Clamp for machining rifling of thin-walled titanium tube

Abstract

The utility model provides a kind of fixture of thin-wall titanium tube rifling processing, the purpose is to solve the technical problem that existing thin-wall titanium tube is easily deformed by machine tool clamping when processing internal thread hole.This application is matched and set in the clamping sleeve of titanium tube outer wall;Pin is connected to titanium tube outer wall by passing through clamping sleeve, and is used for the movement limit of titanium tube in clamping sleeve;Centering element includes taper sleeve and cap, wherein, taper sleeve is installed between titanium tube one end and clamping sleeve one end;Cap is matched and connected to the outer wall of clamping sleeve one end by thread, to straighten titanium tube center line to with clamping sleeve center line alignment.This application is assembled with clamping sleeve on the outer wall of thin-wall titanium tube, then clamped by machine tool to process, avoid the phenomenon that thin-wall titanium tube is deformed by clamping;Through clamping sleeve, the movement of titanium tube in it is transversely limited, pin limits the circumferential movement of titanium tube in clamping sleeve, and centering element automatically corrects titanium tube center line, and the combination does not move in processing process, to further guarantee the quality of part processing.

Description

Technical Field

[0001] This application relates to machine tool components, and more particularly to a fixture for machining the rifling of thin-walled titanium tubes. Background Technology

[0002] Currently, the machining of threaded inner holes in pipe parts is typically performed on a dedicated spiral broaching machine. To facilitate machining, the pipe is often clamped by the machine's built-in center rest before drilling. The clamping process involves placing the pipe on the center rest, supported at two points below and clamped at the top by a clamping device to restrict its rotational and X-axis degrees of freedom. Simultaneously, one end of the pipe is pressed down by a pressure plate to restrict its Z-axis degree of freedom. These methods ensure reliable clamping and guarantee machining quality.

[0003] However, the above clamping method is suitable for pipe parts with thick walls and large diameters (above 10mm). When applied to the processing of thin-walled pipe parts, the clamping force transmitted by the clamping device held at the top of the pipe is very easy to deform it. Once the part is deformed, it will result in the inability to process or inconsistent helix angle of the inner wall spiral groove. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a fixture for machining thin-walled titanium tube rifling, comprising:

[0005] Titanium tube;

[0006] A jacket is fitted onto the outer wall of the titanium tube.

[0007] A locking pin passes through the jacket and is connected to the outer wall of the titanium tube, used to limit the movement of the titanium tube within the jacket;

[0008] Centering components include:

[0009] A tapered sleeve is installed between one end of the titanium tube and one end of the jacket.

[0010] The cap, which is threadedly connected to the outer wall of one end of the jacket, is used to align the center line of the titanium tube with the center line of the jacket.

[0011] Furthermore, the outer wall of the titanium tube is provided with a positioning groove; the outer wall of the jacket is provided with a positioning hole that matches the positioning groove; the two inner walls of the positioning groove can be flush with the two inner walls of the positioning hole of the jacket respectively, so as to position the assembly position of the locking pin at the jacket.

[0012] Furthermore, the locking pin is installed on the outer wall of the jacket that circumferentially covers the positioning hole.

[0013] Furthermore, the outer wall of the locking pin is threaded to the sleeve, and the locking pin cooperates with the nut to lock onto the outer wall of the sleeve.

[0014] Furthermore, the titanium tube is provided with a insertion groove that matches the end of the locking pin.

[0015] Furthermore, the bottom of the insertion slot is provided with a first threaded post, and there is a rotation space between the first threaded post and the insertion slot; the end of the locking pin is provided with a limiting groove that matches the first threaded post, so that the first threaded post is threadedly connected in the limiting groove.

[0016] Furthermore, the end of the conical sleeve is divided into two identical half-conical sleeves along its longitudinal section, and the conical sleeve and the clamp are gradually brought into close contact through the cap to clamp the titanium tube.

[0017] Furthermore, the titanium tube is divided into a thick tube section, a connecting tube section, a thin tube section, and an extension tube section from one end to the other. The diameter of the thick tube section is larger than the diameter of the connecting tube section, the extension tube section, and the thin tube section. The diameter of the extension tube section is smaller than the diameter of the thin tube section. A positioning groove is formed on the outer wall of the thick tube section. The centering component is matched and installed on the thin tube section, and one end of the thin tube section passes through the cap.

[0018] Furthermore, the jacket has a moving channel along its centerline that is identical to that of the titanium tube; the moving channel includes:

[0019] The first channel section is fitted onto the outer wall of the thick tube section;

[0020] The second channel portion is sleeved on the outer wall of the connecting tube portion and the thin tube portion. The diameter of the second channel portion is smaller than that of the first channel portion, so as to restrict the movement of the thick tube portion within the jacket within the first channel portion.

