JPS6132729A - Method and apparatus for preparing hollow molded product - Google Patents
Method and apparatus for preparing hollow molded productInfo
- Publication number
- JPS6132729A JPS6132729A JP15472784A JP15472784A JPS6132729A JP S6132729 A JPS6132729 A JP S6132729A JP 15472784 A JP15472784 A JP 15472784A JP 15472784 A JP15472784 A JP 15472784A JP S6132729 A JPS6132729 A JP S6132729A
- Authority
- JP
- Japan
- Prior art keywords
- core
- sleeve
- cavity
- molded product
- pin member
- 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
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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/36—Moulds having means for locating or centering cores
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、中空成形品の製造方法および装置に関し、一
層詳細にはキャビティ内に中空成形品を作る中子を配置
し、この中子を複数個のアクチュエータから延在するロ
ットで支承し、成形材料注入時にこれらのロットを進退
動作させて成形品を製造する中空成形品の製造方法およ
び装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing a hollow molded product, and more particularly, a core for making a hollow molded product is arranged in a cavity, and the core is extended from a plurality of actuators. The present invention relates to a method and apparatus for manufacturing a hollow molded product, in which the molded product is manufactured by supporting the lots in lots and moving these lots back and forth during injection of molding material.
従来から、成形品の製造には加熱されて溶融または軟化
した成形材料を金型内のキャビティに注入充填して成形
品を得る射出成形、トランスファ成形等の成形方法が採
用されている。このような成形方法において中空形状を
有する成形品を得るために次のような手段が用いられて
きた。すなわち、先ず、完成品の半割形状に対応する金
型を作り、このような−組の金型により夫々成形された
半割形状製品を必要に応してさらに切削加工や仕上げを
行う。次いで、これらを接着剤等により接着し一体化し
て後完成品とするのである。BACKGROUND ART Conventionally, molding methods such as injection molding and transfer molding, in which a molded product is obtained by injecting and filling a heated, melted or softened molding material into a cavity in a mold, have been employed to manufacture molded products. In such a molding method, the following methods have been used to obtain a molded product having a hollow shape. That is, first, a mold corresponding to the halved shape of the finished product is made, and the half-shaped products molded by the two sets of molds are further subjected to cutting and finishing as necessary. Next, these are bonded together using an adhesive or the like to form a finished product.
第1a図および第1b図は、このようにして得られる中
空形状を有する樹脂成形製品の一例として屈曲管10を
示している。屈曲管10ば正四角柱状の断面を有する角
柱管であるが、2ケ所長手方向において屈曲しているた
め、これらの屈曲部に挟まれた部分10aの軸方向は両
端部10bの軸方向に対し傾斜している。FIGS. 1a and 1b show a bent tube 10 as an example of a resin molded product having a hollow shape obtained in this way. The bent tube 10 is a prismatic tube with a square cross section, but since it is bent in the longitudinal direction at two points, the axial direction of the portion 10a sandwiched between these bent portions is different from the axial direction of both end portions 10b. It is sloping.
このような形状を有する屈曲管10を成形するために次
のような工程がとられるのが一般的である。すなわち、
第2a図、第2b図に示されているように、先ず、屈曲
管10の半割部品12.14を射出成形、トランスファ
成形等の方法で成形する。さらにこれらの半割部品12
.14に必要に応じ機械加工を施した後、それらの対応
面12a、14aを接着剤等で接着して一体化し屈曲管
10とする。In order to form the bent tube 10 having such a shape, the following steps are generally taken. That is,
As shown in FIGS. 2a and 2b, first, the half parts 12, 14 of the bent tube 10 are molded by injection molding, transfer molding, or the like. Furthermore, these half parts 12
.. 14 is machined as necessary, and then the corresponding surfaces 12a and 14a are bonded together with an adhesive or the like to form the bent tube 10.
従って、屈曲管10を得るためには射出成形等の成形工
程のみならず機械加工工程や接着工程が必要となり、一
旦半割部品に成形して後中空成形品を得るには多大の時
間と労力がかかるという難点があった。Therefore, in order to obtain the bent tube 10, not only a molding process such as injection molding but also a machining process and an adhesion process are required, and it takes a great deal of time and labor to once form a half-split part and then obtain a hollow molded part. The problem was that it took a lot of time.
