JP4519302B2 - Sintered product manufacturing apparatus and method - Google Patents

Sintered product manufacturing apparatus and method Download PDF

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Publication number
JP4519302B2
JP4519302B2 JP2000323609A JP2000323609A JP4519302B2 JP 4519302 B2 JP4519302 B2 JP 4519302B2 JP 2000323609 A JP2000323609 A JP 2000323609A JP 2000323609 A JP2000323609 A JP 2000323609A JP 4519302 B2 JP4519302 B2 JP 4519302B2
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Japan
Prior art keywords
muffle
gas burner
disposed
dewaxing
faces
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JP2000323609A
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JP2002130954A (en
Inventor
猛義 三木
由則 小熊
博 阿部
倫彦 川村
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Koyo Thermo Systems Co Ltd
Diamet Corp
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Koyo Thermo Systems Co Ltd
Diamet Corp
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  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)
  • Powder Metallurgy (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Tunnel Furnaces (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、脱ろう部を改良した焼結炉を用いた焼結製品の製造装置、及び製造方法に関するものである。
【0002】
【従来の技術】
一般に、焼結炉にあっては、焼結室に脱ろうガスが流入すると炉を汚染するおそれがあることから、被成形品である圧粉体中の潤滑剤を焼結に先立って除去する脱ろう部を備えている。
従来、焼結炉に備えられている脱ろう部は、前述の脱ろうガスによる炉の汚染を防止する為に、圧粉体中の潤滑剤を加熱することにより燃焼又は分解させ、あるいは分解させて炉外へ排出させる構造となっている。図4はそのような従来の焼結炉の一構成例を示したものである。
同図において、焼結炉1には無端状のベルト2が設けられ、該ベルト2の駆動によって被成形品が脱ろう部3に搬入されると、脱ろう部3に配設されたガスバーナ4が、被成形品を直接加熱することにより、潤滑剤を燃焼又は分解させるようにしている。燃焼又は分解された潤滑剤は、脱ろうガスとして排気ダクト5より排気される。
また、脱ろう部3で脱ろうされた被成形品は、ベルト2によって下流側に搬送され、図示しない焼結室等を経ることにより焼結され、焼結製品となる。
【0003】
【発明が解決しようとする課題】
ところで、上記従来技術による焼結炉1の脱ろう部3は、ガスバーナ4を使用しているので、ヒータ式のものに比較して省エネ効果を得ることができるという利点がある。
しかしながら、この焼結炉1を用いた焼結製品の製造方法に於いては、ガスバーナ4により脱ろう部内の被成形品を直接加熱し被成形品中の潤滑剤を燃焼又は分解させる為、潤滑剤の燃焼又は分解に不均一が発生する恐れがあり、そのまま焼結処理されると不良品が異常発生し、歩留まりが低下するという問題があった。
【0004】
本発明は、上記従来技術の問題点に鑑みてなされたもので、被成形品に含まれる潤滑剤を略均一に燃焼又は分解させ、良質の焼結製品を得ることができるとともに、歩留まりの向上を図ることができる、焼結製品の製造装置及び製造方法を提供することを目的とする。
【0005】
【課題を解決するための手段】
上記課題を解決するために本発明においては、以下の手段を採用した。
【0006】
請求項1に記載の発明は、焼結炉に備えられた脱ろう部,予熱室,焼結室,冷却ゾーンへと順次被成形品を搬送することによって、該被成形品を焼結製品とする焼結製品の製造装置であって、前記脱ろう部は、その内部に配置されたマッフルと、このマッフル内を間接的に加熱して間接的加熱雰囲気温度とする加熱手段と、を有し、前記加熱手段は、前記マッフルの外面部に対向し、前記マッフルの一方の側面の上部に向かうように配設された一方のガスバーナと、前記一方の側面に対向する対向側面の下部に向かうように配設された他方のガスバーナとを有し、前記一方のガスバーナによる火炎流が前記側面の外側上部から前記マッフルの上方を伝って前記対向側面方向に回るようにすると共に、他方のガスバーナによる火炎流が前記対向側面の外側下部から前記マッフルの下方を伝って前記側面方向に回るように構成されており、前記間接的加熱雰囲気温度中で前記被成形品中に含まれる潤滑剤を燃焼又は分解させて除去させることを特徴とする。
また、請求項2に記載の発明は、請求項1に記載の焼結製品の製造装置であって、前記一方のガスバーナは、前記マッフルの前記一方の側面に近接するにしたがい漸次上方へ向かうように前記一方の側面に対して傾斜するように配置され、前記他方のガスバーナは、前記マッフルの前記対向側面に近接するにしたがい漸次下方へ向かうように前記対向側面に対して傾斜するように配置されていることを特徴とする。
