JP4007503B2 - Forging machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a forging machine capable of easily eliminating an overload state when a driving reaction force of a mold generated in the machine becomes an overload state.
[0002]
[Prior art]
Conventionally, various types of forging machines have been used depending on the shape of the forged part, the use of the part, and the like. For example, a multi-stage horizontal forging machine is used as a forging machine for efficiently mass-producing relatively small forged parts. The multistage horizontal forging machine has a structure in which a ram for holding a punch and a thrust generating means for driving the ram are provided inside a strong frame, and a die is fixed to a portion of the frame facing the ram. ing. A multi-stage horizontal forging machine that employs a tie rod type frame has a structure in which a ram that holds a punch and a thrust generation means that drives the ram and a bed that holds a die are connected by a tie rod.
In addition, the metal mold | die used for a multistage horizontal forging machine has the structure where the die | dye and punch which bear only one part among several forging processes are aligned in the horizontal direction in order of a process process, and were integrated. And the workpiece | work raw material moves gradually between each die | dye and punch by a conveying apparatus, and shaping | molding progresses gradually and finally obtains a required product shape (for example, refer patent document 1). ).
[0003]
[Patent Document 1]
JP 2000-102839 A ([0023], FIG. 1)
[0004]
[Problems to be solved by the invention]
By the way, in the multistage horizontal forging machine, the die drive reaction force generated in the machine during the forging operation may be overloaded. This overload occurs when (I) the workpiece posture with respect to each die and punch is different from the original due to a workpiece conveyance error by the conveying device. (II) The die is damaged and the damaged die is bitten. (III) When it is caused by supplying materials with different dimensions, (VI) The timing of opening and closing the mold and the operation of the conveying device is wrong, and the conveying device is clamped together with the material. (V) It is caused by various factors such as a case where a plurality of materials are simultaneously formed due to a mistake in conveying the workpiece by the conveying device.
[0005]
Therefore, some conventional multi-stage horizontal forging machines are provided with detecting means for detecting overloading in order to prevent damage to the forging machine and the mold when the machine is overloaded. When an overload is detected by the detection means, the operation of the machine is stopped urgently at that time. However, in the case of a multi-stage horizontal forging machine that does not have an overload detection means, if the machine is overloaded, damage to the forging machine is inevitable, or even if damage can be avoided, The entire machine is stopped in a state where it is elastically deformed by overload.
[0006]
In any case, the conventional multi-stage horizontal forging machine stops when the machine is overloaded in the event of a trouble, so the recovery work is performed in the stroke direction of the punch composed of wedge-shaped parts. The adjustment mechanism (cotter) was struck and it was necessary to carry out after forcibly releasing the overload by elastic deformation. Further, when such a recovery method cannot be adopted, it is necessary to melt a part of the apparatus to release the overload. As described above, when the conventional multistage horizontal forging machine is brought to an emergency stop, a lot of time and cost are consumed until the recovery.
[0007]
The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to immediately stop the operation of the forging machine when the forging machine is overloaded and to deform or disassemble the machine. It is possible to remove the overload without any trouble and to quickly perform a recovery operation when a trouble occurs in the forging machine.
[0008]
[Means for Solving the Problems]
A forging machine according to claim 1 of the present invention for solving the above-described problem is a tie rod that connects a frame including a ram that holds a punch and a thrust generation means that drives the ram, and a bed that holds a die. A hydraulic cylinder having a sleeve and a piston formed in an annular shape at a connecting portion between the tie rod and the frame or a connecting portion between the tie rod and the bed, which is a portion that receives a driving reaction force of a mold. The center through hole is inserted into the tie rod, the piston is fixed to the tie rod, and the cylinder chamber of the hydraulic cylinder has a prescribed driving reaction force or die tie rod during forging operation. By holding at a predetermined hydraulic pressure corresponding to the tightening force by, the sleeve is brought into close contact with the frame or the bed, When the detection pressure of the load detection means incorporated in the hydraulic circuit of the hydraulic cylinder exceeds a specified value, the relief valve incorporated in the hydraulic circuit of the hydraulic cylinder is automatically opened, and the oil in the hydraulic cylinder is By providing a load removing means for mechanically separating the connecting portion between the tie rod and the frame or the connecting portion between the tie rod and the bed from the load transmission system of the thrust generating means of the mold by removing To do.
