JPH0261793B2 - - Google Patents
Info
- Publication number
- JPH0261793B2 JPH0261793B2 JP18915085A JP18915085A JPH0261793B2 JP H0261793 B2 JPH0261793 B2 JP H0261793B2 JP 18915085 A JP18915085 A JP 18915085A JP 18915085 A JP18915085 A JP 18915085A JP H0261793 B2 JPH0261793 B2 JP H0261793B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molding
- heat generating
- view
- cavity
- 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
Links
- 238000000465 moulding Methods 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 229910010293 ceramic material Inorganic materials 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000010292 electrical insulation Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 19
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 16
- 239000002245 particle Substances 0.000 description 10
- 229910016006 MoSi Inorganic materials 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Landscapes
- Resistance Heating (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、デイーゼルエンジン、あるいは暖房
用燃焼器等に用いられるセラミツクヒータに関
し、詳細にはその製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ceramic heater used in a diesel engine, a heating combustor, etc., and specifically relates to a manufacturing method thereof.
従来、セラミツクヒータの製造方法としては、
例えば特開昭59−8293号公報に記載されたものが
ある。
Traditionally, the manufacturing method for ceramic heaters is as follows:
For example, there is one described in JP-A-59-8293.
これは導電性を有するセラミツク材料をシート
に成形し、各シートを所定形状に打抜き、これら
を積層するとともに積層シート間に電極を挟み、
全体をホツトプレスで焼成する方法である。 This involves forming conductive ceramic material into sheets, punching each sheet into a predetermined shape, laminating these sheets, and sandwiching electrodes between the laminated sheets.
This is a method in which the entire product is fired using a hot press.
上記従来例ではシート成形、打抜、積層という
ように著しく工数がかかるうえにシートの厚さ管
理が困難であり、良好な寸法精度が得られない。
In the conventional example described above, sheet forming, punching, and lamination require a considerable number of man-hours, and it is difficult to control the thickness of the sheet, making it impossible to obtain good dimensional accuracy.
本発明は、成形型内に一対の電極を互いに離間
して並置し、一対の電極の一端側が露出する、成
形型内の発熱部成形用キヤビテイー内、ならびに
該電極の一端側を除く他の領域が露出する、成形
型内の絶縁部成形用キヤビテイー内に、各々導電
性を有するセラミツク材料を包含した発熱部材
料、電気絶縁性を有するセラミツク材料を包含し
た絶縁部材料を射出成形し、発熱部および絶縁部
を前記電極に一体的に結合するものである。
The present invention provides a method for disposing a pair of electrodes spaced apart from each other in a mold, and exposing one end side of the pair of electrodes in a cavity for molding a heat generating part in the mold, as well as other areas other than the one end side of the electrodes. A heat generating part material containing a ceramic material having conductivity and an insulating part material containing a ceramic material having electrical insulation properties are respectively injection molded into the cavity for molding the insulation part in the mold, which exposes the heat generating part. and an insulating portion integrally coupled to the electrode.
本発明によれば、各材料を射出成形するため、
比較的複雑な形状であつても精度よく低コストで
製造できる。
According to the present invention, in order to injection mold each material,
Even relatively complex shapes can be manufactured with high precision and at low cost.
従つて、本発明は従来に比べて製造工数を著し
く低減でき、かつ寸法精度を高くできるという優
れた効果を奏する。
Therefore, the present invention has excellent effects in that the number of manufacturing steps can be significantly reduced and the dimensional accuracy can be increased compared to the conventional method.
以下本発明を具体的実施例により詳細に説明す
る。
The present invention will be explained in detail below using specific examples.
まず、第１図に示すデイーゼルエンジン用セラ
ミツクグロープラグの発熱体について説明する。 First, the heating element of the ceramic glow plug for diesel engines shown in FIG. 1 will be explained.
１は平均粒径0.9μｍのMoSi230モル％と平均粒
径3.5μｍのSi3N470モル％との混合物を焼結して
成る発熱部であり、断面Ｕ字形状に成形してあ
る。 1 is a heat generating part made by sintering a mixture of 30 mol% MoSi 2 with an average particle size of 0.9 μm and 70 mol% Si 3 N 4 with an average particle size of 3.5 μm, and is formed into a U-shaped cross section. .
