Clamp for flattening end face of thin-wall shell part

Abstract

The invention relates to the technical field of machining, in particular to a thin-wall shell part flat end face clamp which comprises a positioning assembly, a clamping assembly and a clamping assembly. And the plurality of holding mechanisms are arranged on the positioning part and are used for holding the annular process table on the inner wall of the workpiece. The positioning assembly comprises a base disc used for being installed on a faceplate of a lathe spindle; the core shaft is vertically mounted in the center of one end surface of the base disc; the auxiliary supporting frame is installed on the side face of the mandrel and used for being supported on the inner surface of a workpiece; the first top disc is mounted at the end part of the core shaft, and the base disc and the first top disc are respectively positioned at two ends of the core shaft; the second top disc is used for being matched with a live center of a lathe tailstock, and the second top disc and the first top disc are used for being clamped on the two side faces of the bottom wall of the workpiece. Error compensation assemblies are installed on a radial sliding assembly and an outer side sliding assembly of the enclasping mechanism correspondingly and used for being clamped on the two side faces of the annular process table.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a clamp for a flat end surface of a thin-walled shell part. Background Art

[0002] Combine Figure 1 As shown in the figure, when turning the end face B of a thin-walled shell part, it is necessary to ensure that the parallelism between the machined surface and the inner wall surface A of the bottom of the thin-walled part is within the required tolerance range. Therefore, during the workpiece clamping process, the workpiece positioning surface should be located on the outside of the bottom of the thin-walled part. That is, the outer side surface of the bottom of the thin-walled part should be against the base D connected to the lathe spindle, and the lathe tailstock should be used to press the A surface to turn the B surface. Because the bottom wall of the thin-walled part serves as both the positioning surface and the clamping surface, it is far away from the end face B to be turned, and there is a weak force transmission area C in the middle composed of thin walls. The strength during machining is poor, and the tool chattering often occurs, affecting the part qualification rate. Figure 1 The workpiece in the middle is a 1 / 4 cross-sectional structural diagram.

[0003] The general approach to addressing poor machining strength is to provide some support to the workpiece to increase overall machining strength. However, due to the presence of weak force transmission areas, using external clamps or internal supports on the outer or inner walls of the workpiece cannot provide support while also applying additional load to the weak force transmission areas, causing workpiece deformation.

[0004] Combine Figure 2 As shown, in existing machining methods, a tailstock is used to press the bottom of the workpiece onto a base D connected to the lathe spindle. Rubber putty is then pressed into the workpiece's inner cavity and compacted before face turning. During turning, the cutting force is transmitted to the workpiece's bottom. In weak areas of force transmission, some vibration is absorbed by the rubber putty, providing a certain degree of strength. This method improves machining strength to a certain extent, but the rubber putty itself is weak, and the overall strength it can provide is limited.

[0005] To this end, it is necessary to design a fixture for the flat end face of a thin-walled shell part to provide support near the end face B of the workpiece while completing the positioning of the bottom of the workpiece to improve the strength during processing. Summary of the Invention

[0006] The main purpose of the present invention is to provide a fixture for the flat end surface of a thin-walled shell part, aiming to solve the above technical problems.

[0007] To achieve the above-mentioned object, the present invention provides a fixture for fixing the flat end surface of a thin-walled shell part, comprising:

[0008] A positioning component for determining the machining posture of the workpiece; and

[0009] A plurality of clamping mechanisms are arranged on the positioning part and are used for clamping the annular process table on the inner wall of the workpiece.

[0010] Preferably, the positioning component includes:

[0011] A base plate, for mounting on the faceplate of the lathe spindle;

[0012] a core shaft, vertically mounted at the center of one end surface of the base plate;

[0013] an auxiliary support frame, mounted on the side of the core shaft and used for supporting the inner surface of the workpiece;

[0014] A first top plate is mounted on the end of the core shaft, and the base plate and the first top plate are respectively located at two ends of the core shaft;

[0015] The second top plate is used to cooperate with the rotary center of the lathe tailstock and is used to clamp the first top plate on both side surfaces of the bottom wall of the workpiece.

