A tooling and tooling installation method for double-taper sleeve positive and negative expansion processing of thin-walled cylinder

Abstract

A tooling and tooling installation method for double-taper sleeve positive and negative expansion processing of thin-walled tubes, belonging to the field of mechanical processing. The present invention includes a first taper sleeve, a second taper sleeve, a core shaft and a washer, the core shaft is respectively provided with the first taper sleeve and the second taper sleeve, the washer is installed at both ends of the core shaft through a locking nut, and the thin-walled tube to be processed. The purpose is to solve the problem of making a tightening tooling that can avoid the inner ring ribs of the thin-walled tube to be processed, clamping and processing in one time, ensuring the inner and outer circle size accuracy and inner and outer circle coaxiality of the thin-walled tube to be processed, so as to solve the problem of difficult clamping deformation of such thin-walled tubes during turning, and realize the purpose of processing the outer circle of thin-walled tube parts on a lathe in one time, ensuring the inner and outer circle size accuracy and coaxiality requirements of the thin-walled tube, the tooling taper sleeve is easy to disassemble, the production efficiency is high, and a process route for mass production can be formed to realize mass production, save production costs, and improve efficiency.

Description

Technical Field

[0001] The invention relates to a tool for processing a thin-walled cylinder with double-cone sleeves for positive and negative expansion and a tool installation method, belonging to the field of mechanical processing. Background Art

[0002] Most of the parts on the equipment have certain weight limits and are not allowed to be overweight. Therefore, these parts are generally designed with weight-reducing structures, such as common thin-walled cylindrical parts. However, such structures will bring certain difficulties to the subsequent parts processing.

[0003] For example, a thin-walled tube on a piece of equipment (such as Figure 2 As shown in the figure, this type of thin-walled cylinder has high requirements for the dimensional accuracy, geometric tolerance and surface roughness of the inner and outer circles. The total length of the part is 180mm, and the inner diameter is The tolerance range is 0~0.06, the final wall thickness is 0.9mm, the inner and outer surface roughness is Ra3.2, the coaxiality of the inner and outer circles is 0.05mm, and there is a 1.5mm thick and 3mm wide ring rib in the middle of the inner wall of the cylinder (attached Figure 2 The mark 9 in the figure is used to fix the internal equipment of the cylinder and increase the rigidity of the cylinder wall. In addition to gradual stretching and strong spinning, this type of thin-walled cylinder can generally be processed by turning.

[0004] The above-mentioned two processing methods of gradual stretching and strong spinning have complicated procedures, high costs, and relatively low precision of finished products. They can only form thin-walled cylinders with simple structures. These two methods cannot form the above-mentioned thin-walled cylinders, and can only be formed by turning. In addition, the wall thickness of the above-mentioned thin-walled cylinder is very thin, less than 1mm. Although annular ribs are provided in the middle, the radial rigidity is also very low. During the turning process, it is easily affected by cutting force, cutting heat, clamping force and other factors, and processing deformation occurs.

[0005] The existing turning processing method is to clamp the outer circle of the part under the condition that both the inner and outer circles have allowances to ensure radial rigidity, first process the inner circle of the cylinder to the size, and ensure the dimensional accuracy and roundness of the inner wall of the part. Then, use a common single expansion sleeve and a matching mandrel to expand the inner circle of one side of the ring rib of the part, and process the outer circle of the cylinder on the expansion side to the required size on the lathe. Then, remove the expansion sleeve and the mandrel, install them on the other side of the ring rib to expand the inner circle, and continue to process the outer circle of this side to the required size. This processing scheme is to turn around and clamp the cylinder twice, and process the outer circle of the cylinder twice, and there is a cutter connection in the middle. The coaxiality and outer circle dimensional accuracy of the cylinder are not easy to guarantee, and the production efficiency is low, which is not suitable for mass production.

