JPH0338098B2 - - Google Patents
Info
- Publication number
- JPH0338098B2 JPH0338098B2 JP61040538A JP4053886A JPH0338098B2 JP H0338098 B2 JPH0338098 B2 JP H0338098B2 JP 61040538 A JP61040538 A JP 61040538A JP 4053886 A JP4053886 A JP 4053886A JP H0338098 B2 JPH0338098 B2 JP H0338098B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- movable
- fixed
- punch
- stamper
- 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 - Lifetime
Links
- 238000003825 pressing Methods 0.000 claims description 13
- 238000004080 punching Methods 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000001746 injection moulding Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 description 19
- 239000007924 injection Substances 0.000 description 19
- 230000002093 peripheral effect Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 238000003780 insertion Methods 0.000 description 8
- 230000037431 insertion Effects 0.000 description 8
- 238000000465 moulding Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- 208000035193 Ring chromosome 10 syndrome Diseases 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は射出成形機に係り、特に、中心に開口
部を有するレコード盤、磁気デイスク、光学デイ
スク、あるいは情報記録デイスク等のデイスクの
成形に使用される射出成形装置に関する。Detailed Description of the Invention (Industrial Application Field) The present invention relates to an injection molding machine, and is particularly suitable for molding disks such as record discs, magnetic disks, optical disks, and information recording disks having an opening in the center. Regarding the injection molding equipment used.
(従来の技術)
レコード盤、ビデオデイスク等のデイスクを射
出によつて成形する発明に関しては、米国特許第
4085178号、第3989436号、第4260360号および本
願の出願人が先に出願した特開昭58−69028号公
報、特開昭59−230731号公報がある。これらに
は、射出後、デイスクの中心部を開口させる手段
が開示されている。(Prior art) Regarding the invention of molding discs such as record discs and video discs by injection, US Patent No.
There are No. 4085178, No. 3989436, No. 4260360, and JP-A-58-69028 and JP-A-59-230731, which were previously filed by the applicant of the present application. These disclose means for opening the center of the disk after injection.
ところで、中心部が開口したデイスク、特に光
学デイスクでは、鮮明な画像または良質の音が再
生されるための条件として、複屈折率が低いこと
およびデイスクの外周部と内周部との間に複屈折
率の差がないこと、つまり複屈折率の一様化が要
求される。 By the way, for disks with an open center, especially optical disks, the conditions for reproducing clear images or high-quality sound are that the birefringence is low and that there is a complex structure between the outer and inner peripheries of the disk. It is required that there be no difference in refractive index, that is, that the birefringence be uniform.
かかる要求を満足させるための1つの条件とし
て、溶融樹脂が金型キヤビテイに充填される際、
金型キヤビテイ内の空気が溶融樹脂によつて金型
キヤビテイ外に排出されることが必要であるが、
このためには、型締め時、金型キヤビテイは外部
と連通状態になくてはならない。 As one condition for satisfying such requirements, when filling the mold cavity with molten resin,
It is necessary for the air inside the mold cavity to be exhausted outside the mold cavity by the molten resin.
For this purpose, the mold cavity must be in communication with the outside during mold clamping.
また他の条件として、成形円盤の中央部をポン
チによつて開口させる際、成形円盤に撓みが生じ
ないことが要求される。この点が問題となるの
は、金型を閉じた状態で成形円盤の中央部を開口
させることが行われているからである。 Another condition is that the forming disk is not bent when the center portion of the forming disk is opened with a punch. This problem is caused by the fact that the center of the molding disk is opened while the mold is closed.
(発明が解決しようとする問題点)
しかし、前掲の米国特許および公開公報に記載
の装置にあつては、型締め時、スタンパを金型に
固定するスタンパ押え同士が密着している。その
ため射出時、金型キヤビテイから空気を抜くため
の構成が複雑とならざるを得なかつた。(Problems to be Solved by the Invention) However, in the devices described in the above-mentioned US patents and published publications, the stamper holders that fix the stamper to the mold are in close contact with each other during mold clamping. Therefore, during injection, the structure for removing air from the mold cavity had to be complicated.
また、従来では金型を閉じた状態で成形円盤の
中央部を開口させるために、ポンチの前進ととも
にスプルブツシユを後退させるようにしている
が、このスプルブツシユの後退は、ポンチの前進
に対してなんの抵抗も生じさせることなく行われ
るため、成形円盤の開口部の切口が粗くしかも開
口時成形円盤の中央部が撓むため、残留応力が生
じ、その結果、開口部付近での信号の賦形範囲が
狭くなる、という問題があつた。 Furthermore, in the past, in order to open the center part of the molding disk with the mold closed, the sprue button was moved backward as the punch moved forward, but this retraction of the sprue button has no effect on the forward movement of the punch. Because this is done without creating any resistance, the cut of the opening of the forming disk is rough, and the center of the forming disk bends when it is opened, resulting in residual stress, which results in a distortion of the signal shaping range near the opening. There was a problem that the space became narrower.
また、スプルブツシユの後退時に、ポンチの押
圧力に抗する方向の抵抗力を加えるようにすれば
良いのであるが、例えば、成形円盤の中心打抜径
15mm(CDの場合)、成形時にこの部分にかかる樹
脂圧がおよそ300Kg/cm2とすると、これに抗する
力Fは次の式で計算され、
F=π×1.52/4×300=530Kg
よつて、概算530Kg以上の力が必要とされる。
中心打抜径35mmのLDの場合はさらに大きな力と
なる。そこで、スプルブツシユに圧縮コイルばね
を利用した場合、その挿入スペースを確保しなけ
ればならず装置が大型化されるおそれがあり、ま
た、ばねの反発力が開始時と終了時では変化する
ので一定の力での打抜きが困難であるという問題
が発生する。 Also, when the sprue bushing retreats, it is possible to apply a resistance force in the direction of resisting the pressing force of the punch.
15mm (in the case of CD), and the resin pressure applied to this part during molding is approximately 300Kg/cm 2 , the force F resisting this is calculated using the following formula: F = π x 1.5 2 /4 x 300 = 530Kg Therefore, a force of approximately 530 kg or more is required.
In the case of an LD with a center punching diameter of 35 mm, the force is even greater. Therefore, if a compression coil spring is used for the sprue bushing, a space for its insertion must be secured, which may increase the size of the device.Also, the repulsive force of the spring changes at the start and end, so it is constant. A problem arises in that punching by force is difficult.
本発明は、かかる問題点を解決するためになさ
れたもので、残留応力の発生を極力抑制しうるデ
イスクの射出成形装置を得ることを目的とする。 The present invention has been made to solve these problems, and an object of the present invention is to provide a disk injection molding apparatus that can suppress the generation of residual stress as much as possible.
(問題点を解決するための手段)
本発明は、射出成形機の機台に固定した固定盤
に固定側金型を設け、前記固定盤に対して往復動
する可動盤に可動側金型を固定し、該固定側およ
び可動側金型の対向面には、型締完了時に該固定
側金型と該可動側金型とが保芯され互いに密着す
る傾斜部と端面部とが形成され、
該可動側金型の鏡面にスタンパを保持する外周
スタンパ押えを設けると共に、前記固定側金型に
その内周が金型キヤビテイの外周を規定する外周
リングを設け、かつ、型締完了時に前記外周スタ
ンパ押えと前記外周リングとの間に間隙を形成さ
せ、該金型キヤビテイの中心部に連通する溶融樹
脂通路を備えたスプルブツシユを移動可能に前記
固定側金型内に挿嵌し、前記可動側金型内に該ス
プルブツシユに対応する位置に前記金型キヤビテ
イの中心部を貫通するように往復動可能なポンチ
を設け、
前記スプルブツシユの後端面に押当自在な、加
熱筒の先端部に取付けられたノズルと、該加熱筒
を前後進させるシリンダ装置と、該シリンダ装置
に接続されたポンチの前進時に前記ノズルのスプ
ルブツシユに対する押圧力を調節する制御弁が介
装された油圧回路とを設け、成形された金型キヤ
ビテイ内の円盤の中心部をポンチで打抜く際、該
スプルブツシユの後退時にポンチの押圧力に抗す
る方向の抵抗力を加えることを特徴とする。(Means for Solving the Problems) The present invention provides a fixed mold on a fixed plate fixed to the base of an injection molding machine, and a movable mold on a movable plate that reciprocates with respect to the fixed plate. The fixed side mold and the movable side mold are fixed, and the opposing surfaces of the fixed side mold and the movable side mold are formed with an inclined part and an end face part, which center the fixed side mold and the movable side mold and make them come into close contact with each other when mold clamping is completed, An outer stamper holder for holding the stamper is provided on the mirror surface of the movable mold, and an outer ring whose inner periphery defines the outer periphery of the mold cavity is provided on the stationary mold, and when the mold clamping is completed, the outer periphery is fixed. A sprue bushing having a gap formed between the stamper holder and the outer ring and a molten resin passage communicating with the center of the mold cavity is movably inserted into the stationary mold, and the sprue bush is movably inserted into the fixed mold. A reciprocating punch is provided in the mold at a position corresponding to the sprue bush so as to pass through the center of the mold cavity, and the punch is attached to the tip of the heating cylinder that can be freely pressed against the rear end surface of the sprue bush. a cylinder device that moves the heating cylinder back and forth, and a hydraulic circuit equipped with a control valve that adjusts the pressing force of the nozzle against the sprue bushing when the punch connected to the cylinder device moves forward. When punching out the center of the disk in the mold cavity, a resistance force is applied in a direction that resists the pressing force of the punch when the sprue bushing retreats.
