A processing method of a momentum wheel thin-wall sealing cover

Abstract

The application relates to a processing method of a momentum wheel thin-wall sealing cover, which comprises the following steps: 1, rough machining is performed on the outer circular sidewall of a part blank, a process handle and a process handle sidewall; 2, a self-adaptive sidewall damping tool is installed on a general hydraulic chuck, the process handle end of the part is clamped, and the right end of the part is in elastic contact with the self-adaptive sidewall damping tool; a self-adaptive circular damping tool is sleeved on the outer circle of the part; the inner hole of the part is precisely machined; 3, the self-adaptive circular damping tool is removed, a gas bag part of a gas bag auxiliary support is inserted into the inner hole of the part, and the gas bag is inflated to be in contact with the inner hole wall of the part; then the center position of the right end rigid part of the gas bag auxiliary support is pressed by a built-in tail center of a machine tool tailstock; the outer circle of the part is precisely machined to the design size; 4, the outer circular sidewall of the part is precisely machined, and the process handle is removed. The application can realize a better machining damping effect.

Description

Technical Field

[0001] This invention belongs to the field of precision machining technology, and specifically relates to a machining method for a momentum wheel thin-walled sealing cover. Background Technology

[0002] The momentum wheel, also known as a flywheel, has a core component called the sealing cover, which is a typical low-rigidity, multi-curved aluminum alloy structure, making it difficult to machine. Due to its structural limitations, the sealing cover has a wall thickness of only 1mm, while its diameter reaches ø260mm. This causes strong self-excited vibration (chatter) to easily occur at the contact point between the part and the tool under dynamic cutting forces, leaving chatter marks on the part surface and seriously affecting machining efficiency and surface accuracy.

[0003] Figure 1 The diagram shows a schematic of a momentum wheel sealing cover. This part is made of aluminum alloy, has a large diameter, thin wall thickness, and many curved surfaces. The following problems exist in its processing:

[0004] 1. The part is a typical large, multi-curved, thin-walled part. The left end is a thin-walled hole, and the right end is a curved surface. There are no stress points or positioning surfaces, which makes clamping difficult.

[0005] 2. The parts have low rigidity, resulting in severe chatter during machining, making it impossible to use large cutting parameters and leading to low machining efficiency;

[0006] To solve the problem of chatter during machining, methods such as using modeling clay or soft belts are often used for vibration reduction. However, these methods are cumbersome, require a long time to operate, and have poor vibration reduction effects. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention proposes a method for processing a thin-walled sealing cover for a momentum wheel.

[0008] The above-mentioned objective of this invention is achieved through the following technical solution:

[0009] A method for machining a thin-walled sealing cover for a momentum wheel, which requires adding a process shank as an auxiliary clamping part to the right arc end face of the part blank. The method employs an internal hole support fixture, an adaptive sidewall vibration damping fixture, an adaptive circumferential vibration damping fixture, and an airbag-type auxiliary support during machining, and includes the following machining steps:

[0010] Step 1: Use a general-purpose fixture to clamp the inner hole end of the part blank, and set an inner hole support fixture in the inner hole of the part blank. The inner hole support fixture is a disc-shaped rigid fixture. Roughly machine the outer circular side wall, process shank and process shank side wall of the part blank.

[0011] Step 2: Install the assembled adaptive sidewall vibration damping fixture onto the general hydraulic chuck, clamp and fix the process shank end of the part, and make the right end of the part elastically contact the adaptive sidewall vibration damping fixture; then, fit the adaptive circumferential vibration damping fixture onto the outer circle of the part; then, perform precision machining on the inner hole of the part.

[0012] Step 3: Remove the adaptive circumferential vibration damping fixture, insert the airbag part of the airbag auxiliary support into the inner hole of the part, and inflate it until the airbag contacts the inner hole wall of the part; then press the center position of the right end rigid part of the airbag auxiliary support with the tailstock built-in tail point of the machine tool; then perform precision machining on the outer circle of the part to achieve the design dimensions.

