Simulation Requirements: Calculate the assembly gaps G1-G6 on the long side.

Step 1 – Layup & Bonding

Place double‑sided tape (②) and back cover (①) into the fixture for shape positioning, then press them together firmly.

Step 2 – Assembly to Frame
The back‑cover subassembly is vertically mounted onto the metal frame (③) using a vision system (repeatability: 0.07 mm).

Assembly Analysis

Note on Adhesive Bonding
The flexible adhesive fully conforms to both the glass back cover and metal frame, meaning its length, width, and curvature do not affect the gap.

However, its compressed thickness after bonding directly determines the gap dimension:

•Design thickness: 0.35 mm 

•Post‑bonding compressed range: 0.33 mm – 0.35 mm

Assembly Simulation in DTAS 3D

1. Adhesive Modeling Methods

•Segmented Modeling: The adhesive is divided into virtual sections to simulate flexible‑body deformation. 

•Integrated Modeling: The adhesive and back cover are treated as a single component, with adhesive thickness tolerance applied directly to the cover mounting points.

2. Visual Alignment Method

•Edge Control: Two points per edge represent each alignment edge, controlling positioning in the X‑ and Y‑directions. 

•Vision Tolerance: The vision system repeatability (±0.07 mm) is added to edge‑matching tolerances. 

•Z‑Direction Control: Defined by the adhesive bonding points between the back cover and frame.

3. Design Tolerances

•Width: ±0.1 mm •Long‑side arc height: +0.12 / ‑0.12 mm

Step 1: Modeling Back Cover and Adhesive Bonding

Since the adhesive is flexible, DTAS 3D models it by dividing the tape into multiple segments. In this case, the tape is divided into 6 independent segments.

Each segment is bonded to the back cover using point-to-point assembly, representing tight adhesion between the tape and cover.

Step 2: Visual Assembly of Back Cover Assembly

•X‑Y Positioning: Achieved through vision system alignment (alignment points as shown). 

•Z‑Positioning: Controlled by 6 adhesive bonding points between the tape and the middle frame.

Assembly Floating Animation

Simulation Results

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