CN107718425B - Metal insert injection molding method, metal insert injection molding product and electronic equipment - Google Patents

Abstract

The embodiment of the application discloses metal insert injection moulding's method, metal insert injection moulding and electronic equipment, in the method, put into plastic mould with the metal insert, wherein the screw hole outer wall of metal insert coats and is stamped the barrier layer, then pours into the plastic material in order to form the working of plastics, removes the barrier layer again to form the breach between the screw hole outer wall of metal insert and the working of plastics, through above-mentioned mode, this application can reduce the probability that the screw hole of metal insert produced the deformation.

Description

Metal insert injection molding method, metal insert injection product and electronic equipment

technical field

The present application relates to the field of electronic technology, and in particular to a metal insert injection molding method, a metal insert injection molded product, and electronic equipment.

Background technique

The metal insert injection molding process is mainly to place the metal insert as an injection insert in the mold in advance, and then inject plastic into the mold and solidify and cool, so that the metal insert and the plastic form a whole, and the metal insert injection product is obtained. Metal insert injection molding products are widely used. For example, the metal insert injection molding process is also used in the production of electronic handheld device housings, which can save metal resources and improve the strength of plastic parts.

In the prior art, the metal inserts are often provided with threaded holes, and the hole walls of the threaded holes are thinner than other parts. Deformation occurs under the impact, so that the screw cannot be driven into the threaded hole in the subsequent process, resulting in low product yield.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a metal insert injection molding method, a metal insert injection product, and an electronic device, which can reduce the probability of deformation of threaded holes in the metal insert, and help improve product yield.

Embodiments of the present application provide a method for injection molding of metal inserts, including:

providing a metal insert, the metal insert is provided with a threaded hole;

providing a plastic mold, and placing the metal insert into the plastic mold, wherein at least part of the outer wall of the threaded hole is covered with a barrier layer;

injecting plastic material into the plastic mold to form a plastic part combined with the metal insert;

The barrier layer is removed so that a gap is formed between at least part of the outer wall of the threaded hole and the plastic part.

The embodiment of the present application further provides a metal insert injection molded product, and the metal insert injection molded product is manufactured by the above-mentioned metal insert injection molding method.

The embodiment of the present application further provides a metal insert injection molding product, including a metal insert and a plastic part, the metal insert and the plastic part are fixedly connected by means of injection molding, and the metal insert is provided with a threaded hole, A gap is formed between at least part of the outer wall of the threaded hole and the plastic part.

An embodiment of the present application further provides an electronic device, including a casing, and the casing includes the metal insert injection molded product described above.

In the metal insert injection molding method of the present application, by covering the outer wall of the threaded hole with a barrier layer, in the process of injecting the plastic material into the plastic mold, the barrier layer can reduce the injection pressure during the injection molding process. The impact effect of the threaded hole can reduce the probability of deformation of the threaded hole and improve the product yield.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

FIG. 2 is another schematic structural diagram of an electronic device provided by an embodiment of the present application.

FIG. 3 is a schematic structural diagram of a metal insert provided in an embodiment of the present application.

FIG. 4 is a schematic flowchart of a method for injection molding a metal insert provided by an embodiment of the present application.

FIG. 5 is a schematic diagram of a process of a method for injection molding a metal insert provided by an embodiment of the present application.

FIG. 6 is a schematic diagram of another process of the method for injection molding a metal insert provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc., or The positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as a limitation on this application. In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more of said features. In the description of the present application, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can be mechanical connection, electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction of two elements relation. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In this application, unless otherwise expressly specified and defined, a first feature "on" or "under" a second feature may include direct contact between the first and second features, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the application. Furthermore, this application may repeat reference numerals and/or reference letters in different instances for the purpose of simplicity and clarity, and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, this application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Embodiments of the present application provide a metal insert injection molding method, a metal insert injection product, and an electronic device.

Wherein, the metal insert injection molding product can be specifically set in electronic devices such as mobile phones, tablet computers, PDAs (Personal Digital Assistant, PDA), etc., for example, can be applied to the shell of the electronic device, or applied to the middle frame of the electronic device. ,and many more.

