CN106647634A - Cavity processing locus generation method integrated with ring-incision locus and variable-radius cycloidal locus - Google Patents
Cavity processing locus generation method integrated with ring-incision locus and variable-radius cycloidal locus Download PDFInfo
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- CN106647634A CN106647634A CN201610974215.2A CN201610974215A CN106647634A CN 106647634 A CN106647634 A CN 106647634A CN 201610974215 A CN201610974215 A CN 201610974215A CN 106647634 A CN106647634 A CN 106647634A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/4093—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by part programming, e.g. entry of geometrical information as taken from a technical drawing, combining this with machining and material information to obtain control information, named part programme, for the NC machine
- G05B19/40937—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by part programming, e.g. entry of geometrical information as taken from a technical drawing, combining this with machining and material information to obtain control information, named part programme, for the NC machine concerning programming of machining or material parameters, pocket machining
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/35—Nc in input of data, input till input file format
- G05B2219/35349—Display part, programmed locus and tool path, traject, dynamic locus
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Abstract
The invention provides a cavity processing locus generation method integrated with ring-incision locus and variable-radius cycloidal locus. The method comprises steps that firstly, in an outer-contour inward offset and inner-contour outward offset mode, the ring incision cutting locus of a cavity is constructed layer by layer; secondly, change of a material removal rate during ring-incision path processing is predicted, and a dangerous processing region of the cavity is automatically identified and divided; and lastly, the variable-radius cycloidal cutting locus is employed to fill the dangerous processing region to replace the ring-incision locus, and parameters including a cycloidal cutting feeding speed and radial cutting depth are adjusted to guarantee material removal rates realized through cycloidal cutting and ring-incision cutting to be generally consistent. The method is advantaged in that a problem of instantaneous overlarge cutter impact load caused by change of the material removal rate in a cavity processing process can be avoided, improvement of the processing feeding speed and cavity processing efficiency is facilitated, and service life of a cutter is prolonged.
Description
Technical field
The present invention relates to a kind of CAD/CAM technologies of machining, specially a kind of integrated ring cutting for pocket machining
Track and the pocket machining orbit generation method for becoming radius cycloidal path.
Background technology
As application of the high-speed milling in pocket machining is increasingly extensive, the problem that conventional ring cutting tool track is present is got over
Come more obvious.In the planning process of circular cutter rail, it is difficult to many concavo-convex turnings and narrow machining area can be generated with avoiding.
When processing these danger zones, the instantaneous mutation of material removing rate often occurs, so as to cause the mutation of cutter load, seriously
Affect cutter life and greatly limit the lifting of working (machining) efficiency.In order to preferably play what high-speed milling was processed to complex-shaped surface mould
Adaptability, while further improve cutter life, needing badly can either maintain metastable processing load, while and with compared with
The machining locus automatic generation method of high working (machining) efficiency.
Relevant research shows that cycloid milling mode can well solve the mutation problems of cutting load.Due to cycloid
Track is continuous, and tool contact angle and radial depth change are gentle and controllable in process, and will not be subject to processing region
The impact of alteration of form, can well keep stablizing for material removing rate, thus suitable for the high-speed milling of dangerous machining area
Processing.While lifting feed speed reduces process time, additionally it is possible to extend cutter life.
However, because cycloid tool track includes cut-in without ball section, relative to traditional ring cutting feed path, its machining path
Total length is longer.For the machining area beyond dangerous machining area, using traditional ring cutting feed material can be maintained to remove
Rate is stablized, thus using ring cutting tool track can obtain the working (machining) efficiency higher than cycloid tool track.
At present, existing computer-aided manufacturing software, such as Siemens NX, using a kind of cycloid feed of permanent radius
Path, for the processing of dangerous machining area.But, the cycloid tool track of permanent radius to the adaptability in complicated processing region not
By force, the cycloidal path for overlapping easily is formed, knife rail redundancy is caused, working (machining) efficiency is affected.
