JP2000320556A - High lubricating resin covered sliding material and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give consideration to environment, where Pb is not used by providing a bronze porous metallic sintered layer adhered to a back plate and a surface resin layer whose one part is impregnated into and adhered to the bronze porous metallic sintered layer, and constituting the surface resin layer by a specified quantity of a aromatic polyamide resin powder having and polytetrafluoroethylene resin. SOLUTION: A resin-covered sliding material 20 is formed, in such a way that polytetrafluoroethylene resin(PTFE) mixed with aromatic polyamide resin powder 24 of 5 to 30 volume% is impregnated into a bronze porous metallic sintered layer 22 on a back plate 21, and covered with a surface resin layer 23. When an oilless bearing of the sliding material 20 is initially abraded by running-in, the resin powder 24 is exposed on a surface of the surface resin layer 23, the PTFE of the matrix is moved and fitted to a surface of the resin powder 24 to suppress raising of a frictional coefficient. The abrasion resistance of the resin fine particle 24 is improved, low frictional performance of the PTFE is brought out, and lubrication having durability is obtained on the resin layer 23. It is thus possible to obtain lubrication with high durability without the use of Pb, and it is also possible to carry out sliding without fluctuating the frictional coefficient.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly lubricated resin-coated sliding material and a method for producing the same, and more particularly to a highly lubricated resin-coated sliding material for an oil-free bearing that does not use Pb and a method for producing the same.

[0002]

2. Description of the Related Art Oil-free bearings generally known in the past have been widely used in sliding and rotating parts of automobiles and home electric appliances.

[0003] These oil-free bearings are used as effective parts in places where it is desired to prevent contamination by oil such as food machines and household appliances, and in places where lubrication is difficult or impossible such as copying machines and printers. The coated sliding material is used as a bush or a thrust washer.

FIG. 7 is a cross-sectional view schematically showing a cross section of a conventional resin-coated sliding member 10. 11 is a back metal such as a steel plate,
Reference numeral 12 denotes a porous metal sintered layer of lead bronze, and reference numeral 13 denotes a surface resin layer containing lead.

[0005] The resin-coated sliding member 10 is made of a backing metal 1 such as a steel plate.
1, a porous metal sintered layer 12 of lead bronze is formed, and the porous metal sintered layer 12 is impregnated with an ethylene tetrafluoride resin mixed with Pb, and a surface resin layer 13 is applied. .

When the lubricating bearing formed by the resin-coated sliding member 10 is subjected to a running-in operation, the surface of the surface resin layer 13 is made of ethylene tetrafluoride resin and PbO of Pb mixed in the surface resin layer 13. Since a mixed film is formed and PbO is also a lubricating component, it is possible to obtain abrasion resistance and low friction characteristics.

[0007]

However, the conventional resin-coated sliding member 10 has the following problems.

As described above, the resin-coated sliding member 10 is
It has lubrication performance with wear resistance and low friction, and can be used as an oil-free bearing for bearings. Oil-free bearings can be used in places where oil contamination is desired or where lubrication is difficult or impossible. Used as valid.

However, in recent years, the use of Pb has been restricted from the environmental point of view, and there has been a problem that non-use of Pb has been required.

The present invention has been made in view of the above problems, and provides a highly lubricated resin-coated sliding material having high lubricating performance in consideration of environment without using Pb which is a lubricating component, and a method of manufacturing the same. The purpose is to do.

[0011]

The high lubricating resin-coated sliding material of the present invention has a porous metal sintered layer of bronze formed on a back metal, and a part of the metal sintered layer is impregnated with the porous metal sintered layer. And a surface resin layer adhered and formed in such a state that the aromatic polyamide resin powder is 5 to 30% by volume, with the balance being ethylene tetrafluoride resin.

Further, the sliding material coated with a high lubricating resin of the present invention comprises:
A bronze porous metal sintered layer adhered and formed on a back metal, and a surface resin layer adhered and formed in a state in which the bronze is partially impregnated in the metal sintered layer, wherein the surface resin layer is aromatic. It is characterized in that the polyamide resin powder is 5 to 30% by volume, the solid lubricant is 1 to 10% by volume, and the balance is ethylene tetrafluoride resin.

[0013] Further, the aromatic polyamide resin powder comprises:
It has a chemical composition of polymetaphenylene isophthalamide and has an average particle size of 5 to 50 μm.

Further, the solid lubricant is made of graphite, molybdenum disulfide and / or a low molecular weight tetrafluoroethylene resin having a molecular weight of 600,000 or less, and has an average particle diameter of 10 μm or less.

