Pressure stripping device for producing amorphous thin strips and pressure stripping control method

Abstract

The present invention provides a pressure strip-spinning device and a pressure strip-spinning control method for producing amorphous thin strips, which belong to the technical field of amorphous strip making, and include: a high-frequency induction furnace, an intermediate insulation bag, and a cooling roller arranged in sequence from top to bottom. A smelting vent pipe is provided on the upper part of the high-frequency induction furnace, and a furnace pressure control valve is provided on the smelting vent pipe; a liquid guide pipe is provided on the bottom of the high-frequency induction furnace, and a smelting control valve is provided on the liquid guide pipe. A cover plate capable of feeding and sealing is provided on the high-frequency induction furnace. A strip-spinning vent pipe is provided on the upper part of the intermediate insulation bag, and a bag pressure control valve is provided on the strip-spinning vent pipe; a drainage pipe is provided on the bottom of the intermediate insulation bag, and a strip-spinning control valve is provided on the drainage pipe. The lower ends of the cooling roller and the strip-spinning vent pipe have a strip-spinning space. The present invention compensates for the pressure in the intermediate insulation bag to keep the pressure value in the intermediate insulation bag stable, thereby obtaining an amorphous thin strip with a thinner and more uniform thickness, and improving the quality of the prepared amorphous thin strip.

Description

Technical Field

[0001] The invention belongs to the technical field of amorphous strip making, and in particular relates to a pressure strip-spinning device for producing amorphous thin strips and a pressure strip-spinning control method. Background Art

[0002] In recent years, amorphous materials have been widely used in high-end products in military and civilian fields due to their unique structure, excellent soft magnetic properties and mechanical properties. Generally speaking, amorphous thin strips are alloy strips with amorphous structures obtained by rapidly cooling and spinning high-temperature metal melts.

[0003] The existing pressure belt-spinning device has many difficulties such as complex equipment, difficulty in continuous production, inconsistent thickness of the produced thin strips, etc. The above difficulties will lead to problems such as easy damage of the belt, low production efficiency, and low strip quality. Summary of the invention

[0004] The embodiment of the present invention provides a pressure stripping device for producing amorphous thin strips and a pressure stripping control method, aiming to solve the problem of uneven thickness of the amorphous thin strips produced in the prior art.

[0005] In the first aspect, in order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a pressure strip-spinning device for producing amorphous thin strips, comprising:

[0006] A high-frequency induction furnace, wherein a smelting vent pipe is arranged at the upper part of the high-frequency induction furnace, and a furnace pressure control valve is arranged on the smelting vent pipe; a liquid guide pipe is arranged at the bottom of the high-frequency induction furnace, and a smelting control valve is arranged on the liquid guide pipe;

[0007] An intermediate insulation bag is arranged below the high-frequency induction furnace, and the liquid guide pipe extends into the intermediate insulation bag; a belt-swinging vent pipe is arranged on the upper part of the intermediate insulation bag, and a bag body pressure control valve is arranged on the belt-swinging vent pipe; a drainage pipe is arranged on the bottom of the intermediate insulation bag, and a belt-swinging control valve is arranged on the drainage pipe; and

[0008] The cooling roller is arranged below the middle heat-insulating bag and has a belt-swinging space with the lower end of the drainage pipe.

[0009] In combination with the first aspect, in one feasible manner, a furnace body conical guide groove is provided at the bottom of the high-frequency induction furnace, a bag body conical guide groove is provided at the bottom of the intermediate insulation bag, the liquid guide pipe is provided at the bottom of the furnace body conical guide groove, and the drainage pipe is provided at the bottom of the bag body conical guide groove.

[0010] In combination with the first aspect, in an achievable manner, it further includes a feeding cylinder and a receiving box arranged in the material throwing direction of the cooling roller, the feeding cylinder is tiltedly arranged between the cooling roller and the receiving box, and the inclination angle of the feeding cylinder is 5°-8°.

[0011] In combination with the first aspect, in one achievable manner, the distance of the belt-swinging space between the drainage tube and the cooling roller is 0.1-3 mm.

[0012] In combination with the first aspect, in an achievable manner, it further includes a bracket, wherein a furnace body buckle plate is provided on the upper portion of the bracket, a package body buckle plate is provided in the middle portion of the bracket, a furnace body fixing convex ring supported on the furnace body buckle plate is provided on the periphery of the high-frequency induction furnace; and a package body fixing convex ring supported on the package body buckle plate is provided on the periphery of the intermediate insulation bag.

