An apparatus and process for straightening the free coil diameter of ultra-fine tungsten wire

Abstract

The present invention belongs to the technical field of tungsten wire drawing, and particularly relates to a device and process for straightening the free coil diameter of ultra-fine tungsten wire. A cylindrical heating furnace tube is arranged on a frame, and a wire feeding device and a wire winding device are respectively installed at both ends of the frame. Guide wheels are arranged at both ends of the cylindrical heating furnace tube. An air vortex tube is arranged along the tangential direction of the tube wall of the cylindrical heating furnace tube and is communicated with the inside of the cylindrical heating furnace tube for introducing air into the cylindrical heating furnace tube. The present invention can control the temperature evenly, ensure the uniform elimination of stress of the ultra-fine tungsten wire, improve the coil diameter of the wire material, and greatly improve the qualification rate of the ultra-fine tungsten wire. At the same time, the temperature in the cylindrical heating furnace tube of the present invention is 350-500 °C, which does not exceed the recrystallization temperature of the tungsten wire, has little influence on the strength of the ultra-fine tungsten wire, and can ensure the original breaking force of the ultra-fine tungsten wire.

Description

Technical Field

[0001] The present invention belongs to the technical field of tungsten wire drawing, and specifically relates to an apparatus and process for straightening the free coil diameter of ultra-fine tungsten wire. Background Art

[0002] Currently, there are many enterprises producing ultra-fine tungsten wire, but the number of enterprises capable of achieving large-scale production is very limited. There is a very important index for ultra-fine tungsten wire used for cutting photovoltaic silicon wafers, that is, the free coil diameter. The free coil diameter of the wire should be greater than or equal to 55 mm to be qualified. The coil diameter directly affects the yield and efficiency of ultra-fine tungsten wire production. When the coil diameter is small, the wire is prone to breakage, resulting in a long die change time and affecting production efficiency. At the same time, ultra-fine tungsten wire with a small coil diameter is also prone to breakage during the process of cutting silicon plates, causing losses to the silicon plates. The defective rate of ultra-fine tungsten wire in the industry is greater than 20%, and the defective rate of the free coil diameter accounts for 90% of the total defective rate. During the production process, if ultra-fine tungsten wire becomes sluggish defective due to unqualified free coil diameter, it will bring a huge impact to the operation of the enterprise, because the downgraded processing of sluggish defective products leads to the inability to recover the processing cost. Therefore, how to process and convert ultra-fine tungsten wire with unqualified free coil diameter into qualified products is a difficult problem that needs to be urgently solved in the industry. Summary of the Invention

[0003] To solve the problems existing in the prior art, the main object of the present invention is to propose an apparatus and process for straightening the free coil diameter of ultra-fine tungsten wire.

[0004] To solve the above technical problems, according to one aspect of the present invention, the following technical solutions are provided:

[0005] An apparatus for straightening the free coil diameter of ultra-fine tungsten wire, comprising:

[0006] A wire feeding device, a wire winding device, guide wheels, a cylindrical heating furnace tube, and an air vortex tube;

[0007] The cylindrical heating furnace tube is provided with a wire feeding device and a wire winding device at both ends respectively. Guide wheels are arranged between the wire feeding device and the wire winding device and both ends of the cylindrical heating furnace tube. The air vortex tube is arranged along the tangential direction of the inner wall of the cylindrical heating furnace tube and is communicated with the inside of the cylindrical heating furnace tube for introducing air into the cylindrical heating furnace tube.

[0008] As a preferred embodiment of the apparatus for straightening the free coil diameter of ultra-fine tungsten wire according to the present invention, wherein: both ends of the cylindrical heating furnace tube are closed, and only an opening is provided at the center of the end face for the ultra-fine tungsten wire to pass through.

[0009] As a preferred embodiment of the apparatus for straightening the free coil diameter of ultra-fine tungsten wire according to the present invention, wherein: heating rods are evenly distributed circumferentially on the inner wall of the cylindrical heating furnace tube for controlling the temperature inside the cylindrical heating furnace tube.

[0010] To solve the above technical problems, according to another aspect of the present invention, the present invention provides the following technical solutions:

[0011] A process for straightening the free coil diameter of ultra-fine tungsten wire, using the above-mentioned equipment for straightening the free coil diameter of ultra-fine tungsten wire, the ultra-fine tungsten wire with poor coil diameter on the wire feeding device passes through the cylindrical heating furnace tube and is then wound by the wire winding device.

[0012] As a preferred scheme of the process for straightening the free coil diameter of ultra-fine tungsten wire according to the present invention, wherein: the temperature inside the cylindrical heating furnace tube is 350~500°C.

[0013] As a preferred scheme of the process for straightening the free coil diameter of ultra-fine tungsten wire according to the present invention, wherein: the air flow rate is 5~10m / s.