[0013] Step 4: Remove the adaptive sidewall vibration damping fixture and airbag auxiliary support. Use a general-purpose fixture to clamp the inner hole end of the part and set an inner hole support fixture in the inner hole of the part. Then, finish machine the outer circular sidewall of the part and remove the process shank to complete the finishing of the part.

[0014] Furthermore, the adaptive sidewall vibration damping fixture consists of a vibration damping module and a clamping module; the vibration damping module is in three groups and is assembled into a complete circular structure along the circumferential direction; the clamping module uses part locking claws, and there are three part locking claws, which are assembled into a complete circular structure along the circumferential direction.

[0015] Furthermore, the vibration damping module consists of a fan-shaped vibration damping housing, spring supports, springs, spring sleeves, a fan-shaped cover plate, and a contour-adaptive silicone body. The fan-shaped vibration damping housing has an overall fan-shaped block structure. Two fan-shaped groove areas are provided circumferentially on the front side of the fan-shaped vibration damping housing. Multiple spring support locking threaded holes are evenly distributed on the bottom surface of the two fan-shaped groove areas. Three tensioning through holes are provided axially on the fan-shaped vibration damping housing between the two fan-shaped groove areas. These holes are fixed to a universal hydraulic chuck by through bolts and matching standard T-blocks. A toothed boss is provided on the back end of the fan-shaped vibration damping housing corresponding to the three tensioning through holes. This boss is positioned and engaged with the toothed boss on the universal hydraulic chuck. Multiple threaded holes are provided on the front end of the fan-shaped vibration damping housing around the two fan-shaped groove areas.

[0016] The spring support consists of a left-end tension threaded section and a right-end positioning cylinder. The left-end tension threaded section engages with the spring support locking threaded hole on the sector-shaped housing; the right-end positioning cylinder engages with the spring sleeve.

[0017] The spring sleeve is a stepped cylindrical sleeve with the outer diameter of the cylinder at the left end being larger than that at the right end. The inner hole at the left end fits with the positioning cylinder at the right end of the spring support and contacts the right end of the spring through its left end.

[0018] The conformal adaptive silicone body has a fan-shaped block structure. Its front side is provided with a conformal groove that matches the shape of the right end of the part, and its back side is fixedly connected to the right end of the spring sleeve by screws.

[0019] Multiple screw through holes are provided around the outline of the sector-shaped cover plate, which are aligned with multiple threaded holes on the front end of the sector-shaped vibration damping housing. By installing screws, it is tightened and fixed to the sector-shaped vibration damping housing. A through hole is provided on the sector-shaped cover plate at the position corresponding to the locking threaded hole of each spring support, so that the right end positioning cylinder of the spring sleeve can protrude.

[0020] Furthermore, the back of the fan-shaped cover plate is provided with four rounded protrusions, which are positioned and matched with the rounded corners of the outer grooves of the two fan-shaped groove areas on the shock-absorbing housing.

[0021] Furthermore, the locking claw of the part has a fan-shaped columnar structure, with a fan-shaped notch at its right end. The outer circular surface and bottom surface of the fan-shaped notch are the clamping surface and limiting surface of the part, respectively. An axial locking through hole is provided on the locking claw of the part around the fan-shaped notch. The part is tightened and fixed on the universal hydraulic chuck by bolts and matching T-blocks inserted into the locking through hole. A toothed boss is provided on the left end of the locking claw of the part, which is positioned and engaged with the toothed boss on the universal hydraulic chuck.

[0022] Furthermore, the airbag-type auxiliary support consists of an annular airbag located at the left end and an auxiliary support plate located at the right end; the annular airbag and the auxiliary support plate are coaxially bonded and fixed; the auxiliary support plate consists of two parts: a positioning disc and a limiting disc arranged on the left and right sides; wherein the diameter of the positioning disc matches the inner diameter of the part, and the positioning disc mates with the inner hole of the part; the end face adjacent to the positioning disc is the limiting end face, and the limiting end face fits against the end face of the part; the diameter of the limiting disc is greater than or equal to the outer diameter of the part; a central conical hole is provided at the right end of the auxiliary support plate for mates with the tip conical surface; and an inflation / deflation hole is provided on the auxiliary support plate, which communicates with the air inlet and outlet ports on the airbag.

