A furnace annealing method for precision stainless steel strip

Abstract

The present invention discloses a method for annealing precision stainless steel strips in a furnace, and relates to the technical field of heat treatment of stainless steel strips. The method for annealing precision stainless steel strips in a furnace is applied with a vacuum annealing furnace, which includes a furnace body, a vacuum pump provided on the side of the furnace body, an external trolley assembly provided on the bottom of the furnace body, an inner cavity provided inside the support base, and one end side of the inner cavity is connected to a first pump body through a first oil pipe, and the other end side of the inner cavity is connected to a second pump body through a second oil pipe. In the method for annealing precision stainless steel strips in a furnace, only the loading rod, the penetration rod and the disc are located inside the furnace body during the annealing process, and the oil required for the penetration rod to extend is in a flowing state, thereby eliminating the problem of the hydraulic trolley oil being easily deteriorated due to long-term heating. At the same time, the stainless steel strip moves synchronously with the furnace door, so that the stainless steel strip can be quickly taken out after the annealing process.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment of stainless steel strips, in particular to a furnace annealing method for precision stainless steel strips. Background Art

[0002] During the production process of precision stainless steel strips, the stainless steel strips are placed in a vacuum annealing furnace. After closing the furnace door, the vacuum pump is started to pump the pressure in the furnace to a certain vacuum degree, generally reaching - Then, the stainless steel is heated to a temperature between 700 and 1100°C, depending on the type and performance of the stainless steel. After a period of heat preservation, the steel is cooled. Furnace cooling or rapid cooling can be used, and the vacuum state in the furnace is maintained during the cooling process.

[0003] When annealing stainless steel strips in existing vacuum annealing furnaces, the stainless steel strips are usually placed on a trolley so that the trolley can carry the strips out of the furnace after annealing. However, the trolley is heated together with the stainless steel strips in the furnace, making the circuits, motors, electronic components and other parts inside the electric trolley prone to aging, overheating and failure. The hydraulically driven trolley is easily heated for a long time, which can cause the oil to deteriorate, reduce viscosity or reduce sealing. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method for annealing precision stainless steel strips in a furnace, which solves the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for annealing a precision stainless steel strip in a furnace, the method comprising the following steps:

[0006] Step 1: The stainless steel strip to be annealed is coiled and placed on the surface of the carrier rod;

[0007] Step 2: The solenoid valve is opened, and the first pump body injects oil into the inner cavity outside the furnace body. The oil passes through the solenoid valve, the hollow telescopic rod, and the third pump body in sequence and enters the interior of the loading rod, thereby pushing the penetrating rod outward to firmly clamp the stainless steel strip from the inside to the outside. The oil circulates;

[0008] Step 3: The second pump body injects oil into the inner cavity outside the furnace body, causing the piston end carrying the hollow telescopic rod to retract into the inner cavity, thereby closing the furnace door and the furnace body. At this time, only the loading rod, the penetration rod and the disc are inside the furnace body;

[0009] Step 4: The vacuum pump is started to evacuate the furnace body to a vacuum state, and then the temperature inside the furnace body is increased to anneal the stainless steel strip;

[0010] Step 5: During the annealing process, the drive motor located outside the furnace door drives the drive gear to rotate the inner gear ring carrying the loading rod, so that the stainless steel strip rotates and is evenly heated;

[0011] Step 6: After annealing is completed, the first pump body injects oil into the inner cavity. At this time, the solenoid valve is closed, causing the hollow telescopic rod to carry the furnace door outward. While the furnace door moves outward, it also carries the annealed stainless steel strip out of the furnace body. Finally, the solenoid valve is opened and the third pump body discharges the oil inside the loading rod into the inner cavity, so that the piercing rod releases its grip on the stainless steel strip.

[0012] Furthermore, the in-furnace annealing method for the precision stainless steel strip is applied with a vacuum annealing furnace, which includes a furnace body, a vacuum pump is provided on the side of the furnace body, and an external trolley assembly is provided at the bottom of the furnace body.

