JPH0774646B2 - Bearing manufacturing method - Google Patents
Bearing manufacturing methodInfo
- Publication number
- JPH0774646B2 JPH0774646B2 JP63311509A JP31150988A JPH0774646B2 JP H0774646 B2 JPH0774646 B2 JP H0774646B2 JP 63311509 A JP63311509 A JP 63311509A JP 31150988 A JP31150988 A JP 31150988A JP H0774646 B2 JPH0774646 B2 JP H0774646B2
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- molecular weight
- molding
- injection molding
- weight polyethylene
- 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 - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
- F16C33/201—Composition of the plastic
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Sliding-Contact Bearings (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、工業用小型部品等の軸受に係わり、特に射出
成形による超高分子量ポリエチレン製の軸受の製造方法
に関する。The present invention relates to a bearing for small industrial parts and the like, and more particularly to a method for producing a bearing made of ultra-high molecular weight polyethylene by injection molding.
［従来の技術］ 分子量が100万〜600万の超高分子量ポリエチレンは耐薬
品性、耐衝撃性及び耐寒性に優れると共に自己潤滑性を
有するため、軸受等の工業用小型部品の材料として極め
て適している。超高分子量ポリエチレンによって工業用
小型部品を成形する手段として、切削加工、射出成形、
圧縮成形及び押出成形が考えられるが、超高分子量ポリ
エチレンは前述したように分子量が極めて高いため、加
熱しても粘性が低くならず、流動性を示さない。このた
め一般的な射出成形を行っても、キャビティに超高分子
量ポリエチレンを充填させることができず、精度が劣り
且つ成形品の表面を平滑な物にすることができない。[Prior art] Ultra-high molecular weight polyethylene with a molecular weight of 1-6 million is excellent in chemical resistance, impact resistance and cold resistance, and has self-lubricating properties, so it is extremely suitable as a material for small industrial parts such as bearings. ing. As a means to mold small industrial parts with ultra high molecular weight polyethylene, cutting, injection molding,
Although compression molding and extrusion molding can be considered, since ultrahigh molecular weight polyethylene has an extremely high molecular weight as described above, the viscosity does not decrease even when heated and does not show fluidity. For this reason, even if general injection molding is performed, the cavity cannot be filled with the ultra-high molecular weight polyethylene, the precision is poor, and the surface of the molded product cannot be made smooth.
また、射出成形機のスクリューで超高分子量ポリエチレ
ンの可塑化する場合には、高シェアがかかり、加熱によ
る酸化及び剪断力による主鎖の切断が生じ分子量が低下
してしまう。したがって、超高分子量ポリエチレンを材
料とした軸受は従来切削加工により行われていた。この
ため摺動面が平滑で高精度の成形品を効率よく、しかも
安価に得ることができなかった［参考文献：プラスチッ
クス、vol37、NO.1、P163（1986）］。In addition, when the ultrahigh molecular weight polyethylene is plasticized by the screw of the injection molding machine, a high share is applied, and oxidation due to heating and cutting of the main chain due to shearing force occur, resulting in a decrease in molecular weight. Therefore, bearings made of ultra-high molecular weight polyethylene have been conventionally cut. For this reason, it was not possible to efficiently and inexpensively obtain a molded product with a smooth sliding surface and high precision [Reference: Plastics, vol37, NO.1, P163 (1986)].
［発明が解決しようとする課題］ 従来の超高分子量ポリエチレンを用いた軸受の射出成形
では、金型31の形状は、第６図に示すように、両開口部
はキャビティ31bと内径コア31cにより形成される。成形
終了後には第７図に示すように、軸受32の両開口部が変
形し突起部32aが形成され、軸受32の開口部よりの軸の
挿入を妨げるという問題があった。[Problems to be Solved by the Invention] In conventional injection molding of bearings using ultra-high molecular weight polyethylene, as shown in FIG. 6, the shape of the mold 31 is such that both openings are formed by the cavity 31b and the inner diameter core 31c. It is formed. After the completion of molding, as shown in FIG. 7, both openings of the bearing 32 are deformed to form protrusions 32a, which hinders the insertion of the shaft through the openings of the bearing 32.
