Shock absorbing member

Abstract

To provide a shock absorbing member.SOLUTION: A shock absorbing member includes: a first pressing body and a second pressing body facing each other in a first direction; and one or more spring sections integrated with the first pressing body and the second pressing body between the first pressing body and the second pressing body. The shock absorbing member causes spring force to apply in a direction in which the first pressing body and the second pressing body approach each other or separate from each other along the first direction. The outer contour area S of the first pressing body or the second pressing body along a surface including the first pressing body or the second pressing body is larger than a square of the value of the thickness along the first direction of the whole including the first pressing body, the second pressing body, and the spring section. A value of (electric resistance in the thickness direction measured between the outer surface of the first pressing body and the outer surface of the second pressing body / electric resistance in a surface direction measured between one side in the surface direction of the first pressing body and one side in the surface direction of the second pressing body and the other side in the surface direction of the first pressing body and the other side in the surface direction of the second pressing body) is less than 10.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a shock-absorbing member.

Background Art

[0002] Springs are widely used in many industrial devices and equipment, such as semiconductor manufacturing equipment, impact tools, sintering jigs, automobiles, etc. Since the required characteristics of springs are diverse, various shapes suitable for applications, including coil springs and leaf springs, have been developed. In order to exhibit the properties of a spring, a bending mechanism or a folding mechanism is required. Currently, springs are manufactured by machining using a press machine or a forming machine with a plate material or a wire material. In the existing technology, it is difficult to achieve both the curved structure and the planar structure required for the manifestation of spring characteristics, and there are technical restrictions on the structure of the spring, resulting in the following problems.

[0003] In the technologies described in Patent Document 1 and Patent Document 2 below, when a spring is used in a place where thermoelectric and conductive properties are required, the flatness of the spring is low, so there is a problem that the performance is not improved. Furthermore, there is also a problem that the stress concentrates on a part of the spring, leading to damage to the spring itself or the members adjacent to the spring.

[0004] There is a known prior art that attempts to solve the above problems by combining two types of leaf springs to enhance the contact with adjacent members adjacent to the spring. For example, in the technology described in Patent Document 3 below, in order to solve the problem with a disc spring, it is used in a multilayer stack. Also, as described in Patent Document 4 below, a spring with high flatness incorporating a torsion structure has been proposed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

[0006] However, in the technologies described in the above-mentioned Patent Documents 3 and 4, a certain spring height is required, there are limitations in applying to a device with high flatness, and there is a problem that the device becomes large-sized.

[0007] The present invention was devised in view of the above problems, and an object thereof is to provide a shock-absorbing member that is not easily restricted in thickness as a shock-absorbing member and has high flatness. [Means for Solving the Problems]

[0008] As a result of various studies, the present invention has found that a shock-absorbing member capable of solving these problems can be provided using a 3D printer, and has reached the present invention.

[0009] (1) A shock-absorbing member according to one embodiment of the present invention has a first pressing body and a second pressing body facing each other in a first direction, and one or more spring portions integrated with the first pressing body and the second pressing body are provided between the first pressing body and the second pressing body, and the first pressing body and the second pressing body apply a spring force in a direction of approaching or separating along the first direction. The outer contour area S of the first pressing body or the second pressing body along the surface including the first pressing body or the second pressing body is larger than the square of the value of the thickness along the first direction of the whole including the first pressing body, the second pressing body, and the spring portion, and (the electrical resistance in the thickness direction measured between the outer surface of the first pressing body and the outer surface of the second pressing body / the electrical resistance in the surface direction measured between one side in the surface direction of the first pressing body and one side in the surface direction of the second pressing body, and the other side in the surface direction of the first pressing body and the other side in the surface direction of the second pressing body) is less than 10.

[0010] (2) In one form of the shock-absorbing member according to the present invention, it is preferable that the compressive strength along the first direction is in the range of 0.1 MPa or more and 5 MPa or less, and the Young's modulus is in the range of 0.4 MPa or more and 70 MPa or less. (3) In one form of the shock-absorbing member according to the present invention, the first pressing body, the second pressing body, and the spring portion are all integrally formed products made of metal, and the first pressing body, the second pressing body, and the spring portion are made of any one of Ti or a Ti alloy containing 0.5% by mass or more of Ti, Cu or a Cu alloy containing 0.5% by mass or more of Cu, Al or an Al alloy containing 0.5% by mass or more of Al, and Fe or an Fe alloy containing 0.5% by mass or more of Fe.

