JP2008043991A - Linear motor-mounted press machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear motor-mounted press machine having a simple constitution while both punch and die are made drivable and the variegation of working is made possible, and further, working with high precision can be performed. <P>SOLUTION: This invention is applied to a press machine where a workpiece W is press-worked by a punch 61 and a die 62. A linear motor 1 for a punch of driving the punch 61 so as to be elevated is set in the upper frame 41b of a press frame 41. A linear motor 1A for a die of driving the die 62 so as to be elevated is set in the lower frame 41c. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a press machine such as a punch press using a linear motor as a drive source.

In a press machine such as a punch press, a press drive source for moving the punch forward and backward generally uses a rotary electric motor that converts to a linear motion by a crank mechanism or the like, or a hydraulic cylinder. As an electric motor, a servo motor has been proposed in which the punching speed during the stroke is variable.
However, since a mechanism using a rotary electric motor requires a mechanism for converting into a linear motion, the configuration becomes complicated. Moreover, since a rotational motion is converted into a linear motion, a lost motion or the like is present and the controllability is poor. Those using a hydraulic cylinder require a hydraulic supply system such as a hydraulic unit, and the structure becomes complicated.

  In addition, an attempt has been made to use a linear motor as a press drive source. When a linear motor is used for driving the punch, unlike a rotary motor, a mechanism for converting rotation into a linear motion is unnecessary, and the number of parts can be simplified.

Conventionally, there is a punch press that performs molding. In a punch press, it is a well-known technique that drilling and forming can be generally performed, and a portion that protrudes from the lower surface of a plate work is formed by using a lower die as a concave die and a punch as a convex die. There is something. Since this molded part protrudes from the lower surface of the plate workpiece, it may interfere with the workpiece feeding on the table. On the other hand, a die that serves as a lower die is a convex die, a punch is a concave die, and a molded part is protruded toward the upper surface side of the work has been put into practical use. In such a convex die, when the die always protrudes from the die height, the lower surface of the workpiece is damaged by the die when the workpiece is fed, so such a convex molding die is always used. There has been proposed one that waits below the die height and protrudes upward during use (for example, Patent Document 1). The die is driven up and down by a cylinder device that moves back and forth in the horizontal direction and a cam or ring mechanism that converts the horizontal motion into a vertical motion.
Japanese Patent Laid-Open No. 11-156459

  A press machine using a conventional linear motor is for driving a punch, and a fixed die is used. When a cylinder device is used as a lifting mechanism for a die when a multi-functional structure is provided in such a press machine in which a die for forming or punching as described above is installed so as to be liftable, The lift stroke is constant. For this reason, it is impossible to perform various molding processes with different protrusion heights. If a servo motor and a ball screw are used as the die lifting mechanism, it is possible to perform molding processing with different protrusion heights, but the configuration becomes complicated in the same manner as that for punch driving.

SUMMARY OF THE INVENTION An object of the present invention is to provide a linear motor-equipped press machine that can be driven with both punches and dies and that can be processed in a variety of ways, can have a simple configuration, and can perform highly accurate processing.
Another object of the present invention is to avoid a manufacturing difficulty and obtain a large output.
Still another object of the present invention is to facilitate the discharge of slag generated during drilling while allowing the die to be driven by a linear motor directly below.
Still another object of the present invention is to enable a variety of machining by driving both a die and a punch for machining a workpiece.

A press machine equipped with a linear motor according to the present invention is a press machine that presses a workpiece with a punch and a die located on a press drive shaft, and is provided on a press frame having an upper frame and a lower frame, and the upper frame. A punch linear motor for driving the punch up and down; and a die linear motor provided on the lower frame for driving the die up and down.
According to this configuration, since the punch is driven up and down by the linear motor, a mechanism for converting the rotation into linear motion is not required, unlike the case of using a rotary motor, and the structure can be simplified with a reduced number of parts. In addition, since the die is also driven up and down by a linear motor, it has a simpler structure, better controllability, and control of the up and down stroke of the die than a horizontal cylinder device, cam, link mechanism, etc. It can be done with high accuracy. In this way, both the punch and die can be driven, allowing for a wide variety of processing, while the linear motor is used to drive both the punch and die, so that a simple configuration can be achieved and high-precision processing is possible. It can be carried out.

In this invention, either one or both of the punch linear motor and the die linear motor is provided with a plurality of unit linear motors whose output shafts are parallel to the press drive shaft center around the press drive shaft core. A unit linear motor assembly may be used.
In punching, a large thrust may be required. In general, a linear motor uses a permanent magnet with a strong magnetic force, but in order to obtain a large thrust with a single linear motor, there are manufacturing limits on the size of the magnet and restrictions on the supply voltage. Is difficult. However, when an aggregate of a plurality of unit linear motors is used as described above, the output of each unit linear motor can be used as an output for a plurality of units, and a large output can be obtained.

