RU26979U1 - STAMP FOR FLEX OF THE FRONT AND REAR LINING OF CAR BUMPERS - Google Patents

Description

2002121434

 tiBiiiiipppep about. ,,.) MPKV2Sh22 / 02

STAMP FOR FLEX OF THE FRONT AND REAR LINING OF CAR BUMPERS

The invention relates to the processing of metals by pressure and can be used in the manufacture of parts with different radii of curvature from sheet blanks, in particular, decorative bumper pads for a car.

Currently, in automobile plants, bending of parts with different radius of curvature is carried out on separate dies. In this case, the punch and the matrix have one working surface, the radius of curvature of which is equal to the radius of curvature of a particular manufactured part.

The disadvantage of this strain is that for the manufacture of two parts of different lengths and different radii of curvature, two stamps have to be used, which increases the labor intensity and metal consumption by 2 times, which means that the cost of the product itself increases.

Closest to the proposed is a stamp for bending in the manufacture of convex parts of double curvature from oval sheet blanks, containing a matrix and a punch with curved working surfaces corresponding to the shape of the part. The calculation formula is used in the stamp to determine the shape of the working surfaces, taking into account springing, which allows to increase the accuracy of parts, as well as to simplify the design of the stamp and reduce the cost of its manufacture. The matrix and punch are cylindrical. The radius of curvature of the working surfaces in various sections parallel to the axis of the cylinder (RF patent 2053035 IPC B21D7 / 06, B21D22 / 02).

The disadvantage of this device is the inability to simultaneously bend two parts with different radii of curvature.

The objective of the proposed device is to enable the simultaneous manufacture of two parts with different radii of curvature on one stamp.

The problem is achieved in that in the stamp for bending the front and rear pads of automobile bumpers, including a punch and a matrix with curved working surfaces, according to the proposed solution, the punch and the matrix have two working surfaces, for example, one of the working surfaces of the punch and the matrix has a radius of curvature equal to the radius of curvature of the front lining, and the second working surface is the radius of curvature equal to the radius of curvature of the rear lining.

The device is illustrated by drawings. In FigL presents a sketch of the workpiece and the first part - lining the rear bumper, Fig.2 - sketch of the workpiece and the second part of the lining of the front bumper, Fig.Z - punch, top view, Fig. 4. - punch, side view, Fig. 5 - matrix, top view, Fig. 6 - matrix, side view, where:

1- blank rear bumper trim

2- rear bumper trim

3- blank for the front bumper

4- front bumper trim 5-punch

6-matrix

7- working surface of the punch and die with radius RI

8- working surface of the punch and the matrix with a radius of R2 RI - radius of curvature of the workpiece for the rear bumper trim R2 - radius of curvature of the workpiece for the front bumper trim

The stamp includes a punch 5 located on the upper plate (not shown in the drawing), a die 6 with an ejector located on the lower plate (not shown in the drawing). The punch 5 and the matrix 6 have two working surfaces 7 and 8, made with predetermined radii of curvature RI and R2, corresponding to the radii of curvature of the blanks of the decorative plates (front 4 and rear 2) of the car bumpers. The blanks 1.3 are in the form of a saber plate. The stamp contains columns and bushings (not shown in the drawing) located in the lower and upper plates, respectively, providing a working stroke of the upper plate. On the ejector from the side of the working surface of the punch mounted l-shaped stops (not shown) to fix the position of the workpieces. The height of the stops is equal to the thickness of the workpieces. The stops are placed in pairs on opposite sides of the ejector surface.

The device operates as follows.

A matrix 6 with two working surfaces 7 and 8, each of which has a different predetermined radius of curvature RI and Ra, is placed on the bottom plate of the stamp. At the same time, the blanks of two parts 1 and 3 with their radius of curvature RI and R2 are placed on the ejector of the matrix 6 between the L-shaped stops, which fix the position of the blanks during their bending. After lowering the top plate, on which there is a bending punch 5, also having two working surfaces 7 and 8 with the given radii of curvature RI and Ra, the edges (surfaces) of both workpieces are radially bent, forming two finished parts 2 and 4. After exiting

the punch 5 of the matrix 6 is triggered by the ejector, which displays the finished part from the matrix for its removal and storage in the drive.

The proposed strain is intended for serial production of decorative front and rear pads for automobile bumpers. The proposed solution increases productivity and reduces the cost of finished products.

Claims (1)

A stamp for bending the front and rear pads of automobile bumpers, including a punch and a matrix with curved working surfaces, characterized in that the punch and matrix have two working surfaces, while one of the working surfaces of the punch and matrix has a radius of curvature equal to the radius of curvature of the front pads, and the second working surface is the radius of curvature equal to the radius of curvature of the back plate.