DE1070955A1 - - Google Patents

Description

The Errinduiig relates to a device for simultaneous deep rolling of the fillets and the tread on the crank pins and bearing points of crankshafts.

It is known since ij caused by Dauerbeansprucliung S or vibrational stress fractures of crankshafts at the transition points of the bearing pin to the take FCurbelwangen or hairline cracks in the tread its output. It is also known to roll down these critical points and thus to consolidate the material structure on the surface by applying pressure.

In addition to the known devices, the machining of each individual bearing pin is carried out after the invention, both the tread and the hollow wedge Ien frictionally through 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, is not affected by ao such forces are used that can cause the crankshaft to bend.

It is the task of finding. despite the harmless effect of the high forces required, to keep them as small as possible, since the small space available between the 5 crank carriages makes it difficult to mount the deep rolling rollers. In solving this problem according to the invention, it is possible to use deep-rolling rollers with the smallest diameter, which result in the smallest contact surfaces with the workpiece. This increases the specific surface pressure while maintaining the same contact pressure.

The object 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 rollers on the fillets of the crank pin or abut the bearing point and in a manner known per se on a common race 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 and radial forces are not exerted on the workpiece. Ks can very small work roles are used. so that the absolute rolling forces are kept small be able.

The common race for the deep rolling roller of the fillet is axially displaceable. This also makes preprocessing
for simultaneous deep rolling
the fillets and the tread
on the crank pins and bearings
of crankshafts

Applicant:

Wilhelm Hegenscheidt
Limited partnership,
Erkelenz (Rhld.)

Dipl.-Ing. Theodor Dombrowski, Erkelenz (Rhld.), has been named as the inventor

then a pressure equalization of the mentioned [- "estwalzrollcii and their exact application in the groove ensured, if the distance between the two flutes from the radial center of the device is unequal.

The two cylindrical deep rolling rollers are arranged axially offset from one another in this way. that a festival roller is supported on the right-hand side, the second fixed roller on the left-hand side of the bearing position. It there is the advantage that the accumulations of material produced by the fillet rollers on both cylinder surfaces are rolled down by the cylindrical rollers, so that during subsequent grinding on there is less material to remove 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. With this embodiment of the invention several Bearing points are rolled down at the same time. The crankshafts to be machined do not require any centering and no restraint. They are inserted into the device: the tools center and clamp themselves the workpiece.

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

909 631 / t

BATH ORIGINAL &

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. An exemplary embodiment of the invention is shown in the drawings. 1 shows a section along line II in FIG. 2, FIG. 2 shows a plan view of the device according to FIG. I, FIG. 3 shows a section along line II - in FIG. I, FIG. 4 shows a section according to line III-III in FIG. 3, FIG. 5 shows a view according to line IV-TVr in FIG 'stored. Both master shafts carry a gear 6 and 7 of the same size on the drive side, which mesh with the gear 8 mounted in the frame. The gear 7 receives its drive from your pinion 9 on the shaft of the motor 10. On each of the crank pins 11 and 12 of the master shafts 2 and 3, a two-sided Mebel 13 is mounted, on one side of which the cylindrical deep rolling rollers 19 and 20 and on the other side of the Mydraulikzyliu the 16 is attached. At the same time, a two-sided lever 18 is mounted in the pin 17 of each two-sided Mebels 13, which on one side carries the deep rolling rollers 14 and 15 for the fillets, on the other side via the joint.21 the piston rod.22 and the piston 23, which in the Cylinder 16 slides. The axis of rotation of each I folilkelilou fixed roller 14 and 15 closes with the workpiece axis at an angle of about 45 ° fin. The deep-rolling rollers 14 and 15 are supported on the one hand in the grooves of the pivot pin, and on the other hand in the grooves each with a race 25. which are mounted on Rolzeii 27 via roller bearings in the bilateral levers 13. Here deep-rolling rollers 14 and 15 are guided in cages 28. A lever 18 is fastened in a groove. They have play in the cage 28 on their side surfaces on both sides, so that the 4.ϊη angle formed by the 4 "axis of the deep rolling rollers 14 or 15 with the axis of the crank pin 24 can be larger or smaller if the symmetry of Crank pin 24 and deep rolling frame do not match. Γη the levers 13 deep-rolling rollers 19 and 20 are stored. which machine the running height 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 ilen 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 at a pressure lower than the 1 sheet 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 two-sided helm 13 and 18 into 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, before the engine is switched off, directs the pressurized oil to both sides of the piston 23, 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 in the crank pin 24 so far that the workpiece, namely the crankshaft 33, can be removed. Pvr uNTANsi · «<ic.itt :; 1. Vorrichtiuig for simultaneous deep rolling of the Holtlkohloti and the running surface on the crank and Lagrrstolleii of crankshafts, characterized in that four Festvvalzrollon (14, 15, 19 and 20) act simultaneously on the Kurbi-Izapfen or the Lagcrstcllcn, of which two Deep rolling rollers (14 and 15) rest against the flutes of the crank pin * (24) or tier bearing position and are supported in a manner known per se on a common raceway (251) and two further cylindrical rollers and diametrically opposed to the aforementioned two Fostwalzrollon (14 and 15) and deep rolling rollers (19 and 20) arranged offset from one another in the axial direction on the l'nifang are supported on the running surface of the crank pin (24) or the bearing point itself. 2. Apparatus according to claim I. characterized in that on each lever (13 and 18) at least two Doppclhcbelpaarc a pair of deep rolling rollers (14, 15 or 19, 20) are arranged for rolling the fillets or the running surface, the deep rolling rollers for the tread-bearing lever (13) mounted on the crank pin (11, 12) of two parallel, synchronously driven crankshafts (2 and 3) and articulated to the levers (18) bearing the deep rolling rollers for the fillets. Considered publications:
German interpretative document No. 1005 869. drawings BAD ORIGINAL Oj