[0013] In a second aspect, an embodiment of the present invention further provides a pressure stripping control method, using the pressure stripping device for producing amorphous thin strips, the control method comprises the following steps:

[0014] Step 1: After the high-frequency induction furnace is charged, the furnace pressure control valve is opened to charge inert protective gas through the smelting vent pipe, and the pressure in the high-frequency induction furnace is set to P1, and the added master alloy is melted in the inert protective gas environment to obtain a homogeneous alloy melt;

[0015] Step 2: Open the smelting control valve to allow the alloy melt to be injected into the intermediate insulation bag through the liquid guide pipe. After the alloy melt is completely injected, close the furnace pressure control valve and the smelting control valve;

[0016] Step 3, after opening the pressure control valve of the ladle body to adjust the pressure in the intermediate insulation ladle to within the preset pressure value P0 range, open the belt-swinging control valve, and the alloy melt contacts the rotating cooling roller after passing through the drainage pipe for belt-swinging;

[0017] Step 4: After the belt is spun off, the real-time detected pressure in the intermediate insulation bag is P2, ensuring that P2 is within the preset pressure value P0 range; wherein, the pressure value injected by opening the bag pressure control valve in step 3 is P2′, and the relationship between the two is P2=P2′+ρgh, ρ is the density of the alloy melt, and h is the liquid level height of the alloy melt in the intermediate insulation bag;

[0018] Step 5: As the liquid level in the intermediate insulation bag decreases, the pressure at the bottom of the intermediate insulation bag decreases. When P2<P0, the bag body pressure control valve is opened, and P2′ is used to compensate for the lost pressure. The compensated pressure is ΔP2′=ρgΔh. At this time, P2=P2′+ρgh+ΔP2′. P2 is kept within the preset pressure value range to keep the pressure constant during the belt throwing and ensure the uniform thickness of the amorphous thin strip.

[0019] Step six, when the alloy melt in the intermediate insulation bag is about to be used up, close the bag pressure control valve, reopen the smelting control valve, inject the alloy melt that has been pre-melted in the high-frequency induction furnace into the intermediate insulation bag, and open the furnace pressure control valve at the same time. Regulate the pressure P2 in the intermediate insulation bag through the furnace pressure control valve to stabilize it within the preset pressure value P0 range until the alloy melt is completely injected into the intermediate insulation bag; repeat step six to complete continuous production.

[0020] In combination with the second aspect, in one achievable manner, in step 1, the master alloy is first smelted, and the vacuum degree in the high-frequency induction furnace at the initial stage of smelting is 1×10 -3 Pa, the vacuum degree of the smelting process is lower than 0.01Pa, and the master alloy is repeatedly smelted to obtain a uniform master alloy; then the uniformly mixed master alloy is added into a high-frequency induction furnace and melted at 1300℃-1750℃ to obtain a homogeneous alloy melt.

[0021] In combination with the second aspect, in one achievable manner, in step two, the insulation temperature of the intermediate insulation bag is 1150°C-1450°C.

[0022] In combination with the second aspect, in one achievable manner, in step three, a transverse airflow is applied to the belt-swinging space between the drainage tube and the cooling roller, and the intensity of the transverse airflow is 5-20 ml / min.

[0023] In combination with the second aspect, in one achievable manner, in step six, the pressure value adjusted by the furnace pressure control valve is ΔP, ΔP=P2-P1, and ΔP is between 0.5-2 kPa.

[0024] Compared with the prior art, the pressure-spinning device and control method for producing amorphous thin strips provided by the present invention have the following beneficial effects: when the liquid level in the intermediate insulation bag drops and the pressure decreases, the pressure is compensated by the bag pressure control valve to keep the pressure value in the intermediate insulation bag stable within the preset pressure value range; when it is necessary to close the bag pressure control valve and open the smelting control valve to inject the alloy melt in the high-frequency induction furnace into the intermediate insulation bag, the pressure in the intermediate insulation bag is supplemented by the furnace pressure control valve to keep the pressure value in the intermediate insulation bag stable within the preset pressure value range; thereby, it can be ensured that during the continuous production of strip spinning, the alloy melt is in a stable pressure environment, thereby obtaining a thinner and more uniform amorphous thin strip, thereby improving the quality of the prepared amorphous thin strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a pressure strip-spinning device for producing amorphous thin strips provided in an embodiment of the present invention;

[0026] Figure 2 A control principle diagram of a pressure belt swing provided by an embodiment of the present invention;

[0027] Description of reference numerals:

