JPH1177195A - Billet clamp device for forging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain miniaturization and smooth operation of the clamp device. SOLUTION: The clamp device clamps a billet (b), which is transferred by a chute, etc., and is at a receiving position, and supplies the billet to a delivery position of a forging press machine. A reversing mechanism of the clamp device 50 is constructed so that a piston 32, which slides in a cylinder 30, is screwed to a ball screw part of a support shaft 31 of the clamp 50, which pierces in the first cylinder 30 of self return type and is freely rotatably supported its both side walls. When applying a fluid into the first cylinder 30, time piston 32 is slided and the support shaft 31 is rotated through the ball screw part 31a, the clamp 50 is rotated by 90 deg. forward/backward. This forward/backward rotation is turned to a longitudinal feed and a laternal feed. The clamp. consists of three links 53a, 53b, etc., by extending/retracting of a piston rod 46 of a self return cylinder 40 coaxial to the support shaft 31, clamp paws 51a, 51b are opened/closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for clamping a billet in a forging machine such as a billet supply device for transferring a billet to a forging press.

[0002]

BACKGROUND ART For example, a forging press machine A with the transfer feed device, Fig. 1, with reference to FIG. 2, each press position P ₁ on the lower die _{Q, P 2, P 3,} P 4, P ₅
, And the operation of grasping and separating the workpiece b with the finger e of the beam F that moves up, down, left and right and back and forth of the transfer feed device is repeated, so that the workpiece b is sequentially moved to each of the press positions P _1. And press working. At this time, the workpiece b is supplied to the press position P _1, the press complete article (paid out) carried away from the press position P _5. The carry-out is transferred to a conveyor by an appropriate means and transferred to a required position.

In such a forging press machine A, feeding the workpiece b to the first press position P ₁ (supplied)
In this case, the transfer means such as the chute C and the conveyor cannot respond not only to the relationship of the space, but also to the positioning (set) accuracy, the correspondence to each feeding posture of the workpiece b, and the like. For this reason, conventionally, a separately provided workpiece supply device B is installed beside the press machine A, and for example, a billet b, which is a workpiece, is sent from an induction heater to a predetermined position D by a chute C, Billet b of D
The is moved to the press position P ₁ by gripping by the clamp 50 (which is set). In the billet supply device B,
JP-A-6-328181, JP-A-8-17413
There are various types described in, for example, Japanese Patent Application Laid-Open No. 4 (Kokai) 4

In the billet supply device B, the forging press A has two cases, one in which the billet b is fed vertically (in a solid line in FIG. 2) and the other in which the billet b is fed horizontally (in a chain line in FIG. 2). To this end, the clamp 50 can be rotated 90 degrees around its axis.

As an example of the billet supply clamping device, the one shown in FIG. 17 is disclosed in Japanese Patent Application Laid-Open No. Hei 8-174134. In this clamping device, a block 100 is fixed to the tip of a supply arm,
A cylinder 101 is provided in 00, and the clamp 103 is driven by the advance and retreat of the piston rod 102, and the clamp claws 104a and 104b are opened and closed to grip or release the billet b. Further, a pinion 105 is fixed to one end of the cylinder 101, and the cylinder 101 is fixed to the pinion 105.
And the rack 106 orthogonal to the
Is reciprocated by the cylinder 107 to rotate the pinion 105 forward and backward by 90 degrees, and to rotate the clamp 103 forward and backward (reverse) by 90 degrees, which corresponds to the above-described vertical feed and horizontal feed.

[0006]

The reversing mechanism of the clamp 103 in the above-mentioned conventional clamp device is a
Since the rack 106 and the like are attached to a portion eccentric from the inverted shaft center (piston rod 102) of No. 3, the lateral width is large and the size is large. Increasing the size of the clamping device
Since the inertia accompanying the operation increases, the clamp 1
03 position control becomes difficult. Also, the pinion 105
There is a backlash between the rack and the rack 106, which makes it difficult to maintain the rotational accuracy of the clamp. These difficulties in controlling the position and maintaining the rotation accuracy cause deterioration of the product accuracy of the forged product and the yield of the material.

