Radial vibration-assisted electrochemical machining method and device for micro-texturing the inner wall of a rotating body of a thin-walled part

Abstract

A method for radial vibration-assisted electrolytic machining of the inner wall of a thin-walled rotating body with micro-texture, wherein a tool cathode with a micro-convex texture on the surface that can perform radial vibration is connected to the negative electrode of a power source, the tool cathode is connected to an ultrasonic current generator, and the thin-walled rotating body workpiece is connected to the positive electrode of the power source, and the columnar electrodes on the tool cathode are arranged in a linear array; the electrolyte enters the reaction area between the tool cathode and the workpiece through a liquid supply pipe; the machine tool spindle drives the tool cathode to translate along the circumferential direction according to a preset trajectory, maintaining a certain machining gap between the workpiece and the columnar electrodes on the tool cathode, and the machine tool spindle drives the tool cathode to rotate, and the tool cathode connected to the ultrasonic current generator constructs an ultrasonic energy field; the electrolyte flowing out at a high speed is sprayed onto the workpiece to obtain the desired machining morphology. A device for radial vibration-assisted electrolytic machining of the inner wall of a thin-walled rotating body with micro-texture is provided. The present invention improves the localization, stability, precision and efficiency of the machining of the inner wall of the rotating body.

Description

Technical Field

[0001] The invention belongs to the field of low-voltage, high-electrolyte flow rate jet radial ultrasonic energy field assisted electrolytic machining, and in particular relates to a method and device for radial vibration assisted electrolytic machining of micro-texture on the inner wall of a rotating body of a thin-walled part. Background Art

[0002] Microstructures are widely used in aviation, aerospace, automobile, electronics, molds, chemical fiber and other fields to improve product performance. The main methods of surface processing microtexture are mechanical processing, photolithography, electrospark machining, laser processing and electrolytic processing. Mechanical processing and photolithography have low processing efficiency, long process and high condition requirements; electrospark machining (EDM) is difficult, demanding and costly; laser processing technology is non-contact processing with fast processing speed and high efficiency; ultrasonic assisted electrolytic processing removes materials in the form of ions with the assistance of ultrasonic energy field, which can achieve high processing efficiency and theoretically high processing accuracy. Electrolytic processing can process microstructures based on simple-shaped microelectrodes, and the surface performance of the workpiece after processing is good. It plays a unique advantage in micro-machining, especially in the microstructure processing of the inner wall of the rotating body. However, in the processing of thin-walled rotating body wall microtexture, there are problems such as difficulty in discharging processed products and low processing performance, so it is necessary to find a reasonable and efficient processing method. Summary of the invention

[0003] In order to overcome the shortcomings of existing processing methods for micro-texturing the inner wall of a thin-walled rotating body, such as difficulty in discharging processed products and low processing performance, the present invention provides a radial vibration-assisted electrolytic processing method and device for micro-texturing the inner wall of a wall part rotating body, which improves the localization, stability, precision and efficiency of micro-texturing processing on the inner wall of a rotating body.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A method for radial vibration-assisted electrolytic machining of micro-textured inner wall of a rotating body of a thin-walled workpiece comprises the following steps: connecting a tool cathode having a micro-convex platform texture on its surface and capable of radial vibration to the negative electrode of a power source, connecting the tool cathode to an ultrasonic current generator, connecting a thin-walled rotating body workpiece to the positive electrode of the power source, and disposing columnar electrodes on the tool cathode in a linear array; an electrolyte enters a reaction region between the tool cathode and the workpiece via a liquid supply pipe, and participates in an electrochemical reaction between the tool cathode and the workpiece; a machine tool spindle drives the tool cathode to translate in a circumferential direction according to a preset trajectory, and maintains a certain machining gap between the workpiece and the columnar electrodes on the tool cathode. At the same time, the machine tool spindle drives the tool cathode to rotate, and the tool cathode connected to the ultrasonic current generator constructs an ultrasonic energy field; the electrolyte flowing out at a high speed is sprayed onto the workpiece, and machining of the micro-textured inner wall of the rotating body is realized, and a desired machining morphology is obtained.

[0006] Furthermore, the turntable for clamping the workpiece also performs rotational motion along a set trajectory.

[0007] A device for radial vibration-assisted electrolytic machining of the inner wall of a rotating body of a thin-walled part with micro-texture, comprising a tool cathode and a workpiece clamping and rotating device, wherein the tool cathode is composed of three parts in total, the first part is a stainless steel metal sheet with a columnar electrode; the second part is a cylindrical piezoelectric ceramic; the third part is a stainless steel rod, one end of which is provided with a cylindrical piezoelectric ceramic; the stainless steel metal sheets are connected by screws and combined with the stainless steel rod to form a rod-shaped tool cathode; the workpiece clamping and rotating device comprises a turntable and a workpiece clamping unit, and the workpiece clamping units are evenly installed on the turntable in a circumferential direction.

[0008] Furthermore, the cylindrical piezoelectric ceramic and the stainless steel metal sheet are respectively connected to two ends of the ultrasonic current generator.

