A device for realizing low-frequency vibration feeding of cathode in electrolytic machining

Abstract

The invention discloses a cathode low-frequency vibration feeding device for realizing electrolytic machining, including a constant speed feeding device, a power output device installed on the constant speed feeding device, a vibration generating device, a rotary filtering device, and a reset device; the power output device is used to provide power output for the vibration generating device; the vibration generating device includes a curved surface bearing, a rotor and a stator connected to the curved surface bearing, and a power output end; when the power output device outputs power, the curved surface bearing rotates, and the curved surface bearing drives the rotor to perform circumferential rotational motion and axial reciprocating low-frequency vibration; the rotary filtering device is a bearing, the inner side of the bearing is connected to the rotor, and the outer side of the bearing is connected to the power output end; the bearing is used to filter the rotational motion of the front rotor and drive the power output end to perform axial reciprocating low-frequency vibration; the reset device is connected to the rotary filtering device, and is used to complete the reset of the axial motion of the vibration generating device. The present invention can improve the flow field in a small machining gap and accelerate the renewal of the electrolyte.

Description

Technical Field

[0001] The invention relates to the field of electrolytic machining, and in particular to a cathode low-frequency vibration feeding device for electrolytic machining. Background Art

[0002] In recent years, with the rapid development of the aerospace industry, a large number of aviation manufacturing problems have emerged and need to be solved urgently. In the field of aviation manufacturing, especially for conductive and difficult-to-process materials such as high-temperature resistant alloys and martensitic stainless steel, precision electrolytic machining is widely used because it has the advantages of low cost, high efficiency, high forming accuracy, good surface quality, and one-time processing of complex surfaces compared to traditional mechanical machining.

[0003] Vibration-assisted electrolysis is an important measure to improve the accuracy of electrolytic machining. Through a vibration generating device, a periodic vibration parallel to the feed direction is compounded while the cathode makes a unidirectional feed motion, which produces a suction effect on the electrolyte in the machining gap, thereby improving the flow field conditions, accelerating the renewal of the electrolyte in the gap, and facilitating the timely removal of electrolytic products and heat.

[0004] Since the development of precision electrolytic machining technology, scholars have proposed a variety of methods to achieve cathode vibration feeding, which can be basically divided into three categories according to the working principle: mechanical vibration, electromagnetic vibration, and electro-hydraulic vibration. However, most of them still have defects such as difficulty in amplitude adjustment and large device size.

[0005] For example, patent CN201510195635.6 proposes an electromagnetically driven low-frequency vibration electrolytic device. Since the electromagnetically driven vibration device is greatly affected by the external load, it is difficult to achieve stable low-frequency vibration of the tool cathode under alternating load conditions. Therefore, it is urgent to develop a processing device that can achieve low-frequency vibration feeding of the cathode in electrolytic machining, and the amplitude and vibration frequency are easy to adjust within a certain range, which is of great significance to the development of precision electrolytic machining technology. Summary of the invention

[0006] Purpose of the invention: The present invention provides a cathode low-frequency vibration feeding device for electrolytic machining, which can improve the flow field in a small machining gap, accelerate the renewal of the electrolyte, take away the electrolytic products and heat, and improve the accuracy and stability of electrolytic machining.

[0007] Technical solution: The present invention discloses a cathode low-frequency vibration feeding device for electrolytic machining, which specifically includes: a constant speed feeding device, a low-frequency vibration device installed on the constant speed feeding device; the low-frequency vibration device includes a power output device, a vibration generating device, a rotary filtering device, and a reset device;

[0008] The power output device is connected to the vibration generating device and is used to provide power output for the vibration generating device;

[0009] The vibration generating device comprises a curved surface bearing, a front end rotor connected to the curved surface bearing, a stator connected to the curved surface bearing, and a power output end; when the power output device outputs power, the curved surface bearing rotates, and the curved surface bearing drives the front end rotor to perform circumferential rotation and axial reciprocating low-frequency vibration;

[0010] The rotary filter device is a bearing capable of bearing axial dynamic loads, the inner side of the bearing is connected to the front rotor, and the outer side of the bearing is connected to the power output end; the bearing is used to filter the rotary motion of the front rotor and drive the power output end to perform axial reciprocating low-frequency vibration;

[0011] The resetting device is connected to the rotary filtering device and is used to complete the resetting of the axial movement of the vibration generating device.

[0012] Furthermore, the curved surface bearing includes a first raceway, a second raceway, and a roller; the first raceway is connected to the front end rotor, the second raceway is connected to the stator, and the roller is located between the first raceway and the second raceway; the first raceway and / or the second raceway are annular raceways and the surface of the annular raceway is a continuously undulating curved surface shape; the phase difference between the relative positions of the first raceway and the second raceway is adjustable.

