Annealing operation method for stainless precision strip steel with thickness smaller than or equal to 0.1 mm

Abstract

The invention discloses an annealing operation method for stainless precise strip steel with the thickness smaller than or equal to 0.1 mm. The annealing operation method comprises the steps that a strip steel channel is cleaned, specifically, wide-width double-sided adhesive tape is pasted to the upper surface and the lower surface of a leading tape, and the leading tape passes through all roller faces of a coiling machine; the strip head and the strip tail of the leading strip are in lap joint, multi-point welding is manually conducted in the width direction, welding points are evenly distributed in the lap joint range, redundant parts and chamfers of the lap joint part are cut off after welding is completed, and edge hanging and strip breaking of a welding line are prevented; tension regulation and control: compensating and correcting the coiling tension; regulating and controlling the pressure of a sealing roller: after the material passes through the high-temperature annealing furnace, regulating the pressure of the sealing roller of the annealing furnace; and coiling: shearing and flattening the strip head, wrapping the strip head on a sleeve, aligning the center of the sleeve with the center of the strip steel, performing basic bonding on the strip steel and the sleeve by using an adhesive tape, manually feeding, rotating a coiling machine in a tension-free state, gradually tightening, and starting coiling. According to the method, the surface defects occurring in the production process are effectively overcome, and high-precision plate shape and performance control is achieved.

Description

Technical Field

[0001] This invention belongs to the field of stainless precision strip steel production technology, and particularly relates to an annealing operation method for stainless precision strip steel with a thickness ≤0.1mm. Background Technology

[0002] The main characteristics of stainless steel precision strip are its thinness, defect-free surface, and uniform structure, making the annealing process crucial. Conventional stainless steel annealing uses reciprocating pressure welding with a wheel. However, for thin stainless steel (≤0.1mm), the wheel's rolling action can deform the strip, and excessive current can cause the weld to burn through, leading to weld cracking. In vertical continuous bright furnace annealing, the strip surface remains clean due to degreasing and cleaning before entering the furnace. However, after high-temperature heating in the annealing furnace, some oxide particles adhere to the surface. These particles are carried to the rollers during subsequent roller conveyors, causing bulges on the rollers over time, affecting strip quality. Furthermore, the strip passes through multiple guide rollers from the furnace exit to the coiler, making thorough cleaning difficult due to space constraints. Additionally, defects such as dents, scratches, creases, and pull marks are difficult to overcome using conventional methods during production. Summary of the Invention

[0003] To at least partially solve the technical problems existing in the prior art, the present invention provides an annealing operation method for stainless precision strip steel with a thickness ≤0.1mm.

[0004] The annealing method for stainless precision strip steel with a thickness ≤0.1mm according to the present invention includes: Strip channel cleaning: Before production, prepare the lead strip for operation by attaching wide double-sided tape to the upper and lower surfaces of the lead strip and passing it evenly through each roller surface of the coiler at the set speed to remove impurities adhering to the roller surface. Welding strip: The stainless steel strip to be produced is cut off from the outer folded part by the cutter head, the strip head is overlapped with the strip tail of the lead strip, and fixed with a pressure plate. Multiple welding points are manually performed along the width direction, and each welding point is evenly distributed within the overlap area. After welding, the excess part of the overlap area is cut off and the corner is chamfered to prevent the weld from snagging and breaking the strip. Tension control: Compensate and correct the winding tension; Sealing roller pressure control: After the material passes through the high-temperature annealing furnace, adjust the pressure of the sealing roller of the annealing furnace. Winding: Cut the strip end flat, wrap the strip end around the sleeve, align the center of the sleeve with the center of the strip, and adhere the strip to the surface of the sleeve. Use tape for basic bonding, manually feed the material, rotate the winder under no tension to gradually tighten, and start winding.

[0005] Furthermore, in the above-mentioned annealing operation method for stainless precision strip steel with a thickness ≤0.1mm, in the strip steel channel cleaning step, the lead-in running speed is set to 5-10m / min, and the coiling tension of the coiler is set to 15-20N / mm. 2 .