[0011] (4) In one form of the shock-absorbing member according to the present invention, the first pressing body and the second pressing body are frame-shaped, and between the first pressing body and the second pressing body, a first spring portion composed of a curved plate having both ends integrated with the first pressing body and a second spring portion composed of a curved plate having both ends integrated with the second pressing body are provided with their central portions butted against each other. (5) In one form of the shock-absorbing member according to the present invention, the first pressing body and the second pressing body are frame-shaped, and between the first pressing body and the second pressing body, a plurality of columnar spring portions are provided, one end of which is integrated with the first pressing body, the other end of which is integrated with the second pressing body, and which are inclined in the thickness direction of the first pressing body or the second pressing body.

Advantages of the Invention

[0012] According to one form of the present invention, assuming that a force acts between the first pressing body and the second pressing body due to the action of the spring portion integrally provided between the first pressing body and the second pressing body, when an impact acts along the first direction by exerting an appropriate spring force, a shock-absorbing member capable of shock absorption can be provided. In addition, since the outer contour area S of the first pressing body or the second pressing body is larger than the square of the value of the thickness along the first direction of the whole including the first pressing body, the second pressing body, and the spring part, it is suitable as a shock-absorbing member with a small thickness (spring height) and high flatness, and a shock-absorbing member that can be easily applied to a device with high flatness can be provided. Furthermore, since the ratio of the electrical resistance in the thickness direction to the electrical resistance in the plane direction including the first pressing body, the second pressing body, and the spring part is less than 10, it has a suitable characteristic as a shock-absorbing member that can provide shock absorption by the spring action even when applied to a part that requires electrical conductivity.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0014] Hereinafter, the present invention will be described in detail based on embodiments, but the present invention is not limited to the embodiments described below. (First Embodiment) As shown in FIG. 1, the shock-absorbing member A according to the first embodiment includes a rectangular frame-shaped first pressing body 1 and a second pressing body 2 that are vertically arranged at a distance in the first direction (vertical direction: Z direction). In addition, a first spring part 3 and a second spring part 4 made of curved plates are integrated between the first pressing body 1 and the second pressing body 2, and the shock-absorbing member A is configured. The first pressing body 1 is formed by integrating four narrow flat frame members 1A into a rectangular shape in plan view. The second pressing body 2 is formed by integrating four narrow flat frame members 2A into a rectangular shape in plan view. In the embodiment shown in FIG. 1, the frame member 1A and the frame member 2A have the same shape in plan view and have the same thickness in the Z direction. In the embodiment shown in FIG. 1, the first pressing body 1 and the second pressing body 2 have the same shape in plan view and have the same thickness in the Z direction.

[0015] Hereinafter, it will be described on the assumption that the XY plane formed by the X direction and the Y direction orthogonal to the thickness direction (Z direction) of the first pressing body 1 or the second pressing body 2 is parallel to the upper surface or the lower surface of the first pressing body 1 or the second pressing body 2. Also, in the example of FIG. 1, among the four frame members 1A constituting the first pressing body 1 having a rectangular shape in plan view, two extend parallel to the X direction, and the remaining two extend parallel to the Y direction, and thus the shock buffer member A is depicted.

[0016] In the embodiment shown in FIG. 1, the frame member 1A and the frame member 2A have the same shape in plan view, but they do not necessarily have the same shape in plan view and may have different shapes. Also, in the form of FIG. 1, the first pressing body 1 and the second pressing body 2 have the same shape in plan view, but they do not necessarily have the same shape in plan view and may have different shapes. For example, at least one of the first pressing body 1 and the second pressing body 2 may be in a circular frame shape or a polygonal frame shape, may be in a disc shape or a square plate shape, and they may have different shapes from each other. The first pressing body 1 and the second pressing body 2 are preferably in a thin frame shape or a plate shape in order to reduce the overall thickness of the shock buffer member A as much as possible. Alternatively, a structure in which through holes are formed in part after being formed into a plate shape to adjust the weight may be adopted. The shape in which the first pressing body 1 and the second pressing body 2 are plate-shaped, the through holes are made as large as possible, and the areas of the first pressing body 1 and the second pressing body 2 are reduced corresponds to the embodiments shown in FIGS. 1 and 2.

