Manufacturing process of stainless steel cathode plate and stainless steel cathode plate

Abstract

The invention relates to the technical field of cathode plate manufacturing, in particular to a stainless steel cathode plate manufacturing process and a stainless steel cathode plate, the stainless steel cathode plate manufacturing process comprises the steps that a limiting groove is machined in the bottom of a conductive rod, then a stainless steel plate is embedded into the limiting groove, double-face full welding is conducted through laser welding, and the welding parameters are as follows: the scanning speed is 100-500 mm / s; the scanning width is 1 mm to 5 mm; the peak power is 800 W to 2000 W; the duty ratio is 100%; the pulse frequency ranges from 1,500 Hz to 3,000 Hz; and the wire outlet speed is 60 cm / min to 100 cm / min. According to the manufacturing process of the stainless steel negative plate and the stainless steel negative plate, by optimizing welding parameters and the process, the welding seam performance of the conductive rod and the stainless steel plate can be guaranteed, so that the physical performance of the manufactured stainless steel negative plate is not inferior to that of the stainless steel negative plate manufactured through sleeve welding; and the interface resistance can be obviously reduced, so that the electric energy loss is reduced, the stainless steel negative plate is lightweight, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cathode plate manufacturing, and particularly to a manufacturing process of a stainless steel cathode plate and a stainless steel cathode plate. Background Art

[0002] The stainless steel cathode plate uses a stainless steel plate as a reusable cathode deposition surface to precipitate high-purity plate-shaped cathode copper, and is one of the main process equipment for copper smelting and copper resource recovery. The stainless steel cathode plate is composed of a conductive rod, a stainless steel plate, and an insulating edge strip.

[0003] In the prior art, due to the difficulty in welding copper-steel dissimilar materials, the cost is too high, and the weld performance and the electrical conductivity of the stainless steel cathode plate are not good after welding. Therefore, when manufacturing the stainless steel cathode plate, a method is adopted in which pure copper is embedded in a stainless steel sleeve, and then the sleeve is welded to the stainless steel plate. However, when the stainless steel cathode plate manufactured by welding with a sleeve is in use, the current needs to pass through the copper-sleeve contact surface, resulting in an increase in contact resistance. And increasing the stainless steel sleeve will significantly increase the product weight and production cost. In view of this, we propose a manufacturing process of a stainless steel cathode plate and a stainless steel cathode plate. Summary of the Invention

[0004] An object of an embodiment of the present invention is to provide a manufacturing process of a stainless steel cathode plate and a stainless steel cathode plate, which solve the problems in the prior art that the stainless steel cathode plate is welded with a sleeve, resulting in an increase in contact resistance, an increase in product weight, and too high production cost.

[0005] To achieve the above object, the first aspect of the present invention provides a manufacturing process of a stainless steel cathode plate, including processing a limiting groove at the bottom of the conductive rod, then embedding the stainless steel plate into the limiting groove, and performing double-sided full welding by laser welding. The welding parameters are as follows:

[0006] Scanning speed: 100 mm / s - 500 mm / s;

[0007] Scanning width: 1 mm - 5 mm;

[0008] Peak power: 800 W - 2000 W;

[0009] Duty cycle: 100%;

[0010] Pulse frequency: 1500 Hz - 3000 Hz;

[0011] Wire feeding speed: 60 cm / min - 100 cm / min.

[0012] Preferably, the depth of the limiting groove is 1 mm - 5 mm, and the width of the groove is not less than the thickness of the stainless steel plate.

[0013] Preferably, the conductive bar is made of T2 copper bar, and the processing requirements of the conductive bar are as follows:

[0014] The straightness is < 1 mm / m, and the cross-sectional dimension tolerance is ±0.15 mm.

[0015] Preferably, the stainless steel plate is made of 316L stainless steel, and the processing requirements of the stainless steel plate are as follows:

[0016] The length and width tolerance is ±1 mm, the diagonal error ≤ 2 mm, the thickness tolerance is ±0.08 mm, and the surface roughness is 0.25 μm - 0.6 μm.

[0017] Preferably, it further includes the step of cutting hoisting holes on the stainless steel plate before welding.

