Electroplastic drawing device and method suitable for high carbon steel wires

Abstract

The application discloses an electroplastic drawing device suitable for high-carbon steel wires, which comprises a metal supporting plate, two guide wheels, two conductive wheels and a direct-current pulse power source; the guide wheels are connected to the side surfaces of the metal supporting plate at intervals, and the two conductive wheels are connected to the side surfaces of the metal supporting plate between the two guide wheels; the conductive wheel comprises an insulating nonmetal inner ring and a nonmetal outer ring, the nonmetal outer ring is rotationally connected to the nonmetal inner ring, and the nonmetal outer ring is connected with a conductive groove outer ring; a mandrel A is connected to the center of the nonmetal inner ring, the inner side end of the mandrel A is insulated and connected to the metal supporting plate, the outer side end of the mandrel A is conductive and electrically connected with the groove outer ring, and the mandrel A is connected to the direct-current pulse power source through a wire. Compared with the prior art, the application can generate electronic wind force and Joule heat effect in the steel wire, the steel wire can drive dislocation movement under the two effects, the drawing resistance is reduced, and the surface quality and plasticity of the steel wire are improved.

Description

Technical Field

[0001] This invention relates to the field of metal forming and processing technology, and in particular to an electroplastic drawing device and method suitable for high carbon steel wire. Background Technology

[0002] High-carbon steel cord wire is widely used as a material for steel cord products. After being drawn using traditional dies, the wire undergoes work hardening, resulting in higher strength and significantly reducing wire usage and the weight of the finished product. Therefore, improving the tensile strength of the wire is of great significance. However, at the same time, the work hardening process of this type of high-carbon steel wire drastically reduces its plasticity, causing uneven twisting, wire breakage, and a series of other production problems during steel cord twisting, ultimately affecting the quality of the steel cord. Furthermore, the increased strength also tends to result in poorer surface quality of the wire, increasing the risk of crack initiation and propagation.

[0003] According to the theory of metal deformation, metal drawing is a process of stress-driven dislocation movement. During dislocation movement, if a certain pulsed current is applied, a high-density electron wind will be formed in the metal. The wind pressure generated by the electron wind helps to push the moving dislocations and reduces the resistance to dislocation movement. Macroscopically, this manifests as a reduction in the metal's deformation resistance, thus improving the metal's deformation capacity and plasticity. Simultaneously, under the action of high-intensity pulsed current, the internal stress and microstructure of the steel wire will also undergo a series of changes, improving the quality of the steel wire. However, while existing electro-plastic drawing forming devices can improve plasticity, they are prone to frequent sparking, severely reducing the surface quality of the steel wire. Currently, with increasingly stringent requirements for higher strength, finer diameter, and environmental protection of steel cords, there is an urgent need to develop an electro-plastic drawing forming device that can improve the plasticity and surface quality of high-strength steel wire without sparking. Summary of the Invention

[0004] The present invention aims to provide an electroplastic drawing device and method suitable for high carbon steel wire, wherein the conductive wheel is conductively connected by a copper brush to ensure stable and smooth conduction, and the groove of the conductive wheel is arc-shaped to fit the shape of the steel wire, resulting in a larger contact area. In addition, the device can pre-tension the steel wire to further improve the stability of current conduction, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An electro-plastic drawing device for high-carbon steel wire includes a metal support plate, two guide wheels, two conductive wheels, and a DC pulse power supply. The guide wheels are spaced apart and connected to the sides of the metal support plate, and the two conductive wheels are connected to the sides of the metal support plate between the two guide wheels. Each conductive wheel includes an insulated non-metallic inner ring and a non-metallic outer ring, with the non-metallic outer ring rotatably connected to the non-metallic inner ring. A conductive grooved outer ring is connected to the non-metallic outer ring. A mandrel A is connected to the center of the non-metallic inner ring. The inner end of the mandrel A is insulated and connected to the metal support plate, while the outer end of the mandrel A is conductive and electrically connected to the grooved outer ring. The mandrel A is connected to the DC pulse power supply via a wire.

