JPS6082318A - Method of injection molding - Google Patents
Method of injection moldingInfo
- Publication number
- JPS6082318A JPS6082318A JP19187383A JP19187383A JPS6082318A JP S6082318 A JPS6082318 A JP S6082318A JP 19187383 A JP19187383 A JP 19187383A JP 19187383 A JP19187383 A JP 19187383A JP S6082318 A JPS6082318 A JP S6082318A
- Authority
- JP
- Japan
- Prior art keywords
- undercut
- molding
- working section
- mold
- product
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/52—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles soluble or fusible
-
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
- B29C45/4457—Removing or ejecting moulded articles for undercut articles using fusible, soluble or destructible cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、アンダーカット部を有する合成樹脂製品の射
出成形方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of injection molding a synthetic resin product having an undercut portion.
第1図(alは、床トラップを断面図で示したもので、
1は本体、2は開口、”3は流路口、4は側孔5は流体
ガイド、6は接続部である。Figure 1 (al is a cross-sectional view of the floor trap;
1 is a main body, 2 is an opening, 3 is a flow path opening, 4 is a side hole 5 is a fluid guide, and 6 is a connecting portion.
この床トラップの場合、流体ガイド5と流路口3で囲ま
れるトラップ部Xが射出成形上のアンダーカットとなり
、該アンダーカット部は複雑であるので、射出成形法に
よる合成樹脂製のものは見当たらない。In the case of this floor trap, the trap part X surrounded by the fluid guide 5 and the flow path opening 3 becomes an undercut in injection molding, and since the undercut part is complicated, there is no one made of synthetic resin made by injection molding. .
本発明は、上記のような複雑なアンダーカットを有する
製品をも高い金型費用をかけることなく容易に成形する
ことが可能な射出成形方法を提供することを目的とする
もので、アンダーカット処理部を化学的もしくは物理的
に形状崩壊可能に予め鋳型成形し、これを成形金型に離
脱可能に装着して製品形状のキャビティを金型内に形成
セしめるにあたり、成形金型の上記アンダーカット処理
部の非成形面と対接する非成形面の一部もしくは全部に
アンダーカット処理部の成形誤差を吸収する為の弾性体
を装着し、射出成形後に上記アンダーカット処理部を物
理的もしくは化学的処理により製品内から排除すること
を特徴とする。An object of the present invention is to provide an injection molding method that can easily mold products with complex undercuts as described above without incurring high mold costs. The above-mentioned undercut of the mold is used to form a product-shaped cavity in the mold by pre-molding the part into a mold so that its shape can be broken down chemically or physically, and attaching it to the mold in a removable manner. An elastic body is attached to part or all of the non-molded surface that is in contact with the non-molded surface of the treated area to absorb molding errors in the undercut treated area, and the undercut treated area is physically or chemically removed after injection molding. It is characterized by being removed from the product through processing.
以下、本発明の一実施例を図面を参照して説明する。Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第2図において、10は固定側型板、20は可動側型板
、30はコア、40はスライドコア、50はアダーカッ
ト処理部であって、これらの成形面により製品(第1図
(a)の床トラップ)の形状を持つキャビティが形成さ
れる。アンダーカット処理部50は、コア30の成形面
との間に流体ガイド5を成形する為のキャビティを形成
する成形面51、固定側型板10及び可動側型板20の
成形面との間に床トランプ本体1の開口2側から見て流
体ガイド5で覆われる壁部分及び流路口3を成形する為
のキャビティを形成する成形面52を具えた前記第1図
fatのアンダーカット部Xの形状を具える複雑形状(
第1図(a)の斜線部分に対応する)の入れ子である。In Fig. 2, 10 is a stationary template, 20 is a movable template, 30 is a core, 40 is a slide core, and 50 is an adder cut processing section. A cavity with the shape of a floor trap) is formed. The undercut processing section 50 has a molding surface 51 that forms a cavity for molding the fluid guide 5 between the molding surface of the core 30 and the molding surfaces of the fixed mold plate 10 and the movable mold plate 20. The shape of the undercut portion X shown in FIG. A complex shape with (
This corresponds to the shaded area in FIG. 1(a)).
