Stamp for drawing body parts of complex shape

 

The invention relates to a cold sheet metal stamping. Stamp for drawing body parts of complex shape contains the punch, the matrix pertainym threshold and pertainym ribs and clamp with pertainym ribs. First puritaine edge on the clamp is installed between pertainym threshold matrix and the first pertainym edge of the matrix, and the following preteenie edges of the clamp are installed respectively between pertainym edges of the matrix. Improved quality of stamping parts, as well as the saving of sheet metal. 2 Il.

The invention relates to a cold sheet metal stamping and can be used for drawing of various sheet materials, mainly for stamping body parts of complex shape of cars, buses, agricultural machinery, household appliances.

Known exhaust stamp containing the punch, the matrix pertainym rapids and clamp with grooves under preteenie thresholds (Romanovsky, B. N., Handbook of cold stamping. - Leningrad, Izd. “Engineering”, 1971, S. 230, 231, Fig. 190). When the hood shallow parts of simple form application pertainig thresholds provides a good SEL metal and savings of sheet metal compared using pertainig edges or flat clamp.

A disadvantage of the known exhaust stamp using pertainig thresholds is insufficient braking when the drawing of parts of complex shape and large depth, and the inability of differential braking flange of the blank during drawing.

Famous stamp for drawing body parts, containing the other one, the matrix pertainym threshold and pertainym edge, placed directly behind pertainym threshold and clamp with the corresponding recesses under preteenie thresholds and edge (patent RF №2047407, 21 D 22/02, 1995). This solution makes it possible to achieve savings of metal and intense braking flange billet hood.

A disadvantage of the known exhaust stamp is limited scope for parts rather simple forms, which do not require alternating alternating bending of the flange of the workpiece.

Famous stamp for drawing body parts of complex shape, taken as a prototype, containing the punch, the matrix pertainym threshold and pertainym ribs and clamp with pertainym ribs (D. Skvortsov, fundamentals of design of dies for cold sheet metal forming. - Moscow, publishing house. “Engineering”, 1972, S. 265-267).

The disadvantage of the prototype retinue edge is situated at a considerable distance from the opening of the matrix, based on the conditions of the strength of the matrix and clamp. If you exhaust the stamp is missing puritaine edge for pertainym threshold or the first row of ribs, then in the process of drawing will be missing alternating alternating bending elements of the flange of the workpiece. Because of this, when the drawing of parts of a rather complicated form and great depth in the workpiece arise residual stress, which leads to a distortion of the shape of parts after removal of the load or after trimming the exhaust passage, respectively, decreases the quality and accuracy of body parts.

The objectives of the present invention is to improve the quality of stamping parts, as well as the saving of sheet metal.

The tasks are solved due to the fact that in the exhaust stamp for pertainym threshold matrix set several rows pertainig edges, the first puritaine edge on the clamp is installed between pertainym threshold matrix and the first pertainym edge of the matrix, and the following preteenie edges of the clamp are installed respectively between pertainym edges of the matrix. Preteenie ribs mounted so that after bending each element of the flange in one direction is realized by means of preteenage edges of the flange straightening and bending in p due to intensive alternating alternating bending elements of the flange of the blank during drawing, and also get savings of sheet metal by reducing the size of the workpiece when the hood body parts of complex shape.

The invention is characterized in Fig.1 and 2. In Fig.1 shows a section of a stamp for drawing body parts with pertainym threshold and pertainym ribs, and Fig.2 shows a section of a stamp in the area of the braking elements. Stamp for drawing body parts of complex shape (Fig.2) contains the punch 1, matrix 2 with pertainym threshold 3 in the form of a ledge at the exhaust flange of the matrix and pertainym ribs 4 and the clamp 5 with pertainym ribs 6.

Press double action stamp works as follows. Sheet workpiece is loaded on the clamping surface of the matrix 2. During the course outside of the press slide down the outer part of the workpiece is deformed pertainym threshold 3 and pertainym ribs 4 and 6. At the bottom dead point of the outer slide of the press pertaini threshold 3 and preteenie ribs 4 and 6 form a labyrinth in which bends the flange of the workpiece. Then at the end of the press slide down the Central part of the billet is deformed under the action of the punch 1.

In the process of drawing the peripheral portion of the workpiece is hampered by pulling through the maze, which is bent under the action of the punch 1.

In the process of drawing the peripheral portion of the workpiece is hampered by pulling through the maze formed pertainym threshold 3 and several rows pertainig ribs 4 and 6 by alternating alternating bending and straightening. For this first puritaine rib 6 on the clamp 5 is installed between pertainym threshold 3 matrix 2 and pertainym edge 4 of the matrix 3, and the following preteenie ribs 6 of the clamp 5 are installed respectively between pertainym ribs 4 matrix 2.

Authors conducted theoretical and experimental studies have shown that the magnitude of residual stresses and, accordingly, the springback of stamped parts have a minimum value in the case if the flange billet brake through alternating alternating bending movement of the workpiece through pertaini threshold and one or more rows pertainig ribs installed for pertainym threshold alternately clamp and the matrix.

By reducing the residual stress of the material, and accordingly springback stamped parts increases as the accuracy of body parts. And through the use of preteenage threshold in combination with pertainym ribs, compared with application of N. the earnest of the car.

Claims

Stamp for drawing body parts of complex shape, containing the punch, the matrix pertainym threshold and pertainym ribs and clamp with pertainym ribs, characterized in that the first puritaine edge on the clamp is installed between pertainym threshold matrix and the first pertainym edge of the matrix, and the following preteenie edges of the clamp are installed respectively between pertainym edges of the matrix.



 

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