このような従来技術を克服するためには、例えば、溶解
性または溶融性材料よりなる屈曲棒状の中子をこれに対
応する形状のキャビティ内に成形補助部材で支承し、こ
の中子とキャビテイ面の画成する屈曲管状空間に成形材
料を注入し、直接屈曲管状の成形品を得る方法が考えら
れる。In order to overcome such conventional techniques, for example, a bent rod-shaped core made of a soluble or meltable material is supported in a cavity of a corresponding shape by a molding auxiliary member, and this core and the cavity surface are supported. A possible method is to directly obtain a bent tubular molded product by injecting a molding material into the bent tubular space defined by the bent tubular space.
そのような方法によって屈曲管を得る場合の実施例を第
3図に示す。そこで、この方法では金型16は固定型1
8、可動型20および取付板22を備える。この装置で
は前記固定型18、可動型20に夫々設けられた凹部1
8a、20aにより金型16内にキャビティ16aが画
成される。前記キャビティ16a内には水溶性材料また
は低融点金属等の溶融性材料よりなる中子24が配設さ
れ、その両端部24a、24bが金型16により支持さ
れる。An embodiment in which a bent tube is obtained by such a method is shown in FIG. Therefore, in this method, the mold 16 is the fixed mold 1.
8, a movable mold 20 and a mounting plate 22 are provided. In this device, recesses 1 are provided in the fixed mold 18 and the movable mold 20, respectively.
A cavity 16a is defined within the mold 16 by 8a and 20a. A core 24 made of a water-soluble material or a melting material such as a low-melting point metal is disposed within the cavity 16a, and both ends 24a and 24b of the core 24 are supported by the mold 16.
一方、可動型20に押出板26を対設し、この押出板2
6から延在する押出ピン28を可動型20に形成された
孔部に挿入する。このような構成において、成形用樹脂
の注入前、中子24はキャビティ16の点線位置を占め
る。ここで固定型18に穿設された湯道18bから溶融
した樹脂が注入されると、その際の注入圧力により中子
24の中央部付近に大きな曲げ応力が発生する。従って
、中子24は可動型20方向に撓み、実線位置の形状を
呈する。すなわち、中子24によって形成しようとする
空間が所期目的の形状と異なる形状を呈するようになる
。この結果、このように撓んだ中子を介して得られる中
空成形品は変形した状態で成形品を形成することになる
。この後、取付板22および可動型16を固定型18か
ら離脱し、押出ピン28を押出板26を介して摺動する
。次いで、屈曲管10を中子24と共に可動型16から
取り外し、中子24を溶解除去して屈曲管lOとする。On the other hand, an extrusion plate 26 is provided opposite to the movable mold 20, and this extrusion plate 2
An extrusion pin 28 extending from 6 is inserted into a hole formed in movable mold 20. In such a configuration, the core 24 occupies the dotted line position in the cavity 16 before injection of the molding resin. When molten resin is injected from the runner 18b drilled in the fixed mold 18, a large bending stress is generated near the center of the core 24 due to the injection pressure at that time. Therefore, the core 24 is bent in the direction of the movable mold 20 and assumes the shape shown by the solid line. In other words, the space to be formed by the core 24 has a shape different from the intended shape. As a result, the hollow molded product obtained through the thus bent core is formed in a deformed state. Thereafter, the mounting plate 22 and the movable mold 16 are removed from the fixed mold 18, and the push-out pin 28 is slid through the push-out plate 26. Next, the bent tube 10 is removed from the movable mold 16 together with the core 24, and the core 24 is dissolved and removed to form the bent tube IO.
結局、金型キャビティ内に中子を介装し、この中子とキ
ャビティにより画成される屈曲管状の空間に樹脂を注入
して直接屈曲管を成形しても樹脂を注入する圧力により
中子に撓みが生じ屈曲管の肉厚が不均一となり、所期の
中空状屈曲管は到底得ることは出来ない。In the end, even if a core is inserted into the mold cavity and resin is injected into the bent tube-shaped space defined by the core and the cavity to directly mold the bent tube, the pressure of injecting the resin will cause the core to The bending occurs and the wall thickness of the bent tube becomes uneven, making it impossible to obtain the desired hollow bent tube.
