Electroplastic drawing device and method suitable for high-carbon steel wire

Abstract

The invention discloses an electro-plastic drawing device suitable for a high-carbon steel wire. The electro-plastic drawing device 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 surface of the metal supporting plate at intervals; the two conductive wheels are connected to the side surface of the metal supporting plate between the two guide wheels; the conductive wheel comprises an insulated non-metal inner ring and a non-metal outer ring, the non-metal outer ring is rotatably connected to the non-metal inner ring, and a conductive groove outer ring is connected to the non-metal outer ring; a central spindle A is connected to the center of the non-metal inner ring, the inner side end of the central spindle A is insulated and connected to the metal supporting plate, the outer side end of the central spindle A is conductive and electrically communicated with the groove outer ring, and the central spindle A is connected to a direct-current pulse power source through a wire. Compared with the prior art, electronic wind power and the Joule heating effect can be generated in the steel wire, the steel wire can push 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] The invention relates to the technical field of metal forming and processing, and in particular to an electroplastic drawing device and method suitable for high-carbon steel wire. Background Art

[0002] High carbon steel cord wire is widely used as a material for steel cord products. After being drawn by traditional dies, the steel wire has higher strength due to work hardening, and can also greatly reduce the amount of steel wire and the weight of steel wire products. Therefore, it is of great significance to improve the tensile strength of steel wire. However, at the same time, the plasticity of this type of high carbon steel wire drops sharply after work hardening, which causes a series of production problems such as uneven twisting and wire breakage in the twisting of the steel cord, which ultimately affects the quality of the steel cord. At the same time, due to the increase in strength, it is easy to cause poor surface quality of the steel wire, and the risk of crack generation and expansion is also increasing.

[0003] According to metal deformation theory, metal drawing is a process in which stress drives dislocation movement. During the dislocation movement, if a certain pulse 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 dislocation and reduce the resistance to dislocation movement. The macroscopic manifestation is that the deformation resistance of the metal is reduced, so the deformation ability and plasticity of the metal are improved. At the same time, under the action of high-intensity pulse current, the stress and structure inside the steel wire will also undergo a series of changes, improving the quality of the steel wire. However, although the existing electroplastic drawing and forming devices can improve the plasticity, they are prone to frequent sparking, which seriously reduces the surface quality of the steel wire. At present, with the increasing requirements for higher strength, finer wire diameter and environmental protection of steel cords, it is urgent to develop an electroplastic drawing and forming device that can improve the plasticity and surface quality of high-strength steel wire without sparking. Summary of the invention

[0004] The purpose of the present invention is to provide an electroplastic drawing device and method suitable for high carbon steel wire, wherein a copper brush is used inside the conductive wheel to conduct electricity to ensure stable and smooth conduction. At the same time, the groove of the conductive wheel of the device is arc-shaped, which fits the shape of the steel wire and has a larger contact area. At the same time, the device can pre-tension the steel wire to further improve the stability of current conduction, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: An electroplastic drawing device suitable for high carbon steel wire comprises a metal support plate, two guide wheels, two conductive wheels and a DC pulse power supply; the guide wheels are connected to the side surfaces of the metal support plate at intervals, and the two conductive wheels are connected to the side surfaces of the metal support plate between the two guide wheels; the conductive wheel comprises an insulating non-metallic inner ring and a non-metallic outer ring, the non-metallic outer ring is rotatably connected to the non-metallic inner ring, and a conductive groove outer ring is connected to the non-metallic outer ring; a core shaft A is connected at the center of the non-metallic inner ring, the inner end of the core shaft A is insulated and connected to the metal support plate, the outer end of the core shaft A is conductive and electrically connected to the groove outer ring, and the core shaft A is connected to the DC pulse power supply through a wire.

[0006] A further solution of the present invention is that the metal support plate is provided with riveting holes according to actual needs, the two guide wheels are riveted to the metal support plate through the core shaft B, and the inner end of the core shaft A at the center of the conductive wheel is riveted to the metal support plate.

