EP2422883B1 - Procédé de fabrication d'une buse haute pression - Google Patents

Procédé de fabrication d'une buse haute pression Download PDF

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Publication number
EP2422883B1
EP2422883B1 EP11188268.4A EP11188268A EP2422883B1 EP 2422883 B1 EP2422883 B1 EP 2422883B1 EP 11188268 A EP11188268 A EP 11188268A EP 2422883 B1 EP2422883 B1 EP 2422883B1
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EP
European Patent Office
Prior art keywords
filter
section
longitudinal axis
jet
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11188268.4A
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German (de)
English (en)
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EP2422883A2 (fr
EP2422883A3 (fr
Inventor
Albert Fecht
Jürgen Frick
Boris Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lechler GmbH
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Lechler GmbH
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Publication date
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Priority to PL11188268T priority Critical patent/PL2422883T3/pl
Publication of EP2422883A2 publication Critical patent/EP2422883A2/fr
Publication of EP2422883A3 publication Critical patent/EP2422883A3/fr
Application granted granted Critical
Publication of EP2422883B1 publication Critical patent/EP2422883B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/042—Outlets having two planes of symmetry perpendicular to each other, one of them defining the plane of the jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3402—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to avoid or to reduce turbulencies, e.g. comprising fluid flow straightening means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/40—Filters located upstream of the spraying outlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F5/106—Tube or ring forms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49428—Gas and water specific plumbing component making
    • Y10T29/49432—Nozzle making
    • Y10T29/49433—Sprayer

