JP4443709B2 - Press method and press apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a press machine that can perform shearing, bending, drawing, various forming processes, compression, and bonding, as desired, and a small high-speed press machine such as a dieing type press machine rather than a large-scale large-capacity machine. A press machine in which the upper die is fixed to a slide that reciprocates with respect to the lower die fixed to the bed bolster, and the slide reciprocating movement is driven by a linear motor. Press working method and its machine About.
[0002]
[Prior art]
In recent years, high-speed and stable positioning has been adopted to form high-precision small parts that require relatively small loads and require high-precision positioning. Lines with high precision A press apparatus that employs a linear motor as a drive source for the slide lifting mechanism is used. When a linear motor is employed as a drive source for the slide lifting mechanism, the precision positioning of the linear motor and efficient power transmission with a short acceleration / deceleration time enable high-speed molding of precision small parts.
[0003]
On the other hand, when a linear motor is used, the movable part including the slider is driven up and down by the thrust generated by the linear motor, and the high pressure is applied to the workpiece by the thrust of the linear motor to maintain high positioning accuracy. I have to. Therefore, in order to increase the applied pressure in a controllable state, it is necessary to increase the rated thrust that can be generated by the linear motor. However, when the rated thrust of the linear motor is increased, the linear motor becomes larger in proportion to it. For this reason, attempts have been made to reduce the load on the linear motor by reducing the weight of the movable part or by supporting the weight of the movable part by a balance device so that the weight of the movable part can be substantially zero. .
[0004]
For example, Japanese Patent Laid-Open No. 11-239897 discloses a linear motor composed of a magnet plate and a slider, a head that moves up and down by the thrust of the linear motor, a mold attached to the head, and the weight of the head as a spring. A press device is disclosed that includes a counter balancer that is balanced by the urging force. In this press apparatus, a pressurizing force for pressurizing a mold is generated by a thrust of a linear motor, and a movable part such as a head is supported by a spring to balance the weight of the head.
[0005]
[Problems to be solved by the invention]
Generally, in a press device that uses the thrust of a linear motor, when the slider is lowered, it receives an upward load on the mold, and when the slider is raised, it receives a downward load on the mold. The direction of the load is constant with respect to the moving direction. Further, since the linear motor generates a uniform thrust and drives the load directly regardless of the position of the slider, it has excellent acceleration and accuracy characteristics. However, since the linear motor generates all thrust by the magnetic attractive force, if the applied pressure is increased without impairing the controllability of the linear motor, the linear motor becomes larger and the device becomes expensive. Economic competitiveness is lost. Furthermore, power consumption increases in proportion to thrust. Accordingly, an object of the present invention is to provide a press apparatus and a press method that can increase the thrust of the linear motor without increasing the size of the linear motor and without impairing the controllability of the linear motor.
[ 0006 ]
[Means for Solving the Problems]
The object of the present invention described above is ( 1 ) In a pressing method in which an upper die is fixed to a slide that reciprocates with respect to a lower die fixed to a bolster on a machine base, and the workpiece is pressed by reciprocating the slide, the slide is moved to a linear motor While the position of the slide is detected by thrust, it is moved in the pressurizing direction, and when the slide reaches the preset first position, the pressurizing direction is applied to an air cylinder that supports the slide in a freely reciprocating state. The slide is moved in the pressurizing direction while supplying air of a required pressure so that the thrust is generated and the linear motor generates a thrust against the thrust, and the slide is set at a second position set in advance. Press method in which the slide is moved to the bottom dead center while pressurizing the workpiece with the thrust of the linear motor as the thrust in the pressurizing direction. By it is better achieved.
[ 0007 ]
The object of the present invention is as follows. (2) In a pressing method in which an upper die is fixed to a slide that reciprocates relative to a lower die fixed to a bolster on a machine base, and the workpiece is pressed by reciprocating the slide, the slide can be freely reciprocated. With the air in the lower chamber of the cylinder partitioned by the piston of the air cylinder supported in the exhausted state being exhausted, a plurality of guide posts connected and fixed to the slide and guided by the guide member are moved by the linear motor thrust to the position of the slide. The process of moving in the pressurizing direction while detecting the pressure, and when the slide reaches the preset first position, the air of the required pressure is supplied to the upper chamber of the cylinder partitioned by the piston of the air cylinder To generate thrust in the pressurizing direction, and do not generate thrust in the linear motor that opposes the air cylinder thrust. Further moving the slide in the pressurizing direction, pressurizing the workpiece with the thrust of the linear motor as the thrust in the pressurizing direction when the slide reaches a preset second press position, Just before the slide reaches the bottom dead center, the air supply to the upper chamber of the cylinder is switched to the exhaust state, and the air is supplied to the lower chamber of the cylinder with the required pressure while the slide is moved to the top dead center by the thrust of the linear motor. This is better achieved by a pressing method comprising a moving step.