そこで、本発明者等は鋭意考究を重ねた結果、一方の金
型に対し中空状の円筒体を含む二重構造からなるロッド
を互いに異なるアクチュエータにより変位自在に配設し
ておき、成形材料を注入する際、中空状のロッドの一方
を金型キャビティ内面から中子に指向して突出し、この
中子を支承させて成形材料の注入圧力に対し抗圧可能に
設定しておくと共に他方のロッドは前記中空状のロッド
の内方に位置決めしておき、注入された成形材料が中子
を囲繞し且つ他方のロッドの前端部まで到達した時点で
前記中空状のロッドを退動させ、一方、前記他方のロッ
ドを進動させてこのロッド端面とキャビティ内面とを略
同−面にすれば成形材料注入時の中子の撓みがなくなり
、しかも均一な品質で高密度の中空状成形品が得られ前
記の問題点が一掃されることが判った。Therefore, as a result of extensive research, the present inventors installed a double-structured rod containing a hollow cylindrical body in one mold so that it could be freely displaced by different actuators. During injection, one of the hollow rods is projected from the inner surface of the mold cavity toward the core, and the other rod is set to support the core and resist the injection pressure of the molding material. is positioned inside the hollow rod, and when the injected molding material surrounds the core and reaches the front end of the other rod, the hollow rod is retracted, while, By advancing the other rod to make the end surface of the rod and the inner surface of the cavity substantially flush, the core will not be deflected when the molding material is injected, and a hollow molded product with uniform quality and high density can be obtained. It was found that the above-mentioned problems could be eliminated.
従って、本発明の目的は簡単に且つ確実に成形でき、し
かも品質が均一であると共に高密度の中空成形品が得ら
れる中空成形品の製造方法および装置を従供することに
ある。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method and apparatus for manufacturing a hollow molded product which can be easily and reliably molded, and which has uniform quality and high density.
この目的を達成するため、本発明の方法は固
゛定型と可動型とにより画成されるキャビティ内部
に中子を配置し、前記中子を移動自在なピン部材を内設
したスリーブにより保持し、湯道を介して溶融成形材料
を所定圧力下に前記キャビティと前記スリーブとビン部
材との間に画成される室に至るまで注入し、次いで前記
スリーブを中子より離間させ、さらにピン部材を付勢し
て前記室内の溶融成形材料をキャビティへ押動し、前記
溶融成形材料が固化して後これを前記固定型並びに可動
型から取り出し、さらに中子を除去して成形品を得るこ
とを特徴とする。To achieve this objective, the method of the invention is
A core is placed inside a cavity defined by a fixed mold and a movable mold, the core is held by a sleeve equipped with a movable pin member, and the molten molding material is applied under a predetermined pressure through a runner. The molten molding material in the chamber is injected into the chamber defined between the cavity, the sleeve, and the bottle member, and then the sleeve is separated from the core, and the pin member is urged to pour the molten molding material in the chamber into the cavity. After the molten molding material has solidified, it is removed from the fixed mold and the movable mold, and the core is further removed to obtain a molded product.
また、本発明に係る製造装置は固定型と可動型とから画
成されるキャビティの内部に中子を配設し、前記中子を
アクチュエータにより進退動作するスリーブで支承する
よう構成し、一方、前記スリーブ内部に摺動自在にピン
部材を設け、前記スリーブとビン部材とにより容積を可
変とする室を画成し、ピン部材の付勢により前記室に貯
留された溶融材料をキャビティに押動して成形品を得る
よう構成することを特徴とする。Further, the manufacturing apparatus according to the present invention is configured such that a core is disposed inside a cavity defined by a fixed mold and a movable mold, and the core is supported by a sleeve that is moved forward and backward by an actuator, and on the other hand, A pin member is slidably provided inside the sleeve, a chamber whose volume is variable is defined by the sleeve and the bottle member, and the molten material stored in the chamber is pushed into the cavity by biasing of the pin member. The method is characterized in that it is configured to obtain a molded product.
次に、本発明方法についてそれを実施する装置との関係
において好適な実施例を挙げ添付の図面を参照しながら
以下詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the method of the present invention will be described in detail in relation to an apparatus for carrying out the method, with reference to preferred embodiments and the accompanying drawings.
