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Mobile phone structural design tolerance specification

2013-09-29
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Mobile phone structural design tolerance specification Mobile phone structural design tolerance specification (design section) Contents: 1. Engineering plastics part 1) Brief introduction of engineering plastics and common materials 2) Design size tolerance specification 3) Position tolerance points 4) Surface roughness requirements 2. Sheet metal materials 1) Common sheet metal materials for mobile phones 2) Sheet metal tolerance requirement table 3. Silicone tolerance requirements (silicon) 4. FOAM material size requirements Section 1: Engineering plastics In plastic products, the factors that affect the precision of molded parts are very complex. The first is the mold manufacturing accuracy and wear during use; the second is the fluidity of the plastic, its own shrinkage rate, and the inconsistency of each batch of molding conditions, etc., which can cause dimensional instability of plastic parts. In our design field, common engineering plastics are: ABS, ABS+PC, PC, PMMA, SILICON, EVA, PVC and transparent ABS, POM, etc. Transparent ABS is not used very often. Based on our past experience, we will form a design specification for our internal tolerance. This specification is actually derived, and the size tolerance is higher than the national standard. See the table below (unit: MM) | | |Accuracy grade||Engineering plastics|Nominal size| || | |1 |2 || | |Important size|Non-important size|| |~3 |0.04……

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