JPH0627039B2 - Degreasing method for ceramic molded products - Google Patents
Degreasing method for ceramic molded productsInfo
- Publication number
- JPH0627039B2 JPH0627039B2 JP63158818A JP15881888A JPH0627039B2 JP H0627039 B2 JPH0627039 B2 JP H0627039B2 JP 63158818 A JP63158818 A JP 63158818A JP 15881888 A JP15881888 A JP 15881888A JP H0627039 B2 JPH0627039 B2 JP H0627039B2
- Authority
- JP
- Japan
- Prior art keywords
- ceramic molded
- furnace
- molded product
- degreasing
- color
- 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
Links
- 239000000919 ceramic Substances 0.000 title claims description 41
- 238000005238 degreasing Methods 0.000 title claims description 26
- 238000000034 method Methods 0.000 title claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000011230 binding agent Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000011261 inert gas Substances 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 238000000354 decomposition reaction Methods 0.000 description 7
- 238000000465 moulding Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- CNLGIQUFFSFRCH-XPBPLWSISA-N (2s,3s)-2-[4-[(1s)-1-amino-2-(4-hydroxyphenyl)ethyl]triazol-1-yl]-1-[4-[4-[4-[(2s,3s)-2-[4-[(1s)-1-amino-2-(4-hydroxyphenyl)ethyl]triazol-1-yl]-3-methylpentanoyl]piperazin-1-yl]-6-[2-[2-(2-prop-2-ynoxyethoxy)ethoxy]ethylamino]-1,3,5-triazin-2-yl]piperazin Chemical compound Cl.C([C@H](N)C1=CN(N=N1)[C@@H]([C@@H](C)CC)C(=O)N1CCN(CC1)C=1N=C(NCCOCCOCCOCC#C)N=C(N=1)N1CCN(CC1)C(=O)[C@H]([C@@H](C)CC)N1N=NC(=C1)[C@@H](N)CC=1C=CC(O)=CC=1)C1=CC=C(O)C=C1 CNLGIQUFFSFRCH-XPBPLWSISA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、セラミック成形品の脱脂法に関するものであ
る。TECHNICAL FIELD The present invention relates to a degreasing method for ceramic molded articles.
［従来の技術］ 一般に、セラミックスの製造工程では、セラミック粉末
に有機結合剤を添加して流動性を付与した状態で成形を
行なう。成形にはプレス成形、押出成形のほか各種成形
法が知られているが、中でも射出成形は複雑な形状のセ
ラミック成形品が得られる利点がある。しかしながら、
射出成形を行なうには、材料に高い流動性が必要である
から、有機結合剤の添加量も多くなり、成形機に不要に
なった有機結合剤を加熱によって除去する脱脂という工
程が必要になる。[Prior Art] Generally, in the manufacturing process of ceramics, molding is performed in a state in which an organic binder is added to ceramic powder to impart fluidity. Various molding methods are known in addition to press molding, extrusion molding, and injection molding has the advantage that a ceramic molded product having a complicated shape can be obtained. However,
In order to perform injection molding, the material must have high fluidity, so the amount of organic binder added increases, and a process of degreasing that removes unnecessary organic binder in the molding machine by heating is required. .
ところで、脱脂工程においては、加熱温度、炉内の雰囲
気を形成する気体の供給量、炉内の雰囲気を形成する気
体中の酸素量等の加熱条件の設定が重要であり、条件設
定が不適切であると、セラミック成形品が割れたり、表
層の剥離が生じたりする。By the way, in the degreasing process, it is important to set the heating conditions such as the heating temperature, the supply amount of the gas that forms the atmosphere in the furnace, and the amount of oxygen in the gas that forms the atmosphere in the furnace. If so, the ceramic molded product may be cracked or the surface layer may be peeled off.
たとえば、セラミック成形品を過度に加熱したり、急激
に温度を上昇させたりすると、有機結合剤が分解して発
生する分解ガスの単位時間当たりの発生量が過剰にな
り、セラミック成形品内部でのガス圧によりセラミック
成形品が割れたり、膨れたり、表層が剥離したりすると
いう問題が生じるのである。For example, if the ceramic molded product is excessively heated or the temperature is rapidly raised, the amount of decomposition gas generated by the decomposition of the organic binder per unit time becomes excessive, and the inside of the ceramic molded product is The gas pressure causes problems such as cracking and swelling of the ceramic molded product, and peeling of the surface layer.
