JPH0521723B2 - - Google Patents
Info
- Publication number
- JPH0521723B2 JPH0521723B2 JP60075559A JP7555985A JPH0521723B2 JP H0521723 B2 JPH0521723 B2 JP H0521723B2 JP 60075559 A JP60075559 A JP 60075559A JP 7555985 A JP7555985 A JP 7555985A JP H0521723 B2 JPH0521723 B2 JP H0521723B2
- Authority
- JP
- Japan
- Prior art keywords
- gate
- spherical
- tapered
- mandrel
- hole
- 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
- 238000000465 moulding Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000005323 electroforming Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims 1
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910000531 Co alloy Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QXZUUHYBWMWJHK-UHFFFAOYSA-N [Co].[Ni] Chemical compound [Co].[Ni] QXZUUHYBWMWJHK-UHFFFAOYSA-N 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
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】
この発明は成形金型本体に組込まれ、ランナと
キヤビテイとを連通させる成形金型用ゲートブツ
シユの製法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a gate bush for a molding die which is incorporated into a molding die body and communicates a runner with a cavity.
プラスチツク成形品を成形する射出成形用金型
は、一般に第１図に示すように構成されている。
すなわち、１は固定金型で、２は可動金型であ
る。固定金型１にはノズルタツチ３を有するスプ
ル４が設けられ、ランナ５，５と連通している。
また、固定金型１と可動金型２にはキヤビテイ
６，６が形成され、これらキヤビテイ６，６はゲ
ートブツシユ７を介して上記ランナ５に連通して
いる。 An injection mold for molding a plastic molded article is generally constructed as shown in FIG.
That is, 1 is a fixed mold, and 2 is a movable mold. The fixed mold 1 is provided with a sprue 4 having a nozzle touch 3, which communicates with the runners 5,5.
Further, cavities 6, 6 are formed in the fixed mold 1 and the movable mold 2, and these cavities 6, 6 communicate with the runner 5 via a gate bush 7.
そして、上記スプル４のノズルタツチ３に射出
成形機のノズル８を接合し、加熱溶融樹脂を射出
すると、この溶融樹脂はスプル４を介してランナ
５，５に流れ、さらにゲートブツシユ７，７を介
してキヤビテイ６，６に充填されるようになつて
いる。 When the nozzle 8 of an injection molding machine is connected to the nozzle touch 3 of the sprue 4 and the heated molten resin is injected, the molten resin flows through the sprue 4 to the runners 5, 5, and further through the gate bushes 7, 7. The cavities 6, 6 are filled with it.
ところで、上記ゲートブツシユ７にはテーパ孔
９が設けられ、その内周面は平滑できないと抵抗
が大きく溶融樹脂の流動性が阻害され、成形に支
障をきたすことは勿論である。そこで、従来にお
いては、鉄材からなる円柱状のゲートブツシユ材
にその軸方向にドリル加工によつて貫通孔を穿設
し、この貫通孔をテーパリーマによつてテーパ孔
９に仕上げ、さらに、そのテーパ孔９の内周面を
サンドペーパあるいは砥石によつて鏡面仕上げし
ていた。ところが、上記テーパ孔９は一般に数mm
φである。したがつて、ゲートブツシユ材に穿孔
する際にドリルが折れやすく、またテーパリーマ
によつて形成したテーパ孔９の内周面の研摩は手
作業であるため長時間を要し、しかも熟練度が要
求される作業である。 Incidentally, the gate bush 7 is provided with a tapered hole 9, and if the inner circumferential surface of the hole is not smooth, the resistance will be large and the fluidity of the molten resin will be inhibited, which of course will cause problems in molding. Therefore, in the past, a through hole was drilled in the axial direction of a cylindrical gate bushing material made of iron material, this through hole was finished into a tapered hole 9 with a taper reamer, and then the taper hole The inner peripheral surface of 9 was polished to a mirror finish using sandpaper or a grindstone. However, the taper hole 9 is generally several mm wide.
It is φ. Therefore, the drill easily breaks when drilling into the gate bushing material, and polishing the inner peripheral surface of the tapered hole 9 formed by the taper reamer is a manual process that takes a long time and requires great skill. This is a work that requires a lot of effort.
