SU1186330A1 - Die for piercing holes of small diameter in sheet work - Google Patents

Description

The invention relates to the processing of metals by pressure, in particular to dies

for punching holes of small diameter

in sheet blanks.

The purpose of the invention - qualitative improvement of ₅ Islands of receiving the item. "

FIG. 1 shows the proposed stamp, section; in fig. 2 - section A — A in FIG. one.

The stamp contains a movable plate 1, a holder 2 with a stepped cavity in which a punch 3 with a collar is placed, a backing plate 4, a telescopic clamping sleeve 5, an additional clamp 6, whose cross-section is C-shaped, elastic elements, you are _{5 complete} in the form of springs 7, and two sets of rollers.

Each kit contains two rows of rollers. The rollers of the first row 8 are installed with the ability to interact with the additional clamp 6, and the rollers 20 of the second row 9 are installed with the ability to interact with the rollers of the first row 8 and the backing plate 4. Between the rollers of the second row and the springs 7 are installed the sliders 10. One of the rollers 11 of the second

row 9 can be rigidly fixed in the movable part of the stamp with the possibility of interaction with the sleeve 5. Processed

The material is indicated by the position 12. Stamp

works as follows.

During the course of the movable part of the punch down, an additional clamp 6 and the rollers of the first and second rows, forming a closed power system, interact with the material 12 to be processed with a hard blow. Upon further lowering of the movable part of the stamp, the rollers of the second row 9 move from the axis of pressure of the stamp following the sliders 10, compressing the springs 7.

During the course of the movable part of the stamp up processed material 12 using pushers (not shown), acting on the additional clamp 6, is removed from the punch 3. The rollers of the first and second rows are returned to their original state under the action of springs 7.

The proposed stamp will improve the quality of the parts by increasing the pressing force and increasing the accuracy of the direction.

D- / 1

Claims (4)

1. STAMP FOR PUNCHING Small diameter holes in the sheet metal part having installed in its stationary part of the matrix mounted on the movable plate die holder with a stepped cavity, which houses the punch with collar, backer tile secured to the movable plate, and a telescopic clamping sleeve, the engagement punch, wherein the fact that, in order to improve the quality of the parts produced, it is provided with an additional clamp installed in the cavity of the holder with the ability to move relative to it at least two sets of rollers arranged symmetrically with respect to the pressure axis of the punch, each set contains two rows of rollers arranged along the pressure axis of the punch with the possibility of interaction of the first row of rollers with an additional clamp, and the rollers of the second row with the first row of rollers and backing tiles arranged with interactions with the rollers of the second row and symmetrically with respect to the pressure axis of the stamp by elastic elements made in the form of springs, the axes of which are perpendicular to the axes of the rollers. 2. Stamp on π. 1, characterized in that the additional clamp is made with a U-shaped cross section. 3. Stamp on π. 1, characterized in that one of the rollers of the second row of each set is rigidly fixed in the movable part of the stamp with the possibility of interaction with the sleeve. 4. Stamp on π. 1, characterized in that the force P created by the elastic element is determined by the dependence ^p = where is <? - force clamping material; M - the number of sets of rollers; H - the radius of the rollers of the first row; p is the radius of the second row rollers. δ and „„ 1186330 7 > 1186330 one