(作 用)
型締めに際して、可動盤を固定盤に接近させる
と、固定側金型および可動側金型は相互に接近
し、あるストロークに達すると、固定側および可
動側金型の端面部は密着し型締め力が該固定側お
よび可動側金型の端面部によつて支持される。(Function) When the movable platen approaches the fixed platen during mold clamping, the fixed side mold and the movable side mold approach each other, and when a certain stroke is reached, the end faces of the fixed side and movable side molds close together. The close contact and mold clamping force is supported by the end surfaces of the fixed and movable molds.
このようにして、型締めが完了すると、射出が
開始される。溶融樹脂が、金型キヤビテイ内に入
ると、金型キヤビテイ内の空気は、金型キヤビテ
イの外周部方向に移動し金型キヤビテイの外部に
漏出する。 In this way, when the mold clamping is completed, injection is started. When the molten resin enters the mold cavity, the air within the mold cavity moves toward the outer periphery of the mold cavity and leaks out of the mold cavity.
また、成形円盤の中央部を開口させるためにポ
ンチを前進させると、これに応じてスプルブツシ
ユは後退するが、後退に際しては、スプルブツシ
ユおよびノズルが油圧回路に連係するので、スプ
ルブツシユは制御弁により所定の抵抗力を有する
ことによつてポンチの押圧力に抗しながら後退す
ることになる。 Furthermore, when the punch is moved forward to open the center of the forming disk, the sprue button moves backward in response. During the retreat, the sprue button and nozzle are connected to the hydraulic circuit, so the sprue button is moved to a predetermined position by the control valve. By having a resistive force, it is possible to retreat while resisting the pressing force of the punch.
(実施例)
以下本発明の実施例を、図面を参照しながら説
明する。第1図は、型締め状態にある射出成形装
置の断面図を示すもので、1は固定盤、2は可動
盤であつて、固定盤1には、複数の要素から構成
される固定側組立体が取付けられ、可動盤2に
は、複数の要素から構成される可動側組立体が
取付けられている。(Example) Examples of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross-sectional view of an injection molding apparatus in a mold-clamping state, in which 1 is a fixed plate, 2 is a movable plate, and the fixed plate 1 has a fixed side assembly composed of a plurality of elements. A three-dimensional structure is attached to the movable platen 2, and a movable assembly composed of a plurality of elements is attached to the movable platen 2.
以下、固定側組立体および可動側組立体の
順に説明していくことにする。固定盤1の可動盤
2側の一端面には、段部3bが形成された内孔3
aを有する固定側取付部材3が固定され、該固定
側取付部材3の端面には、環状の固定側保持部材
4の端面が、ボルト5を介して取付けられてい
る。固定側取付部材3の内孔3aには、段部6a
が形成された固定側挿嵌部材6が巌挿され、その
一端面は固定盤1に当接するとともに他端部は内
孔3aから突出して固定側保持部材4の空孔4a
内に嵌合状態で延出しており、さらに固定側取付
部材3と固定側挿嵌部材6とは、段部3b,6a
同士が係合し、固定側挿嵌部材6の抜け止めが図
られている。固定側保持部材4の空孔4aには、
固定側鏡面板7が嵌合され、その一端面は、固定
側挿嵌部材6の端面に当接している。該固定側鏡
面板7の中央部は、可動盤2方向に突出する截頭
円錐状に形成されている。図示されていないが、
この截頭円錐部の端面には固定側スタンパを添設
することも可能で、この場合には固定側スタンパ
は、截頭円錐部の傾斜面沿いにボルト9を介して
取付けられた外周リング10によつて固定側鏡面
板7に固定される。該外周リング10の内周縁部
は、後述する環状スタンパ57と截頭円錐部の端
面との間隙の外周縁部に延出し、該間隙に充填さ
れて成形される成形品の外周面を画定するように
なつている。よつて、固定側保持部材4と固定側
鏡面板7とは固定側金型Xを構成する。 Hereinafter, the fixed side assembly and the movable side assembly will be explained in this order. An inner hole 3 in which a stepped portion 3b is formed is formed on one end surface of the fixed platen 1 on the movable platen 2 side.
A fixed-side mounting member 3 having a shape of 1.a is fixed, and an end face of an annular fixed-side holding member 4 is attached to the end face of the fixed-side mounting member 3 via a bolt 5. The inner hole 3a of the fixed side mounting member 3 has a stepped portion 6a.
A fixed-side insertion member 6 having a shape formed therein is inserted into the fixed side, one end surface of which contacts the fixed platen 1, and the other end protrudes from the inner hole 3a to fit into the hole 4a of the fixed-side holding member 4.
The fixed-side mounting member 3 and the fixed-side insertion member 6 extend in a fitted state, and the fixed-side fitting member 3 and the fixed-side insertion member 6 have stepped portions 3b and 6a.
They engage with each other to prevent the stationary side insertion member 6 from coming off. In the hole 4a of the fixed side holding member 4,
The fixed side mirror plate 7 is fitted, and one end surface thereof is in contact with the end surface of the fixed side insertion member 6. The central portion of the fixed side mirror plate 7 is formed into a truncated conical shape projecting in the direction of the movable platen 2. Although not shown,
It is also possible to attach a stationary side stamper to the end face of this truncated conical part, and in this case, the stationary side stamper is attached to the outer peripheral ring 10 attached via bolts 9 along the inclined surface of the truncated conical part. It is fixed to the fixed side mirror plate 7 by. The inner circumferential edge of the outer circumferential ring 10 extends to the outer circumferential edge of the gap between the annular stamper 57 and the end face of the truncated conical portion, which will be described later, and defines the outer circumferential surface of the molded product that is filled into the gap and molded. It's becoming like that. Therefore, the fixed side holding member 4 and the fixed side mirror plate 7 constitute the fixed side mold X.
固定側挿嵌部材6と固定側鏡面板7との中央部
には、これらを貫通する大径部と小径部とからな
る貫通孔11が形成されており、大径部は固定側
保持部材4に位置している。該貫通孔11には、
大径部と小径部とからなるスプルブツシユ12が
移動自在に嵌挿され、該大径部は貫通孔11の大
径部に、また小径部は貫通孔11の小径部にそれ
ぞれ位置している。貫通孔11の軸線方向におけ
る大径部の長さは、スプルブツシユ12の大径部
よりも長く、したがつてスプルブツシユ12は、
これらの長さの差の範囲内で移動しうることにな
る。そして、このスプルブツシユ12の前進は、
貫通孔11の大径部と小径部との境界の肩部13
によつて規制され、またスプルブツシユ12の後
退は、貫通孔11の後端部に取付けられたリング
14によつて規制される。 A through hole 11 consisting of a large diameter part and a small diameter part is formed in the center of the fixed side insertion member 6 and the fixed side mirror plate 7, and the large diameter part passes through the fixed side holding member 4. It is located in The through hole 11 has
A sprue bushing 12 consisting of a large diameter part and a small diameter part is movably inserted, and the large diameter part is located in the large diameter part of the through hole 11, and the small diameter part is located in the small diameter part of the through hole 11, respectively. The length of the large diameter portion of the through hole 11 in the axial direction is longer than the large diameter portion of the sprue bush 12.
