Assembly comprising a workpiece and a flow lapping device having a flow-guiding device for smoothing at least one surface of the workpiece

Abstract

The invention relates to an assembly comprising at least one workpiece (10), preferably an impeller and / or rotor, and a flow lapping device (100) for smoothing at least one surface of the workpiece (10) by means of an abrasive fluid, the flow lapping device (100) comprising at least one flow-guiding device (15) which is adapted to the geometry and the flow direction, present during operation, of at least one workpiece flow duct (11) of the workpiece (10).

Description

[0001] Arrangement comprising a workpiece and a flow lapping device with a flow guide device for smoothing at least one surface of the workpiece

[0002] Description

[0003] The invention relates to an arrangement comprising at least one workpiece, preferably an impeller and / or impeller, and a flow lapping device for smoothing at least one surface of the workpiece using an abrasive fluid. Furthermore, the invention relates to a corresponding flow lapping device and a method for smoothing at least one workpiece.

[0004] Flow lapping devices for smoothing the surface of a workpiece are generally known. WO 2021 / 099 319 A1, for example, describes a flow lapping device for smoothing the surface of a workpiece using an abrasive fluid. The flow lapping device comprises at least one holding plate for holding the workpiece and an enveloping device arranged around the holding plate, within which the fluid can flow. Furthermore, fluid guiding devices are described, which are inserted within the enveloping device to redirect the fluid at least partially within the enveloping device, so that it is directed toward an opening in the workpiece.

[0005] The flow lapping device according to the prior art is considered to be in need of improvement for workpieces with increased requirements regarding the degree of smoothing of the surfaces, in particular with regard to the preparation of the flow lapping device with the workpiece for carrying out the flow lapping process and / or with regard to the result of a flow lapping process carried out with the flow lapping device (with regard to smoothing, in particular taking into account an appropriate material removal, i.e. in particular neither locally too high nor too low).

[0006] The object of the invention is to propose an assembly comprising at least one workpiece and a flow lapping device, wherein an improved flow lapping process is to be realized by means of the assembly, in particular with regard to the preparation (or assembly) of the assembly and / or a smoothing result of the flow lapping process. Furthermore, the object of the invention is to propose a corresponding flow lapping device and a corresponding flow lapping process.

[0007] The problem is solved in particular with the features of claim 1.

[0008] In particular, the object is achieved (according to a first aspect) by an arrangement comprising at least one workpiece (preferably impeller and / or impeller) and a flow lapping device for smoothing at least one surface of the workpiece by means of an abrasive fluid, wherein the flow lapping device has at least one flow guiding device (preferably flow guiding insert) which is adapted to the geometry and / or the flow direction present during operation of at least one workpiece flow channel of the workpiece (in particular in the region of a flow guiding device channel volume which directly adjoins an inner wall of a respective workpiece flow channel).

[0009] A key idea regarding the first aspect is that the workpiece and flow guide device are coordinated with each other with regard to the flow behavior of the fluid. In particular, a flow guide device adapted to the (flow) geometry of a flow channel is proposed. This allows comparatively homogeneous (or constant) flow velocities of the abrasive fluid to be achieved in the respective flow channel, particularly in a transition region between a workpiece flow channel and a flow guide device flow channel.In this context, it was recognized that in the prior art (in particular according to WO 2021 / 099 319 A1) due to the discontinuous transition between the fluid guidance device therein and the workpiece, as disclosed therein, inhomogeneous flow conditions can arise, resulting in unfavorable material removal at least in some sections (for example, too little material is removed in areas where the flow velocity is comparatively low, or removal rates are too high, for example, in areas where the velocity is comparatively high). According to the first aspect, however, a reproducible and comparatively homogeneous (or identical) material removal rate is achieved at different (possibly all) surface areas in the flow channel of the workpiece. This in turn results in reproducible and comparatively homogeneous (orsame) surface roughness results on several (especially all) surface areas in the flow channel of the workpiece.

[0010] In general, an (integrated) flow guide device can be realized that is adapted to the individual flow geometry of a workpiece.

[0011] The following explanations also apply alternatively or additionally to the further aspects of the invention described below.

[0012] The flow direction is preferably a flow direction at the flow inlet and / or at the flow outlet (suction mouth) of at least one workpiece flow channel.

[0013] The flow guide device can be adapted to the (individual) geometry or flow geometry of a flow channel, for example, an open or closed (or partially open and partially closed) impeller (generally: workpiece). Specifically, the flow guide device can be arranged at the so-called suction port (or flow inlet) of the workpiece. A (possibly additional or alternative) flow guide device can be arranged at the flow outlet (or flow outlet) of the workpiece (e.g., the open or closed impeller). In this context, it should be noted that the terms suction port / flow inlet and flow outlet / flow outlet refer to the workpiece during operation.At least if the abrasive fluid can flow in both directions during the flow lapping process, there can be an "exit" and an "input" of the abrasive fluid (whereby the process can, for example, alternate periodically).

[0014] The flow direction present during operation is in particular the flow direction along the inner walls of the respective workpiece flow channel (or adjacent flow guide device flow channel), preferably in one or at a respective channel end that faces the other part (i.e. either the workpiece or the flow guide device). In particular, the flow should continue (continuously) in this transition region. If one compares this, for example, with the fluid insert 33 of WO 2021 / 099 319 A1 (see Fig. 2 there) and the fluid insert 34 according to WO 2021 / 0099 319 A1 (see Fig. 2 there), it can be seen that there - due to the flow channels continuing in a kink-like manner (in cross-section) in the region of the transition from the workpiece to the volume defined by the fluid insert 34 or fluid insert 35 - the respective flow direction orThe flow geometry is not specifically adapted to the workpiece, so that (significant) inhomogeneities in the fluid velocity can occur. This is prevented or at least reduced according to the first aspect.

[0015] A curvature of inner walls of mutually facing channel ends of the flow guide device flow channel and the workpiece flow channel is preferably at least substantially the same.

[0016] A flow guiding device (in particular a flow diverting device or flow steering device) preferably comprises a flow guiding insert or is formed by such a device. A flow guiding insert is understood in particular to be an insert that can be integrated or inserted into the flow lapping device as a separate component. The flow guiding device (or flow guiding insert) preferably does not provide an external seal (although this is possible). The (respective) flow guiding device (or flow guiding insert) can optionally be a one-piece, in particular monolithic, body. The (respective) flow guiding device (flow guiding insert) can be formed at least in sections (possibly completely) from plastic and / or metal and / or glass and / or ceramic.The flow guiding device preferably has at least one flow channel whose cross-section changes (in the flow direction), for example, increases or decreases (optionally increases and decreases in sections). The flow guiding device can have at least two or at least three or at least five flow channels (in particular for each associated workpiece). In this respect, the flow guiding device is in particular a flow-shaping structure. At least one flow channel of the flow guiding device is preferably at least 5 cm, more preferably at least 10 cm, optionally at least 20 cm and / or at most 100 cm long. In particular, the flow guiding device is not a holding plate. The flow guiding device can in particular be present in a shape that deviates from a plate shape.

[0017] An outer wall (and / or outer envelope surface) of the flow-guiding device can have a changing cross-section, for example, widening or tapering (or widening in sections and tapering in sections). A (respective) flow channel and / or an inner wall of a (respective) flow channel of the flow-guiding device can be non-straight, in particular curved, at least in sections.

[0018] Preferably, a cross-section of a (respective) flow channel of the flow-guiding device widens or tapers only slightly (in the flow direction). A cross-sectional area can, for example, increase or decrease by a maximum of 30%, preferably a maximum of 10%, in the flow direction within one (respective) centimeter. A cross-sectional area at one end of a flow-guiding device flow channel can deviate by a maximum of 80%, preferably a maximum of 40%, possibly a maximum of 20%, from the cross-sectional area at the other end of the flow channel. A geometry of the flow channel is preferably not (exactly) conical and / or not (exactly) frustoconical.

