Variable-diameter inner supporting device for lathe tailstock

Abstract

The utility model discloses a lathe tailstock variable-diameter inner supporting device which comprises a tailstock inner supporting plug and a supporting screw rod, and the rear end flange spigot end of the tailstock inner supporting plug is fixedly connected with the end face of a lathe tailstock through a connecting bolt. Four threaded through holes are evenly distributed in the outer circle of the supporting section at the front end of the supporting plug in the tailstock, the supporting screws are installed in the threaded through holes, and the extending amount of the supporting screws is adjusted to jack and support a workpiece. The diameter-increasing ring units are installed, the supporting range of the hole diameter of a workpiece can be expanded by additionally installing one stage of diameter-increasing ring unit every time, multiple stages of diameter-increasing ring units can be sequentially added, the maximum rotation diameter of lathe equipment is achieved, and full coverage of supporting and machining of inner holes of cylinder and sleeve type products within the rotation diameter range of a lathe is achieved; the diameter-increasing ring unit belongs to a supporting plug embedded into the tailstock, so that the variable-diameter inner supporting device for the lathe tailstock is compact in overall structure, convenient to assemble and disassemble, small in part number, simple in manufacturing process and convenient to use and assemble and disassemble.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a variable diameter inner supporting device for a lathe tailstock. Background Art

[0002] With the mass production of pipelines at the Minhe Nuclear Power Plant and the diversification of products, product characteristics include large variations in pipe diameters. The processing of various types of super pipes, heads, penetrations, thin-walled stainless steel cylinders, tees, reducing crosses, and reducing five-way pipes all require beveling of the end areas. A single plug or tailstock internal support fixture on a lathe is difficult to meet the processing requirements for the varying diameters of barrel and sleeve pipe fittings. The existing tailstock internal support fixture has an extremely limited range of screw engagement and scaling of the four ejector support screws, resulting in a narrow range of supported workpiece apertures, making it difficult to meet the tailstock support needs of various products with vastly varying diameters. Summary of the Invention

[0003] The purpose of the utility model is to solve the above technical problems and provide a lathe tailstock variable diameter inner support device which can adapt to huge differences in workpiece pipe diameters.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a variable-diameter internal support device for the tailstock of a lathe, comprising a tailstock internal support plug and a support screw. The rear end flange stop end of the tailstock internal support plug is connected and fixed to the end face of the lathe tailstock by a connecting bolt; four threaded through holes are evenly distributed on the outer circle of the front end support section of the tailstock internal support plug, and the support screw is installed in the threaded through holes. The extension amount of the support screw is adjusted to support the workpiece.

[0005] Furthermore, it also includes an increasing ring assembly, which includes a multi-stage increasing ring unit, and each stage increasing ring unit has four threaded through holes and four bolt holes evenly arranged in the circumferential direction on the outer circular surface, and the threaded through holes and the bolt holes are alternately and evenly arranged; from the inside to the outside, the first-stage increasing ring unit is nested in the inner hole of the second-stage increasing ring unit, and the connecting bolt passes through the bolt hole of the second-stage increasing ring unit until it is screwed into the threaded through hole of the first-stage increasing ring unit, thereby fixing the first-stage increasing ring unit with the second-stage increasing ring unit; the second-stage increasing ring unit is nested in the inner hole of the third-stage increasing ring unit, and the connecting bolt passes through the bolt hole of the third-stage increasing ring unit until it is screwed into the threaded through hole of the second-stage increasing ring unit, thereby fixing the second-stage increasing ring unit with the third-stage increasing ring unit; and so on.

[0006] Furthermore, the support section of the tailstock internal support plug is nested in the center hole of the first-level diameter increasing ring unit, the connecting bolt passes through the bolt hole of the first-level diameter increasing ring unit until it is screwed into the threaded through hole of the tailstock internal support plug to securely connect the two, and the support screw is installed into the threaded through hole on the outer circle of the first-level diameter increasing ring unit.

[0007] Furthermore, the primary increasing diameter ring unit is nested in the inner hole of the secondary increasing diameter ring unit, and the connecting bolt passes through the bolt hole of the secondary increasing diameter ring unit until it is screwed into the threaded through hole of the primary increasing diameter ring unit, thereby fixing the primary increasing diameter ring unit and the secondary increasing diameter ring unit; the supporting screw is installed in the threaded through hole on the outer circle of the secondary increasing diameter ring unit.

[0008] Furthermore, the bolt hole is a through hole with a countersunk platform.

