JP6716509B2 - Salt bath austemper quenching furnace - Google Patents

Description

The present invention relates to an austemper quenching furnace using a salt bath (molten salt bath) (hereinafter referred to as a salt bath austemper quenching furnace). More specifically, according to the present invention, a residual product is collected without returning a heat-treated product that is attached to a conveyor that conveys a heat-treated product (also called a work) in a salt bath and tries to return to the salt bath without returning it to the salt bath. The present invention relates to a salt bath austemper quenching furnace equipped with a mechanism.

As shown in FIG. 1, an austemper heat treatment system using a salt bath is composed of a heating furnace 1, a salt bath austemper quenching furnace 2, a water washing tank 3, and a drying device 4, and each component The workpiece is heated to an austenite region while being conveyed at a constant speed by a mesh conveyor incorporated in the apparatus, and then subjected to a constant temperature transformation treatment (austempering treatment). Here, since the salt has adhered to the work that has passed through the salt bath austemper quenching furnace 2, the water is removed in a drying furnace after cleaning in a water washing tank.

The work subjected to austempering is transferred to the upper part of the washing tank by the mesh conveyor and dropped into the washing tank at the discharge port (dropping port). However, the salt attached to the mesh conveyor and the work is solidified at the outlet of the austempering quenching furnace, and in the case of a work of several grams or less, it sticks to the mesh conveyor due to the solidified salt, and the end of the mesh conveyor is folded back. At that point, it returns to the salt bath of the austemper quenching furnace 2 without dropping into the washing bath, and the salt dissolves in the salt bath, causing it to drop into the salt bath and remain as a residual product. ..

As a result, a large amount of work accumulates on the bottom of the salt bath, which causes an obstacle in driving the mesh belt. Also, in the case of continuous multi-product processing, if a part of the work remains in the equipment and mixes as a different product when different works are being flown, a lot out will occur and quality problems as well as productivity will increase. Leading to a decrease in In addition, the remaining product causes a problem such as deterioration of the salt bath, which accelerates the replacement time of the salt bath agent. For this reason, it is unavoidable to frequently perform cleaning work for periodically taking out the residual products accumulated in the salt bath, which significantly hinders the productivity of heat treatment. For this reason, the recovery of residual products has become an important issue.

Therefore, in the conventional austempering quenching furnace, brushing, shaking, high-pressure air blow, etc. have been adopted as a method of removing the work stuck to the mesh conveyor. In the case of a work, there are problems such as insufficient removal even by brushing or shaking, and the work being blown off by high-pressure air blowing.

It has also been proposed to equip the discharge port side of the salt bath with an impacting means/hammer that impacts the mesh conveyor to attempt to drop the work (Patent Document 1). The striking means/hammer is provided on the exposed portion of the molten salt bath at the end of the mesh conveyor on the discharge side of the austempering quenching furnace, and between the forward (upper) side and the return (lower) side mesh belt. It is provided so as to intermittently give an impact to the lower mesh belt which is the return side at that position.

JP, 2010-1522, A

However, according to the austempering quenching furnace according to the invention described in Patent Document 1, since the mesh belt that conveys the work is intermittently hit with a hammer, the work caught on the mesh belt is dropped. , The mesh conveyor deteriorates and cannot be used for a long time. In particular, in the case of an austempering quenching furnace for small products, since the mesh belt has a small mesh and a small wire diameter, it is poor in strength, and therefore the mesh conveyor is severely deteriorated. On the other hand, if the striking force is suppressed, the striking effect is weak and the work may not be dropped.

Moreover, since the impact is applied to the lower mesh belt on the return side, the molten salt is cooled and solidified at the impact position, so that the peeling effect by vibration is halved. Therefore, unless a stronger impact is applied to the conveyor, the work cannot be dropped and the conveyor is further deteriorated.

Further, in the vibration/shock method, since the driving part is assembled inside the loop of the mesh conveyor, it is difficult to confirm the operating state of the striking means/hammer, and it is also difficult to adjust and maintain.

Further, in order to equip the mesh belt with a striking means and a hammer, there is a problem that the structure of the austemper quenching furnace itself needs to be largely changed, such as lengthening the frame of the conveyor at the salt bath exit. ..