Further, the method for producing a highly lubricated resin-coated sliding material of the present invention is characterized in that an aromatic polyamide resin powder and an ethylene tetrafluoride resin are applied to a bronze porous metal sintered layer formed on a back metal. Or a mixture of an aromatic polyamide resin powder, a solid lubricant and a tetrafluoroethylene resin, impregnated with the mixture and fired to produce a resin-coated sliding material. Using, after wetting a solution containing an organic solvent as a main component on at least the surface of the fine powder, the aromatic polyamide resin powder or the aromatic polyamide resin powder and solid lubricant are adhered to the fine powder. The porous metal sintered layer of bronze is impregnated and coated, followed by firing.

[0016]

Embodiments of the present invention will be described below.

FIG. 1 is a cross-sectional view schematically showing a cross section of a resin-coated sliding member 20 according to a first embodiment of the present invention.
Reference numeral 21 denotes a back metal such as a steel plate, 22 denotes a porous metal sintered layer of bronze, 23 denotes a surface resin layer, and 24 denotes an aromatic polyamide resin powder.

The bronze porous metal sintered layer 22 is formed by spraying an alloy powder of Cu and Sn on a back metal 21 such as a steel plate, and then sintering the powder to form a porous metal sintered layer of Cu-10% Sn. Is formed. The resin-coated sliding material 20 impregnates the porous metal sintered layer 22 of bronze with an ethylene tetrafluoride resin (hereinafter, PTFE) mixed with an aromatic polyamide resin powder 24 to cover the surface resin layer 23. It is what I wore.

When the oil-free bearing formed by the resin-coated sliding member 20 is run in and the initial running-in wear is performed, the aromatic polyamide resin powder 24 is exposed on the surface of the surface resin layer 23. Certain PTFE is transferred to the surface of the aromatic polyamide resin powder 24, and the increase in the coefficient of friction is suppressed to stabilize. The aromatic polyamide resin powder 24 is
It has excellent abrasion resistance and can support the load, and can draw out the low friction property inherent to PTFE.
Means that durable lubrication can be obtained. The resin-coated sliding member 20 undergoes conformal wear in a short time and thereafter exhibits extremely gentle wear characteristics (a wear characteristic diagram is shown in FIG. 2).

The method of manufacturing the resin-coated sliding material 20 of the present invention is as follows. A copper and Sn alloy powder is sprayed on a back metal 21 of a steel plate or the like (including a copper-plated steel plate) to form a porous bronze metal sintered layer. After a solution containing an organic solvent is moistened on the surface of the fine powder of PTFE, an aromatic polyamide resin powder 24 is adhered to the fine powder, and the surface of the porous metal sintered layer 22 of bronze is formed. And impregnated and coated with a roll or the like, and then fired to form a surface resin layer 23.

The aromatic polyamide resin powder 24 is made of PTF
E is added to improve the wear resistance of E. Since the average particle size of the aromatic polyamide resin powder 24 is 5 to 50 μm, the aromatic polyamide resin powder 24 is adhered to the surface of the moistened PTFE fine powder having an average particle size of about 500 μm. When the surface resin layer 23 is formed by spraying on the sintered layer 22 and then impregnating and coating with a roll,
The aromatic polyamide resin powder 24 can be uniformly dispersed without segregation.

Next, a description will be given of a friction and wear test performed on a sample of the resin-coated sliding member 20 of the present invention. In the friction and wear test, the load was 60 kgf / cm ² , and the peripheral speed was 15 m / mi.
n, and the test time was 1 hour.

Table 1 shows the composition of the test samples Nos. 1 to 9 and the test results. Sample Nos. 1 to 9 are Cu-1
0% Sn bronze porous metal sintered layer 22 with surface resin layer 2
The surface resin layer 23 has a predetermined volume% of PTFE and a predetermined volume% of an aromatic polyamide resin powder 24 (however, the sample No. 9 is an aromatic polyamide resin). (Fiber).

The aromatic polyamide resin powder 24 can be obtained by pulverizing a polymer having a particle diameter of 200 μm with a powder having an average particle diameter of 5 to 50 μm containing polymetaphenylene isophthalamide (MPIA) as a component. Sample No. 9
The aromatic polyamide resin fiber is an aramid fiber containing the MPIA as a component, having a fiber diameter of 14 μm and a fiber length of 650 μm.

