Turntable for tungsten alloy thick wire drawing and tungsten alloy thick wire drawing method adopting same

Abstract

The invention relates to the technical field of tungsten filament drawing, in particular to a rotating disc for tungsten alloy thick filament drawing and a tungsten alloy thick filament drawing method adopting the rotating disc, and provides a rotating disc with a specific structure, the rotating disc guides tungsten filaments to be arranged in order through a transition arc and a screw supporting tap block, overlapping of the tungsten filaments is eradicated, and the filament breaking rate is effectively reduced. And in cooperation with the relation of the wire diameter, the speed and the temperature, the plasticity and toughness of the tungsten wire are perfectly balanced, the wire breaking rate is remarkably reduced, the wire drawing success rate is increased, the wire breaking phenomenon does not occur in the drawing process, and the wire stacking rate is zero. Meanwhile, the waste graphite ash is changed into waste, so that the value of the aquadag is improved, and the production efficiency is also improved.

Description

Technical Field

[0001] The invention relates to the technical field of tungsten wire drawing, in particular to a turntable for drawing a tungsten alloy thick wire and a tungsten alloy thick wire drawing method using the turntable. Background Art

[0002] Tungsten alloy wire has been widely used in the photovoltaic industry in recent years due to its outstanding properties, such as high strength, high hardness and high temperature resistance, especially in the busbar of silicon wafer cutting consumables, gradually replacing some traditional high-carbon steel wires. Tungsten alloy wire not only meets the high requirements of the photovoltaic industry for cutting materials, but also brings significant commercial value and economic benefits. However, despite the excellent performance of tungsten alloy wire in applications, its production process still faces technical challenges, especially in the drawing process, and related problems need to be solved urgently.

[0003] Tungsten alloy wire needs to go through multiple drawing processes during the production process, among which the drawing of thick wire (tungsten wire with a diameter greater than 0.355mm is called thick wire) is the only way to prepare fine wire. The drawing of thick wire is generally heated by gases such as natural gas, propane, and hydrogen. The tungsten alloy wire is driven through the die by the rotation of the wire collection turntable, so that the thick wire is drawn to obtain a thinner tungsten alloy wire and wound in the turntable. Traditional wire collection turntables usually use pig iron as the material. Since pig iron easily reacts with water vapor in the air, the surface of the turntable is often covered with rust, which not only increases the friction during the wire collection process, but also may pollute the surface of the tungsten wire; secondly, the cylindrical winding tube in the traditional wire collection turntable is vertically connected to the bottom support plate. This design makes the tungsten alloy wire bear a large upward extrusion force during the wire collection process. Therefore, in the process of driving the wire collection by the rotation of the traditional wire collection turntable, due to problems such as poor lubrication of the turntable and unreasonable design, the tungsten alloy wire has different degrees of overlap or even broken wire. Especially when drawing tungsten alloy wire with a wire diameter greater than 1.9mm, the extrusion force generated during the wire collection process increases accordingly due to the large drawing force required. When the sum of the extrusion force of the wire collection disk and the drawing force exceeds the yield strength of the tungsten alloy wire, the tungsten alloy wire is prone to breakage. Wire breakage not only affects the continuous production of drawing, but also has a serious impact on the product quality and production efficiency of the tungsten alloy wire. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a turntable for drawing a tungsten alloy thick wire and a tungsten alloy thick wire drawing method using the turntable.

[0005] According to one aspect of the present invention, the present invention provides the following technical solution: A rotating disc for drawing tungsten alloy thick wires, comprising a cylinder and a screw support taper block, wherein the cylinder and the screw support taper block are connected by a transition arc; And the diameter of the cylinder D1 is (624+100ø 2)mm, the height H1 of the cylinder is (210-10×ø)mm; the length L1 of the transition arc along the axial direction is (D1 / (120-185))mm, and the length L2 of the transition arc along the radial direction is ((0.4-0.6)×L1)mm; the bottom cross-sectional diameter D2 of the supporting taper block is (2×(L2+L3)+D1)mm, where L3=((0.9-1.05)×L1+(0.6-0.85)×L2)mm; the R of the transition arc is (20×ø)mm; where ø is the hole diameter of the wire drawing die, in mm.

