Liquid ball bearing for welding of ultra-thin-walled parts of a dewar and method for manufacturing thereof

Abstract

The application discloses a liquid ball bearing for welding of a Dewar ultra-thin-wall part and a preparation method thereof, and comprises a bearing base, wherein the bearing base is provided with an arc-shaped bearing matching surface, a plurality of liquid drop limiting areas are formed on the bearing matching surface, and liquid drops are arranged in the liquid drop limiting areas; and a bearing ring, wherein the outer surface of the bearing ring is matched with the bearing matching surface, and the outer surface of the bearing ring is a PDMS super-hydrophobic surface. The application can realize accurate welding by means of water gel surface micro-texture for grabbing of the ultra-thin-wall part and liquid balls for supporting, lubricating and positioning.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser welding, and in particular to a liquid ball bearing for welding of a dewar ultra-thin wall part and a preparation method thereof. BACKGROUND

[0002] Due to the heat conduction rate requirement of the cold finger cylinder, the wall thickness thereof needs to be prepared to be 100-300 microns. In recent years, due to the rapid development of dewar lightening and rapid refrigeration, the wall thickness of the cold finger cylinder even has a trend of developing to below one hundred microns. However, the thin-walled cold finger cylinder and the cold finger base position have very high precision, and it is currently difficult to achieve precise welding.

[0003] At present, the welding methods for thin-walled parts mainly include brazing, contact welding and fusion welding, but it is still difficult to precisely weld the ultra-thin wall part with a wall thickness of about 10 microns. In addition, there are few related papers, patents or reports on laser welding of ultra-thin wall parts with a wall thickness of 10-100 microns.

[0004] Compared with the above traditional processing methods, laser welding has the advantages of small input heat, non-contact, and large cooling rate, and has great potential for processing of ultra-thin wall parts.

[0005] For ultra-thin wall parts, the large heat release of the traditional welding method will cause the material to deform obviously. Although laser welding has the advantages of small input heat, non-contact, and large cooling rate, it is still very challenging for processing of ultra-thin wall parts.

[0006] The ultra-thin wall part has poor ability to maintain its shape during clamping. Due to the influence of gravity or even the pressure of laser welding blowing gas, the ultra-thin wall part will produce a large deflection, which will seriously affect the processing precision of laser welding.

[0007] Although vacuum laser welding can prevent the weld from oxidizing during processing, the distortion of the processed part caused by heat accumulation and the reverse impact force of plasma generated during processing still make the processing precision very poor. SUMMARY

[0008] Therefore, the purpose of the present application is to provide a liquid ball bearing for welding of a dewar ultra-thin wall part.

[0009] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0010] A liquid ball bearing for welding of a dewar ultra-thin wall part, comprising:

[0011] A bearing base having an arc-shaped bearing matching surface, a plurality of liquid drop limiting areas are formed on the bearing matching surface, and liquid drops are arranged in the liquid drop limiting areas.

[0012] A bearing ring, an outer surface of the bearing ring matching the bearing mating surface, the outer surface of the bearing ring forming a PDMS super-hydrophobic surface.

[0013] The liquid ball bearing for welding the ultra-thin wall part of the Dewar, wherein a plurality of hydrogel grabbing pieces are further included, and each inner surface of the hydrogel grabbing pieces has a biomimetic micro-texture.

[0014] The liquid ball bearing for welding the ultra-thin wall part of the Dewar, wherein the biomimetic micro-texture is a regular hexagonal biomimetic micro-texture, and a side length of the regular hexagonal biomimetic micro-texture is 50 microns to 200 microns.

[0015] The liquid ball bearing for welding the ultra-thin wall part of the Dewar, wherein the bearing ring is a PDMS ring, and an outer surface of the PDMS ring is formed by a femtosecond laser with a 80-90% spot overlap rate, 10-50 J / cm 2 The laser energy density scanning presents a porous surface micro-texture.

[0016] The liquid ball bearing for welding the ultra-thin wall part of the Dewar, wherein the bearing ring includes an outer ring and an inner ring connected with the outer ring, the outer ring is a PDMS ring, an outer surface of the PDMS ring presents a porous surface micro-texture, and the inner ring is a hydrogel ring.