[0013] Furthermore, the external trolley assembly includes a support base, an inner cavity, a first oil pipe, a second oil pipe, a first pump body and a second pump body. The support base is provided with an inner cavity, and one end side of the inner cavity is connected to the first pump body through the first oil pipe, and the other end side of the inner cavity is connected to the second pump body through the second oil pipe.

[0014] Furthermore, the external trolley assembly also includes a piston end, a solenoid valve and a hollow telescopic rod. The piston end is provided inside the inner cavity, and the solenoid valve is embedded inside the piston end. The hollow telescopic rod is fixed to the end face of the piston end.

[0015] Furthermore, the external trolley assembly also includes a furnace door and support wheels. The furnace door is fixed to the end of the hollow telescopic rod away from the piston end, and support wheels are provided on both sides of the bottom of the furnace door.

[0016] Furthermore, the external trolley assembly also includes a disc, a loading rod and a penetration rod. The furnace door is rotatably connected to the side of the furnace body, and the loading rod is fixed to the side of the disc. The outer wall of the loading rod is ring-shaped and evenly penetrated with the penetration rod.

[0017] Furthermore, the external trolley assembly also includes a pipe bearing, a connecting pipe, and a third pump body. The middle part of the side of the disc close to the furnace door is rotatably connected to the connecting pipe through the pipe bearing, and the bottom of the connecting pipe is connected to the third pump body.

[0018] Furthermore, the bottom of the third pump body is connected to an end of the hollow telescopic rod away from the piston end, and the loading rod is connected to the hollow telescopic rod through the connecting pipe and the third pump body.

[0019] Furthermore, an inner gear ring is provided at an edge of one side of the disc close to the furnace door, and a strip rotating assembly is provided on the inner side of the inner gear ring.

[0020] Furthermore, the strip rotating assembly includes a driving gear and a driving motor. The driving gear is meshed with the inner gear ring, and the driving motor is connected to the surface of the driving gear.

[0021] The present invention provides a furnace annealing method for precision stainless steel strip, which has the following beneficial effects:

[0022] 1. In this method of in-furnace annealing of precision stainless steel strip, only the loading rod, threading rod, and disc are located inside the furnace during annealing. The oil required for the threading rod to extend is kept flowing, eliminating the problem of oil deterioration caused by prolonged heating in hydraulic trolleys. Simultaneously, the stainless steel strip moves synchronously with the furnace door, allowing for quick removal of the strip after annealing.

[0023] 2. This furnace annealing method for precision stainless steel strip uses an outwardly extending through-rod to stably support the strip during annealing. A drive motor drives the drive gear, causing the internal gear ring to rotate along with the carrier rod, allowing the stainless steel strip to rotate and be evenly heated. Furthermore, the outward extension of the through-rod creates a gap between the interior of the stainless steel strip and the outer wall of the carrier rod, facilitating heat entry and simultaneously heating the strip from the inside out. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of a method for annealing a precision stainless steel strip in a furnace according to the present invention after the furnace door is moved outward;

[0025] Figure 2 This is a structural schematic diagram of a method for annealing a precision stainless steel strip in a furnace according to the present invention when the furnace door and the furnace body are closed;

[0026] Figure 3 This is a schematic diagram of the meshing connection structure between an internal gear ring and a driving gear in a method for furnace annealing of a precision stainless steel strip according to the present invention;

[0027] Figure 4 This is a schematic diagram of the internal structure of the inner cavity of a method for annealing a precision stainless steel strip in a furnace according to the present invention;

[0028] Figure 5 This is a schematic diagram of the double-channel cross-sectional structure at the top of a connecting pipe in a method for in-furnace annealing of a precision stainless steel strip according to the present invention.

