KR101708886B1 - Engineering plastic friction member, isolator and method for making the same - Google Patents

Abstract

Disclosed is a frictional member allowing reduction of the number of parts in comparison with an existing frictional member, preventing the occurrence of a stick slip, and controlling a frictional coefficient with respect to a member to be in contact therewith in accordance with a use condition to form an isolator. A method for manufacturing a frictional member comprises: a non-stick slip compression stress information obtaining step of obtaining information on non-stick slip compression stress causing no stick slip under a specific condition such as whether a lubricant exists or the like in a predetermined frictional speed range of a frictional member made of engineering plastic material with respect to a contact member; a step of forming compression stress on at least one surface, which is smaller than the compression stress of the non-stick slip, by load to be applied to the frictional member through the contact member and preparing the frictional member having a frictional contact surface having an area for stably supporting the contact member; and a contact area reducing step of reducing the surface area in contact with the contact member by forming a groove or a hole for increasing compression stress on the frictional contact surface to allow the compression stress applied to the frictional contact surface to be the non-stick slip compression stress or more under a specific condition.

Description

Technical Field [0001] The present invention relates to an engineering plastic friction member, an isolator and a method for making same,

In general, an isolation device such as a friction pendulum system (FPS) or a spherical bearing is installed between an upper structure of a bridge and a bridge to transmit a load transmitted from the upper structure to a bridge, Many structures are installed in structures such as thermal expansion and contraction allowance of structures, dynamic load support during starting or braking of trains or automobiles, and bridges requiring seismic isolation during earthquakes.

The conventional friction pendulum system or spherical bearing has a spherical block having a convex spherical surface, a lower plate having a spherical groove formed therein, and an upper plate capable of transmitting the load of the upper structure supported on the spherical block to the spherical block, . In these conventional seismic devices, the spherical block is made of metal, and the friction contact surface is formed by attaching sliding material such as PTFE.

The conventional seismic isolation device as described above is heavy in weight because the spherical block is made of metal together with other accessories, and forms a slidewindowing groove in the spherical block and attaching a sliding material such as PTFE to the mounting groove, There is a disadvantage in that it is very difficult to form a groove in the groove and securely fix the sliding member such as PTFE.

In addition, the conventional slip made of PTFE or UHMW-PE is difficult to attach to the spherical block because it is attached with the adhesive in the state of being inserted into the groove due to the cold flow phenomenon.

A plastic spherical block which solves the disadvantages of the conventional seismic equipments as described above has been developed and is referred to as Registration No. 10-1256829 entitled "Spherical bearing and plastic spherical block for this purpose", inventor: Kim Sung-gyu, hereinafter referred to as " ).

The line-registration invention solves many of the disadvantages of conventional seismic isolation devices using metal spherical members, which have many advantages such as being lightweight, not corroded, and easy to process, but there are still further issues to be improved.

The present inventor has noticed that there is a problem that a stick slip phenomenon occurs in the line registration invention.

An object of the present invention is to provide a friction member capable of preventing a stick slip phenomenon and an isolation device using the same.

Another object of the present invention is to provide a friction member capable of easily adjusting sliding characteristics of an upper surface and a lower surface, and an isolator using the friction member.

It is still another object of the present invention to provide a method of making a friction member and an isolator according to the present invention.

The engineering plastic friction member according to the present invention is characterized in that it comprises a non-stick slip which does not cause a stick slip under certain conditions of lubricant absorber and load magnitude within a predetermined friction speed range of a friction member made of a specific engineering plastic material for the contact member obtaining non-stick slip compressive stress information to obtain information on non-stick slip compressive stress; Wherein a compressive stress smaller than the non-stick slip compressive stress is generated by a load to be imposed on at least one surface of the friction member via the contact member, Preparing a friction member having a friction contact surface; And a groove or hole for increasing a compressive stress is formed on the friction contact surface so that the compressive stress applied to the friction contact surface under the specific condition becomes the non-stick slip compressive stress or more, And a contact area reducing step of reducing a contact area of the contact area.

In the contact area decreasing step, the groove for increasing the compressive stress is preferably formed to a depth of 0.5 to 10 mm.

In the contact area reducing step, the groove for increasing the compressive stress is formed in a circular shape, a ring shape, a combination of the circular shape and the ring shape, a groove in the form of a lattice, a radially arranged groove, One of the plurality of circular grooves, or a combination of two or more of the plurality of circular grooves.

