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A method of manufacturing a mobile phone middle frame using powder injection molding technology

A technology of powder injection molding and mobile phone middle frame, which is applied in the field of powder metallurgy, can solve the problems of large CNC processing volume, segregation, and low processing efficiency, and achieve the effects of reducing CNC processing costs, expanding the selection range, and improving production efficiency

Active Publication Date: 2017-12-26
SHENZHEN ELEMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used methods for the middle frame of metal mobile phones are: (1) The whole aluminum alloy, stainless steel plate, etc. are processed by CNC. And the processing efficiency is low and the cost is high
(2) The general shape of the middle frame is forged by forging, followed by CNC processing, which reduces the CNC machining allowance and improves production efficiency compared with method (1). The disadvantage is that the forging accuracy is poor and the CNC processing volume is still relatively large.
(4) Some low-melting point alloys are formed by die-casting, and then processed into a middle frame by CNC. It is characterized by low cost and easy mass production for some low-melting point alloys, but the surface density of processed products is not enough, and segregation is easy to occur. Microstructure The uniformity is poor, and the appearance cannot meet the requirements after treatment
Its characteristic is that it can improve production efficiency, but it is difficult to form some materials with high melting point

Method used

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  • A method of manufacturing a mobile phone middle frame using powder injection molding technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 A 316L stainless steel mobile phone middle frame manufactured by powder injection molding technology

[0029] Firstly, through the powder injection molding process, the middle frame parts are manufactured: the 316L stainless steel feed material is heated to 195°C through the injection molding machine, and the mold temperature is 110°C, and injected into the middle frame part mold. Raise the speed to 520°C, keep it for 1h, and finally raise the temperature to 1350°C at a speed of 5°C / min, keep it for 3h and then lower the temperature to get the final sintered middle frame loose product, the density is about 98%, the tensile strength is greater than 450MPa, and the elongation The rate is greater than 50%; after shaping, the positioning hole is machined by CNC, riveted with rivets through a special fixture combination, T treatment is performed after the internal size is refined, the middle frame parts are connected by in-mold injection molding, and then the size a...

Embodiment 2

[0030] Example 2 A middle frame of 304 stainless steel mobile phone manufactured by powder injection molding technology

[0031] A 304 stainless steel mobile phone middle frame is manufactured by powder injection molding technology. Firstly, the powder injection molding process is used to manufacture the middle frame parts: the 304 stainless steel feed material is heated to 190°C through the injection molding machine, and the mold temperature is 120°C, and injected into the middle frame bulk. In the part mold, after degreasing, the temperature is raised to 520°C at a speed of 5°C / min, kept for 1h, and finally the temperature is raised to 1280°C at a speed of 5°C / min, kept for 3h and then lowered to obtain the final sintered middle frame component Products, the density is greater than 97%, the tensile strength is greater than 450MPa, and the elongation is greater than 50%. The frame parts are connected, and then the size and shape are finished by CNC, and finally the appearance...

Embodiment 3

[0032] Example 3 A middle frame of a titanium alloy mobile phone manufactured by powder injection molding technology

[0033] A titanium alloy mobile phone middle frame is manufactured by using powder injection molding technology. Firstly, the powder injection molding process is used to manufacture the middle frame parts: the titanium alloy feed is heated to 170°C through the injection molding machine, the mold temperature is 120°C, and injected into the middle frame loose parts. In the part mold, after degreasing, adjust the vacuum degree to 10 -3 Pa, first gradually increase the temperature to 350°C at a rate of 2°C / min and keep it for 0.5h, then gradually increase the temperature at a rate of 2°C / min to 520°C and keep it for 1h, and finally increase the temperature at a rate of 5°C / min The speed is increased to 1250°C, kept for 3 hours and then cooled down to obtain the final sintered middle frame loose product with a density of about 95%, a tensile strength of 550MPa, and ...

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Abstract

The invention relates to the technical field of powder metallurgy, and particularly discloses a method for manufacturing a mobile phone middle frame through a powder injection forming technology. The method includes the following steps that S1, spare parts of the middle frame are manufactured through the powder injection forming technology; S2, positioning holes are machined in the prepared spare parts of the middle frame, and are riveted through rivets by means of a combined clamp, and T treatment is conducted after internal dimensions are subjected to fine trimming; S3, the spare parts of the middle frame are connected together through in-mold injection molding, then finish machining of the dimensions and appearance is conducted, and finally appearance aftertreatment is carried out so that the final mobile phone middle frame can be obtained. By the adoption of the method, the defects that according to an existing metal mobile phone middle frame, monoblock metal is used for CNC machining of raw materials, so that consumption is large and cost is high are overcome; production efficiency is greatly improved, and a large number of materials, labor, machine tools and the like are omitted.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a method for manufacturing a mobile phone middle frame by using powder injection molding technology. Background technique [0002] With the development of the mobile phone industry, consumers have put forward higher requirements for the hand feel, drop resistance, corrosion resistance and appearance of mobile phones. Among them, the metal mobile phone middle frame has become more and more mainstream due to its unique characteristics. At present, the commonly used methods for the middle frame of metal mobile phones are: (1) The whole aluminum alloy, stainless steel plate, etc. are processed by CNC. And processing efficiency is low, and cost is high. (2) The general shape of the middle frame is forged by forging, and the subsequent CNC processing is characterized by reducing the CNC machining allowance and improving production efficiency compared with method (1). The dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22B22F5/10
Inventor 余鹏顾道敏吕永虎屈小勇谭欣薄震
Owner SHENZHEN ELEMENT TECH CO LTD