EP0917624B1 - Method for producing a perforated disc for an injector valve - Google Patents

Description

State of the art

The invention is based on a method of manufacture a perforated disc for an injection valve of the type of claim 1 or claim 2 or claim 3.

From US Pat. No. 4,854,024 there is already a process for Manufacture of a multi-flow perforated plate for a Fuel injector known to have a thin metal raw material is used. In the Starting material is punched through holes, which are further processed by pressing or embossing can. Then circular perforated plates around the Holes punched out of the starting material, with what the perforated plates are available individually. It is also from the US-PS 4,854,024 and US-PS 4,923,169 known, a maximum of two of the perforated plates produced in this way are sandwiched to use a fuel injector. The two independent sheet metal layers of one For this purpose, perforated plates are superimposed between one Valve seat body and an inevitably to be attached Support ring clamped. Every single sheet layer of one two-layer perforated board is therefore manufactured completely separately, so that a multi-layer perforated plate only in the immediate installed condition on the injection valve. The Support ring must ultimately again by crimping or other joining methods are attached in the valve seat carrier, since it alone does not fix the perforated plate is present.

Several are also known from US Pat. No. 5,570,841 Lay comprehensive perforated disks, which in Find fuel injectors. The two or four layers of perforated disks are made of stainless steel or Silicon also made separately and have openings and channels as opening geometries created by eroding, galvanic deposition, etching, fine stamping or by Micromachining. The from the valve seat on The most distant intended location always has one Opening geometry with which a flowing medium Swirl component is applied. The one from the other independently produced layers only form immediately on Injector the multi-layer sandwich-type perforated disc, since the individual layers are stacked on top of each other between the Valve seat body and a support plate are clamped.

Likewise, US Pat. No. 5,484,108 Perforated disk elements known for fuel injection valves, the two or three thin layers of a suitable metal, e.g. a stainless steel. The locations of the Perforated disk elements are again separate here made from each other, being shaped such that they are sandwiched on top of each other in the area of their Opening geometries at least one cavity-forming chamber let arise. In the same way as in the above mentioned writings are the individual layers of the Perforated disk element between the valve seat body and a Support body clamped.

From US-PS 5,350,119 is already a Fuel injector known to be a clad Has perforated disc element. It is made Perforated disk element made of a metal strip resistant metal like molybdenum and one on it overlying coating of a soft metal such as copper. By The flat layers are crimped over the valve seat support of the perforated disc element held on the valve seat body.

An injector is already known from the unpublished JP 10-018943 A, the downstream of his valve seat with two successive spray orifice plates has several spray orifices. The two made separately Spray-poppet disks are immediately close to each other when they are installed fastened together by means of a weld seam on a valve seat body. The Spray orifices are so slightly offset from each other in the two independent spray perforated disks introduced that in the contact area of both Injection-perforated disks are formed to improve atomization.

Advantages of the invention

The inventive methods for producing a Perforated disc with the characterizing features of the claims 1 or 2 or 3 have the advantage that through their application in a simple way very effective multilayer Metal perforated disks in very large numbers are inexpensive to manufacture (line production). In a simple and cost-effective location assignment of individual sheet metal foils or Sheet metal layers of the later perforated disks through auxiliary openings realized so that a very high level of manufacturing reliability is present. The location assignment of the Sheet metal foils automatically via optical scanning and Image evaluation done. On for the production of multilayer Perforated machines and machines can be provided very simple the material, the sheet thickness, the desired Opening geometries and other parameters for each Ideally adapted to the application.

It is particularly advantageous to use the sheet metal foils in the form of Foil strips or rugs for the further To provide processing.

By the measures listed in the subclaims advantageous developments and improvements in the Claims 1 or 2 or 3 specified method possible.

The sheet metal foils are advantageously in rolled up form provided as an optimal Use of space on a production line is possible.

