CN105345187B - Enclosed blisk electric discharging machining electrode maximum free movement travel path searching method - Google Patents
Enclosed blisk electric discharging machining electrode maximum free movement travel path searching method Download PDFInfo
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- CN105345187B CN105345187B CN201510822228.3A CN201510822228A CN105345187B CN 105345187 B CN105345187 B CN 105345187B CN 201510822228 A CN201510822228 A CN 201510822228A CN 105345187 B CN105345187 B CN 105345187B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
- B23H9/10—Working turbine blades or nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H2400/00—Moving mechanisms for tool electrodes
Abstract
A kind of maximum free movement travel path searching method of enclosed blisk electric discharging machining electrode, it is to optimize final on trajectory, the direction vector of the end face center of the end face center sensing electrode afterbody of electrode head as the reference direction of electrode movement to be gone out using the final position that electrode is fed as optimization track starting point, electrode mass motion outside runner, and the process that electrode moves to optimization final on trajectory from optimization track starting point is divided into some stages；Electrode obtains next movement node in the stage from a movement node in each stage along reference direction without interferingly translational motion, while electrode carries out electrode rotary shaft pose adjustment in each movement node；Electrode after interferingly moving to outside runner without whole movement nodes are obtained, and it is complete optimization track glossily to have connected all nodes；Optimization track is carried out into Coordinate Conversion to obtain feeding track without interference.The present invention is applied to the flow passage structure of different morphologies, and optimization track search success rate is high, can realize it is multi-shaft interlocked, it is high in machining efficiency.
Description
Technical field
It is specifically a kind of fiery for enclosed blisk electricity the present invention relates to a kind of technology of field of machinery automation
Method of the electrode without interference feeding track is obtained in flower process.
Background technology
Leaf disk-like accessory is one of core component of Aero-Space engine, is also the key factor for determining engine performance
One of.With developing rapidly for Aero-Space cause, the demand for leaf disk-like accessory is also more and more, and for its manufacture essence
The requirement of degree and efficiency is also being improved constantly.Complicated, especially the enclosed overall structure, its blade tip of leaf disk-like accessory
With the presence of a circle integral shroud, semi-enclosed structure can be presented in runner, and great challenge is brought to processing.And the leaf of enclosed blisk
Piece, disk body and integral shroud are processed by same blank, are processed very difficult.
At present, electrical discharge machining is the effective means for solving enclosed blisk processing problems.The processing technology is most crucial
The problem of be how to obtain feeding track of the shaped electrode without interference, the acquisition of feeding track is related to electrical discharge machining and could entered
OK, the efficiency of processing and is affected to a certain extent.
By the retrieval discovery to prior art, Liao Pingqiang et al. exists《Shaped electrode enters in shrouded blisk processing
Give track search technique study》In propose it is a kind of in the hope of power taking pole smallest reduction amount be object function track search method,
This method needs electrode to move stepping-in amount along X-axis every time, is then adjusted on other axles, but this method can only
Scanned for for four-axle linked lathe, i.e. the rotation comprising XYZ translations and about the z axis, for five axles and six axle lathes, this method
All frees degree can not be effectively utilized, the working ability of lathe can not be embodied completely, and the electricity that this method is considered
Pole processing form is single, needs not describing well using the process that subdivision is handled for electrode.
Liu Xiao et al. proposes a kind of " Conjugate method " track search method, allows electrode as far as possible along runner center by control
Line is moved, so as to allow electrode movement to go out runner, this method is divided into two steps of pre-optimized and re-optimization in search, needed
Adjust center lines of electrodes and runner center line be tangent in outlet port, this method can obtain multi-shaft interlocked forms of motion,
For the diversified forms of leaf disk-like accessory, this method can easily obtain electrode trace, but pass through subdivision for electrode
Processing, in the case that center lines of electrodes has very large deviation with runner center line, search procedure then can not be effectively using electrode
Some spaces, searching for successful probability can be greatly affected.
