CN106141808A - A kind of change cutting-depth adjusting device and radial cutting parameter optimization process - Google Patents

Abstract

The present invention relates to micro processing field, it is specifically related to a kind of change cutting-depth adjusting device and radial cutting parameter optimization process, including the dynamometer being arranged on platen, pressing plate and machine table, described machine table is arranged on dynamometer by pressing plate, also include riser, supporting case, hanging pillar, tight fixed bolt and support transverse slat, described riser is vertically set on machine table upper front part, the present invention supports transverse slat position on hanging pillar by adjusting, and determine actual Working position by reading scale, highly shortened clamping and adjust the time, make operation more convenient；The present invention supports transverse slat and remains with certain angle, in that context it may be convenient to meets the adjustment of the radial cutting degree of depth, improves operating efficiency.

Description

A kind of change cutting-depth adjusting device and radial cutting parameter optimization process

Technical field

The present invention relates to micro processing field, be specifically related to a kind of change cutting-depth adjusting device and radial cutting parameter optimization work Process.

Background technology

In recent years, Digit Control Machine Tool and the development of cutter manufacture technology make micro-cutting become a kind of and see chi for three-dimensional Jie The effective means that degree parts manufacture, for other micro-fabrication technologies, it is high that micro-cutting has working (machining) efficiency, is manufactured into This is the lowest, can carry out the many advantages such as processing of complicated small three-dimensional profile, thus, it is the enabling tool of a kind of great potential, gesture Will be widely applied in fields such as biologic medical, instrument and meter, Aero-Space, intelligent micro robots.But, fine cut Cut in the course of processing selected cutting data and mostly be micron even submicron order, thus cutting parameter during micro-cutting It is most important for rationally selecting, International Periodicals " International Journal of Machine Tools and Manufacture " 2005 years volume 45 the 4th phase " Effects of the friction coefficient on the Minimum cutting thickness in micro cutting " in a literary composition by the radius of edge of cutter and workpiece and cutter Coefficient of friction between tool determines minimum thickness of cut, and obtains the approximate expression of minimum depth of cut, due to processed Parts overall dimensions at below 10mm, characteristic size at below 1mm, the now physical dimension of cutting edge roundness and the crystal grain of material Size is non-negligible for the impact of the course of processing, often along with the generation of scale effect in the course of processing, consequent The course of processing can be had an immense impact on by little cutting depth phenomenon, therefore minimum thickness of cut can not rely on merely theoretical expression, Needing to test by means of trial cut, the cutting-in support means in current experimentation uses plain clamp and fixture mostly, it is impossible to side The clamping degree of depth of regulation workpiece just, this makes troubles also to choosing of cutting parameter with optimizing further.

Summary of the invention

The technical problem to be solved be to provide a kind of easy to operate, carry high efficiency change cutting-depth adjusting device and Radial cutting parameter optimization method.By optimizing radial cutting parameter, solve in the minuteness milling course of processing Unit cutting force and The problem that cutter life controls；By obtaining the impact on Unit cutting force of the different cutting parameters based on fuzzy logic method, And determine the optimization process of the minuteness milling processing radial cutting degree of depth.

For solving above technical problem, the present invention adopts the following technical scheme that

Technical scheme one:

A kind of change cutting-depth adjusting device, including the dynamometer being arranged on platen, pressing plate and machine table, described processing Platform is arranged on dynamometer by pressing plate；Also including riser, supporting case, hanging pillar, tight fixed bolt and support transverse slat, described riser hangs down Directly it is arranged on machine table upper front part；Described supporting case is vertically set in the middle part of riser, and described hanging pillar is provided with dovetail groove and quarter Scale is noted, and described hanging pillar is located at inside supporting case, and is perpendicular to riser；Described support transverse slat is provided with dovetail slide block, described support Transverse slat is perpendicular to riser and is arranged on inside supporting case, and constitutes, with hanging pillar, the company of slip by the cooperation of dovetail slide block and dovetail groove Connecing, described support transverse slat upper end is provided with clamping groove, and described tight fixed bolt contacts through supporting case with supporting transverse slat；Described support Transverse slat is the most trapezoidal, and described support transverse slat upper sideline and horizontal line constitute angle beta, the span of described angle beta be 3 °～ 7°.Described tight fixed bolt is arranged in pairs, and is symmetrically distributed in described support transverse slat both sides.

