JPH0238016A - Structure of metal mold for use in rotary molding - Google Patents
Structure of metal mold for use in rotary moldingInfo
- Publication number
- JPH0238016A JPH0238016A JP18670488A JP18670488A JPH0238016A JP H0238016 A JPH0238016 A JP H0238016A JP 18670488 A JP18670488 A JP 18670488A JP 18670488 A JP18670488 A JP 18670488A JP H0238016 A JPH0238016 A JP H0238016A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- compression rod
- mold
- resin
- movable arm
- 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
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 15
- 239000002184 metal Substances 0.000 title abstract description 6
- 229910052751 metal Inorganic materials 0.000 title abstract description 6
- 230000006835 compression Effects 0.000 claims abstract description 49
- 238000007906 compression Methods 0.000 claims abstract description 49
- 239000011347 resin Substances 0.000 claims abstract description 30
- 229920005989 resin Polymers 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 abstract description 8
- 230000007246 mechanism Effects 0.000 abstract description 6
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 238000001746 injection moulding Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/03—Injection moulding apparatus
- B29C45/04—Injection moulding apparatus using movable moulds or mould halves
-
- 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
- B29C45/76—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00432—Auxiliary operations, e.g. machines for filling the moulds
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】 〈産業上の利用分野〉 この発明はロータリー成形用金型構造に関し。[Detailed description of the invention] <Industrial application field> This invention relates to a rotary mold structure.
よシ限定的には複数の金型（ロータリーユニット）を用
意し、゛これに順次、射出成形機によシ樹脂を充填し、
この金型を他の場所に設けられた複数のプレスユニット
に移送して冷却し成形品を得るンステムにおける金製構
造に関する。In a limited manner, multiple molds (rotary units) are prepared, which are sequentially filled with resin using an injection molding machine.
The present invention relates to a metal structure in a system in which the mold is transferred to a plurality of press units installed at other locations and cooled to obtain a molded product.
〈従来の技術とその課題〉
プラスチックの射出成形では、従来溶融樹脂を金型キャ
ビティー内に充填し、形状を維持する為にその場で圧力
を加えたまま冷却する。そして固化した樹脂をその場で
取シ出すという工程をとる。<Conventional technology and its issues> In plastic injection molding, conventionally, molten resin is filled into a mold cavity and cooled on the spot while pressure is applied to maintain the shape. Then, a step is taken to take out the solidified resin on the spot.
更に、厚肉の物や、高精度なレンズ等の場合は。Furthermore, in the case of thick-walled objects or high-precision lenses, etc.
金製温度を樹脂のガラス転移点以上の温度に昇温して、
射出充填する。その後少なくとも、ガラス転移点以下の
温度になるまでは、成形品内に温度分布が生じない様に
冷却をしなくてはならない。By raising the temperature of the metal to a temperature above the glass transition point of the resin,
Injection filling. Thereafter, the molded product must be cooled at least until the temperature reaches the glass transition point or lower so that no temperature distribution occurs within the molded product.
この時の冷却勾配は、高精度になればなる程、緩くなる
。したがって、厚肉品及び高精度成形品を成形する場合
には、昇温工程、射出・保圧工程、冷却工程、取シ出し
工程という成形サイクルを経て、初めて、次の成形に移
ることができるが、射出成形機の本来の機能である射出
・保圧機能を使用する時間は、成形サイクルの内のごく
短時間に過ぎない。The cooling gradient at this time becomes gentler as the precision increases. Therefore, when molding thick-walled products and high-precision molded products, it is only possible to move on to the next molding after passing through the molding cycle of heating process, injection/holding process, cooling process, and ejecting process. However, the injection and pressure holding functions, which are the original functions of an injection molding machine, are used only for a very short time in the molding cycle.
この様に、射出成形機の本来の稼動時間は短く、作動効
率が非常に低いという実態がある。しかも、前記のよう
に、厚肉太物部品及び高精度プラスチックレンズでは、
その精度が高く、肉厚が厚くなる程、冷却時間が長く必
要となシ、ますます成形機の使用効率が悪くなる。As described above, the actual operating time of an injection molding machine is short and the operating efficiency is extremely low. Moreover, as mentioned above, for thick parts and high precision plastic lenses,
The higher the accuracy and the thicker the wall, the longer the cooling time is required, and the more inefficient the use of the molding machine becomes.