【0007】
請求項3に記載の発明は、焼結炉に備えられた脱ろう部,予熱室,焼結室,冷却ゾーンへと順次被成形品を搬送することによって、該被成形品を焼結製品とする焼結製品の製造方法であって、前記脱ろう部は、その内部に配置されたマッフルと、このマッフル内を間接的に加熱して間接的加熱雰囲気温度とする加熱手段と、を有し、前記加熱手段は、前記マッフルの外面部に対向し、前記マッフルの一方の側面の上部に向かうように配設された一方のガスバーナと、前記一方の側面に対向する対向側面の下部に向かうように配設された他方のガスバーナとを有し、前記一方のガスバーナによる火炎流が前記側面の外側上部から前記マッフルの上方を伝って前記対向側面方向に回るようにすると共に、他方のガスバーナによる火炎流が前記対向側面の外側下部から前記マッフルの下方を伝って前記側面方向に回るように構成されており、前記間接的加熱雰囲気温度中で前記被成形品中に含まれる潤滑剤を燃焼又は分解させて除去させることを特徴とする。
更に、請求項4に記載の発明は、請求項3に記載の焼結製品の製造方法であって、前記ガスバーナは、前記マッフルの外周方向のうちのいずれか一方に沿って傾斜するように配置されていることを特徴とする。
【0008】
請求項3に記載の発明は、焼結炉に備えられた脱ろう部,予熱室,焼結室,冷却ゾーンへと順次被成形品を搬送することによって、該被成形品を焼結製品とする焼結製品の製造方法であって、前記脱ろう部は、その内部に配置されたマッフルと、このマッフル内を間接的に加熱して間接的加熱雰囲気温度とする加熱手段と、を有し、前記加熱手段は、前記マッフルの外面部に対向し、前記マッフルの一方の側面の上部に向かうように配設された一方のガスバーナと、前記一方の側面に対向する対向側面の下部に向かうように配設された他方のガスバーナとを有し、前記一方のガスバーナによる火炎流が前記側面の外側上部から前記マッフルの上方を伝って前記対向側面方向に回るようにすると共に、他方のガスバーナによる火炎流が前記対向側面の外側下部から前記マッフルの下方を伝って前記側面方向に回るように構成されており、前記間接的加熱雰囲気温度中で前記被成形品中に含まれる潤滑剤を燃焼又は分解させて除去させることを特徴とする。
更に、請求項4に記載の発明は、請求項3に記載の焼結製品の製造方法であって、前記一方のガスバーナは、前記マッフルの前記一方の側面に近接するにしたがい漸次上方へ向かうように前記一方の側面に対して傾斜するように配置され、前記他方のガスバーナは、前記マッフルの前記対向側面に近接するにしたがい漸次下方へ向かうように前記対向側面に対して傾斜するように配置されていることを特徴とする。
【0009】
また、加熱手段をガスバーナにより構成し、ガスバーナによる火炎流を脱ろう部のマッフルの外周方向に沿って移動させるようにすれば、マッフルの内部を容易に均一な間接的加熱雰囲気温度にすることができ、被成形品中における潤滑剤の燃焼又は分解を、よりむらなく均一化させることができる。
【0010】
更に、ガスバーナを、マッフルの外周方向のうちのいずれか一方に沿って傾斜するように配置すれば、火炎流をマッフルの外周方向に沿って移動させ易くできる。
【0011】
【発明の実施の形態】
以下、本発明に係る焼結製品の製造装置及び製造方法の実施の形態を、図1乃至図3に基づいて説明する。図1は、本発明に係る焼結製品の製造方法を実施するための製造装置すなわち焼結炉を示す概略図、図2は、その焼結炉における脱ろう部を示す断面説明図である。
【0012】
焼結炉(製造装置)10は、例えばマッフルタイプのメッシュベルト炉に適用したものであって、図1に示すように、被成形品が脱ろう部11に搬入されることにより、被成形品に含まれる潤滑剤が燃焼又は分解され、次いで予熱室12を通過して被成形品が所定温度に加熱され、さらに焼結室13にて焼結され、その後、焼結室13の下流側の徐冷部14を経て冷却ゾーン15を通過することにより、所定の物理的・機械的特性及び寸法精度を有する成形品が得られるようにしている。従って、被成形品はメッシュベルトにより図1において左側から右側へ搬送され、脱ろう部11,予熱室12,焼結室13,徐冷部14、冷却ゾーン15を順次経ることとなる。
【0013】
そして、脱ろう部11は、内部に設けられているマッフル(炉芯管)21を加熱し、脱ろう部内を間接的加熱雰囲気温度とすることにより、被成形品中の潤滑剤を燃焼又は分解させる加熱手段を有している。
該加熱手段としては、例えば図2に示すように、脱ろう部11において、内部に配置されたマッフル21の外面部と対向するように二個のガスバーナ22、23が設けられている。二個のバーナのうち、一方のガスバーナ22がマッフル21の一方の側面21aの上部に向かうように配置され、他方のガスバーナ23がそれと対向する側面21bの下部に向かうように配置されている。そして、これら各バーナ22,23がマッフル21の外側を加熱したとき、一方のガスバーナ22による火炎流が側面21aの外側上部から天板部21cを伝って対向側面21b方向に回るようにすると共に、他方のガスバーナ23による火炎流が対向側面21bからメッシュベルト17の下方を経て側面21a方向に回るようにし、その際、ガスバーナの火炎による排ガスは、下方から矢印aの如く下方より排気させるよう、排気手段(図示せず)によって排気している。
【0014】
従って、この加熱手段は、二個のガスバーナ22,23によりマッフル21を外側から加熱し、これらガスバーナ22、23の火炎流がマッフル21を外側から周方向に沿って移動することにより、マッフル21の内部が間接的加熱雰囲気温度(約600〜700℃)に生成され、これにより、被成形品が搬送される領域では、ほぼ均一な間接的加熱雰囲気温度となるようにしている。そのため、ガスバーナ22,23は、火炎流がマッフル21の外周方向に沿って移動するよう、マッフル21に対し、真っ直ぐに向き合うように配置されている。
