Tool for precisely polishing slender thin-walled tube

Abstract

The utility model provides a tool for precise polishing of a slender thin-walled tube, which comprises a copper screw rod, a bakelite plug I, an elastic sheet I, an elastic sheet II, a bakelite plug II and a copper sleeve, and the elastic sheet I and the elastic sheet II have a conductive function and are arranged on the copper screw rod at an interval; the copper screw is coaxially sleeved with a machining workpiece, and the inner wall of the machining workpiece makes contact with the elastic piece I and the elastic piece II for electric conduction. The two ends of a machining workpiece are fixedly connected with the copper screw in a sealed mode through a bakelite plug I and a bakelite plug II respectively. The copper sleeve is connected to one end of the copper screw rod, and a conductive wire is connected to the copper sleeve. According to the utility model, the conductive stability in the processing process can be ensured, and the problems of poor conductivity, virtual connection and the like are solved; and the sealing performance is good, electrolyte is effectively prevented from permeating into the workpiece, and the interior of the thin-walled tube is prevented from being corroded by the electrolyte.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and in particular to a tool for precision polishing of slender, thin-walled tubes. Background Technology

[0002] Slender, thin-walled tubing is widely used in aerospace, nuclear power, and semiconductor industries. These tubing components are typically made from difficult-to-machine materials, and their large length-to-diameter ratio and thin wall thickness make processing challenging. Traditional machining methods are commonly used in the forming process; these methods are contact-based, resulting in poor surface quality, including mechanical damage layers, residual stress, and fragmented grain layers, which negatively impact the normal use of the thin-walled tube.

[0003] Electrochemical machining removes material based on the principle of anodic dissolution. It is unaffected by the strength and hardness of the workpiece material. As it is a non-contact machining process, no residual stress or deformation is generated during the process, ensuring the removal of residual stress layers on the surface of thin-walled tubes. It has significant advantages for machining slender, thin-walled tubes.

[0004] Common electrochemical polishing apparatuses have several drawbacks. First, they struggle to balance conductivity and workpiece protection, easily leading to over-polishing of workpiece end faces and non-machined areas. Second, the workpiece clamping process is cumbersome and lacks adaptability, increasing experimental complexity. Third, they cannot accurately position thin-walled tubular workpieces, affecting experimental results. Fourth, insufficient sealing allows electrolyte to seep into the workpiece, damaging its internal surface. Utility Model Content

[0005] In response to the aforementioned technical problems, a tool for precision polishing of slender, thin-walled tubes is provided.

[0006] The technical means adopted in this utility model are as follows:

[0007] A tool for precision polishing of slender, thin-walled tubes includes: a copper screw, a bakelite plug I, a spring I, a spring II, a bakelite plug II, and a copper sleeve. Spring I and spring II are conductive and are spaced apart on the copper screw. The workpiece is coaxially sleeved outside the copper screw, and its inner wall is in contact with spring I and spring II for electrical conductivity. Both ends of the workpiece are sealed and fixedly connected to the copper screw via bakelite plugs I and II, respectively. The copper sleeve is connected to one end of the copper screw, and a conductive wire is connected to the copper sleeve.

[0008] Furthermore, the spring piece I is installed in the upward position in the middle of the copper screw. The spring piece I is composed of a flat piece I and a plurality of circumferentially distributed strips I. One end of each of the plurality of strips I is connected to the flat piece I. The plurality of strips I are inclined outward and spread outward, forming a space inside the plurality of strips I.

[0009] The outer end face of the flat plate I, away from the strip I, contacts the nut III, which is threaded onto the copper screw. A stainless steel capillary tube I is fitted onto the copper screw, and the stainless steel capillary tube I is placed in the space. One end of the stainless steel capillary tube I contacts the inner end face of the spring plate I, and the other end contacts the nut II, which is threaded onto the copper screw. By tightening the nut II and the nut III, the spring plate I is fixed onto the copper screw.

[0010] Furthermore, the spring piece II is installed in the downward position in the middle of the copper screw. The spring piece II is composed of a flat piece II and a plurality of circumferentially distributed strips II. One end of each of the plurality of strips II is connected to the flat piece II. The plurality of strips II are inclined outward and spread outward, forming a space inside the plurality of strips II.