こうした問題を解決するために、従来は、セラミック成
形品を加熱する炉内の温度を熱電対等の温度センサで検
出し、炉内の温度に対応して予め設定された昇温プログ
ラムに従って炉内の温度を制御していた。In order to solve such a problem, conventionally, a temperature sensor such as a thermocouple is used to detect the temperature in the furnace for heating the ceramic molded product, and the temperature in the furnace is set in accordance with a preset heating program corresponding to the temperature in the furnace. The temperature was controlled.
しかしながら、セラミック成形品の中の有機結合剤の加
熱による分解ガスの発生量は、温度に一対一に対応する
ものではない。したがって、炉内の温度に基づいて炉内
の温度に制御しても、分解ガスの発生量が過剰になる場
合がある。However, the amount of decomposition gas generated by heating the organic binder in the ceramic molded product does not correspond to the temperature one-to-one. Therefore, even if the temperature inside the furnace is controlled based on the temperature inside the furnace, the amount of cracked gas generated may become excessive.
このような問題点を解決するために、炉内の温度に代え
てセラミック成形品の重量を検出し、重量変化に基づい
て炉内の温度を制御する方法が考えられている(特開昭
６１−１６３１７２号公報参照)。In order to solve such a problem, a method of detecting the weight of the ceramic molded product instead of the temperature in the furnace and controlling the temperature in the furnace based on the change in weight has been considered (JP-A-61-61). 163172).
［発明が解決しようとする課題］ セラミック成形品の重量を測定するには、差動トランス
等のセンサを用いるが、センシング棒に分解ガスの凝縮
物が付着すると、センシング棒の移動が妨げられ、重量
検出が正確に行なえないという問題が発生する。[Problems to be Solved by the Invention] To measure the weight of a ceramic molded product, a sensor such as a differential transformer is used. However, if a condensate of decomposition gas adheres to the sensing rod, the movement of the sensing rod is hindered. There is a problem that the weight cannot be detected accurately.
本発明は上記問題点を解決することを目的とするもので
あり、脱脂工程において、炉内のセラミック成形品の脱
脂状態を非接触で判定することにより、脱脂状態が正確
に判定できるようにしたセラミック成形品の脱脂法を提
供しようとするものである。The present invention is intended to solve the above problems, and in the degreasing step, by determining the degreased state of the ceramic molded product in the furnace in a non-contact manner, the degreased state can be accurately determined. It is intended to provide a degreasing method for ceramic molded products.
［課題を解決するための手段］ 本発明では、上記目的を達成するために、脱脂工程中
に、炉内のセラミック成形品の色を色分析手段により視
認し、セラミック成形品の色変化に基づいて判定された
脱脂率に応じて加熱条件を制御するのである。[Means for Solving the Problem] In the present invention, in order to achieve the above object, the color of a ceramic molded product in a furnace is visually confirmed by a color analysis means during a degreasing process, and based on a color change of the ceramic molded product. The heating condition is controlled according to the degreasing rate determined by the above.
［作用］ 上記構成によれば、セラミック成形品の脱脂工程中にお
いて、炉の外から脱脂率を非接触で判定できるから、セ
ンシング棒等の機械的手段で脱脂率を判定する場合のよ
うに分解ガスの凝集物の付着で判定不能になるという問
題が発生しないのである。[Operation] According to the above configuration, the degreasing rate can be determined from the outside of the furnace in a non-contact manner during the degreasing process of the ceramic molded product. The problem of being unable to determine due to the adhesion of gas aggregates does not occur.
