WO2009007357A1 - Procédé de fabrication de corps à laminer - Google Patents

Procédé de fabrication de corps à laminer Download PDF

Info

Publication number
WO2009007357A1
WO2009007357A1 PCT/EP2008/058819 EP2008058819W WO2009007357A1 WO 2009007357 A1 WO2009007357 A1 WO 2009007357A1 EP 2008058819 W EP2008058819 W EP 2008058819W WO 2009007357 A1 WO2009007357 A1 WO 2009007357A1
Authority
WO
WIPO (PCT)
Prior art keywords
drops
rolling elements
balls
roller
starting material
Prior art date
Application number
PCT/EP2008/058819
Other languages
German (de)
English (en)
Inventor
Gerhard Meier
Bernd Haeusser
Andreas Dutt
Friedrich Muehleder
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2009007357A1 publication Critical patent/WO2009007357A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/34—Rollers; Needles
    • 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
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/42—Pumps with cylinders or pistons

Definitions

  • Rolling elements are successfully in use in a wide variety of rolling bearing designs, such as deep groove ball bearings, tapered roller bearings and cylindrical roller bearings. Even with roller tappets of high-pressure fuel pumps cylindrical rolling elements are used successfully.
  • rolling elements are made, for example, of the material designated 100 CR6 or a similar material. If particularly high demands are placed on the wear resistance and the heat resistance of the roller bearings, it is known to manufacture the rolling elements from high-speed steel, for example the high-speed steel HS6-5-2.
  • These high speed steels have a higher wear resistance and heat resistance than conventional rolling bearing materials. However, they contain the alloying elements tungsten,
  • Chromium, vanadium and / or cobalt Chromium, vanadium and / or cobalt. These alloying elements form primary carbides during the cooling phase after fusion. Since these primary carbides mainly occur in the inner region of the cooling melt, the carbides are distributed unevenly and there is the so-called carbide.
  • the invention has for its object to provide rolling elements whose tensile strength and rolling resistance compared to conventional rolling elements are significantly improved.
  • these properties should fluctuate in mass-produced rolling elements only within very narrow bandwidths, so that despite an optimal utilization of the material, the failure rate, which is very low.
  • the design can be further optimized while at the same time reducing the susceptibility to errors.
  • This object is achieved by a method for producing rolling elements, in which a starting material, such as is commonly used for the production of rolling elements, is melted, this melted starting material is atomized, so that form balls and / or drops with a small diameter and then these balls and / or drops are pressed in a mold under pressure and temperature to a WälzSystemrohling.
  • a starting material such as is commonly used for the production of rolling elements
  • the balls / drops of the atomized melt are very homogeneous in their structure and composition. This avoids the formation of carbide in high-speed steels.
  • the inventive sintering of the balls and / or drops in a mold thus produces a powder metallurgically produced WälzSystemrohling whose structure is very homogeneous over the entire cross-section and in particular no "breaking points" as they represent larger carbide grains and the mentioned carbide. Therefore, the WälzSystemrohling produced by the novel process in terms of rolling strength and tensile strength is higher loadable than one by melting as one of a semi-finished product produced rolling element blank.
  • the bulk of the fused balls and / or drops have a diameter of less than one millimeter (1 mm). Particularly preferred are diameters smaller than 0.5 mm.
  • a particularly advantageous starting material for the Wälz redesignrohlinge invention is high speed steel, in particular, the high-speed steel HS6-5-2, has yielded very good results.
  • the rolling element blanks are mechanically processed after pressing, in particular by grinding and / or superfinishing.
  • FIG. 1 shows a flowchart of a method according to the invention for producing a
  • Rolling element blanks and 2 shows a high-pressure fuel pump, the roller tappet is equipped with a plunger according to the invention.
  • FIG. 1 shows a flow chart of an exemplary embodiment of a method according to the invention.
  • the starting material is melted.
  • this liquid starting material is atomized so that balls and / or drops of a defined size distribution are formed.
  • sizes of the drops and / or spheres smaller than 1 mm have proven to be particularly preferred.
  • the pressing of the rolling element blanks in the functional block 107 is carried out at high temperature and high pressures. To avoid pores and to increase the strength, the blanks can be forged afterwards.
  • a fifth functional block 109 the rolling element blanks are finished in a conventional manner, for example by grinding and / or superflexing.
  • FIG. 2 shows schematically a radial piston pump for high-pressure fuel supply in fuel injection systems, in particular common-rail fuel injection systems, of internal combustion engines in section.
  • the radial piston pump shown in Figure 1 is equipped with an integrated demand quantity control. The flow rate control takes place on the suction side via a metering unit ZME.
  • the radial piston pump shown by way of example in FIG. 2 comprises a drive shaft 2 mounted in a pump housing 1 with two cams 36 offset by 180 °. Two pistons 8 are supported against the cams 36. The pistons 8 are each received in an element bore 11 in the radial direction movable back and forth. The pistons 8 are arranged at an angle of about 90 ° to each other and limit at its end remote from the drive shaft 2 a delivery chamber (not shown).
  • a plate 14 is provided on the piston 8. These plates 14 may be either integral with the piston 8 or removably attached thereto.
  • a spring 17 is biased. The springs 17 press the pistons 8 against the bottoms 20 of the plungers 23.
  • From the bottoms 20 of the plungers 23 extends a cylindrical guide body 26 in the direction of the delivery chambers, not shown. The guide body 26 are part of the plunger 23 and prevent tilting of the plunger 23 in a guide bore.
  • the plungers 23 are displaceable in the pump housing 1.
  • a semicircular recess 27 is provided which serves to support a roller 28.
  • the recess 27 and the roller 28 form a sliding bearing, while the roller 28 rolls on the cam 36 of the drive shaft 2.
  • the roller 28 is fixed in the guide bore 29. In this case, a relative movement between the end faces of the roller 28 and the guide bore 29 takes place, which can cause wear.
  • the roller 28 is produced by the method according to the invention by powder metallurgy.
  • the radial piston pump shown in Fig. 2 serves to pressurize fuel, which is supplied by a prefeed pump from a tank, with high pressure.
  • the pistons 8 are moved away from the axis of rotation of the drive shaft camshaft 2 as a result of the eccentric movement of the cams 36 of the drive shaft 2.
  • the pistons 8 move radially toward the axis of the camshaft 2 in order to suck fuel into the delivery chamber (not shown).
  • a lubricant supply 38 with a throttle 39 instead, directly with fuel from the fuel tank of the internal combustion engine, not shown on a Supply line 40 is fed. From the supply line 40 branches off a line 43 which supplies the metering unit ZME of the radial piston pump with fuel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention propose un procédé de fabrication par métallurgie des poudres de corps à laminer, qui permet de fabriquer des corps à laminer qui présentent une résistance en traction et une tenue au laminage encore meilleures tout en conservant une haute tenue à la chaleur.
PCT/EP2008/058819 2007-07-11 2008-07-08 Procédé de fabrication de corps à laminer WO2009007357A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007032216A DE102007032216A1 (de) 2007-07-11 2007-07-11 Verfahren zur Herstellung von Wälzkörpern
DE102007032216.1 2007-07-11

