WO2017063949A1

WO2017063949A1 - Insertion piece for supporting a roll

Info

Publication number: WO2017063949A1
Application number: PCT/EP2016/074006
Authority: WO
Inventors: Daniel Knie; Johannes Alken
Original assignee: Sms Group Gmbh
Priority date: 2015-10-13
Filing date: 2016-10-07
Publication date: 2017-04-20
Also published as: DE102015219753A1

Abstract

The invention relates to an insertion piece for supporting a roll, in particular a back-up roll in a roll stand. The insertion piece 100 has a receiving space, preferably comprising a bearing bush 150, for rotatably supporting a roll neck 210 of a roll in a roll stand. An annular lubrication gap 220 for coolant and/or lubricant is formed between the receiving space and the roll neck. A supply channel for the coolant and/or lubricant is provided in the interior of the receiving space 110, in addition to a discharge device 130 for discharging said coolant and/or lubricant from the receiving space. In order to further increase the permissible operating limits, for example the permissible maximum rotational speeds for an insertion piece, in the embodiment of the insertion piece according to the invention, the supply channel for the coolant and/or lubricant is located within an angle at circumference range of α of 90° < α < 270° relative to a radial half-plane of the insertion piece. At the same time, the discharge device is located, starting from the half-plane Y, in front of the supply channel, when seen in the rotational direction of the roll, within an angle at circumference range β of 0° < β < 270° in the lubrication gap 220.

Description

Chock for storing a roller

The invention relates to a chock for rotatably supporting a roller, in particular a support roller in a roll stand.

Such chocks are known in the art, for. B. from German Patent Application DE 10 2006 016 714 A1 in principle known. The local chock, also called bearing housing, has a cylindrical receiving space for receiving and rotatable mounting of a roll neck of a roller to be supported. Between the chock and the roll neck an annular lubrication gap for coolant and / or lubricant is formed. The chock has an inlet channel for the coolant and / or lubricant in the receiving space. Furthermore, the chock has a Abieiteinrichtung for deriving the coolant and / or lubricant from the receiving space and a Abieiteinrichtung associated drain channel for receiving and discharging the Abieiteinrichtung derived cooling and / or lubricant.

Although the Abieiteinrichtungen in the known chock are on the ball side of the chock, but arranged outside the lubrication gap. The Abieiteinrichtungen in the known chock are also deliberately designed so that they do not touch the surface of the roll neck; Rather, a planned gap or distance remains between the Abieiteinrichtungen and the pin surface to allow a certain amount of coolant and / or lubricant to pass the Abieiteinrichtungen over.

A portion of the supplied via the inlet channel coolant and / or lubricant remains in known chocks typically for a few turns in the oil film of the bearing, ie in the formed between chock and roll neck lubrication gap to absorb heat there and then dissipate. However, the adhering to the warm surface of the roll neck or the roll neck sleeve coolant and / or lubricant isolated, however the roll neck or the pin bushing and thus prevents optimal heat dissipation. This also applies in particular to the chock disclosed in DE 10 2006 016 714 A1. This disadvantage of insufficient heat removal has an effect, in particular in the rear, high-speed stands of a finishing train, because these stands tend due to the high speeds of their rollers to a high temperature development. If the temperature in a bearing becomes too high, the viscosity of the coolant and / or lubricant decreases excessively and the bearing surfaces come into contact. The result is a bearing damage. In order to avoid such bearing damage, therefore, clear permissible operating limits, in particular maximum speeds, are specified for traditional chocks. However, these operating limits or speed limits are too low for some applications.

Based on this prior art, the present invention seeks to further develop a known chock for storing a roll in a rolling mill to the effect that the permissible operating limits, such as the maximum permissible speeds, can be further increased.

This object is solved by the subject matter of patent claim 1. This is characterized in that the inlet channel for the coolant and / or lubricant in a circumferential angle range α of + 90 ° <α <+ 270 ° is arranged, based on a radial half-plane through the chock, in which an external force as Reactio the rolling force acts on the roll during the rolling operation; and that the Abieiteinrichtung, starting from the half-plane, seen in the direction of rotation of the roller, is arranged in front of the inlet channel and in a circumferential angular range ß of 0 ° <ß <270 ° in the lubricating gap. The half-plane according to the invention extends as a half sectional plane starting from the central longitudinal axis of the example cylindrical Receiving space of the chock radially in the direction of the rolling force in the load case. The half-plane does not extend in the radial direction against the direction of the rolling force. It is made the simplified assumption that the longitudinal axis of the receiving space and the longitudinal axis of the roller, which acts in the load case, the rolling force coincide. That is, it is suggested in the alternative that the rolling force - contrary to reality - attacks the longitudinal axis of the receiving space. The actual in the load case radial offset between the longitudinal axis of the roller as a line of attack of the rolling force and the longitudinal axis of the receiving space is considered negligible and therefore ignored.

