SU1406886A1 - Apparatus for making corrugated pipes - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to equipment for the hydroforming of articles with annular corrugations of pipes. The purpose of the invention is to increase productivity by shortening the cycle. forming each corrugation and reducing the time for loading, unloading and changeover. Two pairs of locking semi-matrixes (PM) are closed, opened and moved in the axial direction independently of one another. This makes it possible to move the pipe to the step of the corrugations together with the arrangement of the castle PM during the return stroke of the hydraulic cylinder of the corrugation of the corrugation. The workpiece during the whole process in the gt number and during the auxiliary movements of the mechanisms is held by a pair of closed PM. During the forming of the corrugations, the locking plates are stationary and locked in a closed state by means of recesses made in them by cylindrical locks transmitting the radial force or molding to two. closely spaced unrestricted traverses. The billet tube is loaded by putting it on with a gap on the mandrel to an adjustable stop. 2 hp f-ly, 4 ip. (L

Description

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The invention relates to the processing of metals by pressure, in particular, to equipment for the manufacture of articles with ring corrugations from pipes by the method of hydroforming.

The aim of the invention is to increase productivity by shortening the jogging cycle of each corrugation and reducing the time for loading / unloading and changeover.

FIG. 1 shows an axial section in the plane of the closed semi-matrix {FIG. 2 - section AA in Fig.1; on fig.Z - section bb in figure 2; figure 4 - section bb In figure 1.

The device comprises a frame 1, on which a mandrel 2 is fixed with sealing rings 3 and A and a channel 13 for supplying the forming liquid. | On the base 1 there are also fixed two | rolling pins 6 and 7, which are parallel to the mandrel on its sides. The rolling pins 6 and 7 wear sleeves 8 and 9, 10 and 11, respectively, with which semi-matrices 12, 13, G14 and 15 are rigidly fastened. A pair of sleeves 8 and 9, 10 and 11 | are pairwise connected. in the axial direction, each pair is provided with a pre-drive along the skalok in the form of hydro-cylinders 16 and 17 and a rotation drive in the bush IB of 8 ... 11 gears 18 connected to each sleeve, coupled with slats 19 connected in pairs between by itself and with the hydraulic cylinders 20 kx of movement by the slats 21 (FIG. 3). The semi-matrices 12 ... 15 are equipped with profile inserts 22. In the closed state, semi-matrices 12 and 13 mounted on a rolling pin 6, their contributions 22 form one working point, similar to inserts 22 semi-matrices 14 and 15 mounted on a rolling pin 7 , form another work point. The device also has an extreme one-piece matrix 23 installed in the holder 24, provided by, p: moving from the hydraulic cylinders 25, and to the yoke 26, which is mounted movably in the axial direction from the hydraulic cylinders 27. The traverse 26 covers without interaction the extreme matrix 23 and acts with the end on the contributions 22 of one of the pairs of semi-matrix 12 and 13 or 14 and 15. The mechanism of keeping semi-matrix in closed states contains two cylindrical locks 28, moving from hydraulic cylinders 29. Clamps 28 are mounted from the sides of the mandrel 2 on opposite sides of the plane aze

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a semi-matrix (Fig. 2) and placed in the slots 30 of the movable cross member 26, and the socket of the sockets 30 allows the retainers 28 to be completely inserted into them. In the extended condition, the retainers 28 interact with the recesses 31 of the half pipes and enter the fixed holes 32 traverse 33. Traverse 33 is fixed on rolling pins 6 and 7 by means of housings 34. The inner surface of the extreme matrix 23 is made with a small taper, a larger diameter is made at the profiled end and is equal to the diameter of the bottom of the corrugation. The p hole corresponds to the outer diameter of the original blank pipe, taking into account a gap of about 0.2 mm between it and the die 23, necessary for the free loading of the blank pipe into the device. On the mandrel 2 there is a movable retaining ring 35.

In the initial position, the semi-matrix 12 ... 15 is closed, pressed by the movable cross-beam 26 to the fixed cross-bar 33 and fixed with cylindrical locks 28. The extreme matrix 23 is set aside for the distance required for a set of portions of the workpiece material for one corrugation. The blank billet 36 of the measured length is put freely on the mandrel 2 until it stops in the ring 35, which is fixed on the mandrel 2 in such a position that ensures the formation of the first corrugation in the calculated place of the workpiece. With the help of sealing rings 3 and 4, seal the cavity 37. billet 36 and the channel 5 serves in it forming fluid under pressure. Then, by moving the extreme matrix 23, a corrugation is formed on the billet pipe, and then the pressure of the forming fluid is released and the cavity 37 expands. Then, when the hydraulic cylinder 17 is hydraulically locked, the extreme matrix 23 and the mobile yoke 26 are simultaneously reset to the initial position and the hydraulic cylinders 29 retract the latches 28 nests 30, freeing the semi-matrix 12 ... .15. Immediately after retaining the retainers 28 by rotating the sleeves 8 and 9 in different directions, by moving the corresponding pair of rails 19, the semi-matrixes 12 and 13 are opened to such an extent that their contour in plan completely extends beyond the contour of semi-matrix 14 and 15, which remain