[0007] Further, the clamp device is provided with a clamp 1
03 to four links 103a, 103b, 103c, 1
03d, and five pins are used for the link mechanism. Since the clamp 103 grips the high-temperature billet b and moves continuously, it is under severe operating conditions. Since it is the pin that is most likely to be broken, the number of pins is preferably as small as possible. .

A first object of the present invention is to reduce the size of a clamp device, and a second object is to reduce the number of links of a link mechanism of a clamp.

[0009]

According to the present invention, in order to solve the above-mentioned first problem, the clamp is rotated by a linear motion of a piston rod. The rotating mechanism has a mechanism in which a support shaft of the clamp penetrates through the cylinder and is rotatably supported at both ends of the cylinder, and a ball screw portion of the support shaft includes a piston in the cylinder. When a fluid is applied to the cylinder, the piston slides and the support shaft rotates via the ball screw portion, so that the clamp rotates.

In this manner, if the clamp is inverted by linear motion, the axis of the piston rod of the rotating mechanism can be made the same as the center of rotation of the clamp, and the lateral width can be reduced as much as possible to reduce the size. Since the rotation axis and the support axis are not eccentric, the reversing action can be stabilized.

In order to solve the second problem, the present invention is based on the assumption that a clamp is driven by a cylinder, a chuck arm is provided at the tip of the cylinder, and a swing link is provided at the tip of the arm. A structure in which the swinging link is attached rotatably in the middle, clamp claws are attached to one end of the swing link and the tip of the piston rod of the cylinder, and the other end of the swing link and the tip of the piston rod are connected by a link. It was adopted.

In this way, the clamp pawl is opened and closed by the three links, and the number of the link pins becomes three. For this reason, it is more durable than the above conventional example. Also, at this time, the clamp claws on the piston rod side are moved forward and backward along the guide provided on the chuck arm, so that the clamp claws are moved forward and backward reliably and smoothly.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The tip of a supply arm is
The billet is reciprocated between the receiving position where the billet is conveyed by the conveyor and the bit transferring position of the forging press machine, the billet is gripped by the clamp at the tip of the supply arm, and the billet is transferred from the receiving position. In a clamp device including the clamp and a driving mechanism thereof in a device that is transported to a position and supplied to a forging press, the rotation mechanism is configured in the supply arm.

That is, a reversing mechanism for rotating the clamp and its driving mechanism around its support shaft is provided at the tip of the supply arm. The piston may be rotatably supported at both ends, and the piston in the cylinder may be screwed to the ball screw portion of the support shaft.

As a driving mechanism of the clamp, it is possible to adopt a configuration in which a clamp driving cylinder is provided on a shaft of the clamp on the same axis, and a clamp claw is opened and closed by sliding of a piston in the cylinder. . in this case,
If the cylinder of this drive mechanism and the cylinder of the above-described clamp inversion mechanism have the same axis, and the supply arm is constituted by these two cylinders, the inversion and drive mechanism of the clamp will constitute the swing arm of the clamp, And the size can be reduced.

The two cylinders may be of a self-return type using a spring, the support shaft may be hollow, and the support shaft may be used as a drive fluid passage to the clamp drive cylinder. In the case of the self-return type, only one drive fluid passage is required, and if it is one, the clamp can be driven by using only the inside of the support shaft as the flow passage. In addition, the passage of the drive fluid flow path in the support shaft is different from a hose or the like due to the inversion of the clamp, in that the flow path does not bend, etc.
This is advantageous in durability and the like.

