JPS6023014B2 - Injection molding method for record discs - Google Patents
Injection molding method for record discsInfo
- Publication number
- JPS6023014B2 JPS6023014B2 JP14497079A JP14497079A JPS6023014B2 JP S6023014 B2 JPS6023014 B2 JP S6023014B2 JP 14497079 A JP14497079 A JP 14497079A JP 14497079 A JP14497079 A JP 14497079A JP S6023014 B2 JPS6023014 B2 JP S6023014B2
- Authority
- JP
- Japan
- Prior art keywords
- center
- resin
- mold
- hole
- record
- 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
- 238000001746 injection moulding Methods 0.000 title claims description 7
- 229920005989 resin Polymers 0.000 claims description 29
- 239000011347 resin Substances 0.000 claims description 29
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 description 5
- 238000004080 punching Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は、レコード盤の射出成形法に関し、樹脂により
レコード盤を成形する際、同時にその中央部に中心孔を
穿設する方法の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection molding method for record discs, and relates to an improvement in the method of simultaneously drilling a center hole in the center of a record disc when molding it with resin.
一対の成形型の間に一定量の樹脂を射出し、両成形型を
突き合わせることによってレコード盤を成形する方法に
おいては、一方の型にセンターピンを設け、成形時にこ
れを移動させることによって、レコード盤に中心孔を穿
設することができる。レコード盤成形後に中心孔を打ち
抜く場合は、盤の硬さにより中心孔周縁に打ち抜きバリ
や欠けを生じ易く、その後処理等も考慮しなくてはなら
ないが、前記の方法によれば、このような不都合はない
。In the method of molding a record by injecting a certain amount of resin between a pair of molds and butting the two molds together, one mold is provided with a center pin and this is moved during molding. A center hole can be drilled into the record. When punching out a center hole after forming a record, punching burrs and chips are likely to occur around the center hole due to the hardness of the record, and post-processing must also be taken into consideration. There is no inconvenience.
ところが、射出する樹脂の温度が低く硬い場合には、こ
れを押し出そうとしても一方の金型のセンターピソに阻
害されて規定量押し出せなかったり、あるいは一対の金
型間の間隔が広過ぎる場合には、射出される樹脂がセン
ターピンの先端に当たった後、その重みで下方へたれた
りすることがある。However, if the temperature of the resin to be injected is low and hard, even if you try to extrude it, it will be blocked by the center piso of one of the molds and you will not be able to extrude the specified amount, or the gap between the pair of molds will be too wide. In some cases, the injected resin may sag downward due to its weight after hitting the tip of the center pin.
このような状態では樹脂を連続的にプレスすることはで
きず、又仮にできたとしてもしコード盤の厚さは一定で
なく、金型の下部に位遣していた部分が厚く、上部に位
置していた部分は薄くなるという偏肉現象や成形不良が
生じてレコード盤として品質上好ましいものではない。
本発明は、このような問題をなくし、作業性よく、高品
質のレコード盤を得る方法を提供するものである。Under such conditions, it is not possible to press the resin continuously, and even if it were possible, the thickness of the cord board would not be constant, and the part placed at the bottom of the mold would be thick, and the part placed at the top would be thick. This is not desirable in terms of quality as a record disc, as the thinner parts become thinner, resulting in uneven thickness and molding defects.
The present invention eliminates such problems and provides a method for obtaining high-quality records with good workability.
本発明は、一対のレコード盤成形型のうち、一方の型の
中心部に樹脂射出孔とこの孔をとり囲み外径が所望とす
るレコード盤中心孔径を有する短５い筒体を設け、他方
の型の中心部には先端に円錐形部を有するセンターピン
をその摺動孔に進退自在に設け、これら一対の成形型に
よってレコ−ド盤を成形し、同時にその中心部に所定の
大きさの中心孔を穿設するものである。The present invention provides a resin injection hole in the center of one of a pair of record molding molds, and a short cylindrical body surrounding this hole and having an outer diameter having a desired record center hole diameter, and the other A center pin with a conical tip at the tip is installed in the center of the mold so that it can move forward and backward into the sliding hole, and these pair of molds mold a record disc, and at the same time, a center pin with a predetermined size is placed in the center of the mold. A central hole is drilled in the hole.
