Method for removing oxide layer through metal hot rolling and metal product

Abstract

The invention discloses a method for removing an oxide layer through metal hot rolling and a metal product. The method comprises the steps that a metal coil stock is unfolded, and the flatness of the metal coil stock is adjusted; the metal coil material is heated to a first preset temperature and then rolled, and the rolled metal coil material is subjected to cold drawing at the normal temperature; the metal coil material is heated to a second preset temperature and then subjected to heat preservation, and the metal coil material is cooled after heat preservation; the metal coil material is heated to a third preset temperature, straightened and then cooled; carrying out sand blasting treatment on the metal coil material to remove a surface oxide layer of the metal coil material; and the metal coil material obtained after sand blasting treatment is subjected to acid pickling, and the metal machining part is obtained. The sand blasting pretreatment is carried out on the metal coil material, so that the subsequent acid pickling process can more uniformly act on the surface of the whole metal coil material, the phenomena of black mark residue and non-uniform hardness on the surface after acid pickling are reduced, and the acid pickling yield and the acid pickling efficiency are further improved.

Description

Technical Field

[0001] The present application relates to the field of metal technology, and in particular to a method for removing an oxide layer from a metal during hot rolling and a metal product. Background Art

[0002] During the production process of hot-rolled titanium profiles, an oxide layer will form on the surface of the material due to the high temperature environment, resulting in a higher surface hardness of the titanium profile, about 480HV. This increase in hardness has an adverse effect on the subsequent stamping process and computerized numerical control (CNC) processing, mainly manifested in damage to the stamping die and reduced CNC life. In order to solve this problem, the pickling process is generally used to remove the surface oxide layer.

[0003] Pickling is a common surface treatment technology that removes the oxide layer on the surface of titanium alloy by chemical methods. However, the traditional pickling process has problems such as residual black marks on the surface and uneven hardness after pickling, which leads to low pickling yield and low pickling efficiency. Summary of the invention

[0004] The present application mainly provides a method for removing oxide layer of metal hot rolling and a metal product, so as to solve the problems of low pickling yield and low pickling efficiency.

[0005] The present application provides a method for removing an oxide layer during hot rolling of a metal, comprising:

[0006] Unrolling a metal coil and adjusting the flatness of the metal coil;

[0007] The metal coil is heated to a first preset temperature and then rolled, and the rolled metal coil is cold drawn at room temperature;

[0008] The metal coil is heated to a second preset temperature and then kept warm, and then cooled;

[0009] Heating the metal coil to a third preset temperature for straightening and then cooling;

[0010] Performing sandblasting on the metal coil to remove the surface oxide layer of the metal coil;

[0011] The metal coil material after the sandblasting treatment is pickled to obtain a metal processed part.

[0012] Wherein, the step of sandblasting the metal coil comprises:

[0013] The metal coil is sandblasted by sandblasting particles, wherein the sandblasting particles include first-grade brown corundum, and the particle size of the first-grade brown corundum is 80 mesh, 100 mesh or 120 mesh.

[0014] Wherein, the step of sandblasting the metal coil by sandblasting particles comprises:

[0015] sandblasting the metal coil with sandblasting particles at a preset sandblasting pressure and a preset sandblasting speed;

[0016] The preset sandblasting pressure ranges from 0.75 to 0.85 MPa, and the preset sandblasting speed ranges from 1.5 to 2.5 M / min.

[0017] Wherein, the step of pickling the metal coil after sandblasting comprises:

[0018] The metal coil after the sandblasting treatment is sequentially subjected to pickling treatment, neutralization treatment and cleaning treatment;

[0019] The cleaned metal coil is dried to obtain the metal processed part.

[0020] Wherein, the step of pickling the metal coil after sandblasting comprises:

[0021] The metal coil after sandblasting is pickled by a pickling water device according to a preset pickling time; the preset pickling time ranges from 6 to 8 minutes.

