CN103116315A - Control method for achieving cutting tool radius compensation overall interference in numerical control system - Google Patents
Control method for achieving cutting tool radius compensation overall interference in numerical control system Download PDFInfo
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Abstract
The invention relates to a control method for achieving cutting tool radius compensation overall interference in a numerical control system and belongs to the technical field of data system control methods. The method comprises the steps of arranging end points of line segments formed by original workpiece paths and cutting tool outer side paths in sequence, and storing the end points into event queues in sequence; judging whether event points exist in the event queues or not, if so, utilizing a scanning line to order the event points and updating state queues; and reporting that overall interference exists if intersection points of line segments in the state queues are intersection points of the line segments formed by the original workpiece paths and the cutting tool outer side paths. The method perform quick overall interference judgment based on the scanning line, operation tine is only related to the number of the intersection points of the line segments, judging speed is high, and accuracy is high. In addition, over cutting possibility can be warned in real time, the control method is suitable for complicated workpiece processing, and is simple and convenient in achieving mode and low in achieving cost.
Description
Technical field
The present invention relates to the Computerized Numerical Control technology field, particularly utilize method for controlling cutting tools technical field in the processing technology of digital control system, specifically refer to realize in a kind of digital control system the control method of cutter radius compensation global interference.
Background technology
In digital control system, often need to carry out cutter radius compensation to workpiece to be processed, there is the skew of a tool radius in the actual motion path of cutter with respect to the program path of workpiece.In the G code instruction that digital control system is commonly used, G41 and G42 indicate respectively the left cutter of setting up cutter to mend and right cutter is mended.Cutter radius compensation is significant for accurate processing work: client's cutter has some wearing and tearing after having processed some instruments, utilize radius compensation, and can also utilize original workpiece path is that worn out cutter generates suitable machining path.
Cutter compensation control method of the prior art, after the path of cutter radius compensation generated, the zone of the cutter operating path process after compensation can not be intersected with original workpiece path, if there is crossing appearance will cut bad workpiece, this is called interference, and the danger of cutting bad workpiece is arranged.For the detection that the cutter benefit is interfered, most of digital control system all only has local the interference to detect, and can utilize cutter benefit rear path direction vector and workpiece path direction vector to compare to have determined whether local the interference in process.
Yet actual processed file may produce the situation of global interference.This situation can't detect with detecting local method of interfering.In case this interference occurs, if do not have timely discovery will cut bad workpiece.
As shown in Figure 1, if the path of pressing this moment after cutter is mended processes, will cut workpiece bad.In ellipse, cutter has cut away corner angle of workpiece.Interference for this type of can't be calculated in real time because following any line segment all may with current red line segment intersection.So detecting global interference can only carry out by off-line.
The workpiece of reality processing can be complicated more a lot of than shown in Figure 1, and line segment quantity is many, if there is workpiece path the hundreds of thousands bar is arranged, the line segment of up to a million, adopting so general method off-line to detect global interference speed can be very slow.Huge data volume may make the program detection speed extremely slow, can't be applied in actual software product.Therefore, how to realize fast and effeciently detecting global interference, warn in advance the user may produce the situation of cutting with current workpiece processing tool, become problem demanding prompt solution in the art.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, provide a kind of and carry out global interference judgement fast based on sweep trace, its working time is only relevant to intersection point of line segments quantity, judgement speed is fast, accuracy rate is high, can the real-time alerting user may produce the situation of cutting with current workpiece processing tool, is applicable to complicated workpiece processing, and implementation is easy, realizes realizing in digital control system with low cost the control method of cutter radius compensation global interference.
In order to realize above-mentioned purpose, realize in digital control system of the present invention that the control method of cutter radius compensation global interference comprises the following steps:
(1) digital control system generates the outer side path of cutter according to original workpiece path;
(2) digital control system is arranged the end points of the composition line segment of described original workpiece path and the outer side path of cutter by order from left to right, and described end points is deposited in event queue according to top-down order;
Whether (3) digital control system judges case point in described event queue, if do not have, method ends, if having, enter step (4);
(4) digital control system init state formation; All line segments that described state queue intersects in order to store current and sweep trace, and specified order storage;
(5) digital control system utilizes sweep trace from left to right to scan case point in described event queue, and upgrades described state queue according to scanning mode;
(6) digital control system judges whether the line segment in described state queue produces intersection point, and no is to enter step (7), if not, returns to step (5);
(7) digital control system is inserted intersection point in described event queue, and judge whether the line segment that consists of intersection point is respectively the composition line segment of original workpiece path and the composition line segment of the outer side path of cutter, if enter step (8), if not, return to step (5);
(8) there is global interference in the digital control system report.