Referring to FIG. 1 , FIG. 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. As shown, the electronic device 100 includes a housing 10, a display screen 20, a printed circuit board 30, a battery 40, and the like.

The casing 10 may include a cover plate 11 , a middle frame 12 and a rear cover 13 . The cover plate 11 , the middle frame 12 and the rear cover 13 are combined with each other to form the casing 10 . 12 and the back cover 13 to form a closed space to accommodate the display screen 20, the printed circuit board 30, the battery 40 and other devices. In some embodiments, the cover 11 is covered on the middle frame 12 , the rear cover 13 is covered on the middle frame 12 , the cover 11 and the rear cover 13 are located on the opposite sides of the middle frame 12 , the cover 11 and the rear cover 13 Relatively arranged, the closed space of the housing 10 is located between the cover plate 11 and the rear cover 13 .

In the embodiment of the present application, the casing 10 may be, for example, a casing structure in which metal and plastic cooperate with each other. For example, components such as the printed circuit board 30 need to be mounted on the middle frame 12 of the casing 10 by screws. Therefore, the middle frame 12 It can be a metal insert injection molding product, that is, a metal shell with threaded holes can be used as an insert, and it can be injection molded in a plastic mold to form a middle frame structure in which metal and plastic cooperate with each other, which is used to install printed circuit boards. The screws of the 30 can be matched with the threaded holes on the metal insert to install the printed circuit board 30 on the middle frame 12 . For another example, the back cover 13 of the housing 10 may also adopt a back cover structure in which metal and plastic cooperate with each other according to actual needs. The cover plate 11 may be a transparent glass cover plate. In some embodiments, the cover plate 11 may be a glass cover plate made of a material such as sapphire.

It should be noted that the structure of the housing in the embodiment of the present application is not limited to this. For example, the rear cover and the middle frame are integrally formed to form a middle frame structure. Specifically, the housing 10 includes a cover plate 11 and a middle frame 12, and the cover plate 11 and the middle frame 12 are fixed to each other to form a closed space for accommodating the display screen 20, the printed circuit board 30, the battery 40 and other devices.

Wherein, the printed circuit board 30 is installed in the housing 10, the printed circuit board 30 can be the main board of the electronic device 1, and the printed circuit board 30 can be integrated with a motor, a microphone, a camera, a light sensor, a receiver and a processing unit. device and other functional components.

In some embodiments, the printed circuit board 30 is fixed within the housing 10 . Specifically, the printed circuit board 30 can be screwed to the middle frame 12 by screws, or can be snap-fitted to the middle frame 12 by means of snaps. It should be noted that, the specific way of fixing the printed circuit board 30 to the middle frame 12 in the embodiment of the present application is not limited to this, and other ways, such as a way of co-fixing by a buckle and a screw, is also possible.

The battery 40 is installed in the casing 10 , and the battery 40 is electrically connected to the printed circuit board 30 to provide power to the electronic device 100 . The case 10 may serve as a battery cover for the battery 40 . The casing 10 covers the battery 40 to protect the battery 40 , specifically, the back cover covers the battery 40 to protect the battery 40 and reduce damage to the battery 40 due to collision, drop, etc. of the electronic device 100 .

The display screen 20 is installed in the casing 10 , and at the same time, the display screen 20 is electrically connected to the printed circuit board 30 to form a display surface of the electronic device 100 . The display screen 20 includes a display area 201 and a non-display area 202 . The display area 201 may be used to display the screen of the electronic device 100 or for the user to perform touch manipulation or the like. The top area of the non-display area 202 is provided with openings for sound and light transmission. The bottom of the non-display area 202 can be provided with functional components such as fingerprint modules and touch buttons. The cover plate 11 is mounted on the display screen 20 to cover the display screen 20 to form the same display area and non-display area as the display screen 20 . For details, please refer to the display area and non-display area of the display screen 20 .

It should be noted that the structure of the display screen 20 is not limited to this. For example, the display screen may be a full screen or a heterosexual screen. Specifically, please refer to FIG. 2 , which is another schematic structural diagram of the electronic device provided by the embodiment of the present application. The difference between the electronic device in FIG. 2 and the electronic device in FIG. 1 is that the non-display area is directly formed on the display screen 20, for example, the non-display area of the display screen 20 is set as a transparent structure, so that the light signal can pass through, or By directly opening structures such as openings or gaps for light transmission in the non-display area of the display screen 20, the front camera and photoelectric sensor can be arranged in the non-display area, so that the front camera can take pictures and detect by the photoelectric sensor.

