CN108943575B

CN108943575B - Double-material injection molding method and terminal shell

Info

Publication number: CN108943575B
Application number: CN201810687521.7A
Authority: CN
Inventors: 范金林; 肖志强; 孟祥发
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2018-06-28
Filing date: 2018-06-28
Publication date: 2020-07-21
Anticipated expiration: 2038-06-28
Also published as: CN108943575A

Abstract

The disclosure relates to a double-material injection molding method and a terminal shell, and belongs to the technical field of terminals. According to the double-material injection molding method provided by the embodiment of the disclosure, the second forming part is shielded, so that paint is prevented from being sprayed on the second forming part when the first forming part is subjected to paint baking treatment; the pressure is applied to the second forming part to expose part of the contact surface of the first forming part, and the exposed contact surface of the first forming part is subjected to paint baking treatment, so that paint adopted by the paint baking treatment fills the gap between the surface to be colored of the first forming part and the surface to be shielded of the second forming part, and the visual effect of a product comprising the first forming part and the second forming part, namely the terminal shell, is favorably improved.

Description

Double-material injection molding method and terminal shell

Technical Field

The disclosure relates to the technical field of terminals, in particular to a double-material injection molding method and a terminal shell.

Background

In the related art, with the widespread use of terminals such as smart phones and tablet devices, the requirements of users on richness of terminal appearance are increasing. Therefore, how to improve the richness of the color of the terminal housing is becoming a research focus in the technical field.

Disclosure of Invention

In order to overcome the problems in the related art, the embodiments of the present disclosure provide a two-material injection molding method and a terminal housing.

According to a first aspect of the embodiments of the present disclosure, there is provided a two-material injection molding method, including:

performing injection molding on a first type of material to form a first molding part, and performing injection molding on a second type of material to form a second molding part with elasticity on the first molding part; the first forming part is provided with a surface to be colored, the first forming part is provided with a contact surface which is used for being in contact with the second forming part and is connected with the surface to be colored, and the second forming part is provided with a surface to be shielded, which is the same side with the surface to be colored of the first forming part;

shielding the surface to be shielded of the second forming part by a shielding jig, and applying pressure to the surface to be shielded so that the second forming part has a set deformation amount and part of the contact surface of the first forming part is exposed;

and performing paint baking treatment on the exposed part of the contact surface of the first forming part through a spray gun so as to enable the contact surface of the first forming part to have a first target color.

In one possible implementation manner, the injection molding of the first type of material to form a first molding portion and the injection molding of the second type of material to form a second molding portion having elasticity on the first molding portion includes:

performing one-time injection molding on the first type of material to form a first molding part, wherein a glue pulling groove is formed in the first molding part;

and performing secondary injection molding on the second material, and filling part of the second material into the glue pulling groove to form a second elastic molding part on the first molding part.

In one possible implementation manner, before performing the second injection molding on the first molding portion, the method further includes: adding a coloring material to the second type material to enable the second molded part to have a second target color.

In one possible implementation, the set deformation amount is greater than or equal to 0.25 mm and less than or equal to 0.35 mm.

In a possible implementation manner, the distance between the exposed contact surface on the first forming portion and the shielding jig is greater than or equal to 0.08 mm and less than or equal to 0.12 mm.

In one possible implementation, the varnish-baking treatment of the exposed part of the contact surface of the first forming part is performed by a spray gun, and comprises:

setting a spray gun to perform paint baking treatment on a first set area facing to a surface to be colored on a contact surface of the first forming part in a first spraying direction; a first included angle is formed between the first spraying direction and the contact surface;

setting a spray gun to carry out paint baking treatment on a second set area, deviating from the surface to be colored, on the contact surface of the first forming part in a second spraying direction; a second included angle is formed between the second spraying direction and the contact surface;

and the sum of the vector angle formed by the first injection direction and the second injection direction and the first included angle and the second included angle is 180 degrees.

In one possible implementation manner, the first included angle is greater than or equal to 30 degrees and less than or equal to 45 degrees.

