CN104375462B - Characteristic-based plate part in-groove tool path automatic-generation method - Google Patents
Characteristic-based plate part in-groove tool path automatic-generation method Download PDFInfo
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- CN104375462B CN104375462B CN201410610666.9A CN201410610666A CN104375462B CN 104375462 B CN104375462 B CN 104375462B CN 201410610666 A CN201410610666 A CN 201410610666A CN 104375462 B CN104375462 B CN 104375462B
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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
- G05B19/4097—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 using design data to control NC machines, e.g. CAD/CAM
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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
- G05B2219/45—Nc applications
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Abstract
A characteristic-based plate part in-groove tool path automatic-generation method is characterized by comprises the steps of firstly configuring a part machining environment, then layering all groove characteristics, obtaining intersecting lines through intersection of the each-layer bottom face and all side faces, extracting drive loops from the intersecting lines, determining the material side, and automatically establishing CAM operation and generating corresponding tool paths. By means of the characteristic-based plate part in-groove tool path automatic-generation method, operating geometric drives can be automatically extracted for a processor, and the material machining side can be judged, so that the processor does not need conduct repeated click, manual labor is remarkably reduced, and the efficiency of enterprises is improved.
Description
Technical field
The present invention relates to a kind of plate parts Computerized Numerical Control processing technology, the cavity feature knife rail of especially a kind of plate parts is automatic
Generation method, the plate parts groove type knife rail automatic generation method of specifically a kind of feature based.
Background technology
At present, CAM technology manufactures field in Aero-Space and has been widely used, and is processed track using CAM software
Establishment, can improve the programming efficiency of technique person to a certain extent, improve working (machining) efficiency, shorten the product manufacturing cycle, section
About production cost.But current business CAM software, such as UG, CATIA etc., when arranging process operation driving geometry, need
Manually to carry out substantial amounts of click, generally require to take a substantial amount of time, and easily malfunction, when part is larger more complicated
Wait, such problem is especially apparent.
Plate parts are used for aircraft structure and space structure part, with many cavity features and hole characteristic as feature, technique
Member, when working out such part, generally requires to work out tens of process operations, programing work amount is very big.And in establishment one
A bit in addition it is also necessary to technique person relies on experience to build some assisted geometrics when more complicated part position, which results in processing
The problems such as time is elongated, enterprise efficiency is relatively low.
Content of the invention
The purpose of the present invention is cannot to realize plate parts are operated for existing CAM software driving geometry to carry out automatically
Select, the problem that the programming efficiency causing is low, programming process is loaded down with trivial details, invention one kind can automatically extract operation drive geometry,
Automatically generate the groove type knife rail automatic generation method of operation knife rail.
The technical scheme is that：
A kind of plate parts groove type knife rail automatic generation method of feature based, is characterized in that comprising the following steps：
Step 1：Processing environment configures.Read part C AM model, and read feature identification the results list, feature identification is tied
Fruit list is the result of feature identification, have recorded the characteristic information that part is comprised.Then according to the feature identification result reading
List, by extracting the ident value in each face that feature list is recorded, then compares with part geometry model, extracts special
The processing geological information levied.
Step 2：Cavity feature inner mold is layered.Extract all sides of cavity feature first, after the completion of extraction, be stored in list container
ListSideFace.Extract all horizonal web plate faces that cavity feature comprises, the height value of all horizontal planes is entered using bubbling method
Row sorts from big to small, and deletes the height value of repetition, then all height values is stored in list container ListHeight.To groove
Feature is layered according to height, takes out two adjacent height values in ListHeight list successively, on two height values
Appoint respectively and take a horizontal plane, then high horizontal plane is the layer top surface of this layer, low horizontal plane is then the layer bottom surface of this layer.
Step 3：Obtain the initial intersecting lens of cavity feature inner mold.After cavity feature is layered, take out each layer of level
Layer bottom surface, this layer of bottom surface is upwardly biased to above the face of base angle, then carries out phase with all sides in this face and cavity feature
Hand over, after intersecting, a series of initial intersecting lens can be obtained.These initial intersecting lenses are stored in alignment ListLine.