[0009] Furthermore, each stage of the diameter-increasing ring unit has a weight-reducing hole.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the variable diameter internal support device of the tailstock of the lathe of the present invention adds an increasing ring unit to the tailstock inner support, and each additional increasing ring unit can expand the workpiece aperture support range, and multiple increasing ring units can be added in sequence to reach the maximum rotation diameter of the lathe equipment, thereby achieving full coverage of the inner hole support processing of cylinders and sleeves within the rotation diameter range of the lathe; the increasing ring unit is nested and installed in the tailstock inner support plug, so that the overall structure of the variable diameter internal support device of the tailstock of the lathe is compact, easy to assemble and disassemble, with a small number of parts, a simple manufacturing process, easy to use, and easy to assemble and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the installation of the variable diameter inner support device of the lathe tailstock of the utility model;

[0012] Figure 2 This is a schematic diagram of the assembly of the first-stage diameter increasing ring unit of the utility model;

[0013] Figure 3 This is a schematic diagram of the assembly of the secondary diameter increasing ring unit of the utility model;

[0014] Figure 4 for Figure 3 Schematic side view of the mid-diameter ring unit. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0016] like Figure 1The illustrated lathe tailstock variable-diameter internal support device comprises a tailstock internal support plug 1, a support screw 2, and an increasing ring assembly. The rear flange end of the tailstock internal support plug 1 is connected to the end face of the lathe tailstock 6 via connecting bolts 5. Four threaded through-holes are evenly distributed along the outer circumference of the front support section of the tailstock internal support plug 1. The support screws 2 are inserted into these threaded through-holes. Adjusting the extension of the support screws 2 allows for support of cylindrical and sleeve-like workpieces. The supported workpiece aperture ranges from ∮D + 40 mm (the thickness of the support screw head) to ∮D + 250 mm (the support screw adjustment length), providing a primary adjustment for the product's support aperture range. D represents the outer diameter of the front support section of the tailstock internal support plug 1.

[0017] Combine Figure 4 The illustrated diameter increasing ring assembly includes a multi-stage diameter increasing ring unit. Four threaded through holes and four bolt holes are evenly arranged along the circumferential direction on the outer circumferential surface of each stage of the diameter increasing ring unit, and the threaded through holes and the bolt holes are alternately and evenly arranged, and the bolt holes are through holes with countersunk platforms 8. From the inside to the outside, the primary diameter increasing ring unit 3 is nested in the inner hole of the secondary diameter increasing ring unit 4, and the connecting bolt 5 passes through the bolt hole of the secondary diameter increasing ring unit 4 until it is screwed into the threaded through hole of the primary diameter increasing ring unit 3, thereby fixing the primary diameter increasing ring unit 3 with the secondary diameter increasing ring unit 4; the secondary diameter increasing ring unit is nested in the inner hole of the tertiary diameter increasing ring unit, and the connecting bolt passes through the bolt hole of the tertiary diameter increasing ring unit until it is screwed into the threaded through hole of the secondary diameter increasing ring unit, thereby fixing the secondary diameter increasing ring unit with the tertiary diameter increasing ring unit; and so on. The diameter increasing ring unit is installed according to actual needs, and the installation method is the same as above and will not be repeated.

[0018] like Figure 2 As shown, when the workpiece aperture is larger than the supporting aperture of the primary adjustment range of the support plug 1 in the tailstock, the supporting section of the support plug 1 in the tailstock is nested in the center hole of the first-level diameter increasing ring unit 3, and the connecting bolt 5 passes through the bolt hole of the first-level diameter increasing ring unit until it is screwed into the threaded through hole of the support plug 1 in the tailstock to securely connect the two. The supporting screw 2 is installed in the threaded through hole on the outer circle of the first-level diameter increasing ring unit 3 to achieve the first-level adjustment of supporting products with larger apertures. The supported workpiece aperture range is ∮D+290 (including the increased aperture 250 + the support screw pile head thickness 40) mm to ∮D+500 (including the increased aperture 250 + the support screw adjustment length 250) mm.

[0019] like Figure 3As shown, when the workpiece aperture is larger than the first-level adjustment support aperture range, the first-level increasing ring unit is nested in the inner hole of the second-level increasing ring unit, and the connecting bolt passes through the bolt hole of the second-level increasing ring unit until it is screwed into the threaded through hole of the first-level increasing ring unit, thereby fixing the first-level increasing ring unit to the second-level increasing ring unit; the supporting screw is installed in the threaded through hole on the outer circle of the second-level increasing ring unit 4 to achieve the second-level adjustment of supporting workpieces with larger apertures. The supported workpiece aperture range is ∮D+540 (including twice the diameter increase of 500 + the thickness of the support screw pile head of 40) mm to ∮D+750 (including twice the diameter increase of 500 + the support screw adjustment length of 250) mm.

[0020] According to specific needs, a three-stage diameter increasing ring unit or even a four-stage diameter increasing ring unit can also be installed, and the installation process will not be described in detail.

[0021] The lathe tailstock variable diameter inner support device can adjust the roundness and circular runout of the workpiece mouth by fine-tuning the support screw 2 while supporting the inner hole of the workpiece tail end. The workpiece mouth can be processed if it meets the process processing conditions after measurement and inspection.

[0022] By inserting the support screw 2 into the threaded through-hole of the diameter-increasing ring assembly, the tooling is used for rounding, straightening, and skeletal support of thin-walled parts. The lathe tailstock's variable-diameter internal support device is used in sets and installed in various deformed sections of the workpiece's inner bore. The support screw 2 is manually adjusted to support the inner bore, correcting deformation of the workpiece within thin-walled cylinders and sleeves, adjusting the workpiece's roundness and straightness, and improving the overall machining rigidity of the workpiece to meet the processing requirements. Once the tooling and workpiece form an integrated unit, the entire outer diameter of the workpiece can be machined.

