SU831274A1 - Unclampable punch - Google Patents

Description

I

The invention relates to the distribution of pipe diameters by treatment with a grout.

The expanding punch is known, which holds the pyramid mandrel with and on the guides. segments with parappie side surfaces, as well as rigidly mounted on the mandrel, a pin with a corner at the apex equal to the angle between the lateral planes of the flat end of the flj.

However, when using a core punch in the gap between the segments, the segments are deformed along a straight line, which leads to a cut on the finished part.

The purpose of the invention is improving the quality of parts.

The goal is achieved by the fact that in the punch the height of the wedges is made equal to the height of the segments, and their outer profile is similar to the profile of the segments.

FIG. 1 schematically shows a pinch pin in two projections, at the time of deformation in FIG. 2 is the same at the time of termination of the information.

The expanding punch contains a frame 1 having the shape of a truncated pyramid, on the edges of which the guiding elements 2 are fixed. On the guides there are segments 3, the charge between which has a wedge shape with: 10 oi / angle. Below the segments 3 are fixed on mandrel 1 a wedge 4 having an outer contour similar to the outer contour of segments 3. The angle between the side planes of the wedge is equal to сА. 15 The number of wedges 4 is equal to the number of gaps between the segments 3, and the plane of symmetry of the wedges coincides with the plane of symmetry of the gaps between the segments 3. For fixing the shell 5 in the process of deforming, there are spigots 6 on the segments.

The expanding punch works in the following way.

The shell S is mounted on pins 6 (Fig. 1). When the segments 3 move along the guides 2 downwards, the shell 5 is reshaped in the direction of the rails. At the same time, the pin 4 is inserted into the gap between the segments 3 (Fig 2). The claws of segments 3 and the pin 4 are at the same level and form a punch without gaps, the shaping is completed. In the result, there is a cemetery without cut.

Testing of expansion punch was carried out.

Welded shells are welded by blanks from the 08KP staples with a diameter of 320 mm, topside 2.5 mm and a width of 172 mm. A truncated cone is produced from this shell with a larger diameter equal to 370 mm and a smaller diameter equal to 330 mm. For Otsin worker hots get ceta without cut. This makes it possible to reduce the laboriousness of manufacturing parts by half (as compared with the shaping in two stages), which is equivalent to an increase in labor productivity twice. In addition, as experiments show, the oppression of the workpiece material in the gap between the sectors is reduced compared with the shaping on the known device. Consequently, the product is obtained with a greater bearing capacity, i.e. its quality is improving.

Claims (1)

Invention Formula An expanding punch containing a pyramidal mandrel with guides on which segments with parallel side surfaces are located and a wedge rigidly fixed on the mandrel with an angle at the vertex equal to the angle between the lateral planes of the adjacent segments, in order to increase the quality of the parts, the wedges are made with a height equal to the height of the segments, and their outer profile is similar to the profile of the segments. Sources of information taken into account in the examination 1. USSR Patent No. 58081О, cl. B 21 33 41/02, 1973. T fPae.l 7