The friction member may be a spherical block having at least one of an upper surface and a lower surface formed in a convex spherical shape, and the contact area reducing step may include forming a groove or hole for increasing the compressive stress along the rim of the friction member.

The friction member may be a plate member.

An engineering plastic friction member according to the present invention is a spherical block having at least one of an upper surface and a lower surface formed in a convex spherical shape,
Wherein the spherical block is made of engineering plastic and is reduced in contact area with the contact member so that the lubricant is applied by the contact member under specific conditions of the material of the engineering plastic and the magnitude of the load And a groove for increasing a compressive stress formed on a frictional contact surface with the contact member so as to have a compressive stress equal to or higher than a non-stick slip compressive stress that does not cause a stick slip to a losing load,
The depth of the groove for increasing the compressive stress is 0.5 to 10 mm,
As shown in Figs. 3 to 7, the grooves for increasing the compressive stress include a circular shape, a ring shape, a combination of the circular shape and the ring shape, a lattice shape groove, and a radial shape And is formed in any one of the arranged grooves.

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A method of manufacturing a friction member according to the present invention includes the steps of making an engineering plastic friction member by the method of the present invention; Preparing an upper plate having a friction surface having a radius of curvature corresponding to an upper surface of the engineering plastic friction member so as to make surface contact with the upper surface of the engineering plastic friction member; And preparing a lower plate having a friction surface having a curvature radius corresponding to a bottom surface of the engineering plastic friction member so as to be in surface contact with the bottom surface of the engineering plastic friction member.

The friction member may have a first convex surface convex downward and a second convex surface convex upward and having a radius of curvature larger than that of the first convex surface.

The seismic isolation device according to the present invention includes the friction member according to the present invention.

According to the present invention, it is possible to provide a spherical bearing and a friction pendulum system which can reduce the number of parts and prevent a stick slip phenomenon from occurring as compared with the conventional one.

According to the present invention, it is possible to configure the seismic isolation device by adjusting the coefficient of friction with the member to be contacted in accordance with the condition of use of the seismic isolation device.

According to the present invention, it is made into a plate and can be used for sliding materials such as conventional PTFE or UHMW-PE. In this case, it is more excellent in abrasion resistance than conventional sliding materials such as PTFE or UHMW-PE, , And adjusting the coefficient of friction according to the conditions of use.

According to the present invention, the frictional coefficient of the upper surface of the friction member and the frictional coefficient of the lower surface of the friction member can be made the same or different and easily adjusted.

1 is a graph for explaining a stick slip phenomenon,
FIG. 2 is a block diagram illustrating a method of manufacturing an engineering plastic friction member according to the present invention.
3 is an exploded perspective view showing an example of a friction pendulum system,
4 is a cross-sectional view of the Fig. 3 facing device,
Fig. 5 is an exploded perspective view showing a modification of Fig. 4,
6 is a cross-sectional view showing another example of an engineering plastic friction member according to the present invention,
FIG. 7 is a plan view of the friction member of FIG. 6;
FIG. 8 is a view showing another embodiment of the engineering plastic friction member according to the present invention, wherein (a) is a plan view, (b) is a sectional view,
Fig. 9 is a view showing still another example of the engineering plastic friction member according to the present invention. Fig. 9 (a) is a plan view, Fig. 9 (b)
10 to 14 are views showing other applications of the isolation device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a graph for explaining a stick-slip phenomenon of a friction member not forming a compression stress increasing groove.

1 shows a spherical block of an engineering plastic friction member of a friction pendulum system (FPS). The spherical block was subjected to a compressive stress of 30 MPa, a horizontal velocity of 100 mm / sec, and a horizontal displacement of +/- 150 mm Experimental graph.

As can be seen from the graph of FIG. 1, when the sliding movement between the friction member which does not have a compression stress increasing groove on the frictional contact surface of the engineering plastic friction member and the contact member which contacts the friction member repeatedly increases or decreases in accordance with the change of the load And a stick slip phenomenon that causes vibration to occur is observed.

The stick-slip phenomenon refers to a phenomenon in which a sliding motion between the friction member and the contact member contacting the friction member is not smooth and moves while causing vibration. If a stick slip phenomenon occurs, not only a severe vibration is generated in the structure but also an excessive force is applied to the friction member, the contact member, and the support structure, so that the stick slip phenomenon should not occur.