[0006] Therefore, it is urgent to propose a tooling and a tooling installation method for double-taper sleeve positive and negative expansion processing of thin-walled cylinders to solve the above technical problems. Summary of the invention

[0007] The purpose of the research and development of the present invention is to solve the problem of making a tightening tool that can avoid the inner ring ribs of the thin-walled tube to be processed, clamping and forming in one time, ensuring the inner and outer circle size accuracy and inner and outer circle coaxiality of the thin-walled tube to be processed, so as to solve the problem of easy deformation of such thin-walled tubes during turning. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to determine the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0008] The technical solution of the present invention:

[0009] A tool for processing thin-walled cylinders with double-taper sleeves for positive and negative expansion, comprising a first taper sleeve, a second taper sleeve, a core shaft and a washer. The core shaft is respectively provided with the first taper sleeve and the second taper sleeve. The washer is installed at both ends of the core shaft through locking nuts to process the thin-walled cylinder.

[0010] Preferably, an oil groove is machined on the outer wall of the second cone sleeve.

[0011] Preferably, the mandrel comprises a mandrel body and a threaded rod, and the threaded rods are installed at left and right ends of the mandrel body.

[0012] Preferably, the core shaft body is an olive-shaped double inverted cone.

[0013] Preferably: both ends of the mandrel are processed with center holes. The first cone sleeve and the second cone sleeve are processed with expansion openings. A tool for processing a thin-walled cylinder with double cone sleeves by positive and negative expansion, comprising a first cone sleeve, a second cone sleeve, a mandrel and a disassembly screw sleeve, the mandrel is respectively sleeved with the first cone sleeve and the second cone sleeve, the outer cylindrical surface of the disassembly screw sleeve is processed with threads, the disassembly screw sleeve is installed at the end far from the first cone sleeve and the second cone sleeve, and the inner hole of the disassembly screw sleeve is sleeved on the threaded rod of the mandrel.

[0014] Preferably, an oil groove is machined on the outer wall of the second cone sleeve.

[0015] Preferably, the mandrel comprises a mandrel body and a threaded rod, and the threaded rods are installed at left and right ends of the mandrel body.

[0016] Preferably, the core shaft body is an olive-shaped double inverted cone.

[0017] Preferably, the two ends of the mandrel are processed with center holes. The first cone sleeve and the second cone sleeve are processed with expansion openings.

[0018] In order to solve the problem of tooling installation and disassembly of a double-taper sleeve positive and negative expansion processing thin-walled cylinder, the present invention proposes the following technical solutions:

[0019] A tooling installation method for double-taper sleeve positive and negative expansion processing of thin-walled cylinders:

[0020] Installation steps:

[0021] Step a, before use, use a thick-walled cylindrical blank to first process the outer circle of the thin-walled cylinder to be processed on a lathe and leave a margin to ensure that when processing the inner circle of the thin-walled cylinder to be processed, the three-jaw chuck clamps the outer circle of the thin-walled cylinder to be processed, and the wall of the thin-walled cylinder to be processed does not deform;

[0022] Step b, processing the inner circle of the thin-walled cylinder to be processed and the middle annular rib to the required size;

[0023] Step c, when in use, pre-assemble the first cone sleeve and the olive-shaped inverted cone (one side) in the middle of the mandrel;

[0024] Step d, installing the first cone sleeve and the mandrel pre-installed in step c into the body of the thin-walled cylinder to be processed after step b, controlling the distance between the right end face of the first cone sleeve and the left end face of the inner ring rib of the cylinder to be L1, L1 is 8 to 12 mm, and reserving the axial displacement of the first cone sleeve into the mandrel when the first cone sleeve is expanded and tightened;

[0025] Step e, locking the first cone sleeve with a washer and a locking nut to ensure that the distance between the right end surface of the first cone sleeve and the left end surface of the inner ring rib of the cylinder after expansion is L3, and L3 is 2 to 4 mm;

[0026] Step f, then install the second cone sleeve between the thin-walled cylinder body to be processed and the olive-shaped inverted cone at the other end of the mandrel, and similarly make the distance between the left end face of the second cone sleeve and the right end face of the inner ring rib of the cylinder about L2, L2 is 8-12mm, and reserve the axial displacement of the second cone sleeve into the mandrel when the second cone sleeve is expanded and tightened;

[0027] Step g, locking the second cone sleeve with a washer and a locking nut to ensure that after expansion, the distance between the left end surface of the second cone sleeve and the right end surface of the inner ring rib of the cylinder is about L4, and L4 is 2 to 4 mm;