[0011] The outer end face of the flat plate II, away from the strip II, contacts the nut V, which is threaded onto the copper screw. A stainless steel capillary tube II is fitted onto the copper screw, and the stainless steel capillary tube II is placed in the space. One end of the stainless steel capillary tube II contacts the inner end face of the spring plate II, and the other end contacts the nut IV, which is threaded onto the copper screw. The spring plate II is fixed onto the copper screw by tightening the nuts IV and V.

[0012] Furthermore, one end of the bakelite plug I is inserted into the inner hole of one end of the workpiece, and the other end is fixedly connected to the copper screw by nut I.

[0013] Furthermore, the bakelite plug I has a stepped structure, and an O-ring I is fitted on the stepped part of the bakelite plug I. The O-ring I is connected between one end of the workpiece and the stepped part of the bakelite plug I.

[0014] Furthermore, one end of the bakelite plug II is inserted into the inner hole of the other end of the workpiece, and the other end is fixedly connected to the copper screw by nut VI.

[0015] Furthermore, the bakelite plug II has a stepped structure, and an O-ring II is fitted on the stepped part of the bakelite plug II. The O-ring II is connected between the other end of the workpiece and the stepped part of the bakelite plug I.

[0016] Furthermore, the copper sleeve has a through hole, one end of the copper screw passes through the through hole, a through groove communicating with the through hole is opened at the center line of the copper sleeve, and a threaded through hole perpendicular to the through groove is opened on the side of the copper sleeve. An internal hex bolt I is connected in the threaded through hole. By tightening the internal hex bolt I, the groove gap at the center line of the copper sleeve is reduced, thereby achieving the locking of the copper screw.

[0017] Furthermore, the upper end face of the copper sleeve has a threaded hole, and an internal hex bolt II is connected inside the threaded hole. A washer is fitted on the internal hex bolt II, and the wire is locked by the internal hex bolt II and the washer.

[0018] Furthermore, the non-processed areas of the workpiece are wrapped with Teflon tape.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The tool for precision polishing of slender thin-walled tubes provided by this utility model can ensure the stability of electrical conductivity during processing and solve problems such as poor conductivity and loose connection.

[0021] 2. The tool for precision polishing of slender thin-walled tubes provided by this utility model has good sealing performance, effectively preventing electrolyte from seeping into the workpiece and avoiding corrosion of the thin-walled tube by the electrolyte.

[0022] 3. The tool for precision polishing of slender thin-walled tubes provided by this utility model can achieve precise positioning of the workpiece. During the processing, the tool and the workpiece are always kept in a coaxial state to ensure processing accuracy.

[0023] 4. The tool provided by this utility model for precision polishing of slender thin-walled tubes can realize electrolytic machining of thin-walled tubes in multiple positions and of various types. It is particularly suitable for the manufacture of high-precision thin-walled tubes in aerospace, nuclear power and other fields.

[0024] Based on the above reasons, this utility model can be widely promoted in fields such as the processing of thin-walled pipe fittings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0027] Figure 2 This is a cross-sectional view of the present invention.

[0028] Figure 3 This is a schematic diagram of the copper sleeve structure of this utility model.

[0029] Figure 4 This is a schematic diagram of a partial conductive structure of the spring sheet of this utility model.

[0030] Figure 5 This is a schematic diagram of the spring sheet structure of this utility model.

[0031] In the diagram: 1. Copper screw; 2. Nut I; 3. Bakelite plug I; 4. O-ring I; 5. Workpiece being machined; 6. Nut II; 7. Stainless steel capillary tube I; 8. Spring I; 9. Nut III; 10. Nut IV; 11. Spring II; 12. Stainless steel capillary tube II; 13. Nut V; 14. O-ring II; 15. Bakelite plug II; 16. Nut VI; 17. Socket headstock I; 18. Socket headstock II; 19. Washer; 20. Copper sleeve. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] This invention provides a tool for precision polishing of slender, thin-walled tubes, a fixture suitable for clamping and polishing the outer surface of slender, thin-walled tubes. This fixture has a good sealing structure, effectively solving the technical problem of electrolyte seepage into the thin-walled tube during traditional processing, while ensuring electrical conductivity stability during processing. Furthermore, it can be applied to thin-walled tubes of various lengths and diameters, exhibiting wide applicability.