これ以外として、例えば図3に示すように、ガスバーナ22、23をマッフル21の外周方向のうちのいずれか一方に沿って傾斜角度をもつように配置し、火炎流がマッフル21の外周方向に沿って移動しやすいようにしてもよく、さらには脱ろう部11の外殻とマッフル21との間の距離も適宜選定することも望ましい。
【0015】
マッフル21内で燃焼又は分解された潤滑剤は、脱ろうガスとして図示しない脱ろうガス排気手段により排気される。この脱ろうガス排気手段としては、例えば図4において示した排気ダクト5と同様のものが挙げられる。
また、脱ろう部11によって脱ろうされた被成形品は、その後下流側に搬送され、予熱室12で予熱された後に焼結室で焼結され、徐冷部14及び冷却ゾーン15で徐冷及び冷却されて室温状態とされて、焼結製品となる。
【0016】
本実施形態に係る焼結製品の製造装置及び製造方法においては、脱ろう部11内のマッフル21を加熱手段としてのガスバーナ22,23によって外側から加熱させ、これにより、マッフル21内を間接的加熱雰囲気温度とするようにしたので、従来技術のようにガスバーナによって直接被成形品中の潤滑剤を燃焼又は分解させるものと異なり、マッフル21内部の温度を均一化することができるばかりでなく、炉内の脱ろうガスのガス流を乱すことがなく、且つ予熱効果を高めることもできる。
そのため、脱ろう部11内に搬入された被成形品中の潤滑剤をほぼ一様に燃焼又は分解により除去させることが可能となり、その結果として、良質の焼結製品を得ることができるとともに、歩留まりの向上を図ることができる。
【0017】
また、ガスバーナ22、23による火炎流を、マッフル21の外周方向に沿って移動させるようにしているので、マッフル21の内部を容易に均一な間接的加熱雰囲気温度にすることができ、被成形品中における潤滑剤の燃焼又は分解を、よりむらなく均一化させることができる。
【0018】
更に、ガスバーナ22、23を、マッフル21の外周方向のうちのいずれか一方に沿って傾斜するように配置するようにすれば、火炎流をマッフル21の外周方向に沿って移動させ易くでき、より短時間で所定の間接的加熱雰囲気温度とすることができるとともに、より高い省エネ効果を得ることができる。
【0019】
【発明の効果】
以上説明したように、本発明に係る焼結製品の製造装置及び製造方法によれば、被成形品に含まれる潤滑剤を略均一に燃焼又は分解させ、良質の焼結製品を得ることができるとともに、歩留まりの向上を図ることができる、焼結製品の製造方法を提供することができる。
【図面の簡単な説明】
【図1】 本発明に係る焼結製品の製造装置の一実施形態、すなわち焼結炉の側面図である。
【図2】 図1における焼結炉の脱ろう部を示す断面図である。
【図3】 図2における脱ろう部の他の一例を示すを示す断面図である。
【図4】 従来の焼結炉における脱ろう部の一例を示す側断面図である。
【符号の説明】
10…焼結炉(製造装置)、11…脱ろう部、21…マッフル(炉芯管)、22,23…ガスバーナ(加熱手段)
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus and a method for manufacturing a sintered product using a sintering furnace having an improved dewaxing portion.
[0002]
[Prior art]
Generally, in a sintering furnace, if the dewaxing gas flows into the sintering chamber, the furnace may be contaminated, so the lubricant in the green compact that is the molded product is removed prior to sintering. It has a dewaxing section.
Conventionally, a dewaxing section provided in a sintering furnace is burned or decomposed or decomposed by heating the lubricant in the green compact to prevent the furnace from being contaminated by the dewaxing gas. It is structured to discharge outside the furnace. FIG. 4 shows an example of the configuration of such a conventional sintering furnace.
In the figure, the sintering furnace 1 is provided with an endless belt 2, and when the molded product is carried into the dewaxing section 3 by driving the belt 2, the gas burner 4 disposed in the dewaxing section 3. However, the lubricant is burned or decomposed by directly heating the article to be molded. The burned or decomposed lubricant is exhausted from the exhaust duct 5 as dewaxing gas.
Further, the molded product dewaxed by the dewaxing portion 3 is conveyed downstream by the belt 2 and is sintered by passing through a sintering chamber (not shown) to become a sintered product.
