CN105643214B - The processing method of the rear case component of mobile terminal - Google Patents

Abstract

The invention discloses a method for processing a back cover assembly of a mobile terminal. The back cover assembly includes a middle cover, an upper cover and a lower cover which are independently processed, and the upper cover and the lower cover are connected to the middle cover respectively. On the upper and lower sides, the back cover assembly is a metal part. The back cover assembly includes the following processing steps: stamping the metal strip along the set direction to obtain the middle cover, and the cut surface formed by the stamped metal strip constitutes the left side of the middle cover. On the side or right side, the left and right sides of the middle cover are respectively adapted to be connected to the left and right side walls of the housing of the mobile terminal, and the size of the metal strip in the set direction is roughly equal to the size of the middle cover in the up and down direction; Assemble the middle cover, upper cover and lower cover into a rear cover assembly. According to the processing method of the present invention, the processing cost is saved and the processing efficiency is improved. The rounded corners of the process are hidden in places that are not easy to see clearly, so that the visual gap on the back of the product is small and the product fineness is good.

Description

Processing method of back cover assembly of mobile terminal

technical field

The invention relates to the field of processing and manufacturing of electronic products, in particular to a processing method for a rear cover assembly of a mobile terminal.

Background technique

In order to meet the needs of consumers and improve product grades, electronic product manufacturers usually use metal materials for the appearance of products, and the large-area metal back cover on the product is one of them.

The metal back cover disclosed in the related art is generally processed by CNC, and the cost of CNC processing is relatively high. There are also some metal back covers that are processed by stamping. During the stamping process, the back cover will produce rounded corners. If the rounded corners are not processed properly, the fineness of the product appearance will be affected.

Contents of the invention

This application aims to solve at least one of the technical problems existing in the prior art. Therefore, the present invention aims to provide a method for processing a back cover assembly of a mobile terminal, and the back cover manufactured according to the method is more beautiful.

According to the processing method of the back cover assembly of the mobile terminal according to the embodiment of the present invention, the back cover assembly includes a middle cover plate, an upper cover plate and a lower cover plate processed independently, and the upper cover plate and the lower cover plate are respectively Connected to the upper and lower sides of the middle cover, the back cover assembly is a metal part, and the back cover assembly includes the following processing steps: stamping the metal strip along a set direction to obtain the middle cover, so The cut surface formed by stamping the metal strip constitutes the left side or the right side of the middle cover, and the left side of the middle cover is suitable for connecting with the left side wall of the housing of the mobile terminal. The right side of the middle cover is suitable for connecting to the right side wall of the housing of the mobile terminal, and the size of the metal strip in the setting direction is roughly equal to the size of the middle cover in the up and down direction; respectively Processing the upper cover and the lower cover; assembling the middle cover, the upper cover and the lower cover into the rear cover assembly.

According to the processing method of the rear cover assembly of the mobile terminal in the embodiment of the present invention, the middle cover plate is processed by a stamping process, which saves the processing cost and improves the processing efficiency. In addition, the stamping process makes the opposite side of the middle cover plate have a process fillet. In the processing method of the embodiment of the present invention, by setting the side edge with the process fillet of the middle cover plate at the side wall of the shell , that is, to hide the rounded corners of the process in a position that is not easy to see clearly, so that the visual gap on the back of the product is small and the product fineness is good.

Specifically, the processing of the middle cover plate includes the following steps: S1: Pre-punching the metal strip along the set direction to obtain the blank of the middle cover plate, and the blank of the middle cover plate is on the left side and /or pre-punching and cutting out the positioning plate on the right side; S2: pretreat the blank of the middle cover plate to obtain the semi-finished product of the middle cover plate; S3: stamp the semi-finished product of the middle cover plate to remove the positioning plate to obtain Get the middle cover. As a result, the positioning plate is punched out during pre-stamping, so that the blank of the middle cover plate can be stood or hung by the positioning plate during pretreatment. Afterwards, pretreatment is carried out to ensure the pretreatment quality of the middle cover plate.

