JPH02265703A - Injection molding method - Google Patents
Injection molding methodInfo
- Publication number
- JPH02265703A JPH02265703A JP8581689A JP8581689A JPH02265703A JP H02265703 A JPH02265703 A JP H02265703A JP 8581689 A JP8581689 A JP 8581689A JP 8581689 A JP8581689 A JP 8581689A JP H02265703 A JPH02265703 A JP H02265703A
- Authority
- JP
- Japan
- Prior art keywords
- viscosity
- dry body
- injection
- injection molding
- making
- 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
- 238000001746 injection moulding Methods 0.000 title claims abstract description 17
- 239000000919 ceramic Substances 0.000 claims abstract description 14
- 238000000465 moulding Methods 0.000 claims abstract description 11
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 239000004927 clay Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 4
- 239000000843 powder Substances 0.000 abstract description 3
- 229910010293 ceramic material Inorganic materials 0.000 abstract 2
- -1 polyethylene Polymers 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 3
- 239000004014 plasticizer Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 235000021355 Stearic acid Nutrition 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 229910052575 non-oxide ceramic Inorganic materials 0.000 description 2
- 239000011225 non-oxide ceramic Substances 0.000 description 2
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 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
Landscapes
- Producing Shaped Articles From Materials (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は射出成形方法、特にセラミックス原料坏土を真
空下に射出成形するに際し、泡の巻き込みを極力少なく
し得る方法に係るものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an injection molding method, and particularly to a method that can minimize the inclusion of bubbles when injection molding ceramic raw material clay under vacuum.
［従来の技術］
セラミックスの成形手段は種々提案され、又実施されて
いるが、とりわけ精密かつ複雑な形状の成形には射出成
形が採用される。[Prior Art] Various methods for molding ceramics have been proposed and implemented, and injection molding is particularly used for molding precise and complicated shapes.
とりわけ、高温・構造材料として使用される非酸化物系
セラミックスの成形体は精密且複雑な形状となる場合が
多く、このような成形方法として真空下における射出成
形が最適とされている。In particular, molded bodies of non-oxide ceramics used as high-temperature/structural materials often have precise and complicated shapes, and injection molding under vacuum is considered to be the optimal molding method for such molding.
かかる成形法にあっては、成形体中に欠陥が生じない為
に種々の添加剤を添加したり、射出成形法自体を改良し
たりすることが行なわれている。In such molding methods, various additives are added or the injection molding method itself is improved in order to prevent defects from occurring in the molded product.
［発明の解決しようとする課題］
しかしながら、これら従来法にあっては、確かに射出成
形に供されるセラミックス原料坏土自体の性質を改善せ
しめることはできるが、実際の射出成形に際しては、真
空下に成形を行なうにも拘らず、大気中の空気を多少な
りとも巻き込み、これが成形品中に泡乃至空洞として残
留し、この部分が欠陥部となってしまう欠点を有してい
た。[Problems to be Solved by the Invention] However, although these conventional methods can certainly improve the properties of the ceramic raw material clay itself used for injection molding, it is difficult to perform vacuum injection molding during actual injection molding. Even though the molding is carried out at the bottom, some air from the atmosphere is drawn in, which remains in the molded product as bubbles or cavities, resulting in defects in these areas.
［課題を解決しようとする為の手段］
本発明者は、上記欠点を排除すべく、かかる成形時にお
ける泡の巻き込みを極力避は得る手段を見出すことを目
的として種々研究、検討した結果、射出成形に供される
セラミックス原料坏土の粘度を特定な範囲とすることに
よりほぼ一義的に前記目的を達成し得ることを見出した
。[Means for Solving the Problems] In order to eliminate the above-mentioned drawbacks, the present inventor conducted various research and examinations with the aim of finding a means to avoid entrainment of bubbles during molding as much as possible. It has been found that the above object can be almost uniquely achieved by adjusting the viscosity of the ceramic raw material clay used for molding to a specific range.
