SU1667975A1 - @@@ positioner for planar stock - Google Patents

Abstract

The invention relates to the field of metallurgy, and more specifically to the auxiliary equipment of rolling shops, and can be used in turning machines used in the stripping of workpieces. The purpose of the invention is to increase productivity due to the continuity of the canting process. After one side of the workpiece has been machined, the cart is set in motion, with the workpieces moving toward the side face of the slab, shifting into a turning edge, where they can be tilted 90 °. When the trolley continues to move, the next billet doctures the previous one by 120-130 °, after which it cans up to 180 ° under its own weight and slides off to the rack. This allows continuity of the canting process. 14 ill., 1 tab.

Description

The invention relates to metallurgy, in particular to the fittings equipment of rolling shops, and can be used in turning machines used in the stripping of workpieces.

The purpose of the invention is to increase productivity due to the continuity of the canting process.

FIG. 1 shows a diagram of the device, a general view; in fig. 2 - scheme of the plate; in fig. 3-14 - sequence of operations of turning the workpiece in various versions of plsvin

The tilter of the workpieces 1 contains a carriage 2 with plitains 3 mounted on the guides 4 of the racks 5 with the possibility of its movement by means of a cable

or chains 6. The slabs 3 are made in the form of a trapezium with corners at the lower base 25-30 °, with a length of the upper base equal to 0.20-0.25 of the height of the working part of the trapezium, and a rectangular notch 7, the larger side of which is from the end the upper base at an angle to it, equal to 110-120 °, and to a depth of 0.50-0.55 of the height of the working part of the trapezium. The height of the trapezoid to the level of the racks has a value equal to 1.2 of the wide edge of the rolled steel, which is due to the need to have space for the distribution of the rolled metal after turning. The optimality of the selected parameters, i.e. the angle interval at the lower base, the length of the upper base of the trapezium and the depth of the notch, as well as the angle

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between the notch and the upper base of the trapezium are determined experimentally on a model of a turning device of blanks with a cross section of 210 x 85 mm x mm. Justification of the selected size is given in the table.

The height h of the working part of the trapezium is equal to the distance from the upper base of the trapezoid to the level of the shelving and is 1.2 times the wide face of the rolled steel. This height may vary depending on the size of the wide face of the flat section preform. For example, for blanks with a cross section of 75 x 150, 100 x 200, 125 x 250 mm, the height of the working part of the trapezium will be 180, 240 and 300 mm, respectively.

With an increase in the angle of elevation of the front side of the trapezoid by more than 30 °, when the blanks are transferred to the upper base, an unfavorable scheme of decomposition of the acting forces F occurs at the point of their contact, at which the moment M creates, which turns the blank from the rising row or rotates the blank to a disturbance of the folding process.

Reducing the angle of elevation of the front side of the trapezoid to less than 25 ° has a positive effect on the stability of the turning process. However, given the ratios of the elements of the working part of the turner, in particular, the height of the trapezium and the depth of the notch, when the angle value decreases, the size of the turner increases, which leads to designs and irrational.

When the angle decreases from the proposed interval for the trapezium's back side, the workpiece slides off the wedge, starting from sections with a large base-to-height ratio. This leads in the process of turning to the imposition of subsequent blanks on the previous ones. As the angle of inclination increases above the designated interval, beginning with sections with a lower base-to-height ratio, the blanks after the turning make a fairly large speed and. sharply braking when descending from the wedge to the rack, under the action of the moment of inertia, perekantyvayutsya another 90 or 180 ° (Fig. 5, 6). In addition, impact contacts result in injury to the surface of the workpieces, which also affects the performance of the installation.

The optimal angles of inclination of the rectangular notch were also determined experimentally. As the angles increase and the rectangular shape is retained, the recesses of the billet are rotated during turning and covered

the subsequent preparation descending into the recess (Fig. 7). The process of turning is broken. When opening the notch angle (increasing the right angle), the workpiece is due to friction,

operating at the places of its contact with the edges of the recess, does not descend to the top of the corner and subsequently slides out of the recess without turning over (Fig. 8). Similar processes occur at

0 decreasing the angle values in the range of 110-120 ° (Fig. 9 and 10).

As for the length of the short edge of the notch, its value is not specified, since it takes certain values

5 as a result of geometric constructions with the proposed relations.

