Truck crane telescopic cylinder piston rod ( pole ) grinding prone waste, according to our experience , the following waste prevention measures .
1 point for each piece carefully measuring the amount of remaining mill Should be based on the workpiece bending , deflection , dislocation and marks and other data to determine whether the grinding depth .
( A ) grinding the remaining portion of not more than 0.50mm to measure carefully by the operator yaw , bending , dislocation, marks and other values ??. Stay of less than 0.20mm for grinding workpiece must consult the relevant consent after grinding. ( 2 ) If the amount of deflection or bending over a third of the amount of wear to the alignment portion after grinding.
( 3 ) measuring the diameter of the dislocation sites on both sides of the yaw data and data on both sides , can grind money minus the minimum diameter of the largest parts of the yaw yaw value , the difference is the actual number of mill capacity . Such as: the amount of dislocation of the mill is the smallest diameter 0.40mm, the largest part of the yaw yaw is 0.30mm, the amount equal to the actual grinding 0.40-0.30 = 0.10mm, grinding volume has very little is likely to occur in the grinding burn conditions, resulting in waste .
( 4 ) marks the site of the deep , before grinding rasp is best to use the local symmetry points ( the most serious bias site ) filed a two symmetrical facets , by filing off the site to be measured. If, after subtracting the measured diameter is smaller than the diameter of the marks 0.20mm, should consult before grinding.
2 . Properly handle grinding burns ( 1 ) according to the aforementioned requirements before grinding can check after grinding , if the coarse spark large , there is a local burn , but when after two reciprocating grinding burn site can not be eliminated, subject to a workpiece deflection values measurements. If the yaw values ??were lower than the preceding mill limit , should be straightened . Through the alignment is still not eliminated, must be scrapped .
( 2 ) should pay attention to changes in grinding sparks , once burned , artifacts appear Serve waste. Special minor burns , if the value is less than one-third of measuring deflection amount of grinding , you can continue grinding ; That should be scrapped when more than a third .
Model burns cause and wheel , workpiece material also has a relationship . Preventive measures are timely repair wheel, adjust the amount of feed ( coarse or fine grinding time , if the amount of feed is too small will produce minor burns ) , add enough coolant and adjust the workpiece and wheel speed .
3 Carefully observe the spark Once the grinding sparks too large , they should immediately retract . After coarse grinding sparks when all should have discontinuities , if the deflection off the fire site more than a quarter of the value of the amount of ground to be straightened . Near the ends of each piece wheel sparks gradually increased , the top should be checked whether the temperature is too high, if the temperature is consistent with the work required to the top end of the top tight look . If a spark through the bracket becomes larger, it indicates that the top part of the bracket is irrational, so where the temperature rises . Nor should the presence of grinding sparks intermittent elephant , if severe fire off what should be measured amount of yaw and grind , grinding it up when more than one-quarter mill deflection amount .
4 . Strictly control the quality and precision machining Its diameter measured value of each point is inconsistent, and tailstock bracket respond timely adjustments.
( 1 ) through coarse , half grinding, cylindrical workpiece should not exceed the difference . If there is a fire breaking phenomenon ovality tolerance of the site, which should be measured yaw value , if this value exceeds 30μm straight after school is required to re- test mill ; After several feed grinding , in the amount of feed than 50μm, sparks will no longer off the fire , which measured ovality should be zero ; If the measured ellipticity still exceeds its tolerance , you should try again after grinding wheel dressing , if ovality still not eliminated, the top hole should be checked for damage , injury research ( In this case the surface showing polygonal ) . ( 2 ) presents a polygonal surface after grinding and finishing measures reason : If wheel has been blunt , should be trimmed ; If the wheel has a noticeable vibration , balance should be adjusted ; headstock , motor frame isolation facilities have been damaged, must be repaired ; If the workpiece itself excessive vibration should be properly slow down ; top too tight or too loose , the required adjustments. ( 3 ) the appearance of the surface of a large spiral if coarse , the reason is a bad dresser , even when the grinding wheel dressing must , must not have obvious single corner sparks , grinding wheel after a blunt surface prone to large spiral .
( 4 ) When grinding , the workpiece often appear nap , scratched and dirty coolant phenomenon . To prevent this phenomenon , the new wheel should be finishing with a wire brush to brush a few times ( to safety ) .
( 5 ) grinding the workpiece phenomenon appears when the taper , a drum -shaped, saddle-shaped , larger or smaller diameter at both ends , the carrier shall be adjusted , the tailstock , the workpiece and the grinding wheel overtravel stop at both ends of the number wheel and the workpiece time .
5 . Strictly control the temperature of the two top positions Changes can be judged according to the temperature of the top two leading tightness is reasonable ; generally top temperature slightly higher than the temperature of the workpiece as a standard .
(1) Two top high temperatures reasons: First, the top too tight, the top two are different and the workpiece center hole heart. If the top too tight, first loosen the top, add the butter to the two center hole and then adjust the tightness of the top.
(2) If there is a top temperature is too high, then the top with different workpiece center hole heart.
(3) when the two leading line temperature and the temperature of the workpiece, the workpiece will not be a polygonal two phenomena, the spark and uniform, then continue grinding. If the workpiece two Duoleng phenomenon occurs, what should be a tight top, if the work does not burn, you can wear them all. When the workpiece two spark uneven, what matters about the tail tip.