[0013] Furthermore, the reset device includes a baffle and a spring; the constant speed feeding device includes a bearing platform; the baffle installed on the bearing platform is provided with a through hole for sliding of the power output end, one end of the spring is fixedly connected to the baffle, and the other end is fixedly connected to the outside of the bearing; a sliding track is provided on the bearing platform, and the bottom of the outer side of the bearing is fixedly connected to the sliding track.

[0014] Furthermore, the number of rollers of the curved surface bearing is at least three.

[0015] Furthermore, the curved surface shape of the curved surface bearing is a periodically changing curve, and a common periodically changing curve is a sine curve.

[0016] Furthermore, the rotary filtering device uses a thrust bearing.

[0017] Beneficial effects: Compared with the prior art, the cathode low-frequency vibration feeding device for electrolytic machining described in the present invention has the following significant advantages: by setting a curved bearing and a rotary filter device, the power output end can achieve stable axial reciprocating low-frequency vibration, and the device has a compact structure and a small size; by setting a hyperbolic raceway and adjusting the phase angle between the hyperbolic raceways, the amplitude can be adjusted steplessly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure shows a simplified schematic diagram of the structure of the device for realizing low-frequency vibration feeding motion according to the present invention;

[0019] Figure 2FIG. 1 is a schematic structural diagram of a low-frequency vibration device in the device for realizing low-frequency vibration feeding motion according to the present invention;

[0020] Figure 3 It is an exploded schematic diagram of a low-frequency vibration device in the device for realizing low-frequency vibration feeding motion according to the present invention;

[0021] Figure 4 Shown is a diagram showing the working principle of the curved surface bearing of the present invention; Figure 4 (a) shows that the single-side raceway is a curved surface structure; Figure 4 (b) shows that the double-sided raceways are curved structures;

[0022] Figure 5 It is a schematic diagram of the constant speed feeding motion device, the low frequency vibration device and the composite motion of the two according to the present invention; Figure 5 (a) shows the displacement-time relationship diagram of low-frequency vibration; 5 (b) shows the displacement-time relationship diagram of constant-speed feed motion; 5 (c) shows the schematic diagram of the composite feed motion of low-frequency vibration and constant-speed feed motion;

[0023] Figure 6 The figure shows a schematic diagram of the vibration principle of the curved bearing of the present invention when achieving zero amplitude; Figure 6 (a) The second raceway rotates relative to the first raceway. ; Figure 6 (b) The second raceway rotates relative to the first raceway ; Figure 6 (c) The second raceway rotates relative to the first raceway ; Figure 6 (d) The second raceway rotates relative to the first raceway. ;

[0024] Figure 7 The figure shows a schematic diagram of the vibration principle of the curved bearing of the present invention when the maximum amplitude is achieved; Figure 7 (e) The second raceway rotates relative to the first raceway ; Figure 7 (f) is the rotation of the second raceway relative to the first raceway ; Figure 7 (g) is the rotation of the second raceway relative to the first raceway ; Figure 7 (h) is the rotation of the second raceway relative to the first raceway ;

[0025] Figure 8 The figure shows a schematic diagram of coupling low-frequency vibration and power supply in the present invention;

[0026] Fig. 9 Shown is a schematic diagram of the position of the cathode relative to the workpiece during the vibration process of the present invention. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0028] like Figure 1 As shown, the present invention provides a cathode low-frequency vibration feeding device for electrolytic machining, which specifically includes a constant speed feeding device 1 and a low-frequency vibration device 2 installed on the constant speed feeding device.

[0029] The constant speed feeding device 1 mainly includes a driving device, a transmission component, a guide component, and necessary fixing and connecting parts. Specifically, in this embodiment, the constant speed feeding device 1 includes a bearing platform 11 and a constant speed feeding driving device 12. The constant speed feeding driving device 12 is a linear motor or a screw guide rail, etc., which is used to realize the overall constant speed or variable speed feeding of the bearing platform 11. A sliding track 13 is also provided on the bearing platform 11.

[0030] The low-frequency vibration device 2 includes a power output device 3, a vibration generating device 4, a rotary filtering device 5, and a reset device 6, and realizes low-frequency vibration parallel to the feeding direction through the connection between the devices. Specifically,

[0031] The power output device 3 is connected to the vibration generating device 4 to provide power output for the vibration generating device 4; the power output device 3 can select a motor with a suitable speed adjustment range and a reduction mechanism with a suitable reduction ratio according to specific requirements for the vibration frequency.

