CN117123781A - Injection molding method for high-strength light steel mobile phone hinge - Google Patents

Abstract

The invention relates to the technical field of mobile phone hinge preparation, specifically an injection molding method for high-strength lightweight steel mobile phone hinges, which includes the following steps: S1, prepare materials, mix high-strength lightweight steel powder and binder, dry, and form Granules to prepare raw materials; S2, feeding, put the raw materials into the injection molding machine, injection molding at an injection temperature of 160~190°C, an injection pressure of 60~127MPa, and a mold temperature of 112~125°C to prepare blank. The injection molding method of the high-strength lightweight steel mobile phone hinge adopts the injection molding method to facilitate the processing of different parts of the mobile phone hinge. The high-strength lightweight steel ensures the strength and durability of the mobile phone hinge. At the same time, the degreasing effect is good, ensuring that the blank after degreasing is The conformal effect and surface smoothness prevent deformation and surface roughness after sintering, further improve the dimensional accuracy of the finished product, reduce the difficulty of subsequent trimming, improve production efficiency, and reduce production costs.

Description

An injection molding method for high-strength lightweight steel mobile phone hinges

Technical field

The invention relates to an injection molding method for a high-strength lightweight steel mobile phone hinge, and belongs to the technical field of mobile phone hinge preparation.

Background technique

With the development of mobile phone technology, the technology of folding screen mobile phones has become more and more mature. The hinge is a key component connecting the casing of folding screen mobile phones. It is responsible for supporting and guiding the opening and closing of the screen. Its performance directly affects the overall durability and service life of the mobile phone. At the beginning, the hinge design of folding screen mobile phones was relatively simple and was mainly used to showcase concepts and technologies. Their durability was generally low and not suitable for daily use. However, with significant improvements and innovations in mobile phone hinge design, more complex and A more refined structure and the use of more durable materials make the opening and closing of the mobile phone hinge smoother and more stable. At the same time, the durability is very high and can withstand high-intensity and long-term use, making it suitable for daily use. With the use of materials and Structural improvements have made the technology of mobile phone hinges more mature, and the production requirements for mobile phone hinges have become higher, which not only needs to meet the requirements of production accuracy, but also improve production efficiency and manage production costs.

At present, high-strength lightweight steel mobile phone hinges are generally produced by powder injection molding. However, the structure of the mobile phone hinge is small and the thickness is thin. As a result, after sintering, the surface of the mobile phone hinge is not smooth and the surface precision is not high, requiring secondary trimming. , not only affects production efficiency, but also increases production costs.

Contents of the invention

The purpose of the present invention is to provide an injection molding method for a high-strength lightweight steel mobile phone hinge. The injection molding method facilitates the processing of different parts of the mobile phone hinge, and the high-strength lightweight steel ensures the strength and durability of the mobile phone hinge, and at the same time has a good degreasing effect. , which ensures the shape-keeping effect and surface smoothness of the degreased blank, prevents deformation and surface roughness after sintering, further improves the dimensional accuracy of the finished product, reduces the difficulty of subsequent trimming, improves production efficiency, and reduces costs. Cost of production.

In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

An injection molding method for high-strength lightweight steel mobile phone hinges, including the following steps:

S1, prepare materials, mix high-strength lightweight steel powder and binder, dry and granulate to obtain raw materials;

S2, feeding, put the raw materials into the injection molding machine, injection molding at an injection temperature of 160-190°C, an injection pressure of 60-127MPa, and a mold temperature of 112-125°C to prepare a blank;

S3, degreasing, first immerse the blank in the solvent for solvent degreasing for 4 to 8 hours. The degreasing temperature is 30 to 60°C. After degreasing, take it out and dry it, and then perform thermal degreasing;

S4, sintering, send the degreased blank into the sintering furnace for sintering. The sintering temperature is 1200~1350℃, and the temperature is maintained for 1~2 hours. Inert gas protection is used during the sintering process;

S5, finished product inspection, the blank is cooled in the furnace after sintering to obtain a sintered billet, and the sintered billet is inspected to see if it meets the design requirements.

Preferably, the high-strength lightweight steel powder in step S1 is aerosolized metal powder, and the particle size is 4-20 μm.