In this invention, you may provide the hole which discharges the slag which arises by press work in the site | part which corresponds to the press drive axial center of the said linear motor for die | dyes. The press drive shaft core is the center of the ram shaft, that is, the center of the punch and die.
Since the die-side linear motor is disposed below the die, there is no problem during the molding process, but in the drilling process, the slag discharge may be obstructed. Therefore, by providing a hole for discharging slag at a portion corresponding to the press drive axis of the die linear motor, it is possible to smoothly discharge slag while using the linear motor for driving the die.

  In particular, when the die linear motor is a unit linear motor assembly in which a plurality of unit linear motors are provided around the press drive shaft center and the output shaft is parallel to the press drive shaft core. It is preferable to provide a hole for discharging the slag generated by the press working at the matching site. When the die linear motor is an assembly of unit linear motors as described above, a configuration in which a slag discharge hole is provided at the center of the press drive shaft can be easily performed.

The linear motor-equipped press machine according to the present invention may include a control unit that presses and lifts both the punch and the die with respect to the workpiece.
When both the punch and the die are driven simultaneously, or when both the punch and the die are sequentially operated for one processing, a variety of workpieces can be processed. Thus, when performing press working by driving both the punch and die up and down, the excellent controllability of the linear motor can be used effectively, and a linear motor is used as the drive source for these punches and dies. The effect of improving the accuracy in the present invention is more effectively exhibited.

  The press working method of the present invention is a method of performing press working by driving the punch and die up and down on a workpiece using the linear motor-equipped press machine having any one of the configurations of the present invention. According to this method, as described above, the accuracy improvement effect in the press machine equipped with the linear motor of the present invention using the linear motors as the punch and die driving sources as described above is more effectively exhibited, and various punching processes are performed. Can be performed with high accuracy. The punching mentioned here refers to punching or forming.

  A press machine equipped with a linear motor according to the present invention is a press machine that presses a workpiece with a punch and a die located on a press drive shaft, and is provided on a press frame having an upper frame and a lower frame, and the upper frame. Since it has a punch linear motor that moves the punch up and down and a die linear motor that moves up and down the die provided on the lower frame, both the punch and die can be driven, enabling a variety of machining. However, a simple configuration can be achieved and high-precision processing can be performed.

  Either one or both of the punch linear motor and the die linear motor is a unit linear motor assembly in which a plurality of unit linear motors whose output shafts are parallel to the press drive shaft core are provided around the press drive shaft core. In the case of a body, it is possible to avoid a difficulty in manufacturing a linear motor and obtain a large output.

  When a hole for discharging the slag generated by pressing is provided in a portion that coincides with the press drive axis of the linear motor for die, the slag generated during drilling is discharged while the die can be driven. Easy to do.

  The die linear motor is a unit linear motor assembly in which a plurality of unit linear motors with the output shaft parallel to the press drive shaft core are provided around the press drive shaft core. When a hole for discharging the slag generated by pressing is provided, a large output can be obtained by avoiding the difficulty in manufacturing the linear motor, and the slag generated during drilling can be easily discharged. It can be done.

  If you have a control means that presses both punches and dies up and down with respect to the workpiece, it is possible to drive both the die and punch to process the workpiece to enable a variety of machining. Can be processed with high accuracy.

  The press working method of the present invention is a method of performing press working by driving both the punch and the die up and down with respect to the work using the press machine equipped with the linear motor of the present invention. Both punches can be driven to enable a variety of processing, and the processing can be performed with high accuracy.

  An embodiment of the present invention will be described with reference to FIGS. This press machine is a punch press that presses a workpiece W of a sheet material such as a sheet metal by means of a punch 61 and a die 62. The press machine is provided on a press frame 41 and an upper frame 41b of the press frame 41. A punch linear motor 1 to be driven and a die linear motor 1A provided on the lower frame 41c to drive the die 62 up and down are provided.

  The press frame 41 is obtained by connecting an upper frame 41b and a lower frame 41c to a column portion 41a, and a side surface shape with an open front surface is a C-shape. A pair of upper and lower tool supports 42 and 43 and a work feed mechanism 44 are installed between the upper and lower frames 41b and 41c, and a press mechanism 45 using the punch linear motor 1 as a drive source is installed on the upper frame 41b. Has been. Note that the press frame 41 may be a so-called gate-type, ring-type, or square-shaped frame in which upper and lower frame portions having the same length are connected by column portions at the front end and the rear end.