これを改善するため複数の金型を用意し、射出成形機に
より各金型に樹脂を充填後、それらの金型を別の場所に
設けられた複数のプレスユニットへ移送し、そこにおい
てプレスユニットに設けられた温調板によジグレス接触
することによシ金型の熱を温調板へ逃がして金型を冷却
し成形品を得。In order to improve this, multiple molds are prepared, each mold is filled with resin using an injection molding machine, and then those molds are transferred to multiple press units installed in different locations, where the press unit The heat of the mold is released to the temperature control plate by making jigless contact with the temperature control plate installed on the plate, and the mold is cooled and a molded product is obtained.
成形品が取り出された金製を再び射出成形機に戻して循
環させるという、いわゆるロータリー成形方法が提案さ
れている（例；特開昭６１−８９０１９号公報）。A so-called rotary molding method has been proposed in which the molded product is returned to the injection molding machine and circulated therein (for example, Japanese Patent Application Laid-Open No. 61-89019).
しかし、厚肉及び高精度が要求されるプラスチックレン
ズ等を成形する場合、プレスユニット等の作動機能を持
った装置を用いて、温調板を当接することで、金型を冷
却していく方法を取ると、成形品の肉厚及び樹脂の熱伝
導率によって、冷却時間は決ってしまう。無理に冷却勾
配をきつく、つまり冷却時間を短くすると、成形品内部
に温度差が生じ、成形品内部が流動状態であっても、成
形品表面が先に固化してしまう。その後、成形品内部が
固化していくと共に、内部の樹脂が熱収縮して、固化し
ている外表面を引張り、表面形状を崩して、ひけを発生
させてしまう。However, when molding plastic lenses that require thick walls and high precision, there is a method of cooling the mold by using a device with operating functions such as a press unit and touching a temperature control plate. If the cooling time is determined by the thickness of the molded product and the thermal conductivity of the resin. If the cooling gradient is forced to be too steep, that is, the cooling time is shortened, a temperature difference will occur inside the molded product, and even if the inside of the molded product is in a fluid state, the surface of the molded product will solidify first. Thereafter, as the inside of the molded product solidifies, the resin inside heat-shrinks and stretches the solidified outer surface, disrupting the surface shape and causing sink marks.
本発明はこのような問題点に鑑みてなされたものであっ
て、その目的とするところは、射出成形機で樹脂を射出
した金型をプレスユニットで冷却する場合に、ヒケを防
止でき、キャビテイ面の転写性を向上させうるような金
型の構造を提供するにある。The present invention has been made in view of these problems, and its purpose is to prevent sink marks and reduce cavity damage when a mold into which resin has been injected in an injection molding machine is cooled in a press unit. An object of the present invention is to provide a mold structure that can improve surface transferability.
く課題を解決するための手段〉
上記目的は、キャピテイを有し次固定駒と、前記固定駒
のキャビティとともに成形面を形成するキャビティを有
し友可動駒と、前記可動駒を駆動する圧縮ロッドとを備
え、プレスユニットによジグレス冷却する際にプレスユ
ニットに設けられた所定手段によシ前記圧袷ロッドを金
型外部より押圧して成形樹脂を圧縮成形するようにした
ことを特徴とするロータリー成形用金型構造の提供によ
シ達成される。Means for Solving the Problems> The above object is to provide a second fixed piece having a cavity, a companion movable piece having a cavity that forms a molding surface together with the cavity of the fixed piece, and a compression rod for driving the movable piece. A rotary rotary, characterized in that, when the press unit performs jigless cooling, the compression rod is pressed from outside the mold by a predetermined means provided in the press unit to compression mold the molded resin. This is achieved by providing a mold structure for molding.
く作用〉
プレスユニットによシ冷却する際に、圧縮ロッドにより
可動駒を加圧するため、キャピテイ内の樹脂内圧が高め
られて、ヒケが防止され、キャビテイ面の転写性が向上
される。Effects> When the press unit cools the movable piece, the compression rod presses the movable piece, so the internal pressure of the resin in the cavity is increased, preventing sink marks and improving the transferability of the cavity surface.