[0016] Preferably, the number of the clamping mechanisms is three, which are evenly distributed along the circumference of the core shaft; each of the clamping mechanisms includes an outer sliding component and an inner sliding component slidably mounted on the core shaft; a driving screw is installed between the outer sliding component and the inner sliding component, which is used to drive the outer sliding component and the inner sliding component to move closer to or away from each other; a radial sliding component is slidably mounted on the inner sliding component; the radial sliding component and the outer sliding component are connected by a connecting rod mechanism, which is used to drive the radial sliding component to slide in the radial direction; error compensation components are respectively installed on the radial sliding component and the outer sliding component, which are used to clamp on both side surfaces of the annular process table.

[0017] Preferably, three first T-slots are provided on the outer circumferential surface of the core shaft; the first T-slots are parallel to the axis of the core shaft; the outer sliding assembly includes an outer slider and an outer slider back plate; the bottom surface of the outer slider is provided with a rectangular boss that slides with the first T-slot, the outer slider back plate is slidably installed in the first T-slot, and the outer slider back plate and the outer slider are connected by screws; the inner sliding assembly includes an inner slider and an inner slider back plate, and a guide block and a drive block are installed on the inner slider; the bottom surface of the inner slider is provided with a rectangular boss that slides with the first T-slot, the inner slider back plate is slidably installed in the first T-slot, and the inner slider back plate and the inner slider are connected by screws; the driving screw passes through the vertical plate of the outer slider and is threadedly engaged with the driving block.

[0018] Preferably, a vertical second T-slot is provided on the guide rail block; the radial sliding assembly includes a radial slider and a radial back plate; a rectangular boss is provided on the vertical surface of the radial slider, which slides with the second T-slot; the radial back plate is slidably installed in the second T-slot; the radial slider and the radial back plate are connected by screws.

[0019] Preferably, the connecting rod mechanism includes a radial slider bracket, an outer slider bracket and a push rod; the radial slider bracket is installed on the radial slider; the outer slider bracket is installed on the vertical plate of the outer slider; the two ends of the push rod are respectively hinged to the radial slider bracket and the outer slider bracket through pins.

[0020] Preferably, the error compensation assembly includes a fitting block, a steel ball and a fixed block; the fitting block is provided with a tightening boss for tightening on the side of the annular process table; the fitting block and the fixed block are both provided with a hemispherical groove, the steel ball is placed in the hemispherical groove, and the fitting block can rotate around the steel ball.

[0021] Preferably, the fitting block and the fixed block are connected by two first screws; the first screws pass through the through hole of the fixed block and are threadedly connected to the fitting block; there is a gap between the first screw and the through hole of the fixed block, and there is a gap between the shoulder of the first screw and the fixed block; there is a gap between the fitting block and the plane opposite to the fixed block.

[0022] Preferably, a fixed back plate is provided in the second T-slot; the inner slider and the guide rail block are fastened together by two second screws; the second screws pass through the inner slider and the guide rail block and are then screwed onto the fixed back plate.

[0023] Preferably, a first stop block is provided at one end of the first T-slot, and a second stop block is provided at the other end.

[0024] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0025] (1) In the fixture provided in the present invention, a clamping mechanism is provided, and when the workpiece is clamped, the clamping mechanism clamps the annular process table on the inner wall of the workpiece, which significantly enhances the strength of the workpiece during the processing and reduces the vibration during the processing, thereby helping to improve the processing efficiency and quality.

[0026] (2) In the present invention, the clamping mechanism is integrally slidably mounted on the core shaft. During the clamping process, the overall position of the clamping mechanism can be automatically adjusted by contact with the two end surfaces of the annular process table to avoid axial extrusion or stretching of the workpiece, thereby effectively preventing deformation of the workpiece.

[0027] (3) In the present invention, error compensation components are respectively installed on the radial sliding component and the outer sliding component for clamping on the two side surfaces of the annular process table. Since the bonding block in the error compensation component can make omnidirectional fine rotation around the center of the steel ball relative to the fixed block, it can automatically adapt to the angular error between the two side walls of the annular process table and the inner wall surface A of the bottom of the thin-walled part during the bonding process, and the three clamping mechanisms jointly lock the freedom degree when finally clamped to compensate for the non-parallelism between the side wall of the annular process table of the workpiece and the bottom end surface of the workpiece in the positioning state, thereby avoiding applying additional torsional load to the thin-walled part during the clamping process.

[0028] (4) In the present invention, when the clamping mechanism is in the non-clamping state, the radial sliding assembly is away from the workpiece annular process table, which facilitates the smooth loading and unloading of the workpiece, reduces the clamping and disassembly time, and is conducive to improving production efficiency.

