EP1908541A1 - Honverfahren unter Vorspannung - Google Patents

Honverfahren unter Vorspannung Download PDF

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Publication number
EP1908541A1
EP1908541A1 EP07116882A EP07116882A EP1908541A1 EP 1908541 A1 EP1908541 A1 EP 1908541A1 EP 07116882 A EP07116882 A EP 07116882A EP 07116882 A EP07116882 A EP 07116882A EP 1908541 A1 EP1908541 A1 EP 1908541A1
Authority
EP
European Patent Office
Prior art keywords
lapping
screws
cylinder
engine block
phase
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.)
Granted
Application number
EP07116882A
Other languages
English (en)
French (fr)
Other versions
EP1908541B1 (de
Inventor
Christian Noiret
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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 Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1908541A1 publication Critical patent/EP1908541A1/de
Application granted granted Critical
Publication of EP1908541B1 publication Critical patent/EP1908541B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/10—Accessories
    • 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
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies

Definitions

  • the technical field of the invention relates to the running-in processes of the cylinders of a motor vehicle engine block. More specifically, the invention relates to a method of lapping cylinders stressed, so as to simulate the clamping forces of the cylinder head on the engine block.
  • one of the ways to reduce fuel consumption is to reduce friction losses of the engine. Part of the losses occur in the friction of the segments that provide the sealing functions between the combustion chamber and the housing. To ensure this function properly it is necessary that said segments marry the best shape of the cylinder, thus requiring a certain plating force. If the cylinder is strongly deformed, there will need a strong plating force, resulting in a significant loss of friction.
  • One way to reduce these friction losses is to obtain a geometry of the cylinder as perfect as possible.
  • the break-in methods according to the invention make it possible to solve the aforementioned problems by creating a constraint in the engine block and having a continuous process, requiring no manual intervention. In this way, said methods remain qualitatively efficient, incorporating into the engine block to be honed a constraint representative of that caused by the tightening of the cylinder head on the engine block, and quantitatively, insofar as the various operations are carried out continuously , and therefore, over an optimized time.
  • the term “station” refers both to a specific part of the lapping machine, a specific phase of the lapping process.
  • special assigned to the screws, means that the screws do not perform their usual function, and are used only temporarily, only as part of the running-in process, to contribute to the stressing of the engine block.
  • the subject of the present invention is a method for lapping at least one cylinder of a motor vehicle engine block, using a lapping machine comprising a support table and at least one lapping guide, said method being unfolded. in three distinct and consecutive phases, consisting initially of a roughing step, followed by a semi-finishing step and completed by a finishing step.
  • the main technical feature of the method according to the invention is that said method is continuous and integrates, at each of said phases, a preliminary phase of stressing said motor unit. Indeed, in order to avoid the cylinder shape defects induced by the subsequent tightening of the cylinder head on the engine block, it is particularly desirable to lapping the cylinder under stress, to be representative of said clamping. Thus, when tightening the cylinder head on the engine block, the cylinder will maintain a perfect geometry.
  • the preliminary phase of stressing takes place at the beginning of each of the three main phases of the process and stops at the end of each of said phases.
  • the stress experienced by the block is effected along an axis parallel to the axis of revolution of the cylinder.
  • the yoke is fixed on the engine block in an interface plane perpendicular to the axis of revolution of the cylinder, and the clamping forces are therefore in a direction perpendicular to said interface plane.
  • said method includes an initial step (11) of implantation of temporary fixing elements (12) in the engine block (3).
  • each preliminary phase of stressing consists of an interaction phase between said temporary fastening elements (12) and mobile stressing members (15) integral with the support table (13).
  • the stressing of the engine block results from an interaction between a part of the lapping machine and an artificial part of said block.
  • the artificial term is to be compared to the temporary term.
  • the stressing of the motor unit requires the introduction of additional elements having no particular function at said block, outside said process.
  • the implantation of said elements will last only the time necessary for the running-in of the cylinder.
  • the movable members of the support table will first establish a mechanical contact with the fasteners, then exert a force on them to subject them to stress.
  • the initial phase of implantation of the temporary fastening elements in the engine block is automated, so as to make this implantation reproducible and to promote the progress of the process.
  • the temporary fastening elements are constituted by screws, implanted in the surface of the engine block intended to come into contact with the cylinder head, and the movable members, which are connected to an energy source, cooperate with said screws so as to to exert a traction force on them.
  • the longitudinal axis of said screws is perpendicular to the contact surface of the engine block with the cylinder head, thus defining the precise direction in which the stress will be exerted.
  • the energy source will help move the movable members of the support table, to exert a thrust on the screws.
  • the screws have an enlarged head, and the members abut against said head, so as to be able to exert a thrust on them, after the triggering of the energy source.
  • each member has an elongated piece ending in a forked end fitting around the screw, below its enlarged head.
  • the energy source is constituted by a hydraulic device with a jack under pressure, able to exert a thrust on the elongated piece, so as to push the forked end against the head.
  • the energy source may take other forms and be of electrical, mechanical, pneumatic or electromagnetic origin.
  • each lapping cylinder is framed by four screws, equitably distributed around it.
