Common calculation formulas for CNC machining (2)

　5. Calculation of escape hole

Φ＝√2R2　　　　　　X、Ｙ＝D/4

Φ: diameter of escape hole (mm) R tool radius (mm) D: tool diameter (mm)

Example. It is known that a mold cavity needs to be processed with an escape angle (as shown in the figure). CNC computer gong processing is the driving part of the CNC machine tool actuator, including spindle drive unit, feed unit, spindle motor and feed motor. Under the control of the numerical control device, it realizes the spindle and feed drive through the electric or electro-hydraulic servo system. When several feeds are linked, the processing of positioning, straight line, plane curve and space curve can be completed. Huizhou CNC machining tools for CNC milling are called CNC milling machines or CNC machining centers. The lathe that performs numerical control turning processing is called a numerical control turning center. CNC machining G code can be programmed manually, but usually the machining workshop uses CAM (computer-aided manufacturing) software to automatically read CAD (computer-aided design) files and generate G-code programs to control CNC machine tools. Shenzhen CNC machining is actually a numerical control milling machine. In Guangzhou, Jiangsu, Zhejiang and Shanghai, it is called a "CNC machining center", which is an automated machine tool equipped with a program control system. , (Numerical Control Machine Tool) is the abbreviation of Computer numerical control (Computer numerical control), which is an automated machine tool controlled by a program. The control system can logically process a program with control codes or other symbolic instructions, and decode it by a computer, so that the machine tool can operate and process parts. The rough material is processed into semi-finished finished parts by cutting tools.

The milling cutter used is &PHOTOSHOPi;10; may the escape angle hole be the smallest

For what? What are the coordinates of the center of the circle?

Φ=√ 2R2

Φ=√2＊52

Φ=7.1(mm)

X, Y = D/4

X, Y = 10/4

X, Y = 2.5 mm

The coordinates of the center of the circle are (2.5, -2.5)

　　 VI. Calculation of reclaiming amount

Q=(ae*ap*F)/1000

Ｑ: Reclaiming amount (cm3/min)　　　ae: XYpitch(mm)ap: Zpitch(mm)

Example. Knowing that a die must be processed with a cavity equal height, the XYpitch of the Φ35R5 knife is 60% of the tool, and each layer cuts 1.5mm, and the feed rate is 2000mm/min. What is the amount of material taken for this tool?

Q=(ae*ap*F)/1000

Ｑ＝35*0.6*1.5*2000/1000

Ｑ＝63 cm3/min

7. Calculation of feed per edge

Fz=hm * √(D/ap)

Fz: Implementation of the feed per blade hm: Theoretical feed per blade ap: Zpitch(mm)

D: Blade diameter (mm)

Example (provided that the depo XYpitch is 60% of the tool)

For the depoΦ35R5 knife, the cutting NAK80 material (Material) hm is 0.15mm, and the Z-axis cutting depth is 1.5mm. What is the feed per edge?

Fz=hm * √(D/ap)

Fz＝0.2*√10/1.5

Fz=0.5mm

Die edge processing method

Cutting depth of knife edge = plate thickness-knife edge height + drill point (0.3D)

D represents tool diameter

Drill bit drilling time formula

T(min)=L(min)/N(rpm)*f(mm/rev)

=πDL/1000vf

L: the total length of the drill hole 　　　 N: the number of revolutions 　　　 f: feed coefficient

D: drill diameter 　　　v: cutting speed

As shown in the figure, "Depth of the hole l"" Full length of the drill hole L", then L = l＋D/3

T=L/Nf=πDL/1000vf

Coefficient table f Diameter mm　　　 feed mm/rev

1.6~3.2 0.025~0.075

3.2~6.4　　　　 0.05~0.15

6.4~12.8　　 0.10~0.25

12.8~25　　　　 0.175~0.375

25 or more　　　　　 0.376~0.625

Tube tooth calculation formula

1 inch = 25.4mm = 8 points

25.4/tooth number=tooth pitch

For example, 　　　25.4/18=1.414　　　tooth pitch is 5/16 taps

Horsepower (commonly known as horsepower) (gun drill)

W=Md*N/97.410

W: Required power (KW)

Md: Torque (kg-cm)

N: Number of revolutions (r.p. m)

The torque calculation formula is as follows:

Md=1/20*f*ps*

f is the feed mm/rev coefficient

r is the drill radius match (mm)

α: Cutting resistance ratio (the value obtained by comparing two numbers) ps. At small feeds, the general steel is 500kg/㎡; the general cast iron is 300kg/㎡

Have you remembered the above CNC machining formula? I hope the cavity machining feed and cutting amount will be helpful to your work!