Optionally, in the pretreatment of step S2, oxidation treatment is performed on the blank of the middle cover plate. In this way, the defects in the hardness and wear resistance of the metal surface can be solved, the service life of the metal can be prolonged and the aesthetics can be enhanced.

Optionally, 1-3 positioning plates are provided on the left side of the blank of the middle cover plate.

Optionally, 1-3 positioning plates are arranged on the right side of the blank of the middle cover plate.

In some examples, the positioning plate is formed in a sheet shape, and the positioning plate is provided with a hanging hole penetrating in a thickness direction. The sheet-shaped hanging lug has a simple structure, the structure of the stamping tool does not need to be too complicated, and the processing cost is low.

In some embodiments, the left side and the right side of the middle cover are respectively bent forward. Thus, the middle cover forms small-angle arcs at the left side and the right side, making the appearance of the product round and beautiful. Moreover, the left side and the right side of the middle cover can be better fastened to the left side wall and the right side wall of the casing, so that the product casing is more closely connected.

Specifically, in step S1, the metal strip is pre-punched from the back to the front so that the left side and the right side of the blank of the middle cover plate are respectively bent forward. Before the pretreatment, the radians are stamped on the left and right sides, which can ensure the processing quality of the pretreatment of the middle cover plate.

Specifically, in step S1, the positioning plates are respectively processed on the left side and the right side of the blank of the middle cover plate, and the left side and the right side of the blank of the middle cover plate are The positioning plates on the top are respectively bent towards each other. Thus, the positioning surface of the positioning plate is spaced a certain distance from the main body of the blank of the middle cover plate, which facilitates the pretreatment of the surface of the blank of the middle cover plate.

Advantageously, in step S1, there is an angle between the positioning plate and the blank of the middle cover plate, and the extension direction of the positioning plate is in line with the left or right side of the middle cover plate. Tangent to the bend direction. Thus, it is possible to avoid damage to the positioning plate due to excessive force during punching.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

FIG. 1 is a schematic diagram of a rear view structure of a mobile terminal housing according to an embodiment of the present invention;

Fig. 2 is a right view structural diagram of a mobile terminal housing according to an embodiment of the present invention;

FIG. 3 is an exploded schematic diagram of a mobile terminal housing according to an embodiment of the present invention;

Fig. 4 is a rear view structural schematic diagram of the middle cover plate (the left and right sides of the middle cover plate are formed by the cut surface of the metal strip) according to the embodiment of the present invention;

Fig. 5 is a sectional view along the Y-Y direction in Fig. 4;

Fig. 6 is a sectional view along X-X direction in Fig. 4;

Figure 7 is an enlarged view of part A circled in Figure 5;

Figure 8 is an enlarged view of part B circled in Figure 6;

Fig. 9 is a rear view structural schematic diagram of the middle cover (the cut surface of the metal strip forms the upper and lower sides of the middle cover);

Fig. 10 is a sectional view along the Q-Q direction in Fig. 9;

Fig. 11 is a sectional view along the P-P direction in Fig. 9;

Fig. 12 is an enlarged view of part K circled in Fig. 10;

Fig. 13 is an enlarged view of part R circled in Fig. 11;

Fig. 14 is a schematic diagram of the rear view effect of the mobile terminal housing when the middle cover shown in Fig. 9 is used;

Fig. 15 is a flow chart of the processing steps of the middle cover plate according to the embodiment of the present invention;

Fig. 16 is a schematic diagram of the process change of the middle cover plate according to the embodiment of the present invention;

Fig. 17 is a cross-sectional view along the Z-Z direction of the blank of the middle cover plate in Fig. 16;

Fig. 18 is a cross-sectional view of the blank of the middle cover plate along the G-G direction in Fig. 16;

Figure 19 is an enlarged view of part C circled in Figure 17;

Fig. 20 is an enlarged view of part D circled in Fig. 18 .