この発明は上記事情に着目してなされたもの
で、その目的とするところは、テーパ孔の機械加
工、研摩作業を要することなく簡単に製造するこ
とができるとともに、寸法精度、平滑度の高い成
形金型用ゲートブツシユの製法を提供しようとす
るものである。 This invention was made in view of the above circumstances, and aims to be able to easily manufacture tapered holes without machining or polishing, and to form moldings with high dimensional accuracy and smoothness. The purpose of this invention is to provide a method for manufacturing a gate bush for a mold.
以下、この発明を図面に示す一実施例にもとづ
いて説明する。第２図Ａ〜Ｄは成形金型用スプル
の製造順序を示すもので、Ａに示す１１はマンド
レルである。このマンドレル１１は円柱状の真ち
ゆう材の基部１２を残して機械加工により先細の
テーパ部１３を形成し、その先端に球状部を形成
したものであり、このテーパ部１３の表面はサン
ドペーパなどにより鏡面仕上げされている。この
マンドレル１１を電極として公知の電鋳法により
上記テーパ部１３の外周にＢに示すように、ニツ
ケルコバルト合金の有底円筒状の電鋳層１４を形
成する。テーパ部１３の外周に所定の肉厚の電鋳
層１４を形成したのち、マンドレル１１を挿入し
たまま切削加工機のチヤツクに上記マンドレル１
１の基部１２をチヤツキングし、電鋳層１４を所
定の外径に切削してゲートブツシユ本体１５を形
成する。つぎに、ゲートブツシユ本体１５からマ
ンドレル１１を抜去（離型）するとＣに示すよう
に、テーパ部１３に対応するテーパ孔１６および
球状部に対応する球状底部が形成される。このテ
ーパ孔１６の内周面はマンドレル１１のテーパ部
１３の表面が予め鏡面仕上げされているため鏡面
となり、研摩加工が不要である。このようにして
得られたゲートブツシユ本体１５の先端部の外壁
に一対の係止穴１７，１７を穿設し、このゲート
ブツシユ本体１５を予め製作された鍔付外筒体１
８に圧入する。この鍔付外筒体１８は鉄材であ
り、その先端部の外壁には上記係止穴１７，１７
に対応するピン孔１９，１９が穿設されている。
したがつて、Ｄに示すように、鍔付外筒体１８に
ゲートブツシユ本体１５を圧入したのちピン孔１
９，１９にピン２０，２０を挿入し、その先端を
係止穴１７，１７に係止することにより抜け止め
される。このため、ゲートブツシユ本体１５と鍔
付外筒体１８とは一体となり、最終的に電鋳層１
４の底部に機械加工によつて細径のノズル孔２１
を穿設する。そして、従来と同様に成形金型に組
み込むことができる。 The present invention will be described below based on an embodiment shown in the drawings. 2A to 2D show the manufacturing order of a sprue for a molding die, and numeral 11 shown in A is a mandrel. This mandrel 11 has a tapered part 13 formed by machining, leaving a base 12 made of cylindrical brass material, and a spherical part is formed at the tip of the mandrel. It has a mirror finish. Using this mandrel 11 as an electrode, a bottomed cylindrical electroformed layer 14 of nickel-cobalt alloy is formed on the outer periphery of the tapered portion 13 as shown in B by a known electroforming method. After forming an electroformed layer 14 of a predetermined thickness on the outer periphery of the tapered portion 13, the mandrel 1 is placed in the chuck of a cutting machine while the mandrel 11 is inserted.
1, and the electroformed layer 14 is cut to a predetermined outer diameter to form the gate bush main body 15. Next, when the mandrel 11 is removed (released) from the gate bush main body 15, a tapered hole 16 corresponding to the tapered portion 13 and a spherical bottom portion corresponding to the spherical portion are formed as shown in C. The inner circumferential surface of this tapered hole 16 has a mirror finish because the surface of the taper portion 13 of the mandrel 11 has been mirror-finished in advance, and no polishing is required. A pair of locking holes 17, 17 are bored in the outer wall of the tip of the gate bush main body 15 obtained in this way, and this gate bush main body 15 is attached to a flanged outer cylinder body 1 prepared in advance.
Press fit into 8. This flanged outer cylindrical body 18 is made of iron material, and the locking holes 17,
Corresponding pin holes 19, 19 are bored.
