JPH0935373A - Guide roller, mold for injection molding for molding the guide roller and injection molding method - Google Patents

Guide roller, mold for injection molding for molding the guide roller and injection molding method

Info

Publication number
JPH0935373A
JPH0935373A JP7179245A JP17924595A JPH0935373A JP H0935373 A JPH0935373 A JP H0935373A JP 7179245 A JP7179245 A JP 7179245A JP 17924595 A JP17924595 A JP 17924595A JP H0935373 A JPH0935373 A JP H0935373A
Authority
JP
Japan
Prior art keywords
guide roller
gate
cavity
peripheral surface
outer peripheral
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.)
Pending
Application number
JP7179245A
Other languages
Japanese (ja)
Inventor
Yoshinobu Takeda
与志信 武田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Materials Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Priority to JP7179245A priority Critical patent/JPH0935373A/en
Publication of JPH0935373A publication Critical patent/JPH0935373A/en
Pending legal-status Critical Current

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Landscapes

  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain a guide roller formed with prescribed surface roughness on the outer peripheral surface of molded goods without using mechanical polishing. SOLUTION: A molten resin 13 is injected and packed into the cavity A of molds clamped under a low pressure via a sprue 3, a runner 4 and a gate 5. The molten resin in the cavity A flows backward to the gate 5 side as shown by an arrow and the outer peripheral surface of the molded goods 1 and the gate 5 are disconnected when a cavity sleeve 8 is lowered by high pressure until the sleeve passes the gate 5. The surface roughness of the surface 11 for forming the outer periphery of the molded goods of a moving side mold plate 7 is set at 0.2-S and is transferred to the outer peripheral surface of the molded goods 1. Since there is no trace of the gate on the outer peripheral surface, the use of the molded goods 1 by mounting the molded goods as they are on a projector, etc., is possible. Since the high-pressure mold clamping is executed after the low-pressure mold clamping, the variation in the weight and density of the molded goods 1 is prevented.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、例えば、８ミリビ
デオ映写機等において磁気テープを案内するために用い
られるガイドローラーに関する。また、本発明は、前記
ガイドローラーを成形するための射出成形金型および射
出成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide roller used for guiding a magnetic tape in, for example, an 8 mm video projector. The present invention also relates to an injection molding die and an injection molding method for molding the guide roller.

【０００２】[0002]

【従来の技術】従来、この種のガイドローラーとして
は、一般的に、型締めされた金型内のキャビティに、溶
融樹脂を射出充填して、一体成形して得られるものがあ
る。2. Description of the Related Art Conventionally, as a guide roller of this type, there is generally one that is obtained by injection molding a molten resin into a cavity in a mold that has been clamped and integrally molding the resin.

【０００３】ところで、このようなガイドローラーを射
出成形するには、型締めした金型内に溶融樹脂を射出し
て充填し、冷却後、突き出しピンにより成形品を突き出
すことにより、ランナのゲートと成形品の外周面とを切
断分離するようにしている。そして、成形品であるガイ
ドローラーは、その外周面にテープが摺接して走行する
ため、ガイドローラの外周面に金型のゲートが通じてい
たことに鑑みて、射出成形後に、この外周面のゲート跡
を、精密旋盤により研削加工して仕上げていた（ゲート
処理加工）。By the way, in order to perform injection molding of such a guide roller, molten resin is injected and filled in a mold which has been clamped, and after cooling, a molded product is ejected by an ejector pin to form a runner gate. The outer peripheral surface of the molded product is cut and separated. Since the guide roller, which is a molded product, travels with the tape slidingly contacting the outer peripheral surface of the guide roller, in view of the fact that the gate of the mold is communicated with the outer peripheral surface of the guide roller, after injection molding, the outer peripheral surface of the guide roller is The gate trace was finished by grinding with a precision lathe (gate processing).

【０００４】[0004]

【発明が解決しようとする課題】しかしながら、上述の
とおり従来のガイドローラは、射出成形後に、その外周
面を研磨しなければならないために（ゲート処理加
工）、コストが嵩む上に、生産性も低下するという問題
点がある。また、樹脂を機械研磨しても表面粗さを約３
−Ｓ以上には滑らかに仕上げることができず、このた
め、テープに傷が付くという問題点もある。However, as described above, in the conventional guide roller, since the outer peripheral surface of the guide roller has to be polished after injection molding (gate processing), the cost is high and the productivity is high. There is a problem that it decreases. Even if the resin is mechanically polished, the surface roughness is about 3
There is also a problem in that the tape cannot be finished more smoothly than -S and thus the tape is scratched.

