Fixture and clamping method for clamping cylinder assembly

Abstract

The present invention discloses a fixture for a clamping cylinder assembly, which includes a mandrel. The two ends of the mandrel are respectively provided with a first positioning component and a second positioning component, and the mandrel has an axial limiting structure for restricting the axial distance between the two positioning components. The first positioning component axially positions and radially limits the first mounting edge. The second positioning component is used for axially pressing the second mounting edge so as to axially press the cylinder assembly onto the first positioning component. The second positioning component includes a pressing member for pressing on the second mounting edge and an adjusting member for adjusting the axial pressing force of the pressing member. The axial limiting structure of the mandrel keeps the two positioning components at a fixed axial distance. The lathe center is abutted against the mandrel, and the workpiece is pressed by the pressing member with a controllable axial pressing force and is not affected by the pressing force of the lathe, avoiding the compression of the corrugated cylinder due to the excessive axial pressing force of the lathe center and the rebound of the corrugated cylinder when the clamping is removed after processing, resulting in unqualified processing dimensions.

Description

Technical Field

[0001] The present invention relates to the technical field of engine component repair, and in particular, to a fixture for clamping a cylinder assembly. In addition, the present invention also relates to a clamping method for clamping a cylinder assembly including the above-mentioned fixture. Background Art

[0002] After an aeroengine has been used for a service life, it needs to be sent back to the factory for repair. After the cylinder assembly is used with the engine, the mounting surface has varying degrees of deformation. If it fails the dimensional inspection, it needs to be repaired.

[0003] As Figure 1 shown, the cylinder assembly is a thin-walled long cylinder workpiece, which includes a first mounting edge 1, a tapered cylinder part 2, a corrugated cylinder part 3, and a second mounting edge 4 connected in sequence from the first end to the second end. The corrugated cylinder part 3 acts as a buffer like a spring during the assembly process of the engine. During the use of the engine, under the action of vibration and different thermal expansions between workpieces, the axial distance changes. The corrugated cylinder limits the axial displacement through buffering to ensure the assembly gap between workpieces.

[0004] The relevant dimensions and geometric tolerances on each mounting edge of the cylinder assembly cannot be ensured by compressing the corrugated cylinder during the part processing. Otherwise, when thermal expansion occurs, the force compressed in the early stage will be released, resulting in unqualified dimensions, affecting the assembly gap, and in severe cases, causing cracks in the workpiece.

[0005] The new parts have sufficient allowance from rough machining to finished products, but the repaired parts are usually machined with small allowances, and the actual deformation conditions of each repaired part are different. This makes the pressing plate 13 of the existing lathe fixture that plays an auxiliary supporting and pressing role ineffective, and there are also problems such as uneven force application during pressing and fixing, resulting in failure to reduce the vibration of the workpiece during machining, thereby causing local deformation of the workpiece due to force, and secondly, after the workpiece is removed from the equipment after machining, the corrugated cylinder rebounds at the stressed part, resulting in unqualified dimensions. Summary of the Invention

[0006] The present invention provides a fixture and a clamping method for clamping a cylinder assembly to solve the technical problem that the excessive pressing force of the lathe center in the existing clamping method causes compression of the corrugated cylinder, and the rebound of the stressed part of the corrugated cylinder after machining and removal results in unqualified dimensions.

[0007] The technical solution adopted by the present invention is as follows: A fixture for clamping a cylinder assembly is used to clamp the cylinder assembly to be fixed on a lathe for repair. The cylinder assembly includes a first mounting edge, a tapered cylinder part, a corrugated cylinder part, and a second mounting edge connected in sequence from the first end to the second end. The fixture includes a mandrel, a first positioning component, and a second positioning component;

[0008] The mandrel is used to connect with a lathe. The first positioning component and the second positioning component are respectively arranged at two ends of the mandrel. The first positioning component and the second positioning component are used to clamp the cylinder component at two ends of the cylinder component. The mandrel has an axial limiting structure for limiting the axial distance between the first positioning component and the second positioning component;

[0009] The first positioning component is used for axially positioning and radially limiting the first mounting edge;

[0010] The second positioning component is used for axially pressing the second mounting edge and then axially pressing the cylinder component onto the first positioning component; the second positioning component includes a pressing member for pressing on the second mounting edge and an adjusting member for adjusting the axial pressing force of the pressing member on the second mounting edge. The second positioning component is also used for radially limiting the second mounting edge.