Become radius cycloid feed path, relative to the cycloid feed path of permanent radius, the geometry to institute's machining area
With better conforming to property, the cycloid Milling Process of complex region can be completed by one-pass, be led so as to avoid the occurrence of overlap
Rail；Furthermore, it is possible to pass through the step-length in each cycloid cycle of Automatic adjusument, stablizing for maximum radial cutting-in Rdc is maintained.Half will be become
Footpath cycloid feed path is reasonably integrated with traditional ring cutting feed path, can provide for the high-rate wireless LAN of complex-shaped surface mould
The processing method of higher efficiency.
The content of the invention
In order to solve above technical problem, the present invention proposes integrated ring cutting track and becomes the pocket machining of radius cycloidal path
Track automatic generation method.The method is processed for complex-shaped surface mould, automatically planning ring cutting feed path and change radius cycloid feed
Path, and stablizing for material removing rate in process can be kept, so as to provide more efficient for the High-speed machining of complex-shaped surface mould
The processing method of rate.
To reach object above, following technical scheme is present invention employs.
Integrated ring cutting track and the pocket machining orbit generation method for becoming radius cycloidal path, it is comprised the following steps:
Step 1：In CAM softwares read die cavity profile information, inwardly biased with die cavity outline, die cavity Internal periphery simultaneously
Outwardly biased mode, successively builds the ring cutting tool track of die cavity；
Step 2：Prediction adds the change of man-hour material removing rate, automatic identification simultaneously to mark off die cavity along the ring cutting tool track
Dangerous machining area；
Step 3：Using the dangerous machining area of radius cycloid tool track filling is become, ring cutting tool track is substituted；
Step 4：The parameters such as feed speed, the radial cutting depth of cycloid feed are adjusted, keeps cycloid feed to walk with ring cutting
Material removing rate is basically identical during knife.
Further, material removing rate is referred to described in step 2, instantaneous material of the cutter along machining locus on particular location
The volume of material is removed in material clearance MRR, the i.e. unit interval.
Further, dangerous machining area is referred to described in step 2, when cutter is along contour parallel milling track constant speed feed,
When there is substantially discernible change in its instantaneous material removing rate MRR, the swept die cavity region of cutter.
Further, radius cycloid tool track is become described in step 3 and there is following feature：
1) cycloid refer to the dynamic circle of prolate cycloid, i.e., along a boning out make nonslipping rolling when,
The track that dynamic circle outer is pinpointed；Dynamic circle is rolled one week, is a cycloid cycle, and the distance that the round heart is moved before and after rolling is step pitch,
The outer radius pinpointed to center of circle distance for cycloid of dynamic circle；
2) become the radius in radius cycloid knife each cycle of rail to change with the change of machining area width, be the machining area
Maximum inscribed circle radius RcDeduct tool radius Rt；
3) step pitch S for becoming each cycle of radius cycloid knife rail is variable, can pass through to adjust step pitch to remain processed
Maximum radial cutting depth Rdc's is constant in journey.
Further, during the dangerous machining area of radius cycloid tool track filling is become described in step 3, for each
Dangerous machining area is followed the steps below：
Step 3-1：Extract the axis of dangerous machining area；
Step 3-2：According to selected maximum radial cutting depth, along wherein one axis the change radius cycloid is generated
Tool track；
Step 3-3：Repeat step 3-2, until traversal completes all of axis line tracking of dangerous machining area.
Further, the axis of dangerous machining area refers to described in step 3-1, is made up of dangerous machining area profile
The set in all maximum inscribed circle centers of circle in plane closed domain area.
Compared with prior art, advantages of the present invention is with effect：By integrated change radius cycloid feed path and ring
Cut feed path, it is to avoid the problem of dangerous machining area material removing rate mutation, material in process in ring cutting tool track
Material clearance is stable and controllable, is particularly suitable for high-speed milling, can give full play to the advantage of High-speed machining, and can effectively improve knife
In the tool life-span, prevent cracking of cutter；Meanwhile, the shape of dangerous machining area can be well adapted to using radius cycloid is become, reduce
The problem of permanent radius cycloid knife rail redundancy.Generally speaking, the present invention can provide higher for the high-rate wireless LAN of complex-shaped surface mould
The processing method of efficiency.
