Method for manufacturing plastic shell with wire-drawing texture, plastic shell and electronic device

Abstract

The application provides a plastic shell preparation method with a wire-drawing texture, a plastic shell and an electronic device. The preparation method comprises the following steps: S1, injection molding a plastic part and forming a surface to be wire-drawn on the plastic part; S2, driving a wire-drawing cutter to move along the normal direction of the central axis of the wire-drawing cutter on the surface to be wire-drawn, so as to cut the wire-drawing texture on the surface to be wire-drawn and form the plastic shell. The wire-drawing cutter has a cutting surface extending along the circumferential direction of the central axis of the wire-drawing cutter. A plurality of cutting grooves are arranged on the cutting surface of the wire-drawing cutter. The plurality of cutting grooves are arranged in sequence along the extension direction of the central axis, and the cutting grooves extend along the circumferential direction of the central axis. The plastic shell prepared by the preparation method does not have injection molding line clamping, and the appearance and yield of the plastic shell are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of surface treatment, in particular to a plastic shell with wire-drawing texture, a plastic shell and an electronic device. BACKGROUND

[0002] The surface wire-drawing method is a surface treatment method for making a textured surface on a metal or plastic surface with a wire-drawing material. In recent years, the surface wire-drawing process has been increasingly applied to digital shell, such as notebook panel, keyboard and mobile phone frame. Common surface treatment processes include In-Mold Labeling (IML), In-Mold Roller / Roll Film / Rotary / Transfer (IMR) and In-Mold-Trimming (IMT).

[0003] Electronic devices such as mobile phones and tablet computers often use metal or plastic materials as the shell. In order to improve the grade of the shell, various decorative effects such as wire-drawing texture are often made on the surface of the shell. The wire-drawing texture on the current plastic shell is generally processed by splicing four injection molds during the injection molding stage of the shell, wherein the wire-drawing texture is formed on the mold by a scribing process, and each mold corresponds to one edge of the shell. However, there is a gap between the corresponding adjacent two molds at the four corners of the shell, so there is a line at the four corners of the shell, which affects the appearance of the shell. SUMMARY

[0004] The present application provides a plastic shell with wire-drawing texture, a plastic shell and an electronic device, which solves the problem of the existing plastic shell with wire-drawing texture.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, a method for preparing a plastic shell with wire-drawing texture includes:

[0007] Step S1, injection molding a plastic part and forming a wire-drawing surface on the plastic part;

[0008] Step S2, driving a wire-drawing knife to move along the normal direction of the central axis of the wire-drawing knife on the wire-drawing surface to cut out wire-drawing texture on the wire-drawing surface and form a plastic shell; wherein the wire-drawing knife has a cutting surface extending in the circumferential direction of the central axis of the wire-drawing knife, a plurality of cutting grooves are formed on the cutting surface of the wire-drawing knife, the plurality of cutting grooves are arranged in sequence along the extension direction of the central axis, and the cutting grooves extend in the circumferential direction of the central axis.

[0009] The cutting groove can be arranged around the wire drawing knife or only in a local area of the wire drawing knife, which is not limited herein. The cross section of the cutting groove can be inverted triangular, trapezoidal, quadrangular, etc. The groove side surface of the cutting groove can be planar or curved, which is not limited herein. The wire drawing knife can be driven by computerized numerical control (CNC).

[0010] The prepared plastic shell does not have injection molding wire clamping, which improves the aesthetic appearance of the plastic shell. Meanwhile, the wire drawing knife can be applied to the processing of wire drawing textures on various structural parts, without the need to set a specific injection molding mold, thereby saving cost and improving the yield of finished products. The preparation method provides a new idea for the processing of wire drawing textures in the industry.

[0011] In one embodiment of the first aspect, the openings of the two adjacent cutting grooves are spaced apart, and the two opposite groove side surfaces of the cutting groove are spaced apart. In this way, the first platform is formed between the openings of the two adjacent cutting grooves, and the second platform is formed between the two groove side surfaces, the wire drawing knife cuts the groove bottom surface in the groove through the first platform, and cuts the top surface of the convex strip through the second platform, thereby eliminating the sharp top of the convex strip and the sharp bottom of the groove, reducing the roughness of the wire drawing texture surface, and improving the aesthetic appearance of the wire drawing texture. Meanwhile, the first platform and the second platform can reduce the depth of the groove of the second jagged surface, and in the process of forming the appearance coating on the wire drawing texture surface, the use of coating material can be reduced while ensuring the smoothness of the surface of the appearance coating.

[0012] In one embodiment of the first aspect, the groove width of the cutting groove gradually increases in the direction from the groove bottom surface to the opening. In this way, the surface with a sawtooth-shaped cross section can be formed on the cutting block, and the cross section of the wire drawing texture cut by the wire drawing knife is also sawtooth-shaped, and the visual effect of the wire drawing texture in this form is more obvious.

