JPH0483802A - Vacuum sintering method - Google Patents
Vacuum sintering methodInfo
- Publication number
- JPH0483802A JPH0483802A JP2195652A JP19565290A JPH0483802A JP H0483802 A JPH0483802 A JP H0483802A JP 2195652 A JP2195652 A JP 2195652A JP 19565290 A JP19565290 A JP 19565290A JP H0483802 A JPH0483802 A JP H0483802A
- Authority
- JP
- Japan
- Prior art keywords
- vacuum
- exhaust system
- pump
- air exhaust
- valve
- 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.)
- Granted
Links
- 238000005245 sintering Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 20
- 239000004902 Softening Agent Substances 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims description 14
- 239000003350 kerosene Substances 0.000 abstract description 3
- 239000010721 machine oil Substances 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- BPJYAXCTOHRFDQ-UHFFFAOYSA-L tetracopper;2,4,6-trioxido-1,3,5,2,4,6-trioxatriarsinane;diacetate Chemical compound [Cu+2].[Cu+2].[Cu+2].[Cu+2].CC([O-])=O.CC([O-])=O.[O-][As]1O[As]([O-])O[As]([O-])O1.[O-][As]1O[As]([O-])O[As]([O-])O1 BPJYAXCTOHRFDQ-UHFFFAOYSA-L 0.000 abstract 3
- 239000001993 wax Substances 0.000 description 11
- 238000001816 cooling Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Powder Metallurgy (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】 〈産業上の利用分野〉 本発明は真空焼結方法に関する。[Detailed description of the invention] <Industrial application field> The present invention relates to a vacuum sintering method.
真空炉を用いて粉末成形物を真空焼結することが行なわ
れている。該真空焼結は一般に、真空雰囲気の形成→脱
ワックス処理→焼結処理→冷却処理の手順で行なわれる
。該脱ワックス処理は、粉末成形物から、該粉末成形物
を成形する際に主に粘結剤として用いたワックス類を、
焼結処理に先立って除去しておくための処理である０通
常、該脱ワックス処理は、４００〜６００℃程度の加熱
下、数Ｔｏｒｒ〜数十Ｔｏｒｒの真空雰囲気で、キャリ
アーガスを流しながら行なわれ、また焼結処理は、１０
００−１４００℃程度の加熱下、数Ｔｏｒｒの真空雰囲
気で行なわれる。Vacuum sintering of powder molded products is performed using a vacuum furnace. The vacuum sintering is generally performed in the following steps: formation of a vacuum atmosphere, dewaxing treatment, sintering treatment, and cooling treatment. The dewaxing process removes waxes, which were mainly used as a binder when molding the powder molded product, from the powder molded product.
This is a process to remove the wax prior to the sintering process. Usually, the dewaxing process is carried out under heating at about 400 to 600°C in a vacuum atmosphere of several Torr to several tens of Torr while flowing a carrier gas. and the sintering process is 10
The process is carried out under heating at about 00 to 1,400°C in a vacuum atmosphere of several Torr.
本発明は上記のような真空焼結方法の改良に関するもの
である。The present invention relates to an improvement of the vacuum sintering method as described above.
〈従来の技術、その課題〉
従来、真空炉を用いて粉末成形物を真空焼結する場合、
脱ワックス処理においてキャリアーガスと共に飛散した
ワックス類を該真空炉の排気系統に介装されているトラ
ップで捕捉することが行なわれている。<Conventional technology and its problems> Conventionally, when vacuum sintering a powder molded product using a vacuum furnace,
During the dewaxing process, waxes scattered together with the carrier gas are captured in a trap installed in the exhaust system of the vacuum furnace.
ところが５かかる従来の真空焼結方法には、実際のとこ
ろ、飛散したワックス類がトラップで捕捉されずに、真
空ポンプまで持ち込まれ、該真空ポンプを構成する機械
部品の表面に凝固してしまうという課題がある。このよ
うな凝固は、ワックス類としてステアリン酸亜鉛や特に
アマイド系のものを使用した粉末成形物を脱ワックス処
理する場合に著るしい、真空ポンプを構成する機械部品
の表面にワックス類が凝固すると、それだけ抵抗が増し
、安全回路が作動して該真空ポンプが停止してしまう、
また凝固したワー、クス類は単に真空ポンプのオイルを
交換するだけでは取り除くことができないため、該真空
ポンプの分解清掃という誠に厄介な作業を強いられるこ
とになる。However, in the conventional vacuum sintering method, the scattered wax is not captured by the trap, but is carried to the vacuum pump, where it solidifies on the surfaces of the mechanical parts that make up the vacuum pump. There are challenges. This kind of coagulation is noticeable when dewaxing powder molded products using zinc stearate or especially amide-based waxes. , the resistance will increase accordingly and the safety circuit will be activated and the vacuum pump will stop.
