JPH03251417A - Formation of cylindrical resin molding - Google Patents
Formation of cylindrical resin moldingInfo
- Publication number
- JPH03251417A JPH03251417A JP5024290A JP5024290A JPH03251417A JP H03251417 A JPH03251417 A JP H03251417A JP 5024290 A JP5024290 A JP 5024290A JP 5024290 A JP5024290 A JP 5024290A JP H03251417 A JPH03251417 A JP H03251417A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- resin material
- glass fiber
- mixed
- commutator
- 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
- 229920005989 resin Polymers 0.000 title claims abstract description 67
- 239000011347 resin Substances 0.000 title claims abstract description 67
- 238000000465 moulding Methods 0.000 title claims description 12
- 230000015572 biosynthetic process Effects 0.000 title 1
- 239000000463 material Substances 0.000 claims abstract description 34
- 239000003365 glass fiber Substances 0.000 claims abstract description 29
- 238000000748 compression moulding Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 8
- 239000007924 injection Substances 0.000 abstract description 8
- 239000003471 mutagenic agent Substances 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 238000001721 transfer moulding Methods 0.000 description 4
- 239000012778 molding material Substances 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000009474 immediate action Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、圧縮成形される円筒状樹脂成形体の成形方法
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for molding a cylindrical resin molded body by compression molding.
［従来技術及び発明が解決しようとする課題］一般に、
円筒状樹脂成形体を熱硬化性樹脂成形材料を用いて圧縮
成形する場合、加熱さｉｃている上型および下型間のキ
ャビティに樹脂成形材料を入れて加熱、加圧することで
可塑化し、固化後成形体を取り出すことで製造されてい
る。また、成形材料には、フェノール樹脂に強度アップ
を計るためのガラス繊維を混合するものがある。[Prior art and problems to be solved by the invention] Generally,
When compression molding a cylindrical resin molded body using a thermosetting resin molding material, the resin molding material is placed in the cavity between the heated upper and lower molds, and is heated and pressurized to plasticize and solidify. It is manufactured by taking out the post-formed product. Furthermore, some molding materials are made by mixing phenolic resin with glass fiber to increase strength.
ところで円筒状樹脂成形体の一例として各種モータに使
用されるコンミテータがあるが、これは圧縮成形、移送
成形、射出成形等の樹脂成形方法によって成形を行って
いた。しかし、圧縮成形では、樹脂材に混合したガラス
繊維が無秩序に配向されるため、充分な回転強度を得る
ことができず真円度や耐久性に劣る欠点があった。一方
、移送成形や射出成形では、樹脂材が小径なスプルーを
経てキャビティ内に流入せしめられるため、ゲート形状
によって樹脂材内のガラス繊維がコンミテータの円周方
向に沿うべく配向されて必要な回転強度が得られること
になるが、移送成形および射出成形においては、スプル
ー等に残留する樹脂材料が多いため、材料歩留まりが悪
く製造コス１へが高くなる欠点があった。By the way, as an example of a cylindrical resin molded body, there is a commutator used in various motors, but this has been molded by resin molding methods such as compression molding, transfer molding, and injection molding. However, in compression molding, the glass fibers mixed with the resin material are oriented randomly, so that sufficient rotational strength cannot be obtained, resulting in poor roundness and durability. On the other hand, in transfer molding and injection molding, the resin material is forced to flow into the cavity through a small diameter sprue, so the gate shape orients the glass fibers in the resin material along the circumferential direction of the commutator, thereby achieving the required rotational strength. However, in transfer molding and injection molding, there is a large amount of resin material remaining on the sprue, etc., which has the drawback of poor material yield and high manufacturing cost.
［課題を解決するための手段］
本発明は、上記の如き実情に鑑みこれらの欠点＝１
一
を−掃することができる円筒状樹脂成形体の成形方法を
提供することを目的として創案されたものであって、予
備室に充填されたガラス繊維混合樹脂材を、プランジャ
作動によりキャビティ内に押し込んで円筒状樹脂成形体
を圧縮成形するに、上記樹脂１祭、予備室に渦巻状に射
出充填して混合ガラス繊維の予備配向を行った後、キャ
ビティ内に押し込んで圧縮成形することを特徴とするも
のである。[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was created with the aim of providing a method for molding a cylindrical resin molded body that can eliminate these drawbacks. In order to compression mold a cylindrical resin molded body by pushing the glass fiber mixed resin material filled in the preliminary chamber into the cavity by plunger operation, the resin is injected into the preliminary chamber in a spiral shape. After pre-orienting the mixed glass fibers, the mixed glass fibers are pressed into a cavity and compression molded.
そして本発明は、この構成によって、真円度および耐久
性に優れる円筒状樹脂成形体を安価に製造することがで
きるようにしたものである。According to the present invention, with this configuration, a cylindrical resin molded body having excellent roundness and durability can be manufactured at a low cost.