[0013] In one embodiment of the first aspect, the groove side surface of the cutting groove is chamfered with the cutting surface, and the groove side surface of the cutting groove is chamfered with the groove bottom surface. In this way, the top angle between the top surface and the side surface of the convex strip is also chamfered, and the groove bottom surface and the groove side surface of the groove are also chamfered. In this way, the edges and corners of the convex strip and the groove angle of the groove are eliminated, so that the structural strength of the convex strip is greater, and the heat generated during the cutting process of the wire drawing knife does not cause the edge part of the convex strip to deform into an uncontrollable shape or the groove angle part of the groove to melt too much due to heat concentration.

[0014] In one embodiment of the first aspect, the depth of the cutting groove is 10-40 um. The visual effect of the wire drawing texture cut by the cutting groove with this depth is more obvious, and the appearance coating surface is not uneven due to excessive depth.

[0015] In one embodiment of the first aspect, the included angle between the two groove sides of the cutting groove is 95-105°. This can make the width of the cutting groove larger, so that the visual effect of the wire-drawing texture is more obvious.

[0016] In one embodiment of the first aspect, the width of the groove bottom surface of the cutting groove is 10-15 um. At this width, the deformation of the convex strip top caused by the heat generated during the cutting of the wire-drawing knife can be reduced.

[0017] In one embodiment of the first aspect, the width of the groove bottom surface of the cutting groove is equal to the spacing distance between the openings of two adjacent cutting grooves, so as to improve the visual aesthetics.

[0018] In one embodiment of the first aspect, the wire-drawing knife comprises a knife holder and at least one cutting block, the knife holder extends along the extension direction of the central axis, the cutting block is connected to the knife holder and has a cutting surface, a first side surface and a second side surface, the first side surface and the second side surface are opposite to each other, the cutting surface is connected to the first side surface and the second side surface, the cutting surface protrudes from the peripheral surface of the knife holder and extends circumferentially along the central axis, a plurality of cutting grooves are formed in the cutting surface, and the two extension ends of the cutting groove pass through the first side surface and the second side surface. In this way, the wire-drawing knife has a cutting edge by arranging the cutting block protruding from the peripheral surface of the knife holder, which can improve the cutting force on the plastic part, without the need to thin the plastic part by grinding, thereby improving the preparation efficiency of the plastic shell with wire-drawing texture. A general knife holder can be used to obtain a wire-drawing knife that meets the requirements by fixedly connecting cutting blocks of different shapes, positions and numbers, which saves cost and facilitates the processing of the wire-drawing knife.

[0019] In one embodiment of the first aspect, two cutting blocks are provided, and the two cutting blocks are arranged in axial symmetry with the central axis as the axis of symmetry, so that the force is balanced when the knife holder rotates, and the wire-drawing knife is prevented from shaking when it is in the working state. In other embodiments, the cutting block can also be provided with three or more, or arranged around the peripheral surface of the knife holder, which is not limited here.

[0020] In one of the embodiments of the first aspect, in the step S2, the wire drawing knife is in a working state of rotating around the central axis. The wire drawing knife in the working state has higher cutting efficiency and better cutting effect, and can reduce the elastic deformation of the plastic shell. In other embodiments, the wire drawing knife can also be in a static state when driving the wire drawing knife to move on the surface to be drawn, and the surface to be drawn is cut by the fast sliding of the wire drawing knife. Here, no limitation is made as long as the wire drawing knife moves on the surface to be drawn along the normal direction of the central axis of the blade holder of the wire drawing knife. Of course, the movement of the wire drawing knife on the surface to be drawn is relative movement, and the plastic shell can move while the position of the wire drawing knife remains unchanged, and no limitation is made here.

[0021] In one of the embodiments of the first aspect, in the step S1, after the step of injection molding the plastic part, the injection surface of the plastic part is polished to form a surface to be drawn with a smooth surface to be drawn, so as to reduce the resistance when the wire drawing knife cuts. In other embodiments, after the plastic part is injection molded by the injection shell, the injection surface can also not be polished, but the wire drawing knife is directly driven to cut the injection surface of the plastic part to directly mill off the boss or the injection line and form the wire drawing texture.

[0022] In one of the embodiments of the first aspect, in the step S2, after the wire drawing texture is formed, a step of forming an appearance coating layer on the wire drawing texture is further included. The appearance layer can fill the grooves on the wire drawing texture, play a decorative role, improve the hand feeling, avoid dust from being stuck in the grooves, and also have the effects of wear resistance and corrosion resistance.

[0023] In one of the embodiments of the first aspect, in the step S1, the plastic part is injection molded in the injection shell, and the injection shell includes a plurality of spliced injection molds to facilitate mold opening.

[0024] The second aspect provides a plastic shell prepared by the preparation method described in the above embodiments. The wire drawing texture of the plastic shell prepared by the preparation method is continuous and has no injection line, and the aesthetic degree is greatly improved.

