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WO1996007501A1 - Dispositif d'usinage de sieges de soupapes dans des moteurs a combustion interne - Google Patents

Dispositif d'usinage de sieges de soupapes dans des moteurs a combustion interne Download PDF

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Publication number
WO1996007501A1
WO1996007501A1 PCT/CH1994/000173 CH9400173W WO9607501A1 WO 1996007501 A1 WO1996007501 A1 WO 1996007501A1 CH 9400173 W CH9400173 W CH 9400173W WO 9607501 A1 WO9607501 A1 WO 9607501A1
Authority
WO
WIPO (PCT)
Prior art keywords
swivel arm
support column
arm
swivel
clamping
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.)
Ceased
Application number
PCT/CH1994/000173
Other languages
German (de)
English (en)
Inventor
Reto Minelli
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.)
Minelli AG
Original Assignee
Minelli 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 Minelli AG filed Critical Minelli AG
Priority to PCT/CH1994/000173 priority Critical patent/WO1996007501A1/fr
Priority to AU74889/94A priority patent/AU7488994A/en
Publication of WO1996007501A1 publication Critical patent/WO1996007501A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/001—Arrangements compensating weight or flexion on parts of the machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/02—Milling surfaces of revolution
    • B23C3/05—Finishing valves or valve seats
    • B23C3/051—Reconditioning of valve seats
    • B23C3/053—Reconditioning of valve seats having means for guiding the tool carrying spindle
    • B23C3/055—Reconditioning of valve seats having means for guiding the tool carrying spindle for engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
    • B23Q1/38—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members using fluid bearings or fluid cushion supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/44—Movable or adjustable work or tool supports using particular mechanisms
    • B23Q1/50—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism
    • B23Q1/54—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism two rotating pairs only
    • B23Q1/545—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism two rotating pairs only comprising spherical surfaces
    • B23Q1/5462—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism two rotating pairs only comprising spherical surfaces with one supplementary sliding pair
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/10—Auxiliary devices, e.g. bolsters, extension members
    • B23Q3/102—Auxiliary devices, e.g. bolsters, extension members for fixing elements in slots