[0028] 1. High-frequency induction furnace; 2. Furnace body pressure control valve; 3. Smelting ventilation pipe; 4. Furnace body fixed convex ring; 5. Furnace body buckle plate; 6. Terminal equipment; 7. Liquid guide pipe; 8. Smelting control valve; 9. Left support frame; 10. Right support frame; 11. Middle insulation bag; 12. Bag body pressure control valve; 13. Belt-swinging ventilation pipe; 14. Bag body fixed convex ring; 15. Bag body buckle plate; 16. Belt-swinging control valve; 17. Drainage pipe; 18. Cooling roller; 19. Cooling roller fixing plate; 20. Feeding cylinder; 21. Material receiving box; 22. Fixed bottom plate; 23. Amorphous thin strip. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] Please also read Figure 1 and Figure 2 The pressure strip-spinning device for producing amorphous thin strips provided by the present invention is now described. The pressure strip-spinning device for producing amorphous thin strips comprises: a high-frequency induction furnace 1, an intermediate insulation bag 11 and a cooling roller 18 arranged in sequence from top to bottom.

[0031] A smelting vent pipe 3 is provided at the top of the high-frequency induction furnace 1, and a furnace pressure control valve 2 is provided on the smelting vent pipe 3; a liquid guide pipe 7 is provided at the bottom of the high-frequency induction furnace 1, and a smelting control valve 8 is provided on the liquid guide pipe 7. Among them, a cover plate for feeding and sealing is provided on the high-frequency induction furnace 1; the smelting vent pipe 3 is connected to the gas cylinder. Optionally, the high-frequency induction furnace 1 is a cylinder with a diameter of 0.6m and a height of 0.5m, and the height of the bottom cone can be ignored.

[0032] The intermediate insulation bag 11 is arranged below the high-frequency induction furnace 1, and the liquid guide tube 7 extends into the intermediate insulation bag 11; the upper part of the intermediate insulation bag 11 is provided with a belt-swinging vent pipe 13, and the belt-swinging vent pipe 13 is provided with a bag body pressure control valve 12; the bottom of the intermediate insulation bag 11 is provided with a drainage pipe 17, and the drainage pipe 17 is provided with a belt-swinging control valve 16. Optionally, the intermediate insulation bag 11 is a cylinder with a diameter of 0.8m and a height of 0.6m, and the height of the bottom cone can be ignored. It should be noted that in the present application, the outlet plane of the lower end of the drainage pipe 17 is as parallel as possible to the plane of the tangent line at the top of the cooling roller 18, and the inclination angle of the outlet plane is not greater than 2°.

[0033] The cooling roller 18 is arranged below the middle insulation bag 11 and has a belt-swinging space with the lower end of the drainage pipe 17. The cooling roller 18 is supported by a cooling roller fixing plate 19. The interior of the cooling roller 18 is hollow and the cooling of the cooling roller 18 is achieved by a water cooling mechanism or an air cooling mechanism. Optionally, the cooling roller 18 is a hollow circular ring with a diameter of 0.4m and a thickness of 0.1m.

[0034] Among them, the furnace pressure control valve 2, the smelting control valve 8, the ladle pressure control valve 12 and the belt-spinning control valve 16 are all connected to the terminal device 6 through a line, and the terminal device 6 can be a terminal computer, a central control console, etc. The preset belt-spinning pressure value range in the intermediate insulation bag 11 and the rotation speed of the cooling roller 18 are set through the terminal device 6, and the pressure in the high-frequency induction furnace 1, the height of the alloy melt in the high-frequency induction furnace 1, the pressure in the intermediate insulation bag 11, the height of the alloy melt in the intermediate insulation bag 11 and the insulation temperature are monitored and adjusted.

[0035] In some embodiments, the bottom of the high-frequency induction furnace 1 is provided with a furnace body conical guide groove, the bottom of the intermediate insulation bag 11 is provided with a bag body conical guide groove, the liquid guide pipe 7 is provided at the bottom of the furnace body conical guide groove, and the drainage pipe 17 is provided at the bottom of the bag body conical guide groove. Among them, each conical guide groove is made of quartz or ceramic material, and the taper is 1.4:1, so as to ensure the collection and diversion of the alloy liquid to the bottom.

[0036] In some embodiments, the device also includes a feeding cylinder 20 and a receiving box 21 arranged in the material throwing direction of the cooling roller 18. The feeding cylinder 20 is inclined between the cooling roller 18 and the receiving box 21. The inclination angle of the feeding cylinder 20 is 5°-8°; the length of the feeding cylinder 20 is 2-3m.

[0037] In some embodiments, the distance between the lower end of the drainage tube 17 and the cooling roller 18 is 0.1-3 mm, which is reserved for the belt swinging. For example, the distance is 0.1 mm, 0.2 mm, 0.3 mm, 1 mm, 1.2 mm, 3 mm, etc.

