JPS60181201A - Method and furnace for heating green compact molding for sintering and forging - Google Patents
Method and furnace for heating green compact molding for sintering and forgingInfo
- Publication number
- JPS60181201A JPS60181201A JP3457784A JP3457784A JPS60181201A JP S60181201 A JPS60181201 A JP S60181201A JP 3457784 A JP3457784 A JP 3457784A JP 3457784 A JP3457784 A JP 3457784A JP S60181201 A JPS60181201 A JP S60181201A
- Authority
- JP
- Japan
- Prior art keywords
- forging
- heating
- sintering
- heating furnace
- sintered
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
Abstract
Description
【発明の詳細な説明】
Ｃ産業上の利用分野〕
本発明は、焼結鍛造用圧粉成形体の加熱方法およびその
加熱炉に関し、詳しくは、焼結鍛造部品を製造するため
に、所望の金属粉末、黒鉛粉末。[Detailed Description of the Invention] C. Industrial Application Field] The present invention relates to a method for heating a compacted compact for sintered forging and a heating furnace thereof, and more specifically, to a method for heating a compacted compact for sintered forging and a heating furnace for the same. Metal powder, graphite powder.
潤滑剤粉末等の混合粉末からなる焼結鍛造用圧粉成形体
を加熱・焼結するとともに、その焼結鍛造用圧粉成形体
の焼結時における高温加熱状態を利用して直接鍛造成形
することのできる、焼結鍛造用圧粉成形体の加熱方法お
よびその加熱炉にかかる。A powder compact for sintering and forging made of mixed powder such as lubricant powder is heated and sintered, and the compact for sintering and forging is directly forged using the high temperature heating state during sintering. The present invention relates to a method of heating a compacted compact for sintering and forging, and a heating furnace thereof.
焼結鍛造法は、鉄粉等の金属粉末を圧粉成形した焼結鍛
造用圧粉成形体を、焼結加熱後鍛造する部品成形方法で
、従来の熱間鍛造法に比較して部品製造における材料歩
留りが高く、精度の優れた部品を製造することができる
ことがら、機械加工を大幅に省略できるというメリソ］
・がある。The sinter forging method is a part forming method in which a powder compact for sinter forging is made by compacting metal powder such as iron powder, and is then forged after sintering and heating. Meriso has a high material yield and can manufacture parts with excellent precision, making it possible to significantly eliminate machining.]
・There is.
また、通常の焼結法や鋳造法により製造された部品に比
較して、高強度とすることができるという利点もある。It also has the advantage of being higher in strength than parts manufactured by normal sintering or casting methods.
このため、最近、焼結鍛造法は部品製造における大幅な
コスト低減、省資源、省エネルギを図ることのできる新
しい部品成形法として注目されている。For this reason, the sinter forging method has recently attracted attention as a new part forming method that can significantly reduce costs, save resources, and save energy in parts manufacturing.
ところで、金属粉末を圧粉成形した焼結鍛造用圧粉成形
体を鍛造面加熱する場合において、ポイントとなるのは
、鍛造前加熱ザイクルを品質的な問題を発生させること
なく、いかに鍛造サイクルに適合させるかということで
ある。By the way, when heating the forging surface of a compacted compact for sintered forging made by compacting metal powder, the key point is how to adjust the pre-forging heating cycle to the forging cycle without causing quality problems. The question is whether it is compatible.
このような理由から、どのような鍛造面加熱システムと
したらよいか、加熱炉の構造をいかにすべきかというこ
とが、焼結鍛Ｍ法を実用的に普及させる上での重要なポ
イントとなっている。For these reasons, what kind of forging surface heating system should be used and how the heating furnace should be structured are important points in the practical dissemination of the sinter-forging M method. There is.
そして、従来の焼結鍛造法における焼結鍛造用圧粉成形
体の鍛造前加熱方法には、焼結鍛造用圧粉成形体を加熱
焼結後一旦室温まで冷却し、これを鍛造温度まで再加熱
して鍛造成形する再加熱法と、焼結鍛造用圧粉成形体を
加熱・焼結し、その焼結時の高温加熱状態を利用して直
接鍛造成形する直接加熱法とが採用されている。In the conventional sinter forging method, the pre-forging method for heating the compact for sinter forging involves cooling the compact for sinter forging to room temperature once after heating and sintering, and then re-cooling it to the forging temperature. The reheating method involves heating and forging, and the direct heating method involves heating and sintering the powder compact for sintered forging, and directly forging using the high-temperature heating state during sintering. There is.
