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粉末冶金零件在汽车上的使用越来越广泛。由于同步器齿毂的尺寸精度、形状精度等各项技术要求非常高,在生产中毛坯的成形与整形成了最关键的工序。有一类齿毂滑块槽一端不通,外齿轮盘特别薄,轮辐部分两边深度不同,轮毂部分两端大小不同。整形时需要减少新的变形,不好控制。通过改进模具结构,采用上二下二模架压机结构,将整形芯杆安装在上中心缸上;退模时芯杆用上端面支撑,上端面面积增大,可以避免齿形变形,完成整形工序。该模具结构适宜大批量生产,具有很好的实用价值。
Powder metallurgy parts are used more and more widely in automobiles. Due to the dimensional accuracy of the synchronizer hub, shape precision and other technical requirements are very high, in the production of rough forming and shaping has become the most critical processes. There is a class of toothless hub slider groove at one end, the outer gear plate is particularly thin, different depths on both sides of the spoke portion, the two ends of the hub is different in size. Shaping need to reduce the new deformation, poor control. By improving the structure of the mold, the upper and lower two-mold press structure is adopted, the shaping core rod is installed on the upper central cylinder, the core rod is supported by the upper end surface when the mold is withdrawn, the upper end surface area is increased, the tooth deformation can be avoided and the completion Plastic surgery. The mold structure suitable for mass production, with good practical value.