JP6776877B2 - Forging press scale recovery device - Google Patents

Description

The present invention relates to a scale recovery device for a forging press that recovers the scale peeled off from the work when the work is press-formed by a vertical die in hot forging.

In hot forging, a work (material) heated to a high temperature such as 1200 ° C. to 1250 ° C. is formed into a predetermined shape by a forging press. At that time, the surface of the work is oxidized to generate scale, and when molded by a forging press, the scale is peeled off from the surface of the work and the scale is scattered on the lower mold and its surroundings. If the scale scatters on the lower mold and its surroundings, it takes time to clean because the operator used an air blow, a broom, a shovel, etc. to remove the scale accumulated on the lower mold and its surroundings when replacing the die set. It was.
Further, when the scale mixed with the release agent is deposited in the press, the inside of the press becomes dirty, which causes equipment trouble in the vicinity of the press, and there is a problem that maintainability and working environment are deteriorated.

In order to prevent such deterioration of the working environment, the technique described in Patent Document 1 has been proposed as another method for cleaning the lower mold and the oxide scale scattered around the lower mold. In this document, the table on which the gold pad (lower mold) is installed is temporarily moved from the press bed, water is sprayed on the moving side to wash away the scale on the table, and this scale and water are received by the recovery device. A method for separating the scale from water and collecting it is described.

Japanese Unexamined Patent Publication No. 05-092231

The scale cleaning method of Patent Document 1 requires a recovery device for separating the scale and water, and further, since the recovery device is installed underground, there is a problem that the burden on equipment cost and maintenance becomes large.
The present invention has been made to solve the above problems, and provides a scale recovery device for a forging press that efficiently recovers the oxide scale peeled from the work during press molding and automatically recovers the oxide scale during production. The purpose is to make it possible.

In order to solve the above problems, the scale recovery device of the invention of claim 1 is a scale recovery device of a forged press that recovers the scale peeled off from the work when the work is pressed by the upper and lower molds, and the upper mold and the lower mold. An upper mold cover and a lower mold cover that surround each mold, an air injection means that is provided outside the press and injects air from the outside of the press through the upper mold cover into the upper mold cover, and an air injection means that is provided on the upper mold cover. An air injection port for injecting air sent from the air injection means into the upper mold cover and an discharge port provided in the lower mold cover and discharging scale peeled from the work during press molding to the outside of the press. And, the negative pressure means provided outside the press to make the inside of the lower mold cover negative pressure from the outside of the press through the discharge port of the lower mold cover, and the scale peeled from the work are collected in a container provided outside the press. The air injection means has a scale recovery container, and when the upper mold moves to the vicinity of the bottom dead point, the upper mold cover and the tip portion of the lower mold cover overlap each other and the inside of the cover is sealed. At the same time as injecting air into the inside of the cover, the inside of the cover is made negative pressure by the negative pressure means, so that the scale is discharged to the scale recovery container provided outside the press.

Further, according to the invention of claim 2, the upper mold cover and the lower mold cover are each cylindrical, the air injection port is provided in the tangential direction of the inner circumference of the upper mold cover, and the discharge port is the lower mold cover. It is characterized in that it is provided in the tangential direction of the inner circumference.

(Action)
According to the invention of claim 1, when the work is press-molded by the upper and lower molds, the tip portions of the upper mold cover and the lower mold cover overlap each other to seal the inside of the cover, and the inside of the cover overlaps with the air injection means. By injecting air, the air discharges the scale inside the cover to the discharge port provided on the lower cover. The scale sent to the discharge port is further sucked by the negative pressure means and collected in the scale collection container. In this case, the scale adhering to the work is blown off by the air pressure generated by the air injection from above, and the scale separated from the work is collected by the negative pressure by the negative pressure means. Therefore, the scale is collected at the same time as the work is formed. Can be done. Since this series of steps is repeated for each work forming, the scale inside the press can be automatically collected without human intervention during production without scattering the scale around the press. Further, as in the invention of claim 2, the upper mold cover and the lower mold cover have a cylindrical shape, the air injection port is provided in the tangential direction of the inner circumference of the upper mold cover, and the discharge port is tangential to the inner circumference of the lower mold cover. If provided, the air injected from the air injection port swirls inside the cover, and the scale separated from the work is discharged to the discharge port provided on the lower cover, so the air injection port and discharge port The ability to collect the scale is further improved compared to installing each in a position other than the above.