  • the screws are placed at the vertices of a regular quadrilateral such as, for example, a square or a rectangle. This symmetrical configuration makes it possible to better distribute the forces exerted on each cylinder, in the image of the forces generated by the tightening of the cylinder head on the block.
  • the screws are made of high-strength steel
  • the tensile force is representative of the force of the real head bolts
  • the method comprises a final phase of removal of the temporary fasteners.
  • This final phase which is necessary, is automated and is included in the continuous process.
  • the invention also relates to an engine block comprising at least one cylinder having been ground in a method according to the invention.
  • the invention relates to a motor vehicle engine comprising an engine block having at least one cylinder having been ground in a method according to the invention.
  • the methods according to the invention have the advantage of being reliable and reproducible since all the steps are automated and do not require of human interventions. They also have the advantage of offering a high engine block running frequency, insofar as they have a continuous course.
  • a lapping machine1 used in a lapping method according to the invention comprises an upper active portion 4 for the lapping activity itself, and a lower portion 5 to support and conveying the treated engine blocks 3, in a horizontal direction.
  • the upper part 4 consists of a plurality of grinders 6, represented by agglomerated abrasive sticks of substantially cylindrical shape and whose longitudinal axis is vertical.
  • a lapping machine 1 consists of three successive main stations, the first 8 being devoted to the blank, the second 9 to the semi-finishing and the third 10 to the finishing of the cylinder 2. These different run-in phases are distinguished from each other by the speed of rotation of the rods 6 and their roughness.
  • FIG. 1 illustrates the first station of the lapping machine 1 intended for the roughing phase of the cylinder 2.
  • Each station 8, 9, 10 therefore comprises an active upper part 4 and a lower part 5. supporting and conveying the motor blocks 3.
  • the lapping machine 1 comprises an initial automated screwing station 11 consisting in implanting special screws 12 around each cylinder 2 of the engine block 3 to be treated, said screws 12 each having an enlarged head. 22.
  • Each engine block 3 has a contact surface perpendicular to the axis of revolution of each cylinder 2 to be honed and each of said cylinders 2 is flush, said surface being intended to be pressed against an equivalent surface of the engine cylinder head during the tightening of said yoke on said block 3.
  • Each of the special screws 12 is thus implanted in said contact surface, perpendicular to it, the longitudinal axis of said screws 12 thus being parallel to the axis of revolution of each 2.
  • each cylinder 2 is framed by four special screws 12 arranged at the vertices of a rectangle surrounding each of said cylinders. s 2.
  • the lower part 5 of each of the three main stations 8, 9, 10 of the lapping machine 1, respectively concerning the blank, the semi-finishing and the finish comprises a support table 13 horizontal and 14 guides rods in the form of hollow cylindrical parts, placed in line with the cylinders 2 to be treated. Said guides 14 are intended to optimize the position of each lapel 6 within each cylinder 2 to be honed.
  • the support table 13 comprises a plurality of movable stressing members 15, the number of which is the same as that of the special screws 12 implanted in the engine block 3.
  • Said members 15 are identical to each other and are each constituted by a horizontal base 16, able to move on the support table 13 and on which is fixed, irremovably, a rod 17 in a vertical position.
  • the free end 18 of the rod 17 is slightly flared and is connected to an elongated piece 19, of in a more precise manner, one end 20 of the elongate piece 19 is connected to the free end 18 of the rod 17 to allow said piece 19 to make a movement. rotation around said free end 18.
  • the other end 21 of the elongated piece 19 is forked and is intended to be placed under the head 22 of a special screw 12, and more particularly to its contact.
  • a hydraulic device 23 comprising a jack 24 under pressure is implanted in the base 16 of each movable member 15 so that the jack 24 abuts against the elongated member 19.
  • said elongate member 19 has a notch 25 for locking the end of the cylinder 24.
  • the hydraulic device 23 is positioned on the base 16 to allow the cylinder 24 to move along an axis parallel to the longitudinal axis of the rod 17.
  • a lapping machine 1 used in a lapping method according to the invention comprises a final station 26 for extracting the special screws 12 of the engine block 3, after the cylinders 2 thereof have been honed. This extraction is achieved by a simple unscrewing operation.
  • the honing method according to the invention is carried out by respecting the following steps.
  • An engine block 3 is routed to the initial screwing station 11 during which it receives four screws 12 per cylinder 2.
  • the screws 12 are located at predetermined locations around each cylinder 2, so as to emerge quite widely from said engine block 3
  • Block 3 reaches the first lapping station 8 for roughing.
  • the mobile moving members 15 are then moved automatically in translation on the support table 13 following a guide path, until the forked end 21 comes to be placed under the enlarged head 22 of each of the screws 12 which emerges from said support table 13. In this way, the forked end 12 comes to grip the screw 12.
  • the pneumatic devices 13 are then triggered, moving each of the cylinders 24, which will exert a thrust on the elongated piece 19, placed in abutment against the screw 12 via its end forked 21.
  • the screws 12 then undergo a tensile force along their longitudinal axis tending to remove them from their location in block 3.
  • Block 3 is then under stress.
  • the grinders 6 descend into the cylinders 2, being assisted by the guides 14. Once correctly positioned in the cylinders 2, the grinders 6 begin to turn to lap said cylinders 2.
  • the pneumatic devices 13 are deactivated and the members 15 are removed.
  • the engine block 3, still fitted with its screws 12, is conveyed to the next station 9 dedicated to the semi-finishing. Block 3 is put under stress on the same diagram as the previous one.
  • each station 8, 9, 10 can lapping simultaneously a variable number of cylinders 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Saccharide Compounds (AREA)
  • Steroid Compounds (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
EP07116882A 2006-10-04 2007-09-20 Honverfahren unter Vorspannung Not-in-force EP1908541B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0654073A FR2906747B1 (fr) 2006-10-04 2006-10-04 Procede de rodage sous contrainte.

