EP0401311B1 - Verfahren und giessform zum giessen von wellen - Google Patents

Verfahren und giessform zum giessen von wellen Download PDF

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Publication number
EP0401311B1
EP0401311B1 EP89907655A EP89907655A EP0401311B1 EP 0401311 B1 EP0401311 B1 EP 0401311B1 EP 89907655 A EP89907655 A EP 89907655A EP 89907655 A EP89907655 A EP 89907655A EP 0401311 B1 EP0401311 B1 EP 0401311B1
Authority
EP
European Patent Office
Prior art keywords
chill
pattern
projecting
parts
seal
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.)
Expired - Lifetime
Application number
EP89907655A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0401311A1 (de
Inventor
Alfred Tanner
Konrad Maier
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.)
Von Roll AG
Original Assignee
Von Roll AG
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 Von Roll AG filed Critical Von Roll AG
Priority to AT89907655T priority Critical patent/ATE83412T1/de
Publication of EP0401311A1 publication Critical patent/EP0401311A1/de
Application granted granted Critical
Publication of EP0401311B1 publication Critical patent/EP0401311B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor

Definitions

  • the invention relates to a method for casting shafts, in particular slim shafts, which also have projecting parts, in particular eccentric, bearing and cam parts, which are cast to achieve certain material properties by means of at least one mold placed in the mold, and a mold for Execution of the procedure.
  • camshafts are made of steel, while cast camshafts are preferred for vehicle engines.
  • the invention relates to the field of cast shafts that are manufactured in large numbers.
  • Cast camshafts should be inexpensive and still have a high quality in terms of wear resistance and damping.
  • the processing effort should be as small as possible, which means that material additions must be sought that do not go beyond what is required as grinding allowance.
  • the GP-A-2 175 521 from which the preambles of claims 1 and 5 start, column 1, line 5-21, is known to produce sand molds for casting such camshafts, whereby certain material properties are required to achieve them the storage areas and on the cams chill molds or scales be inserted.
  • the mold is usually in two parts and the mold is separated along the longitudinal axis of the camshaft. Accordingly, the model is also formed in two parts and the mold halves are molded with the model halves together with the molds.
  • this object is achieved in that means are provided on the mold or on the projecting parts of the model interacting with the mold, with which the penetration of sand into the mold cavity and the casting of the mold occur during the production of the mold errors on the circumferential surface of the projecting parts as well as larger material additions on the projecting parts are avoided.
  • sealing means are arranged on the circumferential surfaces of the projecting parts of the model of the shaft corresponding to the projecting parts of the shaft, with which sealing means the gap between the model and the mold is closed. This ensures that no molding sand gets into the space between the mold and the model and can then lead to surface defects or defects in the cast camshaft.
  • the part of the mold which forms the peripheral surface of the projecting parts is expediently provided with a waffle-shaped corrugation. It is thereby achieved that the surface of the above section is improved, which is essential by preventing the formation of ice flowers, cold welding spots and other surface defects.
  • the model division for the mold can be placed at the height of the vertical tangent point of the above section. It is thereby achieved that otherwise material additions occur in the shape division in the plane of the longitudinal axis of the shaft, for the removal of which additional machining work has to be used.
  • Fig. 1 shows a part of the model 1 of a shaft with protruding parts 2, 3, 4.
  • the protruding parts 2, 3, 4 are cams, which are used on the finished camshaft to control intake and exhaust valves of an internal combustion engine.
  • the one on the wave model The above-mentioned sections 5, 6 are, for example, bearing sections which have a larger diameter than the basic diameter 7 of the shaft model 1 and which are shaped in the casting mold by molding sand.
  • the above sections 5, 6 are sections with a circular diameter, but which is larger than the basic diameter 7 of the shaft of the model 1 or the camshaft.
  • molds 8, 9, 10 made of metal are placed, which form parts of the mold during the production of the casting mold.
  • the molds 8, 9, 10 can be individual molds, as shown in FIG. 1, but they can also be formed as part of a mold package 12, see FIG. 2, in which the molds 8, 9, 10 are formed by a Web 14 are connected to each other.
  • the first object is the need to prevent the formation of surface defects or defects on the projecting parts of the camshaft designed as cam disks; because when the cast camshaft is finished, an error-free surface should be obtained after removing the material addition.
  • sealing means 16 are provided on the projecting parts, with which the gap created by the play 15 between the outer contour of the projecting parts 2, 3, 4 and the inner contour of the molds 8, 9, 10 is closed.
  • the sealing means 16 can be designed differently. They are arranged on the above sections in such a way that at most one small, uncovered model section 17 remains. This uncovered model section should be at most about 2 mm.
  • the sealing means are two O-rings 18 made of a relatively soft elastomer.
  • the sealant is a flat seal 19, which is also made of a relatively soft elastomer.
  • the sealant is a lip seal 20. As with the O-ring seal 18, two such lip seals 20 are used to close the gap 15 at both ends.
  • the sealing means 16 are also removed when the model is removed.
  • FIG. 2 shows that the molds 8, 9, 10 are part of a mold package, which, however, need not be limited to three molds, but can also include further molds.
  • the advantage of using a mold package is that handling when molding the mold is made easier.
  • FIG. 3 A further measure is schematically shown in FIG. 3, with which material additions can be avoided.
  • the model that is used for the production of the mold which is usually in two parts, is also produced as a two-part model, one half of which is attached to a model plate.
  • the plane is usually through Longitudinal axis 22 of the camshaft selected.
  • two mold halves 23, 24 are shown for the two mold halves, which are used as a mold for the manufacture of one of the above-mentioned lots 2, 3, 4. Since these protruding parts are generally cams, which have an eccentric part which is not in the parting plane 21, the upper mold half 23 must have an inner contour 25 at this point, which enables the mold half to be placed on the model.
  • the lower mold half 24 is therefore given an inner contour 26.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mechanical Sealing (AREA)
EP89907655A 1988-12-06 1989-07-19 Verfahren und giessform zum giessen von wellen Expired - Lifetime EP0401311B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89907655T ATE83412T1 (de) 1988-12-06 1989-07-19 Verfahren und giessform zum giessen von wellen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4526/88A CH677626A5 (es) 1988-12-06 1988-12-06
CH4526/88 1988-12-06

