CN115139365A

CN115139365A - Method for manufacturing structural member and electronic device

Info

Publication number: CN115139365A
Application number: CN202210738289.1A
Authority: CN
Inventors: 朱乘军
Original assignee: Hangzhou Douku Software Technology Co Ltd
Current assignee: Hangzhou Douku Software Technology Co Ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-10-04

Abstract

The application provides a manufacturing method of a structural part, which comprises the steps of forming a hardened layer on the surface of a plastic prefabricated part to obtain a machined part; adopt drilling tool to be in form the through-hole on the machined part, obtain the structure, wherein the through-hole intercommunication the plastic prefab with the sclerosis layer, the plastic prefab extremely the direction on sclerosis layer does drilling tool's direction of feed. The preparation method is simple, convenient to operate, capable of avoiding burrs and beneficial to use of structural parts. The application also provides an electronic device.

Description

Method for manufacturing structural member and electronic device

Technical Field

The application belongs to the technical field of electronic products, and particularly relates to a manufacturing method of a structural member and electronic equipment.

Background

The plastic material has good flexibility, light weight, easy processing and high cost performance, and is widely used in structural members of electronic equipment, but a large amount of burrs are generated when a through hole is drilled in a plastic material product, so that the use of the plastic material product is influenced. Although there are many methods for removing burrs, the process of removing burrs significantly increases the manufacturing cost, which is not suitable for the wide application of plastic products.

Disclosure of Invention

In view of this, the present application provides a method for manufacturing a structural member and an electronic device.

In a first aspect, the present application provides a method of making a structural member, comprising: forming a hardened layer on the surface of the plastic prefabricated part to obtain a machined part; adopt drilling tool to be in form the through-hole on the machined part, obtain the structure, wherein the through-hole intercommunication the plastic prefab with the sclerosis layer, the plastic prefab extremely the direction on sclerosis layer does drilling tool's direction of feed.

In a second aspect, the present application provides an electronic device including the structural component manufactured by the manufacturing method of the first aspect.

The application provides a preparation method of structure, wherein the sclerosis layer that sets up on plastic prefab surface can play the effect of stiffened and strengthening to resist the cutting force that drilling tool produced in the course of working, avoided the production of burr, solve the problem that the structure produced the burr in the preparation process from the root, and this preparation method is simple, and convenient operation has avoided the process of getting rid of the burr, has saved process flow and cost of manufacture, is favorable to the direct use of structure in electronic equipment.

Drawings

In order to more clearly explain the technical solution in the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be described below.

Fig. 1 is a schematic diagram illustrating a through hole formed in a plastic part according to the prior art.

Fig. 2 is a schematic flow chart of a method for manufacturing a structural member according to an embodiment of the present disclosure.

Fig. 3 is a schematic cross-sectional view of a workpiece according to an embodiment of the present application.

Fig. 4 is a schematic cross-sectional view of a structural member provided in accordance with an embodiment of the present application.

Fig. 5 is a top view of a structural member provided in accordance with an embodiment of the present application.

Fig. 6 is a schematic flow chart of a method for manufacturing a structural component according to another embodiment of the present disclosure.

Fig. 7 is a schematic flow chart illustrating a method for manufacturing a structural member according to another embodiment of the present disclosure.

Fig. 8 is a schematic cross-sectional view of a plastic preform according to an embodiment of the present disclosure.

Fig. 9 is a schematic cross-sectional view of a workpiece provided in another embodiment of the present application.

Fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Fig. 11 is a schematic structural diagram of an electronic device according to another embodiment of the present application.

Fig. 12 is a schematic structural diagram of a touch screen decoration according to an embodiment of the present application.

Fig. 13 is a schematic view of a structural member obtained in example 1.

Fig. 14 is a schematic view of a structural member produced in comparative example 1.