Technical scheme two:

The radial cutting parameter optimization process step of the present invention is following, and (it is excellent that the device described in utilization carries out radial cutting parameter Change method):

1. minuteness milling Unit cutting force computation model is determined:

Workpiece is fixed in clamping groove by 101, slidably supports transverse slat, is fixed by support transverse slat by tight fixed bolt, reads hanging pillar On initial manufacture scale and record；

102 set up the milling cutter profile in the cutting cycle and the current milling cutter profile coordinate system cutting the cycle, and record is every time The peak value when material removed of cutting and cutting depth are continually changing, and it is defined as the non-cutting depth of maximum, it is denoted as h_max, Determine the non-cutting depth of maximum and feed engagement f_z, radial cutting degree of depth a_e, tool radius r_toolBetween relation:

$h_{max}=f_z\·cos\mathrm{\θ}=f_z\·\frac{\sqrt{2r_{tool}\·a_e-a_e^2}-f_z}{\sqrt{{r_{tool}}^2-2f_z\sqrt{2r_{tool}\·a_e-a_e^2}+{f_z}^2}}---\left(1\right);$

103 utilize the cutting force peak F that dynamometer (1) gathers_max, draw the cutting force k of unit are_c, i.e. minuteness milling unit Cutting force computation model reaches formula:

$k_c=\frac{F_{\max }}{a_p\·h_{\max }}=\frac{F_{\max }\·\sqrt{{r_{tool}}^2-2f_z\sqrt{2r_{tool}\·a_e-a_e^2}+{f_z}^2}}{a_p\·f_z\·(\sqrt{2r_{tool}\·a_e-a_e^2}-f_z)}---\left(2\right)$

Wherein a_pRepresent the axial cutting depth in working angles；

2. keep axial cutting depth constant, regulation sliding support transverse slat and then change radial cutting depth value, obtain different Unit cutting force under cutting parameter, obtains the relation between Unit cutting force and cutting data record:

Machining is grouped by 201, makes machining height equal to axial cutting depth a_p, the radial cutting degree of depth from 0 to 0.1mm is incremented by；

By dynamometer real time record cutting force data in 202 working angles, for acquisition and the Unit cutting force of cutting force peak value Calculating；

3. data based on record, use the method for fuzzy logic to carry out cutting parameter optimization:

301 draw the change curve of Unit cutting force according to the data of record, and are determined the sudden change on curve by its derivative value Point, i.e. cutting occur after such a point, and the change of Unit cutting force sharply increases, and defining this cutting depth corresponding to point is pole Limit cutting depth；

The record data of 302 pairs of different groups all process according to step 301, obtain the limit under different cutting parameter combination Cutting depth；

The matching degree of set is represented by 303 by the data of record by a numerical value degree of membership between 0 and 1, and selects With triangle and trapezoidal membership function as the obfuscation instrument of parameter, complete the Fuzzy processing of input variable；

The logical calculated of 304 ambiguity in definition rules, each fuzzy rule all uses " IF THEN " statement, different fuzzy rules Between use " AND " statement to connect, set up the fuzzy logic forecast model of minimum cutting depth；

305, using cutting speed and feed engagement as input variable, using minimum cutting depth as output variable, use region Center de-fuzzy method carries out de-fuzzy operation to the output variable under semantic description state, completes the deblurring of result of calculation Change；

4. reverse goes out the radial cutting degree of depth of the limit, utilizes radial cutting depth formula:

${a_e}^{\′}=r_{tool}-(r_{tool}-{h_m}^{\′})\·\sqrt{1-{\left(\frac{{h_m}^{\′}}{f_z}\right)}^2}---\left(3\right)$

Further optimization to radial direction cutting depth；A in formula_e' it is the radial cutting degree of depth optimized, r_toolTool diameter, h_m' give Determine the minimum cutting depth predictive value under cutting speed and feed engagement, f_zFeed of every rotation.