[0017] The hydrogel ring is an integrated structure or a split structure.

[0018] The liquid ball bearing for welding the ultra-thin wall part of the Dewar, wherein the inner surface and the outer surface of the hydrogel ring have biomimetic micro-textures, and further, the inner surface and the outer surface of the PDMS ring have cross groove structures with a spacing of 5-50 microns.

[0019] Or the inner surface of the hydrogel ring has a biomimetic micro-texture, the outer surface of the hydrogel ring is mechanically interlocked with the inner surface of the PDMS ring, and further, the outer surface of the PDMS ring has cross groove structures with a spacing of 5-50 microns.

[0020] The liquid ball bearing for welding the ultra-thin wall part of the Dewar, wherein the bearing base includes a base part and a support part, the base part is connected with a lower end of the support part, and an upper surface of the support part forms the bearing mating surface.

[0021] The base part is provided with a conduit in communication with the bearing mating surface.

[0022] The liquid ball bearing for welding the ultra-thin wall part of the Dewar, wherein an image recognition device is further included, the image recognition device captures and analyzes the outline of the liquid droplet, and supplements the liquid droplet when the outline of the liquid droplet decreases.

[0023] The liquid ball bearing for welding of ultra-thin-walled parts of a Dewar, wherein the micro-control liquid supplementing device is configured to send a liquid supplementing instruction to the micro-control liquid supplementing device when the profile of the liquid droplet is reduced, and the micro-control liquid supplementing device is configured to supplement the liquid droplet through a conduit in communication with the bearing mating surface.

[0024] The liquid ball bearing for welding of ultra-thin-walled parts of a Dewar, wherein the bearing base is made of metal.

[0025] The liquid ball bearing for welding of ultra-thin-walled parts of a Dewar, wherein the bearing mating surface comprises a plurality of super-hydrophilic surfaces and a super-hydrophobic surface surrounding each of the super-hydrophilic surfaces, and the super-hydrophilic surfaces form the liquid droplet limiting region.

[0026] The liquid ball bearing for welding of ultra-thin-walled parts of a Dewar, wherein the bearing mating surface comprises a plurality of liquid grooves, and a super-hydrophobic surface is formed on the bearing mating surface, and the liquid grooves form the liquid droplet limiting region.

[0027] A method for preparing a liquid ball bearing for welding of ultra-thin-walled parts of a Dewar, wherein the liquid ball bearing is any one of the above-mentioned liquid ball bearings for welding of ultra-thin-walled parts of a Dewar, and the method comprises:

[0028] providing a bearing base raw material, the upper surface of the bearing base raw material being an arc surface, a super-hydrophobic surface being prepared on the arc surface, and the super-hydrophobic surface being selectively laser etched a second time according to a liquid droplet distribution design to obtain a plurality of super-hydrophilic surfaces surrounded by the super-hydrophobic surface;

[0029] wherein the size of the super-hydrophilic surface region is adjusted according to the material-liquid bead adsorption force of the bearing base raw material and the liquid bead-PDMS interfacial friction force, and the size of the liquid droplet is adjusted according to the size of the super-hydrophilic surface region to maintain the liquid droplet close to a spherical shape.

[0030] A method for preparing a liquid ball bearing for welding of ultra-thin-walled parts of a Dewar, wherein the liquid ball bearing is any one of the above-mentioned liquid ball bearings for welding of ultra-thin-walled parts of a Dewar, and the method comprises:

[0031] providing a bearing base raw material, the upper surface of the bearing base raw material being an arc surface, a plurality of liquid grooves being formed on the arc surface, each of the liquid grooves having at least a side wall arranged obliquely with respect to the tangent direction of the arc surface, and a super-hydrophobic surface being prepared on the arc surface and the side wall.

[0032] A preparation method of a liquid ball bearing for welding of a dewar ultra-thin wall part, wherein the liquid ball bearing is suitable for any one of the above-mentioned liquid ball bearings for welding of a dewar ultra-thin wall part, and the preparation method comprises:

[0033] A bearing base raw material is provided, the upper surface of the bearing base raw material is an arc surface, a plurality of liquid grooves are formed on the arc surface, each of the liquid grooves has a bottom surface and a side wall arranged obliquely relative to the bottom surface, an included angle between the bottom surface and the side wall is obtuse, and a super-hydrophobic surface is prepared on the arc surface, the bottom surface and the side wall.