[0025] In one of the embodiments of the second aspect, the wire drawing texture is arranged around the plastic shell, so that the frame of the plastic shell has the wire drawing texture and the hand feeling is improved.

[0026] The third aspect provides an electronic device including the plastic shell described in the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 FIG. 1 is a perspective view of an electronic device provided by an embodiment of the present application;

[0028] Figure 2A structural arrangement diagram of a preparation method of a plastic shell body with a wire-drawing texture;

[0029] Figure 3 A partial structural diagram of a plastic shell body prepared by the preparation method in Figure 2

[0030] Figure 4 A structural arrangement diagram of a preparation method of another plastic shell body with a wire-drawing texture;

[0031] Figure 5 A structural diagram of a plastic shell body prepared by the preparation method in Figure 4

[0032] A three-dimensional structural diagram of a wire-drawing knife provided by an embodiment of the present application; Figure 6

[0033] A partial sectional view of a wire-drawing knife provided by an embodiment of the present application and a wire-drawing texture cut by the wire-drawing knife; Figure 7

[0034] A step diagram of a preparation method of a plastic shell body with a wire-drawing texture provided by an embodiment of the present application; Figure 8

[0035] A sectional view of a preparation method provided by an embodiment of the present application, in which an injection-molded shell is injection-molded to form a plastic part; Figure 9

[0036] A structural arrangement diagram of a preparation method provided by an embodiment of the present application, in which a polishing wheel is polished; Figure 10

[0037] A structural arrangement diagram of a preparation method provided by an embodiment of the present application, in which a wire-drawing knife is used to cut a wire-drawing texture; Figure 11

[0038] A top view of a wire-drawing knife provided by another embodiment of the present application; Figure 12

[0039] A top view of a wire-drawing knife provided by still another embodiment of the present application; Figure 13

[0040] A top view of a wire-drawing knife provided by still another embodiment of the present application. Figure 14 Explanation of reference numerals:

[0041]

[0042] ​​100, electronic device; 10, plastic shell; 11, first frame part; 12, second frame part; 13, third frame part; 14, fourth frame part; 20, wire-drawing texture; 201, groove; 21, second sawtooth surface; 30, wire-drawing knife; 301, cutting face; 302, cutting groove; 3021, groove side face; 303, cutting edge; 304, first side face; 305, second side face; 31, knife holder; 3101, peripheral side face; 3102, mounting groove; 32, cutting block; 3011, first sawtooth surface; 40, polishing wheel; 81, plastic part; 82, wire-drawing part; 801, injection-molding face; 802, wire-drawing surface; 90, injection-molding shell; 91, 92, injection-molding mold; 200, display screen;

[0043] 10', plastic shell; 101', boss. DETAILED DESCRIPTION

[0044] Embodiments of the present application are described below in detail with reference to the accompanying drawings, in which like or similar elements or components are denoted throughout by like reference numerals, and examples of the embodiments are shown in the drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0045] In the description of the present application, it should be understood that the terms "inner", "outer", and the like indicate the positional or location relationship based on the positional or location relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0046] In order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, the terms "first", "second", and the like are used to distinguish the same or similar items or components with basically the same function and role. For example, the first limiting part and the second limiting part are only used to distinguish different limiting parts, and do not limit the order. Those skilled in the art can understand that the terms "first", "second", and the like do not limit the number and execution order, and the terms "first", "second", and the like do not necessarily mean different.

[0047] It should be noted that in the present application, the words "in one embodiment" or "for example" are used to indicate an example, illustration or description. Any embodiment or design scheme described as "in one embodiment" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of the words "in one embodiment" or "for example" is intended to present the relevant concept in a specific way.

[0048] In this application, unless otherwise expressly specified and limited, the terms "connected", "connecting", and similar terms are to be construed broadly and are intended to encompass both direct connections and indirect connections, mechanical connections, electrical connections, and connections through intermediate media, as well as internal connections and mutual interactions between two elements. The specific meaning of the above terms in this application can be understood according to the specific circumstances by those of ordinary skill in the art.

[0049] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0050] The surface wire-drawing method is a surface treatment method for making a textured surface on a metal or plastic surface. In recent years, the surface wire-drawing process has been increasingly applied to notebook panels, keyboards and mobile phone frames in digital housings. Common surface treatment processes include in-mold insert injection molding, in-mold transfer printing and embedded three-dimensional injection molding.

[0051] Electronic devices often use metal or plastic materials as housings. In order to improve the grade of the housing, various decorative effects such as wire-drawing texture are usually made on the surface of the housing.

[0052] For a metal housing, the surface wire-drawing texture can be directly formed by a wire-drawing wheel. The wire-drawing wheel includes a cylindrical wheel body and one or more layers of abrasive particles adhered to the peripheral surface of the wheel body. The abrasive particles are generally silicon carbide, aluminum oxide or other hard abrasive materials. However, for a plastic housing, since the texture is relatively soft, using a wire-drawing wheel to grind will not only fail to produce a wire-drawing effect, but also will make the surface of the plastic housing more and more smooth.