The inventors of the present invention have found from various experiments that it is practically difficult to determine a condition in which the stick slip phenomenon does not occur uniformly because stick slip phenomenon has many variables such as the presence or absence of the lubricant, the material of the engineering plastic, the sliding speed, .

However, the present inventors have found that the magnitude of the coefficient of friction on a metal surface having a smooth surface, such as a stainless steel plate or a chromium coated surface, greatly affects the stick slip phenomenon.

In addition, it was confirmed that stick slip phenomenon occurs when sliding pressure is low and sliding speed is fast when lubricant is not applied and stick slip occurs on the sliding surface, and polyamide etc. called nylon The sticky surface phenomenon is mainly caused when the compressive stress of the frictional contact surface is 30 MPa or less at a speed of 30 mm / sec or more at the smooth surface of the flat surface, although it is not accurate depending on how much or what kind of lubricant is impregnated in the engineering plastic Respectively.

Engineering plastic spherical blocks used in EP-Spherical Bearing and EP-FPS are designed with allowable compressive stresses of about 30 to 40 MPa. Here, the compressive stress of 30 to 40 MPa is calculated based on the whole circular contact area of the spherical block.

Also, in the same manner as in the experimental example of the graph 1, a groove for increasing the compressive stress is formed on the frictional contact surface of the spherical block having a relatively large frictional contact surface by increasing the size of the spherical block so that the compressive stress of the frictional contact surface is 30 MPa As a result, the stick slip phenomenon did not occur.

The present inventors manufactured various types of friction member samples having grooves for increasing the compressive stress as shown in Table 1 below and subjected to a load-displacement test at a speed of 100 mm / sec to calculate a load-displacement hysteresis curve as shown in the following graph .

Table 1

Load displacement curve

In addition, the following load displacement tests were carried out for the other samples of various nylon engineering plastics as shown below.

Load displacement history curves and their samples

In addition, the load displacement experiment was also carried out for various samples as follows.

Other samples

The stick slip phenomenon was not generated at a speed of 100 mm / sec under 35 MPa to 120 MPa compressive stress using various samples as shown above. In addition, when the R-nylon sample with grooves for increasing the compressive stress was subjected to a test at a rate of 100 mm / sec while lowering the vertical load to 5 MPa to 30 MPa, the stick slip phenomenon did not occur, The coefficient of friction can be obtained. In the various test samples, the area where the grooves for increasing the compressive stress were formed was about 10% and the largest was about 75% based on the friction contact surface before the groove formation.

The present inventor has further examined to see why the stick-slip phenomenon does not occur in the samples in which the grooves for increasing the compressive stress are formed. As a result, when the grooves for increasing the compressive stress are formed on the friction surface, It can be seen that the grooves for increasing the compressive stress are not formed on the surface of the engineering plastic on which the grooves for increasing the compressive stress are generated when the concave curved plates on the upper and lower sides and the movement error generated on the surface of the engineering plastic are generated It can easily be understood that the shape is deformed to compensate for the movement error and the like, thereby preventing the stick slip phenomenon.

More specifically, since the areas to be compressed and rubbed by the grooves for increasing the compressive stress are divided, the stick-slip phenomenon is generated as the friction areas of the respective friction areas easily slightly cause elastic and plastic compression deformation It was found that slipping smoothly without increasing the resistance acts as a major cause for preventing the stick slip phenomenon from occurring. This is true even when the friction contact surface is flat.

The area where the grooves for increasing the compressive stress are formed will vary depending on various conditions such as the compressive stress, the material of the friction member, the speed of the horizontal displacement, and the curvature of the friction surface. However, It should be at least about 10%. However, even when the grooves for increasing the compressive stress are formed at less than about 10%, the occurrence of the stick slip phenomenon can be prevented in the vicinity of the critical value. For example, when the compressive stress is 30 MPa and the critical stress causing the stick slip phenomenon at 30 mm / sec is increased, the stick slip phenomenon may not be caused by slightly increasing the compressive stress, which is a main variable of the stick slip phenomenon. Even if only the grooves for increasing the compressive stress are formed, for example, only 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2% or 1% The stick slip phenomenon may not occur. That is, in the present invention, it is difficult to collectively determine the lower limit of the area ratio at which the grooves for increasing the compressive stress are formed in reality, and it varies depending on various conditions.

