Device and method for pulse current treatment of metal wires and plates

Abstract

The invention discloses a metal wire and plate pulse current treatment device and method, and relates to the technical field of electric pulse metal machining, the metal wire and plate pulse current treatment device comprises a first pressure assembly and a second pressure assembly, a second clamp is arranged at the top of the second pressure assembly, a clamping area is defined between the first clamp and the second clamp, and the clamping area is matched with the to-be-machined metal piece in shape; the first pressure assembly and / or the second pressure assembly can drive the first clamp and the second clamp to get close to each other. And the clamping force of the clamp is uniformly distributed on the surface of the to-be-processed metal piece, so that metal bending and stretching caused by electrification can be avoided. When current is introduced into the polar plates corresponding to the first clamp and the second clamp, the current density can be improved, and a structural basis is provided for application of high-density current. The current can be uniformly distributed on the surface of the to-be-processed metal piece, so that the internal temperature of the metal is uniform.

Description

Technical Field

[0001] The invention relates to the technical field of electric pulse metal processing, in particular to a device and method for pulse current processing of metal wires and plates. Background Art

[0002] Electroplastic processing is to apply pulse current to metal materials to make them stretch and achieve plastic processing effects. It has been used in the processing of metals such as titanium alloys, aluminum alloys, magnesium alloys and steel. Pulse current assisted processing technology is to pass high-frequency pulse current through both ends of metal wires or plates to achieve electroplastic processing using high-frequency pulse current. Existing pulse current assisted processing technology has the following defects:

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

[0004] Second, since the contact area between the conductive clip and the metal is small, the current density passing through is small, and high-density current cannot be applied to the metal.

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

[0006] Fourth, the existing pulse current energizing device has low applicability and cannot process multiple groups of wires with different wire diameters at the same time, nor can it be used for wires and plates at the same time.

[0007] In view of this, how to provide a pulse current machining device that can partially or completely solve the above-mentioned technical problems is an issue that technical personnel in this field urgently need to solve. Summary of the invention

[0008] The purpose of the present invention is to provide a device and method for pulse current treatment of metal wires and plates to solve the problems existing in the prior art.

[0009] To achieve the above object, the present invention provides a device for pulse current treatment of metal wires and plates, comprising:

[0010] A first pressure assembly, a first clamp is disposed at the bottom thereof;

[0011] A second pressure assembly, a second clamp is disposed on the top of which, 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 part to be processed;

[0012] The first pressure component can drive the first clamp and the second clamp to move closer to each other.

[0013] The first pressure component comprises:

[0014] A first insulating member, wherein the bottom of the first insulating member defines a first accommodating cavity; the first clamp is disposed in the first accommodating cavity, a first electrode plate is disposed on the upper surface of the first clamp, and the first electrode plate is connected to the top wall of the first accommodating cavity through a spring, and the first insulating member applies pressure to the first clamp from top to bottom through the spring, and drives the first clamp and the second clamp to approach each other;

[0015] The first limiting rod passes through the first clamp, the first pole plate, the spring and the first insulating member in sequence along the vertical direction, and the first pole plate and the first clamp can move up and down along the first limiting rod.

[0016] Furthermore, the second pressure component includes:

[0017] A second insulating member, wherein the top of the second insulating member defines a second accommodating cavity; the second clamp is disposed in the second accommodating cavity, and a second electrode plate is disposed on the lower surface of the second clamp;

[0018] A second limiting rod, which passes through the second clamp, the second electrode plate and the second insulating member in sequence along the vertical direction;

[0019] The first clamp and the second clamp are made of conductive material, the outer edges of the first insulating member and the second insulating member are connected, the first accommodating cavity and the second accommodating cavity are located correspondingly, and the first clamp and the second clamp are located correspondingly.

[0020] Furthermore, it also includes:

[0021] A first clamp 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, and the first limiting rod extends upward and is connected to the first clamp fixing member through a knurled nut;

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

[0023] The outer edges of the first clamp fixing member and the second clamp fixing member are connected.

[0024] Furthermore, it also includes a plurality of optical axes, wherein the optical axes penetrate the first fixture and the second fixture from top to bottom, and the first fixture or the second fixture can slide along the optical axes.

[0025] Furthermore, it also includes:

[0026] A frame, wherein a lead screw is disposed on the frame, a lead screw nut is disposed at the bottom of the second fixture fixing piece, and the second fixture fixing piece is threadedly connected to the lead screw through the lead screw nut;

[0027] The lead screw motor is drivingly connected to 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 also 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] The monitoring module is arranged on the frame and is used to monitor the temperature of the metal parts to be processed.

[0031] The present invention also provides a method for treating metal wires and plates with pulse current, and a device for treating metal wires and plates with pulse current, comprising the following steps:

[0032] S1: determining the shapes of the first clamp and the second clamp 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: confirming the clamping force between the first clamp and the second clamp and the corresponding spring force according to the diameter or thickness of the metal workpiece to be processed;

[0034] S3: clamp the metal part to be processed between the first clamp and the second clamp, tighten the knurled nut and install the optical axis;

[0035] S4: Power is supplied to the first electrode plate and the second electrode plate, and a pulse current is applied to the metal part to be processed through the first fixture and the second fixture.

