CN115853906A - Forming method of modified PEEK three-layer composite shaft sleeve with oil holes - Google Patents
Forming method of modified PEEK three-layer composite shaft sleeve with oil holes Download PDFInfo
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Abstract
The application discloses a forming method of a modified PEEK three-layer composite shaft sleeve with oil holes, which comprises the following steps: sintering a porous copper powder layer on a metal substrate, and brushing or spraying a wetting agent on the surface of the porous copper powder layer to wet the surface of the spherical powder layer; spreading dry modified PEEK granules on the wet surface of the ball powder plate, and then drying; quickly taking out the plasticized mixture and immediately putting the plasticized mixture into a heating rolling mill with an oil cavity roller to roll an oil cavity; and after cooling, putting the mixture into a smooth roll mill for rolling, blanking, rolling, internally shaping and annealing to obtain a finished shaft sleeve product. The forming method has the characteristics of simple process, good oil hole forming quality and the like, and the prepared shaft sleeve has excellent antifriction performance and wear resistance.
Description
Technical Field
The application belongs to the field of self-lubricating bearings, and particularly relates to a forming method of a modified PEEK three-layer composite bearing with oil holes.
Background
Polyetheretherketone (PEEK) is a special engineering plastic with high temperature resistance, acid and alkali resistance and high strength, and is commonly used in the fields of electronics, medical treatment, automobiles, mechanical manufacturing and the like. When the PEEK material is used in the field of mechanical equipment such as bearings, the pure PEEK material has a large friction coefficient and cannot be directly used, and the material needs to be modified to reduce the friction coefficient. Although the friction coefficient of the modified PEEK material is reduced, on one hand, the modified PEEK material is hard and brittle, the plastic deformation capacity is reduced sharply, and the elongation at break is reduced from 40% to about 4%, so that the material cannot be directly rolled into oil pits by an oil pit rolling mill; on the other hand, the thermal deformation temperature of the modified PEEK material is increased from 150 ℃ to over 300 ℃, so that the difficulty of oil pocket manufacturing is further increased.
Chinese patent CN101032752A discloses a method for forming self-lubricating composite layer polymer material for mechanical products, wherein an oil hole rolling mode is given as follows: firstly pressing out a flat plate, then putting the flat plate into an oven to be preheated to 445-555 ℃, and then immediately taking out the flat plate and putting the flat plate into a fillet rolling roller to roll an oil hole. This approach has the following problems: firstly, two times of heating are needed, and the forming mode is complex; secondly, the temperature of twice heating is too high, and the PEEK material can be damaged to a certain extent due to excessive plasticization after being heated again, particularly the surface oxidation is serious, so that the material performance, particularly the antifriction performance, is reduced; thirdly, the temperature of the heated PEEK material is rapidly reduced in the air, so that the problems of uneven rolling thickness, scale-shaped wrinkles on the surface and the like are easily caused. In addition, when heated PEEK meets a roller at room temperature, the roller can be rapidly reduced and hardened, so that the problems of unevenness of rolled oil pits, cracking of materials at the oil pits and the like are caused.
Patent CN110815994A discloses a three-layer composite self-lubricating material and a continuous production process thereof, wherein another production process of PEEK sheet is provided, the composite material which is granulated for many times is required to be made into a soft belt which is heated and a sintered ball powder plate, and the soft belt and the sintered ball powder plate are rolled for many times by a hot rolling mill to prepare the composite sheet, a soft belt forming device, a soft belt heating device, a synchronous device of the soft belt and the sintered ball powder plate and the like are required in the process, the forming device required by the method has more occupied area and is large, the forming process is complex, and the production efficiency is low and the production cost is high.