  The tool supports 42 and 43 are composed of upper and lower turrets arranged concentrically, and punches 61 and die dies 62 are mounted on the upper and lower tool supports 42 and 43 at a plurality of locations in the circumferential direction, respectively. The punch 61 and the die 62 are indexed at a predetermined punch position P by the rotation of the tool supports 42 and 43.

  In FIG. 1, the workpiece feeding mechanism 44 is configured to grip the edge of a workpiece W made of a plate material with a workpiece holder 47 and move the workpiece W back and forth and right and left on a table 48.

  The press mechanism 45 supports a ram 49 that lifts and lowers the punch die 61 indexed to the punch position P of the tool support 42 by a ram guide 50, and the ram 49 is supported by the output shaft 12 of the linear motor 1. Drive up and down.

  As shown in FIGS. 2 and 3, the punch linear motor 1 includes a plurality of unit linear motors 2 each formed of a cylindrical linear motor and arranged in parallel in a motor case 25. In this example, the cylindrical linear motors 2 having the same specifications are arranged side by side in a circumferential direction on a virtual circle centered on the output shaft center O, that is, the press drive shaft center. ing.

  Each unit linear motor 2 includes a shaft member 3 made of a permanent magnet in which N poles and S poles are alternately arranged, and a coil unit 4 in which the shaft member 3 is relatively movable in the axial direction. The coil unit 4 is configured by arranging a plurality of coils 5 surrounding the shaft member 3 in a cylindrical coil case 7 in the axial direction. The coil unit 4 serves as a stator, and the shaft member 3 serves as an output shaft that is a moving body of the unit linear motor 2. The shaft member 3 is composed of a single round bar-shaped member, but may be a plurality of permanent magnets arranged in the axial direction.

  In the motor case 25, an inner cylinder 26 and an outer cylinder 27 are arranged concentrically, and both ends of the inner cylinder 26 and the outer cylinder 27 are connected by end plates 28 and 29. The unit linear motors 2 are arranged in the circumferential direction in an annular space between the inner cylinder 26 and the outer cylinder 27. The end plates 28 and 29 on both sides respectively have a plurality of shaft member insertion holes 28a and 29a through which the shaft member 3 of each unit linear motor 2 is inserted, and one end plate 28 has a guide shaft insertion hole 28b in the center. Is provided.

  The shaft member 3 of each unit linear motor 2 is connected to each other by plate-like connecting members 10 and 11, and the plurality of shaft members 3 and the connecting members 10 and 11 constitute a moving body 30. An output shaft 12 positioned at the center O of the array of unit linear motors 2 is formed on one connecting member 11 of the moving body 30.

Between the motor case 25 and the moving body 30, a guide mechanism 32 for guiding the movement of the shaft members 3 of the plurality of unit linear motors 2 is provided. The guide mechanism 32 is provided in the center of the inner cylinder 26 of the motor case 25, the bush 15 which is a guide portion fixed in a fitted state in the inner cylinder 26, and the connecting member 10 on one end side. It is comprised with the guide shaft 13 which is a to-be-guided part fitted so that axial movement is possible. The bush 15 constitutes a sliding bearing. Instead of providing the bush 15, a linear motion rolling bearing may be interposed.
The guide mechanism 32 is provided with an anti-rotation means 16 that prevents the motor case 25 from rotating relative to the moving body 30. The detent means 16 includes a key groove 17 provided in the guide shaft 13 along the axial direction, and a key portion 18 that is fixed to the inner cylinder 26 of the motor case 25 and slidably engages with the key 17. .

FIG. 4 shows a linear motor 1A for a die. The die linear motor 1A is provided with a slag discharge hole 70 in the center, and a bush 15A is provided in each unit linear motor 2 instead of the guide mechanism 32 in the punch linear motor 1 of FIGS. Yes. The slag discharge hole 70 is formed by the internal space of the inner cylinder 26 of the motor case 25. The center of the slag discharge hole 70 is a position that coincides with the press drive shaft center that is the center of the punch position P.
The output side connecting member 11 in the die linear motor 1 </ b> A is provided with an output shaft 71 that protrudes upward from a hollow shaft whose inside is a slag discharge hole.
Other configurations of the die linear motor 1A are the same as those of the punch linear motor 1 described with reference to FIGS.

The punch 61 and the die 62 installed on the upper and lower tool supports 42 and 43 in FIG. 1 include the punch 61 ₁ and the die 62 ₁ for drilling shown in FIG. There are a punch 61 ₂ and a die 62 ₂ for forming shown in FIG.
Punch 61 _first hole drilling is fixedly installed via a die holder 63 to the tool carrier 43 of the lower side.