かくして本発明は、セラミックス原料坏土を真空下に射
出成形するに際し、原料坏土の粘度を１０’ ＮｌＯ”
５ｅｃ−’の剪断速度において１０２ 〜１０’ボイス
に調整せしめておくことを特徴とする射出成形方法を提
供するにある。Thus, in the present invention, when injection molding the raw material clay for ceramics under vacuum, the viscosity of the raw material clay is reduced to 10'NlO''.
An object of the present invention is to provide an injection molding method characterized in that the shear rate is adjusted to 102 to 10' voices at a shear rate of 5 ec-'.
本発明において原料坏土の粘度が前記範囲に満たない場
合には可塑剤や滑剤等の揮発による発泡が多くなり、逆
に前記範囲を超える場合には金型の形状、寸法を忠実に
転写できず、必要とする寸法精度を満足できなくなるの
で何れも不適当である。In the present invention, if the viscosity of the raw clay is less than the above range, foaming will increase due to volatilization of plasticizers, lubricants, etc., whereas if it exceeds the above range, the shape and dimensions of the mold may not be faithfully transferred. First, both are inappropriate because the required dimensional accuracy cannot be satisfied.
そしてこれら範囲のうち、ｌＯ１〜１０’ボイスを採用
する場合には、可塑剤や滑剤の発泡を実質的に防止し得
るので特に好ましい、実際、原料坏土の粘度を前記範囲
に調整せしめる手段としては種々の方法を採用し得る０
例えば、原料坏土の温度を制御したり、セラミックス粉
末の濃度を５０〜５５容量％程度に調整したり、バイン
ダーとなるポリエチレンやポリスチレン等の高分子融液
の粘度を調整し、たり、フタル酸エステルや脂肪酸エス
テル等の可塑剤やステアリン酸、ステアリルアルコール
、ステアリン酸エステル等の滑剤の添加量を制御したり
、更にはこれらの組み合わせにより坏土が本発明の所定
粘度になるように調整せしめる。Among these ranges, it is particularly preferable to use lO1 to 10'voice because it can substantially prevent foaming of the plasticizer or lubricant. can adopt various methods 0
For example, controlling the temperature of raw clay, adjusting the concentration of ceramic powder to about 50 to 55% by volume, adjusting the viscosity of polymer melt such as polyethylene or polystyrene that serves as a binder, and By controlling the amount of plasticizers such as esters and fatty acid esters, and lubricants such as stearic acid, stearyl alcohol, and stearic acid esters, or by combining these, the clay is adjusted to have the predetermined viscosity of the present invention.
又、所定粘度に調整されたセラミックス坏土は、射出成
形に供されるが、このときシリンダーノズルの温度を１
３０〜２００℃とし、又金型温度を２０〜９０℃として
射出成形を実施すると成形形状に関係なく本発明の目的
を達成し得るので好ましい。Furthermore, the ceramic clay adjusted to a predetermined viscosity is subjected to injection molding, but at this time the temperature of the cylinder nozzle is lowered to 1.
It is preferable to perform injection molding at a temperature of 30 to 200°C and a mold temperature of 20 to 90°C, since the object of the present invention can be achieved regardless of the molded shape.
なお、この際射出速度は４０〜５０ｃｍ”／ｓｅｃ 、
射出保持圧力３７０〜１５００ｋｇ／ｃｍ”を採用する
のが適当である。In addition, the injection speed at this time is 40 to 50 cm"/sec,
It is appropriate to adopt an injection holding pressure of 370 to 1500 kg/cm.
