JPH10113732A - Pressing method and electrically-driven press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To work a fine shape into a stock to be worked with a high precision and discontinuous pitch. SOLUTION: A work holder 59 is operated in only the section wherein an upper die 57 in the working cycle equivalent to the one time vertical movement of the upper die 47 separates a given interval or above from a lower die 58, and the stock 49 to be worked is transferred with a prescribed pitch to position in the working zone of the device 44. The upper die 47 is vertically moved by controlling the transfer speed so as to decelerate in the section wherein it descends from the prescribed position to the lower dead center in the working cycle, and the stock 49 to be worked is worked with the working tool 31 of the upper die 47 at the time point of the upper die 47 reaching the lower dead center. The air is sucked from the working zone toward the lower part of the stock 49 to be worked in the section wherein the upper die 47 approaches within a given interval to the lower die 48, whereby scraps or the like are sucked and removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press working method for continuously punching a predetermined pattern of hole shapes in a work material made of a thin plate such as a metal or a synthetic resin, and an electric press used therefor. It concerns machines.

[0002]

2. Description of the Related Art In general, when a large number of fine holes are continuously formed in a thin plate material such as a metal or a synthetic resin, a punching process is adopted. This punching process is performed by an electric press as shown in FIG. It is performed using a machine. In this electric press machine, a workpiece 4 composed of a long thin plate wound with a coil is fed out by a supply device 7 between a pair of upper and lower dies 2 and 3 of an upper and lower mold device 1 mounted thereon. And when the upper mold 2 descends,
The punch (not shown) attached to the upper die 2 is a workpiece 4
The hole shape corresponding to the cutting blade provided at the tip of the punch is transcribed and formed in the workpiece 4 by penetrating and inserting into the die opening (not shown) of the lower mold 3.

[0003] The conventional electric press machine shown in FIG. 6 includes a motor 11 as a driving source installed on the upper surface of a steel main body frame 10.
The rotation of the flywheel 13 is transmitted to the flywheel 13 via the timing belt 12, and the rotation of the flywheel 13 is transmitted to the crank 17 at a timing at which the electromagnetic clutch 14 disposed on the side of the flywheel 13 is driven. A connecting member 18 is connected to a crank 17 rotatably supported by the cam receiving member 15 via a bearing 19.
An upper die 2 is attached to the lower surface of the connecting member 18, and a ram 20 slidably held in a vertical direction by a ram guide 21 is connected via a bearing 22.
Therefore, when the crank 17 is connected to the flywheel 13 by the operation of the electromagnetic clutch 14 controlled by the control unit 16, the connecting member 18 operates vertically while being rocked by the crank 17, and is connected to the connecting member 18. The ram 20 is guided by a ram guide 21 and vertically moved up and down linearly. The upper die 2 attached to the ram 20 comes into contact with and separates from the lower die 3 attached to the upper surface of the bolster 23.

On the other hand, a plurality of drive gears 8 are intermittently driven to rotate by a flywheel tuning drive cam 24 which operates in synchronization with the rotation of the flywheel 13 in a supply device 7 for the workpiece 4. The supply roll 9 to which the rotation of the gear 8 is transmitted is intermittently rotated by a certain amount. Thereby, the workpiece 4 is fed out by a fixed length while the flywheel 13 makes one rotation, and is fed. When the workpiece 4 is stopped between the upper mold 2 and the lower mold 3, the workpiece 4 is cut by the cutting edge of the punch. Processing such as punching is performed on the set hole shape.

FIG. 7 is a longitudinal sectional view showing the mold apparatus 1 in the electric press machine of FIG. 6 in detail. In the figure, an upper mold 2 of the mold apparatus 1 includes a base 27 fixed to a ram 20, a punch plate 28 fixed to the base 27, a stripper 29 held by a hanger 30, a punching tool, And a punch 31 as a main component. The punch 3 has a punch 3
1 and the stripper guide pin 32 are attached in a hanging state. The stripper 29 is slidably inserted and inserted into the distal end of the punch 31 and the stripper guide pin 32, respectively, and is arranged so as to be vertically movable while being guided by the stripper guide pin 32. Spring 33 interposed between
The upper die 2 is constantly pressed downward, and is pressed against the hanger 30 when the upper die 2 is separated from the lower die 3 during non-machining. At the time of non-machining, the cutting blade 31a at the tip of the punch 31 is housed inside the stripper 29.

On the other hand, the lower mold 3 of the mold apparatus 1 includes a base 34 fixed to the bolster 23 and a die 37 fixed to the upper surface of the base 34. The die 34 has a die opening 38 for receiving the cutting edge 31 a of the punch 31.
And a guide bush 39 for receiving the stripper guide pin 32.
It is formed larger than 1a by the clearance.
The stripper 29 guides the leading end of the punch 31, and the stripper guide pin 32 has a function of guiding the stripper 29 to move up and down while preventing horizontal swing. Also,
The guide post 40 erected on the base 34 prevents the upper mold 2 from rolling when it is moved up and down.

[0007] The operation of the mold apparatus 1 will be briefly described. When the upper die 2 moves down, first, the tip of the stripper guide pin 32 is inserted into the guide bush 39, and subsequently, the stripper 29 presses the workpiece 4 against the upper surface of the die 37. Next, the cutting edge 31a of the punch 31 cuts into the workpiece 4 and punches the workpiece 4 therethrough. Thus, the center deviation between the cutting edge 31a of the punch 31 and the die opening 38 during the punching process is minimized.