It at the edges of the film is particularly advantageous Sheet metal films at regular intervals auxiliary openings to provide, can engage in the centering devices, to bring the individual together precisely To ensure sheet metal foils. It's also very advantageous if crescent-shaped in the sheet metal foils Auxiliary openings are made with their inner Limits the diameter of the sheet metal blanks to be removed, which are the perforated disk blanks represent, set. These auxiliary openings run on hers Ends pointed and are next to each other Auxiliary opening only separated by a very narrow bridge. at a subsequent punching, deep drawing or cup these webs tear, causing the blanks or perforated disks to come off the perforated disc belt can be separated.

As an optional joining method for joining several sheet metal foils inside or outside the blanks ideally serve welding, soldering or gluing in all their different forms of application.

The separation of the Circular blanks and the bending of the circular blanks into cup-shaped ones Perforated disks in a deep-drawing tool in one and the same Processing step.

drawing

Embodiments of the invention are in the drawing shown in simplified form and in the following Description explained in more detail. 1 shows it partially illustrated injection valve with a first perforated disc according to the invention, Figure 2 a Principle of the process flow in the manufacture of a Perforated disc with stations A to E and at Fastening a perforated disc in an injection valve with the stations F and G, Figure 3 embodiments of Film strips for the production of a three-layer Perforated disc, Figure 4 is a perforated disc band with several superimposed film strips, Figures 5 and 6 Thermoforming tool with one to be machined Perforated disc belt, Figure 6a, a second embodiment of a Deep drawing tool, Figure 7 shows a first example of a deep-drawn, attached to a valve seat body Perforated disc, Figure 8 shows a second example of a deep-drawn, attached to a valve seat body Perforated disc, Figure 9 shows a third example of a deep-drawn, attached to a valve seat body Perforated disk, Figure 10 shows another perforated disk in a Top view, Figures 10a to 10c, the individual sheet layers of the Perforated disk according to Figure 10, Figure 11 is a perforated disk in Section along the line XI-XI, Figure 12, a fourth Example of a deep-drawn, on a valve seat body attached (two-layer) perforated disc, Figure 13 a first central area of a perforated disc, FIG. 14 a second central area of a perforated disc and FIG. 15 a third central area of a perforated disc for clarification different opening geometries.

Description of the embodiments

1 is an exemplary embodiment of the Use of a perforated disc produced according to the invention a valve in the form of an injector for Fuel injection systems from mixture compressors spark-ignited internal combustion engines partially shown. The injection valve has a tubular valve seat support 1, in which a valve axis 2 concentric Longitudinal opening 3 is formed. In the longitudinal opening 3 is a z. B. tubular valve needle 5 arranged on the its downstream end 6 with a z. B. spherical Valve closing body 7, for example five on its circumference Flattenings 8 are provided for fuel to flow past are connected.

The injection valve is actuated in a known manner Way, for example electromagnetic. For axial Movement of the valve needle 5 and thus to open against the Spring force of a return spring (not shown) or Closing the injection valve serves an indicated electromagnetic circuit with a magnetic coil 10, one Anchor 11 and a core 12. The anchor 11 is with the End of valve needle 5 facing away from valve closing body 7 through z. B. one produced by means of a laser Connected weld and aligned to the core 12.

To guide the valve closing body 7 during the A guide opening 15 serves for axial movement Valve seat body 16. In the downstream, the core 12 opposite end of the valve seat support 1 is in the concentric to the longitudinal axis 2 of the valve Longitudinal opening 3 of the z. B. cylindrical valve seat body 16 tightly assembled by welding. At its the Valve closing body 7 facing away from the lower end face 17 the valve seat body 16 with an inventive or produced according to the invention, e.g. pot-shaped Perforated disc 21 concentrically and firmly connected, that is directly on the valve seat body 16 with a bottom part 22 is present. The perforated disc 21 is at least two, in Embodiment of Figure 1 three a small thickness having, formed metal sheet layers 135, so that a so-called laminated perforated disc is present.