Detailed Description

The following is a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications are also considered as the protection scope of the present application.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Further, the present application may repeat reference numerals and/or reference letters in the various examples for simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or arrangements discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1, which is a schematic view illustrating a through hole formed in a plastic part according to the prior art, wherein a drilling tool 20 is used to machine a plastic part 10, and a direction from top to bottom in fig. 1 is a machining direction of the drilling tool 20, and since the plastic part 10 is made of a polymeric long-chain material, the polymeric long-chain material is taken out by a cutting force generated by high-speed rotation of the drilling tool 20 during a drilling process, and a thread-like substance is generated, thereby forming burrs. In the related art, the burr can be removed by a special chamfering tool, but the preparation cost is obviously increased, the plastic part is required to have high strength to ensure the processing precision, and meanwhile, the special chamfering tool is not suitable for removing the burr in the small plastic part; the burrs can be removed by blowing dry ice, but in order to prevent the appearance effect layer from being additionally arranged on the inner wall of the through hole, the appearance effect layer is usually formed firstly, then the through hole is formed, and the dry ice can damage the appearance effect layer to a certain extent; the burrs can be removed in a burning mode, but the shape structure and the strength of the plastic part are affected; or the burrs are removed by manual operation, so that the preparation cost is greatly improved, and the preparation efficiency is also reduced; even can be through the mode of mould pore-forming, through the setting to the mould surface when shaping plastic part, make the plastic part that has the through-hole, but the meticulous degree of mould shaping through-hole is not high.

Therefore, the present application provides a method for manufacturing a structural member, please refer to fig. 2, which is a schematic flow chart of a method for manufacturing a structural member according to an embodiment of the present application, including:

s101: and forming a hardened layer on the surface of the plastic prefabricated part to obtain a machined part.

S102: and forming a through hole on the machined part by using a drilling tool to obtain a structural part, wherein the through hole is communicated with the plastic prefabricated part and the hardened layer, and the direction from the plastic prefabricated part to the hardened layer is the feeding direction of the drilling tool.

The hardening layer arranged in the application can play a role in hardening and strengthening, and can overcome cutting force generated by high-speed rotation of the drilling tool in the drilling process, so that a polymerized long chain is prevented from being brought out by the drilling tool, burrs cannot be generated, and the problem of removing the burrs is fundamentally solved; as the burr is not generated in the process of forming the through hole, the operation of removing the burr is not needed, the preparation process is reduced, the preparation cost is reduced, and the use of the structural member is facilitated.

In S101, a hardened layer is provided on the surface of the plastic preform, thereby achieving the effect of hardening and strengthening.

In the embodiment of the present application, the material of the plastic preform includes a plastic material. In an embodiment of the present application, the mass content of the plastic material in the plastic preform is greater than or equal to 70%. Therefore, the structural strength of the plastic prefabricated part can be improved, and the use of the structural part in electronic equipment is facilitated. Furthermore, the mass content of the plastic material in the plastic prefabricated part is 70-99%, 72-90%, 75-88% or 70-85%. Specifically, the mass content of the plastic material in the plastic preform may be, but is not limited to, 70%, 72%, 75%, 80%, 83%, 85%, 87%, 90%, 91%, 94%, 96%, 98%, or the like. In one embodiment, the plastic material comprises at least one of polycarbonate, polymethylmethacrylate, polyurethane, and polyamide. The plastic material is beneficial to improving the structural strength of the plastic prefabricated part. Specifically, the plastic preform may be a polycarbonate preform, a polymethyl methacrylate preform, or a preform in which a polycarbonate layer and a polymethyl methacrylate layer are stacked.

In another embodiment of the present application, the plastic preform further includes a reinforcing material. The mechanical property of the plastic prefabricated part is obviously improved by adding the reinforcing material. Furthermore, the mass content of the reinforcing material in the plastic prefabricated part is less than or equal to 30 percent. Therefore, the strength of the plastic prefabricated part can be improved, and the flexibility of the plastic prefabricated part can not be influenced. Furthermore, the mass content of the reinforcing material in the plastic prefabricated part is 1-30%, 10-28%, 12-25% or 15-30% and the like. Specifically, the mass content of the reinforcing material in the plastic preform may be, but is not limited to, 2%, 4%, 6%, 9%, 13%, 15%, 17%, 20%, 25%, 28%, 30%, or the like. In an embodiment, the reinforcement material comprises a fibrous reinforcement material. In particular, the fibrous reinforcement may include, but is not limited to, glass fibers, carbon fibers, and the like. Among the correlation technique, the plastic prefab contains fibre reinforced material, because fibre reinforced material is rectangular chain form structure, appears the burr more easily at the shaping through-hole in-process, and through the sclerosis layer that sets up in this application, even the plastic prefab contains fibre reinforced material, also can avoid the appearance of burr equally, and then helps the promotion of plastic prefab self intensity. In one embodiment, the plastic preform is made of a plastic material and a reinforcing material, wherein the reinforcing material is 9% by mass, and the reinforcing material is glass fiber.