[0029] (5) In the present invention, there are three clamping mechanisms, which are evenly distributed along the circumference of the core shaft. When the workpiece is clamped, three clamping points are formed to evenly distribute the clamping force, further enhancing the stability of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of clamping when turning the end face B of a thin-walled shell part in the existing processing scheme;

[0032] Figure 2 This is a clamping diagram when turning the end face B of a thin-walled shell part in the existing processing scheme;

[0033] Figure 3 A schematic diagram of the fixture provided by the present invention;

[0034] Figure 4 is a schematic diagram of a positioning component in the present invention;

[0035] Figure 5 An exploded view of the positioning assembly in the present invention;

[0036] Figure 6 For the assembly of the holding mechanism in the present invention Figure 1 ;

[0037] Figure 7 Schematic diagram of the structure of the outer sliding component and the error compensation component in the present invention;

[0038] Figure 8 Schematic diagram of the structure of the error compensation component in the present invention;

[0039] Figure 9 An exploded view of the outer sliding assembly and the error compensation assembly of the present invention;

[0040] Figure 10 It is an assembly diagram of the inner sliding assembly, radial sliding assembly and error compensation assembly in the present invention;

[0041] Figure 11 It is an assembly diagram of the radial sliding assembly and the error compensation assembly in the present invention;

[0042] Figure 12 An exploded view of the inner sliding assembly, radial sliding assembly, and error compensation assembly of the present invention;

[0043] Figure 13 A cross-sectional view of the inner sliding assembly, radial sliding assembly, and error compensation assembly of the present invention;

[0044] Figure 14 For the assembly of the holding mechanism in the present invention Figure 2 ;

[0045] Figure 15 It is a motion diagram of the clamping mechanism in the present invention.

[0046] Figure 16 This is a schematic diagram of the assembly of the fixture and machine tool provided by the present invention;

[0047] Figure 17 This is a schematic diagram of the fixture provided by the present invention positioning a workpiece;

[0048] Figure 18 This is a schematic diagram of the clamp provided by the present invention clamping a workpiece.

[0049] Explanation of the accompanying symbols: 1. Positioning assembly; 2. Clamping mechanism; 3. Base plate; 4. Mandrel; 4a. First T-slot; 5. Auxiliary support frame; 6. First top plate; 7. First stop block; 8. Second stop block; 9. Second top plate; 10. Outer sliding assembly; 11. Connecting rod mechanism; 12. Inner sliding assembly; 13. Error compensation assembly; 14. Outer slider; 15. Outer slider back plate; 16. Outer slider bracket; 17. Fitting block; 17a. Tightening boss ; 18. Steel ball; 19. Fixed block; 20. First screw; 21. Radial sliding assembly; 22. Radial back plate; 23. Radial slider bracket; 24. Radial slider; 25. Fixed back plate; 26. Guide rail block; 26a. Second T-slot; 27. Inner slider; 28. Inner slider back plate; 29. ​​Drive block; 30. Pin; 31. Push rod; 32. Drive screw; 32a. Screw head; 33. Shaft retaining ring; 34. Second screw; 100. Annular process table. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0051] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0052] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0053] Combine Figures 3 to 15 As shown, a fixture for the flat end surface of a thin-walled shell part includes:

[0054] Positioning component 1, used to determine the machining posture of the workpiece; and

[0055] A plurality of clamping mechanisms 2 are provided on the positioning portion 1 for clamping the annular process table 100 on the inner wall of the workpiece to enhance the processing strength of the thin-walled shell workpiece. The positioning assembly 1 provides an installation location for the clamping mechanisms 2.

[0056] Combine Figure 4 and Figure 5 As shown, the positioning component 1 includes:

[0057] The base plate 3 is used to be mounted on the faceplate of the lathe spindle;

[0058] The core shaft 4 is vertically mounted at the center of one end surface of the base plate 3; the core shaft 4 is connected to the base plate 3 by screws;

[0059] An auxiliary support frame 5 is mounted on the side of the core shaft 4 and is used to support the inner surface of the workpiece; the auxiliary support frame 5 is L-shaped, one arm of the auxiliary support frame 5 is parallel to the core shaft 4 and is mounted on the core shaft 4 by screws, and the other arm is arranged along the radial direction;

[0060] The first top plate 6 is mounted on the end of the core shaft 4 by screws, and the base plate 3 and the first top plate 6 are respectively located at the two ends of the core shaft 4;

[0061] The second top plate 9 is used to cooperate with the rotary center of the lathe tailstock and is used to clamp the first top plate 6 on both sides of the bottom wall of the workpiece.

