CN114211282A - Lathe fixture suitable for overlong thin-wall special-shaped titanium alloy pipe fitting - Google Patents

Lathe fixture suitable for overlong thin-wall special-shaped titanium alloy pipe fitting Download PDF

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Publication number
CN114211282A
CN114211282A CN202111243923.6A CN202111243923A CN114211282A CN 114211282 A CN114211282 A CN 114211282A CN 202111243923 A CN202111243923 A CN 202111243923A CN 114211282 A CN114211282 A CN 114211282A
Authority
CN
China
Prior art keywords
lathe
titanium alloy
lathe fixture
clamping
ultra
Prior art date
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Pending
Application number
CN202111243923.6A
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Chinese (zh)
Inventor
张宏丽
李鹏德
唐授忠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shaanxi Zhenming New Material Technology Co ltd
Original Assignee
Shaanxi Taibofeite Aviation Manufacturing Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shaanxi Taibofeite Aviation Manufacturing Co ltd filed Critical Shaanxi Taibofeite Aviation Manufacturing Co ltd
Priority to CN202111243923.6A priority Critical patent/CN114211282A/en
Publication of CN114211282A publication Critical patent/CN114211282A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/12Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for securing to a spindle in general
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B31/00Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02Chucks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B31/00Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02Chucks
    • B23B31/10Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/20Longitudinally-split sleeves, e.g. collet chucks

Abstract

The invention provides a lathe fixture suitable for an ultra-long thin-wall special-shaped titanium alloy pipe fitting, which comprises at least two clamping blocks and a spring piece connected between the clamping blocks, wherein the clamping blocks and the spring piece are connected with each other to form an annular lathe fixture, the inner surface of the lathe fixture is used for being matched with the ultra-long special-shaped titanium alloy thin-wall pipe fitting to be clamped, the outer surface of the lathe fixture is used for being matched with a movable clamping jaw of a lathe, and the spring piece can stretch and contract along the circumferential direction of the lathe fixture to adjust the radial position of the clamping blocks. The invention can avoid the deformation of the thin-wall pipe workpiece under the action of assembly stress and avoid the problems of indentation and flattening deformation of the outer circle surface of the workpiece caused by the radial clamping force of the movable clamping jaws. In addition, the lathe fixture disclosed by the invention has certain applicability to the ultra-long special-shaped titanium alloy thin-wall pipe fitting within a certain size range, so that the production cost of the ultra-long special-shaped titanium alloy thin-wall pipe fitting can be reduced, and the production efficiency is improved.

Description

Lathe fixture suitable for overlong thin-wall special-shaped titanium alloy pipe fitting
Technical Field
The invention relates to the field of lathe machining auxiliary parts, in particular to a lathe fixture suitable for an overlong thin-wall special-shaped titanium alloy pipe fitting.
Background
The numerical control machine tool is an electromechanical integrated product integrating multiple technologies such as machinery, electricity, hydraulic pressure, pneumatics, microelectronics and information, and is a machine tool with the advantages of high precision, high efficiency, high automation, high flexibility and the like in mechanical manufacturing equipment. Numerically controlled lathes are one of the main varieties of numerically controlled machine tools, which occupy a very important position in numerically controlled machine tools.
The numerical control lathe in the prior art, when turning heavier longer axis body work piece "one presss from both sides one", the clamping scheme most often used, the one end of axis body work piece is held by the activity jack catch promptly, and the other end is tight with the top in the back top, can make the work piece more firm in the car round pin course of working like this to can process with great cutting quantity, improve machining efficiency.
However, when a clamping scheme of 'one clamping and one jacking' is adopted for a longer thin-wall pipe workpiece, the freedom degree of the clamping end of the thin-wall pipe workpiece is zero, and after the jacking end is forcibly jacked by the rear center, assembly stress is easily generated in the workpiece in the machining process. If the workpiece is turned under the condition that the assembly stress exists, after the workpiece is turned and unloaded from the lathe, the workpiece is easy to deform when the assembly stress is released, and particularly when the workpiece is bent to a certain degree, the workpiece deformation caused by the release of the assembly stress is more serious, so that the turning quality and the turning precision of the workpiece are seriously influenced.
