DE1070955B - Device for the simultaneous deep rolling of the fillets and the running surface on the crank pin and bearing points λ on crankshafts - Google Patents

Description

The invention relates to a device for the simultaneous deep rolling of the fillets and the running surface nn the crank pin and bearing point of crankshafts.

It is known that they are caused by continuous stress or by vibrational stress Crankshaft breaks at the transition points between the bearing journals and the crank cheeks or in hairline cracks the running surfaces take their starting point. It is also known to roll and roll these critical points so that the material structure on the surface can be solidified by the action of pressure.

Compared to the known devices, according to the invention, the machining of each individual bearing pin, both the surface and the fillets are frictionally engaged by diametrically opposite one another Tools made so that the substantial required for effective cold deformation Pressure only acts at the work site itself and the crankshaft, which is freely mounted on the tools, does not come through such forces are stressed that can cause bending of the crankshaft.

It is the object of the invention. despite the harmless effect of the high forces required, this should be done as much as possible to be kept small, as the small space available between the crank carriages allows for storage the deep-rolling rollers made more difficult. In solving this problem according to the invention, it is possible Use deep rolling rollers with the smallest diameter that have the smallest contact surfaces with the workpiece result. This increases the specific surface pressure with constant contact pressure.

The problem posed is achieved according to the invention in that on the crank pin or the bearing points four deep-rolling rollers act at the same time, two of which are deep-rolling on the fillets of the crank pin or abut the bearing point and in a manner known per se on a common raceway support and two further cylindrical and the aforementioned two deep rolling rollers diametrically opposite and deep rolling rollers arranged offset from one another in the axial direction on the circumference are attached to the Support the running surface of the crank pin or the bearing surface itself.

This ensures that all bearing points of a crankshaft simultaneously in the specified sense to be edited. Free axial forces and radial forces are not exerted on the workpiece. Ks can very small work rolls are used, so that the absolute rolling forces are kept small can.

The common race for the deep rolling roller of the fillet is axially displaceable. This will also contraption

for simultaneous deep rolling

the fillets and the tread

on the crank pins and bearings

of crankshafts

Applicant:

Wilhelm Hegenscheidt

Limited partnership,

Erkelenz (RhId.)

Dipl.-Ing. Theodor Dombrowski, Erkelenz (RhId.] has been named as the inventor

then a pressure equalization of the mentioned [- "estwalzrolleii and their precise application in the groove.

»5 represents if the distance between the two fillets and the radial center of the device is not the same.

The two cylindrical deep rolling rollers are arranged axially offset from one another in this way. a festival there The roller roller is supported on the right-hand side, the wide fixed roller roller is supported on the left-hand side of the bearing position. It there is the advantage that the material produced by the hollow throat areas on both cylinder surfaces accumulates are rolled down by the cylindrical rollers, so that during subsequent grinding on less material has to be removed from the cylinder surface.

A further improvement is achieved according to the invention in that at least two on each lever Double lever pairs each a fixed roller pair for rolling the fillets or the running surface are, the levers supporting the deep rolling rollers for the running surface on the crank pins of two parallel, crankshafts driven in the same direction, synchronously driven, and articulated with the deep rolling rollers for levers carrying the fillets are connected. at

In this embodiment of the invention, several bearing points can be rolled in at the same time. The too machining crankshafts do not require centering or clamping. You will be in that device inserted: the tools center and clamp the workpiece themselves.

Of the two crankshafts rotatably mounted in the frame of the device, only one is driven by a motor driven. The result is a simple drive because only one crankshaft is driven.

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BAD ORIGINAL ft

Claims (2)