[0062] Combine Figures 6 to 15 As shown, there are three clamping mechanisms 2 , which are evenly distributed along the circumference of the core shaft 4 .

[0063] Each of the clamping mechanisms 2 includes an outer sliding component 10 and an inner sliding component 12 slidably mounted on the core shaft 4; a driving screw 32 is installed between the outer sliding component 10 and the inner sliding component 12, which is used to drive the outer sliding component 10 and the inner sliding component 12 to move closer to or away from each other; a radial sliding component 21 is slidably mounted on the inner sliding component 12; the radial sliding component 21 is connected to the outer sliding component 10 through a connecting rod mechanism 11, which is used to drive the radial sliding component 21 to slide in the radial direction; error compensation components 13 are respectively installed on the radial sliding component 21 and the outer sliding component 10, which are used to clamp on both side surfaces of the annular process table 100.

[0064] Specifically, when the rotating drive screw 32 drives the outer sliding assembly 10 and the inner sliding assembly 12 to move closer to each other, the connecting rod mechanism 11 drives the radial sliding assembly 21 to move radially outward, and the two error compensation assemblies 13 are clamped on the two side surfaces of the annular process table 100.

[0065] When the driving screw 32 is rotated to drive the outer sliding assembly 10 and the inner sliding assembly 12 away from each other, the connecting rod mechanism 11 drives the radial sliding assembly 21 to move radially inward, and the two error compensation assemblies 13 release the annular process table 100 .

[0066] Combine Figure 5 As shown, three first T-slots 4 a are provided on the outer circumference of the core shaft 4 ; the first T-slots 4 a are parallel to the axis of the core shaft 4 .

[0067] Combine Figures 6 to 9 As shown, the outer sliding assembly 10 includes an outer slider 14 and an outer slider back plate 15; the bottom surface of the outer slider 14 is provided with a rectangular boss that slides with the first T-slot 4a, and the outer slider back plate 15 is slidably installed in the first T-slot 4a, and the outer slider back plate 15 is connected to the outer slider 14 by screws to achieve the purpose of sliding the outer slider 14 on the core shaft 4.

[0068] Combine Figures 10 to 13 As shown, the inner sliding assembly 12 includes an inner slider 27 and an inner slider back plate 28, and a guide block 26 and a drive block 29 are installed on the inner slider 27; the bottom surface of the inner slider 27 is provided with a rectangular boss that slides with the first T-slot 4a, and the inner slider back plate 28 is slidably installed in the first T-slot 4a, and the inner slider back plate 28 is connected to the inner slider 27 by screws to achieve the purpose of the inner slider 27 sliding on the core shaft 4.

[0069] Combine Figure 14 As shown, the drive screw 32 passes through the vertical plate of the outer slider 14 and then engages with the drive block 29. A shaft retaining spring 33 is secured to the drive screw 32. The shaft retaining spring 33 fits within the retaining spring groove of the drive screw 32 and, together with the screw head 32a, forms a retaining structure that limits the axial position of the drive screw 32 on the outer slider 14. In other words, the drive screw 32 can rotate about its axis within the through-hole of the vertical plate of the outer slider 14, but cannot move axially. A hexagonal countersunk hole is provided on the end face of the screw head 32a to facilitate the use of an Allen wrench to twist the drive screw 32.

[0070] Combine Figure 10 and Figure 11 As shown, a vertical second T-slot 26a is provided on the guide rail block 26; the radial sliding assembly 21 includes a radial slider 24 and a radial back plate 22; a rectangular boss is provided on the vertical surface of the radial slider 24, which slides with the second T-slot 26a; the radial back plate 22 is slidably installed in the second T-slot 26a; the radial slider 24 and the radial back plate 22 are connected by screws.

[0071] Combine Figure 14 As shown, the connecting rod mechanism 11 includes a radial slider bracket 23, an outer slider bracket 16 and a push rod 31; the radial slider bracket 23 is mounted on the radial slider 24 by screws; the outer slider bracket 16 is mounted on the vertical plate of the outer slider 14 by screws; the two ends of the push rod 31 are respectively hinged to the radial slider bracket 23 and the outer slider bracket 16 by a pin shaft 30.

