SU990389A1 - Die for upsetting flanges with flat facets on tube blanks - Google Patents

Description

one

The invention relates to the processing of metals by pressure and can be used in the preparation of flanges at the ends of pipes.

A device for the landing of the bulges at the ends of the pipes is known, which contains a holder, a supporting sleeve, a punch, a piston and an incompressible material 1.

A known chip for stripping the bulges at the ends of the tubes, comprising a split matrix, a heading punch, a pressing device consisting of elastic split rings and segment clamps radially pressed by the spring 2.

The drawbacks of the device are the possibility of stamping only round thickening in the cross section, low quality of the products due to the flow of deformable material into the gaps of the split rings, and a small degree of deformation due to the limited elastic deformation of the split rings of the pressure device.

The goal. invention is the expansion of technological capabilities and improving the quality of products.

This goal is achieved by the fact that there is a die for upsetting flanges with flat edges on the tube blanks; containing a landing punch, a detachable matrix with a clamp placed in it, made in the form of destructive sections, in contact with each other and installed with a potential radial movement, is provided with wedges evenly located in the matrix along its inner surface, wedges interacting with the sections, while the sections made with barrel edges, and the working surfaces of the faces are interconnected.

In addition, the number of sections is equal to the number of faces formed on the flange.

FIG. 1 shows a device

5 general view; in fig. 2 - stamp in the deformation zone at the initial moment, cross section; in fig. 3 - the same, in the middle of the process; in fig. 4 - the same at the end of the landing.

20 A stamp consists of a matrix 1 having a transverse connector. In the longitudinal channel of the matrix, there is a landing punch 2 acting on the end face of the workpiece 3. In the connector zone of the matrix 1, a shaping cavity 4 is made in which the clamp is located in the form of sections 5 interacting with each other without a gap and forming a closed contour with adjacent surfaces of working faces. A wedge 6 is located in the lateral longitudinal channels of the matrix and is in contact with sections 5.

The stamp works as follows.

Pipe billet 3 is placed in the longitudinal channel of the mandrel. A press slider (not shown) acts on the wedge 6, which in turn acts on sections 5, which are in contact with the pipe billet 3, in the drop-off area of the flange. Section 5 compresses the pipe billet 3 in the radial direction, while the material of the preform, deforming, fills the cavity of the chip formed by the surfaces of the matrix 1 and the working edges of the clamp sections (Fig. 3). Thus, the tubular billet 3 is compressed and does not have free surfaces that are not in contact with the working elements of the stamper, and is constantly loaded with radial compressive forces, thereby eliminating the possibility of loss of stability of the billet wall during its axial compression.

After the workpiece material has filled the forming cavity 4 of the shtamp, the press slider comes into contact with the punch 2, which is moved by the force of the press, loads the tube billet 3 with axial compressive stresses, resulting in the formation of the workpiece in the deformation zone forming a flange on the billet 3. As the material in the shaping cavity 4 is set, the shtamp section 5 moves apart in the radial direction. In the deformation zone, the tubular billet is loaded with the axial forces necessary to deform the billet and radial forces preventing the buckling of the wall of the billet during the entire upsetting process. Over the entire boundary of the deformation zone, the workpiece is in contact with the rigid elements of the stamp, which provides

technological capabilities of landing and high quality of the landed product.

The proposed chip, in comparison with the known, provides for the expansion of the technological capabilities of the landing and its high quality by ensuring the production of various flange sizes (height, area in plan).

Claims (2)

1. A stamp for planting flanges with flat edges on tubular billets, containing a upset punch, a separable matrix with a clamp placed therein, made in the form of shaping sections, which are in contact with each other and installed with the possibility of radial movement, characterized in that technological capabilities and improve the quality of products, it is equipped wedges, which interact with sections, are uniformly located in the matrix along its internal surface; the sections are made with working faces, and the working surfaces of faces are conjugate to each other. 2. A stamp in accordance with claim 1, characterized in that the number of sections is equal to the number of faces formed on the flange. Sources of information taken into account in the examination 1. USSR author's certificate No. 566665, cl. At 21 J 5/08. 2. USSR author's certificate No. 439335, cl. B 21 J 5/08, 1973 (prototype).