A metal strip tension heat treatment process

Abstract

The application discloses a metal strip tension heat treatment process, comprising the following steps: S1. placing a coiled metal strip on an unwinding machine, welding a leading strip on the head of the metal strip, threading the leading strip through a first front pressing device, through a first heat treatment furnace body, through a first rear pressing device, then threading the leading strip through a second front pressing device, through a second heat treatment furnace body, through a first rear pressing device, and winding the leading strip to a winding machine; S2. starting heating of the first heat treatment furnace body, while the first front and rear pressing devices apply a tensioning force, and a gas protection is adopted in the heating process; S3. starting heating of the second heat treatment furnace body, and increasing the temperature in the furnace body; while the second front and rear pressing devices apply a tensioning force, and a gas protection is adopted in the heating process; S4. starting the winding machine, threading the metal strip through the furnace body filled with a protective gas, winding the metal strip to the winding machine, and radiantly heating and then cooling the metal strip in the furnace body filled with the protective gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat treatment process, in particular to a metal strip tension heat treatment process. BACKGROUND

[0002] In the non-ferrous metal plate and strip production process, annealing heat treatment is an important part of the whole production process, using heat treatment can not only control the final performance of the product, but also must be heat treated to the processed material to eliminate work hardening and restore the plasticity of the deformed metal, so as to ensure that the processed material has certain processing process performance, the main parameters of the annealing process are: heating speed; The highest heating temperature; The holding time at the highest temperature; Cooling speed. The heat treatment temperature and holding time should be strictly controlled, especially before the heat treatment of the finished product, to prevent the metal strip from overheating and producing surface "orange peel" phenomenon, affecting the surface quality or the final performance of the product, but in the heat treatment process, the heat treatment residual force is the stress finally left in the workpiece after heat treatment, which has a very important influence on the shape, size and performance of the workpiece, when it exceeds the yield strength of the material, it will cause the deformation of the workpiece, and when it exceeds the strength limit of the material, it will cause the cracking of the workpiece, which is the harmful side and should be reduced and eliminated. SUMMARY

[0003] The purpose of the present application is to solve the above technical problems, and provide a metal strip tension heat treatment process, which is attached to the material by the front and rear tension devices (precise control), so that the inconsistent material organization length becomes consistent, thereby eliminating the internal stress of the material, and the consistency of the material organization after annealing is greatly improved, and the deformation amount of the material in the subsequent processing process is small, and the residual stress is low.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme: a metal strip tension heat treatment process, comprising the following steps:

[0005] S1. Place the coiled metal strip on the unwinding machine, weld the metal strip head with the lead, pass the lead through the first front pressing device, through the first heat treatment furnace body, through the first rear pressing device, then pass the lead through the second front pressing device, through the second heat treatment furnace body, through the second rear pressing device, and wind to the winding machine;

[0006] S2. The first heat treatment furnace body starts heating, while the first front pressing device and the first rear pressing device apply tensioning force, and the heating process adopts gas protection;

[0007] S3. The second heat treatment furnace body starts heating, and the temperature in the furnace body is increased; At the same time, the second front pressing device and the second rear pressing device apply tensioning force, and the heating process adopts gas protection;

[0008] S4. Start the winding machine, and pass the metal strip from the furnace filled with protective gas to the winding machine, and the metal strip is first radiantly heated in the furnace filled with protective gas and then cooled.

[0009] In order to realize online heating and make the metal strip reach the heat treatment temperature and be able to sustain heat preservation, the further preferred technical solution is that, in the steps S2 and S3, a tubular furnace is used for heat treatment, and the length of the tubular furnace is 8 meters.

[0010] In order to realize the tensioning processing technology of stainless steel wire rod and remove heat treatment stress, the further preferred technical solution is that, in the step S1, the metal strip is a stainless steel wire rod, and the feeding speed is 3-5 m / min.

[0011] In the step S2, the first heat treatment furnace starts heating, and the heating temperature is 550-600 DEG C, while the first front pressing device and the first rear pressing device apply a tensioning force of 300-500 N, the heating process is protected by argon, and the furnace time is 6-8 min.

[0012] In the step S3, the second heat treatment furnace starts heating, and the temperature in the furnace is increased to 850±10 DEG C; while the second front pressing device and the second rear pressing device apply a tensioning force of 100-300 N, the heating process is protected by argon, and the furnace time is 3-5 min.

[0013] In order to realize the tensioning processing technology of titanium alloy strip and remove heat treatment stress, the further preferred technical solution is that, in the step S1, the metal strip is a titanium alloy strip, and the feeding speed is 4-7 m / min.

[0014] In the step S2, the first heat treatment furnace starts heating, and the heating temperature is 600-650 DEG C, while the first front pressing device and the first rear pressing device apply a tensioning force of 400-600 N, the heating process is protected by argon, and the furnace time is 5-10 min.

