Determine the test facilities of new-style hydraulic pressure of the coefficient of friction below tall contact pressure

The summary introduced a kind to determine new-styly the hydraulic pressure test facilities of the coefficient of friction that all sorts of metal stuff issue in tall contact pressure. Test and verify of experiment of this device classics, can be used accurately at the coefficient of friction that falls in all sorts of operating mode between stuff of the metal below tall contact pressure determine. System of hydraulic pressure of keyword coefficient of friction determines 1 foreword is in device in craft of metallic plasticity figuration and gearing of heavy equipment machinery, quite high contact pressure often exists between metallic stuff. In tall contact pressure condition falls, the attrition state of affairs between metallic surface is quite intricate, be in dry attrition and compound of photograph of attrib border attrition to do attrition state partly commonly. The actual contact area that right now pressure of low contact of actual contact area ratio leaves is gotten greatly much, the law between attrition force and attrition face concerns to load disproportionate, coefficient of friction is constant no longer, accord with classical Amengdu no longer namely one coulomb attrition is mensurable [1] : 　 of 　 of 　 of μ ＝ T/N (in 1) type: μ -- coefficient of friction; T -- attrition force; N -- pressure. In tall contact pressure condition falls, attrition force T and of pressure N nonlinear relation, bring about cannot refinance is aided at constant T of force of attrition of computation of μ of coefficient of friction. Accordingly, the μ of coefficient of friction that determines accurately to fall in all sorts of high pressure condition, the attrition force T that builds all sorts of pressure condition to fall and the conversion of pressure N concerns, to the craft of metallic plasticity figuration actor of computation of analysis, deformation force, equipment is chosen, the stiffness of the metallic component in mechanical drive and intensity analysis, wear away to be calculated with exhaustion, and of lubricant choose etc, have important sense [1, 2] . Current, determine to fall to there basically are two kinds in the method of the coefficient of friction when plasticity figuration especially in condition of tall contact pressure, it is pincers, rolling law, it is cirque Dui rough method [1] . Former requirement has rolling mill facility, latter requirement has compressor, and it is the operating mode that produces size distortion in the light of metallic stuff, reason uses these two kinds of methods to determine coefficient of friction is quite disadvantageous, and repeatability is poor, contingency element is much. The test facilities that develops in the article uses coulomb law concept, use hydraulic pressure coefficient to determine piece corresponding the attrition force T below pressure N, calculate those who give all sorts of metal stuff below condition of different high pressure to fall in different operating mode to move thereby, static friction coefficient. The principle of the hydraulic pressure test facilities of the coefficient of friction that principle of test facilities of 2 hydraulic pressure determines to fall in condition of tall contact pressure is shown like plan institute. The working process of system of this hydraulic pressure is: The working principle of hydraulic pressure test facilities 1.

Gasoline tank 2, 7.

A powerful person of magnetism of 3 4 electrify 3.

Electric machinery 4.

Shaft coupling 5.

Gear pump 6.

Overflow a powerful person 8.

Fluid charges one-way a powerful person 9, 13.

Hydraulic pressure crock 10, 11.

Pressure is expressed 12.

Throttle 　 (1) according to detect requirement, will secure what go up in test facilities to go up pressure head, fixed the material that in hydraulic pressure crock next pressure head of the piston lever head of 9 change the requirement that it is place, will wait for at the same time those who measure metallic stuff is double-faced the lubricant that asks on Tu Fu, place go up in next pressure head. (2) is in when electro-magnet 1DT, 2DT, 3DT, 4DT cut off the power when condition, the electric machinery that start 3, hydraulic pressure oil passes gear pump 5, a powerful person of magnetism of 3 4 electrify 7, 2 oil sump tank 1. (Electrify of 3) electro-magnet 1DT, a powerful person of magnetism of 3 4 electrify of 7 left a job, hydraulic pressure crock the piston lever of 9 rises, will wait for measure metallic stuff impaction going up, between next pressure head, its pressure is expressed by pressure 10 show. (4) cuts off the power when electro-magnet 1DT when, a powerful person of magnetism of 3 4 electrify 7 regain the position intermediate, gear pump 5 discharge carry on his shoulder or back, hydraulic pressure crock 9 one-way a powerful person charges in fluid protect below the action of 8 pressure. (Electrify of 5) electro-magnet 3DT, a powerful person of magnetism of 3 4 electrify of 2 left a job, the piston lever of 13 retreats hydraulic pressure crock right inside cylinder body, its pulling force is expressed by pressure 11 show, hydraulic pressure crock the drawing speed of 13 by throttle 12 control. Crock of record hydraulic pressure 13 begin to slide and the pressure when sliding smoothly expresses the reading of 11. (After 6) drawing ends, electro-magnet 3DT cuts off the power, a powerful person of magnetism of 3 4 electrify 2 regain the position intermediate, gear pump 5 discharge carry on his shoulder or back. (Electrify of 7) electro-magnet 2DT, a powerful person of magnetism of 3 4 electrify of 7 right a job, the piston lever of 9 retreats hydraulic pressure crock downward inside cylinder body. (8) electro-magnet 2DT cuts off the power, a powerful person of magnetism of 3 4 electrify 7 regain the position intermediate. (Electrify of 9) electro-magnet 4DT, a powerful person of magnetism of 3 4 electrify of 2 right a job, the piston lever towards the left of 13 extends hydraulic pressure crock. (10) electro-magnet 4DT cuts off the power, a powerful person of magnetism of 3 4 electrify 2 regain the position intermediate. Visible, this test facilities is main by hydraulic pressure crock stuff of 9 pairs of metals brings to bear on pressure N, by hydraulic pressure crock stuff of 13 pairs of metals brings to bear on tensile force F, adopt a change speed of stuff of pressure, lubricant, metal, opposite motion, can measure what operating mode falls differently pressure N and tensile force F, use undermentioned formula next: 　 of 　 of 　 of μ ＝ F/2N (2) plan cipher out is moved accordingly, static friction coefficient. 3 coefficient of friction determine example applies this device to determine 1Cr18Ni9Ti armor plate and Cr12 mould steel are in temporary lodging during a trip of state of tall contact pressure lubricates at castor oil the room temperature coefficient of friction when the condition. Express by pressure 10 read take hydraulic pressure crock the hydraulic pressure force of 9 is 0.

64MPa, express by pressure 11 read take hydraulic pressure crock the 13 hydraulic pressure force when beginning to slide and slide smoothly are 0.

25MPa and 0.

17MPa. The pressurization area according to antrum of piston of hydraulic pressure crock and piston lever antrum is 1256mm2, 876mm2 respectively, calculable give this stainless steel board the static friction coefficient below lubricant condition is 0.

137, kinetic friction coefficient is 0.

093. The hydraulic pressure test facilities that 4 conclusion use the article to develop determines accurately the coefficient of friction that falls in different operating mode between stuff of the metal below condition of tall contact pressure, the actor of the mechanical analysis of component of the metal in be analysis of craft of metallic plasticity figuration, mechanical drive thereby or lubricant is chosen provide strong basis. CNC Milling