[0019] Preferably, the (respective) flow channel of the flow-guiding device is formed by a single-piece (monolithic) body (corresponding to the flow-guiding insert). However, it is also conceivable for a flow channel to be formed by multiple bodies (flow-guiding inserts). The workpiece is preferably an open and / or closed (or partially open and partially closed) impeller, in particular an impeller.

[0020] An outer contour (or envelope surface) of the workpiece can be conical and / or truncated conical, at least in some sections. The outer contour (envelope surface) of the workpiece can widen from one end to the other and / or, at least in some sections, have an inward curvature and / or, at least in some sections, an outward curvature.

[0021] The workpiece can have: an at least substantially round cross-section and / or a (at least partially) cylindrical outer surface and / or at least one, possibly exactly one, central opening, in particular on a base, and / or at least one (preferably several, for example at least two or at least four) radially aligned opening(s), in particular on / at a (at least substantially and at least partially) cylindrical and / or frustoconical outer surface.

[0022] The workpiece is preferably rotationally symmetrical.

[0023] The above-mentioned object is achieved in particular (according to a second aspect) by an arrangement (preferably according to the first aspect) comprising at least one workpiece, preferably impeller and / or impeller, and a flow lapping device for smoothing at least one surface of the workpiece by means of an abrasive fluid, wherein the flow lapping device has at least one flow guiding device, wherein the workpiece has at least one workpiece flow channel, wherein the flow guiding device has at least one flow guiding device flow channel which merges at least in sections, in particular at a shallow angle, into the workpiece flow channel.

[0024] Specifically, a (continuous) flow channel of the flow guidance device can be connected to a channel outlet (or inlet) of the workpiece flow channel.

[0025] According to the second aspect, it is achieved in a simple manner that the inhomogeneities already explained above with regard to the flow behavior (in particular the flow velocities) of the abrasive fluid are compensated or at least reduced.

[0026] A (particularly shallow-angled) transition is understood to mean, in particular, a transition in which there is either an (at least substantially) continuous continuation of adjacent inner wall surfaces of the adjacent flow channels of the workpiece or flow-guiding device, or only a small (kink) angle, in particular of a maximum of 20°, preferably a maximum of 10°, and even more preferably a maximum of 5°. The adjacent inner walls of the flow channels of the workpiece or flow-guiding device can be at least substantially aligned with one another (which does not preclude – more detail below – a slight offset, in particular an offset such that the cross-section of the flow channel of the flow-guiding device is minimally larger than a corresponding cross-section of the flow channel of the workpiece). A corresponding (minimal) step can be less than or equal to 1 mm (more detail below).

[0027] The above-mentioned object is achieved in particular (according to a third aspect, which can preferably be combined with the first and / or second aspect) by an arrangement comprising at least one workpiece, preferably impeller and / or impeller, and a flow lapping device for smoothing at least one surface of the workpiece by means of an abrasive fluid, wherein the flow lapping device comprises a holding device for holding the workpiece, wherein the holding device is (or will be) formed at least partially by at least one flow guiding device, in particular a flow guiding insert.

[0028] A key idea of ​​the third aspect is that a holding device is formed (at least partially, possibly completely) by one or more flow-guiding devices (in particular one or more flow-guiding inserts). This allows the overall structure to be simplified. Preparation or assembly of the arrangement can be simplified (and accelerated compared to the prior art). Overall, this means that comparatively few device parts are required, which also simplifies manufacturing. Furthermore, the arrangement (or the flow lapping device itself) is cheaper to manufacture and / or has a lower susceptibility to failure. Comparatively short setup times and thus lower project costs can be achieved. Suitability for series production can be rated as high.

[0029] The above-mentioned object is achieved in particular (according to a fourth aspect, which is preferably combined with the first and / or second and / or third aspect) by an arrangement comprising at least one workpiece, preferably impeller and / or impeller, and a flow lapping device for smoothing at least one surface of the workpiece by means of an abrasive fluid, wherein the flow lapping device has a holding device, preferably comprising at least one flow guide device, wherein the workpiece is preferably connected to the holding device in a central (or axial) region.

[0030] A key idea of ​​the fourth aspect is that a central mounting of the workpiece is realized. This allows for a simple implementation (especially if the mounting device is designed as or includes a flow-guiding device) of an arrangement that is easy to manufacture and also to prepare (including the integration of the workpiece).

[0031] The connection to the holding device is, in particular, a direct connection. A central region is understood, in particular, to be a region of the workpiece that includes all points on the workpiece that are at most 50% multiplied by X from a center axis of the workpiece, where X is the distance of the farthest point of the workpiece from the center axis. The center axis is preferably an axis of rotational symmetry.

[0032] The connection to the holding device preferably comprises a screw (in particular arranged centrally, preferably on the central axis) and / or a pin (in particular arranged centrally, preferably on the central axis), which can preferably be secured or fastened at its ends by screw connections. Specifically, such a (central) screw or such a (central) pin can penetrate at least the workpiece and one flow guide device, for example, the workpiece and two flow guide devices (in particular at least or exactly one flow guide device on each of two sides of the workpiece).

[0033] Alternatively or in addition to a screw connection, at least one other fastening device can also be used, for example comprising a clamping bracket, possibly non-central, e.g. on the edge, and / or one or more (further) tongue and groove connection(s).

[0034] The workpiece (possibly combined in an assembly with at least one flow guiding device) can rest on a (further) flow guiding device and in particular be supported (and thus positioned) by this from below.

[0035] Further preferred features are described below, which (unless otherwise apparent from the context) can be combined with the first and / or second and / or third and / or fourth aspect.

[0036] According to the embodiment, the workpiece flow channel can widen or narrow in the direction of the flow guide device flow channel (or widen in sections and narrow in sections). Alternatively or additionally, the flow guide device flow channel can widen or narrow in the direction of the workpiece flow channel (or widen in sections and narrow in sections). Preferably, a widening of the workpiece flow channel in the direction of the flow guide device flow channel continues in the flow guide device flow channel. Alternatively or additionally, a narrowing of the workpiece flow channel in the direction of the flow guide device flow channel continues in the flow guide device flow channel.

[0037] In the embodiment, the flow guide device of a flow guide device flow channel is located, at least in sections, at the same height as the workpiece, in particular at the same height as a flow channel of the same. The statement "at the same height" is to be understood in particular that, when the flow lapping device and the workpiece are arranged ready for operation (or in operation), the corresponding structures at least overlap, possibly only overlap, in a side view (i.e., in particular, there are at least sections of the workpiece that are not at the same height as any section of a flow guide device).

[0038] Alternatively or additionally, the flow guide device and the workpiece can be located in the same position, at least when viewed along a respective center axis (axis of rotational symmetry). In particular, the respective center axes (axis of rotational symmetry) of the flow guide device and the workpiece can be (at least substantially) aligned with each other.

[0039] According to the embodiment, the flow guiding device is formed or manufactured in one piece, in particular monolithically and / or by milling and / or by an additive manufacturing process (e.g. laser sintering and / or laser melting).

[0040] Specifically, the flow guide device can be made from a turned-milled part.

[0041] The flow guide device can be made of an abrasion-resistant material, for example based on polyamide, preferably PA6, in particular PA6-G (at least 25% by weight, preferably at least 50% by weight, more preferably at least 90% by weight). The capital letter "G" in this context stands for glass fiber. In general, it can be a fiber-reinforced (in particular glass fiber and / or carbon fiber reinforced) material, preferably plastic, in particular polyamide.