以下、本発明の射出成形法を図により説明する。Hereinafter, the injection molding method of the present invention will be explained with reference to the drawings.
第１図は熱可塑性樹脂を射出する前の一対の成形型を示
す。図中１は可動側金型で、一枚の例えばＡ面用レ−ベ
ル２がセンター３に進退自在に設けられたセンターピン
４の先端に装着されている。５はセンターピン４に一定
の圧力を加えてその先端を３〜４肋センター３より前方
に突出させるエアーシリンダーである。FIG. 1 shows a pair of molds before injection of thermoplastic resin. In the figure, reference numeral 1 denotes a movable mold, in which a single label 2 for the A side, for example, is attached to the tip of a center pin 4 provided at a center 3 so as to be movable forward and backward. Reference numeral 5 denotes an air cylinder that applies a certain pressure to the center pin 4 to cause its tip to protrude forward from the 3rd to 4th rib center 3.
６は固定側金型で、その中央部にセンター７がねじ固定
されていて、可動側金型１と対向するその中心部には、
樹脂射出孔８とこの孔ををとり囲み外径が所望とするレ
コード盤中心孔と同寸法の筒体９を４〜５柳前方へ突出
するように設けた樹脂供給ノズル１０を配してある。Reference numeral 6 denotes a fixed side mold, to the center of which a center 7 is fixed with a screw, and in the center facing the movable side mold 1,
A resin injection nozzle 10 is disposed surrounding the resin injection hole 8 and projecting forward from a cylindrical body 9 having the same outer diameter as the desired center hole of the record. .
ノズル１０の内部には、加熱溶融後適度に保たれた粘士
状の樹脂Ｒ、例えば塩化ビニル樹脂を押し出すスクリュ
ー１１が設けられている。筒体９には例えばＢ面用レー
ベル２′が抜け落ちることのないよう装着されている。A screw 11 is provided inside the nozzle 10 for pushing out a viscous resin R, such as a vinyl chloride resin, which is maintained at an appropriate level after being heated and melted. For example, a B-side label 2' is attached to the cylinder 9 so as not to fall off.
１２，１２′はそれぞれの金型の対向面にスタンバ−押
えリング１３，１３′によって固定された円盤状スタン
パ−であって、その外面にはそれぞれ音溝形成用の微小
突条（図示せず）が形成されている。Reference numerals 12 and 12' denote disc-shaped stampers fixed to the opposing surfaces of the respective molds by stambar holding rings 13 and 13', and each of the outer surfaces thereof has minute protrusions (not shown) for forming sound grooves. ) is formed.
１４，１４′はスタンパー押えリング１３，１３′を金
型１，６にそれぞれ固定する取付ねじ、１５はセンター
ピン４の摺敷孔である。Reference numerals 14 and 14' designate mounting screws for fixing the stamper holding rings 13 and 13' to the molds 1 and 6, respectively, and 15 designates a sliding hole for the center pin 4.
なお、センターピン４は、固定側金型６に設けたレコー
ド盤の中心孔形成のための筒体９の端面と確実に突き合
うよう円錐形部１６の根本にリング状平坦部１７を形成
している。In addition, the center pin 4 has a ring-shaped flat part 17 formed at the base of the conical part 16 so as to surely butt against the end surface of the cylinder 9 provided in the stationary mold 6 for forming the center hole of the record. ing.
この射出成形金型を用いてレコード盤を形成するには、
まず一定量の樹脂を射出孔８よりセンターピン４側に第
１図Ｒ′に示すようにだんご状に射出した後、可動側金
型１を固定側金型６側に押しつける。To form a record using this injection mold,
First, a certain amount of resin is injected from the injection hole 8 toward the center pin 4 in a dumpling shape as shown in FIG. 1 R', and then the movable mold 1 is pressed against the fixed mold 6.
