Device and method for pulsed current treatment of wire or sheet metal

Abstract

The present invention discloses a device and method for pulsed current treatment of metal wire materials and plates, relating to the technical field of electro-pulse metal processing, including: a first pressure assembly, at the bottom of which a first fixture is provided; a second pressure assembly, at the top of which a second fixture is provided, and a clamping area is defined between the first fixture and the second fixture, and the clamping area is adapted to the shape of the metal workpiece to be processed; the first pressure assembly and / or the second pressure assembly can drive the first fixture and the second fixture to approach each other. The clamping force of the fixture is evenly distributed on the surface of the metal workpiece to be processed, which can avoid metal bending and stretching caused under the condition of electrification. When currents are applied to the electrodes corresponding to the first fixture and the second fixture, the current density can be increased, providing a structural basis for the application of high-density current. It is beneficial to the uniform distribution of current on the surface of the metal workpiece to be processed, making the temperature inside the metal uniform.

Description

Technical Field

[0001] The present invention relates to the technical field of electro - pulse metal processing, and particularly to a device and method for processing pulsed current of metal wire or sheet. Background Art

[0002] Electro - plastic processing is to apply pulsed current to metal materials to make the metal extend and achieve the effect of plastic processing. Currently, it has been applied to enhance the processing technology of metals such as titanium alloys, aluminum alloys, magnesium alloys, and steel. The pulsed - current assisted processing technology is to pass high - frequency pulsed current through both ends of a metal wire or sheet to achieve electro - plastic processing by using the high - frequency pulsed current. The existing pulsed - current assisted processing technology has the following defects:

[0003] First, the power - on method generally uses conductive clamps to apply current to both ends of the metal. Due to the uneven distribution of the clamping force of the conductive clamps, the metal will generate traction forces along the axial and radial directions of the cross - section, thus causing the metal to bend and stretch when powered on.

[0004] Second, since the contact area between the conductive clamp and the metal is small, the current density passing through is small, and it is impossible to apply high - density current to the metal.

[0005] Third, due to the influence of the skin effect of pulsed current, the current distribution on the metal is uneven, resulting in an uneven distribution phenomenon of the temperature field inside the metal.

[0006] Fourth, the applicability of the existing pulsed - current power - on device is low. It cannot process multiple groups of wire materials with different wire diameters at the same time, nor can it be applied to wire materials and sheets at the same time.

[0007] In view of this, how to provide a pulsed - current processing device that can partially or fully solve the above - mentioned technical problems is an urgent problem for those skilled in the art. Summary of the Invention

[0008] The purpose of the present invention is to provide a device and method for processing pulsed current of metal wire or sheet to solve the problems existing in the prior art.

[0009] To achieve the above purpose, the present invention provides a device for processing pulsed current of metal wire or sheet, including:

[0010] A first pressure assembly, with a first clamp provided at its bottom;

[0011] A second pressure assembly, with a second clamp provided at its top. A clamping area is defined between the first clamp and the second clamp, and the clamping area is adapted to the shape of the metal workpiece to be processed;

[0012] The first pressure assembly can drive the first clamp and the second clamp to approach each other.

[0013] The first pressure assembly includes:

[0014] A first insulating member, the bottom of the first insulating member defining a first accommodation cavity; the first fixture is disposed in the first accommodation cavity, a first electrode plate is disposed on the upper surface of the first fixture, the first electrode plate is connected to the top wall of the first accommodation cavity through a spring, the first insulating member presses the first fixture from top to bottom through the spring, and drives the first fixture and the second fixture to approach each other;

[0015] A first limiting rod, sequentially penetrating through the first fixture, the first electrode plate, the spring and the first insulating member in the vertical direction, and the first electrode plate and the first fixture can move up and down along the first limiting rod.

