JPH0337936Y2 - - Google Patents
Info
- Publication number
- JPH0337936Y2 JPH0337936Y2 JP1983146648U JP14664883U JPH0337936Y2 JP H0337936 Y2 JPH0337936 Y2 JP H0337936Y2 JP 1983146648 U JP1983146648 U JP 1983146648U JP 14664883 U JP14664883 U JP 14664883U JP H0337936 Y2 JPH0337936 Y2 JP H0337936Y2
- Authority
- JP
- Japan
- Prior art keywords
- mandrel
- die
- extrusion
- die hole
- 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
Links
- 238000001125 extrusion Methods 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 12
- 230000004323 axial length Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Description
【考案の詳細な説明】
この考案は円形管成形用の押出成形機の金型に
関する。[Detailed Description of the Invention] This invention relates to a mold for an extrusion molding machine for forming circular tubes.
従来、この種金型には成形される円形管に偏肉
の生じないよう次のように構成される場合があ
る。 Conventionally, this type of mold has been constructed as follows in order to prevent uneven thickness of the circular tube to be molded.
即ち、金型本体にダイスが設けられ、このダイ
スにダイス孔が形成され、このダイス孔内にマン
ドレルが配置される。このマンドレルは、このマ
ンドレルに形成されたフランジを金型本体にねじ
止めすることで固着される。そして、このダイス
とマンドレルの成形品押出方向前部との間の環状
間隙が円形管の押出成形部とされる。また、ダイ
ス孔内周面とマンドレル後部の接合部から押出成
形部の中途部にわたりダイス孔軸回りの螺旋通路
が形成され、この螺旋通路が、押出機本体から加
圧されて供給される被成形材を上記押出成形部に
案内するよう形成される。 That is, a die is provided in the mold body, a die hole is formed in the die, and a mandrel is placed in the die hole. This mandrel is fixed by screwing a flange formed on the mandrel to the mold body. The annular gap between this die and the front part of the mandrel in the direction of extrusion of the molded product becomes the extrusion molded part of the circular tube. In addition, a spiral passage around the axis of the die hole is formed from the joint between the inner circumferential surface of the die hole and the rear part of the mandrel to the middle part of the extrusion molding part, and this spiral passage is connected to the molded material that is supplied under pressure from the extruder main body. shaped to guide material into the extrusion.
そして、被成形材が螺旋通路を移動しながら押
出成形部に供給されることによつて、押出成形部
における被成形材の周方向各部圧力が均一化さ
れ、この圧力の均一化によつて、円形管の偏肉の
発生が抑制される。 By supplying the material to be formed to the extrusion molding section while moving through the spiral path, the pressure at each part in the circumferential direction of the material to be formed in the extrusion molding section is equalized, and by this equalization of pressure, The occurrence of uneven thickness in circular pipes is suppressed.
ところで上記構成において、押出成形部での被
成形材の周方向各部圧力を均一化するためには、
螺旋通路をある程度長く採る必要があり、そのた
め、ダイスとマンドレルの軸方向長さが長くなる
傾向を生じる。しかも、マンドレルは上記したよ
うにフランジなどで金型本体に固着されているた
め、この固着手段により金型の軸方向長さは更に
大となる。 By the way, in the above configuration, in order to equalize the pressure at each part in the circumferential direction of the material to be formed in the extrusion molding part,
It is necessary to take a somewhat long spiral path, which tends to increase the axial length of the die and mandrel. Moreover, since the mandrel is fixed to the mold body by a flange or the like as described above, the length of the mold in the axial direction is further increased by this fixing means.
この考案は、上記のような事情に注目してなさ
れたもので、成形される円形管の偏肉の生じるこ
とを抑制すると共に、金型の軸方向長さを短縮し
て金型をコンパクトに構成することを目的とす
る。 This idea was developed in view of the above-mentioned circumstances. It suppresses uneven thickness of the circular tube being molded, and also shortens the axial length of the mold to make it more compact. The purpose is to configure.