[0011] As a preferred method, the axial limiting structure includes a first shoulder radially protruding from the outer wall of the mandrel and a second shoulder radially protruding from the outer wall of the mandrel;

[0012] The first shoulder is used to abut against the end face of the first positioning component after the first positioning component is sleeved on the first end of the mandrel;

[0013] The second shoulder is used to abut against the end face of the second positioning component after the second positioning component is sleeved on the second end of the mandrel.

[0014] As a preferred method, the first shoulder is provided with a through hole for passing a screw. The large end of the screw abuts against the end face of the first shoulder and the screw is threadedly connected with the first positioning component to axially position the first positioning component on the first shoulder; the second end of the mandrel has an external thread and is threadedly connected with a first nut. The first nut is used for pressing on the second positioning component to axially position the second positioning component on the second shoulder.

[0015] As a preferred method, the first positioning component includes a first positioning plate for sleeving on the mandrel and axially positioning on the mandrel. The first positioning plate is formed with an annular protrusion. The annular protrusion is used to abut against the outer end face of the first mounting edge to axially limit the cylinder component; a limiting protrusion is also protruded from the end face of the annular protrusion for cooperating with the inner ring face of the first mounting edge or the end hole of the first mounting edge to radially limit the first mounting edge.

[0016] As a preferred embodiment, the first positioning assembly further includes a pressing plate, and the height of the limiting protrusion is less than or equal to the thickness of the first mounting edge; the pressing plate is used for axially pressing against the inner end surface of the first mounting edge and abutting against the end surface of the limiting protrusion, and a second bolt passing through the pressing plate is threadedly connected to the first positioning plate. The large end of the second bolt axially presses against the end surface of the pressing plate, thereby pressing the pressing plate against the inner end surface of the first mounting edge.

[0017] As a preferred embodiment, the first positioning plate is provided with a first threaded hole for threadedly connecting with the second bolt inside the annular protrusion. The second bolt passes through the middle of the pressing plate, and the pressing plate is further provided with a second threaded hole with both ends communicating. A stud is threadedly connected to the second threaded hole; the stud is used for adjusting the relative position between its end and the pressing plate and abutting against the end surface of the first positioning plate, thereby adjusting the height on one side of the pressing plate to make the end surface of the pressing plate parallel to the inner end surface of the first mounting edge.

[0018] As a preferred embodiment, the second mounting edge has a stepped structure, and the stepped structure includes an annular end surface and an annular inner wall surface. The second positioning assembly includes a second positioning plate, and the adjusting member is axially position-adjustably connected to the second positioning plate. The first end surface of the pressing member abuts against the annular end surface. The pressing member has a second end surface opposite to the first end surface. One end of the adjusting member facing the pressing member has an angle adaptation structure, and the angle adaptation structure of the adjusting member abuts against the second end surface of the pressing member. The angle adaptation structure is used to make the adjusting member tilt relative to the second end surface of the pressing member when abutting against the pressing member, so as to make the second positioning assembly adapt to the deformation of the annular end surface.

[0019] As a preferred embodiment, the pressing member has an inner cavity, and the second end of the pressing member is provided with a third threaded hole communicating with the inner cavity;

[0020] The adjusting member is of a threaded rod structure. One end of the adjusting member facing the pressing member has a first threaded section, and the length of the first threaded section is adapted to the depth of the third threaded hole. The adjusting member has a movable shaft section connected to the first threaded section, and the shaft diameter of the movable shaft section is smaller than the aperture of the third threaded hole. The length of the movable shaft section is greater than the depth of the third threaded hole. The movable shaft section and the third threaded hole are used to cooperate to limit the tilting angle of the adjusting member relative to the second end surface of the pressing member;

[0021] The adjusting member has a second threaded section for threaded connection with the second positioning plate. A second nut is threadedly connected to the second threaded section. The second nut is used to be screwed into the second threaded section until it abuts against the end face of the second positioning plate, thereby restricting the rotation of the adjusting member to control the axial position of the adjusting member on the second positioning plate.

[0022] As a preferred embodiment, there are a plurality of the pressing members. The second positioning plate is axially provided with fourth threaded holes adapted to the second threaded section. The plurality of fourth threaded holes are evenly arranged circumferentially on the second positioning plate. The radial position of the fourth threaded holes on the second positioning plate is adapted to the radial dimension of the annular end face of the second mounting edge.