そして、前者の再加熱法においては、焼結された部品表
面に“肌アレ゛、“割れ”発生等の品質上の問題はない
ものの、焼結鍛造用圧粉成形体を加熱・焼結して室温ま
で冷却後、鍛造成形するために改めて加熱する必要があ
ることから、設備的に、また、エネルギ的に無駄が多く
好ましい加熱方法とはいえない。In the former reheating method, although there are no quality problems such as "skin lining" or "cracks" on the surface of the sintered part, it is difficult to heat and sinter the powder compact for sintering and forging. After cooling to room temperature, it is necessary to heat the product again for forging, which is wasteful in terms of equipment and energy, and cannot be said to be a preferable heating method.
一方、後者の直接加熱法においては、従来、以下のよう
な問題点があった。On the other hand, the latter direct heating method has conventionally had the following problems.
即ち、
■、焼結鍛造用圧粉成形体を圧粉成形するに当たって、
潤滑剤として通常ステアリン酸亜鉛等を添加しているが
、この潤滑剤を含有した焼結鍛造用圧粉成形体を、高温
に加熱保持された加熱炉中に装入すると、ステアリン酸
亜鉛が大量に熱分解してガスを発生ずることにより、焼
結部品表面が荒れたり（いわゆる“肌アレ”）、パ割れ
”たりして、焼結工程において焼結部品の品質上の不具
合を発生することがある。That is, (1) When compacting a powder compact for sintering and forging,
Zinc stearate is usually added as a lubricant, but when a compact for sintering and forging containing this lubricant is placed in a heating furnace heated and maintained at a high temperature, a large amount of zinc stearate is added. Due to thermal decomposition and generation of gas, the surface of the sintered parts becomes rough (so-called "skin irritation") and cracks, resulting in quality defects of the sintered parts during the sintering process. There is.
■、ステアリン酸亜鉛等の潤滑剤を添加しないで型潤滑
により焼結鍛造用圧粉成形体を圧粉成形する方法も試み
られているが、粉末成形型における焼付等を発生しやす
いことから、焼結鍛造用圧粉成形体の量産性を考えると
、ステアリン酸亜鉛等の潤滑剤を添加した圧粉成形方法
にはかなわない。■ A method of compacting a powder compact for sinter forging by using mold lubrication without adding a lubricant such as zinc stearate has been attempted, but this method tends to cause seizure etc. in the powder compaction die. When considering the mass productivity of powder compacts for sintering and forging, powder compacting methods in which a lubricant such as zinc stearate is added are no match.
ここで、■の問題点に対しては、焼結鍛造部品の生産量
が少なく、従って、加熱する焼結鍛造用圧粉成形体の数
量が少ない場合においては、急速に加熱することにより
、ステアリン酸亜鉛の熱分解に伴うガス発生による弊害
を抑制できることから、“肌アレ”を防止できるという
報告（Ｈｏｇａｎａｓ、ＰＭ Ｉ ｒｏｎ Ｐｏ１ｙｄ
ｅｒ Ｉｎｆｏｒｍａｔｉｏｎ ＰＭ８０−８）はある
ものの、量産的に焼結鍛造する場合には従来のような単
に急速加熱するだけでは、ステアリン酸亜鉛の熱分解に
伴うガス発生による弊害を完全には抑制できないことか
ら、焼結した焼結部品表面での“肌アレ”、“割れ”等
の表面欠陥を完全には防止できない。Here, regarding problem (2), if the production volume of sintered forged parts is small, and therefore the number of powder compacts for sintered forging to be heated is small, it is possible to solve the problem by heating rapidly. It has been reported that "skin irritation" can be prevented by suppressing the harmful effects of gas generation associated with the thermal decomposition of zinc oxide (Hoganas, PM Iron Polyd
er Information PM80-8), however, when performing sinter forging in mass production, it is not possible to completely suppress the harmful effects of gas generation due to thermal decomposition of zinc stearate simply by rapid heating as in the past. Therefore, surface defects such as "skin roughness" and "cracks" on the surface of the sintered parts cannot be completely prevented.
このため、ステアリン酸亜鉛等の潤滑剤を含有した焼結
鍛造用圧粉成形体を鍛造面加熱する場合においては、ま
ず、４００〜６００℃の低温ゾーンに装入して潤滑剤の
熱分解により発生するガスを放出させた後、高温ゾーン
にて高温に加熱して焼結および鍛造前加熱する必要があ
った。Therefore, when heating a sintered forging compact containing a lubricant such as zinc stearate on the forging surface, it is first charged into a low-temperature zone of 400 to 600°C to cause thermal decomposition of the lubricant. After releasing the generated gas, it was necessary to heat the product to a high temperature in a high temperature zone before sintering and forging.