[0023] Furthermore, the inner diameter of the adaptive circumferential vibration damping fixture matches the outer diameter of the part; the adaptive circumferential vibration damping fixture consists of two semi-circular rings, which are connected at one end by a hinge structure and at the other end by a folding buckle; a silicone layer is bonded to the inner side of the two semi-circular rings, and the silicone layer contacts the outer surface of the part.

[0024] The advantages and positive effects of this invention are as follows:

[0025] 1. The end-face vibration reduction method of the present invention adopts an elastic telescopic sleeve consisting of a spring support, a spring and a spring sleeve, in conjunction with a soft silicone material conforming to the end face of the part. It can be applied to curved surfaces with different curvatures, has strong versatility, good adaptability to curved surface contours, and obvious vibration reduction effect.

[0026] 2. The outer circle vibration reduction method of the present invention adopts a movable hinge in conjunction with soft silicone to contact the outer circle of the part. At the same time, the hinge has a self-locking function, which makes the contact with the part safe and reliable, and the vibration reduction effect is obvious.

[0027] 3. The vibration damping part and the clamping part of the present invention are designed separately. They are positioned with the chuck by end face teeth and locked with screws. The clamping and vibration damping stroke can be adjusted radially, with high degree of freedom and strong adaptability.

[0028] 4. This invention reduces vibration during the machining of thin-walled curved surfaces by adding a process handle and using an internal support and auxiliary clamping method, thus solving the problem of vibration reduction during clamping of thin-walled multi-curved parts. Attached Figure Description

[0029] Figure 1 These are structural and dimensional drawings of the machined parts involved in this invention;

[0030] Figure 2 This is a structural diagram of the adaptive sidewall vibration reduction fixture of the present invention;

[0031] Figure 3 This is a front view of the fan-shaped vibration damping shell in the adaptive sidewall vibration damping fixture of the present invention;

[0032] Figure 4 This is a schematic diagram of the back of the fan-shaped vibration damping housing in the adaptive sidewall vibration damping fixture of the present invention;

[0033] Figure 5 This is a schematic diagram of the fan-shaped cover plate in the adaptive sidewall vibration damping fixture of the present invention;

[0034] Figure 6 This is a schematic diagram of the spring support column in the adaptive sidewall vibration damping fixture of the present invention;

[0035] Figure 7 This is a schematic diagram of the spring sleeve in the adaptive sidewall vibration damping fixture of the present invention;

[0036] Figure 8 This is a front view of the locking claw of the part in the adaptive sidewall vibration damping fixture of the present invention;

[0037] Figure 9 This is a schematic diagram of the back of the locking claw of the part in the adaptive sidewall vibration damping fixture of the present invention;

[0038] Figure 10 This is a schematic diagram of the conformal adaptive silicone body in the adaptive sidewall vibration damping fixture of the present invention;

[0039] Figure 11 This is a side view of the airbag-type auxiliary support of the present invention;

[0040] Figure 12 This is a perspective view of the airbag-type auxiliary support of the present invention;

[0041] Figure 13 This is a schematic diagram of the adaptive circumferential vibration damping tool of the present invention;

[0042] Figure 14 This is a schematic diagram of the structure of the present invention, which uses ordinary tooling to perform rough machining on parts;

[0043] Figure 15 This is a diagram illustrating the assembly process of the adaptive sidewall vibration damping fixture of the present invention;

[0044] Figure 16 This is a schematic diagram of the structure of the present invention, which fixes the adaptive sidewall vibration damping fixture on a general hydraulic chuck;

[0045] Figure 17 This is a detailed drawing of how the adaptive sidewall vibration damping fixture of this invention clamps the process handle of the part.