According to the present invention , a so-called tie rod type frame having a structure in which a ram that holds a punch and a frame that includes a thrust generation means that drives the ram and a bed that holds a die is connected by a tie rod is employed. In a multi-stage horizontal forging machine, when the load detection means provided at the part that receives the drive reaction force of the mold monitors the drive reaction force of the mold during forging, and when the overload is detected by the load detection means The part that receives the driving reaction force is mechanically separated from the load transmission system of the thrust generating means of the mold by the load removing means, and the overload is instantaneously released.
[0009]
Further, according to this configuration, when the portion of the mold that receives the driving reaction force receives a driving reaction force within a specified range, the hydraulic cylinder is held within the predetermined hydraulic pressure range. As with the rigid parts, the hydraulic cylinder can sufficiently receive the driving reaction force of the mold and can perform the forging operation. Further, the driving reaction force of the mold during forging applied to the portion that receives the driving reaction force of the mold can be monitored by the load detection means via the internal pressure of the hydraulic cylinder.
[0010]
Further, according to this configuration, when the hydraulic cylinder provided in the portion that receives the driving reaction force of the mold receives a driving reaction force exceeding a specified value, the relief valve is automatically opened, Drain the oil in the hydraulic cylinder. Then, the hydraulic cylinder that has received the driving reaction force of the mold like the rigid part is shortened, and the part that receives the driving reaction force is mechanically separated from the load transmission system of the thrust generating means of the forging machine. be able to. As a result, the overload is released instantly.
[0011]
A forging machine according to a second aspect of the present invention is the forging machine according to the first aspect, wherein the control means for stopping the operation of the thrust generating means when the detected pressure of the pressure sensor exceeds a specified value. It is characterized by comprising.
According to the present invention, it is possible to prevent an increase in overload by stopping the operation of the thrust generating means by the control means when the detected pressure of the load detecting means exceeds a specified value.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0013]
In FIG. 1, the whole picture of the multistage horizontal forging machine 1 according to the embodiment of the present invention is three-dimensionally shown. Moreover, in FIG. 2, the principal part side surface of the multistage horizontal forging machine 1 is shown with a partial cross section. The multistage horizontal forging machine 1 includes a frame 5 including a ram 3 that holds a punch 2 and thrust generation means 4 that drives the ram 3 (the “flywheel type” that is usually used in a multistage horizontal forging machine); The bed 7 holding the die 6 is connected by a tie rod 8. Further, a hydraulic cylinder 9 is provided at the connecting portion between the tie rod 8 and the bed 7.
The drive reaction force of the mold generated when the ram 3 is driven by the thrust generating means 4 and the forging pressure is applied to the workpiece by the punch 2 and the die 6 includes the frame 5, the tie rod 8, the hydraulic cylinder 9, and the bed 7. The load transmission system of the thrust generating means 4 cancels out all of them in the multistage horizontal forging machine 1.
[0014]
The sleeve 9a and the piston 9b of the hydraulic cylinder 9 are formed in an annular shape. Therefore, a through hole is formed at the center of the hydraulic cylinder 9 and this through hole is inserted into the tie rod 8. A washer 10 is interposed between the bed 7 and the sleeve 9 a of the hydraulic cylinder 9. Furthermore, a nut 11 coupled to a screw portion 8a provided at an end of the tie rod 8 is brought into close contact with the piston 9b partially protruding from the sleeve 9a. Then, the sub-nut 12 for locking the nut 11 is screwed into the threaded portion 8a of the tie rod 8, the nut 11 and the sub-nut 12 are brought into close contact with each other, and the nut 11 and the sub-nut 12 are fixed with the bolts 13. Yes.
