DE2620542A1 - DEVICE FOR EXPANSION OF METAL PIPES - Google Patents

Description

Parker Hannifin Rak SA
25 avenue Florissant

O Annemasse (France)

Device for expanding metal pipes

The invention relates to an apparatus for expanding metal pipes ^s.

In practice, one obtains flared ends on the Rohrsn after, one the following procedures:

Before all things one brings the pipe into a corresponding recess a matrix, the recess having a chamfer of the desired V /: r.kels besiezt. The divisions are made using a conical rotating tool carried out.

In such a device, the matrix is held clamped in a clamping device or in a vault. However, in an improved device, m: in also uses a matrix consisting of jaws which are clamped within a bracket and held by a bearing or bearing block within which the rotating expanding tool also rotates.

609883/0282

A third embodiment is practically a combination of the two devices previously described. The jaw matrix rests on the footplate of a bracket, while the mandrel rests on the handle of the hanger is worn.

The three devices mentioned have the essential ^ ch-e-l, that there is no facility to d3S Kohr regarding the circulating Position of the tool. So it can be such eccentric Expansions and expansions of uncontrolled size taffeta red.

Considerable progress is made with a fourth embodiment. In this device, the square matrices rotate around the mandrel, one jaw being relatively movable. The mobility of the jaws is created by girier aocke. The end of the tube goes into the Vorrlcatun :; the .rt-loaded, it d'.SS against a stationary part of the frame pushes .. The jaws moves the tube of this introductory ζ RECOVERY up in a mic the mandrel aligned position. It has been found that even this improved device does not provide the ability to immediately achieve perfectly centered and precisely dimensioned flares. In fact, when the tube is moved sideways, it can move in the direction of its longitudinal axis under the action of the jaw.

In the applicant's French patent application 69 247-31 dated July 31, 1969, published under the number 20 53 839, a device is described and claimed which offers the possibility> ' avoid the above disadvantages and get a perfect alignment of the pipe and the mandrel. In fact, with this device, the pipe cannot experience any axial displacement, as long as it is not held tightly by the necks.

609883/0282

The device for expanding has a base, two brackets for getting the pipe to be formed, at least one of which is relative the other is movable, a mandrel to carry out the expansion, Means for moving the mandrel in the direction of the pipe held by the jaws and a movable stop which is in reads its one position between the end of the tube and the mandrel.

The patent application mentioned describes in particular a device of the above type, in which the movable stop by one horizontal axis running parallel to the piston axis can be swiveled is and is controlled by means of a manually operated lever. A hydraulic or pneumatic piston working machine advances the thorn.

Such a device has the same disadvantage as any manual device. It is not only a g-nz special "> ufmerksairJkeit of operators required but there is. Cloth not the possibility of a rapid sequence of steps to ensure due to the Titsache that the individual manual labor iblaufe are independently *

The present invention relates to a device for expanding: the pipes, in which all of the following, successive work steps are subject to control by the advance of the mandrel, namely: preloading the pipe in the jaws, moving the positioning stop for the pipe, dn & clamping of the tube by the return stroke of the conical or prismatic jaws within a recess of complementary shape and the actual expansion process. '■! ■ :. ϊ · ■ \. '

Further advantages and features of the invention result from: following description of a preferred embodiment in

OFUQlNAL INSPECTED

6 09883/0282

- if -

Relation to the accompanying drawing. The drawing shows in;

Fig. 1 is a sectional side view of a device according to the Invention;

Fig. 2 is a plan view along the line I - I in Fig. 1;

Fig. 3 and 1+ partial views for the individual positions of the mandrel during the advance.

According to the embodiment, the device has a body 1, which is preferably designed as a one-piece block. The body has two coaxial, merging recesses 2 and 3, The recess 2 forms a cylinder for a hydraulic piston work machine. A piston, which is connected to a conical mandrel 5, moves inside the cylinder. The recess 3 is of prismatic shape with its side walls below are inclined at an angle of 12 relative to the vertical plane. These Recess is open in the upper and in the rear area. However, the upper opening can be covered by means of a bracket 6. The latter can be pivoted about an axis 7.

In the interior of this recess, two jaws 8a and 8b become one Vice or a clamping device 8 inserted manually. The 'i' interfaces of the jaws are aligned vertically. The cheeks are arranged so that they can be moved so that they can be replaced. Everyone The set is adapted to the diameter of the pipe to be expanded. In particular, the front surfaces of the jaws have a chamfer 8c, which forms a matrix.

The outer shape of the jaws is complementary to the shape of the recess 3 trained.

809883/0 28 2

In the front part of the recess 3 there is a plate 9 which is connected to a lever 11 via a pivot point 10. The latter is in turn hinged to the body 1. A spring 12 keeps the lever 11 in contact with the body 1.