Preferably, the binder in step S1 includes the following components by mass:

35-55 parts of paraffin, 15-20 parts of polyethylene glycol, 20-30 parts of polypropylene and 1-2 parts of antioxidants.

Preferably, in step S1, the mixing is carried out by melting and kneading in an internal mixer, and the internal mixer is mixed at 150°C to 220°C for 2h to 4h.

Preferably, in step S2, the prepared blank is manually inspected.

Preferably, in the step S3, the thermal degreasing temperature is 50-450°C and the degreasing time is 3-6 hours.

Preferably, before step S4, the blank needs to be put into a low-pressure sintering furnace for pre-sintering, and the pre-sintering temperature is 500 to 850°C.

The present invention at least has the following beneficial effects:

The injection molding method is used to facilitate the processing of different parts of the mobile phone hinge, and the high-strength lightweight steel ensures the strength and durability of the mobile phone hinge. At the same time, the degreasing effect is good, ensuring the shape-keeping effect and surface smoothness of the blank after degreasing, and preventing sintering. The final deformation and surface roughness further improve the dimensional accuracy of the finished product, reduce the difficulty of subsequent trimming, improve production efficiency, and reduce production costs.

Description of the drawings

The drawings described here are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the attached picture:

Figure 1 is a schematic process diagram of the injection molding method of the present invention.

Detailed ways

The embodiments of the present application will be described in detail below with reference to the drawings and examples, so that the implementation process of how the present application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

Example 1:

As shown in Figure 1, this embodiment provides an injection molding method for a high-strength lightweight steel mobile phone hinge, including the following steps:

S1, prepare materials, mix high-strength lightweight steel powder and binder, dry, and granulate to obtain raw materials. The high-strength lightweight steel powder is an atomized metal powder with a particle size of 4 to 20 μm and is bonded. The agent includes the following components by mass:

35 parts paraffin, 20 parts polyethylene glycol, 30 parts polypropylene and 1 part antioxidant;

The mixing is carried out by melting and mixing in an internal mixer, and the internal mixer is mixed at 220°C for 2 hours;

S2, feeding, put the raw materials into the injection molding machine, injection molding at an injection temperature of 190°C, an injection pressure of 127MPa, and a mold temperature of 125°C, prepare a blank, and perform manual inspection;

S3, degreasing, first immerse the blank in the solvent for solvent degreasing for 6 hours, the degreasing temperature is 45°C, take it out and dry it after degreasing, and then perform thermal degreasing, the thermal degreasing temperature is 450°C, degreasing for 6 hours;

S4, sintering. Before sintering, the blank needs to be put into a low-pressure sintering furnace for pre-sintering. The pre-sintering temperature is 850°C. Then the degreased blank is sent to the sintering furnace for sintering. The sintering temperature is 1200°C. , heat preservation for 2 hours, using inert gas protection during the sintering process;

S5, finished product inspection, the blank is cooled in the furnace after sintering to obtain a sintered billet, and the sintered billet is inspected to see if it meets the design requirements.

Example 2:

As shown in Figure 1, this embodiment provides an injection molding method for a high-strength lightweight steel mobile phone hinge, including the following steps:

S1, prepare materials, mix high-strength lightweight steel powder and binder, dry, and granulate to obtain raw materials. The high-strength lightweight steel powder is an atomized metal powder with a particle size of 4 to 20 μm and is bonded. The agent includes the following components by mass:

40 parts paraffin, 15 parts polyethylene glycol, 30 parts polypropylene and 1 part antioxidant;

The mixing is carried out by melting and mixing in an internal mixer, and the internal mixer is mixed at 200°C for 2 hours;

S2, feeding, put the raw materials into the injection molding machine, injection molding at an injection temperature of 180°C, an injection pressure of 120MPa, and a mold temperature of 115°C, prepare a blank, and perform manual inspection;

S3, degreasing, first immerse the blank in the solvent for solvent degreasing for 8 hours, the degreasing temperature is 50°C, take it out and dry it after degreasing, and then perform thermal degreasing, the thermal degreasing temperature is 400°C, degreasing for 4 hours;

S4, sintering. Before sintering, the blank needs to be put into a low-pressure sintering furnace for pre-sintering. The pre-sintering temperature is 650°C. Then the degreased blank is sent to the sintering furnace for sintering. The sintering temperature is 1250°C. , heat preservation for 2 hours, using inert gas protection during the sintering process;

S5, finished product inspection, the blank is cooled in the furnace after sintering to obtain a sintered billet, and the sintered billet is inspected to see if it meets the design requirements.