The present invention, without adding excessive vibration or impact to the mesh conveyor, sticks to the mesh conveyor, does not fall into the washing tank at the outlet of the mesh conveyor as it is austemper quenching furnace (salt bath) It is an object of the present invention to provide an austempering quenching furnace that enables more reliable recovery of a work that is about to return to the above.

In order to achieve such an object, the invention according to claim 1 is such that a workpiece heated to an austenite region is dipped in a molten salt bath in a constant temperature state, and the time required for the austempering treatment is taken to mesh the salt bath. in conveying falling naturally is to salt bath austempering quenching furnace to the discharge port from the mesh conveyor for turning outside the molten salt bath in the conveyor, disposed opposite to the belt surface of the back side of the mesh conveyor to the discharge port of the salt bath It is equipped with a magnetic separator that magnetically absorbs and collects the residual work that is trying to return to the molten salt bath while being stuck to the mesh conveyor without being naturally dropped from the mesh conveyor, and the magnetic separator is A residual work magnetic attraction member made of a non- magnetic material, and a magnet that gives a magnetic attraction force to the surface of the residual work magnetic attraction member, and the magnetic attraction force reaches within a certain area of the residual work magnetic attraction member. The magnetic attraction force does not reach outside of that range, and the magnetic attraction force formed on the surface of the remnant work magnetic attraction member moves due to the magnetic attraction force and is stripped from the mesh conveyor and collected. The remaining work pieces are transported to the outside of the magnetic attraction range and then dropped.

Here, the magnet separator has a remnant work magnetic attraction member composed of a non-magnetic rotating drum, and a magnet fixedly supported at a fixed position inside the rotating drum to give a magnetic attraction force. It is preferable that the magnetic attraction force is exhibited within a certain region within the range, and the magnetic attraction force is not exhibited outside the range.

Further, fixed on the surface of Zanpin work magnetic attraction member moves with Zanpin work magnetic attraction member, or provided with a scraper circulating movement along the surface of the Zanpin work magnetic attraction member, the residual by magnetic attraction force It is preferable that the remaining work pieces staying on the magnetic work magnetic attraction member are forcibly scraped off.

Further, the salt bath austempering quenching furnace according to the present invention is provided with a residual product recovery tray for accommodating the residual product workpieces falling from the residual product magnetic adsorption member and extracting the recovered residual product workpieces from a route different from the discharge port. It is preferable to provide.

Further, the salt bath austemper quenching furnace according to the present invention is a residual product work that remains or adheres to the surface of the residual product magnetic attraction member by spraying a water flow on the position where the magnetic effect of the residual work magnetic attraction member is not exerted. It is preferable to provide a running water chute for dropping.

According to the salt bath austempering quenching furnace of claim 1, at the outlet of the austempering quenching furnace, the work spontaneously drops from the mesh belt of the belt conveyor that changes the direction outside the molten salt bath, while the mesh belt. Remaining work that was trying to return to the austempering quenching furnace while being stuck to was abraded to the magnet separator side as it was peeled off from the mesh belt by the suction force of the magnet of the magnet separator, and approached the area where no magnet existed. At this time, since it is arranged to be collected by dropping it, it is possible to collect the residual work that is going to return to the molten salt bath side without adversely affecting the mesh belt.

In addition, since a magnetic separator is simply placed below the outer end of the molten salt bath of the belt conveyor that changes direction at the outlet of the salt bath austempering quenching furnace, a major structural change of the austempering quenching furnace itself is required. Not accompanied. Moreover, since the magnet separator can be confirmed from the outlet inspection door of the salt bath austempering quenching furnace, maintenance is easy.

1 is a principle view showing an example of an austempering treatment system including a salt bath austempering quenching furnace of the present invention. It is a longitudinal cross-sectional view showing the structure near the outlet of the salt bath austemper quenching furnace according to the present invention. It is a cross-sectional view showing the structure near the outlet of the salt bath austempering quenching furnace. It is a schematic principle figure which shows one Embodiment of the drum separator concerning this invention, (A) is shown cross-sectionally, (B) is shown longitudinally, respectively. 1 is a schematic principle view showing an embodiment of a salt bath austemper quenching furnace of the present invention, schematically showing a relationship between a mesh belt, a drum separator and a residual product recovery tray. It is a schematic diagram showing other embodiments of a drum separator.