The connection of valve seat body 16 and perforated disk 21 takes place, for example, by a circular and dense first weld formed by means of a laser 25. Due to this type of assembly there is a risk of undesirable deformation of the perforated disc 21 in her middle area with that provided there Opening geometry 27 avoided. To the bottom part 22 of the Pot-shaped perforated disk 21 encloses itself on the outside circumferential retaining edge 28, which is in the axial direction extends away from the valve seat body 16 and up to its end is slightly tapered outwards. The Retaining edge 28 exerts a radial spring action on the wall the longitudinal opening 3. This will when inserting the Valve seat body 16 in the longitudinal opening 3 of the Valve seat carrier 1 chip formation at the longitudinal opening 3rd avoided. The holding edge 28 of the perforated disc 21 is on his free end with the wall of the longitudinal opening 3 for example by a circumferential and dense second Weld 30 connected. The tight welds prevent fuel from flowing through undesired Place in the longitudinal opening 3 directly in a Intake pipe of the internal combustion engine.

The insertion depth of the valve seat body 16 and pot-shaped perforated disk 21 existing valve seat part in the longitudinal opening 3 determines the size of the stroke Valve needle 5, since the one end position of the valve needle 5 at non-excited solenoid 10 by the system of Valve closing body 7 on a valve seat surface 29 of the Valve seat body 16 is fixed. The other end position the valve needle 5 is when the solenoid 10 is excited for example by the anchor 11 resting against the core 12 established. The path between these two end positions Valve needle 5 thus represents the stroke.

The spherical valve closing body 7 acts with the in Direction of flow tapering in the shape of a truncated cone Valve seat surface 29 of the valve seat body 16 together, the in the axial direction between the guide opening 15 and the lower end face 17 of the valve seat body 16 is formed is.

Figure 2 shows a schematic diagram of the process flow in the Production of a perforated disc 21 according to the invention, wherein the individual manufacturing and processing stations only are represented symbolically. Based on the following Figures 3 to 6 are still individual processing steps explained in more detail. In the first, labeled A. Station are located according to the desired number of Sheet layers 135 of the later perforated disc 21 sheet foils as for example, rolled up film strips 35. at Use of three film strips 35a, 35b and 35c for Production of a three sheet layers comprising 135 Sheet metal laminated perforated disc 21 is for the later Processing, especially when joining, expedient, the middle To coat film strips 35b. In the film strips 35 are subsequently in large numbers per slide 35 same opening geometries 27 of the perforated disc 21 and Auxiliary openings for centering and adjusting the Film strips 35 or for later exposure of the Perforated disks 21 introduced from the film strips 35.

This processing of the individual film strips 35 takes place in station B. In station B there are tools 36 provided with which in the individual film strips 35 the desired opening geometries 27 and the auxiliary openings be molded. All essential contours are included through micro punching, laser cutting, eroding, etching or comparable processes. Examples of such Figure 35 illustrates film strip 35 processed in this way 3. The film strips 35 run through the processed Station C, which is a heater 37 in the film strips 35, for example, in preparation of a soldering process are heated inductively. Station C is only provided as an option, as others, one at any time Joining processes that do not require heating to connect the Film strips 35 can be applied.

In station D, the individual parts are joined Foil strips 35 one on top of the other, the foil strips 35 with the help of centering devices to each other exactly be positioned and for example by rotating Pressure rollers 38 pressed together and transported on become. Laser welding, Light beam welding, electron beam welding, Ultrasonic welding, pressure welding, induction soldering, Laser beam soldering, electron beam soldering, gluing or others known methods are used. After that will be the multiple layers of film strips 35 Perforated disc belt 39 in station E processed such that Perforated disks 21 in the for installation in the injection valve desired size and contour. In station E the perforated disks 21 are separated, for example by punching out the perforated disc band 39 with a Tool 40, in particular a punching tool. The levels punched-out perforated disks 21 can already be so in one Injector are used. On the other hand, it is also possible with a tool 40 ', in particular one Thermoforming tool, the perforated disks 21 from the Perforated disc band 39 by tearing or cutting to separate and thus separate, the Perforated disks 21 at the same time directly with a cup-shaped Be given shape. Is punching out and a cup-shaped shape of the perforated disks 21 is desired, so is a deep-drawing process or a after punching out Flanging required.

