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

Abstract

The invention provides 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 steps that an alloy blank is rolled through a profiling roller set of rolling equipment to obtain a U-shaped mobile phone frame semi-finished product, the profiling roller group comprises a first roller of which the peripheral surface is provided with a convex edge and a second roller of which the peripheral surface is provided with a groove; and cutting the U-shaped mobile phone frame semi-finished product into a U-shaped mobile phone frame with a preset size, wherein the cutting direction is parallel to the upper surface part and the lower surface part of the U-shaped mobile phone frame. According to the mobile phone frame assembly provided by the embodiment of the invention, the U-shaped mobile phone frame semi-finished product is obtained by directly adopting multiple U-shaped and special-shaped rolling, then the U-shaped mobile phone frame semi-finished product is cut after being annealed and straightened, and finally the U-shaped mobile phone frame can be obtained through CNC machining and shaping, so that after CNC machining, the deformation is small, the shaping difficulty is low, and the material utilization rate is increased to 52% or above; the shaping cost is only 10% of that of a normal process, and the total production cost is reduced by 30%.

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] like Figure 1 to Figure 2 As shown, currently most metal mobile phone frame components are obtained through a combination of multiple processes, and then processed and shaped by CNC to obtain the target finished product. In order to reduce the weight of high-end mobile phones, titanium alloys are used. Titanium alloys are expensive, and using ordinary processes, the utilization rate of materials is low, the process is long, and the process difficulty is high.

[0004] Titanium metal is an ideal molding material for mobile phone frames due to its light weight, high strength, metallic luster, corrosion resistance, and high and low temperature resistance. However, it is difficult to mold, difficult to process, and has high cost. In addition, when the hardness of titanium alloy is greater than HB350, it is particularly difficult to cut. When it is less than HB300, it is easy to stick to the knife and is also difficult to cut. However, the hardness of titanium alloy is only one aspect of the difficulty in cutting. The key lies in the comprehensive influence of the chemical, physical, and mechanical properties of titanium alloy itself on its cutting processability. The original mobile phone frame has a low yield rate and is difficult to process by cutting or rolling. Summary of the invention

[0005] The invention provides a U-shaped mobile phone frame rolling method, which is used to solve the problems of low yield and great processing difficulty in the prior art.

[0006] The present invention provides 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, and 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 the 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 face and the lower face of the U-shaped mobile phone frame correspond to the upper surface and the lower surface of the mobile phone, and the rolling method comprises:

[0007] The alloy blank is rolled by a profiling roller group of the rolling equipment to obtain a U-shaped mobile phone frame semi-finished product, wherein the profiling roller group includes a first roller with convex ridges on the outer circumference and a second roller with grooves on the outer circumference;

[0008] 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] According to a method for rolling a U-shaped mobile phone frame provided by an embodiment of the present invention, before the step of rolling the alloy blank by the profiling roller group of the rolling equipment, the method further comprises:

[0010] The alloy billet is preheated to a predetermined temperature.

[0011] According to a U-shaped mobile phone frame rolling method provided by an embodiment of the present invention, 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:

[0012] The U-shaped mobile phone frame semi-finished product is subjected to annealing treatment.

[0013] According to a U-shaped mobile phone frame rolling method provided by an embodiment of the present invention, 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.

[0014] According to a U-shaped mobile phone frame rolling method provided in an embodiment of the present invention, while performing the step of annealing the U-shaped mobile phone frame semi-finished product, the method further comprises:

[0015] A heat stretching force is applied to both ends of the U-shaped mobile phone frame semi-finished product, and the heat stretching force is greater than or equal to 10N.

[0016] According to a U-shaped mobile phone frame rolling method provided by an embodiment of the present invention, while executing the step of rolling the alloy blank by the profiling roller group of the rolling equipment, it also includes:

[0017] The alloy blank is lubricated with emulsion or cooling water.

