JP7534769B2 - Scale recovery device - Google Patents

Description

The technology disclosed herein belongs to the technical field of scale recovery devices that recover scale generated when a workpiece is forged using a forging press.

It has been known that when a workpiece is hot forged, the surface of the workpiece is oxidized to produce scale, which peels off and flies away from the workpiece when the workpiece is pressed. When scale accumulates, workers are required to clean it up, which reduces workability. To prevent this, a device for collecting scale has been proposed.

For example, Patent Document 1 discloses a scale recovery device for a forging press, which includes an upper die cover and a lower die cover that surround the upper die and lower die of a press, an air injection means that is provided outside the press and injects air from outside the press into the inside of the upper die cover, an air injection port that is provided in the upper die cover and injects air sent from the air injection means into the inside of the upper die cover, an outlet that is provided in the lower die cover and discharges scale peeled off from the workpiece during press forming to the outside of the press, a negative pressure means that is provided outside the press and creates a negative pressure inside the lower die cover from the outside of the press, and a scale recovery container that is provided outside the press and recovers the scale peeled off from the workpiece. When the upper die descends near the bottom dead center, the tips of the upper die cover and the lower die cover overlap and the inside of the cover is sealed, and at the same time, air is injected from the air injection means into the inside of the cover and the negative pressure means creates a negative pressure inside the cover, thereby discharging the scale into the scale recovery container provided outside the press.

JP 2018-99722 A

However, in the scale recovery device described in Patent Document 1, when the upper die descends near the bottom dead center, the tips of the upper die cover and the lower die cover overlap, sealing the inside of the cover, so the worker cannot confirm the moment when the forging press processes the workpiece (the moment of impact). In forging operations, aligning the workpiece is important for improving processing accuracy, and not being able to confirm the moment of impact may result in defective processing of the workpiece. Furthermore, if the moment of impact cannot be confirmed, it is difficult to make adjustments to improve defective processing of the workpiece if it occurs.

The technology disclosed here has been developed in light of these points, and its purpose is to provide a scale recovery device that can efficiently recover scale while improving the machining accuracy of the workpiece.

In order to solve the above problems, the technology disclosed herein is directed to a scale recovery device that recovers scale generated when a workpiece is hot forged using a forging press, and is configured to include an air curtain device that is provided outside the forging press and that shields a predetermined area near the forging press with an air curtain, thereby moving the scale in the airflow direction of the air curtain, and a recovery container for recovering the scale moved by the air curtain device.

With this configuration, scale that flies off when a workpiece is machined by a forging press can be moved by the air curtain and collected in a collection container. With an air curtain, there is no need to cover the area around the forging press, so workers can actually see the moment of impact by the forging press. Therefore, the scale can be efficiently collected while improving the machining accuracy of the workpiece.

The scale collection device may further include an air blower that moves the scale toward the air curtain formed by the air curtain device.

This configuration allows the scale to move toward the air curtain, improving the efficiency of scale collection. It also prevents scale from accumulating on the press.

In the scale recovery device, the air curtain device may have an air supply device, a piping device that circulates the air discharged by the air supply device toward the upper side of the workpiece processing section of the forging press and then blows it downward to form an air curtain, and a suction device that sucks in the air that is discharged from the piping device and forms the air curtain, and a portion of the piping device may be configured to be U-shaped and open toward the forging press side when viewed from the top and bottom.

With this configuration, the area near the forging press can be surrounded by an air curtain, which can further improve the efficiency of scale recovery.

The scale collection device may be configured to include a guide member that guides the scale toward the collection container.

This configuration allows the scale to be guided to the collection container, further improving the efficiency of scale collection.

As explained above, the technology disclosed herein uses an air curtain to collect the scale, allowing the scale to be collected in a state where the worker can actually see the moment of impact by the forging press. Therefore, the scale can be collected efficiently while improving the machining accuracy of the workpiece.