[0016] Further, the second pressure assembly includes:

[0017] A second insulating member, the top of the second insulating member defining a second accommodation cavity; the second fixture is disposed in the second accommodation cavity, a second electrode plate is disposed on the lower surface of the second fixture;

[0018] A second limiting rod, sequentially penetrating through the second fixture, the second electrode plate and the second insulating member in the vertical direction;

[0019] The first fixture and the second fixture are made of a conductive material, the outer edges of the first insulating member and the second insulating member are in contact, the positions of the first accommodation cavity and the second accommodation cavity correspond to each other, and the positions of the first fixture and the second fixture correspond to each other.

[0020] Further, it further includes:

[0021] A first fixture fixing member, the bottom of which is recessed upward to form a first installation groove, the first insulating member is embedded in the first installation groove, the first limiting rod extends upward and is connected to the first fixture fixing member through a knurled nut;

[0022] A second fixture fixing member, the top of which is recessed downward to form a second installation groove, the second insulating member is embedded in the second installation groove, the second limiting rod extends downward and is connected to the second fixture fixing member;

[0023] The outer edges of the first fixture fixing member and the second fixture fixing member are in contact.

[0024] Further, it further includes a plurality of optical axes, the optical axes penetrate through the first fixture fixing member and the second fixture fixing member from top to bottom, and the first fixture fixing member or the second fixture fixing member can slide along the optical axes.

[0025] Further, it further includes:

[0026] A frame is provided with a lead screw. A lead screw nut is provided at the bottom of the second fixture fixing member, and the second fixture fixing member is threadedly connected to the lead screw through the lead screw nut;

[0027] A lead screw motor is in transmission connection with the lead screw and is used to drive the lead screw to rotate and drive the second fixture fixing member to move along the lead screw.

[0028] Furthermore, it further includes:

[0029] A pulse power supply is arranged below the frame and is used to supply power to the first electrode plate and the second electrode plate;

[0030] A monitoring module is arranged on the frame and is used to monitor the temperature of the metal workpiece to be processed.

[0031] The present invention also provides a method for pulsed current treatment of metal wire or sheet, applying the device for pulsed current treatment of metal wire or sheet, including the following steps:

[0032] S1: Confirm the shapes of the first fixture and the second fixture according to the shape of the metal workpiece to be processed, so that the clamping area is adapted to the shape of the metal workpiece to be processed;

[0033] S2: Confirm the clamping force between the first fixture and the second fixture according to the diameter or thickness of the metal workpiece to be processed and confirm the corresponding spring elasticity;

[0034] S3: Clamp the metal workpiece to be processed between the first fixture and the second fixture, lock the knurled nut and install the optical axis;

[0035] S4: Supply power to the first electrode plate and the second electrode plate, and apply pulsed current to the metal workpiece to be processed through the first fixture and the second fixture.

[0036] The present invention discloses the following technical effects:

[0037] I. A clamping area adapted to the shape of the metal workpiece to be processed is defined between the first fixture and the second fixture. Compared with the conductive clamps in the prior art, the contact area between the fixture and the metal workpiece to be processed can be greatly increased, which can bring the following effects:

[0038] 1. The clamping force of the fixture is evenly distributed on the surface of the metal workpiece to be processed, and metal bending and stretching caused by electrification can be avoided.

[0039] 2. When current is introduced into the electrode plates corresponding to the first fixture and the second fixture, the current density can be increased, providing a structural basis for the application of high-density current.

[0040] 3. It is beneficial to the uniform distribution of current on the surface of the metal workpiece to be processed, making the temperature inside the metal uniform.

[0041] 2. The clamping force between the first fixture and the second fixture is determined by the elastic force generated by spring compression. Therefore, springs with different parameters can be set according to different metal parts to be processed, ensuring that the fixture is in close contact with the metal part to be processed, the metal part to be processed is reasonably stressed, further avoiding lateral bending and stretching of the metal, achieving uniform lateral current distribution of the metal, and improving the uniformity of the distribution of the metal microstructure after processing.

