WO2021130845A1 - Sintering furnace - Google Patents

Sintering furnace Download PDF

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Publication number
WO2021130845A1
WO2021130845A1 PCT/JP2019/050544 JP2019050544W WO2021130845A1 WO 2021130845 A1 WO2021130845 A1 WO 2021130845A1 JP 2019050544 W JP2019050544 W JP 2019050544W WO 2021130845 A1 WO2021130845 A1 WO 2021130845A1
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WO
WIPO (PCT)
Prior art keywords
radiant tube
furnace chamber
furnace
sintering
sintered
Prior art date
Application number
PCT/JP2019/050544
Other languages
French (fr)
Japanese (ja)
Inventor
史有 赤池
智之 小比田
和夫 岩崎
Original Assignee
昭和電工マテリアルズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 昭和電工マテリアルズ株式会社 filed Critical 昭和電工マテリアルズ株式会社
Priority to JP2021566421A priority Critical patent/JP7491319B2/en
Priority to PCT/JP2019/050544 priority patent/WO2021130845A1/en
Publication of WO2021130845A1 publication Critical patent/WO2021130845A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/20—Arrangements of heating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices

Definitions

  • the present invention relates to a sintering furnace for sintering an object to be sintered, and more particularly to a continuous type or batch type sintering furnace using a gas radiant tube burner.
  • a molded product placed on a mesh belt is transported in a furnace and heated by an electric heater such as a silicon carbide heating element to be sintered.
  • a furnace is provided (see, eg, Patent Document 1).
  • a sintering furnace using a gas as a heat source using a gas radiant tube burner or the like is being studied.
  • the gas radiant tube burner causes a high-temperature combustion gas generated by combustion of gas to flow into a pipe and releases radiant heat from the heated pipe (see Patent Document 2).
  • the combustion gas that heats the pipe flows along the pipe, the combustion gas is gradually cooled to generate a temperature gradient in the pipe, and the amount of heat of radiant heat emitted from the pipe also has a gradient along the pipe. It sometimes had a distribution. Therefore, when a gas radiant tube burner is used to heat the sintering furnace, it is difficult to keep the inside of the furnace at a uniform temperature.
  • the present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide a sintering furnace in which a gas radiant tube burner is used and the temperature inside the furnace is kept uniform.
  • the sintering furnace is a sintering furnace that continuously sinters objects to be sintered, and is formed so as to penetrate from the inlet to the outlet of the sintering furnace.
  • a plurality of radiant tube burners, including a burner, are arranged in parallel so that the directions extending from the base to the tip of the adjacent radiant tube and the radiant tube burner are reversed.
  • the plurality of radiant tube burners may be arranged in the furnace chamber so that the longitudinal direction from the base to the tip of each radiant tube is substantially orthogonal to the direction in which the sintered object is conveyed.
  • the furnace chamber includes a floor and a ceiling, and a plurality of radiant tube burners may be arranged along the floor and the ceiling of the furnace chamber.
  • the plurality of radiant tube burners may be arranged at opposite positions along the floor and ceiling of the furnace chamber with the transport mechanism in between, so that the directions of the facing radiant tubes are reversed.
  • the transport mechanism may be a roller type transport mechanism.
  • the furnace chamber may include a plurality of compartments separated by movable doors along a transport mechanism for transporting the sintered object.
  • the number of radiant tube burners placed in each compartment may be equal in the opposite directions.
  • the radiant tube burners arranged in each compartment may be arranged at substantially equal intervals along the direction in which the sintered object is conveyed along the floor and ceiling of the furnace chamber.
  • the transport mechanism may be a mesh belt type transport mechanism.
  • the transport mechanism may be a push tray type transport mechanism.
  • the furnace chamber may be formed by a furnace wall surrounding a transport mechanism for transporting the sintered object.
  • the sintering furnace is a sintering furnace that sinters an object to be sintered in a batch manner, and has a furnace chamber that can be opened and closed by a door and a support member that supports the object to be sintered in the furnace chamber. And a plurality of radiant tube burners arranged in the furnace chamber to heat the sintered object supported by the support member, the plurality of radiant tube burners from the base of the adjacent radiant tube and radiant tube burner. They are arranged in parallel so that the directions extending to the tip are reversed.
  • the plurality of radiant tube burners may be arranged so that the longitudinal direction from the base to the tip of each radiant tube is substantially orthogonal to the direction from the door of the furnace chamber to the back.
  • the furnace chamber includes a side wall, and a plurality of radiant tube burners may be arranged along the side wall of the furnace chamber.
  • the plurality of gas radiant tube burners may be arranged along the side wall of the furnace chamber so that the longitudinal direction is substantially vertical.
  • the plurality of radiant tube burners may be arranged at positions facing each other on the side walls of the furnace chamber with the support member interposed therebetween so that the directions of the facing radiant tube burners are reversed.
  • the number of radiant tube burners facing each other may be equal.
  • At least a part of the plurality of radiant tube burners may be arranged at substantially equal intervals along the direction from the door of the furnace chamber to the back.
  • the furnace chamber may be formed by a furnace wall surrounding a support member that supports the sintered object.
  • Multiple radiant tube burners include a double tube of an inner tube extending from the base to the tip and an outer tube with a closed tip, and inside the inner tube, combustion gas is generated by combustion from the base to the tip.
  • the outer pipe may be heated to generate radiant heat by returning the combustion gas discharged from the tip of the pipe to the base through the gap between the outer pipe and the inner pipe.
  • a gas radiant tube burner can be used in the sintering furnace to keep the temperature inside the furnace uniform.
  • the continuous sintering furnace using the roller type conveying mechanism is referred to as the first embodiment
  • the continuous type sintering furnace using the mesh belt type conveying mechanism is referred to as the second embodiment.
  • the embodiment and the batch type sintering furnace will be described in detail with reference to the drawings as the third embodiment.
  • a sintering furnace for sintering a sintered object formed by molding a powder metal will be described as an example, but the present invention is not limited to this, and the present invention can be applied to sintering other sintered objects.
  • the gas radiant tube burner will be simply referred to as a radiant tube burner.
  • FIG. 1 is a diagram showing a continuous sintering furnace 10 using a roller type conveying mechanism.
  • FIG. 1 (a) is a cross-sectional view of the sintering furnace 10 with a substantially horizontally extending cut surface
  • FIG. 1 (b) is a substantially vertical view shown by I (b) -I (b) in FIG. 1 (a). It is a cross-sectional view by a cut surface extending to.
  • the cut surface of the cross-sectional view of FIG. 1 (a) is shown by I (a) -I (a).
  • a furnace chamber 12 is formed so as to penetrate the furnace body, and in the furnace chamber 12, a plurality of metal or ceramic materials for carrying the sintered object from the inlet 12a to the outlet 12b are placed and conveyed.
  • a roller 13 is provided.
  • the continuous sintering furnace 10 using such a roller type conveying mechanism is sometimes called a roller hearth furnace.
  • the furnace chamber 12 is formed by a furnace wall 11 made of refractory bricks or the like constructed so as to surround the rollers 13 provided along the transport path of the sintered object from the top, bottom, left and right, and the rollers 13 are formed on the floor 12c of the furnace chamber 12. It is surrounded from all sides by the right side wall 12e and the left side wall 12f from the ceiling 12d and the entrance 12a toward the exit 12b.
  • the furnace chamber 12 is provided with a plurality of movable doors 14 that can move up and down to open or close the furnace chamber 12 along a transport path for the sintered object.
  • movable door 14 furnace chamber 12 from the inlet 12a towards the outlet 12b, first section 12 1, divided into each section of the second compartment 12, second and third sections 12, third and fourth compartments 12 4 Has been done.
  • the movable door 14 may be normally closed and opened when the sintered object conveyed by the roller 13 passes so as to maintain an atmosphere such as the temperature of each section.
  • FIG. 2 is a cross-sectional view showing a schematic configuration of the radiant tube burner 15.
  • the radiant tube burner 15 has a double tube of an inner tube 1 and an outer tube 2 made of a heat-resistant material such as silicon carbide or nickel.
  • a plurality of through holes 1a are formed in the inner pipe 1, and the outer pipe 2 is closed by providing a predetermined gap with the opening at the tip of the inner pipe 1.
  • the fuel gas supplied from the fuel supply passage 5 is ejected from the burner 3 provided in the pipe, and air is supplied from the air supply passage 6.
  • the mixture of fuel gas and air is ignited by the spark emitted from the spark rod 4 of the burner 3, the burning flame extends toward the tip of the inner pipe 1, and the high-temperature combustion gas is discharged from the opening at the tip of the inner pipe 1. , A part of the gas is discharged through the through hole 1a of the inner pipe 1.
  • the combustion gas discharged from the inner pipe 1 passes through the gap between the outer pipe 2 having a closed tip and the inner pipe 1, and returns to the base from the tip of the outer pipe 2 while heating the outer pipe 2.
  • the combustion gas that has returned to the base through the gap between the outer pipe 2 and the inner pipe 1 is discharged through the exhaust passage 7.
  • the radiant heat released from the outer pipe 2 heated by the combustion gas to the surroundings is used for heating.
  • the combustion gas discharged from the inner pipe 1 progresses while heating the outer pipe 2 from the tip toward the base, and the temperature gradually decreases, and the temperature gradually decreases toward the base from the tip of the outer pipe 2.
  • the temperature gradually decreases and a temperature gradient occurs. Therefore, the distribution of the amount of radiant heat emitted from the radiant tube burner 15 also has a gradient that gradually decreases from the tip to the base.
  • the through hole 1a formed in the inner tube 1 of the radiant tube burner 15 has an effect of gentlening the inclination of the temperature gradient.
  • the double pipes of the inner pipe 1 and the outer pipe 2 are inserted into the furnace chamber 12 from the outside of the sintering furnace 10 through the holes formed in the furnace wall 11 of the sintering furnace 10 to be exposed, and the radiant heat is radiated.
  • the outer pipe 2 for discharging the above material is installed so as to extend directly below or directly above the transport path of the object to be sintered by the roller 13 provided in the furnace chamber 12.
  • the supply of fuel gas to the radiant tube burner 15 through the fuel supply path 5 and the supply of air through the air supply path 6 are controlled by a solenoid valve (not shown), and the degree of combustion intensity of the burner 3 and ignition and fire extinguishing are controlled. Will be done.
  • the furnace chamber Radiant tube burners 15 are arranged along the floor 12c and the ceiling 12d of the twelve. Further, in the fourth compartment 12 4, radiant tube burner 15 along the floor 12c of the furnace chamber 12 is arranged. In these radiant tube burners 15, the longitudinal direction from the base to the tip of the radiant tube burner 15 is such that the longitudinal direction is orthogonal to the direction of the transport path in which the sintered object is conveyed by the roller 13. Have been placed. When the transport path is in a substantially horizontal plane, the longitudinal direction may be in a substantially horizontal plane.
  • the left-facing radiant tube burner 15 installed on the right side wall 12e of the furnace chamber 12 and the tip facing the left side wall 12f, and the furnace chamber 12
  • a right-facing radiant tube burner 15 installed on the left side wall 12f and whose tip faces the right wall 12e.
  • the radiant tube burner 15 arranged along the floor 12c of the furnace chamber 12 is directed from the inlet 12a of the furnace chamber 12 toward the outlet 12b so that the directions of the radiant tube burner 15 and the adjacent radiant tube burner 15 are opposite to each other in the right direction and the left direction.
  • Radiant tube burners 15 facing right and facing left are alternately arranged in parallel along a transport path through which the object to be sintered is transported.
  • the parallel arrangement may be a substantially parallel arrangement with a predetermined distance between them, and the parallel arrangement in the opposite direction may be referred to as antiparallel.
  • the radiant tube burner 15 arranged along the ceiling 12d of the furnace chamber 12 has an inlet 12a to an outlet 12b of the furnace chamber 12 so that the directions of the radiant tube burner 15 and the adjacent radiant tube burner 15 are opposite to each other in the right direction and the left direction.
  • Radiant tube burners 15 facing right and facing left are alternately arranged in parallel along a transport path in which the object to be sintered is conveyed toward.
  • the first compartment 12 1 of the furnace chamber 12, in the second compartment 12, second and third sections 12 3, radiant tube burners 15 arranged along the floor 12c and the ceiling 12d of the furnace chamber 12 is at least partially baked It is arranged at approximately equal intervals along the direction of the transport path for transporting the object to be connected.
  • the first compartment 12 1 of the furnace chamber 12, in the second compartment 12, second and third sections 12 3, radiant tube burners 15, sandwiched therebetween in the furnace chamber 12 bed conveyance path of the sintered object by roller 13 They are arranged in parallel at opposite positions of the 12c and the ceiling 12d so that the directions of the right direction and the left direction are opposite to each other.
  • first section 12 1 of the furnace chamber 12, in each compartment to the second compartment 12, second and third sections 12 3, the radiant tube burner 15 located in the radiant tube burner 15 and left disposed rightward The numbers are equal.
  • first section 12 1 a second compartment 12, second and third sections 12, third and fourth by radiant tube burner 15 located in compartment 12 4, sintered metal objects powder molded product is baked appropriately
  • Each compartment is maintained at a suitable uniform temperature so that it is tied.
