Machine the be sure to that adds a person to must be collected cuts dosage to choose detailed method and strategy

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Cutting quantity is the important parameter that before adjusting a machine tool, must decide not only, and parameter setting is reasonable to machining quality, treatment efficiency and manufacturing cost have very main effect. So what is reasonable cutting dosage? Fu Lan ground thinks “ is reasonable the cutting dosage of ” , point to namely in ensure the premise of quality falls, make full use of the cutting dosage that the dynamical performance of the cutting function of cutting tool and machine tool will come to obtain low finished cost and tall productivity. The element that the consideration needs when formulate cutting dosage 1. Cutting machines productivity to be in cutting process, 3 element Ap, F, V all maintains metallic excision rate and cutting dosage linear relation, that is to say among them any parameter increases, can make productivity rises. But the impact that considers cutting tool life, when among them when a parameter increases, two parameter must reduce other accordingly. So, when we make cutting dosage, the optimal combination of 3 element obtains tall productivity just is reasonable cutting dosage. Below circumstance of general rough machining, meeting as far as possible preferential increase amount of back penetration of a cutting tool, in order to achieve the surplus that feed excises treatment entirely. 2. When machine tool power should carry quantity of penetration of a cutting tool and cutting speed on the back to increase, can make cutting power increases. And feed is compared to cutting power influence small. So, when rough machining, ought to increase feed as far as possible. 3. Of the durability cutting dosage of cutting tool reasonable the durability that can affect cutting tool directly, namely the cutting tool life that we say, it is quantity of penetration of a cutting tool of cutting speed, feed, back by order. According to this order, we can reach a conclusion, to assure the life of cutting tool, we should bear amount of penetration of a cutting tool greatly as far as possible; Choose big feed again next; Seek a cutting rate finally, if you are local tyrant, take no account of cutting tool life to should be not talked additionally then. 4. When treatment surface surface roughness is doing precision work, the feed that increases us also can increase the surface roughness that machines the surface to be worth at the same time. This is the main factor that affects precision work. Below idealer operating mode, raise cutting speed to be able to reduce exterior surface roughness; And the impact that carries penetration of a cutting tool on the back to measure pair of surface surface roughness is less. Fu Lan ground thinks dosage of logical choice cutting, should choose to use up generous to carry penetration of a cutting tool on the back to measure above all, choose a big feed again. The option below the condition allows in cutting tool durability and machine tool power finally a reasonable cutting rate. The element that chooses the way of cutting dosage to be able to affect cutting dosage is very much, for example working procedure of category of material of cutting tool material, parameter of cutting tool geometry, workpiece, craft, treatment and specific use condition, for instance cutting fluid, machine tool, outfit places the element that waits for many sided, when encountering a lot of vermicelli made from bean starch to ask cutting dosage parameter so, do not have accurate result actually, great majority or by experience, the uncertainty of all sorts of elements, quantify hard, come without the method at present dosage of accurately cipher out cutting. So the way that we make cutting dosage has commonly the following 3: It is to check manual, can examine speed of feed, cutting and cutting tool life commonly. The data on manual also can serve as reference only, because the data of manual is to pass specific requirement to fall, make the mathematical model that cutting experiment will come to build, use a case actually specific use condition and experiment condition and our and different, must make certain correction according to machining a circumstance actually, reuse process is medium at the same time, make again according to machining a circumstance to machine the effect adjust appropriately, will get optimal cutting dosage. 2 it is the product an album of paintings that checks tool manufacturer, the cutting speed that answers relatively and feed also can be recommended commonly while product an album of paintings is introducing a product, when be being used of course, also should do according to actual condition adjust. 3 it is to do cutting test, this kind of means can get the most reasonable cutting dosage, also be a kind of means with highest cost at the same time, if machine thin volume not to suggest to try more, we can follow the condition of the experiment as far as possible actual operating mode all the time, obtains cutting dosage is the most accurate. The selection method of reasonable cutting dosage 1.