[0022] Wherein, the step of heating the metal coil to a first preset temperature and then rolling comprises:

[0023] Hot rolling the metal coil at the first preset temperature by a hot rolling device; the first preset temperature ranges from 810 to 830° C.;

[0024] The step of cold drawing the rolled metal coil at room temperature comprises:

[0025] The rolled metal coil is cold drawn at room temperature by cold drawing equipment.

[0026] Wherein, the step of heating the metal coil to a second preset temperature and then keeping the temperature constant comprises:

[0027] Annealing and heat-keeping the metal coil according to the second preset temperature and preset time by an annealing device;

[0028] The second preset temperature ranges from 710 to 730° C., and the preset time ranges from 4 to 5 minutes.

[0029] Wherein, argon gas is added into the annealing equipment, and the inflow parameter range of the argon gas is between 270 and 330 L / h.

[0030] Wherein, the step of heating the metal coil to a third preset temperature for straightening and then cooling comprises:

[0031] The metal coil is heated and adjusted according to the third preset temperature by a heat straightening device; the third preset temperature ranges from 560 to 720°C.

[0032] The present application also provides a metal product, which is prepared by the above method.

[0033] The beneficial effects of the present application are as follows: the method for removing the oxide layer by hot rolling of the metal of the present application comprises: unfolding the metal coil and adjusting the flatness of the metal coil; heating the metal coil to a first preset temperature and then rolling it, and cold drawing the rolled metal coil at room temperature; heating the metal coil to a second preset temperature and then keeping it warm, and cooling the metal coil after keeping it warm; heating the metal coil to a third preset temperature and straightening it and then cooling it; sandblasting the metal coil to remove the surface oxide layer of the metal coil; pickling the sandblasted metal coil to obtain a metal workpiece. The present application adds a sandblasting step before pickling the metal coil, and the surface of the sandblasted metal coil is more uniform. By pre-treating the metal coil with sandblasting, the subsequent pickling process can act more evenly on the surface of the entire metal coil, reducing the residual black marks on the surface after pickling and the uneven hardness phenomenon, thereby improving the pickling yield and pickling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0035] Figure 1 It is a schematic flow chart of an embodiment of a method for removing an oxide layer from metal hot rolling provided by the present application;

[0036] Figure 2 yes Figure 1 A schematic diagram of a flow chart of an embodiment of step S200;

[0037] Figure 3 yes Figure 1 FIG. 5 is a flow chart of an embodiment of step S600 in FIG. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0041] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be connected between, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] Pickling is a common surface treatment technology that removes the oxide layer on the surface of titanium alloy by chemical methods. However, the traditional pickling process has problems such as residual black marks on the surface and uneven hardness after pickling, which leads to low pickling yield and low pickling efficiency.

[0047] This application provides a method for removing the oxide layer of metal hot rolling, see Figure 1 As shown, Figure 1 The present invention provides a method for removing an oxide layer by hot rolling of a metal according to an embodiment of the present invention. The method for removing an oxide layer by hot rolling of a metal according to the present embodiment includes:

[0048] Step S100: Unroll the metal coil and adjust the flatness of the metal coil.

[0049] Among them, metal coils refer to metal materials supplied in coils, which are products made of metal materials rolled into a cylindrical shape. Common ones include steel coils, aluminum coils, copper coils, etc. Metal coils can be made of various metals, including but not limited to carbon steel, stainless steel, aluminum alloy, copper alloy, titanium alloy, etc.

[0050] Optionally, the metal coil in this embodiment is a metal material made of titanium alloy, specifically a titanium coil of Ti-6AL-4V material with a diameter of 14.0 mm.

[0051] Unwinding metal coils refers to the process of unfolding coiled metal materials from a coiled form into a flat plate or strip, also known as uncoiling.

[0052] Unwinding metal coils is usually done using an unwinding machine, a piece of equipment specifically designed to unwind metal coils that can hold and unwind metal coils weighing several tons.

[0053] Adjusting the flatness of metal coils means treating the surface of the metal coils to eliminate or reduce the unevenness, corrugation, warping or other forms of deformation on the surface of the metal coils so that they reach a certain flat state, which is also called straightening.

