Thin-wall pipe electrolytic turning machining device and pipe bidirectional clamping method

Abstract

The invention discloses a thin-wall pipe electrolysis turning machining device and a bidirectional pipe clamping method. The thin-wall pipe electrolysis turning machining device comprises an electrolysis cabin, and pipe clamping power mechanisms are arranged on the outer sides of a set of opposite side walls of the electrolysis cabin correspondingly; the pipe clamping power mechanism comprises a power carrier, a main shaft pipe and an electric brush mechanism, the main shaft pipe is provided with a rotating power source and a pipe end extending into the electrolysis cabin, and a cone chuck is detachably arranged at the pipe end; and the axial leads of the two main shaft pipes are collinear. A bidirectional clamping and locking synchronous linkage rotating driving structure is adopted, so that the rotating displacement precision of the thin-wall pipe is guaranteed, constant gap control is stable, and the electrolytic turning machining precision is remarkably improved. Through the design of the main shaft pipe with the pipe cavity, the loading requirements of the thin-wall pipes with different axial specifications are met, and the bidirectional clamping operation is relatively simple and convenient. The electric brush can be stably attached to the main shaft tube, the conduction contact area and the conduction stability are guaranteed, and the operation reliability of machining is maintained.

Description

Technical Field

[0001] This invention relates to an electrolytic turning apparatus for thin-walled pipes and a bidirectional clamping method for pipes, belonging to the technical field of precision machining of pipes. Background Technology

[0002] Electrochemical turning (ECT) is a branch of electrochemical machining, belonging to the category of non-traditional electrochemical machining technologies. Its core principle utilizes the anodic dissolution effect of metal to achieve workpiece shaping. Unlike the force-cutting nature of traditional mechanical turning, it is a stress-free and tool-wear-free machining method. In the field of precision machining, ECT has become an important process for processing thin-walled tubes due to its advantages such as no mechanical stress and high surface quality.

[0003] Electrolytic turning involves connecting the workpiece anode and the tool cathode with an electrolyte to form a closed circuit. Electrolytic products are carried away through the machining gap. Electrolytic turning of the outer diameter of pipes generally adopts a forward spraying method, where only the machining area comes into contact with the electrolyte. The outer diameter turning is achieved by controlling a constant gap between the electrolyte and the outer diameter of the pipe, resulting in better flatness after machining.

[0004] The main factors affecting the machining accuracy of the outer wall of the pipe are the concentricity of the pipe during rotation and the stability of the contact resistance. Similar to the structure of traditional mechanical turning, a clamping and rotating mechanism is also required to clamp and rotate the pipe. Traditional clamping generally uses a combination of a rotating power end and an ejector pin end, that is, a combination of active and passive power to drive rotation. Due to the thin-walled characteristics of thin-walled pipes, the structure of traditional ejector pins and mechanical chucks will exert a certain pressure on the thin-walled pipes, causing deformation and making it easy to produce eccentric vibrations, making it difficult to maintain a reliable constant gap.

[0005] In addition, the conductivity stability of the workpiece is also crucial to the machining quality. Traditional conductivity structures use dynamic contact, which is generally applied to the workpiece body or transmission structure. Its contact resistance is not stable enough, which can easily affect the quality of electrolytic turning. At the same time, traditional rotary power uses a master-slave power coordination method, and there is torque transmission at both ends of the axial direction, which can easily cause torque damage to thin-walled tubes and affect the product qualification rate. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art. In view of the problems that the traditional passive clamping method of ejector pin structure is prone to tube loss and cannot meet the constant gap accuracy, this invention proposes a thin-walled tube electrolytic turning processing device and a bidirectional tube clamping method.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An electrolytic turning apparatus for thin-walled tubes includes an electrolytic chamber, wherein a tube clamping power mechanism is provided on the outer side of a set of opposite sidewalls of the electrolytic chamber. The tube clamping power mechanism includes a power carrier, a main spindle tube with free rotational displacement mounted on the power carrier, and a brush mechanism in conductive contact with the main spindle tube. The main spindle tube has a rotational power source and a tube end that extends through the side wall into the electrolysis chamber. A tapered chuck for clamping thin-walled tubes is detachably mounted on the tube end. The centerlines of the two main spindle tubes are on the same straight line, and the rotational power sources of the two tube clamping power mechanisms are linked.

