Solid Pallet for Clamping Chucks

Abstract

The invention refers to a chuck pallet (1.3) with solid groove-sidewalls (2.3) for clamping chucks (1.1), whereby the x-y-references (2.5) of the chuck pallet (1.3) are allocated in the same plane (2.1) as the z-references (2.1) and the x-y-references (2.5) are also allocated at the solid groove-sidewalls (2.3). The solid groove-sidewalls (2.3) have thereby a tapered profile.

Claims

1. Chuck pallet with solid groove-sidewalls for clamping chucks characterized in that the x-y-references and z-references of the chuck pallet are allocated in the same plane and the x-y-references are also allocated at the solid groove-sidewalls, whereby the solid groove-sidewalls have a tapered profile, preferably the plane in which the x-y-references and z-references are allocated is the z-plane.

2. Chuck pallet with solid groove-sidewalls for clamping chucks according to claim 1, characterized in that the solid groove-sidewalls are tapered and have an inclination () to the z-axis which is lower than the inclination () of tapered x-y-reference surfaces of the corresponding chuck lugs to the z-axis.

3. Chuck pallet with solid groove-sidewalls for clamping chucks according to claim 2, characterized in that in clamped configuration of the chuck pallet with the chuck, the line contact from the x-y-reference surface of the chuck pallet with the x-y-reference surface of the corresponding chuck lug is expandable from line contact at the x-y-reference edges to a surface contact on the x-y-reference surface.

4. Chuck pallet with solid groove-sidewalls for clamping chucks according to claim 1, characterized in that each solid groove-sidewall contains one or more slots reducing therewith the width of the solid groove-sidewalls to at least one solid standing bar which defines therewith the x-y-reference surface and the x-y-reference edge of the solid groove-sidewall, preferably a solid groove-sidewall contains two solid standing bars with x-y-reference surfaces separated by one slot, most preferably the solid standing bars are symmetrically arranged on both sides of the groove.

5. Chuck pallet with solid groove-sidewalls for clamping chucks according to claim 4, characterized in that the slot contains a protector, preferably the protector is elastic, particularly made of rubber or rubberlike material, most preferably the protector is affixed to the chuck pallet by a screw connection.

6. Chuck pallet with solid groove-sidewalls for clamping chucks according to claim 5, characterized in that the protector is protruding beyond the x-y-reference surface of the solid standing bar towards the center of the groove, preferably the protector is also protruding beyond z-plane of the chuck pallet.

7. Chuck pallet with solid groove-sidewalls for clamping chucks according to claim 1, characterized in that the solid groove-sidewalls are made of non-sintered material, preferably the entire chuck pallet is made of non-sintered material.

8. Clamping system comprising a clamping chuck and a chuck pallet according to claim 1.

Description

[0020] The invention, preferred embodiments, as advantages and technical effects of the inventive chuck pallet will now be explained with reference to schematic figures.

[0021] The FIG. 1 shows a 3D-view of the clamping chuck 1.1 with a detachable connected draw sleeve 1.2 and a known pallet 1.3 for mounting of a workpiece or tool as disclosed in the cited document EP1741511 B1. The chuck 1.1 has a number of z-surface protrusions 1.4 forming the z-reference plane. The chuck has further four xy-lugs 1.5 in a cross. These lugs have tapered x-y-reference surfaces on both sides. The position of the pallet is determined in all (meaning xyz) directions in clamped position and without any play. The z-planes of the chuck and pallet are then in contact and the x-y-lugs 1.5 of the chuck are slightly pressed into the grooves of the pallet (not visible) leading to a contact as described further above.

