JPH0576718U - Mold for resin products - Google Patents
Mold for resin productsInfo
- Publication number
- JPH0576718U JPH0576718U JP2413992U JP2413992U JPH0576718U JP H0576718 U JPH0576718 U JP H0576718U JP 2413992 U JP2413992 U JP 2413992U JP 2413992 U JP2413992 U JP 2413992U JP H0576718 U JPH0576718 U JP H0576718U
- Authority
- JP
- Japan
- Prior art keywords
- boss
- gate
- molding
- cutout
- thickness
- 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.)
- Granted
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
(57)【要約】
【目的】 成形時に切欠き部に発生して応力に対する強
度を低下させるウェルド部の形成を抑止する構造とし
た。
【構成】 貫通孔２に切欠き部３を付されたボス部１を
有する樹脂製品を射出成形する成形型において、ボス部
１に連なって成形材料を注入されるゲート部４の前記切
欠き部３に連なる部分の径方向の肉厚Ｌ1 を、前記ボス
部１の周辺部に連なる前記ゲート部４の部分の肉厚Ｌ2
の80〜120 ％の範囲に設定されている構造とした。
(57) [Summary] [Purpose] The structure was designed to prevent the formation of welds that occur in the notches during molding and reduce the strength against stress. In a molding die for injection molding a resin product having a boss portion 1 having a notch portion 3 in a through hole 2, the notch portion of a gate portion 4 continuous with the boss portion 1 and into which a molding material is injected. The radial thickness L 1 of the portion connected to 3 is the thickness L 2 of the gate portion 4 connected to the peripheral portion of the boss 1.
The structure is set in the range of 80 to 120%.
Description
【０００１】[0001]
本考案は、可塑性を備えた樹脂材料をもって製作され、中央部に貫通孔を設け られたボス部を有し、かつ、キー溝等の切欠き部を貫通孔の内周面に付設された 製品の製作に使用される成形型の構造に関する。 The present invention is a product which is made of a resin material having plasticity, has a boss portion provided with a through hole in the central portion, and is provided with a notch such as a key groove on the inner peripheral surface of the through hole. The present invention relates to a structure of a molding die used for manufacturing a mold.
【０００２】[0002]
熱可塑性樹脂材料による製品の製作は、射出成形法が能率的である。 図４に示すように、中央部に軸等を嵌入される貫通孔２を穿たれ、かつ、該貫 通孔２の内周面にキー溝等の切欠き部３を付されたボス部１および該ボス部１か ら外方へ伸びた動力伝達用歯部等の機能部分を有する樹脂製品の射出成形に使用 される成形型においては、ボス部１の外径よりも小径の円盤形状に形成されたゲ ート部４へ注入された流動状の成形用樹脂材料がボス部１およびボス部１から外 方へ伸びた機能部分を形成するように構成されている。 The injection molding method is efficient for manufacturing a product made of a thermoplastic resin material. As shown in FIG. 4, a boss portion 1 having a through hole 2 into which a shaft or the like is fitted is formed in a central portion, and a notch portion 3 such as a key groove is provided on an inner peripheral surface of the through hole 2. In addition, in a molding die used for injection molding of a resin product having a functional portion such as a power transmission tooth portion extending outward from the boss portion 1, a disc shape having a diameter smaller than the outer diameter of the boss portion 1 is used. The fluid molding resin material injected into the formed gate portion 4 is configured to form the boss portion 1 and a functional portion extending outward from the boss portion 1.
【０００３】[0003]
上記した従来の技術による樹脂製品用成形型によって射出成形された製品にお いては、ボス部１の切欠き部３に連なるゲート部１の径方向の肉厚Ｌ1 が、切欠 き部３以外のボス部１の部分に連なるゲート部４の径方向の肉厚Ｌ2 に比べて著 しく薄く設定されているために、成形過程時における樹脂材料の流れを強く阻害 され、図５に示すように、材料の不連続な流れによるウェルド部５が発生し、運 転に伴って付加される応力に対する強度を著しく低下させることがある。In the product injection-molded by the above-described conventional resin product molding die, the radial thickness L 1 of the gate portion 1 connected to the cutout portion 3 of the boss portion 1 is other than the cutout portion 3. Since the thickness of the gate portion 4 connected to the boss portion 1 is significantly smaller than the radial thickness L 2 of the gate portion 4, the flow of the resin material during the molding process is strongly hindered, and as shown in FIG. In addition, the weld portion 5 may be generated due to the discontinuous flow of the material, and the strength against the stress applied during the operation may be significantly reduced.
