DE102010007704A1 - Device for processing rotationally symmetric cavity of pressure-resistant component, has clamping tool coupled with drive unit and component is fixed in clamping tool - Google Patents

Abstract

The device (1) has a clamping tool (1.1) coupled with a drive unit (1.2) and a component (2) is fixed in the clamping tool. The drive unit is arranged by which the component is rotatable around an axis (x). A collecting tray is provided, in which grinding medium leaking over work piece openings during rotation is fed. A conveyor element (1.4) is provided for introduction of grinding medium in the cavity (2.1). An independent claim is also included for a method for processing a rotationally symmetric cavity of a pressure-resistant component.

Description

The invention relates to a device for machining a rotationally symmetrical cavity of a pressure-resistant component, wherein an abrasive medium via at least one workpiece opening in the cavity can be filled.

From the EP 1 572 420 B1 is a method and apparatus for machining an edge of a high pressure resistant component, in particular an edge of a bore intersection of a high-pressure-resistant component of a fuel injection system, in which the edge is rounded hydro-erosive in a processing step, known. In this case, before the machining step of the hydro-erosive rounding, the edge and the surfaces of the high-pressure-resistant component adjacent to the edge are each subjected to compressive stress in the region of their surface by means of a grinding and / or honing process.

The invention has for its object to provide an apparatus and a method for processing, in particular for grinding, a rotationally symmetrical cavity of a pressure-resistant component.

The object is achieved in terms of the device according to the invention by the in claim 1 and in terms of the method by the features specified in claim 5. Advantageous developments of the invention are the subject of the dependent claims.

In a device for processing a rotationally symmetrical cavity of a pressure-resistant component, in particular also a high pressure-resistant component, an abrasive medium via at least one workpiece opening in the cavity can be filled. According to the invention, a clamping device coupled to a drive unit is arranged, in which the component can be fixed. In addition, a drive unit is arranged, with which the component is rotatable about at least one axis, wherein a collecting container is provided, in which escaping during rotation over workpiece openings escaping abrasive medium and a conveying element is provided for introducing abrasive medium into the cavity.

By means of the device, it is possible in a particularly advantageous manner to edit hard-to-reach surfaces of the rotationally symmetric cavity of the component, in particular to grind. In such a grinding operation with the aid of the grinding medium, bore burrs at bore edges and / or scaling within the cavity can be eliminated.

By means of the rotational movement of the component in opposite directions carried out via the drive unit, it is possible in a simple manner to produce a relative movement between the grinding medium and the component.

Preferably, the device can be automated so that it can be used in a series production, in particular for the internal cleaning of rotationally symmetrical cavities of pressure-resistant components.

Embodiments of the invention will be explained in more detail with reference to drawings.

Showing:

1 1 is a schematic representation of a device for processing a pressure-resistant component with a rotationally symmetrical cavity in a sectional view;

2 schematically a sectional view of a device for machining, in particular for cleaning, a pressure-resistant component with a rotationally symmetrical shaped cavity, and

3 schematically a sectional view of a pressure-resistant component with a rotationally symmetrical shaped cavity, wherein in the cavity an abrasive medium is introduced.

Corresponding parts are provided in all figures with the same reference numerals.

In the 1 is a schematic device of the invention 1 for machining, in particular for grinding, a component 2 , which has a rotationally symmetrical cavity 2.1 has shown. In this case, the component 2 with respect to its longitudinal axis x on each side S1, S2 an end opening 2.2 . 2.3 on that in the cavity 2.1 empties. In an area of a first opening 2.2 is a cross hole 2.4 into the component 2 introduced through a side wall of the component 2 from the cavity 2.1 to the outside of the component 2 is guided.

In the component 2 For example, it is a part of a fuel injection device of a vehicle, wherein the component 2 can be produced in a forging and / or casting process.

The device 1 for machining, in particular for grinding, an inner contour, ie inner surface I of the cavity 2.1 includes according to 1 a clamping device 1.1 , a drive unit 1.2 , a conduit device 1.3 , a conveyor element 1.4 as well as a collecting container 1.5 , Here are the ingredients 1.1 to 1.5 the device 1 in a housing 3 arranged, wherein a portion of a housing bottom 3.1 as a collecting container 1.5 is formed. For this purpose, the housing bottom 3.1 a funnel-like shape.

