JPS6117346B2 - - Google Patents
Info
- Publication number
- JPS6117346B2 JPS6117346B2 JP16384580A JP16384580A JPS6117346B2 JP S6117346 B2 JPS6117346 B2 JP S6117346B2 JP 16384580 A JP16384580 A JP 16384580A JP 16384580 A JP16384580 A JP 16384580A JP S6117346 B2 JPS6117346 B2 JP S6117346B2
- Authority
- JP
- Japan
- Prior art keywords
- electric brush
- kneading
- binder
- brush material
- present
- 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
- 239000000463 material Substances 0.000 claims description 40
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 239000011230 binding agent Substances 0.000 claims description 10
- 238000004898 kneading Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000010304 firing Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000009740 moulding (composite fabrication) Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 9
- 239000000843 powder Substances 0.000 description 6
- 238000010298 pulverizing process Methods 0.000 description 6
- 239000000779 smoke Substances 0.000 description 6
- 239000011280 coal tar Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 229910021383 artificial graphite Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005087 graphitization Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011163 secondary particle Substances 0.000 description 1
- 239000011271 tar pitch Substances 0.000 description 1
Landscapes
- Manufacturing Of Electrical Connectors (AREA)
- Conductive Materials (AREA)
- Motor Or Generator Current Collectors (AREA)
Description
本発明は電刷子材の製造方法に関する。
通常の電気黒鉛質電刷子材の製造方法は、コー
クス粉、黒鉛粉、油煙等を骨材とし、これにター
ルピツチ、コールタール、樹脂等の結合材を加え
加熱混練したのち、粉砕、篩別、混合、成形、焼
成及び黒鉛化の工程を経て煉瓦状のブロツクを得
る方法であり、単に一次粒子のみの集合体である
ため固有抵抗が小さく弾性率の大きいものになり
易い。従つてこのブロツクから得られた電刷子を
高速の回転機に用いると摺動相手材を摩耗させ易
く、電気機械の整流性能が低下し、火花を発生し
かつ整流子銅の表面を研削するため条痕を発生
し、これが整流子面ののめり（ドラツキング）、
さらには整流子片間短絡からフラツシユオーバー
事故に発展する等の問題があつた。
これらの問題点を解決するために粒子を弾性の
あるポーラスな集団とするか、または超微細粉と
したのち成形工程における圧力を小さくしてブロ
ツクの空〓を大にする方法が考えられるが、従来
は前者の方法は不可能であり、後者の方法では粒
子間結合が弱く摺動材として実用性に乏しい欠点
があつた。
本発明は、このような問題を解消し、固有抵抗
大でしかも弾性率小さく、粘性の大きい電刷子材
の製造方法を提供することを目的とする。
本発明は骨材炭素粉と結合材を混練したのち、
非酸化性雰囲気中で揮発性物質発生温度域あるい
は、より以上の温度域で急速加熱を行なつて多孔
質混練物とし、この粉砕物を前記結合材で再混練
したのち、粉砕、篩別、混合、成形、焼成及び黒
鉛化することを特徴とする電刷子材の製造方法に
関する。
第１図は、従来製法（点線）と本発明になる製
法（実線）を比較したフロー図である。黒鉛粉ま
たは油煙を主体とする骨材と結合材を混練（一次
混練と呼ぶ）するまでは従来製法と同じである。
本発明では一次混練材を加熱容器にとり放冷後、
窒素またはアルゴンガス等の非酸化性雰囲気炉中
に挿入し、300〜650℃まで短時間に昇温加熱す
る。昇温する時間は長くても５時間を限定とす
る。他の加熱法として、あらかじめ該加熱炉中に
不活性ガスを充填しておき、加熱と同時に減圧し
混練材中の主として低分子量の揮発物質を迅速に
除去する方法がある。加熱温度は混練材の該揮発
分が発生する温度（300℃）でよいが、混練物に
よつては、更に高い温度（500〜600℃）まで短時
間に昇温させる必要がある。このようにして多孔
質な混練物が得られる。これを80メツシユ以下に
粉砕（一次粉砕と呼ぶ）したのち、前記結合剤に
より再度加熱混練（二次混練と呼ぶ）し冷却した
のち、約20メツシユ以下の二次粒子に再粉砕（二
次粉砕と呼ぶ）し、適切な粒子構成の粉砕に篩別
混合する。このあとは従来の製法により、成形、
焼成および黒鉛化工程を経て電刷子材を得る。
以下実施例に従つて説明する。
実施例 １
骨材としての油煙100重量部に結合材のコール
タール35重量部を加え、最高温度210℃で一次混
練し冷却したのち、窒素気流中で600℃まで５時
間を要して昇温加熱後放冷して一次粉砕する。こ
の粉砕物にコールタール30重量部を加え、加熱し
乍ら二次混練後、二次粉砕、篩別してから23〜32
メツシユの粉末60％と32メツシユ以下の粉末40％
を混合し、圧縮成形して厚さ55mm、幅120mm、長
さ220mmのブロツクを作り、これを焼成し黒鉛化
して電刷子材を得た。この電刷子材と従来製法に
よる油煙骨材の電刷子材の物理特性比較を第１表
に示した。
