JP3794107B2 - Mold for molding resin-coated steel balls - Google Patents

Mold for molding resin-coated steel balls Download PDF

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Publication number
JP3794107B2
JP3794107B2 JP13584197A JP13584197A JP3794107B2 JP 3794107 B2 JP3794107 B2 JP 3794107B2 JP 13584197 A JP13584197 A JP 13584197A JP 13584197 A JP13584197 A JP 13584197A JP 3794107 B2 JP3794107 B2 JP 3794107B2
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Prior art keywords
steel ball
runner
gates
mold
molding
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Expired - Fee Related
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JP13584197A
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JPH10309735A (en
Inventor
秀人 大平
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Unimatec Co Ltd
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Unimatec Co Ltd
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    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C45/2708—Gates
    • 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
    • B29C45/14819—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 inserts being completely encapsulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material

Description

【０００１】
【発明の属する技術分野】
本発明は、鋼球の表面を弾性樹脂材による緩衝外殻で被覆した樹脂被覆鋼球の成形用金型に関するものである。
【０００２】
【従来の技術】
図２は、鋼球２の球面をウレタンゴム等の弾性樹脂材による緩衝外殻３で被覆したアイアンラバーボールと呼ばれる樹脂被覆鋼球１の断面図を示している。従来、この種の樹脂被覆鋼球１は、一般に図３に示されるような成形用金型４を用いて成形されている。
【０００３】
成形用金型４は、内部に球状のキャビティを有し、成形に際しては予めキャビティ内に芯材の鋼球２がセットされる。成形用金型４の内部には、鋼球２の球面を覆って緩衝外殻３を形成するために、溶融状態のウレタンゴムなどによる弾性樹脂材（溶融ゴム）８を流して供給する第１のランナー５と第２のランナー６が設けられている。第２のランナー６は、その内周の１８０°位相する対向位置の２個所に、溶融ゴム８を注入する２つのゲート７が設けられている。第１，第２のランナー５、６を流れて供給された溶融ゴム８は２つのゲート７から注入され、セットされている鋼球２の全表面を覆うようにして流動する。溶融ゴム８は硬化して緩衝外殻３を形成し、離型して図２のような樹脂被覆鋼球１が成形される。
【０００４】
ところで、このような従来例の成形用金型４の場合、キャビティにセットされた鋼球２の表面に対して、注入時の溶融ゴム８の流動が第２のライナー６における２つのゲート７に接近した近傍部分と、それらから離れた部分とで異なりが生じる。その結果、離型後の樹脂被覆鋼球１では、緩衝外殻３の肉厚が部分的に不均一となったものが成形されてしまい、内部芯材の鋼球２が遍在した製品となる不具合がある。
【０００５】
【発明が解決しようとする課題】
本発明の目的は、芯材となる鋼球の全表面をウレタンゴム等による緩衝外殻で覆った樹脂被覆鋼球を成形する際に、緩衝外殻の肉厚を鋼球表面に均一に成形できる成形用金型を提供することにある。
【０００６】
【課題を解決するための手段】
本発明に係る樹脂被覆鋼球の成形用金型は、キャビティ内にセットされた鋼球を囲む大きさの環状に形成されたランナーを有し、このランナーに設けた供給口から溶融状態の弾性樹脂材を供給してランナー内を流動させ、ランナーに設けたゲートから弾性樹脂材を鋼球の表面に沿って注入することにより、鋼球の表面を弾性樹脂材による緩衝外殻で被覆しているものであって、ランナーに６個のゲートを放射状に設け、供給口に最も近いゲートの注入断面積よりも供給口から離れた他のゲートの注入断面積を大きく形成している。
【０００７】
この場合、ランナーに設けた６個のゲートを、対向する２個ずつを一対として三対設けて、供給口に最も近い一対の２個のゲートの注入断面積に対して、供給口から順に離れた次の一対の２個の注入断面積を１．７〜１．９倍に形成し、その次の一対の２個の注入断面積を１．４〜１．６倍に形成しており、その一方でもこれらの範囲を外れると、成形不良（偏芯）が発生しやすくなる。また、６個のゲートをランナーの円周を６等分した位置に形成した場合、１．７〜１．９倍の注入断面積に形成されている次の一対の２個のゲートを、位相差１８０°の位置に対向して配置することができる。
【０００８】
【発明の実施の形態】
本発明による樹脂被覆鋼球の成形用金型の実施の形態について、図面を参照しながら詳細に説明する。
【０００９】
図１に示すように、本実施の形態の成形用金型１０は、下型や上型など複数の金型を型組みしたものからなり、型組みした内部に図２で示された樹脂被覆鋼球１を成形するための球状空洞であるキャビティが形成されている。このキャビティの内部には、成形に際して予め芯材となる鋼球２がセットされる。
【００１０】
成形用金型１０では、キャビティ内にセットされている鋼球２の表面を覆って緩衝外殻３を形成するために、ウレタンゴム等による溶融ゴム２０を流して供給する第１のランナー１１と第２のランナー１２が設けられている。
【００１１】
第１のランナー１１に連通する第２のランナー１２は、球状のキャビティに全円周方向から溶融ゴム２０を注入できるよう環状に設けられている。この環状の第２のランナー１２では、環状の内周に６個の溶融ゴム注入ゲートが等間隔で放射状に設けられている。いま、６個のゲートのうち、２個ずつを一対とする三対としてそれらをＸ，Ｘ、Ｙ，Ｙ、Ｚ，Ｚとする。ゲートＸの注入口断面積をＳとすると、ゲートＹの注入口断面積はそのゲートＸの断面積Ｓの１．７〜１．９倍としてある。また、ゲートＺの注入口断面積はゲートＸの断面積Ｓの１．４〜１．６倍になっている。即ち、第１のランナー１１に最も近いゲートＸの注入口断面積を１とした場合、それよりも離れたゲートＹの注入口断面積を大きくし、さらに離れたゲートＺの注入口断面積はゲートＹの注入口断面積よりも僅かに小さくしたゲートバランスとしてある。
【００１２】
以上のような成形用金型１０を用いた樹脂被覆鋼球１の成形は、型組みの段階で形成されるキャビティ内に鋼球２をセットし、その全表面に緩衝外殻３を形成させる材料である溶融ゴム２０の供給に備える。
【００１３】
第１のランナー１１に供給された溶融ゴム２０は第２のランナー１２に流入する。その際、溶融ゴム２０は第１のランナー１１の供給口１１ａから流動が分散され、まず最初に第２のランナー１２のゲートＸの２個を通してキャビティ内に注入される。続いて、溶融ゴム２０は２個のゲートＹと２個のゲートＺを通して順に注入される。このように、溶融ゴム２０が鋼球２の全表面に沿ってゲートＸ，Ｙ，Ｚよりなる６個の注入口から注入されるので、ゲート区間における流動は最小限に抑えられる。また、２個ずつゲート注入口断面積の大きさを変化させているので、キャビティに流入する溶融ゴム２０の注入量バランスがとれる。それによって、溶融ゴム２０の注入圧力で内部の鋼球２に動きが生じるのを抑えることができる。
【００１４】
溶融ゴム２０の注入圧力によって鋼球２の動きをバランスさせるということは、鋼球２の球面に形成される溶融ゴム２０の肉厚が均一になることを意味する。即ち、離型後に製品として得られる樹脂被覆鋼球１の品質は、内部の鋼球２が緩衝外殻３に対して遍在していないものが得られることを意味する。
【００１５】
本実施の形態の成形用金型１０を用いて成形された樹脂被覆鋼球１としては、内部の鋼球２の遍在量、換言すれば緩衝外殻３に対して鋼球２の偏芯量は０．５ｍｍ程度に抑えられ、従来例のそれの１．５ｍｍと比べて大幅に少なくすることができる。
【００１６】
【発明の効果】
本発明による樹脂被覆鋼球の成形用金型によれば、芯材となる鋼球の全表面に均一な厚さで緩衝外殻となるウレタンゴム等の弾性樹脂材で被覆した好品質のものが成形できる。
【図面の簡単な説明】
【図１】本発明に係る実施の形態の樹脂被覆鋼球を成形する金型を示す断面図である。
【図２】本実施の形態の成形用金型を用いて成形される樹脂被覆鋼球を示す断面図である。
【図３】従来例の樹脂被覆鋼球の成形用金型を示す断面図である。
【符号の説明】
１ 樹脂被覆鋼球
２ 内部芯材の鋼球
３ 緩衝外殻
１０ 成形用金型
１１ 第１のランナー
１１ａ 第１のランナーの供給口
１２ 第２のランナー