上記目的を達成するためのこの考案の特徴とす
るところは、ダイスのダイス孔内にマンドレルを
配置し、上記ダイス孔の成形品押出方向後部にマ
ンドレルの後部をテーパ嵌合により支持させ、同
上ダイス孔とマンドレルの各前部間の環状間隙を
円形管の押出成形部とし、上記マンドレルを複数
の筒体を互いに嵌め合わせた多重構造にしてこれ
ら各筒体の後部同士をテーパ嵌合により互いに連
結し、上記各テーパ嵌合部に被成形材料を通過さ
せる螺旋通路を形成してこれら各螺旋通路を上記
押出成形部に連通させた点にある。 The feature of this invention for achieving the above object is that a mandrel is arranged in the die hole of the die, and the rear part of the mandrel is supported by tapered fitting at the rear part of the die hole in the direction of extrusion of the molded product. The annular gap between the hole and each front part of the mandrel is an extrusion molded part of a circular tube, and the mandrel has a multilayer structure in which a plurality of cylindrical bodies are fitted into each other, and the rear parts of these cylindrical bodies are connected to each other by tapered fitting. The present invention is characterized in that spiral passages through which the material to be molded passes are formed in each of the tapered fitting parts, and these spiral passages are communicated with the extrusion molding part.
以下、この考案の実施例を図面により説明す
る。 Examples of this invention will be described below with reference to the drawings.
１は押出成形機の金型であり、この金型１は、
押出成形機本体３により加熱かつ加圧されて供給
される樹脂などの被成形材を多重円形管２に押出
成形するものである。なお、この金型１による成
形品押出方向の前方は、図に向つて左の方向であ
る。 1 is a mold of an extrusion molding machine, and this mold 1 is
A material to be molded, such as a resin, which is heated and pressurized and supplied by an extrusion molding machine main body 3, is extruded into multiple circular tubes 2. Note that the forward direction in the direction of extrusion of the molded product by this mold 1 is the left direction as viewed in the figure.
上記金型１はダイス４を有し、このダイス４に
はダイス孔６が形成され、このダイス孔６内にマ
ンドレル７が配置される。このマンドレル７の成
形品押出方向後部がテーパ形状とされてダイス孔
６の軸心上でダイス孔６後部に形成されたテーパ
部６ａにテーパ嵌合してダイス４に支持されてい
る。 The mold 1 has a die 4, a die hole 6 is formed in the die 4, and a mandrel 7 is disposed within the die hole 6. The rear part of the mandrel 7 in the extrusion direction of the molded product is tapered and is supported by the die 4 by being tapered fit into a tapered part 6a formed at the rear of the die hole 6 on the axis of the die hole 6.
上記マンドレル７は複数の筒体を互いに嵌め合
わせた多重構造であつて、筒体たるマンドレル主
体８と、このマンドレル主体８にテーパ嵌合する
截頭円錐状の第１筒体９と、この第１筒体９にテ
ーパ嵌合する第１筒体９と同形状の第２筒体１０
とを有している。そして、マンドレル主体８と第
１筒体９との環状間隙が円形管２の内側部円筒管
を成形する内側押出成形部１２とされ、第１筒体
９と第２筒体１０との環状間隙が同中間部円筒管
を成形する中間押出成形部１３とされ、かつ、第
２筒体１０とダイス４との環状間隙が同外側部円
筒管を成形する外側押出成形部１４とされてい
る。また、マンドレル主体８前端部とダイス４と
の環状間隙が上記内側、中間、外側部の各円筒管
を重ね合わせて円形管２に成形する重合押出成形
部１６とされる。 The mandrel 7 has a multi-layered structure in which a plurality of cylindrical bodies are fitted into each other, and includes a mandrel main body 8 which is a cylindrical body, a truncated conical first cylinder 9 which taper-fits to this mandrel main body 8, and this first cylindrical body 9. A second cylindrical body 10 having the same shape as the first cylindrical body 9 taper-fitted to the first cylindrical body 9
It has The annular gap between the mandrel main body 8 and the first cylindrical body 9 serves as an inner extrusion molded part 12 for forming the inner cylindrical tube of the circular tube 2, and the annular gap between the first cylindrical body 9 and the second cylindrical body 10 is an intermediate extrusion molding section 13 for forming the intermediate cylindrical tube, and an annular gap between the second cylindrical body 10 and the die 4 is an outer extrusion molding section 14 for forming the outer cylindrical tube. Further, the annular gap between the front end of the mandrel main body 8 and the die 4 serves as a superposition extrusion molding section 16 in which the inner, middle, and outer cylindrical tubes are overlapped to form the circular tube 2.
