JP5580656B2 - Feed device for press machine and press machine with feed device using the same - Google Patents

Description

  The present invention relates to a feed device used in a press machine and a press machine with a feed device using the same. More specifically, the present invention relates to a feed device of a press machine that performs pitch conveyance between dies of a transfer press or between adjacent press machines in a tandem press line, and a press machine with a feed device using the same.

  In recent years, with the development of control technology, it has become mainstream to use a servo motor as a feed device of a press machine. At the same time, there is a growing need to change the drive of a feed device of an existing press machine to a drive by a servo motor. However, when converting the drive of a feed device such as an existing transfer press to a servo motor drive, the overall style of the press machine, such as the structure, structure or shape of the press machine, changes in shape due to the difference in model year. Etc. becomes a problem. Therefore, there is a need for a small-sized feed device that can be easily attached to various press machines.

  In addition, when a servo motor is used for a feed device of a press machine, there is a possibility that an unexpected accident may occur in which the servo motor runs away due to a servo control abnormality and damages the machine. In the event of a major accident, restoration work will be time consuming and production plans may need to be changed. In particular, if an unexpected accident occurs in the advance-return shaft system having a large moving mass and a high moving speed, there is a high possibility that it will lead to a major accident.

  Patent Document 1 describes a feed device for a feed bar. In this system, two pinions are rotated in the same direction by a servo motor, a rack member engaged with the pinions is moved, and a feed bar connected to the rack member is moved back and forth. This is characterized in that the rack member is engaged with one pinion when reaching the movement limit and is not engaged with the other pinion, so that the rack member can be shortened and space can be saved.

  Patent Document 2 describes a transfer device for a press machine. In the transfer device of the press machine, a feed bar is clamped / unclamped and lifted down via a rack-pinion mechanism by driving a servo motor.

  Patent Document 3 describes a transfer device. In this case, the feed bar is moved back and forth by a servo motor. Patent Document 4 describes a work transfer device for a press machine. In this system, the feed bar is moved back and forth by a linear motor. Further, Patent Document 5 describes an advance / return device used in a transfer press. This also includes a mechanism for moving the feed bar back and forth by a servo motor.

JP-A-6-238373 JP-A-6-31358 JP 2001-252733 A JP 2006-21235 A JP-A-6-63668

  The feed device disclosed in Patent Document 1 converts a reciprocating rotation of a servo motor into a reciprocating linear motion of a feed bar by a pinion rack mechanism. Further, this does not include a speed reducer, and if the servomotor runs away due to an abnormality, the feed bar may move (overrun) beyond a predetermined range.

  The transfer device of the press machine of Patent Document 2 uses a pinion rack mechanism for moving the feed bar in the clamping / unclamping direction. This is also not equipped with a reduction gear, and if the servomotor runs away due to an abnormality, the feed bar may overrun.

  Furthermore, the devices described in Patent Documents 3 to 5 also use a servomotor, and if the servomotor runs away due to an abnormality, the feed bar may overrun. In the above Patent Documents 1 to 5, if the motor runs away due to malfunction, the feed bar, finger, and workpiece, which are members (moving bodies) downstream from the rotor of the servo motor, will overrun, resulting in large kinetic energy. It is difficult to stop with a simple structure and a short braking distance.

  Therefore, an object of the present invention is to provide a device that reduces the overrun of the feed bar with a small and simple configuration.

The feed device (Claim 1) used in the press machine of the present invention is a feed device of a press machine that transports a workpiece to be pressed between dies in the press machine or between presses to which a die is attached. A feed bar that moves within a predetermined range for transporting an object to be transported between the molds, a fixed portion that is fixed to a frame member and has at least two brake shoes facing each other, and moves together with the feed bar. A brake plate, and the fixing portion includes a biasing member that biases the brake shoe in a direction in which the brake shoe approaches, and when the feed bar moves beyond a predetermined range, the brake plate What can push between the two brake shoes against the biasing force, a brake shoe particularly Ru good to move while being sandwiched between them It is characterized by stopping the feed bar by the frictional force generated between the rake plate.

