JP3420033B2 - Billet clamp device in forging machine - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art For example, a forging press machine A with a transfer feed device will be described with reference to FIGS. 1 and 2. Each press position P ₁ , P ₂ , P ₃ , P ₄ , P ₅
And the operation of gripping the work piece b with the finger e of the beam F that moves up and down, left and right, and front and back of the transfer feed device is repeated, thereby sequentially moving the work piece b to each press position P _1. And press work. At this time, the workpiece b is supplied to the press position P ₁ and the press-completed product is carried out (dispensed) from the press position P ₅ . The carry-out is transferred to a conveyor and moved to a required position by an appropriate means.

In such a forging press A, the work b is sent (supplied) to the first press position P _1.
In this case, the transfer means such as the chute C and the conveyor cannot meet not only the space relations but also the positioning (setting) accuracy, the handling of each feeding attitude of the workpiece b, and the like. For this reason, conventionally, a separate workpiece supply device B is installed beside the press machine A, and for example, a chute C feeds a billet b, which is a workpiece, from an induction heater to a predetermined position D, and this position Billet b of D
Is clamped by the clamp 50 and moved to the press position P ₁ (set). In the billet feeder B,
JP-A-6-328181, JP-A-8-17413
There are various types described in Japanese Patent Publication No. 4 and the like.

In the billet feeding device B, the forging press A has two types, that is, the billet b is vertically fed (solid line in FIG. 2) and the billet b is horizontally fed (dashed line in FIG. 2). Therefore, the clamp 50 can be rotated 90 degrees around its axis.

As an example of the billet supplying clamp device, the one shown in FIG. 17 is disclosed in Japanese Patent Laid-Open No. 8-174134. In this clamp device, a block 100 is fixed to the tip of a supply arm.
The cylinder 101 is provided in the cylinder 00, and the clamp rod 103 is driven by advancing / retreating the piston rod 102 to open / close the clamp claws 104a and 104b to grip or release the billet b. A pinion 105 is fixed to one end of the cylinder 101, and the pinion 105 is attached to the cylinder 101.
The rack 106 that is orthogonal to the
By reciprocating the cylinder 107, the pinion 105 is rotated 90 degrees forward and backward, and the clamp 103 is rotated 90 degrees forward and backward (reversed), which corresponds to the above-described vertical feed and horizontal feed.

[0006]

The inversion mechanism of the clamp 103 in the above-mentioned conventional clamp device is the clamp 10
Since the rack 106 and the like are attached to a portion eccentric from the reversal axis center (piston rod 102) of No. 3, the lateral width becomes large and the size becomes large. Larger clamp device
Since the inertia accompanying the operation increases, 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. The difficulty in controlling the position and maintaining the rotational accuracy causes deterioration of the product accuracy of the forged product and the material yield.

Further, this clamp device is composed of the clamp 1
03 to four links 103a, 103b, 103c, 1
It is made with 03d, and uses five pins for the link mechanism. Since this clamp 103 holds the billet b at high temperature and moves continuously, it is under severe operating conditions and the pin is most likely to be damaged. Therefore, it is preferable that the number of pins is at least one. .

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

[0009]

In order to solve the above-mentioned first problem, in the present invention, the clamp is rotated by the linear motion of the piston rod, and the clamp of the billet is supported by the clamp. The rotation mechanism has a mechanism for rotating about an axis, and a support shaft of the clamp is rotatably supported at both ends of the cylinder by penetrating the inside of the cylinder, and a piston in the cylinder is attached to a ball screw portion of the support shaft. When the fluid is applied to the inside of the cylinder, the piston slides and the support shaft rotates via the ball screw portion so that the clamp rotates.

In this way, if the clamp is reversed by the linear movement, the axis of the piston rod of the rotating mechanism can be made to be the same as the rotation center of the clamp, and the lateral width can be made as small as possible to reduce the size. In addition, the rotation axis and the support axis are not eccentric, so that the reversing action is stable.

In order to solve the second problem, according to the present invention, 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. It is rotatably attached in the middle, and clamp pawls are attached to one end of the swing link and the tip of the piston rod of the cylinder, respectively, and the other end of the swing link and the tip of the piston rod are connected by a link. It was adopted.

With this configuration, the clamp claw is opened and closed by the three links, and the number of the link pins is three. Therefore, the durability is higher than that of the conventional example. Further, at this time, since the clamp claw on the piston rod side is advanced and retracted along the guide provided on the chuck arm, the clamp claw is reliably and smoothly advanced linearly.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION
Reciprocate between the receiving position where the billet is conveyed by a conveyor and the bit transferring position of the forging press, hold the billet with the clamp at the tip of the supply arm, and deliver the billet from the receiving position. A clamp device including the clamp and a drive mechanism thereof in a device which is conveyed to a position and is supplied to a forging press machine has the rotating mechanism in the supply arm.