[0015]
The oil hole 9c of the hydraulic cylinder 9 is connected to the hydraulic circuit 14 shown in FIG. The cylinder chamber of the hydraulic cylinder 9 has a predetermined hydraulic pressure (hereinafter referred to as “predetermined pressure”) corresponding to a predetermined driving reaction force of the mold or a tightening force by the tie rod 8 during the forging operation of the multistage horizontal forging machine 1. Called “hydraulic pressure”). The fixing position of the nut 11 with respect to the threaded portion 8a of the tie rod 8 is adjusted so that the sleeve 9a, the washer 10 and the bed 7 are in close contact with each other while the hydraulic cylinder 9 is held within a predetermined hydraulic pressure range.
[0016]
As shown in FIG. 3, the hydraulic circuit 14 of the hydraulic cylinder 9 is configured to hold the hydraulic cylinder 9 at a predetermined hydraulic pressure by pumping oil from the oil tank 15 by the pump 16 and sending it to the hydraulic cylinder 9. In addition, relief valves 17 and 18 and a pressure sensor 19 are incorporated in the hydraulic circuit 14. The relief valve 17 is automatically opened when the hydraulic pressure of the hydraulic cylinder 9 exceeds a predetermined hydraulic pressure, and oil is extracted from the hydraulic cylinder 9. The relief valve 18 is provided for temperature compensation. The pressure sensor 19 transmits the detection signal to the control unit 20, and the control unit 20 monitors whether the hydraulic pressure of the hydraulic cylinder 9 exceeds a predetermined hydraulic pressure range. When the hydraulic pressure of the hydraulic cylinder 9 exceeds a predetermined hydraulic pressure range, the control means 20 stops the operation of the mold thrust generating means 4.
[0017]
FIG. 4 is a flowchart showing an operation control procedure of the multistage horizontal forging machine 1 having the above-described configuration.
(1) During normal operation of the multistage horizontal forging machine 1, the hydraulic cylinder 9 holds a hydraulic pressure corresponding to the tightening force by the tie rods.
(2) The pressure sensor 19 and the control means 20 detect a hydraulic pressure that increases due to a load (mold reaction force) generated during molding.
(3) The control means 20 determines whether or not the hydraulic pressure detected by the pressure sensor 19 exceeds a preset hydraulic pressure value for overload detection. If not, steps (1) to (3) are repeated.
(4) In step (3), if the hydraulic pressure detected by the pressure sensor 19 exceeds the set value, the machine is stopped by an operation such as disengaging the clutch of the thrust generating means 4 of the mold. At the same time, the relief valve 17 is automatically opened and oil is extracted from the hydraulic cylinder 9.
[0018]
The effects obtained by the embodiment of the present invention having the above-described configuration are as follows. The embodiment of the present invention has a structure in which a ram 3 that holds a punch 2 and a frame 5 that includes thrust generation means 4 that drives the ram 3 and a bed 7 that holds a die 6 are connected by a tie rod 8. In a multi-stage horizontal forging machine 1 employing a so-called tie rod type frame, a hydraulic cylinder 9 is provided at a connecting portion between a tie rod 8 and a bed 7 which is a part that receives a driving reaction force of a mold. And the driving reaction force of the metal mold | die during the forging added to the said connection part is monitored by the pressure sensor 19 incorporated in the hydraulic circuit 14 of the hydraulic cylinder 9. FIG.
[0019]
That is, a load detection means for detecting a load generated in the machine during the operation of the multistage horizontal forging machine 1 by the hydraulic cylinder 9 held at a predetermined hydraulic pressure and the pressure sensor 19 incorporated in the hydraulic circuit 14 of the hydraulic cylinder 9. Is configured.
In addition, when the overload is detected by the load detecting means, a load removing means for mechanically separating the portion that receives the driving reaction force from the load transmission system of the thrust generating means 4 of the mold is provided as a hydraulic cylinder. 9, the relief valve 17 incorporated in the hydraulic circuit 14 and the control means 20.
