DE3148677A1 - DEVICE FOR DETACHABLE RADIAL AND AXIAL CLAMPING OF A TOOL OR WORKPIECE PROVIDED WITH A CENTER HOLE ON A SPIN OD. DGL. - Google Patents

Description

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solder

for releasable radial and axial clamping of a tool provided with a central bore or workpiece on a mandrel or the like.

The invention relates to a device according to the preamble of claim 1.

From DE-PS 7 ^ 3 530 a device is known in the case of a tool with a clamping sleeve that is elastically deformable under the variable pressure of a fluid or workpiece on a mandrel or the like. is attached, wherein the clamping sleeve or the like the annular space between the mandrel. and fills the tool or workpiece. That Clamping takes place only in the radial direction, clamping in the axial direction is not possible with this device possible.

It is also known 'tools, e.g. shaving wheels for the Fine machining of gears, to be taken up directly on a mandrel, with the centering inevitable is prone to play. Tensioning takes place in the axial direction by means of a mechanical or hydraulic one Nut against a collar or another fixed stop on the mandrel (DE-GBM? 6 l6 4o6). A The disadvantage of these solutions is that the tool clamped on the mandrel, e.g. a shaving wheel, is very precise despite the fact that it is Manufacturing and compliance with the lowest possible manufacturing

; tolerances a no longer permissible runout error

can have, for example by adding the on

j tent tolerances of mandrel, adapter sleeve and tool.

The invention is therefore based on the object of centering a device for the most exact possible, backlash-free centering

the clamping of a high-precision tool or a workpiece to be machined with high precision on one

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Mandrel or the like. to create in which the radial and the axial tensioning is effected by a single element so as not to be additional due to the interaction of two elements Cause inaccuracies.

To achieve the object, a device is proposed which has the features of claim 1. The adapter sleeve designed in this way is on the mandrel or the like. unscrewed until the contact surface of the nut section comes to rest on the tool or workpiece. The sleeve section lies in the annular space between the mandrel or the like. and the tool or workpiece. By changing the pressure of the fluid, the tool or workpiece is then clamped radially and axially. For axial clamping one ring-shaped chambers are provided in the nut part and two ring-shaped chambers for receiving the fluid are provided in the sleeve part for radial clamping. For this purpose, advantageous embodiments are given in claims and 3. Instead of the ring-shaped chambers, a plurality of chambers evenly distributed in the circumferential direction can also be provided, for which various useful configurations are specified in claims 5 to 8. In all versions, each chamber can be acted upon separately, which enables the position of the clamped tool or workpiece to be changed sensitively. The effort for the pressure regulating devices can be reduced if the annular chambers (claim k) or if the respective radially adjacent chambers (claims 9 and 10) are acted upon jointly, which is sufficient for many applications.

The invention is described below on the basis of exemplary embodiments which are shown in FIGS. 1 to 5. Show it
FIGS. 1 and 2 show a longitudinal section and a cross section

along the line II-II by a device according to the invention,

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3 and 4 show a longitudinal and a cross section along the line IV-IV through another Execution of a device according to the invention,

5 shows a possible embodiment for the assembly the adapter sleeve consists of several parts.

A tool 30, for example a shaving wheel or a workpiece, is fastened to a mandrel 10 (FIGS. 1 and 3), which is only shown in part, by means of a clamping sleeve 20. The clamping sleeve 20 has a nut section 21 screwed onto a thread 11 of the mandrel 10 and a sleeve section 22 adjoining it. The inner jacket surface 23 of the sleeve section 22 encloses a cylindrical section 12 of the mandrel 10 and is enclosed on its outer jacket surface 24 by the bore wall 31 of the tool 30. A plane side 32 of the tool 30 is, optionally via an interposed disc 55 & ι n a collar 13 of the mandrel 10 at. A contact surface 25 of the nut section 21 rests on the other flat side 33 of the tool 3, possibly via an interposed washer 56.

The clamping sleeve 20 is in its sleeve section 22 with a first closed annular chamber 4l (Fig. * 1 and 2) and a second closed annular chamber 42 surrounding it. (The term "closed" is to be understood here and in the following in such a way that the chambers are delimited on all sides by the clamping sleeve 2 and does not rule out the presence of connected lines, which will be discussed below.) The chamber 4l has a small radial distance 43 to the inner one Jacket surface 23, the chamber 42 has a small radial distance 44 from the outer jacket surface 24. Around the sleeve section 22 to impart the necessary inherent stability

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hen is the radial distance 45 between the first 4l and the second chamber 42 greater than the radial distance 43 and 44, respectively.