Both the fillets of the crank bearing points and those of the central bearing points are rolled down by a machine at the same time. This makes it possible to build a very powerful machine that is suitable for mass production. In the drawings, an embodiment of the invention is shown. 1 shows a section along the line I- [in FIG. 2, FIG. 2 shows a plan view of the device according to FIG. 1. FIG. 3 shows a section along the line ΙΙ-Γί in FIG Section along line ΙΙΤ-ΓΙΙ in FIG. 3, FIG. 5 shows a view along line IV-TV in FIG. 4. In frame 1, there are two identical crankshafts 2 and 3 as master shafts in bearings 4, 4 'and 5 , 5 'stored. Both master shafts each have a gear 6 and 7 of the same size on the drive side, which mesh with the gear 8 mounted in the frame 1. The gear 7 receives its drive from the pinion 9 on the shaft of the motor 10. A bilateral lever 13 is mounted on each of the crank pins 11 and 12 of the master shafts 2 and 3, on one side of which the cylindrical deep rolling rollers 19 and 20 and on the other side of which the hydraulic cylinder 16 is attached. At the same time, in the pin 17 of each bilateral lever 13 there is a bilateral lever 18 as mounted, which on one side flit deep rolling rollers 14 and 15 for the fillets, on the other side via the joint, 21 carries the piston rod c22 and the piston 23, which in the Cylinder 16 slides. The axis of rotation of each hollow Fesi rolling roller 14 and 15 forms an angle of approximately 45 ° with the workpiece axis. The deep rolling rollers 14 and 15 are supported on the one hand in the fillets of the crank pin * and on the other hand in the running groove !! one Γ..infringes 25 each. which are mounted on bolts 27 via roller bearings in the two-sided levers 13. The deep rolling rollers 14 and 15 are guided in Käl'ige 28 which are each fastened in a groove of a lever 18. They have play in the cage28 on their side surfaces on both sides, so that the 45 ° angle formed by the axis of the deep rolling rollers 14 or 15 with the axis of the crank pin 24 can become larger and smaller if the symmetry of the crank pin 24 and Deep rolling device do not match. Deep rolling rollers 19 and 20 are mounted on the levers 13 and work on the running surface of the crank pin 24. These deep rolling rollers 19 and 20 are arranged offset from one another, their area of action overlapping. The deep rolling rollers 19, 20 are mounted in the levers 13 via needle bearings 31 on bolts 32. The device works as follows: The workpiece is freely placed on the rollers 19 and 20 located in the lever 13 in such a way that each crank pin of the new crankshaft 3 is parallel to the crank pin of the master shafts 2 and 3. Now the pistons 23 are acted upon by pressurized oil on their underside, the deep rolling rollers 14 and 15 move towards the crank pin 24 to be machined and are held in the working position with a pressure which is lower than the working pressure. The motor 10 is now switched on and at the same time the oil pressure in front of the piston 23 is increased to the required working pressure. This can be done automatically, for example, by a solenoid valve located in the circuit of the motor 10. The driving force of the motor acts via the pinion 9 and the gears 7, 6, 8 on both master shafts 2 and 3, which bring the bilateral levers 13 and 18 in a circular motion. The motor 10 remains in operation for a certain time known from experience and is switched off after this time has elapsed. Care must be taken that the working pressure on the work rolls is reduced before the engine comes to a standstill. This can be done, for example, by the solenoid valve, which directs the pressure oil to both sides of the piston 23 before the engine is switched off, so that only the surface of the piston rod 22 is effective, the inertia of the rotating masses ensuring a gradual discharge. The piston 23 is then acted upon with pressurized oil so that it is driven downward. As a result, the lever 18 moves around the pin 17. and the tools 14 and 15 attached to it move away from the crank pin 24 so far that the workpiece, namely the crankshaft 33, can be removed. PaTHNTANSI'HOCII IC; 1. Device for simultaneous deep rolling of the fillets and the running surface on the crank Lagerstelleii of crankshafts, characterized in that on the crank pin or «leu Bearing points, four deep-rolling rollers (14, 15, 19 and 20) act simultaneously, two of which are deep-rolling rollers (14 and 15) on the fillets of the crank pin (24) or tier bearing te lh 'and each other support in a manner known per se on a common race (25) and two more cylindrical ones and the aforementioned two deep rolling rollers (14 and 15) diametrically opposite and on Deep rolling rollers (19 and 20) which are arranged offset from one another in the axial direction are attached to one another the running surface of the crank pin!) (24) or the I .alierstelle itself. 2. Apparatus according to claim I. characterized in that on each lever (13 and 18) at least two pairs of double levers each have a pair of deep rolling rollers (14, 15 or 19, 20) for rolling the fillets or the running surface are arranged, with the Deep rolling rollers for the lever (13) carrying the running surface are mounted on the crank pins (11, 12) of two parallel, synchronously driven crankshafts (2 and 3) and are articulated to the levers (18) carrying the deep rolling rollers for the fillets. Considered publications:
German interpretative document No. 1005 869. 1 sheet of drawings BATH ORIGINAL