[0054] The equipment commonly used to adjust the flatness of metal coils is a leveler (also called a leveler or a flattener), which applies pressure to the metal coil through a series of precisely arranged rollers to eliminate the unevenness of the metal coil.

[0055] Specifically, the metal coil is first unrolled using an unwinding machine, and then the flatness of the unrolled metal coil is adjusted using a leveling machine.

[0056] Step S200: heating the metal coil to a first preset temperature and then rolling it, and cold drawing the rolled metal coil at room temperature.

[0057] Heating the uncoiled and straightened metal coil to a first preset temperature and then rolling is a key step in the metal hot rolling process. This process involves heating the metal coil to a preset first preset temperature and then plastically deforming the metal coil by rolling to achieve the desired shape and size.

[0058] The first preset temperature refers to a specific temperature that is preset according to the type of the metal coil and the rolling requirements during the hot rolling process of the metal coil.

[0059] Cold drawing of rolled metal coils at room temperature is a metal processing process, the purpose of which is to apply tension at room temperature to cause plastic deformation of the metal, thereby improving the mechanical properties and dimensional accuracy of the material.

[0060] For further information, see Figure 2 As shown, Figure 2 yes Figure 1 The flowchart of an embodiment of step S200 is shown in FIG. 1 , wherein step S200 includes:

[0061] Step S201: hot rolling a metal coil at a first preset temperature using a hot rolling device.

[0062] The hot rolling device is a general term for a series of mechanical equipment and facilities used in the metal hot rolling process. Optionally, the hot rolling device includes a hot rolling furnace and a hot rolling mill.

[0063] Specifically, the uncoiled and straightened metal coil is heated by a hot rolling furnace, the temperature of the hot rolling furnace is controlled within a first preset temperature, and then the heated metal coil is put into a hot rolling mill to perform hot rolling on the metal coil.

[0064] Optionally, the first preset temperature ranges from 810 to 830°C. For example, the first preset temperature may be 810°C, 815°C, 820°C, 825°C or 830°C.

[0065] Optionally, the metal coil is hot-rolled by a hot rolling die to process the metal coil into a designed size. For example, a metal coil with a diameter of 14.0 mm is processed by a hot rolling die to become a strip-shaped metal coil with a length of 20.90 mm and a width of 4.85 mm.

[0066] Optionally, after the metal coil is preliminarily hot-rolled by the hot rolling mill, the hot rolling die is switched to a forming die, and the metal coil after the preliminarily hot rolling is hot-formed by the forming die to be processed into a designed size. For example, a strip-shaped metal coil with a length of 20.90 mm and a width of 4.85 mm after the preliminarily hot rolling is processed into a strip-shaped metal coil with a length of 18.45 mm and a width of 3.44 mm by a forming die.

[0067] Step S202: cold-drawing the rolled metal coil at room temperature using a cold-drawing device.

[0068] Among them, cold drawing equipment refers to mechanical equipment used to realize the metal cold drawing process. Its main function is to make the metal produce plastic deformation by applying a tensile force exceeding the yield point of the material under normal temperature conditions, thereby increasing the yield strength of the material and saving materials. Cold drawing equipment includes but is not limited to electric winches, cold drawing fixtures and pulley blocks.

[0069] Optionally, the hot-formed metal coil is put into a cold-drawing device, and the cold-drawing device is used to perform cold-drawing forming, so as to process the metal coil into a designed size. For example, a hot-formed strip-shaped metal coil with a length of 18.45 mm and a width of 3.44 mm is processed into a strip-shaped metal coil with a length of 18.20 mm and a width of 3.20 mm by a cold-drawing device.

[0070] Step S300, heating the metal coil to a second preset temperature and then keeping the temperature, and then cooling the metal coil.

[0071] The process of heating the metal coil to a second preset temperature and then keeping it warm, and then cooling the metal coil is also called the metal heat treatment process.

[0072] Metal heat treatment is a materials processing technique that heats and cools metals to change their physical and chemical properties, thereby improving their properties or preparing them for subsequent processing.

