CN109320884B - Ultrasonic motor friction plate and preparation method thereof - Google Patents
Ultrasonic motor friction plate and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08L27/18—Homopolymers or copolymers or tetrafluoroethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
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- C08K2003/085—Copper
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention belongs to the technical field of ultrasonic motors, and particularly relates to an ultrasonic motor friction plate and a preparation method thereof. The friction material adopted by the ultrasonic motor friction plate is prepared from the following raw materials: polytetrafluoroethylene, polyphenyl ester, carbon nano tube or glass fiber, alumina ceramic, copper powder and graphite. The friction plate has the advantages that through innovation of the raw material formula and the preparation process, the service life and the mechanical property of the friction plate are greatly improved, the wear resistance of the obtained friction plate is improved by nearly 4 times, and the temperature resistance, the friction coefficient and the hardness of the friction plate meet the requirements of industrial-grade products; meanwhile, the production cost is reduced, and the preparation efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of ultrasonic motors, and particularly relates to an ultrasonic motor friction plate and a preparation method thereof.
Background
The ultrasonic motor is a novel micro motor, and the vibration is converted into the rotary motion of a rotor through the friction action between a stator and the rotor. The friction plate between the stator and the rotor directly influences the mechanical performance and the service life of the ultrasonic motor.
At present, due to the limitation of the raw material formula and the production process of the friction plate, the performance of the existing friction plate can not meet the use requirements of an industrial-grade ultrasonic motor, for example, the hardness, the friction coefficient, the temperature resistance, the friction service life and the like can not meet the industrial requirements, and the maintenance cost of the ultrasonic motor is continuously increased.
Disclosure of Invention
The invention aims to provide an ultrasonic motor friction plate and a preparation method thereof aiming at the problem that the performance of the existing friction plate can not meet the use requirement of an industrial-grade ultrasonic motor, the friction plate greatly improves the service life and the mechanical performance of the friction plate by innovating a raw material formula and a preparation process, so that the wear resistance of the obtained friction plate is improved by nearly 4 times, and the temperature resistance, the friction coefficient and the hardness all meet the requirements of industrial-grade products; meanwhile, the production cost is reduced, and the preparation efficiency is improved.
The technical scheme of the invention is as follows: an ultrasonic motor friction plate is characterized in that the friction material adopted by the friction plate is prepared from the following raw materials in percentage by mass:
42-52% of polytetrafluoroethylene;
5-10% of polyphenyl ester;
5-10% of carbon nano tubes or glass fibers;
15-25% of alumina ceramic;
0-10% of copper powder;
0-10% of graphite.
The adopted friction material is prepared from the following raw materials in percentage by mass:
50% of polytetrafluoroethylene;
8% of polyphenyl ester;
8% of carbon nano tube;
20% of alumina ceramic;
6% of copper powder;
8% of graphite.
The particle size of the raw materials is as follows:
polytetrafluoroethylene is 20-50 mu m;
20-45 μm of polyphenyl ester;
5-20 nm of carbon nano tube;
10-30 μm glass fiber;
50-80 nm of alumina ceramic;
copper powder is 15-45 mu m;
the graphite is less than or equal to 30 mu m, wherein the purity of the graphite is 99.85 percent.
The particle size range of the polytetrafluoroethylene and the polyphenyl ester can be selected for hot press molding better; the particle size range of the carbon nano tube is selected, so that the intermiscibility between the carbon nano tube and the polytetrafluoroethylene and the polyphenyl ester is greatly improved, and the carbon nano tube is more uniform; the particle size of the alumina ceramic is selected because the combination with the carbon nanotubes in the particle size range has better effect.
The thickness of the friction material is 0.1-0.3 mm.
The thickness of the friction material is 0.2 mm.
A preparation method of the ultrasonic motor friction plate comprises the following steps:
(1) firstly, uniformly mixing the raw materials in proportion, then accurately weighing each 50g of the raw materials, and putting the raw materials into a grinding tank;
(2) adding 50ml of absolute ethyl alcohol into a grinding tank, and putting the grinding tank into a grinder for 2-4 hours;
(3) after grinding is finished, screening out grinding balls, putting the ground mixture into a vacuum drying oven, setting the temperature to be 85-110 ℃, and drying for 3-5 hours;
(4) crushing the dried mixture into powder, and putting the powder into a forming die;
(5) putting the forming die into a hydraulic press, setting the pressure to be 20-35 MPa, and keeping the pressure for 1 hour; then standing for 24-48 hours at 45-60 ℃ to obtain a formed blank;
(6) placing the formed blank obtained in the step (5) in a sintering furnace for sintering treatment, controlling the temperature rise speed at 20-60 ℃/h, heating to 300 ℃, preserving heat for 3-5 hours, then raising the temperature to 360-370 ℃, and preserving heat for 3-5 hours; after sintering, cooling treatment is carried out, and the cooling speed is controlled within 20 ℃/h; obtaining a friction material;
(7) rolling the friction material to 0.1-0.3 mm by adopting a rolling process at 105-115 ℃;
(8) and (4) stamping and forming the rolled friction material according to the use specification to obtain the friction plate.