[0028] Step h, after bidirectional expansion and tightening, the thin-walled tube to be processed is clamped on a lathe, the three jaws of the main shaft clamp one end of the mandrel, and the other end is pressed against the center hole of the mandrel with a top, the mandrel is aligned, and the outer circle of the thin-walled tube to be processed is processed to the required size;

[0029] Disassembly steps:

[0030] Step i, after the processing of the thin-walled tube to be processed is completed, it is removed from the lathe, the locking nuts and washers at both ends are removed, and the disassembly sleeve is inserted into one end of the mandrel from one side of the second taper sleeve. The external thread of the disassembly sleeve is first screwed together with the internal thread of the second taper sleeve on the same side, and the disassembly sleeve is screwed together until the top pressure surface of the front end of the disassembly sleeve contacts the end of the mandrel, and the disassembly sleeve is continued to be turned. At this time, the disassembly sleeve no longer moves forward axially, and the second taper sleeve is driven outward by the external thread of the disassembly sleeve to withdraw a certain displacement. The second taper sleeve shrinks to form a gap with the inner circle of the thin-walled tube to be processed, and the taper sleeve 3 and the disassembly sleeve 5 are withdrawn from the mandrel 4 together. Apply axial force to the mandrel from the other end of the thin-walled tube to be processed to separate the first taper sleeve from the mandrel, and the first taper sleeve shrinks to form a gap with the inner circle of the thin-walled tube to be processed. Continue to apply axial force to withdraw the mandrel and remove the first taper sleeve;

[0031] Step j, inspecting the processed thin-walled tube to ensure that it meets the requirements.

[0032] The present invention has the following beneficial effects:

[0033] 1. The tooling and tooling installation method for processing thin-walled cylinders with double-taper sleeves by positive and negative expansion of the present invention effectively avoids the internal annular ribs of the cylinder body, and solves the problem that such parts need to be expanded and clamped twice;

[0034] 2. The tooling and tooling installation method for processing thin-walled cylinders by double-taper sleeve positive and negative expansion of the present invention achieves the purpose of processing the outer circle of thin-walled cylinder parts by clamping on a lathe once, and ensures the dimensional accuracy and coaxiality requirements of the inner and outer circles of the thin-walled cylinder;

[0035] 3. The tooling and tooling installation method for processing thin-walled cylinders with double-taper sleeves by positive and negative expansion of the present invention are convenient to disassemble, have high production efficiency, and can form a process route for batch production, realize batch production, save production costs, and improve benefits;

[0036] 4. The tooling and tooling installation method for processing thin-walled cylinders by positive and negative expansion of double-taper sleeves of the present invention have simple disassembly methods and easy implementation of thread ejection structures;

[0037] 5. The tooling for processing thin-walled tubes with double-cone sleeves by positive and negative expansion of the present invention has a simple structure, ingenious design, reasonable and practical, convenient disassembly and assembly, firm assembly, low cost, strong replicability and scalability of the structural principle, and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the tooling structure for processing thin-walled cylinders with double-taper sleeves for positive and negative expansion;

[0039] Figure 2 It is a three-dimensional picture of the thin-walled tube to be processed;

[0040] Figure 3 is a structural schematic diagram of a second specific implementation mode;

[0041] Figure 4 It is a schematic diagram of the installation of the first cone sleeve, the second cone sleeve and the mandrel;

[0042] Figure 5 yes Figure 4 Exploded diagram of

[0043] Figure 6 It is a structural schematic diagram of disassembling the screw sleeve;

[0044] Figure 7 It is a stereoscopic diagram of disassembling the screw sleeve;

[0045] Figure 8 yes Figure 1 The enlarged view of point Ⅰ;

[0046] In the figure, 1-the thin-walled cylinder to be processed, 2-the first tapered sleeve, 3-the second tapered sleeve, 4-the core shaft, 5-the disassembly screw sleeve, 6-the washer, 7-the locking nut, 8-the oil groove, 9-the annular rib, 10-the expansion opening, 31-the inner thread of the tapered sleeve, 41-the core shaft body, 42-the threaded rod, 43-the center hole, 51-the inner hole, and 52-the annular oil groove. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0048] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection, including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but is not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: choose welding connection for fixed connection and hinge connection for detachable connection.