[0018] According to a method for rolling a U-shaped mobile phone frame provided by an embodiment of the present invention, the rolling equipment includes a first profiling roller group, a second profiling roller group, a third profiling roller group and a fourth profiling roller group which are arranged in sequence, wherein the convex ridges of the second profiling roller group, the third profiling roller group and the fourth profiling roller group are all provided with convex portions.

[0019] According to a U-shaped mobile phone frame rolling method provided by an embodiment of the present invention, the steps of rolling the alloy billet by a contoured roller group of the rolling equipment include:

[0020] The alloy blank is rolled by the first profiling roller group to obtain a semi-finished frame with a U-shaped cross section;

[0021] The semi-finished product frame is rolled by the second profiling roller group, so that the U-shaped groove of the semi-finished product frame is deepened and a profiling concave surface is formed in the U-shaped groove;

[0022] The semi-finished product frame is rolled by the third profiling roller group, so that the U-shaped groove and the profiling concave surface of the semi-finished product frame are deepened;

[0023] The semi-finished product frame is rolled by the fourth profiling roller group, so that the U-shaped groove and the profiling concave surface of the semi-finished product frame are deepened to obtain the U-shaped mobile phone frame semi-finished product.

[0024] According to a U-shaped mobile phone frame rolling method provided by an embodiment of the present invention, the profiling roller group further includes:

[0025] Two side rollers, one of which is arranged on the same side of the first roller and the second roller, and abuts against one side of the first roller and one side of the second roller; the other side roller is arranged on the other side of the first roller and the second roller, and abuts against the other side of the first roller and the other side of the second roller.

[0026] The present invention also provides a mobile phone frame assembly, which is rolled based on any one of the above-mentioned U-shaped mobile phone frame rolling methods.

[0027] 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 cuts it after annealing and straightening, and finally obtains the U-shaped mobile phone frame through CNC processing and shaping. The deformation after CNC processing is small, the shaping difficulty is low, 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%. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the rolling principle of the existing mobile phone frame provided by an embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of an existing mobile phone frame provided by an embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the rolling principle of a U-shaped mobile phone frame provided by an embodiment of the present invention;

[0032] Figure 4 It is a structural schematic diagram of a U-shaped mobile phone frame provided by an embodiment of the present invention;

[0033] Figure 5 is a schematic structural diagram of a preheating furnace provided in an embodiment of the present invention;

[0034] Figure 6 is a schematic structural diagram of a contoured roller assembly provided in an embodiment of the present invention;

[0035] Figure 7 This is one of the flow diagrams of the method for rolling a U-shaped mobile phone frame provided in an embodiment of the present invention;

[0036] Figure 8 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;

[0037] Fig. 9 is one of the relationship diagrams between rolling temperature and deformation rate provided in an embodiment of the present invention;

[0038] Fig.10 This is the second relationship diagram between rolling temperature and deformation rate provided in an embodiment of the present invention;

[0039] Fig.11 This is the second relationship diagram between rolling temperature and deformation rate provided in an embodiment of the present invention.

[0040] Reference numerals:

[0041] 1. Air inlet; 2. Feed inlet; 3. Plug; 4. Preheating furnace; 5. Titanium alloy billet; 6. Exhaust hole; 7. First rolling roller; 8. Protrusion; 9. Second rolling roller; 10. Groove; 11. Side rolling roller; 12. Protrusion; 13. Existing mobile phone frame; 14. U-shaped mobile phone frame; 15. U-shaped mobile phone frame semi-finished product; 16. Discharge port. DETAILED DESCRIPTION

[0042] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0044] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0045] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0047] like Figure 7As 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 14 includes two side portions and a frame body portion located between the two side portions; when the U-shaped mobile phone frame 14 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 portion and the lower portion of the U-shaped mobile phone frame 14 correspond to the upper surface and the lower surface of the mobile phone, and the rolling method includes:

[0048] Step 100, rolling the alloy blank by a profiling roller group of a rolling equipment to obtain a U-shaped mobile phone frame semi-finished product 15, wherein the profiling roller group includes a first roller with convex ridges 12 on the outer circumference and a second roller with grooves 10 on the outer circumference;

[0049] Step 200, cut the U-shaped mobile phone frame semi-finished product 15 into a U-shaped mobile phone frame 14 of a predetermined size, wherein the cutting direction is parallel to the upper and lower parts of the U-shaped mobile phone frame 14 to form the upper and lower parts of the U-shaped mobile phone frame 14, and the cutting amount is equal to the thickness of the U-shaped mobile phone frame 14.

