EP2523775A2

EP2523775A2 - Method for machining bar or tube material or inserts for producing rotationally symmetrical workpieces

Info

Publication number: EP2523775A2
Application number: EP11705429A
Authority: EP
Inventors: Hubert JÄGER
Original assignee: Jager-Engineering GmbH
Current assignee: Jager-Engineering GmbH
Priority date: 2010-01-11
Filing date: 2011-01-07
Publication date: 2012-11-21
Anticipated expiration: 2031-01-07
Also published as: DE102010004341B4; WO2011083082A2; EP2523775B1; WO2011083082A3; DE102010004341A1

Abstract

The invention relates to a method for machining bar or tube material or inserts (10) for producing rotationally symmetrical workpieces (1, 1', 1'') comprising at least one axial contour section (2, 3, 4, 5, 6), by means of a grinding disc (20) comprising a cutoff disc section (21) and at least one profiling disc section (22, 23, 24) adapted to the axial contour section (2, 3, 4, 5,6 ) of the workpiece (1, 1', 1''). According to the invention, a coarse profiling of the workpiece (1, 1', 1'') is carried out in a machining step of the workpiece (1, 1', 1'') by means of the cutoff disc section (21), and in a subsequent machining step the contour of the contour section (2, 3, 4, 5, 6) is generated by means of the at least one profiling disc section (22, 23, 24).

Description

description

Process for processing rod or pipe material or inserts for producing rotationally symmetrical workpieces

The invention relates to a method for processing rod or pipe material or inserts for the production of rotationally symmetrical, at least one axial Konturab- cut having workpieces according to the preamble of claim 1. Furthermore, the invention relates to a grinding wheel for performing the method according to the invention.

Such a method is known from DE 103 48 410 AI, in which by a feed movement a cutting disc portion of the grinding wheel comes into engagement with a rod or tube material to produce an end face or stabs a previously machined workpiece. In another Bear ^¬ beitungsschritt a rotation axis of the bar or tube material by the cutting blade portion by a further feed movement, after reaching or at least mild fügig driving over a profile portion of the disc

Grinding wheel on the rod or tube material brought into engagement to produce the final shape of the workpiece.

A disadvantage of this known method, however, is that the production of the final shape of the workpiece, ie the contour by the profiling disc section of the grinding wheel in cases where the contour to be produced has large differences in level due to the required high material removal leads to short service lives or only low delivery speeds allowed, which in turn require long process times.

CONFIRMATION COPY The object of the invention is to provide a comparison with the known method improved method that allows in particular the production of contours with large differences in level with long service lives and at the same time short process times or cycle times. It is also an object to provide a grinding wheel for carrying out the method according to the invention.

The first object is achieved by a method having the features of patent claim 1.

The solution according to the invention provides that in a processing step of the workpiece by means of the cutting disk section a rough profiling of the workpiece is performed, and in a subsequent processing step by means of the at least one Profilierungsscheibenabschnitts the contour, in particular the final shape of the contour section is generated.

According to the invention thus takes over the cutting wheel section of the grinding wheel in terms of a roughing the majority of cutting power, which on the one hand a cycle time or process time shortening high cutting performance is possible, and on the other hand the Profilierungsscheibenabschnitt is relieved and thereby longer life can be achieved. The relief of the profiling disk section results from the fact that only one finishing of the previously roughly produced contour sections of the workpiece is required. This can be realized for rod or pipe processing as well as for machining inserts an effective high-speed or high-performance grinding process.

According to one embodiment of the invention, the coarse profiling tion performed as axial and / or radial lancing, whereby a high cutting performance can be achieved.