Reference signs:

The middle cover plate (the cut surface of the metal strip forms the left and right sides of the middle cover plate) and the corresponding part numbers of the shell:

Housing 100, top wall 101, bottom wall 102, left side wall 103, right side wall 104,

Back cover assembly 1, middle cover plate 11, upper cover plate 12, lower cover plate 13, process fillet 111, upper seam m1, lower seam m2, arc 112,

The upper side s1 of the middle cover, the lower side s2 of the middle cover, the left side s3 of the middle cover, the right side s4 of the middle cover,

Middle frame 2,

Metal material belt 200, intermediate cover plate blank 201, positioning plate 202, hanging hole 2021, intermediate cover plate semi-finished product 203;

The middle cover plate (the cut surface of the metal strip forms the upper and lower sides of the middle cover plate) and the corresponding part numbers of the shell:

Housing 100', rear cover assembly 1', middle cover 11', upper side s1' of the middle cover, lower side s2' of the middle cover, left side s3' of the middle cover, right side of the middle cover Side s4', process fillet 111',

Upper cover 12', lower cover 13', upper seam m1', lower seam m2'.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

The following describes a method for processing a rear cover assembly of a mobile terminal according to an embodiment of the present invention with reference to FIGS. 1-20 . Here, the mobile terminal can be a mobile phone, a handheld computer, an MP3 player, etc., and the back cover assembly 1 of the mobile terminal is the back cover of products such as a mobile phone, a handheld computer, and an MP3 player. The specific type of the mobile terminal is not limited herein.

As shown in FIGS. 1-3 , the rear cover assembly 1 constitutes the rear wall of the mobile terminal housing 100, and the rear cover assembly 1 is connected to the top wall 101, the bottom wall 102, the left side wall 103 and the right side wall 104 of the housing 100 respectively. connected. In the example of FIG. 3 , the casing 100 further includes a middle frame 2, which is a square frame, and the rear cover assembly 1 is also substantially square. The rear cover assembly 1 is connected to the rear side of the middle frame 2, and the four sides of the middle frame 2 The two frames respectively constitute the top wall 101, the bottom wall 102, the left side wall 103 and the right side wall 104 of the housing 100, and the housing 100 formed is approximately a cuboid. Of course, in the embodiment of the present invention, the shape of the rear cover assembly 1 is not limited to a square shape, for example, the housing 100 may be cylindrical, and the rear cover assembly 1 is formed in a circular shape.

In the embodiment of the present invention, as shown in FIGS. 1-3 , the rear cover assembly 1 includes a middle cover plate 11, an upper cover plate 12 and a lower cover plate 13 which are independently processed, and the upper cover plate 12 and the lower cover plate 13 are respectively Connected to the upper and lower sides of the middle cover plate 11, the rear cover assembly 1 is a metal part. The left side s3 of the middle cover 11 is suitable for connecting with the left side wall 103 of the housing 100 , and the right side s4 of the middle cover 11 is suitable for connecting with the right side wall 104 of the housing 100 .

For the convenience of understanding, as shown in FIG. 3 , in the plane where the middle cover 11 is located, the direction of the longer dimension of the middle cover 11 is referred to as the up and down direction of the middle cover 11, and the direction of the middle cover 11 in the shorter dimension The direction is referred to as the left-right direction of the middle cover 11 , and the directions of the casing 100 and other components are also named with reference to the direction of the middle cover 11 . For example, the cover above the middle cover 11 is the upper cover 12 , and the cover below the middle cover 11 is the lower cover 13 .

However, it should be noted that the orientations or positional relationships indicated by "up", "down", "front", "back", "left", and "right" mentioned in this article are all based on the directions shown in the accompanying drawings. Orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. For example, in Figure 1, if the product is placed after being rotated by 90 degrees, the direction of the longer dimension of the middle cover 11 can be called the left and right direction of the middle cover 11, and the direction of the shorter dimension of the middle cover 11 can be called The up and down direction of the middle cover plate 11. That is to say, the direction limitation in this article is not a specific limitation on the product structure direction. In order to simplify the description, the description below still refers to the orientation shown in the figure.

