Titanium alloy special-shaped material production process for mobile phone physical SIM card holder

Abstract

The application discloses a titanium alloy special-shaped material production process for a mobile phone physical SIM card holder, and comprises the following steps: continuously hot-rolling titanium alloy wire rods to deform to corresponding sizes; performing acid pickling at least once before the last hot-rolling to remove the surface oxides of the wire rods; performing annealing treatment at least once after the last hot-rolling; performing cold-rolling and shape correction after the annealing to make the cross-sectional size of the product meet the final product size; performing annealing treatment at least once after the cold-rolling; performing acid pickling at least once after the cold-rolling and annealing treatment to remove the surface oxides of the wire rods; cutting after online straightening to form the final special-shaped material for the SIM card holder; and the multiple rolling and heat treatment mode solves the problem of difficult machining and forming of the titanium alloy, the shape of the wire rod is shaped through cold-rolling, the titanium alloy wire rod is shaped, and the mobile phone SIM card holder special-shaped material is formed through rolling.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of titanium alloy, in particular to a titanium alloy special-shaped material production process for a mobile phone physical SIM card holder. BACKGROUND

[0002] Titanium alloy has many advantages such as high specific strength, corrosion resistance, and strong heat resistance, and is increasingly widely used in various fields. The materials of the card slot (such as a SIM card holder, a memory card holder) and the key (such as a volume key, a shutdown key) in a traditional mobile phone are mostly plastic materials. In order to increase the appearance and metal texture, a layer of metal paint is then coated on the surface. However, due to the low strength and poor wear resistance, the card slot is easily damaged or discolored due to wear during use. With the increasingly thin design requirements of mobile phones, in order to achieve the design concept of lightness and thinness, the SIM card holder structure is generally used to replace the SIM card or the memory card. After a certain number of times of replacing the SIM card or the memory card, the SIM card slot may have problems such as poor contact pin elasticity or loose card slot, which further causes the SIM card to be in poor contact and unable to work normally, and the direct performance is that the mobile phone cannot detect the SIM card or the memory card. In addition, if a metal material is used for the card holder, the weight will inevitably be heavier, which is difficult to meet the increasingly stringent lightness requirements, and the metal material card holder has some magnetism, which will affect the communication performance of the mobile phone during long-term use. In order to solve this problem, some peers use titanium alloy to prepare a mobile phone card holder. Before the card holder is finally processed into a finished product, a titanium alloy wire is first selected, as shown in the drawing, the cross-sectional shape of the wire is widely used for a mobile phone card holder, and if mechanical processing is used, not only is the processing troublesome, but also a lot of waste is generated. Therefore, the cost of titanium alloy is already high, and the raw material waste is serious and the manufacturing of the mobile phone card holder is increased. Figure 1 SUMMARY

[0003] The purpose of the present application is to solve the above technical problems, and a titanium alloy special-shaped material production process for a mobile phone physical SIM card holder is provided, which adopts a hot rolling deformation + cold rolling correction method to obtain a flat and thin rib asymmetric shape of the card holder.

[0004] In order to achieve the above purpose, the following technical scheme is adopted in the present application: a titanium alloy special-shaped material production process for a mobile phone physical SIM card holder, comprising the following steps:

[0005] The titanium alloy wire is deformed to the corresponding size by continuous hot rolling;

[0006] At least one acid pickling is performed before the last hot rolling to remove the surface oxides of the wire;

[0007] At least one annealing treatment is performed after the last hot rolling;

[0008] ​After annealing, cold rolling is performed to make the product cross-section size meet the final product size;

[0009] After cold rolling, at least one more annealing process is performed;

[0010] After cold rolling and annealing, at least one more pickling is performed to remove the oxide on the surface of the wire;

[0011] After online straightening, cutting is performed to form the final special-shaped material for SIM card holder.

[0012] In order to ensure that the titanium alloy wire maintains the performance of titanium alloy during deformation, the preferred technical solution is that the titanium alloy wire is continuously hot-rolled seven times so that the product size is deformed to the required size, and the performance of the titanium alloy wire remains stable.

[0013] In order to make the titanium alloy wire meet the deformation requirements through hot rolling, the further preferred technical solution is that the seven hot rolling steps include at least four flat rolling machine hot rolling and at least three coiled drawing machine hot drawing.

[0014] In order to make the titanium alloy wire meet the deformation requirements through process parameters during hot rolling, the further preferred technical solution is that in the flat rolling machine hot rolling step, the titanium alloy wire is rolled in a 350 flat rolling machine in an 18m hot rolling furnace, the hot rolling furnace temperature is 880±20℃, the furnace tube is protected by argon, the rolling speed is 7±0.5m / min, and the oxygen content is <0.5%.

[0015] In order to make the titanium alloy wire meet the deformation requirements through process parameters during hot rolling, the further preferred technical solution is that in the coiled drawing machine hot drawing step, the titanium alloy wire is rolled in a 18m furnace by a coiled drawing machine, the hot rolling furnace temperature is 880±20℃, the furnace tube is protected by argon, the rolling speed is 7±0.5m / min, and the oxygen content is <0.5%.

