JPH0257614A - Degreasing method - Google Patents
Degreasing methodInfo
- Publication number
- JPH0257614A JPH0257614A JP20671188A JP20671188A JPH0257614A JP H0257614 A JPH0257614 A JP H0257614A JP 20671188 A JP20671188 A JP 20671188A JP 20671188 A JP20671188 A JP 20671188A JP H0257614 A JPH0257614 A JP H0257614A
- Authority
- JP
- Japan
- Prior art keywords
- degreasing
- binder
- atmosphere
- formed product
- degreased
- 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 36
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000011230 binding agent Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 25
- 239000012298 atmosphere Substances 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 7
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 6
- 238000000354 decomposition reaction Methods 0.000 claims description 16
- 238000001746 injection moulding Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 9
- 230000001590 oxidative effect Effects 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 5
- 238000004898 kneading Methods 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 12
- 239000000203 mixture Substances 0.000 abstract description 6
- 239000007769 metal material Substances 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 abstract description 2
- 239000012778 molding material Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 22
- 239000001993 wax Substances 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- FLKPEMZONWLCSK-UHFFFAOYSA-N diethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(=O)OCC FLKPEMZONWLCSK-UHFFFAOYSA-N 0.000 description 4
- 239000004413 injection moulding compound Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 2
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- DSSYKIVIOFKYAU-XCBNKYQSSA-N (R)-camphor Chemical compound C1C[C@@]2(C)C(=O)C[C@@H]1C2(C)C DSSYKIVIOFKYAU-XCBNKYQSSA-N 0.000 description 1
- WCVOGSZTONGSQY-UHFFFAOYSA-N 2,4,6-trichloroanisole Chemical compound COC1=C(Cl)C=C(Cl)C=C1Cl WCVOGSZTONGSQY-UHFFFAOYSA-N 0.000 description 1
- 241000723346 Cinnamomum camphora Species 0.000 description 1
- 239000004803 Di-2ethylhexylphthalate Substances 0.000 description 1
- 229910017061 Fe Co Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 235000013871 bee wax Nutrition 0.000 description 1
- 239000012166 beeswax Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229960000846 camphor Drugs 0.000 description 1
- 229930008380 camphor Natural products 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000004200 microcrystalline wax Substances 0.000 description 1
- 235000019808 microcrystalline wax Nutrition 0.000 description 1
- 239000012170 montan wax Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は焼結金属材料の製造方法に関し、詳しくは、金
属粉末射出成形体の脱脂方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing a sintered metal material, and more particularly to a method for degreasing a metal powder injection molded body.
〈従来の技術〉
射出成形を利用した焼結材料の製造方法は、複雑な形状
をした金属部品の製造方法として有望視されている。
全工程中、脱脂工程においては、先行特許（特開昭５８
−１２６９０１）にみるように、成形体に対して充分な
量のガスを送風することが多い。 極端な場合は、炉内
にファンを設けて、成形体周囲のガスの排除していた。<Prior Art> A method for manufacturing sintered materials using injection molding is seen as a promising method for manufacturing metal parts with complex shapes.
During the entire process, in the degreasing process, the prior patent (Japanese Patent Laid-Open No. 58
-126901), a sufficient amount of gas is often blown onto the molded body. In extreme cases, a fan was installed in the furnace to remove the gas around the molded product.
〈発明が解決しようとする課題〉
しかし、前述のような手段を用いる場合、成形体の周囲
において、温度および表面環境において不均一が生じる
。 その結果、脱脂体に欠陥が生じる危険性が高い。<Problems to be Solved by the Invention> However, when the above-mentioned means are used, non-uniformity occurs in temperature and surface environment around the molded article. As a result, there is a high risk that defects will occur in the degreased body.
そこで本発明は上記課題を解決し、射出成形体の脱脂時
に起こる欠陥の発生率の少ない脱脂方法を提供しようと
するものである。Therefore, the present invention aims to solve the above problems and provide a degreasing method that reduces the incidence of defects that occur during degreasing of injection molded articles.