In one possible implementation manner, the second included angle is greater than or equal to 20 degrees and less than or equal to 45 degrees.

In a possible implementation manner, after the surface to be shielded of the second forming portion is shielded by the shielding jig and part of the contact surface of the first forming portion is exposed, the method further includes:

and carrying out baking finish treatment on the surface to be colored of the first forming part through a spray gun so as to enable the surface to be colored of the first forming part to have a first target color.

In a possible implementation manner, before the shielding jig shields the surface to be shielded of the second molding part, the method further includes:

the first forming portion is positioned and the flatness of the first forming portion is corrected through at least four buckle jigs.

According to a second aspect of the embodiments of the present disclosure, a terminal housing is provided, which is manufactured based on the two-material injection molding method of any one of the foregoing.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

according to the double-material injection molding method provided by the embodiment of the disclosure, the second forming part is shielded, so that paint is prevented from being sprayed on the second forming part when the first forming part is subjected to paint baking treatment; the pressure is applied to the second forming part to expose part of the contact surface of the first forming part, and the exposed contact surface of the first forming part is subjected to paint baking treatment, so that paint adopted by the paint baking treatment fills the gap between the surface to be colored of the first forming part and the surface to be shielded of the second forming part, and the visual effect of a product comprising the first forming part and the second forming part, namely the terminal shell, is favorably improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a flow chart illustrating a two-shot injection molding process according to an exemplary embodiment;

FIG. 2 is a schematic structural view of the first molding portion, the second molding portion and the shielding fixture after the shielding fixture shields the surface to be shielded of the second molding portion;

FIG. 3 is a flow chart illustrating a two-shot injection molding method according to another exemplary embodiment.

Description of reference numerals:

1-a first molding section;

11-a surface to be colored;

12-a contact surface;

2-a second molding section;

21-a surface to be shielded;

3-shielding the fixture.

With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of products and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

For details which are not disclosed in the embodiments of the product of the present disclosure, refer to the embodiments of the method of the present disclosure.

In the related art, in order to enhance the richness of the color of the terminal housing, it is common to add different coloring materials to the plastic material so that the terminal housing can exhibit various colors. However, due to the limitations of the composition of the plastic raw material, the addition of colorants to the plastic raw material is limited, i.e., the colors that can be rendered by the terminal housing are limited.

In order to protect the screen on the terminal, a double-material housing is generally formed around the terminal screen, wherein one type of plastic forms a first part which is arranged around the terminal and extends downwards, and the other type of plastic forms a second part which is elastic, the second part is connected to the upper end of the first part facing the terminal screen, and the upper end of the second part extends upwards out of the terminal screen, so that when the terminal drops and the terminal screen faces downwards, the part of the second part extending out of the terminal screen can buffer the impact of the ground facing the terminal screen. Wherein, different pigments are respectively added in the two types of plastics, so that the first part and the second part are in different colors.

However, a certain gap exists at the joint of the first component and the second component due to certain errors existing in the production process of the first component and the second component, namely the injection molding process, and the visual effect of the product is affected.

Example one

FIG. 1 is a flow chart illustrating a two-shot injection molding process according to an exemplary embodiment; fig. 2 is a schematic structural diagram of the first molding portion, the second molding portion and the shielding jig after the shielding jig shields the surface to be shielded of the second molding portion.

Referring to fig. 1 in combination with fig. 2, an embodiment of the disclosure provides a two-material injection molding method, which includes the following steps:

s101, performing injection molding on a first type of material to form a first molding part, and performing injection molding on a second type of material to form a second molding part with elasticity on the first molding part; the first forming part is provided with a surface to be colored, the first forming part is provided with a contact surface which is used for being in contact with the second forming part and is connected with the surface to be colored, and the second forming part is provided with a surface to be shielded, which is the same as the surface to be colored of the first forming part;

in an example, when a first type of material is injection molded by an injection molding machine, the first type of material is injected into the injection molding machine, and the first type of material is heated and plasticized within a set time to form a first type of melt; injecting a first type of melting material into a mold cavity under a set pressure at a set speed, and maintaining the pressure of the first type of melting material in the mold cavity for shaping after the injection is finished; the pressure-retained and shaped product is cooled to solidify the cooled product to a predetermined rigidity, and finally, the first molded part 1 is obtained by demolding.