[0034] This utility model discloses a tool for precision polishing of slender, thin-walled tubes, comprising an M4 copper screw 1, an M4 nut I 2, a bakelite plug I 3, an 11×1.6mm O-ring I 4, a workpiece 5, an M4 nut II 6, a 304 stainless steel capillary tube I 7, a spring I 8, an M4 nut III 9, an M4 nut IV 10, a spring II 11, a 304 stainless steel capillary tube II 12, an M4 nut V 13, an 11×1.6mm O-ring II 14, a bakelite plug II 15, an M4 nut VI 16, an M8×25mm socket head capillary bolt I 17, an M8×25mm socket head capillary bolt II 18, an M8 washer 19, and a copper sleeve 20.

[0035] Both springs are conductive and are spaced apart. The conductive springs are fixed to the copper screw 1 by nuts. The workpiece 5 is coaxially sleeved on the outside of the copper screw 1 and passes through the two conductive springs, so that the inner wall of the workpiece 5 contacts the springs for conductivity. Specifically: Spring piece I8 is installed in the middle of the copper screw 1 at an upward position. Spring piece I8 consists of a flat piece I and multiple circumferentially distributed strips I. The lower ends of the multiple strips I are all connected to the flat piece I. The multiple strips I are inclined outward and form a space inside the multiple strips I. The outer end face of the flat piece I away from the strips I (i.e., the lower end face in the figure) contacts the nut III9. The nut III9 is ​​threaded onto the copper screw 1. A stainless steel capillary tube I7 is sleeved on the copper screw 1. The stainless steel capillary tube I7 is placed in the space, and the lower end of the stainless steel capillary tube I7 contacts the inner end face of spring piece I8 (i.e., the upper end face in the figure), and the upper end contacts the nut II6. The nut II6 is threaded onto the copper screw 1. By tightening the nut II6 and the nut III9, spring piece I8 is fixed onto the copper screw 1. The spring piece II11 is installed in the downward-facing middle position of the copper screw 1. The spring piece II11 consists of a flat plate II and multiple circumferentially distributed strips II. The lower ends of the multiple strips II are connected to the flat plate II. The multiple strips II are inclined outward and form a space inside. The outer end face of the flat plate II away from the strips II (i.e., the lower end face in the figure) contacts the nut V13. The nut V13 is threaded onto the copper screw 1. A stainless steel capillary tube II12 is sleeved on the copper screw 1. The stainless steel capillary tube II12 is placed in the space, and the lower end of the stainless steel capillary tube II12 contacts the inner end face of the spring piece II11, and the upper end contacts the nut IV10. The nut IV10 is threaded onto the copper screw 1. The spring piece II11 is fixed onto the copper screw 1 by tightening the nut IV10 and the nut V13.

[0036] A bakelite plug is added to each of the upper and lower end faces of the workpiece 5. These two bakelite plugs are then sealed and fixed to the copper screw 1. An O-ring seals the bakelite plugs to the end faces of the workpiece 5. Finally, the outer ends of the bakelite plugs are tightened with nuts. Specifically, one end of bakelite plug I3 is inserted into the upper inner hole of the workpiece 5, and the other end is fixedly connected to the copper screw 1 via nut I2. Bakery plug I3 has a stepped structure, and an O-ring I4 is fitted onto the stepped portion of bakelite plug I3. The O-ring I4 connects the upper end of the workpiece 5 to the stepped portion of bakelite plug I3. One end of bakelite plug II15 is inserted into the lower inner hole of the workpiece 5, and the other end is fixedly connected to the copper screw 1 via nut VI16. The bakelite plug II15 has a stepped structure. An O-ring II14 is fitted on the stepped part of the bakelite plug II15. The O-ring II14 is connected between the lower end of the workpiece 5 and the stepped part of the bakelite plug I3.