[0003]
[Problems to be solved by the invention]
By the way, since the dewaxing part 3 of the sintering furnace 1 according to the prior art uses the gas burner 4, there is an advantage that an energy saving effect can be obtained as compared with the heater type.
However, in the method of manufacturing a sintered product using the sintering furnace 1, the molded product in the dewaxed portion is directly heated by the gas burner 4 to burn or decompose the lubricant in the molded product. There is a possibility that non-uniformity may occur in the combustion or decomposition of the agent, and if the sintering process is carried out as it is, defective products will be abnormally produced, resulting in a decrease in yield.
[0004]
The present invention has been made in view of the above-mentioned problems of the prior art. The lubricant contained in the molded product can be burned or decomposed substantially uniformly to obtain a high-quality sintered product and to improve the yield. An object of the present invention is to provide a sintered product manufacturing apparatus and a manufacturing method capable of achieving the above.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following means.
[0006]
In the invention according to claim 1, the molded product is conveyed to the sintered product by sequentially transporting the molded product to the dewaxing section, preheating chamber, sintering chamber, and cooling zone provided in the sintering furnace. An apparatus for manufacturing a sintered product, wherein the dewaxing portion includes a muffle disposed therein, and heating means for indirectly heating the inside of the muffle to obtain an indirect heating atmosphere temperature. The heating means faces the outer surface of the muffle, faces one gas burner disposed toward the upper portion of one side surface of the muffle, and moves toward the lower portion of the opposite side surface facing the one side surface. The other gas burner is arranged so that the flame flow by the one gas burner travels from the outer upper part of the side surface to the upper side of the muffle in the direction of the opposite side surface, and the flame by the other gas burner. The flow is opposite It is comprised so that it may go to the said side surface direction along the said muffle from the lower part of the outer side of a surface, and the lubricant contained in the said molded article is removed by burning or decomposing | disassembling in the said indirect heating atmosphere temperature. It is characterized by that.