[0034] The preparation method of the liquid ball bearing for welding of a dewar ultra-thin wall part, wherein the method for preparing the super-hydrophobic surface comprises etching cross grooves on the arc surface of the bearing base raw material.

[0035] The arc surface of the bearing base raw material is ultrasonically cleaned to remove splashed molten material.

[0036] After the arc surface of the bearing base raw material is dried, a super-hydrophobic reagent is sprayed onto the surface etched with the cross grooves until it is stable and solidified, or the arc surface of the bearing base raw material is soaked in the super-hydrophobic reagent and then taken out for baking.

[0037] A preparation method of a liquid ball bearing for welding of a dewar ultra-thin wall part, wherein the liquid ball bearing is suitable for any one of the above-mentioned liquid ball bearings for welding of a dewar ultra-thin wall part, the bearing ring comprises an outer ring and an inner ring connected to the outer ring, the outer ring is a PDMS ring, and the inner ring is a hydrogel ring.

[0038] The preparation method comprises:

[0039] The outer surface of the hydrogel ring and the inner surface of the PDMS ring are etched with protrusion structures and groove structures of the same size, respectively, so that the outer surface of the hydrogel ring and the inner surface of the PDMS ring are mechanically interlocked.

[0040] The present application has the following positive effects compared with the prior art due to the use of the above-mentioned technology:

[0041] (1) The present application can grasp, position and accurately weld the ultra-thin wall part through the micro-texture on the surface of the hydrogel.

[0042] (2) The present application can realize the bearing of objects of different masses by adjusting the interface, the geometry of the micro-texture, the volume and shape of the liquid droplets.

[0043] (3) The solid-liquid interface friction mode of the present application is rolling friction, which greatly improves the lubrication performance of the interface and reduces the hysteresis of transmission control caused by friction. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the liquid ball bearing for welding ultra-thin wall components of the present invention.

[0045] Figure 2 This is a schematic diagram of the interlocking structure of the DPMS ring and hydrogel ring of the liquid ball bearing used for welding ultra-thin wall components of the present invention.

[0046] Figure 3 This is a schematic diagram of the droplet rolling of the liquid ball bearing used for welding ultra-thin wall components of the present invention.

[0047] Figure 4 This is a schematic diagram of the liquid droplet replenishment in the liquid ball bearing for welding ultra-thin wall components of the present invention.

[0048] Figure 5 This is a schematic diagram of the liquid droplet replenishment in the liquid ball bearing for welding ultra-thin wall components of the present invention.

[0049] Figure 6 and Figure 7 This is a schematic diagram of the liquid droplet in the liquid ball bearing for welding ultra-thin wall components of the present invention.

[0050] In the attached diagram: 1. Bearing base; 11. Base part; 12. Support part; 13. Liquid tank; 2. Bearing ring; 21. PDMS ring; 22. Hydrogel ring; 3. Hydrogel gripping sheet. Detailed Implementation

[0051] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] In the description of this invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "lateral", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention.

[0053] It should be noted that the terms "horizontal" and "vertical" in this invention are used to describe approximate positional relationships, and not strictly "horizontal plane" or "vertical plane".

[0054] Please see Figures 1 to 7The image shows a preferred embodiment of a liquid ball bearing for welding ultrathin wall components of a Dewar, comprising: a bearing base 1 and a bearing ring 2. The bearing base 1 has an arc-shaped bearing mating surface, and a plurality of droplet limiting regions are formed on the bearing mating surface. Droplets are arranged in the droplet limiting regions. The outer surface of the bearing ring 2 matches the bearing mating surface, and the outer surface of the bearing ring 2 forms a PDMS superhydrophobic surface.

[0055] The bearing base 1 supports the bearing ring 2, and a bearing interface is formed between the bearing base 1 and the bearing ring 2. The bearing ring 2 supports the free end of the ultra-thin wall component, preventing deflection of the free end of the ultra-thin wall component due to gravity.