また、圧縮ロッドの抑圧はプレスユニットに設けられた
所定手段によυ金型外部よシ行うため、金型内には圧縮
ロッドのみが配設され、その抑圧手段等は配設されず、
金を構造が容易である。In addition, since the compression rod is suppressed from the outside of the υ mold by a predetermined means provided in the press unit, only the compression rod is disposed inside the mold, and no suppression means etc. are disposed inside the mold.
Gold is easy to structure.
〈実施例〉
以下、第１図に基づいて本発明の１実施例を詳細に説明
する。<Example> Hereinafter, one example of the present invention will be described in detail based on FIG.
第１図は本実施例に係る金型構造を示す縦断面図である
。FIG. 1 is a longitudinal sectional view showing the mold structure according to this embodiment.
同図において、１は第１側取付板、２は第１側型板、３
は第２側型板、４は第２側受板、５は第２側取付板、６
は第１側固定駒、７は第１側固定駒、８は第２側固定駒
、９は第２側可動駒、１０は圧縮ロッド、１１はキャビ
ティ、１２は本実施例に係る金型を示す。ここに第１側
及び第２側とは凰開きの際金製１１が第１側と第２側の
間を境として開くことを表わすための接頭語である。In the figure, 1 is a first side mounting plate, 2 is a first side mold plate, and 3 is a first side mounting plate.
is the second side mold plate, 4 is the second side receiving plate, 5 is the second side mounting plate, 6
1 is a first side fixed piece, 7 is a first side fixed piece, 8 is a second side fixed piece, 9 is a second side movable piece, 10 is a compression rod, 11 is a cavity, and 12 is a mold according to this embodiment. show. Here, the terms "first side" and "second side" are prefixes to indicate that the metal 11 opens at the border between the first side and the second side when opening the opening.
キャピテイ部１１の第１側における面は、第１側固定駒
６、第１側固定駒７により構成されている。第１側固定
駒７のキャビテイ面は中心部がくほんだ形状となってい
る。第１側固定駒６は円筒形であり、これに第１側固定
駒７を嵌入することによシキャビティ１１の第１側部分
が形成されておシ、固定駒６，７は第１側型板２に取り
付けられている。キャピテイ部１１の第１側における面
は移動しない。The surface on the first side of the capity portion 11 is constituted by a first side fixing piece 6 and a first side fixing piece 7. The cavity surface of the first side fixed piece 7 has a hollow shape at the center. The first side fixing piece 6 has a cylindrical shape, and the first side part of the cavity 11 is formed by fitting the first side fixing piece 7 into the first side fixing piece 6. It is attached to the template 2. The surface on the first side of the cavity portion 11 does not move.
キャビティ部１１の第２側における面は第２側固定駒８
及び可動腕９によシ構成されている。キャピテイ１１は
中心部が厚肉となったレンズ状形態であシ、厚肉な中心
部の下側のキャビテイ面を可動腕９が形成している。従
りて可動腕９のキャビテイ面は中心部がくほんだ曲面と
なりている。The surface on the second side of the cavity part 11 is the second side fixing piece 8
and a movable arm 9. The cavity 11 has a lens-like shape with a thick center, and the movable arm 9 forms a cavity surface below the thick center. Therefore, the cavity surface of the movable arm 9 is a curved surface with a hollow center.
第２側固定駒８は可動腕９を包むような円筒形状で、第
２側型板３に固定されておシ、可動腕９は固定駒８に対
して摺動可能となっている。ただし、摺動詞の隙間から
樹脂等が漏れないように可動腕９の外面及び固定駒８の
内部の寸法は高い公差（例えばスキマ３μｍ以下）で仕
上けられている。The second side fixed piece 8 has a cylindrical shape that wraps around the movable arm 9, and is fixed to the second side mold plate 3, so that the movable arm 9 can slide with respect to the fixed piece 8. However, the outer surface of the movable arm 9 and the inner dimensions of the fixed piece 8 are finished with high tolerances (for example, a gap of 3 μm or less) to prevent resin etc. from leaking from the gaps between the slides.