[0049] Specific implementation method 1: Combination Figure 1-Figure 7 The present embodiment is described. The present embodiment is a double-taper sleeve positive and negative expansion and tightening tool for processing a thin-walled cylinder, comprising a first taper sleeve 2, a second taper sleeve 3, a core shaft 4 and a gasket 6. Figure 1As shown, the mandrel 4 is respectively provided with the first cone sleeve 2 and the second cone sleeve 3, and the washer 6 is installed at both ends of the mandrel 4 through the locking nut 7. The diameter of the washer 6 is larger than the inner diameter of the outer end of the cone hole of the first cone sleeve 2 and the second cone sleeve 3. The first cone sleeve 2 and the second cone sleeve 3 are processed with an expansion opening 10. The expansion structure of the first cone sleeve 2 and the second cone sleeve 3 avoids the limitation of the middle ring rib 9 of the thin-walled tube 1 to be processed, and the expansion clamping is reliable. The coaxiality of the inner and outer circles of the thin-walled tube is easy to ensure during the turning process, and the thickness of the tube wall is uniform. The tooling of this embodiment is used when the outer circle of the thin-walled tube is turned to the required final size;

[0050] During installation, first put the first taper sleeve 2 on one side of the core shaft 4, and fix it with the gasket 6 and the locking nut 7. The expansion degree between the first taper sleeve 2 and the core shaft 4 is relatively low. The thin-walled tube 1 to be processed is installed on the outside of the first taper sleeve 2, and the locking nut 7 is adjusted so that the inner wall of the thin-walled tube 1 to be processed and the outer wall of the first taper sleeve 2 are expanded and installed, and then the second taper sleeve 3 is installed. The second taper sleeve 3 is fixed with the gasket 6 and the locking nut 7, and the locking nuts 7 on both sides are adjusted so that the outer walls of the first taper sleeve 2 and the second taper sleeve 3 are completely expanded and fit the inner wall of the thin-walled tube 1 to be processed. Finally, the installed workpiece tooling assembly is installed on the lathe for processing.

[0051] Specific implementation method 2: Combination Figure 1-Figure 7 This embodiment is described based on the specific embodiment 1. This embodiment is a double-taper sleeve positive and negative expansion tooling for processing thin-walled cylinders, including a first taper sleeve 2, a second taper sleeve 3, a core shaft 4 and a disassembly screw sleeve 5, such as Figure 3 As shown, the mandrel 4 is respectively provided with a first cone sleeve 2 and a second cone sleeve 3, the outer cylindrical surface of the disassembly screw sleeve 5 is processed with a thread, the first cone sleeve 2 and the second cone sleeve 3 are relatively far from each other and the disassembly screw sleeve 5 is installed at one end, the inner hole 51 of the disassembly screw sleeve 5 is sleeved on the threaded column of the mandrel 4, and an annular oil groove 52 is provided on the top pressure surface of the disassembly screw sleeve 5 that contacts the axial end of the mandrel 4, the first cone sleeve 2 and the second cone sleeve 3 are processed with a tightening opening 10, and the tightening structure of the first cone sleeve 2 and the second cone sleeve 3 avoids the limitation of the middle ring rib 9 of the thin-walled tube 1 to be processed. Since the tooling of this embodiment is a two-way inverted cone sleeve, it is not easy to withdraw the mandrel 4 from one end after the processing of the thin-walled tube 1 to be processed is completed, so that the first cone sleeve 2 and the second tapered sleeve 3 shrink in diameter, and then the first tapered sleeve 2 and the second tapered sleeve 3 are removed. For this reason, the tooling of this embodiment adds a disassembly screw sleeve 5 for disassembling the second tapered sleeve 3, and the external thread of the disassembly screw sleeve 5 is screwed and installed on the second tapered sleeve 3 with an internal thread. When disassembling, the tapered sleeve 3 at one end is pushed out to complete the task of the disassembly tooling. The tooling structure of the double tapered sleeve and the olive-shaped inverted cone-shaped mandrel 4 for positive and negative expansion of the thin-walled tube avoids the interference limitation of the middle ring rib of the thin-walled tube 1 to be processed, and solves the problem that it is not easy to use a single tapered sleeve and the mandrel 4 to expand the body of the thin-walled tube 1 to be processed, and the coaxiality of the outer circle and the inner circle of such thin-walled tube and the dimensional accuracy of the inner and outer circles are guaranteed during the processing.