Even if the groove area for compressive stress increase is more than 75%, as the ratio increases up to 120 MPa, it acts as a positive factor to reduce the stick slip phenomenon. However, since the size of the friction member increases abnormally, Falls. Taking these points into consideration, it is preferable that the area of the groove for increasing the compressive stress is practically about 65% or less.

As a result of various studies and experiments as mentioned above, the present inventors have found that the compressive stress and the friction speed are the main variables of the stick slip phenomenon in engineering plastics, and even under the same compressive stress, That is, when grooves for increasing the compressive stress are formed, more stable support is possible, and it is confirmed that the stick slip phenomenon is also distanced away.

The friction member according to the present invention can be formed by forming a groove (indicated by gray in the figure to distinguish it from the frictional contact surface, red in the same color as the material) on the upper surface of the friction member in the following manner. The width of the groove on the inner side is 10 mm, the width of the friction contact surface (red) is 12 mm, the friction contact surface is subjected to compressive stress of 100 MPa, or the width of the groove is 9.5 mm , And the width of the friction contact surface (red) is 10.5 mm, so that the friction contact surface is subjected to compressive stress of 120 MPa.

Furthermore, the friction member according to the present invention has a groove formed on the upper surface of the friction member with a width of 3.5 mm and a frictional contact surface (red) width of 1.5 mm so that the frictional contact surface has compressive stress of 100 MPa Or the width of the groove is 17 mm and the width of the friction contact surface (red) is 8 mm so that the friction contact surface is subjected to compressive stress of 100 MPa.

The above-mentioned friction member can also form a groove for increasing the compressive stress in the bottom surface.

The inventors of the present invention have conducted experiments on the friction coefficient of the frictional contact surface of a nylon friction member against a smooth chromium plated layer as a result of which the friction coefficient is gradually decreased In particular, the friction coefficient decreased sharply from about 5 MPa to 30 MPa, and then the frictional coefficient gradually decreased as the compressive stress increased to 80 MPa, and the decrease rate of the frictional coefficient decreased significantly after 80 MPa .

The inventors of the present invention have found from the above test results that if a groove or a hole is formed on the surface of a friction member having a smooth friction contact surface to increase the compressive stress to have compressive stress equal to or higher than the stick- And the contact surface to be supported in a contact state can be widely distributed, so that the upper structure with a large load can be supported more stably. Stable support is very important when an upper structure causes large displacement due to an earthquake.

3 is a perspective view showing an example of a friction pendulum system according to the present invention, and Fig. 4 is an exploded perspective view of the friction pendulum system according to the present invention. Sectional view of the isolation device.

Referring to Figs. 2 to 4, a process of making the engineering plastic friction member and the seismic isolation device according to the present invention will be described.

First, information on the non-stick slip compressive stress of the friction contact surface that does not cause stick slip under a specific condition of a friction member made of an engineering plastic material such as nylon for a contact member contacting a friction member such as a stainless steel plate is obtained (S1).

Here, the specific condition is determined according to the place where the isolation device 100 is installed, and it is determined by the design speed at the time of designing, such as the sliding speed in the frictional contact state to be reflected in design, the load to be imposed by the seismic isolation device, All.

Information on the I-stick slip compressive stress can be obtained through experiments under the specific conditions. If there is existing information or experimental data on the unsteady slip compressive stress under specific conditions, use existing information or experimental data.

Next, a frictional contact surface (not shown) is formed on the frictional member 110 so as to stably support the structure supporting the frictional member 110 through the upper plate 120, forming a compressive stress smaller than the hard-slip compressive stress due to the load to be borne by the frictional member 110 111) is prepared (S2). The friction member 110 is made of an engineering plastic such as nylon.

Engineering plastics include those made of polyamide (PA), also referred to as nylon, those made of polyacetal or polyoxymethylene (POM), those made of polyethylene terephthalate (PET) (PSU), polyether sulfone (PES), polyphenylene sulphide (PPS), polyphenylene sulfone (PPSU), polyphenylene sulfone Polyetherimide (PEI), polyamide imide (PAI), polybenzimidazole (PBI), polyimide (PI) and polyether ether (Hereinafter referred to as "engineering plastics such as nylon") can be used.

