阅读说明：本技术 变径套筒、提供变径套筒组件的模块化系统以及加工组件 (Reducing sleeve, modular system for providing reducing sleeve assembly and machining assembly ) 是由 J.赫鲁德 于 2021-04-07 设计创作，主要内容包括：本发明公开了变径套筒、提供变径套筒组件的模块化系统以及加工组件。描述了一种用于将加工工具(16)紧固在工具架(12)中的变径套筒(14)。所述变径套筒包括变径套筒主体(20),所述变径套筒主体包括第一工具侧端(24)和第二工具架侧端(26)。另外,至少一个冷却剂供应通道(32)设置在所述变径套筒主体(20)中。此外,多功能接口(34)布置在所述第二端(26)处,并且被设计成用于联接到密封单元和安全单元。另外呈现了一种用于提供包括此变径套筒(14)、密封单元和安全单元的变径套筒组件(13)的模块化系统。另外,呈现了一种具有工具架(12)、变径套筒(14)和加工工具(16)的加工组件(10)。(The invention discloses a reducing sleeve, a modular system for providing a reducing sleeve assembly and a machining assembly. A reducing sleeve (14) for securing a working tool (16) in a tool holder (12) is described. The reducing sleeve comprises a reducing sleeve body (20) which comprises a first tool side end (24) and a second tool holder side end (26). Additionally, at least one coolant supply channel (32) is disposed in the reducing sleeve body (20). Furthermore, a multifunctional interface (34) is arranged at the second end (26) and is designed for coupling to a sealing unit and a safety unit. A modular system for providing a reducing sleeve assembly (13) comprising such a reducing sleeve (14), a sealing unit and a safety unit is also presented. Additionally, a machining assembly (10) having a tool holder (12), a reducing sleeve (14) and a machining tool (16) is presented.)

1. A reducing sleeve (14) for securing a working tool (16) in a tool holder (12),

it comprises a reducing sleeve body (20) extending along a reducing sleeve central axis (22), and

the reducing sleeve body has a first end (24) which is a tool-side end in a clamped state of the reducing sleeve (14) and a second end (26) which is opposite the first end (24) and which is a tool holder-side end in the clamped state of the reducing sleeve (14),

wherein the reducing sleeve body (20) comprises at least one coolant supply channel (32) extending at a distance from the reducing sleeve central axis (22),

it is characterized in that the preparation method is characterized in that,

providing a multi-function interface (34) at the second end (26) designed to couple the reducing sleeve body (20) to a sealing unit (36) for sealing the at least one coolant supply channel (32) and to couple the reducing sleeve body (20) to a safety unit (48) for providing a pull-out safety geometry (54) for the machining tool (16).

2. Reducing sleeve (14) according to claim 1, characterized in that the at least one coolant supply channel (32) extends at least partially inside the reducing sleeve body (20) or is at least partially designed as a groove (32e) extending on the outer circumference of the reducing sleeve body (20).

3. Variable diameter sleeve (14) according to claim 1 or 2, wherein the interface (34) comprises an internal thread (44), wherein the internal thread (44) is designed to cooperate with both a counterpart of the sealing unit (36) and a counterpart of the safety unit (48).

4. Variable diameter sleeve (14) according to claim 3, wherein the internal thread (44) acts as a latching profile (46) for the counterpart of the sealing unit (36).

5. A modular system for providing a reducing sleeve assembly (13) comprising

Reducing sleeve (14) according to one of claims 1 to 4,

a sealing unit (36) for sealing the at least one coolant supply channel (32) of the reducing sleeve (14), and

a safety unit (48) for providing a pull-out safety geometry (54) for the machining tool (16),

wherein the multi-function interface (34) of the reducing sleeve (14) is selectively coupleable to the sealing unit (36) or the safety unit (48).

6. Modular system according to claim 5, characterized in that the safety unit (48) is coupled to the reducing sleeve body (20) via the multifunctional interface (34), wherein a first external thread (50) of the safety unit (48) is in particular screwed into the internal thread (44) of the interface (34).

7. Modular system according to claim 5 or 6, characterized in that the safety unit (48) has a pull-out safety geometry (54) designed to form a form fit with a machining tool (16) which acts along the reducing sleeve centre axis (22) and counteracts any pulling of the machining tool (16) out of the reducing sleeve (14).