In this application, there is not special restriction to the size of plastic prefab, as long as set up the sclerosis layer on the surface of plastic prefab, all can play the effect of avoiding the burr to produce. In an embodiment of the present application, the plastic preform has a thickness of less than or equal to 0.7mm. For thinner plastic prefabricated parts, the method of chamfering, dry ice hole blowing and burning is adopted to remove burrs, so that the structural strength of the plastic prefabricated parts can be further reduced, the plastic prefabricated parts are not beneficial to use in electronic equipment, and although the method of manually removing the burrs cannot influence the strength of the plastic prefabricated parts, the burr removing efficiency is reduced by times due to the reduction of the thickness, and the preparation efficiency is seriously influenced; and the mode that sets up the sclerosis layer that this application provided neither can cause the influence to the intensity of plastic prefab, has also guaranteed preparation efficiency simultaneously, has avoided the operation of deburring simultaneously, raises the efficiency and reduces the preparation cost, more is favorable to the preparation and the application of miniature structure. Furthermore, the thickness of the plastic prefabricated part is 0.1mm-0.7mm. Still further, the thickness of the plastic preform may be 0.1mm to 0.2mm, 0.2mm to 0.3mm, 0.3mm to 0.4mm, 0.4mm to 0.5mm, 0.5mm to 0.6mm, or 0.6mm to 0.7mm, and in an embodiment of the present application, the width of the plastic preform is less than or equal to 5mm. Thus, the plastic prefabricated member has a small size, and a small-sized structural member can be obtained. The preparation method of the structural part provided by the application has no special requirements on the size of the plastic prefabricated part, namely, the size of the structural part has no special requirements, and the preparation method can be suitable for preparing structural parts with larger sizes and also suitable for preparing structural parts with smaller sizes.

In the embodiment of the present application, the hardness of the hardened layer is 1H or more. Through setting up the sclerosis layer of above-mentioned hardness, can further resist the drilling cutter at the cutting force of shaping through-hole in-process high-speed rotatory production, so can further avoid the production of burr, improve the preparation yield. Specifically, the hardness of the hardened layer may be, but is not limited to, 1H, 2H, 3H, 4H, or the like. In one embodiment, the hardness of the hardened layer is 1H-2H. Furthermore, the mass content of the plastic material in the plastic prefabricated part is more than or equal to 70%, the mass content of the reinforcing material is less than or equal to 30%, and burrs can be avoided in the process of forming the through hole by setting the hardness of the hardened layer to be 1H-2H.

In the embodiment of the present application, the thickness of the hardened layer is 0.02mm to 0.04mm. Through setting up the sclerosis layer of above-mentioned thickness, can further avoid the production of burr, improve the preparation yield to when stiffened, reinforceing the plastic prefab, avoid producing too much influence to the performance of plastic prefab, guarantee the use of structure, still reduced the preparation cost. Specifically, the thickness of the hardened layer may be, but is not limited to, 0.02mm, 0.025mm, 0.028mm, 0.03mm, 0.033mm, 0.035mm, 0.037mm, 0.04mm, or the like.

In the embodiment of the application, the hardened layer is a transparent layer, so that the appearance effect of the structural member is not influenced, and the hardened layer is not required to be removed through an additional process. In one embodiment of the present application, the visible light transmittance of the hardened layer is greater than or equal to 80%. Specifically, the visible light transmittance of the hardened layer may be, but is not limited to, 80%, 85%, 87%, 90%, 92%, 95%, 97%, or the like.