Step 4：Driving ring classification is extracted.According to the initial alignment obtaining, extract driving ring therein, and according to whether envelope
Close and these driving rings obtaining are classified.Then time arbitrarily take out an intersecting lens first from alignment ListLine,
Go through remaining alignment, find out the line adjacent with this intersecting lens, and adjacent line is taken out, adjacent herein refer to two lines extremely
A rare end points is to overlap, and then proceedes to travel through, there is not the line adjacent with the line string taking out in remaining alignment
Till, the line string that takes out just constitutes a driving ring.Remaining alignment is appointed again and takes an intersecting lens, repeat above walking
Suddenly, until alignment is all taken out, till forming several driving rings.Build driving class Loop for each driving ring,
And corresponding for each driving ring line string is stored in Loop class.If line string head and the tail end points overlaps, this is driven style type setting
For closing, if line string head and the tail end points is misaligned, style type is driven to be set on putting this.
Step 5：Obtain and drive ring material side.According to all driving rings extracted, extract the processing material corresponding to driving ring
Material side.Take out first and the level all horizontal planes in layer bottom surface residing for this driving ring, by this these horizontal plane of driving ring
Projected, if certain horizontal plane successfully produces projection nucleus, this horizontal plane is this driving ring corresponding driving bottom surface.Obtain
The step of material side is as follows：
(1) if this driving ring is enclosed type driving ring, appoint the midpoint of a certain bar line taking in this ring, obtain the interior of this point
Normal direction and outer normal direction, interior normal direction was the vector that this point points to ring center, and the direction of outer normal direction is contrary with interior normal direction, respectively at this
Taking up an official post and take a point in direction pointed by two vectors, is designated as interior point and exterior point respectively, with this two points respectively to driving bottom surface
Projected, if the success of interior spot projection, material side is inside, if exterior point projects successfully, material side is outside.
(2) if this driving ring is opening driving ring, remember and point to the side of ring tail point from eye end points along driving ring
To the direction for this driving ring, appoint the midpoint of a certain bar line taking in this ring, remember that the tangent vector at this point is machine direction, obtain
This side residing for point, crosses this point and creates the normal vector in this face, and this normal direction is reverse.If to drive the normal vector of bottom surface
For axis, vector is to be obtained by machine direction rotate counterclockwise, then be designated as left-hand amount, in the same manner, vector is suitable by machine direction
Hour hands rotate and obtain, then be designated as dextrad amount.Appointing in both directions respectively takes a bit, is designated as left point and right point respectively, uses
Respectively to driving bottom surface to be projected, if the success of left spot projection, material side is left part to this two points, if the success of right spot projection,
Then material side is right part.
Step 6：Obtain process operation parameter information.After extraction driving ring and driving bottom surface and material side terminate, to every
The individual related processing parameters driving class Loop to obtain user setup, including the cutting mode of machining area, the speed of mainshaft, surplus letter
The information such as breath, cutter compensation position, the process of corner knife rail, are stored in corresponding driving apoplexy due to endogenous wind.
Step 7：Processing knife rail automatically generates.Class is driven to automatically generate a process operation, and the ginseng that will obtain each
Number information, geometric drive and material side information are arranged in corresponding operation, and system quickly calculates and generates process operation
Cutter path.
The invention has the beneficial effects as follows：
(1) program speed is fast, drives geometry all to be calculated by algorithm and generates, instead of and manually click, save and manually weigh
The time of multiple work, the workload of technique person is greatly reduced.
(2) automatization is high, whole groove type process operation generating process, except need to be manually entered necessary operating parameter it
Outward, all automatically generated by system, eliminate the time of manual programming, realize settling at one go.
Brief description
Fig. 1 is the flow chart of the present invention.
Fig. 2 is the feature identification result of certain space flight plate parts.
Fig. 3 is the inner mold layering result schematic diagram of certain part, and layer 1, layer 2, layer 3, layer 4 are 4 layers, and h1, h2 ... h5 is 5
Individual elevation of water value.
The schematic diagram that Fig. 4 extracts for inner mold driving ring.Loop1, Loop2 ... Loop12 is 12 drivings that this part extracts
Ring.