[0016] In order to ensure the removal of the oxide on the titanium alloy wire during pickling by controlling the process parameters, the further preferred technical solution is that in the pickling step, the titanium alloy wire is pickled online, the pickling speed is 1.1±0.1m / min, the pickling time is 5±0.5min, the acid solution ratio is HNO3+HF+H2O, and the pickling downstream amount is 0.08-0.1.

[0017] In order to ensure the performance of the titanium alloy wire during annealing by controlling the process parameters, the further preferred technical solution is that in the annealing step, the titanium alloy wire is annealed in an annealing furnace, the furnace temperature is 800±10℃, the annealing speed is 0.5±0.1m / min, the furnace time is 18min, the furnace tube is filled with argon, the total argon flow is 60-100NL / min, and the oxygen content is <0.5%.

[0018] In order to form the cross-sectional size of the final product, it is further preferred that the rolling speed in the cold rolling step is 5.5±0.5 m / min, and the cold rolling mainly improves the surface strength of the wire rod, and the shape of the wire rod is shaped by cold rolling.

[0019] In order to gradually form the cross-sectional size of the final product, the deformation amount of each hot rolling is controlled, and it is further preferred that the titanium alloy wire rod is Φ13.5 mm in diameter, and is continuously hot-rolled seven times, and the size after each hot rolling is 10.5 mm*15.0 mm-7.0 mm*17.8 mm-4.9 mm*19.5 mm-4.4 mm*19.7 mm-4.15 mm*19.1 mm-3.75 mm*18.85 mm-3.4 mm*18.65 mm.

[0020] Compared with the prior art, the beneficial effects of the present application are that the multiple rolling and heat treatment method solves the problem of difficult processing and forming of titanium alloy, the titanium alloy online deformation heat treatment strengthening technology is used to control the grain morphology and organization state of the titanium alloy, the high-temperature hot rolling is used to produce the deformation induction / enhanced beta phase change effect by controlling the high temperature and deformation process parameters, the titanium alloy grain size is significantly refined, the titanium alloy organization is refined, the strength of the titanium alloy is significantly improved, the problem that the titanium alloy produced by the traditional process method cannot meet the high strength and plasticity requirements of special occasions is solved, the shape of the wire rod is shaped by cold rolling, the titanium alloy wire rod is shaped, the mobile phone SIM card holder special-shaped material is rolled, the processing amount of the mobile phone SIM card holder after subsequent engraving processing is reduced, the specific strength of the SIM card holder special-shaped material made of titanium alloy is large, and the titanium alloy has no magnetism; the titanium alloy is used to prepare the mobile phone SIM card holder special-shaped material, which has no magnetism and does not affect the communication performance of the mobile phone; the surface oxide layer of the titanium alloy is removed by pickling, and the surface performance of the titanium alloy wire rod is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a cross-sectional hot rolling deformation view of the titanium alloy SIM card holder special-shaped material of the present application. 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 a part of the embodiments of the present application, not all the embodiments.

[0023] EMBODIMENT

[0024] As Figure 1As shown, titanium alloy mobile phone physical SIM card special-shaped material production process, first hot rolling, through 350 flat rolling mill in 18m hot rolling furnace, hot rolling furnace temperature 880±20℃, furnace tube filled with argon protection, rolling speed 7±0.5m / min, oxygen content <0.5%, titanium alloy wire from Φ13.5mm wire hot rolling into flat size 10.5mm*15.0mm, due to the high strength of titanium alloy, low plasticity, large deformation is easy to adopt hot rolling, but the deformation is not easy too large, so need to be hot rolled several times;

[0025] Second hot rolling, through 350 flat rolling mill in 18m hot rolling furnace, hot rolling furnace temperature 880±20℃, furnace tube filled with argon protection, rolling speed 7±0.5m / min, oxygen content <0.5%, flat size 10.5mm*15.0mm hot rolling into flat size 7.0mm*17.8mm;

[0026] Third hot rolling, through 350 flat rolling mill in 18m hot rolling furnace, hot rolling furnace temperature 880±20℃, furnace tube filled with argon protection, rolling speed 7±0.5m / min, oxygen content <0.5%, flat size 7.0mm*17.8mm hot rolling into flat size 4.9mm*19.5mm;

[0027] Fourth hot rolling, through 350 flat rolling mill in 18m hot rolling furnace, hot rolling furnace temperature 880±20℃, furnace tube filled with argon protection, rolling speed 7±0.5m / min, oxygen content <0.5%, flat size 4.9mm*19.5mm hot rolling into flat size 4.4mm*19.7mm;

[0028] First hot drawing, through the 18m furnace rolling mill, hot rolling furnace temperature 880±20℃, furnace tube filled with argon protection, rolling speed 7±0.5m / min, oxygen content <0.5%, flat size 4.4mm*19.7mm hot rolling into flat size 4.15mm*19.1mm;