[0006] According to another aspect of the present invention, the present invention provides the following technical solution: A method for drawing a tungsten alloy thick wire, using the above-mentioned turntable for drawing a tungsten alloy thick wire, comprises the following steps: S1. Pour graphite ash produced by tungsten wire drawing, pure water and a binder into a stirring barrel in a weight ratio of 7:(9-10):(3-4), and stir for 30-70 minutes to make the viscosity of the mixture 4.3-6.5 cP to prepare a graphite emulsion; S2. Apply the graphite emulsion evenly to the surface of the turntable, and repeat the application 3 to 5 times to ensure that the surface is fully covered; S3. Place the mother wire head in a heating furnace and heat for 3-5 minutes. After high temperature treatment, place the wire head in a sodium nitrite tank for sintering, and use a cleaning cloth to remove excess sodium nitrite on the surface of the tungsten wire. S4, put the mother wire into a three-stage heating furnace for heating, the temperatures of the heating furnace are: T1=(380+150×ø)℃, T2=(T1+50×(5-ø))℃, T3=(T2+40×(6-ø))℃, the heated tungsten wire passes through the wire drawing die for drawing; S5. Use wire clamps to pull the tungsten wire from the die outlet to the turntable, and fix the wire clamps on the turntable, wherein the compression ratio (i.e., the ratio of the reduction in the diameter of the tungsten wire after drawing to the original tungsten wire diameter) is 15-30%, the die temperature is (480+15×ø)℃, and the wire drawing speed is (8-2×ø)m / min; S6. Turn on the wire collection motor, and the turntable rotates to drive the wire drawing and collection.

[0007] The beneficial effects of the present invention are as follows: The present invention provides a turntable for drawing tungsten alloy thick wire and a method for drawing tungsten alloy thick wire using the same, and provides a turntable with a specific structure. The turntable guides the tungsten wires to be arranged in an orderly manner through a transition arc and a wire support cone block, thereby eliminating the overlap of the tungsten wires and effectively reducing the wire breakage rate. In addition, the present invention coordinates the relationship between the wire diameter, speed, and temperature, perfectly balances the plasticity and toughness of the tungsten wire, significantly reduces the wire breakage rate, and improves the wire drawing success rate. No wire breakage occurs during the drawing process, and the wire overlap rate is zero. At the same time, waste graphite ash is converted into waste, which not only increases the value of graphite emulsion but also improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0009] Figure 1 It is a schematic diagram of the overall structure of the turntable of the present invention; Figure 2 It is a front view of the turntable of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0010] Among them, 1-cylinder; 2-screw cone block; 3-transition arc.

[0011] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0012] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] According to one aspect of the present invention, the present invention provides the following technical solution: like Figure 1-3 As shown, a rotary table for drawing tungsten alloy thick wires comprises a cylinder 1 and a screw taper block 2, and the cylinder 1 and the screw taper block 2 are connected by a transition arc 3; And the diameter D1 of cylinder 1 is (624+100ø 2)mm, the height H1 of the cylinder 1 is (210-10×ø)mm; the length L1 of the transition arc 3 along the axial direction is (D1 / (120-185))mm, and the length L2 of the transition arc 3 along the radial direction is ((0.4-0.6)×L1)mm; the bottom cross-sectional diameter D2 of the supporting taper block 2 is (2×(L2+L3)+D1)mm, where L3=((0.9-1.05)×L1+(0.6-0.85)×L2)mm; the R of the transition arc 3 is (20×ø)mm; where ø is the hole diameter of the wire drawing die, in mm.