Realize in this digital control system in the control method of cutter radius compensation global interference, described case point is the intersection point of the composition line segment of described original workpiece path or the outer side path of cutter.
Realize in this digital control system in the control method of cutter radius compensation global interference, described digital control system is upgraded described state queue according to scanning mode, is specially: described digital control system enters described state queue with the line segment sequential update after described case point.
Realize in this digital control system in the control method of cutter radius compensation global interference, described digital control system judges that whether the line segment in described state queue produces intersection point, specifically comprises the following steps:
(61) described digital control system judges whether the line segment order of upgrading in described state queue has new adjacent segments;
(62) described digital control system judges whether described new adjacent segments can produce intersection point.
Realize in this digital control system in the control method of cutter radius compensation global interference, described state queue is the state queue of balanced binary tree construction
Adopted the control method that realizes the cutter radius compensation global interference in the digital control system of this invention, it is first arranged the end points of the composition line segment of side path outside original workpiece path and cutter by order from left to right, and end points is deposited in event queue according to top-down order; Whether case point is arranged in then decision event formation, if do not have, do not have global interference, if having, utilize sweep trace from left to right to scan case point in described event queue, and according to the formation of scanning mode update mode; Judge then whether the line segment in state queue produces intersection point, no is to judge further whether the line segment that consists of intersection point is respectively the composition line segment of original workpiece path and the composition line segment of the outer side path of cutter, if there is global interference in report.The method is carried out global interference judgement fast based on sweep trace, its working time is only relevant to intersection point of line segments quantity, thereby can guarantee that judgement speed is fast, accuracy rate is high, and can the real-time alerting user may produce the situation of cutting with current workpiece processing tool, be applicable to complicated workpiece processing, and realize the control method of cutter radius compensation global interference in digital control system of the present invention, its implementation is easy, realizes with low cost.
Description of drawings
Fig. 1 is the machining path schematic diagram that utilizes the Tool Compensation generation global interference of prior art.
Fig. 2 realizes the schematic flow sheet of the control method of cutter radius compensation global interference in digital control system of the present invention.
Fig. 3 realizes utilizing in the control method of cutter radius compensation global interference sweep trace to carry out the schematic diagram of global interference judgement fast in digital control system of the present invention.
Embodiment
In order more clearly to understand technology contents of the present invention, describe in detail especially exemplified by following examples.
See also shown in Figure 2, for realizing the schematic flow sheet of the control method of cutter radius compensation global interference in digital control system of the present invention.
In one embodiment, the method comprises the following steps:
(1) digital control system generates the outer side path of cutter according to original workpiece path;
(2) digital control system is arranged the end points of the composition line segment of described original workpiece path and the outer side path of cutter by order from left to right, and described end points is deposited in event queue according to top-down order;
Whether (3) digital control system judges case point in described event queue, if do not have, method ends, if having, enter step (4), and wherein, described case point is the intersection point of the composition line segment of described original workpiece path or the outer side path of cutter;
(4) digital control system init state formation; All line segments that described state queue intersects in order to store current and sweep trace, and specified order storage;
(5) digital control system utilizes sweep trace from left to right to scan case point in described event queue, and upgrades described state queue according to scanning mode;
(6) digital control system judges whether the line segment in described state queue produces intersection point, and no is to enter step (7), if not, returns to step (5);
(7) digital control system is inserted intersection point in described event queue, and judge whether the line segment that consists of intersection point is respectively the composition line segment of original workpiece path and the composition line segment of the outer side path of cutter, if enter step (8), if not, return to step (5);
(8) there is global interference in the digital control system report.
In embodiment more preferably, in described step (5), digital control system is upgraded described state queue according to scanning mode, is specially: described digital control system enters described state queue with the line segment sequential update after described case point.The described digital control system of its step (6) judges that whether the line segment in described state queue produces intersection point, specifically comprises the following steps:
(61) described digital control system judges whether the line segment order of upgrading in described state queue has new adjacent segments;
(62) described digital control system judges whether described new adjacent segments can produce intersection point.
In preferred embodiment, described state queue is the state queue of balanced binary tree construction.
