CN109808114A - A kind of bearing holder material and preparation method thereof, bearing retainer and preparation method thereof - Google Patents
A kind of bearing holder material and preparation method thereof, bearing retainer and preparation method thereof Download PDFInfo
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- CN109808114A CN109808114A CN201811644097.4A CN201811644097A CN109808114A CN 109808114 A CN109808114 A CN 109808114A CN 201811644097 A CN201811644097 A CN 201811644097A CN 109808114 A CN109808114 A CN 109808114A
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Abstract
The present invention relates to a kind of bearing holder materials and preparation method thereof, bearing retainer and preparation method thereof, belong to technical field of bearings.The preparation method of bearing holder material of the invention, comprising the following steps: the raw material that main component is polyimides is provided；Plate composite polyimide material is made by the raw material is hot-forming, then by plate composite polyimide material be made it is rodlike to get.Bearing holder material tensile strength made of the preparation method of bearing holder material of the invention is high, wearability is good to protrude, and intensity and strength consistency are significantly better than the polyimide material made of traditional technique, especially have both two-fold advantage at low cost, that shaping efficiency is high, be conducive to expand the application range of polyimide material, and rodlike polyimide material is made again by the way that plate polyimide material is first made, significantly reduces and bearing retainer cost is produced using polyimide material.
Description
Technical field
The present invention relates to a kind of bearing holder materials and preparation method thereof, bearing retainer and preparation method thereof, belong to
Technical field of bearings.
Background technique
Polyimides keeps frame material to have high-low temperature resistant, high intensity, wear-resistant property, is excellent self-lubricating solid material
Material, is widely used as rolling bearing retainer.
As keeping the polyimides of frame material to be generally thermoplastic polyimide, price costly, in order to reduce material
Expect cost, frame material is kept to be generally tubular blank, forms the mold of use as shown in Fig. 2, including the housing 5 of tubular, column
Mandrel 6, the pedestal 7 of tubular and the formed punch 8 of tubular.Generally, which keeps usually adopting when frame material
With heat pressing process, though material cost decreases, there are fabrication cycle length, high energy consumption and efficiencies for the technique lowly, mold rapid wear
The disadvantages of consumption, for miniature small size bearing, cost of raw material accounting is lower, is protected using the polyimides of technique production
Frame material higher cost is held, limits polyimide material in the large-scale application in retainer field.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation methods of bearing holder material, can be improved bearing retainer material
The tensile strength of material.
The present invention also provides a kind of bearing holder materials of high tensile.
The present invention also provides bearing retainers of a kind of high tensile and preparation method thereof.
In order to achieve the goal above, technical solution used by the preparation method of bearing holder material of the invention are as follows:
A kind of preparation method of bearing holder material, comprising the following steps:
1) raw material that main component is polyimides is provided；
2) plate polyimide material is made by the raw material is hot-forming, stick then is made in plate polyimide material
Shape to get.
The preparation method of bearing holder material of the invention, simple process, gathering hot-forming manufactured plate
Acid imide material is machined out convenient for the rodlike polyimide material of special diameter small size is made, and since plate polyamides is sub-
Amine material is pressurized during hot-forming more evenly, so that manufactured bearing holder material tensile strength is high, wear-resisting property
Prominent, intensity and strength consistency are significantly better than the polyimide material made of traditional technique, especially have both cost
Two-fold advantage low, shaping efficiency is high is conducive to the application range for expanding polyimide material；Furthermore poly- by the way that plate is first made
Rodlike polyimide material is made again and keeps frame material to be mentioned with family of four mold production efficiency compared to tradition for acid imide material
10 times or more are risen, significantly reduces and bearing retainer cost is produced using polyimide material.
It is described it is hot-forming include: by raw material in 300~400kg/cm2Pressure under be warming up to 375 through 55~65min~
395 DEG C, then 60~120min of heat-insulation pressure keeping, cool down after heat-insulation pressure keeping and pressure maintaining, is down to 345~355 to temperature
DEG C when continue to cool down and pressurize that pressure is made to increase 100~200kg/cm in 5min2, the simultaneously pressure maintaining 15 that then proceedes to cool down~
25min, release.Substantially shortened using above-mentioned hot press forming technology pressing stroke, reduce pressure transmitting it is poor, tensile strength and
Consistency of performance is promoted.