Fig. 5 judges schematic diagram for part material side, and left figure is that closing drives ring material side to judge, P0 point is in certain loop wire
Point, P1, P2 are respectively interior point and exterior point, and V1, V2 are respectively interior normal direction and outer normal direction, FbFor driving bottom surface, VFMethod for this bottom surface
Vector, right figure is that open driving ring material side judges, P0 is certain loop wire midpoint, and P1, P2 are left point and right point, and V1, V2 are left-hand
Amount and dextrad amount, V0 is machine direction, FbFor driving bottom surface, VFNormal vector for this bottom surface.
Fig. 6 is three layers of inner mold processing knife rail schematic diagram of part.
Specific embodiment
The present invention will be further described with example below in conjunction with the accompanying drawings.
As shown in figures 1 to 6.
A kind of plate parts groove type knife rail automatic generation method of feature based, flow chart as shown in figure 1, it include with
Lower step：
Step 1：Processing environment configures.Read part C AM model, and read feature identification the results list, feature identification is tied
Fruit list is the result of feature identification, have recorded the characteristic information that part is comprised.Then according to the feature identification result reading
List, by extracting the ident value in each face that feature list is recorded, then compares with part geometry model, extracts special
The processing geological information levied.
Step 2：Cavity feature inner mold is layered.Extract all sides of cavity feature first, after the completion of extraction, be stored in list container
ListSideFace.Extract all horizonal web plate faces that cavity feature comprises, the height value of all horizontal planes is entered using bubbling method
Row sorts from big to small, and deletes the height value of repetition, then all height values is stored in list container ListHeight.To groove
Feature is layered according to height, takes out two adjacent height values in ListHeight list successively, on two height values
Appoint respectively and take a horizontal plane, then high horizontal plane is the layer top surface of this layer, low horizontal plane is then the layer bottom surface of this layer.As
Fig. 3 is the sectional view of part shown in Fig. 2, and all horizontal planes of this part have h1, h2, h3, h4, h5 totally 5 height values, thus this zero
Part has been divided into totally 4 layers of layer 1, layer 2, layer 3, layer 4.
Step 3：Obtain the initial intersecting lens of cavity feature inner mold.After cavity feature is layered, take out each layer of level
Layer bottom surface, this layer of bottom surface is upwardly biased to above the face of base angle, then carries out phase with all sides in this face and cavity feature
Hand over, after intersecting, a series of initial intersecting lens can be obtained.These initial intersecting lenses are stored in alignment ListLine.
Step 4：Driving ring classification is extracted.According to the initial alignment obtaining, extract driving ring therein, and according to whether envelope
Close and these driving rings obtaining are classified.Then time arbitrarily take out an intersecting lens first from alignment ListLine,
Go through remaining alignment, find out the line adjacent with this intersecting lens, and adjacent line is taken out, adjacent herein refer to two lines extremely
A rare end points is to overlap, and then proceedes to travel through, there is not the line adjacent with the line string taking out in remaining alignment
Till, the line string that takes out just constitutes a driving ring.Remaining alignment is appointed again and takes an intersecting lens, repeat above walking
Suddenly, until alignment is all taken out, till forming several driving rings.Build driving class Loop for each driving ring,
And corresponding for each driving ring line string is stored in Loop class.If line string head and the tail end points overlaps, this is driven style type setting
For closing, if line string head and the tail end points is misaligned, style type is driven to be set on putting this.As shown in figure 4, this space flight plate class
The initial intersecting lens of part lowermost layer is extracted 12 driving rings, respectively Loop1, Loop2 ... Loop12 altogether, as shown in Figure 4.
Step 5：Obtain and drive ring material side.According to all driving rings extracted, extract the processing material corresponding to driving ring
Material side.Take out first and the level all horizontal planes in layer bottom surface residing for this driving ring, by this these horizontal plane of driving ring
Projected, if certain horizontal plane successfully produces projection nucleus, this horizontal plane is this driving ring corresponding driving bottom surface.Obtain
The step of material side is as follows：
(1) if this driving ring is enclosed type driving ring, appoint the midpoint of a certain bar line taking in this ring, obtain the interior of this point
Normal direction and outer normal direction, interior normal direction was this point the vector perpendicular to this point place side, sensing ring center, the direction of outer normal direction
Contrary with interior normal direction, taking up an official post and take a point in the direction pointed by respectively in this two vectors, is designated as interior point and exterior point respectively, uses this
Respectively to driving bottom surface to be projected, if the success of interior spot projection, material side is inside to two points, if exterior point projects successfully,
Material side is outside.As shown in Fig. 5 left side, P0 point is certain loop wire midpoint, and P1, P2 are respectively interior point and exterior point, and V1, V2 are respectively interior
Normal direction and outer normal direction, FbFor driving bottom surface, VFNormal vector for this bottom surface.
