JPH0387208A - Manufacture of ceramic product - Google Patents
Manufacture of ceramic productInfo
- Publication number
- JPH0387208A JPH0387208A JP22539889A JP22539889A JPH0387208A JP H0387208 A JPH0387208 A JP H0387208A JP 22539889 A JP22539889 A JP 22539889A JP 22539889 A JP22539889 A JP 22539889A JP H0387208 A JPH0387208 A JP H0387208A
- Authority
- JP
- Japan
- Prior art keywords
- molded body
- molded material
- molded
- heated
- molding
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000000465 moulding Methods 0.000 claims abstract description 22
- 230000002950 deficient Effects 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims description 9
- 239000011230 binding agent Substances 0.000 claims description 7
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 13
- 238000005238 degreasing Methods 0.000 abstract description 7
- 238000001816 cooling Methods 0.000 abstract description 4
- 239000000047 product Substances 0.000 description 33
- 238000001746 injection moulding Methods 0.000 description 11
- 230000007547 defect Effects 0.000 description 7
- 238000001125 extrusion Methods 0.000 description 5
- 239000012778 molding material Substances 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Landscapes
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明はセラミックス成形体の表面部に生じた欠陥凹凸
部を取り除く工程を備えたセラミックス製品の製造方法
に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing a ceramic product, which includes a step of removing defective unevenness formed on the surface of a ceramic molded body.
（従来の技術）
現在、セラミックス焼結体からなる製品を製造するため
には、セラミックス粉末を用いて最終製品形状に対応し
た形状をなす成形体を成形し、次いで成形体を脱脂処理
して成形体に含まれている有機バインダを取り除き、そ
の後成形体を焼結して焼結体を作製する方法が採用され
ている。(Prior technology) Currently, in order to manufacture products made of ceramic sintered bodies, ceramic powder is used to form a molded body that has a shape corresponding to the final product shape, and then the molded body is degreased and molded. A method has been adopted in which the organic binder contained in the molded body is removed and the molded body is then sintered to produce a sintered body.
しかして、従来セラミックス成形体を成形する方法の中
で射出成形法、押し出し成形法などにより成形体を成形
する場合には、成形体の表面部に欠陥である凹凸部が発
生することがある。特に射出成形法により成形体を成形
する場合には成形体の表面部に欠陥凹凸部が発生するこ
とが多い。射出成形法は、セラミックス粉末に有機バイ
ンダを添加した射出成形材料を加熱することによりスラ
リ状にして成形型の内部に射出することにより成形体を
する方法であるが、成形体の表面部に欠陥凹凸部である
「ひけ」、「ウェルドライン」、「パーティングライン
」が発生することがある。However, when a molded body is molded by injection molding, extrusion molding, or the like among conventional methods for molding a ceramic molded body, irregularities, which are defects, may occur on the surface of the molded body. In particular, when a molded body is molded by injection molding, defects and irregularities often occur on the surface of the molded body. In the injection molding method, an injection molding material made of ceramic powder and an organic binder is heated to form a slurry and then injected into the inside of a mold to form a molded product.However, defects may occur on the surface of the molded product. Uneven areas such as sink marks, weld lines, and parting lines may occur.
「ひけ」は、成形体内部のｔ４Ｊ出成形材料の温度低下
による体積の減少と、圧力低下に伴う体積の増加のバラ
ンスが崩れることを直接の原因として成形体表面部に生
ずる陥没現象であり、線状や浅い凹凸など種々の外観を
呈する。「ウェルドライン」は、成形型内部で射出成形
材料の二つの流動の先端が合流して溶着した部分に発生
する細い線である。「パーティングライン」は成形型の
分割部に周方向に形成されるものである。そして、これ
ら「ひけ」、「ウェルドライン」および「パーティング
ライン」はセラミックス製品の商品価値を低下させ、成
形体の強度を低下させるとともに亀裂発生の原因となる
。"Sink" is a sinking phenomenon that occurs on the surface of a molded body as a direct result of the imbalance between the decrease in volume due to the temperature drop of the t4J molding material inside the molded body and the increase in volume due to the pressure drop. It exhibits various appearances such as linear and shallow irregularities. A "weld line" is a thin line that occurs at the part where two flowing tips of the injection molding material meet and weld inside the mold. The "parting line" is formed in the circumferential direction at the dividing portion of the mold. These "sink marks,""weldlines," and "parting lines" reduce the commercial value of ceramic products, reduce the strength of the molded product, and cause cracks.