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

[0037] 1. A clamping area adapted to the shape of the metal workpiece to be processed is defined between the first clamp and the second clamp. Compared with the conductive clamp in the prior art, the contact area between the clamp 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, which can avoid metal bending and stretching caused by power supply.

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

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

[0041] 2. The clamping force between the first clamp and the second clamp is determined by the elastic force generated by the compression of the spring. Therefore, springs with different parameters can be set according to different metal parts to be processed to ensure that the clamp fits tightly with the metal parts to be processed, and the metal parts to be processed are subjected to reasonable force, which can further avoid lateral bending and stretching of the metal, achieve uniform lateral current distribution of the metal, and improve the uniformity of the distribution of the microstructure of the metal after processing.

[0042] 3. The first clamp and the second clamp are limited only by the limit rod, and there is no fixed connection between them and the insulating part. That is, they are detachably arranged in the first insulating part and the second insulating part. The required clamp 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 outermost clamp fixing part of the equipment realizes the moving function through the lead screw, which further expands the scope of application of the equipment.

[0043] 4. By monitoring the temperature of the metal parts to be processed, the input power of the pulse current can be adjusted according to the monitoring results to achieve adjustable processing temperature of the metal parts to be processed, improve temperature control accuracy and thus improve product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[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 structure of the first pressure component and the second pressure component;

[0047] Figure 3 for Figure 2 Schematic diagram of structural explosion;

[0048] Figure 4 for Figure 2 Front view section view;

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

[0050] Figure 6 Schematic diagram of alloy rod clamped by conductive clamp;

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

[0052] Figure 8 This is a microscopic diagram of an alloy bar clamped by a conductive clamp;

[0053] Fig. 9 This is a microscopic schematic diagram of an alloy bar clamped by this embodiment;

[0054] Among them, 1. the first clamp; 2. the second clamp; 3. the first insulating member; 4. the first electrode; 5. the spring; 6. the first limiting rod; 7. the second insulating member; 8. the second electrode; 9. the second limiting rod; 10. the first clamp fixing member; 11. the second clamp fixing member; 12. the optical axis; 13. the frame; 14. the screw; 15. the screw nut; 16. the screw motor; 17. the pulse power supply; 18. the monitoring module; 19. the bracket; 20. the infrared temperature sensor; 21. the knurled nut. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] Example

[0058] An embodiment of the present invention provides a device for pulse current processing of metal wires and plates, including: a first pressure component, a first clamp 1 is arranged at the bottom of the component; a second pressure component, a second clamp 2 is arranged at the top of the component, and a clamping area is defined between the first clamp 1 and the second clamp 2. When the first clamp 1 and the second clamp 2 are close to each other, the clamping area is adapted to the shape of the metal part to be processed, and the metal part to be processed can be fixed in the clamping area; the first pressure component can drive the first clamp 1 and the second clamp 2 to approach each other, and the second pressure component is a passive pressure 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 accommodating cavity; the first fixture 1 is the same length as the first accommodating cavity and is arranged in the first accommodating cavity, the upper surface of the first fixture 1 is provided with a first electrode plate 4, and the first electrode plate 4 is connected to the top wall of the first accommodating 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 accommodating cavity, and can be flexibly removed and replaced), the first insulating member 3 compresses the spring 5 to generate elastic force, and the elastic force of the spring 5 applies pressure to the first fixture 1 from top to bottom, driving the first fixture 1 to move downward and approach the second fixture 2; the first limiting rod 6 passes through the first fixture 1, the first electrode plate 4, the spring 5 and the first insulating member 3 in sequence in the vertical direction, and 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 large, which 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, except that the spring 5 is not provided. Specifically, the second pressure assembly includes: a second insulating member 7, which is U-shaped, and the top of the second insulating member 7 defines a rectangular second accommodating cavity; the second fixture 2 is the same length as the second accommodating cavity and is arranged in the second accommodating cavity, and the lower surface of the second fixture 2 is provided with a second electrode plate 8; the second limiting rod 9 passes through the second fixture 2, the second electrode plate 8 and the second insulating member 7 in sequence in the vertical direction, and accordingly, the upper end of the second limiting rod 9 has a limiting end, and the outer diameter of the limiting end is large, which 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 pulse current can be applied to the metal part to be processed by 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 connected and the outer surfaces are aligned. After the first insulating member 3 and the second insulating member 7 are connected, the whole is a rectangular parallelepiped. The first accommodating cavity and the second accommodating cavity correspond in position, and the first clamp 1 and the second clamp 2 correspond in position.

