WO2020182245A2

WO2020182245A2 - Tool holder and cutting tool comprising a tool holder

Info

Publication number: WO2020182245A2
Application number: PCT/DE2020/000057
Authority: WO
Inventors: Thilo NIETZSCHMANN
Original assignee: Gühring KG
Priority date: 2019-03-14
Filing date: 2020-03-16
Publication date: 2020-09-17
Also published as: DE102019203481A1; WO2020182245A3

Abstract

The invention relates to a tool holder (2) for holding a cutting insert (4), in particular a cutting plate, comprising a holder body (6) which has an inner holder body channel (8) and comprising a nozzle body (10) which is secured to the holder body (8) and has a nozzle body channel (12) connected to the holder body channel (8) and an outlet nozzle (14) adjoining the nozzle body channel (12), wherein the nozzle body (10) is inserted into the holder body (8) in a geometrically accurate manner with a precise fit. The invention additionally relates to a cutting tool (16) comprising such a tool holder (2) and a cutting insert (4) held on the tool holder (2).

Description

Tool holder and cutting tool with tool holder

description

The invention relates to a tool holder for holding a cutting insert, having a holder body which has an internal holder body channel and a nozzle body fixed to the holder body which has a nozzle body channel connected to the holder body channel and an outlet nozzle connected to the nozzle body channel. The invention also relates to a cutting tool with such a tool holder and a cutting insert held on the tool holder.

Tool holders are already included from the prior art

Known cooling lubricant channels. For example, EP 0 791 420 A1 discloses a cutting tool with a tool holder that has a holder body with a

Has cooling lubricant channel and a laterally attached to the holder body plate with cooling lubricant outlet nozzles. The coolant is thereby through the

Cooling lubricant channel is fed to a recess in the plate arranged on the outside of the tool holder and from there passed via the cooling lubricant outlet nozzles to a cutting edge of a cutting insert held in the tool holder.

However, the prior art has the disadvantage that the plate arranged on the tool holder is large and bulky and protrudes from the tool holder, as a result of which chips produced during workpiece machining can get stuck. Other cooling lubricant outlet nozzles known from the prior art are relatively expensive.

It is therefore the object of the invention to avoid or at least reduce the disadvantages of the prior art. In particular, a tool holder with an internal cooling lubricant supply and a cutting tool with such a tool holder are to be provided, with which an efficient cooling lubricant supply can be achieved through a functional, slim and compact design

Confirmation copy Can ensure the cutting insert held on the tool holder In addition, the tool holder should be simple and inexpensive to manufacture.

The object of the invention is achieved by a tool holder with the features according to patent claim 1 and by a cutting tool with the features according to patent claim 12. Advantageous and preferred developments

Embodiments are the subject of the subclaims.

According to the invention, a tool holder for holding a

Cutting insert, in particular a cutting insert, proposed. Of the

The tool holder has a holder body with an internal holder body channel that carries cooling lubricant. In other words, it extends

Holder body channel through the holder body so that a cross section of the

Holder body channel is completely surrounded or enclosed by the material of the holder body. The tool holder has a fixed on the holder body

Nozzle body on. In other words, the nozzle body is formed separately from the holder body and attached to it. The nozzle body has a nozzle body channel connected to the holder body channel and an outlet nozzle connected to the main body channel, preferably directly adjoining the nozzle body channel. A cooling lubricant channel leading to a cutting insert arranged on the holder body is thus passed through the holder body channel and

Formed nozzle body channel. In other words, the cooling lubricant channel is formed in sections by the holder body and in sections by the nozzle body. In a tool holder according to the invention, the nozzle body is integrated or inserted into the holder body with a precise shape and fit. That means that the

Nozzle body, for example, in a pocket-like recess or

Receiving recess is fitted in the holder body. In this state, the holder body and the nozzle body form a functional, slim and compactly constructed, handleable tool holder, which can be handled integrally.

The nozzle body does not form a disruptive body for the chip evacuation due to the precisely shaped and precisely fitting insertion into the holder body. In addition, a clear positional positioning of the nozzle body on the holder body, for example by a Form-fitting of the nozzle body in the mentioned pocket-like recess or receiving recess with the holder body, a desired alignment of the

Outlet nozzle e.g. on a cutting edge of a held on the tool holder

Reach cutting insert.