上記ダイス孔６内周面とマンドレル７との間に
ダイス孔６軸回りの第１螺旋通路１７が形成さ
れ、また、マンドレル主体８と第１筒体９との
間、および第１筒体９と第２筒体１０との間に第
２、第３螺旋通路１８，１９が形成される。これ
ら螺旋通路１７，１８，１９は、加圧されて供給
される被成形材を上記内側、中間、外側押出成形
部１２，１３，１４に案内するように形成され、
それぞれテーパ嵌合した嵌合部から各押出成形部
１２，１３，１４の中途部にわたり形成されてい
る。 A first spiral passage 17 around the axis of the die hole 6 is formed between the inner circumferential surface of the die hole 6 and the mandrel 7, and between the mandrel main body 8 and the first cylindrical body 9, Second and third spiral passages 18 and 19 are formed between the second cylindrical body 10 and the second cylindrical body 10 . These spiral passages 17, 18, 19 are formed so as to guide the pressurized and supplied molded material to the inner, intermediate, and outer extrusion molding parts 12, 13, 14,
The extruded portions 12, 13, and 14 are formed from the tapered fitting portions to the middle portions of the extruded portions 12, 13, and 14, respectively.
そして、被成形材がこの螺旋通路１７，１８，
１９を通過することで各押出成形部１２，１３，
１４におけるこの被成形材の周方向各部の圧力が
均一化される。 Then, the material to be formed passes through these spiral passages 17, 18,
By passing through 19, each extrusion molded part 12, 13,
The pressure at each part in the circumferential direction of the material to be formed at 14 is made uniform.
この考案によれば、ダイス孔の成形品押出方向
後部にマンドレルの後部をテーパ嵌合により支持
させ、同上ダイス孔とマンドレルの各前部間の環
状間隙を円形管の押出成形部とし、上記マンドレ
ルを複数の筒体を互いに嵌め合わせた多重構造に
してこれら各筒体の後部同士をテーパ嵌合により
互いに連結し、上記各テーパ嵌合部に螺旋通路を
形成してこれら各螺旋通路を上記押出成形部に連
通させたため、押出成形時に金型における被成形
材料の圧力を均一にさせる螺旋通路が、ダイスに
マンドレルを支持させたり、このマンドレルの筒
体同士を連結させたりするための各テーパ嵌合部
を利用して成形されることとなる。 According to this invention, the rear part of the mandrel is supported by tapered fitting at the rear part of the die hole in the extrusion direction of the molded product, and the annular gap between the die hole and each front part of the mandrel is used as the extrusion molded part of the circular tube. is made into a multiple structure in which a plurality of cylindrical bodies are fitted into each other, and the rear parts of these cylindrical bodies are connected to each other by taper fitting, a spiral passage is formed in each of the taper fitting parts, and each of these spiral passages is extruded as described above. Because it communicates with the molding part, the spiral passage that equalizes the pressure of the material to be molded in the mold during extrusion molding is connected to each taper fitting that supports the mandrel on the die and connects the cylindrical bodies of this mandrel. It will be molded using the joint.
よつて、マンドレルの支持部と、螺旋通路とが
成形品押出方向に並設されていた従来に比べて、
この金型の成形品押出方向における長さを短くで
き、この結果、この金型がコンパクトとなる。 Therefore, compared to the conventional method in which the support part of the mandrel and the spiral passage were arranged side by side in the extrusion direction of the molded product,
The length of this mold in the molded product extrusion direction can be shortened, and as a result, this mold can be made compact.