Chinese patent 200910153447.1 discloses a production process of a PEEK-coated high-performance sliding bearing, wherein a manufacturing method of a plate with an oil cavity is also provided, the method needs to prepare a PEEK film, a preheated ball powder plate, a covering film, hot pressing, flat rolling, oil cavity rolling, material cutting, forming and other steps, the hot pressing mode is firstly low in material preparation efficiency, the time from temperature rise to temperature drop needs about 3 hours, and in addition, PEEK is a brittle material and cannot be directly cold-rolled, so the manufactured plate needs to be heated firstly to roll the oil cavity in the oil cavity rolling process, the forming method needs to be heated twice to prepare the plate with the oil cavity, and in addition, extrusion equipment is also needed to prepare the PEEK film, and the method also has the problems of complex process, low production efficiency and high manufacturing cost.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the method for forming the modified PEEK three-layer composite shaft sleeve with the oil holes, which has the advantages of simple manufacturing process, excellent prepared performance, uniform and controllable thickness and good oil hole forming quality.
The technical scheme of the application is as follows:
a forming method of a modified PEEK three-layer composite shaft sleeve with oil holes comprises the following steps:
(1) Sintering a porous copper powder layer on a metal substrate to manufacture a spherical powder plate;
(2) The surface of the ball powder board is brushed or sprayed with a wetting agent to wet the surface of the ball powder board. Preferably, the wetting agent is one of a PEEK dispersion or a PAI dispersion. Because the surface layer material can not slide greatly when the oil pits are rolled, the place with more material can not be supplemented to the place with less material by rolling, and the uniformity of spreading the modified PEEK granules on the surface of the ball powder plate needs to be ensured. However, the particles are easy to roll due to large impact force when being spread, and particularly, the phenomenon of material shortage is easy to occur at the edge of the ball powder plate. In order to ensure that the granules do not roll when spreading, the surface of the powder ball board needs to be wetted so as to have certain adhesive property. In addition, after the moisture in the wetting agent is evaporated, the residual substance can still retain a certain viscosity to ensure that a certain adhesive force is formed between the granules and the ball powder plate, the granules are prevented from rolling in the moving process of the ball powder plate, in addition, the residual substance is melted but is not decomposed after the plasticizing process, the good combination can be generated between the ball powder and the PEEK material, the adhesive strength between the ball powder and the PEEK material is enhanced, and the PEEK dispersion liquid or the PAI dispersion liquid is more suitable.
(3) Spreading dry modified PEEK granules on the wet surface of the ball powder plate, and then drying; preferably, the dried modified PEEK granules are dried in an oven at 100-200 ℃ for 3-5h; and the secondary drying is to place the ball powder plate paved with the modified PEEK granules into a mesh belt furnace at the temperature of 105-200 ℃ to dry for 20-40 min.
(4) Plasticizing in a mesh belt furnace with protective gas; preferably, the plasticizing temperature in the mesh belt furnace is 350-415 ℃, and the plasticizing time is 5-20min; the protective gas is nitrogen or an inert gas.
(5) Rapidly taking out the plasticized PEEK three-layer composite plate from the outlet end of the mesh belt furnace, immediately putting the plate into a heating rolling mill with an oil cavity roller, and rolling an oil cavity on the surface of the plate; preferably, the temperature of the heating rolling mill is 100-250 ℃; the depth of the oil pocket is 0.2mm-0.4mm. In the plasticizing process, PEEK granules are melted, granules with small intervals are fused together, but the interval of the granules is large, a small-area material shortage is easily formed in the area under the influence of the surface tension of the material, so that the surface of the plasticized material has small-area material shortage points, the PEEK material is rolled during rolling to close the material shortage points, but air at the material shortage points is difficult to completely discharge, micropores are left at the material shortage points, lubricating grease is usually smeared on the surface of the material during use, the PEEK material is oleophilic, the lubricating grease smeared under the action of capillary tubes enters the micropores, the lubricating grease in the micropores is extruded through thermal expansion in the friction and wear process, and the lubricating performance of the material is enhanced.
(6) After cooling, putting the plate into a smooth roll mill to roll the plate with the required thickness, wherein the rolling amount is 0.02mm-0.10mm; preferably, cooling is air cooling or water cooling.
(7) Blanking, rolling and internally shaping to prepare the modified PEEK three-layer composite shaft sleeve with the oil holes;
(8) And annealing the modified PEEK three-layer composite shaft sleeve with the oil holes at 220-280 ℃ for 1-5 h to obtain a finished shaft sleeve product.