Referring to FIG. 3 , FIG. 3 is a schematic structural diagram of a metal insert injection molded product provided by an embodiment of the present application. Wherein, the metal insert injection product may be, for example, the middle frame 12 of the electronic device 100, or may also be the back cover 13, which is not limited thereto.

Taking the metal insert injection product as the middle frame 12 as an example, the metal insert injection product includes a metal insert 121 and a plastic part 122 fixedly connected with the metal insert 121 . The metal insert 121 and the plastic part 122 can be integrally formed by injection molding. The metal insert 121 can be made of magnesium alloy material, for example, or can also be made of other metal materials. The metal insert 121 is provided with a threaded hole 1211 . A gap 1213 is formed between at least part of the outer wall of the threaded hole 1211 and the plastic part 122. For example, a gap 1213 can be formed between the outer wall corresponding to the hole wall of the threaded hole 1211 whose thickness is less than a threshold value and the plastic part 122. The threshold value can be based on actual needs For setting, that is, a gap 1213 is formed between the outer wall corresponding to the thinner threaded hole wall and the plastic part 122 . The number of threaded holes 1211 can be set according to actual needs, for example, there can be two as shown in FIG. 3 , or three or more, which is not limited.

In the embodiment of the present application, a gap 1213 is formed between the thin hole wall of the threaded hole 1211 and the plastic part 122, that is, there is no plastic coating on the outer wall corresponding to the thin hole wall, so it is not required during the injection molding process. Plastic is injected into the periphery of the outer wall of the threaded hole 1211 , so that the injection pressure of the injection molding process can be prevented from directly acting on the outer wall of the threaded hole 1211 , thereby reducing the probability of deformation of the threaded hole and improving the product yield.

Optionally, the surface of the metal insert 121 connected with the plastic part 122 is coated with an adhesive 1212 for bonding with the plastic part 122 . Therefore, by coating the adhesive 1212 on the metal insert 121, the reliability of the connection between the metal insert 121 and the plastic part 122 can be improved, so that the connection between the two is firmer.

Referring to FIGS. 4 and 5 , FIG. 4 is a schematic flowchart of a method for injection molding a metal insert provided by an embodiment of the present application, and FIG. 5 is a schematic diagram of a manufacturing process of the method for injection molding a metal insert provided by an embodiment of the present application. The metal insert injection molding method of the embodiment of the present application is used to form a metal insert injection molding product as shown in FIG. 3 , wherein FIG. 5 only schematically shows part of the structure of the metal insert and part of the structure of the plastic part, It is not intended as a structural limitation on the metal inserts and plastic parts of the embodiments of the present application. As shown in the figure, it includes the following steps:

In step 401, a metal insert 121 is provided, and the metal insert 121 is provided with a threaded hole 1211. The metal insert 121 can be, for example, made of aluminum alloy material, or made of other metal materials.

In step 402, a plastic mold B is provided, and the metal insert 121 is put into the plastic mold B, wherein at least part of the outer wall of the threaded hole is covered with the barrier layer A.

For example, the barrier layer A may be provided on the metal insert 121. Specifically, providing the metal insert specifically includes: disposing the barrier layer A on at least part of the outer wall of the threaded hole 1211 of the metal insert 121, so that the barrier layer A covers the thread At least part of the outer wall of the hole 1211 . Wherein, the barrier layer A can be made of plastic material or metal material, can be integrally formed with the metal insert, or can be formed separately. In a possible implementation manner, the barrier layer A is integrally formed with the metal insert 121. Specifically, disposing the barrier layer A on at least part of the outer wall of the threaded hole of the metal insert 121 may include: forming an integral body by means of injection molding Formed metal insert 121 and barrier layer A. That is, in the embodiment, the barrier layer A is formed by extending outward from the outer wall of the screw hole 1211 of the metal insert 121 .