Description of the drawings
Fig. 1 is the flow process of the integrated ring cutting track with the pocket machining orbit generation method for becoming radius cycloidal path of the present invention
Figure.
Fig. 2 is the schematic diagram of ring cutting tool track.
Fig. 3 is the geometrical analysis figure of hilted broadsword site material removing rate.
Fig. 4 is the geometrical analysis top view of hilted broadsword site material removing rate.
Fig. 5 is that certain part uses material removing rate variation diagram during ring cutting tool track.
Fig. 6 is the geometrical analysis figure for becoming radius cycloid knife rail hilted broadsword position.
Fig. 7 is that the schematic diagram for becoming radius cycloid knife rail is generated along axis.
Fig. 8 is using the schematic diagram for becoming the dangerous machining area of radius cycloid knife rail filling.
Fig. 9 is that certain part uses material removing rate variation diagram during tool track of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing and example to the present invention be embodied as be described further, but enforcement and the guarantor of the present invention
Shield not limited to this.
Fig. 1 is the flow process of the integrated ring cutting track with the pocket machining orbit generation method for becoming radius cycloidal path of the present invention
Figure.As illustrated, comprising the following steps：
(1) by the mode input CAM softwares of die cavity, choosing needs the region of processing, and arranges related processing parameters, wraps
Include, tool radius, feed speed, axial cutting-in, material removing rate etc..
According to given machined parameters, the offset or dish of suitable ring cutting tool track is calculated, machining area is used
Outline inwardly biases, while the outwardly biased method of Internal periphery successively builds ring cutting tool track, as shown in Fig. 2 to generate
Ring cutting tool track.
(2) in the planning process of ring cutting tool track, it is difficult to which the meeting for avoiding produces many turnings and narrow zone (as schemed
2), it is collectively referred to as dangerous machining area.The method of automatic identification danger machining area is as follows：
The material removing rate during feed is calculated first.As shown in Figure 3 and Figure 4, D is between two adjacent tool tracks
Line-spacing, H is axial cutting depth, VfFor feed speed, VfcFor the feed speed for cutting midpoint on cutter, RtFor cutter half
Footpath, α is the contact angle of tool circumferential and part, then the material removing rate MRR of ring cutting tool track can be estimated by below equation：
MRR=Rt·α·Vfc·H
Wherein VfcV can be usedfIt is approximate to replace simplifying calculating.
From the estimation equation of above-mentioned material clearance, typically can cut according to constant axial direction during pocket machining
Deep and feed speed is processed, and when man-hour is added along ring cutting tool track, MRR can be with tool circumferential and part contact angle
It is different and change.As shown in figure 5, when there is significantly mutation in material removing rate (for example：More than A lines more than 20%), can
Dangerous machining area is entered to define cutter.Also, for convenience subsequent treatment, is linked to be these scattered regions closed on
One or more regions, and distinguish narrow zone and corner region.
(3) subsequently, these dangerous machining areas are filled using change radius cycloid tool track.
(4) in order that become radius cycloid tool track keeps basically identical material removing rate with ring cutting tool track, can
To generate the cycloid tool track with constant maximum radial cutting depth Rdc by numerical computations, and by arranging cycloid
Feed speed V of feedf, with keep cycloid feed with during ring cutting feed material removing rate it is basically identical.