２は断面Ｔ字形状に成形された突出部であり、
発熱部１と同一組成で、かつMoSi2とSi3N4との
粒径が発熱部１と逆転した関係となつている材料
を焼結したものである。この粒径関係により突出
部２は電気絶縁性を示す。つまり、MoSi2の粒子
どうしの間に細かいSi3N4粒子が存在することに
なり、MoSi2の粒子どうしの接触が断たれるため
導電路が形成されず、電気絶縁体となる。 2 is a protrusion formed into a T-shaped cross section;
It is made by sintering a material that has the same composition as the heat generating part 1 and in which the grain sizes of MoSi 2 and Si 3 N 4 are reversed to that of the heat generating part 1. Due to this particle size relationship, the protrusion 2 exhibits electrical insulation. In other words, fine Si 3 N 4 particles exist between the MoSi 2 particles, and since the contact between the MoSi 2 particles is broken, a conductive path is not formed and they become an electrical insulator.
３はSi3N450モル％とAl2O350モル％とより成
る混合物を焼結して成る電気絶縁性の支持部であ
る。 Reference numeral 3 denotes an electrically insulating support portion formed by sintering a mixture of 50 mol% Si 3 N 4 and 50 mol% Al 2 O 3 .
４は一対の電極で、例えばタングステン線より
成り、支持部３、突出部２、および発熱部２にま
たがつて埋設してある。なお、この電極４はその
先端側を屈曲してあり、その屈曲端４ａは後述す
るように相手側材に接続されるようになつてい
る。 A pair of electrodes 4 are made of, for example, tungsten wire, and are buried astride the support portion 3, the protrusion portion 2, and the heat generating portion 2. Note that this electrode 4 has its tip side bent, and the bent end 4a is connected to a mating member as described later.
なお、突出部２の外表面に発熱部１が接合され
るため、両者の材料を同一にして熱伝導率、熱膨
張係数を一致させ、また両者の接合面角部になだ
らかな曲面を付与し、全体として耐熱衝撃性を向
上させている。 In addition, since the heat generating part 1 is joined to the outer surface of the protruding part 2, both parts are made of the same material so that their thermal conductivity and coefficient of thermal expansion match, and a gently curved surface is provided at the corner of the joint surface of both parts. , improving thermal shock resistance as a whole.
次に第２図に、第１図の発熱体を備えたデイー
ゼルエンジン用セラミツクグロープラグの全体構
成を説明する。 Next, with reference to FIG. 2, the overall structure of a ceramic glow plug for a diesel engine equipped with the heating element shown in FIG. 1 will be explained.
第２図において、５は金属スリーブであつて、
このスリーブ５の内側に前記支持部３がろう付け
してある。即ち、支持部３の一部の外周にはNi
無電解メツキが施してあるり、このNi面にスリ
ーブ５がろう付けされているのである。 In FIG. 2, 5 is a metal sleeve,
The support portion 3 is brazed to the inside of the sleeve 5. That is, the outer periphery of a part of the support part 3 is coated with Ni.
Electroless plating is applied, and the sleeve 5 is brazed to this Ni surface.
６は金属ハウジングであり、外周にねじ部６ａ
を有している。このハウジング６の内側に上記ス
リーブ５がろう付け接合されている。 6 is a metal housing, with a threaded portion 6a on the outer periphery.
have. The sleeve 5 is brazed to the inside of the housing 6.
７は端子軸であり、ハウジング６にマグネシア
等の電気絶縁材８を介して固定されている。 Reference numeral 7 denotes a terminal shaft, which is fixed to the housing 6 via an electrical insulating material 8 such as magnesia.