In addition, when a scheme of clamping one end of a long or overlong special-shaped titanium alloy thin-wall pipe workpiece is adopted for clamping, the movable clamping jaw at the clamping end is in direct contact with the outer surface of the workpiece, and the outer surface of the workpiece is easy to generate indentation under the action of the radial clamping force of the movable clamping jaw. Meanwhile, the thin-walled tube is easy to flatten and deform due to the larger radial clamping force, and the processing quality of the workpiece is more seriously affected due to unbalanced stress distribution of the special-shaped workpiece with the changed inner diameter or outer diameter.
In addition, because the types of the thin-walled tube workpieces are numerous, when the lathe machining of the ultra-long special-shaped titanium alloy thin-walled tube workpiece is required, and the blanks in different batches under the same specification have size differences, if corresponding tool fixtures are customized for the thin-walled tube workpieces in different types and different batches, the production cost of the thin-walled tube is increased, and the corresponding work fixtures need to be searched for each clamping, which wastes time and labor.
Therefore, a special tool clamp for a lathe is urgently needed for clamping an overlong variable-diameter special-shaped titanium alloy thin-wall pipe workpiece, so that the problems of workpiece deformation caused by assembly stress and indentation and flattening deformation of the outer circle surface of the workpiece caused by the radial clamping force of a movable clamping jaw are solved.
Disclosure of Invention
In view of the above, the invention provides a lathe fixture suitable for an ultra-long thin-wall special-shaped titanium alloy pipe fitting, which can avoid the deformation of an ultra-long special-shaped titanium alloy thin-wall pipe workpiece under the action of an assembling stress and avoid the problems of indentation and flattening deformation of the outer circle surface of the workpiece caused by the radial clamping force of a movable clamping jaw. In addition, the lathe fixture disclosed by the invention has certain applicability to the ultra-long special-shaped titanium alloy thin-wall pipe fitting within a certain size range, so that the production cost of the ultra-long special-shaped titanium alloy thin-wall pipe fitting can be reduced, and the production efficiency is improved.
In one aspect of the invention, the lathe fixture suitable for the ultra-long thin-wall special-shaped titanium alloy pipe comprises at least two clamping blocks and a spring piece connected between the clamping blocks, the clamping blocks and the spring piece are connected with each other to form an annular lathe fixture, the inner surface of the lathe fixture is used for matching with the ultra-long special-shaped titanium alloy thin-wall pipe to be clamped, the outer surface of the lathe fixture is used for matching with a movable jaw of a lathe, and the spring piece can stretch and contract along the circumferential direction of the lathe fixture to adjust the radial position of the clamping blocks.
Preferably, the outer wall surface of the ultra-long special-shaped titanium alloy thin-wall pipe fitting to be clamped is a cylindrical surface, the inner surface of the clamping block is at least one part of the cylindrical surface, the diameter of the inner surface of the clamping block is not smaller than the outer diameter of the ultra-long special-shaped titanium alloy thin-wall pipe fitting to be clamped, and the length of the inner surface of the clamping block in the axial direction is not larger than the length of a movable clamping jaw of a lathe in the axial direction.
Preferably, the assembly surface of the movable jaw of the lathe is at least one part of a cylindrical surface, the outer surface of the clamping block is at least one part of a spherical surface, the diameter of the outer surface of the clamping block is not larger than the inner diameter of the movable jaw of the lathe, and the spherical center of the outer surface of the clamping block is coincided with the central symmetry point of the lathe clamp.
Preferably, the central axes of the inner and outer surfaces of the clamping block are arranged parallel to each other.
Preferably, the clamping block and the spring plate in the lathe fixture are formed by cutting the same annular structural member, wherein the spring plate is formed by oppositely cutting and connecting the edges of the cut regions between the regions corresponding to the clamping block.
Preferably, the spring plate is made by cutting the annular structures axially towards each other and connecting the edges of the cut areas.
Preferably, the spring plate is made of the ring-shaped structure by wire electrical discharge machining technology.