It is possible to move within the range of these length differences. And the advancement of this spring bush 12 is,
Shoulder portion 13 at the boundary between the large diameter portion and the small diameter portion of the through hole 11
Further, the retraction of the sprue bush 12 is restricted by a ring 14 attached to the rear end of the through hole 11.
固定側挿嵌部材6の後端部には、透孔15を有
するロケートリング16が固定され、さらに固定
盤1には、該ロケートリング16よりも大径の貫
通孔17が形成されており、加熱筒18に取付け
られたノズル19は、該貫通孔17と透孔15と
を通つてスプルブツシユ12の後端面に形成され
た凹所12aに当接自在となつている。 A locate ring 16 having a through hole 15 is fixed to the rear end of the fixed side insertion member 6, and a through hole 17 having a larger diameter than the locate ring 16 is formed in the fixed platen 1. A nozzle 19 attached to the heating cylinder 18 can freely come into contact with a recess 12a formed in the rear end surface of the sprue bush 12 through the through hole 17 and the through hole 15.
図中、20は固定側鏡面板7に形成されたら旋
状の冷却溝、21は冷却溝20に連通した冷却水
の吸入孔である。なお、冷却水の排水孔は省略さ
れている。22は、固定側鏡面板7に位置する貫
通孔11の外周に嵌挿されたブツシユで、該ブツ
シユにスプルブツシユ12の先端部が移動自在に
嵌挿されている。 In the figure, 20 is a spiral cooling groove formed in the fixed side mirror plate 7, and 21 is a cooling water intake hole communicating with the cooling groove 20. Note that the cooling water drainage hole is omitted. Reference numeral 22 denotes a bush fitted into the outer periphery of the through hole 11 located in the fixed side mirror plate 7, and the tip of the sprue bush 12 is movably fitted into the bush.
つぎに、可動側組立体について説明すると、
可動盤2の固定盤1側における端面には、可動側
取付部材23、可動側第一部材24、環状の可動
側第二部材25、可動側第三部材26、中央部に
凹所27aを有する可動側第四部材27および環
状の可動側保持部材28が、これらの順序で取付
けられている。 Next, I will explain about the movable side assembly.
The end face of the movable platen 2 on the fixed platen 1 side has a movable mounting member 23, a movable first member 24, an annular movable second member 25, a movable third member 26, and a recess 27a in the center. The movable-side fourth member 27 and the annular movable-side holding member 28 are attached in this order.
29は可動盤2、可動側取付部材23および可
動側第一部材24を移動自在に貫通する突出しピ
ン、30は可動盤2を移動させる型締ラム31の
切欠部に往復動自在に取付けられた第一突出し
板、30aは可動側第二部材25の空孔25a内
に位置する第二突出し板であつて、突出しピン2
9の一端は第一突出し板30に固定され、また他
端は第二突出し板30aに固定されている。 29 is a projecting pin that movably penetrates the movable platen 2, the movable-side mounting member 23, and the movable-side first member 24; 30 is reciprocatably attached to a notch of a mold clamping ram 31 that moves the movable platen 2; The first protrusion plate 30a is a second protrusion plate located in the hole 25a of the movable second member 25, and the protrusion pin 2
One end of 9 is fixed to the first protrusion plate 30, and the other end is fixed to the second protrusion plate 30a.
可動側第一部材24にはシリンダ32が設けら
れ、該シリンダ32には先端面が後述するポンチ
50の基端部に当接したピストン33が摺動自在
に嵌挿され、該ピストン33の前進限度は、シリ
ンダ32の一端側の開口部に取付けられた規制板
34によつて決定され、後退限度は、可動側取付
部材23に固定されたシリンダ32の他端側用蓋
体35に固設されているストツパ36により決定
される。 The movable first member 24 is provided with a cylinder 32, into which a piston 33 whose distal end surface abuts the proximal end of a punch 50 (described later) is slidably inserted, and the piston 33 moves forward. The limit is determined by a regulation plate 34 attached to the opening at one end of the cylinder 32, and the retraction limit is determined by a regulation plate 34 attached to the opening on the other end of the cylinder 32, which is fixed to the movable attachment member 23. This is determined by the stopper 36 that is set.
可動側第三部材26の中央部には、凹所39が
形成され、該凹所39の底部には透孔40aが形
成されている。さらに、凹所39の外周側には、
一対のピン孔41が形成され、該ピン孔41に
は、円筒状のカラー42が摺動自在に嵌挿され、
該カラー42には、第二突出しピン43が摺動自
在に嵌挿されている。該カラー42および第二突
出しピン43の長さは、ピン孔41の長さよりも
長く、これらの一端部は第二突出し板30aに固
定され、また第二突出しピン43の他端部はピン
孔41から突出し、可動側第四部材27の凹所2
7aに摺動自在に嵌挿された駆動部材44の透孔
45に摺動自在に嵌挿されている。第二突出しピ
ン43の他端部における先端は大径にされ、該大
径部は透孔45の段部45aに当接自在になつて
いる。 A recess 39 is formed in the center of the movable third member 26, and a through hole 40a is formed at the bottom of the recess 39. Furthermore, on the outer peripheral side of the recess 39,
A pair of pin holes 41 are formed, and a cylindrical collar 42 is slidably inserted into the pin holes 41.
A second protruding pin 43 is slidably inserted into the collar 42 . The lengths of the collar 42 and the second protruding pin 43 are longer than the length of the pin hole 41, one end of which is fixed to the second protruding plate 30a, and the other end of the second protruding pin 43 is fixed to the pin hole 41. 41 and recess 2 of the movable fourth member 27
It is slidably inserted into the through hole 45 of the drive member 44 which is slidably inserted into the drive member 7a. The tip of the other end of the second ejecting pin 43 has a large diameter, and the large diameter portion can freely come into contact with the stepped portion 45a of the through hole 45.
環状の可動側保持部材28には、可動側挿嵌部
材46と可動側鏡面板47とが嵌挿され、可動側
挿嵌部材46の可動側第四部材27側には、凹所
46aが形成され、該凹所46aの底部には透孔
46bが形成され、さらに可動側鏡面板47にも
上記透孔46bとほぼ同径の透孔47aが形成さ
れている。該透孔46b,47aには、ブツシユ
48が挿入され、該ブツシユ48の端部は、凹所
46a内に位置するとともにその端面は可動側第
四部材27に固定されている。図中38は可動側
鏡面板47に形成されたら旋状の冷却溝である。
よつて、可動側保持部材28と可動側鏡面板47
とは可動側金型Yを構成する。 A movable side fitting member 46 and a movable side mirror plate 47 are fitted into the annular movable side holding member 28, and a recess 46a is formed on the movable side fourth member 27 side of the movable side fitting member 46. A through hole 46b is formed at the bottom of the recess 46a, and a through hole 47a having approximately the same diameter as the through hole 46b is also formed in the movable side mirror plate 47. A bush 48 is inserted into the through holes 46b and 47a, and the end of the bush 48 is located within the recess 46a, and the end surface thereof is fixed to the movable fourth member 27. In the figure, reference numeral 38 denotes a spiral cooling groove formed in the movable side mirror plate 47.
Therefore, the movable side holding member 28 and the movable side mirror plate 47
constitutes the movable mold Y.
上記駆動部材44の中央部と、凹所27aの底
部とのそれぞれには、透孔44a,27bが形成
されており、駆動部材44の透孔44aには、大
径部と小径部とからなる内孔を有する製品突出し
カラー49の一端が固定され、また凹所27aの
底部における透孔27bおよびブツシユ48には
該製品突出しカラー49の他端が摺動自在に嵌挿
されている。 Through holes 44a and 27b are formed in the center of the driving member 44 and the bottom of the recess 27a, respectively, and the through hole 44a of the driving member 44 has a large diameter part and a small diameter part. One end of a product protruding collar 49 having an inner hole is fixed, and the other end of the product protruding collar 49 is slidably inserted into the through hole 27b and the bush 48 at the bottom of the recess 27a.
