CN106502201A - A kind of three-axis numerical control rough machining method of simple variable cross-section part - Google Patents
A kind of three-axis numerical control rough machining method of simple variable cross-section part Download PDFInfo
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- CN106502201A CN106502201A CN201611139533.3A CN201611139533A CN106502201A CN 106502201 A CN106502201 A CN 106502201A CN 201611139533 A CN201611139533 A CN 201611139533A CN 106502201 A CN106502201 A CN 106502201A
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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
- G05B19/19—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 positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
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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
Abstract
The invention discloses a kind of three-axis numerical control rough machining method of simple variable cross-section part, belongs to machining technology field.Methods described includes equidistantly processing part, one-level is discrete, two grades of discrete discrete points obtained on parts profiles, and generates each leafing scatterplot, ultimately produces contour parallel milling track.The present invention can efficiently solve the numerical control lathe processing problems of variable cross-section part according to requirement on machining accuracy flexible modulation machining locus.The present invention can be used for the axle deformation section parts three-axis numerical control roughing of the outer surface smoother transition being made up of multistage simple shape.
Description
Technical field
The invention belongs to machining technology field, and in particular to a kind of three-axis numerical control roughing of simple variable cross-section part
Method.
Background technology
Traditional two-axis numerical control lathe is only adapted to the processing of revolving parts, and the part section of processing can only be circular
Single shape.If desired the cross sectional shape part of processing not rounded can only be by other Digit Control Machine Tools so that the operation of part processing
Become complicated, reduce working (machining) efficiency and it cannot be guaranteed that crudy.The three-axis numerical control lathe for being furnished with C axles makes the uiform section shape of not rounded
Shape part is processed on lathe.When part is processed, using power knife rest, the indexing function of C axles is coordinated X-axis, Z axis
Linkage just can complete the processing of part.
The part of noncircular sectional shape is divided into uiform section part and variable cross-section part.Wherein, uiform section part refers to have
The part of similar cross sectional shape and cross section profile for arbitrary curve；Conversely, the part that cross sectional shape is unsatisfactory for similar quality is referred to as
For variable cross-section part.
Three-axis numerical control processing currently for uiform section part is C s functions using three-axis numerical control car, according to processing essence
Degree and cutting requirement, for uiform section part removes most of surplus, realize the roughing of part.Its main thought is to part
Similar cross sectional curve carry out equidistant partition.But the three-axis numerical control processing for variable cross-section part yet there are no relevant report.
Content of the invention
It is contemplated that proposing a kind of three-axis numerical control rough machining method for simple variable cross-section part, can be used for by multistage
The axle deformation section parts three-axis numerical control roughing of the outer surface smoother transition of simple shape composition.
The simple shape that the present invention is referred to refers to convex polygon in regular shape, circular or oval etc., and shaft parts
Line passes through above-mentioned shaped interior.
The center line for taking the minimum envelop cylinder of External Shape is axis of workpiece；Claim the intersection point of axis and each section of part
Discrete central point O for the section.Provided by the present invention for the three-axis numerical control rough machining method of simple variable cross-section part, including
Following steps：
The first step, makees equidistant process to the profile of part along exterior normal direction, and equidistant distance is roughing surplus offset
With tool radius r sums；
Second step, one-level are discrete：Discretization is carried out vertically to equidistant profile, by equidistant surface split plot design by equidistant profile
It is divided into the cross-section curve of series of discrete, dispersion degree is determined according to machining accuracy；
3rd step, two grades discrete：Generate processing cross section profile discrete point.
The discrete process of one-level causes the component of whole equidistant profile to there was only curve, that is, the section of a rule is bent
Line.Every cross section curve is handled as follows：The discrete central point O crossed on the section makees equal angular ray cluster, the ray cluster
In every ray and the cross section curve have an intersection point, the roughing precision that angular dimension can be as requested is suitably adjusted；Institute
Represent after having cross section curve process to terminate that two grades of discretizations are completed；So far, the component of equidistant profile only have a series of from
Scatterplot.
4th step, generates the discrete point of each layer：According to floor height value h that user gives, to parts profile as distance it is
The equidistant process of offset+r+h, per layer of equidistant distance increment are h, and the step of repeat second step～three step, until etc.
Discrete point on section of outline is more than or equal to blank radius to the minimum of a value at discrete center；
5th step, generates contour parallel milling track.
According to safe altitude, determine the feed point of cutter, and the rollback according to per layer during cutting highly determines moving back for cutter
Knife point.According to machine direction, travel through the discrete point in section, the section adjacent discrete point is connected with straight line, then adjacent on section
The straight line of discrete point is the cutter path for processing the section, travels through each section when all of section just can obtain processing this layer
The cutter path in face.Remaining each layer makees same treatment.
The roughing circular cutter track of variable cross-section part has so just been obtained.
Advantages of the present invention or beneficial effect are：
The present invention can efficiently solve the numerical control of variable cross-section part according to requirement on machining accuracy flexible modulation machining locus
Vehicle Processing problem.
Description of the drawings
Fig. 1 is to carry out departure process schematic diagram in the present invention.
Fig. 2 is the three-axis numerical control rough machining method flow chart provided by the present invention for simple variable cross-section part.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
The present invention provides a kind of three-axis numerical control rough machining method for simple variable cross-section part, flow process as shown in Figure 2, tool
Body comprises the steps：
The first step, initialization.
Given initial equidistant apart from dis=offset+r, wherein offset is roughing surplus, and r is tool radius；
The center line for taking the minimum envelop cylinder of External Shape is axis of workpiece；Claim the intersection point of axis and each section of part
Discrete central point O for the section.
Second step, parts profile are equidistantly processed.