In a preferred embodiment, the nozzle body channel can be non-linear, i. not straight, run. The nozzle body channel can therefore be a complex one

Have cooling channel geometry, so that the outlet nozzle and the holder body channel can be arranged in any position relative to one another and connected through the nozzle body channel. On the one hand, this creates new opportunities to

The holder body channel is easy to manufacture and space-efficient

accommodate. On the other hand

According to an advantageous further development of the preferred embodiment, the nozzle body channel can have at least one curve and / or one kink. The nozzle body channel can have several subsections. For example, two adjoining subsections can enclose an angle. For example, a section can form a circular arc section. The nozzle body channel can preferably have at least two partial sections, in particular more than two

Have subsections that are linear, but a non-linear one

Form nozzle body channel. According to a particularly advantageous development, the nozzle body channel can have at least a partial section which is located completely inside the nozzle body, i.e. has no opening to an outer surface of the nozzle body.

In a preferred embodiment, the holder body channel can be formed from one or more channel sections which each run in a plane, in particular linearly. The holder body channel can also be connected to a desired

Channel routing, for example leading to a cooling lubricant connection, can be adapted.

In a preferred embodiment, the holder body and the

The nozzle body can be made of different materials. This enables to use the material properties of different materials and to combine them appropriately. For example, a material with a higher strength and / or wear resistance can be selected for the holder body than for the nozzle body. For example, a more cost-effective and / or easier to process material can be selected for the nozzle body than for the holder body and / or a material that is resistant to media influences. Alternatively, it is also possible to manufacture the holder body and the nozzle body from the same material.

In a preferred embodiment, the nozzle body can be manufactured monolithically, in particular generatively. In other words, the nozzle body is formed in one piece or in one material or integrally. According to an advantageous further development of the preferred embodiment, the nozzle body can be manufactured generatively. This has the advantage that the nozzle body with a complex

Geometry, especially in its interior, can be formed by means of a now easily controllable 3D printing. In this way it is possible to form almost any nozzle body channel geometry.

In a preferred embodiment, the holder body can be manufactured monolithically, in particular by machining. In other words, the holder body is formed in one piece or in one material or integrally. Alternatively, the holder body can also be constructed in several parts. According to an advantageous development of

In a preferred embodiment, the holder body, which is larger in comparison to the nozzle body, can be conventional, preferably in a machining manner

Manufacturing process, be manufactured. In a departure from this, however, the holder body can also be manufactured generatively.

According to a particularly advantageous development, the tool holder can be manufactured predominantly conventionally. This means that more than 50% of the volume of the tool holder, preferably more than 70% of the volume of the tool holder, more preferably more than 85% of the volume of the tool holder can be manufactured conventionally. This has the advantage that, for example, a nozzle body with an outlet nozzle can subsequently be inserted in an already existing tool holder, since only the nozzle body is precisely shaped and fitted, for example in a already mentioned pocket-like recess or receiving recess in the holder body ^' must be inserted.

In a preferred embodiment, the nozzle body can be detachably or exchangeably fixed in the holder body, in particular by clamping or screwing. Thus, the nozzle body can be exchanged separately from the holder body, for example if the nozzle body is damaged. The nozzle body can also be reused in an advantageous manner if the holder body has to be renewed or replaced.

In an alternative preferred embodiment, the nozzle body can be fixed in the holder body in a non-exchangeable manner, in particular in a materially bonded manner. In other words, the nozzle body is inseparable, i. E. Cannot be dismantled non-destructively, connected to the holder body. Further use in another holder body is thus excluded. In addition, the nozzle body can be attached to the holder body in a simple manner.

According to a preferred embodiment, the nozzle body can be in the

Holder body be inserted flush with the surface. In other words, the nozzle body is inserted into the holder body and matched to its shape in such a way that it does not significantly protrude from an outer surface of the holder body. According to a

In an advantageous further development of the preferred embodiment, the holder body can have a pocket-like recess which receives the nozzle body in a form-fitting manner. The joining play can be minimized to such an extent that the nozzle body can still be inserted, but no leaks occur in the inserted state. Alternatively, the depression can preferably be slightly larger in one direction of extent or in several directions of extent, for example up to 5% or up to 2 millimeters, so that insertion of the nozzle body is made easier.

