Flexible fixture for machining thin-walled machine covers

Abstract

The utility model relates to technical field of machining auxiliary equipment, disclose a flexible fixture of processing thin wall machine cover, aims at solving the problem of thin wall machine cover processing easy deformation, low precision. It includes bottom plate, auxiliary support plate, front limit block, front lower / rear lower limit block, cylindrical baffle, rear fixed block, flexible abutment block, guide bushing, spring no. One, drive rod, still can be equipped with drive cylinder, left fixed block etc. Auxiliary support plate inside support adapts machine cover assembly joint surface, prevents deformation, multi -directional limit block realizes machine cover accurate positioning, flexible abuttment block cooperation spring no. One forms flexible clamping, and drive cylinder can control clamping rhythm. The fixture passes through " inside support + multidirectional positioning + flexible clamping " cooperation, avoids thin wall machine cover clamping and processing deformation, guarantees assembly joint surface precision, promotes processing qualified rate and efficiency, adapts power or transmission system thin wall machine cover processing demand.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary equipment for mechanical processing, and specifically to a flexible fixture for processing thin-walled machine covers. Background Technology

[0002] Similar to Figure 1 The thin-walled cover 100 shown is a core encapsulation component of power or transmission systems such as engines, reducers, and hydraulic valve groups. The machining accuracy of its assembly mating surface 101 directly determines the sealing performance, assembly coaxiality, and operational stability of the entire machine. This mating surface must meet high requirements for flatness and surface roughness, and must fit seamlessly with the machine body to avoid problems such as oil leakage, gas leakage, or vibration noise during subsequent use. However, the thin-walled cover 100 is an irregularly shaped shell structure, usually with a thin wall thickness, poor overall rigidity, and weak resistance to deformation. Even with relatively regular left end plane 102, front side facade 103, rear side facade 104, and right end facade 105, the existing clamping modes of ordinary fixtures are difficult to adapt. Ordinary fixtures mostly adopt the clamping mode of "rigid positioning block + single-point clamping". In this mode, the clamping force is easily concentrated at the local contact point of the end plate surface 102 and the side facade 103, which directly causes obvious dents or overall warping of the workpiece. Moreover, when the fixture is released after processing, the workpiece rebounds due to its own elastic characteristics, which causes the actual accuracy of the assembly mating surface 101 to deviate significantly from that during processing, far exceeding the design tolerance requirements. Ultimately, this results in a high scrap rate of the workpiece, which seriously restricts production efficiency and processing quality. In existing technologies, although some solutions attempt to improve the deformation problem through elastic clamps or vacuum adsorption clamps, the rigidity of the support points of elastic clamps is not adjustable, making it impossible to adapt to the stress requirements of different wall thickness areas of thin-walled machine covers. Vacuum adsorption clamps, on the other hand, are limited by the irregular structure of thin-walled machine covers, and the poor sealing of the adsorption surface makes it easy for insufficient adsorption force to occur due to local gaps, still failing to solve the problem of clamping deformation. Therefore, developing a flexible clamp that can precisely control the clamping force and avoid workpiece deformation has become a key requirement for solving the high-precision machining of the assembly mating surface 101 of thin-walled machine covers 100. Utility Model Content

