DE1098481B - Multi-mandrel rolling mill - Google Patents

Description

Multi-mandrel ring rolling mill The invention relates to a ring rolling mill for rolling seamless rings made of perforated blocks, discs or the like.

In such ring rolling mills, a roller table is eccentric to one driven profile roller rotatable. Several rolling mandrels are attached to the roller table, which can be designed and adjusted as pre-rolling mandrels or as finishing mandrels. As a result of the eccentricity between the profile roller and the roller table changes during rotation of the roller table, the distance between the folding mandrel and the profile roller is constant. In the When the rolling mandrel approaches the profile roll, the ring blank surrounding the rolling mandrel comes on the mandrel and roller to the plant and is subject to a further rotation of the roller table Rolling process until the distance between the mandrel and the roller begins to increase again. Depending on the desired rolling, the ring can .die rolling zone once or under Action of different rolling mandrels happen several times.

The known rolling mills of this type require the following operating operations: Control of the rolling table movement, application of the blank, removal of the finished rolled Ring and, if necessary, transferring the ring from the roughing mandrel to the next Roughing mandrel or the finishing mandrel. This way of working requires a considerable amount of work Expenditure on physically highly stressed operating personnel limits the performance of the rolling mill by the physical ability of the operator and prevented the execution of exactly the same work cycles - this is therefore the case particularly disadvantageous because the ring rolling mill other facilities, such as presses for Upsetting and punching of the blocks, furnace, further processing machines (d. The like assigned whose work rhythm is caused by an uneven application of the ring rolling mill is disturbed.

It is a multi-mandrel ring rolling mill with, on both sides of the workpiece, axially displaceable roll mandrels become known, in which the finished rolled rings are automatically removed from the roller table by a scraper. The operation of the rolling mill is thereby only insignificantly relieved because of the difficulty in controlling the actual Rolling process cannot be eliminated by this type of construction.

This belongs to processing machines not used for rolling rings it to the state of the art, periodically switched on for the automatic workpiece transport To use rotary tables or the like. These rotary tables that have a pure transport function exercise and their movement depending on automatic machining tools are not suitable for multi-mandrel ring rolling mills. The platen rotation These machines not only transport the workpiece, but also nor the delivery of the rolling mandrels, so that a very specific one, thanks to the technology of the rolling process is required.

In contrast, the ring rolling mill according to the invention enables a high, Application independent of human performance in exactly the same work cycles and thus creates the prerequisites for the automation of the entire ring production with little expenditure on drive and star means. In addition, it leads to a further increase in profitability by saving personnel costs.

This is achieved in that the rotation of the roller table to the between two adjacent roll mandrels lying central angle depending on the covered angular path is automatically controllable so that the angular velocity of the roller table at the beginning of the idle travel of each roller mandrel loaded with a workpiece brought to a maximum value, reduced during the rolling process and at the end of the Rolling process temporarily to the value zero or a standstill-like minimum value is held.

To this speed curve of the roller table rotation with simple To achieve means, the invention further proposes, one in a fixed dependent time Control cam moved by the roller table rotation to change the angular velocity of the rotating roller table.

Another suggestion is to set the control cam for each rotary movement of the roller table by the central angle between two adjacent roller mandrels a standstill for the Have roller table drive and an adjustable time relay is provided to restart the platen rotation be. As a result, the automatic sequence is more periodic with little effort Rolling table rotations enabled, although for easier workpiece change and for perfect calibration of the finished rolled rings. after each work cycle the roller table comes to a complete standstill.

About the automatically and precisely controlled rhythm of the roller table rotation as a control impulse for extensive or complete automation of the entire ring production to utilize, according to the invention, a driven depending on the roll table rotation Master switch or the like for controlling devices assigned to the ring rolling mill, such as workpiece manipulation devices for loading and / or unloading the rolling mandrels, upsetting and punch press, furnace or the like., Can be used.

It is particularly advantageous for loading and / or unloading the Rolling mandrels to use automatic workpiece manipulation devices in which in addition to the actual gripping movement, a pivoting movement around a vertical axis is carried out. If these according to the invention, the Sch .-, venkbe-, movement in the Area of a rolling mandrel that is stationary or moving at very low speed and can be derived from its area of the roller table rotation, separate drive and control means for this movement are not required.