[0017]

1 is a schematic plan view of an embodiment, FIG. 2 is a schematic front view of the embodiment, FIG. 3 is a plan view of a main part of the embodiment with a clamp moved forward, and FIG. FIG. 5 is an enlarged cross-sectional view of a main part of FIG. 4, FIG. 6 is an enlarged cross-sectional view of a main part of FIG. 2, and FIG. 7 is an enlarged cross-section of the billet supply device of FIG. FIG. 8, FIG. 8 is a front view of FIG. 3, FIG. 9 is an explanatory view of the operation of the clamp, FIG. 10 is a cross-sectional view of the clamp portion, FIG. 11 is a cross-sectional view of the same clamp portion, FIG. 12 is a right side sectional view of FIG.

As shown in FIGS. 1 and 2, a billet supply device B of this embodiment is a forging press A
The billet b is sent from the induction heater to the receiving position D on the chute C as indicated by an arrow. At this time, a magazine (not shown) and an air cylinder driven shutter S are provided in the middle of the chute C, and billets b from the induction heater are stored in the magazine one by one, and the magazine is opened and closed by opening and closing the shutter S. Are sent to the receiving position D one by one. The billet supply device B grasps (chucks) the billet b at the receiving position D, and forging press A
To set before the position P ₀ or the first press position P ₁ of.
During this setting operation, the lower portion of the chute C swings downward as shown by the chain line in FIG. 2 so as not to interfere with the clamp 50 described later. When the clamp 50 leaves, the chute C returns.

As shown in FIGS. 1 to 7, the billet supply device B is provided on a base frame H (legs are omitted) installed near the forging press A. A hole 10 in the front-back direction is formed in the base frame H, and a vertical frame 11 moving back and forth passes through the hole 10. Rails (linear guides) 12 are arranged on both sides of the hole 10, and a slider 11 b fixed to the vertical frame 11 via a bracket 11 a is fitted to the rail 12. The vertical frame 11 moves forward and backward while maintaining the vertical state.

Further, arranged ball screw 13 along the bore 10, the ball screw 13 is rotated via the belt 13a and the pulley 13b by the servo motor M _1. The belt 13a and the pulley 13b is a toothed, as a pseudo gear coupling, rotation of the motor M ₁ is adapted to be reliably transmitted to the screw 13. The ball screw 13 is fit ball screw nut 14 screw integral to the vertical frame 11, screw 13, that is, by the rotation of the motor M _1, the vertical frame 11 is moved back and forth.

A ball screw 15 is provided in the vertical frame 11 and supported at its upper and lower ends.
Belt 15 by a servo motor M ₂ of electromagnetic brake
a through the pulley 15b. The belt 15a and the pulley 15b are also provided with teeth. Ball screw 15
, A moving body 16 is screwed via a ball screw nut 16a. A rear end of the swing arm 20 is rotatably attached to a lower end of the vertical frame 11 via a pin 21.

As shown in FIGS. 10 and 11, the swing arm 20 has a support portion 22 through which a pin 21 penetrates.
And a second cylinder 40 provided at one end of the cylinder 30. A ball screw 31 is rotatably supported at both ends in the first cylinder 30, and a ball screw nut 32 forming a part of a piston 33 is screwed to the screw portion 31a. When air a is applied to the piston 33, as shown in FIG.
The ball screw nut 32 is opposed to the coil spring 34 in FIG.
The ball screw 31 moves forward as indicated by the chain line 0, and the ball screw 31 rotates by a quarter lead (rotates 90 degrees). When the application of the air a is released, the piston 33 returns to the state shown in FIG. At this time, the rotation of the piston 33 is prevented by the guide pin 33a, and the movement stroke L of the piston 33 becomes a quarter lead of the ball screw 31.

The tip of the ball screw 31 is the second cylinder 40
Are fitted into the rear end of the
1, 40 are integrated. The second cylinder 40 is rotatably supported by a cylindrical case 43 connected to an outer cylinder of the first cylinder 30 by a radial bearing 42a and a thrust bearing 42b. The bearings 42a and 42b are prevented from coming off by screwing the retaining ring 44. A piston 45 is provided inside the second cylinder 40, and a rod 46 of the piston 45 projects from the other end.
Is applied, the piston 45 is opposed to the coil spring 47.
Moves forward.