[0017] The first spring part 3 is composed of a curved plate wider than the frame member 1A, and the second spring part 4 is composed of a curved plate wider than the frame member 2A. The first spring part 3 is integrated so as to span between the frame members 1A, 1A arranged to face each other along a direction orthogonal to the Z direction, for example, the X direction. One end portion (one end portion in the X direction) 3a in the length direction of the first spring part 3 is integrated with the frame member 1A on one side in the X direction, and the other end portion (the other end portion in the X direction) 3b in the length direction is integrated with the frame member 1A on the other side in the X direction. One end portion 3a in the length direction of the first spring part 3 is integrally overlapped with the lower surface of the central portion in the length direction of the frame member 1A on one side in the X direction. The other end portion 3b in the length direction of the first spring part 3 is integrally overlapped with the lower surface of the central portion in the length direction of the frame member 1A on the other side in the X direction. The curved plate constituting the first spring part 3 has its concave surface portion 3A facing upward of the frame member 1A and its convex surface portion 3B facing downward of the frame member 1A, and is integrated with the frame member 1A. The convex surface portion 3B of the first spring part 3 is arranged downward, but the lowermost portion in the convex surface portion 3B is located at the central portion of the frame member 1A in plan view. Both ends of the first spring part 3 are integrated with the first pressing body 1.

[0018] The second spring part 4 is arranged so as to span between the frame members 2A, 2A arranged to face each other along a direction orthogonal to the Z direction, for example, the X direction. One end portion (one end portion in the X direction) 4a in the length direction of the second spring part 4 is integrated with the frame member 2A on one side in the X direction, and the other end portion (the other end portion in the X direction) 4b in the length direction is integrated with the frame member 2A on the other side in the X direction. One end portion 4a in the length direction of the second spring part 4 is integrally overlapped with the upper surface of the central portion in the length direction of the frame member 2A on one side in the X direction. The other end portion 4b in the length direction of the second spring part 4 is integrally overlapped with the upper surface of the central portion in the length direction of the frame member 2A on the other side in the X direction. The curved plate constituting the second spring part 4 has its concave surface portion 4A facing downward of the frame member 2A and its convex surface portion 4B facing upward of the frame member 2A, and is integrated with the frame member 2A. The convex surface portion 4B of the second spring part 4 is arranged upward, but the uppermost portion in the convex surface portion 4B is located at the central portion of the frame member 2A in plan view. The central portion in the longitudinal direction (central portion in the X direction) of the first spring portion 3 and the central portion in the longitudinal direction (central portion in the X direction) of the second spring portion 4 are integrated so as to overlap in the vertical direction (Z direction). Both ends of the second spring portion 4 are integrated with the second pressing body 2.

[0019] As an example, the distance from the upper surface of the frame member 1A to the lower surface of the frame member 2A can be expressed as the overall thickness of the shock buffer member A, and the thickness of the shock buffer member A can be about 2.5 mm. Also, the lengths of the frame members 1A and 2A can be expressed as the lateral width or the longitudinal width of the shock buffer member A, but in the form shown in FIG. 1, both the lateral width and the longitudinal width can be set to about 10 mm × 10 mm at maximum and about 1 mm × 1 mm at minimum as an example.

[0020] Note that in the present embodiment, the first spring portion 3 and the second spring portion 4 may extend in the Y direction, and the first spring portion 3 may extend in the X direction or the Y direction, and the second spring portion 4 may extend in the Y direction or the X direction, and they may be arranged so as to be orthogonal in plan view. Also, a plurality of first spring portions 3 and second spring portions 4 may be provided respectively. Furthermore, the first spring portion 3 and the second spring portion 4 may be formed so as to intersect in an X shape in plan view, and both ends thereof may be integrated with the corner portions of the first pressing body 1 and the second pressing body 2.

[0021] The shock buffer member A including the first pressing body 1, the second pressing body 2, the first spring portion 3, and the second spring portion 4 is integrally formed of a metal material exemplified below. The shock buffer member A is configured as an integrally formed product by a 3D printer using, for example, a metal material. The shock buffer member A is preferably made of any one of Ti or a Ti alloy containing 0.5 mass% or more of Ti, Cu or a Cu alloy containing 0.5 mass% or more of Cu, Al or an Al alloy containing 0.5 mass% or more of Al, and Fe or an Fe alloy containing 0.5 mass% or more of Fe. More specifically, it is preferably made of any one of Ti or a Ti alloy containing 95 mass% or more of Ti, Cu or a Cu alloy containing 95 mass% or more of Cu, Al or an Al alloy containing 95 mass% or more of Al, and Fe or an Fe alloy containing 95 mass% or more of Fe. The impact buffer member A may be made of resin when it has the above-described configuration and satisfies the following characteristics.