Definitions

  • a high-pressure nozzle for descaling steel products which has a jet funnel within a feed channel to an outlet opening.
  • the jet straightener is constructed as a star-like component in cross-section and has a cylindrical central part, from which radially flow guide surfaces extend.
  • the cylindrical central part is extended both in the upstream direction and in the downstream direction in the form of a conical tip.
  • a filter is arranged, which is formed from a pipe section with a spherical cap-shaped end and is provided with radial cuts for the entry of liquid. The radial cuts extend into the spherical section cap of the filter.
  • a gradual taper of the flow channel is provided, which decreases as the taper angle decreases
  • Exit chamber extends in a mouthpiece.
  • the mouthpiece has the outlet chamber and the outlet opening adjoining the outlet chamber. Due to the very high liquid pressures with which high-pressure nozzles are operated for descaling steel products and which can be several 100 bar to 600 bar, a low flow resistance is crucial because pressure losses within the high-pressure nozzle either to a lower removal or to the requirement of a higher pressure Feed the supply line. In addition, the shape of the flat jet generated is crucial, which should have the smallest possible width to achieve the best possible removal effect. Finally, the high-pressure nozzle is exposed to considerable mechanical loads, since, for example, pressure surges in the supply line can lead to collapse of the filter of the high-pressure nozzle.
  • the patent US 4,848,672 describes a high-pressure nozzle for descaling steel products, in which a nozzle tip can be made of sintered cemented carbide.
  • the nozzle mouthpiece is surrounded at its radially outer periphery by a nozzle housing.
  • the high-pressure nozzle has a filter and a jet funnel upstream of the nozzle tip.
  • the filter and the jet straightener are designed as separate components, the filter component being connected by means of a screw connection to a tubular nozzle housing into which the jet straightener is then also inserted concentrically.
  • an improved method for producing a high-pressure nozzle is to be provided.
  • the problem underlying the invention is solved by a method for producing a high-pressure nozzle for descaling steel products, in which the following steps are provided: mixing metal powder with plastic binder, Injection molding the resulting mixture into a mold Removal of the binder by chemical and / or thermal processes and Sintering the pre-product obtained after removal of the binder, the high-pressure nozzle having at least one filter and a jet director in a combined filter and jet straightener component composed of at least two separate parts, whereby the individual parts are intimately connected together by co-sintering.
  • Sintered components are realized by the metal powder injection molding and it is to be expected at first that sintered components have a rather brittle character and therefore for loads with extreme pressure peaks, as they occur in the operation of Entzu mattersdüsen, are not suitable. Experiments have surprisingly shown that obtained by metal powder injection molding sintered parts with appropriate design can withstand these stresses and also offer new opportunities for flow optimization of high-pressure nozzles.
  • individual parts present as precursors are assembled after removal of the binder, and then the assembled primary products are sintered.
  • components can be produced in one piece, for example, a combined Strahlrichter- and filter component including filter cap, since after sintering, the assembled precursors are permanently connected to each other. This results in even more options for the simultaneous stable and aerodynamic design of high-pressure nozzles.
  • a combined Strahlrichter- and filter component including filter cap since after sintering, the assembled precursors are permanently connected to each other.
  • the metal powder contains at least partially hard metal powder.
  • the high-pressure nozzle in particular for descaling steel products, can be provided with a jet straightener within a feed channel to an outlet opening, wherein the jet straightener has a free flow cross-section in a region directly surrounding the central longitudinal axis of the feed channel.
  • the jet straightener therefore has a flow channel immediately surrounding the central longitudinal axis without internals.
  • the jet straightener according to the invention has a significantly reduced flow resistance, as the flow channel immediately surrounding the central longitudinal axis of the feed channel remains free and can be used for unimpeded flow. Since the free cross-section available for the flow is considerably larger, a significant reduction of the flow resistance is achieved.
  • the free flow cross section may, for example, have a radius which is about 1/5 of the inner radius of the jet director.
  • the jet straightener can have flow guide surfaces which extend parallel to the central longitudinal axis of the feed channel and onto the central longitudinal axis.
  • the flow guide surfaces may extend radially in the direction of the central longitudinal axis.
  • planar flow guide can be realized, which have a very good alignment effect with low flow resistance.
  • a taper of the feed channel Downstream of the jet director, a taper of the feed channel can be provided.
  • the flow can be concentrated and the flow channel can be brought together in a short path to the cross section of the outlet chamber.
  • a short taper is provided and the tapered portion of the feed channel has only about half to one third of the length of the beam director.
  • the taper can be followed downstream of the jet director by a section of constant cross-section which merges into a tapered discharge chamber.
  • the section of constant cross section is advantageously longer than the taper after the jet director. It has proven to be advantageous make the section of constant cross-section at least twice as long as the taper after the jet director and in particular seven times as long as the taper.
  • the outlet chamber merges into the outlet opening, from which the spray jet then emerges.
  • a filter Upstream of the jet straightener, a filter may be arranged, which has radially aligned with the central longitudinal axis entry slots.
  • the entry slots advantageously extend parallel to the central longitudinal axis.
  • the filter may have a spherical segment-shaped filter cap which has inlet openings which extend parallel to the central longitudinal axis.
