Preparation method of silver-based strip

Abstract

The invention discloses a preparation method of a silver-based strip. The method comprises the following steps: melting and casting a silver ingot into a silver bar; rolling the silver bar into a silver wire; the silver wire rod is subjected to wire drawing in liquid nitrogen through a plurality of grinding tools, and silver wires are obtained; and rolling the silver wire into a silver strip with a target size through a precision calender. According to the method, the thin silver-based strip can be manufactured through the technological modes of vacuum continuous casting, straight rolling, low-temperature continuous drawing and wire flattening, and the method has the advantages of being short in technological process, short in consumed time, environmentally friendly, capable of saving energy, high in production efficiency and the like.

Description

Technical Field

[0001] The invention relates to the field of metallic silver preparation, and in particular to a method for preparing a silver-based strip. Background Art

[0002] High-voltage current-limiting fuses are components connected to circuits to protect them. The silver melt inside them is usually made of filaments or sheets. Pure silver strips are the most widely used high-melting-point melt materials. Silver melt has a good ability to break strong short-circuit currents. In addition, silver has stable chemical properties, excellent anti-oxidation and corrosion resistance, and its resistance value is not easy to change during use, and its melting point is constant.

[0003] At present, the processes for manufacturing silver strips include "wide plate rolling" and "silver wire flattening". The process of manufacturing silver strips by "wide plate rolling" is generally: first vacuum continuous casting of thick silver plates, then multiple rolling to the finished thickness, and finally longitudinal shearing and cutting to form. When using existing domestic processing equipment to manufacture silver strips, due to the processing accuracy of the equipment itself and the problem of transverse thickness control during the rolling process in the plate rolling field itself, only thicker strips can be manufactured. For thinner strips, the "silver wire flattening" process is generally used.

[0004] The process of "silver wire flattening" is: first vacuum continuous casting of silver-based rods, then multiple drawing to produce silver wires, and finally rolling a single wire to obtain a silver flat strip. Since the silver wire will generate a lot of heat when rubbing against the mold during high-speed drawing, coolant must be used to cool the mold. In the process of drawing, several cleaning and annealing steps must be performed to avoid wire breakage. This process is time-consuming and will also produce a lot of hazardous waste, affecting production efficiency. Summary of the invention

[0005] In view of the fact that the current "wide plate rolling" process is difficult to manufacture thinner strips, and the "silver wire flattening" process has many processes, long time consumption, generates a large amount of hazardous waste and has low production efficiency, the present invention provides a method for preparing a silver-based strip. The method can manufacture thinner silver-based strips through vacuum continuous casting, straight rolling, low-temperature continuous drawing and wire flattening. The method has the advantages of short process flow, short time consumption, green energy saving and high production efficiency.

[0006] The technical solution provided by the present invention is as follows:

[0007] A method for preparing a silver-based strip comprises the following steps:

[0008] The silver ingots were melted and cast into silver bars;

[0009] rolling the silver rod into a silver wire;

[0010] The silver wire is drawn through a plurality of grinding tools sequentially arranged along a drawing path in liquid nitrogen to obtain a silver wire, wherein the compression rate of the silver wire passing through the grinding tool is 1%-13%, the speed is 0-600 m / min, and the tension is 20-1000 g;

[0011] The silver wire is rolled into a silver strip of target size by a precision calender.

[0012] Furthermore, the silver wire is drawn in liquid nitrogen through a plurality of grinding tools sequentially arranged along a drawing path, comprising the following steps:

[0013] Arrange a plurality of grinding tools in order along the wire drawing path according to the apertures from large to small, and pass the head of the silver wire through the plurality of grinding tools in order;

[0014] Immersing the silver wire and all the abrasive tools in liquid nitrogen, and drawing the wire through a wire drawing machine;

[0015] Arrange the silver wire drawn by the wire drawing machine on the I-shaped wheel.