[0073] Metal heat treatment usually involves three steps: heating, heat preservation and cooling. For example, heating means heating the metal coil to a second preset temperature, which is preset according to the characteristics of the metal coil and the required heat treatment effect; heat preservation means that the metal coil is kept at the second preset temperature for a period of time; cooling means cooling the metal coil at a certain cooling rate, which includes air cooling and controlled cooling.

[0074] The second preset temperature is usually higher than the room temperature but lower than the melting point of the metal coil to ensure that the metal coil does not melt during the heat treatment process.

[0075] Furthermore, the step of heating the metal coil to a second preset temperature and then keeping the temperature warm includes: annealing and keeping the metal coil warm according to the second preset temperature and for a preset time by an annealing device.

[0076] Annealing is a metal heat treatment process. Annealing equipment refers to a series of mechanical equipment used to perform metal annealing processes. Their main function is to heat the metal to a specific temperature, keep it for a certain period of time, and then cool it at a controlled rate to change the physical and chemical properties of the metal, thereby improving the performance of the metal or preparing it for subsequent processing.

[0077] Optionally, the second preset temperature ranges from 710 to 730° C., and the preset time ranges from 4 to 5 minutes. For example, the second preset temperature may be 710° C., 715° C., 720° C., 725° C., or 730° C.; and the preset time may be 4 minutes, 4.2 minutes, 4.5 minutes, 4.7 minutes, or 5 minutes.

[0078] The hot-formed metal coil is placed in the annealing equipment, and the temperature of the annealing equipment is controlled at a second preset temperature. After the metal coil is heated to the second preset temperature, it is kept warm for a preset time. For example, if an annealing furnace with a length of 8 meters is used, the second preset temperature is 720°C, and the preset annealing and heat preservation time is 4-5 minutes.

[0079] Optionally, argon gas is added into the annealing equipment, and the inflow parameter range of the argon gas is 270 to 330 L / h.

[0080] Argon is an inert gas that provides a non-reactive atmosphere to protect the metal coil from oxidation and other chemical reactions during heating and cooling.

[0081] By precisely controlling the flow rate of argon gas, i.e. the inflow parameters, the annealing process can be optimized and the properties and quality of the metal coil can be improved.

[0082] Step S400: heating the metal coil to a third preset temperature, straightening it, and then cooling it.

[0083] The process of heating the metal coil to the third preset temperature for straightening and then cooling is also called a heat straightening process.

[0084] Hot straightening is a metalworking technique used to correct the bends, twists or warps of metal profiles during the processing process, where the processing process includes the above-mentioned rolling, cold drawing and annealing. Hot straightening is achieved by controlled heating and cooling, mainly using the increased plasticity of metal coils at high temperatures to correct the shape.

[0085] The third preset temperature refers to a specific temperature to which the metal coil is heated during the heat straightening process, and this temperature is preset according to the type of the metal coil and the straightening requirements.

[0086] Furthermore, the step of heating the metal coil to a third preset temperature for straightening and then cooling includes: heating and adjusting the metal coil according to the third preset temperature by a heat straightening device.

[0087] The third preset temperature ranges from 560°C to 720°C. For example, the third preset temperature may be 560°C, 570°C, 580°C, 590°C, 600°C, 610°C or 620°C.

[0088] Thermal straightening equipment refers to equipment used to straighten metal coils under high temperature conditions. This equipment uses the increased plasticity of the metal in a heated state to correct its shape so that it reaches a certain straightness and accuracy. Optionally, the thermal straightening equipment is a thermal straightening machine.

[0089] A heat straightening machine is a device used to straighten metal coils at high temperatures. A heat straightening machine usually includes heating elements, straightening rollers, cooling systems, etc., and can automatically or semi-automatically complete the entire process of heating, straightening and cooling.

[0090] Specifically, the annealed metal coil is put into a heat straightening machine, the temperature of the heat straightening machine is controlled at a third preset temperature, for example, the temperature is controlled at 590° C., and the heat straightening machine heats and straightens the metal coil.