  In such a feed device of a press machine, the brake plate includes a main body portion and a tapered portion whose thickness is gradually reduced toward the tips formed at both ends of the main body portion. It is arranged with a gap, and the gap has a width equal to or less than the thickness of the main body of the brake plate, and widens to the same width as the thickness of the main body by pushing against the biasing member. (Claim 2).

  Further, the apparatus further includes a pinion whose rotation is transmitted by the servo motor, and a rack that converts the rotational motion of the pinion into a linear motion, and the rack meshes with the pinion within a predetermined movement range of the feed bar, and feeds It is preferable that the bar has the number of teeth disengaged from the pinion when the bar moves beyond the moving range (Claim 3).

  In addition, the number of the brake shoes is two, the fixing portion includes shaft bolts extending in the moving direction of the two brake shoes, the urging members are disposed at both ends of the shaft bolt, and two brake shoes are provided. It is preferable that the shoes are urged in a direction in which the shoes approach each other. The shaft bolt may pass through the brake shoe or may pass through a plate-like member that supports the brake shoe.

  Furthermore, the press machine according to the present invention and the feed device for a press machine described in any of the above-described ones installed in the press machine are characterized in that it is characterized in that

  In the feed device of the press machine according to the present invention, when the feed bar overruns, the brake plate opposes the urging force of the urging member, pushes the brake shoe and enters between the two brake shoes. Come on. At that time, a frictional force is generated between the brake plate and the brake shoe, and the kinetic energy of the feed bar is converted into heat energy by the frictional force, so that the feed bar can be stopped urgently. In addition, since the feed bar is braked (braking) by holding the brake plate between the brake shoes, it does not stop with an impact such as hitting the stopper. For this reason, the feed bar can be stopped safely and softly, and since there is no damage to the apparatus, restarting after an emergency stop is easy.

  In such a press machine feed device, the brake plate includes a main body portion and a tapered portion whose thickness is gradually reduced toward the tip formed at both ends of the main body portion. When the gap is arranged with a gap, and the gap has a width equal to or less than the thickness of the main body of the brake plate and spreads to the same width as the thickness of the main body by pushing against the biasing member. (Claim 2) In the event of an overrun, the brake plate can be securely held by the gap between the two brake shoes.

  Further, the apparatus further includes a pinion whose rotation is transmitted by the servo motor, and a rack that converts the rotational motion of the pinion into a linear motion, and the rack meshes with the pinion within a predetermined movement range of the feed bar, and feeds If the bar has a number of teeth that disengages from the pinion when the bar moves beyond the moving range (Claim 3), the pinion and the rack are engaged when the feed bar exceeds a predetermined moving range. Since the motor torque, rotor, coupling, and pinion inertia torque are lost, the feed bar is easily stopped by the brake plate and the brake shoe. In addition, since the member (moving body) including the feed bar that is moving with inertia that has lost meshing is stopped, the braking distance of the brake can be shortened. Furthermore, since the kinetic energy absorbed by the brake shoe in the event of an emergency can be estimated by estimating the kinetic energy at the maximum speed of the moving body, an optimal design can be easily made by calculation on a desk. Further, it is possible to prevent the apparatus from being damaged due to overrun in the movement in the advance / return direction having a large weight and moving speed.

  Further, the number of the brake shoes is two, the fixing portion includes shaft bolts extending in the moving direction of the two brake shoes, the urging members are disposed at both ends of the shaft bolt, and two brake shoes are provided. When the shoes are urged in the direction in which they approach each other (Claim 4), the effectiveness of the brake can be optimized in accordance with the weight and moving speed of the feed bar. In addition, if the adjustment is loosened, the stop state of the feed bar which has been urgently stopped can be easily released.

  Since the press machine with a feed device of the present invention includes the above-mentioned press machine feed device, it can be stopped urgently even if the feed bar overruns due to a servo abnormality. Therefore, it is possible to prevent the press machine from being damaged due to the overrun.