[0038] In some embodiments, the device further comprises a bracket, a furnace body buckle plate 5 is arranged on the upper part of the bracket, a package body buckle plate 15 is arranged in the middle part of the bracket, a furnace body fixing convex ring 4 supported on the furnace body buckle plate 5 is arranged on the periphery of the high-frequency induction furnace 1, and a package body fixing convex ring 14 supported on the package body buckle plate 15 is arranged on the periphery of the intermediate insulation bag 11. The bracket comprises a fixed bottom plate 22 and a left support frame 9 and a right support frame 10 fixed on the fixed bottom plate 22, the left support frame 9 and the right support frame 10 support the high-frequency induction furnace 1 and the intermediate insulation bag 11, and the cooling roller fixing plate 19 supporting the cooling roller 18 is fixed on the fixed bottom plate 22.

[0039] An embodiment of the present invention also provides a control method for pressure stripping, using the pressure stripping device for producing amorphous thin strips. The rotation speed of the cooling roller 18 set by the present invention is 1000-7000r / min, and the preset stripping pressure value in the intermediate insulation bag 11 is 200kPa.

[0040] The embodiments of the control method are as follows:

[0041] Example 1

[0042] Step 1: Fe, Si and B with a purity of 99.98% are mixed according to the molecular formula Fe 75 Si 15 B 10 The ingredients are batched, and the powder particle size is 5-8μm;

[0043] The prepared raw materials were poured into a corundum crucible with a purity of 99% and smelted in a high-frequency induction furnace. The vacuum degree in the furnace was 1×10 -3 Pa, the vacuum degree during the smelting process was lower than 0.01Pa. To ensure the uniform composition of the master alloy, it was smelted repeatedly for 7 times.

[0044] Open the terminal device 6, add the smelted master alloy into the high-frequency induction furnace 1, close the cover on the high-frequency induction furnace 1, melt the master alloy in an inert protective gas environment, and obtain a homogeneous alloy melt at a melting temperature of 1450°C-1750°C.

[0045] Step 2, open the smelting control valve 8, inject the alloy melt in the high-frequency induction furnace 1 into the intermediate insulation bag 11 through the liquid guide pipe 7, and heat and keep it warm under the action of the induction coil, and the insulation temperature is 1450℃-1500℃.

[0046] Step three, open and set the speed of the cooling roller 18 to 1500 r / min, and set the preset pressure value in the intermediate insulation bag 11 required by the process to 200 kPa.

[0047] Step 4: After the pressure in the intermediate insulation bag 11 reaches the preset pressure value by opening the bag body pressure control valve 12, the belt-swinging control valve 16 is opened, and the alloy melt passes through the drainage pipe 17 and contacts the cooling roller 18 for belt-swinging. In the belt-swinging space between the bottom of the drainage pipe 17 and the cooling roller 18, the lateral airflow intensity to which the alloy melt is subjected is in the range of 5-15 ml / min. At the same time, the terminal device 6 also detects and keeps P2 stable at 200 kPa in real time.

[0048] Step five, as the liquid level in the middle insulation bag 11 decreases, the bottom pressure will decrease. In order to keep the pressure constant during belt swinging, the bag body pressure control valve 12 is used to inject inert protective gas with a pressure of P2′ through the belt swinging vent pipe 13 to compensate for the lost pressure and increase the pressure in the bag. The compensation pressure is ΔP2′=ρgΔh. At this point, P2=P2′+ρgh+ΔP2′, keeping P2 at around 200 kPa to ensure uniform thickness of the amorphous thin strip.

[0049] Step six, when the molten liquid in the intermediate insulation bag 11 is about to be used up, reopen the smelting control valve 8, and inject the pre-smelted alloy melt into the intermediate insulation bag 11. In this process, first close the bag pressure control valve 12, and then open the furnace pressure control valve 2. The furnace pressure control valve 2 is controlled to stabilize P2 at around 200 kPa. At the same time, to ensure the smooth flow of the molten liquid, ΔP (ΔP=P2-P1, P1 is the pressure value adjusted by the furnace pressure control valve) is controlled within 1-2 kPa until the alloy melt is completely injected into the intermediate insulation bag 11; after opening the bag pressure control valve 12, close the smelting control valve 8 and the furnace pressure control valve 2. Keep P2 stable throughout the process, and repeat step six to complete continuous production.

[0050] Step seven, the amorphous thin strip obtained by pressure spinning is recooled by the feeding cylinder 20 and enters the receiving box 21, so that a continuous amorphous thin strip 23 can be obtained, and its thickness is uniform and stable at about 10 μm.

