Assembly of translational motion mechanisms and methods of accuracy tests
Assembly of translational motion mechanisms and methods of accuracy tests.Assembling the mechanisms of translational motion and methods of checking for accuracy The assembly begins with the installation of overlaid guides (if any). Beforehand, landing machines must be prepared on the machine bed by grinding or by “painting”. places for false guides. Then, fixing the guides with clamps, bolt holes are drilled in the frame. Drilling is performed on the holes in the overhead guides! 0! cylinder, drill or drill. When threads are threaded in the holes, the overhead guides are attached to the machine bed by bolts with hidden races. After this, the guiding rails are started to be finished. The rails, which are integrated with the frame, are machined before going to the assembly (planing or milling). If the shells are detected during machining on the molded cast iron station, the last ones are brewed by the gas cylinder, and the coke is closed in a cold way. A hole with a thread is drilled in place of the drill with the thread in which the pin is screwed. Before the scraping 113rOT0, the lubricating grooves are formed, they are manually or by a mechanized tool on the preliminary marking.Then the grooves are cleaned with a curved circular file.Shabren, it is necessary to locate TI, rop i 130 at a level according to the level of the saber plate and the verification sheet It is common to accurately match the penetrating machine bed, the rails of which must be scraped from the beginning to remove traces of machining.  A simple scraping of short guiding lines. The spiral of the working surface of the sizing plate must be a scraping of long guiding bars that do not overlap with a straightedge or In several places on the rails with the help of the slab shabriat small areas with the expectation that they overlap the verification line ykoi. The calibration ruler, installed on two adjacent beacons, must be located horizontally, which is controlled by level. Sites between the beacons shabryat in the usual way, until the whole surface is directed | The distribution of staples is not covered in sufficient amounts by the “distributed spots”. Using the increased accuracy after roughing, rubbing paste M1, GON with a moving part (table or machine support) .In view of Toro, scraping is an extremely laborious operation, it is necessary, where possible, to replace it by grinding. After finishing, the guides are checked for accuracy. “Parallelism of flat guides is checked by special indicator bridges” (see (In 82, a 11 6) .The body / bridge has a groove along which ne to mix the stop 2 of the measuring lever 3 is connected to the rod 4 of the nidikator 6, the reinforcement of the prisoner on the stand 5. The indicator bridge is moved along the control and the deflection of the arrow of the indicator is judged as to the degree of n-parallelity Figure 82.6 shows the scheme for setting the indicator bridge when checking the parallelism upper guide rails Straightness of the short guides, overlapped by a straightedge, is checked for clearance or by using a feeler, in other cases you can use the level. At the same time, in whatever direction the level is set, the displacement of the level bubble should not leave the permissible limit. The most accurate methods are checking for a straight line by an optical device with a green mark, as well as with a microscope. The device of the basic chain is stretched
trol instruments used in checking the guides for accuracy, detailed in 143 the accuracy of the guides is determined by a portable impact device. The steel hardened ball, reinforced in a special mandrel, is pressed into the test material by the force of impact of the striker The softer the effect on the larger
depth, the ball melts, the greater the diameter of the print. Measuring the value of the latter, the hardness is determined from the transfer table <diameter of the print – hardness “. The device is quite accurate weighs only about 6 kg and is easy to use; it allows you to determine the hardness of the part in any position. You only need a mouth. to push the device perpendicular to the surface of the product, the hardness of which is required to be determined. The quality of scraping or lapping is checked by special instruments or by comparison with the standard. The density of the sliding parts to the guides is determined by the “no paint” noise or by the lumen.