8. Modular system according to one of the claims 5 to 7, characterized in that the safety unit (48) comprises a second external thread (52) for fastening the combination of the safety unit (48) and the reducing sleeve (14) to the tool holder (12).

9. Modular system according to claim 5, characterized in that the sealing unit (36) is coupled to the reducing sleeve body (20) via the multifunctional interface (34), wherein a latching profile (42) of the sealing unit (36) in particular latches to the internal thread (44) of the interface (34).

10. Modular system according to claim 9, characterized in that the sealing unit (36) has a substantially cylindrical latching section (40) with a central axis substantially coinciding with the reducing sleeve central axis (22) in the assembled state of the sealing unit (36), wherein the latching profile (42) of the sealing unit (36) is arranged on an outer circumference of the latching section (40).

11. Modular system according to claim 9 or 10, characterized in that the sealing unit (36) has a sealing portion (38) for liquid-tight sealing of the at least one coolant supply channel (32), wherein the sealing portion (38) seals the coolant supply channel (32) in an axial direction, in particular in the assembled state of the sealing unit (36).

12. Modular system according to one of the claims 9 to 11, characterized in that the sealing unit (36) is made of plastic material.

13. Machining assembly (10) with a tool holder (12), a reducing sleeve (14) according to one of claims 1 to 4 arranged in the tool holder (12) and a machining tool (16) with a tool shaft (18) accommodated inside the reducing sleeve (14).

14. The machining assembly (10) of claim 13, characterized in that the reduction sleeve (14) is equipped with a safety unit (48), wherein the machining tool (16) is coupled to the safety unit (48) via a form fit that acts along the reduction sleeve central axis (22) and resists any pulling of the machining tool (16) out of the reduction sleeve (14).

15. The machining assembly (10) according to claim 13, characterized in that the reducing sleeve (14) is equipped with a sealing unit (36) by means of which all coolant supply channels (32) provided on the reducing sleeve (14) are sealed.

Technical Field

The present invention relates to a reducing sleeve for securing a working tool in a tool holder. The reducing sleeve includes a reducing sleeve body extending along a reducing sleeve central axis and having a first end that is a tool side end in a clamped state of the reducing sleeve and a second end that is opposite to the first end and is a tool holder side end in the clamped state of the reducing sleeve. Additionally, the reducing sleeve body includes at least one coolant supply channel extending at a distance from the reducing sleeve central axis.

The present invention also relates to a modular system for providing a reducing sleeve assembly.

The invention also relates to a machining assembly with a tool holder, a reducing sleeve of the aforementioned type arranged in the tool holder, and a machining tool with a tool shaft accommodated inside the reducing sleeve.

Background

Such a reducing sleeve and a machining assembly equipped with such a reducing sleeve are known from the prior art. The tool holder may be a hydraulically drivable tool holder, also referred to simply as a hydraulic tool holder.

Reducing sleeves are commonly used to securely retain a working tool in an associated tool holder of a working assembly. This is basically done by clamping the tool shaft in the tool holder via a reducing sleeve. The diameter or thickness difference between the processing tool and the tool holder is made up by the reducing sleeve. In this regard, the reducing sleeve may be designed according to a number of variations. It is known in particular that the reducing sleeve has an additional pull-out safety geometry, so that on the one hand the tool shaft can be clamped in the tool holder and on the other hand the tool shaft is secured in a form-fitting manner via the pull-out safety geometry so as not to be pulled out of the reducing sleeve and/or the tool holder. Such a reducing sleeve is also known under the term "safety locking", so that a safety locking mechanism or a safety locking reducing sleeve is often also mentioned.

A coolant supply channel in the reducing sleeve body may be used to direct coolant to the machining zone. For this purpose, it is not necessary to provide the coolant supply channel also on the processing tool itself. Thus, the reducing sleeve may also be used to supply coolant. Of course, variable diameter sleeves without coolant supply channels are also known in this connection. These sleeves may be used, for example, with a machining tool having coolant supply channels integrated therein.

In summary, various variants of reducing sleeves are known. Depending on the machining task to be performed, the most suitable one may be selected from these variations. However, this results in a certain amount of storage cost, the objective being to always be able to keep a suitable reducing sleeve available for a range of machining tasks.

On the one hand, this applies to manufacturing environments in which the reducing sleeve and the machining tool held by means of it are used for producing other components. On the other hand, this also applies to manufacturing environments where reducing sleeves are produced with higher variation. In both manufacturing environments, the known reducing sleeves therefore incur costs due to the large number of variants and associated storage devices mentioned.