[0007] A further solution of the present invention is that the non-metallic inner ring and the non-metallic outer ring are two symmetrically arranged groups, and a group of rolling steel balls is provided between the non-metallic inner ring and the non-metallic outer ring of the same group. Each group of rolling steel balls consists of several balls arranged in a circular array, and one side of the rolling steel balls is embedded in contact with the non-metallic inner ring, and the other side is embedded in contact with the non-metallic outer ring.

[0008] A further solution of the present invention is that the groove outer ring is arranged in the middle of the two non-metallic outer rings, a conductive copper ring is connected between the two non-metallic inner rings, the inner circular surface of the groove outer ring is fixedly connected to one end of the conductive copper brush, the other end of the conductive copper brush is interference fit with the outer circular surface of the conductive copper ring, and the conductive outer end of the core shaft A is interference fit with the inner circular surface of the conductive copper ring.

[0009] A further solution 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 solution of the present invention is that the non-metallic inner ring and the non-metallic outer ring are both made of high molecular weight 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 solution of the present invention is that the outer ring of the groove is made of copper material, and the groove of the outer ring of the groove is in an arc shape that matches the shape of the steel wire.

[0012] A further solution of the present invention is that the outer ends of the core shaft A are respectively connected to two wires, and the other ends of the two wires are respectively connected to a DC pulse power supply.

[0013] An electroplastic drawing method suitable for high carbon steel wire comprises 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 them, wherein 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 the two wires is connected to the core shaft A in the middle of the two conductive wheels, and the other end of the two wires is connected to the pulse power supply. At this time, the movement direction of the steel wire between the two conductive wheels needs to be 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 wire movement speed and wire diameter.

[0014] Beneficial effects of the present invention: The electroplastic drawing device and method suitable for high carbon steel wire of the present invention can generate electronic wind force and Joule heat effect inside the steel wire. Under these two effects, the steel wire can promote dislocation movement, reduce drawing resistance, and improve the surface quality and plasticity of the steel wire.

[0015] The electroplastic drawing device and method suitable for high-carbon steel wire of the present invention can avoid the electric sparking phenomenon generated during current conduction and improve the reliability and stability of the electroplastic drawing device. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 It is the overall axonometric view of the present invention.

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

[0019] Figure 4 This is a comparison chart of the torsional performance of steel wires drawn by the conventional drawing process in Example 1 and the electroplastic drawing process of the present invention.

[0020] Figure 5 This is a comparison chart of the torsional performance of steel wires drawn by the conventional drawing process in Example 1 and the electroplastic drawing process of the present invention.

[0021] In the figure: 1-metal support plate, 2-guide wheel, 3-conductive wheel, 301-non-metal inner ring, 302-non-metal 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-conducting wire, 7-mandrel B, 8-drawing die, 9-steel wire. DETAILED DESCRIPTION

[0022] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0023] like Figures 1 to 3As shown, an electroplastic 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 connected to the side of the metal support plate 1 at intervals, 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 insulating 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 groove outer ring 303 is connected to the non-metallic outer ring 302; a core shaft A5 is connected at the center of the non-metallic inner ring 301, the inner end of the core shaft A5 is insulated and connected to the metal support plate 1, the outer end of the core shaft A5 is conductive and electrically connected to the groove outer ring 303, and the core shaft 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 according to actual needs. The two guide wheels 2 are riveted to the metal support plate 1 through the mandrel B7 , and 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 symmetrically arranged groups. A group of rolling steel balls 304 is provided between the non-metallic inner ring 301 and the non-metallic outer ring 302 in the same group. Each group of rolling steel balls 304 consists of a plurality of rolling steel balls 304 arranged in a circular array. One side of the rolling steel balls 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.