By the retrieval discovery to prior art, Chinese patent literature CN104117741A, open (bulletin) day
2014.10.29, a kind of enclosed blisk electrical discharge machining six-axis linkage perturbation feeding side in digital control processing field is disclosed
Method, the technology is disturbed a little by the basis of electrode main motion track, increasing perpendicular to the reciprocal of main motion course bearing,
Each node i.e. on electrode main motion track, obtains the ginseng in the perturbation direction of feed changed perpendicular to electrode head pose
Plane is examined, the extreme position that then can be moved according to electrode in reference planes obtains region of perturbation；Enclosed again in region of perturbation
Around main motion track optimization of collection reference mode, new direction of feed is obtained through fitting successively, through increasing densification node, branch is formed
Hold the perturbation feeding track of most six-axis linkages；Last output perturbation feeds the numerical control machining code of track, is realized by electrode
Enclosed blisk electrical discharge machining with optimization cutter lifting action.This method is taken the photograph by increasing on the basis of existing track
Dynamic mode improves processing chip removal ability, and then improves electrical discharge machining efficiency, that is to say, that this method is not for electricity
Polhody search procedure, and more is that existing track is optimized.
The content of the invention
The present invention is directed to deficiencies of the prior art, it is proposed that a kind of enclosed blisk electric discharging machining electrode
Maximum free movement travel path searching method, this method is not limited by enclosed Blisk form, can be common to
The processing of polytype enclosed blisk class part such as the turbine disk, nozzle ring and impeller of pump.
The present invention is achieved by the following technical solutions：
The final position that the present invention is fed using electrode is optimization track starting point, electrode mass motion goes out outside runner is optimization
The direction vector that final on trajectory, the end face center of electrode head point to the end face center of electrode afterbody is used as the reference of electrode movement
Direction, some stages are divided into by the process that electrode moves to optimization final on trajectory from optimization track starting point；Electrode is from each stage
A movement node obtain next movement node in the stage without interferingly translational motion, translational motion is by one along ginseng
Examine the amount of movement on direction and an adjustment amount in the plane of reference direction is constituted, while electrode is in each motion segment
Point carries out electrode rotary shaft pose adjustment；Electrode after interferingly moving to outside runner without whole movement nodes are obtained, using three
It is complete optimization track that secondary SPL, which has glossily connected all nodes,；Optimization track is subjected to Coordinate Conversion and obtains nothing
Interference feeding track；
Described amount of movement refers to that adjacent phases, along the spacing in reference direction, occur and leaf when electrode moves the spacing
Disk then reduces amount of movement when interfering, and is decreased to still interfere during leaf dish requirement on machining accuracy value, then terminates to optimize the rule of track
Draw, change electrode, restart to optimize track search using amended electrode.
Described adjustment amount refers to：Determine after amount of movement, the traveling electrode in the plane perpendicular to reference direction is found out
The moving region that electrode is not interfered with leaf dish, regard the region as not interference region；Can be along with electrode in not interference region
The maximum position of the reference direction amount of continuing to move to is as movement node, and the vector of amount of movement terminal to the movement node is adjustment
Amount.
Described electrode rotary shaft pose adjustment refers to：In the range of ensuring electrode and leaf dish without interference on movement node
Adjust electrode rotary shaft pose so that electrode continues on maximum without interference amount of movement in reference direction.
Described Coordinate Conversion refers to optimization track inversely obtaining electrode without interference feeding track, and output meets electric fire
The numerical control code of flower machine tooling forms of motion.
During actual processing, electrode and leaf dish all can be moved each；Because motion is relative, it is determined that electricity
The motion of leaf dish is transformed into the motion of electrode by pole when feeding track, that is, is simplified to the sports immunology institute relative to leaf dish with electrode
Have the motion of kinematic axis, it is determined that behind electrode feeding track reduction obtain the actual motion track of leaf dish and electrode.
Technique effect
Compared with prior art, the present invention has the following technical effect that：
1) track search success rate is high：Look for possessing maximum on each position that electrode exits runner to outside runner
The point of movement tendency, finally allows electrode to be moved to along a track for possessing the largest motion trend to outside runner outside runner,
It is greatly enhanced the successful possibility of track search；
2) versatility is good：Suitable for the flow passage structure of different morphologies, it is not necessary to carry out extracting the complexity such as the center line of runner
Operation, can also reduce because the influence that central line pick-up is different and is produced to search；
3) it is multi-shaft interlocked, high in machining efficiency：, can be with due to the motion mode of not strict limitation electrode in search procedure
Selection participates in the free degree of motion as needed, and highest includes six-freedom degree；And it is equally possible if reducing some frees degree,
This is very favorable when some freedoms of motion are restricted；In track search, two kinds of motions are acted on simultaneously
To on electrode, the working ability of lathe is farthest utilized；When electrode is fed, it can be compared by multi-shaft interlocked
Good discharge condition, improves processing efficiency to a certain extent.
