The efficient treatment experience of big, heavy work

Efficient treatment (HPC) it is to show what be measured through raising the excision of stuff of the metal inside unit time and machine a process is comprehensive optimize, reduce cutting further basic time and auxiliary time, improve treatment efficiency, drop the project of a system that processes charge. Its core is to raise material excision rate, compare in the rough machining working procedure of large, heavy work especially practical, can show reduce basic cutting time. Concept of a kind of when the promotion that putting forward is the development that accompanying technology of contemporary cutting tool and technology of machine tool numerical control applies and arise of this one concept comprehensive treatment. Its masterstroke is to reduce manufacturing cost, raise economic benefits. 1.

Use contemporary cutting tool " labour desire be apt to its thing, surely first benefit its implement " , the development of cutting tool material and coating technology provided safeguard for efficient treatment. Contemporary cutting tool uses a variety of coating technologies (CVD, PVD, WC) the hot rigid in improving process of cutting tool cutting, base material makings used the knife to exceed fine pulverous metallurgy, raise the wearability of cutting tool. International of special grade of if hill is special Weikekeleman, made of baked clay Er is worn the CVD coating technology that renown tool production manufacturer uses, among them the Al2O3 structure of α photograph is stable, performance is superior, the TiCN that lukewarm CVD forms in eliminated flimsy between hard alloy matrix and alumina film layer η phase greatly and the binding energy power that enhanced velar layer, can raise cutting rate substantially thereby; The hard alloy base material that cobalt strengthens undertook buildup to the point tenacity of cutting tool again, raised feed rate thereby; Its point still undertook polishing after coating, reduced thereby cut the attrition between bits and razor blade, reduced felt tatty to happen, improved cutting tool life; Cutting blade length is increased ceaselessly, rolled out 15mm, 19mm, 25mm to wait to cut the rough machining razor blade of deep, heavy load greatly. Can say, the development of cutting tool technology satisfied the requirement that efficient cutting processes heavy-duty, large work completely, use actually wider and wider also, if age closely milling cutter, long knife milling cutter (common calls corn milling cutter) it is heavy work the commonly used cutting tool of efficient treatment. Cutting tool of pottery and porcelain, cubic nitrogen turns the research of boracic cutting tool and promotion, offerred effective program to solve the treatment of material of high temperature, tall hardness, reduced workpiece effectively to take up the time of the machine tool. Knife handle, turn of the join means such as tower, clamp modular design, from radial, axial comprehensive high accuracy locates, assure to install the size consistency of clip every time, showing reduce the time that change a knife, reduced the auxiliary time that workpiece machines. Modern cutting tool classification is fine, specific aim is stronger, the material that the basis wants to differ when specific applying, different treatment kind, different craft characteristic has logical choice, develop the optimal efficiency of cutting tool. Although the price of these modern cutting tool compares 1~2 of tower above of common cutting tool times, but workpiece whole finished cost can reduce 15%~20% however, economic benefits clearly. Because serve as the cutting tool expenditure that easy bad news tastes to be made in the product,3%~4% is occupied only in totle drilling cost, and main charge is expended in machine tool holding time and artificial cost (occupy 20%~25% ) on. 2.

Choosing greater machine tool power to lay in the 2nd respect that realizes efficient treatment is the machine tool should have greater cutting power and the power reserve with have certain, namely heavy-duty machine tool. The cutting power here points to dynamical system not simply, point to whole cutting system however, include machine tool structure, machine tool to bearing, system of positive drive, clamp, cutting tool system. Machine tool configuration uses the structure with inferior centre of gravity more, centre of gravity jumps over tall tigidity to jump over difference, the not stable element in cutting process is about to increase, wait for phenomenal happening like vibratile, resonance, this pair of big cutting deepness or feed speed is very adverse. Sliding slideway chooses slideway of unifinication of planar H form as far as possible, those who assure cutting process is smooth slip. The machine tool is the biggest bearing 1 what load should be more than weight of work semifinished product.

5~2 times, make the equipment of hard usage OK thereby in most get be usinged adequately inside high-power limits. Heavy-duty machine tool is large, the foundation that heavy work realizes efficient treatment, its firm oneself weight (general > 30t) treatment offerred the efficient cutting that is large work to assure, rigid cutting tool system is sufficient the big torsion demand of OK and contented efficient cutting. 3.

Material excision measures material to excise the computation that measures Q. The material of unit time excises a quantity to be able to use next type to express: Can see increase cut deep Ae to perhaps cut bits ply Ap to be able to raise material to excise a quantity, and increase Ap of the ply that cut bits to raise feed rate namely, in model of workpiece material, cutting tool and machine tool particular case falls, of feed speed rise to often bring main shaft rotate speed rise, this meets those who accelerate cutting tool wear away, lower the service life of cutting tool. But increase the service life that cuts deep Ae not to affect cutting tool, accordingly, often use in rough machining process increase the material that cuts deep Ae to increase unit time to excise a quantity, reduce knife number, realize efficient treatment, grow way especially (long wide) the work with larger proportion, reduce economic machine tool holding time is clearly to take knife place. 4.

Applied example graph shows work of long canister body 1 times, supplied materials condition moves simple semifinished product for forging rough machining, weight 34t, surplus is larger, be in commonly 12~14mm, and form of tone qualitative change makes local treatment capacity can amount to 15~17mm, workpiece length is in 8 000mm, the handling time of each knife is 14~16h, choose Germany to produce heavy-duty 3m center lathe, the machine tool is the biggest carring capacity 50t, 90kW of power of main shaft electromotor, equipment power is laid in relatively have more than needed, the cost when equipment aircraft is higher also, graph 2 pursue for objective. Nextpage 　 razor blade chooses hill spy dimension to overcome bit of coating of coke full SNMG150612 (graph 3, brand GC4225) , its applied two TiCN coat adscititious Al2O3, suit the rough machining of interrupted cutting more. Cutting process enclothes refrigeration completely, prolong bit service life. The two influences condition that measures Q from material excision cuts deep A E and A P of the ply that cut bits to look, a P cannot pass big, f of rough machining feed is the 1/2 of arc of R of point of a knife commonly, namely every time walks along knife time to have too big adjustment impossibly limits. So, increase cut deep A E, reduce knife number as far as possible, can reduce machine tool holding time, reduce treatment cost, raise economic benefits. 15mm of length of blade of cutting of SNMG150612 razor blade, according to effective cutting deepness the principle that is 1/2 of cutting blade length, can achieve greatly most 7.

5mm, the mental allowance of 17mm, rough machining needs 2 knives. Consideration equipment power is richer, designed combination boring head, if the graph is shown 4 times, two razor blade one before one hind attend cutting at the same time, cut deep A E the biggest amount to 10~13mm, 1 knife can finish rough machining, in feed F N changeless circumstance falls, reduce machine tool holding time to reduce 14~16h, reduce workpiece finished cost apparently. Efficient treatment is OK still from raise cutting rate, reduce workpiece to hold clip time, use compound cutting tool, reduce the number that change a knife, reduce the respect such as treatment working procedure to consider integratedly, wait for flow of equipment, workpiece, tool, cutting tool, treatment regard a job as whole, adopt the treatment technology of optimization according to the actual condition of workpiece, reduce workpiece to take up the time of the machine tool, raise economic benefits. In the meantime, can shorten production cycle, come true to be made quickly thereby, the client that is oneself creates value, enhance the market competition ability of the enterprise. CNC Milling