く課題を解決するための手段〉
本発明者らは、射出成形などによる微粉末を原料とする
焼結金属材料の製造に関して、脱脂時の欠陥発生につい
て、詳細な実験を行なうことによって本発明を為すに至
った。Means for Solving the Problems> The present inventors have developed the present invention by conducting detailed experiments regarding the occurrence of defects during degreasing in the production of sintered metal materials using fine powder as a raw material by injection molding, etc. I ended up doing it.
すなわち、本発明は、金属粉末を主体とする原料粉末と
有機バインダとを体積比にして５０ ： ５０〜６０二
４０の比率で加熱混練して成形用原料を得る工程、
成形用原料を射出成形して成形体を得る工程、
加熱雰囲気中で有機バインダの一部または全部を除去し
て脱脂体を得る工程、
前記脱脂体を加熱雰囲気中で焼結して焼結体を得る工程
より構成される金属焼結材料の製造方法である。That is, the present invention includes a step of heating and kneading a raw material powder mainly composed of metal powder and an organic binder at a volume ratio of 50:50 to 60:240 to obtain a molding raw material, and injection molding the molding raw material. a step of removing part or all of the organic binder in a heated atmosphere to obtain a degreased body, and a step of sintering the degreased body in a heated atmosphere to obtain a sintered body. This is a method for producing metal sintered materials.
前記脱脂体を得る工程を、非酸化性雰囲気の加熱炉内に
、成形体を入れた通気性に乏しい容器を挿入し、成形体
の周囲を常に有機バインダの分解ガスで飽和した雰囲気
下で行うことを特徴とする脱脂方法を提供する。The step of obtaining the degreased body is performed by inserting a container containing the molded body with poor ventilation into a heating furnace with a non-oxidizing atmosphere, and in an atmosphere where the area around the molded body is always saturated with the decomposition gas of the organic binder. To provide a degreasing method characterized by:
以下、本発明について詳細に説明する。The present invention will be explained in detail below.
本発明において、脱脂雰囲気は非酸化性７囲気である。In the present invention, the degreasing atmosphere is a non-oxidizing atmosphere.
空気等の酸化性雰囲気で処理すると、空気中の酸素が有
機バインダの分解開始反応に寄与するため、酸素濃度の
変動や部品形状およびサイズが変る（酸素の拡散距離が
変る）ことによって分解挙動が変る。 これらバインダ
の分解に影響を及ぼす要因が増加することによって、製
造バラツキが増加したり、製造管理項目を増やす必要が
あり、製造上好ましくない。 また、酸素の存在は、金
属粉末の酸化反応も引き起こすため、バインダ分解反応
と同様に製造上の問題点が増加するため、好ましくない
。 したがって、脱脂雰囲気は、成形体を構成する金属
粉末およびバインダとなんら反応しない非酸化性７囲気
である必要がある。When processing in an oxidizing atmosphere such as air, the oxygen in the air contributes to the decomposition initiation reaction of the organic binder, so the decomposition behavior may be affected by fluctuations in oxygen concentration or changes in part shape and size (changes in oxygen diffusion distance). Change. As the factors that affect the decomposition of the binder increase, manufacturing variations increase and manufacturing control items need to be increased, which is unfavorable in terms of manufacturing. Further, the presence of oxygen also causes an oxidation reaction of the metal powder, which increases production problems similar to the binder decomposition reaction, and is therefore undesirable. Therefore, the degreasing atmosphere needs to be a non-oxidizing atmosphere that does not react in any way with the metal powder and binder constituting the compact.