［実施例］ セラミック成形品を加熱して脱脂を行なう炉１は、第１
図に示すように、炉１の中の温度条件を設定するヒータ
２を備えている。炉１の中へは、バルブ３を介して空気
が供給され、また、バルブ４を介して窒素等の不活性ガ
スが供給される。これらのバルブ３，４は開度が連続的
に調節できるようになっている。炉１の中の雰囲気を形
成する気体は、排出路５を通して外部に放出され、排出
路５には安全弁６が設けられる。さらに、排出路５に
は、酸素濃度検出器８が配設される。酸素濃度検出器８
(８aはセンサ部、８bは本体部)の出力は、管理用コンピ
ュータ９に入力され、炉１から排出された酸素の濃度に
基づいてヒータ２の設定温度とバルブ３，４の開度とが
調節される。ヒータ２は、管理用コンピュータ９にイン
タフェースを介して接続されたサイリスタ１０により制
御され、これにより、炉１の中の加熱昇温条件が設定さ
れる。また、各バルブ３，４はそれぞれ管理用コンピュ
ータ９にインタフェースを介し接続されたステップモー
タ等の開度調節器１１，１２により駆動され、炉１の中
への空気供給量と不活性ガス供給量とが調節される。[Example] The furnace 1 for heating and degreasing a ceramic molded article is the first
As shown in the figure, a heater 2 for setting temperature conditions in the furnace 1 is provided. Air is supplied into the furnace 1 through the valve 3, and an inert gas such as nitrogen is supplied through the valve 4. The openings of these valves 3 and 4 can be continuously adjusted. The gas forming the atmosphere in the furnace 1 is discharged to the outside through the discharge passage 5, and the discharge passage 5 is provided with a safety valve 6. Further, an oxygen concentration detector 8 is arranged in the discharge path 5. Oxygen concentration detector 8
The output (8a is a sensor section, 8b is a main section) is input to the management computer 9, and the set temperature of the heater 2 and the opening degrees of the valves 3 and 4 are determined based on the concentration of oxygen discharged from the furnace 1. Adjusted. The heater 2 is controlled by a thyristor 10 connected to the management computer 9 via an interface, whereby the heating and heating conditions in the furnace 1 are set. Further, the valves 3 and 4 are driven by opening degree adjusters 11 and 12 such as step motors which are connected to the management computer 9 via an interface, respectively, and the air supply amount and the inert gas supply amount into the furnace 1 are controlled. And are adjusted.
ところで、管理用コンピュータ９は、炉１の中のセラミ
ック成形品の状態も制御用のデータとして利用するよう
にしている。すなわち、第２図に示すように、炉１には
セラミック成形品２０の上方に水冷ジャケットに包まれ
た窓２１が形成され、窓２１の上方にはテレビカメラよ
りなる撮像器２２が配設されている。撮像器２２は、管
理用コンピュータ９に接続されたカラーコンピュータよ
りなる色分析器２３に接続され、セラミック成形品の色
に応じた信号が管理用コンピュータ９に送られるように
なっている。この撮像器２２と色分析器２３とにより色
分析手段が構成される。色分析器２３では、次式によっ
て、黄色度ΔＹを求める。すなわち、まず、三刺激値を
Ｘ，Ｙ，ＺとするときにＹＩという値を次のように設定
する。By the way, the management computer 9 also uses the state of the ceramic molded product in the furnace 1 as control data. That is, as shown in FIG. 2, in the furnace 1, a window 21 surrounded by a water cooling jacket is formed above the ceramic molded product 20, and an imager 22 composed of a television camera is arranged above the window 21. ing. The image pickup device 22 is connected to a color analyzer 23, which is a color computer connected to the management computer 9, and a signal corresponding to the color of the ceramic molded product is sent to the management computer 9. The image capturing device 22 and the color analyzer 23 constitute color analyzing means. The color analyzer 23 obtains the yellowness ΔY by the following formula. That is, first, when the tristimulus values are X, Y, and Z, the value YI is set as follows.
ここで、ＹＩの初期値をＹＩ０とするとき、黄色度ΔＹ
Ｉは、 ΔＹＩ＝ＹＩ−ＹＩ０ となる。黄色度ΔＹＩは、第３図に示すように、脱脂率
(実線)に対応している。したがって、管理用コンピュー
タ９では、黄色度ΔＹＩに応じて脱脂率を判定し、空気
供給量、不活性ガス供給量、温度を制御する。 Here, when the initial value of YI is YI 0 , the yellowness ΔY
I is ΔYI = YI−YI 0 . As shown in FIG. 3, the yellowness ΔYI is the degreasing rate.
