EP3681659A1

EP3681659A1 - Threaded insert for securing a tool in a tool receiving area, and tool receiving area comprising such a threaded insert

Info

Publication number: EP3681659A1
Application number: EP18773359.7A
Authority: EP
Inventors: Franz Haimer
Original assignee: Franz Haimer Maschinenbau KG
Current assignee: Franz Haimer Maschinenbau KG
Priority date: 2017-09-14
Filing date: 2018-09-11
Publication date: 2020-07-22
Also published as: WO2019052982A1; JP2020533184A; CN111093869A; JP7280867B2; US20200276651A1; DE102017121363A1; US11358228B2; KR20200054234A; KR102546330B1

Abstract

The invention relates to a threaded insert (3) for securing a tool provided with a securing thread in a tool receiving area (1). The threaded insert (3) contains a receiving opening (16) with an inner thread (17) for screwing in the tool at the front end face (20). According to the invention, the threaded insert (3) has a plug-in region (13) which tapers towards the rear end face (26) and which comprises an outer support surface (14), and at least one depression (25) for receiving an adhesive is arranged on the outer contact surface (14). The invention additionally relates to a receiving element for such a threaded insert and to a tool receiving area comprising such a threaded insert and a corresponding receiving element.

Description

Threaded insert for attaching a tool in a tool holder and tool holder with a

such threaded insert

The invention relates to a threaded insert for fastening a provided with a fastening thread tool in a tool holder according to the preamble of claim 1. The invention also relates to a receiving body for such a threaded insert and a tool holder with such a threaded insert and associated receiving body.

From WO 2013/178401 AI a tool holder with a threaded insert for holding a tool provided with a fastening thread is known. To protect the thread and clamping with high concentricity of the threaded insert is arranged in a receiving body transversely to the longitudinal axis of the receiving body movable and secured by a transverse pin or a positive connection against rotation. In order to ensure the radial mobility of the threaded insert, appropriate design measures are required. The object of the invention is to provide a threaded insert, an associated receiving body and a Werkzeugaufhahme that allow a simple and accurate installation of the threaded insert in a corresponding Aufiiahmekörper even without complex design measures. This object is achieved by a threaded insert with the features of claim 1, by a Aufiiahmekörper with the features of claim 12 and by a Werkzeugaufhahme with the features of claim 16. Advantageous developments and advantageous embodiments of the invention are specified in the dependent claims.

The threaded insert according to the invention has a front end side for fastening a tool provided with a fastening thread Receiving opening with an internal thread for screwing the tool on. For attachment of the threaded insert in a receiving body of the threaded insert includes a tapered to a rear end insertion region with an outer bearing surface on which at least one recess for receiving an adhesive is arranged. The threaded insert can be inserted with an introduced into the recess adhesive in a receiving opening of a receiving body and can be held firmly and against rotation not only by a press fit between the receiving body and the threaded insert, but also by the additional adhesive connection. The threaded insert is so easy and accurate to install. If necessary, the adhesive connection can be solved for example by appropriate heating of the receiving body and the threaded insert or the receiving body can be replaced.

The use of an adhesive as a non-metallic substance between two metallic surfaces has several advantages in addition to the load-transferring effect, e.g. As vibration damping, sealing against liquids and gases, compensation for different component dynamics and corrosion protection. Thus, the use of an adhesive attached to the threaded insert by surface adhesion (adhesion) and its internal strength (cohesion) in the receiving opening of a receiving body, to distinguish fundamentally from the known, purely mechanical fastening method.

Adhesives are not or hardly used in machine tool construction and in particular in tool holders in the milling area. Due to the special design of the threaded insert and / or the receiving opening of a receiving body with recesses for receiving an adhesive but now a practically applicable solution is created for the first time. An acrylate-based adhesive, in particular urethane methacrylate, is preferably used.

In one possible embodiment, the insertion region has a conical outer contour. In an alternative embodiment, the insertion region of the threaded insert has a polygonal outer contour. Due to this non-circular shape, in addition to the positive connection and the contact force, an additional protection against unwanted rotational movement of the threaded insert. In a further embodiment, the holding force on the threaded insert is further improved by an additional attachment by force and / or positive engagement is provided. Thus, an additional external thread may be provided on the receiving opening of the on the ankle body facing the end of the threaded insert, which engages in a corresponding mating thread in the Aufnahmeöff tion of the receiving body.

It is expressly to emphasize that the threaded connection is only an additional attachment, that is a backup for the exceptional case. The essential attachment of the threaded insert is achieved by the press fit and in particular the adhesive connection.