[0029] In the figure: 1. furnace body; 2. vacuum pump; 3. external trolley assembly; 301. support base; 302. inner cavity; 303. first oil pipe; 304. second oil pipe; 305. first pump body; 306. second pump body; 307. piston end; 308. solenoid valve; 309. hollow telescopic rod; 310. furnace door; 311. support wheel; 312. disc; 313. loading rod; 314. penetration rod; 315. pipeline bearing; 316. connecting pipe; 317. third pump body; 4. inner gear ring; 5. strip rotation assembly; 501. drive gear; 502. drive motor. DETAILED DESCRIPTION

[0030] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0031] like Figure 1-Figure 5 As shown, the present invention provides a technical solution: a method for annealing a precision stainless steel strip in a furnace, the method comprising the following steps:

[0032] Step 1: The stainless steel strip to be annealed is coiled and placed on the surface of the carrier rod 313;

[0033] Step 2: The solenoid valve 308 is opened, and the first pump body 305 injects oil into the inner cavity 302 outside the furnace body 1. The oil passes through the solenoid valve 308, the hollow telescopic rod 309, and the third pump body 317 in sequence, and then enters the interior of the loading rod 313, pushing the penetrating rod 314 outward to firmly clamp the stainless steel strip from the inside out. The oil circulates;

[0034] Step 3: The second pump body 306 injects oil into the inner cavity 302 outside the furnace body 1, causing the piston end 307 carrying the hollow telescopic rod 309 to retract into the inner cavity 302, thereby closing the furnace door 310 and the furnace body 1. At this time, only the loading rod 313, the penetration rod 314 and the disc 312 are inside the furnace body 1;

[0035] Step 4: The vacuum pump 2 is started to evacuate the furnace body 1 to a vacuum state, and then the temperature inside the furnace body 1 is increased to anneal the stainless steel strip;

[0036] Step 5: During the annealing process, the drive motor 502 located outside the furnace door 310 drives the drive gear 501 to rotate the inner gear ring 4 carrying the loading rod 313, so that the stainless steel strip rotates and is evenly heated;

[0037] Step 6: After annealing is completed, the first pump body 305 injects oil into the inner cavity 302. At this time, the solenoid valve 308 is closed, so that the hollow telescopic rod 309 carries the furnace door 310 outward. While the furnace door 310 moves outward, it also carries the annealed stainless steel strip out of the furnace body 1. Finally, the solenoid valve 308 is opened and the third pump body 317 discharges the oil in the loading rod 313 into the inner cavity 302, so that the piercing rod 314 releases the clamping of the stainless steel strip.

[0038] like Figure 1-Figure 3 As shown, the method for annealing precision stainless steel strip in the furnace is applied with a vacuum annealing furnace, which includes a furnace body 1, a vacuum pump 2 is provided on the side of the furnace body 1, an external trolley assembly 3 is provided at the bottom of the furnace body 1, and the external trolley assembly 3 includes a support base 301, an inner cavity 302, a first oil pipe 303, a second oil pipe 304, a first pump body 305 and a second pump body 306. The inner cavity 302 is opened inside the support base 301, and one end side of the inner cavity 302 is passed through the first pump body 306. An oil pipe 303 is connected to a first pump body 305, and the other end side of the inner cavity 302 is connected to a second pump body 306 through a second oil pipe 304. The external trolley assembly 3 also includes a piston end 307, a solenoid valve 308 and a hollow telescopic rod 309. The inner cavity 302 is provided with a piston end 307, and the solenoid valve 308 is embedded in the piston end 307. The end surface of the piston end 307 is fixed with a hollow telescopic rod 309. The external trolley assembly 3 also includes a furnace door 310 and The support wheel 311, the end of the hollow telescopic rod 309 away from the piston end 307 is fixed with the furnace door 310, and the bottom two sides of the furnace door 310 are provided with support wheels 311, the external trolley assembly 3 also includes a disc 312, a loading rod 313 and a penetration rod 314, the furnace door 310 is rotatably connected to the side of the furnace body 1 with the disc 312, and the side of the disc 312 is fixed with the loading rod 313, the outer wall of the loading rod 313 is evenly penetrated with the penetration rod 314 in a ring shape, and the external trolley Component 3 also includes a pipe bearing 315, a connecting pipe 316, and a third pump body 317. The middle portion of the disc 312 near the furnace door 310 is rotatably connected to the connecting pipe 316 via the pipe bearing 315. The bottom of the connecting pipe 316 is connected to the third pump body 317. The bottom of the third pump body 317 is connected to the end of the hollow telescopic rod 309 away from the piston end 307. The loading rod 313 is connected to the hollow telescopic rod 309 via the connecting pipe 316 and the third pump body 317.

