Description
Mobile phones are a very important tool in today’s society. A mobile phone can solve many things in life and work. The rapid development of mobile phone technology has brought the entire industry into the fast lane of development. To determine whether a mobile phone brand has good sales, in addition to good software, the hardware must also be very good. Take the case for example, so you must put more thought into developing and designing the mobile phone case. The production of a mobile phone case covers structural design, mold development, injection molding production, spray printing and other processes. Each link will affect the final appearance. Mobile phone case mold design should still pay attention to these points.
Structural design
Mobile phone casing usually consists of four major parts: face case (upper front), front support (upper rear), back support (lower front), back shell (lower rear) and some small parts, such as battery cover, buttons, windows, and buckles. , anti-scratch strips, etc. The structural design of these components requires full consideration of interoperability and assembly with components such as circuit boards and batteries. There are many related issues that need to be considered in structural design, such as material selection, internal structure, surface treatment, processing methods, packaging and decoration, etc. The specific points are as follows:
a. It is necessary to review whether the design is reasonable and reliable, including the manufacturing method, the mold ejection direction, mold ejection angle, core pulling, structural strength, circuit installation (cooperating with electronic engineering personnel), etc.
b. Determine whether the manufacturing process can be realized based on the modeling requirements, including mold manufacturing, product assembly, shell spraying, silk screen printing, material selection, supply of parts to be purchased, etc.
c. Determine whether the product function can be realized and whether the user can use it optimally.
d. Carry out specific structural design and determine the manufacturing process of each part. Pay attention to the structural strength, installation positioning, fastening methods, product variants, installation positioning of components, and safety requirements of plastic parts to determine the best assembly route.
e. Structural design should minimize the difficulty of mold design and manufacturing, improve the efficiency of injection molding production, and reduce mold and production costs.
f. Determine the production process and testing methods of the entire product to ensure product reliability.
Mold design
Mold design must fully consider the structure and assembly of the product, as well as the demoulding of the product during production, waterway arrangement, gate distribution, etc. The following is a brief introduction to the design considerations for product ribs, hooks, nut holes, etc.
Rib design
1. When using PC or ABS+PC, the thickness of the rib should not be greater than 0.6 times the thickness of the shell body.
2. The height should not exceed 3-5 times the thickness of the body.
3. The draft angle is 0.5-1.0 degrees.
4. Guide a fillet of 40%-60% of the thickness of the Rib at the root of the Rib.
5.The distance between two Ribs should be at least 3 times the wall thickness.
Hook design
1. The snap-in size of the hook is generally 0.5mm-0.8mm.
2. The hook sinks 0.2mm from the parting surface, which is beneficial to mold manufacturing.
3. Leave a gap of 0.05mm between the hook and the slot to facilitate future mold repairs.
4. Leave a 0.3mm gap between the top of the slot and the bottom of the hook as a rebound space for the deformation of the hook.
5. It is best to make the card slot closed (as long as the wall thickness ensures that it does not shrink), and the thickness of the closed surface is 0.3-0.5mm.
6. Leave a gap of 0.1-0.2mm on the remaining mating surfaces.
7. The inclined top of the hook needs to leave 6-8mm of travel.
8. The tip of the hook is rounded with 0.1mm to facilitate disassembly.
9. The mating surface of the hook can be drafted 2 degrees independently as a disassembly angle.
10.The R-angle at the bottom of the card slot increases the strength, so the guide angle serves as a conversion area in places with different thicknesses.
Boss Design
The purpose of the Boss is to connect screws, guide pins and other fasteners or to position nuts and hot-melt columns during hot pressing. The most important principle in designing the Boss is to avoid having no support and try to connect it to the outer wall or ribs to increase the number of strength.
In addition, the thickness of the mold iron material needs to be greater than 0.5mm; the draft angle of the master mold surface is preferably greater than 3 degrees. Each additional thousandth of an inch of bite depth requires an additional degree of draft angle.
The above are some of the main points to pay attention to when designing mobile phone casing molds. For more questions about the design and development of mobile phone casing molds, you can consult our online customer service. H&G specializes in mobile phone digital product mold development and design, injection molding processing and other businesses.