When the first molding part 1 is used to form a terminal housing, the first molding part 1 has a surface exposed to the outside; in order to improve the richness of the terminal appearance color, the exposed surface of the first molding part 1 may be colored, and thus, the exposed surface of the first molding part 1 is also the surface to be colored 11 of the first molding part 1.

For example, the injection molding process of the second molding part 2 may be similar to the injection molding process of the first molding part 1, and the description thereof is omitted.

The present example and the following examples will not describe the implementation and functions of the embodiments of the present disclosure by taking the first molding part 1 as the first component on the terminal housing and the second molding part 2 as the second component on the terminal housing for protecting the terminal screen. It can be understood that: in the specific implementation, the first molding part 1 and the second molding part 2 are not limited thereto.

The first molding part 1 is used for enclosing the periphery of the terminal screen and extending downwards and protecting a circuit board and the like below the terminal screen, therefore, the first molding part 1 needs to have certain rigidity, and the first material can be PC plastic. Wherein PC means Polycarbonate.

The second forming part 2 is connected at the upper end of the first forming part 1 and upwards extends out of the terminal screen, and the part of the second forming part 2 with elasticity extending out of the terminal screen is used for buffering the impact of the ground to the terminal screen when the terminal drops and the terminal screen faces downwards, so that the second material can adopt TPU soft glue. Wherein TPU refers to Thermoplastic polyurethane elastomer rubber.

For example, the second forming part 2 may cover the upper end of the first forming part 1, for example, the second forming part 2 may be n-shaped, and the upper end of the first forming part 1 covers the space of the n-shaped structure; of course, the structure of the second molding portion 2 is not limited thereto, and this example is only illustrated here. The second molding part 2 has a surface to be shielded 21 on the outer side, and the surface to be shielded 21 of the second molding part 2 is located on the same side as the surface to be colored 11 of the first molding part 1.

In order to improve the aesthetic property of the terminal housing, the junction between the second molding part 2 and the first molding part 1 is smoothly transited, that is, the junction between the surface to be colored 11 of the first molding part 1 and the surface to be shielded 21 of the second molding part 2 is smoothly transited, so that a groove may be provided at the upper end of the first molding part 1, and a portion of the second molding part 2 is located in the groove to improve the bonding force between the first molding part 1 and the second molding part 2, at this time, the first molding part 1 has a contact surface 12 contacting the second molding part 2 and connected to the surface to be shielded 21.

S102, shielding the surface to be shielded of the second forming part through a shielding jig, and applying pressure to the surface to be shielded so that the second forming part has a set deformation amount and part of a contact surface of the first forming part is exposed;

for example, the shielding jig 3 may have a clamping surface adapted to the second molding part 2 to reliably shield the second molding part 2, thereby avoiding adverse effects of subsequent steps on the second molding part. For example: when the second molding portion 2 is n-shaped, the clamping surface of the shielding jig 3 may also be n-shaped.

In a specific implementation, when the second forming portion 2 is placed in the shielding jig 3, the clamping surface of the shielding jig 3 may abut against the surface to be shielded 21 of the second forming portion 2 and apply a set pressure to the surface to be shielded 21 to compress the surface to be shielded 21 inward, so that the surface to be shielded 21 has a set displacement even though the second forming portion 2 has a set deformation amount, thereby exposing a part of the contact surface 12 of the first forming portion 1.

It can be understood that: the size of the exposed part of the contact surface 12 of the first forming part 1 is matched with the displacement of the surface 21 to be shielded of the second forming part 2 under the action of the shielding jig 3.

