SU1007862A1 - Method and apparatus for cutting rolled stock - Google Patents

Abstract

1. A method of cutting rolled metal into dimensional workpieces, including local thinning of the rolled metal by extruding the ring grooves with a wedge cross section and the shear separation of the part of the rolled steel enclosed between the circumferential grooves, that is, In order to improve the quality of the ends of the blanks and the adjacent areas, before separation by shear, the volume of metal extruded from the annular groove is rolled into the cavity of the groove, restoring the original cylindrical shape of the car.

Description

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2.- The method according to claim 1, characterized in that the direction of the coercive force is gradually changed from the car inclined to the axis at an angle of 30-45 ° to the perpendicular angle.

3. The method according to claim 1, of which is the fact that the wedge ditch-1 is folded with a concave curved shape of the core and a relative depth of 0.3-0.5 wall thickness

when cutting pipes and 0.2-0.3 diameter of the workpiece when cutting rods.

4. Device for carrying out the method according to claims. 1 to 3, comprising a rolling supply mechanism, a mechanism for pressing out annular grooves with working elements in the form of rollers provided with a rotary drive.

and translational motion and spaced apart distances of the cut workpiece, and a stamp

for shearing cutting, characterized in that the working surface of the first roller in the rolling feed direction is made with curvilinear generators, the meeting tangents of which lie in the range of 45-60 ° at the roller top to 15-20 at the base, and forming the working surface of each subsequent rollers are made V-shaped with an angle determined from the following ratio

y (1. + (p-1) (30-45), Where p is the angle of meeting of the external forming convexity formed by the volume of metal squeezed out of the wedge groove;

n is the order number of the roller, while forming the working surface of the last roller is parallel to the axis of hire.

The invention relates to the processing of metals by pressure, in particular to methods and devices for cutting rolled products, and can be used for dividing, into lengths of rods and pipes. - There is a known method of cutting coarse rolled products into dimensional workpieces, including the application of the risks of a stress concentrator and the subsequent breaking of a billet. The hub reduces the strain force, however breaking by bending does not provide the required quality of the workpieces. The closest to the proposed by the technical essence and the achieved result is a method of cutting rolled products into dimensional ones, including local thinning of rolled products with extrusion of ring grooves. wedge section and shear separation of the part of the rolled product enclosed between the adjacent rings by the grooves 2 The method is carried out with a device comprising a rolling supply mechanism, a mechanism for extruding the annular grooves with rollers provided with a drive of rotation and translational motion, and a shear cutting die 2 provides the required quality of cut blanks, since the indentation of the rollers forms flows, metals on the surface of the workpiece, and significant efforts clamping the rolled stock additionally sparkle t he form: end parts cut pieces are conical teaching ki. Cylindrical blanks are usually required for machine parts. The purpose of the invention is to improve the quality of the ends of the obtained blanks and adjacent areas. This goal is achieved in that, according to the method of cutting rolled metal into dimensional workpieces, including local thinning of the car by squeezing out annular grooves with a wedge cross section and shear separation of the part of the rolled metal enclosed between adjacent annular grooves, before shear separation, the metal volume extruded from the annular groove is rolled into the floor grooves, restoring the original cylindrical shape of the car. The direction of the rolling force can be gradually changed from the inclined to the axis of the car at an angle of 30-45 ° to perpendicular. The wedge groove can be filled with a concave curved. forming form and relative depth of 0.3-0., 5 TOL1DITSY walls when cutting pipes and 0.2-0.3 diameter of the workpiece when cutting rods. In the device containing the rolling machine, the extrusion mechanism of the annular grooves with working elements in the form of rollers, equipped with a rotational and translational drive and spaced apart from each other and a die for cutting shear, the working surface of the first roller in the direction of rolling roller made with curved generators, the meeting angle of tangents to which lies in the range from 45-90 ° at the top of the roller to 15-20 at the base, and forming the working surface of each subsequent roller and are V-shaped with an angle determined from the following relationship:

y (L + (p-1) (30-45), where ft is the angle of meeting of the external components of the convexity formed by the volume of metal, tal; squeezed from the wedge groove;

n is the order number of the roller, while forming the working surface of the last roller is parallel to the axis of hire.

The implementation of the working elements of the mechanism of installation of the wedge ditch-. This method allows to obtain a weakened section in the form of a wedge ring groove, and then restore the original cylindrical shape of the rolled product by rolling up the formed metal influx into the groove. As a result, the concentrator has the form of deep annular risks, which makes it possible to increase the quality of the cut piece during the subsequent shear separation.

FIG. Figure 1 shows the pattern of extrusion of a groove; in fig. 2 - shear cutting scheme ;. in fig. 3 - a device that implements the method of cutting rolled metal, general view; in fig. 4 — groove insertion mechanism; FIG. 5 is a section A-A in FIG. four; in fig. 6 - deforming rollers; in fig. 7 shows the construction of a wedge roll roll knife; in fig. 8 shows the construction of a rolling roll; in fig. 9 is a stamp for shearing.

The device for cutting the rental includes a rental feed mechanism 1 providing axial movement of the pipe or bar with a pitch equal to the length of the workpiece being cut, an annular groove extrusion mechanism 2 designed for rolling narrow circular voltage concentrators onto the rolling stock, as well as a shear stamp 3 installed on a universal press 4. The work of the individual mechanisms is synchronized with each other in time.