[0018] Preferably, it further includes the step of milling a V-shaped groove on the bottom edge of the stainless steel plate before welding, and the groove depth of the V-shaped groove is 1.1 mm - 1.3 mm.

[0019] Preferably, it further includes the step of leveling the stainless steel plate before welding, and the flatness of the stainless steel plate after leveling is ≤ 3 mm.

[0020] Preferably, insulating clamping edge strips are installed on both sides of the stainless steel plate after welding.

[0021] In the second aspect of the embodiments of the present invention, a stainless steel cathode plate is provided, and the stainless steel cathode plate is made by the manufacturing process of the stainless steel cathode plate described above.

[0022] By means of the above technical solutions, the present invention provides a manufacturing process of a stainless steel cathode plate and the stainless steel cathode plate. It has at least the following beneficial effects:

[0023] The manufacturing process of the stainless steel cathode plate and the stainless steel cathode plate can ensure the weld performance of the conductive bar and the stainless steel plate by optimizing the welding parameters and processes, so that the physical properties of the obtained stainless steel cathode plate are not inferior to those of the stainless steel cathode plate made by sleeve welding. In addition, since the conductive bar and the stainless steel plate are directly welded, the interface resistance can be significantly reduced, thereby reducing the power consumption. At the same time, the stainless steel cathode plate is made lightweight, reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0025] Figure 1 It is a three-dimensional view of the conductive bar and the stainless steel plate in the embodiments of the present invention;

[0026] Figure 2 It is a sectional view of the conductive bar and the stainless steel plate in the embodiments of the present invention;

[0027] Figure 3 This is a schematic diagram of the insulating clamping strip in the embodiment of the present invention.

[0028] In the figure: 1, conductive rod; 101, limiting groove; 2, stainless steel plate; 201, lifting hole; 202, V-shaped groove; 3, insulating clamping strip. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] A manufacturing process for a stainless steel cathode plate includes the following steps:

[0031] 1. Selection of raw materials

[0032] 1.1. T2 cathode copper, where the Cu content ≥ 99.9%;

[0033] 1.2. 316L stainless steel, with the surface roughness requirement reaching 2B, that is, 0.25 μm - 0.6 μm.

[0034] 2. Manufacturing of the stainless steel plate 2

[0035] 2.1. Cut the 316L stainless steel into a stainless steel plate 2 with specified dimensions, with the length and width tolerance of ±1 mm, the diagonal error requirement ≤ 2 mm, and the thickness tolerance of ±0.08 mm;

[0036] 2.2. Cut out the lifting hole 201 on the stainless steel plate 2;

[0037] 2.3. Mill a V-shaped groove 202 at the bottom of the stainless steel plate 2, with the groove depth of 1.1 mm - 1.3 mm;

[0038] 2.4. Level the processed stainless steel plate 2 to make the flatness of the plate surface ≤ 3 mm;

[0039] 3. Manufacturing of the conductive rod 1

[0040] 3.1. According to the requirements of the drawing, process the T2 copper bar into a conductive rod 1 with specified dimensions, with the straightness < 1 mm / m and the cross-sectional dimension tolerance of the conductive rod 1 of ±0.15 mm;

[0041] 3.2. Process a limit groove 101 at the bottom of the conductive rod to fix the position of the stainless-steel plate 2 for better welding. The depth of the limit groove 101 is 1 mm - 5 mm, and the width of the groove is not less than the thickness of the stainless-steel plate 2.

[0042] 4. Welding

[0043] Insert the conductive rod into the fixture, embed the stainless-steel plate into the limit groove 101 on the conductive rod 1, and perform double-sided full welding with laser welding;

[0044] The welding parameter range is as follows:

[0045] Scanning speed: 100 mm / s - 500 mm / s

[0046] Scanning width: 1 mm - 5 mm

[0047] Peak power: 800 W - 2000 W

[0048] Duty cycle: 100%

[0049] Pulse frequency: 1500 Hz - 3000 Hz

[0050] Wire feeding speed: 60 cm / min - 100 cm / min.

[0051] 5. After welding, install insulating edge strips 3 on both sides of the stainless-steel plate 2.

[0052] 6. Mounting on the rack.

[0053] The manufacturing process of the stainless-steel cathode plate will be described below in conjunction with specific embodiments.

