JPH03243313A - Manufacture of valve body for reed valve - Google Patents
Manufacture of valve body for reed valveInfo
- Publication number
- JPH03243313A JPH03243313A JP4076190A JP4076190A JPH03243313A JP H03243313 A JPH03243313 A JP H03243313A JP 4076190 A JP4076190 A JP 4076190A JP 4076190 A JP4076190 A JP 4076190A JP H03243313 A JPH03243313 A JP H03243313A
- Authority
- JP
- Japan
- Prior art keywords
- valve body
- mold
- liquid crystal
- crystal resin
- molecules
- 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.)
- Pending
Links
- 235000014676 Phragmites communis Nutrition 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000011347 resin Substances 0.000 claims abstract description 22
- 229920005989 resin Polymers 0.000 claims abstract description 22
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims description 5
- 239000000835 fiber Substances 0.000 abstract description 4
- 239000002344 surface layer Substances 0.000 abstract description 4
- 239000003365 glass fiber Substances 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 125000003118 aryl group Chemical group 0.000 abstract description 2
- 229920000728 polyester Polymers 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 238000010008 shearing Methods 0.000 abstract 1
- 238000012805 post-processing Methods 0.000 description 6
- 239000012783 reinforcing fiber Substances 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 229920006231 aramid fiber Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
- F01L3/205—Reed valves
-
- 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
-
- 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
- B29C2045/0098—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor shearing of the moulding material, e.g. for obtaining molecular orientation or reducing the viscosity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0079—Liquid crystals
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Check Valves (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】 ａ、 産業上の利用分野 本発明は、リードバルブ用弁体の製作方法に関する。[Detailed description of the invention] a. Industrial application field The present invention relates to a method for manufacturing a valve body for a reed valve.
ｂ、 従来の技術
第５図〜第７図は、−船釣な従来のリードバルブ用弁体
１０の製作方法を示すものである。b. Prior art FIGS. 5 to 7 show a conventional method of manufacturing a valve body 10 for a reed valve, which is carried out by boat.
この方法では、予め、ガラス繊維、アラミド繊維または
カーボン繊維等の繊維によって強化した樹脂板１１を複
数枚重ね合わせ、これらをブレス成形して得た積層板１
２を所定形状に打ち抜き、さらに、スリット部１３に後
加工を施して仕上げて弁体ｌＯを形成するようにしてい
た。In this method, a laminate 1 is obtained by stacking a plurality of resin plates 11 reinforced with fibers such as glass fiber, aramid fiber, or carbon fiber in advance and press-molding them.
2 is punched out into a predetermined shape, and the slit portion 13 is further processed and finished to form the valve body IO.
Ｃ６発明が解決しようとする課題
ところで、上記従来の方法では、弁体１０のスリット部
１３に後加工を施すことにより、内部の強化繊維が切断
されてほつれたりして、弁体ｌＯの先端部１０ａにおけ
る強度が大幅に低下する不具合があった。弁体１０の先
端部１０ａ は、苛酷な条件下で振動され、図示しない
弁座と打ち合うので、その先端部１０ａにおける強度低
下は、特に問題であった。C6 Problems to be Solved by the Invention By the way, in the conventional method described above, when the slit portion 13 of the valve body 10 is subjected to post-processing, the reinforcing fibers inside are cut and frayed, and the tip of the valve body IO is damaged. There was a problem that the strength in 10a was significantly reduced. Since the tip 10a of the valve body 10 is vibrated under severe conditions and collides with a valve seat (not shown), the strength reduction at the tip 10a is particularly problematic.
また、上記後加工によって、弁体１０のスリット部１３
の深部１３ａの形状がギザギザとなり易く、このため、
これらの部分で応力集中が起こり、弁体１０の寿命を低
下させる不具合もあった。In addition, by the above-mentioned post-processing, the slit portion 13 of the valve body 10 is
The shape of the deep part 13a tends to be jagged, and therefore,
There was also a problem that stress concentration occurred in these parts, reducing the lifespan of the valve body 10.
さらに、従来の方法では、弁体ｌＯのコーナ部１０ｄ（
第７図に矢印Ａで示す円ず囲む部分）が一般に強化繊維
が少ないので割れ易く、強度が不十分であった。Furthermore, in the conventional method, the corner portion 10d (
The area (circled by the arrow A in FIG. 7) generally had less reinforcing fibers, so it was easily broken and had insufficient strength.
なお、アラミド繊維を強化繊維として用いている場合に
は、この繊維がと（に切れ難い性質を有するものである
ため、スリット部１３における後加工は困難であった。Note that when aramid fibers are used as reinforcing fibers, post-processing in the slit portion 13 is difficult because these fibers are difficult to break.