[0008] Preferably, any of the main spindle tubes has a cavity through which a thin-walled tube can pass.

[0009] Preferably, the axial dimension of the spindle tube cavity is smaller than the distance between the two tube ends.

[0010] Preferably, it includes a linkage power mechanism, which includes a linkage main shaft and a rotary power unit that is driven and connected to the linkage main shaft. The rotary power source is a synchronous transmission belt for driving the linkage main shaft and the main shaft tube.

[0011] Preferably, the power carrier includes two bearing carriers spaced apart from each other, and each bearing carrier is provided with a mating bearing that is movably connected to the main spindle tube.

[0012] Preferably, the bearing frame on the side of the power frame away from the electrolysis chamber is provided with an axial limiting flange for axially limiting the main shaft tube, and the axial limiting flange is provided with a detachable tube sealing part for sealing the tube cavity.

[0013] Preferably, the brush mechanism includes a rotating carrier with rotational displacement disposed on the power carrier, the rotating carrier having two pivot clamping arms for relative clamping of the spindle tube, and an elastic element for elastically stretching and forcing the pivot clamping arm to abut against the spindle tube between any of the pivot clamping arms and the rotating carrier.

[0014] Preferably, the free end of any of the pivot clamping arms is provided with a conductive block having pivot displacement, and the conductive block is provided with a conforming arc surface wall that matches the outer peripheral wall of the spindle tube.

[0015] The present invention also proposes a bidirectional clamping method for tubes, based on the aforementioned electrolytic turning apparatus for thin-walled tubes, wherein any of the spindle tubes is provided with a cavity for the thin-walled tubes to pass through; When clamping thin-walled pipes, clamping should be performed according to the axial dimensions of the thin-walled pipes: When the axial dimension of the thin-walled tube is less than or equal to the gap between the two tube ends, the two tapered clamps are fitted onto the thin-walled tube, the thin-walled tube is loaded between the two tube ends, and the free end of the thin-walled tube is clamped by screwing the tapered clamps between the tube ends and the tube ends. When the axial dimension of the thin-walled tube is greater than the gap between the two tube ends, the thin-walled tube is threaded through the exposed end of the main tube cavity and pushed out of the tube end. Two tapered chucks are fitted onto the thin-walled tube, and the two ends of the thin-walled tube are adjusted to enter the tube cavity respectively. The thin-walled tube is then screwed and locked with the tube end by the tapered chucks.

[0016] The beneficial effects of this invention are mainly reflected in: 1. The structure of bidirectional clamping and locking synchronous linkage rotation drive for thin-walled tubes ensures the accuracy of rotational displacement of thin-walled tubes, stabilizes constant gap control, and significantly improves the machining accuracy of electrolytic turning.

[0017] 2. The spindle tube design with a cavity can meet the loading requirements of thin-walled tubes with different axial specifications, and the bidirectional clamping operation is also relatively simple and convenient.

[0018] 3. It can achieve stable contact with the spindle tube brush, ensuring the conductive contact area and conductivity stability, and maintaining the operational reliability of electrolytic turning. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of an electrolytic turning apparatus for thin-walled tubes according to the present invention.

[0020] Figure 2 This is a side view of the electrolytic turning apparatus for thin-walled tubes according to the present invention.

[0021] Figure 3 This is a top view schematic diagram of the electrolytic turning device for thin-walled tubes according to the present invention.

[0022] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure of AA.

[0023] Figure 5 This is a schematic diagram of the pipe clamping power mechanism in a thin-walled pipe electrolytic turning processing device of the present invention.

[0024] Figure 6 This is a schematic diagram of the clamping process in Embodiment 1 of the bidirectional clamping method for pipes according to the present invention.

[0025] Figure 7 This is a schematic diagram of the clamping process in Embodiment 2 of the present invention, which describes a bidirectional clamping method for pipes. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0028] This invention provides an electrolytic turning apparatus for thin-walled tubes, such as... Figures 1 to 5 As shown, it includes an electrolysis chamber 1, and a set of opposite sidewalls of the electrolysis chamber 1 are respectively provided with a pipe clamping power mechanism 2.