An embodiment of a ring rolling mill according to the invention is shown schematically in the figures, namely Fig. 1 shows a plan view, Fig. 2 shows a section along the line A-B of FIG. 1, but with it pivoted inward Unloading table, FIGS. 3 to 6 simplified plan views in different phases of the Rolling process.

The motor 1 drives via the Vorgel.ege 2, 3 and the bevel gears 4, 5- The profile roller 7, which is mounted with a vertical shaft in the machine frame 6, is eccentric The roller table 8 is rotatably mounted on the machine frame 6 in relation to the profile roller 7. At the A worm wheel 9 is attached to the rolling table 8 and meshes with a worm 10 stands. The worm 10 is driven by the electric motor 11 ″ via the control gear 12, which Counter gears 13, 14, 15 and the worm shaft 16 are driven. On the roller table 8 are offset from one another by 90 ° - # Valzdorne 17, 18, 19, 20 in radial slots 21 of the roller table top 22 adjustably attached and adjusted so that the rolling mandrels 17 and 19 at a greater distance from the center of the rolling table than pre-rolling mandrels, the rolling mandrels 18 and 20 act as finishing mandrels at a smaller distance from the center of the roller table. On the roller table top 22 centering pieces 23, 24, 25, 26 are arranged, the circular centering surfaces 27 are open to the center of the roller table, approximately centric to .den roll mandrels and are slightly larger in diameter than that of the associated Rolling mandrel to be rolled ring diameter.

On the vertical to through the axes of the profile roller 7 and the roller table 8 going level are opposite to each other on the machine frame 6 the loading station 28 and the unloading station 29 are arranged. These stations each consist of one fixed column 30, one with the help of the worm wheel 31 or 31 'around the column pivotable loading table 32 or 32 'and one with the aid of the in the cylinders 33., 33 'sliding Koibein 34 up and down movable gripper 35. The over the path of the Roll mandrels 17, 19 or 18, 20 arranged grippers are not in their details shown and designed so that the gripper of the loading station 28 for gripping a Ring blank, the gripper of the unloading station 29 on the other hand ready for gripping one rolled ring is suitable. The worm wheel 31 of the loading table 32 is on the Worm 36, and worm wheel 31 'of unloading table 32' is over the worm 36 'and the angle drive 37 with the worm shaft 16 for the roller table drive coupled that the loading table 32 and the unloading table 32 'twice around their columns Rotate 30 when the platen 8 makes one revolution, loading table and unloading table always point in the same direction.

The transfer station 38 is attached to the machine frame 6 at the point at which the roller table circumference is furthest away from the profile roller 7. The transfer station 38 consists of a (not shown in detail) on- and movable gripper, similar to the unloading gripper 35 of FIG. 2, wherein the gripper however, it is designed so that it can hold pre-rolled rings.

The worm roller 16 of the roller table drive drives a control disc 40 and a control drum 41 via a worm gear 39. The control disc 40 controls in any known manner, for example by means of control cams that actuate a limit switch 42, the transmission ratio of the control gear 12, for example an electric motor-adjustable oil gear. so that the rolling mandrels 17, 18, 19, 20 pass the stations 28, 29, 38 with a creep speed that differs little from standstill, whereupon the roller table 8 accelerates to its maximum speed and is decelerated again shortly before the start of the rolling process so that the roller table has reached the creep speed at the end of the rolling process. Control cams, cam tracks or the like 43, 44, 45, 46 are arranged on the control drum 41 and serve to actuate control slides, limit switches or the like 47, 48, 49, 50. The cam track 43 controls the movement of the gripper of the loading station 28 via the control slide 47 in such a way that the gripper grabs and lifts a ring blank from the loading table 32 pivoted over the roller table at the crawling speed of the roller table 8 90 ° pivoting of the roller table 8, lowered via a pre-rolling mandrel 17 or 19, releases the ring and then returns to its starting position. The cam track 44 and the control shear 48 .dienst- to control the gripper of the unloading station 29, such that the gripper lifts a ring from a finishing mandrel 18 or 20 at crawling speed of the roller table and during the next creeping movement of the roller table, ie after a -90 ° rotation on which the unloading fish 32 ', pivoted over the roller table, is deposited. The cam track 45 and the slide valve 49 controlling gripper .der transfer station 38 so that the gripper lifts a ring from a pre-rolling mandrel 17 or "19 when the roller table crawls and deposits it after a 90 ° rotation of the roller table around a finishing mandrel 18 or 20 The control cam 46 and the control slide 50 are used to control systems associated with the ring rolling mill, such as an upsetting and piercing press, in the working cycle of the ring rolling mill.