本発明は、上記実情に鑑みてなされたもので、弁体の先
端部における強度が低下すること無く、そのコーナ一部
における強度が十分大きくなり、しかも、応力集中に起
因して寿命が低下することの無いリードバルブ用弁体の
製作方法を提供することを目的とする。The present invention has been made in view of the above-mentioned circumstances, and the strength at the tip of the valve body does not decrease, and the strength at a part of the corner thereof is sufficiently increased, and furthermore, the life span is shortened due to stress concentration. It is an object of the present invention to provide a method for manufacturing a valve body for a reed valve without causing problems.
ｄ、 課題を解決するための手段
本発明では、上記目的を達成するために、液晶樹脂を型
の内に射出して成形するようにしている。d. Means for Solving the Problems In the present invention, in order to achieve the above object, liquid crystal resin is injected into a mold for molding.
ｅ、 実施例
以下、本発明に係るリードバルブ用弁体の製作方法の一
実施例について、添附図面を参照しながら詳細に説明す
る。e. Example Hereinafter, an example of the method for manufacturing a valve body for a reed valve according to the present invention will be described in detail with reference to the accompanying drawings.
本実施例では、芳香族系ポリエステルを成分とする液晶
樹脂（例えば、商品名ペクトラン、クラレ社）１を用い
てリードバルブ用弁体２を製作するようにしている。In this embodiment, a reed valve body 2 is manufactured using a liquid crystal resin 1 containing aromatic polyester (for example, Pectran, manufactured by Kuraray Co., Ltd.).
ここで、液晶樹脂１は、第１図（ａ）に示すように、直
線状の高置゛子から戒るので、溶融状態でも分子同士の
からみ合いが少なく、また、その溶融粘度が小さく、流
動性も良いので、ゎずがな剪断応力をかけてやるだけで
、第１図（ｂ）に示すように、分子が一方向に配向して
流れる性質がある。Here, as shown in FIG. 1(a), since the liquid crystal resin 1 is arranged in a linear and elevated position, there is little entanglement between molecules even in the molten state, and its melt viscosity is small. It also has good fluidity, so just by applying a shear stress, the molecules will flow in one direction, as shown in Figure 1(b).
これに比べて、通常の強化繊維は、その長さおよび流動
性の悪さ等に起因して溶融状態でも、また固化させた状
態においても互いにからみ合った状態となるのが一般的
であり、このため、方向によって強度にばらつきを生じ
、所定の方向に十分な強度が得られない不具合もあった
。In comparison, ordinary reinforcing fibers are generally entangled with each other both in the molten state and in the solidified state due to their length and poor fluidity. Therefore, there was a problem that the strength varied depending on the direction, and sufficient strength could not be obtained in a predetermined direction.
本実施例では、液晶樹脂１をフィルムゲート３を介して
型（図示せず）内へ射出する。液晶樹脂１は、その流動
性の良さにより、弁体１０のような厚さ０．４閣程度の
薄物を形成する場合でもスムーズに型内へ流れて行き渡
る。このとき、液晶樹脂１の分子は、射出圧により一方
向に配向して流動して固化する。このようにして固化し
て形成される弁体２内における分子の配向を見てみると
、弁体２の画表層部分２ｃ内にある分子がその基部２ａ
から先端部２ｂに向けて一方向に配向しており（第３図
参照）、また、そのコーナ一部２ｄ内にある分子は、こ
の部分の形状に沿って配向している（第４図参照）。In this embodiment, liquid crystal resin 1 is injected into a mold (not shown) through a film gate 3. Due to its good fluidity, the liquid crystal resin 1 smoothly flows into the mold even when forming a thin object with a thickness of about 0.4 mm, such as the valve body 10. At this time, the molecules of the liquid crystal resin 1 are oriented in one direction due to the injection pressure, flow, and solidify. Looking at the orientation of the molecules in the valve body 2 that is solidified and formed in this way, it is found that the molecules in the image surface layer portion 2c of the valve body 2 are in the base 2a.
The molecules are oriented in one direction from the tip toward the tip 2b (see Figure 3), and the molecules within the corner part 2d are oriented along the shape of this part (see Figure 4). ).
このように、弁体２内において液晶樹脂１の分子が揃っ
て配向するので、あたかも、ガラス繊維等の一連の長い
繊維を用いたような補強効果が生じる。In this way, the molecules of the liquid crystal resin 1 are aligned in the valve body 2, producing a reinforcing effect as if a series of long fibers such as glass fibers were used.
型から取出された弁体２は、そのスリット部４の後加工
も要せずして完成される。The valve body 2 taken out from the mold is completed without the need for post-processing of the slit portion 4.
なお、本発明は、上記実施例に限らず、液晶樹脂に必要
に応してカーボン繊維等を混入させても良い。また、本
発明では、成形条件、型温および補強材の含有量等を適
宜変えることにより、表層部２ｃおよびコア部２ｅ内に
おける分子の配向を変えることができ、所望の特性を有
する弁体とすることができる。Note that the present invention is not limited to the above embodiments, and carbon fibers or the like may be mixed into the liquid crystal resin as necessary. Furthermore, in the present invention, by appropriately changing the molding conditions, mold temperature, reinforcing material content, etc., it is possible to change the orientation of molecules in the surface layer part 2c and the core part 2e, resulting in a valve body having desired characteristics. can do.