S103, performing paint baking treatment on the exposed part of the contact surface of the first forming part through a spray gun to enable the contact surface of the first forming part to have a first target color.

It is understood that the varnish-baking treatment of the contact surface 12 means that the exposed portion of the contact surface 12 is varnish-baked.

In a specific implementation, the paint is selected according to the first target color to be finally provided on the contact surface 12 of the first forming part 1, and the paint is applied to the contact surface 12 of the first forming part 1 and dried.

In the related art, due to a certain error in the production process, a certain gap exists at the joint of the first molding part 1 and the second molding part 2, for example, at the joint between the surface 11 to be colored of the first molding part 1 and the surface 21 to be shielded of the second molding part 2.

In the embodiment of the present disclosure, after the paint spraying process is also performed on the contact surface 12 of the first molding part 1, the paint sprayed on the contact surface 12 forms a coating that can fill the gap between the surface 11 to be colored of the first molding part 1 and the surface 21 to be shielded of the second molding part 2, so that the visual effect of the product including the first molding part 1 and the second molding part 2 can be improved.

The gap between the surface 11 to be colored of the first molding part 1 and the surface 21 to be shielded of the second molding part 2 is based on the gap before the second molding part 2 is shielded.

According to the two-material injection molding method provided by the embodiment of the disclosure, the second molding part 2 is shielded, so that paint is prevented from being sprayed on the second molding part 2 when the first molding part 1 is subjected to paint baking treatment; the application of pressure to the second forming part 2 to expose part of the contact surface 12 of the first forming part 1 and the baking finish treatment of the contact surface 12 exposed by the first forming part 1 are performed to fill the gap between the surface 11 to be colored of the first forming part 1 and the surface 21 to be shielded of the second forming part 2 with the paint adopted by the baking finish treatment, thereby being beneficial to improving the visual effect of the product comprising the first forming part 1 and the second forming part 2.

In a possible implementation manner of the present disclosure, before performing the second injection molding of the second type material on the first molding part 1, the method further includes: a coloring material is added to the second type material so that the second molding portion 2 can have a second target color.

It can be understood that: the hue or lightness or saturation of the second target color is different from that of the first target color, so that the product can present multiple colors, and the richness of the product colors is improved.

Of course, it is also possible to make the second molding portion 2 have the second target color by performing the baking finish process on the second molding portion 2 formed of the second type material; at this time, the first molding portion 1 may be masked so as not to affect the visual effect of the first molding portion 1.

In a possible implementation manner of the present disclosure, when the second forming portion 2 is pressed, the deformation amount of the second forming portion 2 is greater than or equal to 0.25 mm and less than or equal to 0.35 mm, that is, the displacement of the surface 21 to be shielded of the second forming portion 2 under the action of the shielding jig 3 is greater than or equal to 0.25 mm and less than or equal to 0.35 mm, that is, the size of the part of the contact surface 12 of the first forming portion 1 along the displacement direction of the surface 21 to be shielded is greater than or equal to 0.25 mm and less than or equal to 0.35 mm.

In a specific implementation, the amount of deformation of second forming portion 2 is proportional to the pressure applied by shielding jig 3 to surface 21 to be shielded of second forming portion 2, and the amount of deformation of second forming portion 2 increases as the pressure applied by shielding jig 3 to surface 21 to be shielded of second forming portion 2 increases.

As an example, the pressure applied by the shielding jig 3 to the surface 21 to be shielded of the second forming portion 2 may be related to the clamping surface on the shielding jig 3; for example, the clamping space surrounded by the clamping surfaces may be smaller than the second molding part 2, so that when the second molding part 2 is placed in the clamping space of the shielding jig 3, the second molding part 2 is extruded and deformed.

In the embodiment of the disclosure, the deformation amount of the second forming portion 2 is set to be greater than or equal to 0.25 mm and less than or equal to 0.35 mm, so that the filling effect of the paint on the contact surface 12 on the gap between the surface 11 to be colored of the first forming portion 1 and the surface 21 to be shielded of the second forming portion 2 can be better ensured; at the same time, damage to the second molding portion 2 due to excessive pressure can also be avoided.