Definitions

  • the present invention relates to a device for machining valve seats on internal combustion engines in the form of a machine, which forms a complete machining workstation.
  • Valve seat processing machines of this type are used for machining valve seat basic bores, that is to say for turning the valve seat rings on cylinder heads of internal combustion engines, so that these seats can be replaced by new valve seat rings.
  • the new valve seat rings are used after they have cooled down and are then press-fit when they are warmed up to the ambient temperature.
  • such machines also serve to rework valve seats on cylinder heads in order to achieve their exact fit for the valves or to restore them in the course of revision work.
  • Handheld devices are also known for this processing. These have a bearing block which is mounted on an electrically actuated magnetic flange.
  • the magnetic flange has a flat contact surface with which it can be attached to a clamping plate can be put on and fixed there by magnetic forces.
  • the bearing block consists of a bearing column, on which a swivel arm is arranged to be height adjustable. At its end, the swivel arm carries a holder for a swivel ball, through the center of which a guide sleeve runs, in which a work spindle acting simultaneously as a guide mandrel or pilot is rotatably mounted. The work spindle is rotated manually or via an external power source, for example via a flexible shaft.
  • the guide mandrel with guide sleeve and swivel ball can be swiveled on all sides with respect to the device or the machine.
  • the work spindle carries a chuck below the guide sleeve, in which a turning tool can be clamped, usually at an oblique angle to the spindle axis.
  • This rotary steel has for turning the V entilsitzringe to one or two cutting edges, for Nachbe ⁇ of the valve seats processing in the valve seat rings on the other hand preferably three or more cutting edges at certain angles to one another.
  • the spindle is inserted from the side of the valve seat into the valve guide of the valve seat to be machined.
  • a work spindle that is as precise as possible is selected as a pilot, which has as little play as possible when inserted into the valve guide and accordingly assumes a clear position in it.
  • the direction of the work spindle defined in this way serves as a reference for the machining tool rotating about the spindle axis.
  • the swivel ball is therefore braced in the holder. This defines the position of the spindle axis for the actual machining. It is of the utmost importance for the precision of the machining that this positioning takes place with the greatest accuracy.
  • a disadvantage of conventional processing devices is that the work spindle is mounted without play in a movable machine part which has a considerable mass and which is positioned and clamped together with the spindle. Because large masses that cannot be moved without friction must be moved during the positioning, it is clear that the accuracy of the positioning suffers because the guide mandrel can hardly assume a sufficiently low-stress position.
  • the holder In the case of handheld devices, the holder consists, for example, of a hole in the front part of the swivel arm, which has concave inner surfaces, so that the swivel ball is between them is held.
  • the edge of the bore In the hand-held device, for example, the edge of the bore is divided in two by a radial gap, and the two parts can be contracted at right angles to this gap using a clamping screw.
  • it is inevitable that the work spindle is somewhat tensioned when the swivel ball is tensioned because reaction forces act on the work spindle due to the mechanical tensioning mechanism and the tension is slightly increased due to the not quite symmetrical tensioning the page is pulled.
  • the machining is carried out by rotating the guide mandrel and the spindle with the turning tool and slowly lowering it in the swivel ball bearing.
  • the turning can be done by hand or by means of a mechanical, electrical, hydraulic or pneumatic drive means.
  • the clamping forces that can be achieved on such devices by means of the mechanical bracing do not entirely exclude that the working spindle direction shifts slightly during machining due to the reaction forces that occur, which of course impairs the precision of the machining.
  • valve seat processing devices with an electronic centering device for the guide mandrel.
  • the holder has two clamping rings, between which is located the pivot ball, said clamping rings have degrees of freedom in the horizontal plane with respect to the pivot arm two Frei ⁇ .
  • a work spindle is deliberately chosen that has play in the valve guide. points, which is then averaged out by the device's own electronic centering device with servomotors, after which the work spindle is clamped between the clamping rings by mechanical clamping of the swivel ball.
  • These valve seat processing devices are complex and correspondingly expensive. Their operation and maintenance also place higher demands on the user. They enable high-precision processing that meets the highest demands.
  • Figure 1 is a side view of the device in the form of a machining work station
  • Figure 2 is a view of the device in the form of a processing workstation seen from the front;
  • Figure 3 is a view of the support column standing on a slide plate seen from the side, in a section;
  • Figure 4 is a view of the support column standing on a sliding plate seen from the front;
