Micro-miniature crossed reed flexible hinge and manufacturing method thereof

Abstract

The invention discloses a microminiature crossed reed flexible hinge and a manufacturing method thereof, the flexible hinge comprises an upper mounting seat, a middle mounting seat and a lower mounting seat which are arranged from top to bottom, an upper reed fixing groove is formed between the upper mounting seat and the middle mounting seat, and a lower reed fixing groove is formed between the middle mounting seat and the lower mounting seat; the two groups of upper reed assemblies are mounted between the upper mounting seat and the middle mounting seat; and the two groups of lower reed assemblies are mounted between the middle mounting seat and the lower mounting seat. According to the microminiature crossed reed flexible hinge and the manufacturing method thereof, the reeds are independently machined and can be cut from a flat plate, so that the lengths of the reeds can be freely controlled, and the whole hinge is microminiature. Through combined machining, it is guaranteed that two axes are perpendicular and coplanar, shaft holes in the two sides of a single axis are coaxial and equal in diameter, fixing grooves in the two sides of a single reed are coplanar, and therefore the high motion precision of the hinge is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of precision machinery technology, and in particular to a miniature cross-spring flexible hinge and a manufacturing method thereof. Background Art

[0002] The flexible hinge based on cross springs is a mechanical connection device that achieves specific movement through the elastic deformation of the springs. It has the characteristics of large range of motion, no need for lubrication, no wear, and zero backlash. It is widely used in precision instruments, micro-electromechanical systems, robotics and other fields.

[0003] Currently, performance analysis and calculation methods for cross-leaf flexure hinges are well established, and the basic structural form and design principles are well-defined. However, the structural space of miniature cross-leaf flexure hinges is severely limited, and their structural form and fabrication methods also present many difficulties.

[0004] Based on the above technical problems, technicians in this field urgently need to develop a miniature cross-spring flexible hinge and a manufacturing method thereof that is easy to achieve overall miniaturization and effectively improve movement accuracy. Summary of the Invention

[0005] The object of the present invention is to provide a miniature cross-spring flexible hinge and a manufacturing method thereof, which are convenient for realizing overall miniaturization and effectively improving movement accuracy.

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

[0007] A miniature cross-spring flexible hinge according to the present invention comprises:

[0008] An upper mounting seat, a middle mounting seat and a lower mounting seat are arranged from top to bottom, an upper spring fixing groove is formed between the upper mounting seat and the middle mounting seat, and a lower spring fixing groove is formed between the middle mounting seat and the lower mounting seat;

[0009] Two sets of upper spring assemblies installed between the upper mounting seat and the middle mounting seat, through which the upper mounting seat can rotate relative to the middle mounting seat;

[0010] Two groups of lower spring assemblies are installed between the middle mounting seat and the lower mounting seat, and the middle mounting seat can be rotated relative to the lower mounting seat through the lower spring assemblies.

[0011] Furthermore, the upper spring assembly is composed of two upper springs arranged crosswise and symmetrically, and the lower spring assembly is composed of two lower springs arranged crosswise and symmetrically.

[0012] Furthermore, a first adjustment pad is provided at the installation interval between the upper mounting seat and the middle mounting seat, and a second adjustment pad is provided at the installation interval between the middle mounting seat and the lower mounting seat.

[0013] Furthermore, the upper mounting seat, the middle mounting seat and the lower mounting seat each have a plurality of circular holes and a plurality of threaded holes, and the upper mounting seat and the middle mounting seat, as well as the middle mounting seat and the lower mounting seat are all fastened by screws.

[0014] Furthermore, the upper mounting seat and the middle mounting seat form a first axis after being installed, and the lower mounting seat and the middle mounting seat form a second axis after being installed, and the first axis and the second axis are coplanar and orthogonal.

[0015] The present invention provides a method for manufacturing a micro-sized cross-spring flexible hinge, which comprises the following steps:

[0016] Step 1: Assemble the upper mounting seat and the middle mounting seat, fill the interval position with two first adjustment pads, and then use screws to fasten the upper mounting seat and the middle mounting seat through the provided round holes and threaded holes;

[0017] Step 2: Use the slow wire cutting method to process the upper spring fixing groove;

[0018] Step 3: Assemble the lower mounting seat and the middle mounting seat, fill the intervals with four second adjustment pads, and then use screws to tighten the lower mounting seat and the middle mounting seat through the provided round holes and threaded holes. During the process, keep the upper mounting seat and the middle mounting seat in the assembled state and cannot be disassembled;

[0019] Step 4: Use the slow wire cutting method to process the lower spring fixing groove;

[0020] Step 5: Keep the upper, middle, and lower mounting bases assembled, apply glue to the upper spring and stick it in the upper spring fixing groove, and apply glue to the lower spring and stick it in the lower spring fixing groove;

[0021] Step 6: After the glue is dry, remove the assembled screws, the first adjustment pad and the second adjustment pad to form a complete flexible hinge.