[0016] Furthermore, the step of melting the silver ingots and casting them into silver bars is specifically as follows:

[0017] The silver ingot is placed in a high vacuum continuous casting machine, heated to 1100-1200°C to melt the silver ingot, the guide rod is inserted into the lower grinding of the graphite crucible of the high vacuum continuous casting machine, and crystallized through a crystallizer at the lower grinding mouth of the graphite crucible. The silver rod is continuously cast downward uniformly at a constant speed, the crystallization temperature of the crystallizer is set to 60-200°C, and the diameter of the cast silver rod is 6-8mm.

[0018] Furthermore, rolling the silver rod into silver wire comprises the following steps:

[0019] The silver rod is rolled through a straight-feed rolling mill, with a compression rate of 0.5%-10% for each rolling process and a rolling speed of 0-70m / min. The compressed silver wire is extruded from the rollers of the straight-feed rolling mill. The size of the silver wire is 1.15mm*1.15mm. The silver wire is transported to a receiving tray through a traction device to achieve rolling of the silver rod;

[0020] Among them, the maximum size of the straight-in rolling mill entrance is 8.52mm*8.52mm, and each roll box has two pairs of longitudinal and transverse rolls, which are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion.

[0021] Furthermore, the silver wire is rolled into a silver strip of target size by a precision calender, specifically:

[0022] The silver wire is flattened by synchronously pressing the rollers of a precision calender up and down to obtain a silver strip of target size. The rollers of the precision calender adjust the flattening width up and down by a combination of manual and automatic methods.

[0023] Furthermore, the flattening width is monitored online in real time by a precision laser diameter meter and fed back to the controller, so that the flattening width accuracy can be corrected online in real time, ensuring that the flattening width dimensional accuracy is stable and controllable.

[0024] Furthermore, the casting speed of the silver rod is 200 mm / min.

[0025] Further, the number of the abrasive tools is 10;

[0026] The silver ribbon of the target size has a width of 1.45±0.004 mm and a thickness of 0.102±0.002 mm.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention manufactures silver-based strips through vacuum continuous casting, straight rolling, low-temperature cold drawing, and precision pressing. The process is short, green and energy-saving, and has high production efficiency. The present invention abandons the coolant cooling and drawing process, so that the production process does not generate hazardous waste (waste cooling oil). Not only is the process green and environmentally friendly, but it also reduces costs for enterprises (no need to purchase coolant, no need to deal with hazardous waste); since no cooling oil is used, there is no need to clean oil stains; silver wire is drawn under liquid nitrogen low temperature conditions, and the annealing process is abandoned. The two factors together greatly improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a schematic diagram of the process flow of the method for preparing the silver-based strip. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are part of the embodiments of the present application, not all of the embodiments.

[0031] See also Figure 1 The present invention provides a method for preparing a silver-based strip, comprising the following steps:

[0032] S1. Melt the silver ingots and cast them into silver bars.

[0033] S2. Roll the silver rod into silver wire.

[0034] S3. Drawing the silver wire through a plurality of grinding tools sequentially arranged along the drawing path in liquid nitrogen to obtain the silver wire, wherein the compression rate of the silver wire passing through the grinding tool is 1%-13%, the speed is 0-600m / min, and the tension is 20-1000g.

[0035] S4. The silver wire is rolled into a silver strip of target size by a precision calender.

[0036] The present invention adopts a process mode of low-temperature drawing of silver wire in a liquid nitrogen atmosphere, abandons the cooling oil in the traditional process, omits the oil cleaning and annealing steps, greatly reduces the process time, and significantly improves the production capacity.

[0037] Optionally, in step S3, drawing the silver wire in liquid nitrogen through a plurality of abrasive tools sequentially arranged along a drawing path comprises the following steps:

[0038] S301, multiple grinding tools are arranged in sequence along the wire drawing path according to the aperture from large to small, and the head of the silver wire is passed through multiple grinding tools in sequence. In this step, the grinding tools are arranged in sequence along the wire drawing path according to the aperture from large to small. During the wire drawing process, the head of the silver wire is first passed through the grinding tool with a large aperture, and then through the grinding tool with a small aperture, and the wire drawing is performed by the wire drawing machine. The number of grinding tools generally does not exceed 10. After the silver wire is drawn through all the grinding tools, if it cannot meet the needs, it can be repeated several times. The fewer the number of grinding tools used, the more times it is repeated. If 10 grinding tools are used, the silver wire of the required size may be obtained in one time. If 5 grinding tools are used, it will take several repetitions to obtain the same size of silver wire.

