KR20050055027A - Press - Google Patents

Abstract

A press comprising a servo motor (6), a ball screw (9), and a roller guide (11) in which machining accuracy is enhanced while reducing the overall size and weight, noise and vibration, and power consumption of the press.

Description

Press Machine {PRESS}

The present invention relates to a press machine used for plastic processing or cutting of a metal sheet, for example, by extrusion molding, extrusion punching, tightening, and the like.

As a press machine of this kind, which is known from the prior art, for example, as disclosed in Japanese Patent Laid-Open No. 2002-224889, a pressure-reducing member that freely slides on a base plate and presses a workpiece to a motor. There is a configuration in which the pressing member is driven up and down through the flywheel and the crankshaft by the rotational driving force of the motor by connecting to the rotationally interlocked flywheel through the crankshaft.

In addition, as disclosed in Japanese Patent Application Laid-open No. Hei 8-174097, the other corresponds to an upper tarlet (pressing member) having a punch for punching a workpiece by freely supporting the slide lift. ), And the flywheel is attached to the drive shaft of the inclined plate type variable displacement hydraulic pump that supplies the compressor oil to the hydraulic cylinder, and the belt is driven by the motor.

Again, it has been known in the art to use pneumatic cylinders instead of the above-described hydraulic cylinders.

In these conventional press machines, the inertia inertia of the flywheel is used to average the fluctuations in the rotational speed of the motor and to accumulate the rotational energy to ensure a predetermined press working, while rotating the flywheel having a large mass. The noise and vibration generated by the motor are very large, which is one of the causes of the deterioration of the working environment.

In addition, in the conventional press machine equipped with a flywheel, the existence of the flywheel itself is not only a limiting factor for the miniaturization and weight reduction of the machine, but also a lot of waste of power consumption since the rotation of the flywheel is continued at all times other than during press processing.

This is more noticeable in large press machines with a large maximum pressing force.

In addition, in the press machine, in order to improve the processing accuracy, it is preferable that flexible motion control is performed in accordance with the processed product such as the operating speed, the position of the pressing member, the lifting stroke, and the like, and the optimum processing conditions are always set. In the above conventional press machine with flywheel, it is difficult to realize controllability for such a high precision machining.

1 is a front view of the whole press machine to which the embodiment of the present invention according to claims 1 to 5 and 9 is applied.

2 is a side view of FIG. 1

3 is a cross-sectional view taken along the line X-X of FIG.

4 is an enlarged side view of the roller portion of the roller guide member serving as the lifting guide means of the pressing member;

5 is an enlarged horizontal cross-sectional view of the main part of the roller guide member.

6 is a partial cutaway perspective view showing the configuration of the drive unit

7 is a partially cutaway perspective view showing the detailed structure of a ball screw.

8 is a front view of the whole press machine to which the embodiment of the present invention according to claims 1, 6 and 8 is applied.

9 is a side view of FIG. 8

10 is an overall plan view of FIG.

FIG. 11 is a cross sectional view taken along the line Y-Y of FIG.

The present invention has been made in view of the above situation, and low noise, low vibration, small size and light weight, and low power consumption, the operation cost can be reduced, moreover, the operation control and the data of the processing conditions enable the press working precision. It is an object of the present invention to provide a press machine capable of realizing a significant improvement.

In order to achieve the above object, the press machine according to the present invention described in Claim 1 includes a motor supported on a base plate, a lifting mechanism lifted by the rotational driving of the motor, and fixedly connected to a lower end of the lifting mechanism. A press machine having a pressing member for pressing, wherein the motor is constituted by a servo motor capable of rotation control by a control mechanism, and the lifting mechanism is screwed to the ball screw shaft and the ball screw shaft. The ball screw nut and the ball screw having a ball group that engages in the electric groove formed in the ball screw nut and the ball screw nut so as to be capable of electric movement, either one of the ball screw shaft and the ball screw nut of the elevating mechanism It is characterized in that it is connected to the drive shaft side rotationally connected to the servomotor, the other side is fixedly connected to the pressing member side.

