JP2007319884A - Method and apparatus for recovering oxide scale - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To recover oxide scale stuck to a die at hot-forging time in a low cost and without giving the load on the circumference. <P>SOLUTION: After opening the die, the oxide scale S stuck to the die is separated by applying a release agent L on the die in a hot-forging operating apparatus 12. The separated oxide scale S is introduced into a storing vessel 18 from a guide-trough 16 accompanied with the release agent L. The deposition of the oxide scales S is promoted under action of a magnet 30 in the storing vessel 18 and the top clear liquid (release agent L) is collected in a collecting vessel 24 by over-flowing and on the other hand, the deposited oxide scale S is scraped out with a scraper 44 in a conveyor 20 with the scraper and discharged from the storing vessel 18 and further, carried to a recovery transporter 64 by shifting to a V-shaped conveyor 22. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an oxide scale recovery method and apparatus for recovering oxide scale attached to a mold by separating it from the mold when hot forging is performed.

  In the hot forging process, the workpiece is introduced into the mold cavity in a state of being heated to a high temperature, and then a so-called mold closing is performed to apply a predetermined molding pressure to the workpiece. As a result, the workpiece is plastically deformed.

  Thus, oxidation occurs when the mold with which a high-temperature workpiece abuts comes into contact with the atmosphere when the mold is opened. For this reason, a metal mold | die will be in the state which the oxide scale adhered to the surface.

  When hot forging is performed on the next workpiece with the oxide scale remaining, the workpiece is pressed by the oxide scale, so that the corresponding portion is depressed and a product having a predetermined dimensional accuracy cannot be obtained. There is. In addition, there is a concern that the oxide scale bites between the mold and the workpiece to wear the mold, and as a result, the life of the mold is shortened.

  In addition, there is a concern that the oxide scale may fall off and enter the die drive unit of the forging apparatus, and bite into the die drive unit to wear the part.

  In order to avoid such a situation, by sending compressed air to the mold that has finished the predetermined number of hot forging processes, in other words, by periodically cleaning the mold The oxide scale is detached from the mold. However, when performing such an operation, the hot forging process must be interrupted, which disadvantageously reduces the production efficiency.

  Moreover, it is not easy to remove the dried oxide scale from the mold, and there is also a disadvantage that the operation itself is complicated.

  It is recalled that the oxide scale is automatically removed from the mold and collected in order to eliminate the above concerns and eliminate the need for complicated work.

  As scale recovery methods, techniques proposed in Patent Documents 1 and 2 are known. However, these are technologies for recovering scales that fall naturally after being generated in a workpiece or a heating furnace. Proposals for technologies for separating and recovering oxide scales attached to a die for hot forging. Has not been made.

JP 54-147111 A JP 54-131515 A

  As can be understood from the above, a technique for separating and recovering the oxide scale from the hot forging die has not yet been established.

  The present invention has been made to solve the above-mentioned problems, and it is possible to easily and easily remove the oxide scale from the mold and collect it, without reducing the production efficiency of the product, Furthermore, it aims at providing the oxide scale collection | recovery method and its apparatus which can also carry out the cyclic | annular reuse of the mold release agent used when releasing oxide scale.

In order to achieve the above object, the present invention is an oxide scale recovery method for recovering an oxide scale attached to a mold by separating it from the mold when performing hot forging,
Rinsing the mold to which the oxide scale is adhered with a release agent to detach the oxide scale from the mold;
Introducing the release agent containing the oxide scale from a flow path into a storage tank, and precipitating the oxide scale in the storage tank;
Raising the oxide scale from the bottom of the storage tank to the outlet of the storage tank by scraping the precipitated oxide scale with a scraper of a transporter with a scraper provided in the storage tank;
A step of transporting the oxide scale discharged from the discharge port of the storage tank to a recovery unit by a transport unit;
It is characterized by having.

  That is, in the present invention, the oxide scale is detached from the mold by the release agent applied at the time of mold opening. Since the opening of the mold and the application of the release agent are processes originally included in the hot forging process, in the present invention, the oxide scale can be released from the mold within the process. Therefore, it is not necessary to interrupt the hot forging work to desorb the oxide scale. Eventually, a decrease in product production efficiency is avoided.

