JP2001314919A - Bending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending machine which helps to minimize variations of bending angles by improving accuracy of up and down movements in an upper side clamp beam. SOLUTION: The upper side clamp beam 9 provided with a top die 17 to press-fix a workpiece from the up and down direction cooperating with a bottom die 13 is provided by rocking universally in the up and down direction. The upper side clam beam is rockingly driven in the up and down direction by a crankshaft 23 for clamping which is rotationally driven with a hollow synchronous motor 27 for clamping. The hollow synchronous motor consists of a hollow rotor directly connected with an end of the crankshaft for clamping and a motor housing to support the rotor. The crankshaft for clamping is rotationally driven by the hollow synchronous motor without a reducer directly at a high torque and a low speed. Thus, by controlling the rotational angle accurately, positioning accuracy in the up and down direction of the upper clamp beam is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending machine for bending a work with a bending die while clamping the work with a top die and a bottom die.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 9, a bending machine 201 clamps and fixes a work W by the cooperation of a top die 203 and a bottom die 205, and then moves the work W from the top die 203 and the bottom die 205. The projecting portion of the work W projecting in the direction (rightward direction in FIG. 9) is bent upward or downward.

A bottom die 205 is provided above a lower clamp beam 207 serving as a lower frame of a processing machine main body.
Numeral 3 is provided below the upper clamp beam 211, and the upper clamp beam 211 is provided on the lower clamp beam 207 at the rear side so as to be swingable in the vertical direction with the pivot 209 as a fulcrum.

A ram vertical drive device 213 for clamping and unclamping the work W by the cooperation of the bottom die 205 and the top die 203 is provided on the upper clamp beam 211.
Is provided. The ram vertical drive device 213 includes a clamp crankshaft 21 having an eccentric cam 215.
The upper clamp beam 2 is extended via the crankshaft bracket 219 in a state where the upper clamp beam 7 is extended in the left-right direction in FIG.
11 is mounted above.

The clamping crankshaft 217 is connected to the output shaft of a clamping servomotor 221 provided on the right crankshaft bracket 219 in FIG. Eccentric cam 21
In 5, the upper end of the clamp arm 225 is supported by a pivot 227, and the lower end of the clamp arm 225 is mounted on the lower clamp beam 207 with a swing shaft 229 serving as a swing fulcrum.

Therefore, the clamping servomotor 22
When the motor 1 is driven, the output of the clamping servomotor 221 is greatly reduced by the speed reducer 223, so that the eccentric cam 215 of the clamping crankshaft 217 is rotated at a high torque and a low speed. The rotation of the eccentric cam 215 causes the eccentric cam 215 to rotate about the pivot 227 at the upper end of the clamp arm 225 while the clamp arm 225 swings about the swing shaft 229 as a fulcrum. Upper clamp beam 2 through 219
The top die 203 is vertically moved toward the bottom die 205 so as to press and fix the work.

Further, the top die 203 and the bottom die 2
In a state where the work is pressed and fixed at 05, the work W protrudes rearward from the top die 203 and the bottom die 205.
Mold 23 for bending the upper or lower direction
A bend front-rear drive unit 235 in which a bend beam 233 provided with the first bend moves in the front-rear direction (left-right direction in FIG. 9);
A bend up / down driving device (not shown) for moving the bend beam 233 in a vertical direction (vertical direction in FIG. 9) is provided.

The bend front-rear drive unit 235 transmits the rotational force of the bend front-rear servo motor 237 at a high torque and a low speed via a speed reducer, and the rotational force moves the bend beam 233 in the front-rear direction by a crank mechanism. It is configured as follows.

In the bend up / down driving device, the rotational force of a bend up / down servomotor (not shown) is transmitted at a high torque and a low speed via a speed reducer, and the rotational force moves the bend beam 233 up and down by a crank mechanism. It is configured to move in the direction.

[0010]

By the way, in the conventional bending machine 201, the upper clamp beam 211 is not provided.
Is moved up and down, the servo motor 221 for clamping is used.
Is transmitted to the clamping crankshaft 217 via the speed reducer 223, so that backlash or lost motion is inevitably generated, resulting in a problem that the positioning accuracy of the repetition varies.

That is, when a work W having a small thickness such as 0.35 mm or 0.4 mm is machined, the clearance between the top die 203 and the bottom die 205 is small. In particular, it is necessary to improve the accuracy of this clearance. However, if the rotation angle of the clamp crankshaft 217 fluctuates as described above, the vertical movement position of the upper clamp beam 211 fluctuates. There was a problem of dispersion.