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

As a driving mechanism for the clamp, it is possible to adopt a structure in which the clamp driving cylinder is provided on the same shaft as the support shaft of the clamp, and the clamp pawl is opened and closed by sliding the piston in the cylinder. . in this case,
If the cylinder of this drive mechanism and the cylinder of the above-mentioned clamp reversing mechanism have the same axis and the supply arm is composed of these two cylinders, the reversing / driving mechanism of the clamp constitutes the swing arm of the clamp. Can be simplified and downsizing can be achieved.

It is preferable that both cylinders are of a self-return type by means of springs, and the supporting shaft is hollow so that the supporting shaft serves as a driving fluid passage to the clamp driving cylinder. In the case of the self-resetting type, the number of drive fluid passages may be one, and in the case of one, the clamp can be driven by using only the support shaft as the flow passage. In addition, the fact that the drive fluid flow path passes through the support shaft means that the flow path does not bend due to the inversion of the clamp, unlike a hose.
It is advantageous in terms of durability.

[0017]

FIG. 1 is a schematic plan view of one embodiment, FIG. 2 is a schematic front view of the same embodiment, FIG. 3 is a plan view of essential parts of a clamp of the same embodiment in a forward movement, and FIG. The left side view of the billet feeder of the embodiment, FIG. 5 is an enlarged cross-sectional view of an essential part of FIG. 4, FIG. 6 is an enlarged cross-sectional view of an essential part of FIG. 2, and FIG. 7 is an enlarged cross-sectional view of the clamp swinging downward from FIG. FIG. 8, FIG. 8 is a front view of FIG. 3, FIG. 9 is an explanatory view of the action of the clamp, FIG. 10 is a sectional view of the clamp portion, FIG. 11 is a sectional view of the same clamp portion, FIG. 12 is a clamping action diagram, and FIG. 12 is a right side sectional view of FIG.

As shown in FIGS. 1 and 2, the billet feeder B of this embodiment has a forging press A as in the conventional case.
The billet b is sent to the receiving position D on the chute C from the induction heater as shown by the arrow. At this time, a magazine (not shown) and a shutter S driven by an air cylinder are provided in the middle of the chute C, and each billet b from the induction heater is stored in the magazine one by one. The billets b are sent to the receiving position D one by one. The billet feeder B grips (chucks) the billet b at the receiving position D and presses the forging press A.
To the front position P ₀ or the first press position P ₁ .
During this setting operation, the lower part of the chute C swings downward as shown by the chain line in FIG. 2 so that it will not interfere with the clamp 50 described later. When the clamp 50 is removed, the shoot C returns.

As shown in FIGS. 1 to 7, the billet feeder 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 that moves back and forth penetrates the hole 10. Rails (linear guides) 12 are arranged on both sides of the hole 10, and sliders 11b fixed to the vertical frame 11 via brackets 11a are fitted to the rails 12. By this fitting, The vertical frame 11 moves back and forth on the 12 while keeping the vertical state.

A ball screw 13 is arranged along the hole 10, and the ball screw 13 is rotated by a servomotor M ₁ via a belt 13a and a pulley 13b. The belt 13a and the pulley 13b are provided with teeth, and the rotation amount of the motor M ₁ is reliably transmitted to the screw 13 as a pseudo gear coupling. A ball screw nut 14 integral with the vertical frame 11 is screwed onto the ball screw 13, and the vertical frame 11 is moved back and forth by the rotation of the screw 13, that is, the motor M ₁ .

A ball screw 15 is provided in the vertical frame 11 so as to be supported at its upper and lower ends.
Belt 15 by the servomotor M ₂ with electromagnetic brake
It rotates via a and the pulley 15b. The belt 15a and the pulley 15b are also toothed. Ball screw 15
The moving body 16 is screwed into the shaft via a ball screw nut 16a. A rear end of the swing arm 20 is rotatably attached to the 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 the support portion 22.
A first cylinder 30 provided at one end of the cylinder 30 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 shown in FIG.
The ball screw 31 moves forward as indicated by the 0-chain line and rotates the ball screw 31 by a quarter lead (rotates 90 degrees). When the application of the air a is released, the spring 34 returns the piston 33 to the state shown in FIG. At this time, the rotation of the piston 33 is blocked 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.
3 is 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 the 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 stop ring 44. A piston 45 is installed inside the second cylinder 40, and a rod 46 of the piston 45 protrudes from the other end of the piston 45.
Is applied to the piston 45 against the coil spring 47.
Moves forward.