［実施例コ
次に、本発明の実施例を図面に基づいて説明する。図面
において、１は円筒状樹脂成形体を構成するコンミテー
タであって、該コンミテータ１は、周面部にセグメント
］ａが周方向に所定間隔を存して一体的に埋設されるよ
う、絶縁性のフェノール樹脂により円筒形状に形成され
ている。[Embodiment] Next, an embodiment of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a commutator constituting a cylindrical resin molded body, and the commutator 1 has an insulating material so that segments [a] are integrally embedded in the circumferential surface at predetermined intervals in the circumferential direction. It is made of phenol resin and has a cylindrical shape.
上記コンミテータ１の成形装置（図示ぜず））は、後述
する樹脂材が充填される樹脂ボッ１−、コンミテータ１
を縦姿勢に成形するへくキャビティ（成形室）が形成さ
れた金型、−１−記キャヒテイ内に樹脂材を押し込むべ
く一１―下作動するプランジャ等により所謂圧縮成形装
置に構成されている。そして成形装置では、樹脂ポット
に充填された樹脂材を、セグメン１〜］−ａが予めセッ
トされたキャビティにプランジャの作動により押し込ん
で加圧加熱した後、硬化してコンミテータ１を成形する
ようになっている。The molding device (not shown) for the commutator 1 includes a resin bottle 1-, which is filled with a resin material to be described later, and a commutator 1.
A so-called compression molding device includes a mold in which a hollow cavity (molding chamber) is formed to mold the resin material in a vertical position, a plunger that operates downward to push the resin material into the cavity, etc. . Then, in the molding device, the resin material filled in the resin pot is pushed into a cavity in which segments 1 to ]-a are set in advance by the operation of a plunger, heated under pressure, and then hardened to mold the commutator 1. It has become.
さらに、成形装置には、加熱手段を備える加熱筒、該加
熱筒に内装されるスクリュー、該スクリューを即動する
即動装置、加熱筒内に樹脂材な供給するためのホッパ等
を備える射出ユニツ１−がセラ１〜され、射出ユニツｌ
−は、ノズルから樹脂ポット内に向けて樹脂材を射出す
るが、このとき射出された樹脂材が４１１１脂ポツト内
に渦巻状に充填されるよう射出位置および射出角度が設
定されている。Furthermore, the molding device includes an injection unit that includes a heating cylinder equipped with a heating means, a screw installed in the heating cylinder, an immediate action device that quickly moves the screw, and a hopper for supplying resin material into the heating cylinder. 1- is inserted into the cell 1~, and the injection unit l
-, the resin material is injected from the nozzle into the resin pot, and the injection position and injection angle are set so that the resin material injected at this time fills the 4111 fat pot in a spiral shape.
つまり、後述する如く樹脂材にガラス繊維を混合した場
合、樹脂ボッ１〜内に射出された樹脂洞内の＝３
ガラス繊維は、樹脂ポットの円周方向に略沿うべく配向
されることになり、またガラス繊維の配向の強弱を、上
記ノズルの口径設定により調整できることになる。In other words, when glass fiber is mixed with the resin material as described later, the =3 glass fibers in the resin cavities injected into the resin pots 1 to 1 will be oriented approximately along the circumferential direction of the resin pot. Furthermore, the strength of the orientation of the glass fibers can be adjusted by setting the aperture of the nozzle.
次に、成形装置におけるコンミテータ１の成形方法を説
明する。まず射出ユニットにおいてガラス繊維が混合さ
れた樹脂材の加熱半溶融が行われることになる。そして
ガラス繊維が混練された樹脂材は、ノズルから樹脂ポッ
ト内に射出されるが、射出される樹脂材においてはガラ
ス繊維が射出方向を向き、さらに樹脂材が前述の様に渦
巻状に樹脂ポット内に射出されるため、樹脂ボッＩ・に
おける樹脂材はガラス繊維の向きが略一定して周方向を
向いた予備配向状態となる。続いてプランジャの作動に
より樹脂ポット内の樹脂材をキャビティ内に押し込むこ
とになるが、このとき予備配向されていたガラス繊維の
配向は、略予備配向された状態でキャビティ内に押し込
まれることになる。Next, a method of molding the commutator 1 in the molding device will be explained. First, in the injection unit, the resin material mixed with glass fiber is heated and semi-melted. The resin material kneaded with glass fibers is then injected from the nozzle into the resin pot, but in the injected resin material, the glass fibers are oriented in the injection direction, and the resin material is spirally shaped into the resin pot as described above. Since the resin material in the resin bottle I is injected inward, the resin material in the resin bottle I is in a pre-oriented state in which the orientation of the glass fibers is substantially constant and faces in the circumferential direction. Next, the plunger is operated to push the resin material in the resin pot into the cavity, but at this time, the pre-oriented glass fibers are pushed into the cavity in a substantially pre-oriented state. .