[0037] A copper sleeve 20 is connected to the upper end of a copper screw 1, and a conductive wire is connected to the copper sleeve 20. The copper sleeve 20 has a through hole in the middle, through which the upper end of the copper screw 1 passes. The size of the through hole is determined by the outer diameter of the copper screw 1, facilitating the fixing of the copper sleeve 20 in the clamping position. A threaded hole is provided on the upper end face of the copper sleeve 20 to lock the conductive wire. A hexagon socket head cap screw II18 is connected inside the threaded hole, and a washer 19 is fitted on the hexagon socket head cap screw II18. The wire is locked by the hexagon socket head cap screw II18 and the washer 19. A through groove communicating with the through hole is provided at the center line of the copper sleeve 20. A threaded through hole perpendicular to the through groove is provided on the side of the copper sleeve 20. A hexagon socket head cap screw I17 is connected inside the threaded through hole. Tightening the hexagon socket head cap screw I17 reduces the groove gap at the center line of the copper sleeve 20, thereby locking the copper screw 1. The copper screw 1 is clamped by the threaded through hole and the screw, ensuring the stability of electrical conductivity during processing.

[0038] Workpiece 5 will have the areas requiring polishing exposed, while non-processed areas will be wrapped with Teflon tape to ensure they are not affected by electrolyte corrosion.

[0039] Preferably, the internal hex bolts and washers are made of corrosion-resistant materials to avoid corrosion by electrolyte during processing.

[0040] Preferably, the O-rings are made of fluororubber or silicone rubber.

[0041] Preferably, the parts contained in the tool can be replaced according to the size of different workpieces being processed.

[0042] The implementation process of this utility model is as follows, including:

[0043] Step 1: Install the spring piece I8 in the middle of the copper screw 1 at the upward position. The front end face (outer end face) of the flat piece I of the spring piece I8 is fixed by the M4 nut III9. Since the internal space of the spring piece I8 is small, it cannot be directly contacted and fixed with the nut II6. Therefore, the rear end face (inner end face) of the flat piece I of the spring piece I8 is indirectly fixed by the 304 stainless steel capillary tube I7. The other end of the 304 stainless steel capillary tube I7 is fixed by the M4 nut II6.

[0044] Step 2: Install the spring piece II11 in the downward-facing position in the middle of the copper screw 1. The front end face (outer end face) of the flat piece II of the spring piece II11 is fixed by the M4 nut V13. Since the internal space of the spring piece II11 is small, it cannot be directly contacted and fixed with the nut IV10. Therefore, the rear end face (inner end face) of the flat piece II of the spring piece II11 is fixed by the 304 stainless steel capillary tube II12. The other end of the 304 stainless steel capillary tube II12 is fixed by the M4 nut IV10.

[0045] Step 3: Insert the workpiece 5 through the narrow end of the spring II 11, so that both springs are located inside the workpiece 5.

[0046] Step 4: Place the 11×1.6mm O-ring I4 onto the stepped part of the bakelite plug I3, insert the thin end of the bakelite plug I3 into the inner hole of the workpiece 5, and fix the other end with the M4 nut I2.

[0047] Step 5: Place the 11×1.6mm O-ring II14 onto the step of the bakelite plug II15, insert the thin end of the bakelite plug II15 into the inner hole of the workpiece 5, and fix the other end with the M4 nut VI16.

[0048] Step Six: Pass the upper end of the copper screw 1 through the through hole of the copper sleeve 20. A 3mm through groove is designed at the center line of the copper sleeve 20. The groove gap at the center line of the copper sleeve 20 is reduced by tightening with an M8×25mm socket head cap screw I17 to clamp the copper screw 1.

[0049] Step 7: Tighten the positive terminal of the power supply to the copper sleeve 20 using an M8×25mm socket head cap screw II18, an M8 washer 19, and a bolt.

[0050] This invention can solve the problem of polishing the outer surface of slender thin-walled tubes, while protecting the unprocessed circumferential surface and unprocessed end surface to prevent damage to the unprocessed surface, and provides technical support for observing the changes in the microstructure characteristics of the thin-walled tube surface.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tool for precision polishing of an elongated thin-walled tube, characterized by, It includes: Copper screw (1), bakelite plug I (3), spring sheet I (8), spring sheet II (11), bakelite plug II (15) and copper sleeve (20), the spring sheet I (8) and spring sheet II (11) have the function of electric conduction, and are installed on the copper screw (1) at intervals;The workpiece (5) is coaxially sleeved outside the copper screw (1), and the inner wall of the workpiece (5) is in contact with the spring sheet I (8) and the spring sheet II (11) for electric conduction;The two ends of the workpiece (5) are respectively connected with the copper screw (1) through the bakelite plug I (3) and the bakelite plug II (15) for sealing and fixed connection;The copper sleeve (20) is connected to one end of the copper screw (1), and the copper sleeve (20) is connected with a wire for electric conduction.

