CN106346058A - Eccentricity extraction method for micro-milling cutter - Google Patents

Abstract

The invention discloses an eccentricity extraction method for a micro-milling cutter. The method comprises the following steps: 1) obtaining holder outer contour play eccentricity data of a micro-milling cutter through a laser displacement sensor I, and obtaining bottom outer contour play eccentricity data of the milling cutter through a laser displacement sensor II; 2) collecting the holder outer contour play eccentricity data of the micro-milling cutter and the bottom outer contour play eccentricity data of the micro-milling cutter within one cycle; and 3) extracting the eccentricity of the micro-milling cutter according to the formula shown in the specification, wherein gamma0 is the eccentric angle of the cutter, R0 is the eccentric distance of the cutter, R is the radius of the cutter, and Delta h, gamma1 and gamma2 are obtained through step 2). The method disclosed by the invention is simple and convenient to operate.

Description

A kind of offset extracting method of micro- milling cutter

Technical field

The invention belongs to micro- Milling Process technical field, the offset extraction side of more particularly to a kind of micro- milling cutter Method.

Background technology

In various fields, the demand of high-precision minitype part is constantly increased severely now, especially in Aero-Space, life The fields such as thing medical science, telecommunications and green technology.Micro- Milling Process technology has it in terms of the miniature parts of processed complex Unique advantage, because the appearance of micro- Milling Process technology is relatively later, and has it peculiar with respect to macroscopical Milling Process technology The characteristic such as dimensional effect, lot of domestic and foreign scholar studies to the processing mechanism of its milling process one after another, mainly includes milling Cut the modeling of power, modeling of surface topography etc., at present for micro- Milling Process study mechanism also in developmental stage.In micro- milling In the research process of processing mechanism, the offset of cutter is the key variables of impact model exactness, thus accurately extracting cutter Offset seems most important.

The bias of cutter is generally regarded as the centre of gyration of main shaft to process with the deviation of the geometric center of cutter, and is based on The geometry of cutter is complete or error be less than offset it is assumed that the offset of extraction is the value of the nearly bottom of cutter.Its In, cutter deflection amount mainly includes two parameters: one, cutter deflection is apart from r₀(refer to main shaft rotation center and cutter geometric center Offset distance)；2nd, cutter deflection angle γ₀(referring to the angle between the direction of cutter deviation and adjacent nearest cutter tooth).For The extraction of this two parameters, cutter deflection is relatively easy away from extracting, and cutter deflection angle extraction has certain difficulty.

The method extracted with regard to offset at present has many kinds, comprising: substitute into Milling Force mould using Milling Force experimental data Type is reversely demarcated；The difference substitution theoretical model being measured using amesdial between each pirouette radius is solved； Surface topography using actual measurement is analyzed reversely demarcating with its theoretical model.It is seen that, above-mentioned offset extracts Method all relates to theoretical model, and the precision of extraction has very big dependence, extraction side to model and numerical computation method etc. Method is complicated, complex operation, and difficulty is larger.

Content of the invention

The present invention provides a kind of offset of micro- milling cutter to extract for solving technical problem present in known technology Method, the method is simple, is easy to operate.

The present invention is adopted the technical scheme that by solving technical problem present in known technology: a kind of micro- milling cutter Offset extracting method, using following steps:

One) laser displacement sensor is adopted to obtain micro- milling handle outline jerk value data, using laser displacement sensing Device obtains milling cutter bottom outline jerk value data, described laser displacement sensor and described laser displacement sensor Measurement direction is vertical with the rotation centerline of cutter spindle and residing phase place is identical；

Two) the micro- milling handle outline jerk value data in collection a cycle and micro- milling cutter bottom outline jerk value Data；

Three) offset of the micro- milling cutter of extraction:

${\mathrm{\γ}}_0=\arcsin \frac{\mathrm{\δ}h*{\mathrm{sin\γ}}_1*{\mathrm{sin\γ}}_2}{r*({\mathrm{sin\γ}}_2-{\mathrm{sin\γ}}_1)}$

$r_0=\frac{\mathrm{\δ}h}{2}\sqrt{\frac{4*r^2-{\mathrm{\δh}}^2}{4*r^2*{\cos }^2{\mathrm{\γ}}_0-{\mathrm{\δh}}^2}}$