[0091] Optionally, the heating and straightening time of the metal coil can be set to 39 seconds. Further, the metal coil after heating and straightening is cooled, and the cooling time can be set to 75 seconds.

[0092] Step S500: sandblasting the metal coil to remove the surface oxide layer of the metal coil.

[0093] Among them, sandblasting is a surface treatment technology that uses high-speed abrasive particles to impact the surface of metal coils to achieve the purpose of cleaning, roughening, removing oxide layers, relieving stress or changing the surface shape. Sandblasting usually requires the use of sandblasting equipment, including but not limited to automatic sandblasting machines, pressure sandblasting machines, vacuum sandblasting machines, circulating sandblasting machines, etc.

[0094] Abrasive particles include, but are not limited to, copper ore sand, quartz sand, corundum, iron sand, glass beads, zirconium oxide, ceramic beads, and the like.

[0095] Specifically, the heat-straightened metal coil is sprayed with abrasive particles onto the surface of the metal coil by a high-speed jet beam, which can effectively remove the oxide layer and other contaminants on the surface of the metal coil.

[0096] Furthermore, the step of sandblasting the metal coil includes: sandblasting the metal coil using sandblasting particles.

[0097] The sandblasting particles include first-grade brown corundum, and the particle size of the first-grade brown corundum is 80 mesh, 100 mesh or 120 mesh.

[0098] The sandblasting particles are the abrasive particles mentioned above. Optionally, the sandblasting particles are first-grade brown corundum.

[0099] In this embodiment, the first-grade brown corundum is used as the sandblasting particles in the sandblasting of the metal coil. Since the first-grade brown corundum can penetrate into the holes and pits on the surface of the metal coil and reach the bare surface of the metal during the sandblasting process, it can effectively remove the oxide layer on the surface of the metal coil. In addition, the unique particle size of the first-grade brown corundum ensures that more effective particles hit the surface of the metal coil, so the use of the first-grade brown corundum sand can greatly reduce the loss of sandblasting particles.

[0100] Optionally, the particle size of the primary brown corundum is 80 mesh. In other embodiments, the particle size of the primary brown corundum is 100 mesh or 120 mesh.

[0101] The 80-mesh first-grade brown corundum has a coarser particle size, so it has a stronger impact force during the sandblasting process and can more effectively remove the oxide layer on the surface of the metal coil; and because of its large particle size, its wear rate is relatively low, so it has a longer life and is more economical during use.

[0102] Further, the step of sandblasting the metal coil by sandblasting particles includes:

[0103] The metal coil is blasted with blasting particles at a preset blasting pressure and a preset blasting speed.

[0104] The preset sandblasting pressure ranges from 0.75 to 0.85 MPa, and the preset sandblasting speed ranges from 1.5 to 2.5 M / min. For example, the preset sandblasting pressure may be 0.75 MPa, 0.77 MPa, 0.80 MPa, 0.83 MPa or 0.85 MPa; the preset sandblasting speed may be 1.5 M / min, 1.7 M / min, 2 M / min, 2.3 M / min or 2.5 M / min.

[0105] The blasting pressure and blasting speed are preset according to the material properties and surface treatment requirements of the metal coil.

[0106] Optionally, the preset sandblasting pressure is 0.8 Mpa, and the preset sandblasting speed is 2 M / min.

[0107] The heat-straightened metal coil is put into a special sandblasting machine for sandblasting of the oxide layer on the surface. The sandblasting particles are sprayed onto the surface of the metal coil through a spray gun at a preset sandblasting pressure of 0.8Mpa and a preset sandblasting speed of 2M / min. The impact of the sandblasting particles removes the oxide layer on the surface of the metal coil and provides a certain surface roughness.

[0108] Optionally, during the sandblasting process, the spray gun or the metal coil is moved at a constant speed to ensure that the entire surface of the metal coil is treated evenly.

[0109] Optionally, multiple spray guns are provided to ensure that the blasting particles are sprayed all-roundly on the surface of the metal coil.