Ｘ，Ｙ，Ｚ 注入ゲート[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold for molding a resin-coated steel ball in which the surface of the steel ball is covered with a buffer outer shell made of an elastic resin material.
[0002]
[Prior art]
FIG. 2 shows a sectional view of a resin-coated steel ball 1 called an iron rubber ball in which the spherical surface of the steel ball 2 is covered with a buffer outer shell 3 made of an elastic resin material such as urethane rubber. Conventionally, this type of resin-coated steel ball 1 is generally molded using a molding die 4 as shown in FIG.
[0003]
The molding die 4 has a spherical cavity inside, and a steel ball 2 as a core material is set in the cavity in advance at the time of molding. In order to form the buffer outer shell 3 so as to cover the spherical surface of the steel ball 2, an elastic resin material (molten rubber) 8 such as molten urethane rubber is supplied and supplied to the inside of the molding die 4. Runner 5 and second runner 6 are provided. The second runner 6 is provided with two gates 7 for injecting the molten rubber 8 at two positions on the inner periphery facing each other at a phase of 180 °. Molten rubber 8 supplied through the first and second runners 5 and 6 is injected from the two gates 7 and flows so as to cover the entire surface of the set steel ball 2. The molten rubber 8 is cured to form the buffer outer shell 3, and the mold is released to form the resin-coated steel ball 1 as shown in FIG.
[0004]
By the way, in the case of such a conventional molding die 4, the flow of the molten rubber 8 at the time of injection is applied to the two gates 7 in the second liner 6 with respect to the surface of the steel ball 2 set in the cavity. There is a difference between the close vicinity and the distance from them. As a result, in the resin-coated steel ball 1 after the release, a product in which the thickness of the buffer outer shell 3 is partially non-uniform is formed, and the product in which the steel ball 2 of the inner core material is ubiquitous. There is a bug.
[0005]
[Problems to be solved by the invention]
The purpose of the present invention is to uniformly form the thickness of the buffer outer shell on the surface of the steel ball when molding a resin-coated steel ball in which the entire surface of the steel ball serving as the core is covered with a buffer outer shell made of urethane rubber or the like. The object is to provide a mold for molding.
[0006]
[Means for Solving the Problems]
The molding die for resin-coated steel balls according to the present invention has a runner formed in an annular shape with a size surrounding a steel ball set in a cavity, and is elastic in a molten state from a supply port provided in the runner. A resin material is supplied to flow in the runner, and the elastic resin material is injected along the surface of the steel ball from the gate provided on the runner, so that the surface of the steel ball is covered with a buffer outer shell made of the elastic resin material. The runner is provided with six gates radially, and the injection cross-sectional area of another gate far from the supply port is larger than the injection cross-sectional area of the gate closest to the supply port.
[0007]
In this case, the six gates provided on the runner are provided in pairs, two pairs each facing each other, and are sequentially separated from the supply port with respect to the injection cross-sectional area of the pair of two gates closest to the supply port. The next pair of two injection cross sections are formed 1.7 to 1.9 times, and the next pair of two injection cross sections are formed 1.4 to 1.6 times, On the other hand, if outside these ranges, molding defects (eccentricity) tend to occur. In addition, when six gates are formed at positions where the circumference of the runner is divided into six equal parts, the next pair of two gates formed in an injection cross-sectional area of 1.7 to 1.9 times are positioned It can be arranged opposite to the phase difference of 180 °.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a mold for molding resin-coated steel balls according to the present invention will be described in detail with reference to the drawings.
[0009]
As shown in FIG. 1, the molding die 10 of the present embodiment is formed by assembling a plurality of dies such as a lower die and an upper die, and the resin coating shown in FIG. A cavity that is a spherical cavity for forming the steel ball 1 is formed. Inside this cavity, a steel ball 2 which is a core material in the molding is set in advance.