  • the inlet openings in the spherical segment-shaped filter cap are separated from the inlet slots of the filter, so that the spherical segment-shaped filter cap can be made very stable and in particular can withstand any pressure surges occurring in the supply lines.
  • the filter cap has a circumferential collar, which ensures high mechanical strength.
  • the inlet slots in the filter thus end in front of the spherical segment-shaped filter cap.
  • Endbegrenzungs vom the entry slots which are on the side of the beam director, may be rounded or obliquely inwardly leading formed, the rounded Endbegrenzungs vom are formed to be convex in the direction of the central longitudinal axis.
  • the respective slot bottom of the entry slots which, viewed in the direction of flow, lies on the side of the beam director, is thus arched outwardly or convexly in the direction of the central longitudinal axis.
  • the slot base is inclined inwards and, in particular, has a cone-shaped jacket-shaped section, with the cone then tapering in the direction of flow.
  • the flow through the inlet slots gradually in the region of the slot bottom in the direction the center longitudinal axis deflected.
  • a vortex formation in the region of the slot bottom is considerably reduced and a low flow resistance and a flow oriented substantially parallel to the central longitudinal axis downstream of the jet director are achieved.
  • the filter can be formed by means of a filter cap and a filter main part, wherein the filter cap and the main body are made as individual parts and then connected to each other inextricably.
  • the filter cap and filter body may be made by metal powder injection molding and then sintered together.
  • Metal powder injection molding can also be used to realize geometrically complicated shapes which could not be realized by mechanical machining or only with considerable effort. This includes, for example, aligned with the central longitudinal axis, convex formation of the end faces of the inlet slots of the filter. Typically, such entry slots are formed by dipping a mill or saw blade into a tubular member. This then usually results in an outwardly directed, concave configuration of the end faces, which is unfavorable in terms of flow.
  • the main filter part has the jet straightener.
  • the soulless beam director according to the invention and a streamlined design of the entry slots on the filter can be realized and produced in a series production.
  • the jet straightener can also be designed as a separate flow channel component or be integrated into another component of the nozzle as the filter.
  • the filter cap may have a circumferential collar with radially inwardly extending projections, wherein the projections engage in matching recesses of the filter body.
  • the filter body may be provided with a circumferential collar having radially inwardly or outwardly extending projections, the projections then engaging mating recesses of the filter cap. Regardless of whether the circumferential collar is provided with radially extending projections on the filter cap or the main filter part, the advantages of the invention a very stable and aerodynamic design of the connection between the filter cap and filter main part can be realized.
  • the filter main part may have at its, the filter cap adjacent end parallel to the central longitudinal axis extending webs, between which the recesses are formed.
  • the entry slots are formed between the webs of the main filter part.
  • the filter body can accordingly distributed over its circumference, a plurality of extending in the upstream direction of the fingers or webs, between which the entry slots are formed. The ends of these webs are received and fixed by the filter cap. After this permanent connection of filter main body and filter cap creates a stable component.
  • Particularly advantageous filter cap and filter body can be made by means of metal injection molding and then sintered together.
  • the perspective, cut view of the Fig. 1 shows a high-pressure nozzle 10 according to the invention for the descaling of steel products.
  • the high-pressure nozzle 10 is installed in a tubular connection nipple 12 and secured in this tubular connection nipple 12 by means of a union nut 14.
  • the high-pressure nozzle 10 itself has a combined filter and Strahlrichterbauteil 16 which is screwed into a nozzle housing 18.
  • a mouthpiece 20 is inserted, which defines an outlet opening 22 at its downstream end.
  • the tubular connection nipple 12 is connected to a nozzle bar, not shown, in which a filter 24 of the high-pressure nozzle 10 projects.
  • the mouthpiece 20 is sealed against the nozzle housing 18 by means of a circumferential metal solder seam 28.
  • the jet straightener 26 leaves open a flow channel directly surrounding a central longitudinal axis 30 of the high-pressure nozzle 10. In the area of the beam director 26, a flow channel immediately surrounding the central longitudinal axis 30 is thus present without any internals.
  • the jet straightener 26 has a plurality of flow guide surfaces extending radially in the direction of the central longitudinal axis 30, which are planar and aligned parallel to the central longitudinal axis 30.
  • the liquid entering the filter 24 can be aligned parallel to the central longitudinal axis 30.
  • the plurality of flow guide of the jet director 26 are only attached to the outer periphery of the jet director and protrude freely in the direction of the central longitudinal axis 30 surrounding the flow channel.
  • Fig. 2 In the sectional view of Fig. 2 can be seen two opposing flow control of the beam director 26 through which the cutting plane is laid.
  • the filter 24 Upstream of the jet director 26, the filter 24 is arranged, which is formed from a circular cylindrical tube section with radially extending to the central longitudinal axis 30 entry slots and which is provided with a spherical segment-shaped filter cap.
  • a conically tapered section 32 connects, which merges into a circular cylindrical section 34 with a constant diameter.
  • the tapered section 32 is shorter than the beam straightener 26 and has about 1/3 to 1/2 of the length of the beam director 26.
  • the section 34 with constant In contrast, the cross-section downstream of the tapered portion 32 is both significantly longer than the beam director 26 and significantly longer than the tapered portion 32.
