As a high-efficiency metal cutting equipment suitable for processing large quantities of parts, the broaching machine is mainly used in the automotive, motorcycle, agricultural machinery, aviation and engineering machinery industries. Although the proportion in metal cutting machine tools is only 0.8% to 1%, due to its high processing size and shape position accuracy, convenient operation and maintenance, low processing cost and easy automation, the application range of the broaching machine is increasingly wide. The range also extends from general bore and flat broaching to more complex profile machining. Defect name cause Solution Annular ripples and cut scars on the inner surface of the workpiece The broach is bent, and the width of the blade on the same circumference is uneven. Offset, cutting the surface of the workpiece 1. After sharpening, the upper edge of the cutter is too narrow for casting. Iron sleeve and abrasive sand to grind out the appropriate edge 2. Calibrate the broach and then sharpen it The broaching speed is too low, and crawling occurs during broaching The broaching speed is too high and severe vibration occurs during broaching Choose the appropriate broaching speed and rough surface When the degree requirement is low, the broaching speed should generally not exceed 3m/s. The maximum broaching force during broaching exceeds 80% of the maximum tensile force allowed by the machine tool, which can cause chattering Product design, broach design and broach selection Ensure that the broaching process does not exceed 80% of the maximum tensile force allowed by the machine tool Blade sharpening and blade burrs are not removed during sharpening When sharpening, the grinding wheel should be sharp, the feeding amount should be uniform, not too large. After sharpening, the rubber or wood plate should be used to grind the teeth and remove the burrs. Partial strip scratches on the surface of the workpiece The chip on the cutter is not removed in time to continue the broaching The chips on the teeth can be removed by brush or the high pressure cutting fluid can be washed away. If the precision cutting teeth are more serious or the last few precision cutting teeth are raised, when the single side is larger than 0.03mm, the cutting curl condition will be deteriorated due to no chipping measures. 1. Fine-cut tooth wear belt needs to be removed by grinding 2. Strictly check the amount of tooth lift of the precision cutting teeth and maintain reasonable decrement The surface of the workpiece has scales Inappropriate choice of front angle Correct selection of the front angle, generally increase the front angle The hardness of the workpiece is low, generally less than 180HBS, it is easy to produce scales Appropriately increase the hardness of the workpiece by heat treatment The broach is blunt, the radius of the cutting edge is increased, and the cutting conditions are deteriorated. Timing tool change based on durability Low broaching speed Adjust the broaching speed appropriately Poor cooling and lubrication conditions Reasonable choice of cutting fluid Razor rough surface After correct sharpening, the roughness of the rake face of the broach is Ra=0.16~0.32μm. Workpiece apertures are unequal in size 1. The surface of each hole of the workpiece is thin and uneven 2. The thickness of the workpiece hole wall is not much different, but the broaching length is larger. 3. Thin wall of the hole 1. The broach blade should be sharp and reduce the pulling force 2. Workpiece broaching deformation, reducing tooth lift 3. The precision cutting teeth of the broach and the number of calibrated teeth can increase the cutting fluid casting reasonably and fully 4. It can adopt the process of pulling and then using the push knife to correct Product categories of Hex Bolts, we are specialized manufacturers from China, Hexagonal Bolts, Hex Cap Bolts suppliers/factory, wholesale high-quality products of Hex Bolts ,we have the perfect after-sales service and technical support. Look forward to your cooperation! Heavy Hex Bolts,Hex Bolts,Allen Bolt,Allen Key Bolt Kunshan Zhonggu Precision Hardware Co., Ltd. , https://www.zgfastener.com
China's broaching industry can be traced back to the “Changsha Inserting and Planing Research Institute†established by the former Ministry of Machinery in Changsha Machine Tool Plant in the 1950s. After more than half a century, the domestic broaching products have been made into self-made by imitation of the former Soviet Union products, and the enterprise has also developed from a fixed-point production at that time to a number of coexistence. It is understood that the broaching process can completely replace the traditional milling, grinding and planing processes. However, due to the slow development of domestic broaching technology, it has not been well promoted. Therefore, the broaching machine has been in the gold cutting machine. Non-mainstream status. The overall structure, auxiliary equipment and general accessories of the broaching machine still remain at the level of ordinary design, manufacturing and processing, and lack of independent and advanced scientific design, manufacturing and after-sales technical service capabilities. However, due to the constraints of domestic CNC, electrical, hydraulic, pneumatic, cooling and Other supporting components, the level of function and automation of the broaching machine is relatively low.
In addition, some product structure design is unreasonable, improper use of materials and heat treatment, imperfect detection methods, etc., also directly affect the geometric accuracy and processing accuracy of the broach itself. 