[0023] According to another aspect of the present invention, there is also provided a clamping method for a clamping cylinder assembly. Clamping is performed by any one of the above-mentioned jigs. The clamping method includes:

[0024] Position and assemble the first positioning assembly on the lathe chuck. The first end of the mandrel axially penetrates through the axial center position of the first positioning assembly. The axial limiting structures of the lathe chuck and the mandrel axially limit the two end faces of the first positioning assembly respectively, thereby realizing the axial positioning of the first positioning assembly.

[0025] Axially position and radially limit the first mounting edge of the cylinder assembly on the workpiece positioning structure of the first positioning assembly. At this time, the second end of the mandrel passes through the cylinder assembly.

[0026] Pass the second end of the mandrel through the axial center of the second positioning assembly. By means of the axial limiting structure of the mandrel, keep a fixed axial distance between the first positioning assembly and the second positioning assembly. The lathe center is abutted against the second end of the mandrel.

[0027] The present invention has the following beneficial effects: Position and assemble the first positioning assembly on the lathe chuck. The first end of the mandrel axially penetrates through the axial center position of the first positioning assembly. The axial limiting structures of the lathe chuck and the mandrel axially limit the two end faces of the first positioning assembly respectively, thereby realizing the axial positioning of the first positioning assembly. Axially position and radially limit the first mounting edge of the cylinder assembly on the workpiece positioning structure of the first positioning assembly. At this time, the second end of the mandrel passes through the cylinder assembly. Pass the second end of the mandrel through the axial center of the second positioning assembly. By means of the axial limiting structure of the mandrel, keep a fixed axial distance between the first positioning assembly and the second positioning assembly. The lathe center is abutted against the second end of the mandrel. One end of the cylinder assembly is positioned on the lathe chuck, and the other end is pressed by a pressing member with controllable axial pressing force, so that it does not need to be subjected to the pressing force of the lathe center, thereby avoiding the compression of the corrugated tube during the processing due to the excessive axial pressing force of the lathe center, and the springback of the corrugated tube when the clamping is removed after the processing of the cylinder assembly, resulting in unqualified processing dimensions.

[0028] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. Description of the Drawings

[0029] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0030] Figure 1 is a partial cross-sectional view of the clamping structure of the existing fixture;

[0031] Figure 2 is a partial cross-sectional view of the use state of the fixture according to the preferred embodiment of the present invention;

[0032] Figure 3 is Figure 2 a partial enlarged view of the positions of the adjusting member and the pressing member in

[0033] 1. First mounting edge; 2. Conical barrel member; 3. Corrugated barrel member; 4. Second mounting edge; C. Annular end face; 5. Base; 6. First bolt; 7. Support; 8. Plate member; 9. Pressing plate; 10. Mandrel; 101. First shoulder; 102. Second shoulder; 103. Screw; 104. Bushing; 105. First nut; 11. First positioning plate; 111. Annular protrusion; 112. Limit protrusion; 113. First threaded hole; 12. Second positioning plate; 121. Fourth threaded hole; 13. Pressing plate; 131. Second threaded hole; 14. Second bolt; 15. Stud; 16. Pressing member; 161. Inner cavity; 162. Third threaded hole; 17. Adjusting member; 171. Arc-shaped end face; 172. First threaded section; 173. Movable shaft section; 174. Second threaded section; 18. Second nut Detailed Embodiments

[0034] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0035] Referring to Figures 1 to 2 , a preferred embodiment of the present invention provides a fixture for clamping a cylinder assembly, which is used to clamp the cylinder assembly (hereinafter referred to as the workpiece) to be fixed on a lathe for repair. The first end to the second end of the workpiece includes a first mounting edge 1, a conical barrel member 2, a corrugated barrel member 3, and a second mounting edge 4 that are connected in sequence. The first mounting edge 1 has an annular radial surface, which includes an inner end face facing the inside of the workpiece and an outer end face facing the outside; the second mounting edge 4 has a stepped structure, and the stepped structure includes an annular end face and an annular inner wall surface;

[0036] The fixture includes a mandrel 10 arranged coaxially, a first positioning component, and a second positioning component;

[0037] The mandrel 10 is used to connect with a lathe. The first positioning component and the second positioning component are respectively arranged at both ends of the mandrel 10. The first positioning component and the second positioning component are used to clamp a cylinder component at both ends of the cylinder component. Before clamping, the mandrel 10 passes through the cylinder component. The mandrel 10 has an axial limiting structure for restricting the axial distance between the first positioning component and the second positioning component;

[0038] The first positioning component has a workpiece positioning structure for axially positioning and radially limiting the first mounting edge 1;

[0039] The second positioning component is used to axially press the second mounting edge 4 and thus axially press the cylinder component onto the first positioning component. The second positioning component is also used to radially limit the second mounting edge 4; The second positioning component includes a pressing member 16 and an adjusting member 17. The pressing member 16 is used to press on the second mounting edge 4, and the adjusting member 17 is used to adjust the axial pressing force of the pressing member 16 on the second mounting edge 4.

