JPH11319984A - Punch press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct fluid injection as required, to eliminate unnecessary fluid injection and to improve a life of a detection means. SOLUTION: The press uses a punch press die 3 having a flow passage 12 for falling slag by air-injecting therein. A ram 6 has a flow passage 15 to supply air with communication the flow passage 12 at the time of striking a punch die 3, inside it. A fluid supply control means 19 to control fluid supply to the flow passage of the ram 6 and a detection means 21 to detect the contact between the ram 6 and the punch die 3 are arranged. The detection means 21 is arranged so that the ram 6 is not in contact with the punch die 3 at a position where the ram 6 reaches the punch die 3. The fluid supply control means 19 conducts fluid supply to the ram by the detection means 21 when contact is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch press having a function of discharging a fluid from a punch die to forcibly drop slag generated during punching.

[0002]

2. Description of the Related Art Conventionally, in order to prevent a punched slag from floating from a die when punching and forcibly drop the slag, the slag is communicated with a ram and a punch die. One in which a compressed air flow path is formed has been proposed. The flow path in the ram communicates with the flow path formed in the ram guide when the ram descends to the bottom dead center, and blows compressed air from the lower end of the punch die. The slag is forcibly dropped by this air injection output, and the slag is prevented from floating due to the subsequent rise of the punch die. When supplying compressed air to the ram, sensors that are provided on the ram detect that the ram has come into contact with the punch mold due to its lowering in order to eliminate unnecessary fluid ejection, and the valve is responded to the detection signal to open the valve. This is done by controlling. As the sensor, a contact detection switch by energization is used.

[0003]

However, the sensor provided on the ram for detecting contact with the punch die is hit with the punch die every time the punch operation is performed, so that a satisfactory life can be obtained. difficult.

An object of the present invention is to provide a punch press which can perform fluid ejection only when necessary, eliminates unnecessary fluid ejection, and improves the life of the detecting means. It is another object of the present invention to prevent the ram and the punch die from being stained with a fluid for contact detection. Still another object of the present invention is to simplify the configuration of a fluid supply system for detecting the forced drop of the slag and the contact of the ram.

[0005]

A punch press according to the present invention is a punch press in which a punch having a flow path for dropping a slag by discharging a fluid therein can be mounted. A ram having a flow path therein for supplying a fluid in communication with the flow path when hitting the ram, a fluid supply control means for controlling the supply of fluid to the flow path of the ram, and the ram having a punch mold. The ram and the punch die are arranged so as not to be in contact with the ram and the punch die facing the contact position, and a detecting means for detecting that the ram has contacted the punch die is provided. The fluid supply control means is configured to supply the fluid to the flow path of the ram when the detection means detects that the ram has come into contact with the punch die. According to this configuration, in each punching operation of hitting the punch die with the ram, when the detection unit detects that the ram has come into contact with the punch die, the fluid supply control unit responds to the detection signal to detect the ram. The fluid supply to the flow path is performed. By this fluid supply, the fluid is discharged from the punch die, and the slag is forcibly dropped at the discharge pressure. In this case, since the fluid is supplied by detecting the contact between the ram and the punch die, the fluid can be discharged only when necessary, and unnecessary fluid discharge can be eliminated. In addition, the detection means,
Since the ram faces the position where it contacts the punch mold and is placed in non-contact with the ram and punch mold, the load and vibration due to the ram strike are not transmitted to the detection means while enabling reliable detection, It is possible to prevent the life of the detection means from being shortened by a load or vibration. Therefore, the detecting means has a long life.

In the present invention, the detecting means may blow air toward a position where the ram comes into contact with the punch die, and may detect a blowing pressure of the air. The detecting means always blows air, for example, toward the position where the ram contacts the punch die. In this case, while the ram is away from the punch die, the resistance of the air ejection is small, and the ejection pressure maintains a low value. When the ram contacts the punch mold, the ejection pressure is increased because the ejection path is blocked by the ram at a position immediately after the ejection port. By the increase of the ejection pressure, the contact of the ram with the punch die is detected. Even if air is constantly ejected from the detection means, only the amount of air necessary for detection is sufficient, so that there is no problem of wasteful air ejection unlike the case where air is always ejected to drop slag. Further, since the ejected fluid is air, it does not contaminate the ram or the punch die.