押し出し成形法は射出成形材料と同じ材料を金型を通し
て押し出し、特定の断面形状をもった連続した成形体を
成形する方法である。この成形法においては成形体の表
面部に「ひけ」が発生する。The extrusion molding method is a method in which the same material as the injection molding material is extruded through a mold to form a continuous molded body with a specific cross-sectional shape. In this molding method, "sink marks" occur on the surface of the molded product.
（発明が解決しようとする課題）
このように従来のセラミックス製品の製造において、射
出成形法や押し出し成形法により成形した成形体の表面
部に欠陥凹凸部が発生して成形体の品質を低下させ高品
質の製品を得る上で障害となるという問題が発生してい
る。(Problems to be Solved by the Invention) As described above, in the conventional manufacturing of ceramic products, defects and irregularities occur on the surface of the molded product formed by injection molding or extrusion molding, reducing the quality of the molded product. Problems have arisen that pose obstacles to obtaining high-quality products.
なお、この成形体の欠陥凹凸部を取り除くために、成形
体の表面部を切削加工する方法もあるが、この場合には
成形体の強度が弱いために欠陥凹凸部を取り除く切削加
工が大変困難で手数を要するとともに、切削加工中に成
形体を破損することもあり、さらには成形体を切削加工
代を見込んだ大きめの寸法で成形する必要がある。There is also a method of cutting the surface of the molded body in order to remove the defective unevenness of the molded body, but in this case, it is very difficult to remove the defective unevenness due to the weak strength of the molded body. This process is time-consuming, and the molded body may be damaged during cutting, and furthermore, the molded body must be molded to a larger size to allow for the cutting allowance.
本発明は前記事情に基づいてなされたもので、セラミッ
クス成形体の表面部に発生した欠陥凹凸部を容易且つ確
実に取り除いて良好な品質のセラミックス製品を得るこ
とができるセラミックス製品の製造方法を提供すること
を目的とする。The present invention has been made based on the above-mentioned circumstances, and provides a method for manufacturing ceramic products that can easily and reliably remove defective unevenness generated on the surface of a ceramic molded body to obtain a ceramic product of good quality. The purpose is to
［発明の構成コ
（課題を解決するための手段）
前記目的を達成するために、本発明のセラミックス製品
の製造方法は、セラミックス粉末を用いて成形体を成形
する工程と、得られた成形体を加熱するとともに成形圧
より小さな圧力で加圧して成形工程で成形体の表面部に
発生した欠陥凹凸部を取り除く工程と、成形体を焼結す
る工程とを具備することを特徴とするものである。[Configuration of the Invention (Means for Solving the Problem) In order to achieve the above object, the method for manufacturing a ceramic product of the present invention includes a step of molding a molded body using ceramic powder, and a process of molding a molded body using ceramic powder, and a process of molding a molded body using ceramic powder. It is characterized by comprising the steps of: heating and pressurizing with a pressure lower than the molding pressure to remove defective unevenness generated on the surface of the molded body during the molding process; and sintering the molded body. be.
すなわち、本発明のセラミックス製品の製造方法は、成
形工程で成形体の表面部に発生した欠陥凹凸部を修正し
て取り除く工程を設け、この工程において成形体を修正
型にセットして加熱して表面部を軟化させ、この状態で
成形体を成形圧力より低い圧力で加圧して成形体の表面
部を修正型の内面に沿って変形させることにより、成形
体の原形を崩すこと無く表面部の欠陥凹凸部を平坦な状
態に修正して取り除くものである。この工程にて成形体
の表面部の欠陥凹凸部を修正して取り除くことにより表
面部に欠陥凹凸部が存在しない成形体を得て、この成形
体を焼結して高い品質のセラミックス焼結体を作製する
ことができる。That is, the method for manufacturing a ceramic product of the present invention includes a step of correcting and removing defective irregularities generated on the surface of the molded object during the molding process, and in this step, the molded object is set in a correction mold and heated. By softening the surface part and applying pressure to the molded body in this state at a pressure lower than the molding pressure to deform the surface part of the molded body along the inner surface of the modified mold, the surface area can be changed without destroying the original shape of the molded body. This method corrects and removes defective uneven parts to a flat state. In this process, defective unevenness on the surface of the compact is corrected and removed to obtain a compact with no defective unevenness on the surface, and this compact is sintered to produce a high quality ceramic sintered body. can be created.