[0008]

However, in the press working method using the above-described electric press machine, generally, the workpiece 4 fed out by the supply roll 9 is used for the die apparatus 1.
Punching is performed continuously, but due to insufficient rigidity of the entire electric press machine including the steel main body frame 10, microvibration caused by rotation of the motor 11 and microvibration generated during punching, the punch 31 is pressed. Of the transfer shape from the cutting edge 31a to the workpiece 4 and a pitch shift between the transfer shapes occur, and the plastic deformation of the workpiece 4 after punching is large. It was difficult to improve the accuracy. On the other hand, the lack of rigidity and the occurrence of micro-vibration cause the upper die 2 and the lower die 3 of the mold apparatus 1 to be broken or broken, thereby shortening the tool life.
In particular, as clearly shown in FIG. 6, since the distance L from the driving source to the point of application of force in the electric press machine is long, the operation of the machining head portion including the crank 17, the connecting member 18, the ram 20 and the upper mold 2 is performed. Is unstable and vibration is liable to occur, which greatly affects the accuracy of the transfer shape and the life of the upper and lower dies 2 and 3, and it is very difficult to correct on the order of microns. The accuracy is limited.

In addition, the electric press machine and the mold apparatus 1 used therefor have a comprehensive view of the working capacity and precision of the electric press machine or the tool arrangement and precision of the mold apparatus 1 according to the workpiece 4 to be punched. Judgment is made, and the one that adapts to it is selected. However, it is extremely difficult to predict the degree of occurrence of accumulation errors due to plastic deformation during operation, and there is no means for correcting the errors. Thus, ignoring the dynamic accuracy, the electric press machine is selected based on only the static accuracy, and the mold device 1 is selected by considering only the engagement accuracy of the upper and lower dies 2, 3. Therefore, the feed amount of the workpiece 4 can only be fixedly selected. That is, the feed amount of the workpiece 4 in the continuous processing cannot be changed, and the punching shape is limited to a fixed shape.

An object of the present invention is to provide a press working method and an electric press machine capable of processing a fine shape on a material to be processed with high precision at a discontinuous pitch.

[0011]

In order to achieve the above object, the present invention relates to a press working method for performing a process such as punching on a thin plate-like material to be processed by an upper die and a lower die of a mold apparatus. The workpiece having a predetermined shape is fixed to a work holder that moves while being guided by the lower mold, and the upper mold in the machining cycle corresponding to one vertical movement of the upper mold is fixed to the work holder. By operating only a section that is separated from the mold by a predetermined distance or more, the workpiece is transferred at a predetermined pitch and positioned in a processing area of the mold apparatus, and the upper die is moved to a predetermined position in the processing cycle. The moving speed is controlled so as to decelerate in a section descending from bottom dead center to vertical movement, and at the time when the upper die reaches the bottom dead center, the workpiece is processed with the upper die processing tool, Processing rhinoceros In a section where the upper die of the metal mold is close to the lower die within a predetermined interval, air is drawn from the processing area so as to generate a flow of air downward of the workpiece. .

In the above-mentioned press working method, since the upper die is decelerated in a section from a predetermined position to the bottom dead center,
Impact resistance during processing is reduced. Therefore, it is possible to attach the workpiece to the work holder that is guided and moved by the lower die and transport the workpiece at a predetermined pitch. By transferring the work material inside the mold apparatus in this way, it is possible to perform fine positioning of the work material and automatic change of the transfer pitch, and furthermore, the same work shape is applied to the work material. Can be processed with high repetition accuracy. In addition, before and after, including during processing, scrap and dust generated in the processing area at the time of processing are removed by suction of air, and the processing area is constantly cleaned, so that the material to be processed is transferred inside the mold apparatus. Nevertheless, the material to be processed can be prevented from being damaged by scraps and dust, and stable processing accuracy can be maintained.

Further, the electric press machine of the present invention comprises a main body frame made of a material capable of rapidly attenuating vibration, an upper die and a lower die, and a metal die mounted on a central portion of the main body frame. A mold device, a pressurizing mechanism for vertically moving the upper mold, and a material transfer device for intermittently transferring a fixed workpiece to be processed having a predetermined shape at a predetermined pitch while being guided by the lower mold; and A scrap suction device for performing vacuum suction to generate a flow of air downward from the processing area in the die apparatus to the workpiece, and driving the press mechanism, the material transfer device, and the scrap suction device with the upper die A control unit for controlling each machining cycle corresponding to one vertical movement of the upper die, wherein the control unit controls the pressing mechanism to move the upper die up and down at a predetermined speed in the machining cycle. Control to decelerate in the section descending from the bottom die to the bottom dead center, and control the material transfer device to operate only the section in which the upper die in the processing cycle is separated from the lower die by a certain distance or more, The suction device is controlled to operate only in a section in which the upper die in the processing cycle is close to the lower die within a certain interval in the processing cycle.

In the above-described electric press machine, since the main body frame is made of a material such as a natural stone material which can rapidly attenuate vibrations, the main body frame generates micro vibrations generated during machining and micro vibrations generated from a driving source. Since the collision resistance during processing is reduced by reducing the speed of the upper mold during processing, the material transfer device for transferring the material to be processed inside the mold device can be easily provided. Can be. Further, the processing area can always be cleaned by the scrap suction device. Therefore, this electric press machine can easily embody the press working method of the present invention described above, can perform fine positioning of the work material and automatically change the transfer pitch, and can repeat the same work shape on the work material with high repetition accuracy. Processing can be performed, and stable processing accuracy can be maintained. As a result, it is possible to achieve a finer processing shape and a higher precision of the processing target material.

In the above invention, the main body frame has a gate-shaped structure, and the pressurizing mechanism includes a servomotor of a pressurizing drive source installed on the upper surface of the mainframe, and rotation of the servomotor. A rotary cam transmitted to the rotary cam, a sensor disposed at the axis of the rotary cam and detecting its rotation,
A cam holder fitted so as to swing vertically with respect to the rotating cam, a connecting mechanism for converting the swinging motion of the cam holder into a linear motion, and an upper end connected to the connecting mechanism. And a ram having an upper die fixed to a lower end portion thereof, and the cam holder and the connecting mechanism are provided in a spherical engagement recess at a lower portion of the cam holder. A plurality of guide posts, which are slidably and rotatably engaged and connected to each other at an upper end of the engagement protrusion and are vertically provided from an upper surface of the ram, are provided in a guide hole of the main body frame in a stroke bearing. Preferably, the controller is configured to slidably insert the servomotor, and the control unit performs feedback control of the servomotor based on rotation detection data of the rotary cam input from the sensor.