According to the present invention, the scale that is peeled off from the work during press molding can be automatically collected without being scattered around the lower mold and without human intervention during production. Moreover, since the recovered scale recovers the dry scale before being mixed with the mold release agent, a separation / recovery device for separating the mold release agent and the scale after scale recovery becomes unnecessary.

FIG. 1 is a configuration diagram of a scale recovery device for a forging press according to an embodiment of the present invention, and is a diagram showing a situation at the start of hot forging. FIG. 2 is a configuration diagram of a scale recovery device for a forging press according to an embodiment of the present invention, and is a diagram showing a scale recovery status during hot forging. FIG. 3 is a plan view seen from the AA cross section of FIG. FIG. 4 is a configuration diagram of a scale recovery device for a forging press, which is another embodiment of the present invention, and is a diagram showing a scale recovery situation during hot forging.

The scale recovery device for the forging press used in one embodiment of the present invention will be described below with reference to FIG.
The scale recovery device of the forging press 1 shown in FIG. 1 is provided with an upper mold cover 4 that surrounds the circumference of the upper mold 2 on the circumference and a lower mold cover 5 that surrounds the circumference of the lower mold 3 on the circumference. There is. The upper cover 4 and the lower cover 5 have a cylindrical shape as shown in FIGS. 1 and 3, respectively. Further, an air injection port 10 for ejecting air is installed inside the upper cover 4. As shown in FIG. 3, the air injection port 10 is preferably provided in the tangential direction of the inner circumference of the upper mold cover 4. The air injection port 10 is connected to the air compressor 6 via a compressed air pipe 7. An electromagnetic valve 8 is installed in the compressed air pipe 7, and the electromagnetic valve 8 is opened and closed by the control device 9. The control device 9 is connected to a press drive device (not shown), and when the press drive device lowers the upper die 2 near the bottom dead center, the control device 9 opens the electromagnetic valve 8 and press drive device. When the upper die 2 is raised above the vicinity of the bottom dead center, the control device 9 controls the electromagnetic valve 8 so that the electromagnetic valve 8 is “closed”.

A discharge port 13 for discharging the scale to the outside of the press 1 is provided below the lower cover 5. As shown in FIG. 3, the discharge port 13 is preferably provided in the tangential direction of the inner circumference of the lower mold cover 5. The discharge port 13 is connected to the scale collection container 12 that collects the scale via the duct 14. The scale collection container 12 is also connected to the air suction device 11 via a duct 14'which is different from the duct 14 connected to the discharge port 13. The scale recovery container 12 is a container having a hollow inside, and is preferably made of a metal that can withstand high heat.
The air suction device 11 is connected to the inside of the lower mold cover 5 via ducts 14, 14', scale recovery container 12, and discharge port 13, and can discharge the scale inside the lower mold cover 5. The air suction device 11 may be, for example, a vacuum cleaner or a vacuum pump.

Next, the scale recovery method by the scale recovery device of the forging press of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 shows the state at the start of hot forging of the forging press 1, the upper die 2 is arranged at the top dead center, and the lower die 3 is set with a work W heated to a high temperature of, for example, 1200 to 1250 ° C. ing. At this time, there is a gap between the upper mold cover 4 and the lower mold cover 5 for setting the work W on the lower mold 3.