Therefore, as shown in D, after the gate bush main body 15 is press-fitted into the flanged outer cylinder 18, the pin hole 1 is
The pins 20, 20 are inserted into the holes 9, 19, and their tips are locked in the locking holes 17, 17 to prevent them from coming off. Therefore, the gate bush main body 15 and the flanged outer cylinder body 18 are integrated, and finally the electroformed layer 1
A small diameter nozzle hole 21 is machined at the bottom of 4.
to be drilled. Then, it can be incorporated into a molding die in the same manner as before.
なお、上記一実施例においては電鋳層１４を所
定の外径に切削してゲートブツシユ本体１５と
し、これを鍔付外筒体１８に圧入するようにした
が、ゲートブツシユ本体１５に切削加工によつて
鍔部を形成すれば鍔付外筒体１８は不要となり、
抜け止め用の手段も不要となる。また、上記電鋳
層１４はニツケルコバルト合金であるが、ニツケ
ルでもよい。 In the above embodiment, the electroformed layer 14 is cut to a predetermined outer diameter to form the gate bushing main body 15, which is press-fitted into the flanged outer cylinder 18. If the flange is formed with the flange, the flange-equipped outer cylinder 18 becomes unnecessary.
There is no need for any means to prevent it from coming off. Furthermore, although the electroformed layer 14 is made of a nickel-cobalt alloy, it may also be made of nickel.
この発明は以上説明したように、マンドレルの
テーパ部に電鋳法によつて電鋳層からなるゲート
ブツシユ本体を形成し、このゲートブツシユ本体
からマンドレルを離型してテーパ孔を形成するこ
とにより、従来のようなドリルによる穿孔作業、
テーパ孔の研摩加工が不要となり、しかも電鋳法
により従来の機械加工では得られなかつた平滑な
テーパ孔を得ることができる。したがつて、ゲー
トブツシユの製作に熟練度が要求されず、コスト
ダウンを図ることができる。さらに、上記の製法
で得られたゲートブツシユを成形金型のランナと
キヤビテイとの間に組込んで成形加工を行なつた
場合、そのテーパ孔の内周面が平滑面で、その先
端部に球状底部を有し、さらに球状底部に細径の
ノズル孔が穿設されているため樹脂流動性が極め
てスムーズとなり、さらに絞り作用によつて樹脂
吐出圧力が高くなり、キヤビテイの隅々まで樹脂
が行き渡り、さらに、１台の成形金型に複数のキ
ヤビテイを設けて同一成形品を同時に成形する場
合に圧力が均一となり、バラツキのない品質の高
い成形品を得ることができる。さらに、テーパ孔
が平滑面であることによつて、ゲート部における
樹脂の引掛りがなく、離型性が向上し、成形サイ
クルアツプが図れるために成形作業が従来のほぼ
50％アツプとなるという効果もある。 As explained above, this invention forms a gate bushing body made of an electroformed layer on the tapered part of a mandrel by electroforming, and then releases the mandrel from this gate bushing body to form a tapered hole. Drilling work with drills such as
Polishing of the taper hole is no longer necessary, and the electroforming method can provide a smooth taper hole that cannot be obtained by conventional machining. Therefore, no skill is required to manufacture the gate bushing, and costs can be reduced. Furthermore, when the gate bush obtained by the above manufacturing method is assembled between the runner and cavity of a molding die and molded, the inner peripheral surface of the tapered hole is a smooth surface, and the tip has a spherical shape. Furthermore, the spherical bottom has a small diameter nozzle hole, which makes resin fluidity extremely smooth, and the squeezing action increases the resin discharge pressure, allowing the resin to reach every corner of the cavity. Furthermore, when a single molding die is provided with a plurality of cavities to mold the same molded product at the same time, the pressure becomes uniform, and high-quality molded products without variation can be obtained. Furthermore, since the tapered hole has a smooth surface, the resin does not get caught at the gate, improving mold releasability and increasing the molding cycle, making the molding process almost as easy as before.
It also has the effect of increasing it by 50%.