【０００５】また、従来の射出成形方法では、射出充填
後に成形品に何等圧力を加えるものではないので、加熱
溶解樹脂の体積収縮や充填量のばらつきにより、多数の
成形品における成形品の重量のばらつきや１つの成形品
内における密度のばらつきが発生し、結果的に、反りが
発生するとともに、硬度も劣るという問題点がある。Further, in the conventional injection molding method, since no pressure is applied to the molded product after injection and filling, the volumetric shrinkage of the heat-melted resin and the variation in the filling amount cause the weight of the molded product in many molded products to be reduced. There is a problem that variations and density variations within one molded product occur, resulting in warpage and poor hardness.

【０００６】本発明は、上記従来技術の有する問題点に
鑑みてなされたものであり、成形品の外周面が、機械研
磨によらずに所定の表面粗さとなっている、テープに損
傷を及ぼさないガイドローラーを提供することを目的と
している。また、本発明の他の目的は、成形品の重量や
密度がばらつかずに、生産性の高い、射出成形金型およ
び射出成形方法を提供することにある。The present invention has been made in view of the above-mentioned problems of the prior art. The outer peripheral surface of the molded product has a predetermined surface roughness without mechanical polishing, and the tape is damaged. Aims to provide no guide rollers. Another object of the present invention is to provide an injection molding die and an injection molding method which are highly productive without variations in the weight and density of molded products.

【０００７】[0007]

【課題を解決するための手段】上記目的を達成するため
の本発明のガイドローラーは、射出成形により樹脂で一
体成形されて外周面の表面粗さが３．０−Ｓ以下になっ
ていることを特徴とするものである。The guide roller of the present invention for achieving the above object is integrally molded with resin by injection molding so that the outer peripheral surface has a surface roughness of 3.0-S or less. It is characterized by.

【０００８】また、本発明の射出成形金型は、ガイドロ
ーラーを形成するためのキャビティを有し、かつゲート
がパーティング面上に位置することを特徴とするもので
ある。さらに、本発明の射出成形方法は、キャビティの
周面の表面粗さが３．０−Ｓ以下になっている本発明の
金型を用い、前記金型を低圧型締め力により型締めする
工程と、型締めした前記金型のキャビティ内に溶融樹脂
を射出して充填する工程と、射出後に、前記金型を高圧
型締め力により型締めして、成形品の外周面とゲートと
を切り離す工程と、を有することを特徴とするものであ
る。The injection mold of the present invention is characterized by having a cavity for forming a guide roller and having a gate located on the parting surface. Furthermore, in the injection molding method of the present invention, a step of clamping the die with a low pressure die clamping force using the die of the present invention in which the surface roughness of the peripheral surface of the cavity is 3.0-S or less. And a step of injecting and filling molten resin into the cavity of the die that has been clamped, and after the injection, the die is clamped by a high-pressure clamping force to separate the outer peripheral surface of the molded product from the gate. And a process.

【０００９】以下、本発明の作用について説明する。上
記のとおりに構成された請求項１に記載の発明では、射
出成形方法により得られた成形品の外周面（取付面）の
表面粗さが３．０−Ｓ以下になっているので、ゲート処
理加工といった後加工を行うことなく、成形品をそのま
ま使用できる。The operation of the present invention will be described below. In the invention according to claim 1 configured as described above, since the surface roughness of the outer peripheral surface (mounting surface) of the molded product obtained by the injection molding method is 3.0-S or less, the gate is formed. The molded product can be used as it is without post-processing such as processing.

【００１０】請求項２および請求項３に記載の発明で
は、予め、成形品であるガイドローラーを形成するキャ
ビティの周面を表面粗さ３．０−Ｓ以下に研磨してお
く。 そして、前記金型を低圧型締め力により型締め
し、ここで、型締めした前記金型のキャビティ内に溶融
樹脂を射出して充填する。射出充填後に、前記金型を高
圧型締め力により型締めして、成形品の外周面とゲート
部とを切断分離する。この際、キャビティ内の樹脂は圧
縮されてゲート側へ逆流し、キャビティ内の樹脂量が定
量になるとともに、キャビティ内の樹脂には高圧力が及
ぼされる。According to the second and third aspects of the present invention, the peripheral surface of the cavity forming the guide roller, which is a molded product, is ground to a surface roughness of 3.0-S or less in advance. Then, the mold is clamped by a low-pressure mold clamping force, and the molten resin is injected and filled in the cavity of the mold that has been clamped. After injection and filling, the die is clamped by a high-pressure clamping force to cut and separate the outer peripheral surface of the molded product and the gate portion. At this time, the resin in the cavity is compressed and flows back to the gate side, the amount of resin in the cavity becomes a fixed amount, and high pressure is exerted on the resin in the cavity.