Increasing the depth of excavation beyond the specified limits reduces the length of the slit, which leads to a deterioration of the gathering of the workpiece

0 from the working part of the turner to the rack and, ultimately, to a decrease in productivity (Figs. 11 and 12).

In addition, an increase in the depth of the notch means an increase in the length of its short face and

5, at depths greater than 0.55 h, deterioration and disturbance of the process of rolling of steel occur, beginning with sections with a large base-to-height ratio due to the difficulty in the exit of the workpieces from the excavation (Fig. 11).

Reducing the depth of the notch leads to a decrease in the length of the short face. In this case, the car with a small base to height ratio can only be turned by 90 ° (Fig. 12).

5 The interval of the lengths of the upper base of the trapezium (0.20-0.25 h) was determined from the following conditions: with a decrease in the length of the platform, cases of disturbing the turning-over process were observed due to a sharp turning of the workpiece 90 ° at the top of the trapezium corner and covering it not had time to get out of the excavation of the previous billet.

Obviously, the friction forces acting in the places of contact of the blanks (Figs. 13 and 14) prevent the workpiece from moving under the influence of gravity to a horizontal position. At the same time, the center of gravity of the preform significantly goes over the equilibrium

0 point and when one of the other's blanks is torn apart, it sharply turns over, goes into the recess, catches up with the previous one, which is still slowly moving away from the equilibrium position, and covers it. The process of turning is broken, the productivity of the unit decreases.

An increase in the length of the platform, and, consequently, of the zone of contact of the workpiece with the slabs in the horizontal section, leads to an increase in the forces of friction that counteract its advancement. The preform in the transition zone is reversed, the turning process is disturbed.

Example 1. The tantor is made of two vertical slabs. The slabs are an inconsistent trapezoid with corners at the lower base 25 °, upper base length 0.20 h (h is the working part of the trapezium, equal to the distance from the upper base of the trapezium to the level of the shelves and 1.2 times the size of the wide edge of the trapezium rolled). With a sectioning of 80 x 200 mm h 240 mm, the length of the upper base is 48 mm. From the end of the upper base at an angle of 110 °, a notch to the depth of 0.50 h is made. At h 240 mm, the depth of cut is 120 mm.

EXAMPLE 2. The slabs are an equilateral trapezoid with an angle at the lower base of 27 °, an upper base length of 0.22 l. For h 240 mm, the length of the upper base is 52.8 mm. From the end of the upper base of the trapezium at an angle of 115, a cut is made to a depth of 0.52 h. At h 240 mm, the depth of cut is 124.8 mm.

Example The slabs are an equilateral trapezoid with an angle of 30 ° at the lower base and an upper base of 0.25 h. At h 240 mm, the length of the upper base is 60 mm. From the end of the upper base of the trapezoid at an angle of 120 °, a notch to a depth of 0.55 h is made. At h 240 mm, the depth of cut is 132 mm.

The device works as follows.

In the initial position, the tilter is located at the end of the rack. After processing one face of the workpiece 1, the carriage 2 is set in motion by means of a cable or chain 6. The workpieces move to the side face of the slab 3. The first workpiece is smooth

shifts to a flanging notch in which it is turned 90 °. When the trolley tilter continues to move, the subsequent billet doctures the first billet to 120-130 °. after which, under the action of its own weight, it is docked to 180 ° and slides along the side of the slab to the racks' bars.

Thus, when the cart passes from one end of the rack to the other, all the blanks on the rack are turned by 180 °.

The technical and economic advantages of the proposed turner are that, in comparison with the prototype, with the continuity of the process, it can increase the angle of turn and increase productivity.

Claims (1)

Claims of the invention A 180 ° tilter of flat blanks comprising a trolley with vertical slabs, each in the form of a beveling wedge with upper and lower bases, two inclined edges and a rectangular cut-out mounted for movement along the rails between the rails of the racks by means of flexible traction element, characterized in that, in order to increase productivity due to the continuity of the canting process, the inclined faces of the slabs are made with angles at the lower base equal to 25-30 °, the length of the upper base vania equal to 0.20-0.25 of the height of the working part of the slab, and a rectangular cut is made from the end of the upper base to a depth of 0.50-0.55 of the height of the working part of the slab, with the larger side of the cut inclined to the upper base at an angle of 110- 120 °. R 2 5 6 Rig.Z Fig.C Rig. five Rig.6FrP fttt.7 m 10 FIG. eleven Rig. 13 one Riga.K Figm