In a preferred embodiment, the holder body can have a, for example, pocket-like cutting insert seat for the cutting insert. In the

In a preferred embodiment, the outlet nozzle can be oriented towards the cutting insert seat, in particular open into the cutting insert seat. This will allows the cooling lubricant of a cutting edge of the cutting insert about the ^'cutting insert seat, for example, along an edge of the cutting insert feed. By sliding along the cutting insert, the on the

The heat generated by the cutting edge can be dissipated better than when that

Cooling lubricant is supplied from the outside or opposite to a cutting direction. So the cooling lubricant can advantageously exactly to that

highly stressed area of the cutting insert are guided, and then guided away from this. If the outlet nozzle is arranged in a cross-sectional plane of the cutting insert or the cutting insert seat, that can

Cooling lubricant, regardless of the cooling lubricant speed, can be supplied to the cutting insert particularly precisely, since the

Cooling lubricant jet only needs to be adjusted in one plane. This means that the cooling lubricant jet does not have to be additionally aligned in a transverse direction of the cutting insert or the tool holder, which usually corresponds to a vertical direction.

In a preferred embodiment, the nozzle body can have a cylindrical or prismatic shape. If the nozzle body has a geometrically simple outer shape, the pocket-like depression or receiving recess to be formed in the holder body can also be formed simply. A plate-shaped nozzle body, preferably with a constant thickness, for example with a rectangular or angled or L-shaped cross-section, which extends from outside the holder body into the pocket-like recess or

Can insert the receiving recess and is rotatably arranged by a form fit in the pocket-like recess or receiving recess.

According to the invention, a cutting tool, in particular a turning or piercing tool, with a tool holder according to the invention and an am

Tool holder held cutting insert proposed.

In a preferred embodiment of the cutting tool, the

Outlet nozzle of the nozzle body to a protruding beyond the tool holder Be aligned towards the cutting edge of the cutting insert. This ensures an effective cooling lubricant supply to the cutting edge.

Brief description of the figures

Fig. 1 is a perspective view of one of the present invention

Cutting tool with a tool holder according to the invention according to a first embodiment of the present invention;

Fig. 2 is a perspective view of a nozzle body of the tool holder according to the first embodiment;

3 is a cross-sectional view of the nozzle body of the tool holder according to the first embodiment;

Fig. 4 is a perspective view of the cutting tool with the

Tool holder according to a second embodiment of the present invention;

Fig. 5 is a perspective view of the cutting tool with the

Tool holder according to a third embodiment of the present invention;

6 is a perspective view of a nozzle body according to a fourth embodiment; and

7 is a cross-sectional view of the nozzle body according to the fourth embodiment.

Description of the embodiments

Preferred embodiments of a tool holder according to the invention and a cutting tool according to the invention are described below with the aid of the Figures described in more detail. The figures are only of a schematic nature and serve to understand the invention. The same elements are with the same

Marked with reference symbols.

First embodiment

Fig. 1 shows a perspective view of an inventive

Tool holder 2 according to a first embodiment. The tool holder 2 is for holding a cutting insert 4, in particular a cutting insert, e.g.

Indexable insert, formed. The tool holder 2 has a holder body 6 with an inner holder body channel 8 and a nozzle body 10 fixed on the holder body 6 with an inner nozzle body channel 12 connected to the holder body channel 8 and with an outlet nozzle 14 connected to the nozzle body channel 12. The tool holder 2 and the cutting insert 4 held in the tool holder 2 form a cutting tool 16. In the illustrated embodiments, the cutting tool 16 is designed as a turning tool. The

However, the cutting tool can also be designed as a piercing tool, even if this is not shown.

The tool holder 2 has a cutting insert seat 18 for the cutting insert 4. The cutting insert seat 18 is formed by a recess which is recessed with respect to a surface 6 a of the holder body 6. The cutting insert 4 is in the

Cutting tool seat 18 secured by a fastener such as screw 20. The cutting insert 4 is arranged in the cutting insert seat 18 such that a cutting edge 22 of the cutting insert 4, in particular a cutting corner 24, projects beyond the tool holder 2.