なお、可動腕９は下部に鍔部１３が設けられており、鍔
部１３が固定駒８に当接することによシ、可動腕９が上
方に抜は出るのを防止している。後述するように油圧シ
リンダ等の抑圧機構によシ圧縮ロッド１０を介して可動
腕９が最も上の位置まで摺動したとき、可動腕９のキャ
ビティを形成する面の周囲の輪郭線は固定駒８の上面の
内側輪郭線と一致するようになっている。The movable arm 9 is provided with a flange 13 at its lower portion, and the flange 13 abuts against the fixed piece 8 to prevent the movable arm 9 from being pulled out upward. As will be described later, when the movable arm 9 is slid to the uppermost position via the compression rod 10 by a compression mechanism such as a hydraulic cylinder, the contour line around the surface forming the cavity of the movable arm 9 will be similar to that of the fixed piece. It is designed to match the inner contour line of the upper surface of 8.
一方可動駒９の下面は圧縮ロッド１０に当接している。On the other hand, the lower surface of the movable piece 9 is in contact with the compression rod 10.
圧縮ロッド１０は第２側製板、受板、取付板３，４．５
に開けられた孔１８に沿って摺動可能に下方に延びてお
シ、圧縮ロッド１０の下端は金型１２の外部に開放され
ている。孔１８は圧縮ロッド１０の上下方向の摺動を案
内することができればよいため、可動腕９と固定駒８と
の摺動の際の樹脂もれ等の防止のための高い公差要求の
ような、高い公差は孔１８の内面寸法と圧縮ロッド１０
の外面寸法との間には要求されない。圧縮ロッド１０の
上端部には鍔部１４が設けられている。固定駒８、可動
腕９及び圧縮ロッドの鍔部１４は、第２側型板３に穿設
された孔１５内に配置されておシ、孔１５の深さは円筒
状固定駒８の高さ、可動腕９の鍔部１３の高さ、圧縮ロ
ッド１０の鍔部１４の高さ、及び可動腕９の移動長さを
加えた深さ以上となっている。圧縮ロッドの鍔部１４が
孔１５の底面に当接することによシ、第１圧縮ロツド１
０の下方向への摺動が制限され、これによシ、可動腕９
の下方向への摺動が制限される。なお、第１圧縮ロンド
ｌＯが最も下の位置まで摺動したときに圧縮ロッド１０
の下端が金型１２の第２側取付板５の下端面よシ突出す
ることがないように、圧縮ロッド１０の長さが定められ
ている。The compression rod 10 has a second side plate, a receiving plate, and a mounting plate 3, 4.5.
The compression rod 10 extends downwardly so as to be slidable along a hole 18 formed in the mold 12, and the lower end of the compression rod 10 is open to the outside of the mold 12. Since the hole 18 only needs to be able to guide the vertical sliding movement of the compression rod 10, high tolerances are required to prevent resin leakage when the movable arm 9 and the fixed piece 8 slide. , high tolerances are required for the inner dimensions of the hole 18 and the compression rod 10.
There is no requirement between the external dimensions of the A collar portion 14 is provided at the upper end of the compression rod 10 . The fixed piece 8, the movable arm 9, and the collar 14 of the compression rod are arranged in a hole 15 bored in the second side mold plate 3, and the depth of the hole 15 is equal to the height of the cylindrical fixed piece 8. The depth is greater than the sum of the height of the flange 13 of the movable arm 9, the height of the flange 14 of the compression rod 10, and the moving length of the movable arm 9. When the flange 14 of the compression rod comes into contact with the bottom surface of the hole 15, the first compression rod 1
The downward sliding movement of the movable arm 9 is restricted.
downward sliding is restricted. Note that when the first compression rod 1O slides to the lowest position, the compression rod 10
The length of the compression rod 10 is determined so that the lower end does not protrude beyond the lower end surface of the second side mounting plate 5 of the mold 12.
次に本実施例に係る金型１２の動作について説明する。Next, the operation of the mold 12 according to this embodiment will be explained.