[0056] Furthermore, as a preferred embodiment, the liquid ball bearing for welding Dewar ultrathin wall components also includes: a plurality of hydrogel grippers 3, each hydrogel gripper 3 having a biomimetic microtexture on its inner surface.

[0057] Since ultra-thin wall components cannot be fixed by a three-grip chuck or similar compression clamping method, this invention uses hydrogel gripping sheets to adsorb and fix ultra-thin wall components.

[0058] Preferably, it includes three hydrogel gripping sheets 3, which together form a ring or are approximately ring-shaped.

[0059] Specifically, each hydrogel gripping sheet 3 has a 1 / 3 ring structure.

[0060] It should be noted that the term "ring" in this invention does not strictly refer to a closed ring structure, but rather to a structure that forms a ring-like shape. For example, the ends of the three hydrogel gripping pieces 3 mentioned above can be connected to each other or have gaps between them.

[0061] Because hydrogel is a flexible material, it can perfectly fit ultra-thin walled parts without causing deformation of the object being grasped.

[0062] Furthermore, as a preferred embodiment, the biomimetic microtexture is a regular hexagonal biomimetic microtexture with a side length of 50 micrometers to 200 micrometers.

[0063] Specifically, the adsorption function of the hydrogel gripping sheet 3 depends on the hexagonal biomimetic microtexture on its surface.

[0064] More specifically, the hexagonal biomimetic microtexture is constructed using an ultrafast laser with a wavelength below 355 nm, achieving an 80-90% spot overlap rate and a speed of 20-50 J / cm². 2 Laser energy density is used for etching to create microtextures with side lengths ranging from 50 micrometers to 200 micrometers.

[0065] Furthermore, as a preferred embodiment, both the inner and outer surfaces of the hydrogel gripper 3 are formed with biomimetic microtextures. The inner surface of the hydrogel gripper 3 adsorbs ultrathin-walled parts, and the outer surface of the hydrogel gripper 3 adsorbs a rotational power device to drive / control the rotational processing of the hydrogel and the ultrathin-walled parts.

[0066] Furthermore, as a preferred embodiment, the bearing ring 2 is a PDMS ring, and the outer surface of the PDMS ring forms a porous surface microtexture.

[0067] Specifically, the thickness of the PDMS ring is 0.1-0.2 mm, and the elastic modulus of the PDMS ring is between 1-10 MPa, providing sufficient stiffness to maintain the circular shape.

[0068] Specifically, the surface of the PDMS ring is scanned by a picosecond or femtosecond laser with a wavelength of less than 532nm to obtain a porous surface microtexture.

[0069] Specifically, combined with the low surface energy of PDMS, the microtextured surface of PDMS exhibits superhydrophobic properties with a contact angle of 120°-155°.

[0070] Furthermore, as a preferred embodiment, the bearing ring 2 includes an outer ring and an inner ring connected to the outer ring, wherein the outer ring is a PDMS ring 21, the outer surface of the PDMS ring 21 is formed with a porous surface microtexture, and the inner ring is a hydrogel ring 22, the inner surface of the hydrogel ring 22 is a regular hexagonal biomimetic microtexture.

[0071] Furthermore, as a preferred embodiment, the hydrogel ring 22 is either an integral structure or a split structure.

[0072] Preferably, it includes three hydrogel rings 22, each of which has a 1 / 3 ring structure.

[0073] Furthermore, as a preferred embodiment, both the inner and outer surfaces of the hydrogel ring 22 have biomimetic microtextures, which are used to grasp the PDMS ring and the workpiece.

[0074] Furthermore, as another preferred embodiment, the inner surface of the hydrogel ring 22 has a biomimetic microtexture, and the outer surface of the hydrogel ring 22 is mechanically interlocked with the inner surface of the PDMS ring 21. The biomimetic microtexture on the inner surface of the hydrogel ring 22 is used to grip the workpiece. The outer surface of the hydrogel ring 22 and the inner surface of the PDMS ring have inverted conical structures of the same size to achieve mechanical interlocking, thereby achieving synchronous rotation.

[0075] Preferably, the size of the inverted cone structure is 20 micrometers to 50 micrometers.

[0076] It should be noted that if the static friction between the workpiece and the PDMS ring is sufficient to drive the PDMS to rotate synchronously, the PDMS ring can directly contact the workpiece. This is the technical solution of selecting bearing ring 2 as the PDMS ring.