[0110] This embodiment uses a preset sandblasting pressure to ensure that the first-grade brown corundum particles have enough kinetic energy to impact the surface of the metal coil, remove the oxide layer without causing excessive erosion to the metal coil itself. By using a preset sandblasting speed, that is, the moving speed of the spray gun or the metal coil is moderate, both the efficiency of the sandblasting treatment and the uniformity of the effect after the sandblasting treatment can be ensured.

[0111] Step S600: pickling the metal coil after the sandblasting treatment to obtain a metal processed part.

[0112] Among them, pickling is a metal surface treatment process, which is mainly used to remove oxide scale, rust, old coating and other impurities on the metal surface.

[0113] The principle of pickling the metal coil after sandblasting in this embodiment is to use the acid in the pickling solution to chemically react with the oxide on the surface of the metal coil to generate soluble salts, thereby removing the oxide layer on the surface of the metal coil.

[0114] The pickling solution includes but is not limited to sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid and citric acid, etc. The pickling solution can be selected according to the type of metal coil and the processing requirements.

[0115] Optionally, the method of pickling the metal coil after the sandblasting includes but is not limited to immersing the metal coil in a pickling solution or spraying the surface of the metal coil with the pickling solution.

[0116] In this embodiment, the metal coil after sandblasting is pickled, which can not only thoroughly clean the surface of the metal coil, improve its corrosion resistance and coating adhesion, but also improve the physical properties and appearance of the metal coil.

[0117] For further information, see Figure 3 As shown, Figure 3 yes Figure 1 The flowchart of an embodiment of step S600 is shown in FIG. 1 , wherein step S600 includes:

[0118] Step S601, sequentially performing pickling treatment, neutralization treatment and cleaning treatment on the metal coil after sandblasting.

[0119] Among them, neutralization treatment is used to neutralize the acidic residue on the surface of the metal coil to prevent corrosion during subsequent processing or storage. Cleaning treatment is used to remove residual acid, neutralization liquid and any other residue on the surface of the metal coil.

[0120] Optionally, the metal coil after sandblasting is first immersed in a pickling tank; then the metal coil is taken out of the pickling tank and immersed in a neutralization tank, which contains an alkaline solution, such as sodium carbonate or sodium hydroxide solution, to neutralize the acidic substances remaining on the surface of the metal coil; then the neutralized metal coil is placed in a clean water tank for cleaning to remove all residues on the surface of the metal coil.

[0121] Step S602: Dry the cleaned metal coil to obtain a metal processed part.

[0122] Drying is used to remove moisture from the surface of metal coils to prevent secondary corrosion caused by moisture or affect the adhesion of subsequent coatings.

[0123] Metalworking parts refer to metal parts or products manufactured or modified by various metalworking technologies. Optionally, metalworking parts are metal products obtained by unwinding and straightening metal coils, hot rolling, hot forming, cold drawing, annealing, hot straightening, sandblasting, pickling and other processing technologies.

[0124] Optionally, the cleaned metal coil is passed through a drying furnace or blown dry with hot air to quickly evaporate moisture on the surface of the metal coil to obtain a metal workpiece.

[0125] In this embodiment, the metal coil is subjected to pickling, neutralization, cleaning and drying in sequence, so that the surface of the metal coil is thoroughly cleaned and pre-treated, providing a basis for manufacturing high-quality metal workpieces.

[0126] Furthermore, the step of pickling the metal coil after the sandblasting treatment includes:

[0127] The metal coil after sandblasting is pickled by the pickling water flow device according to the preset pickling time.

[0128] The preset pickling time is 6 to 8 minutes. For example, the preset pickling time can be 6 minutes, 6.5 minutes, 7 minutes, 7.5 minutes or 8 minutes.

[0129] Among them, the pickling water device is a device used for metal surface treatment, and its main function is to use acidic solution to remove oxides on the metal surface.

[0130] Optionally, the pickling water flow device is also called a pickling line, including but not limited to a pickling tank for pickling treatment, a neutralization tank for neutralization treatment, a cleaning tank for cleaning treatment, a drying tank for drying treatment, etc.