従って、従来の焼結鍛造用圧粉成形体の鍛造前加熱法に
おいては、低温ゾーン加熱という余分の工程が必要とな
るという欠点があった。Therefore, the conventional pre-forging heating method for powder compacts for sintering and forging has the drawback of requiring an extra step of low-temperature zone heating.
上述のような理由から、従来の焼結鍛造用圧粉成形体の
加熱法においては、加熱炉の高温ゾーンに直接潤滑剤を
含んだ焼結鍛造用圧粉成形体を大量に加熱する方法をと
ることができないという問題点があった。For the reasons mentioned above, the conventional heating method for sintering and forging powder compacts involves heating a large amount of sintering and forging compacts containing lubricant directly in the high-temperature zone of the heating furnace. The problem was that it could not be taken.
本発明は、上述の従来技術の問題点を解決するためにな
されたもので、ステアリン酸亜鉛等の潤滑剤を含有した
焼結鍛造用圧粉成形体を、定常的に送給され加熱炉内を
非酸化性雰囲気とするとともに、潤滑剤の熱分解により
発生するガスを速やかに加熱炉外に排出する雰囲気ガス
流の存在下において、焼結鍛造用圧粉成形体を加熱炉の
高温ゾーンに直接装入して急速に昇温させて加熱保持す
ることにより焼結鍛造用圧粉成形体を焼結するとともに
、その焼結時の高温加熱状態を鍛造前加熱として利用し
、焼結された焼結部品表面における゛肌アレ゛、“割れ
゛等の品質上の不具合を発生することなく、短時間でし
かも効率よく焼結鍛造用圧粉成形体の鍛造成形前加熱を
することのできる焼結鍛造用圧粉成形体の加熱方法およ
びその加熱炉を提供することを目的としている。The present invention was made in order to solve the problems of the prior art described above, and a powder compact for sintering and forging containing a lubricant such as zinc stearate is constantly fed into a heating furnace. The green compact for sintering and forging is placed in the high-temperature zone of the heating furnace in the presence of a non-oxidizing atmosphere and an atmospheric gas flow that quickly discharges the gas generated by the thermal decomposition of the lubricant out of the heating furnace. The powder compact for sintering and forging is sintered by directly charging the powder, rapidly raising the temperature, and maintaining the temperature.The high-temperature heating state during sintering is also used as pre-forging heating, and the sintered powder compact is sintered. A sintering system that can heat compacted compacts for sinter forging in a short time and efficiently before forging, without causing quality defects such as "texture" or "cracking" on the surface of sintered parts. The object of the present invention is to provide a method for heating a green compact for forging and a heating furnace for the same.
このような目的は、本発明によれば、焼結鍛造部品の製
造に当たって、焼結鍛造用圧粉成形体を焼結しその焼結
時の高温加熱状態から直接鍛造成形する焼結鍛造用圧粉
成形体の加熱方法およびその加熱炉であって、
ステアリン酸亜鉛等の潤滑剤を含有した前記焼結鍛造用
圧粉成形体を、定常的に送給され加熱炉内を非酸化性雰
囲気とするとともに潤滑剤の熱分解により発生するガス
を速やかに加熱炉外に排出する雰囲気ガス流の存在下に
おいて、８００〜１２００℃に加熱保持された加熱炉に
直接装入してｉｏｏ℃／ｍｉｎ以上の昇温速度で加熱後
、１０００〜１２００℃の鍛造温度範囲に均熱すること
を特徴とする焼結鍛造用圧粉成形体の加熱方法、および
、前記加熱炉は、ステアリン酸亜鉛等の潤滑剤を含有し
た前記焼結鍛造用圧粉成形体の装入口と搬出口を有する
炉枠で包囲され、焼結鍛造用圧粉成形体を載置する炉床
には焼結鍛造用圧粉成形体を装入口から搬出口に向かっ
て搬送する搬送機構を有するとともに、加熱炉内が８０
０〜１２００℃に加熱保持された昇温ゾーンと、１００
０〜１２００℃に加熱保持された均熱ゾーンに、炉壁に
配置された隔壁によって区画され、加熱炉内を非酸化性
雰囲気とするとともに潤滑剤の熱分解により発生したガ
スを速やかに加熱炉外に排出する加熱炉内雰囲気ガス流
を形成する雰囲気ガスの送給口を、昇温ゾーンと均熱ゾ
ーンの隔壁近傍に配設し雰囲気ガス吐出口の吐出方向を
加熱炉における焼結鍛造用圧粉成形体の装入口の方向に
向けたことを特徴とした焼結鍛造用圧粉成形体の加熱炉