Accordingly, the main body frame has a portal structure, so that the rigidity is improved and the generation of vibration can be suppressed. Further, since the rotation of the servomotor is directly transmitted to the rotary cam, the point of action and the point of force of the drive are set on the axis of the rotary cam, so that loss of kinetic energy and generation of vibration can be suppressed. Further, when the swinging motion of the cam holder is converted into a linear motion and transmitted to the coupling mechanism, the cam holder and the coupling mechanism are slidably and rotatably engaged with the engagement projections in the spherical engagement recesses. As a result, bending and torsion caused by centrifugal force can be absorbed at the connecting portion to adjust the center, thereby further suppressing the occurrence of vibration. In addition, since the guide post is slidably inserted into the guide hole of the main body frame via a stroke bearing to guide the ascending and descending of the ram, the stress generated when converting from rotary motion to linear motion is reduced. Can improve the dynamic accuracy. Furthermore, since the sensor is disposed at the axis of the rotating cam, the rotation speed and the actual position of the rotating cam can be accurately detected, and the control unit performs processing based on the accurate rotation detection data of the sensor,
The material transfer device and the scrap suction device can be controlled with high precision.

In the electric press machine according to the present invention, the material transfer device includes a transport drive unit and a transport guide unit which are disposed on both sides of a processing area on the upper surface of the lower die, and the transport drive unit and the transport guide. A transfer plate that is movably held over each of the guide rails of the unit, and is provided so as to be movable while being guided by the lower mold while fixing the work material, and is provided at a connection portion at a central portion of the transfer plate. A transfer drive unit, the transfer drive unit includes a base formed of a material capable of rapidly attenuating vibration, the guide rail positioned and fixed to the base, and a transfer drive source. A servomotor, and a ball screw for moving the transfer plate by rotation of the servomotor, wherein the transfer guide portion is made of a material capable of rapidly damping vibration. And a base made of
It is preferable that the guide rail is positioned and fixed to the base and the rotation of the servo motor is controlled by a control unit.

Accordingly, the transport drive section and the transport guide section each have a base made of a material capable of rapidly attenuating the vibration, so that the vibration generated during processing and the propagation of the vibration of the drive source can be reduced. In addition, since the transport plate is movably held across the guide rails of the transport drive unit and the transport guide unit, stress applied to the guide rail during transport can be reduced, and yawing can be prevented. Therefore, this material transfer device can transfer the material to be processed at a fine pitch with high precision.

In the electric press machine of the present invention, the scrap suction device is fixed to the lower end of the main body frame by communicating with a scrap discharge passage provided to communicate with the lower end of the main body frame from the processing area of the lower die. A scrap box, and suction force generating means for applying a suction force of air to the processing area through the scrap box and the scrap discharge passage, wherein the suction force generating means is operatively controlled by a control unit. Is preferred.

Thus, scrap and dust generated by the processing can be forcibly and quickly sucked and stored in the scrap box. In addition, the scrap suction device is operated after the positioning of the workpiece, so that the air flow does not adversely affect the positioning of the workpiece, such as generating a small error, and the workpiece after positioning is instantaneously removed. In addition, since the lower die is attracted to, for example, a die and stopped, there is an advantage that the processing speed and the processing accuracy are improved.

In the electric press machine according to the present invention, the die apparatus comprises an upper die on which a punch is mounted as a working tool, and a die opening of the die which is opposed to a cutting blade of the punch so that the die can be inserted into the die. A plurality of suction nozzle holes communicating with the scrap discharge passage of the main body frame from around the die opening are formed on the die, and a work holder movably held by the lower die is provided. ,
It is preferable that the material transfer device is provided with a swing connection portion that swingably connects to a connection portion of the transport plate.

Thus, the processing area can be locally cleaned by vacuum suction through the plurality of suction nozzle holes. In addition, since the work holder is connected to the transport plate of the material transfer device via the swing connection portion, the minute displacement that occurs when the mold device is attached and the twist that occurs when the above-described connection is performed are described by the swing connection portion. Can be absorbed.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration diagram of a press working system according to an embodiment that embodies the press working method of the present invention. Next, the schematic configuration and operation of this press working system will be described. In addition,
In this press working system, processing such as bending and drawing can be performed in addition to punching, but for convenience, this embodiment will describe punching. The control unit 50 controls the pressurizing mechanism unit 41, the material transfer device 53, and the scrap suction device 54 as shown in FIG. 2, and includes a personal computer terminal 51, a controller 52 including a sequence board, a servo controller, a CPU, and the like. It consists of. The main body frame 62 of the electric press machine is
It is made of a natural stone material having a high vibration damping effect, and has a function of rapidly attenuating micro-vibration generated by the vertical movement of the pressing mechanism 41 and the ram 43.

The pressing mechanism 41 comprises a ram 43 and a ram driving unit 42. The ram driving unit 42, which is controlled by the control unit 50, controls the moving speed of the ram 43 in one machining cycle as shown in FIG. To operate. That is, in one machining cycle, the ram 43 is rapidly lowered from the top dead center to the predetermined position X, decelerated from the predetermined position X to the bottom dead center, and rapidly raised from the bottom dead center to the top dead center. So that the moving speed is controlled. Accordingly, the upper die 47 of the die device 44 fixed to the ram is reduced in moving speed in a period from the predetermined proximity position X to the lower dead center with respect to the lower die 48 in one processing cycle, so that during the processing, The collision resistance and vibration applied to the workpiece 49 are remarkably reduced. The ram drive unit 42 is composed of a servo motor as a rotary drive source, a rotary cam, and a coupling mechanism that converts the rotary motion of the rotary cam into a linear motion with high efficiency and low vibration. Will be described later.