[0029] The tube clamping power mechanism 2 includes a power carrier 3, a main spindle tube 4 with free rotational displacement mounted on the power carrier 3, and a brush mechanism 5 in conductive contact with the main spindle tube 4. The main spindle tube 4 has a rotational power source 6 and a tube end 41 extending through the side wall into the electrolysis chamber. A tapered chuck 7 for clamping thin-walled tubes is detachably mounted on the tube end 41.

[0030] The centerlines of the two main spindle tubes 4 are on the same straight line, and the rotational power sources of the two tube clamping power mechanisms 2 are linked.

[0031] Detailed implementation process and principle explanation: The electrolysis chamber 1 serves as an electrolysis space to receive the electrolyte sprayed and dropped by the electrolysis cutter. The thin-walled tube 200 is bidirectionally clamped and fixed on two tube clamping power mechanisms 2. The thin-walled tube is locked on the main spindle tube 4 by the tapered chuck 7. The rotation of the main spindle tube 4 drives the thin-walled tube to rotate synchronously in both directions.

[0032] The two rotating power sources can be linked mechanically or by controller, as long as they can achieve synchronous linkage between the two spindle tubes 4, which is within the scope of protection of this case.

[0033] In this case, the two spindle tubes 4 synchronously drive the thin-walled tube to rotate, effectively maintaining their coaxiality, reducing runout deviation during rotation, ensuring a constant and reliable gap, and guaranteeing the precision of electrolytic turning. Meanwhile, the brush mechanism 5 acts on the spindle tubes 4 to maintain relatively reliable conductivity stability.

[0034] The tapered tube chuck 7 is described below. The tapered tube chuck 7 can adopt the matching structure of ER chuck and tapered sleeve nut, which is the prior art. The appropriate chuck is selected according to the outer diameter of the thin-walled tube. As long as the device that meets the requirement of the spiral generating circumferential clamping is within the protection scope of this case.

[0035] It should be noted that this electrolytic turning is a non-contact relative fit, so the clamping force requirement is low. Generally, the stability can be maintained by tightening the tapered chuck, and it will not cause large clamping deformation to the outer peripheral wall.

[0036] In one specific embodiment, a support base plate 10 is provided, on which the electrolysis chamber 1, the pipe clamping power mechanism 2, and the rotation power source are all mounted. The support base plate 10 has an alignment reference 100 for axial alignment of the two pipe clamping power mechanisms 2. This alignment reference 100 is generally mechanically positioned using positioning blocks, and calibration via X-rays is required during debugging. Structures that satisfy the axial alignment constraints of the two pipe clamping power mechanisms 2 are all within the protection scope of this application.

[0037] In one specific embodiment, such as Figure 2 , Figure 7 As shown, any spindle tube has a cavity 42 for thin-walled tubing to pass through.

[0038] Specifically, when the axial dimension of the thin-walled tube is greater than the distance between the two tube ends, the thin-walled tube is threaded and fed through the cavity 42. This adapts to thin-walled tubes of various axial specifications and also meets the requirements of segmented processing. The thin-walled tube has sufficient free space for rotation within the cavity 42.

[0039] In one specific embodiment, the axial dimension of the spindle tube 4 is smaller than the distance between the two tube ends. This satisfies... Figure 6 and Figure 7 To meet the loading requirements, when threading and connecting pipes, ensure that the thin-walled pipes have exposed ends for easy handling and position adjustment. Of course, auxiliary tools can also be used for loading. This embodiment is designed to load and adjust the position of the material without the need for additional tools.

[0040] In one specific embodiment, such as Figures 1 to 3As shown, it includes a linkage power mechanism 8, which includes a linkage main shaft 81 and a rotary power unit 82 that is driven and connected to the linkage main shaft. The rotary power source 6 is a synchronous transmission belt used for the linkage main shaft and the main shaft tube to drive each other.

