JP3751211B2 - Beam front and rear drive mechanism in transfer device of forging press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transfer device of a forging press, and more particularly to a front / rear (open / close) drive mechanism of a finger beam for conveying the workpiece.
[0002]
[Prior art]
For example, the forging press A with transfer device will be described with reference to FIG. 1 and FIG. 2. Each press position P ₁ , P ₂ , P ₃ , P ₄ , P ₅ is determined on the lower die Q, and the transfer is performed. By repeating the operation of gripping the workpiece a with the fingers b of the beam F moving up and down, left and right and back and forth of the apparatus B and the separating operation, the workpiece a is sequentially moved to each press position P _1. Move and press work. At this time, the workpiece a is supplied to the press position P ₁ or the front position P ₀ , and the press-completed product is carried out (dispensed) from the press position P ₅ . The unloading is transferred to a conveyor by an appropriate means and transferred to a required position.
[0003]
The transfer device B in this type of forging press A is provided with frame casings G at both ends of the forging press A, and the pair of front and rear beams F and F are passed between the frame casings G and G. It is general that the beams F and F are moved in the vertical direction (Z direction), the front-rear direction (Y direction), and the left-right direction (X direction), that is, three-dimensionally, by driving means provided in the frame casing G. .
[0004]
The workpiece a is moved in and out of the lower mold Q by the vertical movement of the beam F (lift / down operation), and the finger b is moved close to and separated by the longitudinal movement of both beams F and F. The workpiece a is clamped or released (clamping / unclamping operation), and the workpiece F is moved back to the next process by the movement of the beam F in the horizontal direction (advance / return operation).
[0005]
As a mechanism for moving the beam F in the XYZ triaxial directions, as shown in FIG. 7, a vertically moving frame 10 is attached to a frame casing G via a guide 11, and the frame 10 is screwed by a motor 12 fixed to the frame casing. The frame 10 is provided with a ball screw 15 driven by a servo motor 14, and a support arm 17 for the beam F is moved to the ball screw 15 via a ball nut 16. Some of the configurations are made possible. In the figure, 13a is a bearing for supporting the screw 13c fixed to the frame casing G.
[0006]
In this configuration and the like, the front / rear (open / close) drive mechanism of the beams F and F is disclosed in Japanese Patent Laid-Open No. 6-304690 (Patent 1), and as shown in FIG. Is a reverse screw 15a, 15b, and disclosed in Japanese Patent Laid-Open No. 5-92228 (Publication 2), the ball screw is rotated by a servo motor and the movement of the ball nut screwed into the ball screw is controlled. Some of them are converted into beam opening and closing operations of the beams F and transmitted by a link mechanism.
[0007]
[Problems to be solved by the invention]
In the beam front-rear drive mechanism described in the publication 1, since the ball screw is formed as a left and right reverse screw, it becomes substantially longer as two ball screws, and it is necessary to increase the width in the front-rear direction of the transfer device B. is there. Further, since the beam F is screwed to the left and right screws 15a and 15b via the ball nut 16, the space between both the beams F and F is widened, and the beam F of the forging press main body is inserted as much. The opening (working window) is also enlarged, and the left and right columns H of the forging press A are easily shaken. If they are shaken, the machining accuracy is affected. It is necessary to increase the rigidity.
[0008]
The beam back-and-forth drive mechanism described in Gazette 2 has a driving force acting on the beam F from the link mechanism to the beam F in the vertical direction when the beam F moves back and forth. Control to absorb movement. However, this control is very complicated. In particular, if the size of the workpiece a changes, the holding width, that is, the longitudinal movement width of the beams F and F also changes, and the control must be changed accordingly, which is very troublesome.
[0009]
This invention makes it a subject to solve the said problem.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention first moves the beam back and forth by slidably locking the beam to the guide shaft. The guide shaft has an axial shape (linear shape). If the guide shaft is engaged and moved, the beam moves linearly when the guide shaft is opened and closed.