[0022] Furthermore, in step five, the upper spring and the lower spring may be fixed by screws.

[0023] In the above technical solution, the present invention provides a miniature cross-spring flexible hinge and a manufacturing method thereof, which has the following beneficial effects:

[0024] The present invention discloses a micro-sized cross-spring flexible hinge and its manufacturing method. The springs are processed separately and can be cut from a flat plate. Therefore, the length (L1) of the springs can be arbitrarily controlled, thereby achieving the miniaturization of the entire hinge. The flexible hinge is not only suitable for micro-sized hinges, but also for large-sized hinges.

[0025] The present invention ensures that two axes are perpendicular and coplanar, the axial holes on both sides of a single axis are coaxial and have the same diameter, and the fixing grooves on both sides of a single spring are coplanar through combined processing, thereby ensuring high movement accuracy of the hinge. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0027] Figure 1 A schematic diagram of the assembly of a miniature cross-spring flexible hinge provided by an embodiment of the present invention;

[0028] Figure 2 An exploded view of a miniature cross-spring flexible hinge provided by an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the rotation range control parameters and the cross position parameters of a micro-sized cross-spring flexible hinge provided by an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the geometric parameters of the reeds in a miniature cross-reed flexible hinge and a manufacturing method thereof provided by an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of a cross-spring in a miniature cross-spring flexible hinge and a manufacturing method thereof provided by an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of step 1 of the combined processing of a method for manufacturing a micro-sized cross-spring flexible hinge according to an embodiment of the present invention;

[0033] Figure 7 A schematic diagram of a first adjustment pad in a method for manufacturing a micro-miniature cross-spring flexible hinge provided by an embodiment of the present invention;

[0034] Figure 8 A schematic diagram of the first axis of a miniature cross-spring flexible hinge and a manufacturing method thereof provided in an embodiment of the present invention;

[0035] Figure 9A schematic diagram of an upper spring fixing groove in a method for manufacturing a micro-sized cross spring flexible hinge provided by an embodiment of the present invention;

[0036] Figure 10 A schematic diagram of the assembly process of a micro-miniature cross-spring flexible hinge manufacturing method provided by an embodiment of the present invention;

[0037] Figure 11 A schematic diagram of a second adjustment pad in a method for manufacturing a micro-miniature cross-spring flexible hinge provided by an embodiment of the present invention;

[0038] Figure 12 A schematic diagram of the second axis of a miniature cross-spring flexible hinge and a manufacturing method thereof provided by an embodiment of the present invention;

[0039] Figure 13 A schematic diagram of a lower spring fixing groove in a method for manufacturing a miniature cross-spring flexible hinge provided in an embodiment of the present invention.

[0040] Description of reference numerals:

[0041] 1. Upper mounting seat; 2. Upper spring; 3. Middle mounting seat; 4. Lower spring; 5. Lower mounting seat; 6. First adjustment pad; 7. Second adjustment pad; 8. Round hole; 9. Threaded hole; 10. First axis; 11. Second axis; 12. Upper spring fixing slot; 13. Lower spring fixing slot. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] See also Figures 1 to 13 As shown;

[0044] The present invention provides a miniature cross-spring flexible hinge and a manufacturing method thereof, wherein the flexible hinge comprises:

[0045] An upper mounting seat 1, a middle mounting seat 3, and a lower mounting seat 5 are arranged from top to bottom. An upper spring fixing groove 12 is formed between the upper mounting seat 1 and the middle mounting seat 3, and a lower spring fixing groove 13 is formed between the middle mounting seat 3 and the lower mounting seat 5.

[0046] Two sets of upper spring assemblies installed between the upper mounting seat 1 and the middle mounting seat 3, through which the upper mounting seat 1 can rotate relative to the middle mounting seat 3;

[0047] Two sets of lower spring assemblies are installed between the middle mounting seat 3 and the lower mounting seat 5, and the middle mounting seat 3 can rotate relative to the lower mounting seat 5 through the lower spring assemblies.

[0048] As a further introduction to this embodiment, the upper spring assembly is composed of two upper springs 2 arranged crosswise and symmetrically, and the lower spring assembly is composed of two lower springs 4 arranged crosswise and symmetrically.

[0049] As a further introduction to this embodiment, a first adjustment pad 6 is provided at the installation interval between the upper mounting seat 1 and the middle mounting seat 3 , and a second adjustment pad 7 is provided at the installation interval between the middle mounting seat 3 and the lower mounting seat 5 .