Disclosure of Invention

The object of the present invention is to improve the known reducing sleeves so that they can be produced economically and efficiently and can be used to produce other components at low cost.

This object is achieved by a reducing sleeve of the type mentioned at the outset having a multifunctional interface at the second end, which is designed for coupling the reducing sleeve body to a sealing unit for sealing at least one coolant supply channel and for coupling the reducing sleeve body to a safety unit for providing a pull-out safety geometry for a machining tool. Thus, the reducing sleeve may be used universally in a variety of applications.

The reducing sleeve can be used in particular without a sealing unit and without a safety unit. The reducing sleeve may then be used to hold a machine tool that does not have any coolant supply channels. Then, the coolant supply of the associated machining zone is performed via the coolant supply channel provided on the reducing sleeve. If the reducing sleeve is equipped with a safety unit, it is possible to provide pull-out safety of the working tool, not just clamping. In the case where the reducing sleeve is equipped with the sealing unit, the coolant supply passage provided in the reducing sleeve is reliably sealed. Therefore, the machining task can be reliably completed in the dry process, or the coolant can be introduced into such a coolant supply passage provided on the machining tool.

Providing such a reduction sleeve together with a sealing unit and a safety unit results in a significant reduction of storage costs compared to known solutions, since only a single reduction sleeve according to the invention has to remain available together with the safety unit and/or the sealing unit compared to various reduction sleeves. The safety unit and the sealing unit act in the broadest sense as adapters. In addition, the reducing sleeve according to the present invention may be a component of a modular system, as will be explained below.

The reducing sleeve body of this reducing sleeve is in particular a production-produced component, which is also referred to as an additive-produced component. The reducing sleeve body is preferably produced by means of a 3D printing method or SLS method ("selective laser sintering"). Instead, the reducing sleeve body is produced in a conventional manner, in particular using a manufacturing process.

In one variant, a reducing sleeve is provided at its tool side end with a contact flange, via which the reducing sleeve can be attached to an associated tool holder. This enables a reliable and accurate positioning of the reducing sleeve on the tool holder.

It is also possible that the slots extend on the reducing sleeve body (substantially) parallel to the reducing sleeve central axis. In this way, the elasticity of the reducing sleeve can be increased in the circumferential direction. This increases the reliability with which the reducing sleeve can grip the working tool.

The multifunction interface basically ensures that several different functions (versatility) can be combined by means of the interface by coupling corresponding components, for example, a sealing unit or a safety unit, to the multifunction interface.

The at least one coolant supply channel may extend at least partially inside the reducing sleeve body, or be at least partially designed as a groove extending on the outer circumference of the reducing sleeve body. In the first case, the coolant supply channel is therefore at least partially embedded in the reducing sleeve body in a circumferentially closed manner. In the second case, the coolant supply channel is at least partially radially open and is completed, i.e. closed, by the associated wall of the tool holder. Both variants make it possible to introduce the coolant reliably into the processing zone or to guide it into the processing zone.

According to one embodiment, the interface comprises an internal thread, wherein the internal thread is designed to cooperate with both a counterpart of the sealing unit and a counterpart of the safety unit. Thus, the internal thread is a core component of the multifunctional interface. The internal thread is designed to cooperate with a plurality of components acting as adapters, in particular with the safety unit and the sealing unit. This results in a wide range of possible uses for the reducing sleeve. In addition, the multifunction interface can be used for adapters developed in the future.

The internal thread may serve as a latching contour for a counterpart of the sealing unit. Thus, the internal thread has at least two functions. On the one hand, it acts as a thread and, on the other hand, as a latching profile. This results in a possible multi-functional use of the interface.

In principle, a reducing sleeve assembly may also be provided, comprising a reducing sleeve of the aforementioned type and a sealing unit for sealing at least one coolant supply channel of the reducing sleeve and/or a safety unit for providing a pull-out safety geometry for a machining tool.

Additionally, the object is achieved by a modular system for providing a reducing sleeve assembly. The modular system comprises a reducing sleeve according to the invention, a sealing unit for sealing at least one coolant supply channel of the reducing sleeve, and a safety unit for providing a pull-out safety geometry for a machining tool. The multi-functional interface of the reducing sleeve may be selectively coupled to the sealing unit or the safety unit. This modular system significantly reduces storage costs over the same range of functions as the prior art, which must provide a plurality of different reducing sleeves. As a result, only relatively low manufacturing and supply costs result. This is especially because the safety unit and the sealing unit are much smaller than the reducing sleeve. In addition, the safety unit and the sealing unit are designed to cooperate with various reducing sleeves. This also reduces storage costs and therefore manufacturing and supply costs.