First, the compressed air passages to the first and second cylinders 30 and 40 are connected to the caps 23 at both ends of the pins 21 by the inlets a.
₁ and a ₂ are formed, and the inlets a ₁ and a ₂ are
It communicates with the cylinders 30 and 40 through the inside 1 and the inside of the bearing 22. The passage leading to the second cylinder 40 passes through the inside of the ball screw 31 and reaches the inside of the cylinder. In the figure, c is an air leak preventing packing such as an O-ring, 21a.
Denotes a radial bearing, and 21b denotes a thrust bearing.

A clamp 50 is provided at the other end of the second cylinder 40.
Is provided. The clamp 50 includes a clamp claw 51a that moves linearly back and forth and a clamp claw 5 that swings back and forth.
1b and a link mechanism. The link mechanism includes a swing link 53 and a chuck arm 52 fixed to the cylinder 40.
The center of a is pinned, and the rear end of the swing link 53a and the chuck arm 52 are connected by a link 53b. One clamp claw 51a is fixed to the piston rod 46, and the other clamp claw 51b is fixed to the tip of the swing link 53a.

Therefore, as shown in FIG. 12A, when the piston 45 of the second cylinder 40 retreats, the two clamp claws 51a and 51b are largely separated from each other, so that the billet b at the receiving position D can be easily grasped. That is, the swinging clamp claw 51b is separated from the outer edge of the billet b by the length of T. In this state, when the piston 45 advances as shown in FIG. 2B, one clamp claw 51a advances along a guide 52a provided on the arm 52, and the other clamp claw 51b swings downward. And grab billet b. As described above, since both claws 51a and 51b move and grip each other, even if the billet b has a different diameter, the center of the billet b is not largely displaced.

As shown in FIGS. 4 to 7, the swing arm 2
The spline shaft 61 is inserted into the center hole 24 of the
Are inserted and fixed (see FIG. 10). A trunnion (ball spline nut) 62 is movably fitted in the spline shaft 61 in the axial direction.
Is rotatably connected to the lower end of the vertically moving arm 63. The vertically moving arm 63 has a moving body 16 screwed to the ball screw 15 integrated therewith and is movably fitted to a rail (linear guide) 64 of the vertical frame 11 via a slider 65. When the ball screw 15 rotates, the vertically moving frame 63 moves vertically along the vertical frame 11 via the moving body 16. By this vertical movement, the spline shaft 61 rotates vertically via the trunnion 62, and the swing arm 20 swings. At this time, the movement of the up-down movement arm 63 is performed stably because the moving element 65 is fitted to the rail 64 fixed to the vertical frame 11. The swing angle of the swing arm 20 is 120 degrees or the like.
The position is determined as appropriate.

A piston rod 71 of a cylinder 70 fixed to the vertical frame 11 is fixed to the upper end of the vertically moving arm 63. When compressed air is applied to the cylinder 70, the swing arm 20 is moved upward. There is an advantage that the swing arm 20 and the like do not move unnecessarily at the time of adjustment accompanying the size change of the billet b or modification.

This embodiment is constructed as described above. Next, the operation will be described. As shown in FIG. 2, by turning the ball screw 15 while the vertical frame 11 is retracted, the swing arm 20 is rotated. Is swung from the solid line to the dashed line to bring the clamp 50 to the receiving position D, position the billet b between the clamp claws 51a and 51b, and grip the billet b (FIGS. 12A to 12B). . Thereafter, the ball screw 15 is reversed to return the swing arm 20 from the chain line to the solid line state.
The moved forward (FIG. 3, FIG. 8), then made to correspond to the billet b and the delivery position P ₀ or P ₁ to clamp sets the billet b in the delivery position P _0, P ₁ by opening the clamp .