[0072] Combine Figure 15 The diagram shows the movement of the clamping mechanism 2. When the driving screw 32 is rotated to drive the outer sliding assembly 10 and the inner sliding assembly 12 to move closer to each other, the push rod 31 drives the radial sliding assembly 21 to move radially outward.

[0073] When the rotating drive screw 32 drives the outer sliding assembly 10 and the inner sliding assembly 12 away from each other, the radial sliding assembly 21 is driven to move radially inward under the action of the push rod 31 until the radial back plate 22 located on the radial sliding assembly 21 abuts against the fixed back plate 25, and the distance stroke ends.

[0074] Combine Figure 5 As shown, the push rod 31 always has an angle β with the horizontal direction, and the radial sliding component 21 will not fall to β=0, so as to avoid the link mechanism 11 from having a dead point in motion.

[0075] Combine Figure 8 As shown, the error compensation assembly 13 includes a fitting block 17, a steel ball 18 and a fixed block 19; a tightening boss 17a is provided on the fitting block 17 for tightening on the side of the annular process table 100; the fitting block 17 and the fixed block 19 are both provided with a hemispherical groove, the steel ball 18 is placed in the hemispherical groove, and the fitting block 17 can rotate around the steel ball 18. Specifically, the fitting block 17 and the fixed block 19 are connected by two first screws 20; the first screw 20 passes through the through hole of the fixed block 19 and is threadedly connected to the fitting block 17; there is a gap between the first screw 20 and the through hole of the fixed block 19, and there is a gap between the shoulder of the first screw 20 and the fixed block 19; there is a gap between the planes where the fitting block 17 and the fixed block 19 are connected. Figure 8In the figure, E represents the gap between the first screw 20 and the through-hole of the fixing block 19; F represents the gap between the shoulder of the first screw 20 and the fixing block 19; and G represents the gap between the planes of the fitting block 17 and the fixing block 19. The gaps at E, F, and G are no less than 3 mm. In the clamped state, the tightening boss 17a of the fitting block 17 of the error compensation assembly 13 fits tightly against the side wall of the annular process table 100. The fitting block 17 can make subtle omnidirectional rotations relative to the fixing block 19 around the center of the steel ball 18 to compensate for the angle caused by the non-parallelism between the annular process table 100 and the bottom wall of the workpiece in the positioning state.

[0076] In the same clamping mechanism 2 , the fixing block 19 on one error compensation component 13 is fastened to the vertical plate of the outer slider 14 by screws, and the fixing block 19 on the other error compensation component 13 is fastened to the radial slider 24 by screws.

[0077] Combine Figure 12 、 Figure 13 As shown, a fixed back plate 25 is provided in the second T-slot 26a; the inner slider 27 and the guide rail block 26 are fastened together by two second screws 34; the second screws 34 pass through the inner slider 27 and the guide rail block 26 and are then tightened onto the fixed back plate 25.

[0078] Combine Figure 4 and Figure 5 As shown, a first stop block 7 is provided at one end of the first T-slot 4a, and a second stop block 8 is provided at the other end, for preventing the clamping mechanism 2 from slipping out of the first T-slot 4a.

[0079] When preparing the workpiece, an annular process table 100 is machined into the inner wall of the workpiece. Figures 16 to 18 As shown, this embodiment also provides a method for flattening the end surface of a thin-walled shell part. When turning the end surface B, the above-mentioned fixture is used, including the following steps:

[0080] S1. Install the fixture on the lathe: install the base plate 3 on the fixture on the lathe spindle faceplate through the pressure plate kit, and install the second top plate 9 on the fixture on the rotary center of the lathe tailstock.

[0081] S2. Positioning and clamping the workpiece: Manually align the workpiece opening direction with the direction of the core shaft 4, and put the workpiece on the auxiliary support frame 5 so that the end of the auxiliary support frame 5 rests on the inner surface of the workpiece opening. Start the forward feed of the tailstock of the machine tool, so that the second top plate 9 is close to the first top plate 6, and gradually press the bottom wall of the workpiece to complete the workpiece positioning and achieve Figure 17 Status shown.