In FIGS. 3 to 6, the parts of the ring rolling mill are only schematic indicated. The roller table 8 is represented by its center lines. The rolling Borne have been omitted, but their reference numbers are entered for the respective location to mark the rolling mandrels. 51 are raw rings, 52 pre-rolled rings and 53 are finished rolled rings. With 54 is an automatic device for discharging the finished Rings indicated.

The mode of operation of the invention is as follows: The roller table 8 is rotated counterclockwise by the electric motor 11 via the control gear 12. The roller table speed is controlled by the control disk 40 so that that each of the rolling mandrels 17, 18, 19, 20 has the smallest distance from the profile roller 7 happens over a roller table rotation of about 2 ° at a crawling speed, which differs only slightly from a standstill. The roller table is then raised Top speed accelerated and up until shortly before the end of the idle travel kept this speed. The subsequent reduction in the roller table speed continues until the next roll mandrel has reached the roll gap and thus the roll table is switched to creep speed again. The profile roller 7 is through the Motor 1 also anti-clockwise, but at the same speed driven.

At the crawling speed of the roller table, a rough ring 51 is dated The gripper of the loading station 28 is placed centrally with respect to the roughing mandrel 17 on the roller table 8. The loading table 32 is meanwhile pivoted away from the roller table and is with a load new raw ring 51 '. The unloading table 32 'of the unloading station 29 is located in the pivoted state over the roller table (Fig. 3).

When the roller table continues to rotate after the loading process has ended initially takes place at increased speed, the loading table 32 rotates over the roller table, the unloading table 32 'rotates outward. Shortly after the start of the When the roll table rotation is slowed down again, the raw ring 51 comes to rest between the pre-rolling mandrel 17 and the profile roller 7. As the roller table continues to rotate, , which takes place more and more slowly, the distance between the roughing mandrel 17 and the profile roller 7 lower, i.e. H. the roll gap is narrower, so that the raw ring 51 is pre-rolled. The narrowest point of the roll gap is at the creep speed of the roll table drive through, so that an intensive rolling of the ring to the pre-rolled ring 52 takes place and the gripper of the loading station 28 the new raw ring 51 'on the meanwhile can grab and lift inwardly pivoted loading table 32 (Fig. 4). The processes which run in the meantime at the other stations, will be later in the corresponding "Context explained.

As the roller table continues to rotate at the speed profile already described, the pre-rolled ring 52 tends to adhere with its end faces to the corresponding mating surfaces of the profile roller 7 and thereby change its position relative to the pre-rolling mandrel 17. The centering surface 27 of the centering piece 23 ensures, however, that all the rings assume the same position with respect to the roughing mandrel and can thus be grasped later by the gripper of the transfer station 38 without difficulty. At the end of the described roll table rotation, the roughing mandrel 17 with the roughed ring 52 is located under the unloading table 32 'of the unloading station 29, which has meanwhile swung back over the rolling table is charged with the new raw ring 51 '. The outwardly pivoted loading table 32 is provided with a further raw ring 51 ″ (FIG. 5).

The further rotation of the rolling table causes the rough ring to be rolled 51 'to the pre-rolled ring 52' between the profile roll 7 and the pre-rolling mandrel 19 in the manner already described. At the end of this roll table rotation, the pre-rolled Ring 52 gripped by the gripper of the transfer station 38 and lifted off the roughing mandrel 17. The gripper of the loading station 28 grips the raw ring 51 ″ on the meanwhile again inwardly pivoted loading table 32 and lifts it. The unloading table 32 ' is swiveled outwards (Fig. 6).

As the rolling table continues to rotate, the pre-rolling mandrel 19 with the pre-rolled ring 52 'passes under the unloading table 32', which is pivoted inward again, and the finishing mandrel 20 under the gripper of the transfer station 38. At the end of the roll table rotation, the gripper of the transfer station 38 lowers and opens, see above that the pre-rolled ring 52 is placed around the finishing mandrel 20 . The roughing mandrel 17 is loaded with the raw ring 51 ″ by lowering and opening the gripper of the loading station 28, while a new blank is brought onto the outwardly pivoted loading table 32 (FIG. 3).

