JPH0199809A - Extrusion molder - Google Patents
Extrusion molderInfo
- Publication number
- JPH0199809A JPH0199809A JP62258034A JP25803487A JPH0199809A JP H0199809 A JPH0199809 A JP H0199809A JP 62258034 A JP62258034 A JP 62258034A JP 25803487 A JP25803487 A JP 25803487A JP H0199809 A JPH0199809 A JP H0199809A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- liner
- liners
- molded
- ptc
- 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
- 238000001125 extrusion Methods 0.000 title claims description 31
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 239000012778 molding material Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 abstract description 8
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 abstract description 2
- 239000004927 clay Substances 0.000 description 10
- 238000010304 firing Methods 0.000 description 10
- 239000004065 semiconductor Substances 0.000 description 6
- 238000004898 kneading Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 229910002113 barium titanate Inorganic materials 0.000 description 4
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 235000012438 extruded product Nutrition 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は正特性サーミスタやコンデンサ等のセラミック
材料を成形する押出し成形機に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an extrusion molding machine for molding ceramic materials such as positive temperature coefficient thermistors and capacitors.
（従来の技術）
一般に、正特性サーミスタ等の半導体磁器材料を押出し
成形する場合、半導体磁器材料粉末、バインダおよび水
を予め所定の比率で混合してなるセラミック原料を、真
空土練機等の土練機で混練、脱気して坏土を形成し、こ
の坏土を第３図に示すような２段式の真空押出し成形機
で所定の形状に成形している。(Prior art) Generally, when extrusion molding a semiconductor porcelain material such as a positive temperature coefficient thermistor, a ceramic raw material prepared by mixing a semiconductor porcelain material powder, a binder, and water in a predetermined ratio is used in a vacuum clay kneading machine or the like. A clay is formed by kneading and degassing in a kneading machine, and this clay is molded into a predetermined shape using a two-stage vacuum extrusion molding machine as shown in FIG.
上記真空押出し成形機は、上段押出し部２と下段押出し
部１２との間に真空室１３が設けられ、坏土投入口１４
に投入された坏土（図示せず。）は、シリンダ１５の内
部に１本ないし２本のスクリュ１６を配した上段押出し
部１１から、真空室１３に押し出されて脱気される。脱
気された坏土は、真空室１３の底部に設けられたローラ
１７で圧縮された後、シリンダ１８の内部に１本のスク
リュ１９を配した下段押出し部１２に供給され、口金２
０から坏土が所定の形状に成形されて押し出される。上
記上段押出し部１１のシリンダ１５の外枠１５ａおよび
下段押出し部１２のシリンダ１８の外枠１８ａの内側に
はライナ１５ｂおよびｔａｂが固定される。これらライ
ナ１５ｂおよび１８ｂはいずれも、ステンレスもしくは
窒化鋼からなるもので、ライナ１５ｂとシリンダ１５の
外枠１５ａとの間、およびライナ１８ｂとシリンダ１８
の外枠１８ａとの間に冷却水が流される。また、上記上
段押出し部１１のスクリュＩ６および下段押出し部１２
のスクリュ１９ら、ステンレスもしくは窒化鋼からなる
。The vacuum extrusion molding machine has a vacuum chamber 13 provided between the upper extrusion section 2 and the lower extrusion section 12, and a clay input port 14.
The clay (not shown) introduced into the cylinder 15 is pushed out into the vacuum chamber 13 from the upper extrusion section 11 in which one or two screws 16 are disposed inside the cylinder 15, and is degassed. After the degassed clay is compressed by a roller 17 provided at the bottom of the vacuum chamber 13, it is supplied to the lower extrusion section 12, which has one screw 19 inside a cylinder 18, and is then passed through the base 2.
Starting from scratch, clay is formed into a predetermined shape and extruded. A liner 15b and a tab are fixed inside the outer frame 15a of the cylinder 15 of the upper extrusion section 11 and the outer frame 18a of the cylinder 18 of the lower extrusion section 12. These liners 15b and 18b are both made of stainless steel or nitrided steel, and are arranged between the liner 15b and the outer frame 15a of the cylinder 15, and between the liner 18b and the cylinder 18.
Cooling water is flowed between the outer frame 18a and the outer frame 18a. In addition, the screw I6 of the upper extrusion section 11 and the lower extrusion section 12
The screws 19 and the like are made of stainless steel or nitrided steel.