[0082] S3. The annular process table 100 holding the workpiece tightly: After the workpiece positioning is completed, the annular process table 100 needs to hold the workpiece tightly to enhance the strength when the end face B is turned.

[0083] S4. Turning: Start the lathe to turn the end face B of the workpiece.

[0084] S5. Disassembly after processing: Release the clamping mechanism 2, start the reverse feed of the machine tailstock, and take out the processed workpiece.

[0085] Specifically, if Figure 15 The diagram shows the movement of the clamping mechanism 2, combined with Figure 6 、 Figure 7 、 Figure 10 as well as Figure 14 As shown, in the initial state, the outer sliding assembly 10 is far away from the inner sliding assembly 12, and the radial sliding assembly 21 is close to the core shaft 4. Use the hexagonal wrench to twist the drive screw 32, and the threaded section of the drive screw 32 drives the drive block 29 to move the outer sliding assembly 10 and the inner sliding assembly 12 closer to each other. As the distance between the outer sliding assembly 10 and the inner sliding assembly 12 gradually decreases, the push rod 31 rotates clockwise relative to the pin 30 on the outer slider bracket 16, and pushes the radial sliding assembly 21 radially away from the core shaft 4. When the angle of the push rod 31 relative to the core shaft 4 approaches 90 degrees, the radial sliding assembly 21 approaches the apex and no longer moves radially. At the same time, the radial sliding assembly 21 and the bonding blocks 17 of the error compensation device 13 on the outer sliding assembly 10 contact the side walls of the annular process table 100 inside the workpiece. When the driving screw 32 continues to rotate, the bonding blocks 17 on the two error compensation devices 13 hold the annular process table 100 of the workpiece tightly. When the side walls of the annular process table 100 inside the workpiece are not parallel to the bottom wall of the workpiece, the bonding blocks 17 will automatically rotate around the center of the steel ball 18 by a certain angle to compensate for the non-parallelism between the side walls of the annular process table 100 of the workpiece and the bottom wall of the workpiece.

[0086] Use the hexagon socket screws to tighten the two screws connecting the outer slider 14 and the outer slider back plate 15, so that the outer slider 14 and the outer slider back plate 15 generate a large static friction force on the core shaft 4, so that the clamping mechanism 2 as a whole will not move relative to the core shaft 4, and the clamping work of one clamping mechanism 2 is completed. The clamping process of the remaining two clamping mechanisms 2 is completed in the same way. When the three clamping mechanisms 2 are fully clamped, the degree of freedom of the error compensation device 13 is 0. Figure 18 Status shown.

[0087] When the lathe is started to turn the end face B of the workpiece, most of the force on the workpiece generated during turning will be borne by the clamping mechanism 2.

[0088] After turning is completed, the drive screw 32 is twisted in the reverse direction, causing the radial slide assembly 21 to move radially toward the core shaft 4. At the same time, the outer slide assembly 10 and the inner slide assembly 12 move away from each other. When the radial back plate 22 of the radial slide assembly 21 is stopped by the fixed back plate 25 in the guide rail 26, the radial slide assembly 21 no longer moves radially inward. The machine tailstock is started to feed in reverse, and when the second top plate 9 is spaced sufficiently apart from the first top plate 6, the machined workpiece is removed.

[0089] Combine Figure 17 As shown, in the non-clamping state of the clamping mechanism 2 , the radial sliding assembly 21 of the inner sliding assembly 12 is away from the annular process table 100 of the workpiece, so as to facilitate smooth disassembly and assembly of the workpiece.

[0090] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A fixture for the flat end surface of a thin-walled shell part, characterized in that: include: A positioning component (1) for determining a machining posture of a workpiece; as well as A plurality of clamping mechanisms (2) are arranged on the positioning portion (1) and are used to clamp the annular process table (100) on the inner wall of the workpiece.

2. The clamp according to claim 1, wherein The positioning assembly (1) comprises: A base plate (3) for mounting on a faceplate of a lathe spindle; A core shaft (4) is vertically mounted at the center of one end surface of the base plate (3); An auxiliary support frame (5) is mounted on the side of the core shaft (4) and is used to support the inner surface of the workpiece; A first top plate (6) is mounted on the end of the core shaft (4), and the base plate (3) and the first top plate (6) are respectively located at two ends of the core shaft (4); The second top plate (9) is used to cooperate with the rotary top of the lathe tailstock and is used together with the first top plate (6) to be clamped on both side surfaces of the bottom wall of the workpiece.