In order to further increase the tensile strength of material, it is preferred that the raw material is mainly by the component of following parts by weight
Composition: 70~85 parts of polyimides, 15~20 parts of reinforcing agent；The reinforcing agent is glass fibre, in carbon fiber, graphene
Any one.
In order to further increase the wearability of material, it is preferred that the raw material further includes 5~10 parts of lubricant.
For the ease of being processed to plate polyimide material, it is preferred that plate polyimide material is made rodlike
Method include: that plate polyimide material first is cut to obtain strip polyimide material, then by strip polyimides
Material is machined out to obtain rodlike polyimide material.
The technical solution that bearing holder material of the invention uses are as follows:
Bearing holder material made from a kind of preparation method using above-mentioned bearing holder material.
Bearing holder material of the invention is made, so that it is strong with excellent stretching using above-mentioned preparation method
Degree and wearability, have widened the application range of polyimide material.
Technical solution used by bearing retainer preparation method of the invention are as follows:
1) raw material that main component is polyimides is provided；
2) plate polyimide material is made by the raw material is hot-forming, stick then is made in plate polyimide material
Shape polyimide material；
3) rodlike polyimide material obtained is subjected to machining and bearing retainer is made.
The preparation method of bearing retainer of the invention can not only improve the tensile strength and wearability of bearing retainer
It can, moreover it is possible to the efficiency of large-scale production is improved, and drops production cost, it is with good economic efficiency.
Preferably, it is described it is hot-forming include: by raw material in 300~400kg/cm2Pressure under through 55~65min heat up
To 375~395 DEG C, then 60~120min of heat-insulation pressure keeping cool down after heat-insulation pressure keeping and pressure maintaining, is down to temperature
Continue to cool down and pressurize at 345~355 DEG C that pressure is made to increase 100~200kg/cm in 5min2, then proceed to cooling and pressure maintaining
15~25min, release.Substantially shortened using above-mentioned hot press forming technology pressing stroke, it is poor to reduce pressure transmitting, so that drawing
It stretches intensity and consistency of performance is promoted.
In order to further increase the tensile strength of bearing retainer, it is preferred that the raw material is mainly by following parts by weight
Group be grouped as: 70~85 parts of polyimides, 15~20 parts of reinforcing agent；The reinforcing agent is glass fibre, carbon fiber, stone
Any one in black alkene.
The technical solution that bearing retainer of the invention uses are as follows:
Bearing retainer made from a kind of preparation method using above-mentioned bearing retainer.
Bearing retainer of the invention, using above-mentioned bearing holder material be made, tensile strength with higher and
Good wear-resisting property.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the plate framework mold used in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram that traditional handicraft prepares the tubular moulding mold that polyimides keeps frame material to use；
Appended drawing reference: 1- top board, 2- lower platen, 3- framework, 4- die cavity, 5- housing, 6- mandrel, 7- pedestal, 8- formed punch.
Specific embodiment
The preparation method of bearing holder material provided by the invention, comprising the following steps:
1) raw material that main component is polyimides is provided；
2) plate polyimide material is made by the raw material is hot-forming, stick then is made in plate polyimide material
Shape to get.
Preferably, used polyimides is thermoplastic polyimide.The thermoplastic polyimide is selected from monoether anhydride
One of type polyimides, bis ether acid anhydride type polyimides.Raw material can also contain other additions containing only polyimides
Agent, generally, the quality accounting of polyimides are not less than 60%.When mixture contains other additives in addition to polyimides, system
The plate polyimide material obtained is plate composite polyimide material.
In order to further enhance the tensile strength and wearability of material, it is preferred that the partial size of the raw material is not less than 200
Mesh.