In its nut section 21, the clamping sleeve 20 is provided with a third closed annular chamber 46, which has a small axial distance 47 from the contact surface 25.

The chambers 41, 42 and 46 are filled with a fluid. By means of a pressure screw 60, the pressure in the Chambers are varied, which are for this purpose via lines 64 with the pressure screw 6θ in connection. Following a threaded portion 6l has the Pressure screw 6θ on a cylindrical shaft 62 with a sealing ring 63. After the clamping sleeve 20 so is screwed far on the thread 11, that the contact surface 25 on the flat side 33 and the flat side 32 have come to rest loosely on the collar 13, the tool is clamped with the pressure screw 60. The further it is screwed in, the more the pressure in the chambers increases and the stronger they become abutting surfaces 23, 12; 24.31; 32.13; 33.25 clamped together as a result of the elastic deformation of the clamping sleeve. A pressure indicator is used to give the fitter an indication of the prevailing pressure 70 is provided, which is connected to the lines 64 via a line 71. Against the force of a spring 72 a sealed piston 73 is moved, on which a pin 74 emerging from the clamping sleeve 20 with a Line marking 75 is attached. The number (or color) of strokes indicates the pressure.

It has been shown in practice that a common pressure screw 60 for all chambers 4l, 42,46 in many Cases is sufficient. However, it is sometimes advantageous, at least for the tensioning in the axial direction

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third chamber 46, but possibly also for each of the three chambers to provide its own pressure screw 6o, 60 ', ... and its own pressure indicator 70, 70', ..., as in Figure 2 is indicated. This design is particularly useful for axially wide tools with only narrow radial ones Contact surfaces such as those attached to hob cutters.

As a rule, however, it will be desirable to be able to align the tool in the radial direction in order to be able to Eliminate any concentricity errors in the clamped tool. The clamping sleeve 20 is then in their sleeve section 22 with the first in the circumferential direction evenly distributed closed chambers 48 (Fig. 3 and 4) and with a second, also in the circumferential direction evenly distributed chambers 49 provided, which extend predominantly in the axial and in the circumferential direction. The chambers 48 have a small radial distance 43 to inner jacket surface 23 and the second chambers 49 small radial distance 44 to the outer circumferential surface 24. The radial distance 45 between the first 48 and the second chamber 49 is again larger than the radial one Distance 43 and 44. In their nut section 21 is the clamping sleeve 20 is provided with third closed chambers 50 evenly distributed in the circumferential direction, which have a small axial distance 47 from the contact surface 25 and extend predominantly in the radial and circumferential directions.

The chambers 48, 49 and 50 are filled with a fluid, the pressure of which can be varied by means of pressure screws 60 described above. ^{If there is a separate pressure screw 60, 60 1} etc. for each individual chamber 48, 49 and 50, the runout error of the tool 30 can be compensated very sensitively. With the pressure prevailing in the first chambers 48, the clamping sleeve 20 is fastened on the mandrel 10, the pressure prevailing in the second chambers 49 is used for fastening

supply of the tool 30 on the adapter sleeve 10 and with the the pressure prevailing in the third chambers 50, the clamping takes place in the axial direction. Used during the concentricity test for example found that the tool

• 5 30 - based on Figure 4 - "raised" compared to the mandrel 10 must be, then you will increase the pressure in the chamber marked with 48 ·, if necessary also in that with 49 ', and at the same time the pressure in the chamber marked with 48 ", possibly also in the chamber marked with 49" reduce. U.Ui must be the pressure in the third chambers 50 can be temporarily lowered to account for the radial displacement of the tool 30 to enable.

In order to be able to clearly identify the chambers 48, 49 ι 50 to be acted upon to compensate for a radial run-out error with higher or lower pressure, just as many first 48 as second 49 and third 50 chambers are provided. A first chamber 48 and a second chamber 49 are each radially adjacent and a third chamber 50 is axially adjacent to these.

In many cases it is sufficient if a common chamber 48, 49 is used for each of the radially adjacent chambers Pressure screw 6o and a common pressure indicator 70 are provided. It is also possible instead of the axially acting chambers 50 an annular chamber 46, as described in connection with FIGS. 1 and 2. The radially adjacent chambers 48, 49 can then be connected to one another via a line which is shown in dashed lines in FIG. 3 and denoted by 65. One then when compensating one Run-out error analogous to the process described above Any decrease in pressure occurring in chamber 48 ″ is compensated for by the increase in pressure in chamber 48 ′.