[0050] 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 15, and then cuts it after annealing and straightening, and finally obtains the U-shaped mobile phone frame 14 through CNC processing and shaping. The deformation after CNC processing is small, the shaping difficulty is low, 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%.

[0051] In one embodiment of the present invention, before the step of rolling the alloy blank by the profiling roller group of the rolling equipment, the U-shaped mobile phone frame rolling method further includes:

[0052] The alloy billet is preheated to a predetermined temperature.

[0053] The alloy blank in the present invention is a titanium alloy blank, and of course, it can also be other alloy blanks. The cross section of the titanium alloy blank 5 is preferably rectangular.

[0054] like Figure 5 As shown, before rolling, the titanium alloy blank 5 is continuously heated in the preheating furnace 4, thereby increasing the temperature of the titanium alloy blank 5, reducing the hardness of the titanium alloy blank 5, and making the titanium alloy blank 5 hardened uniformly, which is convenient for rolling. The predetermined temperature is 700-1050°C, preferably, the predetermined temperature is 900°C.

[0055] The preheating process is carried out in a preheating furnace 4, a feed port 2 is arranged at one end of the preheating furnace 4, and a discharge port 16 is arranged at the other end. Gas is introduced into the furnace tube of the preheating furnace 4 as a medium for heat transfer. After feeding, the feed port 2 and the discharge port 16 are both closed by a plug 3. An air inlet 1 is also arranged at one end of the preheating furnace 4, through which a protective gas can be injected (in a closed state without considering the protective gas), and an exhaust hole 6 is arranged at the other end of the preheating furnace 4 to ensure that the hot air expanded during the heating process can be discharged safely without burning people.

[0056] The furnace temperature of the preheating furnace 4 is 900° C., the online speed of the titanium alloy billet 5 is 5±0.1 m / min, the furnace time is 10 min, the furnace tube is filled with argon, the total flow rate of the filling is 60-100 NL / min, and the oxygen content is less than 0.5%.

[0057] 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.

[0058] Rolling speed is an important factor affecting deformation speed and an important parameter to be controlled during rolling. It affects the changes in stress and strain field of the blank. Under different rolling speeds, the deformation from the surface to the core of the slab gradually decreases. The strain value of the surface is the largest, indicating that the deformation degree of the surface is greater than that of other parts such as the edge and the core. However, the strain change trend from the surface to the core under different rolling speeds is still gradually decreasing. The faster the rolling speed, the greater the strain difference from the surface to the core. This is because some parts deform preferentially toward favorable grains, and only when the deformation accumulates to a certain extent will it drive the grains in other parts to deform. The faster the rolling speed, the grains that deform first inside the slab have no time to transfer the deformation, thus causing the deformation to be uneven. The faster the deformation speed, the greater the unevenness. For the rolling of the semi-finished mobile phone frame, in order to make the stress value smaller and the grains more uniform, after many tests, the rolling speed is selected within the range of 4 to 7 m / min, the slab stress value is smaller, and the production efficiency is higher.

[0059] like Figures 9 to 11 As shown in the figure, when the rolled product is in the gray area, the defective rate increases significantly. By controlling the temperature and rolling speed, the titanium alloy can be formed in an area away from the gray area, which can improve the product qualification rate.

[0060] 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 14 of a predetermined size, the U-shaped mobile phone frame rolling method further includes:

[0061] The U-shaped mobile phone frame semi-finished product 15 is subjected to annealing treatment.

[0062] 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.

[0063] 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.