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

[0062] In this embodiment, it also includes: a first clamp fixing member 10, the bottom of the first clamp fixing member 10 is recessed upward to form a first installation groove that matches the shape of the first insulating member 3, the first insulating member 3 is embedded in the first installation groove, the first limit rod 6 extends upward until it passes through the first clamp fixing member 10 and is connected to the first clamp fixing member 10 through the knurled nut 21; a second clamp fixing member 11, the top of the second clamp fixing member 11 is recessed downward to form a second installation groove that matches the shape of the second insulating member 7, the second insulating member 7 is embedded in the second installation groove, the second clamp fixing member 11 is provided with a screw hole corresponding to the second limit rod 9, and the second limit rod 9 extends downward and is connected to the screw hole. The outer edges of the first clamp fixing member 10 and the second clamp fixing member 11 are connected and the outer surfaces are aligned. After the first clamp fixing member 10 and the second clamp fixing member 11 are connected, the whole is a rectangular parallelepiped. The four optical axes 12 penetrate the first clamp fixing member 10 and the second clamp fixing member 11 from top to bottom to achieve the limitation of the two. The four optical axes 12 are respectively arranged at four corners, and the bottom ends of the optical axes 12 are fixed on the second clamp fixing member 11. The first clamp fixing member 10 can slide along the optical axes 12.

[0063] In this embodiment, it also includes: a frame 13, a lead screw 14 is arranged on the frame 13 in the horizontal direction, a lead screw nut 15 is arranged at the bottom of the second clamp fixing part 11, and the second clamp fixing part 11 is threadedly connected with the lead screw 14 through the lead screw nut 15; a lead screw motor 16, whose output end is transmission-connected with the lead screw 14, used to drive the lead screw 14 to rotate and drive the second clamp fixing part 11 to move along the lead screw 14, and the lead screw motor 16 is arranged on the side of the frame 13. In this embodiment, the frame 13 is parallelly provided with a plurality of straight guide rails on both sides of the lead screw 14, and the bottom of the second clamp fixing part 11 is provided with sliders matching with the guide rails on both sides of the lead screw nut 15, and the sliders can slide along the guide rails, and the guide rails and the sliders play a limiting role on the second clamp fixing part 11, so as to prevent the second clamp fixing part 11 from rotating synchronously with the lead screw 14.

[0064] In this embodiment, the two ends of the metal to be processed are clamped by two groups of devices disclosed in the above embodiments (hereinafter referred to as clamping devices), one group of clamping devices is arranged on the frame 13 in a movable manner disclosed in the above embodiments, and the other group of clamping devices is fixedly arranged on the frame 13. The two groups of clamping devices are arranged at intervals. When one group of clamping devices moves along the lead screw 14, the two groups 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 plate 4 and the second 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 to be processed. The temperature monitoring position is at least set at the clamping position of the metal to be processed and the middle position of the metal. When the infrared temperature sensor 20 senses that the temperature of the metal to be processed is high, the input power of the pulse power supply 17 can be reduced, and when the temperature of the metal to be processed is low, the input power of the pulse power supply 17 can be increased.

[0065] The embodiment of the present invention further provides a method for treating metal wires and plates with pulse current. The device for treating metal wires and plates with pulse current disclosed in the embodiment includes the following steps:

[0066] S1: Determine 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;

[0067] 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, and selecting the 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, tighten the knurled nut 21 and install the optical axis 12;

[0069] 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 fixture 1 and the second fixture 2.

[0070] Test example:

[0071] Experimental materials: GWZ932K alloy rods with a diameter of 6 mm and a length of 50 mm.

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

[0073] Clamping method: The conductive clamp and the present embodiment are used for clamping respectively.

[0074] Experimental results: Figure 6 and Figure 7 As shown, it can be seen that the alloy rod using the conductive clip is bent in the middle, while the alloy rod using this embodiment has a neat surface without bending or deformation problems.

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

[0076] The temperatures in the middle and at both ends of the alloy rod were tested, and the results showed that the temperature in the middle of the alloy rod using the conductive clamp was about 300°C, and the temperature at both ends was about 230°C. The temperature in the middle and at both ends of the alloy rod using this embodiment was about 260°C, and the overall temperature tended 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 terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply 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 understood as a limitation on the present invention.

[0079] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for pulse current treatment of metal wires and plates, 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) passes through the first clamp (1), the first pole plate (4), the spring (5) and the first insulating member (3) in sequence in a vertical direction; the first pole plate (4) and the first clamp (1) are capable of moving up and down along the first limiting rod (6).

2. The device for pulse current treatment of metal wire and plate according to claim 1, characterized in that: 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.

3. The device for pulse current treatment of metal wire and plate according to claim 2, 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.

4. The device for pulse current treatment of metal wire and plate according to claim 3, 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).

5. The device for pulse current treatment of metal wire and plate according to claim 4, 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).

6. The device for pulse current treatment of metal wire and plate according to claim 5, 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.

7. A method for treating metal wires and plates with pulse current, characterized in that: The device for pulse current treatment of metal wire and plate material according to any one of claims 4 to 6 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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