  • the first compartment 12 1 is maintained at about 800 ° C. as a degreasing zone for removing the resin contained in the metal powder molded product
  • the second compartment 12 2 is maintained at about 950 ° C. as a pretropical zone
  • the third compartment 12 3 is maintained. is maintained substantially 1150 ° C. as the sintering zone
  • the fourth compartment 12 4 may be maintained in a substantially 650 ° C. as slow cooling zone.
  • the radiant tube burners 15 are arranged in parallel so that the directions of the adjacent radiant tube burners 15 are reversed with respect to the direction in which the radiant tube burners 15 extend from the base to the tip. Therefore, with respect to the radiant tube burner 15 in which the temperature gradually decreases from the tip to the base and the distribution of the amount of heat of radiant heat also gradually decreases from the tip to the base, the pair of adjacent radiant tube burners 15 compensate each other, and the pair The radiant tube burner 15 can emit radiant heat with a substantially uniform distribution of heat in the longitudinal direction.
  • the radiant tube burner 15 faces right and left along the transport path in which the sintered object is conveyed from the inlet 12a to the outlet 12b of the furnace chamber 12 along the floor 12c or the ceiling 12d of the furnace chamber 12.
  • Radiant tube burners 15 are arranged in parallel alternately. Therefore, a pair of adjacent radiant tube burners 15 compensate each other, and the furnace chamber 12 is maintained at a uniform temperature in the width direction. Therefore, it is guaranteed that the object to be sintered placed on the roller 13 is uniformly sintered even if the position is deviated from the center of the roller 13 to either the right side wall 12e or the left side wall 12f of the furnace chamber 12. Will be done.
  • some radiant tube burners 15 are arranged in parallel so that the right direction and the left direction are opposite to each other at the positions facing the floor 12c and the ceiling 12d of the furnace chamber 12 with the roller 13 interposed therebetween.
  • the pair of the radiant tube burners 15 facing each other compensate each other, and the furnace chamber 12 is maintained at a uniform temperature in the height direction. Therefore, the height of the object to be sintered placed on the roller 13 is large, and it is guaranteed that the object to be sintered is uniformly sintered even if the object to be sintered extends from the mounting surface of the roller 13 in the height direction.
  • FIG. 3 (a) is a cross-sectional view of the sintering furnace 20 with a substantially horizontally extending cut surface
  • FIG. 3 (b) is a substantially vertical view shown by III (b) -III (b) in FIG. 3 (a).
  • FIG. 4 is a cross-sectional view taken along the cut surface extending substantially vertically shown by IV-IV in FIG. 3 (a).
  • III (a) -III (a) the cut surface of the cross-sectional view of FIG. 3 (a) is shown by III (a) -III (a).
  • a furnace chamber 22 is formed so as to penetrate the furnace body, and the furnace chamber 22 is provided with a mesh belt 23 on which an object to be sintered is placed and conveyed from the inlet 22a to the outlet 22b.
  • a metal or ceramic muffle 27 is formed in a tunnel shape surrounding the mesh belt 23 so as to cover the transport path of the sintered object conveyed by the mesh belt 23, and the sintered object by the mesh belt 23 is formed.
  • the transport path extends within the muffle 27.
  • the furnace chamber 22 is formed by a furnace wall 21 made of refractory bricks or the like constructed so as to surround the muffle 27 extending from above, below, left and right so as to cover the transport path of the sintered object.
  • the muffle 27 is surrounded from all sides by the floor 22c of the furnace chamber 22, the ceiling 22d, the right side wall 22e and the left side wall 22f from the inlet 22a toward the outlet 22b, and further by the inlet side wall 22g of the inlet 22a and the outlet side wall 22h of the outlet 22b. Is also surrounded.
  • support walls 26 having a predetermined height are formed at predetermined intervals along the transport path of the sintered object to support the bottom of the muffle 27.
  • the muffle 27 isolates the atmosphere of the transport path in the muffle 27 to which the object to be sintered is transported by the mesh belt 23 from the atmosphere of the furnace chamber 22.
  • the atmosphere in the muffle 27 can be set to a desired atmosphere suitable for the object to be sintered.
  • the sintered object placed on the mesh belt 23 in the muffle 27 and conveyed is heated by the radiant heat emitted from the wall surface of the muffle 27.
  • the furnace chamber 22 is provided with a radiant tube burner 25.
  • the radiant tube burner 25 has the same configuration as the radiant tube burner 15 of the first embodiment shown in FIG.
  • the radiant tube burner 25 has a double pipe of an inner pipe and an outer pipe, and the burning flame extends toward the tip of the inner pipe, and high-temperature combustion gas is discharged from the opening at the tip of the inner pipe, and a part thereof Gas is discharged through the through hole of the inner pipe.
  • the combustion gas discharged from the inner pipe passes through the gap between the outer pipe and the inner pipe whose tip is closed, returns to the base from the tip of the outer pipe while heating the outer pipe, and the temperature gradually decreases from the tip to the base. Then a temperature gradient is generated. Therefore, the distribution of the amount of radiant heat emitted from the radiant tube burner 25 also has a gradient that gradually decreases from the tip to the base.
  • the radiant tube burner 25 is inserted into the furnace chamber 22 from the outside of the sintering furnace 20 through a hole formed in the furnace wall 21 of the sintering furnace 20 to be exposed, and crosses directly below or directly above the muffle 27 in the furnace chamber 22. It is installed so as to extend.
  • the supply of fuel gas and the supply of air to the radiant tube burner 25 are controlled by an electromagnetic valve (not shown), and the degree of combustion intensity, ignition and fire extinguishing of the radiant tube burner 25 are controlled.
  • a radiant tube burner 25 is arranged along the floor 22c and the ceiling 22d of the furnace chamber 22 so as to sandwich the muffle 27 from above and below.
  • the longitudinal direction of these radiant tube burners 25 from the base to the tip of the radiant tube burner 25 is orthogonal to the direction of the transport path in which the object to be sintered is transported by the mesh belt 23 in the muffle 27. It is arranged so that it faces the direction.
  • the longitudinal direction may be in a substantially horizontal plane.
  • the direction of extending from the base of the radiant tube burner 25 to the tip is the left-facing radiant tube burner 25 installed on the right side wall 22e of the furnace chamber 22 and the tip facing the left side wall 22f, and the furnace chamber 22.
  • a radiant tube burner 25 that is installed on the left side wall 22f and whose tip faces the right side wall 22e and faces to the right.
  • the radiant tube burner 25 arranged along the floor 22c of the furnace chamber 22 is directed from the inlet 22a of the furnace chamber 22 toward the outlet 22b so that the direction of the adjacent radiant tube burner 25 is opposite to that of the adjacent radiant tube burner 25 in the right direction and the left direction.
  • Right-facing and left-facing radiant tube burners 25 are alternately arranged in parallel in the muffle 27 along a transport path through which the sintered object is transported.
  • the parallel arrangement may be a substantially parallel arrangement with a predetermined distance between them, and the parallel arrangement in the opposite direction may be referred to as antiparallel.
  • the radiant tube burner 25 arranged along the ceiling 22d of the furnace chamber 22 has an inlet 22a to an outlet 22b of the furnace chamber 22 so that the directions of the radiant tube burner 25 and the adjacent radiant tube burner 25 are opposite to each other in the right direction and the left direction.
  • Radiant tube burners 25 facing right and facing left are alternately arranged in parallel along the transport path in which the object to be sintered is transported in the muffle 27.
  • the radiant tube burners 25 arranged along the floor 22c and the ceiling 22d of the furnace chamber 22 are arranged at substantially equal intervals along the direction of the transport path in which the sintered object is conveyed in the muffle 27. Have been placed. Further, in the furnace chamber 22, the radiant tube burner 25 faces right and left at opposite positions of the floor 22c and the ceiling 22d of the furnace chamber 22 with the muffle 27 covering the conveying path of the sintered object interposed therebetween. They are arranged in parallel so that they are reversed. Therefore, in the furnace chamber 22, the number of the radiant tube burners 25 arranged to the right and the number of the radiant tube burners 25 arranged to the left are equal.
  • the furnace chamber 22 is maintained at an appropriate uniform temperature so that the metal powder molded product of the object to be sintered is appropriately sintered by the radiant tube burner 25 arranged in the furnace chamber 22. Further, in the furnace chamber 22, the transport path in which the object to be sintered is placed on the mesh belt 23 and transported is covered with a tunnel-shaped muffle 27. The atmosphere inside the muffle 27 can be set to an atmosphere suitable for the metal powder molded product of the sintered object.
  • the radiant tube burners 25 are arranged in parallel so that the directions of the adjacent radiant tube burners 25 are reversed with respect to the direction in which the radiant tube burners 25 extend from the base to the tip. Therefore, with respect to the radiant tube burner 25 in which the temperature gradually decreases from the tip to the base and the distribution of the amount of heat of radiant heat also gradually decreases from the tip to the base, the pair of adjacent radiant tube burners 25 compensate each other and the pair The radiant tube burner 25 can emit radiant heat with a substantially uniform distribution of heat in the longitudinal direction.
  • the radiant tube burner 25 is carried along the floor 22c or the ceiling 22d of the furnace chamber 22 from the inlet 22a to the outlet 22b of the furnace chamber 22 along the transport path in which the sintered object is conveyed in the muffle 27.
  • the right-facing and left-facing radiant tube burners 25 are alternately arranged in parallel. Therefore, the pair of adjacent radiant tube burners 25 compensate each other, the furnace chamber 22 is maintained at a uniform temperature in the width direction, and the wall surface of the muffle 27 is also irradiated with uniform radiant heat in the width direction.
  • the radiant tube burner 25 is arranged in parallel at positions facing the floor 22c and the ceiling 22d of the furnace chamber 22 with the roller 23 interposed therebetween so that the right and left directions are opposite to each other.
  • the pair of radiant tube burners 25 facing each other compensate each other, the furnace chamber 22 is maintained at a uniform temperature in the height direction, and the temperature is kept uniform in the height direction from the wall surface of the muffle 27 in the height direction. Uniform radiant heat is applied. Therefore, the height of the sintered object mounted on the mesh belt 23 and conveyed in the muffle 27 is large, and even if the sintered object extends in the height direction from the mounting surface of the mesh belt 23, it is uniform. Guaranteed to be sintered.
  • the transport path of the sintered object to be transported by placing it on the mesh belt 23 from the inlet 22a to the outlet 22b of the furnace chamber 22 is the muffle 27. It was covered by, but it is not limited to such a configuration.
  • the muffle 27 may not be provided in the furnace chamber 22 of the sintering furnace 20, and the transfer mechanism of the sintered object by the mesh belt 23 may be exposed in the furnace chamber 22.
  • the radiant tube burner 25 directly faces the object to be sintered, so that the object to be sintered can be efficiently heated by the radiant heat emitted from the radiant tube burner 25. ..
  • the tray on which the object to be sintered is placed is continuously pushed from the inlet 22a of the furnace chamber 22 by the tray pusher so that the object to be sintered is inside the muffle 27.
  • FIG. 5 is a diagram showing a batch type sintering furnace 30.
  • FIG. 5 (a) is a cross-sectional view of the sintering furnace 30 with a substantially horizontally extending cut surface
  • FIG. 5 (b) is a substantially vertical view shown by V (b) -V (b) in FIG. 5 (a). It is a cross-sectional view by a cut surface extending to.
  • the cut surface of the cross-sectional view of FIG. 5 (a) is shown by V (a) -V (a).
  • the sintering furnace 30 is formed with a furnace chamber 32 that can be opened and closed by a door 39.
  • the furnace chamber 32 is constructed by a furnace wall 31 made of refractory bricks or the like, and faces the right wall 32c, the left wall 32d, and the door 39 from the floor 32a, the ceiling 32b, and the door 39 of the furnace wall 31 toward the back of the furnace chamber 32. It is surrounded by the innermost wall 32e.
  • a base 36 made of refractory bricks or the like is provided for placing an object to be sintered.
  • the furnace chamber 32 is provided with a radiant tube burner 35 for heating the furnace chamber 32.
  • the radiant tube burner 35 has the same configuration as the radiant tube burner 15 of the first embodiment shown in FIG.
  • the radiant tube burner 35 has a double pipe of an inner pipe and an outer pipe, and the burning flame extends toward the tip of the inner pipe, and high-temperature combustion gas is discharged from the opening at the tip of the inner pipe, and a part thereof. Gas is discharged through the through hole of the inner pipe.
  • the combustion gas discharged from the inner pipe passes through the gap between the outer pipe and the inner pipe whose tip is closed, returns to the base from the tip of the outer pipe while heating the outer pipe, and the temperature gradually decreases from the tip to the base. Then a temperature gradient is generated. Therefore, the distribution of the amount of radiant heat emitted from the radiant tube burner 35 also has a gradient that gradually decreases from the tip to the base.
  • the radiant tube burner 35 is arranged along the right side wall 32c and the left side wall 32d of the furnace chamber 32.
  • the radiant tube burner 35 is arranged so that the direction from the base to the tip of the radiant tube burner 35 is the longitudinal direction, and the longitudinal direction thereof is orthogonal to the direction from the door 39 to the back of the furnace chamber 32. ..