[0040] The working principle of this fixture: Position and assemble the first positioning component on the lathe chuck. The first end of the mandrel 10 axially passes through the center position of the first positioning component. The lathe chuck and the axial limiting structure of the mandrel 10 axially limit the two end faces of the first positioning component respectively to realize the axial positioning of the first positioning component. Axially position and radially limit the first mounting edge 1 of the cylinder component on the workpiece positioning structure of the first positioning component. At this time, the second end of the mandrel 10 passes through the workpiece. Pass the second end of the mandrel 10 through the center of the second positioning component. Through the axial limiting structure of the mandrel 10, keep a fixed axial distance between the first positioning component and the second positioning component. For the second positioning component, the lathe center drill presses against the second end of the mandrel 10. The workpiece is pressed by the pressing member 16 with a controllable axial pressing force and is not affected by the pressing force of the lathe. Thus, when the lathe feeds, the workpiece remains in a pressed state and is not affected by the machining chatter. At the same time, it avoids the machining size unqualified caused by the compression of the corrugated cylinder part 3 due to the excessive axial pressing force of the lathe center drill and the springback of the corrugated cylinder part 3 when the clamping is removed after machining.

[0041] Furthermore, the axial limiting structure of the mandrel 10 includes a first shoulder 101 radially protruding from the outer wall of the mandrel 10 and a second shoulder 102 radially protruding from the outer wall of the mandrel 10;

[0042] The first shoulder 101 is used to abut against the end face of the first positioning component after the first positioning component is sleeved on the first end of the mandrel 10; That is, during clamping, pass the first end of the mandrel 10 through the center of the first positioning component until the end face of the first positioning component abuts against the first shoulder 101; Among them, a bushing 104 is axially penetrated at the end of the first positioning component facing the lathe chuck for auxiliary positioning;

[0043] The second shaft shoulder 102 is used to abut against the end face of the second positioning component after the second positioning component is sleeved on the second end of the mandrel 10; similarly, during clamping, the second end of the mandrel 10 is passed through the axis of the second positioning component until the end face of the second positioning component abuts against the second shaft shoulder 102. The distance between the outer end faces of the two shaft shoulders is the axial distance between the two positioning components. The axial distance between the two positioning components is relatively fixed. By adjusting the axial relative position of the pressing member 16 through the adjusting member 17, the size of the repaired workpiece can be adapted and the axial pressing force on it can be adjusted.

[0044] Specifically, a through hole is axially formed in the first shaft shoulder 101 for passing through the screw 103. The large end of the screw 103 abuts against the end face of the first shaft shoulder 101, and the screw 103 is threadedly connected to the first positioning component to axially position the first positioning component; the second end of the mandrel 10 has an external thread and is threadedly connected with a first nut 105. The first nut 105 is threadedly connected to the mandrel 10 to press against the second positioning component, thereby axially positioning the second positioning component on the second shaft shoulder 102.

[0045] Reference Figure 1 , after the cylinder assembly in the prior art is used with the engine, it is necessary to inspect and repair the A surface and B surface of the second mounting edge 4 shown in the figure. As Figure 1 shown, when using the existing machining fixture for clamping, by positioning and fixing its base 5 to the lathe chuck, the workpiece is mounted on the base 5. The base 5 axially limits the outer end face of the first mounting edge 1. By adjusting the first bolt 6 and the support 7, the inner end face of the first mounting edge 1 of the workpiece is axially limited by the plate member 8 with barbs and the first mounting plate is radially limited. Then, the second mounting edge 4 of the workpiece is pressed by the pressing plate 9, and the pressing plate 9 is pressed by the center point of the lathe to complete the clamping. Since the first mounting edge 1 is the reference surface for the machining dimensions and geometric tolerances of the remaining surfaces, when the inner end face of the first mounting edge 1 is axially limited by the barb of the plate member 8, the outer end face of the first mounting edge 1 is in a suspended state without a supporting surface and is deformed by force. Moreover, if the plate member 8 is not in a horizontal plane when adjusting the first bolt 6 and the support 7, the pressing force on the first mounting edge 1 will be further increased in the inclined state. Therefore, the existing clamping structure will cause its deformation and affect the machining accuracy; in addition, when adjusting the height and pressing position of the plate member 8 by adjusting the first bolt 6 and the support 7, it is necessary to observe from the inside of the workpiece, and the adjustment and observation cannot be carried out simultaneously, which is inconvenient to operate.