金型１の移動に伴いだんご状の樹脂はプレスされレーベ
ル２，２′と接してこれを表面部に埋め込んだ壮０態で
円盤状スタンパー１２，１２′の周綾部に広がってゆく
。この樹脂のプレス過程で、固定側金型６の筒体９の端
面は、可動側金型１の移動につれてセンターピン４先端
のリング状平坦部１７と突き合わされ、金型１の移動に
より相対的に移動してェアシリンダ−６により一定圧力
が加えられたセンターピン４を後退させるとともに、こ
のピン４の摺動孔１５先端内に１〜２肋程入り込む。こ
の第２図に示す状態でだんご状樹脂は一定厚さをもった
レコ−ド盤Ｒ″にプレスされると同時に、その中心部に
筒体９とこれが入り込むピン摺敷孔１５とによるポンチ
とダイスとの打ち抜き作０用により所筆とするレコード
盤の中心孔がバリや欠けを生じることなく形成すること
ができる。As the mold 1 moves, the dumpling-shaped resin is pressed and comes into contact with the labels 2, 2', and spreads around the periphery of the disk-shaped stampers 12, 12' in a state where it is embedded in the surface. During this resin pressing process, the end surface of the cylindrical body 9 of the stationary mold 6 abuts against the ring-shaped flat part 17 at the tip of the center pin 4 as the movable mold 1 moves, and as the mold 1 moves, the end surface of the cylindrical body 9 The center pin 4 to which a constant pressure is applied by the air cylinder 6 is moved back, and the pin 4 enters the tip of the sliding hole 15 by about one or two ribs. In the state shown in FIG. 2, the dumpling-shaped resin is pressed into a record disc R'' having a certain thickness, and at the same time, a punch is formed in the center of the cylinder 9 and a pin-sliding hole 15 into which the cylinder 9 is inserted. Due to the zero punching action with the die, the center hole of the record disc can be formed without causing burrs or chips.
また、金型１のセンターピン４の先端には、円錐形部１
６を設けているので、樹脂の射出を阻害することなく、
しかもこの樹脂をセンターピンをとりまく全周に分布さ
せることができる。すなわち、樹脂射出孔８より射出さ
れる樹脂は第１図及び第３図に矢印で示すように、円錐
形部１６の先端に当たってその全周に均等に分布する。
従って、射出する樹脂の温度が低かったり、その硬度が
所望値よりも若干高かったりする場合でも、センターピ
ン４の先端周囲に一定量均一分布の状態で供給できる。Furthermore, a conical portion 1 is provided at the tip of the center pin 4 of the mold 1.
6, so the injection of resin is not obstructed.
Moreover, this resin can be distributed all around the center pin. That is, the resin injected from the resin injection hole 8 hits the tip of the conical portion 16 and is evenly distributed over its entire circumference, as shown by arrows in FIGS. 1 and 3.
Therefore, even if the temperature of the injected resin is low or its hardness is slightly higher than the desired value, a constant amount of resin can be uniformly distributed around the tip of the center pin 4.
上記の射出成形方法によると、２回目以後の成形におい
て射出孔から射出される樹脂は、先端に円錐形部１６の
残跡としての凹部１８が形成されているので、射出時に
この凹部１８が円錐形部１６に当たってセンターピンの
全周方向への樹脂の分布を助長する作用があり、従って
偏肉のない厚みの均一な高品質のレコード盤を連続的に
射出成形することができる。以上のように本発明の射出
成形法によれば、レコード盤の成形と同時にその中′Ｑ
孔の穿孔を行なうことができるものであり、穿孔に伴う
バリや孔周囲の欠け等を生じることなく、隅肉のない、
厚みの均一な高品質のレコード盤を作業性よく製造する
ことができるという利点がある。According to the above injection molding method, the resin injected from the injection hole in the second and subsequent moldings has a concave portion 18 formed at the tip as a remnant of the conical portion 16, so that the concave portion 18 becomes conical during injection. The contact with the shaped portion 16 has the effect of promoting the distribution of the resin in the entire circumferential direction of the center pin, so that it is possible to continuously injection mold high quality records with uniform thickness and no thickness deviation. As described above, according to the injection molding method of the present invention, at the same time as the record disc is being molded,
It is capable of drilling holes, without causing burrs or chips around the hole, and without fillets.
This method has the advantage that high-quality records with uniform thickness can be manufactured with good workability.
