SU1666246A1 - Die for making flats on parts - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to dies for removing faces from parts. The purpose of the invention is to increase the service life of the stamp and the quality of the parts produced. The stamp for removing the lips on the parts contains an upper plate with a spring-loaded clamp, two punches, a lower plate with a matrix and elements of its centering relative to the punches, as well as an additional spring-loaded clamp-remover. When lowering the punches, they move relative to the die, centering the rotating wear-resistant balls of its horizontal screws and making chamfers from the part. 2 hp ff, 3 ill.

Description

The invention relates to cold forming, in particular, to dies for removing bald faces on axles and shafts, for example, on axles of pedals and connecting rods of a children's bicycle.

The purpose of the invention is to increase the life of the stamp and the quality of the products obtained.

Figure 1 presents the stamp, a general view; figure 2 is the same, top view; on fig.Z - section aa in figure 2.

The stamp for removing the lips on parts, mainly of the type of axles and shafts, contains the upper plate 1 with lance holder 2 and two punches 3, installed symmetrically relative to the longitudinal axis of the stamp.

The clamp 4 is fixed to the top plate 1 with screws 5 and is spring-loaded from above by springs 6. On the bottom plate 7, a matrix 8 is installed with a cavity 9 under the part. In the matrix 8, horizontal screw elements 10 are installed with a cavity at the end, in which a wear-resistant rotating ball 11 is placed, in contact with the punches 3.

The additional puller 12 is located under the main clamp 4, fastened to the bottom plate 7 by pins 13 and screws 14 with the possibility of vertical movement and is spring-loaded from below by springs 15 installed in holes made in matrix 8. Screw heads 14 are in stepped holes 16 in the bottom plate 7.

The stiffness of the springs 15 is less than the stiffness of the springs 6. The punches 3 are multi-faceted with a number of faces not less than four, and each face is made two-step in longitudinal and transverse sections with the working part in the form of a protrusion 17. The lower ends of the punches are mounted on a homing road landing, and the protrusions 17 are installed with a gap.

ABOUT

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Ball 11 protrude to half the tolerance of the landing landing.

The stamp works as follows.

The part is placed in the cavity 9 of the matrix and pressed by the clamp 4 and the additional clamp-remover 12. After fixing the part, the punches 3 under the action of the press ram are lowered, the ends of the protrusions 17 come into contact with the part and remove the pieces from both sides of the part or misaligned pieces on both ends parts, if the punches are set at the desired distance from each other along the longitudinal axis of the stamp. In this case, being located at the lower ends in the holes 18 and the die 8, the punches are in contact with the wear-resistant balls 11 and in the upper position they do not exit the holes 18, thereby not being squeezed by the shear resistance force.

At the end of the treatment, the bald patches 3 rise under the action of the springs 6, simultaneously the presser 4 rises. At the same time, under the action of the springs 15 the additional presser lifts 12 to a limited height up to the stop 14 heads in the steps of the openings 16, the Part if it remains on punches in contact with the puller 12 and removed from the punches.

In case of wear of one of the lower cutting edges of the protrusions 17 of the punches 3, each of them rotates up to 90 ° depending on the number of faces. This will work alternately lower cutting edges of the protrusions of each face of the punches. To use the upper cutting edges, the punches are moved upside down.

When the lower ends of the punches are worn by feeding the screw elements 10 before the balls come into contact with the punches, a gap is again provided between the balls 11 and the punches 3, equal to half the tolerance of the running fit.

Claims (3)

1. A shtamp for removing bald spots on parts, mainly of the type of axles and shafts, containing a top plate with a spring-loaded clamp, two punches placed symmetrically with respect to the longitudinal axis of the punch, as well as the lower plate with a die having a cavity for the workpiece and holes for punches, characterized in that, in order to increase the duration stamping and quality of the products, it is equipped with an additional spring-loaded puller clamp placed under the main clamp on the bottom plate, with the possibility of limited vertical movement, and the additional clamp-puller springs are made with less rigidity than the main clamp springs, the matrix is equipped with its centering elements with respect to the punches, and the latter are multi-faceted with an even number of faces, each face being made two-step in the longitudinal and transverse directions sloth, with a working part in the form protrusion. 2. A stamp according to claim 1, characterized in that the elements of the centering of the die relative to the punch are made in the form of horizontal screws with cavities at the ends in which wear-resistant balls are placed so that they can rotate and interact with the punches. 3. A stamp according to claim 1, characterized in that the matrix is made with holes under the spring additional clamp-puller. / 9frZ999l Fi.Z