第１図は従来の成形金型を示す縦断正面図、第
２図Ａ〜Ｄはこの発明の一実施例を示す説明図で
ある。
１１……マンドレル、１３……テーパ部、１４
……電鋳層、１５……ゲートブツシユ本体、１６
……テーパ孔。
FIG. 1 is a longitudinal sectional front view showing a conventional molding die, and FIGS. 2A to 2D are explanatory diagrams showing an embodiment of the present invention. 11... Mandrel, 13... Taper part, 14
... Electroformed layer, 15 ... Gate bushing body, 16
...Tapered hole.
Claims (1)
し、かつそのテーパ部の先端に球状部を有する金
属製のマンドレルの上記球状部を含むテーパ部に
電鋳法によつて電鋳層からなるゲートブツシユ本
体を形成し、このゲートブツシユ本体を上記マン
ドレルから離型し、ゲートブツシユ本体に上記テ
ーパ部に対応する平滑なテーパ孔および上記球状
部に対応する平滑な球状底部を形成し、この球状
底部に上記ゲートブツシユ本体の端面に貫通する
細径のノズル孔を穿設したことを特徴とする成形
金型用ゲートブツシユの製法。1. An electroformed layer is formed by electroforming on the tapered part including the spherical part of a metal mandrel having a tapered part with a smooth surface and a spherical part at the tip of the tapered part. A gate bushing body is formed, the gate bushing body is released from the mandrel, a smooth taper hole corresponding to the tapered part and a smooth spherical bottom part corresponding to the spherical part are formed in the gate bushing body, and the spherical bottom part has the above-mentioned shape. A method for manufacturing a gate bush for a molding die, characterized in that a small diameter nozzle hole is bored through the end face of the gate bush main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7555985A JPS61233515A (en) | 1985-04-10 | 1985-04-10 | Gate bush for mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7555985A JPS61233515A (en) | 1985-04-10 | 1985-04-10 | Gate bush for mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61233515A JPS61233515A (en) | 1986-10-17 |
| JPH0521723B2 true JPH0521723B2 (en) | 1993-03-25 |
Family
ID=13579654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7555985A Granted JPS61233515A (en) | 1985-04-10 | 1985-04-10 | Gate bush for mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61233515A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4813211B2 (en) * | 2006-03-06 | 2011-11-09 | Ｎｔｎ株式会社 | Sliding bearing, motor equipped with the same, and manufacturing method of sliding bearing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59230732A (en) * | 1983-06-13 | 1984-12-25 | Y S Giken Kk | Formation of sprue for molding die |
-
1985
- 1985-04-10 JP JP7555985A patent/JPS61233515A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59230732A (en) * | 1983-06-13 | 1984-12-25 | Y S Giken Kk | Formation of sprue for molding die |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61233515A (en) | 1986-10-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4439621B2 (en) | Thread part split insert manufacturing method | |
| US3756553A (en) | Segmented mold for blower wheels | |
| JP2000043095A5 (en) | ||
| US3767340A (en) | Sprue bushing for a single cavity or center sprued mold | |
| JP2002205316A (en) | Method for producing resin bowling pin and resin bowling pin produced by the method | |
| JPH0521723B2 (en) | ||
| JPS60199622A (en) | Manufacture of resin platen roll | |
| JPS59230732A (en) | Formation of sprue for molding die | |
| JP3913896B2 (en) | Injection molding container and injection mold | |
| US2404671A (en) | Molding process | |
| JP3859037B2 (en) | Injection mold for hollow products | |
| JP2013523497A (en) | Mold tool assembly including a resin retaining mechanism positioned against a stem tip | |
| JP3311685B2 (en) | Molding method and molding die for hollow product | |
| US5416968A (en) | Metal mold for producing wood golf club head and method of producing the club head | |
| JPH0241173Y2 (en) | ||
| JPH1158114A (en) | Center drill and working method for pin point gate using it | |
| JPH0523306Y2 (en) | ||
| JPH04329802A (en) | Molding method for thim walled parts | |
| CN218207687U (en) | Automobile gear pump gear produced by core shaft injection | |
| JPH066294B2 (en) | Mold manufacturing method | |
| CN212948959U (en) | Novel needle valve type hot nozzle structure | |
| CN107030255B (en) | Mould for precision casting wax pressing device | |
| JPS6142447A (en) | Manufacture of simple die | |
| JP3312210B2 (en) | Mold equipment for insert molding | |
| JPH0116583Y2 (en) |