Publications (2)

Publication Number Publication Date
EP0401311A1 EP0401311A1 (de) 1990-12-12
EP0401311B1 true EP0401311B1 (de) 1992-12-16

Family

ID=4277739

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89907655A Expired - Lifetime EP0401311B1 (de) 1988-12-06 1989-07-19 Verfahren und giessform zum giessen von wellen

Country Status (9)

Country Link
EP (1) EP0401311B1 (es)
JP (1) JPH03502553A (es)
KR (1) KR910700107A (es)
BR (1) BR8907221A (es)
CA (1) CA2003962A1 (es)
CH (1) CH677626A5 (es)
ES (1) ES2017878A6 (es)
GR (1) GR1000539B (es)
WO (1) WO1990006197A1 (es)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1727565A (en) * 1928-03-09 1929-09-10 Wilcox Rich Corp Chill plate for use in molding tappet heads
GB8403355D0 (en) * 1984-02-08 1984-03-14 Clancy Ltd G Castings
JPH0675745B2 (ja) * 1984-09-27 1994-09-28 日産自動車株式会社 部分チルド鋳鉄鋳物製造用鋳型
GB2175521A (en) * 1985-05-31 1986-12-03 Perkins Engines Group Manufacture of metal castings having chill-hardened zones

Also Published As

Publication number Publication date
WO1990006197A1 (de) 1990-06-14
GR1000539B (el) 1992-08-25
ES2017878A6 (es) 1991-03-01
JPH03502553A (ja) 1991-06-13
CH677626A5 (es) 1991-06-14
KR910700107A (ko) 1991-03-13
BR8907221A (pt) 1991-03-05
EP0401311A1 (de) 1990-12-12
CA2003962A1 (en) 1990-06-06
GR890100808A (en) 1991-03-15

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