JPS6159215B2 - - Google Patents
Info
- Publication number
- JPS6159215B2 JPS6159215B2 JP12384481A JP12384481A JPS6159215B2 JP S6159215 B2 JPS6159215 B2 JP S6159215B2 JP 12384481 A JP12384481 A JP 12384481A JP 12384481 A JP12384481 A JP 12384481A JP S6159215 B2 JPS6159215 B2 JP S6159215B2
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- mold
- insert
- resin material
- resin
- 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
- 239000011347 resin Substances 0.000 claims description 19
- 229920005989 resin Polymers 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 6
- 238000009751 slip forming Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000005336 cracking Methods 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
- B29C45/14344—Moulding in or through a hole in the article, e.g. outsert moulding
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
Description
【発明の詳細な説明】
本発明はインサート射出成形法の改良に関す
る。本発明の目的は、インサートする磁石が射出
する樹脂圧による割れを防止することにある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in insert injection molding processes. An object of the present invention is to prevent the inserted magnet from cracking due to the resin pressure injected.
本発明の他の目的は、インサートする磁石が歯
車の軸真に対し偏心せず、かつ、軸真の長手方向
に対し、位置ずれを起さずに、インサート成形出
来ることにある。本発明の更に他の目的は、イン
サートする磁石と金型が型締め、特に壊すことを
防止することにある。 Another object of the present invention is to be able to perform insert molding without eccentricity of the inserted magnet with respect to the axis of the gear and without positional deviation in the longitudinal direction of the axis. Still another object of the present invention is to prevent the inserted magnet and the mold from being clamped together, especially from being broken.
従来は、第１図に示すごとく、下型に磁石を給
材し、上型１が閉じることにより、磁石３を金型
にて位置決めし、樹脂をゲート２より射出するこ
とにより、磁石をインサートした小型歯車４を射
出成形する方法を取つていた。この方法は第１図
のＡ−A′断面を第３図に示すが、ドーナツ形磁
石３の穴に樹脂が射出され、その樹脂圧により、
もろい磁石が割れる欠点があつた。また、磁石を
上下の金型で直接挾むため、磁石と金型のハメア
イがきつすぎた場合に、磁石の割れ、カケが生じ
る欠点があつた。 Conventionally, as shown in Fig. 1, a magnet is fed into the lower mold, the upper mold 1 is closed, the magnet 3 is positioned in the mold, and resin is injected from the gate 2 to insert the magnet. A method of injection molding the small gear 4 was used. In this method, the A-A' cross section of FIG. 1 is shown in FIG. 3, resin is injected into the hole of the donut-shaped magnet 3, and due to the resin pressure,
The problem was that the magnet was fragile and could break. In addition, since the magnet is directly sandwiched between the upper and lower molds, if the fit between the magnet and the mold is too tight, the magnet may crack or chip.
従来からの他のインサート成形法は、第２図に
示す方法で、磁石と金型の間にスキマを設け、磁
石を樹脂で包む方法である。この方法は、前述し
た磁石の割れ、カケがない代りに、第２図のＢ−
B′断面を第４図に示すが、磁石３が歯車真に対し
偏心し、小型歯車４が重量的にアンバランスにな
ると同時に、磁石とステータとのギヤツプのバラ
ツキが大となり、ロータ歯車として機能が損われ
る欠点を有していた。 Another conventional insert molding method is the method shown in FIG. 2, in which a gap is provided between the magnet and the mold, and the magnet is wrapped in resin. This method eliminates the cracking and chipping of the magnet described above, but instead
The cross section B' is shown in Figure 4, and the magnet 3 becomes eccentric with respect to the gear stem, causing the small gear 4 to become unbalanced in terms of weight, and at the same time, the gap between the magnet and the stator becomes large, so that it functions as a rotor gear. It had the disadvantage that it was damaged.
本発明はかかる欠点と除去したものであり、実
施例を第５図から第１０図を用いて説明する。 The present invention eliminates these drawbacks, and embodiments thereof will be explained using FIGS. 5 to 10.
第５図は第１図と同様な金型によりドーナツ型
の磁石１３と射出成形歯車１４をインサート成形
したものである。第１図の方法と異なる点は本発
明では磁石外面の１部を樹脂材で等間隔に包み、
１部に磁石外面が露出した部分を有することであ
る。第６図は第５図の平面図であり射出成形歯車
１４は磁石外面を包む樹脂材１４ａが等間隔に配
置され、それらの間には磁石が露出する部分１３
ａを有する。第６図で磁石及び樹脂材の外側に斜
線で示すのが金型１５である。この場合磁石１４
は金型１５に位置決めされるので射出成形加工時
に磁石の移動がなく中心出しが確実に達成でき、
また磁石外面を包む樹脂材１４ａも分割されて配
置されることにより、インサート時に磁石の貫通
穴方向に大きな力が作用せず、割れの問題も解決
されている。更に磁石の中心出しが確実にされ、
且つ磁石外面を包む樹脂材１４ａが等間隔に分割
されて設けられているのでバランスの良いロータ
を提供できるものである。 In FIG. 5, a donut-shaped magnet 13 and an injection molded gear 14 are insert-molded using a mold similar to that shown in FIG. The difference from the method shown in FIG. 1 is that in the present invention, a part of the outer surface of the magnet is wrapped with resin material at equal intervals.
One part has a portion where the outer surface of the magnet is exposed. FIG. 6 is a plan view of FIG. 5, and the injection-molded gear 14 has resin materials 14a that wrap around the outer surface of the magnet arranged at equal intervals, and a portion 13 where the magnet is exposed between them.
It has a. In FIG. 6, the mold 15 is indicated by diagonal lines outside the magnet and resin material. In this case magnet 14
Since the magnet is positioned in the mold 15, there is no movement of the magnet during the injection molding process, and centering can be achieved reliably.