Further, in the front / rear bend drive device 235, since the rotational force of the front / rear bend servo motor 237 is transmitted to the crankshaft via the speed reducer, backlash and lost motion occur.
There is a problem that the positioning accuracy in the front-rear direction varies.

Also, in the bend up / down drive device, since the rotational force of the bend up / down servomotor is transmitted to the crankshaft via the speed reducer, backlash and lost motion occur, so that the bend beam 233 is positioned vertically. There is a problem that the accuracy varies.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide an upper clamp beam having a top die which presses and fixes a work in cooperation with a bottom die attached to a lower clamp beam. A bending machine that can improve bending accuracy by improving the accuracy of vertical movement to reduce the variation in bending angle, and by reducing the variation in positioning of the vertical movement before and after the bend beam that bends the workpiece, and by improving the bending accuracy. Is to do.

[0015]

According to a first aspect of the present invention, there is provided a bending machine comprising: a top die for pressing and fixing a work from above in cooperation with a bottom die provided on a lower frame; A ram equipped with a ram is provided so as to be swingable in the vertical direction, and a ram vertical drive device for moving the ram up and down is provided, and the work is pressed and fixed by the top die and the bottom die. A bend beam provided with a bending mold for bending a work projecting upward or downward is provided so as to be swingable in the vertical direction, and a bend up / down drive device for moving the bend beam up and down is provided. In a bending machine provided with a bend longitudinal drive device, the ram vertical drive device is provided with a crankshaft support provided on the ram. A clamp crankshaft that is rotatably driven by a clamp rotary drive means and is rotatably driven by a clamp rotating shaft; an upper end of which is supported by an eccentric portion of the clamp crankshaft; and a lower end which is rotatably supported by the lower frame as a swing fulcrum. And a clamp arm that swings in the direction of rotation, wherein the rotation driving means for clamping comprises a hollow rotor and a hollow synchronous motor provided with a motor housing for bearing the rotor. .

Therefore, the clamping crankshaft is directly driven to rotate by the high-torque and low-speed rotating hollow synchronous motor, so that there is no backlash or lost motion due to the conventional reduction gear. The rotation angle of the crankshaft is accurately controlled. As a result, the positioning accuracy of the ram in the vertical direction is improved, and the accuracy of the clearance between the top die and the bottom die is improved, so that the variation in the bending angle of the work is reduced.

According to a second aspect of the present invention, there is provided the bending machine according to the first aspect, wherein the clamping crankshaft and the rotor of the hollow synchronous motor are integrally provided. Is what you do.

Therefore, since the crankshaft for clamping is used as the rotor of the hollow synchronous motor, the number of parts of the hollow synchronous motor is small and the structure is simple, so that the assembly is easy and inexpensive.

According to a third aspect of the present invention, there is provided a bending machine in which a ram provided with a top die which presses and fixes a work from above in cooperation with a bottom die provided on a lower frame is provided so as to be vertically swingable. A ram vertical drive device for moving the ram up and down is provided, and in a state in which the work is pressed and fixed by the top die and the bottom die, the work projecting rearward from the top die and the bottom die is bent upward or downward. A bending machine provided with a bend beam provided with a mold so as to be swingable in the vertical direction, a bend up / down drive device for moving the bend beam up and down, and a bend front / rear drive device for moving the bend beam back and forth. In the above, the bend vertical drive device,
A bend up / down crankshaft that is rotatably driven by a bend up / down rotation drive means and is supported by the lower frame, one end of which is supported by an eccentric portion of the bend up / down crankshaft, and the other end of which is connected to the bend beam; A vertical movement arm, wherein the bend up / down rotation drive means comprises a hollow rotor and a hollow synchronous motor provided with a motor housing for bearing the rotor.

Therefore, the bend up / down crankshaft is
It is directly driven by a hollow synchronous motor that rotates at high torque and at low speed without a conventional speed reducer, so there is no backlash or lost motion caused by the speed reducer. The rotation angle of the crankshaft is accurately controlled. As a result, the positioning accuracy in the vertical direction of the upper and lower bending dies forming the bending die holder that constitutes the bend beam is improved, so that the variation in the bending angle of the workpiece is reduced, and the product is reduced. The quality is improved.

According to a fourth aspect of the present invention, in the bending machine according to the third aspect, the bend vertical crankshaft and the rotor of the hollow synchronous motor are integrally provided. It is assumed that.

Therefore, since the bend up / down crankshaft is used as the rotor of the hollow synchronous motor, the number of parts of the hollow synchronous motor is small, and the structure is simple, so that the assembly is easy and inexpensive.