Preferably, the spring plate comprises at least three layers of plate structures distributed in a zigzag manner.
Preferably, the movable clamping jaws of the lathe are of a three-jaw structure, the number of the clamping blocks is three, the three clamping blocks are distributed at the trisection position of the lathe fixture, and the spring pieces are distributed at the trisection position of the lathe fixture at equal intervals.
Preferably, the number of the clamping blocks is four, four clamping blocks are distributed at the quartering position of the lathe fixture, the number of the spring pieces is four, and four spring pieces are distributed on a pair of orthogonal axes of the lathe fixture.
Therefore, the lathe fixture suitable for the ultra-long thin-wall special-shaped titanium alloy pipe fitting is connected between the ultra-long special-shaped titanium alloy thin-wall pipe fitting to be clamped and the movable clamping jaws of the lathe, so that the condition that the thin-wall pipe workpiece deforms under the action of assembly stress can be avoided, and the problems that indentation and flattening deformation are generated on the outer circle surface of the workpiece due to the radial clamping force of the movable clamping jaws are solved.
The outer surface of the clamping block of the lathe fixture is a spherical surface, and the spherical surface can generate certain displacement when being matched with a movable jaw of a lathe, so that the machining stress generated in the machining of the ultra-long special-shaped titanium alloy thin-wall pipe fitting can be released by utilizing the displacement, and the deformation of a workpiece is avoided.
In addition, the telescopic spring piece is connected between the clamping blocks, so that the lathe fixture has certain size elasticity under the action of the spring piece, and therefore, the lathe fixture has certain applicability to the ultra-long special-shaped titanium alloy thin-wall pipe fitting within a certain size range, the production cost of the ultra-long special-shaped titanium alloy thin-wall pipe fitting can be reduced, and the production efficiency is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter, and not limit the subject matter.
FIG. 1 is a schematic structural diagram of a lathe fixture suitable for an ultra-long thin-wall special-shaped titanium alloy pipe fitting in an installation state;
FIG. 2 is an enlarged schematic view of region A in FIG. 1;
fig. 3 is a schematic structural diagram of the lathe fixture suitable for the ultralong thin-wall special-shaped titanium alloy pipe fitting in a state of clamping the ultralong special-shaped titanium alloy thin-wall pipe fitting.
In the figure: 1-lathe fixture, 2-lathe chuck, 3-movable jaw, 4-ultra-long special-shaped titanium alloy thin-wall pipe fitting, 5-cushion block, 6-rear tip, 7-clamping block and 8-spring piece.
Detailed Description
Various exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is not intended to limit the invention, its application, or uses. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It should be noted that: the relative arrangement of parts and steps set forth in these embodiments should be construed as exemplary only and not as limiting unless otherwise specifically noted.
As shown in fig. 1-3, in one aspect of the present invention, a lathe fixture suitable for an ultra-long thin-walled special-shaped titanium alloy pipe is provided, which includes at least two clamping blocks 7 and a spring leaf 8 connected between the clamping blocks 7, the clamping blocks 7 and the spring leaf 8 are connected to each other to form an annular lathe fixture 1, an inner surface of the lathe fixture 1 is used for matching with an ultra-long special-shaped titanium alloy thin-walled pipe 4 to be clamped, an outer surface of the lathe fixture 1 is used for matching with a movable jaw 3 of a lathe, and the spring leaf 8 can extend and contract along a circumferential direction of the lathe fixture 1 to adjust a radial position of the clamping blocks 7.
Therefore, the lathe fixture 1 is connected between the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 to be clamped and the movable clamping jaw 3 of the lathe, so that the condition that the workpiece is deformed under the action of assembly stress of the thin-wall pipe workpiece can be avoided, and the problems that the outer circle surface of the workpiece generates indentation and flattening deformation due to the radial clamping force of the movable clamping jaw 3 are solved.