Wherein, γ₀- cutter deflection angle；r₀- cutter deflection distance；R- tool radius；δ h- be located at line of eccentricity both sides and Apart from the nearest cutter tooth c of line of eccentricity and cutter tooth f effective radius of clean-up difference, sense through laser displacement equal to cutter tooth c and cutter tooth f The difference of jerk value data during device, by step 2) obtain；γ₁- recently and be in eccentric positive axis region from line of eccentricity Cutter tooth c and cutter spindle centre of gyration o line and line of eccentricity be angle, equal to cutter tooth c through laser displacement sensor When corresponding moment t₂With handle of a knife range sensor most proximal end b when the laser displacement sensor corresponding moment t₁Time difference δ t₁ It is multiplied by speed of cutter spindle, speed of cutter spindle is it is known that time difference δ t₁Step 2 can be passed through) obtain；γ₂- nearest from line of eccentricity And it is in the angle of cutter tooth f in eccentric negative semiaxis region and cutter spindle centre of gyration o line and line of eccentricity be, equal to cutter tooth F is through the moment t of laser displacement sensor₄Corresponding through laser displacement sensor with handle of a knife range sensor distalmost end e Moment t₃Time difference δ t₂It is multiplied by speed of cutter spindle, time difference δ t₂By step 2) obtain；

Described laser displacement sensor and described laser displacement sensor are fixed on the sensor stand being vertically arranged On, described sensor stand is fixed on horizontally disposed index dial, and described laser displacement sensor and described laser displacement pass Sensor measurement direction is radially arranged and residing phase place is identical along the same of described index dial；

Described index dial is arranged on z on precision displacement platform, and described z is arranged on x to accurate position to precision displacement platform Move on platform, described x is arranged on y on precision displacement platform to precision displacement platform, and described y fixes to accurate displacement workbench On micro- milling machine workbench.

Described x is to precision displacement platform, described y to precision displacement platform, described z to precision displacement platform and described indexing Disk is respectively provided with a hand crank.

The present invention has the advantages and positive effects that: the measurement data based on measurement sensor, is carried by geometrical calculation Take the offset of micro- milling cutter, it is easy to accomplish the accurate extraction to cutter deflection amount, operability is good, portable strong, can It is applied to micro- Milling Process technical field, practical, wide market is it is easy to popularization and application.

Brief description

The structural representation that Fig. 1 applies for the present invention；

Fig. 2 is the cutter deflection schematic diagram of the application present invention；

The position of adjustment sensor and sensor measurement direction relative main center of rotation when Fig. 3 applies for the present invention Schematic diagram；

The instrumentation plan of sensor when Fig. 4 applies for the present invention；

When Fig. 5 applies for the present invention, the measurement of sensor is illustrated and the offset of slight milling cutter extracts schematic diagram；

Fig. 6 is step 2 of the present invention) data graphs that gather.

In figure: 1, x is to precision displacement platform；2nd, hand crank；3rd, index dial；4th, laser displacement sensor；5th, sense Device support；6th, laser displacement sensor；7th, tool mounting；8th, micro- milling cutter；9th, hand crank；10th, hand crank；11st, z is to essence Close displacement platform；12nd, hand crank；13rd, y is to precision displacement platform；O, the cutter spindle centre of gyration；O ', cutter tooth partial geometry Center；O ", shank portion geometric center；" floor projection overlaps o ' with o；o₀, index dial geometric center；A, cutter tooth a position；c、 Cutter tooth c position；D, cutter tooth d position；F, cutter tooth f position；B, handle of a knife range sensor most proximal end；E, handle of a knife range sensor are farthest End.

Specific embodiment

For content of the invention, feature and effect of the present invention can be further appreciated that, hereby enumerate following examples, and coordinate accompanying drawing Describe in detail as follows:

Refer to Fig. 1～Fig. 6, a kind of offset extracting method of micro- milling cutter, using following steps:

One) micro- milling handle outline jerk value data is obtained using laser displacement sensor 6, passed using laser displacement Sensor 4 obtains milling cutter 8 bottom outline jerk value data, described laser displacement sensor 6 and described laser displacement sensing Phase place residing for device 4 is identical.Described micro- milling cutter 8 passes through tool mounting 7 clamping on cutter spindle.

Two) adopt micro- milling handle outline jerk value data and the micro- milling cutter bottom outline jerk value in a cycle Data.