The invention has the beneficial effects that:
the ball powder plate evenly spread with the modified PEEK granules can be directly rolled out of an oil pocket by using a heating rolling mill with an oil pocket roller after being dried and plasticized, so that a plate with the oil pocket with good formability is obtained, and the phenomenon that the rolling performance of the surface of a PEEK layer is deteriorated due to rapid reduction of the temperature can not occur. But the temperature of the roller with the oil cavity is not too low, so that the PEEK is cooled too fast, and the problems of uneven thickness of the rolled plate and the like easily occur; in addition, the temperature is not easy to be too high, and the plasticized and softened PEEK is still in a softened state and is adhered to a roller during rolling or the plastic layer is easy to be brought up locally on the plate material due to the local softened state, particularly at the inlet end. Therefore, the temperature of the hot rolling mill in the application is selected to be 100-250 ℃, so that the processed product meets the requirements.
When the hot-rolled plate with the oil holes is rolled out, the PEEK layer can slightly deform under the influence of the oil hole nails, so that a small amount of rolling needs to be carried out by a smooth roll mill, the surface quality is ensured, the bonding strength of the PEEK layer and the ball powder plate is not influenced, and the service life of the plate is not reduced.
The PEEK three-layer composite board with the oil holes is required to be prepared into the shaft sleeve through the working procedures of blanking, rolling, shaping and the like, so that the crystallinity of the PEEK layer is not too high, otherwise, the PEEK layer is too brittle and too hard to be easily damaged during processing, and an air cooling or water cooling mode is required to be used, so that the plastic layer keeps low crystallinity.
The internal stress of the material after rolling, rolling and internal shaping is large, the opening seam can be very small only by a very high shaping amount, but the plastic layer is seriously damaged due to the overlarge shaping amount, so that the frictional wear and the service life of the material are influenced. In addition, the water-cooled or air-cooled PEEK plate has low crystallinity and poor wear resistance, so that the annealing treatment is adopted to remove the internal stress of the material, reduce the opening seam, reduce the reshaping quantity and greatly reduce the performance reduction caused by reshaping; in addition, the crystallinity of the PEEK layer is improved after annealing, and the wear resistance is improved.
In the method, only paving equipment, a mesh belt drying furnace, a mesh belt plasticizing furnace, a heating rolling mill and a smooth rolling mill are needed from the step of paving the granules to the step of preparing the plate, the manufacturing time is only about 1 hour, the used production equipment is few, and the production efficiency is high.
In a word, compared with the prior art, the forming method has the advantages of less production equipment, simple manufacturing process, high production efficiency, good oil hole forming quality and excellent antifriction performance and wear resistance of the prepared shaft sleeve.
Detailed Description
The present invention is described in further detail below with reference to examples.
The modified PEEK pellets in the following examples and comparative examples were PEEK pellets of RD01-D type produced by Polymer materials Ltd of Mitsui, jilin province.
The first embodiment is as follows:
a forming method of a modified PEEK three-layer composite shaft sleeve with oil holes comprises the following steps:
(1) Sintering a porous copper powder layer on low-carbon steel with a copper plating SPCC (spray copper control) mark and a thickness of 2.5mm to prepare a spherical powder plate, wherein the thickness of the spherical powder plate is 2.8mm;
(2) Spraying PEEK dispersion liquid on the ball powder plate to moisten the surface of the ball powder plate;
(3) Uniformly spreading the dried modified PEEK granules on a spherical powder plate by using a spreading machine; putting the ball powder plate with the spread granules into a mesh belt furnace at the temperature of 150 ℃ to dry for 30min;
(4) Placing the dried powder plate of the aggregate spreading ball into a nitrogen protection mesh belt furnace at 350 ℃ for plasticizing for 20min;
(5) Rapidly taking out the plasticized PEEK plate from the outlet end of the mesh belt furnace, putting the plasticized PEEK plate into a heating rolling mill with a temperature of 250 ℃ and an oil cavity roller, and rolling to obtain a modified PEEK three-layer composite plate with an oil cavity, wherein the thickness of the three-layer composite plate is 3.02mm, and the depth of the oil cavity is 0.20mm;
(6) Air cooling the prepared modified PEEK three-layer composite board with the oil holes; and (3) putting the cooled modified PEEK three-layer composite board with the oil holes into a smooth roll mill to roll the board with the required thickness, wherein the rolling amount is 0.02mm.