まず金型１２は第１図に示すように型が締められキャビ
ティ部１１が形成された状態で射出成形機へ送られ、キ
ャビティ部１１に約２２０℃の樹脂が射出される。後述
するようにプレスユニットにおいて冷却する際、油圧シ
リンダ等の押圧機構によシ圧縮ロッド１０を介して可動
腕９が押し上げられ、その状態で硬化した樹脂をを開き
して成形品として取シ出し、再び型締めし、射出成形機
へ送るものであるため、射出成形機で金型１２のキャビ
ティ１１へ樹脂を射出する段階において、可動腕９又は
可動腕９及び圧縮ロッド１０が押し上げられたままの状
態の場合もありうる。しかし、キャビティ１１へ樹脂を
射出する際、その圧力によシ可動駒９又は可動腕９及び
圧縮ロッド１ｏが押し下げられるため、キャビティ１１
は樹脂を射出する際の正しい形状に復帰する。First, the mold 12 is tightened to form a cavity 11 as shown in FIG. 1, and then sent to an injection molding machine, where resin at about 220° C. is injected into the cavity 11. As will be described later, when cooling in the press unit, the movable arm 9 is pushed up via the compression rod 10 by a pressing mechanism such as a hydraulic cylinder, and in this state the hardened resin is opened and taken out as a molded product. , because the mold is clamped again and sent to the injection molding machine, the movable arm 9 or the movable arm 9 and the compression rod 10 remain pushed up during the stage when the injection molding machine injects the resin into the cavity 11 of the mold 12. It is possible that the situation is However, when injecting resin into the cavity 11, the movable piece 9 or the movable arm 9 and the compression rod 1o are pushed down by the pressure, so the cavity 11
will return to the correct shape when injecting the resin.
なお、射出成形機へ移送する前に昇温機によシ予め金型
を１２０℃前後に加熱する。Note that before transferring to the injection molding machine, the mold is preheated to around 120° C. using a heating machine.
樹脂が充填された金型は次に複数のプレスユニットの１
つへ移送される。そして、プレスユニットの抑圧面に設
けられた温調板によシ金型１２の両端面、すなわち第１
側取付板１及び第２側取付板５の端面１６，１７を挾持
して、金型１２の熱を温調板へ移動させ、金型１２を８
０℃に冷却する。The mold filled with resin is then pressed into one of multiple press units.
transferred to one. Then, both end surfaces of the mold 12, that is, the first
By sandwiching the end surfaces 16 and 17 of the side mounting plate 1 and the second side mounting plate 5, the heat of the mold 12 is transferred to the temperature control plate, and the mold 12 is
Cool to 0°C.
この際、第２側取付板５の端面１７が当接する温調板等
には圧縮ロッド１０を押圧する油圧シリンダ等の抑圧機
構が設けられている。プレスユニットの押圧面に設けら
れた温調板によシ金型１２の両端面が挾持された後、こ
の押圧機構によシ圧縮ロッド１０が所定長さ（例えば肉
厚１５■のレンズを成形する場合は０．９ ｔｍ ）だ
け押圧され、従って圧縮ロッド１０に当接している可動
腕９が同量だけ上昇する。このとき、可動腕９のキャビ
ティを形成する面の周囲の輪郭線が固定駒８の上面の内
側輪郭線と一致した状態となる。この状態で。At this time, a suppression mechanism such as a hydraulic cylinder that presses the compression rod 10 is provided on the temperature control plate or the like that the end surface 17 of the second side mounting plate 5 comes into contact with. After both end surfaces of the mold 12 are clamped by the temperature control plates provided on the pressing surface of the press unit, the compression rod 10 is pressed by this pressing mechanism to mold a lens of a predetermined length (for example, a wall thickness of 15 mm). 0.9 tm ), and therefore the movable arm 9 in contact with the compression rod 10 rises by the same amount. At this time, the contour line around the surface forming the cavity of the movable arm 9 matches the inner contour line of the upper surface of the fixed piece 8. In this condition.
すなわちキャビティ内の樹脂内圧が所定量高められた状
態で樹脂の冷却硬化が行なわれるため、ヒケが防止され
、キャビテイ面の転写性が向上される。That is, since the resin is cooled and hardened while the internal pressure of the resin in the cavity is increased by a predetermined amount, sink marks are prevented and the transferability of the cavity surface is improved.
樹脂が硬化し成形品が形成された後は、第１側型板２と
第２側型板３との間で型開きを行ない。After the resin is cured and a molded product is formed, the mold is opened between the first side template 2 and the second side template 3.