The test results of Sample Nos. 1 to 9 are shown on the right side of Table 1. From the test results, a graph of the amount of the aromatic polyamide resin powder added and the amount of wear is shown in FIG. 3, and a graph of the amount of the aromatic polyamide resin powder added and the coefficient of friction is shown in FIG.
The test results of sample Nos. 1 to 9 show that when the amount of the aromatic polyamide resin powder 24 is in the range of 5 to 30% by volume, the friction coefficient and the wear amount are generally in a relatively low range. When the amount of the powder 24 is less than 5% by volume, the amount of the aromatic polyamide resin powder 24 is small and the wear resistance is insufficient, so that the effect of addition does not appear and the wear resistance is reduced. The holding force of the aromatic polyamide resin powder 24 is weakened, and the wear resistance is reduced. In addition,
When the sample No. 9 aromatic polyamide resin fiber (aramid fiber) was added, the wear resistance was considerably lower than that of the aromatic polyamide resin powder, and the friction coefficient was slightly higher.

Also, the conformal wear between the bearing surface and the shaft is completed at an early stage, and the surface resin layer 23 is provided with durable lubrication.
Stable sliding was performed. As described above, the resin-coated sliding member 20 of the first embodiment can achieve lubrication performance with wear resistance and low friction without using Pb.

FIG. 5 is a sectional view schematically showing a section of a resin-coated sliding member 30 according to a second embodiment of the present invention.
Reference numeral 21 denotes a back metal such as a steel plate, 32 denotes a porous metal sintered layer of bronze, 33 denotes a surface resin layer, 24 denotes an aromatic polyamide resin powder, and 35 denotes a solid lubricant.

As in the first embodiment, the bronze porous metal sintered layer 32 is formed by spraying an alloy powder of Cu and Sn on the back metal 21 of a steel plate or the like (including a steel plate coated with copper). Sintered to form a Cu-10% Sn porous metal sintered layer. The resin-coated sliding material 30 impregnates the porous metal sintered layer 32 of bronze with PTFE in which the aromatic polyamide resin powder 24 and the solid lubricant 35 are mixed.
3 is attached. The solid lubricant 35 is made of graphite, molybdenum disulfide (hereinafter, MoS ₂ ), low molecular weight PTFE having a molecular weight of 600,000 or less, or the like, and has an average particle diameter of 10 μm or less, and is added alone or at least two kinds.

After the abrasion, the aromatic polyamide resin powder is exposed on the bearing surface, but in a low speed region, PTFE as a matrix is transferred to the surface of the aromatic polyamide resin powder 24 to suppress the increase in the coefficient of friction and stabilize. I do. Even in the high-speed region, by adding a solid lubricant, a mixed film of PTFE and the solid lubricant can be formed on the surface of the aromatic polyamide resin powder, so that the friction coefficient can be kept lower and more stable. If the addition of the solid lubricant is 1% or less, there is no effect, and if it is 10% or more, the wear resistance of the mixed film decreases.

When the sliding wear of the resin-coated sliding member 30 is performed, the aromatic polyamide resin powder 24 is exposed on the surface of the surface resin layer 33. The aromatic polyamide resin powder 24 is
It is excellent in abrasion resistance, can support a load, and can bring out the low abrasion property of PTFE, and the surface resin layer 33 can obtain durable lubrication in addition to the effect of the addition of the solid lubricant 35. The familiar wear of the resin-coated sliding member 30 is as follows.
It is carried out in a short time and thereafter shows a very gentle wear characteristic.

The method of manufacturing the resin-coated sliding member 30 of the present invention is similar to that of the resin-coated sliding member 20 of the first embodiment. A porous metal sintered layer 32 is formed on the surface of the PTFE fine powder, and a solution containing an organic solvent is wetted on the surface of the PTFE fine powder.
4 and a solid lubricant 35 are adhered, and the porous metal sintered layer 32 of bronze is impregnated and coated, and then fired to form a surface resin layer 33.

Next, a description will be given of a friction and wear test performed on a sample of the resin-coated sliding member 30 of the present invention. In the friction and wear test, the load was 60 kgf / cm ² , and the peripheral speed was 15 m / mi.
n, and the test time was 1 hour. Table 2 shows the composition components and test results of test sample Nos. 10 to 15 for testing. Sample Nos. 10 to 15 are each obtained by forming a surface resin layer 33 on a porous metal sintered layer 32 of bronze of Cu-10% Sn. The surface resin layer 33 has a predetermined volume% of P
TFE, a predetermined volume% of the aromatic polyamide resin powder 24, and a predetermined volume% of a solid lubricant 35 (MoS
₂ , graphite or low molecular weight PTFE).