Three) offset of the micro- milling cutter of extraction:

${\mathrm{\γ}}_0=\arcsin \frac{\mathrm{\δ}h*{\mathrm{sin\γ}}_1*{\mathrm{sin\γ}}_2}{r*({\mathrm{sin\γ}}_2-{\mathrm{sin\γ}}_1)}$

$r_0=\frac{\mathrm{\δ}h}{2}\sqrt{\frac{4*r^2-{\mathrm{\δh}}^2}{4*r^2*{\cos }^2{\mathrm{\γ}}_0-{\mathrm{\δh}}^2}}$

Wherein, γ₀- cutter deflection angle；r₀- cutter deflection distance；R- tool radius；δ h- be located at line of eccentricity both sides and Apart from the nearest cutter tooth c of line of eccentricity and cutter tooth f effective radius of clean-up difference, sense through laser displacement equal to cutter tooth c and cutter tooth f The difference of jerk value data during device 4, by step 2) can obtain；γ₁- recently and it is in eccentric positive axis from line of eccentricity Cutter tooth c in region and cutter spindle centre of gyration o line and the angle of line of eccentricity be, pass through laser displacement equal to cutter tooth c Corresponding moment t during sensor 4₂With handle of a knife range sensor most proximal end b when the laser displacement sensor 6 corresponding moment t₁When Between difference δ t₁It is multiplied by speed of cutter spindle, time difference δ t known to speed of cutter spindle₁Step 2 can be passed through) obtain；γ₂- from Line of eccentricity recently and is in the folder of cutter tooth f in eccentric negative semiaxis region and cutter spindle centre of gyration o line and line of eccentricity be Angle, equal to cutter tooth f through laser displacement sensor 4 moment t₄With handle of a knife range sensor distalmost end e through laser displacement The corresponding moment t of sensor 6₃Time difference δ t₂It is multiplied by speed of cutter spindle, time difference δ t known to the speed of mainshaft₂Pass through Step 2) obtain.

Described laser displacement sensor 6 and described laser displacement sensor 4 are fixed on the sensor stand being vertically arranged On 5, described sensor stand 5 is fixed on horizontally disposed index dial 3, described laser displacement sensor 6 and described laser position Displacement sensor 4 measurement direction is radially arranged and residing phase place is identical along the same of described index dial 3, specifically, in order to protect Demonstrate,prove described laser displacement sensor 6 and described laser displacement sensor 4 to be fetched data be the data of same phase place, must ensure The measurement direction of described laser displacement sensor 6 and described laser displacement sensor 4 in same vertical plane, be parallel to each other And vertical with cutter spindle rotation centerline, in addition to highly, remaining is all consistent two sensor mounting location.

Described index dial 3 is arranged on z on precision displacement platform 11, and described z is arranged on x to essence to precision displacement platform 11 On close displacement platform 1, described x is arranged on y on precision displacement platform 13 to precision displacement platform 1, and described y is to accurate displacement work Station 13 is fixed on micro- milling machine workbench.

In the present embodiment, in order to strengthen operability, described x puts down to precision displacement platform 1, described y to accurate displacement Platform 13, described z are respectively provided with a hand crank 2,12,10 and 9 to precision displacement platform 11 and described index dial 3.

Specific operation process divides three parts:

One) sensing station adjustment

First pass through hand crank 10 adjustment z and make described laser displacement sensor 6 and institute to accurate displacement workbench 11 State laser displacement sensor 4 and be respectively aligned to micro- milling handle and micro- milling cutter bottom, then manually crank 2,12 adjustment x to Precision displacement platform 1 and y, to precision displacement platform 13, make described laser displacement sensor 6 and described laser displacement sensor 4 correct positions being located in its range.

Then start cutter spindle, rotational speed omega, manually crank 9 adjustment index dial 3 make described laser displacement sensing The measurement data of device 6 peak-to-valley difference in a cycle is minimum, that is, think described laser displacement sensor 6 and described laser Displacement transducer 4 measurement direction is vertical with the rotation centerline of cutter spindle, and adjustment process see Fig. 3.

Two) measurement signal collection

After cutter spindle starts, open described laser displacement sensor 6 and described laser displacement sensor 4, gather one The measurement signal of individual complete cycle, as shown in Figure 6.

Three) cutter deflection amount is extracted

As shown in fig. 6, the data of laser displacement sensor 6 collection is dotted line, wherein handle of a knife range sensor most proximal end b Jerk value when laser displacement sensor 6 is valley, handle of a knife range sensor distalmost end e through laser displacement sensor Jerk value when 6 is peak value, the position t of place time shafts₁With t₃Determine, the data of same laser displacement sensor 4 collection is Solid line, wherein from line of eccentricity be recently and the cutter tooth c that is in eccentric positive axis region through laser displacement sensor 4 when jump Momentum is valley, from line of eccentricity be recently and when being in cutter tooth f in eccentric negative semiaxis region through laser displacement sensor 4 Jerk value is valley, and be located time shaft position t₂With t₄Can also determine, such that it is able to know δ t₁=t₂-t₁、δt₂=t₄-t₃ With δ h.