[0020]
When the hydraulic cylinder 9 receives a driving reaction force exceeding a specified value, the relief valve 17 is automatically opened to drain the oil in the hydraulic cylinder. Then, the hydraulic cylinder 9 that has received the driving reaction force of the mold as in the case of the rigid part is shortened, and the connecting portion between the tie rod 8 and the bed 7 is connected from the load transmission system of the thrust generating means 4 of the forging machine, Can be separated mechanically. Therefore, the overload generated in the multi-stage horizontal forging machine 1 is released instantaneously. At the same time, an increase in overload can be prevented by receiving the pressure detected by the pressure sensor 19 and stopping the operation of the thrust generating means 4 of the mold by the control means 20.
Therefore, it is not necessary to deform or disassemble the device when removing the overload factor. And after removing the factor of an overload in the state without load, a forging machine can be recovered by returning the hydraulic cylinder 9 to the original state. Therefore, even if the multistage horizontal forging machine 1 is in an emergency stop, the time and cost required for the restoration are greatly reduced as compared with the conventional multistage horizontal forging machine.
[0021]
In the embodiment of the present invention, the hydraulic cylinder 9 is provided at the connecting portion between the tie rod 8 and the bed 7. In the multistage horizontal forging machine 1, the tie rod 8, which is a part that receives the driving reaction force of the mold. The hydraulic cylinder 9 may be provided at the connecting portion (the end of the tie rod 8 opposite to the example of FIG. 1) between the frame 5 and the frame 5. Further, instead of the pressure sensor 19 constituting the load detecting means, a load cell provided in the mold or a strain gauge attached to the tie rod 8 may be used. Furthermore, the embodiment of the present invention can be used not only for the multistage horizontal forging machine 1 employing a tie rod type frame but also for other types of forging machines.
[0022]
【The invention's effect】
Since the present invention is configured as described above, when an overload is applied to the forging machine during the forging operation, the operation is immediately stopped and the overload can be removed without deforming or disassembling the machine. It is possible to quickly perform recovery work when trouble occurs in the forging machine.
[Brief description of the drawings]
FIG. 1 is a three-dimensional view showing the whole of a multistage horizontal forging machine according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view of the main part side surface of the multistage horizontal forging machine shown in FIG.
FIG. 3 is a schematic diagram showing a hydraulic circuit of a hydraulic cylinder in the multistage horizontal forging machine shown in FIG. 2;
FIG. 4 is a flowchart showing an operation control procedure of the multistage horizontal forging machine shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Multistage horizontal forging machine 2 Punch 3 Ram 4 Thrust generating means 5 Frame 6 Die 7 Bed 8 Tie rod 9 Hydraulic cylinder 14 Hydraulic circuit 17, 18 Relief valve 19 Pressure sensor 20 Control means

Claims (2)

A frame having a ram that holds a punch and a thrust generation means that drives the ram, and a bed that holds a die, and a structure that is connected by a tie rod;
A through-hole in the center of a hydraulic cylinder having a sleeve and a piston formed annularly at the connecting portion between the tie rod and the frame, or the connecting portion between the tie rod and the bed, which is a part that receives the driving reaction force of the mold Is inserted into the tie rod, the piston is fixed to the tie rod, and the cylinder chamber of the hydraulic cylinder corresponds to the prescribed driving reaction force of the mold or the tightening force by the tie rod during the forging operation. By holding at a predetermined hydraulic pressure, the sleeve is brought into close contact with the frame or the bed,
When the detected pressure of the load detecting means incorporated in the hydraulic circuit of the hydraulic cylinder exceeds a specified value, the relief valve incorporated in the hydraulic circuit of the hydraulic cylinder is automatically opened, and the oil in the hydraulic cylinder is By providing a load removing means for mechanically separating the connecting portion between the tie rod and the frame or the connecting portion between the tie rod and the bed from the load transmission system of the thrust generating means of the mold by removing Forging machine to do.   The forging machine according to claim 1, further comprising a control unit that stops the operation of the thrust generation unit when a detected pressure of the pressure sensor exceeds a specified value.

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