The mechanical Precision Honing tube leak is a reason, such as the reliability of the hydraulic system, depends largely on the design of the hydraulic system seals and seals option due to irrational use sealing structure design, the seal is not selected normative, not taken into account in the design of hydraulic oil is compatible with the type of sealing material, load, ultimate pressure, the size of the operating speed, and changes in the ambient temperature. These are, in varying degrees, directly or indirectly caused by the hydraulic system leak. In addition, the use of construction machinery environments with dust and impurities, so in design to the appropriate choice of dust seal, to prevent dust and other contaminants into the system damaged seals, oil pollution, resulting in leakage. Designed to take into account the geometric accuracy and the moving surface roughness is not comprehensive enough and did not make the connection in the design part of the strength check, these will work in the mechanical cause leaks.
Precision Honing the engine machining processing of the following ways: ( A ) the surface of the cylinder bore Compressed gas cylinder bore is burning and swell space , and play the guiding role of the piston , the cylinder bore surface is The most serious engine wear one of the surfaces , which determines the engine overhaul period and life. Cylinder bore honing is the final finishing step , after honing textured surface with a cross , is conducive to Run Oil storage and oil film retention , and has a high support rate , able to withstand greater loads , abrasion resistance, Long service life. 2 the crankshaft hole honing The main crankshaft of the engine moving parts , The quality of the crankshaft hole processing engine performance Will have a great impact , so the engine crankshaft hole is generally more stringent process requirements , including diameter , Set , roundness , the center of the file crankshaft hole straightness and surface roughness . Honing help reduce the residual stress in the surface of the crankshaft hole improve the surface quality . Honing is used mostly by cutting fluid filtered kerosene or kerosene plus spindle oil , may also have extreme pressure emulsion. Easy to cut erosion Crumbs, to avoid clogging honing , while reducing the temperature of the cutting area and the surface roughness . ( 3 ) connecting rod bore ( large and small end ) honing Pistons and crankshaft connecting rod is in the middle part , the main role is to shift the piston reciprocating motion A rotary motion of the crankshaft . Rod machining accuracy will directly influence on the engine performance , Which rod head size hole machining important process of connecting rod machining , precision machining on its link quality has a greater impact . After honing makes connecting rod hole tolerance level reaches IT6, surface roughness Ra to be less than 0.4μm; small head hole tolerance grade IT8, surface roughness Ra should be less than 3.2μm. To meet the needs of the machining accuracy . ( 4 ) in the injector nozzle and piston honing the processing of a number of tiny holes , hole honing surface roughness can increase the difference between the nozzle flow coefficient of 0.8 or more; can eliminate the pressure chamber and the discharge hole glitches , expanding its line of intersection of the fillet , reducing high pressure oil pressure loss ; reducing orifice surface roughness , increasing the speed of the oil , get a good atomization ; nozzle flow coefficient can be increased , so that dynamic spray angle and flow tends to a to , Reduces fuel consumption and emissions targets.