The method steps for producing the perforated disks 21 are so far that only below the perforated disks 21 are installed. The isolated and perforated disks 21 are formed in the desired manner in a next process step at the bottom End face 17 of the valve seat body 16 with the aid of a Joining device 45 fastened, advantageously to achieve a tight and tight connection Laser welding device is used (station F). through symbolically indicated laser radiation 46 is the circular weld seam 25 achieved. That now present valve seat part made of valve seat body 16 and Subsequently, perforated disk 21 is optionally still finely machined, the valve seat part in one Holding device 47 is clamped (station G). With various machining tools 48 with which methods how honing (drawing grinding) or hard turning can be carried out, especially the inner contours of the valve seat body 16 (e.g. guide opening 15, valve seat surface 29) reworked.

Concrete embodiments of film strips 35 for one Perforated disk 21 is shown in FIG. 3 Foil strip 35a which later becomes the valve closing body 7 facing upper sheet metal layer 135a and the film strip 35c the lower valve valve 7 facing away later Sheet layer 135c of the perforated disc 21, during the Film strip 35b the one lying between these two Forms sheet layer 135b in the perforated disk 21. Usually are for laminated perforated disks manufactured according to the invention 21 two to five film strips 35 one above the other arranged, each a thickness of 0.05 mm to 0.3 mm, in particular about 0.1 mm. Each film strip 35 is in station B with an opening geometry 27 provided, which extends over the length of the film strip 35 in repeated large numbers. In the illustrated in Figure 3 The upper film strip 35a has an exemplary embodiment Opening geometry 27 in the form of a cross-like Inlet opening 27a, the middle film strip 35b one Opening geometry 27 of a passage opening 27b in a circular shape with a larger diameter than the extent of the cruciform Inlet opening 27a and the lower film strip 35c one Opening geometry 27 in the form of four circular, in Cover area of the passage opening 27b lying Spray openings 27c. In station B next to these opening geometries 27 further auxiliary openings 49, 50 brought in.

Between each two introduced opening geometries 27 are at equal intervals along each two film edges 52 auxiliary openings 49 as Centering recesses molded in according to the shape the tools or aids that will later intervene there be angular, rounded, tapered or beveled can. Other auxiliary openings 50 become crescent-shaped respective opening geometries 27 surrounding in the Film strips 35 are provided as openings. The e.g. four crescent-shaped auxiliary openings 50 close with their inner Contour a circle with a diameter of later Perforated disc 21 a. The from the auxiliary openings 50 enclosed circular areas in the Film strips 35 are referred to as blanks 53. At her The ends of the auxiliary openings 50 taper to a point, with between the individual auxiliary openings 50 narrow webs 55 are formed which are in the range of the round diameter a width of have only 0.2 to 0.3 mm. When punching or deep drawing in station E the webs 55 tear, causing the perforated disks 21 are exposed. Can in a particularly effective manner also several film strips 35 to a larger one Foil carpet can be summarized on the disc 53 in two Dimensions are arranged.

Figure 4 shows schematically a perforated disc band 39 in the Station D, where the film strips are brought together 35 is shown staggered. Starting from the left first only the lower film strip 35c, on which the middle film strip 35b opens. The upper Film strip 35a completes the perforated disc band 39, the there are three layers in the two right round blanks 53. In the top view of the round blanks 53 shows that the Spray openings 27c offset from the inlet opening 27a are arranged so that a perforated disc 21st medium flowing through, e.g. Fuel, a so-called S-shock experienced within the perforated disc 21, the one Improves atomization. In the auxiliary openings 49 grips a centering device 57 (index pins, Index bolt), which ensures that the blanks 53 of the individual film strips 35 dimensionally accurate and secure be placed on top of one another before the film strips 35 be connected to each other. The auxiliary openings 49 can also as feed grooves for automatic transport of the Foil strip 35 or the perforated disc band 39 used become. The fixed connections of the film strips 35 through Welding, soldering or gluing can be done both in the field of Rounds 53 as well as outside of rounds 53 near the Foil edges 52 or in central areas 58 between two opposite auxiliary openings 49 each be made.