また、成形体は通気性の乏しい容器に収め、加熱炉内に
挿入する必要がある。 これは、脱脂時の成形体周囲の
分解ガス濃度および温度を均一にするためである。 分
解ガス濃度および温度はいずれもバインダの分解速度を
大きく左右する要因であるため、これらの要因に不均一
がある場合、脱脂体に欠陥が生じる。 たとえば、支持
板等の上に置かれた成形体に激しく送風をした場合が相
当する。 この場合、支持板と接触しない部分にはガス
が当るが、接触面にはガスが当らない。 送風ガスが当
る部分においては、送風ガスとの伝熱によって温度が上
がり、また、その周囲のバインダ分解ガス濃度が低いた
めに、分解が促進される。 一方、送風ガスが当らない
部分においては、送風ガスによる加熱も送風ガスによる
バインダ分解ガス成分の除去も行われないため、分解は
促進されない。 その結果、成形体の各部位において、
分解が不均一におこり、脱脂体のワレが生じる危険性が
高まる。Further, the molded body must be placed in a container with poor air permeability and inserted into a heating furnace. This is to make the decomposed gas concentration and temperature around the molded body uniform during degreasing. Since both the decomposition gas concentration and temperature are factors that greatly influence the decomposition rate of the binder, if there is non-uniformity in these factors, defects will occur in the degreased body. For example, this occurs when a molded article placed on a support plate or the like is vigorously blown with air. In this case, the gas hits the parts that do not come into contact with the support plate, but the gas does not hit the contact surfaces. In the area that is hit by the blast gas, the temperature rises due to heat transfer with the blast gas, and since the concentration of binder decomposition gas around the area is low, decomposition is promoted. On the other hand, in areas that are not hit by the blast gas, neither heating by the blast gas nor removal of binder decomposition gas components by the blast gas is performed, so decomposition is not promoted. As a result, in each part of the molded body,
Decomposition occurs unevenly, increasing the risk of cracking of the degreased body.
一方、本発明においては、容器内への雰囲気ガスの積極
的な導入は行なわないので、以上のような成形体中の部
位による不均一はない。On the other hand, in the present invention, since atmospheric gas is not actively introduced into the container, there is no non-uniformity depending on the region in the molded body as described above.
また、容器内に飽和した分解ガス成分は、徐々に容器外
へ逃げるため、この逃げたガス成分に相当する量の分解
がすすむ。 このように反応は、平衡状態を保ちながら
進行するため、脱脂欠陥の生じる危険性は低い。Further, since the decomposed gas components saturated in the container gradually escape to the outside of the container, decomposition proceeds in an amount corresponding to the escaped gas components. In this way, the reaction proceeds while maintaining an equilibrium state, so the risk of degreasing defects occurring is low.
また、温度の上昇につれて、飽和蒸気圧は上昇するため
、分解反応が停止する心配もない。Furthermore, as the temperature rises, the saturated vapor pressure increases, so there is no fear that the decomposition reaction will stop.
すなわち、分解反応は高温側にシフトするたけで、脱脂
速度が極端に低下することもない。In other words, the decomposition reaction is simply shifted to the higher temperature side, and the degreasing rate does not drop significantly.
以上によってはじめて、脱脂欠陥の少ない脱脂が行なえ
る。Only by doing the above can degreasing be performed with fewer degreasing defects.
通気性を抑える方法としては、その一部に多孔質の通気
口を持つ金属容器などによって具体的には、容器の開口
部にＡｌ１，０５等の不活性な粉末を詰めたり、開口部
に通気性レンガ等を用いることによフて行なうことがで
きる。Examples of ways to reduce air permeability include using a metal container with a porous ventilation hole in a part of the container, or filling the opening of the container with inert powder such as Al1,05. This can be done by using bricks or the like.
本発明の脱脂方法を用いた金属焼結材料の製造に関し、
脱脂前後の工程は通常の公知方法が利用できる。Regarding the production of metal sintered materials using the degreasing method of the present invention,
Conventional known methods can be used for the steps before and after degreasing.
まず、本発明に使用する粉末は、アトマイズ法、還元法
、カルボニル法、粉砕法によって得られる合金あるいは
単体金属であり、必要に応じて、これらの粉末を分級、
混合することによって用意できる。 ただし、還元法、
カルボニル法、粉砕法によって製造しつる粉末組成はか
なり限定されるため、アトマイズ法が応用範囲が広い。First, the powder used in the present invention is an alloy or a single metal obtained by an atomization method, a reduction method, a carbonyl method, or a pulverization method, and if necessary, these powders are classified,
It can be prepared by mixing. However, reduction method,
Since the powder composition produced by the carbonyl method and the pulverization method is quite limited, the atomization method has a wide range of applications.