(7) Blanking according to the specification of the bearing; rolling and internally shaping to prepare the modified PEEK three-layer composite shaft sleeve with the oil holes;
(8) And annealing, namely annealing the modified PEEK three-layer composite shaft sleeve with the oil holes at 220 ℃ for 5 hours to obtain a finished shaft sleeve product.
Example two:
a forming method of a modified PEEK three-layer composite shaft sleeve with oil holes comprises the following steps:
(1) Sintering a porous copper powder layer on copper-plated ST 12-grade low-carbon steel gold with the thickness of 2.5mm to prepare a spherical powder plate, wherein the thickness of the spherical powder plate is 2.8mm;
(2) Spraying PEEK dispersion liquid on the ball powder plate to wet the surface of the ball powder plate;
(3) Uniformly spreading the dried modified PEEK granules on a spherical powder plate by using a spreading machine; putting the ball powder plate paved with the granules into a mesh belt furnace at the temperature of 105 ℃ to dry for 40min;
(4) Placing the dried powder plate of the aggregate spreading ball into a nitrogen protection mesh belt furnace at the temperature of 400 ℃ for plasticizing for 15min;
(5) Rapidly taking out the plasticized PEEK plate from the outlet end of the mesh belt furnace, putting the plasticized PEEK plate into a heating rolling mill with an oil cavity roller, rolling the plasticized PEEK plate into a heating rolling mill with the oil cavity roller at the temperature of 100 ℃, and rolling out the modified PEEK three-layer composite plate with the oil cavity, wherein the thickness of the three-layer composite plate is 3.10mm, and the depth of the oil cavity is 0.3mm;
(6) Carrying out water cooling on the prepared modified PEEK three-layer composite board with the oil holes; and (3) putting the cooled PEEK three-layer composite board with the oil cavity modification into a smooth roll mill to roll a board with the required thickness, wherein the rolling quantity is 0.10mm.
(7) Blanking according to the specification of the bearing; rolling and shaping the materials to obtain a modified PEEK three-layer composite shaft sleeve with oil holes;
(8) Annealing, namely annealing the modified PEEK three-layer composite shaft sleeve with the oil holes at 250 ℃ for 3 hours to obtain a finished shaft sleeve product.
Example three:
a forming method of a modified PEEK three-layer composite shaft sleeve with oil holes comprises the following steps:
(1) Sintering a porous copper powder layer on a copper-plated DC 01-grade low-carbon steel metal substrate with the thickness of 2.5mm to prepare a spherical powder plate, wherein the thickness of the spherical powder plate is 2.8mm;
(2) Spraying PEEK dispersion liquid on the ball powder plate to wet the surface of the ball powder plate;
(3) Uniformly spreading the dried modified PEEK granules on a spherical powder plate by using a spreading machine; putting the ball powder plate with the spread granules into a mesh belt furnace at the temperature of 200 ℃ to dry for 20min;
(4) Putting the dried powder plate of the aggregate spreading ball into a nitrogen protection mesh belt furnace at the temperature of 415 ℃ for plasticizing for 5min;
(5) Rapidly taking out the plasticized PEEK plate from the outlet end of the mesh belt furnace, putting the plasticized PEEK plate into a heating rolling mill with an oil cavity roller, rolling the heated rolling mill at the temperature of 150 ℃ to obtain a modified PEEK three-layer composite plate with an oil cavity, wherein the thickness of the three-layer composite plate is 3.02mm, and the depth of the oil cavity is 0.20mm; (ii) a
(6) Air cooling the prepared modified PEEK three-layer composite board with the oil holes; and (3) putting the cooled modified PEEK three-layer composite board with the oil holes into a smooth roll mill to roll the board with the required thickness, wherein the rolling amount is 0.02mm.