[0003] To overcome one or more of the technical defects in the existing technology, this utility model provides a flexible fixture for processing thin-walled machine covers. The technical solution adopted is as follows: A flexible fixture for processing thin-walled machine covers includes a base plate fixedly connected to the processing equipment, and further includes... An auxiliary support plate, the outer contour of which is adapted to the inner contour of the assembly mating surface of the thin-walled machine cover, and when the auxiliary support plate is coplanar with the assembly mating surface, the front side of the auxiliary support plate is in a transition fit or interference fit with the inner wall of the front vertical surface of the thin-walled machine cover, and the rear side of the auxiliary support plate is in a transition fit or interference fit with the inner wall of the rear vertical surface of the thin-walled machine cover. A front limiting block is fixedly connected to the front end of the base plate, and the front limiting block is in contact with the outer wall surface of the front side of the thin-walled machine cover. Two front lower limit blocks are fixedly connected to the rear side of the front limit block, and the two front lower limit blocks can respectively enter the left nail head recess and the right nail head recess on the outer wall of the front side of the thin-walled machine cover with gaps. The upper end surfaces of the two front lower limit blocks respectively abut against the bottom surfaces of the left nail head recess and the right nail head recess. The lower rear limit block is fixedly connected to the base plate and can be inserted into the recessed central nail head groove on the outer wall of the rear side facade of the thin-walled machine cover. The upper end face of the lower rear limit block abuts against the bottom surface of the central nail head groove. A cylindrical baffle is fixedly connected to the right end of the base plate, and the cylindrical baffle is in contact with the right end facade line of the thin-walled machine cover. The rear fixing block is fixedly connected to the rear end of the base plate. The front side of the rear fixing block is provided with two sets of external guide holes, each set of which has two external guide holes and the axial direction is along the front-back direction, for a total of four external guide holes. Two flexible abutment blocks are located in front of the rear fixing block and on the left and right sides of the rear lower limit block, respectively. Each flexible abutment block has an inner guide hole at the two outer guide holes on its rear side. Four guide sleeves, which are respectively slidably engaged with corresponding outer guide holes and inner guide holes; Four springs are placed inside four guide sleeves, and the two ends of each spring abut against the bottom wall of the corresponding outer guide hole and the bottom wall of the corresponding inner guide hole, respectively. Two drive rods are provided, with their axes running in the front-rear direction. The front end of each drive rod passes through the rear fixing block and is then fixedly connected to a flexible abutment block.

[0004] Furthermore, it also includes a drive cylinder and a connecting rod; the drive cylinder is fixedly connected to the rear side of the rear fixed block, and its piston rod is fixedly connected to the middle of the connecting rod. The length of the connecting rod is along the left-right direction, and its left and right ends are respectively provided with through holes in the axial direction along the front-back direction; the drive rod is clearance-fitted with the through holes, its front end is screwed to the flexible abutment block, and its rear end is fixedly connected with a nail head, the outer diameter of the nail head being larger than the inner diameter of the through hole; when the drive cylinder is inflated, its piston rod drives the connecting rod to move backward, thereby driving the flexible abutment block to move closer to the rear fixed block so as to insert the thin-walled machine cover; when the drive cylinder is slowly deflated, the flexible abutment block moves slowly forward under the elastic action of the spring until it abuts against the outer wall of the rear side of the thin-walled machine cover.

[0005] Furthermore, it also includes a left fixing block, two guide rods, and two springs; the left fixing block is fixedly connected to the left end of the base plate, and the two guide rods are fixedly connected to the upper end face of the left fixing block and extend in the vertical direction; each guide rod is fitted with a spring, the lower end of the spring abuts against the upper end face of the left fixing block, and the upper end elastically abuts against the lower surface of the left end plane of the thin-walled machine cover.

[0006] Furthermore, the left and right lengths of the auxiliary support plate are 70%-90% of the inner contour length of the assembly mating surface of the thin-walled hood.

[0007] Furthermore, the lower surface of the auxiliary support plate is fixed with multiple reinforcing ribs extending in the front-rear direction.

[0008] Furthermore, the auxiliary support plate has at least one weight-reducing hole.

[0009] Furthermore, the auxiliary support plate has rounded corners at all four corners, with a radius of 2-5 mm.

[0010] Furthermore, the lower end of the cylindrical stop is integrally formed with a screw, and the right end of the base plate is provided with a threaded hole corresponding to the position of the screw. The screw and the threaded hole are threaded together to realize the fixed connection between the cylindrical stop and the base plate. Two opposing torsion grooves are formed in the middle of the cylindrical stop along its radial direction. The groove depth of the two torsion grooves penetrates the radial section of the cylindrical stop, and the groove width is adapted to the size of the wrench jaws. This is used to adjust the installation height or tightness of the cylindrical stop by twisting it with a wrench.

[0011] Furthermore, the front side of the flexible abutment block has multiple linear grooves, all of which extend in the left-right direction and are spaced apart in the front-back direction. The linear grooves are used to increase the friction between the front side of the flexible abutment block and the outer wall of the rear vertical surface of the thin-walled cover, so as to prevent the thin-walled cover from shifting in the left-right direction after clamping.