The invention has the beneficial effects that:
1. the friction plate is innovated in the raw material formula, the polyphenyl ester and the polytetrafluoroethylene are blended to improve the hardness and the wear resistance of the friction material to a certain extent, and a proper amount of carbon nano tubes and alumina ceramics are added in the formula simultaneously, so that the hardness, the heat conductivity and the wear resistance of the friction plate are effectively and greatly improved, the whole raw material formula is taken as an organic whole and is matched and cooperated with each other, the service life and the mechanical property of the friction plate are greatly improved, the wear resistance of the obtained friction plate is improved by nearly 4 times, and the temperature resistance, the friction coefficient and the hardness of the friction plate meet the requirements of industrial products.
2. The preparation method of the ultrasonic motor friction plate designed by the invention has the advantages of compact process flow design, simple and reliable process and effectively improved preparation efficiency.
3. The friction plates with different diameters can be formed by nesting and punching by adopting a rolling process, so that the utilization rate of raw materials is improved, and the material cost is greatly reduced.
Detailed Description
The present invention will be described in detail below with reference to examples. The TPD-40G ultrasonic motor is taken as an example.
Example 1
The friction material adopted by the ultrasonic motor friction plate is prepared from the following raw materials in percentage by mass:
50% of polytetrafluoroethylene;
8% of polyphenyl ester;
8% of carbon nano tube;
20% of alumina ceramic;
6% of copper powder;
8% of graphite.
The grain size of the used raw materials is as follows: polytetrafluoroethylene is 20-50 mu m; 20-45 μm of polyphenyl ester; 5-20 nm of carbon nano tube; 10-30 μm glass fiber; 50-80 nm of alumina ceramic; copper powder is 15-45 mu m; the graphite is less than or equal to 30 mu m, wherein the purity of the graphite is 99.85 percent.
The preparation method of the ultrasonic motor friction plate comprises the following steps:
(1) firstly, uniformly mixing the raw materials in proportion, then accurately weighing each 50g of the raw materials, and putting the raw materials into a grinding tank;
(2) adding 50ml of absolute ethyl alcohol into a grinding tank, and putting the grinding tank into a grinder for 2-4 hours;
(3) after grinding is finished, screening out grinding balls, putting the ground mixture into a vacuum drying oven, setting the temperature to be 85-110 ℃, and drying for 3-5 hours;
(4) crushing the dried mixture into powder, and putting the powder into a forming die;
(5) putting the forming die into a hydraulic press, setting the pressure to be 20-35 MPa, and keeping the pressure for 1 hour; then standing for 24-48 hours at 45-60 ℃ to obtain a formed blank;
(6) placing the formed blank obtained in the step (5) in a sintering furnace for sintering treatment, controlling the temperature rise speed at 20-60 ℃/h, heating to 300 ℃, preserving heat for 3-5 hours, then raising the temperature to 360-370 ℃, and preserving heat for 3-5 hours; after sintering, cooling treatment is carried out, and the cooling speed is controlled within 20 ℃/h; obtaining a friction material;
(7) rolling the friction material to 0.1-0.3 mm by adopting a rolling process at 105-115 ℃;
(8) and (4) stamping and forming the rolled friction material according to the use specification to obtain the friction plate.
The service life of the friction plate obtained by adopting the raw material formula and the preparation process in the embodiment 1 is more than or equal to 4000 hours.
The relevant performance indexes of the friction plate obtained in the embodiment 1 and the formulas and performance indexes of other embodiments are detailed in a table 1. Wherein, a TH210 Shore D scale durometer is adopted to measure the hardness of the material; measuring the compression elastic modulus of the material by using an INSTRON-5569 type electronic universal material tester according to the requirements in GB/T14694-1993; testing the frictional wear performance of the material by using a ring block type M-200 frictional wear testing machine according to GB 3960-83; and testing the performance of the ultrasonic motor by using an ultrasonic motor comprehensive performance test bench.
TABLE 1
As can be seen from table 1, the raw materials in the raw material formula of the present invention are cooperatively matched with each other as an organic whole, and different combinations and ratios of the raw materials have different influences on the performance of the friction plate in different aspects, especially have a large influence on the lock-up torque and the idle rotation speed of the ultrasonic motor, so that the formula of the present invention is not simply replaced or superimposed, wherein example 1 is the most preferable scheme of the present invention, and the friction plate obtained by using the formula of example 1 is used for the ultrasonic motor, and the lock-up torque and the idle rotation speed of the ultrasonic motor are the maximum, especially the idle rotation speed is far higher than others, and the motor has a better load characteristic.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all applications that can be directly or indirectly applied to relevant or other technical fields using the contents of the present specification are included in the scope of the present invention.