(7) Blanking according to the specification of the bearing; rolling and internally shaping the mixture to prepare a modified PEEK three-layer composite shaft sleeve with oil holes;
(8) Annealing, namely annealing the modified PEEK three-layer composite shaft sleeve with the oil holes for 1 hour at 280 ℃ to obtain a finished shaft sleeve product.
Example four:
a forming method of a modified PEEK three-layer composite shaft sleeve with oil holes comprises the following steps:
(1) Sintering a porous copper powder layer on low-carbon steel with a copper plating SPCC (spray copper plating control) mark and a thickness of 2.5mm to prepare a spherical powder plate, wherein the thickness of the spherical powder plate is 2.8mm;
(2) Spraying PEEK dispersion liquid on the ball powder plate to wet the surface of the ball powder plate;
(3) Uniformly spreading the dried modified PEEK granules on a spherical powder plate by using a spreading machine; putting the ball powder plate with the spread granules into a mesh belt furnace at the temperature of 150 ℃ to dry for 30min;
(4) Placing the dried powder plate of the aggregate spreading ball into a nitrogen protection mesh belt furnace at 350 ℃ for plasticizing for 20min;
(5) Rapidly taking out the plasticized PEEK plate from the outlet end of the mesh belt furnace, putting the plasticized PEEK plate into a heating rolling mill with a temperature of 250 ℃ and an oil cavity roller, and rolling to obtain a modified PEEK three-layer composite plate with an oil cavity, wherein the thickness of the three-layer composite plate is 3.22mm, and the depth of the oil cavity is 0.40mm;
(6) Air cooling the prepared PEEK three-layer composite board with the oil cavity modification; and (3) putting the cooled modified PEEK three-layer composite board with the oil holes into a smooth roll mill to roll the board with the required thickness, wherein the rolling amount is 0.02mm.
(7) Blanking according to the specification of the bearing; rolling and internally shaping to prepare the modified PEEK three-layer composite shaft sleeve with the oil holes;
(10) And annealing, namely annealing the modified PEEK three-layer composite shaft sleeve with the oil holes at 220 ℃ for 5 hours to obtain a finished shaft sleeve product.
Example five:
a forming method of a modified PEEK three-layer composite shaft sleeve with oil holes comprises the following steps:
(1) Sintering a porous copper powder layer on low-carbon steel with a copper plating SPCC (spray copper plating control) mark and a thickness of 2.5mm to prepare a spherical powder plate, wherein the thickness of the spherical powder plate is 2.8mm;
(2) Spraying PEEK dispersion liquid on the ball powder plate to wet the surface of the ball powder plate;
(3) Uniformly spreading the dried modified PEEK granules on a spherical powder plate by using a spreading machine; putting the ball powder plate with the spread granules into a mesh belt furnace at the temperature of 150 ℃ to dry for 30min;
(4) Putting the dried powder plate of the aggregate spreading ball into a nitrogen protection mesh belt furnace at the temperature of 350 ℃ for plasticizing for 20min;
(5) Rapidly taking out the plasticized PEEK plate from the outlet end of the mesh belt furnace, and putting the plasticized PEEK plate into a heating rolling mill with the temperature of an oil cavity roller at 250 ℃ to roll out a modified PEEK three-layer composite plate with an oil cavity, wherein the thickness of the three-layer composite plate is 3.32mm, and the depth of the oil cavity is 0.50mm;
(6) Air cooling the prepared PEEK three-layer composite board with the oil cavity modification; and (3) putting the cooled modified PEEK three-layer composite board with the oil holes into a smooth roll mill to roll the board with the required thickness, wherein the rolling amount is 0.02mm.
(7) Blanking, namely blanking according to the specification of the bearing; rolling and internally shaping to prepare the modified PEEK three-layer composite shaft sleeve with the oil holes;
(8) And annealing, namely annealing the modified PEEK three-layer composite shaft sleeve with the oil holes at 220 ℃ for 5 hours to obtain a finished shaft sleeve product.
