The quality of the automobile sludge model directly affects the later development of the entire vehicle, so the quality control of the automobile sludge model is particularly important. Hualang 3D engineers use the 3D photogrammetry system HL-3DP+ 3D scanner HL-3DW to obtain the 3D data of the car sludge model and compare the original CAD model with the original CAD model. They can see the overall deviation between the actual model and the CAD drawing and know clearly. The quality of the car sludge model enables the company to improve the car sludge model in time.

Practical problem

1. The traditional measurement method has insufficient data collection density (insufficient amount of data) and cannot measure the curved surface and radian on the automobile sludge model, cannot perform normal inspection, and cannot reverse mapping in the later stage.

2. The scanned automobile sludge model is 5.2m in length and 2.3m in width. Generally, the scanning area of the 3D scanner is small, and the accumulated scanning area is too much when scanning large objects. There are problems such as not being able to find the mark points and not splicing well. Problems such as large workload and low work efficiency occur, and the accuracy of the acquired data does not meet customer needs.

Holon solutions

Scanning scene of automobile sludge model

In view of the large area of the automobile sludge model, many curved surfaces, and more complex, Hualang 3D engineers proposed the use of the solution: three-dimensional photogrammetric system HL-3DP (calculates the 3D coordinate values of key information points on the surface of the sludge model) + three-dimensional scanner HL -3DW (quickly obtain high-precision three-dimensional data of the sludge model) + reverse design software Geomagic Studio (convert the point cloud data of the sludge model into triangular mesh surface data) to carry out the secondary design of the sludge model of the automobile.

1. Preliminary preparations

Spray developer: improve the contrast of the background color on the surface of the sample and obtain better scan data.

Marking points: Positioning and splicing the acquired data in the scanning software.

Paste code points: enable the 3D photogrammetry system to obtain 3D coordinate values on the surface of the object.

2. 3D photogrammetry

In view of the large area of the automobile sludge model, Hualang engineers first used the three-dimensional photogrammetry system (HL-3DP) to take multiple images of the automobile sludge model. Through the three-dimensional ranging method, the HOLON3DP software automatically combined these images after calculation. , You can get the 3D coordinates of the center of each coding point, calculate the 3D coordinates of the key information points on the surface of the object, correct the point cloud information of the large surface area, and greatly improve the overall point cloud splicing accuracy of the 3D scanner.

3. 3D scanning

Import the 3D coordinate data of the automobile sludge model into the HOLON3DS scanning system, and use the three-dimensional scanner HL-3DW to quickly obtain the high-precision 3D data of the automobile sludge model. The three-dimensional scanner has the characteristics of super large scanning format, portable design, extremely fast scanning speed, high precision and high stability. The coordination of the three-dimensional photogrammetry system (HL-3DP) and the three-dimensional scanner (HL-3DW) can correct the point cloud information of a large surface area, greatly improve the overall point cloud splicing accuracy of the three-dimensional scanner, and improve work efficiency. It only takes 1 and a half hours to obtain the three-dimensional data of the automobile sludge model, with an accuracy of 0.15mm. Using the acquired 3D data of the automobile sludge model to speed up the production of the automobile sludge model, reduce the difficulty of later data collection, provide reliable parameters to other relevant departments, and speed up the development of the entire vehicle.

Point cloud data of automobile sludge model

STL data of automobile sludge model

STL data of automobile sludge model