Hereinafter, the configuration of the present invention will be described in detail based on the embodiments shown in the drawings.

FIG. 1 shows an embodiment of an austempering processing system including a salt bath austempering quenching furnace of the present invention. The austemper heat treatment system using this salt bath is composed of a heating furnace 1, a salt bath austemper quenching furnace 2, a washing tank 3 and a drying furnace 4, and a mesh conveyor incorporated in each constituent device. A molten salt bath in which a heat-treated product (hereinafter, referred to as a work) is conveyed at a constant speed by 5, 9, 15, and 16 and is heated to an austenite region, for example, 800° C. to 900° C. and then temperature controlled to about 400° C. A constant temperature transformation process (austempering process) is performed in the (salt bath) 8. Then, after the salt (molten salt) adhering to the austempered work is washed in the water washing tank 3, the moisture is removed in the drying furnace 4.

In this austempering treatment system, the salt bath austempering quenching furnace 2 performs the austempering treatment while immersing the workpiece heated to the austenite region in the heating furnace 1 in the molten salt bath 8 in a constant temperature state of about 400°C. It takes a necessary time to convey the salt in the bath tub 7 by the belt conveyor 9, and when the mesh belt 13 is turned 180° to the return side outside the molten salt bath 8, the mesh belt 13 is naturally dropped to the washing tank 3 from the discharge port 10. It is provided to move. A hopper 30 is provided at the discharge port 10 so that the austemper heat-treated work discharged from the salt bath austemper quenching furnace 2 is collected so as not to be scattered and dropped onto the conveyor 15 of the washing tank 3. It is provided.

The salt bath austemper quenching furnace 2 of the present embodiment circulates, for example, as shown in FIG. 1, from under the dropping port 6 of the heating furnace 1 to above the work discharge port 10 connected to the inlet of the washing tank. A molten salt bath 8 is formed by storing salt in a molten state in a salt bath 7 equipped with a belt conveyor 9 and holding the salt in a constant temperature state. A constant temperature transformation process is performed while the mesh belt 13 of the belt conveyor 9 immersed in 8 is received and conveyed, and after the austempering process is completed, it reaches the end of the mesh belt 13 and enters the washing tank 3. It is configured to be dropped. The belt conveyor 9 includes, for example, a first sprocket 11 immersed in the molten salt bath 8 and a second sprocket 12 existing above the discharge port 10 outside the molten salt bath 8. A mesh belt 13 is stretched along a belt guide (not shown), and is rotationally driven by a drive source (not shown) outside the salt bath 7.

As shown in FIGS. 2 and 3, the salt bath austemper quenching furnace 2 has a molten salt bath 8 attached to the mesh belt 13 without being naturally dropped from the mesh belt 13 of the belt conveyor 9 as shown in FIGS. There is provided a magnetic separator 20 that magnetically attracts a work (hereinafter, referred to as a residual work W) that is going to return to the inside, and strips and collects the work from the mesh belt 13. The magnet separator 20 includes a residual work magnetic attraction member 21 made of a non-magnetic material, which faces the mesh belt surface on the return side of the belt conveyor 9, and a magnet 22 which applies a magnetic attraction force to the surface of the residual work magnetic attraction member 21. Within a certain area of the relative movement range of the residual work magnetic attraction member 21 (generally, a range in which magnets are arranged, hereinafter referred to as magnetic attraction range θ), the magnetic attraction force is outside the range. Then, the magnet 22 is arranged so that the magnetic attraction force does not reach, and the residual work W collected by being attracted by the magnetic attraction force and peeled off from the belt conveyor 9 is conveyed to the outside of the magnetic attraction range θ. It is designed to be dropped first. That is, since the residual work W is attracted to the surface of the magnetic attraction member 21 by the attraction force of the magnet 22, when the magnetic attraction member 21 rotates, it moves together due to friction with the magnetic attraction member 21. When the remaining work W moves, it slides on the magnetic attraction member 21.

