SU541525A1 - Drag mill - Google Patents

Description

(54) THE BARRIERS

FIELD: dragging.

A drawing mill is known, including a fiber holder with a wire, drive and idler, sprockets mounted on the axis with T5p chains and which have carriages with clamping spring-loaded dies and a device for pre-gripping the workpiece. .

The known mill with an increase in the speed of dragging does not ensure reliable interception of blanks. Intercepting the blanks by moving the rollers mounted on the ends of the double-arm levers, the axes of which are connected to the traction chains, and the opposite ends connected to the carriages mounted on the guides, along the copiers complicates the design of the mill.

In order to increase the reliability of the mill, it has been proposed to firmly install profiled cams on the axis of idle sprockets, the tappets of which are rigidly connected to the fiber holder, which is installed in guides parallel to the axis of dragging.

FIG. 1 schematically shows the proposed drawing mill, FIG. 2, section A-A in FIG. 1, in FIG. 3 is a view of B in FIG. one; in fig. 4 - t gova carriage.

The mill includes a movable fiber holder 1 with a wire (not shown in the figures) and rollers 2 mounted in guides 3 parallel to the axis of dragging.

Claims (1)

The springs 4 clamp the fiber holder 1 to the profiled cams 5 rigidly mounted on the shaft 6 of the idler sprockets 7. On the idler sprockets 7, the leading sprockets 8 and the guides 9 there are infinite traction chains 10 to which the rigid carriages 11 and 12 are fixed. the clamping dies 13 with springs 14 embedded in them. In the vicinity of the idler sprockets in the drawing area, a device 15 is placed to pre-grip the workpiece with traction carriages. The cams .e are profiled so that Imene; the radius of the quack at the utter f, corresponding to the stage of interception of the product being withdrawn by means of traction carriages, is determined by the following relationship: V. 5 V. where V is the speed of the fiber holder; V | - the speed of the carriage on the gilding area. The speed of the BOTTLE HOLDER is determined by the formula: Y. , (2) where (Г - Г) is the change of the cam radius at the angle tf, corresponds to interception (in meters); ti is the angular velocity of rotation of the idler of the asterisk (3 rad / s); C - the angle of interception (in rad). The carriage speed is determined by the formula: (3) where Z is the number of teeth of the idler sprocket; i, - step chain in meters. Substituting the values of V and Y, in formula (3), we obtain, after the reduction of r. associated with the distance between the traction carriages and. as follows: p 4. in which Z, i; and E are chosen such that n is an integer. Works mill as follows. Before the start of the dragging, the fiber holder 1 is in the extreme forward position, at which the distance between the dog and the traction carriage 11 located in the pre-grip zone is minimal. The product to be processed is pushed into the fiber for a length sufficient to be gripped by the traction carriage 11, the clamping dies 13 of which are captured by their springs 14. The endless values of 1O are set in motion together with the traction carriages 11 and 12 fixed on them. 13 t of the bend carriage 11 captures the workpiece with the help of the device 15 for preliminary gripping, made, for example, in the form of a spring-loaded stop. With further movement of the traction carriage 11 along the drawing section, the process of drawing the processed product is carried out by this carriage until the final drawing of the processed product does not go into the area of the preloading grip on the drawing section. At the drawing stage, the fiber holder 1 moves from the extreme front to the rearmost position, at which the distance between the fiber and the pre-grip area of the workpiece is maximal. This movement is due to the profile of the cam 5. At the interception stage, the cam radius sharply decreases in accordance with formula (1), and the fiber holder 1 receives a movement in the direction of dragging at a speed not lower than the speed of dragging. In such a movement of the fiber carrier 1, the clamping plates 13 of the beater carriage 11 are released from the dragging force and are opened by their springs 14. The stroke of the blankets is chosen so that when the traction carriages 11 and 12 pass from the straight line drawing segment to the curved section of the sprockets, the workpiece does not prevented this transition. To eliminate seizure of the clamping dies in the body of the pull carriage, the angle of the wedge surface of the body is made greater than the friction angle on this surface. After the traction carriage 11 is released from the workpiece, the clapper begins to move away from the pre-grip zone, whereby the pre-clamped dies 13 of the carriage 12 carry out the final grip of the workpiece and thereby incorporate the traction carriage 12 into the process. Further, the process of continuous interception drawing is repeated. Both at the drawing stage and at the interception stage, the speed of the workpiece is constant, since it is determined by the speed of movement of the chain on the drag wire. DETAILED DESCRIPTION OF THE INVENTION A drawing mill comprising a die with a die, driving and idling, sprockets mounted on an axis with a pull chain on which carriages with clamping spring-loaded cloaks are attached, and a device for pre-gripping the treated products, distinguished by the fact that, in order to increase the mill's reliability in operation and to simplify its design, the OCVI of single sprockets are rigidly fitted with shaped cams, the tappets of which are rigidly connected to the fiber holder, which is installed in guides parallel to the axis of dragging. 1 IG