[0077] If the static friction between the workpiece and the PDMS ring is insufficient to drive the PDMS to rotate synchronously, then a solution using an outer PDMS ring and an inner hydrogel ring should be selected.

[0078] Furthermore, in a preferred embodiment, the bearing base 1 includes a base portion 11 and a support portion 12, the base portion 11 being connected to the lower end of the support portion 12, and the upper surface of the support portion 12 forming a bearing mating surface.

[0079] Furthermore, in a preferred embodiment, the base portion 11 is provided with a conduit that communicates with the bearing mating surface. The conduit replenishes the droplet volume to ensure sufficient support and lubrication during processing.

[0080] Furthermore, as a preferred embodiment, it also includes: an image recognition device that captures and analyzes the outline of the droplet, and replenishes the droplet when the outline of the droplet decreases.

[0081] Furthermore, as a preferred embodiment, it also includes: a micro-controlled liquid replenishment device, wherein the image recognition device captures and analyzes the outline of the droplet, and when the outline of the droplet decreases, it sends a replenishment command to the micro-controlled liquid replenishment device, and the micro-controlled liquid replenishment device replenishes the droplet through a conduit connected to the bearing mating surface.

[0082] In other embodiments, the droplet volume can also be manually replenished using a pipette.

[0083] Furthermore, as a preferred embodiment, the bearing base 1 is made of metal.

[0084] Furthermore, as a preferred embodiment, the bearing base 1 is made of copper. This allows for rapid heat conduction and dissipation of the welding heat through the combination of hydrogel and liquid droplets.

[0085] There are two types of bearing bases 1. The first type constrains the water droplets through a hydrophilic-hydrophobic interface, while the second type controls the droplet displacement through an inverted conical geometric structure.

[0086] Furthermore, as a preferred embodiment, the bearing mating surface includes a plurality of superhydrophilic surfaces and a superhydrophobic surface surrounding each superhydrophilic surface, wherein the superhydrophilic surface forms a droplet confinement region.

[0087] Furthermore, in a preferred embodiment, the bearing mating surface includes a plurality of liquid grooves 13, and the bearing mating surface is a superhydrophobic surface, wherein the liquid grooves 13 form a droplet limiting area.

[0088] The present invention also provides a method for preparing a liquid ball bearing for welding ultrathin wall components of Dewar, wherein the preparation method includes: providing a bearing base material, the upper surface of the bearing base material being an arc-shaped surface, preparing a superhydrophobic surface on the arc-shaped surface, and performing secondary etching on the superhydrophobic surface to obtain multiple superhydrophilic surfaces surrounded by the superhydrophobic surface.

[0089] The size of the superhydrophilic surface area is adjusted according to the material of the bearing base material - the adsorption force of the liquid droplet and the frictional force of the liquid droplet-PDMS interface. The size of the droplet is adjusted according to the size of the superhydrophilic surface area to keep the droplet close to a spherical shape.

[0090] Specifically, the diameter of the superhydrophilic surface region is 5 micrometers to 50 micrometers.

[0091] Specifically, the droplet size is controlled according to the "adsorption force between the hydrophilic surface and the water droplet" and the "interfacial friction between the water droplet and the PDMS". The droplet size is simultaneously controlled according to the size of the superhydrophilic surface area, ranging from 2.5 to 25 microliters, to keep the droplets close to spherical and provide good lubrication and support.

[0092] The present invention also provides a method for preparing a liquid ball bearing for welding ultrathin wall components of Dewar, wherein the preparation method includes: providing a bearing base material, the upper surface of the bearing base material being an arc-shaped surface, forming a plurality of liquid grooves 13 on the arc-shaped surface, each liquid groove 13 having at least a sidewall arranged obliquely relative to the tangential direction of the arc-shaped surface, and preparing a superhydrophobic surface on the arc-shaped surface and the sidewall.

[0093] In this embodiment, the liquid tank 13 is an inverted conical tank.

[0094] Specifically, a superhydrophobic surface is prepared by drilling an inverted conical groove on the arc-shaped surface of the bearing base material using a CNC machine tool.

