide SL is independently raised and lowered with an arbitrary phase difference d. However, an arbitrary plurality of slides SL or all the slide SLs are raised and lowered synchronously. In some cases.

Next, in a state where a plurality of arbitrary slides SL are connected by the slide plate SP, another slide SL is connected.
And the case of raising and lowering with an arbitrary phase difference d will be described.

In the screw-type mechanical press shown in FIG. 4, the processing stations M1 and M2 and the processing stations M3 and M4
And two slides S for each of the processing stations M5 and M6
L is the slide plate SP7, SP8, SP respectively
9 are connected. The displacement of each set of slides SL is as shown in FIG. 7B.

Then, as shown in FIG. 6B, for example, when the slide SL1 and the slide SL2 are connected by the slide plate SP7, the two proximity sensors 18 incorporated in the slide plate SP simultaneously detect. hand,
The information is sent to the main CPU by the above-mentioned identification means for judging that the slide SL1 and the slide SL2 are connected by the slide plate SP7 which is twice as long as the standard slide plates SP1 to SP6.
The main CPU issues a command for synchronous control of the servo motors SM1 and SM2 to the servo CPU. Similarly, slide SL3, slide SL4, and slide SL
5 and the slide SL6 are sent to the main CPU by the identification means for determining that they are connected by the slide plate SP8 and the slide plate SP9.
3 and the servo motor SM4 and the servo motor SM5 and the servo motor SM6 also issue a synchronous control command.

The example shown in FIG. 6 (c) is similar to the above example, except that three stations M1, M2, M
3 slides SL1, SL2, and SL3 are one slide plate SP10.
This is a case where SL5 and SL6 are connected by a slide plate SP10. Also in this case, three servo motors SM1, SM2, SM3 and servo motors SM4, SM
5, SM6 is synchronously controlled.

In the example shown in FIG. 6D, the slide SL
1 and slide SL3 are one slide plate SP12
, But the middle slide SL2 is not connected. Similarly, slide SM4 and slide SM6 are connected by one slide plate SP13.
The middle slide SL5 is not connected. Then, the slide plate SP12 and the slide plate S
The proximity sensor corresponding to the slide SL2 and the slide SL5 is not provided in P13. Therefore, the servo motor SM1, the servo motor SM3, and the servo motor SM4
And the servo motor SM6 are controlled synchronously.

However, the servo motor SM2 and the servo motor SM5 stop driving, or the servo motors SM1 and SM3 or the servo motors SM4 and SM
The slides SL2 and SL5 can be moved up and down without performing synchronous control with M6. Further, in a special case, the slides SL2, SL5 not connected by the slide plates SP12, SP13 are set at the bottom dead center on both adjacent slides SL1, SL3, S5 in order to improve the product accuracy.
L4, SL6, slightly shifted from the servomotors SM1, SM3 on both sides or the servomotors SM4, SM6
It is also possible to drive in synchronization with the control. Note that the same control is also possible in the example shown in FIG.

In the screw type mechanical press shown in FIG. 5, six processing stations M1, M2, M3, M4, M5, M
All six slides SL1 to SL6 are connected by one slide plate SP14. Then, as shown in FIG. 6 (e), the six proximity sensors 18 incorporated in the slide plate SP14 are communicated by a conducting wire in a state where the dog of the slide SL is detected. Therefore, the slides SL1 to SL6 are made up of one slide plate SP14.
The above-mentioned identification means determines that the connection is established by the above, and sends the information to the main CPU, so that the main CPU instructs the servo CPU to perform synchronous control of all the servo motors SM1 to SM6. At this time, the slides SL1 to SL6 are as shown in FIG.
Is displaced as shown in FIG.

Also in this example, an arbitrary slide SL is separated from the slide plate SP14 and stopped at a top dead center, moved up and down synchronously or asynchronously with another slide SL, or set at a bottom dead center. Other slide SL
Can be shifted slightly.

The configuration of the screw-type mechanical press according to the present invention has been described above. Advantageous points when the die is mounted on the slide plate SP and the press working is performed will be described below.