The molding punch 61 ₂ is a concave mold having a concave mold portion 65 on the lower surface, and the molding die 62 ₂ is a convex mold having a convex mold portion 66 on the upper side. Molding die 62 ₂ for the vertically movable is placed against the die holder 63 installed in the tool carrier 43 of the lower, located below the die height DH in lowered position. Die 62 ₂ for molding processing, the output shaft 12A of the die-side linear motor 1A, is pushed above the die height DH.

Molding die 62 ₂ for the output shaft engaging projection 67 on the lower surface is provided, at elevated, the upper end of the output shaft 12A of the die linear motor 1A to the lower surface of the output shaft engaging projection 67 Is pressed. Incidentally die 62 ₂ for molding is biased downward by the return spring (not shown).
A hollow hole 69A for allowing the output shaft 12A of the die-side linear motor 1A to be moved up and down is provided at the installation position of each die 62 of the lower tool support 43 made of a turret. The bolster 68 that receives the tool support 43 is composed of a pair of bolster constituent members, and a space 69B between the two bolster constituent members is a hollow space 69B into which the output shaft 12A of the die side linear motor 1A enters to be movable up and down.

  In FIG. 1, a control device 81 for controlling the press machine is composed of a computer-type numerical control device, which decodes and executes a machining program 82 by an arithmetic control unit 83, and each linear motor 1, 1A, work feed mechanism Commands are given to the servomotors 44 for each axis and the drive source (not shown) for indexing rotation of the tool supports 42 and 43. The control device 81 is provided with a control means 84 that presses and moves both the punch 61 and the die 62 by the linear motors 1 and 1A. The control means 84 is configured by instructions described in the machining program 82 and the arithmetic control unit 83.

The operation of the press machine having the above configuration will be described. As shown in FIG. 5A, the die linear motor 1A is normally in a lowered state, and the upper end of the output shaft 12A is located below the lower surface of the lower tool support 43. Therefore, the tool support 43 made of a turret can be rotated without interfering with the output shaft 12A. Further, as shown in FIG. 5 (B), die 62 ₂ for molding the upper end thereof is positioned lower than the die height DH. In this state, the arbitrary punch 61 and the die 62 are indexed to the punch position P by the rotation of the upper and lower tool supports 42 and 43. Thus, die 62 ₂ for molding can be prevented from scratches in sliding contact with the lower surface of the workpiece W.

  Punching such as normal drilling is performed by driving the punch 61 of the upper tool support 42 downward with the punch linear motor 1 while the die linear motor 1A is lowered as described above. The slag generated by the drilling process falls down the machine through the slag discharge hole 70 provided at the center of the die linear motor 1A.

When performing molding rotates the upper and lower tool carriers 42 and 43, determine 5 the die 62 ₂ for molding as (B) to the punch center P. Accordingly, it positioned die 62 ₂ for molding directly over output shaft 12A of the die linear motor 1A. In this state, as shown in FIG. (C), the linear motor 1A die is driven upward to raise the die 62 ₂ for forming at the output shaft 12A to a predetermined height. Further, the punch 61 ₂ for molding is lowered by the punch linear motor 1 and the workpiece W is sandwiched between the punch 61 ₂ and the die 62 ₂ . Thereby, the forming portion Wa is press-formed on the workpiece W.

  When molding is completed, the punch linear motor 1 is raised and the die linear motor 1A is lowered. Since the forming portion Wa formed by punching in this way protrudes above the workpiece W, it does not become an obstacle when the workpiece W is fed on the table 48 by the workpiece feeding mechanism 44.

  According to the press machine having this configuration, since the linear motor 1 is used as a press drive source, a mechanism for converting the rotation into the linear motion of the ram 49 is not required as compared with a press motor using a rotary motor. The number of parts is small and the configuration is simple. In addition, a hydraulic unit is not required and the configuration is simpler than that using a hydraulic cylinder as a press drive source. Moreover, the linear motor 1 is excellent in positional accuracy, and processing with high processing quality and accuracy is possible.

Further, the die 62 ₂ for molding is also used to lift driven by a linear motor 1A, the conventional horizontal cylinder device and a cam, as compared to those vertically driving the link mechanism or the like, the configuration is simplified, even in controllability It is excellent and can control the lifting stroke of the die 622 with _high accuracy. As described above, since both the punch 61 and the die 62 can be driven to enable a variety of processes, both the punch 61 and the die 62 are driven by using the linear motors 1 and 1A. In addition, high-precision processing can be performed.