そして、可動側第三部材26の透孔40a、駆
動部材44の透孔44a、製品突出しカラー49
の内孔は同心状に配置されてポンチ用孔を形成し
ており、該ポンチ用孔にはポンチ50が移動自在
に挿入されている。該ポンチ50は、大径部と、
小径部と、これらの中間の径の中間径部とからな
り、基端部から大径部、中間径部および小径部の
順で形成され、大径部は凹所39内に位置し、ま
た、小径部と中間径部とのテーパ状の段差部は、
製品突出しカラー49の内孔に形成されたテーパ
状の段差部に当接自在となつている。 The through hole 40a of the movable third member 26, the through hole 44a of the drive member 44, and the product protrusion collar 49
The inner holes are arranged concentrically to form a punch hole, into which a punch 50 is movably inserted. The punch 50 has a large diameter portion;
It consists of a small diameter part and an intermediate diameter part with a diameter between these, and is formed in the order of a large diameter part, an intermediate diameter part, and a small diameter part from the base end, and the large diameter part is located in the recess 39, and , the tapered stepped part between the small diameter part and the intermediate diameter part is
It can freely come into contact with a tapered stepped portion formed in the inner hole of the product protrusion collar 49.
ポンチ50には、また、その長手方向に伸長す
る貫通孔50aが形成され、該貫通孔50aに
は、一端が第二突出し板30aに固定された突出
しピン51が摺動自在に嵌挿されている。 The punch 50 is also formed with a through hole 50a extending in the longitudinal direction thereof, and a protruding pin 51 having one end fixed to the second protruding plate 30a is slidably inserted into the through hole 50a. There is.
ブツシユ48の先端部外周には、環状スタンパ
57の中央部を保持するための環状の内孔部スタ
ンパ押え52が往復動自在に設けられている。該
内孔部スタンパ52の先端部は外方に屈曲され、
スタンパ57の内周側に係合自在となつている。
さらに、該内孔部スタンパ押え52の基端部には
螺子部52aが形成され、該螺子部52aには、
傘ウオーム歯車53が螺合されている。該歯車5
3は、円筒状で、その内周面は、ブツシユ48の
拡径された基端部に螺合され、上記螺子部52a
には、歯車53の底部に形成された透孔の内周面
における螺子部が螺合されている。さらに、該歯
車53の開口部側の端面にも螺子部が形成され、
該螺子部には、可動側保持部材28に回転自在に
保持された螺杆54が螺合されており、螺杆54
を回転させると、歯車53が回転し、この歯車5
3の回転によつて内孔部スタンパ押え52が進退
動する。 On the outer periphery of the tip of the bush 48, an annular inner hole stamper holder 52 for holding the center portion of the annular stamper 57 is provided so as to be reciprocally movable. The tip of the inner hole stamper 52 is bent outward,
It can be freely engaged with the inner peripheral side of the stamper 57.
Further, a threaded portion 52a is formed at the base end of the inner hole stamper holder 52, and the threaded portion 52a includes:
An umbrella worm gear 53 is screwed together. The gear 5
3 has a cylindrical shape, and its inner circumferential surface is screwed into the enlarged diameter base end of the bush 48, and the threaded portion 52a
A threaded portion on the inner circumferential surface of a through hole formed at the bottom of the gear 53 is screwed into the gear 53 . Further, a threaded portion is also formed on the end surface of the gear 53 on the opening side,
A screw rod 54 rotatably held by the movable side holding member 28 is screwed into the screw portion.
When the gear 53 rotates, the gear 53 rotates.
3, the inner hole stamper holder 52 moves forward and backward.
55は、ポンチ50の大径部と可動側第三部材
26の底部との間に配設されたばねであつて、ポ
ンチ50を図面において右方向に弾発付勢するも
のである。56は、第二突出し板30aと環状第
四部材27との間に配設されたばねであつて、第
二突出し板30aを右方向に弾発付勢するための
ものである。 Reference numeral 55 denotes a spring disposed between the large diameter portion of the punch 50 and the bottom of the movable third member 26, which elastically biases the punch 50 in the right direction in the drawing. Reference numeral 56 denotes a spring disposed between the second protrusion plate 30a and the fourth annular member 27, and serves to elastically bias the second protrusion plate 30a in the right direction.
上記環状鏡面板47の底面には、中央部に開口
部を有する環状スタンパ57が取付けられる。可
動側鏡面板47の外周側には、環状スタンパ57
の外周部を可動側鏡面板47に固定する外周スタ
ンパ押え58がボルト59によつて取付けられて
いる。 An annular stamper 57 having an opening in the center is attached to the bottom surface of the annular mirror plate 47. An annular stamper 57 is provided on the outer peripheral side of the movable mirror plate 47.
An outer peripheral stamper holder 58 is attached with bolts 59 to fix the outer peripheral part of the stamper to the movable mirror plate 47.
外周スタンパ押え58は、第2図に示すよう
に、可動側鏡面板47の外周縁部に配置される環
状部材からなり、固定側鏡面板7と相対向する端
面は、可動側鏡面板47の径方向に対して平行状
に形成された外周平坦部58aと、該外周平坦部
58aに連らなり、環状スタンパ57方向に傾斜
した傾斜部58bと、該傾斜部58bに連らなり
外周平坦部58aと平行状の内周平坦部58cと
から形成されている。 As shown in FIG. 2, the outer peripheral stamper holder 58 is made of an annular member disposed on the outer peripheral edge of the movable mirror plate 47, and the end face facing the fixed mirror plate 7 is attached to the movable mirror plate 47. An outer peripheral flat part 58a formed parallel to the radial direction, an inclined part 58b connected to the outer peripheral flat part 58a and inclined in the direction of the annular stamper 57, and an outer peripheral flat part connected to the inclined part 58b. 58a and a parallel inner peripheral flat portion 58c.
該外周スタンパ押え58と相対向する固定側鏡
面板7の外周部は外周スタンパ押え58の平坦部
58aに対して平行状の外周平坦部10aと、該
平坦部10aに連らなり外周スタンパ押え58の
傾斜部58bに対して平行状の傾斜部10bと、
該傾斜部10bに連らなりスタンパ57と平行状
になつた内周平坦部10cとから形成され、相対
向する一対の平坦部10a,58aおよび傾斜部
10b,58b間と、内周平坦部10cおよびス
タンパ57間とには、型締め時、空気抜き用間隙
Gが形成される。ここでより具体的は数値につい
て述べると、内周平坦部10cとスタンパ57と
の間隙Gは約10μmに設定され、また内周平坦部
10cの径方向における長さは約3mmに設定され
る。これらの数値は、充填時における溶融樹脂の
間隙Gからの流出阻止という観点と、充填時にお
ける空気の流出をよくするという観点とに立脚し
て定められたものである。 The outer periphery of the fixed mirror plate 7 that faces the outer stamper holder 58 has an outer periphery flat part 10a that is parallel to the flat part 58a of the outer periphery stamper holder 58, and is connected to the flat part 10a to form the outer periphery stamper holder 58. an inclined portion 10b parallel to the inclined portion 58b;
The inner peripheral flat part 10c is formed from a pair of opposing flat parts 10a, 58a and the inclined parts 10b, 58b, and is formed from an inner peripheral flat part 10c that is connected to the inclined part 10b and parallel to the stamper 57. An air venting gap G is formed between the stamper 57 and the stamper 57 when the mold is clamped. More specifically, in terms of numerical values, the gap G between the inner circumferential flat part 10c and the stamper 57 is set to about 10 μm, and the length of the inner circumferential flat part 10c in the radial direction is set to about 3 mm. These numerical values were determined based on the viewpoints of preventing the molten resin from flowing out from the gap G during filling and improving the outflow of air during filling.
上記固定側保持部材4と可動側保持部材28と
は、型締め時、外周リング10と外周スタンパ押
え58とに空気抜き用間隙が形成されるよう互い
に当接する。いいかえれば型締め時における型締
め力は、環状および固定側保持部材28,4によ
つて支えられることになる。 The fixed side holding member 4 and the movable side holding member 28 abut each other so that an air venting gap is formed between the outer ring 10 and the outer stamper holder 58 during mold clamping. In other words, the mold clamping force during mold clamping is supported by the annular and stationary side holding members 28 and 4.