ところで、上記のような押出し成形機では、スクリュ１
６および１９により、上段押出し部１１および下段押出
し部１２にて坏土が混練されつつシリンダ１５および１
８内を移送される際に、ライナ１５ｂ、１８ｂおよびス
クリュ１６．１９が削られ、それが鉄（Ｆｅ）やクロム
（Ｃｒ）の不純物となって坏土に混入し、製品の品質に
悪影響を与えるという問題があった。このため、スクリ
ュ１６および１９については、樹脂製のものに置き換え
られてきたが、ライナ１５ｂおよび１８ｂは、その強度
キ外周部に冷却水が流れる関係上、金属から樹脂に変え
ることができず、最善のものとして、上記のように、ス
テンレスや窒化鋼が使用されてきた。By the way, in the extrusion molding machine as described above, the screw 1
6 and 19, the clay is kneaded in the upper extrusion section 11 and the lower extrusion section 12 while the cylinders 15 and 1
8, the liners 15b, 18b and screws 16 and 19 are scraped, which becomes iron (Fe) and chromium (Cr) impurities that mix into the clay and adversely affect the quality of the product. There was a problem of giving. For this reason, the screws 16 and 19 have been replaced with ones made of resin, but the liners 15b and 18b cannot be changed from metal to resin due to their strength and the flow of cooling water around their outer peripheries. Best of all, as mentioned above, stainless steel or nitrided steel has been used.
しかし、正特性サーミスタの原料坏土を混練して成形す
る場合、上記ライナ１５ｂおよび１８ｂの摩耗による不
純物の混入により、製品となった正特性サーミスタの比
抵抗が大幅に上がるという問題があった。However, when kneading and molding the raw clay of a PTC thermistor, there is a problem in that the specific resistance of the PTC thermistor as a product increases significantly due to the contamination of impurities due to wear of the liners 15b and 18b.
（発明の目的）
本発明の目的は、正特性サーミスタやコンデンサ等のセ
ラミック材料を押出し成形するに際して、シリンダのラ
イナの摩耗による不純物が混入するのを防止し、良好な
特性を有する成形品を得ることのできる押出し成形機を
提供することである。(Objective of the Invention) The object of the present invention is to prevent impurities from being mixed in due to wear of the cylinder liner when extruding ceramic materials such as positive temperature coefficient thermistors and capacitors, and to obtain molded products with good characteristics. The object of the present invention is to provide an extrusion molding machine that can
（発明の構成）
このため、本発明は、スクリュが内部で回転駆動されて
成形材料が混練されつつ軸方向に移送されるシリンダは
、その内壁を構成しているライナが超硬材料からなって
いることを特徴としている。(Structure of the Invention) Therefore, the present invention provides a cylinder in which a screw is rotationally driven inside and the molding material is kneaded and transferred in the axial direction, and the liner forming the inner wall of the cylinder is made of a superhard material. It is characterized by the presence of
上記ライナは超硬材料からなるものであるので、スクリ
ュの回転により成形材料が混練される際に上記ライナが
摩耗することがない。よって、押出し成形中にライナか
ら成形材料中への不純物の混入はなくなる。Since the liner is made of a superhard material, the liner does not wear out when the molding material is kneaded by the rotation of the screw. Therefore, contamination of impurities from the liner into the molding material during extrusion is eliminated.
（発明の効果）
本発明によれば、押出し成形中にライナから成、 形材
料中への不純物の混入がなくなるので、押出し成形品の
成分の変化がなく、品質が良好で、特性のばらつきのな
いセラミック材料を得ることができる。(Effects of the Invention) According to the present invention, since there is no contamination of impurities into the molded material formed from the liner during extrusion molding, there is no change in the components of the extruded product, the quality is good, and there is no variation in properties. No ceramic material can be obtained.
（実施例） 以下、添付の図面を参照して本発明の詳細な説明する。(Example) Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
既に、第３図において説明したように、押出し成形機は
、上段押出し部２のシリンダ１５の外枠１５ａの内側に
はライナ１５ｂが固定されており、また、第１図に縦断
面を、第２図にその■−■線に沿う断面を夫々示すよう
に、下段押出し部１２のシリンダ１８の外枠１８ａの内
側にも、ライナｔａｂが固定されている。As already explained in FIG. 3, in the extrusion molding machine, the liner 15b is fixed inside the outer frame 15a of the cylinder 15 of the upper extrusion section 2. A liner tab is also fixed inside the outer frame 18a of the cylinder 18 of the lower extruded portion 12, as shown in FIG.
本発明では、上記ライナ１５ｂおよび１８ｂを、たとえ
ばタングステンカーバイド系の超硬材料により形成する
。In the present invention, the liners 15b and 18b are formed of, for example, a tungsten carbide-based superhard material.
このように、ライナ１５ｂおよび１８ｂを超硬材料によ
り形成しておけば、セラミック材料がシリンダ１５およ
び１８中で混練され、成形される過程で、上記ライナ１
５ｂおよび１８ｂが摩耗して削られ、それがセラミック
材料中に不純物として混入することはない。これにより
、押出し成形品の成分の変化がなくなる。In this way, if the liners 15b and 18b are made of a superhard material, in the process of kneading and molding the ceramic material in the cylinders 15 and 18, the liner
5b and 18b are worn away and are not mixed into the ceramic material as impurities. This eliminates changes in the components of the extruded product.