According to a development of the invention, it is particularly advantageous if the grinding wheel has a plurality of profiling disk sections which are respectively adapted to contour sections of the workpiece, the contours of the respective contour sections of the workpiece being produced in separate processing steps. This simplifies, for example, the production of a complicated final shape of a contour section of the workpiece, by this final shape being produced in several processing steps, for example by means of two profiling disk sections. A particularly advantageous series production of identical workpieces from a rod or tube material results according to an embodiment of the invention by

a) for producing a plurality of workpieces, the rod or pipe material is clamped on both sides in a working space, b) in a processing step, a rough profiling of a rod or pipe section is carried out by means of the cutting wheel section of the grinding wheel,

c) subsequently the machined rod or tube section is separated from the rod or tube material by means of the cutting disc section,

d) a further rough profiling and / or an end profiling corresponding to the contour of a contour section of the workpiece is carried out for producing a workpiece from the severed rod or tube section,

e) in further processing steps for producing a further workpiece from the unprocessed rod or tube material, a rough profiling by means of the cutting disc section and then by means of the at least one professional lierungsscheibenabschnitts the contour of the contour section is generated, and

f) for the production of further workpieces with the method step a) is continued.

Since both a rough profiling and a parting off or cutting off a machined rod or tube material with the same tool, namely with the cutting wheel section of the grinding wheel is performed in successive processing steps, only short delivery routes to

Performing the separation and roughing required, which shorten the cycle times or process times.

It is particularly advantageous if the end profiling of the method step d) and the processing steps according to method step e) are carried out simultaneously, resulting in a considerable shortening of the cycle times or the process times. In this case, it is preferably advantageous for adapting the coarse profiling to the contour of the contour section of the workpiece if a coarse profiling is carried out by means of the cutting disk section even before the final profiling.

In order to achieve the considerable shortening of the cycle times or the process times, according to an advantageous development of the invention, it is necessary to carry out the final profiling by means of a further grinding wheel. In this case, this further grinding wheel preferably has at least one profiling disk section corresponding to the contour of a contour section of the workpiece.

According to one embodiment of the invention, the grinding wheel on several Profilierungsscheibenabschnitte, with which in each case a contour of a contour section of the workpiece is generated. This makes it possible to create complicated contours with one and the same tool. According to a development of the invention, it is particularly advantageous to form the cutting wheel section of the grinding wheel as a roughing wheel.

The second object is achieved with the features of patent claim 11.

According to the invention, a grinding wheel for machining rod or pipe material or inserts for producing rotationally symmetrical workpieces having at least one axial contour section has a cutting disk section and at least one profiling disk section according to the invention.

In this case, the grinding wheel is preferably formed with a base body which has an annular abrasive coating in the circumferential region to form at least one profiling disk section, wherein the cutting disk section is exchangeably connected to the main body as a disk-shaped insert.

According to a development of the invention, an annular abrasive coating is arranged in the entire circumferential region of the cutting disk section or only in a partial region of the peripheral region of the cutting disk section.

Preferably, the abrasive coatings are formed as CBN or diamond coating. The invention will be described below in detail by means of embodiments with reference to the accompanying figures. Show it:

Figure 1 is a view of a workpiece produced by the erfindungsge ^¬ MAESSEN method

Figures 2 - 13 are schematic representations of the processing steps for the preparation of the workpiece according to

Figure 1 of rod material as an embodiment of the invention, and

FIGS. 14-19 show schematic illustrations of the processing steps for producing the workpiece according to FIG

Figure 1 from an insert as a further embodiment of the invention.

The rotationally symmetrical workpiece 1 according to the invention made from a rod material 10 according to FIG. 1 has an outer contour, which is composed of different contour sections 2 to 7. A middle section 7 of the workpiece 1 consists of an unprocessed rod section, to each of which a plurality of contour sections 2 to 6 join on both sides. One end forms a cylindrical contour section 2, which is closed by a dome-shaped contour section 3. The opposite end also shows several contour sections 4, 5 and 6. The contour section 4 forms the end face with a chamfer, the contour section 5 describes a cylindrical shape, on the lateral surface as a further contour section 6 rotates a groove.

In the following, the processing steps in the production of such a workpiece 1 with reference to the figures 2 to 13 explained.