[0021] Furthermore, the pressure plate is pressed against the inner wall of the positioning groove near the connecting pipe and is connected to the inner wall of the positioning groove by bolts.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] (1) This application avoids the problem of deformation when machining the inner wall spiral groove of thin-walled titanium alloy tube parts by assembling a jacket on the outer wall of the thin-walled titanium tube and then clamping and processing it by a machine tool.

[0024] (2) This application achieves the positioning between the threaded hole of the jacket and the insertion slot of the titanium tube by laterally limiting the movement of the titanium tube in the jacket and adjusting the alignment between the positioning groove and the positioning hole, thereby facilitating the quick positioning and assembly of the titanium tube by the locking pin to limit the circumferential movement. Furthermore, the centering component and the assembly at the jacket automatically correct the center line of the titanium tube in the jacket. In addition, the pressure plate presses the titanium tube to further increase the stability of the jacket in holding the titanium tube, thereby ensuring that the assembly does not move during the processing and thus ensuring the quality of the parts processing. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a front view schematic diagram of a fixture for machining thin-walled titanium tube rifling according to an embodiment of this application;

[0027] Figure 2 This is a side view along the A-A' direction of a fixture for machining the rifling of a thin-walled titanium tube according to an embodiment of this application.

[0028] Figure 3 This is a bottom view of a titanium tube for a fixture used for rifling thin-walled titanium tubes according to an embodiment of this application.

[0029] Figure 4 This is a front view schematic diagram of the clamping sleeve of a fixture for machining thin-walled titanium tube rifling according to an embodiment of this application;

[0030] Figure 5 This is a front view schematic diagram of the locking pin of a fixture for machining thin-walled titanium tube rifling according to an embodiment of this application;

[0031] Figure 6 This is a front view schematic diagram of the tapered sleeve of a fixture for machining thin-walled titanium tube rifling according to an embodiment of this application;

[0032] Figure 7 This is a side view of the cap of a jig for machining the rifling of a thin-walled titanium tube according to an embodiment of this application, along the A-A' direction.

[0033] Figure label:

[0034] 10. Thick tube section; 100. Insertion groove; 101. First threaded post; 102. Positioning groove; 11. Connecting tube section; 12. Thin tube section; 13. Extension tube section;

[0035] 2. Jacket; 20. First channel section; 200. Threaded hole; 201. Positioning hole; 202. Large end of jacket; 21. Second channel section; 22. Tapered inner hole; 220. Small end of jacket;

[0036] 3. Locking pin; 30. Second threaded post; 31. Limiting post; 310. Limiting groove;

[0037] 40. Conical sleeve; 400. Half-conical sleeve; 41. Connecting cap;

[0038] 5. Pressure plate. Detailed Implementation

[0039] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0040] In the description of this utility model, it should be understood that the terms "center", "top", "bottom", "inner", "outer", "axial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] The following disclosure provides many different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the present invention. Furthermore, reference numerals may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments discussed. In addition, examples of various specific processes and materials are provided in the present invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0045] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0046] This utility model embodiment provides a fixture for machining rifling on thin-walled titanium tubes. Please refer to [reference needed]. Figures 1-7 The fixture for machining the rifling of the thin-walled titanium tube includes a titanium tube, a jacket 2, a locking pin 3, a pressure plate 5, and a centering component.

[0047] Specifically,

[0048] The titanium tube is divided into a thick tube section 10, a connecting tube section 11, a thin tube section 12, and an extension tube section 13 from one end to the other. The diameter of the thick tube section 10 is larger than the diameter of the connecting tube section 11, the extension tube section 13, and the thin tube section 12; the diameter of the extension tube section is smaller than the diameter of the thin tube section. A positioning groove 102 is formed on the outer wall of the thick tube section, and an insertion groove 100 is formed in the area of ​​the outer wall of the thick tube section 10 covered by the positioning groove 102.

[0049] The large end 202 of the jacket extends into the titanium tube through the extension section 11. The small end 220 of the jacket is provided with a tapered inner hole 22. A moving channel with the same structure as the titanium tube is formed along its centerline inside the jacket 2, and the moving channel communicates with the tapered inner hole 22. The moving channel includes a first channel section 20 and a second channel section 21. The first channel section 20 is fitted onto the outer wall of the thick tube section, and the second channel section 21 is fitted onto the outer wall of the connecting tube section 11 and the thin tube section 12. The design that the diameter of the first channel section 20 is larger than the diameter of the second channel section 21 restricts the movement space of the thick tube section 10 within the jacket to the first channel section 20. When the titanium tube moves to the point where the end of its thick tube section 10 connects with the bottom end of the first channel section, it cannot move further. At this time, the thin tube section 12 penetrates through the tapered inner hole 22.