According to a fifth aspect of the present invention, there is provided a bending machine in which a ram provided with a top die which presses and fixes a work from above in cooperation with a bottom die provided on a lower frame is swingably provided in a vertical direction. A ram vertical drive device for moving the ram up and down is provided, and in a state in which the work is pressed and fixed by the top die and the bottom die, the work projecting rearward from the top die and the bottom die is bent upward or downward. A bend beam provided with a mold is provided so as to be swingable in the up-down direction and the front-rear direction, a bend up-down drive device for moving the bend beam up and down, and a bend front-rear drive device for moving the bend beam back and forth are provided. In the bending machine, the bend front-rear drive unit is supported by the lower frame, and the bend front-rear rotation drive unit is used. A bend front and rear crankshaft to be rolled, and a front and rear movement arm having one end supported by an eccentric portion of the bend front and rear crankshaft and the other end connected to the bend beam. The means comprises a hollow rotor and a hollow synchronous motor having a motor housing for bearing the rotor.

Therefore, since the front and rear bend crankshafts are directly rotated by the hollow synchronous motor that rotates at a high torque and at a low speed, there is no occurrence of backlash or lost motion due to the conventional reduction gear. The rotation angle of the front and rear crankshafts is accurately controlled. As a result, the positioning accuracy in the front-rear direction of the front-rear movement arm is improved, and the positioning accuracy in the front-rear direction of the bending dies, which are the upper bending dies and the lower bending dies, which constitute the bend beam, is improved. This contributes to improving the bending angle of the workpiece.

According to a sixth aspect of the present invention, in the bending machine according to the fifth aspect, the bend front-rear crank shaft and the hollow synchronous motor rotor are integrally provided. It is assumed that.

Accordingly, since the front and rear bend crankshafts are used as the rotor of the hollow synchronous motor, the number of parts of the hollow synchronous motor is small and the structure is simple, so that the assembly is easy and the cost is low.

In the bending machine according to the present invention, a ram provided with a top die which presses and fixes a work from above in cooperation with a bottom die provided on a lower frame is provided so as to be vertically swingable. A ram vertical drive device for moving the ram up and down is provided, and in a state in which the work is pressed and fixed by the top die and the bottom die, the work projecting rearward from the top die and the bottom die is bent upward or downward. In a bending machine provided with a bend beam provided with a mold so as to be swingable in the vertical direction, a bend vertical drive device for moving the bend beam up and down, and a bend longitudinal drive device for moving the bend beam back and forth. The ram vertical drive device is supported by a crankshaft support member provided on the ram, and serves as a clamping rotary drive unit. A clamp crankshaft that is driven to rotate, and a clamp arm that has an upper end supported by an eccentric portion of the clamp crankshaft and a lower end that is supported by the lower frame as a swing fulcrum and swings vertically. A bend up / down driving device, the bend up / down crankshaft rotatably driven by a bend up / down rotation drive means being supported by the lower frame, and one end supported by an eccentric portion of the bend up / down crankshaft; A vertical movement arm connected to the bend beam, wherein the bend longitudinal drive device is supported by the lower frame and is rotationally driven by bend longitudinal rotational drive means; and a bend longitudinal crank shaft. A front-rear movement arm having one end supported by an eccentric portion of the front and rear crankshaft and the other end connected to the bend beam. At least any two of the rotation driving means for clamping, the rotation driving means for vertical movement of the bend, and the rotation driving means for longitudinal movement of the bend are hollow rotors having a hollow rotor and a motor housing for bearing the rotor. And a synchronous motor.

Therefore, at least any two of the clamping crankshaft, the bend up / down crankshaft, and the bend front / back crankshaft are directly driven to rotate by the hollow synchronous motor rotating at high torque and at low speed. Therefore, the backlash and the lost motion due to the conventional speed reducer do not occur, so that the rotation angles of the respective crankshafts are accurately controlled. as a result,
Comprehensively, the bending machine aims to improve the quality of the bending angle of the work.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bending machine according to the present invention will be described below with reference to the drawings.

Referring to FIGS. 2 and 3, the bending machine 1 according to the embodiment of the present invention is provided with, for example, a lower clamp beam 3 as a lower frame of the machine body. For example, an upper clamp beam 9 as a ram is provided on a support bracket 5 integrally provided at an upper portion on the rear side of the lower clamp beam 3 with a pivot 7 as a fulcrum so as to be swingable in the vertical direction (Z-axis direction) in FIG. Have been.

A lower front plate 11 is defined at a front portion (left portion in FIG. 2) of the lower clamp beam 3. A fixed metal extending in the X-axis direction in FIG. 2 is provided on an upper surface of the lower front plate 11. For example, a bottom die 13 is provided as a mold. An upper front plate 15 is fixed to a front portion of the upper clamp beam 9, and a bottom die 13 is fixed to a lower portion of the upper front plate 15.
For example, a replaceable top die 17 is provided as a movable mold opposite to the above. At a substantially central portion of the top die 17, a mold changing unit (not shown) is provided.