By means of this modular system, a reducing sleeve assembly may thus be provided which performs the same function as a known reducing sleeve without coolant supply channels, for example, which may be used for machining tools equipped with coolant supply channels. In this case, the reducing sleeve according to the present invention is provided with a sealing unit. Additionally, a reducing sleeve assembly with coolant supply channels may be provided by way of a modular system. This reducing sleeve assembly may cooperate with a machining tool that does not have coolant supply channels of its own. In this case, the reducing sleeve according to the invention is neither equipped with a sealing unit nor with a safety unit. Furthermore, a reducing sleeve assembly with pull-out safety geometry (safety lock) may be provided by means of a modular system. The reducing sleeve assembly may be used with such a tool having a corresponding inverse geometry for pulling out the safety geometry. In this application, the reducing sleeve according to the invention is equipped with a safety unit.

In this regard, the sealing unit is preferably a plastic part. For example, the sealing unit is designed as an injection-molded part.

The safety unit may be designed to produce a manufactured/additively manufactured component. The security element is then preferably produced by means of a 3D printing method or an SLS method.

According to one variant, the safety unit is coupled to the reducing sleeve body via a multifunctional interface. In this case, the first external thread of the safety unit is screwed in particular into the internal thread of the interface. The safety unit is a separate component from the reducing sleeve body. The safety unit is securely connected to the reducing sleeve body via the external thread and the internal thread. The external threads represent the counterparts to the internal threads of the multi-function interface. The designation of the external thread is first of all used only for a simple explanation. This does not mean that there are a number of external threads. Thus, in addition to the usual clamping, this reducing sleeve assembly may also provide additional pull-out safety (safety lock) of the working tool.

The safety unit may have a central opening to the coolant supply. The safety unit can therefore also be used in connection with a processing tool which itself has a coolant supply channel.

In this connection, the safety unit preferably has a pull-out safety geometry which is designed to form a form fit with the working tool which acts along the central axis of the reducing sleeve and prevents the working tool from being pulled out of the reducing sleeve. In this case, the pull-out safety geometry is located in particular radially within the first external thread. The pull-out safety geometry preferably extends in a spiral manner on the inner circumference of the safety unit. According to one embodiment, the pull-out safety geometry thus represents a threaded portion into which a machining tool, more precisely an associated tool shaft, can be screwed.

The safety unit may include a second external thread for securing the combination of the safety unit and the reducing sleeve to the tool holder. The second external thread is preferably arranged axially adjacent to the first external thread, in particular with respect to the central axis of the reducer sleeve. The diameter of the first external thread is also preferably different from the diameter of the second external thread. In particular, the diameter of the second external thread is smaller than the diameter of the first external thread. Thus, the safety unit can be mounted at only one position on the reducing sleeve. Thus, incorrect components can be reliably excluded ("error-proof" principle). In this way, the working tool can also be held particularly securely on the tool holder.

Alternatively, the sealing unit is coupled to the reducing sleeve body via a multi-function interface. In particular, the latching contour of the sealing unit is latched to the internal thread of the interface. The latching contour of the sealing unit represents the counterpart of the internal thread of the multi-functional interface. The sealing unit is also a separate component from the reducing sleeve body. As already explained in connection with the safety unit, the sealing unit may also have a central opening to the coolant supply. Then, a machining tool having its own coolant supply channel may also be used in combination with the sealing unit.

The sealing unit advantageously comprises a substantially (circular) cylindrical latching section, the central axis of which substantially coincides with the central axis of the reducing sleeve in the assembled state of the sealing unit, wherein the latching contour of the sealing unit is arranged on the outer circumference of the latching section. In this way, the sealing unit may be reliably latched to the reducing sleeve.

Alternatively or additionally, the sealing unit comprises a sealing portion for liquid-tight sealing of the at least one coolant supply channel. In the assembled state of the sealing unit, the sealing portion seals the at least one coolant supply channel, in particular in the axial direction. Thereby reliably sealing one or more coolant supply passages of the reducing sleeve. Overall, the simple design of the sealing unit makes it easy and cost-effective to produce.