The precision employing formula of described fuzzy logic model:

$A=\frac{1}{N}\underset{1}{\overset{N}{\mathrm{\Σ}}}(1-\frac{\left|h_m^{\′}-{h_m}^{\′\′}\right|}{{h_m}^{\′\′}})\×100\%---\left(4\right)$

Calculate, wherein h_m" represent calculated minimum cutting depth value of calculation, h_m' represent obtain based on fuzzy logic model Minimum cutting depth predictive value, N represents test number (TN).

The positive effect of the present invention is as follows: the present invention supports transverse slat position on hanging pillar by adjusting, and by reading Scale determines actual Working position, highly shortened clamping and adjusts the time, makes operation more convenient；The present invention supports transverse slat and protects Leave certain angle, in that context it may be convenient to meet the adjustment of the radial cutting degree of depth, improve operating efficiency；Because of micro-cutting process shadow The factor of sound is numerous, and the more negligible factors in macro-scale is cut all can produce the biggest shadow to micro-cutting process Ringing, the especially existence of scale effect is macroscopic view cutting and the important difference of micro-cutting, in the premise that cutter and material determine Under, rationally selecting for avoiding scale effect to have great importance of cutting parameter；Cutting parameter of the present invention is excellent Change method has good versatility, may be used for different cutters and different materials, by reasonably Adjustment Tests platform, Can control workpiece material removal amount in cutting every time easily, cutting force data and series of computation by record can Obtain Unit cutting force corresponding under the different radial cutting degree of depth；The present invention is based on different cutting parameters and the unit of correspondence Cutting force can set up the minimum cutting depth forecast model under particular tool and material, when cutting parameter changes, based on this Model can obtain optimal radial cutting depth corresponding under new operating mode, it is achieved effective control of Unit cutting force, for improving Crudy, the generation and the raising cutter life that reduce heat in metal cutting are respectively provided with important meaning.

Accompanying drawing explanation

Fig. 1 is machine table structural representation of the present invention；

Fig. 2 is hanging pillar structural representation of the present invention；

Fig. 3 is riser structural representation of the present invention；

Fig. 4 is that the present invention supports transverse slat structural representation；

Fig. 5 is coordinate system schematic diagram of the present invention；

Fig. 6 is maximum of the present invention non-cutting depth schematic diagram；

Fig. 7 is radial cutting degree of depth schematic diagram of the present invention；

Fig. 8 is Unit cutting force Changing Pattern schematic diagram of the present invention；

Fig. 9 is that minimum cutting depth of the present invention determines schematic diagram；

Figure 10 is the schematic diagram of cutting speed of the present invention and degree of membership；

Figure 11 is the schematic diagram of feed engagement of the present invention and degree of membership；

Figure 12 is the schematic diagram of minimum cutting depth of the present invention and degree of membership；

Figure 13 is model prediction accuracy schematic diagram of the present invention；

Figure 14 is that the 2nd group of Unit cutting force of the present invention controls effect schematic diagram；

Figure 15 is that the 5th group of Unit cutting force of the present invention controls effect schematic diagram；

Figure 16 is that the 8th group of Unit cutting force of the present invention controls effect schematic diagram；

Figure 17 is forecast model output parameter value schematic diagram of the present invention；

In the drawings: 1 dynamometer, 2 pressing plates, 3 machine table, 4 risers, 5 supporting cases, 6 hanging pillars, 6-1 dovetail groove, 7 support transverse slat, 7-1 Dovetail slide block, 8 clamping grooves, 9 tight fixed bolts, W is the scale label on hanging pillar, and a is the radial cutting degree of depth, and b is 2mm milling cutter unit Cutting force, c is unit cutting force, and d is minimum cutting-in predictive value based on fuzzy logic model, and e is that minimum based on experiment is cut Deep value of calculation, f is second group of cutting test Unit cutting force in table 5, first group of cutting test Unit cutting force in g table 6, The 5th group of cutting test Unit cutting force in h table 5, second group of cutting test Unit cutting force in l table 6, in j table 5 Eight groups of cutting test Unit cutting forces, the 3rd group of cutting test Unit cutting force in k table 6, the material that W1 will be cut, W4 The excursion of Unit cutting force when cutting depth is 0.0247, the change model of Unit cutting force when W5 cutting depth is 0.0283 Enclose, the excursion of Unit cutting force when W6 cutting depth is 0.0650.

Detailed description of the invention

The present invention is described in detail with instantiation below in conjunction with the accompanying drawings.

