JP2003220439A - Heading machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a heading machine in which the stucking of a material and a punch in a die is simply and easily eliminated when the material and the punch get stuck in the die at the beating point of the punch. <P>SOLUTION: The crank pin 7 of a crank shaft 6 which is eccentrically rotated with a driving shaft provided on a machine base is connected with a ram through a connection rod 8 and a connection pin 9. The ram 4 is configured to reciprocate by the rotation of the crank pin 7. A hydraulic cylinder 21 for pressing upward the connecting part of the connection rod 8 and the crank pin 7 is provided at the lower part in the vicinity of the center of the crank pin 7 in the state that the crank pin 7 and the connection rod 8 are almost aligned. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a punch arranged on the front surface of a die and a ram that moves forward and backward in opposition to the die. The present invention relates to a forging machine for forming a molded article.

[0002]

2. Description of the Related Art Conventionally, in a press forming machine which has a die and a punch which face each other and press-forms a material into a predetermined shape, the punch is held in a protruding state on a ram that moves back and forth with respect to the die. The raw material is punched into the die by the forward movement of the ram, and the raw material is press-formed between the punch and the die to form a molded product having a predetermined shape.

By the way, during the forging operation, for example, the following material is punched and punched twice in a state in which the previously molded article is not discharged from the die, and an overpressure of a predetermined amount or more acts to cause the die and punch. If the punch is in a closed restraint condition or if overpressure exceeds a predetermined value due to other factors, the material and the punch are stuck in the die at the front dead center of the punch, making it impossible to move the ram forward and backward. May be.

As means for preventing this problem, for example, a strain sensor is provided on a punch, a die, a frame or the like, and the strain amount detected by the strain sensor is replaced with an electric signal to detect overpressure by a waveform or a numerical value. It has been proposed to send a stop signal to the molding machine to stop the operation of the molding machine when the overpressure is detected.

[0005]

However, in the forging molding machine described above, when the overpressure is detected, the material and the punch are on the verge of being clogged in the die. Therefore, the strain sensor detects this and the molding machine detects this. Even if a stop signal is sent to the side, the ram cannot be stopped immediately due to inertia, so that there is still a problem that the locking phenomenon occurs at the front dead center of the punch. Then, it takes a lot of time and labor for the operator to manually eliminate the clogging each time, and there is a problem that productivity is lowered.

Therefore, it is an object of the present invention to provide a forging machine which can easily and easily eliminate the clogging of the die when the material and the punch are clogged in the die at the front dead center of the punch.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is such that a punch is arranged on the front surface of a die and a ram which advances and retreats in opposition to the die, and the ram moves forward. In a forging machine in which a material is forged between a punch and a die to form a molded product of a predetermined shape, it is connected to a crankpin of a crankshaft which is eccentrically rotated by a drive shaft provided on a machine base. The ram is connected through the rod and the connecting pin, and the ram is configured to reciprocate by the rotation of the crank pin,
In the lower part near the center of the crank pin when the crank pin and the connection rod are almost in a straight line, there is a push-up means that pushes up the connection part of the connection rod and the crank pin upwards. When clogging occurs, the ram is forcibly retracted by swinging the crank pin upward through the connection rod by the push-up means through the connection rod, and the clogging due to overpressure of the die and punch is eliminated. It is characterized by

According to a second aspect of the present invention, in the structure according to the first aspect, the pushing-up means includes a cylinder, and the piston of the cylinder is provided with a lever, while the lever is provided near the lever. When the cylinder is not operating, the lever is turned on to allow the molding machine to operate, and when the cylinder is operating, the lever is turned off to prevent the molding machine from operating. .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a forging machine according to an embodiment of the present invention will be described. FIG. 1 shows a multi-stage press forming machine 1 provided with a plurality of forming stations. A die block 2 is provided at a predetermined position on a machine base of the press forming machine 1, and dies 3 are arranged on the die block 2 at predetermined intervals. At the same time, the same number of punches 5 are arranged facing each die 3 on the front surface of the ram 4 that moves back and forth toward these dies 3,
A plurality of forging stations are configured by the die 3 and the punch 5, and the material (not shown) is forged between the punch 5 and the die 3 in a stepwise manner in a rough to fine manner by the reciprocating movement of the punch 5. Is configured to.

Incidentally, such a forging machine 1 is provided with a transfer chuck means (not shown) for transferring a material between adjacent forging stations.

