CN105643863A - Injection-molding preparation method for plastic angular contact ball bearing retainer and special mold for injection-molding preparation method - Google Patents
Injection-molding preparation method for plastic angular contact ball bearing retainer and special mold for injection-molding preparation method Download PDFInfo
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- CN105643863A CN105643863A CN201410642235.0A CN201410642235A CN105643863A CN 105643863 A CN105643863 A CN 105643863A CN 201410642235 A CN201410642235 A CN 201410642235A CN 105643863 A CN105643863 A CN 105643863A
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- angular contact
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- contact ball
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Abstract
The invention aims to provide a method for preparing an angular contact ball bearing from plastic composite materials through injection molding and a special mold for the method. The method specifically comprises the steps that (1) the mold is designed; (2) particles or powder of the plastic composite materials is placed into a charging barrel of an injection molding machine, the particles or powder of the plastic composite materials is heated, compressed, sheared, mixed and conveyed so as to be uniformly molten, pressure is applied to the melt by means of a plunger or a screw, the high-temperature melt is injected into a well closed mold cavity through a nozzle in front of the charging barrel and a sprue system of the mold so as to be cooled and shaped, the mold is opened, and the high-temperature melt is ejected out, so that an angular contact bearing retainer is obtained; and (3) the angular contact bearing retainer which is stable in shape and dimension is obtained through heat treatment and annealing treatment. The retainer manufactured through the method has the characteristics of being quite high in mechanical strength, good in abrasion resistance and corrosion resistance, high in dimension precision, smooth in surface, easy to machine, high in production efficiency, capable of saving materials and the like and can be adapted to the severe using conditions of high rotating speed, high precision and the like.
Description
Technical field
The present invention relates to angular contact ball bearing cage, the injection molding process of a kind of plastics angular contact ball bearing cage and special injection forming mold thereof are provided especially.
Background technology
Angular contact ball bearing can bear radial load and axial load simultaneously, can work at higher rotational speeds. Contact angle is more big, and axial carrying capacity is more high, and high accuracy and high-speed bearing generally take 15 �� of contact angles. Can be used for high frequency motors, centrifugal separator etc. High Speed Precision Angular Contact Ball Bearing, is mainly used in the high speed rotating occasion that load is lighter, it is desirable to bearing has high accuracy, high rotating speed, the low vibration of low-temperature-rise and certain service life. The supporting member mounted in pairs often making high-speed electric main shaft uses, and is the crucial auxiliary equipment of internal surface grinding machine high-speed electric main shaft.
The performance of retainer and reliability of operation are to ensure that one of key of bearing normal operation. The retainer major part that the angular contact ball bearing that current China bearing industry produces uses all adopts phenolic aldehyde laminated cloth material. Phenolic aldehyde laminated cloth density of material is little, mechanical strength is higher, machining property good, have certain heat resisting temperature and the performance such as oil suction, permeability, is widely used in manufacturing the retainer of internal diameter 2��200mm angular contact ball bearing in China. But, when bearing works under high speed conditions, it is desirable to retainer can bear higher moment of torsion, stretching resistance, frictional force, and now existing phenolic aldehyde laminated cloth material will be unable to meet requirement. It addition, adopt grading method boring during phenolic aldehyde laminated cloth retainer processing steel ball pocket hole, this method error is bigger, pitch-row error can be caused big, and hole tolerance is big, and each hole parallel error is bad, not reaching high accuracy dimensional requirement and production efficiency is not high, materials'use rate is low. The retainer made due to phenolic aldehyde laminated cloth has certain limitation in use, and developed countries no longer it can be used as the materials'use producing retainer. More external companies are all using plastic cage now in a large number, and in service life compared with domestic phenolic aldehyde laminated cloth retainer, the aspect such as running accuracy all exists greater advantage.
Plastics and composite thereof have the advantage that as retainer material
(1), proportion is little, wear-resistant, corrosion-resistant, radiation hardness, good toughness, can antidetonation, solid foreign materials can be embedded into, noise is low, realize intensity and elastic perfect adaptation, steel surface in lubrication has good sliding capability, extremely low frictional force, so that the abrasion of bearing and heating are maintained at minimum level;
(2), easy to process, can structure that directly injection mo(u)lding is complicated;
(3), the inertia of low density material low, even if when lacking lubricant, plastic cage also still has excellent runnability, even therefore bearing continuous operation there will not be stuck and secondary damage risk;
(4), plastic cage can hold rolling element more, that size is bigger when identical appearance size and cross section, thus improving the bearing capacity of bearing,
In recent years, the domestic all kinds of retainer products using the engineering plastics such as PA, PTFE, PPS, PEEK, PI and composite thereof to make that also in succession have developed, but there is not been reported to use the angular contact bearing holder that plastic composite injection mo(u)lding makes.