９は電気絶縁板、１０はナツト、１１は支持部
３の後端に嵌着した金属キヤツプである、発熱部
１に接続された電極４の一方の屈曲端（第１図参
照）の露出部はスリーブ５を介してハウジング６
へボデイアースされ、他方の電極４の屈曲端（第
１図参照）の露出部はプラス側の端子軸１１に接
続されている。従つて、電流は端子軸１１→電極
４→発熱部１→電極４→スリーブ５→ハウジング
６へと流れる。これにより、Ｕ字状の発熱部１が
発熱する。 9 is an electrical insulating plate, 10 is a nut, and 11 is a metal cap fitted to the rear end of the support part 3, which is an exposed part of one bent end (see FIG. 1) of the electrode 4 connected to the heat generating part 1. is connected to the housing 6 through the sleeve 5.
The exposed portion of the bent end (see FIG. 1) of the other electrode 4 is connected to the terminal shaft 11 on the positive side. Therefore, the current flows from the terminal shaft 11 to the electrode 4 to the heating section 1 to the electrode 4 to the sleeve 5 to the housing 6. As a result, the U-shaped heat generating portion 1 generates heat.
次に、前述の第１図の発熱体の製造方法につい
て以下詳述する。 Next, a method for manufacturing the above-mentioned heating element shown in FIG. 1 will be described in detail below.
まず、平均粒径0.9μｍのMoSi230モル％と平均
粒径35μｍのSi3N470モル％とよりなる導電性セ
ラミツク材料50〜65容量％にバインダーを50〜35
容量％加える。 First, a binder is added to 50 to 65% by volume of a conductive ceramic material consisting of 30 mol% of MoSi 2 with an average particle size of 0.9 μm and 70 mol% of Si 3 N 4 with an average particle size of 35 μm.
Add volume%.
バインダーは例えば、パラフイン、アタツクチ
ツクポリプロレン、および高密度ポリエチレンよ
り成り、組成範囲は任意とする。 The binder is composed of, for example, paraffin, attacking polyprolene, and high-density polyethylene, and the composition range is arbitrary.
このバインダーと上記導電性セラミツク材料と
をニーダにて180℃で３時間混練し、粉砕して発
熱部材料とする。 This binder and the above-mentioned conductive ceramic material are kneaded in a kneader at 180°C for 3 hours and pulverized to obtain a heat generating part material.
一方、平均粒径35μｍのMoSi230モル％と平均
粒径0.9μｍのSi3N470モル％とよりなる電気絶縁
性セラミツク材料を前記と同様のバインダーを用
いて同様の方法で突出部材料を調整する。 On the other hand, an electrically insulating ceramic material consisting of 30 mol% of MoSi 2 with an average particle size of 35 μm and 70 mol% of Si 3 N 4 with an average particle size of 0.9 μm was prepared as a protrusion material using the same binder and the same method as above. Adjust.
他方、Si3N450モル％とAl2O350モル％とより
なる電気絶縁性セラミツク材料を前記と同様のバ
インダーを用いて同様の方法で支持部材料を調整
した。 On the other hand, an electrically insulating ceramic material consisting of 50 mol % of Si 3 N 4 and 50 mol % of Al 2 O 3 was prepared as a support material using the same binder and the same method as above.
次に、これらの材料を用いて射出圧力1000Kg／
cm2、成形型温度40℃、上記材料が充填されている
シリンダ温度160〜170℃の成形条件で成形する。 Next, using these materials, the injection pressure was 1000Kg/
cm 2 , the mold temperature is 40°C, and the cylinder temperature filled with the above material is 160 to 170°C.
本成形は前記第１図に示した発熱体を１個づつ
行なうのではなく、通常、多数個同時に行なうも
のである。これは第３図に示すごとく、たとえば
４個同時に成形する。 This molding is not carried out one by one for the heating elements shown in FIG. 1, but is usually carried out for a large number of heating elements at the same time. As shown in FIG. 3, for example, four pieces are molded at the same time.
以下に説明する成形手順は、一個の発熱体の成
形について述べてある。 The molding procedure described below describes the molding of one heating element.
