DE102004039364B3 - Surface treatment process directs stream of abrasive material at a first surface from which it rebounds onto a second surface - Google Patents

Abstract

A process stabilises and strengthens a surface (7) embedded in a hollow metal profile (1). In the process a surface treatment agent impinges on the surface with high kinetic energy. The agent is directed as a primary stream (11) against a first surface (8) from which it rebounds to arrive as a secondary stream (13) at the treatment zone (7).

Description

The The invention relates to a method for solidifying in metallic Hollow profiles trained surfaces according to the features in the preamble of claim 1.

It counts to State of the art, the life of components subject to vibration, such as. Springs and torsion bars, to increase by the solidification blasting. With the help of solidification blasting be u.a. by deformation or by heat in the surface of a Component introduced tensile stresses in defined compressive stresses transformed. Also can minor surface defects, such as scratches or caused by a deformation slight impressions, overshadowed so that these surface defects are no longer available.

A A variant of the solidification jet is compressed air blasting. This is mostly used to clean surfaces inside components, in particular of pipes, e.g. Torsion profiles in vehicle construction, to radiate. Problematic with the compressed air blasting of such hollow profiles is, however, that to radiating surfaces often fig can not be achieved. This is the case if there are gaps too small for compressed air blasting used jet pipes are dimensioned. Also is the compressed air blasting a high compressed air consumption unavoidable. The jet pipes have to also very small in diameter (usually smaller than 12 mm in diameter) and in length be very long (at least about 300 mm). Subject to these dimensions the jet pipes a big one Wear with resulting process dispersion. This has a negative effect on the life and the introduced compressive stresses. Of Furthermore, the process reliability is not given in sufficient form, because the jets are not always aimed specifically at the surfaces to be radiated can be. Further is due to the nozzle geometries the jet pipes the kinetic energy of the blasting media (steel or Ceramic balls) not sufficiently high.

At the Solidification jets from outer surfaces becomes usually the variant of turbine or blast wheel applied. Although this method also reaches the inner rays used by pipes, but only if the blasting agents without problems can escape in the beam direction. Here, the blasting agents are introduced centrally into a blast wheel, then the abrasive on the circumference over a certain exit sector with high kinetic energy on the surfaces to be solidified hurls.

From the DE 35 27 923 C2 is a shot peening nozzle for solidifying the wall of a bore in a metallic workpiece by shot peening by means of balls known. The shot peening nozzle has an impact surface which forms an angle of less than 45 ° with the tube axis. This type of shot blasting nozzle is only suitable for use in drilling and specially adapted to this application.

Of the Invention is - starting from the prior art - the Task, a method for solidification in metallic Hollow profiles trained surfaces to create, in which also hard to reach surfaces can be properly solidified by blast wheel.

These The object is achieved with the features specified in claim 1.

in the With regard to the facts that often cause radiant surfaces, in particular inside torsion profiles, in particular of steel or aluminum, can not be reached by direct irradiation or the impact angle is too small in relation to the ideal impact angle of 90 °, makes the Invention the so-called secondary beam when Take advantage of blast wheels. This means that the blasting media (steel or ceramic balls) are first in a primary beam flung against a surface opposite a surface to be solidified, from which the blasting agents are reflected and then as possible little from 90 ° to surface to be consolidated deviate from the angle to the surface to be consolidated. By this indirect rays can so also surfaces be achieved, the very narrow column limit and not directly to be irradiated.

There the blasting agents with a very high kinetic energy in the respective hollow profile can be introduced, this can not clog. Rather, they fly independently again from the hollow profile.

at extremely difficult to access surfaces it may be appropriate according to the features of claim 2, that the blasting agents are to be solidified before being impacted Surface twice on inner surfaces be deflected the hollow profile. It is sort of a zigzag guide the blasting agent at a comparatively shallow angle to the distracting surfaces.

Since curved surfaces are to be solidified in a hollow profile, it is entspre Chend claim 3 of advantage that the hollow profile is spatially displaced during spin-blasting. This can be done by turning or tilting the hollow profile. In this way, the hollow profile is not exposed to the blasting agents in a constant position. The displacement of the hollow profile can be done for example by robots. In this case, the blasting process, ie the angles, the positions and the blasting times as well as the intensity and the blasting agents used in each case are to be developed correspondingly to the respective hollow profile to be blasted.

One Impeller can be used according to the features of claim 4 be, simultaneously several juxtaposed hollow sections to radiate. These hollow profiles are, as far as they have curved surfaces, then during the Radiating preferably spatially relocated, so that all desired surface areas properly solidified.

Should at the same time several hollow profiles using a blast wheel irradiated, it may be expedient according to claim 5, the hollow profiles continuously to lead past the blast wheel.

Conceivable is according to the characteristics of claim 6 but also a clocked vorbebeiführung the hollow sections of the Spinning wheel.

Especially It is advantageous if the method according to the invention in Torsionsprofilen used in vehicle construction, in which the end sections a possess round or oval hollow cross section and the length sections formed between the end portions by radial deformation U- or V-shaped are. In this case, in the transition areas between the completely deformed U- or V-shaped middle lengths and the tubular End portions of the end sections outgoing, steadily narrowing crescent Column available. Here, in particular by twice deflecting the blasting agents, including the surface areas can be achieved, which abut almost on the opposite surface.

