JPH02203192A - Rapid degreasing furnace of powder moldings - Google Patents
Rapid degreasing furnace of powder moldingsInfo
- Publication number
- JPH02203192A JPH02203192A JP2281089A JP2281089A JPH02203192A JP H02203192 A JPH02203192 A JP H02203192A JP 2281089 A JP2281089 A JP 2281089A JP 2281089 A JP2281089 A JP 2281089A JP H02203192 A JPH02203192 A JP H02203192A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- binder
- inert gas
- heating chamber
- molded product
- 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 24
- 239000000843 powder Substances 0.000 title claims description 13
- 238000000465 moulding Methods 0.000 title abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 29
- 239000011261 inert gas Substances 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims description 39
- 238000001816 cooling Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 12
- 230000007547 defect Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 7
- 230000008020 evaporation Effects 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 abstract 1
- 230000001939 inductive effect Effects 0.000 abstract 1
- 239000011148 porous material Substances 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000019808 microcrystalline wax Nutrition 0.000 description 1
- 239000004200 microcrystalline wax Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野コ
本発明は、粉体成形品からバインダを除去する脱脂炉に
係り、特に炉内を加圧状態にして脱脂する粉体成形品の
脱脂炉に間する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a degreasing furnace for removing binder from a powder molded product, and particularly to a degreasing furnace for powder molded products in which the inside of the furnace is pressurized to degrease the powder molded product. in between.
[従来の技術]
従来、セラミック粉・金属粉50〜60体積%、ワック
ス・ポリマ等のバインダ40〜60体積%からなる射出
成形品の脱脂は、加熱炉内で該成形品を加熱し、バイン
ダを成形品から流出、気化させて除去している。その際
に加熱炉内の雰囲気を加圧状態にしておくと、成形品か
らの急激なガス発生を抑制し、脱脂時に発生しゃすい空
孔やふくれ等の欠陥を生じることがなく、常圧雰囲気の
場合に比べて脱脂を迅速に行えることが知られている。[Prior Art] Conventionally, injection molded products containing 50 to 60 volume % of ceramic powder or metal powder and 40 to 60 volume % of binder such as wax or polymer have been degreased by heating the molded product in a heating furnace to remove the binder. flows out of the molded product and is removed by vaporization. At that time, if the atmosphere in the heating furnace is kept under pressure, the rapid generation of gas from the molded product will be suppressed, and defects such as pores and blisters that are likely to occur during degreasing will not occur, and the atmosphere in the heating furnace will be kept under pressure. It is known that degreasing can be performed more quickly than in the case of
[発明が解決しようとする課題]
しかしながら炉内雰囲気を加圧状態にする手段として、
大気あるいはAr、N2等の不活性ガスをコンプレッサ
等を用いて加圧する方法あるいはAr、N2等のガスボ
ンベの圧力を利用して加圧する方法があるが、バインダ
の気化分は炉内を一定圧力に保ちながら投入されている
大気あるいは不活性ガスとともにバインダトラップに排
出されるので加圧装置が必要であり、また不活性ガスを
使用する場合は不活性ガスを流気させるためガス消費量
が多くなり、ランニングコストが高いという問題点があ
った。[Problem to be solved by the invention] However, as a means to pressurize the atmosphere inside the furnace,
There is a method of pressurizing the atmosphere or an inert gas such as Ar or N2 using a compressor, or a method of pressurizing using the pressure of a gas cylinder such as Ar or N2. A pressurizing device is required because the binder trap is discharged together with the atmosphere or inert gas that is being input while maintaining the temperature.Also, when using an inert gas, the amount of gas consumed increases because the inert gas is forced to flow. However, there was a problem that running costs were high.
本発明は上述した従来の問題点に看目し、不活性ガスの
消費量が少なく、かつ短時間で成形品の脱脂を行うこと
ができる脱脂炉を提供することを目的とする。SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to provide a degreasing furnace that consumes less inert gas and can degrease molded products in a short time.
[111を解決するための手段]
上記目的を達成するために、本発明に係る粉体成形品の
迅速脱脂炉は、加熱炉内に設けた気密構造の加熱室に、
気密構造で冷却機能を備えたバインダトラップを連結し
、ワックス・ポリマ等のバインダと混練して成形した粉
体の成形品を該加熱室に入れ、加熱室に不活性ガスを充
填した後該加熱室を加熱し、加熱室内の温度上昇に伴う
不活性ガスの体積膨張を利用して前記成形品を加圧しつ
つ、該成形品に含まれるバインダを流出・気化させる構
成とした。[Means for solving 111] In order to achieve the above object, the quick degreasing furnace for powder molded products according to the present invention includes a heating chamber with an airtight structure provided in the heating furnace,
A binder trap with an airtight structure and a cooling function is connected, and a powder molded product made by kneading with a binder such as wax or polymer is placed in the heating chamber, and after filling the heating chamber with inert gas, the heating is performed. The chamber is heated, and the molded article is pressurized by utilizing the volumetric expansion of the inert gas as the temperature rises within the heating chamber, while the binder contained in the molded article flows out and vaporizes.