One, the embodiment of apparatus of the present invention:

Embodiment 1

As shown in Figure 1,2,3, 4, a kind of change cutting-depth adjusting device, including the dynamometer 1 being arranged on platen, pressing plate 2 And machine table 3, described machine table 3 is arranged on dynamometer 1 by pressing plate 2；Also include riser 4, supporting case 5, hanging pillar 6, tight Determining bolt 9 and support transverse slat 7, described riser 4 is vertically set on machine table 3 upper front part；Described supporting case 5 is vertically set on vertical In the middle part of plate 4, described hanging pillar 6 is provided with dovetail groove 6-1 and scale mark, and it is internal that described hanging pillar 6 is located at supporting case 5, and is perpendicular to Riser 4；Described support transverse slat 7 is provided with dovetail slide block 7-1, and described support transverse slat 7 is perpendicular to riser 4 and is arranged on supporting case 5 inside, And be slidably connected with hanging pillar 6 composition by the cooperation of dovetail slide block 7-1 and dovetail groove 6-1, described support transverse slat 7 upper end is provided with dress Clip slot 8, described tight fixed bolt 9 contacts through supporting case 5 with supporting transverse slat 7；Described support transverse slat 7 is the most trapezoidal, described Supporting transverse slat 7 upper sideline and constitute angle beta with horizontal line, the span of described angle beta is 3 °～7 °.Described tight fixed bolt 9 becomes To setting, and it is symmetrically distributed in described support transverse slat 7 both sides.

In the present invention, clamping groove 8 uses corresponding tight fixed bolt to carry out pretension after clamping workpiece, firmly beforehand means with The firmly beforehand means of support transverse slat 7 is consistent.

Heretofore described support transverse slat 7 is the most trapezoidal, and described support transverse slat 7 upper sideline constitutes angle with horizontal line β, described angle beta needs to choose according to different processing, and selection range is 3 °～7 °, 10 °～15 °, 4 ° and 12 °.

The cross section of machine table 3 of the present invention is I shape.

Two, the embodiment of the inventive method:

Embodiment:

1. minuteness milling Unit cutting force computation model is determined:

Workpiece is fixed in clamping groove 8 by 101, slidably supports transverse slat 7, is fixed by support transverse slat 7 by tight fixed bolt 9, reads Initial manufacture scale on hanging pillar 6 record；

102 as shown in Figure 5,6, circle O₁For the milling cutter profile of (milling cutter turns over 180 °), O in the upper cutting cycle₂For currently cutting Cut the milling cutter profile in cycle.To justify O₁The center of circle be that initial point sets up coordinate system, O₁O₂For feed engagement, the district with PQR as summit Territory represents and cuts the material removed every time, and for milling, cutting depth is all continually changing, and wherein there is a peak Value, can use line segment PQ approximate representation in the drawings, be referred to as the non-cutting depth of maximum, be denoted as h_max, when this value of measuring is relative to cutter When radius is the least, ∠ RQP approximation can regard 90 ° as, now, and the non-cutting depth of maximum and feed engagement, the radial cutting degree of depth, cutter Have between radius and meet following relation:

$h_{max}=f_z\·cos\mathrm{\θ}=f_z\·\frac{\sqrt{2r_{tool}\·a_e-a_e^2}-f_z}{\sqrt{{r_{tool}}^2-2f_z\sqrt{2r_{tool}\·a_e-a_e^2}+{f_z}^2}}---\left(1\right)$

In above formula, f_zFor feed engagement, r_toolFor tool radius, a_eFor the radial cutting degree of depth, formula (1) discloses at cutter true In the case of Ding, the non-cutting depth of maximum and feed engagement and radial cutting degree of depth a_eRelevant.