Comparative example one:
a forming method of a modified PEEK three-layer composite shaft sleeve with oil holes comprises the following steps:
(1) Sintering a porous copper powder layer on low-carbon steel with a copper plating SPCC (spray copper plating control) mark and a thickness of 2.5mm to prepare a spherical powder plate, wherein the thickness of the spherical powder plate is 2.8mm; (ii) a
(2) Spraying PEEK dispersion liquid on the ball powder plate to wet the surface of the ball powder plate;
(3) Uniformly spreading the dried modified PEEK granules on a spherical powder plate by using a spreading machine; putting the ball powder plate with the spread granules into a mesh belt furnace at the temperature of 150 ℃ to dry for 30min;
(4) Putting the dried powder plate of the aggregate spreading ball into a nitrogen protection mesh belt furnace at the temperature of 350 ℃ for plasticizing for 20min;
(5) Quickly taking out the plasticized PEEK plate from the outlet end of the mesh belt furnace, putting the plasticized PEEK plate into a smooth roller, and rolling the smooth roller into a heating rolling mill at 250 ℃ to prepare the light plate modified PEEK three-layer composite plate;
(6) Putting the light plate modified PEEK three-layer composite board into a nitrogen protection mesh belt furnace at the temperature of 350 ℃ for plasticizing for 20min;
(7) Quickly taking out the light plate modified PEEK three-layer composite plate which is plasticized again from the outlet end of the mesh belt furnace, putting the light plate modified PEEK three-layer composite plate into a heating rolling mill with an oil cavity roller, rolling the heating rolling mill at the temperature of 250 ℃ to obtain the modified PEEK three-layer composite plate with the oil cavity, wherein the thickness of the three-layer composite plate is 3.02mm, and the depth of the oil cavity is 0.20mm; (ii) a
(8) Air cooling the prepared PEEK three-layer composite board with the oil cavity modification; and (3) putting the cooled modified PEEK three-layer composite board with the oil holes into a smooth roll mill to roll the board with the required thickness, wherein the rolling amount is 0.02mm.
(9) Blanking according to the specification of the bearing; rolling and internally shaping to prepare the modified PEEK three-layer composite shaft sleeve with the oil holes;
(10) And annealing, namely annealing the modified PEEK three-layer composite shaft sleeve with the oil holes at 220 ℃ for 5 hours to obtain a finished shaft sleeve product.
Comparative example two:
a forming method of a modified PEEK three-layer composite shaft sleeve with oil holes comprises the following steps:
(1) Sintering a porous copper powder layer on low-carbon steel with a copper plating SPCC (spray copper control) mark and a thickness of 2.5mm to prepare a powder ball plate;
(2) Preparing PEEK granules into sheets by using a hot pressing mode;
(3) Laying a modified PEEK sheet on the ball powder plate;
(4) Putting the ball powder plate on which the modified PEEK sheet is laid into a nitrogen protection mesh belt furnace at the temperature of 350 ℃ for plasticizing for 20min;
(5) Rapidly taking out the plasticized PEEK composite plate from the outlet end of the mesh belt furnace, putting the plasticized PEEK composite plate into a heating rolling mill with an oil cavity roller, rolling the heated rolling mill at the temperature of 250 ℃ to obtain a modified PEEK three-layer composite plate with the oil cavity, wherein the thickness of the three-layer composite plate is 3.02mm, and the depth of the oil cavity is 0.20mm; (ii) a
(6) Air cooling the prepared modified PEEK three-layer composite board with the oil holes; putting the cooled modified PEEK three-layer composite board with the oil holes into a smooth roll mill to roll a board with the required thickness, wherein the rolling amount is 0.02mm;
(7) Blanking, namely blanking according to the specification of the bearing; the modified PEEK three-layer composite shaft sleeve with the oil holes is manufactured by rolling and inner shaping.
Test example 1:
the number of steps, process equipment, process time and personnel required from material spreading to completion of plate manufacturing in the first comparative example, the first comparative example and the second comparative example are shown in the following table 1.