[0039] S302, immerse the silver wire and all the abrasives in liquid nitrogen, and use the wire drawing machine to draw the wire. In this step, the silver wire and all the abrasives are immersed in liquid nitrogen, and the wire drawing machine is not in liquid nitrogen. When the silver wire passes through the abrasive, the heat generated is absorbed by the liquid nitrogen, so that the silver wire does not heat up and can be taken out of the liquid nitrogen at any time.

[0040] S303, arranging the silver wire drawn by the wire drawing machine on the I-shaped wheel.

[0041] Optionally, in step S1, the silver ingot is melted and cast into a silver rod, specifically:

[0042] The silver ingot is placed in a high vacuum continuous casting machine, heated to 1100-1200°C to melt the silver ingot, the guide rod is inserted into the lower grinding of the graphite crucible of the high vacuum continuous casting machine, and crystallized through a crystallizer at the lower grinding mouth of the graphite crucible. The silver rod is continuously cast downward uniformly at a constant speed, the crystallization temperature of the crystallizer is set to 60-200°C, and the diameter of the cast silver rod is 6-8mm.

[0043] Optionally, in step S2, rolling the silver rod into silver wire comprises the following steps:

[0044] The silver rod is rolled through a straight-feed rolling mill, with a compression rate of 0.5%-10% for each rolling process and a rolling speed of 0-70m / min. The compressed silver wire is extruded from the rollers of the straight-feed rolling mill. The size of the silver wire is 1.15mm*1.15mm. The silver wire is transported to a receiving tray through a traction device to achieve rolling of the silver rod;

[0045] Among them, the maximum size of the straight-type rolling mill entrance is 8.52mm*8.52mm. There are two pairs of longitudinal and transverse rollers on each roller box. The two pairs of rollers are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion.

[0046] Optionally, in step S2, the silver wire is rolled into a silver strip of target size by a precision calender, specifically:

[0047] The silver wire is flattened by synchronously pressing the rollers of a precision calender up and down to obtain a silver strip of target size. The rollers of the precision calender adjust the flattening width up and down by a combination of manual and automatic methods.

[0048] Optionally, the flattening width can be monitored online in real time by a precision laser diameter meter and fed back to the controller, so as to realize online real-time correction of the flattening width accuracy and ensure that the flattening width dimensional accuracy is stable and controllable.

[0049] At present, the process of silver wire flattening is generally used to manufacture thinner silver strips. The process is to vacuum continuously cast silver-based rods, make silver wires by multiple drawing passes, and finally roll a single wire to obtain a silver flat strip. However, the friction between the silver wire and the mold during high-speed drawing will generate a lot of heat, and the mold must be cooled with coolant. Otherwise, the service life of the mold will be shortened or the drawing dimensional accuracy will fluctuate. In more serious cases, the mold will be directly damaged, causing certain safety hazards. In the process of drawing, in order to avoid wire breakage, the oil stains remaining on the surface of the silver wire must be cleaned. After the heat is generated by friction during the drawing process, the silver wire has a certain degree of asynchrony when cooling, and annealing must be performed to eliminate internal structural unevenness. This process is time-consuming and will also produce a large amount of hazardous waste, affecting production efficiency.

[0050] The present invention manufactures silver-based strips through vacuum continuous casting, straight rolling, low-temperature cold drawing, and precision pressing. The process is short, green and energy-saving, and has high production efficiency. The present invention abandons the coolant cooling and drawing process, so that the production process does not generate hazardous waste (waste cooling oil). Not only is the process green and environmentally friendly, but it also reduces costs for enterprises (no need to purchase coolant, no need to deal with hazardous waste); since no cooling oil is used, there is no need to clean oil stains; silver wire is drawn under liquid nitrogen low temperature conditions, and the annealing process is abandoned. The two factors together greatly improve production efficiency.

[0051] The following are specific embodiments provided for the above method.