本発明が適用されるセラミックスとしては特に制限はな
く、例えば窒化珪素、炭化珪素、窒化アルミニウム等の
非酸化物系セラミックス、アルミナ、ジルコニア等が挙
げられるが、とりわけ非酸化物系セラミックスの成形に
は最適である６本発明方法が適用されるセラミックス原
料中には、その池水発明の目的を阻害しない限り、適宜
な添加物、例えば金属粉末やウィスカー等を添加するこ
とができる。The ceramics to which the present invention is applied are not particularly limited, and include, for example, non-oxide ceramics such as silicon nitride, silicon carbide, and aluminum nitride, alumina, and zirconia. 6. Appropriate additives such as metal powders and whiskers can be added to the ceramic raw material to which the method of the present invention is applied, as long as they do not impede the purpose of the invention.
［実施例］
比表面積１７ｒｒｒ／ｇを有する炭化珪素８０重量％、
ポリエチレン５重量％、ポリエチレン５重量％、ステア
リン酸１重置％、脂肪酸エステル４重量％とを常温下に
十分混線せしめることによりｌＯ１〜１０２ｓｅｃ””
の剪断速度において粘度が１０２〜１０’ボイスのセラ
ミックス坏土を得た。[Example] 80% by weight of silicon carbide having a specific surface area of 17rrr/g,
By sufficiently mixing 5% by weight of polyethylene, 5% by weight of polyethylene, 1% by weight of stearic acid, and 4% by weight of fatty acid ester at room temperature, 10 to 102 sec.
A ceramic clay having a viscosity of 102 to 10'voice was obtained at a shear rate of .
かかる坏土な１５０℃に加熱された口径６ｍｍのシリン
ダーノズル（射出ノズル）から、外径１５０ａ＋ｓ 、
容積３２０ｃｃの８０℃に保持された円板状金型キャビ
ティー内に真空下に射出し、成形を行なった。From a cylinder nozzle (injection nozzle) with a diameter of 6 mm heated to 150 ° C., an outer diameter of 150 a + s,
Molding was performed by injecting under vacuum into a disc-shaped mold cavity having a volume of 320 cc and maintained at 80°C.
この成形体は目視による表面の泡及びＸ線による内部の
泡は何れも認められなかった。In this molded article, neither bubbles on the surface nor bubbles inside were observed by X-ray observation.
Claims (1)
し、原料坏土の粘度を１０＾１〜１０＾３ｓｅｃ＾−＾
１の剪断速度において、１０＾１〜１０＾４ポイズに調
整せしめておくことを特徴とする射出成形方法。 ２、セラミックス原料坏土を真空下に射出成形するに際
し、原料坏土の粘度を１０＾−＾１〜１０＾３ｓｅｃ＾
−＾１の剪断速度において１０＾２〜１０＾４ポイズに
調整し、シリンダーノズルの温度を１３０〜２００℃に
、金型温度を２０〜９０℃に調整しつつ射出することを
特徴とする射出成形方法。[Claims] 1. When injection molding the ceramic raw material clay under vacuum, the viscosity of the raw material clay is set to 10^1 to 10^3 sec^-^
An injection molding method characterized in that the shear rate is adjusted to 10^1 to 10^4 poise at a shear rate of 1. 2. When injection molding ceramic raw material clay under vacuum, the viscosity of raw material clay is 10^-^1~10^3sec^
- Injection characterized by adjusting the shear rate to 10^2 to 10^4 poise at a shear rate of ^1, and injecting while adjusting the temperature of the cylinder nozzle to 130 to 200 °C and the temperature of the mold to 20 to 90 °C. Molding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1085816A JPH0675855B2 (en) | 1989-04-06 | 1989-04-06 | Injection molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1085816A JPH0675855B2 (en) | 1989-04-06 | 1989-04-06 | Injection molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02265703A true JPH02265703A (en) | 1990-10-30 |
| JPH0675855B2 JPH0675855B2 (en) | 1994-09-28 |
Family
ID=13869382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1085816A Expired - Lifetime JPH0675855B2 (en) | 1989-04-06 | 1989-04-06 | Injection molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0675855B2 (en) |
-
1989
- 1989-04-06 JP JP1085816A patent/JPH0675855B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0675855B2 (en) | 1994-09-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |