Machining method for multiple different-position grooves of aero-engine compressor
The invention relates to a method for processing a multi-ectopic slot of an aircraft engine.
The existing method for milling the inner and outer (multi-position) grooves of the depth of the aero-engine compressor, because some narrow, deep and small abnormal position grooves are often formed on the parts of the air compressor of the aeroengine, the (multi-dislocation) groove is narrow, deep, small, the inclined groove is irregular, the position is not fixed, the R radian has a large or small value, a processing area with multiple characteristics such as high processing precision requirement and the like, the narrow deep groove is narrow, deep, small, irregular and not fixed due to the fact that the heterotopic groove is narrow, deep, small and not fixed, a suitable cutter is not arranged in the prior art, the (multi-dislocation) groove can be simply and quickly processed in place, the processing process is complex, multiple cutters are required to be matched and applied, the inclined groove and the narrow deep groove are subjected to repeated tool setting, and the machining risk of the groove is increased by adjusting the cutter (the 35-degree acute-angle cutter is adopted for milling in the second step), and a large amount of time is wasted.
The first case is the processing of the chute: the seed (multi-dislocation) groove is processed by using a common cutter to directly go, a cutter left side is used for tool setting, a cutter right side is used for tool setting to be matched with the cutter to be processed to remove the allowance in a groove cavity, the allowance is removed, then a 35-degree sharp cutter is used for left, two directions on the right are used for tool setting to be matched with the cutter to be processed to be in place, the (multi-dislocation) groove is processed, the cutter needs to be repeatedly set for 4 times, the 35-degree sharp cutter is used for adjusting the cutter to 2 times, 2 cutters are used in a matched mode, the adjusting process is quite complex, the processing risk of the (multi-dislocation) groove is increased (quality accidents are easy to occur) through phase change, and a large amount of time and manpower are wasted. In the second case: for the processing of a narrow deep groove, the groove (with multiple different positions) is special in position, the groove width is narrow, the groove can only be processed by a cutter when being deep, and a 35-degree sharp knife cannot be matched with the groove to be processed in place so as to meet the requirement of dimensional technological dimension precision, but the groove width of the groove (with multiple different positions) can only be processed in place when the cutter is used for processing by a traditional method, the R angle requirement of the groove bottom is uncontrollable, the R angle on the groove bottom is not required to be matched with the R angle of the cutter when the operation is good, and the R angle is larger than the R angle of the cutter when the technological dimension R angle is larger than the R angle of the cutter, the phenomenon of over-cutting of the R angle is not easy to control! Cause the process dimension to be out of tolerance!
The main processing difficulties are summarized: the (multi-dislocation) groove is narrow, deep, small, irregular, unfixed in position, and quick and in-place turning without a proper cutter; if the 35-degree acute angle cutter needs to be subjected to repeated tool setting, time and energy are needed when tool setting is increased once, and the difficulty is increased in precision control. An over-cut region is likely to occur when a large R groove is cut with a small R cutter.
The machining method is simple and convenient to operate in the using process, can ensure the machining precision, can ensure the machining requirement of the (multi-dislocation) groove of the aero-engine compressor, improves the labor productivity and the quality, brings convenience to tool management work in a production field, and reduces the waste of machining cost.
Disclosure of Invention
The invention aims to provide a method for processing a multi-dislocation groove, aiming at the problems. In particular, a cutting knife is used for processing a chute and a narrow deep groove, and a 35-degree acute angle tool is not adopted for tool changing and milling; the problems that two (multiple different position) grooves of the chute and the narrow deep groove are narrow, deep, small and irregular, the positions of the chutes are not fixed, the requirement on machining precision is high, no proper cutter is arranged and the like are solved, and the problem that the machining precision of the two (multiple different position) grooves is high is solved through the optimization of the motion program of the cutting knife. The invention is designed mainly based on the size precision requirement of the existing equipment and parts, not only can ensure the processing requirement of the parts, but also can improve the labor productivity, and has the advantages of simple manufacture, convenient maintenance and lower manufacturing cost.
The technical scheme of the processing method of the invention is as follows: a method for processing multiple heterotopic grooves of an aircraft engine compressor comprises the steps of selecting a common cutter with proper width to replace a conventional cutter for cutting, wherein the radian of the corner of the cutter is R0.2, and processing a chute (an inclined plane groove) by 1) firstly milling the middle part of the chute by using the common cutter according to the shape of the chute, and keeping the allowance to be at least 0.1mm to prevent the large allowance from colliding with the subsequent processing of the cutter; 2) taking the circle center with the radian of the corner of the cutting knife being R0.2 as a tool setting point, programming a tool setting locus, wherein the tool setting locus is respectively cut into the groove along an oblique line parallel to the left chute, translating for 2-8mm along the groove bottom (or translating for lifting the tool at the whole position of the groove bottom) after reaching the groove bottom, and then lifting the tool, wherein the tool setting point is not required to be changed, a program is called to machine one side of the groove in place, and 3) the tool setting point is also not required to be changed, and the program is called to machine the right chute at the other side of the groove in place.
The method for processing the narrow and deep groove comprises the steps of taking an externally tangent rectangular corner point of a cutting knife with the radian of a corner part of the cutting knife being R0.2 as a track of a cutter setting point, programming the track of the cutting knife, wherein the track of the cutter setting point (in a groove body workpiece) is a straight line in a groove body, programming the radian of the groove corner part according to an arc line of the groove corner, milling the surfaces of two sides of the groove by the cutting knife from top to bottom, translating the bottom of the processed groove, and lifting the cutting knife.