[0054] Embodiment 1

[0055] Please refer to Figures 1 - 3 , a manufacturing process of a stainless-steel cathode plate provided in this embodiment includes the following steps:

[0056] 1. Selection of raw materials

[0057] 1.1. T2 cathode copper, where the Cu content ≥ 99.9%;

[0058] 1.2. 316L stainless-steel material, and the surface roughness requirement reaches 2B.

[0059] 2. Manufacture of the stainless-steel plate 2

[0060] 2.1. Cut the 316L stainless-steel material into stainless-steel plates 2 with specified dimensions. The length of the stainless-steel plate 2 is 1105 mm, the width is 1036 mm, and the thickness is 3.25 mm;

[0061] 2.2. Cut out the lifting holes 201 on the stainless-steel plate 2;

[0062] 2.3. Mill a V-shaped groove 202 at the bottom edge of the stainless steel plate 2, with a groove depth of 1.1 mm;

[0063] 2.4. Level the processed stainless steel plate 2 so that the flatness of the plate surface is 3 mm;

[0064] 3. Fabrication of the conductive bar 1

[0065] 3.1. According to the drawing requirements, process the T2 copper bar into a conductive bar 1 with specified dimensions. The length of the conductive bar 1 is 1290 mm, the width is 43 mm, and the thickness is 24 mm. The straightness requirement is 0.8 mm / m;

[0066] 3.2. Machine a limit groove 101 at the bottom of the conductive bar to fix the position of the stainless steel plate 2 for better welding. The groove depth of the limit groove 101 is 5 mm, and the groove width is 3.25 mm.

[0067] 4. Welding

[0068] Insert the conductive bar into the fixture, and insert the stainless steel plate 2 into the limit groove 101 on the conductive bar 1 to achieve an interference fit between the stainless steel plate 2 and the limit groove 101. Perform double-sided full welding with a laser welder;

[0069] The welding parameters are as follows:

[0070] Scanning speed: 500 mm / s;

[0071] Scanning width: 5 mm;

[0072] Peak power: 2000 W;

[0073] Pulse frequency: 3000 Hz;

[0074] Wire feeding speed: 100 cm / min.

[0075] 5. Install insulating edge strips 3 on both sides of the stainless steel plate 2 after welding

[0076] 6. Mounting on the rack.

[0077] Example 2

[0078] The difference from Example 1 is only that the groove depth of the limit groove 101 is 3 mm, and the welding parameters are as follows:

[0079] Scanning speed: 300 mm / s;

[0080] Scanning width: 3 mm;

[0081] Peak power: 1400 W;

[0082] Pulse frequency: 2000 Hz;

[0083] Wire feeding speed: 80 cm / min.

[0084] Example 3

[0085] The difference from Example 1 is only that the groove depth of the limit groove 101 is 1 mm, and the welding parameters are

[0086] Scanning speed: 100 mm / s;

[0087] Scanning width: 1 mm;

[0088] Peak power: 800 W;

[0089] Duty cycle: 100%;

[0090] Pulse frequency: 1500 Hz;

[0091] Wire feeding speed: 60 cm / min.

[0092] Comparative Example 1

[0093] The difference from Example 1 is only that in the welding step, a structural stainless steel sleeve is added. First, the conductive rod 1 is inserted into the stainless steel sleeve, and then the stainless steel sleeve is welded to the stainless steel plate 2.

[0094] Comparative Example 2

[0095] The difference from Example 2 is only that in the welding step, a structural stainless steel sleeve is added. First, the conductive rod 1 is inserted into the stainless steel sleeve, and then the stainless steel sleeve is welded to the stainless steel plate 2.

[0096] Comparative Example 3

[0097] The difference from Example 3 is only that in the welding step, a structural stainless steel sleeve is added. First, the conductive rod 1 is inserted into the stainless steel sleeve, and then the stainless steel sleeve is welded to the stainless steel plate 2.

[0098] The performance of the stainless steel cathode plates prepared under the conditions of Examples 1 - 3 and Comparative Examples 1 - 3 was detected.