Referring to fig. 3, a cross-sectional view of a workpiece according to an embodiment of the present disclosure is shown, in which the workpiece 50 includes a plastic preform 30 and a hardened layer 40 disposed on a surface of the plastic preform 30. In one embodiment of the present disclosure, a hardening liquid is coated on the surface of the plastic preform 30 and cured to form the hardened layer 40. Through the surface molding sclerosis layer 40 at plastic prefab 30, can improve the cohesion between plastic prefab 30 and the sclerosis layer 40, avoid making plastic prefab 30 and sclerosis layer 40 separation at shaping through-hole in-process cutting force. Specifically, the hardening liquid can be UV paint or spraying liquid; as can be appreciated, it is possible to understand,the hardened layer 40 does not generate burrs during the formation of the through-hole. In one embodiment of the present application, the hardening liquid includes a photocurable resin, a reactive diluent, and a photoinitiator. Wherein, the photoinitiator generates free radicals under the condition of illumination, promotes the combination and crosslinking of the light-cured resin and the reactive diluent, and leads the curing liquid to be cured to form the curing layer 40. In one embodiment, the mass content of the light-curable resin in the hardening liquid may be 45% to 60%. Specifically, the mass content of the photocurable resin in the hardening liquid may be, but is not limited to, 45%, 50%, 55%, 60%, or the like. Further, the mass content of the light-cured resin in the hardening liquid can be 45-49%, 50.2-54.7% or 56.8-59.7%. Specifically, the light curing resin may include at least one of acrylic resin and polyurethane. In one embodiment, the mass content of the reactive diluent in the hardening liquid may be 10% to 20%. Specifically, the mass content of the reactive diluent in the hardening liquid may be, but is not limited to, 10%, 13%, 15%, 18%, 20%, or the like. Furthermore, the mass content of the reactive diluent in the hardening liquid can be 10-12.5%, 13-16% or 15-19%. Specifically, the reactive diluent may include, but is not limited to, dipentaerythritol hexaacrylate, 1, 6-hexanediol diacrylate, pentaerythritol triacrylate, and the like. In one embodiment, the photoinitiator may be present in the hardening liquid in an amount of 1% to 5% by mass. Specifically, the mass content of the photoinitiator in the curing liquid may be, but not limited to, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or the like. Further, the mass content of the photoinitiator in the hardening liquid can be 1% -3%, 2% -4% or 3% -5% and the like. Specifically, the photoinitiator may include, but is not limited to, diphenyl- (2, 4, 6-trimethylbenzoyl) oxyphosphorus (TPO), 1-hydroxycyclohexyl phenyl ketone (photoinitiator 184), benzophenone (BP), 2-hydroxy-4- (2-hydroxyethoxy) -2-methylpropiophenone (photoinitiator 2959), and the like. In one embodiment, the hardening fluid further comprises an auxiliary agent and a solvent. Specifically, the auxiliary agent may include at least one of a leveling agent, a light stabilizer, a defoaming agent, and a dispersing agent, and the solvent may include at least one of butyl acetate, ethyl acetate, isobutanol, propylene glycol methyl ether acetate, and propylene glycol methyl ether. In another embodiment of the present application, hardeningWhen the liquid contains a photoinitiator, curing is performed by light irradiation. Further, when the hardening liquid contains an ultraviolet light initiator, the hardening liquid is cured by ultraviolet light irradiation. For example, the curing may be performed by an LED lamp, or may be performed by a mercury lamp. Specifically, the curing energy of the LED lamp can be 1300mj/cm ² -1500mj/cm ² The curing energy of the mercury lamp can be 900mj/cm ² -1100mj/cm ² . It is understood that the hardened layer 40 can be adhered to the surface of the plastic preform 30 to form the workpiece 50, thereby providing efficiency in manufacturing the workpiece 50. For example, a polyethylene terephthalate film may be bonded to the surface of the plastic preform 30 to form the workpiece 50.