FIG. 1 is a side view showing an embodiment of a feed device of the present invention. 2a is a side view showing an embodiment of the transfer press of the present invention, and FIG. 2b is a cross-sectional view taken along the line WW of FIG. 2a. 3A is a cross-sectional view taken along line XX in FIG. 1, and FIG. 3B is a cross-sectional view taken along line YY in FIG. 3A. 4a is a cross-sectional view taken along the line ZZ of FIG. 3a, FIG. 4b is a side view of FIG. 4a, FIG. 4c is a cross-sectional view taken along the line aa of FIG. FIG. 5 is a cross-sectional view taken along the line II of FIG. 2a. 6 is a cross-sectional view taken along line II-II in FIG. 2b.

  First, the press machine with a feed device of the present invention will be described with reference to FIGS. 2a and 2b. The press device with a feed device shown in FIG. 2a is a transfer press in which a plurality of dies are attached to one press machine. The transfer press 20 includes a press machine 21 to which one or more dies 22... Are attached, and a feed device 1 of the present invention that conveys a member (conveyed object) to be pressed between the dies. . In addition, as a press machine with a feed device, a plurality of press machines each having one die attached thereto and one or more feed devices may be combined into one set. In that case, it uses for a tandem press line which conveys a to-be-conveyed object between press machines.

  The press machine 21 has a frame-like frame composed of a bed 23, four columns 24 (see FIG. 2b) rising from four front, rear, left and right sides of the bed, and a crown 25 provided at the upper ends of the columns. It has. A bolster 26 is provided above the bed 23. Further, both ends of a crankshaft (not shown) are rotatably supported by the crown, and the slide 27 moves up and down via a connecting rod provided on the crankshaft. An upper die 22 a is attached to the lower surface of the slide 27, and a lower die 22 b is attached to the upper surface of the bolster 26.

  The operation of the feed apparatus 1 shown in FIG. 1 is to clamp (clamp) the object to be conveyed with the left and right feed bars, lift (lift), advance (advance), lower (down), and release (unclamp). Thus, a series of operations of repeating to the next press position and retreating (returning) to the original position is repeated. First, an object to be conveyed, which is a characteristic configuration of the feed device 1 of the present invention, is fed in the front-rear direction, and when the feed bar moves beyond a predetermined range (overrun), the feed bar is stopped immediately. The configuration will be described. Thereafter, a configuration for performing operations of a clamp / unclamp system and a lift / down system will be described. When the feed bar overruns, the whole including the feed bar, fingers (not shown) and workpieces, which are members (moving bodies) downstream from the rotor of the servo motor, overrun. Therefore, kinetic energy is large.

  The feed device 1 shown in FIG. 1 includes a feed drive unit 2 attached to a column 24 by a bracket 28, and the feed drive unit 2 on the bolster 26 in the horizontal direction (advance / return: arrows L and R directions in FIG. 2b). A feed bar 3 that is driven and transports an object to be transported, and a stop mechanism (described later) that stops (emergency) the feed bar 3 when the feed bar 3 overruns due to an abnormality in the feed driving unit 2. 3 (see reference numerals 4 and 5 in FIG. 3a).

  The feed drive unit 2 includes a common base 6 attached to the bracket 28, a servo motor 7 attached to the common base 6, a pinion 8a to which a rotational force is transmitted from an output shaft 7a of the servo motor 7, A rack 8b that meshes with the pinion 8a is provided. Guide portions 9a and 9a for guiding linear motion guides 9 and 9 are provided at both ends of the common base 6 and on the lower surface side, respectively. The linear motion guides 9 and 9 are suspended from the guide portions 9a and 9a. A rack 8b is suspended from the linear motion guides 9 and 9, and is supported so as to be movable in the advance return direction.

  As shown in FIG. 3a, a connecting member 10 extends from a surface (back surface) opposite to the pinion 8a of the rack 8b. The connecting member 10 extends from the back surface of the rack 8 b in the direction opposite to the rack teeth, and is bent at a right angle downward in the middle and connected to the vicinity of the middle of the rod-shaped feed carrier 11. The feed carrier 11 is a rod-shaped member that is substantially orthogonal to the extending direction of the rack 8b, and guides the operation of clamping and unclamping. Near the lower end of the feed carrier 11, two linear motion guides 12, 12 are provided so as to be movable in the longitudinal direction. Each linear motion guide 12 is provided with a pin 12a and extends downward. Further, brackets 11 a and 11 a extend upward from the upper surfaces of both ends of the feed carrier 11. Each of the brackets 11 a is provided with the linear motion guide 9. The output shaft 7a of the servo motor 7 and the pinion 8a are directly connected by a coupling 13. The servo motor 7 is covered with a case 14.

