The first to be overhauled and degreasing. Hydraulic valves are precision parts, dismantling the damage or lost, we must carefully analyze the works to determine the order of its disassembly, assembly mark, and make various parts and the parts to be loaded into a special box for safekeeping. Degreasing cleaning agent first, and then repeated degreasing chemical methods. Repair methods include grinding valve hole repair spool two. The measurement of the valve bore and spool with the gap, the diameter of the valve bore 50? Mm, the spool diameter is 50 mm. With the gap of the spool and the valve bore serious super Poor 0.07 ~~ 0.15mm, and the spool cylindrical degree of tolerance in the 10 to 20 μm.
1. Grinding valve hole
(1) lap
Grinding recovery valve hole geometry, the elimination of the valve hole of the taper and ovality. Made of gray cast iron material HT200 grinding, grinding tools, grinding rod structure as shown in drawings, is adjustable.
Order to be able to adjust and save the abrasive grinding rod diameter size, the grinding rod surface opened four grooves, one of which is cut through. Grinding rod hole made taper 1:20 or 1:30, rely on the cone with the matching tapered mandrel elastic adjustment of the grinding rod and the workpiece hole gap. When the tapered mandrel position deviated holes small head gyrating the grinding rod diameter size up is large, the grinding rod is RESEARCH valve bore gap becomes smaller; when the tapered mandrel toward the bulk of the inner hole in the grinding rod position, since flexibility generated by the the pestle cut through slot, so that the ground rods and ground clearance of the valve hole increases.
Order can be guided during grinding, the grinding rod depth of the valve bore a working length of approximately 3/4 of the workpiece length. The grinding rod cylinder diameter aperture ground usually 30 ~ 50μm, to accommodate the abrasive material. Pursuing a dream, good weaver of dreams
(2) Grinding
Select No. 220 abrasive paste, diluted with kerosene, applied to the pestle; ground rods fixed on the lathe, 200? R / min rotational speed, handheld Body for linear reciprocating and rotating in a pestle and appropriate places a U-turn, then grinding. Grinding to prevent the valve body due to its own weight to form an oval hole, after polishing the valve hole having a diameter of 50.5mm, the cylindrical surface of each segment of the valve hole roundness and cylindricity of not more than 5μm, the error of concentricity of the cylindrical surface of each segment not more than 1μm, the valve bore surface roughness Ra of not more than 0.8μm.
2. Repair spool
First cylindrical grinder fine grinding spool, to ensure that the spool cylindricity 5μm or less. Then degreasing, the key is to pay attention to the brush plating work layer the spool surface treatment before, can not let the groove of oil or other impurities in when brush plating into the the Brush work surface or sticky to affect the quality of the brush plating plating pen . Imported pump valve
(1) brush plating
① brush plating preparation and pretreatment. The material of the spool 35? CrMo steel, may be medium carbon alloy electrical net and activation process for surface treatment. Activation solution using the 2nd activation activation solution, and then with the 3rd in the 15 ~ 18V voltage activation uniform silver-gray, to the surface.
② brush plating underlying. As the underlying special nickel plating, brush plating first in the case of no electricity, wipe with a special solution of nickel plating pen dipped to be coated surface, which lasted 3 ~~ 5s, plated pen 10m/min speed relative plated at 15V pieces of sports, brush plating thickness 2μm.
(3) Brush work layer. According to the working conditions Fast Nickel or dense single fast nickel coating can be selected as the working layer, the diameter of the spool brush to 50.5mm.
(2) Grinding
Cylindrical grinder fine grinding spool, the spool and the valve hole with the gap reached 0.015mm.
3. Assembly test
According to the reverse order of the removal of the valve assembly, the assembly should note the following:
(1) kerosene, light diesel oil or gasoline to clean the valve member
Coated abrasive grinding clean, especially Body undercuts the valve body, the valve hole channel should be carefully examined, not residue. Air dry after cleaning, be careful not to let dry fiber on the rags and dirt adhesion on the part.
(2) Check the spool valve hole with the gap
Absence of measuring instruments, measuring tools can smear a thin layer of clean oil on the spool and carefully put it into the valve hole, the entire length of the valve hole should be flexible but not loose moving, rotating spool can maintain above state after a certain point of view, there is no arrest phenomenon can be considered qualified.
(3) Check the contact surface sealing condition
Clean kerosene injection valve hole, check the seal between the valve body, valve cover and the contact surface of the electromagnet housing does not allow leakage.
The electro-hydraulic valve installed for testing, good work, proved by users, their life expectancy has reached the level of the new valve. Brush repair costs usually only buy new valve about 1/10, and the repair time is short, high quality, can reduce losses due to downtime caused.
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