KR100584473B1 - Friction pad for friction pot bearing and manufacturing method of the pad - Google Patents

Abstract

The present invention supports the vertical and horizontal loads of large structures such as bridges, building structures, LNG tanks, etc., as well as solids in the friction port support used to dissipate energy by using friction attenuation generated by sliding with friction. A friction plate, which acts as a lubricant, is a method of manufacturing a friction plate for a friction port bearing in which a composition mainly composed of a fluorine resin is placed in a mold and pressure-molded, wherein the composition uses polytetrafluoroethylene as a fluorine resin. And 10 to 80 parts by weight of glass fiber pulverized to a particle size of 150 to 300 mesh with respect to 100 parts by weight of polytetrafluoroethylene, and the method of manufacturing a friction plate for a friction plate support, It provides a friction plate for the friction plate support characterized in that.

Description

Friction plate for friction pot support and manufacturing method thereof {Friction pad for friction pot bearing and manufacturing method of the pad}             

1 is a view schematically showing a friction port bearing applied to a bridge.

The present invention relates to a friction plate support friction plate, and more particularly, to support the vertical and horizontal loads of large structures such as bridges, building structures, LNG tanks, etc., and to use friction attenuation generated by sliding with friction. The present invention relates to a friction plate serving as a solid lubricant in a friction pot support used for dissipating energy.

In general, a friction port support is used to support vertical and horizontal loads in large structures such as bridges, building structures, LNG tanks, etc. and to dissipate energy by using friction attenuation caused by slipping with friction. A friction plate serving as a lubricant made of a fluororesin-based resin is formed on the upper surface of the friction pot support.

For example, the bridge is provided with a friction port support between the upper structure and the pier, more specifically, as shown in Figure 1 the upper base plate is attached to the sliding plate 120 on the bottom side of the upper structure 200 of the bridge 110 is formed, the friction port support having a structure in which the rubber pad 140 and the piston 150 are sequentially inserted into the mounting groove 131 formed on the upper surface of the lower support 130 on the upper side of the pier 300. 100 is installed. Here, the upper surface of the piston 150 is formed of a friction plate 160 made of fluorine resin having a low coefficient of friction and excellent acupressure, and accordingly the upper structure 200 by the contact of the sliding plate 120 and the friction plate 160. To accommodate the displacement caused by the horizontal load acting on.

In the accompanying drawings of FIG. 1, the friction port support has been described as an example, but the friction port support may have a slightly different configuration depending on the environment or building to which it is applied, but essentially includes a friction plate. Here, when the friction plate has a high friction coefficient, there is a problem in that the wear resistance is lowered and the durability is lowered, so that the friction plate is designed and manufactured to have the lowest friction coefficient as possible.

In consideration of the low coefficient of friction and lubricity, most of the friction plates are manufactured by inserting a fluorine-based resin into a mold and press molding. In general, polytetrafluoroethylene (hereinafter referred to as 'PTFE') is used as the fluorine-based resin. PTFE has self-lubricating properties and excellent wear resistance compared to other resins, and has a low coefficient of friction, which is indispensable for the manufacture of almost all friction plate bearing plates.

 A friction plate manufactured using only PTFE has an advantage of low durability and excellent wear resistance due to a low coefficient of friction. However, the energy dissipation capacity due to friction attenuation caused by the sliding with friction has a disadvantage. In particular, when an earthquake occurs, a large shear force is generated in the bottom layer of the structure by the inertia force of the upper structure. When the friction coefficient of the friction plate is too low, the shear force may cause the separation of the upper structure and the friction damping effect. There is a problem that the energy dissipation capacity is reduced by half.

Accordingly, it is possible to prevent the degradation of durability due to the wear resistance of the friction plate, which is a problem that occurs when the friction coefficient is too high, and at the same time, to prevent the degradation of energy dissipation performance by using the friction damping that occurs when the friction coefficient is too low. There is a need for a friction plate having a coefficient of friction in the range. Due to this demand, the present inventors completed the present invention after studying to manufacture a friction plate having excellent wear resistance and excellent energy dissipation performance by increasing the friction coefficient of the existing friction plate to an appropriate level.