In addition, the lathe fixture 1 of the invention enables the lathe fixture 1 to have certain size elasticity under the action of the spring piece 8 by connecting the telescopic spring piece 8 between the clamping blocks 7, so that the lathe fixture 1 has certain applicability to the ultra-long special-shaped titanium alloy thin-walled pipe fitting 4 within a certain size range, and further can reduce the production cost of the ultra-long special-shaped titanium alloy thin-walled pipe fitting 4 and improve the production efficiency.
Preferably, the outer wall surface of the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 to be clamped is a cylindrical surface, the inner surface of the clamping block 7 is at least one part of the cylindrical surface, the diameter of the inner surface of the clamping block 7 is not smaller than the outer diameter of the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 to be clamped, and the length of the inner surface of the clamping block 7 in the axial direction is not larger than the length of the movable clamping jaw 3 of the lathe in the axial direction.
The outer wall surface of the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 to be clamped and the inner surface of the clamping block 7 are cylindrical surfaces, so that the outer wall surface of the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 and the inner surface of the clamping block 7 can be in complete contact and close fit, and the lathe fixture 1 can clamp the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 more firmly.
Preferably, the assembly surface of the movable jaw 3 of the lathe is at least a part of a cylindrical surface, the outer surface of the clamping block 7 is at least a part of a spherical surface, the diameter of the outer surface of the clamping block 7 is not more than the inner diameter of the movable jaw 3 of the lathe, and the spherical center of the outer surface of the clamping block 7 coincides with the central symmetry point of the lathe fixture 1.
The assembly surface of the movable clamping jaw 3 of the lathe is a cylindrical surface, the outer surface of the clamping block 7 is a spherical surface, and the assembly surface of the movable clamping jaw 3 of the lathe is in line contact with the outer surface of the clamping block 7 when the assembly surface of the movable clamping jaw is matched with the outer surface of the clamping block. On the basis, when the overlong special-shaped titanium alloy thin-wall pipe fitting 4 bears cutting torque in the turning process, a certain relative displacement can be generated between the spherical surface of the outer surface of the clamping block 7 and the movable clamping jaw 3 of the turning machine, so that the internal stress generated in the machining process of the overlong special-shaped titanium alloy thin-wall pipe fitting 4 can be released by utilizing the displacement between the clamping block 7 and the movable clamping jaw 3, and the workpiece deformation is avoided.
Preferably, the central axes of the inner surface and the outer surface of the clamping block 7 are arranged in parallel, so that the axial direction of the overlong special-shaped titanium alloy thin-walled tube 4 positioned by the inner surface of the clamping block 7 is ensured to be parallel to the axial direction of the movable jaw 3 of the lathe positioned by the outer surface of the clamping block 7, and the processing precision of the overlong special-shaped titanium alloy thin-walled tube 4 is further improved.
In a preferred embodiment, the clamping block 7 and the spring plate 8 in the lathe fixture 1 are formed by cutting the same annular structural member, wherein the spring plate 8 is formed by oppositely cutting and connecting the edges of the cut areas between the areas corresponding to the clamping block 7. From this, clamping piece 7 and spring leaf 8 will have more the wholeness, make the inside and outside surface of clamping piece 7 and spring leaf 8 more unified to avoid the clamping piece 7 that is formed by different materials processing and spring leaf 8 at the problem that the inside and outside surface is not unified that the inter combination in-process leads to appearing, and then improve the processing positioning accuracy to overlength heterotypic titanium alloy thin-walled tube spare 4.
Preferably, the spring plate 8 is made in a ring-shaped configuration cut axially towards each other and with the edges of the cut areas joined. Because two terminal surfaces of annular structure are the plane, consequently use two terminal surfaces of annular structure as the location benchmark, it is more convenient and the more meticulous positioning process of the course of working of cutting out spring leaf 8 along the axial.
Specifically, the spring plate 8 is made of an annular structure by a wire cut electrical discharge machining technology, so that a cutting path can be planned more accurately by adopting a computer programming mode, on one hand, the sufficient depth of a cutting area is ensured, and on the other hand, the phenomenon that the edge of the cutting area is cut off to influence the connection effect of the spring plate 8 on the clamping block 7 is prevented.