[ 0008 ]
The object of the present invention is as follows: 3 ) The thrust of the air cylinder generated in the pressurizing direction is less than the thrust that the linear motor can output. (1) or (2) This is achieved by adopting a less method.
[0009]
The above-mentioned objects of the present invention are as follows: (4) An upper die is fixed to a slide that reciprocates with respect to a lower die fixed to a bolster on a machine base, and a workpiece is formed by reciprocating the slide. In the press device to be processed, a linear motor that reciprocally moves a plurality of guide posts that are connected and fixed to the slide and guided by a guide member, and a position detection device that detects the position of the reciprocating slide; Deviation between a predetermined position command and a detected position from the position detecting device Connected to each of the upper chamber and lower chamber of the cylinder partitioned by the piston in the air cylinder, the drive control device for driving the linear motor based on the above, the air cylinder for supporting the slide in a reciprocating manner Provided between the air supply / exhaust pipe and the air source, Switching control device that switches between supply and discharge of air based on a predetermined command When, The predetermined position command is output to the drive control device to control the drive of the linear motor, and the switch control device is configured to increase the pressurizing force in press in synchronization with the reciprocating movement of the slide. Control device for controlling the switching between supply and discharge of the air This is better achieved by using a press apparatus used for carrying out the pressing method according to (1), (2) or (3).
[0010]
Also, the object of the present invention is as follows: (5) The upper die is fixed to a slide that reciprocates with respect to the lower die fixed to the bolster on the machine base, and the workpiece is molded by reciprocating the slide. A linear motor that reciprocally moves a plurality of guide posts that are connected and fixed to the slide and guided by a guide member, and a position detection device that detects a position of the reciprocating slide. Deviation between a predetermined position command and a detected position from the position detecting device Connected to each of the upper chamber and lower chamber of the cylinder partitioned by the piston in the air cylinder, the drive control device for driving the linear motor based on the above, the air cylinder for supporting the slide in a reciprocating manner Provided between the air supply / exhaust pipe and the air source, Based on the prescribed directive A three-way solenoid valve that switches between supply and exhaust of air in the upper and lower chambers of the air cylinder, and the three-way valve to set the supply pressure from the air source to the required set pressure. electromagnetic An air pressure setting device connected to the valve; While outputting the predetermined position command to the drive control device and performing drive control of the linear motor, outputting the predetermined command to the three-way solenoid valve, (1), (2), having a control device that performs control to switch the three-way solenoid valve to increase the pressurizing force of the slide and to apply auxiliary thrust to the linear motor when the slide moves in the pressurizing direction. Or it can achieve better by setting it as the press apparatus used for implementation of the press method as described in (3).
[ 0011 ]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 and FIG. 2 are configuration explanatory views of an embodiment when the press device according to the embodiment of the present invention is applied to a stamping press machine for punching a flexible substrate, for example, a BGA film with high speed and high accuracy. 1 is a longitudinal sectional view of a press device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state cut along line AA ′ in FIG.
[ 0012 ]
Reference numeral 1 denotes a hollow box frame-like machine base, and four guide posts 3 whose upper end portions are fixedly attached to the slide 2 are respectively inserted into the square frame plates 1A and 1B at the upper and lower ends. A guide member 4 such as a motion ball bearing is provided, and a bolster 5 to which a lower die is attached to an upper die (not shown) attached to the slide 2 is provided on the upper surface of the upper end frame plate 1A. The linear motors 6 and 7 having a thrust of 6 KN (≈612 kgf) 8 pieces, figure Place to show The left of each guide post 3 Two each on the right side surface are arranged side by side so as to be able to act on the vertical direction. That is, in the illustrated case, 6A and 7A are exciting coils or yoke iron cores attached to the inner wall on the left and right sides of the machine base 1 facing each other. And winding Stator 6B, 7B composed of a repetitive excitation coil is a magnet plate connected to the guide post 3 so as to be opposed to the stator 6A, 7A with a small gap therebetween, and a predetermined number of permanent magnet pieces in the vertical movement direction. Adhesive rows are provided.