[0026] The groove outer ring 303 is arranged in the middle of 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 groove 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 fit with the outer circular surface of the conductive copper ring 305, and the conductive outer end of the core shaft A5 is interference fit 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] The non-metallic inner ring 301 and the non-metallic outer ring 302 are both made of high molecular weight 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 groove outer ring 303 is made of copper material, and the groove of the groove outer ring 303 is in an arc shape that matches the shape of the steel wire 9.

[0030] The outer ends of the core shaft A5 are respectively connected to two conductive wires 6 , and the other ends of the two conductive wires 6 are respectively connected to a DC pulse power supply 4 .

[0031] The basic principle of the present invention to realize electroplastic drawing is: the non-metallic inner ring 301, the non-metallic outer ring 302 and the rolling steel ball 304 of the conductive wheel 3 form a bearing-like structure, which plays a role in mechanical support for the conductive wheel 3. At the same time, the non-metallic inner ring 301 and the non-metallic outer ring 302 are made of high molecular polyurethane material, which is non-conductive while ensuring strength. The groove outer ring 303, the conductive copper brush 306 and the conductive copper ring 305 are all made of copper, with good conductivity. When the current passes through the copper column, it flows through the conductive copper ring 305, flows into the groove outer ring 303 through the conductive copper brush 306, and the steel wire 9 contacts the groove outer ring 303. Finally, the current enters the steel wire 9, and the pulse current plays an electroplastic drawing role on the steel wire 9. Example 1

[0032] ①. Draw the brass-plated troostite steel wire 9 with a carbon equivalent of 97C and a diameter of 1.48mm to a 0.20mmMT steel wire 9, pass the steel wire 9 through the die and adjust the lathe according to the wet drawing process card.

[0033] ②. Adjust the position of the guide wheel 2 and the conductive wheel 3 of the electroplastic drawing device. At the position of the drawing die 8, the steel wire 9 is passed through the guide wheel 2 and the conductive wheel 6 in sequence, and finally the steel wire 9 is linearly tensioned, and the drawing die 8 is located in the middle of the conductive wheel 3. After adjustment, fix the metal support plate 1.

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

[0035] ④. Set the drawing speed to 4m / s, operate the platform, and after the steel wire 9 runs at full speed, turn on the pulse power supply, in which the pulse current is 5A and the duty cycle is 50%.

[0036] ⑤. Pull out 5000m of steel wire 9. During the drawing process, the current is observed to be stable at 5A without fluctuation. The test shows that the tension of the steel wire 9 of the drawing die 8 is stable without fluctuation and there is no sparking.

[0037] ⑥. Observe the meter, turn off the pulse power after pulling is completed for 5000m, stop the machine, and the electroplastic drawing is completed.

[0038] The steel wire 9 was observed to have good surface quality and the torsion performance of the steel wire 9 was as follows: Figure 4 shown. Example 2

[0039] ①. Pull the brass-plated troostite steel wire 9 with carbon equivalent of 92C and diameter of 1.48mm to 0.20mmUT steel wire 9, pass the steel wire 9 through the mold and adjust the lathe according to the wet drawing process card.

[0040] ②. Adjust the position of the guide wheel 2 and the conductive wheel 3 of the electroplastic drawing device. At the position of the drawing die 8, the steel wire 9 is passed through the guide wheel 2 and the conductive wheel 6 in sequence, and finally the steel wire 9 is linearly tensioned, and the drawing die 8 is located in the middle of the conductive wheel 3. After adjustment, fix the metal support plate 1.

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

[0042] ④. Set the drawing speed to 6m / s, operate the platform, and after the steel wire 9 runs at full speed, turn on the pulse power supply, in which the pulse current is 5A and the duty cycle is 50%.

[0043] ⑤. Pull out 5000m of steel wire 9. During the drawing process, the current is observed to be stable at 5A without fluctuation. The test shows that the tension of the steel wire 9 of the drawing die 8 is stable without fluctuation and there is no sparking.

[0044] ⑥. Observe the meter, turn off the pulse power after pulling is completed for 5000m, stop the machine, and the electroplastic drawing is completed.

