Preparation process of stainless steel microfilament for silk-screen printing of photovoltaic cell

Abstract

The invention relates to a preparation process of a stainless steel microwire for photovoltaic cell screen printing, which comprises the following steps: S1, raw material selection: selecting a stainless steel wire with the diameter of 1mm and the mark of 304N as a raw material; s2, water tank machine rough drawing is conducted, specifically, the stainless steel wire with the diameter of 1 mm and the mark of 304N prepared in the step S1 is drawn to the diameter of 0.030 mm; s3, stainless steel wire annealing, wherein the stainless steel wire drawn in the S2 is subjected to annealing treatment; s4, drawing in a water tank machine: drawing the annealed stainless steel wire until the diameter is 0.18 mm; and S5, non-slip machine wet drawing is conducted, specifically, the stainless steel wire treated in the step S4 is drawn to 0.0100 mm. Aiming at the urgent demand of domestic substitution of the ultrahigh-strength stainless steel microwire for photovoltaic cell screen printing, the invention breaks through the precision manufacturing technology of the 10-micron stainless steel microwire, establishes a cold drawing process optimization criterion, realizes ultrahigh strength, realizes fine regulation and control of residual stress of the microwire and improvement of straightness, and realizes industrial production of a high-homogeneity wire rod.

Description

Technical Field

[0001] The invention relates to the technical field of metal material processing, in particular to a preparation process of stainless steel microwires for photovoltaic cell screen printing. Background Art

[0002] The ultra-high-strength stainless steel microwire used for photovoltaic cell screen printing has the characteristics of high strength, high tension and high dimensional accuracy, which is very suitable for precision printing. Compared with other steel mesh materials, ultra-high-strength stainless steel microwire can be used with finer wire diameters, which makes it have greater advantages in plate making and can print higher-quality patterns. At the same time, its high strength also ensures stability and durability during the printing process.

[0003] At present, the metal lattice distortion and wire texture phenomenon in the process of drawing domestic ultra-high strength stainless steel microwires: During the drawing process of the microwires, the metal lattice distortion is caused by large uneven deformation, and the grain fragmentation phenomenon is very serious. As the drawing process proceeds, the grains are elongated into fibers along the drawing direction and wire texture phenomenon occurs.

[0004] Therefore, it is desired to provide a preparation process of stainless steel microwires for screen printing of photovoltaic cells, which can solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a preparation process of stainless steel microwires for photovoltaic cell screen printing. In response to the urgent need for domestic substitution of ultra-high strength stainless steel microwires for photovoltaic cell screen printing, the present invention breaks through the precision manufacturing technology of 10-micron stainless steel microwires, establishes cold drawing process optimization criteria and achieves ultra-high strength, realizes fine control of microwire residual stress and improvement of straightness, and realizes the industrial production of high-homogeneity wire rods.

[0006] In order to achieve the above-mentioned purpose of the invention, a process for preparing stainless steel microwires for screen printing of photovoltaic cells is provided, comprising the following steps:

[0007] S1. Raw material selection: Select stainless steel wire with a diameter of 1 mm and grade 304N as the raw material;

[0008] S2, water tank machine rough drawing: the stainless steel wire with a diameter of 1 mm and grade 304N prepared in step S1 is drawn to a diameter of 0.030 mm;

[0009] S3, annealing of stainless steel wire: annealing the stainless steel wire drawn in S2;

[0010] S4, drawing in water tank machine: drawing the annealed stainless steel wire to a diameter of 0.18 mm;

[0011] S5, non-slip wet drawing: the stainless steel wire treated in step S4 is drawn to 0.0100 mm.

[0012] Specifically, in step S2, the specific drawing passes of the water tank machine rough drawing are:

[0013] 1.0-0.921-0.855-0.794-0.737-0.684-0.635-0.590-0.548-0.509-0.472-0.438-0.407-0.378-0.351-0.326-0.30mm.

[0014] Specifically, in step S3, the stainless steel wire passes through a furnace tube in an annealing furnace at a speed of 5 to 10 m / s, wherein the annealing temperature in the furnace tube is 550 to 600° C., the furnace tube is filled with protective gas, and the length of the furnace tube is 1200 to 1700 mm.

[0015] Furthermore, in step S3, the protective gas is ammonia gas, and the furnace tube is a quartz tube.

[0016] Specifically, in step S4, the specific drawing passes of the water tank machine rough drawing are:

[0017] 0.3-0.281-0.261-0.242-0.225-0.209-0.194-0.18mm.

