手扶拖拉机金属转向手把(有板材冲压件和铸铁件)是工作时主要振动、噪声源之一,且使用寿命较短。为此,我们进行改进,选用塑料件代替金属件(零件如图示)。为了适应批量生产,我厂设计了注塑模,使得零件连接尺寸与金属件完全一样,以便通用,同时为增加其耐磨程度,在两安装孔处,加了金属嵌件。经过两年多试验、使用证明,塑料手 Walking tractor metal steering handlebar (sheet metal stamping parts and cast iron parts) is one of the main vibration, noise sources, and short service life. To this end, we make improvements, use plastic parts instead of metal parts (parts as shown). In order to meet the mass production, I designed the injection mold, making the parts connected with the same size and metal parts, in order to increase its wear resistance, two mounting holes, plus metal inserts. After more than two years of testing, the use of proof, plastic hand