[0013]
In FIG. 1 and FIG. 2, each guide post 3 is fixed to and integrated with a rotation stop plate 9 at the lower end, but each guide post 3 has two linear motors 6 independently of each other. 7 is provided. The linear motor has magnet plates 6B, 6B, 7B, 7B each having a predetermined number of permanent magnet pieces attached to a vertically long soft magnetic plate in the moving direction with their surfaces facing each other attached to each other, In the state where the guide posts 3 and 3 are sandwiched, the coupling plates 6D, 6D, 7D, and 7D are coupled to each other, and the magnet plates 6B and 7B are fixed to the guide posts 3 by welding or taper pins 6E and 7E in the illustrated case. The magnet plates 6B and 7B, the guide posts 3, 3 and the slide 2 are integrated to form a mover of the linear motor. The other stator is a yoke iron core in which silicon steel plates are laminated and electromagnets 6A, 6A, 7A, 7A in which an exciting coil is wound as desired. The stator mounting plates 6C, 6C, 7C, An oil cooling cooling pipe or the like is attached to 7C, and the yoke iron core field surfaces are arranged on the surfaces of the permanent magnet pieces of the magnet plates 6B, 6B, 7B, 7B, for example, 0.6 to The mounting plates 6C and 7C are mounted and adjusted to mounting windows formed on the machine base 1 so as to face each other with a minute gap of about 0.8 mm. That is, each guide post 3 is disposed in a state of being inserted through hollow columnar stator mounting frames 1C and 1D that are connected and fixed to the upper and lower machine bases 1, and the mounting frames 1C and 1D face each other. The stators 6A and 7A made of the electromagnets are fitted into the mounting windows 1E formed on both side surfaces, and the positions are adjusted and firmly fixed.
[0014]
As described above, each guide post 3 is directly attached as an attachment configuration in which the magnet plate movers 6B and 7B of the pair of linear motors 6 and 7 are directly attached to both sides of each guide post 3 so as to face each other. Since it is directly driven by a linear motor, the moving part can be made lighter, and it is not necessary to use a large-capacity linear motor with a large thrust, resulting in lighter weight, better responsiveness, and higher speed. It will be possible to move with.
[0015]
Reference numeral 10 denotes an air balancer, which fixes the top of the cylinder 10A to the machine base 1 below the bolster 5, and connects and fixes the tip of the piston rod 10C connected to the piston 10B to the center of the detent plate 9 in the illustrated case. By introducing air of a predetermined pressure into the lower chamber 10E via an air regulator or the like, the above-described slide 2, four guide posts 3, and two linear motor magnet plates 6B, 7B provided on each guide post 3, Further, the movable elements (hereinafter referred to as movable parts) of the linear motors 6 and 7 comprising the rotation stop plate 9 are held by the machine base 1 so that the excitation current of the linear motors 6 and 7 is zero. . While acceleration of the descending and raising of the slide 2 is affected by the acceleration of gravity, the excitation current becomes zero when the speed at the top dead center and the bottom dead center is zero, and during the period from the start of molding to the bottom dead center. Excitation current that generates a force necessary for pressing may be used, and excitation may be performed to generate a force that maintains the speed when moving at a substantially constant speed in the descending and rising regions of the slide stroke. In this way, when molding is performed with the pressure applied by the thrust of the linear motor, the air balancer 10 functions as a balance device that supports the weight of the movable part, and accordingly, the exciting current to the linear motor can be reduced, and the coil The heat generation can be suppressed.
[0016]
Reference numeral 11 denotes a linear encoder composed of a linear scale 11A and a sensor 11B. In the case shown in the figure, the scale 11A is attached to the machine base 1 of the fixed part, the sensor 11B is attached to the slide 2, and the position of the slide 2 on the slide stroke is read. It detects the position of the entire movement path of the slide 2 in response to a slide motion command from a control device such as a numerical control device for press processing using a personal computer (not shown). The deviation at the same coordinate position including the bottom dead center position between the motion pattern of the slide motion of the command from the apparatus and the actual movement pattern of the slide 2 is detected and calculated, and the deviation is larger or larger than a predetermined value. Can be corrected according to the frequency of occurrence of the condition greater than a predetermined value, etc., and this correction Constantly and desirable part of the kinetic pattern, or because it is possible in whole, it is possible to maintain the accuracy of the press working.