On the ram 4 side, a crank pin 7 of a crank shaft 6 is eccentrically rotated by a drive shaft (not shown).
A connecting pin 9 is attached to the ram 4 via a connection rod 8, and the connecting pin 9 is connected to the ram 4. As a result, the ram 4 moves back and forth toward the die side as the crankshaft 6 rotates, and therefore the punch 5 attached to the tip of the ram 4 moves back and forth with respect to the die 3.

A punch block 10 is fixed to the front surface of the ram 4, a punch holder 11 is attached to the punch block 10, the punch 5 is fitted in the holder 11, and the punch holder 11 is attached to the punch holder 11. It is held by a stop (not shown) provided. Further, a tapered groove 12 is formed between the punch block 10 and the ram 4, a tapered pressure receiving plate 14 is provided in the tapered groove 12 so as to be in contact with the tapered surface 13 on the ram side and movable in the vertical direction, and the punch block 10 is also provided. A support member 15 is fixedly installed over the upper surfaces of both the ram 4 and the ram 4. Then, the screw shaft 16 is fixedly planted on the upper surface of the tapered pressure receiving plate 14, the upper side of the screw shaft 16 penetrates the support member 15 and is taken out upward, and the nut member 17 is screwed to the taken-out portion. As a result, when the nut member 17 is rotated to move the taper pressure receiving plate 14 in the up-down direction, the punch 5 is rotated by the spacer 18 interposed between the taper pressure receiving plate 14 and the punch 5. The amount of protrusion of the punch 5 from the punch holder 11 is adjusted by moving the punch 5 in the axial direction. Further, in FIG. 1, reference numeral 19 is a knockout pin provided on the die side for pushing a molded product from the die 3 to the outside after press forming, and
Reference numeral 20 is a stripper that is provided on the ram side and that projects the molded product to the die side after the press forming.

Although not shown, a strain sensor is provided on the punch, the die, the frame, etc., and the strain amount detected by the strain sensor is replaced with an electric signal to detect the overpressure by a waveform or a numerical value. When an overpressure is detected, a stop signal is sent to the molding machine to stop the operation of the molding machine.

Then, in the lower part near the center of the crank pin 7 in a state where the crank pin 7 and the connection rod 8 are substantially in a straight line, a hydraulic cylinder (pushing up the connecting portion of the connection rod 8 and the crank pin 7 upward) When a clogging due to overpressure of the die 3 and the punch 5 occurs, the hydraulic cylinder 21 moves the crank pin 7 upward via the connection rod 8 with the crankshaft 6 as a fulcrum. Ram 4 by rocking
Is forcibly retracted, and clogging due to overpressure of the die 3 and the punch 5 is eliminated. Note that reference numeral 2
Reference numeral 2 is a fixing bolt for fixing the connection rod 8 and the connecting pin 9.

Further, the piston 21a of the hydraulic cylinder 21
On the other hand, a lever 23 is provided near the lever 21a, and when the hydraulic cylinder 21 is not operated, the lever 21a is turned on to allow the molding machine to operate near the lever 21a. When the hydraulic cylinder 21 is operated, the lever 21a is turned off to move the molding machine. There is a safety mechanism provided by the switch 24 that disables the operation of the. Since the existing safety mechanism is used, a description of its specific structure will be omitted.

Next, the operation of the forging machine constructed as described above will be described. During normal operation, when the ram 4 moves forward, the punch 5 drives the material into the die 3 to form a forged part, and after the forming, the ram 4 moves backward to punch 5
Is released from the die 3, and the knockout pin 19 on the die side moves forward to push the molded product out of the die 3, thus repeating a series of molding operations.

On the other hand, during the forging operation, for example, the previously molded product is not ejected from the die 3 and the next material is driven in and double-pressed. When the punch 5 and the punch 5 are in a closed constraint state, or when overpressure more than a predetermined value is generated due to other factors, when the strain sensor detects this overpressure, a stop signal is sent to the molding machine side to send the molding machine. Will stop working.

However, even if this is detected by the strain sensor and a stop signal is sent to the molding machine side, the ram 4 cannot be stopped immediately due to inertia, and therefore, the material and the punch 5 at the front dead point of the punch 5 are stopped. The die 3 may be stuck and the ram 4 may not be able to move back and forth.