[0064] Combine the following Figure 8 A specific embodiment of the present invention is described in detail as follows. Figure 8 As shown, the rolling method includes:

[0065] Step 100, preheating the alloy blank to a predetermined temperature;

[0066] Step 200, rolling the alloy blank by a profiling roller group of a rolling equipment to obtain a U-shaped mobile phone frame semi-finished product 15, wherein the profiling roller group includes a first roller with convex ridges 12 on the outer circumference and a second roller with grooves 10 on the outer circumference;

[0067] Step 300, annealing the U-shaped mobile phone frame semi-finished product 15;

[0068] Step 400, cut the U-shaped mobile phone frame semi-finished product 15 into a U-shaped mobile phone frame 14 of a predetermined size, wherein the cutting direction is parallel to the upper and lower parts of the U-shaped mobile phone frame 14 to form the upper and lower parts of the U-shaped mobile phone frame 14, and the cutting amount is equal to the thickness of the U-shaped mobile phone frame 14.

[0069] In one embodiment of the present invention, while performing the step of annealing the U-shaped mobile phone frame semi-finished product 15, the U-shaped mobile phone frame rolling method further includes:

[0070] A heat stretching force is applied to both ends of the U-shaped mobile phone frame semi-finished product 15, and the heat stretching force is greater than or equal to 10N.

[0071] The two ends of the rolled U-shaped mobile phone frame semi-finished product 15 are tensioned at both ends of the annealing furnace through the front and rear tension devices, forming a tension added to the material (the tension needs to be precisely controlled), so that the inconsistent material structure length becomes 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.

[0072] 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:

[0073] Use emulsion or cooling water to lubricate the alloy billet.

[0074] Lubricating the alloy billet with emulsion or cooling water can improve the rolling accuracy and shape.

[0075] In one embodiment of the present invention, the rolling equipment includes a first profiling roller group, a second profiling roller group, a third profiling roller group and a fourth profiling roller group arranged in sequence, wherein the convex ridges 12 of the second profiling roller group, the third profiling roller group and the fourth profiling roller group are all provided with protrusions 8.

[0076] The number of the contouring roller groups is not limited to four, and may also be five, six or more.

[0077] like Figure 6 As shown, each contoured roller group includes a first roller 7 and a second roller 9, the first roller 7 has a ring-shaped convex ridge 12, and the second roller 9 has a ring-shaped groove 10. The titanium alloy blank 5 is profiled and shaped by the first roller 7 and the second roller 9 to form a U-shaped mobile phone frame semi-finished product 15.

[0078] Preferably, the convex portion 8 is a step that is arranged on the convex rib 12 in a continuous stepped and protruding shape. The height of the convex rib 12 and the step increases continuously. The increased size is obtained by converting the reduction rate of each pass. The reduction rate of each pass is allocated according to the total reduction rate. Generally, the reduction rate of each pass does not exceed 20%. In order to control the size of the finished product, the reduction rate of each pass is generally allocated from large to small according to the total reduction rate.

[0079] In one embodiment of the present invention, Figure 3 and Figure 4 As shown, the steps of rolling the alloy billet by the contoured roll group of the rolling equipment include:

[0080] The alloy blank is rolled by a first contouring roller group to obtain a semi-finished frame with a U-shaped cross section;

[0081] The semi-finished product frame is rolled by the second profiling roller group, so that the U-shaped groove of the semi-finished product frame is deepened and a profiling concave surface is formed in the U-shaped groove;

[0082] The semi-finished product frame is rolled by the third profiling roller group, so that the U-shaped groove and the profiling concave surface of the semi-finished product frame are deepened;

[0083] The semi-finished product frame is rolled by the fourth profiling roller group, so that the U-shaped groove and the profiling concave surface of the semi-finished product frame are deepened to obtain a U-shaped mobile phone frame semi-finished product 15.

[0084] By adopting multiple continuous rolling processes, the wire is gradually formed into the final cross-sectional size, thus avoiding the uneven cracking and deformation during the rolling process and reducing the residual stress of the titanium alloy.

