JP2009097725A5

JP2009097725A5 -

Info

Publication number: JP2009097725A5
Application number: JP2008272485A
Authority: JP
Filing date: 2008-09-25
Publication date: 2011-12-15
Anticipated expiration: 2028-09-25

Description

また、本発明は、以下の（１）〜（３）の工程を、この順序で行うことを特徴とするベローズまたはベローズ部品の製造方法である；
（１）以下の（ａ）〜（ｄ）のいずれかの成形物を用い、一つまたは複数個の山部を持つとともに外子金型と相対する表面は鏡面仕上げされている中子を、成形物の内側に挿入する工程、
（ａ）ポリテトラフルオロエチレンを円筒状に予備成形した成形物、
（ｂ）ポリテトラフルオロエチレンをビーカー状に予備成形した成形物、
（ｃ）切削加工されたポリテトラフルオロエチレン製ベローズ若しくはベローズ部品、または
（ｄ）ブロー成形されたポリテトラフルオロエチレン製ベローズ若しくはベローズ部品、
（２）中子と、以下の（ａ）〜（ｄ）の要件を満たす金型群とを用い、成形物の溶融温度以上で成形物を溶融加圧して中子に密着させる工程、
（ａ）外子金型と後押し用外子金型は、中子を中心として、その周りに配置されている、
（ｂ）外子金型と後押し用外子金型は、中子の中心軸に平行な分割辺で周方向に同数で分割されており、それぞれ中子の山部のある位置に相対するところは前記中子の山部に対応した山部を有している、
（ｃ）分割された外子金型及び後押し用外子金型は、外子金型を内側、後押し用外子金型を外側として、分割辺の近傍部分が部分的に重なり合いながら、中子の周りに交互に円形に配置され、加圧過程で前記後押し用外子金型を中子側に移動させることにより、前記外子金型と後押し用外子金型が相互に周方向に隙間無くスライドして、加圧の最終段階では外子金型だけで前記工程の成形物の外周を囲むように、後押し用外子金型が外子金型を取り囲み、及び
（ｄ）一個の外子金型が作る円弧の中心角αと一個の後押し用外子金型が作る円弧の中心角βとがα＞βを満たす、
（３）前記工程の生成物から中子を抜く工程。Moreover, this invention is a manufacturing method of the bellows or bellows component characterized by performing the process of the following (1)-(3) in this order;
(1) Using a molded product of any of the following (a) to (d), a core having one or a plurality of crests and having a mirror-finished surface facing the outer mold, Inserting into the inside of the molding,
(A) a molded product obtained by preforming polytetrafluoroethylene into a cylindrical shape;
(B) a molded product obtained by preforming polytetrafluoroethylene into a beaker;
(C) a machined polytetrafluoroethylene bellows or bellows part, or (d) a blow molded polytetrafluoroethylene bellows or bellows part,
(2) a step of using a core and a mold group satisfying the following requirements (a) to (d), and melt-pressing the molded product at a temperature equal to or higher than the melting temperature of the molded product to closely adhere to the core;
(A) The outer mold and the booster outer mold are arranged around the core,
(B) The outer die and the booster outer die are divided in the same number in the circumferential direction by dividing sides parallel to the central axis of the core, and each is opposed to a position where the core has a peak. Has a peak corresponding to the peak of the core,
(C) The divided outer die and the pushing outer die are arranged such that the outer die is on the inner side and the pushing outer die is on the outer side while the vicinity of the divided sides partially overlap. Are arranged alternately in a circle around, and the outer die for pushing and the outer die for pushing are spaced apart from each other in the circumferential direction by moving the pushing outer die to the core side in the pressurizing process. And the outer mold for boosting surrounds the outer mold so that the outer mold only surrounds the outer periphery of the molded product in the final stage of pressurization, and (d) one outer The center angle α of the arc formed by the child mold and the center angle β of the arc formed by one booster outer mold satisfy α> β .
(3) A step of removing the core from the product of the step.