によって達成される。According to the present invention, in the production of sintered forged parts, a sintered forged compact is sintered and forged directly from the high temperature heated state during sintering. A method for heating a powder compact and a heating furnace thereof, wherein the powder compact for sintering and forging containing a lubricant such as zinc stearate is constantly fed to create a non-oxidizing atmosphere in the heating furnace. At the same time, in the presence of an atmospheric gas flow that quickly discharges the gas generated by thermal decomposition of the lubricant out of the heating furnace, the lubricant is directly charged into a heating furnace heated and maintained at 800 to 1200°C at a rate of ioo°C/min or more. A method for heating a green compact for sintering and forging, characterized in that after heating at a temperature increase rate of The powder compact for sintering and forging is surrounded by a furnace frame having a charging inlet and an outlet for the powder compact for sintering and forging, and the hearth on which the powder compact for sintering and forging is placed. It has a conveyance mechanism that conveys the body from the charging inlet toward the unloading outlet, and the inside of the heating furnace is
A heating zone heated and maintained at 0 to 1200°C, and 100°C
A soaking zone heated and maintained at 0 to 1200°C is divided by a partition wall placed on the furnace wall, which creates a non-oxidizing atmosphere inside the heating furnace and quickly removes the gas generated by thermal decomposition of the lubricant. The supply port for the atmospheric gas that forms the atmospheric gas flow inside the heating furnace that is discharged to the outside is arranged near the partition wall between the temperature rising zone and the soaking zone, and the discharge direction of the atmospheric gas discharge port is set for sintering and forging in the heating furnace. This is achieved by a heating furnace for a compacted compact for sintering and forging, which is oriented toward the charging port of the compacted compact.
以下、添付図面に基づいて、本発明の詳細な説明する。 Hereinafter, the present invention will be described in detail based on the accompanying drawings.
第１図は、本発明の第１の実施例である、焼結鍛造用圧
粉成形体の急速加熱焼結鍛造用に設計した炉床回転式加
熱炉の概略平面図、第２図は、そのＡ−Ａ断面拡大図を
示している。FIG. 1 is a schematic plan view of a rotary hearth heating furnace designed for rapid heating and sintering of compacted compacts for sintering and forging, which is the first embodiment of the present invention, and FIG. An enlarged view of the AA cross section is shown.
以下、第１図および第２図に基づいて、本発明の焼結鍛
造用圧粉成形体の加熱方法及びその加熱炉について述べ
る。Hereinafter, based on FIGS. 1 and 2, a method for heating a powder compact for sintering and forging according to the present invention and a heating furnace thereof will be described.
鉄粉、黒鉛粉末、圧粉成形時の潤滑剤としてのステアリ
ン酸亜鉛を混粉し、ついで、必要に応してＣｕ、Ｎｉ、
Ｍｏ等を添加もしくは合金化した粉末を混粉して、密度
が約６．５ｇ／Ｃｍ’の焼結鍛造用圧粉成形体５に圧粉
成形した。Iron powder, graphite powder, and zinc stearate as a lubricant during powder compaction are mixed together, and then Cu, Ni,
A powder to which Mo or the like was added or alloyed was mixed and compacted into a powder compact for sintering and forging 5 having a density of about 6.5 g/Cm'.
そして、この焼結鍛造用圧粉成形体５を装入口８から加
熱炉の昇温ゾーンａに装入し、焼結鍛造用圧粉成形体５
を回転炉床４上に載置した。Then, this green compact for sintering and forging 5 is charged into the heating zone a of the heating furnace through the charging port 8, and the green compact for sintering and forging is
was placed on the rotary hearth 4.
ここで、昇温ゾーンａは１１００℃に、また、均熱ゾー
ンｂ、ｃは１１５０℃にモリブデンヒータ７により加熱
保持した。Here, the temperature increasing zone a was heated to 1100° C., and the soaking zones b and c were heated to 1150° C. by a molybdenum heater 7.