Preferably, it is described it is hot-forming include: by raw material in 300~400kg/cm2Pressure under through 55~65min heat up
To 375~395 DEG C, then 60~120min of heat-insulation pressure keeping cool down after heat-insulation pressure keeping and pressure maintaining, is down to temperature
Continue to cool down and pressurize at 345~355 DEG C that pressure is made to increase 100~200kg/cm in 5min2, then proceed to cooling and pressure maintaining
15~25min, release.
Preferably, the heating rate of the heating is 5~8 DEG C/min.It is further preferred that the rate of the heating is
5.5~6.6 DEG C/min.
Preferably, described hot-forming using the mold with tabular die cavity；It is described it is hot-forming further include
Circumferential heating is carried out to the mold during heating and heat-insulation pressure keeping.The temperature circumferentially heated is 340~360 DEG C.It protects
Stop carrying out circumferential heating while warm pressure maintaining terminates.Preferably, circumferential heating starts simultaneously with heating, it is circumferential heat through 35~
45min is warming up to the temperature circumferentially heated.
Preferably, it is demoulded when temperature is lower than 220 DEG C after release.
Preferably, the raw material is mainly composed of the following parts by weight: 70~85 parts of polyimides, 15~20
The reinforcing agent of part；The reinforcing agent is glass fibre, carbon fiber, any one in graphene.
Preferably, the raw material further includes 5~10 parts of lubricant.The lubricant be polytetrafluoroethylene (PTFE), molybdenum disulfide,
One of graphite.
Preferably, the preparation method of the raw material includes: by polyimides, reinforcing agent and lubricant respectively 150~220
It is dried at DEG C, is then uniformly mixed.Preferably, the time of the drying process is 2~4h.
In order to improve the uniformity coefficient of raw material and shorten incorporation time, it is preferred that it is described be uniformly mixed be by polyimides,
Reinforcing agent and lubricant are with 0.5~1.0min of mixing speed stirring of 2000~3000rpm.
The preparation method of bearing retainer provided by the invention, comprising the following steps:
1) raw material that main component is polyimides is provided；
2) plate polyimide material is made by the raw material is hot-forming, stick then is made in plate polyimide material
Shape polyimide material；
3) rodlike polyimide material obtained is subjected to machining and bearing retainer is made.
Preferably, used polyimides is thermoplastic polyimide.
Preferably, the partial size of the raw material is not less than 200 mesh.
Preferably, it is described it is hot-forming include: by raw material in 300~400kg/cm2Pressure under through 55~65min heat up
To 375~395 DEG C, then 60~120min of heat-insulation pressure keeping cool down after heat-insulation pressure keeping and pressure maintaining, is down to temperature
Continue to cool down and pressurize at 345~355 DEG C that pressure is made to increase 100~200kg/cm in 5min2, then proceed to cooling and pressure maintaining
15~25min, release.
Preferably, the heating rate of the heating is 5~8 DEG C/min.It is further preferred that the rate of the heating is
5.5~6.6 DEG C/min.
Preferably, described hot-forming using the mold with tabular die cavity；It is described it is hot-forming further include
Circumferential heating is carried out to the mold during heating and heat-insulation pressure keeping.The temperature circumferentially heated is 340~360 DEG C.It protects
Stop carrying out circumferential heating while warm pressure maintaining terminates.Preferably, circumferential heating starts simultaneously with heating, it is circumferential heat through 35~
45min is warming up to the temperature circumferentially heated.
Preferably, it is demoulded when temperature is lower than 220 DEG C after release.
Preferably, the raw material is mainly composed of the following parts by weight: 70~85 parts of polyimides, 15~20
The reinforcing agent of part；The reinforcing agent is glass fibre, carbon fiber, any one in graphene.
Preferably, the raw material further includes 5~10 parts of lubricant.The lubricant be polytetrafluoroethylene (PTFE), molybdenum disulfide,
One of graphite.
Preferably, the preparation method of the raw material includes: by polyimides, reinforcing agent and lubricant respectively 150~220
It is dried at DEG C, is then uniformly mixed.Preferably, the time of the drying process is 2~4h.
In order to improve the uniformity coefficient of raw material and shorten incorporation time, it is preferred that it is described be uniformly mixed be by polyimides,
Reinforcing agent and lubricant are with 0.5~1.0min of mixing speed stirring of 2000~3000rpm.