Of the above engineering plastics, suitable for forming a plastic spherical block is that the friction surface is made of an engineering plastic having a hardness of 75D to 95D and has a density of 1.14 - 1.15 g / cm 3 and a compression strength of about 950 - 1,100 kg / desirable. The dynamic friction coefficient of the plastic spherical block to stainless steel is 0.08-0.15 when the load is 18 MPa, and 0.08-0.15 when the load is 18 MPa for the friction member and the isolator according to the present invention, 0.04 - 0.10 for a load of 35 MPa and 0.03 - 0.08 for a load of 69 MPa.

Then, a compressive stress increasing groove 112 or a hole is formed in the frictional contact surface 111 so that the compressive stress applied to the frictional contact surface 111 by the load to which the frictional member 110 is to bear is applied to the non- So as to be at least compressive stress (S3). In this embodiment, the groove 112 for increasing the compressive stress is formed as a circular groove at the center of the friction member 110. The grooves 112 for increasing the compressive stress are indicated by gray or black for distinguishing from the friction contact surface 111, but are red, such as the friction contact surface 111 having the color of the engineering plastic raw material. This is the same in Fig. 5 which will be described later.

An upper plate 120 having a friction surface corresponding to the upper surface of the friction member 110 and a lower plate 130 having a friction surface corresponding to the lower surface of the friction member 110 are prepared (S4).

The upper plate 120 and the lower plate 130 can be made together before or after the friction member 110 is made or when the friction member 110 is made. A stainless steel plate may be provided on the bottom surface of the upper plate 120 and an upper surface of the lower plate 130 may be chrome plated to smooth the contact surface.

4, the friction stir piece 100 having the friction member 110 according to the present invention can be manufactured by coupling the friction member 110 formed as described above between the upper plate 120 and the lower plate 130 as shown in FIG. (S5).

The lower plate 130 and the upper plate 120 of the isolation device 100 as shown in FIGS. 3 and 4 can be fixed to the upper surface of the lower structure and the lower surface of the upper structure through welding.

5 is an exploded perspective view showing a modification of Fig.

When the lower structure is made of concrete or the like, the anchor nut AN is planted in the lower structure and the bolts B are coupled through the holes 134 of the flange 133 provided on the lower plate 130 to fix the lower plate 130 can do.

In this embodiment, the groove 112 for increasing the compressive stress formed on the friction contact surface 111 of the friction member 110 is provided with a central circular groove centered on the center of the friction member 110, Shaped annular grooves.

For reference, the restoring stiffness K along the spherical surface in such a friction pendulum system is obtained by the following equation.

이고, 마찰력

이다.

, Frictional force

to be.

는 상부강성 반력,

은 하부강성 반력, dt는 상부곡률 변위, dl은 하부곡률 변위이다.Here, DL is the upper self weight, mu is the friction coefficient, R1 is the upper curvature, R2 is the lower curvature,

The upper stiffness reaction force,

Dt is the upper curvature displacement, and dl is the lower curvature displacement.

The rest is the same as described with reference to Figs. 3 and 4.

FIG. 6 is a cross-sectional view showing another example of the engineering plastic friction member according to the present invention, and FIG. 7 is a plan view of the friction member of FIG.

The annular compressive stress increasing groove 112a is formed at the edge of the friction contact surface 111 of the engineering plastic friction member 110 formed with a convex spherical surface in a downward direction and a convex spherical surface in an upper surface, An annular compressive stress increasing groove 112b having a narrow width is formed on the inside thereof and a circular compressive stress increasing groove 112c is formed in the center thereof to constitute an engineering plastic friction member according to the present invention . The compressive stress increasing grooves 112a, 112b, and 112c may be formed in the same or similar pattern on the bottom surface as well as on the top surface.

The annular compressive stress increasing grooves 112a of the outer periphery are designed so as to be frictional in contact with the inside of the annular compressive stress increasing grooves 112a so as not to be brought into frictional contact with each other, Can be prevented.

The depths of the compressive stress increasing grooves 112a, 112b and 112c are preferably between about 0.5 mm and 10 mm, more preferably about 1 to 2 mm. Engineering plastics such as nylon are not required to form deeply the grooves 112a, 112b and 112c for increasing the compressive stress because of their high hardness and strong resistance to abrasion. Reducing the depth of the compressive stress increasing grooves 112a, 112b, 112c is preferably able to withstand vertical loads in the entire area (including the area under the groove) below a certain thickness of the spherical block of engineering plastic And the grooves 112a, 112b and 112c for compressive stress increase are structurally stable. However, since the frictional contact surface having the frictional contact with the frictional contact surface is reduced in contact area as much as the grooves 112a, 112b and 112c for increasing the compressive stress are formed, the compressive stress of the frictional contact surface actually applied can be increased.