FIG. 1 is a schematic diagram of a forging processing system including a scale recovery device according to an exemplary embodiment. FIG. 2 is a schematic plan view of the forging system as viewed from above. FIG. 2 is a perspective view showing an air curtain device. FIG. 4 is a partial cross-sectional view showing a guide portion of the air curtain device.

Below, an exemplary embodiment will be described in detail with reference to the drawings. In the following description, the operating direction of the forging press 2 is the up-down direction, and the side where the worker H is located with respect to the forging press 2 is referred to as the front side, and the opposite side is referred to as the rear side. In addition, when looking from the front side to the rear side, the right side is referred to as the right side, and the left side is referred to as the left side. Note that these terms, up-down, front-rear, left-right, and right-left, do not limit the directions in the actual forging processing system 1 and scale recovery device 10.

Figure 1 shows a schematic diagram of a forging system 1 including a scale recovery device 10. This forging system 1 is a system for performing hot forging, and has a forging press machine 2 for processing a workpiece W. The forging press machine 2 has an upper die 3 and a lower die 4. The upper die 3 is connected to a lifting platform, and the lower die 4 is fixed to the floor of a factory or the like. The upper die 3 is capable of moving up and down relative to the lower die 4. The lower die 4 is provided with a workpiece processing section 4a for placing the workpiece W. The workpiece W is pressed by lowering the upper die 3 with the workpiece W placed on the workpiece processing section 4a.

The forging system 1 has a scale recovery device 10 for recovering scale (oxides) scattered during forging on the opposite side of the forging press 2 from the working area of the worker H (i.e., the rear side of the forging press 2). As shown in Figs. 3 and 4, the scale recovery device 10 is attached and fixed to a frame 60 provided with casters 61. The frame 60 is movable by the casters 61. The scale recovery device 10 is also movable along with the movement of the frame 60. Note that the aforementioned "during forging" refers not only to the actual pressing of the workpiece W, but also to a series of processes related to the processing of the workpiece W, including the process of placing the workpiece W on the processing section 4a and the process of moving the workpiece W from the processing section 4a after pressing.

The scale collection device 10 is provided outside the forging press 2 and includes an air curtain device 20 that shields a specific area near the forging press 2 with an air curtain to move the scale in the airflow direction of the air curtain A, an air blower device 30 that moves the scale toward the air curtain, and a collection container 40 for collecting the scale moved by the air curtain device 20.

The air curtain device 20 has an air supply device 21 that supplies air to form the air curtain, a piping device 22 through which the air supplied from the air supply device 21 passes, and a suction device 26 that sucks in the air that has formed the air curtain. The suction device 26 and the air supply device 21 are connected via a circulation path 29, and the air sucked by the suction device 26 returns from the suction device 26 to the air supply device 21 through the circulation path 29.

The air supply device 21 is, for example, an air compressor. Air sprayed from the air supply device 21 passes through the air introduction passage 21a and is introduced into the air distribution section 23 of the piping device 22.

The piping device 22 has an upper piping 24 through which air flows to form a first air curtain A1 that flows from the top to the bottom, a side piping 25 for forming a second air curtain A2 that flows toward the forging press 2, and an air distribution section 23 that distributes the air introduced from the air introduction passage 21a to the upper piping 24 and each side piping 25.

The air distribution unit 23 distributes the air introduced from the air introduction passage 21a to the upper pipe 24 and the side pipe 25 at a desired ratio. Although not shown, a valve for adjusting the flow rate of air supplied to the side pipe 25 is provided in the air distribution unit 23. By adjusting the opening of the valve, the flow rate of air supplied to the side pipe 25 is adjusted, and the flow rate of air supplied to the upper pipe 24 is also adjusted accordingly. For example, when the opening of the valve is reduced, the flow rate of air supplied to the side pipe 25 decreases, and the flow rate of air supplied to the upper pipe 24 increases accordingly. Note that the valve is not necessarily provided, and the flow rate of air between the upper pipe 24 and the side pipe 25 may be adjusted by making the pipes in the air distribution unit 23 different in thickness. Also, air may be made to flow evenly into the upper pipe 24 and the side pipe 25.

