Boring lever vibrating absorber

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The cantilever of cutting tool is longer, cutting tool suffers self-excitation or outside stimulate vibration to feel with respect to Yue Min. The test that lever of qualitative to steel boring has makes clear, use compound concrete to regard cutting tool kernel as this one technology have wide applied perspective. Action is mixed in the self-excitation on the machine tool outside stimulate vibration to be able to reduce cutting efficiency, reduce what the exterior quality of workpiece quickens cutting tool to wear away. Accordingly, the dynamic tigidity that improves machine tool, cutting tool, clamping apparatus and work appears very necessary. Besides static stiffness, of the system decrease brace up character also is a crucial parameter. Through using the steel simple case with static higher stiffness, interior collects appliance to be decreased higher fully brace up the trends that characteristic compound concrete kernel can increase boring staff is characteristic. So far the experiment is trying to keep boring lever kernel existence oil or among balata complex. The boring lever crust of article introduction is the boring staff that heads compound concrete kernel steel simple stuff, the kernel is compound concrete. The steel of periphery pledges crust can raise the static stiffness of boring lever, and the dynamic stiffness that the kernel can increase boring staff, rise to decrease display vigour to use accordingly thereby. When dimension of affirmatory kernel part, the tension that needs to consider steel simple case / compressive strength, bending strength and stretch deformation coefficient. To avoid to reduce the static stiffness of boring lever and its intensity substantially, the diameter of compound concrete kernel should not exceed diameter of steel simple case 50% to 60% . The length of compound concrete kernel also must restrict the 85% less than that spend in boring lever overall length, will reduce the hardness of boring lever head otherwise. Divide this beyond, when designing structure of compound concrete kernel, still need to consider its fragility and collapse blade sex. Graph 1: ?  lax spring Liao Zheng of small box wicking  says lever of Mo DI40 boring is archetypal, zun Qi of boring lever weight is: 2.

53 kilograms, 2.

11 kilograms with 1.

89 kilograms. The working radius =5xD that passes optimized boring lever (D= boring shank diameter) . When the working radius when boring lever does not exceed 4xD, can use steel qualitative data entirely, in order to acquire more satisfactory job character. From the point of the craft that make and mechanical parameter angle, mix by epoxy resin quartz is arenaceous the stuff stuff that the compound concrete that make fits to regard boring lever as the kernel quite. These two kinds of material mix each other can ensure between lesser material contractility and as simple as steel case better caking property. The grain diameter of stuff stuff is the biggest must demarcate is in 3.

6 millimeter less than, in order to obtain stream become characteristic to be worth. The weight in compound concrete compares 12% for epoxy resin, 88% for quartz arenaceous. Production boring lever is archetypal, the first pace needs to be on lever of existing boring of complete metal structure bore, fill compound concrete next and undertake compression. The wear out condition of the exterior quality to workpiece and cutting tool is having performance of condition of movement of movement condition performance to be affected tremendously. At present method of popular experimental sex examination is mode analysis. The dynamic function after improving can improve the grade of exterior surface roughness of target dimension. To achieve this goal, need is undertaking fore-and-aft try exterior surface roughness and cutting tool life are measured when cutting. What the mode analysis of experimental sex points to is have the aid of at so called free frequency, attenuation and stiffness (perhaps use freedom is spent and acceleration) mode parameter will describe oscillatory system. The execution that the mode analysis that LMS company offers measures a system to will be in charge of whole analysis process and evaluate. Test head is in free condition, need to remove that is to say laden, use pulse hammer to have drive. The response of whole system signal is gotten by the quartz that suppress report. Graph 2 those who show is the relation between the flexibility that measures and frequency. In 2.

2KHz and 2.

Between 4KHz 1 rank freedom curves frequency and freedom to curve oscillatory form to having conclusive sense to cutting process. 2 rank and 3 rank the flexibility that resonance position is in is extremely low, negligible its are right the further effect of cutting process. Graph the 3 resonance flexibility that those who show is lever of complete steel qualitative boring and lever of two kinds of archetypal boring. Archetypal boring lever has lesser weight, make its 1 rank free frequency gets rising. The kernel diameter of 25 millimeter can avoid to produce planar moment of inertia conversely, and planar moment of inertia will reduce static stiffness. This meeting makes when 25 millimeter 1 rank the numerical value when free frequency is less than 20 millimeter. Also can discover this kind of effect in process of attenuation of thunder family name. Try cut and static function is on lathe of numerical control of a Gildemeister undertake trying cutting. The VDI cutting tool that direct outfit places boring lever in the standard turns on the tower (graph 5) . When the length that hold clip is 100 millimeter, working radius is equal to 200 millimeter (5xD) . Undertake interior to 42CrMo4 material fore-and-aft try cut, the cutting that differs in two kinds has trial run below the condition of speed and feed. Every kinds of circumstance falls to all will be worth Ra to undertake metrical to surface roughness. Watch 2 in those who show is cutting measure and adjust an amount (experimental parameter) , cutting deepness will maintain 0.

5 millimeter are changeless. The first group of parameter showed the maximum that appears possibly, will inevitable ground produces creeping phenomenon when numerical value is too great. Graph 6 showed try the Ra of surface roughness result that appears on dimension of the target when cutting. In the watch 2 in the adjustment that give out below parameter circumstance, surface roughness all was worth Ra to maintain inferior level. The 1st group of data can reduce surface roughness 34% , the 2nd group can be reduced 31% , the 3rd group can be reduced 49% , the 4th group can be reduced 33% . Next will according to finite yuan the method undertakes an analysis to static function. The force of the generation in cutting process the basis subordinate list [the Kienzle form of 3] and watch 2 medium parameter have consideration. Accordingly, the cutting force that the cutting parameter of the generation below the 1st group of data is 320 Newton, feed force of 128 Newton and the passive force of 128 Newton. Graph 7 those who show is the boring lever below the force of mark and attrib border condition finite yuan of model, reach what its bring about to be out of shape. Increase when compound concrete diameter, the static stiffness of boring lever will be reduced subsequently. When kernel diameter is 25 millimeter, of boring lever be out of shape the inside limits of actual license public errand maximum when will achieving cutting to machine [4] . According to the watch the 1st group of 2 medium data, brand-new the boring lever of development will produce different exterior wear out condition. Can reach the largest cutting amount from this. Graph the 8 plane that showed lever of 3 kinds of boring follows cutting time to arise wear away situation. In 0 the most adjacent and actual.

Below wear out condition of 4 millimeter surface, will reach after 30 minutes its service life. With steel qualitative boring lever serves as but photograph of base of dislocation razor blade is compared, on lever of boring of compound concrete form but the service life of dislocation razor blade can rise 24% . Epilogue is in longer lever of qualitative boring of the steel below the circumstance of cantilever will be reduced as a result of dynamic stiffness and appear bend be out of shape. Will bring about cutting tool to wear away next, workpiece surface quality also is reduced subsequently. The boring lever that contains compound concrete kernel can offer its trends height significantly, improve the service life of cutting tool thereby 24% , improve the exterior quality of workpiece 49% . These data prove, compound concrete structure can avoid static metabolic to appear. CNC Milling