The width of the compression stress increasing grooves 112a, 112b, 112c may be adjusted according to the compressive stress of the surface to be designed. The compressive stress increasing grooves 112a, 112b, and 112c may be increased in width to increase the number of circular or lattice compressive stress increasing grooves 112a, 112b, and 112c, Only one can be done.

In this case, it is preferable that the friction material 110 such as an engineering plastic spherical block is designed such that the grooves 112a, 112b and 112c for increasing the compressive stress of the outer frame are wide and large so as not to come into frictional contact, Can be structurally further stabilized.

When the depth of the compressive stress increasing grooves 112a, 112b and 112c formed on the friction contact surface 111 is made very small, the compressive stress of the friction contact surface 111 can be made very high. However, The overall sectional area of the friction member 110 such as a spherical block can have a great advantage that the stabilization of the friction member 110 having a spherical block structure can be achieved with a structure (about 30 to 40 MPa) capable of supporting a vertical load.

Such an advantage can be achieved because the engineering plastic material itself such as nylon is much stronger than other friction materials conventionally used. However, when a sliding material such as PTFE or UHMW-PE generally used has a large compressive stress on the frictional contact surface, This phenomenon can not be taken advantage of because cold flow phenomenon occurs.

By forming the grooves 112a, 112b and 112c for increasing the compressive stress with a very small depth on the friction contact surface 111 as described above, the surface compressive stress can be increased and the corresponding friction coefficient can be ensured. The compressive stress of the friction contact surface 111 may be varied by forming the grooves 112a, 112b and 112c for increasing the compressive stress on the friction contact surface 111 depending on the type and% of the lubricant impregnated in the engineering plastic, Can be adjusted between about 0.03 and 0.1.

Needless to say, in order to obtain a smaller coefficient of friction, another lubricant may be applied to the surface on which the grooves for increasing the compressive stress 112a, 112b, and 112c are formed.

In this case, the surface of the friction member 110 made of an engineering plastic such as nylon, which constitutes a spherical block of a spherical bearing or a spherical block of a friction pendulum system or the like, serves as a sliding material without using any additional sliding material , It is possible to stably support the structure with a sufficient size and reduce the area of the friction contact surface 111 to increase the compressive stress and to reduce the coefficient of friction on the smooth metal surface such as the stainless steel plate and the chromium plating layer, Can be prevented.

The description of the grooves 112a, 112b and 112c for increasing the compressive stress in the above-described embodiment can be applied to the grooves for increasing the compressive stress as described above.

8 is a view showing another embodiment of the engineering plastic friction member according to the present invention, wherein (a) is a plan view and (b) is a sectional view.

The friction material 110 according to the present invention can be formed by forming annular compressive stress increasing grooves 112 having the same center at intervals in the plate-like friction material 110 at intervals. The friction member 110 as shown in Fig. 8 may be used by forming a mounting groove having the same shape in the member to be mounted, and inserting it into the mounting groove. That is, the friction member 110 as shown in FIG. 8 can be used as a separate friction material sheet. In this case, the groove 112 for increasing the compressive stress can be formed to have a very small depth, thereby making it possible to prevent the stick slip from occurring while increasing the surface compressive stress. There is no cold flow and the steel backing plate. However, it is needless to say that bonding is not required, but it can be used by bonding. In this case, a low coefficient of friction can be secured without applying a separate lubricant.

In the case of the friction member 110 for use as a separate friction material sheet, instead of the grooves 112 for increasing the compressive stress, several small circular holes can be drilled to increase the compressive stress, May be mixed and formed. This is also true in the embodiment shown in Fig. 9 below.

When the friction member 110 is made of an engineering plastic such as nylon as in the present invention, surface processing is very easy, and any form of machining can be performed. The machining cost is very low as compared with a material such as iron, , It is very resistant to wear without maintenance, and can be used semi-permanently. And there is no cold flow phenomenon as compared with PTFE and UPE which are widely used.