In the pressure-resistant, in particular high pressure resistant, component 2 , which can be produced in a forging and / or casting process, arises due to process-related temperatures and / or the contact of material and oxygen used a scaling on an inner surface I of the cavity 2.1 , A resulting layer is undesirable and affects a product quality of the component 2 ,

In addition, during insertion of a component-related bore, in particular transverse bore 2.4 in the cavity 2.1 opens, bore burrs 2.4.1 form at the bore edges. Such a bore ridge 2.4.1 in most cases does not break off from the edge of the hole by itself, and may later on use the component 2 uncontrolled release and thus the use of the component 2 affect.

Should the cavity 2.1 of the generated component 2 be used technically, for example, to the oil guide o. Ä., It must be ensured that no components such. B. Burrs 2.4.1 or tinder from one's cavity 2.1 solve limiting inner surface I. For this purpose, as known from the prior art, an abrasive medium 4 in the cavity 2.1 fillable.

The component 2 with the cavity to be cleaned, in particular to be ground 2.1 is in the jig 1.1 , which has a chuck, for example a three-jaw chuck, can be arranged and fixed in this. In particular, the component 2 with respect to its longitudinal axis x clamped on a first side S1. On one of the clamped side S1 opposite side S2 is the component 2 , For example by means of a roller bearing 1.6 stored horizontally.

The clamping device 1.1 is in a suitable manner with the drive unit 1.2 , which is electrically and / or hydraulically operated, coupled. Preferably, the drive unit comprises 1.2 an engine.

In a particularly advantageous manner, it is provided that by means of the drive unit 1.2 a rotational movement is executable, via the clamping device 1.1 on the component 2 is transferable. The rotational movement in opposite directions, ie clockwise and counterclockwise, executable. Here is the component 2 stored such that the rotational movement of which is freely feasible.

According to the present embodiment according to 1 is the conduit device 1.3 arranged to the abrasive medium 4 the cavity 2.1 supply. In this case, the line device 1.3 mostly outside the case 3 the device 1 arranged. A first line section 1.3.1 the line device 1.3 is in the first opening 2.2 of the component 2 arranged, this up into the cavity 2.1 extends. For example, a nozzle over which the abrasive medium 4 in the cavity 2.1 can be introduced, directed upwards at the first line section 1.3.1 arranged. A second line section 1.3.2 flows into the collecting container 1.5 in which is the abrasive medium 4 located.

In particular, between the first and the second line section 1.3.1 . 1.3.2 the conveying element 1.4 arranged in the form of a feed pump.

In operation of the device 1 becomes the drive unit 1.2 activated, eliminating the drive unit 1.2 executed rotational movement over the jig 1.1 on the component 2 is transmitted, so that this rotates about its longitudinal axis x.

For example, the conveying element 1.4 activated at the same time, reducing the cavity 2.1 of the component 2 in particular via the first line section 1.3.1 the abrasive medium 4 can be fed. Here is the first line section 1.3.1 designed so that after feeding the grinding medium 4 the area of the first line section 1.3.1 in the cavity 2.1 protrudes, over the first opening 2.2 from the component 2 is feasible. In this case, this process is particularly preferably carried out automatically.

The component 2 rotates about its longitudinal axis x by means of the drive unit 1.1 several times, the drive unit 1.2 is controllable so that it accelerates and decelerates according to specification. The abrasive medium 4 , which is a powder, a granulate and / or an emulsion, spreads due to the centrifugal force resulting from the rotational movement on the inner surface I of the cavity 2.1 , Due to a specifiable starting acceleration and braking deceleration, abrasive particles of the grinding medium act 4 an inertia, whereby a relative movement of the abrasive particles to the inner surface I of the cavity 2.1 arises.