【００１１】[0011]

【発明の実施の形態】次に、本発明の一実施例について
図面を参照して説明する。図１は本発明のガイドローラ
ーの射出成形方法の実施に使用する金型の要部断面図、
図２は本発明のガイドローラーの一実施例の縦断面図で
ある。BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a main part of a mold used for carrying out an injection molding method of a guide roller of the present invention,
FIG. 2 is a vertical sectional view of an embodiment of the guide roller of the present invention.

【００１２】先ず、図１に示すように、金型について
は、符号６および７はそれぞれ固定側型板および可動側
型板をそれぞれ示し、固定側型板６にはキャビティスリ
ーブ８およびキャビティピン１２が設けられ、可動側型
板７にはコア９および複数の突き出しピン１０ａ，１０
ｂが設けられている。キャビティスリーブ８、キャビテ
ィピン１２および可動側型板７の成形品外周形成面１１
（図３も参照）とで囲まれた空間は、成形品１（図２の
ガイドローラー）を型取るキャビティＡ（図３参照）に
なっている。可動側型板７の成形品外周形成面１１（図
３も参照）の表面粗さは、３．０−Ｓ以下、本実施例で
は０．２−Ｓになるように、予め研磨されている。符号
１０ａ，１０ｂで示すものは、成形品１の端面を突き出
すための突き出しピンをそれぞれ示している。First, as shown in FIG. 1, with respect to the mold, reference numerals 6 and 7 respectively indicate a fixed side mold plate and a movable side mold plate, and the fixed side mold plate 6 has a cavity sleeve 8 and a cavity pin 12 respectively. And the movable side mold plate 7 is provided with a core 9 and a plurality of ejection pins 10a, 10
b is provided. Cavity sleeve 8, cavity pin 12, and movable-side mold plate 7 molded article outer peripheral surface 11
The space surrounded by (see also FIG. 3) is a cavity A (see FIG. 3) for molding the molded product 1 (guide roller in FIG. 2). The surface roughness of the molded product outer peripheral surface 11 (see also FIG. 3) of the movable mold plate 7 is preliminarily polished so as to have a surface roughness of 3.0-S or less, 0.2-S in this embodiment. . Reference numerals 10a and 10b respectively denote ejection pins for ejecting the end surface of the molded product 1.

【００１３】そして、図示しない射出成形機より射出さ
れた溶融樹脂１３が、スプルー３、ランナー４およびゲ
ート５を介して、前記キャビティＡ内に充填されるよう
に構成されている。ゲート５は金型のパーティング面Ｐ
上にある。The molten resin 13 injected from an injection molding machine (not shown) is filled in the cavity A through the sprue 3, runner 4 and gate 5. Gate 5 is the parting surface P of the mold
It is above.

【００１４】図２に示すように、本発明のガイドローラ
ー（成形品）１は、射出成形により樹脂で一体成形され
た、８ミリビデオ映写機等において磁気テープを案内す
るために用いられものであって、軸方向に軸孔１ａを有
し、外周面１ｂの表面粗さは０．２−Ｓになっている。
前記軸孔１ａに軸（不図示）を圧入して完成品となる。As shown in FIG. 2, the guide roller (molded product) 1 of the present invention is used for guiding a magnetic tape in an 8 mm video projector or the like integrally molded of resin by injection molding. Then, it has a shaft hole 1a in the axial direction, and the surface roughness of the outer peripheral surface 1b is 0.2-S.
A shaft (not shown) is press-fitted into the shaft hole 1a to complete the product.

【００１５】次に、本発明の、ガイドローラーの射出成
形方法について説明する。図３（ａ）に示すように、図
示しない射出成形機から、溶融樹脂１３を射出して、ス
プルー３、ランナー４およびゲート５を介して、低圧
（例えば１ｔｏｎ程度）にて型締めした金型のキャビテ
ィＡ内に、溶融樹脂を充填する。溶融樹脂の種類として
は、ＰＣ，ＰＯＭ，ＰＭＭＡ等の熱可塑性樹脂が挙げら
れる。Next, the injection molding method of the guide roller of the present invention will be described. As shown in FIG. 3 (a), a mold in which a molten resin 13 is injected from an injection molding machine (not shown) and clamped at low pressure (for example, about 1 ton) through the sprue 3, runner 4 and gate 5. The molten resin is filled in the cavity A of the above. Examples of the type of molten resin include thermoplastic resins such as PC, POM, and PMMA.