On the upper clamp beam 9 above the upper front plate 15, a ram vertical drive device 19 for clamping and unclamping the work in cooperation with the bottom die 13 and the top die 17 is provided.

In the ram vertical drive device 19, a clamp crankshaft 23 having an eccentric cam 21 as an eccentric part is extended in the X-axis direction in FIG. For example, it is mounted on the upper clamp beam 9 via a crankshaft bracket 25.

The clamp crankshaft 23 is configured to be directly connected to, for example, a hollow synchronous motor 27 for clamping as a rotational driving means for clamping provided on the side surface of the bracket 25 for the right crankshaft in FIG. Have been. The hollow synchronous motor for clamping 27 constitutes a main part of the embodiment of the present invention, and has a high torque.
Since a low-speed rotation is generated, a conventional speed reducer is not required.

Referring to FIG. 1, the crankshaft 23 for clamping is supported on a bracket 25 for crankshaft by a bearing part 31 composed of two bearings 29, and is fastened by a screw part 35 by a first mounting bracket 33. Is attached. The right end of the clamp crankshaft 23 in FIG. 1 protrudes rightward from the side surface of the crankshaft bracket 25.

The hollow synchronous motor 27 for clamping has a direct drive motor section 39 for actually rotating the crankshaft 23 for clamping in a motor housing 37, and the right side of the bracket 25 for crankshaft via the motor housing 37. It is attached to the surface with bolts BT.

It should be noted that the hollow synchronous motor 27 for clamping is
An armature core coil portion 41 is provided in the direct drive motor portion 39, and the rotor 4 is provided inside the coil portion 41.
3. The permanent magnets (N, S) are housed, and the rotor 43 is rotatable. A shaft hole 4 having a keyway 45 is provided in the rotor 43.
The right end of the clamping crankshaft 23 is fitted into the shaft hole 47 and attached via a key 49.

More specifically, the cylindrical member 51 of the direct drive motor portion 39 forms a main portion of the motor housing 37 having a hollow portion 53 with an opening, and a cylindrical rotor 43 is provided in the hollow portion 53. Is rotatably provided on the cylindrical member 51 via the first bearing 55 and the second bearing 57.

Further, on the inner periphery of the cylindrical member 51 of the direct drive motor section 39, a coil section 41 for generating a magnetic field is integrally provided. Further, a magnet portion 59 is provided integrally with the outer peripheral surface of the rotor 43 at a position of the rotor 43 opposed to the inside of the coil portion 41 with a gap therebetween.

The coil portion 41 is formed by winding a plurality of coils 61 of different phases. On the other hand, the magnet portion 59 is provided with a large number of N and S permanent magnets alternately arranged at intervals facing the respective coils 61.

As described above, the rotor 43 and the permanent magnets (N, S) described above are housed inside the coil portion 41.

With the above configuration, when a drive electric signal (pulse) is sequentially applied to the plurality of out-of-phase coils 61 of the coil portion 41 of the direct drive motor portion 39 of the motor housing 37 with good timing, the plurality of out-of-phase coils 61 are applied. Since an electric field is sequentially generated between the motor 43 and a large number of permanent magnets, the magnet portion 59 acts to rotate the rotor 43, and the rotor 43 is adjusted to high torque and low speed rotation in the hollow portion 53 of the motor housing 37. It becomes possible. The rotation of the rotor 43 can be reversed by reversing the order of the pulses applied to the plurality of coils 61 having different phases.

The rotor 43 is integrally formed with the clamping crankshaft 23 in that the rotor 43 is formed integrally with the clamping crankshaft 23 in order to provide an easy-to-assemble and inexpensive hollow synchronous motor 27 by reducing the number of parts and providing a simple structure. It does not matter.

With the above configuration, the clamping crankshaft 2
The eccentric cam 21 for clamping is rotated on a substantially vertical plane by the rotation of 3 by the hollow synchronous motor 27 for clamping.

Referring to FIG. 2 to FIG. 4, the upper end of the clamp arm 63 (also referred to as "boomerang") is supported by the pivot 65 on the eccentric cam 21 for clamping, and the lower end of the clamp arm 63 is connected to the lower front plate. 11 is mounted with, for example, a swing shaft 67 as a swing fulcrum.

With the above configuration, when the clamp hollow synchronous motor 27 is driven, the clamp eccentric cam 21 of the clamp crank shaft 23 is rotated via the gear mechanism. The rotation of the clamp eccentric cam 21 causes the clamp arm 63 to swing about the swing shaft 67 as a fulcrum.