It is understandable that the back cover of some mobile terminal products needs to process holes, grooves, decorative arcs, etc. at the upper and lower ends, and the processing is more complicated, while the part in the center of the back cover is often a large flat structure. Therefore, the manufacturer will divide the back cover into three parts: the middle cover 11, the upper cover 12 and the lower cover 13, and the upper cover 12 or the lower cover 13 with structures such as holes, grooves, and decorative arcs are concentrated. After being reduced, the processing is easy, and the processing steps of the middle cover plate 11 with a large plane structure are reduced, and the processing cycle can also be shortened. In some mobile terminal products, due to the detachable design of the battery cover or other considerations, the rear cover is divided into a middle cover 11, a non-detachable upper cover 12, and a lower cover 13. The middle cover 11 is equivalent to a detachable Removed battery cover.

After the middle cover 11, the upper cover 12 and the lower cover 13 are assembled, the joints between the middle cover 11, the upper cover 12, and the lower cover 13 will form seams, and the seams are more eye-catching on the back of the mobile terminal. If the seams can be thinned and weakened, the integrated appearance effect of the metal rear cover assembly 1 at the seams can be realized. Selecting an appropriate processing method for the back cover assembly is one of the means to achieve the thinning and weakening of the back cover seam.

In the related art, methods such as CNC processing and stamping processing have been disclosed for the processing method of the back cover. CNC processing is used, although the processing is fine, but the cost is high and the processing cycle is long. Obviously, the CNC method is too wasteful to process the middle cover. However, stamping processing is fast and efficient. For the middle cover plate with a simple structure, stamping processing is more complementary.

If the stamping process is to be used to take advantage of the fast stamping process, then how to maximize the strengths and avoid weaknesses of the stamping process is the key to realizing the thinning and weakening of the seam of the back cover in this paper.

The processing method of the back cover assembly of the mobile terminal according to the embodiment of the present invention includes the following processing steps:

Respectively process the upper cover plate 12 and the lower cover plate 13, here, the processing methods of the upper cover plate 12 and the lower cover plate 13 are not specifically limited;

The metal material strip 200 is stamped along the set direction to obtain the middle cover plate 11, the cut surface formed after the metal material strip 200 is stamped constitutes the left side s3 or the right side s4 of the middle cover plate 11, the metal material strip 200 is set The size in the fixed direction is roughly equal to the size of the middle cover plate 11 in the up and down direction;

The rear cover assembly 1 is assembled by assembling the middle cover 11 , the upper cover 12 and the lower cover 13 .

For convenience of description here, the set direction of the metal strip 200 may also be called the width direction of the metal strip 200 , and the direction perpendicular to the set direction is called the length direction of the metal strip 200 . In industrial processing, the size of the metal material strip 200 in the length direction is larger than the size in the width direction, and the metal material strip 200 can be punched out into a plurality of middle cover plates 11 along the length direction. However, it is not excluded that after the metal strip 200 is cut into sections, the size of the metal strip 200 in the length direction is smaller than or equal to the size in the width direction. Therefore, the "length", "width" and the "thickness" mentioned later are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation configuration. and operation, and therefore should not be construed as limiting the invention.

According to the processing steps of the cover plate 11 in the above description, select a metal material strip 200 that is roughly equal in width to the upper and lower dimensions of the middle cover plate 11, and then stamp the metal material strip 200 along the width direction, and the cut part after stamping Constitute the middle cover 11, the cut surface formed by the stamping tool on the middle cover 11 constitutes the left side s3 or the right side s4 of the middle cover 11, and the opposite side of the original width direction of the metal strip 200 is processed into The middle cover 11 is formed in each case as an upper side s1 and a lower side s2 of the middle cover 11 .

