Insert the milling cutter method for optimizing route
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.
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.