As an alternative to an external thread of the threaded insert may have one or preferably a plurality of locking grooves which extend spirally around the, the receiving opening of the Aufhahmekörpers facing, side of the threaded insert. The locking groove begins at the rear end face and has an incline, which is particularly preferably at least 40 °. In this embodiment, the receiving body in its receiving area at least one, preferably a plurality of locking elements. The locking elements may be formed as one or more simple projections which engage positively in the locking grooves of the threaded insert, but particularly preferably they are helically formed in the circumferential direction protruding locking elements which are equiangularly spaced at the same height in the circumferential direction. It is also to be emphasized here explicitly that the use of a locking groove is merely an additional attachment, that is a backup for the exceptional case. The essential attachment of the threaded insert is achieved by the press fit and in particular by the adhesive connection. In a particularly expedient embodiment, a plurality of recesses distributed over the circumference can be arranged on the outer contact surface of the insertion region. The depressions may have the shape of a shallow groove. Preferably, the grooves are thin and have a maximum depth of 1.5 mm, better 0.5 mm. The depression or depressions can run parallel to the generatrix of the outer surface of the insertion region. But you can also run parallel to the circumference of the outer surface of the insertion or helically.

In another advantageous embodiment, the flat grooves extending transversely to the axis of rotation are designed as wider recesses, which means in this context that their width is at least three times as large as the width of the axially extending grooves.

Depending on the size, the threaded insert particularly preferably has four to six, in particular 5, grooves extending transversely to the axis of rotation, the width of which is chosen such that the webs remaining between the grooves have the substantially same width as the grooves. The same applies to the grooves in the receiving opening of the receiving body.

In your preferred embodiment, the depth of the grooves is at most 5/100 mm, more preferably not more than 3/100 mm. Ideally, in this case, the receiving opening of the receiving body has corresponding wider recesses. It is particularly provided that the recesses of the threaded insert and the receiving body come to rest on each other and thus create a special receiving space for the adhesive. In this embodiment, it is further provided that both the threaded insert and the receiving opening have at least five such transverse to the axis of rotation recesses.

It should be expressly pointed out for the sake of clarity that the various forms of the depressions can be combined with one another parallel to the surface line of the outer surface or parallel to the circumference of the outer surface of the insertion region.

In a further advantageous embodiment, the receiving opening between the tool-side front end face and the internal thread may include an outer bearing area with a first conical bearing surface and a second conical bearing surface. The first and second conical bearing surface of the outer bearing area preferably have significantly different cone angles. As a result, a support region with a double cone is created for the tool, which allows an enlarged support and an improved centering and supporting action in relation to a flat bearing or a straight contact surface. In a further advantageous embodiment, an inner support region with a plurality of circumferentially spaced apart and radially inwardly projecting, web-shaped support elements can be arranged on the threaded insert between an inner end of the receiving opening and the inner thread. Through this inner support area, the tool can be additionally centered and radially damped.

Conveniently, the threaded insert also contains a through hole through which a coolant or other working fluid can be passed to the tool or the processing area.

A designed for such a threaded insert receiving body of a tool holder according to the invention is characterized by a long and slender receiving area in which a to an input on a front end side of the receiving area towards expanding receiving opening for receiving the threaded insert is arranged.

To reinforce the long and slender receiving area and to damp the tool holder during a Zerspanvorgangs, there may be a core of a heavy and stable material, preferably made of heavy metal whose density is greater than that of steel. The core may e.g. be formed tubular and expediently has a central passageway. The core may be inserted into a slimmer middle part of a central passage opening of the receiving body. The core can rest completely on the sides of the central passage opening, or be held by enclosing damping elements in the central passage opening and spaced therefrom.

The invention also relates to a tool holder with a receiving body described above and an associated threaded insert. Appropriately, the receiving opening of the receiving body and the insertion of the threaded insert are adapted to each other so that in the mounting position of the threaded insert between the tool-side end of the receiving area and an annular surface on the threaded insert remains a distance. In order to facilitate the passage of coolant and / or lubricant from the central passageway formed in the core may be attached to the tool-side end of the passageway a sealing element which bridges the distance between the tool-side end of the receiving area and an annular surface on the threaded insert , This sealing element may be formed one or more channels depending on the configuration of the through-channel. In particular, it is provided that the sealing element protrudes into an opening formed in the threaded insert.

