SU1233985A1 - Die set for bending pipes - Google Patents

Description

The invention relates to the processing of metals by pressure, in particular to bending strains, and can be used in the bending of pipes, sheet metal, as well as rolled round and square cross sections.

The purpose of the invention is to reduce the wear of the brook inserts, expanding the technological capabilities and improving the quality of parts.

Figure 1 shows a stamp for bending pipes, the initial position; figure 2 - the same, in the process of bending; on fig.Z - the same, at the end are flexible; figure 4 - section aa in fig.Z.

The pipe bending punch contains a punch 2 fixed on the top plate with a working stream 3, two semi-matrices 4 with brook inserts 5. Each semi-matrix 4 is installed rotatably relative to the axis 6 of the support 7 fixed on the bottom plate 8 with the possibility of horizontal movement. Along the axis of the punch 2 is installed clamp 9 with a stream for laying the pipe. The clamping force of the workpiece is created by the buffer 10.

The inserts 5 are rigidly connected to the semi-matrix 4 and fixed at a distance equal to R - d / 2 from the axes 6 of the hinges of the semi-matrix 4 to the base of the stream, where R is the bend radius of the product or the outer radius of the punch; d is the outer diameter of the bent pipe.

Consequently, this distance is equal to the distance from the axis of the punch to the base of its working stream. The distance from the axis of the punch to the axes of the joints of the semi-adatrices

0

five

0

0

MUST be equal to 2R, i.e. the outer diameter of the punch.

The stamp works in the following way.

The workpiece 11 is placed in the brook insert 5 semi-matrix 4 and clamp 9. When the punch 2 moves down, the clamp 9 fixes the blank 11, pressing it to the punch. Upon further movement of the punch 2, the clamp 9 is lowered, squeezing the buffer 10. The preform 11 under the action of the punch is refracted, turning the semi-matrix 4. The semi-matrix is rolled around with the preparation along the working brook of the punch. At the end of the operation, the bend lifts the punch and removes the curved part.

When changing the production object, namely when changing the cross-section of the workpiece or bending radius, the punch and stream inserts are replaced, the half-matrix is moved, maintaining the distance from the axis of the punch to the axes 6 of the semi-matrix hinges equal to the outer diameter of the punch. In this position, the supports 7 of the semi-matrix are fixed on the bottom plate 8.

The use of the proposed die for bending allows improving the quality of manufactured parts due to the location of the axes of the semi-matrix hinges at a distance from the axis of the punch, equal to the outer diameter of the punch, which allows the workpiece to roll around without slipping relative to the brook inserts. The lack of slippage of the workpiece increases the durability of the stream inserts. The proposed stamp also makes it possible to expand the technological capabilities by providing flexible parts with a bending radius R 2d. /

FIG. 2

(pus. 3

Cpuz. four"

Claims (1)

PIPE BENDING STAMP containing a punch fixed to the top plate with a working stream, two rotary half-matrices with spring inserts and counterpressure elements symmetrically mounted relative to the punch on the bottom plate, characterized in that, in order to reduce wear of the stream inserts, expand technological capabilities and improving the quality of parts, the distance between the axes of the hinges of the semi-matrices and the bases of the streams of their respective inserts is equal to the distance from the axis of the punch to the base of its working about the stream, and the distance from the axis of the punch to the axis of the hinges of the half-matrix is equal to the outer diameter of the punch. Figure 1 co with co with oo SI