Abstract:In order to machine an end face of engine cylinder body,a horizontal rough milling machine was designed.According to the structure of engine cylinder body and the characteristics of the machining parts,locating surface and clamping position were determined;in accordance with the machining precision and material of the cylinder body,the types of the milling cutter and motor were determined;based on the force,the clamping way of the fixture and the positioning way were determined,then reasonable clamping force was calculated.To fit more and more fast updating for products,it was important to shorten the process and improve the machining accuracy,and interchangeable parts were chosen to reduce cost and increase revenue.