[0050] As a further introduction to this embodiment, the upper mounting seat 1, the middle mounting seat 3 and the lower mounting seat 5 all have multiple circular holes 8 and multiple threaded holes 9, and the upper mounting seat 1 and the middle mounting seat 3, the middle mounting seat 3 and the lower mounting seat 5 are all fastened by screws.

[0051] As a further introduction to this embodiment, the upper mounting seat 1 and the middle mounting seat 3 form a first axis 10 after installation, and the lower mounting seat 5 and the middle mounting seat 3 form a second axis 11 after installation. The first axis 10 and the second axis 11 are coplanar and orthogonal, thus forming a two-axis orthogonal elastic rotation of the upper mounting seat relative to the lower mounting seat.

[0052] like Figure 3 As shown, the rotation range of the two axes of the hinge can be controlled by controlling the structural spacing between the upper mounting seat 1 and the middle mounting seat 3, and the spacing between the lower mounting seat 5 and the middle mounting seat 3.

[0053] In addition to the material, the performance of the reed mainly depends on the geometric parameters, including the thickness T, length L1, width B1, crossing angle α, and intersection position parameter λ of the reed, such as Figure 3 、 Figure 4 As shown, design analysis can be carried out according to actual needs, and the calculation method can be found in public literature. In addition, Figure 4 The two parameters L2 and L3 depend on the actual structural size and space of the mounting base (upper, middle, and lower), and can be designed reasonably. Figure 4 In the example, B2=2×B1+Δ, where Δ means Figure 5 As shown in the figure, the spacing between the two cross springs is designed to ensure that the two springs do not interfere with each other during movement. Generally, it is 0.1 to 0.2 mm. After the spring material and geometric parameters are determined, the spring spacing B0 ( Figure 5 The performance of the flexible hinge can be determined by

[0054] In this embodiment, according to the design analysis, the geometric parameters of the upper spring 2 are as follows: thickness T = 0.1 mm, length L1 = 4 mm, length L2 = 3.607 mm, length L3 = 4.314 mm, width B1 = 1.95 mm, width B2 = 4.1 mm, ΦD = 1.5 mm (one point on each spring), intersection angle α = 45°, intersection position parameter λ = 0.5, interval Δ = 0.2 mm; the geometric parameters of the lower spring 4 are as follows: thickness T = 0.1 mm, length L1 = 4 mm, length L2 = 4.426 mm, length L3 = 9.465 mm, width B1 = 1.95 mm, width B2 = 4.1 mm, ΦD = 1.5 mm (one point on each spring and three points on the other), intersection angle α = 45°, intersection position parameter λ = 0.5, interval Δ = 0.2 mm; the upper and lower springs are made of 12Cr13 stainless steel;

[0055] The upper, middle and lower mounting bases are all made of 7A09 aluminum alloy.

[0056] like Figure 1 As shown, the overall size of the two-dimensional rotating flexible hinge is 29.4mm×20mm×16.9mm (length×width×height) and the weight is 21.3g.

[0057] Figure 4 The φD circular hole in the middle is for storing glue to increase the bonding strength of the reed in the fixing groove. The specific size and number can be designed according to the size of the reed.

[0058] like Figure 1 As shown, the depth of the fixing groove of the upper, middle and lower mounting seat springs is H=B2+r, where r is the radius of the end fillet when the fixing groove is processed; the opening width of the fixing groove is K=T+(0.003~0.006mm).

[0059] The present invention provides a method for manufacturing a micro-sized cross-spring flexible hinge, which comprises the following steps:

[0060] (1) Except for the shaft holes where the first axis 10 and the second axis 11 are located, all the upper spring fixing grooves 12 and the lower spring fixing grooves 13, the rest of the processing steps of the upper, middle and lower mounting seats are completed. Figure 6 and Figure 10 Status shown;

[0061] (2) Combine the upper and middle mounting seats, and fill the interval δ1 position with two first adjustment pads 6 with a thickness of 0.4mm. Then use M2 screws to fasten the upper and middle mounting seats through the round hole 8 and the threaded hole 9. Complete the first axis 10 processing without reversing at one time, and then use 0.05mm wire diameter slow wire cutting to cut the spring fixing groove with a depth of 4.15mm and a width of 0.105mm. Finally, the result is as follows Figure 9 Status shown;