Injection mo(u)lding refers at a certain temperature, by the plastic material that helical screw agitator melts completely, injects mold cavity with high pressure, after cooled solidification, and the method obtaining products formed. In the process of injection mo(u)lding, the design of mould will directly affect quality and the precision of final products. Owing to structure of angular contact ball bearing retainer is complicated, product size required precision is high, and its Design of Dies exists following difficult point:
1, being difficult to ensure that accurate calibration, the centre-to-centre spacing making each circular hole is equal;
2, the size and shape of loosing core being typically designed, it is difficult to ensure the unification of each circular hole size and shape;
3, owing to mould structure is complicated, loose core more, the problem that therefore there is demoulding difficulty;
4, the design of gate location is unreasonable, it may be difficult to the flowing keeping melt is smooth and easy.
The existence of problem above, causes that injection mo(u)lding manufactures angular contact ball bearing plastic cage and is difficult to, thus constraining the development of high accuracy angular contact ball bearing plastic cage.
Summary of the invention
It is an object of the invention to provide a kind of method and particular manufacturing craft thereof being prepared angular contact ball bearing by plastic composite through injection mo(u)lding. Adopting the retainer obtained by the method to have higher mechanical strength, good wearability and corrosion resistance, dimensional accuracy is high, smooth surface, it is easy to processing, production efficiency is high, save the features such as material, it is possible to adapt to the use under the harsh conditions such as high rotating speed high accuracy.
The present invention specifically provides the injection molding process of a kind of plastics angular contact ball bearing cage, it is characterised in that adopting plastic composite to prepare angular contact ball bearing cage by injection molding forming method, detailed process is:
(1) the angular contact bearing holder mould of corresponding size, is designed as required;
(2), the pellet of plastic composite or powder are put into the barrel of injection machine, through heating, compression, shear, mixing and conveying so that it is melt uniformly; Apply pressure by plunger or screw rod to melt, make high-temperature fusant be injected in the die cavity closed by the runner system of the nozzle before barrel and mould, cooled sizing, opening mold, eject, obtain angular contact bearing holder;
(3), thermally treated, annealing obtain the angular contact bearing holder that geomery is stable.
The injection molding process of plastics angular contact ball bearing cage of the present invention, it is characterized in that: described plastic composite refers mainly to engineering plastics (preferred nylon, polyphenylene sulfide, polyether-ether-ketone, polyimides etc.) and composite thereof, and described retainer is the plastics angular contact ball bearing cage in straight hole or pocket hole.
Present invention also offers the particular manufacturing craft of plastics angular contact ball bearing cage injection molding process, described mould includes solid plate 1, moving platen 2, runner 3, runner mouth 31, pulled core structure 4, cast gate 5 and die cavity 6;
Multiple cylindrical pulled core structures 4 are slidably connected with moving platen 2, and the extended line of each pulled core structure 4 is each through the center of circle of moving platen 2, and during use, all pulled core structures 4 one end in mould can surround circle but two neither contacts; Being additionally provided with one on the center of circle of moving platen 2 and dam 3, runner 3 is respectively arranged at the two ends with a cast gate 5; Solid plate 1 is arranged on moving platen 2 and is equipped with the side of pulled core structure 4, and position corresponding with runner 3 on solid plate 1 is provided with runner mouth 31; The space that solid plate 1, moving platen 2 and pulled core structure 4 surround constitutes die cavity 6.
Mould of the present invention, it is characterised in that: described pulled core structure 4 is additionally provided with carriage, including angled-lift splits 7, guide pillar 8; The movement of moving platen 2 during along with mould open/close, guide pillar 8 also can move, and drives angled-lift splits 7 to slide, and then drives the slip of pulled core structure 4, it is achieved looses core.
Mould of the present invention, it is characterised in that: in described mould, the width of runner 3 is the 1/3��1 of die cavity 6 thickness, and optimal design width is 2/3.
Mould of the present invention, it is characterised in that: in described mould, runner 3 is yi word pattern, cross or rice font runner, it is possible to select design according to the size of specific product size.
Particular manufacturing craft provided by the invention overcomes the difficult point existed in Injection Mold Design, achieve the injection mo(u)lding of angular contact bearing plastic cage, compare with the conventional machining process adopting grading method Drilling operation steel ball pocket hole, adopt the angular contact bearing plastic cage that this mould produces can reach degree of precision, achieve the production automation, improve production efficiency.
Beneficial effect:
Compared with phenolic aldehyde laminated cloth material, plastic composite can meet the physical property in precision bearing height revolution situation. There is high mechanical strength, good wearability and corrosion resistance, dimensionally stable.