[0039] The specific operation is as follows: first, the solenoid valve 308 is closed, and the first pump body 305 injects oil into the inner cavity 302 along the first oil pipe 303. The oil pushes the piston end 307 to extend the hollow telescopic rod 309, thereby moving the furnace door 310 away from the furnace body 1;

[0040] The coiled stainless steel strip to be annealed is then placed on the surface of the carrier rod 313. At this time, the solenoid valve 308 is opened, and the first pump body 305 continues to inject oil into the inner cavity 302. The excess oil passes through the solenoid valve 308, the hollow telescopic rod 309, and the third pump body 317 in sequence before entering the interior of the carrier rod 313, pushing the penetrating rod 314 outward to firmly clamp the stainless steel strip from the inside out.

[0041] The first pump body 305 operates in reverse to pump out the oil in the inner cavity 302, while the second pump body 306 injects oil into the inner cavity 302 along the second oil pipe 304, causing the piston end 307 to retract with the hollow telescopic rod 309, thereby moving the furnace door 310 to close with the furnace body 1, thereby feeding the stainless steel strip into the furnace body 1. When the furnace door 310 moves, the support wheels 311 can improve stability and prevent the hollow telescopic rod 309 from bearing excessive weight.

[0042] The vacuum pump 2 is started to evacuate the furnace body 1 to a vacuum state, and then the temperature inside the furnace body 1 is increased to anneal the stainless steel strip. After the annealing is completed, the first pump body 305 injects oil into the inner cavity 302. At this time, the solenoid valve 308 is closed, causing the hollow telescopic rod 309 to move outward with the furnace door 310. The furnace door 310 moves outward and simultaneously moves the annealed stainless steel strip out of the furnace body 1. Finally, the solenoid valve 308 is opened, and the third pump body 317 discharges the oil in the loading rod 313 into the inner cavity 302, causing the threading rod 314 to release the grip on the stainless steel strip.

[0043] Two hollow telescopic rods 309 are provided, and the inner cavities 302 are connected by electronic valves. The top of the connecting pipe 316 is a double-channel design and the bottom is a double-tube design. One hollow telescopic rod 309 is an oil inlet pipe, and the other hollow telescopic rod 309 is an oil outlet pipe. The solenoid valves 308 at the ends of the two hollow telescopic rods 309 are closed. When the electronic valve between the inner cavities 302 is opened, the first pump body 305 injects oil to make the hollow telescopic rod 309 extend outward, and when the solenoid valve 308 is opened and the inner cavity 302 is opened, the oil is injected into the first pump body 305. When the electronic valve is closed, oil enters the interior of the material carrying rod 313 along any channel at the top of the oil inlet pipe or the connecting pipe 316. As the subsequent oil is injected into the interior of the material carrying rod 313, the oil enters the oil outlet pipe along another channel inside the connecting pipe 316, and finally returns to the inner cavity 302. In the inner cavity 302, a pipe with a valve and a pump body are provided near the end of the oil outlet pipe. The pump body is used to extract the oil discharged from the oil outlet pipe and return it to the oil tank for cooling. The valve is closed when the hollow telescopic rod 309 needs to be extended.