The seal preferably has a passageway which is coaxial with the passageway. As a result, the coolant or lubricant can be transported with particularly low friction. In a particularly advantageous embodiment, the diameter of the passage channel corresponds to the diameter of the supply channel, so that there is no cross-sectional enlargement in the channels and the coolant and / or lubricant can be transported without recirculation and Auskondensierung. In the influence on the pressure of the coolant and / or lubricant to take, the diameter of the threaded insert can also narrow in order to ensure a constant pressure on the coolant and / or lubricant through such a bottleneck.

The sealing element is preferably made of an elastic material, such as a highly elastic polyurethane elastomer product. Alternatively, any other deformable material is conceivable, for example aluminum, lead, copper, soft iron and the like. It is also possible to use memory material.

Such a sealing element may preferably also be provided in the receiving opening for the tool provided with a fastening thread in order to seal the passage of coolant and / or lubricant here as well.

Other features and advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawings. Show it:

1 shows a first embodiment of a tool holder with a threaded insert in a longitudinal section.

FIG. 2 is an enlarged partial view of the tool holder of FIG. 1; FIG. 3 shows a threaded insert in a perspective;

4 shows a second embodiment of a tool holder with a threaded insert in a longitudinal section.

5 shows the threaded insert shown in FIG. 4 in a perspective;

Fig. 6 shows another embodiment with vertical and horizontal recesses and locking grooves;

Figure 7 shows another embodiment with vertical and horizontal recesses and external thread.

Fig. 8 shows a further embodiment with inserted sealing element and

Fig. 9a, b, c detail views of various embodiments of the sealing element.

1 shows a tool holder 1 with a rotationally symmetrical Aumahmekörper 2 and a fixed in the receiving body 2 threaded insert 3 for holding a tool provided with a fastening thread. The receiving body 2 has a long and slender front receiving area 4 and a rear clamping area 5 arranged at the top in FIG. 1 for holding the receiving body in a work spindle of a machine tool. In the embodiment shown, the machine-side clamping region 5 as HSK interface with a conical outer clamping surface 6 for receiving in a corresponding inner cone of the work spindle of a machine tool or the like. Run. The interface at the rear end of the Aufhahmekörpers 2 can also be designed as SK, JIS, BT, ABS, Capto or other suitable interface.

As can be seen from FIG. 1, a core 9 made of a heavy and stable material, designed here as a tubular reinforcing and damping element with a central through-channel 8, is inserted in the narrow tapering region 4 of the receiving body 2 which conically tapers towards a tool-side end face 7. The one for reinforcement and Vibration damping of the long and slender receiving portion 4 serving core 9 is inserted into a slimmer middle part of a central through hole 10 of the receiving body 2. At the tool-side end of the receiving area 4, a conical receiving opening 12 for receiving the threaded insert 3, which widens toward an input 11 on the front end face 7 of the receiving area 4, is provided.

FIG. 2 shows particularly clearly that the threaded insert 3 contains a plug-in region 13 which is adapted to the receiving opening 12 of the receiving body 2 and which tapers towards a rear end side 26 facing the tool holder 1. The insertion region 13 has an outer contact surface 14. The threaded insert 3 also includes a front receiving portion 15 with a receiving opening 16 for attachment of a threaded tool. For this purpose, the receiving opening 16 has an internal thread 17. In the exemplary embodiment of FIG. 1, the insertion region 13 has a conical outer contour with a conical outer contact surface 14. The conical on ahmeöffnung 12 of the receiving body 2 and the insertion portion 13 of the threaded insert 3 are adapted to each other, that in the mounting position of the threaded insert 2 between the tool-side end face 7 of the receiving body 2 and an annular surface 18 at the transition from the insertion region 13 to the receiving region 15 of the threaded insert 3 a distance 19 remains. As a result, no axial bias between the receiving body 2 and the threaded insert 3 is generated.

Between a tool-side front end face 20 of the threaded insert 3 and the internal thread 7, the receiving opening 16 has an outer bearing area with a first conical bearing surface 21 and a second conical bearing surface 22 for the installation of corresponding guide surfaces on the tool. The conical bearing surfaces 21 and 22 have different cone angles. The first conical bearing surface 21 has for example a relatively large cone angle between 140 ° and 179 °, preferably 170 °, while the second conical bearing surface 22 a comparatively smaller cone angle between 1 ° and 90 °, preferably 10 °. A double cone of the type described has the advantage that the smaller cone angle allows good centering of the tool on the threaded insert 3 and the large cone angle an additional support and centering. The cone angle is to be understood as meaning the opening angle of the cone formed by the conical bearing surfaces 21 and 22. Between an inner end of Aufiiahmeöffiiung 16 and the internal thread 17, an inner bearing area with a plurality of circumferentially spaced, radially inwardly projecting, web-shaped Aufiageelementen 23 is provided. By this support elements 23, the tool is additionally centered and guided radially damped within the Aufiiahmeöffiiung 16. An example of the embodiment of the Aufiiahmeöffiiung 16 and the execution of an associated tool is described in DE 10 2015 112 079 AI. Its contents are referred to in their entirety. About a provided in the threaded insert 3 through hole 24 and the passage 8 in the core 9, a coolant or other working fluid can be passed to the tool.