また、本発明は、以下の（１）〜（５）の工程を、この順序で行うことを特徴するベローズまたはベローズ部品の製造方法である；
（１）切削加工若しくはブロー成形されたＰＴＦＥ製のベローズまたはベローズ部品の両端を鍔返してフランジ部を形成する工程、
（２）以下の（ａ）〜（ｅ）の要件を満たす金型群の内側に、前記工程成形物を置き、軟化温度以上に加熱しながら、前記工程成形物の内側から加圧して、前記工程で形成されたフランジ間の成形物を膨張させる工程、
（ａ）外子金型と後押し用外子金型は、後に設置する中子を中心として、その周りに配置されている、
（ｂ）外子金型と後押し用外子金型は、中子の中心軸に平行な分割辺で周方向に同数で分割されている、
（ｃ）分割された外子金型及び後押し用外子金型は、外子金型を内側、後押し用外子金型を外側として、分割辺の近傍部分が部分的に重なり合いながら、中子の周りに交互に円形に配置され、加圧過程で前記後押し用外子金型を中子側に移動させることにより、前記外子金型と後押し用外子金型が相互に周方向に隙間無くスライドして、加圧の最終段階では外子金型だけで前記工程の成形物の外周を囲むように、後押し用外子金型が外子金型を取り囲み、及び
（ｄ）一個の外子金型が作る円弧の中心角αと一個の後押し用外子金型が作る円弧の中心角βとの間にα＞βを満たす、
（３）一つまたは複数個の山部を持ち、外子金型と相対する表面は鏡面仕上げされた中子を、前記金型群の内側の所定の位置に挿入する工程、
（４）前記成形物をその溶融温度以上に加熱して、前記工程で形成されたフランジ間の成形物を前記金型群により溶融加圧して中子に密着させる工程、
並びに
（５）前記工程の生成物から中子を抜く工程。Moreover, this invention is a manufacturing method of the bellows or bellows component characterized by performing the process of the following (1)-(5) in this order;
(1) A step of turning the both ends of a PTFE bellows or bellows part that has been cut or blow molded to form a flange portion;
(2) Place the process molding inside the mold group that satisfies the following requirements (a) to (e), pressurize from the inside of the process molding while heating to the softening temperature or higher, and A step of expanding a molding between the flanges formed in the step;
(A) The outer die and the pushing outer die are arranged around the core to be installed later,
(B) The outer die and the booster outer die are divided by the same number in the circumferential direction with divided sides parallel to the central axis of the core.
(C) The divided outer die and the pushing outer die are arranged such that the outer die is on the inner side and the pushing outer die is on the outer side while the vicinity of the divided sides partially overlap. Are arranged alternately in a circle around, and the outer die for pushing and the outer die for pushing are spaced apart from each other in the circumferential direction by moving the pushing outer die to the core side in the pressurizing process. And the outer mold for boosting surrounds the outer mold so that the outer mold only surrounds the outer periphery of the molded product in the final stage of pressurization, and (d) one outer Α> β is satisfied between the center angle α of the arc formed by the child mold and the center angle β of the arc formed by one pushing outer mold.
(3) A step of inserting a core having one or a plurality of ridges and having a mirror-finished surface opposite to the outer mold into a predetermined position inside the mold group;
(4) A step of heating the molded product to a temperature higher than its melting temperature and causing the molded product between the flanges formed in the step to be melt-pressed by the mold group and adhered to the core,
And (5) A step of removing the core from the product of the above step.

また、本発明は、一つまたは複数個の山部を持ち、外子金型と相対する表面は鏡面仕上げされている中子と、以下の（ａ）〜（ｅ）の要件を満たす金型群と、被成形物を加熱するための装置と、金型群と加熱装置を移動させる装置を有するベローズ製造装置である；
（ａ）外子金型と後押し用外子金型は、中子を中心として、その周りに配置されている、
（ｂ）外子金型と後押し用外子金型は、中子の中心軸に平行な分割辺で周方向に同数で分割されており、それぞれ中子の山部のある位置に相対するところは前記中子の山部に対応した山部を有している、
（ｃ）分割された外子金型及び後押し用外子金型は、外子金型を内側、後押し用外子金型を外側として、分割辺の近傍部分が部分的に重なり合いながら、中子の周りに交互に円形に配置され、加圧過程で前記後押し用外子金型を中子側に移動させることにより、前記外子金型と後押し用外子金型が相互に周方向に隙間無くスライドして、加圧の最終段階では外子金型だけで前記工程の成形物の外周を囲むように、後押し用外子金型が外子金型を取り囲み、及び
（ｄ）一個の外子金型が作る円弧の中心角αと一個の後押し用外子金型が作る円弧の中心角βとがα＞βを満たす。The present invention also includes a core having one or a plurality of crests, the surface facing the outer mold being mirror-finished, and a mold satisfying the following requirements (a) to (e): A bellows manufacturing apparatus having a group, an apparatus for heating the object to be molded, and a device for moving the mold group and the heating apparatus;
(A) The outer mold and the booster outer mold are arranged around the core,
(B) The outer die and the booster outer die are divided in the same number in the circumferential direction by dividing sides parallel to the central axis of the core, and each is opposed to a position where the core has a peak. Has a peak corresponding to the peak of the core,
(C) The divided outer die and the pushing outer die are arranged such that the outer die is on the inner side and the pushing outer die is on the outer side while the vicinity of the divided sides partially overlap. Are arranged alternately in a circle around, and the outer die for pushing and the outer die for pushing are spaced apart from each other in the circumferential direction by moving the pushing outer die to the core side in the pressurizing process. And the outer mold for boosting surrounds the outer mold so that the outer mold only surrounds the outer periphery of the molded product in the final stage of pressurization, and (d) one outer The center angle α of the arc formed by the child mold and the center angle β of the arc formed by one booster outer mold satisfy α> β .