[0042] The flow guide device can be manufactured (in addition to or as an alternative to milling) by additive manufacturing (3D printing), for example laser sintering or laser melting.

[0043] Preferably, at least one section, in particular a section adjacent to a workpiece flow channel, of at least one flow-guiding device flow channel extends at an angle relative to a main flow direction and / or relative to the vertical and / or relative to a main axis (center axis, in particular rotational symmetry axis) of the arrangement (overall arrangement) comprising the flow-guiding device and the workpiece. The (respective) angle is preferably at least 10°, more preferably at least 30°, optionally at least 60° and / or at most 85°. A "main flow direction" is understood in particular to mean a direction of fluid flow through the entire flow-lapping device, if a line is drawn between a first inlet of the flow-lapping device and a second inlet of the flow-lapping device (which, at least with alternating flow directions, can each define an outlet and an inlet).If one of the above-mentioned inlets is at the top and the other at the bottom, the main flow direction in this sense would correspond to the vertical.

[0044] In preferred embodiments, the (respective) flow guiding device has a plurality of flow guiding device flow channels, for example at least 2 or at least 3 or at least 4 or at least 6 or at least 10 and / or at most 30, optionally at most 8, flow guiding device flow channels.

[0045] Alternatively or additionally, the workpiece has a plurality of workpiece flow channels, for example at least 2 or at least 3 or at least 4 or at least 6 or at least 10 and / or at most 30, possibly at most 8.

[0046] Alternatively or additionally, the number of flow guide device flow channels is equal to the number of workpiece flow channels. If the flow guide device interacts with multiple workpieces, this preferably applies to the number of respective associated flow channels (which are in fluid communication with each other).

[0047] Preferably, at least one flow-guiding device flow channel and / or at least one workpiece flow channel is open on at least one circumferential section (of the flow-guiding device or the workpiece). Alternatively or additionally, at least one flow-guiding device flow channel and / or at least one workpiece flow channel is closed on at least one circumferential section (of the flow-guiding device or the workpiece). In general, the (respective) flow channel can be open or closed. A closed channel is understood to be a channel whose (respective) cross-section is completely enclosed by material. In contrast, an open channel is a channel for which this is not the case. An open channel can, for example, have a (at least substantially) U-shaped, V-shaped, or C-shaped cross-section.A closed channel can, for example, be oval (in cross-section), preferably elliptical, more preferably circular and / or polygonal, for example square (possibly with rounded corners).

[0048] Preferably, adjacent cross-sections of at least one workpiece flow channel and at least one flow-guiding device flow channel correspond to one another (particularly with regard to their shape, positioning, and / or size). In general, a holding device for holding the workpiece can be provided, wherein the holding device is preferably formed at least partially (possibly completely) by one (or more) flow-guiding devices, in particular flow-guiding insert(s).

[0049] In embodiments, for example, one flow guiding device (a flow guiding insert) can serve as a support for the workpiece, and another (possibly two) flow guiding device(s) can serve as a positioning and / or clamping means. Specifically, the workpiece can be held between two flow guiding devices (flow guiding inserts) (in particular clamped by them), whereby the entire assembly (workpiece plus two flow guiding devices) can in turn rest on another flow guiding device and be supported by this another flow guiding device (flow guiding insert). This allows for particularly advantageous production and finishing, while simultaneously achieving good smoothing results, in a particularly simple manner (with comparatively few components).

[0050] In embodiments, the (respective or at least one) flow-guiding device (in particular a flow-guiding device arranged at the channel inlet / suction mouth of the workpiece) can be located (at least or only) in sections within at least one workpiece flow channel. Alternatively, the (respective or at least one, possibly all) flow-guiding device(s) can be located (completely outside at least one, in particular all, workpiece flow channels). In one embodiment, a flow-guiding device (forming a screw structure) extends into the workpiece (in particular a receptacle, which is circular according to the embodiment).

[0051] The flow-guiding device can form a helical structure, at least in sections. Alternatively or additionally, the flow-guiding device can form a fan-shaped structure, at least in sections. A helical structure is understood, in particular, to mean a helical course of at least one flow channel. A fan-shaped structure is understood, in particular, to mean a plurality of flow channels extending (fan-like) radially outward (for example, in a straight line or in an arc).

[0052] In general, at least one flow channel of the flow guide device can run radially outwards (straight or curved).

[0053] In embodiments, a plurality of flow guiding devices are provided, preferably at least one flow guiding device at a channel inlet of the workpiece and at least one flow guiding device at a channel outlet of the workpiece.

[0054] In a specific embodiment, a flow guide device is arranged at an inlet of the workpiece, another flow guide device at an outlet of the workpiece, another flow guide device adjacent to the flow guide device at the outlet of the workpiece, and another flow guide device (directly) adjacent to an inner wall of an enclosing device (e.g., housing), which in turn can be formed from two (each one-piece) flow guide inserts. Except for the last flow guide device, all of the flow guide devices mentioned here can be designed as a (one-piece) flow guide insert.

[0055] In general, an internal volume of a housing (an enveloping device or enveloping part) can be filled by one or more flow-guiding devices such that the fluid does not come into contact with an internal surface of the enveloping device or the housing, or only to a comparatively small extent (in particular over a maximum of 20%, preferably a maximum of 10%, even more preferably a maximum of 5% of the internal surface). By filling or "lining" the housing with this type of flow-guiding device(s), the total internal volume through which fluid must flow can be kept comparatively small, which is correspondingly advantageous during operation. This aspect is also hereby disclosed and claimed as an independent aspect of the invention. This aspect can in particular also be combined with the first, second, third, and / or fourth aspects and / or the respective sub-aspects described (in isolation or in combination with the respective main aspect).

[0056] In embodiments, the workpiece and the (respective) flow guide device are secured against rotation relative to each other (e.g., by screwing and / or other anti-rotation means, such as one or more stops or one or more projection-recess pairs). This ensures, in particular, that a (continuous) transition between the respective flow channels is present.

[0057] Preferably, for a diameter Q2 of a flow guide device flow channel that is immediately adjacent to an expanding end of a workpiece flow channel:

[0058] Ql < Q2 < Ql + (Ql-Q).

[0059] Alternatively or additionally, the following applies to a diameter Q2 of a flow guide device flow channel that is immediately adjacent to a tapered end of a workpiece flow channel:

[0060] Ql < Q2 < Ql - (Q-Ql).

[0061] The following applies: Ql = diameter of the workpiece flow channel in the area from its opening to the outside; Q = diameter of the workpiece flow channel at a distance al from its opening to the outside, preferably al = a2, where a2 is the distance between Ql and Q2. The distances al and a2 describe in particular the theoretical position (distance) of the actual diameter Q to Ql or the distance of the diameter to be designed Q2 to Ql. The distances al and a2 can always be the same for the design of Q2, since the cross-sectional profile should preferably be linear and / or non-exponential. The distances al and / or a2 can, for example, be between 2 mm and 10 cm, or possibly between 4 mm and 5 cm.

[0062] Preferably, a channel partition wall of the flow guiding device is thinner than an associated channel partition wall of the workpiece (for example, by at least 0.1 mm or at least 0.2 mm and / or at most 1.0 mm thinner).

[0063] The flow guiding device preferably comprises at least one (or a respective; possibly several or all) flow guiding device(s), in particular at least one (respective) flow guiding insert, at least one adjustable section, in particular at least one adjustable channel partition. As a result, at least one flow channel is preferably adjustable (preferably with respect to a positioning and / or an orientation and / or a shape of the (respective) flow channel). Specifically, the adjustable section (the channel partition) can be rotatable about an axis and / or translationally displaceable. In one embodiment, the adjustable section (the channel partition) is translationally displaceable relative to a rotation axis.This allows for easy use of different workpieces (with different workpiece diameters, different numbers of flow channels, and different channel partition wall properties). This is particularly advantageous for machining prototypes and / or small batches with different channel properties. A set position can be secured, for example, using at least one screw. The screw can also serve as a rotation axis (at least in a loosened or possibly loosened state).