[0022] The impact buffer member A preferably has a compressive strength along the first direction (Z direction: thickness direction) of 0.1 MPa or more and 5 MPa or less. If the compressive strength of the impact buffer member A is less than 0.1 MPa, the strength is too weak and the cushioning property as an impact buffer member becomes insufficient. If the compressive strength of the impact buffer member A exceeds 5 MPa, the impact buffer member A becomes too hard and cannot buffer the impact. Also, being too hard may damage the adjacent member arranged adjacent to the impact buffer member A. The impact buffer member A preferably has a Young's modulus along the first direction (Z direction: thickness direction) of 0.1 MPa or more and 70 MPa or less. If the Young's modulus of the impact buffer member A is less than 0.1 MPa, the strength is too weak and the impact cannot be buffered. If the Young's modulus of the impact buffer member A exceeds 70 MPa, the impact buffer member A becomes too rigid and cannot buffer the impact. Also, being too hard may damage the adjacent member arranged adjacent to the impact buffer member A.

[0023] In the case of the impact buffer member A, the value of "electrical resistance in the thickness direction (Z direction) / electrical resistance in the plane direction (xy direction)" is preferably less than 10. More specifically, (electrical resistance in the thickness direction measured between the outer surfaces of the first pressing body 1 and the second pressing body 2 / electrical resistance in the plane direction measured between one side in the plane direction of the first pressing body 1 and the second pressing body 2 and the other side in the plane direction of the first pressing body 1 and the second pressing body 2) is preferably less than 10. Also, the value of "electrical resistance in the thickness direction (Z direction) / electrical resistance in the plane direction (xy direction)" is preferably less than 8.0, and more preferably less than 5.0. Also, the value of the ratio of the above-described electrical resistances is preferably 0.01 or more, and preferably 0.1 or more, considering the relationship between the electrical resistance value of the metal material used and the size of the impact buffer member A.

[0024] As an example, for instance, to measure the electrical resistance in the thickness direction of the shock-absorbing member A, a Cu block plated with Au is connected to the tip of one measurement terminal of a tester for measuring resistance, and a Cu block plated with Au is connected to the tip of the other measurement terminal of the tester. Then, one Cu block is uniformly pressed against the outer surface (the upper surface in FIG. 1) of the first pressing body 1, and the other Cu block is uniformly pressed against the outer surface (the lower surface in FIG. 1) of the second pressing body 2 to measure the electrical resistance. Thereby, the electrical resistance in the thickness direction of the shock-absorbing member A can be measured.

[0025] To measure the electrical resistance in the plane direction of the shock-absorbing member A, it is measured using a tester with the aforementioned Cu block connected to the measurement terminal. One Cu block is brought into contact with one side of the outer peripheral surface of the first pressing body 1 and one side of the outer peripheral edge of the second pressing body 2, and the other Cu block is brought into contact with the other side of the outer peripheral edge of the first pressing body 1 and the other side of the outer peripheral edge of the second pressing body 2. In this state, the electrical resistance in the plane direction of the shock-absorbing member A can be measured. When the Cu block is brought into contact with one side of the first pressing body 1 and one side of the second pressing body 2, it is preferable to bring it into contact evenly with one side surface of the first pressing body 1 and one side surface of the second pressing body 2. As an example, one side and the other side of the outer peripheral edge of the first pressing body 1 may be the one side and the other side in the X direction or the one side and the other side in the Y direction in the plane direction of the first pressing body 1. As an example, one side and the other side of the outer peripheral edge of the second pressing body 2 may be the one side and the other side in the X direction or the one side and the other side in the Y direction in the plane direction of the second pressing body 2. When obtaining the ratio of the aforementioned electrical resistance value in the thickness direction to the aforementioned electrical resistance value in the plane direction, the ratio of the thickness direction resistance value to the plane direction resistance value can be obtained.

[0026] The method for manufacturing the shock-absorbing member A uses the target metal powder made of the aforementioned metal material, stacks a three-dimensional regular skeleton structure by a binder jet type 3D printer, heats it to a high temperature of about 250 °C to cure the binder, and passes through a processing step and a sintering step as necessary to obtain the target shock-absorbing member A. When manufacturing the shock-absorbing member A having the structure shown in FIG. 1, first, a precursor B for forming the shock-absorbing member having the shape shown in FIG. 2 is produced. This precursor B has a rectangular frame-shaped first frame body 11 having a shape corresponding to the first pressing body 1 and a rectangular frame-shaped second frame body 12 having a shape corresponding to the second pressing body 2, and a first spring portion 3 and a second spring portion 4 are formed between the first frame body 11 and the second frame body 12.