  FIG. 3b shows a range where teeth that mesh with the pinion 8a of the rack 8b are formed. In the drawing, the entire length of the rack 8b is indicated by reference numeral 8c. A range indicated by reference numeral 8d excluding the vicinity of both ends of the rack is a range in which teeth for meshing with the pinion 8a are formed. A range 8d where the teeth are formed (hereinafter simply referred to as a range) is also a range in which the feed bar moves by meshing (predetermined movement range). The range 8d is formed to be equal to or longer than the distance that the feed bar 3 moves during normal operation (see the directions of arrows LR in FIG. 2b). Therefore, in an emergency (when a malfunction occurs) when the feed bar 3 moves beyond the range 8d, the pinion 8a loses the teeth meshing with the rack 8b. Torque from the servo motor 7 is not transmitted to the side.

  The feed bar 3 is an elongated member having a square cross-sectional shape, and the lower end portion of the pin 12a is inserted into a hole 3a formed at the base (servo motor side), and is not fixed. Therefore, the feed bar 3 is movable in the vertical direction in which the pins 12a extend. Thereby, lift-down operation is performed.

  As shown in FIG. 3 a, the stop mechanism is pushed into a fixing portion 4 provided on the outer side of the linear motion guide 9 of the common base 6 and a gap formed in the fixing portion 4, and the fixing portion 4 The brake plate 5 is stopped by a frictional force generated between the inner surface and the inner surface of the brake plate 5. The brake plate 5 is provided above the linear motion guide 12 above the feed carrier 11.

  As shown in FIGS. 4a and 4b, the fixing portion 4 is fixed to both ends of the common base 6 with fasteners such as bolts, and an intermediate plate 15 extending downward and a gap 16e between the intermediate plate 15 are provided. And two plate-like members 16 and 16 arranged in parallel. Guide holes 16 a and 16 a are respectively formed at both ends of the plate-like member 16. A guide bar 17 passes through the intermediate plate 15 through the guide holes 16a (see FIG. 4c). Therefore, the plate-like members 16 and 16 are guided so as to be movable in the extending direction of the guide rods 17 and 17. Brake shoes 16b and 16b are provided on the surface of the plate-like member 16 on the feed carrier 11 side (downward) and the side where they face each other (see FIG. 4d).

As shown in FIG. 4 a, a bolt hole 16 c is formed at the upper center of the plate-like member 16, and a shaft bolt 18 passes therethrough. The shaft bolt 18 passes through the two plate-like members 16 and 16 and the intermediate plate 15. Large-diameter washers 18b and 18b are passed through both ends of the shaft bolt 18, and are respectively accommodated in the large-diameter step portion 16d of the bolt hole 16c. Also, shaft bolt 18
One end of the head is provided with a head 18a. A male screw is formed at the tip of the shaft bolt 18 penetrating the other washer 18b. The male screw extends to a step 18d (see FIG. 4c) formed on the shaft bolt 18, and a nut 18c is screwed together. Springs (biasing members) 19 and 19 are disposed between the nut 18c and the head 18a and the inner surfaces of the step portions 16d and 16d of the two plate members 16, respectively. , 16 are urged along the shaft bolt 18 in a direction to approach each other.

  As shown in FIG. 4 c, the nut 18 c is screwed only up to the step portion 18 d of the shaft bolt 18. Therefore, the nut 18c is determined to have a spring mounting length that can generate a preset clamping force. Therefore, resetting is also easy. Even after an emergency stop, the brake plate 5 held by the fixed portion 4 can be released from being held by loosening the nut 18c. Therefore, the re-operation of the feed device 1 is easy.

  As shown in FIG. 4c, the brake plate 5 is a plate-like member, and a taper portion formed in a taper shape that becomes thinner toward a tip formed at a center body portion 5a and a longitudinal end portion thereof. 5b.