Has the advantages that: the chute and the narrow deep groove can be easily machined as long as the edge and the edge end of the cutter have enough precision (the newer cutter can be basically used, and the R arc of the edge end is smaller), so that the complicated chute and the narrow deep groove (multiple different positions) can be machined in place, all dimensions completely meet the process requirements, the operation is simple, convenient, safe and efficient, the machining precision can be ensured, a large amount of time and labor can be saved in machining, the occupation of the machine time of equipment is small, and the use cost of tools (cutters) is low. The improved cutter setting method and the cutter path programming method are optimized processing methods, because the common cutter has special shape, the R of the edge end is smaller, the groove angle of a large R arc can be processed, and the tool setting points which can be selected have a plurality of tool setting points, so that the tool setting method has more functionality.
FIG. 1 is a 2D view of an aircraft engine compressor (multi-dislocation) groove;
FIG. 2 is a 2D diagram of a common cutter;
FIG. 3A is a schematic view of the cutting knife removing a large amount of the allowance in the middle of the chute; leaving a margin of less than 0.5 mm;
FIG. 3B is a schematic view of the cutting knife;
fig. 4A, 4B, and 4C are schematic views of the chute. Fig. 4A is a diagram of processing a left chute, fig. 4B is a diagram of processing a left chute, and fig. 4C is a schematic diagram of processing a left chute and a right chute.
FIG. 5A and FIG. 5B are schematic diagrams illustrating detailed operations of FIG. 4A and FIG. 4B, respectively;
FIG. 6, FIG. 7, FIG. 8 are schematic views of three steps of narrow and deep groove processing;
fig. 9 is an enlarged view of a portion a of fig. 8.
The invention is described in further detail below with reference to the attached drawing figures: the proper common cutter is selected to replace the conventional cutter for cutting, and the cutter setting method and the program optimization are improved to machine the (multi-dislocation) groove in place.
By using the processing method, the purpose of multipurpose one cutter can be realized by using the (multi-position) groove size processing parts in place, the operation is simple, repeated cutter setting is not needed, a large amount of time and labor are saved, and the processing risk is reduced.
For the first left and right chute case before: firstly, selecting a proper tool setting point of a common cutter according to the shape and the characteristics of a (multi-ectopic) groove, selecting the tool setting point, and finishing the tool setting by three steps: removing a large amount of allowance in the middle part, preventing the large allowance from colliding with a cutting knife and preventing the cutting knife from being cut normally, and the second step: the tool setting point does not need to be changed, the left oblique line and the right oblique line are used as tool setting lines, an optimized program is called to machine one side of the groove in place, time and labor are saved conveniently, and the third step is as follows: therefore, the groove is not easy to be processed, but the groove is very complicated to process (multiple different positions), all the sizes completely meet the process requirements, the operation is simple, convenient, safe and efficient, the processing precision can be ensured, and a large amount of time and labor force can be saved.
The processing of the narrow and deep groove processing for the second case:
firstly, selecting a proper tool setting point according to the actual situation of the solid structure of the workpiece, such as fig. 6, fig. 7 and fig. 8; then, the method also comprises three steps: the first step is as follows: removing a large amount of allowance in the middle part to prevent the large allowance from colliding with a cutter and preventing normal cutting, as shown in fig. 6; the second step is that: the tool setting point does not need to be changed, and an optimized program is called to machine one side of the groove in place, so that the time and the labor are saved conveniently; as shown in FIG. 7; the third step: the tool setting point does not need to be changed, and the optimized program is called to machine the other side of the groove in place. As shown in fig. 8.
The surfaces of two sides of the groove are the surfaces of the processing groove of the upper cutting knife and the lower cutting knife, the bottom of the processing groove is translated, the knife is lifted, and the surfaces of two sides of the groove are processed by the upper cutting knife and the lower cutting knife or the upper cutting knife from bottom to top; see fig. 8 and 9, respectively.
Fig. 9 is an enlarged view of a in fig. 8, showing a trajectory of the cutter, in which: the tool setting point 3 (of the cutting knife), the track 4 (program set track) of the optimized tool setting point of the cutting knife and the solid outline 5 of the ectopic groove. Taking the circumscribed rectangle corner point with the radian of the corner of the cutting knife being R0.2 as the locus of the tool setting point, wherein the locus is a rightward oblique upper arc and then returns to the left (a concave arc on the lower surface of the cutting groove); if the upper surface of the cutting groove is concave, the arc of the corner of the cutting knife is R0.2, the corner point of the circumscribed rectangle with the circle center is the track of the tool setting point, and the track is inclined downwards rightwards and then returns to the left.
When the arc line is machined, the travel track of the tool nose for tool setting of R0.2 can be positioned in the workpiece.
In summary, the following steps: the method has the advantages of simple operation, strong practicability and flexible use, is suitable for the ectopic groove at any position, basically has three steps in operation, and can ensure that the practicability of the common cutter is stronger by flexibly selecting the cutter setting point. The machining process requirements of the (multi-dislocation) groove of the aero-engine compressor can be met, labor productivity and quality are improved, tool management work on a production site is facilitated, and waste of machining cost is reduced.