The ring-mounting mechanism 2 comprises a base 5 on which support rollers b supporting split rolling are mounted, and auxiliary supports 7 freely rotate, which serve for lateral fixation of the car at the beginning, when the front end is still -1

Does not rely on the right pair of support rollers. On base 5, racks 81 are also installed, carrying the top plate 9. A power cylinder 10 is mounted in the top plate, the rod of which is rigidly connected to the crosshead I, on. the working elements of the mechanism of extrusion, annular groove, wedge disk KNOW 12 and rolling rollers 13-15, driven in rotation are installed. by means of the electric motor 16, through the reducer 17, the traverse 11 moves relative to the plate 9 in the guides 1 (3.

The working elements of the extrusion mechanism of the annular groove are spaced from each other at a distance equal to the length of the cut blank. At the same time, the working surface of the first roller in the roll feed direction is made with curvilinear shapes, the angle of tangent to which varies from 45-60 at the top of the roller to 15- 20 ° at the base (Fig. 7), and the angles between the generators of the working surfaces of the roll rollers, which in this case. equal to 120 °, 160, calculated from the dependencies. .

U p 1 n- (p-1) (.30-45 °), where p is the angle of the meeting of the external forming convexity, formed by the volume of metal extruded from the wedge groove;

n is the serial number of the roller. Forming the working surface of the last roller is parallel to the axis of the cat kat ..

The punch, for shearing, is double-support (Fig. 9) and comprises a bottom plate 19 connected to the top plate 20 of the guide columns and sleeves. At the bottom there are semi-matrices 21 rotating the auxiliary support 22 and abutment abutment 23., which serve to limit the step-by-step supply of the car in the period when the rear end of the rod has left the feeder. On the top plate of the stamp there is a punch 24 in the form of a half sleeve, covering the rolled steel on top, and clamps 25, pressing the rolled steel to the semi-matrix.

The device works as follows.

The feed mechanism 1 feeds the rolling 26 into the ring groove pressing mechanism 2 to a temporary stop (not shown) located in such a way that the end of the rolled stock stops under the first rolling face. In this case, a signal is generated that turns on the electric drive of the movement of the working elements of the mechanism. 2, fluid is fed to the upper lanes.

the hydraulic cylinders 10, as a result of which the yoke 11 is fed to the rolling, the wedge disk 12 can come into contact with the divided rolling and, due to the forces of friction, draws the latter into rotation while rolling into the rolling. Rolling holds the left supporting roll, roller b and left auxiliary support 7 from tilting. When the predetermined groove depth is reached, the hydraulic cylinder returns the yoke to its original position, the feed mechanism feeds the rolling by a step equal to the length of the cut piece. After the end of the feed, the next introduction of the wedge knife into rolling follows, and, together with the formation of a new wedge groove, the deforming roller 13 rolls the volume of metal extruded from the first groove into the cavity cavity. The operation cycle described is repeated.

After the area near the groove formed by the wedge knife undergoes processing under all the rollers on the car, a narrow deep ring stress concentrator is formed, the car surface is characterized by the correct

cylindrical shape. The distance between adjacent annular concentrators corresponds to the cut length of the workpiece.

as it is fed, the rolled enters the double-sided stamp 3 and reaches, the stop 23, which is pulled to the left in the initial position. This produces a command to retract the right stop 23 and turn on the press 4. The punch 24 separates the rolled over weakened sections, with one billet being removed injected through the hole in the lower die plate, the other remains in the die and removed during the next rolling. In the established work process, the press is turned on after two innings of rolled products per step, the stop 23 does not participate in the work. When processing the last blanks, when feeding, the rear end of the rolled product is pushed by the next rod with the control on the retracted stop 23 or manually against the stop.

25 Compared to the prototype, the use of the invention allows to improve the quality of the resulting blanks.

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Claims (4)

1. A process for cutting to length of rolled comprising local thinning of the annular grooves rolled extruded with klinovm cross section and separation shear rolled portion that is sandwiched between adjacent annular grooves of m and l ^£ h and w and d w i with the fact that, with in order to improve the quality of the ends of the obtained preforms and adjacent sections, squeezed out of the annular groove before separation by a shift> the volume of metal is rolled into the cavity of the groove, restoring the original cylindrical shape of the rolled product. SS ω Fig. { 2. · The method according to π. 1, characterized in that the direction of the rolling force is gradually changed from inclined to the axis of the rolling at an angle of 30-45 ° to perpendicular. 3. The method according to π. 1, due to the fact that the wedge ditch-1 ku is performed with a concave curvilinear shape of the generators and a relative depth of 0.3-0.5 wall thickness • when cutting pipes and - 0.2- 0.3 diameter of the workpiece when cutting bars. 4. Device for implementing the method of popp. 1-3, containing a rolling feed mechanism, an extrusion mechanism for annular grooves with working elements in the form of rollers equipped with a rotary and translational drive and spaced from each other at a distance of the length of the workpiece being cut, and a stamp for shear cutting, distinguishing The fact is that the working surface of the first one in the direction of supply of the rolled metal is made with curvilinear generators, the angle of meeting of the tangents to which ranges from 45-60 ° at the top of the roller to 15-20 ° at the base, and the generatrices of the working surface the bridges of each subsequent roller are made V-shaped with an angle determined from the following relation Y = (b + (n-1) (30-45), Where p is the angle of contact of the external generatrices of the bulge formed by the volume of metal extruded from the wedge groove; η - serial number of the roller, 'while forming the working surface of the last roller is parallel to the axis of the rental.