In a preferred embodiment, the spring plate 8 comprises at least three layers of plate structures distributed in a zigzag manner, so that a large enough expansion space is obtained, and the lathe fixture 1 can be suitable for more types or batches of ultra-long special-shaped titanium alloy thin-wall pipes 4.
In a preferred embodiment, the movable jaw 3 of the lathe is of a three-jaw structure, the number of the clamping blocks 7 is three, the three clamping blocks 7 are distributed at trisection positions of the lathe clamp 1, and the spring pieces 8 are distributed at trisection positions of the lathe clamp 1 at equal intervals. Therefore, after the lathe fixture 1 clamps the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4, each clamping block 7 can correspond to one movable clamping jaw 3 in the three-jaw structure, the movable clamping jaw 3 of the lathe is prevented from contacting with the spring piece 8 to influence the positioning stability, and the structure of the spring piece 8 is prevented from being damaged.
In another preferred embodiment, the number of clamping blocks 7 is four, and four clamping blocks 7 are distributed at the quartering position of the lathe jig 1, the number of spring pieces 8 is four, and four spring pieces 8 are distributed on a pair of orthogonal axes of the lathe jig 1. Therefore, the four spring pieces 8 are grouped in pairs, collinear position relation exists in the groups, vertical position relation exists between the groups, and the position relation characteristic can facilitate processing of the spring pieces 8.
Therefore, the lathe fixture suitable for the ultra-long thin-wall special-shaped titanium alloy pipe fitting is connected between the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 to be clamped and the movable clamping jaws 3 of the lathe, so that the condition that the thin-wall pipe workpiece deforms under the action of assembly stress can be avoided, and the problems that indentation and flattening deformation are generated on the outer circle surface of the workpiece due to the radial clamping force of the movable clamping jaws 3 are solved.
The outer surface of the clamping block 7 of the lathe fixture 1 is a spherical surface which can generate certain displacement when being matched with the movable clamping jaw 3 of the lathe, so that the machining stress generated in the machining process of the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 can be released by utilizing the displacement, and the deformation of a workpiece is avoided.
In addition, the lathe fixture 1 of the invention enables the lathe fixture 1 to have certain size elasticity under the action of the spring piece 8 by connecting the telescopic spring piece 8 between the clamping blocks 7, so that the lathe fixture 1 has certain applicability to the ultra-long special-shaped titanium alloy thin-walled pipe fitting 4 within a certain size range, and further can reduce the production cost of the ultra-long special-shaped titanium alloy thin-walled pipe fitting 4 and improve the production efficiency.
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 to 3, the technical solution adopted by the present invention to solve the problems proposed in the background art is: a lathe fixture suitable for an overlong thin-wall special-shaped titanium alloy pipe fitting comprises a spring piece 8 and a clamping block 7; the lathe fixture 1 is formed by machining spring pieces 8 which are connected by cutting drum-shaped metal rings with spherical outer surfaces at quartering positions in an opposite mode along the axial direction of the drum-shaped metal rings in an edge cutting mode by adopting a wire electrical discharge machining technology, inner holes of the drum-shaped metal rings are regular cylindrical holes, the inner diameter of each cylindrical hole is equal to the outer diameter of an ultra-long special-shaped titanium alloy thin-wall pipe 4 to be clamped, the inner diameter of each cylindrical hole is equal to the width of a movable clamping jaw 3, the spring pieces 8 are four groups of spring pieces 8 formed by wire electrical discharge machining, the side faces of the spring pieces 8 are of rectangular sawtooth structures, the spring pieces 7 and the clamping blocks 7 are connected with one another integrally, the clamping blocks 7 are formed by cutting the four groups of spring pieces 8 at the quartering positions of the drum-shaped metal rings, and the clamping blocks 7 and the spring pieces 8 are connected integrally.