  • the longitudinal direction of the radiant tube burner 35 may be a substantially vertical direction.
  • the radiant tube burner 35 installed on the floor 32a of the furnace chamber 32 and upward in the substantially vertical direction so that the tip faces the ceiling 32b,
  • a radiant tube burner 35 which is installed on the ceiling 32b of the furnace chamber 32 and whose tip is directed downward in a substantially vertical direction toward the floor 32a.
  • the radiant tube burner 35 arranged along the right side wall 32c of the furnace chamber 32 faces from the door 39 of the furnace chamber 32 toward the back so that the direction of the radiant tube burner 35 is opposite to that of the adjacent radiant tube burner 35.
  • the upward and downward radiant tube burners 35 are alternately arranged in parallel.
  • the radiant tube burner 35 arranged along the right side wall 32c of the furnace chamber 32 is located behind the door 39 of the furnace chamber 32 so that the direction of the radiant tube burner 35 is opposite to that of the adjacent radiant tube burner 35. Radiant tube burners 35 facing upward and downward are alternately arranged in parallel.
  • the radiant tube burners 35 arranged along the right side wall 32c and the left side wall 32d of the furnace chamber 32 are arranged at substantially equal intervals from the door 39 of the furnace chamber 32 toward the back. Further, in the furnace chamber 32, the radiant tube burner 35 is arranged in parallel at positions facing the right side wall 32c and the left side wall 32d of the furnace chamber 32 so that the upward and downward directions are opposite to each other. There is. Therefore, in the furnace chamber 32, the numbers of the radiant tube burners 35 arranged upward and the radiant tube burners 35 arranged downward are equal.
  • the radiant tube burner 35 arranged in this way maintains the furnace chamber 32 at an appropriate uniform temperature so that the metal powder molded product of the object to be sintered is properly sintered.
  • the degreasing step of removing the resin contained in the metal powder molded product in the first step is maintained at about 800 ° C.
  • the preheating step of the second step is maintained at about 950 ° C.
  • the sintering step of the third step is omitted.
  • a plurality of steps may be sequentially carried out so as to maintain the temperature at 1150 ° C. and maintain the temperature at a desired temperature at predetermined time intervals so as to maintain the temperature at about 650 ° C. as the slow cooling step of the fourth step.
  • the radiant tube burners 35 are arranged in parallel so that the directions of the adjacent radiant tube burners 35 are reversed with respect to the direction in which the radiant tube burners 35 extend from the base to the tip. Therefore, for the radiant tube burner 35 in which the temperature gradually decreases from the tip to the base and the distribution of the amount of heat of radiant heat also gradually decreases from the tip to the base, the pair of adjacent radiant tube burners 35 compensate each other and the pair.
  • the radiant tube burner 35 can emit radiant heat with a substantially uniform distribution of heat in the longitudinal direction.
  • the radiant tube burner 35 is arranged along the right side wall 32c or the left side wall 32d of the furnace chamber 32, and the radiant tube burners 35 facing upward and downward are alternately arranged in parallel from the door 39 of the furnace chamber 32 toward the back. Has been done. Therefore, even if a pair of adjacent radiant tube burners 35 compensate each other and the position of the sintered object placed on the table 36 moves toward the back from the door 39 of the furnace chamber 32, the furnace chamber 32 remains in this position. It is guaranteed to be uniformly sintered because it is kept at a uniform temperature in the direction.
  • the radiant tube burner 35 is arranged in parallel at positions facing the right side wall 32c and the left side wall 32d of the furnace chamber 32 so that the upward and downward directions are opposite to each other.
  • the pair of the radiant tube burners 35 facing each other compensate each other, and the sintered object placed on the table 36 is between the right side wall 32c and the left side wall 32d of the furnace chamber 32. Even if the position is moved, the furnace chamber 32 is maintained at a uniform temperature in this direction, so that it is guaranteed that the furnace chamber 32 is uniformly sintered.
  • the present invention can be used for sintering an object to be sintered, for example, sintering a powdered metal molded product.

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Abstract

The present invention includes: a furnace chamber (12) that is formed so as to penetrate from the inlet (12a) to the outlet (12b) of a sintering furnace (10); a roller (13) that conveys an object to be sintered from the inlet (12a) to the outlet (12b) through the furnace chamber (12); and a plurality of radiant tube burners (15) that are arranged in the furnace chamber (12) so as to heat the conveyed object to be sintered. The radiant tube burners (15) are arranged in parallel in such a manner that adjacent radiant tubes (15) extend from the base to the leading end in opposite directions. The furnace chamber (12) is formed by a furnace wall (11) surrounding the roller (13), and the radiant tube burners (13) may be arranged along the floor (12c) and ceiling (12d) of the furnace chamber (12) so that the longitudinal direction from the bases to the leading ends of the radiant tube burners (13) is substantially orthogonal to the direction in which the object to be sintered is conveyed.

Description

焼結炉Sintering furnace
　この発明は、焼結対象物を焼結する焼結炉に関し、詳しくはガスラジアントチューブバーナーを用いる連続式又はバッチ式の焼結炉に関する。 The present invention relates to a sintering furnace for sintering an object to be sintered, and more particularly to a continuous type or batch type sintering furnace using a gas radiant tube burner.
　従来、粉末金属の成形品などを焼結するために、メッシュベルトに載置した成形品を炉内で搬送し、炭化けい素発熱体などの電気ヒーターで加熱して焼結する連続式の電気炉が提供されている（例えば特許文献１を参照）。電気炉の電力使用量を削減して省エネルギーを図る観点から、ガスラジアントチューブバーナーなどを用いたガスを熱源とする焼結炉が研究されている。ガスラジアントチューブバーナーは、ガスの燃焼により発生した高温の燃焼ガスを管内に流し、加熱した管から輻射熱を放出させる（特許文献２を参照）。 Conventionally, in order to sinter a molded product of powdered metal, a molded product placed on a mesh belt is transported in a furnace and heated by an electric heater such as a silicon carbide heating element to be sintered. A furnace is provided (see, eg, Patent Document 1). From the viewpoint of reducing the amount of electric power used in an electric furnace to save energy, a sintering furnace using a gas as a heat source using a gas radiant tube burner or the like is being studied. The gas radiant tube burner causes a high-temperature combustion gas generated by combustion of gas to flow into a pipe and releases radiant heat from the heated pipe (see Patent Document 2).
特開２０１７－９２２７号公報JP-A-2017-9227 特開平２－１７８５０３号公報Japanese Unexamined Patent Publication No. 2-178503
　ところで、ガスラジアントチューブバーナーは、管を加熱する燃焼ガスを管に沿って流し、燃焼ガスは次第に冷却されて管に温度勾配が生じ、管から放出される輻射熱の熱量も管に沿って勾配を有する分布になることがあった。このため、焼結炉を加熱するためにガスラジアントチューブバーナーを使用すると、炉内を均一な温度に保つことは難しかった。 By the way, in the gas radiant tube burner, the combustion gas that heats the pipe flows along the pipe, the combustion gas is gradually cooled to generate a temperature gradient in the pipe, and the amount of heat of radiant heat emitted from the pipe also has a gradient along the pipe. It sometimes had a distribution. Therefore, when a gas radiant tube burner is used to heat the sintering furnace, it is difficult to keep the inside of the furnace at a uniform temperature.
　この発明は、上述の実情に鑑みて提案されるものであって、ガスラジアントチューブバーナーを使用し、炉内の温度を均一に保つようにした焼結炉を提供することを目的とする。 The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide a sintering furnace in which a gas radiant tube burner is used and the temperature inside the furnace is kept uniform.
　上述の課題を解決するために、この出願に係る焼結炉は、焼結対象物を連続式に焼結する焼結炉であって、焼結炉の入口から出口まで貫通するように形成された炉室と、焼結対象物を入口から出口まで炉室を通って搬送する搬送機構と、搬送機構によって搬送される焼結対象物を加熱するように炉室に配置された複数のラジアントチューブバーナーとを含み、複数のラジアントチューブバーナーは、隣接するラジアントチューブとラジアントチューブバーナーの基部から先端に延びる向きが逆になるよう並行して配置されたものである。 In order to solve the above-mentioned problems, the sintering furnace according to this application is a sintering furnace that continuously sinters objects to be sintered, and is formed so as to penetrate from the inlet to the outlet of the sintering furnace. A furnace chamber, a transport mechanism for transporting the sintered object from the inlet to the outlet through the furnace chamber, and a plurality of radiant tubes arranged in the furnace chamber so as to heat the sintered object transported by the transport mechanism. A plurality of radiant tube burners, including a burner, are arranged in parallel so that the directions extending from the base to the tip of the adjacent radiant tube and the radiant tube burner are reversed.
　複数のラジアントチューブバーナーは、各ラジアントチューブの基部から先端に向かう長手方向が焼結対象物の搬送される方向に略直交するように炉室に配置されてもよい。炉室は、床及び天井を含み、複数のラジアントチューブバーナーは、炉室の床及び天井に沿って配置されてもよい。複数のラジアントチューブバーナーは、搬送機構を挟んで炉室の床及び天井に沿った対向する位置に、当該対向するラジアントチューブの向きが逆になるように配置されてもよい。 The plurality of radiant tube burners may be arranged in the furnace chamber so that the longitudinal direction from the base to the tip of each radiant tube is substantially orthogonal to the direction in which the sintered object is conveyed. The furnace chamber includes a floor and a ceiling, and a plurality of radiant tube burners may be arranged along the floor and the ceiling of the furnace chamber. The plurality of radiant tube burners may be arranged at opposite positions along the floor and ceiling of the furnace chamber with the transport mechanism in between, so that the directions of the facing radiant tubes are reversed.
　搬送機構は、ローラー式搬送機構であってもよい。炉室は、焼結対象物を搬送する搬送機構に沿って可動扉によって区切られた複数の区画を含んでもよい。各区画に配置されたラジアントチューブバーナーは、互いに逆に向いたものの数が等しくてもよい。各区画に配置されたラジアントチューブバーナーは、炉室の床及び天井に沿って焼結対象物が搬送される方向に沿って略等しい間隔で配置されてもよい。 The transport mechanism may be a roller type transport mechanism. The furnace chamber may include a plurality of compartments separated by movable doors along a transport mechanism for transporting the sintered object. The number of radiant tube burners placed in each compartment may be equal in the opposite directions. The radiant tube burners arranged in each compartment may be arranged at substantially equal intervals along the direction in which the sintered object is conveyed along the floor and ceiling of the furnace chamber.
　搬送機構は、メッシュベルト式搬送機構であってもよい。搬送機構は、プッシュトレー式搬送機構であってもよい。 The transport mechanism may be a mesh belt type transport mechanism. The transport mechanism may be a push tray type transport mechanism.
　搬送機構によって搬送される焼結対象物の搬送路を取り囲んで覆うように形成されたマッフルをさらに含んでもよい。炉室は、焼結対象物を搬送する搬送機構を取り囲む炉壁によって形成されてもよい。 It may further include a muffle formed so as to surround and cover the transport path of the sintered object transported by the transport mechanism. The furnace chamber may be formed by a furnace wall surrounding a transport mechanism for transporting the sintered object.
　また、この出願に係る焼結炉は、焼結対象物をバッチ式に焼結する焼結炉であって、扉で開閉可能な炉室と、炉室内で焼結対象物を支持する支持部材と、支持部材によって支持された焼結対象物を加熱するように炉室に配置された複数のラジアントチューブバーナーとを含み、複数のラジアントチューブバーナーは、隣接するラジアントチューブとラジアントチューブバーナーの基部から先端に延びる向きが逆になるように並行して配置されたものである。 Further, the sintering furnace according to this application is a sintering furnace that sinters an object to be sintered in a batch manner, and has a furnace chamber that can be opened and closed by a door and a support member that supports the object to be sintered in the furnace chamber. And a plurality of radiant tube burners arranged in the furnace chamber to heat the sintered object supported by the support member, the plurality of radiant tube burners from the base of the adjacent radiant tube and radiant tube burner. They are arranged in parallel so that the directions extending to the tip are reversed.
　複数のラジアントチューブバーナーは、各ラジアントチューブの基部から先端に向かう長手方向が炉室の扉から奥に向かう方向に略直交するように配置されてもよい。炉室は、側壁を含み、複数のラジアントチューブバーナーは、炉室の側壁に沿って配置されてもよい。複数のガスラジアントチューブバーナーは、長手方向が略鉛直方向になるように炉室の側壁に沿って配置されてもよい。 The plurality of radiant tube burners may be arranged so that the longitudinal direction from the base to the tip of each radiant tube is substantially orthogonal to the direction from the door of the furnace chamber to the back. The furnace chamber includes a side wall, and a plurality of radiant tube burners may be arranged along the side wall of the furnace chamber. The plurality of gas radiant tube burners may be arranged along the side wall of the furnace chamber so that the longitudinal direction is substantially vertical.
