3D Optical Tube Inspection for Automated Tube Bending Quality Control

Date:2025-03-27

The forming quality of conduits used in automotive, aviation, and aerospace engines directly impacts the performance of the assembled systems. As conduit forming technologies advance and automated manufacturing becomes more prevalent, standards and precision requirements for conduit inspection have become increasingly stringent.


General inspection, feature measurement, manufacturing guidance, reverse engineering, and assembly verification for bent tubes all rely on advanced measurement technologies that are efficient, precise, and convenient. Below, we present a video demonstrating the intelligent inspection of bent tubes to reveal how professional measurement applications handle tube parameters.

The XTOP3D TUBE QUALIFY inline inspection system enables real-time quality assessment during production. It can be used for machine calibration during the development of new bent-tube products as well as for 3D reverse engineering of conduits. The system supports iterative data review and delivers accurate, stable 3D reconstruction results; featuring a calibration interface and a user-friendly design, it is convenient and easy to operate.

Schematic diagram of XTOP3D TUBE QUALIFY 3D optical tube measurement system models

Based on the principles of industrial close-range photogrammetry, the TUBE QUALIFY in-line bent-tube inspection system utilizes multiple fixed industrial cameras to capture 2D images. It rapidly completes the entire inspection workflow—including data acquisition, reconstruction, comparison, analysis, and result output—within seconds, all without the need for manual intervention.


Advantages of the Bent-Tube Measurement System

Compared to traditional inspection fixture technology, the TUBE QUALIFY system employs a fully non-contact measurement method. This eliminates the risk of surface scratches, delivers higher precision and faster throughput, and removes the logistical and storage burdens associated with physical fixtures.

Compared to handheld inspection tools or standard 3D scanners, the TUBE QUALIFY system operates without any manual intervention and can measure multiple bent-tube components simultaneously. This significantly boosts inspection efficiency, representing a truly intelligent inspection solution.

The TUBE QUALIFY inline tube inspection system can measure multiple tubes simultaneously.

Key Product Features


Non-contact Vision Measurement

The only domestically developed, commercially available intelligent inspection system for pipe fittings that utilizes non-contact vision measurement, ensuring no damage to the surface of the workpiece.

Complex Pipeline Measurement

Supports the measurement of complex pipelines, flange ends, and branch junctions. It handles open-end features—such as flared ends, nuts, and protrusions—allowing for direct detection and reconstruction; adapters are available to assist measurement in cases of obstruction. It also supports stitching and segmented measurement for long pipes.

Specialized Measurement of Bent Pipe Parameters

Equipped with specialized software, the system supports bend point detection, YBC data calculation, and pipe geometry editing. It accurately assesses manufacturing deviations in bend point data (including coordinates and YBC values) and generates comprehensive, illustrated inspection reports.

Batch Online Inspection

Supports simultaneous measurement of multiple pipe fittings with high speed, increasing inspection efficiency by dozens of times compared to traditional inspection fixtures. Automated online inspection replaces manual processes, reducing human error and labor costs while vastly improving efficiency.

Guidance for Pipe Bending Processes

Supports data communication with pipe bending machines, offering real-time feedback and closed-loop control. Measurement data is fed back to the bending machine in real-time, significantly enhancing the efficiency of machine setup and process iteration for new products, while minimizing material waste.

Data Traceability and Scientific Management

Provides comprehensive storage and management of pipe geometry data, including the creation of a bending database that supports data traceability, retrieval, recalculation, and trend analysis.

Typical Application Scenarios

The TUBE QUALIFY online inspection system is suitable for three main application scenarios: reverse engineering and reconstruction of unknown pipe geometries, batch inspection of bent pipe products, and process calibration for bending machines (using feedback data to correct machine settings).

3D Pipeline Model Reconstruction

Enables reverse 3D reconstruction of bent pipe components by measuring existing physical parts to acquire 3D data. This reconstructed data can be used for pipeline assembly analysis, facilitating the safe and reliable spatial layout of bent pipe components.

The TUBE QUALIFY in-line tube inspection system is used for pipeline assembly analysis.

The TUBE QUALIFY in-line tube inspection system is used for pipeline assembly analysis.

Measurement and Analysis of Bent Tube Parameters


Utilizing specialized inspection software integrated into the system, the process compares actual workpieces against design specifications to accurately identify deviations in the bending process, facilitating quality checks on shape, bend points, and angles during inline production.

The TUBE QUALIFY in-line bent-tube inspection system is used for the measurement and analysis of bent-tube parameters.

Feedback of Process Correction Parameters to the Pipe Bending Machine


By comparing theoretical values with measured data, the system supports the output of correction parameters for pipe bending and enables direct communication with the bending machine. This facilitates compensation and guidance during part processing, effectively enhancing both production and inspection efficiency.

The TUBE QUALIFY in-line bent-tube inspection system is used to provide feedback to the tube bending machine for the adjustment of process parameters.

Segmented Measurement and Splicing for Extra-Long Pipes


Supports segmented measurement and splicing for long pipes, with customizable measurement ranges (test rig dimensions) from 1m to 8m, enabling accurate and efficient splicing during the segmented measurement of extra-long pipes.

The TUBE QUALIFY inline pipe inspection system is used for the measurement of ultra-long pipes assembled from multiple segments.

Simultaneous Measurement of Multiple Tubes


Suitable for high-volume industrial inspection, this system allows for the simultaneous checking of multiple bent tubes; a single unit replaces a large number of traditional inspection fixtures, thereby reducing production costs for the customer.

The TUBE QUALIFY inline tube inspection system is designed for the simultaneous measurement of multiple tube components.

Measurement of Non-standard and Branch Pipes


Supports the measurement of various non-standard pipes and fittings—including those with welded flanges and brackets—and offers adapter-based branch pipe measurement, ensuring accurate and reliable assembly precision for bent pipes.

The TUBE QUALIFY inline tube inspection system is used for measuring complex-shaped tubes and branched tubes.

The TUBE QUALIFY inline tube inspection system is used for measuring complex-shaped tubes and branched tubes.