The invention according to claim 2 is the sintered product manufacturing apparatus according to claim 1, wherein the one gas burner gradually moves upward as it approaches the one side surface of the muffle. The other gas burner is disposed so as to be inclined with respect to the opposing side surface so as to gradually move downward as it approaches the opposing side surface of the muffle. It is characterized by.
[0007]
According to the third aspect of the present invention, the molded product is transferred to the sintered product by sequentially conveying the molded product to the dewaxing section, preheating chamber, sintering chamber, and cooling zone provided in the sintering furnace. A method for manufacturing a sintered product, wherein the dewaxing portion has a muffle disposed therein, and heating means for indirectly heating the inside of the muffle to obtain an indirect heating atmosphere temperature. The heating means faces the outer surface of the muffle, faces one gas burner disposed toward the upper portion of one side surface of the muffle, and moves toward the lower portion of the opposite side surface facing the one side surface. The other gas burner is arranged so that the flame flow by the one gas burner travels from the outer upper part of the side surface to the upper side of the muffle in the direction of the opposite side surface, and the flame by the other gas burner. The flow is opposite Are composed of outer lower surface to turn into the side direction along the lower side of the muffle, is removed by combustion or to decompose the lubricant contained in the object to be molded article in the indirect heating atmosphere temperature It is characterized by that.
Furthermore, the invention according to claim 4 is the method for manufacturing a sintered product according to claim 3 , wherein the gas burner is disposed so as to incline along one of the outer peripheral directions of the muffle. It is characterized by being.
[0008]
According to the third aspect of the present invention, the molded product is transferred to the sintered product by sequentially conveying the molded product to the dewaxing section, preheating chamber, sintering chamber, and cooling zone provided in the sintering furnace. A method for manufacturing a sintered product, wherein the dewaxing portion has a muffle disposed therein, and heating means for indirectly heating the inside of the muffle to obtain an indirect heating atmosphere temperature. The heating means faces the outer surface of the muffle, faces one gas burner disposed toward the upper portion of one side surface of the muffle, and moves toward the lower portion of the opposite side surface facing the one side surface. The other gas burner is arranged so that the flame flow by the one gas burner travels from the outer upper part of the side surface to the upper side of the muffle in the direction of the opposite side surface, and the flame by the other gas burner. The flow is opposite It is comprised so that it may go to the said side surface direction along the said muffle from the lower part of the outer side of a surface, and the lubricant contained in the said molded article is removed by burning or decomposing | disassembling in the said indirect heating atmosphere temperature. It is characterized by that.
Furthermore, the invention according to claim 4 is the method for manufacturing a sintered product according to claim 3, wherein the one gas burner gradually moves upward as it approaches the one side surface of the muffle. The other gas burner is disposed so as to be inclined with respect to the opposing side surface so as to gradually move downward as it approaches the opposing side surface of the muffle. It is characterized by.
[0009]
Further, if the heating means is constituted by a gas burner and the flame flow by the gas burner is moved along the outer periphery direction of the muffle of the dewaxing portion, the inside of the muffle can be easily brought to a uniform indirect heating atmosphere temperature. It is possible to make the combustion or decomposition of the lubricant in the molded article more uniform.
[0010]
Furthermore, if the gas burner is disposed so as to be inclined along one of the outer peripheral directions of the muffle, the flame flow can be easily moved along the outer peripheral direction of the muffle.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a sintered product manufacturing apparatus and manufacturing method according to the present invention will be described below with reference to FIGS. FIG. 1 is a schematic view showing a manufacturing apparatus, that is, a sintering furnace for carrying out a method for manufacturing a sintered product according to the present invention, and FIG. 2 is a cross-sectional explanatory view showing a dewaxing portion in the sintering furnace.