[0029] Second hot drawing, through the 18m furnace rolling mill, hot rolling furnace temperature 880±20℃, furnace tube filled with argon protection, rolling speed 7±0.5m / min, oxygen content <0.5%, flat size 4.15mm*19.1mm hot rolling into flat size 3.75mm*18.85mm;

[0030] Pickling, in-line pickling, pickling speed 1.1±0.1m / min, pickling time: 5±0.5min, acid solution ratio: HNO3+HF+H2O, pickling down flow 0.08~0.1. Remove the oxide skin produced on the surface of the wire during hot rolling to facilitate the next step of hot drawing deformation;

[0031] Third heat extraction, through the roll extraction machine in 18m furnace rolling, warm rolling furnace temperature 880±20℃, furnace tube argon protection, rolling speed 5.5±0.5m / min, oxygen content <0.5%, the size of the flat material 3.75mm*18.85mm hot rolling flat material size 3.4mm*18.65mm;

[0032] First annealing, annealing in the annealing furnace, furnace temperature 800±10℃, annealing speed 0.5±0.1m / min, in the furnace time 18min, the furnace tube is filled with argon, the total flow of gas 60-100NL / min, oxygen content <0.5%, the material properties of the wire after heat extraction are homogenized through annealing treatment, and the comprehensive performance of the titanium alloy is improved;

[0033] Cold rolling, rolling through the roll extraction machine, rolling speed 5.5±0.5m / min, cold rolling mainly improves the surface strength of the wire, and the shape of the wire is shaped through cold rolling, so that the titanium alloy is shaped into 3.0mm*18.4mm, and the cold rolling is finish rolling, and the precision reaches 0.005mm;

[0034] Second annealing, annealing in the annealing furnace, furnace temperature 800±10℃, annealing speed 0.5±0.1m / min, in the furnace time 18min, the furnace tube is filled with argon, the total flow of gas 60-100NL / min, oxygen content <0.5%, the material properties of the wire after heat extraction are homogenized through annealing treatment, and the comprehensive performance of the titanium alloy is improved;

[0035] Second pickling, online pickling, pickling speed 1.1±0.1m / min, pickling time: 5±0.5min, acid solution ratio: HNO3+HF+H2O, pickling down flow 0.08-0.1; remove the oxide skin generated on the surface of the wire during hot rolling;

[0036] Cutting, after straightening, the wire is cut online by a cutting machine to form a special-shaped material with a size of 3.0mm*18.4mm*2500mm, forming a special-shaped material for a mobile phone physical SIM card holder;

[0037] The titanium alloy is a material with high hardness and difficult to be cold deformed, and since the product is a flat thin rib and asymmetric shape, the method of hot rolling deformation and cold rolling correction is adopted to realize the method, the wire is deformed to a suitable size through continuous hot rolling and heat extraction, and then the product size is shaped through cold rolling.

[0038] The above describes only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person 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 manufacturing process for a special profile of titanium alloy mobile phone physical SIM card tray, characterized in that, Includes the following steps, The titanium alloy wire is hot-rolled online at least seven times, including at least four hot rolling on a flat mill and at least three hot drawing on a coiling mill. In the hot rolling step of the flat mill, the titanium alloy wire is rolled in an 18m hot rolling furnace at a furnace temperature of 880±20°C, with argon gas purging the furnace tubes for protection. The rolling speed is 7±0.5m / min, and the oxygen content is <0.5%. In the hot drawing rolling step of the coiling mill, the titanium alloy wire is rolled in an 18m hot rolling furnace at a furnace temperature of 880±20°C, with argon gas purging the furnace tubes for protection. The rolling speed is 7±0.5m / min, and the oxygen content is <0.5%. This process deforms the titanium alloy wire to the corresponding dimensions. Before the final hot rolling, pickling shall be performed at least once to remove oxides from the wire surface; after the final hot rolling, annealing shall be performed at least once. After annealing, cold rolling is performed to shape the product so that the cross-sectional dimensions meet the final finished product dimensions; After cold rolling, at least one more annealing treatment should be performed; After cold rolling and annealing, pickling should be performed at least once more to remove oxides from the wire surface; After online straightening, the material is cut to form the final SIM card tray-specific profile.

2. The manufacturing process of the special profile for the titanium alloy mobile phone physical SIM card tray as described in claim 1, characterized in that, In the pickling step, the pickling is performed online at a speed of 1.1 ± 0.1 m / min and a time of 5 ± 0.5 min. The acid solution ratio is HNO3 + HF + H2O.

3. The manufacturing process of the special profile for the titanium alloy mobile phone physical SIM card tray as described in claim 1, characterized in that, In the annealing step, annealing is carried out in an annealing furnace at a temperature of 800±10°C, an annealing rate of 0.5±0.1 m / min, a furnace time of 18 min, and argon gas is purged into the furnace tube at a total flow rate of 60-100 NL / min with an oxygen content of <0.5%.

4. The manufacturing process of the special profile for the titanium alloy mobile phone physical SIM card tray as described in claim 1, characterized in that, In the cold rolling step, the rolling is performed by a coiling mill at a rolling speed of 5.5 ± 0.5 m / min.

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