In S102, a through hole is formed by a drilling tool to obtain a structural member. Wherein, the feed direction of the drilling tool is the direction from the plastic prefabricated part 30 to the hardened layer 40, and the feed direction is the moving direction of the drilling tool; that is, the drilling tool contacts the plastic preform 30 first, and forms a through hole in the plastic preform 30, then contacts the hardened layer 40, and then forms a through hole in the hardened layer 40, thereby forming a through hole, so that the hardened layer 40 can overcome the cutting force while forming the through hole, and thus prevent the generation of burrs. As shown in fig. 3, the direction indicated by the arrow is the feed direction of the drilling tool. In the present application, the size of the drilling tool is selected according to the size of the through-hole, and the drilling tool may be, but is not limited to, a drill or the like.

In the present embodiment, the rotation speed of the drilling tool is 2 × 10 ⁴ rpm-2.4×10 ⁴ rpm. By adopting the rotating speed, the forming efficiency of the through hole can be improved, the generation of burrs can be further avoided, and the preparation yield is improved. In particular, the rotation speed of the drilling tool may be, but is not limited to, 2 × 10 ⁴ rpm、2.1×10 ⁴ rpm、2.2×10 ⁴ rpm、2.3×10 ⁴ rpm or 2.4X 10 ⁴ rpm, etc.

Referring to fig. 4 and 5, a cross-sectional view and a top view of a structural member according to an embodiment of the present application are shown, wherein the structural member 60 is different from the workpiece 50 in that the structural member 60 has a through hole 61. In the present application, the opening shape of the through hole 61 may be, but is not limited to, a circle, an ellipse, a oval, a polygon, an irregular shape, etc., and the through hole 61 may be, but is not limited to, a right cylinder (e.g., a right cylinder, a right prism, etc.) or an oblique cylinder (e.g., an oblique cylinder, an oblique prism, etc.). In the present embodiment, the through-hole 61 has a lateral dimension of 0.5mm to 1.2mm. The lateral dimension of the through-hole 61 is the dimension of the opening of the through-hole 61. Specifically, the transverse dimension of the through hole 61 may be, but is not limited to, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, or the like. The manufacturing method of the structural member 60 provided by the application can obtain the through hole 61 with a smaller size, and meanwhile, the generation of burrs can be avoided. In one embodiment, the opening of the through hole 61 is in a shape of a kidney circle, and the length and the width of the opening of the through hole 61 are 0.8mm and 0.6mm, respectively.

Referring to fig. 6, a schematic flow chart of a method for manufacturing a structural member according to another embodiment of the present application is shown, including:

s201: and forming a hardened layer on the surface of the plastic prefabricated part to obtain a machined part.

S202: the utility model provides a numerical control machine tool, numerical control machine tool include cutter fixture and workstation, install drilling tool on cutter fixture, arrange the workstation in with the machined part on, adopt drilling tool to form the through-hole on the machined part, obtain the structure, wherein through-hole intercommunication plastic prefab and sclerosis layer, the direction of plastic prefab to the sclerosis layer is drilling tool's feed direction.

For S201, reference may be made to the description in S101, which is not described herein again.

In S202, the drilling tool and the workpiece 50 are placed in the numerical control machine, and the forming of the through hole 61 is controlled by the program of the numerical control machine, so that the process is more automated and more suitable for the process production of the structural member 60. Specifically, the workpiece 50 may be processed using, but not limited to, a drilling tool in a CNC (computer numerical control) process to obtain the structural member 60. It will be appreciated that the through-hole 61 may also be formed by other means in conjunction with a drilling tool, such as a drill or the like.

Referring to fig. 7, a schematic flow chart of a method for manufacturing a structural member according to another embodiment of the present application includes:

s301: and forming a hardened layer in the groove to obtain the machined part.

S302: and forming a through hole on the machined part by using a drilling tool to obtain a structural part, wherein the through hole is communicated with the plastic prefabricated part and the hardened layer, and the direction from the plastic prefabricated part to the hardened layer is the feeding direction of the drilling tool.

For S302, reference may be made to the description in S102, which is not described herein again.