In a possible implementation manner of the present disclosure, a distance between the contact surface 12 exposed on the first molding part 1 and the shielding jig 3 is greater than or equal to 0.08 mm and less than or equal to 0.12 mm, so that the paint on the contact surface 12 can have a certain thickness to better ensure a filling effect of the paint on the contact surface 12 on a gap between the surface 11 to be colored of the first molding part 1 and the surface 21 to be shielded of the second molding part 2, and at the same time, the paint can be prevented from being stained on the shielding jig 3 when the paint baking treatment is performed on the contact surface 12 of the first molding part 1.

By way of example, the dimension of the portion of the second forming part 2 that shields the surface 21 to be shielded in the moving direction of the surface 21 to be shielded may be slightly larger than the corresponding dimension of the exposed portion of the contact surface 12 of the first forming part 1, i.e. slightly larger than the displacement of the surface 21 to be shielded, so as to prevent the paint from being stained on the second forming part 2 when the surface 12 of the first forming part 1 is subjected to the baking process.

In the embodiment of the disclosure, since there is a gap between the shielding jig 3 and the contact surface 12, when the shielding jig 3 is removed and the second molding portion 2 is rebounded to the shielding surface 21, the paint on the first molding portion 1 is not affected, and a saw-toothed structure of the paint on the first molding portion 1 is effectively avoided, so that the boundary between the first molding portion 1 and the second molding portion 2 is clearer, and the visual effect is further improved.

In a possible implementation manner of the present disclosure, before the shielding jig 3 shields the surface to be shielded 21 of the second molding part 2, the method further includes: the first forming part 1 is positioned and the flatness of the first forming part is corrected through at least four buckle jigs.

During concrete implementation, all the buckle jigs are located on the same plane so as to better correct the flatness of the first forming part.

The first forming portion 1 is not used as an example of a rectangle, and four buckles are respectively arranged at four top points of the rectangle to reliably position the first forming portion 1, and meanwhile, the flatness of the first forming portion can be corrected, so that the surface 11 to be colored and the contact surface 12 of the first forming portion are colored more uniformly.

When the number of the buckles is 6, four of the buckles are respectively at four top points of the rectangle, and the other two buckles can be symmetrically distributed in the middle of two sides of the second forming part 2, for example, in the middle of the long side of the rectangle.

By adopting the material injection molding method provided by the embodiment, after the first molding part 1 is subjected to paint baking treatment, the shielding jig 3 can be removed, the surface 21 to be shielded of the second molding part 2 is rebounded to be in smooth transition with the surface 11 to be colored of the first molding part 1, and at the moment, the paint material at the joint of the contact surface 12 close to the surface 11 to be colored can fill the gap between the surface 21 to be shielded and the surface 11 to be colored, so that the visual effect is improved; meanwhile, a gap exists between the shielding jig 3 and the contact surface 12, when the shielding jig 3 is removed and the second forming portion 2 is to be rebounded from the shielding surface 21, the paint on the first forming portion 1 is not affected, and a saw-toothed structure of the paint on the first forming portion 1 is effectively avoided, so that the boundary between the first forming portion 1 and the second forming portion 2 is clearer, and the visual effect is further improved.

Referring to fig. 3 in combination with fig. 2, an embodiment of the disclosure provides a two-material injection molding method, which includes the following steps:

s201, performing primary injection molding on a first type of material to form a first molding part, wherein a glue pulling groove is formed in the first molding part; wherein, the first forming part is provided with a surface to be colored;

s202, carrying out secondary injection molding on the second material, and filling a glue pulling groove with part of the second material so as to form an elastic second forming part on the first forming part; the first forming part is provided with a contact surface which is used for contacting with the second forming part and is connected with the surface to be colored, and the second forming part is provided with a surface to be shielded which is the same with the surface to be colored of the first forming part;

s203, shielding the surface to be shielded of the second forming part by using a shielding jig, and applying pressure to the surface to be shielded so that the second forming part has a set deformation amount and part of the contact surface of the first forming part is exposed;

s204, performing paint baking treatment on the surface to be colored of the first forming part through a spray gun to enable the surface to be colored of the first forming part to have a first target color;

and S205, performing paint baking treatment on the exposed part of the contact surface of the first forming part through a spray gun to enable the contact surface of the first forming part to have a first target color.