次に、本発明に係る押出し成形機および従来の押出し成
形機により、正特性サーミスタを製造した実験例につい
て説明する。Next, an experimental example in which a positive temperature coefficient thermistor was manufactured using an extrusion molding machine according to the present invention and a conventional extrusion molding machine will be described.
［実験例１］
チタン酸バリウム半導体粉末を、シリンダ１５および１
８のライナ１５ｂおよび１８ｂを超硬化した押出し成形
機にて、長さ１０ｍｍ、径３ 、０ ｍｍの成形品Ａを
成形した。[Experiment Example 1] Barium titanate semiconductor powder was placed in cylinders 15 and 1.
A molded article A having a length of 10 mm and a diameter of 3.0 mm was molded using an extrusion molding machine in which the liners 15b and 18b of No. 8 were super hardened.
同様に、上記チタン酸バリウム半導体粉末を、シリンダ
Ｉ５および１８のライナ１５ｂおよび１８ｂが窒化鋼か
らなる従来の押出し成形機にて、長さ１０ｉｘ、径３．
Ｏｕの成形品Ｂを成形した。Similarly, the barium titanate semiconductor powder was molded into cylinders I5 and 18 with liners 15b and 18b made of nitrided steel using a conventional extrusion machine having a length of 10 ix and a diameter of 3.
A molded article B of Ou was molded.
そして、この２種類の成形品ＡおよびＢを、同一の焼成
炉にて、１３５０℃で１時間焼成後、１時間当たり２０
０℃で降温する焼成カーブで焼成し、その両端面にＩｎ
Ｇａ電極を形成することにより、夫々正特性サーミスタ
ＰＴＣ−ＡおよびＰＴＣ−Ｂを得た。After firing these two types of molded products A and B at 1350°C for 1 hour in the same firing furnace,
Firing is performed using a firing curve that lowers the temperature at 0℃, and In is applied to both end surfaces of the firing curve.
By forming Ga electrodes, positive temperature coefficient thermistors PTC-A and PTC-B were obtained, respectively.
これら正特性サーミスタＰＴＣ−ＡおよびＰＴＣ−Ｂ各
５０個のサンプルについて、抵抗値、比抵抗および抵抗
−温度特性を測定したところ、次の第１表に示すような
結果を得た。When the resistance value, specific resistance, and resistance-temperature characteristics of 50 samples each of these positive temperature coefficient thermistors PTC-A and PTC-B were measured, the results shown in Table 1 below were obtained.
第１表
注：抵抗、比抵抗は各サンプル５０の平均値上記第１表
から、正特性サーミスタＰＴＣ−Ａは、正特性サーミス
タＰＴＣ−Ｈに比較して、抵抗値、゛比抵抗ともに小さ
く、抵抗−温度特性のばらつきが小さくなっていること
が分る。Table 1 Note: Resistance and specific resistance are average values for each sample 50 From Table 1 above, the positive temperature coefficient thermistor PTC-A has a smaller resistance value and specific resistance than the positive coefficient thermistor PTC-H. It can be seen that the variation in resistance-temperature characteristics has become smaller.
［実験例２コ
実験例１で使用したチタン酸バリウム半導体粉末とは異
なる組成を有するチタン酸バリウム半導体粉末を、シリ
ンダ１５および１８のライナ１５ｂおよび１８ｂを超硬
化した押出し成形機にて、長さｌ０ｍｍ、径３ 、０１
１１Ｋの成形品Ｃを成形した。[Experimental Example 2] Barium titanate semiconductor powder having a composition different from that used in Experimental Example 1 was molded using an extrusion molding machine in which liners 15b and 18b of cylinders 15 and 18 were super hardened. l0mm, diameter 3, 01
A molded article C of 11K was molded.
同様に、上記チタン酸バリウム半導体粉末を、シリンダ
１５およびＩ８のライナ１５ｂおよび１８ｂが窒化鋼か
らなる従来の押出し成形機にて、長さＩＯｘｍ、径３
、０ ｍｍの成形品りを成形した。Similarly, the barium titanate semiconductor powder was molded into a conventional extrusion molding machine with a length IOxm and a diameter of 3
, 0 mm molded products were molded.
そして、この２種類の成形品Ｃ押よびＤを、同一の焼成
炉にて、１３２０℃で１時間焼成後、１時間当たり２５
０℃で降温する焼成カーブで焼成し、その両端面にＩｎ
Ｇａ電極を形成することにより、夫々正特性サーミスタ
ＰＴＣ−ＣおよびＰＴＣ−Ｄを得た。After firing these two types of molded products C and D in the same firing furnace at 1320°C for 1 hour,
Firing is performed using a firing curve that lowers the temperature at 0℃, and In is applied to both end surfaces of the firing curve.