When the friction material 110 according to the present invention is used in place of the conventional PTFE, UHMW-PE or other friction material, it can provide improved performance over the existing friction material, has a long life, Can be easily adjusted and used. This is the same in the embodiment of Fig. 9 described below.

Fig. 9 is a view showing still another example of the engineering plastic friction member according to the present invention, wherein Fig. 9 (a) is a plan view and Fig. 9 (b) is a sectional view.

The grooves 112 for increasing the compressive stress may be formed in a lattice shape on one frictional contact surface 111 of the plate-like friction member 110. [ It is easier to work with a lattice shape.

Sometimes, the grooves 112 for increasing the compressive stress can be formed in a circular shape, or in other forms. A lattice-shaped compressive stress increasing groove 112 as shown in Fig. 9 (a) may also be formed in the friction member 110 having a spherical surface.

The rest is the same as described above.

Further, it is needless to say that the groove 112 for increasing the compressive stress may be formed by forming a circular groove at the center and forming a straight groove radially outside the groove.

10 to 14 are views showing other applications of the isolation device according to the present invention.

10, the frictional contact surface 111 of the bottom surface of the friction member 110 is formed as a spherical surface, and the frictional contact surface 111 of the top surface is formed in a plane, and the frictional contact surface 111 may be formed at the center thereof to form a circular compressive stress increasing groove 112 to constitute the isolation device 100 according to the present invention. At times, the grooves 112 for increasing the compressive stress can be filled with graphite, grease or lubricant for plastic. At this time, the bottom surface of the upper plate 120 should be formed as a flat surface, and it is preferable to attach a sliding material 122 made of a stainless steel plate. A chromium plating layer may be formed on the concave spherical surface 132 of the lower plate 130 to smooth the surface.

11, the frictional contact surface 111 of the bottom surface of the friction member 110 is formed as a spherical surface and the frictional contact surface 111 of the upper surface is formed as a plane, A circular compressive stress increasing groove 112c is formed at the center of the bottom surface friction contact surface 111 and annular compressive stress increasing grooves 112b are formed at intervals apart from each other have. The isolation device 100 according to the present invention for use in one movable end is provided with protrusions 125 protruding downward along both side edges of the upper plate 120 and opposite side surfaces of the lower plate 130, . To do this, both sides of the lower plate 130 facing the protrusions 125 and the protrusions 125 are formed in a straight line. The protrusions 125 are spaced apart from both sides of the lower plate 130 to allow the upper plate 120 to rotate.

The remaining items are the same as those described with reference to FIG. 10

12, annular compressive stress increasing grooves 112b are provided at intervals on the frictional contact surface 111 on the flat surface on the upper surface side, and also annular compressive stress increasing grooves 112b are formed along the edge of the friction member 110, It is possible to prevent the edge of the friction member 110 from being broken. The lattice type compressive stress increasing grooves 112 described above may be formed on the frictional contact surface 111 on the upper surface side.

A hook 136 protruding outward from the edge of the lower plate 130 is formed to provide a negative reaction force resistance function and a jaw 136 which can be hooked on the edge of the upper plate 120 through bolts or welding, And a jaw member 126 having a side surface 126a may be provided to constitute the base isolation device 100 having a negative-reaction-resistance function.

The remainder is the same as that described in Fig.

In some cases, as shown in Fig. 13, one annular compressive stress increasing groove 112 is formed on the upper surface of the friction member 110 forming a plane, and the lower surface of the upper plate 120 is extended downward And a resilient mechanism 140 is provided between the lower plate 130 and the protrusion 125 so as to constitute the isolation device 100 according to the present invention. can do.

The elastic mechanism 140 includes an elastic body 144 coupled to a part of the outer circumferential surface of the shaft 142 and an end of the shaft 142 to prevent detachment of the elastic body 144, It is preferable to have the contact end 146 contacting the side surface.

Optionally, the resilient mechanism 140 may be configured to be mounted to the protrusion 125 and the contact end 146 to be in surface contact with the side surface of the lower plate 130. The elastic mechanism 140 may be installed only in the left or right or front and rear, or in all four directions.

14, a friction member mounting groove 115 is formed on the top face of a hexahedral bearing block 110a and a groove 112 for increasing compressive stress is formed on the upper surface of the friction member mounting groove 115 The friction material 110 of the present invention can be mounted on the plate-like friction material 110 to form the isolation device 100 according to the present invention.