本発明のセラミックス製品の製造方法における成形工程
では、射出成形法、押し出し成形法、金型プレス法、そ
の他の成形方法により成形体を成形することが可能であ
るが、特に成形体の表面部に欠陥凹凸部が発生しやすい
成形方法、例えば射出成形法、押し出し成形法、その他
の成形方法で成形することを対象とすると効果的である
。In the molding step in the method for manufacturing ceramic products of the present invention, it is possible to mold the molded body by injection molding, extrusion molding, mold pressing, or other molding methods, but especially the surface part of the molded body It is effective to target molding using a molding method in which defective uneven portions are likely to occur, such as injection molding, extrusion molding, and other molding methods.
本発明のセラミックス製品の製造方法における成形体の
欠陥凹凸部を取り除く工程について説明を加える。A description will be added of the step of removing defective uneven portions of the molded body in the method for manufacturing a ceramic product of the present invention.
この工程を実施するに際しては成形体を修正型の内部に
セットする。修正型は、成形体の表面部の欠陥凹凸部に
接触する内面部分が成形体の欠陥凹凸部を変形させて平
坦面に修正できる状態であ・ることか必要である。この
条件を満たしているものであれば成形工程に使用した成
形型をそのまま利用することができ、また簡易な修正型
を用意しても良い。When carrying out this step, the molded body is set inside a modified mold. It is necessary for the correction mold to have an inner surface that comes into contact with the defective unevenness on the surface of the molded body, so that the defective unevenness of the molded body can be deformed and corrected into a flat surface. As long as this condition is met, the mold used in the molding process can be used as is, or a simple modified mold may be prepared.
成形体に対する加熱は、成形体の表面部が軟化して加圧
により修正型の内面に沿って変形し欠陥凹凸部が平坦な
状態になる温度で成形体を加熱する。この加熱温度の範
囲としては、成形体の原料粉末であるセラミックス粉末
に添加した有機バインダの軟化温度以上で分解温度未満
の間の範囲が好ましい。これは有機バインダの軟化温度
以下であると成形体の表面部が硬くて軟化しに＜＜、分
解温度を越えると脱脂工程と重なるからである。The molded body is heated to a temperature at which the surface portion of the molded body softens and is deformed along the inner surface of the correction mold by pressure, and the defective uneven portion becomes flat. The range of this heating temperature is preferably a range that is higher than the softening temperature of the organic binder added to the ceramic powder that is the raw material powder of the molded body and lower than the decomposition temperature. This is because if the temperature is below the softening temperature of the organic binder, the surface of the molded product will be hard and will not soften, and if it exceeds the decomposition temperature, the degreasing process will be repeated.
温度上昇速度や最高温度保持時間、冷却速度などの条件
は適宜設定する。Conditions such as temperature increase rate, maximum temperature holding time, cooling rate, etc. are set as appropriate.
成形体に対する加圧は、成形体を加熱してその表面部が
軟化した時に、成形体の表面部に存在する欠陥凹凸部が
修正型の内面に沿って変形し平坦な表面状態にさせるこ
とが可能な大きさの圧力で加圧する。成形体の原形を崩
すことを防止する意味も含めて、成形体の成形圧力より
低い圧力で加圧する。具体的には成形圧の１７２〜１１
５の圧力で加圧する。成形体を加圧する時点は、成形体
を加熱している時、あるいは成形体の加熱を終了して冷
却する時のいずれでも良いが、成形体の表面部の欠陥凹
凸部の変形が容易で変形後の形部れを防止できるという
意味で、加熱終了直後から加圧を開始することが良い。Pressure is applied to the molded product so that when the molded product is heated and its surface softens, the defective unevenness existing on the surface of the molded product is deformed along the inner surface of the correction mold and the surface becomes flat. Apply as much pressure as possible. Pressure is applied at a pressure lower than the molding pressure of the molded product, including the purpose of preventing the molded product from losing its original shape. Specifically, the molding pressure is 172 to 11.
Pressurize at a pressure of 5. The molded body may be pressurized either when the molded body is being heated or when the molded body has finished heating and is cooled down, but defects and irregularities on the surface of the molded body can easily deform and cause deformation. It is preferable to start pressurizing immediately after heating is completed, in the sense that later deformation can be prevented.
加圧速度および最大圧力保持時間、減圧速度などの条件
は適宜設定する。Conditions such as pressurization rate, maximum pressure holding time, and decompression rate are set as appropriate.
この工程で使用する設備は、修正型、加熱ヒータ、冷却
装置および加圧パンチを組み合わせるものが好ましいが
、全てを一猪に組み合わせず、夫々を適宜に組み合わせ
て〆使用しても良い。The equipment used in this step is preferably one that combines a modified type, a heater, a cooling device, and a pressurizing punch, but it is not necessary to combine all of them in one boar, and each may be appropriately combined for final use.