[0046] The first positioning component of this embodiment includes a first positioning plate 11 for sleeving on the mandrel 10 and axially positioning on the mandrel 10. The workpiece positioning structure includes an annular protrusion 111 protruding from the end face of the first positioning plate 11. The annular protrusion 111 is used to abut against the outer end face of the first mounting edge 1 to axially limit the cylinder assembly; the workpiece positioning structure further includes a limiting protrusion 112 protruding from the end face of the annular protrusion 111, which is used to cooperate with the inner ring surface of the first mounting edge 1 or with the end hole of the first mounting edge 1 to radially limit the first mounting edge 1; it can be understood that the radial dimension of the outer ring surface of the annular protrusion 111 is greater than the radial dimension of the outer edge of the outer end face of the first mounting edge 1, and the radial dimension of the inner ring surface of the annular protrusion 111 is less than the radial dimension of the inner edge of the outer end face of the first mounting edge 1; the limiting protrusion 112 of this embodiment is preferably configured to cooperate with the inner ring surface of the first mounting edge 1, that is, the limiting protrusion 112 is annular, and the radial dimension of the outer ring surface of the limiting protrusion 112 is adapted to the radial dimension of the inner ring surface of the first mounting edge 1; in other embodiments, if it is set that the limiting protrusion 112 cooperates with the end hole of the first mounting edge 1, the limiting protrusion 112 is a plurality of cylindrical protrusions formed on the end face of the annular protrusion 111 corresponding to the outer diameter and the center position of each end hole.

[0047] Based on this, in this embodiment, the end face of the annular protrusion 111 provided by the workpiece positioning structure fits the outer end face of the first mounting edge 1 and remains pressed and fitted with the workpiece under the action of the axial pressing force of the second positioning component, thereby avoiding the suspension of the outer end face of the first mounting edge 1, thus avoiding its force deformation, ensuring the clamping position of the reference surface and further ensuring the repair machining accuracy of the remaining surfaces of the workpiece; during the clamping operation, only the annular limiting protrusion 112 needs to be correspondingly embedded into the inner ring surface of the first mounting edge 1 to complete the axial limit and radial limit of the first end of the workpiece, and the operation is convenient.

[0048] Furthermore, the first positioning component further includes a pressing plate 13. It can be understood that the height of the limiting protrusion 112 should be less than or equal to the thickness of the radial surface of the first mounting edge 1. The pressing plate 13 is used to axially press against the inner end surface of the first mounting edge 1 and abut against the end surface of the limiting protrusion 112. Among them, the first positioning plate 11 is threadedly connected with a second bolt 14 passing through the pressing plate 13. The large end of the second bolt 14 axially presses against the end surface of the pressing plate 13, thereby pressing the pressing plate 13 against the inner end surface of the first mounting edge 1. By adjusting the height of the second bolt 14, the axial distance between the pressing plate 13 and the first positioning plate 11 is adjusted to make the pressing plate 13 press against the inner end surface of the first mounting edge 1. The pressing plate 13 simultaneously presses against the end surface of the limiting protrusion 112 and the inner end surface of the first mounting edge 1, increasing the end surface of the limiting protrusion 112 as the contact surface to further improve the parallelism of the pressing plate 13 and enhance the axial positioning effect. Furthermore, the first positioning plate 11 is provided with a first threaded hole 113 for threaded connection with the second bolt 14 at a position inside the annular protrusion 111. The second bolt 14 passes through the middle of the pressing plate 13. The pressing plate 13 is also provided with a second threaded hole 131 with both ends communicating. The second threaded hole 131 is threadedly connected with a stud 15. During clamping, the position of the second threaded hole 131 is roughly adjusted to be symmetric with respect to the position of the limiting protrusion 112 relative to the second bolt 14. The stud 15 is used to adjust the height of one side of the pressing plate 13 to make the end surface of the pressing plate 13 parallel to the inner end surface of the first mounting edge 1, improving the pressing effect. Moreover, both the adjustment position and the clamping position are located inside the workpiece, allowing for simultaneous operation and observation, which is more convenient.