[0014] As a preferred scheme of the process for straightening the free coil diameter of ultra-fine tungsten wire according to the present invention, wherein: the air pressure is 0.5~0.65MPa.

[0015] As a preferred scheme of the process for straightening the free coil diameter of ultra-fine tungsten wire according to the present invention, wherein: the winding speed of the wire winding device is 90~120m / min, and the winding tension is 0.75~0.85cN.

[0016] The beneficial effects of the present invention are as follows:

[0017] The present invention provides an equipment and a process for straightening the free coil diameter of ultra-fine tungsten wire. The cylindrical heating furnace tube is arranged on the frame, and a wire feeding device and a wire winding device are respectively installed at both ends of the frame. Guide wheels are arranged at both ends of the cylindrical heating furnace tube. The air vortex tube is arranged tangentially along the wall of the cylindrical heating furnace tube and is communicated with the inside of the cylindrical heating furnace tube for introducing air into the cylindrical heating furnace tube. The present invention can uniformly control the temperature, ensure the uniform elimination of the stress of the ultra-fine tungsten wire, improve the coil diameter of the wire material, and greatly improve the qualification rate of the ultra-fine tungsten wire; at the same time, the temperature inside the cylindrical heating furnace tube of the present invention is 350~500°C, which does not exceed the recrystallization temperature of the tungsten wire, has little influence on the strength of the ultra-fine tungsten wire, and can ensure the original breaking force of the ultra-fine tungsten wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0019] Figure 1 This is a schematic structural diagram of the device for straightening the free coil diameter of ultra-fine tungsten wire according to the present invention.

[0020] Figure 2 For Figure 1 This is a cross-sectional view of the cylindrical heating furnace tube along the air vortex tube in

[0021] Among them, 1 - wire feeding device, 2 - wire winding device, 3 - guide wheel, 4 - cylindrical heating furnace tube, 5 - air vortex tube, 6 - heating rod.

[0022] The realization of the effects, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in combination with embodiments. Specific embodiments

[0023] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all 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.

[0024] According to one aspect of the present invention, the present invention provides the following technical solutions:

[0025] As Figure 1-2 shown, a device for straightening the free coil diameter of ultra-fine tungsten wire includes:

[0026] A wire feeding device 1, a wire winding device 2, a guide wheel 3, a cylindrical heating furnace tube 4, an air vortex tube 5;

[0027] The two ends of the cylindrical heating furnace tube 4 are respectively provided with a wire feeding device 1 and a wire winding device 2. Guide wheels 3 are arranged between the wire feeding device 1 and the wire winding device 2 and the two ends of the cylindrical heating furnace tube 4. The air vortex tube 5 is arranged along the tangential direction of the wall of the cylindrical heating furnace tube 4 and is communicated with the inside of the cylindrical heating furnace tube 4 for introducing air into the cylindrical heating furnace tube 4, and introducing air can make the temperature inside the cylindrical heating furnace tube 4 more uniform.

[0028] Preferably, the two ends of the cylindrical heating furnace tube 4 are closed, and only holes are opened at the center of the end faces for the ultra-fine tungsten wire to pass through.

[0029] Preferably, heating rods 6 are evenly distributed circumferentially on the inner wall of the cylindrical heating furnace tube 4 for controlling the temperature inside the cylindrical heating furnace tube 4.

[0030] Preferably, the number of the heating rods 6 can be adjusted according to needs. For example, Figure 1 in

[0031] Preferably, the number of the air vortex tubes 5 can be adjusted according to needs. For example,Figure 1 There is 1 air vortex tube 5, and the excess air in the cylindrical heating furnace tube 4 flows out from the central holes on both sides of the cylindrical heating furnace tube 4.

[0032] According to another aspect of the present invention, the present invention provides the following technical solutions:

[0033] A process for straightening the free coil diameter of ultra-fine tungsten wire, using the above-mentioned equipment for straightening the free coil diameter of ultra-fine tungsten wire. The ultra-fine tungsten wire with poor coil diameter on the wire feeding device 1 passes through the cylindrical heating furnace tube 4 and is then wound by the wire winding device 2. Specifically, the ultra-fine tungsten wire with poor coil diameter on the wire feeding device 1 is wound around the guide wheel 3 and then passes through the cylindrical heating furnace tube 4, and then passes through the guide wheel 3 and is wound by the wire winding device 2.

[0034] Preferably, the temperature inside the cylindrical heating furnace tube 4 is 350 - 500 °C.

[0035] Preferably, the air flow rate is 5 - 10 m / s.

[0036] Preferably, the air pressure is 0.5 - 0.65 MPa.

[0037] Preferably, the wire winding speed of the wire winding device 2 is 90 - 120 m / min, and the wire winding tension is 0.75 - 0.85 cN.

[0038] The technical solutions of the present invention are further described below in conjunction with specific embodiments.

[0039] Each embodiment uses the above-mentioned equipment for straightening the free coil diameter of ultra-fine tungsten wire.

