U-shaped mobile phone frame rolling method and mobile phone frame assembly

Abstract

The invention relates to a U-shaped mobile phone frame rolling method and a mobile phone frame assembly, and relates to the technical field of mobile phones, the rolling method comprises the following steps: heating an alloy blank with a circular section to a preset temperature, and rolling the alloy blank with the circular section to form a flat alloy blank; a U-shaped mobile phone frame semi-finished product is obtained through rolling, the U-shaped mobile phone frame semi-finished product is cut into the U-shaped mobile phone frame with the preset size, the cutting direction is parallel to the upper face portion and the lower face portion of the U-shaped mobile phone frame so that the upper face portion and the lower face portion of the U-shaped mobile phone frame can be formed, and the cutting amount is equal to the thickness of the U-shaped mobile phone frame. U-shaped section bars are produced in a continuous rolling mode, the yield can be increased, and the yield from round bars to finished section bars can reach 88% or above; one-time heating is adopted, the profile with the required size is obtained through rolling of a continuous rolling line, the production efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mobile phones, and in particular to a method for rolling a U-shaped mobile phone frame and a mobile phone frame assembly. Background Art

[0002] With the rapid development of electronic products, smart terminals such as smart wearable devices, tablet computers, and smart homes are becoming more and more popular, and people's requirements for the appearance of smart terminals are also getting higher and higher. In order to meet the requirements of slimming and refined appearance structural parts of smart terminals, surface appearance parts and internal structural parts can be made of metal materials, which can be the same material or a combination of different materials. The use of metal parts for manufacturing can improve the structural strength of the mobile phone.

[0003] Titanium and titanium alloy profiles are a near-net-shaped structural material that can be used directly as structural parts without machining or after a small amount of machining. They have high structural efficiency, various advantages of titanium alloy materials, and excellent comprehensive performance. They are widely needed in aviation, aerospace, marine engineering, weapons industry, electronics industry, chemical equipment, civil infrastructure and other fields, and have great market potential.

[0004] The current status of titanium and titanium alloy profile research in my country: (1) In recent years, my country has been active in the research of profile production technology, and most of the research focuses on the research of extrusion molding technology and the simulation of the molding process. However, due to the high yield strength ratio, large deformation resistance and narrow hot processing window of titanium alloy materials, there are still many process problems, which restrict the production and application of profiles. (2) Although my country has mastered the hot extrusion molding technology of some simple cross-section titanium alloy profiles, the produced profiles have poor dimensional accuracy and serious surface defects. A lot of post-processing is required to barely meet the customer's requirements. So far, a stable production process has not been formed. There has been a long-term lack of standardized technical requirements and consistent quality inspections, resulting in uneven product quality of titanium and titanium alloy profiles and lack of competitiveness in the application market. (3) Titanium alloy profiles for aviation and aerospace with harsh service conditions still rely mainly on imports, and some specifications and models of aviation profiles are still subject to import restrictions by developed countries.

[0005] To sum up, although my country has mastered the production technology of some simple cross-section titanium alloy extrusion profiles, it has not yet formed a stable batch production technology for titanium and titanium alloy profiles. The production cost remains high, the batch stability is poor, and it lacks market competitiveness, which cannot meet the market's growing demand for titanium and titanium alloy profiles.

[0006] Although my country has mastered the hot extrusion forming technology for some simple cross-section titanium alloy profiles, the produced profiles have poor dimensional accuracy and serious surface defects, and require a lot of post-processing to barely meet customer requirements. So far, a stable production process has not been formed. There has been a long-term lack of standardized technical requirements and consistent quality inspections, resulting in uneven product quality of titanium and titanium alloy profiles and a lack of competitiveness in the application market. Summary of the invention

[0007] The purpose of the present invention is to overcome the defects in the prior art and provide a U-shaped mobile phone frame rolling method and a mobile phone frame assembly.

