CN102411334B - Plunge milling cutter path optimization method - Google Patents
Plunge milling cutter path optimization method Download PDFInfo
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- CN102411334B CN102411334B CN2011103046183A CN201110304618A CN102411334B CN 102411334 B CN102411334 B CN 102411334B CN 2011103046183 A CN2011103046183 A CN 2011103046183A CN 201110304618 A CN201110304618 A CN 201110304618A CN 102411334 B CN102411334 B CN 102411334B
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Abstract
The invention provides a plunge milling cutter path optimization method. Each plunge milling cutting path cycle comprises a slow drop processing cutter path. The method comprises the following steps: step 1: according to a plunge milling processing cutter tool path and a blank characteristic, calculating and adding a slow drop processing cutter path, and generating a corresponding cutter location point and a cutter axis vector; step 2: according to the cutter location point, the cutter axis vector and a part characteristic, calculating and adding the cutter paths of plunge milling feed, plunge milling moving and rapid return, and calculating and optimizing a plunge milling depth of each cutting path of the plunge milling so that the plunge milling depth of one knife after being processed by the plunge milling is shallower than the plunge milling depth of the previous knife. The slow drop feed and the each step plunge milling depth can effectively prolong a service life of the cutter. The moving and the rapid return can effectively improve surface quality of part processing and substantially shorten plunge milling processing time. The method can be widely used in three axis, four axis and five axis plunge milling processing.
Description
Technical field:
The present invention relates to the milling cutter path planning, a kind of tool paths optimization method mill processing of inserting specifically is provided, be applicable to all kinds of aviation impellers, die cavity spare slotting milled processing.
Background technology:
Slotting milling is a kind of job operation that realizes high resection rate metal cutting.For the larger processing of length that overhangs of the Machining of Curved Surface of difficult-to-machine material, grooving processing and cutter, the working (machining) efficiency of inserting milling is far away higher than the face milling of routine.In addition, insert and to mill processing and also have the following advantages: can reduce workpiece deformation; But reducing effect is in the radial cutting force of milling machine, this means that main shaft that axle system has worn and torn still can be used for inserting to mill processing and can not affect the workpiece crudy; The cutter length that overhangs is larger, and this Milling Process for workpiece groove or surface is very favourable; Can realize the grooving processing to high-temperature alloy material.Slotting milling is fit to the roughing of mold cavity very much, and recommended highly-efficient processing for the aviation parts.
Existing slotting milling cutter paths planning method often concentrates on the tool path planning that participates in cutting tip, and has ignored the integrated planning that comprises advance and retreat cutter process in slotting milling.Ignore this two significant process, easily cause the impact to cutter when feed, thereby cause crumbling of blade, when withdrawing, original place, along the cutter axis orientation withdrawing, usually can scratch surface of the work, and the harm cutter., in order to protect cutter, adopt lower speed of feed when way is withdrawing usually.In addition, the depth relationship of per step between inserting and milling do not plan, causes part to plug in the milling cutter road and cut wide unexpected increase inserting while milling to bottom, damages cutter.
Find through the literature search to prior art, application number is 200810246906.6 Chinese patent " a kind of aero-engine casing five axle plunge millings ", its cutter path planning main method is on the basis of the cutter path of existing end mill processing, generate and insert milling path, do not relate to the planning of inserting advance and retreat cutter technique while milling; Application number is in 200910219433.5 Chinese patent " closed type integrated leaf dish five coordinates are inserted milling method ", also to inserting, mills processing and comprises the integrated planning of the cutter of advancing and retreat.
Summary of the invention:
The objective of the invention is the deficiency of for existing, inserting the milling path planing method, proposed an inserting and milled the tool paths optimization method of processing.Its impact that can effectively solve while inserting incision workpiece while milling is excessive, the problem such as cutter scratch workpiece during withdrawing.And can greatly improve the existing efficiency of milling processing of inserting.
According to an aspect of the present invention, a kind of slotting milling cutter method for optimizing route is provided, each plug in milling cutter road circulation comprises the slow process tool route that falls, comprise following steps: step 1): according to inserting, mill process tool route and blank feature, calculate and add to delay and fall process tool route, generate corresponding cutter location and generating tool axis vector.
Preferably, each plug in milling cutter road circulation comprises inserting mills feed, the slotting cutter path that moves cutter, rapid return that mills, comprise following steps: step 2):, according to cutter location, generating tool axis vector and part feature, calculate and add to insert and mill feed, the slotting cutter path that moves cutter, rapid return that mills.
Preferably, comprise following steps: step 3): the circulation of the plug in milling cutter road of each single step is coupled together, generate the cutter location file of standard.
Preferably,, according to slotting milling cutter path and part feature, calculate and optimize to insert and mill the slotting degree of depth of milling that respectively goes on foot cutter track, making and insert the slotting slotting depth as shallow of milling of milling the last cutter of depth ratio of milling a rear cutter.-
Preferably, the slow cutter path that falls that each plug in milling cutter road circulation comprises, the speed of feed that cutter is initially cut workpiece is less than the speed of feed of normal process.