TABLE 1
From the above table for comparative example one and comparative example one it can be seen that: from material spreading to plate making, the embodiment has 2 less processes, 2 less equipment, 0.5h less process time, 2 less personnel and 36.7 percent reduction of the occupied area of the equipment through calculation compared with the embodiment (the embodiment has 62m of the occupied area of the equipment) 2 The area of the left and right comparative example site needs 98m 2 About), the production efficiency is improved by 33%. In addition, the first comparative example needs two times of plasticization and rolling, the required gas cost and electricity cost are also increased, and the cost of the plate of the first comparative example is increased by 6.25 percent (the manufacturing cost of the example 1 is 800 yuan/m) 2 The manufacturing cost of the left and right comparative examples 1 is 850 yuan/m 2 About), in annual yield 6000m 2 The cost can be saved by 30 ten thousand yuan per year.
As can be seen from the above table of the first comparative example and the first comparative example, the number of processes, the number of devices and the number of personnel are consistent from the material spreading to the plate manufacturing, and the cost of the calculated plate is basically consistent, but the production efficiency of the first example is 75% higher than that of the second comparative example.
Test example 2:
the interlayer bonding strength and the frictional wear performance of the modified PEEK three-layer composite plates prepared in the first example, the second example, the third example, the fourth example and the fifth example are compared with those of the first comparative example and the second comparative example.
Wherein, the interlayer bonding strength is tested by a one-time bending method, the size of the sample is 120mm multiplied by 20mm multiplied by the actual thickness of the plate, and the specific operation steps are as follows:
a) Clamping the sample by a bench vice at a position of about 1/3 to 1/2 of the length of the sample;
b) Bending the sample by 180 degrees towards the direction of the steel plate by hands or tools, and ensuring that the bending radian is less than or equal to 5 times of the wall thickness;
c) Carefully observing the sample, the phenomena of delamination and peeling of the plastic layer and the alloy layer, and the alloy layer and the steel back layer are avoided, but cracking is allowed;
d) If a failure such as delamination or peeling occurs in the middle of the test, the test is terminated and the product is judged to be defective.
The plastic surface tested according to the method allows cracks but does not allow delamination and peeling; the intermediate sintering layer and the steel plate should not be layered or peeled off.
The friction performance is tested by adopting an end surface friction and wear testing machine, and the testing conditions are as follows: the load is 3.5MPa, the sliding linear velocity is 0.4m/s, the lubricating oil is 32# mechanical oil, and the time is 3h. The friction reducing effect of the material is compared by the magnitude of the friction factor.
The abrasion performance is tested by adopting a swing testing machine, and the testing conditions are as follows: 180KN, a swing speed of 19.6 degrees/s, a swing angle of +/-45 degrees and a time duration of 100h. The abrasion resistance effect of the material is compared by measuring the abrasion loss of the shaft sleeve.
The results of the testing are shown in table 2 below:
TABLE 2
| Interlayer bonding strength | Coefficient of friction | Abrasion loss mm | |
| Example one | Qualified | 0.022 | 0.03 |
| Example two | Qualified | 0.019 | 0.04 |
| EXAMPLE III | Qualified | 0.02 | 0.033 |
| Example four | Qualified | 0.023 | 0.039 |
| EXAMPLE five | Qualified | 0.024 | 0.07 |
| Comparative example 1 | Qualified | 0.035 | 0.08 |
| Comparative example No. two | Qualified | 0.028 | 0.06 |
The test results show that (1) the results of the first comparative example, the second comparative example and the third comparative example show that the interlayer bonding strength and the frictional wear performance of the prepared material are stable by using the process range; (2) Comparing the results of the first, fourth and fifth examples, it is understood that the depth of the oil pocket is 0.2mm to 0.4mm, the interlayer bonding strength and the frictional wear performance are not greatly different, and the wear amount is increased by 2.33 times when the depth of the oil pocket is 0.5mm, which is the same as that of the oil pocket in the first example. When the depth of the oil pocket exceeds a certain range value, the supporting effect of the base body is reduced, and the base body material is disturbed in the swinging process of the rotating shaft, so that the moving process is unstable, the material is more easily damaged in the unstable moving process, and the frictional wear performance is reduced. The oil pockets are not likely to be too deep.