[0006] Furthermore, in the above-mentioned annealing operation method for stainless precision strip steel with a thickness ≤0.1mm, in the strip welding step, the overlap length between the strip head and the lead strip is controlled at 100-300mm. When welding, a small welding wheel with a diameter of 30mm is used, the welding current is set at 2.7-3.5KA, and the welding length of each welding point is controlled at 40-100mm.

[0007] Furthermore, in the annealing operation method for stainless precision strip steel with a thickness ≤0.1mm, in the tension control step, the compensation and correction method is that the thickness input of the control program must be increased to approximately 1.5 times the actual thickness, and the winding tension is set to M. 输 =35 / (H) 输 / H 实 ±3N / mm 2 Where M is the unit tension, H is the thickness, and ±3 is the correction range; When H 输 / H 实 When the value is greater than 1.5, a positive correction is applied; when the value is less than 1.5, a negative correction is applied.

[0008] Furthermore, in the above-mentioned annealing operation method for stainless precision strip steel with a thickness ≤0.1mm, in the sealing roller pressure adjustment step, the pressure of sealing roller No. 1 is adjusted to 10-20psi, and the pressure of sealing roller No. 2 is adjusted to 7-15psi.

[0009] Furthermore, in the above-mentioned annealing operation method for stainless precision strip steel with a thickness of ≤0.1mm, in the winding step, the sleeve has a wall thickness of 70-100mm, and 3M tape with a length of 10-20mm is used for basic bonding when the strip steel and the sleeve are bonded together.

[0010] Furthermore, in the above-mentioned annealing operation method for stainless precision strip steel with a thickness ≤0.1mm, during the winding step, the winding machine needs to be rotated 3-5 times under no-tension conditions.

[0011] The annealing method for stainless precision strip steel with a thickness ≤0.1mm of the present invention has the following advantages and beneficial effects: This invention cleans the strip channel to prevent oxide particles from adhering to the roller surface and causing bulges that affect the quality of the strip. By adjusting the tension and sealing roller pressure, it effectively avoids pitting, scratches, creases and bleeds on precision strips. It effectively solves the surface defects that occur during the production process and achieves high-precision strip shape and performance control. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0013] The annealing method for stainless precision strip steel with a thickness ≤0.1mm according to the present invention includes: Strip channel cleaning: Before production, prepare the lead strip for operation by attaching wide double-sided tape to the upper and lower surfaces of the lead strip and passing it evenly through each roller surface of the coiler at the set speed to remove impurities adhering to the roller surface. Welding strip: The stainless steel strip to be produced is cut off from the outer folded part by the cutter head, the strip head is overlapped with the strip tail of the lead strip, and fixed with a pressure plate. Multiple welding points are manually performed along the width direction, and each welding point is evenly distributed within the overlap area. After welding, the excess part of the overlap area is cut off and the corner is chamfered to prevent the weld from snagging and breaking the strip. Tension control: Compensate and correct the winding tension; Sealing roller pressure control: After the material passes through the high-temperature annealing furnace, the pressure of the sealing roller of the annealing furnace is adjusted. Because the material softens rapidly when it passes through the high-temperature annealing furnace, its strength decreases, stress is released, and the plate shape changes. This can easily lead to crescent-shaped creases, stripping, and other issues. Therefore, by adjusting the pressure of the furnace sealing roller, the occurrence of crescent-shaped creases, stripping, and other issues can be effectively reduced. Winding: Cut the strip end flat, wrap the strip end around the sleeve, align the center of the sleeve with the center of the strip, and adhere the strip to the surface of the sleeve. Use tape for basic bonding, manually feed the material, rotate the winder under no tension to gradually tighten, and start winding.