[0052] Example 1

[0053] This embodiment provides a method for preparing a silver-based strip, comprising the following steps:

[0054] 101. Place the standard silver ingot into a high vacuum continuous casting machine, heat it to about 1180°C to melt the silver ingot, insert the stainless steel lead rod into the lower mill of the graphite crucible of the casting machine, and crystallize it through a crystallizer. Set the crystallization temperature of the crystallizer to 80°C, and continuously cast the silver rod downward uniformly at a speed of 200mm / min. The diameter of the silver rod is 8mm.

[0055] 102. The silver rod is passed through a straight-through rolling mill. Each roller box has two pairs of longitudinal and transverse rollers, which are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion, with a compression rate of 5% and a speed of 30m / min. The compression of each pass is equal. When the wire passes through the rollers, the material is pressed by the rotating rollers, and the compressed wire is squeezed out of the rollers. The size of the output wire is 1.15mm*1.15mm. Finally, the wire is transported to the receiving tray through the traction device to realize the rolling of the wire.

[0056] 103. The rolled silver wire is passed through a high-precision diamond grinder with multiple decreasing apertures. After the silver wire head passes through the diamond grinder in sequence, all the diamond grinders and the silver wire are immersed in liquid nitrogen and drawn with a wire drawing machine. The silver wire is then arranged on the I-shaped wheel through a wire-taking servo precision module, with the compression rate set to 6%, the speed to 300m / min, the tension to 300g, and the wire diameter to 0.45mm.

[0057] 104. The round wire is flattened by using a precision alloy roller with synchronous pressure from top to bottom, and the silver wire is rolled into a silver strip of target size through a precision calender. After testing the silver strip, the width is 1.45±0.005mm, the thickness is 0.102±0.002mm, and the resistance per meter is 110±5mΩ·m.

[0058] Example 2

[0059] This embodiment provides a method for preparing a silver-based strip, comprising the following steps:

[0060] 201. Put the standard silver ingot into a high vacuum continuous casting machine, heat it to about 1180℃ to melt the silver ingot, insert the special stainless steel guide rod into the lower mill of the graphite crucible of the casting machine, and crystallize it through a crystallizer. Set the crystallization temperature of the crystallizer to 100℃, and cast the silver rod downward evenly at a speed of 200mm / min. The diameter of the silver rod is 8mm.

[0061] 202. The silver rod is passed through a straight-through rolling mill. Each roller box has two pairs of longitudinal and transverse rollers, which are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion, with a compression rate of 5% and a speed of 30m / min. The compression of each pass is equal. When the wire passes through the rollers, the material is pressed by the rotating rollers, and the compressed wire is squeezed out of the rollers. The size of the output wire is 1.15mm*1.15mm. Finally, the wire is transported to the receiving tray through the traction device to realize the rolling of the wire.

[0062] 203. The rolled silver wire is drawn by a wire drawing machine through multiple high-precision diamond grinders. After the head of the silver wire passes through the diamond grinder, the diamond grinder and the silver wire are immersed in liquid nitrogen. The silver wire is then arranged in the I-shaped wheel through the wire-taking servo precision module. The compression rate is set to 6%, the speed is 300m / min, the tension is 300g, and the wire diameter is 0.45mm.

[0063] 204. The round wire is flattened by using a precision alloy roller with synchronous pressure from top to bottom, and the silver wire is rolled into a silver strip of target size by a precision calender. After testing the silver strip, the width is 1.45±0.005mm, the thickness is 0.102±0.002mm, and the resistance per meter is 110±5mΩ·m.

[0064] Example 3

[0065] This embodiment provides a method for preparing a silver-based strip, comprising the following steps:

[0066] 301. Place the standard silver ingot into a high vacuum continuous casting machine, heat it to about 1180°C to melt the silver ingot, insert the special stainless steel guide rod into the lower mill of the graphite crucible of the casting machine, set the crystallization temperature of the crystallizer to 80°C, and continuously cast the silver rod downward at a uniform speed of 200mm / min. The diameter of the silver rod is 8mm.

