DE2329526A1 - COLD PILGRIM ROLLING MILL FOR PIPE ROLLING - Google Patents

Description

MANNESMANN-MEER Aktiengesellschaft, Mönchengladbach » Ohler Kirchweg 66,

"Cold pilger mill for pipe rolling"

The invention relates to a cold pilger mill for pipe rolling with back and forth previous frame and in this stored caliber rolls, with a device for advancing and / or rotating the rolling stock as well as with a torque and mass balance, with the caliber rollers on the outward stroke and are in working contact with the rolling stock on the return stroke and release the rolling stock for advancement and / or rotation before the upward stroke and before the return stroke.

The invention is based on the assumption that cold pilger mills, for example according to DT-AS 1 602 036, can in principle be equipped with a torque and / or mass balance. In DT-AS 1 602 036 it is pointed out that the economy of a cold pilger mill can be optimally exploited if it is ensured that the rollers release the pipe at both ends of their movement path and that both ends of the stroke path have both an axial feed movement as well as a partial rotation of the pipe is brought about. This confirms a finding laid down in DT-PS 523, which consists in the fact that after each stroke

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can be rotated back and forth once, so that each stroke is a Working stroke is.

In the known caliber whales with jaw calibers, i. H. with caliber rollers, the working caliber length of which makes up only a relatively small part of the circumference of the caliber roller, prepares the turning and advancing, which hereinafter referred to as switching movement, no difficulties, since the remaining circumference of the caliber rollers is so large that it can be easily removed an area for the switching movement in the inlet as well as for the switching movement in the outlet can be branched off.

When using grooved rollers with an extended working groove, for example according to US-PS 3,030,835, in which the grooved rollers are in working contact over more than 270 as viewed on the circumference of the grooved rollers, there is no time for the switching movement · that in US Pat. No. 3,030,835 laid down solution was created in that the caliber rollers only perform a working stroke on the upward stroke, while they through the return stroke suitable devices are lifted from the tube, so that based on the crank drive a period of about 240 is available to the Perform switching movement. However, the entire return stroke is lost as a possible working stroke.

Today's cold pilgrim machines of the applicant, which due to their perfect Torque and mass balancing (DT-PS 962 062 and DT-PS 1 064 461) high working speeds, i.e. high strokes per minute allow, naturally have to deal with the ever shorter absolute switching times as a result of the high working speeds. If an increase in performance is to be achieved through a switching movement in the inlet as well as in the outlet, the use of cold pilger rolling mills known per se ring caliber rolls

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questioned because there is more switching time between the outward and return strokes must be created.

The object of the invention is now, in particular with high-speed cold pilgrim machines to get the time for switching in the run-out without the need for it necessary shifting with the same diameter of the caliber rolls is at the expense of the working caliber length, or with the same working caliber length leads to an increase in the caliber roller diameter. In the first case, there would be a possible increase in performance through switching in the inlet as well as in the outlet is at least partially destroyed again by reducing the working caliber length, while in the second case an increase in the Groove roll diameter to a substantial increase in the moving The size and weight of the cold pilger machine is determined by the diameter of the caliber roller.

A solution to this problem can be achieved according to the invention by that the caliber rolls are known ring caliber rolls during the cold pilgrimage and that a device is provided by means of which the angle of rotation of the Ring caliber rolling is greater than 330 during an outward or return stroke. In a preferred embodiment, the angle of rotation of the ring caliber rollers greater than 360 °.

It is achieved by this. that with the greatest possible length of the working caliber of the ring caliber rollers, there is sufficient time for a switching movement not only in the inlet but also in the outlet.

Should a performance increase desired by the measure according to the invention result do not relate to the length produced, but to the quality of the finished pipe, the cold pilger mill according to the invention can be used for

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Material qualities that are difficult to roll or, for example, for manufacture of ball bearing tubes, where tight diameters and wall thickness tolerances are important, also use them in such a way that the rolling stock is removed before the outward stroke is rotated as well as advanced and only rotated before the return stroke.

In the accompanying figures, the invention is illustrated schematically with reference to FIG Embodiments explained.