Preferably, rodlike method is made in plate polyimide material includes: first to carry out plate polyimide material
Cutting obtains strip polyimide material, then strip polyimide material is machined out to obtain rodlike polyimide material.
Below in conjunction with specific embodiment, the following further describes the technical solution of the present invention.
In following embodiment, Examples 1 to 4 is the embodiment of the preparation method of bearing holder material, and embodiment 5 is axis
It accepts insurance and holds the embodiment of frame material, embodiment 6 is the embodiment of the preparation method of bearing retainer, and embodiment 7 is bearing holding
The embodiment of frame.
The mold used in the examples of the preparation method of bearing holder material in Examples 1 to 4 is plate framework
Mold.The plate framework mold, as shown in Figure 1, including top board 1, lower platen 2, framework 3, top board lower surface, lower platen
Upper surface and framework inner sidewall surround die cavity 4.The length of top board and lower platen and it is wide be respectively a mm and b mm, top board and
The thickness of lower platen is 30mm；It is assumed that the diameter of rodlike polyimide material is r, then height H >=8rmm of framework.Generally
Ground, height >=(r+2) mm of plate polyimide material obtained, long and wide respectively a mm and b mm, according to plate polyamides
The theoretical density ρ of imines materialIt is theoreticalWith volume ab (r+2), required weight is obtained by the product of theoretical density and volume
Amount, weighs the raw material according to quantity.
The raw material used in Examples 1 to 4 is made of polyimides, reinforcing agent and lubricant, for by polyimides, increasing
When strong agent and lubricant constitutive material preparation plate polyimide material, the theoretical density of plate polyimide material can be used
Following method is determined:
ρIt is theoretical=(m1+m2+m3)/(m1/ρ1+m2/ρ2+m3/ρ3)；
M in formula1、m2、m3The respectively quality of thermoplastic polyimide, reinforcing agent and lubricant, ρ1、ρ2、ρ3It is respectively hot
The density of plastic polyimide, reinforcing agent and lubricant.
The length and width of the pressing plate tooling used when pressurization are controlled respectively in (a-2) mm and (b-2) mm, and pressing plate tooling thickness is not
Less than (H-30 × 2-r-2) mm.
The programmable heat press of use can be realized temperature and pressure program setting, and dismountable with independent temperature
Circumferential heating mantles, for carrying out circumferential heating to plate framework mold.
Monoether anhydride type polyimides employed in embodiment is Ratem-YS20, has structure shown in formula I；It is adopted
Bis ether acid anhydride type polyimides is YHPI-P-100, has the structure as shown in Formula II.
Embodiment 1
The preparation method of the bearing holder material of the present embodiment, comprising the following steps:
1) thermoplastic polyimide, reinforcing agent and lubricant are dried respectively, mistake respectively after being cooled to room temperature
200 meshes, it is then independent sealed to save backup；The withering temperature of thermoplastic polyimide is 220 DEG C, and the time is
3h；Reinforcing agent and the withering temperature of lubricant are 150 DEG C, and the time is 3h；The thermoplastic polyimide of use
For Ratem-YS20, reinforcing agent is glass fibre, and lubricant is molybdenum disulfide.
2) ratio for being 70:20:10 according to the mass ratio of thermoplastic polyimide, reinforcing agent and lubricant, learns from else's experience respectively
Thermoplastic polyimide, reinforcing agent and the lubricant of drying process, which are put into high-speed tissue mashing machine to stir, obtains polyamides Asia for 3 times
Amine mixture (i.e. raw material)；The time stirred every time is 10s, and the revolving speed control of machine mixer is 3000rpm when stirring every time；
Obtained polyimides mixture is observed using 20 power microscopes, the polyimides mixture illustrated is qualification
Product and seal saved backup.