[0064] In embodiments, an opening cross-sectional diameter of a workpiece flow channel is (slightly) smaller than an adjacent cross-sectional diameter of a flow-guiding device flow channel, preferably by at least 0.05 mm, more preferably by at least 0.18 mm and / or by at most 2.0 mm, preferably by at most 1.0 mm, optionally by at most 0.4 mm. One idea of ​​this sub-aspect is to ensure that the opening cross-sectional diameter of the workpiece is never larger than the opening cross-sectional diameter of the associated flow-guiding device flow channel. This can prevent shadowing by the flow-guiding device flow channel from being created in an adjacent region of the workpiece flow channel, which would lead to (incomplete) smoothing in such a shadowed region.This aspect is also hereby disclosed and claimed as an independent aspect of the invention. This aspect may, in particular, also be combined with the first, second, third, and / or fourth aspects and / or the respective sub-aspects described (in isolation or in combination with the respective main aspect).

[0065] The above-mentioned object is also achieved, in particular, by a flow lapping device with the flow lapping device features as described above and / or below. Insofar as features of the workpiece or the arrangement are described, the flow lapping device is particularly configured to interact with the workpiece accordingly and / or to be arranged accordingly relative to the workpiece.

[0066] The above-mentioned object is achieved in particular by a flow lapping device (preferably for the above arrangement) for smoothing at least one surface of at least one workpiece, preferably impeller and / or impeller, by means of an abrasive fluid, comprising at least one, preferably one-piece, flow guide device which is arranged, in particular inserted, within the flow lapping device in order to redirect the fluid within the flow lapping device at least in some regions, wherein the flow guide device has a plurality of, preferably at least three, more preferably at least six, flow guide device flow channels.

[0067] The above-mentioned object is further achieved in particular by a method for smoothing at least one workpiece, comprising the steps:

[0068] Providing the above arrangement; and flowing through, in particular bidirectionally flowing through, the arrangement such that at least one surface of the workpiece, in particular at least one inner surface, is smoothed.

[0069] Preferably, the flow lapping device does not have a holding plate, at least not a holding plate arranged within an enveloping device. Alternatively, the flow lapping device (particularly when multiple workpieces are arranged in a flow lapping device) may have such a holding plate.

[0070] In general, the flow lapping device can have at least one enveloping device (arranged around the workpiece during operation, in particular circumferentially), within which the fluid can flow, wherein (see above) the fluid can only be in direct contact with corresponding flow-guiding inserts in embodiments. In embodiments, the enveloping device can have only one (one-piece, possibly monolithic) enveloping part. The (one) enveloping part can extend over the entire height of a fluid-conducting region within the internal volume of the flow lapping device (or at least over 70% or at least 90% of such an extension). Preferably, the enveloping device (in particular the optionally one enveloping part) is designed to surround the (optionally complete) workpiece, wherein, depending on the embodiment, one or more flow-guiding devices / flow-guiding inserts can also be present between the enveloping device and the workpiece.

[0071] The enclosing device (or enclosing part) can form an annular shell, preferably a hollow cylinder, preferably with a circular or polygonal cross-section, in particular a square one. This ensures effective and simple enclosure or shielding.

[0072] A first closing device can be arranged at a first (in particular lower) end of the enveloping device. The first closing device preferably comprises a first pressure device, which preferably comprises a first (closing and / or pressure) cylinder and / or a first pressure piston (displaceable in the first closing device, in particular the first cylinder). Alternatively or additionally, a second closing device can be arranged at a second (in particular upper) end of the enveloping device. The second closing device preferably comprises a second pressure device, which preferably comprises a second (closing and / or pressure) cylinder and / or a second pressure piston (displaceable in the second closing device, in particular the second cylinder).

[0073] The flow lapping device can optionally have a plurality of workpieces and / or flow guide devices (assigned to the respective workpiece) or flow guide device sets (wherein each set is assigned to a workpiece).

[0074] In embodiments, a flow-guiding device or a set of flow-guiding devices can be assigned to multiple workpieces. Multiple flow-guiding devices or

[0075] Flow control device sets can be assigned to a workpiece.

[0076] In embodiments, the system comprises at least two different, more preferably at least three different flow guiding devices.

[0077] The above-mentioned object is also achieved in particular by a system comprising at least two different flow guide device sets, each of which is individually adapted to a corresponding workpiece, as well as a flow lapping device configured to accommodate each of the different flow guide device sets.

[0078] Such a system (or set) allows for easy adaptation of the flow lapping devices to different applications, especially to different surfaces or workpieces to be smoothed. This increases the variability of the flow lapping device.

[0079] The above-mentioned object is further achieved in particular by a method for assembling the above arrangement and / or the above flow lapping device.

[0080] Further embodiments emerge from the subclaims.

[0081] The invention is described below using exemplary embodiments, which are explained in more detail with reference to the figures. Herein:

[0082] Fig. 1 an oblique view of a workpiece (closed

[0083] impeller);

[0084] Fig. 2 an oblique view of another workpiece (open

[0085] impeller);

[0086] Fig. 3 Side view of the workpiece according to Fig. 2;

[0087] Fig. 4 is a side view of a first flow guiding device with the workpiece according to Fig. 2;

[0088] Fig. 5 the workpiece and the flow guiding device according to Fig.

[0089] 4 in an oblique view;

[0090] Fig. 6 is an oblique view of a second flow guiding device and the workpiece (closed impeller) according to Fig. 1;

[0091] Fig. 7 shows a schematic section of the configuration according to

[0092] Fig. 6 in a schematic sectional view;

[0093] Fig. 8 is a schematic view of a cross section of the

[0094] Workpiece according to Fig. 1 and the second flow guiding device;

[0095] Fig. 9 shows an enlarged section of Fig. 8;

[0096] Fig. 10 shows an enlarged section of Fig. 9;

[0097] Fig. 11 is a schematic representation of a section of a

[0098] flow guide device and a workpiece;

[0099] Fig. 12 shows a schematic cross-section of an assembly comprising two flow guide devices and a workpiece; Fig. 13 shows an alternative assembly in schematic cross-section, comprising a flow guide device and a workpiece;

[0100] Fig. 14 shows an alternative assembly in schematic cross-section, comprising a flow guide device, a workpiece and an adapter;

[0101] Fig. 15 is a schematic sectional view of an arrangement comprising a flow lapping device with a workpiece received therein;

[0102] Fig. 16 is a schematic sectional view of an alternative

[0103] Embodiment of Fig. 15;

[0104] Fig. 17 a cover element in a schematic oblique view;

[0105] Fig. 18 is a schematic sectional view of another

[0106] Embodiment of an arrangement analogous to Fig. 16 with different design;

[0107] Fig. 19a, Fig. 19b a schematic representation of a step for preparing an arrangement comprising a workpiece and a flow lapping device;

[0108] Fig. 20a, Fig. 20b a schematic representation of a further step for preparing an arrangement comprising a workpiece and a flow lapping device;

[0109] Fig. 21a, Fig. 21b a schematic representation of a further step for preparing an arrangement comprising a workpiece and a flow lapping device;

[0110] Fig. 22a, Fig. 22b show a schematic representation of a further step for preparing an assembly comprising a workpiece and a flow lapping device; Fig. 23a, Fig. 23b show a schematic representation of a further step for preparing an assembly comprising a workpiece and a flow lapping device;