[0131] Optionally, the metal coil is pickled according to a preset pickling time. The length of the pickling time will affect the sufficiency of the reaction and the pickling effect, and needs to be adjusted according to factors such as the material, size and surface state of the metal coil.

[0132] Optionally, the preset pickling time is 7 minutes.

[0133] In this embodiment, the pickling water device is used to pickle the metal coil according to the preset pickling time, which not only improves the production efficiency and product quality, but also contributes to environmental protection and operational safety.

[0134] The present application also provides a metal product, which is prepared by the method for removing the oxide layer by hot rolling of metal in the above embodiment. The metal product includes but is not limited to titanium profiles, aluminum profiles, steel profiles, etc.

[0135] To summarize, the present application adds a sandblasting step before pickling the metal coil. The surface of the metal coil treated with sandblasting is more uniform. By pre-treating the metal coil with sandblasting, the subsequent pickling process can act more evenly on the surface of the entire metal coil, reducing the residual black marks and uneven hardness on the surface after pickling, thereby improving the pickling yield and pickling efficiency.

[0136] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for removing oxide layer during hot rolling of metal, characterized in that: include: Unrolling a metal coil and adjusting the flatness of the metal coil; The metal coil is heated to a first preset temperature and then rolled, and the rolled metal coil is cold drawn at room temperature; The metal coil is heated to a second preset temperature and then kept warm, and then cooled; Heating the metal coil to a third preset temperature for straightening and then cooling; Performing sandblasting on the metal coil to remove the surface oxide layer of the metal coil; The metal coil material after the sandblasting treatment is pickled to obtain a metal processed part.

2. The method according to claim 1, characterized in that The step of sandblasting the metal coil comprises: The metal coil is sandblasted by sandblasting particles, wherein the sandblasting particles include first-grade brown corundum, and the particle size of the first-grade brown corundum includes 80 mesh, 100 mesh or 120 mesh.

3. The method according to claim 2, characterized in that The step of sandblasting the metal coil by sandblasting particles comprises: sandblasting the metal coil with sandblasting particles at a preset sandblasting pressure and a preset sandblasting speed; The preset sandblasting pressure ranges from 0.75 to 0.85 MPa, and the preset sandblasting speed ranges from 1.5 to 2.5 M / min.

4. The method according to any one of claims 1 to 3, characterized in that: The step of pickling the metal coil after sandblasting comprises: The metal coil after the sandblasting treatment is sequentially subjected to pickling treatment, neutralization treatment and cleaning treatment; The cleaned metal coil is dried to obtain the metal processed part.

5. The method according to claim 3, characterized in that: The step of pickling the metal coil after sandblasting comprises: The metal coil after sandblasting is pickled by a pickling water device according to a preset pickling time; the preset pickling time ranges from 6 to 8 minutes.

6. The method according to claim 1, characterized in that The step of heating the metal coil to a first preset temperature and then rolling the metal coil comprises: Hot rolling the metal coil at the first preset temperature by a hot rolling device; the first preset temperature ranges from 810 to 830° C.; The step of cold drawing the rolled metal coil at room temperature comprises: The rolled metal coil is cold drawn at room temperature by cold drawing equipment.

7. The method according to claim 1, characterized in that The step of heating the metal coil to a second preset temperature and then keeping the temperature constant comprises: Annealing and heat-keeping the metal coil according to the second preset temperature and preset time by an annealing device; The second preset temperature ranges from 710 to 730° C., and the preset time ranges from 4 to 5 minutes.

8. The method according to claim 7, characterized in that Argon is added into the annealing equipment, and the inflow parameter range of the argon is between 270 and 330 L / h.

9. The method according to claim 1, characterized in that: The step of heating the metal coil to a third preset temperature for straightening and then cooling comprises: The metal coil is heated and adjusted according to the third preset temperature by a heat straightening device; the third preset temperature ranges from 560 to 720°C.

10. A metal product, characterized in that: The metal product is prepared by the method according to any one of claims 1 to 9.

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