The material transfer device 53 is controlled by the control unit 50 to control the upper die 47 and the lower die 48 of the mold device 44.
Each time the machining is completed, the work holder 59 movably disposed between the work holder 59 and the work holder 59 is moved in the direction of the arrow in FIG. The material 49 is transferred to the next processing position, and is controlled so as to be positioned and stopped. As shown in FIG. 2, the operation of the material transfer device 53 is performed during a period in which the upper die 47 in one processing cycle rises from the bottom dead center to the predetermined position X and then descends to the predetermined position X.
That is, the process is performed during a period in which the upper mold 47 is separated from the lower mold 48 by a certain distance or more.

The material transfer device 53 includes a base 57 made of natural stone having a high vibration damping effect,
Guide rail 5 positioned and fixed on high precision 7
8 and the guide rail 58 while holding the workpiece 49.
Holder 59 that moves while being accurately guided along the movement path along the axis, a ball screw 60 that moves and positions this work holder 59 at a fine pitch, and a ball screw 60 that rotates intermittently with high resolution under the control of the controller 52. The transport servomotor 61 is a transport drive source that controls the rotation of the transport motor 60.

As described above, the moving speed of the ram 47 is reduced at the moment of the punching of the workpiece 49, so that the collision resistance and vibration applied to the workpiece 49 during the processing are significantly reduced. The main body frame 62 attenuates micro vibrations generated during processing or from a drive source, so that the material transfer device 53 can be electrically driven by the press machine and the mold device 44.
It is possible to mount it inside. With this material transfer device 53, the workpiece 49 can be transported at a fine pitch and accurately positioned, and the feed amount of the workpiece 49 can be automatically changed, thereby positioning the workpiece 49 with high correction accuracy. Has become possible. It should be noted that the reduction of the micro-vibration can reduce the loss and breakage of the mold device 44, and the life of the mold device 44 is improved.

The scrap suction device 54 includes a mold device 44.
Every time the punching of the workpiece 49 by
Dust and scraps generated around the upper and lower dies 47 and 48 and scraps remaining in the lower dies 48 are forcibly removed by suction to locally clean required portions. This prevents deterioration of the positioning accuracy of the workpiece 49 due to scrap or the like, prevents damage or deterioration of the mold device 44 due to scrap or the like, and further improves the life of the mold device 44. Also, since the material transfer device 53 is mounted on the electric press machine and the material 49 to be processed is conveyed inside the mold device 44, the repetition accuracy during operation is improved, and the same punching shape is used for the material 49 to be processed. Can be continuously formed with high precision.

Next, the detailed configuration and operation of each part of the press working system will be described.

FIG. 3 is a cutaway side view showing an embodiment of an electric press machine used in the press working system shown in FIG. 1. In FIG. 3, the mold device 44 is not shown for convenience. I have. In FIG.
Is composed of a bolster 64 made of a natural stone material, and a holding frame 63 formed on the bolster 64 and fixed to the bolster 64 by forming an inverted U-shaped cross section, that is, a gate shape by the natural stone material. The main body frame 62 is supported by a plurality of anti-vibration mounts 67 containing an elastic body. The main body frame 62 has the following features.

That is, since the holding frame portion 63 has a high rigidity due to the gate shape, the holding frame portion 63 and the material transfer device 53 are stably held for long-term operation. The holding frame 63 and the bolster 64 are both made of a natural stone material, and have a high vibration damping effect and an effect of reducing deterioration over time. As a result, the main body frame 62 is
1. The material transfer device 53 and the mold device 44 can be held with high dynamic accuracy at the micrometer level. According to the measurement results, the main body frame 6 composed of a natural stone material in a gate shape is used.
2 reduces propagation vibration to 1/4 to 1/5 as compared with the steel body frame 10 shown in FIG. Reduce to 20.

A ram drive unit 42 of the pressing mechanism 41 is positioned and attached above the center of the holding frame 63. Next, the ram drive unit 42 will be described. At the center of the top surface of the holding frame portion 63, a pair of pivot members 69 are disposed at predetermined intervals, and the rotating cam 68 rotatably supports both end portions of the pair of pivot members 69 via the bearings 70. Have been. The rotating cam 68 is provided with a thrust bearing 7 provided on the outer surface of each shaft support member 69.
By being locked by the lock nut 72 with 1 interposed, the shaft 1 is held while preventing axial runout. Also,
The rotary cam 68 has an eccentric bulging portion 6 protruding from a central portion thereof in one direction by an amount equivalent to a half of a stroke amount of the ram 43.
8a are integrally formed.

The pressurizing servomotor 73, which is a rotary drive source of the rotary cam 68, is installed on the top surface of the holding frame 63 with a vibration isolating rubber 74 interposed on the lower surface. The coupling mechanism between the pressurizing servomotor 73 and the rotating cam 68
A drive-side pulley 77 fixed to the motor shaft of the servomotor 73, a passive-side pulley 78 fixed to one end (right end in the drawing) of the rotating cam 68, and a timing belt 79 containing a wire connecting the pulleys 77 and 78. It is composed of The driven pulley 78 is inserted into one end of the rotary cam 68 in a state of being lightly press-fitted, and then the retaining plate 8 is inserted.
0 is attached to the rotating cam 68.

At the other end (left end in the figure) of the rotary cam 68, a rotary encoder 81 for detecting the rotational speed and position of the rotary cam 68 is provided. The rotary encoder 81 is arranged so that its axis coincides with the extension of the axis of the rotary cam 68, and is attached to a bracket 82 fixed to one of the shaft support members 69 in a cantilever manner. It is connected to the rotating cam 68 via a joint 83. Thus, the rotary encoder 81
Is arranged so that its axis coincides with the axis of the rotary cam 68, so that the rotational speed and the position of the rotary cam 68 can be accurately measured. Output. The control unit 50 performs feedback control of the rotation of the pressurizing servomotor 73 based on the measurement data input from the rotary encoder 81.