[0012] The beneficial technical effects of this utility model are as follows: 1. The internal support structure solves the problem of thin-walled deformation and ensures the machining accuracy of assembly surfaces. The auxiliary support plate adapts its outer contour to the inner contour of the assembly surface of the thin-walled machine cover, and forms a transition or interference fit with the inner wall of the front and rear side facades of the machine cover, providing uniform support from inside the workpiece. This avoids the local depressions and overall warping caused by the "external rigid clamping" of ordinary fixtures, and can maintain the initial shape of the assembly surface during processing. It effectively weakens the impact of elastic rebound on accuracy, significantly reduces the scrap rate caused by deformation, and ensures that the flatness and surface roughness of the mating surface meet the design requirements.

[0013] 2. Multi-reference collaborative positioning avoids clamping offset and loss of accuracy control. The front limit block, front lower limit block, rear lower limit block, and cylindrical stop form a multi-directional positioning system: the front lower limit block and rear lower limit block use the nail head groove on the cover to achieve precise "hole-to-surface" positioning and avoid false positioning; the cylindrical stop makes contact with the right end facade to adapt to the irregular contour, and the front limit block fits against the outer wall of the front facade to restrict forward and backward movement. The multi-reference coordination ensures that there is no offset after the cover is clamped, effectively improving the coaxiality of the assembly mating surface and the cover reference structure such as the left end plane and pre-machined holes, and solving the problem of poor positioning adaptability of ordinary fixtures.

[0014] 3. Flexible clamping and adaptive adjustment to meet the deformation resistance requirements of thin-walled parts. The flexible abutment block, together with spring one, forms an "elastic clamping unit". The drive cylinder slowly releases air, causing the flexible abutment block to gradually adhere to the rear side of the hood under the action of the spring force, avoiding the force concentration of rigid clamping. At the same time, spring one can adaptively adjust the elastic force according to the slight deformation of the hood, ensuring that the clamping force is evenly applied to the contact surface, achieving stable clamping without generating additional deformation stress, perfectly adapting to the structural characteristics of thin-walled hoods that are "poorly rigid and easily deformed".

[0015] 4. Bidirectional flexible constraints further enhance clamping stability. The guide rod on the left fixed block and the second spring form an upper elastic support structure. The second spring elastically abuts against the lower surface of the left end plane of the cover, forming a "double constraint" with the lower front limit block and the lower rear limit block at the bottom. This not only prevents the cover from moving up and down during processing, but also avoids deformation caused by rigid pressure at the upper end through the flexibility of the second spring. It is especially suitable for the thin-walled structure of the left end plane area, further improving the overall clamping stability.

[0016] 5. Structural optimization enhances practicality and adaptability, reducing operational difficulty. The auxiliary support plate achieves weight reduction by using weight-reducing holes to lower the overall weight of the fixture, making installation and debugging easier, while reinforcing ribs ensure its own support rigidity; the cylindrical stop, with its screw and torsion groove design, allows for easy adjustment of the installation height and tightness, adapting to the dimensional deviations of different batches of machine covers; the linear groove of the flexible abutment block increases the friction with the machine cover, preventing lateral deviation—these detailed optimizations improve the durability of the fixture, reduce operational complexity, and meet the needs of efficient changeover and debugging in actual production.

[0017] In summary, this fixture, through its collaborative design of "internal support to prevent deformation + multi-reference positioning + flexible clamping," fundamentally solves the problems of deformation and loss of precision control when ordinary fixtures process thin-walled machine covers. At the same time, it takes into account practicality and adaptability, can stably ensure high-precision processing of assembly mating surfaces, significantly improve production efficiency and product qualification rate, and meet the stringent assembly requirements of power or transmission systems for thin-walled machine covers. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the thin-walled machine cover processed by the present invention.

[0019] Figure 2 for Figure 1 A structural diagram from another perspective.

[0020] Figure 3 This is a schematic diagram of the structure of the present invention after the thin-walled machine cover is clamped.

[0021] Figure 4 This is a schematic diagram of the structure of this utility model without the thin-walled cover being clamped.

[0022] Figure 5 for Figure 4 A magnified view of a section at point B.

[0023] Figure 6 for Figure 4 Cross-sectional view.

