JPH0765081B2 - Sintering method of green compact - Google Patents

Sintering method of green compact

Info

Publication number
JPH0765081B2
JPH0765081B2 JP61295231A JP29523186A JPH0765081B2 JP H0765081 B2 JPH0765081 B2 JP H0765081B2 JP 61295231 A JP61295231 A JP 61295231A JP 29523186 A JP29523186 A JP 29523186A JP H0765081 B2 JPH0765081 B2 JP H0765081B2
Authority
JP
Japan
Prior art keywords
green compact
sintering
green
tape
sintering furnace
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.)
Expired - Lifetime
Application number
JP61295231A
Other languages
Japanese (ja)
Other versions
JPS63149303A (en
Inventor
義春 中野
由則 小熊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Materials Corp
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 Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Priority to JP61295231A priority Critical patent/JPH0765081B2/en
Publication of JPS63149303A publication Critical patent/JPS63149303A/en
Publication of JPH0765081B2 publication Critical patent/JPH0765081B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Furnace Charging Or Discharging (AREA)

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、圧粉体の焼結方法に係わり、特に、積み重
ねた圧粉体の落下防止の技術に関するものである。
Description: TECHNICAL FIELD The present invention relates to a method for sintering green compacts, and more particularly to a technique for preventing stacked green compacts from falling.

[従来の技術とその問題点] 従来、含油軸受などの焼結製品を製造する場合には、粉
末を圧縮成形してリング状の圧粉体を成形し、得られた
圧粉体を上下方向に複数積み重ねて焼結炉に挿入し、所
定温度で所定時間加熱して焼結するようにしている。と
ころが、圧粉体を単に積み重ねるだけでは、その搬送途
中に圧粉体どうしが径方向にずれ、上側に積み重ねた圧
粉体が落下して割れたり変形することがある。
[Prior art and its problems] Conventionally, when manufacturing a sintered product such as an oil-impregnated bearing, the powder is compression-molded to form a ring-shaped green compact, and the obtained green compact is vertically moved. A plurality of them are stacked and inserted into a sintering furnace, and heated at a predetermined temperature for a predetermined time for sintering. However, if the green compacts are simply stacked, the green compacts may be displaced in the radial direction during transportation, and the green compacts stacked on the upper side may drop and crack or deform.

そこで、圧粉体どうしが径方向へ互いにずれないよう
に、積み重ねた圧粉体の内周側に金属製のコア部材を挿
入することが考えられるが、焼結後の取扱いに支障を来
すという問題があった。すなわち、圧粉体を積み重ねて
焼結すると焼結体どうしが互いに付着するため、従来に
おいては機械的に、あるいは焼結体を落下させて分離す
るようにしている。ところが、焼結体の内周側にコア部
材が挿入された状態では分離することができない。この
ため、分離作業の前にまず手作業でコア部材を抜き取ら
なければならないのである。
Therefore, it is conceivable to insert a metal core member inside the stacked green compacts so that the green compacts do not shift from each other in the radial direction, but this will hinder handling after sintering. There was a problem. That is, when the green compacts are stacked and sintered, the sintered bodies adhere to each other. Therefore, conventionally, the sintered bodies are separated mechanically or by dropping. However, it cannot be separated in the state where the core member is inserted on the inner peripheral side of the sintered body. For this reason, the core member must first be manually extracted before the separating operation.

また、このコア部材の外径が圧粉体の内径とほぼ同一寸
法のとき、すなわち、コア部材の外周面が圧粉体の内周
面に当接した状態で挿入される場合、焼結時の高温状態
でコア部材が熱膨張し、圧粉体に内側から強い外力を与
えてしまい圧粉体に割れや変形が生じることがある。逆
に、このコア部材の外径が圧粉体の内径より十分小さい
とき、すなわち、コア部材の外周面との圧粉体の内周面
との間に広い間隙を有して挿入される場合、コア部材に
よる圧粉体の支持が不十分となり、搬送途中に圧粉体ど
うしがずれてしまうことがある。このため、コア部材の
外径は、コア部材及び圧粉体の互いの熱膨張を考慮する
とともに、圧粉体の内径にできるだけ近づけた寸法にす
る必要がある。しかしながら、積み重ねられた圧粉体
は、その内径にばらつきを有するため、すべての圧粉体
に対して適した外径を有するコア部材を挿入することは
困難であり、このため、焼結時における圧粉体の割れや
変形によって歩留りが低下していた。
When the outer diameter of the core member is approximately the same as the inner diameter of the green compact, that is, when the outer peripheral surface of the core member is inserted in contact with the inner peripheral surface of the green compact, sintering In the high temperature state, the core member thermally expands, and a strong external force is applied to the green compact from the inside, so that the green compact may be cracked or deformed. Conversely, when the outer diameter of the core member is sufficiently smaller than the inner diameter of the green compact, that is, when the core member is inserted with a wide gap between the outer peripheral surface and the inner peripheral surface of the green compact. However, the support of the green compact by the core member becomes insufficient, and the green compact may be displaced during the transportation. Therefore, the outer diameter of the core member needs to be set to be as close as possible to the inner diameter of the green compact while considering the thermal expansion of the core member and the green compact. However, it is difficult to insert a core member having an outer diameter suitable for all green compacts because the green compacts stacked have variations in internal diameter. The yield was reduced due to cracking and deformation of the green compact.