本発明は上記問題を解決するものであって、種々の研究
の結果、軸受成形用金型の内径摺動面の両端開口部を広
げることによって、超高分子量ポリエチレンを用いた軸
受の射出成形においても、軸受の開口部からの軸の挿入
を容易にすることを目的とする。The present invention has been made to solve the above-mentioned problems, and as a result of various researches, in injection molding of a bearing using ultra-high molecular weight polyethylene, by widening the openings at both ends of the inner diameter sliding surface of the bearing molding die. Also aims to facilitate the insertion of the shaft through the opening of the bearing.
［課題を解決するための手段］ そのために本発明は、射出成形により軸受を成形する製
造方法において、軸受材料は分子量100万〜600万の超高
分子量ポリエチレンであり自己潤滑性を有する材料であ
って、金型は、両端開口部に傾斜拡径部を形成し、その
傾斜拡径部の軸方向の長さを、軸受の軸受長の0.1〜20
％とし、また、傾斜拡径部の開口部の径方向の長さを軸
受の軸径の100.1〜120％とするキャビティを有すること
を特徴とするものである。[Means for Solving the Problems] Therefore, in the present invention, in a manufacturing method of molding a bearing by injection molding, the bearing material is ultra-high molecular weight polyethylene having a molecular weight of 1 to 6 million and is a self-lubricating material. Then, the mold has an inclined expanded portion at the openings at both ends, and the axial length of the inclined expanded portion is set to 0.1 to 20 of the bearing length of the bearing.
%, And has a cavity in which the radial length of the opening of the inclined expanded portion is 100.1 to 120% of the shaft diameter of the bearing.
［作用］ 上記の本発明において問題点を解決すべく取られた技術
は、成形後の収縮にも影響がなく、軸受の寸法、精度を
落とすことはない。また、軸受に軸を挿入する場合も容
易に行えるものである。[Operation] The technique taken to solve the problems in the present invention described above does not affect the shrinkage after molding, and does not reduce the dimensions and accuracy of the bearing. In addition, the shaft can be easily inserted into the bearing.
［実施例］ 以下、本発明の実施例を図面を参照しつつ説明する。Embodiments Embodiments of the present invention will be described below with reference to the drawings.
本発明においては、従来の技術において問題点であった
軸受開口部の両端における変形を解決するために、第２
図に示す金型21を使用し、第１図に示す形状の軸受22を
成形するものである。In the present invention, in order to solve the deformation at both ends of the bearing opening, which is a problem in the conventional technique,
A die 22 shown in the figure is used to mold a bearing 22 having the shape shown in FIG.
すなわち、第１図において軸受22の形状は、軸受22の両
端開口部に傾斜拡径部22aを形成する。そして、この傾
斜拡径部22aの軸方向の長さL1を、軸受22の軸受Ｌの0.1
〜20％とし、また、傾斜拡径部22aの開口部の径方向の
長さD1を、軸受22の軸径Ｄの100.1〜120％とすることに
より、上記の問題点であった軸受開口部の両端における
変形をなくすことができ、軸の挿入を容易にすることが
出来た。That is, the shape of the bearing 22 in FIG. Then, the axial length L 1 of the inclined expanded portion 22a is set to 0.1 of the bearing L of the bearing 22.
And 20%, also, the radial length D 1 of the opening of the inclined enlarged diameter portion 22a, by a 100.1 to 120% of the shaft diameter D of the bearing 22, bearing openings were problems in the It was possible to eliminate the deformation at both ends of the part and facilitate the insertion of the shaft.
上記軸受22を成形するための金型21において、21aは固
定側型板、21bは可動側型板、21cは可動側内径コア、21
dは固定側内径コアを示す。そして、可動側内径コア21c
および固定側内径コア21dの軸受両端開口部にあたる部
分には、前記傾斜拡径部22aに相当する形状とされる。In the mold 21 for molding the bearing 22, 21a is a fixed side mold plate, 21b is a movable side mold plate, 21c is a movable side inner diameter core, 21
d indicates the fixed side inner diameter core. And the movable side inner diameter core 21c
Also, a portion of the fixed-side inner diameter core 21d that corresponds to the openings at both ends of the bearing has a shape corresponding to the inclined enlarged diameter portion 22a.