The implementation and functions of step S203 and step S205 are the same as those of step S102 and step S103, and are not described herein again.

In steps S201 and S202, the first material is injection molded to form the first molding portion 1, which is similar to the above-mentioned first material, and is not described herein again. The realization of the second molding part 2 with elasticity on the first molding part 1 by injection molding of the first type of material may be similar to the foregoing, and will not be described here again.

In this example, a plurality of glue pulling grooves are uniformly distributed in the first molding part 1; when second shaping portion 2 connects the upper end at first shaping portion 1, the upper end of first shaping portion 1 can be formed with a plurality of evenly distributed draw gluey groove to when moulding plastics second class material, second class material can fill draws gluey groove, in order to do benefit to first shaping portion 1 and the integrative setting of second shaping portion 2.

In step S204, a corresponding paint may be selected according to a first target color that the first molding portion 1 is to have on the surface 11 to be colored, and the paint may be applied to the surface 11 to be colored of the first molding portion 1 and dried. In order to improve the texture of the product, that is, the terminal housing, the first target color may be a color of aluminum or an aluminum alloy, that is, a silver color.

Taking the first target color as silver as an example, before the first material is injection molded, a coloring material close to silver can be added into the first material, so that the color of the surface 11 to be colored of the first molding part 1 is closer to that of the contact surface 12, and the visual effect is further improved.

By performing the baking finish treatment on the surface 11 to be colored of the first molding part 1, the first target color of the first molding part 1 can be selected in a wider range, for example, the first molding part 1 made of plastic can also present the color of metal, which is beneficial to improving the texture of the product.

In the embodiment of the present disclosure, after the paint spraying process is also performed on the contact surface 12 of the first molding part 1, the paint sprayed on the contact surface 12 can fill the gap between the surface 11 to be colored of the first molding part 1 and the surface 21 to be shielded of the second molding part 2, so that the color at the upper end of the first molding part 1 can be prevented from being exposed from the gap at the connection between the first molding part 1 and the second molding part 2, which is beneficial to improving the visual effect of the product including the first molding part 1 and the second molding part 2.

In a possible implementation manner of the present disclosure, the varnish-baking treatment of the exposed portion of the contact surface 12 of the first forming part 1 by a spray gun comprises:

setting a spray gun to perform paint baking treatment on a first set area facing a surface to be colored 11 on a contact surface 12 of the first forming part 1 in a first spraying direction; a first included angle is formed between the first spraying direction and the contact surface 12;

setting a spray gun to carry out paint baking treatment on a second set area, which is far away from the surface 11 to be colored, on the contact surface 12 of the first forming part 1 in a second spraying direction; a second included angle is formed between the second spraying direction and the contact surface 12;

As shown in fig. 2, the first ejection direction is directed from the upper right to the lower left, and the second ejection direction is directed from the upper left to the lower right.

It can be understood that: the second setting area is positioned at the inner side of the first setting area, and due to the shielding effect of the shielding jig 3, when the second setting area is subjected to paint baking treatment, the mode which can be realized by the second spraying direction is unique, namely the second spraying direction can only point to the lower right from the upper left; and determining the mode which can be realized by the first injection direction according to the vector angle formed by the first injection direction and the second injection direction and the relation between the first included angle and the second included angle.