From this state, the upper die 2 is lowered by a press drive device (not shown) to form the work W. When the upper die 2 descended near the bottom dead center, the lower portion of the upper die cover 4 and the upper portion of the lower die cover 5 overlapped as shown in FIG. 2, and the upper die 2 and the lower die 3 were overlapped, that is, overlapped. The insides of the upper cover 4 and the lower cover 5 are sealed. When the inside of the cover is sealed in this way, the control device 9 controls the solenoid valve 8 so that the solenoid valve 8 is opened from the closed state, and the air compressor 6 is transferred to the upper die 2 via the compressed air pipe 7. Air is injected into the cover from the installed air injection port 10. The air injected from the air injection port 10 is drawn in by the negative pressure of the air suction device 11 operated at the same time, and the scale is sent out to the discharge port 13. At this time, as shown by the one-point chain line in FIGS. 2 and 3, a swirling flow can be generated inside the cover, and the scale can be efficiently sent out to the discharge port 13. The scale flowed through the discharge port 13 is further flowed through the duct 14 by the negative pressure of the air suction device 11 and collected in the scale recovery container 12.
After press molding, the upper die 2 is raised by a press drive device (not shown), and when the upper die 2 is raised above the vicinity of the bottom dead center, the solenoid valve 8 is closed by the control device 9 and the air in the upper die cover 4 is closed. The injection stops.

Next, a scale recovery device for a forging press, which is another embodiment of the present invention, will be described with reference to FIG. The difference between the first embodiment (FIG. 2) and the present embodiment (FIG. 4) described above is that the air suction device is the ejector gun 20. In FIG. 4, the ejector gun 20 is installed above the scale recovery container 12, and high-pressure air is passed through the air supply pipe 21 of the ejector gun 20 to exhaust the air in the scale recovery container 12, while the scale recovery container 12 The inside of the press 1 is made negative pressure through the duct 14 and the exhaust port 13. By doing so, it is possible to obtain the effect that the installation space can be narrowed as compared with the one embodiment described above. As the ejector gun 20, for example, a wonder gun (trade name, manufactured by Osawa & Company) can be used. Others are the same as in the above embodiment.

As a case other than the above embodiment, the air injection port 10 can be installed at a position other than the tangent line on the inner circumference of the upper cover 4, and the discharge port 13 can be installed at a position other than the tangent line on the inner circumference of the lower cover 5. Is. Even in this case, a certain amount of scale can be recovered, and efficient scale recovery is performed by optimizing the mounting positions of the air injection port 10 and the discharge port 13 as appropriate according to the scale recovery capacity required for the forging press to be used. Can be a device capable of Further, the shapes of the upper cover 4 and the lower cover 5 can be appropriately designed to be polygonal columns or the like according to the shape of the press in addition to the cylindrical shape described in the above embodiment.

1 Forging press 2 Upper mold 3 Lower mold 4 Upper mold cover 5 Lower mold cover 6 Air compressor (air injection means)
7 Compressed air piping 8 Solenoid valve 9 Control device 10 Air injection port 11 Air suction device (negative pressure means)
12 Scale recovery container 13 Discharge port 20 Ejector gun (negative pressure means)
21 Air supply piping
W work (material)

Claims (2)

It is a scale recovery device for forging presses that recovers the scale peeled off from the work when the work is pressed with the upper and lower molds.
The upper and lower covers that surround the upper and lower molds,
An air injection means provided outside the press and injecting air from the outside of the press through the upper cover to the inside of the upper cover.
An air injection port provided on the upper mold cover and for injecting air sent from the air injection means into the upper mold cover.
An outlet provided on the lower mold cover and discharging the scale peeled off from the work during press molding to the outside of the press.
Negative pressure means provided outside the press and making the inside of the lower mold cover negative pressure from the outside of the press through the discharge port of the lower mold cover.
It has a scale recovery container provided outside the press and for recovering the scale peeled from the work.
When the upper mold descends to the vicinity of the bottom dead center, when the upper mold cover and the tip portion of the lower mold cover overlap each other and the inside of the cover is sealed, air is injected into the cover from the air injection means. At the same time, the scale recovery device of the forging press is characterized in that the scale is discharged to the scale recovery container provided outside the press by making the inside of the cover negative pressure by the negative pressure means. The upper mold cover and the lower mold cover each have a cylindrical shape, the air injection port is provided in the tangential direction of the inner circumference of the upper mold cover, and the discharge port is provided in the tangential direction of the inner circumference of the lower mold cover. The scale recovery device for the forging press according to claim 1.

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