Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
  • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
  • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
  • B24C1/083—Deburring
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
  • B24B31/10—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work
  • B24B31/116—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work using plastically deformable grinding compound, moved relatively to the workpiece under the influence of pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
  • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
  • B24C3/00—Abrasive blasting machines or devices; Plants
  • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
  • B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
  • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
  • F02M55/025—Common rails
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
  • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
  • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
  • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
  • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size

Definitions

• the invention relates to a method for the hydro-erosive rounding of an edge of a component, in particular an edge in a channel of a high-pressure-resistant component, in which a liquid mixed with grinding wheels is guided along the edge to be rounded and the flow velocity in the region of the edge to be rounded by body arranged in the flow path of the liquid is increased.
• the invention also relates to a device for the hydro-erosive rounding of an edge of a component, in particular an edge in a channel of a high-pressure-resistant component, with a body arranged in the flow path of a liquid mixed with grinding wheels and in the region of the edge to be rounded in order to increase the flow speed of the Liquid, wherein the body forms a flow channel with a wall preceding the edge in the flow direction of the liquid and adjacent to the edge, in particular for carrying out the aforementioned method.
• edges are also rounded here in the area of the intersected holes.
• a particular disadvantage here is the pore-like rough surface that occurs, which locally leads to voltage peaks. The pressure increase that can be achieved with this process is therefore lower than with the extrudehone process.
• autofrettage does not round off the edges, but rather creates an increased compressive strength by generating residual stresses which are opposite to the compressive stresses occurring during the operation of the component.
• the applied pressure is selected to be high enough that local plastic deformations occur and the plastic deformations do not occur over the entire component wall thickness, but only partially tially (about 50%) occur.
• the outer area of the wall is only elastic and the inner area is plastically deformed.
• This residual stress is opposed to the compressive stress in the sense of a counter-stress.
• this process is not suitable as a series process, since pressures of several thousand bar are required.
• German patent application DE 199 53 131 AI discloses a method and a device for rounding edges in mechanically, thermally or otherwise highly stressed components.
• the rounding of edges at intersections of channels in high-pressure accumulators of fuel injection systems is mentioned as a particular area of application.
• stress peaks occur in the area of edges of all kinds, which can lead to component failure, in particular to the component breaking.
• its edges are rounded.
• the rounding takes place by flowing around the edge to be rounded with an erosive liquid which is conveyed through the component by a feed pump.
• the area of the edge to increase the erosive effect of the liquid, its flow rate is increased by means of a cross-sectional taper.
• Flow velocity of the liquid and thus also the material removal in the area of the edge can be influenced.
• the delivery pressures are in the range of 50 bar to 140 bar.
• the direction of flow of the liquid and the longitudinal axis of the edge to be rounded are preferably one Include an angle of 90 °.
• a conical body is described in the region of the nozzle needle seat of the blind-hole-like one
• annular gap serves to achieve the desired increase in the flow velocity in the area of the edge to be rounded.
• the associated figure in this patent application shows that the annular gap widens when viewed in the direction of flow.
• the flow body thus consists of a shaft, the outer diameter of which is slightly smaller to form an annular channel for the erosive liquid than the inner diameter of the cylindrical guide bore in the injection nozzle for the nozzle needle.
• a cylindrical shaped tip that merges into a conical seat cone at its front end.
• the outer contour of the seat cone is matched to the inner contour of the seat cone of the injection nozzle.
• the outer diameter of the tip and the seat cone are selected such that the seat cone lies below and adjacent to the spray hole on the seat cone of the injection hole.