[0046] Figure 18 This is an overall view of the invention using an adaptive sidewall vibration damping fixture to clamp and fix the parts;

[0047] Figure 19 This is a schematic diagram of the structure of the adaptive circumferential vibration damping fixture used to lock the outer circle of the part in this invention;

[0048] Figure 20 This is a reference drawing for the precision machining of the inner hole of the part according to the present invention;

[0049] Figure 21 This is a reference diagram of the present invention, which uses adaptive sidewall vibration damping fixture, airbag auxiliary support and machine tool tailstock built-in tail point to position, clamp and remove parts for finishing of the outer circle.

[0050] Figure 22 This is a reference diagram of the present invention, which uses ordinary tooling parts for positioning, clamping, and removing the process handle. Detailed Implementation

[0051] The structure of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0052] For a method of fabricating a momentum wheel thin-walled sealing cover, please refer to [link / reference]. Figures 1-22The invention features the following: a process shank is added to the right-end arc face of the workpiece blank as an auxiliary clamping point. During machining, an internal hole support fixture, an adaptive sidewall vibration damping fixture, an adaptive circumferential vibration damping fixture, and an airbag-type auxiliary support are employed. The roughing internal hole auxiliary support is used to provide auxiliary support for the internal hole of the workpiece during rough machining, preventing clamping and machining deformation. The adaptive sidewall vibration damping fixture forms a positioning clamping engagement with the process shank of the workpiece during finishing internal hole machining, and simultaneously forms a form-shaped elastic contact with the rear end of the workpiece. The adaptive circumferential vibration damping fixture forms an elastic clamping engagement with the outer circle of the workpiece during finishing internal hole machining. The airbag-type auxiliary support forms an elastic support engagement with the internal hole of the workpiece during finishing outer circular surface machining.

[0053] The adaptive sidewall vibration damping fixture mainly consists of a vibration damping module and a clamping module. The vibration damping module comprises a fan-shaped vibration damping housing 1, a spring support 6, a spring 12, a spring sleeve 3, a fan-shaped cover plate 2, and a contour-following adaptive silicone body 4. In this invention, the vibration damping module consists of three sets, assembled into a complete circular structure along the circumference. The clamping module uses part locking claws 5; in this invention, there are three part locking claws, assembled into a complete circular structure along the circumference. The vibration damping module primarily functions by using silicone as the contact medium and springs as the vibration damping support when machining the inner hole end of a part, thus offsetting the vibrations caused by insufficient rigidity of the part during machining the inner hole sidewall and the inner hole itself, and providing vibration damping.

[0054] The fan-shaped vibration damping housing has an overall fan-shaped block structure. Two fan-shaped groove areas 1.1 are provided circumferentially on the front side of the housing. Multiple spring support locking threaded holes 1.2 are evenly distributed on the bottom surface of the two fan-shaped groove areas for fixing the spring supports. Three tensioning through holes 1.3 are provided axially between the two fan-shaped groove areas on the fan-shaped vibration damping housing, which can be used with bolts and standard T-blocks to fix it to a universal hydraulic chuck. A toothed boss 1.5 is provided on the back end of the fan-shaped vibration damping housing corresponding to the three tensioning through holes. This boss can cooperate with the toothed boss on the universal hydraulic chuck to form a self-positioning mechanism, improving positioning accuracy after disassembly. Additionally, multiple threaded holes 1.4 are provided on the front end of the fan-shaped vibration damping housing around the two fan-shaped groove areas for fixing the fan-shaped cover plate.

[0055] The back of the fan-shaped cover plate has four rounded protrusions 2.1, which can mate with the rounded corners of the outer grooves of the two fan-shaped recesses on the shock absorber housing, restricting their degree of freedom. The back of the fan-shaped cover plate is the positioning surface that contacts the front of the fan-shaped shock absorber housing. Multiple screw through holes 2.3 are provided around the perimeter of the fan-shaped cover plate, aligning with multiple threaded holes on the front end of the fan-shaped shock absorber housing, allowing screws to be used to tighten and fix it to the fan-shaped shock absorber housing. A through hole 2.2 is provided on the fan-shaped cover plate corresponding to the locking threaded hole of each spring support, allowing the front end of the spring sleeve to extend freely, so that the spring sleeve can move smoothly axially when the spring extends and retracts. The main function of the fan-shaped cover plate is to limit the amount of spring extension and contraction and ensure the stability of the form and position deviation during the movement of the spring sleeve. That is, it prevents phenomena such as "getting stuck" or "jamming" from occurring when moving along the through holes.