[0015] In the step S3, the second heat treatment furnace starts heating, and the temperature in the furnace is increased to 880-940 DEG C; while the second front pressing device and the second rear pressing device apply a tensioning force of 200-400 N, the heating process is protected by argon, and the furnace time is 4-7 min.

[0016] In order to realize accurate control by the front and rear tensioning devices attached to the material, so that the inconsistent material organization length becomes consistent, the further preferred technical solution is that, in the step S2, the tensioning force applied by the first front pressing device and the first rear pressing device is decreased with the increase of the temperature of the first heat treatment furnace, and then the tensioning force is stably applied until the end of the furnace time.

[0017] In order to control the material by the front and rear tension device, the inconsistent material organization length becomes consistent, and the further preferred technical scheme is that in the S3 step, the second front pressing device and the second rear pressing device reduce the tension force with the increase of the temperature of the second heat treatment furnace body, and then the tension force is stably applied until the end of the furnace time.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] The problem of twisted wire in the rolling process is solved, the twisted wire problem is that the material is deformed unevenly in the rolling or drawing process, the material shows the characteristics of twisting, the strength of the material is reduced in the heating furnace, the front and rear tension devices are attached to the material (precise control), the inconsistent material organization length becomes consistent, thereby eliminating the internal stress of the material, the consistency of the material organization after annealing is greatly improved, the deformation amount of the material in the subsequent processing process is small, and the residual stress is low. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The flowchart of the present application;

[0021] In the figure: 1. unwinding machine; 2. first guide roller; 3. first support roller; 4. first front pressing device; 5. first flattening roller; 6. first heat treatment furnace body; 7. first rear pressing device; 8. second support roller; 9. second guide roller; 10. second front pressing device; 11. second flattening roller; 12. second heat treatment furnace body; 13. second rear pressing device; 14. third support roller; 15. third guide roller; 16. winding machine. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all.

[0023] Embodiment one

[0024] The stainless steel wire rod tension heat treatment process comprises the following steps:

[0025] S1: The coil of stainless steel wire rod is placed on the unwinding machine 1, and the wire rod is unwound. The wire rod is welded with a lead, and the lead is threaded through the first guide roller 2, which is composed of a pair of rollers, for guidance, and then through the first support roller 3, which is a single roller and is mainly used for support. Then the wire rod is threaded through the first front tension device 4, which is composed of a pair of upper and lower matched rollers. The distance between the upper and lower matched rollers is automatically controlled by a hydraulic device, and the tensioning force can be dynamically adjusted. Then the lead is threaded through the first heat treatment furnace body 6, which is a tubular furnace for heat treatment, and the length of the tubular furnace is 8 meters. First flattening rollers 5 are arranged at the front and rear ends of the first heat treatment furnace body 6 for measuring the incoming line speed. Then the lead is threaded through the first rear tension device 7, which has the same structure as the first front tension device 4. After passing through a pair of second support rollers 8, the lead is threaded through the second front tension device 10. A second guide roller 9 can be arranged between the pair of second support rollers 8 for guidance. Then the lead is threaded through the second heat treatment furnace body 12, which is a tubular furnace for heat treatment, and the length of the tubular furnace is 8 meters. Second flattening rollers 11 are arranged at the front and rear ends of the second heat treatment furnace body 12 for measuring the incoming line speed. Then the lead is threaded through the second rear tension device 13, and then through the third support roller 14 and the third guide roller 15 and wound onto the winding machine 16. The incoming line speed is 3 m / min.

[0026] S2. The first heat treatment furnace body 6 starts heating to 580℃, while the first front tension device 4 and the first rear tension device 7 apply a tensioning force of 500N. The tensioning force is adjusted by the speed difference between the first rear tension device 7 and the first front tension device 4 and the pressure of the roller pair on the metal strip. As the temperature rises, the tensioning force gradually decreases to 350N, and then the tensioning force is maintained at 350N. The heating process is protected by argon, and the furnace time is 7 minutes.

[0027] S3. After the stainless steel wire rod passes through the first heat treatment furnace body 6, it is cooled and enters the second heat treatment furnace body 12 to start heating, increasing the temperature in the furnace body to 850℃. At the same time, the second front tension device 10 and the second rear tension device 13 apply a tensioning force of 300N. The tensioning force is adjusted by the speed difference between the second rear tension device 13 and the second front tension device 10 and the pressure of the roller pair on the metal strip. As the temperature rises, the tensioning force gradually decreases to 100N, and then the tensioning force is maintained at 100N. The furnace time is 3 minutes.

[0028] S4. Start the winding machine 16, and the stainless steel wire rod passes through the furnace body filled with protective gas and is wound onto the winding machine. The stainless steel wire rod is first radiantly heated in the protective gas furnace body and then cooled.