At this time, the friction member mounting groove 115 is formed as a spherical surface, and the bottom surface of the friction member 110 is formed into a spherical surface, thereby allowing the rotation of the upper structure to be received more.

The shaft block 142 of the elastic block 140 is inserted into the side surface of the bearing block 110a to form a shaft hole 117 which can move in the horizontal direction and an elastic pad 150 And a front end pin P passing through the elastic pad 150 are used.

The upper plate 120 is provided with a projection 125 extending downward along the edge and a pin hole 137 into which the lower end of the shearing pin P is inserted is formed at the center of the lower plate 130, ) In the horizontal direction. A sliding member such as a stainless steel plate may be disposed on the bottom surface of the upper plate 120.

The rest is the same as described with reference to FIG.

In the embodiment described with reference to Figs. 10 to 14, the grooves for increasing the compressive stress may be formed in a lattice shape, a radially arranged groove, a shape in which a plurality of small circular grooves are uniformly distributed, or the like.

The rest is the same as described above.

The present invention can be applied to a spherical bearing of a seismic device subjected to a large load, a bearing block having a spherical surface of a friction pendulum system, can be formed in a thin plate shape and can be used in place of a plate slip material made of PTFE or UHMW-PE .

100: Isolation device 110: Friction member
111: Friction contact surface
112, 112a, 112b, 112c: a groove for increasing the compressive stress
120: top plate 130: bottom plate

Claims (13)

In non-stick slip compressive stresses that do not cause stick slip under certain conditions of the lubricant radial and load magnitudes over a given friction speed range of the friction member made of a particular engineering plastic material for the contact member A non-stick slip compressive stress information obtaining step of obtaining information on a non-stick slip;
Wherein a compressive stress smaller than the non-stick slip compressive stress is generated by a load to be imposed on at least one surface of the friction member via the contact member, Preparing a friction member having a friction contact surface; And
Wherein a groove or hole for increasing compressive stress is formed on the friction contact surface so that the compressive stress applied to the friction contact surface under the specific condition becomes equal to or higher than the non-stick slip compressive stress, And a contact area reducing step of reducing the contact area. 2. The method of manufacturing an engineering plastic friction member according to claim 1, wherein the groove for increasing the compressive stress is formed to a depth of 0.5 to 10 mm. The method according to claim 1 or 2, wherein in the contact area reducing step, the groove for increasing the compressive stress is formed in a circular shape, a ring shape centered on the center of the friction member, a combination of the circular shape and the ring shape, And a plurality of circular grooves arranged in the circumferential direction and arranged in the circumferential direction and arranged in the circumferential direction, or a combination of two or more of them. The friction member according to claim 1 or 2, wherein the friction member is a spherical block having at least one of an upper surface and a lower surface formed in a convex spherical shape,
And the step of reducing the contact area includes forming the groove or hole for increasing the compressive stress along the rim of the friction member. The method of manufacturing an engineering plastic friction member according to claim 1 or 2, wherein the friction member is a plate member. Wherein at least one of the upper surface and the lower surface is a spherical block having a convex spherical surface,
Wherein the spherical block is made of engineering plastic and is reduced in contact area with the contact member so that the lubricant is applied by the contact member under specific conditions of the material of the engineering plastic and the magnitude of the load A friction material having a groove for increasing compressive stress formed on a friction contact surface with the contact member so as to have a compressive stress equal to or higher than an unstable slip compression stress not causing a stick slip against a low load,
The depth of the groove for increasing the compressive stress is 0.5 to 10 mm,
Wherein the groove for increasing the compressive stress is formed in a circular shape, a ring shape, a combination of the circular shape and the ring shape, a groove in a lattice shape, and a groove in a radially arranged shape Wherein the frictional member is made of a plastic material. delete delete delete delete A process for making an engineering plastic friction member by the method of claim 1 or 2;
Preparing an upper plate having a friction surface having a radius of curvature corresponding to an upper surface of the engineering plastic friction member so as to make surface contact with the upper surface of the engineering plastic friction member; And
And preparing a lower plate having a friction surface having a radius of curvature corresponding to a bottom surface of the engineering plastic friction member so as to be in surface contact with the bottom surface of the engineering plastic friction member. 12. The method of claim 11,
Wherein the friction member has a first convex surface convex downward and a second convex surface convex upward and having a radius of curvature larger than the first convex surface. An isometric device having the friction member of claim 6.

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