Further, since the resin material 14a that covers the outer surface of the magnet is also divided and arranged, a large force is not applied in the direction of the through hole of the magnet during insertion, and the problem of cracking is also solved. Furthermore, the centering of the magnet is ensured,
In addition, since the resin material 14a surrounding the outer surface of the magnet is divided into equal intervals, a well-balanced rotor can be provided.
第７図及び第８図は、本発明のバリエーシヨン
である。第９図は、磁石における軸方向の位置決
めをピンにて行い、磁石の偏心は金型で行う方法
である。本発明のバリエーシヨンは、第１０図ま
でに限定されるものではない。 7 and 8 are variations of the invention. FIG. 9 shows a method in which the axial positioning of the magnet is performed using pins, and the eccentricity of the magnet is performed using a mold. The variations of the present invention are not limited to those shown in FIG.
以上の如く本発明によれば、ドーナツ形磁石の
外面の複数箇所を等間隔に樹脂材によつて包囲す
るとともに、インサート時に磁石外面の樹脂材が
配置されない部分を金型で支持した状態で、磁石
外面の樹脂材と磁石の円周面を貫通する小歯車と
をインサート成形により連続して１本に形成した
ものであり、磁石の中心出しが金型により確実に
行なわれ、且つ磁石外面を包む樹脂材が等間隔に
配置されて設けられているので、バランスが良
く、しかもインサート時の樹脂材による加圧力が
少なくなるので破損の少ないロータを量産性良く
製造し得るものである。 As described above, according to the present invention, a plurality of locations on the outer surface of the donut-shaped magnet are surrounded by the resin material at equal intervals, and the portions of the outer surface of the magnet where the resin material is not placed are supported by a mold during insertion. The resin material on the outer surface of the magnet and the small gear that passes through the circumferential surface of the magnet are continuously formed into one piece by insert molding. Since the enclosing resin materials are arranged at equal intervals, the rotor is well-balanced, and since the pressure applied by the resin material during insertion is reduced, rotors with less damage can be manufactured with good mass productivity.
第１図は従来の実施例であるインサート金型の
断面図であり、第２図は従来の他の実施例である
インサート部品の断面図である。第３図は第１図
のＡ−A′断面図であり、第４図は第２図のＢ−
B′断面図である。第５図は本発明の実施例を示す
インサート成形部品の断面図であり、第６図、第
７図、第８図は第５図の歯車軸方向より見た平面
図であり、第９図は、本発明のさらに他の実施例
を示すインサート金型の断面図であり、第１０図
は第９図の部品の平面図である。
１……上型、２……ピンポイントゲート、３，
１３……磁石、４，１４……射出成形歯車、５…
…下型、６……位置決めピン。
FIG. 1 is a sectional view of an insert mold according to a conventional embodiment, and FIG. 2 is a sectional view of an insert part according to another conventional embodiment. Figure 3 is a sectional view taken along line A-A' in Figure 1, and Figure 4 is a cross-sectional view taken along line B-- in Figure 2.
B′ cross-sectional view. FIG. 5 is a sectional view of an insert molded part showing an embodiment of the present invention, FIGS. 6, 7, and 8 are plan views seen from the gear axis direction of FIG. 5, and FIG. 10 is a cross-sectional view of an insert mold showing still another embodiment of the present invention, and FIG. 10 is a plan view of the component shown in FIG. 9. 1...Upper mold, 2...Pinpoint gate, 3,
13... Magnet, 4, 14... Injection molded gear, 5...
...Lower mold, 6...Positioning pin.
Claims (1)
形成される小歯車とをインサート成形によつて１
体にしてなるロータのインサート方法において、
前記磁石の外面の複数箇所を等間隔に前記樹脂材
によつて包囲するとともに、前記磁石外面の樹脂
材と前記磁石の内周面を貫通する前記小歯車と
は、前記樹脂材が配置されていない前記磁石外面
をインサート金形で直接支持した状態でインサー
ト成形することにより連続して１体に形成された
ことを特徴とするロータのインサート成形法。1 A donut-shaped magnet and a small gear made of resin are assembled into 1 by insert molding.
In the rotor insert method,
A plurality of locations on the outer surface of the magnet are surrounded by the resin material at equal intervals, and the resin material is arranged on the small gear that passes through the resin material on the outer surface of the magnet and the inner peripheral surface of the magnet. A method for insert molding a rotor, characterized in that the outer surface of the magnet is continuously formed into one body by insert molding with the outer surface of the magnet directly supported by an insert mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12384481A JPS5825931A (en) | 1981-08-07 | 1981-08-07 | Insert molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12384481A JPS5825931A (en) | 1981-08-07 | 1981-08-07 | Insert molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5825931A JPS5825931A (en) | 1983-02-16 |
| JPS6159215B2 true JPS6159215B2 (en) | 1986-12-15 |
Family
ID=14870784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12384481A Granted JPS5825931A (en) | 1981-08-07 | 1981-08-07 | Insert molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5825931A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61134216A (en) * | 1984-12-05 | 1986-06-21 | Sumitomo Bakelite Co Ltd | Manufacture of composite molded article of plastic magnet |
| JPS6284227A (en) * | 1985-10-09 | 1987-04-17 | Hitachi Ltd | Air flow rate regulating mechanism of gas turbine combustor |
| JPS63104808A (en) * | 1986-10-23 | 1988-05-10 | Daicel Chem Ind Ltd | Manufacture of optical disk |
| JP3463641B2 (en) * | 2000-01-21 | 2003-11-05 | 株式会社デンソー | Manufacturing method of pressure detector |
-
1981
- 1981-08-07 JP JP12384481A patent/JPS5825931A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5825931A (en) | 1983-02-16 |
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