• the channel for the erosive liquid formed by the flow body thus ends in the region of the spray hole.
• the flow velocity of the erosive liquid entering the space of the seat cone from the ring channel between the inner wall of the guide bore and the outer wall of the shaft of the flow body initially decreases because the ring channel widens greatly in the area of the beginning of the tip. Then, in the area of the seat cone in the direction of the spray hole, the flow rate of the erosive liquid is increased again, since the conical inner wall of the seat cone runs towards the cylindrical outer wall of the tip when viewed in the direction of the tip of the flow body.
• guide grooves running in the longitudinal direction thereof can be incorporated in the outer wall of the tip, through which the abrasive abrasive bodies of the erosive liquid are aimed specifically at the upper region of the inlet edge of the spray hole. can be directed. This is intended to achieve an increased rounding in this area, which should then lead to a higher fuel flow rate.
• the present invention is based on the object of a method and a device for hydro-erosive rounding to create an edge of a component, in particular an edge in a channel of a high-pressure-resistant component, with which an optimization of the rounding result, preferably a concentration of the rounding on the edge region, is achieved.
• a body arranged in the flow path of the liquid is increased in that the flow speed of the liquid along the course of the body is increasingly increased until the edge to be rounded is reached via the geometry of the body such that the highest flow speed is reached precisely in the region of the edge which is accompanied by the highest abrasive effect of the erosive liquid.
• the entire rounding process can be done at a lower level overall Operating pressure of the feed pump for the erosive liquid can be operated.
• the flow rate of the liquid is steadily increasing over the geometry of the body, thereby also protecting the body and an adjacent wall of the component from an abrasive attack by the erosive liquid, since the erosive liquid is essentially parallel to the peripheral surface of the Body or flows to the wall.
• the liquid is deflected by the body in the direction of flow in the direction of the edge to be rounded.
• the grinding media contained in the liquid will flow against the edge with a vertical speed component. Due to the impulse, material is removed in the area of the edge. The body also influences the velocity vectors of the flow.
• an optimization of the rounding result is achieved in that the cross-sectional area of the flow channel, viewed in the flow direction of the liquid, decreases continuously along the course of the body, at least up to the edge.
• the steady decrease in the cross-sectional area of the flow channel protects the body and the adjacent wall of the component from excessive wear.
• a further optimization of the rounding of the edge is achieved in that the region of the peripheral surface of the body which is opposite the edge is designed in such a way that the flow of the liquid is at least partially deflected towards the edge.
• the body in the case of an edge to be rounded in the component, which has been formed by intersecting the end of a first bore with a cylindrical cross section with a second bore, the body is inserted centrally into the first bore between the peripheral surface of the body and an annular flow channel is formed in the wall of the first bore.
• the body has a widening in the direction of flow of the liquid, preferably as a conical section trained guide section, to which, seen in the direction of flow of the liquid, is followed by a deflection section which widens in an arc shape in the direction of the edge.
• the erosive liquid thus hits the edge at an angle which favors the abrasive effect.
• the depth of insertion of the body into the first bore is advantageously selected such that the deflection section of the body, when viewed in the direction of flow of the liquid, is at the same level as the edge.
• the body is as
• Hollow body formed with a channel through which the liquid is discharged from the component (1) after flowing past the edge to be rounded. It is also possible to vary the relative position of the flow body to the edge to be rounded, even during the grinding process.
• FIG. 1 shows a schematic sectional view of a section of a high-pressure-resistant component 1 of a fuel injection system, such as an injection nozzle, a forging nail, a welding rail, the displacement unit of a Com on-Rail high-pressure pump or the high-pressure area of a Common-Rail high-pressure pump.
• the component 1 has a feed channel and a main channel, which are designed in the form of a first bore 2 and a second bore 3.
• the first bore 2 opens into the bore 3 in the region of the wall 4 of the second bore 3.