ところで、このように環状および固定側保持部
材28,4で型締め力を支持する場合、型締め
時、これらの部材28,4の相対向する端面は、
固定側および可動側鏡面板7,47が同心を保つ
よう正確に当接する必要がある。つまり、これら
の部材28,4は当接時、互いにずれないことが
必要である。このため、固定側鏡面板7と可動側
鏡面板47との相対向するそれぞれの端面には、
傾斜部が形成されている。 By the way, when the mold clamping force is supported by the annular and fixed-side holding members 28 and 4 in this way, when the mold is clamped, the opposing end surfaces of these members 28 and 4 are
It is necessary that the fixed side and movable side mirror plates 7 and 47 abut each other accurately so as to maintain concentricity. In other words, it is necessary that these members 28 and 4 do not shift from each other when they come into contact. For this reason, on each opposing end surface of the fixed side mirror plate 7 and the movable side mirror plate 47,
A sloped portion is formed.
すなわち、固定側保持部材4の端面における上
下の両側端部は、可動側保持部材28の移動方向
に対して直交する平坦部4a,4bに形成され、
該平坦部4a,4b間には、可動側保持部材28
から遠ざかる方向に傾斜する傾斜部4cが形成さ
れている。 That is, both upper and lower end portions of the end surface of the fixed side holding member 4 are formed into flat portions 4a and 4b perpendicular to the moving direction of the movable side holding member 28,
A movable side holding member 28 is provided between the flat parts 4a and 4b.
A sloped portion 4c is formed that slopes in a direction away from the surface.
可動側保持部材28の端面における上下の両側
端部にも平坦部28a,28bが形成され、また
該平坦部28a,28b間には傾斜部28cが形
成されている。そして該平坦部28a,28bお
よび傾斜部28cは、固定側保持部材4の対応す
る平坦部4a,4bおよび傾斜部4cに対して平
行になつている。ところで傾斜部4cの傾斜角度
であるが、これは可動側保持部材28の移動方向
に対して4゜〜10゜の範囲内、好ましくは7゜に設定さ
れる。固定側および可動側保持部材4,28の端
面は、上記のように形成されているので、型締め
時これら部材4,28は傾斜部4a,28c相互
の摺動によつて互いに案内されることになり、し
たがつて当接時これら部材4,28は相互にずれ
ることがない。なお、傾斜部7cの上記傾斜角度
は、あまりに大きいと案内の機能が減退すること
になり、また、あまりに小さいと傾斜部4a,2
8a同士が干渉し合うことになり、傾斜部4a,
28a同士の円滑な摺動が得られないことにな
る。上記傾斜角度の範囲は、これらの不都合が生
じない範囲である。 Flat portions 28a and 28b are also formed at both upper and lower end portions of the end surface of the movable side holding member 28, and an inclined portion 28c is formed between the flat portions 28a and 28b. The flat parts 28a, 28b and the inclined part 28c are parallel to the corresponding flat parts 4a, 4b and the inclined part 4c of the fixed side holding member 4. Incidentally, the inclination angle of the inclined portion 4c is set within a range of 4° to 10°, preferably 7° with respect to the moving direction of the movable side holding member 28. Since the end faces of the fixed side and movable side holding members 4, 28 are formed as described above, when the mold is clamped, these members 4, 28 are guided to each other by mutual sliding of the inclined parts 4a, 28c. Therefore, these members 4 and 28 do not shift from each other when they come into contact. Note that if the above-mentioned inclination angle of the inclination part 7c is too large, the guiding function will be reduced, and if it is too small, the inclination angle of the inclination parts 4a, 2
8a will interfere with each other, and the inclined parts 4a,
This means that smooth sliding between the parts 28a cannot be achieved. The range of the above-mentioned inclination angle is a range in which these inconveniences do not occur.
つぎに固定側組立体について説明する際に述
べたスプルブツシユ12に関してその動作を述べ
ると、本発明では環状キヤビテイのパーテイング
面を密着させたままポンチ50によつて成形品の
中央部を開口させるため、スプルブツシユ12は
可動式になつており、ポンチ50の前進とともに
スプルブツシユ12は後退する。しかし、本発明
ではただ単になんの抵抗も生じさせることなくス
プルブツシユ12を後退させるのではなく、ポン
チ50を前進させつつ該ポンチ50の押圧力に抗
する力をかけながら後退させる。すなわち、通常
は溶融樹脂の射出完了後、即座にノズル19を後
退させるのであるが、本発明では、射出完了後、
ノズル19を後退させることなくスプルブツシユ
12の凹所12aに接触させたままにし、接触力
を小さくする。このノズル19の接触によつてス
プルブツシユ12に押圧力を付与するのである。
この押圧力は一定でもよく、あるいは段階的また
はスロープ的に変化させてもよい。 Next, the operation of the sprue bush 12 mentioned when explaining the stationary side assembly will be described. In the present invention, the center part of the molded product is opened using the punch 50 while the parting surface of the annular cavity is kept in close contact with the sprue bush 12. The sprue bush 12 is movable, and as the punch 50 moves forward, the sprue bush 12 moves backward. However, in the present invention, the sprue bush 12 is not simply retracted without creating any resistance, but is retracted while advancing the punch 50 while applying a force that resists the pressing force of the punch 50. That is, normally, the nozzle 19 is retreated immediately after the injection of molten resin is completed, but in the present invention, after the injection is completed,
The nozzle 19 is kept in contact with the recess 12a of the sprue bush 12 without retreating, and the contact force is reduced. This contact of the nozzle 19 applies a pressing force to the sprue bush 12.
This pressing force may be constant or may be changed stepwise or slopewise.
ここで上記のようなノズル19の動作を行わせ
る具体的な機構について説明する。第1図に示す
ように、ノズル19は加熱筒18の先端部に取付
けられ、加熱筒18は、連結部60を介して油圧
シリンダ61のピストンロツド61aに連結され
ている。油圧シリンダ61の両端部には、油孔6
2,63が形成され、油圧シリンダ61の前進限
度側の油孔62には、管路65aが連結され、後
退限度側の油孔63には管路65bが連結され、
該管路65a,65bは4ポート3位置切換弁6
7が連結され、該切換弁67には油圧ポンプ64
と油タンク66とが連結されている。さらに油孔
63と4ポート3位置切換弁67との間の管路6
5bには、油タンク66に接続された分岐路68
が連結され、該分岐路68には、電磁比例圧力制
御弁69が介装されている。 Here, a specific mechanism for operating the nozzle 19 as described above will be explained. As shown in FIG. 1, the nozzle 19 is attached to the tip of the heating cylinder 18, and the heating cylinder 18 is connected to a piston rod 61a of a hydraulic cylinder 61 via a connecting part 60. Oil holes 6 are provided at both ends of the hydraulic cylinder 61.
2, 63 are formed, a pipe line 65a is connected to the oil hole 62 on the forward limit side of the hydraulic cylinder 61, a pipe line 65b is connected to the oil hole 63 on the backward limit side,
The pipe lines 65a and 65b are connected to a 4-port 3-position switching valve 6.
7 is connected to the switching valve 67, and a hydraulic pump 64 is connected to the switching valve 67.
and an oil tank 66 are connected. Furthermore, the pipe line 6 between the oil hole 63 and the 4-port 3-position switching valve 67
5b has a branch path 68 connected to the oil tank 66.
are connected to each other, and an electromagnetic proportional pressure control valve 69 is interposed in the branch passage 68 .
4ポート3位置切換弁67の位置は、ソレノイ
ド67a,67bを励磁することによつて決定さ
れる。たとえば、ソレノイド67aを励磁する
と、4ポート3位置切換弁67はA位置をとり、
ピストン61cの前進限度側に圧油が供給され、
後退限度側の油は排出されるため、ノズル19は
後退する。また、ソレノイド67bを励磁すると
4ポート3位置切換弁67はB位置をとり、ピス
トンロツド61aの後退限度側に圧油が供給され
るとともに前進限度側の油は排出され、この結果
ノズル19は前進する。 The position of the 4-port 3-position switching valve 67 is determined by energizing the solenoids 67a and 67b. For example, when the solenoid 67a is energized, the 4-port 3-position switching valve 67 takes the A position,
Pressure oil is supplied to the forward limit side of the piston 61c,
Since the oil on the retreat limit side is discharged, the nozzle 19 retreats. Furthermore, when the solenoid 67b is energized, the 4-port 3-position switching valve 67 takes the B position, and pressure oil is supplied to the backward limit side of the piston rod 61a, while the oil on the forward limit side is discharged, and as a result, the nozzle 19 moves forward. .