[0056] The spring support 6 is composed of a left-end tension threaded section 6.1 and a right-end positioning cylinder 6.2. The left-end tension threaded section is engaged with the spring support locking threaded hole on the sector housing, and the end face adjacent to the thread is the limiting surface. The right-end positioning cylinder is engaged with the inner diameter of the spring to ensure that the spring extends and retracts along the cylindrical direction and to ensure that the position deviation is stable when the spring extends and retracts.

[0057] The spring sleeve is a stepped cylindrical sleeve, with the outer diameter of the left cylinder (3.3) being larger than that of the right cylinder (3.1). The left cylinder's size is also larger than the outer diameter of the spring and the through hole on the sector-shaped cover plate. This design ensures complete contact with the spring's circumference and prevents the spring sleeve from shifting outwards and falling off. The left inner hole (3.3) is a positioning hole that mates with the positioning cylinder on the right end of the spring support. A threaded hole is provided on the right end of the spring sleeve for fixed connection with the conformal self-adaptive silicone body.

[0058] The conformal adaptive silicone body is made of silicone through part molding, and has a fan-shaped block structure. Its front side has a conformal groove 4.1 that fits tightly against the right end of the part. When the part deforms, the silicone body has good self-adaptive ability, does not exert external force on the part, prevents secondary deformation, and has good energy absorption effect. It can be fixedly connected to the right end of the spring sleeve with screws.

[0059] The locking claw of the part has a fan-shaped columnar structure, with a fan-shaped notch 5.2 at its right end. The outer circular surface and bottom surface of the fan-shaped notch serve as the clamping surface and limiting surface of the part, respectively. An axial locking through hole 5.1 is provided on the locking claw around the fan-shaped notch, which can be used with bolts and T-blocks to tighten and fix it to the universal hydraulic chuck. A toothed boss 5.3 is provided on the left end of the locking claw, which can cooperate with the toothed boss on the universal hydraulic chuck to form a self-positioning mechanism, improving the positioning accuracy after disassembly.

[0060] The airbag-type auxiliary support 7 consists of an annular airbag 7.1 located at the left end and an auxiliary support plate located at the right end. The annular airbag and the auxiliary support plate are coaxially bonded and fixed. The auxiliary support plate consists of two parts: a positioning disc 7.2 and a limiting disc 7.3 arranged on the left and right sides. The diameter of the positioning disc matches the inner diameter of the part and can mate with the inner hole of the part. Its adjacent end face is a limiting end face, which can fit against the end face of the part. The diameter of the limiting disc is greater than or equal to the outer diameter of the part. A central conical hole 7.5 is provided at the right end of the auxiliary support plate for mating with the tip conical surface. An inflation / deflation hole 7.4 is provided on the auxiliary support plate, which communicates with the air inlet and outlet on the airbag. In use, it can be inflated, and the airbag expands to fit tightly against the inner hole of the part to achieve a vibration reduction effect.

[0061] The adaptive circumferential vibration damping fixture 8 has an inner diameter that matches the outer diameter of the part. This fixture consists of two semicircular rings 8.1, connected at one end by a hinge structure 8.3. The hinge structure is simple, safe, and reliable. During use, the two semicircles can be rotated around the hinge as a pivot point, allowing the fixture to be opened for easy assembly and disassembly. The two semicircular rings are connected at the other end by a folding buckle 8.4. A silicone layer 8.2 is adhered to the inner side of the two semicircular rings. The silicone has a built-in shock-absorbing function, achieving vibration damping while also adapting to the outer diameter of the part within a certain range. It prevents external force from being applied to the part when it deforms, thus preventing secondary deformation. The mirror-shaped end of the hinge uses a folding buckle mechanism similar to a watch strap. This mechanism is a standard part, simple in structure, and its working characteristics include safety and sturdiness. When the folding buckle is open, the two semicircular rings can rotate relative to each other; it can be locked during operation. This mechanism further simplifies the assembly and disassembly process of the fixture.