3) obtained polyimides mixture is filled in the die cavity of plate framework mold and molding, on top board plus
Then plate framework mold equipped with polyimides mixture is placed on programmable heat press, passes through pressure by one pressing plate tooling
It is 350kg/cm that plate tooling, which controls pressure,2, 3min is suppressed so that the air in die cavity is discharged, and heat then is implemented to plate framework mold
Press (pressure 350kg/cm2) plate framework mold is made to be warming up to 385 DEG C (heating rate is about 6.1 DEG C/min) through 60min, so
After keep the temperature 60min；Circumferential heating mantles are used to carry out circumferential heating to plate framework mold while coming into effect hot pressing, it is circumferential to add
Heat cover is warming up to 350 DEG C through 40min, then keeps circumferential heating mantles constant temperature；Programmable heat press automatic pressure-maintaining during heat preservation；
Plate framework mold removes circumferential heating mantles after keeping the temperature, using the method for fan blowing to plate framework mold
Cool down, when temperature is reduced to 350 DEG C, pressure is increased into 500kg/cm in 5min2And pressure maintaining 20min, Zhi Houguan
Pressure holding function is closed, during which continues blowing cooling, is demoulded when plate framework mold temperature is lower than 220 DEG C, it is sub- to obtain plate polyamides
Amine composite material.
4) plate composite polyimide material obtained is cut into the strip polyamides Asia that width is 11mm on cutting machine
Amine composite material, according still further to need strip composite polyimide material turnery processing be 10mm at diameter, length is 300mm's
Rodlike composite polyimide material to get.
Embodiment 2
The preparation method of the bearing holder material of the present embodiment, comprising the following steps:
1) thermoplastic polyimide, reinforcing agent and lubricant are dried respectively, mistake respectively after being cooled to room temperature
200 meshes, it is then independent sealed to save backup；The withering temperature of thermoplastic polyimide is 220 DEG C, and the time is
3h；Reinforcing agent and the withering temperature of lubricant are 150 DEG C, and the time is 3h；The thermoplastic polyimide of use
For YHPI-P-100, reinforcing agent is glass fibre, and lubricant is molybdenum disulfide.
2) ratio for being 85:18:5 according to the mass ratio of thermoplastic polyimide, reinforcing agent and lubricant, learns from else's experience dry respectively
Thermoplastic polyimide, reinforcing agent and the lubricant of dry processing, which are put into stir 3 times in high-speed tissue mashing machine, obtains polyimides
Mixture (i.e. raw material)；The time stirred every time is 10s, and the revolving speed control of machine mixer is 3000rpm when stirring every time；It will
Obtained polyimides mixture is observed using 20 power microscopes, and the polyimides mixture illustrated is qualified produces
Product and seal saved backup.
3) obtained polyimides mixture is filled in the die cavity of plate framework mold and molding, on top board plus
Then plate framework mold equipped with polyimides mixture is placed on programmable heat press, passes through pressure by one pressing plate tooling
It is 300kg/cm that plate tooling, which controls pressure,2, 3min is suppressed so that the air in die cavity is discharged, and heat then is implemented to plate framework mold
Pressure makes plate framework mold be warming up to 375 DEG C (heating rate is about 6.5 DEG C/min) through 55min, then keeps the temperature 65min；Start
Circumferential heating is carried out to plate framework mold using circumferential heating mantles while implementing hot pressing, circumferential heating mantles heat up through 35min
To 340 DEG C, circumferential heating mantles constant temperature is then kept；Programmable heat press automatic pressure-maintaining during heat preservation；
Plate framework mold removes circumferential heating mantles after keeping the temperature, using the method for fan blowing to plate framework mold
Cool down, when temperature is reduced to 345 DEG C, pressure is increased into 400kg/cm in 5min2And pressure maintaining 25min, Zhi Houguan
Pressure holding function is closed, during which continues blowing cooling, is demoulded when plate framework mold temperature is lower than 220 DEG C, it is sub- to obtain plate polyamides
Amine composite material.
4) plate composite polyimide material obtained is cut into the strip polyamides Asia that width is 11mm on cutting machine
Amine composite material, according still further to need strip composite polyimide material turnery processing be 10mm at diameter, length is 300mm's
Rodlike composite polyimide material to get.