[0041] This embodiment is a specific linkage drive structure, which uses a rotary power unit 82 to drive the linkage spindle 81, and the linkage spindle 81 drives the spindle tube 4 to rotate synchronously through two synchronous transmission belts.

[0042] It should be noted that the rotating power unit 82 can be driven by a ring motor, or by a rotary motor for gear transmission, or a speed reduction gearbox can be set at the motor output end for speed ratio optimization. As long as the structure that can synchronously drive the two main spindle tubes 4 is within the protection scope of this case.

[0043] In one specific embodiment, the power carrier 3 includes two bearing carriers 31 arranged at intervals, and each bearing carrier is provided with a mating bearing 32 that is movably connected to the main spindle tube.

[0044] It is sufficient to allow free rotation and mating of the spindle tube 4.

[0045] In one specific embodiment, the bearing frame on the side of the power carrier 3 away from the electrolysis chamber is provided with an axial limiting flange 33 for axially limiting the main shaft tube, and the axial limiting flange is provided with a detachable tube sealing part for sealing the tube cavity.

[0046] The diagram and markings of the cavity sealing section are omitted in the attached figure. The axial limiting flange 33 serves to meet the axial safety limiting requirements of the main shaft tube 4. The cavity sealing section is generally used for electrolyte isolation. Under normal circumstances, the electrolyte level in the electrolysis chamber 1 is low and needs to be discharged in time. The cavity sealing section can block the cavity and effectively prevent possible electrolyte overflow and discharge. It is a safety design and is not used under normal circumstances, only applicable to extreme situations.

[0047] In one specific embodiment, such as Figure 5 As shown, the brush mechanism 5 includes a rotating carrier 51 with rotational displacement mounted on a power carrier. The rotating carrier is provided with two pivot clamping arms 52 for relative clamping of the spindle tube. An elastic element 53 is provided between any pivot clamping arm and the rotating carrier for elastically stretching to force the pivot clamping arm to abut against the spindle tube.

[0048] This design ensures the stability of the brush contact.

[0049] In one specific embodiment, the free end of any pivot clamping arm 52 is provided with a conductive block 520 having pivot displacement, and the conductive block is provided with a conforming arc surface wall that matches the outer peripheral wall of the spindle tube.

[0050] This ensures the area of ​​the conductive bonding surface, guaranteeing conductivity and stability.

[0051] The present invention provides a specific description of a bidirectional clamping method for pipes. When clamping thin-walled pipes, the clamping is performed according to the axial dimension of the thin-walled pipes.

[0052] like Figure 6 As shown, when the axial dimension of the thin-walled tube 200 is less than or equal to the gap between the two tube ends, two tapered clamps are fitted onto the thin-walled tube, the thin-walled tube is loaded between the two tube ends, and the free end of the thin-walled tube is clamped by screwing the tapered clamps between the tube ends and the tube ends.

[0053] The clamp and the tapered sleeve are then fitted onto the thin-walled pipe 200. The pipe is then aligned with its two ends, and the clamp is embedded in the pipe end. The tapered sleeve is then tightened by screwing to secure the clamp to the pipe.

[0054] like Figure 7 As shown, when the axial dimension of the thin-walled tube is greater than the gap between the two tube ends, the thin-walled tube is threaded through the exposed end of the main tube's cavity, and then pushed out of the tube end. Two tapered clamps are fitted onto the thin-walled tube, and the two ends of the thin-walled tube are adjusted to extend into the cavity respectively. The thin-walled tube is then screwed and locked to the tube end using the tapered clamps. This method is suitable for mounting thin-walled tubes of various specifications with different axial dimensions.

[0055] There are multiple ways to perform this bidirectional clamping. Generally, the tapered chuck on the other side can be pre-installed, requiring only one tapered chuck to be fitted. Alternatively, the tapered chuck can be designed with a guide cone wall that matches the tube cavity, allowing thin-walled tubes to be directly pushed through the tapered chuck, making the operation more convenient and efficient.

[0056] As described above, the structure employing bidirectional clamping, locking, and synchronously driven rotation for thin-walled tubing ensures precise rotational displacement, maintains stable constant clearance control, and significantly improves the accuracy of electrolytic turning. The spindle tube design with a cavity meets the loading requirements of thin-walled tubing with varying axial dimensions, and the bidirectional clamping operation is simple and convenient. Stable brush contact with the spindle tube is achieved, ensuring adequate conductive contact area and conductivity stability, thus maintaining the reliability of electrolytic turning operations.