For example, when the clamp crankshaft 23 rotates clockwise in FIGS. 2 and 5A, the clamp eccentric cam 21 rotates clockwise.
While the clamp arm 63 is swung to the right as shown by a two-dot chain line in FIG. 5B and a solid line, the eccentric cam 21 for clamping is actually turned on the pivot 65 of the clamp arm 63.
Will be rotated clockwise around. Therefore, the clamp crank shaft 23 is
3 rotates clockwise around the pivot 65, so that the upper clamp beam 9 is swung upward about the pivot 65 via the crankshaft bracket 25 to raise the upper front plate 15, so that the top front plate 15 is raised. The die 17 will be raised.

Referring to FIG. 5C, the bottom die 13
After the workpiece W is placed on the crankshaft 2 for clamping,
3 rotates counterclockwise, the clamp eccentric cam 21 rotates counterclockwise, so that the clamp arm 63 is actually swung to the left in FIG. Is rotated counterclockwise around the pivot 65 of the clamp arm 63, and the upper front plate 15 is lowered.
Is lowered, and the work W is sandwiched between the work W and the bottom die 13.

Referring to FIG. 5D, when the clamp crankshaft 23 is further rotated in the counterclockwise direction, the clamp arm 63 itself is extended by the thickness of the work W to generate a clamping force. become. Therefore, the work W placed on the bottom die 13 is pressed and fixed by the cooperation of the bottom die 13 and the top die 17.

As described above, the clamp crankshaft 23
Is directly driven by the hollow synchronous motor for clamping 27 at a high torque and a low speed without a speed reducer, so that there is no backlash or lost motion caused by the conventional speed reducer. The rotation angle of 23 is accurately controlled. Therefore, since the positioning accuracy of the upper clamp beam 9 in the vertical direction is improved, the accuracy of the clearance between the top die 17 and the bottom die 13 is improved, and the variation in the bending angle of the work W is reduced.

Referring to FIGS. 2 and 3, the bend front-rear drive device is, for example, a horizontal drive as a bend front-rear crankshaft having an eccentric portion provided on a support bracket 5 integrated on the lower clamp beam 3. The horizontal eccentric shaft 69 is operatively connected to, for example, a bend front and rear hollow synchronous motor 71 as a front and rear bend rotation drive unit.
The front and rear bend hollow synchronous motor 71 constitutes a main part of another embodiment of the present invention, and can generate high torque and low speed rotation, so that a conventional speed reducer is not required.

Referring to FIG. 7, an eccentric shaft 69 for horizontal drive is supported on a support bracket 5 constituting a part of the lower frame via a bearing 73, and the eccentric shaft 69 for horizontal drive is shown in FIG. , The left end side protrudes leftward from the left side surface of the support bracket 5. A hollow synchronous motor 71 for front and rear bend is attached to a side surface of the support bracket 5 via a motor housing 37 by a fixing tool such as a bolt BT, and is used for horizontal driving in a shaft hole 47 of a rotor 43 of the hollow synchronous motor 71 for front and rear bend. The protruding end of the eccentric shaft 69 is mounted.

The hollow synchronous motor 71 for before and after the bend is used.
Has substantially the same structure and operation as the hollow synchronous motor for clamping 27, and therefore the same members are denoted by the same reference numerals and detailed description thereof will be omitted. In addition, the rotor 4 can be easily assembled with a simple structure by reducing the number of parts, thereby providing an inexpensive hollow synchronous motor 71 for front and rear bends.
3 may be integrally formed with the eccentric shaft 69 for horizontal driving as a crank shaft for front and rear bend.

Referring again to FIG. 2 and FIG. 3, for example, a plurality of transmission links 75 as a longitudinal movement arm are provided via a horizontal drive eccentric shaft 69 so as to be swingable in the longitudinal direction (Y-axis direction). A rear end of the bend beam 77 is connected to a front end of the plurality of transmission links 75 via a connection pin 79, and the connection pin 79 is horizontally movable on the upper surface of the lower clamp beam 3. It is supported by a pin bracket 81.

On the left side of the above-mentioned bend beam 77 in FIG. 3, a bending die holder 83 which is a part of the bend beam 77 extending in the X-axis direction is attached via a guide member 85 so as to be able to move up and down. . The bending die holder 83 is provided with an upper bending die 87 for bending the projecting portion of the work W upward and a lower bending die 89 for bending the projecting portion of the work W downward. . In addition,
The upper bending die 87 and the lower bending die 89 are extended in the X-axis direction.