[0085] like Figure 3 As shown, the overall thickness H of the U-shaped mobile phone frame semi-finished product 15 after the first rolling is 12 mm, the overall thickness H of the U-shaped mobile phone frame semi-finished product 15 after the second rolling is 10 mm, the overall thickness H of the U-shaped mobile phone frame semi-finished product 15 after the third rolling is 8.5 mm, and the overall thickness H of the U-shaped mobile phone frame semi-finished product 15 after the fourth rolling is 7.5 mm.

[0086] like Figure 4 The preheated titanium alloy blank 5 is rolled four times continuously by four groups of contoured rollers to form a U-shaped mobile phone frame semi-finished product 15, the U-shaped cross-section and the rolled cross-section of the existing mobile phone frame 13 are mutually perpendicular cross-sections, the existing mobile phone frame 13 needs to be bent to form a U-shaped structure, and 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 13 can be formed through bending, while 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 14, which reduces the process steps and improves the production efficiency.

[0087] In one embodiment of the present invention, the contoured roller group also includes two side rollers 11, one of which is arranged on the same side of the first roller 7 and the second roller 9, and abuts against one side of the first roller 7 and one side of the second roller 9; the other side roller 11 is arranged on the other side of the first roller 7 and the second roller 9, and abuts against the other side of the first roller 7 and the other side of the second roller 9.

[0088] By arranging two side rollers 11 on both sides of the first roller 7 and the second roller 9, the lateral displacement of a pair of contour rollers can be prevented, and the accuracy of both sides of the U-shaped mobile phone frame assembly semi-finished product can be ensured.

[0089] Combine the following Figures 3 to 6 A specific embodiment of the present invention is described as follows. Figures 3 to 6 As shown, in this embodiment, the titanium alloy blank 5 is preheated before each rolling to increase the temperature of the semi-finished titanium alloy mobile phone frame assembly, so that the hardness of the semi-finished titanium alloy mobile phone frame assembly is reduced, which is convenient for rolling and can achieve uniform speed rolling;

[0090] Before the first rolling, the titanium alloy billet 5 is continuously heated in the preheating furnace 4 to increase the temperature of the titanium alloy billet 5 and reduce the hardness of the titanium alloy billet 5, thereby facilitating rolling.

[0091] like Figure 4 As shown, a feed port 2 is provided at one end of the preheating furnace 4, and a discharge port 16 is provided at the other end. Gas is introduced into the furnace tube of the preheating furnace 4 as a medium for heat transfer. After feeding, the feed port 2 and the discharge port 16 are both closed by a plug 3. An air inlet 1 is also provided at one end of the preheating furnace 4, through which a protective gas can be injected (in a closed state without considering the protective gas), and an exhaust hole 6 is provided at the other end of the preheating furnace 4 to ensure that the hot air expanded during the heating process can be discharged safely without burning people.

[0092] The furnace temperature of the preheating furnace 4 is 940° C., the online speed of the titanium alloy billet 5 is 5±0.1 m / min, the furnace time is 10 min, the furnace tube is filled with argon gas, the total gas flow rate is 60-100 NL / min, and the oxygen content is less than 0.5%.

[0093] like Figure 5 As shown, the preheated titanium alloy blank 5 is rolled for the first time by a first profiling roller group. The profiling rollers include a first roller 7 and a second roller 9. The first roller 7 has a ring-shaped convex ridge 12, and the second roller 9 has a ring-shaped groove 10. The titanium alloy blank 5 is subjected to special-shaped rolling by the first roller 7 and the second roller 9 to form a U-shaped mobile phone frame semi-finished product 15.

[0094] Furthermore, during the first rolling, a pair of side rollers 11 are symmetrically arranged on both sides of the first roller 7 and the second roller 9. During rolling, the pair of side rollers 11 are respectively pressed against both sides of the first roller 7 and the second roller 9 to prevent lateral displacement of a contoured roller group, thereby ensuring the accuracy of the U-shaped mobile phone frame semi-finished product 15.

[0095] After the first rolling, the U-shaped mobile phone frame semi-finished product 15 needs to be preheated for the second time. It is continuously heated in the preheating furnace 4 to increase the temperature of the titanium alloy mobile phone frame semi-finished product and reduce the hardness of the titanium alloy mobile phone frame semi-finished product for easy rolling.