It shows

Figure 1 A

Up to 1 C, the ring caliber rollers heal three times during one stroke

FIG. 2 shows the side view of a cold pilger rolling mill

FIG. 3 the roll stand seen in the direction of the roll axis

In Figures 1 A, 1 B and 1 C, the sequence of the rolling process is schematically shown during an upward stroke, wherein in Figure 1A, two ring caliber rollers 1 are at the beginning of the outward stroke. The ring caliber rollers 1 are now moving from the position shown in Figure 1 A in the direction of that shown in Figure 1B Position and obtained after a partial rotation by the amount a working contact with the rolling stock, a tube blank 3, in which a mandrel 2 is fixedly arranged is. The working contact with the tube 3 is maintained over a partial angle b beyond the position shown in FIG. 1B. Then give the ring caliber rollers 1 by appropriate training of their caliber 6 the Free tube 3 and move further by the further partial angle c until they relate to their rotational movement and of course also with regard to their back and forth movement come to a standstill. This standstill is shown in FIG. 1C

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Position reached and marked on the ring caliber rollers 1 with A.T.

Starting from the position according to FIG. 1C, the ring caliber rollers 1 now move while rotating to the left until the starting position shown in FIG. 1A is reached at the inlet dead center ET. From the inlet dead center ET to the outlet dead center AT, there is an angle of rotation of the ring caliber rollers which is composed of the partial angles a, b and c and is greater than 360 in the preferred example shown. In the development, the partial angles a, b and c correspond to the distances a \ b ^N and c \ which add up to the scaffold lift H.

Figures IA, IB and 1 C also show that the ring caliber rolls 1 consist in a known manner of a base body 4 and roll rings 5 placed thereon, the caliber 6 being cut into the roll rings 5. The reference circle diameter of the driving pinion 21 shown in the drawing in FIG. 3 is represented by 7.

FIG. 2 shows a side view of all essential elements of a cold pilger rolling mill with a drive motor 9, which via drive belt 10 a drive

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disc of a crank mechanism 8 drives. The crank mechanism 8 has a crank radius

r. Once attached to the crankshaft are crank rods 12, which form the crankshaft drive 8 to a reciprocating frame 16 and additional balancing weights 14 via a further rod 13, likewise with the crank drive 8 Further balancing weights 15 are connected. At 17 there is a rotary feed device indicated.

In order to be able to achieve an angle of rotation of the ring caliber rollers 1 that is greater than 360 °, the crank radius r is greater than the product -. Π. whereby d is the diameter of the pitch circle 7 of the driving pinion 21, which is shown in the drawing in FIG. Figure 3 also shows the waves

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the ring groove rolls, the stand bed 19 and fixed racks 22, with which the driving pinions 21 are in meshing engagement.

An arrow 18 (FIG. 2) indicates the direction of advance of the rolling stock.

- patent claims -

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Claims (6)

Case 8917 PATENT CLAIMS 1.) Cold pilger mill for pipe rolling with a reciprocating frame and caliber rolls stored in this, with a device for advancing and / or rotating the rolling stock as well as with a torque and mass compensation, the caliber rolls on the outward stroke and on the return stroke with the rolling stock are in working contact and release the rolling stock for advancement and / or rotation before the forward stroke and before the return stroke,
characterized, that the caliber rolls are known ring caliber rolls during the cold pilgrimage (1) and that a device is provided by means of which the angle of rotation of the ring caliber rollers (1) during an outward and return stroke is greater than 330 °. 2. Cold pilger mills according to claim 1, characterized in that the The angle of rotation of the ring caliber rollers (1) is greater than 360. 3. Cold pilger mill according to one of claims 1 and 2, characterized in that that the angle of rotation of the ring caliber rollers (1) is smaller than the angle determined by the working caliber length (b) plus the double the difference between this working caliber angle and 360. 4. Cold pilger mill according to one of claims 1 to 3, characterized in that that the scaffold stroke (H) is greater than the pitch circle circumference of the fixed toothed racks (22) of the scaffold bed (19) in tooth engagement / 8 509811/0401 on the shafts (20) of the ring caliber rollers (1) arranged driving Pinion (21). 5. Cold pilger mill according to claim 4, with a crank drive (8) for the Movement of the frame (16), characterized in that the crank radius (r) is greater than the product - ^ 'Π, where d is the pitch circle diameter of the driving pinion (21). 6. Process for the manufacture of pipes by cold pilgrims, in particular using a cold pilger machine according to claims 1 to 5, characterized in that the rolling stock is rotated before the outward stroke and is advanced and only rotated before the return stroke. Dipl .-! No Pa 50981 1/0401