The sealing unit is preferably made of plastic. On the one hand, this results in advantageous sealing properties. On the other hand, such a sealing unit can be produced easily and economically, particularly in high quantities.

In addition, the object is achieved by a machining assembly of the type mentioned at the outset, in which the reducing sleeve according to the invention is arranged in a tool holder in the machining assembly. The tool shaft is accommodated inside the reducing sleeve according to the invention. Coolant supply channels in the reducing sleeve are optionally fluidly coupled to associated coolant supply channels in the tool holder so that coolant can be supplied to the machining zone.

The reducing sleeve may be equipped with a safety unit, wherein the working tool is coupled to the safety unit via a form fit that acts along the reducing sleeve central axis and counteracts any pulling of the working tool out of the reducing sleeve. In this case, the reducing sleeve is in particular additionally fastened axially in the tool holder via a safety unit. This makes the processing tool particularly securely held in the tool holder.

Alternatively, the reducing sleeve may be equipped with a sealing unit by means of which all coolant supply channels provided on the reducing sleeve are sealed. The coolant supply channels in the process tool may then be supplied with coolant via the tool holder, or the coolant supply may be dispensed with, so that a dry process may be performed.

Drawings

The invention is explained below with reference to various exemplary embodiments shown in the drawings. The drawings show:

figure 1 is an exploded view of a tooling assembly according to the present invention, according to a first embodiment, having a reducing sleeve assembly provided by a modular system according to the present invention, and including a reducing sleeve according to the present invention,

fig. 2 is a diagram of a tooling assembly according to a first embodiment corresponding to fig. 1, wherein the reducing sleeve assembly is shown in cross-section,

figure 3 is a perspective illustration of a reducing sleeve according to a variant,

figure 4 another perspective illustration of the reducing sleeve of figure 3,

figure 5 a side view of the reducing sleeve of figures 3 and 4,

figure 6 is a cross-sectional view of the reducing sleeve of figure 5 taken along line VI-VI,

figure 7 is an exploded view of a tooling assembly according to the present invention according to a second embodiment, with a reducing sleeve assembly provided by a modular system according to the present invention, and including a reducing sleeve according to the present invention,

FIG. 8 is a diagram of a tooling assembly according to a second embodiment corresponding to FIG. 7, with the reducing sleeve assembly assembled and shown in cross-section,

figure 9 is an exploded view of a tooling assembly according to the present invention according to a third embodiment, having a reducing sleeve assembly provided by a modular system according to the present invention, and including a reducing sleeve according to the present invention,

FIG. 10 is a representation of a tooling assembly according to a third embodiment corresponding to FIG. 9, with the reducing sleeve assembly assembled and shown in cross-section,

figure 11 is an isolated perspective view of the sealing unit of the processing assembly according to the invention of figures 7 and 8,

fig. 12 is an isolated perspective view of the safety unit of the working assembly according to the invention, fig. 9 and 10, an

Fig. 13 shows the security unit of fig. 12 from a different perspective.

Detailed Description

Fig. 1 and 2 show a tooling assembly 10 according to a first embodiment.

The machining assembly includes a tool holder 12 designed as a hydraulic tool holder.

The machining assembly 10 also has a reducing sleeve assembly 13 having a reducing sleeve 14 arranged in the tool holder 12 in an assembled state.

Additionally, the machining assembly 10 includes a machining tool 16 having a tool shaft 18. In the assembled state, the tool shaft 18 is accommodated inside the reducing sleeve 14.

The reducing sleeve 14 thus serves to secure the working tool 16 in the tool holder 12.

To this end, the reducing sleeve includes a reducing sleeve body 20 extending along a reducing sleeve central axis 22.

The reducing sleeve body has a first end 24 and a second end 26 opposite the first end 24. In this case, in the clamped state of the reduction sleeve 14, the first end 24 is the tool-side end via which the machining tool 16 is inserted into the reduction sleeve 14, and the second end 26 is the tool holder-side end via which the reduction sleeve 14 is inserted into the tool holder 12.

At the first end 24, the reducing sleeve 14 additionally has a contact flange 28 which, in the assembled state, bears axially, i.e. with respect to the reducing sleeve central axis 22, against the tool holder 12.

The reducing sleeve body 20 also has at least one optional substantially axially extending slot 20a for increasing circumferential elasticity.