また、これら粉末の平均粒径は２０μｍ以下のものが使
用でき、７〜１４μｍ程度のものが、密度が高いこと等
、優れた焼結体特性が得られる利点があるため好ましい
。Further, the average particle diameter of these powders can be 20 μm or less, and powders of about 7 to 14 μm are preferred because they have the advantage of providing excellent sintered properties such as high density.
適用できる組成系は、ステンレス、純鉄、Ｆｅ−Ｎｉ、
Ｆｅ−５ｉ、Ｆｅ−Ｃｏ等の構造材料あるいは磁性材料
用などの広範囲にわたって適用できる。Applicable composition systems include stainless steel, pure iron, Fe-Ni,
It can be applied to a wide range of materials such as structural materials such as Fe-5i and Fe-Co, and magnetic materials.
成形体を射出成形にて作製するには、好ましくは平均粒
径が２０μｍ以下の、本発明の射出成形用粉末を、まず
成形助剤としてのバインダと混合・混練し、射出成形用
コンパウンドを調整する。To produce a molded object by injection molding, the injection molding powder of the present invention, preferably having an average particle size of 20 μm or less, is first mixed and kneaded with a binder as a molding aid to prepare an injection molding compound. do.
適用可能なバインダは、熱可塑性樹脂類、ワックス類、
あるいはその混合物を主体とする公知のバインダはいず
れも適用可能であり、また必要に応じて可塑剤、潤滑剤
、脱脂促進剤等を添加してもよい。Applicable binders include thermoplastic resins, waxes,
Alternatively, any known binder containing a mixture thereof may be used, and a plasticizer, lubricant, degreasing accelerator, etc. may be added as necessary.
熱可塑性樹脂としては、アクリル系、ボリエ。Thermoplastic resins include acrylic and Bolier.
チレン系、ポリプロピレン系およびポリスチレン系等の
一種、あるいは二種以上を混合して用いることができる
。One type of tyrene type, polypropylene type, polystyrene type, etc., or a mixture of two or more types can be used.
ワックス類としては密ろう、木ろう、モンタンワックス
等の天然ろう、低分子ポリエチレン、ミクロクリスタリ
ンワックス、パラフィンワックス等の合成ろう等の一種
あるいは二種以上を混合して用いることができる、
可塑剤は、バインダの主成分により適宜選択すればよく
、フタル酸ジー２−エチルヘキシル（ＤＯＰ）、フタル
酸ジエチル（ＤＥＰ）、フタル酸ジ−ｎ−ブチル（ＤＨ
Ｐ）等が例示できる。As waxes, one or a mixture of two or more of natural waxes such as beeswax, wood wax, and montan wax, and synthetic waxes such as low-molecular polyethylene, microcrystalline wax, and paraffin wax can be used. may be selected as appropriate depending on the main components of the binder, such as di-2-ethylhexyl phthalate (DOP), diethyl phthalate (DEP), di-n-butyl phthalate (DH
P) etc. can be exemplified.
潤滑剤としては、高級脂肪酸、脂肪酸アミド、脂肪酸エ
ステル等が適用可能であり、場合によってはワックス類
を潤滑剤として兼用してもよい。As the lubricant, higher fatty acids, fatty acid amides, fatty acid esters, etc. can be used, and in some cases, waxes may also be used as the lubricant.
また、必要に応じ、脱脂促進剤として樟脳等の昇華性物
質を添加してもよい。Further, if necessary, a sublimable substance such as camphor may be added as a degreasing accelerator.
なお、このようなバインダと原料粉末との混合比は、通
常５０：５０〜４０ ： ６０ｖｏ１％程度である。The mixing ratio of such binder and raw material powder is usually about 50:50 to 40:60 vol.
原料粉末とバインダとの混練方法は特に制限はなく、加
圧ニーダ、パンベリ・−ミキサー２軸押出し機等の各種
のニーダ等によれはよい。The method of kneading the raw material powder and the binder is not particularly limited, and various kneaders such as a pressure kneader, a Panberry mixer twin-screw extruder, etc. may be used.