This kind of angular contact ball bearing cage adopts injection molding forming method to manufacture, retainer is once moulded and is formed shape, product surface is smooth, coefficient of friction is low, all dimensional accuracies, and geometric accuracy is attained by high standard requirement, without machining, production efficiency is high, and bearing is easy to assembly, it is easy to realize Automated condtrol.
Adopt the angular contact bearing holder that plastic composite injection mo(u)lding prepares to can adapt to the use under the harsh conditions such as high rotating speed high accuracy, meet the instructions for use of high accuracy angular contact bearing.
Accompanying drawing explanation
The plastic composite angular contact ball bearing cage schematic diagram of Fig. 1 injection mo(u)lding.
The structure chart of Fig. 2 angular contact ball bearing plastic cage mould.
Fig. 3 removes the interior views of solid plate 1 rear mold.
Fig. 4 pulled core structure 4 carriage schematic diagram.
In figure: 1-solid plate; 2-moving platen; 3-runner; 31-runner mouth; 4-pulled core structure; 5-cast gate; 6-die cavity; 7-angled-lift splits; 8-guide pillar.
Detailed description of the invention
The structure of injection mold used by the embodiment of the present invention is: such as Fig. 2��4, this mould includes solid plate 1, moving platen 2, runner 3, pulled core structure 4, cast gate 5 and die cavity 6;
Plurality of cylindrical pulled core structure 4 is slidably connected with moving platen 2, and the extended line of each pulled core structure 4 is each through the center of circle of moving platen 2; Being additionally provided with one on the center of circle of moving platen 2 and dam 3, runner 3 is a groove, and it is respectively arranged at the two ends with a cast gate 5 (sectional area of cast gate 5 less than the sectional area of runner 3, to remove redundance after facilitating molding); Solid plate 1 is arranged on moving platen 2 and is equipped with the side of pulled core structure 4, and position corresponding with runner 3 on solid plate 1 is provided with runner mouth 31;The space that solid plate 1, moving platen 2 and pulled core structure 4 surround constitutes an annular die cavity 6, and the width of runner 3 is the 2/3 of die cavity 6 thickness.
Pulled core structure 4 is additionally provided with carriage, and including angled-lift splits 7 and guide pillar 8, the movement of moving platen 2 during along with mould open/close, guide pillar 8 also can move, and drives angled-lift splits 7 to slide, and then drives the slip of pulled core structure 4, it is achieved looses core. During use, all pulled core structures 4 one end in mould surrounds circle but two neither contacts, injected plastics material injects runner 3 by runner mouth 31, and enter die cavity 6 by cast gate 5, and after cooled sizing, opening mold, pulled core structure 4 is extracted out, namely on molding structure, form angular contact ball bearing plastic cage steel ball pocket hole, remove the redundance formed because of runner 3, angular contact ball bearing plastic cage can be obtained.
Embodiment 1
1. design the angular contact bearing holder mould of corresponding size as required;
2. the pellet of 20% carbon fiber reinforced nylon 66 is put into the barrel of injection machine, through 275 DEG C of heating temperatures so that it is melt uniformly; Apply 110MPa pressure by plunger or screw rod to melt, make high-temperature fusant be injected into by the runner system of the nozzle before barrel and mould in the die cavity 6 closed, cooled sizing, opening mold, eject, knock out redundance, obtain retainer;
3. heat treatment: annealing 5 hours to process through 120 DEG C obtains the stable carbon fiber of geomery/nylon 66 composite material angular contact bearing holder.
Embodiment 2
1. design the angular contact bearing holder mould of corresponding size as required;
2. the pellet of 10% glass fiber reinforced polyester ether ether ketone is put into the barrel of injection machine, through 380 DEG C of heating temperatures so that it is melt uniformly; Apply 60MPa pressure by plunger or screw rod to melt, make high-temperature fusant be injected into by the runner system of the nozzle before barrel and mould in the die cavity 6 closed, cooled sizing, opening mold, eject, knock out redundance, obtain retainer;
3. heat treatment: annealing 6 hours to process through 160 DEG C obtains the glass fibre/polyetheretherketonecomposite composite material angular contact bearing holder that geomery is stable.
Embodiment 3
1. design the angular contact bearing holder mould of corresponding size as required;
2. the pellet of 10% fibre reinforced polyphenylene sulfide is put into the barrel of injection machine, through 350 DEG C of heating temperatures so that it is melt uniformly; Apply 80MPa pressure by plunger or screw rod to melt, make high-temperature fusant be injected into by the runner system of the nozzle before barrel and mould in the die cavity 6 closed, cooled sizing, opening mold, eject, knock out redundance, obtain retainer;
3. heat treatment: annealing 6 hours to process through 120 DEG C obtains the stable carbon fiber of geomery/polyphenyl thioether composite material angular contact bearing holder.