Claims

A bellows or a bellows part which is melt-pressed into a bellows shape and is made of polytetrafluoroethylene.

A bellows or a bellows part, which is melt-pressed into a bellows shape and made of polytetrafluoroethylene having at least an inner surface as a mirror surface.

The bellows or bellows component according to claim 1 or 2, wherein the visible light transmittance at a thickness of 1 mm is 50% or more.

It is a screw type, The bellows or bellows component of any one of Claims 1-3.

The following steps (1) to (3) are performed in this order, and a method for manufacturing a bellows or a bellows part;
(1) Using a molded product of any of the following (a) to (d), a core having one or a plurality of crests and having a mirror-finished surface facing the outer mold, Inserting into the inside of the molding,
(A) a molded product obtained by preforming polytetrafluoroethylene into a cylindrical shape;
(B) a molded product obtained by preforming polytetrafluoroethylene into a beaker;
(C) a machined polytetrafluoroethylene bellows or bellows part, or (d) a blow molded polytetrafluoroethylene bellows or bellows part,
(2) a step of using a core and a mold group satisfying the following requirements (a) to (d), and melt-pressing the molded product at a temperature equal to or higher than the melting temperature of the molded product to closely adhere to the core;
(A) The outer mold and the booster outer mold are arranged around the core,
(B) The outer die and the booster outer die are divided in the same number in the circumferential direction by dividing sides parallel to the central axis of the core, and each is opposed to a position where the core has a peak. Has a peak corresponding to the peak of the core,
(C) The divided outer die and the pushing outer die are arranged such that the outer die is on the inner side and the pushing outer die is on the outer side while the vicinity of the divided sides partially overlap. Are arranged alternately in a circle around, and the outer die for pushing and the outer die for pushing are spaced apart from each other in the circumferential direction by moving the pushing outer die to the core side in the pressurizing process. And the outer mold for boosting surrounds the outer mold so that the outer mold only surrounds the outer periphery of the molded product in the final stage of pressurization, and (d) one outer The center angle α of the arc formed by the child mold and the center angle β of the arc formed by one booster outer mold satisfy α> β.
(3) A step of removing the core from the product of the step.

The following steps (1) to (3) are performed in this order, and a method for manufacturing a bellows or a bellows part;
(1) Using the molded product of any of the following (a) to (d), a core having one or a plurality of crests and having a mirror-finished surface is inserted into the molded product. Process,
(A) a molded product obtained by preforming polytetrafluoroethylene into a cylindrical shape;
(B) a molded product obtained by preforming polytetrafluoroethylene into a beaker;
(C) a machined polytetrafluoroethylene bellows or bellows part, or (d) a blow molded polytetrafluoroethylene bellows or bellows part,
(2) A step of heating the molded product to a melting temperature or higher and adding a pressurized fluid from the outside to melt and press the molded product to adhere to the core, and (3) removing the core from the product of the above step. Unplugging process.

The step of removing the core includes
One end of the molded product in close contact with the core is folded outward to form a flange portion, and the molded product is thermally expanded to form a gap between the core and pressurized fluid is added to the gap. The method for manufacturing a bellows or a bellows part according to claim 5 or 6, wherein the molding is a step of expanding the flange portion by applying a mechanical force together with the molding and extracting the core.

The step of removing the core includes
In the case of a surface-shaped core in which the molded product becomes a screw-type bellows or its parts by transfer, it is a step of extracting the core by melting and pressing the molded product and then cooling and rotating the core. 7. A method for manufacturing a bellows or a bellows part according to claim 5 or 6.

The method for producing a bellows or a bellows part according to claim 5 or 6, wherein the preform is a molding powder as a starting material.

The following steps (1) to (5) are performed in this order;
(1) A step of turning the both ends of a cut or blow-molded polytetrafluoroethylene bellows or a bellows part to form a flange portion,
(2) Place the process molding inside the mold group that satisfies the following requirements (a) to (e), pressurize from the inside of the process molding while heating to the softening temperature or higher, and A step of expanding a molding between the flanges formed in the step;
(A) The outer die and the pushing outer die are arranged around the core to be installed later,
(B) The outer die and the booster outer die are divided by the same number in the circumferential direction with divided sides parallel to the central axis of the core.
(C) The divided outer die and the pushing outer die are arranged such that the outer die is on the inner side and the pushing outer die is on the outer side while the vicinity of the divided sides partially overlap. Are arranged alternately in a circle around, and the outer die for pushing and the outer die for pushing are spaced apart from each other in the circumferential direction by moving the pushing outer die to the core side in the pressurizing process. And the outer mold for boosting surrounds the outer mold so that the outer mold only surrounds the outer periphery of the molded product in the final stage of pressurization, and (d) one outer Α> β is satisfied between the center angle α of the arc formed by the child mold and the center angle β of the arc formed by one pushing outer mold.
(3) a step of inserting a core having one or a plurality of crests and having a mirror-finished surface opposite to the outer mold into a predetermined position inside the mold group;
(4) A step of heating the molded product to a temperature higher than its melting temperature and causing the molded product between the flanges formed in the step to be melt-pressed by the mold group and adhered to the core,
And (5) A step of removing the core from the product of the above step.