When the setting is completed, the clamp 50 is moved to the receiving position D by the reverse operation (the clamp 50 is in the open state), and thereafter the same operation is repeated to supply the billet b to the forging press A sequentially. I do.

At the time of this operation, adjustment of the amount of movement of the vertical frame 11 corresponds to a change in the transfer position P ₀ or P ₁ . When the billet b is fed laterally, the piston 32 in the first cylinder 30 is advanced and the second cylinder 4
0 (clamp 50) is rotated 90 degrees. That is, it is set at the delivery position in the state shown by the chain line in FIG.

In the movement of the swing arm 20, as shown by a chain line in FIG. 9, the swing arm 20 is set upward, for example, by about 7 degrees to avoid interference with the lower mold Q or the like and to correspond to the delivery position. After that, the swing arm 20 may be swung downward and set as indicated by the solid line.

The cylinders 30, 40 and 70 may be operated by hydraulic pressure.

In the embodiment, the clamping device is shifted by linear horizontal movement and vertical swinging. However, shifting by a gear mechanism as disclosed in Japanese Patent Application Laid-Open No. 8-174134, Japanese Patent Application No. 8-350136. Needless to say, the clamping device of the present invention can be applied to various transition mechanisms such as transition by a parallel link such as a symbol. That is, for example, as shown in FIG. 14, the transition by the parallel link forms a parallelogram four-node rotating chain mechanism, and the opposite node 2 of the fixed node 1 is almost the same as the supply arm 20 with the clamp 50 described above. By fixing the clamp device 5 having the above structure and rotating the drive nodes 4 and 4 as cranks by the servo motor M, the clamp 50 is moved to the receiving position D and the transferring position P ₀ ,
Reciprocating between P _1. At this time, the clamping device 5
As shown in FIG. 15, the bearing 21 is provided with a flange 5a that can be easily attached to the tip of the node 2.

In each of the above embodiments, the billet b is supplied to the forging press A, but the forged product (finished product) may be taken out from the forging press A. That is, by taking the supply arm 20 (section 5) as a take-out arm, the tips of the take-out arms 5, 20 are reciprocated between a forged product take-out position of the forging press A and a required position for the next step or the like. The forged product may be gripped by the clamp 50 at the tip, and the forged product may be transported from the removal position to a required position.

Further, in the finger e of the forging press A, when the billet b is rotated by 180 degrees (when the top and bottom are reversed) at any of the front position P _{0 and the} press positions P _{1 to} P ₅ , FIG. When the finger e is attached to the ball screw 31 of the first cylinder 30 as shown in FIG. At this time, it is natural that the opposing pair of fingers e and e perform this rotation function, and the moving stroke L of the piston 33 is ２ of the ball screw 31.
The rotation for the lead is 180 degrees. In the figure, reference numeral 48 denotes a key for preventing rotation of the finger e, and reference numeral 49 denotes a spring for urging the finger e forward.

The present invention can be applied not only to the forging press A but also to a clamp of a manipulator of a forging machine such as a forging roll.

[0038]

According to the present invention, the clamp is rotated by, for example, 90 degrees or 180 degrees by linear movement, so that the entire apparatus can be reduced in size, and the clamping action is smooth and high in accuracy. It will be.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of one embodiment.

FIG. 2 is a schematic front view of the embodiment.

FIG. 3 is a plan view of a main part of the embodiment in a state where the clamp is moved forward;

FIG. 4 is a left side view of the billet supply device of the embodiment.

FIG. 5 is an enlarged sectional view of a main part of FIG. 4;

FIG. 6 is an enlarged sectional view of a main part of FIG. 2;

FIG. 7 is an enlarged sectional view in which the clamp swings downward.

FIG. 8 is a front view of FIG. 3;

FIG. 9 is a diagram illustrating the operation of the clamp.

FIG. 10 is a sectional view of a clamp unit.

FIG. 11 is a sectional view of a clamp unit.

FIG. 12 is a diagram showing a clamping action.