ｆ、 発明の詳細
な説明したように、本発明に係るリードバルブ用弁体の
製作方法によれば、液晶樹脂を型内に射出して形成する
ようにしているので、その弁体のスリット部における後
加工が不要になる。このため、従来のように、スリット
部に後加工を施すことに起因する強度低下は無くなると
ともに、スリット部の深部にギザギザが生しることも無
くなるので応力集中も生しない。さらに、弁体のコーナ
一部においても、強化繊維が十分に存在し、しかも、そ
のコーナ一部の形状に沿って配向するので、そのコーナ
一部において強化繊維不足による割れが生したすせず、
弁体の先端部における強度が大幅に向上された。このた
め、弁体の寿命の低下を防止することができた。f. As described in detail, according to the method for manufacturing a valve body for a reed valve according to the present invention, since the liquid crystal resin is injected into a mold, the slit portion of the valve body is formed by injecting liquid crystal resin into a mold. No post-processing is required. For this reason, there is no decrease in strength due to post-processing of the slit portion as in the past, and there is no jaggedness in the deep part of the slit portion, so stress concentration does not occur. Furthermore, there are sufficient reinforcing fibers in some of the corners of the valve body, and they are oriented along the shape of that corner, so cracks may occur due to lack of reinforcing fibers in some corners. ,
The strength at the tip of the valve body has been significantly improved. Therefore, it was possible to prevent a decrease in the life of the valve body.
また、本発明の方法によって製作された弁体は、優れた
振動吸収特性を有し、耐熱性に優れ、耐薬品性に優れて
いる。さらに、この弁体は、線膨脹率が小さく、成形収
縮率も小さいので、寸法安定性に優れている。Further, the valve body manufactured by the method of the present invention has excellent vibration absorption characteristics, excellent heat resistance, and excellent chemical resistance. Furthermore, this valve body has a small linear expansion rate and a small molding shrinkage rate, so it has excellent dimensional stability.
【図面の簡単な説明】
第１図〜第４図は本発明に係るリードバルブ用弁体の製
作方法の一実施例を示し、第１図（ａ）はその液晶樹脂
の溶融状態を示す図、第１図（ｂ）はその液晶樹脂が流
動している状態を示す図、第２図はその液晶樹脂を射出
成形している様子を概念的に示す斜視図、第３図は第２
図におけるＢ−Ｂ線断面図、第４図は第２図に矢印Ｃで
示す円で囲む部分を拡大して示す図、第５図〜第７図は
従来のリードバルブ用弁体の製作方法を示す図である。
■・・・液晶樹脂、
２ａ・・・基部、
２ｃ・・・表層部、
４・・・スリント部。
２・・・弁体、
２ｂ・・・先端部、
２ｄ・・・コーナ一部、
第１図
１２図[Brief Description of the Drawings] Figures 1 to 4 show an embodiment of the method for manufacturing a valve body for a reed valve according to the present invention, and Figure 1 (a) is a diagram showing the molten state of the liquid crystal resin. , FIG. 1(b) is a diagram showing the state in which the liquid crystal resin is flowing, FIG. 2 is a perspective view conceptually showing how the liquid crystal resin is injection molded, and FIG.
4 is an enlarged view of the area surrounded by the circle indicated by arrow C in FIG. 2, and FIGS. 5 to 7 are a conventional manufacturing method of a valve body for a reed valve. FIG. ■...Liquid crystal resin, 2a...Base, 2c...Surface layer part, 4...Slint part. 2...Valve body, 2b...Tip, 2d...Corner part, Fig. 1, Fig. 12
Claims (1)
リードバルブ用弁体の製作方法。A method for manufacturing a valve body for a reed valve, characterized by molding a liquid crystal resin by injecting it into a mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4076190A JPH03243313A (en) | 1990-02-21 | 1990-02-21 | Manufacture of valve body for reed valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4076190A JPH03243313A (en) | 1990-02-21 | 1990-02-21 | Manufacture of valve body for reed valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03243313A true JPH03243313A (en) | 1991-10-30 |
Family
ID=12589607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4076190A Pending JPH03243313A (en) | 1990-02-21 | 1990-02-21 | Manufacture of valve body for reed valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03243313A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5581416A (en) * | 1991-01-30 | 1996-12-03 | Minolta Camera Kabushiki Kaisha | Polygonal mirror, and manufacturing process and mold thereof |
| WO2022224747A1 (en) * | 2021-04-21 | 2022-10-27 | 株式会社デンソー | Valve device |
-
1990
- 1990-02-21 JP JP4076190A patent/JPH03243313A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5581416A (en) * | 1991-01-30 | 1996-12-03 | Minolta Camera Kabushiki Kaisha | Polygonal mirror, and manufacturing process and mold thereof |
| WO2022224747A1 (en) * | 2021-04-21 | 2022-10-27 | 株式会社デンソー | Valve device |
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