[0067] 302. The silver rod is passed through a straight-through rolling mill. Each roller box has two pairs of longitudinal and transverse rollers, which are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion, with a compression rate of 1% and a speed of 30m / min. The compression of each pass is equal. When the wire passes through the rollers, the material is pressed by the rotating rollers, and the compressed wire is squeezed out of the rollers. The size of the output wire is 1.15mm*1.15mm. Finally, the wire is transported to the receiving tray through the traction device to realize the rolling of the wire.

[0068] 303. The rolled silver wire is drawn by a wire drawing machine through multiple high-precision diamond grinders. After the head of the silver wire passes through the diamond grinder, the diamond grinder and the silver wire are immersed in liquid nitrogen. Then the silver wire is arranged in the I-shaped wheel through the wire-taking servo precision module, with a compression rate of 6%, a speed of 300m / min, a tension of 300g, and a wire diameter of 0.45mm.

[0069] 304. The round wire is flattened by using a precision alloy roller with synchronous pressure from top to bottom, and the silver wire is rolled into a silver strip of target size through a precision calender. After testing the silver strip, the width is 1.45±0.004mm, the thickness is 0.102±0.002mm, and the resistance per meter is 106±4mΩ·m.

[0070] Example 4

[0071] This embodiment provides a method for preparing a silver-based strip, comprising the following steps:

[0072] 401. Place the standard silver ingot into a high vacuum continuous casting machine, heat it to about 1180°C to melt the silver ingot, insert the special stainless steel guide rod into the lower mill of the graphite crucible of the casting machine, set the crystallization temperature of the crystallizer to 80°C, and continuously cast the silver rod downward evenly at a speed of 200mm / min. The diameter of the silver rod is 8mm.

[0073] 402. The silver rod is passed through a straight-through rolling mill. Each roller box has two pairs of longitudinal and transverse rollers, which are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion, with a compression rate of 8% and a speed of 30m / min. The compression of each pass is equal. When the wire passes through the rollers, the material is pressed by the rotating rollers, and the compressed wire is squeezed out of the rollers. The size of the output wire is 1.15mm*1.15mm. Finally, the wire is transported to the receiving tray through the traction device to realize the rolling of the wire.

[0074] 403. The rolled silver wire is drawn by a wire drawing machine through multiple high-precision diamond grinders. After the head of the silver wire passes through the diamond grinder, the diamond grinder and the silver wire are immersed in liquid nitrogen. The silver wire is then arranged in the I-shaped wheel through the wire-taking servo precision module, with a compression rate of 6%, a speed of 300m / min, a tension of 300g, and a wire diameter of 0.45mm.

[0075] 404. The round wire is flattened by using a precision alloy roller with synchronous pressure from top to bottom, and the silver wire is rolled into a silver strip of target size through a precision calender. After testing the silver strip, the width is 1.45±0.004mm, the thickness is 0.102±0.002mm, and the resistance per meter is 112±5mΩ·m.

[0076] Example 5

[0077] This embodiment provides a method for preparing a silver-based strip, comprising the following steps:

[0078] 501. Place the standard silver ingot into a high vacuum continuous casting machine, heat it to about 1180°C to melt the silver ingot, insert the special stainless steel guide rod into the lower mill of the graphite crucible of the casting machine, set the crystallization temperature of the crystallizer to 80°C, and continuously cast the silver rod downward at a uniform speed of 200mm / min. The diameter of the silver rod is 8mm.

[0079] 502. The silver rod is passed through a straight-through rolling mill. Each roller box has two pairs of longitudinal and transverse rollers, which are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion, with a compression rate of 5% and a speed of 10m / min. The compression of each pass is equal. When the wire passes through the rollers, the material is pressed by the rotating rollers, and the compressed wire is squeezed out of the rollers. The size of the output wire is 1.15mm*1.15mm. Finally, the wire is transported to the receiving tray through the traction device to realize the rolling of the wire.

[0080] 503. The rolled silver wire is drawn by a wire drawing machine through multiple high-precision diamond grinders. After the head of the silver wire passes through the diamond grinder, the diamond grinder and the silver wire are immersed in liquid nitrogen. Then the silver wire is arranged in the I-shaped wheel through the wire-taking servo precision module, with a compression rate of 6%, a speed of 300m / min, a tension of 300g, and a wire diameter of 0.45mm.