According to the present invention as defined in claim 1 having the above configuration requirements, since the drive mechanism of the pressing member is composed of a combination of a servo motor and a ball screw capable of rotation control, the flywheel is not used at all. In addition to miniaturization and weight reduction of the entire machine, there are no motor noises and vibrations associated with the rotational driving of the flywheel, and the working environment can be greatly improved.

In addition, wasteful power consumption during processing standby and rest is eliminated, and operation cost can be drastically reduced by reducing power consumption.

In addition, the combination of a ball screw with low friction and good mechanical efficiency and a servo motor with automatic tracking performance can be applied to a wide range of press processing of large and small pressures as required power output throughout the entire stroke. It is possible to flexibly and precisely control the operation speed, the position, the lifting stroke, and the like of the pressing member in accordance with the processed product, and the predetermined press can realize a significant improvement in the process density.

In particular, as described in claim 2, an additional control mechanism for the servomotor is configured as an NC control unit capable of setting and inputting the data of the press machining conditions, thereby facilitating the operation order changing operation and increasing the accuracy. As a result, the press can achieve a significant improvement in productivity while improving the process density.

As the embodiment of claim 3, the lifting member of the pressing member in the press machine according to the present invention having the above-described configuration includes: a rail fixed to the base side, a lifting block fixed to the pressing member side; It is preferable to use a plurality of roller guides whose outer circumferential surfaces are made of rollers which are in electrical contact with the rail and the lifting block.

According to the embodiment of the present invention as set forth in claim 3, the downsizing of the whole press machine can be made smaller than in the case of forming a supporting guide of a wall structure having a large area such as surrounding the periphery of the pressing member. At the same time, it is possible to prevent skewing when the pressing member enters the press load, to secure a precise lifting and lowering movement with a small electric resistance, and to improve the press working accuracy.

In the press machine of the present invention, a single servomotor and a ball screw may be provided for a single member of the pressing member. However, as described in claim 4, a plurality of servomotors and ball screws may be provided for the pressing member. You may install it.

According to the embodiment of the present invention as defined in claim 4, the rotational driving force of the plurality of servomotors can be transmitted to the pressing member alone to realize a large press machine having a large press output of 100 tons or more, for example. Moreover, even in such a large press machine, the combination of the servo motor and the ball screw can achieve low noise, low vibration, energy saving, and high precision of press processing.

In particular, in a large-scale press machine using a plurality of servomotors and ball screws with respect to the pressing member, as described in claim 5, it is preferable to provide a plurality of roller guides at the periphery of the pressing member. desirable.

According to the embodiment of the present invention described in claim 5, even when the pressing member alone receives a large press load through a plurality of ball screws in the same shape as the embodiment of the present invention described in claim 2 It is possible to prevent skew and to ensure a smooth and smooth lifting movement always stable with low rolling resistance, so that a high press output and a high press can maintain a process density.

In addition, as the lifting and lowering guide means of the pressing member in the press machine of the present invention, as in the embodiment according to claim 6, the pillar-shaped member standing up on the base stand side is fixed to the pressing member side and fitted to the pillar-shaped member. It is also possible to use a slide moving guide mechanism made of a slide moving body which is held in alignment. In this case, as described in claim 7, it is preferable to provide a plurality of slide moving guide mechanisms in the periphery of the pressing member.

Even in the case of the embodiment of the present invention as recited in claims 6 and 7, the support guide of a wall structure having a large area such as surrounding the periphery of the pressing member is formed on the base. On the other hand, the press can secure the process density sufficiently high while miniaturizing and reducing the weight of the whole press machine.

Further, in the press machine of the present invention, as the rotational interlocking means between the servo motor and the drive shaft, as described in claim 8, a timing belt, a timing pulley, or a gear as described in claim 9, You may use any of the columns.