成形品を取り出し、再びを締を行ない、この金型は再び
射出成形機又は昇温機へ送られ、上記工程が繰シ返され
る。The molded product is removed and tightened again, and the mold is sent to the injection molding machine or heating machine again, and the above steps are repeated.
第２図は本発明の他の実施例に係る金型構造を示す縦断
面図である。FIG. 2 is a longitudinal sectional view showing a mold structure according to another embodiment of the present invention.
同図において第１図と同符号のものは同一のものを示し
ておシ説明を詳略する。In this figure, the same reference numerals as in FIG. 1 indicate the same parts, and the detailed explanation will be omitted.
第１図に示す実施例においては、キャビティ１１のうち
厚肉部を形成するキャビテイ面を可動腕とし樹脂の熱収
縮が特に大きい厚肉部の熱収縮に対応して可動腕を移動
させたが、本実施例では第２図に示すように厚肉部以外
のキャビテイ面をも即ち、キャビティｌ１ｍの下側曲面
全体を可動腕９ａで形成し、樹脂の熱収縮に対応して可
動腕９ａを移動させることによシキャビティｔＸａの下
側曲面全体を移動させるものである。成形品の形状の設
計に際しては、圧縮ロッド１０で可動腕９ａが押し上げ
られた時のキャビティｌ１ｍの形状を成形品の正しい形
状として設計する他、成形品の面形状のみが重要な場合
等においては、可動腕９ａが下がった状態即ち、樹脂の
射出時のキャピテイｌｌａの形状を成形品の正しい形状
として設計する。In the embodiment shown in FIG. 1, the cavity surface forming the thick wall portion of the cavity 11 is used as a movable arm, and the movable arm is moved in response to the heat contraction of the thick wall portion where the heat shrinkage of the resin is particularly large. In this embodiment, as shown in FIG. 2, the cavity surface other than the thick part, that is, the entire lower curved surface of the cavity l1m, is formed by the movable arm 9a, and the movable arm 9a is moved in response to the thermal contraction of the resin. By moving, the entire lower curved surface of the cavity tXa is moved. When designing the shape of the molded product, in addition to designing the shape of the cavity l1m when the movable arm 9a is pushed up by the compression rod 10 as the correct shape of the molded product, in cases where only the surface shape of the molded product is important, etc. The shape of the cavity when the movable arm 9a is lowered, that is, the resin is injected, is designed as the correct shape of the molded product.
上記実施例においては、射出成形機により樹脂をキャビ
ティｌｌ内へ射出する時の圧力によシ可動駒９が下がる
ため、この作用によシ圧縮ロッド１０が下方向へ下がる
としたが１例えば圧縮ロッドの鍔１４の上面と第２側固
定駒８の下面との間にバネ部材等を装着し、バネ部材等
の弾性力によシ圧縮ロッド１０を強制的に押し下げても
よい。In the above embodiment, the movable piece 9 is lowered by the pressure when resin is injected into the cavity 11 by the injection molding machine, and the compression rod 10 is lowered downward by this action. A spring member or the like may be installed between the upper surface of the rod collar 14 and the lower surface of the second side fixing piece 8, and the compression rod 10 may be forcibly pushed down by the elastic force of the spring member or the like.
〈発明の効果〉
本発明に係る金型構造はプレスユニットによシ冷却する
際に、圧縮ロッドによシ可動駒を加圧するため、キャピ
テイ内の樹脂内圧が高められて、ヒケが防止され、キャ
ビテイ面の転写性が向上される。これによりロータリー
成形システムにおける、冷却工程に要する時間を短縮す
ることができ、ロータリー成形システムの設計に際し、
複数のプレスユニット数の台数の削減、従って設備投資
の削減、配置スペースの削減等を図ることができる。<Effects of the Invention> When the mold structure according to the present invention is cooled by the press unit, the movable piece is pressurized by the compression rod, so the internal pressure of the resin in the cavity is increased, and sink marks are prevented. The transferability of the cavity surface is improved. As a result, the time required for the cooling process in the rotary molding system can be shortened, and when designing the rotary molding system,
It is possible to reduce the number of multiple press units, thereby reducing equipment investment, reducing installation space, etc.