It is that equidistant distance makees equidistant process to the profile of part along exterior normal direction with dis；
If the parametric equation of parts profile is(u, v are parameter, and x, y, z are with regard to u, the letter of v
Number), unit normal vector of the curve at (x, y, z) place isThe then parametric equation of equidistant profile：
Wherein
3rd step, one-level are discrete；
Discretization is carried out vertically to equidistant profile using equidistant surface split plot design, equidistantly will be divided into series of discrete by profile
Cross-section curve, specific as follows：
First in the range of part length, it is dividing for d to enter line space to the center line of the equidistant profiled envelope cylinder of part
Cut, obtain a series of discrete central point O that spacing are d；The plane of each discrete central point O work and central axis is crossed respectively, per
Individual plane has a unique intersection with the equidistant profile of part, and the cross section that all of intersection constitutes series of discrete is bent
Line；Wherein, discrete spacing d according to machining accuracy determine, if discrete go out cross section curve number be n；
4th step, two grades discrete；
Generate processing cross section profile discrete point.One-level discrete processes in second step cause the composition unit of whole equidistant profile
Element only has curve, that is, the cross section curve of a rule.To every cross section curve SjIt is handled as follows：Cross the section discrete in
Heart point O makees the ray cluster of angularly β, and every ray in the ray cluster has an intersection point with the cross section curve, in Fig. 1
PiIf total number of hits is num=2 π/β, discrete angular β sizes are determined by the roughing precision of specific requirement；All sections are bent
Line process represents that two grades of discretizations are completed after terminating；So far, the component of equidistant profile only has a series of discrete point.
5th step, discrete termination condition judge；
Each section is traveled through, cross section curve S is calculatedjOn discrete point PiTo central point O apart from Disij, take its minimum of a value
min：
If min >=rStock(rStockFor blank radius), departure process terminates, and proceeds to the 6th step；
Floor height value h for otherwise being given according to user, makees equidistant process, makes equidistantly apart from dis=dis+h to parts profile,
Proceed the 3rd step～the 4th step.
6th step, generates contour parallel milling track.
According to safe altitude, determine the feed point of cutter, and the rollback according to per layer during cutting highly determines moving back for cutter
Knife point.According to machine direction, travel through the discrete point in section, the section adjacent discrete point is connected with straight line, then adjacent on section
The straight line of discrete point is the cutter path for processing the section, travels through each section when all of section just can obtain processing this layer
The cutter path in face.Remaining each layer makees same treatment.
Claims (4)
1. a kind of three-axis numerical control rough machining method of simple variable cross-section part, it is characterised in that：Thick to determine as follows
Processing circular cutter track：
The first step, makees equidistant process to the profile of part along exterior normal direction；
Second step, one-level are discrete：Discretization is carried out vertically to equidistant profile, equidistant profile is divided into by equidistant surface split plot design
The cross-section curve of series of discrete, dispersion degree are determined according to machining accuracy；
3rd step, two grades discrete：Generate processing cross section profile discrete point；
4th step, generates the discrete point of each layer：According to floor height value h that user gives, it is offset+r+ to make distance to parts profile
The equidistant process of h, per layer of equidistant distance increment are h, and the step of repeat second step～three step, until equidistant section of outline
On discrete point to discrete center minimum of a value be more than or equal to blank radius；
5th step, generates contour parallel milling track；
According to safe altitude, the feed point of cutter is determined, and highly determine the withdrawing point of cutter according to per layer during cutting of rollback；
According to machine direction, the discrete point in section is traveled through, the section adjacent discrete point is connected with straight line, then adjacent discrete point on section
Straight line be and process the cutter path in the section, travel through the cutter rail in each section when all of section just obtains processing this layer
Mark；Remaining each layer makees same treatment.
2. the three-axis numerical control rough machining method of a kind of simple variable cross-section part according to claim 1, it is characterised in that：The
Equidistant distance described in one step is roughing surplus offset and tool radius r sums.
3. the three-axis numerical control rough machining method of a kind of simple variable cross-section part according to claim 1, it is characterised in that：The
One-level described in two steps is discrete specially：
First in the range of part length, enter the segmentation that line space is d to the center line of the equidistant profiled envelope cylinder of part, obtain
To a series of discrete central point O that spacing are d；The plane of each discrete central point O work and central axis, each plane are crossed respectively
There are a unique intersection, all of intersection to constitute the cross-section curve of series of discrete with the equidistant profile of part；Wherein,
Discrete spacing d is determined according to machining accuracy.
4. the three-axis numerical control rough machining method of a kind of simple variable cross-section part according to claim 1, it is characterised in that：The
Two grades described in three steps are discrete to be specially：
The discrete central point O crossed on the section makees equal angular ray cluster, every ray in the ray cluster and the cross section curve
There are an intersection point, all of intersection point to constitute the discrete point of the cross section profile；All cross section curve process terminate after represent two grades from
Dispersion is completed；So far, the component of equidistant profile only has a series of discrete point；
The center line for taking the minimum envelop cylinder of External Shape is axis of workpiece, and axis is this section with the intersection point in each section of part
The discrete central point O in face.
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Cited By (3)
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| CN108646667A (en) * | 2018-03-05 | 2018-10-12 | 北京华航唯实机器人科技股份有限公司 | Orbit generation method and device, terminal |
| CN109093132A (en) * | 2018-11-01 | 2018-12-28 | 重庆江增船舶重工有限公司 | A kind of cast housing molded line method for turning |
| CN109214377A (en) * | 2018-07-27 | 2019-01-15 | 深圳市闿思科技有限公司 | Sequence number recognition methods, system, mobile terminal and storage medium |
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| CN109093132A (en) * | 2018-11-01 | 2018-12-28 | 重庆江增船舶重工有限公司 | A kind of cast housing molded line method for turning |
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