A method of making deep grooves in metal products and milling tool for its implementation

 

(57) Abstract:

The method relates to the manufacture milling deep slots, in particular in the generators and turbines. Grooves wireservice in two passes. In each pass simultaneously perform roughing and finishing processing using a single milling tool that has a cutting edge for roughing and finishing. Milling tool contains throwaway cutting plates, placed on trays with separation width of cut by the main cutting edges of at least two sequentially adjacent in the direction of rotation of tapes with different sets of plates. Improved processing performance of deep grooves and improving the quality of machined surfaces. 2 C. and 14 C. p. F.-ly, 11 ill.

The invention concerns a method of making deep grooves in metal products, in particular, the rotors of the generators and turbines, as well as milling tools for manufacturing these grooves.

Currently, synchronous generators to generate electricity are made with the rotors, which have a diameter of about 2200 mm or more in overall length, vcls forging the so-called barrel, and then equipped with running the length of the rotor parallel longitudinal grooves, which are designed to accommodate winding and ventilation channels and devices for cooling the windings. When the above-mentioned dimensions of the rotor, these grooves are, for example, a depth of about 220 mm and a width of the groove at its widest point of about 40 mm, They can be limited to the bottom of the groove parallel side surfaces, or can be performed stepwise, with separate stages, starting from the circumference to the axis of the rotor are respectively smaller diameters. Additionally, also known variants of execution, in which the slots of the rotor at least parts are mainly V-shaped profile. These forms of grooves caused by an electrical requirements and considerations that arise from the need for uniform drainage arising in the winding heat losses. As surrounded by electrical insulating material of the active side of the coil winding on the one hand very sensitive to mechanical loads, and on the other hand it must be ensured accurate gapless fit with close tolerances sides in the slots of the rotor, the slots of the rotor at least in areas, which are intended for the th precisely machined surface.

The slots of the rotor milled on the cylindrical pre-honed body of the rotor using the so-called grooved rotary cutters, this disc cutters, which are specially designed for this purpose. In practice, doing so for a large number of successive passes of the slots of the rotor initially roughly processed to different levels during different processing steps, i.e., handled roughly, and then processed completely. Holding roughing and finishing is done using a special roughing and finishing milling tools, which are designed exclusively for the appropriate technological operation roughing or finishing. Typically, the groove of the rotor initially, during the first operation rough milled to the depth of the first stage equipped with throwaway cutting blades roughing milling head, then using another tool in the second pass through feature throwaway cutting blades finishing disc cutters processed surface of the product in the first stage is processed completely. After that, the tool and replace with another instrumedley cutters, then after replacing the instrument with the fourth tool in the form of a throwaway feature cutting blades finishing disc cutters definitively process completely the second stage, after which should be processed in the same way the third step, in which, if we were talking only about the cooling channel, from the operation finishing often.

In the case of grooves parallel with the side surfaces of the cooling channel labor costs were slightly lower, however, in this case, the first stage of the first rough milled to approximately half the depth of the groove by means of the roughing cutters, then for the second pass up to the final bottom of the groove the second step is milled completely through another tool, and finally, in the third pass with special finishing tool is finishing operation.

This known type of manufacturing slots of the rotor causes, firstly, the need to keep ready a large number of different disk cutters and put up with the resulting costs. However, such disc cutters usually have a diameter of from about 800 to 1100 mm with a width of cut of from about 25 to 50 mm, in Addition it turns out Srna tool and is caused by multiple processes division processed products.

Also known a method of making deep grooves in metal products, in particular in the rotors of the generators and turbines, which by means of milling tools speed wireservice each groove for several consecutive passages (patent GB 756113, 23 B C 3/28, 1956).

Also known milling tool in the form of a throwaway feature cutting blades disc milling cutters are designed for making deep grooves in metal products, containing the circular disc-shaped body with cavities for chip and tapes that have throwaway cutting plates and which in the area of the cavities for chip fixed exactly in position on the housing, with throwaway cutting plates have at least one main or rough edge, or at least one auxiliary cutting edge (patent US 3701187, B 26 D 1/00, 1972).

Object of the invention is the provision of assistance and path selection, which allows you to produce perfect grooves of the rotor with a small investment of time and tools.