The test results of Sample Nos. 10 to 15 are shown on the right side of Table 2. The test results of sample Nos. 10 to 15 show that the friction coefficient is about the same as or slightly lower than that of the conventional resin-coated sliding material 10 due to the mixing of a predetermined volume% of solid lubricant composition.
The amount of wear is also about the same. As described above, it can be seen that the addition effect of the solid lubricant is not more than 1%, and that the addition film is less than 10%, the wear resistance of the mixed film is reduced. In sample Nos. 10 to 15, the bearing surface and the shaft were quickly subjected to conformal wear, the surface resin layer 33 was provided with durable lubrication, and the friction coefficient was stable with no fluctuation. Had been done.

Table 3 shows a sample No. 16 having the same composition as the sample of the resin-coated sliding member 30 of the second embodiment shown in Table 2.
21 shows the results of a friction and wear test in which the peripheral speed was doubled to 30 m / min and the test time was extended to 5 hours. PV value is 900 kgf / cm ² · m /
min to 1800Kgf / cm ² · m / min and 2
The coefficient of friction shows the same value as in Table 2 even if it doubles,
It can be seen that the amount of abrasion is in a good range with only a slight increase. Sample No. 22 was a test in which the solid lubricant 35 was not added, and the wear amount increased and the friction coefficient also changed.

FIG. 6 shows the relationship between the amount of MoS ₂ added and the amount of wear based on the test results. It can be seen that the addition of MoS ₂ suppresses an increase in the amount of wear of the resin-coated sliding member 30. Thus, the effect of adding MoS ₂ with increasing PV value becomes remarkable, MoS ₂ serves to improve the abrasion resistance while maintaining low friction by suppressing variation of the friction coefficient.

As described above, the resin-coated sliding member 30 of the second embodiment
Can achieve high lubricating performance having both high wear resistance and low friction without using Pb.

The above-described resin-coated sliding members 20, 30
Has been described with respect to an example in which the bearing is used for an oilless bearing, but the invention is not limited to this and can be used as various sliding members.

[0038]

The sliding material coated with a highly lubricating resin of the present invention has a porous metal sintered layer of bronze formed on a backing metal and a partially impregnated metal sintered layer. A surface resin layer formed by adhesion. The surface resin layer is composed of 5 to 30% by volume of an aromatic polyamide resin powder, and the balance is made of PTFE. Lubrication performance. In addition, premature wear is completed early, and the surface resin layer has durable lubrication,
Stable sliding is performed.

The highly lubricated resin-coated sliding material of the present invention comprises:
A porous metal sintered layer of bronze adhered and formed on the back metal, and a surface resin layer adhered and formed in a state where the surface sintered resin is partially impregnated in the metal sintered layer; Lubricating material having high abrasion resistance and low friction without using Pb because the polyamide resin powder is 5 to 30% by volume, the solid lubricant is 1 to 10% by volume, and the balance is PTFE. Performance can be. In addition, familiar wear between the bearing surface and the shaft is completed at an early stage, a highly durable lubrication is obtained on the surface resin layer, and stable sliding with no change in the friction coefficient is performed.

Further, the aromatic polyamide resin powder comprises:
It has a chemical composition of polymetaphenylene isophthalamide and has an average particle size of 5 to 50 μm.
It can be uniformly mixed with 00 μm PTFE fine powder, and a uniform film can be obtained without segregation. As a result, the low wear property inherent to PTFE can be brought out.

The solid lubricant may be graphite, MoS ₂
And / or a low molecular weight PTFE having a molecular weight of 600,000 or less, and an average particle diameter of 10 μm or less, so that the PTFE is uniformly dispersed between the aromatic polyamide resin powder and the surface of the aromatic polyamide resin powder. The mixed film of the solid lubricant can be formed accurately, and the friction coefficient can be kept lower and stable.

Further, the method for producing a highly lubricated resin-coated sliding material of the present invention is characterized in that a bronze porous metal sintered layer formed on a back metal is mixed with an aromatic polyamide resin powder and PTFE. When producing a resin-coated sliding material by impregnating with a mixture of an aromatic polyamide resin powder, a solid lubricant, and PTFE and coating and firing, a fine powder is used as the PTFE, and at least a surface of the fine powder is coated with an organic solvent. After wetting the solution containing, the aromatic polyamide resin powder or the aromatic polyamide resin powder and a solid lubricant are adhered to the fine powder, and the porous metal sintered layer of bronze is impregnated and coated. In addition, the resin-coated sliding material can be manufactured accurately and easily because it is applied by firing.