[0027] The difference between the precursor B and the shock-absorbing member A is that the corner portions of the first frame body 11 and the second frame body 12 are connected by the support columns 13. In a binder jet type 3D printer, since a three-dimensional object (three-dimensional regular skeletal structure) is formed by laminated manufacturing using metal powder, after forming the second frame body 12, the second spring portion 4 is formed, then the first spring portion 3 is formed, and finally the first frame body 11 is laminated and manufactured. In this case, the second spring portion 4 is formed while forming the support columns 13 on the second frame body 12, then the first spring portion 3 is formed, and finally the first frame body 11 is formed so as to be connected to the support columns 13. If the precursor B is formed, by removing the four support columns 13 formed at the corner portions of the first frame body 11 and the second frame body 12 by cutting, the shock-absorbing member A having the configuration shown in FIG. 1 can be obtained. In FIG. 2, the cutting positions set when removing the support columns 13 are shown by dashed lines. By cutting and removing the support columns 13, the first frame body 11 becomes the first pressing body 1, and the second frame body 12 becomes the second pressing body 2.

[0028] In the shock-absorbing member A having the configuration described above, between the first pressing body 1 and the second pressing body 2, there are spring portions 3 and 4 integrally provided therewith. Therefore, assuming that a compressive force and an impact force in the Z direction (the first direction: the thickness direction) act between the first pressing body 1 and the second pressing body 2 due to the action of the spring portions 3 and 4, it is possible to provide a shock-absorbing member A that can exert an appropriate spring force to relieve the compressive force and buffer the impact force along the Z direction. Further, in the shock-absorbing member A, the outer contour area S of the first pressing body 1 or the second pressing body 2 is set to be larger than the square of the value of the thickness along the Z direction (the first direction) of the portion including the first pressing body 1, the second pressing body 2, and the spring portions 3 and 4. Here, the outer contour area S of the first pressing body 1 means the area represented by the length of the frame member 1A × the length of the frame member 1A. The outer contour area S of the second pressing body 2 means the area represented by the length of the frame member 2A × the length of the frame member 2A.

[0029] Therefore, the shock-absorbing member A is suitable as a flat shock-absorbing member with a small thickness in the Z direction and high flatness, and can provide a shock-absorbing member A that is easy to apply to a device with high flatness. Furthermore, in the shock-absorbing member A, the ratio of the electrical resistance in the thickness direction including the first pressing body 1 and the second pressing body 2 to the electrical resistance in the surface direction is less than 10. Therefore, even when applied to a portion that requires electrical conductivity, a shock-absorbing member A that can exhibit a spring action while having good conductivity can be provided.

[0030] (Second Embodiment) FIG. 3 and FIG. 4 show the shock-absorbing member C of the second embodiment. The shock-absorbing member C has a first pressing body 15 and a second pressing body 16 having the same shape as the first pressing body 1 and the second pressing body 2 used in the first embodiment, and a plurality of columnar (four) spring portions 17 are provided therebetween. In the shock-absorbing member C, the first pressing body 15 is formed by integrally connecting four frame members 15A in a rectangular frame shape in plan view, similar to the first pressing body 1 of the first embodiment. In the shock-absorbing member C, the second pressing body 16 is formed by integrally connecting four frame members 16A in a rectangular frame shape in plan view, similar to the second pressing body 2 of the first embodiment.

[0031] As shown in FIG. 3 and FIG. 4 showing the second embodiment, the frame member 15A is formed to be slightly thinner than the frame member 1A of the first embodiment, and the frame member 16A is formed to be slightly thinner than the frame member 2A of the first embodiment. However, there is no particular limitation on the width and thickness of the frame members 15A and 16A, and they may be formed to have a width and thickness having a strength corresponding to the compression strength and Young's modulus required for the shock-absorbing member. Therefore, also in the second embodiment, similar to the first embodiment, the first pressing body 15 and the second pressing body 16 may be circular frame-shaped or polygonal frame-shaped, may be disc-shaped or square plate-shaped, and they may have different shapes from each other. The first pressing body 15 and the second pressing body 16 are preferably frame-shaped or plate-shaped with a small thickness in order to reduce the overall thickness of the impact buffer member A as much as possible. Alternatively, a structure may be adopted in which a through hole is formed in part after forming it into a plate shape to adjust the weight.