The Invention is described below with reference to the drawings embodiments explained in more detail. It demonstrate:

1 in perspective, an end portion of a torsion profile for the motor vehicle construction;

2 a vertical longitudinal section through the representation of 1 seen along the line II-II in the direction of arrows IIa;

3 a vertical cross section through the representation of 2 along the line IIII-III seen in the direction of the arrows IIIa;

4 a vertical cross section through the representation of 2 seen along the line IV-IV in the direction of arrows IVa;

5 a vertical cross section through the representation of 2 seen along the line VV in the direction of the arrows Va;

6 a vertical cross section through the representation of 2 seen along the line VI-VI in the direction of arrows VIa;

7 in the diagram the representation of the 2 in combination with a blast wheel and

8th in a schematic plan view of several adjacent torsion profiles together with a blast wheel.

In the 1 and 2 is with 1 denotes a longitudinal region of a hollow profile in the form of a torsion profile for the rear axle of a motor vehicle. The hollow profile 1 comprises two round hollow end sections 2 and one between the end sections 2 caused by radial pressing, double-layered in cross-section U-shaped longitudinal portion 3 , Between the U-shaped length section 3 (see also 2 and 3 ), in which inner surfaces 4 . 5 of the hollow profile 1 lie against each other, and the round end sections 2 ( 6 ) transition sections extend 6 in which the distances between opposing inner surfaces 7 . 8th from the round end sections 2 starting in the direction of the middle U-shaped longitudinal section 3 steadily smaller, so that crescent-shaped column 9 result.

In practice, it is desired, at least the surfaces 7 the transitional sections 6 to solidify.

With regard to the facts that the column 9 between the surfaces to be consolidated 7 and the mating surfaces 8th getting tighter and narrower, the blast wheel is used. In the blasting ( 7 ) blasting agents in the form of steel or ceramic balls are a blast wheel 10 fed centrally and from the blast wheel 10 circumferentially over a specific sector S (see also 8th ) thrown off.

In the 7 is a blasting agent containing primary beam 11 clarified. This primary beam 11 first meets a surface 12 in the round end section 2 of the hollow profile 1 , Here the blasting agents are deflected and arrive in one second därstrahl 13 on the surface to be solidified 7 opposite surface 8th , From here they are deflected again and on the surface to be solidified 7 spun.

It can be seen that this way also the narrowest area in the crescent-shaped gap 9 between the surface to be solidified 7 and the opposite surface 8th can still be charged with the blasting agents.

There, like that 4 and 5 to reveal the surface to be solidified 7 not only in the longitudinal direction of the hollow profile 1 but is also convexly curved in the transverse direction, becomes the hollow profile during the blast wheel 1 spatially, in particular by an unspecified robot, so that shifts the secondary beam 13 with the blasting abrasives in an angle that is only slightly different from 90 ° to the surface to be solidified 7 meets.

The 8th illustrates an embodiment in which a plurality of juxtaposed hollow profiles 1 according to 1 on a blower wheel 10 be led over to those from the 2 . 4 . 5 and 7 recognizable interior surfaces 7 in the transitional sections 6 be able to solidify by means of blast wheels.

Again, the hollow sections 1 during the relative movement to the blast wheel 10 spatially displaced so that all sections of the surfaces to be solidified 7 also be achieved by the blasting agents.

The passing of the hollow sections 1 at the blower wheel 10 can be continuous or intermittent.

1

hollow profile

2

End sections v. 1

3

middle section v. 1

4

Surface v. 1

5

Surface v. 1

6

Transition sections

7

Surface v. 6

8th

Surface v. 6

9

column

10

blower

11

primary beam

12

Surface in 2

13

secondary beam

S

sector

Claims (6)

Method for solidification in metallic hollow profiles ( 1 ) trained surfaces ( 7 ), in which the surfaces ( 7 ) are exposed to a high kinetic energy having blasting agents, characterized in that the blasting agent is first in a primary beam ( 11 ) against a surface to be solidified ( 7 ) opposite surface ( 8th ) and then from this surface ( 8th ) in a secondary beam ( 13 ) on the surface to be solidified ( 7 ) to get distracted. A method according to claim 1, characterized in that the blasting agent before the impact on the surface to be solidified ( 7 ) twice on internal surfaces ( 12 . 8th ) of the hollow profile ( 1 ) to get distracted. Method according to claim 1 or 2, characterized in that the hollow profile ( 1 ) is spatially displaced during irradiation. Method according to one of claims 1 to 3, characterized in that using a blast wheel ( 10 ) several juxtaposed hollow profiles ( 1 ) simultaneously with respect to inner surfaces to be consolidated ( 7 ) are irradiated. Method according to claim 4, characterized in that the hollow profiles ( 1 ) continuously on the blower wheel ( 10 ) are passed by. Method according to claim 4, characterized in that the hollow profiles ( 1 ) clocked on the blower wheel ( 10 ) are passed by.