In the present invention, the fluid discharged from the punch die may be air, and the air discharged from the punch die and the air of the detecting means may be supplied from the same air source. In this configuration, the air for forced dropping of the slag and the air for contact detection are obtained from a common air source, so that the configuration of the entire apparatus is simplified.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. A punch mold 3 and a die mold 4 are respectively set on the upper and lower mold holding means 1, 2, and the plate material W on the table 5 is placed between the punch mold 3 and the die mold 4 by the plate material moving means. (Not shown). The upper and lower mold holding means 1 and 2 are turrets installed coaxially with each other, and a punch mold 3 and a die mold 4 are installed at a plurality of positions in the circumferential direction. A ram 6 is set up and down along a ram guide 7 at predetermined punch positions that can be indexed by the upper and lower mold holding means 1 and 2, and the ram 6 is driven up and down by a punch driving device (not shown). . The punch driving device may be of a hydraulic type or a mechanical type.

The punching die 3 includes a cylindrical guide member 8 also serving as a stripper, in which a shearing blade 9 is fitted in a vertically movable manner, and a first return spring 10 which is an elastic body is provided. Have been. Further, the punch die 3 is provided with a shearing blade 9.
Is formed at the center of the flow path 12, which is a hole penetrating vertically. The first return spring 10 supports the shearing blade 9 with respect to the guide member 8 in a raised state. Shear blade 9
Has an upper end protruding above the guide member 8. The first return spring 10 is provided between a spring receiver 9a provided at the upper end of the shearing blade body 9 and a flange portion 8a provided at the upper end of the guide member 8. Punch mold 3
Is fitted on the outer periphery of the guide member 8 into the punch holding hole 13 of the mold holding means 1 made of a turret so as to be able to move up and down. Further, the punch die 3 is supported by the punch holding means 1 in an ascending state by a second return spring 11 which is an elastic body interposed between the flange portion 8a and the upper surface of the punch holding means 1.

The second return spring 11 is a first return spring 1
The spring constant is smaller than 0. Therefore, when the punch die 3 is pushed from above by the ram 6, the second return spring 11 is first compressed and the entire punch die 3 descends,
The work W is pressed by the lower surface of the guide member 8. After this, the first
Is compressed, the shear blade 9 descends with respect to the guide member 8, and punches a hole in the plate W. When the ram 6 reaches the bottom dead center and starts to move upward, the shearing blade body 9 moves upward by the restoring force of the first return spring 10. Shear blade 9
Is released from the punch hole of the plate material W, the second return spring 11
The restoring force causes the entire punch die 3 to rise.

When the ram 6 strikes the punch 3,
A channel 15 for supplying a fluid in communication with the channel of the punch die 3
Inside. The channel 15 has an outlet on the lower surface of the ram 6 and an inlet on the side surface. This channel 15
The inlet is connected to an air source 18 as a fluid supply source via a flow path 16 provided in the ram guide 7 and a flow path 17 formed of a pipe. The flow path 16 of the ram guide 7 is
The ram 6 communicates with the flow path 15 of the ram 6 through a communication groove 16a having a width in the elevating direction so that the ram 6 can communicate with the inlet of the flow path 15 over an arbitrary vertical range or a predetermined vertical range. It is made to let. The communication groove 16a
Instead, the flow path 15 of the ram 6 and the flow path 16 (or the flow path 17) on the upstream side thereof may be communicated by a flexible pipe. The fluid supply control means 1 is provided in the flow path 17 of the pipe.
Nine valves 20 are provided. The valve 20 includes an electromagnetic valve such as an electromagnetic on-off valve.

A detecting means 21 for detecting that the ram 6 has come into contact with the punch die 3 is provided facing the position where the ram 6 comes into contact with the punch die 3. This detecting means 21
The ram 6 and the punch die 3 are arranged in a non-contact manner, and are installed, for example, on a frame (not shown) on which a ram guide 7 is installed. The detecting means 21 includes a nozzle for ejecting air and an ejection pressure detection sensor for detecting the back pressure of the nozzle, which is the ejection pressure. The air supply port to the nozzle is connected to the air source via a flow path 22. 18. A variable throttle valve 2 for adjusting the ejection pressure is provided in the flow path 22.
3 are provided. The ejection pressure detection signal of the detection means 21 is taken out as a voltage value or the like.
It is connected to a valve 20 of the fluid supply control means 19 via a control circuit 24 such as an amplifier. The control circuit 24
The ejection pressure detection signal may be simply amplified, or signal processing may be performed such that the valve 20 opens at a predetermined timing in response to the ejection pressure detection signal.