5 and 6, the deep-drawing tool 40 ' schematically shown that the perforated disc band 39th is going through. The perforated disc band 39 lies with the Edge areas between the auxiliary openings 50 and Foil edges 52 e.g. on a workpiece support 59, against which it is pressed by means of a hold-down device 60. The hold-down device 60 has at least partially one frusto-conical opening 61, which has a matrix function to form the holding edge 28 of the perforated disc 21 takes over. There is also an opening 62 in the workpiece support 59 provided that is cylindrical and in the one Stamp 63 perpendicular to the plane of the perforated disc band 39 is movable. On the stamp 63 opposite Side of the perforated disc band 39 is in the opening 61 of the Hold-down device 60 is provided with a stamp counterpart 64 the movement of the stamp 63 follows, but the contour of the bottom part 22 of the perforated disk 21. The through the Stamp 63 force applied to the round blank 53, the greater is as the counterforce of the stamp counterpart 64, leads to a tearing of the blank 53 from the perforated disc band 39 in Area of the webs 55 and for the deformation of the round blank 53 in one pot-shaped perforated disk 21., In this in station E current procedure is a translational tensile pressure forming such as deep drawing or Cupping.

A sheet metal edge 65 remains torn off from the round blank 53 Waste in the deep-drawing tool 40 ', which, however, is recycled and can be used in the production of new sheet metal foils. On a firm connection of the film strips 35 in station D can to be completely dispensed with if by deep drawing or cups in station E the holding edge 28 of the perforated disk 21 is generated almost perpendicular to the bottom part 22, whereby namely a sufficiently firm connection in the bending area is created. Is through the opening 61 in the hold-down 60 a flatter angle is given, a fixed angle should be used Connect in station D in any case. at desired flat perforated disks 21, e.g. by Punch out from the perforated disc band 39 fixed connections required.

FIG. 6a shows a second embodiment of a Deep-drawing tool 40 "shown, the opposite to the Thermoforming tool 40 'shown in FIGS. 5 and 6 equivalent parts by the same reference numerals Marked are. In the deep drawing tool 40 "in one round, first cut the round blank 53, which is subsequently deep-drawn. The stamp 63 is surrounded by a sleeve-shaped cutting tool 67, that defines the opening 62 with its inner wall. The cutting tool moves together with the punch 63 67 perpendicular to the plane of the perforated disc band 39, as it is the arrows indicate. Due to the precisely centered and defined movement of punch 63 and cutting tool 67 against the also axially movable stamp counterpart 64 in the opening 61 of a die 66, the blank 53 is very precise from the perforated disc band 39 by a cutting edge of the Cutting tool 67 cut out. At a paragraph 75 of the The cutting tool 67 comes into the opening 61 in the die 66 to a standstill, at the same time for a fixation of the Round 53 ensures. In the further course, only the Stamp 63 moved into the opening 61 so that the blank 53 due to the partially frustoconical design of the Opening 61 is brought into a pot shape.

Different embodiments of from station F coming from the valve seat body 16 and the perforated disk 21st formed valve seat parts illustrate Figures 7 to 9. By deep drawing or cuping the blanks 53 in the Station E will be the outer edge of the disc as a later holding edge 28 of the perforated disc 21 from the plane of the perforated disc band 39 bent out. As FIGS. 6 to 9 show the holding edge 28 after leaving the deep-drawing tool 40 ' e.g. run almost perpendicular to the plane of the bottom part 22. When processing the film strips 35 in station B are already made by introducing the auxiliary openings 50 the diameters of the blanks 53 set.