The inner section of the plate 9 has a chamfer 9a which cooperates determine dean urnes with at least one of the generators is. The plate 9 is used in the lag stop shown in FIG on the one hand for the jaws 8a, 8b and on the other hand for the end of the pipe to be expanded. V,

The hydraulic piston working machine 2, 1+ is designed to be single-acting and is used to bring the mandrel 5 closer to the Mr.trix 8c. Springs 13 lead the piston back in the opposite direction.

The device works in the following way. In egg rest position According to FIG. 1, the mandrel 5 assumes its retracted length. The Bakken 8a, 8b, the diameter of which is adapted to the pipe to be expanded have been manually logged into recess 3. The plate 9 takes its position between the recesses under the action of the spring 12 2 and .5 and rests on the open outer end of the recess 2 from. The tube to be expanded is manually eln.ireführ between the jaws 8a and 8b, in such a way that the jaws including of the tube come to rest on the plate 9.

Then you close the bracket 6 and set the piston work machine in operation.

When the conical mandrel hits the plate 9, it pushes it back and consequently displaces both the jaws 8a, 8b and the tube. The latter move in a straight line, while the plate 9 with respect to of the pivot point 10 tends.

Due to the complementary prismatic shape of the vice 8 and the recess 3, the sliding movement leads to the fact that the Bak-

609883/0282

ken 8a and 8b move against each other and consequently d.-as held by them Clamp the pipe.

When the plate has swiveled in such a way that it has a chamfer for of the bracket 6, the chamfer 9a, which interacts with the generating line of the mandrel, takes on the function of a cam. the Plate shifts as it rises. The lever 11 is moved against the action of the spring 12.

Continuing the movement of the mandrel leads to deformation of the pipe and its expansion.

When the pressure is released, the springs 13 push the piston 4 return. The plate moves progressively back to its starting position.

The prism angle is chosen with the proviso that no jamming occur κ-tnn. So if you open the bracket 6, you can Loosen the engagement between the socks and the tube.

According to the invention, a completely automated mode of operation is made possible, from the point in time at which the tube is gripped in v / -secure and the movement of the piston L · and its mandrel 5 in the direction of the arrow P begins.

ORIGINAL-INSPECTED

609883/0282

Claims (1)

PATENT CLAIMS ! ./ Device for expanding metal pipes with a body that a clamping device consisting of two jaws for holding the pipe to be expanded, a movable stop for positioning of the pipe, contains a conical mandrel coaxial with the pipe and means for displacing the mandrel along the common axis, marked by a direct or indirect attack of the mandrel (5) on the jaws (8a, 8b) to achieve their mutual approach. 2. Apparatus according to claim 1, ■ dHQ marked by that the two jaws (8a, 8b) have a substantially angled (conical or prismatic) shape and are axially displaceable in the interior of a recess (3) of complementary shape in such a way that that this axial displacement is limited to a feed of a predetermined length caused by the mandrel. 3. Vorricntu. ". ^ N'.ch claim 2,
dr durcri. ^ indicates d'ß the lieip; un? angle of the angular form 10 to 15 °> based on d: e feed axis. if. Device n; I claim 3>
d marked by,
d-ß the angle of inclination is 12. 5. Device n - ch one of claims 1 to if, thereby marked? i chn-? t, d:; ß the movable stop wakes a plate (9), which between the mandrel (5) una the bags (8a, 8b) is arranged and to the last ren rests on both sides of the horizontal parting plane in such a way that it prevents the mandrel from being displaced until the maximum Transferring movement to the jaws. 609883/0282 -Z- 6 «Device according to claim 5, characterized in that the plate (9) is bevelled in its lower area along a chamfer (9a), this start cooperating with at least one generatrix of the mandrel (5) ⁴ ; 7. Device n ^ ch one of claims 1 to 6, characterized in that the stop is formed by the plate (9) 'which ηη its upper end is hinged to a lever (11) such that it can assume different angular positions with respect to the lever. 8. Apparatus according to claim 7, characterized in that the lever (11) is articulated with its other end on the body (1) is and is under the action of a spring (12). 9. Apparatus according to claim 7 or 8, characterized in that the body (1) or a movable one connected to the body Element (6) carries a stationary stop (6ε) which limits the angular movement of the plate (9) and forms a ramp, along which the plate slides as it moves upward under the action of the advance of the mandrel (5). 10. Device according to one of claims 1 to 9, characterized in that that the mandrel (5) with a single-acting piston work machine (2), (Zf) is connected, which can be actuated against return springs (13) in a direction that corresponds to the entry into the pipe is. 609883/0282 Blank page