[0011]
Next, according to the present invention, the drive unit and the beam are connected by a link mechanism. This is because the link mechanism such as the Porsche mechanism and the heart mechanism can transmit the driving force of the driving machine as the linear motion of the beam. At this time, the operating force may be linear or rotational. The linear operating force may be a cylinder or ball screw connection. In the case of a cylinder, the cylinder base is pivotably attached to the frame, and the piston rod is attached. When connected to the link, the swing of the link connecting point can be absorbed by the swing of its base.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
As an embodiment of the present invention, a pair of beams along a line direction of a plurality of press positions in series are moved up and down, left and right, and front and back, and an operation of sandwiching a workpiece by a finger of the beam and an operation of separating the workpiece are performed. In a mechanism for moving the beam back and forth in the transfer device of the forging press machine that sequentially transfers the workpiece to the respective press positions, a front and rear direction guide shaft is provided on the frame, and the beam is attached to the guide shaft. Can be slidably locked to be movable in the front-rear direction, and a structure in which both beams are connected to the front-rear drive machine via a link mechanism can be employed.
[0013]
As the link mechanism, the opening and closing links are connected to the beams by absorbing the vertical movement caused by the rotation of the opening and closing links, and both the opening and closing links are rotatably attached to the frame at the same height. Are connected by transmission links at the top and bottom of the rotation center, and the length from the connection point of both the opening and closing links to the respective rotation centers is the same, and the rotation centers of the both opening and closing links are respectively connected to the beam. The length etc. which make the length to a connection point the same, and connect one side of an opening-and-closing link with the said drive machine, etc. are employ | adopted.
[0014]
In this link mechanism, the rotation centers of both opening and closing links are the same height, and the length from the rotation center to the connection point to both beams is the same, so that both beams move back and forth at the same height. It will be. In addition, since the two open / close links are connected by the transmission link above and below the rotation center, the other open / close link also moves along with the movement of one open / close link, and the movement is a movement of opening / closing (contacting / separating) both beams. Become. Furthermore, since the length from the connection point of both open / close links to the transmission link to the respective rotation centers is the same, the rotation angle of one open / close link and the rotation angle of the other open / close link are the same. That is, both beams move back and forth at the same height by the operation of one opening / closing link.
[0015]
In this link mechanism, if the length from the force point of the opening / closing link to the center of rotation by the drive unit is the same as the length from the center of rotation to the connection point to the beam, the movement length of the force point of the opening / closing link and the beam The movement length becomes the same, and the control of the back and forth movement of the beam becomes easy. Conversely, if they are not the same, the moving length of the beam can be made shorter or longer with respect to the moving length of the power point at the ratio of the length ratio.
[0016]
As the driving machine, a servo motor is suitable from the viewpoint of ease of control and accuracy. In this case, for example, a ball screw rotated by the servo motor is provided on the frame, and the ball screw is screwed. The structure which connected one side of the said opening-and-closing link via the link to the ball nut is employ | adopted. At this time, the frame may be provided with a stopper for restricting the movement range of the ball nut.
[0017]
【Example】
An embodiment is shown in FIGS. 1 to 6, and a forging press A with a transfer device B according to this embodiment has five upper and lower molds P _{1 to} P ₅ and Q _{1 to} Q ₅ as described above. By repeating the operation of sandwiching the workpiece (billet) a with the finger b of the beam F moving up and down, left and right and back and forth of the transfer feed device B, and separating the workpiece a, the workpiece a is moved to each mold P ₁ , Q ₁ ..., P ₅ and Q ₅ are sequentially transferred to perform press working. Hereinafter, the lowering positions of the upper molds P _{1 to} P ₅ are indicated as P _{1 to} P ₅ with the press (process) positions being set.
[0018]
At the time of this pressing, the billet a from the induction heater is sent to the front position P ₀ of the forging press A corresponding to the pressing operation by a billet supply device (not shown), and the billet a is transferred to each press position by the transfer device B. Sequentially sent to P _{1 to} P ₅ to be product a ₅ . In other words, the billet a at the front position P ₀ has a smoothing process at the first press position P ₁ , a rough finishing process at the second press position P ₂ , a forming process at the third press position P ₃ , and a precision at the fourth press position P ₄ . finishing, simultaneous punching of the inside and outside of Bali is made in the fifth press position P _5.