第4図において、参照符号30は金型を示し、この金型
30は固定型32と可動型34からなる。固定型32と
可動型34の対向面部には夫々四部36.38が形成さ
れ、両者が接する時、屈曲した円柱状の成形用キャビテ
ィ40が画成される。前記キャビティ40には段部42
a、42b並びに44a、44bが形成されると共に固
定型32の略中央部から前記キャビティ40に対して湯
道46が形成される。In FIG. 4, reference numeral 30 indicates a mold, and this mold 30 consists of a fixed mold 32 and a movable mold 34. Four portions 36 and 38 are formed on opposing surfaces of the stationary mold 32 and the movable mold 34, respectively, and when the two come into contact, a curved cylindrical molding cavity 40 is defined. The cavity 40 has a stepped portion 42.
a, 42b and 44a, 44b are formed, and a runner 46 is formed from approximately the center of the fixed mold 32 to the cavity 40.
一方、可動型34にはその下端部からキャビティ40に
連通する孔部48.50および52が穿設されると共に
前記孔部48.52の外側に後述する油圧シリンダ56
a、56bを嵌着するための凹部54a、54bが夫々
形成される。On the other hand, the movable mold 34 is provided with holes 48.50 and 52 communicating with the cavity 40 from its lower end, and a hydraulic cylinder 56 (described later) is provided outside the holes 48.52.
Recesses 54a and 54b are formed, respectively, into which the recesses 54a and 56b are fitted.
次に前記可動型34に固着される取付板58について説
明する。取付板58は第5図から容易に諒解されるよう
に可動型34に接して配設され、その中央部分に室60
が画成される。前記室60の内部には重畳する第1の押
出板62と第2の押出板64とが配設され、前記第2押
出板64には押出ロッド66aおよび66bが係合し、
一方、第1押出板62には圧縮ピン68a、68bおよ
び68cが係着される。実質的には圧縮ピン68a乃至
68cはその一端部に形成されたフランジ部70a、7
0bおよびToeが前記第1押出板62と第2押出板6
4とにより挟持されるよう構成しておく。なお、前記圧
縮ピン68a乃至68Cは孔部4B、50および52を
貫通してキャビティ40に臨む。Next, the mounting plate 58 fixed to the movable mold 34 will be explained. The mounting plate 58 is disposed in contact with the movable mold 34, as can be easily understood from FIG.
is defined. Inside the chamber 60, a first extrusion plate 62 and a second extrusion plate 64 are arranged to overlap each other, and extrusion rods 66a and 66b are engaged with the second extrusion plate 64,
On the other hand, compression pins 68a, 68b, and 68c are engaged with the first extrusion plate 62. Substantially, the compression pins 68a to 68c have flange portions 70a and 70 formed at one end thereof.
0b and Toe are the first extrusion plate 62 and the second extrusion plate 6
The structure is such that it is held between the two. The compression pins 68a to 68C pass through the holes 4B, 50, and 52 and face the cavity 40.
本発明はさらに前記油圧シリンダ56a、56bのシリ
ンダロンドア2a、?2bに支持板体74を係着する。The present invention further provides the cylinder door 2a of the hydraulic cylinders 56a, 56b, ? The support plate body 74 is engaged with 2b.
支持板体74の下面側にはさらに別異の支持板体76が
係着され、前記第1の支持板体74と第2の支持板体7
6との間でスリーブ78a、78bおよび78cを保持
する。前記スリーブ78a乃至78cは、第5図から容
易に諒解されるように、その下端部にフランジ部80a
、80b、80Cを有し、これらのフランジ部80a、
80bおよび80Cを前記第1支持板体74、第2支持
板体76で挟持してこれらのスリーブ78a乃至78C
が保持される。この場合、圧縮ピン68a、68b、6
8cは前記スリーブ78a、78bおよび78Cに夫々
嵌入して変位自在となるよう構成されている。すなわち
、スリーブ78a乃至78Cは可動型34に形成された
孔部48乃至52に夫々嵌入してキャビティ40へと臨
むよう構成されている。なお、第6図に示すように前記
スリーブ78a乃至78cの先端部には夫々ゲート用凹
部82.84が形成される。凹部82並びに84は夫々
−直線状に配置され、しかもこれらのスリーブの先端部
は後述するように中子を支持する際、その中子の外周の
曲率にあわせて湾曲した凹部86を形成するものである
。A different support plate body 76 is further attached to the lower surface side of the support plate body 74, and the first support plate body 74 and the second support plate body 7
6 and hold the sleeves 78a, 78b and 78c. As can be easily understood from FIG. 5, the sleeves 78a to 78c have a flange portion 80a at their lower end.
