As a crucial device in industrial production used for fixing, positioning, and supporting workpieces, the performance and precision of fixtures directly determine processing quality, production efficiency, and operational safety. In modern manufacturing, from aerospace and automotive manufacturing to precision electronics, fixtures are widely used in welding, machining, assembly, and inspection.
The importance of fixture inspection is mainly reflected in three aspects: First, precision fixtures ensure the stability and repeatability of workpieces during processing, avoiding dimensional deviations caused by displacement or vibration; second, regular inspection can promptly detect wear, deformation, or damage to fixtures, preventing batch quality problems or safety accidents caused by fixture malfunctions; third, with the widespread adoption of automated and intelligent production lines, fixtures need to be highly integrated with robots and conveyor systems, thus fixture inspection has become a key link in achieving quality control in intelligent manufacturing. From a background perspective, with the continuous growth in demand for high-precision machining and personalized production, fixture structures are becoming increasingly complex, and the requirements for inspection technology are also increasing, driving the transformation of inspection methods from traditional manual inspection to digital and automated methods.
Inspection of fixtures must comply with multiple technical standards: International standards such as ISO 230-1 "General Rules for Machine Tool Inspection" specify basic accuracy inspection methods, while ASME B5 series standards specify tolerances for fixture positioning elements; domestic standards GB/T 28001 "Technical Specifications for Mechanical Safety" clearly define fixture safety design requirements, and JB/T 9934-2011 "General Technical Conditions for Combined Fixture Components" refines inspection indicators. Industry-specific standards include: the automotive manufacturing industry follows the fixture management clauses in VDA 6.1, while the aerospace industry refers to NAS 979 "Unified Standard for Fixture Testing" for specific testing of high-temperature alloy fixtures. Core standard content covers: positioning element accuracy class classification (e.g., ISO 2768-mK grade), clamping force safety factor calculation (usually ≥ 1.5 times the rated load), and wear limit value setting (positioning pin diameter wear ≤ 0.02mm). Inspection agencies must select applicable standards according to the fixture application scenario and keep the standard versions updated.