[0111] Fig. 24a, Fig. 24b a schematic representation of a further step for preparing an arrangement comprising a workpiece and a flow lapping device;

[0112] Fig. 25a, Fig. 25b a schematic representation of a further step for preparing an arrangement comprising a workpiece and a flow lapping device;

[0113] Fig. 26a, Fig. 26b a schematic representation of a further step for preparing an arrangement comprising a workpiece and a flow lapping device;

[0114] Fig. 27 is a schematic representation of a further step for

[0115] Preparing an arrangement comprising a workpiece and a flow lapping device;

[0116] Fig. 28a, Fig. 28b a schematic representation of a further step for preparing an arrangement comprising a workpiece and a flow lapping device;

[0117] Fig. 29a, Fig. 29b a schematic representation of a further step for preparing an arrangement comprising a workpiece and a flow lapping device;

[0118] Fig. 30a, Fig. 30b a schematic representation of a further step for preparing an arrangement comprising a workpiece and a flow lapping device;

[0119] Fig. 31 a section of the arrangement according to Fig. 16;

[0120] Fig. 32 shows a further section of the arrangement according to Fig. 16; Fig. 33 shows a view of a second flow guide device and the workpiece from above;

[0121] Fig. 34 is an enlargement of a section of Fig. 33; and

[0122] Fig. 35 a schematic cross section of an alternative

[0123] Assembly comprising two flow guide devices and a workpiece.

[0124] In the following description, the same reference numbers are used for identical and equivalent parts.

[0125] Fig. 1 shows an oblique view of a workpiece 10 in the form of a closed impeller. Fig. 2 shows an oblique view of a workpiece 10 in the form of an open impeller.

[0126] The closed impeller shown in Fig. 1 has a plurality of workpiece flow channels 11, each of which has a closed cross-section. Similarly, the open impeller shown in Fig. 2 also has a plurality of channels 11, but here they have an open (roughly U-shaped) cross-section. Individual channels can also branch out (as can be seen in Fig. 2) (although this is purely optional).

[0127] In any case, it can be seen that in the embodiments according to Figs. 1 and 2 the channels run obliquely (relative to a rotational symmetry axis).

[0128] Overall, the geometry of the workpieces according to Fig. 1 and 2 in conjunction with the flow lapping device according to the prior art in the form of WO 2021 / 099 319 A1 leads to a smoothing that is in need of improvement (in certain places).

[0129] It was particularly recognized that the geometries shown in Figs. 1 and 2 (and comparable or similar geometries) lead to (local) imperfections in the case of a free or undirected inflow or outflow into or from the corresponding workpiece flow channels 11. If, for example, one considers the case in which the abrasive fluid flows in from above and flows out radially from below in the arrangement according to Figs. 1 and 2 at a given time (which is symbolized by arrows without reference symbols), this leads to a comparatively low flow velocity of the abrasive grinding medium (fluid) in the regions 12. As a result, a reproducible, homogeneous surface roughness that extends over the surface of the flow channel cannot be achieved in the manufacturing process. In regions 13, in turn, a comparatively high (or too high) material removal results, resulting from an unfavorable (orThe impact angle of the abrasive grinding medium on the surface is too high (or too high). The larger the impact angle α (alpha), the greater the material removal, as shown in Fig. 3. The result is a comparatively high (or too high) flow velocity in the area of ​​the flow deflection.

[0130] Fig. 4 shows a side view of a first flow guiding device 15 (in the form of a flow guiding insert) with the workpiece 10 according to Fig. 2.

[0131] The first flow guide device 15 has a screw structure. A portion 16 of the first flow guide device 15 overlaps (in the vertical direction or in side view) with the workpiece 10.

[0132] As can be seen in particular in Fig. 5, channel partition walls 17 of the first flow guiding device 15 (in particular in the overlapping region 16) lie against channel partition walls 18 of the workpiece 10 or continue them.

[0133] Flow guide device flow channels 19 separated by the channel partition walls 17 continue corresponding workpiece flow channels 11 (continuously or at least substantially without any kink and / or step, although it should already be noted here that at least a minimal step may be present, as explained further below).

[0134] The flow guiding device according to Figs. 4 and 5 is particularly adapted to the (flow) geometry of a suction mouth 21 of the workpiece 10 according to Figs. 4 and 5. As a result, the area 13 of actually excessive material removal is, so to speak, shifted into the flow guiding device 15. There, this is unproblematic because the flow guiding device 15 is merely an aid whose material can be configured such that any material removal is unproblematic or insignificant. As a result, the abrasive fluid (grinding medium) thus enters the (respective) flow channel 11 of the workpiece in the suction mouth flow direction at a comparatively shallow angle. High (or excessive) material removal on the (inner) surfaces of the (respective) flow channel 11 of the workpiece 10 is thus ruled out.

[0135] Fig. 6 shows an oblique view of a second flow guide device 22 and the workpiece 10 (closed impeller) according to Fig. 1. A corresponding second flow guide device can also be used in the embodiment according to Fig. 2. In a similar manner, an at least comparable first flow guide device (having a screw structure), as explained with reference to Figs. 4 and 5, can be used in the embodiment according to Figs. 1 and 6.

[0136] The second flow guide device 22 also has channel partition walls 17, by which the flow guide device flow channels 19 are separated. Here, too, the flow guide device flow channels 19 continue (at least substantially continuously, as explained in detail below) corresponding workpiece flow channels 11. Overall, the design and manufacture of the second flow guide device 22 are adapted to the (flow) geometry of a flow outlet of the workpiece 10 according to Fig. 6. A channel cross-section of the (respective) flow channel 11 of the workpiece 10 is thus continued or continued into the flow guide device 22. This prevents any disruption of the flow velocity of the abrasive grinding medium (fluid). Homogeneous abrasion conditions exist on at least substantially all surface areas of the (respective) flow channel 11 of the workpiece 10.

[0137] Fig. 7 shows a schematic section of the configuration according to Fig. 6 in a schematic sectional view.

[0138] In Fig. 7, points P1, P2, and P3 are identified. Points P1 and P3 lie on an opening edge of the workpiece flow channel 11. Point P3 is the foremost point (relative to a not necessarily straight center line 26 through a center of the flow channel 11 of the workpiece 10, which continues in the flow guide device 22). Point P1 is the rearmost point (on the entire edge of the opening edge, which runs obliquely opposite the center line 26). Point P2, in turn, results from a (straight) line 27 perpendicular to the center line 26, which passes through point P1. Point P2 lies at the point where this line reaches the opposite channel wall. A line 28 is in turn perpendicular to the center line 26 (which continues into the flow guide device 22) and passes through point P3. Point P4 is located at the point on the inner wall of the flow guide device opposite point P3.

[0139] The distance between lines 27 and 28 along center line 26 is defined as a2. Furthermore, a distance a1 is defined between line 27 and a line 29, which runs perpendicular to center line 26 and passes through points P5 and P6 (each arranged opposite each other on the inner wall of workpiece flow channel 11). The length of line (or distance) 29 is hereinafter referred to as Q. The length of line (or distance) 27 is hereinafter referred to as Q1. The length of line (or distance) 28 is hereinafter referred to as Q2. For the channel cross-section that widens as shown in Fig. 7 (from workpiece flow channel 11 toward flow guide device flow channel 19), cross-sectional diameter Q2 is preferably set according to the following condition: Q1 < Q2 < Q1 + (Q1-Q).

[0140] The distances a1 and a2 specifically describe the theoretical position (distance) of the actual diameter Q from Q1, or the distance of the diameter Q2 to be constructed from Q1. The distances a1 and a2 can always be the same for the construction of Q2, since the cross-sectional profile should preferably be linear and / or non-exponential. The distances a1 and / or a2 can, for example, be between 2 mm and 10 cm, or possibly between 4 mm and 5 cm.