Above-described embodiment only for technology design and the feature of the present invention are described, its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this, can not limit the scope of the invention with this. All equivalences made according to spirit of the invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (8)
1. the injection molding process of a plastics angular contact ball bearing cage, it is characterised in that adopting plastic composite to prepare angular contact ball bearing cage by injection molding forming method, detailed process is:
(1) the angular contact bearing holder mould of corresponding size, is designed as required;
(2), the pellet of plastic composite or powder are put into the barrel of injection machine, through heating, compression, shear, mixing and conveying so that it is melt uniformly; Apply pressure by plunger or screw rod to melt, make high-temperature fusant be injected in the die cavity closed by the runner system of the nozzle before barrel and mould, cooled sizing, opening mold, eject, obtain angular contact bearing holder;
(3), thermally treated, annealing obtain the angular contact bearing holder that geomery is stable.
2. the injection molding process of plastics angular contact ball bearing cage described in claim 1, it is characterised in that: described plastic composite is nylon, polyphenylene sulfide, polyether-ether-ketone or polyimides.
3. the injection molding process of plastics angular contact ball bearing cage described in claim 1, it is characterised in that: described retainer is the plastics angular contact ball bearing cage in straight hole or pocket hole.
4. the particular manufacturing craft of method described in a claim 1, it is characterised in that: described mould includes solid plate (1), moving platen (2), runner (3), runner mouth (31), pulled core structure (4), cast gate (5) and die cavity (6);
Multiple cylindrical pulled core structures (4) are slidably connected with moving platen (2), the extended line of each pulled core structure (4) is each through the center of circle of moving platen (2), and during use, all pulled core structures (4) one end in mould can surround circle but two neither contacts; Being additionally provided with one on the center of circle of moving platen (2) to dam (3), runner (3) is respectively arranged at the two ends with a cast gate (5); Solid plate (1) is arranged on moving platen (2) and is equipped with the side of pulled core structure (4), and the upper position corresponding with runner (3) of solid plate (1) is provided with runner mouth (31); The space that solid plate (1), moving platen (2) and pulled core structure (4) surround constitutes die cavity (6).
5. particular manufacturing craft described in claim 4, it is characterised in that: described pulled core structure (4) is additionally provided with carriage, including angled-lift splits (7), guide pillar (8); The movement of moving platen (2) during along with mould open/close, guide pillar (8) is and then mobile, drives angled-lift splits (7) to slide, and then drives the slip of pulled core structure (4), it is achieved looses core.
6. particular manufacturing craft described in claim 1, it is characterised in that: in described mould, the width of runner (3) is the 1/3��1 of die cavity (6) thickness.
7. particular manufacturing craft described in claim 1 or 3, it is characterised in that: in described mould, the width of runner (3) is the 2/3 of die cavity (6) thickness.
8. particular manufacturing craft described in claim 1, it is characterised in that: in described mould runner (3) be yi word pattern, cross or rice font runner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410642235.0A CN105643863A (en) | 2014-11-14 | 2014-11-14 | Injection-molding preparation method for plastic angular contact ball bearing retainer and special mold for injection-molding preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410642235.0A CN105643863A (en) | 2014-11-14 | 2014-11-14 | Injection-molding preparation method for plastic angular contact ball bearing retainer and special mold for injection-molding preparation method |
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| CN105643863A true CN105643863A (en) | 2016-06-08 |
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| CN201410642235.0A Pending CN105643863A (en) | 2014-11-14 | 2014-11-14 | Injection-molding preparation method for plastic angular contact ball bearing retainer and special mold for injection-molding preparation method |
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Cited By (3)
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| CN108757738A (en) * | 2018-07-10 | 2018-11-06 | 宜兴启明星物联技术有限公司 | Retainer and its production method and bearing |
| CN115008692A (en) * | 2022-01-14 | 2022-09-06 | 台州学院 | Method for accurately forming hot runner of PEEK high-end bearing plastic retainer |
| CN115008693A (en) * | 2022-01-14 | 2022-09-06 | 台州学院 | Cold runner molding method of PEEK high-end bearing plastic retainer |
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Cited By (3)
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|---|---|---|---|---|
| CN108757738A (en) * | 2018-07-10 | 2018-11-06 | 宜兴启明星物联技术有限公司 | Retainer and its production method and bearing |
| CN115008692A (en) * | 2022-01-14 | 2022-09-06 | 台州学院 | Method for accurately forming hot runner of PEEK high-end bearing plastic retainer |
| CN115008693A (en) * | 2022-01-14 | 2022-09-06 | 台州学院 | Cold runner molding method of PEEK high-end bearing plastic retainer |
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