このアンダーカット処理部50は、可動型板20に植設
され開型方向に突出して伸びる係止ピン70に離型可能
に係止されている。なお、アンダーカット処理部50を
可動側型板20に係止する手段として係止ピンを用いる
他、接着剤で仮接着し、この仮接着面が成形後の型開き
時に離れるようにしても良い。The undercut processing portion 50 is removably locked to a locking pin 70 that is implanted in the movable mold plate 20 and extends in the mold opening direction. In addition to using a locking pin as a means for locking the undercut processing portion 50 to the movable template 20, it may also be temporarily bonded with an adhesive so that this temporary bonded surface is separated when the mold is opened after molding. .
60.61はパリ防止用の弾性体シートであって、弾性
体シート60はアンダーカット処理部50の非成形面5
3と嵌合対接するコア30の非成形面31に貼着されて
いる。コア3の該非成形面31に連続する非成形面部分
32はアンダーカット処理部50が樹脂圧により強く押
されて圧接するので、弾性シートは不要である。弾性体
シート61はアンダーカット処理部50の非成形面54
と対接するスライドコア40の非成形面41に貼着され
ている。なお、弾性体シート60.61は貼着以外のピ
ン止め等により固着されても良い。Reference numeral 60 and 61 are elastic sheets for preventing paris, and the elastic sheet 60 is the non-forming surface 5 of the undercut processing portion 50.
It is attached to the non-molded surface 31 of the core 30 that fits and contacts the core 30. Since the undercut portion 50 is strongly pressed by the resin pressure and comes into pressure contact with the non-molded surface portion 32 of the core 3 that is continuous with the non-molded surface 31, an elastic sheet is not necessary. The elastic sheet 61 is attached to the non-molding surface 54 of the undercut treatment section 50.
It is attached to the non-molding surface 41 of the slide core 40 that is in contact with the slide core 40 . Note that the elastic sheets 60 and 61 may be fixed by pinning or the like other than adhesion.
上記成形面51.52を具えるアンダーカット処理部5
0ば、物理的もしくは化学的に形状喪失もしくは形状崩
壊容易な、例えば、セラミックスの如き耐熱性を有する
脆弱物質や砂をフェノール樹脂で固めて焼結したもの、
あるいは砂を水溶性接着剤で固めたものであって、第3
図に示す如く簡便な鋳型100を用いて予め成形される
。第3図において、55はビン孔であって、床トラップ
の側孔4対応する部分に形成される。Undercut processing section 5 comprising the above-mentioned molding surfaces 51 and 52
For example, materials that easily lose or collapse their shape physically or chemically, such as heat-resistant brittle materials such as ceramics or sand, hardened with phenol resin and sintered;
Alternatively, sand is hardened with a water-soluble adhesive, and the third
As shown in the figure, it is preformed using a simple mold 100. In FIG. 3, a bottle hole 55 is formed in a portion corresponding to the side hole 4 of the floor trap.
80は製品突出しビン、81はスプルーである。80 is a product ejection bin, and 81 is a sprue.
第1図+a)の床トラップを射出成形するに当たっては
、アンダーカット処理部50を可動型板20にビン係止
して金型に装着し、型閉じする。これにより、金型内に
は床I・ラップの形状を持つキャビティが形成される。In injection molding the floor trap shown in FIG. 1+a), the undercut treatment section 50 is pin-locked to the movable mold plate 20, attached to the mold, and the mold is closed. As a result, a cavity having the shape of a floor I/lap is formed in the mold.
次いで、溶融樹脂をスプルー81を通して該キャビティ
に射出・注入し、所定時間後に型開きし、突出しピン8
0を移動させて成形された床I・ラップを金型から取出
す。この時、係止ピン70は製品突出し方向に向いてい
るあで、成形品である床トラップはアンダー力・ノド処
理部50を内蔵したまま引っ掛かることなく金型から離
脱する。金型から取出したのち、床トラップ内に残って
いるアンダーカット処理部50を、これがセラミックス
の如き耐熱性を有する脆弱物質や砂をフェノール樹脂で
固めて焼結したものである場合にはドライバー等を用い
て外部から崩壊せしめて、また砂を水溶性接着剤で固め
たものである場合は水に漬けて床トラップから排除する
。Next, molten resin is injected into the cavity through the sprue 81, the mold is opened after a predetermined period of time, and the ejecting pin 8
0 and take out the molded floor I/wrap from the mold. At this time, the locking pin 70 is oriented in the product ejection direction, and the floor trap, which is a molded product, is removed from the mold without being caught, with the under force/throat processing section 50 built-in. After being removed from the mold, the undercut portion 50 remaining in the floor trap is removed using a screwdriver, etc. if the undercut portion 50 is made of a heat-resistant brittle material such as ceramics or sand hardened with phenol resin and sintered. If the sand is hardened with a water-soluble adhesive, soak it in water and remove it from the floor trap.