In the digital control system process of reality, after compensation, the opposite side of cutter has formed a line segment parallel with original workpiece path, if there is no global interference, this path should intersection point can not occur with the machining path of original workpiece.
So in practical application of the present invention, the first step, utilize traditional method to generate the outer side path of cutter, the outer side path of this cutter is not the center cutter point running orbit after cutter compensation, but the path of the cutter other end corresponding with workpiece path, just in time tool diameter apart from workpiece path, the path that namely in Fig. 1, the solid line line segment forms.The path of two types after generation is all the set of line segment in fact.
Suppose to have a sweep trace to scan the right from the left side of figure.When global interference occurring somewhere, sweep trace can be warned the user with result when scanning this.Once from left to right scanning just can be with the output of all interference points.
The end points of the outer side path of all workpiece paths and cutter is all stored in a formation, and with these points according to from left to right, order sequence from top to bottom.These nodes are stored with balanced binary tree, insert the new node of new node and deletion all quite rapid at every turn.Represent this binary tree with Q, in fact Q is exactly a case point formation, along with sweep trace from left to right scans the intersection point that detection may occur, if there is new intersection point to occur, this intersection point is added Q.Define in addition a balanced binary tree L, L has recorded the sweep trace state, i.e. the line segment aggregate that intersects of all and current scan line.Certainly, some line segment comes from workpiece path, and some line segment comes from the outer side path of cutter.Line segment in L according to the intersection point of sweep trace, arrange from small to large, sweep trace limit scanning from left to right runs into case point and just processes the event that present node occurs.Each case point can upgrade the record in L, and issuable new intersection point of line segments is inserted in Q.
As shown in Figure 3, at case point (2,4 intersection point), green sweep trace and 1,2,3,4,5,6 intersects, so, before sweep trace was processed this case point, the line segment in L was sequentially (5,4,3,2,1), after processing through case point, make line segment in L sequentially for (5,6,2,4,1), produced so new 1,4 adjacent and 5,6 adjacent.Due to the generation of new adjacent segments, can judge whether new adjacent line segment has intersection point, if there is new intersection point to produce (5,6 producing new intersection point here), new intersection point is inserted in case point formation Q.
During a certain case point P of concrete processing, L there is following operation:
1, all line segment aggregate A of intersecting of definition and P point, find out the line segment above A, if exist, represents with u, finds out the line segment below A, if exist, represents with d.
2, the line segment that in deletion L, all right endpoints are ordered at P.
3, the line segment that intersects with the P point in deletion L.
4, the line segment that intersects of insertion and P point in L, inserts the line segment that all left end points are ordered at P.
Why will carry out step 3,4 operation, be in order correctly to upgrade L middle conductor order, to find the top line segment nu of new insertion line segment; Find bottom line segment nd(nu and the nd of new insertion line segment only having a line segment to insert the same line segment of interval scale).L is balanced binary tree, but has any different with general balanced binary tree, and the standard of deleting at every turn and insert the judgement order of elements is different.
If 5 exist nu and u simultaneously, judge whether two line segments intersect, if produce new intersection point, and new intersection point is inserted into new intersection point in Q as new case point on the right of sweep trace.If have simultaneously nd and d, carry out same operation.Certainly, if there is no nu and nd, if having so u and d, just carry out the crossing detection of u and d, if produce new intersection point, and new intersection point is inserted into new intersection point in Q as new case point on the right of sweep trace.
As long as also have the case point in Q, continue other case point is as above operated.May produce new case point in process, be inserted into appropriate location in Q.
If when processing a certain case point, new intersection point occurred, two line segments of this intersection point are respectively to come from workpiece path and the outer side path of cutter, so, global interference just occurred.
In the cutter complementary modulus piece of reality, efficient global interference module realizes very complicated.Relating to L middle conductor renewal operation is actually according to adopt the slope judgement standard of complete idea at the sweep trace Left or right.Complete method of the present invention, needing can be from specifying line segment to travel through in order in state queue L, and this is in order to search out faster adjacent segments to be determined.