The ram drive section 42 in the pressurizing mechanism section 41 shown in FIG. 1 converts the rotational force of the rotary cam 68 into a linear motion in the vertical direction with high precision and without loss, and transmits the linear motion to the ram 43. The connecting mechanism 85 is provided. Next, the connecting mechanism 85 will be described. A cam holder 84 is fitted in a central portion of the rotary cam 68 where the eccentric bulging portion 68a is formed so as to cover the periphery with a bearing 87 interposed therebetween. Are formed. The engaging recess 88 is formed into an accurate spherical surface by hardening and hardening and then polishing.

Further, the engaging recess 8 of the cam holder 84
An engaging projection 90 provided on the upper end of a shut height adjusting member 89 having a shaft shape as a whole is slidably and rotatably fitted to the shaft 8 and is held by the retaining member 91 in the fitted state. ing. Thus, the rotating cam 68 is pivotally connected to the shut height adjusting member 89 via the cam holder 84. In this shut height adjusting member 89, a plurality of shut height rotation adjusting holes 92 are provided along the peripheral surface in the vicinity of the engaging convex portion 90, and a shut height adjusting screw 92 is provided in the lower half. A portion 93 is formed.

Further, the shut height adjusting member 89 has a screw portion 93 which is screwed into a female thread portion of the first connecting shaft portion 94, and which has a plurality of rotation locking holes 98 in the circumferential direction. 97 First
Are connected to the first connection shaft portion 94 by fastening in a direction in which they contact the connection shaft portion 94. First connecting shaft 94
Are pivotally connected to a second connection shaft 99 fixed to the ram 43. That is, both connecting shaft portions 94 and 99
Is combined with the convex portion of the first connecting shaft portion 94 and the concave portion of the second connecting shaft portion 99 in a mutually inconsistent manner, and the support shaft 100 is inserted through the combined portion, so that It is rotatably connected to a support shaft as a fulcrum. Therefore, the rotational force of the rotary cam 68 is converted into the vertical swinging motion of the cam holder 84, the shut height adjusting member 89, and the first connecting shaft portion 94, and then converted into the vertical linear motion, thereby This is transmitted to the second connection shaft 99.

On the other hand, the ram 43 of the pressing mechanism 41 shown in FIG.
Is formed of, for example, high-tensile aluminum, and the ram 43 has a plurality of guide posts 10 on its upper surface.
2 are set up vertically, and each guide post 1
Numerals 02 are provided corresponding to the plurality of guide holes 103 formed through the holding frame 63. Each guide post 102 is slidably inserted into a corresponding guide hole 103 via a stroke bearing 104 so as to be positioned, and is guided while sliding on the stroke bearing 104 to enter and exit the guide hole 103. Thus, the ram 43 uniformly presses the entire upper die mounting surface 43a with linear kinetic energy obtained by converting the rotational motion of the rotary cam 68 into linear motion of the second connecting shaft portion 99. In addition to acting, the stress generated when converting the rotary motion into the linear motion can be reduced, and the dynamic accuracy is improved.

The pressurizing mechanism 41 has a short distance L from the pressurizing drive source by the pressurizing servomotor 73 to the point of action of the force, and has a point of action and a point of force on the axis of the rotating cam 68. Is provided, the transmission loss of the driving energy can be reduced, and the generation of vibration in the coupling mechanism portion 85 that converts the rotation of the rotary cam 68 into a linear motion and transmits the linear motion to the ram 43 can be suppressed. Further, the rotating cam 68 and the connecting mechanism 85 are connected by the engagement between the spherical engaging concave portion 88 and the engaging convex portion 90, and the cam holder 8 which is a part of the connecting mechanism 85 is connected.
4. Since the shut height adjusting member 89 and the first connecting shaft 94 are oscillated, bending and torsion caused by centrifugal force can be absorbed and the center can be adjusted, thereby suppressing generation of vibration. Thereby, the pressing mechanism 41 can be operated stably.

In the embodiment of the present invention, the guide hole 103 is accurately formed at a high accuracy square angle of 10 μm or less with respect to the lower end face 63 a of the holding frame 63. Was accurately erected at a high accuracy squareness with an inclination error of 10 μm or less with respect to the upper mold mounting surface 43 a of the ram 43. Further, the upper surface 64a of the bolster 64 on which the material transfer device 53 is installed was ground and polished to a flatness of 5 μm or less. As a result, it was possible to secure dynamic accuracy in which the maximum parallelism error between the upper die mounting surface 43a and the upper surface 64a of the bolster 64 was 15 μm or less.

Next, referring to FIG. 3, a configuration excluding the work holder 59 in the material transfer device 53 of FIG. 1 will be described. Holding frame 6 on the upper surface of bolster 64
3 are located near both inner wall surfaces, respectively.
7 and a transport guide unit 108 are provided. The transport drive unit 107 includes a base 57a made of a natural stone material fixed to the upper surface 64a of the bolster 64 by abutting one inner wall surface of the holding frame unit 63, and an inverted L-shaped attachment portion at a corner of the base 57a. A guide rail 58a which is fixed in an accurate positioning state by contact, a ball screw 60 arranged at an intermediate portion of the guide rail 58a by setting straightness and inclination accurately, and a rotation drive source of the ball screw 60 And the transport servomotor 61. The transport guide section 108 has a base 57b made of a natural stone material fixed to the upper surface 64a of the bolster 64 in contact with the other inner wall surface of the holding frame section 63, and an inverted L-shaped mounting portion at a corner of the base 57b. And a guide rail 58b fixed in an accurate positioning state.