なお、加熱炉内の雰囲気ガスとしては非酸化性雰囲気ガ
スを使用するものとし、この実施例においては吸熱型ガ
スを使用した。Note that a non-oxidizing atmospheric gas was used as the atmospheric gas in the heating furnace, and in this example, an endothermic gas was used.
この雰囲気ガスは加熱炉山数箇所に設けられた送給口か
ら送給され、第１図においては昇温ゾーンａに設けられ
た送給口を６に示す。This atmospheric gas is fed from feed ports provided at several locations on the heating furnace, and in FIG. 1, the feed port provided in the temperature rising zone a is shown at 6.
加熱炉内に装入された焼結鍛造用圧粉成形体５は高温に
加熱保持された昇温ゾーンａにおいて、直ちに高温に加
熱される。The compacted compact 5 for sintering and forging charged into the heating furnace is immediately heated to a high temperature in the temperature increasing zone a where it is heated and maintained at a high temperature.
そして、この時にステアリン酸亜鉛の熱分解に伴う大量
のガスを発生する。At this time, a large amount of gas is generated due to thermal decomposition of zinc stearate.
なお、雰囲気ガスの送給口６の吐出口６ａが加熱炉の焼
結鍛造用圧粉成形体５の装入口８の方向を向いており、
大量の吸熱型ガスが装入口８に向かって定常的に流れて
おり加熱炉内に一様な雰囲気ガス流を形成している。Note that the discharge port 6a of the atmospheric gas supply port 6 faces the charging port 8 of the powder compact 5 for sintering and forging of the heating furnace,
A large amount of endothermic gas constantly flows toward the charging port 8, forming a uniform atmospheric gas flow within the heating furnace.
このため、ステアリン酸亜鉛の熱分解により発生したガ
スは、雰囲気ガスとともに焼結鍛造用圧粉成形体５の装
入口８から速やかに加熱炉外に排出される。Therefore, the gas generated by thermal decomposition of zinc stearate is quickly discharged to the outside of the heating furnace from the charging port 8 of the powder compact 5 for sintering and forging together with the atmospheric gas.
この実施例においては、雰囲気ガスとしての吸熱型ガス
送給量を２０ｍ’／Ｈとした。In this example, the amount of endothermic gas supplied as the atmospheric gas was 20 m'/H.
なお、昇温ゾーンａにおける焼結鍛造用圧粉成形体５の
昇温速度が１００℃／ｍｉｎより遅い場合には、５００
〜７００℃の温度域を通過する時間が長くなるため、雰
囲気ガス中のｃｏガスが加熱された焼結鍛造用圧粉成形
体５表面と反応して炭素を析出する反応がステアリン酸
亜鉛の大量熱分解により急速に進行する
この結果として、加熱された焼結鍛造用圧粉成形体５表
面に“肌アレ”、“割れ°゛等の表面欠陥を発生しやす
いことから、昇温速度はｌｏｏ℃／ｍｉｎ以上とする必
要がある。In addition, when the temperature increase rate of the powder compact 5 for sinter forging in the temperature increase zone a is slower than 100 °C/min, the
Since the time required to pass through the temperature range of ~700°C is longer, a reaction in which co gas in the atmosphere reacts with the surface of the heated sintered and forged powder compact 5 to precipitate carbon occurs, causing a large amount of zinc stearate. As a result of this rapid thermal decomposition, surface defects such as "skin roughness" and "cracks" are likely to occur on the surface of the heated powder compact for sintering and forging 5, so the temperature increase rate is too low. It is necessary to set it to ℃/min or more.
また、昇温ゾーンａにおいて急速昇温された焼結鍛造用
圧粉成形体５は、均熱ゾーンｂ、ｃを通過する過程で加
熱焼結されるとともに、鍛造成形に適した１１５０℃に
加熱され加熱炉の搬出口９から搬出され、直ちに、鍛造
プレスにて鍛造成形される。In addition, the powder compact for sintering and forging 5 whose temperature has been rapidly raised in temperature raising zone a is heated and sintered in the process of passing through soaking zones b and c, and is also heated to 1150°C, which is suitable for forging. It is then carried out from the outlet 9 of the heating furnace and immediately forged in a forging press.
その後、空冷もしくは熱処理等を行って、完成焼結鍛造
部品とするものである。Thereafter, air cooling or heat treatment is performed to obtain a completed sintered forged part.
第３図および第４図は、本発明の第２の実施例である焼
結鍛造用圧粉成形体５の急速加熱焼結鍛造用の炉床回転
式加熱炉を示している。3 and 4 show a hearth rotary heating furnace for rapid heating and sintering and forging of a powder compact 5 for sintering and forging, which is a second embodiment of the present invention.
