JPH0749211B2 - Injection-molded article having undercut portion and manufacturing method thereof - Google Patents
Injection-molded article having undercut portion and manufacturing method thereofInfo
- Publication number
- JPH0749211B2 JPH0749211B2 JP2255284A JP25528490A JPH0749211B2 JP H0749211 B2 JPH0749211 B2 JP H0749211B2 JP 2255284 A JP2255284 A JP 2255284A JP 25528490 A JP25528490 A JP 25528490A JP H0749211 B2 JPH0749211 B2 JP H0749211B2
- Authority
- JP
- Japan
- Prior art keywords
- undercut portion
- molded product
- injection
- die
- mold
- 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
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
- B29C45/4407—Removing or ejecting moulded articles for undercut articles by flexible movement of undercut portions of the articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- 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、アンダーカット部を有する射出成形品とその
製造方法に関する。TECHNICAL FIELD The present invention relates to an injection-molded article having an undercut portion and a method for producing the same.
《従来の技術》 従来のアンダーカット部を有する成形品の製造方法は、
第３図に示すように油圧シリンダ２によって駆動される
スライド３を備えた固定型１と固定型１のアンギュラピ
ン４に連動するスライドコア５を備えた可動型６とがな
すキャビティに成形材を射出して成形品７が成形されて
いる。この場合、スライド３は固定型１の成形部８の形
状に連続して成形品７のアンダーカット部９を成形する
ための曲面8aを形成している。また、スライドコア５の
成形面は上記スライド３の曲面8aに相対してアンダーカ
ット部９を成形する曲面5aを形成すると共に、閉型時に
はロッキングブロック12によって固定されている。<< Conventional Technology >> The conventional method for manufacturing a molded article having an undercut portion is
As shown in FIG. 3, a molding material is placed in a cavity formed by a fixed die 1 having a slide 3 driven by a hydraulic cylinder 2 and a movable die 6 having a slide core 5 interlocking with an angular pin 4 of the fixed die 1. A molded product 7 is molded by injection. In this case, the slide 3 forms a curved surface 8a for molding the undercut portion 9 of the molded product 7 following the shape of the molding portion 8 of the fixed mold 1. The molding surface of the slide core 5 forms a curved surface 5a for molding the undercut portion 9 in opposition to the curved surface 8a of the slide 3 and is fixed by the locking block 12 when the mold is closed.
成形品７を射出成形した後に、離型するときには、スラ
イド３を引上げて成形品７から離した後に、可動型６を
下降させると、スライドコア５がアンギュラピン４に沿
って矢印の方向に移動すると共に、可動型６に追従して
下降し、可動型６の下降が進むにつれて離型を大きくな
るようになっている。When the molded product 7 is injection-molded and then released, the slide core 5 moves in the direction of the arrow along the angular pin 4 when the slide 3 is pulled up and released from the molded product 7 and then the movable mold 6 is lowered. At the same time, the movable mold 6 is moved down, and the mold release is increased as the movable mold 6 is further lowered.
《発明が解決しようとする課題》 しかしながら、このような複雑な形状の金型の構成にお
いては、金型の加工度が高く、加工の難易度も高いため
金型加工費が高く、またスライド３やアンギュラピン４
などを備えるため金型の強度が弱くなり金型を補強する
必要があったり、金型の耐久性が低下するなどの問題点
があった。<< Problems to be Solved by the Invention >> However, in the structure of the mold having such a complicated shape, the mold processing cost is high because the mold processing degree is high and the processing difficulty is high, and the slide 3 is used. And Angular Pin 4
Therefore, there are problems that the strength of the mold is weakened and the mold needs to be reinforced, and the durability of the mold is reduced.
更に、成形品７の表面にシボ模様などがあると、このシ
ボ面10にスライド３の入れ子線が出て品質上の欠陥にな
るなどの問題点があった。Further, if the surface of the molded product 7 has a texture pattern, there is a problem that a nesting line of the slide 3 appears on the texture surface 10 to cause a quality defect.
本発明は、上記の問題点に着目してなされたものであっ
て、その一の目的とするところは、シボ面に入れ子線の
ないアンダーカット部を有する射出成形品を提供するこ
とにある。The present invention has been made in view of the above problems, and one of the objects thereof is to provide an injection-molded article having an undercut portion without a nest line on a grain surface.
また、本発明の他の目的とするところは、金型の材料費
や加工費を低減し、金型強度も高く、耐久性に富むアン
ダーカット部を有する射出成形品の製造方法を提供する
ことにある。Another object of the present invention is to provide a method of manufacturing an injection-molded article having an undercut portion which has a high mold strength and a high mold strength, which reduces mold material costs and processing costs. It is in.