It corresponds to (solid line). Therefore, the management computer 9 determines the degreasing rate according to the yellowness ΔYI, and controls the air supply amount, the inert gas supply amount, and the temperature.
制御は以下のように行なわれる。第４図に示すように、
まず、脱脂開始直後には、空気のみが供給され、(太破
線)、炉１の中の温度は上昇する。さらに、温度が上昇
して有機結合剤が分解を始めると、有機結合剤の分解お
よび一部炭化によりセラミック成形品２０が変色しはじ
める(二点鎖線)。セラミック成形品２０の色により管理
用コンピュータ９は脱脂率を判定しているから、脱脂率
が予め設定された所定値になると、炉１の中への空気供
給量を減少させるようにバルブ３の開度が調節され、ま
た、不活性ガスの供給量(細破線)を増大させるようにバ
ルブ４の開度が調節され、さらに、サイリスタ１０を介
して炉１の中の温度上昇率を小さくするようにヒータ２
が制御される。このとき、酸素濃度(一点鎖線)は低下す
る。また、炉１の中に供給される気体の総量は増加する
ように設定される。このような制御を行なうことによ
り、また、炉１の中の気体の総量が増加することによ
り、炉１の中の雰囲気の更新が迅速に行なわれセラミッ
ク成形品の表層部の分解ガスが除去されてセラミック成
形品の内部からの分解ガスの抜け道が形成され、セラミ
ック成形品に膨れが生じるのを防止することができる。
また、雰囲気が迅速に更新されることにより、炉１の中
の温度が低下してセラミック成形品が冷却され、有機結
合剤の分解が抑制されるのである。さらに、不活性ガス
が増加し酸素が減少するから、分解ガスの発生量が抑制
されるのである。すなわち、セラミック成形品の内部で
のガス圧の増加が抑制されるから、セラミック成形品に
膨れが生じたり、セラミック成形品が割れたりすること
が防止できるわけである。このようにして、有機結合剤
が分割しはじめるまでは、主として空気のみの雰囲気と
し、分割ガスの発生量の増加に伴なって不活性ガスの供
給量を増加させ、脱脂が十分に進むと、再び空気の供給
量を増やすようにしているのである。したがって、比較
的高価な不活性ガスのみを用いる場合に比較して、脱脂
工程におけるコストを低減することができるのである。The control is performed as follows. As shown in FIG.
First, immediately after the start of degreasing, only air is supplied (thick broken line) and the temperature in the furnace 1 rises. Furthermore, when the temperature rises and the organic binder begins to decompose, the ceramic molded product 20 begins to change color due to the decomposition and partial carbonization of the organic binder (two-dot chain line). Since the management computer 9 determines the degreasing rate based on the color of the ceramic molded article 20, when the degreasing rate reaches a preset predetermined value, the valve 3 of the valve 3 is controlled so as to reduce the air supply amount into the furnace 1. The opening degree is adjusted, and the opening degree of the valve 4 is adjusted so as to increase the supply amount of the inert gas (thin broken line), and further, the temperature rise rate in the furnace 1 is reduced via the thyristor 10. As heater 2
Is controlled. At this time, the oxygen concentration (dashed line) decreases. Also, the total amount of gas supplied into the furnace 1 is set to increase. By performing such control, and by increasing the total amount of gas in the furnace 1, the atmosphere in the furnace 1 is quickly updated and the decomposed gas in the surface layer portion of the ceramic molded product is removed. As a result, a passage for the decomposed gas from the inside of the ceramic molded product is formed, and it is possible to prevent the ceramic molded product from bulging.
Further, by rapidly updating the atmosphere, the temperature in the furnace 1 is lowered, the ceramic molded article is cooled, and the decomposition of the organic binder is suppressed. Furthermore, since the amount of inert gas increases and the amount of oxygen decreases, the amount of decomposition gas generated is suppressed. That is, since the increase in gas pressure inside the ceramic molded product is suppressed, it is possible to prevent the ceramic molded product from bulging or cracking. In this way, until the organic binder begins to split, mainly in an atmosphere of only air, increasing the supply amount of the inert gas with the increase in the generation amount of split gas, when the degreasing progresses sufficiently, It is trying to increase the air supply again. Therefore, the cost in the degreasing process can be reduced as compared with the case where only a relatively expensive inert gas is used.
