JPH0414176Y2 - - Google Patents
Info
- Publication number
- JPH0414176Y2 JPH0414176Y2 JP9731287U JP9731287U JPH0414176Y2 JP H0414176 Y2 JPH0414176 Y2 JP H0414176Y2 JP 9731287 U JP9731287 U JP 9731287U JP 9731287 U JP9731287 U JP 9731287U JP H0414176 Y2 JPH0414176 Y2 JP H0414176Y2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- ptfe sheet
- molding
- packing
- rubber
- 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
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 18
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 18
- 238000000465 moulding Methods 0.000 claims description 12
- 238000012856 packing Methods 0.000 claims description 8
- 239000004744 fabric Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、成形加工技術に係るパツキン成形型
の改良に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to improvement of a packing mold related to molding technology.
従来から、第６図に例示するような、リツプ８
の内周摺動部に低摩擦係数材料であるPTFEシー
ト４が焼き付けられたゴム製のパツキン７の成形
には、第７図ないし第９図に示すように、成形用
キヤビテイ２を構成する成形面２ａ，２ｂ，２ｃ
が形成された分割型１ａ，１ｂ，１ｃよりなる成
形型を用いている。
Conventionally, lip 8 as illustrated in FIG.
As shown in FIGS. 7 to 9, in order to mold the rubber gasket 7 on which the PTFE sheet 4, which is a low friction coefficient material, is baked onto the inner peripheral sliding part, the molding that constitutes the molding cavity 2 is used. Surfaces 2a, 2b, 2c
A mold consisting of divided molds 1a, 1b, and 1c in which are formed is used.
下側の分割型１ａは、その成形面２ａの近傍に
平面部３が形成されており、成形に際しては、第
７図にようにまずこの平面部３に薄い円盤状の
PTFEシート４を載置し、さらにその上にゴム生
地５を載せて、加圧（型締め）・加熱する。第８
図に示す加圧過程において、熱により軟化した
PTFEシート４は、可塑化してキヤビテイ２内に
入り込んだゴム生地５の圧力によつて絞られ、第
９図の加圧完了状態に示す形状で硬化する。 The lower split mold 1a has a flat part 3 formed near its molding surface 2a, and during molding, a thin disk-shaped part is first placed on this flat part 3 as shown in FIG.
The PTFE sheet 4 is placed, and the rubber fabric 5 is further placed on top of it, followed by pressurization (mold clamping) and heating. 8th
During the pressurization process shown in the figure, the material softened due to heat.
The PTFE sheet 4 is squeezed by the pressure of the rubber fabric 5 that has been plasticized and entered into the cavity 2, and is hardened into the shape shown in the pressurized state shown in FIG. 9.
ところが、上記従来の成形型によれば、第８図
に示す加圧過程において、可塑化したゴム生地５
は太矢印で示すように主に外周方向へ流動する
が、成形型の傾斜等によつてこの流動が不均一に
なると、軟化したPTFEシート４がこのゴム生地
５とともに動いて所定の位置からずれてしまい、
部分的な皺ができてしまつたり、また該PTFEシ
ート４の焼付け状態が不均一となる等の不具合が
生じていた。
However, according to the conventional mold, the plasticized rubber fabric 5 is removed during the pressurizing process shown in FIG.
flows mainly toward the outer circumference as shown by thick arrows, but if this flow becomes uneven due to the inclination of the mold, etc., the softened PTFE sheet 4 moves together with the rubber fabric 5 and deviates from its predetermined position. I ended up
Problems such as partial wrinkles and uneven baking of the PTFE sheet 4 occurred.
そこで本考案は、優れた品質のパツキンを得る
ことを目的としてその成形型を改良するものであ
る。 Therefore, the present invention improves the molding die for the purpose of obtaining a packing of excellent quality.
すなわち、本考案に係るパツキン成形型は、摺
動部の周面にPTFEシートを焼き付けたゴム製の
パツキンを成形する成形型であつて、下側分割型
の成形用キヤビテイの隣の、PTFEシートおよび
ゴム生地を載置する環状の平面部に所要数の凹部
を形成したことを特徴とする。
That is, the packing mold according to the present invention is a mold for molding a rubber packing with a PTFE sheet baked on the peripheral surface of the sliding part, and the PTFE sheet is placed next to the molding cavity of the lower split mold. Also, a required number of recesses are formed in the annular flat part on which the rubber fabric is placed.
加圧・加熱時、軟化したPTFE材は、可塑化し
挾圧されたゴム生地の圧力によつて前記平面部へ
押圧され、その一部が凹部に喰い込むため、
PTFEシートは定位置に固定される。
During pressurization and heating, the softened PTFE material is pressed against the flat part by the pressure of the plasticized and pressed rubber fabric, and a part of it bites into the recess.
The PTFE sheet is fixed in place.