In the case of the present embodiment, the magnet separator 20 includes, for example, a residual work magnetic attraction member including a non-magnetic rotary drum 21 and a magnet 22 that is fixedly supported at a fixed position inside the rotary drum 21 to apply a magnetic attraction force. And a magnetic attraction force is shown within a certain region within the rotation range of the rotary drum 21, and a magnetic attraction force is not exhibited outside the range. In this case, since the space occupied by the magnet separator 20 can be accommodated within the size of the rotary drum 21, it can be made compact and space-saving, and a large structural change of the austemper quenching furnace 2 itself, for example, Unlike the invention described in Patent Document 1, since the mesh belt 13 is provided with a hitting means and a hammer for impacting, it is not necessary to make a large change such as lengthening the frame of the conveyor at the salt bath outlet.

As shown in FIG. 4, for example, the magnet separator 20 includes a non-magnetic rotating drum 21 and a magnetic drum 23 that is arranged inward of the non-magnetic rotating drum 21 and includes a magnet 22 that applies a magnetic attraction force. The rotary drum 21 is rotatably supported by a bearing 26. The rotary drum 21 has a rotary shaft 24 at one end rotatably supported by a bearing member 28, and a sprocket 18 mounted on the rotary shaft 24 and a drive motor 17 installed in the quenching furnace 2 in a drive chain 19. Are connected and driven to rotate. On the other hand, the magnetic drum 23 is fixed by a fixed shaft portion 25 supported by a shaft fixing portion 29 outside the rotary drum 21, and a rotary shaft 24 on the rotary drum 21 side supported by a bearing 26. The rotary drum 21 is made of, for example, a non-magnetic material such as stainless steel or synthetic resin, and cannot itself attract the residual work W by magnetic force. In the case of this embodiment, the rotary drum 21 is made of stainless steel. Inside the rotating drum 21, a rare earth magnet such as a magnet 22 that does not demagnetize even at the ambient temperature of the austempering treatment, for example, a samarium cobalt magnet (a magnet of an intermetallic compound of samarium of rare earth metal and cobalt) is provided. In this embodiment, a permanent magnet is used as the magnet 22, but the present invention is not limited to this and an electromagnet may be used depending on the case.

The magnet separator 20 is arranged at a position slightly closer to the first sprocket 11 than the second sprocket 12 and is opposed to the belt surface on the return side of the belt conveyor 9. For example, the rotation center of the rotary drum 21 is arranged on the rear side (the furnace side from the folding position) of the line hanging from the rotation center of the second sprocket 12 of the belt conveyor 9, and the drum rotation center and the second sprocket 12 are arranged. The magnet 22 is installed so as to be located on the far side from the line connecting the center of rotation of. The rotary drum 21 is provided so as to rotate in the same direction as the traveling direction of the mesh belt 13 on the return side. As a result, the work 22 that naturally falls when the mesh belt 13 turns 180° is not attracted by the magnet 22 inside the rotary drum 21, and cannot be naturally dropped and is returned to the return side while being attached to the mesh belt 13. It functions to adsorb only the remaining work W and transfer it to the rotary drum 21 side.