[0012]
The sintering furnace (manufacturing apparatus) 10 is applied to, for example, a muffle type mesh belt furnace, and as shown in FIG. Then, the lubricant contained in is burned or decomposed, then passed through the preheating chamber 12, the molded product is heated to a predetermined temperature, further sintered in the sintering chamber 13, and then downstream of the sintering chamber 13. By passing through the cooling zone 15 through the slow cooling section 14, a molded product having predetermined physical and mechanical characteristics and dimensional accuracy is obtained. Accordingly, the molded product is conveyed from the left side to the right side in FIG. 1 by the mesh belt, and sequentially passes through the dewaxing portion 11, the preheating chamber 12, the sintering chamber 13, the slow cooling portion 14, and the cooling zone 15.
[0013]
And the dewaxing part 11 heats the muffle (furnace core tube) 21 provided inside, and makes the inside of the dewaxing part an indirect heating atmosphere temperature, thereby burning or decomposing the lubricant in the molded product. It has a heating means.
As the heating means, for example, as shown in FIG. 2, two gas burners 22 and 23 are provided in the dewaxing portion 11 so as to face the outer surface portion of the muffle 21 disposed inside. Of the two burners, one gas burner 22 is arranged so as to go to the upper part of one side surface 21a of the muffle 21, and the other gas burner 23 is arranged so as to go to the lower part of the side surface 21b facing it. When each of the burners 22 and 23 heats the outside of the muffle 21, the flame flow caused by one gas burner 22 travels from the outer upper part of the side surface 21a through the top plate portion 21c toward the opposite side surface 21b, The flame flow caused by the other gas burner 23 is rotated from the opposite side surface 21b to the side surface 21a through the mesh belt 17 below, and the exhaust gas from the gas burner flame is exhausted from below as indicated by the arrow a from below. Exhaust by means (not shown).
[0014]
Accordingly, the heating means heats the muffle 21 from the outside by the two gas burners 22 and 23, and the flame flow of the gas burners 22 and 23 moves the muffle 21 along the circumferential direction from the outside, thereby The inside is generated at an indirect heating atmosphere temperature (about 600 to 700 ° C.), so that the indirect heating atmosphere temperature is substantially uniform in the region where the molded product is conveyed. Therefore, the gas burners 22 and 23 are disposed so as to face the muffle 21 straight so that the flame flow moves along the outer peripheral direction of the muffle 21.
Other than this, for example, as shown in FIG. 3, the gas burners 22 and 23 are arranged so as to have an inclination angle along one of the outer peripheral directions of the muffle 21, and the flame flow follows the outer peripheral direction of the muffle 21. The distance between the outer shell of the dewaxing portion 11 and the muffle 21 may be appropriately selected.
[0015]
The lubricant burned or decomposed in the muffle 21 is exhausted by a dewaxing gas exhausting means (not shown) as dewaxing gas. As this dewaxing gas exhaust means, for example, the same exhaust duct 5 as shown in FIG.
Further, the molded product dewaxed by the dewaxing section 11 is then conveyed downstream, preheated in the preheating chamber 12 and then sintered in the sintering chamber, and gradually cooled in the slow cooling section 14 and the cooling zone 15. And it is cooled to room temperature and becomes a sintered product.
[0016]
In the sintered product manufacturing apparatus and manufacturing method according to the present embodiment, the muffle 21 in the dewaxing section 11 is heated from the outside by gas burners 22 and 23 as heating means, whereby the inside of the muffle 21 is indirectly heated. Since the ambient temperature is set, the temperature inside the muffle 21 can be made uniform, unlike the case where the lubricant in the molded article is directly burned or decomposed by the gas burner as in the prior art. The gas flow of the dewaxing gas is not disturbed, and the preheating effect can be enhanced.
Therefore, it becomes possible to remove the lubricant in the molded article carried into the dewaxing portion 11 almost uniformly by combustion or decomposition, and as a result, a high-quality sintered product can be obtained, Yield can be improved.
[0017]
Further, since the flame flow by the gas burners 22 and 23 is moved along the outer peripheral direction of the muffle 21, the inside of the muffle 21 can be easily set to a uniform indirect heating atmosphere temperature, and the molded product The combustion or decomposition of the lubricant in the inside can be made more uniform.
[0018]
Furthermore, if the gas burners 22 and 23 are arranged so as to be inclined along one of the outer peripheral directions of the muffle 21, the flame flow can be easily moved along the outer peripheral direction of the muffle 21, A predetermined indirect heating atmosphere temperature can be achieved in a short time, and a higher energy saving effect can be obtained.