[0032] The four spring portions 17 are formed so as to extend in an oblique direction with respect to the thickness direction at each corner portion between the first pressing body 15 and the second pressing body 16. As shown in FIG. 3, each spring portion 17 integrally connects one end portion (lower end portion) 17a thereof to the upper surface of the corner portion of the second pressing body 16. Further, the other end portion (upper end portion) 17b of each spring portion 17 is integrally connected to the lower surface of the first pressing body 15 at a position slightly separated from the corner portion of the first pressing body 15. When the impact buffer member C is viewed in plan from the state shown in FIG. 3, the four spring portions 17 are arranged so as to be inclined in the counterclockwise direction of the second pressing body 16 starting from their one end portions 17a.

[0033] FIG. 4 shows a perspective view of the impact buffer member C shown in FIG. 3 when the vertical relationship between the first pressing body 15 and the second pressing body 16 is reversed. Therefore, in FIG. 4, when the impact buffer member C is viewed in plan from the state shown in FIG. 4, the four spring portions 17 are arranged so as to be inclined in the counterclockwise direction of the second pressing body 16 starting from their other end portions 17b. Note that the number of spring portions 17 provided in the impact buffer member C is not particularly limited, and in addition to each corner portion of the first pressing body 15 and the second pressing body 16 as shown in FIGS. 3 and 4, a necessary number may be provided in the portion between them.

[0034] As shown in FIGS. 3 and 4, each spring portion 17 is inclined and connected to the first pressing body 15 and the second pressing body 16. For this reason, even when a compressive force or an impact force acts in a direction to approach them with respect to the first pressing body 15 and the second pressing body 16, the four spring portions 17 can act a spring force by bending. In the examples shown in FIGS. 3 and 4, the inclination angles of the respective spring portions 17 are formed to be uniform within a range of about 35 to 40 degrees. The thickness of each spring portion 17 is formed to be such that the spring portion 17 does not protrude either inward or outward from the contour of the rectangular frame drawn when the first pressing body 15 and the second pressing body 16 are viewed in plan. For example, the width of the spring portion 17 along the width direction of the frame member 15A is equal to the width of the frame member 15A, and the thickness of the spring portion 17 in the direction orthogonal to the width direction is less than the length of the frame member 15A.

[0035] The impact buffer member C of the second embodiment is manufactured by a 3D printer from a material equivalent to the material constituting the impact buffer member A of the first embodiment. That is, it is preferably made of any one of Ti or a Ti alloy containing 0.5 mass% or more of Ti, Cu or a Cu alloy containing 0.5 mass% or more of Cu, Al or an Al alloy containing 0.5 mass% or more of Al, and Fe or an Fe alloy containing 0.5 mass% or more of Fe. Similar to the impact buffer member A, the impact buffer member C of the second embodiment preferably has a compressive strength along the thickness direction of 0.1 MPa or more and 10 MPa or less. Also, the Young's modulus along the thickness direction is preferably 0.1 MPa or more and 100 MPa or less. Furthermore, similar to the impact buffer member A, the impact buffer member C of the second embodiment preferably has a value of "electrical resistance in the thickness direction (Z direction) / electrical resistance in the plane direction (xy direction)" of less than 10.

[0036] By the impact buffer member C satisfying these conditions, the same operational effects as those of the impact buffer member A of the first embodiment can be obtained. For example, assuming that a compressive force or impact force in the thickness direction (Z direction) acts between the first pressing body 15 and the second pressing body 16 due to the action of the four spring portions 17, an impact buffer member C can be provided that can exhibit an appropriate spring force and buffer the compressive force or impact force along the thickness direction. Also, the impact buffer member C is suitable as a flat impact buffer member with a reduced thickness in the Z direction and high flatness, and an impact buffer member C that can be easily applied to a device with a high flatness in the plane Z can be provided. Furthermore, the ratio of the electrical resistance in the thickness direction to the electrical resistance in the surface direction, including the first pressing body 15 and the second pressing body 16, is less than 10. Therefore, even when applied to a portion that requires electrical conductivity, it is possible to provide an impact buffer member C that can exhibit a spring action while having good conductivity.