アンダーカット処理部50は、上記のように簡便な手段
で作られる為、成形誤差があり、そのままでは、その非
成形面53.54とコア30やスライドコア40等の非
成形面との対接部分に間隙ができ、パリが発生しやすい
が、本実施例では、金型の非成形面53.54に弾性シ
ート60.61を貼着して該弾性体シートより上記成形
誤差を吸収さゼているので、パリの発生は充分防止され
る。Since the undercut processing portion 50 is made by a simple method as described above, there is a molding error, and if left as it is, the non-molded surfaces 53, 54 and the non-molded surfaces of the core 30, slide core 40, etc. However, in this embodiment, elastic sheets 60 and 61 are attached to the non-molding surfaces 53 and 54 of the mold to absorb the above-mentioned molding errors. Therefore, the occurrence of Paris is sufficiently prevented.
第4図は本発明により第1図(b)に示す管継手を成形
する場合の実施例を示したものである。この管継手では
3個所にある止水材用溝6.7.8と分岐部9とがアン
ダーカット部となる。本実施例では、止水材用溝6.7
.8は、これらの溝形状を持つ入れ子106.107.
108を第2図の入れ子50の場合と同様に形状崩壊容
易に鋳型成形し、これをアンダーカット処理部としてそ
れぞれコア300、スライドコア400.400に嵌合
装着して成形する。尚、それぞれのコア300、スライ
ドコア400.400の根元側を段付1061.107
1.1081として位置決めすると共にその部分に弾性
体シート65.66.67を貼着しておく。また、分岐
部9はその内面に沿う成形面を持つ入れ子109を形状
崩壊可能に鋳型成形し、これをアンダーカット処理部と
してコア300に挿脱容易に装着する。入れ子109の
符号Aで示ず側にはコア300から円周数箇所に配置さ
れて突出するピン56が遊嵌するビン孔を設け、このビ
ン孔をピン56.56に挿入することにより装着する。FIG. 4 shows an example of molding the pipe joint shown in FIG. 1(b) according to the present invention. In this pipe joint, the three water stopper grooves 6, 7, and 8 and the branch portion 9 serve as undercut portions. In this example, the water stop material groove 6.7
.. 8 are nests 106, 107, . . . having these groove shapes.
108 is molded so as to easily collapse its shape as in the case of the insert 50 shown in FIG. 2, and is fitted and molded into the core 300 and the slide core 400 and 400, respectively, as an undercut portion. In addition, the base side of each core 300 and slide core 400.400 is stepped 1061.107.
1.1081, and an elastic sheet 65, 66, 67 is attached to that part. Further, the branch part 9 is molded with a nest 109 having a molding surface along its inner surface so that its shape can be collapsed, and this is easily inserted into and removed from the core 300 as an undercut part. On the side of the nest 109 not indicated by reference numeral A, there are provided pin holes into which pins 56 protruding from the core 300 are loosely fitted, and the pins 56 and 56 are inserted into the pin holes to attach the pins 56 and 56. .
この場合、弾性体シート63.64はコア300、スラ
イドコア400のA面、B面に貼着する。このように弾
性体シート6−3を貼着しておけば、弾性体シート63
0弾力により符号Aで示ずコア300と入れ子109と
の対接面は圧接状になるので、パリの発生は防止される
。また、スライドコア400の入れ子109の嵌合面に
弾性体シー1−64を貼着しておけば、符号Bで示す部
分でのパリを防止することができる。In this case, the elastic sheets 63 and 64 are attached to the A side and B side of the core 300 and slide core 400. If the elastic sheet 6-3 is attached in this way, the elastic sheet 63
Due to the zero elasticity, the contact surfaces of the core 300 and the nest 109 (noted by reference numeral A) are pressed into contact with each other, so that the occurrence of cracks is prevented. Moreover, if the elastic sheet 1-64 is attached to the fitting surface of the insert 109 of the slide core 400, it is possible to prevent the part indicated by the symbol B from breaking.
