Normalizing pickling unit and normalizing pickling online trimming method

Abstract

The invention relates to the technical field of normalizing pickling, in particular to a normalizing pickling unit and a normalizing pickling online trimming method. The invention provides a normalizing pickling unit which comprises a heating shearing part, a normalizing furnace, a pickling part, a first conveying mechanism and a second conveying mechanism, the first conveying mechanism is arranged between the heating shearing part and the inlet end of the normalizing furnace, and the second conveying mechanism is arranged between the outlet end of the normalizing furnace and the pickling part. The heating and shearing part comprises a heating device, a crescent shear and a trimming shear, and the crescent shear is arranged between the heating device and the trimming shear. According to the technical scheme, heating is carried out firstly, then trimming operation is carried out, and then normalizing pickling production is carried out, so that a stress concentration point generated during trimming can be eliminated during subsequent normalizing, subsequent production faults caused by trimming stress concentration are reduced, and the stability of cold rolling production is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of normalized pickling, and in particular to a normalized pickling unit and a normalized pickling online trimming method. Background Art

[0002] The normalizing pickling unit is the first process in the cold rolling process of high-grade non-oriented silicon steel production. The non-oriented silicon steel hot coil base is normalized, and pickling is performed to remove the surface oxide scale after normalization. After pickling, the edge is trimmed. It plays an extremely important role in the subsequent process production and product performance. Due to the high silicon content of high-grade non-oriented silicon steel, edge quality problems such as edge cracks will occur on the edge after hot rolling. Such defects make the cold rolling mill process unable to roll, so it is necessary to trim the edge before cold rolling to remove the part with poor edge quality. The traditional normalizing pickling unit is equipped with a trimming shear after the pickling section to trim the hot-rolled base material. The hot-rolled raw materials are produced in the order of normalizing-pickling-trimming. However, due to the edge quality problems such as edge cracks on the hot-rolled base material that needs to be trimmed, there is a greater operating risk after the normalizing pickling unit is put into operation. At the same time, after normalizing and pickling, edge trimming is performed. After edge shearing, there will be stress concentration points and poor edge trimming quality. Edge cracks will occur during cold rolling, resulting in broken strips or the inability to go online for subsequent production processes. Summary of the invention

[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, in a first aspect of the present disclosure, a normalizing pickling unit is provided, comprising a heating shearing section, a normalizing furnace, a pickling section, a first conveying mechanism and a second conveying mechanism, wherein the first conveying mechanism is arranged between the heating shearing section and the inlet end of the normalizing furnace, and the second conveying mechanism is arranged between the outlet end of the normalizing furnace and the pickling section, wherein:

[0005] The heating and shearing part comprises a heating device, a crescent shear and a trimming shear, wherein the crescent shear is arranged between the heating device and the trimming shear.

[0006] In a feasible implementation manner, a dryer is provided at the outlet end of the normalizing furnace.

[0007] In a feasible implementation manner, the pickling section is provided with a shot blasting machine, a pickling mechanism, a rinsing mechanism and a drying mechanism from the beginning to the end, and the drying mechanism is connected to the coiler through a third conveying mechanism.

[0008] In a feasible implementation manner, a cross-cutting shear and a surface inspection instrument are provided at the inlet side of the coiler, and the cross-cutting shear is provided between the coiler and the surface inspection instrument.

[0009] In a second aspect of the present disclosure, a method for trimming edges in normalized pickling is provided, which is applied to the normalized pickling unit described above, and comprises:

[0010] A hot-rolled base material is selected, and the hot-rolled base material is welded by a welding machine;

[0011] Heating the hot-rolled substrate, using a heating device to heat the hot-rolled substrate;

[0012] Hot rolled substrate shearing, the shearing mechanism performs trimming operations according to the set target size;

[0013] Normalizing furnace operation, the hot-rolled substrate sheared by the shearing mechanism enters the normalizing furnace for normalizing operation;

[0014] Pickling operation, the hot-rolled substrate passing through the normalizing furnace enters the pickling section for pickling operation;

[0015] After the production is completed, the steel that has undergone the pickling operation is taken out by a coiler to complete the normalized pickling production.

[0016] In a feasible implementation manner, the heating device is configured as a longitudinal magnetic electromagnetic induction heating device.

[0017] In a feasible embodiment, the heating temperature of the longitudinal magnetic electromagnetic induction heating device is set to 70 degrees to 120 degrees

[0018] In a feasible implementation manner, the heating temperature is set to 100 degrees.

[0019] In a feasible implementation manner, the welder is configured as a laser welder.