  Each of the punch linear motor 1 and the die linear motor 1A includes a unit linear motor assembly in which a plurality of unit linear motors 2 whose output shafts are parallel to the press drive shaft core are provided around the press drive shaft core. Therefore, a large output can be obtained. Punching may require a large thrust, but a linear motor uses a permanent magnet with a strong magnetic force. Therefore, to obtain a large thrust with a single linear motor, the manufacturing limit of the magnet size and the supply voltage Manufacturing is difficult due to the above-mentioned restrictions. However, in this embodiment, since the linear motors 1 and 1A are composed of the assembly of a plurality of unit linear motors 2 as described above, the output of each unit linear motor 2 can be used as a plurality of outputs, resulting in a large output. Can be obtained.

In addition, since the die linear motor 1A is provided with the slag discharge hole 70 for discharging the slag generated by the press processing in a portion corresponding to the press drive shaft core, the slag can be discharged smoothly. while installing the die linear motor 1A in the lower die 61 ₁ for opening, the linear motor 1A die is avoided to be a hindrance of the slag discharge.
Since the die linear motor 1A is an assembly in which a plurality of unit linear motors 2 are provided, a configuration in which the slag discharge hole is provided at the center of the press drive shaft can be easily performed.

  Further, the linear motor-equipped press machine performs press working by driving up and down both the punch 61 and the die 62 as described with reference to FIG. 5C in accordance with the control of the control means 84 of FIG. For this reason, both the punch 61 and the die 62 are driven simultaneously, or both the punch 61 and the die 62 are sequentially operated for processing on a single molding part Wa. Can be processed. As described above, when pressing is performed by driving both the punch 61 and the die 62 up and down, the excellent controllability in each of the linear motors 1 and 1A can be effectively used. As a result, the effect of improving the accuracy due to the use of the linear motors can be effectively exhibited.

In the above embodiment, the punch and die linear motors 1 and 1A are both made up of an assembly of a plurality of unit linear motors 2. However, each unit linear motor 2 is enlarged as a single unit. A type of linear motor may be used.
In this case, the die-side linear motor 1A preferably has a slag discharge hole 70 passing through the center of the shaft member 3, as shown in FIG.

It is a fracture side view of a linear motor loading press machine concerning one embodiment of this invention. It is a longitudinal cross-sectional view of the linear motor for punches in the press machine. It is the III-III sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the die linear motor in the press machine. It is operation | movement explanatory drawing of the press machine. It is a longitudinal cross-sectional view of the modification of the linear motor for dies in the press machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Punch linear motor 1A ... Die linear motor 3 ... Shaft member (output shaft)
4 ... Coil unit 5 ... Coil 7 ... Coil case 10, 11 ... Connecting member 12, 12A ... Output shaft 25 ... Motor case 41 ... Press frame 41b ... Upper frame 41c ... Lower frame 42, 43 ... Tool support 44 ... Work feed mechanism 45 ... press mechanism 49 ... ram 61 ... punch 62 ... die 61 ₁ ... punch 62 for hole formation ₁ ... punching for machining die 61 ₂ ... for molding punch 62 ₂ ... for molding die 63 ... Tool holder 70 ... slag discharge hole 81 ... control device 84 ... control means DH ... die height O ... output shaft center P ... punch position (press drive shaft core)
W ... Work

Claims (6)

  A press machine that presses a workpiece with a punch and a die located on a press drive shaft, a press frame having an upper frame and a lower frame, and a linear motor for punch that is provided on the upper frame and drives the punch up and down And a linear motor-equipped press machine provided with a lower frame and a die linear motor that drives the die up and down.   Either one or both of the punch linear motor and the die linear motor is a unit linear motor assembly in which a plurality of unit linear motors whose output shafts are parallel to the press drive shaft are provided around the press drive shaft. The press machine with a linear motor according to claim 1, wherein the press machine is a body.   The linear motor-equipped press machine according to claim 1 or 2, wherein a hole for discharging a slag generated by pressing is provided in a portion that coincides with a press drive axis of the die linear motor.   The die linear motor is a unit linear motor assembly in which a plurality of unit linear motors whose output shafts are parallel to the drive shaft core are provided around the press drive shaft core. The linear motor-equipped press machine according to claim 1, wherein a hole for discharging slag generated by the press working is provided.   The linear motor-equipped press machine according to any one of claims 1 to 4, further comprising a control unit that presses and lifts both the punch and the die with respect to the workpiece. A press working method in which the linear motor-mounted press machine according to any one of claims 1 to 4 is used to press and lift both a punch and a die on a work.

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