Embodiment 3
The preparation method of the bearing holder material of the present embodiment, comprising the following steps:
1) thermoplastic polyimide, reinforcing agent and lubricant are dried respectively, mistake respectively after being cooled to room temperature
200 meshes, it is then independent sealed to save backup；The withering temperature of thermoplastic polyimide is 220 DEG C, and the time is
3h；Reinforcing agent and the withering temperature of lubricant are 150 DEG C, and the time is 3h；The thermoplastic polyimide of use
For Ratem-YS20, reinforcing agent is glass fibre, and lubricant is molybdenum disulfide.
2) ratio for being 77:15:8 according to the mass ratio of thermoplastic polyimide, reinforcing agent and lubricant, learns from else's experience dry respectively
Thermoplastic polyimide, reinforcing agent and the lubricant of dry processing, which are put into stir 3 times in high-speed tissue mashing machine, obtains polyimides
Mixture (i.e. raw material)；The time stirred every time is 20s, and the revolving speed control of machine mixer is 2000rpm when stirring every time；It will
Obtained polyimides mixture is observed using 20 power microscopes, and the polyimides mixture illustrated is qualified produces
Product and seal saved backup.
3) obtained polyimides mixture is filled in the die cavity of plate framework mold and molding, on top board plus
Then plate framework mold equipped with polyimides mixture is placed on programmable heat press, passes through pressure by one pressing plate tooling
It is 400kg/cm that plate tooling, which controls pressure,2, 3min is suppressed so that the air in die cavity is discharged, and heat then is implemented to plate framework mold
Pressure makes plate framework mold be warming up to 395 DEG C (heating rate is about 5.8 DEG C/min) through 65min, then keeps the temperature 55min；Start
Circumferential heating is carried out to plate framework mold using circumferential heating mantles while implementing hot pressing, circumferential heating mantles heat up through 45min
To 360 DEG C, circumferential heating mantles constant temperature is then kept；Programmable heat press automatic pressure-maintaining during heat preservation；
Plate framework mold removes circumferential heating mantles after keeping the temperature, using the method for fan blowing to plate framework mold
Cool down, when temperature is reduced to 355 DEG C, pressure is increased into 600kg/cm in 5min2And pressure maintaining 15min, Zhi Houguan
Pressure holding function is closed, during which continues blowing cooling, is demoulded when plate framework mold temperature is lower than 220 DEG C, it is sub- to obtain plate polyamides
Amine composite material.
4) plate composite polyimide material obtained is cut into the strip polyamides Asia that width is 11mm on cutting machine
Amine composite material, according still further to need strip composite polyimide material turnery processing be 10mm at diameter, length is 300mm's
Rodlike composite polyimide material to get.
Embodiment 4
The preparation method of the bearing holder material of the present embodiment, comprising the following steps:
1) thermoplastic polyimide is dried, temperature is 220 DEG C, time 3h, after being cooled to room temperature respectively
200 meshes are crossed, it is then independent sealed to save backup；The thermoplastic polyimide used can also use for Ratem-YS20
YHPI-P-100。
2) polyimides is filled in the die cavity of plate framework mold and molding, on top board plus a pressing plate tooling,
Then the plate framework mold equipped with polyimides is placed on programmable heat press, controlling pressure by pressing plate tooling is
400kg/cm2, 3min is suppressed so that the air in die cavity is discharged, and then implementing hot pressing to plate framework mold makes plate framework mold
395 DEG C (heating rate is about 5.8 DEG C/min) are warming up to through 65min, then keep the temperature 55min；It is adopted while coming into effect hot pressing
Circumferential heating is carried out to plate framework mold with circumferential heating mantles, circumferential heating mantles are warming up to 360 DEG C through 45min, then keep
Circumferential heating mantles constant temperature；Programmable heat press automatic pressure-maintaining during heat preservation；
Plate framework mold removes circumferential heating mantles after keeping the temperature, using the method for fan blowing to plate framework mold
Cool down, when temperature is reduced to 355 DEG C, pressure is increased into 600kg/cm in 5min2And pressure maintaining 15min, Zhi Houguan
Pressure holding function is closed, during which continues blowing cooling, is demoulded when plate framework mold temperature is lower than 220 DEG C, it is sub- to obtain plate polyamides
Amine material.