[作用]
上記構成によれば、密閉した加熱室内に充填した不活性
ガスの加熱による体積膨張を利用して成形品を加圧しつ
つ、該成形品に含まれるバインダを流出・気化させるよ
うにしたので、成形品に空孔・ふくれ等の欠陥を生じさ
せることなく、少量の不活性ガスを用いて迅速に脱脂す
ることができる。[Function] According to the above configuration, the binder contained in the molded product flows out and vaporizes while pressurizing the molded product by utilizing the volumetric expansion caused by the heating of the inert gas filled in the sealed heating chamber. Therefore, it is possible to quickly degrease the molded product using a small amount of inert gas without causing defects such as holes or blisters in the molded product.
[実施例コ
以下に、本発明に係る粉体成形品の迅速脱脂炉の製造法
の実施例について、図面を参照して詳細に説明する。[Example 7] Hereinafter, an example of the method for manufacturing a rapid degreasing furnace for powder molded products according to the present invention will be described in detail with reference to the drawings.
第1図において、加熱炉内に気密構造の加熱室lが設け
られ、気密構造で周囲に冷却水2を配し、下端部に蓋3
を取着したバインダトラップ4が前記加熱室1に連結さ
れている。加熱室1とバインダトラップ4との連結部に
はリーク用ニードル弁5、真空引き用ニードル弁6、ガ
ス導入用ニードル弁7、安全弁8、圧力制御用電磁弁9
、および圧力計10、圧力センサ11が装着されている
。また加熱室1内には発熱体12が設置され、該加熱室
1は断熱材13て包囲されている。In FIG. 1, a heating chamber l with an airtight structure is provided in the heating furnace, cooling water 2 is arranged around the airtight structure, and a lid 3 is provided at the lower end.
A binder trap 4 with a binder attached thereto is connected to the heating chamber 1. At the connection between the heating chamber 1 and the binder trap 4, there are a needle valve 5 for leakage, a needle valve 6 for evacuation, a needle valve 7 for gas introduction, a safety valve 8, and a solenoid valve 9 for pressure control.
, a pressure gauge 10, and a pressure sensor 11 are installed. Further, a heating element 12 is installed in the heating chamber 1, and the heating chamber 1 is surrounded by a heat insulating material 13.
バインダを含んだ成形品14を加熱室1内に入れ、真空
引き用ニードル弁6を操作して該加熱室l内を真空とし
た後、ガス導入用ニードル弁7を問いてAr、N2等の
不活性ガスを導入し、加熱室1を設定温度に到達するま
で加熱する。ガスとして大気を使用する場合は加熱室1
内を真空に引く必要はなく、成形品14を出し入れする
際に加熱室lに導入される大気をそのまま密閉状態にし
て加熱すればよい。The molded product 14 containing the binder is placed in the heating chamber 1, the vacuum needle valve 6 is operated to create a vacuum in the heating chamber 1, and then the gas introduction needle valve 7 is injected with Ar, N2, etc. Inert gas is introduced and heating chamber 1 is heated until it reaches a set temperature. Heating chamber 1 when using air as the gas
There is no need to evacuate the inside of the molded product 14, and the air introduced into the heating chamber 1 when taking the molded product 14 in and out of the molded product 14 may be kept in a sealed state for heating.
不活性ガスの圧力をPl 体積をv5 温度をT(0
K)とすると、 PV/T=一定 であるから温度
上昇に伴って加熱室1内の圧力が上昇し、バインダの成
形品からの急激な流出・気化を抑制して、該成形品の空
孔◆ふくれ等の欠陥発生を防止する。気化したバインダ
はバインダトラップ4に導かれ、冷却されて再固化し、
バインダトラップ4の底部に溜るので、脱脂後蓋3を取
り外して再固化したバインダ15を除去することができ
る。The pressure of the inert gas is Pl, the volume is v5, the temperature is T(0
K), since PV/T=constant, the pressure inside the heating chamber 1 increases as the temperature rises, suppressing the rapid outflow and vaporization of the binder from the molded product, and filling the pores of the molded product. ◆Prevent defects such as blistering. The vaporized binder is led to the binder trap 4, where it is cooled and solidified again.