In other embodiments, the barrier layer may also be formed separately, for example, the barrier layer may be provided according to the shape and size of the outer wall of the threaded hole, so that the barrier layer conforms to the outer wall of the threaded hole. Wherein, the barrier layer can be fixed on at least part of the outer wall of the threaded hole by means of bonding.

Among them, the outer wall of the threaded hole can be all the outer wall around the threaded hole, or can surround a part of the outer wall around the threaded hole, which can be selected according to the thickness of the hole wall in different parts of the threaded hole, for example, a thicker hole wall has a higher hardness , it is not easy to deform and can withstand the injection pressure, so it is not necessary to set a barrier layer, and the thinner hole wall has less hardness and is prone to deformation, so a barrier layer can be set on the outer wall corresponding to the thinner threaded hole wall, specifically , a barrier layer can be covered on the outer wall corresponding to the threaded hole wall with a thickness smaller than a threshold value, and the threshold value can be set according to actual needs.

In step 403 , the plastic material is injected into the plastic mold B to form the plastic part 122 combined with the metal insert 121 .

The plastic material is injected into the plastic mold B, and then the plastic material is cured through a curing process to form the plastic part 122 , and the plastic part and the metal insert are combined together to obtain a metal insert injection molded product.

In a possible implementation manner, before step 403, the method may further include: inserting a suitable bolt into the threaded hole. By inserting bolts matching the threaded holes into the threaded holes, the threaded holes are filled with bolts, thereby further reducing the probability of deformation of the threaded holes during the injection molding process. Wherein, after the plastic material is injected into the plastic mold B, the method further includes: pulling out the bolt from the threaded hole.

In step 404 , the barrier layer A is removed, so that a gap 1213 is formed between at least part of the outer wall of the threaded hole 1211 and the plastic part 122 .

For example, the blocking layer can be removed by milling or etching, so that a gap 1213 is formed between the outer wall of the threaded hole 1211 and the plastic part 122 . The barrier layer A may be removed after the plastic mold B is separated from the metal insert 121 and the plastic component, or the plastic mold B may be separated from the metal insert 121 and the plastic component 122 after the barrier layer A is removed.

According to the embodiment of the present application, during the injection molding process of the metal insert, a barrier layer is provided on the outer wall of the threaded hole, and the impact of the injection pressure in the injection molding process on the hole wall of the threaded hole can be reduced through the action of the barrier layer, thereby enabling Reduces the chance of deformation of threaded holes on metal inserts and increases product yield.

In some possible embodiments, before the plastic material is injected into the plastic mold, the following step may be further included: coating an adhesive on the surface of the metal insert connected to the plastic part, so as to bond with the plastic part. Therefore, by coating the surface of the metal insert with an adhesive, the reliability of the connection between the plastic part and the metal insert can be improved.

Referring to FIG. 6 , FIG. 6 is a schematic diagram of a manufacturing process of a method for injection molding a metal insert provided by another embodiment of the present application. The metal insert injection molding method of the embodiment of the present application is used to form a metal insert injection product as shown in FIG. 3 , wherein FIG. 6 only schematically shows part of the structure of the metal insert and part of the structure of the plastic part , not as a structural limitation on the metal inserts and plastic parts of the embodiments of the present application. The main difference from the embodiment shown in FIG. 5 is that the barrier layer A of this embodiment is disposed on the plastic module B. As shown in FIG. Specifically, as shown in the figure, a metal insert 121 is provided first, and a threaded hole 1211 is provided on the metal insert 121 . Then, a plastic mold B is provided, and the metal insert 121 is put into the plastic module B, wherein, in the step of providing the plastic mold B, the step of providing the plastic mold B specifically includes: disposing a barrier layer A in the plastic mold B, so that the metal insert 121 is inserted into the plastic mold B. When the component 121 is put into the plastic module B, the barrier layer A covers at least part of the outer wall of the screw hole 1211 .

In some embodiments, the barrier layer A may be integrally formed with the plastic mold B, or may be formed separately, which is not limited. After the metal insert 121 is put into the plastic mold B, the plastic material is injected into the plastic mold B to form the plastic part 122 combined with the metal insert 121 . Then, the plastic mold B is removed, and the barrier layer A is also detached from the metal insert 121 , so that a gap 1213 is formed between the outer wall of the threaded hole 1211 of the metal insert 121 and the plastic part 122 .