Further, since solidified work and waste cannot be removed simply by changing the oil in the vacuum pump, the user is forced to disassemble and clean the vacuum pump, which is a truly troublesome task.
〈発明が解決しようとする課題、その解決手段〉本発明
は叙上の如き従来の課題を解決する改良された真空焼結
方法を提供するものである。<Problems to be Solved by the Invention and Means for Solving the Problems> The present invention provides an improved vacuum sintering method that solves the conventional problems as described above.
しかして本発明は、
真空炉を用いて粉末成形物を真空焼結する際に、該真空
炉の排気系統へ軟化剤を注入することを特徴とする真空
焼結方法に係る。Therefore, the present invention relates to a vacuum sintering method characterized by injecting a softener into the exhaust system of the vacuum furnace when vacuum sintering a powder molded product using the vacuum furnace.
く作用〉
真空炉の排気系統へ軟化剤を注入すると、該軟化剤によ
って、ワックス類が真空ポンプまで持ち込まれてもその
凝固を防止することができる。該軟化剤には凝固したワ
ックス類を溶解する作用もある。したがって粉末成形物
を真空焼結するいずれの段階においても軟化剤の注入は
相応に有効であるが、ワックス類が真空ポンプまで持ち
込まれるのはその殆んどが脱ワックス処理の段階である
ため、該脱ワックス処理において軟化剤を注入するのが
最も有効である。具体的に軟化剤の注入は、真空ポンプ
の運転中に行なってもよいし又は停止中に行なってもよ
く、連続的に行なってもよいし又は断続的に行なっても
よい。その注入個所は、真空ポンプ以前の上流側におけ
る排気系統であれば特に制限されないが、真空ポンプそ
れ自体又は真空ポンプの直前が最も有効である。Effects> When a softener is injected into the exhaust system of a vacuum furnace, the softener can prevent waxes from solidifying even if they are brought to the vacuum pump. The softener also has the effect of dissolving solidified waxes. Therefore, injection of a softening agent is reasonably effective at any stage of vacuum sintering a powder molded product, but most waxes are brought to the vacuum pump during the dewaxing process. It is most effective to inject a softener in the dewaxing process. Specifically, the softening agent may be injected while the vacuum pump is in operation or while the vacuum pump is stopped, and may be carried out continuously or intermittently. The injection point is not particularly limited as long as it is in the exhaust system upstream before the vacuum pump, but the most effective location is the vacuum pump itself or immediately before the vacuum pump.
本発明において、軟化剤としては、灯油や機械油等を使
用することができる。In the present invention, kerosene, machine oil, etc. can be used as the softener.
〈実施例〉
第１図は本発明の一実施状態を示す略視図である。真空
炉１１に排気系統２１が接続されている。排気系統２１
には、真空ポンプとしてのメカニカルブースタポンプ３
１やロータリポンプ３２、更にはバルブ４１〜４４の他
に、図示しないトラップ等が介装されており、メカニカ
ルブースタポンプ３１にはバイパス系統２２が枝管され
ていて、ロータリポンプ３２にはフィルタ５１を介装す
るオイル循環系統２３が配管されている。そして図面の
場合、メカニカルブースタポンプ３１及びロータリポン
プ３２のそれぞれ直前で、バルブ４５．４６を介し排気
系統２１へ軟化剤を注入するようになっている。<Example> FIG. 1 is a schematic diagram showing one implementation state of the present invention. An exhaust system 21 is connected to the vacuum furnace 11 . Exhaust system 21
Mechanical booster pump 3 as a vacuum pump
1, the rotary pump 32, and valves 41 to 44, traps (not shown) are installed. An oil circulation system 23 interposed therein is piped. In the case of the drawing, the softener is injected into the exhaust system 21 through valves 45 and 46 immediately before the mechanical booster pump 31 and the rotary pump 32, respectively.
真空炉１１を用いて粉末成形物を真空焼結する際の代表
的には脱ワックス処理において、バルブ４１→メカニカ
ルブースタポンプ３１→Ａ）シブ４２→ロータリポンプ
３２の排気系統２１を使用する場合には、メカニカルブ
ースタポンプ３１及びロータリポンプ３２のそれぞれ直
前で排気系統２１へ軟化剤を注入し、またバルブ４３→
バイパス系統２２→バルブ４４→ロータリポンプ３２の
排気系統２１を使用する場合には、ロータリポンプ３２
の直前で排気系統２１へ軟化剤を注入するのである。Typically, in the dewaxing process when vacuum sintering a powder molded product using the vacuum furnace 11, when using the exhaust system 21 of the valve 41 → mechanical booster pump 31 → A) shiv 42 → rotary pump 32. The softener is injected into the exhaust system 21 immediately before the mechanical booster pump 31 and the rotary pump 32, and the valve 43→
When using the exhaust system 21 of the bypass system 22 → valve 44 → rotary pump 32, the rotary pump 32
The softening agent is injected into the exhaust system 21 just before.
