DE7614723U1 - DEVICE FOR EXPANSION OF METAL PIPES - Google Patents

Description

Parker Hannifin RaJt SA
25 avenue Florissant

O Annemasse (France)

Device for expanding metal pipes

The invention relates to a device for processing metal *

In practice, flared ends are achieved on the tubes after a the following procedures:

Before -illen things one brings the pipe into a corresponding recess a matrix, the recess having a chamfer of the desired angle. Di.s widening is done using a "*! Conical urr.laufcen .. ^ rrizeuis άurcnsre leads.

In the case of a device such as this, the matrix is held in a clamping device or in eirerr! Substock held wedged. However, • v ° nds In one improved device, there is also a matrix that consists of cheeks, which are clamped within a bracket and held by a lag-er or larerblock, within it In addition, the revolving expansion tool rotates.

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A third embodiment practically represents 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 major disadvantage that there is no means to position the tube with respect to the rotating tool. So it can also be eccentric Expansions and expansions of uncontrolled size occur.

A significant advance is made with a fourth embodiment. In this device, the jaw-shaped matrices rotate around the mandrel, one jaw relative to the other is movable. The mobility of the jaw is caused by a cam. The end of the tube goes into the device like this inserted that it abuts against a stationary part of the frame.

exile niii / dem uvi'ii iiucjii / euuc ruan-xuii. £ <a wux'uc gciuiiucu, ΰο.υ acxubu this improved device does not offer the possibility of achieving perfectly centered and precisely dimensioned expansions right away. In fact, when the tube is laterally displaced, 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, becomes a Device described and claimed, which offers the possibility of avoiding the above-mentioned disadvantages and a perfect alignment of the tube and the mandrel. Indeed can

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With this device, the tube will not experience any axial displacement as long as it is not held firmly by the jaws.

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The device for expanding has an eiron socket, two p-.cker. for getting the pipe to be formed, of which mind-rs'.ens eir <^ r relative to the rr.of which can be moved, a mandrel to carry out the. \ ufweitunf, Means for moving the dome in the direction of d ^ s of the tube held in the corners and a movable Ar.scnl- /? its one position between the end of the tube and the mandrel located.

Said patent application particularly describes e'ne device of the foregoing type in which the beweffb're Conn'S "to eir.e horizontal, running parallel to the piston axis axis * ¹ kb sch'.ve ^ r and is controlled by means of a manually operable lever A hydraulic or pneumatic piston work machine moves the mandrel.

Such a device has the same disadvantage v / ip? Ämtlicne manual devices. It's not just a very special "attention." of the operating personnel, but there is also no possibility of ensuring a quick sequence of work steps, due to the fact that the individual numerical workflows are independent of each other.

The present invention relates to a device for expanding the tubes, in which all of the following, successive The work steps are subject to control by the feed of the mandrel, namely: the pre-clamping of the pipe in the jaws, the movement of the positioning stop for the pipe, the clamping of the pipe by the return stroke of the conical or prismatic 3akken within a recess of complementary shape and the actual Expansion process.

Further advantages and features of the invention emerge from the following description of a preferred exemplary embodiment in FIG

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Zus immenhr.n; - with the accompanying drawing. The drawing shows in:

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

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

Fl ";. 3 and L partial views for the individual positions of the mandrel during the advance.

According to the exemplary 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 -'Uf Die Ausnehr ·.;. '^? forms a cylinder for a hydraulic piston working machine. Shipment-lb of the cylinder piston moves em k> Ger is connected to a conical mandrel. 5 The recess ¹ 5 is of prismatic shape, its side walls are inclined at an angle of 12 ° with respect to the vertical plane. This recess is open in the upper and in the back 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 brackets 8a and 8b become one Vice or a clamping device 8 inserted manually. The parting surfaces of the jaws are aligned vertically. The cheeks si-id arranged to be movable in such a way that they can be exchanged, oeder S ^ "ζ 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.

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In the front part of the recess 3 there is a plate 9 ₃ which is connected to a lever 11 via a pivot point IO. Leta- 'terer is in turn articulated on 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 determined with at least one of the creators of the dome ict. The plauze 9 serves as a stop in the position shown in FIG on the one hand for the jaws 8a, 8b and on the other hand for the end of the to be expanded Pipe.

The hydraulic piston working machine 2, i \. is single-acting and is used to approximate the dome 5 ^? n the matrix 8 c. Springs 15 lead the piston back in the opposite direction.