[0050] The outer wall of the large end 202 of the jacket is provided with a positioning hole 201 that matches the positioning groove 102, so that the two inner walls of the positioning groove 102 in the extension direction of the titanium tube can be flush with the corresponding two inner walls of the positioning hole 201 of the jacket. The outer wall of the jacket is provided with a threaded hole 200 that matches the insertion groove 100, that is, when the jacket 2 is positioned and clamped on the outer wall of the titanium tube, the center line of the threaded hole 200 of the jacket can be aligned with the center line of the bottom of the insertion groove 100 of the titanium tube. In other words, by rotating the titanium tube, the positioning groove 102 and the positioning hole 201 can be adjusted to align, so that the center line of the threaded hole 200 of the jacket is aligned with the center line of the bottom of the insertion groove 100 of the titanium tube. The outer wall of the small end 220 of the jacket is provided with a first threaded portion.

[0051] The locking pin 3 includes a second threaded post 30 and a limiting post 31. The outer wall of the second threaded post 30 has a second threaded portion and a third threaded portion. The second threaded post 30 is threadedly connected to the jacket 2 through the second threaded portion engaging with the threaded hole 200. One end of the limiting post is fixed to the second threaded post 30. The limiting post 31 and the second threaded post 30 are coaxially arranged. The other end of the limiting post can extend into the insertion groove 100 through the threaded hole 200 of the jacket 2. At this time, the third threaded portion is exposed outside the jacket, allowing the locking pin 3 to be locked to the outer wall of the jacket through engagement with the nut.

[0052] Preferably, the bottom of the insertion groove 100 is provided with a first threaded post 101, and there is a rotation space between the first threaded post 101 and the insertion groove 100. A limiting groove 310 matching the first threaded post is provided on the end face of the other end of the limiting post, so that the first threaded post 101 is threadedly connected to the limiting groove 310. When the locking pin 3 enters the insertion groove 100 through the threaded hole 200, the limiting post 31 continues to move into the insertion groove 100 by rotating the second threaded post 30 until the limiting groove 310 of the limiting post 31 is threadedly connected to the outer wall of the first threaded post 101, thereby circumferentially restricting the titanium tube inside the jacket 2.

[0053] Based on this, the titanium tube enters the jacket 2 from the large end 202 towards the small end 220, stopping when its thicker end connects with the bottom of the first channel. At this time, the titanium tube is rotated to align the positioning groove 102 and the positioning hole 210, and the limiting post 31 of the locking pin 3 enters the insertion groove 100 through the threaded hole 200 of the jacket 2. The locking pin 3 is rotated until its limiting groove 310 is threadedly connected to the first threaded post 101, and then a nut is installed on the part of the locking pin that is exposed outside the jacket 2 to lock it.

[0054] The pressure plate 5 is pressed against the inner wall of the positioning groove 102 near the connecting pipe part 11 and is connected to the positioning groove 102 by bolts to further enhance the stability of the jacket 2 in clamping the titanium tube. Preferably, the pressure plate 5 is arranged on both sides of the center line of the jacket 2.

[0055] The centering component includes a tapered sleeve 40 and a cap 41. The tapered sleeve 40 is designed to match the tapered inner hole 22 of the clamp 2, and its end is divided into two identical half-tapered sleeves 400 along its longitudinal section. The cap 41 is threaded to the outer wall of the small end 220 of the clamp and passes through the thin tube 12. That is, when the clamp 2 is positioned and clamped on the outside of the titanium tube, and the tapered sleeve 40 is installed in the tapered inner hole of the clamp 2, the cap 41 is assembled on the small end 220 of the clamp, so that the tapered sleeve 40 and the clamp 2 gradually fit tightly to clamp the titanium tube, and the titanium tube is automatically straightened so that its center line coincides with the center line of the clamp 2, ensuring reliable clamping of the titanium tube.

[0056] Based on the above embodiments, the working principle of this application is as follows:

[0057] Place the titanium tube into the jacket 2 and move it along the moving channel until the end of its thick tube section connects with the bottom of the first channel section. Rotate the titanium tube to align the positioning groove 102 and the positioning hole 201. Insert the locking pin 3 into the jacket 2 and rotate the locking pin 3 to circumferentially limit the titanium tube. Install the tapered sleeve 40 and the cap 41 respectively. Use a wrench to tighten them to restrict the freedom of the titanium tube in the X, Y, and Z directions. Finally, assemble the pressure plate 5 into the positioning groove 102 to complete the assembly between the titanium tube and the jacket 2.

