Today's automobile production, new product development cycles are shorter and costs are reduced, our data show that ten years ago, a car needs four years of product development cycle; today only two years to complete. In addition to car manufacturers to adopt advanced methods of new product development, virtual manufacturing, DU bushing concurrent engineering and other advanced development of technology, thanks to a very important point is to provide manufacturing equipment for the automotive equipment supplier's efforts, Mould guide plate in particular the supply of these devices provide a variety of CNC machine tools, CNC machine tools allows these automobile manufacturers to provide the fastest products to meet market demand.
Classification and characteristics of CNC machine tools
There are a variety of CNC machine toplasic bushing ols; from the categories of points, a dedicated CNC machine tools, CNC machine tools are common; varieties from processing points, a processing shell type CNC milling machine, machining center, CNC machining shaft lathes, turning centers , Cam CNC grinding machine, etc.; from the processing requirements of control points, plain bearing a single-axis CNC CNC belt polishing machine, five linkage CNC Cutting Machine, CNC cutter grinding; from the control points on the complexity, some simple numerical control, multiple-channel digital; from the drive points, there are stepper motors, with DC servo motors, servo motors are AC synchronous, asynchronous servo mobrass bushing tors with AC, a linear motor
Points the way from the spindle drive, a DC spindle motor, spindle motor with AC, AC is the spindle; from the position feedback on the points, there is the whole closed-loop feedback, cast bronze a semi-closed loop feedback, open loop control, and so on.
Good flexibility of CNC machine tools. Height Adjustable, high precision, auto makers have long been concerned about the 1960s began to enter the auto parts production. Because of its high cost,bronze bushing functionality and efficiency of the system is not ideal, but has not been widely used. In the 1990s, along with market competition; many varieties produce best meet the various needs of the market until it meets the needs of every user, the goal of the automotive manufacturer to CNC machine tools dry bushing as the main flexible manufacturing cell, has been widely used. CNC machine tools today focus on the development direction of the two:
High-speed CNC machine tools, to achieve high efficiency at high speed. The current international standard is the spindle speed ≤ 25000rpm, add, subtract speed ≤ 2.5g,sleeve bushing fast-moving ≤ 160m/min, to achieve this new level, driven CNC machine tools, mechanical transmission, mechanical structure, to be a great tool improvement. bushing Must use the machine spindle spindle, main bearings generally use ceramic bearings, difficulty is cooling, lubrication, general service life 20,000 h. Linear motor drive plus commonly used linear rail (also useful for static rail), 90m/min, 1g of the machine is also useful for large pitch ball screw pre-tension dual program dual servo motor drive. Mechanical structure commonly used to frame structure. Tool with high hardness, high heat tool, tool holder on the handle using hsk.
Plane of the CNC machine tools or special CNC machine tools to solve the contradiction between flexibility and efficiency. Currently, most European and American automobile manufacturers use high-speed machining centers by the agile production system, which can be 100% of the mixed variety of flexible production, called the island by a number of flexible manufacturing modules, each island by more than one kind machine and the machine connected robot components, electronic storage device used with a tray and machine tool with the exchange of information. It is noteworthy that these devices not only mastered the equipment supplier's proprietary technology, manufacturing, and attach great importance to the development of automobile manufacturing process, they can provide users with turn-key projects, have their own system development capabilities. Machine reliability index is very advanced, stand-alone starting rate of 98% or more. With this production system, car manufacturers launch new products greatly shorten the cycle of industrialization.
After 20 years of reform and opening up the domestic auto parts manufacturing, numerical control machine tools more widely used. But mostly from Europe, America, Japan and imported machine tools, the characteristics of Western and Japanese machine tools are: reliability, low failure rate; emphasis on human-computer interface design user-friendly; with the active measurement and compensation systems; can provide with automatic loading and unloading device processing unit; modular machine tool design. And although many domestic manufacturers of CNC machine tools, but the variety, is still a common low-level CNC lathes are more suitable for high-volume automotive engine, transmission, chassis main parts of the multi-axis CNC machining centers, fewer species, and generally do not withstand high-volume production test.
Application and lack of
Nearly two decades, China's machine tool design modeling has made great progress, to see if the static machine shape, with similar foreign products do not see much difference, however, to adapt to the large volume of auto parts production, machine tools have a high need reliability.