, 80b, 80C, and these flange portions 80a,
80b and 80C are sandwiched between the first support plate body 74 and the second support plate body 76 to form sleeves 78a to 78C.
is retained. In this case, compression pins 68a, 68b, 6
8c is configured to be fitted into the sleeves 78a, 78b and 78C, respectively, and to be freely displaceable. That is, the sleeves 78a to 78C are configured to fit into holes 48 to 52 formed in the movable mold 34, respectively, and face the cavity 40. As shown in FIG. 6, gate recesses 82 and 84 are formed at the distal ends of the sleeves 78a to 78c, respectively. The recesses 82 and 84 are each arranged in a straight line, and the tips of these sleeves form a recess 86 that is curved to match the curvature of the outer periphery of the core when supporting the core as described later. It is.
本発明に係る中空成形品の製造装置は基本的には以上の
ように構成されるものであって、次にその作用並びに効
果について説明する。The blow molded product manufacturing apparatus according to the present invention is basically constructed as described above, and its operation and effects will be explained next.
先ず、固定型32に対し可動型34を離間した状態で溶
融性材料からなる屈曲形状の中子90を段部42a、4
2bを利用して前記固定型32に一旦係止する。次いで
、可動型34とこれに一体化された取付板58を前記固
定型32に通常の手段を用いて係着する。従って、前記
中子90は段部42a、42b、44a 、44bによ
りしっかりと保持されることが容易に諒解されよう。First, with the movable mold 34 separated from the fixed mold 32, a bent core 90 made of a meltable material is inserted into the stepped portions 42a, 4.
2b to be temporarily locked to the fixed mold 32. Next, the movable mold 34 and the mounting plate 58 integrated therewith are attached to the fixed mold 32 using conventional means. Therefore, it will be easily understood that the core 90 is firmly held by the step portions 42a, 42b, 44a, and 44b.
このようにして中子90を固定した状態で油圧シリンダ
56a、56bを矢印A方向に変位するように駆動すれ
ば支持板体74.76に保持されたスリーブ78a乃至
78cは変位してその湾曲状の凹部86は前記中子90
の湾曲する外周部に当設することになる。この場合、第
7図Aに示すように、圧縮ピン68a乃至68cは図示
しないアクチュエータを介して押出ロッド55a、66
bが駆動されないために前記スリーブ78a乃至78c
の先端部よりも矢印B方向、すなわち、キャビティ40
よりもむしろ図において下方に位置している。そこで湯
道46より溶融した成形材料、例えば合成樹脂材料92
が所定圧力下にキャビティ40内に注入される。その際
、この樹脂材料92は湯道46の軸方向において中子9
0を押圧するが、特にスリーブ78a乃至78cがその
部分の中子90を十分に支承するために中子自体が撓曲
することはない。With the core 90 fixed in this manner, if the hydraulic cylinders 56a and 56b are driven to displace in the direction of arrow A, the sleeves 78a to 78c held by the support plates 74 and 76 will be displaced and curved. The recess 86 is the core 90.
It will be installed on the curved outer periphery of. In this case, as shown in FIG. 7A, the compression pins 68a to 68c are connected to the extrusion rods 55a and 68c via an actuator (not shown).
b is not driven, the sleeves 78a to 78c
from the tip of the cavity 40 in the direction of arrow B, that is, the cavity 40
Rather, it is located at the bottom of the diagram. There, the molding material melted from the runner 46, for example, a synthetic resin material 92.
is injected into the cavity 40 under a predetermined pressure. At this time, this resin material 92 is applied to the core 9 in the axial direction of the runner 46.
However, since the sleeves 78a to 78c sufficiently support the core 90 in that part, the core itself does not bend.
キャビティ40に前記樹脂材料92が十分に充たされる
と、その一部はスリーブ78a乃至78cの凹部82.
84を介してスリーブ78a乃至78Cに夫々臨入する
圧縮ピン68a乃至68Cの先端部にまで至る。この限
りにおいて、樹脂材料92は中子90を除くキャビティ
40の容積分収上に湯道46を介して注入されることに
なる。そこで、このような状態に至ると、油圧シリンダ
56aおよび56bが再び付勢されてスリーブ78a乃
至78Cを第7図(B)の位置に至らしめるまで変位さ
せる。When the cavity 40 is sufficiently filled with the resin material 92, a portion of the resin material 92 fills the recesses 82. of the sleeves 78a to 78c.