(2) if this driving ring is opening driving ring, remember and point to the side of ring tail point from eye end points along driving ring
To the direction for this driving ring, appoint the midpoint of a certain bar line taking in this ring, remember that the tangent vector at this point is machine direction, obtain
This side residing for point, crosses this point and creates the normal vector in this face, and this normal direction is reverse.If to drive the normal vector of bottom surface
For axis, vector is to be obtained by machine direction rotate counterclockwise, then be designated as left-hand amount, in the same manner, vector is suitable by machine direction
Hour hands rotate and obtain, then be designated as dextrad amount.Appointing in both directions respectively takes a bit, is designated as left point and right point respectively, uses
Respectively to driving bottom surface to be projected, if the success of left spot projection, material side is left part to this two points, if the success of right spot projection,
Then material side is right part.As shown in Fig. 5 right side, P0 is certain loop wire midpoint, and P1, P2 are left point and right point, and V1, V2 are that left vector sum is right
Vector, V0 is machine direction, FbFor driving bottom surface, VFNormal vector for this bottom surface.
Step 6：Obtain process operation parameter information.After extraction driving ring and driving bottom surface and material side terminate, to every
The individual related processing parameters driving class Loop to obtain user setup, including the cutting mode of machining area, the speed of mainshaft, surplus letter
The information such as breath, cutter compensation position, the process of corner knife rail, are stored in corresponding driving apoplexy due to endogenous wind.
Step 7：Processing knife rail automatically generates.Class is driven to automatically generate a process operation, and the ginseng that will obtain each
Number information, geometric drive and material side information are arranged in corresponding operation, and system quickly calculates and generates process operation
Cutter path.As shown in fig. 6, a, b, c are respectively three layers of inner mold machining sketch chart of this plate parts.
Part that the present invention does not relate to is same as the prior art or can be realized using prior art.
Claims (4)
1. a kind of plate parts groove type knife rail automatic generation method of feature based, is characterized in that being that it includes following step
Suddenly：
Step 1：Processing environment configures；Read part C AM model, and read feature identification the results list, feature identification result arranges
Table is the result of feature identification, have recorded the characteristic information that part is comprised；Then according to the feature identification the results list reading,
Extract the processing geological information of feature；
Step 2：Cavity feature inner mold is layered；It is ranked up according to all elevation of waters of cavity feature, and phase is carried out to cavity feature
The layering answered；
Step 3：Obtain the initial intersecting lens of cavity feature inner mold；After cavity feature is layered, take out each layer of level course bottom
Face, this layer of bottom surface is upwardly biased to above the face of base angle, is then intersected with all sides of cavity feature with this face, phase
A series of initial intersecting lens can be obtained after friendship；
Step 4：Driving ring classification is extracted；According to the initial alignment obtaining, extract driving ring therein, and come according to whether closing
These driving rings obtaining are classified；
Step 5：Obtain and drive ring material side；According to all driving rings extracted, extract the processing material corresponding to all driving rings
Material side；
Step 6：Obtain process operation parameter information；After extraction driving ring and driving bottom surface and material side terminate, to each drive
Rotating ring obtains the related processing parameters of user setup, including the cutting mode of machining area, speed of mainshaft T balance information, is stored in
Corresponding driving apoplexy due to endogenous wind；
Step 7：Processing knife rail automatically generates；Drive class to automatically generate a process operation each, and the processing obtaining is grasped
Make parameter information, drive ring material side information to arrange in corresponding operation, system-computed simultaneously generates the cutter rail of process operation
Mark.