For large press machines, rotational interlocking means by gear trains are preferred. For small to medium press machines, timing belts and timing pulleys are used, resulting in very low noise and a superior effect in improving the working environment. Lose.

EMBODIMENT OF THE INVENTION Next, one Embodiment of the press machine which concerns on this invention of Claim 1 thru | or 5 and 9 is demonstrated based on drawing.

As shown in FIG. 1, the grounding stand 3 is provided with a knockout pin for detachably attaching the lower mold 1 thereon and detaching a workpiece from the lower mold 1 from the lower mold 1 on the lower side thereof. One hydraulic cylinder (2) is equipped, and on the left and right sides of the ground mount (3), the plate-like invitations (4) and (4) fixedly extended upward are provided, and the plate-shaped invitations (4) and ( 4) The gear case 5 is fixedly connected in the cross-linked state between the upper end portions of the plate, and the servo motors 6 and 6 are respectively positioned at the front and rear positions of the gear case 5 of the plate-based invitations 4 and 4, respectively. The output shafts 6a and 6a protrude downward and are fixed to each other.

On the other hand, between the left and right plate-shaped invitations (4), (4) ball screw that the pressing member (8) for attaching the upper mold (7) for attaching the workpiece to the lower end to replace the plurality of lifting mechanisms ( 9), (9) is installed through.

The pressing member 8 is made of metal and is cast in a hollow quadrangular structure having a gap portion 8a, as shown in FIG. 3, from the ball screws 9, 9 and the upper mold 7 An accommodating space for accommodating and attaching the upper hydraulic cylinder 10 having a knockout pin for detaching a workpiece as a molded product is formed.

Between the pressing member 8 and the left and right plate-like invitations 4 and 4, the roller guides 11 and 11 serving as the lifting guide means of the pressing member 8 are arranged in two rows each in two rows. The heat is installed.

As illustrated in FIGS. 3 to 5, each of the roller guides 11 includes a rail 12 fixed to the base 4 and an elevating block fixed to the pressing member 8. 13) and retainer 14 made of a resin or metal having good slide-movability, which is fixed to the lifting block 13 side, and a plurality of rollers 15 freely rotated on the retainer 14; The outer circumferential surface of the roller 15 is electrically contacted with the rail 12 and the elevating block 13 so as to smoothly and precisely guide the elevating motion of the pressing member 8 to low friction.

As shown in FIG. 1 and FIG. 6, the fixed block 16 fixed between the upper and lower ends of the above-described left and right plate-shaped invitations 4 and 4 is the downward direction of the servo motors 6 and 6. The longitudinal drive shafts 18 and 18, which are interlocked with each other via the reduction gear arrays 17 and 17 arranged in the gear case 5 on the output shafts 6a and 6a, are supported by the bearing groups 19 and ( Only the rotation is freely supported via 19, and ball screws 9 and 9 are interposed between the longitudinal drive shafts 18 and 18 and the pressing member 8 described above.

Each ball screw 9 is screwed to the ball screw shaft 20 and the ball screw shaft 20 which are fixedly connected to the lower end of the longitudinal drive shaft 18 so that rotation is possible, as shown in FIG. A ball screw nut 21 having a lower end fixed to the pressing member 8, a screw groove 22 formed in the ball screw shaft 20 and the ball screw nut 21, and these drive grooves ( The ball 25 is formed by a plurality of ball groups 25 interposed therebetween so as to be capable of electric movement, and grooves 24 formed in the inner circumferential side of the deflection portion 23 embedded in the ball screw nut 21. It is comprised by the deflection part 23 which circulates a ball by moving to the adjacent electric groove | channel 22 by one winding amount.

In the front and rear side positions of the left and right bases 4 and 4, an operation unit 26 capable of numerically inputting and setting data of press processing conditions such as lifting stroke and lifting operation speed of the pressing member 8 is provided. At the same time, the upper rear portions of the left and right bases (4) and (4) rotate the servomotors (6) and (6) on the basis of the press processing condition data set and input to the operation unit (26). A steel panel 27 for controlling the NC controller is provided.