[0006] A further embodiment of the present invention is that the metal support plate is provided with riveting holes as needed, and the two guide wheels are riveted to the metal support plate through the mandrel B, and the inner end of the mandrel A at the center of the guide wheel is riveted to the metal support plate.

[0007] A further embodiment of the present invention is that the non-metallic inner ring and the non-metallic outer ring are arranged in two symmetrical sets, and a set of rolling steel balls is provided between the non-metallic inner ring and the non-metallic outer ring in the same set. Each set of rolling steel balls consists of several balls arranged in a circular array. One side of the rolling steel ball is in contact with the non-metallic inner ring, and the other side is in contact with the non-metallic outer ring.

[0008] A further embodiment of the present invention is that the grooved outer ring is disposed in the middle of the two non-metallic outer rings, and a conductive copper ring is connected between the two non-metallic inner rings. The inner circular surface of the grooved outer ring is fixedly connected to one end of the conductive copper brush, and the other end of the conductive copper brush is interference-fitted with the outer circular surface of the conductive copper ring. The outer conductive end of the spindle A is interference-fitted with the inner circular surface of the conductive copper ring.

[0009] A further aspect of the present invention is that a sealing ring is connected to the gap between the non-metallic inner ring and the non-metallic outer ring, and the sealing ring is clamped by a clamp.

[0010] A further aspect of the present invention is that both the non-metallic inner ring and the non-metallic outer ring are made of high-molecular polyurethane material, and the contact points between the rolling steel ball and the non-metallic inner ring and the non-metallic outer ring are lubricated with grease.

[0011] A further aspect of the present invention is that the outer ring of the groove is made of copper, and the groove of the outer ring is an arc shape that fits the shape of the steel wire.

[0012] A further aspect of the present invention is that two wires are connected to the outer end of the mandrel A, and the other ends of the two wires are connected to a DC pulse power supply.

[0013] An electro-plastic drawing method suitable for high-carbon steel wire includes the following steps: S1. Pass the steel wire with the drawing die through the first guide wheel, the first conductive wheel, the second conductive wheel and the second guide wheel in sequence and tension it. The drawing die is located in the middle of the two conductive wheels. After adjusting the position, rivet and fix the metal support plate. S2. One end of each of the two wires is connected to the spindle A between the two conductive wheels, and the other end of the two wires is connected to the pulse power supply. At this time, it is necessary to make the direction of movement of the steel wire between the two conductive wheels consistent with the direction of the current. S3. Turn on the pulse power supply and adjust the duty cycle and current according to parameters such as the speed of the steel wire movement and the diameter of the steel wire.

[0014] The beneficial effects of this invention are: The electroplastic drawing device and method of the present invention, applicable to high carbon steel wire, can generate electron wind and Joule heating effect inside the steel wire. Under these two effects, the steel wire can drive dislocation movement, reduce drawing resistance, improve the surface quality and plasticity of the steel wire.

[0015] The electroplastic drawing device and method of the present invention, applicable to high carbon steel wire, can avoid the electric arcing phenomenon generated during current conduction and improve the reliability and stability of the electroplastic drawing device. Attached Figure Description

[0016] Figure 1 This is an overall front view of the present invention.

[0017] Figure 2 This is an overall isometric view of the present invention.

[0018] Figure 3 This is a cross-sectional view of the conductive wheel of the present invention.

[0019] Figure 4 This is a comparison diagram of the torsion performance of steel wires drawn using the conventional drawing process in Example 1 and the electro-plastic drawing process of the present invention.

[0020] Figure 5 This is a comparison diagram of the torsion performance of steel wires drawn using the conventional drawing process in Example 1 and the electro-plastic drawing process of the present invention.