[0081] 504. The round wire is flattened by using a precision alloy roller with synchronous pressure from top to bottom, and the silver wire is rolled into a silver strip of target size through a precision calender. After testing the silver strip, the width is 1.45±0.003mm, the thickness is 0.102±0.002mm, and the resistance per meter is 108±3mΩ·m.

[0082] Example 6

[0083] This embodiment provides a method for preparing a silver-based strip, comprising the following steps:

[0084] 601. Place the standard silver ingot into a high vacuum continuous casting machine, heat it to about 1180°C to melt the silver ingot, insert the special stainless steel guide rod into the lower mill of the graphite crucible of the casting machine, set the crystallization temperature of the crystallizer to 80°C, and continuously cast the silver rod downward at a uniform speed of 200mm / min. The diameter of the silver rod is 8mm.

[0085] 602. The silver rod is passed through a straight-through rolling mill. Each roller box has two pairs of longitudinal and transverse rollers, which are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion, with a compression rate of 5% and a speed of 60m / min. The compression of each pass is equal. When the wire passes through the rollers, the material is pressed by the rotating rollers, and the compressed wire is squeezed out of the rollers. The size of the output wire is 1.15mm*1.15mm. Finally, the wire is transported to the receiving tray through the traction device to realize the rolling of the wire.

[0086] 603. The rolled silver wire is drawn by a wire drawing machine through multiple high-precision diamond grinders. After the head of the silver wire passes through the diamond grinder, the diamond grinder and the silver wire are immersed in liquid nitrogen. Then the silver wire is arranged in the I-shaped wheel through the wire-taking servo precision module, with a compression rate of 6%, a speed of 300m / min, a tension of 300g, and a wire diameter of 0.45mm.

[0087] 604. The round wire is flattened by using precision alloy rollers with synchronous pressure from top to bottom, and the silver wire is rolled into a silver strip of target size through a precision calender. After testing the silver strip, the width is 1.45±0.005mm, the thickness is 0.102±0.002mm, and the resistance per meter is 111±4mΩ·m.

[0088] Example 7

[0089] This embodiment provides a method for preparing a silver-based strip, comprising the following steps:

[0090] 701. Place the standard silver ingot into a high vacuum continuous casting machine, heat it to about 1180°C to melt the silver ingot, insert the special stainless steel guide rod into the lower mill of the graphite crucible of the casting machine, set the crystallization temperature of the crystallizer to 80°C, and continuously cast the silver rod downward at a uniform speed of 200mm / min. The diameter of the silver rod is 8mm.

[0091] 701. The silver rod is passed through a straight-through rolling mill. Each roller box has two pairs of longitudinal and transverse rollers, which are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion, with a compression rate of 5% and a speed of 30m / min. The compression of each pass is equal. When the wire passes through the rollers, the material is pressed by the rotating rollers, and the compressed wire is squeezed out of the rollers. The size of the output wire is 1.15mm*1.15mm. Finally, the wire is transported to the receiving tray through the traction device to realize the rolling of the wire.

[0092] 703. The rolled silver wire is drawn by a wire drawing machine through multiple high-precision diamond grinders. After the head of the silver wire passes through the diamond grinder, the diamond grinder and the silver wire are immersed in liquid nitrogen. Then the silver wire is arranged in the I-shaped wheel through the wire-taking servo precision module, with a compression rate of 3%, a speed of 300m / min, a tension of 300g, and a wire diameter of 0.45mm.

[0093] 704. The round wire is flattened by using precision alloy rollers to press synchronously up and down, and the silver wire is rolled into a silver strip of target size through a precision calender. After testing the silver strip, the width is 1.45±0.004mm, the thickness is 0.102±0.002mm, and the resistance per meter is 104±3mΩ·m.

[0094] Example 8

[0095] This embodiment provides a method for preparing a silver-based strip, comprising the following steps:

[0096] 801. Place the standard silver ingot into a high vacuum continuous casting machine, heat it to about 1180°C to melt the silver ingot, insert the special stainless steel guide rod into the lower mill of the graphite crucible of the casting machine, set the crystallization temperature of the crystallizer to 80°C, and continuously cast the silver rod downward at a uniform speed of 200mm / min. The diameter of the silver rod is 8mm.