The working principle of the invention is as follows: before use, firstly, sleeving the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 into an inner hole of a lathe fixture 1, then installing the lathe fixture 1 on a lathe chuck 2, rotating the lathe fixture 1 to enable the middle position of the drum-shaped surface to be opposite to a movable clamping jaw 3, screwing the movable clamping jaw 3, and tightening the lathe fixture 1, so that the clamping purpose of the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 is completed; and adjusting the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 to enable the axis of the ultra-long special-shaped titanium alloy thin-wall pipe fitting to be coincident with the rotation axis of the lathe spindle, then propping the cushion block 5 by using the rear center 6, and properly screwing the rear center 6 to enable the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 to be clamped and fixed. Therefore, the machining part of the overlong special-shaped titanium alloy thin-wall pipe fitting 4 can be precisely machined on a numerical control lathe.
The outer surface of the lathe holder 1 is a part of a spherical surface, the center of which coincides with the geometric center of the lathe holder 1 and is the central point of symmetry of the drum spring. The movable clamping jaw 3 is clamped on the outer surface of the lathe fixture 1, a contact point of the movable clamping jaw and the lathe fixture 1 forms an arc on the outer surface of the lathe fixture 1, the center of the arc is overlapped with the symmetrical center of the lathe fixture 1, and the arc is positioned on the rotating axis of the lathe spindle; the force of the movable jaw 3 acting on the circular arc is focused on the center of symmetry of the lathe holder 1 and is perpendicular to the axis of rotation of the lathe spindle, i.e. the clamping force of the movable jaw 3 acting on the lathe holder 1 is zero in the direction of the axis of rotation of the lathe spindle. The outer surface of the lathe clamp 1 is a spherical surface and can rotate around the symmetrical center together with the workpiece in a universal way under the clamping force of the movable clamping jaws 3. When the lathe fixture 1 is used for clamping a workpiece, the movable clamping jaws 3 are clamped on the outer surface of the workpiece, and clamping force is uniformly distributed on the outer surface of the workpiece through the lathe fixture 1, so that the workpiece is clamped more firmly, and meanwhile, the movable clamping jaws 3 are prevented from being in direct contact with the lathe fixture 1.
Compared with the prior art, the invention has the beneficial effects of at least one of the following:
the lathe fixture 1 is provided with four groups of spring pieces 8, so that the overlong special-shaped titanium alloy thin-wall pipe fitting 4 can be conveniently sleeved in. The inner hole of the lathe fixture 1 is a regular cylindrical hole, the surface of the inner hole is completely contacted with the outer wall of the ultra-long special-shaped titanium alloy thin-wall pipe 4 after the ultra-long special-shaped titanium alloy thin-wall pipe 4 is clamped, the fixing is firm and safe, and the condition that a workpiece slides and moves between the workpiece and the lathe fixture 1 does not exist. The outer surface of the lathe fixture 1 is drum-shaped and can rotate around the symmetrical center together with the workpiece in a universal mode, so that after the rear center 6 abuts against the other end of the workpiece, the assembly stress generated by bending the workpiece can be released in time, and the workpiece deformation caused by the release of the assembly stress after the turning of the workpiece is finished is effectively avoided.
In the turning and pin processing process, the acting force of the movable clamping jaw 3 along the rotation axis direction of the lathe spindle is zero, so that after the rear center 6 props against the other end of the workpiece, the lathe fixture 1 and the workpiece are displaced along the rotation axis direction of the lathe spindle under the action of the jacking force of the rear center 6, the assembly stress of the workpiece generated on the workpiece due to the action of the jacking force of the rear center 6 is eliminated in time, and the workpiece deformation caused by the release of the assembly stress after the turning processing of the workpiece is finished is effectively avoided.
The lathe fixture 1 prevents the movable clamping jaws 3 from directly contacting the outer circumferential surface of the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4, and the clamping force of the movable clamping jaws 3 is uniformly distributed on the outer circumferential surface of the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 through the lathe fixture 1, so that the problems that the movable clamping jaws 3 directly act on the outer circumferential surface of the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4, indentations are generated on the surface of the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4, and the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 is flattened and deformed are effectively solved, and the processing quality of the ultra-long special-shaped titanium alloy thin-wall pipe fitting 4 is ensured.