• Intersect holes 2 and 3 is one in component 1 peripheral edge 5 is formed, which is sharp-edged after production of the holes 2 and 3.
• the longitudinal extensions of the two bores 2 and 3 run at right angles to one another in the preferred embodiment.
• a liquid 6, preferably a highly viscous lubricating oil, with grinding media is introduced into the first bore 2 by means of a feed pump (not shown) and flows along the edge 5.
• a body 7 is introduced into the first hole 2 in the area of the edge 5, the outer circumferential surface 8 of which is dimensioned such that between the wall 9 of the first hole 2 and the peripheral surface 8 Annular gap 10 is formed. If the delivery pressure of the delivery pump is maintained, the cross-sectional area of the first bore 2 is reduced and the flow velocity in the area of the annular gap 10 and thus also in the area of the edge 5 is increased.
• the increase in the flow rate is accompanied by an increase in the erosive effect of the liquid mixed with the grinding wheels.
• the body 7 has the task of reducing the flow cross-section in the region of the edge 5, only locally increasing the flow speeds for the rounding.
• the erosive rounding can also be carried out at adequate pressures in the range from approximately 10 bar to 500 bar.
• the liquid can leave the component 1 after the grinding process in two ways, both in the single figure are indicated.
• the body 7 - as shown - is designed as a hollow body with a central channel 15, the ends of the second bore 3 are closed and the liquid flows past the edge 5 and after a corresponding deflection through the second bore 3 leave channel 15, the end of which is connected to a return line, not shown.
• An alternative second flow path for the liquid results if the body 7 is designed as a solid body. The liquid then leaves the component 1 after the grinding process via the second bore 3, which is not closed in this case.
• the body 7 is essentially designed as a rotationally symmetrical cone with a conical guide section 11.
• the flow channel 10 formed after the body 7 has been introduced into the first bore 2 — viewed in the direction of flow of the liquid 6 — has a continuously decreasing cross-sectional area with the associated increase in flow velocity.
• the body 7 is arranged centrally in the first bore 2 and the flow channel 10 thus has a circumferential constant width, as seen in the flow direction S, at the same height.
• the longitudinal axis of the body 7 and the longitudinal axis of the first bore 2 thus coincide.
• the body 6 In addition to the increase in the flow velocity, which is favorable for the rounding, the body 6 also has this Function to direct the flow of the liquid in the direction of the edge 5. This leads to a further increase in the erosive effect of the liquid 7, since this is essentially caused by the impulse of the grinding body 12 flowing against the edge 5 with a vertical speed component.
• the body 6 in addition to the guide section 11 described above, the body 6 then has at its end with the larger diameter a deflection section 13 for guiding the liquid 7 in the direction of the edge 5, which is followed by a cylindrical flange section 14.
• the guide section 11 merges tangentially into the deflection section 13, which, viewed in cross section, is directed outward in an arc shape.
• the cylindrical deflection section 13 merges into the flange section 14 via a circumferential edge. Also in the region of the deflection section 13 and the flange section 14, the body 7 in the embodiment shown is rotationally symmetrical to its longitudinal axis. The depth of insertion of the body 7 into the first bore 2 is selected such that the edge 5 in
• Direction of flow S is approximately at the same level as the center of the deflection section 13.
• the relative position of the flow body 7 relative to the edge 5 to be rounded is preferably also varied in a targeted manner during the grinding process.
• the body 7 in the region of its flange section 14 has the largest diameter D, which, contrary to the direction of flow S to the end of the guide section 11 facing away from the flange section 14, except for the diameter d takes.
• the largest diameter D of the body 7 is smaller than the clear width W of the first bore 2.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• General Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Nozzles (AREA)

Applications Claiming Priority (3)

Publications (1)

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ID=30009808

Family Applications (1)

Country Status (4)

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Family Cites Families (3)

• 2002
  • 2002-07-04 DE DE2002130170 patent/DE10230170B3/de not_active Expired - Fee Related
• 2003
  • 2003-06-17 EP EP03740095A patent/EP1519810A1/de not_active Withdrawn
  • 2003-06-17 WO PCT/DE2003/002023 patent/WO2004004974A1/de not_active Application Discontinuation
  • 2003-06-17 JP JP2004518400A patent/JP2005536362A/ja active Pending

Non-Patent Citations (1)

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