JPS625785Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a lubricating device that utilizes the elasticity of a stripper installed in a punching machine or other punching machine.

[Conventional technology]

As is well known, punching machines and the like are equipped with a stripper to make it easier to release the punch from the workpiece during the punching process.

By the way, if the processed material is a thin sheet material like sheet metal,
Burrs are formed below the periphery of the punched hole, and even if a stripper is present, it not only puts a load on the punch's removal force, making it difficult to remove it, but also damages the punch.

Therefore, in the past, an operator manually lubricated the punch at regular intervals.

However, manual lubrication is very troublesome, so it is possible to connect a lubrication pipe to the oil tank, place the end of the pipe near the punch, and constantly lubricate automatically using head pressure from the oil tank. Furthermore, as disclosed in Japanese Utility Model Application Publication No. 55-55235, there have been proposals that incorporate an automatic lubrication mechanism that automatically lubricates a certain amount of lubrication in conjunction with the vertical movement of the press. Ta.

[Problem that the invention attempts to solve]

However, systems that connect an oil supply pipe to an oil tank and use head pressure to automatically supply oil have a very simple structure and are readily available, but they have problems in controlling the amount of oil and are prone to overfilling. As a result, there were drawbacks such as staining the processed material with the oil and leaving the area around the press die covered with oil. Therefore, the latter was developed to eliminate such excessive lubrication and automatically lubricate the appropriate amount of oil at all times.

The automatic oil supply mechanism disclosed in this Japanese Utility Model Publication No. 55-55235, as shown in FIG. A spring is inserted in between, and the opening is normally closed by this spring. When the operating rod provided on the lower valve element is pushed, the valve element opens the lower opening and the oil in the cylinder is drained there. It is designed to be pushed out from the

Therefore, as shown in Fig. 1, with the oil supply pipe connected to the upper opening and the operating rod of the lower valve body protruding from the lower end of the cylinder, the whole assembly is attached to the knockout plate or punch holder of the press. By incorporating this into the
It is configured to lubricate a certain amount of oil. In other words, it is configured as a plunger type pump.

However, although there is an advantage that a certain amount of lubrication can be performed automatically and continuously, the lubrication outlet is
As shown in the figure, since it is located on the bottom surface, there is a drawback that oil cannot be directly applied to the contact surface between the important workpiece, that is, the sheet metal and the punch.

Therefore, in order to overcome this drawback, as shown in Figure 4, a device was devised in which the punch is surrounded by a cylindrical sponge, and the discharged oil is soaked in the sponge and applied to the outer circumference of the punch. Proposed.

However, the automatic oil supply mechanism made of this plunger type pump is complicated in its mechanism.
In addition, in the case where a sponge is arranged around the outer circumference of the punch and oil is supplied through this sponge, it is troublesome to set the operating rod installed on the lower valve body of the mechanism.
Moreover, it has the disadvantage that the structure of the part that interacts with the sponge is more complicated.

In addition, the oil contained in the sponge is not completely applied to the outer circumferential surface of the punch, and flows out from the outer circumference of the sponge to the area around the die, including the stripper, which can stain not only the processing machine but also the surrounding area. There are drawbacks to this.

In any case, conventional automatic lubrication devices have advantages and disadvantages, and there is a need for the development of a further improved lubrication device.

In view of these circumstances, the present invention focuses on the stripper of a punching machine or press machine, with the aim of making the operation of the punching machine or press machine smooth and efficient, and since the stripper is made of an elastic material. ,
The present invention utilizes the elastic deformation to form a so-called lubrication pump in the stripper, and provides an automatic lubrication device that can lubricate the punch each time it is operated.

[Means for solving the problem]

The stripper on the outer periphery of the punch in the punching machine is made of an elastic material, an oil storage chamber is formed inside the thick cross section of the stripper, and an oil supply path is provided that communicates with the upper part of the oil storage chamber and opens at the outer periphery of the stripper. A check valve is provided inside the oil supply passage, and an oil discharge passage having an oil spout opening corresponding to the outer circumferential surface of the punch is provided at the bottom of the oil storage chamber, and the inside of the lower part of the stripper located below the oil spout is provided. A pleated seal portion is provided on the circumferential surface of the punch to make sliding contact with the outer circumferential surface of the punch, so that oil can be automatically applied to the required locations by utilizing the elastic force of the stripper of the thick punching machine.

[Effect]

Since the present invention is configured as described above, the oil stored inside the stripper is automatically discharged onto the outer peripheral surface of the punch as the stripper is compressed in each punching process.

Since a pleated seal portion is provided on the inner peripheral surface of the lower end of the stripper, the discharged oil is held by this seal portion and does not drip downward. Therefore, the processed material, die, and other surrounding areas are not contaminated with oil.

〔Example〕

Hereinafter, the present invention will be explained in more detail based on examples. In FIG. 1, 1 is a press ram;
2 is a stripper suspended from this press ram 1;
3 is a punch and 4 is a die.

The material of the stripper 2 is a rubber material mainly made of urethane rubber.

There are various types of punches 3, such as round and square shapes, and the stripper 2 is similarly molded to match the shape of the punch 3, such as round and square shapes.

Reference numeral 6 denotes an oil reservoir formed within the thick cross-sectional portion of the stripper 2 , and reference numeral 7 denotes an oil supply passage which communicates with the upper portion of the oil reservoir 6 and has an opening located on the outer circumferential surface of the stripper 2 .

Reference numeral 8 denotes a check valve provided on the oil storage chamber 6 side of this oil supply path 7, and has the role of preventing oil in the oil storage chamber 6 from being discharged to the outside.