[0042] 3. The first fixture and the second fixture are limited only by the limit rod and have no fixed connection relationship with the insulating parts, that is, they are arranged in the first insulating part and the second insulating part in a detachable manner. The required fixture model can be flexibly selected according to different metal parts to be processed, so that the equipment can be applied to both metal wire processing and metal sheet processing. In addition, the fixture fixing part on the outermost side of the equipment realizes the moving function through the lead screw, further expanding the application range of the equipment.

[0043] 4. By monitoring the temperature of the metal part to be processed, the input power of the pulsed current can be adjusted according to the monitoring results, so as to realize adjustable processing temperature of the metal part to be processed, improve the temperature control accuracy, and further improve the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0046] Figure 2 It is a schematic diagram of the structures of the first pressure component and the second pressure component;

[0047] Figure 3 It is Figure 2 an exploded schematic diagram of the structure;

[0048] Figure 4 It is Figure 2 a front elevation sectional view;

[0049] Figure 5 It is a schematic diagram of the structure of the second fixture;

[0050] Figure 6 It is a schematic diagram of an alloy bar clamped by a conductive clamp;

[0051] Figure 7 It is a schematic diagram of an alloy bar clamped by the fixture of this embodiment;

[0052] Figure 8 Microscopic schematic diagram of an alloy bar clamped by a conductive clamp

[0053] Figure 9 Microscopic schematic diagram of an alloy bar clamped by the present embodiment

[0054] Wherein, 1. First fixture; 2. Second fixture; 3. First insulating member; 4. First electrode plate; 5. Spring; 6. First limiting rod; 7. Second insulating member; 8. Second electrode plate; 9. Second limiting rod; 10. First fixture fixing member; 11. Second fixture fixing member; 12. Optical axis; 13. Frame; 14. Lead screw; 15. Lead screw nut; 16. Lead screw motor; 17. Pulse power supply; 18. Monitoring module; 19. Bracket; 20. Infrared temperature sensor; 21. Knurled nut. Detailed implementation manners

[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0056] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0057] Embodiment

[0058] An apparatus for pulsed current treatment of metal wire or sheet provided by an embodiment of the present invention includes: a first pressure assembly, at the bottom of which a first fixture 1 is provided; a second pressure assembly, at the top of which a second fixture 2 is provided. A clamping area is defined between the first fixture 1 and the second fixture 2. When the first fixture 1 and the second fixture 2 approach each other, the clamping area is adapted to the shape of the metal workpiece to be processed, and the metal workpiece to be processed can be fixed in the clamping area; the first pressure assembly can drive the first fixture 1 and the second fixture 2 to approach each other, and the second pressure assembly is a passive pressure application structure.

[0059] In this embodiment, the first pressure assembly includes: a first insulating member 3, the first insulating member 3 is in an inverted U shape, and the bottom of the first insulating member 3 defines a rectangular first accommodation cavity; the length of the first fixture 1 is the same as that of the first accommodation cavity and is arranged in the first accommodation cavity, a first electrode plate 4 is arranged on the upper surface of the first fixture 1, and the first electrode plate 4 is connected to the top wall of the first accommodation cavity through a spring 5 (it should be noted that the spring 5 has no fixed connection relationship with the first electrode plate 4 and the top wall of the first accommodation cavity and can be flexibly removed and replaced). The first insulating member 3 compresses the spring 5 to generate elastic force in the spring 5, and presses the first fixture 1 downward through the elastic force of the spring 5, driving the first fixture 1 to move downward and approach the second fixture 2; a first limiting rod 6 sequentially penetrates through the first fixture 1, the first electrode plate 4, the spring 5 and the first insulating member 3 in the vertical direction. The first electrode plate 4 and the first fixture 1 can move up and down along the first limiting rod 6. The lower end of the first limiting rod 6 has a limiting end, and the outer diameter of the limiting end is larger and can be stuck on the lower surface of the first fixture 1.

