DE1943261A1 - Process for grinding crankshafts and crankshaft grinding machine - Google Patents

Description

1943261 Andrejewsici & Honke patent attorneys

Physicist Or. Walter Andrejewski

α ι. L. ^? In / TM Graduate Engineer

Legal file: 53 210 / Ti ^ ^ ^^

Essen, August 25, 1969 KeHwiger Strasse 36 ' ^fch '

Patent application

ENGLISH STEEL CORPORATION LIMITED

River Don Works,

Sheffield, SQ 2RZ / - England -

Process for grinding crankshafts and crankshafts grinding machine.

The invention relates to a method for grinding Crankshafts, especially those with thick crankpins, as well as a crankshaft grinding machine suitable for this purpose.

The grinding of the crankpins of crankshafts can be done in different ways Wise carried out, it is known, inter alia, to clamp the crankshaft non-rotatably and a rotating grinding wheel in a circular path around the dragging crank pin around the same. In this method, however, the larger the diameter the crank pin and the longer the crank arms, the larger the diameter of the grinding wheel must be in order to be unhindered by

0098U / 1329

Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwiger Strasse

the crank arms in a circular path around the crank pin to be able to. This inevitably increases the weight of the grinding wheel and its drive device, and it becomes increasingly difficult to achieve a clean sanding job without constantly reworking or replacing the grinding wheel. As a result of the large dimensions and the considerable weight of the grinding wheels, the replacement of these is also of the kind Grinding wheels time consuming and difficult. Under these circumstances, the actual grinding surface of such large grinding wheels is very narrow and as a result it becomes necessary to To get a perfect finish, replace the grinding wheel at least once.

For polishing elongated metallic workpieces such as pipes, Rods or rods, it is already known, these workpieces without twisting them between parallel paths of two more flexible Feeding abrasive belts that run around pulleys, which are guided in a circular path around the workpieces, with the sanding belt also being set in circulation will. However, the vibrations that arise in these sanding belts do a clean and precise sanding job like them when grinding crankshaft journals is impossible. '

To the disadvantages of the previously common methods for To eliminate grinding of crankshafts, the invention proposes that a flexible grinding belt with outward facing The grinding surface is brought into circulation via a pair of pulleys and guided around the crank pin in a circular path together with the pulleys arranged axially parallel to the crank pin while the one pulley is pressed against the crank pin in such a way that the sole belt between the two runs.

0098U / 1329

Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwiger Strasse 36

This means that the sole belt is supported during the grinding process on its pulley, so that no inaccuracies whatsoever causing vibrations are more to be feared. The accuracy with which the crank pin is ground is of course determined is largely determined by the accuracy of the pulley pressing the abrasive belt against the crankpin. Such a grinding belt is light and the pulleys and others have to be guided in a circular path around the crank pin Parts can also be compared to grinding wheels Grinding of crankshafts of the same dimensions can be made very lightweight. In addition, such Replacing sanding belts much faster than sanding disks and they are much cheaper in comparison with corresponding grinding wheels, regardless of their grain size or width.

Preferably, of the pulley pair over which the Sole belt is led away, only the one pulley is driven, while the other belt pulley pressing it against the crank pin is designed as a loose disk. Appropriately this idler pulley is shifted relative to the drive pulley to adjust the belt tension, while on the other hand this tension the sole if belt can also be adjusted using a tensioning pulley. Preferably the abrasive belt with its pulleys axially shifted to the crank pin if the grinding belt is narrower than the crank pin. This way you can use Grind crank pins of different lengths on the same belt width, which means that the storage of the grinding belts is essential is facilitated. In order to be able to move from one crank pin to another of the crankshaft, the crankshaft is expediently moved in or preferably with their holders in the axial direction. The crankshaft is preferably clamped on their journals.

00981 Ul 1329

Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwiger Strasse

The sole grinding process can be carried out as wet grinding, especially when it comes to grinding off a relatively large amount of material, with the coolant expediently running continuously is cleaned and put back into circulation, while on the other hand the grinding process according to the invention is naturally also suitable for dry sanding.