  • FIG. 5 a partial section through the swivel arm, through the holder with the clamping rings and the swivel ball with guide sleeve and pilot, seen from the side;
  • Figure 6 The swivel arm according to Figure 5 from above, partially in a section;
  • Figure 7 A machining tool to be placed on the spindle, seen from below;
  • Figure 8 A processing tool for placing on the spindle, seen from the side.
  • the new device turns away from the conventional practice with permanently installed processing machines to roughly align the cylinder head with the processing tool. Rather, the machining tool should be able to be perfectly adapted to every clamping position of the cylinder head.
  • the cylinder head is therefore only clamped onto the machining table in such a way that the valve seats are generally accessible from above. All adjustment work is then no longer carried out on the workpiece to be machined, but on the processing machine, that is to say on the device according to the invention.
  • it has a frame 1 with feet 2.
  • a flat, horizontally running cast iron plate 3 is mounted as a directional plate, on which two clamping elbows 4 are screwed.
  • These clamping elbows 4 each have a flat surface 5 at the top, which is pivotable about the horizontal axis 6.
  • the surfaces 5 of these clamping elbows 4 can be mechanically clamped in any pivot position by means of the clamping screw 7.
  • These clamping elbows 4 can be moved laterally on the device, that is to say perpendicular to the plane of the page in FIG.
  • a T-slot 8 is milled out, in which a T-core 9 runs, which can be clamped against the top by means of the clamping screw 10, so that the clamping angle pieces 4 can be firmly clamped along the T-slot 8 in any horizontal displacement position.
  • Separate clamping means 11 are firmly mounted on the surfaces 5 of the clamping elbows 4. With these clamping means 11, a cylinder head, which is placed on the elbow surface 5 in a tumbled manner for machining, can be mechanically firmly clamped thereon. Behind the clamping elbows 4, shown here to the right in FIG. 1, the gray cast iron plate 3 extends and forms a sliding plate 59 for a sliding base 13. This sliding base 13 can be moved back and forth on the sliding plate 59 perpendicular to the plane of the drawing sheet , wherein compressed air flows out through air holes on its lower, flat side, so that an air cushion is formed, and therefore the sliding base 13 is moved without friction.
  • a support column 14 is fixedly connected to it on the sliding base 13.
  • the entire machining unit 15 is placed over this support column 14 from above. For this purpose, it has a precise sleeve 16. In the longitudinal center thereof, a round groove is recessed inside, into which compressed air can be pumped. Thus, the sleeve 16 is air-borne coaxially around the support column 14.
  • a pivot bearing 18 is installed in the upper support column end 17, in which a small horizontal support arm 19 is rotatably mounted. At the rear end of this support arm 19, a vertically extending tube 20 is attached.
  • a gas pressure spring 21 is attached to the inside of this tube 20. arranges.
  • a thin steel cable 22 runs behind the gas pressure spring 21 in the vertical direction and is attached to the small support arm 19 at the top.
  • This steel cable 22 runs below a loose, that is vertically displaceable in the tube 20 guide roller 23, which is pressed by the gas pressure spring 21 down. From there, the steel cable 22 in turn runs vertically upwards, there via a fixed deflection roller 24 mounted on the support arm 19, and from there horizontally to a further fixed deflection roller 25 at the front end of the support arm 19. It wraps around this deflection roller 25 three times, whereby a certain frictional resistance is generated, and from there the steel cable 22 runs vertically downwards, where it is finally fastened to the swivel arm 26 in which the work spindle 27 is mounted. With this arrangement, the weight of the swivel arm 26 coaxially air-supported around the support column 14 is compensated for.
  • the work spindle swivel arm 26 is guided longitudinally on a casing in which the tube 20 is also accommodated, so that when it is pivoted about the support column 14, the entire processing unit 15 also pivots.
  • the connection to the processing unit 15 is realized via vibration dampers, so that vibrations from the motor 33 in the processing unit 15 are not transmitted to the swivel arm 26. Because the weight of the swivel arm 26 itself is compensated, it can be moved up and down with minimal effort.
  • a handwheel seated above the deflection roller 25, the axis of which runs through the slot 41, allows the adjustment height to be adjusted. This adjustment can be done in one variant also done by means of an electric motor, for example.
  • the swivel arm 26 is pivoted via the pivot bearing 18 and, thanks to the coaxial air bearing, requires only minimal forces.
  • a swivel ball through which the work spindle 27 rotates.
  • the work spindle 27 can thus be pivoted on all sides from the vertical together with the pivot ball in the pivot arm 26.
  • the work spindle 27 is connected via a universal joint 28 to a telescopically extendable universal joint shaft 30, which in turn is connected at the top via a further universal joint 29 to an output shaft 32 fixedly mounted in the drive arm 31.
  • An electric motor 33 is arranged in the rear of the drive arm 31 and drives the output shaft 32 via ribbed belts 34.
  • FIG. 2 The same processing workstation as described in Figure 1 is shown in Figure 2 from the front. Seen, the frame 1 with the feet 2 and the surface plate 3. Wei ⁇ is ter the clamping screws 10 are visible, with which the two S pann angle pieces in each horizontal shift position of the T-groove 8 can be firmly clamped along. 4