[0014] According to another aspect of the present invention, the present invention provides the following technical solution: A method for drawing a tungsten alloy thick wire, using the above-mentioned turntable for drawing a tungsten alloy thick wire, comprises the following steps: S1. Pour graphite ash produced by tungsten wire drawing, pure water and a binder into a stirring barrel in a weight ratio of 7:(9-10):(3-4), and stir for 30-70 minutes to make the viscosity of the mixture 4.3-6.5 cP to prepare a graphite emulsion; S2. Apply the graphite emulsion evenly to the surface of the turntable, and repeat the application 3 to 5 times to ensure that the surface is fully covered; S3. Place the mother wire head in a heating furnace and heat for 3-5 minutes. After high temperature treatment, place the wire head in a sodium nitrite tank for sintering, and use a cleaning cloth to remove excess sodium nitrite on the surface of the tungsten wire. S4, put the mother wire into a three-stage heating furnace for heating, the temperatures of the heating furnace are: T1=(380+150×ø)℃, T2=(T1+50×(5-ø))℃, T3=(T2+40×(6-ø))℃, the heated tungsten wire passes through the wire drawing die for drawing; S5. Use wire clamps to pull the tungsten wire from the die outlet to the turntable, and fix the wire clamps on the turntable, wherein the compression ratio is 15-30%, the mold temperature is (480+15×ø)℃, and the wire drawing speed is (8-2×ø)m / min; S6. Turn on the wire collection motor, and the turntable rotates to drive the wire drawing and collection.

[0015] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0016] Example 1 A method for drawing a tungsten alloy thick wire comprises the following steps: S1. Pour graphite ash produced by tungsten wire drawing, pure water and a binder into a stirring barrel in a weight ratio of 7:10:3, and stir for 50 minutes to make the viscosity of the mixture 4.8 cP to prepare a graphite emulsion; S2. Apply the graphite emulsion evenly to the surface of the turntable, and repeat the application 4 times to ensure that the surface is fully covered; S3. Select a tungsten wire with a diameter of 2.4mm and a mass of 5.3kg as the mother wire. Place the mother wire head in a heating furnace and heat it for 4 minutes. After high-temperature treatment, place the wire head in a sodium nitrite tank for sintering, and use a cleaning cloth to remove excess sodium nitrite on the surface of the tungsten wire. S4, use a wire drawing die with an aperture of ø1.9mm for drawing, put the mother wire into a three-stage heating furnace for heating, the temperatures of the heating furnace are: T1=665℃, T2=820℃, T3=984℃, the heated tungsten wire passes through the wire drawing die for drawing; S5. Use wire clamps to pull the tungsten wire from the die outlet to the turntable, and fix the wire clamps on the turntable. The diameter D1 of the cylinder of the turntable is 985mm, and the height H1 of the cylinder is 191mm; the length L1 of the transition arc along the axial direction is 6.4mm, and the length L2 of the transition arc along the radial direction is 2.6mm; the bottom cross-sectional diameter D2 of the support taper block is 1004.8mm, where L3=7.3mm; the R of the transition arc is 38mm; the compression ratio is 20.83%, the mold temperature is 508.5℃, and the wire drawing speed is 4.2m / min; S6. Turn on the wire collection motor, and the turntable rotates to drive the wire drawing and collection. Under this condition, the wire is drawn 10 times without wire breakage and the wire overlap rate is zero.