In these figures 2 to 13 feeding and tensioning devices 40 and 41 of a device, not shown, is shown, with the bar material 10 is clamped on both sides. This device comprises a plurality of drives for driving the tensioning devices 40 and 41 as well as a grinding spindle carrying a grinding wheel 20 as well as another grinding wheel 30. In addition, a control device (not shown) for setting individual process parameters is present in order to run a fully automatic production process of the workpieces 1 as series production.

The grinding wheel 20 shown in FIGS. 2 to 13 has a plurality of profiling disk sections 22, 23 and 24 and a separating wheel section 21. Another grinding wheel 30 is also formed with a plurality of profiling disk sections 31 and 32. The Profilierungsscheibenabschnitte 22, 23 and 24 and the cutting wheel portion 21 of the grinding wheel 20 are formed on a common base body 25, wherein the Profilierungsscheibenabschnitte 22, 23 and 24 form a CBN coating or a diamond coating. The cutting wheel section 21 also has on its circumference a CBN coating or a diamond coating 21a. This cutting disc section 21 is mounted on the main body 25 to ensure easy replacement. In the same way, the further grinding wheel 30 is constructed, but without a cutting wheel section. FIGS. 2 to 13 show the continuous series production of the workpiece 1 shown in FIG. 1, in which the two ends with the contour sections 2 and 3 or 4, 5 and 6 are each produced in a separate production process. Therefore 2, a free end of the bar stock 10 with the contour sections 4 to 6 is taken up by the clamping device 41 in FIG. 2 and a second production process for producing the contour corresponding to the contour sections 2 and 3 of a workpiece designated below by the reference numeral 1 is started ,

The rod material 10 is driven in rotation and the cutting disc portion 21 is brought into engagement with the bar stock 10 with a feed movement in the direction of the arrow P, as shown in FIGS. 3 to 7, so as to gradually perform a radial piercing by means of the CBN or Diamond lining 21 a of the cutting disc section 21 perform. In the process, this cutting-off wheel section 21, as a roughing wheel, takes over a large part of the cutting power for coarse-profiling according to the contour of the contour sections 2 and 3 of the workpiece 1 'according to FIG. 1.

With the two processing steps according to Figures 3 and 4, the cylindrical contour of the contour section 2, which adjoins the unprocessed portion 7 of the workpiece 1 ^λ roughly profiled. With the subsequent processing step according to FIG. 5, the coarse profiling of the contour corresponding to the contour section 3 of the workpiece 1 according to FIG. 1 already begins, since in this processing step the bar material 10 has a smaller diameter compared to the processing steps according to FIGS and 4 is scrubbed (see Figure 6). In the processing step according to FIG. 6, a parting operation takes place, preferably with rotating rod material 10. In this case, an advancing movement takes place again in the direction of the arrow P (FIG. 1) until the cutting disc section 21 reaches the rotational axis 11 of the rod material 10, as shown in FIG. but without the profiling disc sections 22, 23 and 24 coming into engagement with the bar material 10. Subsequently, the rough profiling of the workpiece 1 ^{λ is continued} according to the contour corresponding to the contour section 3, in which the bar stock 10 is roughed to an even smaller diameter than the last rough profiling step according to FIG. 5, by a coarse profiling corresponding to the dome-shaped end of the contour section 3 to create.

According to FIG. 8, in a further production process, the profiling of the now free end of the bar stock 10 begins to produce the next workpiece 1 ^, more precisely the contour corresponding to the contour sections 4, 5 and 6 and at the same time the final shape of the contour sections 2 and 3 of FIG Clamping device 41 on one side clamped workpiece 1 by means of the further grinding wheel 30th

For this purpose, the clamping device 41 is moved axially to increase the distance to the clamping device 40 in order to create a working space for the further grinding wheel 30.

Simultaneously, the rough profiling of the workpiece 1 starts ^{Λ λ} by means of the cutting blade portion 21 by step-wise radial piercing loops to generate a contour of the section 5 corresponding coarse contour, as shown in FIGS. 8 and 9 With this roughing, a large part of the cutting power required to produce the rough contour according to the contour section 5 is taken over by the cutting wheel section 21 used as a roughing wheel.