[0014] Furthermore, in the annealing operation method for stainless precision strip steel with a thickness ≤0.1mm according to the present invention, in the strip steel channel cleaning step, the lead-in running speed is set to 5-10m / min, and the winding tension of the coiler is set to 15-20N / mm. 2 .

[0015] Furthermore, in the annealing operation method of stainless precision strip steel with a thickness ≤0.1mm of the present invention, in the strip welding step, the overlap length between the strip head and the lead strip is controlled at 100-300mm, a small welding wheel with a diameter of 30mm is used for welding, the welding current is set at 2.7-3.5KA, and the welding length of each welding point is controlled at 40-100mm.

[0016] Furthermore, in the annealing operation method for stainless precision strip steel with a thickness ≤0.1mm according to the present invention, in the tension control step, the compensation and correction method is that the thickness input of the control program must be increased to about 1.5 times the actual thickness, and the winding tension is set to M. 输 =35 / (H) 输 / H 实 ±3N / mm 2 Where M is the unit tension, H is the thickness, and ±3 is the correction range; When H 输 / H 实 When the value is greater than 1.5, a positive correction is applied; when the value is less than 1.5, a negative correction is applied.

[0017] Furthermore, in the annealing operation method for stainless precision strip steel with a thickness ≤0.1mm of the present invention, in the sealing roller pressure adjustment step, the pressure of sealing roller No. 1 is adjusted to 10-20psi and the pressure of sealing roller No. 2 is adjusted to 7-15psi.

[0018] Furthermore, in the annealing operation method of stainless precision strip steel with a thickness ≤0.1mm in this invention, in the winding step, the sleeve has a wall thickness of 70-100mm, and 3M tape with a length of 10-20mm is used for basic bonding when the strip steel and the sleeve are bonded together.

[0019] Furthermore, in the annealing operation method for stainless precision strip steel with a thickness ≤0.1mm of the present invention, in the winding step, the winding machine needs to be rotated 3-5 times under no tension.

[0020] Example 1 SUS316L stainless steel strip with a thickness of 0.08mm was selected for annealing.

[0021] Strip steel channel cleaning: Before starting production, prepare for the strip train operation. Apply wide double-sided adhesive tape (model 3M 300LSE) to the upper and lower surfaces of the strip train at the furnace outlet. Set the strip train speed to 8m / min and the winding tension to 158N / mm. 2 This allows the tape to pass evenly through each roller surface, removing impurities adhering to the roller surface; Welding strip: The stainless steel strip to be produced is cut off from the outer folded part by a cutter head. The strip head is overlapped with the strip tail of the lead strip, with an overlap length of 280mm. When overlapping the front and rear rolls, keep the center aligned and fix it with a pressure plate. Use a small welding wheel with a diameter of 30mm for welding. Set the welding current to 3KA and weld manually. When welding, perform multi-point welding along the width direction. The welding length of each welding point is 40-100mm. The welding points are evenly distributed within the overlap area. After welding, use tin snips to cut off the excess part of the overlap area and chamfer to prevent the weld from snagging and breaking the strip. Tension control: Control program thickness input 0.125mm, H 输 / H 实 =0.125 / 0.08=1.5625, according to the winding tension setting formula M 输 =35 / (H) 输 / H 实 ±3N / mm 2 When H 输 / H 实 When the value is greater than 1.5, a positive correction is applied, with a correction value of 1. Therefore, the final tension input value is 35 / 1.5625+1=23.4N / mm. 2 ; Sealing roller pressure control: Adjust the pressure of the furnace sealing rollers, setting the pressure of sealing roller No. 1 to 15 psi and sealing roller No. 2 to 8 psi, which can effectively reduce the occurrence of tooth-like creases, tape pulling, and other issues.

[0022] Winding: Cut the strip head flat, select a steel sleeve with a wall thickness of 100mm, manually wrap the strip head around the sleeve, align the center of the sleeve with the center of the strip, and adhere the strip to the surface of the sleeve. Use 15mm long 3M tape for basic bonding, then manually feed the material, rotate the winding machine 3 times in a tension-free state, and then gradually tighten it to start winding.