[0029] Solve the twist problem in the rolling process, the twist problem is that the material is unevenly deformed in the rolling or drawing process, the material performance characteristics are twisted, in the heating furnace, the strength of the material is reduced, the front and rear tension devices are attached to the material (precise control), the material organization length inconsistency is made consistent, so as to eliminate the internal stress of the material, the consistency of the material organization is greatly improved after annealing, the deformation of the material is small in the subsequent processing process, the residual stress is low, the processing stress can be removed on line, the working time is saved, and the working efficiency is improved.

[0030] Example two

[0031] Titanium alloy strip tension heat treatment process, comprising the following steps:

[0032] S1. The coil titanium alloy strip is placed on the unwinding machine 1, the titanium alloy strip head is welded with a lead, the lead is passed through the first front pressing device 4, the first heat treatment furnace body 6, the first rear pressing device 7, then the lead is passed through the second front pressing device 10, the second heat treatment furnace body 12, the second rear pressing device 13, and wound to the winding machine 16;

[0033] S2. The first heat treatment furnace body 6 starts heating, heating to 650 DEG C, while the first front pressing device 4 and the first rear pressing device 7 apply 550 N tension, the heating process adopts argon protection, and the furnace time is 8 min;

[0034] S3. After the titanium alloy strip passes through the first heat treatment furnace body 6, it enters the second heat treatment furnace body 12 to start heating, and the temperature in the furnace body is increased to 940 DEG C; while the second front pressing device 10 and the second rear pressing device 13 apply 350 N tension, the heating process adopts argon protection, and the furnace time is 7 min.

[0035] S4. Start the winding machine 16, pass the titanium alloy strip from the furnace body filled with protective gas, and wind to the winding machine, the titanium alloy strip is first radiated in the protective gas furnace body, and then cooled.

[0036] The above only describes the preferred embodiments of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A metal strip tension heat treatment process characterized by, It comprises the following steps: S1. Place the coiled metal strip on the unwinding machine, weld the head of the metal strip with a lead, pass the lead through the first front pressing device, through the first heat treatment furnace, through the first rear pressing device, then pass the lead through the second front pressing device, through the second heat treatment furnace, through the second rear pressing device, and around to the winding machine; S2. The first heat treatment furnace starts heating, while the first front pressing device and the first rear pressing device apply tensioning force, and the heating process adopts gas protection; S3. The second heat treatment furnace starts heating, and the temperature in the furnace is increased; at the same time, the second front pressing device and the second rear pressing device apply tensioning force, and the heating process adopts gas protection; S4. Start the winding machine, pass the metal strip through the furnace filled with protective gas, and wind it to the winding machine. The metal strip is first radiantly heated in the protective gas furnace and then cooled.

2. A metal strip tension heat treatment process according to claim 1, characterized in that: In steps S2 and S3, a tubular furnace is used for heat treatment: the length of the tubular furnace is 8 meters.

3. A metal strip tension heat treatment process according to claim 2, wherein, In step S1, the metal strip is a stainless steel rod, and the incoming line speed is 3-5 m / min; In step S2, the first heat treatment furnace starts heating to 550-600℃, while the first front pressing device and the first rear pressing device apply a tensioning force of 300-500 N, and the heating process adopts argon protection, with a furnace time of 6-8 min; In step S3, the second heat treatment furnace starts heating, and the temperature in the furnace is increased to 840-860℃; at the same time, the second front pressing device and the second rear pressing device apply a tensioning force of 100-300 N, and the heating process adopts argon protection, with a furnace time of 3-5 min.

4. A metal strip tension heat treatment process according to claim 2, wherein, In step S1, the metal strip is a titanium alloy strip, and the incoming line speed is 4-7 m / min; In step S2, the first heat treatment furnace starts heating to 600-650℃, while the first front pressing device and the first rear pressing device apply a tensioning force of 400-600 N, and the heating process adopts argon protection, with a furnace time of 5-10 min; In step S3, the second heat treatment furnace starts heating, and the temperature in the furnace is increased to 880-940℃; at the same time, the second front pressing device and the second rear pressing device apply a tensioning force of 200-400 N, and the heating process adopts argon protection, with a furnace time of 4-7 min.

5. A metal strip tension heat treatment process according to claim 3 or 4, c h a r a c t e r i s e d in that In step S2, the tensioning force applied by the first front pressing device and the first rear pressing device decreases as the temperature of the first heat treatment furnace increases, and then a stable tensioning force is applied until the end of the furnace time.

6. A metal strip tension heat treatment process according to claim 3 or 4, wherein, In step S3, the tensioning force applied by the second front pressing device and the second rear pressing device decreases as the temperature of the second heat treatment furnace increases, and then a stable tensioning force is applied until the end of the furnace time.

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