[0141] For a decreasing channel cross-section (i.e. exactly the opposite to that shown in Fig. 7), the following preferably applies: Ql < Q2 < Ql - (Ql-Q).

[0142] Preferably, the channel cross-section generally continues linearly into the flow guide device. Fig. 8 shows a schematic view of a cross-section of the workpiece 10 according to Fig. 1 and of the second flow guide device 22. Fig. 9 shows an enlargement of a section from Fig. 8 highlighted by dashed lines. Fig. 10 shows an enlargement of a section from Fig. 9 highlighted by dashed lines.

[0143] As can be clearly seen in particular in Fig. 10, the channel partition wall 17 of the flow guide device 22 is (slightly) thinner than the channel partition wall 18 of the workpiece 10. This results in a minimal offset 23 on both sides of the respective partition walls, for example, of 0.2 mm, so that the channel partition wall 17 is 0.4 mm thinner compared to the channel partition wall 18.

[0144] Preferably, the channel partition walls 17 are aligned rotationally symmetrically with the channel partition walls 18 of the workpiece 10. Furthermore, it is preferred that the respective cross-section (or diameter) of the respective channel partition wall 17 of the flow guide device 22 is smaller and not larger than a respective cross-section (diameter) of the corresponding (assigned) channel partition wall 18 of the workpiece 10. This ensures that the fluid at the channel inlet of the channel outlet or channel inlet of the workpiece 10 is not exposed to any flow shadow. The (respectively present) flow shadow on the surface of the flow guide device 22, in turn, has no negative influence on the smoothing result with respect to the surfaces of the workpiece 10.

[0145] It follows, therefore, that the cross-sections of the (respective) flow channel are particularly important and not (primarily) the thickness of the partition walls. This is relevant, for example, when no partition walls (in the sense of walls separating several channels) are present at the respective location. It is advantageous in this respect if the cross-section of the respective flow channel 19 is larger (for example, by 0.4 mm larger) and not smaller than the cross-section of the respective (assigned) flow channel 11 of the workpiece 10. This ensures that the abrasive fluid does not have a flow shadow at the channel inlet of the channel outlet or channel inlet of the workpiece. The resulting flow shadow on the flow guide device 22, in turn, has no negative influence on the result of the surfaces of the workpiece 10. Corresponding relationships with regard to the flow channels 11, 19 can be seen in Fig.11, where D2 indicates the diameter of the flow channel 19 of the flow guide device 22 and Dl indicates the diameter of the flow channel 11 of the workpiece 10.

[0146] Fig. 12 shows a schematic cross-section of an assembly comprising a first flow guiding device 15, a second flow guiding device 22, and a workpiece 10 arranged therebetween (here designed, for example, as a closed impeller). A rod 70 is arranged axially (centrally) through the flow guiding devices 15, 22 and the workpiece 10 arranged therebetween, which rod positions the three aforementioned elements (15, 10, 22) relative to one another and can be secured, for example, by a screw connection 71 (for example comprising a screw nut and, if applicable, a respective washer). Overall, a rotationally symmetrical alignment of the three elements can be established and this (undesirable) change can be prevented. Specifically, the respective elements can be firmly screwed together to prevent unwanted twisting during processing.Alternatively or additionally, at least one other fastening device can be used, for example comprising a clamping bracket, possibly non-central, e.g. on the edge, and / or one or more (further) tongue and groove connection(s).

[0147] Fig. 13 shows a representation analogous to Fig. 12, wherein here the rod 70 extends through the second flow guide device 22 and the workpiece 10. An optionally present first flow guide device (not shown here) can then be positioned or arranged in a different manner, for example.

[0148] Fig. 14 again shows a representation analogous to Fig. 12, wherein in addition to a second flow guide device 22 (configured differently from Figs. 12 and 13) and a workpiece 10 (configured differently from Figs. 12 and 13), an adapter 72 is traversed by the rod 70. The adapter can have or fulfill one or more of the following functions: Function 1: A fastening with or of the flow guide device 22 and the workpiece, particularly when no flow guide device 15 is used (as an assembly). The adapter can alternatively or additionally serve as a rotation lock.

[0149] Function 2: A truncated cone-shaped upper section can be designed at the angle of the flow direction of the flow channel. This provides a simple way to ensure good fluid flow into the flow channel of the workpiece.

[0150] Function 3: The adapter can be advantageous when no flow guide insert is used and the inner diameter of the workpiece is larger than a possible screw head and / or washer (etc.).

[0151] Fig. 15 shows a schematic sectional view of an arrangement comprising a flow lapping device 100 with a workpiece 10 accommodated therein. Specifically, the workpiece 10 is connected (rotationally secure) to the first flow guide device 15 and the second flow guide device 22, as described with reference to Fig. 12. The corresponding assembly, comprising the workpiece 10 and the flow guide devices 15, 22, in turn rests on a third flow guide device 30. The third flow guide device 30 can be formed in one piece or (particularly to facilitate assembly) can have two third flow guide inserts 31, 32 (as shown by way of example in Fig. 15). Between a cover element 33 and the second flow guide device 22 there is a fourth flow guide device 34, which widens in the direction of the second flow guide device 22.

[0152] The third flow guiding device 30 can in turn rest on a holding device 35 (holding plate). The holding device 35 is in turn accommodated in an enveloping device 36. The specific solution for fastening the holding device 35 to or in the enveloping device 36 can be implemented as described in WO 2021 / 099 319 A1. With regard to this fastening, explicit reference is made to WO 2021 / 099 319 A1. Its content is incorporated by reference into the present application. In any case, however, it should be noted that, particularly due to the different assembly and mounting concept of the embodiment according to Fig. 15, the holding device 35 (or holding plate) can also be omitted, as shown in Fig. 16. The embodiment according to Fig. 16 differs from the embodiment according to Fig. 15 in that no holding plate (as an intermediate plate) is provided, but only a base plate, as described further below.

[0153] Returning to the embodiment according to Fig. 15, the enveloping device 36 comprises a first enveloping part 37 and a second enveloping part 38, which are designed according to WO 2021 / 099 319 A1 and can interact with the holding device 35 (wherein in this regard, the disclosure content of WO 2021 / 099 319 A1 is again to be made part of the present disclosure by reference; this also applies in particular to all concrete embodiments and dimensions of the enveloping device 36 (or the corresponding enveloping parts 37, 38) and the holding device 35 (holding plate)).

[0154] In embodiments according to Fig. 15, on the side of the holding device 35 facing away from the third flow guiding device 30, there is a fifth flow guiding device 39 which, starting from the holding device 35, has a (truncated cone-shaped) widening opening for the passage of the abrasive fluid.

[0155] If one compares Fig. 15 (and in particular also Fig. 16) with, for example, Fig. 7e of WO 2021 / 099 319 A1, it can be seen that the solution proposed in Fig. 15 or Fig. 16 eliminates or can eliminate a whole series of elements present in the prior art, in particular in the language of WO 2021 / 099 319 A1, the first enveloping part there, the first fluid insert there, the second or possibly third enveloping part there, the clamping device there, the tensioning device there, the pipe or the nozzle there, the screw device there, the rods there (designated there with the reference numerals 43 and 45), the spacer extension there, the plug-in devices there (designated there with the reference numerals 47 and 48).