Further, if the gap (distance) S between the rotating drum 21 of the magnet separator 20 and the mesh belt 13 on the return side is too close to each other, there is a risk of interference and deformation when the remaining work W overlaps. If it passes, the sufficient suction force does not reach the remaining work W and it becomes difficult to adsorb the remaining work W. From this, in the case of the present embodiment in which the samarium cobalt magnet 22 is used and the rotary drum 21 is used as the residual work magnetic attraction member, it is preferable that the length is, for example, about 60 mm, but the present invention is not limited to this. It is appropriately adjusted according to the strength of the magnet 22 and the thickness of the rotary drum 21. Further, the magnet 22 is sufficient if it is arranged in a region where the mesh belt 13 and the rotating drum 21 are closest to each other, but more preferably, the magnet 22 exerts an influence of the attraction force of the magnet 22 even before and after that. It is preferable to arrange up to a region extending before and after the position. For example, as shown in FIG. 2 and FIG. 4, the magnet 22 is at least forward from the center of rotation of the rotary drum 21 (on the side of the first sprocket) by 5 to 10° to the rear (on the side of the second sprocket). It is sufficient for the workpiece W to be adsorbed from the mesh belt 13 if it is arranged between the positions delayed by 5 to 10°, but preferably from the rotation center of the rotary drum 21 to the front side (first sprocket side). It is arranged between a position advanced by 10° and a position delayed by 90° rearward. That is, the magnet 22 is installed at an angle of at least 10° to 20°, preferably 100°. Therefore, in the case of the present embodiment, the arc-shaped magnet 22 having an angle of about 95° is fixed. In this case, the residual work W adsorbed from the mesh belt 13 is the trailing edge of the rotary drum 21 (the rear line of the line where the horizontal plane passing through the rotation center axis and the peripheral surface of the rotary drum 21 intersect). Alternatively, since it passes through the position and falls at a slightly forward fixed position, it is possible to prevent the residual work W from scattering in the residual collection tray 31.

Further, a scraper 27 is provided on the surface of the rotary drum 21 which is a residual work magnetic attraction member, and is provided so as to scrape off the residual work W slid and retained on the surface of the rotary drum 21 due to the magnetic attraction force. Has been. In the case of the present embodiment, the scraper 27 is, for example, a rectangular rod having a rectangular cross section, and is disposed on the outer peripheral surface of the rotating drum 21 in parallel with the center of rotation and fixed by welding. Of course, the scraper 27 does not necessarily have to be arranged parallel to the center of rotation, and may be formed in a spiral shape that is inclined with respect to the center of rotation in some cases. The height of the scraper 27 needs to be at least high enough to scrape off the residual work W remaining on the peripheral surface of the rotary drum 21, but it is preferable that the scraper 27 does not interfere with the mesh belt 13. ..

Further, a running water chute 35 for spraying a water flow is provided at a position where the magnetism of the rotating drum 21 does not affect, for example, at a position near the trailing edge of the rotating drum 21 or a position slightly passing the trailing edge. In the case of the present embodiment, the running water chute 35 is arranged above the remaining product collecting tray 31, for example, in the frame 36 above the inspection door 33, and the water in the washing tank 3 is circulated to constantly blow the flow on the rotating drum 21. It is considered as a structure. It is preferable that the running water chute 35 is arranged at a position where the water flow hits a position where the influence of the magnetism of the rotating drum 21 is not exerted. As a result, the residual work W that stays or adheres to the surface of the rotary drum 21 is easily dropped by the water flow, and the salt that has adhered to the rotary drum 21 and solidified can be dissolved.

Below the magnet separator 20, a residual product recovery tray 31 for recovering the residual product work W dropped from the rotary drum 21 is provided. The residual product collecting tray 31 is arranged at a position where it can receive the residual product work W scraped off from the magnet separator 20, for example, a position on the rear side from the vicinity of the rotation center of the magnet separator 20. In the case of the present embodiment, the residual product recovery tray 31 is configured by, for example, a box-shaped housing having an upper opening, and a furnace body is provided on a guide rail 32 that forms a part of a pedestal of the salt bath austempering quenching furnace 2. It is supported so that it can be moved in and out of the inside of the inspection door 33 of the salt bath 3 and is attached to the inside of the inspection door 33 of the salt bath 3. By pulling the inspection door 33 toward the front side around the hinge 34, the remaining item recovery tray 31 is pulled out. It is considered as a structure. Therefore, the inspection door 33 is provided so as to be taken out to the outside of the salt bath austemper quenching furnace 2 and to recover the residual work W by periodically opening the inspection door 33. In addition, when the remaining product recovery tray 31 is equipped with the running water chute 35, water drops together with the remaining work W, so it is preferable to provide a large number of holes for dropping only the water into the washing tank 3. ..

