CN103438856A

CN103438856A - Measuring method for front angle of circumferential edge of spiral groove numerical control end mill

Info

Publication number: CN103438856A
Application number: CN2013104247140A
Authority: CN
Inventors: 唐臣升; 郭志涛; 于江; 康秋; 李研; 王玉娇; 马达; 于冬梅
Original assignee: Shenyang Aircraft Industry Group Co Ltd
Current assignee: Shenyang Aircraft Industry Group Co Ltd
Priority date: 2013-09-18
Filing date: 2013-09-18
Publication date: 2013-12-11
Anticipated expiration: 2033-09-18
Also published as: CN103438856B

Abstract

The invention provides a measuring method for a front angle of a circumferential edge of a spiral groove numerical control end mill. The measuring method comprises the following steps: calculating accurate measured length d of the front angle of the circumferential edge on a front knife face, i.e., d=d'-r; calculating projected length l of the accurate measured length of the front angle of the circumferential edge on a basal plane, i.e., l=l'-r-r*sin(arccos((l'-r)/d)); finally obtaining the front angle gamma of the circumferential edge, i.e., an included angle of the accurate measured length d, serving as a hypotenuse, of the front angle on the front knife face and the projected length l, serving as an adjacent side, of the accurate measured length of the front angle on the basal plane, wherein gamma=arcsin (l/d)=arcsin ((l'-r-r*sin(arccos((l'-r)/d)))/(d'-r)). The measuring error obtained by the measuring method is much smaller than the measuring error obtained by using the conventional measuring method.

Description

The measuring method of helicla flute numerical control end mill circumference angle of cutting edge

Technical field

The present invention relates to a kind of measuring method of helicla flute numerical control end mill circumference angle of cutting edge, belong to field of machining.

Background technology

Along with numerically-controlled machine, especially CNC milling machine is universal, and the application of numerical control end mill is also more and more extensive, and demand is also increasing, and the structure of most of numerical control end mills is the helicla flute numerical control end mill.Application due to typical difficult-to-machine materials such as titanium alloy, high temperature alloy, super-strength steel, make present stage also more and more higher to the requirement of numerical control end mill cutting ability.And the cutting ability of cutter is main relevant with the structural parameters of cutter except cutter material, wherein topmost structural parameters are numerical control end mill circumference angle of cutting edge, and it directly affects cutting ability and the serviceable life of cutter.Because the rake face of spiral cutting sword is spiral camber, can't Measurement accuracy, can only be indirectly, approximate measurement, therefore cutting ability that can accurately stoichiometric number control slotting cutter reality, affect research and application to numerical control end mill, more affected working (machining) efficiency and the precision of the typical difficult-to-machine materials such as titanium alloy, high temperature alloy, super-strength steel.

The measuring method of traditional helicla flute numerical control end mill circumference angle of cutting edge is to take the angle that the actual measurement length of anterior angle on rake face is adjacent side as hypotenuse, the projected length of actual measurement length on basal plane of anterior angle on rake face of take, i.e. arccos(l ＇ ÷ d ＇).Above-mentioned measuring method measuring error is larger.

Summary of the invention

For above deficiency, the invention provides a kind of measuring method of helicla flute numerical control end mill circumference angle of cutting edge.

Technical scheme of the present invention: the measuring method of helicla flute numerical control end mill circumference angle of cutting edge is achieved through the following technical solutions:

(1) calculate the Measurement accuracy length d of circumference angle of cutting edge on rake face: the measurement length d ＇ by the actual anterior angle recorded on rake face deducts the arc radius r at a point of a knife place, i.e. d=d ＇-r;

(2) calculate the projected length l of Measurement accuracy length on basal plane of circumference angle of cutting edge: the projected length l ＇ of the actual measurement length by anterior angle on rake face on basal plane deducts the arc radius r at a point of a knife place, deducting one, to take the Measurement accuracy length d of anterior angle on rake face be hypotenuse again, the projected length l ＇ of the actual measurement length of anterior angle on rake face on basal plane of take deducts the product of the arc radius r at the sine value of the angle that the difference of the arc radius r at a point of a knife place is adjacent side and point of a knife place, be l=l ＇-r-r * sin(arccos((l ＇-r) ÷ d)),

(3) circumference angle of cutting edge γ be take the angle that the Measurement accuracy length d of anterior angle on rake face be adjacent side as hypotenuse, the projected length l of Measurement accuracy length on basal plane of anterior angle of take, γ=arcsin(l ÷ d) =arcsin((l ＇-r-r * sin(arccos((l ＇-r) ÷ d))) ÷ (d ＇-r)).