Here, the size of the metal strip 200 in the set direction is roughly equal to the size of the middle cover plate 11 in the vertical direction, which means that the width of the metal strip 200 is approximately equal to the size of the middle cover plate 11 in the vertical direction. It can be understood that, before the middle cover plate 11 is processed from the metal material strip 200 into a final product, a series of surface processing treatments are required, such as grinding, debuffing, cleaning, sandblasting, etc., considering that the material will undergo slight deformation after processing and size changes, so the width of the metal strip 200 is slightly larger than the size of the middle cover plate 11 in the up-down direction when taking materials, and the difference between the width dimension of the metal strip 200 and the size of the middle cover plate 11 in the up-down direction does not exceed One-tenth of the size of the middle cover plate 11 in the up-down direction.

After the housing 100 of the mobile terminal is assembled, the left side s3 of the middle cover 11 is connected to the left side wall 103 of the housing 100, and the right side s4 of the middle cover 11 is connected to the right side wall 104 of the housing 100. Above, the upper side s1 of the middle cover 11 is connected to the upper cover 12 , and the lower side s2 of the middle cover 11 is connected to the lower cover 13 .

It can be understood that the metal strip has a large area and multiple processing methods, so a metal strip with flat sides in the width direction can be selected. After the metal strip 200 is punched into the middle cover plate 11 , as shown in FIG. 5 and FIG. 7 , the upper side s1 and the lower side s2 of the middle cover plate 11 are still plane. As shown in Figure 1, when the lower surface of the upper cover 12 is processed into a plane, the upper seam m1 formed after the assembly of the middle cover 11 and the upper cover 12 can be formed as a thin line, and the upper surface of the lower cover 13 When it is also processed into a plane, the lower seam m2 formed after the middle cover 11 and the lower cover 13 are assembled can be formed as a thin line. The aforementioned seams can even be weakened visually to the point of non-existence. In this way, after the seams of the back cover of the mobile terminal are thin and weakened, the appearance effect of the metal back cover assembly 1 being integrated at the seams is realized.

It can also be understood that, after the metal strip 200 is stamped by the tool, the pressing of the tool will cause slight deformation of the material. As shown in FIG. 6 and FIG. 8 , the middle cover 11 forms a process fillet 111 on the side pressed by the tool, that is, the middle cover 11 has process fillets 111 on the left side s3 and the right side s4 . Here, the parameter size of the process fillet 111 is determined by the material sheet parameters and stamping parameters. For example, when processing the back cover of a mobile phone, the parameter R of the process fillet 111 formed by stamping is 0.07.

After the housing 100 of the mobile terminal is assembled, as shown in FIG. On the right side wall 104 of 100, as shown in FIG. 2 , the process fillets 111 stamped and formed on the middle cover 11 are located on the left and right side walls of the housing 100, avoiding the process fillets 111 being formed at the eye-catching positions of the rear cover.

Since there is a left contour intersection line between the left side wall 103 of the housing 100 and the middle cover 11 , the process fillet 111 on the left side s3 of the middle cover 11 is adjacent to the left contour intersection. There is also a right contour intersection line between the right side wall 104 of the housing 100 and the middle cover 11 , and the process fillet 111 on the right side s4 of the middle cover 11 is adjacent to the right contour intersection. Therefore, the process fillet 111 is formed on the left side s3 and the right side s4 of the middle cover 11 , which has little effect on the overall appearance of the housing 100 .

Compared with the processing method of the embodiment of the present invention, there is also a similar processing method, which is to punch the metal strip along the set direction to obtain the middle cover plate 11', and the cut surface formed after the metal strip is stamped Constituting the upper side s1' or the lower side s2' of the middle cover 11', the size of the metal strip in the set direction is roughly equal to the size of the middle cover 11' in the left and right direction, and the center is formed by stamping as shown in Figure 9. The cover plate 11 ′, after the middle cover plate 11 ′ is assembled, the appearance effect of the integration of the rear cover assembly 1 ′ at the seam is greatly reduced.