2 and 3, the upper piping 24 has a pair of upper vertical extensions 24a extending upward from the left and right side walls of the air distribution section 23, an upper connecting section 24b connected to the upper ends of the pair of upper vertical extensions 24a, and a pair of upper horizontal extensions 24c extending forward from the left and right ends of the upper connecting section 24b. The pair of upper vertical extensions 24a are each attached and supported by a bracket 62 on the frame 60. The front ends of the pair of upper horizontal extensions 24c are closed. The upper connecting section 24b and each upper horizontal extension 24c have a plurality of air outlets 24d for blowing air to form the first air curtain A1. Each air outlet 24d is formed in the lower part of the upper connecting section 24b and each upper horizontal extension 24c. The upper connecting portion 24b and each upper horizontal extending portion 24c are arranged to form a U-shape that opens toward the forging press 2 when viewed from the top to bottom. This causes the area behind the forging press 2 to be surrounded by the first air curtain A1 that flows from the top to the bottom.

As shown in FIG. 3, the side piping 25 has a pair of side vertical extensions 25a extending in the vertical direction, and a side horizontal extension 25b connecting the lower end of the side vertical extension 25a to the air distribution section 23. Each side vertical extension 25a is attached to and supported by a bracket 62 on the frame 60. The upper end of each side vertical extension 25a is closed. Although not shown, an air outlet is provided in the front portion of the side vertical extension 25a to form a second air curtain A2 that flows from the rear to the front.

The suction device 26 has a negative pressure generator 26a. The negative pressure generator 26a is connected to an air collection section 26b provided below the air distribution section 23 via a suction path 26c. Although not shown, a filter is provided in the front part of the air collection section 26b to prevent scale from being sucked in. The negative pressure generator 26a is, for example, a cyclone-type negative pressure generator, and generates negative pressure for suction by discharging air from within the device.

As shown in Figs. 1 and 2, the air blower 30 is configured to blow air toward the forging press 2 from the opposite side of the worker H. The air blower 30 of this embodiment has the effect of moving scale generated by the forging process toward the air curtain device 20, while at the same time cooling the worker H. Note that the air blower 30 can be of various forms as long as it can move the scale toward the air curtain device 20, and may be, for example, an air blow gun operated by the worker H.

The collection container 40 is composed of a bucket with a U-shaped cross section. The collection container 40 is supported by the frame 60 below the air distribution section 23. The collection container 40 is removable from the frame 60, and when scale accumulates in the collection container 40, the worker can remove the collection container 40 from the frame 60 and discard the scale.

A guide member 41 is attached to the frame 60 to guide the scale toward the collection container 40. The guide member 41 has a slide member 42 that extends obliquely from near the upper surface of the lower mold 4 to a position above the collection container 40 and slides the scale to the collection container 40, and multiple (here, five) shield members 43 that are positioned above the slide member 42.

The front end of the slide member 42 is located at the same position as the forwardmost air outlet 24d among the air outlets 24d provided in the upper horizontal extension portion 24c or further forward than the air outlet 24d. This allows the scale dropped by the first air curtain A1 to be properly collected.

Each of the shield members 43 has an inclined portion 43a that extends obliquely upward and forward, and a vertical wall portion 43b that extends straight up and down. The front end of each inclined portion 43a is located rearward of the upper connecting portion 24b. In other words, each inclined portion 43a is located rearward of the first air curtain A1. When viewed from the front, each vertical wall portion 43b partially overlaps with the inclined portion 43a of the adjacent shield member 43 below. The lower end of each vertical wall portion 43b is not in contact with the adjacent shield member 43. This forms a gap between the adjacent shield members 43, allowing scale to fall through the gap. Each shield member 43 is able to rotate slightly in the front-rear direction.

By having multiple shield members 43, even if scale passes through the first air curtain A1, the shield members 43 guide the scale toward the collection container 40. This improves the efficiency of scale collection.