The tool holder 2 according to the invention is constructed in several parts from the holder body 6 and the nozzle body 10. The nozzle body 10 is inserted into the holder body 6 with a precise fit and shape. The nozzle body 10 can also be referred to as a nozzle insert. In the exemplary embodiments shown, the holder body 6 has a pocket-like depression or recess 26 into which the nozzle body 10 is inserted. The shape of the nozzle body 10 corresponds to the shape of Recess 26 so that the nozzle body 10 can be inserted into the holder body 6 with an accurate shape by being pushed. The nozzle body 10 is monolithic, ie

in one piece, formed. In particular, the nozzle body 10 is manufactured using an additive manufacturing process. The holder body 6 is monolithic, i. in one piece, formed. In particular, the holder body 6 is by a conventional one

Manufacturing process, preferably manufactured by a machining manufacturing process. In the exemplary embodiment shown, the nozzle body 10 is fastened in the holder body 6 by gluing or clamping. Alternatively, the nozzle body 10 by a non-destructive detachable connection such as a

Screw connection be fastened in the holder body 6.

In the embodiment shown, a surface of the nozzle body 10, which is hereinafter referred to as an end face 10a, goes into the surface 6a of the

Holder body 6 over. The end face 10a neither protrudes from the surface 6a nor is it recessed with respect to the surface 6a. The end face 10a is therefore

flush with the surface 6a. In particular, a surface of the nozzle body 10, which is referred to below as a first side surface 10b, merges into a surface 6b of the holder body 6. The first side surface 10b neither protrudes from the surface 6b nor is it recessed with respect to the surface 6b. The first side face 10b therefore lies flush with the surface 6b. In particular, one surface of the nozzle body 10, which is hereinafter referred to as a second

Side surface 10c is designated, in a surface 6c of the holder body 6 over. The second side surface 10c neither protrudes from the surface 6c nor is it recessed with respect to the surface 6c. The second side surface 10c is therefore flush with the surface 6c. Alternatively, the second side surface 10c of the nozzle body 10 can also be arranged within the holder body 6, so that it does not form an outer surface of the tool holder 2. In other words, inserting the nozzle body 10 into the holder body 6 with a precisely fitting and precise shape is understood to mean that the outer surfaces of the tool holder 2 formed by the nozzle body 10 merge (surface) flush with the outer surfaces of the tool holder 2 formed by the holder body 6. The holder body channel 8 is designed as a straight channel in the illustrated embodiments. The holder body channel 8 can, however, also be formed by a plurality of rectilinear sub-channels that are inclined to one another, even if this is not shown.

Figs. 2 and 3 show the nozzle body 10 according to the first

Embodiment. The nozzle body 10 is plate-shaped and has an L-shaped cross section. The nozzle body channel 12 is formed in the interior of the nozzle body 10 and the cross section of the nozzle body channel 12 is surrounded by the material of the nozzle body 10. The nozzle body channel 12 has a first section 28 and a second section 30. The first section 28 opens into the outlet nozzle 14 on an outer surface of the nozzle body 10. When the nozzle body 10 is inserted into the holder body 6, the outlet nozzle 14 opens into the cutting insert seat 18. The first section 28 is a partial channel of the nozzle body channel 12 and is straight . The second section 30 is a sub-channel of the nozzle body channel 12 and is straight. The second section 30 opens into the first section 28. The two sections 28, 30 enclose an angle, shown in FIG

Embodiment an angle of about 90 °. The second section 30 opens to an outer surface of the nozzle body 10, which rests against a surface of the holder body 6, so that it does not form an outer surface of the tool holder 2. Of the

The holder body channel 8 opens into the second section 30 of the nozzle body channel 12. The coolant is thus guided through the holder body channel 8, into the second section 30 of the nozzle body channel 12, into the first section 28 of the nozzle body channel 12 and then out of the outlet nozzle 14 to the cutting insert 4.

4 shows the tool holder 2 according to a second embodiment. The second embodiment corresponds essentially to the first embodiment, apart from the formation of the recess 26 in the holder body 6 and the formation of the nozzle body 10. The nozzle body 10 according to the second

Embodiment is plate-shaped and has a rectangular cross-section. The nozzle body channel 12 is designed analogously to the nozzle body channel 12 according to the first embodiment and has the first section 28 and the second section 30 angled thereto. The shape of the recess 26 is the Shape of the nozzle body 10 adapted and has a rectangular cross section. The depth of the recess 26 corresponds to the thickness of the nozzle body 10.