3) plate polyimide material obtained is cut into the strip polyimides material that width is 11mm on cutting machine
Material, according still further to need strip polyimide material turnery processing be 10mm at diameter, the rodlike polyimides that length is 300mm
Material to get.
Embodiment 5
The preparation method using above-described embodiment of the bearing holder material of the present embodiment is made, and repeats no more.
Embodiment 6
The preparation method of the bearing retainer of the present embodiment, comprising the following steps:
1) rodlike composite polyimide material is made according to preparation method in implementation 1 or embodiment 2 or embodiment 3；
2) according to retainer drawing, rodlike polyimide material obtained is subjected to machining, bearing retainer is made.
Embodiment 7
The bearing retainer of the present embodiment is made using the preparation method of the bearing retainer in embodiment 6, is repeated no more.
The mold of hot-forming use is shown in Fig. 2 in comparative example 1~4, housing 5, columnar mandrel 6, tubular including tubular
Pedestal 7 and tubular formed punch 8.The medial surface of housing 5, the side of mandrel 6, the upper surface of pedestal 7 and formed punch 8 lower end surface enclose
At die cavity.
Comparative example 1
The preparation method of the bearing retainer composite polyimide material of this comparative example, comprising the following steps:
Polyimides mixture obtained is packed into the die cavity of mold as shown in Figure 2 in Example 1, in die coat
Diameter is 11mm, and axle diameter 5mm, housing height is 130mm, and in order to guarantee material property consistency, formed punch pressing stroke is not easy
It is too long, mold is placed into it is hot-forming on hot press, soaking time 40 minutes, the other the same as in Example 1 to get；It is hot-forming
The pressure of use is much larger than corresponding embodiment 1, controls in 800~1000kg/cm2。
Comparative example 2
The preparation method of the bearing retainer composite polyimide material of this comparative example, comprising the following steps:
Polyimides mixture obtained is packed into the die cavity of mold as shown in Figure 2 in Example 2, in die coat
Diameter is 11mm, and axle diameter 5mm, housing height is 130mm, and in order to guarantee material property consistency, formed punch pressing stroke is not easy
It is too long, mold is placed into it is hot-forming on hot press, soaking time 40 minutes, the other the same as in Example 2 to get；It is hot-forming
The pressure of use is much larger than corresponding embodiment 2, controls in 800~1000kg/cm2。
Comparative example 3
The preparation method of the bearing retainer composite polyimide material of this comparative example, comprising the following steps:
Polyimides mixture obtained is packed into the die cavity of mold as shown in Figure 2 in Example 3, in die coat
Diameter is 11mm, and axle diameter 5mm, housing height is 130mm, and in order to guarantee material property consistency, formed punch pressing stroke is not easy
It is too long, mold is placed into it is hot-forming on hot press, soaking time 40 minutes, the other the same as in Example 3 to get；It is hot-forming
The pressure of use is much larger than corresponding embodiment 3, controls in 800~1000kg/cm2。
Comparative example 4
The preparation method of the bearing retainer polyimide material of this comparative example, comprising the following steps:
The polyimides saved backup in Example 4 is packed into the die cavity of mold as shown in Figure 2, die coat internal diameter
For 11mm, axle diameter 5mm, housing height is 130mm, and in order to guarantee material property consistency, formed punch pressing stroke was not easy
It is long, mold is placed into it is hot-forming on hot press, soaking time 40 minutes, the other the same as in Example 4 to get；It is hot-forming to adopt
Pressure is much larger than corresponding embodiment 4, controls in 800~1000kg/cm2。
Experimental example
The bearing that bearing holder material and comparative example 1~4 is made to the preparation method of Examples 1 to 4 respectively is kept
The performance of frame composite polyimide material is detected, and testing result is shown in Table 1.