Accordingly, the present invention provides a friction plate support friction plate that can have a high frictional resistance and excellent energy dissipation ability while having a slightly higher coefficient of friction than the friction plate used in the conventional friction port support. have.

Another object of the present invention is to provide a method of manufacturing a friction plate support friction plate for producing the friction plate support friction plate.

In another aspect, the present invention is to provide a friction port support including a friction plate produced by the manufacturing method.

In order to achieve the above object, the present invention is a method for producing a friction plate support friction plate which is formed by pressing a composition mainly composed of fluorine resin in a mold, the composition is a polytetrafluoroethylene (Polytetrafluoroethylene) as a fluorine resin It provides a method for producing a friction plate support friction plate comprising 10 to 80 parts by weight of glass fiber pulverized to a particle size of 150 to 300 mesh with respect to 100 parts by weight of polytetrafluoroethylene.

In another aspect, the present invention provides a friction plate support friction plate, characterized in that the friction coefficient is in the range of 0.07 ~ 0.2 when the acupressure stress is 5-25MPa.

In another aspect, the present invention provides a friction port support, characterized in that it comprises a friction plate having a friction coefficient in the range of 0.07 to 0.2 when the acupressure stress is 5-25MPa.

Hereinafter, the present invention will be described in more detail.

The method for producing a friction plate bearing friction plate according to the present invention is to put a composition containing 10 to 80 parts by weight of crushed glass fibers with respect to 100 parts by weight of a fluororesin into a mold and press molding.

That is, the present invention, unlike the conventional manufacturing method for producing a friction plate with only a fluorine coefficient, to prepare a composition by adding and mixing the crushed glass fiber in the fluorine resin, and then put the composition into a mold to press-molded to produce a friction plate It has its features. As such, when the composition obtained by further adding crushed glass fibers to the fluorine-based resin is used in the manufacture of the friction plate, the friction coefficient of the friction plate is slightly increased by the crushed glass fibers.

At this time, the friction coefficient of the friction plate may be changed depending on where the friction port support is applied and the characteristics of the structure. Preferably, the friction coefficient is in the range of 0.07 to 0.2 when the acupressure stress is 5 to 25 MPa.

If the friction plate has a friction coefficient within the above range, the friction coefficient is not too low, so it not only has an effect of holding the upper structure in the event of an earthquake, but also exhibits excellent energy dissipation performance due to friction attenuation due to frictional force when the upper structure slips. In addition, the friction coefficient is not so high that the wear resistance is not too low to prevent a significant decrease in durability.

In the present invention, in order to have a friction coefficient within the above range, the pulverized glass fiber is added to the fluorine-based resin, but when the content of the pulverized glass fiber is added to less than 10 parts by weight with respect to 100 parts by weight of the fluorine resin, the friction coefficient is too high. When the earthquake occurs, the energy dissipation effect may not be sufficiently exerted, resulting in a breakdown or collapse of the structure.When the amount of crushed glass fibers exceeds 80 parts by weight, the frictional force is too high, which significantly reduces the wear resistance of the friction plate. Therefore, it is preferable to add 10-80 weight part of crushed glass fibers with respect to 100 weight part of fluororesins.

In this case, it is important to use the crushed glass fiber having a particle size of 150 to 300 mesh, but if the crushed glass fiber has a particle size of less than 150 mesh, the friction coefficient becomes too high, and the wear resistance of the friction plate is inferior. When the ratio exceeds 300 mesh, the increase in the friction coefficient due to the addition of the pulverized glass fiber is slowed down, so that it is difficult to control the friction coefficient and the added effect is halved. It is good to use

The fluorine resin mixed with the pulverized glass fiber may be selected from those generally used in the manufacture of the friction plate. Preferably, polytetrafluoro is widely used in the manufacture of the friction plate due to its excellent self-lubrication and wear resistance and low coefficient of friction. Polyethylene (Polytetra fluoro ethylene (hereinafter referred to as PTFE)) is preferably used.