[0019]
In the transfer device B, a frame casing G is provided on each of the left and right columns H of the forging press A, and a pair of beams F and F are passed between the frame casings G and G. The beams F and F are moved forward and backward, up and down by a clamping / unclamping operation mechanism (back and forth movement mechanism), a lift / down operation mechanism (up and down movement mechanism) and an advance / return operation mechanism (left and right movement mechanism) in the frame casing G. Moved left and right. The frame casings G on both sides have the same configuration except for the advance / return operation mechanism.
[0020]
As the lift / down operation mechanism and the advance / return operation mechanism, well-known and known ones described in the publications 1 and 2 and JP-A 2000-246378 are employed.・ The unclamping mechanism is unique.
[0021]
That is, as shown in FIGS. 3 to 6, a guide shaft 21 is provided at the lower part of the frame 10 that is moved up and down and left and right by various means, and the sliders 23 are placed on the left and right of the guide shaft 21 with the central bearing 22 as a boundary. It is movably fitted in the axial direction. Both sliders 23 are provided with downward arms 24, and the beams F are supported on the arms 24. Both beams F and F are in a symmetrical position with the center line O of the guide shaft 21 as an axis. Thus, when the beam F is supported by the guide shaft 21, the load on the link mechanism is reduced, the processing accuracy is high, and the design is economical.
[0022]
A ball screw 25 and a guide shaft 26 are provided in parallel through a bearing 27 on the upper portion of the frame 10, and the ball screw 25 is rotated forward and backward by a servo motor 28 via a coupling 29. A ball nut 30 is screwed onto the ball screw 25, and the ball nut 30 is integrated with the slider 31 of the guide shaft 26. When the ball screw 25 rotates, the ball nut 30 (slider 31) moves forward and backward ( Move in the direction of the arrow in FIG. The amount of movement is regulated by the stoppers 32 on both sides.
[0023]
In the middle of the frame 10, a trident drive link 33 and a bifurcated (cross-shaped) driven link 34 are rotatably attached to the left and right of the center line O. The rotation centers 33 a and 34 a are center lines. It is symmetrical with respect to O (at the same height). The upper end 33b of the drive link 33 is connected to the ball nut 30 via an auxiliary link 35 (connection point 33b), and the lower ends 33c and 33c of both the drive and driven links 33 and 34 are both connected via the auxiliary link 35. The beams F and F are connected to the arms 24 and 24, respectively. Further, the projecting end 33 d in the middle of the drive link 33 and the middle 34 d (character-shaped bent portion) of the driven link 34 are connected by a transmission link 36.
[0024]
The length from the rotation center 33a of the drive link 33 to the connection point (force point) 33b with the ball nut 30 and the connection points (action points) 33c of the respective arms 24 from the rotation centers 33a, 34a of the drive / driven links 33, 34. , 34c are the same L _1, and the length from the rotation center of the drive link 33 to the connection point 33d between the rotation link 34a and the transmission link 36 and the rotation center 34a of the driven link 34 to the transmission link 36 are the same. The length to the connection point 34d is the same L ₂ , and the length between the connection points at both ends of each auxiliary link 35 is the same L ₃ . By setting the lengths L ₁ , L ₂ , and L ₃ , the moving amount of the ball nut 30 and the moving amounts of both beams F are the same. Instead of the auxiliary link 35, a pin is formed on one side, and a long hole through which the pin moves is formed on the other side, and the displacement of each connecting portion can be absorbed by the fitting structure.
[0025]
The drive link 33 and the driven link 34 are provided as a pair on the left and right in FIG. 1, and as shown in FIG. 5, a rotation shaft 37 is provided on the frame 10, and a boss 38 of the links 33 and 34 is fitted on this shaft 37. It is free to rotate.
[0026]
This embodiment is configured as described above, and the servo motor 28 is driven by the command from the controller of the transfer device B to rotate the ball screw 25, via the link mechanism including the drive link 33 and the like. The beams F and F are moved back and forth. FIG. 3 shows when the workpiece a is clamped (closed) during the operation, and FIG. 6 shows when the workpiece a is opened. Both positions are determined by the stopper 32.
