JPH02228406A - Method and apparatus for degreasing of injection-molded parts - Google Patents
Method and apparatus for degreasing of injection-molded partsInfo
- Publication number
- JPH02228406A JPH02228406A JP5064889A JP5064889A JPH02228406A JP H02228406 A JPH02228406 A JP H02228406A JP 5064889 A JP5064889 A JP 5064889A JP 5064889 A JP5064889 A JP 5064889A JP H02228406 A JPH02228406 A JP H02228406A
- Authority
- JP
- Japan
- Prior art keywords
- degreasing
- gas
- processing table
- parts
- injection
- 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
- 238000005238 degreasing Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 239000003365 glass fiber Substances 0.000 claims description 2
- 239000010419 fine particle Substances 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 239000011230 binding agent Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 229910001111 Fine metal Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は金属粉末の射出成形工程における成形品の脱脂
方法および該方法を実施するのに用いられる射出成形部
品の脱脂装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for degreasing a molded article in a metal powder injection molding process and an apparatus for degreasing injection molded parts used to carry out the method.
(従来技術)
一般に金属粉末を射出成形法により成形し、機械部品等
を製造する工程で・は、成形品に含有したバインダを成
形後除去する脱脂工程を経る。脱脂の簡単な方法として
は、セラミック成形品と同様の大気雰囲気脱脂または雰
囲気ガス脱脂が採用されており、酸化を防止する必要が
ある材料については雰囲気ガスにN、ガス、Arガス、
H8ガス等が使用される。いずれの場合も製品は処理台
上に載置され、加熱、脱脂されるが、製品の処理台に接
する面は大気または雰囲気ガスに接触しないため、脱脂
されにくい、特にNオガス、Arガス等バインダと分解
反応を起さない雰囲気についてはその現象が顕著であり
、場合によってはパインダが溶融して製品が処理台に付
着するという不都合を生じる。(Prior Art) Generally, in the process of molding metal powder by injection molding to produce mechanical parts, etc., a degreasing process is performed to remove the binder contained in the molded product after molding. As a simple method for degreasing, atmospheric degreasing or atmospheric gas degreasing, which is similar to that used for ceramic molded products, is adopted. For materials that require prevention of oxidation, the atmospheric gas may include N, gas, Ar gas,
H8 gas or the like is used. In either case, the product is placed on a processing table, heated and degreased, but the surface of the product in contact with the processing table does not come into contact with the atmosphere or atmospheric gas, so it is difficult to degrease, especially binders such as NO gas and Ar gas. This phenomenon is noticeable in atmospheres that do not cause decomposition reactions, and in some cases, the binder may melt and the product may adhere to the processing table.
この不都合を解決する方法として、処理台上に金網を張
り、この上に載せたり、表面に凹凸のある部材を処理台
とし、製品の底面と処理台の間に雰囲気ガスが入り込む
ようにする試みがなされている。As a way to solve this problem, attempts have been made to place a wire mesh over the processing table and place it on top, or to use a member with an uneven surface as the processing table so that atmospheric gas can enter between the bottom of the product and the processing table. is being done.
(発明が解決しようとする課題)
上述したように成形製品の雰囲気脱脂処理において、製
品の底面に雰囲気ガスを接触させるために処理台に金網
や凹凸を設ける方法は、脱脂工程の途中で製品が軟化す
るため、製品を支持している金網の網目とか処理台の凹
凸部の形状が製品面に転写されてしまう欠点がある。逆
に製品面に転写されない程度のスムーズな表面を有する
処理台では、製品と処理台との間に雰囲気ガスが入り込
まず、脱脂むらを生じるといった問題があった。(Problem to be Solved by the Invention) As mentioned above, in the atmospheric degreasing treatment of molded products, the method of providing a wire mesh or unevenness on the processing table to bring the atmospheric gas into contact with the bottom of the product may cause the product to degrease during the degreasing process. Because it softens, it has the disadvantage that the shape of the mesh of the wire mesh supporting the product or the unevenness of the processing table is transferred onto the product surface. On the other hand, with a processing table that has a smooth surface that does not transfer onto the product surface, there is a problem that atmospheric gas does not enter between the product and the processing table, resulting in uneven degreasing.