　複数のラジアントチューブバーナーは、支持部材を挟んで炉室の側壁の対向する位置に、当該対向するラジアントチューブバーナーの向きが逆になるように配置されてもよい。複数のラジアントチューブバーナーは、互いに逆に向いたものの数が等しくてもよい。複数のラジアントチューブバーナーの少なくとも一部は、炉室の扉から奥に向かう方向に沿って略等しい間隔で配置されてもよい。 The plurality of radiant tube burners may be arranged at positions facing each other on the side walls of the furnace chamber with the support member interposed therebetween so that the directions of the facing radiant tube burners are reversed. The number of radiant tube burners facing each other may be equal. At least a part of the plurality of radiant tube burners may be arranged at substantially equal intervals along the direction from the door of the furnace chamber to the back.
　炉室は、焼結対象物を支持する支持部材を取り囲む炉壁によって形成されてもよい。 The furnace chamber may be formed by a furnace wall surrounding a support member that supports the sintered object.
　複数のラジアントチューブバーナーは、基部から先端に向けて延びる内管及び先端が閉じた外管の二重管を含み、内管の内部で基部から先端に向けて燃焼により燃焼ガスを発生させ、内管の先端から排出された燃焼ガスを外管と内管との間隙を通して基部に戻すことにより外管を加熱して輻射熱を発生させてもよい。 Multiple radiant tube burners include a double tube of an inner tube extending from the base to the tip and an outer tube with a closed tip, and inside the inner tube, combustion gas is generated by combustion from the base to the tip. The outer pipe may be heated to generate radiant heat by returning the combustion gas discharged from the tip of the pipe to the base through the gap between the outer pipe and the inner pipe.
　この発明によると、焼結炉にガスラジアントチューブバーナーを使用し、炉内の温度を均一に保つようにすることができる。 According to this invention, a gas radiant tube burner can be used in the sintering furnace to keep the temperature inside the furnace uniform.
第１の実施の形態の連続式の焼結炉を示す図である。It is a figure which shows the continuous type sintering furnace of 1st Embodiment. ラジアントチューブバーナーを示す断面図である。It is sectional drawing which shows the radiant tube burner. 第２の実施の形態の連続式の焼結炉を示す図である。It is a figure which shows the continuous type sintering furnace of the 2nd Embodiment. 第２の実施の形態の連続式の焼結炉を示す図である。It is a figure which shows the continuous type sintering furnace of the 2nd Embodiment. 第３の実施の形態のバッチ式の焼結炉を示す図である。It is a figure which shows the batch type sintering furnace of the 3rd Embodiment.
　以下、焼結炉の実施の形態について、ローラー式搬送機構を用いた連続式の焼結炉を第１の実施の形態、メッシュベルト式搬送機構を用いた連続式の焼結炉を第２の実施の形態、バッチ式の焼結炉を第３の実施の形態として図面を参照して詳細に説明する。実施の形態では、粉末金属を成形した焼結対象物を焼結する焼結炉を例示して説明するが、これに限らず他の焼結対象物の焼結にも適用することができる。なお、以下ではガスラジアントチューブバーナーのことを単にラジアントチューブバーナーと称することにする。 Hereinafter, regarding the embodiment of the sintering furnace, the continuous sintering furnace using the roller type conveying mechanism is referred to as the first embodiment, and the continuous type sintering furnace using the mesh belt type conveying mechanism is referred to as the second embodiment. The embodiment and the batch type sintering furnace will be described in detail with reference to the drawings as the third embodiment. In the embodiment, a sintering furnace for sintering a sintered object formed by molding a powder metal will be described as an example, but the present invention is not limited to this, and the present invention can be applied to sintering other sintered objects. In the following, the gas radiant tube burner will be simply referred to as a radiant tube burner.
　（第１の実施の形態）
　図１は、ローラー式搬送機構を用いた連続式の焼結炉１０を示す図である。図１（ａ）は焼結炉１０の略水平に延びる切断面による断面図であり、図１（ｂ）は図１（ａ）におけるＩ（ｂ）－Ｉ（ｂ）で示された略鉛直に延びる切断面による断面図である。図１（ｂ）には、図１（ａ）の断面図の切断面がＩ（ａ）－Ｉ（ａ）により示されている。 (First Embodiment)
FIG. 1 is a diagram showing a continuous sintering furnace 10 using a roller type conveying mechanism. FIG. 1 (a) is a cross-sectional view of the sintering furnace 10 with a substantially horizontally extending cut surface, and FIG. 1 (b) is a substantially vertical view shown by I (b) -I (b) in FIG. 1 (a). It is a cross-sectional view by a cut surface extending to. In FIG. 1 (b), the cut surface of the cross-sectional view of FIG. 1 (a) is shown by I (a) -I (a).
　焼結炉１０には、炉体を貫通するように炉室１２が形成され、炉室１２には入口１２ａから出口１２ｂまで焼結対象物を載置して搬送する金属又はセラミック製の複数のローラー１３が設けられている。このようなローラー式搬送機構を用いた連続式の焼結炉１０は、ローラーハース炉と称されることもある。炉室１２は焼結対象物の搬送路に沿って設けられたローラー１３を上下左右から取り囲むように築かれた耐火煉瓦等による炉壁１１によって形成され、ローラー１３は炉室１２の床１２ｃ、天井１２ｄ、入口１２ａから出口１２ｂに向かって右側壁１２ｅ及び左側壁１２ｆによって四方から取り囲まれている。 In the sintering furnace 10, a furnace chamber 12 is formed so as to penetrate the furnace body, and in the furnace chamber 12, a plurality of metal or ceramic materials for carrying the sintered object from the inlet 12a to the outlet 12b are placed and conveyed. A roller 13 is provided. The continuous sintering furnace 10 using such a roller type conveying mechanism is sometimes called a roller hearth furnace. The furnace chamber 12 is formed by a furnace wall 11 made of refractory bricks or the like constructed so as to surround the rollers 13 provided along the transport path of the sintered object from the top, bottom, left and right, and the rollers 13 are formed on the floor 12c of the furnace chamber 12. It is surrounded from all sides by the right side wall 12e and the left side wall 12f from the ceiling 12d and the entrance 12a toward the exit 12b.
　炉室１２には、上下に移動して焼結対象物の搬送路に沿って炉室１２を開放又は閉鎖することができる複数の可動扉１４が備えられている。このような可動扉１４によって、炉室１２は、入口１２ａから出口１２ｂに向かって、第１区画１２１、第２区画１２２、第３区画１２３及び第４区画１２４の各区画に区分けされている。可動扉１４は、各区画の温度などの雰囲気を維持するように、通常は閉鎖され、ローラー１３によって搬送される焼結対象物が通過するときに開放されるようにしてもよい。 The furnace chamber 12 is provided with a plurality of movable doors 14 that can move up and down to open or close the furnace chamber 12 along a transport path for the sintered object. Such movable door 14, furnace chamber 12 from the inlet 12a towards the outlet 12b, first section 12 1, divided into each section of the second compartment 12, second and third sections 12, third and fourth compartments 12 4 Has been done. The movable door 14 may be normally closed and opened when the sintered object conveyed by the roller 13 passes so as to maintain an atmosphere such as the temperature of each section.
　第１区画１２１、第２区画１２２、第３区画１２３及び第４区画１２４の各区画には、炉室１２を加熱するためのラジアントチューブバーナー１５が備えられている。図２は、ラジアントチューブバーナー１５の概略的な構成を示す断面図である。ラジアントチューブバーナー１５は、炭化けい素やニッケルのような耐熱材料で形成された内管１と外管２との二重管を有している。内管１には複数の通孔１ａが形成され、外管２は内管１の先端の開口と所定の間隙を設けて先端が閉じられている。 The first compartment 12 1, second compartment 12 2, each section of the third compartment 12, third and fourth sections 12 4, radiant tube burners 15 for heating the furnace chamber 12 is provided. FIG. 2 is a cross-sectional view showing a schematic configuration of the radiant tube burner 15. The radiant tube burner 15 has a double tube of an inner tube 1 and an outer tube 2 made of a heat-resistant material such as silicon carbide or nickel. A plurality of through holes 1a are formed in the inner pipe 1, and the outer pipe 2 is closed by providing a predetermined gap with the opening at the tip of the inner pipe 1.
　内管１の基部では燃料供給路５から供給された燃料ガスが管内に設けられたバーナー３から噴出され、空気供給路６から空気が供給される。燃料ガスと空気の混合気はバーナー３のスパークロッド４から発するスパークにより点火され、燃焼する炎は内管１の先端に向かって延び、内管１の先端の開口から高温の燃焼ガスが排出され、一部のガスは内管１の通孔１ａを通って排出される。内管１から排出された燃焼ガスは、先端が閉じた外管２と内管１との間隙を通り、外管２を加熱しながら外管２の先端から基部に戻る。外管２と内管１との間隙を通って基部に戻った燃焼ガスは、排気路７を通じて排出される。 At the base of the inner pipe 1, the fuel gas supplied from the fuel supply passage 5 is ejected from the burner 3 provided in the pipe, and air is supplied from the air supply passage 6. The mixture of fuel gas and air is ignited by the spark emitted from the spark rod 4 of the burner 3, the burning flame extends toward the tip of the inner pipe 1, and the high-temperature combustion gas is discharged from the opening at the tip of the inner pipe 1. , A part of the gas is discharged through the through hole 1a of the inner pipe 1. The combustion gas discharged from the inner pipe 1 passes through the gap between the outer pipe 2 having a closed tip and the inner pipe 1, and returns to the base from the tip of the outer pipe 2 while heating the outer pipe 2. The combustion gas that has returned to the base through the gap between the outer pipe 2 and the inner pipe 1 is discharged through the exhaust passage 7.
　ラジアントチューブバーナー１５においては、燃焼ガスによって加熱された外管２から周囲に放出される輻射熱が加熱に利用される。輻射熱を放出する外管２において、内管１から排出された燃焼ガスは、外管２を先端から基部に向かって加熱しながら進んで次第に温度が低下し、外管２の先端から基部に向かって次第に温度が低下して温度勾配が生じる。したがって、ラジアントチューブバーナー１５から放出される輻射熱の熱量の分布も、先端から基部に向けて次第に低下するような勾配を有している。ラジアントチューブバーナー１５の内管１に形成された通孔１ａは、温度勾配の傾きを緩やかにする作用を有している。 In the radiant tube burner 15, the radiant heat released from the outer pipe 2 heated by the combustion gas to the surroundings is used for heating. In the outer pipe 2 that emits radiant heat, the combustion gas discharged from the inner pipe 1 progresses while heating the outer pipe 2 from the tip toward the base, and the temperature gradually decreases, and the temperature gradually decreases toward the base from the tip of the outer pipe 2. The temperature gradually decreases and a temperature gradient occurs. Therefore, the distribution of the amount of radiant heat emitted from the radiant tube burner 15 also has a gradient that gradually decreases from the tip to the base. The through hole 1a formed in the inner tube 1 of the radiant tube burner 15 has an effect of gentlening the inclination of the temperature gradient.
　ラジアントチューブバーナー１５は、焼結炉１０の炉壁１１に形成された孔を通じて焼結炉１０の外部から内管１及び外管２の二重管が炉室１２に差し込まれて露出し、輻射熱を放出する外管２が炉室１２内に設けられたローラー１３による焼結対象物の搬送路の直下又は直上を横切って延びるように設置される。ラジアントチューブバーナー１５への燃料供給路５を通じた燃料ガスの供給、空気供給路６を通じた空気の供給は、図示しない電磁弁によって制御され、バーナー３の燃焼の強弱の程度や点火及び消火が制御される。 In the radiant tube burner 15, the double pipes of the inner pipe 1 and the outer pipe 2 are inserted into the furnace chamber 12 from the outside of the sintering furnace 10 through the holes formed in the furnace wall 11 of the sintering furnace 10 to be exposed, and the radiant heat is radiated. The outer pipe 2 for discharging the above material is installed so as to extend directly below or directly above the transport path of the object to be sintered by the roller 13 provided in the furnace chamber 12. The supply of fuel gas to the radiant tube burner 15 through the fuel supply path 5 and the supply of air through the air supply path 6 are controlled by a solenoid valve (not shown), and the degree of combustion intensity of the burner 3 and ignition and fire extinguishing are controlled. Will be done.
　図１に示すように、炉室１２の第１区画１２１、第２区画１２２及び第３区画１２３には、ローラー１３による焼結対象物の搬送路を上下から挟むように、炉室１２の床１２ｃ及び天井１２ｄに沿ってラジアントチューブバーナー１５が配置されている。また、第４区画１２４には、炉室１２の床１２ｃに沿ってラジアントチューブバーナー１５が配置されている。これらのラジアントチューブバーナー１５は、ラジアントチューブバーナー１５の基部から先端に向かう長手方向について、その長手方向が、ローラー１３によって焼結対象物が搬送される搬送路の方向に直交する方向になるように配置されている。搬送路が略水平面内にあるときは、長手方向は略水平面内にあってもよい。 As shown in FIG. 1, the first partition 12 1 of the furnace chamber 12, the second compartment 12, second and third sections 12 3, so as to sandwich the conveyance path of the sintered object by roller 13 from above and below, the furnace chamber Radiant tube burners 15 are arranged along the floor 12c and the ceiling 12d of the twelve. Further, in the fourth compartment 12 4, radiant tube burner 15 along the floor 12c of the furnace chamber 12 is arranged. In these radiant tube burners 15, the longitudinal direction from the base to the tip of the radiant tube burner 15 is such that the longitudinal direction is orthogonal to the direction of the transport path in which the sintered object is conveyed by the roller 13. Have been placed. When the transport path is in a substantially horizontal plane, the longitudinal direction may be in a substantially horizontal plane.