[0022] The FIG. 2a shows a view of the lower side of the inventive chuck pallet 1.3. The lower side has a flat ground surface defining the z-plane respectively the z-reference 2.1. The z-plane 2.1 has grooves 2.2 with solid groove-sidewalls 2.3 on both sides which are preferably made of non-sintered material. Being solid, the groove-sidewalls 2.3 contain no slot behind the x-y-reference surfaces 2.4 respectively any slot extending parallel and behind the x-y-reference surface 2.4, as represented for instance by the elastic tongues disclosed for instance in the EP 255042B1. The x-y-reference surfaces 2.4 are allocated at the upper portion of the solid groove-sidewalls 2.3. The x-y-reference surfaces 2.4 cut through i.e. intersect the z-plane 2.1 and define the exact location of the x-y-reference edges 2.5. In a preferred embodiment of the invention also illustrated in the FIG. 2, the x-y-reference edges 2.5 can be protected from damages caused by rough positioning at clamping and other impacts or hits by an elastic protector 2.6 (e.g. made of rubber). That protector can be preferably placed in the middle of the groove 2.2 or at one side of the groove. In the first case the rubber protector divides the x-y-reference surface into two portions, forming therewith the solid standing bars 1.6 with their respective x-y-reference surface 2.4. By that, the width of each x-y-reference surface portion 2.4 is small leading to short x-y-reference edges 2.5. In clamped configuration, the short edge contact of the x-y-reference edges 2.5 can expand to small surface contact 4.2 of the x-y-reference surface 2.4. These short edge or small surface contact is advantageously, since it makes the chuck pallet less sensitive to dirt and particles, which affect known clamping system. As an effect of the present invention, the elastic surface expansion takes also place to absorb the manufacturing tolerances of the produced x-y-reference surfaces during the manufacturing of the inventive chuck pallet. Further advantageously, the elastic surface expansion absorbs also surface pressure at higher loads of the pallet, avoiding therewith to exceed the maximum allowed surface pressure.

[0023] The FIG. 2b illustrates the inventive chuck pallet 1.3 showed in FIG. 2a from another angle.

[0024] The FIG. 2c shows the invention with a chuck lug 1.5 in unclamped respectively clamped position. The tapered x-y-reference surfaces 3.1 of the chuck lugs 1.5 have a slightly larger tapered angle than the corresponding x-y-reference surfaces 2.4 of the groove 2.2 of the inventive chuck pallet 1.3. This leads to an edge contact in level of the z-plane 2.1. By that, the exact location of the edge is determined allowing manufacturing with the required very high accuracy. The edge respectively line contact can expand to a surface contact 4.2 (see lower illustration of FIG. 2c) according to the explanations given above.

[0025] The FIGS. 3 and 4 are enlarged views of the chuck lug 1.5 in clamped position. They show the difference in taper angles of the x-y-reference surfaces 3.1 of the chuck lug 1.5with the inclination angle and the x-y-reference surfaces 2.4 of the chuck pallet 1.3with the inclination angle in an exaggerated way to show the edge contact 4.1 in level with the z-plane.

[0026] The FIG. 4 shows to the left the edge respectively line contact 4.1occurring at lower press respectively at lower loads Fof the x-y-reference surfaces 2.4 of the solid groove sidewall 2.3 of the chuck pallet 1.3 with the corresponding x-y-reference surfaces 3.1 of the chuck lug 1.5. The sketch to the right shows on the other hand the situation where the edge contact 4.1 expanded to a surface contact 4.2 once higher press respectively at higher exerted loads F on the chuck system. The improvement of the invention compared to the state of the art is that the first contact or contact area always starts from the z-plane 2.1 as a line contact 4.1. By this, there is no tolerance chain away from the z-plane. This is a prerequisite for the ability to manufacture and measure an overdetermined coupling with such accurate tolerances that no jam or play appears. The contact with the well-defined x-y-reference edges 2.5 ensures the accurate positioning of the inventive chuck pallet 1.3 on a clamping chuck from the very beginning. This is also valid when an expansion to a surface contact 4.2 has taken place, since the edge or line contact 4.1 was the first contact during the clamping process and has the most effect on the final position of the chuck pallet in respect of the clamping chuck, ensuring therewith the enhance accuracy of the clamping position. This accuracy remains consequently also once higher surface pressure at the edge is exerted (see sketch to the right in FIG. 4).