叙述のごとく構成された本発明の実施例において、ガラ
ス繊維が混合された樹脂材は、プランジャによって樹脂
ポットからキャビティ内に押し込まれてコンミテータ１
に成形されることになるが、樹脂材に混合されるガラス
繊維は、射出ユニツ１−から樹脂ポット内に渦巻状に射
出される段階で略周方向を向くべく予備配向されること
になる。従って、歩留まりの良い圧縮成形装置を用いて
コンミテータ１を成形するものでありながら、樹脂材に
混合されるガラス繊維は、無秩序に配向されることなく
、所望の向きに配向されることになり、この結果、真円
度や耐久性に優れたコンミテータ１を低コストで製造す
ることができる。In the embodiment of the present invention constructed as described above, the glass fiber mixed resin material is forced into the cavity from the resin pot by the plunger into the commutator 1.
However, the glass fibers mixed with the resin material are pre-oriented so as to face approximately in the circumferential direction at the stage of being spirally injected into the resin pot from the injection unit 1-. Therefore, although the commutator 1 is molded using a compression molding device with a high yield, the glass fibers mixed into the resin material are not oriented randomly, but are oriented in a desired direction. As a result, the commutator 1 with excellent roundness and durability can be manufactured at low cost.
しかも、移送成形や射出成形において成形されたコンミ
テータ１では、ガラス繊維の配向が周方向に強（、この
ため高温下（樹脂限界温度付近）での回転強度性能や衝
撃強度性能に劣り、特にセグメント付近においては第２
図に示す様にクラックが発生する惧れがあるが、本発明
のものでは、セグメント付近においても適度に配向を乱
し得るため、クラックの発生を防止することができる。Moreover, in the commutator 1 formed by transfer molding or injection molding, the orientation of the glass fibers is strong in the circumferential direction. In the vicinity, the second
As shown in the figure, there is a risk that cracks will occur, but in the case of the present invention, since the orientation can be appropriately disturbed even near the segments, it is possible to prevent the occurrence of cracks.
尚、本発明はコンミテータに限定されるものではなく、
種々の円筒状樹脂成形体に適用できるものである。。Note that the present invention is not limited to commutators,
It can be applied to various cylindrical resin molded bodies. .
［作用効果］
以Ｉ−要するに、本発明は叙述の如く構成されたもので
あるから、ガラス繊維が混合された樹脂材を圧縮成形に
より円筒状樹脂成形体に成形するものでありながら、樹
脂材に混合されるガラス繊維は、樹脂材を予備室に渦巻
状に射出充填することにより予備配向されることになる
。従って、樹脂材に混合されるガラス繊維は、圧縮成形
された段階で従来のように無秩序に配向されることなく
、所望の向きに配向されることになり、この結果、歩留
まりの良い圧縮成形において用途に応した円筒状樹脂成
形体を低コストで製造することができる。[Operations and Effects] In short, since the present invention is configured as described above, although the resin material mixed with glass fiber is molded into a cylindrical resin molded body by compression molding, the resin material The glass fibers to be mixed are pre-oriented by injecting and filling a resin material into a pre-chamber in a spiral manner. Therefore, the glass fibers mixed into the resin material are oriented in the desired direction at the stage of compression molding, instead of being oriented randomly as in conventional methods. Cylindrical resin molded bodies suitable for various uses can be manufactured at low cost.
図面は、本発明に係る円筒状樹脂成形体の成形方法の実
施例を示したものであって、第１図Ａ。
Ｂはそれぞれコンミテータの平面図、正面図、第２図Ａ
、Ｂは本発明のものと従来のものとを比較したコンミテ
ータの拡大断面図である。
図中、１はコンミテータ、１ａはセグメントである。
８
第２図
Ｖラッン −−The drawings show an embodiment of the method for molding a cylindrical resin molded body according to the present invention, and FIG. B is the plan view, front view, and Fig. 2 A of the commutator, respectively.
, B are enlarged sectional views of a commutator according to the present invention and a conventional commutator. In the figure, 1 is a commutator and 1a is a segment. 8 Figure 2 V run --
Claims (1)
ジャ作動によりキャビティ内に押し込んで円筒状樹脂成
形体を圧縮成形するに、上記樹脂材を、予備室に渦巻状
に射出充填して混合ガラス繊維の予備配向を行つた後、
キャビティ内に押し込んで圧縮成形することを特徴とす
る円筒状樹脂成形体の成形方法。The glass fiber mixed resin material filled in the preliminary chamber is pushed into the cavity by plunger operation to compression mold a cylindrical resin molded body.The resin material is injected spirally into the preliminary chamber and mixed glass fiber After performing the preliminary orientation of
A method for molding a cylindrical resin molded body, characterized by compression molding by pushing it into a cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5024290A JPH0780225B2 (en) | 1990-03-01 | 1990-03-01 | Molding method for cylindrical resin molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5024290A JPH0780225B2 (en) | 1990-03-01 | 1990-03-01 | Molding method for cylindrical resin molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03251417A true JPH03251417A (en) | 1991-11-08 |
| JPH0780225B2 JPH0780225B2 (en) | 1995-08-30 |
Family
ID=12853525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5024290A Expired - Fee Related JPH0780225B2 (en) | 1990-03-01 | 1990-03-01 | Molding method for cylindrical resin molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0780225B2 (en) |
-
1990
- 1990-03-01 JP JP5024290A patent/JPH0780225B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0780225B2 (en) | 1995-08-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |