6 nitrogen change coating boron eletroplates CBN wheelhead grinds experiment of the alloy that cast titanium

Foreword wheelhead is commonly used the burnish treatment that waits at pouring horn, milling to receive knife mark, when using, install normally in portable high speed is made rotate on the tool, do not use cooling fluid commonly. Means of treatment of this kinds of burnish is in those who remove the structural member of large titanium alloy that becomes by milling on the plane to receive knife mark and the circular arc that make sure spare parts corner is in to transfer naturally waited for a circumstance to receive wide application. It is at present in the burnish treatment of titanium alloy, often use monolayer to eletroplate CBN wheelhead, this kinds exceed hard abrasive wheelhead to have than the grinding function of common abrasive wheelhead rise apparently. In be being machined as a result of the material character of titanium alloy and burnish need not cooling fluid, after grinding still exists for some time in burnish treatment, monolayer eletroplates CBN wheelhead surface has apparent titanium bits adhere, cause those who grind space of bits of the look between bead to jam, the problem that the material purify ability of wheelhead drops. The article chooses 6 nitrogen to change boron (local name white black lead) as solid lubricant, use proper technology, its Tu Fu at eletroplating CBN wheelhead surface, the grinding experiment of workpiece of alloy of the titanium after undertaking milling studies, to score analyse coating 6 nitrogen change boron lubricant and those who do not have lubricant eletroplate CBN wheelhead, the exterior surface roughness of alloy of burnish treatment titanium is worth and the accumulative total purify of workpiece material is measured, raise monolayer to eletroplate with hunting the effective method that purify of material of alloy of titanium of treatment of CBN wheelhead burnish leads. 1 experiment method pursues 1 pursue for test facilities. Among them, eletroplate CBN wheelhead rotates with the linear velocity of Vs=10m/s, workpiece the speed with Vw=4m/min is fore-and-aft reciprocate, realize wheelhead to be machined to the grinding of workpiece thereby. The workpiece that article grinding experiments is the TC4 titanium alloy of milling savagery, use what granuality is 80/100 to eletroplate CBN wheelhead, f of force of constant voltage of ordinal change to load is 1.

99N, 2.

82N and 3.

65N, the fore-and-aft feed of grinder of have the aid of moves, burnish undertakes to workpiece on test facilities, part after burnish 2min, 5min, 8min, 12min, with MarSurfPs1 surface surface roughness appearance measures workpiece surface surface roughness to be worth, measure material purify rate. Lubricant is changed for 6 nitrogen boron and shrink the even solid lubricant that fourth aldehyde passes supersonic oscillation preparation, its via proper technology even Tu Fu is in eletroplate on CBN wheelhead (if pursue,2 show) . 2 tests result and discuss 2.

Result of test of 1 surface surface roughness is shown 3 times like the graph. By the graph 3a can be seen, without lubricant wheelhead burnish surface roughness of surface of treatment titanium alloy is worth, reduce quickly inside 0 ～ 5min as the addition of grinding time, inside 5 ～ 12min elevatory as the addition of grinding time. Machine exterior surface roughness to the value follows constant voltage value to increase and increase. After classics 12min burnish is machined, workpiece surface surface roughness is worth span to be Ra1.

56 ～ 1.

72 μ M. By the graph 3b can be seen, 6 wheelhead burnish that nitrogen changes boracic lubricant machine coating surface roughness of titanium alloy surface is worth, after the addition that lets grinding time lifts first, reduce, the metabolic rule that surface roughness is worth treatment surface to be changed along with constant voltage is not clear. After classics 12min burnish is machined, workpiece surface surface roughness is worth span to be Ra1.

42 ～ 1.

50 μ M, agree basically with surface roughness of surface of the workpiece after the wheelhead 12min burnish that does not have lubricant. Nextpage is shown 4 times like the graph, for constant voltage F=1.

When 99N, without lubricant and Tu Fu 6 nitrogen change boracic lubricant two kinds differ eletroplate CBN wheelhead, the workpiece surface surface roughness that burnish machines is worth the relation with time. When constant voltage F=1.

When 99N, the workpiece surface surface roughness of 6 wheelhead burnish that nitrogen changes boracic lubricant is worth coating, show the trend that after increasing first, reduces, with when having lubricant contrary. Surface roughness of surface of the workpiece after classics 12min burnish is worth roughly equal, for Ra1.