そして、第３図はこの実施例の炉床回転式加熱炉の概略
平面図、第２図はそのＡ−Ａ断面拡大図。FIG. 3 is a schematic plan view of the rotary hearth type heating furnace of this embodiment, and FIG. 2 is an enlarged cross-sectional view taken along line A-A.
第４図はそのＢ−Ｂ断面拡大図を示している。FIG. 4 shows an enlarged cross-sectional view taken along line B-B.
その構造は第１の実施例と同様に、焼結鍛造用圧粉成形
体５が装入口８から装入されて回転炉床４上に載置され
、昇温ゾーンａ、均熱ゾーンｂ。Its structure is similar to that of the first embodiment, in which a compacted compact for sintering and forging 5 is charged through a charging port 8 and placed on a rotary hearth 4, with a heating zone a and a soaking zone b.
Ｃを通過してモリブデンヒータ７により加熱・焼結され
た後、搬出口９から搬出され鍛造プレスにて鍛造される
ものである。After passing through C and being heated and sintered by a molybdenum heater 7, it is carried out through an outlet 9 and forged in a forging press.
そして、この実施例において加熱炉内の雰囲気ガスは、
各ゾーンに設けられた複数の雰囲気ガスの送給口６から
加熱炉内に導入される。In this example, the atmospheric gas in the heating furnace is
Atmospheric gas is introduced into the heating furnace through a plurality of atmospheric gas supply ports 6 provided in each zone.
そして、雰囲気ガスの送給口６は焼結鍛造用圧粉成形体
５に含有されているステアリン酸亜鉛の ９
２
熱分解に伴いガスを発生する昇温ゾーンａと均熱ゾーン
ｂの隔壁３ａ近傍に設けられ、その雰囲気ガスの吐出口
６ａを焼結鍛造用圧粉成形体５の装入口８の方向に向け
て雰囲気ガスを吐出する。The atmospheric gas supply port 6 is a partition wall 3a between the temperature rising zone a and the soaking zone b, where gas is generated due to the thermal decomposition of zinc stearate contained in the powder compact 5 for sintering and forging. It is provided nearby and discharges the atmospheric gas with its discharge port 6a directed toward the charging port 8 of the green compact 5 for sintering and forging.
なお、この実施例においては雰囲気ガス送給量を２０ｍ
３／Ｈとした。In addition, in this example, the atmospheric gas supply amount was set to 20 m.
It was set as 3/H.
さらに、この実施例においいては、焼結鍛造用圧粉成形
体５の装入口８近傍の加熱炉天井部にベント部ｌＯを配
設し、潤滑剤ステアリン酸亜鉛の熱分解ガスを加熱炉上
方または装入口８の方向に向けて加熱炉内雰囲気ガスと
ともに一様かつ速やかに加熱炉外に排出する構造として
いる。Furthermore, in this embodiment, a vent part 1O is provided on the ceiling of the heating furnace near the charging port 8 of the powder compact 5 for sintering and forging, and the pyrolysis gas of the lubricant zinc stearate is directed above the heating furnace. Alternatively, the structure is such that it is uniformly and quickly discharged to the outside of the heating furnace along with the atmospheric gas inside the heating furnace in the direction of the charging port 8 .
なお、ベント部１０の位置、開口径は焼結鍛造部品の加
熱数量（生産量）に応じて適宜選択することができる。Note that the position and opening diameter of the vent portion 10 can be appropriately selected depending on the number of heated sintered forged parts (production amount).
以上により明らかなように、本発明にががる焼結鍛造用
圧粉成形体の加熱方法によれば、ステアリン酸亜鉛等の
潤滑剤を含有した焼結鍛造用圧粉成形体を、定常的に送
給され加熱炉内を非酸化性４
雰囲気とするとともに潤滑剤の熱分解により発生するガ
スを速やかに加熱炉外に排出する雰囲気ガス流の存在下
において、直接加熱炉の高温ゾーンに装入して、急速に
昇温させて加熱保持することにより焼結鍛造用圧粉成形
体を加熱・焼結するとともに、その焼結時の高温状態を
鍛造面加熱として利用し、焼結された焼結部品表面にお
ける“肌アレ”、“割れ”等の品質上の不具合を発生す
ることなく、短時間でしかも効率よく焼結鍛造用圧粉成
形体の鍛造成形前加熱をすることができる利点がある。As is clear from the above, according to the method of heating a compacted compact for sintered forging according to the present invention, a compacted compact for sintered forging containing a lubricant such as zinc stearate is heated in a steady state. Directly installed in the high temperature zone of the heating furnace in the presence of an atmospheric gas flow that creates a non-oxidizing atmosphere in the heating furnace and quickly discharges the gas generated by thermal decomposition of the lubricant to the outside of the heating furnace. The powder compact for sintering and forging is heated and sintered by heating and maintaining the temperature rapidly, and the high temperature state during sintering is used to heat the forging surface. The advantage is that it is possible to quickly and efficiently heat a powder compact for sinter forging before forging, without causing quality defects such as "skin irritation" or "cracks" on the surface of the sintered part. There is.