[0053] Embodiments of the present application provide an electronic device, which includes but is not limited to a mobile phone, a tablet personal computer, a watch, a notebook computer, an ultra-mobile personal computer (UMPC), a handheld computer, a walkie-talkie, a netbook, a POS machine, a personal digital assistant (PDA), a driving recorder, a security device, a wearable device, a virtual reality device and other mobile or fixed terminals with a display screen.

[0054] Please refer to Figure 1 Embodiments of the present application also provide a plastic housing 10. The electronic device 100 includes the plastic housing 10, which can be used as a frame of the electronic device 100 or a bracket with a frame in the electronic device 100. The plastic housing 10 has a wire-drawing texture 20 formed thereon.

[0055] Taking the electronic device 100 as a mobile phone as an example, the electronic device 100 comprises a support, a back cover, a control assembly and a display screen 200, the support comprises a middle frame and a plastic shell 10 arranged around the middle frame, the plastic shell 10 is in the shape of a square frame, the control assembly is installed on the middle frame, the control assembly comprises a control mainboard, a battery and electronic components such as chips and loudspeakers arranged on the control mainboard, and the display screen 200 and the back cover are arranged on the upper and lower sides of the middle frame respectively and are both connected with the plastic shell 10.

[0056] The plastic shell 10 comprises a first frame part 11, a second frame part 12, a third frame part 13 and a fourth frame part 14 connected end to end, the first frame part 11, the second frame part 12, the third frame part 13 and the fourth frame part 14 jointly form a square frame, the first frame part 11 is parallel to the third frame part 13, the second frame part 12 is parallel to the fourth frame part 14, and the adjacent two frame parts are chamfered. The wire drawing texture 20 surrounds the plastic shell 10 and is located on the outer ring surface of the plastic shell 10.

[0057] Please refer to Figure 2 and Figure 3 , the wire drawing texture on the current plastic shell 10' is generally formed by injection molding of the injection molding shell 90, the injection molding shell 90 is made of metal material, and the wire drawing texture is formed on the injection molding shell 90 by means of sunning texture and the like. In order to facilitate mold opening, the injection molding shell 90 is generally spliced by a plurality of injection molding molds 91, and after injection molding is completed, the spliced injection molding molds 91 are removed to obtain the plastic shell 10' with the wire drawing texture. However, for the position of splicing of the adjacent two injection molding molds 91, due to the existence of the gap, the injection molding clip line 11' or the boss 101' will be formed on the plastic shell 10'. For example, Figure 2 For the injection molding of the plastic shell 10' on the mobile phone, if four injection molding molds 91 are used to form the injection molding shell 90 by splicing end to end, the four injection molding molds 91 can jointly form a frame shape, each injection molding mold 91 forms one frame part of the plastic shell 10', and the chamfered corner between the adjacent two frame parts will have the injection molding clip line 11' extending along the thickness direction of the plastic shell 10' (for example, Figure 4 ), which affects the appearance of the plastic shell 10', so that the preparation method of the wire drawing texture can only be used on the plane and cannot meet the design requirements for the plastic shell 10' with a curved surface with a round corner. For example, Figure 3 If two frame-shaped injection molding molds 92 are used to form the injection molding shell 90 by stacking and splicing, each injection molding mold 92 is in the shape of a frame, but the injection molding thickness is half of the thickness of the plastic shell 10', in order to avoid scratching the plastic shell 10' when opening the mold, the inner ring surfaces of the two injection molding molds 92 need to be arranged at an obtuse angle, so as to form the boss 101' extending around the plastic shell 10' on the circumferential surface of the plastic shell 10' (for example, Figure 5), and subsequently, the boss 101' needs to be milled by computer numerical control technology, so that the peripheral side surface of the plastic shell 10' is flat, but the formed wire drawing texture will also disappear with the removal of the boss 101'.

[0058] To solve the above problems, please refer to Figure 6 and Figure 7 , the embodiment of the present application provides a wire drawing knife 30, the wire drawing knife 30 is a cylindrical structure, the wire drawing knife 30 has a cutting surface 301 extending along the circumferential direction of the central axis of the wire drawing knife 30, the wire drawing knife 30 is provided with a plurality of cutting grooves 302 on the cutting surface 301, the plurality of cutting grooves 302 are arranged in sequence along the extension direction of the central axis of the wire drawing knife 30, the cutting groove 302 extends along the circumferential direction of the central axis and surrounds the wire drawing knife 30, at this time, the cutting groove 302 is a ring groove. At this time, the cutting groove 302 has two opposite groove side surfaces 3021, each groove side surface 3021 extends along the circumferential direction of the central axis of the wire drawing knife 30, and the connecting line direction of the two groove side surfaces 3021 is the width direction of the cutting groove 302.