[0020] In a feasible implementation, in the step of shearing the hot-rolled substrate, a crescent shear and a trimming shear are included, the weld stays at the edge of the crescent shear to shear the crescent, and then the trimming shear is used to trim the edges.

[0021] Compared with the prior art, the present invention at least includes the following beneficial effects: the present invention first utilizes the heating and shearing part to heat and shear the substrate, and then enters the normalizing furnace through the first conveying mechanism, and after passing through the normalizing furnace to eliminate the stress concentration points generated during edge cutting, enters the pickling part through the second conveying mechanism for pickling operation, and the subsequent production failures caused by edge cutting stress concentration are reduced, which greatly improves the stability of cold rolling production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the exemplary embodiments below. The accompanying drawings are only for the purpose of illustrating exemplary embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the structure of the present disclosure;

[0026] Figure 2 The figure is a schematic diagram of a flow chart of the method disclosed in the present invention.

[0027] in, Figure 1 to Figure 2 The correspondence between the reference numerals and the component names is as follows: 1-heating and shearing section; 11-heating device; 12-crescent shears; 13-edge trimming shears; 2-normalizing furnace; 3-pickling section; 31-shot blasting machine; 32-pickling mechanism; 33-rinsing mechanism; 4-first conveying mechanism; 5-second conveying mechanism; 6-dryer; 7-third conveying mechanism; 8-coiler; 9-cross-cutting shears; 10-surface inspector. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0030] At present, the traditional normalized pickling unit is equipped with a trimming shear after the pickling section to perform trimming on the hot-rolled base material, and the hot-rolled raw materials are produced in the order of normalization-pickling-trimming. However, since the hot-rolled base material that needs trimming has edge quality problems such as edge cracks, there is a greater operating risk after the normalized pickling unit is put into operation. At the same time, trimming is performed after the normalized pickling is completed. After the edge is sheared, there will be stress concentration points and poor trimming quality problems. Edge cracks will occur during cold rolling, resulting in broken strips or the inability to go online for subsequent production processes.

[0031] Since the high-grade non-oriented silicon steel hot-rolled base material that needs trimming has edge quality problems such as edge cracks, the traditional normalized pickling unit is equipped with a trimming shear after the pickling section to trim the hot-rolled base material, and the hot-rolled raw materials are produced in the order of normalization-pickling-trimming. However, since the hot-rolled base material that needs trimming has edge quality problems such as edge cracks, there is a greater operating risk after the normalized pickling unit is put into operation. At the same time, trimming is performed after the normalized pickling is completed. Since the temperature of the hot-rolled base material has cooled to room temperature after the normalized pickling is completed, an edge heating unit is generally provided before the trimming shear. The edge is heated by flame, and the temperature is difficult to achieve uniform control. After the edge is sheared, there will be stress concentration points and poor trimming quality problems. Edge cracks occur during cold rolling, resulting in broken strips or the inability to go online for subsequent production processes.

[0032] Based on this, an embodiment of the present disclosure provides a normalizing pickling unit, which first uses a heating and shearing part to heat and shear the substrate, and then enters the normalizing furnace through a first conveying mechanism. After passing through the normalizing furnace to eliminate the stress concentration points generated during edge cutting, the substrate is passed through a second conveying mechanism into the pickling part for pickling operations. Subsequent production failures caused by edge cutting stress concentration are reduced, and the stability of cold rolling production is greatly improved.

[0033] The normalized pickling unit and the normalized pickling online trimming method are described in detail below through specific embodiments:

[0034] Reference Figure 1 As shown, in the first aspect of the present disclosure, a normalizing pickling unit is provided, including a heating and shearing section 1, a normalizing furnace 2, a pickling section 3, a first conveying mechanism 4 and a second conveying mechanism 5, the first conveying mechanism is arranged between the heating and shearing section 1 and the inlet end of the normalizing furnace 2, the second conveying mechanism 5 is arranged between the outlet end of the normalizing furnace 2 and the pickling section 3, the heating and shearing section 1 includes a heating device 11, a crescent shear 12 and a trimming shear 13, and the crescent shear 12 is arranged between the heating device 11 and the trimming shear 13.

[0035] The present disclosure first uses the heating and shearing part 1 to heat and shear the substrate, and then enters the normalizing furnace 2 through the first conveying mechanism 4. After passing through the normalizing furnace 2 to eliminate the stress concentration point generated during trimming, it enters the pickling part 3 through the second conveying mechanism 5 for pickling. Heating and shearing are first performed and then pickling is performed, so that subsequent production failures caused by trimming stress concentration are reduced, and the stability of cold rolling production is greatly improved. Furthermore, a dryer 6 is provided at the outlet of the normalizing furnace 2. .