  • the clamping means 11 are mounted on the angular pieces 4, so that each see the surface 5 and the clamping blocks 35 of the clamping means 11, the cylinder head can be clamped in the desired position.
  • the support column 14 stands on the sliding base 13, which rests on a sliding plate 59 which forms part of the straightening plate 3. Fixed belt rollers 38 are attached to the top left and right of the frame 1, over which a rubber band 39 extends the width of the sliding base 13.
  • This rubber band 39 has a hole through which the support column 14 protrudes upwards.
  • the rubber band 39 otherwise closes the open frame 1, in which the sliding base 13 can be moved back and forth. This ensures that the slideway of the sliding base 13 is not contaminated.
  • a weight 40 is attached to each end of the rubber band 39, so that the rubber band 39 is always under tension.
  • a plate-shaped, rubber-elastic suction cup 72 protrudes from the machine frame.
  • This suction cup 72 is connected to a hose line which can be pulled out of the interior of the machine frame 1 and is under negative pressure with respect to the atmosphere, the negative pressure being measurable via a manometer 12.
  • An integrated seal test unit is thus implemented.
  • To check a valve seat the associated valve is used and the suction cup 72 is held there in a sealing manner on the opening of the intake or exhaust gas duct opposite the valve. The better the valve seat now fits, the better the valve closes, and the larger it is measured vacuum.
  • a switching console 42 is available, which contains all switches and control displays that are necessary to operate the machine.
  • the control displays are, on the one hand, a manometer 12 for the vacuum of the integrated seal test unit and a 36 for the hydraulic pressure. Otherwise there are also push buttons for hydraulically tensioning and relaxing the individual movable machine parts and for operating the motor 33.
  • FIG. 3 shows the support column 14 and the sliding base 13 seen from the side. It is therefore an enlarged detail from FIG. 1.
  • the sliding base 13 stands on the sliding plate 59, in which a T-groove 84 is milled.
  • a T-core 85 runs in the T-slot 84 and is connected to a hydraulic piston 87 via a tension bolt 86.
  • This stepped hydraulic piston 87 is sealed from the outside by means of two 0-rings 89, 90 and the closed space is opened up by a bore 91 to which a hydraulic line 37 is connected.
  • a compression spring 88 is installed above the hydraulic piston 87, which acts on the piston 87 so that it is pressed against the bottom and the T-core 85 connected to it is freely displaceable in the T-groove 84.
  • the swivel arm 26 is shown in an enlarged view seen from the side.
  • the work spindle 27 carries at its lower end a tool chuck 43 into which the special tool described later fits.
  • This work spindle 27 runs through a swivel ball 44, in which it is rotatably mounted by means of a guide sleeve 56.
  • the swivel ball 44 lies between an upper 45 and a lower clamping ring 46.
  • the lower clamping ring 46 rests on the plate 47 and carries the swivel ball 44 and thus the work spindle 27.
  • the two clamping rings 45, 46 have a horizontal freedom of movement on the plate 47 approx. ⁇ 3mm in each direction.
  • Rubber sleeves 49, 50 are mounted between the swivel ball 44 and the plate 47 or the swivel arm 26, so that the clamping rings 45, 46 and the plate 47 are protected from dirt. In addition, these rubber sleeves 49, 50 cause the work spindle 27 to be centered in the unloaded state, so that each time a new setting is started from the zero position is and the freedom of movement of the clamping rings 45.46 is fully available.
  • the vernier 57 carries the actual work spindle 27 and allows its height to be adjusted by turning the feed nut 58. The machining is therefore carried out by turning the feed nut 58, whereby the cutting tool is slowly lowered.
  • the work spindle 27 is finally driven via the shaft 60, the latter being driven by a telescopic extendable universal joint shaft 30 via a universal joint 28 shown in FIG. 1.
  • the special feature of the swivel ball holder shown here is that it can be braced hydraulically.
  • a clamping sleeve 48 with an inner projection 51 at the top is placed over the upper clamping ring 45 from above.
  • the clamping sleeve 48 has an outer projection 52.
  • the outer side of the clamping sleeve 48 is sealed off from the space 53 outside its outer wall by means of O-rings 62, 63.
  • This space 53 is delimited at the top by a steel ring 64, which is firmly screwed to the swivel arm 26.
  • the space 53 is designed as a pressure space. It can be filled with hydraulic fluid via the bore 54, which is closed with a pin.
  • a bore 55 On the other side of the pressure chamber 53, a bore 55 first leads along the swivel arm 26 into the interior thereof and from there at a right angle to the outside, where it opens laterally on the swivel arm 26.
  • a halogen lamp 61 is also drawn in, which ensures optimum illumination of the work place.
  • the swivel arm 26 shows the elements for their storage and clamping on the support column 14.
  • the bore 70 for the support column 14 can be seen drawn in with dashed lines. In the longitudinal center of this bore 70, a wide circular groove 73 of very shallow depth is excluded. Compressed air is pressed into this circular groove 73 via the line 74 and the fine bore 75 into the circular groove 73, so that the support column 14 is coaxially supported with compressed air in the bore 70.