[0017]
FIG. 3 is a block diagram for explaining an aspect of drive control of the linear motors 6 and 7 and the air balancer 10, and the former method of position, speed, and thrust control will be described. A control device 12 such as an NC device is provided with a feed-forward control unit (not shown) in parallel and outputs a slide motion position command to a position / speed control unit 13 having a position control unit and a speed control unit. A deviation between the command and the feedback detection position signal from the linear encoder 11 is calculated, and the position control unit calculates a deviation according to a predetermined gain based on the position deviation, and outputs a speed command. Then, a differential signal of an appropriate prefetch signal of the feedforward control unit position command provided in accordance with the speed command is added, and then a deviation of the speed signal generated from the feedback detection position signal from the linear encoder 11 is taken, and the speed Based on the deviation, the speed control unit calculates according to a predetermined gain and outputs a current command. Then, the second derivative signal of the prefetch signal of the position command of the feedforward control unit provided as needed is added to the current command, and then the thrust generated from the current control unit 14 to the linear motors 6 and 7 is generated. A deviation of a current signal obtained by detecting and feeding back the exciting current 14A is calculated, and the current controller 14 calculates a deviation according to a predetermined gain based on the current deviation, and a current corresponding to the predetermined thrust is obtained from a servo amplifier by a linear motor. 6 and 7 to excite the exciting coils 6A and 7A.
[0018]
Then, from the start of calculation of the position command from the control device 12 and the feedback detection position signal from the linear encoder 11, the excitation current controlled to be predetermined from the current control unit 14 is output, and the linear motor 6, A series of control loops until 7 is actuated to a predetermined time starts within about 10 msec, preferably about 2 msec, and starts to come into contact with the workpiece through the descending region from the start of top dead center. From the machining start point, bottom dead center position, and separation from the workpiece, until it returns to the top dead center position through the ascending area, it is repeatedly captured at high speed one after another, and temporarily stored as necessary. Is stored and the slide 2 is driven by controlling the linear motors 6 and 7 at a high speed, so that the slide 2 is combined with the operation of the air balancer 10 described later. For example, accelerating at an acceleration of about 1G to 2G, so move at least several 10 m / min approximately, or more high speed can be performed press working.
[0019]
The movable part driven by the thrust of the linear motors 6 and 7 is supported by the air balancer 10 as described above, and the air balancer 10 is connected to a switching control device that supplies and switches a required air pressure by a supply / exhaust pipe. . This switching control device is composed of air regulators 15B and 16B and three-way solenoid valves 15A and 16A, and switches and controls the air supplied from the air source 17 according to a command from the control device 12, as will be described later.
[0020]
FIG. 4 is a circuit diagram of an air pressure switching control device including a thrust assist circuit and an air balancer circuit used in the press device according to the embodiment of the present invention. A thrust assist circuit 15 assists the thrust of the linear motors 6 and 7, and is an air regulator that adjusts the pressure of the air supplied to the upper chamber 10D of the three-way solenoid valve 15A and the cylinder 10A to switch the operation of the air balancer 10 to a predetermined pressure. 15B and an air supply / exhaust pipe 15C for supplying / exhausting air to / from the upper chamber 10D. 16 is an air balancer circuit for operating the air balancer 10, a three-way solenoid valve 16A for switching the operation of the air balancer 10, an air regulator 16B for adjusting the pressure of air supplied to the lower chamber 10E of the cylinder 10A to a predetermined pressure, and And an air supply / exhaust pipe 16C for supplying / exhausting air to / from the lower chamber 10E. The three-way solenoid valves 15A and 16A perform switching operation based on a command from the control device 12. In the air regulator 15B, the supply air pressure is set so that the air balancer 10 generates a force less than the rated thrust that the linear motors 6 and 7 can output. In the air regulator 16B, the exciting current of the linear motors 6 and 7 is a movable part. The supply air pressure that is substantially zero in the stop state is set. Reference numeral 17 denotes an air source that supplies air to the upper chamber 10D and the lower chamber 10E of the cylinder 10A. Normally, the thrust assist circuit 15 is open to the atmosphere, and the air balancer circuit 10 is pressurized by the set pressure of the air regulator 15B. When the thrust assist state is established, the three-way solenoid valves 15A and 16A are energized, the thrust assist circuit 15 is pressurized, and the air balancer circuit 16 is opened to the atmosphere. The energization switching of the three-way solenoid valves 15A and 16A can be operated and adjusted at an arbitrary angle in synchronization with the press position (0 to 360 °), and is input from the input device of the control device 12 of the press device. Is done.