With the radial piercing grinding shown in FIG. 9 by means of the cutting disk section 21, the further grinding wheel is simultaneously produced by means of the profiling disk section 31 30, a sizing of the scored peripheral surface to produce the final shape corresponding to the contour portion 2 of the workpiece 1 ^Λ performed. This finishing process is continued in the subsequent processing step according to FIG. 10, in which by means of the profiling disk section 32 of FIG

Grinding wheel 30, the dome-shaped end shape corresponding to the contour portion 3 of the workpiece 1 ^{Λ is} performed. With this processing step, the workpiece 1 ^{λ is} completed.

With the processing step according to FIG. 10, the production of the final shape of the previously roughly profiled contour section 5 of the workpiece 1 ^Λ begins. For this purpose, the end face and the associated edge of the free end of the rod material 10 for the production of the contour corresponding to the contour section 4 is first sized and profiled by means of the Profilierungsscheibenabschnitts 22 of the grinding wheel 20.

In the processing step according to FIG. 11, the further sizing disk 30 is moved back into its starting position and the production of the final shape of the workpiece 1 ^, 2 is continued. For this purpose, the cylindrical contour corresponding to the contour section 5 is profiled and finished in the final shape by means of the Profilierungsscheibenabschnitts 23 of the grinding wheel 20.

With a last processing step according to FIG. 12, the last contour according to the contour section 6 is generated by means of the profiling disk section 24, whereby the final shape of the contour defined by the contour sections 4, 5 and 6 is completed. With this last processing step, the finished workpiece 1 'is ejected from the clamping device 41. Since on the workpiece 1 ^{Λ Λ} still the section 7 opposite end must be profiled, is detected in accordance with Figure 13 of the clamping device 41 of the clamping device 40 projecting part of the portion 7 and the rod material 10 is pulled out of the clamping device 40 until a state is achieved in accordance with Figure 2, so that now in accordance with Figure 3 of the manufacturing process for profiling the workpiece 1 ^{λ λ} is repeated in accordance with the contour of sections 2 and 3. FIG. The manufacturing process of workpieces 1 with an unprocessed rod material is started with a processing step according to FIG. 8, in which first the rod material 10 is clamped on one side only in the tensioning device 40. In the embodiment described above, the

Coarse profiling by means of the blade section 21 by radial lancing. In addition, it is also possible to carry out this rough profiling by means of axial piercing grinding as well as by means of pendulum grinding.

The grinding wheels 20 and 30 described in the exemplary embodiment rotate as a roughing and finishing wheel on a common grinding spindle. If necessary, more than two such grinding wheels can be provided as different types of tools on a common grinding spindle.

Figures 14 to 19 show the processing steps for producing a workpiece 1 from an insert 10 instead of rod material. For this purpose, according to the exemplary embodiment according to FIGS. 2 to 13, a grinding wheel 20 with a cutting disk section 21 designed as a roughing disk and with profiling disk sections 22, 23 and 24. The difference to the grinding wheel 20 according to FIGS. 2 to 13 is merely that the diamond or CBN lining 21a of the cutting disk section 21a does not assume the entire width at the circumference of the cutting disk section 21, as in FIG Figures 14 to 19, only in a partial region of the peripheral region is formed such that the abrasive coating 21a can end face only in the direction of the insert 10 in contact with the same. With this roughing disc 21, the insert 10 is pre-machined or roughly profiled before the final shape of the workpiece 1 according to the first exemplary embodiment is produced in subsequent processing steps by finishing by means of the profiling disc sections 22, 23 and 24 of the grinding wheel 20.

FIGS. 14 to 19 show a feeding and tensioning device 40 of a device, not shown, with which the insert 10 is clamped on one side. This device comprises a plurality of drives to drive the tensioning device 40 as well as a grinding spindle which carries the grinding wheel 20 with the cutting wheel section 21 and the profiling disk sections 22, 23 and 24 as tools. In addition, a control device (not shown) for setting individual process parameters is present in order to run a fully automatic production process of the workpieces 1 as a series production.