《課題を解決するための手段》 上記の一の目的を達成するために、本発明のアンダーカ
ット部を有する射出成形品は、アンダーカット部の先端
の外側に鉤形を突出させ、離形時にスライド型と連動し
て前記アンダーカット部と前記成形型との間に間隙を生
じさせる鉤片を設けたことを特徴とする。<< Means for Solving the Problem >> In order to achieve the above-mentioned one object, the injection-molded product having the undercut portion of the present invention has a hook shape protruding to the outside of the tip of the undercut portion, and at the time of release. It is characterized in that a hook piece is provided which interlocks with the slide die and creates a gap between the undercut portion and the forming die.
また、他の目的を達成するために本発明のアンダーカッ
ト部を有する射出成形品の製造方法は、固定型と、可動
型上を摺動するスライド型とにアンダーカット部を形成
し、固定型と可動型、スライドコアとよりなるキャビテ
ィに成形材を射出して成形するようにしたアンダーカッ
ト部を有する射出成形品の製造方法において、スライド
コアの上面にアンダーカット部に連続する段差を設け、
この段差の先端に凹部を設けて、射出成形の後、スライ
ドコアを前記段差と凹部に成形された成形品の鉤片と共
に外側に摺動させて成形品を弾性変形させて成形品のア
ンダーカット部を離型させるようにしたことを特徴とす
る。Further, in order to achieve another object, a method of manufacturing an injection-molded article having an undercut portion of the present invention is such that an undercut portion is formed in a fixed die and a slide die that slides on a movable die. In a method of manufacturing an injection-molded article having an undercut portion, which is formed by injecting a molding material into a cavity composed of a movable mold and a slide core, a step is formed on the upper surface of the slide core, the step being continuous with the undercut portion,
A recess is provided at the tip of this step, and after injection molding, the slide core is slid outward together with the hook piece of the molded product molded in the step and the recess to elastically deform the molded product and undercut the molded product. It is characterized in that the parts are separated.
《作用》 本発明のアンダーカット部を有する射出成形品は、かか
る構成にすることによって、成形品の型離れがよくな
り、シボ面に入れ子線のないアンダーカット部を有する
射出成形品になる。また、本発明のアンダーカット部を
有する射出成形品の製造方法は、射出成形の後には、ス
ライドコアの上面に設けた段差と凹部には成形品のアン
ダーカット部の先端に連続する鉤片が外側へ突出するよ
うになる。射出成形後、スライドコアを外側へ摺動させ
ると、このスライドコアの上面に成形された前記鉤片も
外側へ移動し、成形品のアンダーカット部の先端を外側
へ引張って成形品を弾性変形させ、成形品のアンダーカ
ット部が固定型のアンダーカット部から離型し、可動型
の離型が容易になる。<< Operation >> With such a configuration, the injection-molded product having the undercut portion of the present invention becomes an injection-molded product in which the mold release of the molded product is improved and the undercut portion having no nesting line on the grain surface is provided. Further, in the method for manufacturing an injection-molded product having an undercut portion of the present invention, after injection molding, a step provided on the upper surface of the slide core and a recess have a hook piece continuous with the tip of the undercut portion of the molded product. It comes to project to the outside. When the slide core is slid outward after injection molding, the hook piece formed on the upper surface of the slide core also moves outward, and the tip of the undercut part of the molded product is pulled outward to elastically deform the molded product. As a result, the undercut portion of the molded product is released from the undercut portion of the fixed die, which facilitates the release of the movable die.
従って、固形型にスライドやアンギュラピンなどの複雑
な形状の補助部材を必要としないので、金型の加工度も
低く、加工が容易になると共に、金型の強度や耐久性が
低下することもなく、金型の補強など余分な材料費、加
工費が不要となってコストも低減する。Therefore, since the solid mold does not require an auxiliary member having a complicated shape such as a slide or an angular pin, the mold has a low workability, and the work is easy, and the strength and durability of the mold are deteriorated. No additional material costs such as mold reinforcement and processing costs are required, and costs are reduced.
また、成形品の表面にスライドの入れ子線も出ず品質的
に良好な成形品が得られる。Further, a slide nest line does not appear on the surface of the molded product, and a molded product of good quality can be obtained.
《実施例》 以下、本発明の一実施例を第１図及び第２図に基づいて
説明する。<< Embodiment >> An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
第１図は本発明に係るアンダーカット部を有する射出成
形品と閉型時の金型の断面図であり、第２図は同射出成
形品と離型時の金型の断面図である。FIG. 1 is a cross-sectional view of an injection-molded product having an undercut portion according to the present invention and a mold when the mold is closed, and FIG. 2 is a cross-sectional view of the same injection-molded product and a mold when the mold is released.