The finishing mandrel is at the end of the next roller table movement 20 with the raw ring 52 under the inwardly pivoted loading table 32 on which the gripper picks up the last placed raw ring, whose fate is in the Description is no longer pursued. The raw ring 51 "became the rough rolled one Ring 52 ". The gripper of the transfer station 38 grips the pre-rolled ring 52 ' and lifts it off the roughing mandrel 19 (FIG. 4).

As the roller table continues to rotate, the pre-rolled ring 52 comes to an end in contact between the profile roller 7 and finishing mandrel 20 and is in the narrowing Roll gap rolled out to the finished ring 53. At the end of this process is the pre-rolling mandrel 17 with the pre-rolled ring 52 "under the unloading table 32 ', the Finishing mandrel 18 under the gripper of the transfer station 38, where it is pre-rolled with the Ring 52 'is loaded, and the roughing mandrel 19 is by the gripper of the loading station 28 charged (Fig. 5).

The centering surface 27 of the centering piece 26 ensures that the rotation continues of the roller table so that the finished rolled ring emerges from the profile roller solves that he is a favorable position for the gripper of the unloading station 29 to the finishing mandrel 20 occupies. At the end of the roller table rotation, the finished rolled ring 53 is dated Gripper 35 of the unloading station 29 gripped and raised (Fig. 6). After the next Working cycle, it is placed on the inwardly pivoted unloading table 32 '(Fig. 3) and after a further work cycle by the ring discharge device 54 from the meanwhile removed the unloading table 32 'pivoted outwards again (Fig. 4). The operations at the other stations are now running as described, so that for everyone second work cycle a finished ring leaves the rolling mill.

Without changing anything to the invention, the ring rolling mill can with analogous Modification of the control can also be used so that with two or four equal set rolling mandrels, the ring is rolled out in one rolling operation. It can also be used in appropriate cases with two consecutive following Rough rolling operations and a finish rolling operation are worked. In this case The position of the fourth roller mandrel remains unoccupied on the roller table. It is also easily possible, the end phase of the rolling process and the loading processes are not at a crawling speed of the roller table, but at a complete standstill to execute. In this case there is an additional function for controlling the movement of the roller table Time relay or the like necessary, which stops the roller table rotation after the set downtime initiates again. The control of the gripper movements can be done without affecting the invention to change something, naturally also take place in such a way that part of the movements in the Phase of faster platen rotation falls.

Claims (5)

PATENT CLAIMS-- 1. Multi-mandrel ring rolling mill with driven profile roller and several roller mandrels arranged offset by the same central angle on a roller table which can be rotated eccentrically to the profile roller with adjustable angular speed, characterized in that the rotation of the roller table (8) around the between two adjacent roller mandrels (17,18 , 19, 20) lying central angle depending on the angular path covered is automatically controllable that the angular speed of the roller table is brought to a maximum value at the beginning of the idle path of each roller mandrel loaded with a workpiece, reduced during the rolling process and temporarily to the value zero or a standstill-like value at the end of the rolling process Smallest value is kept. 2. Multi-mandrel ring rolling mill according to claim 1, characterized by a solid Control cam (40) moved as a function of the roll table rotation to change the Angular speed of the rotatable roller table (8). 3. Multi-mandrel rolling mill after Claim 1 and 2, characterized in that the control cam (40) for each rotary movement of the roller table (8) by the central angle lying between two adjacent roller mandrels has a standstill position for the roller table drive and an adjustable one Timing relay is provided to restart the platen rotation. 4. Multi-mandrel ring rolling mill according to claims 1 to 3, characterized by a function of the roller table rotation driven master switch (41) or the like. Associated with the control of the ring rolling mill Devices such as workpiece manipulation devices (28, 29, 38) for loading and / or Unloading the rolling mandrels, upsetting and piercing press, furnace or the like. 5. Multi-mandrel ring rolling mill according to claim 1 to 4, characterized by automatic workpiece manipulation devices (28, 29) for loading and / or unloading the rolling mandrels, their pivoting movement in the area a stationary roller mandrel or moving at the lowest speed and off its area can be derived from the roller table rotation. Considered publications: German patent specification No. 703 436.