[0049] On the other hand, since the cylinder assembly is a thin-walled long cylinder workpiece, in order to prevent machining chatter, the existing fixture uses a pressing plate 9 to assist in supporting and pressing the annular end surface of the stepped structure of the second mounting edge 4. However, after the workpiece has been used for a long time, the annular end surface of its stepped structure (the C surface shown in Figure 1) usually has been deformed and has poor flatness. When the pressing plate 9 presses against the C surface, it is actually only in partial contact. And different workpieces have different deformations, resulting in different contact positions. After the lathe center applies force to press, only a part of the workpiece is stressed, and the force application is uneven, which cannot play a role in reducing machining chatter of the workpiece. If the pressing force of the center is increased to increase the contact range between the pressing plate 9 and the workpiece surface, it will cause local stress deformation. After the corrugated cylinder is removed from the existing fixture, the stressed part of the corrugated cylinder rebounds, resulting in unqualified dimensions.

[0050] The second positioning component of this embodiment includes a second positioning plate 12. The adjusting member 17 is connected to the second positioning plate 12 with an adjustable axial position. The first end face of the pressing member 16 is arranged to fit the annular end face. The pressing member 16 has a second end face opposite to the first end face. One end of the adjusting member 17 facing the pressing member 16 has an angle adaptation structure. In this embodiment, the angle adaptation structure is an arc-shaped end face 171 formed at the end of the adjusting member 17 facing the pressing member 16. The arc-shaped end face 171 of the adjusting member 17 abuts against the second end face of the pressing member 16. The arc-shaped end face 171 is used to enable the adjusting member 17 to be inclined relative to the second end face of the pressing member 16 when the adjusting member 17 abuts against the pressing member 16, so as to adapt to the deformation of the annular end face. There should be no restrictions in other embodiments. For example, the end of the adjusting member 17 can be set as a spherical rod structure or a hinge structure, etc. It can be understood that the pressing member 16 can be an annular block adapted to the annular end face of the step structure of the second mounting edge 4, or a plurality of pressing blocks evenly arranged on the annular end face of the step structure of the second mounting edge 4.

[0051] Based on this, the second positioning component of this embodiment is provided with an adjusting member 17 with an adjustable axial position. When the axial positions of the first positioning component and the second positioning component are fixed, adjusting the axial position of the adjusting member 17 on the second positioning plate 12 can adapt to the axial dimension of the workpiece, and further adjusting its axial position can adjust the axial pressing force of the pressing member 16 pressing on the second mounting edge 4. When there is deformation on the C surface, the pressing member 16 remains in contact with the C surface. Based on the arc-shaped structure at the end of the adjusting member 17, when the end of the adjusting member 17 abuts against the pressing member 16, the two are at a certain inclination angle, so as to adapt to the deformation of the annular end face, ensure uniform force application to the workpiece, reduce the influence of machining chatter, avoid local stress deformation, and at the same time avoid the rebound after machining caused by excessive axial pressing force of the corrugated cylinder, improving the machining accuracy and qualification rate.

[0052] Further, the pressing member 16 has an inner cavity 161, and a third threaded hole 162 communicating with the inner cavity 161 is provided at the second end of the pressing member 16; the adjusting member 17 is constructed as a threaded rod, and one end of the adjusting member 17 facing the pressing member 16 has a first threaded section 172, and the length of the first threaded section 172 is adapted to the depth of the third threaded hole 162. The adjusting member 17 has a movable shaft section 173 connected to the first threaded section 172. The shaft diameter of the movable shaft section 173 is smaller than the aperture of the third threaded hole 162, and the length of the movable shaft section 173 is greater than the depth of the third threaded hole 162. The movable shaft section 173 and the third threaded hole 162 are used to cooperate to limit the inclination angle of the adjusting member 17 relative to the second end face of the pressing member 16; the adjusting member 17 has a second threaded section 174 for threadedly connecting with the second positioning plate 12, and a second nut 18 is threadedly connected to the second threaded section 174. The second nut 18 is used to be screwed into the second threaded section 174 and abut against the end face of the second positioning plate 12 to limit the rotation of the adjusting member 17; based on this, the radial position of the adjusting member 17 on the second positioning plate 12 is fixed, and the first threaded section 172 is screwed into the inner cavity 161 through the third threaded hole 162. The shaft diameter of the movable shaft section 173 is smaller than the aperture of the third threaded hole 162, so that the first threaded section 172 has a certain movement space in the inner cavity 161 while limiting the radial position range of the pressing member 16, and thus has a radial limiting effect on the annular inner wall surface of the stepped structure of the second mounting edge 4. The first threaded section 172 is screwed into the inner cavity 161 of the pressing member 16, which also prevents the pressing member 16 from falling off without support during clamping operation and disassembly, and avoids situations such as falling, missing, and damage of parts.