In this way, in this embodiment, the scale collection device 10 is provided outside the forging press 2, and includes an air curtain device 20 that shields a predetermined area near the forging press 2 with the first and second air curtains A1 and A2 to move the scale in the air flow direction of the air curtains, and a collection container 40 for collecting the scale moved by the air curtain device 20. As a result, the scale that scatters when the workpiece W is processed by the forging press 2 can be moved by the first and second air curtains A1 and A2 and collected in the collection container 40. With the first and second air curtains A1 and A2, it is not necessary to cover the periphery of the forging press 2 as in the conventional method, so the worker H can actually confirm the moment of impact by the forging press 2. In forging work, the alignment of the workpiece W is important in improving the processing accuracy, and if the moment of impact can be confirmed, it is possible to improve the processing accuracy of the workpiece W. Therefore, the scale collection device 10 according to this embodiment can efficiently collect the scale while improving the processing accuracy of the workpiece W.

In addition, this embodiment is provided with an air blower 30 that moves the scale toward the first air curtain A1 formed by the air curtain device 20. This allows the scale to be moved toward the first air curtain A1, improving the efficiency of scale collection. It also prevents scale from accumulating on the forging press 2.

In this embodiment, the air curtain device 20 includes an air supply device 21, a piping device 22 that circulates the air discharged by the air supply device 21 above the workpiece processing section 4a in the forging press 2 and then blows it downward to form the first air curtain A1, and a suction device 26 that sucks in the air that has been discharged from the piping device 22 and formed the first air curtain A1. A part of the piping device (particularly the upper piping 24) is U-shaped and opens toward the forging press 2 when viewed from the top and bottom. This allows the area near the forging press 2 to be surrounded by the first air curtain A1. This further improves the efficiency of scale recovery.

The technology disclosed herein is not limited to the above-described embodiments, and may be substituted without departing from the spirit of the claims.

For example, in the above embodiment, the second air curtain A2 is formed by the air current flowing toward the forging press 2 side through the side pipes 25, but if the first air curtain A1 can be formed, the second air curtain A2 does not necessarily have to be formed. In this case, the pair of side pipes 25 can be omitted.

The above-described embodiments are merely examples and should not be interpreted as limiting the scope of the present disclosure. The scope of the present disclosure is defined by the claims, and all modifications and variations that fall within the scope of equivalence of the claims are within the technical scope of the present disclosure.

The technology disclosed here is useful as a scale recovery device that recovers scale generated when a workpiece is forged using a forging press.

2. Forging press
10 Scale recovery device
20 Air curtain device
21 Air supply device
22 Piping equipment
24 Upper piping (part of the piping system)
26 Suction device
30 Blower
40 Collection container
41 Guide member
A1 First air curtain A2 Second air curtain

Claims (4)

A scale recovery device that recovers scale generated when a workpiece is hot forged by a forging press,
an air curtain device that is provided separately from the forging press machine and outside the forging press machine, and that shields a predetermined area near the forging press machine with an air curtain to move the scale in the air flow direction of the air curtain;
a collection container for collecting the scale moved by the air curtain device ,
The air curtain device is a scale recovery device characterized in that it has a suction device that sucks in the air that forms the air curtain downstream in the airflow direction of the air curtain, and generates an airflow from above to below . The scale recovery device according to claim 1,
A scale collection device further comprising an air blower for moving the scale toward the air curtain formed by the air curtain device. The scale recovery device according to claim 1 or 2,
The air curtain device is
An air supply device;
A piping device that circulates the air discharged by the air supply device toward an upper side of the workpiece processing portion of the forging press and then blows the air toward a lower side so as to form an air curtain ;
having
A scale recovery device, characterized in that a portion of the piping device has a U-shape opening toward the forging press machine when viewed from above and below. In the scale recovery device according to any one of claims 1 to 3,
A scale collection device comprising a guide member for guiding the scale toward the collection container.

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