Through this embodiment, the use of the barrier layer can reduce the impact of the injection pressure in the injection molding process on the wall of the threaded hole, thereby reducing the probability of deformation of the threaded hole.

A metal insert injection molding method, metal insert injection products and electronic equipment provided by the embodiments of the present application have been described in detail above. The principles and implementations of the present application are described with specific examples in this paper. The description of the embodiment is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, there will be changes in the specific embodiments and application scope. As stated, the contents of this specification should not be construed as limiting the application.

Claims (18)

1. a kind of method of metal insert injection molding characterized by comprising

Metal insert is provided, is provided with threaded hole on the metal insert；

Plastic mould is provided, and the metal insert is put into the plastic mould, wherein in at least portion of the threaded hole Exceptionally barrier layer is covered on wall；

Plastic material is injected in the plastic mould, with the plastic part formed and the metal insert combines；

The barrier layer is removed, so that forming notch between at least partly outer wall and the plastic part of the threaded hole.

2. the method according to claim 1, wherein the offer metal insert, comprising: in metal insert screw thread Barrier layer is set on at least partly outer wall in hole, so that the barrier layer covers at least partly outer wall of the threaded hole.

3. according to the method described in claim 2, it is characterized in that, described on at least partly outer wall of metal insert threaded hole Barrier layer is set, comprising: forms integrally formed metal insert and barrier layer by injection molding manner.

4. according to the method described in claim 3, it is characterized in that, described remove the barrier layer, comprising: pass through milling or erosion Quarter, mode removed the barrier layer.

5. according to the method described in claim 2, it is characterized in that, described on at least partly outer wall of metal insert threaded hole Barrier layer is set, comprising: barrier layer is fixed on at least partly outer wall of the threaded hole by way of bonding.

6. the method according to claim 1, wherein described inject it in the plastic mould for plastic material Before, further includes: it is be bonded to be carried out with plastic part in the surface coating adhesive of the metal insert being connect with plastic part.

7. the method according to claim 1, wherein the offer plastic mould, comprising: in the plastic mould Middle setting barrier layer, so that the barrier layer covers the threaded hole when the metal insert to be put into plastic mould At least partly outer wall.

8. the method according to the description of claim 7 is characterized in that described be arranged barrier layer in the plastic mould, comprising: Integrally formed plastic mould and barrier layer are formed by way of injection molding.

9. method according to claim 1-8, which is characterized in that described in at least partly outer of the threaded hole Barrier layer is covered on wall, comprising: be covered with barrier layer on the corresponding outer wall of screw thread hole wall that thickness is less than threshold value.

10. the method according to claim 1, wherein described inject plastic material in the plastic mould, with It is formed before the plastic part combined with the metal insert, further includes: be inserted into the threaded hole compatible with threaded hole Bolt.

11. a kind of metal insert injection moulded products, which is characterized in that the metal insert injection moulded products are used as claim 1-10 is any The method of the metal insert injection molding of item is made.

12. a kind of metal insert injection moulded products, which is characterized in that including metal insert and plastic part, the metal insert and described Plastic part is fixedly connected by way of injection molding, threaded hole is provided on the metal insert, the threaded hole is at least partly A notch is formed between outer wall and the plastic part；Wherein, the metal insert is used such as any one of claim 1-10 institute The method for the metal insert injection molding stated is made.

13. metal insert injection moulded products according to claim 12, which is characterized in that the metal insert with the plastics The surface of part connection has binder, to Nian Jie with the plastic part.

14. metal insert injection moulded products according to claim 12, which is characterized in that the notch is located at thickness less than threshold value The corresponding outer wall of screw thread hole wall and the plastic part between.

15. metal insert injection moulded products according to claim 12, which is characterized in that during the metal insert injection moulded products are Frame.

16. metal insert injection moulded products according to claim 12, which is characterized in that after the metal insert injection moulded products are Lid.

17. metal insert injection moulded products according to claim 12, which is characterized in that the metal insert uses almag It is made.

18. a kind of electronic equipment, which is characterized in that including shell, the shell includes as described in claim any one of 12-17 Metal insert injection moulded products.