[0097] 802. The silver rod is passed through a straight-through rolling mill. Each roller box has two pairs of longitudinal and transverse rollers, which are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion, with a compression rate of 5% and a speed of 30m / min. The compression of each pass is equal. When the wire passes through the rollers, the material is pressed by the rotating rollers, and the compressed wire is squeezed out of the rollers. The size of the output wire is 1.15mm*1.15mm. Finally, the wire is transported to the receiving tray through the traction device to realize the rolling of the wire.

[0098] 803. The rolled silver wire is drawn by a wire drawing machine through multiple high-precision diamond grinders. After the head of the silver wire passes through the diamond grinder, the diamond grinder and the silver wire are immersed in liquid nitrogen. The silver wire is then arranged in the I-shaped wheel through the wire-taking servo precision module, with a compression rate of 10%, a speed of 300m / min, a tension of 300g, and a wire diameter of 0.45mm.

[0099] 804. The round wire is flattened by using a precision alloy roller with synchronous pressure from top to bottom, and the silver wire is rolled into a silver strip of target size through a precision calender. After testing the silver strip, the width is 1.45±0.005mm, the thickness is 0.102±0.002mm, and the resistance per meter is 109±4mΩ·m.

[0100] Example 9

[0101] This embodiment provides a method for preparing a silver-based strip, comprising the following steps:

[0102] 901. Place the standard silver ingot into a high vacuum continuous casting machine, heat it to about 1180°C to melt the silver ingot, insert the special stainless steel guide rod into the lower mill of the graphite crucible of the casting machine, set the crystallization temperature of the crystallizer to 80°C, and continuously cast the silver rod downward at a uniform speed of 200mm / min. The diameter of the silver rod is 8mm.

[0103] 902. The silver rod is passed through a straight-through rolling mill. Each roller box has two pairs of longitudinal and transverse rollers, which are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion, with a compression rate of 5% and a speed of 30m / min. The compression of each pass is equal. When the wire passes through the rollers, the material is pressed by the rotating rollers, and the compressed wire is squeezed out of the rollers. The size of the output wire is 1.15mm*1.15mm. Finally, the wire is transported to the receiving tray through the traction device to realize the rolling of the wire.

[0104] 903. The rolled silver wire is drawn by a wire drawing machine through multiple high-precision diamond grinders. After the head of the silver wire passes through the diamond grinder, the diamond grinder and the silver wire are immersed in liquid nitrogen. Then the silver wire is arranged in the I-shaped wheel through the wire-taking servo precision module, with a compression rate of 3%, a speed of 100m / min, a tension of 300g, and a wire diameter of 0.45mm.

[0105] 904. The round wire is flattened by using a precision alloy roller with synchronous pressure from top to bottom, and the silver wire is rolled into a silver strip of target size through a precision calender. After testing the silver strip, the width is 1.45±0.004mm, the thickness is 0.102±0.002mm, and the resistance per meter is 103±5mΩ·m.

[0106] Example 10

[0107] This embodiment provides a method for preparing a silver-based strip, comprising the following steps:

[0108] 1001. Place the standard silver ingot into a high vacuum continuous casting machine, heat it to about 1180°C to melt the silver ingot, insert the special stainless steel guide rod into the lower mill of the graphite crucible of the casting machine, set the crystallization temperature of the crystallizer to 80°C, and continuously cast the silver rod downward evenly at a speed of 200mm / min. The diameter of the silver rod is 8mm.

[0109] 1002. The silver rod is passed through a straight-through rolling mill. Each roller box has two pairs of longitudinal and transverse rollers, which are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion, with a compression rate of 5% and a speed of 30m / min. The compression of each pass is equal. When the wire passes through the rollers, the material is pressed by the rotating rollers, and the compressed wire is squeezed out of the rollers. The size of the output wire is 1.15mm*1.15mm. Finally, the wire is transported to the receiving tray through the traction device to realize the rolling of the wire.