  • the constant cross-section 34 is about three times as long as the jet director 26 and has about seven times the length of the tapered section 32. It has been found that such a dimensioning of the lengths of jet straightener 26, the taper 32 and the section 34 with constant cross-section can set flow conditions that favor an exact formation of an exiting flat jet 36.
  • the outlet chamber 38 Downstream of the constant diameter section 34 is an exit chamber 38 in the mouthpiece 20.
  • the outlet chamber 38 tapers conically and ends at the outlet opening.
  • the length of the exit chamber 38 is about half the length of the jet director 26 and significantly less than the length of the section 34 of constant cross section.
  • the length of the outlet chamber 38 is approximately on the order of the taper 32 immediately downstream of the Strahlrichters 26th
  • a free flow channel available to the flow is thus tapered in a relatively short path in two stages, namely once through the tapered section 32 immediately downstream of the jet director 26 and then also in a comparatively short way by means of the tapering exit chamber 38. It has been found that such a two-stage, respectively relatively strong constriction of the flow channel in a short way flow is cheaper than a very gradual taper over a long way.
  • the available free cross-section is relatively strongly constricted by means of the section 32 in the short path, but in the course of the long section 34 with constant cross-section, the flow can calm down again, and then very evenly enter the outlet chamber 38.
  • the largest free flow cross section is in the region of the filter 24 and is determined by the sum of the free cross sections of the elongate filter slots and the other filter slots in the filter cap.
  • An already significantly reduced flow cross-section is present in the region of the jet director 26, wherein the free flow cross-section there results from the cross section of the total channel minus the end faces of the star-shaped flow guide surfaces.
  • a ratio of the free flow cross-sectional area on the jet straightener 26 to the free flow cross-sectional area of the filter 24 is advantageously 1: 6 or greater.
  • a further narrowing of the flow cross-section takes place after the jet straightener 26 on the cross section of the channel 27, which is guided with a constant cross section to the mouthpiece 12.
  • a ratio of the free flow cross-sectional area in the channel 37 to the free flow cross-sectional area on the jet straightener 26 is advantageously 1: 1.23 or greater.
  • a ratio of the free flow cross-sectional area in the channel 37 to the free flow cross-sectional area of the filter 24 is advantageously 1: 7.44 or greater.
  • the free flow cross-sectional area in the channel 37 is, for example, 95 mm 2
  • the free flow cross-sectional area on the filter 24 is for example 707 mm 2 .
  • a Metalllotnaht 28 is provided between an inner edge of the nozzle housing 14 and an annular end face of the mouthpiece 12, which seals the mouthpiece 12 against the nozzle housing 14.
  • FIG. 3 shows the combined Strahlrichter- and filter component 16 of the high-pressure nozzle 10 of Fig. 1 .
  • the component 16 consists of a total of three individual parts which are permanently connected to each other, namely a filter cap 40, a filter main part 42, which also has the jet funnel 26, and a conduit part 44, the tapered portion 32 downstream of the Strahlrichters 26 and the section 34 having a constant cross section 34.
  • the conduit part 44 is provided with an external thread 46 with which the conduit part 44 is screwed into the nozzle housing 18.
  • the filter cap 40 is designed in the form of a spherical segment and has inlet openings 48 extending parallel to the central longitudinal axis 30.
  • the inlet openings 48 are arranged in a star shape on the filter cap 40.
  • the filter main part 42 has a plurality of webs 50 extending parallel to the central longitudinal axis 30 and spaced uniformly around their circumference. Between the webs 50 remain entry slots through which liquid can enter the filter 24.
  • downstream end faces 52 of the entry slots are rounded and curved in the direction of the central longitudinal axis 30 to be convex. Liquid entering through the entry slots is thereby gradually deflected in the direction of the central longitudinal axis 30 in the area of the downstream end faces of the entry slots. As a result, a vortex formation in the region of the end faces 52 is kept low and a low flow resistance with uniform flow can be achieved.
  • the filter cap 40, the main filter part 42 with the jet straightener 26 and the conduit part 44 are manufactured as individual parts by means of metal injection molding and then put together after removal of a thermoplastic binder, as individual precursors and then sintered. After sintering, the filter cap 40, the main filter part 42 and the conduit part 44 are permanently connected to each other and form the heavy-duty combined Strahlrichter- and filter component 16.
  • the preparation by means of metal powder injection molding will be explained in detail.
  • Fig. 4 shows in a perspective view the main filter part 42 of Fig. 3 , Dashed lines indicate details that are not recognizable in and of themselves, such as the radially directed flow guide surfaces 54 and concealed entry slots between the webs 50.
  • the webs 50 are formed at their upstream end with reduced thickness so that each web 50 has a step 58, which serves as a stop when sliding the filter cap 40, as well as in the side view of Fig. 5 can be seen.
  • FIG. 6 The view of Fig. 6 in the direction of the arrow VI Fig. 5 shows the radially extending in the direction of the central longitudinal axis flow guide surfaces 54 of the jet director, which leave the flow channel 56 around the central longitudinal axis 30 around.
  • the flow guide surfaces 54 are only connected at their radially outer end to the inner wall of the main filter part 42 and protrude freely in the direction of the central longitudinal axis.
  • the flow guide surfaces 54 are comparative leave the same large cross-section and cause only a small flow resistance despite very good alignment effect. All, projecting into the flow edges of the flow guide 54 are rounded.
  • the presentation of the Fig. 7 shows a view of the filter main part 42 in the direction of arrow VII of Fig. 5 , Good to see the free ends of the webs 50, each with a paragraph 58.
  • the webs 50 leave between them entry slots free to extend radially in the direction of the central longitudinal axis and can enter through the liquid in the interior of the filter body 42.
  • the number of slots between the webs 50 is greater than the number of flow baffles.