In the case of the friction plate manufactured using the composition containing the glass fiber pulverized in the fluorine resin as described above, the friction coefficient is slightly higher than that of the conventional friction plate made of fluorine-based resin, so that the energy dissipation effect due to friction reduction is excellent, which effectively prevents earthquakes. You can cope.

However, in the case of the friction plate prepared by adding crushed glass fiber to the fluorine resin as in the present invention, the wear resistance is somewhat lower than that of the friction plate produced using only the fluorine resin, and to supplement this, the molybdenum di It is preferable to further add sulfide and inorganic filler.

At this time, when the amount of molybdenum disulfide added is less than 5 parts by weight based on 100 parts by weight of fluorine-based resin, there is a disadvantage in that a sufficient wear resistance improvement effect cannot be obtained. When the amount exceeds 40 parts by weight, the content of fluorine-based resin is relatively high. Since the friction coefficient is increased to reduce the wear resistance, the molybdenum disulfide is preferably added in an amount of 5 to 40 parts by weight based on 100 parts by weight of the fluorine resin.

In addition, when the amount of the inorganic filler exceeds 20 parts by weight relative to 100 parts by weight of the fluorine-based resin, the content of the fluorine-based resin is relatively decreased, and thus the wear resistance is lowered. When the amount is less than 2 parts by weight, sufficient abrasion resistance improvement effect is achieved. It is preferable to add 2 to 20 parts by weight of the inorganic filler with respect to 100 parts by weight of the fluorine-based resin, because there is a disadvantage in that it cannot be obtained. The inorganic filler may be selected from calcium carbonate or silica.

As described above, when the friction plate is manufactured using a composition containing fluorine resin and crushed glass fiber and optionally containing molybdenum disulfide and an inorganic filler, the friction coefficient of the friction plate is 5 to 25 MPa. It is in the range of 0.07 to 0.2.

The friction plate according to the present invention having a friction coefficient within the above range can be effectively replaced because the friction coefficient is not too low, and excellent in the energy dissipation effect due to friction attenuation during the occurrence of an earthquake, in particular, the wear resistance due to the increase of the friction coefficient is remarkably inferior This can prevent the degradation of durability.

The friction plate according to the present invention can be usefully applied to the friction port bearing, the friction plate bearing containing the friction plate supports the vertical and horizontal loads in large structures such as bridges, building structures, LNG tanks, etc. Likewise, it can be usefully applied to dissipate energy by using friction attenuation generated by sliding with friction.

Hereinafter, the present invention will be described in more detail with reference to the following examples, which are presented to aid the understanding of the present invention, but the present invention is not limited thereto.

<Examples 1 to 4>

To 10 kg of PTFE, as shown in Table 1, pulverized glass fibers, molybdenum disulfide, and calcium carbonate were added and mixed sufficiently. .

Thus, the friction plate was fixed to the upper surface using the friction port support as a lower port support, and a fatigue tester (sliding tester) with a stainless plate (sliding plate) having a thickness of 3.0mm on the upper surface of the friction port support (Table 2) Friction coefficient, wear resistance and energy dissipation were measured as shown below, and the results are shown in Table 3 below.

division Crushed fiberglass Molybdenum disulfide (Kg) Calcium Carbonate (Kg) Granularity (mesh) Addition amount (Kg) Example 1 0 0 0 0 200 5 0 0 200 10 0 0 200 40 0 0 200 80 0 0 200 100 0 0 Example 2 100 40 0 0 150 40 0 0 300 40 0 0 320 40 0 0 Example 3 200 40 3 10 200 40 5 10 200 40 20 10 200 40 40 10 200 40 50 10 Example 4 200 40 20 One 200 40 20 2 200 40 20 20 200 40 20 30

Perpendicular level Load Displacement Speed Load Displacement Speed 200 tonf ± 200 mm 100 mm / sec 50 tonf ± 400 mm 300 mm / sec

-Wear resistance-

The fatigue pressure was measured at 24 MPa and the frictional speed was 8mm / sec and the displacement was ± 100mm. At this time, the wear amount of the friction plate was calculated by the difference between the initial weight of the friction plate and the weight after moving 1600m, using the wear rate was calculated.