[0044] Therefore, during the annealing process, the oil is in a flowing state inside the carrier rod 313, thereby preventing the oil from being deteriorated due to long-term heating;

[0045] Based on the above description, in the present invention, only the loading rod 313, the penetration rod 314 and the disc 312 are located inside the furnace body 1 during the annealing treatment, and the oil required for the penetration rod 314 to extend is in a flowing state, thereby eliminating the problem of the hydraulic trolley oil being easily deteriorated due to long-term heating. At the same time, the stainless steel strip moves synchronously with the furnace door 310, so that the stainless steel strip can be quickly removed after annealing treatment.

[0046] like Figure 1-Figure 5 As shown, an inner gear ring 4 is provided at one edge of the disc 312 near the furnace door 310, and a strip rotating assembly 5 is provided inside the inner gear ring 4. The strip rotating assembly 5 includes a driving gear 501 and a driving motor 502. The driving gear 501 is meshed and connected with the inner gear ring 4, and the driving motor 502 is connected to the surface of the driving gear 501.

[0047] The specific operation is as follows: during the annealing treatment, the penetration rod 314 extends outward to stably support the stainless steel strip, and the driving motor 502 drives the driving gear 501 to make the inner gear ring 4 carry the loading rod 313 to rotate, so that the stainless steel strip rotates and is evenly heated. In addition, the penetration rod 314 extends outward so that there is a gap between the inside of the stainless steel strip and the outer wall of the loading rod 313, thereby facilitating the entry of heat to heat the stainless steel strip from the inside to the outside at the same time.

[0048] In summary, when using the furnace annealing method for precision stainless steel strips, the stainless steel strips to be annealed are firstly coiled and placed on the surface of the carrier rod 313;

[0049] When the solenoid valve 308 is opened, the first pump body 305 injects oil into the inner cavity 302 outside the furnace body 1. The oil passes through the solenoid valve 308, the hollow telescopic rod 309, and the third pump body 317 in sequence before entering the interior of the loading rod 313, pushing the penetrating rod 314 outward to firmly clamp the stainless steel strip from the inside out. The oil circulates.

[0050] The second pump body 306 injects oil into the inner cavity 302 outside the furnace body 1, causing the piston end 307 and the hollow telescopic rod 309 to retract into the inner cavity 302, thereby closing the furnace door 310 and the furnace body 1. At this time, only the loading rod 313, the penetrating rod 314 and the disc 312 are located inside the furnace body 1;

[0051] The vacuum pump 2 is started to evacuate the furnace body 1 to a vacuum state, and then the temperature inside the furnace body 1 is increased to perform annealing on the stainless steel strip;

[0052] Among them, since two hollow telescopic rods 309 are respectively provided, the inner cavities 302 are connected by an electronic valve, and the top of the connecting pipe 316 is a double-channel design and the bottom is a double-tube design, one hollow telescopic rod 309 is an oil inlet pipe, and the other hollow telescopic rod 309 is an oil outlet pipe. The solenoid valves 308 at the ends of the two hollow telescopic rods 309 are closed, and when the electronic valve between the inner cavities 302 is opened, the first pump body 305 injects oil to make the hollow telescopic rod 309 extend outward, and when the solenoid valve 308 is opened and the inner cavities 302 are closed, the oil is injected into the first pump body 305, and the hollow telescopic rod 309 is extended outward. When the electronic valve is closed, the oil enters the interior of the material carrying rod 313 along any channel at the top of the oil inlet pipe or the connecting pipe 316. As the subsequent oil is injected into the interior of the material carrying rod 313, the oil enters the oil outlet pipe along another channel inside the connecting pipe 316, and finally returns to the inner cavity 302. In the inner cavity 302, a pipe with a valve and a pump body are provided near the end of the oil outlet pipe. The pump body is used to extract the oil discharged from the oil outlet pipe and return it to the oil tank for cooling. The valve is closed when the hollow telescopic rod 309 needs to be extended.