[0060] In this embodiment, the structure of the second pressure assembly is basically the same as that of the first pressure assembly, the difference being that the spring 5 is not provided. Specifically, the second pressure assembly includes: a second insulating member 7, the second insulating member 7 is in a U shape, and the top of the second insulating member 7 defines a rectangular second accommodation cavity; the length of the second fixture 2 is the same as that of the second accommodation cavity and is arranged in the second accommodation cavity, a second electrode plate 8 is arranged on the lower surface of the second fixture 2; a second limiting rod 9 sequentially penetrates through the second fixture 2, the second electrode plate 8 and the second insulating member 7 in the vertical direction. Correspondingly, the upper end of the second limiting rod 9 has a limiting end, and the outer diameter of the limiting end is larger and can be stuck on the upper surface of the second fixture 2. The first fixture 1 and the second fixture 2 are made of conductive materials. When the first electrode plate 4 and the second electrode plate 8 are energized, a pulsed current can be applied to the metal part to be processed through the first fixture 1 and the second fixture 2. The outer edges of the first insulating member 3 and the second insulating member 7 are joined and the outer surfaces are aligned. After the first insulating member 3 and the second insulating member 7 are butted, the whole is in a cuboid shape. The first accommodation cavity and the second accommodation cavity are in corresponding positions, and the first fixture 1 and the second fixture 2 are in corresponding positions.

[0061] In this embodiment, the first electrode plate 4 and the second electrode plate 8 extend outward to form extension parts, and the extension parts of the two electrode plates are connected through an electrical connector.

[0062] In this embodiment, it further includes: a first fixture fixing member 10. A first installation groove adapted to the shape of the first insulating member 3 is formed by upward depression at the bottom of the first fixture fixing member 10. The first insulating member 3 is embedded in the first installation groove. The first limiting rod 6 extends upward until it penetrates through the first fixture fixing member 10 and is connected to the first fixture fixing member 10 through a knurled nut 21. A second fixture fixing member 11. A second installation groove adapted to the shape of the second insulating member 7 is formed by downward depression at the top of the second fixture fixing member 11. The second insulating member 7 is embedded in the second installation groove. The second fixture fixing member 11 is provided with a threaded hole corresponding to the second limiting rod 9. The second limiting rod 9 extends downward and is connected to the threaded hole. The outer edges of the first fixture fixing member 10 and the second fixture fixing member 11 are joined and the outer surfaces are aligned. After the first fixture fixing member 10 and the second fixture fixing member 11 are butted, the whole is in a cuboid shape. The two are limited by four optical axes 12 penetrating through the first fixture fixing member 10 and the second fixture fixing member 11 from top to bottom. The four optical axes 12 are respectively arranged at four corners. The bottom ends of the optical axes 12 are fixed on the second fixture fixing member 11, and the first fixture fixing member 10 can slide along the optical axes 12.

[0063] In this embodiment, it further includes: a frame 13. A lead screw 14 is arranged horizontally on the frame 13. A lead screw nut 15 is arranged at the bottom of the second fixture fixing member 11. The second fixture fixing member 11 is threadedly connected to the lead screw 14 through the lead screw nut 15. A lead screw motor 16, whose output end is in transmission connection with the lead screw 14, is used to drive the lead screw 14 to rotate and drive the second fixture fixing member 11 to move along the lead screw 14. The lead screw motor 16 is arranged on the side of the frame 13. In this embodiment, a plurality of straight rails are arranged in parallel on both sides of the lead screw 14 on the frame 13. Sliders cooperating with the rails are arranged on both sides of the lead screw nut 15 at the bottom of the second fixture fixing member 11. The sliders can slide along the rails. The rails and the sliders limit the second fixture fixing member 11 to prevent the second fixture fixing member 11 from rotating synchronously with the lead screw 14.