  Note that one plate-like member 16 can be made to approach the other plate-like member 16 with respect to the shaft bolt 18 by using one spring as the fixing portion 4. Further, a tapered portion capable of receiving the brake plate 6 may be formed at the end of the plate-like member 16 so that the tapered portion 5b of the brake plate 5 can be easily pushed.

  In the feed device 1, the number of teeth of the rack 8b is formed in a range C (the number of teeth is limited). Therefore, when the servo motor 7 runs away and the feed bar 3 exceeds a predetermined moving range, the rack 8b and the pinion 8a are not engaged, and the torque of the servo motor 7 is not transmitted to the rack 8b side. After that, the brake plate 5 of the overrun feed bar 3 opposes the urging force of the spring 19 and pushes the brake shoe 16b into the gap 16e. As a result, a frictional force is generated between the brake plate 5 and the brake shoe 16b, and the kinetic energy of the moving part from the rack 8b to the feed bar 3 is converted into heat energy by the frictional force. Can be stopped. Thus, even if the motor 7 runs away, the inertia load can be reduced by causing the pinion 8a to idle. In addition, since the brake plate 5 is held between the brake shoes 16b, the braking distance can be shortened. Further, since the braking distance is short, the space is also saved.

  In addition, since the feed bar is braked (braking) by sandwiching the brake plate with the brake shoe 16b, the stop is not accompanied by an impact such as hitting the stopper. For this reason, the feed bar can be stopped safely and softly, and since there is no damage to the apparatus, restarting after an emergency stop is easy. Further, according to the present invention, the brake shoe 16b sandwiches a member including the feed bar 3 that loses meshing at the time of abnormality and sandwiches the inertia, so that the abnormality is detected by a sensor or the like. Therefore, the time lag from the detection of an abnormality to the stop can be reduced and the braking distance can be shortened as compared with a brake system that operates by electromagnetic or pneumatic pressure. Further, since such a sensor and a brake system that operates by electromagnetic or pneumatic pressure are unnecessary, the structure is simple, there are few malfunctions, and maintenance is easy. When restarting, the brake plate 5 sandwiched between the brake shoes 16b and 16b can be easily pulled out by loosening the nut 18c. Thereafter, the nut 18c is tightened until it contacts the step 18d of the shaft bolt 18.

  Although not shown, the brake plate 5 may have a substantially circular cross section, and the brake plate 5 may be surrounded by three or more brake shoes 16b to be braked.

  Next, a configuration in which the feed bar 3 is clamped / unclamped and lifted down will be described. Returning to FIG. 2 a, the feed bar 3 is clamped and lifted by a clamp and lift unit 29 provided on the side of the bolster 26. As shown in FIG. 2b, the clamp / lift unit 29 includes a clamp mechanism 30 that moves the feed bar 3 in the clamp / unclamp direction (arrow B / F directions), and the lift / down direction (arrow U / D directions). And a lift mechanism 31 (see FIG. 5). The clamp / lift unit 29 is provided between the left and right columns of the press machine 21.

  As shown in FIG. 5, the clamp mechanism 30 includes a servo motor (clamp motor) 32. An output shaft 32 a of the servo motor 32 is connected to a shaft 34 via a coupling 33. A bevel gear 35 is provided at the tip of the shaft 34. The bevel gear 35 meshes with the receiving side bevel gear 36. As shown in FIG. 6, the shaft 37 provided with the receiving side gear 36 is pivotally supported by the frame of the clamp / lift unit 29. The shaft 37 is formed with a male screw of a ball screw. The shaft 37 is provided with a female screw member 37a that meshes with the male screw. The female screw member 37 a is connected to the moving member 38.

  On the upper surface of the moving member 38, there is provided a receiving portion 38a for placing the feed bar 3 and guiding its advancement and retreat. Therefore, when the clamp mechanism 30 is operated, the lower feed bar 3 in FIG. 2b moves in the front-rear direction (arrow B / F direction).

  As shown in FIG. 5, the lift mechanism 31 includes a servo motor (lift motor) 39. The output shaft 39 a of the servo motor 39 is connected to the shaft 41 via the coupling 40. A bevel gear 42 is provided at the tip of the shaft 41. The bevel gear 42 meshes with the receiving-side bevel gear 43.