Are the blank diameters in the individual foil strips 35 chosen the same size, the deep drawing creates the Sheet layers 135 a holding edge 28, which at its free, the Bottom part 22 facing away from the end is stepped (Figure 7). The inner sheet layer 135c of the holding edge 28 that the lower film strip 35c ends in most distant from the downstream direction Bottom part 22, while all other sheet metal layers 135 from the inside shorter towards the outside due to the deep-drawing process end up. However, if the diameter of the blanks 53 in the upper film strip 35a set larger than that Diameter of the rounds 53 in the middle film strip 35b and which in turn is larger than the diameter of the round blanks 53 in lower film strip 35c, the holding edge 28 on the one hand a gradation of the Sheet layers 135 in the opposite direction to that Have example according to Figure 7 (Figure 8) or on the other hand have a free end at which all sheet layers 135 in end at one level (Figure 9). Especially for attaching the Weld 30 at the holding edge 28 is the same choice or different disc diameters interesting.

In addition to the examples shown in Figures 3 and 4 Opening geometries 27 in the film strips 35 or Perforated disks 21 are also countless others (e.g. round, elliptical, polygonal, T-shaped, crescent-shaped, cruciform, semicircular, tunnel portal-like, bone-shaped, e.g. asymmetrical) opening geometries 27 for sheet metal laminated perforated disks 21 conceivable. Figures 10 and 11 show a preferred embodiment of FIG Opening geometries 27 in the individual sheet layers 135 one Perforated disk 21, wherein the figure 10 is a plan view of the Perforated disk 21 is removable. Especially the figure 11, the a sectional view taken along a line XI-XI in Figure 10 again illustrates the structure of the perforated disk 21 with its three sheet layers 135.

The upper sheet layer 135a (FIG. 10a) has one Inlet opening 27a with the largest possible circumference, the a contour similar to a stylized bat (or of a double H). The inlet opening 27a has one Cross-section with a partially rounded rectangle two each opposite, rectangular Constrictions 68 and thus three in turn over the Constrictions 68 protruding inlet areas 69th is writable. The three inlet areas 69 are related to the contour comparable to a bat Body / torso and the two wings of the bat (or the Crossbar to the longitudinal bar of the double H). With e.g. in each case the same distance from the central axis of the perforated disk 21 and are arranged symmetrically around them, for example in the lower sheet layer 135c (FIG. 10c) four circular ones Spray openings 27c are provided.

The spray openings 27c are in a projection of all Sheet layers 135 partially or in one plane (FIG. 10) largely in the constrictions 68 of the upper sheet metal layer 135a. The spray orifices 27c are offset Inlet opening 27a, i.e. in the projection the Inlet opening 27a nowhere the spray openings 27c cover. However, the offset can be different Directions can be different sizes.

To fluid flow from the inlet port 27a to To ensure the spray openings 27c is in the middle sheet layer 135b (Figure 10b) has a passage opening 27b formed as a channel (cavity). One contour of one rounded rectangular opening 27b is of such a size that it can be projected Inlet opening 27a completely covered and especially in the Areas of the constrictions 68 via the inlet opening 27a protrudes, i.e. a greater distance from the central axis of the Perforated disc 21 has the constrictions 68.

10a, 10b and 10c, the sheet metal layers 135a, 135b and 135c, as shown in the film strips 35 separated out before deep drawing in the perforated disc assembly are presented again individually to the Opening geometry 27 of each individual sheet layer 135 exactly illustrate. Every single figure is ultimately one simplified sectional view through the perforated disc belt 39 horizontally along each sheet layer 135a, 135b and 135c. In order to better illustrate the opening geometries 27, on one hatching and the body edges of the other Sheet layers 135 waived.