In the case of the present embodiment, the residual product recovery tray 31 is arranged below the magnet separator 20 and is provided so as to recover the residual product work W recovered by the magnetic separator 20 separately from the work W falling into the washing tank 3. Has been. Since the residual work W collected by the magnet separator 20 retains magnetism, it is handled as distinguished from a normal work, but in some cases, it is demagnetized and then dropped directly into the washing tank 3 to be collected. You may make it together with the done work. Of course, in some cases, the residual work W collected by the magnetic separator 20 may be dropped into the water washing tank 3 as it is and taken out from the water washing tank 3 via the drying device 4.

According to the salt bath austemper quenching furnace 2 configured as described above, the work after the austempering process is naturally dropped from the end of the belt conveyor 9 that is turned at the discharge port 10 while being affixed to the mesh belt 13. The residual work W that is going to return to the molten salt bath 8 while being attached is adsorbed on the rotary drum 21 by the attraction force of the magnet 22 of the opposing magnet separator 20 and peeled off from the mesh belt 13. At this time, since the magnet separator 20 is not in contact with the mesh belt 13, the residual work W attached to the mesh belt 13 can be peeled off without giving a bad influence such as impact to the mesh belt 13. You can

Since the magnet 22 is fixed in the rotary drum 21 and only the rotary drum 21 is rotating, the residual work W adsorbed on the surface of the rotary drum 21 rotates with the rotary drum 21 while the magnet 22 does not exist. When approaching (outside of the magnetic attraction range θ), the attraction force does not act, so that the non-magnetic rotary drum 21 slides down. Further, when the residual work W remains on the surface of the non-magnetic rotary drum 21 due to the attraction force of the magnet 22 at the end of the magnetic attraction range θ, the scraper 27 fixed to the surface of the rotary drum 21. It is forcibly scraped off by and is dropped on the remaining item recovery tray 31 to be recovered. Incidentally, the magnet separator 20 can be confirmed from the outlet inspection door 39 of the salt bath austemper quenching furnace 2, and the maintenance is easy.

The above-described embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention. For example, in the above-described embodiment, the magnet separator 20 is composed of the position-fixed permanent magnet 22 and the non-magnetic true circular rotating drum 21 that rotates around the permanent magnet 22, but the structure is not particularly limited to this structure. Rather, a magnetic separator using an annular endless belt (a non-circular non-circular non-magnetic work piece magnetic attraction member) that is stretched between a pair of rollers, or a magnetic separator using a relative moving magnetic attraction surface ( That is, a residual work magnetic attraction member made of a non-magnetic material is fixed, and the magnet is rotated to form a moving magnetic attraction surface). In other words, the magnetic separator magnetically attracts the residual product work W peeled off and collected from the mesh conveyor by moving the magnetic attraction surface formed on the surface of the residual product magnetic attraction member due to the magnetic attraction force. Anything can be used as long as it is transported outside the range and then dropped.

For example, as shown in FIG. 6, a non-magnetic annular endless belt 21 such as a flexible stainless steel belt or a silicone rubber belt, which is a residual work magnetic attraction member, is suspended between a pair of rollers 37 and 38 and driven. Alternatively, the permanent magnet 22 may be disposed between the pair of rollers 37 and 38 so that the magnetic attraction force is exhibited only in the area facing the permanent magnet 22. In this case, the annular endless belt 21 is preferably arranged in parallel with the mesh belt surface (not shown) on the return side of the belt conveyor. Since the residual product work W recovered from one roller side, for example, the roller 37 side, falls naturally, a residual product recovery tray (not shown) may be arranged below it. Further, it is preferable that the surface of the endless belt 21 is also provided with a scraper 27 so that the scrap work W can be forcibly removed even when the residual work W slides on the endless belt 21 due to magnetic attraction. Also in this case, the residual work W adhered to the mesh belt is attracted to the non-magnetic annular endless belt (remaining workpiece magnetic attraction member) 21 by the magnetic attraction force and peeled off, while the residual work W is adhered to the annular endless belt 21. The remaining work W can be placed and moved, and when it reaches a region (outside of the permanent magnet 22) where the attractive force does not act, it can be slid off from the surface of the annular endless belt 21 to be collected in the remaining collection tray.