[0051] Example 2

[0052] Step 1: Fe, Si, B, Ni, Cu, W, and Mn single-element raw materials with a purity of 99.98% are mixed according to the molecular formula Fe 92.8 Si 2.2 B3 0.8 Cu 0.8 W 0.2 Mn 0.2 The ingredients are batched, and the powder particle size is 8-10μm;

[0053] The prepared raw materials were poured into a corundum crucible with a purity of 99% and smelted in a high-frequency induction furnace. The vacuum degree in the furnace was 1×10 -3 Pa, the vacuum degree during the smelting process was lower than 0.01Pa. To ensure the uniform composition of the master alloy, it was smelted repeatedly for 7 times.

[0054] Open the terminal device 6, add the obtained master alloy into the high-frequency induction furnace 1, close the cover plate above the high-frequency induction furnace 1, and melt the master alloy in an inert protective gas environment at a melting temperature of 1350°C-1450°C to obtain a homogeneous alloy melt.

[0055] Step 2, open the smelting control valve 8, inject the alloy melt in the high-frequency induction furnace 1 into the intermediate insulation bag 11 through the liquid guide pipe 7, and heat and keep warm under the action of the induction coil. Since copper is volatile, the insulation temperature is set to 1150℃-1250℃.

[0056] Step three, because the Fe content in the component alloy is high and the amorphous forming ability is weak, the speed of the cooling roller 18 should be relatively increased. The speed of the cooling roller 18 is set to 2500r / min, and the preset pressure value in the intermediate insulation bag 11 required by the process is set to 200kPa.

[0057] Step 4: After the pressure in the intermediate insulation bag 11 reaches the preset pressure value by opening the bag body pressure control valve 12, the belt-swinging control valve 16 is opened, and the alloy melt passes through the drainage pipe 17 and contacts the cooling roller 18 for belt-swinging. The lateral airflow intensity of the alloy melt in the free space between the bottom of the drainage pipe 17 and the cooling roller 18 is in the range of 10-20 ml / min. In addition, the terminal device 6 also detects and keeps P2 stable at 200 kPa in real time.

[0058] Step five, as the liquid level in the middle insulation bag 11 decreases, the bottom pressure will decrease. In order to keep the pressure constant during belt swinging, it is necessary to inject a pressure value P2′ through the belt swinging vent pipe 13 to compensate for the lost pressure and increase the pressure to ΔP2′=ρgΔh. At this point, P2=P2′+ρgh+ΔP2′, ensuring the uniform thickness of the amorphous thin strip and keeping P2 at around 200 kPa.

[0059] Step six, when the alloy melt in the intermediate insulation bag 11 is about to be used up, reopen the smelting control valve 8, and inject the pre-smelted alloy melt into the intermediate insulation bag 11. In this process, first close the bag pressure control valve 12, and then open the furnace pressure control valve 2. The furnace pressure control valve 2 is controlled to stabilize P2 at around 200 kPa. At the same time, to ensure the smooth flow of the molten metal, ΔP (ΔP=P2-P1) is controlled within 1.2-2 kPa until the alloy melt is completely injected into the intermediate insulation bag 11; then open the bag pressure control valve 12, and then close the smelting control valve 8 and the furnace pressure control valve 2. Keep P2 stable throughout the process, and repeat step six to complete continuous production.

[0060] Step seven, the obtained amorphous thin strip 23 enters the receiving box 21 through re-cooling of the feeding cylinder 20, and a continuous amorphous thin strip 23 can be obtained, and its thickness is uniform and stable at about 11 μm.

[0061] Example 3

[0062] Step 1: Fe, Si, B, Cr, Mo, Ni, Al, and W single-element raw materials with a purity of 99.98% are mixed according to the molecular formula Fe 88.4 Si4B6Cr 0.5Mo 0.2 Ni 0.2 Al 0.2 W 0.5 The ingredients are batched, and the powder particle size is 8-10μm;

[0063] The prepared raw materials were poured into a corundum crucible with a purity of 99% and smelted in a high-frequency induction furnace. The vacuum degree in the furnace was 1×10 -3 Pa, the vacuum degree during the smelting process was lower than 0.01Pa. To ensure the uniform composition of the master alloy, it was smelted repeatedly for 7 times.

[0064] Open the terminal device 6, add the obtained master alloy into the high-frequency induction furnace 1, close the sealing cover plate above the high-frequency induction furnace 1, melt the master alloy in an inert protective gas environment, and obtain a homogeneous alloy melt at a melting temperature of 1400°C-1650°C.

