Metal rubber sector, spherical bearing shock absorber and preparation method thereof

Abstract

The present invention provides a metal rubber sector, a spherical plain bearing shock absorber and a preparation method thereof, relating to the technical field of metal rubber. The thickness H of the metal rubber sector and n satisfy the following formulas (1) and (2): r1×(1 - cos(360° / 2n)) ≤ γ×H (1); H = r1 - r2 (2); where γ = 1 / 4; H is the thickness of the metal rubber sector in mm; r1 is the outer diameter of the metal rubber sector in mm; r2 is the inner diameter of the metal rubber sector in mm. Through reasonable design, the metal rubber ring is designed into several equal parts, and by heat-treating the metal wire and performing secondary forming on the blank made of the metal wire with two different molds, a metal rubber sector with high load-bearing capacity and anti-fatigue characteristics is obtained, and at the same time, the situation of surface flying wires prone to occur when forming high-density sectors is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of metal rubber, and in particular to a metal rubber sector, a spherical bearing shock absorber and a preparation method thereof. Background Art

[0002] Spherical plain bearings are a type of spherical sliding bearings, commonly used in engineering machinery, automation equipment, and vehicle systems. Since spherical plain bearings are rigid, under external vibration or impact, the spherical plain bearings will transmit the impact to other parts of the system within the torsion angle allowed, resulting in adverse effects on the normal use of other parts and components in the system.

[0003] Metal rubber is a uniform porous material, which is made of spiral metal filaments and has a loose metal structure. The metal wires inside the metal rubber material are interlocked and interlocked, presenting a spatial mesh structure. When it is stimulated by external vibration, it dissipates energy through the dry friction generated by the sliding between the metal wires inside, thereby playing a damping role. Therefore, if the metal rubber design is equipped in the joint bearing, it can effectively reduce the adverse effects of vibration transmission between the bearings.

[0004] In the face of high-load working conditions, high-density metal rubber parts are usually designed to serve in working conditions that require high loads. At the same time, for common annular metal rubber parts, radial molding is often used to achieve high rigidity of metal rubber. However, in the actual production process, if radial molding is selected for high-density metal rubber parts, wire breakage is very likely to occur on the surface of the metal rubber parts after molding, and the density of each part of the metal rubber parts is extremely uneven. These phenomena will reduce the load-bearing capacity of the metal rubber and accelerate the failure of the metal rubber. Summary of the invention

[0005] The object of the present invention is to provide a metal rubber sector, a spherical bearing shock absorber and a preparation method thereof. The present invention designs the metal rubber ring into several equal parts through reasonable design, thereby reducing the problem of surface flying wires that are easy to appear when forming high-density sector parts. In addition, the present invention heat treats the metal wire when preparing the sector part, thereby not only eliminating the dislocation entanglement caused by large deformation in part of the drawing process and improving the elongation of the metal wire, but also indirectly improving the fatigue resistance of the metal rubber; the present invention further uses two different molds to perform secondary molding on the blank made of the metal wire, thereby improving the overall density uniformity of the sector part and obtaining a metal rubber sector part with high load-bearing capacity and fatigue resistance; in addition, the metal rubber and the spherical bearing are combined into one, which can effectively solve the problem of high vibration transmission rate caused by the rigid body of ordinary bearings.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a metal rubber sector, wherein n metal rubber sector of the same size are assembled into a metal rubber ring;

[0008] The thickness and n of the metal rubber sector satisfy the following formulas (1) and (2):

[0009] r1×(1-cos(360° / 2n))≤γ×H(1);

[0010] H = r1-r2(2);

[0011] Among them, γ=1 / 4;

[0012] H is the thickness of the metal rubber sector, in mm;

[0013] r1 is the outer diameter of the metal rubber sector, in mm;

[0014] r2 is the inner diameter of the metal rubber sector, in mm.

[0015] Further, based on the above technical solution, the central angle of the metal rubber sector satisfies the following formula (3):

[0016] θ = 360° / n (3);

[0017] Wherein, θ is the central angle of the metal rubber sector;

[0018] The range of the central angle is 0<θ≤40.8°.

[0019] The present invention also provides a metal rubber ring, which is composed of n metal rubber sector pieces of the same size as described above;

[0020] The thickness, outer diameter and inner diameter of the metal rubber ring are all equal to those of the metal rubber sector as claimed in any one of claims 1 to 3.