  As shown in FIG. 6, the receiving-side bevel gear 43 is provided at the end of the spline shaft 44. The spline shaft 44 is provided with a mover 45 pivotally supporting a bevel gear 45a so as to be movable in the axial direction. The bevel gear 45a has a female spline that is engaged with the male spline of the spline shaft 44 on its inner diameter. Therefore, the bevel gear 45 a can move in the axial direction of the spline shaft 44 and can transmit the rotation of the spline shaft 44. The moving element 45 is connected to the lower end of the moving member 38 and moves integrally on the spline shaft 44. Further, a male screw 46 of a ball screw that moves up and down the member 38b inside the moving member 38 penetrates vertically and meshes with a female screw 47 of the ball screw provided on the moving member 38. Further, a bevel gear 46 a is provided at the lower end of the male screw 46 of the ball screw, and meshes with the bevel gear 45 a of the moving element 45.

DESCRIPTION OF SYMBOLS 1 Feed apparatus 2 Feed drive part 3 Feed bar 3a Hole 4 Fixing part 5 Brake plate 5a Main body part 5b Taper part 6 Common base 7 Servo motor 8a Pinion 8b Rack 8c Rack full length 8d Tooth formation range 9 Linear motion guide 9a Guide part 10 Connecting member 11 Feed carrier 11a Bracket 12 Linear motion guide 12a Pin 13 Coupling 14 Case 15 Intermediate plate 16 Plate member 16a Guide hole 16b Brake shoe 16c Bolt hole 16d Step part 16e Clearance 17 Guide rod 18 Shaft bolt 18a Head Part 18b Washer 18c Nut 18d Step part 19 Spring 20 Transfer press 21 Press machine 22 Mold 22a Upper mold 22b Lower mold 23 Bed 24 Column 25 Crown 26 Bolster 27 Slider 28 Bracket 29 Clamp / lift unit 30 Clamper mechanism 31 Lift mechanism 32 Servo motor 32a Output shaft 33 Coupling 34 Shaft 35 Bevel gear 36 Receiving-side hevel gear 37 Shaft 37a Female screw 38 Moving member 38a Receiving portion 38b Inner member 39 Servo motor 39a Output shaft 40 Coupling 41 Shaft 42 Bevel gear 43 Receiving hevel gear 44 Spline shaft 45 Moving element 45a Bevel gear 46 Male thread 46a Bevel gear 47 Female thread

Claims (5)

A feed device of a press machine that conveys a workpiece to be pressed between dies in a press machine or between presses to which a die is attached,
A feed bar that moves within a predetermined range in order to convey the object to be conveyed between the molds;
A fixed portion having at least two brake shoes fixed to the frame member and facing each other;
A brake plate that moves with the feed bar,
The fixing portion includes an urging member that urges the brake shoe in a direction approaching the brake shoe;
When the feed bar has moved beyond a predetermined range, I can push between the two brake shoes with the brake plate against the biasing force of the biasing member, moves in a state of being sandwiched between them feed apparatus of a press machine to stop the feed bar by the frictional force generated between the brake shoe and the brake plate in particular Ru good.
The brake plate is composed of a main body part and a taper part whose thickness is gradually reduced toward the tip formed at both ends of the main body part,
The brake shoe is disposed with a predetermined gap, and the gap has a width equal to or less than the plate thickness of the main body portion of the brake plate and is pushed against the urging member to obtain the thickness of the main body portion. 2. A press device for a press machine according to claim 1, wherein the feed device extends in substantially the same width. A pinion whose rotation is transmitted by a servo motor;
A rack that converts the rotational movement of the pinion into a linear movement;
2. The press machine according to claim 1, wherein the rack engages with a pinion within a predetermined movement range of the feed bar, and has a number of teeth that disengages the pinion when the feed bar moves beyond the movement range. Feed device. There are two brake shoes,
The fixed portion includes a shaft bolt extending in the moving direction of the two brake shoes;
The feed device for a press machine according to any one of claims 1 to 3, wherein the urging members are arranged at both ends of the shaft bolt and urge the two brake shoes in a direction in which the two brake shoes approach each other. A press machine,
The press machine with a feed apparatus which consists of the feed apparatus of the press machine in any one of Claims 1-4 installed in the press machine.

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