【０００４】[0004]
本考案は、上記した従来の技術による成形型による製品における問題点を考慮 してなされたもので、切欠き部を付された貫通孔を備えたボス部に連なって成形 用材料を注入されるゲート部のボス部の切欠き部側の部分の径方向の肉厚を、前 記ボス部の周辺部に連なる前記ゲート部の部分の肉厚の80〜120 ％の範囲に設定 されている構成を備えるものである。 The present invention has been made in consideration of the problems of the above-described conventional molding die product, in which the molding material is injected continuously to the boss portion having the through hole with the cutout portion. The thickness of the portion of the gate portion on the cutout side of the boss portion in the radial direction is set within the range of 80 to 120% of the thickness of the portion of the gate portion that is continuous with the peripheral portion of the boss portion. It is equipped with.
【０００５】[0005]
上記した構造を備えた本考案による樹脂材製品用成形型においては、ボス部の 切欠き部に連なるゲート部の部分の径方向の肉厚を、ボス部の周辺部に連なるゲ ート部の部分の肉厚の80〜120 ％の範囲に設定されている構造が、成形過程時に 注入された成形材料の流動流路の断面積を略均等に形成させる。 In the molding die for resin material products according to the present invention having the above-mentioned structure, the radial thickness of the gate portion connected to the cutout portion of the boss portion is made equal to that of the gate portion connected to the peripheral portion of the boss portion. The structure set in the range of 80 to 120% of the wall thickness of the portion makes the cross-sectional area of the flow passage of the molding material injected during the molding process substantially uniform.
【０００６】[0006]
図１の実施例は、貫通孔２の内面に付された切欠き部３を挟むボス部１の部分 に連なるゲート部４の部分の外周部を略凸字様に拡張させることによって、ボス 部１の切欠き部３を挟む部分に連なるゲート部４の部分の径方向の肉厚Ｌ1 を、 ボス部１の切欠き部３以外の部分に連なるゲート部４の部分の肉厚Ｌ2 と略同等 に設定されている。 図２の第２の実施例は、ゲート部４の切欠き部３側の略半周部の中心点を切欠 き部３側へ偏心させることによって、ボス部１の切欠き部３を挟む部分に連なる ゲート部４の部分の径方向の肉厚Ｌ1 を、ボス部１の切欠き部３以外の部分に連 なるゲート部４の部分の肉厚Ｌ2 と略同等に設定されている。 図３の第３の実施例は、切欠き部３側のゲート部４の部分を外方へ拡張させた 円弧形状に拡張させることによって、ボス部１の切欠き部３を挟む部分に連なる ゲート部４の部分の径方向の肉厚Ｌ1 を、ボス部１の切欠き部３以外の部分に連 なるゲート部４の部分の肉厚Ｌ2 と略同等に設定されている。In the embodiment of FIG. 1, the boss portion is expanded by expanding the outer peripheral portion of the portion of the gate portion 4 connected to the portion of the boss portion 1 sandwiching the cutout portion 3 provided on the inner surface of the through hole 2 in a substantially convex shape. The thickness L 1 in the radial direction of the portion of the gate portion 4 connected to the portion sandwiching the notch portion 3 of 1 is the thickness L 2 of the portion of the gate portion 4 connected to the portion other than the notch portion 3 of the boss portion 1. The settings are almost the same. In the second embodiment of FIG. 2, the center point of the semicircular portion of the gate portion 4 on the side of the cutout portion 3 is eccentric to the cutout portion 3 side so that the cutout portion 3 of the boss portion 1 is sandwiched. The radial thickness L 1 of the continuous gate portion 4 is set to be substantially equal to the thickness L 2 of the gate portion 4 continuous with the portion other than the cutout portion 3 of the boss 1. In the third embodiment shown in FIG. 3, the gate portion 4 on the side of the cutout portion 3 is expanded in an outwardly arcuate shape so as to be continuous with the portion of the boss portion 1 sandwiching the cutout portion 3. The radial thickness L 1 of the portion 4 is set to be substantially equal to the thickness L 2 of the portion of the gate portion 4 connected to the portion of the boss portion 1 other than the cutout portion 3.
【０００７】[0007]
本考案による樹脂材製品用成形型が、上記したように、切欠き部を付された貫 通孔を備えたボス部に連なって成形用材料を注入されるゲート部の切欠き部に連 なる部分の径方向の肉厚を、ボス部の周辺部に連なるゲート部の部分の肉厚の80 〜120 ％の範囲に設定されていることにより、成形用材料の流動流路の断面積が ゲート部の全周に亘って略均等に形成されるので、従来の技術による樹脂製品用 成形型を用いた成形過程において避けられなかったウェルド部の形成が効果的に 抑止され、その結果、運転に伴う応力に対する強度の低下が防止される。 As described above, the molding die for resin material products according to the present invention is connected to the notch portion of the gate portion into which the molding material is injected in connection with the boss portion having the through hole provided with the notch portion. The radial thickness of the part is set within the range of 80 to 120% of the wall thickness of the gate part connected to the peripheral part of the boss part, so that the cross-sectional area of the flow path of the molding material is the gate. Since it is formed almost uniformly over the entire circumference of the part, the formation of the weld part, which was unavoidable in the molding process using the conventional resin product molding die, is effectively suppressed, and as a result, the operation is not possible. The decrease in strength due to the accompanying stress is prevented.