A transport plate 109 is movably mounted on the opposite guide rails 58a and 58b, and a connecting portion 110 for the work holder 59 shown in FIG. Have been. The transfer plate 109 is provided with the transfer servomotor 6.
1 rotates the ball screw 60 along the guide rails 58a, 58b on both sides at a fine pitch. The control unit 50 controls the rotation of the pressurizing servomotor 73 based on the measurement data from the rotary encoder 81 that measures the rotational speed and position of the rotary cam 68, and also controls the rotational speed and position of the transport servomotor 61, The moving speed and position of the transport plate 109 are controlled in conjunction with the ram 43 as shown in FIG. Thereby, the material transfer device 5
Reference numeral 3 denotes a control unit which performs high-precision conveyance in which the error is on the order of microns and controls a conveyance error generated by repetition of conveyance.
It is automatically corrected by 0.

In the material transfer device 53, the base 57
Since a and 57b are made of a natural stone material, vibration during processing and vibration due to driving of the servomotor 61 for conveyance are reduced by 1/4 compared to the case where a steel base is used.
It can be reduced to 1/5 and the time-dependent deterioration of accuracy due to residual stress can be reduced to 1/10 to 1/20. Also, the transport plate 109
The guide rails 58 are formed by moving over the guide rails 58a and 58b of the transport drive unit 107 and the transport guide unit 108 disposed opposite to each other.
The stress applied to the a and 58b can be reduced, and the occurrence of yawing during transport can be suppressed. Furthermore, the transport servo motor 61
Is controlled by the control unit 50, so that the transport plate 109
, The workpiece 49 to be processed, that is, the workpiece 49 can be transported at a fine pitch in units of microns with high precision, and the automatic change and correction of the feed amount can be arbitrarily controlled.

In the embodiment of the present invention, the ball screw 6
0 and the inclination and linearity of the two guide rails 58a, 58b are adjusted while measuring and inspecting with a laser length measuring machine. Was set as follows.

Referring to FIG. 3, the scrap suction device 54 shown in FIG. 1 will be described. The scrap suction device 54 is connected to the scrap discharge passage 111 of the bolster 64.
To the bolster 64
Main body case 113 fixed to the lower surface of the main body case 113, a mesh filter (not shown) is attached to a predetermined location, a scrap box 114 housed inside the main body case 113, and a vacuum suction port 117 of the main body case 113 And a solenoid valve 11 attached to the suction comb 118 that is fixed below the main body case 113 in communication with the main body case 113.
9 and an air tube 120 for connecting a suction converm 118 and a vacuum suction source such as a vacuum device.

The scrap suction device 54 punches the workpiece 49 as shown in FIG. 2 by turning on and off the solenoid valve 119 by the control unit 50 in conjunction with the rotation of the rotary cam 68. At the timing before and after the processing, the suction conveyor 118 operates and the scrap discharge passage 11 is operated.
1 generates a suction force of air, and forcibly sucks and removes scraps and dust generated by the punching process from the processing area, and stores the scraps and dust in the scrap box 114. As shown in FIG. 2, the scrap suction device 54 starts operating immediately after the positioning of the workpiece 49 by the material transfer device 53 is completed. Can be prevented, and at the end of positioning of the workpiece 49, the workpiece 49 can be instantaneously sucked into the die opening 137a of the die 137 described later, and the workpiece 49 can be stopped without flapping. . Thereby, the processing speed and the processing accuracy of the punching process are improved.

FIG. 4 is a cut-away side view of the mold device 44 and the work holder 59 mounted on the electric press machine shown in FIG. In the figure, the upper mold 47 of the mold device 44 is
A plurality of guide bushes 1 for positioning with respect to the lower mold 48
22, a base 121 fixed to the ram 43 via the mounting hole 123, a punch holder 124 fixed to the base 121, a stripper plate 127 held by the hanger 30, a stripper guide pin 125, and a drilling tool. And a punch 31 as a main component.

The punch 31 and the stripper guide pin 125 are attached to the punch holder 124 so as to protrude at the lower portions thereof and hang down. The stripper plate 127 is arranged so that the lower part of the punch 31 can be inserted therein and can move vertically in the vertical direction while being slid and guided by the stripper guide pins 125 inserted in a positioning state via the plurality of retainers 128. Further, the stripper plate 127 is constantly urged downward via an eject pin by a spring 129 provided on the base 121, and is pressed against the hanger 30 when the upper die 47 is separated from the lower die 48 during non-processing. For this non-machining, the cutting edge 31a at the tip of the punch 31 is
7 is housed.

In the present invention, the upper mold 47 of the mold apparatus 44 is used.
Since the material transfer device 53 including the work holder 59 is arranged between the lower die 48 and the lower die 48, the stripper guide pins 12
5 guides the vertical movement of the stripper plate 127 without protruding from the stripper plate 127 even during the punching process. The spring 129 is housed in the base 121 while maintaining the initial bending spring force by the horo set 131. Further, the base 121 is positioned relative to the lower mold 48 and vertically moved up and down by the guide post 40 being slidably inserted into the retainer 132.

On the other hand, the lower mold 48 in the mold apparatus 44
A base 133 fixed to the bolster 64 via the mounting hole 135, a die holder 134 fixed to the upper surface of the base 133, a die 137 fixed through the center of the die holder 134; 133 and the above-mentioned guide post 40 provided upright.

The die 137 has a cutting edge 31 a of the punch 31.
And a die opening 137a for receiving the
A plurality of suction nozzle holes 137b are formed penetrating downward from the periphery of a. The base 133 is formed with a communication path 138 that communicates each suction nozzle hole 137 b with the scrap discharge path 111 of the bolster 64.
Therefore, when the scrap suction device 54 is operated, dust at the processing location around the die opening 137a is sucked and removed from each suction nozzle hole 137b.