[0018] Specifically, in step S5, the non-slip wet pulling is divided into five pulling steps, which are:

[0019] A1, 0.18-0.083;

[0020] A2, 0.083-0.041;

[0021] A3, 0.41-0.021;

[0022] A4, 0.021-0.013;

[0023] A5, 0.013-0.0100.

[0024] Furthermore, in A1, the specific drawing passes are:

[0025] 0.18-0.168-0.155-0.143-0.132-0.122-0.113-0.105-0.097-0.089-0.083mm.

[0026] Furthermore, in A2, the specific drawing passes are:

[0027] 0.083-0.0774-0.0721-0.0672-0.0626-0.0583-0.0544-0.0507-0.0472-0.044-0.041mm.

[0028] Furthermore, in A3, the specific drawing passes are:

[0029] 0.041-0.038-0.0354-0.0331-0.031-0.0288-0.027-0.0255-0.0239-0.0223-0.021mm.

[0030] Further,

[0031] In A4, the specific drawing passes are:

[0032] 0.021-0.0201-0.0192-0.0183-0.0174-0.0166-0.0158-0.0150-0.0143-0.0316-0.013mm.

[0033] Further,

[0034] In A5, the specific drawing passes are:

[0035] 0.013-0.0126-0.01204-0.01151-0.011-0.01065-0.0103-0.0100mm.

[0036] The preparation process of the stainless steel microwire for screen printing of photovoltaic cells of the present invention has the following advantages compared with the prior art:

[0037] (1) Realize the industrialized production of highly homogeneous wire rods; break through the precision manufacturing technology of 10-micron stainless steel microwires, establish cold drawing process optimization criteria and achieve ultra-high strength, achieve fine control of microwire residual stress and improvement of straightness, develop precise control systems for micro-tension drawing and direct-drive wire arrangement technology; realize high-mesh stainless steel wire mesh weaving and screen manufacturing, and conduct verification in the industrial process of photovoltaic cell screen printing, with performance meeting actual production needs;

[0038] (2) The production process is simplified and highly efficient and energy-saving. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with specific embodiments.

[0040] Example 1

[0041] The preparation process of a stainless steel microwire for screen printing of photovoltaic cells in this embodiment comprises the following steps:

[0042] S1. Raw material selection: Select stainless steel wire with a diameter of 1 mm and grade 304N as the raw material;

[0043] S2, water tank machine rough drawing: the stainless steel wire with a diameter of 1 mm and grade 304N prepared in step S1 is drawn to a diameter of 0.030 mm; the specific drawing passes of the water tank machine rough drawing are:

[0044] 1.0-0.921-0.855-0.794-0.737-0.684-0.635-0.590-0.548-0.509-0.472-0.438-0.407-0.378-0.351-0.326-0.30mm.

[0045] S3, stainless steel wire annealing: the stainless steel wire drawn in S2 is annealed; the stainless steel wire passes through the furnace tube in the annealing furnace at a speed of 5-10 m / s, wherein the annealing temperature in the furnace tube is 550-600°C, the furnace tube is filled with protective gas, and the length of the furnace tube is 1200-1700 mm; the protective gas is ammonia, and the furnace tube is a quartz tube.

[0046] S4, drawing in water tank machine: drawing the annealed stainless steel wire to a diameter of 0.18 mm;

[0047] The specific drawing passes of the water tank machine rough drawing are:

[0048] 0.3-0.281-0.261-0.242-0.225-0.209-0.194-0.18mm.

[0049] S5, non-slip wet drawing: the stainless steel wire treated in step S4 is drawn to 0.0100 mm.

[0050] The non-slip wet pulling is divided into 5 drawing steps, which are:

[0051] A1, 0.18-0.083;

[0052] A2, 0.083-0.041;

[0053] A3, 0.41-0.021;

[0054] A4, 0.021-0.013;

[0055] A5, 0.013-0.0100.

[0056] Among them, in A1, the specific drawing passes are

[0057] 0.18-0.168-0.155-0.143-0.132-0.122-0.113-0.105-0.097-0.089-0.083mm.

[0058] Among them, in A2, the specific drawing passes are

[0059] 0.083-0.0774-0.0721-0.0672-0.0626-0.0583-0.0544-0.0507-0.0472-0.044-0.041mm.

[0060] Among them, in A3, the specific drawing passes are

[0061] 0.041-0.038-0.0354-0.0331-0.031-0.0288-0.027-0.0255-0.0239-0.0223-0.021mm.

[0062] Among them, in A4, the specific drawing passes are

[0063] 0.021-0.0201-0.0192-0.0183-0.0174-0.0166-0.0158-0.0150-0.0143-0.0316-0.013mm.