[0021]
Next, operation | movement of the press apparatus which concerns on embodiment of this invention is demonstrated. FIG. 5 is a timing chart for explaining the operation of the press device according to the embodiment of the present invention. FIG. 5 (A) shows the slide position, FIG. 5 (B) shows the air pressure control, and FIG. (C) shows the thrust of the linear motor. 5A, 5B, and 5C, the horizontal axis represents the time axis, and the vertical axis represents the distance, pressure, and thrust value (N). In this example, one press cycle is 0.2 sec. The operation will be described as follows.
[0022]
(Time T ₁ Until time T shown in FIG. ₁ Until, the air balancer 10 applies a reaction force that balances the weight of the linear motors 6 and 7 such as the slide 2 to the weight, and the movable part stops at the top dead center position without moving up and down. Is in a state. At this time, the three-way solenoid valve 15A shown in FIG. ₂ And the upper chamber 10D of the cylinder 10A is opened to the atmosphere. On the other hand, in the three-way solenoid valve 16A, the port A and the port P are connected, and the air regulator 16B goes to the lower chamber 10E of the air balancer 10 so that the stator exciting coil current of the linear motors 6 and 7 becomes substantially zero. The supply air pressure is adjusted to a predetermined value. As a result, the movable part such as the slide 2 is supported by the air balancer 10 in a state where the movable part can reciprocate and stops at the top dead center position. In the present embodiment, the state set to 0.2 MPa is shown.
[0023]
(Time T ₁ To time T ₂ Until time T shown in FIG. ₁ To time T ₂ In the period, the movable part such as the slide 2 is an acceleration obtained by adding the gravitational acceleration 1G to the acceleration of about 0.5 G due to the thrust of the linear motors 6 and 7, and the first predetermined position set in advance with the passage of time. To descend. At this time, time T ₁ The three-way solenoid valve 16A shown in FIG. ₁ And the lower chamber 10E of the cylinder 10A is opened to the atmosphere, and the air in the lower chamber 10E is exhausted.
[0024]
(Time T ₂ To time T _Three Until the preset position of the first slide 2, ie, time T ₂ Then, the three-way solenoid valve 15A shown in FIG. 4 is switched to connect the port B and the port P, and the air pressure (0.5 MPa in the illustrated case) set in the air regulator 15B is supplied to the upper chamber 10D of the air balancer 10. Then, the air balancer 10 generates a force that lowers the movable part. At this time, the linear motors 6 and 7 resist the downward force generated by the air balancer 10 as shown in FIG. Rising While generating the thrust and maintaining the descending pattern shown in FIG. 5A, the mover part such as the slide 2 is lowered to the press position which is the second position set in advance (time T _Three ). This time T ₂ To time T _Three Is set so that the auxiliary thrust generated by the air cylinder 10A is less than or equal to the rated thrust of the linear motor, the movable part can be accurately moved and positioned.
[0025]
(Time T _Three To time T _Four Until time T shown in FIG. _Three At this point, the ascending thrust of the linear motors 6 and 7 generated against the thrust in the descending direction of the air cylinder 10A is switched to the descending direction and used as the thrust in the pressurizing direction. By this control, the downward thrust generated by the air cylinder 10A is added to the downward thrust generated by the linear motors 6 and 7, and the workpiece is pressurized with a pressurizing force increased approximately twice. However, the mover part of the slide 2 etc. _Four ). Also, the time T when this bottom dead center is reached _Four About 10 to 30 msec before the three-way solenoid valve 15A is connected to port B and port R ₂ And the air release of the upper chamber 10D of the cylinder 10A is started. Since the exhaust time is limited by the diameter of the supply / exhaust pipe, it is preferable to use one having a large cross-sectional area.