FIG. 13 is a right sectional view of FIG.

FIG. 14 is a schematic front view of another embodiment.

FIG. 15 is a sectional view of the clamp portion of the embodiment.

FIG. 16 is a sectional view of a main part of another embodiment.

FIG. 17 is a schematic sectional view of a conventional example.

[Explanation of symbols]

A forging press machine B billet feeder C billet feed chute D billet receiving position H foundation frame P _0, P ₁ billet delivery position a compressed air a _1, a ₂ inlet b billet e transfer feeder fingers 11 vertical frame 13, 15 Ball screw 16 Moving body 20 Swing arm (supply arm) 21 Swing arm support pin 30 First cylinder 31 Ball screw (clamp support shaft) 31a Ball screw part 32 Ball screw nut 33 Piston 34 Return coil spring 40 Second Cylinder 45 Piston 46 Piston rod 47 Return coil spring 50 Clamp 51a, 51b Clamp claw 52 Chuck arm 52a Clamp claw guide 53a Swing link 53b Connection link 61 Spline shaft 62 Trunnion 63 Vertical movement arm 70 Balance cylinder 71 Piston rod

Claims (4)

[Claims] 2. A forging machine comprising: a forging billet b;
And a mechanism for rotating the billet b by a required angle, and a mechanism for rotating the clamps 50 and e of the billet b around the support shaft 31. The rotating mechanism includes the clamp 50, The support shaft 31 of e is rotatably supported at both ends of the cylinder 30 through the inside of the cylinder 30, and a piston 32 sliding in the cylinder 30 is screwed to a ball screw portion 31a of the support shaft 31. When a fluid a is applied to the cylinder 30, the piston 32 slides and the support shaft 31 rotates through the ball screw portion 31a to rotate the clamps 50 and e. Billet clamp device. 2. A tip of the supply arm 20 is connected to a chute C,
The receiving position D where the billet b is conveyed by a conveyor or the like and the billet transferring position P ₀ of the forging press A,
By reciprocating in the P _1, and gripping the billet b in the clamp 50 of the supply arm 20 tip, device supplies the billet b, forging presses A carrying the transfer position from the receiving position D A clamping device comprising the clamp 50 and a driving mechanism thereof, wherein a reversing mechanism for rotating the clamp 50 and the driving mechanism about its support shaft 31 is provided at a tip of the supply arm 20; The support shaft 31 of the clamp 50 penetrates the inside of the cylinder 30 and is rotatably supported at both ends of the cylinder 30. A piston 33 sliding in the cylinder 30 is screwed into the ball screw portion 31a of the support shaft 31. When the fluid a is applied to the cylinder 30, the piston 33 slides and the support shaft 31 rotates via the ball screw portion 31a, and A clamp device for billet supply of a forging press, wherein the clamp 50 rotates. 3. A clamp driving cylinder 40 is provided on the support shaft 31 on the same shaft, and a piston 4 in the cylinder 40 is provided.
5, the clamp pawls 51a, 51b are opened and closed to form a clamp drive mechanism, and the two cylinders 30, 40 are of a self-return type by springs 34, 47. Make this shaft 3 hollow
The billet supply clamp device for a forging press according to claim 2, wherein 1 is a drive fluid passage to the clamp drive cylinder 40. 4. A chuck arm 52 is provided at the tip of the clamp driving cylinder 40, and a swing link 53a is attached to the tip of the arm 52 so as to be rotatable in the middle thereof.
Clamp claws 51b, 5c are provided at one end of the swing link 53a and the tip of the piston rod 46 of the cylinder 40, respectively.
1a, and the other end of the swing link 53a and the tip of the piston rod 46 are connected by a link 53b.
Of one clamp claw 51a along the guide 52a provided on the
And moving the swinging link 53a through the link 53b to swing the other clamp claw 51b back and forth, thereby bringing the two clamp claws 51a and 51b into and out of contact with each other. Device for billet supply of forging press machine.