この工程を実施する場合には、成形体を修正型の内部に
セットし、加熱ヒータで成形体を加熱するとともに加圧
することにより、成形体の表面性に存在する欠陥凹凸部
を修正して取り除き、欠陥凹凸部が存在する成形体の表
面部の部分を平坦な状態にする。When carrying out this process, the molded body is set inside a correction mold, and the molded body is heated with a heater and pressurized to correct and remove the defective unevenness that exists on the surface of the molded body. , flatten the surface portion of the molded body where the defective uneven portion exists.
例えば射出成形法により成形した成形体の表面部には、
「ひけ」、「ウェルドライン」、「パーティングライン
」などの欠陥凹凸部が発生するが、成形体に対する加圧
および加熱によりこれらの欠陥凹凸部が修正型の内面に
沿って変形して崩れて取り除かれ平坦な面に修正される
。For example, on the surface of a molded product formed by injection molding,
Defects such as "sink marks", "weld lines", and "parting lines" occur, but due to pressure and heating on the molded product, these defective irregularities deform and collapse along the inner surface of the repair mold. It is removed and fixed to a flat surface.
この工程を実施する時点は、成形体に対して脱脂処理す
る工程の前の段階、後の段階、さらに脱脂工程と一緒、
に組み合わせて行うという３通りが可能であるが、巾で
も脱脂工程の前の段階に行うことが好ましい。This process is carried out at the stage before and after the process of degreasing the molded object, and also at the same time as the degreasing process.
Three methods are possible: performing this in combination with the above steps, but it is preferable to perform the step before the degreasing step.
この工程および脱脂工程を終えた後に成形体を焼結して
セラミックス焼結体を作製する。After completing this step and the degreasing step, the molded body is sintered to produce a ceramic sintered body.
なお、本発明のセラミックス製品の製造方法が対象とす
るセラミックス製品は、酸化物系セラミックスおよび非
酸化物系セラミックスのいずれで作製したものであって
も良い。セラミックス製品は用途を特定されず、種々の
用途に使用される種々の形状の製品も対象にできる。Note that the ceramic product to which the method for manufacturing a ceramic product of the present invention is directed may be made of either oxide-based ceramics or non-oxide-based ceramics. Ceramic products do not have specific uses, and can include products of various shapes used for various purposes.
（実施例）
以下、本発明の一実施例について図面を参照して説明す
る。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
窒化けい素粉末にワックス系の有機バインダを３０重量
％を添加し混合して射出成形材料を作製し、この材料を
成形型の内部に射出して第２図に示す円筒型をなす成形
体１を成形した。この成形体１の表面性にはウェルドラ
イン２が発生していた。An injection molding material is prepared by adding and mixing 30% by weight of a wax-based organic binder to silicon nitride powder, and this material is injected into the inside of a mold to form a cylindrical molded article 1 as shown in FIG. was molded. Weld lines 2 were generated on the surface of this molded body 1.
そこで、この成形体１を第１図に示す修正型３の内部に
セットした。この修正型３は円筒型をなすもので、その
上部および下部には夫々上パンチ４および下バンチ５を
組み合わせである。修正型３の周囲には電気ヒータ６と
冷却水パイプ７が巻回して配設しである。成形体１を修
正型３の内部にセットし、電気ヒータ６で成形体１を加
熱するとともに上バンチ４と下パンチ５とで成形体１を
加圧する。なお冷却水バイブ７は冷却水を流して修正型
３を冷却するものである。Therefore, this molded body 1 was set inside a modified mold 3 shown in FIG. This modified mold 3 has a cylindrical shape, and an upper punch 4 and a lower bunch 5 are combined at the upper and lower parts of the modified mold 3, respectively. An electric heater 6 and a cooling water pipe 7 are wound around the modified mold 3. The molded body 1 is set inside a correction mold 3, and while being heated by an electric heater 6, the molded body 1 is pressurized by an upper bunch 4 and a lower punch 5. Note that the cooling water vibrator 7 is used to cool the correction mold 3 by flowing cooling water.
この工程での条件は次の通りである。加熱温度は８０℃
である。加圧は加熱あるいは冷却に入ってから行い、２
００ｋｇｆ’／ｃｄで加圧した。この工程による成形体
１の表面部に存在していたウェルドライン２は取り除か
れ平坦に修正された。The conditions in this step are as follows. Heating temperature is 80℃
It is. Pressure is applied after heating or cooling, and
Pressure was applied at 00 kgf'/cd. The weld line 2 existing on the surface of the molded body 1 resulting from this step was removed and corrected to be flat.