Since it collects at the bottom of the binder trap 4, the resolidified binder 15 can be removed by removing the lid 3 after degreasing.
安全弁8は加熱室lおよびバインダトラップ4が許容圧
力を超えることのないようにするために設置されている
。The safety valve 8 is installed to prevent the heating chamber 1 and the binder trap 4 from exceeding an allowable pressure.
平均粒径5μmのカーボニル鉄粉56体積%、マイクロ
クリスタリンワックス、低分子アクリル、EVAを配合
したバインダ45体積%を加圧式ニーダを用い、150
℃にて1時間混練し、冷却後3mm以下の粒に破砕し、
150℃に加熱した射出成形機シリンダ内に投入した。Using a pressure kneader, 56% by volume of carbonyl iron powder with an average particle size of 5 μm, 45% by volume of a binder containing microcrystalline wax, low-molecular acrylic, and EVA was mixed into 150% by volume using a pressure kneader.
Kneaded for 1 hour at ℃, crushed into particles of 3 mm or less after cooling,
The mixture was placed into an injection molding machine cylinder heated to 150°C.
金型は6 X 4 X 50 mmの棒材成形用のもの
を用い、射出圧800kg/c+++2で成形を実施し
た。A mold for molding a bar measuring 6 x 4 x 50 mm was used, and the molding was carried out at an injection pressure of 800 kg/c++2.
成形品20個について従来の常圧脱脂炉と本発明による
迅速脱脂炉とて10個ずつ処理し、比較した。常圧脱脂
炉ではN2ガスを流気させながら毎時5℃または10℃
の昇温速度で常温から500℃まで各5個加熱し、迅速
脱脂炉では加熱室を真空に引いた後N2ガスを絶対圧で
1気圧まで導入し、密閉状態で毎時5℃または10℃の
昇温速度で常温から500℃まで各5個加熱した。迅速
脱脂炉では常温(18℃)で1気圧であったものが50
0℃に昇温したときには2゜4気圧になったが、第2図
に示すように昇温中炉圧がリニアに上昇せず、途中で若
干高めになるのは成形品から気化したバインダのガス圧
によるものである。20 molded products were processed in a conventional normal pressure degreasing furnace and 10 in a rapid degreasing furnace according to the present invention for comparison. In the normal pressure degreasing furnace, the temperature is 5°C or 10°C per hour while flowing N2 gas.
Heat up 5 pieces each from room temperature to 500℃ at a heating rate of Five pieces each were heated from room temperature to 500°C at a heating rate. In the rapid degreasing furnace, the pressure of 1 atm at room temperature (18°C) was reduced to 50
When the temperature was raised to 0°C, the pressure became 2° and 4 atm. However, as shown in Figure 2, the furnace pressure did not rise linearly during the temperature rise, and the reason why it became slightly higher in the middle was due to the binder vaporized from the molded product. This is due to gas pressure.
上記による脱脂を行った成形品を外観およびX線撮影に
より欠陥を調査したところ、第1表に示したように従来
法の常圧脱脂品は、われ・ふくれ・空孔等の欠陥が発生
しているのに対して、本発明による迅速脱脂炉の場合は
10℃/時の昇温速度でも欠陥のない脱脂品が得られた
。When molded products that had been degreased as described above were examined for defects using external appearance and X-ray photography, as shown in Table 1, products degreased using conventional atmospheric pressure methods were found to have defects such as cracks, blisters, and holes. In contrast, in the case of the rapid degreasing furnace according to the present invention, defect-free degreased products were obtained even at a heating rate of 10° C./hour.
従って従来の常圧脱脂法に比べ昇温速度を2倍以上にす
ることが可能であること、およびN2ガスは初期に投入
するだけで、ガスの消費が節約でき、経済的な加圧脱脂
が可能であることが判明した。なお第1表において、脱
脂後良品率の欄の()内数字は、良品数/脱脂処理数で
ある。Therefore, it is possible to more than double the temperature increase rate compared to the conventional normal pressure degreasing method, and by simply introducing N2 gas at the beginning, gas consumption can be saved and economical pressure degreasing can be achieved. It turns out it's possible. In Table 1, the numbers in parentheses in the column for the percentage of non-defective products after degreasing are the number of non-defective products/the number of degreased products.