[0010]
In the molding die 10, a first runner 11 for supplying a molten rubber 20 made of urethane rubber or the like to flow in order to cover the surface of the steel ball 2 set in the cavity and form the buffer outer shell 3; A second runner 12 is provided.
[0011]
The second runner 12 communicating with the first runner 11 is provided in an annular shape so that the molten rubber 20 can be injected into the spherical cavity from all circumferential directions. In the annular second runner 12, six molten rubber injection gates are provided radially at equal intervals on the annular inner periphery. Now, let it be assumed that X, X, Y, Y, Z, and Z are three pairs in which two of the six gates are paired. Assuming that the cross-sectional area of the inlet of the gate X is S, the cross-sectional area of the inlet of the gate Y is 1.7 to 1.9 times the cross-sectional area S of the gate X. Further, the cross-sectional area of the injection port of the gate Z is 1.4 to 1.6 times the cross-sectional area S of the gate X. That is, when the cross-sectional area of the gate X closest to the first runner 11 is set to 1, the cross-sectional area of the gate Y that is further away from the first runner 11 is increased, and the cross-sectional area of the gate Z that is further away is The gate balance is slightly smaller than the cross-sectional area of the injection port of the gate Y.
[0012]
Molding of the resin-coated steel ball 1 using the molding die 10 as described above is performed by setting the steel ball 2 in the cavity formed at the stage of mold assembly and forming the buffer outer shell 3 on the entire surface thereof. It prepares for supply of molten rubber 20 which is a material.
[0013]
The molten rubber 20 supplied to the first runner 11 flows into the second runner 12. At that time, the molten rubber 20 is dispersed from the supply port 11a of the first runner 11 and is first injected into the cavity through the two gates X of the second runner 12. Subsequently, the molten rubber 20 is sequentially injected through the two gates Y and the two gates Z. As described above, since the molten rubber 20 is injected from the six injection ports including the gates X, Y, and Z along the entire surface of the steel ball 2, the flow in the gate section is minimized. Moreover, since the size of the cross-sectional area of the gate injection port is changed by two, the injection amount balance of the molten rubber 20 flowing into the cavity can be balanced. Thereby, it is possible to suppress the movement of the internal steel ball 2 due to the injection pressure of the molten rubber 20.
[0014]
Balancing the movement of the steel ball 2 by the injection pressure of the molten rubber 20 means that the thickness of the molten rubber 20 formed on the spherical surface of the steel ball 2 becomes uniform. That is, the quality of the resin-coated steel ball 1 obtained as a product after mold release means that the inner steel ball 2 is not ubiquitous with respect to the buffer outer shell 3.
[0015]
As the resin-coated steel ball 1 molded using the molding die 10 of the present embodiment, the ubiquitous amount of the inner steel ball 2, in other words, the eccentricity of the steel ball 2 with respect to the buffer outer shell 3. The amount is suppressed to about 0.5 mm, and can be greatly reduced compared to the conventional example of 1.5 mm.
[0016]
【The invention's effect】
According to the molding die for resin-coated steel balls according to the present invention, the entire surface of the steel ball as the core material is coated with an elastic resin material such as urethane rubber having a uniform thickness as a buffer outer shell. Can be molded.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a mold for molding a resin-coated steel ball according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a resin-coated steel ball molded using the molding die of the present embodiment.
FIG. 3 is a cross-sectional view showing a conventional mold for molding resin-coated steel balls.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Resin coated steel ball 2 Steel ball of inner core material 3 Buffer outer shell 10 Mold for molding 11 First runner 11a First runner supply port 12 Second runner X, Y, Z Injection gate