第１図は本発明の実施例に用いた一対の成形型の樹脂射
出前の状態を示す縦断面図、第２図はしコード盤成形時
の縦断面図、第３図はセンターピンの正面図である。
１・・・・・・可動側金型、４・・・・・・センターピ
ン、６・・・・・・固定側金型、８・・・・・・樹脂射
出孔、９・・・・・・射出孔をとり囲む筒体、１０……
樹脂供給ノズル、Ｉ２，１２′・・・・・・成形用スタ
ンパ−、１５・・・・・・センターピンの摺動孔、１６
・・・・・・円錐形部、１７・・・・・・・・・リング
状平坦部。
第１図
第２図
第３図Fig. 1 is a longitudinal sectional view showing the state of a pair of molds used in the embodiment of the present invention before resin injection, Fig. 2 is a longitudinal sectional view during cord board molding, and Fig. 3 is a front view of the center pin. It is a diagram. 1... Movable side mold, 4... Center pin, 6... Fixed side mold, 8... Resin injection hole, 9... ... Cylindrical body surrounding the injection hole, 10...
Resin supply nozzle, I2, 12'... Molding stamper, 15... Center pin sliding hole, 16
......Conical part, 17......Ring-shaped flat part. Figure 1 Figure 2 Figure 3
Claims (1)
とするレコード盤中心孔径を有する筒体とを設けた一方
の型と、先端に円錐形部を有するセンターピンを中心部
の摺動孔に進退自在に設けた他方の型とを、前記センタ
ーピンを前部へ突出させて対向させ、前記樹脂射出孔よ
り成形用樹脂を前記センターピンに向けて射出した後、
両成形型を突き合わせて前記樹脂を盤状に成形するとと
もに、前記筒体端部を他方の型のセンターピン摺動孔に
嵌入させることを特徴としたレコード盤の射出成形法。 ２ 前記センターピンが、前記円錐形部の根本部に前記
筒体端面と突き合わされるリング状平坦部を有する特許
請求の範囲第１項記載のレコード盤の射出成形法。[Scope of Claims] 1. One mold provided with a resin injection hole in the center and a cylindrical body surrounding this hole and having an outer diameter having the desired record center hole diameter, and a center having a conical portion at the tip. The other mold, in which a pin was provided in a sliding hole in the center so as to be movable back and forth, was placed facing the other mold with the center pin protruding toward the front, and molding resin was injected toward the center pin from the resin injection hole. rear,
An injection molding method for a record disc, characterized in that the resin is molded into a disc shape by butting both molds together, and the end of the cylindrical body is fitted into a center pin sliding hole of the other mold. 2. The injection molding method for a record disc according to claim 1, wherein the center pin has a ring-shaped flat part at the root of the conical part that abuts against the end surface of the cylindrical body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14497079A JPS6023014B2 (en) | 1979-11-08 | 1979-11-08 | Injection molding method for record discs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14497079A JPS6023014B2 (en) | 1979-11-08 | 1979-11-08 | Injection molding method for record discs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5669125A JPS5669125A (en) | 1981-06-10 |
| JPS6023014B2 true JPS6023014B2 (en) | 1985-06-05 |
Family
ID=15374424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14497079A Expired JPS6023014B2 (en) | 1979-11-08 | 1979-11-08 | Injection molding method for record discs |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6023014B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61162957A (en) * | 1984-11-16 | 1986-07-23 | バルタ− ベツク | Method and apparatus for sucking secreting liquid from wound |
| JPS63255053A (en) * | 1987-03-23 | 1988-10-21 | リチャード、ジェー、ヤーガー | Sleeve of suction device for surgical operation |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01146715A (en) * | 1987-12-02 | 1989-06-08 | Meiki Co Ltd | Mold for disc base |
| JPH01159226A (en) * | 1987-12-17 | 1989-06-22 | Meiki Co Ltd | Molding tool for disc board |
| CN107672123B (en) * | 2017-11-14 | 2023-11-10 | 东莞德威铸造制品有限公司 | In-mold forming die and ejection mechanism thereof |
-
1979
- 1979-11-08 JP JP14497079A patent/JPS6023014B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61162957A (en) * | 1984-11-16 | 1986-07-23 | バルタ− ベツク | Method and apparatus for sucking secreting liquid from wound |
| JPS63255053A (en) * | 1987-03-23 | 1988-10-21 | リチャード、ジェー、ヤーガー | Sleeve of suction device for surgical operation |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5669125A (en) | 1981-06-10 |
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