The operation of the above configuration will be described. The ram 6 is lowered, the punch die 3 is hit, and the punch die is lowered, so that the plate material W is punched. When the ram 6 is lifted, the punch die 3 is lifted and returned as described above. In the process of repeating this punching operation, the detecting means 21
Monitors the contact of the ram 6 with the punch die 3 by constantly discharging the air supplied from the air source 18. In this case, while the ram 6 is separated from the punch mold 3, the resistance of the air ejection is small, and the ejection pressure maintains a low value. When the ram 6 comes into contact with the punch die 3 as shown by a chain line in FIG.
Since the nozzle 1 is obstructed by the ram 6 immediately after the outlet, the ejection pressure increases. By the increase of the ejection pressure, the contact of the ram 6 with the punch die 3 is detected. By detecting this contact, the valve 20 of the fluid supply control means 19
Opens. As a result, the compressed air of the air source 18
It is supplied to the flow path 12 in the punch die 3 through the flow path 15 inside, and is ejected from the tip of the punch die 3. By this air ejection, slag (not shown) generated by punching is forcibly dropped. The air ejection period is appropriately set by the fluid supply control unit 19. For example, fluid supply control means 1
Reference numeral 9 denotes a state in which the valve 20 is opened only during a period in which the detection means 21 is on, and the ram 6 rises and the punch mold 3 is opened.
The air supply is stopped when the air conditioner leaves.

According to this punch press,
Since the air supply is performed by detecting the contact between the ram 6 and the punch mold 3, air can be ejected only when necessary, and unnecessary air ejection can be eliminated. In addition, since the detecting means 21 is disposed in a position where the ram 6 comes into contact with the punch die 3 and is not in contact with the ram 6 and the punch die 3, the detection means 21 can reliably detect the ram 6. The load and the vibration due to the beating are not transmitted to the detecting means, and the shortening of the life of the detecting means 21 due to the applied load and the vibration is prevented. Therefore, the detecting means 21 has a long life. Even if the air is constantly ejected from the detection means 21, only the amount of air necessary for the detection is sufficient, so that there is no problem of waste of the air ejection unlike the case where the air is always ejected to drop the slag. Further, since the ejected fluid is air, the ram 6 and the punch mold 3 are not contaminated.

The detecting means 21 may be a transmission type or reflection type photoelectric switch, or may be a proximity switch for detecting a dog (not shown) provided on the ram 6, for example. In this embodiment, since the detection means 21 for detecting by air ejection is used, unlike the case where a transmission type photoelectric switch is used, for example, it is sufficient to dispose it on only one side of the ram 6, and it is easy to secure the installation position. Further, there are advantages that the detection reliability is higher than that of the reflection type photoelectric switch, and that unlike the proximity switch, there is no need to provide a dog on the ram 6.

[0016]

According to the punch press of the present invention, the fluid supply control means for controlling the supply of fluid to the flow path of the ram, and the ram and the punch die are not in contact with each other when the ram comes into contact with the punch die. Detecting means for detecting that the ram has come into contact with the punch mold, wherein the fluid supply control means detects the ram by contact with the punch mold by the detecting means. Since the fluid is supplied to the flow channel, the fluid can be discharged only when it is necessary to force the slag to drop, so that unnecessary fluid discharge can be eliminated and the life of the detecting means can be improved. Therefore,
Even when used for a long period, fluid can be discharged at an appropriate timing. In the case where the detection means is for discharging air toward a contact position of the ram with the punch die and detecting the pressure of the air, the ram or the punch die is contaminated with a fluid for contact detection. Nothing. When the fluid discharged from the punch die is air, and the air discharged from the punch die and the air of the detecting means are supplied from the same air source, the slag is forcibly dropped and the ram is not moved. A simple fluid supply system for contact detection is sufficient.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a partial cross-sectional view of a punch press according to an embodiment of the present invention and a conceptual configuration diagram of a flow path system and a control system thereof.

[Explanation of symbols]

 1, 2 ... mold holding means 3 ... punch mold 6 ... ram 7 ... ram guide 12 ... flow path in punch mold 15 ... flow path in ram 16, 17 ... flow path 18 ... air source 19 ... fluid supply Control means 20 ... Valve 21 ... Detecting means 22 ... Flow path 23 ... Throttle valve 24 ... Control circuit

Claims (3)

[Claims] 1. A punch press capable of mounting a punch die having a flow path for dropping a slag by discharging a fluid, wherein the punch press communicates with the flow path when the punch die is beaten. A ram having a flow path for supplying a fluid therein, fluid supply control means for controlling the supply of fluid to the flow path of the ram, and the ram and the punch metal facing the position where the ram contacts a punch die. It is placed in non-contact with the mold,
Detecting means for detecting that the ram has come into contact with the punch mold, and the fluid supply control means, when the detecting means detects that the ram has come into contact with the punch mold, the fluid supply control means A punch press adapted to supply fluid. 2. The punch press according to claim 1, wherein said detecting means blows air toward a position where said ram comes into contact with a punch die, and detects a blowing pressure of said air. 3. The punch press according to claim 2, wherein the fluid discharged from the punch die is air, and the air discharged from the punch die and the air of the detecting means are supplied from the same air source.