以上の如く、本発明によれば、製品の成形に当たって、
アンダーカット処理部を物理的処理もしくは化学的処理
により形状崩壊容易な物質で成形し、これを金型内に接
着もしくはピン係止等の手段で装着して製品形状のキャ
ビティを金型内に形成せしめたことにより、複雑な形状
を持つアンダーカット製品の射出成形を容易にし、また
アンダーカット処理部の必要部分には弾性体を貼着して
上記アンダーカット処理部の成形誤差を吸収するよ、う
にしたので、アンダーカット処理部の成形に高精度を要
せず、簡便な手段で済むので大きな費用をかげることな
く上記効果を得ることができる。As described above, according to the present invention, when molding a product,
The undercut processing part is molded with a substance whose shape easily collapses through physical or chemical processing, and this is attached to the mold by means such as gluing or locking with pins to form a cavity in the shape of the product inside the mold. This makes injection molding of undercut products with complicated shapes easier, and elastic bodies are attached to necessary parts of the undercut treatment area to absorb molding errors in the undercut treatment area. As a result, high precision is not required for forming the undercut portion, and a simple method is sufficient, so that the above effects can be obtained without incurring large costs.
第1図(B)、(blは本発明方法により成形される製
品例であって、(a)は合成樹脂製床トラップの縦断面
図、(blは合成樹脂製管継手の縦断面図、第2図は本
発明の射出成形方法を実施する為の成形金型の横断面図
、第3図は上記成形金型におけるアンダーカット処理部
を成形する鋳型の断面図、第4図は本発明の他の実施例
を説明する為の成形金型の横断面図である。
10−固定側型板、20可動側型板、30.300−−
・コア、40.400.−’−スライドコア、50.1
09−アンダーカット処理部、51.52−・−成形面
、53.54−非成形面、55−ビン孔、60〜67−
弾性体シート。
特許出願人
東部積水株式会社FIG. 1(B), (bl is an example of a product molded by the method of the present invention, (a) is a vertical cross-sectional view of a synthetic resin floor trap, (bl is a vertical cross-sectional view of a synthetic resin pipe joint, FIG. 2 is a cross-sectional view of a mold for carrying out the injection molding method of the present invention, FIG. 3 is a cross-sectional view of a mold for forming an undercut portion in the mold, and FIG. 4 is a cross-sectional view of a mold according to the present invention. It is a cross-sectional view of a molding die for explaining another example. 10-fixed side template, 20 movable side template, 30.300--
・Core, 40.400. -'-Slide core, 50.1
09-undercut processing part, 51.52--molding surface, 53.54-non-molding surface, 55-bottle hole, 60-67-
Elastic sheet. Patent applicant Tobu Sekisui Co., Ltd.
Claims (1)
において、成形金型の上記アンダーカット処理部を化学
的もしくは物理的に形状崩壊可能に予め鋳型成形し、該
鋳型成形したアンダーカット処理部を上記成形金型に離
脱可能に装着するにあたり、該成形金型の上記アンダー
カット処理部の非成形面と対接する非成形面の一部もし
くは全部に弾性体を装着して上記アンダーカット処理部
の成形誤差を吸収させ、上記製品の射出成形・冷却後該
製品がら上記鋳型成形したアンダーカット処理部を化学
的もしくは物理的処理により排除することを特徴とする
射出成形方法。1. When injection molding a product with an undercut, the undercut treated part of the molding die is molded in advance so that its shape can be collapsed chemically or physically, and the molded undercut treated part is molded into the molded part. When removably attached to the mold, an elastic body is attached to a part or all of the non-molding surface of the mold that is in contact with the non-molding surface of the undercut treated portion to prevent molding errors in the undercut treated portion. An injection molding method, which comprises: absorbing the above-mentioned product, and after injection molding and cooling of the product, removing the above-mentioned molded undercut portion from the product by chemical or physical treatment.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19187383A JPS6082318A (en) | 1983-10-13 | 1983-10-13 | Method of injection molding |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19187383A JPS6082318A (en) | 1983-10-13 | 1983-10-13 | Method of injection molding |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6082318A true JPS6082318A (en) | 1985-05-10 |
Family
ID=16281891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19187383A Pending JPS6082318A (en) | 1983-10-13 | 1983-10-13 | Method of injection molding |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6082318A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5190349A (en) * | 1975-02-06 | 1976-08-07 | JUSHIIKOMYONAKAGO |
-
1983
- 1983-10-13 JP JP19187383A patent/JPS6082318A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5190349A (en) * | 1975-02-06 | 1976-08-07 | JUSHIIKOMYONAKAGO |
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