【０００８】[0008]
【図１】本考案の第１の実施例を示す。FIG. 1 shows a first embodiment of the present invention.
【図２】本考案の第２の実施例を示す。FIG. 2 shows a second embodiment of the present invention.
【図３】本考案の第３の実施例を示す。FIG. 3 shows a third embodiment of the present invention.
【図４】従来の技術による樹脂材製品用成形型の一例を
示す。FIG. 4 shows an example of a conventional molding die for resin material products.
【図５】図４の成形型による製品における不具合の状況
を示す部分平面図である。5 is a partial plan view showing a situation of a defect in a product produced by the molding die of FIG.
１ ボス部 ２ 貫通孔 ３ 切欠き部 ４ ゲート部 ５ ウェルド部 1 Boss 2 Through hole 3 Notch 4 Gate 5 Weld
Claims (1)
（３）を付された樹脂製品を射出成形する樹脂製品用成
形型において、前記ボス部（１）に連なって成形材料を
注入されるゲート部（４）の前記切欠き部（３）側の外
周を外方へ拡張させて、前記ボス部（１）の前記切欠き
部（３）を挟む部分に連なる前記ゲート部（４）の径方
向の肉厚（Ｌ1 ）を前記ボス部（１）の周辺部に連なる
前記ゲート部（４）の部分の径方向の肉厚（Ｌ３）の80
〜120 ％の範囲に設定されていることを特徴とする樹脂
製品用成形型。1. A resin product molding die for injection-molding a resin product having a cutout portion (3) in a through hole (2) of the boss portion (1), which is formed continuously with the boss portion (1). The gate is formed by expanding the outer periphery of the gate portion (4), into which the material is injected, on the side of the cutout portion (3) and connecting to the portion of the boss portion (1) sandwiching the cutout portion (3). The radial thickness (L 1 ) of the portion (4) is equal to the radial thickness (L3) of the gate portion (4) which is continuous with the peripheral portion of the boss portion (1).
Mold for resin products characterized by being set in the range of ~ 120%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992024139U JP2572293Y2 (en) | 1992-03-23 | 1992-03-23 | Mold for resin products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992024139U JP2572293Y2 (en) | 1992-03-23 | 1992-03-23 | Mold for resin products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0576718U true JPH0576718U (en) | 1993-10-19 |
| JP2572293Y2 JP2572293Y2 (en) | 1998-05-20 |
Family
ID=12129991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992024139U Expired - Lifetime JP2572293Y2 (en) | 1992-03-23 | 1992-03-23 | Mold for resin products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2572293Y2 (en) |
-
1992
- 1992-03-23 JP JP1992024139U patent/JP2572293Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2572293Y2 (en) | 1998-05-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0431483B2 (en) | ||
| JPH0576718U (en) | Mold for resin products | |
| JPH05141462A (en) | Tube-shaped vibration-proof rubber | |
| JPH06323336A (en) | Manufacture of thrust washer for universal joint | |
| JP3131707B2 (en) | Method for manufacturing resin molded article having insert fitting | |
| JP3621009B2 (en) | Synthetic resin molded gear | |
| JPS59194829A (en) | Manufacture of cast tire | |
| JP3215930B2 (en) | Method of vulcanizing and bonding rubber to metal fittings | |
| JPH028744Y2 (en) | ||
| JP3563466B2 (en) | Resin molding | |
| JP3607520B2 (en) | Sealing material and manufacturing method thereof | |
| JPH0671117A (en) | Oil strainer and manufacture of the same | |
| JP2649067B2 (en) | Manufacturing method of sealing device | |
| JP2002200661A (en) | Disk-shaped synthetic resin molding | |
| JPS63186075A (en) | Valve box seat fixing structure | |
| JPS62227612A (en) | Manufacture of o-ring | |
| JPH0525922Y2 (en) | ||
| JPS62144843A (en) | Production of hollow spline shaft | |
| JP2001099334A (en) | Valve seat structure of butterfly valve | |
| JPH0715645Y2 (en) | Closed forging machine | |
| JP3065376B2 (en) | Mold molding, molding method thereof, and molding die | |
| JP2925564B2 (en) | Double molding method and double molding die | |
| JPH0624915U (en) | Rubber molding dies | |
| JPH066310B2 (en) | Baking-molded product manufacturing method | |
| JPH10128760A (en) | Production of elastic hollow member |