ところで上記油圧回路の分岐路68には、電磁
比例圧力制御弁69が設けられているので、該弁
69の設定圧力を適当に決めれば、上述したよう
に、スプルブツシユ12に与える力を調節するこ
とができる。 By the way, since an electromagnetic proportional pressure control valve 69 is provided in the branch path 68 of the hydraulic circuit, if the set pressure of the valve 69 is appropriately determined, the force applied to the sprue bush 12 can be adjusted as described above. Can be done.
上記ではスプルブツシユ12に与える力の調節
を電磁比例圧力制御弁69によつて行つている
が、これに限らず減圧弁を用いることも可能であ
り、さらにはスプルブツシユ12が後退する状態
にあるとき、スプルブツシユ12を支えている油
圧系の油圧を絞りを介して抜くことによつて、背
圧を生じさせて、スプルブツシユ12に抵抗力を
付与するようにしても良い。 In the above description, the force applied to the sprue bush 12 is adjusted by the electromagnetic proportional pressure control valve 69, but the invention is not limited to this, and a pressure reducing valve can also be used.Furthermore, when the sprue bush 12 is in the retracted state, A resistance force may be applied to the sprue bush 12 by generating back pressure by removing the hydraulic pressure of the hydraulic system supporting the sprue bush 12 through a throttle.
なお、70は図示しない型締シリンダに取付け
られた螺子杆であつて、型開き時、第一突出し板
30が当接自在となつている。 Note that 70 is a screw rod attached to a mold clamping cylinder (not shown), and the first protruding plate 30 can freely come into contact with it when the mold is opened.
また、第5図において、71は成形品取出し腕
であつて、成形円盤72を吸着する円盤吸着盤7
3と、成形円盤72の打ち抜かれた打抜き板74
を吸着する開口部吸着盤75とを備えている。該
成形品取出し腕71は、金型が開いたとき、金型
の上方から下降し、所定の位置に達したところで
停止し、成形円盤72とスプルが付着した打抜き
74とを吸着した後、再び上昇する。なお、76
は固定盤1に固定されかつ可動盤2を摺動自在に
貫通するステーである。 Further, in FIG. 5, reference numeral 71 denotes a molded product take-out arm, and a disk suction cup 7 that sucks a molded disk 72.
3, and a punched plate 74 punched out of the molded disk 72.
It is equipped with an opening suction cup 75 for suctioning. When the mold is opened, the molded product take-out arm 71 descends from above the mold, stops when it reaches a predetermined position, adsorbs the molding disk 72 and the punching 74 to which the sprue is attached, and then moves again. Rise. In addition, 76
is a stay fixed to the fixed platen 1 and slidably passing through the movable platen 2.
つぎに上記構成に係る装置の作用について述べ
る。図示しない端締シリンダを駆動して型締ラム
31を図面において左方に前進させると、可動側
保持部材28は固定側保持部材4に近接し、可動
側保持部材28の傾斜部28cが固定側保持部材
4の傾斜部4c沿いに摺動することになり、換言
すれば、可動側保持部材28は両傾斜部4c,2
8cに案内されつつ固定側保持部材4に接近し、
最後に可動側保持部材28の平坦部28a,28
bが固定側保持部材4の平坦部4a,4bに当接
することにより、可動側保持部材28の前進は停
止し、型締めが完了する。 Next, the operation of the device having the above configuration will be described. When the end clamping cylinder (not shown) is driven to advance the mold clamping ram 31 to the left in the drawing, the movable side holding member 28 comes close to the fixed side holding member 4, and the inclined part 28c of the movable side holding member 28 is on the fixed side. In other words, the movable holding member 28 slides along the inclined portions 4c of the holding member 4.
Approach the fixed side holding member 4 while being guided by 8c,
Finally, the flat parts 28a, 28 of the movable side holding member 28
When b comes into contact with the flat portions 4a, 4b of the fixed side holding member 4, the forward movement of the movable side holding member 28 is stopped, and mold clamping is completed.
この型締め完了の状態において、外周リング1
0と外周スタンパ押え58および外周リング10
と可動側スタンパ57とには、第2図に示すよう
に、空気抜き用間隙が形成されること前述のとお
りである。 In this state of mold clamping completion, the outer ring 1
0, the outer stamper holder 58 and the outer ring 10
As described above, an air vent gap is formed between the movable stamper 57 and the movable stamper 57, as shown in FIG.
このようにして固定側および可動側鏡面板7,
47が閉じたならば、図示しない型締シリンダ内
の圧力を予め定めた圧力にまで増圧させた後、前
述のようにして4ポート3位置切換弁67をB位
置にして加熱筒18を前進させ、ノズル19の先
端部をスプルブツシユ12の凹所12aに密着さ
せ、加熱筒18内の溶融樹脂を金型キヤビテイに
射出する。この状態を示すのが第1図である。 In this way, the fixed side and movable side mirror plates 7,
47 is closed, the pressure inside the mold clamping cylinder (not shown) is increased to a predetermined pressure, and then the 4-port 3-position switching valve 67 is set to the B position as described above, and the heating cylinder 18 is moved forward. Then, the tip of the nozzle 19 is brought into close contact with the recess 12a of the sprue bush 12, and the molten resin in the heating cylinder 18 is injected into the mold cavity. FIG. 1 shows this state.
本発明では、最初高速にて射出し、予め定めた
位置または時間に達したとき射出速度を低速に切
換える。この場合、スクリユの慣性によつて予め
定めた位置において予め定めた射出速度が得られ
ないことがある。このため、射出成形機の射出油
圧回路に背圧を設け、スクリユの慣性を抑える手
段を採用し、さらに射出完了後、保持圧力を段階
的に切換えたりまたは連続的に減圧する手段を採
用してもよい。 In the present invention, injection is performed at high speed initially, and when a predetermined position or time is reached, the injection speed is switched to low speed. In this case, a predetermined injection speed may not be obtained at a predetermined position due to the inertia of the screw. For this reason, we have adopted measures to suppress the inertia of the screw by providing back pressure in the injection hydraulic circuit of the injection molding machine, and also adopted measures to change the holding pressure in stages or to reduce the pressure continuously after injection is complete. Good too.
上記の如くして溶融樹脂の射出が完了したなら
ば、金型キヤビテイ内の溶融樹脂に適切な保持圧
力をかけて予め定めた時間だけ保持し、この後、
4ポート3位置切換弁67を中立位置に切換え
る。これと同時に可動側第一部材24に設けたシ
リンダ32が作動し、ピストン33が左方に移動
してポンチ50を左方に突き出す(第3図参照)。
該ポンチ50の動作により成形円盤の中心部は打
ち抜かれて開口するが、この際、スプルブツシユ
12は後退可能に設けられているので、ポンチ5
0の前進とともに後退を開始する。しかし、スプ
ルブツシユ12の凹所12aには、ノズル19が
当接したままであり、しかも4ポート3位置切換
弁67は中立位置にあるので、スプルブツシユ1
2の後退に伴つてノズル19も後退するとともに
ピストン61cも後退し、この結果油圧シリンダ
61内の油が油孔63から流出するが、この流出
する油は直接油タンク66に流入することなく、
電磁比例圧力制御弁69を通つて油タンク66に
流入するので、ノズル19の後退に際しては、抵
抗が生ずることになり、スプルブツシユ12には
ポンチ50の押圧力に抗する方向の抵抗力が付与
され、したがつてスプルブツシユ12はポンチ5
0の前進時ポンチに反力を与えることなく後退す
ることはない。この抵抗力は電磁比例圧力制御弁
69の設定値を変えることにより任意に調整でき
る。スプルブツシユ12にポンチ50の押圧力に
抗する力がかけられない場合には、ポンチ50の
前進時、スプルブツシユ12は何の抵抗もなく後
退することになるが、この場合には、成形円盤の
開口部における切口が粗くなるため、残留応力が
生じ、この結果、開口部付近における信号の賦形
範囲が狭められることになる。 Once the injection of the molten resin is completed as described above, an appropriate holding pressure is applied to the molten resin in the mold cavity to hold it for a predetermined time.