[0024] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle. Detailed Implementation

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the paper. This orientation or positional relationship is only for the convenience of describing this utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] like Figure 1-7A flexible fixture for processing thin-walled machine covers is shown, comprising a base plate 1 fixedly connected to the processing equipment and: The auxiliary support plate 2 has an outer contour that is adapted to the inner contour of the assembly mating surface 101 of the thin-walled machine cover 100. When the auxiliary support plate 2 is coplanar with the assembly mating surface 101, the front side of the auxiliary support plate 2 is in a transition fit or interference fit with the inner wall of the front side facade 103 of the thin-walled machine cover 100, and the rear side of the auxiliary support plate 2 is in a transition fit or interference fit with the inner wall of the rear side facade 104 of the thin-walled machine cover 100. The front limiting block 3 is fixedly connected to the front end of the base plate 1, and the front limiting block 3 is in contact with the outer wall surface of the front side facade 103 of the thin-walled machine cover 100. Two front lower limit blocks 4 are fixedly connected to the rear side of the front limit block 3. The two front lower limit blocks 4 can respectively enter the left nail head groove 106 and the right nail head groove 107 recessed inward on the outer wall of the front side facade 103 of the thin-walled machine cover 100. The upper end surfaces of the two front lower limit blocks 4 respectively abut against the bottom surfaces of the grooves of the left nail head groove 106 and the right nail head groove 107. The lower rear limit block 5 is fixedly connected to the base plate 1, and the lower rear limit block 5 can be inserted into the middle nail head groove 108 recessed inward on the outer wall of the rear side facade 104 of the thin-walled machine cover 100. The upper end face of the lower rear limit block 5 abuts against the bottom surface of the middle nail head groove 108. A cylindrical baffle 6 is fixedly connected to the right end of the base plate 1, and the cylindrical baffle 6 is in line contact with the right end facade 105 of the thin-walled machine cover 100. The rear fixing block 7 is fixedly connected to the rear end of the base plate 1. The front side of the rear fixing block 7 is provided with two sets of external guide holes 71. Each set of external guide holes 71 consists of two holes and the axial direction is along the front-rear direction. The total number of external guide holes 71 is four. Two flexible abutment blocks 8 are located in front of the rear fixing block 7 and on the left and right sides of the rear lower limit block 5, respectively. Each flexible abutment block 8 has an inner guide hole 81 at the two outer guide holes 71 on its rear side. Four guide sleeves 9, which are respectively slidably engaged with the corresponding outer guide hole 71 and inner guide hole 81; Four springs 10 are placed inside four guide sleeves 9, and the two ends of each spring 10 abut against the bottom wall of the corresponding outer guide hole 71 and the bottom wall of the corresponding inner guide hole 81, respectively. Two drive rods 11 are arranged axially in the front-rear direction. The front end of each drive rod 11 passes through the rear fixing block 7 and is fixedly connected to a flexible abutment block 8.

[0029] I. Working principle of this embodiment This flexible fixture is based on a collaborative design logic of "internal support to prevent deformation + multi-reference positioning + flexible clamping," specifically addressing the processing pain points of "poor rigidity and easy deformation" in thin-walled machine covers. The core principle is as follows: Internal support for deformation resistance: The auxiliary support plate 2 adapts to the inner contour of the assembly mating surface 101 of the thin-walled machine cover 100 through its outer contour, and forms a transition / interference fit with the inner walls of the front and rear side facades 103 and 104, providing uniform support from inside the workpiece, offsetting the dents and warping caused by external clamping forces and cutting forces, and maintaining the shape stability of the assembly mating surface 101 during processing.

[0030] Multi-directional reference positioning: the front limit block 3 restricts the front and rear movement of the cover, the front lower limit block 4 and the rear lower limit block 5 achieve precise "surface-groove" positioning through the matching nail head grooves 106, 107 and 108 to prevent vertical displacement, and the cylindrical baffle 6 makes line contact with the right end facade 105 to restrict left and right displacement. The four work together to form a six-directional positioning system of "front, back, left, right and up" to avoid loss of accuracy due to false positioning or over-positioning.

[0031] Flexible clamping for precision: The flexible abutment block 8, together with the spring 10, forms an elastic clamping unit. The clamping rhythm is controlled by the drive cylinder. When the air is slowly depressurized, the spring force pushes the abutment block to gradually fit against the rear side surface 104, avoiding the force concentration of rigid clamping. The spring 10 can adaptively adjust its elasticity according to the slight deformation of the cover, ensuring uniform clamping force and no additional deformation stress. At the same time, the guide sleeve 9 ensures the stability of the abutment block's movement trajectory and avoids deviation.