[0053] In this embodiment, it is preferably to provide a plurality of arc-shaped pressing members 16. The second positioning plate 12 is axially provided with a fourth threaded hole 121 adapted to the second threaded section 174. The plurality of fourth threaded holes 121 are evenly arranged in the circumferential direction of the second positioning plate 12. The radial position of the fourth threaded hole 121 on the second positioning plate 12 is adapted to the radial dimension of the annular end face of the second mounting edge 4 to control the radial position of the adjusting member 17, thereby controlling the radial position of the pressing member 16 and having a radial positioning effect on the second mounting edge 4.

[0054] On the other hand, this embodiment also provides a clamping method for the cylinder assembly. The cylinder assembly is clamped by the fixture of this embodiment. This clamping method includes:

[0055] Position and assemble the first positioning component on the lathe chuck. The first end of the mandrel 10 axially penetrates through the axial center position of the first positioning component. The axial limiting structures of the lathe chuck and the mandrel 10 axially limit the two end faces of the first positioning component respectively, thereby realizing the axial positioning of the first positioning component.

[0056] Axially position and radially limit the first mounting edge 1 of the cylinder assembly on the workpiece positioning structure of the first positioning assembly. At this time, the second end of the mandrel 10 passes through the cylinder assembly;

[0057] Insert the second end of the mandrel 10 into the axis of the second positioning assembly. Through the axial limiting structure of the mandrel 10, keep a fixed axial distance between the first positioning assembly and the second positioning assembly. The lathe center is abutted against the second end of the mandrel 10.

[0058] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A fixture for clamping a cylinder assembly, wherein the first end to the second end of the cylinder assembly includes a first mounting edge (1), a conical cylinder member (2), a corrugated cylinder member (3), and a second mounting edge (4) that are sequentially connected. It is characterized in that, The fixture includes a mandrel (10), a first positioning component, and a second positioning component; The mandrel (10) is used to connect with a lathe. The first positioning component and the second positioning component are respectively arranged at two ends of the mandrel (10). The first positioning component and the second positioning component are used to clamp the cylinder component at two ends of the cylinder component. The mandrel (10) has an axial limiting structure for limiting the axial distance between the first positioning component and the second positioning component; The first positioning component is used for axially positioning and radially limiting the first mounting edge (1); The second positioning component is used for axially pressing the second mounting edge (4) to axially press the cylinder component onto the first positioning component, and the second positioning component is also used for radially limiting the second mounting edge (4); the second positioning component includes a pressing member (16) for pressing on the second mounting edge (4) and an adjusting member (17) for adjusting the axial pressing force of the pressing member (16) on the second mounting edge (4); the second mounting edge (4) has a stepped structure, the stepped structure includes an annular end face and an annular inner wall surface, the second positioning component includes a second positioning plate (12), the adjusting member (17) is connected to the second positioning plate (12) with an adjustable axial position, a first end face of the pressing member (16) is arranged in contact with the annular end face, the pressing member (16) has a second end face opposite to the first end face, one end of the adjusting member (17) facing the pressing member (16) has an angle adaptation structure, and the angle adaptation structure of the adjusting member (17) abuts against the second end face of the pressing member (16). The angle adaptation structure is used to make the adjusting member (17) tilt relative to the second end face of the pressing member (16) when the adjusting member (17) abuts against the pressing member (16) so that the second positioning component adapts to the deformation of the annular end face.

2. The fixture for clamping the cylinder assembly according to claim 1, wherein, The axial limiting structure includes a first shoulder (101) radially protruding from the outer wall of the mandrel (10) and a second shoulder (102) radially protruding from the outer wall of the mandrel (10); The first shoulder (101) is used to abut against the end face of the first positioning component after the first positioning component is sleeved on the first end of the mandrel (10); The second shoulder (102) is used to abut against the end face of the second positioning component after the second positioning component is sleeved on the second end of the mandrel (10).

3. The fixture for the clamping cylinder assembly according to claim 2, characterized in that, A through hole for passing a screw (103) is formed in the first shoulder (101). The large end of the screw (103) abuts against the end face of the first shoulder (101), and the screw (103) is threadedly connected with the first positioning component to axially position the first positioning component on the first shoulder (101); the second end of the mandrel (10) has an external thread and is threadedly connected with a first nut (105). The first nut (105) is used to press on the second positioning component to axially position the second positioning component on the second shoulder (102).