[0027]
【The invention's effect】
According to the present invention, the beam can be moved linearly by being engaged with the guide shaft as described above, so that the opening / closing operation of the beam can be easily and accurately controlled by the link mechanism.
[Brief description of the drawings]
FIG. 1 is a schematic partially cut plan view of a forging press with transfer device according to one embodiment. FIG. 2 is a partially cut front view of the same. FIG. Fig. 5 is a plan view of the main part of Fig. 3; Fig. 6 is a side view of the main part of the same embodiment; Fig. 7 is a schematic perspective view of the conventional example;
A Forging press B Transfer device F Beam G Frame casing P ₁ , P ₂ , P ₃ , P ₄ , P ₅ Press position a Work piece b Finger O Center line between both beams 10 Frame 11 Frame lifting guide 21 Guide shaft 23 Slider 24 Beam arm 25 Ball screw 26 Guide shaft 28 Servo motor 30 Ball nut 31 Slider 32 Stopper 33 Drive link 33a Drive link rotation center 33b Drive link force point 33c Drive link action point 33d Drive link transmission link Connection point 34 Driven link 34a Rotation center 34c of driven link Action point 34d of driven link Connection point 35 of driven link with transmission link Auxiliary link 36 Transmission link

Claims (4)

A pair of beams F, F along the row direction of a plurality of press positions P ₁ , P ₂ , P ₃ , P ₄ , P ₅ in series are moved up and down, left and right, and back and forth, and the finger F of the beam F It is a mechanism that moves the beam F back and forth in the transfer device B of the forging press A that moves the workpiece a to the respective press positions in order by repeating the operation of clamping and releasing the workpiece a. And
The frame 10 is provided with a guide shaft 21 in the front-rear direction, and the beams F and F are slidably engaged with the guide shaft 21 so as to be movable in the front-rear direction. Connected to the front-rear drive machine 28 via
Said link mechanism, said both beams F, to F, the their respective opening and closing links 33 and 34, moves the pin and the pin is fitted in place of the same coupling length of the auxiliary link 35 or the auxiliary link 35 elongated hole The vertical movement due to the rotation of the opening / closing link is absorbed and connected through the fitting structure, and both the opening / closing links 33, 34 are rotatably attached to the frame 10 at the same height. Are connected by transmission links 36 above and below the rotation centers 33a, 34a, and the lengths from the connection points 33d, 34d of the open / close links 33, 34 to the transmission links 36 to the respective rotation centers 33a, 34a are the same L _2. In addition, the lengths from the rotation centers 33a, 33a of the both opening / closing links 33, 34 to the respective connection points 33c, 34c to the beams F, F are set to the same L ₁ , and Beam back and forth drive mechanism either 33 of ink in the transfer apparatus of forging press you characterized in that it is configured to swing in and coupled to the drive motor 28. The length L ₁ from the force point 33 b of the opening / closing link 33 to the rotation center 33 a by the driving machine 28 is the same as the length L ₁ from the rotation center 33 a to the connection point 33 c to the beam F. A beam back-and-forth drive mechanism in a transfer device of a forging press according to claim 1 . The drive machine is a servo motor 28, and a ball screw 25 rotated by the servo motor 28 is provided on the frame 10, and one of the opening / closing links 33 via a link 35 with a ball nut 30 screwed to the ball screw 25. The beam back-and-forth drive mechanism in the transfer device of the forging press machine according to claim 1 or 2 , characterized in that In the above-described beams F and F, the open / close links 33 and 34 are connected through the auxiliary links 35 having the same connection length by absorbing the vertical movement caused by the rotation of the open / close link. and coupling length L ₃ of the auxiliary link 35 which connects the F and closing links 33 and 34, the coupling length L ₃ of the link 35 which connects the one 33 of the opening and closing link and the ball nut 30, that it was the same 4. A beam front-rear drive mechanism in a transfer device for a forging press according to claim 3 .

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