(課題を解決するための手段)
そこで本発明は、製品面に処理台の載置面の形状が転写
されずに製品全面を脱脂雰囲気に接触させ、製品全体を
均一に脱脂することを目的とするものであって、具体的
には、射出成形部品を処理台上に載置し、大気または雰
囲気ガス中で加熱する射出成形部品の脱脂方法において
、大気または脱脂雰囲気ガスと同質の気体を前記処理台
の表面から噴出させ、該処理台と射出成形部品との接触
面に前記気体を導入しつつ加熱、脱脂するようにした。(Means for Solving the Problems) Therefore, the present invention aims to uniformly degrease the entire product by bringing the entire surface of the product into contact with a degreasing atmosphere without transferring the shape of the mounting surface of the processing table onto the product surface. Specifically, in a degreasing method for injection molded parts in which the injection molded part is placed on a processing table and heated in the atmosphere or atmospheric gas, a gas of the same quality as the atmosphere or the degreasing atmospheric gas is The gas was ejected from the surface of the processing table and heated and degreased while being introduced into the contact surface between the processing table and the injection molded part.
また上記方法を実施するための本発明による脱脂装置は
、多数の微細孔を有しかつ表面がなめらかになった処理
台と、前記処理台に設けられた気体導入管とを有し、前
記微細孔が前記処理台の表面に露出しかつ前記気体導入
管に連通しており、前記処理台の表面上に射出成形部品
が載置されるようにしたものである。Further, a degreasing apparatus according to the present invention for carrying out the above method includes a processing table having a large number of fine holes and a smooth surface, and a gas introduction pipe provided on the processing table, A hole is exposed on the surface of the processing table and communicates with the gas introduction pipe, and the injection molded part is placed on the surface of the processing table.
(実施例)
次に、本発明を実施例について図面を参照して説明する
。(Example) Next, an example of the present invention will be described with reference to the drawings.
第1図は本発明の実施例に係る脱脂装置の概略的な斜視
図である。処理台10は、表面が平坦でかつ気体流路と
なる連通空孔1aをもつ多孔体1と、多孔体1の外側部
を支持する外枠2と、外枠2を通して多孔体lの連通空
孔1aにつながる複数本の気体導入管3とを有している
。FIG. 1 is a schematic perspective view of a degreasing device according to an embodiment of the present invention. The processing table 10 includes a porous body 1 having a flat surface and communicating holes 1a serving as gas flow paths, an outer frame 2 that supports the outer side of the porous body 1, and a communicating hole of the porous body l through the outer frame 2. It has a plurality of gas introduction pipes 3 connected to the hole 1a.
多孔体1はその上面に射出成形品4(第2図参照)を載
せ得る大きさを有しており、また外枠2と協働して成形
品を脱脂加熱処理に供するのに耐え得る機械的、熱的強
度を有し、さらにその連通空孔1aは気体導入管3から
供給された脱脂雰囲気ガスを多孔体表面から噴出し得る
構造を有している。具体的には、脱脂すべき成形品の種
類、大きさにもよるが、例えば金属あるいはセラミック
の微粉末を焼成した多孔質材、金属細線やガラスファイ
バーの集積体、その他多数の微細孔を設けた金属あるい
はセラミックのブロック等が採用可能である。The porous body 1 has a size that allows an injection molded product 4 (see FIG. 2) to be placed on its upper surface, and a machine capable of working with the outer frame 2 to subject the molded product to degreasing heat treatment. In addition, the communicating holes 1a have a structure that allows the degreasing atmosphere gas supplied from the gas introduction pipe 3 to be ejected from the surface of the porous body. Specifically, it depends on the type and size of the molded product to be degreased, but examples include porous materials made of fired fine metal or ceramic powder, aggregates of fine metal wires and glass fibers, and other materials with many micropores. A metal or ceramic block, etc., can be used.
このような構成の処理台10を脱脂炉内に設置し、処理
台10の多孔体上面に成形品4を載せ、炉内を大気雰囲
気あるいはN8ガス、Arガス、H,ガス等の脱脂雰囲
気ガスで満たし、さらにこの炉内雰囲気と同じ気体を気
体導入管3から供給し、加熱処理する。気体導入管3か
ら送り込んだ空気あるいはガスは、多孔体l内を通って
その上面から噴出し、第2図のように成形品4の底面と
多孔体1との界面を経て炉内脱脂雰囲気へ放出される6
炉内部度の上昇止ともに成形品内部のバインダは炉内脱
脂雰囲気および多孔体表面からの噴出気体と反応して分
解し、ガス流となって除去される。この場合、バインダ
の分解反応は第3図のように成形品4のほぼ全面から内
部中心へと進行し、成形品全体の肉厚が均一に減少し、
短時間で完全な脱バインダ即ち脱脂がなされる。The processing table 10 having such a configuration is installed in a degreasing furnace, the molded product 4 is placed on the upper surface of the porous body of the processing table 10, and the inside of the furnace is exposed to air or a degreasing atmosphere gas such as N8 gas, Ar gas, H, gas, etc. Further, the same gas as the atmosphere inside the furnace is supplied from the gas introduction pipe 3, and heat treatment is performed. The air or gas sent from the gas introduction pipe 3 passes through the porous body 1 and is ejected from the top surface of the porous body 1, passes through the interface between the bottom surface of the molded product 4 and the porous body 1, and enters the degreasing atmosphere in the furnace, as shown in Fig. 2. released 6
When the temperature inside the furnace stops rising, the binder inside the molded product reacts with the degreasing atmosphere inside the furnace and the gas ejected from the surface of the porous body, decomposes, and is removed in the form of a gas flow. In this case, the decomposition reaction of the binder progresses from almost the entire surface of the molded product 4 to the center of the interior, as shown in FIG. 3, and the thickness of the entire molded product decreases uniformly.