Publications (1)

Publication Number Publication Date
WO2009007357A1 true WO2009007357A1 (fr) 2009-01-15

Family

ID=39822180

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/058819 WO2009007357A1 (fr) 2007-07-11 2008-07-08 Procédé de fabrication de corps à laminer

Country Status (2)

Country Link
DE (1) DE102007032216A1 (fr)
WO (1) WO2009007357A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010019587B4 (de) * 2010-05-05 2022-02-03 Schaeffler Technologies AG & Co. KG Wälzlager
CN108491588B (zh) * 2018-03-02 2021-10-22 武汉理工大学 推力滚子轴承套圈冷空间包络成形方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5108491A (en) * 1990-06-04 1992-04-28 Nippon Seiko Kabushiki Kaisha Rolling bearing composition
WO2001030518A2 (fr) * 1999-10-27 2001-05-03 Mkl-Miniaturkugellager Gmbh Procede de fabrication d'ebauches spheriques destinees a etre utilisees dans des paliers a roulement
JP2005256906A (ja) * 2004-03-10 2005-09-22 Nsk Ltd 転がり軸受

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5108491A (en) * 1990-06-04 1992-04-28 Nippon Seiko Kabushiki Kaisha Rolling bearing composition
WO2001030518A2 (fr) * 1999-10-27 2001-05-03 Mkl-Miniaturkugellager Gmbh Procede de fabrication d'ebauches spheriques destinees a etre utilisees dans des paliers a roulement
JP2005256906A (ja) * 2004-03-10 2005-09-22 Nsk Ltd 転がり軸受

Also Published As

Publication number Publication date
DE102007032216A1 (de) 2009-01-15

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