CS221286B2 - Facility for blocking the axial shift of the hollow blooms - Google Patents

Abstract

In the initial rolling of a hollow billet 16 the billet (16) is held against axial movement in the feed direction. This is accomplished using an abutment member (1) mounted relative to the roll stand (10) for movement into the roll gap from the side opposite the mandrel (15) upon which the billet (16) is borne. The abutment member (1) is held in its working position adjacent the plane containing the axes of the pilger rolls (14) during the initial rolling stage and then removed from the path of the rolled billet thereafter. The method reduces the high stresses suffered by the rolling mill. <IMAGE>

Description

BACKGROUND OF THE INVENTION The present invention relates to a device for blocking the axial displacement of a hollow billet pushed onto a mandrel into a pilger mill.

It is known to dampen the energy that was given to the billet before it was introduced between pilgrim rollers, see, for example, NSR 91 212. Various known embodiments of damping this energy are also described in the magazine "Stohl und Eisen, 1933," pages 433, 434 and 435. These the first energy absorbing attempts have not been satisfactory, mainly because there were strong for ^thee ZOV ^o n ^y vtecovací stohce and docMzelo к high failure rate.

The rolling stands are stressed mainly during the pilgrim step. In the long-term operation of introducing the billet between pilgrim rollers, the front face of the hollow billet is considerably cooled. This cooled rolled material has an increased resistance to deformation and puts heavy strain on the rolling mills, pilgrim rolls and pilgrim mandrels.

In order to keep the cooling of the rolled material as low as possible, as a rule the cooling water for the caliber of the pilgrim roll, which also cools the hollow shaft, is shut down between pilgrim rollers during the blanking operation.

Missing cooling calibres pilger ^Al CE has a ^hole at the side ^hé n ^{a l} e s ^d e ^{to the} substantial increase ^EM te Lot ^{p y p} will cast ou ^{t eh} ^ nothing ^to the cylinder. If it starts. With the beginning of introduction into the caliber of the pilgrim cylinder, the cooling water is again supplied, heavily heated roller surfaces become cloudy and cracks are formed. The cracks cause the formation of fingerprints on the surface of the tube and limits the use ^to poutrnc ACTIVE ^Al c ^s. H ^{l BSI} tohliny ^{characterized} by ^D U is often considerable paring off of the pilger rolls for further use.

^Hive OHA vynteezu with ^p oftv ^A in the measurement ^{of yl} in the device, which may be truncated to the loading process pilger rolls without causing damage to the rolling mill, rolls or mandrel.

This object is solved by a device for blocking axial displacement of the hollow billet during its ZAVA en ^{d s d} o ^{p p} outnic ^Ké stohce ccording to the invention, which 'is characterized in that it is provided with baffle plates arranged on the output side of a pilger mill, and the face .narážky in the operative position in the gap between obtesti Pilgrim in LCI PrOH ^plated face of a hollow billet, wherein the cue is provided with a recess for a pilger mill mandrel and is disposed pivotably thereon.

The stop can be suspended on a pivot device provided with at least one working cylinder.

The stop can be provided on the front side with a recess corresponding to the smoothing caliber of the pilgrim rollers, or it can be inserted into a holder mounted slidably in the guide rails. The stopper and holder can be fitted with replaceable spacers.

Apparatus of the invention, a considerable shortening of the period of introduction of the rolling stock into ^the ACTIVE pilgrims VTEC ^resulting after a ^d state ^{of men,} MU Nam ^Aha Te ^š echoes. arrange.

Shortening the operation of introducing the rolled ^and bound poutmc ^{Ké Al} tion with ^{p whose} weighing of the ^fact 'that the device secures the hollow block at the stage of introduction of the rolling stock on the mandrel pilger rolling, so that between the rolls. and ^p dteým rova ^LK em ^to ignite and ^favorable conditions for its grip. The direction of force action is directed to ^{D characterized} in that ^the Proval vhoto ^ at the j th PRVT ^to work with ^the ro yc pilgrims ^{to Al h} c ^{s d} oc ^H and ^I in ^the relatively ^LKE ztvarováte him. ^Those m DOS ^and HNE reeve and firmly ^é navtecov ^and that DUT ^eh a block pilger mandrel, and the relatively large back-reflection of the hollow of the rolled backward movement causes the helical movement of the hollow Provan from ^L e ^p Shui ^I C ^I is ^H by zaváté (tête between the pilgrim war.