103 for a cutting cycle, and cutting force can present " state slowly reduced after first sharply increasing ", profit The cutting force peak F gathered with dynamometer (1)_max, when cutting edge starts a cut through workpiece material, cutting force can steeply rise, and reaches Can be with a less rate reduction after a peak value, the non-cutting depth that peak value cutting force is corresponding when occurring is approximately equal to Big non-cutting depth, represents with PQ line in Fig. 6.Use a_pRepresent the axial cutting depth in working angles, then unit are cutting Power can be calculated as follows:

$k_c=\frac{F_{\max }}{a_p\·h_{\max }}=\frac{F_{\max }\·\sqrt{{r_{tool}}^2-2f_z\sqrt{2r_{tool}\·a_e-a_e^2}+{f_z}^2}}{a_p\·f_z\·(\sqrt{2r_{tool}\·a_e-a_e^2}-f_z)}---\left(2\right)$

Wherein, Unit cutting force k_cRepresent, be the main cutting force in the unit area of cut herein, F_maxFor in certain cutting cycle Peak value cutting force, h_maxFor the non-cutting depth of the maximum in working angles.Keep not when axial cutting depth based on above-mentioned model During change, unit are cutting force cutting depth non-with peak value cutting force and maximum is relevant, and the non-cutting depth of maximum is about footpath To the function of cutting depth, therefore, by changing the radial cutting degree of depth in the case of cutting speed and amount of feeding holding are constant Value changes the non-cutting depth of the maximum in working angles.

2. keep axial cutting depth constant, regulation sliding support transverse slat 7 and then change radial cutting depth value, obtain not With cutting parameter under Unit cutting force, obtain the relation between Unit cutting force and cutting data record:

201 for making optimization method have more universality, and the present invention uses the reducing mode to cutting depth, cutting is entered several times OK, cut the cutting parameter used the most different every time, but the material volume removed is identical, be a height equal to axially cutting Cut degree of depth a_p, the radial cutting degree of depth from 0 to 0.1mm be incremented by wedge shape, as it is shown in fig. 7, in Shi Yan selected by cutting parameter such as Shown in table 1.

During being gradually reduced along with the radial cutting degree of depth, Unit cutting force presents the trend being gradually increased, as Fig. 8,9 Shown in, and from the beginning of a certain position, the speedup of Unit cutting force is substantially accelerated, i.e. and Unit cutting force change curve exists one Critical point, when cutting depth corresponding at the radial cutting degree of depth is less than this critical point, Unit cutting force sharply increases.

By dynamometer 1 real time record cutting force data in 202 working angles, acquisition and unit for cutting force peak value are cut Cut the calculating of power.

3. data based on record, use the method for fuzzy logic to carry out cutting parameter optimization:

According to Unit cutting force acquisition methods can obtain the Changing Pattern of Unit cutting force under different tests group, unit is cut A more significantly turning point, when cutting occurs after such a point, the change of Unit cutting force is there is on the change curve of power Change sharply increases, and therefore, at this point, corresponding cutting depth can be regarded as limit cutting depth, in order to avoid serious yardstick Effect occurs, and in the actual course of processing, cutting depth parameter should be more than revaluate.

301 draw the change curve of Unit cutting force according to the data of record, and are determined on curve by its derivative value Catastrophe point, i.e. cutting occur after such a point, and the change of Unit cutting force sharply increases, and defines this cutting depth corresponding to point For limit cutting depth；

Each group test data in 302 pairs of tables 1 all carries out above process, and the limit under i.e. available different cutting parameter combinations is cut Cutting the degree of depth, result is as shown in table 2.

Table 1 cutting test parameter

The minimum cutting depth of cutting respectively organized by table 2

The matching degree of set is represented, such as table 3 by 303 by the data of record by a numerical value degree of membership between 0 and 1 Shown in, and select triangle and trapezoidal membership function as the obfuscation instrument of parameter, complete at the obfuscation of input variable Reason, the membership function of each parameter that segmentation completes is as shown in Figure 10,11,12.

The segmentation of table 3 input/output argument and semantic meaning representation

The logical calculated of 304 definition dependent blur rules, each fuzzy rule all uses " IF THEN " statement, and different is fuzzy Use " AND " statement to connect between rule, set up the fuzzy logic forecast model of minimum cutting depth, as shown in table 4；

Table 4 uses the fuzzy rule of semantic meaning representation

305, using cutting speed and feed engagement as input variable, using minimum cutting depth as output variable, use region Center de-fuzzy method has carried out de-fuzzy operation to the output variable under semantic description state, and complete result of calculation removes mould Gelatinizing.