第３図は本発明で用いる射出成形機を示し、１はスクリ
ュー、２はシリンダ、2aはフィーダ部、2bは圧縮部、2c
はノズル部、３は超高分子量ポリエチレン原料、４はホ
ッパー、５はキャビティ、６は金型、７は真空タンク、
８は真空用ロータリーポンプ、９は雰囲気ガス供給用パ
イプ、13はヒータ、15は真空路を示している。FIG. 3 shows an injection molding machine used in the present invention, 1 is a screw, 2 is a cylinder, 2a is a feeder part, 2b is a compression part, and 2c.
Is a nozzle portion, 3 is an ultra high molecular weight polyethylene raw material, 4 is a hopper, 5 is a cavity, 6 is a mold, 7 is a vacuum tank,
Reference numeral 8 is a vacuum rotary pump, 9 is an atmospheric gas supply pipe, 13 is a heater, and 15 is a vacuum passage.
成形方法は、先ず分子量300万の超高分子量ポリエチレ
ン原料３（三菱石油化学工業製）を射出成形機のホッパ
ー４に入れ、ホッパー下部の原料供給量調整用スリット
10aを全開とした。ここでスクリュー１は径25mm、圧縮
比を1.8、ピッチを18mm、L/Dを20とし、スクリューの回
転数は160rpmとした。また、シリンダー２のノズル部2c
（オープンノズル）の温度は220℃、圧縮部2bの温度は1
70℃とし、フィーダ部2aは加熱せず、成形中に測定した
ところ70℃〜100℃となっていた。更にホッパー４には
1.0／分の割合でチッ素ガスを流入せしめた。一方、
金型６の温度は70℃に設定した。なお、本発明に使用し
た射出成形方法については特開昭58−118484号公報に詳
細に述べてあるのでここでは省略する。The molding method is as follows: First, put the ultra-high molecular weight polyethylene raw material 3 (made by Mitsubishi Petrochemical Co., Ltd.) with a molecular weight of 3 million into the hopper 4 of the injection molding machine, and slit the raw material supply amount under the hopper.
10a was fully opened. Here, the screw 1 had a diameter of 25 mm, a compression ratio of 1.8, a pitch of 18 mm, an L / D of 20, and a screw rotation speed of 160 rpm. Also, the nozzle portion 2c of the cylinder 2
The temperature of the (open nozzle) is 220 ℃, the temperature of the compression part 2b is 1
The temperature was 70 ° C, the feeder 2a was not heated, and the temperature was 70 ° C to 100 ° C when measured during molding. Furthermore, in hopper 4
Nitrogen gas was introduced at a rate of 1.0 / min. on the other hand,
The temperature of the mold 6 was set to 70 ° C. The injection molding method used in the present invention is described in detail in Japanese Patent Application Laid-Open No. 58-118484 and will not be described here.
第４図および第５図はその成形例を示し、軸受成形品寸
法は、Φ１＝16.00mm、Φ２＝14.40mm、T1＝5.80mm、T2
＝1.80mm、Φ３＝19.86mm、内径8.15mmの小型軸受をサ
イドゲート（ゲート幅1.0mm、ゲート深さ0.8mm、ランド
長1.5mm）で成形した。更に、成形条件は射出時間を0.8
秒、保圧時間５秒、冷却時間を10秒、インターバル３
秒、全体のサイクルを22.3秒とした。FIGS. 4 and 5 show the molded example, bearing moldings dimensions, Φ1 = 16.00mm, Φ2 = 14.40mm , T 1 = 5.80mm, T 2
= 1.80 mm, Φ3 = 19.86 mm, inner diameter 8.15 mm, small bearings were molded with side gates (gate width 1.0 mm, gate depth 0.8 mm, land length 1.5 mm). Furthermore, the molding condition is that the injection time is 0.8
Seconds, holding time 5 seconds, cooling time 10 seconds, interval 3
Second, the total cycle was 22.3 seconds.
このようにして得られた軸受の内径に軸を挿入したとこ
ろ、従来の技術で成形した成形品よりも容易に軸を挿入
することができた。When the shaft was inserted into the inner diameter of the bearing thus obtained, the shaft could be inserted more easily than the molded product molded by the conventional technique.