When the die 5 and the punch 5 stop at the front dead center due to the sealing constraint of the die 3 and the die 5, the hydraulic cylinder 21 is operated to move the connecting portion of the crank pin 7 and the connection rod 8 upward. Push up to. As a result, as shown in FIG. 2, the crank pin 7 is swung upward through the connection rod 8 with the crank shaft 6 as a fulcrum, and the ram 4 is swung along with the upward swing of the crank pin 7. It is forced to retreat. As a result, the punch 5 is forcibly pulled out from the die 3 and the blockage due to overpressure between the die 3 and the punch 5 is eliminated. Therefore, without performing the laborious and time-consuming manual work as in the past,
Clogs due to overpressure on the die 3 and the punch 5 can be easily and easily cleared.

Further, the piston 21a of the hydraulic cylinder 21
On the other hand, a lever 23 is provided near the lever 21a, and when the hydraulic cylinder 21 is not operated, the lever 21a is turned on to allow the molding machine to operate near the lever 21a. When the hydraulic cylinder 21 is operated, the lever 21a is turned off to move the molding machine. Since a safety mechanism by the switch 24 that disables the operation of the hydraulic cylinder 21 is provided, the lever 21a turns off the switch 24 when the hydraulic cylinder 21 is in operation, so that the molding machine may be mistakenly turned on. Also, the molding machine is not operated and its safety can be secured.

In the above-mentioned embodiment, the hydraulic cylinder is used as the push-up means 21.
It is needless to say that the jack is not limited to the hydraulic cylinder and may be a jack using an air cylinder or a motor.

As for the operation timing of the pushing-up means 21, in order to reduce the damage of the die and punch and the clogging of the die and the punch as much as possible, the operation is performed by the sensor in association with the OFF operation accompanying the abnormal situation of the strain sensor. It is preferable to carry out at the same time when the machine is stopped. It goes without saying that the pushing-up means 21 may be activated at any timing after the operation of the machine is stopped.

[0023]

As described above, according to the present invention, the ram is connected to the crank pin of the crank shaft eccentrically rotated by the drive shaft provided on the machine base via the connection rod and the connecting pin, and the crank pin While the ram is configured to reciprocate by rotation, push the connection part of the connection rod and crank pin upwards in the lower part near the center of the crank pin when the crank pin and connection rod are almost straight. Since the lifting mechanism is provided to raise the ram, when the jam occurs due to overpressure of the die and punch, the ram is forced to retreat by swinging the crank pin upwards with the crank shaft as a fulcrum via the connection rod by the lifting mechanism. This makes it possible to eliminate the clogging caused by overpressure of the die and punch, which makes it more troublesome and labor-consuming than before. Without performing work, simply facilitates the clogging due to excessive pressure in the die and the punch and quickly be eliminated,
It is possible to improve productivity.

Further, while a lever is provided on the piston of the hydraulic cylinder, the lever is turned on near the lever to allow the molding machine to operate when the hydraulic cylinder is not operating, and the lever is turned off when the hydraulic cylinder is operating. Since a safety mechanism with a switch that disables the operation of the molding machine is provided, the lever turns off the switch when the hydraulic cylinder is operating, so even if the molding machine is accidentally turned on by mistake. The molding machine is never operated,
The safety can be secured.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a press forming machine according to the present invention.

FIG. 2 is an explanatory diagram showing a clogging elimination operation of a die and a punch.

[Explanation of symbols]

1 Press forming machine 3 dies 4 Ram 5 punches 6 crankshaft 7 crank pins 8 connection rod 9 connecting pins 21 Hydraulic cylinder (push-up means) 23 lever 24 switches

Claims (2)

[Claims] 1. A punch is disposed on the front surface of a die and a ram which moves forward and backward facing the die, and a forward movement of the ram press-forms a material between the punch and the die to form a molded product of a predetermined shape. In the forging machine, the ram is connected to the crank pin of the crank shaft that is eccentrically rotated by the drive shaft provided on the machine base via the connection rod and the connecting pin, and the ram reciprocates by the rotation of the crank pin. On the other hand, in the lower part near the center of the crank pin when the crank pin and the connection rod are in a substantially straight line, a push-up means for pushing the connecting portion of the connection rod and the crank pin upward is provided. ,
When clogging occurs due to overpressure on the die and punch, the ram is forcibly retracted by swinging the crankpin upward through the connection rod by the push-up means via the connection rod, and clogging due to overpressure on the die and punch. A press forming machine characterized by being configured to eliminate the above. 2. The push-up means includes a cylinder, and a piston is provided with a lever, and a lever is provided near the lever when the cylinder is not operated to allow the molding machine to operate and when the cylinder is operated. The press molding machine according to claim 1, further comprising a safety mechanism including a switch that disables the operation of the molding machine when the lever is turned off.