The present invention relates to a method of manufacturing an electronic brush material. The usual manufacturing method for electric graphite brush materials is to use coke powder, graphite powder, oil smoke, etc. as aggregate, add binders such as tar pitch, coal tar, resin, etc., heat and knead, then crush, sieve, etc. This is a method of obtaining a brick-like block through the steps of mixing, molding, firing, and graphitization, and since it is simply an aggregate of primary particles, it tends to have a low specific resistance and a high elastic modulus. Therefore, if an electric brush obtained from this block is used in a high-speed rotating machine, it will easily wear out the sliding mating material, reduce the rectifying performance of the electric machine, generate sparks, and grind the surface of the commutator copper. This causes striations on the commutator surface (dragging),
Furthermore, there were problems such as short circuits between commutator pieces, which could lead to flashover accidents. In order to solve these problems, it is possible to make the particles into an elastic porous mass, or to make them into ultra-fine powder and then reduce the pressure in the molding process to increase the voids in the block. Conventionally, the former method was impossible, and the latter method had the disadvantage of weak interparticle bonding, making it impractical as a sliding material. SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a method for manufacturing an electric brush material that has a high specific resistance, a low elastic modulus, and a high viscosity. In the present invention, after kneading aggregate carbon powder and binder,
Rapid heating is performed in a non-oxidizing atmosphere at a volatile substance generation temperature range or a higher temperature range to form a porous kneaded product, and this pulverized product is re-kneaded with the binder, followed by pulverization, sieving, The present invention relates to a method of manufacturing an electric brush material, which includes mixing, molding, firing, and graphitizing. FIG. 1 is a flow diagram comparing the conventional manufacturing method (dotted line) and the manufacturing method of the present invention (solid line). The process is the same as the conventional manufacturing method until the aggregate, which is mainly composed of graphite powder or oil smoke, and the binder are kneaded (referred to as primary kneading).
In the present invention, the primary kneading material is placed in a heating container, left to cool, and then
It is placed in a furnace with a non-oxidizing atmosphere such as nitrogen or argon gas, and heated to 300-650°C in a short period of time. The time for heating is limited to 5 hours at most. As another heating method, there is a method in which the heating furnace is filled with an inert gas in advance, and the pressure is reduced at the same time as heating to quickly remove mainly low molecular weight volatile substances in the kneaded material. The heating temperature may be the temperature at which the volatile matter of the kneaded material is generated (300°C), but depending on the kneaded material, it may be necessary to raise the temperature to an even higher temperature (500 to 600°C) in a short time. In this way, a porous kneaded material is obtained. After pulverizing this into 80 meshes or less (referred to as primary pulverization), it is heated and kneaded again with the binder (referred to as secondary kneading), cooled, and then re-pulverized into secondary particles of approximately 20 meshes or less (secondary pulverization). ) and then sieved and mixed to grind the appropriate particle composition. After this, molding is done using conventional manufacturing methods.