The performance of 1 bearing holder material of table
It is can analyze out by upper table: the preparation method of bearing holder material of the invention, especially suitable for small size
The efficient preparation of column polyimide material, and plate polyimide material is pressurized uniformly, and embodiment density is more mutually coped with
Proportionate intensity is big, and the material of production is finer and close, and hardness, tensile strength are higher, and friction and wear behavior is excellent；It is especially of the invention
Preparation method made from each performance indicator consistency of material it is good, improving productivity 10 of the shaping efficiency compared with family of four mold
Times or more, such cost of manufacture for keeping frame material is significantly reduced, is conducive to expand its application range.
Bearing holder material in Examples 1 to 3 in the preparation, can also by lubricant replacement therein be graphite or
Polytetrafluoroethylene (PTFE) and/or reinforcing agent is replaced with into carbon fiber or graphene, polyimides obtained keeps frame material after replacement
Performance has certain otherness with formula, enhancing lubriation material, but generally, retainer is made using preparation method of the invention
The performance and consistency of material are superior to keep the performance of frame material, especially shaping efficiency using tubulose made of the prior art
Improve 10 times or more.
Claims (10)
1. a kind of preparation method of bearing holder material, it is characterised in that: the following steps are included:
1) raw material that main component is polyimides is provided；
2) plate polyimide material is made by the raw material is hot-forming, then plate polyimide material is made it is rodlike,
To obtain the final product.
2. the preparation method of bearing holder material according to claim 1, it is characterised in that: the hot-forming packet
It includes: by raw material in 300~400kg/cm2Pressure under through 55~65min be warming up to 375~395 DEG C, then heat-insulation pressure keeping 60~
120min, cool down after heat-insulation pressure keeping and pressure maintaining, continues to cool down and pressurize when temperature is down to 345~355 DEG C to make to press
Power increases 100~200kg/cm in 5min2, then proceed to cooling and 15~25min of pressure maintaining, release.
3. the preparation method of bearing holder material according to claim 1, it is characterised in that: the raw material mainly by with
The group of lower parts by weight is grouped as: 70~85 parts of polyimides, 15~20 parts of reinforcing agent；The reinforcing agent is glass fibers
Dimension, carbon fiber, any one in graphene.
4. the preparation method of bearing holder material according to claim 1, it is characterised in that: the raw material further includes 5
~10 parts of lubricant.
5. the preparation method of bearing holder material according to claim 1, it is characterised in that: by plate polyimides material
It includes: first to be cut to obtain strip polyimide material for plate polyimide material that rodlike method, which is made, in material, then by item
Shape polyimide material is machined out to obtain rodlike polyimide material.
6. bearing holder material made from a kind of preparation method using bearing holder material as described in claim 1.
7. a kind of preparation method of bearing retainer, it is characterised in that: the following steps are included:
1) raw material that main component is polyimides is provided；
2) plate polyimide material is made by the raw material is hot-forming, then plate polyimide material is made rodlike poly-
Acid imide material；
3) rodlike polyimide material obtained is subjected to machining and bearing retainer is made.
8. the preparation method of bearing retainer according to claim 7, it is characterised in that: it is described it is hot-forming include: by
Raw material is in 300~400kg/cm2Pressure under through 55~65min be warming up to 375~395 DEG C, then heat-insulation pressure keeping 60~
120min, cool down after heat-insulation pressure keeping and pressure maintaining, continues to cool down and pressurize when temperature is down to 345~355 DEG C to make to press
Power increases 100~200kg/cm in 5min2, then proceed to cooling and 15~25min of pressure maintaining, release.
9. the preparation method of bearing retainer according to claim 7, it is characterised in that: the raw material is mainly by following heavy
The group of amount number is grouped as: 70~85 parts of polyimides, 15~20 parts of reinforcing agent；The reinforcing agent is glass fibre, carbon
Any one in fiber, graphene.
10. a kind of using bearing retainer made from preparation method as claimed in claim 7.
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| CN113290759A (en) * | 2021-05-18 | 2021-08-24 | 洛阳轴承研究所有限公司 | Forming method of small-size polyimide self-lubricating composite retainer material |
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| CN109808114B (en) | 2021-03-09 |
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