[0053] During the annealing process, the drive motor 502 located outside the furnace door 310 drives the drive gear 501 to rotate the inner gear ring 4 carrying the material carrying rod 313, so that the stainless steel strip rotates and is evenly heated;

[0054] After annealing is completed, the first pump body 305 injects oil into the inner cavity 302. At this time, the solenoid valve 308 is closed, so that the hollow telescopic rod 309 carries the furnace door 310 outward. When the furnace door 310 moves outward, it carries the annealed stainless steel strip out of the furnace body 1. Finally, the solenoid valve 308 is opened and the third pump body 317 discharges the oil in the loading rod 313 into the inner cavity 302, so that the piercing rod 314 releases the clamping of the stainless steel strip.

[0055] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. A furnace annealing method for precision stainless steel strip, characterized by: The furnace annealing method of the precision stainless steel strip comprises the following steps: Step 1: The stainless steel strip to be annealed is coiled and placed on the surface of the carrier rod; Step 2: The solenoid valve is opened, and the first pump body injects oil into the inner cavity outside the furnace body. The oil passes through the solenoid valve, the hollow telescopic rod, and the third pump body in sequence and enters the interior of the loading rod, thereby pushing the penetrating rod outward to firmly clamp the stainless steel strip from the inside to the outside. The oil circulates; Step 3: The first pump body operates in reverse to pump out the oil in the inner cavity, and the second pump body injects the oil into the inner cavity from the outside of the furnace body, causing the piston end carrying the hollow telescopic rod to retract into the inner cavity, thereby closing the furnace door and the furnace body. At this time, only the loading rod, the penetration rod and the disc are inside the furnace body; Step 4: The vacuum pump is started to evacuate the furnace body to a vacuum state, and then the temperature inside the furnace body is increased to anneal the stainless steel strip; Step 5: During the annealing process, the drive motor located outside the furnace door drives the drive gear to rotate the inner gear ring carrying the loading rod, so that the stainless steel strip rotates and is evenly heated; Two hollow telescopic rods are respectively provided, and the inner cavities are connected by an electronic valve, and the top of the connecting pipe is a double-channel design and the bottom is a double-tube design. One hollow telescopic rod is an oil inlet pipe, and the other hollow telescopic rod is an oil outlet pipe. The solenoid valves at the ends of the two hollow telescopic rods are closed, and when the electronic valve between the inner cavities is opened, the first pump body injects oil to make the hollow telescopic rod extend outward, and when the solenoid valve is opened and the electronic valve between the inner cavities is closed, the oil enters the interior of the loading rod along the oil inlet pipe and any channel at the top of the connecting pipe. As the subsequent oil is injected into the interior of the loading rod, the oil enters the oil outlet pipe along another channel inside the connecting pipe, and finally the oil returns to the inner cavity, and a pipe and a pump body with a valve are set in the inner cavity near the end of the oil outlet pipe, and the pump body is used to extract the oil discharged from the oil outlet pipe and return it to the inside of the oil tank for cooling, and the valve is closed when the hollow telescopic rod needs to be extended; Therefore, during the annealing process, the oil is in a flowing state inside the carrier rod; Step 6: After annealing is completed, the first pump body injects oil into the inner cavity. At this time, the solenoid valve is closed, causing the hollow telescopic rod to move the furnace door outward. The furnace door also moves the annealed stainless steel strip out of the furnace body. Finally, the solenoid valve is opened and the third pump body discharges the oil in the loading rod into the inner cavity, causing the threading rod to loosen its grip on the stainless steel strip. and a tube connecting the dischar e side of the pump with a plug in the forward end of the crank case, said tube having a check valve in it at the pump end and a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, said tube having a check valve in it at the pump end and a check valve in it at the pump end. Among them, the bottom of the third pump body is connected to the end of the hollow telescopic rod away from the piston end, and the loading rod is connected to the hollow telescopic rod through a connecting pipe and the third pump body. An inner gear ring is provided at the edge of one side of the disc close to the furnace door, and a strip rotating assembly is provided on the inner side of the inner gear ring. The strip rotating assembly includes a driving gear and a driving motor. The driving gear is meshed with the inner gear ring, and the driving motor is connected to the surface of the driving gear.

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