The compressed air passages to the first and second cylinders 30 and 40 are first provided in the cap 23 at both ends of the pin 21 with an inlet a.
₁ , a ₂ are formed, and the inlets a ₁ and a ₂ are
It communicates with the inside of the cylinders 30 and 40 through the inside of 1 and the inside of the support part 22. The passage leading to the second cylinder 40 passes through the ball screw 31 and reaches the inside of the cylinder. In the figure, c is a packing for preventing air leakage such as an O-ring, 21a
Is a radial bearing and 21b is 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 linearly moves back and forth and a clamp claw 5 that swings back and forth.
1b and a link mechanism. The link mechanism includes a chuck arm 52 fixed to the cylinder 40 and a swing link 53.
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. 12 (a), when the piston 45 of the second cylinder 40 retracts, the clamp claws 51a and 51b are largely separated from each other, and the billet b at the receiving position D can be easily gripped. That is, the swinging clamp claw 51b is separated from the outer edge of the billet b by the length T. In this state, when the piston 45 moves forward, one clamp claw 51a moves forward along the guide 52a provided on the arm 52 and the other clamp claw 51b swings downward, as shown in FIG. Then grab billet b. In this way, the two claws 51a and 51b move relative to each other and are gripped, so that even if the diameter of the billet b is different, the center of the billet b is not greatly displaced.

As shown in FIGS. 4 to 7, the swing arm 2
In the center hole 24 of the support pin 21 of 0, the spline shaft 61
Are inserted and fixed (see FIG. 10). A trunnion (ball spline nut) 62 is fitted on the spline shaft 61 so as to be movable in the axial direction.
Is rotatably connected to the lower end of the vertical movement arm 63. The vertical movement arm 63 is integrally formed with a moving body 16 that is screwed onto the ball screw 15, 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 vertical movement frame 63 moves up and down along the vertical frame 11 via the moving body 16. Due to this vertical movement, the spline shaft 61 rotates up and down via the trunnion 62, and the swing arm 20 swings. At this time, the movement of the vertical movement arm 63 is performed stably because the moving element 65 is fitted to the rail 64 fixed to the vertical frame 11. The swinging angle of the swinging arm 20 is 120 degrees, and the receiving position D
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. By applying compressed air to this cylinder 70, the swing arm 20 is moved upward. Because of the force that directs the rocking arm 20, there is an advantage that the swinging arm 20 and the like do not inadvertently move at the time of adjustment or modification accompanying the size change of the billet b.

This embodiment is constructed as described above. Next, its operation will be described. As shown in FIG. 2, the swinging arm 20 is rotated by turning the ball screw 15 with the vertical frame 11 retracted. By swinging from the solid line to a chain line so that the clamp 50 faces the receiving position D, the billet b is positioned between the clamp claws 51a and 51b, and the billet b is grasped (FIG. 12 (a) to (b) state). . Thereafter, the ball screw 15 is reversed to return the swing arm 20 from the chain line to the solid line state, and then the vertical frame 11
Is moved forward (FIGS. 3 and 8) to make the billet b to be clamped correspond to the delivery position P ₀ or P ₁ , and then the clamp is opened to set the billet b to the delivery positions P ₀ and P ₁ . .

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

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

Further, in the movement of the swing arm 20, as shown by a chain line in FIG. 9, the swing arm 20 is directed upward by, for example, about 7 degrees to avoid the interference with the lower mold Q or the like and 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 hydraulically operated.

In the embodiment, the clamp device is moved by linear horizontal movement and vertical swing, but it is moved by a gear mechanism as disclosed in Japanese Patent Laid-Open No. 8-174134, Japanese Patent Application No. 8-350136. It is needless to say that the clamp device of the present invention can be applied to various transition mechanisms such as transitions by parallel links as described in No. That is, the transition by the parallel link forms, for example, as shown in FIG. 14, a parallelogram four-node rotary chain mechanism, and the opposing node 2 of the fixed node 1 is almost the same as the supply arm 20 with the clamp 50. The clamp device 5 having the structure is fixed, and the clamp 50 is rotated by the servomotor M using the drive nodes 4 and 4 as a crank, whereby the clamp 50 is moved to the receiving position D and the delivering position P ₀ .
Reciprocate during P ₁ . At this time, the clamp device 5
As shown in FIG. 15, the support portion 21 is provided with a flange 5a that is easily attached to the tip of the joint 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, the supply arm 20 (joint 5) is used as a take-out arm, and the leading ends of the take-out arms 5 and 20 are reciprocally moved to a forged product take-out position of the forging press A and a required position for the next process or the like, and take-out arm 20 The tip clamp 50 may grip the forging and carry the forging from the unloading position to the required position.