In addition, a hydraulic unit 28 for controlling the supply of hydraulic pressure to the knockout hydraulic cylinders 2 and 10 is fixed to the rear portion of the ground mount 3.

Next, the press operation by the press machine configured as described above will be briefly described.

First, data on press processing conditions such as lifting stroke and lifting operation speed of the pressing member 8 are numerically inputted to the operation unit 26 for setting.

When driving of the servomotors 6 and 6 is started in this state, the servomotors 6 and 6 are controlled by the NC control unit power board 27 based on the set input data to control the rotation speed and amount of rotation. The rotation is transmitted to the longitudinal drive shafts 18 and 18 via the reduction gear trains 17 and 17 so that the longitudinal drive shafts 18 and 18 are servomotors 6 and 6. The rotation is controlled in synchronization with.

With the rotation of the longitudinal drive shafts 18 and 18, the ball screw shafts 20 and 20 of the ball screw 9 and 9 are integrally rotated and screwed thereto. The threaded nuts 21 and 21 are lifted and lowered in a state of low friction by the electric circulation movement of the ball group 25 interposed between the electric grooves 22 between the screw nuts 21 and 21. In accordance with the elevating, the pressing member 8 and the upper mold 7 are driven up and down integrally in a set stroke, and the predetermined work is performed by pressing the workpiece provided in the lower mold 1.

In this way, the drive mechanism of the pressing member 8 is composed of a combination of the servo motors 6, 6 and the ball screws 9, 9, which are rotationally controllable through the NC control device steel panel 27, and the flywheel. Since the press machine is not used at all, the miniaturization and light weight of the whole press machine can be achieved, and since the servomotors 6 and 6 are not subjected to a large load such as when the flywheel is rotated, motor noise and vibration are hardly generated. In addition, the work environment can be greatly improved.

In addition, since there is no wasted power consumption during standby or rest of press processing, the operating cost can be drastically reduced by reducing power consumption.

In addition, the combination of the ball screws (9) and (9) with low friction and good mechanical efficiency and the servomotors (6) and (6) with automatic tracking performance enables the output of hul power throughout the entire lifting stroke. Not only can be applied to a wide range of press processing with different required pressures, but also it is easy to control the lifting motion speed, position, or lifting stroke of the pressing member 8 flexibly and precisely according to the processed product, Significant improvement in machining accuracy can be realized.

In particular, as in the embodiment described above, the rotational driving force of the two servomotors 6 and 6 is transmitted to the single member of the pressing member 8 intensively, for example, about 100 to 200 tons. A large press machine with a large pressurization output of

In addition, the four roller guides 11 are used as the elevating guide means for the pressing member 8, compared with the case of using the supporting structure of the wall structure having a large area, such as surrounding the periphery of the pressing member 8. While minimizing the overall size of the press machine, it is possible to prevent skewing when the press member 8 enters the press load, and to ensure a smooth and smooth lifting motion with a small electric resistance at all times. It can be planned.

Next, another embodiment of the press machine which concerns on this invention of Claim 1, 6, and 8 is demonstrated based on drawing.

In this embodiment, as shown in FIGS. 8 to 11, the upper foundation for rotatably supporting the ground mount 3 and the single longitudinal drive shaft 18 as the lifting guide means of the pressing member 8. Three columnar members 30 having a circular cross section, which are installed between the large blocks 29, and three slide movable bodies fixed to the pressing member 8 and fitted to and held by the columnar members 30 ( 31. The ball screw nut 21 fixed to the lower end of the longitudinal drive shaft 18 as an elevating mechanism of the pressing member 8 while being used as the inner mechanism 32 during the slide made of the slide 31, and the lower end thereof. A single ball screw 9 having a ball screw shaft 20 fixed to the upper boss portion 8a of the pressing member 8 and screwed to the ball screw nut 21 and a plurality of ball groups 25. And the servomotor 6 fixed to the rear portion of the upper base block 29 and the above-mentioned longitudinal drive. Timing pulleys 33, 34 fixed to the output shaft 6a and the longitudinal drive shaft 18 of the servomotor 6 as rotation interlocking means with the shaft 18, and these pulleys 33, 34 The upper and lower hydraulic cylinders for knockout are not used again, and the other parts are the same as those of the above embodiment. Description is omitted.