[0099] Table 1: Weld performance test table

[0100]

[0101]

[0102] Table 2: Electrical performance test table of stainless steel plate cathode plates

[0103] Interface resistance / μΩ·m <![CDATA[Upper limit of current density / A / m 2 > <![CDATA[Power loss / kW / m 2 > Example 1 0.22 12900 1.72 Example 2 0.25 12000 1.79 Example 3 0.31 11500 1.83 Comparative Example 1 0.65 6000 5.22 Comparative Example 2 0.69 5500 4.97 Comparative Example 3 0.73 4700 4.65

[0104] As can be seen from Table 1, the welding parameters have an impact on all properties of the weld. Under the specified welding parameters, directly welding the conductive rod 1 to the stainless-steel plate 2 can obtain a stainless-steel cathode plate with better weld properties than that obtained by the method of welding with a stainless-steel sleeve in the prior art.

[0105] As can be seen from Table 2, under the specified welding parameters, directly welding the conductive rod 1 to the stainless-steel plate 2 can significantly reduce the cross-sectional resistance and power loss of the stainless-steel cathode plate, and increase the upper limit of the current density of the stainless-steel cathode plate. The reason is that the stainless-steel sleeve will increase the current contact resistance and heat loss, while the direct welding method can ensure the interface continuity between the conductive rod 1 and the stainless-steel plate 2 and avoid the problem of current concentration. Therefore, for the stainless-steel cathode plates prepared under the welding parameters of Examples 1-3, the conductive efficiency can be significantly improved.

[0106] In addition, the method of directly welding the conductive rod 1 to the stainless-steel plate 2 can greatly reduce the weight of the stainless-steel cathode plate and save production costs. Moreover, the direct welding method can eliminate the gap between the stainless-steel sleeve and the conductive rod 1 that may exist in the traditional method, avoid the infiltration of the electrolyte, and improve the corrosion resistance of the stainless-steel cathode plate.

[0107] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0108] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A manufacturing process for a stainless steel cathode plate, characterized in that, It includes processing a limit groove (101) at the bottom of the conductive bar (1), then embedding the stainless-steel plate (2) into the limit groove (101), and performing double-sided full welding with laser welding. The welding parameters are as follows: Scanning speed: 100 mm / s - 500 mm / s; Scanning width: 1 mm - 5 mm; Peak power: 800 W - 2000 W; Duty cycle: 100%; Pulse frequency: 1500 Hz - 3000 Hz; Wire feeding speed: 60 cm / min - 100 cm / min.

2. The manufacturing process of the stainless steel cathode plate according to claim 1, characterized in that, The depth of the limit groove (101) is 1 mm - 5 mm, and the width of the groove is not less than the thickness of the stainless-steel plate (2).

3. The manufacturing process of the stainless steel cathode plate according to claim 1, characterized in that, The conductive bar (1) is made of T2 copper bar, and the processing requirements of the conductive bar (1) are as follows: Straightness < 1 mm / m, and the cross-sectional dimension tolerance is ±0.15 mm.

4. The manufacturing process of the stainless steel cathode plate according to claim 1, characterized in that, The stainless-steel plate (2) is made of 316L stainless steel, and the processing requirements of the stainless-steel plate (2) are as follows: Length and width tolerance: ±1 mm, diagonal error ≤ 2 mm, thickness tolerance: ±0.08 mm, surface roughness: 0.25 μm - 0.6 μm.

5. The manufacturing process of the stainless steel cathode plate according to claim 1, characterized in that, It also includes the step of cutting a lifting hole (201) on the stainless-steel plate (2) before welding.

6. The manufacturing process of the stainless steel cathode plate according to claim 1, characterized in that, It also includes the step of milling a V-shaped groove (202) on the bottom edge of the stainless-steel plate (2) before welding. The depth of the V-shaped groove (202) is 1.1 mm - 1.3 mm.

7. The manufacturing process of the stainless steel cathode plate according to claim 1, characterized in that, It also includes the step of leveling the stainless-steel plate (2) before welding. After leveling, the flatness of the plate surface of the stainless-steel plate (2) ≤ 3 mm.

8. The manufacturing process of the stainless steel cathode plate according to claim 1, characterized in that, After welding, insulating clamping edge strips (3) are installed on both sides of the stainless-steel plate (2).

9. A stainless steel cathode plate, characterized in that, The stainless-steel cathode plate is made by the manufacturing process of the stainless-steel cathode plate according to any one of claims 1 - 8.

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