In the processing of metal pipe fittings, due to the limitations of the workpiece structure (such as narrow internal corner space and irregular external corner shape), internal and external corner chamfering is prone to problems such as uneven chamfering, angle deviation, and burr residue. It is especially more difficult to process special-shaped pipe fittings and thick-walled pipe fittings. Combining Dexing Machinery's years of technical experience, the following solutions can be adopted: First, select special tools and tool rests. For internal corner chamfering, use retractable special internal corner tools or elbow tools. The tool head can go deep into the narrow space inside the workpiece to avoid interference with the inner wall of the workpiece; select cemented carbide tools to improve cutting performance and ensure smooth internal corner chamfering. For external corner chamfering, customize forming tools according to the external corner shape (such as right angle, arc, special shape). The tool rest adopts an adjustable angle design, which can accurately adapt to different external corner chamfering needs; for the external corner of thick-walled pipe fittings, adopt a step-by-step cutting method, first rough chamfering to remove most of the allowance, then finish chamfering to ensure precision, reducing tool load. Second, optimize equipment processing accuracy and stability. Select a chamfering machine with a high-precision servo control system, which can accurately control the tool feed trajectory and cutting speed, avoiding chamfering defects caused by motion deviation; the equipment is equipped with a high-rigidity spindle to reduce vibration during cutting and improve the surface finish of chamfering; adopt a high-precision positioning device to ensure that the workpiece does not displace during processing and ensure the consistency of internal and external corner chamfering. Third, improve processing technology and auxiliary measures. For internal corner chamfering, reasonably adjust cutting parameters, reduce feed rate, increase cutting times, avoid burr residue caused by excessive single cutting amount; use a high-pressure cooling system to accurately deliver cooling fluid to the internal corner cutting area, reduce tool temperature, and wash away cutting chips to avoid chip accumulation affecting processing. For external corner chamfering, use fixtures to accurately position the workpiece, and add auxiliary support for special-shaped external corners to prevent workpiece deformation during processing; if there are still burrs after external corner chamfering, an automatic deburring device can be matched to realize integrated processing of chamfering and deburring. Fourth, strengthen technical training for operators. Improve the proficiency of operators in tool installation, parameter adjustment, and equipment debugging, and accurately set processing parameters according to the internal and external corner structures of different workpieces; establish a process parameter database, accumulate processing experience of workpieces of different materials and structures, and realize rapid production change and precise processing. Dexing Machinery can provide customized equipment and process solutions according to customers' specific internal and external corner chamfering needs, effectively solving various chamfering difficulties.