  Moreover, according to the present invention, the oxide scale released from the mold is automatically conveyed by the scraper and finally recovered. That is, since the oxide scale is automatically detached and collected, no complicated work is required.

  In this case, it is preferable that the release agent separated from the oxide scale by overflowing the oxide scale is overflowed from the storage tank and collected in the collection tank. Since the collected release agent is clean, it can be reused as the release agent when the next mold opening is performed. That is, since the release agent can be circulated and reused, it is not necessary to perform chemical treatment on the release agent. This is advantageous in terms of cost and does not give a load to the environment.

  Here, it is preferable that the recovery means is disposed above the storage tank and the transfer means is provided to be inclined, and the oxide scale is raised to the recovery means by the inclined transfer means. In this case, the release agent accompanied by the oxide scale is caused to flow downward while being guided by the inclined conveying means. Thereby, a mold release agent can be isolate | separated from an oxide scale. If the separated release agent is collected in the collection tank, the recovery efficiency of the release agent is improved.

  As the conveying means for conveying the oxide scale to the collecting means, it is preferable to use a conveyor having a belt having a substantially V-shaped cross section in the width direction. In this case, the oxide scale is less likely to diffuse than when the oxide scale is lowered on a smooth belt. Therefore, it is possible to avoid the oxide scale from falling off the belt. It is also easy to collect the release agent separated from the oxide scale, and to collect it.

  Furthermore, it is preferable to provide a magnetic field generating means outside the bottom of the storage tank. Oxide scales are generally ferromagnetic and thus promote precipitation in the presence of magnetic field generating means. Therefore, it is possible to efficiently separate the release agent and the oxide scale.

Further, the present invention is an oxide scale recovery device for recovering by separating the oxide scale attached to the mold when performing the hot forging process from the mold,
A flow path for guiding the release agent containing the oxide scale by cleaning the mold to which the oxide scale is attached;
A reservoir for introducing the mold release agent containing the oxide scale to precipitate the oxide scale at the bottom;
A transporter with a scraper provided in the storage tank and having a scraper for raising the precipitated oxide scale from the bottom of the storage tank to the discharge port of the storage tank;
Transport means for transporting the oxide scale discharged from the discharge port of the storage tank to a recovery means;
It is characterized by having.

  With such a configuration, as described above, it is possible to automatically perform the process until the oxide scale is separated from the mold and recovered. In addition, it is possible to avoid a reduction in product production efficiency.

  Then, if a collection tank is installed to collect the release agent that has separated from the oxide scale by precipitation of the oxide scale in the storage tank and overflowed from the storage tank, the release agent is circulated and recirculated. Not only is it easy to use, but it is also possible to avoid burdening the environment.

  Furthermore, the recovery means is disposed above the storage tank, and the transport means is provided at an inclination. The inclined transport means raises the oxide scale to the recovery means, and is accompanied by the oxide scale. The release agent recovery efficiency can be improved by guiding the release agent to the collection tank by the conveying means.

  In any case, it is preferable that the conveying means is constituted by a conveyor having a belt having a substantially V-shaped cross section in the width direction. As a result, the oxide scale can be prevented from falling off from the belt as described above, and the release agent separated from the oxide scale can be easily collected and recovered.

  In addition, it is preferable to provide the magnetic field generating means outside the bottom of the storage tank, since the precipitation of oxide scale can be promoted.

  In this case, in the bottom of the storage tank, it is preferable that the portion where the magnetic field generating means is provided outward is made of stainless steel to which a magnet can adhere via magnetic force. Thereby, it is avoided that magnetic force is interrupted and oxide scale precipitation is suppressed. In addition, since stainless steel is excellent in wear resistance, wear when the oxide scale slides is suppressed as the oxide scale is scraped out by the conveying means with a scraper.

  According to the present invention, the oxide scale is detached from the mold by the release agent applied at the time of mold opening. That is, in the present invention, the oxide scale is separated from the mold in the process performed during the hot forging process, so that it is not necessary to interrupt the hot forging process operation to desorb the oxide scale. Therefore, it is avoided that the production efficiency of a product falls.