[0040] Example 1

[0041] A process for straightening the free coil diameter of ultra-fine tungsten wire. The ultra-fine tungsten wire with a wire diameter of 0.036 mm, a free coil diameter of 40 mm, and a breaking force of 6.02 N and with poor coil diameter is wound around the guide wheel and then passes through the cylindrical heating furnace tube. The temperature inside the cylindrical heating furnace tube is 400 °C, the air pressure is 0.6 MPa, and then it passes through the guide wheel and is wound by the wire winding device. The wire winding speed is 100 m / min, and the wire winding tension is 0.75 cN; the free coil diameter of the straightened ultra-fine tungsten wire is 116 mm, and the breaking force is 6.02 N.

[0042] Example 2

[0043] A process for straightening the free coil diameter of ultra-fine tungsten wire. The ultra-fine tungsten wire with a wire diameter of 0.034 mm, a free coil diameter of 36 mm, and a breaking force of 5.53 N and having a defective coil diameter is wound around a guide wheel and then passes through a cylindrical heating furnace tube. The temperature inside the cylindrical heating furnace tube is 380 °C, and the air pressure is 0.55 MPa. Then, after being wound around the guide wheel again, it is taken up by a wire take-up device. The wire take-up speed is 110 m / min, and the wire take-up tension is 0.75 cN. The free coil diameter of the straightened ultra-fine tungsten wire is 103 mm, and the breaking force is 5.49 N.

[0044] Comparative Example 1

[0045] The ultra-fine tungsten wire with a wire diameter of 0.036 mm, a free coil diameter of 45 mm, and a breaking force of 6.05 N and having a defective coil diameter is passed through a rewinder to perform a simple physical rewinding of the wire material. The free coil diameter of the obtained wire material after rewinding is 43 mm, and the breaking force is 6.04 N. The free coil diameter has no obvious change and still fails to meet the standard.

[0046] Comparative Example 2

[0047] The ultra-fine tungsten wire with a wire diameter of 0.034 mm, a free coil diameter of 41 mm, and a breaking force of 5.45 N and having a defective coil diameter is passed through a rewinder and also passes through a furnace tube at 320 °C and a die plate at 460 °C. The free coil diameter of the obtained wire material is 38 mm, and the breaking force is 5.25 N.

[0048] Comparative Example 3

[0049] The difference from Example 1 is that an air eddy current tube is not provided in the cylindrical heating furnace tube, and no air is introduced into the cylindrical heating furnace tube.

[0050] The free coil diameter of the obtained wire material is 40 mm, and the breaking force is 5.03 N, which fails to meet the standard.

[0051] Comparative Example 4

[0052] The difference from Example 1 is that the ultra-fine tungsten wire with a wire diameter of 0.034 mm, a free coil diameter of 36 mm, and a breaking force of 5.36 N and having a defective coil diameter is passed through a rewinder without tension angular displacement and also passes through a furnace tube at 400 °C and a die plate at 460 °C. The free coil diameter of the obtained wire material is 43 mm, and the breaking force is 5.32 N, and the wire diameter is extremely uneven.

[0053] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification 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 process for straightening the free circle diameter of ultra-fine tungsten wire, characterized in that: The ultra-fine tungsten wire free coil diameter straightening equipment is used. The ultra-fine tungsten wire with poor coil diameter on the wire-releasing device passes through a cylindrical heating furnace tube and then passes through a wire-collecting device to collect the wires. The air flow rate is 5-10m / s, the air pressure is 0.5-0.65MPa, the wire-collecting speed of the wire-collecting device is 90-120m / min, and the wire-collecting tension is 0.75-0.85cN. Equipment for straightening the free ring diameter of ultra-fine tungsten wire, including: Wire unwinding device, wire collecting device, guide wheel, cylindrical heating furnace tube, air vortex tube; A wire unwinding device and a wire collecting device are respectively arranged at both ends of the cylindrical heating furnace tube. Guide wheels are arranged between the wire unwinding device and the wire collecting device and both ends of the cylindrical heating furnace tube. An air vortex tube is arranged along the tangential direction of the tube wall of the cylindrical heating furnace tube and is connected with the inside of the cylindrical heating furnace tube for introducing air into the cylindrical heating furnace tube. The temperature inside the cylindrical heating furnace tube is 350~500℃.

2. The process for straightening the free circle diameter of ultra-fine tungsten wire according to claim 1, characterized in that: The cylindrical heating furnace tube is closed at both ends, with only a hole opened in the center of the end surface for the ultra-fine tungsten wire to pass through.

3. The process for straightening the free circle diameter of ultra-fine tungsten wire according to claim 1, characterized in that: Heating rods are evenly distributed on the inner wall of the cylindrical heating furnace tube in the circumferential direction and are used to control the temperature inside the cylindrical heating furnace tube.

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