The bonding strength between the layers of the plate rolled by the particle material and the sheet material of the modified PEEK meets the requirements, but in the first comparative example, secondary plasticization is adopted, so that the friction reduction performance and the wear resistance performance are greatly reduced compared with the plate plasticized once in the first example, the friction factor of the first comparative example is 1.59 times that of the first example, and the wear loss is 2.67 times that of the first example; the comparative example II, which was rolled from a sheet material and had a friction factor 1.27 times that of the example I, and the comparative example II, which had a wear amount of the sleeve 2 times that of the annealed sleeve in the example I because it was not annealed, showed extremely poor wear resistance of the material of the comparative example II.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications can be made to the embodiments and the generic principles defined herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the section is not limited to the embodiments, and those skilled in the art should, in light of the disclosure of the section, make modifications and changes within the scope of the section without departing from the scope of the section.
Claims (8)
1. A forming method of a modified PEEK three-layer composite shaft sleeve with oil holes is characterized in that: the forming method comprises the following steps:
(1) Sintering a porous copper powder layer on a metal substrate to manufacture a spherical powder plate;
(2) Brushing or spraying a wetting agent on the surface of the ball flour board to wet the surface of the ball flour board;
(3) Spreading dry modified PEEK granules on the wet surface of the ball powder plate, and then drying;
(4) Plasticizing in a mesh belt furnace with protective gas;
(5) Rapidly taking out the plasticized PEEK three-layer composite plate from the outlet end of the mesh belt furnace, immediately putting the plate into a heating rolling mill with an oil cavity roller, and rolling oil cavities on the surface of the plate;
(6) After cooling, putting the plate into a smooth roll mill to roll the plate with the required thickness, wherein the rolling amount is 0.02mm-0.10mm;
(7) Blanking, rolling and internally shaping to prepare the modified PEEK three-layer composite shaft sleeve with the oil holes;
(8) And annealing to obtain the finished shaft sleeve.
2. The molding method according to claim 1, wherein: in the step (2), the wetting agent is PEEK dispersion liquid or PAI dispersion liquid.
3. The molding method according to claim 1, wherein: in the step (3), the dried modified PEEK granules are dried in an oven at 100-200 ℃ for 3-5h; and the secondary drying is to place the ball powder plate paved with the modified PEEK granules into a mesh belt furnace at the temperature of 105-200 ℃ to dry for 20-40 min.
4. The molding method according to claim 1, wherein: in the step (4), the protective gas is nitrogen or inert gas; the plasticizing temperature in the mesh belt furnace is 350-415 ℃, and the plasticizing time is 5-20min.
5. The molding method according to claim 1, wherein: in the step (5), the temperature of the heating rolling mill is 100-250 ℃.
6. The molding method according to claim 1, wherein: in the step (5), the depth of the oil pocket is 0.2mm-0.4mm.
7. The molding method according to claim 1, wherein: in the step (6), cooling refers to air cooling or water cooling.
8. The molding method according to claim 1, wherein: in the step (8), annealing is to anneal the oil-hole-containing modified PEEK three-layer composite shaft sleeve for 1 to 5 hours at the temperature of between 220 and 280 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211529787.1A CN115853906A (en) | 2022-11-30 | 2022-11-30 | Forming method of modified PEEK three-layer composite shaft sleeve with oil holes |
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| CN202211529787.1A CN115853906A (en) | 2022-11-30 | 2022-11-30 | Forming method of modified PEEK three-layer composite shaft sleeve with oil holes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115339171A (en) * | 2022-07-22 | 2022-11-15 | 嘉善双飞润滑材料有限公司 | Three-layer composite material of shaft sleeve for oil pump and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115339171A (en) * | 2022-07-22 | 2022-11-15 | 嘉善双飞润滑材料有限公司 | Three-layer composite material of shaft sleeve for oil pump and preparation method thereof |
| CN115339171B (en) * | 2022-07-22 | 2024-06-11 | 嘉善双飞润滑材料有限公司 | Three-layer composite material of shaft sleeve for oil pump and preparation method thereof |
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