[0052] Specific implementation method three: Combination Figure 1-Figure 7 The present embodiment is described based on the specific embodiment 1. The present embodiment is a tooling for processing thin-walled tubes by positive and negative expansion of double taper sleeves. An oil groove 8 is processed on the outer wall of the second taper sleeve 3 along the outer circle generatrix direction. The function of the oil groove 8 is to reduce the friction between the second taper sleeve 3 and the inner wall of the thin-walled tube 1 to be processed when the second taper sleeve 3 is disassembled; an annular oil groove 52 is processed on the top pressure surface of the disassembly screw sleeve 5. Its function is to reduce the friction between the top pressure surface of the disassembly screw sleeve 5 and the end face of the core shaft 4, which is beneficial to the removal of the second taper sleeve 3 and the top unloading pressure of the disassembly screw sleeve 5.

[0053] Specific implementation method four: Combination Figure 1-Figure 7 The present embodiment is described as a double-taper sleeve positive and negative expansion tool for processing thin-walled tubes. The core shaft 4 includes a core shaft body 41 and a threaded rod 42. The threaded rod 42 is installed at both ends of the core shaft body 41. The threaded rod 42 facilitates the threaded installation of the locking nut 7, making the relatively fixed structure more stable.

[0054] Specific implementation method five: Combination Figure 1-Figure 7 The present embodiment is described. The present embodiment is a tooling for double-taper sleeve positive and negative expansion processing of thin-walled tubes. The core shaft body 41 is an inverted olive cone. The olive-shaped inverted cone is two frustums arranged in mirror symmetry, thin at both ends and thick in the middle. The first taper sleeve 2 and the second taper sleeve 3 are sleeved on both sides of the core shaft body 41. The distance between the first taper sleeve 2 and the second taper sleeve 3 and the maximum center diameter of the core shaft body 41 is adjusted by removing the threaded sleeve 5 or the locking nut 7 to achieve the opening of the expansion opening 10, increase the diameter of the outer wall of the cone, and then complete the expansion installation of the inner wall of the thin-walled tube 1 to be processed. This arrangement makes the adjustment of the size of the radial cross-section of the first taper sleeve 2 and the second taper sleeve 3 more flexible, the expansion degree is higher, and the collision with the annular rib 9 is avoided.

[0055] Specific implementation method six: Combination Figure 1-Figure 7 The present embodiment is described as a tooling for processing thin-walled tubes by positive and negative expansion of double-taper sleeves. Both ends of the core shaft 4 are processed with center holes 41 to facilitate fixed installation and alignment on a lathe.

[0056] Specific implementation method seven: Combination Figure 1-Figure 7 This embodiment is described. This embodiment is a tooling installation method for double-taper sleeve positive and negative expansion processing of thin-walled cylinders. The installation steps are as follows:

[0057] Step a, before use, use a thick-walled cylindrical blank to first machine the outer circle of the thin-walled tube 1 to be machined on a lathe and leave a margin to ensure that when machining the inner circle of the thin-walled tube 1 to be machined, the three-jaw chuck clamps the outer circle of the thin-walled tube 1 to be machined, and the wall of the thin-walled tube 1 to be machined does not deform;

[0058] Step b, processing the inner circle and the middle ring rib of the thin-walled tube 1 to be processed to the required size;

[0059] Step c, when in use, first pre-assemble the first cone sleeve 2 and the olive-shaped inverted cone in the middle of the core shaft 4 together;

[0060] Step d, installing the first cone sleeve 2 and the mandrel 4 pre-installed in step c into the cylinder body of the thin-walled cylinder 1 to be processed after step b, controlling the distance between the right end face of the first cone sleeve 2 and the left end face of the annular rib 9 to be L1, L1 is 8 to 12 mm, and reserving the axial displacement of the first cone sleeve 2 into the mandrel 4 when the first cone sleeve 2 is expanded and tightened;

[0061] Step e, locking the first cone sleeve 2 with a washer 6 and a locking nut 7, ensuring that the distance between the right end surface of the first cone sleeve 2 and the left end surface of the annular rib 9 after expansion is L3, and L3 is 2 to 4 mm;