[0019]
【The invention's effect】
As described above, according to the sintered product manufacturing apparatus and manufacturing method of the present invention, the lubricant contained in the molded product can be burned or decomposed substantially uniformly to obtain a high-quality sintered product. At the same time, it is possible to provide a method for producing a sintered product that can improve the yield.
[Brief description of the drawings]
FIG. 1 is a side view of a sintered product manufacturing apparatus according to an embodiment of the present invention, that is, a sintering furnace.
FIG. 2 is a cross-sectional view showing a dewaxing portion of the sintering furnace in FIG.
FIG. 3 is a cross-sectional view showing another example of the dewaxing portion in FIG. 2;
FIG. 4 is a side sectional view showing an example of a dewaxing portion in a conventional sintering furnace.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Sintering furnace (manufacturing apparatus), 11 ... Dewaxing part, 21 ... Muffle (furnace core tube), 22, 23 ... Gas burner (heating means)

Claims (4)

焼結炉に備えられた脱ろう部,予熱室,焼結室,冷却ゾーンへと順次被成形品を搬送することによって、該被成形品を焼結製品とする焼結製品の製造装置であって、前記脱ろう部は、その内部に配置されたマッフルと、このマッフル内を間接的に加熱して間接的加熱雰囲気温度とする加熱手段と、を有し、
前記加熱手段は、前記マッフルの外面部に対向し、前記マッフルの一方の側面の上部に向かうように配設された一方のガスバーナと、前記一方の側面に対向する対向側面の下部に向かうように配設された他方のガスバーナとを有し、前記一方のガスバーナによる火炎流が前記側面の外側上部から前記マッフルの上方を伝って前記対向側面方向に回るようにすると共に、他方のガスバーナによる火炎流が前記対向側面の外側下部から前記マッフルの下方を伝って前記側面方向に回るように構成されており、
前記間接的加熱雰囲気温度中で前記被成形品中に含まれる潤滑剤を燃焼又は分解させて除去させることを特徴とする焼結製品の製造装置。
An apparatus for manufacturing a sintered product, in which the molded product is sequentially conveyed to a dewaxing section, a preheating chamber, a sintering chamber, and a cooling zone provided in the sintering furnace. The dewaxing portion has a muffle disposed therein, and heating means for indirectly heating the inside of the muffle to obtain an indirect heating atmosphere temperature,
The heating means faces the outer surface of the muffle, faces one gas burner disposed toward the upper part of one side of the muffle, and faces the lower part of the opposite side facing the one side. And the other gas burner is arranged so that the flame flow caused by the one gas burner travels from the outer upper part of the side surface over the muffle toward the opposite side surface and the flame flow caused by the other gas burner. Is configured to rotate in the lateral direction along the lower side of the muffle from the lower outer side of the opposing side surface,
An apparatus for producing a sintered product, wherein the lubricant contained in the molded article is removed by burning or decomposing at the indirect heating atmosphere temperature.
前記一方のガスバーナは、前記マッフルの前記一方の側面に近接するにしたがい漸次上方へ向かうように前記一方の側面に対して傾斜するように配置され、
前記他方のガスバーナは、前記マッフルの前記対向側面に近接するにしたがい漸次下方へ向かうように前記対向側面に対して傾斜するように配置されていることを特徴とする請求項1に記載の焼結製品の製造装置。
The one gas burner is disposed so as to be inclined with respect to the one side surface so as to gradually move upward as it approaches the one side surface of the muffle,
2. The sintering according to claim 1, wherein the other gas burner is disposed so as to be inclined with respect to the opposite side surface so as to gradually move downward as it approaches the opposite side surface of the muffle. Product manufacturing equipment.