  The desorbed oxide scale is automatically recovered by the recovery means via the transport means with scraper and the transport means. That is, in the present invention, since the oxide scale is detached and collected automatically, a complicated operation is not required.

  Furthermore, if the release agent separated from the oxide scale is collected, it can be reused as the release agent applied to the mold at the next mold opening, which is advantageous in terms of cost and impacts on the environment. I don't give it.

  Hereinafter, preferred embodiments of the oxide scale recovery method according to the present invention will be described in detail with reference to the attached drawings in connection with an apparatus for carrying out the method.

  FIG. 1 is a schematic overall configuration diagram of an oxide scale recovery device (hereinafter also simply referred to as a recovery device) 10 according to the present embodiment. The recovery device 10 is attached to a hot forging device 12. Note that reference numeral 14 in FIG. 1 indicates a floor on which an operator who performs hot forging work walks. That is, the recovery device 10 is provided in an underground portion of the floor 14 where the hot forging device 12 is installed.

  In this case, the recovery device 10 receives a guide rod 16 as a flow passage communicating with a recovery groove (not shown) provided in the vicinity of the hot forging device 12 and the fluid guided by the guide rod 16. From a storage tank 18 for storing, a conveyor with scraper (conveying means with scraper) 20, most of which is provided inside the storage tank 18 and whose one end protrudes from the storage tank 18, and from the conveyor 20 with scraper A V-shaped conveyor (conveying means) 22 for conveying the discharged oxide scale S is provided, and a collection tank 24 is provided below the storage tank 18.

  The collection tank 24 is provided by sinking a part of the underground floor 26. The release agent L is collected in the collection tank 24 as described later. Note that a metal mesh 28 is placed over the opening of the collection tank 24.

  The storage tank 18 is disposed above the collection tank 24 in a state spaced apart from the collection tank 24 by a post (not shown). And the magnet 30 as a magnetic field generation means is arrange | positioned outside the bottom part of the storage tank 18. As shown in FIG. A plate 32 made of stainless steel to which the magnet 30 can be attached via a magnetic force is connected to a portion facing the magnet 30 in the bottom of the storage tank 18. Examples of this type of stainless steel include so-called 400 series stainless steels such as SUS410 and SUS430.

  The parts other than the plate 32 at the bottom are made of a material excellent in wear resistance, preferably SUS304 or the like. Of course, parts other than the plate material 32 may be provided by SUS410, SUS430, or the like in the same manner as the plate material 32.

  As shown in FIG. 2, the storage tank 18 has one end portion inclined toward the floor 14 (upward), and the end of the one end portion is provided at a higher position than the other end portion. . The end of the one end is open, and the opening functions as a discharge port 34 for discharging the oxide scale S. Moreover, as shown in FIG. 3, the window part 36 is penetrated and formed in the both sides | surfaces of the storage tank 18, and it isolate | separates from the supernatant liquid obtained by precipitation of the oxide scale S, ie, the oxide scale S. The release agent L overflows from each window 36 and is collected in the collection tank 24.

  On the other hand, a net 37 is put on the end of the storage tank 18 on the side facing the guide rod 16 at the open top.

  The scraper-equipped conveyor 20 includes a horizontal portion 38 that extends in the horizontal direction and an inclined portion 40 that is inclined at an angle substantially matching the inclined one end portion of the storage tank 18 (see FIG. 2). The horizontal portion 38 is immersed in the release agent L in the storage tank 18. One inclined portion 40 is partially immersed in the release agent L, but the upper end portion protrudes from the release agent L.

  A plurality of scrapers 44 are provided at predetermined intervals on the belt 42 constituting the scraper-equipped conveyor 20. That is, the scraper 44 has a substantially flat plate shape, and extends in a direction substantially orthogonal to the longitudinal direction of the belt 42, in other words, extends in the width direction (see FIG. 3). The scraper 44 plays a role of scraping the oxide scale S precipitated at the bottom of the storage tank 18 in the direction of the arrow A as the belt 42 rotates along the direction of the arrow A in FIG.

  Note that the length of the scraper 44 in the vertical direction is set so that the front end surface thereof is slightly separated from the bottom of the storage tank 18.