しかも、この場合、各テーパ嵌合部において互
いに嵌合した両者は大きい面積で面接触するもの
であるため、この嵌合部に上記したように螺旋通
路を成形しても、マンドレルの支持や、筒体同士
の連結はそれぞれ十分な強度でさせることができ
る。つまり、テーパ嵌合部の利用により螺旋通路
を形成した場合でも、上記支持や連結が強度上、
何ら支障なくできるという利点がある。 Moreover, in this case, since the two parts fitted to each other in each tapered fitting part are in surface contact over a large area, even if the spiral passage is formed in this fitting part as described above, it will not be possible to support the mandrel. The cylindrical bodies can be connected with each other with sufficient strength. In other words, even when a spiral passage is formed by using a tapered fitting part, the above-mentioned support and connection are not strong enough.
The advantage is that it can be done without any problems.
図はこの考案の実施例を示す全体断面図であ
る。
１……金型、２……円形管、４……ダイス、６
……ダイス孔、７……マンドレル、８……マンド
レル主体（筒体）、９……第１筒体（筒体）、１０
……第２筒体（筒体）、１４……外側押出成形部
（押出成形部）、１６……重合押出成形部（押出成
形部）、１７……第１螺旋通路（螺旋通路）。
The figure is an overall sectional view showing an embodiment of this invention. 1...Mold, 2...Circular tube, 4...Dice, 6
...Dice hole, 7... Mandrel, 8... Mandrel main body (cylindrical body), 9... First cylinder body (cylindrical body), 10
. . . second cylindrical body (cylindrical body), 14 . . . outer extruded portion (extrusion molded portion), 16 .
Claims (1)
記ダイス孔の成形品押出方向後部にマンドレルの
後部をテーパ嵌合により支持させ、同上ダイス孔
とマンドレルの各前部間の環状間隙を円形管の押
出成形部とし、上記マンドレルを複数の筒体を互
いに嵌め合わせた多重構造にしてこれら各筒体の
後部同士をテーパ嵌合により互いに連結し、上記
各テーパ嵌合部に被成形材料を通過させる螺旋通
路を形成してこれら各螺旋通路を上記押出成形部
に連通させたことを特徴とする押出成形機の金
型。 A mandrel is placed in the die hole of the die, and the rear part of the mandrel is supported by tapered fitting at the rear part of the die hole in the extrusion direction of the molded product, and the annular gap between the die hole and each front part of the mandrel is used to extrude a circular tube. The mandrel has a multi-layered structure in which a plurality of cylindrical bodies are fitted into each other as a forming part, and the rear parts of these cylindrical bodies are connected to each other by taper fitting, and the material to be formed passes through each of the tapered fitting parts. A mold for an extrusion molding machine, characterized in that passages are formed and these spiral passages are communicated with the extrusion molding section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983146648U JPS6053516U (en) | 1983-09-20 | 1983-09-20 | Extrusion molding machine mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983146648U JPS6053516U (en) | 1983-09-20 | 1983-09-20 | Extrusion molding machine mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6053516U JPS6053516U (en) | 1985-04-15 |
| JPH0337936Y2 true JPH0337936Y2 (en) | 1991-08-12 |
Family
ID=30326366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1983146648U Granted JPS6053516U (en) | 1983-09-20 | 1983-09-20 | Extrusion molding machine mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6053516U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5584631A (en) * | 1978-11-30 | 1980-06-26 | Gloucester Eng Co Inc | Controller for maintaining expanded plastic tube at desired circumference |
-
1983
- 1983-09-20 JP JP1983146648U patent/JPS6053516U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5584631A (en) * | 1978-11-30 | 1980-06-26 | Gloucester Eng Co Inc | Controller for maintaining expanded plastic tube at desired circumference |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6053516U (en) | 1985-04-15 |
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