The term lubrication gap refers to the area of the load-bearing coolant or lubricant film in the receiving space. The chock and the roll neck are cooled by the fresh coolant and / or lubricant supplied into the receiving space. After its supply through the inlet channel, the coolant and / or lubricant is sucked by the pumping action in the interior of the receiving space in the annular lubricating gap and fed to the drainage channel. The fresh coolant and / or lubricant is also heat carrier, which transports the heat energy from the warehouse, so it cools.

In the chock according to the invention, the inlet channel for the coolant and / or lubricant in a circumferential angle range α of + 90 ° <α <+ 270 ° relative to the radial half-plane through the chock is arranged. D. h., The inlet channel is positioned in the chock in an area where the gap height of the lubrication gap in the load case in the direction of rotation of the roller is increasingly larger and thus the bearing sucks fresh coolant and / or lubricant. Due to the inventive positioning of the discharge device in the direction of rotation of the roller seen in front of the inlet channel, is advantageously achieved that old or warmed up coolant and / or lubricant, after only just 1 Turn of the roller has gone through, is already transported away again through the drainage channel. This has the advantage that immediately fresh cool coolant and / or lubricant passes through the inlet channel in the lubrication gap and on the roll neck and can absorb heat there. The result is advantageously a significantly improved cooling effect in comparison to the prior art, where the coolant or lubricant circulates several times before it is discharged. Due to the improved heat dissipation, in particular, the permissible operating limits, for example, the maximum permissible speeds for the roller in the chock, can be significantly increased.

According to a first embodiment, the Abieiteinrichtung is designed as stripping means for scraping the coolant and / or lubricant from the surface of the roll neck. No gap is then provided between the stripping device and the surface of the roll neck; Rather, the wiper device is in direct contact with the surface of the roll neck to scrape the coolant or lubricant adhering to the surface of the roll neck or pin bushing there. The supplied fresh coolant and / or lubricant can therefore advantageously come into direct contact with the surface of the roll neck or the journal book and record there very effectively the heat. Due to the design of the Abieiteinrichtung as stripping the cooling effect is further improved significantly, whereby the permissible operating limits are further increased. Advantageously, the stripping device is associated with a pressing device in order to press the stripping device against the surface of the roll neck with a predetermined pressing force. In this way it is advantageously ensured that the wiper sealingly abuts the surface of the roll neck and that in fact also adhering to the surface of the neck sleeve coolant and / or lubricant can be scraped off there by means of the stripping. According to a further embodiment, the stripping device is arranged in the chock in the lubrication gap parallel to the longitudinal axis of the receiving space. It preferably extends over its entire length and more preferably over the entire length of the roller mounted in the receiving space.

Optionally, the chock on a bearing bush, which is arranged rotationally fixed in the chock. The inlet channel for the coolant and / or lubricant must then penetrate the bearing bush to allow a supply of coolant and / or lubricant in the receiving space. The stripping device is then arranged on the inside of the bearing bush in order to be able to come into direct contact with the surface of the roll neck. The acute angle γ between the position of the stripping device and the inlet channel on the circumference of the chock is as small as possible, preferably <45 °, for the purposes of the present invention.

The chock according to the invention is particularly well suited for the storage of back-up rolls in rolling stands for rolling metallic rolling stock, because in these cases the occurring (rolling) forces are particularly great. The inventive design of the chock, which can be retrofitted even with existing chocks, the chock is advantageously designed for higher rolling forces, especially at higher speeds. The invention is not limited to this application; In principle, intermediate or work rolls can be stored in the chock according to the invention.

Further advantageous embodiments of the chock are the subject of the dependent claims. The description is accompanied by five figures, wherein a cross section through an inventively designed chock for an upper roller, in particular support roller in a roll stand for opposite directions of rotation;

a cross section through an inventively designed chock for a lower roller, in particular support roller in a roll stand for opposite directions of rotation; and

show a longitudinal section through a chock.

