Spokes are a critical component of a car's wheel, playing a vital role in both the vehicle's safety and its visual appeal. As the automotive industry continues to evolve, the demand for higher quality and performance in spoke design has increased significantly. The challenge lies in enhancing the strength, reliability, and durability of spokes through advanced technologies and manufacturing techniques. This has become a central topic in the industry. This article explores how a section arm scanner can be used to measure the thickness of wheel spokes accurately. By implementing this method, the efficiency and reliability of thickness detection can be greatly improved, offering valuable guidance for similar part processing.
Spokes connect the rim and the hub of a wheel, serving as a key structural element that ensures the stability and integrity of the wheel. To reduce weight while maintaining strength, spokes are often designed with varying thicknesses and structures. These parts are typically made from steel plates and processed through spinning methods, followed by punching and shaping. Ensuring accurate spoke thickness is crucial, as it directly affects the strength and lifespan of the wheel. High-quality spokes not only enhance driving stability and safety but also help prevent issues caused by tire wear.
In traditional auto part inspections, measuring thickness often relies on tools like dial gauges or calipers. While these tools work well for flat surfaces, they struggle with complex geometries such as those found in spokes, especially when curved surfaces are involved. Additionally, traditional methods only capture point measurements, which may not fully represent the overall condition of the part. This makes them inadequate for modern manufacturing needs. So, how can we efficiently and accurately measure the thickness of such complex components? The articulated arm scanner offers a perfect solution.
An articulated arm measuring machine is a high-precision, portable coordinate measuring device that operates effectively in various environments, from laboratories to workshops. It can function in temperatures ranging from 0°C to 50°C and performs all the functions of a traditional fixed-coordinate measuring machine. Used across industries like automotive, engineering, aerospace, and more, it can use either a hard probe or a laser scanning probe depending on the measurement requirements. For spoke thickness, where comprehensive data is essential, a laser scanning probe is the ideal choice.
**Point cloud data scanning process**
To accurately assess the thickness of spoke parts, the first step is to collect complete point cloud data. Considering the machining dimensions and accuracy needed for spoke-type parts, the ROMER RA7525SI series measuring machine is an excellent option. If a suitable mounting tool is available, the part can be placed on both sides of the spoke to scan all data in one go. If mounting isn't convenient, hot-melt silicone can be used to fix three steel balls on the surface of the spoke. These should be positioned so they can be scanned during both sides of the process, allowing full data collection from two scans.
**Point cloud data splicing**
Using Geomagic Qualify software, the steel balls in the two sets of point cloud data are defined as spheres. One set is designated as the reference datum, and the other as test data. Using feature-based alignment, the two sets are matched and merged into a single dataset, with unnecessary steel ball data removed.
**Processing point cloud data and establishing a coordinate system**
Geomagic Qualify allows thickness analysis of scanned data, but first, the point cloud must be converted into a face format. Noise reduction is performed, edge data is retained, and after filtering and sampling, the point cloud is transformed into a triangular mesh surface using the encapsulation command, saving the data in STL format.
The bottom surface is created as a planar feature, and the center hole is defined as a circular feature. A point is selected on the bottom plane, and the center and point are used to create line features. A coordinate system is then established, with the plane as the XY plane, the line as the positive X direction, and the circle’s center as the origin.
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