2. The tool for precision polishing of an elongated thin-walled tube according to claim 1, wherein The spring sheet I (8) is installed at the upward position of the middle part of the copper screw (1), the spring sheet I (8) is composed of a flat sheet I and a plurality of strip I distributed in a circle, one end of the plurality of strip I is connected with the flat sheet I, the plurality of strip I is inclined and expanded outward, and the plurality of strip I forms a space inside. The outer end face of the flat sheet I away from the strip I is in contact with the nut III (9), and the nut III (9) is threadedly connected to the copper screw (1);The copper screw (1) is sleeved with a stainless steel capillary tube I (7), the stainless steel capillary tube I (7) is placed in the space, one end of the stainless steel capillary tube I (7) is in contact with the inner end face of the spring sheet I (8), and the other end is in contact with the nut II (6), and the nut II (6) is threadedly connected to the copper screw (1);The spring sheet I (8) is fixed on the copper screw (1) by tightening the nut II (6) and the nut III (9).

3. The tool for precision polishing of an elongated thin-walled tube according to claim 1, wherein The spring sheet II (11) is installed at the downward position of the middle part of the copper screw (1), the spring sheet II (11) is composed of a flat sheet II and a plurality of strip II distributed in a circle, one end of the plurality of strip II is connected with the flat sheet II, the plurality of strip II is inclined and expanded outward, and the plurality of strip II forms a space inside. The outer end face of the flat sheet II away from the strip II is in contact with the nut V (13), and the nut V (13) is threadedly connected to the copper screw (1);The copper screw (1) is sleeved with a stainless steel capillary tube II (12), the stainless steel capillary tube II (12) is placed in the space, one end of the stainless steel capillary tube II (12) is in contact with the inner end face of the spring sheet II (11), and the other end is in contact with the nut IV (10), and the nut IV (10) is threadedly connected to the copper screw (1);The spring sheet II (11) is fixed on the copper screw (1) by tightening the nut IV (10) and the nut V (13).

4. The tool for precision polishing of an elongated thin-walled tube according to claim 1, wherein One end of the bakelite plug I (3) is inserted into the inner hole of one end of the workpiece (5), and the other end is fixedly connected with the copper screw (1) through the nut I (2).

5. The tool for precision polishing of an elongated thin-walled tube according to claim 4, wherein The bakelite plug I (3) is in a stepped structure, the bakelite plug I (3) is sleeved with an O-shaped sealing ring I (4) at the step, and the O-shaped sealing ring I (4) is connected between the end of the workpiece (5) and the step of the bakelite plug I (3).

6. The tool for precision polishing of an elongated thin-walled tube according to claim 1, wherein One end of the bakelite plug II (15) is inserted into the inner hole of the other end of the workpiece (5), and the other end is fixedly connected with the copper screw (1) through the nut VI (16).

7. The tool for precision polishing of an elongated thin-walled tube according to claim 6, wherein The burl II (15) is in a stepped structure, and an O-shaped sealing ring II (14) is sleeved at the step of the burl II (15), and the O-shaped sealing ring II (14) is connected between the other end of the workpiece (5) and the step of the burl I (3).

8. The tool for precision polishing of an elongated thin-walled tube according to claim 1, wherein The copper sleeve (20) is provided with a through hole, and one end of the copper screw rod (1) penetrates through the through hole; the copper sleeve (20) is provided with a through groove at the center line and in communication with the through hole; the side surface of the copper sleeve (20) is provided with a threaded through hole perpendicular to the through groove; and the threaded through hole is connected with an inner hexagonal bolt I (17); the inner hexagonal bolt I (17) is tightened to reduce the gap of the groove at the center line of the copper sleeve (20), so as to lock the copper screw rod (1).

9. The tool for precision polishing of an elongated thin-walled tube according to claim 1, wherein The upper end surface of the copper sleeve (20) is provided with a threaded hole, and the threaded hole is connected with an inner hexagonal bolt II (18); the inner hexagonal bolt II (18) is sleeved with a gasket (19), and the inner hexagonal bolt II (18) and the gasket (19) lock the wire.

10. The tool for precision polishing of an elongated thin-walled tube according to claim 1, wherein The non-processing area of the workpiece (5) is wrapped with a Teflon tape.

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