[0036] In some embodiments, the pickling section 3 of the present disclosure is provided with a shot blasting machine 31 , a pickling mechanism 32 , a rinsing mechanism 33 and a drying mechanism 34 from the beginning to the end, and the drying mechanism 34 is connected to the coiler 8 through the third conveying mechanism 7 .

[0037] Specifically, the substrate of the present disclosure is transported to the welding machine by the uncoiler and then heated and sheared after welding. This process and the applied devices are conventional settings of the prior art and will not be described here. The first conveying mechanism 4, the second conveying mechanism 5 and the third conveying mechanism 7 in the embodiment of the present disclosure include conventional conveying mechanism processes of existing normalized pickling units such as tension rollers, second uncoilers, inlet loopers, and deviation correction rollers. The selection and method of the specific conveying mechanism are adaptively set according to the actual needs of the normalized pickling unit, and the present disclosure does not specifically limit it.

[0038] In some embodiments, a cross-cutting shear 9 and a surface inspector 10 are provided at the inlet side of the coiler, and the cross-cutting shear 9 is provided between the coiler 8 and the surface inspector 10 to improve production quality.

[0039] like Figure 2 As shown, in a second aspect of the present disclosure, a method for online trimming of normalized pickling is provided, which is applied to the above-mentioned normalized pickling unit, comprising:

[0040] The hot-rolled base material is selected and the hot-rolled base material is welded by a welding machine;

[0041] Heating the hot-rolled substrate, using a heating device to heat the hot-rolled substrate;

[0042] Hot rolled substrate shearing, the shearing mechanism performs trimming operations according to the set target size;

[0043] Normalizing furnace operation, the hot rolled substrate is sheared by the shearing mechanism and enters the normalizing furnace for normalizing operation;

[0044] Pickling operation: the hot rolled substrate passes through the normalizing furnace and enters the pickling section for pickling operation;

[0045] After the production is completed, the pickled steel is taken out through the coiler to complete the normal pickling production.

[0046] In the method, the present invention first heats the hot-rolled substrate by a heating device, and the workability of the heated hot-rolled substrate is improved. After passing through the heating device, the hot-rolled substrate is sheared by a shearing mechanism. Specifically, the weld will stay at the edge of the crescent shear to shear the large crescent, and the trimming shear will adjust the width offline and online. When the hot-rolled substrate with the large crescent enters the trimming shear area, the hot-rolled substrate stops running, and the trimming shear will enter the line according to the set target width. After the line is entered, the hot-rolled substrate runs through the trimming shear, and the trimming operation is completed. Then the hot-rolled substrate enters the entrance looper, normalizing furnace, pickling section, and coiler to complete the normalizing and pickling production. The method disclosed in the present invention first heats and shears and then pickles, so that subsequent production failures caused by trimming stress concentration are reduced, and the stability of cold rolling production is greatly improved.

[0047] In some embodiments, the heating device is configured as a longitudinal magnetic electromagnetic induction heating device.

[0048] In this embodiment, the longitudinal magnetic electromagnetic induction heating device is compared with the traditional flame edge heating device. The traditional flame heating device can only heat the edge, and the heating temperature can only reach 70°C. The uniformity of heating the edge of the hot-rolled substrate cannot be guaranteed. The temperature drop of the hot-rolled substrate is faster when only the edge is heated. The temperature of the hot-rolled substrate can only reach 50°C before entering the trimming shear, and the flame heating cannot adjust the temperature according to different steel types.

[0049] The longitudinal magnetic electromagnetic induction heating device heats the hot-rolled substrate plate, and the heating temperature can reach 120°C. The longitudinal magnetic electromagnetic induction heating device heats the hot-rolled substrate plate, which can ensure the uniformity of heating. At the same time, the temperature of the hot-rolled substrate plate drops slowly after being heated, and the temperature of the hot-rolled substrate can reach 110°C before entering the trimming shear.

[0050] Furthermore, the difference between the longitudinal magnetic electromagnetic induction heating device and the transverse magnetic electromagnetic induction heating device is that the direction of the magnetic field is different. Transverse magnetism and longitudinal magnetism are two different directions of magnetized electrothermal materials for heating. Transverse magnetic heating refers to the process in which the spontaneously polarized molecules in the magnetized electrothermal material vibrate in the transverse direction under the transverse action of the magnetic field, generating friction and heating. Transverse magnetic heating technology is usually used for heating small items such as integrated circuits, electronic devices, and biochemical reagents. Longitudinal magnetic heating refers to the process in which the spontaneously polarized molecules in the magnetized electrothermal material vibrate in the longitudinal direction under the longitudinal action of the magnetic field, generating friction and heating. Longitudinal magnetic heating is used to heat large objects such as metal billets. Compared with the transverse magnetic electromagnetic induction heating device, the longitudinal magnetic electromagnetic induction heating device is more suitable for heating hot-rolled substrates and can meet the process requirements of heating first and then cutting edges.