An electric brush material is obtained through a firing and graphitization process. Examples will be explained below. Example 1 35 parts by weight of coal tar as a binder was added to 100 parts by weight of oil smoke as an aggregate, and after first kneading and cooling at a maximum temperature of 210°C, the temperature was raised to 600°C in a nitrogen stream over a period of 5 hours. After heating, the mixture is allowed to cool and is first crushed. Add 30 parts by weight of coal tar to this pulverized material, heat it and then knead it for a second time.
60% powder of mesh and 40% powder of less than 32 mesh
were mixed and compression molded to make a block with a thickness of 55 mm, width of 120 mm, and length of 220 mm, which was fired and graphitized to obtain an electric brush material. Table 1 shows a comparison of the physical properties of this electric brush material and the electric brush material made of oil smoke aggregate produced by the conventional method.
【表】
この素材より電刷子を製作し、100KW直流発
電機にて周速毎秒42mで整流試験を行ない無火花
帯を求めた結果を従来材と比較して第２図に示し
た。また同試験機によりブラシ負荷電流15A／cm2
で500時間運転を行ない、1000時間換算摩耗量を
求めた結果を従来材と比較して第３図に示した。
本発明材は従来製法材に比較して無火花帯、摩
耗量ともに大幅に改善されている。
実施例 ２
骨材としての人造黒鉛粉末100重量部に対し結
合材のコールタール30重量部を加え、最高温度
230℃で一次混練し冷却したのち、アルゴンガス
気流中で400℃まで３時間を要して昇温加熱後、
放冷して多孔質の混練物を得た。これを一次粉砕
したものにコールタール15重量部を加え、二次混
練後、二次粉砕、篩別してから20〜32メツシユの
粉末60％と32メツシユ以下の粉末40％とを混合
し、圧縮成形し、実施例１と同じ寸法のブロツク
を作り、次に焼成し黒鉛化して電刷子材を得た。
この電刷子材と従来製法による人造黒鉛を骨材と
した電刷子材の物理特性の比較を第２表に示し
た。[Table] An electric brush was made from this material, and a rectification test was conducted using a 100KW DC generator at a circumferential speed of 42 m/s. The results of the non-sparking zone were compared with conventional materials and are shown in Figure 2. The same testing machine also showed a brush load current of 15A/ cm2.
Figure 3 shows the results of 500 hours of operation and the calculated wear amount equivalent to 1000 hours compared to conventional materials. The material of the present invention has significantly improved non-sparking zone and wear amount compared to conventionally produced materials. Example 2 30 parts by weight of coal tar as a binder was added to 100 parts by weight of artificial graphite powder as an aggregate, and the maximum temperature
After primary kneading and cooling at 230°C, the mixture was heated to 400°C in an argon gas stream for 3 hours.
The mixture was left to cool to obtain a porous kneaded product. 15 parts by weight of coal tar is added to the primary pulverization of this, and after secondary kneading, secondary pulverization and sieving, 60% powder of 20 to 32 mesh and 40% powder of 32 mesh or less are mixed and compression molded. A block having the same dimensions as in Example 1 was made, and then fired and graphitized to obtain an electric brush material.
Table 2 shows a comparison of the physical properties of this electric brush material and electric brush materials manufactured using conventional methods using artificial graphite as an aggregate.
【表】
この素材より電刷子を製作し23KW直流発電機
にて周速毎秒18mで整流試験を行ない無火花帯を
求めた結果を従来材と比較して第４図に示した。
また800W整流子電動機を用い18000r.p.m.負荷電
流8A／cm2で100時間運転したときの摩耗量を第５
図に示した。本発明材は実施例１と同様、従来製
法品に比較して無火花帯、摩耗量ともに大幅に改
善されている。
本発明になる電刷子材は上記したように、電刷
子材を構成する粉体粒子を製造過程において多孔
性とし、これを再度結合材で混練して粒間結合を
緊密にしたもので、第１表及び第２表に見るよう
に従来製法材に比較して固有抵抗大、曲げ強さ
大、弾性率小となり、第２図及び第４図の整流試
験においても、従来製法材に比較して無火花帯が
広くなり整流性能が改善されている。これは本発
明の電刷子が回転機との摺動において、座乗性、
追従性が大幅に改善された証拠である。また、第
３図及び第５図から明らかなように電刷子摩耗が
著しく改善されている。従つて該電刷子を用いた
回転電機の寿命を長くする効果が大きい。[Table] An electric brush was made from this material, and a rectification test was conducted using a 23KW DC generator at a circumferential speed of 18 m/s to find the spark-free zone. The results are shown in Figure 4 in comparison with conventional materials.