[0008] To achieve the above-mentioned purpose, the technical solution of the present invention is to design a U-shaped mobile phone frame rolling method, wherein the mobile phone includes two side edges, a top, a bottom, an upper surface and a lower surface, the distance between the upper surface and the lower surface of the mobile phone is the thickness of the mobile phone, and the U-shaped mobile phone frame includes two side portions and a frame body portion located between the two side portions; when the U-shaped mobile phone frame is installed on the mobile phone, the two side edges of the mobile phone are connected to the two side portions in a one-to-one correspondence, and the top or bottom of the mobile phone is connected to the frame body portion; the thickness of the U-shaped mobile phone frame is determined according to the thickness of the mobile phone, and the upper and lower portions of the U-shaped mobile phone frame correspond to the upper and lower surfaces of the mobile phone, and it is characterized in that the rolling method comprises: The alloy blank with a circular cross section is heated to a predetermined temperature, and the alloy blank with a circular cross section is formed into a flat alloy blank by rolling; and then a U-shaped mobile phone frame semi-finished product is obtained by rolling; The U-shaped mobile phone frame semi-finished product is cut into the U-shaped mobile phone frame of a predetermined size, and the cutting direction is parallel to the upper part and the lower part of the U-shaped mobile phone frame to form the upper part and the lower part of the U-shaped mobile phone frame, and the cutting amount is equal to the thickness of the U-shaped mobile phone frame.

[0009] A further preferred technical solution, before the step of heating the alloy blank to a predetermined temperature, further comprises: The surface material of the alloy billet is removed.

[0010] A further preferred technical solution, before the step of cutting the U-shaped mobile phone frame semi-finished product into the U-shaped mobile phone frame of a predetermined size, further comprises: The U-shaped mobile phone frame semi-finished product is subjected to annealing treatment.

[0011] According to a further preferred technical solution, the annealing treatment is performed by an annealing furnace, the annealing temperature is 770±60° C., and the time in the furnace during the annealing process is greater than or equal to 10 minutes.

[0012] A further preferred technical solution, after executing the step of annealing the semi-finished U-shaped mobile phone frame, further includes: Thermal straightening of semi-finished U-shaped mobile phone frame products.

[0013] A further preferred technical solution, after executing the step of heat straightening the U-shaped mobile phone frame semi-finished product, further includes: The semi-finished U-shaped mobile phone frame is subjected to shot blasting and pickling treatment.

[0014] According to a further preferred technical solution, the titanium alloy billet is heated in a box-type resistance heating furnace at a heating temperature of 800 to 950° C. and a holding time of 60 to 10 minutes.

[0015] According to a further preferred technical solution, a bar with a diameter of 82 mm is rolled into a flat bar with a size of 24 mm thick and 68 mm wide by 6 continuous rolling processes at a rolling speed of 0.6 to 1.2 m / s.

[0016] A further preferred technical solution is to form a U-shaped mobile phone frame semi-finished product through 6 pass rolling; Rolling the flat strip alloy billet through a first profiling hole die to obtain an alloy billet with an I-shaped cross section with protruding ends; Performing a second rolling process with a second profiling hole die to obtain a U-shaped semi-finished product having a concave portion; Performing a third rolling process through a third profiling hole die to obtain a U-shaped semi-finished product with a deepened concave portion; Performing a fourth rolling process through a fourth profiling hole die to obtain a U-shaped semi-finished product having a concave-convex structure; Performing a fifth rolling process through a fifth profiling hole die to obtain a U-shaped semi-finished product having a deepened concave-convex structure; The sixth rolling is performed through the sixth contour hole die to obtain a U-shaped mobile phone frame semi-finished product.

[0017] According to a further preferred technical solution, the mobile phone frame assembly is rolled based on the U-shaped mobile phone frame rolling method described in any one of claims 1 to 9.

[0018] The advantages and beneficial effects of the present invention are that the round bar is rolled into a flat bar of the required size by the first 6 rolling mills, and then the U-shaped profile of the required size is obtained through 5 to 6 pass pass rolling. After the U-shaped profile is segmented by multiple shears, it is placed on a cooling bed for cooling. The continuous rolling method can improve the yield rate of U-shaped profiles, and the yield rate from round bars to finished profiles can reach more than 88%; one-time heating is adopted, and the profile of the required size is obtained by rolling through the continuous rolling line, which improves production efficiency and reduces costs.