4. the radial cutting degree of depth of the limit is gone out according to the minimum cutting depth that different parameters combination the is lower reverse that predicts the outcome, sharp Use radial cutting depth formula:

Further optimization to radial direction cutting depth；A in formula_e' it is the radial cutting degree of depth optimized, r_toolTool diameter, h_m' give Determine the minimum cutting depth predictive value under cutting speed and feed engagement, f_zFeed of every rotation.

In order to verify that the reliability of above-mentioned fuzzy logic model, cutting speed and feed engagement all randomly select, The predictive value of minimum cutting depth can be obtained, selected cutting parameter, based on fuzzy based on the fuzzy logic model set up The minimum cutting depth predictive value of logical model and Practical Calculation value are as shown in table 5.

The predictive value of the minimum cutting depth of table 5 and actual value

As shown in figure 13, minimum cutting depth predictive value based on fuzzy logic model and the actual survey that obtains according to confirmatory experiment Value contrasts.

Use h_m" represent based on the calculated minimum cutting depth value of calculation of test data, use h_m' represent and patrol based on fuzzy Collecting the minimum cutting depth predictive value that model obtains, N represents test number (TN), then use the minimum cutting depth that above method obtains Precision of prediction can be calculated as follows:Calculate the precision of model up to 96.4%.

When the radial cutting degree of depth is less than a_e' time can produce bigger Unit cutting force, therefore, in the actual course of processing, cut The value cutting the degree of depth should be more than this value.In order to verify the feasibility using above-mentioned optimization method, carry out a series of further The proving test of the constant cut degree of depth, in addition to the radial cutting degree of depth, the cutting parameter in process of the test and the 2nd, 5 in table 5 Identical with 8 groups, it is shown in Table 6.

The checking test that table 6 Unit cutting force controls

In cutting process, randomly select six points, and the Unit cutting force at these points has been calculated, in order to just Effect is controlled, herein by the 2nd in table 5, the Unit cutting force change of 5 and 8 groups in the Unit cutting force compared in checking test Rule Unit cutting force in table 6 contrasts, and result is as shown in Figure 14,15,16.And obtain final forecast model Output height value, as shown in figure 17.

In the cutting test using the radial cutting degree of depth optimized to carry out, Unit cutting force is without acute variation and the least The Unit cutting force value at turning point on each matched group Unit cutting force change curve.Use the above radial cutting degree of depth excellent Change method can realize controlling the purpose of Unit cutting force well, and this is for improving crudy, the generation of suppression heat in metal cutting, It is all highly important for improving cutter life etc..

The above embodiment is only the preferred embodiments of the present invention, and and the feasible enforcement of non-invention exhaustive.Right For persons skilled in the art, to its done any showing on the premise of without departing substantially from the principle of the invention and spirit The change being clear to, within all should being contemplated as falling with the claims of the present invention.

Claims (4)

1. become a cutting-depth adjusting device, including the dynamometer (1) being arranged on platen, pressing plate (2) and machine table (3), it is characterised in that: described machine table (3) is arranged on dynamometer (1) by pressing plate (2)；

Also including riser (4), supporting case (5), hanging pillar (6), tight fixed bolt (9) and support transverse slat (7), described riser (4) is vertical It is arranged on machine table (3) upper front part；Described supporting case (5) is vertically set on riser (4) middle part, and described hanging pillar (6) is provided with swallow Stern notch (6-1) and scale mark, it is internal that described hanging pillar (6) is located at supporting case (5), and is perpendicular to riser (4)；Described support horizontal stroke Plate (7) is provided with dovetail slide block (7-1), and described support transverse slat (7) is perpendicular to riser (4) and is arranged on supporting case (5) inside, and passes through The cooperation of dovetail slide block (7-1) and dovetail groove (6-1) is slidably connected with hanging pillar (6) composition, and described support transverse slat (7) upper end is provided with Clamping groove (8), described tight fixed bolt (9) contacts through supporting case (5) with supporting transverse slat (7)；

Described support transverse slat (7) is the most trapezoidal, and described support transverse slat (7) upper sideline constitutes angle beta, described angle with horizontal line The span of β is 3 °～7 °.

A kind of change cutting-depth adjusting device the most according to claim 1, it is characterised in that: described tight fixed bolt (9) sets in pairs Put, and be symmetrically distributed in described support transverse slat (7) both sides.