Claims (2)

キャビティ内にセットされた鋼球を囲む大きさの環状に形成されたランナーを有し、このランナーに設けた供給口から溶融状態の弾性樹脂材を供給してランナー内を流動させ、ランナーに設けたゲートから弾性樹脂材を鋼球の表面に沿って注入することにより、鋼球の表面を弾性樹脂材による緩衝外殻で被覆してなる樹脂被覆鋼球の成形用金型において、
ランナーに６個のゲートを供給口から近い順に２個のゲートが対をなすようにして放射状に設け、供給口に最も近い一対の２個のゲートの注入断面積に対して、供給口から順に離れた次の一対の２個のゲートの注入断面積を１．７〜１．９倍に形成し、その次の一対の２個のゲートの注入断面積を１．４〜１．６倍に形成したことを特徴とする樹脂被覆球体の成型用金型。It has a runner formed in an annulus of a size surrounding a steel ball set in the cavity, and a molten elastic resin material is supplied from a supply port provided in this runner to cause the inside of the runner to flow. In a mold for molding a resin-coated steel ball formed by injecting an elastic resin material from the gate along the surface of the steel ball by covering the surface of the steel ball with a buffer outer shell made of an elastic resin material,
Six runners are provided in the runner in a radial pattern so that two gates are paired in order from the supply port , and the injection cross-sectional area of the pair of two gates closest to the supply port is in order from the supply port. The injection cross-sectional area of the next pair of two gates separated by 1.7 to 1.9 times is formed, and the injection cross-sectional area of the next pair of two gates is increased by 1.4 to 1.6 times. A mold for molding a resin-coated sphere characterized by being formed. ６個のゲートがランナーの円周を６等分した位置に形成されている請求項１記載の樹脂被覆鋼球の成形用金型。The mold for molding a resin-coated steel ball according to claim 1, wherein six gates are formed at a position obtained by dividing the circumference of the runner into six equal parts.
JP13584197A 1997-05-09 1997-05-09 Mold for molding resin-coated steel balls Expired - Fee Related JP3794107B2 (en)

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JP13584197A JP3794107B2 (en) 1997-05-09 1997-05-09 Mold for molding resin-coated steel balls

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JP13584197A JP3794107B2 (en) 1997-05-09 1997-05-09 Mold for molding resin-coated steel balls

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JP3794107B2 true JP3794107B2 (en) 2006-07-05

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KR100805337B1 (en) 2006-05-23 2008-02-22 평화산업주식회사 Cold runner block structure for manufacturing rubber products
JP5488234B2 (en) * 2010-06-15 2014-05-14 トヨタ自動車株式会社 Brake device, friction pair for brake device and brake pad

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Publication number Priority date Publication date Assignee Title
CN102267219A (en) * 2011-08-04 2011-12-07 苏州腾行精密模具有限公司 Injection mold with X-shaped runner

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