[発明の目的] この発明は、上記事情に鑑みてなされたもので、後工程
の作業に支障を来すことなく、積み重ねた圧粉体が互い
にずれるのを防止することができ、したがって、圧粉体
の落下による割れや変形の発生を未然に防止することが
でき、また、焼結時において割れ等を生じさせるような
強い外力を圧粉体に与えることのない圧粉体の焼結方法
を提供することを目的とする。
[Object of the Invention] The present invention has been made in view of the above circumstances, and it is possible to prevent the stacked green compacts from being displaced from each other without hindering the work of the post-process, and therefore A method for sintering a green compact that can prevent cracking and deformation due to falling of the powder, and that does not give a strong external force to the green compact that causes cracks during sintering. The purpose is to provide.

[問題点を解決するための手段] 上記課題を解決するための圧粉体の焼結方法として、リ
ング状をなす圧粉体をその軸線方向に複数積み重ねて焼
結炉に挿入し、上記圧粉体を加熱して焼結する圧粉体の
焼結方法において、上記圧粉体を焼結炉に挿入する前
に、上記焼結炉の炉内温度で焼失し得る材質からなり、
かつ圧粉体の積上げ高さと同程度の幅を有するテープを
環状にして圧粉体の内周側に配置するとともに、テープ
を弛緩させて圧粉体の内周面を押圧した状態とし、その
後、焼結炉で焼結する技術を採用する。
[Means for Solving Problems] As a method for sintering a green compact for solving the above problems, a plurality of ring-shaped green compacts are stacked in the axial direction and inserted into a sintering furnace, In a method for sintering a green compact which heats and sinters a powder, before the green compact is inserted into a sintering furnace, it is made of a material that can be burned down at the temperature inside the sintering furnace,
In addition, the tape having a width approximately equal to the pile height of the green compact is annularly arranged on the inner peripheral side of the green compact, and the tape is relaxed to press the inner peripheral surface of the green compact. , Adopt the technology of sintering in a sintering furnace.

また、リング状をなす圧粉体をその軸線方向に複数積み
重ねて焼結炉に挿入し、上記圧粉体を加熱して焼結する
圧粉体の焼結方法において、上記圧粉体を焼結炉に挿入
する前に、上記焼結炉の炉内温度で焼失し得る材質から
なり、かつ圧粉体の積上げ高さと同程度の幅を有するテ
ープを環状にして圧粉体の外周面に巻き付けるととも
に、テープの両端部を互いに接着し、その後、焼結炉で
焼結する技術を採用する。
Further, in the method for sintering a green compact, a plurality of ring-shaped green compacts are stacked in the axial direction and inserted into a sintering furnace, and the green compact is heated and sintered. Before being inserted into the binder, a tape made of a material that can be burned at the temperature inside the sintering furnace and having a width similar to the stack height of the green compact is formed into an annular shape on the outer peripheral surface of the green compact. A technique is adopted in which both ends of the tape are adhered to each other while the tape is wound and then sintered in a sintering furnace.

[実施例] 以下、本発明の一実施例を第1図を参照しながら説明す
る。図において符号1は圧粉体、2はテープである。圧
粉体1は、リング状をなすものであり、上下方向に複数
積み重ねられた状態でベルトコンベアなどの上に載置さ
れ、焼結炉に挿入されるようになっている。テープ2
は、ボール紙からなるものであり、その幅が積み重ねた
圧粉体1…の高さとほぼ同一とされ、長さが圧粉体1の
内周よりも長く設定されたものである。
[Embodiment] An embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 1 is a green compact, and 2 is a tape. The green compact 1 has a ring shape, and is placed on a belt conveyor or the like in a state where a plurality of green compacts are stacked in the vertical direction and inserted into a sintering furnace. Tape 2
Is made of cardboard, and its width is almost the same as the height of the stacked green compacts 1 ... And the length is set longer than the inner circumference of the green compact 1.

