SU967696A1 - Die for cutting rod material - Google Patents

Description

The invention relates to the processing of metals by pressure and can be used in mechanical engineering for cutting bar material by shear.

Known stamp for cutting bar material containing a movable plate, a housing with two tool blocks placed in it, each of which is made in the form of clamping and cutting inserts with knives, and two supporting elements made in the form of cylindrical segments mounted in the housing with rotation and the interaction of flat surfaces with convex profile sections of the liners, and cylindrical surfaces - one of them with a movable plate, and the other with the body [1].

However, bar cutting occurs with chipping, since the clamping force decreases by the end of the cutting process. In addition, due to the fact that the axis of rotation of the segments are offset relative to each other, significant deformations of the stamp and press occur, which leads to a deterioration in the quality of the reea.

The purpose of the invention is to improve the quality of the cut.

This goal is achieved by the fact that in the stamp for cutting rod2 material, containing a movable plate, a housing with placed in it. two tool blocks, each of which is made in the form of clamping and 5 detachable inserts with knives, and two supporting elements made in the form of cylindrical segments mounted in a housing with the possibility of rotation and interaction of flat surfaces · * 10 with convex profile sections inserts, but with cylindrical surfaces, one of them with a movable plate, and the other with a body, profile sections of the inserts of the image, 5 are inclined arcuate surfaces

with the same slope relative to the * case, and the axis of rotation of the cylindrical segments are located in the cutting plane.

2Q Figure 1 shows the stamp, the initial position; figure 2 is the same, the end of cutting; in Fig.Z - section aa in Fig.1; figure 4 is a graph of the change in effort with decreasing cut section.

“The stamp includes a movable plate 1 and a housing 2, in which the upper 3 and Lower 4 detachable liners, the upper 5 and lower 6 clamping liners are installed. The surfaces of liners 3-6, facing away from the bar, are convex, for example, circular cylindrical, and are inclined relative to the housing in the same direction. . The liners 4 and 6 lie on the flat surface of the lower supporting element 7, the opposite surface of which is made circular cylindrical and rests on the carrier of the housing 2. Under the movable plate 1, the upper supporting element 8 is installed, the same as the element 7, resting on the profile surfaces of the liners 3 and 5 with its flat surface. In the inserts 3-6 inserted two pairs of interchangeable knives 9.

To return the stamp parts to their original position, the liners 5 * and 6 are spring loaded relative to the housing 2 by a spring 10.

The stamp works as follows: in the upper position of the press slider, the inserts 3-6 are apart, the replaceable knives 9 are on the same level, providing access to the bar in the stamp. When the press slider moves down, the plate 1 presses on the support element 8, which transmits the force to the contributions 3 and 5. The insert 3 moves down to the stop with knives 9 in the bar, after which the insert 5 also moves down, also to the stop in the bar. With the upper inserts 3 and 5, the bar is pressed by the book 4 and 6, a four-link articulated joint is formed, which tends to take an equilibrium position under the influence of the press force, which is prevented by the bar. As soon as efforts to. the cutting planes will exceed the tensile strength of the bar material, the detachable part is shifted, the supporting elements 7 and 8 are rotated around their axis, their flat surfaces roll along the cylindrical surfaces of the inserts 3-6, shifting the lines of application of the clamping forces to the cutting plane, and the lines application of force / cut: from the flat bone of the cut. Despite the fact that the cutting resistance decreases as the shear is carried out, the clamping force is shear, and the final shear force remains, the displacement of the line of its application to the line of application of the force transmitted from the press slide decreases more slowly than the significant force before dividing the bar.

Due to this cutting, the bar material remains in a plastic state, the horizontal components of the effort from the press slide tend to bring the liners closer, which also creates favorable conditions for obtaining high-quality end parts of the cut billets.

Compared with the known, this stamp allows you to get high-quality workpieces.

Claims (2)

bulging, for example circular cylindrical, and inclined relative to KOlpnyca in the same direction,. . Inserts 4 and 6 lie on the flat surface of the lower support element 7, the surface of which, opposite to the flat one, is made circularly cylindrical and rests on the carrier body 2. Under the movable plate 1, an upper support element 8 is installed, identical with element 7, resting on the profile surfaces of the liners 3 and 5 with its flat surface. Two pairs of replaceable knives 9 are inserted into the inserts 3-6. To return the stamp parts to their original position, the inserts 5 and 6 are spring-loaded relative to the housing 2 by the spring 10. Stamp work: r as follows In the upper position of the press slide, the inserts 3-6 are moved apart, replaceable knives The 9 is flush, providing bar access to the stamp. When the press ram moves downwards, the plate 1 presses against the supporting element 8, which transmits the force to the liners 3 and 5. The liner 3 moves down / up to the stop with the knives 9 into the rod, after which the valve 5 moves down and also into the rod. The upper liners 3 and 5 of the bar are pressed against the lower 4 and 6, and a hinged four-link is formed, which tends to occupy an equilibrium position under the influence of the pressing force, which is prevented by the bar. As soon as effort in. the cutting plane will exceed the ultimate strength of the bar material, the separated part is shifted, the supporting elements 7 and 8 rotate around their own axis, their flat surfaces roll along the cylindrical surfaces of the inserts E-6 displacing the line of force of the clamp to the plane of the cut, or the Research Institute of force cut: yy from the cut plane. Despite the fact that the cutting resistance decreases as the shearing proceeds, the clamping force of the displacement line of its application to the line of application of the force transmitted from the press slide decreases more slowly than the shear force and remains significant until the final separation of the bar. Because of this, until the end of the cutting, the bar material remains in the plastic state, the horizontal forces from the press ram tend to bring together the inserts, which also creates favorable conditions for obtaining high-quality end parts of the cut blanks. Compared with the known, this stamp allows to obtain high quality blanks. Claims of the invention: A stamp for cutting bar material containing a movable plate, a housing with two blocks of tools placed therein, each of which is made in the form of three-sided and cut-off inserts with knives, and two supporting elements made in the form of cylindrical segments installed in case with the possibility of rotation of: and the interaction of flat surfaces with vyiuklmi core sections of the insert, and cylindrical surfaces, one of them - with a movable plate, and the other - with the case, then, with the aim of improving the quality of the cut / profile sections of the liners are formed by inclined arcuate surfaces with the same inclination relative to the body, and the axes of rotation of the cylindrical segments are arranged flat (cutting cut. Information sources taken into account during the examination 1. USSR author's certificate NI 727342, class B 23 O 23/00, 1978 (prototype).