[0062] Step f, then install the second cone sleeve 3 into the other end of the thin-walled tube 1 to be processed and the core shaft 4, and similarly make the distance between the left end face of the second cone sleeve 3 and the right end face of the annular rib 9 be about L2, L2 is 8-12mm, and reserve the axial displacement of the second cone sleeve 3 into the core shaft 4 when the second cone sleeve 3 is expanded and tightened;

[0063] Step g, tighten the second cone sleeve 3 with the washer 6 and the locking nut 7 to ensure that the distance between the left end face of the second cone sleeve 3 and the right end face of the annular rib 9 after expansion is about L4, and L4 is 2 to 4 mm;

[0064] Step h, after bidirectional expansion and tightening, the thin-walled tube 1 to be processed is clamped on the lathe, the three jaws of the main shaft clamp one end of the mandrel 4, and the other end is pressed on the center hole 41 of the mandrel 4 with a top, the mandrel 4 is aligned, and the outer circle of the thin-walled tube 1 to be processed is processed to the required size;

[0065] Disassembly steps:

[0066] Step i, after the processing of the thin-walled tube 1 is completed, it is removed from the lathe, the locking nuts 7 and washers 6 at both ends are removed, and the disassembly sleeve 5 is inserted into one end of the core shaft 4. The external thread of the disassembly sleeve 5 is first screwed together with the internal thread of the second taper sleeve 3 on the same side, and the disassembly sleeve 5 is screwed together until the top pressure surface of the front end of the disassembly sleeve 5 contacts the axial end of the core shaft 4, and the disassembly sleeve 5 is continued to be turned. At this time, the disassembly sleeve 5 no longer moves forward axially, and the second taper sleeve 3 is driven outward by the external thread of the disassembly sleeve 5 to withdraw a certain displacement. The second taper sleeve 3 shrinks to form a gap with the inner circle of the thin-walled tube 1 to be processed, and the taper sleeve 3 and the sleeve 5 are withdrawn from the core shaft 4 together. Apply axial force to the core shaft 4 from the other end of the thin-walled tube 1 to be processed to separate the first taper sleeve 2 from the core shaft 4, and the first taper sleeve 2 shrinks to form a gap with the inner circle of the thin-walled tube 1 to be processed. Continue to apply axial force to withdraw from the core shaft 4 and remove the first taper sleeve 2;

[0067] Step j, inspecting the processed thin-walled tube 1 to ensure that it meets the requirements.

[0068] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0069] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0070] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0071] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0072] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0073] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tooling installation method for double-taper sleeve positive and negative expansion processing of thin-walled cylinders, characterized in that: Installation steps: Step a, before use, using a thick-walled cylindrical blank to machine the outer circle of the thin-walled cylinder (1) on a lathe and leaving a margin, to ensure that when machining the inner circle of the thin-walled cylinder (1), the three-jaw chuck clamps the outer circle of the thin-walled cylinder (1) to be machined, and the wall of the thin-walled cylinder (1) to be machined does not deform; Step b, processing the inner circle of the thin-walled cylinder (1) to be processed and the middle annular rib (9) to the required size; Step c, when in use, first pre-assemble the first cone sleeve (2) and the olive-shaped inverted cone in the middle of the core shaft (4); Step d, installing the first cone sleeve (2) and the core shaft (4) pre-installed in step c into the cylinder body of the thin-walled cylinder (1) to be processed after processing in step b, controlling the distance between the right end surface of the first cone sleeve (2) and the left end surface of the annular rib (9) to be L1, L1 being 8 to 12 mm, and reserving an axial displacement amount of the first cone sleeve (2) into the core shaft (4) when the first cone sleeve (2) is expanded and tightened; Step e, locking the first cone sleeve (2) with a washer (6) and a locking nut (7) to ensure that after expansion, the distance between the right end surface of the first cone sleeve (2) and the left end surface of the annular rib (9) is L3, and L3 is 2 to 4 mm; Step f, after that, a second cone sleeve (3) is installed on the other end of the thin-walled cylinder (1) to be processed and the core shaft (4), and the distance between the left end face of the second cone sleeve (3) and the right end face of the annular rib (9) is L2, and L2 is 8-12 mm, and a reserve is made for the axial displacement of the second cone sleeve (3) into the core shaft (4) when the second cone sleeve (3) is expanded and tightened; Step g, locking the second cone sleeve (3) with a washer (6) and a locking nut (7) to ensure that after expansion, the distance between the left end face of the second cone sleeve (3) and the right end face of the annular rib (9) is L4, and L4 is 2 to 4 mm; Step h, the thin-walled tube (1) to be processed is clamped on a lathe after bidirectional expansion, the three-jaw spindle clamps one end of the mandrel (4), and the other end is pressed against the center hole (41) of the mandrel (4) with a top, the mandrel (4) is aligned, and the outer diameter of the thin-walled tube (1) to be processed is processed to the required size; Disassembly steps: Step i, after the thin-walled tube (1) is processed, it is removed from the lathe, the locking nuts (7) and washers (6) at both ends are removed, and the disassembly screw sleeve (5) is inserted into one end of the mandrel (4). The external thread of the disassembly screw sleeve (5) is first screwed into the internal thread (31) of the second tapered sleeve (3) on the same side, and the disassembly screw sleeve (5) is screwed until the top pressure surface of the front end of the disassembly screw sleeve (5) contacts the axial end of the mandrel (4), and the disassembly screw sleeve (5) is continued to be turned. At this time, the disassembly screw sleeve (5) no longer moves forward in the axial direction, and the second tapered sleeve (3) The outer thread of the dismantling screw sleeve (5) is driven outward to withdraw a certain displacement, the second cone sleeve (3) shrinks to form a gap with the inner circle of the thin-walled tube (1) to be processed, the cone sleeve (3) and the screw sleeve (5) are withdrawn from the core shaft (4), and an axial force is applied to the core shaft (4) from the other end of the thin-walled tube (1) to be processed, so that the first cone sleeve (2) is separated from the core shaft (4), the first cone sleeve (2) shrinks to form a gap with the inner circle of the thin-walled tube (1) to be processed, and the axial force is continued to be applied to withdraw the core shaft (4), and the first cone sleeve (2) is removed; Step j, inspecting the processed thin-walled tube (1) to ensure that it meets the requirements.