closed (figure 2). In this state, the sleeves 8- and 9 with semi-matrixes 12 and 13 are moved to the position shown in Fig. 1 by a dotted line, and by turning the sleeves 8 and 9 backward they close the semi-matrixes 12 and 13. At the same time, their inserts 22 are obviously lower than the last formed corrugation and can not hurt it. After that, the f.xators 28 move in and at the same time the crosspiece 26 presses both pairs of inserts 22 to the fixed cross member 33. The device returns to the second initial position, which differs from the first one in that the semi-matrix pairs are reversed relative to the crossbars 26 and 33. The molded part of the product 38 when this captures me. Do closed pairs of inserts 22 and exactly moves to the corrugation step (thickness of the insert 22) while simultaneously removing from the mandrel 2 and going out of the device.

The next corrugation molding cycle proceeds in the same way as described, except that now the half-matrix 12 and 13 will remain closed, and open, will move from the hydraulic 1D5Lindra 17 and the half-matrix 14 and 15 will close. And the device will come back to the first starting position.

After forming a predetermined number of corrugations on the mandrel 2, a small remainder of the smooth part of the preform tube 36 will remain, which can be easily removed from painting 2.

The proposed device has the following advantages compared with the prototype.

More simple and compact design. There is no bulky lever mechanism held together by the half-hems in a closed state, the latches and dies under load are stationary and therefore the base of the workpiece is greatly axially aligned, which affects the accuracy of the diagrams of the tops of the corrugations, and the possibility of damage to the corrugations when the semi-matrix is closed. This provides higher quality products.

The economic effect of the introduction

devices will be obtained by reducing the cost of the device itself, increasing its performance, reducing maintenance costs (readjustment, repair), reducing the number of equipment (existing molding inserts from cassette machines and forming heads can be used), as well as reducing the number of scrap from for inaccurate sizes and

Damage to the corrugations.

Claims (3)

1. An apparatus for making corrugated pipes from blank pipes. a mandrel rigidly fixed at one end on the frame and two sealing rings mounted concentrically with the mandrel, at least two pairs of profiled semi-matrix, placed coaxially with the mandrel, and an extreme matrix with a profiled end and a smooth inner surface, as well as a billet feed mechanism for a step containing power cylinders, the rods of which are connected with profiled semi-matrices, a semi-matrix closing and holding mechanism in a closed state, and hydraulic cylinders of corrugation , different in order to increase productivity, it is equipped with two rolling pins placed parallel to the axis of the machining end, with two guide bushings mounted on each of them. Mu wear out a little. Clamps very 45 rigidly connected with the corresponding easily replaced during repairs. The transverse dimensions of the device with the same sizes of products are reduced not less than 1.5 times. By combining; 1 the movements of the molding cycle and the acceleration of these movements as a result of the reduction of the moving masses and the required efforts of the hydraulic cylinders, the cycle time is reduced. In addition, equipment downtime is reduced by simplifying readjustment and load / unload operations. This allowed- ;; does not improve equipment performance. semi-matrices fixed in pairs one relative to the other in a plane perpendicular to the axis of the mandrel, the feed mechanism of the billet pipe to the CQ step is equipped with a movable cross-beam with the central hole for placement of the extreme matrix and with two peripheral holes installed with the ability of the end face to interact with the semi-matrix, the closing and holding of the semi-matrix in a closed state is made in the form of a drive of independent rotation of the semi-matrix with respect to the rolling pin and a fixed cross bar 55 semi-matrices fixed in pairs one relative to another in a plane perpendicular to the axis of the mandrel, the billet feed mechanism per step is equipped with a movable cross-arm with the central hole for placement of the extreme matrix and with two peripheral holes installed with the ability of the end face to interact with the semi-matrix, the closing and holding of the semi-matrix in a closed state is made in the form of a drive of independent rotation of the semi-matrix with respect to the rolling pin and a fixed cross bar five t; openings coaxially peripheral with the openings of the mobile traverse mechanism for feeding the pipe-logging per step, placed on different sides of the closing plane of the semi-matrix, as well as cylindrical latches, placed And the openings of the movable and fixed tpaeepc with the possibility of moving, and the outer surfaces of the semi-matrix, notches for cylindrical latches, and the extreme matrix is made one-piece, while its internal smooth surface is made onic with a large base at 1 | fyle fillet. / X / X // X, 1 2. The device according to claim 1, characterized in that the drive of independent rotation of the semi-matrix with respect to the rolling pin is made in the form of gear wheels mounted on each guide bush and interacting with them gear racks mounted on the frame, as well as the power cylinder connected with slats. 3. A device according to claim 1, wherein the mandrel is provided with an abutment ring for egotoka, which is installed with the possibility of adjusting movement. fi-a /five 31 28 32 12, t 33 % N 12 22 13 FIG. g 15, 26 thirty sh but . ,,,,, - 777777 / X / yy / xxXyVy .fc :: L Thebes Jj