As shown in figure 5, γ₁With γ₂γ can be expressed as₁=ω * δ t₁、γ₁=ω * δ t₁, make boost linePerpendicular to line of eccentricity be and intersection point is m and n, then by geometrical relationship,WithIt is represented by AndIt is known that such that it is able to obtain cutter deflection angle γ₀.Wherein WithIt is represented by againAndIt is known that cutter deflection angle γ₀Obtain from above, such that it is able to obtain cutter deflection away from r₀.

Although being described to the preferred embodiments of the present invention above in conjunction with accompanying drawing, the invention is not limited in The specific embodiment stated, above-mentioned specific embodiment is only schematically, is not restricted, this area common Technical staff, under the enlightenment of the present invention, in the case of without departing from present inventive concept and scope of the claimed protection, also may be used To make a lot of forms, these belong within protection scope of the present invention.

Claims (2)

1. a kind of offset extracting method of micro- milling cutter is it is characterised in that adopt following steps:

One) laser displacement sensor is adopted to obtain micro- milling handle outline jerk value data, using laser displacement sensor Obtain milling cutter bottom outline jerk value data, described laser displacement sensor and the measurement of described laser displacement sensor Direction is vertical with the rotation centerline of cutter spindle and residing phase place is identical；

Two) the micro- milling handle outline jerk value data in collection a cycle and micro- milling cutter bottom outline jerk value number According to；

Three) offset of the micro- milling cutter of extraction:

${\mathrm{\γ}}_0=arcsin\frac{\mathrm{\δ}h*{\mathrm{sin\γ}}_1*{\mathrm{sin\γ}}_2}{r*({\mathrm{sin\γ}}_2-{\mathrm{sin\γ}}_1)}$

$r_0=\frac{\mathrm{\δ}h}{2}\sqrt{\frac{4*r^2-{\mathrm{\δh}}^2}{4*r^2*{\cos }^2{\mathrm{\γ}}_0-{\mathrm{\δh}}^2}}$

Wherein, γ₀- cutter deflection angle；r₀- cutter deflection distance；R- tool radius；δ h- is located at line of eccentricity both sides and distance The nearest cutter tooth c of line of eccentricity and cutter tooth f effective radius of clean-up difference, equal to cutter tooth c and cutter tooth f through laser displacement sensor When jerk value data difference, by step 2) obtain；γ₁- recently and it is in the knife in eccentric positive axis region from line of eccentricity The angle of tooth c and cutter spindle centre of gyration o line and line of eccentricity be, equal to cutter tooth c when the laser displacement sensor pair Should moment t₂With handle of a knife range sensor most proximal end b when the laser displacement sensor corresponding moment t₁Time difference δ t₁It is multiplied by Speed of cutter spindle, speed of cutter spindle is it is known that time difference δ t₁Step 2 can be passed through) obtain；γ₂- recently and locate from line of eccentricity Cutter tooth f in eccentric negative semiaxis region and the angle of cutter spindle centre of gyration o line and line of eccentricity be, equal to cutter tooth f warp Cross the moment t of laser displacement sensor₄With handle of a knife range sensor distalmost end e through laser displacement sensor to corresponding when Carve t₃Time difference δ t₂It is multiplied by speed of cutter spindle, time difference δ t₂By step 2) obtain；

Described laser displacement sensor and described laser displacement sensor are fixed on the sensor stand being vertically arranged, institute State sensor stand to be fixed on horizontally disposed index dial, described laser displacement sensor and described laser displacement sensor Measurement direction is radially arranged and residing phase place is identical along the same of described index dial；

Described index dial is arranged on z on precision displacement platform, and described z is arranged on x to precision displacement platform and puts down to accurate displacement On platform, described x is arranged on y on precision displacement platform to precision displacement platform, and described y is fixed on micro- to accurate displacement workbench On milling machine workbench.

2. the offset extracting method of micro- milling cutter according to claim 1 is it is characterised in that described x is to accurate position Move platform, described y is respectively provided with a hand crank to precision displacement platform, described z to precision displacement platform and described index dial.