[0027] The FIG. 5 shows a version where the rubber protectors 2.6 protrude above the z-plane 2.1. By that, the chuck pallet 1.3 could be placed on a table or in a magazine without risk for damaging the x-y-reference edges 2.5.

[0028] The invention refers to chuck pallet with solid groove-sidewalls for clamping chucks. The x-y-references and z-references of the chuck pallet are hereby allocated in the same plane. The x-y-references are also allocated at the solid groove-sidewalls, whereby the solid groove-sidewalls have a tapered profile. With solid is meant thatin circumferential directionthe groove-sidewalls do not contain any slot or other structural weak spot behind the x-y-reference surfaces.

[0029] In a preferred embodiment, the plane in which the x-y-references and z-references are allocated is the z-plane.

[0030] The inventive chuck pallet has hereby solid and tapered groove-sidewalls which have an inclination () to the z-axis of the pallet that is lower than the inclination () (to the z-axis) of the corresponding and also tapered x-y-reference surfaces of the chuck lugs in the corresponding clamping chuck.

[0031] According to the invention, in clamped configuration of the chuck pallet with the corresponding chuck, thefirst occurringline contact from the x-y-reference surfaces of the chuck pallet with the corresponding x-y-reference surfaces of the corresponding chuck lug on the chuck can expand fromthe initialline contact at the x-y-reference edges of the chuck pallet to a surface contact between the x-y-reference surface of the chuck lug and the x-y-reference surface of the chuck pallet.

[0032] In a further and preferred embodiment of the inventive chuck, the solid groove-sidewall can contain one or more slots. The solid groove-sidewall is therewith reducedfrom its maximal widthto at least one solid standing bar. The one or more of these solid standing bars define thereby the x-y-reference surface(s) and the x-y-reference edge(s) of the solid groove-sidewall. Preferably a solid groove-sidewall contains just one slot defining therewith two separate and solid standing bars with x-y-reference surfaces. Most preferably, the formed solid standing bars are symmetrically arranged on both sides of a groove.

[0033] In a preferred embodiment that slot contains a protector. The protector can be elastic, for instance made of rubber or rubberlike material. The protector can be affixed to the chuck pallet by a screw or another element. In a further embodiment of that protector, the protector is protruding beyond the x-y-reference surface of the solid standing bar(s) or solid groove-sidewall towards the center of the groove. Most preferably the protector is also protruding beyond the z-plane of the inventive chuck pallet.

[0034] In a further embodiment of the inventive chuck pallet, the solid groove-sidewalls are made of non-sintered material. Even the entire chuck pallet could be made of non-sintered material.

[0035] The invention includes obviously also clamping systems comprising the aforementioned inventive chuck pallet in all its variants and a (conventional) clamping chuck. This since the inventive chuck pallet can be sold on its own to be used with known and already installed clamping chucks as obviously in combination with a clamping chuck.

REFERENCES

[0036] 1.1 clamping chuck [0037] 1.2 draw sleeve [0038] 1.3 chuck pallet [0039] 1.4 z-surface protrusions of the chuck [0040] 1.5 chuck lugs, x-y-lugs [0041] 1.6 solid standing bar [0042] 2.1 z-plane, z-reference [0043] 2.2 groove [0044] 2.3 solid groove sidewalls [0045] 2.4 x-y-reference surfaces [0046] 2.5 x-y-reference edges [0047] 2.6 rubber protector [0048] 2.7 screw [0049] 3.1 tapered x-y-reference surfaces of chuck lugs 1.5 [0050] 4.1 line contact of x-y-reference surfaces 3.1 of chuck lugs 1.5 with x-y-reference surface 2.4 respectively x-y-reference edges 2.5 of chuck pallet 1.3 [0051] 4.2 surface contact of x-y-reference surfaces 3.1 of chuck lugs 1.5 with th x-y-reference surface 2.4 of chuck pallet 1.3 [0052] inclination of the tapered solid groove-sidewall 2.3 respectively x-y-reference surface 2.4 to the z-axis [0053] inclination of tapered x-y-reference surface 3.1 of the chuck lugs 1.5 to the z-axis