焼結炉に備えられた脱ろう部,予熱室,焼結室,冷却ゾーンへと順次被成形品を搬送することによって、該被成形品を焼結製品とする焼結製品の製造方法であって、前記脱ろう部は、その内部に配置されたマッフルと、このマッフル内を間接的に加熱して間接的加熱雰囲気温度とする加熱手段と、を有し、
前記加熱手段は、前記マッフルの外面部に対向し、前記マッフルの一方の側面の上部に向かうように配設された一方のガスバーナと、前記一方の側面に対向する対向側面の下部に向かうように配設された他方のガスバーナとを有し、前記一方のガスバーナによる火炎流が前記側面の外側上部から前記マッフルの上方を伝って前記対向側面方向に回るようにすると共に、他方のガスバーナによる火炎流が前記対向側面の外側下部から前記マッフルの下方を伝って前記側面方向に回るように構成されており、
前記間接的加熱雰囲気温度中で前記被成形品中に含まれる潤滑剤を燃焼又は分解させて除去させることを特徴とする焼結製品の製造方法。
This is a method for producing a sintered product in which the molded product is sequentially conveyed to a dewaxing section, a preheating chamber, a sintering chamber, and a cooling zone provided in the sintering furnace. The dewaxing portion has a muffle disposed therein, and heating means for indirectly heating the inside of the muffle to obtain an indirect heating atmosphere temperature,
The heating means faces the outer surface of the muffle, faces one gas burner disposed toward the upper part of one side of the muffle, and faces the lower part of the opposite side facing the one side. And the other gas burner is arranged so that the flame flow caused by the one gas burner travels from the outer upper part of the side surface over the muffle toward the opposite side surface and the flame flow caused by the other gas burner. Is configured to rotate in the lateral direction along the lower side of the muffle from the lower outer side of the opposing side surface,
A method for producing a sintered product, characterized in that the lubricant contained in the article to be molded is burned or decomposed and removed in the indirectly heated atmosphere temperature.
前記一方のガスバーナは、前記マッフルの前記一方の側面に近接するにしたがい漸次上方へ向かうように前記一方の側面に対して傾斜するように配置され、
前記他方のガスバーナは、前記マッフルの前記対向側面に近接するにしたがい漸次下方へ向かうように前記対向側面に対して傾斜するように配置されていることを特徴とする請求項3に記載の焼結製品の製造方法。
The one gas burner is disposed so as to be inclined with respect to the one side surface so as to gradually move upward as it approaches the one side surface of the muffle,
The other gas burner, sintering according to claim 3, characterized in that it is arranged so as to be inclined with respect to the opposite sides as gradually directed downward according to proximity to the opposite sides of the muffle Product manufacturing method.
JP2000323609A 2000-10-24 2000-10-24 Sintered product manufacturing apparatus and method Expired - Lifetime JP4519302B2 (en)

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JP5550924B2 (en) * 2010-01-26 2014-07-16 光洋サーモシステム株式会社 Continuously heated muffle furnace
CN102331172A (en) * 2011-08-10 2012-01-25 苏州恒瑞粉末冶金制造有限公司 Sintering furnace with wax removal function

Citations (6)

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Publication number Priority date Publication date Assignee Title
JPS58174505A (en) * 1982-01-12 1983-10-13 ライナ−・ザルネス Method of removing lubricant from metal powder-compressed formed body
JPS62180038U (en) * 1986-05-06 1987-11-16
JPS6352085B2 (en) * 1980-03-28 1988-10-18 Yamazaki Denki Kk
JPH03158696A (en) * 1989-11-17 1991-07-08 Tdk Corp Kiln
JPH05280867A (en) * 1992-03-30 1993-10-29 Ngk Insulators Ltd Corner jet fire type kiln
JPH1180808A (en) * 1997-09-08 1999-03-26 Ishikawajima Harima Heavy Ind Co Ltd Method for sintering compact consisting of metal powder and continuous sintering furnace

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6352085B2 (en) * 1980-03-28 1988-10-18 Yamazaki Denki Kk
JPS58174505A (en) * 1982-01-12 1983-10-13 ライナ−・ザルネス Method of removing lubricant from metal powder-compressed formed body
JPS62180038U (en) * 1986-05-06 1987-11-16
JPH03158696A (en) * 1989-11-17 1991-07-08 Tdk Corp Kiln
JPH05280867A (en) * 1992-03-30 1993-10-29 Ngk Insulators Ltd Corner jet fire type kiln
JPH1180808A (en) * 1997-09-08 1999-03-26 Ishikawajima Harima Heavy Ind Co Ltd Method for sintering compact consisting of metal powder and continuous sintering furnace

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