(1) 突出部の成形
第４図ａはさきほど第３図のｘ部分を拡大し
たものであり、第４図ｂのイ−イ矢視図であ
る。また、第４図ｂのＡ−Ａ，Ｂ−Ｂ，Ｃ−Ｃ
の各断面をそれぞれ第４図ｃ，ｄ，ｅに示す。(1) Molding of the protruding portion FIG. 4a is an enlarged view of the x section in FIG. 3, and is a view taken along the arrow A--A in FIG. 4b. Also, A-A, B-B, C-C in Figure 4b
The cross sections of each are shown in FIGS. 4c, d, and e, respectively.
成形型は上型１２と下型１３とに分割された
割型構造としてあり、該上型１２、下型１３の
割型面には電極としてのタングステン線４の直
線部分を保持するための溝１４、およびタング
ステン線４の屈曲４ａを保持するための他の溝
１５をそれぞれ有している。 The mold has a split mold structure divided into an upper mold 12 and a lower mold 13, and the split mold surfaces of the upper mold 12 and the lower mold 13 have grooves for holding the straight portions of the tungsten wires 4 as electrodes. 14, and another groove 15 for holding the bend 4a of the tungsten wire 4.
また、タングステン線４の先端の一部が露出
するよう略Ｔ字形状の絶縁部としての突出部成
形用キヤビテイ１６が設けてあり、かつ該キヤ
ビテイ１６には成形材料の注入が行なわれるゲ
ート１７が開口している。 Further, a substantially T-shaped protrusion molding cavity 16 is provided as an insulating part so that a part of the tip of the tungsten wire 4 is exposed, and a gate 17 through which molding material is injected is provided in the cavity 16. It's open.
かような成形型において、タングステン線４
を上述のごとく上型１２、下型１３の溝１４お
よび１５にセツトして固定するとともに、その
先端の一部をキヤビテイ１６に露出する。 In such a mold, the tungsten wire 4
are set and fixed in the grooves 14 and 15 of the upper mold 12 and lower mold 13 as described above, and a portion of the tip thereof is exposed to the cavity 16.
そして、ゲート１７より前述の突出部材料を
キヤビテイ１６内に射出成形し、第５図のごと
く、タングステン線４と突出部２′との一体結
合成形品を得る。 Then, the above-mentioned protrusion material is injected into the cavity 16 through the gate 17 to obtain a molded product in which the tungsten wire 4 and the protrusion 2' are integrally joined, as shown in FIG.
(2) 支持部の成形
上記の一体結合成形品を別の成形型内にセツ
トする。この成形型は第５図に示す構成を有し
ている。即ち、上型１８と下型１９とに分割さ
れた割型構造としてある。上型１８と下型１９
との間には、前記突出部２′より突出するタン
グステン線４の上半分を露出させる絶縁部とし
ての支持部成形用キヤビテイ２０が設けてあ
り、また下型１９にはタングステン線４の屈曲
端４ａを保持する溝２０ａが設けてある。(2) Molding of the support part The above-mentioned integrally bonded molded product is set in another mold. This mold has the configuration shown in FIG. That is, it has a split mold structure divided into an upper mold 18 and a lower mold 19. Upper mold 18 and lower mold 19
A cavity 20 for molding the support part is provided between the protruding part 2' and the upper half of the tungsten wire 4 as an insulating part. A groove 20a for holding 4a is provided.
なお、上型１８と下型１９との間には、前記
突出部２′を保持する保持溝２１が勿論設けて
ある。 Incidentally, between the upper mold 18 and the lower mold 19, a holding groove 21 for holding the protrusion 2' is of course provided.
上記成形型において、上型１８に設けたゲー
ト２２より前述の支持部材料をキヤビテイ２０
内に射出成形する。これにより、キヤビテイ２
０内のみならず溝２０ａ内にも支持部材料が充
填される。なお、この溝２０ａは、成形圧によ
るタングステン線４の屈曲端４ａの変形を防ぐ
ためのものである。 In the above mold, the above-mentioned support material is poured into the cavity 20 through the gate 22 provided in the upper mold 18.
injection molded inside. As a result, cavity 2
The support material is filled not only in the groove 20a but also in the groove 20a. Note that this groove 20a is provided to prevent the bent end 4a of the tungsten wire 4 from deforming due to molding pressure.