84 to the tips of the compression pins 68a to 68C that enter the sleeves 78a to 78C, respectively. To this extent, the resin material 92 will be injected via the runner 46 over the volume of the cavity 40 excluding the core 90 . Therefore, when such a state is reached, the hydraulic cylinders 56a and 56b are energized again to displace the sleeves 78a to 78C until they reach the positions shown in FIG. 7(B).
この結果、スリーブ78a乃至78Cの湾曲凹部86は
中子90から離脱する。As a result, the curved recesses 86 of the sleeves 78a to 78C are separated from the core 90.
然しなから、このような状態では中子90の周囲には湯
道46を介して樹脂材料92が十分にいきわたっている
ために、これによって中子90自体が撓曲する等の不都
合は生じない。なおこの時、湯道46からの樹脂材料9
2の注入は停止されている。However, in such a state, since the resin material 92 is sufficiently spread around the core 90 via the runner 46, this does not cause any inconvenience such as the core 90 itself being bent. . At this time, the resin material 9 from the runner 46
Injection 2 has been stopped.
次いで、図示しないアクチュエータが押出ロッド66a
、66bを駆動して圧縮ピン68a乃至68cを矢印A
方向へと変位させる。この結果、圧縮ピン68a乃至6
8Cはスリーブ78a乃至78cの内部を第5図および
第7図において矢印A方向へと変位し、最終的にはキャ
ビティ40の外周部分に至る。ここで押出ロッド66a
、66bの駆動は停止される。すなわち、第7図Bに示
した圧縮ピン68a乃至68cとスリーブ78a乃至7
8cによって夫々形成される電量部分に入り込んだ樹脂
材料92は矢印A方向へと押し出され、再びキャビティ
40の内部に侵入する。すなわち、キャビティ40の内
部における樹脂材料92は前記圧縮ピン68a乃至68
Cによって押し出された分だけ密度が増し、それが成形
品として取り出されることになる(第7図C参照)。こ
のような状態でキャビティ40内で溶融した樹脂材料9
2が固化すると、取付板58と可動型34とは図示しな
い駆動装置により固定型32から離脱し、中子付きの成
形品が得られる。この中子90は事後的に熱処理または
化学的処理により成形品から除去されるのは勿論である
。Next, an actuator (not shown) pushes the extrusion rod 66a.
, 66b to move the compression pins 68a to 68c in the direction of arrow A.
Displace it in the direction. As a result, the compression pins 68a to 6
8C is displaced inside the sleeves 78a to 78c in the direction of arrow A in FIGS. 5 and 7, and finally reaches the outer peripheral portion of the cavity 40. Here, the extrusion rod 66a
, 66b are stopped. That is, the compression pins 68a to 68c and sleeves 78a to 7 shown in FIG. 7B
The resin material 92 that has entered the capacitive portions formed by 8c is pushed out in the direction of arrow A and enters the inside of the cavity 40 again. That is, the resin material 92 inside the cavity 40 is compressed by the compression pins 68a to 68.
The density increases by the amount extruded by C, and it is taken out as a molded product (see FIG. 7C). The resin material 9 melted in the cavity 40 in this state
2 solidifies, the mounting plate 58 and the movable mold 34 are separated from the fixed mold 32 by a drive device (not shown), and a molded product with a core is obtained. Of course, this core 90 is later removed from the molded product by heat treatment or chemical treatment.
本発明によれば以上のように中子自体を注入される樹脂
材料の圧力により撓曲させることなく所望の中空成形品
を得ることが出来、しかもその成形品の密度も前記のよ
うに圧縮ピンにより樹脂材料注入口とは反対の方向から
逆に押し出されるようにしている。従って、湯道46を
介してのみ樹脂材料をキャビティに注入すると、その反
対側に十分に当該樹脂材料を到達させるために相当な加
圧力を必要とし、このために中子自体にクラックが生じ
てこれが成形品の不良につながる場合もあるが、本発明
のような方法および装置では係る懸念は存在することな
く前記の通り圧縮ピンの逆方向への押し出し作用により
却って成形品自体の密度を無理なく高揚させることがで
きる。このため、製品の均質化と不良率の低下を回避で
き、さらにまた中子には実質的に曲げ応力が発生するこ
となく中子の撓み、破損の問題も生じないため一層優れ
た製品を得ることができる。According to the present invention, it is possible to obtain a desired hollow molded product without bending the core itself due to the pressure of the injected resin material, and the density of the molded product is also lower than that of the compression pin as described above. This causes the resin material to be extruded in the opposite direction from the resin material injection port. Therefore, if the resin material is injected into the cavity only through the runner 46, a considerable pressure will be required to sufficiently reach the opposite side, which may cause cracks in the core itself. This may lead to defects in the molded product, but with the method and device of the present invention, there is no such concern, and as mentioned above, the density of the molded product itself can be reduced without difficulty due to the pushing action of the compression pin in the opposite direction. It can be uplifting. As a result, it is possible to avoid homogenization of the product and a decrease in the defective rate.Furthermore, since there is virtually no bending stress on the core, there are no problems with the core being bent or damaged, resulting in even better products. be able to.