[0095] More specifically, in this embodiment, an appropriate amount of fluorescent particles with a size of less than 5 micrometers are added to the droplets. During the processing, through fluorescence irradiation and high-speed camera imaging, it was found that the droplets undergo rolling friction in the inverted conical groove.

[0096] Therefore, curved surfaces with inverted conical grooves and superhydrophobic surfaces can provide better lubrication conditions.

[0097] Furthermore, the device in this embodiment makes it easier to control the size of the droplets, as long as the tip of the droplet is higher than the inverted conical groove and can make good contact with and support the PDMS.

[0098] Furthermore, as a preferred embodiment, preferably, two rows of liquid droplets are arranged on the bearing base 1.

[0099] Specifically, two rows of droplets can support stainless steel with a wall thickness of 50 micrometers and a length of less than 500 mm (PDMS thickness is 100 micrometers). Supporting objects of greater mass can also be achieved by increasing the PDMS area, increasing the number of droplets, changing the shape (by altering the shape of hydrophilic / hydrophobic regions and inverted conical regions), or even changing the liquid material (mercury has greater surface tension).

[0100] The present invention also provides a method for preparing a liquid ball bearing for welding ultrathin wall components of Dewar, wherein the preparation method includes: providing a bearing base material, the upper surface of the bearing base material being an arc-shaped surface, forming a plurality of liquid grooves 13 on the arc-shaped surface, each liquid groove 13 having a bottom surface and a side wall arranged obliquely relative to the bottom surface, wherein the included angle between the bottom surface and the side wall is an obtuse angle, and preparing a superhydrophobic surface on the arc-shaped surface, the bottom surface and the side wall.

[0101] In this embodiment, the liquid tank 13 is a flat-bottomed tank.

[0102] The present invention also provides a method for preparing a superhydrophobic surface, comprising: etching cross grooves on the arc-shaped surface of a bearing base material; ultrasonically cleaning the arc-shaped surface of the bearing base material to remove splashed molten material; after the arc-shaped surface of the bearing base material is air-dried, spraying a superhydrophobic reagent onto the surface with the etched cross grooves until it is solidified and stable, or immersing the arc-shaped surface of the bearing base material in the superhydrophobic reagent and then taking it out and baking it.

[0103] Specifically, because copper has a high reflectivity to visible light, i.e., longer wavelengths, cross-shaped grooves are etched onto the copper surface using wavelengths below 355nm.

[0104] The present invention also provides a method for preparing a liquid ball bearing for welding ultrathin-walled components of a Dewar flask. The bearing ring of the liquid ball bearing for welding ultrathin-walled components of a Dewar flask includes an outer ring and an inner ring connected to the outer ring, wherein the outer ring is a PDMS ring 21 and the inner ring is a hydrogel ring 22; wherein the preparation method includes etching protrusion structures and groove structures of the same size on the outer surface of the hydrogel ring 22 and the inner surface of the PDMS ring 21, respectively, so that the outer surface of the hydrogel ring 22 and the inner surface of the PDMS ring 21 are mechanically interlocked.

[0105] Specifically, a raised structure is formed on the outer surface of the hydrogel ring 22 and a groove structure is formed on the inner surface of the PDMS ring 21;

[0106] Alternatively, a groove structure may be formed on the outer surface of the hydrogel ring 22 and a protrusion structure may be formed on the inner surface of the PDMS ring 21;

[0107] Alternatively, groove structures and protrusion structures may be formed on both the outer surface of the hydrogel ring 22 and the inner surface of the PDMS ring 21, and the two are arranged correspondingly to achieve mechanical interlocking.

[0108] Preferably, the raised structure is inverted conical in shape, and the groove structure matches the raised structure.

[0109] The present invention also provides a liquid ball bearing device for welding ultrathin-walled Dewar components, comprising a plurality of liquid ball bearings for welding ultrathin-walled Dewar components, particularly two liquid ball bearings for welding ultrathin-walled Dewar components.