Preferably, cutter after the cutwork of completing in inserting the circulation of milling cutter road, moves to the direction away from the workpiece sidewall, and then rapid return is completed to insert and milled circulation.
Preferably,, by the order of inserting the generation of milling cutter road, insert the slotting slotting depth as shallow of milling of milling the last cutter of depth ratio of a rear cutter that mills.
Preferably, the withdrawing cutter track adopts high speed of feed.
Preferably, the high speed of feed of withdrawing cutter track employing is the top speed of lathe.
More specifically, technical scheme of the present invention is: a kind of slotting milling cutter method for optimizing route, and its optimization method is as follows:
1) mill machining path and part geometry shape according to existing inserting, calculate the slow process tool route that falls;
2) cutter path that fall processing excessively slow for resulting increase, calculate to insert to mill and move cutter, rapid return, and each step of optimization inserts and mills the cutter path of the degree of depth;
Principle of work of the present invention is: at first according to cutter location and generating tool axis vector, and the geometric data of surface of the work, calculate slow the falling a little when single step is slotting mills, and generate corresponding cutter location and generating tool axis vector; Again according to cutter location, generating tool axis vector, workpiece, calculate feasible withdrawing position, and generate corresponding cutter location and generating tool axis vector; Finally the circulation on the plug in milling cutter road of each single step is coupled together, and generate the cutter location file of standard.
Wherein calculating slowly while falling cutter track, comprising the speed planning that falls cutter track to slow.Slow cutter track of falling is the cutter track of cutter while just having entered workpiece, and this moment is larger to the impact of cutter, therefore gives lower speed of feed.
When calculating moved the cutter cutter track, the feasible cutter direction of moving referred to move and can not interfere with workpiece to fixing a cutting tool the party.Make cutter leave workpiece owing to moving the cutter cutter track, so the withdrawing cutter track can adopt higher speed of feed, be generally the top speed of lathe.
When cutter track slotting milled the degree of depth before and after optimize calculating, cut wide unexpected increase in order to prevent cutter, the slotting slotting depth as shallow of milling of milling the last cutter of depth ratio of a cutter after should guaranteeing.
The slotting milling path planing method of setting forth in the present invention can be used to slotting in various 3 dimension spaces and mill processing, therefore can be widely used in 3 axles, and 4 axles, 5 axles are inserted and milled processing.
Beneficial effect of the present invention comprises: slow fall feed and each step and insert and mill depth optimization and effectively improved cutter life; Move cutter, rapid return effectively improves the surface quality of part processing, and has greatly shortened and inserted the time of milling processing.
Description of drawings
Fig. 1 is the schematic diagram of inserting the milling mode of motion that mills.
Fig. 2 is the schematic diagram according to the plug in milling cutter road of the moulding generation of part.
Fig. 3 is the slow schematic diagram that cutter track is calculated that falls.
Fig. 4 is the schematic diagram that moves cutter and rapid return cutter track.
Fig. 5 inserts to mill the slotting depth optimization schematic diagram that mills of each step.
Specific implementation method
Below embodiments of the invention are elaborated, the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
The planing method in this slotting milling cutter path is mainly based on inserting the processing mode that mills, and the direction of feed when its characteristics are milling is axial along cutter 1, is applicable to 2 processing of the larger workpiece of axial cutting-in, as shown in Figure 1.
A kind of implementation method of the present invention is as follows:
1, calculate the slotting machining path that mills according to sidewall 11 and the bottom surface 12 of institute's cutting workpiece:
According to sidewall 11 and bottom surface 12 data points of part and process needed surplus and generate the corresponding milling cutter path of inserting, bottom surface inserts that to mill surplus be 1mm in this example, and the sidewall surplus is 0.8mm.During calculating, sidewall ruled surface and workpiece bottom biasing are intersected, can obtain the basic milling cutter path of inserting, as shown in Figure 2.
2, mill machining path according to resulting inserting, calculate the slow process tool route that falls:
According to the sidewall upper sideline 21 of part or blank and the diameter of cutter 1, as shown in Figure 3, calculate cutter and initially cut the coordinate points of workpiece, change feed value take this point as benchmark as 100mm/min.Set the slow distance of falling in this example and be 1mm, after namely cutter enters workpiece 1mm, with this material normal, insert and mill speed 200mm/min and insert and mill.
3, the cutter path that fall processing excessively slow for resulting increase, calculate to insert to mill and move cutter, the cutter path of rapid return:
As shown in Figure 4, according to residue black skin, workpiece sidewall, and the plug in milling cutter road that calculates in the first step, away from work surface, to calculate the direction vector that cutter moves as criterion, and the withdrawing of setting according to this example is apart from 1mm, the coordinate figure of the cutter shift position of calculating., according to the axial vector of cutter, calculate the coordinate of withdrawing point again, and the speed of feed during the change withdrawing is the top speed of lathe.Insert mill enter 32, insert mill move cutter 33, insert mill withdrawing 34 path as shown in Figure 4.