[0051] In some embodiments, the heating temperature of the longitudinal magnetic electromagnetic induction heating device is set to 70 degrees to 120 degrees. In this embodiment, the longitudinal magnetic electromagnetic induction heating device can dynamically adjust the heating temperature according to different steel grades, and the heating temperature can be automatically adjusted from 70°C to 120°C according to the different components of the steel grade to ensure the trimming quality of different steel grades.

[0052] In some embodiments, the heating temperature is set to 100 degrees. According to statistics, when the temperature of the hot-rolled substrate to be trimmed reaches 100 degrees Celsius, the edge processing performance is optimal and the trimming quality is greatly improved.

[0053] In some embodiments, the welder is configured as a laser welder. In this embodiment, laser welding utilizes high-energy laser pulses to locally heat a material in a small area. The energy of the laser radiation diffuses to the inside of the material through heat conduction, and the material is melted to form a specific molten pool. Spot welding, butt welding, lap welding, sealing welding, etc. can be achieved, with a high aspect ratio, a small weld width, a small heat-affected zone, small deformation, fast welding speed, a smooth and beautiful weld, no post-welding treatment or only simple treatment, high weld quality, no pores, precise control, small focused light spot, high positioning accuracy, and easy automation. Compared with ordinary welders, laser welders have the advantages of high efficiency and precision.

[0054] In some embodiments, the step of shearing the hot rolled substrate includes a crescent shear and a trimming shear, the weld stays at the edge of the crescent shear to shear the crescent, and then the trimming shear is used to trim the edges.

[0055] In the present disclosure, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0056] In the description of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present disclosure.

[0057] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A normalizing pickling unit, characterized in that: It includes a heating and shearing part, a normalizing furnace, a pickling part, a first conveying mechanism and a second conveying mechanism, wherein the normalizing furnace has an inlet end and an outlet end, the first conveying mechanism is arranged between the heating and shearing part and the inlet end, and the second conveying mechanism is arranged between the outlet end and the pickling part, wherein: The heating and shearing part comprises a heating device, a crescent shear and a trimming shear, wherein the crescent shear is arranged between the heating device and the trimming shear.

2. The normalizing pickling unit according to claim 1, characterized in that: A dryer is provided at the outlet end of the normalizing furnace.

3. The normalizing pickling unit according to claim 1, characterized in that: The pickling section is provided with a shot blasting machine, a pickling mechanism, a rinsing mechanism and a drying mechanism from the beginning to the end, and the drying mechanism is connected with the coiler through the third conveying mechanism.

4. The normalizing pickling unit according to claim 1, characterized in that: A cross-cutting shear and a surface inspection instrument are provided at the inlet side of the coiler, and the cross-cutting shear is provided between the coiler and the surface inspection instrument.

5. A method for normalized pickling online trimming, characterized in that: The normalizing pickling unit applied to any one of claims 1 to 4 comprises: A hot-rolled base material is selected, and the hot-rolled base material is welded by a welding machine; Heating the hot-rolled substrate, using a heating device to heat the hot-rolled substrate; Hot rolled substrate shearing, the shearing mechanism performs trimming operations according to the set target size; Normalizing furnace operation, the hot-rolled substrate sheared by the shearing mechanism enters the normalizing furnace for normalizing operation; Pickling operation, the hot-rolled substrate passing through the normalizing furnace enters the pickling section for pickling operation; After the production is completed, the steel that has undergone the pickling operation is taken out by a coiler to complete the normalized pickling production.

6. The method for normalized pickling online trimming according to claim 5, characterized in that: The heating device is configured as a longitudinal magnetic electromagnetic induction heating device.

7. The method for normalized pickling online trimming according to claim 6, characterized in that: The heating temperature of the longitudinal magnetic electromagnetic induction heating device is set to 70 degrees to 120 degrees.

8. The method for normalized pickling online trimming according to claim 7, characterized in that: The heating temperature is set to 100 degrees.

9. The method for normalized pickling online trimming according to claim 1, characterized in that: The welder is configured as a laser welder.

10. The method for normalized pickling online trimming according to claim 1, characterized in that: In the step of shearing the hot-rolled substrate, a crescent shear and a trimming shear are included, the weld stays at the edge of the crescent shear to shear the crescent, and then the trimming shear is used to trim the edges.

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