This problem is solved in the method according to the invention due to the fact that the grooves wireservice in two passes, with each p is enta, which has cutting edges designed for roughing and finishing.

In the manufacture of stepped grooves for the first and/or second pass wireservice stepped profile grooves.

The solution to the above problem in the milling tool is due to the fact that throwaway cutting plates placed on the cassette can be divided width of cut by the main cutting edges of at least two sequentially adjacent in the direction of rotation of tapes with different sets of throwaway cutting plates, thus limiting the width of the cutting throwaway cutting plates at least one of these cassettes are adjacent to the main cutting edge axially directed outside of the auxiliary cutting edge, made in the form of the finishing cutting edge, and the main and auxiliary edges of these tapes are with the possibility of formation of a complete cutting edge, designed for roughing and finishing.

When this cassette is located on the housing radially flush in pastoobrazna deepening of the housing and with the possibility of relying on him is material relative to the body.

The tapes are installed on the housing in the axial direction flush with were made on the reverse side of the groove and included in the jumpers body.

From arranged in series one behind the other on the body of the cartridges one cartridge is located in the middle of the width of the cutting throwaway cutting plate or group throwaway inserts and at least another cassette has a pair of spaced axially symmetrically throwaway cutting plates.

At least the average throwaway cutting vinyl or group throwaway cutting plates one cassette is oriented tangentially relative to the circumference of the body vmontirovana position.

Throwaway cutting plates of the other cassettes are oriented tangentially relative to the body position and the area of the axially located outside of the narrow sides have an auxiliary cutting edges.

Both are located tangentially throwaway cutting plates respectively mounted with a negative axial rake angle.

Both end deprecative.

The milling tool is provided with at least one additional pair of spaced axially symmetrically cutting plates, placed on at least one of these two cassettes on the radial distance from the main cutting edge or main cutting edges another throwaway cutting plates or throwaway cutting plates.

An extra pair of throwaway cutting plates has a main cutting edges set at an angle in terms of more 0opreferably an angle of 30oand is intended for the manufacture of two chamfers.

An extra pair of throwaway cutting plates located on the side of the auxiliary cutting edges is located in the radial vmontirovana position.

Machining the lateral surface of the groove throwaway cutting plates made with the adjacent auxiliary cutting edge radius, which enters the main cutting edge.

Machining the lateral surface of the groove throwaway cutting plates have on the rear surface of the auxiliary cutting edge adjacent to the last area with the rear angle, which is 0oor s.

For widespread grooves of the rotor with two levels of slightly different width according to the height of the groove and adjacent to the bottom of the groove is narrower channel cooling in this way only two different instruments. In the first pass, the first step at the same time rough and milled on the side walls of the groove completely; in the following this second pass together the second step, and forming a channel for cooling the third stage, i.e., all stepped profile of the groove at the same time handled the rough and clean.

Now for making the entire groove uses only two different instrument, compared with the first described prior art is significantly less processing time by reducing the number of passes to only two, the main time saving and reduction of productive time, as a consequence of reducing the number of tool changes and processes division. Besides, the new method always fully work both disk milling cutter feed direction, so that formed between adjacent grooves of the rotor relatively thin bridge (teeth) can cause oscillations, which would lead to measurement inaccuracies and poor surface quality. Prov.domestic processing in contrast, is already free thin jumpers, experience creates associated with fluctuations and the size of the problem. To resolve difficulties would need to prop up jumpers using the introduced wedges.

Making grooves with partially V-shaped profile of the groove is carried out accordingly, the profile shape is taken into account by the relevant calculation tool. Additionally, the new method is also not limited to the manufacture of the slots of the rotor; he can always apply when it comes to how to make a very deep grooves with high surface quality at great length in metal processed products.

Both the above are equipped to implement the new method of a milling tool respectively made on the form include throwaway cutting blades disk milling cutter with a disc-shaped tool body, which is compared with the quality of the disk cutters of this type has a large and deeper grooves for chip forming during processing along the entire length of the arc of cut. This applies in particular to the above-mentioned second disc cutter for making the second and third stages of the profile groove.

By analogy with the known rototuna feature located in the nests of throwaway cutting blades and which in the area of the cavities for chip fixed exactly in position on the tool body.