以上によつて、支持部の半分が成形され、同
時に支持部の半分によつてタングステン線４が
固定される。成形後、ゲート部を切削、カツタ
ーナイフ等で除去する。 Through the above steps, half of the support part is formed, and at the same time, the tungsten wire 4 is fixed by the half of the support part. After molding, the gate portion is removed by cutting or using a cutter knife.
次に、これを別の成形型内に保持し、残つた
半分の支持部を成形する。 This is then held in another mold and the remaining support half is molded.
これは第６図ａ，ｂ，ｃに示すごとく、割型
構造となつていると上型２３と下型２４との間
には溝２５，２６が設けてあり、ここに第５図
の成形部品をセツトし、固定する。上型２３に
は支持部の半分を成形するための支持部成形用
キヤビテイ２７が設けてあり、ここに上型２３
のゲート２８より前述の支持部材料を射出成形
する。これにより、支持部の残り半分が成形さ
れ、突出部２′、支持部３′、およびタングステ
ン線４の一体結合成形品を得る。 As shown in Fig. 6 a, b, and c, if the mold has a split mold structure, grooves 25 and 26 are provided between the upper mold 23 and the lower mold 24, and the grooves 25 and 26 are formed in the molding shown in Fig. 5. Set and secure the parts. The upper mold 23 is provided with a supporting part molding cavity 27 for molding half of the supporting part.
The above-mentioned support material is injection molded through the gate 28. As a result, the remaining half of the support part is molded, and a molded product of the protrusion 2', the support part 3', and the tungsten wire 4 is obtained.
(3) 発熱部の成形
上記の一体結合成形品を別の成形型にセツト
し、固定する。この成形型も第７図ａ，ｂのご
とく割型構造としてあり、一体結合成形品を上
型２９と下型３０とに設けた溝４９，５０にセ
ツトし、固定する。また、上型２９と下型３０
との間に設けた、突出部２′周りのキヤビテイ
３１内にゲート３２より前述の発熱部材料を射
出成形する。その後、ゲート部を切削、カツタ
ーナイフ等で除去する。(3) Molding of heat generating part Set the above integrally bonded molded product in another mold and fix it. This mold also has a split mold structure as shown in FIGS. 7a and 7b, and the integrally bonded molded product is set and fixed in grooves 49 and 50 provided in the upper mold 29 and the lower mold 30. In addition, the upper mold 29 and the lower mold 30
The above-mentioned heat generating part material is injection molded through the gate 32 into the cavity 31 around the protrusion 2' provided between the two. Thereafter, the gate portion is removed by cutting or using a cutter knife or the like.
得られた発熱体成形品を成形型より取出し、
温度1600〜1700℃、圧力500〜700Kg／cm2の条件
でホツトプレスで焼成し、セラミツクヒータの
発熱体を得る。 The obtained heating element molded product is taken out from the mold,
It is fired in a hot press at a temperature of 1600 to 1700°C and a pressure of 500 to 700 kg/cm 2 to obtain a heating element for a ceramic heater.
なお、本実施例において、上記成形順序(1)〜
(3)を任意に変更しても勿論よい。 In addition, in this example, the above molding order (1) to
Of course, (3) may be changed arbitrarily.
また、突出部２と支持部３とを同一材料で構
成した場合には上記成形順序の(1)、および(2)の
支持部半分成形（第５図）は同時に行なうこと
ができる。 Furthermore, when the protrusion 2 and the support part 3 are made of the same material, the molding steps (1) and (2) of the support part halves (FIG. 5) in the above molding order can be performed at the same time.
次に、本発明の他の実施例について説明する。 Next, other embodiments of the present invention will be described.