  • there are eight flow guide surfaces 54 and fourteen inlet slots which are distributed uniformly over the circumference of the main filter part 42.
  • the sectional view of the filter main part 42 in FIG Fig. 8 on the cutting plane VIII-VIII of the Fig. 5 allows the rounded formation of the end faces 52 of the entry slots between the webs 50 of the filter 24 to recognize.
  • the end faces 52 of the entry slots are curved and, in particular, the sectional view of Fig. 11 on the cutting plane XI-XI the Fig. 10 can be seen, viewed in the direction of the central longitudinal axis 30 convex.
  • the transitions between the end faces 52 and the lateral boundaries of the webs 50, which define the entry slots, rounded, as well especially in the enlarged detail of the Fig. 9 can be seen.
  • the liquid entering through the entry slots is thereby deflected in the direction of the central longitudinal axis 30 with little vortex formation and thus low flow losses.
  • the free edges of the flow guide surfaces 54 of the Strahlrichters 26, such as Fig. 11 and also 6 and 7 can be seen.
  • the presentation of the Fig. 12 shows the filter cap 40 in a side view.
  • the filter cap 40 is substantially spherical segment-shaped and has star-shaped around the central longitudinal axis 30 arranged inlet openings 48, which extend parallel to the central longitudinal axis 30. Liquid can enter through the inlet openings 48 into the interior of the filter and is already aligned with the inlet approximately parallel to the central longitudinal axis 30.
  • the filter cap 40 has an indexing slot 60, which facilitates the correct angle placing the filter cap 40 on the main filter part 42.
  • the presentation of the Fig. 13 shows a view of the filter cap 40 along the arrow XIII of Fig. 12 ,
  • the filter cap 40 has a circumferential collar 62 with a plurality of projections 64 extending radially in the direction of the central longitudinal axis 30.
  • Recesses 66 which are provided for receiving the free ends of the webs 50 of the main filter part 42, are respectively formed between the projections 64.
  • the thickness of the webs 50 corresponds to the wall thickness of the filter cap 40 and thus the radial dimension of the projections 64 plus the thickness of the collar 62, so the length of the outer wall of the filter cap 40 to the inner wall in the region of a projection 64.
  • the free ends of the webs 50 are reduced in thickness.
  • the filter cap 40 When placing the filter cap 40 therefore engage the free ends 59 in the recesses 66 and the free ends 59 are matched to the dimensions of the recesses 66, that an inner wall of the webs 50 in the pushed state of the cap 40 in alignment with the inner wall of the filter cap 40th runs.
  • the filter cap 40 is pushed so far until the peripheral collar 62 rests with its lower edge on the shoulder 58 of the filter body 42.
  • both the filter cap 40 and the main filter part 42 are produced by metal injection molding and sintered after debindering in the assembled state.
  • the filter cap 40 and the main filter part 42 connect inextricably and also after the plugging still existing narrow joints are filled, so that after sintering a one-piece and substantially seamless component is obtained.
  • FIG. 14 represents a sectional view on the cutting plane XIV-XIV of Fig. 13 and Fig. 15 represents a sectional view on the section plane XV-XV of Fig. 13 represents.
  • FIGS. 14 and 15 It can be seen that the wall thickness of the filter cap 40 gradually decreases from the collar 62 in the direction of its vertex, ie the intersection of the central longitudinal axis 30 with the wall of the filter cap 40.
  • the length of the entry slots 48 parallel to the central longitudinal axis 30 are kept as short as possible, which benefits a low flow resistance, and at the same time the filter cap 40 can be made extremely stable, so that it withstands strong pressure surges during operation of the high-pressure nozzle according to the invention.
  • metal powder is mixed with a thermoplastic plastic binder.
  • a metal powder for example, hard metal powder can be used.
  • the mixture thus obtained is also referred to as a feedstock.
  • a second step 72 the mixture thus obtained is then shaped by means of injection molding.
  • the precursor obtained after the injection molding is called a green component or green component.
  • a subsequent step 74 is referred to as debinding, and in the course of this step 74 the thermoplastic binder is removed from the precursor by suitable processes. These can be, for example, thermal or chemical processes. After debindering, there is a precursor having a comparatively porous structure in which there are interstices between the individual metal powder particles which were originally filled by the thermoplastic binder.
  • the precursor obtained after debindering is also referred to as Braunling or brown component.
  • the filter cap 40, the main body part 42 with the jet straightener 26 and the pipe part 44 are separately manufactured by metal powder injection molding and assembled after debindering.
  • the conduit member 44 may also be manufactured as a conventional rotary member and then assembled with the debindered precursors, namely the filter cap 40 and the filter body 42.
  • the assembled state of the precursors they are sintered in a step 78.
  • the sintering is carried out by a heat treatment process. After sintering, the material properties of the resulting end product are comparable to those of solid materials.
  • the assembled items, especially the filter cap 40, the filter body 42 and the lead portion 44, are inextricably linked by the step 78 of sintering and any existing joints between these items disappear. Outer wall and inner wall of the combined Strahlrichter- and filter component 16 thereby extend smoothly and without noticeable joints. This benefits a low flow resistance.
  • the components sintered together that is to say the combined jet straightener and filter component 16 can still be post-processed or surface-treated.
  • the accessible surfaces can be polished in order to reduce the flow resistance even further.
  • the combined Strahlrichter- and filter component 16 produced by metal powder injection molding can be designed aerodynamic and high-strength at the same time.
  • the use of metal powder injection molding thereby allows surprising improvements to conventional high-pressure nozzles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Nozzles (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Powder Metallurgy (AREA)
  • Filtering Materials (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Claims (3)