The width of the cutting distributed along the main cutting edges throwaway cutting plates of at least two contiguously in the direction of rotation of tapes with different equipment throwaway cutting plates and in accordance with the invention, the composition is designed in such a way that limiting the width of the cutting throwaway cutting plates at least one of the cassettes are respectively adjacent to the main cutting edge directed axial outward of the auxiliary cutting edge, which is made in such a way that with the main and auxiliary cutting edges throwaway insert is formed blade roughing and finishing.

By replacing cassettes if necessary, you can change the width of cut and is created in the groove depth of the treads. Thus obtained consisting of standardized units system, which gives the advantage that the number of required different buildings of the tool is reduced to a minimum.

Cassette mounted on the tool body, respectively, with the advantage of radial geometric circuit in pastoobrazna deepening housing dedimania, and you can install with the end in pastoobrazna deepening contributes to the blocking effect.

To ensure a correct orientation of the cassettes on the tool body in the axial direction and thereby to avoid the need for expensive alignment activities, it is advantageous if the cartridge on the body of the tool is oriented in the axial direction flush with their backs penoobraznogo deepening and included in this deepening jumper the body of the instrument. Accurately fitting the running tape and the body of the instrument allows thereby to change tapes without additional adjustment and alignment work. Simultaneously, this embodiment of the tape and attaching them to allow any value for the deepening of chips in the body of the instrument, which, as already explained, are of great importance, especially in case of long chips. In a preferred embodiment of the cartridge on the body of the tool is fixed respectively with passing mainly tangentially to the tool body of the screw head, which is in contrast to conventional still the wedge saimn the The location and geometry of the cutting edges throwaway cutting plates are selected so that what is the balance of forces in the axial direction. This leads to a high accuracy of rotation of the cutter and thereby to a high surface quality at high measurement accuracy. Practically this is done because of contiguously on the body of the tool cartridges one cartridge, related to the width of cut is located in the middle of throwaway inserts or group throwaway insert, and at least another cassette is equipped arranged in pairs symmetrically to the axis throwaway cutting blades. When this is achieved the advantage, if at least average throwaway cutting plate (or group throwaway cutting plates) is oriented mainly tangentially to the circumference of the tool body vmontirovana position. This tangential installed position allows us to perceive a very high cutting forces and thus to achieve a correspondingly large volume cutting, in particular, is of great importance for rough milling or roughing operations. Throwaway cutting plates of other cassettes can also be placed in they in their area axially located outside of the narrow sides have an auxiliary cutting edges, performing final machining of the side walls of the groove.

This tangential arrangement of the throwaway cutting plates whereas, in particular, to a milling tool for manufacturing first stage of the slots of the rotor. Auxiliary cutting edges end throwaway cutting records released. To do this, these throwaway cutting plates are installed with different from the 0oaxial main angle (5 to 10o).

In particular, for a milling tool for making the second and optionally the third stage of the slots of the rotor, the advantage is achieved when both end throwaway inserts are respectively oriented in a generally radial to the tool body vmontirovana position.

Thus can be achieved by the relatively large effective length of the auxiliary cutting edges, and the arrangement expediently designed in such a way that when using contiguously on the body of the tool cartridges one cartridge has a working side of the main cutting edges and the edges of the roughing and the subsequent cassette complement the throwaway cutting plates on the rear surface of the auxiliary cutting edges are adjacent to the auxiliary cutting edge area from the rear angle, which is smaller than that of the rear corner adjacent to the main surface throwaway cutting plate zone. Thanks to the so-called sedative-phase or zero phase on the rear surface is achieved soothing effect and thus the best rotation precision and high surface quality.

Finally, the advantage is achieved when manufacturing the lateral surface of the groove throwaway cutting plates made in accordance with the adjacent auxiliary cutting edge radius, so that due to the presence of certain auxiliary cutting edge gives a very good surface quality.

Other ways to perform these milling working bodies are subject to additional claims.

The drawing shows examples of the subject matter.