[0156] Fig. 17 shows the cover element 33 according to the embodiment shown in Figs. 15 and 16 in a schematic oblique view. The cover element 33 has an outer ring structure 40 which is connected to an inner central region 41 via webs 42. Openings 48 are located between the webs 42 to allow the passage of abrasive fluid. Through this solution of the cover element 33 (hereby also independently disclosed and claimed as an inventive concept), the abrasive fluid can be guided particularly effectively (in cooperation with the various flow guiding devices) through the flow lapping device 100 or the workpiece 10. This also represents an improvement over the prior art. Through the cover element 33 with the openings 48 arranged in a circle, the abrasive fluid can effectively enter the interior of the flow lapping device. Through at least one (annular) web 43 (see Figs. 15 and 18) in the central section 41 (orBy means of a web 43 (e.g., at one edge thereof), the cover element 33 can be easily positioned relative to the fourth flow guide device 34 and ultimately connected to it. In addition to or as an alternative to the web 43, a corresponding (annular) groove can be formed. Generally, positioning can be achieved via a tongue and groove connection.

[0157] The at least one web 43 serves in particular as a centering device for the fourth flow guiding device 34 and thus (via a web 44 arranged on a side of the fourth flow guiding device 34 opposite the cover element 33 (generally: tongue and groove connection) a centering of the assembly comprising the workpiece 10, and thus also of the workpiece 10 per se.

[0158] The fourth flow guide device 34 preferably represents an advantageous transition between the cover element 33 and the second flow guide device 22. This allows the volume through which the abrasive fluid must flow to be reduced in a simple manner. Furthermore, the fourth flow guide device 34 preferably serves as an adapter between the cover element 33 and the second flow guide device 22.

[0159] As already explained above, a key innovation compared to the prior art are the flow guiding devices 15, 22 which are individually adapted to the workpiece 10 (specifically a first flow guiding device 15 at the channel inlet / suction mouth of the workpiece 10 and a second flow guiding device 22 at a channel outlet of the workpiece 10).

[0160] Due to the comparatively small number of components in the solution shown in Figs. 15, 16, and 18, sources of error can be avoided or at least reduced, manufacturing costs can be reduced, assembly is simplified, setup times are shorter, and series production suitability can be achieved. A comparatively small fluid void volume throughout the entire flow path is advantageous in terms of efficiency considerations. Overall, superior flow characteristics result.

[0161] The embodiment according to Fig. 15 can be used in particular when several workpieces 10 are arranged in a flow lapping device in order to direct the fluid to the outer openings of the corresponding holding device 35 depending on the arrangement of the workpieces. Otherwise, the embodiment according to Fig. 16 is preferred.

[0162] The aforementioned Fig. 18 shows a schematic sectional view of another embodiment of an arrangement analogous to Fig. 16 with a different configuration. The arrangement according to Fig. 18 differs from the arrangement according to Fig. 16 in that in the arrangement according to Fig. 18, the workpiece 10 (open impeller) is arranged according to Fig. 12 and, accordingly, a differently designed first and second flow guide device 15, 22.

[0163] In the embodiment according to Fig. 18, the third flow guide device 30 is in contact with the fluid not only in the region of the first flow guide device 15 (as is also the case in the embodiment according to Figs. 15 and 16), but also in the region of the workpiece 10, namely in the region of its open flow channels.

[0164] The following figures show the individual steps of assembly or preparation of the arrangement according to Fig. 16.

[0165] Fig. 19a shows a schematic oblique view of a base plate 45 for the flow lapping device 100. Fig. 19b shows a corresponding sectional view in a schematic oblique view.

[0166] Fig. 20a shows a component plate 46, which, according to Fig. 20b, is positioned relative to the base plate 45 via a tongue and groove connection 47. The holding device (holding plate) 35 (cf. Fig. 15) can optionally be designed like the component plate 46. According to Fig. 21a, an (at least substantially hollow-cylindrical) enveloping device 36 is also provided, which is placed onto the component plate 46 (cf. Fig. 21b). The third flow-guiding device 30, or a flow-guiding insert 32 thereof (specifically onto the component plate 46), is in turn inserted into the enveloping device 36 (cf. Figs. 22a, 22b).

[0167] Subsequently (and / or before and / or in parallel), the assembly can be prepared according to Fig. 12. For this purpose, the second flow guide device 22 is first prepared according to Fig. 23a (as shown in the corresponding side view in Fig. 23b). The workpiece 10 can then be placed onto the flow guide device 22 (see Figs. 24a and 24b). In a next step, the first flow guide device 15 can be placed (or partially inserted) onto the workpiece 10 (cf. Figs. 25a, 25b). The two flow guide devices 15, 22 and the workpiece 10 can then be connected to one another (as already explained with reference to Fig. 12) via a rod 70 with a corresponding screw connection 71 (see Figs. 26a, 26b).

[0168] The entire assembly according to Fig. 12 or Figures 26a, 26b can then be placed on the third flow guiding device 30 (or the flow guiding insert 32 thereof) according to Fig. 27.

[0169] The fourth flow guide device 34 shown in Fig. 28a can then be placed on the second flow guide device 22 (see Fig. 28b).

[0170] In a next step, the further flow guide insert 31 of the third flow guide device 30 shown in Fig. 29a can be placed on the already inserted flow guide insert 32 of the third flow guide device 30 (see Fig. 29b).

[0171] The cover element 33 shown in Fig. 30a can then be placed onto the enveloping device 36 or the fourth flow guiding device 34.

[0172] The arrangement according to Fig. 16 is thus prepared.

[0173] Fig. 31 shows a schematic section A of the arrangement according to Fig. 16 (see there: A). Specifically, the interface between component plate 46 and enveloping device 36 can be seen. It can be seen that the enveloping device 36 rests on an edge 50 of the component plate 46 via an (internal) corner recess 47. The component plate 46 is in turn fixedly connected to the base plate 45 via the aforementioned tongue and groove connection 47 (shown only in sections in Fig. 31). The tongue and groove connection can comprise a corner recess 49a and an edge 49b.

[0174] Fig. 32 shows a schematic section B of the arrangement according to Fig. 16 (see there: B) in the region of an interface between the wrapping device 36 and the cover element 33. Specifically, here an upper edge of the wrapping device 36 is in engagement with the cover element 33 via a tongue and groove connection 60.

[0175] Fig. 33 shows a second flow guiding device 22 and a workpiece 10 in a top view. The section highlighted by dashed lines in Fig. 33 is shown enlarged (and with further details) in Fig. 34. Specifically, Fig. 34 shows a channel partition 17 which is pivotable on the one hand, as symbolized by arrow 80, and translationally displaceable on the other hand, as symbolized by arrow 81. Specifically, the channel partition 17 according to Fig. 34 can be pivotable about an axis 82, wherein the channel partition 17 is additionally translationally displaceable relative to this axis 82. A corresponding elongated hole 83 can be provided for this purpose.

[0176] The embodiment according to Figs. 33 and 34 is an example of the fact that the (respective) flow guiding device (or the corresponding flow guiding insert) does not necessarily have to be formed in one piece (monolithic).

[0177] In general, it is possible to arrange a channel partition wall that is adjustable in terms of angle and distance on a base surface 84 (see Fig. 33) of the flow guide device 22. The channel partition wall 17 can be (firmly) screwed to the base surface 84.

[0178] Such a flow guiding device can be used for machining different workpieces (in particular impellers), in particular with different workpiece diameters and / or different numbers of flow channels and / or with different channel partition wall properties, in particular by mounting different sizes of channel partition walls and / or by adjusting a corresponding channel partition wall to the material properties.

[0179] This allows for suitable solutions, especially for prototypes and small batches with different channel properties, since the manufacturing effort of a possibly monolithic flow guide device is not always worthwhile in these cases. Such a version can save manufacturing costs, time, and resources. For serial production, a one-piece (monolithic) flow guide device may be more suitable, particularly due to its durability and / or a fixed and / or non-adjustable channel partition(s).

[0180] The axis 82 can be formed at least partially by a screw, so that both rotation and locking are possible in a simple manner.