[0032] The vibration generating device 4 is a vibration generating mechanism with a curved bearing as a core component. Figures 1 to 4 As shown, it specifically includes a curved surface bearing 41, a front end rotor 42, a stator 43, a power input end 44, and a power output end 45. The stator 43 is fixed on the supporting platform 11. One end of the power input end 44 is connected to the power output device 3, and the other end is connected to the curved surface bearing 41. The curved surface bearing 41 includes a first raceway 7, a second raceway 8, and a roller 46 located between the first raceway 7 and the second raceway 8; the first raceway 7 is connected to the front end rotor 42, and the second raceway 8 is connected to the stator 43. Among them, the number of rollers 46 is at least three, and the single-side raceway or the raceways on both sides of the roller 46 can be set to a curved surface shape according to actual needs. As shown Figure 4 As shown in (a), one side raceway of the roller 46, namely the first raceway 7, is an annular raceway and the surface of the annular raceway is a continuously undulating curved surface; Figure 4 As shown in (b), the raceways on both sides of the roller 46, namely the first raceway 7 and the second raceway 8, are both annular raceways and the surface of the annular raceways is a continuously undulating curved surface shape; the curved surface shape is determined by the specific requirements of the vibration electrochemical machining. In this embodiment, it is set to be a sine curve shape.

[0033] The rotary filter device 5 uses a bearing 51 (such as a thrust bearing, a tapered roller bearing, etc.) that bears a large axial dynamic load to filter out the rotary motion and only retain the required axial vibration. Figure 1 As shown, the inner side of the bearing 51 is connected to the front rotor 42 , the outer side of the bearing 51 is connected to the power output end 45 , and the bottom is fixedly connected to the sliding track 13 .

[0034] The reset device 6 specifically includes a baffle 61 and a spring 62. The baffle 61 is mounted on one end of the bearing platform 11 and is provided with a through hole for the power output end 45 to slide. One end of the spring 62 is fixedly connected to the baffle 61, and the other end is fixedly connected to the outer side of the bearing 51.

[0035] Working process: When the power output device 3 provides power to the power input end 44, the power input end 44 drives the curved surface bearing 41. During the rotation of the curved surface bearing 41, the roller 46 moves in the raceway and drives

[0036] The front rotor 42 rotates. Since the raceway is set as a curved surface structure, the balls move along the curved surface, and the front rotor 42 generates a composite motion of rotational motion and axial reciprocating low-frequency vibration. The bearing 51 is used to eliminate the rotational motion generated by the front rotor 42. At the same time, the bearing 51 drives the power output end 45 to slide in the through hole of the baffle 61, and performs a composite motion of axial reciprocating low-frequency vibration. At the same time, the spring 62 assists the resetting process of the vibration generating device and plays a fixing role for the bearing used in the rotary filter unit. Figure 8 As shown, the flow field in the machining gap between the cathode and the workpiece is changed through the composite motion of axial reciprocating low-frequency vibration, thereby accelerating the renewal of the electrolyte.

[0037] By setting a single-sided curved raceway or a double-sided curved raceway to form a low-frequency vibration and adjust the vibration amplitude, the specific working principle is explained as follows:

[0038] according to Figure 5 (a) shows that the low-frequency vibration waveform is basically consistent with the rolling surface morphology of the curved bearing, so the amplitude and vibration frequency can be changed by replacing the bearing, and the speed and acceleration of the cathode at any position can be easily obtained through the waveform diagram, which is convenient for subsequent theoretical analysis. 5(b) shows the displacement-time relationship diagram of the constant speed feed motion, and 5(c) shows the schematic diagram of the composite feed motion of low-frequency vibration and constant speed feed motion.

[0039] according to Figure 6 and Figure 7 The principle of adjusting the low-frequency vibration amplitude is explained below. Taking the example of the first roller 7 generating two cycles of low-frequency vibration for each rotation, when two curved rollers are used, the vibration amplitude can be adjusted by adjusting the phase difference between the two curved rollers. Figure 6 The figure shows the relative position of the two bearings when the amplitude is zero, and the phase difference between the two curved raceways is 0; Figure 7 The figure shows the relative position of the two bearings when the amplitude is maximum, and the phase difference between the two curved raceways is п / 4.

[0040] Assuming that the two surfaces have exactly the same morphology, Figure 6 The first raceway 7 is fixed, and the second raceway 8 is Figure 6 (a) The relative position shown is rotated to Figure 6 (d) The relative position shown, where Figure 6 (a) to Figure 6 (d) The second roller 8 rotates , , , , to achieve a complete vibration cycle, although the circumferential relative position of the first raceway 7 and the second raceway 8 is changing, the axial relative position of the first raceway 7 and the second raceway 8 does not change, that is, the amplitude is zero.

