SU1191131A1 - Mandrel device for pilger mill - Google Patents

Description

The invention relates to pipe production and can be used on pilger mills.

The aim of the invention is to facilitate the connection and disconnection of the mandrel with the lock.

The invention consists in creating a mandrel device of a pilgrim mill, including a gate, a mandrel lock having an internal cavity with threaded cutting and a mandrel with a shank having two annular cuttings, counter-directed, one for the threaded cutting of the cavity of the mandrel lock, the other under the slide, having a concave rifled segment.

FIG. 1 shows the device, a general view; in fig. 2 - mating mandrel with mandrel lock; in fig. 3 - separation of the mandrel with mandrel lock; in fig. 4 view A in FIG. 3

The device contains a keyhole lock 1, having a ring 2 with internal threading and a centering sleeve 3, which is mounted on the stem 4 of the feeding device 5, a mandrel 6, having a working part 7, a shank 8, on which two rings with threading 9 and 10 are made and centering a cone 11, and a gate 12 with a concave rifled segment 13.

The operation of the device when pairing the mandrel with mandrel lock is illustrated in FIG. 2. After installing the mandrel 6, charged into the sleeve, on the lifting table, the feeding device 5 begins to move from the initial position to the working stand. When this mandrel lock 1, mounted on the rod 4, slides over the shank of the mandrel and due to the presence of the centering sleeve 3 and the cone 11, a preliminary connection of the mandrel with the lock occurs. The lifting table is lowered and the feeding device and the mandrel with the sleeve continue to move in the direction of the work rolls until the metal is caught by the rolls. Full mating of the lock with the mandrel 6 will occur at the first working feed of the stem of the feeder when it is rotated around its axis.

During the rolling process, the stock rotates in one direction at each feed. Due to this, the tension in the lock-mandrel connection is ensured.

Rolling is performed without a residual piligrimage head due to the presence of a shaped section on the mandrel 5. After rolling is completed and the mandrel is removed from the finished pipe, the mandrel and mandrel locking are disconnected (Fig. 3). To do this, during the movement of the feeding device to its original position from the working stand after the passage of the stem 4 with the mandrel lock 1 installed on it above the gate 12 of the entrance groove, the latter rises and enters the connection with its rifled segment 13 with the corresponding threaded ring 10 on the shank of the mandrel.

When the axial movement of the mandrel in a pair of ring-segment occurs moment, forcing the mandrel to rotate. Since the direction of cutting the ring 11 and the gate segment is opposite to the direction of cutting the ring 9 of the mandrel and the ring 2 of the lock, the mandrel, rotating, will come out of the pairing with the lock. The freed mandrel remains on the lifting table and is transferred to the cooling and lubrication for reuse. During the movement of the feeder to its original position and the beginning of the movement in the direction of the working stand in the inlet chute, a new mandrel already loaded into the sleeve has already been installed.

Thus, by automating the operations of joining and disconnecting the mandrel with the feeding machine rod, the auxiliary time of the rolling process is reduced, the productivity of the whole unit with the pilger mill is increased.

As an example of a specific embodiment, we consider the work of the mill when rolling tubes ¢) 245 mm from sleeves 0 385 mm. The working part of the mandrel was 0 234 mm. The diameter of the rings 9 and 10 on the shank of the mandrel was 350 mm. The diameter of the inner threaded ring was 2–290 mm. The rings were made separately and then installed on the shank at a distance of 80 mm from each other. Pairing rings and mandrel carried press fit. The inner ring of the mandrel lock was also made separately, and then fixed in the body of the lock. The ring is fixed against rotation by its spline connection with the lock body, and the centering sleeve secures the ring from axial movement. The direction of cutting on the ring of the lock and the corresponding ring of the mandrel has a direction that coincides with the direction of rotation of the stem of the feeder.

Cutting a segment of the gate of the inlet chute and the corresponding ring on the mandrel has the opposite direction. The profile section, which performs the function of the mandrel ring, provided rolling pipes without a residual piligrimage head. The diameter of the ring on the mandrel should ensure the free exit of the pilgrim rolls when rolling the zone of the residual piligrim head.

Compared with the prototype, the use of the present invention allows to automate the operations of connecting and disconnecting the mandrel with the rod of the feeding apparatus, which reduces the total time of the rolling cycle; roll pipes without a piligrim head due to the presence of a profile section on the mandrel; exclude from the design of the mandrel ring for liner stop.

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Claims (2)

Arbor DEVICE pilger comprising a mandrel lock having an internal cavity with a threaded and mandrel shank having an annular cutting, characterized in that, in order to facilitate connection and disconnection of the mandrel and the lock is provided with a gate valve having a concave grooved segment, the direction of slicing which is opposite to the cutting direction of the cavity of the mandrel lock and, accordingly, the cutting of which is performed additional annular cutting on the shank of the mandrel. FIG. one > 1191131 2