  As shown in FIG. 1, the V-shaped conveyor 22 is installed inclined at an angle that is substantially parallel to the inclined portion 40 of the scraper-equipped conveyor 20.

  Here, the relationship between the inclination angle of the V-shaped conveyor 22, the ease of transporting the oxide scale S, and the ease of separation (liquid breakage) of the release agent L from the oxide scale S is shown in FIG. 4. . In FIG. 4, “著 し く” indicates that it is extremely easy, “◯” indicates that it is easy, and “Δ” indicates that the transport amount and the amount of liquid leakage are slightly reduced.

  As shown in FIG. 4, as the inclination angle of the V-shaped conveyor 22 becomes gentler, the transport of the oxide scale S becomes easier, but the amount of liquid leakage tends to decrease. The recovery amount of the release agent L is reduced. On the other hand, as the inclination angle of the V-shaped conveyor 22 becomes steeper, the amount of liquid drain increases, but it becomes difficult to transport the oxide scale S.

  Therefore, the inclination angle of the V-shaped conveyor 22 is preferably set to 15 ° to 25 °, which allows easy transport of the oxide scale S and can be balanced with running out of liquid, and more preferably 20 °. preferable.

  As shown in FIG. 5, the V-shaped conveyor 22 is a so-called two-point carrier roller type. That is, the V-shaped conveyor 22 has a pair of frame stands 48a and 48b erected on both ends in the width direction of the bracket 46, and the pair of frame stands 48a and 48b are connected with a swing joint 50a and a ring. Two rollers 54a and 54b are bridged via a joint 52 and a swing joint 50b. Further, a V-belt 56 is suspended on these rollers 54a and 54b.

  The V-belt 56 has a substantially V-shaped cross section in the width direction. That is, the V-belt 56 has a shape in which a substantially central portion in the width direction is depressed most.

  A recovery tank 58 is installed below one end of the V-shaped conveyor 22 facing the collection tank 24. A drain port 60 is provided at the bottom of the recovery tank 58, and a filter 62 is exchangeably fitted to the drain port 60. Further, the drain port 60 is opened above the wire mesh 28 placed on the upper part of the collection tank 24.

  The other end of the V-shaped conveyor 22 extends to a position higher than the floor 14. A recovery vehicle 64 as a recovery means is disposed below the other end.

  The recovery apparatus 10 according to the present embodiment is basically configured as described above. Next, the operation and effect will be described in relation to the oxide scale recovery method.

  Prior to the hot forging process, the scraper-equipped conveyor 20 is energized. That is, the belt 42 starts rotating in the arrow A direction. Here, since the tip end surface of the scraper 44 is slightly separated from the bottom of the storage tank 18 as described above, the bottom is not worn by the scraper 44.

  When the hot forging process is completed once and the mold opening is performed, the oxide scale S is attached to the mold of the hot forging apparatus 12. After the opening of the mold, the mold release agent L is applied to the mold before the next hot forging process. In this embodiment, the oxide scale S is released by the mold release agent L. Release from mold L.

  That is, in this case, the mold is washed with the release agent L, and as a result, the oxide scale S attached to the mold is peeled off. The peeled oxide scale S flows together with the mold release agent L, drops or flows down below the hot forging device 12, and is collected in the recovery groove (not shown).

  The release agent L containing the oxide scale S is introduced into the storage tank 18 from the recovery groove via the guide rod 16. Here, the oxide scale S is formed by oxidizing the surface of a mold (steel material) and is generally a ferromagnetic material. Therefore, the oxide scale S is attracted to the magnet 30 provided at the bottom of the storage tank 18. That is, precipitation of the oxide scale S is promoted by the magnet 30.

  Here, in the bottom part of the storage tank 18, the board | plate material 32 which is a site | part by which the magnet 30 was provided in the outward consists of stainless steel which adheres to the magnet 30 via magnetic force. For this reason, the magnetic force of the magnet 30 is not interrupted by the plate material 32.

  The precipitated oxide scale S is conveyed by being scraped by the scraper 44. At this time, the oxide scale S is in sliding contact with the bottom of the storage tank 18, but the bottom is made of a material having excellent wear resistance such as SUS410 and SUS304, so that the bottom is prevented from being worn by the sliding contact. Is done.