As a bend vertical drive device for swinging the bending die holder 83 in the vertical direction (Z-axis direction), the lower clamp beam 3 is provided with an eccentric portion, for example, an eccentric cam 91 for bend. The crankshaft 93 is configured to be rotationally driven by, for example, a bend up / down hollow synchronous motor 95 as a bend up / down rotation drive unit. As shown in FIGS. A lower end of a vertically moving arm 97 provided at a lower portion is supported by an eccentric cam 91 for bend.

Referring to FIGS. 3 and 8, a driven gear 99 is provided at the shaft end of the bend up-and-down crankshaft 93, and a driving gear 101 meshing with the driven gear 99 is attached to the lower clamp beam 3. The drive shaft 103 is mounted on a shaft, and an end of the drive shaft 103 is connected to a hollow synchronous motor 95 for vertical movement of the bend. The hollow synchronous motor 95 for up and down bends constitutes a main part of another embodiment of the present invention, and can generate high torque and low speed rotation, so that a conventional speed reducer is not required.

Referring to FIG. 8, the drive shaft 103 is mounted on the lower clamp beam 3 as a lower frame via a bearing 105, and the drive gear 101 is mounted on the right end side of the drive shaft 103 in FIG. A bend up / down hollow synchronous motor 95 is connected to the left end side of the drive shaft 103.

The hollow synchronous motor 95 for vertical movement of the bend is mounted on the side surface of the lower clamp beam 3 via a motor housing 37 by a fixing tool such as a bolt BT. A projecting end of a bend up / down crankshaft 93 is attached to 47.

The hollow synchronous motor 95 for up and down bends
Has substantially the same structure and operation as the hollow synchronous motor for clamping 27, and therefore the same members are denoted by the same reference numerals and detailed description thereof will be omitted. Further, the rotor 4 can be easily assembled and provided at a low cost by providing a simple and inexpensive bend-up / down hollow synchronous motor 95 by reducing the number of parts.
3 may be integrally formed with the bend up / down crankshaft 93.

The above-described bend up / down hollow synchronous motor 95 includes a driven gear 99, a drive gear 101, and a drive shaft 103.
The bend up / down hollow synchronous motor 95 may be directly connected to the bend up / down crankshaft 93.

With the above structure, when the bend up / down crank shaft 93 is driven to rotate by the bend up / down hollow synchronous motor 95, the bending die holder 83 swings upward and the tip of the upper bending die 87 is bent. The height position is set substantially equal to the height position of the upper surface of the bottom die 13. In addition, the work W is positioned at a predetermined position on the bottom die 13, and the clamp synchronous shaft 27 is appropriately operated to rotationally drive the clamp crank shaft 23, thereby clamping and fixing the work W.

Under the state where the work W is fixed by the clamping pressure,
The eccentric shaft 69 for horizontal drive is rotationally driven by the hollow synchronous motor 71 for front and rear bend, and the plurality of transmission links 75 are oscillated in the front-rear direction (Y-axis direction) via the eccentric shaft 69 for horizontal drive and are used for up and down bending When the hollow synchronous motor 95 is appropriately operated and the bending die holder 83 and the upper bending die 87 are further swung upward, the protruding portion of the work W that protrudes rearward from the top die 17 and the bottom die 13. Is bent upward.

When the projecting portion of the work W is bent downward, the clearance between the downward bending die 89 and the bottom die 13 is adjusted, and the bend vertical crank shaft 93 is rotated by the bend vertical hollow synchronous motor 95. The bending mold holder 83 swings downward, and the lower bending mold 89 swings downward and is bent.

As described above, since the horizontal drive eccentric shaft 69 is directly driven to rotate at a high torque and a low speed by the hollow synchronous motor 71 for front and rear bends without a speed reducer,
Since backlash and lost motion due to the conventional reduction gear do not occur, the eccentric shaft 69 for horizontal drive is used.
Is accurately controlled. Therefore, since the positioning accuracy of the transmission link 75 in the front-rear direction is improved, the positioning accuracy in the front-rear direction of the upper and lower bending dies 87 of the bending die holder 83 constituting the bend beam 77 is good. This contributes to the improvement of the quality of the bending angle of the work W.

The bend up / down crankshaft 93 is directly driven to rotate by the bend up / down hollow synchronous motor 95 that rotates at a high torque and at a low speed without using a conventional speed reducer. Since there is no occurrence of backlash or lost motion due to the reduction gear, the rotation angle of the bend up / down crankshaft 93 is accurately controlled. Since the positioning accuracy in the vertical direction of the upper and lower bending dies 87 and 89 of the bending die holder 83 constituting the bend beam 77 is improved, the variation in the bending angle of the workpiece W is reduced, and the product is manufactured. The quality is improved.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes.