第１表は、次の条件下で粉末成形物をバッチ的に真空焼
結したときのメカニカルブースタポンプ３１及びロータ
リポンプ３２の停止回数（回／月）を例示するものであ
る。Table 1 exemplifies the number of times the mechanical booster pump 31 and rotary pump 32 are stopped (times/month) when powder compacts are vacuum sintered in batches under the following conditions.
条件
粉末成形物に使用したワックス類ニアマイト系ワックス
を１重量％、脱ワックス処理：４５０〜５５０℃、１０
〜１５ Ｔｏｒｒ、脱ワックス処理における排気系統：
第１図において、バルブ４１→メカニカルブースタポン
プ３１→バルブ４２→ロータリポンプ３２．軟化剤：脱
ワックス処理において、各パッチ毎に、メカニカルブー
スタポンプ３１及びロータリポンプ３２のそれぞれ直前
で１合計５０１の灯油を断続注入。焼結処理：１０００
〜１１ＯＯ℃、２−３ Ｔｏｒｒｅ冷却処理：冷却窒稟
ガスの循環。Conditions Waxes used in powder moldings Nearmite wax was 1% by weight, dewaxing treatment: 450-550°C, 10% by weight.
~15 Torr, exhaust system in dewaxing process:
In FIG. 1, valve 41→mechanical booster pump 31→valve 42→rotary pump 32. Softener: In the dewaxing process, a total of 501 kerosene was injected intermittently into each patch immediately before each of the mechanical booster pump 31 and rotary pump 32. Sintering treatment: 1000
~11OO°C, 2-3 Torre cooling treatment: circulation of cooling nitrogen gas.
〈発明の効果〉
既に明らかなように、以上説明した本発明には真空炉を
用いて粉末成形物を真空焼結する際に該粉末成形物から
飛散したワックス類が該真空炉の排気系統に介装されて
いる真空ポンプで凝固するのを防止することができ、結
局は粉末成形物の真空焼結を能率的に行なうことができ
るという効果がある。<Effects of the Invention> As is already clear, in the present invention described above, when a powder molded product is vacuum sintered using a vacuum furnace, waxes scattered from the powder molded product enter the exhaust system of the vacuum furnace. It is possible to prevent solidification by the interposed vacuum pump, and as a result, the vacuum sintering of the powder molded product can be efficiently performed.
第１図は本発明の一実施状態を示す略視図である。
１１・・・・真空炉、２１・・・・排気系統２２・・・
・バイパス系統、２３・・・・オイル循環系統３１・・
・・メカニカルブースタポンプ３２・・・・ロータリポ
ンプ
４１〜４６・・・・バルブ、５１・・・・フィルタ第１
図
特許出願人 大同特殊鋼株式会社
代理人 弁理士 入 山 宏 正FIG. 1 is a schematic diagram showing one implementation state of the present invention. 11... Vacuum furnace, 21... Exhaust system 22...
・Bypass system, 23...Oil circulation system 31...
... Mechanical booster pump 32 ... Rotary pump 41 to 46 ... Valve, 51 ... Filter 1st
Figure patent applicant Daido Steel Co., Ltd. Agent Patent attorney Hiromasa Iriyama
Claims (2)
真空炉の排気系統へ軟化剤を注入することを特徴とする
真空焼結方法。1. A vacuum sintering method characterized by injecting a softener into an exhaust system of the vacuum furnace when vacuum sintering a powder molded product using a vacuum furnace.
注入する請求項１記載の真空焼結方法。2. 2. The vacuum sintering method according to claim 1, wherein a softening agent is injected during the dewaxing treatment during vacuum sintering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2195652A JP3000634B2 (en) | 1990-07-24 | 1990-07-24 | Vacuum sintering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2195652A JP3000634B2 (en) | 1990-07-24 | 1990-07-24 | Vacuum sintering method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0483802A true JPH0483802A (en) | 1992-03-17 |
| JP3000634B2 JP3000634B2 (en) | 2000-01-17 |
Family
ID=16344736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2195652A Expired - Lifetime JP3000634B2 (en) | 1990-07-24 | 1990-07-24 | Vacuum sintering method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3000634B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112011101532T5 (en) | 2011-02-16 | 2013-02-28 | Rigaku Corporation | X-ray detection signal processing apparatus and method therefor |
-
1990
- 1990-07-24 JP JP2195652A patent/JP3000634B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112011101532T5 (en) | 2011-02-16 | 2013-02-28 | Rigaku Corporation | X-ray detection signal processing apparatus and method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3000634B2 (en) | 2000-01-17 |
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