Taiwan's gantry machining center has the function of automatic tool change and can perform multiple processes such as milling, boring and drilling. It is widely used in the processing of large and medium-sized precision parts. The workbench of the large gantry machining center is very large, with dimensions of 2000mm*6000mm, the bed guide rail length exceeds 12000mm, and the workbench stroke is greater than 6000mm. It has the characteristics of accurate positioning, strong stability and small error.
Speed ??inspection of the workbench of Taiwan's gantry machining center:
1. If the forward and backward speed control handles of the gantry machining center are rotated to the right to the end, the speed cannot reach a , then the reason is: insufficient voltage rejection in the excitation circuit, excessive voltage negative feedback, etc.
2. Excessive pressure negative feedback is often caused by an open circuit inside 200-s and -F. The original voltage between 200V-SY-F is less than half of the generator voltage. , 200V-S, the voltage between the two points after the -F is opened is basically equal to the generator voltage, that is, it has increased by 2 times on the original basis.
3. During the transition process, you must pay attention to the overshoot phenomenon of the gantry machining center. During these processes, the rotation speed depends on the maximum overshoot in the process and is positioned at the IF level. For example, if the overshoot phenomenon occurs, Then we have to reduce the pressure appropriately.
4. During the production process of Taiwan Gantry Machining Center, the workbench could not be pulled. The reason was caused by positive current feedback. What is more serious is that the positive feedback of current is converted into negative feedback. phenomenon, these will cause the workbench to become unable to be pulled. Therefore, it is necessary to carefully check the feedback amount of its positive and negative levels, so that when the speed is below 10m/min, the rotation speed does not drop more than 1 level after taking the knife.
Most of the milling in Taiwan's gantry machining centers is done by up-milling. However, down milling should be used as much as possible, which will achieve better processing results. Because when the gantry machining center is up-milling, strong friction occurs before the blade cuts in, causing the machined surface to harden, making it difficult for the next cutter tooth to cut in.
When the gantry milling machine is down milling, the milling width should be approximately equal to 2/3 of the milling cutter diameter. This ensures that the cutting edge can immediately cut into the workpiece from the beginning with almost no friction. If it is less than 1/2 the diameter of the milling cutter, the blade starts to "rubb" the workpiece again, because the cutting thickness becomes smaller when cutting in, and the feed per tooth will also be reduced due to the narrowing of the radial cutting width. The result of "friction" is that the tool life is shortened. For carbide tools, it is more beneficial to increase the feed per tooth and reduce the depth of cut.
So during rough milling, if the radial cutting width is smaller than the milling cutter radius, increasing the tool feed will increase the tool life and shorten the gantry milling machine processing time. Of course, fine milling requires a smooth surface on the workpiece, so the amount of tool passes should be limited.
The work of trial-adjusting this radial milling width and determining the ratio of the milling cutter diameter to the radial milling width is best carried out on a high-precision gantry machining center so that the ratio can be observed while adjusting the ratio. Changes in surface roughness of workpiece.