55 μ M. If the graph is shown 5 times, for constant voltage F=2.

Lubricant and Tu Fu are not had when 82N 6 nitrogen change boracic lubricant two kinds differ eletroplate CBN wheelhead, the workpiece surface surface roughness that burnish gets is worth the relation with time. When constant voltage F=2.

When 82N, 6 nitrogen change coating the workpiece surface surface roughness that burnish of boracic lubricant wheelhead gets is worth, the current that after still appearing to increase first, reduces, with when having lubricant contrary. Right now, 6 nitrogen change coating boracic lubricant can get slightly low exterior surface roughness is worth, its limits is Ra1.

30 ～ 1.

55 μ M. If the graph is shown 6 times, for constant voltage F=3.

Lubricant and Tu Fu are not had when 65N 6 nitrogen change boracic lubricant two kinds differ eletroplate CBN wheelhead, the workpiece surface surface roughness that burnish gets is worth the relation with time. When constant voltage F=3.

When 65N, in grinding initial stage, 6 nitrogen change coating the workpiece surface surface roughness that burnish of boracic lubricant wheelhead machines is worth, the workpiece surface surface roughness that summary prep above machines without lubricant wheelhead burnish is worth, and in grinding later period, fall without lubricant condition, the tendency that the value has the workpiece surface surface roughness that burnish gets to increase ceaselessly, surface roughness of surface of 6 workpiece after nitrogen changes boracic lubricant burnish is worth coating keep basic and changeless, its value is Ra1.

42 μ M. 2.

If the graph is shown 7 times,2 material purify leads test result, the abscissa is time T(min) , ordinate Qw(mm3/mm) is the quantity of purify of material accumulative total of wheelhead unit width. Test result makes clear, below value of 3 kinds of different constant voltage, without lubricant and Tu Fu 6 nitrogen change boracic lubricant wheelhead, hit the material purify quantity that grinds workpiece to lengthen and increase as handling time, the initial stage that machines in burnish (0 ～ 5min) , without lubricant and Tu Fu 6 nitrogen change boracic lubricant eletroplate CBN wheelhead, the purify amount of alloy of burnish treatment titanium is basic and equal, the extension as burnish handling time (5 ～ 12min) , 6 nitrogen change coating the material purify quantity of alloy of titanium of burnish of boracic lubricant wheelhead, want prep above to process purify volume without the burnish of lubricant wheelhead, because not have,this is of lubricant eletroplate CBN wheelhead, as the extension of grinding time, the surface appears the adhere that apparent titanium alloy worries bit, namely the space holding bit of wheelhead is blocked up, its grinding processability can be abate, and 6 nitrogen change Tu Fu the wheelhead surface of boracic lubricant does not have apparent titanium bits adhere, make burnish certain after time, grind bead to still protect the grinding with better hold to machine function. 3 conclusion pass what to having lubricant and Tu Fu 6 nitrogen change boracic lubricant to eletroplate the experiment research of alloy of titanium of treatment of CBN wheelhead burnish, get the following and main verdict: (When 1) does not have lubricant, surface roughness is worth the treatment surface of workpiece to machine initial stage in burnish, reduce quickly as the addition of grinding time. In grinding later period, elevatory as the addition of grinding time. The span that is worth via exterior surface roughness is being machined after 12min burnish is Ra1.

56 ～ 1.

72 μ M. 6 nitrogen change coating when the wheelhead burnish workpiece of boracic lubricant, treatment surface surface roughness is worth, present the variation that after the addition as grinding time lifts first, reduces. The span that is worth via exterior surface roughness is being machined after 12min burnish is Ra1.

42 ～ 1.

50 μ M. (2) is inside the burnish time of 12min, 6 nitrogen change coating of boracic lubricant eletroplate CBN wheelhead, value and the workpiece surface surface roughness when having lubricant are worth surface roughness of surface of the workpiece after burnish to agree basically. (6 nitrogen change 3) Tu Fu of boracic lubricant eletroplate CBN wheelhead, burnish processes the volume of purify of accumulative total material of titanium alloy, want what prep above does not have lubricant to eletroplate CBN wheelhead, the material purify that burnish machines is measured, namely monolayer eletroplates 6 nitrogen change coating of CBN wheelhead classics after boracic lubricant, its ground the grinding processability of bead to be able to get ameliorative. CNC Milling