^R ychlým zaMjetem ^W Screw poh ^h o ^y bu avoiding creating disparities resulting strong jump cylinders.

By shortening the process of introducing the strudel between pilgrim rollers, the total rolling time is shortened, leading to an increase in pilgrimage performance.

The hollow block is also cooled less generally during the reduced rolling time, which in addition means less stress on the rolling mill.

^The average ^SSI pulsation y ^{Al s} mined material by allowing for greater production of thin-walled tubes of lengths of rolled and positively influences the pilger rolling out heads.

With the device according to the invention, it is guaranteed to prevent flooding due to excessive displacement of the hollow block or slipping of the hollow block from the pillow mandrel when introducing the lining between the pilger rolls. This avoids exceeding the permissible cross-sections of the hollow-roll formation at one roller revolution and the permissible rolling. forces and torques. This prevents the pilgrim rollers and drive spindles and other drive components of the pilgrim rolling mill equipment from breaking.

Further, the controlled driving the hollow billet to a position most favorable for the open uc ^h m ^ ^í kill it ^Ké ^ it to face the side of the hollow 'wiping unit during a plurality of consecutive revolutions of the rolls of edge polishing portion of the pilger rolls. On the part of ^the fume havens Tastic namely while boiling n ^g ^ ^{k y} materia ^é ter at da ^LSI mV ^and lcovacím procedure causing scratches on the tubes.

The device according to the invention facilitates the work of the operator who must perform laborious operation zaváťtaní ^d ut it ^s pedvateu pilger rolls with great care and skill.

The drawings show schematically a possible embodiment of the device according to the invention. ^N and above ^to RESEC ^h ing to FIG. 1 to ma. začátau operation ZAV ^and children ^d in ^teh of the rolled pilger rolling, Fig. 2 equ it in the end position for insertion into the pilger rolls, Fig. 3 in the rest upholstery, FIG. 4 ^of EZ-B of FIG. 1 impinges ^f 5 and section C-D of FIG. 2.

1, 2 and 3 are shown pilgrim rollers 14 and pilgrim mandrel 15 with a pillar stand 10 of rollers 14. On the side of the tubes of the pillar stand of pilger stand 10 of rollers 14, the device according to the invention is fastened by means of a frame 8. The pressure lifting working cylinders 5 and the cylinders 7, which are intended to move the stopper holder 2 into the working position, are connected by means of joints. The holder 2 holds the cues 1 cue 1 and is movably supported in the guide rails 2 cues third holder 1 through a rotary joint 4 connected to the pressure lifting work ^and the cylinder ⁵ m and ^p dip rotatably ^No n ^e it ktaubu 6 ^SV lcem Ί. The rollers ⁵ and ⁷ are ^d n The advantage ^of sliding protected by a thermal shield 13 against heat.

As can be seen from FIG. 4, the guide rails 3 are each provided with a boundary edge 9. The stopper 1 and / or the stopper holder 2 are further provided with replaceable spacer bars 12. The guide rails 3 are adjustable in height.

Fig. 5 is a cross-sectional side view C-D of Fig. 4.

It goes without saying ^{that which} just an ^{E solution} with only one cylinder forming part of the motion.

Claims (5)

OBJECT OF THE INVENTION An apparatus for blocking the axial displacement of a hollow billet during its introduction into a pilger mill, characterized in that it is provided with a stop (1) disposed on the outlet side of the pilger stand (10) and the end face of the stop (1) being in the working position pilger gap between the cylinder (14) against the face of the hollow billet (16), the stop (1) is provided with a recess for the pin (15) of a pilger mill (10) and is pilgrims mill ⁽¹⁰⁾ arranged above ^{ky d} ána outside 2. Device according to claim 1, characterized in that the born ^and Z ^to A ⁽¹⁾ is suspended above ^the y NEM device includes at least one ^p racovmm cylinder ^{(5). 3.} Anzen ^p ccording ^b ODU 1 and 2, characterized in that the stop (1) on its front side a recess (11) corresponding ^{di hl} and sweetening ^for Alibre poutnta ^to ACTIVE ^Al c ^{U (14).} Device according to one of Claims 1 to 3, characterized in that the stop (1) is inserted into a holder (2) displaceably mounted in the guide rails (3). ⁵ . ^From egulations ^p o ^{d b} ouu Ie 1 ^{and 4, characterized} in značuj ^s c ^s tm is that impinges ^ZK and ⁽¹⁾ and / No r ^{d b} of ^{the pupil} (2) are provided with replaceable spacer strips (12).