Continuous annealing process of cold-rolled titanium strip coil for deep drawing

Abstract

The continuous annealing process for the cold-rolled titanium strip coil for deep drawing comprises the following steps that S1, in the preparation stage, the titanium strip coil is subjected to degreasing and cleaning treatment; s2, the continuous annealing furnace is heated to the required temperature, high-purity argon is introduced into the furnace, and the positive pressure in the furnace is kept; s3, the pretreated titanium belt is pulled by a leading belt to enter a continuous annealing furnace and passes through a preheating section, a heating section and a cooling section at a specified speed; according to the continuous annealing method, through continuous annealing, the grain size and the mechanical property of the titanium belt are accurately controlled, and the performance requirement of the titanium belt for stamping machining is met.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium strip coil production, and in particular relates to a continuous annealing process for a cold-rolled titanium strip coil for deep drawing. Background Art

[0002] In the continuous annealing process of the metal processing industry, titanium strip is a key material, and its surface quality is directly related to the final performance and market acceptance of the product.

[0003] However, nodules will inevitably form on the surface of the furnace rollers. These nodules, formed by the long-term accumulation of oxides, carbides or other impurities, are hard and protruding, becoming a hidden "trap" in the annealing process. When the soft titanium strip shuttles between the furnace rollers at a steady speed for the critical heat treatment, its surface may collide or rub against these sharp nodules, thus suffering from scratches. Under the catalysis of high temperature, this slight damage quickly expands, and eventually leaves a series of shocking pitting on the surface of the titanium strip.

[0004] The generation of pits makes it very easy to cause the initiation and expansion of cracks during the deep drawing process, which eventually leads to the failure of the titanium strip. This not only reduces the qualified rate of the product, but also increases the waste and cost in the production process. Summary of the invention

[0005] The purpose of the present invention is to propose a continuous annealing process for cold-rolled titanium strip coils for deep drawing in order to solve the problem that the generation of pits easily causes the initiation and expansion of cracks during the deep drawing process, which eventually leads to the failure of the titanium strip, which not only reduces the qualified rate of the product but also increases the waste and cost in the production process.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme: a continuous annealing process of a cold-rolled titanium strip coil for deep drawing, comprising the following steps:

[0007] S1: In the preparation stage, the titanium strip coil is degreased and cleaned;

[0008] S2: The continuous annealing furnace is heated to the required temperature, high-purity argon is passed into the furnace and the positive pressure in the furnace is maintained;

[0009] S3: The pretreated titanium strip is drawn into the continuous annealing furnace by a lead belt and passes through the preheating section, heating section, and cooling section at a specified speed;

[0010] S4: Discharging and post-processing: unloading the annealed and cooled titanium strip coil from the production line, performing surface treatment on it and winding it.

[0011] As a further description of the above technical solution:

[0012] In S2, the annealing temperature is between 720°C and 810°C, and the titanium coil is heated to a predetermined annealing temperature and maintained for a period of time to homogenize the internal structure of the titanium coil and further eliminate internal stress.

[0013] As a further description of the above technical solution:

[0014] The annealing furnace is provided with a tension control device so that the titanium strip coil is suspended in the furnace to reduce direct contact with the furnace wall.

[0015] As a further description of the above technical solution:

[0016] The annealing furnace is provided with a deviation correcting device for guiding the titanium strip coil to move in the furnace so that the titanium strip coil can move stably in a suspended state.

[0017] As a further description of the above technical solution:

[0018] The annealing furnace also includes a safety system including an emergency stop device.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] 1. In the present invention, the grain size and mechanical properties of the titanium strip are accurately controlled through continuous annealing to meet the performance requirements of the titanium strip for stamping processing.

[0021] 2. In the present invention, a tension control device is provided in the annealing furnace so that the titanium strip coil is suspended in the furnace, thereby reducing contact with the furnace wall and reducing the occurrence of adhesion and pitting defects. At the same time, the first guide rail parallel to the furnace wall is used to ensure that the titanium strip coil moves stably under the correction of the correction device. Through continuous annealing, the grain size and mechanical properties of the titanium strip are accurately controlled to meet the performance requirements of the titanium strip for stamping processing.

[0022] 3. In the present invention, an ultrasonic vibration device is activated, and the ultrasonic vibration energy is transmitted to the surface and interior of the titanium strip coil through an ultrasonic generator and a vibration transmission device, so as to promote the reorganization of the microstructure, reduce internal defects, and improve the deep drawability of the material. The ultrasonic vibration frequency and intensity are adjusted according to the material and annealing requirements of the titanium strip coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1A process flow chart of continuous annealing of a cold-rolled titanium strip coil for deep drawing. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "inner", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiment 1

[0032] See also Figure 1 The present invention provides a technical solution: a continuous annealing process for a cold-rolled titanium strip coil for deep drawing, comprising the following steps:

[0033] S1: In the preparation stage, the titanium strip coil is degreased and cleaned;

[0034] S2: The continuous annealing furnace is heated to the required temperature, high-purity argon is passed into the furnace and the positive pressure in the furnace is maintained;

[0035] S3: The pre-treated titanium strip is drawn into the continuous annealing furnace by the guide belt and passes through the pre-annealing furnace at a specified speed.