第８図は例えば自動車暖房装置における燃焼器
の着火源として使用されるセラミツクヒータの発
熱体の構成を示している。発熱部１の全外周囲は
支持部３と同一材料により密封されている。これ
は燃料の燃焼時に発生するカーボンが発熱部１に
付着してシヨートサーキツトを形成するのを防止
するためである。突出部２は支持部３と同一材料
より成る。タングステン線４は前記第１図の実施
例と同じく屈曲端４ａを有し、その側面は同じく
支持部４の外面に露出している。なお、発熱部１
および支持部３は前記第１図の実施例と同一の材
料で構成されている。 FIG. 8 shows the configuration of a heating element of a ceramic heater used, for example, as an ignition source for a combustor in an automobile heating system. The entire outer periphery of the heat generating part 1 is sealed with the same material as the support part 3. This is to prevent carbon generated during fuel combustion from adhering to the heat generating portion 1 and forming a short circuit. The protrusion 2 is made of the same material as the support 3. The tungsten wire 4 has a bent end 4a as in the embodiment shown in FIG. In addition, the heat generating part 1
The support portion 3 is made of the same material as in the embodiment shown in FIG.
次に、この発熱体の成形方法について説明す
る。尚、材料組成、混練条件、成形条件は前記実
施例と同一である。 Next, a method for molding this heating element will be explained. The material composition, kneading conditions, and molding conditions were the same as in the previous example.
(1) 発熱部の成形
第９図ａ〜ｃにおいて、割型構造となつてい
る上型３３、下型３４の分割面の溝３５にタン
グステン線４を固定し、かつ下型３４の溝３６
にタングステン線４の屈曲端４ａを保持する。
上型３３、下型３４によつて形成したキヤビテ
イ３７内にゲート３８を経て前記発熱部材料を
射出成形する。(1) Molding of the heat generating part In FIGS. 9a to 9c, the tungsten wire 4 is fixed in the groove 35 of the split surface of the upper mold 33 and the lower mold 34, which have a split mold structure, and the groove 36 of the lower mold 34 is fixed.
The bent end 4a of the tungsten wire 4 is held in place.
The heat generating part material is injection molded into a cavity 37 formed by an upper mold 33 and a lower mold 34 through a gate 38.
これにより、発熱部２′とタングステン線４
との一体結合成形品を得る。 As a result, the heat generating part 2' and the tungsten wire 4
Obtain an integrally bonded molded product.
(2) 支持部の成形
上記一体結合成形品において、発熱部２′の
ゲート部を除去し、第１０図ａ〜ｄの別の成形
型にセツトする。この成形型は割型構造であ
り、上型３９には発熱部２′より突出するタン
グステン線４の直線部の半分が露出するととも
に、発熱部２′の半分が露出するキヤビテイ４
１が設けてある。下型４０にはタングステン線
４の屈曲端４ａを保持するととにキヤビテイ４
１に開口する溝４２が設けてある。(2) Molding of the support part The gate part of the heat generating part 2' of the above-mentioned integral molded product is removed and set in another mold as shown in FIGS. 10a to 10d. This mold has a split mold structure, and the upper mold 39 has half of the straight part of the tungsten wire 4 protruding from the heat generating part 2' exposed, and a cavity 4 in which half of the heat generating part 2' is exposed.
1 is provided. The lower die 40 holds the bent end 4a of the tungsten wire 4, and the cavity 4
1 is provided with a groove 42 opening therein.
上型３９に設けたゲート４３より前記支持部
材料を射出成形し、支持部の半分を成形する。 The supporting part material is injection molded through a gate 43 provided in the upper die 39 to form half of the supporting part.
次に、第１１図ａ，ｂ，ｃのごとく、別の割
型構造の成形型を用いて支持部の残り半分を成
形する。上型４４には支持部の残り半分を成形
するキヤビテイ４６が設けてあり、下型４５に
は予め成形した半分の支持部を受ける溝４７が
設けてある。上型４４に設けたゲート４８より
支持部材料を射出成形する。ゲート部を除去し
たち、成形型より取出し、前記実施例と同一条
件でホツトプレスし焼成して発熱体を得る。 Next, as shown in FIGS. 11a, b, and c, the remaining half of the support part is molded using another mold having a split mold structure. The upper mold 44 is provided with a cavity 46 for molding the remaining half of the support part, and the lower mold 45 is provided with a groove 47 for receiving the preformed half of the support part. The support material is injection molded through a gate 48 provided in the upper mold 44. After removing the gate portion, it is taken out from the mold, hot pressed and fired under the same conditions as in the previous example to obtain a heating element.