[0064] In this embodiment, both ends of the metal to be processed are clamped by two sets of the devices disclosed in the above embodiments (hereinafter referred to as clamping devices). One set of clamping devices is arranged on the frame 13 in the movable manner disclosed in the above embodiments, and the other set of clamping devices is fixedly arranged on the frame 13. The two sets of clamping devices are arranged at intervals. When one set of clamping devices moves along the lead screw 14, the two sets of clamping devices approach or move away from each other. The pulse power supply 17 is arranged below the frame 13 and is used to supply power to the first electrode plate 4 and the second electrode plate 8. The input power of the pulse power supply 17 is adjusted by the controller; the monitoring module 18 is arranged on the frame 13 through the bracket 19. The monitoring module 18 has an infrared temperature sensor 20 for sensing the temperature of the metal workpiece to be processed. The temperature monitoring positions are at least arranged at the clamping positions of the metal to be processed and the middle section position of the metal. When the infrared temperature sensor 20 senses that the temperature of the metal workpiece to be processed is relatively high, the input power of the pulse power supply 17 can be reduced. When the temperature of the metal workpiece to be processed is relatively low, the input power of the pulse power supply 17 can be increased.

[0065] An embodiment of the present invention further provides a method for processing a metal wire or sheet by pulse current, which applies the device for processing a metal wire or sheet by pulse current disclosed in this embodiment, and includes the following steps:

[0066] S1: Confirm the shapes of the first fixture 1 and the second fixture 2 according to the shape of the metal workpiece to be processed, so that the clamping area is adapted to the shape of the metal workpiece to be processed;

[0067] S2: Confirm the clamping force between the first fixture 1 and the second fixture 2 according to the diameter or thickness of the metal workpiece to be processed and confirm the corresponding elastic force of the spring 5, and select a spring 5 that can generate the corresponding elastic force after compression;

[0068] S3: Clamp the metal workpiece to be processed between the first fixture 1 and the second fixture 2, lock the knurled nut 21 and install the optical axis 12;

[0069] S4: Supply power to the first electrode plate 4 and the second electrode plate 8, and apply pulse current to the metal workpiece to be processed through the first fixture 1 and the second fixture 2.

[0070] Test example:

[0071] Experimental materials: Alloy rod with a diameter of 6 mm, a length of 50 mm, and GWZ932K.

[0072] Experimental parameters: Current density 25 A / mm 2 , energization time 300 s, current frequency 400 Hz, duty cycle 50%.

[0073] Clamping method: Conductive clamps and this embodiment are respectively used for clamping.

[0074] Experimental results: As Figure 6 andFigure 7 As shown, it can be seen that the alloy bar using the conductive clamp has a middle bend, while the surface of the alloy bar of this embodiment is neat without problems of bending or deformation.

[0075] As Figure 8 and Figure 9 shown, since this embodiment can achieve uniform lateral current and force distribution in the metal, the microstructure distribution of the metal processed by this embodiment is more uniform.

[0076] The temperatures at the middle and both ends of the alloy bar are detected. The results show that the temperature at the middle of the alloy bar using the conductive clamp is about 300 °C, and the temperatures at both ends are about 230 °C. The temperatures at the middle and both ends of the alloy bar of this embodiment are about 260 °C and the overall temperature tends to be consistent.

[0077] In summary, compared with the prior art, this embodiment can effectively improve the force uniformity, current distribution uniformity, product microstructure distribution uniformity, and temperature uniformity of the metal workpiece to be processed.