3. utilize the device described in claim 1 to carry out radial cutting parameter optimization process, it is characterised in that step is as follows:

1. minuteness milling Unit cutting force computation model is determined:

Workpiece is fixed in clamping groove (8) by 101, sliding support transverse slat (7), will support transverse slat (7) by tight fixed bolt (9) solid Fixed, read the initial manufacture scale label on hanging pillar (6) record；

102 set up the milling cutter profile in the cutting cycle and the current milling cutter profile coordinate system cutting the cycle, and record is every time The peak value when material removed of cutting and cutting depth are continually changing, and it is defined as the non-cutting depth of maximum, it is denoted as h_max, Determine the non-cutting depth of maximum and feed engagement f_z, radial cutting degree of depth a_e, tool radius r_toolBetween relation:

$h_{\max }=f_z\·\cos \mathrm{\θ}=f_z\·\frac{\sqrt{2r_{tool}\·a_e-a_e^2}-f_z}{\sqrt{{r_{tool}}^2-2f_z\sqrt{2r_{tool}\·a_e-a_e^2}+{f_z}^2}}---\left(1\right);$

103 utilize the cutting force peak F that dynamometer (1) gathers_max, draw the cutting force k of unit are_c, i.e. minuteness milling unit Cutting force computation model reaches formula:

$k_c=\frac{F_{\max }}{a_p\·h_{max}}=\frac{F_{max}\·\sqrt{{r_{tool}}^2-2f_z\sqrt{2r_{tool}\·a_e-a_e^2}+{f_z}^2}}{a_p\·f_z\·(\sqrt{2r_{tool}\·a_e-a_e^2}-f_z)}---\left(2\right)$

Wherein a_pRepresent the axial cutting depth in working angles；

2. keep axial cutting depth constant, regulation sliding support transverse slat (7) and then change radial cutting depth value, obtain difference Cutting parameter under Unit cutting force, obtain the relation between Unit cutting force and cutting data record:

Machining is grouped by 201, makes machining height equal to axial cutting depth a_p, the radial cutting degree of depth from 0 to 0.1mm is incremented by；

By dynamometer (1) real time record cutting force data in 202 working angles, for acquisition and the unit cutting of cutting force peak value The calculating of power；

3. data based on record, use the method for fuzzy logic to carry out cutting parameter optimization:

301 draw the change curve of Unit cutting force according to the data of record, and are determined the sudden change on curve by its derivative value Point, i.e. cutting occur after such a point, and the change of Unit cutting force sharply increases, and defining this cutting depth corresponding to point is pole Limit cutting depth；

The record data of 302 pairs of different groups all process according to step 301, obtain the limit under different cutting parameter combination Cutting depth；

The matching degree of set is represented by 303 by the data of record by a numerical value degree of membership between 0 and 1, and selects With triangle and trapezoidal membership function as the obfuscation instrument of parameter, complete the Fuzzy processing of input variable；

The logical calculated of 304 definition dependent blur rules, each fuzzy rule all uses " IF THEN " statement, and different is fuzzy Use " AND " statement to connect between rule, set up the fuzzy logic forecast model of minimum cutting depth；

305, using cutting speed and feed engagement as input variable, using minimum cutting depth as output variable, use region Center de-fuzzy method has carried out de-fuzzy operation to the output variable under semantic description state, and complete result of calculation removes mould Gelatinizing；

4. the reverse that predicts the outcome of the minimum cutting depth under combining according to different parameters goes out the radial cutting degree of depth of the limit, utilizes footpath To cutting depth formula:

Further optimization to radial direction cutting depth；A in formula_e' it is the radial cutting degree of depth optimized, r_toolTool diameter, h_m' give Determine the minimum cutting depth predictive value under cutting speed and feed engagement, f_zFeed of every rotation.

Radial cutting parameter optimization process the most according to claim 3, it is characterised in that: described step fuzzy logic The precision employing formula of model:

$A=\frac{1}{N}\underset{1}{\overset{N}{\Σ}}(1-\frac{|h_m^{\′}-{h_m}^{\′\′}|}{{h_m}^{\′\′}})\×100\%---\left(4\right)$

Calculate, wherein h_m" represent calculated minimum cutting depth value of calculation, h_m' represent and obtain based on fuzzy logic model Minimum cutting depth predictive value, N represents test number (TN).