[0110] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A liquid ball bearing for welding ultra-thin wall components in Dewar, characterized in that, include: A bearing base having an arc-shaped bearing mating surface, wherein multiple droplet limiting areas are formed on the bearing mating surface, and droplets are arranged in the droplet limiting areas; The bearing ring has an outer surface that matches the bearing mating surface, and the outer surface of the bearing ring is a PDMS superhydrophobic surface. It also includes: multiple hydrogel gripping sheets, each of which has a biomimetic microtexture on its inner surface; It also includes: an image recognition device that captures and analyzes the outline of the droplet, and replenishes the droplet when the outline of the droplet decreases; It also includes: a micro-controlled liquid replenishment device, wherein the image recognition device captures and analyzes the outline of the droplet, and sends a replenishment command to the micro-controlled liquid replenishment device when the outline of the droplet decreases, and the micro-controlled liquid replenishment device replenishes the droplet through a conduit connected to the bearing mating surface; The bearing mating surface includes multiple liquid grooves, and a superhydrophobic surface is formed on the bearing mating surface, wherein the liquid grooves form the droplet limiting area.

2. The liquid ball bearing for welding ultra-thin wall components of Dewar according to claim 1, characterized in that, The biomimetic microtexture is a regular hexagonal biomimetic microtexture with a side length of 50 micrometers to 200 micrometers.

3. The liquid ball bearing for welding ultra-thin wall components of Dewar according to claim 1, characterized in that, The bearing ring is a PDMS ring, and the outer surface of the PDMS ring has a porous surface microtexture.

4. The liquid ball bearing for welding ultra-thin wall components of Dewar according to claim 1, characterized in that, The bearing ring includes an outer ring and an inner ring connected to the outer ring, wherein the outer ring is a PDMS ring and the outer surface of the PDMS ring forms a porous surface microtexture, and the inner ring is a hydrogel ring; The hydrogel ring can be a one-piece structure or a split structure.

5. The liquid ball bearing for welding ultra-thin wall components of Dewar according to claim 4, characterized in that, Both the inner and outer surfaces of the hydrogel ring have biomimetic microtextures; Alternatively, the inner surface of the hydrogel ring may have a biomimetic microtexture, and the outer surface of the hydrogel ring may be mechanically interlocked with the inner surface of the PDMS ring.

6. The liquid ball bearing for welding ultra-thin wall components of Dewar according to claim 1, characterized in that, The bearing base includes a base portion and a support portion, the base portion is connected to the lower end of the support portion, and the upper surface of the support portion forms the bearing mating surface; The base portion is provided with a conduit that communicates with the bearing mating surface.

7. The liquid ball bearing for welding ultra-thin wall components of Dewar according to claim 1, characterized in that, The bearing base is made of metal.

8. A method for preparing a liquid ball bearing for welding ultrathin-walled components of a Dewar flask, characterized in that, The liquid ball bearing for welding ultrathin-walled components of Dewar as described in any one of claims 1 to 7, wherein the preparation method comprises: A bearing base material is provided, the upper surface of which is an arc-shaped surface, and a plurality of liquid grooves are formed on the arc-shaped surface. Each of the liquid grooves has at least a sidewall that is inclined relative to the tangential direction of the arc-shaped surface. A superhydrophobic surface is prepared on the arc-shaped surface and the sidewall.

9. The method for preparing a liquid ball bearing for welding ultrathin-walled parts of a Dewar according to claim 8, characterized in that, A method for preparing a superhydrophobic surface includes etching cross grooves on the arc-shaped surface of the bearing base material; The arc-shaped surface of the bearing base material is ultrasonically cleaned to remove splashed molten material; After the arc-shaped surface of the bearing base material is air-dried, the superhydrophobic reagent is sprayed onto the surface with the etched cross grooves until it is cured and stable, or the arc-shaped surface of the bearing base material is immersed in the superhydrophobic reagent and then taken out and baked.

10. A method for preparing a liquid ball bearing for welding ultrathin-walled components of a Dewar flask, characterized in that, The liquid ball bearing for welding ultrathin-walled components of Dewar as described in any one of claims 1 to 7, wherein the bearing ring comprises an outer ring and an inner ring connected to the outer ring, wherein the outer ring is a PDMS ring and the inner ring is a hydrogel ring; The preparation method includes: The outer surface of the hydrogel ring and the inner surface of the PDMS ring are respectively etched with protrusions and grooves of the same size to mechanically interlock the outer surface of the hydrogel ring with the inner surface of the PDMS ring.

Images