[0041] Figure 7 The first raceway 7 is fixed, and the second raceway 8 is Figure 7 (e) The relative position shown is rotated to Figure 7 (h) The relative position shown, Figure 7 (e) to Figure 7 (h) The second roller 8 rotates , , , , achieving a complete vibration cycle. As the circumferential relative position of the first raceway 7 and the second raceway 8 changes, the axial relative position of the first raceway 7 and the second raceway 8 reaches a minimum value (f) and a maximum value (h).

[0042] In addition, an encoder is used to read the front rotor position of the low-frequency vibration device 2 in real time, so as to calculate the axial position of the tool cathode during the reciprocating vibration process according to the vibration curve. By reading the axial position of the cathode in real time, the low-frequency vibration process can be set to connect the electrolytic power supply at a fixed position close to the workpiece; and to disconnect the electrolytic power supply at a fixed position away from the workpiece, thereby realizing effective control of the power-on interval, that is, the conduction angle.

[0043] like Figure 8 and Fig. 9 As shown, the working process of low-frequency vibration-assisted electrochemical machining conduction angle linkage with the encoder is described in detail.

[0044] At the beginning of processing, the cathode is located relative to the workpiece At , the main console executes the machining program, turns on the power, turns on the servo motor, and the cathode begins to move away from the workpiece. At this moment, the cathode reaches the preset position At this point, the encoder feeds back the real-time position information of the motor to the main console, and the power supply executes the control command and then shuts down. Arrive at the preset position at any time At this point, the encoder feeds back the real-time position information of the motor to the main console, and the power supply is turned on immediately to execute the control command. This process is repeated until the processing program is completed.

[0045] When the processing is finished, the main console issues a processing stop control command, the power is disconnected, and the constant speed feed part motor stops quickly. The servo motor stops immediately after executing the preset reset program.

[0046] Location , The phase interval corresponding to the interval is the conduction angle, which can be changed by adjusting the power on and off positions according to specific needs. Purpose of the invention: The present invention provides a cathode low-frequency vibration feeding device for electrolytic machining, which can improve the flow field in a small machining gap, accelerate the renewal of the electrolyte, take away the electrolytic products and heat, and improve the accuracy and stability of electrolytic machining.

Claims

1. A cathode low-frequency vibration feeding device for electrolytic machining, characterized in that: include: A constant speed feeding device and a low frequency vibration device installed on the constant speed feeding device; the low frequency vibration device comprises a power output device, a vibration generating device, a rotary filtering device and a reset device; The power output device is connected to the vibration generating device and is used to provide power output for the vibration generating device; The vibration generating device comprises a curved surface bearing, a front end rotor connected to the curved surface bearing, a stator connected to the curved surface bearing, and a power output end; when the power output device outputs power, the curved surface bearing rotates, and the curved surface bearing drives the front end rotor to perform circumferential rotation and axial reciprocating low-frequency vibration; The rotary filter device is a bearing capable of bearing axial dynamic loads, the inner side of the bearing is connected to the front rotor, and the outer side of the bearing is connected to the power output end; the bearing is used to filter the rotary motion of the front rotor and drive the power output end to perform axial reciprocating low-frequency vibration; The resetting device is connected to the rotary filtering device and is used to complete the resetting of the axial movement of the vibration generating device; The curved surface bearing includes a first raceway, a second raceway, and a roller; the first raceway is connected to the front end rotor, the second raceway is connected to the stator, and the roller is located between the first raceway and the second raceway; the first raceway and / or the second raceway are annular raceways and the surface of the annular raceway is a continuously undulating curved surface shape; the phase difference between the relative positions of the first raceway and the second raceway is adjustable.

2. The cathode low-frequency vibration feeding device for electrolytic machining according to claim 1 is characterized in that: The reset device includes a baffle and a spring; the constant speed feeding device includes a bearing platform; the baffle installed on the bearing platform is provided with a through hole for the power output end to slide, one end of the spring is fixedly connected to the baffle, and the other end is fixedly connected to the outside of the bearing; a sliding track is provided on the bearing platform, and the bottom of the outer side of the bearing is fixedly connected to the sliding track.

3. The cathode low-frequency vibration feeding device for electrolytic machining according to claim 1 is characterized in that: The number of rollers in a curved bearing shall be at least three.

4. The cathode low-frequency vibration feeding device for electrolytic machining according to claim 1 is characterized in that: The curved surface shape of the curved bearing is a periodically changing curve.

5. The cathode low-frequency vibration feeding device for electrolytic machining according to claim 1 is characterized in that: The rotary filter device uses thrust bearings.

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