[0096] The furnace temperature of the preheating furnace 4 is 960°C, the online speed of the titanium alloy billet 5 is 1±0.1m / min, the furnace time is 10min, the furnace tube is filled with argon, the total flow rate of the filling is 60-100NL / min, and the oxygen content is less than 0.5%.

[0097] After the second preheating, the titanium alloy blank 5 is rolled for the second time by the second profiling roller group. The second profiling roller group includes a first roller 7 and a second roller 9. The first roller 7 has a ring-shaped convex ridge 12, and the second roller 9 has a ring-shaped groove 10. The convex ridge 12 of the first roller 7 is provided with an uneven profiling surface. The U-shaped structure of the titanium alloy blank 5 is further shaped by the first roller 7 and the second roller 9 to form a profiling concave structure of the U-shaped mobile phone frame.

[0098] Furthermore, during the second rolling, a pair of side rollers 11 are symmetrically arranged on both sides of the first roller 7 and the second roller 9. During rolling, the pair of side rollers 11 are respectively pressed against both sides of the first roller 7 and the second roller 9 to prevent lateral displacement of the second contoured roller group, thereby ensuring the accuracy of the U-shaped mobile phone frame semi-finished product 15.

[0099] After the second rolling, the U-shaped mobile phone frame semi-finished product 15 needs to be preheated for the second time. It is continuously heated in the preheating furnace 4 to increase the temperature of the titanium alloy mobile phone frame semi-finished product and reduce the hardness of the titanium alloy mobile phone frame semi-finished product for easy rolling.

[0100] The furnace temperature of the preheating furnace 4 is 960°C, the titanium alloy billet 5 has an online speed of 5±0.1 m / min, a furnace time of 10 min, argon is filled in the furnace tube, the total flow rate of the filling is 60-100 NL / min, and the oxygen content is less than 0.5%;

[0101] After the third preheating, the titanium alloy blank 5 is rolled for the third time by the third profiling roller group. The third profiling roller group includes a first roller 7 and a second roller 9. The first roller 7 has a ring-shaped convex ridge 12, and the second roller 9 has a ring-shaped groove 10. The convex ridge 12 of the first roller 7 is provided with an uneven profiling surface. The U-shaped structure of the titanium alloy blank 5 is further shaped by the first roller 7 and the second roller 9, and at the same time, the profiling concave structure of the mobile phone frame is deepened.

[0102] Furthermore, during the third rolling, a pair of side rollers 11 are symmetrically arranged on both sides of the first roller 7 and the second roller 9. During rolling, the pair of side rollers 11 are respectively pressed against both sides of the first roller 7 and the second roller 9 to prevent lateral displacement of the third contour roller group, thereby ensuring the accuracy of the U-shaped mobile phone frame semi-finished product 15.

[0103] After the third rolling, the U-shaped mobile phone frame semi-finished product 15 needs to be preheated for the fourth time. It is continuously heated in the preheating furnace 4 to increase the temperature of the U-shaped mobile phone frame semi-finished product 15 and reduce the hardness of the U-shaped mobile phone frame semi-finished product 15 to facilitate rolling.

[0104] The furnace temperature of the preheating furnace 4 is 990° C., the online speed of the titanium alloy billet 5 is 5±0.1 m / min, the furnace time is 10 min, the furnace tube is filled with argon gas, the total gas flow rate is 60-100 NL / min, and the oxygen content is less than 0.5%.

[0105] After the fourth preheating, the titanium alloy blank 5 is rolled for the third time by the fourth profiling roller group. The fourth profiling roller group includes a first roller 7 and a second roller 9. The first roller 7 has a ring-shaped convex ridge 12, and the second roller 9 has a ring-shaped groove 10. The convex ridge 12 of the first roller 7 is provided with an uneven profiling surface. The U-shaped structure of the titanium alloy blank 5 is further shaped by the first roller 7 and the second roller 9, and at the same time, the profiling concave structure of the semi-finished mobile phone frame assembly is deepened, finally forming a U-shaped mobile phone frame semi-finished product 15.