[0019] 3. Through annealing treatment, the internal stress accumulated during the rolling process is reduced, and through subsequent straightening treatment, the straightness can reach 1mm / m. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is one of the flow diagrams of the U-shaped mobile phone frame rolling method provided by the embodiment of the present invention; Figure 2 This is the second flow chart of the method for rolling a U-shaped mobile phone frame provided by an embodiment of the present invention; Figure 3 It is a schematic diagram of the rolling principle of the U-shaped mobile phone frame provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0022] like Figure 1 As shown, a U-shaped mobile phone frame rolling method, wherein the mobile phone includes two side edges, a top, a bottom, an upper surface and a lower surface, the distance between the upper surface and the lower surface of the mobile phone is the thickness of the mobile phone, and the U-shaped mobile phone frame includes two side portions and a frame body portion located between the two side portions; when the U-shaped mobile phone frame is installed on the mobile phone, the two side edges of the mobile phone are connected to the two side portions one by one, and the top or bottom of the mobile phone is connected to the frame body portion; the thickness of the U-shaped mobile phone frame 14 is determined according to the thickness of the mobile phone, and the upper and lower portions of the U-shaped mobile phone frame correspond to the upper and lower surfaces of the mobile phone, and the rolling method includes: Step 100, heating the alloy blank with a circular cross section to a predetermined temperature, and rolling the alloy blank with a circular cross section into a flat alloy blank; and then rolling to obtain a U-shaped mobile phone frame semi-finished product; Step 200, cutting the U-shaped mobile phone frame semi-finished product into the U-shaped mobile phone frame of a predetermined size, the cutting direction is parallel to the upper part and the lower part of the U-shaped mobile phone frame to form the upper part and the lower part of the U-shaped mobile phone frame, and the cutting amount is equal to the thickness of the U-shaped mobile phone frame.

[0023] The mobile phone frame assembly provided in the embodiment of the present invention directly adopts multiple U-shaped special-shaped rolling to obtain the U-shaped mobile phone frame semi-finished product, and then after annealing and straightening, the annealed and straightened U-shaped material is shot blasted and pickled, and the finished titanium alloy U-shaped material is obtained by cutting to a fixed length. The material utilization rate is increased to more than 52%, the shaping cost is only 10% of the normal process, and the total production cost is reduced by 30%.

[0024] In one embodiment of the present invention, before the step of heating the alloy blank having a circular cross section to a predetermined temperature, the U-shaped mobile phone frame rolling method further comprises: The surface material of the alloy blank with a circular cross section is removed, and the surface is subjected to a peeling treatment, and the peeling treatment can completely remove the surface oxide scale and defects.

[0025] The alloy blank in the present invention is a titanium alloy blank, and of course, it can also be other alloy blanks. The titanium alloy blank is preferably a rolled or radially forged titanium alloy bar.

[0026] Before rolling, the titanium alloy billet is heated in a resistance heating furnace to increase the temperature of the titanium alloy billet, reduce the hardness of the titanium alloy billet, and make the titanium alloy billet hardened evenly, which is convenient for rolling. Preferably, heating is performed in a box-type resistance heating furnace, the predetermined temperature is 800-950°C, the holding time is 60-10 minutes, and preferably, the predetermined temperature is 900°C.

[0027] The resistance heating furnace is used for conventional forging heating and high-temperature forging heating of titanium alloys, as well as annealing, solution treatment and aging heat treatment of titanium alloys of different grades. It includes a furnace body and a heating controller. The furnace body is composed of six side panels: top, bottom, left, right, front and back. The cavity in the middle forms a furnace chamber. A movable furnace door is arranged on at least one of the side panels. The furnace door rotates or moves up and down under the drive of a power device to cooperate with the furnace door opening opened on the side panel of the furnace body to be closed.

[0028] Electric heaters are arranged on the inner sides of the six side panels of the furnace body. When powered on, they generate heat to heat the furnace. The heating controller controls the power on or off of the electric heater. The existing power regulation temperature control system is adopted to meet the requirements of heating speed and uniformity. The heating process has a fast heating speed, achieves a high furnace temperature uniformity, furnace temperature stability, etc., and meets the needs of the heat treatment process.

[0029] It should be noted here that the elongation of titanium alloy is low at room temperature, but very good at high temperature. Its characteristic is that it has different elongations at different temperatures. Titanium alloy is easily oxidized at high temperatures. Therefore, the rolling of titanium alloy needs to control the rolling temperature and rolling rate to roll out products with qualified performance.

[0030] In one embodiment of the present invention, before the step of cutting the U-shaped mobile phone frame semi-finished product 15 into a U-shaped mobile phone frame of a predetermined size, the U-shaped mobile phone frame rolling method further includes: The U-shaped mobile phone frame semi-finished product 15 is subjected to annealing treatment.