[0059] Among them, the groove width of the cutting groove 302 gradually increases in the direction from the groove bottom surface to the groove opening, at this time, the wire drawing knife 30 forms a surface with a sawtooth-shaped cross section, which is referred to as a first sawtooth-shaped surface 3011 below, in this way, the structural strength of the tooth edge on the first sawtooth-shaped surface 3011 can be improved, and the visual effect of the wire drawing texture 20 processed can also be improved. Among them, the wire drawing knife 30 is made of a hard metal material, such as iron, stainless steel, an alloy containing a large amount of tungsten, molybdenum, chromium, vanadium and the like, so as to improve the rigidity and cutting force of the wire drawing knife 30.

[0060] The embodiment of the present application also provides a preparation method of a plastic shell with a wire drawing texture, please refer to Figure 8 , the preparation method of the plastic shell 10 with a wire drawing texture 20 includes:

[0061] Step S1, as shown in Figure 9 , two frame-shaped injection molds 92 are stacked and spliced to form an injection shell 90, the inner annular surfaces of the two injection molds 92 form an obtuse angle, a plastic part 81 in a frame shape is formed by injection molding through the injection shell 90, the plastic part 81 has an injection surface 801 extending around the plastic part 81, the injection surface 801 forms a boss extending around the plastic part 81, and then a polishing wheel 40 in a rotating working state is used to polish the injection surface 801 (as shown in Figure 10 ) to mill the boss and form a wire drawing part 82 with a smooth wire drawing surface 802 (as shown in Figure 11 );

[0062] Step S2, drive the drawing knife 30 to rotate around the center axis of the drawing knife 30, at this time the drawing knife 30 is in working state, the center axis of the drawing knife 30 is the rotation axis of the drawing knife 30, and the center axis of the drawing knife 30 is parallel to the surface 802 to be drawn, then drive the drawing knife 30 in working state to move towards the surface 802 to be drawn along the direction perpendicular to the surface 802 to be drawn (as shown in Figure 12 ), so that the drawing knife 30 cuts into the surface 802 to be drawn to a certain depth, at this time, since the cutting block 32 of the drawing knife 30 is formed with the first sawtooth surface 3011, the surface 802 to be drawn can be cut to form a surface with sawtooth cross section, which is referred to as second sawtooth surface 21 below, and the second sawtooth surface 21 can be engaged with the first sawtooth surface 3011, then drive the drawing knife 30 to move along the circumference of the surface 802 to be drawn, after the surface 802 to be drawn is cut by the drawing knife 30, a plurality of convex strips arranged in sequence are formed on the surface 802 to be drawn, the extension directions of the plurality of convex strips are parallel to each other, each convex strip is substantially matched with the corresponding cutting groove 302 on the drawing knife 30, and the plurality of convex strips collectively form the drawing texture 20, then an appearance coating is formed on the drawing texture 20, and finally the plastic shell 10 with the drawing texture 20 is obtained.

[0063] The preparation method forms the drawing texture 20 on the plastic shell 10 by the drawing knife 30, the drawing texture 20 does not have injection molding lines, the appearance of the plastic shell 10 is improved, the drawing knife 30 can be applied to the processing of the drawing texture 20 on various structural parts, a special injection mold 91 does not need to be arranged, the cost is saved, and the yield of finished products is improved. The preparation method provides a new idea for the processing of the drawing texture 20 in the industry.

[0064] In step S1, the injection shell 90 can also be formed by four injection molds 91 connected end to end, each injection mold 91 forms a frame part of the plastic shell 10, the injection surface 801 formed by the injection shell 90 is formed with injection lines at the four rounded corners of the plastic shell 10, the injection lines extend along the thickness direction of the plastic shell 10, and when the polishing wheel 40 is used to polish the injection surface 801, the movement direction of the polishing wheel 40 is also the circumferential direction of the plastic shell 10, and the injection surface 801 can remove the injection lines, bosses, watermarks, concave printing, raised particles and the like after polishing to obtain a smooth surface 802 to be drawn.

[0065] Of course, the movement direction of the polishing wheel 40 can also be other directions, for example, the thickness direction of the plastic shell 10, and the polishing wheel 40 can also be in a non-rotating state when polishing, as long as the polishing effect can be achieved. In addition, the polishing wheel 40 can polish the entire injection surface 801 when polishing, or only polish a local area, for example, only polish the injection lines, bosses, watermarks, concave printing or raised particles and the like to obtain a smooth surface 802 to be drawn.

[0066] In another embodiment, the plastic part 81 can also not be polished, and the injection molding surface 801 of the drawn part 30 can be directly ground. The drawn knife 30 can mill off the injection molding clip, boss, watermark, concave printing, raised particles, etc. on the injection molding surface 801 during the grinding process, and obtain the drawn texture 20. The processing efficiency is higher, and the cost is more economical.

[0067] For other forms of plastic shell 10, the extension direction and setting position of the drawn texture 20 can be set according to design requirements, and are not limited to the setting mode in the embodiment.