また、本発明にかかる焼結鍛造用圧粉成形体の加熱炉に
よれば、焼結鍛造用圧粉成形体の圧粉成形において型ｌ
ｌＩ涜法をとらな（て従来の潤滑剤混粉法でよいことか
ら、焼結鍛造部品の量産性、型寿命を損なうことなく、
従来焼結鍛造法のネックとなっていた焼結鍛造用圧粉成
形体の加熱工程が改善され、焼結鍛造法の生産性をたか
めることができ、しかも、加熱炉の低温ゾーンが不要と
なるため、加熱炉をコンパクトとすることができる利５
点がある。Further, according to the heating furnace for a powder compact for sinter forging according to the present invention, the mold l
Since the conventional lubricant mixing method can be used without using unethical methods, mass production of sintered forged parts and mold life are not compromised.
The heating process for compacted compacts for sinter forging, which was a bottleneck in the conventional sinter forging method, has been improved, making it possible to increase the productivity of the sinter forging method, and eliminating the need for a low-temperature zone in the heating furnace. Therefore, there are five advantages in that the heating furnace can be made compact.
第１図は、本発明の第１の実施例における焼結鍛造用圧
粉成形体の加熱炉の概略平面図。
第２図は、第１図および第３図のＡ−Ａ断面図。
第３図は、本発明の第２の実施例における焼結鍛造用圧
粉成形体の加熱炉の概略平面図。
第４図は、第３図のＢ−Ｂ断面図である。
１．２−−−−−−炉壁
３ ａ、３ ｂ、３ ｃ−−−一隔壁
４−−−−−炉床
５−−−−焼結鍛造用圧粉成形体
６−−−一送給口
６ａ−−−−−一吐出口
７−−−−−モリブデンヒータ
８−−−−−−装入口
９−−−−−一搬出口
１０−−−−−−ベントロ
ａ−−−−−一昇温ゾーン
ｂ、ｃ−−−−−均熱ゾーン
６
【
第４−
一６−FIG. 1 is a schematic plan view of a heating furnace for a powder compact for sintering and forging in a first embodiment of the present invention. FIG. 2 is a sectional view taken along line AA in FIGS. 1 and 3. FIG. 3 is a schematic plan view of a heating furnace for a powder compact for sintering and forging in a second embodiment of the present invention. FIG. 4 is a sectional view taken along line BB in FIG. 3. 1.2------Furnace wall 3a, 3b, 3c---1 Partition wall 4---Heart 5------Powder compact for sintering and forging 6---1 Feeding port 6a ------- - Discharge port 7 ---- Molybdenum heater 8 ------- Charging port 9 ------- - Export port 10 ------- Vent flow a ---- --1 Temperature rising zone b, c---- Soaking zone 6 [No. 4-16-
Claims (1)
形体を焼結しその焼結時の高温加熱状態から直接鍛造成
形する焼結鍛造用圧粉成形体の加熱方法であって、 ステアリン酸亜鉛等の潤滑剤を含有した前記焼結鍛造用
圧粉成形体を、定常的に送給され加熱炉内を非酸化性雰
囲気とするとともに潤滑剤の熱分解により発生するガス
を速やかに加熱炉外に排出する雰囲気ガス流の存在下に
おいて、８００〜１２００ °ｃに加熱保持された加熱
炉に直接装入して１００℃／ｍｉｎ以上の昇温速度で加
熱後、１０００〜１２００℃の鍛造温度範囲に均熱する
ことを特徴とする焼結鍛造用圧粉成形体の加熱方法。 ２、焼結鍛造部品の製造に当たって、焼結鍛造用圧粉成
形体を焼結しその焼結時の高温加熱状態から直接鍛造成
形する焼結鍛造用圧粉成形体の加熱炉であって、 前記加熱炉は、ステアリン酸亜鉛等の／ｇＪ滑剤を含有
した前記焼結鍛造用圧粉成形体の装入口と搬出口を有す
る炉枠で包囲され、焼結鍛造用圧粉成形体を載置する炉
床には焼結鍛造用圧粉成形体を装入口から搬出口に向か
って搬送する搬送機構を有するとともに、加熱炉内が８
００〜１２００℃に加熱保持された昇温ゾーンと、１０
００〜１２００℃に加熱保持された均熱ゾーンに、炉壁
に配置された隔壁によって区画され、加熱炉内を非酸化
性雰囲気とするとともに潤滑剤の熱分解により発生した
ガスを速やかに加熱炉外に排出する雰囲気ガス流を形成
する雰囲気ガスの送給口を、昇温ゾーンと均熱ゾーンの
隔壁近傍に配設し雰囲気ガス吐出口の吐出方向を加熱炉
における焼結鍛造用圧粉成形体の装入口方向に向けたこ
とを特徴とした焼結鍛造用圧粉成形体の加熱炉。[Claims] 1. In the production of sintered forged parts, a powder compacted body for sintered forging is sintered and directly forged from the high temperature heating state during sintering. A heating method, in which the compacted compact for sintered forging containing a lubricant such as zinc stearate is constantly fed to create a non-oxidizing atmosphere in the heating furnace, and the lubricant is thermally decomposed. After being directly charged into a heating furnace heated and maintained at 800 to 1200 °C and heated at a temperature increase rate of 100 °C/min or more in the presence of an atmospheric gas flow that quickly discharges the generated gas out of the heating