Complete debinding or degreasing is achieved in a short time.
第4図は従来の処理台を用いた場合の成形品6の脱脂反
応状態を示す断面図であるが、この場合は中実の処理台
7上に成形品6を載せて脱脂処理しているので、同図の
ように大気または雰囲気ガスにさらされる成形品6の上
側から脱脂が進行し、脱脂速度も遅(なるとともに、処
理台7に接する成形品6の底部では雰囲気ガスに触れず
、この部分に不完全脱脂部8が残ってしまう、この傾向
ば大気中での脱脂よりNtガス、Arガス等の雰囲気ガ
ス脱脂において顕著である。成形品底面を雰囲気ガスに
接触させるために処理台7に凹凸を形成すると、この凹
凸紋様が成形品に転写されてしまう。FIG. 4 is a cross-sectional view showing the degreasing reaction state of the molded product 6 when a conventional processing table is used. In this case, the molded product 6 is placed on a solid processing table 7 and degreased. Therefore, as shown in the figure, degreasing progresses from the upper side of the molded product 6 that is exposed to the atmosphere or atmospheric gas, and the degreasing speed is slow (at the same time, the bottom of the molded product 6 that is in contact with the processing table 7 does not come into contact with the atmospheric gas, This tendency to leave an incompletely degreased part 8 in this area is more noticeable in atmospheric gas degreasing such as Nt gas or Ar gas than in the atmosphere.In order to bring the bottom of the molded product into contact with the atmospheric gas, If unevenness is formed on 7, this uneven pattern will be transferred to the molded product.
前述の如く本発明においては、成形品の支持界面に多孔
体1の連通空孔を介して気体がもたらされるので、多孔
体lは成形品への表面転写が生じない程度のスムーズな
表面性状に形成することができる。第5図(a)、■)
はいずれも多孔体表面性状として不適切な例を示した拡
大断面図である。同図(a)は多孔体5の表面自体に大
きな凹凸部9を有する場合、同図(b)は多孔体5の表
面は平坦であるものの、連通空孔の多孔体表面に露出し
た開口部5aの口径が大きく、この開口部5aの形状が
成形品4に転写される例である。このような表面転写が
生じないように多孔体表面を加工処理するか開口部の口
径が適切なものを選定して用いる。なお第1図で多孔体
1に気体を供給するための気体導入管30本敗および設
置位置は、処理台10の大きさ、形状、その地条孔体の
空孔率、圧損等により決定される。As mentioned above, in the present invention, gas is brought to the supporting interface of the molded product through the communicating pores of the porous body 1, so that the porous body 1 has a smooth surface to the extent that no surface transfer occurs to the molded product. can be formed. Figure 5 (a), ■)
Both are enlarged cross-sectional views showing examples of inappropriate porous material surface properties. The figure (a) shows a case where the surface of the porous body 5 itself has large irregularities 9, and the figure (b) shows the case where the surface of the porous body 5 is flat, but the openings of communicating pores are exposed on the surface of the porous body. This is an example in which the diameter of the opening 5a is large and the shape of the opening 5a is transferred to the molded product 4. In order to prevent such surface transfer, the surface of the porous body is processed or a porous body with an appropriate opening diameter is selected and used. In FIG. 1, the 30 gas introduction pipes for supplying gas to the porous body 1 and their installation positions are determined by the size and shape of the processing table 10, the porosity of the striated porous body, pressure drop, etc. Ru.
(発明の効果)
以上説明したように本発明によれば、成形品を表面のス
ムーズな多孔体上に載置し、該多孔体を通して脱脂雰囲
気と同じ気体を成形品載置面に導(ようにしたので、成
形品の多面全体から内部へと脱脂が進行し、これによっ
て成形品底部での脱脂むらが起らず、短時間で完全な脱
脂処理が行える。成形品と多孔体との接触面に雰囲気膜
ができることから、脱脂処理中にバインダが溶融して固
着するという不具合も生じない。(Effects of the Invention) As explained above, according to the present invention, a molded article is placed on a porous body with a smooth surface, and the same gas as the degreasing atmosphere is introduced to the molded article placement surface through the porous body. As a result, degreasing progresses from all sides of the molded product to the inside, which prevents uneven degreasing from occurring at the bottom of the molded product, allowing for complete degreasing in a short time.Contact between the molded product and the porous body Since an atmospheric film is formed on the surface, there is no problem of the binder melting and sticking during the degreasing process.