[0017] Example 2 A method for drawing a tungsten alloy thick wire comprises the following steps: S1. Pour graphite ash produced by tungsten wire drawing, pure water and a binder into a stirring barrel in a weight ratio of 7:10:4, and stir for 60 minutes to make a viscosity of 5.6 cP to prepare a graphite emulsion; S2. Apply the graphite emulsion evenly to the surface of the turntable, and repeat the application 5 times to ensure that the surface is fully covered; S3. Select a tungsten wire with a diameter of 2.9 mm and a mass of 5.5 kg as the mother wire. Place the mother wire head in a heating furnace and heat it for 5 minutes. After high-temperature treatment, place the wire head in a sodium nitrite tank for sintering, and use a cleaning cloth to remove excess sodium nitrite on the surface of the tungsten wire. S4, use a wire drawing die with an aperture of 2.4mm for drawing, put the mother wire into a three-stage heating furnace for heating, the temperatures of the heating furnace are: T=740℃, T2=870℃, T3=1014℃, and the heated tungsten wire passes through the wire drawing die for drawing; S5. Use wire clamps to pull the tungsten wire from the die outlet to the turntable, and fix the wire clamps on the turntable. The diameter D1 of the cylinder of the turntable is 1200mm, and the height H1 of the cylinder is 186mm. The length L1 of the transition arc along the axial direction is 7.7mm, and the length L2 of the transition arc along the radial direction is 3.9mm. The bottom cross-sectional diameter D2 of the support taper block is 1230.6mm, where L3=11.4mm; the R of the transition arc is 48mm; the compression ratio is 17.24%, the mold temperature is 516℃, and the wire drawing speed is 3.2m / min. S6. Turn on the wire collection motor, and the turntable rotates to drive the wire drawing and collection. Under this condition, the wire is drawn 10 times without wire breakage and the wire overlap rate is zero.

[0018] Example 3 A method for drawing a tungsten alloy thick wire comprises the following steps: S1. Pour graphite ash produced by tungsten wire drawing, pure water and a binder into a stirring barrel in a weight ratio of 7:9:4, and stir for 70 minutes to obtain a graphite emulsion with a viscosity of 6.3 cP; S2. Apply the graphite emulsion evenly to the surface of the turntable, and repeat the application 3 times to ensure that the surface is fully covered; S3. Select a tungsten wire with a diameter of 3.5 mm and a mass of 5.8 kg as the mother wire. Place the mother wire head in a heating furnace and heat it for 3 minutes. After high-temperature treatment, place the wire head in a sodium nitrite tank for sintering, and use a cleaning cloth to remove excess sodium nitrite on the surface of the tungsten wire. S4, use a wire drawing die with an aperture of 2.9 mm for drawing, put the mother wire into a three-stage heating furnace for heating, the temperatures of the heating furnace are: T = 815 ° C, T2 = 920 ° C, T3 = 1044 ° C, the heated tungsten wire passes through the wire drawing die for drawing; S5. Use wire clamps to pull the tungsten wire from the die outlet to the turntable, and fix the wire clamps on the turntable. The diameter D1 of the cylinder of the turntable is 1465mm, and the height H1 of the cylinder is 181mm. The length L1 of the transition arc along the axial direction is 9.4mm, and the length L2 of the transition arc along the radial direction is 5.6mm. The bottom cross-sectional diameter D2 of the support taper block is 1505.4mm, where L3=14.6mm; the R of the transition arc is 58mm; the compression ratio is 17.14%, the mold temperature is 523.5℃, and the wire drawing speed is 2.2m / min. S6. Turn on the wire collection motor, and the turntable rotates to drive the wire drawing and collection. Under this condition, the wire is drawn 10 times without wire breakage and the wire overlap rate is zero.

[0019] Comparative Example 1 The difference from the first embodiment is that the length L1 of the transition arc along the axial direction is 4.3 mm.

[0020] After drawing and collecting the wire, the wire was broken 15 times in total, and the wire overlap rate was 5%.

[0021] Comparative Example 2 The difference from the first embodiment is that the length L2 of the transition arc along the radial direction is 6.3 mm.

[0022] After drawing and collecting the wire, the wire was broken 10 times in total, and the wire overlap rate was 2%.

[0023] Comparative Example 3 The difference from Example 1 is that the R of the transition arc is 3.7 mm.

[0024] After drawing and collecting the wire, the wire was broken 23 times in total, and the wire overlap rate was 0%.

[0025] Comparative Example 4 The difference from Example 1 is that the mold temperature is 470°C.