  1. Procédé de fabrication d'une buse haute pression pour le décalaminage de produits en acier, caractérisé par les étapes suivantes :
    - mélange de poudre métallique avec un liant en plastique,
    - moulage par injection du mélange obtenu dans un moule,
    - enlèvement du liant par des processus chimiques/thermiques et
    - frittage du produit préliminaire obtenu après l'enlèvement du liant,
    la buse haute pression présentant au moins un filtre (24) et un redresseur de jet (26), lesquels forment un composant de filtre et de redresseur de jet (16) qui est constitué d'au moins deux pièces individuelles qui sont assemblées l'une à l'autre de manière permanente par frittage conjoint.
  2. Procédé selon la revendication 1, caractérisé par l'assemblage conjoint de pièces individuelles se présentant sous forme de produits préliminaires après l'enlèvement du liant et le frittage des produits préliminaires assemblés conjointement.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la poudre métallique contient au moins en partie de la poudre de carbure.
EP11188268.4A 2007-05-15 2008-05-15 Procédé de fabrication d'une buse haute pression Active EP2422883B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11188268T PL2422883T3 (pl) 2007-05-15 2008-05-15 Sposób wytwarzania dyszy wysokociśnieniowej

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007024247A DE102007024247B3 (de) 2007-05-15 2007-05-15 Hochdruckdüse und Verfahren zum Herstellen einer Hochdruckdüse
EP08008919A EP1992415B1 (fr) 2007-05-15 2008-05-15 Buse haute pression et procédé de fabrication d'une buse haute pression