その後、成形体を５５０℃まで加熱して脱脂を行った。Thereafter, the molded body was heated to 550°C to degrease it.
脱脂後に成形体を不活性雰囲気中、１７５０℃、３時間
の条件で加熱して焼結を行った。得られた焼結体を調べ
ると真円度が高く、表面部に凹凸部のない良好なもので
あった。After degreasing, the molded body was sintered by heating in an inert atmosphere at 1750° C. for 3 hours. When the obtained sintered body was examined, it was found to have high roundness and no unevenness on the surface.
［発明の効果］
以上説明したように本発明のセラミックス製品の製造方
法によれば、セラミックス成形体の表面部に発生した欠
陥凹凸部を容易且つ確実に取り除いて高い品質を有する
セラミックス製品を臀ることができる。[Effects of the Invention] As explained above, according to the method for manufacturing a ceramic product of the present invention, it is possible to easily and reliably remove defects and irregularities generated on the surface of a ceramic molded body, thereby producing a high quality ceramic product. be able to.
第１図は本発明のセラミックス製品の製造方法において
使用する修正型の概略的構成を示す図、第２図はセラミ
ックス製品の一例を示す図である。
２・・・修正型、３．４・・・パンチ、５・・・電気ヒ
ータ。FIG. 1 is a diagram showing a schematic configuration of a modified type used in the method of manufacturing a ceramic product of the present invention, and FIG. 2 is a diagram showing an example of the ceramic product. 2... Modified type, 3.4... Punch, 5... Electric heater.
Claims (2)
と、得られた成形体を加熱するとともに前記成形工程で
の成形圧より小さな圧力で加圧して前記成形工程で成形
体の表面部に発生した欠陥凹凸部を取り除く工程と、成
形体を焼結する工程とを具備することを特徴とするセラ
ミックス製品の製造方法。(1) The process of molding a molded body using ceramic powder, heating the obtained molded body, and applying pressure at a pressure lower than the molding pressure in the molding process, whereby generation occurs on the surface of the molded body in the molding process. A method for manufacturing a ceramic product, comprising the steps of: removing defective uneven portions; and sintering a molded body.
の成形体に含まれる有機バインダの軟化温度以上で有機
バインダの分解温度未満の範囲の温度で成形体を加熱す
る請求項１記載のセラミックス製品の製造方法。(2) The ceramic product according to claim 1, wherein in the step of removing defective uneven portions of the molded body, the molded body is heated at a temperature in a range of at least the softening temperature of the organic binder contained in the molded body and below the decomposition temperature of the organic binder. manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22539889A JPH0387208A (en) | 1989-08-31 | 1989-08-31 | Manufacture of ceramic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22539889A JPH0387208A (en) | 1989-08-31 | 1989-08-31 | Manufacture of ceramic product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0387208A true JPH0387208A (en) | 1991-04-12 |
Family
ID=16828738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22539889A Pending JPH0387208A (en) | 1989-08-31 | 1989-08-31 | Manufacture of ceramic product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0387208A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1125702A3 (en) * | 2000-02-16 | 2002-09-18 | Howmet Research Corporation | Method and apparatus for making ceramic cores and other articles |
| JP2004338363A (en) * | 2003-04-22 | 2004-12-02 | Kyocera Corp | Method for molding ceramic powder |
| JP2009096040A (en) * | 2007-10-16 | 2009-05-07 | Ube Ind Ltd | Continuous construction method using hydraulic mortar, and its structure |
| JP2009096039A (en) * | 2007-10-16 | 2009-05-07 | Ube Ind Ltd | Construction method of hydraulic mortar and its structure |
-
1989
- 1989-08-31 JP JP22539889A patent/JPH0387208A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1125702A3 (en) * | 2000-02-16 | 2002-09-18 | Howmet Research Corporation | Method and apparatus for making ceramic cores and other articles |
| JP2004338363A (en) * | 2003-04-22 | 2004-12-02 | Kyocera Corp | Method for molding ceramic powder |
| JP2009096040A (en) * | 2007-10-16 | 2009-05-07 | Ube Ind Ltd | Continuous construction method using hydraulic mortar, and its structure |
| JP2009096039A (en) * | 2007-10-16 | 2009-05-07 | Ube Ind Ltd | Construction method of hydraulic mortar and its structure |
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