RU2376087C1 - Cold-rolling mill for pipes - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention is used in cold-pipes rolling mill with butt loading of blanks. Cold-pipes rolling mill contains rolling mill with driven, distributive feeder with feed screw, connected to guides with working mill, chuck of blank with nuts, interacting to feed screw, front and back support holders, operating for maintenance of feed screw, draw bar and blank. Front support holders are rigidly connected to telescopic rods, in pairs with back support holders. At front support holder it is installed sensor, sending signal about passing of front end of blank, and on guidelines there are located holders of this sensor. Before front support holder it is installed blank clamp.

EFFECT: invention will provide improvement of received pipes and productivity grow of mill ensured by increasing of reliability of operation of mill automation at tracing of joint of tubular billet during recharge of mill, and also at passing of joint in deformation site, that provides implementation of rolling at optimal technological modes.

2 dwg

Description

The invention relates to the field of metal forming, and more specifically to a cold rolling mill pipe with end loading of billets.

Known cold pipe mill KPV 25 BMP (KPW 25 VMR) f. Mannesmann-Demag, see "Design, repair and maintenance of cold pipe mills." Kondratov L.A., Chechulin Yu.B., Bogdanov N.T., Makarkin B.C., Metallurgy Institute, 1994, pp. 118-125.

The known mill contains a working stand with a movable power base, a drive mechanism with a crankshaft, a feed-distributing mechanism with feed screws, including a feed mechanism, turning and clamping the mandrel bar, a workpiece cartridge with nuts interacting with the feed screws, front lunches rigidly connected by rods , pairwise with backrests. Lunettes support the feed screw, mandrel bar and workpiece. The distribution and feeding mechanism is connected by guides to the working stand. The mill has an end system for loading workpieces with a stand stand for reloading.

The disadvantage of this mill is the instability of the feed rate due to the presence of a large number of kinematic connections during transmission of rotation from the main drive to the distribution-feeding mechanism, which negatively affects the quality of rolled pipes.

Of the known closest in technical essence is a cold rolling mill with end loading of the workpiece described in US patent No. 3659446, CL. 72-14, claimed 10.21.70, publ. 05/02/72

This mill contains a working stand, a drive, a distribution and feeding mechanism with feed screws, connected by guides to the working stand, a workpiece cartridge with nuts interacting with feed screws, front lunettes, rigidly connected by rods in pairs with back lunettes. The distribution and feeding mechanism includes a mechanism for feeding, turning and clamping the mandrel bar. The mill is equipped with a tool for measuring the length of rolled billets.

A disadvantage of the known design of the cold rolling mill is the insufficient quality of the resulting pipes due to the inability to trace the passage of the junction of the workpieces in the deformation zone to create reduced rolling conditions. This is due to the fact that the mill stops for recharging at the moment when the workpiece cartridge has passed the distance equal to the length of the next workpiece, and this value is variable.

This negatively affects the quality of rolled billets and productivity, as rolling is carried out at reduced deformation modes.

The objective of the present invention is to create a cold rolling pipe mill, which allows to improve the quality of the pipes and increase productivity by tracking the passage of the junction of the workpieces in the deformation zone to create optimal modes of rolling workpieces of any length.

The task is achieved in that the cold pipe rolling mill, comprising a working stand with a drive, a distribution and feeding mechanism with feed screws, connected by guides to the working stand, a workpiece chuck with nuts interacting with feed screws, front lunettes, rigidly connected by telescopic rods in pairs with backrests, according to the invention, is equipped with a sensor mounted on the first frontrest, giving a signal about the passage of the front end of the workpiece, located on the guides wrinkled sensor and a workpiece clamp installed in front of the front rest.

Such a constructive implementation of the cold pipe rolling mill will allow you to monitor the junction of the pipe billets, its passage in the deformation zone and carry out rolling under optimal conditions, which will improve the quality of the pipes and increase the productivity of the mill.

This is achieved by installing the sensor on the first front rest, which gives a signal to the control system when the front end of the workpiece appears in the sensitivity zone (response), moved by the workpiece cartridge forward, which allows the workpiece cartridge to stop, and therefore the workpiece in a position that provides the minimum possible clearance between the ends of the previous and loaded workpieces. The installation of clamps on the guides will prevent spontaneous movement of the lunettes when changing sliding conditions in telescopic rods, and therefore the sensor installed on the first lunette, which stabilizes the rolling process.