Embodiment three:

As shown in Figure 1, this embodiment provides an injection molding method for a high-strength lightweight steel mobile phone hinge, including the following steps:

S1, prepare materials, mix high-strength lightweight steel powder and binder, dry, and granulate to obtain raw materials. The high-strength lightweight steel powder is an atomized metal powder with a particle size of 4 to 20 μm and is bonded. The agent includes the following components by mass:

40 parts of paraffin, 20 parts of polyethylene glycol, 25 parts of polypropylene and 2 parts of antioxidants;

The mixing is carried out by melting and mixing in an internal mixer. The internal mixer is operated at 180°C for 3 hours;

S2, feeding, put the raw materials into the injection molding machine, injection molding at an injection temperature of 165°C, an injection pressure of 95MPa, and a mold temperature of 120°C, prepare a blank, and perform manual inspection;

S3, degreasing, first immerse the blank in the solvent for solvent degreasing for 6 hours, the degreasing temperature is 50°C, take it out and dry it after degreasing, and then perform thermal degreasing, the thermal degreasing temperature is 350°C, degreasing for 6 hours;

S4, sintering. Before sintering, the blank needs to be put into a low-pressure sintering furnace for pre-sintering. The pre-sintering temperature is 550°C. Then the degreased blank is sent to the sintering furnace for sintering. The sintering temperature is 1200°C. , heat preservation for 2 hours, using inert gas protection during the sintering process;

S5, finished product inspection, the blank is cooled in the furnace after sintering to obtain a sintered billet, and the sintered billet is inspected to see if it meets the design requirements.

Embodiment 4:

As shown in Figure 1, this embodiment provides an injection molding method for a high-strength lightweight steel mobile phone hinge, including the following steps:

S1, prepare materials, mix high-strength lightweight steel powder and binder, dry, and granulate to obtain raw materials. The high-strength lightweight steel powder is an atomized metal powder with a particle size of 4 to 20 μm and is bonded. The agent includes the following components by mass:

55 parts paraffin, 15 parts polyethylene glycol, 20 parts polypropylene and 1 part antioxidant;

The mixing is carried out by melting and mixing in an internal mixer, and the internal mixer is mixed at 220°C for 2 hours;

S2, feeding, put the raw materials into the injection molding machine, injection molding at an injection temperature of 170°C, an injection pressure of 80MPa, and a mold temperature of 125°C, prepare a blank, and perform manual inspection;

S3, degreasing, first immerse the blank in the solvent for solvent degreasing for 8 hours, the degreasing temperature is 30°C, take it out and dry it after degreasing, and then perform thermal degreasing, the thermal degreasing temperature is 350°C, degreasing for 4 hours;

S4, sintering. Before sintering, the blank needs to be put into a low-pressure sintering furnace for pre-sintering. The pre-sintering temperature is 850°C. Then the degreased blank is sent to the sintering furnace for sintering. The sintering temperature is 1200°C. , Insulation 1, use inert gas protection during the sintering process;

S5, finished product inspection, the blank is cooled in the furnace after sintering to obtain a sintered billet, and the sintered billet is inspected to see if it meets the design requirements.

Embodiment five:

As shown in Figure 1, this embodiment provides an injection molding method for a high-strength lightweight steel mobile phone hinge, including the following steps:

S1, prepare materials, mix high-strength lightweight steel powder and binder, dry, and granulate to obtain raw materials. The high-strength lightweight steel powder is an atomized metal powder with a particle size of 4 to 20 μm and is bonded. The agent includes the following components by mass:

45 parts paraffin, 20 parts polyethylene glycol, 20 parts polypropylene and 1 part antioxidant;

The mixing is carried out by melting and mixing in an internal mixer, and the internal mixer is mixed at 220°C for 4 hours;

S2, feeding, put the raw materials into the injection molding machine, injection molding at an injection temperature of 175°C, an injection pressure of 110MPa, and a mold temperature of 125°C, prepare a blank, and perform manual inspection;