The 4-port 3-position switching valve 67 is switched to the neutral position. At the same time, the cylinder 32 provided on the movable first member 24 is actuated, and the piston 33 moves to the left to project the punch 50 to the left (see FIG. 3).
The center of the forming disk is punched out by the operation of the punch 50, and at this time, since the sprue bush 12 is provided so as to be retractable, the punch 5
0 starts moving forward and moving backward. However, since the nozzle 19 remains in contact with the recess 12a of the sprue bush 12 and the 4-port 3-position switching valve 67 is in the neutral position, the sprue bush 1
2, the nozzle 19 also retreats, and the piston 61c also retreats, and as a result, the oil in the hydraulic cylinder 61 flows out from the oil hole 63, but this flowing oil does not directly flow into the oil tank 66.
Since the oil flows into the oil tank 66 through the electromagnetic proportional pressure control valve 69, resistance occurs when the nozzle 19 retreats, and a resistance force is applied to the sprue bush 12 in the direction of resisting the pressing force of the punch 50. , therefore, the spur button 12 is the punch 5.
When 0 moves forward, it does not move backward without giving a reaction force to the punch. This resistance force can be arbitrarily adjusted by changing the set value of the electromagnetic proportional pressure control valve 69. If no force is applied to the sprue bush 12 to resist the pressing force of the punch 50, the sprue bush 12 will retreat without any resistance when the punch 50 moves forward. Since the cut at the opening becomes rough, residual stress is generated, and as a result, the signal shaping range near the opening is narrowed.
上記の如くして成形円盤の打ち抜きが終了する
と、可動盤2が後退を始め、これとともに、第一
突出し板30も後退するが、ある程度後退する
と、第一突出し板30は一対の螺子杆70に当接
して停止する。他方可動盤2は、第一突出し板3
0の停止後も後退を続けるため、突出しピン29
を介して第二突出し板30aに取付けられた突出
しピン51は相対的に突出し、第4図に示すよう
に、ポンチ50によつて打ち抜かれた打ち抜き板
74を突き出す。 When the punching of the molded disc is completed as described above, the movable plate 2 begins to retreat, and the first protruding plate 30 also retreats, but after retreating to a certain extent, the first protruding plate 30 engages the pair of screw rods 70. It stops when it comes into contact with it. The other movable platen 2 has a first protruding plate 3
In order to continue retracting even after stopping at 0, the ejecting pin 29
The protruding pin 51 attached to the second protruding plate 30a through the protruding pin 51 protrudes relatively, and as shown in FIG. 4, protrudes the punched plate 74 punched by the punch 50.
そして、さらに可動盤2が後退すると、相対的
にカラー42が突出し駆動部材44を左方に移動
させるため、製品突出しカラー49が突出し、第
5図に示すように、成形円盤を可動側金型47か
ら離型させる。 When the movable platen 2 further retreats, the collar 42 protrudes relatively to move the drive member 44 to the left, so the product ejecting collar 49 protrudes, and as shown in FIG. Release from the mold from 47.
ついで、成形品取出腕71が、同図に示すよう
に下降し成形円盤と打抜き板74とを、円盤吸着
盤73と開口部吸着盤75とが吸着する。この
後、成形品取出腕71は、左方に移動し、ついで
上昇することにより、成形円盤と打抜き板74と
を所定の位置に移動させる。 Next, the molded product removal arm 71 descends as shown in the figure, and the molded disk and punching plate 74 are sucked by the disk suction cup 73 and the opening suction cup 75. Thereafter, the molded product removal arm 71 moves to the left and then rises, thereby moving the molding disk and the punching plate 74 to a predetermined position.
第6図は上記の過程を図式化したもので、折れ
線Aに示すように、射出工程a、成形品を冷却す
る冷却工程b、圧抜工程c、低速型開工程d、高
速型開工程e、低速型開工程f、突出しピン29
前進工程gおよび突出しピン29後退工程hの順
で行なわれる。 Figure 6 is a diagram showing the above process, and as shown by the polygonal line A, the injection process a, the cooling process b for cooling the molded product, the pressure release process c, the low-speed mold opening process d, and the high-speed mold opening process e. , low speed mold opening process f, ejector pin 29
The advancing step g and the ejecting pin 29 retreating step h are performed in this order.
ノズル19のスプルブツシユ12に対する接触
力Pは、折れ線Bに示すように、射出完了までは
高圧に設定され、射出完了後は低圧に設定され
る。 The contact force P of the nozzle 19 with respect to the sprue bush 12 is set to a high pressure until the injection is completed, and is set to a low pressure after the injection is completed, as shown by the polygonal line B.
折れ線Cは、ポンチ50の動作を示すもので、
射出完了後、時間tが経過した後、前進する。こ
の時間tは、0.5秒である。このように本発明で
は、射出完了直後、まだ成形品が冷却によつて硬
化しない間にポンチ50による抜ち抜きが行われ
るので、成形品の開口部における切り口がなめら
かになるとともに切り粉が発生せず、したがつて
切り粉がスタンパ57の表面または固定側金型4
の底面に付着することがなく、このため次の新た
な射出において、切り粉の混入による成形不良が
生ずることがない。 A polygonal line C indicates the operation of the punch 50.
After the elapse of time t after completion of injection, the robot moves forward. This time t is 0.5 seconds. In this way, in the present invention, punching is performed with the punch 50 immediately after injection is completed, while the molded product is not yet hardened by cooling, so the cut at the opening of the molded product becomes smooth and chips are generated. Therefore, the chips may not be on the surface of the stamper 57 or the stationary mold 4.
Therefore, in the next new injection, molding defects due to contamination of chips will not occur.
ポンチ50は、突出しピン29が後退を始める
と同時に後退する。 The punch 50 retreats at the same time as the ejector pin 29 begins to retreat.
折れ線Dは、チヤージ工程を示し、樹脂供給工
程i、可塑化工程jおよびサツクバツクkの順で
行われる。折れ線Eは、ノズル19の動作を示
し、射出完了後、ポンチ50による打抜きが終了
するまでの時間tは、低圧によつて、換言すれば
ポンチの押圧力に抗する方向の力をかけられた状
態でスプルブツシユ12に接触しており、打抜き
完了後、後退し、リミツトスイツチLSNに当接
することによつて後退を停止する。 A polygonal line D indicates a charging process, which is performed in the order of resin supplying process i, plasticizing process j, and suction k. A polygonal line E indicates the operation of the nozzle 19, and during the time t from the completion of injection to the completion of punching by the punch 50, a force is applied due to low pressure, in other words, a force is applied in a direction that resists the pressing force of the punch. In this state, it is in contact with the sprue bush 12, and after punching is completed, it moves backward and stops moving back by coming into contact with the limit switch LSN.
同図から明らかなように、型開工程d,e,f
はポンチ50が前進した状態で行われるため、ポ
ンチ50は打抜き後、再度成形品の開口部を通過
することがなく、したがつて切り口が傷付けられ
ることも切り粉が発生することもない。また、加
熱筒を作動する油圧回路を利用してノズル19を
スプルブツシユ12に押当可能に設けているので
構成が簡単で抗力が得られるという利点がある。 As is clear from the figure, mold opening steps d, e, f
Since this is performed with the punch 50 advanced, the punch 50 does not pass through the opening of the molded product again after punching, so the cut end is not damaged and no chips are generated. Further, since the nozzle 19 is provided so as to be able to be pressed against the sprue bush 12 by using the hydraulic circuit that operates the heating cylinder, there is an advantage that the structure is simple and that a resistance can be obtained.
(発明の効果)
本発明は以上から明らかなように、型締力を固
定側および可動側金型の端部を密着させることに
よつて支持させることにより、金型キヤビテイに
空気抜き用間隙を形成することができ、したがつ
て構成を簡単にすることができる。(Effects of the Invention) As is clear from the above, the present invention forms an air vent gap in the mold cavity by supporting the mold clamping force by bringing the ends of the fixed and movable molds into close contact with each other. Therefore, the configuration can be simplified.