[0062] A method for manufacturing a momentum wheel thin-walled sealing cover includes the following steps:

[0063] Step 1: Use a general-purpose jig 9 (three-jaw or four-jaw jig) to clamp the inner hole end of part 11, and set an inner hole support fixture 10 in the inner hole of the part. The inner hole support fixture is a disk-shaped rigid fixture. Roughly machine the outer circular sidewall, process shank 11.1, and process shank sidewall of the part blank. Specifically:

[0064] Because this process has a relatively large allowance, and due to the part's structure, deformation is quite severe during rough machining with large cutting amounts, a suitable internal hole support fixture is selected to clamp the outer circle. The outer circle sidewall, process shank, and process shank sidewall are machined, leaving a 0.3mm allowance on each side. In mass production, all parts can be machined to the same dimensions in this process. The purpose of this process is not to remove the allowance, but mainly to establish a reference for subsequent finishing to ensure easier processing later.

[0065] Step 2: Install the assembled adaptive sidewall vibration damping fixture onto the general hydraulic chuck 13 to clamp and fix the process shank end of the part, and make the right end of the part elastically contact the adaptive sidewall vibration damping fixture; then, fit the adaptive circumferential vibration damping fixture onto the outer circle of the part; then, perform precision machining on the inner hole of the part to achieve the design dimensions.

[0066] The assembly process of the adaptive sidewall vibration damping fixture is described in [link to documentation]. Figure 15 :

[0067] First, multiple spring supports 6 are tightened one by one through the left end tension thread section and the multiple spring support locking thread holes on the fan-shaped vibration damping housing; then, multiple springs 12 are inserted along the direction of the spring support positioning cylinder; then, multiple spring sleeves 3 are fitted with the multiple support positioning cylinders through the positioning holes; then, the fan-shaped cover plate 2 is positioned by fitting the lower end rounded protrusion with the rounded corner of the housing, ensuring the positional accuracy of the hole in the middle of the cover plate and the limiting cylinder of the tail spring sleeve, thereby ensuring the smooth operation of the limiting cylinder and preventing "jamming" and other phenomena, and is locked with bolts; then, the conformal adaptive silicone body 4 is connected to the top end face of the fitted spring sleeve with screws; finally, the adaptive side wall vibration damping fixture and the part locking claw 5 are fitted with the toothed boss at their rear ends and the toothed boss of the machine tool accessory universal hydraulic chuck 13, and locked with T-blocks and bolts, see [reference]. Figure 16 .

[0068] After completing the above assembly, the process shank of the part, which was machined in the first step, is clamped by passing the limiting surface and clamping surface on the locking jaws. The clamping details are as follows: Figure 17 As shown, the general assembly drawing is as follows Figure 18 As shown.

[0069] After completing the above steps, the adaptive circumferential vibration damping fixture 8 is placed in contact with the outer circle of the part through the silicone on the inner side of the ring, and then locked to the outer circle of the part by the folding buckle, as shown. Figure 19 As shown.

[0070] After assembling the parts and all tooling, machine all internal hole features and adjacent end faces of the ø258 gauge to the dimensions shown in the drawing. Since the internal holes are semi-closed, use a combination of forward and reverse boring tools, working from the top and bottom. Figure 20 As shown.

[0071] Step 3: Remove the adaptive circumferential vibration damping fixture, insert the airbag portion of the airbag auxiliary support into the inner hole of the part, and inflate it until the airbag contacts the inner hole wall of the part; then, use the tailstock's built-in tail point to press down on the center position of the right end rigid part of the airbag auxiliary support; then, perform finish machining on the outer circle of the part to achieve the design dimensions; specifically:

[0072] The annular airbag of the airbag-type auxiliary support 7 is placed into the machined inner hole of the part. The airbag-type auxiliary support mates with the machined inner hole and end face respectively through the positioning disc and adjacent limiting end face. After mating, the tailstock-built tail point 14 of the machine tool is used. The tail point mates with the tapered hole of the airbag-type auxiliary support, and a certain pressure is applied to achieve vibration reduction. After all the steps are completed, the internal airbag is inflated through the external inflation and deflation holes of the airbag-type auxiliary support. After inflation to a certain pressure, the upper surface of the airbag can completely fit with the inner hole of the part, solving the problem of vibration caused by insufficient rigidity of the part during cutting. Figure 21 As shown.