[0021] The present invention also provides a method for preparing the metal rubber sector as described above, comprising the following steps:

[0022] S1: According to formulas (1)-(2) as claimed in claim 1, the required metal rubber ring is designed to be divided into n equal parts of metal rubber sector-shaped parts; and the mass of metal wire required for each metal rubber sector-shaped part is calculated according to the density of the designed metal rubber sector-shaped parts;

[0023] S2: heat-treating the corresponding mass of the metal wire, and immediately taking it out for air cooling after the heat treatment;

[0024] S3: Winding the heat-treated metal wire into a metal wire spiral coil;

[0025] S4: spirally winding the metal wire to obtain a blank;

[0026] S5: Based on the number n of the metal rubber sector pieces, respectively stamping the n blanks to obtain n rectangular blanks;

[0027] S6: stamping and shaping the n rectangular blanks to obtain n metal rubber sector parts.

[0028] Further, on the basis of the above technical solution, in step S1, the metal wire includes one of SWPB metal wire, EN10270-1 DM metal wire and Roslau metal wire;

[0029] And / or, the diameter of the metal wire is 0.15-0.3 mm;

[0030] And / or, in step S1, the heat treatment temperature is 400°C to 420°C; the heat preservation time is 8 to 15 minutes;

[0031] And / or, the tensile strength of the heat-treated metal wire is: 1900MPa-2200MPa, and the elongation is: 4%-5%;

[0032] And / or, in step S3, the pitch of the metal wire spiral coil is 2.5-3.5 mm.

[0033] Further, based on the above technical solution, in step S5, the length of the rectangular blank is L, the width is W, and the width W of the rectangular blank satisfies the following formula (4):

[0034] W=π×(r1+r2) / n(4).

[0035] Further, based on the above technical solution, during the stamping process, the outer chord α1 of the metal rubber sector satisfies the following formula (5):

[0036] α1=2π×r1 / n(5)

[0037] The inner chord α2 of the metal rubber sector satisfies the following formula (6):

[0038] α2=2π×r2 / n(6)

[0039] Further, based on the above technical solution, the mass of the metal rubber or each blank in the metal rubber sector satisfies the following formula (7):

[0040] m=ρ×V=ρ×π×(r1 2 -r2 2 )×L / n(7)

[0041] Where ρ is the density of the metal rubber sector, ρ is 3.5-5.5 g / cm 3 ;

[0042] L is the length of the rectangular blank or the length of the metal rubber ring or the length of the metal rubber sector, and L is 25-35 mm.

[0043] The present invention also provides a spherical bearing vibration damper with high load-bearing and fatigue-resistant characteristics, comprising a spherical bearing outer ring unit, the metal rubber ring as described above, a spherical bearing inner ring unit and a spherical bearing sleeve;

[0044] The inner surface of the spherical bearing outer ring unit is tangent to the outer surface of the spherical bearing inner ring unit, and a metal rubber ring is provided between the inner surface of the spherical bearing inner ring unit and the groove of the spherical bearing sleeve, and the metal rubber ring is composed of n metal rubber fan-shaped parts as described above or metal rubber fan-shaped parts prepared by the preparation method of the metal rubber fan-shaped parts as described above.

[0045] The present invention provides a metal rubber sector, a spherical bearing shock absorber and a preparation method thereof, and the beneficial effects are as follows:

[0046] 1. The present invention improves the fatigue performance of the metal rubber sector obtained by winding the metal wire by heat treating the metal wire.

[0047] 2. The present invention divides the metal rubber ring into several equal parts (the design of the central angle with respect to the thickness) through reasonable design, thereby reducing the occurrence of surface flying wires when forming high-density fan-shaped parts.

[0048] 3. In the preparation process of the metal rubber fan-shaped parts of the present invention, two different molds are used for secondary molding, which not only obtains metal rubber fan-shaped parts with high load-bearing capacity and anti-fatigue properties, but also further avoids the situation of surface flying wires that are prone to occur when molding high-density fan-shaped parts.