4,, according to the cutter track that obtained in the upper step, calculate the slotting degree of depth of milling that respectively goes on foot cutter track, make and insert the slotting slotting depth as shallow of milling of milling the last cutter of depth ratio of milling a rear cutter:
As shown in Figure 5, according to the previous step cutter track, insert and to mill the degree of depth 43, optimize this step cutter track and insert and mill the degree of depth 42, make the slotting degree of depth 42 of milling of this step cutter track be shallower than the slotting degree of depth of milling of step cutter track.
5, generate and comprise slow falling, feed, move cutter, and slotting the milling of rapid return circulated and connects cutter generation cutter path:
Tool position and vector that above-mentioned three steps are calculated connect, and are output as the code format that lathe can be identified.
Claims (7)
1. a slotting milling cutter method for optimizing route, is characterized in that, each plug in milling cutter road circulation comprises delaying falls process tool route, comprises following steps:
Step 1): mill process tool route and blank feature according to inserting, calculate and add to delay and fall process tool route, generate corresponding cutter location and generating tool axis vector;
The circulation of each plug in milling cutter road comprises inserting mills feed, inserts and mill the cutter path that moves cutter, rapid return, comprises following steps:
Step 2):, according to cutter location, generating tool axis vector and part feature, calculate and add to insert and mill feed, the slotting cutter path that moves cutter, rapid return that mills.
2. slotting milling cutter method for optimizing route according to claim 1, is characterized in that, comprises following steps:
Step 3): the circulation of the plug in milling cutter road of each single step is coupled together, generate the cutter location file of standard.
3. slotting milling cutter method for optimizing route according to claim 1, is characterized in that,, according to slotting milling cutter path and part feature, calculates and optimize to insert and mill the slotting degree of depth of milling that respectively goes on foot cutter track, makes and insert the slotting slotting depth as shallow of milling of milling the last cutter of depth ratio of milling a rear cutter.
4. slotting milling cutter method for optimizing route according to claim 1, is characterized in that, the slow process tool route that falls that each plug in milling cutter road circulation comprises, and the speed of feed that cutter is initially cut workpiece is less than the speed of feed of normal process.
5. slotting milling cutter method for optimizing route according to claim 1, is characterized in that, cutter after the cutwork of completing in inserting the circulation of milling cutter road, moves to the direction away from the workpiece sidewall, and then rapid return is completed to insert and milled circulation.
6. slotting milling cutter method for optimizing route according to claim 1, is characterized in that,, by the order of inserting the generation of milling cutter road, inserts the slotting slotting depth as shallow of milling of milling the last cutter of depth ratio of a rear cutter that mills.
7. slotting milling cutter method for optimizing route according to claim 1, is characterized in that, the withdrawing cutter track adopts high speed of feed.
8. slotting milling cutter method for optimizing route according to claim 1, is characterized in that, the high speed of feed that the withdrawing cutter track adopts is the top speed of lathe.
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| CN102411334B true CN102411334B (en) | 2013-11-20 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI587950B (en) * | 2015-04-10 | 2017-06-21 | Hsin Tien Chang | Butterfly milling method |
| CN106735464B (en) * | 2015-11-24 | 2018-12-14 | 西安航空动力控制科技有限公司 | A kind of slotting milling method of workpiece |
| CN106735481A (en) * | 2016-12-28 | 2017-05-31 | 贵州黎阳国际制造有限公司 | A kind of processing method of aviation parts blind slot |
| US10877463B2 (en) * | 2017-12-06 | 2020-12-29 | D.P. Technology Corp. | Systems, methods, and devices for toolpath virtualization and optimization |
| CN108274206B (en) * | 2017-12-15 | 2020-07-07 | 上海电机学院 | Tool retracting method for Z-shaped feed variable-shaft plunge milling of ternary impeller |
| CN110355409A (en) * | 2019-05-27 | 2019-10-22 | 无锡动力工程股份有限公司 | A kind of concave surface processing design method |
| CN111215675A (en) * | 2020-02-10 | 2020-06-02 | 大连理工大学 | Plunge milling machining method for open type two-dimensional cavity |
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| CN101767218A (en) * | 2008-12-30 | 2010-07-07 | 沈阳黎明航空发动机(集团)有限责任公司 | Five-axis plunge milling method of aeroengine crankcase |
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Address after: 200240 800 Dongchuan Road, Shanghai, Minhang District, Shanghai. Co-patentee after: Shanghai Tuopu CNC Polytron Technologies Inc Patentee after: Shanghai Jiao Tong University Address before: 200240 800 Dongchuan Road, Shanghai, Minhang District, Shanghai. Co-patentee before: Shanghai Putuo Numerical Control Technology Co., Ltd. Patentee before: Shanghai Jiao Tong University |