SU1733158A1 - Method of straightening workpieces - Google Patents

Abstract

Use: edit various products, including ship welding structures. SUMMARY OF THE INVENTION: The product is placed on two supports, after which it is bent by a static load applied through an elastic connection and the effect by a vibration load. When bending with a static load, a bending stress is created equal to the difference in stress of the yield strength of the material of the workpiece during vibration, and the bending stress created by the vibration load. The application of a load through elastic coupling reduces the power of the vibrator necessary to achieve resonant frequencies, in turn reducing the yield strength of the workpiece material when exposed to vibration reduces the required amount of static load. 2 sludge. Yo

Description

The invention relates to the technology of manufacturing ship hull structures and can also be used in other areas of mechanical engineering.

The purpose of the invention is to improve the efficiency and quality of edits.

Fig. 1 shows a device that implements a method of product editing using a single working unit for bending; Figure 2 is the same, using two nodes.

The method of dressing products is as follows.

The product 1 is laid on two supports 2, after which it is bent by one or two static forces 3, which are connected elastically with the product and the picker 4 placed on the platform 5.

The transfer of static load is carried out at two points located symmetrically with respect to the supports. After switching on the sources of vibration, the product is corrected by adding the bending stresses from static and vibration loads.

Bending is carried out by one or two static forces applied to the product through shock absorbers 6, due to which sources of forces are applied. Do not fluctuate with the product. This allows the product to oscillate at frequencies close to its resonance, which is necessary to increase the efficiency of the process, and use less powerful vibrators, as well as to eliminate the load in the direction opposite to the required direction of application of force, because By design, the inertial load would arise not only downwards but also upwards, bending the structure in the direction of increasing the initial deformations.

When straightening a bend only under pressure or with a load, it is necessary to create a stress in the structure equal to the yield strength of the material. This requires great effort.

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In the process of vibrating the structure, additional stresses are created in it, which are added to the bending stresses by the load. It is known that, during vibration, the yield strength of a material can be almost halved; as a result, during vibration, the plastic flow of a material occurs at total stresses (from bending and vibration) less than their yield strength. Therefore, to achieve effective straightening, it is sufficient to create with a concentrated mass a flexural stress equal to the difference in the yield stress of the material during vibration and the flexural stress created by the vibration load, which for various materials will be 0.3-0.6 stress yield stress for static loading conditions.

Vibration effect on the product can be made not only by a mechanical vibrator, but also by ultrasound or pulse.

Claims (1)

The method makes it possible to eliminate large deformations in the articles without the appearance of cracks 5 and damage. In this case, the editing is carried out with relatively little effort. Claims The method of straightening products, including placing the product on a support, bending it with a static load in the direction opposite to the original curvature, and additional exposure to it with a vibration load, characterized in that, in order to improve efficiency and , a static load is applied to the product through an elastic bond with a value that ensures in the workpiece a static bending stress equal to the difference in the yield stress 20 of the workpiece material during vibration and bending stress a generated by vibration load. Јw. / FIG. g