[0049] 4. The metal rubber ring of the present invention is integrated with the spherical bearing to effectively solve the problem of high vibration transmission rate caused by the rigid body of the ordinary bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 It is a front view of the stamping and shaping die in Example 1 of the present invention;

[0052] Figure 2 It is a side view of the stamping and shaping die in Example 1 of the present invention;

[0053] Figure 3 A schematic diagram of the structure of the spherical bearing shock absorber provided by the present invention;

[0054] Figure 4 A top view of the metal rubber sector prepared in Example 1 of the present invention;

[0055] Figure 5 It is a front view of the metal rubber sector prepared in Example 1 of the present invention;

[0056] Figure 6 This is a physical picture of the spherical bearing shock absorber assembled in Example 1 of the present invention;

[0057] Figure 7 This is a physical picture of the metal rubber sector prepared in Comparative Example 3;

[0058] Figure 8 This is a physical picture of the metal rubber sector prepared in Comparative Example 4;

[0059] Fig. 9 This is a diagram showing the fatigue test results of the metal rubber sector produced in Example 1;

[0060] Fig.10 This is a diagram showing the fatigue test results of the metal rubber sector prepared in Comparative Example 1;

[0061] Fig.11 This is a diagram showing the fatigue test results of the metal rubber sector prepared in Comparative Example 2;

[0062] Fig.12 It is the front view of the rectangular blank;

[0063] Fig.13 is a top view of a rectangular blank, wherein the width W forms an arc of the metal rubber sector after being deformed by stamping, and the length L corresponds to the length L of the metal rubber sector;

[0064] Fig.14 It is a front view of the metal rubber sector;

[0065] Fig.15 It is a top view of the metal rubber sector;

[0066] icon:

[0067] 1. Spherical plain bearing outer ring unit 1; 2. Metal rubber fan-shaped part; 3. Spherical plain bearing sleeve; 4. Spherical plain bearing inner ring unit. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. The process parameters of the following embodiments that do not specify specific conditions are usually based on conventional conditions.

[0069] The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in the present invention.

[0070] A first aspect of the present invention provides a metal rubber sector, wherein n metal rubber sector of the same size are assembled into a metal rubber ring;

[0071] The thickness and n of the metal rubber sector satisfy the following formulas (1) and (2):

[0072] r1×(1-cos(360° / 2n))≤γ×H(1);

[0073] H = r1-r2(2);

[0074] Among them, γ=1 / 4;

[0075] H is the thickness of the metal rubber sector, in mm;

[0076] r1 is the outer diameter of the metal rubber sector, in mm, i.e., the distance from the center of the metal rubber sector to the outer circumference of the metal rubber sector;

[0077] r2 is the inner diameter of the metal rubber sector, in mm, that is, the distance from the center of the metal rubber sector to the inner circumference of the metal rubber sector.

[0078] Specifically, the γ=1 / 4 defined in the present invention is an empirical value. The range of values ​​of the number n of suitable metal rubber fan-shaped parts is calculated by formulas (1) and (2). As long as the value of n is greater than or equal to the calculated value, the problem of flying wires on the surface of the high-density metal rubber fan-shaped parts can be avoided. Generally, in the actual process, the value of n must also consider the complexity of the process and the cost. If the value of n is too large, the increase in the number of metal rubber fan-shaped parts will not only increase the manufacturing cost, but also bring greater challenges to the mold design and installation. Each fan-shaped part needs to be accurately matched with the mold to ensure that it can be correctly molded, which is difficult to operate. Therefore, n is preferably an integer closest to the lower limit, such as n≥8.82. In actual operation, n is preferably 9. Furthermore, according to the calculated value of n, an ideal molding mold can be obtained by precise calculation. Combined with the precise control of the technical parameters of the molding process, it can effectively ensure that the obtained metal rubber fan-shaped parts exhibit excellent fatigue performance during use, thereby extending their service life and improving the reliability of the overall structure.

[0079] As an optional embodiment of the present invention, r2 is 10-20 mm (such as 12 mm, 14 mm, 16 mm, 18 mm, etc.); r1 is 20-30 mm (such as 22 mm, 24 mm, 26 mm, 28 mm, etc.);

[0080] H=r1-r2≥5mm.

[0081] Specifically, according to the requirements in the actual production process, the inner diameter and outer diameter of the required metal rubber ring are measured to obtain the specific values ​​of the outer diameter r1 and the inner diameter r2 of the metal rubber sector. Further, the specific value of the thickness H of the metal rubber sector can be calculated according to formula (2). Further, the number n of the metal rubber sector can be calculated according to formula (1).

[0082] As an optional implementation of the present invention, the central angle of the metal rubber sector satisfies the following formula (3):

[0083] θ = 360° / n (3);

[0084] Wherein, θ is the central angle of the metal rubber sector.

