The sunroof frame is a critical structural assembly that dictates both cabin sealing and mechanical smoothness. Our fixtures are engineered to provide a rigid, high-fidelity reference environment for large-span panoramic frames. By simulating the actual roof curvature and mounting stresses, we help Tier 1 suppliers eliminate rail misalignment and water leakage risks, ensuring every sunroof module operates with silent, synchronized precision from the first prototype to mass production.
Large-Span Engineering & Kinematic Alignment
Inspecting large sunroof frames requires managing significant thermal expansion and structural flexibility. Our fixtures utilize a Reinforced Stress-Relieved Steel Base combined with a high-precision aluminum honeycomb or resin nesting system. We focus specifically on the parallelism and planarity of the guide rails, using digital indicators to verify tolerances within ±0.05mm. By integrating multi-point clamping that mirrors the vehicle's body-in-white (BIW) mounting sequence, we ensure that the frame maintains its geometric integrity under simulated assembly loads, securing the perfect "Gap and Flush" interface with the roof panel and interior headliner.
Attribute
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Feature Category |
Implementation Standard |
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Component Focus |
Panoramic Sunroof Frames / Sliding Rail Assemblies |
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Base Structure |
Heavy-Duty Welded Steel Frame (Vibration-Dampened) |
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Datum Accuracy |
Locator Pins ±0.03mm / Bushings ±0.05mm |
|
Rail Parallelism |
Controlled within 0.05mm over 1000mm Span |
|
Surface Profile |
CNC-Machined 3D Contours (±0.1mm Accuracy) |
|
Clamping Logic |
Sequential Toggle Clamps (Simulated Vehicle Torque) |
|
Validation Standard |
Full CMM Traceability & GR&R Certified |
Comprehensive Inspection Coverage for Critical Features
Manufacturing Expertise & Global Delivery
Engineering Precision for the Next Generation of Panoramic Mobility
Proven durability for high-precision, large-format automotive tooling.
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15+Years of Experience in Large-Frame Fixture Engineering
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450 +Sunroof & Roof-System Projects Delivered Globally
FAQ
Q: How do you prevent the large sunroof frame from sagging during inspection?
A: We use a "Multi-Point Support" nesting strategy. The fixture is CNC-machined to follow the part's exact CAD profile, providing continuous support along the structural ribs. This eliminates gravity-induced deflection, ensuring the measurement data reflects the part's true manufactured state.
Q: Can this fixture detect the parallelism of the dual sliding rails?
A: Yes. We integrate specialized "Slide-Block Mandrels" that travel through the rails. This allows you to verify not just the static points, but the functional consistency and parallelism across the entire length of the sunroof travel.
Q: How do you handle the thermal expansion of a 2-meter long fixture?
A: For large-format tools, we utilize materials with low thermal expansion coefficients and incorporate "Compensated Datum" designs. This ensures the fixture remains accurate even if your quality lab experiences slight temperature fluctuations during different seasons.
Q: Is it possible to check the mounting hole coaxiality for the drive motor?
A: Absolutely. We use precision-ground "Go/No-Go" pins and concentricity gauges at the motor mounting interface to ensure that the drive system will align perfectly without binding or excessive noise.
Q: Does the fixture simulate the curvature of the roof sheet metal?
A: Yes. We can design the fixture with "Peripheral Environment Blocks" that represent the mating roof skin. This allows for a comprehensive "Flush and Gap" check along the visible transition zones of the panoramic glass.
Q: How do you protect the sealing surfaces from damage during loading?
A: All contact areas for rubber seal tracks are made from non-marring polymers (like POM or PEEK). The entry points for locators are chamfered and polished to ensure smooth loading without deforming the thin-gauge metal or plastic.
Q: What is the process for re-certifying such a large fixture?
A: Every fixture is supplied with a set of "Master Benchmarks" and a CMM map. Your team can perform a quick check using a portable laser tracker or arm, or we can provide onsite re-certification services to maintain IATF 16949 compliance.
Q: Can you accommodate design changes (ECO) for the rail length or mounting points?
A: Our fixtures use a "Modular Insert" philosophy. If the rail design or a mounting bracket changes, we only need to replace the specific CNC-machined block rather than the entire frame, saving you significant cost and time.
Types of Fixture
- Welding Fixture
- Checking Fixture
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Welding FixtureAchieve precise alignment and repeatable welding results with our welding fixtures. Designed for stable clamping and accurate positioning, they reduce distortion, improve weld consistency, and support efficient production in both manual and automated lines.
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Checking FixtureOur checking fixtures are designed to ensure accurate dimensional inspection and consistent quality verification for automotive components. From stamped parts to complex assemblies, we provide reliable inspection solutions that support GD&T validation, improve repeatability, and reduce production defects.
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