[0021] In the diagram: 1-Metal support plate, 2-Guide wheel, 3-Conductive wheel, 301-Non-metallic inner ring, 302-Non-metallic outer ring, 303-Groove outer ring, 304-Rolling steel ball, 305-Conductive copper ring, 306-Conductive copper brush, 307-Sealing ring, 4-DC pulse power supply, 5-Mandrel A, 6-Wire, 7-Mandrel B, 8-Drawing die, 9-Steel wire. Detailed Implementation

[0022] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1-3As shown, an electro-plastic drawing device suitable for high carbon steel wire includes a metal support plate 1, two guide wheels 2, two conductive wheels 3, and a DC pulse power supply 4. The guide wheels 2 are spaced apart and connected to the side of the metal support plate 1, and the two conductive wheels 3 are connected to the side of the metal support plate 1 between the two guide wheels 2. The conductive wheel 3 includes an insulated non-metallic inner ring 301 and a non-metallic outer ring 302. The non-metallic outer ring 302 is rotatably connected to the non-metallic inner ring 301, and a conductive grooved outer ring 303 is connected to the non-metallic outer ring 302. A mandrel A5 is connected to the center of the non-metallic inner ring 301. The inner end of the mandrel A5 is insulated and connected to the metal support plate 1, and the outer end of the mandrel A5 is conductive and electrically connected to the grooved outer ring 303. The mandrel A5 is connected to the DC pulse power supply 4 through a wire 6.

[0024] The metal support plate 1 is provided with riveting holes as needed. The two guide wheels 2 are riveted to the metal support plate 1 through the mandrel B7. The inner end of the mandrel A5 at the center of the conductive wheel 3 is riveted to the metal support plate 1.

[0025] The non-metallic inner ring 301 and the non-metallic outer ring 302 are two sets arranged symmetrically. A set of rolling steel balls 304 is provided between the non-metallic inner ring 301 and the non-metallic outer ring 302 in the same set. Each set of rolling steel balls 304 consists of several balls arranged in a circular array. One side of the rolling steel ball 304 is in contact with the non-metallic inner ring 301, and the other side is in contact with the non-metallic outer ring 302.

[0026] The grooved outer ring 303 is located between the two non-metallic outer rings 302. A conductive copper ring 305 is connected between the two non-metallic inner rings 301. The inner circular surface of the grooved outer ring 303 is fixedly connected to one end of the conductive copper brush 306. The other end of the conductive copper brush 306 is press-fitted with the outer circular surface of the conductive copper ring 305. The outer conductive end of the spindle A5 is press-fitted with the inner circular surface of the conductive copper ring 305.

[0027] A sealing ring 307 is connected to the gap between the non-metallic inner ring 301 and the non-metallic outer ring 302, and the sealing ring 307 is clamped by a clamp.

[0028] Both the non-metallic inner ring 301 and the non-metallic outer ring 302 are made of high-molecular polyurethane material, and the contact points between the rolling steel ball 304 and the non-metallic inner ring 301 and the non-metallic outer ring 302 are lubricated with grease.

[0029] The outer ring 303 of the groove is made of copper, and the groove of the outer ring 303 is an arc shape that fits the shape of the steel wire 9.

[0030] Two wires 6 are connected to the outer end of the spindle A5, and the other ends of the two wires 6 are connected to the DC pulse power supply 4.

[0031] The basic principle of electroplastic drawing in this invention is as follows: the non-metallic inner ring 301, non-metallic outer ring 302, and rolling steel balls 304 of the conductive wheel 3 form a bearing-like structure, providing mechanical support for the conductive wheel 3. Simultaneously, the non-metallic inner ring 301 and non-metallic outer ring 302 are made of high-molecular polyurethane material, ensuring strength while remaining non-conductive. The grooved outer ring 303, conductive copper brush 306, and conductive copper ring 305 are all made of copper, exhibiting good conductivity. When current passes through the copper column, it flows through the conductive copper ring 305, through the conductive copper brush 306, and into the grooved outer ring 303. The steel wire 9 contacts the grooved outer ring 303, and finally, current enters the steel wire 9. At this point, the pulsed current exerts an electroplastic drawing effect on the steel wire 9. Example 1

[0032] ①. Draw a 97C carbon equivalent, 1.48mm diameter brass-plated martensitic steel wire 9 to a 0.20mm MT steel wire 9, thread the steel wire 9 through the die and adjust the machine table according to the wet drawing process card.