上記実施例では、空気と不活性ガスとの混合比を可変と
しているが、炉１の中に空気のみを供給し、空気から吸
着等の方法で酸素を除去することにより雰囲気を制御す
るようにしてもよい。In the above embodiment, the mixing ratio of air and inert gas is variable, but only the air is supplied into the furnace 1 and the atmosphere is controlled by removing oxygen from the air by a method such as adsorption. May be.
［発明の効果］ 本発明は上述のように、セラミック成形品の脱脂工程中
に、炉内のセラミック成形品の色を色分析手段により視
認し、セラミック成形品の色変化に基づいて判定された
脱脂率に応じて加熱条件を制御するものであり、セラミ
ック成形品の脱脂を行なう炉の外から脱脂率を非接触で
判定できるから、センシング棒等の機械的手段で脱脂率
を判定する場合のように判定不能になることがないとい
う利点を有する。また、以上の方法により脱脂を行なっ
た結果、割れや膨れのないセラミック成形品を得ること
ができた。[Effects of the Invention] As described above, according to the present invention, during the degreasing process of the ceramic molded product, the color of the ceramic molded product in the furnace was visually confirmed by the color analysis means, and the judgment was made based on the color change of the ceramic molded product. The heating conditions are controlled according to the degreasing rate, and the degreasing rate can be determined in a non-contact manner from outside the furnace that degreases the ceramic molded product.Therefore, when determining the degreasing rate by mechanical means such as a sensing rod. As described above, there is an advantage that the determination cannot be made. Further, as a result of degreasing by the above method, a ceramic molded product without cracking or swelling could be obtained.
第１図は本発明の実施例を示すシステム構成図、第２図
は同上の要部構成図、第３図は同上の原理説明図、第４
図は同上の動作説明図である。 １……炉、２……ヒータ、３，４……バルブ、８……酸
素濃度検出器、９……管理用コンピュータ、２０……セ
ラミック成形品、２１……窓、２２……撮像器、２３…
色分析器。FIG. 1 is a system configuration diagram showing an embodiment of the present invention, FIG. 2 is a configuration diagram of main parts of the same as above, FIG.
The figure is a diagram for explaining the operation of the above. 1 ... Furnace, 2 ... Heater, 3, 4 ... Valve, 8 ... Oxygen concentration detector, 9 ... Management computer, 20 ... Ceramic molded product, 21 ... Window, 22 ... Imaging device, 23 ...
Color analyzer.
Claims (1)
ラミック成形品を炉内で加熱して有機結合剤を除去する
脱脂工程中に、炉内のセラミック成形品の色を色分析手
段により視認し、セラミック成形品の色変化に基づいて
判定された脱脂率に応じて加熱条件を制御することを特
徴とするセラミック成形品の脱脂法。1. A color analysis means visually confirms the color of a ceramic molded article in a furnace during a degreasing step of heating the ceramic molded article composed of ceramic powder and an organic binder in a furnace to remove the organic binder. A method for degreasing a ceramic molded article, comprising controlling heating conditions according to a degreasing rate determined based on a color change of the ceramic molded article.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63158818A JPH0627039B2 (en) | 1988-06-27 | 1988-06-27 | Degreasing method for ceramic molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63158818A JPH0627039B2 (en) | 1988-06-27 | 1988-06-27 | Degreasing method for ceramic molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH029769A JPH029769A (en) | 1990-01-12 |
| JPH0627039B2 true JPH0627039B2 (en) | 1994-04-13 |
Family
ID=15680038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63158818A Expired - Lifetime JPH0627039B2 (en) | 1988-06-27 | 1988-06-27 | Degreasing method for ceramic molded products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0627039B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0795905B2 (en) * | 1992-09-29 | 1995-10-18 | 日本配合飼料株式会社 | Crab breeding device and crab breeding method |
-
1988
- 1988-06-27 JP JP63158818A patent/JPH0627039B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH029769A (en) | 1990-01-12 |
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