[0058] The above-mentioned combined fixture is placed on the machine tool with the end with the cap 41 facing the machine tool spindle. It is supported on the machine tool center frame by the outer circle of the sleeve 2, and the assembly is fixed and clamped by the clamping plate on the machine tool center frame and the pressure plate at the tail end, so as to ensure that the assembly does not move during the processing and thus ensure the processing quality of the parts.

[0059] Based on the above embodiments, the advantages of this application are:

[0060] (1) This application avoids the problem that the thin-walled titanium tube is not in direct contact with the support points of the HAF and the center frame by assembling a jacket 2 on the outer wall of the thin-walled titanium tube and then clamping and processing it by a machine tool. This solves the problem that the thin-walled titanium tube is prone to deformation when processing the inner wall spiral groove of the thin-walled titanium alloy tube parts.

[0061] (2) This application achieves the positioning between the threaded hole 200 of the jacket and the insertion groove 100 of the titanium tube by laterally limiting the movement of the titanium tube in the jacket 2 and adjusting the alignment between the positioning groove 102 and the positioning hole 201, thereby facilitating the quick positioning and assembly of the titanium tube by the locking pin 3 to limit the circumferential position; and automatically corrects the center line of the titanium tube in the jacket 2 by the centering component and the assembly at the jacket 2, and further increases the stability of the jacket 2 in clamping the titanium tube by pressing the pressure plate 5, thereby ensuring that the assembly does not move during the processing, and thus ensuring the processing quality of the parts.

Claims

1. A fixture for machining rifling on thin-walled titanium tubes, characterized in that, It includes: Titanium tube; A jacket is fitted onto the outer wall of the titanium tube. A locking pin passes through the jacket and is connected to the outer wall of the titanium tube, used to limit the movement of the titanium tube within the jacket; Centering components include: A tapered sleeve is installed between one end of the titanium tube and one end of the jacket. The cap, which is threadedly connected to the outer wall of one end of the jacket, is used to align the center line of the titanium tube with the center line of the jacket.

2. The fixture for machining thin-walled titanium tube rifling according to claim 1, characterized in that: The outer wall of the titanium tube is provided with a positioning groove; the outer wall of the jacket is provided with a positioning hole that matches the positioning groove; the two inner walls of the positioning groove can be flush with the two inner walls of the positioning hole of the jacket respectively, so as to locate the assembly position of the locking pin at the jacket.

3. The fixture for machining thin-walled titanium tube rifling according to claim 2, characterized in that: The locking pin is installed on the outer wall of the jacket that covers the circumference of the positioning hole.

4. The fixture for machining thin-walled titanium tube rifling according to claim 2, characterized in that: The outer wall of the locking pin is threaded to the sleeve, and the locking pin cooperates with the nut to lock it to the outer wall of the sleeve.

5. The fixture for machining thin-walled titanium tube rifling according to claim 4, characterized in that: The titanium tube is provided with a insertion groove that matches the end of the locking pin.

6. The fixture for machining thin-walled titanium tube rifling according to claim 5, characterized in that: The bottom of the insertion slot is provided with a first threaded post, and there is a rotation space between the first threaded post and the insertion slot; the end of the locking pin is provided with a limiting groove that matches the first threaded post, so that the first threaded post is threadedly connected in the limiting groove.

7. The fixture for machining thin-walled titanium tube rifling according to claim 1, characterized in that: The end of the conical sleeve is divided into two identical semi-conical sleeves along its longitudinal section. The cap is used to gradually bring the conical sleeve and the clamp into close contact to clamp the titanium tube.

8. The fixture for machining thin-walled titanium tube rifling according to claim 2, characterized in that: The titanium tube is divided into a thick tube section, a connecting tube section, a thin tube section, and an extension tube section from one end to the other. The diameter of the thick tube section is larger than that of the connecting tube section, the extension tube section, and the thin tube section. The diameter of the extension tube section is smaller than that of the thin tube section. A positioning groove is formed on the outer wall of the thick tube section. The centering component is matched and installed on the thin tube section, and one end of the thin tube section passes through the cap.

9. The fixture for machining thin-walled titanium tube rifling according to claim 8, characterized in that: The jacket has a moving channel along its centerline that is identical to that of the titanium tube; the moving channel includes: The first channel section is fitted onto the outer wall of the thick tube section; The second channel portion is sleeved on the outer wall of the connecting tube portion and the thin tube portion. The diameter of the second channel portion is smaller than that of the first channel portion, so as to restrict the movement of the thick tube portion within the jacket within the first channel portion.

10. The fixture for machining thin-walled titanium tube rifling according to claim 9, characterized in that, It also includes: A pressure plate is pressed against the inner wall of the positioning groove near the connecting pipe and is connected to the inner wall of the positioning groove by bolts.

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