　炉室１２においては、ラジアントチューブバーナー１５の基部から先端に延びる向きについて、炉室１２の右側壁１２ｅに設置されて先端が左側壁１２ｆに対向する左向きのラジアントチューブバーナー１５と、炉室１２の左側壁１２ｆに設置されて先端が右側壁１２ｅに向かう右向きのラジアントチューブバーナー１５とが存在する。炉室１２の床１２ｃに沿って配置されたラジアントチューブバーナー１５は、隣接するラジアントチューブバーナー１５と右向きと左向きとの向きが逆になるように、炉室１２の入口１２ａから出口１２ｂに向かって焼結対象物が搬送される搬送路に沿って右向きと左向きとのラジアントチューブバーナー１５が交互に並行して配置されている。ここで、並行する配置とは、所定距離を挟んだ略平行な配置であってもよく、逆向きの並行する配置は反平行と称してもよい。同様に、炉室１２の天井１２ｄに沿って配置されたラジアントチューブバーナー１５は、隣接するラジアントチューブバーナー１５と右向きと左向きとの向きが逆になるように、炉室１２の入口１２ａから出口１２ｂに向かって焼結対象物が搬送される搬送路に沿って右向きと左向きとのラジアントチューブバーナー１５が交互に並行して配置されている。 In the furnace chamber 12, in the direction extending from the base of the radiant tube burner 15 to the tip, the left-facing radiant tube burner 15 installed on the right side wall 12e of the furnace chamber 12 and the tip facing the left side wall 12f, and the furnace chamber 12 There is a right-facing radiant tube burner 15 installed on the left side wall 12f and whose tip faces the right wall 12e. The radiant tube burner 15 arranged along the floor 12c of the furnace chamber 12 is directed from the inlet 12a of the furnace chamber 12 toward the outlet 12b so that the directions of the radiant tube burner 15 and the adjacent radiant tube burner 15 are opposite to each other in the right direction and the left direction. Radiant tube burners 15 facing right and facing left are alternately arranged in parallel along a transport path through which the object to be sintered is transported. Here, the parallel arrangement may be a substantially parallel arrangement with a predetermined distance between them, and the parallel arrangement in the opposite direction may be referred to as antiparallel. Similarly, the radiant tube burner 15 arranged along the ceiling 12d of the furnace chamber 12 has an inlet 12a to an outlet 12b of the furnace chamber 12 so that the directions of the radiant tube burner 15 and the adjacent radiant tube burner 15 are opposite to each other in the right direction and the left direction. Radiant tube burners 15 facing right and facing left are alternately arranged in parallel along a transport path in which the object to be sintered is conveyed toward.
　炉室１２の第１区画１２１、第２区画１２２及び第３区画１２３においては、炉室１２の床１２ｃ及び天井１２ｄに沿って配置されたラジアントチューブバーナー１５は、少なくとも一部が焼結対象物の搬送される搬送路の方向に沿って略等間隔で配置されている。また、炉室１２の第１区画１２１、第２区画１２２及び第３区画１２３においては、ラジアントチューブバーナー１５は、ローラー１３による焼結対象物の搬送路を挟んで炉室１２の床１２ｃ及び天井１２ｄの対向する位置に右向きと左向きとの向きが互いに逆になるように並行して配置されている。したがって、炉室１２の第１区画１２１、第２区画１２２及び第３区画１２３に各区画においては、右向きに配置されたラジアントチューブバーナー１５と左向きに配置されたラジアントチューブバーナー１５との数は等しい。 The first compartment 12 1 of the furnace chamber 12, in the second compartment 12, second and third sections 12 3, radiant tube burners 15 arranged along the floor 12c and the ceiling 12d of the furnace chamber 12 is at least partially baked It is arranged at approximately equal intervals along the direction of the transport path for transporting the object to be connected. The first compartment 12 1 of the furnace chamber 12, in the second compartment 12, second and third sections 12 3, radiant tube burners 15, sandwiched therebetween in the furnace chamber 12 bed conveyance path of the sintered object by roller 13 They are arranged in parallel at opposite positions of the 12c and the ceiling 12d so that the directions of the right direction and the left direction are opposite to each other. Thus, first section 12 1 of the furnace chamber 12, in each compartment to the second compartment 12, second and third sections 12 3, the radiant tube burner 15 located in the radiant tube burner 15 and left disposed rightward The numbers are equal.
　このように、第１区画１２１、第２区画１２２、第３区画１２３及び第４区画１２４に配置されたラジアントチューブバーナー１５によって、焼結対象物の金属粉末成形品が適切に焼結されるように、各区画は適切な均一な温度に維持される。例えば、第１区画１２１は金属粉末成形品に含まれる樹脂を除去する脱脂帯として略８００℃に維持され、第２区画１２２は予熱帯として略９５０℃に維持され、第３区画１２３は焼結帯として略１１５０℃に維持され、第４区画１２４は徐冷帯として略６５０℃に維持されてもよい。 Thus, first section 12 1, a second compartment 12, second and third sections 12, third and fourth by radiant tube burner 15 located in compartment 12 4, sintered metal objects powder molded product is baked appropriately Each compartment is maintained at a suitable uniform temperature so that it is tied. For example, the first compartment 12 1 is maintained at about 800 ° C. as a degreasing zone for removing the resin contained in the metal powder molded product, the second compartment 12 2 is maintained at about 950 ° C. as a pretropical zone, and the third compartment 12 3 is maintained. is maintained substantially 1150 ° C. as the sintering zone, the fourth compartment 12 4 may be maintained in a substantially 650 ° C. as slow cooling zone.
　本実施の形態では、ラジアントチューブバーナー１５が基部から先端に延びる向きについて、隣接するラジアントチューブバーナー１５の向きが逆になるように並行して配置されている。したがって、先端から基部に向けて次第に温度が低下し、輻射熱の熱量の分布も先端から基部に向けて次第に低下するラジアントチューブバーナー１５について、隣接するラジアントチューブバーナー１５の一対が互いに補償し、一対のラジアントチューブバーナー１５についてはその長手方向に略均一な熱量の分布で輻射熱を放出することができる。 In the present embodiment, the radiant tube burners 15 are arranged in parallel so that the directions of the adjacent radiant tube burners 15 are reversed with respect to the direction in which the radiant tube burners 15 extend from the base to the tip. Therefore, with respect to the radiant tube burner 15 in which the temperature gradually decreases from the tip to the base and the distribution of the amount of heat of radiant heat also gradually decreases from the tip to the base, the pair of adjacent radiant tube burners 15 compensate each other, and the pair The radiant tube burner 15 can emit radiant heat with a substantially uniform distribution of heat in the longitudinal direction.
　詳しくは、ラジアントチューブバーナー１５が炉室１２の床１２ｃ又は天井１２ｄに沿って、炉室１２の入口１２ａから出口１２ｂに向かって焼結対象物が搬送される搬送路に沿って右向きと左向きとのラジアントチューブバーナー１５が交互に並行して配置されている。したがって、隣接するラジアントチューブバーナー１５の一対が互いに補償し、炉室１２が幅方向に均一な温度に保たれている。したがって、ローラー１３に載置された焼結対象物がローラー１３の中央から炉室１２の右側壁１２ｅ又は左側壁１２ｆのいずれの側に位置が偏っても、均一に焼結されることが保証される。 Specifically, the radiant tube burner 15 faces right and left along the transport path in which the sintered object is conveyed from the inlet 12a to the outlet 12b of the furnace chamber 12 along the floor 12c or the ceiling 12d of the furnace chamber 12. Radiant tube burners 15 are arranged in parallel alternately. Therefore, a pair of adjacent radiant tube burners 15 compensate each other, and the furnace chamber 12 is maintained at a uniform temperature in the width direction. Therefore, it is guaranteed that the object to be sintered placed on the roller 13 is uniformly sintered even if the position is deviated from the center of the roller 13 to either the right side wall 12e or the left side wall 12f of the furnace chamber 12. Will be done.
　また、ラジアントチューブバーナー１５には、ローラー１３を挟んで炉室１２の床１２ｃ及び天井１２ｄの対向する位置に右向きと左向きが互いに逆になるように並行して配置されているものがある。このように配置されたラジアントチューブバーナー１５によって、対向するラジアントチューブバーナー１５の一対が互いに補償し、炉室１２が高さ方向に均一な温度に保たれている。したがって、ローラー１３に載置された焼結対象物の高さが大きく、焼結対象物がローラー１３の載置面から高さ方向に延びても均一に焼結されることが保証される。 Further, some radiant tube burners 15 are arranged in parallel so that the right direction and the left direction are opposite to each other at the positions facing the floor 12c and the ceiling 12d of the furnace chamber 12 with the roller 13 interposed therebetween. By the radiant tube burners 15 arranged in this way, the pair of the radiant tube burners 15 facing each other compensate each other, and the furnace chamber 12 is maintained at a uniform temperature in the height direction. Therefore, the height of the object to be sintered placed on the roller 13 is large, and it is guaranteed that the object to be sintered is uniformly sintered even if the object to be sintered extends from the mounting surface of the roller 13 in the height direction.
　（第２の実施の形態）
　図３及び図４は、メッシュベルト式搬送機構を用いた連続式の焼結炉２０を示す図である。図３（ａ）は焼結炉２０の略水平に延びる切断面による断面図であり、図３（ｂ）は図３（ａ）におけるＩＩＩ（ｂ）－ＩＩＩ（ｂ）で示された略鉛直に延びる切断面による断面図であり、図４は図３（ａ）におけるＩＶ－ＩＶで示された略鉛直に伸びる切断面による断面図である。図３（ｂ）には、図３（ａ）の断面図の切断面がＩＩＩ（ａ）－ＩＩＩ（ａ）により示されている。 (Second Embodiment)
3 and 4 are views showing a continuous sintering furnace 20 using a mesh belt type transfer mechanism. FIG. 3 (a) is a cross-sectional view of the sintering furnace 20 with a substantially horizontally extending cut surface, and FIG. 3 (b) is a substantially vertical view shown by III (b) -III (b) in FIG. 3 (a). FIG. 4 is a cross-sectional view taken along the cut surface extending substantially vertically shown by IV-IV in FIG. 3 (a). In FIG. 3 (b), the cut surface of the cross-sectional view of FIG. 3 (a) is shown by III (a) -III (a).
　焼結炉２０には、炉体を貫通するように炉室２２が形成され、炉室２２には入口２２ａから出口２２ｂまで焼結対象物を載置して搬送するメッシュベルト２３が設けられている。また、メッシュベルト２３によって搬送される焼結対象物の搬送路を覆うように、メッシュベルト２３を取り囲んで金属又はセラミック製のマッフル２７がトンネル状に形成され、メッシュベルト２３による焼結対象物の搬送路はマッフル２７内を延びている。炉室２２は、焼結対象物の搬送路を覆って延びるマッフル２７を上下左右から取り囲むように築かれた耐火煉瓦等による炉壁２１によって形成されている。マッフル２７は、炉室２２の床２２ｃ、天井２２ｄ、入口２２ａから出口２２ｂに向かって右側壁２２ｅ及び左側壁２２ｆによって四方から取り囲まれ、さらに入口２２ａの入口側壁２２ｇ及び出口２２ｂの出口側壁２２ｈによっても取り囲まれている。炉室２２の床２２ｃには、焼結対象物の搬送路に沿って所定間隔で所定高さの支持壁２６が形成され、マッフル２７の底部を支持している。 In the sintering furnace 20, a furnace chamber 22 is formed so as to penetrate the furnace body, and the furnace chamber 22 is provided with a mesh belt 23 on which an object to be sintered is placed and conveyed from the inlet 22a to the outlet 22b. There is. Further, a metal or ceramic muffle 27 is formed in a tunnel shape surrounding the mesh belt 23 so as to cover the transport path of the sintered object conveyed by the mesh belt 23, and the sintered object by the mesh belt 23 is formed. The transport path extends within the muffle 27. The furnace chamber 22 is formed by a furnace wall 21 made of refractory bricks or the like constructed so as to surround the muffle 27 extending from above, below, left and right so as to cover the transport path of the sintered object. The muffle 27 is surrounded from all sides by the floor 22c of the furnace chamber 22, the ceiling 22d, the right side wall 22e and the left side wall 22f from the inlet 22a toward the outlet 22b, and further by the inlet side wall 22g of the inlet 22a and the outlet side wall 22h of the outlet 22b. Is also surrounded. On the floor 22c of the furnace chamber 22, support walls 26 having a predetermined height are formed at predetermined intervals along the transport path of the sintered object to support the bottom of the muffle 27.