以上、本発明につき好適な実施例を挙げて説明したが、
本発明はこの実施例に限定されるものではなく、本発明
の要旨を逸脱しない範囲において種々の改良並びに設計
の変更が可能なことは勿論である。The present invention has been described above with reference to preferred embodiments, but
It goes without saying that the present invention is not limited to this embodiment, and that various improvements and changes in design are possible without departing from the gist of the present invention.
4、図面(D@RfLすaF’A
第1a図は合成樹脂からなる屈曲管の軸方向断面図、第
1b図は第1a図のIb−1b線断面図、第2a図は第
1a図、第1b図に示す屈曲管の半割部品の軸方向断面
図、第2b図は前記第2a図のnb−nb線断面図、第
3図は従来技術により屈曲管を成形する場合の成形工程
における金型と中子との相関関係を示す断面図、第4図
は本発明を用いて屈曲管を成形する場合の金型の縦断面
図、第5図は第4図に示す金型に油圧シリンダ、スリー
ブおよびこのスリーブの内部で摺動する圧縮ピンを配設
した状態の縦断説明図、第6閏は第5図に示すスリーブ
と圧縮ピンとの相互関係を示す一部省略説明図、第7八
図は油道からキャビティに対して樹脂材料を注入した状
態における中子とスリーブと圧縮ピンとの相関関係を示
す説明図、第7B図は油道からの樹脂材料からの注入が
停止された状態におけるスリーブと圧縮ピンとの相関関
係を示す説明図、第7C図はスリーブを退動させた状態
で圧縮ピンをキャビティ方向に進動させた状態の説明図
である。4. Drawings (D@RfLsaF'A Figure 1a is an axial sectional view of a bent tube made of synthetic resin, Figure 1b is a sectional view taken along the line Ib-1b in Figure 1a, Figure 2a is Figure 1a, Fig. 1b is an axial cross-sectional view of a half-split part of a bent pipe, Fig. 2b is a cross-sectional view taken along the line nb-nb of Fig. 2a, and Fig. 3 is a forming process in the case of forming a bent pipe according to the prior art. A cross-sectional view showing the correlation between the mold and the core, FIG. 4 is a longitudinal cross-sectional view of the mold when forming a bent pipe using the present invention, and FIG. A longitudinal cross-sectional view showing a cylinder, a sleeve, and a compression pin that slides inside the sleeve, a partially omitted explanatory view showing the mutual relationship between the sleeve and the compression pin shown in Figure 5, and a seventh Figure 8 is an explanatory diagram showing the correlation between the core, sleeve, and compression pin in a state where resin material is injected into the cavity from the oil pipe, and Figure 7B is a state where injection of resin material from the oil pipe is stopped. FIG. 7C is an explanatory diagram showing the correlation between the sleeve and the compression pin in FIG.