A crankshaft grinding machine according to the invention, consisting of a machine frame with a displaceably arranged thereon P Clamping device for the crankshaft as well as one which sets a grinding tool in rotation and at the same time in a circular path the device leading around the crank pin to be ground is characterized in that on the machine frame connected to one another in the longitudinal direction, bed slides that can be pushed back and forth with side slides arranged on them and are provided on these fixed crankshaft holders and the machine frame from an upright Frame part is spanned, which has an axially parallel in it to a crankshaft clamped in the holders by means of a Drive rotatable tool carrier carries, on one side of which at least two pulleys axially parallel to him . a sanding belt looped around it with an outward-facing- " the grinding surface are attached, with a drive for a pulley and a second pulley opposite the Tool carrier axis shifting arrangement are provided.

If in such a crankshaft grinding machine a crankshaft is clamped in the holder in such a way that the crank pin to be ground is aligned with the axis of the tool carrier and lies in the same plane as the sanding belt and its pulleys, the tool carrier is around this crank pin

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Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwiger Strasse

rotated around and the abrasive belt around its pulleys brought into circulation, the one pulley being approached to the axis of the tool carrier in such a way that the grinding belt rests in sliding contact on the crank pin to be ground, around which it is guided in a circular path. There In such a machine, the masses to be guided around the crank pin to be ground are significantly smaller than the masses The mass of a corresponding grinding wheel, and consequently the resulting centrifugal forces are lower, is once the The power requirement of such a machine is significantly lower than that of a machine equipped with a grinding wheel and Such a machine can also be made much lighter due to the reduced centrifugal forces.

The belt pulley pressing the grinding belt against the crank pin to be ground is preferably designed as a loose pulley and the sanding belt is only driven by the other pulley. To adjust the tension of the sole strap or in order to be able to replace the grinding belt, the loose pulley can be arranged to be displaceable with respect to the drive pulley or a special tension pulley can be provided. The diameter of the loose disk is preferably im Compared to that of the drive pulley, it is very large and its running surface is preferably corrugated or otherwise treated in order to avoid it Eliminate possible slippage between it and the back of the sanding belt as much as possible. For driving the Drive belt pulley is expediently an electric motor which is also built onto the tool carrier and which has Sliding contacts and current pick-up rings are supplied with electrical power.

0098U / 1329

Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwtger Strasse 36

In order to be able to swivel the pulley, which presses the grinding belt against the crank pin to be ground, far enough away from the crank arms of the crankshaft during the transition from one crank pin to the next, this pulley is expediently mounted on a swivel plate that can pivot about the axis of the drive pulley. A further motor is expediently provided for rotating the tool carrier and for moving the bed slide of this crankshaft grinding machine. The crankshaft holders preferably have aligned bearings for W the bearing journals of a crankshaft and these bearings are for

Insertion or removal of the crankshaft longitudinally slotted and have clamping or screw bolts for plaguing the crankshaft bearing journals. In this way, a crank pin to be ground can easily be aligned coaxially with the tool carrier will.

To the crankshaft grinding machine according to the invention for wet grinding to be able to use, it expediently has a Pump, feed lines and drains for the coolant circulation with centrifugal or magnetic separator installed in it. In addition, additional facilities for grinding can be found on the tool holder

* and polishing the surfaces of the crank arms and the throats between

* them and the crank pin are provided at the same time as grinding a crankshaft pin.

A more detailed explanation of the invention can be found in FIG The following description of a preferred embodiment of a crankshaft grinding machine according to the invention with reference to FIG Attached drawing, which shows this machine with a clamped crankshaft in perspective.

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Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwiger Strasse 36

The sewing machine consists of a machine frame 1, holders 2 for a crankshaft 5, two interconnected by a shaft 5 Bed slide 4, which can be moved back and forth parallel to the longitudinal direction of the clamped crankshaft. on this bed slide sits transversely displaceable side slides 6 which carry the crankshaft holder 2. The machine frame is spanned by an upstanding frame part 7 which, in bearings (not shown), forms an annular tool carrier 8 accommodates rotatably, the axis of this tool carrier running parallel to the longitudinal direction of the crankshaft and a Electric motor 9 is provided, which rotates the tool carrier in this frame part 7 via a reduction gear 10 offset, while a gear is attached to the frame part 7, via which the bed slide via a lead screw 12 or a rack mechanism can be moved.

The side slides 6, which are transversely displaceable on the bed slide and carry the crankshaft holder 2, are not shown Guide spindles with square head 15 and adjusting wheels // 4 can be moved in the transverse direction of the machine. The crankshaft holder 2 have split bearings 15 with clamping bolts or screws 16 for receiving the crankshaft journal 17, so that a crankshaft journal 18 to be ground is coaxial with the tool carrier 8 can be aligned.