[0032] II. Working Process of this Embodiment Based on the actual machining operation process, it is carried out in four steps: "preparation - clamping - machining - unloading". Step 1: Fixture initial state adjustment and preparation stage If a drive cylinder is configured, the cylinder is controlled to inflate: the piston rod drives the connecting rod to move backward, and the two flexible abutment blocks 8 are pulled towards the rear fixed block 7 simultaneously by the nail head of the drive rod 11, compressing the spring 10 so that there is enough space between the abutment block and the front limit block 3, which is convenient for the thin-walled machine cover 100 to be inserted. Check the status of each limiting component: confirm that the front lower limit block 4 and the rear lower limit block 5 are firmly installed, the cylindrical stop 6 is stably connected to the base plate 1, and the position of the auxiliary support plate 2 is adapted to the inner contour of the assembly mating surface 101.

[0033] Step 2: Clamping and Positioning of Thin-Walled Machine Cover The manual / robotic arm places the thin-walled machine cover 100 into the fixture: the outer wall of the front side facade 103 is attached to the front limiting block 3, the left nail head groove 106 and the right nail head groove 107 are respectively fitted into the bottom surface of the two front lower limiting blocks 4 and abut against the upper end surface of the limiting block, and the middle nail head groove 108 is fitted into the rear lower limiting block 5 and abuts and is positioned in the same way. At the same time, ensure that the auxiliary support plate 2 is embedded in the inner contour of the assembly mating surface 101, and forms a close fit with the inner walls of the front and rear side facades 103 and 104, and the right side facade 105 naturally contacts the cylindrical stop 6 to complete multi-directional positioning.

[0034] Step 3: Flexible clamping and processing stage Control the drive cylinder to slowly depress: Spring 10 loses the constraint of cylinder tension and gradually releases elastic force, pushing the two flexible abutment blocks 8 to move forward along the guide trajectory of guide sleeve 9 until they evenly abut against the outer wall of the rear side facade 104 of thin-walled machine cover 100, thus achieving flexible clamping. Start the processing equipment: perform milling, grinding and other processing on the assembly mating surface 101. During the processing, the auxiliary support plate 2 maintains the shape of the mating surface from the inside, the spring 10 adaptively adjusts the clamping force according to the slight change of the cutting force, and the multi-directional limit block prevents the cover from shifting and ensures the processing accuracy. If the left fixing block 14 and spring 16 are configured, spring 16 elastically abuts against the lower surface of the left end plane 102 of the machine cover, forming a two-way constraint, further preventing vertical movement during processing.

[0035] Step 4: Fixture reset and cover unloading stage After processing is completed, the control drive cylinder is refilled: the piston rod drives the connecting rod to move backward, and the drive rod 11 pulls the flexible abutment block 8 to move backward, disengaging from the rear side surface 104 and releasing the clamping; The manual / robotic arm removes the thin-walled machine cover 100 from the fixture: it is lifted vertically upwards, causing the nail head groove to disengage from the front and rear lower limit blocks, thus completing the unloading; Fixture reset: Check whether the auxiliary support plate 2, limit block and other components are intact, and prepare for the next workpiece to be clamped.

[0036] In another preferred embodiment, the system further includes a drive cylinder 12 and a connecting rod 13. The drive cylinder 12 is fixedly connected to the rear side of the rear fixing block 7, and its piston rod is fixedly connected to the middle of the connecting rod 13. The connecting rod 13 is longitudinally oriented in the left-right direction, and its left and right ends are respectively provided with through holes 131 axially in the front-back direction. The drive rod 11 is clearance-fitted with the through hole 131, its front end is screwed to the flexible abutment block 8, and its rear end is fixedly connected with a nail head 111. The outer diameter of the nail head 111 is larger than the inner diameter of the through hole 131. When the drive cylinder 12 is inflated, its piston rod drives the connecting rod 13 to move backward, thereby driving the flexible abutment block 8 to move closer to the rear fixing block 7 so as to insert the thin-walled cover 100. When the drive cylinder 12 is slowly deflated, the flexible abutment block 8 moves slowly forward under the elastic action of the spring 10 until it abuts against the outer wall of the rear side facade 104 of the thin-walled cover 100. This preferred embodiment achieves automated control of the flexible abutment block clamping action through the coordinated design of the drive cylinder and connecting rod: when the cylinder is inflated, it can quickly pull the abutment block backward, leaving sufficient space for the thin-walled cover to be placed, eliminating the need for manual adjustment of the clamping components and reducing the difficulty of operation; when the cylinder is slowly deflated, the spring force pushes the abutment block to gradually fit against the rear side of the cover, avoiding the force concentration problem caused by rigid clamping. At the same time, the synchronous transmission of the connecting rod ensures that the two abutment blocks move in unison and the clamping force is evenly distributed, which not only improves the clamping efficiency, but also further protects the thin-walled cover from overload deformation, adapting to the automated operation requirements in mass production.

