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
  • 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
  • B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
• • 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
• • 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
  • Y10T29/47—Burnishing
  • Y10T29/479—Burnishing by shot peening or blasting

Definitions

• the invention relates to a method for producing a high-pressure fuel accumulator according to the independent claim.
• High-pressure fuel accumulators are used in particular in diesel engines with so-called common rail systems.
• the fuel is compressed to a pressure of more than 1000 to more than 2000 bar using a high-pressure pump and fed to the high-pressure fuel reservoir. From this pressure lines lead to the injectors of the individual combustion chambers of the internal combustion engine.
• the high-pressure fuel reservoir is subject to a considerable mechanical load at the prevailing pressures, which also fluctuates greatly during operation.
• the object of the invention is to provide a method for increasing the pressure resistance of a high-pressure fuel accumulator, which avoids the disadvantages in the prior art and which enables an optimized blasting effect of the inner cutting edges.
• This object is achieved with a method according to independent claim 1.
• a method according to the invention for producing a high-pressure fuel accumulator of an internal combustion engine with a storage injection system, in particular a diesel internal combustion engine with a common rail injection system, in which branchings for connecting pressure lines are introduced into the latter after the production of a hollow pressure accumulator from metal in which branchings for connecting pressure lines are introduced into the latter after the production of a hollow pressure accumulator from metal, the Inner bore and in particular the vulnerable branches on their inner edges leading to a cavity of the pressure accumulator are treated by means of a shot peening process. As a result, residual compressive stresses are introduced into the material. The formation of radii is the result of such a treatment.
• each inner edge of each branch is blasted one after the other in both directions of the course of the cavity of the pressure accumulator, the lance being directed against and / or in the jet direction.
• This method according to the invention has the advantage that the rounding of the inner edges of the branches in the high-pressure accumulator can be produced much more uniformly and with a constant radius.
• the radiation in both longitudinal directions of the cavity of the pressure accumulator leads to a constant treatment along the entire inner edge of each branch.
• the lance which runs longitudinally against the jet direction of the balls, serves to deflect the balls in the direction of the walls of the inner bore of the pressure accumulator. Irradiation in two directions accordingly leads to a constant rounding depending on the duration of the irradiation.
• the radiance of the sides ensures that the inside edges are treated evenly on all sides.
• rounded jet grain is used, i.e. a blasting material of defined ball size and defined ball hardness. Shot peening with such blasting material ensures precisely reproducible dimensions and properties of the high-pressure accumulator, even when processing large batches.
• the high-pressure accumulator can be made from a structural steel, a case-hardening steel, a tempering steel or also from a stainless steel.
• a preferred embodiment of the invention provides that the high-pressure accumulator is made of forged steel, which has a particularly high strength and toughness under the changing pressure loads that occur.
• the steels mentioned can all be strengthened by shot peening to such an extent that the inner surface is compacted and thus a notch effect is significantly reduced.
• a preferred embodiment of the invention provides that the lance is guided centrally in the pressure accumulator.
• the central guidance of the essentially cylindrical lance in the likewise cylindrical inner cavity of the pressure accumulator leads to a largely uniform solidification of the inner surface of the pressure accumulator due to the cone tip of the lance.
• the central guidance can preferably be ensured in that the lance has at least three support elements which are evenly distributed on the cylindrical circumference and which can slide along the longitudinal direction in the cavity of the pressure accumulator.
• FIG. 1 shows a partial side view of a high-pressure fuel accumulator
• FIG. 2 shows a detail section of a branching of the pressure accumulator according to FIG. 1 and
• Figure 3 shows a lance to influence the rounding in the inventive method for manufacturing the pressure accumulator.
• Figure 1 shows a pressure accumulator 2, which consists of an essentially cylindrical tube 4 made of steel. On the outer circumference of the tube 4, several pressure line connections 6 can be seen, to each of which pressure lines can be connected, which lead to injectors of the internal combustion engine.
• the tube 4 is preferably made of steel, which can be forged for strength reasons. Suitable materials for the pressure accumulator 2 are, for example, structural steel, case hardening steel, tempering steel or stainless steel, which is preferably forged.
• FIG. 2 shows a detailed section of a branch 8 of the pressure accumulator 2 according to FIG. 1.
• an inner bore 11 can be seen, which runs essentially cylindrically in the interior of the hollow pressure accumulator 2.
• a plurality of branches 8 are provided perpendicular to the longitudinal direction of extension of the inner bore 11 of the tube 4, only one of which can be seen in FIG. 2.
• the round branching can, for example, be designed as a bore which opens centrally into the inner bore 11 of the tube 4.
• an inner edge 9 of the branch 8 is provided with a radius 10 which is produced by shot peening. Shot peening also serves to solidify the inner surface of the tube 4, thereby significantly reducing its notching effect.
• an essentially cylindrical lance 12 which has a conical tip 14 at its end facing the beam direction 16, is guided in the shot peening along a longitudinal extension direction of the inner bore 11 in the opposite or in the same direction to the beam direction 16.
• the cone tip 14 of the lance 12 causes a deflection of the blasting material in the direction of the walls of the inner bore 11 and in the direction of the inner edge 9 of each branch 8, whereby the inner edges 9 each have a radius 10.
• the irradiation is carried out in both directions of the longitudinal direction of the tube 4, the lance 12 with its Cone tip 14 points in the opposite direction.
• the beam direction 16 would be from right to left in this case, the cone tip 14 would point to the right in this case.
• a lance is illustrated in FIG. 3, which is used to influence the rounding in the method according to the invention for producing the pressure accumulator.
• the left image in FIG. 3 shows a top view of the cone tip 14 of the lance 12.
• On the outer cylindrical circumference of the lance 12 a total of three support elements 18 can be seen, which are distributed in a star shape uniformly on the circumference of the lance 12 and which are dimensioned in terms of their length. that a largely play-free sliding movement of the lance 12 in the inner bore 11 of the tube 4 is made possible.
• the right image in FIG. 3 shows a side view of a lance 12, two of the three support elements 18 being recognizable.
• So-called shot peening which consists of metal balls of a certain hardness, is particularly suitable for shot peening. The balls each have a diameter between 0.2 and 0.6 mm, the different diameters in the blasting material following a statistical distribution.
• Rounded grit is also particularly suitable as blasting material, ie a blasting material with a defined size and defined hardness.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7697949

Family Applications (1)

Country Status (6)

Families Citing this family (7)

Family Cites Families (8)

• 2001
  • 2001-09-06 DE DE10143736A patent/DE10143736C1/de not_active Expired - Fee Related
• 2002
  • 2002-09-05 JP JP2003526639A patent/JP2005500916A/ja active Pending
  • 2002-09-05 EP EP02769909A patent/EP1423237A2/de not_active Withdrawn
  • 2002-09-05 WO PCT/DE2002/003291 patent/WO2003022526A2/de not_active Application Discontinuation
  • 2002-09-05 HU HU0401734A patent/HUP0401734A2/hu unknown
• 2004
  • 2004-03-05 US US10/794,208 patent/US6931900B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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