また、圧縮ロッドの押圧はプレスユニットに設けられた
所定手段によシ金型外部より行うため、金型内には圧縮
ロッドのみが配設され、その抑圧手段等は配設されず、
金型構造が容易である。In addition, since the compression rod is pressed from outside the mold by a predetermined means provided in the press unit, only the compression rod is disposed inside the mold, and no means for suppressing it is disposed.
The mold structure is easy.
更に、可動腕の加圧は可動腕とは分離した圧縮ロッドを
可動腕に当接させ押圧することによシ行うため、可動腕
とこれに摺接する固定駒との間の摺動面を高精度に仕上
げておき、圧縮ロッドとそれに摺接する孔との間の寸法
公差は厳密性が要求されないため低精度に仕上げてよく
、従って金型の製作が容易である。また、圧縮ロッドと
それに摺接する孔とは密接していないため、圧縮ロッド
及び可動腕を押し上げるための力は小さくてすみ、また
可動腕及び圧縮ロッドを押し下げる力が小さくてすむ。Furthermore, since the movable arm is pressurized by contacting and pressing a compression rod that is separate from the movable arm, the sliding surface between the movable arm and the fixed piece that slides on it is raised. Since the dimensional tolerance between the compression rod and the hole in sliding contact with the compression rod is not required to be exact, it can be finished with low precision, and therefore the mold can be manufactured easily. Further, since the compression rod and the hole in sliding contact therewith are not in close contact with each other, the force required to push up the compression rod and the movable arm is small, and the force required to push down the movable arm and the compression rod is small.
第１図は本発明の１実施例に係る金型構造の縦断面図で
あシ、第２図は本発明の他の実施例に係る金型構造の縦
断面図である。
６．７．８．８ａ・・・固定駒、９，９ａ・・・可動腕
１０・・・圧縮ロッド、１１．ｌｌａ・・・キャビティ
、１２．２２・・・金を。
代理人 弁理士 山 下 穣 平
／FIG. 1 is a vertical cross-sectional view of a mold structure according to one embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view of a mold structure according to another embodiment of the present invention. 6.7.8.8a...Fixed piece, 9,9a...Movable arm 10...Compression rod, 11. lla...cavity, 12.22...gold. Agent Patent Attorney Johei Yamashita/
Claims (1)
とともに成形面を形成するキャビティを有した可動駒と
、前記可動駒を駆動する圧縮ロッドとを備え、プレスユ
ニットによりプレス冷却する際にプレスユニットに設け
られた所定手段により前記圧縮ロッドを金型外部より押
圧して成形樹脂を圧縮成形するようにしたことを特徴と
するロータリー成形用金型構造。A fixed piece having a cavity, a movable piece having a cavity that forms a molding surface together with the cavity of the fixed piece, and a compression rod that drives the movable piece, and is installed in the press unit when press cooling is performed by the press unit. A mold structure for rotary molding, characterized in that the compression rod is pressed from outside the mold by a predetermined means provided in the mold to compression mold the molded resin.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18670488A JPH0238016A (en) | 1988-07-28 | 1988-07-28 | Structure of metal mold for use in rotary molding |
| US07/385,364 US5075051A (en) | 1988-07-28 | 1989-07-27 | Molding process and apparatus for transferring plural molds to plural stations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18670488A JPH0238016A (en) | 1988-07-28 | 1988-07-28 | Structure of metal mold for use in rotary molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0238016A true JPH0238016A (en) | 1990-02-07 |
Family
ID=16193174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18670488A Pending JPH0238016A (en) | 1988-07-28 | 1988-07-28 | Structure of metal mold for use in rotary molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0238016A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101934569A (en) * | 2009-06-30 | 2011-01-05 | 上海三槐科技有限公司 | Unlocking and drafting mechanism of mold retractable fully automatic hose shoulder-injecting machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60159021A (en) * | 1984-01-31 | 1985-08-20 | Alps Electric Co Ltd | Mold for producing plastic lens |
-
1988
- 1988-07-28 JP JP18670488A patent/JPH0238016A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60159021A (en) * | 1984-01-31 | 1985-08-20 | Alps Electric Co Ltd | Mold for producing plastic lens |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101934569A (en) * | 2009-06-30 | 2011-01-05 | 上海三槐科技有限公司 | Unlocking and drafting mechanism of mold retractable fully automatic hose shoulder-injecting machine |
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