[0068]

As can be understood from the above description of the embodiment of the invention, according to the first aspect of the invention, the clamping crankshaft is directly driven to rotate by the hollow synchronous motor. There is no backlash or lost motion caused by such a speed reducer. Therefore, since the rotation angle of the clamping crankshaft can be controlled with high accuracy, the positioning accuracy of the ram in the vertical direction can be improved. As a result, the accuracy of the clearance between the top die and the bottom die can be improved, and the variation in the bending angle of the work can be reduced.

According to the second aspect of the present invention, the number of parts of the hollow synchronous motor is reduced by using the clamp crankshaft as the rotor of the hollow synchronous motor, and the structure is simple, so that the assembly is easy and inexpensive.

According to the third aspect of the present invention, since the bend up / down crankshaft is driven to rotate by the hollow synchronous motor without the interposition of the conventional speed reducer, backlash and lost motion due to the speed reducer occur. Nothing.
Therefore, since the rotation angle of the bend vertical crankshaft can be controlled with high accuracy, the vertical positioning accuracy of the upper and lower bending dies of the bending die holder constituting the bend beam can be improved. . As a result, variations in the bending angle of the work can be reduced, and the quality of the product can be improved.

According to the fourth aspect of the present invention, the use of the bend up / down crankshaft as the rotor of the hollow synchronous motor reduces the number of parts of the hollow synchronous motor and has a simple structure, so that assembly is easy and inexpensive. .

According to the fifth aspect of the present invention, since the front and rear bend crankshafts are directly driven to rotate by the hollow synchronous motor, backlash and lost motion due to the conventional speed reducer do not occur. Therefore,
Since the rotation angle of the bend front and rear crankshafts can be controlled with high accuracy, the positioning accuracy of the front and rear moving arms in the front and rear direction can be improved. As a result, the positional accuracy in the front-rear direction of the bending dies, which are the upper bending die and the lower bending die, which constitute the bend beam, is improved, so that the quality of the bending angle of the work can be improved. .

According to the sixth aspect of the present invention, since the front and rear bend crankshafts are used as the rotor of the hollow synchronous motor, the number of parts of the hollow synchronous motor is reduced and the structure is simple, so that the assembly is easy and inexpensive. .

According to the seventh aspect of the invention, at least any two of the clamp crankshaft, the bend up / down crankshaft, and the bend front / rear crankshaft,
Since it is directly driven to rotate by the hollow synchronous motor rotating at high torque and low speed, there is no occurrence of backlash or lost motion due to the conventional speed reducer.
Therefore, since the rotation angle of each crankshaft can be controlled with high accuracy, it is possible to provide a bending machine capable of improving the bending angle of the work in a comprehensive manner.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a front view including a cross section of a main part of a hollow synchronous motor for clamping.

FIG. 2, showing an embodiment of the present invention, is a perspective view from the front side of a bending machine.

FIG. 3, showing an embodiment of the present invention, is a perspective view from the back side of a bending machine.

FIG. 4 is a schematic right side view of the bending machine of FIG. 2;

FIGS. 5A to 5D are explanatory views of the operation of a ram vertical drive mechanism in the bending machine.

FIG. 6 is a schematic left side view partially showing a bending machine;

FIG. 7 shows another embodiment of the present invention and is a front view including a cross section of a main part of a hollow synchronous motor for front and rear bend.

FIG. 8 shows another embodiment of the present invention, and is a front view including a cross section of a main part of a hollow synchronous motor for vertically moving a bend.

FIG. 9 is a side view of a conventional bending machine.

FIG. 10 is a partial front view taken in the direction of arrow X in FIG. 9;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bending machine 3 Lower clamp beam (lower frame) 5 Support bracket 9 Upper clamp beam (ram) 13 Bottom die 17 Top die 19 Ram vertical drive device 21 Eccentric cam for clamp (Crank shaft 23 for clamp)
23) Crankshaft for Clamping 25 Bracket for Crankshaft (Crankshaft Supporting Member) 27 Hollow Synchronous Motor for Clamping (Rotation Driving Means for Clamping) 37 Motor Housing 43 Rotor 51 Cylindrical Member 53 Hollow Section 59 Magnet Section 61 Coil 63 Clamp Arm 65 Pivot 67 Swing Axis 69 Eccentric Axis for Horizontal Drive (Crank Shaft for Front and Back Bend) 71 Synchronous Motor for Front and Back Bend (Rotary Driving Means for Front and Back Bend) 75 Transmission Link (Forward and Backward Movement Arm) 77 Bend Beam 83 Bending Mold holder 91 Bend eccentric cam 93 Bend up / down crankshaft 95 Bend up / down hollow synchronous motor (bend up / down rotation drive means) 97 Vertical movement arm 103 Drive shaft