In Figures 1 to 4, the clamping sleeve 20 is shown as a homogeneous part. For their manufacture there is

various possibilities. As a rule, it is made up of several parts in the corresponding chambers are milled and / or screwed in, assemble and weld pressure-tight. An example of this is in Figure 5 shows where the clamping sleeve is composed of four parts 51 to 5 ^. Other designs are of course also possible.

The invention is not limited to the illustrated and described exemplary embodiments. So can e.g. the pressure screws 6o, 60 '... and / or the pressure indicators 70, 70 '... can also be arranged axially instead of radially, the number of chambers is not limited to 4 each, etc.

List of terms

10 thorn

11 thread

12 cyl. section

13 Confederation

20 adapter sleeve

21 nut section

22 sleeve section

23 inner jacket surface

24 outer jacket surface

25 contact surface

Tool hole wall

) Plan page

60 pressure screw

61 thread

62 shaft

63 Seal

g_) management

70 Pressure gauge

71 management

72 spring

73 pistons

74 pen

75 line marking

41 first chamber

42 second chamber

kkl radial distance

third chamber axial distance ■ first chamber second chamber third chamber

53) 54>

part of

) Disc

Claims (1)

Machine and gear factory QmbH & Oo Cvsoesaober Str. SO, S MQnohen 4O . ΐ98ι Lfl / week 460.00 513 EXPECTATIONS 10 15th / 1 Vj Device for releasable radial and axial clamping of a tool or workpiece provided with a central bore on a mandrel or the like, with a radially elastically deformable clamping sleeve between the mandrel or the like under the externally variable pressure of a fluid. and the tool or workpiece and one axially next to the tool or workpiece on the mandrel or the like. screw-on, the tool or workpiece against a collar or the like. on the mandrel or the like. pressing nut, characterized in that the clamping sleeve is made in one piece with the nut to form a sleeve section (22) and a nut section (21) and the axial contact surface (25) of the nut section (21) is axially elastic under the externally variable pressure of a fluid is deformable. 2 »Device according to claim 1, characterized in that the nut section (21) has a closed annular chamber (46) for receiving the fluid at a small axial distance (47) from the contact surface (25). 3. Apparatus according to claim 1 or 2, characterized in that the sleeve portion (22) has two annular chambers (41,42) for receiving the fluid, of which the first (4l) at a small radial distance (43) from the inner lateral surface (23) and the second (42) is arranged at a small radial distance (44) from the outer jacket surface (24), the second chamber (42) being the first chamber (4l) and the radial distance (45) between the first (4l) and the second chamber (42) is greater is than the radial distance (43 or 44) of these chambers (4l or 42) to the inner or outer jacket surface (23 or 24). 4. Apparatus according to claim 2 or 3 » characterized in that the chambers (41,42,46) are fluidically connected to one another. 5. The device according to claim 1, characterized in that "that the sleeve section (22) and / or the nut section (21) each have a plurality of chambers that are uniformly distributed in the circumferential direction and can be acted upon independently of one another for receiving the fluid. 6. Apparatus according to claim 1 or 5> characterized by a. first chambers (48) evenly distributed in the circumferential direction at a small radial distance (43) from the inner jacket surface (-23) of the sleeve section (22) and b. second chambers (49) evenly distributed in the circumferential direction at a small radial distance (44) from the outer jacket surface (24) of the sleeve section (22), wherein c. the radial distance (45) between the first (48) and the second chambers (49) is greater than the radial distance (43 or 44) of these chambers (48 or 49) to the inner or outer lateral surface (23 or 24), and through d. third chambers (50) evenly distributed in the circumferential direction at a small axial distance (47) from the contact surface (25) of the nut section (21). -3- 7. Device according to claim 6, characterized in that the number of first (48), second (49) and third chambers (50) is the same. 8. The device according to claim 7, characterized in that in each case a first (48) and a second chamber (^ 9) in the sleeve section (22) lie radially one above the other and a third chamber (50) radially and axially offset to these in the nut section (2l ) is arranged. 9. Device according to claim 8, characterized in that the first (48) and second chambers (49) lying radially one above the other and, if applicable, the third chamber (50) arranged offset thereto are fluidically connected to one another * 10. Apparatus according to claim 6 or 9 » characterized in that instead of the third chambers (50) evenly distributed in the circumferential direction, a closed annular chamber (46) is provided.