Reference numeral 7' denotes an oil discharge passage which also communicates with the lower part of the oil storage chamber 6 and has an oil discharge port opened at a position corresponding to the outer circumferential surface 10 of the punch 3.

The above-mentioned stripper 3 and the oil supply passage 7 and oil discharge passage 7' including the oil storage chamber 6 formed in its thick cross section are either integrally molded using a mold or the like during the processing process of the urethane rubber material, or It is constructed by mechanically joining after hollowing out.

Further, if the oil discharge passage 7' is formed so as to function as an orifice having a smaller diameter than the upper oil supply passage 7, there is no need to provide a valve.

That is, if the stripper 2 is made thin, oil will not drip when the stripper 2 is compressed and not subject to deformation.

Therefore, if the oil storage chamber 6 is filled with oil using a lubricator in advance, oil will always be stored in the oil storage chamber 6.

Reference numeral 9 denotes a pleated seal portion provided on the inner circumferential surface of the stripper 2 below the oil spout 7', and is brought into sliding contact with the outer circumferential surface of the lower end of the punch 3.

FIG. 2 shows the details, and it constitutes a kind of labyrinth seal. Therefore, the oil discharged from the oil spout collects in the labyrinth-shaped concave portion 11 of the seal portion and drips downward, so that it does not contaminate the die or the like as well as the sheet metal that is the processed material.

FIG. 3 shows an oil supply passage 7 communicating with the upper part of the oil storage chamber 6.
This figure shows the mounting part of the check valve 8 installed in the oil storage chamber 6. As shown in the figure, it is made of the same material as the component of the stripper 2, that is, a part of the ceiling of the oil storage chamber 6 is cut out to form a flapper type valve. You can.

FIG. 4 shows an embodiment in which the seal portion 9' is formed of a ring-shaped material made of porous sponge or porous metal, and by impregnating the seal portion 9' with oil, A configuration is shown in which the outer circumferential surface of the punch 3 is continuously supplied with oil.

Note that this porous body is preferably an elastic body, but may be a sintered metal or the like in some cases. As for the elastic material, urethane foam or sponge type materials are good.

Furthermore, in order to eliminate the trouble of lubricating the oil storage chamber 6 from the oil supply path 7, a flexible pipe 12 connected to the oil tank T is connected to the oil supply path 7, so that the oil in the oil storage chamber 6 is drained and the oil storage chamber 6 is drained. When the chamber 6 becomes a vacuum state, oil may be sucked into the oil storage chamber 6 from the oil tank T.

[Effect of idea]

According to the present invention described above, the volume in the oil storage chamber is compressed using the elastic deformation of the stripper, so to speak, and the required oil from the oil discharge path is sprayed onto the outer peripheral wall of the punch, and the punch is removed. In addition to making the operation smooth and efficient, the oil sprayed on the punch collects in the seal and is temporarily retained to constantly lubricate the outer peripheral wall of the punch.

Furthermore, since the stripper is elastically deformed each time the punch performs a punching operation, oil is always sprayed onto the punch each time the punch performs the punching operation. Moreover, the appropriate amount of oil is automatically applied, and there is no possibility of over-lubricating and staining the sheet metal or drilling table top with oil. Furthermore, if an oil tank is connected to the oil supply path, suction and discharge of oil will be repeated for each operation, which is extremely labor-saving, and the punch can be lubricated without requiring driving force. Therefore, the punch removal operation after punching is good, and wear and tear on the punch is also prevented. Furthermore, since the stripper constituting the main part of the device is made of a material that is easy to process, it can be manufactured by integrally forming it with a mold during molding, or by hollowing it out and mechanically joining it. Therefore, it is possible to keep the cost low with a simple configuration. Furthermore, since the stripper is replaceable, it can be used as a lubricating device for each part of the main body punching machine or attached machines, and has high industrial value.

Furthermore, the seal portion may be formed of a porous body made of sintered metal having an appropriate porosity, and may be formed to protrude in the form of pleats on the stripper. is obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a central vertical sectional view showing the main parts of the present invention in a punching machine, FIG. 2 is a partially enlarged view of FIG. 1 showing the sealing part, and FIG. The figure shows the first oil supply path equipped with a check valve.
A partially enlarged view of the figure, FIG. 4 is a central vertical sectional view similar to FIG. 1 showing another embodiment. 1... Press Ram, 2... Stripper, 3...
Punch, 4... Die, 5... Sheet metal, 6... Oil storage chamber, 7... Oil supply path, 7'... Oil discharge path, 8... Check valve, 9... Seal portion, 9'... Porous hole A sealing portion made of a solid body, 10...outer periphery of the punch, 11... recessed portion of the sealing portion, 12... flexible pipe.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The stripper on the outer periphery of the punch in the punching machine is made of an elastic material, and an oil storage chamber is formed inside the thick section of the stripper, communicating with the upper part of the oil storage chamber, and the stripper is made of an elastic material. An oil supply passage that opens on the outer periphery of the punch is provided, a check valve is provided inside the oil supply passage, and an oil discharge passage that has an oil discharge port that opens corresponding to the outer circumferential surface of the punch is provided at the bottom of the oil storage chamber. On the inner peripheral surface of the lower part of the stripper located below the oil port,
A lubricating device that utilizes the stripper pressure of a punch machine and is characterized by having a pleated seal portion that slides into contact with the outer peripheral surface of a punch. (2) An oil supply device utilizing the elasticity of a stripper as set forth in claim 1 of the utility model registration, in which the check valve is made of the same material as the component of the stripper. (3) A lubricating device utilizing the stripper elasticity of a punching machine according to claim 1, wherein the pleated seal portion is made of a porous elastic metal or a sponge member.