DE102004018465A1 - Material guide bushing, has upper chambers connected with one another and adjust themselves to system equilibrium, even if guide jaw is far distant from center, such that radial strength is ascertained with pressure in chamber - Google Patents

Abstract

The bushing comprises of upper chambers that are connected with one another and adjust themselves to system equilibrium, even if a guide jaw is far distant from the center, such that the radial strength is ascertained with the pressure in the upper chamber. The material guide bushing is movable individually and independently in radial direction, such that each jaw is individually attached to a material bar.

Description

Operation:

On the Inlet is in the outer ring cavity oil or other, used in the machine coolant Pressed in with high pressure.

About the Holes on the guide ring the liquid passes in the upper chamber between guide ring and guide jaws. There, a pressure builds on the guide jaws on the leading rod material suppressed.

By the oblique Gap between guide ring and guide jaws now the liquid is flowing off, and get over inner ring cavity depressurized from the system.

That the guide jaws be due to the fluid pressure in the upper chamber over the guide jaws pressed on the bar material. You can to adapt to the material variations, since they are in the radial direction are mobile.

The Height of Pressure is crucial for the Contact pressure of the guide jaws. The gap size has influence on the pressure drop and thus on the flow rate.

Becomes the material is now thinner or thicker or is out of round, can the guide jaws dodge.

Becomes now a guide baking pushed back by the bar material, the gap is smaller, and thus increased the pressure in the upper chamber between guide ring and guide jaws.

This As a result, the guide jaws stronger again as the other jaws are pushed inward, and so will that Material always optimal and best possible guided centrally. This compensates tolerance variations of the material.

at Operation, a balance of the guide jaws with pressure the material bar, since the liquid the guide jaws pushes towards the center for as long as until all guide jaws at Material abut.

Consequently it follows that the material (centric for round bars) stuck guided becomes.

Changes the material diameter, the guide jaws adapt to the material, because of the construction a new system balance of all cheeks to each other. What can change is the flow rate or pressure in the upper chamber.

Becomes the pressure kept constant, the clamping force remains constant, apart from viscous static-dynamic influences. Only the volume flow becomes larger or smaller, yes after the material gets thinner or thicker.

Becomes the leading one Material becomes larger the gap / flow. At the same pressure remains the contact pressure of the jaws is the same.

Of the Volume flow increases.

Becomes As the material thickens, the gap / flow becomes smaller. At the same Pressure remains the same as the contact pressure of the jaws.

Of the Volume flow becomes smaller.

is a non-circular rod, each guide jaws in the system best position. This is due to the fact that the system, here the liquid, always seeking the maximum flow.

rotates the non-round rod goes every single turn guide jaws a certain way in the radial direction back and forth.

at exactly one revolution then all guide jaws are back in their Starting position.

Variant:

By Holes through the guide jaws enters a part of the lubricating fluid directly on the material bar, where it forms a sliding layer, and at the same time a slight back pressure, which is a hydrodynamic Storage is about to come.

These guide bush can be executed either as fixed or running variant.

Parameters that influence:

The managerial and or span properties parameters such as viscosity, Bore sizes, gap size, gap angle and height.

at appropriate variation can here an optimal automatically adjustable Guide bush constructed become.

ever After printing, the material is held differently strong.

Yes according to angle and size of the column arise other reaction parameters of the guide jaws.

Drawings:

1 Shows the entire guide bushing assembled. The rod to be guided is also indicated.

2 Is the exploded view of the guide bush. Here one can see well the punctures in the lid, where in the outer groove, the liquid is pumped in and can drain in the inner groove, after it has flowed through the guide ring, and past the cheeks.

3 Shows the top view without the top lid. Here is good to see the position of the guide jaws and their direction of movement. The gap between the guide jaws and guide ring is very small and therefore hardly recognizable.

4 Shows a section of the guide ring, without the other components.

Here It is good to see the holes through which the liquid from the outer cavity through the guide ring gets into the upper chamber.

Claims (2)

guide bushings serve to guide of material when machining on long lathes. Current state of the art are guide bushings: 1 fixed guide bushings are pods, often made of carbide. To lead of the rod material is a game, small gap, and lubrication necessary, so that the bar material does not get stuck. This game is however undesirable, because it causes inaccuracies in manufacturing. 2 roller bushes: are comparable to roller bearing concept. The material is guided comparable with a stored shaft. 3 revolving guide bushings. Are built like "spanzangen" and run synchronously with the main spindle. Allen guide bush designs in common is that they do not respond to varying or varying material diameters can move. You can, if the material is thinner will not adapt, and if it thickens will not widen. Then play arises, or it jams, between rod material and Guide bush, what about the quality of rotation and manufacturing tolerance. Although there are adjustable Guide bushings, which can react to fluctuating material diameters, the However, in construction and control are very expensive, and only partially compensate for the tolerance variations of the rod material. The Invention is characterized in that rod material with fluctuating Diameter to be used, and still always the optimal guide to ensure the bar material is. Furthermore, the claim is justified in that it is possible with this guide bush non-circular, non-bright, diameter-fluctuating materials etc. firmly to lead. Of Furthermore, the invention is then justified that the clamping or application pressure the guide jaws arbitrary changed can be. This is over here the pressure change possible. Of the Claim is characterized in that each guide jaws individually and independently in Radial direction is movable. Thus, each individual can Create jaws individually on the material bar. The radial force is determined by the pressure in the upper chamber. Because the upper chambers connected with each other is always a system balance one, even if the guide jaws are far different from the center.