[0085] As an optional implementation manner of the present invention, the range of the central angle is 0<θ≤40.8° (for example, 10°, 20°, 30°, 32°, 34°, 36°, 38°, 40°, etc.).

[0086] The second aspect of the present invention provides a metal rubber ring composed of n metal rubber sector pieces of the same size as described in the first aspect;

[0087] The thickness, outer diameter and inner diameter of the metal rubber ring are all equal to those of the metal rubber sector described in the first aspect above.

[0088] It can also be said that H is the thickness of the metal rubber ring, r1 is the outer diameter of the metal rubber ring, and r2 is the inner diameter of the metal rubber ring.

[0089] Specifically, the inner diameter r2 and the outer diameter r1 of the metal rubber ring of the present invention are determined by the environment in which the metal rubber ring is used, that is, by the outer ring located outside and adjacent to the metal rubber ring and the inner ring located inside and adjacent to the metal rubber ring. Figure 3 In the joint bearing damper shown in the figure, the inner diameter of the metal rubber ring is determined by the outer diameter of the joint bearing sleeve 3 and the outer diameter of the metal rubber ring is determined by the inner diameter of the joint bearing inner ring unit 4. In other words, the inner diameter r2 and outer diameter r1 of the metal rubber ring can be preset according to the use environment.

[0090] A third aspect of the present invention provides a method for preparing the metal rubber sector as described above, comprising the following steps:

[0091] S1: According to formulas (1)-(2) as claimed in claim 1, the required metal rubber ring is designed to be divided into n equal parts of metal rubber sector-shaped parts; and the mass of metal wire required for each metal rubber sector-shaped part is calculated according to the density of the designed metal rubber sector-shaped parts;

[0092] S2: placing the corresponding mass of metal wire in a muffle furnace for heat treatment, and immediately taking it out for air cooling after the heat treatment;

[0093] S3: Winding the heat-treated metal wire into a metal wire spiral coil;

[0094] S4: spirally winding the metal wire to obtain a blank;

[0095] S5: Based on the number n of the metal rubber sector pieces, respectively stamping the n blanks to obtain n rectangular blanks;

[0096] S6: stamping and shaping the n rectangular blanks to obtain n metal rubber sector parts.

[0097] As an optional embodiment of the present invention, in step S1, the metal wire includes one of SWPB metal wire, EN10270-1 DM metal wire and Roslau metal wire;

[0098] The diameter of the metal wire is 0.15-0.3 mm (such as 0.18 mm, 0.20 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, etc.).

[0099] As an optional embodiment of the present invention, in step S1, the heat treatment temperature is 400°C to 420°C (for example, 402°C, 404°C, 406°C, 408°C, 410°C, 412°C, 414°C, 416°C, 418°C, etc.), preferably 410°C; the insulation time is 8 to 15 minutes (for example, 10 minutes, 12 minutes, 14 minutes, etc.), preferably 10 minutes.

[0100] Specifically, the heat treatment refers to stress relief annealing, the purpose of which is to increase the elongation of the metal wire by sacrificing a portion of the strength of the high-strength steel wire; the present invention performs stress relief annealing at a temperature of 400°C to 420°C, so that the metal wire recovers at a lower temperature, the dislocation entanglement in the structure is reduced, and part of the stress in the cold drawing process is released, thereby increasing the elongation of the metal wire;

[0101] Furthermore, under cyclic strain (bending, twisting, sliding, etc. occur between the internal metal wires under metal rubber working conditions), the increase in the elongation of the metal wire helps to disperse the stress at the crack tip, thereby slowing down the expansion of the crack. At the same time, it can also bring better energy absorption capacity and better adapt to the changes in complex stress, so that the metal wire can better maintain the ideal micro-motion contact conditions, thereby improving the fatigue resistance of the metal rubber.

[0102] If the heat treatment temperature is higher than 420℃, the recovery of the metal wire will be more obvious, and the strength and surface hardness of the metal wire will be reduced, which will accelerate the friction and wear between the metal wires and cause the metal rubber to fail quickly. In the compression test of the metal rubber, the macroscopic performance is that its (metal rubber) stiffness drops significantly and the metal wire breaks.

[0103] If the heat treatment temperature is less than 400°C, the recovery degree of the metal wire will be low, and the stress concentrated in the metal wire during the drawing process cannot be released, and a high elongation metal wire (with relatively high fatigue resistance) cannot be obtained.