4. The fixture for clamping the cartridge assembly according to claim 1, wherein, The first positioning component includes a first positioning plate (11) for sleeving on the mandrel (10) and axially positioning on the mandrel (10). The first positioning plate (11) is formed with an annular protrusion (111), and the annular protrusion (111) is used to abut against the outer end face of the first mounting edge (1) so as to axially limit the cylinder assembly; a limiting protrusion (112) is further protruded on the end face of the annular protrusion (111), which is used to cooperate with the inner ring face of the first mounting edge (1) or the end hole of the first mounting edge (1) so as to radially limit the first mounting edge (1).

5. The fixture for the clamping cylinder assembly according to claim 4, wherein The first positioning component further includes a pressing plate (13). The height of the limiting protrusion (112) is less than or equal to the thickness of the first mounting edge (1); the pressing plate (13) is used to axially press against the inner end face of the first mounting edge (1) and abut against the end face of the limiting protrusion (112). The first positioning plate (11) is threadedly connected with a second bolt (14) passing through the pressing plate (13), and the large end of the second bolt (14) axially presses against the end face of the pressing plate (13) so as to press the pressing plate (13) against the inner end face of the first mounting edge (1).

6. The fixture for the clamping cylinder assembly according to claim 5, characterized in that, The first positioning plate (11) is provided with a first threaded hole (113) for threadedly connecting with the second bolt (14) inside the annular protrusion (111). The second bolt (14) passes through the middle of the pressing plate (13). The pressing plate (13) is further provided with a second threaded hole (131) with both ends communicating. A stud (15) is threadedly connected to the second threaded hole (131); the stud (15) is used to adjust the relative position between its end and the pressing plate (13) and abut against the end face of the first positioning plate (11) so as to adjust the height on one side of the pressing plate (13) to make the end face of the pressing plate (13) parallel to the inner end face of the first mounting edge (1).

7. The fixture for clamping the cylinder assembly according to claim 1, characterized in that, The pressing member (16) has an inner cavity (161), and a third threaded hole (162) communicating with the inner cavity (161) is opened at the second end of the pressing member (16); The adjusting member (17) is of a threaded rod structure. One end of the adjusting member (17) facing the pressing member (16) has a first threaded section (172). The length of the first threaded section (172) is adapted to the depth of the third threaded hole (162). The adjusting member (17) has a movable shaft section (173) connected to the first threaded section (172). The shaft diameter of the movable shaft section (173) is smaller than the aperture of the third threaded hole (162). The length of the movable shaft section (173) is greater than the depth of the third threaded hole (162). The movable shaft section (173) and the third threaded hole (162) are used to cooperate to limit the inclination angle of the adjusting member (17) relative to the second end face of the pressing member (16); The adjusting member (17) has a second threaded section (174) for threaded connection with the second positioning plate (12). The second threaded section (174) is threadedly connected with a second nut (18). The second nut (18) is used to be screwed into the second threaded section (174) until it abuts against the end face of the second positioning plate (12), thereby restricting the rotation of the adjusting member (17) to control the axial position of the adjusting member (17) on the second positioning plate (12).

8. The fixture for clamping the cylinder assembly according to claim 7, characterized in that, It includes a plurality of the pressing members (16). The second positioning plate (12) is axially provided with fourth threaded holes (121) adapted to the second threaded section (174). The plurality of fourth threaded holes (121) are evenly arranged circumferentially on the second positioning plate (12). The radial position of the fourth threaded holes (121) on the second positioning plate (12) is adapted to the radial dimension of the annular end face of the second mounting edge (4).

9. A clamping method for a clamping cylinder assembly, characterized in that, Clamping the conical cylinder and the corrugated cylinder by the fixture according to any one of claims 1-8. The clamping method includes: Positioning and assembling the first positioning assembly on the lathe chuck. The first end of the mandrel (10) axially penetrates through the axial center position of the first positioning assembly. The axial limiting structures of the lathe chuck and the mandrel (10) axially limit the two end faces of the first positioning assembly respectively, thereby realizing the axial positioning of the first positioning assembly; Axially positioning and radially limiting the first mounting edge (1) of the cylinder assembly on the workpiece positioning structure of the first positioning assembly. At this time, the second end of the mandrel (10) penetrates out of the cylinder assembly; Inserting the second end of the mandrel (10) through the axial center of the second positioning assembly. By means of the axial limiting structure of the mandrel (10), the first positioning assembly and the second positioning assembly are kept at a fixed axial distance. The lathe center is abutted against the second end of the mandrel (10).

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