Brief description of the drawings
The schematic diagram that Fig. 1 defines for each kinematic axis of electrical discharge machining in the specific embodiment of the invention；
Fig. 2 is flow chart of the determination electrode without interference feeding track in the specific embodiment of the invention；
Fig. 3 is the schematic diagram of reference direction defined in the specific embodiment of the invention, wherein：The direction of arrow is reference side
To arrow end round dot is electrode tail end face center, and rectilinear end round dot is electrode head end face center；
Fig. 4 is the schematic diagram of acquisition i+1 node in the specific embodiment of the invention；
Fig. 5 is the schematic diagram in the specific embodiment of the invention around electrode rotary shaft A axial adjustment electrode postures；
Fig. 6 feeds schematic diagram for electrode in the specific embodiment of the invention without interference；
Embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out lower premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementations
Example.
Embodiment 1
It is respectively along X, Y, Z as shown in figure 1, illustrating the definition of each kinematic axis of electrical discharge machining enclosed blisk
Three direction motions and the rotary motion around tri- directions of X, Y, Z；Fixed electrode is fed without interference really involved by the present embodiment
The method flow of track is as shown in Figure 2.
Comprising the following steps that for the present embodiment is described：
1) electrode movement reference direction is determined：In enclosed blisk process, electrode can exit runner and most close
The factor of key is to produce along the trend moved to outside runner；In general, the position outside runner is finally moved to from electrode
From the point of view of initial position contrast, electrode is along can will than the amount of exercise on other directions to the upward amount of exercise of runner foreign side
Greatly, the reference direction that electrode movement is chosen with the direction aids in determining whether to optimize track；The present embodiment is by the electrode of selection
One end in the middle of runner is as head, positioned at one end of flow channel entry point as afterbody, when moving to afterbody from head, electricity
Pole also can be just moved out outside runner substantially；In order to without loss of generality, as shown in figure 3, electrode head portion end face center is referred to
Rearwardly at the same time the direction vector of end face center determines the final position of electrode feeding as the reference direction of electrode movement
Go out for optimization track starting point, electrode mass motion outside runner is optimization final on trajectory；
2) Partitioning optimization track each stage：The process that electrode is moved into optimization final on trajectory from optimization track starting point is divided
For some stages, each stage can determine according to runner form or the position in the middle of runner；For between divided stages
Away from proportional spacing can be used, it would however also be possible to employ gradual change spacing；In order to avoid the too small caused electrode trace of spacing is excessively numerous
It is trivial, and spacing it is excessive caused by the track interstage it is uncontrollable, therefore spacing size minimum be set to leaf dish machining accuracy will
Evaluation, maximum is set to ten times of leaf dish requirement on machining accuracy value；The present embodiment initially uses minimum spacing in divided stages, with
Electrode to outside runner progressively close to appropriate increase spacing, workload can be reduced by so becoming the divided stages of spacing, improve true
The efficiency of each fixed movement node；
3) movement node in each stage is determined：In order to without loss of generality, be divided for i-th of stage for optimizing track
Analysis, detailed process is found out i+1 movement node and terminated as shown in figure 4, the motion in the stage is since i-th of node；I-th
The motion in individual stage is divided into：Along reference direction and perpendicular to the plane of reference direction, i.e., the amount of exercise in i-th stage
It is decomposed into the amount of movement along reference direction and the adjustment amount perpendicular to reference direction；Amount of movement is determined, afterwards perpendicular to ginseng
Traveling electrode in the plane in direction is examined, the moving region that electrode is not interfered with leaf dish is found out, regard the region as not interference region；
Can be along the maximum position of the reference direction amount of continuing to move to as i+1 movement node using electrode in not interference region, should
The distance of intersection point of the movement node to reference direction in not interference region is adjustment amount；Dotted line is electrode along ginseng in Fig. 4
Examine direction movement after position, and contrast two adjustment amounts position, it can be found that the position on right side along reference direction after
Continuous amount of movement is bigger than leftward position, then it is assumed that right positions are more excellent than leftward position；Electrode is it is determined that along the shifting in reference direction
Need to carry out checking interference during momentum, then need to reduce amount of movement if there is interference, it is still dry when being decreased to minimum spacing
Relate to, then illustrate that electrode needs modification, treat that electrode has been changed and repeat the above steps 1) -3)；
4) each stage electrode pose adjustment：It is determined that after the i+1 movement node in i-th of stage, in the movement node
On, adjust the posture of electrode；As shown in figure 5, on two circumferential pose adjustment positions of electrode, the electrode of upper side being capable of edge
Reference direction and continue big compared with lower section side without interference amount of movement, then illustrate that up progress pose adjustment in side is more excellent；
Complete electrode pose adjustment after, return to step 3) carry out next stage on movement node search；
5) optimization trajectory coordinates conversion：After obtaining optimizing all nodes of track, all nodes have glossily been connected
Come, obtain the optimization track of a smooth-going, optimization track is inversely obtained into feeding track of the electrode without interference；By the fortune of electrode
Dynamic to change into the motion for meeting spark-erosion machine tool characteristic, finally output can be used for the numerical control code of electrical discharge machining.