Example

[0037] The molding raw materials were adjusted by sieving metal powders made of the metals shown in Table 1 below so that the average particle size became 30 μm. Using these molding raw materials, a three-dimensional regular skeleton structure was laminated and formed using a binder jet type 3D printer (3D printer DMP2500 manufactured by Digital Metal), and the binder was cured at 250 ° C. to obtain a molded body. As a result, a molded body having the same shape as the precursor shown in FIG. 2 or a molded body having the same shape as the impact buffer member shown in the shape of FIG. 3 was obtained. The obtained molded body was degreased (heating temperature: 400 ° C., holding time: 2 hours), and then sintering treatment was carried out to obtain a sintered body having the same shape as the precursor shown in FIG. 2 having a three-dimensional regular skeleton structure or an impact buffer member having the shape shown in FIG. Regarding the sintered body having the same shape as the precursor shown in FIG. 2, the columnar portions formed at each corner portion were separated at the positions indicated by the chain lines in FIG. 2, and the four columnar portions were removed to obtain an impact buffer member having the shape shown in FIG.

[0038] The sample marked as a cantilever spring in Table 1 shows an impact buffer member having the configuration shown in FIG. 1, and the sample marked as Z-shaped shows an impact buffer member having the configurations shown in FIGS. 3 and 4. The first pressing body and the second pressing body have the same shape, and the vertical and horizontal sizes are as shown in Table 1, and the thickness (thickness in the Z direction) as the impact buffer member is as shown in Table 1. Regarding the metal powder used, when aluminum powder was used, the sintering temperature was set to 650 ° C. and the holding time was set to 5 hours. When copper powder was used, the sintering temperature was set to 1000 ° C. and the holding time was set to 5 hours. When stainless steel powder was used, the sintering temperature was set to 1300 ° C. and the holding time was set to 5 hours. When Ti powder was used, the sintering temperature was set to 1200 ° C. and the holding time was set to 2 hours.

[0039] (Comparative Example) Two stainless steel (SUS304-CSP) disc springs with an inner diameter of 6.4 mm, an outer diameter of 10.5 mm, and a thickness of 0.6 mm were prepared (Misumi: SSRBW6). These two were opposed to form a pair of springs, and they were sandwiched between two stainless steel (SUS316) plates (12 mm × 11 mm × 0.2 mm (thickness)).

[0040] Regarding the impact buffer member manufactured according to the description of the foregoing embodiment, the compressive strength was measured, the Young's modulus was calculated, and the electrical resistance was measured under the conditions described below. Also, two disc springs 20 and 21 manufactured according to the description of the comparative example were prepared. Their curved convex surfaces were aligned and butted at the center, and they were sandwiched between two stainless steel plates (corresponding to the first pressing body and the second pressing body: 12 mm in length, 11 mm in width) 22 and 23 on both sides in the thickness direction of the disc springs 20 and 21, and these were adhered to obtain a comparative example sample. Also in the comparative sample, since the two disc springs 20 and 21 are stacked in the Z direction, a buffering action by the spring force can be obtained when an impact force or the like is applied in the direction of approaching the plates 22 and 23 in the Z direction. However, in the comparative example sample, the plates 22 and 23 and the disc springs 20 and 21 are separate bodies and are only stacked and adhered and are not integrated. As the adhesive, one manufactured by Aron Alpha (Konishi Co., Ltd.) was used.

[0041] (Measurement of compressive strength and calculation of Young's modulus) A sample with a size of 10 mm × 10 mm was placed in a compression measurement jig with a size of 80 mm × 80 mm. It was placed in a compression measurement device (INSTRON 68-TM50) with a capacity of 50 kN, and pressure was applied in a direction perpendicular to the upper surface of the spring (the outer surface of the first pressing body). The position coordinates at this time were obtained using two linear gauges (Keyence Corporation AT-005V) and a controller (AT-V500), and a compressive stress-strain curve was obtained to calculate the compressive strength and Young's modulus. The comparative example sample was also tested in the same manner.

[0042] (Measurement of electrical resistance) Each sample was sandwiched along the Z direction between two copper blocks (area 30 mm × 40 mm) plated with gold, and the terminals of a tester (HIOKI 3560 AC mΩ HiTESTER) were connected to each block to measure the electrical resistance in the Z direction (the first direction). The first pressing body and the second pressing body of each sample were sandwiched between the two aforementioned blocks in a direction perpendicular to the Z direction, and the electrical resistance in the direction of each sample surface was measured using the aforementioned tester. When sandwiching the first pressing body and the second pressing body of each sample between the two blocks, the two blocks were arranged in the X direction such that one side in the X direction or the Y direction of the first pressing body and one side in the X direction or the Y direction of the second pressing body were surely in contact with one block, and the other side of the first pressing body and the other side of the second pressing body were surely in contact with the other block. The electrical resistance was also measured for the comparative example samples in the same manner.