　マッフル２７は、メッシュベルト２３によって焼結対象物が搬送されるマッフル２７内の搬送路の雰囲気を炉室２２の雰囲気から隔離している。マッフル２７内の雰囲気は、焼結対象物に適した所望の雰囲気に設定することができる。マッフル２７内でメッシュベルト２３に載置されて搬送される焼結対象物は、マッフル２７の壁面から照射される輻射熱によって加熱される。 The muffle 27 isolates the atmosphere of the transport path in the muffle 27 to which the object to be sintered is transported by the mesh belt 23 from the atmosphere of the furnace chamber 22. The atmosphere in the muffle 27 can be set to a desired atmosphere suitable for the object to be sintered. The sintered object placed on the mesh belt 23 in the muffle 27 and conveyed is heated by the radiant heat emitted from the wall surface of the muffle 27.
　炉室２２には、ラジアントチューブバーナー２５が備えられている。ラジアントチューブバーナー２５は、図２に示した第１の実施の形態のラジアントチューブバーナー１５と同様の構成を有している。ラジアントチューブバーナー２５は、内管と外管との二重管を有し、燃焼する炎は内管の先端に向かって延び、内管の先端の開口から高温の燃焼ガスが排出され、一部のガスは内管の通孔を通って排出される。内管から排出された燃焼ガスは、先端が閉じた外管と内管との間隙を通り、外管を加熱しながら外管の先端から基部に戻り、先端から基部に向かって次第に温度が低下して温度勾配が生じる。したがって、ラジアントチューブバーナー２５から放出される輻射熱の熱量の分布も、先端から基部に向けて次第に低下するような勾配を有している。 The furnace chamber 22 is provided with a radiant tube burner 25. The radiant tube burner 25 has the same configuration as the radiant tube burner 15 of the first embodiment shown in FIG. The radiant tube burner 25 has a double pipe of an inner pipe and an outer pipe, and the burning flame extends toward the tip of the inner pipe, and high-temperature combustion gas is discharged from the opening at the tip of the inner pipe, and a part thereof Gas is discharged through the through hole of the inner pipe. The combustion gas discharged from the inner pipe passes through the gap between the outer pipe and the inner pipe whose tip is closed, returns to the base from the tip of the outer pipe while heating the outer pipe, and the temperature gradually decreases from the tip to the base. Then a temperature gradient is generated. Therefore, the distribution of the amount of radiant heat emitted from the radiant tube burner 25 also has a gradient that gradually decreases from the tip to the base.
　ラジアントチューブバーナー２５は、焼結炉２０の炉壁２１に形成された孔を通じて焼結炉２０の外部から炉室２２に差し込まれて露出し、炉室２２内のマッフル２７の直下又は直上を横切って延びるように設置される。ラジアントチューブバーナー２５への燃料ガスの供給、空気の供給は、図示しない電磁弁によって制御され、ラジアントチューブバーナー２５の燃焼の強弱の程度や点火及び消火が制御される。 The radiant tube burner 25 is inserted into the furnace chamber 22 from the outside of the sintering furnace 20 through a hole formed in the furnace wall 21 of the sintering furnace 20 to be exposed, and crosses directly below or directly above the muffle 27 in the furnace chamber 22. It is installed so as to extend. The supply of fuel gas and the supply of air to the radiant tube burner 25 are controlled by an electromagnetic valve (not shown), and the degree of combustion intensity, ignition and fire extinguishing of the radiant tube burner 25 are controlled.
　図３（ｂ）及び図４に示すように、炉室２２には、マッフル２７を上下から挟むように、炉室２２の床２２ｃ及び天井２２ｄに沿ってラジアントチューブバーナー２５が配置されている。これらのラジアントチューブバーナー２５は、ラジアントチューブバーナー２５の基部から先端に向かう長手方向について、その長手方向が、マッフル２７内でメッシュベルト２３によって焼結対象物が搬送される搬送路の方向に直交する方向になるように配置されている。搬送路が略水平面内にあるときは、長手方向は略水平面内にあってもよい。 As shown in FIGS. 3B and 4, in the furnace chamber 22, a radiant tube burner 25 is arranged along the floor 22c and the ceiling 22d of the furnace chamber 22 so as to sandwich the muffle 27 from above and below. The longitudinal direction of these radiant tube burners 25 from the base to the tip of the radiant tube burner 25 is orthogonal to the direction of the transport path in which the object to be sintered is transported by the mesh belt 23 in the muffle 27. It is arranged so that it faces the direction. When the transport path is in a substantially horizontal plane, the longitudinal direction may be in a substantially horizontal plane.
　炉室２２においては、ラジアントチューブバーナー２５の基部から先端に延びる向きについて、炉室２２の右側壁２２ｅに設置されて先端が左側壁２２ｆに対向する左向きのラジアントチューブバーナー２５と、炉室２２の左側壁２２ｆに設置されて先端が右側壁２２ｅに向かう右向きのラジアントチューブバーナー２５とが存在する。炉室２２の床２２ｃに沿って配置されたラジアントチューブバーナー２５は、隣接するラジアントチューブバーナー２５と右向きと左向きとの向きが逆になるように、炉室２２の入口２２ａから出口２２ｂに向かってマッフル２７内で焼結対象物が搬送される搬送路に沿って右向きと左向きとのラジアントチューブバーナー２５が交互に並行して配置されている。ここで、並行する配置とは、所定距離を挟んだ略平行な配置であってもよく、逆向きの並行する配置は反平行と称してもよい。同様に、炉室２２の天井２２ｄに沿って配置されたラジアントチューブバーナー２５は、隣接するラジアントチューブバーナー２５と右向きと左向きとの向きが逆になるように、炉室２２の入口２２ａから出口２２ｂに向かってマッフル２７内で焼結対象物が搬送される搬送路に沿って右向きと左向きとのラジアントチューブバーナー２５が交互に並行して配置されている。 In the furnace chamber 22, the direction of extending from the base of the radiant tube burner 25 to the tip is the left-facing radiant tube burner 25 installed on the right side wall 22e of the furnace chamber 22 and the tip facing the left side wall 22f, and the furnace chamber 22. There is a radiant tube burner 25 that is installed on the left side wall 22f and whose tip faces the right side wall 22e and faces to the right. The radiant tube burner 25 arranged along the floor 22c of the furnace chamber 22 is directed from the inlet 22a of the furnace chamber 22 toward the outlet 22b so that the direction of the adjacent radiant tube burner 25 is opposite to that of the adjacent radiant tube burner 25 in the right direction and the left direction. Right-facing and left-facing radiant tube burners 25 are alternately arranged in parallel in the muffle 27 along a transport path through which the sintered object is transported. Here, the parallel arrangement may be a substantially parallel arrangement with a predetermined distance between them, and the parallel arrangement in the opposite direction may be referred to as antiparallel. Similarly, the radiant tube burner 25 arranged along the ceiling 22d of the furnace chamber 22 has an inlet 22a to an outlet 22b of the furnace chamber 22 so that the directions of the radiant tube burner 25 and the adjacent radiant tube burner 25 are opposite to each other in the right direction and the left direction. Radiant tube burners 25 facing right and facing left are alternately arranged in parallel along the transport path in which the object to be sintered is transported in the muffle 27.
　炉室２２においては、炉室２２の床２２ｃ及び天井２２ｄに沿って配置されたラジアントチューブバーナー２５は、マッフル２７内で焼結対象物の搬送される搬送路の方向に沿って略等間隔で配置されている。また、炉室２２においては、ラジアントチューブバーナー２５は、焼結対象物の搬送路を覆うマッフル２７を挟んで炉室２２の床２２ｃ及び天井２２ｄの対向する位置に右向きと左向きとの向きが互いに逆になるように並行して配置されている。したがって、炉室２２においては、右向きに配置されたラジアントチューブバーナー２５と左向きに配置されたラジアントチューブバーナー２５との数は等しい。 In the furnace chamber 22, the radiant tube burners 25 arranged along the floor 22c and the ceiling 22d of the furnace chamber 22 are arranged at substantially equal intervals along the direction of the transport path in which the sintered object is conveyed in the muffle 27. Have been placed. Further, in the furnace chamber 22, the radiant tube burner 25 faces right and left at opposite positions of the floor 22c and the ceiling 22d of the furnace chamber 22 with the muffle 27 covering the conveying path of the sintered object interposed therebetween. They are arranged in parallel so that they are reversed. Therefore, in the furnace chamber 22, the number of the radiant tube burners 25 arranged to the right and the number of the radiant tube burners 25 arranged to the left are equal.
　このように、炉室２２に配置されたラジアントチューブバーナー２５によって、焼結対象物の金属粉末成形品が適切に焼結されるように、炉室２２は適切な均一な温度に維持される。また、炉室２２において焼結対象物がメッシュベルト２３に載置されて搬送される搬送路はトンネル状のマッフル２７によって覆われている。マッフル２７内の雰囲気は、焼結対象物の金属粉末成形品に適した雰囲気に設定することができる。 In this way, the furnace chamber 22 is maintained at an appropriate uniform temperature so that the metal powder molded product of the object to be sintered is appropriately sintered by the radiant tube burner 25 arranged in the furnace chamber 22. Further, in the furnace chamber 22, the transport path in which the object to be sintered is placed on the mesh belt 23 and transported is covered with a tunnel-shaped muffle 27. The atmosphere inside the muffle 27 can be set to an atmosphere suitable for the metal powder molded product of the sintered object.
　本実施の形態では、ラジアントチューブバーナー２５が基部から先端に延びる向きについて、隣接するラジアントチューブバーナー２５の向きが逆になるように並行して配置されている。したがって、先端から基部に向けて次第に温度が低下し、輻射熱の熱量の分布も先端から基部に向けて次第に低下するラジアントチューブバーナー２５について、隣接するラジアントチューブバーナー２５の一対が互いに補償し、一対のラジアントチューブバーナー２５についてはその長手方向に略均一な熱量の分布で輻射熱を放出することができる。 In the present embodiment, the radiant tube burners 25 are arranged in parallel so that the directions of the adjacent radiant tube burners 25 are reversed with respect to the direction in which the radiant tube burners 25 extend from the base to the tip. Therefore, with respect to the radiant tube burner 25 in which the temperature gradually decreases from the tip to the base and the distribution of the amount of heat of radiant heat also gradually decreases from the tip to the base, the pair of adjacent radiant tube burners 25 compensate each other and the pair The radiant tube burner 25 can emit radiant heat with a substantially uniform distribution of heat in the longitudinal direction.
　詳しくは、ラジアントチューブバーナー２５が炉室２２の床２２ｃ又は天井２２ｄに沿って、炉室２２の入口２２ａから出口２２ｂに向かってマッフル２７内で焼結対象物が搬送される搬送路に沿って右向きと左向きとのラジアントチューブバーナー２５が交互に並行して配置されている。したがって、隣接するラジアントチューブバーナー２５の一対が互いに補償し、炉室２２が幅方向に均一な温度に保たれてマッフル２７の壁面からも幅方向に均一な輻射熱が照射される。したがって、メッシュベルト２３に載置されてマッフル２７を搬送される焼結対象物がメッシュベルト２３の中央から炉室２２の右側壁２２ｅ又は左側壁２２ｆのいずれの側に位置が偏っても、均一に焼結されることが保証される。 Specifically, the radiant tube burner 25 is carried along the floor 22c or the ceiling 22d of the furnace chamber 22 from the inlet 22a to the outlet 22b of the furnace chamber 22 along the transport path in which the sintered object is conveyed in the muffle 27. The right-facing and left-facing radiant tube burners 25 are alternately arranged in parallel. Therefore, the pair of adjacent radiant tube burners 25 compensate each other, the furnace chamber 22 is maintained at a uniform temperature in the width direction, and the wall surface of the muffle 27 is also irradiated with uniform radiant heat in the width direction. Therefore, even if the sintered object mounted on the mesh belt 23 and conveyed to the muffle 27 is displaced from the center of the mesh belt 23 to either the right side wall 22e or the left side wall 22f of the furnace chamber 22, it is uniform. Is guaranteed to be sintered.
　また、ラジアントチューブバーナー２５は、ローラー２３を挟んで炉室２２の床２２ｃ及び天井２２ｄの対向する位置に右向きと左向きが互いに逆になるように並行して配置されている。このように配置されたラジアントチューブバーナー２５によって、対向するラジアントチューブバーナー２５の一対が互いに補償し、炉室２２が高さ方向に均一な温度に保たれてマッフル２７の壁面からも高さ方向に均一な輻射熱が照射される。したがって、メッシュベルト２３に載置されてマッフル２７内を搬送される焼結対象物の高さが大きく、焼結対象物がメッシュベルト２３の載置面から高さ方向に延びても、均一に焼結されることが保証される。 Further, the radiant tube burner 25 is arranged in parallel at positions facing the floor 22c and the ceiling 22d of the furnace chamber 22 with the roller 23 interposed therebetween so that the right and left directions are opposite to each other. By the radiant tube burners 25 arranged in this way, the pair of radiant tube burners 25 facing each other compensate each other, the furnace chamber 22 is maintained at a uniform temperature in the height direction, and the temperature is kept uniform in the height direction from the wall surface of the muffle 27 in the height direction. Uniform radiant heat is applied. Therefore, the height of the sintered object mounted on the mesh belt 23 and conveyed in the muffle 27 is large, and even if the sintered object extends in the height direction from the mounting surface of the mesh belt 23, it is uniform. Guaranteed to be sintered.