FIGS. 12 to 15 show exemplary embodiments of two Sheet metal layers 135 having perforated disks 21 which on a Valve seat body 16 of an injection valve by means of a tight weld 25 are mounted. The valve seat body 16 has a valve seat surface 29 following downstream Outlet opening compared to the three sheet layers 135 perforated disks 21 already have the inlet opening 27a. With its lower outlet opening 27a the valve seat body 16 is shaped such that its lower Front 17 partially an upper cover of the Passage opening 27b forms and thus the entry surface of the Specifies fuel in the perforated disc 21. All in the Figures 12 to 15 illustrated embodiments the outlet opening 27a has a smaller diameter than the diameter of an imaginary circle on which the Spray openings 27c of the perforated disk 21 are located. With others Expressed in words, there is a complete offset from the the outlet opening defining the perforated disc 21 27a and the spray openings 27c. With a projection of the valve seat body 16 covers the perforated disk 21 the valve seat body 16 all spray openings 27c. Due to the radial offset of the spray openings 27c there is an S-shaped shape with respect to the outlet opening 27a Flow of the medium, e.g. of fuel. An S-shaped flow is then already achieved when the valve seat body 16 all spray openings 27c only partially covered in the perforated disk 21.

Through the so-called S-stroke inside the perforated disk 21 with several strong flow diversions the flow becomes a strong, atomizing turbulence. The This creates a velocity gradient across the flow particularly pronounced. It is an expression of that Change in speed across the current, the Speed in the middle of the flow is significantly greater is as close to the walls. The from the Differences in speed resulting increased Shear stresses in the fluid promote the breakdown into fine Droplets near the spray ports 27c. Since the current in the One-sided outlet due to the embossed radial component detached, it experiences because of a lack of contouring no flow calming. A particularly high one The fluid has velocity on the detached side. The atomizing shear turbulence is thus in the Exit not destroyed.

The transverse impulses due to the turbulence transverse to Current lead among other things that the A large droplet distribution density in the spray Has uniformity. This results in one reduced probability of droplet coagulation, from small droplets to larger ones Drops. The consequence of the advantageous reduction of average droplet diameter in the spray is a relative one homogeneous spray distribution. Through the S-blow is in the Fluid creates a fine-scale (high-frequency) turbulence, which the beam immediately after exiting the Perforated disk 21 disintegrate into fine droplets leaves.

Three examples of designs of the opening geometry 27 in the central areas of the perforated disc 21 are as Top views shown in Figures 13 to 15. With a The dash-dot line is the one in these figures Outlet opening 27a of the valve seat body 16 in the region of the lower end face 17 symbolically indicated the offset to clarify the spray openings 27c. all Embodiments of the perforated disks 21 have in common that they have at least one passage opening 27b in the upper one Sheet layer 135 and at least one spray opening 27c, here four spray orifices 27c in the lower sheet layer 135 have, the passage openings 27b each as large with regard to their width or width that all Spray openings 27c are completely flowed over. In order to is meant that none of the passage openings 27b delimiting walls covers the spray openings 27c.

In the perforated disk 21 partially shown in FIG the passage opening 27b in a double diamond shape executed, the two diamonds by a middle Area are connected so that only one Passage opening 27b is present. However, they are just as good two or more passage openings 27b are conceivable. Of the double diamond-shaped passage opening 27b starting from four e.g. possessing square cross sections Spray openings 27c through the lower sheet layer 135, the seen from the center of the perforated disc 21 e.g. to the most distant points of the passage opening 27b are. In each case two spray openings 27c form on account of the elongated rhombuses of the passage opening 27b Opening pair. Such an arrangement of the spray orifices 27c enables a two-beam or Flachstrahlabspritzung.

In the other embodiments, the passage opening 27b circular (FIG. 14) or rectangular (FIG. 15) executed, from the spray openings 27c circular cross sections (Figures 14 and 15). These perforated disks 21 are also particularly suitable for Arrangement of two spray orifices 27c in a larger one Distance to two further spray openings 27c for one Zweistrahlabspritzung.