【００１６】この後、図３（ｂ）に示すように、キャビ
ティピン１２をコア９に当接するまで下降させ、また、
高圧（例えば４０００ｋｇ／ｃｍ2程度）にてキャビテ
ィスリーブ８をゲート５を通過するまで下降させると、
キャビティスリーブ８が一点鎖線８ａで示すように下降
する際に、キャビティＡ内の溶融樹脂が圧縮されて矢印
で示すようにゲート５側へ逆流し、成形品１の外周面と
ゲート５とが切り離される（図３の（ｃ）参照）。これ
により、キャビティＡ内の樹脂量が定量になるととも
に、成形品１の外周面１ｂ（図２参照）にゲート跡が付
かない。ここで、キャビティスリーブ８と固定側型板７
とのオーバーラップ量Ｒは、５０μｍ程度に設定されて
いる。After this, as shown in FIG. 3B, the cavity pin 12 is lowered until it abuts on the core 9, and
When the cavity sleeve 8 is lowered at a high pressure (for example, about 4000 kg / cm 2 ) until it passes through the gate 5,
When the cavity sleeve 8 descends as shown by the alternate long and short dash line 8a, the molten resin in the cavity A is compressed and flows back to the gate 5 side as shown by the arrow, and the outer peripheral surface of the molded product 1 and the gate 5 are separated. (See (c) of FIG. 3). As a result, the amount of resin in the cavity A becomes quantitative and the outer peripheral surface 1b (see FIG. 2) of the molded product 1 does not have a gate mark. Here, the cavity sleeve 8 and the fixed-side template 7
The overlap amount R with is set to about 50 μm.

【００１７】冷却後、金型を型開きして、キャビティス
リーブ８およびキャビティピン１２を上昇させ、また、
突き出しピン１０ａ，１０ｂにより成形品１を突き出
し、図２に示したガイドローラ１が得られる。上述の工
程を繰り返すことにより、多数の成形品を効率的に成形
する。After cooling, the mold is opened to raise the cavity sleeve 8 and the cavity pin 12, and
The molded product 1 is ejected by the ejection pins 10a and 10b, and the guide roller 1 shown in FIG. 2 is obtained. By repeating the above steps, a large number of molded products can be efficiently molded.

【００１８】上述のとおり本実施例では、可動側型板７
の成形品外周形成面１１の表面荒さが０．２−Ｓになっ
ているので、これが成形品１の外周面１ｂに転写され、
その表面粗さは０．２−Ｓになる。また、外周面１ｂに
はゲート跡がないので、機械研磨を行うことなく、成形
品１をそのまま使用できて、テープに傷が付かないとと
もに、生産性も向上する。さらに、低圧および高圧の２
段階の型締めを行うので、溶解樹脂の体積収が起こって
も、キャビティ内の樹脂量が定量になるので、多数の成
形品において成形品の重量および形状が均一になる上
に、１つの成形品内においても密度が均一になり、結果
的に、反りがなくかつ内径と外径の同心度のよい高品質
のガイドローラーを提供できる。As described above, in this embodiment, the movable side mold plate 7
Since the surface roughness of the molded product outer peripheral surface 11 is 0.2-S, this is transferred to the outer peripheral surface 1b of the molded product 1,
Its surface roughness is 0.2-S. Further, since there is no gate mark on the outer peripheral surface 1b, the molded product 1 can be used as it is without mechanical polishing, the tape is not scratched, and the productivity is improved. In addition, low and high pressure 2
Since the mold is clamped in stages, the amount of resin in the cavity can be quantified even if the volume of the dissolved resin is collected. The density is uniform even in the product, and as a result, it is possible to provide a high-quality guide roller having no warp and good concentricity between the inner diameter and the outer diameter.

【００１９】[0019]

【発明の効果】本発明は、以上説明したとおりに構成さ
れているので、以下に記載するような効果を奏する。請
求項１に記載の発明は、成形品（ガイドローラー）の外
周面を機械研磨によらず、所定の表面粗さにすることが
でき、８ミリビデオ映写機等のガイドローラーとして用
いたときに、テープに傷が付かない。請求項２および請
求項３に記載の発明は、多数の成形品において成形品の
重量および形状が均一になる上に、１つの成形品内にお
いても密度が均一になり、結果的に、反りがなくかつ内
径と外径の同心度のよい高品質のガイドローラーを効率
よく生産できる。Since the present invention is configured as described above, it has the following effects. According to the invention described in claim 1, the outer peripheral surface of the molded product (guide roller) can have a predetermined surface roughness without mechanical polishing, and when used as a guide roller of an 8 mm video projector, The tape is not scratched. The invention described in claim 2 and claim 3 makes the weight and shape of the molded product uniform in a large number of molded products, and also makes the density uniform in one molded product, resulting in warpage. It is possible to efficiently produce a high-quality guide roller that does not have a concentricity between the inner diameter and the outer diameter.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明のガイドローラーの射出成形方法の実施
に使用する金型の要部断面図である。FIG. 1 is a sectional view of a main part of a mold used for carrying out an injection molding method of a guide roller of the present invention.