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP08008919A Division EP1992415B1 (fr) 2007-05-15 2008-05-15 Buse haute pression et procédé de fabrication d'une buse haute pression

Publications (3)

Publication Number Publication Date
EP2422883A2 EP2422883A2 (fr) 2012-02-29
EP2422883A3 EP2422883A3 (fr) 2013-04-24
EP2422883B1 true EP2422883B1 (fr) 2014-03-19

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EP08008919A Not-in-force EP1992415B1 (fr) 2007-05-15 2008-05-15 Buse haute pression et procédé de fabrication d'une buse haute pression
EP11188268.4A Active EP2422883B1 (fr) 2007-05-15 2008-05-15 Procédé de fabrication d'une buse haute pression

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EP08008919A Not-in-force EP1992415B1 (fr) 2007-05-15 2008-05-15 Buse haute pression et procédé de fabrication d'une buse haute pression

Country Status (10)

Country Link
US (2) US7841548B2 (fr)
EP (2) EP1992415B1 (fr)
JP (2) JP2008285755A (fr)
KR (1) KR101355984B1 (fr)
CN (1) CN101306409B (fr)
AT (1) ATE537910T1 (fr)
DE (1) DE102007024247B3 (fr)
ES (2) ES2378001T3 (fr)
PL (1) PL2422883T3 (fr)
RU (1) RU2483810C2 (fr)

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Also Published As

Publication number Publication date
CN101306409B (zh) 2012-11-28
JP2008285755A (ja) 2008-11-27
CN101306409A (zh) 2008-11-19
JP2013121589A (ja) 2013-06-20
US7841548B2 (en) 2010-11-30
US20080283635A1 (en) 2008-11-20
EP2422883A2 (fr) 2012-02-29
JP5658218B2 (ja) 2015-01-21
RU2008117855A (ru) 2009-11-20
RU2483810C2 (ru) 2013-06-10
DE102007024247B3 (de) 2008-11-06
ES2378001T3 (es) 2012-04-04
KR20080101710A (ko) 2008-11-21
EP1992415A3 (fr) 2010-01-27
EP1992415A2 (fr) 2008-11-19
PL2422883T3 (pl) 2014-08-29
US20110110811A1 (en) 2011-05-12
KR101355984B1 (ko) 2014-01-27
ES2463869T3 (es) 2014-05-29
EP2422883A3 (fr) 2013-04-24
EP1992415B1 (fr) 2011-12-21
ATE537910T1 (de) 2012-01-15

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