The insert 10 is driven in rotation and brought the separating disc portion 21 with a feed movement in the direction of the axis of rotation 10 in engagement with the insert 10, as shown in Figures 15 and 16, so as stepwise a radial lancing grinding by means of the CBN or Diamond lining 21 a of the cutting disc section 21 perform. In the process, this cutting-off wheel section 21, as a roughing wheel, takes over a large part of the cutting power for rough profiling according to the contour of the contour section 5 of the workpiece 1 according to FIG. 1.

17 begins the production of the final shape of the previously roughly profiled contour portion 5 of the workpiece 1. For this purpose, first by means of the Profilierungsscheibenabschnitts 22 of the grinding wheel 20, the

Front side and the associated edge of the free end of the rod material 10 for the preparation of the contour corresponding to the contour section 4 sized and profiled. In the processing step according to FIG. 18, the production of the final shape of the workpiece 1 is continued. For this purpose, the cylindrical contour corresponding to the contour section 5 is profiled and finished in the final shape by means of the Profilierungsscheibenabschnitts 23 of the grinding wheel 20.

19, the last contour according to the contour section 6 is generated by means of the profiling disk section 24, whereby the final shape of the contour defined by the contour sections 4, 5 and 6 is completed.

As in the first described embodiment, it is also possible to perform the rough profiling according to FIGS. 15 and 16 by means of axial piercing loops as well as by means of pendulum grinding.

In the exemplary embodiments described, a cutting disk section 21 designed as a roughing wheel comes metallically. bonded CBN or diamond tools are used. For the profiling disk sections designed as a sizing disk, metallically bonded, galvanically bonded or ceramically bonded BCBN or diamond coatings or combinations thereof are used.

Reference sign list

1 workpiece

1 ^, workpiece

l ^{, x} workpiece

2 contour section of the workpiece 1, 1 ^λ , 1 ^,

3 contour section of the workpiece 1, 1 1

4 contour portion of the workpiece 1, l ^x , 1 ^{λ λ}

5 contour section of the workpiece 1, 1 ^λ , 1 ^{, λ}

6 contour section of the workpiece 1, 1, 1 ^,

7 unprocessed portion of the workpiece 1, 1

10 rod or tube material or insert

11 axis of rotation of the rod or tube material 10th

20 grinding wheel

21 cutting wheel section of the grinding wheel 20th

22 Profilierungsscheibenabschnitt the grinding wheel 20th

23 Profilierungsscheibenabschnitt der Schleifscheibe 20 24 Profilierungsscheibenabschnitt der Schleifscheibe 20

25 base body of the grinding wheel 20

30 more grinding wheels

31 Profilierungsscheibenabschnitt der Schleifscheibe 30 32 Profilierungsscheibenabschnitt der Schleifscheibe 30

40 feeding and tensioning device

41 Feeding and tensioning device

Claims

A method for processing bar or tube material (10) or inserts (10) for the production of rotationally symmetrical, at least one axial contour section (2, 3, 4, 5, 6), having workpieces (1, 1 ^1>) by means of a (a cutting disc portion 21) and at least one on the axial contour section (2, 3, 4, 5, 6) of the workpiece (1, 1 1 ^{, λ} ) adapted profiling disc section (22, 23, 24) having grinding wheel (20),

d a d u r c h e c e n c i n e s that

in a processing step of the workpiece (1, 1 1 ^Λ ) by means of the cutting disc section (21) a coarse profiling of the workpiece (1, 1 ^λ , 1 ^{λ Λ} ) is performed, and in a subsequent processing step by means of the at least one Profilierungsscheibenabschnitts (22, 23, 24) the contour of the contour section (2, 3, 4, 5, 6) is generated.

Method according to claim 1,

d a d u r c h e c e n c i n e s that

the coarse profiling is performed as axial and / or radial lancing grinding.