[0037] In another preferred embodiment, it also includes a left fixing block 14, two guide rods 15 and two springs 16; the left fixing block 14 is fixedly connected to the left end of the base plate 1, and the two guide rods 15 are both fixedly connected to the upper end face of the left fixing block 14 and extend in the vertical direction; each guide rod 15 is fitted with a spring 16, the lower end of the spring 16 abuts against the upper end face of the left fixing block 14, and the upper end elastically abuts against the lower surface of the left end plane 102 of the thin-walled machine cover 100. The upper elastic support structure, consisting of the left fixed block, guide rod, and spring two, forms a "bidirectional constraint" with the bottom front and rear lower limit blocks: spring two elastically abuts against the lower surface of the left end plane of the cover, which can effectively prevent the cover from moving up and down due to cutting force during processing. At the same time, the flexible support characteristics avoid deformation of the left end plane caused by rigid pressure at the upper end; the guide rod provides stable guidance for spring two, preventing support failure caused by spring offset, further enhancing the overall clamping stability of the cover, and ensuring the positional accuracy matching between the assembly mating surface and the left end plane.

[0038] In another preferred embodiment, the left and right lengths of the auxiliary support plate 2 are 70%-90% of the inner contour length of the assembly mating surface 101 of the thin-walled hood 100. Limiting the left and right lengths of the auxiliary support plate to 70%-90% of the inner contour length of the assembly mating surface ensures that the support plate provides sufficient support area from inside the hood, effectively offsetting external clamping and cutting forces and preventing local depressions or overall warping of the assembly mating surface. It also cleverly avoids any protruding structures (such as reinforcing ribs or interface bases) that may exist inside the thin-walled hood, preventing interference between the support plate and the internal structure of the hood. This balances support stability and structural adaptability, avoiding assembly difficulties caused by an excessively long support plate or insufficient support caused by an excessively short support plate.

[0039] In another preferred embodiment, the lower surface of the auxiliary support plate 2 is fixed with multiple reinforcing ribs extending in the front-rear direction. These multiple front-rear reinforcing ribs on the lower surface of the auxiliary support plate can significantly improve the structural rigidity of the support plate itself without increasing its overall thickness, preventing bending deformation during support and ensuring stable support of the assembly joint surface. Simultaneously, the reinforcing ribs extend in the front-rear direction, aligning with the force direction of the support plate, which can more efficiently disperse the supporting force, avoid the risk of cracking caused by localized stress concentration, extend the service life of the clamp, and ensure the reliability of the internal support of the thin-walled machine cover.

[0040] In another preferred embodiment, the auxiliary support plate 2 is provided with at least one weight-reducing hole 21. This preferred embodiment, by providing a weight-reducing hole on the auxiliary support plate, effectively reduces the overall weight of the support plate, decreases the load on the fixture during installation, facilitates precise alignment and assembly of the support plate with the inner contour of the machine cover, and avoids installation position deviations caused by excessive support plate weight. Furthermore, it saves on metal material usage, reduces fixture manufacturing costs, and the weight-reducing hole forms an airflow channel, facilitating heat dissipation in the contact area between the support plate and the machine cover during processing, preventing excessively high local temperatures from affecting workpiece processing accuracy, thus balancing economy and practicality.

[0041] In another preferred embodiment, the auxiliary support plate 2 has rounded corners at all four corners, with a radius of 2-5 mm. The rounded corner design (2-5 mm radius) effectively eliminates the risk of sharp corners scratching the inner wall of the thin-walled machine cover. The thin-walled machine cover has a thin inner wall and its surface is easily damaged. The rounded corners allow the support plate to be inserted more smoothly into the inner contour of the machine cover, preventing sharp corners from scratching the inner wall surface and protecting the appearance and structural integrity of the workpiece. Simultaneously, the rounded corners disperse stress concentration at the four corners of the support plate, improving its structural strength and preventing cracking due to excessive corner stress during long-term use, thus extending the support plate's service life. Furthermore, the rounded corner design does not affect the fit and support effect between the support plate and the inner wall of the machine cover.