Publications (2)

Publication Number Publication Date
EP1908541A1 true EP1908541A1 (de) 2008-04-09
EP1908541B1 EP1908541B1 (de) 2009-12-16

Family

ID=37885831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07116882A Not-in-force EP1908541B1 (de) 2006-10-04 2007-09-20 Honverfahren unter Vorspannung

Country Status (4)

Country Link
EP (1) EP1908541B1 (de)
AT (1) ATE451992T1 (de)
DE (1) DE602007003790D1 (de)
FR (1) FR2906747B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017174311A1 (de) * 2016-04-04 2017-10-12 Nagel Maschinen- Und Werkzeugfabrik Gmbh Honmaschine mit mehreren arbeitsstationen, fertigungsanlage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2006159A (en) * 1934-09-28 1935-06-25 Micromatic Hone Corp Method of machining cylinders
US4117633A (en) * 1977-09-12 1978-10-03 Yother Cecil L Honing plate
US4234275A (en) 1978-07-26 1980-11-18 Clement Michael H Method and apparatus for mounting an engine block boring machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2006159A (en) * 1934-09-28 1935-06-25 Micromatic Hone Corp Method of machining cylinders
US4117633A (en) * 1977-09-12 1978-10-03 Yother Cecil L Honing plate
US4234275A (en) 1978-07-26 1980-11-18 Clement Michael H Method and apparatus for mounting an engine block boring machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017174311A1 (de) * 2016-04-04 2017-10-12 Nagel Maschinen- Und Werkzeugfabrik Gmbh Honmaschine mit mehreren arbeitsstationen, fertigungsanlage

Also Published As

Publication number Publication date
EP1908541B1 (de) 2009-12-16
FR2906747A1 (fr) 2008-04-11
ATE451992T1 (de) 2010-01-15
DE602007003790D1 (de) 2010-01-28
FR2906747B1 (fr) 2009-05-15

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