Specifically, as shown in Figure 11 and Figure 13, after the metal strip is punched into the middle cover plate 11', the left side s3' and the right side s4' of the middle cover plate 11' were originally metal strips. The opposite sides in the width direction, therefore, the left side s3' and the right side s4' of the middle cover plate 11' are still plane.

As shown in Figure 10 and Figure 12, the cut surface formed after the stamping of the metal strip constitutes the upper side s1' or the lower side s2' of the middle cover 11', and the middle cover 11' forms a process circle on the side pressed by the tool. The corners 111', that is, the middle cover plate 11' have process rounded corners 111' on both the upper side s1' and the lower side s2'.

As shown in Figure 14, when such a middle cover 11' and an upper cover 12' are assembled, along the upper seam m1' between the middle cover 11' and the upper cover 12', the middle cover 11 The process fillet 111' of the upper side s1' of 'forms a wide slit. After such middle cover 11' and lower cover 13' are assembled, along the lower seam m2' between the middle cover 11' and the lower cover 13', the process of the lower side s2 of the middle cover 11 The rounded corners 111 also form a wide slit. In this way, after the housing 100' is assembled, the back of the housing 100' is obviously divided, and the user's sensory effect is poor.

After comparing with different processing methods, it can be clearly seen that according to the processing method of the rear cover assembly in the embodiment of the present invention, the middle cover plate 11 is processed by stamping process, which saves the processing cost and improves the processing efficiency. In addition, the stamping process makes the opposite sides of the middle cover plate 11 have process rounded corners 111. The wall, that is, the craft fillet 111 is hidden in a position that is not easy to see clearly, so that the visual gap on the back of the product is small and the product fineness is good.

In some embodiments, as shown in Figures 15-16, the processing of the middle cover plate 11 includes the following steps:

S1: Pre-punching the metal material strip 200 along a set direction to obtain the primary blank 201 of the middle cover plate, and the preliminary blank 201 of the middle cover plate is pre-punched out of the positioning plate 202 on the left side and/or the right side;

S2: pretreating the blank 201 of the middle cover plate to obtain the semi-finished product 203 of the middle cover plate;

S3: Punching off the semi-finished product 203 of the middle cover plate to remove the positioning plate 202 to obtain the middle cover plate 11 .

That is to say, the metal material strip 200 is punched at least twice during the process of being processed into the middle cover plate 11 , the first time is pre-stamping, and the last time is final punching. The pre-stamped middle cover blank 201 needs to be pretreated, so the positioning plate 202 is also punched out on the middle cover blank 201 during pre-stamping, so as to facilitate the pretreatment of the middle cover blank 201 place, and then cut off the positioning plate 202 during final punching to obtain the final product of the middle cover plate 11 .

Wherein, as shown in FIG. 17 and FIG. 19 , the opposite sides on the original width direction of the metal strip 200 are respectively configured as the upper and lower surfaces of the middle cover blank 201 after being processed into the middle cover blank 201, and the middle cover blank 201 is formed respectively. The top and bottom surfaces of the cover plate blank 201 retain the planar shape of the side surfaces of the metal strip 200 . The cut surface formed by the stamping tool on the blank 201 of the middle cover plate constitutes the left and right sides of the preliminary blank 201 of the middle cover plate. Process fillets 111 are formed on the left and right sides.

Since the positioning plate 202 is punched out on the primary blank 201 of the middle cover plate in step S1, when preprocessing is performed in step S2, the preliminary blank 201 of the middle cover plate can be erected or hung by the positioning plate 202, and the initial blank of the middle cover plate Both sides of the blank 201 can be well processed, which is convenient to ensure the processing quality of the middle cover plate 11 .

Optionally, in the pretreatment of step S2, the primary blank 201 of the middle cover plate is subjected to oxidation treatment. Oxidation treatment can form a layer of dense protective oxide film on the surface of the middle cover plate 11, which can solve defects in the hardness and wear resistance of the metal surface, prolong the service life of the metal and enhance the aesthetics.