Method according to claim 1 or 2,

d a d u r c h e c e n c i n e s that

the grinding wheel (20) has a plurality of profiling sections (22, 23, 24) which are respectively adapted to contour sections (2, 3, 4, 5, 6) of the workpiece (1, 1 l), the contours of the respective contour sections (2 , 3, 4, 5, 6) of the workpiece (1, 1, 1 ^Λ ) in special th processing steps are generated.

Method according to one of the preceding claims, characterized in that a

a) for producing a plurality of workpieces (1, 1 1 ^{, λ} ) the rod or tube material (10) is clamped on both sides in a working space,

b) in a processing step, a rough profiling of a rod or pipe section by means of the cutting disc section (21) is performed,

c) subsequently separating the machined rod or tube section from the rod or tube material (10) by means of the cutting disc section (21),

d) for producing a workpiece (1, 1 1 ^{, Λ} ) from the severed rod or tube section, a further coarse profiling and / or an end profiling according to the contour of a contour section (2, 3, 4, 5, 6) of the workpiece (1, 1 ^Λ , 1 ^{, Λ} ),

e) in further processing steps for producing a further workpiece (1, 1 1 ^, ) from the unprocessed rod or tube material (10) coarse profiling by means of the cutting disc section (21) and then by means of at least one Profilierungsscheibenab- section (22, 23, 24 ) the contour of the contour section (2, 3, 4, 5, 6) is generated, and

f) for the production of further workpieces (1, 1 with the method step a) is continued.

Method according to claim 4,

d a d u r c h e c e n c i n e s that

the end profiling according to method step d) and the processing steps according to method step e) be carried out simultaneously.

6. The method according to claim 5,

d a d u r c h e c e n c i n e s that

before the final profiling a rough profiling by means of

Cutting disc section (21) is performed.

7. The method according to any one of claims 4 to 6,

d a d u r c h e c e n c i n e s that

the end profiling by means of another grinding wheel

(30).

8. The method according to claim 7,

d a d u r c h e c e n c i n e s that

the additional grinding wheel (30) least one of the Kon ^¬ structure of a contour portion (2, 3, 4, 5, 6) of the workpiece (1, ^1, 1) corresponding Profilierungsscheibenab- cut (31, 32). 9. The method according to claim 8,

d a d u r c h e c e n c i n e s that

the grinding wheel (30) has a plurality of profiling disk sections (31, 32) with which in each case a contour of a contour section (2, 3) of the workpiece (1, 1 1 ^{, Λ} ) is produced.

10. The method according to any one of the preceding claims,

d a d u r c h e c e n c i n e s that

the cutting wheel section (21) is designed as a roughing wheel.

11. grinding disc (20) for processing bar or

Pipe material (10) or inserts (10) for the production of rotationally symmetrical, at least one axial contour section (2, 3, 4, 5, 6) having workpieces (1, 1 in particular for carrying out the method according to one of claims 1 to 9,

d a d u r c h e c e n c i n e s that

a separating disk section (21) and at least one profiling disk section (22, 23, 24) are provided.

Grinding wheel (20) according to claim 10,

d a d u r c h e c e n c i n e s that

the grinding wheel (20) has a base body (25) which has an annular abrasive coating in the circumferential area to form at least one profiling disk section (22, 23, 24), the cutting wheel section (21) being exchangeable as disk-shaped insert exchangeable with the main body (25) connected is.

Grinding wheel according to claim 11,

d a d u r c h e c e n c i n e s that

in the entire peripheral region of the cutting disc section

(21) an annular abrasive coating (21 a) is arranged.

Grinding wheel according to claim 11,

d a d u r c h e c e n c i n e s that

in a partial region of the peripheral region of the cutting disc section (21) an annular abrasive coating (21 a) is arranged.

Grinding wheel according to claim 12, 13 or 14,

d a d u r c h e c e n c i n e s that

the abrasive coating (21a) is formed as a CBN or diamond coating.