[0065] Step 2, open the smelting control valve 8, inject the alloy melt in the high-frequency induction furnace 1 into the intermediate insulation bag 11 through the liquid guide pipe 7, and heat and keep it warm under the action of the induction coil, and the insulation temperature is 1450℃-1500℃.

[0066] Step three, set the rotation speed of the cooling roller 18 to 2000r / min, and set the preset pressure value in the intermediate insulation bag 11 required by the process to 200kPa.

[0067] Step 4: After the pressure in the intermediate insulation bag 11 reaches the preset pressure value by opening the bag body pressure control valve 12, the belt-swinging control valve 16 is opened, and the alloy melt passes through the drainage pipe 17 and contacts the cooling roller 18 for belt-swinging. The lateral airflow intensity of the alloy melt in the belt-swinging space between the bottom of the drainage pipe 17 and the cooling roller 18 is in the range of 8-20 ml / min. In addition, the terminal device 6 also detects and keeps P2 stable at 200 kPa in real time.

[0068] Step five, as the liquid level in the middle insulation bag 11 decreases, the bottom pressure will decrease. In order to keep the pressure constant when the belt is swung, the pressure value P2′ adjusted by the bag pressure control valve 12 is used to compensate for the lost pressure, and the pressure value is increased to ΔP2′=ρgΔh. At this point, P2=P2′+ρgh+ΔP2′, ensuring the uniform thickness of the amorphous thin strip and keeping P2 at around 200kPa.

[0069] Step six, when the molten liquid in the intermediate insulation bag 11 is about to be used up, reopen the smelting control valve 8, and inject the pre-smelted alloy melt into the intermediate insulation bag 11. In this process, first close the bag body pressure control valve 12, and then open the furnace body pressure control valve 2. By controlling the furnace body pressure control valve 2, P2 is stabilized at around 200 kPa. At the same time, to ensure the smooth flow of the molten liquid, ΔP (ΔP=P2-P1) is controlled within 0.8-1.6 kPa until the alloy melt is completely injected into the intermediate insulation bag 11; then open the bag body pressure control valve 12, and then close the smelting control valve 8 and the furnace body pressure control valve 2. Keep P2 stable throughout the process, and repeat step six to complete continuous production.

[0070] Step seven, the amorphous thin strip 23 obtained by pressure spinning is recooled by the feeding cylinder 20 and enters the receiving box 21, so that a continuous amorphous thin strip 23 can be obtained, and its thickness is uniform and stable at about 15μm.

[0071] Example 4

[0072] Step 1: Fe, Si, B, P, C, and Cu with a purity of 99.98% are mixed according to the molecular formula Fe 85.4 Si3B 5.2 P 3.8 C 1.6 Cu1 is used for batching, and the powder particle size is 5-8μm;

[0073] The prepared raw materials were poured into a corundum crucible with a purity of 99% and smelted in a high-frequency induction furnace. The vacuum degree in the furnace was 1×10 -3 Pa, the vacuum degree during the smelting process was lower than 0.01Pa. To ensure the uniform composition of the master alloy, it was smelted repeatedly for 7 times.

[0074] The obtained master alloy is added into the high-frequency induction furnace 1, the sealing cover plate above the high-frequency induction furnace 1 is closed, and the master alloy is melted in an inert protective gas environment at a melting temperature of 1300-1450° C. to obtain a homogeneous alloy melt.

[0075] Step 2, open the smelting control valve 8, inject the alloy melt in the high-frequency induction furnace 1 into the intermediate insulation bag 11 through the liquid guide pipe 7, and heat and keep warm under the action of the induction coil. Therefore, the Cu content in the component alloy is higher than that in Example 2, so the insulation temperature is set to 1200°C-1300°C.

[0076] Step three, open and set the speed of the cooling roller 18 to 2000 r / min, and set the preset pressure value in the intermediate insulation bag 11 required by the process to 200 kPa.

[0077] Step 4: After the pressure in the intermediate insulation bag 11 reaches the preset pressure value by opening the bag body pressure control valve 12, the belt-swinging control valve 16 is opened, and the alloy melt passes through the drainage pipe 17 and contacts the cooling roller 18 for belt-swinging. The lateral airflow intensity of the alloy melt in the belt-swinging space between the bottom of the drainage pipe 17 and the cooling roller 18 is in the range of 6-20 ml / min. In addition, P2 is detected in real time and kept stable at 200 kPa.