Specifically, 1-3 positioning plates 202 are provided on the left side of the blank 201 of the middle cover plate, and 1-3 positioning plates 202 are provided on the right side of the blank 201 of the middle cover plate.

Of course, subject to the positioning requirements of the preliminary blank 201 of the middle cover plate during pretreatment, the positioning plate 202 may not be set on the left side of the preliminary blank 201 of the middle cover plate, or a plurality of positioning plates 202 may be set; On the right side of the blank 201, the positioning plate 202 may not be set, or a plurality of positioning plates 202 may be set, and the number of the positioning plates 202 on the blank 201 of the middle cover plate is not specifically limited here.

When positioning plates 202 are arranged on the left side and the right side of the primary blank 201 of the middle cover plate, the positioning plates 202 on both sides of the preliminary blank 201 of the middle cover plate can be arranged symmetrically, and the two sides of the preliminary blank 201 of the middle cover plate The positioning plates 202 can also be arranged in a staggered manner, which is not specifically limited here.

In some examples, as shown in FIG. 17 , the positioning plate 202 is formed in a sheet shape, and the positioning plate 202 is provided with a hanging hole 2021 penetrating in the thickness direction. That is to say, each positioning plate 202 is equivalent to a hanging lug, and the blank 201 of the middle cover plate can be hung during pretreatment. The sheet-shaped hanging lug has a simple structure, the structure of the stamping tool does not need to be too complicated, and the processing cost is low.

Specifically, as shown in Fig. 16 and Fig. 18, in step S1, positioning plates 202 are respectively processed on the left side and right side of the primary blank 201 of the middle cover plate, and the left side of the primary blank 201 of the middle cover plate is The positioning plates 202 on the side and the right side are respectively bent towards each other. In this way, the positioning surface of the positioning plate 202 is spaced a certain distance from the main body of the blank 201 of the middle cover plate, which facilitates the pretreatment of the surface of the blank 201 of the middle cover plate.

For example, during the pretreatment, both sides of the blank 201 of the middle cover plate are hung by hooks. Since the hanging lugs are bent relative to the blank 201 of the middle cover plate, the hooks are staggered from the blank 201 of the middle cover plate, so if there are other When tools (such as spray guns) spray on the left and right sides of the middle cover plate 11, the interference of the hooks to other tools can be avoided.

In some embodiments, as shown in FIG. 6 and FIG. 8 , the left side and the right side of the middle cover plate 11 are respectively bent forward. In this way, as shown in FIG. 3 , the middle cover plate 11 forms small-angle arcs 112 at the left side and the right side, making the appearance of the product round and beautiful.

Moreover, after the left side and the right side of the middle cover 11 are respectively bent forward, the left side s3 and the right side s4 of the middle cover 11 can be better fastened to the left side wall 103 and the right side of the housing 100. On the side wall 104, the product shell is connected more tightly.

In some specific embodiments, in the step S1 of processing the middle cover plate 11, the metal strip 200 is pre-stamped from the back to the front, as shown in Fig. 18 and Fig. The right sides are respectively bent forward to form an arc 112 with a small angle. That is to say, after the left and right sides of the preliminary blank 201 of the middle cover plate are bent, the preliminary blank 201 of the middle cover plate is subjected to pretreatment.

It can be understood that if the preliminary blank 201 of the middle cover plate is stamped to form a bending deformation after pretreatment, the surface of the preliminary blank 201 of the middle cover plate 201 during the pretreatment will be destroyed. Therefore, before the pretreatment, radians are punched out on the left and right sides, which can ensure the processing quality of the pretreatment of the middle cover plate 11 .

Specifically, in step S1, the positioning plate 202 is respectively processed on the left side and the right side of the blank 201 of the middle cover plate, and the positioning plate 202 on the left side and the right side of the blank 201 of the middle cover plate The plates 202 are respectively bent towards each other. There is an included angle between the positioning plate 202 and the blank 201 of the middle cover plate, and the extending direction of the positioning plate 202 is tangent to the bending direction of the left side or the right side of the middle cover plate 11 . In this way, it is possible to avoid damage to the positioning plate 202 due to excessive force during punching.