  • the elements visible further to the right serve for the hydraulic bracing of the swivel arm 26 on the support column 14 and are described in more detail with reference to FIG. 6.
  • FIG. 6 shows the swivel arm 26 from above.
  • the steel ring 64 can be seen, which is screwed to the swivel arm 26 with a plurality of Allen screws 65 and closes off the pressure space 53 below it from above.
  • the bore 55 can be seen, which extends from the pressure chamber 53 in the longitudinal direction of the swivel arm 26, as well as the bore 66 running at right angles to it, which finally opens on the side of the swivel arm 26.
  • a piston 67 is installed so as to be axially displaceable via a threaded sleeve 68, which can be actuated via a handwheel 69.
  • the halogen lamp 61 is also shown in FIG.
  • the bore is further to the rear on the swivel arm 26
  • a bolt 79 which rests on one side of the swivel arm 26 on a shoulder 80.
  • a cover 76 is screwed on, which is designed as a hydraulic piston.
  • the space around the step 82 formed inside by the cover 76 is sealed off from the outside by means of two 0-rings 77, 81.
  • a bore 83 leads into the closed space, to which a hydraulic line 78 leads. If hydraulic fluid is pumped into the closed space, the bolt 79 pulls the two halves of the swivel arm 26 on both sides of the slot 71 and braces it around the support column 14.
  • FIGS. 7 and 8 show a special machining tool for insertion into the spindle tool chuck 43.
  • the tool is shown in FIG. 7 seen from below. It consists of a round tool carrier 96, which is designed in a known manner so that it can be inserted into the chuck 43 of the processing machine or the work spindle.
  • On this tool carrier 96 two separately mounted cutting steels 95 are arranged point-symmetrically about the axis of rotation of the tool carrier 96.
  • the cutting steels 95 made of special hardened steel is screwed onto special cutting steel holders 97 using small countersunk screws 100.
  • These cutting steel holders 97 have a prismatic shape and can be moved along one secant with respect to the tool holder 96 and screwed in any position by means of the Allen screws 98.
  • the tool carrier 96 has corresponding grooves 101, which each run along a secant and each have a profile that corresponds to the profile of the prismatic cutting steel holder 97.
  • the cutting steel holder 97 By displacing the cutting steel holder 97 along the secants or the grooves 101, the cutting edges of the cutting steels 95 are displaced exactly radially to the axis of rotation 99 of the work spindle.
  • the cutting steels 95 on both sides of the tool carrier 96 can be adjusted and screwed so precisely that they protrude exactly the same distance and that the guide mandrel lies exactly in the center. Uniform stress on the tool carrier 96 is thus achieved in that the forces act exactly symmetrically and are therefore balanced.
  • the up and down movement of the swivel arm 26 on the support column 14 also takes place with very little effort, since the swivel arm 26 is suspended on the support column 14 in a weight-compensated manner. Now this guide mandrel lies almost tension-free in the valve guide.
  • the next step is the simultaneous hydraulic bracing of the sliding base 13 and the swivel arm 26.
  • the work spindle is the now braced swivel arm and the braced support column on the device according to the invention can still be shifted horizontally in every direction slightly, approximately ⁇ 3 mm in each direction.
  • the swivel ball 44 can still be swiveled freely on all sides and, of course, rotated. It has therefore only assumed a rough position and it still has some play on the stabilized, firmly clamped swivel arm 26, in relation to its horizontal position and in relation to its swivel position. In addition, it can be freely rotated in the swivel ball. Exactly this game turns out to be cardinal. Now, that is after tensioning the support column 14 and the swivel arm 26, the guide mandrel within the scope of the play or the horizontal freedom of movement of the clamping rings 45, 46 of the swivel ball 44 can be a complete one assume a stress-free position.
  • the clamping rings 45, 46 of the swivel ball 44 of the new device have two degrees of freedom compared to the swivel arm 26 in the horizontal, as described, and are therefore arranged so as to be easily displaceable in this horizontal. After inserting the work spindle into the valve guide, the clamping rings 45, 46 are located approximately in the middle within their two degrees of freedom thanks to the elastic rubber sleeves 49, 50. Any small movement of the end of the swivel arm 26, which is inevitably triggered by its hydraulic bracing with the support column 14, does not result in the work spindle being braced because the mounting of the swivel ball relative to the swivel arm 26 has some freedom of movement in the horizontal direction.
  • the work spindle 27 can therefore remain undisturbed in a tension-free position in that any slight movement of the latter due to its tensioning is absorbed or neutralized due to the freedom of movement of the holder with respect to the swivel arm 26.
  • the swivel ball 44 which carries it is clamped between the two clamping rings 45, 46. According to the invention, this clamping takes place hydraulically, which means that higher clamping forces can be achieved without exposing the work spindle to considerable reaction forces.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)