The screw-type mechanical press shown in FIG. 2 has six processing stations M1 to M6, and the slide SL of each processing station can be moved up and down independently. For example, the die height can be easily adjusted and the occurrence of an eccentric load can be suppressed, so that the press working can be performed efficiently. In addition, each slide SL1 to SL6 is
By raising and lowering each with a phase difference, the processing load applied to the frame 1 and the cross beam 2 can be dispersed over time, so that the screw type mechanical press can be reduced in weight and size, and the equipment cost can be reduced. Can be done.

In the screw-type mechanical press shown in FIG. 3, two working stations M1, M2, two working stations M3, M4 and two working stations M5, M6 adjacent to each other are used.
Slide SL1, SL2, slide SL3, SL4 and slide SL5, SL6 are slide plate SP7,
Since they are connected by SP8 and SP9 and the elevation of the slides SL1 and SL2, slides SL3 and SL4, and slides SL5 and SL6 are controlled synchronously, the length is twice as long as the standard case described above. The material can be processed using a mold. In this example,
In some cases, two standard dies are attached to the slide plates SP7, SP8, and SP9, respectively.

Similarly, in the example shown in FIG. 6C, press working can be performed using a mold having a length up to three times the standard length.

In the example shown in FIG. 6C, when the slide plate is mounted on the slides SL1, SL2 and SL3, the bottom dead center of either the slide SL1 and the slide SL3 or the slide SL2 is adjusted slightly. As compared with the case where all three slides SL1 to SL3 are synchronously controlled, for example, the deflection of the slide plate SP10 can be corrected, and a highly accurate molded product can be obtained. In this case, slide SL
2 is moved up and down with a phase difference slightly delayed from the up and down movement of the slides SL1 and SL3 on both sides, so that the effect can be further enhanced. However, in this case, since the slides SL1 to SL3 are synchronously controlled by the above-described identification means using the proximity sensor 18 of the slide plate SP10, it is necessary to input to the main CPU that the slide SL2 is moved up and down with a slightly delayed phase difference. is there.

As another example, as shown in FIG. 6D, it is possible to stop the slide SL2 at its top dead center and press only the slides SL1 and SL3 on both sides. Further, in a state where the slide SL2 is not connected to the slide plate SP10, as described above,
Synchronize with the raising and lowering of slides SL1 and SL3 on both sides,
Alternatively, it may be moved up and down without synchronization.

In the screw-type mechanical press shown in FIG. 5, since the vertical movement of the six slides SL1 to SL6 can be controlled synchronously, a mold having a length six times the standard length can be used. It is. In this example as well, the mold is formed by raising or lowering any slide with a slight phase difference from other slides or by making the bottom dead center of any slide slightly different from the bottom dead center of other slides. It is possible to cope with the partial wear and the deflection of the cross beam 2 during the press working.

In the screw-type mechanical press of the present invention, each of the cylinders 21 is provided at each of the processing stations M1 to M6.
And a hydraulic chamber composed of a piston 22 and supplying pressurized oil to the hydraulic chamber. A function of detecting the hydraulic pressure, converting the hydraulic pressure into a load, and comparing with a preset allowable load. To the main CPU. Therefore, when the detected value of the oil pressure exceeds the set value, the drive of the servomotor SM of the processing station M and all the processing stations connected to the processing station by the slide plate SP is immediately stopped, and the other processing stations are stopped. Then, when the slides SL reach the top dead center, the driving of the servo motors SM is stopped.

The setting means for setting the allowable load includes a keyboard for inputting the set value, a display for displaying the set value and confirming the set value, and a main CPU for storing the set value in the memory. Become.

In this example, the load is detected by detecting the oil pressure in the hydraulic chamber. However, a load sensor may be provided at that position to detect the load.

In the above embodiment, the screw mechanisms 11, 1
Although the two are described as male and female threads that are screwed together, a combination of a ball screw shaft and a ball screw nut can also be used.