[0104] As an optional embodiment of the present invention, the tensile strength of the metal wire after heat treatment is: 1900MPa-2200MPa, and the elongation is: 4%-5%.

[0105] As an optional embodiment of the present invention, in step S3, the heat-treated metal wire is wound to form a metal wire spiral coil, and stretched to a certain pitch, and the pitch of the metal wire spiral coil is 2.5-3.5 mm (such as 2.7 mm, 2.9 mm, 3.0 mm, 3.2 mm, etc.).

[0106] As an optional embodiment of the present invention, in step S4, the metal wire is spirally wound to obtain a blank, and the winding can be performed by a conventional method in the art. However, in order to ensure that the hooking / engaging conditions between the metal wires inside the metal rubber blank are consistent, it is preferably wound by the method described in patent application CN 118595338A. The blanks of the embodiments of the present invention and the comparative examples are wound by the method described in patent application CN 118595338A.

[0107] The stamping process in step S5 can be used to stamp the blank into a rectangular blank of the required size by using a conventional stamping process, see Figure 12-13 .

[0108] As an optional implementation of the present invention, in step S5, the length of the rectangular blank is L, the width is W, and the width W of the rectangular blank satisfies the following formula (4):

[0109] W=π×(r1+r2) / n(4).

[0110] In step S6, the stamping and molding can be performed by using conventional stamping and molding processes to stamp and mold the rectangular blank into a metal rubber sector of required size and specifications, see Figure 14-15 :

[0111] The stamping molding mold is a rectangular parallelepiped with a fan-shaped groove. The inner diameter R of the fan-shaped groove in the mold is equal to the inner diameter r2 of the metal rubber fan-shaped part. The length of the mold is equal to the length L of the rectangular parallelepiped blank. The central angle of the fan-shaped groove is equal to the central angle of the metal rubber fan-shaped part as described above, which is 360° / n.

[0112] As an optional embodiment of the present invention, during the stamping process, the outer chord α1 of the metal rubber sector satisfies the following formula (5):

[0113] α1=2π×r1 / n(5)

[0114] The inner chord α2 of the metal rubber sector satisfies the following formula (6):

[0115] α2=2π×r2 / n(6)

[0116] Specifically, according to the outer and inner chords of the metal rubber fan-shaped parts, the size and shape of the mold required for stamping and shaping can be more accurately defined to ensure that the mold and the fan-shaped parts fit perfectly. As a result, the metal rubber fan-shaped parts finally obtained can show the best fatigue performance, that is, they can still maintain their structural integrity and functional reliability under long-term alternating loads or cyclic stress conditions, greatly extending their service life and meeting the application requirements under harsh working conditions.

[0117] As an optional implementation manner of the present invention, the mass of the metal rubber in the metal rubber sector satisfies the following formula (7):

[0118] m=ρ×V=ρ×π×(r1 2 -r2 2 )×L / n(7)

[0119] Wherein, ρ is the density of the metal rubber sector, which is a preset fixed value;

[0120] L is the length of the rectangular blank or the length of the metal rubber ring or the length of the metal rubber sector, which is a preset fixed value.

[0121] The weight of the metal wire used for each metal rubber sector can be determined by formula (7), thereby determining the weight of the metal wire required for each blank.

[0122] As an optional embodiment of the present invention, the density ρ of the metal rubber in the metal rubber sector is 3.5-5.5 g / cm 3 (For example, 3.8 g / cm 3 , 4.0 g / cm 3 4.2 g / cm 3 , 4.4 g / cm 3 , 4.6 g / cm 3 , 4.8 g / cm 3 , 5.0 g / cm 3 , 5.2 g / cm 3 , 5.4 g / cm 3 wait).

[0123] The length of the rectangular blank or the length of the metal rubber ring or the length L of the metal rubber sector can be determined according to the use environment. The direction of L is Figure 3 The axial direction of the shock absorber is consistent. As an optional embodiment of the present invention, the length L is 25-35 mm (such as 26 mm, 28 mm, 30 mm, 32 mm, 34 mm, etc.).