[0023] The length of the middle rod between the front end top support section and the rear end flange of the tailstock internal support plug 1 is 200 mm, so that the tailstock variable diameter internal support device can support the inner hole of the workpiece while having a sufficiently ample lathe processing space for the tail of the workpiece, which is conducive to the advance and retraction of the tool and the measurement of dimensions during processing.

[0024] Each level of the increasing ring unit adopts a lightweight design, with 7 weight-reducing holes milled out. The weight of the increasing ring is reduced to less than 15kg without affecting the structural rigidity, so that the assembly and disassembly of the tooling can be completed manually. Compared with the traditional bulky overall tooling, it saves the waiting time for crane lifting and reduces the machine occupancy time.

[0025] The variable diameter internal support device of the lathe tailstock adds an increasing ring unit to the tailstock inner support. Each additional increasing ring unit can expand the workpiece aperture support range by 250 mm, and multiple increasing ring units can be added in sequence to reach the maximum rotation diameter of the lathe equipment, realizing full coverage of the inner hole support processing of cylinders and sleeves within the rotation diameter range of the lathe.

[0026] The increasing ring unit is a nested, internal support plug for the tailstock, making the lathe tailstock's variable diameter internal support device compact, easy to assemble and disassemble, with a small number of parts and a simple manufacturing process. The evenly spaced threaded holes in the increasing ring unit are used as a set of four support screws, creating a tool for rounding and straightening thin-walled parts and supporting the internal skeleton. The increasing ring unit is installed in various deformation sections of the workpiece's inner bore to correct deformation of the workpiece within thin-walled cylinders and sleeves, adjust the workpiece's roundness and straightness, and improve the overall rigidity of the workpiece during external cylindrical machining, meeting the processing conditions required by the process.

Claims

1. A lathe tailstock variable diameter inner support device, characterized by: The invention comprises a tailstock inner support plug (1) and a support screw (2); the rear end flange stop end of the tailstock inner support plug (1) is connected and fixed to the end face of the lathe tailstock (6) through a connecting bolt (5); four threaded through holes are evenly distributed on the outer circle of the front end support section of the tailstock inner support plug (1); the support screw (2) is installed in the threaded through holes, and the extension amount of the support screw (2) is adjusted to support the workpiece.

2. The variable diameter inner support device for the lathe tailstock according to claim 1, characterized in that: The invention also includes an increasing diameter ring assembly, which includes a multi-stage increasing diameter ring unit. Four threaded through holes and four bolt holes are evenly arranged along the circumferential direction on the outer circumferential surface of each stage increasing diameter ring unit, and the threaded through holes and the bolt holes are alternately and evenly arranged; from the inside to the outside, the first-stage increasing diameter ring unit (3) is nested in the inner hole of the second-stage increasing diameter ring unit (4), and the connecting bolt (5) passes through the bolt hole of the second-stage increasing diameter ring unit (4) until it is screwed into the threaded through hole of the first-stage increasing diameter ring unit (3), thereby fixing the first-stage increasing diameter ring unit (3) and the second-stage increasing diameter ring unit (4); the second-stage increasing diameter ring unit is nested in the inner hole of the third-stage increasing diameter ring unit, and the connecting bolt passes through the bolt hole of the third-stage increasing diameter ring unit until it is screwed into the threaded through hole of the second-stage increasing diameter ring unit, thereby fixing the second-stage increasing diameter ring unit and the third-stage increasing diameter ring unit; and so on.

3. The variable diameter inner support device for the lathe tailstock according to claim 2, characterized in that: The support section of the tailstock inner support plug (1) is inserted into the center hole of the first-stage diameter increasing ring unit (3), and the connecting bolt (5) is passed through the bolt hole of the first-stage diameter increasing ring unit until it is screwed into the threaded through hole of the tailstock inner support plug (1) to securely connect the two, and the support screw (2) is installed into the threaded through hole on the outer circle of the first-stage diameter increasing ring unit (3).

4. The variable diameter inner support device for the lathe tailstock according to claim 2, characterized in that: The primary diameter increasing ring unit (3) is nested in the inner hole of the secondary diameter increasing ring unit (4), and the connecting bolt (5) is passed through the bolt hole of the secondary diameter increasing ring unit (4) until it is screwed into the threaded through hole of the primary diameter increasing ring unit (3), thereby fixedly connecting the primary diameter increasing ring unit (3) and the secondary diameter increasing ring unit (4); and the supporting screw (2) is installed in the threaded through hole on the outer circle of the secondary diameter increasing ring unit (4).

5. The variable diameter inner support device for the lathe tailstock according to claim 2, characterized in that: The bolt hole is a through hole with a sinking platform (8).

6. The variable diameter inner support device for the lathe tailstock according to claim 2, characterized in that: Each stage of the diameter-increasing ring unit is provided with a weight-reducing hole (7).

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