It can be seen from FIG. 3 that a plurality of indentations 25 for receiving an adhesive are arranged on the conical outer surface 14 on the conical insertion region 13 of the threaded insert 3. Before inserting the threaded insert 3 in the Aufhahmekörper 2 so adhesive can be introduced into the recesses 25. As a result, the threaded insert 3 can be held firmly and against rotation not only by a press fit between the receiving body 2 and the threaded insert 3, but also by the additional adhesive connection. If necessary, the adhesive compound may be e.g. solved by appropriate heating of the Aufhahmekörpers 2 and so the threaded insert 3 or the Aufhahmekörper 2 are replaced. The recesses 25 may preferably extend parallel to the generatrices of the conical outer surface 14. In further embodiments, however, they may also form ring surfaces extending parallel to the circumference of the conical outer surface 14 or may have a helical course. Alternatively to an adhesive connection, the threaded insert 3 can also be soldered to the receiving body 2 or connected in a materially cohesive manner.

FIGS. 4 and 5 show a further exemplary embodiment of a tool holder 1 with a rotationally symmetrical receiving body 2 and a threaded insert 3 fastened in the receiving body 2 for holding a tool provided with a fastening thread. This embodiment differs from the previous embodiment in that there is a gap between the outside of the core 9 and the inner wall of the central through hole 10. About here annular damping elements 27 of the core 9 is held in the receiving body 2. As can be seen from FIG. 5, the insertion region 13 of the threaded insert 3 here has a polygonal outer contour. The Aufnahmeöff 12 in the receiving body 2 is adapted to the outer contour of the insertion portion 13 on the threaded insert 3 and accordingly has a polygonal inner contour.

FIG. 6 also shows depressions 28 running longitudinally of the axis of rotation and transverse to the axis of rotation. Ideally, in this case also the receiving region 4 of the receiving body 2 has correspondingly smaller recesses (not shown here). It is particularly provided that the horizontally extending recesses 28 of the threaded insert 3 and the receiving body 2 come to rest on each other and thus create a special receiving space for the adhesive. In this embodiment, it is further provided that both the threaded insert and the Aufnahmeöffhung have at least five such horizontally extending recesses 28.

Starting at the rear end face 26, a plurality of locking grooves 30 are formed in this exemplary embodiment.

The threaded insert 3 of Figure 7 is similar to that shown in Figure 6. In contrast, here, starting at the rear end face 26, an external thread 29 is formed, in the specific case is a trapezoidal thread, but it could also find a needle thread use.

FIG. 8 shows the tool holder 1 with receiving body 2 and threaded insert 3, which is essentially already known from FIG. 1. In addition, a sealing element 31, which is formed coaxially with the through-channel 8, is located between receiving body 2 and threaded insert 3. In this figure, both the passage 8 and the sealing element 31 are formed einkanalig. In a multi-channel passage 8 but also the sealing element 31 may be formed mehrkanalig.

FIGS. 9 a, 9 b, 9 c each show various possible embodiments of the sealing element 31. FIG. 9a shows a sealing element 31, the outer diameter of which widens on the side toward the threaded insert 3 in order to anchor itself there in an opening provided for this purpose. The sealing element 31 shown in FIG. 9b has, in addition to the enlargement of the outer diameter shown in FIG. 9a, an additionally enlarged outer diameter on the side facing the core 9. However, this additionally enlarged outer diameter does not engage in a recess, but acts as a kind of flange on the front side of the core 9.

Another embodiment of the sealing element 31 is shown in FIG. 9c. Here, the sealing element 31 is disc-shaped and lies with its end faces over the entire surface both on the core 9 and on the sealing element 31.

LIST OF REFERENCE NUMBERS

tool receiver

Aufhahmekörp he

threaded insert

reception area

clamping range

clamping surface

front

Through channel

core

Through opening

entrance

receiving opening

insertion

Conical outer surface

reception area

receiving opening

inner thread

ring surface

distance

Front end

First conical bearing surface

Second conical bearing surface

support elements

Through Hole

Deepening (vertical)

Rear end face

damping element

Depression (horizontal)

thread

locking groove

sealing element

Claims

claims

A threaded insert (3) for fastening a tool provided with a fastening thread in a tool holder (1), wherein the threaded insert (3) at a front end side (20) contains a receiving opening (16) with an internal thread (17) for screwing in the tool in that the threaded insert (3) has a plug-in region (13) tapering towards a rear end (26) with an outer contact surface (14) and at least one recess (25) for receiving an adhesive on the outer contact surface (14) is arranged.