本実8v例では圧力制御弁9を設置したので、昇温前か
ら加熱室内を加圧状態にしておき、所第 1
表
定の脱脂最高温度まで一定圧力を維持しつつ脱脂作業を
行うことも可能である。また不活性ガスとしてN2ガス
を用いたが、これに限るものでなくAr、大気等を用い
てもよい、ただし大気を用いる場合は、爆発の危険性を
避けるために炉内温度を320℃以下に抑える必要があ
る。In this 8V example, a pressure control valve 9 is installed, so the heating chamber is pressurized before the temperature rises, and degreasing work can be performed while maintaining a constant pressure up to the maximum degreasing temperature specified in Table 1. It is possible. In addition, although N2 gas was used as the inert gas, it is not limited to this, and Ar, air, etc. may also be used. However, when using air, the temperature inside the furnace should be kept below 320°C to avoid the risk of explosion. It is necessary to keep it to
[発明の効果]
以上説明したように本発明によれば、密閉した加熱室内
に充填した大気あるいは不活性ガスの加熱による体積膨
張を利用して成形品を加圧しつつ、該成形品に含まれる
バインダを流出・気化させるようにしたので、成形品か
らバインダが流出す4際に発生しゃすい空孔・ふくれ等
の欠陥を生じさせることなく、従来の常圧脱脂法に比べ
昇温速度を2倍以上にして短時間で脱脂することができ
るとともに、不活性ガスの消費が節約できるという効果
が得られる。[Effects of the Invention] As explained above, according to the present invention, a molded product is pressurized by utilizing the volumetric expansion caused by the heating of the air or inert gas filled in a sealed heating chamber. Since the binder flows out and evaporates, the temperature rise rate is reduced by 2 times compared to the conventional normal pressure degreasing method, without creating defects such as pores and blisters that occur when the binder flows out from the molded product. It is possible to perform degreasing in a short time by more than double the amount, and also to save on inert gas consumption.
第1図は実施例に係る粉体成形品の迅速脱脂炉の断面説
明図、第2図は炉温と炉圧との間係を示すグラフである
。
1・・・・・・加熱室
4・・・・・・バインダトラップ
14・・・・・・成形品
第1図
特許出願人 株式会社小松製作所
炉温
wc2vi!JFIG. 1 is an explanatory cross-sectional view of a quick degreasing furnace for powder molded products according to an example, and FIG. 2 is a graph showing the relationship between furnace temperature and furnace pressure. 1... Heating chamber 4... Binder trap 14... Molded product Figure 1 Patent applicant Komatsu Ltd. Furnace temperature wc2vi! J
Claims (1)
却機能を備えたバインダトラップ4を連結し、ワックス
・ポリマ等のバインダと混練して成形したセラミック粉
・金属粉等の成形品14を該加熱室1に入れ、加熱室1
に不活性ガスを充填した後該加熱室1を加熱し、加熱室
1内の温度上昇に伴う不活性ガスの体積膨張を利用して
前記成形品14を加圧しつつ、該成形品14に含まれる
バインダを流出・気化させるようにしたことを特徴とす
る粉体成形品の迅速脱脂炉。A binder trap 4 with an airtight structure and cooling function is connected to a heating chamber 1 with an airtight structure provided in a heating furnace, and a molded product of ceramic powder, metal powder, etc. is kneaded with a binder such as wax or polymer. 14 into the heating chamber 1,
After filling with an inert gas, the heating chamber 1 is heated, and while pressurizing the molded product 14 by utilizing the volumetric expansion of the inert gas accompanying the temperature rise in the heating chamber 1, the molded product 14 is heated. A quick degreasing furnace for powder molded products, characterized in that the binder flowing out and vaporizes.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2281089A JPH02203192A (en) | 1989-01-31 | 1989-01-31 | Rapid degreasing furnace of powder moldings |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2281089A JPH02203192A (en) | 1989-01-31 | 1989-01-31 | Rapid degreasing furnace of powder moldings |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02203192A true JPH02203192A (en) | 1990-08-13 |
Family
ID=12093047
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2281089A Pending JPH02203192A (en) | 1989-01-31 | 1989-01-31 | Rapid degreasing furnace of powder moldings |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02203192A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107042303A (en) * | 2017-04-07 | 2017-08-15 | 海安县鹰球粉末冶金有限公司 | A kind of de- furnace apparatus of vacuum and atmosphere dual-purpose type heat |
-
1989
- 1989-01-31 JP JP2281089A patent/JPH02203192A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107042303A (en) * | 2017-04-07 | 2017-08-15 | 海安县鹰球粉末冶金有限公司 | A kind of de- furnace apparatus of vacuum and atmosphere dual-purpose type heat |
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