[0033] ②. Adjust the positions of the guide wheel 2 and the conductive wheel 3 of the electroplastic drawing device. Position the drawing die 8 so that the steel wire 9 passes sequentially through the guide wheel 2 and the conductive wheel 6, ultimately achieving linear tension in the steel wire 9. Position the drawing die 8 in the middle of the conductive wheel 3. After adjustment, fix the metal support plate 1.

[0034] ③. Two wires 6 are respectively connected to the outer ends of the two conductive wheels 3 spindle A5 and the positive and negative terminals of the pulse power supply to ensure that the current flow direction of the steel wire 9 is consistent with the pulling direction of the steel wire 9.

[0035] ④. Set the drawing speed to 4m / s, run the machine, and after the steel wire 9 is running at full speed, turn on the pulse power supply, where the pulse current is 5A and the duty cycle is 50%.

[0036] ⑤. Pulling 5000m of steel wire 9, the current was observed to be stable at 5A without fluctuation during the pulling process, and the tension of the steel wire 9 in the pulling die 8 was stable without fluctuation and there was no sparking.

[0037] ⑥. Observe the meter counter. After pulling 5000m, turn off the pulse power and stop the machine. Electroplastic pulling is complete.

[0038] Observation of steel wire 9 showed that the surface quality was good, and the torsion performance of steel wire 9 was as follows. Figure 4 As shown. Example 2

[0039] ①. Draw a 92C carbon equivalent, 1.48mm diameter brass-plated sorbitic steel wire 9 to a 0.20mm UT steel wire 9, thread the steel wire 9 through the die and adjust the machine table according to the wet drawing process card.

[0040] ②. Adjust the positions of the guide wheel 2 and the conductive wheel 3 of the electroplastic drawing device. Position the drawing die 8 so that the steel wire 9 passes sequentially through the guide wheel 2 and the conductive wheel 6, ultimately achieving linear tension in the steel wire 9. Position the drawing die 8 in the middle of the conductive wheel 3. After adjustment, fix the metal support plate 1.

[0041] ③. Two wires 6 are respectively connected to the outer ends of the two conductive wheels 3 spindle A5 and the positive and negative terminals of the pulse power supply to ensure that the current flow direction of the steel wire 9 is consistent with the pulling direction of the steel wire 9.

[0042] ④. Set the drawing speed to 6m / s, run the machine, and after the steel wire 9 is running at full speed, turn on the pulse power supply, where the pulse current is 5A and the duty cycle is 50%.

[0043] ⑤. Pulling 5000m of steel wire 9, the current was observed to be stable at 5A without fluctuation during the pulling process, and the tension of the steel wire 9 in the pulling die 8 was stable without fluctuation and there was no sparking.

[0044] ⑥. Observe the meter counter. After pulling 5000m, turn off the pulse power and stop the machine. Electroplastic pulling is complete.

[0045] Observation of steel wire 9 showed that the surface quality was good, and the torsion performance of steel wire 9 was as follows. Figure 5 As shown.

