Modular design concept of nc machine tools

The machine is the basic equipment manufacturing overhead conveyor, its technical level directly affect the development of the manufacturing industry. Currently, represented by machining center, nc machine tool has become widely used in industrialized countries of the modern manufacturing processing unit. From the common development of CNC machine tools, is that in transmission and structure of a leap, to adapt to this, nc machine tools in its structure design and inevitable requirement has new design method and theory. Modern CNC structure design has the following characteristics:
1 nc machine tools in many independent function units, such as the guide, ball screw, cooling and lubrication, drive and control and testing devices, etc. This characteristic that the modular design method is suitable for,
2. Of CNC processing requirements to the direction of high speed and high precision. High rigidity requirement machine structure, high reliability, machine parts of the structure design of dynamic and static characteristics of the main contradiction become,
3 the transmission control overhead conveyor, with variable speed motors, instead of using a computer numerical control machine instead of the contact transmission chain modeling and to ensure the relationship between the axial movement, makes the function of machine design principle greatly simplified,
4 market competition and market demand of the products function strong requirement changeful machine, good performance, low cost, short cycle.
Function of machine and performance and cost, often conflicting and products of the total cost of the product's performance and 75% in the design stage, so should be determined by improving design to improve product quality and performance and reduce its cost. Modular design technique to solve this contradiction. In CNC concept design phase, with modular design constructed modular numerically-controlled machine tool product series, can improve the product development speed, fast response to market demands.
1 concept design system model
According to the concept design for Pahl and Beitz, in the concept design phase should make clear design, through the abstraction, functional structure, seek appropriate action principle and structure of the functional. Carrier Modular design for nc machine, various stages of the design scheme of tasks and forming process can be divided into:
1 demand analysis: in establishing the function model of the products based on user needs into user demand function,
2 function analysis, decompose: through the analysis of the machine movement, will always function decomposition level for points (or subroutine), establish the structure of nc machine tools, functional exercise function scheme,
3 structure scheme solving: through the < > mapping function, the structure of the carrier for realizing function, structure and layout according to the movement of the distribution of the structure design, layout, machine tool can also shape, size of the primary structure of planning,
4 structure dynamic and static stiffness analysis and optimization,
A detailed structure design; 5.
6 in the design of the machine, and a series of variant design in modular design of the product series, rapid response to the market demand.