[0068] In this embodiment, after the appearance coating layer is formed on the drawn texture 20, a smooth coating surface can be obtained, the hand feeling and visual effect are improved, and dust is prevented from being stuck in the groove 201.

[0069] The step of forming the appearance layer can include: first spraying a primer on the drawn texture 20 to fill the groove 201 formed between the two adjacent convex strips, while enhancing the adhesion between the remaining coating and the plastic shell 10, then spraying an intermediate paint to increase the coating film thickness and supplement the filling effect of the primer, and then spraying a topcoat on the intermediate paint. The topcoat can have a decorative effect, while being resistant to wear, scrubbing and chemical corrosion.

[0070] In some embodiments, a metal film can also be deposited between the intermediate paint and the primer by using a non-conductive vacuum metallization (NCVM) technology to improve the metal luster, so as to provide excellent visual effect, while improving the wear resistance, corrosion resistance and ultraviolet resistance of the plastic shell 10.

[0071] Non-conductive vacuum metallization is an advanced surface treatment process. This technology is mainly applied to the surface decoration and functional coating of the plastic shell 10. In this embodiment, a thin metal film such as aluminum, chromium, titanium, etc. can be deposited on the primer surface of the plastic shell 10, so as to give the plastic shell 10 a metallic luster and texture, while maintaining the non-conductive property of the plastic shell 10 itself.

[0072] In other embodiments, the appearance coating surface can also be uneven, and the appearance coating can be coated according to design requirements. The appearance layer can include one or more of the primer, the intermediate paint, the metal film and the topcoat, which are not limited here.

[0073] On the current plastic shell with the wire-drawing texture 20, the cross section of the convex strip is triangular, that is, the convex strip is all pointed top, and the cross section of the groove 201 between the adjacent two convex strips is inverted triangular, that is, the groove 201 is all pointed bottom, so as to facilitate the scribing process. However, the melting point of the plastic is relatively low, if the common zigzag blade is used for cutting, in the process of driving the wire-drawing blade 30 to cut the wire-drawing texture 20, the pointed top of the convex strip formed on the surface 802 to be drawn will be melted or deformed due to the heat generated in the cutting process, and the pointed bottom of the groove 201 will also be melted and widened due to the heat concentration, resulting in the rough surface of the wire-drawing texture 20, which cannot meet the design requirements.

[0074] To solve this problem, please refer to Figure 6 and Figure 7 In the embodiment of the present application, the adjacent two cutting grooves 302 on the wire-drawing blade 30 are spaced apart, and the gap between the openings of the adjacent two cutting grooves 302 forms a first platform, that is, the two groove side surfaces 3021 of the adjacent two cutting grooves 302 are connected by the table surface of the first platform, and the opposite two groove side surfaces 3021 of the cutting groove 302 are spaced apart, and the second platform is formed between the two groove side surfaces 3021, that is, the two groove side surfaces 3021 of the cutting groove 302 are connected by the table surface of the second platform. In this way, the wire-drawing blade 30 cuts the groove bottom plane in the groove 201 through the first platform, and cuts the top plane on the top of the convex strip through the second platform, eliminating the pointed top of the convex strip and the pointed bottom of the groove 201, thereby reducing the roughness of the surface of the wire-drawing texture 20 and improving the aesthetic appearance of the wire-drawing texture 20. At the same time, the first platform and the second platform can reduce the depth of the groove 201 of the second zigzag surface 21, and in the process of forming the appearance coating on the surface of the wire-drawing texture 20, the coating material can be reduced while ensuring the smoothness of the surface of the appearance coating.

[0075] In order to further reduce the heat generated during the cutting of the wire-drawing blade 30, cutting fluid can be added between the wire-drawing blade 30 and the piece to be drawn 82 during the cutting of the wire-drawing blade 30, so as to reduce the heating of the piece to be drawn 82 and improve the cutting precision, and at the same time, the flying of the cutting debris can be avoided.

[0076] Optionally, the width of the table surface of the second platform is 10-15 um, that is, the width of the groove bottom surface of the cutting groove 302 is 10-15 um, and the width of the top plane of the convex strip processed by the wire-drawing blade 30 is also about 10-15 um, under this width, the deformation of the top of the convex strip caused by the heat generated during the cutting of the wire-drawing blade 30 can be reduced.

[0077] Optionally, the width of the groove bottom surface of the cutting groove 302 is equal to the interval distance between the openings of the adjacent two cutting grooves 302, that is, the width of the table surface of the first platform is equal to the width of the table surface of the second platform, so as to improve the visual aesthetic appearance.

[0078] Optionally, please refer to Figure 7, the chamfering is performed between the groove side surface 3021 of the cutting groove 302 and the cutting surface 301, and between the groove side surface 3021 of the cutting groove 302 and the groove bottom surface, so that the top corners between the top surface and the side surface of the convex strip are all chamfered, and the groove bottom surface and the groove side surface 3021 of the groove 201 are also all chamfered, so that the edges of the convex strip and the groove corners of the groove 201 are eliminated, the structural strength of the convex strip is greater, and the edges of the convex strip are deformed into uncontrollable shapes or the groove corners are excessively melted due to heat concentration during the cutting process of the wire drawing knife 30.

