The housing of automobile headlamps accounts for a considerable proportion among auto spare parts, and its quality affects the appearance and service performance of automobiles. A well‑known auto‑parts manufacturer needs to obtain 3D data of automobile headlamp housings for product structural design and subsequent quality inspection.

1. The client required quick acquisition of a 3D model for an automotive lamp housing. The lamp housing features complex curved surfaces with numerous concave and convex faces, which posed great difficulties for scanning work.

2. Conventional measurement methods (such as CMM, 2‑D measuring machines, and calipers) can only capture partial data of the automotive lamp housing. The curved sections cannot be measured, resulting in incomplete acquired data. This makes secondary design and improvement of the automotive lamp impossible.

On‑site scan image of automobile headlamp housing

The housing of a traditional automotive headlamp is designed concurrently with the vehicle body to complete the 3‑D model for whole‑vehicle assembly. Stamping dies need to be manufactured for the vehicle body, and injection molds for the vehicle lamps. After different molds are fabricated, mold trial runs and assembly are carried out, followed by respective mold modifications. This process requires matching between the lamp housing base and the lamp unit. In other words, there are two sources of uncertainty, which extend the revision cycle and raise manufacturing costs.

Technical engineers at Holon 3D used the HL‑3DS+ industrial 3D scanner to quickly scan the automotive headlamp housing and obtain high‑density point cloud data. With professional reverse‑engineering software, the point cloud data was then converted into triangular mesh surface data. By performing comparative analysis against the digital model drawing of the automotive headlamp housing, errors and defects on the headlamp housing can be rapidly detected. Compared with conventional inspection methods, Hualang 3D effectively solves enterprises’ technical challenges and improves their production efficiency.

STL data drawing of automobile headlamp housing

Comparative Analysis Diagram of Automobile Headlamp Housings