[0036] Hot section, heating section, cooling section;

[0037] S4: Discharging and post-processing: unloading the annealed and cooled titanium strip coil from the production line, performing surface treatment on it and winding it.

[0038] The annealing temperature in S2 is between 720°C and 810°C. An ultrasonic vibration device is provided in the annealing furnace. With the assistance of ultrasonic vibration, the titanium coil is continuously heated to a predetermined annealing temperature and maintained for a period of time to homogenize the internal structure of the titanium coil and further eliminate internal stress.

[0039] After annealing, the titanium strip is cooled quickly and evenly by a cooling device to fix the annealed structure and prevent the material properties from decreasing due to too slow cooling. The cooling method is water quenching, air cooling or a combination of the two.

[0040] The ultrasonic vibration device includes an ultrasonic generator and a vibration transmission device. The ultrasonic generator is installed on both sides of the annealing furnace. The ultrasonic vibration energy is transmitted to the surface and interior of the titanium strip coil through the vibration transmission device, thereby promoting the reorganization of the microstructure of the titanium strip coil and reducing internal defects.

[0041] The ultrasonic vibration device is provided with a control unit, which adjusts the vibration frequency and intensity of the ultrasonic wave according to the material and annealing requirements of the titanium strip coil.

[0042] Embodiment 2

[0043] The annealing furnace is provided with a tension control device, so that the titanium strip coil is suspended in the furnace, reducing direct contact with the furnace wall. The annealing furnace is provided with a deviation correction device, which is used to guide the titanium strip coil to move in the furnace, so that the titanium strip coil moves stably in a suspended state. By setting a tension control device in the annealing furnace, the titanium strip coil is suspended in the furnace, reducing contact with the furnace wall, reducing the occurrence of adhesion and pitting defects, and at the same time, in conjunction with the first guide rail parallel to the furnace wall, ensuring that the titanium strip coil moves stably under the deviation correction of the deviation correction device, through continuous annealing, accurately controlling the grain size and mechanical properties of the titanium strip, and meeting the performance requirements of titanium strip for stamping processing.

[0044] Working principle: a titanium strip coil is placed in a furnace, a tension control device is started to suspend the titanium strip coil, and then the titanium strip coil is moved along the first guide rail during the annealing process until the annealing process is completed. By reducing the friction between the titanium strip coil and the furnace wall, the system effectively reduces the occurrence of bonding and pitting defects during the annealing process, improves the surface quality and annealing effect of the titanium strip coil, and an ultrasonic vibration device is arranged in the annealing furnace. The device includes an ultrasonic generator and a vibration transmission device. The ultrasonic generator is installed on both sides of the annealing furnace. The ultrasonic vibration energy is transmitted to the surface and inside of the titanium strip coil through the vibration transmission device, which promotes the reorganization of the microstructure of the titanium strip coil, reduces internal defects, and improves the deep drawability of the material; the control unit adjusts the vibration frequency and intensity of the ultrasonic wave according to the material and annealing requirements of the titanium strip coil. During the entire annealing process, the weight, temperature, speed and other parameters of the titanium strip coil are monitored in real time through the control system (including the first controller) to ensure stable suspension and efficient annealing of the titanium strip coil; at the same time, it also includes an online quality detection step for real-time monitoring of the performance changes of the titanium strip coil during the annealing process, timely adjusting the process parameters, and ensuring the annealing quality.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A continuous annealing process for cold-rolled titanium strip coil for deep drawing, characterized in that: The following steps are involved: S1: In the preparation stage, the titanium strip coil is degreased and cleaned; S2: The continuous annealing furnace is heated to the required temperature, high-purity argon is passed into the furnace and the positive pressure is maintained; S3: The pretreated titanium strip is drawn into the continuous annealing furnace by a guide belt and passes through the preheating section, heating section and cooling section at a specified speed; S4: Discharging and post-processing: unloading the annealed and cooled titanium strip coil from the production line, performing surface treatment on it and winding it.

2. A continuous annealing process for cold-rolled titanium strip coil for deep drawing according to claim 1, characterized in that: In S2, the annealing temperature is between 720°C and 810°C, and the titanium coil is continuously heated to a predetermined annealing temperature and maintained for a period of time to homogenize the internal structure of the titanium coil and further eliminate internal stress.

3. A continuous annealing process for cold-rolled titanium strip coil for deep drawing according to claim 1, characterized in that: The annealing furnace is provided with a tension control device so that the titanium strip coil is suspended in the furnace to reduce direct contact with the furnace wall.

4. A continuous annealing process for cold-rolled titanium strip coil for deep drawing according to claim 1, characterized in that: The annealing furnace is provided with a deviation correcting device for guiding the titanium strip coil to move in the furnace so that the titanium strip coil can move stably in a suspended state.

5. A continuous annealing process for cold-rolled titanium strip coil for deep drawing according to claim 3, characterized in that: The annealing furnace also includes a safety system including an emergency stop device.

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