また、ポンチの前進時におけるスプルブツシユ
の後退時、該スプルブツシユにはポンチの押圧力
に抗する抵抗力が加えられるので、成形円盤の開
口部における切口はなめらかになり、さらに開口
部付近の撓みも抑制されるので、残留応力の発生
が極力抑制されることになる。また、制御弁を調
節することによつてスプルブツシユの抗力を任意
に変えることができ、最適の条件を選んでデイス
クの中心孔を打抜くことができ内部応力の発生を
抑え複屈折率が改善されるようになる。 In addition, when the sprue bush is retreating when the punch is moving forward, a resistance force is applied to the sprue bush that resists the pressing force of the punch, so the cut at the opening of the forming disk becomes smooth and bending near the opening is also suppressed. Therefore, the generation of residual stress is suppressed as much as possible. In addition, by adjusting the control valve, the drag force of the sprue bushing can be changed arbitrarily, and the center hole of the disk can be punched under the optimal conditions, suppressing the generation of internal stress and improving the birefringence. Become so.
第1図は本発明に係る装置の断面図、第2図は
本発明の要部を示す断面図、第3図はポンチの突
出状態を示す第1図相当図、第4図は型開き状態
を示す第1図相当図、第5図は成形品取出し状態
を示す第1図相当図、第6図は本発明に係る装置
の動作を示すタイムチヤートである。
1…固定盤、2…可動盤、10…外周リング、
12…スプルブツシユ、50…ポンチ、51…突
出しピン、57…環状スタンパ、X…固定側金
型、Y…可動側金型。
Fig. 1 is a sectional view of the device according to the present invention, Fig. 2 is a sectional view showing the main parts of the invention, Fig. 3 is a view equivalent to Fig. 1 showing the protruding state of the punch, and Fig. 4 is the mold opening state. FIG. 5 is a view corresponding to FIG. 1 showing a state in which the molded product is taken out, and FIG. 6 is a time chart showing the operation of the apparatus according to the present invention. 1...Fixed plate, 2...Movable plate, 10...Outer ring,
12... Sprue bush, 50... Punch, 51... Ejection pin, 57... Annular stamper, X... Fixed side mold, Y... Movable side mold.
Claims (1)
金型を設け、前記固定盤に対して往復動する可動
盤に可動側金型を固定し、該固定側および可動側
金型の対向面には、型締完了時に該固定側金型と
該可動側金型とが保芯され互いに密着する傾斜部
と端面部とが形成され、 該可動側金型の鏡面にスタンパを保持する外周
スタンパ押えを設けると共に、前記固定側金型に
その内周が金型キヤビテイの外周を規定する外周
リングを設け、かつ、型締完了時に前記外周スタ
ンパ押えと前記外周リングとの間に間隙を形成さ
せ、 該金型キヤビテイの中心部に連通する溶融樹脂
通路を備えたスプルブツシユを移動可能に前記固
定側金型内に挿嵌し、前記可動側金型内に該スプ
ルブツシユに対応する位置に前記金型キヤビテイ
の中心部を貫通するように往復動可能なポンチを
設け、 前記スプルブツシユの後端面に押当自在な、加
熱筒の先端部に取付けられたノズルと、該加熱筒
を前後進させるシリンダ装置と、該シリンダ装置
に接続されたポンチの前進時に前記ノズルのスプ
ルブツシユに対する押圧力を調節する制御弁が介
装された油圧回路とを設け、成形された金型キヤ
ビテイ内の円盤の中心部をポンチで打抜く際、該
スプルブツシユの後退時にポンチの押圧力に抗す
る方向の抵抗力を加えることを特徴とするデイス
クの射出成形装置。[Scope of Claims] 1. A fixed side mold is provided on a fixed plate fixed to the machine base of an injection molding machine, and a movable side mold is fixed on a movable plate that reciprocates with respect to the fixed plate, and the fixed side and The opposing surface of the movable mold is formed with an inclined part and an end surface part, which align the fixed mold and the movable mold and make them come into close contact with each other when mold clamping is completed, and a mirror surface of the movable mold is formed. an outer circumferential stamper holder for holding the stamper, and an outer periphery ring whose inner periphery defines the outer periphery of the mold cavity on the stationary side mold, and when the mold clamping is completed, the outer periphery stamper holder and the outer periphery ring are connected to each other. A sprue bush having a molten resin passage communicating with the center of the mold cavity is movably inserted into the stationary mold, and the sprue bush is inserted into the movable mold. A reciprocating punch is provided at a corresponding position so as to penetrate the center of the mold cavity, and a nozzle attached to the tip of the heating cylinder that can be freely pressed against the rear end surface of the sprue bush; A hydraulic circuit equipped with a control valve that adjusts the pressing force of the nozzle against the sprue bushing when the punch connected to the cylinder device moves forward and backward is provided. A disk injection molding apparatus characterized in that when punching out the center of a disk with a punch, a resistance force is applied in a direction that resists the pressing force of the punch when the sprue bushing retreats.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4053886A JPS62198422A (en) | 1986-02-26 | 1986-02-26 | Injection molder for disk |
EP86118132A EP0247244B1 (en) | 1986-02-26 | 1986-12-30 | Improved molding apparatus and method for producing centrally-apertured discs |
US06/948,223 US4772196A (en) | 1986-02-26 | 1986-12-30 | Molding apparatus for producing centrally-apertured discs |
DE8686118132T DE3683491D1 (en) | 1986-02-26 | 1986-12-30 | MOLDING DEVICE AND METHOD FOR PRODUCING PANELS WITH A MEDIUM HOLE. |
AT86118132T ATE71575T1 (en) | 1986-02-26 | 1986-12-30 | FORMING DEVICE AND METHOD FOR MAKING PLATES WITH CENTER HOLE. |
KR1019870001075A KR900007331B1 (en) | 1986-02-26 | 1987-02-10 | Molding apparatus and method for producing centrally-apertured discs |
AU69096/87A AU585796B2 (en) | 1986-02-26 | 1987-02-20 | Molding apparatus for producing centrally-apertured discs |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4053886A JPS62198422A (en) | 1986-02-26 | 1986-02-26 | Injection molder for disk |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62198422A JPS62198422A (en) | 1987-09-02 |
JPH0338098B2 true JPH0338098B2 (en) | 1991-06-07 |
Family
ID=12583229
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4053886A Granted JPS62198422A (en) | 1986-02-26 | 1986-02-26 | Injection molder for disk |
Country Status (2)
Country | Link |
---|---|
JP (1) | JPS62198422A (en) |
AU (1) | AU585796B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20030034349A (en) * | 2001-10-22 | 2003-05-09 | (주)누리텍 아이엔씨 | A Metallic Mold Device For Modeling Valve Body |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57105328A (en) * | 1980-10-31 | 1982-06-30 | Discovision Ass | Aggregate of valve |
JPS59176029A (en) * | 1983-03-28 | 1984-10-05 | Sony Corp | Releasing method of molded article made of synthetic resin from die |
JPS59229327A (en) * | 1983-06-10 | 1984-12-22 | Seikou Giken:Kk | Mold apparatus for molding resin |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4466934A (en) * | 1980-10-31 | 1984-08-21 | Discovision Associates | Hot sprue valve assembly for an injection molding machine |
US4427352A (en) * | 1982-02-23 | 1984-01-24 | Ptx-Pentronix, Inc. | Mounting structure for die, punch and core rod assembly for compacting powder material |
US4439128A (en) * | 1982-08-27 | 1984-03-27 | Rca Corporation | Apparatus for molding a recorded disc having a molded-in center hole |
-
1986
- 1986-02-26 JP JP4053886A patent/JPS62198422A/en active Granted
-
1987
- 1987-02-20 AU AU69096/87A patent/AU585796B2/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57105328A (en) * | 1980-10-31 | 1982-06-30 | Discovision Ass | Aggregate of valve |
JPS59176029A (en) * | 1983-03-28 | 1984-10-05 | Sony Corp | Releasing method of molded article made of synthetic resin from die |
JPS59229327A (en) * | 1983-06-10 | 1984-12-22 | Seikou Giken:Kk | Mold apparatus for molding resin |
Also Published As
Publication number | Publication date |
---|---|
AU6909687A (en) | 1987-08-27 |
JPS62198422A (en) | 1987-09-02 |
AU585796B2 (en) | 1989-06-22 |
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