Abstract

Un dispositif comprend une unité d'usinage (15) mobile dans tous les sens, comprenant une broche de travail (27) montée rotative dans une bille pivotante retenue entre deux bagues de serrage dont la bague inférieure repose, de façon à pouvoir se déplacer horizontalement dans toutes les directions, à l'intérieur d'un bras pivotant (26). Le bras pivotant (26) est réglable en hauteur, suspendu de façon équilibrée et coaxialement monté sur un palier d'air autour d'une colonne de support (14). La colonne de support (14) est dressée sur un socle coulissant (13) monté sur un palier d'air et mobile dans le sens longitudinal sur un plateau coulissant (59). Le socle coulissant (13) placé sur le plateau coulissant (59) et le bras (26) pivotant autour de la colonne de support (14), d'une part, ainsi que les bagues de serrage se trouvant dans le bras pivotant (26), d'autre part, peuvent être hydrauliquement bloqués. Lorsque le bras pivotant (26) et la colonne de support (14) sont bloqués, la broche de travail (27) peut encore se déplacer légèrement d'environ +/-3mm dans toutes les directions, horizontalement. En outre, elle peut encore pivoter et tourner librement dans toutes les directions avec la bille pivotante (44).
PCT/CH1994/000173 1994-09-02 1994-09-02 Dispositif d'usinage de sieges de soupapes dans des moteurs a combustion interne Ceased WO1996007501A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CH1994/000173 WO1996007501A1 (fr) 1994-09-02 1994-09-02 Dispositif d'usinage de sieges de soupapes dans des moteurs a combustion interne
AU74889/94A AU7488994A (en) 1994-09-02 1994-09-02 Device for machining valve seats in internal combustion engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH1994/000173 WO1996007501A1 (fr) 1994-09-02 1994-09-02 Dispositif d'usinage de sieges de soupapes dans des moteurs a combustion interne

Publications (1)