[0124] A fourth aspect of the present invention, as Figure 3 As shown, a spherical plain bearing vibration damper with high load-bearing and fatigue-resistant characteristics is provided, comprising a spherical plain bearing outer ring unit 1, a metal rubber ring, a spherical plain bearing inner ring unit 4 and a spherical plain bearing sleeve 3;

[0125] The inner surface of the spherical bearing outer ring unit 1 is tangent to the outer surface of the spherical bearing inner ring unit 4. A metal rubber ring is provided between the inner surface of the spherical bearing inner ring unit 4 and the groove of the spherical bearing sleeve 3. The metal rubber ring is composed of n metal rubber sector pieces 2 as described above.

[0126] The present invention will be further described in detail below with reference to specific embodiments and comparative examples.

[0127] Example 1

[0128] The composition of the SWPB metal wire used in this embodiment is shown in Table 1:

[0129] Table 1

[0130]

[0131] S1: Place a 0.3 mm SWPB wire in a muffle furnace for heat treatment at a temperature of 410°C for 10 min, and immediately take it out for air cooling after the heat treatment.

[0132] According to "HB 5177-1996 Metal Wire Tensile Test Method", the performance of the heat-treated metal wire was tested, and its tensile strength was 2020MPa and the elongation was 4.0%;

[0133] S2: Winding the heat-treated metal wire into a metal wire spiral coil and stretching it to a certain pitch (3.5 mm);

[0134] S3: spirally winding the metal wire to obtain blanks, the weight of the metal wire used for each blank is 9.3 g;

[0135] S4: In this embodiment, according to the required metal rubber ring, the outer diameter is preset to be 22.7 mm and the inner diameter is preset to be 17 mm, that is, the outer diameter r1 of the metal rubber sector is 22.7 mm and the inner diameter r2 is 17 mm;

[0136] According to the preset outer diameter r1 and inner diameter r2 of the metal rubber sector, the thickness H of the metal rubber sector is determined to be r1-r2=5.7mm;

[0137] Further, according to the formula r1×(1-cos(360° / 2n))≤γ×H, it is calculated that n≥8.82. In this embodiment, n is 9, that is, the required metal rubber ring is designed to be 9 equal parts of metal rubber sector-shaped parts, and the central angle of each metal rubber sector-shaped part is θ=360° / n=40°;

[0138] S5: Based on the number of the metal rubber sector pieces being 9, the blank is stamped to obtain 9 rectangular blanks; and the width of the rectangular blank is determined to be W=π×(r1+r2) / n=13.85 mm;

[0139] S6: Place the 9 cuboid blanks in a Figure 1-Figure 2 Stamping and shaping are performed in the mold shown to obtain 9 metal rubber sector parts;

[0140] The length of the mold is 28.00 mm, the height is 15.00 mm, and the width is 17.14 mm. The inner diameter R of the sector groove is 17 mm, the central angle of the sector groove is 40°, and the widest width of the sector groove is 15.14 mm.

[0141] Before stamping and shaping, the outer chord of the metal rubber sector is calculated as:

[0142] α1=2π×r1 / n=142.556 / 9=15.84mm;

[0143] The inner chord is:

[0144] α2=2π×r2 / n=106.76 / 9=11.86mm;

[0145] The density of the metal rubber sector used in this embodiment is 4.24 g / cm 3 , L is 28mm, through the formula m=ρ×V / n=ρ×π×(r1 2 -r2 2 )×L / n, the mass m of the metal rubber in the metal rubber sector is calculated to be 9.3g, which is the weight of the blank. Figure 4-5 , which is a physical picture of a single metal rubber sector manufactured in this embodiment.

[0146] S7: Figure 6 , which is a physical diagram of a spherical plain bearing shock absorber with high load-bearing and fatigue-resistant characteristics provided in this embodiment, including a spherical plain bearing outer ring unit 1, a metal rubber ring, a spherical plain bearing inner ring unit 4 and a spherical plain bearing sleeve 3;

[0147] The inner surface of the spherical bearing outer ring unit 1 is tangent to the outer surface of the spherical bearing inner ring unit 4. A metal rubber ring is provided between the inner surface of the spherical bearing inner ring unit 4 and the groove of the spherical bearing sleeve 3. The metal rubber ring is composed of 9 metal rubber sector pieces 2 as described above.