このようにして調製した射出成形用コンパウンドけ、必
要に応じペレダイザー、粉砕器等を用いて造粒を行ない
、ベレットと１ノでもよい。The injection molding compound thus prepared may be granulated using a pelletizer, a pulverizer, etc., if necessary, to form pellets.
次いで、得られた射出成形用コンパウンドを射出成形し
て成形体を作製する。Next, the obtained injection molding compound is injection molded to produce a molded article.
射出成形は、通常のプラスチック用射出成形機５あるい
は最近市販されるようになったセラミンク用、金属粉末
用射出成形機等、通常の射出成形に用いられる射出成形
機を用いて行なえばよい。Injection molding may be carried out using an injection molding machine used for normal injection molding, such as a normal injection molding machine 5 for plastics or an injection molding machine for ceramics or metal powder that has recently become commercially available.
この際において、射出圧力は通常５００〜２５００ ｋ
ｇｆ／ｃ＋ｎ’程度、温度は１００〜１８０℃矛呈度で
ある。At this time, the injection pressure is usually 500 to 2500 k
gf/c+n', and the temperature is 100 to 180°C.
最後に、得られた成形体の脱脂処理を行なう。Finally, the obtained molded body is subjected to a degreasing treatment.
本発明の金属焼結体の製造方法においては、脱脂処理は
非酸化性雰囲気中、好ましくは窒素雰囲気、アルゴン雰
囲気あるいはこれらの混合雰囲気にて行なわれる。 Ｎ
２などの還元性カスも使用可能であるが、爆発性を有し
ており、取扱いに注意を要すること、加熱炉価格が高く
なる点で劣る。 また、必要に応じこれらの雰囲気圧力
を加圧もしくは減圧してもよいのは公知の通りである。In the method for producing a metal sintered body of the present invention, the degreasing treatment is performed in a non-oxidizing atmosphere, preferably a nitrogen atmosphere, an argon atmosphere, or a mixed atmosphere thereof. N
Reducing scum such as No. 2 can also be used, but it is inferior in that it is explosive, requires careful handling, and increases the cost of the heating furnace. It is also known that the atmospheric pressure may be increased or decreased as necessary.
脱脂処理の処理温度はｍａｘ４５０〜６５０℃程度、ま
た保持時間はＯ〜６ｈｒ程度である。 なお、この時の
昇温速度を速くしすぎると、得られた成形体に割れや膨
れが生じるので、５℃／ｈｒ〜２０℃／ ｈ ｒ程度で
一定速度で昇温するのが好ましい。The processing temperature of the degreasing treatment is max. about 450 to 650°C, and the holding time is about 0 to 6 hr. Note that if the heating rate at this time is too high, cracks or blisters will occur in the obtained molded body, so it is preferable to raise the temperature at a constant rate of about 5° C./hr to 20° C./hr.
本発明においては、このように射出成形にて得られた脱
脂済みの成形体を焼結して金属焼結体を製造する。In the present invention, a metal sintered body is manufactured by sintering the degreased molded body thus obtained by injection molding.
前記脱脂後、前記金属粉末がステンレスの場合には、１
０−’〜１０−’Ｔ ｏ ｒ ｒ中、１０５０〜１３０
０℃、０５〜４時間保持した後、アルゴン、窒素等の不
活性ガスを導入し、１２００〜１３７０℃、０．５〜２
時間保持して焼結するとよい。 また、他のＦｅ、Ｆｅ
−Ｎｉ系、Ｆｅ−Ｃ０系などの酸化性の低い金属のみを
用いた場合には、水素ガス等の還元性ガス中８００〜１
３００℃、０．５〜４時間保持して焼結するのがよい。After the degreasing, if the metal powder is stainless steel, 1
0-'~10-'T o r r, 1050~130
After holding at 0°C for 0.5 to 4 hours, inert gas such as argon or nitrogen was introduced, and the temperature was maintained at 1200 to 1370°C for 0.5 to 2 hours.
It is best to hold it for a while and sinter it. In addition, other Fe, Fe
- When using only low oxidizing metals such as Ni-based or Fe-C0-based, 800 to 1
Sintering is preferably carried out at 300°C for 0.5 to 4 hours.