  The oxide scale S transported along the bottom of the storage tank 18 is finally discharged from one open end surface (discharge port 34) of the storage tank 18, and onto the V belt 56 of the V-shaped conveyor 22. Descent towards. Since the oxide scale S at this time contains a little release agent L, the oxide scale S is substantially in the form of a slurry, and contacts the V-belt 56 in this state.

  As described above, the V belt 56 of the V-shaped conveyor 22 has a substantially V-shaped cross section (see FIG. 5). For this reason, it is possible to avoid the oxide scale S from diffusing as a result of coming into contact with the V-belt 56 and eventually leaking from the V-belt 56.

  Further, in the oxide scale S placed on the V-belt 56 having a substantially V-shaped cross section, the release agent L flows and gathers toward the most depressed central portion in the width direction of the V-belt 56. The assembled release agent L is inclined at an appropriate angle, preferably 15 ° to 25 °, so that the V-belt 56 is inclined while being guided by the depressed bottom of the V-belt 56. The liquid flows along the flow and is collected in the collection tank 58, and drops or flows down from the drain port 60 to the collection tank 24.

  In this way, by using the V-shaped conveyor 22 and appropriately setting the inclination angle, the release agent L discharged along with the oxide scale S is leaked from the width direction of the V-belt 56. And efficient recovery.

  When the oxide scale S is contained in the release agent L guided by the V-belt 56 and collected in the collection tank 58, the oxide scale S is applied to the filter 62 fitted in the drain port 60. It is collected. This collection prevents the oxide scale S from being mixed into the release agent L in the collection tank 24. When the filter 62 is clogged with the oxide scale S, the filter 62 may be replaced with a new one.

  The oxide scale S transported by the V-shaped conveyor 22 is discharged from the V-shaped conveyor 22 and collected by the collection vehicle 64. When the oxide scale S reaches a predetermined amount or more, the collection vehicle 64 moves to a processing station (not shown) for processing the oxide scale S.

  As described above, in the present embodiment, the oxide scale S is easily and easily detached from the mold and collected by the usual operation of applying the release agent L to the mold. be able to.

  Moreover, this detachment operation is performed from the mold opening to the mold closing during the hot forging process. Moreover, the collection | recovery operation | work of the oxide scale S advances in parallel with a hot forging process operation. That is, the hot forging work is not stopped for the separation work or the collection work. For this reason, it can avoid that the production efficiency of a product falls.

  In addition, even if the oxide scale S enters below the V belt 56, the V-shaped conveyor 22 rotates the V belt 56 by the rotation of the rollers 54a and 54b. Thus, the occurrence of biting of the oxide scale S is avoided. Therefore, the concern that the rollers 54a and 54b are worn away is eliminated.

  On the other hand, in the storage tank 18, as the oxide scale S precipitates, the release agent L starts to be stored as a supernatant. When this supernatant liquid exceeds a predetermined amount, overflow occurs from the window portions 36 provided on both side surfaces of the storage tank 18.

  The overflowing supernatant, in other words, the release agent L separated from the oxide scale S is collected in the collection tank 24. Since the mold release agent L does not contain the oxide scale S, it can be reused as the mold release agent L applied to the mold when the next hot forging process is completed. At this time, pumping may be performed using a pump or the like (not shown).

  That is, according to the present embodiment, it is possible to circulate and reuse the release agent L from which the oxide scale S has been removed from the mold. For this reason, since it is not necessary to perform chemical treatment on the release agent L, not only is it advantageous in terms of cost, but also the burden on the environment can be significantly reduced.

  In the above-described embodiment, only one magnet 30 is installed. Needless to say, a plurality of magnets 30 may be installed.

  Further, although the collection vehicle 64 is adopted as the collection means, it may be a conveyance means for conveying the oxide scale S to the processing station.