[0106] Furthermore, during the fourth rolling, a pair of side rollers 11 are symmetrically arranged on both sides of the first roller 7 and the second roller 9. During rolling, the pair of side rollers 11 are respectively pressed against both sides of the first roller 7 and the second roller 9 to prevent lateral displacement of the fourth contoured roller group, thereby ensuring the accuracy of the U-shaped mobile phone frame semi-finished product 15.

[0107] After rolling, the U-shaped mobile phone frame semi-finished product 15 is annealed in an annealing furnace at a temperature of 770±60° C. for more than 10 minutes in the furnace to avoid uneven cracking and deformation during the rolling process and reduce the residual stress of the titanium alloy.

[0108] During annealing, a hot stretching force of more than 10N is applied to both ends of the formed U-shaped mobile phone frame semi-finished product 15, and attached to the material through front and rear tension devices to make 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.

[0109] 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 cooling water onto the rollers or by immersing the rollers in a tank filled with the emulsion or cooling water. The concentration of the emulsion used is between 6-20%, the service life of the rollers can be increased by 2-3 times, and the smoothness of the material surface can be increased by 10-30%. The target U-shape is directly obtained by multi-pass U-shaped special-shaped rolling, and the finished U-shape is obtained by sawing after annealing and straightening. The U-shaped mobile phone frame 14 can be obtained by subsequent CNC processing and shaping. The deformation after CNC processing is small, the shaping difficulty is low, 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%.

[0110] 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.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments 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 is rolled by a profiling roller group of the rolling equipment to obtain a U-shaped mobile phone frame semi-finished product, wherein the profiling roller group includes a first roller with convex ridges on the outer circumference and a second roller with grooves on the outer circumference; 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 rolling the alloy billet by the contoured roll group of the rolling equipment, the process further comprises: The alloy billet is preheated to a predetermined temperature.

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 3 or 4, characterized in that: While performing the step of annealing the semi-finished U-shaped mobile phone frame, the method further includes: A heat stretching force is applied to both ends of the U-shaped mobile phone frame semi-finished product, and the heat stretching force is greater than or equal to 10N.

6. The method for rolling a U-shaped mobile phone frame according to any one of claims 1 to 4, characterized in that: While executing the step of rolling the alloy billet by the contoured roll group of the rolling equipment, the process also includes: The alloy blank is lubricated with emulsion or cooling water.

7. The method for rolling a U-shaped mobile phone frame according to any one of claims 1 to 4, characterized in that: The rolling equipment comprises a first profiling roller group, a second profiling roller group, a third profiling roller group and a fourth profiling roller group which are arranged in sequence, wherein the convex ridges of the second profiling roller group, the third profiling roller group and the fourth profiling roller group are all provided with convex parts.

8. The method for rolling a U-shaped mobile phone frame according to claim 7, characterized in that: The step of rolling the alloy billet by the contoured roller group of the rolling equipment comprises: The alloy blank is rolled by the first profiling roller group to obtain a semi-finished frame with a U-shaped cross section; The semi-finished product frame is rolled by the second profiling roller group, so that the U-shaped groove of the semi-finished product frame is deepened and a profiling concave surface is formed in the U-shaped groove; The semi-finished product frame is rolled by the third profiling roller group, so that the U-shaped groove and the profiling concave surface of the semi-finished product frame are deepened; The semi-finished product frame is rolled by the fourth profiling roller group, so that the U-shaped groove and the profiling concave surface of the semi-finished product frame are deepened to obtain the U-shaped mobile phone frame semi-finished product.

9. The method for rolling a U-shaped mobile phone frame according to any one of claims 1 to 4, characterized in that: The profiling roller group also includes: Two side rollers, one of which is arranged on the same side of the first roller and the second roller, and abuts against one side of the first roller and one side of the second roller; the other side roller is arranged on the other side of the first roller and the second roller, and abuts against the other side of the first roller and the other side of the second roller.

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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