[0078] Step five, as the liquid level in the middle insulation bag 11 decreases, the bottom pressure will be reduced. In order to keep the pressure constant during belt swinging, the pressure P2′ is injected through the belt swinging vent pipe 13 to compensate for the lost pressure, and the pressure value is increased to ΔP2′=ρgΔh. At this point, P2=P2′+ρgh+ΔP2′, ensuring the uniform thickness of the amorphous thin strip and keeping P2 at around 200kPa.

[0079] Step six, when the alloy melt in the intermediate insulation bag 11 is about to be used up, reopen the smelting control valve 8, and inject the pre-smelted alloy melt into the intermediate insulation bag 11. In this process, first close the bag pressure control valve 12, and then open the furnace pressure control valve 2. By controlling the furnace pressure control valve 2, P2 is stabilized at around 200kPa. At the same time, to ensure the smooth flow of the alloy melt, ΔP (ΔP=P2-P1) is controlled within 1-2kPa until the alloy melt is completely injected into the intermediate insulation bag 11; then open the bag pressure control valve 12, close the smelting control valve 8 and the furnace pressure control valve 2, and open the belt throwing control valve 16 to throw the belt. Keep P2 stable throughout the process, and repeat step six to complete continuous production.

[0080] Step seven, the amorphous thin strip 23 obtained by pressure spinning is recooled by the feeding cylinder 20 and enters the receiving box 21, so that a continuous amorphous thin strip 23 can be obtained, and its thickness is uniform and stable at about 12μm.

[0081] Table 1 shows the thickness comparison between the amorphous thin ribbon obtained in the embodiment of the present invention and the amorphous thin ribbon obtained by the existing gravity strip throwing device.

[0082] Table 1 Thickness values ​​of amorphous thin strips obtained by the present invention and amorphous thin strips obtained by existing devices

[0083]

[0084] It can be seen from Table 1 that the thickness of existing products varies greatly and is uneven, while the present invention can obtain an amorphous thin strip with uniform thickness.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure belt control method, characterized in that: The control method comprises the following steps: Step 1: Fe, Si and B with a purity of 99.98% are mixed according to the molecular formula Fe 75 Si 15 B 10 The powder particle size is 5-8μm; or Fe, Si, B, Ni, Cu, W, Mn single-substance raw materials with a purity of 99.98% are selected according to the molecular formula Fe 92.8 Si 2.2 B3 0.8 Cu 0.8 W 0.2 Mn 0.2 The powder particle size is 8-10μm; or Fe, Si, B, Cr, Mo, Ni, Al, W single-substance raw materials with a purity of 99.98% are selected according to the molecular formula Fe 88.4 Si4B6Cr 0.5 Mo 0.2 Ni 0.2 Al 0.2 W 0.5 The powder particle size is 8-10μm; or Fe, Si, B, P, C, Cu with a purity of 99.98% are selected according to the molecular formula Fe 85.4 Si3B 5.2 P 3.8 C 1.6 Cu1 is used for batching, and the powder particle size is 5-8μm; The prepared raw materials were poured into a corundum crucible with a purity of 99% and smelted in a high-frequency induction furnace. The vacuum degree in the furnace was 1×10 -3 Pa, the vacuum degree during the smelting process was lower than 0.01Pa. To ensure the uniform composition of the master alloy, it was smelted repeatedly for 7 times. When the high-frequency induction furnace is charged with materials, the furnace pressure control valve is opened to charge inert protective gas through the smelting vent pipe, and the pressure in the high-frequency induction furnace is set to P1. The added master alloy is melted in the inert protective gas environment to obtain a homogeneous alloy melt; Step 2: Open the smelting control valve to allow the alloy melt to be injected into the intermediate insulation bag through the liquid guide pipe. After the alloy melt is completely injected, close the furnace pressure control valve and the smelting control valve; Step 3, after opening the pressure control valve of the ladle body to adjust the pressure in the intermediate insulation ladle to within the preset pressure value P0 range, open the belt-swinging control valve, and the alloy melt contacts the rotating cooling roller after passing through the drainage pipe for belt-swinging; Step 4: After the belt is spun off, the real-time detected pressure in the intermediate insulation bag is P2, ensuring that P2 is within the preset pressure value P0 range; wherein, the pressure value injected by opening the bag pressure control valve in step 3 is P2′, and the relationship between the two is P2=P2′+ρgh, ρ is the density of the alloy melt, and h is the liquid level height of the alloy melt in the intermediate insulation bag; Step 5: As the liquid level in the intermediate insulation bag decreases, the pressure at the bottom of the intermediate insulation bag decreases. When P2<P0, the bag body pressure control valve is opened, and P2′ is used to compensate for the lost pressure. The compensated pressure is ΔP2′=ρgΔh. At this time, P2=P2′+ρgh+ΔP2′. P2 is kept within the preset pressure value range to keep the pressure constant during the belt throwing and ensure the uniform thickness of the amorphous thin strip. Step 6: When the alloy melt in the intermediate insulation bag is about to be used up, close the bag pressure control valve, reopen the smelting control valve, inject the alloy melt that has been pre-melted in the high-frequency induction furnace into the intermediate insulation bag, and open the furnace pressure control valve at the same time. The pressure P2 in the intermediate insulation bag is adjusted by the furnace pressure control valve to stabilize within the preset pressure value P0 range until the alloy melt is completely injected into the intermediate insulation bag; repeat step 6 to complete continuous production; The control method is based on a pressure strip-spinning device for producing amorphous thin strips, comprising: A high-frequency induction furnace (1), wherein a smelting vent pipe (3) is arranged at the top of the high-frequency induction furnace (1), and a furnace pressure control valve (2) is arranged on the smelting vent pipe (3); a liquid guide pipe (7) is arranged at the bottom of the high-frequency induction furnace (1), and a smelting control valve (8) is arranged on the liquid guide pipe (7); a furnace body conical guide groove is arranged at the bottom of the high-frequency induction furnace (1), and a bag body conical guide groove is arranged at the bottom of the intermediate insulation bag (11), and the taper is 1.4:1; An intermediate heat-insulating bag (11) is arranged below the high-frequency induction furnace (1), and the liquid guide pipe (7) extends into the intermediate heat-insulating bag (11); a belt-swinging vent pipe (13) is arranged on the upper part of the intermediate heat-insulating bag (11), and a bag body pressure control valve (12) is arranged on the belt-swinging vent pipe (13); a drainage pipe (17) is arranged on the bottom of the intermediate heat-insulating bag (11), and a belt-swinging control valve (16) is arranged on the drainage pipe (17); and The cooling roller (18) is arranged below the intermediate heat-insulating bag (11) and has a belt-swinging space with the lower end of the drainage pipe (17).