With suitable predefinable accelerations and Wiederholvorgängen is advantageously a material removal on the inner surface I of the cavity 2.1 achieved, which Scale residues inside the cavity 2.1 and / or bore burrs 2.4.1 be removed at drill margins.

An at least through the cross hole 2.4 from the cavity 2.1 escaping abrasive medium 4 accumulates due to the funnel shape of the collection container 1.5 , ie the housing bottom 3.1 continuously in this and can by means of the conveying element 1.4 if necessary, beneficial in the cavity 2.1 to be led back.

After the grinding process of the cavity 2.1 can be washed out in this remaining abrasive residue in a conventional washing process. In an advantageous embodiment, the cleaning process takes place in the device 1 , preferably in the clamped state of the component 2 instead of. This is the device 1 fed to another liquid medium, which serves to wash out the abrasive residues. Advantageously, in this washing process, a filter element in the conduit device 1.3 provided to filter out the abrasive residues from the other liquid medium accordingly.

2 shows an alternative embodiment of a device according to the invention 1' for working, in particular for grinding the cavity 2.1 of the component 2 , In particular, in the present embodiment according to 2 the principle of the grinding process shown. It is an alternative to the line device 1.3 according to 1 a funnel 1.7 at and in the first opening 2.2 arranged, by means of which the grinding medium 4 in the cavity 2.1 is introduced.

In the 3 is a sectional view, in particular a cross section of the component 2 with the rotationally symmetric cavity 2.1 shown. It is shown as an example, as the abrasive medium 4 in the cavity 2.1 due to the inertia of the inner surface I rests.

LIST OF REFERENCE NUMBERS

1, 1 '

contraption

1.1

chuck

1.2

drive unit

1.3

conducting device

1.3.1

first line section

1.3.2

second line section

1.4

impeller

1.5

receptacle

1.6

roller bearing

1.7

funnel

2

component

2.1

cavity

2.2

first opening

2.3

second opening

2.4

cross hole

2.4.1

Bohrungsgrat

3

casing

3.1

caseback

4

abrasive media

I

palm

x

longitudinal axis

S1

first page

S2

second page

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1572420 B1 [0002]

Claims (5)

Contraption ( 1 ) for machining a rotationally symmetrical cavity ( 2.1 ) of a pressure-resistant component ( 2 ), wherein an abrasive medium ( 4 ) via at least one workpiece opening ( 2.2 ) in the cavity ( 2.1 ), characterized in that one with a drive unit ( 1.2 ) coupled clamping device ( 1.1 ) is arranged, in which the component ( 2 ) is fixable that a drive unit ( 1.2 ) is arranged, with which the component ( 2 ) is rotatable about at least one axis (x) that a collecting container ( 1.5 ) is provided, in which when rotating over workpiece openings ( 2.2 . 2.3 . 2.4 ) escaping abrasive medium ( 4 ) can be supplied and that a conveying element ( 1.4 ) for introducing abrasive medium ( 4 ) in the cavity ( 2.1 ) is provided. Apparatus according to claim 1, characterized in that means for pressurizing the grinding medium ( 4 ) are provided with pressure, so that the grinding medium ( 4 ) on an inner surface (I) of the cavity (I) 2.1 ) directed into this is einbringbar. Apparatus according to claim 1 or 2, characterized in that the grinding medium ( 4 ) via a line device ( 1.3 ) and / or a funnel ( 1.6 ) in the cavity ( 2.1 ) can be introduced. Device according to one of claims 1 to 3, characterized in that the clamping device ( 1.1 ) comprises a chuck. Method for machining a rotationally symmetrical cavity ( 2.1 ) of a pressure-resistant component ( 2 ), wherein an abrasive medium ( 4 ) via at least one workpiece opening ( 2.2 ) in the cavity ( 2.1 ), characterized in that the component ( 2 ) is fixed, wherein the component ( 2 ) is rotatably mounted about at least one axis (x) and when rotating over workpiece openings ( 2.2 . 2.3 . 2.4 ) escaping abrasive medium ( 4 ) a collecting container ( 1.5 ) and by means of a conveying element ( 1.4 ) in the cavity ( 2.1 ) is introduced.

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