The invention will now be described in detail in the form of embodiments with reference to said figures. In all figures, the same technical elements are designated by the same reference numerals.

Figures 1 and 2 show cross-sections through the chocks 100 and roll neck 210 on the side of the roll bale and on the bale-distant side for upper rolls in a rolling stand, that is for rolls above the rolling stock line.

1 shows a cross section through a chock 100 according to the invention with a receiving space 110 for receiving and pivoting a roll neck 210 of an upper roll, in particular an upper backing roll in a roll stand. The receiving space 1 10 is typically clamped or limited by a bearing bush 150, which is arranged rotatably as wearing parts in the chock 100. In the installed state, an annular lubricating gap 220 is formed between the roll neck 210 and the bearing bush 150. This lubrication gap 220 is via an inlet channel 120 with coolant and / or lubricant, for. As oil fed. Relative to the half-plane Y is located the inlet channel 120 seen in the embodiment shown in Figure 1 at a 90 ° position in the direction of rotation of the roller. The location of the half-plane Y is defined earlier in the general part of the description. In the general case, the supply channel for the coolant and / or lubricant can be positioned in an angular range of 90 ° <α <270 ° with respect to the half-plane Y. To the receiving space 1 10 toward the opening of the inlet channel through a recess 122, also called oil pocket, be extended in the wall of the chock or the bearing bush. In addition to the inlet channel 120 is located on the inner wall of the receiving space 1 10 or optionally on the inside of the bearing bush 150 in the lubricating gap 228 Abieiteinrichtung 130. The Abieiteinrichtung 130 extends parallel to the longitudinal axis L of the receiving space 1 10 and preferably over the entire Length of the lubrication gap 220.

The Abieiteinrichtung 130 projects radially into the lubrication gap 220. In a first embodiment, its radial length is so short that a gap remains between it and the surface of the roll neck. Then, coolant and / or lubricant sticks to the surface of the roll neck and the cooling effect is sub-optimal. In an alternative second embodiment, its radial length reaches the surface of the roll neck to scrape off the coolant and / or lubricant therefrom. Then, the new / fresh coolant or lubricant comes into direct contact with the surface of the roll neck or the pin bush, whereby the cooling effect is improved. In the second embodiment, the Abieiteinrichtung is also referred to as stripping.

Optionally, the stripping device 130 can be pressed sealingly against the surface of the roll neck 210 rotating in the receiving space 110 by means of a pressing device 160 in the radial direction. It is important that the stripping device 130 - seen in the direction of rotation of the roller - always before the Supply channel 120 is arranged in the chock or in the bearing bush and as close as possible, ie with the smallest possible acute angle γ with 0 <γ <50 °, preferably 10 ° <γ <45th The angle γ is determined from the center or the center line of the inlet channel or the coolant or lubricant pocket up to the middle of Abieiteinrichtung, seen in the circumferential direction.

Viewed in the direction of rotation of the roller 200, a discharge channel 140 is preferably arranged immediately in front of the stripping device 130 for discharging coolant and / or lubricant which accumulates in the direction of rotation R of the roller in front of the stripping device 140.

According to the present invention, the Abieiteinrichtung 130, starting from the half-plane Y, are arranged in an angular range of 0 ° <ß <270 ° in the direction of rotation of the roller.

Figure 2 shows a cross section through the opposite pin of the roller and the associated chock of Figure 1; In other words: FIG. 2 shows a view of the opposite end face of the chock-roll arrangement in contrast to FIG. 1.

The bearing according to the figures 1 and 2 works in the rolling operation as follows:

Coolant and / or lubricant is fed into the receiving space 110 via the inlet channel 120; the coolant and / or lubricant is then distributed throughout the lubrication gap 220 between the wall of the bearing bush 150 and the roll neck 210.

In the case of load, an external force F and, as a reaction, a rolling force W acts on the roll neck or roll stand. Due to the force effect, there is a radial displacement of the roll neck in the receiving space 1 10, whereby the lubricating gap 220 or the film of coolant and / or lubricant therein is formed asymmetrically, as shown in FIG. For the sake of simplicity, however, it is assumed that both the external force F as well as the rolling force W act only in the half-plane Y and compensate for the amount.