[0078] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0079] The above-described embodiments are only descriptions of the preferred modes of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for pulse current treatment of metal wire or plate, characterized in that: include: A first pressure assembly, a first clamp (1) being provided at the bottom thereof; A second pressure assembly, a second clamp (2) is arranged on the top of which, a clamping area is defined between the first clamp (1) and the second clamp (2), and the clamping area is adapted to the shape of the metal part to be processed; The first pressure component is capable of driving the first clamp (1) and the second clamp (2) to move closer to each other; The first pressure component comprises: A first insulating member (3), the bottom of which defines a first accommodating cavity; the first clamp (1) is arranged in the first accommodating cavity, a first electrode plate (4) is arranged on the upper surface of the first clamp (1), the first electrode plate (4) is connected to the top wall of the first accommodating cavity via a spring (5), the first insulating member (3) applies pressure to the first clamp (1) from top to bottom via the spring (5), and drives the first clamp (1) and the second clamp (2) to approach each other; A first limiting rod (6) vertically passes through the first clamp (1), the first pole plate (4), the spring (5) and the first insulating member (3) in sequence, and the first pole plate (4) and the first clamp (1) are capable of moving up and down along the first limiting rod (6); The second pressure component comprises: a second insulating member (7), wherein the top of the second insulating member (7) defines a second accommodating cavity; the second clamp (2) is arranged in the second accommodating cavity, and a second electrode plate (8) is arranged on the lower surface of the second clamp (2); A second limiting rod (9) vertically passes through the second clamp (2), the second electrode plate (8) and the second insulating member (7) in sequence; The first clamp (1) and the second clamp (2) are made of conductive material, the outer edges of the first insulating member (3) and the second insulating member (7) are connected, the first accommodating cavity and the second accommodating cavity are located in corresponding positions, and the first clamp (1) and the second clamp (2) are located in corresponding positions.

2. The device for pulse current treatment of metal wire or plate according to claim 1, characterized in that: Also includes: A first clamp fixing member (10), the bottom of which is recessed upward to form a first installation groove, the first insulating member (3) is embedded in the first installation groove, and the first limiting rod (6) extends upward and is connected to the first clamp fixing member (10) via a knurled nut (21); A second clamp fixing member (11), the top of which is recessed downward to form a second mounting groove, the second insulating member (7) is embedded in the second mounting groove, and the second limiting rod (9) extends downward and is connected to the second clamp fixing member (11); The outer edges of the first clamp fixing piece (10) and the second clamp fixing piece (11) are connected.

3. The device for pulse current treatment of metal wire or plate according to claim 2, characterized in that: It also comprises a plurality of optical axes (12), wherein the optical axes (12) penetrate the first clamp fixing member (10) and the second clamp fixing member (11) from top to bottom, and the first clamp fixing member (10) or the second clamp fixing member (11) is capable of sliding along the optical axes (12).

4. The device for pulse current treatment of metal wire or plate according to claim 3, characterized in that: Also includes: A frame (13), a lead screw (14) being arranged on the frame (13), a lead screw nut (15) being arranged at the bottom of the second clamp fixing member (11), and the second clamp fixing member (11) being threadedly connected to the lead screw (14) via the lead screw nut (15); The lead screw motor (16) is drivingly connected to the lead screw (14) and is used to drive the lead screw (14) to rotate and drive the second fixture fixing member (11) to move along the lead screw (14).

5. The device for pulse current treatment of metal wire or plate according to claim 4, characterized in that: Also includes: A pulse power supply (17), arranged below the frame (13), and used to supply power to the first electrode plate (4) and the second electrode plate (8); A monitoring module (18) is arranged on the frame (13) and is used to monitor the temperature of the metal part to be processed.

6. A method for treating a metal wire or plate with pulse current, characterized in that: The device for pulse current treatment of metal wire or plate material according to any one of claims 3 to 5 comprises the following steps: S1: determining the shapes of the first clamp (1) and the second clamp (2) according to the shape of the metal workpiece to be processed, so that the clamping area is adapted to the shape of the metal workpiece to be processed; S2: confirming the clamping force between the first clamp (1) and the second clamp (2) and the corresponding elastic force of the spring (5) according to the diameter or thickness of the metal workpiece to be processed; S3: clamping the metal workpiece to be processed between the first clamp (1) and the second clamp (2), tightening the knurled nut (21) and installing the optical axis (12); S4: Power is supplied to the first electrode plate (4) and the second electrode plate (8), and a pulse current is applied to the metal workpiece to be processed through the first clamp (1) and the second clamp (2).

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