[0023] The SUS316L-0.08mm stainless steel material produced using this method effectively avoids problems such as dents, creases, spotting, and coil collapse during the annealing process.

[0024] In summary, compared with the prior art, the annealing operation method for stainless precision strip steel with a thickness ≤0.1mm of the present invention has the following advantages and beneficial effects: The present invention avoids the formation of protrusions on the roller surface due to the adhesion of oxide particles during long-term production by cleaning the strip steel channel, which affects the quality of the steel strip. Through tension regulation and sealing roller pressure regulation, it effectively avoids the occurrence of pitting, scratches, creases and bleeds in the precision strip steel, effectively solves the surface defects that occur during the production process, and achieves high-precision plate shape and performance control.

[0025] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An annealing method for stainless precision strip steel with a thickness ≤0.1mm, characterized in that, The annealing process for the stainless precision strip with a thickness ≤0.1mm includes: Strip channel cleaning: Before production, prepare the lead strip for operation by attaching wide double-sided tape to the upper and lower surfaces of the lead strip and passing it evenly through each roller surface of the coiler at the set speed to remove impurities adhering to the roller surface. Welding strip: The stainless steel strip to be produced is cut off from the outer folded part by the cutter head, the strip head is overlapped with the strip tail of the lead strip, and fixed with a pressure plate. Multiple welding points are manually performed along the width direction, and each welding point is evenly distributed within the overlap area. After welding, the excess part of the overlap area is cut off and the corner is chamfered to prevent the weld from snagging and breaking the strip. Tension control: Compensate and correct the winding tension; Sealing roller pressure control: After the material passes through the high-temperature annealing furnace, adjust the pressure of the sealing roller of the annealing furnace. Winding: Cut the strip end flat, wrap the strip end around the sleeve, align the center of the sleeve with the center of the strip, and adhere the strip to the surface of the sleeve. Use tape for basic bonding, manually feed the material, rotate the winder under no tension to gradually tighten, and start winding.

2. The annealing method for stainless precision strip steel with a thickness ≤0.1mm according to claim 1, characterized in that, During the strip channel cleaning process, the guide belt running speed is set to 5-10 m / min, and the coiling tension of the coiler is set to 15-20 N / mm. 2 .

3. The annealing method for stainless precision strip steel with a thickness ≤0.1mm according to claim 1, characterized in that, In the strip welding process, the overlap length between the strip head and the lead strip is controlled at 100-300mm. A small welding wheel with a diameter of 30mm is used for welding, and the welding current is set at 2.7-3.5KA. The welding length of each welding point is controlled at 40-100mm.

4. The annealing method for stainless precision strip steel with a thickness ≤0.1mm according to claim 1, characterized in that, In the tension control step, the compensation correction method is to increase the control program thickness input to approximately 1.5 times the actual thickness, and set the winding tension M. 输 =35 / (H) 输 / H 实 ±3N / mm 2 Where M is the unit tension, H is the thickness, and ±3 is the correction range; When H 输 / H 实 When the value is greater than 1.5, a positive correction is applied; when the value is less than 1.5, a negative correction is applied.

5. The annealing method for stainless precision strip steel with a thickness ≤0.1mm according to claim 1, characterized in that, In the sealing roller pressure adjustment step, adjust the pressure of sealing roller No. 1 to 10-20 psi and the pressure of sealing roller No. 2 to 7-15 psi.

6. The annealing method for stainless precision strip steel with a thickness ≤0.1mm according to claim 1, characterized in that, During the winding process, the sleeve has a wall thickness of 70-100mm, and 3M tape with a length of 10-20mm is used for basic bonding when the strip steel is bonded to the sleeve.

7. The annealing method for stainless precision strip steel with a thickness ≤0.1mm according to claim 1, characterized in that, During the winding process, the winding machine needs to be rotated 3-5 times under no-tension conditions.