Publication Number Publication Date
WO1996007501A1 true WO1996007501A1 (fr) 1996-03-14

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PCT/CH1994/000173 Ceased WO1996007501A1 (fr) 1994-09-02 1994-09-02 Dispositif d'usinage de sieges de soupapes dans des moteurs a combustion interne

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AU (1) AU7488994A (fr)
WO (1) WO1996007501A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011147770A1 (fr) * 2010-05-25 2011-12-01 Komet Group Gmbh Machine-outil pour tournage
CN109759630A (zh) * 2019-03-05 2019-05-17 东宁晟（北京）数字科技有限公司 一种装配式板件边孔收口便携式加工机

Citations (11)

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US1667918A (en) * 1927-02-01 1928-05-01 Willis Jones Machinery Co Inc Method and apparatus for reseating valves
DE1175964B (de) * 1954-10-09 1964-08-13 Waldrich Werkzeugmasch Gewichtsausgleich fuer in der Hoehe verstellbare Schlitten von spanabhebenden Werkzeug-maschinen, insbesondere Stossmaschinen
CH445254A (de) * 1967-03-01 1967-10-15 Minelli Italo Vorrichtung zum Drehen von Ventilsitzen an Verbrennungskraftmaschinen
US3728940A (en) * 1971-02-01 1973-04-24 Tobin Arp Mfg Co Apparatus for cutting valve seats in engine castings
DE2346633A1 (de) * 1973-09-17 1975-04-24 Wotan Werke Gmbh Fuehrung fuer relativ zueinander bewegbare maschinenteile
WO1980001365A1 (fr) * 1979-01-08 1980-07-10 Harmand Pierre Broche porte-outil pour usinage de precision
DE3904171A1 (de) * 1988-03-02 1989-09-14 Bernd Dipl Ing Hoerner Spannelement mit einer bremseinrichtung an einem druckmittelkolben zur festhaltung bei druckausfall
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EP0478478A1 (fr) * 1990-09-28 1992-04-01 Serdi - Societe D'etudes De Realisation Et De Diffusion Industrielles Procédé et dispositif pour centrer une tige-pilote dans un guide de soupape, en vue de l'usinage de précision d'un siège de soupape

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WO1980001365A1 (fr) * 1979-01-08 1980-07-10 Harmand Pierre Broche porte-outil pour usinage de precision
DE3904171A1 (de) * 1988-03-02 1989-09-14 Bernd Dipl Ing Hoerner Spannelement mit einer bremseinrichtung an einem druckmittelkolben zur festhaltung bei druckausfall
EP0344077A1 (fr) * 1988-05-27 1989-11-29 Serdi - Societe D'etudes De Realisation Et De Diffusion Industrielles Machine d'usinage de précision avec tige pour la détermination de l'axe moyen pratique d'un trou de profil général cylindrique
EP0399924A1 (fr) * 1989-05-22 1990-11-28 Serdi - Societe D'etude De Realisation Et De Diffusion Industrielles Outillage pour usinage de précision par exemple pour la rectification de sièges de soupape
WO1992004152A1 (fr) * 1990-09-04 1992-03-19 Minelli Ag Dispositif pour la determination et le controle de l'avance sur un appareil d'usinage de siege de soupape
EP0478478A1 (fr) * 1990-09-28 1992-04-01 Serdi - Societe D'etudes De Realisation Et De Diffusion Industrielles Procédé et dispositif pour centrer une tige-pilote dans un guide de soupape, en vue de l'usinage de précision d'un siège de soupape

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Publication number Priority date Publication date Assignee Title
WO2011147770A1 (fr) * 2010-05-25 2011-12-01 Komet Group Gmbh Machine-outil pour tournage
US9227282B2 (en) 2010-05-25 2016-01-05 Komet Group Gmbh Machine tool for rotary machining
CN109759630A (zh) * 2019-03-05 2019-05-17 东宁晟（北京）数字科技有限公司 一种装配式板件边孔收口便携式加工机

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