furnace. A method for heating a powder compact for sintering and forging, characterized by soaking it to a forging temperature range of 1000 to 1200°C. 2. A heating furnace for sintering and forging compacts, in which the compacts for sintering and forging are sintered and directly forged from the high-temperature heating state during sintering, in the production of sintered forging parts, The heating furnace is surrounded by a furnace frame having a charging inlet and an outlet for the powder compact for sintering and forging containing a /gJ lubricant such as zinc stearate, and the compact for sintering and forging is placed therein. The hearth has a conveyance mechanism for conveying the green compact for sintering and forging from the charging inlet toward the outlet.
A heating zone heated and maintained at 00 to 1200°C, and 10
A soaking zone heated and maintained at 00 to 1200 degrees Celsius is divided by a partition wall placed on the furnace wall to create a non-oxidizing atmosphere inside the heating furnace and to quickly transport the gas generated by thermal decomposition of the lubricant to the heating furnace. The supply port for the atmospheric gas that forms the atmospheric gas flow to be discharged to the outside is arranged near the partition wall between the heating zone and the soaking zone, and the direction of discharge of the atmospheric gas discharge port is adjusted to form a compact for sintering and forging in a heating furnace. A heating furnace for compacted compacts for sintering and forging, characterized in that it is oriented toward the charging port of the body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3457784A JPS60181201A (en) | 1984-02-24 | 1984-02-24 | Method and furnace for heating green compact molding for sintering and forging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3457784A JPS60181201A (en) | 1984-02-24 | 1984-02-24 | Method and furnace for heating green compact molding for sintering and forging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60181201A true JPS60181201A (en) | 1985-09-14 |
Family
ID=12418175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3457784A Pending JPS60181201A (en) | 1984-02-24 | 1984-02-24 | Method and furnace for heating green compact molding for sintering and forging |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60181201A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179518A (en) * | 2009-12-21 | 2011-09-14 | 气体产品与化学公司 | Method and atmosphere for prolonging service life of belt in sintering furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5854162A (en) * | 1981-09-28 | 1983-03-31 | 日本ホ−ムズ株式会社 | Assembling of iron framework for building |
| JPS5845328B2 (en) * | 1976-05-27 | 1983-10-08 | 凸版印刷株式会社 | Lamination method |
-
1984
- 1984-02-24 JP JP3457784A patent/JPS60181201A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5845328B2 (en) * | 1976-05-27 | 1983-10-08 | 凸版印刷株式会社 | Lamination method |
| JPS5854162A (en) * | 1981-09-28 | 1983-03-31 | 日本ホ−ムズ株式会社 | Assembling of iron framework for building |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179518A (en) * | 2009-12-21 | 2011-09-14 | 气体产品与化学公司 | Method and atmosphere for prolonging service life of belt in sintering furnace |
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