[0148] Comparative Example 1:

[0149] The main difference between this comparative example and Example 1 is that the SWPB metal wire is not heat treated in step S1, the tensile strength of the SWPB metal wire is 2704 MPa, the elongation is 2.0%, and the density of the metal rubber is 4.85 g / cm 3 , L is 28 mm, the outer diameter r1 of the metal rubber sector is 22.7 mm, the inner diameter r2 is 17 mm, and the remaining steps and technical parameters are the same as those in Example 1. Finally, the mass m of the metal rubber in the metal rubber sector is 10.7 g.

[0150] Comparative Example 2

[0151] The main difference between this comparative example and Example 1 is that the temperature of the heat treatment process in step S1 is 450°C, the tensile strength of the metal wire after heat treatment is 1780MPa, the elongation is 3.2%, and the density ρ of the metal rubber is 3.85g / cm 3 , L is 28 mm, the outer diameter r1 of the metal rubber sector is 22.7 mm, the inner diameter r2 is 17 mm, and the remaining steps and technical parameters are the same as those in Example 1. Finally, the mass m of the metal rubber in the metal rubber sector is 8.5 g.

[0152] Comparative Example 3

[0153] The difference between this comparative example and Example 1 is that in this comparative example, n is 3, r1 is 22.7 mm, r2 is 17 mm, the central angle corresponding to the single metal rubber sector is 360° / n=120°, and during the stamping and shaping process, the outer chord α1 of the metal rubber sector is 47.52 mm and the inner chord α2 is 35.58 mm. The width W of the rectangular blank obtained by stamping is 41.55 mm. The remaining steps and technical parameters are the same as those in Example 1. The mass m of the metal rubber in the metal rubber sector finally obtained is 28.1 g.

[0154] Comparative Example 4

[0155] Compared with Example 1, this comparative example adopts only one-step molding, that is, S5 and S6 are combined into one step, and the remaining steps and technical parameters are the same as those of Example 1. Specifically:

[0156] The obtained n blanks are placed in the mold in step S6 of embodiment 1, that is, Figure 1-2 In the stamping and shaping die shown, stamping is performed once or multiple times; the metal rubber fan-shaped part prepared in this comparative example cannot be formed normally due to broken wires.

[0157] Only a single die is used for stamping. Since the workpiece is fan-shaped, the workpiece itself has a certain resilience, and the specimen has a large density and a large stiffness. If only a single die is used for stamping, the number of stampings is small, and the formability of the target size of the metal rubber cannot be guaranteed; if forced stamping is repeated many times to overcome the large stiffness and resilience, the density of the metal rubber fan-shaped piece in contact with the vertex of the die groove (corresponding to the vertex of the fan-shaped piece) will be greater than the target value (target density), while the density of the wings on both sides of the fan-shaped piece is low, resulting in a very uneven density of the fan-shaped piece; in actual working conditions, the lower density part is prone to premature failure (that is, wire breakage), while the higher density point may have a load-bearing capacity far beyond the required, but will significantly reduce the vibration reduction effect of the metal rubber.

[0158] Performance Testing

[0159] The present invention conducts a 60h cyclic fatigue compression test on the embodiment and the comparative example. The experimental parameters are set to a cosine wave control with a maximum load of 40KN and a frequency of 10Hz. Static compression tests are performed on the embodiment and the comparative example every 12h. The test data after 60h are shown in Table 2. The test results every 12h are shown in Table 2. Figure 9-11 .

[0160] Among them, Figure 7 As shown, the surface of the metal rubber fan-shaped part in Comparative Example 3 is seriously flying, such as Figure 8 As shown, the metal rubber sector in Comparative Example 4 cannot be formed normally, and therefore normal tooling testing cannot be performed.

[0161] Performance data

[0162] Table 2

[0163]

[0164] From Table 1 and Figure 4-Figure 8 It can be seen that the solution of the present invention can solve the problem of flying wires easily appearing on the surface of high-density metal rubber sector parts during molding, and can obtain metal rubber sector parts with high load-bearing capacity and fatigue resistance.

[0165] As shown in Table 1 and Fig. 9 As shown, Example 1 exhibits relatively stable stiffness during the fatigue cycle compression test, and the reduction in the stiffness of the metal rubber before and after the experiment is relatively small.

[0166] As shown in Table 1 and Fig.10 As shown, in the cyclic fatigue test, the stiffness of comparative example 1 was relatively stable in the first half of the experiment (36 hours before the experiment), and the stiffness showed a significant downward trend in the second half of the experiment. The loss of stiffness of the metal rubber before and after the test was quite obvious.