[0026]
(Time T _Four To time T _Five Until time T shown in FIG. _Four To time T _Five Until, linear motors 6 and 7 Rising Thrust is generated, and the mover part such as the slide 2 rises to the top dead center position. At this time, the three-way solenoid valve 15A shown in FIG. ₂ Are connected to each other, the air in the upper chamber 10D of the cylinder 10A begins to exhaust, and the three-way solenoid valve 16A _Four Thus, the port A is connected to the port P, and air is supplied from the air regulator 16B to the lower chamber 10E of the air balancer 10 so that the stator exciting coil current of the linear motors 6 and 7 becomes substantially zero. Due to the upward thrust of the air balancer 10 generated by the air pressure, the weight of the movable part becomes substantially zero, and the movable part such as the slide 2 can be moved to the top dead center at a high speed with an acceleration of about 1.5 G.
[0027]
Although the present invention has been described based on the illustrated embodiment, the present invention can be implemented by changing each part without departing from the spirit of the present invention. For example, according to the present invention, each guide post is configured to be driven by a linear motor, but the strong magnetic attraction forces of two pairs of linear motors at each guide post are offset and balanced. In other words, the direction of the arrangement of the pair of linear motors in each guide post is the same as that shown in FIG. 2 (FIG. 2). Not only can the orientation be changed 90 ° sequentially along the outer periphery, or all four sets can be placed in the desired disjoint directions, but the electromagnet stators 6A and 7A are fixed bases. For example, instead of the hollow columnar mounting frames 1C and 1D of the illustrated embodiment, a large mounting plate formed with two windows for mounting the upper and lower stators at the left end of FIG. Up and down the table Alternatively, it may be mounted in a manner fixed to the front and rear wall surfaces, and two other stators may be mounted in the same manner, and the mounting plate with the left and right upper and lower stators attached and the right and lower upper and lower stators Are attached by connecting plates along the upper and lower wall surfaces of FIG. 2, and a similar coupling configuration can be given to the four inner stators, and For example, the air balancer 10 is also configured such that two are provided at the upper and lower ends of the center in FIG. 2 or two at the left and right ends of the center, or the cylinder side is further fixed to the mover side. Also good.
[0028]
As described in detail above, according to the present invention, the pressurizing force is increased by the pneumatic pressure of the air cylinder within the controllable range of the linear motor, so that the controllability of the linear motor is up to about twice as much without impairing the controllability. Can be obtained. Further, by switching the pressurizing direction of the air cylinder in synchronization with the reciprocating movement of the slide, it is possible to reduce the load applied to the linear motor that is the slide drive source and to move at high speed. Furthermore, the thrust assist range is set to the linear motor control range (rated thrust range), and the total thrust including assist is controlled by the linear motor, so the linear motor is not enlarged and the cost is not increased significantly. Thrust can be doubled. In addition, according to the present invention, the thrust can be increased at a price increase of about 1/3 compared with a press machine that obtains thrust only with a linear motor, and the installation space can be reduced to about 2/3.
[ 0029 ]
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a press device according to an embodiment of the present invention.
2 is a cross-sectional view showing a state cut along line AA ′ of FIG. 1; FIG.
FIG. 3 is a schematic block diagram for explaining an embodiment of a drive control apparatus for a linear motor and an air balancer according to the present invention.
FIG. 4 is a circuit diagram of a thrust assist circuit and an air balancer circuit of the press device according to the embodiment of the present invention.
5 is a timing chart for explaining the operation of the press device according to the embodiment of the present invention, FIG. 5 (A) shows a slide position, FIG. 5 (B) shows air pressure control, and FIG. (C) shows the thrust of the linear motor.
[Explanation of symbols]
1, machine stand
1A, 1B, upper and lower end frame plates
1C, 1D, mounting frame
1E, mounting window
2, slide
3, guide post
4, guide member
5, Bolster
6,7, linear motor
6A, 7A, yoke and exciting coil (stator)
6B, 7B, magnet plate (mover)
6C, 7C, stator mounting plate
6E, 7E, taper pin
9. Stop plate
10. Air balancer
10A, cylinder
10B, piston
10C, piston rod
11. Linear encoder (position detection device)
11A, linear scale
11B, sensor
12. Control device
13. Position speed controller
14. Current control unit
15. Thrust assist circuit
16. Air balancer circuit
15A, 16A, three-way solenoid valve
15B, 16B, regulator
17. Air source

Claims (5)

In a pressing method in which an upper die is fixed to a slide that reciprocates relative to a lower die fixed to a bolster on a machine base, and the workpiece is pressed by reciprocating the slide.