By forming Ga electrodes, positive temperature coefficient thermistors PTC-C and PTC-D were obtained, respectively.
これら正特性サーミスタＰＴＣ−ＣおよびＰＴＣ−Ｄ各
５０個の与ンプルについて、抵抗値、比抵抗および抵抗
−温度特性を測定したところ、次の第２表に示すような
結果を得た。The resistance value, specific resistance, and resistance-temperature characteristics of each of 50 positive temperature coefficient thermistors PTC-C and PTC-D were measured, and the results shown in Table 2 below were obtained.
第２表
注：抵抗、比抵抗は各サンプル５０の平均値上記第２表
から、正特性サーミスタＰＴＣ−Ａは、正特性サーミス
タＰＴＣ−Ｈに比較して、抵抗値、比抵抗ともに小さく
、抵抗−温度特性のばらつきが小さくなっていることが
分かる。Table 2 Note: Resistance and specific resistance are the average values of each sample 50 From Table 2 above, the positive temperature coefficient thermistor PTC-A has a smaller resistance value and specific resistance than the positive coefficient thermistor PTC-H, and the resistance - It can be seen that the variation in temperature characteristics has become smaller.
本発明は、セラミック誘電体、セラミック圧電体、ある
いはフェライト等の磁性体の押出し成形機にも適用する
ことができる。The present invention can also be applied to an extrusion molding machine for ceramic dielectrics, ceramic piezoelectrics, or magnetic materials such as ferrite.
第１図は本発明に係る押出し成形機の縦断面図、第２図
は第１図の■−■線に沿う断面図、第３図は押出し成形
機の一般的な構成を示す縦断面図である。
１５・・・シ１ルダ（１５ａ・・・外枠、１５ｂ・・・
ライナ）、１６・・・スクリュ、
１８・・・シリンダ（１８ａ・・・外枠、１８ｂ・・・
ライナ）、１９・・・スクリュ。
特許出願人 株式会社村田製作所Fig. 1 is a longitudinal sectional view of an extrusion molding machine according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a longitudinal sectional view showing the general configuration of the extrusion molding machine. It is. 15...Cylinder (15a...Outer frame, 15b...
liner), 16... screw, 18... cylinder (18a... outer frame, 18b...
Raina), 19...screw. Patent applicant Murata Manufacturing Co., Ltd.
Claims (1)
クリュとを備え、このスクリュによって上記シリンダ内
を成形材料が混練されつつ軸方向に移送され、上記シリ
ンダの先端の成形部にて所要の形状に成形される押出し
成形機において、上記シリンダの内壁を構成しているラ
イナは超硬材料からなっていることを特徴とする押出し
成形機。(1) It is equipped with a cylinder and a screw that is rotationally driven within the cylinder, and the molding material is kneaded and transferred in the axial direction inside the cylinder by the screw, and the molding material is molded into the desired shape at the molding part at the tip of the cylinder. 1. An extrusion molding machine for molding, wherein the liner forming the inner wall of the cylinder is made of a superhard material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62258034A JPH0199809A (en) | 1987-10-12 | 1987-10-12 | Extrusion molder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62258034A JPH0199809A (en) | 1987-10-12 | 1987-10-12 | Extrusion molder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0199809A true JPH0199809A (en) | 1989-04-18 |
Family
ID=17314617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62258034A Pending JPH0199809A (en) | 1987-10-12 | 1987-10-12 | Extrusion molder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0199809A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030049868A (en) * | 2001-12-17 | 2003-06-25 | 구재완 | The manufacturing apparatus of loess construction material and the loess construction material thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56154021A (en) * | 1980-04-30 | 1981-11-28 | Asahi Glass Co Ltd | Die for honeycomb extrusion molding and its manufacture |
| JPS5933128A (en) * | 1982-08-19 | 1984-02-22 | Hitachi Metals Ltd | Cylinder for injection molder and extruder |
| JPS61241105A (en) * | 1985-04-18 | 1986-10-27 | 株式会社ノリタケカンパニーリミテド | Screw type extruding machine or kneading machine |
-
1987
- 1987-10-12 JP JP62258034A patent/JPH0199809A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56154021A (en) * | 1980-04-30 | 1981-11-28 | Asahi Glass Co Ltd | Die for honeycomb extrusion molding and its manufacture |
| JPS5933128A (en) * | 1982-08-19 | 1984-02-22 | Hitachi Metals Ltd | Cylinder for injection molder and extruder |
| JPS61241105A (en) * | 1985-04-18 | 1986-10-27 | 株式会社ノリタケカンパニーリミテド | Screw type extruding machine or kneading machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030049868A (en) * | 2001-12-17 | 2003-06-25 | 구재완 | The manufacturing apparatus of loess construction material and the loess construction material thereof |
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