The work holder 59 in the material transfer device 53 is configured to also serve as the die holder 134 of the lower die 48. That is, the work holder 59 slides on the die holder 134, the linear ball bush 139 laid horizontally and embedded on both sides of the center of the die holder 134, and penetrates horizontally through the die holder 134. Two (1) freely held
(Only one is shown), a positioning holder 141 attached to one end and a vicinity of the other end of each slide shaft 140, a material mounting frame 142 fixed on the positioning holder 141,
A plurality of material pressing members 143 for fixing the material 49 to be processed on the material mounting frame 142, and a swing connection provided at the other end of the slide shaft 140 and connected to the connection portion 110 of the transport plate 109 in FIG. And a section 144.

FIG. 5 is an enlarged side view of the swing connection portion 144 with a part thereof broken. The swing connection portion 144 includes a base 147 fixed to the positioning holder 141 and the base 147.
On the other hand, a connecting member 249 having one end rotatably connected via a bearing 148 embedded therein and a support pin 149 fitted into the bearing 148, and a connecting member 249 connected to the other end of the connecting member 249. It is composed of a buried bearing 150 and a mounting member 152 connected to the bearing 150 so as to be able to move up and down slightly via a connecting pin 151 fitted into the bearing 150. In the mounting material 152,
The connecting portion 110 of the transport plate 109 in the material transfer device 53 is matched with the mounting screw hole 153 of the mounting material 152,
The bolt 154 is inserted through the connecting portion 110 to attach the mounting screw hole 15.
3, the transport plate 109 is connected.

The swing connecting section 144 is connected to the material transporting section 53.
The small displacement and twist generated when connecting the transport plate 109 to the work holder 59 during the assembly of the workpiece or the small displacement and twist caused by continuously transporting the workpiece 49 by the work holder 59 are reduced by the connecting member. 249 relative to base 147 or mounting 152
Of the connecting member 249 in the vertical direction.

Therefore, when the rotation of the transport servomotor 61 is controlled by the control unit at the timing and operation time shown in FIG. 2, the transport plate 109 moves along the transport path set by the guide rails 58a and 58b. The workpiece holder 59 moves accurately, and the work holder 59 is accurately moved along the transport path set by the linear ball bush 139. Thus, the workpiece 49 can be accurately positioned while being transported at a fine pitch. Further, since the work holder 59 for holding the workpiece 49 is disposed between the upper die 47 and the lower die 48, the positional relationship between the punch 31, the die 137 and the workpiece 49 is held with high accuracy. And the accuracy of the repetition of the punching process is improved.

[0056]

As described above, according to the press working method according to the first aspect of the present invention, since the collision resistance at the time of working is reduced, the work material can be transferred inside the mold apparatus, Fine positioning of the workpiece and automatic change of the transfer pitch can be performed, and the same workpiece shape can be machined on the workpiece with high repetition accuracy. Further, since the processing area is always cleaned, it is possible to prevent the material to be processed from being damaged by scraps and dust, and to maintain stable processing accuracy.

Further, according to the electric press machine of the second aspect of the present invention, it is possible to attenuate the micro-vibration generated at the time of machining and the micro-vibration generated from the driving source by the main body frame.
Also, by controlling the moving speed of the upper die to be reduced during processing, it is possible to reduce the collision resistance during processing, and furthermore, it is possible to always clean the processing area. Changes can be made, and the same machining shape can be machined with high repetition accuracy on the workpiece, and stable machining accuracy can be maintained.

As a result, it is possible to achieve a finer processing shape and a higher precision in the material to be processed.

According to the electric press machine of the third aspect of the present invention, since the main body frame has a gate-shaped structure, rigidity is improved, and generation of vibration can be suppressed. Further, since the point of action and the point of force of the drive are set on the axis of the rotating cam, loss of kinetic energy and generation of vibration can be suppressed. Furthermore, since the cam holder and the connecting mechanism are connected by slidably and rotatably engaging the engaging convex portion with the spherical engaging concave portion, the connecting portion absorbs bending and torsion caused by centrifugal force. Alignment can be performed, and generation of vibration can be further suppressed.
In addition, since the guide post is slidably inserted into the guide hole of the main body frame with a stroke bearing interposed, the ram is guided up and down, so the stress during conversion from rotary motion to linear motion can be reduced. , The dynamic accuracy is improved. Furthermore, since the sensor is disposed at the axis of the rotating cam and can accurately detect the rotation speed and position of the rotating cam, various controls by the control unit can be performed with high accuracy.

According to the electric press machine of the fourth aspect of the present invention, since the transport drive section and the transport guide section are provided with the base made of a material capable of rapidly attenuating the vibration, various vibrations can be propagated. Can be reduced. In addition, since the transport plate is movably held across the guide rails on both sides, stress applied to the guide rail during transport can be reduced, and yawing can be prevented. Thereby,
The material to be processed can be transferred with high precision at a fine pitch.

According to the electric press machine of the fifth aspect of the present invention, scrap and dust generated by machining can be forcibly and quickly sucked and removed, and the workpiece to be worked after positioning can be instantaneously lowered. Since it can be stopped by being attracted to the surface, there is an advantage that the processing speed and the processing accuracy can be improved.

According to the electric press machine of the sixth aspect of the present invention, the processing area can be locally cleaned by providing the plurality of suction nozzle holes. In addition, since the work holder is connected to the transport plate of the material transfer device via the swing connection portion, it is possible to absorb a small positional shift that occurs when the mold device is attached and a torsion that occurs when the mold device is connected.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a press working system according to an embodiment that embodies a press working method of the present invention.

FIG. 2 is an explanatory diagram of control of one working cycle in the press working system.

FIG. 3 is a side view in which main parts of the electric press machine used in the press working system are cut away.

FIG. 4 is a longitudinal sectional view showing a mold apparatus of the electric press machine.