2. method according to claim 1, is characterized in that described cavity feature inner mold stratification step is as follows：
（1）Extract all sides of cavity feature first, after the completion of extraction, be stored in list container ListSideFace；（2）Extraction tank
All horizonal web plate faces that feature comprises, the height value of all horizontal planes are sorted from big to small using bubbling method, and are deleted
Except the height value repeating, then all height values are stored in list container ListHeight；
（3）Cavity feature is layered according to height, takes out two adjacent height values in ListHeight list successively, two
Appoint respectively on individual height value and take a horizontal plane, then high horizontal plane is the layer top surface of this layer, low horizontal plane is then this layer
Layer bottom surface.
3. method according to claim 1, is characterized in that described driving ring classification extraction step is as follows：
（1）Arbitrarily take out an intersecting lens first from initial alignment, then travel through remaining alignment, find out and this intersecting lens
Adjacent line, and adjacent line is taken out, adjacent at least one end points of two lines that refers to is to overlap herein, then proceedes to
Traversal, till there is not the line adjacent with the line string taking out in the remaining alignment, the line string of that taking-up just constitutes a drive
Rotating ring；
（2）Remaining alignment is appointed again and takes an intersecting lens, repeat above step, until alignment is all taken out, formed
Till several driving rings；
（3）Build driving class Loop for each driving ring, and corresponding for each driving ring line string is stored in Loop class；If
Line string head and the tail end points overlaps, then drive style type to be set to close this, if line string head and the tail end points is misaligned, this drive
Rotating ring type is set to open.
4. method according to claim 3, is characterized in that described acquisition drives ring material side step suddenly as follows：
（1）Take out first and the level all horizontal planes in layer bottom surface residing for this driving ring, by this these level of driving ring
Face is projected, if certain horizontal plane successfully produces projection nucleus, this horizontal plane is this driving ring corresponding driving bottom surface；
（2）If this driving ring is enclosed type driving ring, appoints the midpoint of a certain bar line taking in this ring, obtain the interior normal direction of this point
With outer normal direction, interior normal direction be this point and perpendicular to this point place side, point to ring center vector, the direction of outer normal direction with interior
Normal direction is contrary, and taking up an official post and take a point in the direction pointed by respectively in this two vectors, is designated as interior point and exterior point respectively, with this two
Respectively to driving bottom surface to be projected, if the success of interior spot projection, material side is inside to point, if exterior point projects successfully, material
Side is outside；
（3）If this driving ring is opening driving ring, remember that the direction pointing to ring tail point along driving ring from eye end points is
The direction of this driving ring, appoints the midpoint of a certain bar line taking in this ring, remembers that the tangent vector at this point is machine direction, obtains this point
Residing side, crosses this point and creates the normal vector in this face, and this normal direction is reverse；If with the normal vector of driving bottom surface as axle
Line, vector is to be obtained by machine direction rotate counterclockwise, then be designated as left-hand amount, in the same manner, vector is clockwise by machine direction
Rotate and obtain, be then designated as dextrad amount；Appointing in both directions respectively takes a bit, is designated as left point and right point respectively, with this two
Respectively to driving bottom surface to be projected, if the success of left spot projection, material side is left part to individual point, if the success of right spot projection, material
Material side is right part.
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| CN102825315A (en) * | 2012-08-21 | 2012-12-19 | 南京航空航天大学 | In-groove type helical milling method |
| CN102922013A (en) * | 2012-10-25 | 2013-02-13 | 南京航空航天大学 | Cavity-characteristic-based high-efficiency rough machining method of aircraft structural part |
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| WO2012107594A1 (en) * | 2011-02-11 | 2012-08-16 | Ecole Polytechnique Federale De Lausanne (Epfl) | High speed pocket milling optimisation |
| CN102825315A (en) * | 2012-08-21 | 2012-12-19 | 南京航空航天大学 | In-groove type helical milling method |
| CN102922013A (en) * | 2012-10-25 | 2013-02-13 | 南京航空航天大学 | Cavity-characteristic-based high-efficiency rough machining method of aircraft structural part |
| CN103699055A (en) * | 2013-12-24 | 2014-04-02 | 沈阳飞机工业（集团）有限公司 | Intelligent numerical control machining programming system and intelligent numerical control machining programming method for aircraft structural parts |
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