Ｆｅ−３ｉ等の酸化性の高い金属を焼結する場合は、ス
テンレスと同様の方法で焼結する。When sintering a highly oxidizable metal such as Fe-3i, it is sintered in the same manner as stainless steel.
これらの工程を経ることによフて、本発明は優れた金属
焼結体を得ることができる。By going through these steps, the present invention can obtain an excellent metal sintered body.
〈実施例〉 以下、実施例に基づいて本発明を具体的に説明する。<Example> Hereinafter, the present invention will be specifically explained based on Examples.
（実施例１）
第１表に示す粉末を用意した。 その平均粒径を同表に
付記した。 これらの粉末にそれぞれバインダを添加し
、加圧ニーダによって混錬したのち、粉砕して射出成形
用コンパウンドを準備した。 射出成形機によって、４
０Ｘ１０Ｘ２ｍｍの直方体試験片を成形した。 射出成
形体は、第１表に示した窒素またはアルゴン中、＋５℃
／ｈの速度で６５０℃まで昇温の後、３０分保持して脱
脂処理を施した。 焼結は、ステンレスについてはＱ、
０ＯＩＴｏｒｒ中、１１５０℃で９０分保持した後、１
気圧のＡｒガスを導入して１３５０℃で２時間保持して
行なった。 また、Ｆａ−Ｎｉについては、水素中１
２５０℃で２時間保持して行なった。(Example 1) Powders shown in Table 1 were prepared. The average particle size is added to the same table. A binder was added to each of these powders, kneaded using a pressure kneader, and then ground to prepare an injection molding compound. By injection molding machine, 4
A rectangular parallelepiped test piece measuring 0x10x2 mm was molded. Injection molded bodies were heated at +5°C in nitrogen or argon as shown in Table 1.
The temperature was raised to 650° C. at a rate of 300° C./h, and the temperature was maintained for 30 minutes to perform a degreasing treatment. Regarding sintering, Q about stainless steel.
After holding at 1150°C for 90 minutes in 0OITorr, 1
The test was carried out by introducing Ar gas at atmospheric pressure and maintaining the temperature at 1350° C. for 2 hours. In addition, for Fa-Ni, 1 in hydrogen
The temperature was maintained at 250°C for 2 hours.
また、上記脱脂においては、下記（ａ）（ｂ）、（Ｃ）
の方法によって行なった。In addition, in the above degreasing, the following (a), (b), (C)
This was done using the method.
発明例（ａ）の脱脂工程を第１図に示す。The degreasing process of invention example (a) is shown in FIG.
第１図は、脱脂、焼結しようとする成形体１を５ＵＳ３
０４製容器３内にいれ、さらに炉心管４の中に前記容器
３ごと載置する。 そして前記炉心管４内に、Ａｒまた
はＮ２ガスを常に送り込む。Figure 1 shows a molded body 1 to be degreased and sintered.
The container 3 is placed in a container 3 made of No. 04, and then placed together with the container 3 in a furnace tube 4. Then, Ar or N2 gas is constantly fed into the furnace core tube 4.
この時、成形体１が、直接ＡｒまたはＮ２ガス６の送風
に触れないように、そして、成形体１の周囲は常に有機
バインダの分解ガスで飽和した雰囲気とするために、前
記容器３の開口部にアルミナ粉７を詰める。At this time, the container 3 is opened so that the molded body 1 does not come into direct contact with the blast of Ar or N2 gas 6, and the atmosphere around the molded body 1 is always saturated with the decomposed gas of the organic binder. Fill the section with alumina powder 7.
そして、この状態で、ヒータ５を用い、前述した方法で
昇温、脱脂を行なった。Then, in this state, using the heater 5, the temperature was raised and degreased using the method described above.
また、比較例（ｂ）については、第２図に示すように、
前記５ＵＳ３０４′＃！容器３のかわりに５ＵＳ３０４
製板２を用いて脱脂を行なった。In addition, for comparative example (b), as shown in FIG.
Said 5US304'#! 5US304 instead of container 3
Degreasing was performed using board 2.