The processing method of the middle cover plate 11 according to a specific embodiment of the present invention will be described below with reference to FIG. 16 . The details are as follows: firstly, pre-punching is carried out on the metal material strip 200, and a piece of metal material is cut off to be used as the blank 201 of the middle cover plate. The stamping tool cuts out the left side and the right side of the middle cover blank 201 on the middle cover blank 201 . Afterwards, the intermediate cover plate blank 201 is oxidized to obtain the intermediate cover plate semi-finished product 203, and a dense oxide film is obtained on the surface of the intermediate cover plate semi-finished product 203. Finally, the semi-finished product 203 of the middle cover plate is stamped to cut off the hanging lugs to obtain the finished product of the middle cover plate 11 .

In the description of the present invention, unless otherwise clearly stipulated and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical A connection can also be an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In the description of this specification, a description referring to the terms "embodiment", "example" and the like means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (9)

1. A processing method of a rear cover assembly of a mobile terminal is characterized in that the rear cover assembly comprises a middle cover plate, an upper cover plate and a lower cover plate which are respectively and independently processed, the upper cover plate and the lower cover plate are respectively connected to the upper side and the lower side of the middle cover plate, the rear cover assembly is a metal piece, and the rear cover assembly comprises the following processing steps:

stamping a metal material belt along a set direction to obtain the middle cover plate, wherein a section formed by stamping the metal material belt forms a left side surface or a right side surface of the middle cover plate, the left side surface of the middle cover plate is suitable for being connected with a left side wall of a shell of the mobile terminal, the right side surface of the middle cover plate is suitable for being connected with a right side wall of the shell of the mobile terminal, and the size of the metal material belt in the set direction is approximately equal to the size of the middle cover plate in the vertical direction;

respectively processing the upper cover plate and the lower cover plate;

assembling the middle deck, the upper deck, and the lower deck into the rear cover assembly; wherein,

the processing of the middle cover plate comprises the following steps:

s1: pre-stamping a metal material belt along a set direction to obtain a middle cover plate primary blank, and pre-stamping a positioning plate on the left side and/or the right side of the middle cover plate primary blank;

s2: pretreating the middle cover plate blank to obtain a middle cover plate semi-finished product;

s3: and punching the semi-finished product of the middle cover plate and removing the positioning plate to obtain the middle cover plate.

2. The method of manufacturing a rear cover assembly of a mobile terminal as claimed in claim 1, wherein the intermediate lid blank is subjected to an oxidation process in the preprocessing of step S2.

3. The method for manufacturing a rear cover assembly of a mobile terminal as claimed in claim 1, wherein 1-3 alignment plates are provided on a left side edge of the middle cover plate blank member.

4. The method for manufacturing a rear cover assembly of a mobile terminal as claimed in claim 1, wherein 1-3 alignment plates are provided on a right side edge of the middle cover plate blank member.

5. The method of claim 1, wherein the positioning plate is formed in a sheet shape, and the positioning plate is provided with a hanging hole penetrating in a thickness direction.

6. The method of manufacturing a rear cover assembly for a mobile terminal according to claim 1, wherein left and right sides of the middle cover plate are respectively bent forward.

7. The method for processing a rear cover assembly of a mobile terminal as claimed in claim 1, wherein in step S1, the metal strip is pre-stamped from back to front to bend the left and right side edges of the middle cover blank forward.

8. The method of processing a rear cover assembly of a mobile terminal according to claim 1, wherein the positioning plates are processed on left and right side edges of the middle cover blank, respectively, and the positioning plates on the left and right side edges of the middle cover blank are bent toward each other, respectively, in step S1.

9. The method for manufacturing a rear cover assembly of a mobile terminal according to claim 7, wherein in step S1, the positioning plate has an included angle with the middle cover plate blank, and the extending direction of the positioning plate is tangential to the bending direction of the left side or the right side of the middle cover plate.