[0031] Annealing treatment is carried out in an annealing furnace at a temperature of 720 to 800° C. for 40 to 80 minutes.

[0032] Annealing treatment makes the inconsistent material structure length become consistent, thereby eliminating the internal stress of the material. After annealing, the structural consistency of the material is greatly improved, and the deformation of the material is small and the residual stress is low in the subsequent processing process.

[0033] Combine the following Figure 2 A specific embodiment of the present invention is described in detail as follows. Figure 2 As shown, the rolling method includes: Step 100, removing the surface material of the alloy blank having a circular cross section; Step 200, preheating the alloy blank to a predetermined temperature; Step 300, rolling the alloy blank by a contoured roller group of a rolling device, so that the alloy blank with a circular cross-section is formed into a flat alloy blank, and then passing through a pass rolling to obtain a U-shaped mobile phone frame semi-finished product; Step 400, annealing the semi-finished U-shaped mobile phone frame; Step 500, cutting the U-shaped mobile phone frame semi-finished product into a U-shaped mobile phone frame of a predetermined size, wherein the cutting direction is parallel to the upper portion and the lower portion of the U-shaped mobile phone frame to form the upper portion and the lower portion of the U-shaped mobile phone frame, and the cutting amount is equal to the thickness of the U-shaped mobile phone frame.

[0034] In one embodiment of the present invention, after performing the step of annealing the semi-finished U-shaped mobile phone frame, the U-shaped mobile phone frame rolling method further comprises: Thermal straightening is performed on the semi-finished U-shaped mobile phone frame to ensure the straightness of the profile.

[0035] In one embodiment of the present invention, after performing the step of heat straightening the U-shaped mobile phone frame semi-finished product, the U-shaped mobile phone frame rolling method further comprises: The semi-finished U-shaped mobile phone frame is subjected to shot blasting and pickling treatment to improve the surface quality.

[0036] In one embodiment of the present invention, while performing the step of rolling the alloy blank by the profiling roller group of the rolling equipment, the U-shaped mobile phone frame rolling method also includes: Use emulsion or cooling water to lubricate the alloy billet.

[0037] Lubricating the alloy billet with emulsion or cooling water can improve the rolling accuracy and shape.

[0038] Combine the following Figure 3 One embodiment of the present invention is described in detail: a rolling equipment is composed of a two-roller horizontal and vertical alternating high-rigidity short-stress line roughing mill and 5 to 6 flat rolling mills, and the steps of rolling the alloy billet by the contoured roll group of the rolling equipment include: The alloy billet with a circular cross section is rolled by a first profiling roller group to obtain an alloy billet with an elliptical cross section and a pair of horizontal flanges; Performing a second rolling process through a second profiling roll group to obtain an alloy billet having a circular cross section and a pair of vertical flanges; The alloy billet is rolled for the third time by a third profiling roller group to obtain a flat cross-section alloy billet; Performing a fourth rolling process through a fourth profiling roll group to obtain an alloy billet having a flat cross section and a pair of vertical flanges; Performing a fifth rolling process through a fifth profiling roller group to obtain an alloy billet having a flat cross section; Performing a sixth rolling process through a sixth profiling roll group to obtain an alloy billet having a flat cross section and a pair of horizontal flanges; Then it goes through six pass rolling to form a U-shaped mobile phone frame semi-finished product.

[0039] Rolling the flat strip alloy billet through a first profiling hole die to obtain an alloy billet with an I-shaped cross section with protruding ends; A second rolling is performed through a second profiling hole die to obtain a U-shape with a concave portion; A third rolling is performed through a third profiling hole die to obtain a U-shape with a deepened concave portion; Performing a fourth rolling process through a fourth profiling hole die to obtain a U-shape having a concave-convex structure; The fifth rolling is carried out through a fifth profiling hole die to obtain a U-shape with a deepened concave-convex structure;.

[0040] The sixth rolling is performed through the sixth contour hole die to obtain a U-shaped mobile phone frame semi-finished product.