In Fig. 1 shows a cross-section and schematic representation of a typical generator rotor three-phase current;

in Fig. 2 is a cross-section of the groove of the rotor in accordance with Fig. 1 and in the other scale;

in Fig. 3 is a partially schematic view in perspective of a milling tool in the form of a disk milling cutter for making Voronovo tool in accordance with Fig. 3 with a visual display in the future equipped with two throwaway cutting blades, one after the other cassettes and a different scale;

in Fig. 5 is a corresponding image of the layout in accordance with Fig. 4, with the removed tapes;

in Fig. 6 is a side view of a milling tool in accordance with Fig. 4 a section along the line VI-VI in Fig. 4;

in Fig. 7 is an idealized view of the tool in accordance with Fig. 4 clearly show the side view of the cassette along the line VII-VII in Fig. 4, a radial top view of the previous cartridge and also a radial top view again the previous cassette;

in Fig. 8 - neckline, side view and projection parts end throwaway insert milling tool in accordance with Fig. 6;

in Fig. 9 is a schematic side view, cut in the other scale milling tool in accordance with the invention for the manufacture of the first stage of a groove of a rotor in accordance with Fig. 1;

in Fig. 10 - image in the context of a milling tool in accordance with Fig. 9 along the line IX-IX in Fig. 9 and

in Fig. 11 is a detailed top view of a milling tool in accordance with Fig. 9 clearly show two adjacent cassettes.

In Fig.bathrooms at the ends, not shown in the drawing, reference tails on one rotor forgings 1 cylindrically machined to a diameter of 2000 mm and has a total length, excluding bearings, up to about 20000 mm circumference, it is equipped with radially directed parallel to each other by the grooves of the rotor, in which deep grooves of the rotor 2 is designed to accommodate winding and wireservice according to the method in accordance with the invention. In General, the depth of these grooves of the rotor is about 160 to 220 mm with a width of about 25 to 50 mm Grooves of the rotor is limited mainly parallel side surfaces and cross-sections performed stepwise. Near the circumference of the rotor is made of a wall of the groove is approximately triangular in cross section so-called locking grooves 3, which are designed to accommodate not presented in detail locking plate elements, the so-called wedge. These locking grooves 3 for the invention of no interest; they are made in the process special process operations and further detail is not considered. As shown in Fig. 2, each of the grooves 2 of the rotor is starting from circle 4 of the rotor 1 of the first stage 5 pre-defined width, but inside is the third stage 7, which is clearly already serves in particular as a so-called groove cooling, while the first and second stages 5 or 6 are designed to accommodate the active sides of the coil winding. The total depth of a pair of approximately 220 mm shares approximately 60 mm for the first stage and 160 mm for the second and third steps.

The manufacture of these restrictive in separate steps of the parallel side surfaces of the grooves 2 of the rotor is made using disk cutters in two successive passes, which in the first pass the first stage 5 using only a single disk cutters simultaneously milled rough (treated rough) and located against each other, the side walls 8 of the groove is processed accurately (completely processed), then in the second pass when the thus treated first-stage 5 the second and third stages simultaneously milled rough (handled rough draft) and in the area located opposite each of the side walls 9 or 10 milled completely (completely processed). The bottom 11 of the groove should only be handled roughly.

Used to perform both of these passages disk milling cutter having the given disk cutter 12 for making the second and third stages 6, 7. The disk cutter 12, the diameter is in the range from about 800 to 1100 mm, has a disc-shaped body 13 of the tool, which is made with the indicated position of the wheel hub 14 and is evenly distributed around the circumference of the recess 15 for the chip, which in Fig. 3 shows only three. At the bottom of the canted to one side in position 16 of the recess 15 for the chip, respectively deepened located opposite the beveled surface perpendicular to, approximately rectangular in cross-section of the groove 17, the side wall which continues radially outward in the contact surface 18 having the form of a jumper continuation 19 of the body 13 of the tool. Each of the shaped jumper sequels 19 are located respectively between two adjacent recesses 15 for the chip and, as follows from Fig. 4, 5, is limited by two parallel side surfaces 20, the distance between which is selected in such a way that the continuation 19 is axially narrower than containing pastoobrazna recess 17 adjacent disc-shaped area of the body 13 of the tool. Each located symmetrically in the axial direction relative to the body 13 of the tool sequels 19 forms thus e.g. the mi cutting blades 22, 23 or 24, 25. Throwaway cutting plates 22-25 are every time in accordance executed nests exact position and the exact size, one of which is for throwaway cutting plate 22 is indicated in Fig. 4 position 27. Throwaway cutting plates secured to the respective cassette 21 by means of fixing screws 26.