[0042] In another preferred embodiment, the lower end of the cylindrical stop 6 is integrally formed with a screw, and the right end of the base plate 1 is provided with a threaded hole corresponding to the position of the screw. The screw and the threaded hole are threaded together to realize the fixed connection between the cylindrical stop 6 and the base plate 1. The middle part of the cylindrical stop 6 is provided with two opposing torsion grooves 61 along its radial direction. The groove depth of the two torsion grooves 61 penetrates the radial section of the cylindrical stop 6, and the groove width is adapted to the size of the wrench jaw, so as to adjust its installation height or tightness by torsion of the cylindrical stop 6 with a wrench. The cylindrical stop is connected to the base plate by a screw at the lower end and a torsion groove in the middle, which allows for convenient adjustment of the stop height. By inserting a wrench into the torsion groove and twisting the stop, the height of the stop can be adjusted by screwing the screw in to the desired depth. This eliminates the need to disassemble the entire stop and allows for quick adaptation to dimensional deviations on the right side of the thin-walled machine cover from different batches. It ensures that the stop and the right side of the machine cover maintain stable line contact and avoids left and right positioning offsets caused by improper stop height. At the same time, the screw connection method facilitates disassembly and assembly, making it easy to maintain and replace the stop and improving the adaptability and debugging efficiency of the fixture.

[0043] In another preferred embodiment, the front side of the flexible abutment block 8 has multiple linear grooves, all extending in the left-right direction and spaced apart in the front-back direction. These linear grooves increase the friction between the front side of the flexible abutment block 8 and the outer wall of the rear facade 104 of the thin-walled cover 100, preventing the thin-walled cover 100 from shifting in the left-right direction after clamping. The multiple left-right linear grooves on the front side of the flexible abutment block significantly increase the contact friction between the abutment block and the outer wall of the rear facade of the cover. During processing, the cutting force can easily cause a slight shift in the left-right direction of the thin-walled cover; the concave-convex structure formed by the linear grooves effectively suppresses this shift, improving clamping stability. Furthermore, the spaced linear grooves in the front-back direction do not disrupt the overall flatness of the abutment block surface, ensuring that the clamping force is still evenly transmitted to the cover surface. This avoids localized deformation caused by the rigid anti-slip structure and enhances the positioning effect through friction, ensuring processing accuracy.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flexible fixture for processing thin-walled machine covers, comprising a base plate (1) fixedly connected to a processing device, characterized in that, Also includes The auxiliary support plate (2) has an outer contour that is adapted to the inner contour of the assembly mating surface (101) of the thin-walled machine cover (100). When the auxiliary support plate (2) is coplanar with the assembly mating surface (101), the front side of the auxiliary support plate (2) is in a transition fit or interference fit with the inner wall of the front side facade (103) of the thin-walled machine cover (100), and the rear side of the auxiliary support plate (2) is in a transition fit or interference fit with the inner wall of the rear side facade (104) of the thin-walled machine cover (100). The front limiting block (3) is fixedly connected to the front end of the base plate (1) and the front limiting block (3) is in contact with the outer wall surface of the front side facade (103) of the thin-walled machine cover (100); Two lower front limit blocks (4) are fixedly connected to the rear side of the lower front limit block (3), and the two lower front limit blocks (4) can respectively enter the left nail head recess (106) and the right nail head recess (107) of the outer wall of the front side facade (103) of the thin-walled machine cover (100) with gaps. The upper end surfaces of the two lower front limit blocks (4) respectively abut the bottom surfaces of the left nail head recess (106) and the right nail head recess (107). The lower rear limit block (5) is fixedly connected to the base plate (1), and the lower rear limit block (5) can be inserted into the middle nail head groove (108) recessed inward on the outer wall of the rear side facade (104) of the thin-walled machine cover (100) with a gap. The upper end face of the lower rear limit block (5) abuts against the bottom surface of the middle nail head groove (108). A cylindrical baffle (6) is fixedly connected to the right end of the base plate (1), and the cylindrical baffle (6) is in contact with the right end facade (105) of the thin-walled machine cover (100). The rear fixing block (7) is fixedly connected to the rear end of the base plate (1). The front side of the rear fixing block (7) is provided with two sets of external guide holes (71). Each set of external guide holes (71) consists of two holes and the axial direction is along the front and rear direction. The total number of external guide holes (71) is four. Two flexible abutment blocks (8) are located in front of the rear fixing block (7) and on the left and right sides of the rear lower limit block (5), respectively. Each flexible abutment block (8) has an inner guide hole (81) on its rear side corresponding to two outer guide holes (71). Four guide sleeves (9) are provided, which are slidably engaged with the corresponding outer guide hole (71) and inner guide hole (81), respectively. Four springs (10) are placed in four guide sleeves (9), and the two ends of each spring (10) abut against the bottom wall of the corresponding outer guide hole (71) and the bottom wall of the corresponding inner guide hole (81). Two drive rods (11) are arranged in the front-rear direction. The front end of each drive rod (11) passes through the rear fixing block (7) and is fixedly connected to a flexible abutment block (8).