The oil in the annular lubrication gap is then scraped off the surface of the roll neck by means of the discharge device 130 after undergoing less than one revolution of the roll, and discharged from the receiving space 110 into a drain channel 140. Fresh / new coolant and / or lubricant then repeatedly passes via the inlet channel 120 to the previously scraped-off surface of the roll neck, whereby a very good cooling of the roll neck is achieved. Figures 3 and 4 show cross-sections through the chocks 100 and roll neck 210 on the side of the roll bale and on the bale-distant side for lower rolls in a roll stand, ie for rolls below the rolling stock line. For the figures 3 and 4 is an analogous description as for the figures 1 and 2; This also applies in particular to the definition of the angular ranges: angle α for the angular range of the inlet channel and angle β for the region of positioning of the stripping device 130. FIG. 5 shows a longitudinal section through a chock 100 with a bearing bush 150 and a roll neck rotatably mounted in the bearing bush 210 of a roller 200. Between the bushing 150 and the roll neck 210, the annular lubricating gap 220 is formed for the coolant and lubricant. In the lubricating gap of the coolant or lubricant film is load-bearing. The Abieiteinrichtung invention 130 or stripping, not shown in Fig. 5, is disposed in the lubricating gap and projects radially into it. The Width B of the lubrication gap is determined by the shortest width of closely spaced radially opposite portions of the chock and the bushing and the pin bushing, if any. In contrast, the Abieiteinrichtung in the introductory prior art outside the width B of the lubricating gap 220 at the height of the position X between bales of the roller 200 and the chock 100 is arranged. This area is also referred to as a cooling and / or lubricant collecting space; because there accumulates the side emerging from the lubrication gap cooling and / or lubricant. The coolant and / or lubricant is no longer load-bearing there.

LIST OF REFERENCE NUMBERS

chock

accommodation space

inlet channel

recess

Abieiteinrichtung

drain channel

bearing bush

pressing device

roller

roll neck

annular lubrication gap

direction of rotation

longitudinal axis

half-plane

Angle range for inlet channel

Angular range for stripping device

acute angle between wiper and inlet channel external force

rolling force

Width of the lubrication gap

Claims

claims:

1 . A chock (100) for rotatably supporting a roll in a rolling stand, comprising:

a receiving space (1 10) for receiving and rotatably supporting a roll neck (210) of the roll, wherein between the roll neck and the inner wall of the receiving space, an annular lubricating gap for cooling and / or lubricant is formed;

an inlet channel (120) for the coolant and / or lubricant in the

Recording room (1 10),

a discharge device (130) for the coolant and / or lubricant from the receiving space; and

a drain channel (140) for receiving and discharging the of the

Deriving device derived coolant and / or lubricant;

characterized,

the inlet channel (120) for the coolant and / or lubricant is arranged in a circumferential angle range α of + 90 ° <α <+ 270 ° relative to a radial half plane (Y) through the chock (100), in which an outer Force acts as a reaction of the rolling force to the roll during the rolling operation; and

that the discharge device, starting from the half-plane (Y), in

Direction of rotation (R) of the roller seen in front of the inlet channel and in a circumferential angular range ß of 0 ° <ß <270 ° in the lubrication gap (220) is arranged.

2. Chock according to claim 1,

characterized,

in that the discharge device (130) is designed as a stripping device for scraping off the coolant and / or lubricant from the surface of the Roll neck.

3. chock (100) according to claim 2,

marked by

a pressing device (160) for sealingly pressing the

Scraper (130) to the surface of the roll neck.

4. chock (100) according to any one of the preceding claims,

characterized,

that the Abieiteinrichtung (130) in the chock (100) is arranged so that they are parallel to the longitudinal axis (L) of the

Receiving space (1 10) and preferably over the entire length of the lubricating gap extends.

5. chock (100) according to one of the preceding claims,

characterized,

that in the chock a bearing bush (150) is arranged rotationally fixed for limiting the receiving space (1 10);

that the supply channel (120) for the coolant and / or lubricant penetrates the bearing bush (150); and

that the Abieiteinrichtung (130) on the inside of the bearing bush (150) is arranged.

6. chock (100) according to any one of the preceding claims,

characterized,

that on the inside of the receiving space bounding wall of the chock or the bearing bush, in the region of the mouth of the inlet, a recess (122) is designed as a cooling and / or lubricant pocket.