Each of the cassettes 21 facing away from throwaway cutting plates 22, 23 or 25 reverse side feature passing through the radial height of one of the shaped jumper sequels 19 groove 29, which is located symmetrically with respect to the cassette 21 and limited parallel side surfaces. How, in particular, can be seen from Fig. 4, 5, each cassette with its groove 29 mounted on shaped jumpers continued 19, and its lower extended end part 30, which is coaxial with the adjacent parts of the tool body, inserted with tight tolerances in the corresponding pastoobrazna the recess 17. For fixing the inserted thus the cassette 21 on the body 13 of the tool respectively passing through the cylindrical screw head 31, which is screwed into the corresponding threaded hole 32 in the definition of the body 13 of the tool, and it, as shown in Fig. 5, slightly tilted radially inward relative to the direction of the circumference. This ensures that when tightening the cylindrical screw head 31, the cassette 21 by the bottom of the groove 29, in the first place, pressed against the mounting surface 18 to 19 continuation and, second, radially inward to the bottom penoobraznogo recesses 17 and adjacent to these surfaces. Thus each cassette 21 rests flush in the axial and in the radial direction of the body 13 of the tool, and pastoobrazna recess 17 prevents tilting of the cassette 21.

The recess 15 for chips made by comparison with a comparable disk cutters large. Their throat opening on the circumference of the body 13 of the tool, measured in the direction of the circumference corresponds to approximately measured in the direction of the circumference length of the respectively adjacent cassettes 21 and its paired continued 19. The radial depth of the grooves for chip a little more depth pass the third stage 7 milled groove 2.

In Fig. 3-7 shows that the body 13 of the tool equipped, respectively, following each other cassettes 21 with various complex is in the area of its circle feature located symmetrically with respect to its mid-plane square throwaway cutting plate 24 (Fig. 7), which is located in the tangential vmontirovana position and the main cutting edge which is indicated in Fig. 7 position 33. Throwaway cutting plates 24 are negative geometry of the cutting edge and have the shape of a parallelepiped.

Another marked position 21b cassette pairs come in the area of its circumference two rectangular in the top view throwaway cutting blades 22, working on the circumference of the effective main cutting edges which are marked in Fig. 6 position 35. Both throwaway cutting plates 22 are located mainly in the radial vmontirovana position and have respective auxiliary cutting edge or cutting edge finishing 36, which is adjacent to the main cutting edge 35 along the radius 37 (Fig. 8).

Both throwaway cutting plates 22 have the shape of a truncated pyramid and work with positive geometry of the cutting edge. They are, as shown in Fig. 7, mounted with different from the 0oaxial main angle 38 (about 5 to 10oso that their effective auxiliary cutting edges 36 in the direction of rotation ahead inside inefficient auxiliary C 24 and the main cutting edges 35 both ends throwaway cutting plates 22 are overlapped, so together with auxiliary cutting edges 36 is obtained a continuous across the width of the cutting edge roughing and finishing, which when used produces the third step with precisely machined (completely processed) side walls 10 of the groove.

In order to achieve a soothing effect and thus the best running accuracy and higher quality surface on the side walls 10 (Fig. 2) end-of throwaway cutting plates 22 in the area of the rear surface 39 adopted from Fig. 8 way after the auxiliary cutting edge 36 is made with the so-called soothing phase or zero phase, in which the rear angle is 0o, while he is in the adjacent area has a value from about 2 to 5o.

On the radial distance from both throwaway cutting plates 22 cassette 21b has two arranged symmetrically relative to the Central plane square throwaway cutting blades 23, axially arranged outside the main cutting edges 42 which protrude axially beyond the auxiliary cutting edges 36 of the end throwaway cutting plates 22 and to chiweenie cutting plates 23 are located under the main angle of about 30omainly in the radial vmontirovana position so that they are located outside the effective vertex of the cutting edges displaced radially around the circumference relative to the inside inefficient peaks of the cutting edges.