When the contact surface 12 of the first forming part 1 is subjected to baking finish treatment in a first set area facing the surface 11 to be colored in a first spraying direction by a set spray gun, paint on the contact surface 12 can be effectively prevented from being stained on the surface 21 to be shielded of the second forming part 2, namely, paint overflow can be prevented under the limitation of the first spraying direction and the first included angle, the visual effect of a product can be guaranteed, and meanwhile, the paint on the contact surface 12 can be prevented from being stained on the shielding jig 3.

When a second set area deviating from the surface 11 to be colored on the contact surface 12 of the first forming part 1 in the second spraying direction is subjected to paint baking treatment by the set spray gun, paint on the contact surface 12 can be effectively prevented from being stained on the surface 21 to be shielded of the second forming part 2, namely, paint overflow can be prevented under the limitation of the second spraying direction and the second included angle, the visual effect of a product can be guaranteed, and meanwhile, the paint on the contact surface 12 can be prevented from being stained on the shielding jig 3.

In an example, the first included angle is greater than or equal to 30 degrees and less than or equal to 45 degrees, so that the effect of preventing paint overflow is improved; the second included angle is more than or equal to 20 degrees and less than or equal to 45 degrees, so that the effect of preventing paint overflow is improved.

Taking the product as a housing of a smart phone as an example, for a conventional size of the smart phone, the deformation amount of the second molding part 2, that is, the displacement of the surface to be shielded 21 may be 0.3 mm when the second molding part 2 is pressed; the distance between the contact surface 12 of the first forming part 1 and the shielding jig 3 is 0.4 mm; the first included angle may be 30 degrees or 45 degrees; the second included angle may be 20 degrees or 45 degrees.

Example two

The embodiment of the disclosure provides a terminal shell which is manufactured based on the two-material injection molding method in any one of the previous examples.

In the embodiment of the present disclosure, the terminal housing may be a housing, that is, a body, of a terminal such as a smart phone, a tablet, a notebook, and the like.

It should be noted that: in the present disclosure, terms such as "upper", "lower", "inner" and "outer" are used to describe relative positions of the respective structures in the drawings, and are not used to limit the scope of the present disclosure, and changes or adjustments of the relative relationships thereof are also considered to be the scope of the present disclosure without substantial technical changes.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A two-material injection molding method is characterized by comprising the following steps:

performing one-time injection molding on a first type of material to form a first molding part, wherein a glue pulling groove is formed in the first molding part; performing secondary injection molding on a second type of material, and filling a part of the second type of material into the glue pulling groove so as to form a second forming part with elasticity on the first forming part;

the first forming part is provided with a surface to be colored, the first forming part is provided with a contact surface which is used for being in contact with the second forming part and is connected with the surface to be colored, and the second forming part is provided with a surface to be shielded, which is the same side with the surface to be colored of the first forming part;

2. The two-shot molding method according to claim 1, further comprising, before the second-shot molding the second type of material on the first mold portion: adding a coloring material to the second type material to enable the second molded part to have a second target color.

3. A two-shot injection molding method according to claim 1, wherein the set deformation amount is 0.25 mm or more and 0.35 mm or less.

4. The two-material injection molding method according to claim 1, wherein a distance between the exposed contact surface of the first molding portion and the shielding jig is greater than or equal to 0.08 mm and less than or equal to 0.12 mm.

5. The two-material injection molding method according to claim 1, wherein the varnish-baking process is performed on the exposed portion of the contact surface of the first molding part by a spray gun, and comprises:

6. The two-material injection molding method according to claim 5, wherein the first included angle is greater than or equal to 30 degrees and less than or equal to 45 degrees; and/or the second included angle is greater than or equal to 20 degrees and less than or equal to 45 degrees.

7. The two-material injection molding method according to claim 1, further comprising, after shielding the surface to be shielded of the second molding part by a shielding jig and exposing a part of the contact surface of the first molding part:

8. The two-material injection molding method according to claim 1, further comprising, before shielding the surface to be shielded of the second molding part by the shielding jig:

9. A terminal housing, characterized in that it is manufactured on the basis of the two-component injection molding method according to any one of claims 1 to 8.