[0041] The preheated titanium alloy blank is rolled six times continuously by six groups of profiling rollers to form a flat titanium alloy blank, and then is rolled six times to form a U-shaped mobile phone frame semi-finished product. The U-shaped cross section and the rolled cross section of the existing mobile phone frame are cross sections that are perpendicular to each other. The existing mobile phone frame needs to be bent to form a U-shaped structure, while the rolling method of the present invention can be rolled into a U-shaped structure at one time without bending. That is, the original rolling method is to roll the cross section of the mobile phone frame, and the rolling method of the present invention is to roll the longitudinal section of the mobile phone frame. In the existing rolling method, the cross section needs to be cut after rolling, and then the existing mobile phone frame can be formed through bending. However, the longitudinal section is rolled by the rolling method of the present invention and then cut to form a sheet-like U-shaped mobile phone frame, thereby reducing the process steps and improving the production efficiency.

[0042] A specific embodiment of the present invention, as Figure 3As shown, in this embodiment, by preheating the titanium alloy billet before each rolling, the temperature of the semi-finished titanium alloy mobile phone frame assembly is increased, the hardness of the semi-finished titanium alloy mobile phone frame assembly is reduced, the rolling is facilitated, and uniform speed rolling can be achieved; Before the first rolling, the titanium alloy billet is heated in a resistance heating furnace to increase the temperature of the titanium alloy billet and reduce the hardness of the titanium alloy billet, making it easier to roll.

[0043] Electric heaters are arranged on the inner sides of the six side panels of the furnace body. When powered on, they generate heat to heat the furnace. The heating controller controls the power on or off of the electric heater. The existing power regulation temperature control system is adopted to meet the requirements of heating speed and uniformity. The heating process has a fast heating speed, achieves a high furnace temperature uniformity, furnace temperature stability, etc., and meets the needs of the heat treatment process.

[0044] The temperature of the preheating furnace is 940°C, the holding time is 80 minutes, the furnace tube is filled with argon gas, the total gas flow rate is 60-100NL / min, and the oxygen content is <0.5%.

[0045] The preheated titanium alloy billet is continuously rolled six times at a rolling speed of 0.6 to 1.2 m / s to be rolled into a flat bar with a size of 24 mm in thickness and 68 mm in width.

[0046] Then, the semi-finished U-shaped mobile phone frame is formed through six pass rolling, and the rolling speed is 0.8-1.5 m / s; Specifically, the flat strip alloy billet is rolled by a first profiling hole die to obtain an I-shaped structure with a length of 74 mm, a thickness of 20 mm at both ends, and a thickness of 12 mm in the middle; A second rolling is performed through a second profiling hole die to obtain a U-shaped structure with a length of 76 mm, a thickness of 21 mm at both ends, and a thickness of 10 mm in the middle; The third rolling is performed through a third profiling hole die to obtain a U-shaped structure with a length of 76 mm, a thickness of 19 mm at both ends, and a thickness of 8 mm in the middle; The fourth rolling is performed through a fourth profiling hole die to obtain a U-shaped structure with a concave and convex inner surface having a length of 80 mm, a thickness of 18.5 mm at both ends, and a thickness of 5 mm and 7 mm in the middle; The fifth rolling is performed through the fifth contoured hole die to obtain a U-shaped structure with a concave and convex inner surface having a length of 82 mm, a thickness of 18 mm at both ends, and a thickness of 5 mm and 6.5 mm in the middle.

[0047] The sixth rolling is performed through the sixth contour hole die to obtain a U-shaped mobile phone frame semi-finished product.

[0048] After rolling is completed, the U-shaped mobile phone frame semi-finished product is annealed in an annealing furnace at a temperature of 720-800°C and a holding time of 40-80 minutes to avoid cracking and uneven deformation during the rolling process and reduce the residual stress of the titanium alloy.

[0049] Emulsion or cooling water is used for lubrication during the rolling process. The rolling accuracy and shape can be improved by spraying the emulsion or cold water onto the roller or the hole mold, or by immersing the roller or the hole mold in a tank filled with emulsion or cooling water. The concentration of the emulsion used is between 6-20%, the service life of the roller or the hole mold can be increased by 2-3 times, and the smoothness of the material surface can be increased by 10-30%; directly adopt multiple U-shaped special-shaped rolling to obtain the target U-shaped shape, and after annealing and straightening, sawing is performed to obtain the finished U-shape. The titanium alloy U-shaped profile prepared by this method has a tensile strength of ≥930MPa, a yield strength of ≥800MPa, and an elongation of ≥12%.