2. The pressure belt control method according to claim 1, characterized in that: The bottom of the high-frequency induction furnace (1) is provided with a furnace body conical guide groove, the bottom of the intermediate insulation bag (11) is provided with a bag body conical guide groove, the liquid guide pipe (7) is provided at the bottom of the furnace body conical guide groove, and the drainage pipe (17) is provided at the bottom of the bag body conical guide groove.

3. The control method of the pressure belt as claimed in claim 1, characterized in that: It also includes a feeding cylinder (20) and a material receiving box (21) which are arranged in the material throwing direction of the cooling roller (18); the feeding cylinder (20) is inclined between the cooling roller (18) and the material receiving box (21); and the inclination angle of the feeding cylinder (20) is 5°-8°.

4. The control method of the pressure belt throwing as claimed in claim 1, characterized in that: The distance of the belt-swinging space between the drainage tube (17) and the cooling roller (18) is 0.1-3 mm.

5. The control method of the pressure belt throwing as claimed in claim 1, characterized in that: The invention also comprises a bracket, wherein a furnace body buckle plate (5) is arranged on the upper part of the bracket, a package body buckle plate (15) is arranged in the middle part of the bracket, and a furnace body fixing convex ring (4) supported on the furnace body buckle plate (5) is arranged on the outer periphery of the high-frequency induction furnace (1); and a package body fixing convex ring (14) supported on the package body buckle plate (15) is arranged on the outer periphery of the intermediate heat-insulating package (11).

6. The control method of the pressure belt throwing as claimed in claim 1, characterized in that: In step 1, the master alloy is first smelted. The vacuum degree in the high-frequency induction furnace is 1×10 -3 Pa, the vacuum degree of the smelting process is lower than 0.01Pa, and the master alloy is repeatedly smelted to obtain a uniform master alloy; then the uniformly mixed master alloy is added into a high-frequency induction furnace and melted at 1300℃-1750℃ to obtain a homogeneous alloy melt.

7. The control method of the pressure belt throwing as claimed in claim 1 is characterized in that: In step 2, the insulation temperature of the middle insulation bag is 1150°C-1450°C.

8. The control method of the pressure belt throwing as claimed in claim 1, characterized in that: In step three, a transverse airflow is applied to the belt-swinging space between the drainage tube and the cooling roller, and the intensity of the transverse airflow is 5-20 ml / min.

9. The control method of the pressure belt throwing as claimed in claim 1, characterized in that: In step six, the pressure value adjusted by the furnace pressure control valve is ΔP, ΔP=P2-P1, and ΔP is between 0.5-2kPa.

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