[0009] Furthermore, T-shaped grooves are evenly distributed on the turntable along the circumferential direction for installing a workpiece clamping unit.

[0010] Furthermore, the workpiece clamping unit includes a pressure block, a hexagonal bolt, a hexagonal nut and a gasket. The pressure block has a through hole located above the T-slot of the turntable. The width of the pressure block is greater than the width of the T-slot. The hexagonal bolt first inserts the bolt head into the T-slot of the turntable, and the through hole of the pressure block cooperates with the hexagonal bolt. The hexagonal nut and the gasket then cooperate with the hexagonal bolt to achieve the clamping of the workpiece.

[0011] Preferably, the height of the pressing block is smaller than the height of the workpiece.

[0012] The number of the T-slots on the turntable and the workpiece clamping units is 3.

[0013] The beneficial effects of the present invention are mainly manifested in:

[0014] 1. The tool cathode can combine the ultrasonic energy field on the basis of realizing group structure processing, has a simple structure, a short preparation cycle and strong pertinence.

[0015] 2. The turntable for clamping the tool can effectively cooperate with the tool cathode, the device structure is simple and easy to disassemble.

[0016] 3. The device can realize the rotational motion and circular motion of the tool cathode, and can also realize the rotational motion of the workpiece, which can effectively improve the processing efficiency of the micro-texture of the inner wall of the cylinder. The continuously rotating tool cathode can not only take away the electrolyte, but also reduce stray corrosion and improve the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a structural schematic diagram of a radial vibration-assisted electrochemical machining device for micro-texturing the inner wall of a rotating body of a thin-walled part.

[0018] Figure 2 It is a processing schematic diagram of the device.

[0019] Figure 3 It is a schematic diagram of the structure of the tool cathode.

[0020] Figure 4 It is the tool cathode motion trajectory diagram. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Reference Figure 1 to Figure 4 A radial vibration-assisted electrolytic machining method for micro-textured inner wall of a thin-walled rotating body, wherein a tool cathode having a micro-convex platform texture on the surface and capable of radial vibration is connected to the negative electrode of a power source, the tool cathode is connected to an ultrasonic current generator, the thin-walled rotating body workpiece is connected to the positive electrode of the power source, and the columnar electrodes on the tool cathode are arranged in a linear array; the electrolyte enters the reaction area between the tool cathode and the workpiece through a liquid supply pipe, and participates in the electrochemical reaction between the tool cathode and the workpiece; the machine tool spindle drives the tool cathode to translate in a circumferential direction according to a preset trajectory, maintaining a certain machining gap between the workpiece and the columnar electrodes on the tool cathode, and at the same time, the machine tool spindle drives the tool cathode to rotate, and the tool cathode connected to the ultrasonic current generator constructs an ultrasonic energy field; the high-speed outflowing electrolyte is sprayed onto the workpiece to realize the machining of the micro-textured inner wall of the rotating body and obtain the desired machining morphology.

[0023] A device for radial vibration-assisted electrolytic machining of the inner wall of a rotating body of a thin-walled part includes a tool cathode and a workpiece clamping and rotating device. The tool cathode 10 is composed of three parts in total. The first part is a stainless steel metal sheet 13 with a columnar electrode; the second part is a cylindrical piezoelectric ceramic 12; the third part is a stainless steel rod 14, one end of which is provided with the cylindrical piezoelectric ceramic 12, and the cylindrical piezoelectric ceramic 12 and the stainless steel metal sheet 13 are respectively connected to the two ends of the ultrasonic current generator. The stainless steel metal sheets are connected by screws and combined with the stainless steel rod to form a rod-shaped tool cathode.

[0024] The workpiece clamping and rotating device comprises a turntable 1 and a workpiece 7 clamping unit, and T-shaped slots 2 are evenly distributed along the circumferential direction on the turntable for installing the workpiece clamping unit;

[0025] The workpiece clamping unit includes a pressure block 6, a hexagonal bolt 3, a hexagonal nut 4 and a gasket 5. The pressure block has a through hole located above the T-slot 2 of the turntable, and its width is slightly larger than the width of the T-slot 2. The hexagonal bolt head 3 is first inserted into the T-slot 2 of the turntable, and the through hole of the pressure block 6 cooperates with the hexagonal bolt 3, and the hexagonal nut 4 and the gasket 5 cooperate with the hexagonal bolt 3 to achieve the clamping of the workpiece 7.

[0026] Furthermore, the height of the pressing block is slightly smaller than the height of the workpiece.

[0027] Furthermore, the number of the T-slots 2 on the turntable and the workpiece 7 clamping units is 3; of course, it can also be other numbers.

[0028] In this embodiment, the tool cathode is fixed by a three-jaw chuck of a machine tool, and the workpiece 7 is centrally positioned and fixed by three pressing blocks.