Further, a holding region 30 of the tool shaft 18 is formed inside the reducing sleeve body 20. In the assembled state, the tool shaft 18 is clamped in the holding region 30 by means of the hydraulic tool holder 12.

Further, the reducer sleeve body 20 has a plurality of coolant supply passages 32, each of which is constituted by a first hole portion 32a extending substantially parallel to the reducer sleeve central axis 22, a second hole portion 32b extending substantially radially with respect to the reducer sleeve central axis 22, a groove portion 32c, and a third hole portion 32 d.

Since the groove portion 32c is the largest portion of the coolant supply passage 32 so far, the coolant supply passage 32 may also be simply referred to as a groove 32 e.

At least one groove 32e may be formed on the outside of the reducing sleeve body 20 such that the at least one coolant supply passage 32 opens radially outward. When the reducing sleeve 14 is inserted into the tool holder 12, the corresponding groove 32e is closed by the inside of the tool holder 12, thereby forming at least one (circumferentially closed) coolant supply channel 32.

Alternatively, at least one coolant supply channel 32 may be embedded in the reducing sleeve body 20. In this respect, the respective coolant supply channel 32 can already be circumferentially closed.

The machining zone, which is not shown in more detail, can be supplied with coolant by means of a coolant supply channel 32.

The coolant supply channels 32 all extend at a distance from the reducer sleeve central axis 22, i.e. radially to the reducer sleeve central axis 22. Furthermore, the coolant supply channel 32 extends substantially axially, i.e. parallel to the reducing sleeve central axis 22.

In this regard, the machining tool 16 is designed to have no coolant supply channel of its own.

Furthermore, the reducing sleeve 14 is provided with a multi-function interface 34, which will be explained in more detail in connection with the following embodiments.

Fig. 3 to 6 show a variant of the reducing sleeve 14. Only the differences with the reducer sleeve according to fig. 1 and 2 are discussed below.

The reducing sleeve 14 according to the modification is different from the reducing sleeve 14 explained previously in the shape of the coolant supply passage 32.

A circumferential coolant supply groove 32f is provided on the outer circumference of the reducing sleeve body 20. The coolant may be introduced into the coolant supply slot via a coolant supply channel (not shown in greater detail) of the associated tool holder 12.

A number of coolant supply slots 32g extend from the coolant supply groove 32f along the reducer sleeve central axis 22. The coolant supply slots are continuous in the radial direction on the reducing sleeve body 20 and are sealed radially on the inside by inserting the tool shaft 18 into the reducing sleeve body 20 and radially on the outside by inserting the reducing sleeve 14 into the tool holder 12.

In the region of the first end 24, each coolant supply groove 32f is adjoined by a bore portion 32h which extends substantially parallel to the reducing sleeve central axis 22 and via which coolant can be introduced into a machining zone which is not shown in greater detail.

In the case where the coolant supply passage 32 of the reducing sleeve 14 is not used for coolant supply, a sealing member such as an O-ring 33a may be inserted into the coolant supply groove 32f so that the coolant supply slot 32g is sealed in a liquid-tight manner with respect to the coolant supply on the tool holder side (see fig. 6).

In this regard, for example, a machining tool 16 having its own cooling passages may be received in the reducing sleeve 14.

In addition, independently of the use of the coolant supply channel 32, an O-ring 33b may be provided, which in the assembled state of the reducing sleeve is located in a sealing manner between the contact flange 28 and the tool holder 12. The O-ring 33b ensures that coolant is only exhausted via the provided coolant supply channel 32, rather than some via any intermediate space formed between the reducing sleeve 14 and the tool holder 12.

Of course, O-ring 33b may also be used in reducing sleeve 14 of fig. 1 and 2.

Fig. 7 and 8 show a tooling assembly 10 according to a second embodiment. Only the differences from the first embodiment are discussed below. For the rest, please refer to the above explanation.

The reducing sleeve 14 is now equipped with a sealing unit 36, by means of which all coolant supply channels 32 provided on the reducing sleeve 14 are sealed.

The sealing unit 36 has a sealing portion 38 for liquid-tightly sealing the coolant supply channel 32. In the assembled state of the sealing unit 36, the sealing section seals the coolant supply channel 32, in particular in the axial direction, i.e. along the reducing sleeve central axis 22.

In addition, the sealing unit 36 has a substantially cylindrical latching portion 40.