次に、上記テープ2を用いて圧粉体1…を焼結する方法
について説明する。まず、テープ2をその両端部が重な
り合うように環状にし、その外径が圧粉体1の内径より
も小さくなるように巻く。そして、テープ2を圧粉体1
…の内周側へ挿入する。すると、テープ2は弛緩して拡
径し、その外周面が圧粉体1…の内周面を押圧する。こ
のため、圧粉体1…は、その半径方向のいずれの方向へ
も相対移動し得ない状態となる。次に、圧粉体1…を焼
結炉に挿入して所定時間焼結する。すると、テープ2が
炉内温度により燃焼する。そして、所定時間加熱した後
に焼結炉から取り出す。
Next, a method of sintering the green compact 1 using the tape 2 will be described. First, the tape 2 is formed into an annular shape so that both ends thereof overlap with each other, and is wound such that the outer diameter thereof is smaller than the inner diameter of the green compact 1. Then, tape 2 to green compact 1
Insert on the inner side of. Then, the tape 2 relaxes and expands in diameter, and its outer peripheral surface presses the inner peripheral surface of the green compact 1. Therefore, the green compacts 1 ... Can not move relative to each other in any radial direction. Next, the green compacts 1 ... Are inserted into a sintering furnace and sintered for a predetermined time. Then, the tape 2 burns due to the temperature inside the furnace. Then, after heating for a predetermined time, it is taken out from the sintering furnace.

このような圧粉体の焼結方法においては、圧粉体1…を
焼結炉内に挿入する際に、圧粉体1…の内周面がテープ
2の外周面により押圧されているから、圧粉体1どうし
がずれることがない。したがって、圧粉体1…の落下に
よる割れや変形の発生を未然に防止することができる。
また、テープ2が焼結炉の炉内温度で焼失するから、焼
結により互いに付着した焼結体を容易に分離することが
できるとともに、金属製のコア部材を挿入した場合のよ
うに焼結時に圧粉体1…の割れや変形を発生させるよう
な強い外力は生じず、また、圧粉体1…の内径のばらつ
きに関わりなく良好な焼結品を得ることができる。
In such a green compact sintering method, the inner peripheral surface of the green compact 1 is pressed by the outer peripheral surface of the tape 2 when the green compact 1 is inserted into the sintering furnace. , The green compacts 1 are not displaced from each other. Therefore, it is possible to prevent cracking or deformation of the green compact 1 ...
Further, since the tape 2 is burnt at the temperature inside the sintering furnace, it is possible to easily separate the sinters adhered to each other by sintering, and to sinter like the case where a metal core member is inserted. At times, a strong external force that causes cracking or deformation of the green compact 1 does not occur, and a good sintered product can be obtained regardless of variations in the inner diameter of the green compact 1.

なお、上記実施例では、圧粉体1…の内周側にテープ2
を挿入するようにしているが、第2図に示すように、テ
ープ2を圧粉体1…の外周に巻き付けるとともに、その
両端部を互いに接着して環体3を構成してもよい。この
場合、圧粉体1…の回りにテープ2を巻き付けて支持し
ているので、搬送時において圧粉体1どうしのずれは生
じない。また、上記実施例ではボール紙製のテープ2を
用いているが、焼結炉の炉内温度で焼失するものであれ
ば、樹脂や布等のテープを用いてもよい。
In the above embodiment, the tape 2 is provided on the inner peripheral side of the green compact 1.
Although the tape 2 is inserted, the tape 2 may be wound around the outer periphery of the green compact 1 and the both ends thereof may be bonded to each other to form the ring body 3, as shown in FIG. In this case, since the tape 2 is wound around and supported by the green compacts 1 ..., The green compacts 1 are not displaced during transportation. Further, although the cardboard tape 2 is used in the above embodiments, a tape made of resin, cloth, or the like may be used as long as it can be burned down at the temperature in the sintering furnace.

[発明の効果] 以上説明したようにこの発明の圧粉体の焼結方法では、
圧粉体を焼結炉に挿入する前に、焼結炉の炉内温度で焼
失し得る材質からなり、かつ圧粉体の積上げ高さと同程
度の幅を有するテープを環状にして圧粉体の外周側また
は内周側に配置するから、後工程の作業に支障を来すこ
となく、積み重ねた圧粉体が互いにずれるのを防止する
ことができ、したがって、圧粉体の落下による割れや変
形を未然に防止することができるとともに、金属製のコ
ア部材を挿入した場合のように、焼結時に圧粉体の割れ
や変形を発生させるような外力は生じず、良好な焼結品
を得ることができるという効果が得られる。
[Effects of the Invention] As described above, in the method for sintering a green compact of the present invention,
Before inserting the green compact into the sintering furnace, a tape made of a material that can be burned down at the temperature inside the sintering furnace and having a width approximately equal to the stack height of the green compact is formed into an annular shape. Since it is arranged on the outer or inner peripheral side of the, it is possible to prevent the stacked green compacts from being displaced from each other without hindering the work of the subsequent process, and therefore, to prevent cracking due to the fall of the green compacts. Deformation can be prevented in advance, and an external force that causes cracking or deformation of the green compact during sintering, such as when inserting a metal core member, does not occur, and a good sintered product can be obtained. The effect that it can be obtained is obtained.