そして比較例（Ｃ）については、第３図に示すように、
５ＵＳ３０４製板２を用い、炉心管４内の雰囲気を送風
ファン８を用いて攪拌しながら、前記同様に脱脂を行な
った。As for comparative example (C), as shown in Fig. 3,
Degreasing was carried out in the same manner as described above, using the 5US304 plate 2 and stirring the atmosphere inside the furnace core tube 4 using the blower fan 8.
脱脂は各水準について、１ｏ本の成形体を使用し、その
欠陥の有無を目視によって調べた。For each level of degreasing, 10 molded products were used, and the presence or absence of defects was visually inspected.
脱脂欠陥率および焼結体特性を第１表中に付記した。The degreasing defect rate and sintered body properties are added in Table 1.
第１表より、脱脂時の欠陥発生率は本発明において最も
低い。From Table 1, the defect occurrence rate during degreasing is the lowest in the present invention.
また、得られた焼結体の特性も、密度比およびＣ１０量
において健全なものであった。Furthermore, the properties of the obtained sintered body were also sound in terms of density ratio and C10 content.
〈発明の効果〉
本発明によって、脱脂時における欠陥の発生率を低減で
きるようになった。<Effects of the Invention> According to the present invention, it has become possible to reduce the incidence of defects during degreasing.
第１図は、本発明における脱脂方法の一例を示す概路線
図である。
第２図および第３図は、比較例として従来の脱脂方法の
一例を示す概路線図である。
５・・・ヒータ、
６・・・ＡｒあるいはＮ２
７・・・アルミナ粉、・
８・・・送風ファン、
−・・・ガスの流れ方向FIG. 1 is a schematic diagram showing an example of the degreasing method according to the present invention. FIGS. 2 and 3 are schematic diagrams showing an example of a conventional degreasing method as a comparative example. 5...Heater, 6...Ar or N2 7...Alumina powder, 8...Blower fan, -...Gas flow direction
Claims (1)
を体積比にして５０：５０〜６０：４０の比率で加熱混
練して成形用原料を得る工程、 前記成形用原料を射出成形して成形体を得る工程、 加熱雰囲気中で有機バインダの一部または全部を除去し
て脱脂体を得る工程、 前記脱脂体を加熱雰囲気中で焼結して焼結体を得る工程
より構成される金属焼結材料の製造方法であって、 前記脱脂体を得る工程を、非酸化性雰囲気で充たされた
加熱炉内に、成形体を入れた通気性に乏しい容器を挿入
し、成形体の周囲を常に有機バインダの分解ガスで飽和
した雰囲気下で行うことを特徴とする脱脂方法。(1) A step of heating and kneading a raw material powder mainly consisting of metal powder and an organic binder at a volume ratio of 50:50 to 60:40 to obtain a molding raw material, and injection molding the molding raw material. A metal comprising the following steps: obtaining a molded body, removing part or all of the organic binder in a heated atmosphere to obtain a degreased body, and sintering the degreased body in a heated atmosphere to obtain a sintered body. A method for producing a sintered material, wherein the step of obtaining the degreased body is performed by inserting a container with poor air permeability containing the molded body into a heating furnace filled with a non-oxidizing atmosphere, and removing air around the molded body. A degreasing method characterized in that this is always carried out in an atmosphere saturated with decomposition gas of an organic binder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20671188A JPH0257614A (en) | 1988-08-20 | 1988-08-20 | Degreasing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20671188A JPH0257614A (en) | 1988-08-20 | 1988-08-20 | Degreasing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0257614A true JPH0257614A (en) | 1990-02-27 |
Family
ID=16527844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20671188A Pending JPH0257614A (en) | 1988-08-20 | 1988-08-20 | Degreasing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0257614A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4973077A (en) * | 1989-05-31 | 1990-11-27 | Chuo Hatsujo Kabushiki Kaisha | Stabilizer device for motor vehicles |
-
1988
- 1988-08-20 JP JP20671188A patent/JPH0257614A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4973077A (en) * | 1989-05-31 | 1990-11-27 | Chuo Hatsujo Kabushiki Kaisha | Stabilizer device for motor vehicles |
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