In the assembled state of the sealing unit 36, the central axis of the latching portion 40 substantially coincides with the reducing sleeve central axis 22.

On the outer circumference of the latching portion 40, a latching profile 42 may also be provided, which in the embodiment shown is formed by knurling or corrugation.

The sealing unit 36 is preferably made of plastic.

The sealing unit 36 is coupled to the reducing sleeve body 20 via the multi-function interface 34.

For this purpose, the interface 34 comprises an internal thread 44 (see also fig. 2) designed to cooperate with a latching portion 40 of the sealing unit 36, which serves as a counterpart for this purpose.

Thus, the internal thread 44 simultaneously represents the latching contour 46 of the reducing sleeve 14.

In other words, the sealing unit 36 is latched to the reducing sleeve body 20.

The sealing unit 36 can be seen in detail in fig. 11.

Fig. 9 and 10 show a tooling assembly 10 according to a third embodiment. Likewise, only the differences from the already explained embodiments are discussed. For the rest, please refer to the above explanation.

Instead of the sealing unit 36, the safety unit 48 is now coupled to the reducing sleeve body 20 via the multi-function interface 34.

In this connection, the safety unit 48 comprises a first external thread 50 which in the assembled state is screwed into the internal thread 44 of the interface. The safety unit 48 is thereby fixedly connected to the reducing sleeve body 20. In particular, this applies to the reducing sleeve central axis 22.

At the axial end of the safety unit 48 facing the holding area 30 in the assembled state, a chamfer 48a is also provided, the chamfer surface of which corresponds to the conical side surface portion.

In the assembled state of the safety unit 48, the chamfer 48a abuts against a stop surface 48b formed on the reducing sleeve body 20 (see also fig. 2 and 6). The stop surface 48b is also designed as a conical side surface portion so that the chamfer 48a can lie flat against it.

This allows the safety unit 48 to be precisely aligned with respect to the reducing sleeve 14. This relates in particular to the coaxiality of the central axis of the safety unit 48 and the central axis 22 of the reducing sleeve. This results in a variable diameter sleeve assembly formed in this manner having a high degree of concentricity.

In addition, the safety unit 48 is equipped with a second external thread 52, by means of which the reducing sleeve 14 can be fastened to the tool holder 12. The reducing sleeve 14 can thus be screwed into the tool holder 12 via the safety unit 48, so that it is secured against being pulled out of the tool holder 12 along the reducing sleeve central axis 22.

The safety unit 48 also has a pull-out safety geometry 54, which is designed to form a positive fit with the working tool 16 along the reducing sleeve central axis 22.

For this purpose, the pull-out safety geometry 54 engages in an associated counter-geometry 56 provided on the tool shaft 18.

In the embodiment shown, the pull-out safety geometry 54 is formed by a threaded portion 58 which comprises several projections or ribs which extend in a helical manner on the inner circumference of the safety unit 48 and form the threaded portion 58.

The counter-geometry 56 is thus formed by grooves which extend in a helical manner over the circumference of the tool shaft 18 and in which the projections or ribs of the threaded portion 58 engage.

Thus, the working tool 16 can be screwed onto the safety unit 48 via the pull-out safety geometry 54 and the counter geometry 56 in order to fix it in a form-fitting manner against being pulled out of the reducing sleeve 14.

In the illustrated embodiment, the pull-out safety geometry 54 is disposed radially within the first external thread 50.

A detailed view of the security unit 48 can be seen in fig. 12 and 13.

It can also be seen there that the safety unit 48 has a total of four optional axial slots 48 a.

In summary, reducing sleeve 14, sealing unit 36, and safety unit 48 form a modular system for providing reducing sleeve assembly 13.

Either the sealing unit 36 or the safety unit 48 or both are selectively coupled to the reducing sleeve 14 via the multi-function interface 34. Thus, depending on the machining tool 16 to be used, an appropriate reducing sleeve assembly 13 may always be provided.

Further, the reducing sleeve assembly 13 provides a central coolant supply passage 60 throughout all of the embodiments described above. The coolant supply channel may be used to supply coolant to a process tool 16 having a coolant supply channel.

In the case where the reducing sleeve 14 is used only to secure the tool 16, the central coolant supply passage 60 is formed by the axially open second end 26.

In the case of the use of a sealing unit 36, the central coolant supply channel is realized by a substantially axially extending and centrally arranged opening. The same applies to the security unit 48.