第1図は本発明の実施例に係る脱脂装置の処理台の斜視
図、第2図は本発明に係る多孔体の成形品載置状態にお
ける縦断面図、第3図は本発明の実施例による成形品の
脱脂反応状態を示す縦断面図、第4図は従来の処理台に
よる脱脂反応状態を示す縦断面図、第5図(a)、(b
)は本発明に適用するのに不向きな多孔体の例を示す拡
大断面図である。
1、 5・・・多孔体、2・・・外枠、3・・・気体導
入管、4.6・・・成形品、7.10・・・処理台、8
・・・不完全脱脂部、9・・・凹凸部。
第1図
復代理人 弁理士
染用利吉
第2図FIG. 1 is a perspective view of a processing table of a degreasing apparatus according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of a porous body according to the present invention in a state in which a molded product is placed, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a vertical cross-sectional view showing the degreasing reaction state of a molded product using a conventional processing table, and FIGS. 5(a) and (b)
) is an enlarged sectional view showing an example of a porous body unsuitable for application to the present invention. 1, 5... Porous body, 2... Outer frame, 3... Gas introduction pipe, 4.6... Molded product, 7.10... Processing table, 8
... Incompletely degreased part, 9... Uneven part. Figure 1 Sub-Agent Patent Attorney Rikichi Someyo Figure 2
Claims (3)
雰囲気ガス中で加熱する射出成形部品の脱脂方法におい
て、大気または脱脂雰囲気ガスと同質の気体を前記処理
台の表面から噴出させ、該処理台と射出成形部品との接
触面に前記気体を導入しつつ加熱、脱脂することを特徴
とする射出成形部品の脱脂方法。(1) In a degreasing method for injection molded parts in which the injection molded part is placed on a processing table and heated in the atmosphere or atmospheric gas, a gas having the same quality as the atmosphere or the degreasing atmospheric gas is ejected from the surface of the processing table. A method for degreasing an injection molded part, which comprises heating and degreasing the gas while introducing the gas into the contact surface between the processing table and the injection molded part.
た処理台と、前記処理台に設けられた気体導入管とを有
し、前記微細孔が前記処理台の表面に露出しかつ前記気
体導入管に連通しており、前記処理台の表面上に射出成
形部品が載置されることを特徴とする射出成形部品の脱
脂装置。(2) A processing table having a large number of micropores and a smooth surface, and a gas introduction pipe provided on the processing table, wherein the micropores are exposed on the surface of the processing table and A degreasing device for injection molded parts, which communicates with the gas introduction pipe, and wherein the injection molded parts are placed on the surface of the processing table.
スファイバの焼成体で形成されることを特徴とする請求
項第2項記載の射出成形部品の脱脂装置。(3) The degreasing apparatus for injection molded parts according to claim 2, wherein the processing table is formed of a fired body of metal, ceramic, or glass fiber.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5064889A JPH02228406A (en) | 1989-03-02 | 1989-03-02 | Method and apparatus for degreasing of injection-molded parts |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5064889A JPH02228406A (en) | 1989-03-02 | 1989-03-02 | Method and apparatus for degreasing of injection-molded parts |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02228406A true JPH02228406A (en) | 1990-09-11 |
Family
ID=12864760
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5064889A Pending JPH02228406A (en) | 1989-03-02 | 1989-03-02 | Method and apparatus for degreasing of injection-molded parts |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02228406A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2398539A (en) * | 2003-02-18 | 2004-08-25 | Howmet Res Corp | Manufacturing a ceramic setter |
CN103464755A (en) * | 2013-08-26 | 2013-12-25 | 苏州米莫金属科技有限公司 | Degreasing subplate for metal powder injection molding |
-
1989
- 1989-03-02 JP JP5064889A patent/JPH02228406A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2398539A (en) * | 2003-02-18 | 2004-08-25 | Howmet Res Corp | Manufacturing a ceramic setter |
GB2398539B (en) * | 2003-02-18 | 2006-05-17 | Howmet Res Corp | Method for making ceramic setter |
CN103464755A (en) * | 2013-08-26 | 2013-12-25 | 苏州米莫金属科技有限公司 | Degreasing subplate for metal powder injection molding |
CN103464755B (en) * | 2013-08-26 | 2015-11-04 | 苏州米莫金属科技有限公司 | Metal powder injection molding degreasing backing plate |
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