Although the description has been made on the assumption that the number of working stations of the screw-type mechanical press is six, the present invention can be implemented by arranging at least two in parallel. Further, the slide SL and the slide plate S shown in FIG.
The combination of the connection with P is merely an example, and other combinations can be implemented.

[0039]

The screw-type mechanical press according to the present invention is configured as described above, and has the following effects.

A plurality of processing stations for raising and lowering slides by driving a screw mechanism with a servomotor are arranged in parallel, and each of these slides can be raised and lowered independently at the same time or with an arbitrary phase difference. Even a screw type mechanical press can be used as a plurality of independent small machines at times, and sometimes as an integrated large machine, so that press working can be performed efficiently.

Since each slide can be independently raised and lowered with an arbitrary phase difference, the processing load applied to the frame or cross beam of the screw type mechanical press can be dispersed over time.
It is possible to reduce the weight and size of the screw-type mechanical press and reduce the cost of equipment.

Slides of a plurality of arbitrary processing stations are connected by a slide plate mounted on the lower surface thereof,
By synchronously controlling the elevation of all the connected slides, it is possible to perform press working with a mold that is enlarged in the length direction corresponding to the slide plate.

Slides of a plurality of arbitrary processing stations are connected by a slide plate mounted on the lower surface thereof,
Of the connected slides, only arbitrary slides are lifted and lowered with a slight phase difference without adjusting synchronously with the lifting and lowering of other slides, and by adjusting the bottom dead center, mold wear and cross beam distortion etc. The precision press working can be performed by eliminating the influence of.

Each slide is provided with an identification means for determining the type and connection state of the slide plate mounted on the slide, so that the information can be directly transmitted to the main C.
Compared with the case of inputting to the PU, the input operation can be simplified and input errors can be prevented.

Setting means for setting an allowable load,
If the drive of the servomotor is stopped when the processing load exceeds the set value, an accident such as breakage due to overload can be prevented.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view showing an example of a screw-type mechanical press according to the present invention.

FIG. 2 is a front view of a partial cross section of the screw-type mechanical press shown in FIG.

FIG. 3 is a system diagram for explaining a numerical control system of the screw-type mechanical press shown in FIG. 2;

FIG. 4 is a front view showing a state in which slides of two adjacent processing stations are connected by a slide plate in the screw-type mechanical press shown in FIG. 2;
is there.

5 is a front view showing a state in which slides of all processing stations are connected by one slide plate in the screw-type mechanical press shown in FIG. 2;

FIG. 6 is an explanatory diagram showing an example of a combination of connection of each slide and various slide plates.

FIG. 7 is an explanatory diagram showing a displacement when an arbitrary slide is moved up and down with a synchronization or a phase difference in a state of being separated or connected.

[Explanation of symbols]

1 is a frame, 2 is a cross beam, 11 and 12 are screw mechanisms, 13
Is a connecting rod, 14 and 15 are pulleys, 16 is a belt, 17 is an electromagnetic brake, 18 is a proximity sensor, 19 is a rotary encoder, 21 is a cylinder, 22 is a piston, and 23 and 24.
Is a tapered roller bearing, M is a machining station, SL is a slide, SM is a servomotor, SP is a slide plate,
d is the phase difference.

Claims (5)

[Claims] 1. A plurality of processing stations for raising and lowering slides by driving a screw mechanism by a servomotor and arranging the slides independently and simultaneously or with an arbitrary phase difference. A screw-type mechanical press characterized by the following. 2. The slides of a plurality of processing stations are connected by a slide plate mounted on the lower surface thereof.
The screw-type mechanical press according to claim 1, wherein the elevation of all the connected slides is controlled synchronously. 3. The slides of any of a plurality of processing stations are connected by a slide plate mounted on a lower surface thereof.
The screw-type mechanical press according to claim 1, wherein lifting and lowering of other slides are controlled synchronously except for an arbitrary slide among the connected slides. 4. The screw-type mechanical press according to claim 2, wherein each slide is provided with identification means for determining a type and a connection state of a slide plate mounted on the slide. 5. The screw-type mechanical press according to claim 1, further comprising setting means for setting an allowable load.