The device functions in the following way. In the rest τ division n ^ ch Fi g ;. 1 r. irjni egg thorn 5 its retracted position. The bakk "T. Rta, Sb, cue in i ^ .rem diameter τη d * s to be expanded tube rr -. ^ E p - .. ßs are, were inserted manually into the recess 3. D - '. E plate take ur; The spring 12 is in its position between the outer dimensions 2 and 3 * '· ■ η and is supported on the open rear end of the recess: nF 2. The pipe to be expanded is manually zv / ischen the jaws 8-: and 8b elr.-efuhrc, in such a way that the jaws including the tube come to rest on the plate 9.

Then mcr. the bracket 6 and sets the piston working machine

IVonr; the conical ..nr: i uf d ^"5 e plate 9 triff-, s-.öß; he aiese back | u" i * Move fol ^r 'cn. sowoni the jaws 6a, 8b, rls; uch to the tube. Le: ζ-ere be we re.η SxCii rr ailnig, v / while sicn ci.e plate '-j with respect to | des ochv / enkpunktes 10 r.oig "..

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

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ken. 8a and 8b migrate towards each other and consequently what they hold Clamp the pipe.

When the plate has pivoted such that it reaches a Anfasimg 6a of the bracket 6, takes over the chamfer 9a with the generatrix of the _mandrel-s cooperates the function of a Wocke. The plate shifts as it rises. The lever 11 is moved against the action of the spring 12.

A continuation of the movement of the dome leads to a deformation of the pipe and its expansion.

When the pressure is released, the springs Iy push the piston k back. The plate moves progressively back to its starting position.

The prism angle is chosen with the proviso that no jamming can occur, so you open the bracket 6, so you can Loosen the engagement between the jaws and the tube.

According to the invention, a completely automated mode of operation is made possible, from the point in time at which the pipe is gripped and the movement of the piston i ± and its dome 5 in the direction of the arrow P begins.

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Claims (1)

f A f I U «9 Γ, J * 1 it «ft * * PROTECTION CLAIMS 1, device for expanding metal pipes with a body; the one consisting of two jaws, the pipe to be expanded that holding clamping device, a pipe-positioning movable stop, a conical mandrel lying coaxially to the pipe and a drive which displaces the mandrel along the common axis,
marked by a transmission device which transmits the movement of the mandrel (5) to the jaws (8a, 8b) which are to be brought closer to one another. 2c device according to claim 1,
characterized, that the two jaws (8a _f 8b) «bestizen an essentially angled (conical or prismatic) shape and are axially displaceable inside a recess (3) of complementary shape in such a way that this axial displacement is limited to a feed of predetermined length caused by the mandrel . 3. Device according to claim 2,
characterized, that the angle of inclination of the angled shape is 10 to 15, based on the axis of displacement. 4. Apparatus according to claim 3,
characterized, that the angle of inclination is 12. 5. Device according to one of claims 1 to 4, characterized in that that the movable stop has a plate (9) which is arranged between the dsm mandrel (5) and the jaws (8a, 8b) and rests against the latter on both sides of the horizontal parting plane in such a way that it prevents the mandrel from being displaced until the maximum is reached Transferring movement to the jaws. 7614723 12/16/76 β ft * f> β C * pif M 4 * * * ■ $ 1 * f &> ft • · * O β ft Λ * ¹ "*» 4 * t 6. Device according to claim 5 ₅
characterized, that the plate (9) in its lower area along a chamfer (9a) is beveled, this bevel cooperating with at least one generating line of the mandrel (5). 7. Device according to one of claims 1 to 6, characterized in that that the stop is formed by the plate (9), which. «n its upper end is articulated to a lever (11) such that it can assume different angular positions with respect to the lever. 8. Apparatus according to claim 7 _}
characterized, that the lever (11) is hinged at its other end to the body (1) and is under the action of a spring (12) " 9. Apparatus according to claim 7 or 8 _; ! characterized by \ c-.:ß the body (1) or vr. a movable, connected to the body Elsrr.ent (6) carries a stationary stop (6a), which limits the vortex movement of the plate (9) and forms a ramp, ■ pn the di-s plate as it moves upwards under the action the advance of the mandrel (5) slides along. 10. Device n - ch one of claims 1 to 9 ₃ characterized in i d'.iss the Lorr. (5) with a single-acting piston working machine; machine (2), (4) is connected, against return springs (13) into 'a direction which corresponds to the entry into the pipe, betätig-: is bu.r. 7614723 12/16/76