The G code (fragment) that lower additional copy embodiment is obtained：
G01X 33.8348Y-3.3140Z 60.5500A 3.9500C-14.5500；
G01 X 33.7373 Y -3.1745 Z 60.5000 A 3.7000 C -14.3500；
G01 X 33.6355 Y -3.0916 Z 60.5500 A 3.5000 C -14.5000；
G01 X 33.5384 Y -2.9298 Z 60.5000 A 3.2500 C -14.2500；
G01 X 33.4384 Y -2.8798 Z 60.5500 A 3.1000 C -14.2500；
G01 X 33.3389 Y-2.7574 Z 60.5000 A 2.9000 C-14.2000。
Claims (3)
1. a kind of maximum free movement travel path searching method of enclosed blisk electric discharging machining electrode, it is characterised in that
It is optimization final on trajectory, electrode to be gone out using the final position that electrode is fed as optimization track starting point, electrode mass motion outside runner
The end face center on head points to the direction vector of the end face center of electrode afterbody as the reference direction of electrode movement, by electrode from
The process that optimization track starting point moves to optimization final on trajectory is divided into some stages；A movement node of the electrode from each stage
Obtain next movement node in the stage without interferingly translational motion, translational motion is by one along moving in reference direction
Amount and an adjustment amount in the plane of reference direction are constituted, while electrode carries out electrode rotary in each movement node
Axle pose adjustment；Electrode is smooth using cubic spline curve without whole movement nodes are obtained after interferingly moving to outside runner
It is complete optimization track that ground, which has connected all nodes,；Optimization track is carried out into Coordinate Conversion to obtain feeding track without interference；
Described adjustment amount refers to：Determine after amount of movement, the traveling electrode in the plane perpendicular to reference direction finds out electrode
The moving region do not interfered with leaf dish, regard the region as not interference region；Can be along reference with electrode in not interference region
The amount of continuing to move to maximum position in direction is as movement node, and the vector of amount of movement terminal to the movement node is adjustment amount；
Described electrode rotary shaft pose adjustment refers to：Ensure electrode with leaf dish without adjustment in the range of interference on movement node
Electrode rotary shaft pose so that electrode continues on maximum without interference amount of movement in reference direction.
2. according to the method described in claim 1, it is characterized in that, described amount of movement refers to adjacent phases along in reference direction
Spacing, then reduce amount of movement when electrode is moved when the spacing occurs and interfered with leaf dish, and be decreased to leaf dish requirement on machining accuracy
Still interfere during value, then terminate to optimize the planning of track, change electrode, optimization track is restarted using amended electrode and searched
Rope.
3. according to the method described in claim 1, it is characterized in that, described Coordinate Conversion refer to will optimization track inversely obtain electricity
Pole feeds track without interference, and exports the numerical control code for meeting spark-erosion machine tool working motion form.
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| CN106363258B (en) * | 2016-08-31 | 2018-03-06 | 上海交通大学 | Rarefaction feeds the electric discharge machining method of node |
| WO2018145260A1 (en) * | 2017-02-08 | 2018-08-16 | General Electric Company | Electromachining systems and methods |
| CN109396578B (en) * | 2018-12-03 | 2019-12-31 | 哈尔滨工业大学（深圳） | Method for planning electrode feeding track in maximum motion range of closed type integral turbine blade disc |
| CN113618176B (en) * | 2021-08-13 | 2022-08-30 | 合肥工业大学 | Electromagnetic control type blisk electrolytic machining device and method |
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| CN103521861B (en) * | 2013-09-29 | 2015-10-28 | 南京航空航天大学 | Based on blisk profile electrolytic machining device and the method for three-dimensional complex wake |
| CN103990875B (en) * | 2014-05-09 | 2017-05-17 | 首都航天机械公司 | Compound electrode machining method for improving efficiency of electric spark machining of turbine disc with blade tip shroud |
| CN104084654B (en) * | 2014-07-15 | 2016-08-31 | 上海交通大学 | Six-axis linkage space shake electric discharge machining method |
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