なお、本発明は各実施例の材料、成形条件に限
定されるものでないことは明らかである。 Note that it is clear that the present invention is not limited to the materials and molding conditions of each example.
第１図ａ〜ｃは本発明の一実施例である発熱体
を示すもので、第１図ａは平面図、第１図ｂは右
側面図、第１図ｃは正面図、第２図は第１図の発
熱体を用いたグロープラグを示す断面図、第３図
は本発明の成形型の一実施例を示す平面図、第４
図ａ〜ｅは突出部の成形方法の説明に供する成形
型を示すもので、第４図ａは下型を第４図ｂのイ
−イ方向からみた平面図、第４図ｂは断面側面
図、第４図ｃは第４図ｂのＡ−Ａ断面図、第４図
ｄは第４図ｂのＢ−Ｂ断面図、第４図ｅは第４図
ｂのＣ−Ｃ断面図、第５図ａ〜ｃは支持部の半分
を成形する方法の説明に供する成形型を示すもの
で、第５図ａは下型を第５図ｂのロ−ロ方向から
みた平面図、第５図ｂは断面側面図、第５図ｃは
第５図ｂのＤ−Ｄ断面図、第６図ａ〜ｃは支持部
の残りの半分を成形する方法の説明に供する成形
型を示すもので、第６図ａは下型を第６図ｂのハ
−ハ方向からみた平面図、第６図ｂは断面側面
図、第６図ｃは第６図ｂのＥ−Ｅ断面図、第７図
ａ，ｂは発熱部の成形方法の説明に供する成形型
を示すもので、第７図ａは下型を第７図ｂのニ−
ニ方向からみた平面図、第７図ｂは断面側面図、
第８図ａ〜ｃは本発明の他の実施例である発熱体
を示すもので、第８図ａは平面図、第８図ｂは右
側側面図、第８図ｃは正面図、第９図〜第１１図
は第８図の発熱体の成形方法を示すもので、第９
図ａ〜ｃは発熱部の成形方法の説明に供する成形
型を示すものであつて、第９図ａは下型を第９図
ｂのホ−ホ方向からみた平面図、第９図ｂは断面
側面図、第９図ｃは第９図ｂのＦ−Ｆ断面図、第
１０図ａ〜ｄは支持部の半分の成形方法の説明に
供する成形型を示すもので、第１０図ａは下型を
第１０図ｂのヘ−ヘ方向からみた平面図、第１０
図ｂは断面側面図、第１０図ｃは第１０図ｂのＧ
−Ｇ断面図、第１０図ｄは第１０図ｂのＨ−Ｈ断
面図、第１１図ａ〜ｄは支持部の残り半分の成形
方法の説明に供する成形型を示すもので、第１１
図ａは下型を第１１図ｂのト−ト方向からみた平
面図、第１１図ｂは断面側面図、第１１図ｃは第
１１図ｂの−断面図、第１１図ｄは第１１図
ｂのＪ−Ｊ断面図である。
１……発熱部、２……突出部、３……支持部、
４……電極、１２……上型、１３……下型、１６
……キヤビテイ。
Figures 1 a to c show a heating element that is an embodiment of the present invention, where Figure 1 a is a plan view, Figure 1 b is a right side view, Figure 1 c is a front view, and Figure 2 3 is a sectional view showing a glow plug using the heating element of FIG. 1, FIG. 3 is a plan view showing an embodiment of the mold of the present invention, and FIG.
Figures a to e show molds used to explain the method for molding the protrusion, and Figure 4a is a plan view of the lower mold seen from direction A-A in Figure 4b, and Figure 4b is a cross-sectional side view. Figure 4c is a sectional view taken along line AA in Figure 4b, Figure 4d is a sectional view taken along line B-B in Figure 4b, and Figure 4e is a sectional view taken along line C-C in Figure 4b. Figures 5 a to 5 c show molds used to explain the method of molding half of the support part, and Figure 5 a is a plan view of the lower mold seen from the roller direction of Figure 5 b; Figure b is a sectional side view, Figure 5c is a sectional view taken along line DD in Figure 5b, and Figures 6a to 6c show a mold for explaining the method for molding the remaining half of the support part. , Fig. 6a is a plan view of the lower die seen from the direction of Fig. 6b, Fig. 6b is a sectional side view, Fig. 6c is a sectional view taken along line E-E in Fig. 6b, and Fig. Figures a and b show molds used to explain the method of molding the heat generating part, and Figure 7 a shows the lower mold as shown in Figure 7 b.