【図面の簡単な説明】 第1図は積み重ねられた圧粉体の内周側にテープを挿入
した状態を示す斜視図、第2図は第1図に示す実施例の
変更例を示す図であって、圧粉体の外周側にテープを環
装した状態を示す斜視図である。 1……圧粉体、 2……テープ。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a state where a tape is inserted on the inner peripheral side of stacked green compacts, and FIG. 2 is a view showing a modification of the embodiment shown in FIG. FIG. 3 is a perspective view showing a state in which a tape is wound around the outer periphery of the green compact. 1 ... green compact, 2 ... tape.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】リング状をなす圧粉体をその軸線方向に複
数積み重ねて焼結炉に挿入し、上記圧粉体を加熱して焼
結する圧粉体の焼結方法において、上記圧粉体を焼結炉
に挿入する前に、上記焼結炉の炉内温度で焼失し得る材
質からなり、かつ圧粉体の積上げ高さと同程度の幅を有
するテープを環状にして圧粉体の内周側に配置するとと
もに、テープを弛緩させて該テープにより圧粉体の内周
面を押圧した状態とし、その後、焼結炉で焼結すること
を特徴とする圧粉体の焼結方法。
1. A method for sintering a green compact, comprising stacking a plurality of ring-shaped green compacts in an axial direction, inserting the green compacts into a sintering furnace, and heating and sintering the green compact. Before the body is inserted into the sintering furnace, a tape made of a material that can be burned down at the temperature in the sintering furnace and having a width approximately the same as the stack height of the green compact is formed into an annular shape. A method for sintering a green compact, which is characterized in that it is arranged on the inner peripheral side, and the tape is relaxed so that the inner peripheral surface of the green compact is pressed by the tape, and then sintered in a sintering furnace. .
【請求項2】リング状をなす圧粉体をその軸線方向に複
数積み重ねて焼結炉に挿入し、上記圧粉体を加熱して焼
結する圧粉体の焼結方法において、上記圧粉体を焼結炉
に挿入する前に、上記焼結炉の炉内温度で焼失し得る材
質からなり、かつ圧粉体の積上げ高さと同程度の幅を有
するテープを環状にして圧粉体の外周側に巻き付けると
ともに、テープの両端部を互いに接着し、その後、焼結
炉で焼結することを特徴とする圧粉体の焼結方法。
2. A method for sintering a green compact, which comprises stacking a plurality of ring-shaped green compacts in an axial direction, inserting the green compacts into a sintering furnace, and heating and sintering the green compact. Before the body is inserted into the sintering furnace, a tape made of a material that can be burned down at the temperature in the sintering furnace and having a width approximately the same as the stack height of the green compact is formed into an annular shape. A method for sintering a green compact, which comprises winding the tape on the outer peripheral side, adhering both ends of the tape to each other, and then sintering in a sintering furnace.
JP61295231A 1986-12-11 1986-12-11 Sintering method of green compact Expired - Lifetime JPH0765081B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61295231A JPH0765081B2 (en) 1986-12-11 1986-12-11 Sintering method of green compact

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61295231A JPH0765081B2 (en) 1986-12-11 1986-12-11 Sintering method of green compact

Publications (2)

Publication Number Publication Date
JPS63149303A JPS63149303A (en) 1988-06-22
JPH0765081B2 true JPH0765081B2 (en) 1995-07-12

Family

ID=17817906

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61295231A Expired - Lifetime JPH0765081B2 (en) 1986-12-11 1986-12-11 Sintering method of green compact

Country Status (1)

Country Link
JP (1) JPH0765081B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007204326A (en) * 2006-02-02 2007-08-16 Catalysts & Chem Ind Co Ltd Drying method for flat plate ceramics molding

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52706A (en) * 1975-06-24 1977-01-06 Riken Corp Sintering method of piston rings
JPS5970701A (en) * 1982-10-15 1984-04-21 Toyota Motor Corp Sintering method of metallic powder molding

Also Published As

Publication number Publication date
JPS63149303A (en) 1988-06-22

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