Becoming the generation method of radius cycloid tool track has following steps：
(1) profile information of dangerous machining area is extracted, the corresponding axis of the profile is generated；
(2) generate along wherein one axis and become radius cycloid tool track, by adjusting step pitch S constant maximum is obtained
Radial cutting depth Rdc, concrete grammar is as follows：
As shown in fig. 6, the Mathematical Modeling for becoming radius cycloid is represented by,
As shown in fig. 6, OcurFor the center in current cycloid cycle, OcFor a cutter location, OnextFor the next cycloid cycle
Center, S is the curve distance at the two cycloids cycle center for step pitch, and θ is the corresponding angle of the cutter location,For two
The cycloid cycle center Diff E and Diff N, RtrochoFor the radius of the cutter location, i.e. OcurWith OcDistance,
Rtrocho_curFor the maximum inscribed circle radius that center of current cycloid cycle is the center of circle, Rtrocho_nextFor center of next cycloid cycle
For the maximum inscribed circle radius in the center of circle.
As shown in fig. 7, being that the Mathematical Modeling for becoming radius cycloid according to more than is put along the change radius that one section of axis generates
Line tool track, the maximum radial cutting depth Rdc of different cycles is can be seen that in figure can be changed.
In order that the maximum radial cutting depth of each cycle remains setting value, step is as follows：
(1) according to the computing formula of maximum radial cutting depth, by iterative algorithm, calculate and meet maximum radial cutting
Step pitch S of depth, generates the cycloid of a cycle.Obtain the center in new cycloid cycle.
(2) repeat step (1) a, axis in the dangerous machining area of traversal, generates the change radius of whole piece axis
Cycloid tool track.
(3) repeat step (2), until traversal completes all of axis line tracking, obtain the pendulum of a dangerous machining area
Line tool track,
(4) repeat step (1) (2) (3), obtain dangerous machining area cycloid tool track, as shown in figure 8, turning
Covered by cycloid with narrow zone at angle.
Ring cutting tool track and cycloid tool track are integrated, the machining locus of die cavity are obtained, Fig. 8 show typical part
Machining locus figure.
Because all of dangerous machining area has all been extracted out in ring cutting tool track, and using change radius cycloid
The ring cutting tool track of the part is instead of, so during using tool track processing cavity of the present invention, being avoided that material removing rate
Mutation, stable material removing rate can be obtained in process, as shown in Figure 9.With stable material removing rate situation
Under, cutting force is also stable, not only adapts to higher feed speed, is particularly well-suited to high-speed milling, moreover it is possible to extend cutter
In the life-span, prevent cracking of cutter.Meanwhile, in the more stable region of ring cutting tool track material removing rate, it is not necessary to add and become radius
Cycloidal path, it is to avoid global all using the problem that the path length of cycloid tool track is long.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (6)
1. integrated ring cutting track with become radius cycloidal path pocket machining orbit generation method, it is characterised in that including following step
Suddenly:
Step 1：Die cavity profile information is read in CAM softwares, inwardly biased with die cavity outline, die cavity Internal periphery simultaneously outwards
The mode of biasing, successively builds the ring cutting tool track of die cavity；
Step 2：Prediction adds the change of man-hour material removing rate along the ring cutting tool track, and automatic identification simultaneously marks off the danger of die cavity
Dangerous machining area；
Step 3：Using the dangerous machining area of radius cycloid tool track filling is become, ring cutting tool track is substituted；
Step 4：The parameters such as feed speed, the radial cutting depth of cycloid feed are adjusted, when keeping cycloid feed and ring cutting feed
Material removing rate it is basically identical.
2. integrated ring cutting track according to claim 1 with become radius cycloidal path pocket machining orbit generation method,
It is characterized in that：Material removing rate is referred to described in step 2, and instantaneous material of the cutter along machining locus on particular location is removed
RateMRR, i.e., the volume of material is removed in the unit interval.
3. integrated ring cutting track according to claim 1 with become radius cycloidal path pocket machining orbit generation method,
It is characterized in that：Dangerous machining area refers to that, when cutter is along contour parallel milling track constant speed feed, its is instantaneous described in step 2
Material removing rateMRRWhen there is substantially discernible change, the swept die cavity region of cutter.