Adopted the control method that realizes the cutter radius compensation global interference in the digital control system of this invention, it is first arranged the end points of the composition line segment of side path outside original workpiece path and cutter by order from left to right, and end points is deposited in event queue according to top-down order; Whether case point is arranged in then decision event formation, if do not have, do not have global interference, if having, utilize sweep trace from left to right to scan case point in described event queue, and according to the formation of scanning mode update mode; Judge then whether the line segment in state queue produces intersection point, no is to judge further whether the line segment that consists of intersection point is respectively the composition line segment of original workpiece path and the composition line segment of the outer side path of cutter, if there is global interference in report.The method is carried out global interference judgement fast based on sweep trace, its working time is only relevant to intersection point of line segments quantity, thereby can guarantee that judgement speed is fast, accuracy rate is high, and can the real-time alerting user may produce the situation of cutting with current workpiece processing tool, be applicable to complicated workpiece processing, and realize the control method of cutter radius compensation global interference in digital control system of the present invention, its implementation is easy, realizes with low cost.
In this instructions, the present invention is described with reference to its specific embodiment.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (5)
1. realize the control method of cutter radius compensation global interference in a digital control system, it is characterized in that, described method comprises the following steps:
(1) digital control system generates the outer side path of cutter according to original workpiece path;
(2) digital control system is arranged the end points of the composition line segment of described original workpiece path and the outer side path of cutter by order from left to right, and described end points is deposited in event queue according to top-down order;
Whether (3) digital control system judges case point in described event queue, if do not have, method ends, if having, enter step (4);
(4) digital control system init state formation; All line segments that described state queue intersects in order to store current and sweep trace, and specified order storage;
(5) digital control system utilizes sweep trace from left to right to scan case point in described event queue, and upgrades described state queue according to scanning mode;
(6) digital control system judges whether the line segment in described state queue produces intersection point, and no is to enter step (7), if not, returns to step (5);
(7) digital control system is inserted intersection point in described event queue, and judge whether the line segment that consists of intersection point is respectively the composition line segment of original workpiece path and the composition line segment of the outer side path of cutter, if enter step (8), if not, return to step (5);
(8) there is global interference in the digital control system report.
2. realize the control method of cutter radius compensation global interference in digital control system according to claim 1, it is characterized in that, described case point is the intersection point of the composition line segment of described original workpiece path or the outer side path of cutter.
3. realize the control method of cutter radius compensation global interference in digital control system according to claim 2, it is characterized in that, described digital control system is upgraded described state queue according to scanning mode, is specially:
Described digital control system enters described state queue with the line segment sequential update after described case point.
4. realize the control method of cutter radius compensation global interference in digital control system according to claim 3, it is characterized in that, described digital control system judges that whether the line segment in described state queue produces intersection point, specifically comprises the following steps:
(61) described digital control system judges whether the line segment order of upgrading in described state queue has new adjacent segments;
(62) described digital control system judges whether described new adjacent segments can produce intersection point.
5. realize the control method of cutter radius compensation global interference in digital control system according to claim 3, it is characterized in that, described state queue is the state queue of balanced binary tree construction.
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| CN104281091A (en) * | 2013-07-02 | 2015-01-14 | 发那科株式会社 | Numerical control apparatus having function of reducing path to start point in canned cycle |
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| CN110908332A (en) * | 2019-12-05 | 2020-03-24 | 上海维宏电子科技股份有限公司 | Method for realizing cutter radius compensation control for arc cutter path in numerical control system |
| WO2020133272A1 (en) * | 2018-12-28 | 2020-07-02 | 深圳配天智能技术研究院有限公司 | Interference detection method and device for cutter radius compensation, and storage device |
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| CN111580456A (en) * | 2020-04-08 | 2020-08-25 | 广州奇芯机器人技术有限公司 | Method for realizing cutter radius compensation on small line segment continuous track |
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| WO2020133272A1 (en) * | 2018-12-28 | 2020-07-02 | 深圳配天智能技术研究院有限公司 | Interference detection method and device for cutter radius compensation, and storage device |
| WO2020133271A1 (en) * | 2018-12-28 | 2020-07-02 | 深圳配天智能技术研究院有限公司 | Interference detection method and apparatus for cutter radius compensation, and storage apparatus |
| CN111684375A (en) * | 2018-12-28 | 2020-09-18 | 深圳配天智能技术研究院有限公司 | Interference detection method and device for cutter radius compensation and storage device |
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| CN111580456A (en) * | 2020-04-08 | 2020-08-25 | 广州奇芯机器人技术有限公司 | Method for realizing cutter radius compensation on small line segment continuous track |
| CN111580456B (en) * | 2020-04-08 | 2021-05-18 | 广州奇芯机器人技术有限公司 | Method for realizing cutter radius compensation on small line segment continuous track |
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