S3, degreasing, first immerse the blank in the solvent for solvent degreasing for 5 hours, the degreasing temperature is 40°C, take it out and dry it after degreasing, and then perform thermal degreasing, the thermal degreasing temperature is 250°C, degreasing for 7 hours;

S4, sintering. Before sintering, the blank needs to be put into a low-pressure sintering furnace for pre-sintering. The pre-sintering temperature is 750°C. Then the degreased blank is sent to the sintering furnace for sintering. The sintering temperature is 1250°C. , heat preservation for 2 hours, using inert gas protection during the sintering process;

S5, finished product inspection, the blank is cooled in the furnace after sintering to obtain a sintered billet, and the sintered billet is inspected to see if it meets the design requirements.

Compared with Example 1, Example 4 and Example 5, the different components of the binder and the degreasing method have a certain impact on the final surface smoothness of the product, thereby achieving better degreasing and ensuring that the degreased blank is The conformal effect and surface smoothing effect prevent deformation and surface roughness after sintering.

For example, certain words are used in the description and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and the claims do not use differences in names as a means to distinguish components; rather, differences in functions of the components serve as a criterion for distinction. For example, the word "include" mentioned throughout the description and claims is an open-ended term, so it should be interpreted as "include but not limited to." "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical results.

It should be noted that the terms "includes", "includes" or any other variation thereof are intended to cover non-exclusive inclusion, such that a good or system including a list of elements includes not only those elements, but also those not expressly listed Other elements may also include elements inherent to the product or system. Without further limitation, an element qualified by the statement "includes a..." does not exclude the presence of other identical elements in the goods or systems that include the element.

The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various embodiments. other combinations, modifications and environments, and can be modified through the above teachings or technology or knowledge in related fields within the scope of the inventive concept described herein. Any modifications and changes made by those skilled in the art that do not depart from the spirit and scope of the present invention shall be within the protection scope of the appended claims of the present invention.

Claims (7)

1. An injection molding method for high-strength lightweight steel mobile phone hinges, which is characterized by including the following steps: S1, prepare materials, mix high-strength lightweight steel powder and binder, dry and granulate to obtain raw materials; S2, feeding, put the raw materials into the injection molding machine, injection molding at an injection temperature of 160-190°C, an injection pressure of 60-127MPa, and a mold temperature of 112-125°C to prepare a blank; S3, degreasing, first immerse the blank in the solvent for solvent degreasing for 4 to 8 hours. The degreasing temperature is 30 to 60°C. After degreasing, take it out and dry it, and then perform thermal degreasing; S4, sintering, send the degreased blank into the sintering furnace for sintering. The sintering temperature is 1200~1350℃, and the temperature is maintained for 1~2 hours. Inert gas protection is used during the sintering process; S5, finished product inspection, the blank is cooled in the furnace after sintering to obtain a sintered billet, and the sintered billet is inspected to see if it meets the design requirements. 2. The injection molding method of a high-strength lightweight steel mobile phone hinge according to claim 1, characterized in that: in the step S1, the high-strength lightweight steel powder is an atomized metal powder, and the particle size is 4 to 20 μm. . 3. The injection molding method of a high-strength lightweight steel mobile phone hinge according to claim 1, characterized in that: in the step S1, the adhesive includes the following components by mass: 35-55 parts of paraffin, 15-20 parts of polyethylene glycol, 20-30 parts of polypropylene and 1-2 parts of antioxidants. 4. The injection molding method of a high-strength lightweight steel mobile phone hinge according to claim 1, characterized in that: in the step S1, the mixing is carried out through an internal mixer, and the internal mixer is heated at 150°C to 220°C. ℃, mixing for 2h ~ 4h. 5. The injection molding method of high-strength lightweight steel mobile phone hinge according to claim 1, characterized in that: in step S2, the prepared blank is manually inspected. 6. The injection molding method of high-strength lightweight steel mobile phone hinge according to claim 1, characterized in that: in step S3, the thermal degreasing temperature is 50-450°C and the degreasing time is 3-6 hours. 7. The injection molding method of a high-strength lightweight steel mobile phone hinge according to claim 1, characterized in that: before step S4, the blank needs to be put into a low-pressure sintering furnace for pre-sintering, and the pre-sintering temperature is 500～850℃.