The slide is moved in the pressurizing direction while detecting the position of the slide by the thrust of a linear motor, and when the slide reaches a preset first position, the slide is supported in a freely reciprocating state. While supplying air of a required pressure so that thrust in the pressurizing direction is generated in the air cylinder, the slide is further moved in the pressurizing direction while generating a thrust against the thrust in the linear motor,
A pressing method in which when the slide reaches a preset second position, the slide is moved to the bottom dead center while pressurizing the workpiece with the thrust of the linear motor as the thrust in the pressurizing direction. In a pressing method in which an upper die is fixed to a slide that reciprocates relative to a lower die fixed to a bolster on a machine base, and the workpiece is pressed by reciprocating the slide.
A plurality of guide posts connected and fixed to the slide and guided by a guide member are arranged in the linear motor, with the air in the lower chamber of the cylinder partitioned by the piston of the air cylinder that supports the slide reciprocally movable in an exhausted state. Moving in the pressurizing direction while detecting the position of the slide by thrust; and
When the slide reaches a preset first position, air of a required pressure is supplied to the upper chamber of the cylinder partitioned by the piston of the air cylinder to generate a thrust in the pressurizing direction, and A step of further moving the slide in the pressurizing direction while generating a thrust against the air cylinder thrust in the linear motor;
Pressurizing the workpiece with the thrust of the linear motor as the thrust in the pressurizing direction when the slide reaches a preset second press position;
Just before the slide reaches the bottom dead center, the air supply to the upper chamber of the cylinder is switched to the exhaust state and the air is supplied at the required pressure to the lower chamber of the cylinder while the slide is moved to the top dead center by the thrust of the linear motor. A pressing method comprising a step of moving to a position. 3. The pressing method according to claim 1, wherein the thrust of the air cylinder generated in the pressurizing direction is equal to or less than a thrust that can be output by the linear motor. In the press device for fixing the upper die to the slide reciprocating relative to the lower die fixed to the bolster on the machine base, and molding the workpiece by reciprocating the slide,
A linear motor that is connected and fixed to the slide and reciprocally moves a plurality of guide posts guided by a guide member;
A position detection device for detecting the position of the reciprocating slide;
A drive control device for driving the linear motor based on a deviation between a predetermined position command and a detection position from the position detection device ;
An air cylinder for supporting the slide in a freely reciprocating manner;
An air supply / exhaust pipe connected to each of an upper chamber and a lower chamber of a cylinder partitioned by a piston in the air cylinder;
A switching control device that is provided between the air supply / exhaust pipe and the air source, and switches between supply and discharge of air based on a predetermined command ;
The predetermined position command is output to the drive control device to control the drive of the linear motor, and the switch control device is configured to increase the pressurizing force in press in synchronization with the reciprocating movement of the slide. The press apparatus used for implementation of the press method of Claim 1, 2 or 3 characterized by having the control apparatus which outputs the instruction | command of this and performs switching control of the supply and discharge | emission of the said air . In the press device for fixing the upper die to the slide reciprocating relative to the lower die fixed to the bolster on the machine base, and molding the workpiece by reciprocating the slide,
A linear motor that is connected and fixed to the slide and reciprocally moves a plurality of guide posts guided by a guide member;
A position detection device for detecting the position of the reciprocating slide;
A drive control device for driving the linear motor based on a deviation between a predetermined position command and a detection position from the position detection device ;
An air cylinder for supporting the slide in a freely reciprocating manner;
An air supply / exhaust pipe connected to each of an upper chamber and a lower chamber of a cylinder partitioned by a piston in the air cylinder;
A three-way solenoid valve that is provided between the air supply / exhaust pipe and an air source, and switches air supply / exhaust between the upper chamber and the lower chamber of the air cylinder based on a predetermined command ;
An air pressure setting device connected to the three-way solenoid valve to set the supply pressure from the air source to a required setting pressure;
The predetermined position command is output to the drive control device to control the driving of the linear motor, and the predetermined command is output to the three-way solenoid valve so that when the slide moves in the pressurizing direction, 4. The press method according to claim 1, further comprising: a control device that performs control for switching the three-way solenoid valve so as to increase the pressurizing force to apply auxiliary thrust to the linear motor. 5. Press device to use.

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