Threaded insert (3) according to claim 1, characterized in that the insertion region (13) has a conical or polygonal outer contour.

Threaded insert (3) according to claim 1 or 2, characterized in that on the outer contact surface (14) of the insertion region (13) a plurality of circumferentially distributed vertically extending recesses (25) are arranged.

Threaded insert (3) according to one of claims 1 to 3, characterized in that the at least one recess (25) is formed in the form of a shallow groove.

Threaded insert (3) according to one of claims 1 to 4, characterized in that the at least one recess (25) has a maximum depth of 1.5 mm, preferably 0.5 mm.

Threaded insert (3) according to one of claims 1 to 5, characterized in that the at least one recess (25) extends parallel to the generatrix of the outer surface (14) of the insertion region (13).

Threaded insert (3) according to one of claims 1 to 6, characterized in that the at least one recess (25) extends parallel to the circumference of the outer surface (14) of the insertion region (13) or helically.

Threaded insert (3) according to one of claims 1 to 7, characterized in that the receiving opening (16) between the tool-side front end face (20) and the internal thread (7) an outer bearing area with a first conical bearing surface (21) and a second conical bearing surface (22).

9. threaded insert (3) according to claim 8, characterized in that the first conical bearing surface (21) and the second conical bearing surface (22) have different cone angles.

10. threaded insert (3) according to any one of claims 1 to 9, characterized in that between an inner end of the imme mouth (16) and the internal thread (7) an inner bearing area with a plurality of circumferentially spaced, radially inwardly projecting web-shaped support elements (23) is present.

11. threaded insert (3) according to one of claims 1 to 10, characterized in that it contains a through hole (24) for the supply of a working fluid.

12. threaded insert (3) according to one of claims 1 to 1 1, characterized in that the threaded insert (3) has an external thread (29) at its the receiving opening (16) facing away from the end.

13. threaded insert (3) according to one of claims 1 to 1 1, characterized in that the threaded insert (3) has a locking groove (30) at its end facing away from the receiving opening (16).

14. threaded insert (3) according to one of claims 1 to 13, characterized in that on the outer contact surface (14) of the insertion region (13) a plurality of circumferentially distributed horizontally extending recesses (25) are arranged.

15 receiving body (2) of a tool holder (1), characterized by a long and slender Aufhahmebereich (4), in which a to an input (11) on a front end side (7) of the receiving area (4) towards expanding receiving opening (12 ) is arranged for receiving a threaded insert (3).

16. receiving body (2) according to claim 15, characterized in that in the receiving area (4) a core (9) made of a heavy and stable material is arranged.

17. Aumahmekörper (2) according to claim 16, characterized in that the core (9) is tubular and has a central passageway (8).

18. receiving body (2) according to claim 16 or 17, characterized in that the core (9) in a slimmer middle part of a central passage opening (10) of the receiving body (2) is inserted.

19. Aumahmekörper (2) according to any one of claims 15 to 18, characterized in that the Aumahmekörper (2) has an internal thread at its lower end.

20. receiving body (2) according to any one of claims 15 to 18, characterized in that the threaded insert (3) has a blocking element at its lower end.

21. receiving body (2) according to any one of claims 15 to 20, characterized in that in the receiving opening (12) a plurality of circumferentially distributed horizontally extending recesses (25) are arranged.

22. tool holder (1) with a receiving body (2) according to any one of claims 12 to 15 and a threaded insert (3) according to one of claims 1 to 11.

23. Werkzeugaumahme (1) according to claim 22, characterized in that the receiving opening (12) of the receiving body (2) and the insertion region (13) of the threaded insert (3) are adapted to each other so that in the mounting position of the threaded insert (3) between the tool-side end face (7) of the Aufhahmebereichs (4) and an annular surface (18) on the threaded insert (3) remains a distance (19).

24. Werkzeugaumahme (1) according to claim 22, characterized in that between the Aumahmekörper (2) and the threaded insert (3), a sealing element (31) is formed.

25. Tool room (1) according to claim 22, characterized in that recesses of the threaded insert (3) and the receiving body (2) come to rest on each other and thus create a special receiving space for the adhesive.