DE3423146A1 - METHOD FOR SHAPING A RING BULB AT THE BOTTOM OF A ONE-PIECE METAL CIRCULAR VESSEL AND LIKE THIS VESSEL - Google Patents

Description

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description

The invention relates to a method for producing a metallic one-piece circumferential vessel with a thick base, which is surrounded by a circumferential ring-shaped collar, which is an integral part of the vessel and is substantially in the extension of the side wall thereof. Such a covenant is generally used as a connecting element and must have very good mechanical properties.

This is particularly the case when the method according to the invention is used to manufacture an engine housing.

It is known to produce vessels with a thick wall by forging or hot or cold drawing, the bottom of which has a has collar formed during forging or drawing.

However, it is difficult to use such vessels with a relatively thick base, relatively thin walls and a large ratio of height to diameter.

The European patent application EP 51121 describes a method to achieve such a result, which consists in the use of a forged blank, its Sidewalls extended with the use of special means to combat eccentricity by roll pressing will. However, performing these sequential operations is very demanding, and it is very difficult to Quality products with optimal dimensional and mechanical properties under economically acceptable conditions achieve.

Attempts have therefore been made to free oneself from the conventional methods by manufacturing vessels using different methods Wise soils obtained with the disadvantage that the federal government can not produce at the same time.

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It is generally known to fasten a collar to the bottom of a metal vessel by suitable fastening means, such as screwing , welding, soldering, banding or the like. However, the connection zone between the collar and the container remains a weak point. In order to achieve sufficient behavior, the connection zone must be reinforced, which calls into question the economy of the entire device.

The object of the invention is to create a way of forming a circumferential collar, which is the bottom of a one-piece Surrounding the vessel and an integral part of it is, and in particular is to provide a way of forming a collar around the bottom of a vessel, the Soil, in turn, was previously formed by pressing the thick wall of a pipe at one of its ends.

This object is achieved according to the invention by the Subject matter of claim 1.

The displacement of the metal is preferably carried out by means of at least one rotating one that is freely rotatable about its axis Roll that on the outer surface of the vessel wall in the junction zone rolls between the bottom and the side wall, applying sufficient pressure to move the metal exercises.

One or more roles are preferably used, each of which is mounted on a roller bearing head, the

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is displaceable at least in two to each other / ACiisen, wherein the displacements of each of these heads by a device with numerical control or controlled numerical control Control are executed.

When using multiple rollers, these are around the axis of rotation of the vessel.

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The pressing can optionally be carried out in one or more consecutive steps Steps.

According to the mechanical properties of the metal or the alloy forming the vessel, pressing is carried out, that enables a cold or warm shaping of the waistband.

After the collar has been formed, the side wall of the vessel can be cold or warm roll-pressed in order to thin it or to extend.

The invention also relates to vessels with a collar formed by moving the metal from the wall. The invention also relates to vessels with a base which is produced by pressing and which is provided with such a collar is.

The invention relates in particular to the use of the method for manufacturing engine housings.

In the following an embodiment of the invention is based on described in the drawing. Show it:

Fig. 1 is a section of a metallic one-piece circumferential vessel which is used for forming a collar on a Mandrel is applied;

Fig. 2 shows the beginning of the formation of the collar around the bottom of the vessel of Fig. 1;

3 shows the end of the formation of the collar.

1 to 3 show schematically a way of carrying out the method for forming a bundle according to the Invention.

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A metallic one-piece vessel 1 with thick walls is placed on a mandrel 2, which is not shown by Means is rotated about its axis 3. The bottom 4 of the vessel is against the front end over its entire surface 5 of the mandrel 2 pressed. The side wall 6 of the mandrel / which is cylindrical in the case of these figures, is with little or substantially small clearance covered by the side wall 14 of the vessel.

A circumferential tailstock tip 7, which is freely rotatable about a common axis 3, is pressed against the bottom of the vessel is stored. The tailstock tip exercises towards one Arrow F from a thrust that creates the bottom 4 at the front end of the mandrel. Two freely rotatable on their axes 10, 11 mounted rollers 8, 9 are located on both sides of the mandrel. Each is carried by a movable head, not shown, which extends in one through two mutually perpendicular Axes X and Y formed plane moves which is parallel to the axis 3 of the mandrel substantially. The heads can also be rotatable about an axis substantially perpendicular to the XY plane in such a way that the angle is changed include the axes 10, 11 of the rollers with the axis 3 of the mandrel.

By a known device with controlled numerical control, the rollers are driven by the heads along the Outer wall of the vessel shifted in the formation zone of the collar and roll on the rotating outer wall; while exerting a given pressure on this, the shifting of the metal along the surface line of the outer wall.