Further, also in the finger e of the forging press A, when the billet b is rotated 180 degrees (when the top and bottom are turned upside down) at either the front position P ₀ or the press positions P _{1 to} P ₅ , If the finger e is attached to the ball screw 31 of the first cylinder 30 as shown in FIG. 16, it can rotate and act. At this time, it is natural that the pair of fingers e, e facing each other perform this rotation function, and the movement stroke L of the piston 33 is 1/2 the ball screw 31.
The rotation is for the lead (180 degrees). In the figure, reference numeral 48 is a rotation preventing key for the finger e, and 49 is a spring for urging the finger e forward.

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

[0038]

According to the present invention, since the clamp is rotated by, for example, 90 degrees and 180 degrees by linear movement, the size of the entire apparatus can be reduced, and the clamping action is smooth and highly accurate. Will be things.

[Brief description of drawings]

FIG. 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 an essential part of the clamp according to the embodiment when the clamp is moved forward.

FIG. 4 is a left side view of the billet feeder of the same embodiment.

5 is an enlarged cross-sectional view of the main part of FIG.

6 is an enlarged cross-sectional view of the main part of FIG.

FIG. 7 is an enlarged sectional view of the clamp swinging downward.

FIG. 8 is a front view of FIG.

FIG. 9 is an explanatory view of the action of the clamp.

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

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

FIG. 12: Clamp action diagram

FIG. 13 is a right side sectional view of FIG.

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

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

FIG. 16 is a cross-sectional view of main parts of another embodiment.

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

[Explanation of symbols]

A Forging press B Billet feeder C Billet feeding chute D Billet receiving position H Basic frame P ₀ , P ₁ Billet passing position a Compressed air a ₁ , a ₂ Inlet b Billet e Finger 11 of transfer feed device 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 Clamps 51a and 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

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21K 27/00 B21D 43/00-43/18 B25J 15/00-18/00

Claims (2)

(57) [Claims] 1. The tip of the supply arm 20 is connected to a chute C,
A receiving position D where the billet b is conveyed by a conveyor and a billet passing position P ₀ of the forging press A,
Device for reciprocating to P ₁ and gripping the billet b with the clamp 50 at the tip of the supply arm 20, carrying the billet b from the receiving position D to the delivering position and supplying it to the forging press A In the clamp device including the clamp 50 and a drive mechanism thereof, a reversing mechanism for rotating the clamp 50 and the drive mechanism around the support shaft 31 is provided at the tip of the supply arm 20. A support shaft 31 of the clamp 50 penetrates through the cylinder 30 and is rotatably supported at both ends of the cylinder 30, and a ball screw portion 31a of the support shaft 31 is screwed with a piston 33 that slides in the cylinder 30. When the fluid a is applied to the inside of the cylinder 30, the piston 33 slides and the support shaft 31 rotates via the ball screw portion 31a, and The clamp 50 is adapted to rotate, the clamp drive cylinder 40 is provided on the same shaft as the support shaft 31, and the clamp claws 51a and 51b are opened and closed by sliding the piston 45 in the cylinder 40. A clamp drive mechanism is provided, and both cylinders 30, 40
Is a self-resetting type with springs 34 and 47,
Wherein the support shaft 31 in the hollow billet supply clamping device the support shaft 31 a forging press you characterized in that the driving fluid passage to the clamp drive cylinder 40. 2. A chuck arm 52 is provided at the tip of the clamp driving cylinder 40, and a swing link 53a is rotatably attached to the tip of the arm 52 in the middle thereof.
Clamping claws 51b, 5 are provided at one end of the swing link 53a and the tip of the piston rod 46 of the cylinder 40, respectively.
1a is attached, the other end of the swing link 53a and the tip of the piston rod 46 are connected by a link 53b, and the arm 52 is moved by moving the piston rod 46 forward and backward.
One clamp claw 51a along the guide 52a provided on the
With advancing and retracting the, according to claim 1, by rotating the swing link 53a via a link 53b swings the other clamp pawl 51b back and forth, both clamp jaws 51a, characterized by contact and separation of 51b Clamping device for billet supply of forging press.