Beveled throwaway cutting plates 23 correspond in the tape cassette 21a pair of two rectangular throwaway cutting plates 25, which are made in accordance with the throwaway cutting blades 22 and the main cutting edge 35 and the cutting edge on the adjacent radius 37 perform rough machining, as well as through effective auxiliary cutting edges 36 on both sides do the final machining of the side walls 9 of the groove of the second stage 6 of the groove 2 of the rotor (Fig. 2). In relation to education, the rear surface is true all of the above in connection with Fig. 8.

As throwaway cutting plates 24, 22 or 23, 25 are respectively in the middle or in pairs symmetrically relative to the Central plane of the body 13 of the tool is obtained axial balancing acting when processing on the effective cutting edges of the forces. When a high accuracy of rotation of the tool this leads to the fact that VO2">

Used for the manufacture of the first stage 5 of the groove 2 of the rotor tool in the form of a disk milling cutter 43 is made, as already mentioned, in principle, by analogy with the disk cutter 12 in accordance with the natural 3, so enough of Fig. 9-11 represent only significant for understanding part of the disk milling cutter and explain only the characteristics that are different.

Having the form of a disc case 130 of the tool is also equipped with hub 140 and executed with evenly spaced around the circumference of the recesses 150 chip, which is also limited located obliquely curved surface 160 for chip and at the bottom of which is provided pastoobrazna the recess 170. Narrower in the axial direction is limited parallel side surfaces continue 190 between adjacent recesses 150 chip have cassettes 210, which on the reverse side is equipped with radially passing, limited parallel side surfaces of the groove 290 (Fig. 11), which is based on the appropriate follow-190-shaped jumper (Fig. 11). The lower part 300 cassettes 210 acts razoobrazny recesses 170 in which they radially propped up with stability from tipping over while they are in n the principle is similar, as shown in Fig. 5, located cylindrical screw head 310 is designed appropriately for fastening on the body 130 of the tool.

Fastening tapes 210 flush on the housing 130 of the tool is the same as the fastening tapes 21 flush on the body 13 of the tool, so that both the disk cutter 12, 43 if necessary, you can do the same housing 13 (or 130) of the instrument.

When using disc cutters 43 following each other in the direction of the circumference of the cartridge 210 is also equipped with a respectively different set of throwaway cutting plates. Indicated by the position 210a cassette each cassette pair has a circumference square, located in the tangential vmontirovana position symmetrically relative to the Central plane of the housing 130 of the tool throwaway cutting plate 44, the effective main cutting edge which is marked with the position 45 (Fig. 11). The main cutting edge 45, similarly as the throwaway cutting plastics 33 in accordance with Fig. 7, is shorter than the cutting width. It works with negative geometry of the cutting edge (see Fig. 9). Its main axial angle of deprecatively two throwaway cutting blades 46, also in the tangential vmontirovana position are located symmetrically relative to the Central plane of the housing 130 of the tool. Their effective cutting edges 47 overlap the effective cutting edge 45 throwaway cutting plate 44 of the cassette 210a. They are built with different from the 0othe main angle 48 in such a manner that they are axially located outside the effective vertex of the cutting edges are lagging behind in the direction of rotation from inside inefficient peaks of the cutting edges.

Thereby axially located outside the auxiliary cutting edges or cutting edges 49 finishing throwaway cutting plates 46 released. Effective auxiliary cutting edges 49 are together with the main cutting edges 47 and 45 passing through the entire width of the cutting edge roughing and finishing, through which the first stage 5 of the groove 2 of the rotor (Fig. 2) at the same time rough and milled in the area of the side wall 9 of the groove is processed completely.

In the manufacture of the grooves 2 of the first rotor with a disk milling cutter 43 according to Fig. 9-11 in one pass milled first stage 5. With one process on ODI lateral surfaces 8 of the groove. The depth of the groove of the first stage 5 depends on the geometrical data of conditions. It is usually from about one third to one quarter of the total depth of the groove.

After tool change with the help of another disk cutter 12 in a single pass at the same time made the second stage 6 and the third stage 7 of the groove 2 of the rotor. While using throwaway cutting plates 22, 23, 24 (Fig. 6, 7) is performed roughing width of the third stage 7 to the bottom 11 of the groove, while the auxiliary cutting edges 36 throwaway insert 22 is processed completely, the side wall 10 of the groove of the third step.