[0079] The depth of the groove 201 between the adjacent two teeth blades in the wire drawing texture 20 formed by the injection molding of the current plastic shell 10 through the injection mold 91 is relatively shallow, but the plastic material has a certain elasticity, and the wire drawing knife 30 will push the surface 802 to be drawn to be deformed downward during the sinking process of the wire drawing knife 30 toward the surface 802 to be drawn. If the depth of the cutting groove 302 of the wire drawing knife 30 is the same as the depth of the groove 201 in the current wire drawing texture 20, the depth of the groove 201 in the wire drawing texture 20 formed will be shallower, and finally the effect of the wire drawing texture 20 cannot be presented or the effect is poor.

[0080] In the embodiment of the present application, the depth of the cutting groove 302 is 10-40 um, so that the wire drawing texture 20 is more obvious, and the appearance of the coating surface is not uneven due to the excessive depth.

[0081] The angle between the two groove side surfaces 3021 of the groove 201 in the wire drawing texture 20 on the current plastic shell 10 is generally 90°, but in the embodiment of the present application, with the increase of the depth of the cutting groove 302, please refer to Figure 7 , the angle a between the two groove side surfaces 3021 of the cutting groove 302 is 95°-105°, so that the width of the cutting groove 302 is larger, so that the visual effect of the wire drawing texture 20 is obvious.

[0082] Correspondingly, in the case that the depth of the cutting groove 302 is 10-40 um and the angle between the two groove side surfaces 3021 is 95°-105°, the width of the cutting groove 302 is 50-100 um, and further can be selected as 80-90 um.

[0083] In another embodiment, please refer to Figure 12 , the wire drawing knife 30 comprises a knife holder 31 and a cutting block 32 connected to each other. The knife holder 31 extends along the extension direction of the center axis to form a columnar structure, and the knife holder 31 has a peripheral side surface 3101 surrounding the center axis of the knife holder 31. The cutting block 32 is connected to the peripheral side surface 3101 of the knife holder 31.

[0084] The cutting block 32 has a cutting surface 301, a first side surface 304 and a second side surface 305, the first side surface 304 is opposite to the second side surface 305, the cutting surface 301 is connected with the first side surface 304 and the second side surface 305, the cutting surface 301 protrudes from the circumferential surface 3101 of the cutter holder 31 and extends along the central axis in a circumferential direction, a plurality of cutting grooves 302 are formed on the cutting surface 301, and two extension ends of the cutting groove 302 penetrate the first side surface 304 and the second side surface 305. In this way, the cutting edge 303 is formed at the joint between the cutting surface 301 and the first side surface 304 and the joint between the cutting surface 301 and the second side surface 305, which can cut the to-be-drawn part 82 (such as Figure 11 ) to improve the removal strength and depth of the problem area of the to-be-drawn part 82, without the need to thin the to-be-drawn part 82 by grinding, thereby improving the preparation efficiency of the plastic shell 10 with the drawing texture 20, and the general cutter holder 31 can be used to obtain the drawing cutter 30 meeting the requirements by fixedly connecting the cutting blocks 32 with different shapes, positions and numbers, thereby saving costs and facilitating the processing of the drawing cutter 30.

[0085] In this embodiment, the cutting block 32 is made of a hard metal material, such as iron, stainless steel, an alloy containing a large amount of tungsten, molybdenum, chromium, vanadium and the like, and the cutter holder 31 can only provide support for the cutting block 32.

[0086] The connection mode between the cutter holder 31 and the cutting block 32 can be various.

[0087] In the embodiment shown in Figure 12 , the cutter holder 31 is in a cylindrical shape, and two cutting blocks 32 are arranged on the circumferential surface 3101 of the cutter holder 31 and are symmetrically arranged about the central axis of the drawing cutter 30, so that the cutter holder 31 is balanced when rotating and the drawing cutter 30 is prevented from shaking when in a working state. The cutting grooves 302 at the corresponding positions on the two cutting blocks 32 can be located on the same straight line, so that the two cutting blocks 32 can cut the same drawing texture 20, thereby improving the processing speed of the drawing texture 20.

[0088] Of course, the cutting grooves 302 on the two cutting blocks 32 can be misaligned, so that the two cutting blocks 32 cut grooves 201 at different positions. In this way, the number of cutting grooves 302 on the cutting block 32 can be small and sparse, thereby improving the structural strength of the cutting block 32. The arrangement of the two cutting blocks 32 can also save materials and reduce the processing cost of the drawing cutter 30.

[0089] The cutting block 32 and the cutter holder 31 can be fixedly connected by welding, bonding or the like, or can be integrally formed.