In S301, the setting of the hardened layer 40 is facilitated by providing the groove; for example, when the hardening liquid is applied, the hardening liquid may be confined in the grooves, and affect the surface of the plastic preform 30 in other areas. Please refer to fig. 8, which is a schematic cross-sectional view of a plastic preform according to an embodiment of the present disclosure, wherein the plastic preform 30 has a groove 31; referring to fig. 9, a cross-sectional view of a workpiece according to another embodiment of the present application is shown, wherein a hardened layer 40 of the workpiece 50 is disposed in a groove 31 of a plastic preform 30. In the present embodiment, the depth of the groove 31 is greater than the thickness of the hardened layer 40; in this manner, the setting of the hardened layer 40 is facilitated. Further, the depth of the groove 31 is more than 0.05mm. Specifically, the depth of the groove 31 may be, but is not limited to, 0.06mm to 0.1mm.

In the application, the hardened layer 40 is arranged on the surface of the plastic prefabricated part 30, and the hardened layer 40 can overcome cutting force generated by a drilling tool when the through hole 61 is formed, so that burrs are avoided, the problem of burr generation during machining is solved fundamentally, the operation of removing the burrs is avoided, the original appearance effect is kept, and the use of the structural part 60 is facilitated; at the same time, the remaining hardened layer 40 in the structural member 60 does not need to be removed additionally.

The present application also provides a structural member 60 made by the method of any of the embodiments described above.

The present application also provides an electronic device comprising the above-described structural member 60. Electronic equipment as used herein includes, but is not limited to, devices that are configured to receive/transmit communication signals via a wireline connection (e.g., via a public switched telephone network, a digital subscriber line, a digital cable, a direct cable connection, and/or another data connection/network) and/or via a wireless interface (e.g., for a cellular network, a wireless local area network, a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter, and/or another communication terminal). A communication terminal arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", a "wireless terminal", an "electronic apparatus", and/or an "electronic device". Examples of electronic device 100 include, but are not limited to, a satellite or cellular telephone; a personal communication system terminal that can combine a cellular radiotelephone with data processing, facsimile and data communication capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, web browsers, notepads, calendars, and/or global positioning system receivers; and conventional laptop and/or palmtop receivers, gaming machines, smart bracelets, smart watches, smart glasses, or other electronic devices that include a radiotelephone transceiver. The structural member 60 may be, but is not limited to, a front cover, a rear cover, a middle frame, a touch screen decoration, a temple, a frame, a key, a dial, etc. of the electronic device.

Referring to fig. 10, a schematic structural diagram of an electronic device according to an embodiment of the present disclosure is shown, where the electronic device 100 is a pair of smart glasses, and the pair of smart glasses may be, but is not limited to, augmented Reality (AR) glasses. In one embodiment, the smart glasses include a frame 101 and a temple 102 connected to the frame 101. The structural member 60 may be a frame 101 or a temple 102. Specifically, the frame 101 or the temple 102 is formed of the structural member 60, and electronic components such as an optical device and a sensor can be fixed to the through hole 61 of the structural member 60.

Please refer to fig. 11, which is a schematic structural diagram of an electronic device according to another embodiment of the present application, wherein the electronic device 100 is a folding screen mobile phone. Specifically, the folding screen mobile phone may be, but not limited to, a flip folding screen mobile phone, a half-folding screen mobile phone, a sliding folding screen mobile phone, or a scroll folding screen mobile phone. In one embodiment, a folding screen handset includes a display screen 103 and a touch screen trim 104 disposed about the display screen 103. Referring to fig. 12, a schematic structural diagram of a touch screen decoration according to an embodiment of the present disclosure is shown, in which the structural member 60 may serve as a touch screen decoration 104. Specifically, by using the structural member 60 as the touch panel decoration 104, a receiver, a microphone, and the like can be disposed in the folding screen mobile phone corresponding to the through hole 61 of the structural member 60, so as to facilitate sound transmission and the like.

The preparation process provided in this application is further illustrated by the following specific examples.

Example 1

Providing a plastic prefabricated part, wherein the plastic prefabricated part comprises 80% by mass of polycarbonate and 20% by mass of glass fiber, and the thickness of the plastic prefabricated part is 0.5mm. And spraying UV paint on the surface of the plastic prefabricated part, and curing to form a hardened layer with the surface hardness of 1H to obtain the machined part.