This tool carrier 8 has parallel guides 19 for one radially adjustable slide 2OA, which carries two pulleys 21A and 21B, which are arranged parallel to the crankshaft journal are and over which a flexible abrasive belt 22 with the outside lying grinding surface is laid around, while a tension roller is provided for tensioning the belt and also a

0098U / 1329

Patent attorneys Dr. W. Andrejewski, Dr. M. Honk ©, 43 Essen, Kettwiger Strasse

Electric motor 24 for driving the pulley 21B via a Gear 25, which runs around the outside of the tool carrier Current collection rings 26 and in a housing 27 on the Frame part 7 arranged and therefore not visible sliding contacts is fed. The belt pulley 21A is designed as a loose disk and is grooved on its running surface so that © is achieved in the highest possible coefficient of friction between her and the sole belt 22. The loose disk 21A and the Tensioning pulleys 23 sit on a plate 29 which can be pivoted about the axis of the drive pulley 2IB, so that the loose pulley 21A is wide enough of the crankshaft can be swiveled away when a crank pin is finished and the grinding process is on The next crank pin is to be repeated. This swivel plate 29 is shown in the drawing in the position in which it brings the loose disk 21 furthest inwards, whereby it is held in place by a locking screw 30, through an arcuate slot 31 in the pivot plate passes through. The position of the tension roller 23 can be by moving their support pin 32 in a corresponding one Reach slot 33 in the swivel plate, although an adjustment by means of a spindle or the like would alternatively be conceivable. The slide 20A is in the guides ie by means of not shown Movable spindles, which are embedded in the tool carrier and are turned by hand, albeit another one Motor with an appropriate gear for driving these spindles could be provided on the carrier whose Power supply in a similar way to the supply of the electric motor 9 could be done.

To grind a crankshaft, the crank to be grinded " pin 18 set so that it is coaxial with the tool carrier

0098U / 1329

Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwiger Strasse

if the aisle runs, the loose disk 21A becomes a crank pin pivoted so that the sanding belt running over them rests on the crank pin with the necessary sole pressure. The tool carrier is then set in rotation so that the loose disk 21A is on a circular path around the crankshaft journal down while driving the drive pulley 21B and thereby the sanding belt is brought into circulation.

Compared to a grinding wheel for grinding large crankshafts is the weight of the sole strap 22 and pulleys 21A, 21B and 23 as well as the other rotating parts are very small. In addition, the sole strap 22 can be easily moved exchange and is also independent of its dimensions and its sole grain in comparison with a corresponding one Grinding wheel very inexpensive. On the other hand, the Form the sole belt 22 and the loose pulley 21A narrow enough to in order to be able to grind the shortest crank pin that is conceivable on a crankshaft to be machined on such a machine is, and the crankshaft 3 is by displacement of the bed slide 4 and with them naturally also the side slide and the crankshaft holder 2 axially displaced, for what purpose the lead screw 12 is set in rotation via the motor 9. This great mobility of the crankshaft enables one easy transition from one crank pin to the next after the swivel plate 29 has been swiveled to the loose disk 21A and bring the abrasive belt 22 out of reach of the intermediate crank arms.

0098U / 1329

Patent attorneys Dr. W. Andreiewslci, Dr. M. Honke, 43 Essen, Kettwiger Strasse

10

For wet grinding, especially during pre-grinding, the machine has a pump (not shown) with feed lines and drains for the circulation of a coolant, which is constantly cleaned by a centrifugal or magnetic separator. Additional devices can also be installed on the tool carrier, for example on a further slide 20B between the guide rails 19, in order to move the surfaces of the Crank arms and the throats between them and the crank pin to be able to grind and polish this crank pin at the same time as grinding

Expectations:

009 8 U / 1329

Claims (1)

Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwiger Strasse Expectations 1. Method for grinding crankshafts, in which the The crankshaft is clamped in such a way that it cannot be rotated and a rotating grinding tool is guided in a circular path around the crank pin to be ground while resting on the same, characterized in that a flexible grinding belt (22) with an outwardly facing grinding surface is brought into circulation over a pair of pulleys (21A, 21B) and, together with the pulleys arranged axially parallel to the crank pin, in one Circular path is guided around the crank pin, while the one pulley (21A) is pressed against the crank pin that the sanding belt runs between the two. 2. The method according to claim 1, characterized in that the grinding belt (22) of the one pulley (21B) in circulation and the belt pulley (21A) pressing it against the crank pin (18) to be ground is designed as a loose disk. >. Method according to claim 2, characterized in that the The loose pulley (21A) is moved to adjust the belt tension in relation to the drive pulley (21B). 4. The method according to claim 1 or 2, characterized in that the tension of the sole belt (22) is adjusted by means of a tensioning roller (23). 5. The method according to any one of claims 1-4, characterized in that! For grinding crank pins of different lengths (L8) with one and the same grinding belt (22 ^ the latter with its pulleys (21A, 21B) is moved axially to the crank pin. 009814/1329 Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Emm, Kettwiger Strasse 6. The method according to claim 5, characterized in that for Achieving a greater axial displacement of the crankshaft® (>) is moved in or with their supports (2). 7. The method according to any one of claims 1-6, characterized in that that the crankshaft (3) is clamped with its bearing pin (17) in the supports (2). 8. A method according to any one of claims 1-7, characterized marked w characterized in that the SohleifVorgang is carried out as wet grinding. /$.J crankshaft grinding machine, consisting of a machine frame with a displaceably arranged clamping device for the crankshaft as well as a device which sets a grinding tool in rotation and at the same time guides it in a circular path around the crank pin to be ground, characterized! that on the machine frame (l) in the longitudinal direction of the same interconnected back and forth sliding bed slides (4) with side slides (6) arranged thereon and crankshaft holders (2) attached to them are provided. and the machine frame from a high standing rack "part (7) is spanned, which one in it axially parallel to a crankshaft (3) clamped in the holders by means of a Drive (9) rotatable tool carrier (8) carries, on one side of which at least two belt pulleys (21A, 21B) axially parallel to it with a sole belt around them (22). are attached with the grinding surface facing outwards, with a drive (24) for the one belt pulley (21B) and one the second pulley (21A) opposite the tool carrier axis displacing arrangement (20A) are provided. 0098U / 1329 Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwiger Strasse 36 10. Crankshaft grinding machine according to claim 9, characterized in that that the belt pulley (21A), which can be moved with respect to the tool carrier axis, is designed as a loose disk. 11. Crankshaft grinding machine according to claim 10, characterized characterized in that the loose disk (21A) is attached to the tool carrier (8) for the purpose of adjusting the belt tension in such a way that their distance from the driven pulley (21B) can be enlarged respectively. can be reduced in size. 12. Crankshaft grinding machine according to claim 9 or 10, characterized characterized in that for tensioning the grinding belt (22) a Tension roller (23) is provided. 13 · Crankshaft grinding machine according to claim 10, characterized in that the diameter of the loose disk (21A) is in Compared to the diameter of the driven pulley (21B) is very large. 14. Crankshaft grinding machine according to claim 13, characterized characterized in that the loose disk (21A) has a corrugated running surface (28). 15 crankshaft grinding machine according to one of claims 9-14, characterized in that for driving the one pulley (21B) an electric motor (24) is attached to the tool carrier (8) and there are sliding contacts and power take-off for its supply rings (26) are provided. 0 09 814/13 2 3 Patent attorneys Dr. W. Aridrejowski, Dr. M. Honk®, 43 Essen, KeHwiger Strasse 36 16. Crankshaft grinding machine according to claim 10, characterized characterized in that the grinding belt (22) against the crank pin (18) to be ground pressing pulley (21A) a pivoting plate (29) which can be pivoted about the axis of the driven pulley (21B) is mounted and thereby at transition from one crank pin (18) to another of the crankshaft (3) can be pivoted. 17. Crankshaft grinding machine according to claim I5, characterized characterized in that a further motor (9) is provided for rotating the tool carrier (8) and the bed slide (4). 18. Crankshaft grinding machine according to one of claims 9-17, characterized in that the crankshaft holder (2) with one another have aligned bearings (15) for the bearing journals (17) of a crankshaft (3) and these bearings for insertion or removal the crankshaft are divided lengthways and have clamping or screw bolts (16) for clamping the crankshaft bearing journals. 19 crankshaft grinding machine according to one of claims 9-18, characterized in that for wet grinding a pump, feed lines and drains for the coolant circulation with inserted therein Centrifugal or magnetic separators are provided. 20. Crankshaft grinding machine according to one of claims 9-19, characterized in that the tool carrier (8) additional Facilities for grinding and polishing the surfaces of the crank arms and the grooves between them and the crank pins the same * are planned in good time with the grinding of a pumpkin cone PAe Dr Andrejewski, Dr Honke. 00981 A / 1329