Claims (7)

[Claims] 1. A ram vertical driving device for vertically movably providing a ram provided with a top die for pressing and fixing a work from above in cooperation with a bottom die provided on a lower frame and for moving the ram up and down. In the state where the work is pressed and fixed by the top die and the bottom die, the top die and the bend beam provided with a bending die for bending a work projecting rearward from the bottom die upward or downward in the vertical direction. A bending machine provided with a bend up / down drive device for swingably moving and moving the bend beam up and down, and a bend front / rear drive device for moving the bend beam back and forth, wherein the ram up / down drive device is mounted on the ram. Clamping crankshaft which is rotatably driven by a clamping rotary drive means while being supported by a crankshaft supporting member provided A clamp arm having an upper end supported by an eccentric portion of the clamp crankshaft and a lower end supported by the lower frame as a swing fulcrum and swinging vertically. And a hollow synchronous motor including a motor housing for supporting the rotor. 2. The bending machine according to claim 1, wherein the clamping crankshaft and the rotor of the hollow synchronous motor are integrally provided. 3. A ram vertical drive device which is provided with a ram provided with a top die which presses and fixes a work from above in cooperation with a bottom die provided on a lower frame so as to be able to swing up and down, and which moves the ram up and down. In the state where the work is pressed and fixed by the top die and the bottom die, the top die and the bend beam provided with a bending die for bending a work projecting rearward from the bottom die upward or downward in the vertical direction. A bending machine provided with a bend up / down drive device for vertically moving the bend beam and a bend up / down drive device for moving the bend beam back and forth, wherein the bend up / down drive device is provided in the lower part. A bend up / down crankshaft which is rotatably driven by a bend up / down rotation drive means and is supported by a frame; A vertical movement arm journalled to and the other one end to the eccentric portion of the upper and lower crank shaft coupled to the bend beam, consists, rotary drive means for said bending vertically, a hollow rotor,
And a hollow synchronous motor having a motor housing for bearing the rotor. 4. The bending machine according to claim 3, wherein the bend vertical crankshaft and a rotor of the hollow synchronous motor are provided integrally. 5. A ram up / down drive device which is provided with a ram provided with a top die which presses and fixes a work from above in cooperation with a bottom die provided on a lower frame so as to be vertically swingable and which moves the ram up and down. In the state where the work is pressed and fixed by the top die and the bottom die, the top die and the bend beam provided with a bending die that bends the work projecting rearward from the bottom die upward or downward, and A bending machine provided with a bend vertical drive device for vertically moving the bend beam and a bend vertical drive device for vertically moving the bend beam, wherein the bending front and rear drive device is provided so as to be swingable in the front and rear direction. A bend front-rear crankshaft that is rotatably driven by the bend front-rear rotation drive means and is supported by the lower frame. A forward-rearward movement arm journalled to and the other one end to the eccentric portion of the forward-rearward bend crankshaft coupled to the bend beam, consists, rotary drive means for said bending back and forth, a hollow rotor,
And a hollow synchronous motor having a motor housing for bearing the rotor. 6. The bending machine according to claim 5, wherein the front and rear bend crankshafts and the rotor of the hollow synchronous motor are integrally provided. 7. A ram up / down drive device which is provided with a ram provided with a top die which presses and fixes a work from above in cooperation with a bottom die provided on a lower frame so as to be vertically swingable and which moves the ram up and down. In the state where the work is pressed and fixed by the top die and the bottom die, the top die and the bend beam provided with a bending die for bending a work projecting rearward from the bottom die upward or downward in the vertical direction. A bending machine provided with a bend up / down drive device for swingably moving and moving the bend beam up and down, and a bend front / rear drive device for moving the bend beam back and forth, wherein the ram up / down drive device is mounted on the ram. Clamping crankshaft which is rotatably driven by a clamping rotary drive means while being supported by a crankshaft supporting member provided A clamp arm having an upper end supported by an eccentric portion of the clamp crankshaft and a lower end supported by the lower frame as a swing fulcrum and swinging vertically. A bend up / down crankshaft that is rotatably driven by a bend up / down rotation drive means and is supported by a frame; and a vertical movement having one end supported by an eccentric portion of the bend up / down crankshaft and the other end connected to the bend beam. An arm, wherein the bend front-rear drive unit is supported by the lower frame and is rotationally driven by a bend front-rear rotation drive unit; and one end of the eccentric part of the bend front-rear crank shaft. A fore-and-aft movement arm which is journalled and the other end of which is connected to the bend beam; Lower rotary drive means, at least any two of the bend front and rear rotary drive means is a hollow rotor,
And a hollow synchronous motor having a motor housing for bearing the rotor.