The main processing technology of this process is the boring of the bearing hole, the milling of the G, H and the side of the gear and the drilling and tapping of the joint holes on each side. The special fixture (Fig. 3) of this process is mainly composed of a pressure plate 1, a backing plate 2, a positioning pin 3, and a bottom plate 4, and is fastened and fastened to the 02 table. The specific use method is as follows: the C-base plate processed by the workpiece is placed on the backing plate 2 of the special fixture of the No. 02 workbench, and the two positioning pins 3 on the jig are used as the positioning reference to insert the workpiece on the upper process. In the F hole, since the shape accuracy and dimensional accuracy of the two F holes are high, the workpiece can be accurately positioned on the jig, and the four bolts on the pad 2 are matched with the remaining four holes, and the nut is tightened. In order to improve the clamping rigidity, the workpiece is pressed by the four pressure plates 1 on the clamp, so that the workpiece is firmly fixed on the clamp. The corresponding machining program is called up, and the machining elements of the box process 2 can be processed by executing the program. When the fixture is redesigned, it is strictly ensured that the center of the fixture and the side reference are consistent with the center of the table and the height of the side reference. The center of the two positioning pins can be regarded as the center of the table. By using two positioning pins for precise positioning, the workpiece is clamped. After that, the center of the workpiece and the center of the worktable are basically coincident, and the workpiece does not need to be corrected after the installation, thereby improving the positioning accuracy and processing efficiency of the workpiece. The process has three working planes. Therefore, the workpiece coordinate system is determined as G56, G57, and G58, respectively. Since the box is basically a symmetrical structure, the X coordinate is preferably selected from the center of the workpiece, and we will take the X-axis coordinate. The value is taken as the second reference point of the machine tool, that is, the position corresponding to the center of the spindle and the center of the table. The X coordinate value is 625mm (that is, 1250mm in general), and is input into the above three coordinate systems respectively. The Y-axis coordinate value is the center of the φ150 hole on the workpiece. For the reference selection, the Z-axis coordinate values ​​are also determined by the trial cut method and input into the corresponding coordinate system. 6 Programming The machining center has an automatic tool changer, which can automatically complete milling, drilling, boring, reaming, tapping and other processes in one workpiece clamping, with high productivity and quality stability. In order to give full play to the high efficiency and versatility of the machining center, attention should be paid to the division of the process and the rationality of the process in the design of the machining program. It is directly related to the use efficiency, machining accuracy, tool quantity and economy of the machining center. As far as possible, the process concentration, the shortest process route, the machine pause time and the auxiliary time are the least. When designing the program, a tool change should be taken as a step, and the processing content and the size requirements to be guaranteed should be indicated. The M01 command is added between the step and the step, and is used together with the OPTION-AL STOP switch on the machine. The machine stops after the tool change, and the accuracy of the tool change can be verified to fully verify the program. The OPTIONAL STOP switch is turned off and the program continues to operate in continuous mode. When roughing the plane, the machining allowance is large, and the workpiece will have a large thermal deformation. The coarse and fine milling should be separated to allow the parts to be sufficiently cooled. When designing the drilling program, the machining accuracy requirements of the hole should be considered. For the hole machining with normal accuracy requirements, the center drill can be used without pre-drilling. In view of the tapping after drilling, the position of each hole can be programmed into a subroutine, and the M98 command can be used to call the main program, which can be easily reused, and the coordinate error during the editing can be reduced. In the case of machine power, the screw holes are all rigid tapping to improve machining efficiency. When boring, when using a single-edged boring tool, there are several problems to be noted when compiling: First, when manually loading the tool at the spindle position, the spindle should be handed first with the M19 command, and then the tool tip is facing inwards. (ie, back to the operator) to install; Second, when using the G76 command, the corresponding Q value should be set. After the boring is completed, the spindle will move in the opposite direction