[0110] 1003. The rolled silver wire is drawn by a wire drawing machine through multiple high-precision diamond grinders. After the head of the silver wire passes through the diamond grinder, the diamond grinder and the silver wire are immersed in liquid nitrogen. The silver wire is then arranged in the I-shaped wheel through the wire-taking servo precision module, with a compression rate of 3%, a speed of 300m / min, a tension of 800g, and a wire diameter of 0.45mm.

[0111] 1004. The round wire is flattened by using precision alloy rollers to press synchronously up and down, and the silver wire is rolled into a silver strip of target size through a precision calender. After testing the silver strip, the width is 1.45±0.004mm, the thickness is 0.102±0.002mm, and the resistance per meter is 104±2mΩ·m.

[0112] The above is only the best specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for preparing a silver-based strip, characterized in that: The following steps are involved: The silver ingots were melted and cast into silver bars; rolling the silver rod into a silver wire; The silver wire is drawn through a plurality of grinding tools sequentially arranged along a drawing path in liquid nitrogen to obtain a silver wire, wherein the compression rate of the silver wire passing through the grinding tool is 1%-13%, the speed is 0-600 m / min, and the tension is 20-1000 g; The silver wire is rolled into a silver strip of target size by a precision calender.

2. The method for preparing a silver-based strip according to claim 1, wherein the silver wire is drawn in liquid nitrogen through a plurality of abrasive tools sequentially arranged along a drawing path, wherein: The following steps are involved: Arrange a plurality of grinding tools in order along the wire drawing path according to the apertures from large to small, and pass the head of the silver wire through the plurality of grinding tools in order; Immersing the silver wire and all the abrasive tools in liquid nitrogen, and drawing the wire through a wire drawing machine; Arrange the silver wire drawn by the wire drawing machine on the I-shaped wheel.

3. The method for preparing a silver-based strip according to claim 1, wherein the silver ingot is melted and cast into a silver rod, characterized in that: Specifically: The silver ingot is placed in a high vacuum continuous casting machine, heated to 1100-1200°C to melt the silver ingot, the guide rod is inserted into the lower grinding of the graphite crucible of the high vacuum continuous casting machine, and crystallized through a crystallizer at the lower grinding mouth of the graphite crucible. The silver rod is continuously cast downward uniformly at a constant speed, the crystallization temperature of the crystallizer is set to 60-200°C, and the diameter of the cast silver rod is 6-8mm.

4. The method for preparing a silver-based strip according to claim 1, wherein the silver rod is rolled into a silver wire, characterized in that: The following steps are involved: The silver rod is rolled through a straight-feed rolling mill, with a compression rate of 0.5%-10% for each rolling process and a rolling speed of 0-70m / min. The compressed silver wire is extruded from the rollers of the straight-feed rolling mill. The size of the silver wire is 1.15mm*1.15mm. The silver wire is transported to a receiving tray through a traction device to achieve rolling of the silver rod; Among them, the maximum size of the straight-in rolling mill entrance is 8.52mm*8.52mm, and each roll box has two pairs of longitudinal and transverse rolls, which are distributed horizontally and vertically respectively. The wire diameter after rolling is gradually reduced in proportion.

5. The method for preparing a silver-based strip according to claim 1, wherein the silver wire is rolled into a silver strip of a target size by a precision calender, wherein: Specifically: The silver wire is flattened by synchronously pressing the rollers of a precision calender up and down to obtain a silver strip of target size. The rollers of the precision calender adjust the flattening width up and down by a combination of manual and automatic methods.

6. The method for preparing the silver-based strip according to claim 5, characterized in that: The flattening width is monitored online in real time by a precision laser diameter gauge and fed back to the controller, so that the flattening width accuracy can be corrected online in real time to ensure that the flattening width dimensional accuracy is stable and controllable.

7. The method for preparing the silver-based strip according to claim 3, characterized in that: The casting speed of the silver rod is 200 mm / min.

8. The method for preparing a silver-based strip according to any one of claims 1 to 7, characterized in that: The number of the abrasive tools is 10; The silver ribbon of the target size has a width of 1.45±0.004 mm and a thickness of 0.102±0.002 mm.

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