[0167] As shown in Table 1 and Fig.11 As shown, the stiffness of Comparative Example 2 began to drop significantly at the beginning of the cyclic fatigue test (the first 12 hours), and the stiffness continued to drop at a large rate during the subsequent fatigue test. The stiffness loss of the metal rubber was the largest before and after the test.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A metal rubber sector, characterized in that: n metal rubber sector pieces of the same size are assembled into a metal rubber ring; The thickness and n of the metal rubber sector satisfy the following formulas (1) and (2): r1×(1-cos(360° / 2n))≤γ×H(1); H= r1-r2（2）； Among them, γ=1 / 4; H is the thickness of the metal rubber sector, in mm; r1 is the outer diameter of the metal rubber sector, in mm; r2 is the inner diameter of the metal rubber sector, in mm; The method for preparing the metal rubber sector comprises the following steps: S1: According to the formulas (1)-(2) described above, the required metal rubber ring is designed to be divided into n equal parts of metal rubber sector-shaped parts; and the mass of metal wire required for each metal rubber sector-shaped part is calculated according to the density of the designed metal rubber sector-shaped parts; S2: heat-treating the corresponding mass of the metal wire, and immediately taking it out for air cooling after the heat treatment; S3: Winding the heat-treated metal wire into a metal wire spiral coil; S4: spirally winding the metal wire to obtain a blank; S5: Based on the number n of the metal rubber sector pieces, respectively stamping the n blanks to obtain n rectangular blanks; S6: stamping and shaping the n rectangular blanks to obtain n metal rubber sector parts.

2. The metal rubber sector according to claim 1, characterized in that: r2 is 10-20mm; r1 is 20-30mm; And H=r1-r2≥5mm.

3. The metal rubber sector according to claim 1, characterized in that: The central angle of the metal rubber sector satisfies the following formula (3): θ = 360° / n (3); Wherein, θ is the central angle of the metal rubber sector; The range of the central angle is 0<θ≤40.8°.

4. The metal rubber sector according to claim 1, characterized in that: In step S1, the metal wire includes one of SWPB metal wire, EN10270-1 DM metal wire and Roslau metal wire; And / or, the diameter of the metal wire is 0.15-0.3 mm; And / or, in step S2, the heat treatment temperature is 400°C to 420°C; the heat preservation time is 8 to 15 minutes; And / or, the tensile strength of the metal wire after heat treatment is: 1900MPa-2200MPa, and the elongation is: 4%-5%; And / or, in step S3, the pitch of the metal wire spiral coil is 2.5-3.5 mm.

5. The metal rubber sector according to claim 1, characterized in that: In step S5, the length of the rectangular blank is L, and the width is W. The width W of the rectangular blank satisfies the following formula (4): W=π×(r1+r2) / n(4).

6. The metal rubber sector according to claim 1, characterized in that: During the stamping process, the outer chord α1 of the metal rubber sector satisfies the following formula (5): α1=2π×r1 / n（5）； The inner chord α2 of the metal rubber sector satisfies the following formula (6): α2=2π×r2 / n（6）。 7. The metal rubber sector according to claim 1, characterized in that: The mass of the metal rubber or each blank in the metal rubber sector satisfies the following formula (7): m=ρ×V=ρ×π×(r1 2 -r2 2 )×L / n(7); Where ρ is the density of the metal rubber sector, ρ is 3.5-5.5 g / cm 3 ; L is the length of the rectangular blank or the length of the metal rubber ring or the length of the metal rubber sector, and L is 25-35 mm.

8. A metal rubber ring, characterized in that: The metal rubber ring is composed of n metal rubber sector pieces of the same size as described in any one of claims 1 to 7; The thickness, outer diameter and inner diameter of the metal rubber ring are all equal to those of the metal rubber sector as claimed in any one of claims 1 to 7.

9. A spherical bearing vibration damper with high load-bearing and fatigue-resistant characteristics, characterized in that: It comprises a spherical plain bearing outer ring unit, a metal rubber ring as claimed in claim 8, a spherical plain bearing inner ring unit and a spherical plain bearing sleeve; The inner surface of the spherical bearing outer ring unit is tangent to the outer surface of the spherical bearing inner ring unit, and a metal rubber ring is provided between the inner surface of the spherical bearing inner ring unit and the groove of the spherical bearing sleeve, and the metal rubber ring is composed of n metal rubber fan-shaped parts as described in any one of claims 1-7.

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