CN1357430A

CN1357430A - Cutting tool chuck

Info

Publication number: CN1357430A
Application number: CN 00135043
Authority: CN
Inventors: 托马斯·雷茨巴赫; 拉尔夫·克斯腾
Original assignee: Cleamping Tool Werke And Schenk & Co KG GmbH
Current assignee: Cleamping Tool Werke And Schenk & Co KG GmbH
Priority date: 2000-12-07
Filing date: 2000-12-07
Publication date: 2002-07-10

Abstract

The persent invention introduces a hot-press fitted cutter clamping chuck. The cutter clamping chuck has a chuck body to be fixed inside machine tool main shaft, and in the chuck body there are a central installing hole to hold the cutter handle and a buffering ring cavity around the installing hole or buffering cavities homogeneously distributed around the installing hole.

Description

Be used for the chuck of clamp-on tool

The present invention relates to a kind of chuck by the shrink fit clamp-on tool, have a collet body that can be fixed on the machine tool chief axis, formation one is used for the central installing hole of cutter handle of a knife to be clamped in this collet body.

This class chuck of known various different structure forms, they are used for handle of a knife, and for example bit sub or milling cutter shank are fixed in the main shaft of corresponding lathe.They are used for clamping small-sized cutter especially.

Be used for being made up of a collet body that is made of metal usually by the chuck commonly used of shrink fit clamp-on tool, it can be contained on the main shaft of used lathe, and has a central installing hole that is used for cutter handle of a knife to be clamped.Here the diameter of installing hole is determined in this wise, makes it be slightly less than the handle of a knife diameter.For the clamp-on tool collet body heats in the zone of installing hole at least, have big like this thermal expansion up to it, make the handle of a knife installing hole of can packing into.Installing hole dwindles again when then cooling off, and makes handle of a knife be fixed in the installing hole by interference fit or shrink fit.

Though this so-called thermal contraction chuck has obtained checking in practice.But because the hard clamping of handle of a knife extrusion effect may occur in use, it may cause the fracture of cutter whole hard alloy handle of a knife.

Therefore the objective of the invention is, form a kind of chuck that starts described this class in this wise, make when work, to prevent extrusion effect on the handle of a knife at least fully.

Solve by such method according to this task of the present invention, a buffering toroidal cavity that surrounds installing hole promptly is set on collet body, perhaps on collet body, distribute and do to such an extent that have a buffering cavity that staggers mutually and be provided with around installing hole.Make the clamping of handle of a knife become " soft " by be arranged on cavity in the installing hole zone by the present invention, consequently, can get rid of or prevent fully that in the prior art hard clamping owing to handle of a knife occurs, may cause " the universal joint effect " of cracking of cutter.

According to a kind of form of implementation imagination of the present invention, the buffering annular chamber is done the axial groove that circularizes, and it particularly can open towards the end face of collet body handle of a knife one side.If select around installing hole many buffering cavitys to be set, they can make axial hole or axial groove so, and they are suitable for opening towards the end face of collet body handle of a knife one side too, so they can easily process.Next open architecture that cushions annular chamber or buffering cavity provides such possibility, the suitable damping material of can in cavity, packing into, and for example metal or plastics, they have the elastic modelling quantity littler than the material of collet body.

According to another kind of form of implementation imagination of the present invention, the buffering annular chamber is open towards installing hole, and in the buffering annular chamber, pack into one with the contacted cushion collar of handle of a knife of cutter to be clamped, wherein the elastic modelling quantity of cushion collar is less than the elastic modelling quantity of collet body.Particularly cushion collar can be made up of aluminium, plastics or the like.Adopt the sort buffer cover or fill the buffering cavity front area of collet body is formed a kind of supporting, makes and can guarantee that cutter is clamped in the installing hole reliably with vibration-absorptive material.

Secondly in collet body, be provided with heavy the cutting in the stub area open towards installing hole, in the stub area of installing hole cutter one side and/or installing hole main shaft one side, can clearly determine pinch zones by these heavy cutting.

Consult dependent claims and with reference to the following explanation of accompanying drawing about other good structures of the present invention at embodiment.Expression in the drawings:

Fig. 1 looks by the vertical profile of a kind of form of implementation of the chuck with axial buffer hole of the present invention,

The front view of chuck among Fig. 2 Fig. 1,

Fig. 3 looks by the vertical profile with chuck of a buffering annular chamber that seals of the present invention,

Fig. 4 has one and looks towards the vertical profile of the chuck of the open buffering annular chamber in collet body cutter one side end face by of the present invention,

The chuck of the buffering annular chamber that having among Fig. 5 Fig. 4 filled up and

Fig. 6 is by the form of implementation with chuck of a cushion collar of the present invention.