of the tool tip to locate the value (Q) value. When the tool is scratched, the surface of the hole can be avoided. Since the coaxial precision of the symmetrical holes of the workpiece is required to be high, when the boring is performed, the holes on both sides should be adopted in the form of no turning head. If the diameters of the holes on both sides are the same, you can use a knife to complete the machining of the holes on both sides. If the apertures on both sides are different, you can first drill a hole with a large hole in the machining program, and then change the tool (symmetric The fine boring tool of the hole hole), the worktable does not change position, and the X and Y coordinates of the big hole are used, and the appropriate Z coordinate is set, so that the file extends straight from one end of the large hole, and the small hole of the other side is completed. Boring. In this way, since the same plane coordinate system and the same spindle coordinate are used, the error of the turning of the turning head is eliminated, and therefore, the machining accuracy of high coaxiality can be ensured. There is a premise to adopt this method: the spacing between the two holes should not be too large, otherwise the arbor will be too long, which will cause vibration during processing and affect the machining accuracy. The general design principle of the machining program is: following the principle of coarse and progressive, first roughing and heavy cutting, removing most of the machining allowance on the blank, and then arranging some parts with low heat generation and low processing requirements, so that the parts are in There is sufficient time for cooling before finishing, and finally finishing. The machining sequence of the workpiece is: rough milling plane - drilling - tapping - rough boring - finishing - fine boring. 7 cutting amount selection When roughing, under the conditions of rework system rigidity and machine power, choose a larger cutting depth and a higher feed rate. Generally, the cutting depth is 5-6mm, the spindle speed S is 200-300r/min, the spindle moving speed F is 300mm/min in the rough milling plane, and the spindle moving speed F is 200mm/min in the rough boring. Obtain better shape accuracy and surface roughness, the cutting depth can be smaller, generally choose 0.3-0.5mm, the spindle speed S is 300-450r/min, and the precision milling plane spindle moving speed F is 220mm/min, fine processing The spindle moving speed is 100-150mm/min when the hole is drilled; the spindle moving speed is 300mm/min when drilling; the spindle moving speed during tapping is the spindle speed multiplied by the pitch, which cannot have a decimal point. 8 tool selection The face milling cutter and the boring tool are selected from the machine clamp to be indexable, and the blade material is cemented carbide or coated blade. Internal and cold carbide integrated tools are used for the drill bit and tapping. When the two-sided symmetrical hole is processed by the non-adjusting method, the long arbor can be combined according to different needs according to the modular shank and the shank system. At the same time, in order to reduce the vibration during cutting, the heavy metal damper should be used. Rod or damping damping bar. All tools in the machining center should use standard tools from the international standard. Tool specifications, special tool codes, and the contents of the tool to be machined should be recorded in a list for use in programming. At the same time, all tools used in the magazine must be tested with the tool setter and the data entered into the tool offset value in OFFSET. From the perspective of cost performance, due to the large blank volume and low processing precision during roughing, domestic tools such as rough milling cutters and rough boring tools are used as much as possible. In order to improve the cutting efficiency and obtain better surface quality during finishing, the brand of the tool can be selected from famous brands such as Iskar, Kenner, Walter and Sandvik. 9 Conclusion The processing center is used to process the box. After mass production, the processing time of each workpiece is about 2h, which is only 1/6 of the past processing time, and the processing efficiency is greatly improved. In addition, due to the guarantee of the precision of the machine tool, the joint marks are completely eliminated, and the coaxiality between the bearing blocks is also effectively guaranteed, so that the processing quality of the transmission case is significantly improved, and the fixture design is simple. Practical, easy to use, and achieved good application results. Previous page The corridor area is a large flow of people in the wet market and the ground is vulnerable to wear and tear, so it is particularly important to choose a suitable pvc floor mat. This hollow design of the hollow Non Slip Mats is very suitable for the corridor area of the wet market. The following is a brief introduction to the hollow Anti Slip Pvc Floor Mat. 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