図中１は固定型、５はスライドコア、６は固定型、９は
アンダーカット部である。In the figure, 1 is a fixed type, 5 is a slide core, 6 is a fixed type, and 9 is an undercut portion.
固定型１は合せ面1aと成形部８とを備え、この成形部８
の表面は成形品７の表面に沿う形状を保つと共に、全面
にシボ面10を形成している。また、成形部８の一端には
成形品７のアンダーカット部９の形状に沿う曲面8aが形
成されている。The fixed die 1 includes a mating surface 1a and a molding portion 8, and the molding portion 8
The surface of (1) maintains the shape along the surface of the molded product (7), and the textured surface (10) is formed on the entire surface. Further, a curved surface 8a is formed at one end of the molded portion 8 along the shape of the undercut portion 9 of the molded product 7.
可動型６は合せ面6aと成形部11を備え、この成形部11は
成形品７の裏面に沿う形状を保つ。また可動型６にはス
ライドコア５が摺動するスライド面３及びスライド型と
当接する当り面４が形成されている。The movable mold 6 includes a mating surface 6a and a molding portion 11, and the molding portion 11 maintains the shape along the back surface of the molded product 7. Further, the movable die 6 is formed with a slide surface 3 on which the slide core 5 slides and a contact surface 4 that abuts on the slide die.
また、スライドコア５の内側には成形品７のアンダーカ
ット部９の形状に沿う曲面5aが形成されていると共に、
スライドコア５の上面には、この曲面5aに連続して段差
12が設けられており、段差12の先端には凹部13が設けら
れている。また、スライドコア５は油圧シリンダ２によ
って駆動され、可動型６のスライド面３を摺動し、閉型
時には当り面４に当接するようになっている。A curved surface 5a is formed inside the slide core 5 along the shape of the undercut portion 9 of the molded product 7, and
On the upper surface of the slide core 5, a step is continuously formed on the curved surface 5a.
12 is provided, and a recess 13 is provided at the tip of the step 12. The slide core 5 is driven by the hydraulic cylinder 2, slides on the slide surface 3 of the movable die 6, and contacts the contact surface 4 when the die is closed.
次に作用を説明すると、固定型１に対して可動型６を上
昇させて両型の合せ面1a,6aを合せた後に、油圧シリン
ダ２を駆動してスライドコア５を摺動させて、当り面４
に当接させると、全金型が閉型の状態となり、このとき
固定型１と可動型６、スライドコア５の間に成形品７を
射出成形するための所定のキャビティが保たれるように
なる。Next, the operation will be described. After the movable die 6 is raised with respect to the fixed die 1 to bring the mating surfaces 1a and 6a of both dies into alignment with each other, the hydraulic cylinder 2 is driven to slide the slide core 5 to make a hit. Surface 4
When all the molds are brought into contact with each other, the mold is closed, and at this time, a predetermined cavity for injection molding the molded product 7 is maintained between the fixed mold 1, the movable mold 6 and the slide core 5. Become.
次に成形材を所定の注入口から射出すると、前記のキャ
ビティに成形品７が成形されると共に、上記のスライド
コア５の上面の段差12及び凹部13には成形品７のアンダ
ーカット部９に連続した鉤片14が成形される。Next, when the molding material is injected from a predetermined injection port, the molding 7 is molded in the cavity, and the undercut 9 of the molding 7 is formed in the step 12 and the recess 13 on the upper surface of the slide core 5. A continuous hook piece 14 is formed.
射出成形が終了した後に、第２図に示すようにスライド
コア５を矢印Ａの方向に摺動させると、このスライドコ
ア５の上面に成形された前記鉤片14がスライドコア５に
引張られて矢印Ａの方向に移動し、この鉤片14に連続し
た成形品７のアンダーカット部９も矢印Ａの方向に移動
して、アンダーカット部９と固定型１の曲面8aとの間に
間隔が生じる。この間隔を適宜に保つことによって可動
型を下降させたときに成形品７のアンダーカット部９を
固定型１から容易に離型させることが出来る。After the injection molding is completed, when the slide core 5 is slid in the direction of arrow A as shown in FIG. 2, the hook piece 14 formed on the upper surface of the slide core 5 is pulled by the slide core 5. The undercut portion 9 of the molded product 7 which is moved in the direction of the arrow A and is continuous with the hook piece 14 is also moved in the direction of the arrow A, and the gap between the undercut portion 9 and the curved surface 8a of the fixed mold 1 is made. Occurs. By properly maintaining this distance, the undercut portion 9 of the molded product 7 can be easily released from the fixed mold 1 when the movable mold is lowered.