[0043]

[Table 1] ・ Test conditions ・ Load 60Kgf / cm ²・ Peripheral speed 15m / min ・ Time 1 hour ・ Lubrication dry ・ Tester Suzuki friction and wear tester ・ Unit volume% of resin layer composition component

[0044]

[Table 2] ・ Test conditions ・ Load 60Kgf / cm ²・ Peripheral speed 15m / min ・ Time 1 hour ・ Lubrication dry ・ Tester Suzuki friction and wear tester ・ Unit volume% of resin layer composition component

[0045]

[Table 3] ・ Test conditions ・ Load 60Kgf / cm ²・ Peripheral speed 30m / min ・ Time 5 hours ・ Lubrication dry ・ Tester Suzuki friction and wear tester ・ Unit volume% of resin layer composition component

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a cross section of a resin-coated sliding member of a first embodiment according to the present invention.

FIG. 2 shows the amount of wear of a resin-coated sliding material with respect to a test time in a wear test.

FIG. 3 is a graph showing the amount of aromatic polyamide resin powder added and the abrasion resistance based on the results of the friction and abrasion test.

FIG. 4 is a graph showing the amount of the aromatic polyamide resin powder added and the wear characteristics based on the results of the friction and wear test.

FIG. 5 is a cross-sectional view schematically showing a cross section of a resin-coated sliding member of a second embodiment according to the present invention.

FIG. 6 is a graph showing the amount of MoS ₂ added and abrasion resistance based on the results of a friction and wear test.

FIG. 7 is a cross-sectional view schematically showing a cross section of a conventional resin-coated sliding member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Conventional resin-coated sliding material 11, 21 Backing metal such as steel plate 12 Porous metal sintered layer 13 Surface resin layer containing lead 20, 30 Resin-coated sliding material 22, 32 Bronze porous metal sintered layer 23, 33 Surface resin layer 24 Aromatic polyamide resin powder 35 Solid lubricant

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Mitsunori Sato 1-687, Minemachi, Narashino-shi, Chiba F-term in NDC Corporation (reference) 3J011 DA02 QA05 SB03 SB05 SB19 SC03 SC05 SE02 SE06 4F100 AA09C AA37C AB01A AB03 AB17B AB21B AB31B AK01C AK18C AK46C BA03 BA10A BA10C CA19C DD09 DE01C DJ00B EJ482 EJ822 GB51 JA07C JK09 YY00C

Claims (5)

[Claims] 1. A bronze porous metal sintered layer formed on a back metal, and a surface resin layer formed by being partially impregnated in the metal sintered layer. A highly lubricated resin-coated sliding material, characterized in that the resin layer comprises 5 to 30% by volume of an aromatic polyamide resin powder and the remainder is ethylene tetrafluoride resin. 2. A sintered body comprising: a bronze porous metal sintered layer formed on a back metal; and a surface resin layer formed by being partially impregnated in the metal sintered layer. The resin layer comprises a high lubricating resin-coated sliding material, comprising 5 to 30% by volume of an aromatic polyamide resin powder, 1 to 10% by volume of a solid lubricant, and a balance of ethylene tetrafluoride resin. . 3. The aromatic polyamide resin powder has a chemical composition of polymetaphenylene isophthalamide,
The highly lubricated resin-coated sliding material according to claim 1 or 2, wherein the average particle diameter is 5 to 50 µm. 4. The solid lubricant is composed of graphite, molybdenum disulfide and / or a low molecular weight ethylene tetrafluoride resin having a molecular weight of 600,000 or less, and has an average particle diameter of 10 μm or less. Item 3. A highly lubricated resin-coated sliding material according to Item 2. 5. A mixture of an aromatic polyamide resin powder and an ethylene tetrafluoride resin, or a mixture of an aromatic polyamide resin powder and a solid lubricant, for a porous bronze metal sintered layer formed on a back metal. When a resin-coated sliding material is manufactured by impregnating with a mixture consisting of ethylene tetrafluoride resin and coating and firing, a fine powder is used as the tetrafluoroethylene resin, and an organic solvent is used as a main component on at least the surface of the fine powder. After wetting the solution containing, the aromatic polyamide resin powder or the aromatic polyamide resin powder and a solid lubricant are adhered to the fine powder, and the porous metal sintered layer of bronze is impregnated and coated. A method for producing a highly lubricated resin-coated sliding material, which is applied by firing.