2. The flexible fixture for processing thin-walled machine covers according to claim 1, characterized in that, It also includes a drive cylinder (12) and a connecting rod (13); the drive cylinder (12) is fixedly connected to the rear side of the rear fixed block (7), and its piston rod is fixedly connected to the middle of the connecting rod (13). The length of the connecting rod (13) is along the left-right direction, and its left and right ends are respectively provided with through holes (131) in the front-back direction; the drive rod (11) is clearance-fitted with the through hole (131), its front end is screwed to the flexible abutment block (8), and its rear end is fixedly connected with a nail head (111). The outer diameter of the nail head (111) is larger than the inner diameter of the through hole (131); when the driving cylinder (12) is inflated, its piston rod drives the connecting rod (13) to move backward, thereby driving the flexible abutment block (8) to move closer to the rear fixing block (7) so as to put the thin-walled machine cover (100); when the driving cylinder (12) is slowly deflated, the flexible abutment block (8) moves slowly forward under the elastic action of the spring (10) until it abuts the outer wall of the rear side facade (104) of the thin-walled machine cover (100).

3. The flexible fixture for processing thin-walled machine covers according to claim 1, characterized in that, It also includes a left fixing block (14), two guide rods (15) and two springs (16); the left fixing block (14) is fixedly connected to the left end of the base plate (1), and the two guide rods (15) are fixedly connected to the upper end face of the left fixing block (14) and extend in the vertical direction; each guide rod (15) is fitted with a spring (16), the lower end of the spring (16) abuts against the upper end face of the left fixing block (14), and the upper end elastically abuts against the lower surface of the left end plane (102) of the thin-walled machine cover (100).

4. The flexible fixture for processing thin-walled machine covers according to claim 1, characterized in that, The left and right lengths of the auxiliary support plate (2) are 70%-90% of the inner contour length of the assembly joint surface (101) of the thin-walled cover (100).

5. The flexible fixture for processing thin-walled machine covers according to claim 1, characterized in that, The lower surface of the auxiliary support plate (2) is fixed with multiple reinforcing ribs extending in the front-back direction.

6. The flexible fixture for processing thin-walled machine covers according to claim 1, characterized in that, The auxiliary support plate (2) has at least one weight-reducing hole (21).

7. The flexible fixture for processing thin-walled machine covers according to claim 1, characterized in that, The auxiliary support plate (2) has rounded corners at its four corners and the radius of the rounded corners is 2-5mm.

8. The flexible fixture for processing thin-walled machine covers according to claim 1, characterized in that, The lower end of the cylindrical stop (6) is integrally formed with a screw rod, and the right end of the base plate (1) is provided with a threaded hole corresponding to the position of the screw rod. The screw rod and the threaded hole are threaded together to realize the fixed connection between the cylindrical stop (6) and the base plate (1). The middle part of the cylindrical stop (6) has two opposing torsion grooves (61) along its radial direction. The groove depth of the two torsion grooves (61) penetrates the radial section of the cylindrical stop (6), and the groove width is adapted to the size of the wrench jaws. It is used to adjust the installation height or tightness of the cylindrical stop (6) by twisting it with a wrench.

9. The flexible fixture for processing thin-walled machine covers according to claim 1, characterized in that, The flexible abutment block (8) has multiple linear grooves on its front side. The multiple linear grooves extend in the left and right direction and are distributed at intervals in the front and back direction. The linear grooves are used to increase the friction between the front side of the flexible abutment block (8) and the outer wall of the rear side facade (104) of the thin-walled machine cover (100) to prevent the thin-walled machine cover (100) from shifting in the left and right direction after clamping.

Images