4. integrated ring cutting track according to claim 1 with become radius cycloidal path pocket machining orbit generation method,
It is characterized in that：Become radius cycloid tool track described in step 3 and there is following feature：
1) cycloid refer to the dynamic circle of prolate cycloid, i.e., along a boning out make nonslipping rolling when, move circle
The track of an outer fixed point；Dynamic circle is rolled one week, is a cycloid cycle, and the distance that the round heart is moved before and after rolling is step pitch, moves circle
Outer fixed point is to the radius that center of circle distance is cycloid；
2) become radius cycloid knife each cycle of rail radius change with the change of machining area width, be the machining area most
The radius of big inscribed circleR c Deduct tool radiusR t ；
3) step pitch in each cycle of radius cycloid knife rail is becomeSIt is variable, in passing through to adjust step pitch to maintain process
Maximum radial cutting depthRdcIt is constant.
5. integrated ring cutting track according to claim 1 with become radius cycloidal path pocket machining orbit generation method,
It is characterized in that：During becoming the dangerous machining area of radius cycloid tool track filling described in step 3, for each danger adds
Work area domain follows the steps below：
Step 3-1：Extract the axis of dangerous machining area;
Step 3-2：According to selected maximum radial cutting depth, along wherein one axis the change radius cycloid feed is generated
Track；
Step 3-3：Repeat step 3-2, until traversal completes all of axis line tracking of dangerous machining area.
6. a kind of integrated ring cutting track described in claim 5 with become radius cycloidal path pocket machining orbit generation method,
It is characterized in that：The axis of dangerous machining area refers to described in step 3-1, the plane envelope being made up of dangerous machining area profile
The set in all maximum inscribed circle centers of circle in closed domain area.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108241784A (en) * | 2018-01-08 | 2018-07-03 | 华南理工大学 | The cavity multicutter method for milling that a kind of cycloidal path is combined with ring cutting track |
| CN108415365A (en) * | 2018-01-31 | 2018-08-17 | 武汉大学 | A kind of cavity high-efficiency helical milling cutter paths planning method based on profile central axes |
| CN111251164A (en) * | 2020-01-10 | 2020-06-09 | 杭州开维科技有限公司 | Vacuum cup polishing method based on CAD modeling |
| CN111570878A (en) * | 2020-07-02 | 2020-08-25 | 无锡航亚科技股份有限公司 | High-speed rough milling method for impeller |
| CN111897286A (en) * | 2020-07-16 | 2020-11-06 | 武汉大学 | Cavity elliptic cycloid milling cutter path planning method based on contour central axis |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108241784A (en) * | 2018-01-08 | 2018-07-03 | 华南理工大学 | The cavity multicutter method for milling that a kind of cycloidal path is combined with ring cutting track |
| CN108415365A (en) * | 2018-01-31 | 2018-08-17 | 武汉大学 | A kind of cavity high-efficiency helical milling cutter paths planning method based on profile central axes |
| CN108415365B (en) * | 2018-01-31 | 2020-06-09 | 武汉大学 | Cavity efficient spiral milling cutter path planning method based on contour central axis |
| CN111251164A (en) * | 2020-01-10 | 2020-06-09 | 杭州开维科技有限公司 | Vacuum cup polishing method based on CAD modeling |
| CN111570878A (en) * | 2020-07-02 | 2020-08-25 | 无锡航亚科技股份有限公司 | High-speed rough milling method for impeller |
| CN111570878B (en) * | 2020-07-02 | 2021-08-31 | 无锡航亚科技股份有限公司 | High-speed rough milling method for impeller |
| CN111897286A (en) * | 2020-07-16 | 2020-11-06 | 武汉大学 | Cavity elliptic cycloid milling cutter path planning method based on contour central axis |
| CN111897286B (en) * | 2020-07-16 | 2021-06-04 | 武汉大学 | Cavity elliptic cycloid milling cutter path planning method based on contour central axis |
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