How to determine the process plan of vertical machining center manufacturers
Vertical machining center manufacturers use three-axis two-linkage, generally can achieve three-axis three-linkage. Some can be controlled by five axes and six axes. The height of the vertical machining center column is limited, and the processing range of the box type workpiece is reduced, which is a disadvantage of the vertical machining center. However, the vertical machining center has convenient workpiece clamping and positioning; the cutting tool movement track is easy to observe, the debugging program is easy to check and measure, the problem can be found in time, and the shutdown processing or modification can be performed; the cooling condition is easy to establish, and the cutting fluid can directly reach the tool and the machining surface; The three coordinate axes are in agreement with the Cartesian coordinate system, and the sense is intuitive and consistent with the pattern viewing angle, and the chips are easily removed and dropped to avoid scratching the processed surface. Compared with the corresponding horizontal machining center, the structure is simple, the floor space is small, and the price is low.
The principle of the vertical machining center manufacturer to determine the process plan is:
1 Reasonably arrange the aging process to eliminate various stresses of the headstock and ensure the accuracy and stability of the headstock.
2 Correctly arrange the roughing and finishing processes, and make the machining errors caused by roughing as much as possible corrected by semi-finishing and finishing.
3 Make full use of the processing performance of horizontal machining center machine tools, minimize the process turnover of parts and improve efficiency.
4 Reasonably arrange the finishing process to ensure the stability of dimensional and shape tolerance after machining.
The key parts of the vertical machining center manufacturer adopt symmetrical design, and according to the dynamic analysis, reasonable reinforcement is adopted to ensure that it has good resistance to twisting and bending, and has good precision stability. The vertical machining center can mainly divide the type according to whether the column moves or not.
(1) Fixed column type
1) The cross table type layout is similar to the single-column vertical coordinate boring machine or the cross table type CNC vertical drilling machine, which is suitable for multi-step processing of cover parts with small height and small size.
2) The cross truss type headstock moves X and Y in the driving or truss, and the main shaft ram moves in the Z direction. Suitable for multi-process machining of small and medium-sized parts with small heights.
In the processing of the headstock, the vertical machining center arranges two vibration aging effects to fully eliminate the stress generated during casting and the residual stress generated during the machining process, prevent deformation and cracking of the casting, and ensure the size and shape of the spindle box after processing. The stability of the bit tolerance. During roughing, the deformation due to vibration aging is not large. Considering that the machining of the headstock is batch processing, multiple parts are installed at the gantry milling machine or the gantry plane at the same time for roughing, and the roughing around and the rail surface are 3 mm. The rough spindle hole on the horizontal trampoline has a single side of 3 mm.
The hard rails installed parallel to the sides of the vertical machining center provide auxiliary shock absorption and support, wear resistance and long service life. The two parallel rails installed in the middle ensure that the machine is light, rigid and high precision. The line rail ensures the straightness of the movement, does not produce wave patterns, and guarantees accuracy under high-speed displacement.
The vertical machining center is driven by a servo motor, which makes the tool change fast and smooth. The flat magazine structure makes the overall tool magazine weight distribution even. Lightweight and simple structural design. Effectively reduce the probability of failure and easy maintenance. The distance between the machining point of the program and the intersection of the two rotating axes can be avoided. The curvature error of the rotating shaft is easy to compensate for the three-axis movement error. To ensure the stability and accuracy of the machine.