Adopting a single-shaft CNC machine table, matching with a drilling tool, and the processing rotating speed is 2 multiplied by 10 ⁴ rpm, drilling tool's directness is 0.4mm, forms a plurality of through-holes on the machined part, through-hole intercommunication plastic prefab and sclerosis layer, and the direction of plastic prefab to sclerosis layer is drilling tool's feed direction, and the opening of through-hole is oval, and length is 0.8mm, and the width is 0.6mm, makes the structure. As shown in fig. 13, which is a schematic view of the structural member obtained in example 1, no burr was generated at the through-hole in the structural member, the edge of the through-hole was smooth, and the structural member was directly used.

Example 2

Providing a plastic prefabricated part, wherein the plastic prefabricated part comprises 91% of polycarbonate by mass and 9% of glass fiber by mass, and the plastic prefabricated part is 0.52mm in thickness and 3.56mm in width. And spraying UV paint on the surface of the plastic prefabricated part, curing to form a hardened layer, wherein the surface hardness is 2H, and the thickness of the hardened layer is 0.03mm, so as to obtain the machined part.

The drilling tool forms a plurality of through holes on the workpiece, and the rotation speed of the drilling tool is 2.2 multiplied by 10 ⁴ rpm, the through hole communicates the plastic prefabricated member and the hardened layer, the direction from the plastic prefabricated member to the hardened layer is the feed direction of the drilling tool, the opening of the through hole is circular, the diameter of the through hole is 0.8mm, and a structural member is prepared, wherein the through hole is arranged in the structural memberNo burr is generated, the edge of the through hole is smooth, and the structural part can be directly used.

Comparative example 1

The difference from embodiment 1 is that no hardened layer is provided; as shown in fig. 14, which is a schematic view of the structural member manufactured in comparative example 1, the through hole of the structural member is burred and conspicuous, and an operation for removing the bur is required.

Comparative example 2

The difference from example 2 is that no hardened layer was provided, and the resulting structural member had a large number of burrs and an operation for removing the burrs was required.

Therefore, the preparation method of the structural member fundamentally avoids the generation of burrs, thereby improving the processing effect of the structural member, avoiding the deburring operation, improving the preparation efficiency, reducing the preparation cost, and being beneficial to the industrial production and large-scale use of the structural member.

The foregoing detailed description has provided for the embodiments of the present application, and the principles and embodiments of the present application have been presented herein for purposes of illustration and description only and to facilitate understanding of the methods and their core concepts; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A method of making a structural member, comprising:

forming a hardened layer on the surface of the plastic prefabricated part to obtain a machined part;

adopt drilling cutter to be in form the through-hole on the machined part, obtain the structure, wherein the through-hole intercommunication the plastic prefab with the sclerosis layer, the plastic prefab extremely the direction on sclerosis layer does the direction of feed of drilling cutter.

2. The production method according to claim 1, wherein the hardness of the hardened layer is 1H or more.

3. The production method according to claim 1, wherein the thickness of the hardened layer is 0.02mm to 0.04mm.

4. The method of claim 1, wherein the drilling tool is rotated at a speed of 2 x 10 ⁴ rpm-2.4×10 ⁴ rpm。

5. The method for preparing according to claim 1, wherein the forming of the through-hole in the workpiece using the drilling tool includes: providing a numerical control machine tool, wherein the numerical control machine tool comprises a cutter clamping mechanism and a workbench; will the drilling tool is installed cutter fixture is last and will the machined part is arranged in on the workstation, adopt the drilling tool is in form the through-hole on the machined part.

6. The method according to claim 1, wherein the surface of the plastic preform has a groove, and the hardened layer is disposed in the groove.

7. The method of claim 6, wherein the depth of the groove is greater than 0.05mm.

8. The method according to claim 1, wherein the plastic preform has a thickness of less than or equal to 0.7mm; the transverse dimension of the through hole is 0.5mm-1.2mm.

9. The method according to claim 1, wherein the forming of the hardened layer on the surface of the plastic preform comprises:

the surface coating hardening liquid of plastic prefab forms after the solidification hardening layer, wherein the hardening liquid includes photocuring resin, active diluent and photoinitiator.

10. An electronic device comprising the structural member obtained by the production method according to any one of claims 1 to 9.