Weifeng Junlong Machinery: Strict Quality Inspection Builds a Strong Line of Defense for Precision Casting

Recently, quality inspection work has been carried out in an orderly manner in the production workshop of Weifang Junlong Machinery Co., Ltd. From initial wax pattern inspection to final finished product inspection, each process is strictly controlled by professional inspectors. With the goal of "zero defects", we safeguard the quality of investment casting products, demonstrating the company’s professional strength and responsibility in the field of high-end precision manufacturing.In the key process of wax pattern forming, inspectors in work clothes carefully conduct initial inspection on newly demolded wax patterns under standard light sources. Holding vernier calipers and micrometers, they accurately measure key dimensions such as wall thickness and aperture, and rely on professional experience to check surface defects including bubbles, shrinkage depressions, cold laps and flow marks one by one, without missing any tiny flaws. For complex-structured wax patterns, inspectors also use special tools to thoroughly inspect hidden parts such as inner cavities and deep grooves, ensuring that wax pattern quality meets process standards and eliminating subsequent casting defects from the source.After entering core processes such as shell making and pouring, inspectors implement a dual mode of "process patrol inspection + key node random inspection". They shuttle between production stations, monitor key parameters such as shell strength, pouring temperature and molten metal composition in real time, and conduct sampling inspection on each batch of products. For Junlong’s main products such as petroleum cable protectors and automotive precision parts, inspectors strictly carry out multiple tests including dimensional accuracy, surface roughness and mechanical properties in accordance with industry standards and customer requirements, ensuring stable product performance and high consistency.Before finished products leave the factory, inspection enters the final "big test". Inspectors use advanced instruments such as coordinate measuring machines, ultrasonic flaw detectors and penetrant testing equipment to conduct comprehensive inspection on castings. From appearance quality to internal defects, from dimensional accuracy to material composition, each indicator is repeatedly verified. Only products that meet all standards can be labeled qualified and delivered to customers smoothly. Meanwhile, all inspection data are recorded and filed in detail, realizing full traceability of product quality."For precision casting, quality is the lifeline. Our inspectors are not only the 'gatekeepers' of quality, but also the 'guardians' of corporate reputation," said the relevant person in charge of Junlong Machinery. The company has always adhered to the philosophy of "Quality First, Customer Supreme". By establishing a complete three-level quality control system (initial wax pressing inspection – fine mold repair inspection – final tree assembly inspection), and equipping with a professional inspection team and advanced testing equipment, we ensure that every ex-factory product stands the test of the market and customers. In the future, Junlong Machinery will continue to optimize the quality inspection process, improve inspection accuracy, and provide higher-quality precision casting products to support the development of high-end manufacturing in petroleum, automotive and other industries.