FIG. 5 is a side view in which a part of an oscillating connecting portion that connects the transfer plate and the work holder in the material transfer device provided in the die apparatus is cut away.

FIG. 6 is a schematic longitudinal sectional view showing a conventional electric press machine.

FIG. 7 is a longitudinal sectional view showing a mold device in the electric press machine.

[Explanation of symbols]

 Reference Signs List 31 punch (working tool) 31a cutting blade 41 pressing mechanism 43 ram 44 mold device 47 upper die 48 lower die 49 work material 50 control unit 53 material transfer device 54 scrap suction device 57, 57a, 57b base 58, 58a , 58b Guide rail 59 Work holder 60 Ball screw 61 Servo motor of transport drive source 62 Body frame 68 Rotating cam 73 Servo motor of pressure drive source 81 Rotary encoder (sensor) 84 Cam holder 85 Linking mechanism 88 Engagement recess 90 Engage Convex portion 102 Guide post 103 Guide hole 104 Stroke bearing 107 Transport drive unit 108 Transport guide unit 109 Transport plate 110 Connection unit 111 Scrap discharge passage 114 Scrap box 118 Convum (suction force generating means) 137 Die 137a Die opening 137b Suction nozzle hole 144 Swing connection

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI B30B 15/04 B30B 15/04 A 15/20 15/20 D // B21D 43/02 B21D 43/02 E

Claims (6)

[Claims] In a press working method for performing punching or the like on a thin plate-like workpiece by an upper mold and a lower mold of a mold apparatus, the workpiece having a predetermined shape is guided by the lower mold. By fixing the work holder to a moving work holder, and operating the work holder only in a section where the upper mold is separated from the lower mold by a certain distance or more in a machining cycle corresponding to one vertical movement of the upper mold. ,
The workpiece is transferred at a predetermined pitch and positioned in a processing area of the mold apparatus, and the moving speed is controlled so that the upper die is decelerated in a section descending from a predetermined position to a bottom dead center in the processing cycle. When the upper mold reaches the bottom dead center, the workpiece is machined with the upper mold working tool, and the upper mold in the machining cycle approaches the lower mold within a certain interval. A press working method, wherein air is drawn from the working area to below the workpiece in a section where the air is flowing. 2. A main body frame made of a material capable of rapidly attenuating vibration, an upper mold and a lower mold, and a mold device mounted on a central portion of the main body frame; A pressurizing mechanism for raising and lowering in the vertical direction; a material transfer device for intermittently transferring a fixed material to be processed having a predetermined shape at a predetermined pitch while being guided by the lower mold; and A scrap suction device for performing vacuum suction to generate a flow of air downwardly of the workpiece, and driving of the pressurizing mechanism, the material transfer device and the scrap suction device corresponds to one vertical movement of the upper die. A control unit configured to control for each processing cycle to be performed, wherein the control unit lowers the moving speed of the upper die up and down with respect to the pressing mechanism unit from a predetermined position in the processing cycle to a bottom dead center. In the machining cycle, the upper die in the processing cycle is controlled to operate only in a section separated from the lower die by a predetermined distance or more, and the scrap suction device is controlled in the processing cycle. An electric press machine wherein the upper die is controlled to operate only in a section that is close to the lower die within a predetermined interval. 3. The main body frame has a gate-shaped structure, and the pressurizing mechanism includes a servomotor of a pressurizing drive source installed on the upper surface of the mainframe, and direct transmission of the rotation of the servomotor. A rotating cam, a sensor arranged at the axis of the rotating cam and detecting its rotation, a cam holder fitted to the rotating cam so as to swing up and down by the rotation thereof, A coupling mechanism for converting a swinging motion into a linear motion, and a ram having an upper end connected to the coupling mechanism and vertically moved in the vertical direction, and an upper die fixed to the lower end; The connection mechanism is connected to the spherical engagement recess at the lower portion of the cam holder by the engagement protrusion at the upper end of the connection mechanism slidably and rotatably engaged with the connection holder. Multiple vertical installations A guide post is slidably inserted into a guide hole of the main body frame via a stroke bearing, and the control unit performs feedback control of the servomotor based on rotation detection data of the rotary cam input from the sensor. The electric press machine according to claim 2, which is configured as described above. 4. A material transfer device, comprising: a transport drive unit and a transport guide unit which are disposed on both sides of a processing area on an upper surface of a lower die, and guide rails of each of the transport drive unit and the transport guide unit. A transfer plate held movably over the work plate, a work holder fixed to the workpiece and movably provided while being guided by the lower mold, and connected to a connection portion at a central portion of the transfer plate; The transport drive unit comprises: a base made of a material capable of rapidly attenuating vibration; the guide rail positioned and fixed to the base; a servo motor of a transport drive source; A ball screw configured to move the transfer plate by rotation of a motor, wherein the transfer guide portion includes a base made of a material capable of rapidly attenuating vibration; Of consists and the guide rail that is fixed in position on the base, the servo motor electric press machine according to claim 2 or 3 configured to be rotated and controlled by the control unit. 5. A scrap box fixed to a lower end portion of the main body frame by communicating with a scrap discharge passage provided to communicate with a lower end portion of the main body frame from a processing area in the lower die. 3. A suction force generating means for applying a suction force of air to the processing area through the scrap box and the scrap discharge passage, wherein the suction force generating means is configured to be operated and controlled by a control unit. An electric press machine according to any one of claims 1 to 4. 6. A mold device comprising: an upper die having a punch mounted thereon as a processing tool; and a lower die having said die mounted with a die opening of said die opposed to a cutting blade of said punch so as to insert said die. A plurality of suction nozzle holes communicating with the scrap discharge passage of the main body frame from the periphery of the die opening are formed in the die, and the work holder movably held in the lower die is transported by the material transfer device. The electric press machine according to claim 5, further comprising a swing connection portion that swingably connects to the connection portion of the plate.