　なお、本実施の形態においては、図３及び図４に示したように、炉室２２の入口２２ａから出口２２ｂまでメッシュベルト２３に載置して搬送する焼結対象物の搬送路はマッフル２７によって覆われていたが、このような構成に限らない。焼結炉２０の炉室２２にマッフル２７を設けず、メッシュベルト２３による焼結対象物の搬送機構が炉室２２内で露出していてもよい。このようにマッフル２７を設けない場合には、ラジアントチューブバーナー２５が焼結対象物に直接に対向するため、ラジアントチューブバーナー２５から放出された輻射熱によって焼結対象物を効率よく加熱することができる。 In the present embodiment, as shown in FIGS. 3 and 4, the transport path of the sintered object to be transported by placing it on the mesh belt 23 from the inlet 22a to the outlet 22b of the furnace chamber 22 is the muffle 27. It was covered by, but it is not limited to such a configuration. The muffle 27 may not be provided in the furnace chamber 22 of the sintering furnace 20, and the transfer mechanism of the sintered object by the mesh belt 23 may be exposed in the furnace chamber 22. When the muffle 27 is not provided in this way, the radiant tube burner 25 directly faces the object to be sintered, so that the object to be sintered can be efficiently heated by the radiant heat emitted from the radiant tube burner 25. ..
　また、本実施の形態のメッシュベルト２３による搬送機構に代えて、焼結対象物を載置したトレーをトレープッシャーによって炉室２２の入口２２ａから続けて押し込むことにより焼結対象物がマッフル２７内の搬送路に沿って搬送されるようにしたプッシュトレー式搬送機構を使用してもよい。 Further, instead of the transport mechanism by the mesh belt 23 of the present embodiment, the tray on which the object to be sintered is placed is continuously pushed from the inlet 22a of the furnace chamber 22 by the tray pusher so that the object to be sintered is inside the muffle 27. You may use a push tray type transport mechanism which is made to be transported along the transport path of the above.
　（第３の実施の形態）
　図５は、バッチ式の焼結炉３０を示す図である。図５（ａ）は焼結炉３０の略水平に延びる切断面による断面図であり、図５（ｂ）は図５（ａ）におけるＶ（ｂ）－Ｖ（ｂ）で示された略鉛直に延びる切断面による断面図である。図５（ｂ）には、図５（ａ）の断面図の切断面がＶ（ａ）－Ｖ（ａ）により示されている。 (Third Embodiment)
FIG. 5 is a diagram showing a batch type sintering furnace 30. FIG. 5 (a) is a cross-sectional view of the sintering furnace 30 with a substantially horizontally extending cut surface, and FIG. 5 (b) is a substantially vertical view shown by V (b) -V (b) in FIG. 5 (a). It is a cross-sectional view by a cut surface extending to. In FIG. 5 (b), the cut surface of the cross-sectional view of FIG. 5 (a) is shown by V (a) -V (a).
　焼結炉３０には、扉３９によって開閉可能な炉室３２が形成されている。炉室３２は、耐火煉瓦等による炉壁３１によって築かれ、炉壁３１の床３２ａ、天井３２ｂ、扉３９から炉室３２の奥に向かって右側壁３２ｃ及び左側壁３２ｄ、扉３９に対向する最奥壁３２ｅによって取り囲まれている。炉室３２の床３２ａには、焼結対象物を載置するために耐火煉瓦等による台３６が設けられている。 The sintering furnace 30 is formed with a furnace chamber 32 that can be opened and closed by a door 39. The furnace chamber 32 is constructed by a furnace wall 31 made of refractory bricks or the like, and faces the right wall 32c, the left wall 32d, and the door 39 from the floor 32a, the ceiling 32b, and the door 39 of the furnace wall 31 toward the back of the furnace chamber 32. It is surrounded by the innermost wall 32e. On the floor 32a of the furnace chamber 32, a base 36 made of refractory bricks or the like is provided for placing an object to be sintered.
　炉室３２には、炉室３２を加熱するためのラジアントチューブバーナー３５が備えられている。ラジアントチューブバーナー３５は、図２に示した第１の実施の形態のラジアントチューブバーナー１５と同様の構成を有している。ラジアントチューブバーナー３５は、内管と外管との二重管を有し、燃焼する炎は内管の先端に向かって延び、内管の先端の開口から高温の燃焼ガスが排出され、一部のガスは内管の通孔を通って排出される。内管から排出された燃焼ガスは、先端が閉じた外管と内管との間隙を通り、外管を加熱しながら外管の先端から基部に戻り、先端から基部に向かって次第に温度が低下して温度勾配が生じる。したがって、ラジアントチューブバーナー３５から放出される輻射熱の熱量の分布も、先端から基部に向けて次第に低下するような勾配を有している。 The furnace chamber 32 is provided with a radiant tube burner 35 for heating the furnace chamber 32. The radiant tube burner 35 has the same configuration as the radiant tube burner 15 of the first embodiment shown in FIG. The radiant tube burner 35 has a double pipe of an inner pipe and an outer pipe, and the burning flame extends toward the tip of the inner pipe, and high-temperature combustion gas is discharged from the opening at the tip of the inner pipe, and a part thereof. Gas is discharged through the through hole of the inner pipe. The combustion gas discharged from the inner pipe passes through the gap between the outer pipe and the inner pipe whose tip is closed, returns to the base from the tip of the outer pipe while heating the outer pipe, and the temperature gradually decreases from the tip to the base. Then a temperature gradient is generated. Therefore, the distribution of the amount of radiant heat emitted from the radiant tube burner 35 also has a gradient that gradually decreases from the tip to the base.
　ラジアントチューブバーナー３５は、炉室３２の右側壁３２ｃ及び左側壁３２ｄに沿って配置されている。ラジアントチューブバーナー３５は、ラジアントチューブバーナー３５の基部から先端に向かう方向を長手方向について、その長手方向が、扉３９から炉室３２の奥に向かう方向に直交する方向になるように配置されている。この方向が略水平面内にあるときには、ラジアントチューブバーナー３５の長手方向は、略鉛直方向にあってもよい。 The radiant tube burner 35 is arranged along the right side wall 32c and the left side wall 32d of the furnace chamber 32. The radiant tube burner 35 is arranged so that the direction from the base to the tip of the radiant tube burner 35 is the longitudinal direction, and the longitudinal direction thereof is orthogonal to the direction from the door 39 to the back of the furnace chamber 32. .. When this direction is in a substantially horizontal plane, the longitudinal direction of the radiant tube burner 35 may be a substantially vertical direction.
　炉室３２においては、ラジアントチューブバーナー３５の基部から先端に延びる向きについて、炉室３２の床３２ａに設置されて先端が天井３２ｂに対向するように略鉛直方向に上向きのラジアントチューブバーナー３５と、炉室３２の天井３２ｂに設置されて先端が床３２ａに向かう略鉛直方向に下向きのラジアントチューブバーナー３５とが存在する。炉室３２の右側壁３２ｃに沿って配置されたラジアントチューブバーナー３５は、隣接するラジアントチューブバーナー３５と上向きと下向きとの向きが逆になるように、炉室３２の扉３９から奥に向かって上向きと下向きとのラジアントチューブバーナー３５が交互に並行して配置されている。同様に、炉室３２の右側壁３２ｃに沿って配置されたラジアントチューブバーナー３５は、隣接するラジアントチューブバーナー３５と上向きと下向きとの向きが逆になるように、炉室３２の扉３９から奥に向かって上向きと下向きとのラジアントチューブバーナー３５が交互に並行して配置されている。 In the furnace chamber 32, with respect to the direction extending from the base of the radiant tube burner 35 to the tip, the radiant tube burner 35 installed on the floor 32a of the furnace chamber 32 and upward in the substantially vertical direction so that the tip faces the ceiling 32b, There is a radiant tube burner 35 which is installed on the ceiling 32b of the furnace chamber 32 and whose tip is directed downward in a substantially vertical direction toward the floor 32a. The radiant tube burner 35 arranged along the right side wall 32c of the furnace chamber 32 faces from the door 39 of the furnace chamber 32 toward the back so that the direction of the radiant tube burner 35 is opposite to that of the adjacent radiant tube burner 35. The upward and downward radiant tube burners 35 are alternately arranged in parallel. Similarly, the radiant tube burner 35 arranged along the right side wall 32c of the furnace chamber 32 is located behind the door 39 of the furnace chamber 32 so that the direction of the radiant tube burner 35 is opposite to that of the adjacent radiant tube burner 35. Radiant tube burners 35 facing upward and downward are alternately arranged in parallel.
　炉室３２の右側壁３２ｃ及び左側壁３２ｄに沿って配置されたラジアントチューブバーナー３５は、炉室３２の扉３９から奥に向かって略等間隔で配置されている。また、炉室３２おいては、ラジアントチューブバーナー３５は、炉室３２の右側壁３２ｃ及び左側壁３２ｄの対向する位置に上向きと下向きとの向きが互いに逆になるように並行して配置されている。したがって、炉室３２においては、上向きに配置されたラジアントチューブバーナー３５と下向きに配置されたラジアントチューブバーナー３５との数は等しい。 The radiant tube burners 35 arranged along the right side wall 32c and the left side wall 32d of the furnace chamber 32 are arranged at substantially equal intervals from the door 39 of the furnace chamber 32 toward the back. Further, in the furnace chamber 32, the radiant tube burner 35 is arranged in parallel at positions facing the right side wall 32c and the left side wall 32d of the furnace chamber 32 so that the upward and downward directions are opposite to each other. There is. Therefore, in the furnace chamber 32, the numbers of the radiant tube burners 35 arranged upward and the radiant tube burners 35 arranged downward are equal.
　このように配置されたラジアントチューブバーナー３５によって、焼結対象物の金属粉末成形品が適切に焼結されるように、炉室３２は適切な均一な温度に維持される。例えば、第１工程の金属粉末成形品に含まれる樹脂を除去する脱脂工程として略８００℃に維持し、第２工程の予熱工程として略９５０℃に維持し、第３工程の焼結工程として略１１５０℃に維持し、第４工程の徐冷工程として略６５０℃に維持するように、所定時間ごとに所望の温度に維持するような複数の工程を順に実施してもよい。 The radiant tube burner 35 arranged in this way maintains the furnace chamber 32 at an appropriate uniform temperature so that the metal powder molded product of the object to be sintered is properly sintered. For example, the degreasing step of removing the resin contained in the metal powder molded product in the first step is maintained at about 800 ° C., the preheating step of the second step is maintained at about 950 ° C., and the sintering step of the third step is omitted. A plurality of steps may be sequentially carried out so as to maintain the temperature at 1150 ° C. and maintain the temperature at a desired temperature at predetermined time intervals so as to maintain the temperature at about 650 ° C. as the slow cooling step of the fourth step.
　本実施の形態では、ラジアントチューブバーナー３５が基部から先端に延びる向きについて、隣接するラジアントチューブバーナー３５の向きが逆になるように並行して配置されている。したがって、先端から基部に向けて次第に温度が低下し、輻射熱の熱量の分布も先端から基部に向けて次第に低下するラジアントチューブバーナー３５について、隣接するラジアントチューブバーナー３５の一対が互いに補償し、一対のラジアントチューブバーナー３５についてはその長手方向に略均一な熱量の分布で輻射熱を放出することができる。 In the present embodiment, the radiant tube burners 35 are arranged in parallel so that the directions of the adjacent radiant tube burners 35 are reversed with respect to the direction in which the radiant tube burners 35 extend from the base to the tip. Therefore, for the radiant tube burner 35 in which the temperature gradually decreases from the tip to the base and the distribution of the amount of heat of radiant heat also gradually decreases from the tip to the base, the pair of adjacent radiant tube burners 35 compensate each other and the pair. The radiant tube burner 35 can emit radiant heat with a substantially uniform distribution of heat in the longitudinal direction.
　詳しくは、ラジアントチューブバーナー３５が炉室３２の右側壁３２ｃ又は左側壁３２ｄに沿って、炉室３２の扉３９から奥に向かって上向きと下向きとのラジアントチューブバーナー３５が交互に並行して配置されている。したがって、隣接するラジアントチューブバーナー３５の一対が互いに補償し、台３６に載置された焼結対象物が炉室３２の扉３９から奥に向かう方向に位置が移動しても炉室３２がこの方向に均一な温度に保たれているために均一に焼結されることが保証される。 Specifically, the radiant tube burner 35 is arranged along the right side wall 32c or the left side wall 32d of the furnace chamber 32, and the radiant tube burners 35 facing upward and downward are alternately arranged in parallel from the door 39 of the furnace chamber 32 toward the back. Has been done. Therefore, even if a pair of adjacent radiant tube burners 35 compensate each other and the position of the sintered object placed on the table 36 moves toward the back from the door 39 of the furnace chamber 32, the furnace chamber 32 remains in this position. It is guaranteed to be uniformly sintered because it is kept at a uniform temperature in the direction.