In Fig. 1 and 2, look expression one by first kind of form of implementation passing through the chuck of shrink fit clamp-on tool of the present invention with vertical profile.Chuck comprises one by the firm material of a kind of shape-these are collet bodies 1 of steel-form, it has a central installing hole 2 in an one stub area, at installing hole 2 heating and the later cutter W of relevant with it expansion, for example the cylindrical knife shank of drill bit or milling cutter can insert in this installing hole, and chuck is in its another stub area place can be clamped in the main shaft that the rotation of a lathe drives with known method.

Be provided with many axial holes 4 by the present invention on collet body 1, they are provided with around being centered around installing hole 2 evenly distributedly, and open towards the end face 1a of collet body 1 cutter one side.Reach by these cushion holes 4, make collet body 1 deliquescing in clamping the zone, position, make the vibration that when work, occurs be inhibited.Can prevent thus in common chuck owing to the handle of a knife fracture that clamps firmly and associated universal joint effect occurs.

The cushion hole 4 that extends in the section axial zone of installing hole 2 also can be filled suitable damping material, the supporting that makes handle of a knife obtain adding thus.

Replace cushion hole 4 to be respectively equipped with a buffering annular chamber 3 when the form of implementation shown in Fig. 3 and 4, it surrounds installing hole 2 fully, and extends along the section axial zone of installing hole.Buffering cannelure 3 seals under the situation of the form of implementation of Fig. 3, and open cutter one side end face to collet body 1 under the situation of the form of implementation in Fig. 4.Open architecture provides such advantage, and the sort buffer annular chamber is easily manufactured on the one hand, can fill on the other hand to have the suitable damping material littler than the elasticity modulus of materials of collet body 1, as shown in Figure 5.

As shown in Figure 6, buffering cannelure 3 also can open to installing hole 2, the damping cover of at this moment must in buffering cannelure 3, packing into then, and it has enough rigidity on the one hand, so that enough cutter W that firmly clamps in the installing hole 2 of packing into also play damping action on the other hand.

In collet body 1, can be provided with in the stub area of installing hole 2 cutters, one side and/or main shaft one side towards open the sinking of installing hole at last and cut 6, so that clear and definite and definite pinch zones (see figure 3).

Claims

1. pass through the chuck of shrink fit clamp-on tool, has a collet body (1) that can be fixed on the machine tool chief axis, in collet body, do a central installing hole (2) that is used for cutter to be clamped (W) handle of a knife, it is characterized in that: in collet body (1), be provided with a buffering annular chamber (3) around installing hole (2), or in collet body (1), form around installing hole (2) buffering cavity (4) uniform all around and that stagger mutually and be provided with.

2. by the chuck of claim 1, it is characterized in that: buffering annular chamber (3) is made the ring shaped axial groove.

3. by the chuck of claim 1, it is characterized in that; The buffering cavity is made axial hole (4).

4. by the chuck of claim 1, it is characterized in that: the buffering cavity is made axial groove (5).

5. by each chuck of aforesaid right requirement, it is characterized in that: buffering annular chamber (3) or buffering cavity (4) extend along the section axial zone of installing hole (2).

6. by each chuck of aforesaid right requirement, it is characterized in that: buffering annular chamber (3) or buffering cavity (4) open towards cutter one side end face (1a) of collet body (1).

7. by each chuck of aforesaid right requirement, it is characterized in that: buffering annular chamber (3) or buffering cavity (4) are filled damping material (D).

8. by the chuck of claim 7, it is characterized in that: damping material (D) is metal or plastics.

9. by each chuck of aforesaid right requirement, it is characterized in that: buffering annular chamber (3) opens towards installing hole (2), in buffering annular chamber (3), pack into one with the contacted damping cover of handle of a knife (5) of cutter to be clamped (W), wherein the elastic modelling quantity of damping cover (5) is less than the elastic modelling quantity of collet body (1).

10. by the chuck of claim 8, it is characterized in that: damping cover (5) is made up of aluminium, plastics or steel.

11. each the chuck by claim 1 to 8 is characterized in that: the stub area place of the stub area place of cutter one side of installing hole (2) and/or main shaft one side is provided with towards open the sinking of installing hole (2) and cuts (6) collet body (1) in.