In addition, the amount of wear when operating an 800W commutator motor for 100 hours at a load current of 8A/ cm2 at 18000r.pm was measured as the fifth
Shown in the figure. Similar to Example 1, the material of the present invention has significantly improved non-sparking zone and wear amount compared to the conventionally manufactured product. As described above, the electric brush material of the present invention is made by making the powder particles constituting the electric brush material porous during the manufacturing process, and kneading them again with a binder to make the intergranular bonds tighter. As shown in Tables 1 and 2, compared to conventionally manufactured materials, it has higher specific resistance, higher bending strength, and lower elastic modulus, and in the rectification tests shown in Figures 2 and 4, compared to conventionally manufactured materials. The non-sparking zone is widened and rectification performance is improved. This is due to the fact that the electric brush of the present invention has poor sitting comfort when sliding on a rotating machine.
This is evidence that followability has been greatly improved. Furthermore, as is clear from FIGS. 3 and 5, the wear of the electric brush has been significantly improved. Therefore, the effect of lengthening the life of a rotating electrical machine using the electric brush is significant.
第１図は、従来製法と比較した本発明電刷子材
の製法のフロー図、第２図及び第４図は、従来製
法電刷子材と本発明電刷子材の整流試験結果を示
す図、第３図及び第５図は、従来製法電刷子材と
本発明電刷子材との電刷子摩耗を比較した図であ
る。
符号の説明、１……従来製法による油煙系の電
刷子材、２……本発明になる油煙系の電刷子材、
３……従来製法による黒鉛系の電刷子材、４……
本発明になる黒鉛系の電刷子材。
FIG. 1 is a flowchart of the manufacturing method of the electric brush material of the present invention in comparison with the conventional manufacturing method. FIGS. 3 and 5 are diagrams comparing electric brush wear between the conventionally produced electric brush material and the electric brush material of the present invention. Explanation of the symbols: 1... Oil-smoke-based electric brush material produced by a conventional method; 2... Oil-smoke-based electric brush material according to the present invention;
3... Graphite-based electric brush material manufactured by conventional method, 4...
Graphite-based electric brush material according to the present invention.
Claims (1)
性雰囲気中で揮発物質発生温度域あるいはより以
上の温度域で、急速加熱を行なつて多孔質混練物
とし、この粉砕物を前記結合材で再混練したの
ち、粉砕、篩別、混合、成形、焼成及び黒鉛化す
ることを特徴とする電刷子材の製造方法。1 After kneading the aggregate carbon powder and the binder, rapid heating is performed in a non-oxidizing atmosphere at a volatile substance generation temperature range or higher temperature range to form a porous kneaded product, and this pulverized product is mixed with the above-mentioned binder. A method for producing an electric brush material, which comprises re-kneading the material, followed by crushing, sieving, mixing, forming, firing and graphitizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16384580A JPS5787006A (en) | 1980-11-19 | 1980-11-19 | Method of producing electric brush material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16384580A JPS5787006A (en) | 1980-11-19 | 1980-11-19 | Method of producing electric brush material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5787006A JPS5787006A (en) | 1982-05-31 |
| JPS6117346B2 true JPS6117346B2 (en) | 1986-05-07 |
Family
ID=15781840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16384580A Granted JPS5787006A (en) | 1980-11-19 | 1980-11-19 | Method of producing electric brush material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5787006A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6073648B2 (en) * | 2012-11-07 | 2017-02-01 | イビデン株式会社 | Graphite material manufacturing method and carbon-based raw material crusher |
-
1980
- 1980-11-19 JP JP16384580A patent/JPS5787006A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5787006A (en) | 1982-05-31 |
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