The selection method that bears amount of penetration of a cutting tool we normally first make choice of bears amount of penetration of a cutting tool, carrying penetration of a cutting tool on the back to measure still have mental allowance to decide according to machining property commonly. So we consider the factor such as cutting tool material, workpiece material, machine tool and treatment working procedure even, make the most reasonable allocation to mental allowance. According to the productivity of turning computational formula can get, manufacturing P=A0vcfap(among them A0 is invariable) , we increase amount of back penetration of a cutting tool, productivity can rise into direct ratio, the influence that carries penetration of a cutting tool on the back to measure pair of cutting tool life moreover is the smallest, when cutting tool life is certain, increase back penetration of a cutting tool to measure more advantageous to improving productivity than increasing feed. So, when rough machining, we take amount of large back penetration of a cutting tool as far as possible, will reduce the number of feed, improve manufacturing efficiency. But increase quantity of back penetration of a cutting tool to be able to make cutting force adds again, meet in the cutting force when cutting surplus is large especially very big, carry what penetration of a cutting tool measures on the back to add gist to be below machine tool power and the condition that rigid condition allows the system. When doing finish machining or semifinishing machining, mental allowance should take lesser cost, will reduce cutting force and be out of shape, ability ensures the life of cutting tool, will assure to machine quality, but when more serious to machining sclerosis stuff, the smallest back penetration of a cutting tool measures Ying Chao to go up too the deepness of the sclerotic layer that working procedure produces. Back penetration of a cutting tool measures common ground to machine property to decide with mental allowance. Cutting machines general component to be rough machining (exterior surface roughness is worth Ra=50 ～ 12.

5μm) , semifinishing machining (Ra=6.

3 ～ 3.

2μm) with finish machining (Ra=1.

6 ～ 0.

8μm) . In the following circumstance, second feed should divide when rough machining: 1) .

When mental allowance is too big, the cutting power that can bring about primary feed is too great, machine tool power may is not worth or the intensity of cutting tool is insufficient, make cutting tool attaint breaks a knife even easily. 2) .

Craft stiffness compares the situation with inferior or extremely inhomogenous mental allowance, when can causing bigger vibration, 3) .

Below interrupted cutting circumstance, cutting tool can get very big when pound and causing dozen of knife. Even if fall in afore-mentioned circumstances, also answer a first time feed or quantities of before a few back penetration of a cutting tool of feed are obtained as far as possible somes big, if be feed twice, criterion the 2/3~3/4 that the quantity of penetration of a cutting tool of first time takes mental allowance commonly. Want to make carry penetration of a cutting tool on the back to measure the thickness that exceeds crustaceous or cold hard layer as far as possible, will prevent cutting tool to wear away prematurely. 2.

The choice feed of feed F can compare a back to the influence of cutting tool life amount of penetration of a cutting tool is a lot of larger, but smaller than cutting speed. Feed we are OK the actual condition such as working procedure of the material category of the hardness according to workpiece material, intensity, cutting tool, treatment presses experience or consult manual, the data such as product an album of paintings is chosen. 1) .

When doing rough machining, ask to already machining exterior quality not high case falls, at this moment cutting power is greater, the choice of feed basically is the limitation that gets cutting power. We can be below the condition that stiffness of arbor, razor blade, workpiece and intensity of structure of machine tool feed allow, choose bigger feed. 2) .

When finish machining and semifinishing machining, because carry penetration of a cutting tool on the back the amount is smaller, the cutting power that produces is not great, at this moment the choice of feed basically is the limitation that is machined exterior quality. Have when the knife transfer reasonably blade, Xiu Guangren, and when using higher cutting rate, feed F can be chosen appropriately a few bigger, so that improve manufacturing efficiency. 3.

The general principle of the speed of cutting of the choice in choosing to machining a process of cutting speed is: 1) .

When half essence mill, feed two with the back penetration of a cutting tool is measured bigger, choose inferior cutting career so; Contrary essence mill chooses higher cutting rate. 2) .

When workpiece material hardness, intensity is high, should pick inferior cutting speed. 3) .

The steel that cutting moves qualitative condition compares steel of state of cutting normalizing, anneal to want to lower cutting rate 20% ～ 30% ; Cutting alloy steel reduces 20% ～ than speed of cutting of cutting medium carbon steel 30% ; Cutting nonferrous metal can raise 100% ～ than the cutting speed of cutting medium carbon steel 300% , 4) .

The cutting performance of cutting tool material is better, cutting rate is higher also, the cutting speed of the hard alloy cutting tool of Fu Lan ground is for instance OKer than high-speed steel cutting tool tower above is severalfold, the cutting speed of the cutting tool after coating center coating compares rich Landepuladi not coating cutting tool wants tall. When making cutting career, consider the following aspects even: 1) .

Should answer to escape scale is pricked and accumulate the place that bits tumour produces as far as possible when finish machining. 2) .

When interrupted cutting, want to reduce concussion and thermal stress, should lower cutting rate appropriately. 3) .

Below incidental oscillatory circumstance, cutting speed wants the critical rate of escape self excited vibration. 4) .

Machine large work, thin wall workpiece and slightness or when taking cortical work, ought to lower cutting rate.  CNC Milling CNC Machining