更に、可動型６が下降して、離型が完了すると、前記鉤
片14は弾性により元に位置に復帰し、成形品７は所定の
形状に復元する。Further, when the movable mold 6 descends and the releasing is completed, the hook piece 14 returns to its original position by elasticity, and the molded product 7 is restored to a predetermined shape.
従って、シボ等の模様が付与されたアンダーカット部を
有する成形品の射出成形において、上記の方法によって
シボ面を傷つけることなく品質の良い成形品を得る。Therefore, in injection molding of a molded product having an undercut portion provided with a pattern such as grain, a molded product of good quality can be obtained by the above method without damaging the grain surface.
また、シボ等のないアンダーカット部を有する成形品の
射出成形においても上記の方法によって品質の良い成形
品が得られる。Further, also in the injection molding of a molded product having an undercut portion without a grain or the like, a molded product of good quality can be obtained by the above method.
《発明の効果》 以上説明したように、本発明のアンダーカット部を有す
る射出成形品は、アンダーカット部の先端の外側に鉤形
を突出させ、離形時にスライド型と連動して前記アンダ
ーカット部と前記成形型との間に間隙を生じさせる鉤片
を設けたことを特徴とするから、アンダーカット部を有
する射出成形品を射出成形すると成形品の型離れが良く
なり、シボ面に入れ子線のないアンダーカット部を有す
る射出成形品になる。<< Effects of the Invention >> As described above, the injection-molded product having the undercut portion of the present invention has a hook shape protruding outside the tip of the undercut portion, and the undercut is interlocked with the slide die during mold release. Since a hook piece that creates a gap between the mold and the molding die is provided, injection-molding an injection-molded product having an undercut portion improves the mold release of the molded product and inserts it into the embossed surface. It becomes an injection-molded product having an undercut portion without lines.
また、本発明のアンダーカット部を有する射出成形品の
製造方法は、固定型と、可動型上を摺動するスライド型
とにアンダーカット部を形成し、固定型と可動型、スラ
イドコアとよりなるキャビティに成形材を射出して成形
するようにしたアンダーカット部を有する射出成形品の
製造方法において、スライドコアの上面にアンダーカッ
ト部に連続する段差を設け、この段差の先端に凹部を設
けて、射出成形の後、スライドコアを前記段差と凹部に
成形された成形品の鉤片と共に外側に摺動させて成形品
を弾性変形させて成形品のアンダーカット部を離型させ
るようにしたことを特徴とするから、射出成形の後に
は、スライドコアの上面に設けた段差と凹部には成形品
のアンダーカット部の先端に連続する鉤片が外側へ突出
するようになる。射出成形後、スライドコアを外側へ摺
動させると、このスライドコアの上面に成形された前記
鉤片も外側へ移動し、成形品のアンダーカット部の先端
を外側へ引張って成形品を弾性変形させ、成形品のアン
ダーカット部が固定型のアンダーカット部から離型し、
可動型の離型が容易になる。Further, in the method for producing an injection-molded product having an undercut portion of the present invention, the undercut portion is formed in a fixed die and a slide die that slides on the movable die, and the fixed die, the movable die, and the slide core are In a method of manufacturing an injection-molded product having an undercut portion that is formed by injecting a molding material into a cavity, the step that is continuous with the undercut portion is provided on the upper surface of the slide core, and a recess is provided at the tip of this step. After the injection molding, the slide core is slid outward together with the hook piece of the molded product molded in the step and the recess to elastically deform the molded product and release the undercut portion of the molded product. Therefore, after the injection molding, a hook piece continuing to the tip of the undercut portion of the molded product protrudes outward in the step and the recess provided on the upper surface of the slide core. When the slide core is slid outward after injection molding, the hook piece molded on the upper surface of this slide core also moves outward, and the tip of the undercut part of the molded product is pulled outward to elastically deform the molded product. Then, the undercut part of the molded product is released from the undercut part of the fixed mold,
Release of the movable mold becomes easy.
従って、固定型にスライドやアンギュラピンなどの複雑
な形状の補助部材を必要としないので、金型の加工度も
低く、加工が容易になると共に、金型の強度や耐久性が
低下することもなく、金型の補強など余分な材料費、加
工費が不要となってコストも低減する。Therefore, the fixed mold does not require auxiliary members with complicated shapes such as slides and angular pins, so the mold has a low degree of processing, which facilitates processing and also reduces the strength and durability of the mold. No additional material costs such as mold reinforcement and processing costs are required, and costs are reduced.