The clip installed in front of the first rest allows eliminating spontaneous uncontrolled movement of short workpieces back when moving the workpiece cartridge and rests to their original position, which can lead to false alarms of the sensor, and thereby ensure high-quality rolling of short workpieces.

To explain the invention, a specific embodiment of the invention is provided below with reference to the accompanying drawings, in which:

figure 1 shows a cold pipe rolling mill (diagram, start of rolling, dash-dotted line shows the lunettes, the workpiece cartridge and the workpiece in the frontmost position);

figure 2 is the same (the moment of passage of the front end of the sensor blank).

The cold tube rolling mill comprises a working stand 1 with a drive, a distribution and feeding mechanism 2 with feed screws 3, connected by guides 4 to the working stand 1, a workpiece cartridge 5 with nuts 6 interacting with feed screws 3, and front 7 and rear 8 lunettes, serving to support the feed screws, mandrel bar and workpiece. The front 7 lunettes are rigidly connected by rods 9 in pairs with the rear 8 lunettes. Rods 9, connecting pairs of lunettes, are installed one in the other with the possibility of telescopic extension and rapprochement.

A sensor 10 is installed on the front 7 backrest, giving a signal about the passage of the front end of the workpiece, and on the guides 4 there are latches 11 of this sensor. In front of the front 7 backrest, a workpiece clamp 12 is installed. The rests 7, 8 and the workpiece cartridge 5 easily move along the guides 4. When changing the sliding conditions in the telescopic rods 9, the lunettes can be moved spontaneously without contact with the workpiece cartridge, which can lead to malfunctions.

To eliminate this phenomenon, clamps 11 are used, which fix the last back 8 lunettes, and therefore the first front 7 lunettes rigidly connected to it by a thrust 9, with a sensor 10 installed on it, in a strictly defined position until the signal picks up by the sensor 10 about the passage of the front end of the loaded blanks. The design of the clamps can be different (spring, hydraulic, pneumatic and other), but providing the possibility of unimpeded movement of the cartridge 5 of the workpiece in the operating mode. To feed the blanks from the loading table 13 on the rolling axis is the pusher 14.

The mill works as follows.

The pusher 14 from the loading table 13 moves the workpiece 15 onto the rolling axis, placing it in front of the workpiece cartridge 5. After that, the pusher 14 returns to its original position, and the workpiece cartridge 5 accelerates by moving the loaded workpiece into the working stand. Then the workpiece cartridge comes back. The movement of the workpiece cartridge is due to the interaction of the nuts 6 with the feed screws 3 of the distribution and feeding mechanism 2. When moving the workpiece cartridge 5 interacts with the lunettes 7 located in front of the workpiece cartridge and with the lunettes 8 located behind it, arranging them evenly.

Then the pusher 14 delivers the next workpiece 16 to the rolling axis, and the workpiece cartridge accelerates the loaded workpiece to the previous workpiece 15. The sensor 10, located on the front 7 rest, gives a signal about the passage of the front end of the workpiece, which allows you to stop the workpiece cartridge, and therefore the workpiece in a position that provides the smallest possible gap l _min between the ends of the previous 15 and downloadable 16 workpieces.

Next, the workpiece cartridge 5 switches to the working feed mode, that is, the workpiece is fed in portions synchronously to the movement of the working stand 1, which deforms the workpiece.

When reloading the mill, the short workpiece, due to its length, does not reach the working stand. She lies freely in the lunettes. When moving the workpiece cartridge into its initial position, and therefore the lunettes, it is possible to move the workpiece along with the lunettes, which will lead to a false response of the sensor 10 and malfunctions of the mill. To exclude the movement of the workpiece, a clip 12 is installed in front of the first rest, which secures the workpiece.

The proposed cold pipe rolling mill in comparison with the known ones can improve the quality of the pipes obtained and increase the productivity of the mill by tracking the junction of the pipe billets in the deformation zone and carry out rolling under optimal conditions of billets of any length.

Claims (1)

A cold tube rolling mill comprising a working stand with a drive, a distribution and feeding mechanism with feed screws connected by guides to the working stand, a workpiece cartridge with nuts interacting with feed screws, front lunettes rigidly connected by telescopic rods in pairs with rear lunettes, characterized in that it is equipped with a signal sensor about the passage of the front end of the workpiece with clamps located on the guides and a workpiece clamp installed before lunette him.

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