[0181] Fig. 35 shows a schematic cross-section of an alternative assembly, comprising two flow-guiding devices 15, 22 and a workpiece 10, in a view similar to Figures 12-14. Screwing as in Figures 12 to 14 can be omitted. Assembly of the assembly can, for example, involve clamping and / or plugging. For this purpose, corresponding structures can already be provided in the respective flow-guiding device and / or in the workpiece. The assembly can also be held together alternatively or additionally by additional parts, or solely by arranging the assembly within the remaining parts of the fluid device. A clamping device 90 is shown purely schematically and by way of example for clamping the workpiece 10 to the flow-guiding device 22.

[0182] At this point, it should be noted that all parts described above, viewed individually and in any combination, particularly the details shown in the drawings, are claimed as essential to the invention. Modifications to these are familiar to those skilled in the art.

[0183] Furthermore, it is pointed out that the broadest possible scope of protection is sought. In this respect, the disclosure contained in the claims can also be clarified by features that are described with further features (even without these further features being mandatory). It is explicitly pointed out that parentheses and the term "in particular" are intended to emphasize the optionality of features in the respective context (which does not mean, conversely, that without such identification, a feature is to be considered mandatory in the corresponding context). The term "element / elements" should preferably characterize a coherent structure, which in turn can be connected to at least one other structure (to form a possibly integral and / or inherently immobile overall structure) or can be delimited from all other structures. al distance a2 distance

[0184] P1-P6 point

[0185] Q Extension

[0186] Ql extension

[0187] Q2 extension

[0188] 10 Workpiece

[0189] 11 Workpiece flow channel

[0190] 12 Area

[0191] 13 Area

[0192] 15 first flow guide device

[0193] 16 Overlap area (section of the first flow guide device)

[0194] 17 Channel partition wall (a flow control device)

[0195] 18 Channel partition wall (of a workpiece)

[0196] 19 Flow guide device flow channel

[0197] 21 Suction mouth

[0198] 22 second flow guide device

[0199] 23 Offset

[0200] 26 Center line

[0201] 27 to the center line 26 vertical line

[0202] 28 to the center line 26 vertical line

[0203] 29 to the center line 26 vertical line

[0204] 30 third flow guide device

[0205] 31, 32 third flow guide inserts 33 cover element 34 fourth flow guide device 35 holding device (holding plate) 36 enveloping device 37 first enveloping part 38 second enveloping part 39 fifth flow guide device 40 outer ring structure 41 central section 42 web 43 web 44 web 45 base plate 46 component plate

[0206] 47 Tongue and groove connection 48 Opening 49a Corner recess 49b Edge 50 Edge 60 Tongue and groove connection 70 Rod 71 Screw connection 72 Adapter 80 Arrow 81 Arrow 82 Axis (screw) 83 Slotted hole 84 Base area

[0207] 90 Clamping device 100 Flow lapping device

Claims

Claims 1. Arrangement comprising at least one workpiece (10), preferably impeller and / or impeller, and a flow lapping device (100) for smoothing at least one surface of the workpiece (10) by means of an abrasive fluid, wherein the flow lapping device (100) has at least one flow guide device (15) which is adapted to the geometry and the flow direction present during operation of at least one workpiece flow channel (11) of the workpiece (10).

2. Arrangement, in particular according to claim 1, comprising at least one workpiece (10), preferably impeller and / or impeller, and a flow lapping device (100) for smoothing at least one surface of the workpiece (10) by means of an abrasive fluid, wherein the flow lapping device (100) has at least one flow guide device (15, 22), wherein the workpiece (10) has at least one workpiece flow channel (11), wherein the flow guide device (15, 22) has at least one flow guide device flow channel (19) which merges at least in sections, in particular at a shallow angle, into the workpiece flow channel (11).

3. Arrangement, in particular according to one of the preceding claims, comprising at least one workpiece (10), preferably impeller and / or impeller, and a flow lapping device (100) for smoothing at least one surface of the workpiece (10) by means of an abrasive fluid, wherein the flow lapping device (100) comprises a holding device for holding the workpiece, wherein the holding device is formed at least partially by at least one flow guiding device (15, 22), in particular a flow guiding insert.

4. Arrangement, in particular according to one of the preceding claims, comprising at least one workpiece (10), preferably impeller and / or impeller, and a flow lapping device (100) for smoothing at least one surface of the workpiece (10) by means of an abrasive fluid, wherein the flow lapping device (100) has a holding device, preferably comprising at least one flow guide device (15, 22), wherein the workpiece (10) is connected to the holding device in a central and / or axial region.

5. Arrangement according to one of the preceding claims, wherein the workpiece flow channel (11) widens or tapers in the direction of the flow guide device flow channel (19), and / or wherein the flow guide device flow channel widens or tapers in the direction of the workpiece flow channel, wherein a widening of the workpiece flow channel in the direction of the flow guide device flow channel preferably continues in the flow guide device flow channel or a taper of the workpiece flow channel in the direction of the flow guide device flow channel preferably continues in the flow guide device flow channel.

6. Arrangement according to one of the preceding claims, wherein the flow guiding device (15, 22), in particular at least a section of a flow guiding device flow channel (19) thereof, is located at least in sections at the same height as the workpiece (10), in particular a flow channel (11) thereof.

7. Arrangement according to one of the preceding claims, wherein the flow guiding device (15, 22) is formed in one piece, in particular monolithically, preferably by milling and / or by an additive manufacturing process.

8. Arrangement according to one of the preceding claims, wherein the flow guiding device (15, 22) has a plurality of flow guiding device flow channels (19), for example at least three or at least six flow guiding device flow channels, and / or wherein the workpiece (10) has a plurality of workpiece flow channels (11), for example at least three or at least six workpiece flow channels, and / or wherein the number of flow guiding device flow channels is equal to the number of workpiece flow channels.

9. Arrangement according to one of the preceding claims, wherein the flow guiding device (15, 22) is located in sections within at least one workpiece flow channel.

10. Arrangement according to one of the preceding claims, wherein the flow guiding device (15) forms a screw structure at least in sections and / or wherein the flow guiding device (22) forms a fan structure at least in sections.

11. Arrangement according to one of the preceding claims, wherein a channel partition wall (17) of the flow guiding device (15, 22) is thinner than an associated channel partition wall (17) of the workpiece (10).

12. Arrangement according to one of the preceding claims, wherein at least one flow guiding device, in particular at least one flow guiding insert, has at least one adjustable section, in particular at least one adjustable channel partition wall, such that at least one flow channel is adjustable, preferably with respect to a positioning and / or an alignment and / or a shape thereof.

13. Arrangement according to one of the preceding claims, wherein an opening cross-sectional diameter of a workpiece flow channel (11) is slightly smaller than an adjacent cross-sectional diameter of a flow guide device flow channel (19), preferably by at least 0.05 mm, more preferably by at least 0.18 mm and / or by at most 2.0 mm, preferably by at most 1.0 mm, optionally by at most 0.4 mm.

14. Flow lapping device (100), in particular for an arrangement according to one of the preceding claims, for smoothing at least one surface of at least one workpiece (10), preferably an impeller and / or impeller, by means of an abrasive fluid, comprising at least one, preferably one-piece, flow guide device (15, 22) which is arranged, in particular inserted, within the flow lapping device (100) in order to redirect the fluid within the flow lapping device (100) at least in regions, wherein the flow guide device has a plurality of, preferably at least three, more preferably at least six, flow guide device flow channels (19).

15. A method for smoothing at least one workpiece, comprising the steps: - Providing an arrangement according to one of the preceding claims; - Flowing through, in particular bi-directionally flowing through, the arrangement in such a way that at least one surface of the workpiece (10), in particular at least one inner surface, is smoothed.

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