5 shows the tool holder 2 according to a third embodiment. The third embodiment corresponds essentially to the first embodiment, apart from the formation of the recess 26 in the flalter body 6, the formation of the nozzle body 10 and the formation of the holder body channel 8. The holder body channel 8 according to the third embodiment extends in a straight line through the holder body 6 and opens on a side surface that is the second side surface 10c, in the

Nozzle body channel 12. The nozzle body 10 according to the third embodiment is plate-shaped and has a rectangular cross-section. The shape of the recess 26 is adapted to the shape of the nozzle body 10 and has a rectangular cross section. The depth of the recess 26 corresponds to the thickness of the nozzle body 10. A width of the nozzle body 10 corresponds to a width of the holder body 6 in the area in which the nozzle body 10 is inserted. As a result, the nozzle body 10 can be pushed into the holder body 6 from the second side. The nozzle body 10 is fixed to the holder body 6 by a fixing means such as a screw 32. The nozzle body 10 can therefore easily be exchanged. The nozzle body channel 12 according to the third embodiment has three subsections. The subsections are each formed in a straight line and merge into one another over a radius.

Figs. 6 and 7 show the nozzle body 10 according to a fourth embodiment. The nozzle body 10 according to the fourth embodiment corresponds essentially to the nozzle body 10 according to the third embodiment, apart from

Formation of the nozzle body channel 12. The nozzle body channel 12 of the fourth

Embodiment is formed by a first section 34, a second section 36 and a third section 38. The first section 34 opens into the outlet nozzle 14 and has a curved course. The first section 34 is essentially circular arc-shaped. The second section 36 is straight. The third

Section 38 is linear and inclined to the second section 36. The holder body channel 8 opens into the third section 38, the coolant is then passed through the second section 36 and then passed via the first section 34 to the outlet nozzle 14.

The design of the nozzle body channel 12 can be almost as desired. The exemplary embodiments described represent only exemplary channel guides.

Claims

Expectations

1. Tool holder (2) for holding a cutting insert (4), in particular a cutting insert, with a holder body (6) which has an inner holder body channel (8), and a nozzle body (10) fixed on the holder body (6), which has a the holder body channel (8) connected to the nozzle body channel (12) and an outlet nozzle (14) adjoining the nozzle body channel (12), thereby

characterized in that the nozzle body (10) is inserted in the holder body (6) with a precise shape and fit.

2. Tool holder (2) according to claim 1, characterized in that the nozzle body channel (12) is non-linear.

3. Tool holder according to claim 2, characterized in that the

Nozzle body channel (12) has at least one curvature and / or one.

4. Tool holder (2) according to one of the preceding claims, characterized in that the holder body (6) and the nozzle body (10) from

are made of different materials.

5. Tool holder (2) according to one of the preceding claims, characterized in that the nozzle body (10) is made monolithically, in particular generatively.

6. Tool holder (2) according to one of the preceding claims, characterized in that the holder body (6) monolithically, in particular through

Machining, is manufactured.

7. Tool holder (2) according to one of the preceding claims, characterized in that the nozzle body (10) in the holder body (6) is exchangeable, in particular fixed by clamping or screwing.

8. Tool holder (2) according to one of claims 1 to 6, characterized in that the nozzle body (10) is fixed in the holder body (6) so as not to be exchangeable, in particular cohesively.

9. Tool holder (2) according to one of the preceding claims, characterized in that the nozzle body (10) is inserted into the holder body (6) flush with the surface.

10. Tool holder (2) according to one of the preceding claims, characterized in that the holder body (6) has a cutting insert seat (18) for the cutting insert (4), and the outlet nozzle (14) is oriented towards the cutting insert seat (18).

1 1. Cutting tool (16), in particular turning or piercing tool, with a tool holder (2) according to one of claims 1 to 10 and a cutting insert (4) held on the tool holder (2).

12. Cutting tool (16) according to claim 11, characterized in that the outlet nozzle (14) is oriented towards a cutting edge (22) of the cutting insert (4) projecting beyond the tool holder (2).