Claims (13)

1. Method for producing a perforated disc (21) for an injection valve, with the method steps of

   a) provision of at least two thin sheet-metal foils (35) in the form of foil strips or foil carpets,

   b) introduction of a large number of identical orifice geometries (27) of the subsequent perforated discs (21) and auxiliary orifices (49, 50) for each sheet-metal foil (35),

   c) placing of the individual sheet-metal foils (35) one onto the other with the aid of centring devices (57),

   d) connection of the sheet-metal foils (35), using an assembly method, with the result that a perforated-disc band (39) with a multiplicity of circular blanks (53) is obtained,

   e) separation of the circular blanks (53) for forming the perforated disc (21) out of the perforated-disc bank (39).
2. Method for producing a perforated disc (21) for an injection valve, with the method steps of

   a) provision of at least two thin sheet-metal foils (35) in the form of foil strips or foil carpets,

   b) introduction of a large number of identical orifice geometries (27) of the subsequent perforated discs (21) and auxiliary orifices (49, 50) for each sheet-metal foil (35),

   c) placing of the individual sheet-metal foils (35) one onto the other with the aid of centring devices (57),

   d) connection of the sheet-metal foils (35), using an assembly method, with the result that a perforated-disc band (39) with a multiplicity of circular blanks (53) is obtained,

   e) deep-drawing or cupping of the circular blanks (53) in order to form bowl-shaped perforated discs (21) and, at the same time, separation of the perforated discs (21) out of the perforated-disc band (39).
3. Method for producing a perforated disc (21) for an injection valve, with the method steps of

   a) provision of at least two thin sheet-metal foils (35) in the form of foil strips or foil carpets,

   b) introduction of a large number of identical orifice geometries (27) of the subsequent perforated discs (21) and auxiliary orifices (49, 50) for each sheet-metal foil (35),

   c) placing of the individual sheet-metal foils (35) one onto the other with the aid of centring devices (57), in order to produce a perforated-disc band (39) with a multiplicity of circular blanks (53),

   d) deep-drawing or cupping of the circular blanks (53) in order to form bowl-shaped perforated discs (21) and, at the same time, separation of the perforated discs (21) out of the perforated-disc band (39).
4. Method according to one of Claims 1 to 3, characterized in that the thin sheet-metal foils (35) are provided, rolled up.
5. Method according to one of the preceding claims, characterized in that introduction of the orifice geometries (27) and of the auxiliary orifices (49, 50) is carried out by means of punching, laser cutting, erosion or etching.
6. Method according to Claim 5, characterized in that first auxiliary orifices (49) into which centring devices (57) can engage in order to centre and adjust the sheet-metal foils (35), are provided at regular intervals at the foil edges (52).
7. Method according to Claim 5 or 6, characterized in that second sickle-shaped auxiliary orifices (50), which with their inner boundaries define the diameter of the circular blanks (53), are introduced into the sheet-metal foils (35).
8. Method according to Claim 7, characterized in that the second auxiliary orifices (50) are arranged with pointed ends in such a way that narrow webs (55) of approximately 0.2 to 0.3 mm remain between them.
9. Method according to Claim 1 or 2, characterized in that the sheet-metal foils (35) run through a heating device (37) before being connected.
10. Method according to one of Claims 1 or 2, characterized in that the connection of the sheet-metal foils (35) is carried out by means of welding, soldering or adhesive bonding.
11. Method according to Claim 1, characterized in that the separation of the circular blanks (53) for forming the perforated discs (21) out of the perforated-disc band (39) is carried out by punching out (40) or cutting out.
12. Method according to one of Claims 2 or 3, characterized in that the deep-drawing or cupping of the circular blanks (53) is carried out with the aid of a deep-drawing die (40', 40"), a movable male mould (63), in cooperation with a female mould (61, 66), shaping the circular blanks (53) into perforated discs (21) with a bottom part (22) and with a holding edge (28) angled in relation to the latter.
13. Method according to Claim 12, characterized in that, during deep-drawing or cupping, the circular blanks (53) are separated from the perforated-disc band (39) in the narrow webs (55) between the auxiliary orifices (50) defining the circular-blank diameter are torn.

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