つぎに、本考案の一実施例について説明する
と、第１図および第２図に示すようにPTFEシー
ト４およびゴム生地５を載置する下側の分割型１
ａの環状の平面部３に凹部６として複数の座グリ
穴を周方向に等配に形成したもので、第３図に示
す加圧過程において熱により軟化いたPTFEシー
ト４は、ゴム生地５に加わる圧力によつて平面部
３に押付けられ、凹部６との対向部４′は該凹部
６へ喰い込み、ゴム生地５の流動に伴なうPTFE
シート４のずれが防止される。
Next, an embodiment of the present invention will be described. As shown in FIGS. 1 and 2, a lower split mold 1 on which a PTFE sheet 4 and a rubber fabric 5 are placed
A plurality of counterbore holes are formed as recesses 6 in the annular flat part 3 of FIG. 3 at equal intervals in the circumferential direction. The part 4' facing the concave part 6 is pressed against the flat part 3 by the applied pressure, and the part 4' that faces the concave part 6 bites into the concave part 6, and as the rubber fabric 5 flows, the PTFE
Sheet 4 is prevented from shifting.
なお、凹部４の形状としては、上記のような座
グリ穴状のほか、第４図Ａ，Ｂ，Ｃに示すような
複数の長溝状としたものや、第５図Ａ，Ｂに示す
ようなＶ字形あるいは半円形の断面形状としたも
のなどが考えられる。 In addition to the counterbore shape as described above, the recess 4 may have a plurality of long groove shapes as shown in FIGS. 4A, B, and C, or as shown in FIGS. 5A and B. A V-shaped or semicircular cross-sectional shape may be considered.
〔考案の効果〕
上述のように、本考案のパツキン成形型は、
PTFEシートを載置する平面部に凹部を設け、ゴ
ム生地からの圧力によつてPTFEシートの一部を
前記凹部に喰い込ませるようにしたため、プレス
や型の傾斜その他の何らかの原因でゴム生地に不
均一な流れが生じてもPTFEシートの位置ずれが
起こらず、均一なPTFEシートの焼付けが可能と
なり、パツキンの品質が向上するといつた優れた
効果を奏する。[Effects of the invention] As mentioned above, the packing mold of the invention has the following effects:
A recess is provided in the flat surface on which the PTFE sheet is placed, and a portion of the PTFE sheet is pushed into the recess by pressure from the rubber fabric. Even if uneven flow occurs, the position of the PTFE sheet does not shift, making it possible to bake the PTFE sheet uniformly, which has excellent effects such as improving the quality of the seal.
第１図は本考案の一実施例を示す要部断面図、
第２図は同じく要部平面図、第３図は同じく加圧
過程における要部断面図、第４図Ａ，Ｂ，Ｃは他
の実施例として凹部の平面形状例を示す説明図、
第５図Ａ，Ｂは他の実施例として凹部の断面形状
例を示す説明図、第６図はパツキンの半裁断面
図、第７図ないし第９図は従来の成形型による成
形工程を示す要部断面図である。
１ａ，１ｂ，１ｃ……分割型、２ａ，２ｂ，２
ｃ……成形面、３……平面部、４……PTFEシー
ト、４′……凹部との対向部、５……ゴム生地、
６……凹部、７……パツキン、８……リツプ。
FIG. 1 is a cross-sectional view of essential parts showing an embodiment of the present invention;
FIG. 2 is a plan view of the main part, FIG. 3 is a sectional view of the main part in the pressurizing process, and FIGS. 4A, B, and C are explanatory diagrams showing examples of the planar shape of the recess as other embodiments,
5A and 5B are explanatory diagrams showing examples of cross-sectional shapes of recesses as other embodiments, FIG. 6 is a half-cut sectional view of the packing, and FIGS. 7 to 9 are schematic diagrams showing the molding process using a conventional mold. FIG. 1a, 1b, 1c...divided type, 2a, 2b, 2
c... Molding surface, 3... Flat part, 4... PTFE sheet, 4'... Part facing the recess, 5... Rubber fabric,
6...Concavity, 7...Putkin, 8...Rip.
Claims (1)
ム製のパツキン７を成形する成形型であつて、下
側分割型１ａの成形用キヤビテイ２の隣の、
PTFEシート４およびゴム生地５を載置する環状
の平面部３に所要数の凹部６を形成したことを特
徴とするパツキン成形型。 A mold for molding a rubber packing 7 with a PTFE sheet 4 baked on the circumferential surface of the sliding part, which is located next to the molding cavity 2 of the lower split mold 1a.
A packing mold characterized in that a required number of recesses 6 are formed in an annular flat part 3 on which a PTFE sheet 4 and a rubber dough 5 are placed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9731287U JPH0414176Y2 (en) | 1987-06-26 | 1987-06-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9731287U JPH0414176Y2 (en) | 1987-06-26 | 1987-06-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS643410U JPS643410U (en) | 1989-01-10 |
| JPH0414176Y2 true JPH0414176Y2 (en) | 1992-03-31 |
Family
ID=31322665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9731287U Expired JPH0414176Y2 (en) | 1987-06-26 | 1987-06-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0414176Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5160318B2 (en) * | 2008-06-16 | 2013-03-13 | 株式会社水道技術開発機構 | Branch pipe connection device and branch pipe connection method |
-
1987
- 1987-06-26 JP JP9731287U patent/JPH0414176Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS643410U (en) | 1989-01-10 |
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