It is a schematic whole block diagram of the oxide scale collection | recovery apparatus which concerns on this Embodiment. It is a principal part enlarged explanatory view of the oxide scale collection | recovery apparatus of FIG. It is a schematic longitudinal cross-sectional front view of the storage tank which comprises the oxide scale collection | recovery apparatus of FIG. It is a graph which shows the relationship between the inclination-angle of a V-shaped conveyor, the ease of conveyance of an oxide scale, and the isolation | separation (liquid running out) of a mold release agent from this oxide scale. It is a schematic longitudinal cross-sectional front view of the V-shaped conveyor which comprises the oxide scale collection | recovery apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Oxide scale collection device 12 ... Hot forging processing device 16 ... Guide rod 18 ... Storage tank 20 ... Scraper-equipped conveyor 22 ... V-shaped conveyor 24 ... Collection tank 30 ... Magnet 32 ... Plate material 34 ... Discharge port 36 ... Window Part 38: Horizontal part 40 ... Inclined part 42 ... Belt 44 ... Scraper 54a, 54b ... Roller 56 ... V belt 58 ... Collection tank 64 ... Collection vehicle L ... Release agent S ... Oxide scale

Claims (11)

An oxide scale recovery method for recovering the oxide scale attached to the mold by separating from the mold when performing hot forging,
Rinsing the mold to which the oxide scale is adhered with a release agent to detach the oxide scale from the mold;
Introducing the release agent containing the oxide scale from a flow path into a storage tank, and precipitating the oxide scale in the storage tank;
Raising the oxide scale from the bottom of the storage tank to the outlet of the storage tank by scraping the precipitated oxide scale with a scraper of a transporter with a scraper provided in the storage tank;
A step of transporting the oxide scale discharged from the discharge port of the storage tank to a recovery unit by a transport unit;
An oxide scale recovery method characterized by comprising:   The recovery method according to claim 1, wherein the release agent separated from the oxide scale by overflowing the oxide scale is overflowed from the storage tank and collected in a collection tank. Collection method.   3. The recovery method according to claim 2, wherein the recovery means is disposed above the storage tank and the transfer means is provided to be inclined, and the oxide scale is raised to the recovery means by the inclined transfer means. The oxide scale recovery method, wherein the release agent accompanied by the oxide scale is guided to the collection tank by the transport means.   The recovery method according to any one of claims 1 to 3, wherein a conveyor having a belt having a substantially V-shaped cross section in the width direction is used as the transport unit that transports the oxide scale to the recovery unit. An oxide scale recovery method characterized by the above.   The recovery method according to any one of claims 1 to 4, wherein a magnetic field generating means is provided outside the bottom of the storage tank to promote precipitation of the oxide scale. . An oxide scale recovery device that recovers the oxide scale attached to the mold by separating from the mold when performing hot forging,
A flow path for guiding the release agent containing the oxide scale by cleaning the mold to which the oxide scale is attached;
A reservoir for introducing the mold release agent containing the oxide scale to precipitate the oxide scale at the bottom;
A transporter with a scraper provided in the storage tank and having a scraper for raising the precipitated oxide scale from the bottom of the storage tank to the discharge port of the storage tank;
Transport means for transporting the oxide scale discharged from the discharge port of the storage tank to a recovery means;
An oxide scale recovery device comprising:   The collection device according to claim 6, further comprising: a collection tank for collecting the release agent that has separated from the oxide scale by the precipitation of the oxide scale in the storage tank and overflowed from the storage tank. Furthermore, the oxide scale collection | recovery apparatus characterized by having.   8. The recovery apparatus according to claim 7, wherein the recovery means is disposed above the storage tank and the transfer means is inclined, and the oxide scale is raised to the recovery means by the inclined transfer means. On the other hand, the oxide scale recovery apparatus is characterized in that the release agent accompanied by the oxide scale is guided to the collection tank by the conveying means.   9. The oxide scale recovery apparatus according to claim 6, wherein the transport unit is a conveyor having a belt having a substantially V-shaped cross section in the width direction.   The recovery apparatus according to any one of claims 6 to 9, wherein magnetic field generating means for promoting precipitation of the oxide scale is provided outside the bottom of the storage tank. apparatus.   11. The recovery apparatus according to claim 10, wherein a portion of the bottom portion of the storage tank where the magnetic field generating means is provided outward is made of stainless steel to which a magnet can be attached via magnetic force. Scale collection device.

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