How does dosage of CNC Milling cutting choose cutting dosage

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When how the choice of dosage of CNC Milling cutting chooses cutting dosage to machine a spare parts on numerical control machine tool, cutting dosage enrolls beforehand in the program, in normal treatment the circumstance falls, do not grant to change artificially. Trying treatment only or appear when unusual situation. Ability passes rate adjustment knob or electric handwheel adjusts cutting dosage. The cutting dosage that because this program is medium,chooses should be first-rate, reasonable cutting dosage. Life of the treatment precision that just can raise numerical control machine tool so only, cutting tool and productivity, reduce finished cost. The factor that affects cutting dosage has: The choice of dosage of machine tool cutting must be in machine tool advocate in transmission power, feed drive power and limits of main shaft rotate speed, feed speed limits. The tigidity of system of workpiece of — of cutting tool of machine tool — is the main factor that limits cutting dosage. The choice of cutting dosage should make system of workpiece of — of cutting tool of machine tool — does not produce bigger “ brace up quiver ” . If the thermal stability of the machine tool is good, heat is out of shape small, can increase cutting dosage appropriately. Material of cutting tool cutting tool is the main factor that affects cutting dosage. The function that expressing 6-2 is material of commonly used cutting tool is compared. The cutting tool that place of numerical control machine tool uses is used more but dislocation razor blade (machine clip razor blade) have certain life. In the material of machine clip razor blade and shape size must suit with the cutting speed in the program and feed photograph and stocking cutting tool parameter, go. The parameter of standard razor blade consults concerned manual reachs trade catalogue please. Biao 6-2 Chang Yong Dao Ju Cai Liao De Xing Neng Bi Jiao Dao Ju Cai Liao Qie Xiao Su Du Nai Mo Xing Ying Du Ying Du Sui Wen Du Bian Hua Gao Su Gang Zui Di Zui Cha Zui Di Zui Da Ying Zhi He Jin Di Cha Di Da Tao Ci Dao Pian Zhong Zhong Zhong Zhong Jin Gang Shi Gao Hao Gao Xiao Gong Jian Bu Tong De Gong Jian Cai Liao Yao Cai Yong Yu Zhi Shi Ying De Dao Ju Cai Liao 、 Dao Pian Lei Xing ， Should notice but cutting sex. But the sign with cutting good sex is, form effectively cut bits, have lesser cutting tool to wear away to machine quality with better appearance at the same time. Volume of higher cutting rate, minor back penetration of a cutting tool and feed, can obtain better exterior surface roughness. Volume of reasonable constant cutting rate, minor back penetration of a cutting tool and feed can get taller treatment precision. Cooling fluid cooling fluid has refrigeration and lubricant effect at the same time. Take away the heat in metal cutting that cutting process produces, reduce the temperature rise of workpiece, cutting tool, clamping apparatus and machine tool, the attrition that reduces cutting tool and workpiece and wear away, improve cutting tool life and quality of workpiece surface treatment. After use cooling fluid, can increase cutting dosage normally. Cooling fluid must change regularly, corrode machine tool slideway or other part because of its ageing in case, especially water-solubility cooling fluid. Above told about the influence of machine tool, cutting tool, workpiece, cooling fluid to cutting dosage. The choice principle of cutting dosage is referenced 2.

3.

3 with 4.

2.

The content of 2, the cutting dosage that milling treatment basically discusses below chooses a principle. The cutting dosage that milling machines includes: Quantity of penetration of a cutting tool of cutting speed, feed speed, back and side penetration of a cutting tool are measured. Set out from cutting tool durability, the selection method of cutting dosage is: Choose to bear quantity of penetration of a cutting tool or amount of side penetration of a cutting tool first, choose feed career next, determine cutting rate finally. 1.

The cut size that back penetration of a cutting tool measures Notype Corsiva ";" >ap or penetration of a cutting tool of back of Notype Corsiva ";" >ae of quantity of side penetration of a cutting tool estimates Notype Corsiva ";" >ap to be parallel to be measured at line of mill cutter shaft, the unit is ㎜. When Duan Xi, notype Corsiva ";" >ap is cut deepness; And when circumferential milling, to be machined exterior width. The cut size that Notype Corsiva ";" >ae of quantity of side penetration of a cutting tool measures for line of cutter shaft of perpendicular Yu Xi, the unit is ㎜. When Duan Xi, notype Corsiva ";" >ae is spent to be machined to express bizygomatic breadth; And when circumferential milling, notype Corsiva ";" >ae is cut deepness, see graph 6-29. Back penetration of a cutting tool measures or side penetration of a cutting tool measures choose basically mix by mental allowance the requirement decision of pair of surface quality: ① is worth a requirement to be Ra=12 when workpiece surface surface roughness.