The rollers move along the outer wall 12 of the bottom of the vessel on a helical path, starting from the connection zone 13 of the bottom with the side wall 14, towards the side wall 15 of the tailstock tip 7. The end face 16 of the tailstock tip is firmly attached to the bottom 4, the Shape he takes.

The side wall 15 of the tailstock tip serves as a support for the inner wall of the collar during its formation.

Under these conditions, the metal carried along by the rollers gradually forms a bead that defines the side surface 15 the tailstock tip at least partially covered.

In the case of hard metals or alloys, such as steel, this work is done warm. A heating device is therefore required which brings at least the zone to be processed by the rollers to the desired temperature, and one Means to maintain the temperature for the time required to form the bundle. You can do this a heating by high frequency, by burner or by use any other means.

In the case of steels, e.g. B. of the 32 CD4 variety (French standard) can be ^{heated to temperatures of the order of magnitude of 850 to 900 °} C., for example.

FIG. 2 shows the beginning of the formation of the collar with the formation of an annular bead 17. FIG. 3 shows the collar 15 at of completion. On the three figures are the axes 10, 11 of the rollers shown essentially parallel to axis 3. It can be beneficial to give them an angle of inclination variable relative to this axis during the successive steps performed by the rollers is. The rollers are generally positioned along the axis 3 so that they are offset from one another. 1 to 3 or even more roles can be provided. The device with controlled numerical control allows the execution of the displacement of the rollers in general with successive steps in a perfectly controlled manner Way, which enables the production of a collar whose dimensional properties are fully reproducible.

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After the covenant has been formed, a local or general heat treatment of the vessel. The outer surface and / or the inner surface can also be machined of the vessel take place in such a way that possible surface defects eliminated and the dimensional accuracy increased.

Finally, a warm or cold roll pressing of the side wall can be done 14 of the vessel can be carried out to lengthen or thin the side wall.

It is also possible in the bottom of the vessel, mostly in Near the axis to drill an opening.

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Claims (10)

BEETzYpARTNER 776-36. 372P (36 .373H) June 22, 1984 Steinsdorfstr. 10.8000 Munich 22 1. VALLOUREC SA, Paris, France 2. LUCHAIRE SA, Paris, France Method of forming an annular bead on the bottom of a one-piece metallic circumferential vessel and such a vessel Expectations 1. Method of forming an annular bead at the bottom of a one-piece metallic circumferential vessel, J marked * - by attaching the vessel to one of a drive device twisted revolving mandrel, the front end of which with the entire inner surface of the vessel bottom is in contact and its side wall with little or substantially no play with the inner surface the side wall of the vessel is in contact, - by placing the bottom of the vessel on the mandrel by means of a circumferential and tailstock tip coaxial with the mandrel, the end face of which is part of the outer surface of the vessel bottom covered with the tailstock tip exerting axial thrust in the direction of the mandrel, the side wall the tailstock tip has a maximum diameter that is smaller than the outer diameter of the vessel and is dimensioned to support the inner wall of a collar during manufacture and profiled, and 776-BR 7257 f - by pushing a part of the metal of the vessel side wall into the one adjacent to the bottom annular zone in the direction of the tailstock tip in such a way that an annular elevation is formed, which extends the side wall of the vessel on the side of the tailstock tip and the side wall of the tailstock tip at least partially covered. 2. The method according to claim 1,
characterized, - That the metal is moved by at least one rotating roller which is freely rotatable about its axis and on the outer surface of the vessel wall in the connecting zone rolls between the bottom and the side wall, applying sufficient pressure to move the metal generated. 3. The method according to claim 2,
characterized, - That at least one roller is mounted on a roller support head, which is at least in two mutually perpendicular Axes is movable, and - That the displacements of the roller support head by a Device done with numerical control. 4. The method according to claim 2 or 3,
marked - By using at least two rollers, each of which is mounted on a roller support head and the order the axis of rotation of the vessel are distributed. 5. The method according to any one of claims 1 to 4, characterized in that - that the pressing takes place warm or cold. 6. The method according to any one of claims 1 to 5, 3423H6 characterized, - That the pressing takes place in one or more successive steps. 7. Metallic circumferential one-piece vessel, marked - By a collar (18) formed by a coaxial annular elevation, which forms the side wall of the side of the base is elongated and formed by metal that is displaced starting from this side wall. 8. Vessel according to claim 7, characterized in that - That the bottom of the vessel (4) is a pressed bottom. 9. vessel according to claim 7 or 8, marked - by a side wall (14) thinned by means of roll pressing. 10. Application of the method according to any one of claims 1 to 6 for the production of an engine housing.