　また、ラジアントチューブバーナー３５は、炉室３２の右側壁３２ｃ及び左側壁３２ｄの対向する位置に上向きと下向きが互いに逆になるように並行して配置されている。このような配置されたラジアントチューブバーナー３５によって、対向するラジアントチューブバーナー３５の一対が互いに補償し、台３６に載置された焼結対象物が炉室３２の右側壁３２ｃと左側壁３２ｄの間で位置が移動しても炉室３２がこの方向に均一な温度に保たれているために均一に焼結されることが保証される。 Further, the radiant tube burner 35 is arranged in parallel at positions facing the right side wall 32c and the left side wall 32d of the furnace chamber 32 so that the upward and downward directions are opposite to each other. By the radiant tube burner 35 arranged in this way, the pair of the radiant tube burners 35 facing each other compensate each other, and the sintered object placed on the table 36 is between the right side wall 32c and the left side wall 32d of the furnace chamber 32. Even if the position is moved, the furnace chamber 32 is maintained at a uniform temperature in this direction, so that it is guaranteed that the furnace chamber 32 is uniformly sintered.
　この発明は、焼結対象物の焼結、例えば粉末金属成形品の焼結に利用することができる。 The present invention can be used for sintering an object to be sintered, for example, sintering a powdered metal molded product.
　１０　焼結炉
　１１　炉壁
　１２　炉室
　１２ａ　入口
　１２ｂ　出口
　１２ｃ　床
　１２ｄ　天井
　１２ｅ　右側壁
　１２ｆ　左側壁
　１４　可動扉
　１５　ラジアントチューブバーナー 10 Sintered furnace 11 Furnace wall 12 Furnace chamber 12a Inlet 12b Exit 12c Floor 12d Ceiling 12e Right side wall 12f Left side wall 14 Movable door 15 Radiant tube burner

Claims (21)

  1. 　焼結対象物を連続式に焼結する焼結炉であって、
    　焼結炉の入口から出口まで貫通するように形成された炉室と、
    　焼結対象物を前記入口から前記出口まで前記炉室を通って搬送する搬送機構と、
    　前記搬送機構によって搬送される焼結対象物を加熱するように前記炉室に配置された複数のラジアントチューブバーナーと
    　を含み、
    　前記複数のラジアントチューブバーナーは、隣接するラジアントチューブとラジアントチューブバーナーの基部から先端に延びる向きが逆になるよう並行して配置された焼結炉。     A sintering furnace that continuously sinters objects to be sintered.
    A furnace chamber formed so as to penetrate from the inlet to the outlet of the sintering furnace,
    A transport mechanism for transporting the object to be sintered from the inlet to the outlet through the furnace chamber,
    Including a plurality of radiant tube burners arranged in the furnace chamber so as to heat the sintered object conveyed by the transfer mechanism.
    The plurality of radiant tube burners are sintering furnaces arranged in parallel so that the directions extending from the base to the tip of the adjacent radiant tube and the radiant tube burner are opposite to each other.
  2. 　前記複数のラジアントチューブバーナーは、各ラジアントチューブの基部から先端に向かう長手方向が前記焼結対象物の搬送される方向に略直交するように前記炉室に配置された請求項１に記載の焼結炉。 The firing according to claim 1, wherein the plurality of radiant tube burners are arranged in the furnace chamber so that the longitudinal direction from the base to the tip of each radiant tube is substantially orthogonal to the direction in which the sintered object is conveyed. Sintering.
  3. 　前記炉室は、床及び天井を含み、前記複数のラジアントチューブバーナーは、前記炉室の床及び天井に沿って配置された請求項１又は２に記載の焼結炉。 The sintering furnace according to claim 1 or 2, wherein the furnace chamber includes a floor and a ceiling, and the plurality of radiant tube burners are arranged along the floor and ceiling of the furnace chamber.
  4. 　前記複数のラジアントチューブバーナーは、前記搬送機構を挟んで前記炉室の床及び天井に沿った対向する位置に、当該対向するラジアントチューブの向きが逆になるように配置された請求項３に記載の焼結炉。 The third aspect of claim 3, wherein the plurality of radiant tube burners are arranged at positions facing each other along the floor and ceiling of the furnace chamber with the transport mechanism interposed therebetween so that the directions of the facing radiant tubes are reversed. Sintering furnace.
  5. 　前記搬送機構は、ローラー式搬送機構である請求項１から４のいずれか一項に記載の焼結炉。 The sintering furnace according to any one of claims 1 to 4, wherein the transfer mechanism is a roller type transfer mechanism.
  6. 　前記炉室は、前記焼結対象物を搬送する搬送機構に沿って可動扉によって区切られた複数の区画を含む請求項５に記載の焼結炉。 The sintering furnace according to claim 5, wherein the furnace chamber includes a plurality of compartments separated by a movable door along a transport mechanism for transporting the sintered object.
  7. 　各区画に配置されたラジアントチューブバーナーは、互いに逆に向いたものの数が等しい請求項６に記載の焼結炉。 The sintering furnace according to claim 6, wherein the radiant tube burners arranged in each section have the same number of burners facing in opposite directions.
  8. 　各区画に配置されたラジアントチューブバーナーは、前記炉室の床及び天井に沿って前記焼結対象物が搬送される方向に沿って略等しい間隔で配置された請求項６又は７に記載の焼結炉。 The firing according to claim 6 or 7, wherein the radiant tube burners arranged in each section are arranged at substantially equal intervals along the floor and ceiling of the furnace chamber along the direction in which the sintered object is conveyed. Sintering.
  9. 　前記搬送機構は、メッシュベルト式搬送機構である請求項１から４のいずれか一項に記載の焼結炉。 The sintering furnace according to any one of claims 1 to 4, wherein the transfer mechanism is a mesh belt type transfer mechanism.
  10. 　前記搬送機構は、プッシュトレー式搬送機構である請求項１から４のいずれか一項に記載の焼結炉。 The sintering furnace according to any one of claims 1 to 4, wherein the transfer mechanism is a push tray type transfer mechanism.
  11. 　前記搬送機構によって搬送される焼結対象物の搬送路を取り囲んで覆うように形成されたマッフルをさらに含む請求項９又は１０に記載の焼結炉。 The sintering furnace according to claim 9 or 10, further comprising a muffle formed so as to surround and cover a transport path of a sintered object transported by the transfer mechanism.
  12. 　前記炉室は、前記焼結対象物を搬送する前記搬送機構を取り囲む炉壁によって形成された請求項１から１１のいずれか一項に記載の焼結炉。 The sintering furnace according to any one of claims 1 to 11, wherein the furnace chamber is formed by a furnace wall surrounding the transport mechanism for transporting the sintered object.
  13. 　焼結対象物をバッチ式に焼結する焼結炉であって、
    　扉で開閉可能な炉室と、
    　炉室内で焼結対象物を支持する支持部材と、
    　前記支持部材によって支持された焼結対象物を加熱するように前記炉室に配置された複数のラジアントチューブバーナーと
    　を含み、前記複数のラジアントチューブバーナーは、隣接するラジアントチューブとラジアントチューブバーナーの基部から先端に延びる向きが逆になるように並行して配置された焼結炉。     A sintering furnace that batch-sinters objects to be sintered.
    A furnace room that can be opened and closed with a door,
    A support member that supports the object to be sintered in the furnace chamber,
    The plurality of radiant tube burners include a plurality of radiant tube burners arranged in the furnace chamber so as to heat the sintered object supported by the support member, and the plurality of radiant tube burners are the bases of adjacent radiant tubes and radiant tube burners. Sintering furnaces arranged in parallel so that the direction extending from the tip to the tip is reversed.
  14. 　前記複数のラジアントチューブバーナーは、各ラジアントチューブの基部から先端に向かう長手方向が前記炉室の扉から奥に向かう方向に略直交するように配置された請求項１３に記載の焼結炉。 The sintering furnace according to claim 13, wherein the plurality of radiant tube burners are arranged so that the longitudinal direction from the base to the tip of each radiant tube is substantially orthogonal to the direction from the door of the furnace chamber to the back.
  15. 　前記炉室は、側壁を含み、前記複数のラジアントチューブバーナーは、前記炉室の側壁に沿って配置された請求項１３又は１４に記載の焼結炉。 The sintering furnace according to claim 13 or 14, wherein the furnace chamber includes a side wall, and the plurality of radiant tube burners are arranged along the side wall of the furnace chamber.
  16. 　前記複数のガスラジアントチューブバーナーは、長手方向が略鉛直方向になるように前記炉室の側壁に沿って配置された請求項１５に記載の焼結炉。 The sintering furnace according to claim 15, wherein the plurality of gas radiant tube burners are arranged along the side wall of the furnace chamber so that the longitudinal direction is substantially vertical.
  17. 　前記複数のラジアントチューブバーナーは、前記支持部材を挟んで前記炉室の側壁の対向する位置に、当該対向するラジアントチューブバーナーの向きが逆になるように配置された請求項１５又は１６に記載の焼結炉。 The 15 or 16 according to claim 15, wherein the plurality of radiant tube burners are arranged at positions facing the side walls of the furnace chamber with the support member interposed therebetween so that the directions of the facing radiant tube burners are reversed. Sintering furnace.
  18. 　前記複数のラジアントチューブバーナーは、互いに逆に向いたものの数が等しい請求項１３から１７のいずれか一項に記載の焼結炉。 The sintering furnace according to any one of claims 13 to 17, wherein the plurality of radiant tube burners have the same number of burners facing in opposite directions.
  19. 　前記複数のラジアントチューブバーナーの少なくとも一部は、前記炉室の扉から奥に向かう方向に沿って略等しい間隔で配置された請求項１３から１８のいずれか一項に記載の焼結炉。 The sintering furnace according to any one of claims 13 to 18, wherein at least a part of the plurality of radiant tube burners is arranged at substantially equal intervals along the direction from the door of the furnace chamber toward the back.
  20. 　前記炉室は、前記焼結対象物を支持する前記支持部材を取り囲む炉壁によって形成された請求項１３から１９のいずれか一項に記載の焼結炉。 The sintering furnace according to any one of claims 13 to 19, wherein the furnace chamber is formed by a furnace wall surrounding the support member that supports the sintering object.
  21. 　前記複数のラジアントチューブバーナーは、基部から先端に向けて延びる内管及び先端が閉じた外管の二重管を含み、前記内管の内部で基部から先端に向けて燃焼により燃焼ガスを発生させ、前記内管の先端から排出された燃焼ガスを前記外管と前記内管との間隙を通して基部に戻すことにより前記外管を加熱して輻射熱を発生させる請求項１から２０のいずれか一項に記載の焼結炉。
          The plurality of radiant tube burners include a double pipe of an inner pipe extending from the base toward the tip and an outer pipe having a closed tip, and generate combustion gas by combustion from the base to the tip inside the inner pipe. Any one of claims 1 to 20, wherein the combustion gas discharged from the tip of the inner pipe is returned to the base through the gap between the outer pipe and the inner pipe to heat the outer pipe and generate radiant heat. The sintering furnace described in.
PCT/JP2019/050544 2019-12-24 2019-12-24 Sintering furnace WO2021130845A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023068010A1 (en) * 2021-10-18 2023-04-27 株式会社レゾナック Soft magnetic sintered member and method for manufacturing soft magnetic sintered member

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63176421A (en) * 1987-01-13 1988-07-20 Kawasaki Steel Corp Atmosphere heat treatment furnace
JPH02178503A (en) * 1988-12-28 1990-07-11 Toshiba Ceramics Co Ltd Radiant tube
JPH03134120A (en) * 1989-10-20 1991-06-07 Nisshin Steel Co Ltd Method and apparatus for bright-annealing stainless steel strip
CN101905290A (en) * 2009-06-03 2010-12-08 苏州工业园区振兴电炉有限公司 Sintering heat treatment furnace for precise casting mould shell
JP2014240720A (en) * 2013-06-12 2014-12-25 日立化成株式会社 Mesh belt furnace for sintering
JP2016113691A (en) * 2014-12-18 2016-06-23 大同特殊鋼株式会社 Continuous vacuum sintering apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4060990B2 (en) 1999-06-01 2008-03-12 株式会社Ｎｆｋホールディングス Alternating combustion type regenerative burner system and heating furnace using the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63176421A (en) * 1987-01-13 1988-07-20 Kawasaki Steel Corp Atmosphere heat treatment furnace
JPH02178503A (en) * 1988-12-28 1990-07-11 Toshiba Ceramics Co Ltd Radiant tube
JPH03134120A (en) * 1989-10-20 1991-06-07 Nisshin Steel Co Ltd Method and apparatus for bright-annealing stainless steel strip
CN101905290A (en) * 2009-06-03 2010-12-08 苏州工业园区振兴电炉有限公司 Sintering heat treatment furnace for precise casting mould shell
JP2014240720A (en) * 2013-06-12 2014-12-25 日立化成株式会社 Mesh belt furnace for sintering
JP2016113691A (en) * 2014-12-18 2016-06-23 大同特殊鋼株式会社 Continuous vacuum sintering apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023068010A1 (en) * 2021-10-18 2023-04-27 株式会社レゾナック Soft magnetic sintered member and method for manufacturing soft magnetic sintered member

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