【図２】本発明のガイドローラーの一実施例の縦断面図
である。FIG. 2 is a vertical sectional view of an embodiment of the guide roller of the present invention.

【図３】本発明のガイドローラーの射出成形方法の一実
施例を説明するための、図２に示した成形品を射出成形
する際の工程を示す図である。FIG. 3 is a diagram showing a process of injection molding the molded product shown in FIG. 2 for explaining an embodiment of the guide roller injection molding method of the present invention.

【符号の説明】[Explanation of symbols]

Ａ キャビティ Ｐ パーティング面 １ 成形品（ガイドローラー） １ａ 軸孔 １ｂ 外周面 ３ スプルー ４ ランナー ５ ゲート ６ 固定側型板 ７ 可動側型板 ８ キャビティスリーブ ９ コア １０ａ，１０ｂ 突き出しピン １１ 成形品外周形成面 １２ キャビティピン １３ 溶融樹脂 A Cavity P Parting surface 1 Molded product (guide roller) 1a Shaft hole 1b Outer peripheral surface 3 Sprue 4 Runner 5 Gate 6 Fixed side mold plate 7 Movable side mold plate 8 Cavity sleeve 9 Core 10a, 10b Extruded pin 11 Molded product outer circumference formation Surface 12 Cavity pin 13 Molten resin

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ１１Ｂ 23/087 ５１１ Ｇ１１Ｂ 23/087 ５１１Ｘ // Ｂ２９Ｌ 31:32 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location G11B 23/087 511 G11B 23/087 511X // B29L 31:32

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 射出成形により樹脂で一体成形されて外
周面の表面粗さが３．０−Ｓ以下になっていることを特
徴とするガイドローラー。1. A guide roller characterized by being integrally molded with resin by injection molding and having a surface roughness of 3.0-S or less on the outer peripheral surface. 【請求項２】 ガイドローラーを形成するためのキャビ
ティを有し、かつゲートがパーティング面上に位置する
ことを特徴とする、ガイドローラーを成形するための射
出成形金型。2. An injection mold for molding a guide roller, which has a cavity for forming a guide roller, and a gate is located on a parting surface. 【請求項３】 キャビティの周面の表面粗さが３．０−
Ｓ以下になっている請求項２に記載の金型を用い、 前記金型を低圧型締め力により型締めする工程と、 型締めした前記金型のキャビティ内に溶融樹脂を射出し
て充填する工程と、 射出後に、前記金型を高圧型締め力により型締めして、
成形品の外周面とゲートとを切り離す工程と、を有する
ことを特徴とする、ガイドローラーの射出成形方法。3. The surface roughness of the peripheral surface of the cavity is 3.0-
The mold according to claim 2, wherein the mold is less than S, a step of clamping the mold with a low-pressure mold clamping force, and a molten resin is injected and filled into the cavity of the mold that has been clamped. After the process and injection, the mold is clamped by the high pressure clamping force,
And a step of separating the outer peripheral surface of the molded product from the gate, the method of injection molding a guide roller.
JP7179245A 1995-07-14 1995-07-14 Guide roller, mold for injection molding for molding the guide roller and injection molding method Pending JPH0935373A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7179245A JPH0935373A (en) 1995-07-14 1995-07-14 Guide roller, mold for injection molding for molding the guide roller and injection molding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7179245A JPH0935373A (en) 1995-07-14 1995-07-14 Guide roller, mold for injection molding for molding the guide roller and injection molding method

Publications (1)

Publication Number Publication Date
JPH0935373A true JPH0935373A (en) 1997-02-07

Family

ID=16062479

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7179245A Pending JPH0935373A (en) 1995-07-14 1995-07-14 Guide roller, mold for injection molding for molding the guide roller and injection molding method

Country Status (1)

Country Link
JP (1) JPH0935373A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015131454A (en) * 2014-01-15 2015-07-23 オイレス工業株式会社 Gate-cutting device for injection molding device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015131454A (en) * 2014-01-15 2015-07-23 オイレス工業株式会社 Gate-cutting device for injection molding device

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