Claims (5)
1. The ultrasonic motor friction plate is characterized in that the adopted friction material is prepared from the following raw materials in percentage by mass:
42-52% of polytetrafluoroethylene;
5-10% of polyphenyl ester;
5-10% of carbon nano tubes or glass fibers;
15-25% of alumina ceramic;
0-10% of copper powder;
0-10% of graphite;
the ultrasonic motor friction plate is prepared by the following steps:
(1) firstly, uniformly mixing the raw materials in proportion, then accurately weighing each 50g of the raw materials, and putting the raw materials into a grinding tank;
(2) adding 50ml of absolute ethyl alcohol into a grinding tank, and putting the grinding tank into a grinder for 2-4 hours;
(3) after grinding is finished, screening out grinding balls, putting the ground mixture into a vacuum drying oven, setting the temperature to be 85-110 ℃, and drying for 3-5 hours;
(4) crushing the dried mixture into powder, and putting the powder into a forming die;
(5) putting the forming die into a hydraulic press, setting the pressure to be 20-35 MPa, and keeping the pressure for 1 hour; then standing for 24-48 hours at 45-60 ℃ to obtain a formed blank;
(6) placing the formed blank obtained in the step (5) in a sintering furnace for sintering treatment, controlling the temperature rise speed at 20-60 ℃/h, heating to 300 ℃, preserving heat for 3-5 hours, then raising the temperature to 360-370 ℃, and preserving heat for 3-5 hours; after sintering, cooling treatment is carried out, and the cooling speed is controlled within 20 ℃/h; obtaining a friction material;
(7) rolling the friction material to 0.1-0.3 mm by adopting a rolling process at 105-115 ℃;
(8) and (4) stamping and forming the rolled friction material according to the use specification to obtain the friction plate.
2. The ultrasonic motor friction plate according to claim 1, wherein the friction material is made of the following raw materials by mass percent:
50% of polytetrafluoroethylene;
8% of polyphenyl ester;
8% of carbon nano tube;
20% of alumina ceramic;
6% of copper powder;
8% of graphite.
3. The ultrasonic motor friction plate according to claim 1 or 2, wherein the particle size of the raw material is:
polytetrafluoroethylene is 20-50 mu m;
20-45 μm of polyphenyl ester;
5-20 nm of carbon nano tube;
10-30 μm glass fiber;
50-80 nm of alumina ceramic;
copper powder is 15-45 mu m;
the graphite is less than or equal to 30 mu m, wherein the purity of the graphite is 99.85 percent.
4. The ultrasonic motor friction plate according to claim 1 or 2, wherein the friction material has a thickness of 0.1 to 0.3 mm.
5. The ultrasonic motor friction plate of claim 4, wherein the friction material has a thickness of 0.2 mm.
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| CN109796709A (en) * | 2019-02-25 | 2019-05-24 | 南京航空航天大学 | A kind of ultrasound electric machine carbonitride modified polytetrafluoroethylcomposite composite material and preparation method |
| CN109912910B (en) * | 2019-03-19 | 2020-02-14 | 中国科学院兰州化学物理研究所 | High-thermal-conductivity insulating polytetrafluoroethylene friction material and preparation method and application thereof |
| CN109825014B (en) * | 2019-03-19 | 2020-03-17 | 中国科学院兰州化学物理研究所 | High-elasticity-modulus polytetrafluoroethylene friction material and preparation method and application thereof |
| CN110373073A (en) * | 2019-07-31 | 2019-10-25 | 江苏紫金东方超声电机有限公司 | A kind of preparation process of ultrasound electric machine composite friction material |
| CN111215301A (en) * | 2020-02-14 | 2020-06-02 | 山东富驰精密机械科技有限公司 | Method for spraying friction material of rotor of piezoelectric actuator and spraying tool |
| CN112266560A (en) * | 2020-10-13 | 2021-01-26 | 南京馨怡美生物科技有限公司 | Nano polytetrafluoroethylene composite material and preparation method thereof |
| CN113733424B (en) * | 2021-09-07 | 2022-04-12 | 江苏紫金东方超声电机有限公司 | Sheet layer forming device for ultrasonic motor friction material and production process thereof |
| CN116515218A (en) * | 2023-05-08 | 2023-08-01 | 广东鑫辉科技股份有限公司 | Wear-resistant heat-conducting fluororubber and preparation method thereof |
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| GB1453289A (en) * | 1973-11-01 | 1976-10-20 | Ivanov P M | Antifriction composition |
| CN101096423A (en) * | 2007-06-22 | 2008-01-02 | 哈尔滨工业大学 | Temperature-resistant resin modified polyphenyl ester ternary alloy ultrasonic motor friction material |
| CN102634147B (en) * | 2012-04-11 | 2014-04-23 | 南京航空航天大学 | Polyvinylidene fluoride based composite frictional material for traveling wave type revolving ultrasonic motor and preparation method thereof |
| CN105968662B (en) * | 2016-07-15 | 2018-09-25 | 宁波大学 | Ultrasound electric machine carbon micron tube filled polymer oil-containing friction material and preparation method thereof |
| CN108359198B (en) * | 2018-01-23 | 2020-07-07 | 曹华刚 | Friction material for piezoelectric motor and preparation method and application thereof |
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