When 5 ～ 25μm, if circumferential milling mental allowance is less than 5 ㎜, mental allowance of end panel milling is less than 6 ㎜, primary feed can achieve thick mill requirement. But in surplus bigger, machining complex is rigid when poorer or machine tool power is insufficient, can divide finish for two feed. ② is worth a requirement to be Ra=3 when workpiece surface surface roughness.

2 ～ 12.

When 5μm, part of one's job is thick mill and half essence mill two paces undertake. Penetration of a cutting tool of the back when thick mill is measured or quantity of side penetration of a cutting tool chooses ibid. Stay after thick mill 0.

5 ～ 1.

0 ㎜ surplus, in the excision when half essence mill. ③ is worth a requirement to be Ra=0 when workpiece surface surface roughness.

8 ～ 3.

When 2μm, part of one's job is mill of thick mill, half essence mill, essence of life 3 paces undertake. Penetration of a cutting tool of the back when half essence mill is measured or quantity of side penetration of a cutting tool is taken 1.

2 ㎜ of 5 ～ ; When mill of essence of life, quantity of penetration of a cutting tool of circumferential mill side is taken 0.

3 ～ 0.

5 ㎜, quantity of penetration of a cutting tool of face mill the back of a knife blade is taken 0.

1 ㎜ of 5 ～ . 2.

Feed F and the feed F that the choice milling of speed Vf machines feed (㎜ / R) it is to show cutting tool turns a week, the opposite displacement of workpiece and way of movement of feed of cutting tool edge is measured; Feed speed Vf (㎜ / Min) the opposite displacement quantity that is the workpiece inside unit time and direction of feed of milling cutter edge. The relation of feed speed and feed is Vf=nf (N is milling cutter rotate speed, unit R /min) . Feed and feed speed are the important parameter in dosage of cutting of CNC Milling treatment, according to the exterior surface roughness of the spare parts, treatment precision requirement, cutting tool reachs the element such as workpiece material, manual chooses referenced cutting dosage or age through choosing every feed Fz, again according to formulary F=Zfz (Z is counted for mill tooth) computation. Every tine feed the element such as surface roughness of surface of material of the chooses material of main basis workpiece mechanical property of Fz, cutting tool, workpiece. Workpiece data strength and hardness are taller, fz is smaller; Jump over conversely big. The prep above of every tine feed of hard alloy milling cutter is congener high-speed steel milling cutter. Demand of workpiece surface surface roughness is higher, fz is smaller. Every tine feed can consult watch 6-3 is chosen surely really. When workpiece tigidity difference or cutting tool intensity are low, should take lesser cost. Reference of every tine feed is worth watch 6-3 milling cutter steel of milling cutter of hard alloy of milling cutter of high-speed steel of milling cutter of hard alloy of milling cutter of high-speed steel of mill of essence of thick mill of ㎜ of workpiece material Fz/ 0.

10 ～ 0.

15 0.

10 ～ 0.

25 0.

02 ～ 0.

05 0.

10 ～ 0.

15 cast-iron 0.

12 ～ 0.

20 0.

15 ～ 0.

30 3.

Quantity of quantity of penetration of a cutting tool of feed of the durability of the cutting speed Vc of milling of cutting speed Vc and cutting tool, every tine, back, side penetration of a cutting tool and mill tooth count inverse ratio, and become direct ratio with milling cutter diameter. Its reason is when increasing with Z when Fz, Notype Corsiva ";" >ap, Notype Corsiva ";" >ae, edge bear increases, and the tine that works at the same time is counted also grow in quantity, make heat in metal cutting increases, cutting tool wears away accelerate, limitted cutting rate thereby rise. Allow to use inferior cutting rate to raise cutting tool durability. But increase milling cutter diameter ameliorable medicinal powder hot condition, can raise cutting rate. The cutting speed Vc that milling machines can consult watch 6-4 is chosen, also can consult about cutting dosage the experience formula in manual is chosen through computation. CNC Milling