High-speed feed system based on parallel (virtual axis) mechanism:
Conventional machine tools work in Cartesian coordinates. The most typical layout of this type of machine tool is to mount the workpiece on an orthogonal table to realize the movement of the X and Y axes; to install the spindle components on the column slide to realize the Z axis movement. The total mass of the moving part (workpieces, fixtures, worktables, etc.) of such a machine tool is large, and the drag generated by the multi-layer guide rails makes it difficult for the machine tool to achieve a very high feed rate and acceleration. In addition, the traditional machine tool is a series system, which has many components and complicated structure, and often has cantilever parts and joint gaps. Therefore, it is difficult for the machine tool to obtain high rigidity. The emergence of parallel (virtual axis) machine tools has opened up a new way to solve the above problems.
Each rod is driven by a ball screw or a linear motor to adjust and control the different lengths of the six rods (real axis), so that the tool on the spindle can move 6 degrees of freedom, and it is installed on the fixed work Workpieces on a table (not shown in the figure). This structure was proposed in the 1960s, but since all six real axes that affect the main shaft must be moved, the calculation is extremely complicated and there was no way to produce it at that time. Only when CNC technology is highly developed today, the application of parallel machine tools has become possible, and a variety of design solutions have emerged. The main advantages of this parallel mechanism feed system are as follows:
(1) High feed rate At the same motor drive speed, the space parallel mechanism can obtain a higher feed rate than the conventional machine tool's series mechanism. The parallel machine tool does not have a work table and its supporting parts that move along the fixed guide rails, and eliminates the frictional resistance of the guide rail pair, which is favorable for the further increase of the feed speed.
(2) High acceleration The workpiece on the machine is fixed and all coordinate movements are performed by a 6-pole electric spindle. The mass of the moving parts is small, and the driving force of the tool is the combined force of the six rods, so the driving force is large, and it is easy to obtain a high feed motion acceleration.
(3) Stiffness The drive rod is not only the transmission component of the machine tool, but also the support component of the spindle unit, reducing the connection link and transmission gap of the "machine tool-tool-workpiece" process system, and canceling the cantilever structure of the conventional machine tool. The bar is only subject to bending moments, which greatly increases the overall stiffness of the machine. This parallel feed system also has the following disadvantages: There are more axes and six axes are required for linear motion. Therefore, the programming is more complicated and the operation is not intuitive. The length of the six rods has a large effect on the machining accuracy due to thermal deformation. Therefore, the current machining accuracy is not too high; the effective space for processing is not commensurate with the proportion of the machine tool itself, and it also limits its processing capability. All these problems have yet to be resolved.
Rail Vehicle Assembly Parts
This type of product is mostly used in the interior or under the rail passenger car. Its main function is to assist in the installation of structural components. Most of them are small parts, which are indispensable for the installation of structural components. Although the size is small, it has a huge effect. Most of these products are made of metal materials of the same level as the structural parts. The processing technology is mature, the materials are thick, and the size is strictly produced according to the standards required by customers. The size and style can be changed as needed. , process according to the drawings, and design can also be provided on demand.
Jilin Zexin Industrial Development Co., Ltd. was founded in 2001 with a registered capital of 5 million RMB and is a high-tech enterprise in Jilin Province. There are about 100 employees, and the company's sales volume reached 20 million RMB in 2022. The company has more than 30 sets of various equipment including 2 NC laser cutting machines, 6 NC machining centers, 8 welding machines for different purposes, NC cutting machines, NC bending machines and others. After more than 20 years of construction and development, it has formed a comprehensive enterprise of electrical system, carbon steel, stainless steel and aluminum alloy stamping, welding, machining and surface coating. The company has passed the ISO9001:2015 quality management system certification, EN15085 CL1 welding system certification, American standard AWS welding certification, and ISO/TS22163:2017 quality management system certification. It is a high-quality supplier cooperated by CRRC Changchun Railway Vehicles Co., Ltd., the core manufacturer of China's urban rail transit equipment and high-speed train.
Rail Vehicle Assembly Parts,Railroad Truck Parts,Adjusting Camber Bolts,Adjustable Deadbolt Strike Plate
Jilin Zexin Industry Development CO., LTD. , https://www.jilinzexin.com