The step of removing the core includes
The molded product in close contact with the core is fully expanded to form a gap with the core, and a pressurized fluid is added to the gap to expand the molded product, and a mechanical force is applied to the flange to add a flange. The method of manufacturing a bellows or a bellows part according to claim 10, wherein the step is a step of extracting the core by expanding the portion.

The method of removing the core from the product of the above step is as follows:
In the case of a surface-shaped core in which the molded product becomes a screw-type bellows or its parts by transfer, it is a step of extracting the core by melting and pressing the molded product and then cooling and rotating the core. The method for producing a bellows or bellows component according to claim 10.

The following steps (1) to (3) are performed in this order, and a method for manufacturing a bellows or a bellows part;
(1) While a cut or blow molded polytetrafluoroethylene bellows or bellows part is heated above the softening temperature, it is pressurized and expanded from the inside of the bellows, and has one or more peaks. Inserting a core whose surface is mirror finished,
(2) heating the molded product to a melting temperature or higher and adding a pressurized fluid from the outside to melt and press the molded product to adhere to the core; and (3) from the product of the step The process of pulling out the child.

The step of removing the core includes
One end of the molded product in close contact with the core is folded outward to form a flange portion, and the molded product is thermally expanded to form a gap between the core and pressurized fluid is added to the gap. The method of manufacturing a bellows or a bellows part according to claim 13, wherein the molding is a step of expanding a flange portion by applying a mechanical force together with the molding and extracting a core.

The step of removing the core includes
In the case of a core having a surface shape such that the molded product becomes a screw-type bellows or a part thereof by transfer, the core is extracted by melting and pressing the molded product, cooling the core, and rotating. 14. A method for producing a bellows or bellows component according to item 13.

The method for manufacturing a bellows or a bellows part according to any one of claims 5 to 15, further comprising a step of applying pressure from both ends of the bellows or the bellows part after the core is removed.

The manufacturing method of the bellows or bellows component of any one of Claims 5-16 including the process of quenching with pressure after melt-bonding.

A core having one or a plurality of crests, the surface facing the outer mold being mirror-finished, a mold group satisfying the following requirements (a) to (e), and a molded article Bellows manufacturing apparatus having a device for heating the mold, and a device for moving the mold group and the heating device;
(A) The outer mold and the booster outer mold are arranged around the core,
(B) The outer die and the booster outer die are divided in the same number in the circumferential direction by dividing sides parallel to the central axis of the core, and each is opposed to a position where the core has a peak. Has a peak corresponding to the peak of the core,
(C) The divided outer die and the pushing outer die are arranged such that the outer die is on the inner side and the pushing outer die is on the outer side while the vicinity of the divided sides partially overlap. Are arranged alternately in a circle around, and the outer die for pushing and the outer die for pushing are spaced apart from each other in the circumferential direction by moving the pushing outer die to the core side in the pressurizing process. And the outer mold for boosting surrounds the outer mold so that the outer mold only surrounds the outer periphery of the molded product in the final stage of pressurization, and (d) one outer The center angle α of the arc formed by the child mold and the center angle β of the arc formed by one booster outer mold satisfy α> β.

A core having a surface shape such that the molded product becomes a bellows or a bellows part by transfer and the surface is mirror-finished, a device for heating the molded product, and a device for applying pressurized fluid to these, Bellows manufacturing apparatus having a device for moving a heating device.

An apparatus for applying a pressurized fluid to a gap generated between a workpiece and a core by thermal expansion, a core pulling-up device, a flange portion forming device, and a core punching device comprising a flange portion expanding device. The bellows manufacturing apparatus of any one of 17-19.

A fluid pumping device using the bellows according to any one of claims 1 to 4 or the bellows obtained by the method for producing a bellows according to any one of claims 5 to 17.

The fluid pumping device according to claim 21, which is used in combination with a non-contact type valve.

A bellows or bellows part, characterized in that it is melt-pressed into a bellows shape and made of a resin having a fluid resistance of at least 500,000 P (poise) or more when the inner surface is in a mirror state.

A method for manufacturing a bellows or a bellows part, wherein the core is rapidly cooled by performing melt-pressure molding using the core in the manufacturing method according to any one of claims 5, 6, 10, and 13.