In this process, radially located inside the throwaway cutting plates 25 perform in order to be more compared to the third step of the 7 width of the groove in the second stage 6 additional roughing operations, while the auxiliary cutting edges 36 throwaway cutting plates 25 are treated completely side wall 9 of the groove in the second stage 6. Throwaway cutting plates 23 are made of the chamfer at the transition from the third to the second stage of the groove 2.

The large sizes of the recesses 15 chip selected so th chips. Thus each groove 2 of the rotor is made only in two passes, i.e., using only two, besides that, in principle, similarly made, disk cutters to size with a perfect surface quality of the side walls of the groove.

1. A method of making deep grooves in metal products, in particular in the rotors of the generators and turbines, which by means of milling tools speed wireservice each groove for several consecutive passages, characterized in that the grooves wireservice in two passes, with each pass simultaneously perform roughing and finishing processing using a single milling tool that has a cutting edge designed for roughing and finishing.

2. The method according to p. 1, characterized in that in the manufacture of stepped grooves for the first and/or second pass wireservice stepped profile grooves.

3. Milling tool in the form of a throwaway feature cutting blades of the disk cutters for making deep grooves in metal products, containing the circular disc-shaped body with cavities for chip and tapes that have neferet the ri the throwaway cutting plates have at least one main or roughing cutting edge, or at least one axially directed outside of the auxiliary cutting edge, characterized in that throwaway cutting plates placed on the cassette can be divided width of cut by the main cutting edges of at least two sequentially adjacent in the direction of rotation of tapes with different sets of throwaway cutting plates, thus limiting the width of the cutting throwaway cutting plates at least one of these cassettes are adjacent to the main cutting edge axially directed outside of the auxiliary cutting edge, made in the form of the finishing cutting edge, moreover, the main and auxiliary edges of these tapes are with the possibility of formation of a complete cutting edge designed for roughing and finishing.

4. The instrument under item 3, characterized in that the cassettes are located on the body radially flush in pastoobrazna deepening of the housing and with the possibility of relying on him in the radial direction.

5. The instrument under item 3 or 4, characterized in that the cassette is fixed to the chassis using the screw located tangentially on the housing in the axial direction flush with were made on the reverse side of the groove and included in the jumpers body.

7. Instrument according to any one of paragraphs.3 to 6, characterized in that arranged in series one behind the other on the body of the cartridges one cartridge is located in the middle of the width of the cutting throwaway cutting plate or group throwaway cutting plates and at least another cassette has a pair of spaced axially symmetrically throwaway cutting plates.

8. The instrument under item 7, characterized in that at least the average throwaway cutting vinyl or group throwaway cutting plates one cassette is oriented tangentially relative to the circumference of the body vmontirovana position.

9. The instrument under item 8, characterized in that throwaway cutting plates of the other cassettes are oriented tangentially relative to the body position and the area of the axially located outside of the narrow sides have an auxiliary cutting edges.

10. The instrument under item 9, characterized in that both are located tangentially throwaway cutting plates respectively mounted with a negative axial rake angle.

11. The instrument under item 8, characterized in that the of orpus vmontirovana position.

12. Instrument according to any one of paragraphs.7 to 11, characterized in that it is provided with at least one additional pair of spaced axially symmetrically cutting plates, placed on at least one of these two cassettes on the radial distance from the main cutting edge or main cutting edges another throwaway cutting plates or throwaway cutting plates.

13. The instrument under item 12, characterized in that an extra pair of throwaway cutting plates has a main cutting edges set at an angle in terms of more 0opreferably an angle of 30oand is intended for the manufacture of two chamfers.

14. The instrument under item 12, characterized in that an extra pair of throwaway cutting plates located on the side of the auxiliary cutting edges is located in the radial vmontirovana position.

15. Instrument according to any one of paragraphs.3 to 14, characterized in that the holder side surfaces of the groove throwaway cutting plates made with the adjacent auxiliary cutting edge radius, which enters the main cutting edge.

16. Tool on p. 15, characterized in that gateley cutting edge adjacent to the last area with the rear angle, which is 0oor at least less rear angle adjacent to the main surface throwaway cutting plate zone.

 

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