[0064] Among them, in A5, the specific drawing passes are

[0065] 0.013-0.0126-0.01204-0.01151-0.011-0.01065-0.0103-0.0100mm.

[0066] Breakthrough in ultra-high purity stainless steel smelting technology, achieve effective control of microscopic inclusions, inclusion fraction ≤ 0.01%, average inclusion size ≤ 2 microns, maximum inclusion size ≤ 5 microns; achieve three-dimensional quantitative characterization of microwire organizational structure and its evolution law, develop strength prediction model based on microstructure parameters and strengthening mechanism, error ≤ 10%; microwire diameter ≤ 10 microns, nominal size deviation ≤ 5%, maximum tensile strength in drawn state ≥ 3.2GPa; achieve continuous drawing of 10,000 meters without breaking the wire, and the microwire surface is bright.

[0067] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A process for preparing stainless steel microwires for screen printing of photovoltaic cells, characterized in that: The following steps are included: S1. Raw material selection: Select stainless steel wire with a diameter of 1 mm and grade 304N as the raw material; S2, water tank machine rough drawing: the stainless steel wire with a diameter of 1 mm and grade 304N prepared in step S1 is drawn to a diameter of 0.030 mm; S3, annealing of stainless steel wire: annealing the stainless steel wire drawn in S2; S4, drawing in water tank machine: drawing the annealed stainless steel wire to a diameter of 0.18 mm; S5, non-slip machine wet drawing: the stainless steel wire treated in step S4 is drawn to 0.0100 mm.

2. A process for preparing stainless steel microwires for screen printing of photovoltaic cells as claimed in claim 1, characterized in that: In step S2, the specific drawing passes of the water tank machine rough drawing are 1.0-0.921-0.855-0.794-0.737-0.684-0.635-0.590-0.548-0.509-0.472-0.438-0.407-0.378-0.351-0.326-0.30mm.

3. A process for preparing stainless steel microwires for screen printing of photovoltaic cells as claimed in claim 1 or 2, characterized in that: In step S3, the stainless steel wire passes through a furnace tube in an annealing furnace at a speed of 5-10 m / s, wherein the annealing temperature in the furnace tube is 550-600° C., the furnace tube is filled with protective gas, and the length of the furnace tube is 1200-1700 mm.

4. A process for preparing stainless steel microwires for screen printing of photovoltaic cells as claimed in claim 3, characterized in that: In step S3, the protective gas is ammonia gas, and the furnace tube is a quartz tube.

5. The process for preparing stainless steel microwire for screen printing of photovoltaic cells as claimed in claim 1, characterized in that: In step S4, the specific drawing passes of the water tank machine rough drawing are 0.3-0.281-0.261-0.242-0.225-0.209-0.194-0.18 mm.

6. The process for preparing stainless steel microwire for screen printing of photovoltaic cells as claimed in claim 1, characterized in that: In step S5, the non-slip wet pulling is divided into five pulling steps, which are: A1、0.18-0.083； A2、0.083-0.041； A3、0.41-0.021； A4、0.021-0.013； A5、0.013-0.0100。 7. A process for preparing stainless steel microwires for screen printing of photovoltaic cells as claimed in claim 6, characterized in that: In A1, the specific drawing passes are 0.18-0.168-0.155-0.143-0.132-0.122-0.113-0.105-0.097-0.089-0.083 mm.

8. A process for preparing stainless steel microwires for screen printing of photovoltaic cells as claimed in claim 7, characterized in that: In A2, the specific drawing passes are 0.083-0.0774-0.0721-0.0672-0.0626-0.0583-0.0544-0.0507-0.0472-0.044-0.041 mm.

9. A process for preparing stainless steel microwires for screen printing of photovoltaic cells as claimed in claim 8, characterized in that: In A3, the specific drawing passes are 0.041-0.038-0.0354-0.0331-0.031-0.0288-0.027-0.0255-0.0239-0.0223-0.021 mm.

10. A process for preparing stainless steel microwires for screen printing of photovoltaic cells as claimed in claim 9, characterized in that: In A4, the specific drawing passes are 0.021-0.0201-0.0192-0.0183-0.0174-0.0166-0.0158-0.0150-0.0143-0.0316-0.013 mm.

11. The process for preparing stainless steel microwires for screen printing of photovoltaic cells according to claim 9, characterized in that: In A5, the specific drawing passes are 0.013-0.0126-0.01204-0.01151-0.011-0.01065-0.0103-0.0100mm.