Also, as a magnet separator, the magnetic attraction surface formed on the surface of the residual work magnetic attraction member is moved by moving the permanent magnet side with respect to the residual work magnetic attraction member made of a fixed non-magnetic material. Then, the residual work adsorbed from the mesh belt is slid on the residual work magnetic attraction member and moved to the area where it naturally falls, and then the gap between the magnet and the residual work magnetic attraction member is widened to attract force. You may make it fall by doing so. For example, a fixed non-magnetic table-type or drum-shaped residual work magnetic attraction member is provided with a permanent magnet that reciprocates or rotates, and the moving permanent magnet attracts the residual work to attract non-magnetic residual work. It is also possible to slide the surface of the product work magnetic attraction member so that the non-magnetic work product magnetic attraction member slides down from the inclined or curved end of the non-magnetic work product magnetic attraction member outside the moving range of the permanent magnet. In this case, the magnetic attraction surface is formed continuously on the surface of the residual work magnetic attraction member, or intermittently formed at intervals that do not cause defective peeling of the work. It is desirable to consider the layout. Further, a scraper that circulates along the surface of the fixed non-magnetic residual work magnetic attraction member is provided, and the residual work that remains on the surface of the residual work magnetic attraction member is scraped off and eliminated. You can also

2 Salt Bath Austemper Quenching Furnace 7 Salt Bath 8 Molten Salt Bath 9 Belt Conveyor 10 Discharge Port 13 Mesh Belt 20 Magnet Separator 21 Non-magnetic Remaining Workpiece Magnetic Adsorption Member (Rotating Drum)
22 Magnet 27 Scraper 31 Remaining Goods Collection Tray W Remaining Work

Claims (5)

A mesh that conveys the work inside the salt bath with a mesh conveyor over the time required for the austempering while immersing the work heated to the austenite region in a constant temperature molten salt bath, and changes the direction outside the molten salt bath. In a salt bath austemper quenching furnace that naturally drops from the conveyor to the discharge port,
The outlet of the salt tub is disposed opposite to the belt surface on the return side of the mesh conveyor , and remains to be returned to the molten salt bath while being stuck to the mesh conveyor without spontaneously dropping from the mesh conveyor. It is equipped with a magnetic separator that magnetically adsorbs the product work by stripping and collecting it from the mesh conveyor,
The magnet separator has a residual work magnetic attraction member made of a non- magnetic material, and a magnet that applies a magnetic attraction force to the surface of the residual work magnetic attraction member, and within a certain area of the residual work magnetic attraction member. When the magnetic attraction force reaches and the magnetic attraction force does not reach outside the range, and the magnetic attraction surface formed on the surface of the residual work magnetic attraction member moves due to the extension of the magnetic attraction force. A salt bath austempering quenching furnace, characterized in that the residual work stripped off from the mesh conveyor and collected is conveyed to a position outside the range of the magnetic attraction force and then dropped. The magnet separator has a remnant work magnetic attraction member composed of a non-magnetic rotating drum, and a magnet that is fixedly supported in a fixed position inside the rotating drum to give a magnetic attraction force. The salt bath austemper quenching furnace according to claim 1, wherein the salt bath austemper quenching furnace exhibits a magnetic attraction force within a certain region within the range, and exhibits no magnetic attraction force outside the range. The Zanpin workpiece is fixed moves along with the Zanpin workpiece magnetic attraction member to the surface of the magnetic attraction members, or the Zanpin scraper circulating moved along the surface of the work magnetic attraction member is provided, prior Symbol magnetic attraction 3. The salt bath austemper quenching furnace according to claim 1, wherein the residual work that stays on the residual work magnetic attraction member is forcibly scraped off. 4. The residual product work tray is provided with a residual product recovery tray for accommodating the residual product work falling from the magnetic attraction member and taking out the recovered residual product work from a route different from the outlet. Salt bath austemper quenching furnace described in No. 3. A running water chute for spraying a water flow to a position where the magnetic effect of the residual work magnetic attraction member is not exerted to drop the residual work that stays or adheres to the surface of the residual work magnetic attraction member. The salt bath austemper quenching furnace according to any one of 1 to 4.

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