[0062] (3) Keep the upper and middle mounting seats in the combined state, and combine the lower and middle mounting seats, where the interval δ2 position is filled with four second adjustment pads 7 with a thickness of 0.4mm, and use M2 screws to tighten the circular holes 8 and threaded holes 9 of the lower and middle mounting seats. Use a five-axis CNC machine tool to complete the processing of the two symmetrical second axes 11 at one time, ensuring the coaxiality φ0.003mm, the coplanarity of the shaft hole 2 and the shaft hole 1 and the verticality of 0.003mm; use a 0.05mm wire diameter slow wire to cut the spring fixing groove, with a depth of 4.15mm and a width of 0.105mm, to achieve Figure 13 The state shown is shown;

[0063] (4) Keep the upper, middle and lower fixing seats in the assembled state, and apply glue (using epoxy resin two-component adhesive, resistant to high and low temperatures of -40℃ to +90℃) to the upper and lower reeds in turn and stick them in the upper and lower fixing grooves. Leave glue in the reed ΦD glue storage groove to increase the connection reliability, and pay attention to clean up the glue overflowing from the reed fixing groove in time;

[0064] (5) After the glue has dried for 48 hours, remove the combined processing screws and the first adjustment pad 6 and the second adjustment pad 7 to complete the flexible hinge production.

[0065] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A miniature cross-spring flexible hinge, characterized in that: The flexible hinge comprises: An upper mounting seat (1), a middle mounting seat (3), and a lower mounting seat (5) are arranged from top to bottom, an upper spring fixing groove (12) is formed between the upper mounting seat (1) and the middle mounting seat (3), and a lower spring fixing groove (13) is formed between the middle mounting seat (3) and the lower mounting seat (5); Two sets of upper spring leaf assemblies are installed between the upper mounting seat (1) and the middle mounting seat (3), and the upper mounting seat (1) can be rotated relative to the middle mounting seat (3) through the upper spring leaf assemblies; Two groups of lower spring leaf assemblies are installed between the middle mounting seat (3) and the lower mounting seat (5), and the middle mounting seat (3) can rotate relative to the lower mounting seat (5) through the lower spring leaf assemblies.

2. The micro-sized cross-spring flexible hinge according to claim 1, characterized in that: The upper leaf spring assembly is composed of two upper leaf springs (2) arranged in a cross-symmetric manner, and the lower leaf spring assembly is composed of two lower leaf springs (4) arranged in a cross-symmetric manner.

3. The micro-sized cross-spring flexible hinge according to claim 1, characterized in that: A first adjustment pad (6) is provided at the installation interval between the upper mounting seat (1) and the middle mounting seat (3), and a second adjustment pad (7) is provided at the installation interval between the middle mounting seat (3) and the lower mounting seat (5).

4. The micro-sized cross-spring flexible hinge according to claim 1, characterized in that: The upper mounting seat (1), the middle mounting seat (3) and the lower mounting seat (5) all have a plurality of circular holes (8) and a plurality of threaded holes (9); the upper mounting seat (1) and the middle mounting seat (3), as well as the middle mounting seat (3) and the lower mounting seat (5) are all fastened by screws.

5. The micro-sized cross-spring flexible hinge according to claim 1, characterized in that: The upper mounting seat (1) and the middle mounting seat (3) form a first axis (10) after being installed, and the lower mounting seat (5) and the middle mounting seat (3) form a second axis (11) after being installed, and the first axis (10) and the second axis (11) are coplanar and orthogonal.

6. A method for manufacturing a micro-sized cross-spring flexible hinge, characterized in that: The preparation method comprises the following steps: Step 1: Assemble the upper mounting seat (1) and the middle mounting seat (3), wherein the interval position is filled with two first adjustment pads (6), and then use screws to fasten the upper mounting seat (1) and the middle mounting seat (3) through the provided circular holes (8) and threaded holes (9); Step 2: Processing the upper spring fixing groove (12) by using a slow wire cutting method; Step 3: Assemble the lower mounting seat (5) and the middle mounting seat (3), wherein the interval positions are filled with four second adjustment pads (7), and then use screws to fasten the lower mounting seat (5) and the middle mounting seat (3) through the provided circular holes (8) and threaded holes (9), and during the process, keep the upper mounting seat (1) and the middle mounting seat (3) in the combined state and cannot be disassembled; Step 4: Processing the lower spring fixing groove (13) by using a slow wire cutting method; Step 5: Keep the upper mounting seat (1), the middle mounting seat (3) and the lower mounting seat (5) in the assembled state, apply glue to the upper spring (2) and stick it in the upper spring fixing groove (12), and apply glue to the lower spring (4) and stick it in the lower spring fixing groove (13); Step 6: After the glue is dry, remove the assembled screws, the first adjustment pad (6) and the second adjustment pad (7) to form a complete flexible hinge.

7. The method for manufacturing a micro-sized cross-spring flexible hinge according to claim 6, characterized in that: In step five, the upper spring leaf (2) and the lower spring leaf (4) may also be fixed by screws.

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