[0050] The present invention also provides a mobile phone frame assembly, which is rolled based on the U-shaped mobile phone frame rolling method described in any one of the above embodiments.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for rolling a U-shaped mobile phone frame, wherein: The mobile phone comprises two side edges, a top, a bottom, an upper surface and a lower surface, the distance between the upper surface and the lower surface of the mobile phone is the thickness of the mobile phone, the U-shaped mobile phone frame comprises two side edges and a frame main body located between the two side edges; when the U-shaped mobile phone frame is installed on the mobile phone, the two side edges of the mobile phone are connected to the two side edges in a one-to-one correspondence, and the top or bottom of the mobile phone is connected to the frame main body; the thickness of the U-shaped mobile phone frame is determined according to the thickness of the mobile phone, and the upper and lower parts of the U-shaped mobile phone frame correspond to the upper and lower surfaces of the mobile phone, and the rolling method comprises: The alloy blank with a circular cross section is heated to a predetermined temperature, and the alloy blank with a circular cross section is formed into a flat alloy blank by rolling; and then a U-shaped mobile phone frame semi-finished product is obtained by rolling; The U-shaped mobile phone frame semi-finished product is cut into the U-shaped mobile phone frame of a predetermined size, and the cutting direction is parallel to the upper part and the lower part of the U-shaped mobile phone frame to form the upper part and the lower part of the U-shaped mobile phone frame, and the cutting amount is equal to the thickness of the U-shaped mobile phone frame.

2. The method for rolling a U-shaped mobile phone frame according to claim 1, characterized in that: Before the step of heating the alloy blank to a predetermined temperature, the method further comprises: The surface material of the alloy billet is removed.

3. The method for rolling a U-shaped mobile phone frame according to claim 2, characterized in that: Before the step of cutting the U-shaped mobile phone frame semi-finished product into the U-shaped mobile phone frame of a predetermined size, the method further comprises: The U-shaped mobile phone frame semi-finished product is subjected to annealing treatment.

4. The method for rolling a U-shaped mobile phone frame according to claim 3, characterized in that: The annealing treatment is performed in an annealing furnace, the annealing temperature is 770±60° C., and the time in the furnace during the annealing process is greater than or equal to 10 minutes.

5. The method for rolling a U-shaped mobile phone frame according to claim 1, characterized in that: After performing the step of annealing the semi-finished U-shaped mobile phone frame, the method further comprises: Thermal straightening of semi-finished U-shaped mobile phone frame products.

6. The method for rolling a U-shaped mobile phone frame according to claim 1, characterized in that: After performing the step of heat straightening the U-shaped mobile phone frame semi-finished product, the method further comprises: The semi-finished U-shaped mobile phone frame is subjected to shot blasting and pickling treatment.

7. The method for rolling a U-shaped mobile phone frame according to claim 1, characterized in that: The titanium alloy billet is heated in a box-type resistance heating furnace at a heating temperature of 800 to 950° C. and a holding time of 60 to 10 minutes.

8. The method for rolling a U-shaped mobile phone frame according to any one of claims 1 to 7, characterized in that: Through 6 continuous rolling, the rod with a diameter of 82 mm is rolled into a flat strip with a size of 24 mm thick and 68 mm wide, and the rolling speed is 0.6 to 1.2 m / s.

9. The method for rolling a U-shaped mobile phone frame according to any one of claims 1 to 7, characterized in that: The semi-finished U-shaped mobile phone frame is formed by 6 pass rolling; Rolling the flat strip alloy billet through a first profiling hole die to obtain an alloy billet with an I-shaped cross section with protruding ends; Performing a second rolling process with a second profiling hole die to obtain a U-shaped semi-finished product having a concave portion; Performing a third rolling process through a third profiling hole die to obtain a U-shaped semi-finished product with a deepened concave portion; Performing a fourth rolling process through a fourth profiling hole die to obtain a U-shaped semi-finished product having a concave-convex structure; Performing a fifth rolling process through a fifth profiling hole die to obtain a U-shaped semi-finished product having a deepened concave-convex structure; The sixth rolling is performed through the sixth contour hole die to obtain a U-shaped mobile phone frame semi-finished product.

10. A mobile phone frame assembly, characterized in that: The mobile phone frame assembly is rolled based on the U-shaped mobile phone frame rolling method described in any one of claims 1 to 9.

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