[0073] After completing the above operations, machine the ø260 outer diameter to the dimensions required in the drawing.

[0074] Step 4: Remove the adaptive sidewall vibration damping fixture and airbag auxiliary support. Clamp the inner end of the part using a general-purpose jig, and install an inner hole support fixture inside the part's inner hole. Then, finish-machine the outer cylindrical sidewall of the part and remove the process shank to complete the finishing process. Specifically:

[0075] At this stage of machining, only the outer cylindrical sidewall of the part remains unmachined. Select a suitable auxiliary clamping support to hold the ø260 outer diameter. To prevent scratches on the machined surface, a nylon three-jaw chuck can be used to clamp the outer diameter of the part. After removing the process shank, evenly remove the excess material from the sidewall radially. Figure 22 As shown, it is machined to the dimensions required by the drawing.

[0076] In summary, this invention addresses the part clamping problem by adding a process shank as an auxiliary clamping point on the right-end arc face of the part and an auxiliary support at the thin-walled hole on the left end. The invention also designs an adaptive vibration damping fixture, employing an elastic telescopic sleeve on the end face and a movable hinge on the outer circle in contact with the part using soft silicone, thus solving the vibration damping problem during internal hole machining. Furthermore, this invention addresses the vibration damping problem on the outer circle by adding a vibration-damping airbag to the inner hole in conjunction with auxiliary support.

[0077] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A method for processing a thin-walled sealing cover for a momentum wheel, characterized in that: This method requires adding a process shank as an auxiliary clamping point on the right end arc face of the part blank. During the machining process, this method employs internal hole support fixtures, adaptive sidewall vibration damping fixtures, adaptive circumferential vibration damping fixtures, and airbag-type auxiliary supports, and includes the following machining steps: Step 1: Use a general-purpose fixture to clamp the inner hole end of the part blank, and set an inner hole support fixture in the inner hole of the part blank. The inner hole support fixture is a disc-shaped rigid fixture. Roughly machine the outer circular side wall, process shank and process shank side wall of the part blank. Step 2: Install the assembled adaptive sidewall vibration damping fixture onto the general hydraulic chuck, clamp and fix the process shank end of the part, and make the right end of the part elastically contact the adaptive sidewall vibration damping fixture; then, fit the adaptive circumferential vibration damping fixture onto the outer circle of the part; then, perform precision machining on the inner hole of the part. Step 3: Remove the adaptive circumferential vibration damping fixture, insert the airbag part of the airbag auxiliary support into the inner hole of the part, and inflate it until the airbag contacts the inner hole wall of the part; then press the center of the right end rigid part of the airbag auxiliary support with the tailstock built-in tail point; then finish machine the outer circle of the part to achieve the design dimensions. Step 4: Remove the adaptive sidewall vibration damping fixture and airbag auxiliary support. Use a general-purpose fixture to clamp the inner hole end of the part and set an inner hole support fixture in the inner hole of the part. Then, finish machine the outer circular sidewall of the part and remove the process shank to complete the finishing of the part.

2. The processing method of the momentum wheel thin-walled sealing cover according to claim 1, characterized in that: The adaptive sidewall vibration damping fixture consists of a vibration damping module and a clamping module; the vibration damping module consists of three sets, which are assembled into a complete circular structure along the circumference; the clamping module uses part locking claws, which consist of three claws and are assembled into a complete circular structure along the circumference.