[0057] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0058] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A thin-walled pipe electrolytic turning device, characterized in that: it comprises an electrolytic cabin, and the outer side of a set of opposite side walls of the electrolytic cabin is respectively provided with a pipe clamping power mechanism; the pipe clamping power mechanism comprises a power carrier, a main shaft pipe provided on the power carrier and having a rotary free displacement, and a brush mechanism in conductive contact with the main shaft pipe; the main shaft pipe is provided with a rotary power source; the main shaft pipe is provided with a pipe end extending through the side wall into the electrolytic cabin; and a taper cylinder chuck for clamping a thin-walled pipe is detachably arranged on the pipe end; the axial lines of the two main shaft pipes are located on the same straight line, and the rotary power sources of the two pipe clamping power mechanisms are linked.

2. The thin-walled pipe electrolytic turning device according to claim 1, characterized in that: any of the main shaft pipes is provided with a pipe cavity for the thin-walled pipe to pass through.

3. The thin-walled pipe electrolytic turning device according to claim 1, characterized in that: the axial size of the pipe cavity of the main shaft pipe is smaller than the spacing between the two pipe ends.

4. The thin-walled pipe electrolytic turning device according to claim 1, characterized in that: it comprises a linkage power mechanism, the linkage power mechanism comprises a linkage main shaft and a rotary power part in driving connection with the linkage main shaft; and the rotary power source is a synchronous transmission belt for transmission connection between the linkage main shaft and the main shaft pipe.

5. The thin-walled pipe electrolytic turning device according to claim 3, characterized in that: the power carrier comprises two bearing carriers arranged at intervals, and any of the bearing carriers is provided with a matching bearing in active matching with the main shaft pipe.

6. The thin-walled pipe electrolytic turning device according to claim 5, characterized in that: the bearing carrier on the side of the power carrier away from the electrolytic cabin is provided with an axial limiting flange for axially limiting the main shaft pipe; and the axial limiting flange is provided with a pipe cavity sealing part for sealing the pipe cavity and arranged detachably.

7. The thin-walled pipe electrolytic turning device according to claim 1, characterized in that: the brush mechanism comprises a rotary carrier provided on the power carrier and having a rotary displacement; the rotary carrier is provided with two pivot clamping arms for relatively clamping the main shaft pipe; and any of the pivot clamping arms is provided with an elastic element between the pivot clamping arm and the rotary carrier for elastically stretching and forcing the pivot clamping arm to abut against the main shaft pipe.

8. The thin-walled pipe electrolytic turning device according to claim 7, characterized in that: the free end of any of the pivot clamping arms is provided with an electrically conductive block having a pivot displacement; and the electrically conductive block is provided with a matching curved surface wall matched with the outer peripheral wall of the main shaft pipe.

9. A pipe two-way clamping method based on the thin-walled pipe electrolytic turning device according to any one of claims 1-8, characterized in that: any of the main shaft pipes is provided with a pipe cavity for the thin-walled pipe to pass through; when clamping the thin-walled pipe, the clamping is performed according to the axial size of the thin-walled pipe: ​ ​ ​ ​ ​ ​ ​ ​ ​ When the axial dimension of the thin-walled pipe is less than or equal to the gap between the two pipe ends, the two taper sleeve collets are sleeved on the thin-walled pipe, the thin-walled pipe is loaded between the two pipe ends, and the free end of the thin-walled pipe is clamped by screwing the taper sleeve collet and the pipe end; When the axial dimension of the thin-walled pipe is greater than the gap between the two pipe ends, the thin-walled pipe is inserted along the exposed end of the lumen of the main shaft pipe, and the thin-walled pipe is ejected from the pipe end, two taper sleeve collets are sleeved on the thin-walled pipe, the two ends of the thin-walled pipe are adjusted to penetrate into the lumen, and the thin-walled pipe is locked by screwing the taper sleeve collet and the pipe end.

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