[0029] The device for radial vibration-assisted electrochemical machining of the inner wall micro-texture of a thin-walled rotating body is installed on the XY axis of a machine tool through a connecting nut, and feeds along with the XY axis of the machine tool to adjust the machining gap between the tool cathode and the workpiece, and preset the movement trajectory 15 of the tool cathode, thereby machining the inner wall micro-structure of a thin-walled rotating body.

[0030] The radial vibration-assisted electrolytic machining method for the micro-texture of the inner wall of a rotating thin-walled part of this embodiment is as follows: the tool cathode is connected to the negative electrode of the power supply, the workpiece is connected to the positive electrode of the power supply, and the electrolyte enters between the tool electrode and the workpiece through the liquid supply pipe 8 to participate in the electrochemical reaction. The rotation of the tool cathode will take away a part of the electrolyte to achieve drainage; the excess electrolyte flows out of the reaction zone from the turntable under the action of gravity and enters the electrolyte tank 11. The machine tool spindle drives the tool cathode to perform circular motion according to the preset trajectory 15, and maintains a certain machining gap between the workpiece and the columnar electrode on the tool cathode to achieve the machining of the inner wall micro-texture and obtain the desired machining morphology.

[0031] The present invention adopts a radial vibration-assisted electrolytic machining device for the micro-texture of the inner wall of a rotating body of a thin-walled part to perform jet electrolytic machining. The rotation of the tool cathode is combined with circular motion, workpiece rotation and other motions to achieve high-efficiency, high-stability and high-precision machining of the microstructure of the inner wall of the rotating body of the thin-walled part; thus, micro-machining is more convenient and efficient.

Claims

1. A method for radial vibration-assisted electrochemical machining of micro-textures on the inner wall of a rotating body of a thin-walled part. It is characterized in that The processing device includes a tool cathode and a workpiece clamping and rotating device, wherein the tool cathode is composed of three parts in total, the first part is a stainless steel metal sheet with a columnar electrode; the second part is a cylindrical piezoelectric ceramic; the third part is a stainless steel rod, one end of which is provided with a cylindrical piezoelectric ceramic; the stainless steel metal sheets are connected by screws and combined with the stainless steel rod to form a rod-shaped tool cathode; the workpiece clamping and rotating device includes a turntable and a workpiece clamping unit, the workpiece clamping units are evenly installed on the turntable in the circumferential direction, the tool cathode with a micro-convex platform texture on the surface that can vibrate radially is connected to the negative pole of the power supply, and the tool cathode is connected to the ultra The acoustic current generator and the thin-walled rotating workpiece are connected to the positive pole of the power supply, and the columnar electrodes on the tool cathode are arranged in a linear array; the electrolyte enters the reaction area between the tool cathode and the workpiece through the liquid supply tube, and participates in the electrochemical reaction between the tool cathode and the workpiece; the machine tool spindle drives the tool cathode to move in a circular direction according to a preset trajectory, maintaining a certain processing gap between the workpiece and the columnar electrode on the tool cathode. At the same time, the machine tool spindle drives the tool cathode to rotate, and the tool cathode connected to the ultrasonic current generator constructs an ultrasonic energy field; the high-speed outflowing electrolyte is sprayed onto the workpiece to realize the processing of the micro-texture of the inner wall of the rotating body and obtain the required processing morphology.

2. A method for radial vibration-assisted electrochemical machining of micro-texture on the inner wall of a rotating body of a thin-walled part as claimed in claim 1, It is characterized in that The turntable for clamping the workpiece also rotates along the set trajectory.

3. The method for radial vibration-assisted electrochemical machining of micro-texture on the inner wall of a rotating body of a thin-walled part according to claim 1, It is characterized in that The cylindrical piezoelectric ceramic and the stainless steel metal sheet are respectively connected to two ends of the ultrasonic current generator.

4. The method for radial vibration-assisted electrochemical machining of micro-texture on the inner wall of a rotating body of a thin-walled part according to claim 1 or 3, It is characterized in that The turntable is provided with T-shaped grooves evenly distributed along the circumferential direction for installing the workpiece clamping unit.

5. The method for radial vibration-assisted electrochemical machining of micro-texture on the inner wall of a rotating body of a thin-walled part according to claim 4, It is characterized in that The workpiece clamping unit includes a pressure block, a hexagonal bolt, a hexagonal nut and a gasket. The pressure block has a through hole located above the T-slot of the turntable. The width of the pressure block is greater than the width of the T-slot. The hexagonal bolt first inserts the bolt head into the T-slot of the turntable, and the through hole of the pressure block cooperates with the hexagonal bolt. The hexagonal nut and the gasket then cooperate with the hexagonal bolt to achieve the clamping of the workpiece.

6. The method for radial vibration-assisted electrochemical machining of micro-texture on the inner wall of a rotating body of a thin-walled part according to claim 5, It is characterized in that The height of the pressing block is smaller than the height of the workpiece.

7. The method for radial vibration-assisted electrochemical machining of micro-texture on the inner wall of a rotating body of a thin-walled part according to claim 4, It is characterized in that The number of the T-slots on the turntable and the workpiece clamping units is 3.

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