[0043]

Table 1

[0044] As shown in Table 1, the shock-absorbing members of the integrally formed article according to the present invention composed of a metal have suitable compressive stress and Young's modulus in any case. Further, the shock-absorbing members of the examples have a feature that the area in the plane direction along the XY plane is larger than the value of the square of the thickness along the first direction, and the value of the ratio of the electrical resistance in the thickness direction to the electrical resistance in the plane direction is low. In the example samples of Table 1, the value of the square of the thickness is 4 to 23 mm 2 whereas the outer contour area is 74.4 to 488.4 mm 2 which is sufficiently large. The compressive strength is 0.1 to 5 MPa, and the Young's modulus is 0.4 to 70 MPa. The ratio of the electrical resistance in the thickness direction to the electrical resistance in the plane direction shows a sufficiently low value of 0.1 to 3.8. In contrast, in the comparative example samples, the ratio of the electrical resistance in the thickness direction to the electrical resistance in the plane direction is 21 or more than 1000, which is extremely large.

[0045] Therefore, in the case of the shock-absorbing member of the example, even if a force acts in the thickness direction, it is possible to provide a shock-absorbing member that can exhibit an appropriate spring force to buffer the shock. Moreover, if it is the impact buffer member of the embodiment, it is suitable as a flat impact buffer member with a reduced thickness and high flatness, and it is possible to provide an impact buffer member that can be easily applied to a device with high flatness. Furthermore, if it is the impact buffer member of the embodiment, even when applied to a portion that requires electrical conductivity, from the relationship between the electrical resistance ratio in the thickness direction and the surface direction, it is possible to provide an impact buffer member that can exhibit the above-described spring action while having good conductivity.

Explanation of Reference Numerals

[0046] A, C... impact buffer members, B... precursor, 1... first pressing body, 1A... frame material, 2... second pressing body, 2A... frame material, 3... first spring portion, 4... second spring portion, C... impact buffer member, 13... support portion, 15... first pressing body, 15A... frame material, 16... second pressing body, 16A... frame material, 17... spring portion.

Claims

1. It has a first pressing body and a second pressing body that face each other in a first direction, and one or more spring parts integrated with the first pressing body and the second pressing body are provided between the first pressing body and the second pressing body. It is a shock buffer member that applies a spring force in a direction in which the first pressing body and the second pressing body approach or separate along the first direction. The outer contour area S of the first pressing body or the second pressing body along the surface including the first pressing body or the second pressing body is larger than the square of the value of the overall thickness along the first direction including the first pressing body, the second pressing body, and the spring part. A shock buffer member, wherein the value of (electrical resistance in the thickness direction measured between the outer surface of the first pressing body and the outer surface of the second pressing body / electrical resistance in the surface direction measured between one side in the surface direction of the first pressing body and one side in the surface direction of the second pressing body, and the other side in the surface direction of the first pressing body and the other side in the surface direction of the second pressing body) is less than 10.

2. The shock buffer member according to claim 1, wherein the compressive strength along the first direction is in the range of 0.1 MPa or more and 5 MPa or less, and the Young's modulus is in the range of 0.4 MPa or more and 70 MPa or less.

3. The first pressing body, the second pressing body, and the spring part are all integrally formed of metal, and the first pressing body, the second pressing body, and the spring part are made of any one of Ti or a Ti alloy containing 0.5% by mass or more of Ti, Cu or a Cu alloy containing 0.5% by mass or more of Cu, Al or an Al alloy containing 0.5% by mass or more of Al, Fe or an Fe alloy containing 0.5% by mass or more of Fe. The shock buffer member according to claim 1 or claim 2, characterized by this.

4. The first pressing body and the second pressing body are frame-shaped, and between the first pressing body and the second pressing body, a first spring part composed of a curved plate integrally formed with the first pressing body at both ends and a second spring part composed of a curved plate integrally formed with the second pressing body at both ends are provided with their central parts butted against each other. The shock buffer member according to claim 1 or claim 2, characterized by this.

5. The first pressing body and the second pressing body are frame-shaped, and between the first pressing body and the second pressing body, a plurality of columnar spring parts are provided, one end of which is integrally formed with the first pressing body and the other end of which is integrally formed with the second pressing body and is inclined in the thickness direction of the first pressing body or the second pressing body. The shock buffer member according to claim 1 or claim 2, characterized by this.

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