3. The processing method of the momentum wheel thin-walled sealing cover according to claim 2, characterized in that: The vibration damping module consists of a fan-shaped vibration damping housing, spring supports, springs, spring sleeves, a fan-shaped cover plate, and a contour-adaptive silicone body. The fan-shaped vibration damping housing has an overall fan-shaped block structure. Two fan-shaped groove areas are provided circumferentially on the front side of the fan-shaped vibration damping housing. Multiple spring support locking threaded holes are evenly distributed on the bottom surface of the two fan-shaped groove areas. Three tensioning through holes are provided axially on the fan-shaped vibration damping housing between the two fan-shaped groove areas, and are fixed to a universal hydraulic chuck by through bolts and matching standard T-blocks. A toothed boss is provided on the back end of the fan-shaped vibration damping housing corresponding to the three tensioning through holes, and is positioned and engaged with the toothed boss on the universal hydraulic chuck. Multiple threaded holes are provided on the front end of the fan-shaped vibration damping housing around the two fan-shaped groove areas. The spring support consists of a left-end tension threaded section and a right-end positioning cylinder. The left-end tension threaded section engages with the spring support locking threaded hole on the sector-shaped housing; the right-end positioning cylinder engages with the spring sleeve. The spring sleeve is a stepped cylindrical sleeve with the outer diameter of the cylinder at the left end being larger than that at the right end. The inner hole at the left end fits with the positioning cylinder at the right end of the spring support and contacts the right end of the spring through its left end. The conformal adaptive silicone body has a fan-shaped block structure. Its front side is provided with a conformal groove that matches the shape of the right end of the part, and its back side is fixedly connected to the right end of the spring sleeve by screws. Multiple screw through holes are provided around the outline of the sector-shaped cover plate, which are aligned with multiple threaded holes on the front end of the sector-shaped vibration damping housing. By installing screws, it is tightened and fixed to the sector-shaped vibration damping housing. A through hole is provided on the sector-shaped cover plate at the position corresponding to the locking threaded hole of each spring support, so that the right end positioning cylinder of the spring sleeve can protrude.

4. The processing method of the momentum wheel thin-walled sealing cover according to claim 3, characterized in that: The back of the fan-shaped cover plate has four rounded protrusions, which are positioned and matched with the rounded corners of the outer grooves of the two fan-shaped groove areas on the shock-absorbing housing.

5. The processing method of the momentum wheel thin-walled sealing cover according to claim 2, characterized in that: The locking claw of the part has a fan-shaped columnar structure, with a fan-shaped notch at its right end. The outer circular surface and bottom surface of the fan-shaped notch are the clamping surface and limiting surface of the part, respectively. An axial locking through hole is provided on the locking claw around the fan-shaped notch. The part is tightened and fixed on the universal hydraulic chuck by bolts and matching T-blocks inserted into the locking through hole. A toothed boss is provided on the left end of the locking claw, which is positioned and engaged with the toothed boss on the universal hydraulic chuck.

6. The processing method of the momentum wheel thin-walled sealing cover according to claim 1, characterized in that: The airbag-type auxiliary support consists of an annular airbag at the left end and an auxiliary support plate at the right end; the annular airbag and the auxiliary support plate are coaxially bonded and fixed; the auxiliary support plate consists of two parts: a positioning disc and a limiting disc arranged on the left and right sides; the diameter of the positioning disc matches the inner diameter of the part, and the positioning disc mates with the inner diameter of the part; the end face adjacent to the positioning disc is the limiting end face, which fits against the end face of the part; the diameter of the limiting disc is greater than or equal to the outer diameter of the part; a central conical hole is provided at the right end of the auxiliary support plate for mating with the tip conical surface; and an inflation / deflation hole is provided on the auxiliary support plate, which communicates with the air inlet and outlet ports on the airbag.

7. The processing method of the momentum wheel thin-walled sealing cover according to claim 1, characterized in that: The inner diameter of the adaptive circumferential vibration damping fixture matches the outer diameter of the part; the adaptive circumferential vibration damping fixture consists of two semicircular rings, which are connected at one end by a hinge structure and at the other end by a folding buckle. A silicone layer is bonded to the inside of the two semicircular rings, and the silicone layer contacts the outer surface of the part.

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