Beneficial effect of the present invention: the measuring error that adopts the present invention to obtain is little more a lot of than the measuring error that adopts traditional measurement method to obtain, especially the absolute value in anterior angle approaches in 0 °, can better meet the needs of numerical control end mill Manufacture and application technology.

The accompanying drawing explanation

Fig. 1 is helicla flute numerical control end mill front view.

The A-A line cut-open view that Fig. 2 is Fig. 1.

The local enlarged diagram that Fig. 3 is I section in Fig. 2.

The 1-blade; The 2-shank; The 3-helix angle; 4-circumference angle of cutting edge; Basal plane in 6-helical edges measurement of angle stationary reference frame and the intersection of A-A section; Cutting plane in 7-helical edges measurement of angle stationary reference frame and the intersection of A-A section; The Measurement accuracy length of 8-circumference angle of cutting edge on rake face; The actual measurement length of 9-circumference angle of cutting edge on rake face; The Measurement accuracy length projected length on basal plane of 10-circumference angle of cutting edge on rake face; The actual measurement length projected length on basal plane of 11-circumference angle of cutting edge on rake face; The anterior angle that the actual measurement of 12-cutter goes out; The 13-difference; The arc radius at 14-point of a knife place.

Embodiment

The present embodiment be take and measured one diameter is measured to the 4 sword helicla flute numerical control end mills that arc radius that length is 0.6mm, point of a knife place is 0.05mm as 20mm, helix angle as 40 °, circumference angle of cutting edge as 10 °, anterior angle are theoretical be example, as shown in Figure 1 to Figure 3.The measurement length d ＇ of the actual anterior angle recorded on rake face is 0.608mm, the projected length l ＇ of the actual measurement length of circumference angle of cutting edge on rake face on basal plane is 0.605mm, the computing method according to this invention show that it is 9.82 ° that the circumference angle of cutting edge of this cutter obtains measured value, and error is only 0.18 °.And adopt traditional computing method, the circumference angle of cutting edge is to take the angle that the actual measurement length of anterior angle on rake face is adjacent side as hypotenuse, the projected length of actual measurement length on basal plane of anterior angle on rake face of take, this angle is arccos(l ＇ ÷ d ＇)=5.69 °, error amount is 4.31 °.From the measurement result of this embodiment, measuring error of the present invention will be far smaller than the measuring error that adopts classic method to obtain.

Claims

1. the measuring method of helicla flute numerical control end mill circumference angle of cutting edge is characterized in that being achieved through the following technical solutions:

(1) calculate the Measurement accuracy length d (8) of circumference angle of cutting edge on rake face: the measurement length d ＇ (9) by the actual anterior angle recorded on rake face deducts the arc radius r(14 at a point of a knife place), i.e. d=d ＇-r;

(2) calculate the projected length l(10 of Measurement accuracy length on basal plane of circumference angle of cutting edge): the projected length l ＇ (11) of the actual measurement length by anterior angle on rake face on basal plane deducts the arc radius r(14 at a point of a knife place), deducting one, to take the Measurement accuracy length d (8) of anterior angle on rake face be hypotenuse again, the projected length l ＇ (11) of the actual measurement length of anterior angle on rake face on basal plane of take deducts the arc radius r(14 at a point of a knife place) the sine value of the difference angle that is adjacent side and the arc radius r(14 at point of a knife place) product, be l=l ＇-r-r * sin(arccos((l ＇-r) ÷ d)),

(3) circumference angle of cutting edge γ be take the Measurement accuracy length d (8) of anterior angle on rake face as hypotenuse, the projected length l(10 of Measurement accuracy length on basal plane of anterior angle of take) be the angle of adjacent side, γ=arcsin(l ÷ d) =arcsin((l ＇-r-r * sin(arccos((l ＇-r) ÷ d))) ÷ (d ＇-r)).