［発明の効果］ 以上の説明から明らかなように、本発明により製造され
た軸受は、特定の超高分子量ポリエチレンを射出成形に
より成形した軸受における問題点、すなわち軸受の両端
開口部に突起部が形成され軸の挿入を妨げるという問題
を解決することができ、軸受内に軸を容易に挿入するこ
とができる。また、射出成形により、高精度の軸受を容
易に製造することができ、得られた軸受は自己潤滑性を
有するため給油が不要であり、真空中、水中での使用も
可能となる。[Effects of the Invention] As is apparent from the above description, the bearing manufactured according to the present invention has a problem in a bearing formed by injection molding of a specific ultra-high molecular weight polyethylene, that is, a protrusion is formed in the opening at both ends of the bearing. The problem of being formed and impeding the insertion of the shaft can be solved and the shaft can be easily inserted into the bearing. Further, by injection molding, it is possible to easily manufacture a high-precision bearing, and since the obtained bearing has self-lubricating property, oiling is unnecessary, and it can be used in vacuum or in water.
第１図は本発明により製造される軸受の例を示す断面
図、第２図は本発明で用いる金型の断面図、第３図は本
発明で用いる射出成形機の概略図、第４図は本発明によ
り成形される軸受の形状例を示す平面図、第５図は第４
図の側面図、第６図は従来の軸受を成形するための金型
の断面図、第７図は従来の軸受の断面図である。 21……金型、21a、21b……治具、21c……コアピン、22
……軸受 22a……傾斜拡径部、23……キャビティ、Ｌ……軸受
長、Ｄ……軸径FIG. 1 is a sectional view showing an example of a bearing manufactured by the present invention, FIG. 2 is a sectional view of a mold used in the present invention, FIG. 3 is a schematic view of an injection molding machine used in the present invention, and FIG. Is a plan view showing an example of the shape of a bearing molded according to the present invention, and FIG.
FIG. 6 is a side view of the drawing, FIG. 6 is a sectional view of a mold for molding a conventional bearing, and FIG. 7 is a sectional view of a conventional bearing. 21 …… Mold, 21a, 21b …… Jig, 21c …… Core pin, 22
...... Bearing 22a …… Inclined expansion part, 23 …… Cavity, L …… Bearing length, D …… Shaft diameter
Claims (1)
おいて、軸受材料は分子量100万〜600万の超高分子量ポ
リエチレンであり自己潤滑性を有する材料であって、金
型は、両端開口部に傾斜拡径部を形成し、その傾斜拡径
部の軸方向の長さを、軸受の軸受長の0.1〜20％とし、
また、傾斜拡径部の開口部の径方向の長さを軸受の軸径
の100.1〜120％とするキャビティを有することを特徴と
する軸受の製造方法。1. A manufacturing method for molding a bearing by injection molding, wherein the bearing material is an ultra-high molecular weight polyethylene having a molecular weight of 1 to 6 million and a self-lubricating material, and the mold has openings at both ends. An inclined expanded portion is formed, and the axial length of the inclined expanded portion is set to 0.1 to 20% of the bearing length of the bearing,
A method of manufacturing a bearing, further comprising a cavity having a radial length of an opening of the inclined expanded portion of 100.1 to 120% of a shaft diameter of the bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63311509A JPH0774646B2 (en) | 1988-12-09 | 1988-12-09 | Bearing manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63311509A JPH0774646B2 (en) | 1988-12-09 | 1988-12-09 | Bearing manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02159410A JPH02159410A (en) | 1990-06-19 |
| JPH0774646B2 true JPH0774646B2 (en) | 1995-08-09 |
Family
ID=18018091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63311509A Expired - Lifetime JPH0774646B2 (en) | 1988-12-09 | 1988-12-09 | Bearing manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0774646B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6317057B2 (en) * | 2012-08-08 | 2018-04-25 | Ntn株式会社 | Plain bearing |
| JP6271870B2 (en) * | 2013-06-03 | 2018-01-31 | キヤノン株式会社 | Manufacturing method of resin roller shaft, molding die and roller shaft |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59116629U (en) * | 1983-01-27 | 1984-08-07 | トヨタ自動車株式会社 | resin bearing |
| JPS59194841A (en) * | 1983-04-21 | 1984-11-05 | 旭化成株式会社 | Extra-high molecular weight polyethylene composite sheet |
| JPH0641768B2 (en) * | 1984-04-17 | 1994-06-01 | 松下電器産業株式会社 | Processing method of sliding bearing |
| JPS6391723U (en) * | 1986-12-04 | 1988-06-14 |
-
1988
- 1988-12-09 JP JP63311509A patent/JPH0774646B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02159410A (en) | 1990-06-19 |
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