30・・湯道 32・・固定型34・・可動
型 36.38・・凹部40・・キャビティ
42a、42b、段部 44a、44b・・段部4
6・・湯道 48.50.52・・孔部54
a、54b・・凹部
55a、56b・・油圧シリンダ
58・・取付板 60・・室
62・・第1押出板 64・・第2押出板55a、
66b・・押出ロッド
682〜68c・・圧縮ピン
703〜70c・・フランジ部
72a、72b・・シリンダロンド
ア4.76・・支持板体
788〜78c・・スリーブ
SOa〜80c・・フランジ部
82.84.86・・凹部 90・・中子92・・合
成樹脂材料
特許出願人 本田技研工業株式会社
Fig 、1 b30... Runway 32... Fixed type 34... Movable type 36. 38... Recessed part 40... Cavity 42a, 42b, Step part 44a, 44b... Step part 4
6... Runway 48.50.52... Hole 54
a, 54b... Recesses 55a, 56b... Hydraulic cylinder 58... Mounting plate 60... Chamber 62... First extrusion plate 64... Second extrusion plate 55a,
66b...Extrusion rod 682-68c...Compression pin 703-70c...Flange portion 72a, 72b...Cylinder door 4.76...Support plate body 788-78c...Sleeve SOa-80c...Flange portion 82. 84.86... Concavity 90... Core 92... Synthetic resin material patent applicant Honda Motor Co., Ltd. Fig, 1 b
Claims (4)
部に中子を配置し、前記中子を移動自在なピン部材を内
設したスリーブにより保持し、湯道を介して溶融成形材
料を所定圧力下に前記キャビティと前記スリーブとピン
部材との間に画成される室に至るまで注入し、次いで前
記スリーブを中子より離間させ、さらにピン部材を付勢
して前記室内の溶融成形材料をキャビティへ押動し、前
記溶融成形材料が固化して後これを前記固定型並びに可
動型から取り出し、さらに中子を除去して成形品を得る
ことを特徴とする中空成形品の製造方法。(1) A core is placed inside a cavity defined by a fixed mold and a movable mold, the core is held by a sleeve equipped with a movable pin member, and the molten molding material is supplied through a runner. The injection is carried out under a predetermined pressure until it reaches the chamber defined between the cavity, the sleeve, and the pin member, and then the sleeve is separated from the core, and the pin member is further urged to melt and mold the interior of the chamber. A method for producing a hollow molded product, which comprises: pushing a material into a cavity, taking out the molten molding material from the fixed mold and movable mold after it solidifies, and removing a core to obtain a molded product. .
ーブは溶融成形材料の注入時に湯道と反対側の位置にお
いて中子を保持し、ピン部材は前記スリーブがキャビテ
ィを画成する型の面部まで退動した時、室内の溶融成形
材料を押動するよう付勢されることからなる中空成形品
の製造方法。(2) In the method according to claim 1, the sleeve holds the core at a position opposite to the runner during injection of the molten molding material, and the pin member is attached to the mold in which the sleeve defines the cavity. A method for manufacturing a hollow molded product, which comprises biasing the molten molding material in the chamber to push when it retracts to the surface.
部に中子を配設し、前記中子をアクチュエータにより進
退動作するスリーブで支承するよう構成し、一方、前記
スリーブ内部に摺動自在にピン部材を設け、前記スリー
ブとピン部材とにより容積を可変とする室を画成し、ピ
ン部材の付勢により前記室に貯留された溶融材料をキャ
ビティに押動して成形品を得るよう構成することを特徴
とする中空成形品の製造装置。(3) A core is disposed inside a cavity defined by a fixed mold and a movable mold, and the core is supported by a sleeve that moves forward and backward by an actuator, while a sleeve that slides inside the sleeve A pin member is freely provided, a chamber whose volume is variable is defined by the sleeve and the pin member, and the molten material stored in the chamber is pushed into the cavity by the urging force of the pin member to obtain a molded product. A manufacturing device for a hollow molded product, characterized in that it is configured as follows.
ーブとピン部材とは固定型に形成された湯口にキャビテ
ィを介して対設されてなる中空成形品の製造装置。(4) An apparatus for manufacturing a hollow molded product according to claim 3, wherein the sleeve and the pin member are disposed opposite to a sprue formed in a fixed mold via a cavity.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15472784A JPS6132729A (en) | 1984-07-25 | 1984-07-25 | Method and apparatus for preparing hollow molded product |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15472784A JPS6132729A (en) | 1984-07-25 | 1984-07-25 | Method and apparatus for preparing hollow molded product |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6132729A true JPS6132729A (en) | 1986-02-15 |
Family
ID=15590626
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15472784A Pending JPS6132729A (en) | 1984-07-25 | 1984-07-25 | Method and apparatus for preparing hollow molded product |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6132729A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03221423A (en) * | 1990-01-29 | 1991-09-30 | Daikyo Inc | Production of plastic tubular body and structure of mold |
-
1984
- 1984-07-25 JP JP15472784A patent/JPS6132729A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03221423A (en) * | 1990-01-29 | 1991-09-30 | Daikyo Inc | Production of plastic tubular body and structure of mold |
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