[0090] In order to improve the structural strength of the drawing cutter 30, please refer toFigure 13 The peripheral side surface 3101 of the tool holder 31 can be provided with a mounting groove 3102, and the cutting block 32 is partially accommodated in the mounting groove 3102, and the second side surface 305 abuts against at least one side wall of the mounting groove 3102, which can provide a support force to the cutting block 32 when the wire drawing die 30 is cutting, so as to improve the structural stability of the wire drawing die 30.

[0091] In Figure 13 In the embodiment shown in the figure, the cutting block 32 is formed with a cutting edge 303, which is the joint of the cutting surface 301 and the first side surface 304 of the cutting block 32, and the cutting edge 303 is parallel to the central axis of the wire drawing die 30, and the cutting edge 303 is the position farthest from the central axis of the wire drawing die 30 on the cutting block 32, and at this time, the cutting groove 302 only needs to be through to the first side surface 304 of the cutting block 32 at one end, and the other end can be through or closed.

[0092] Of course, as Figure 14 The number of cutting blocks 32 can also be four, and can also be other numbers, and the plurality of cutting blocks 32 can be arranged at equal intervals along the circumference of the tool holder 31, so as to prevent the wire drawing die 30 from shaking when it is in a working state.

[0093] In other embodiments, the cutting grooves 302 on the cutting block 32 can also be different in size, such as alternating arrangement or arrangement from deep to shallow, and the structures of the cutting blocks 32 in the plurality of cutting blocks 32 can also be different, which is not limited here.

[0094] Finally, it should be pointed out that: the above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of manufacturing a plastic housing having a wire-drawing texture, characterized by, include: Step S1: Injection mold a plastic part and form a surface to be drawn on the plastic part; Step S2: Drive the wire drawing cutter to move along the normal direction of the central axis of the wire drawing cutter on the surface to be drawn, and the wire drawing cutter is in a working state of rotating about the central axis, so as to cut continuous parallel wire drawing texture on the surface to be drawn, and then form an appearance coating on the wire drawing texture to form a plastic shell; wherein, the wire drawing cutter has a cutting surface extending circumferentially along the central axis of the wire drawing cutter, and the wire drawing cutter has multiple cutting grooves on the cutting surface, the multiple cutting grooves being arranged sequentially along the extension direction of the central axis, and the cutting grooves extending circumferentially along the central axis. The width of the cutting groove gradually increases from the bottom surface to the opening. The openings of two adjacent cutting grooves are spaced apart, and a first platform with a width of 10-15 μm is formed between the openings of two adjacent cutting grooves. The two opposite sides of the cutting groove are spaced apart, and a second platform with a width of 10-15 μm is formed between the two opposite sides of the cutting groove. The included angle between the two opposite sides of the cutting groove is 95°-105°. The cutting groove side and the cutting surface are rounded, and the cutting groove side and the bottom surface are rounded. The depth of the cutting groove is 10-40 μm.

2. The production method according to claim 1, characterized by, The cutting groove has a rounded corner between its side surface and the cutting surface, and a rounded corner between its side surface and the bottom surface.

3. The preparation method according to claim 1, characterized in that, The depth of the cutting groove is 10-40 μm.

4. The production method according to claim 3, characterized by, The included angle between the two sides of the cutting groove is 95°-105°.

5. The preparation method according to claim 1, characterized in that, The width of the bottom surface of the cutting groove is 10-15 μm.

6. The method of claim 1, wherein, The width of the bottom surface of the cutting groove is equal to the distance between the openings of two adjacent cutting grooves.

7. The production method according to any one of claims 1 to 6, characterized by, The wire drawing cutter includes a cutter holder and at least one cutting block. The cutter holder extends along the extension direction of the central axis. The cutting block is connected to the cutter holder and has a cutting surface, a first side surface, and a second side surface. The first side surface and the second side surface are opposite to each other. The cutting surface is in contact with the first side surface and the second side surface. The cutting surface protrudes from the peripheral side surface of the cutter holder and extends circumferentially along the central axis. The cutting surface has a plurality of sequentially arranged cutting grooves along the extension direction of the central axis, and the two extending ends of the cutting grooves penetrate the first side surface and the second side surface.

8. The production method according to claim 7, characterized by, The cutting block is provided in two parts, and the two cutting blocks are arranged symmetrically about the central axis.

9. The method of claim 1, wherein, In step S1, after the injection molding of the plastic part, the injection surface of the plastic part is further polished to form a smooth surface to be drawn.

10. The method of claim 1, wherein, In step S1, the plastic part is injection molded inside an injection molding shell, and the injection molding shell includes multiple spliced ​​injection molds.

11. A plastic housing, characterized by Prepared by the preparation method according to any one of claims 1 to 10.

12. The plastic housing of claim 11, wherein, The brushed texture is provided around the plastic housing.

13. An electronic device, comprising: Includes the plastic housing as described in claim 11 or 12.

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