3. The clamp according to claim 2, wherein: The number of the clamping mechanisms (2) is three, and they are evenly distributed along the circumference of the core shaft (4); Each of the clamping mechanisms (2) comprises an outer sliding assembly (10) and an inner sliding assembly (12) slidably mounted on the core shaft (4); A driving screw (32) is installed between the outer sliding assembly (10) and the inner sliding assembly (12) for driving the outer sliding assembly (10) and the inner sliding assembly (12) to move closer to or away from each other; A radial sliding assembly (21) is slidably mounted on the inner sliding assembly (12); the radial sliding assembly (21) is connected to the outer sliding assembly (10) via a connecting rod mechanism (11) for driving the radial sliding assembly (21) to slide in the radial direction; Error compensation components (13) are respectively installed on the radial sliding component (21) and the outer sliding component (10) for clamping on both side surfaces of the annular process table (100).

4. The clamp according to claim 3, wherein Three first T-shaped slots (4a) are provided on the outer peripheral surface of the core shaft (4); the first T-shaped slots (4a) are parallel to the axis of the core shaft (4); The outer sliding assembly (10) includes an outer sliding block (14) and an outer sliding block back plate (15); the bottom surface of the outer sliding block (14) is provided with a rectangular boss that slides with the first T-shaped slot (4a); the outer sliding block back plate (15) is slidably installed in the first T-shaped slot (4a), and the outer sliding block back plate (15) and the outer sliding block (14) are connected by screws; The inner sliding assembly (12) includes an inner slider (27) and an inner slider back plate (28), and a guide block (26) and a driving block (29) are installed on the inner slider (27); a rectangular boss is provided on the bottom surface of the inner slider (27) and is slidably matched with the first T-slot (4a); the inner slider back plate (28) is slidably installed in the first T-slot (4a), and the inner slider back plate (28) and the inner slider (27) are connected by screws; The driving screw (32) passes through the vertical plate of the outer sliding block (14) and is threadedly engaged with the driving block (29).

5. The clamp according to claim 4, wherein: A vertical second T-shaped slot (26a) is provided on the guide rail block (26); The radial sliding assembly (21) comprises a radial slider (24) and a radial back plate (22); a rectangular boss is provided on the vertical surface of the radial slider (24) and is slidably engaged with the second T-slot (26a); the radial back plate (22) is slidably installed in the second T-slot (26a); the radial slider (24) and the radial back plate (22) are connected by screws.

6. The clamp according to claim 5, wherein: The connecting rod mechanism (11) comprises a radial slider bracket (23), an outer slider bracket (16) and a push rod (31); The radial slider bracket (23) is mounted on the radial slider (24); The outer slider bracket (16) is mounted on the vertical plate of the outer slider (14); The two ends of the push rod (31) are respectively hinged to the radial slider bracket (23) and the outer slider bracket (16) through a pin shaft (30).

7. The clamp according to claim 3, wherein: The error compensation assembly (13) comprises a fitting block (17), a steel ball (18) and a fixing block (19); a tightening boss (17a) is provided on the fitting block (17) for tightening against the side surface of the annular process table (100); The fitting block (17) and the fixing block (19) are both provided with a hemispherical groove, the steel ball (18) is placed in the hemispherical groove, and the fitting block (17) can rotate around the steel ball (18).

8. The clamp according to claim 7, wherein: The fitting block (17) and the fixed block (19) are connected by two first screws (20); the first screws (20) pass through the through holes of the fixed block (19) and are threadedly connected to the fitting block (17); there is a gap between the first screws (20) and the through holes of the fixed block (19), and there is a gap between the shaft shoulders of the first screws (20) and the fixed block (19); and there is a gap between the planes where the fitting block (17) and the fixed block (19) are in contact.

9. The clamp according to claim 5, wherein: A fixed back plate (25) is provided in the second T-slot (26a); the inner slide block (27) and the guide rail block (26) are fastened together by two second screws (34); The second screw (34) passes through the inner slide block (27) and the guide rail block (26) and is then screwed onto the fixed back plate (25).

10. The clamp according to claim 4, wherein: A first stop block (7) is provided at one end of the first T-shaped slot (4a), and a second stop block (8) is provided at the other end.

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