[0045] The steel wire 9 was observed to have good surface quality and the torsion performance of the steel wire 9 was as follows: Figure 5 shown.

[0046] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An electroplastic drawing device suitable for high carbon steel wire, characterized in that: The invention comprises a metal support plate (1), two guide wheels (2), two conductive wheels (3) and a direct current pulse power supply (4); the guide wheels (2) are connected to the side of the metal support plate (1) at intervals, 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) comprises an insulating 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 groove outer ring (303) is connected to the non-metallic outer ring (302); a core shaft A (5) is connected at the center of the non-metallic inner ring (301); the inner side end of the core shaft A (5) is insulated and connected to the metal support plate (1), the outer side end of the core shaft A (5) is conductive and electrically connected to the groove outer ring (303), and the core shaft A (5) is connected to the direct current pulse power supply (4) through a wire (6).

2. An electroplastic drawing device suitable for high carbon steel wire as claimed in claim 1, characterized in that: The metal support plate (1) is provided with riveting holes according to actual needs, the two guide wheels (2) are riveted to the metal support plate (1) via the mandrel B (7), and the inner end of the mandrel A (5) at the center of the conductive wheel (3) is riveted to the metal support plate (1).

3. An electroplastic drawing device suitable for high carbon steel wire as claimed in claim 1 or 2, characterized in that: The non-metallic inner ring (301) and the non-metallic outer ring (302) are two groups symmetrically arranged, and a group of rolling steel balls (304) is arranged between the non-metallic inner ring (301) and the non-metallic outer ring (302) in the same group. Each group of rolling steel balls (304) includes a plurality of rolling steel balls arranged in a ring array, and one side of the rolling steel balls (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).

4. The electroplastic drawing device for high carbon steel wire according to claim 1, characterized in that: The groove outer ring (303) is arranged in the middle of the two non-metallic outer rings (302), a conductive copper ring (305) is connected between the two non-metallic inner rings (301), the inner circumferential surface of the groove outer ring (303) is fixedly connected to one end of a conductive copper brush (306), the other end of the conductive copper brush (306) is interference-fitted with the outer circumferential surface of the conductive copper ring (305), and the conductive outer end of the core shaft A (5) is interference-fitted with the inner circumferential surface of the conductive copper ring (305).

5. An electroplastic drawing device suitable for high carbon steel wire as claimed in claim 1 or 4, 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.

6. The electroplastic drawing device for high carbon steel wire according to claim 3, characterized in that: The non-metallic inner ring (301) and the non-metallic outer ring (302) are both made of high molecular weight 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.

7. An electroplastic drawing device for high carbon steel wire as claimed in claim 1, characterized in that: The groove outer ring (303) is made of copper material, and the groove of the groove outer ring (303) is in an arc shape that matches the shape of the steel wire (9).

8. The electroplastic drawing device for high carbon steel wire according to claim 1, characterized in that: The outer ends of the core shaft A (5) are respectively connected to two wires (6), and the other ends of the two wires (6) are respectively connected to a DC pulse power supply (4).

9. An electroplastic drawing method for high carbon steel wire, using the electroplastic drawing device for high carbon steel wire as claimed in any one of claims 1 to 8, characterized in that The steps include: S1. The steel wire (9) having the drawing die (8) is passed 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 tensioned, wherein the drawing die (8) is located in the middle of the two conductive wheels (3). After the position is adjusted, the metal support plate (1) is riveted and fixed; S2, one end of the two wires (6) is connected to the core shaft A (5) in the middle of the two conductive wheels (3), and the other end of the two wires (6) is connected to the pulse power supply. At this time, the movement direction of the steel wire (9) between the two conductive wheels (3) needs to be consistent with the direction of the current; S3, turning on the pulse power supply, and adjusting the duty cycle and current according to parameters such as the moving speed of the steel wire (9) and the diameter of the steel wire (9).

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