[0046] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent transformations or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An electro-plastic drawing device suitable for high carbon steel wire, characterized in that: The device includes a metal support plate (1), two guide wheels (2), two conductive wheels (3), and a DC pulse power supply (4). The guide wheels (2) are spaced apart and connected to the side of the metal support plate (1). The two conductive wheels (3) are connected to the side of the metal support plate (1) between the two guide wheels (2). The conductive wheel (3) includes an insulated non-metallic inner ring (301) and a non-metallic outer ring (302). The non-metallic outer ring (302) is rotatably connected to the non-metallic inner ring (301). A conductive grooved outer ring (303) is connected to the non-metallic outer ring (302). The drawing die (8) is located in the middle of the two conductive wheels (3). A mandrel A (5) is connected to the center of the non-metallic inner ring (301). The inner end of the mandrel A (5) is insulated and connected to the metal support plate (1). The outer end of the mandrel A (5) is conductive and electrically connected to the grooved outer ring (303). The mandrel A (5) is connected to the DC pulse power supply through a wire (6). Pulse power supply (4); The non-metallic inner ring (301) and the non-metallic outer ring (302) are two sets symmetrically arranged. A set of rolling steel balls (304) is provided between the non-metallic inner ring (301) and the non-metallic outer ring (302) in the same set. Each set of rolling steel balls (304) consists of several balls arranged in a ring array. One side of the rolling steel ball (304) is embedded in contact with the non-metallic inner ring (301), and the other side is embedded in contact with the non-metallic outer ring (302). The grooved outer ring (303) is located between the two non-metallic outer rings (302), and a conductive copper ring (305) is connected between the two non-metallic inner rings (301). The inner circular surface of the grooved outer ring (303) is fixedly connected to one end of the conductive copper brush (306), and the other end of the conductive copper brush (306) is interference-fitted with the outer circular surface of the conductive copper ring (305). The outer conductive end of the spindle A (5) is interference-fitted with the inner circular surface of the conductive copper ring (305).

2. The electroplastic drawing device for high-carbon steel wire as described in claim 1, characterized in that: The metal support plate (1) is provided with riveting holes. Two guide wheels (2) are riveted to the metal support plate (1) through a spindle B (7). The inner end of the spindle A (5) at the center of the conductive wheel (3) is riveted to the metal support plate (1).

3. The electroplastic drawing device for high-carbon steel wire as described in claim 1, characterized in that: A sealing ring (307) is connected to the gap between the non-metallic inner ring (301) and the non-metallic outer ring (302), and the sealing ring (307) is clamped by a clamp.

4. The electroplastic drawing device for high-carbon steel wire as described in claim 1, characterized in that: Both the non-metallic inner ring (301) and the non-metallic outer ring (302) are made of high-molecular polyurethane material, and the contact points between the rolling steel ball (304) and the non-metallic inner ring (301) and the non-metallic outer ring (302) are lubricated with grease.

5. The electroplastic drawing device for high-carbon steel wire as described in claim 1, characterized in that: The grooved outer ring (303) is made of copper, and the groove of the grooved outer ring (303) is an arc shape that fits the shape of the steel wire (9).

6. The electroplastic drawing device for high-carbon steel wire as described in claim 1, characterized in that: The outer end of the spindle A (5) is connected to two wires (6), and the other end of the two wires (6) is connected to a DC pulse power supply (4).

7. A method for electroplastic drawing of high-carbon steel wire, using the electroplastic drawing apparatus for high-carbon steel wire as described in any one of claims 1-6, characterized in that... Includes the following steps: S1. Pass the steel wire (9) with the drawing die (8) through the first guide wheel (2), the first conductive wheel (3), the second conductive wheel (3) and the second guide wheel (2) in sequence and tension it. After adjusting the position, rivet the metal support plate (1) to fix it. S2. One end of each of the two wires (6) is connected to the spindle A (5) between the two conductive wheels (3), and the other end of the two wires (6) is connected to the DC pulse power supply (4). At this time, it is necessary to make the movement direction of the steel wire (9) between the two conductive wheels (3) consistent with the current direction. S3. Turn on the DC pulse power supply (4) and adjust the duty cycle and current according to the movement speed of the steel wire (9) and the diameter of the steel wire (9).

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