Also in the press machine shown in Figs. 8 to 11, the drive mechanism of the pressing member 8 has a friction with the servomotor 6 having an auto-following performance capable of rotation control via the steel panel 27 for NC control apparatus. It is composed of a ball screw 9 with a small number and good mechanical efficiency. Therefore, compared to using a flywheel, the press machine can be reduced in size, weight, motor noise, and vibration. In addition to drastically reducing the operating costs due to the reduction, the output of the hull power is possible over the entire lifting stroke, and it can be applied to a wide range of press processing with a large and low required pressure.

In addition, the lifting operation speed, position, or lifting stroke of the pressing member 8 can be flexibly and precisely controlled according to the processed product, and a significant improvement in the predetermined processing accuracy can be realized.

As the lifting and lowering guide means for the pressing member 8, the inner member 32 is pressed while using the slide member made of the columnar member 30 and the slide movable body 31 fitted to and held by the columnar member 30. Compared to the case of using a wall structure supporting guide having a large area such as surrounding the periphery of the member 8, it is possible to reduce the size of the press machine 8 while preventing the skew at the time of entering the press load of the pressing member 8 It is possible to further improve the press working accuracy by ensuring a smooth and stable lifting motion in the rolling resistance.

As described above, the present invention is a pressure member that presses a workpiece and is configured to be liftable and driveable through a ball screw having low friction and good mechanical efficiency, thereby achieving compact weight, low noise, and low vibration. At the same time, it is possible to reduce the operating cost due to the low power consumption, and furthermore, it is possible to realize the operation control and the data of the processing conditions so that the press can realize a significant improvement in the process density.

Claims (9)

A press machine comprising a motor supported on a base, an elevating mechanism for elevating by a rotational drive of the motor, and a pressing member fixedly connected to the lower end of the elevating mechanism for pressing a workpiece, wherein the motor is controlled by a control mechanism. The lifting mechanism comprises a servomotor capable of rotation control and the elevating mechanism includes a ball screw shaft, a ball screw nut screwed to the ball screw shaft, and an electric movement in the electric groove formed in the ball screw shaft and the ball screw nut. It consists of a ball screw provided with a ball group that is possibly interposed, wherein one of the ball screw shaft and the ball screw nut of the elevating mechanism is connected to the drive shaft side that is rotationally linked to the servo motor, and the other to the pressing member side. Press machine characterized in that the fixed connection. The method of claim 1, A press machine as claimed in claim 1, wherein said control mechanism comprises an NC controller capable of numerically setting and inputting data of press working conditions. The method of claim 1, As the elevating guide means of the pressing member, a roller guide portion comprising a rail fixed to the base side, an elevating block fixed to the pressing member side, and an outer circumferential surface of the rail and rollers in electrical contact with the elevating block. Press machine characterized in that a plurality is installed. The method of claim 1,  And a plurality of the above-described servo motors and ball screws for a single member of the pressing member. The method of claim 4, wherein And a plurality of roller guides are provided at the periphery of the pressing member alone in addition to the plurality of servomotors and ball screws provided for the single pressing member. The method of claim 1, An inner mechanism is provided as the lifting guide means for the pressing member, wherein the inner member is provided with a columnar member standing up on the base side and a slide movable body fixed to the columnar member and fitted to the columnar member. Press machine. The method of claim 6,  And a plurality of internal mechanisms are provided at the periphery of the pressing member unit during the slide. The method of claim 1, And said servomotor and drive shaft are rotationally interlocked via a timing belt and a timing pulley. The method of claim 4, wherein And said plurality of servomotors and their corresponding drive shafts are rotationally linked via a gear train.