RU2292971C1 - Cartridge for blank of tube cold rolling mill - Google Patents

Abstract

FIELD: tube rolling production, in particular, cold rolling of tubes.

SUBSTANCE: cartridge has movable casing and spindle fixed within casing on roller bearing and equipped with spring-loaded cam stops. Cartridge is provided with additional non-rotating clamp with screw drive secured on casing at side opposite to spring-loaded cam stops, in axially aligned relation with respect to spindle.

EFFECT: increased efficiency of tube cold rolling mill owing to reduced time for carrying out of auxiliary operations.

2 dwg, 1 ex

Description

The invention relates to pipe rolling production, in particular to the design of cartridges for supplying tube blanks to the rolling zone in cold pipe rolling mills.

Known cartridge billet mill for cold rolling pipes with end loading (see AS USSR No. 162489, CL. 21 B 21/06, 1962), containing a stationary housing and mounted on rolling bearings movable rotating spindle with cam clamp.

The disadvantage of this cartridge is that the workpiece is gripped for the outer diameter, so when the axial forces of rolling increase, the workpiece slips in the cams. This leads to a non-uniformity of the flow rate and, as a consequence of this, a decrease in the quality of rolled pipes.

Of the known designs of blank cartridges, the closest in technical essence is the cartridge described in A.S. USSR No. 565730, class B 21 B 21/06, 1977.

The cartridge contains a housing movable from the drive and a spindle with spring-loaded cam stops located on it, which provide gripping and moving the workpiece during rolling. A disadvantage of the known design is that the spring-loaded stops cannot be used to move the workpiece in the opposite direction during commissioning and repairs, which increases the time for servicing the mill and leads to a decrease in production volumes.

The objective of the invention is to increase the productivity of the mill by reducing the time to perform auxiliary operations by mechanizing them.

The task is achieved in that the workpiece cartridge, comprising a movable housing and a spindle with spring-loaded cam stops located in it on rolling bearings, according to the invention, is equipped with an additional non-rotating clamp with a screw drive mounted on the side opposite to the spindle from the spring-loaded cam stops.

To explain the invention, a specific embodiment of the invention is given below with reference to the accompanying drawings, wherein

figure 1 shows the cartridge blanks, a longitudinal section;

figure 2 is the same, a section along aa in figure 1.

The workpiece blank of the cold rolling mill consists of a housing 1, a spindle 2 on bearings 3, 4, 5 with cam stops 6 and springs 7, a screw pair 8 of the drive for moving the chuck, clamp 9 with guides 10, sliders 11 and 12 with nuts 13 and 14 , screw 15 and removable liners 16 and 17. In the slider 11, a nut 13 with a left thread is installed, in the slider 12 a nut 14 with a right thread is installed. The screw portions 15 interacting with the nuts 13 and 14 have a corresponding cutting direction.

The cartridge works as follows.

In the initial position, the sliders 11 and 12 are installed using the screw 15 so that the inserts 16 and 17 do not interfere with the movement of the workpiece through the spindle 2. During operation of the mill, the workpiece cartridge moves from the screw pair 8. In this case, the spring-loaded cam stops 6 abut against the end of the workpiece and move it in the direction of the working stand.

In the process of setting up the mill during the transition from one size of the workpiece to another, the last workpiece must be removed from the mill by moving it in the opposite direction. To this end, with the help of a screw 15 and nuts 13 and 14, the sliders 11 and 12 are brought together until the workpiece is firmly held by the inserts 16 and 17. By screw pair 8, the workpiece cartridge moves in the necessary direction. Similarly to the workpiece in the process of setting up the mill, the mandrel rod is moved, as well as the workpiece passing through the spindle 2 of the workpiece cartridge.

Moving the workpiece and the mandrel bar using a screw pair 8 of the drive of the workpiece cartridge (instead of manually installing and removing it) allows you to mechanize a time-consuming operation and reduce setup time, which improves the productivity of the cold pipe rolling mill.

Claims (1)

A workpiece chuck of a cold rolling mill, comprising a movable housing and a spindle with spring-loaded cam stops located on it on rolling bearings, characterized in that it is equipped with an additional non-rotating clamp with a screw drive mounted on the side of the side opposite to the spring-loaded cam stops, coaxial with the spindle.

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