[0026] After drawing and collecting the wire, the wire was broken 18 times in total, and the wire overlap rate was 0%.

[0027] Comparative Example 5 The difference from Example 1 is that the wire drawing speed is 5.5 m / min.

[0028] After drawing and collecting the wire, the wire was broken 8 times in total, and the wire overlap rate was 0%.

[0029] Comparative Example 6 The difference from Example 1 is that a traditional turntable in which a cylinder and a bottom support plate are vertically connected is used.

[0030] After drawing and collecting the wire, the wire was broken 27 times in total, and the wire overlap rate was 0%.

[0031] Comparative Example 7 The difference from Example 1 is that the surface of the turntable is not coated with graphite emulsion.

[0032] After drawing and collecting the wire, the wire was broken 23 times and the wire overlap rate was 10%.

[0033] Comparative Example 8 The difference from Example 1 is that a three-stage heating furnace is not used, but a one-stage heating furnace is used, and its temperature is 980°C.

[0034] After drawing and collecting the wire, the wire was broken 18 times in total, and the wire overlap rate was 0%.

[0035] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A turntable for drawing tungsten alloy thick wire, characterized in that: It includes a cylinder and a screw taper block, and the cylinder and the screw taper block are connected by a transition arc; And the diameter of the cylinder D1 is (624+100ø 2 )mm, the height H1 of the cylinder is (210-10×ø)mm; the length L1 of the transition arc along the axial direction is (D1 / (120-185))mm, and the length L2 of the transition arc along the radial direction is ((0.4-0.6)×L1)mm; the bottom cross-sectional diameter D2 of the supporting taper block is (2×(L2+L3)+D1)mm, where L3=((0.9-1.05)×L1+(0.6-0.85)×L2)mm; the R of the transition arc is (20×ø)mm; where ø is the hole diameter of the wire drawing die, in mm.

2. A method for drawing tungsten alloy thick wire, characterized in that: The rotary table for drawing tungsten alloy thick wire according to claim 1 comprises the following steps: S1, stirring graphite ash produced by tungsten wire drawing with pure water and a binder to obtain a graphite emulsion; S2. Apply the graphite emulsion evenly to the surface of the turntable to ensure full coverage of the surface; S3. Place the mother wire head in a heating furnace for heating. After high temperature treatment, place the wire head in a sodium nitrite tank for smelting, and use a cleaning cloth to remove excess sodium nitrite on the surface of the tungsten wire; S4, putting the mother wire into a three-stage heating furnace for heating, and the heated tungsten wire passes through a wire drawing die for drawing; S5. Use wire clamps to pull the tungsten wire from the die outlet to the turntable, and fix the wire clamps on the turntable; S6. Turn on the wire collection motor, and the turntable rotates to drive the wire drawing and collection.

3. The tungsten alloy thick wire drawing method according to claim 2, characterized in that: In the step S1, the weight ratio of graphite ash, pure water and binder is 7:(9-10):(3-4).

4. The method for drawing tungsten alloy thick wire according to claim 2, characterized in that: In step S1, the stirring time is 30 to 70 minutes.

5. The method for drawing tungsten alloy thick wire according to claim 2, characterized in that: In the step S1, the viscosity of the graphite emulsion is 4.3-6.5 cP.

6. The method for drawing tungsten alloy thick wire according to claim 2, characterized in that: In step S4, the temperatures of the heating furnace are respectively: T1=(380+150×ø)°C, T2=(T1+50×(5-ø))°C, and T3=(T2+40×(6-ø))°C.

7. The method for drawing tungsten alloy thick wire according to claim 2, characterized in that: In step S5, the compression ratio is 15-30%.

8. The method for drawing tungsten alloy thick wire according to claim 2, characterized in that: In step S5, the mold temperature is (480+15×ø)°C.

9. The method for drawing tungsten alloy thick wire according to claim 2, characterized in that: In the step S5, the wire drawing speed is (8-2×ø) m / min.

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