-Coefficient of friction-

While moving the frictional speed to the maximum speed while increasing the vertical pressure of the fatigue tester to 20.7MPa and the displacement ± 20mm, measure the friction coefficient in this process, take the maximum friction coefficient value, and repeat it three times to express the average value. It was.

Energy dissipation

The equivalent damping ratio for friction was measured by moving the fatigue tester with a vertical pressure of 14.39 MPa, displacement of ± 20 mm, and a friction speed of 100 mm / sec. The larger the equivalent damping ratio, the better the energy dissipation.

division Wear resistance Coefficient of friction Equivalent Damping Ratio (%) Abrasion Amount (g) Wear rate (%) Example 1 0.24 0.042 0.0093 37.3 0.39 0.068 0.0150 41.1 1.56 0.261 0.0576 45.8 2.70 0.427 0.0943 47.4 3.59 0.541 0.1195 49.0 8.37 1.206 0.2663 55.4 Example 2 6.17 0.976 0.2155 52.6 2.86 0.452 0.0998 48.5 2.38 0.376 0.0830 46.3 2.35 0.372 0.0822 46.3 Example 3 2.68 0.416 0.0919 46.4 2.52 0.391 0.0863 46.3 2.37 0.361 0.0797 46.2 2.65 0.396 0.0875 46.3 6.73 0.968 0.2138 52.8 Example 4 2.67 0.410 0.0905 46.4 2.48 0.381 0.0841 46.3 2.55 0.384 0.0848 46.3 7.18 1.072 0.2367 53.7

As shown in Table 1, when the content of the glass fiber is added in the preferred range of the present invention in the friction plate manufactured according to the change of the crushed glass fiber content, not only the wear resistance is excellent but also the energy dissipation effect is very high. It can be confirmed that excellent, and in the second embodiment of the friction plate produced according to the particle size change of the glass fiber, it can be seen that the wear resistance is significantly reduced when the particle size is larger than the range of the present invention.

Examples 3 and 4 are examples of the manufacture of a friction plate by adding molybdenum molybdenum disulfide and calcium carbonate to improve abrasion resistance. Can be.

As described above, according to the present invention, after the crushed glass fiber is put into the fluorine resin, the friction plate of the friction plate is applied when the friction plate is prepared by using a composition containing molybdenum disulfide and an inorganic filler. Since the coefficient is not too low, the energy dissipation performance is excellent, so that it can be effectively replaced when an earthquake occurs, and in particular, a useful effect of preventing durability deterioration due to a decrease in wear resistance due to an increase in the friction coefficient can be obtained.

Claims (8)

In the manufacturing method of the friction plate support friction plate for molding a fluorine resin-based composition in a mold Friction, characterized in that the composition comprises 10 to 80 parts by weight of glass fiber pulverized to a particle size of 150 to 300 mesh with respect to 100 parts by weight of polytetrafluoroethylene while using polytetrafluoroethylene as a fluorine resin Method for manufacturing friction plate for pot bearing. delete delete The method of claim 1, wherein the composition further comprises 5 to 40 parts by weight of molybdenum disulfide. The method of claim 4, wherein the composition further comprises 2 to 20 parts by weight of an inorganic filler. The method of claim 5, wherein the inorganic filler is selected from calcium carbonate or silica. The friction plate for friction port bearings produced by the manufacturing method of claim 1, wherein the friction coefficient is in the range of 0.07 to 0.2 when the bearing pressure is 5 to 25 MPa. A friction port bearing manufactured by the manufacturing method of claim 1, comprising a friction plate having a coefficient of friction of 0.07 to 0.2 when the acupressure stress is 5 to 25 MPa.

Images