2. A tool for double-taper sleeve positive and negative expansion processing of thin-walled cylinders, which is applied to the installation method of double-taper sleeve positive and negative expansion processing of thin-walled cylinders as claimed in claim 1, characterized in that: The invention comprises a first cone sleeve (2), a second cone sleeve (3), a core shaft (4) and a washer (6); the first cone sleeve (2) and the second cone sleeve (3) are respectively mounted on the core shaft (4); and the washer (6) is mounted on both ends of the core shaft (4) via locking nuts (7).

3. A tool for double-taper sleeve positive and negative expansion processing of thin-walled cylinders, which is applied to the installation method of double-taper sleeve positive and negative expansion processing of thin-walled cylinders as claimed in claim 1, characterized in that: The invention comprises a first cone sleeve (2), a second cone sleeve (3), a core shaft (4) and a disassembly screw sleeve (5); the first cone sleeve (2) and the second cone sleeve (3) are respectively mounted on the core shaft (4); the outer wall of the disassembly screw sleeve (5) is processed with threads; the disassembly screw sleeve (5) is mounted on the end of the first cone sleeve (2) and the second cone sleeve (3) which are relatively far away; and the inner hole (51) of the disassembly screw sleeve (5) is mounted on the core shaft (4).

4. A tool for processing thin-walled cylinders by positive and negative expansion of double-taper sleeves according to claim 2 or 3, characterized in that: An oil groove (8) is machined on the outer wall of the second cone sleeve (3).

5. According to claim 4, a tool for processing thin-walled cylinders by positive and negative expansion of double-taper sleeves is characterized by: The core shaft (4) comprises a core shaft body (41) and a threaded rod (42), and the threaded rod (42) is installed at the left and right ends of the core shaft body (41).

6. The tooling for double-taper sleeve positive and negative expansion processing of thin-walled cylinders according to claim 5 is characterized in that: The core shaft body (41) is an olive-shaped inverted cone.

7. The tooling for double-taper sleeve positive and negative expansion processing of thin-walled cylinders according to claim 6 is characterized in that: Both ends of the core shaft (4) are machined with central holes (43).

8. A tool for processing thin-walled cylinders by positive and negative expansion of double-taper sleeves according to claim 2 or 3, characterized in that: The first cone sleeve (2) and the second cone sleeve (3) are machined with expansion openings (10).

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