A plan view seen from two directions, FIG. 7b is a cross-sectional side view,
Figures 8a to 8c show a heating element according to another embodiment of the present invention, in which Figure 8a is a plan view, Figure 8b is a right side view, Figure 8c is a front view, and Figure 8c is a front view. Figures 11 to 11 show the method of forming the heating element shown in Figure 8.
Figures a to c show molds used to explain the method of molding the heat generating part. Figure 9a is a plan view of the lower mold viewed from the hoe direction in Figure 9b, and Figure 9b is a The sectional side view, FIG. 9c is a sectional view taken along the line FF in FIG. 9b, and FIGS. 10a to 10d show a mold for explaining the method of forming half of the support part. FIG. 10a is a cross-sectional side view. A plan view of the lower mold viewed from the direction of Fig. 10b, No. 10
Figure b is a cross-sectional side view, Figure 10c is the G of Figure 10b.
-G sectional view, FIG. 10 d is a HH sectional view of FIG. 10 b, and FIGS.
Figure a is a plan view of the lower mold seen from the tote direction in Figure 11b, Figure 11b is a cross-sectional side view, Figure 11c is a cross-sectional view of Figure 11b, and Figure 11d is a It is a JJ sectional view of figure b. 1...Heating part, 2...Protruding part, 3...Supporting part,
4... Electrode, 12... Upper mold, 13... Lower mold, 16
... Cavity.
Claims (1)
し、一対の電極の一端側が露出する、成形型内の
発熱部成形用キヤビテイー内、ならびに該電極の
一端側を除く他の領域が露出する、成形型内の絶
縁部成形用キヤビテイー内に、各々導電性を有す
るセラミツク材料を包含した発熱部材料、電気絶
縁性を有するセラミツク材料を包含した絶縁部材
料を射出成形し、発熱部ならびに絶縁部を前記電
極に一体的に結合することを特徴とするセラミツ
クヒータの製造方法。1. A pair of electrodes are arranged side by side and spaced apart from each other in a mold, and one end side of the pair of electrodes is exposed. The inside of the cavity for molding the heat generating part in the mold and other areas other than the one end side of the electrodes are exposed. A heat generating part material containing a ceramic material having electrical conductivity and an insulating part material containing a ceramic material having electrical insulation properties are respectively injection molded into a cavity for molding an insulating part in a mold, and the heat generating part and the insulating part are formed. A method for manufacturing a ceramic heater, characterized in that the electrode is integrally bonded to the electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18915085A JPS6251183A (en) | 1985-08-28 | 1985-08-28 | Manufacture of ceramic heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18915085A JPS6251183A (en) | 1985-08-28 | 1985-08-28 | Manufacture of ceramic heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6251183A JPS6251183A (en) | 1987-03-05 |
| JPH0261793B2 true JPH0261793B2 (en) | 1990-12-21 |
Family
ID=16236263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18915085A Granted JPS6251183A (en) | 1985-08-28 | 1985-08-28 | Manufacture of ceramic heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6251183A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62249712A (en) * | 1986-04-24 | 1987-10-30 | 株式会社日本製鋼所 | Manufacture of sintered product through injection molding |
| JP3947661B2 (en) * | 2001-10-01 | 2007-07-25 | 日鉱金属株式会社 | MoSi2 plate heater |
| WO2010071049A1 (en) * | 2008-12-15 | 2010-06-24 | 京セラ株式会社 | Ceramic heater |
-
1985
- 1985-08-28 JP JP18915085A patent/JPS6251183A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6251183A (en) | 1987-03-05 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |