CN108319229A - A kind of small straightway feed speed control method of digital control processing - Google Patents
A kind of small straightway feed speed control method of digital control processing Download PDFInfo
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- CN108319229A CN108319229A CN201810222937.1A CN201810222937A CN108319229A CN 108319229 A CN108319229 A CN 108319229A CN 201810222937 A CN201810222937 A CN 201810222937A CN 108319229 A CN108319229 A CN 108319229A
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- straightway
- feed speed
- interpolation
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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
- G05B19/416—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 control of velocity, acceleration or deceleration
- G05B19/4163—Adaptive control of feed or cutting velocity
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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
- G05B2219/36—Nc in input of data, input key till input tape
- G05B2219/36521—Select by combination of detected force, acceleration, speed, work rate
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
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- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Numerical Control (AREA)
Abstract
The present invention discloses a kind of small straightway feed speed control method of digital control processing, to the interpolation distance less than digital control system minimum interpolation cycle, and carries out feed speed constraint there are the small straightway of larger direction cosines variable angle and plans again.The present invention can carry out feeding speed optimization in postpositive disposal process with regard to combining with digital control system interpolation parameters, reduce that feeding that numerical control post processing program is brought on practical lathe by the frequent velocity variations of small straightway is sluggish or part processing quality defect that the reasons such as motion process reference axis hypervelocity are brought.
Description
Technical field
The present invention relates to numerical control processing technologies, are based particularly on the small straightway feed speed controlling party of postpositive disposal process
Method.
Background technology
For numerically-controlled machine tool and system, the flatness of feed speed is that another key in addition to tracking accuracy is asked
Topic, this is because it is played an important role in terms of improving processing curve quality.In processing by a large amount of short and small straightway (G01
Code) composition space curved surface when, often will appear the fluctuation of feed speed.This can be such that the load of cutting tool fluctuates,
Increase process time and suface processing quality is caused to reduce.The main reason is that computer-aided manufacturing (CAM) software algorithm band
The inhomogeneities of the length of straigh line come.Traditional numerically-controlled machine tool and system controller is used based on two level interpolation and fixed interpolation
The time-divided method in period is sad.Carry out interpolation straightway.It is not equal to the integral multiple of desired feed speed in given length of straigh line
When, just will appear fraction distance problem, to which the required number of cycles of the interpolation straight line just needs rounding, rounding can bring into
To velocity perturbation and reduce processing quality.For the NC program in machine codes comprising the non-uniform straightway of many length, it can lead
Frequent feed speed is caused to fluctuate.
In addition, due to the limitation of calculating speed in CNC, interpolation cycle T has to be larger than equal to numerically-controlled machine tool and decorum completion
Minimum period needed for interpolation.When there is this lower limit situation, feed speed fluctuation can only passively be reduced to one
Lower level.
Invention content
A kind of control of present invention offer is smooth, the rational short and small straightway feed speed control method of planning.
The present invention proposes a kind of small straightway feed speed control method of digital control processing, includes the following steps:
Step 1:It obtains or setting waits for the numerically-controlled machine tool of postpositive disposal and the interpolation cycle of systemTcWith seamed edge critical angle allowable
Degreeδ；
Step 2:According to the expection feed speed in numerical control programFAnd interpolation cycleTcIt is calculated in lathe interpolation cycle
Maximum interpolation distanceΔS=F×Tc；
Step 3:The direction cosines angle theta of the length of straigh line L and adjacent straightway that are obtained according to numerical control program are judged：
Ifθ≤δOrL≥ΔSIt is not required to carry out speed control optimization, ifθ > δAndL <Δ S,Then confirm that the straightway is
The small straightway that need to carry out speed control, enters step 4；
Step 4:According to maximum interpolation distanceΔSWith small length of straigh lineL, the segment length, which is calculated, isLSmall straightway institute
The interpolation number neededN=Ceiling(L÷ΔS),（Ceiling is the function that rounds up）, then it is calculated after recalculating
Feed speedFo=L÷(N×Tc)。
The present invention has following good effect compared to conventional art：
The present invention innovatively proposes a kind of small straightway feed speed control method based on postpositive disposal, can reduce numerical control machine
The abnormal phenomenon such as the sluggish, hypervelocity of speed that bed generates in small straightway process, can effectively promote small straightway program and add
Quality in work and operational efficiency.
The method of the invention can carry out speed planning in advance in postpositive disposal process, reduce numerically-controlled machine tool and system exists
The speed planning difficulty in computation of numerical control program implementation procedure so that the numerical control program feed speed after this method optimizes and lathe
Actual motion speed is closer, can more reflect the actual processing state of numerical control program.
The present invention can be to the interpolation distance less than digital control system minimum interpolation cycle, and there are the changes of larger direction cosines angle
The small straightway changed carries out feed speed constraint and plans again；It can be in postpositive disposal process with regard to combining with digital control system interpolation parameters
Feeding speed optimization is carried out, reduces frequent velocity variations of the numerical control post processing program because of small straightway on practical lathe and brings
The part processing quality defect that feeding is sluggish or the reasons such as motion process reference axis hypervelocity are brought.
Description of the drawings
Attached drawing 1 is adjacent straightway schematic diagram in numerical control program.
Attached drawing 2 is the feed speed schematic diagram optimized using the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings 1 and attached drawing 2 further illustrated the present invention with certain type numerically-controlled machine tool postpositive disposal example, but not
Therefore it limits the present invention among the embodiment described range.
Step 1:It obtains to insert or be arranged and mends the periodTcWith seamed edge critical angle allowableδ
Tc=0.002 second=0.002*（1/60）Minute=0.000033 minute,
System seamed edge critical angle allowableδIt is set as36°
Step 2:Calculate the maximum interpolation distance in the lathe interpolation cycleΔS=F×Tc。
Feed speed F in program is 8000 mm/mins, it can thus be concluded that：
Δ S=F × Tc=8000*0.000033333=0.266667 millimeter
Step 3:Calculate separately adjacent length of straigh lineL and itsDirection cosines angleθ, and judge whether it is small straightway.
The distribution schematic diagram of adjacent straightway is shown in that Fig. 1, the length and direction cosines angle of adjacent two straightway are respectively：
L1=0.213 <1=45 ° of Δ S, θ< δ
L2=0.154 <2=48 ° of Δ S, θ< δ
Thus it can determine whether, two straightways are small straightway, need to carry out feed speed and plan again.
Step 4:Calculate interpolation numberThe N and Fo after optimization。
N1=Ceiling(L÷ΔS)= Ceiling(0.79874)=1
N2=Ceiling(L÷ΔS)= Ceiling(0.95249)=1
Then the feed speed after two small straightway optimizations is respectively：
Fo1=L1 ÷ (N1 × Tc)=0.213 ÷ (1 × 0.000033333)=6390 mm/min
Fo2=L2 ÷ (N2 × Tc)=0.154 ÷ (1 × 0.000033333)=4620 mm/min
As shown in Figure 2.
Claims (1)
1. a kind of small straightway feed speed control method of digital control processing, includes the following steps:
Step 1:It obtains or setting waits for the numerically-controlled machine tool of postpositive disposal and the interpolation cycle of systemTcWith seamed edge critical angle allowable
Degreeδ；
Step 2:According to the expection feed speed in numerical control programFAnd interpolation cycleTcIt is calculated in lathe interpolation cycle
Maximum interpolation distanceΔS=F×Tc；
Step 3:The length of straigh line obtained according to numerical control programLWith the direction cosines angle of adjacent straightwayθ is judged：
Ifθ≤δOrL≥ΔSIt is not required to carry out speed control optimization；Ifθ > δAndL <Δ S,Then confirm that the straightway is
The small straightway that need to carry out speed control, enters step 4；
Step 4:According to maximum interpolation distanceΔSWith small length of straigh lineL, the segment length, which is calculated, isLSmall straightway institute
The interpolation number neededN=Ceiling(L÷ΔS), then feed speed Fo controlled by Fo=L ÷ (N × Tc), wherein：
Ceiling is the function that rounds up.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810222937.1A CN108319229B (en) | 2018-04-17 | 2018-04-17 | Small straight line segment feeding speed control method for numerical control machining |
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|---|---|---|---|
| CN201810222937.1A CN108319229B (en) | 2018-04-17 | 2018-04-17 | Small straight line segment feeding speed control method for numerical control machining |
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| CN108319229A true CN108319229A (en) | 2018-07-24 |
| CN108319229B CN108319229B (en) | 2020-11-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327756A (en) * | 2020-11-19 | 2021-02-05 | 杭州爱科科技股份有限公司 | Flexible material track data processing method, device, equipment and storage medium |
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| JPH1069307A (en) * | 1996-08-28 | 1998-03-10 | Roland D G Kk | Offset processing method in three-dimensional working |
| CN101169647A (en) * | 2006-10-27 | 2008-04-30 | 上海电气集团股份有限公司中央研究院 | Mini line segment curve five-axis linkage machining speed smoothing method |
| CN101510087A (en) * | 2009-01-21 | 2009-08-19 | 西安交通大学 | Forward looking self-adapting speed controlling method for high-speed processing tiny line segment |
| CN101539769A (en) * | 2009-04-28 | 2009-09-23 | 中国科学院数学与系统科学研究院 | Method for fitting and interpolating G01 code based on quadratic B spline curve |
| JP2012022388A (en) * | 2010-07-12 | 2012-02-02 | Fanuc Ltd | Numerical controller for machine tool with function of controlling speed of arc operation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327756A (en) * | 2020-11-19 | 2021-02-05 | 杭州爱科科技股份有限公司 | Flexible material track data processing method, device, equipment and storage medium |
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