So far, some specific embodiments of the present invention have been described in detail by way of examples, but it should be understood by those skilled in the art that the above examples are only for illustrative purposes and are not intended to limit the scope of the present invention. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. The lathe fixture suitable for the ultra-long thin-wall special-shaped titanium alloy pipe is characterized by comprising at least two clamping blocks (7) and a spring piece (8) connected between the clamping blocks (7), wherein the clamping blocks (7) and the spring piece (8) are connected with each other to form an annular lathe fixture (1), the inner surface of the lathe fixture (1) is used for being matched with the ultra-long special-shaped titanium alloy thin-wall pipe (4) to be clamped, the outer surface of the lathe fixture (1) is used for being matched with a movable clamping jaw (3) of a lathe, and the spring piece (8) can stretch along the circumferential direction of the lathe fixture (1) to adjust the radial position of the clamping blocks (7).
2. The lathe fixture according to claim 1, wherein the outer wall surface of the ultra-long special-shaped titanium alloy thin-wall pipe (4) to be clamped is a cylindrical surface, the inner surface of the clamping block (7) is at least a part of the cylindrical surface, the diameter of the inner surface of the clamping block (7) is not less than the outer diameter of the ultra-long special-shaped titanium alloy thin-wall pipe (4) to be clamped, and the length of the inner surface of the clamping block (7) in the axial direction is not more than the length of a movable clamping jaw (3) of the lathe in the axial direction.
3. Lathe fixture according to claim 1, characterized in that the fitting surface of the movable jaw (3) of the lathe is at least a part of a cylindrical surface, the outer surface of the clamping block (7) is at least a part of a spherical surface, the diameter of the outer surface of the clamping block (7) is not larger than the inner diameter of the movable jaw (3) of the lathe, and the spherical center of the outer surface of the clamping block (7) coincides with the central symmetry point of the lathe fixture (1).
4. Lathe clamp according to claim 3, characterized in that the central axes of the inner and outer surfaces of the clamping block (7) are arranged parallel to each other.
5. The lathe clamp according to claim 1, characterized in that the clamping block (7) and the spring plate (8) in the lathe clamp (1) are formed by cutting the same annular structural member, wherein the spring plate (8) is formed by oppositely cutting and connecting the edges of the cut areas between the areas corresponding to the clamping block (7).
6. Lathe fixture according to claim 5, characterized in that the spring plate (8) is made of said ring-shaped structures cut axially towards each other and with their edges connected.
7. Lathe fixture according to claim 5, characterized in that the spring plate (8) is made for the ring-shaped structure by wire-cut electrical discharge machining.
8. The lathe clamp according to claim 5, wherein the spring plate (8) comprises a sheet structure of at least three layers in a zigzag distribution.
9. The lathe fixture according to claim 1, characterized in that the movable jaw (3) of the lathe is of a three-jaw structure, the number of the clamping blocks (7) is three, the three clamping blocks (7) are distributed at trisection positions of the lathe fixture (1), and the spring pieces (8) are distributed at trisection positions of the lathe fixture (1) at equal intervals.
10. The lathe clamp according to claim 1, wherein the number of the clamping blocks (7) is four, and four clamping blocks (7) are distributed at the quartering position of the lathe clamp (1), the number of the spring pieces (8) is four, and four spring pieces (8) are distributed on a pair of orthogonal axes of the lathe clamp (1).
CN202111243923.6A 2021-10-26 2021-10-26 Lathe fixture suitable for overlong thin-wall special-shaped titanium alloy pipe fitting Pending CN114211282A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111243923.6A CN114211282A (en) 2021-10-26 2021-10-26 Lathe fixture suitable for overlong thin-wall special-shaped titanium alloy pipe fitting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111243923.6A CN114211282A (en) 2021-10-26 2021-10-26 Lathe fixture suitable for overlong thin-wall special-shaped titanium alloy pipe fitting

Publications (1)

Publication Number Publication Date
CN114211282A true CN114211282A (en) 2022-03-22

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Application Number Title Priority Date Filing Date
CN202111243923.6A Pending CN114211282A (en) 2021-10-26 2021-10-26 Lathe fixture suitable for overlong thin-wall special-shaped titanium alloy pipe fitting

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