また、成形品の表面にスライドの入れ子線も出ず品質的
に良好な成形品が得られる。Further, a slide nest line does not appear on the surface of the molded product, and a molded product of good quality can be obtained.
第１図は本発明に係るアンダーカット部を有する射出成
形品と閉型時の金型の断面図、第２図は同射出成形品と
離型時の金型の断面図、第３図は従来の射出成形品と閉
型時の金型の断面図である。 １……固定型、５……スライドコア、６……可動型、７
……成形品、９……アンダーカット部、13……凹部、14
……鉤片。FIG. 1 is a cross-sectional view of an injection-molded product having an undercut portion according to the present invention and a mold when the mold is closed, FIG. 2 is a cross-sectional view of the same injection-molded product and a mold when the mold is released, and FIG. It is sectional drawing of the conventional injection molded product and the metal mold | die at the time of mold closing. 1 ... Fixed type, 5 ... Slide core, 6 ... Movable type, 7
…… Molded product, 9 …… Undercut part, 13 …… Recessed part, 14
...... Hook piece.
Claims (2)
型、スライド型とからなる成形型によって成形される射
出成形品であって、アンダーカット部の先端の外側に鉤
形を突出させ、離形時にスライド型と連動して前記アン
ダーカット部と前記成形型との間に間隙を生じさせる鉤
片を設けたことを特徴とするアンダーカット部を有する
射出成形品。1. An injection-molded article having an undercut portion, which is molded by a molding die including a fixed die, a movable die, and a slide die, wherein a hook shape is projected outside the tip of the undercut portion. An injection-molded article having an undercut portion, characterized in that a hook piece is provided which interlocks with a slide die to form a gap between the undercut portion and the molding die at the time of releasing.
とにアンダーカット部を形成し、固定型と可動型、スラ
イドコアとよりなるキャビティに成形材を射出して成形
するようにしたアンダーカット部を有する射出成形品の
製造方法において、スライドコアの上面にアンダーカッ
ト部に連続する段差を設け、この段差の先端に凹部を設
けて、射出成形の後、スライドコアを前記段差と凹部に
成形された成形品の鉤片と共に外側に摺動させて成形品
を弾性変形させて成形品のアンダーカット部を離形させ
るようにしたことを特徴とするアンダーカット部を有す
る射出成形品の製造方法。2. An undercut portion is formed in a fixed die and a slide die that slides on the movable die, and a molding material is injected into a cavity composed of the fixed die, the movable die, and the slide core to perform molding. In the method for producing an injection-molded article having an undercut portion, a step which is continuous with the undercut section is provided on the upper surface of the slide core, and a recess is provided at the tip of this step. An injection-molded product having an undercut portion, characterized in that the undercut portion of the molded product is released by sliding outwardly together with the hook piece of the molded product molded in the recess to elastically deform the molded product. Manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2255284A JPH0749211B2 (en) | 1990-09-27 | 1990-09-27 | Injection-molded article having undercut portion and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2255284A JPH0749211B2 (en) | 1990-09-27 | 1990-09-27 | Injection-molded article having undercut portion and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04135726A JPH04135726A (en) | 1992-05-11 |
| JPH0749211B2 true JPH0749211B2 (en) | 1995-05-31 |
Family
ID=17276622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2255284A Expired - Lifetime JPH0749211B2 (en) | 1990-09-27 | 1990-09-27 | Injection-molded article having undercut portion and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0749211B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5427520A (en) * | 1992-01-31 | 1995-06-27 | Sony Corporation | Mold device for fabricating disc substrate |
| BRPI0622017A2 (en) | 2006-11-08 | 2011-12-20 | Michelin Rech Et Techinique S A | method for automatically demolding a curved tread, automated device for removing a cured tread from a mold and mold for a tread |
| JP5878108B2 (en) * | 2012-11-22 | 2016-03-08 | 小島プレス工業株式会社 | Method for molding the console door skin |
| WO2017104555A1 (en) * | 2015-12-16 | 2017-06-22 | ニチアス株式会社 | Water jacket spacer manufacturing method and water jacket spacer |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5314693Y2 (en) * | 1973-11-12 | 1978-04-18 | ||
| JPS5516659Y2 (en) * | 1974-06-26 | 1980-04-18 | ||
| JPS5624226U (en) * | 1979-07-31 | 1981-03-05 | ||
| JPS63249612A (en) * | 1987-04-06 | 1988-10-17 | Mazda Motor Corp | Method for molding synthetic resin molded article |
-
1990
- 1990-09-27 JP JP2255284A patent/JPH0749211B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04135726A (en) | 1992-05-11 |
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