DE1193004B - Screw suture tubing with winding of the diagonally tapering tape on a mandrel - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN JfllTTml · PATENT OFFICE

EDITORIAL

Int. α .:

B 21 c

German: 7 b -9/01

Number:
File number:
Registration date:
Display day:

1193 004
B64052Ib / 7b

September 19, 1961

May 20, 1965

The invention relates to a screw suture pipework with winding of the tapered tape a rotationally driven mandrel and ongoing welding of the adjacent edges by a stationary one Welding device, with an axial drive acting on the pipe causing the continuous movement causes the tube on the mandrel.

It is known in the manufacture of screw sutures to keep the belt cold under one of the belt widths corresponding helix angle to a drivable mandrel to attach to this, the Then set the mandrel in rotation and thereby the tape to a helix with adjacent one another Wrap edges. There are fluctuating gap widths caused by changes in the width of the belt or are caused by saberatism, detected by buttons and controlled by changes in the inlet angle. The edges are welded by means of a stationary welding device. The pipe is doing this axially pushed off continuously, which is achieved by a butt collar of the dome or by means of axially displaceable Parts of the mandrel can be done. Often the mandrel is provided with rollers so that it can be used during the winding process tangentially, but does not oppose any frictional resistance when the pipe is pushed off.

In the invention, the finished tube of an axially displaceable tailstock mandrel, which it at the front Detected end, driven in rotation and at the same time axially withdrawn. By influencing the peeling speed you have a simple means of adjusting the welding gap, which is otherwise only through Pivoting the band or tube leg is possible. In the case of the invention, the inlet angle remains constant.

According to the invention, the mandrel consists of two rotatable and opposing faces Parts, namely from a headstock mounted on a headstock that is forcibly displaceable by a short stroke Part and one on one displaceable by a spindle gear according to the pipe pitch Tailstock mounted as well as provided with a fastening device for the beginning of the tape Part. At the beginning of winding, the tailstock mandrel, which acts as a support for the pipe end and as an axial transport element, is guided into the strip feed level one, begins the work process on this and then transfers the run-up point of the Band with axial displacement of both sticks on the then remaining spindle stub mandrel, while the tailstock mandrel moves axially until it reaches any pipe length.

High accuracy of the screw suture tubes produced is thus achieved according to the invention by using a screw suture tube work with winding of the
tapered tape on a mandrel

Applicant:

Bristol Aerojet Limited, Bristol (Great Britain)

Representative:

Dr.-Ing. H. Negendank, patent attorney,

Hamburg 36, Neuer Wall 41

Named as inventor:

William Napier,

Derrick Howard Ranford, Bristol

(Great Britain)

Claimed priority:
Great Britain September 21, 1960
(32441)

that the pipe is pulled and not pressed, because it is very easy to control the gap is. Pipe works according to the invention are simpler than known ones.

In an expedient embodiment of the device according to the invention by scanning the welding gap controlled edge spacing of the adjacent tape windings is taken by the scanning device Influence on the feed rate of the tailstock. In a further embodiment, the scanning device controls a rotary drive of the one located in the tailstock and, in turn, a rotary drive Lead screw axially displaceable spindle nut.

The headstock mandrel can rotate freely or necessarily at the same speed as the tailstock mandrel to be turned around.

The invention is of particular value in connection with rocket motor housings, as it can however, they can also be used in the manufacture of pipes.

The invention will now be explained with reference to drawings, for example.
F i g. 1 is a side view of an apparatus;

F i g. FIG. 2 is a top plan view of the apparatus of FIG Fig.1;

F i g. 3 and 4 are schematic representations of two stages of work during winding in plan;

F i g. Figure 5 shows a section along the line V-V of Figure 2;

509 570/156

F i g. 6 is a section similar to FIG. 5, but by a different arrangement;

F i g. Fig. 7 is an enlarged section through the tailstock showing a modified form of the same;

F i g. Figure 8 is a plan view of another embodiment of the device;

F i g. 9 is a side view of the device according to FIG. 8th.

The in the F i g. Apparatus 10 shown in FIGS. 1 to 5 comprises a rigid bed 11 supported on columns 12 in FIG is stored at an appropriate height or sits directly on concrete foundations. They are on bed 11 The headstock 13 and the tailstock 14 are arranged in guides. In between is a headstock arbor 15 and a tailstock mandrel 16 is arranged. These are according to FIG. 2, 3 from a mandrel shaft 17 via pulleys driven within the drive receiving arms 18, 1? are included. These Arms 18, 19 are arranged on the headstock 13 and the tailstock 14, respectively. The pulley within each take-up arm slides on mandrel shaft 17 but is keyed in a keyway attached, which extends over the entire length of the mandrel shaft. The drive will then go through a belt drive and a worm gear arranged in the spindle or tailstock the mandrels 15 or 16 of the spindle or tailstock transferred.

The headstock 13 can have limited longitudinal movement on the bed 11 of the device carry out. This movement takes place due to the action of a pneumatic or hydraulic Headstock jack 20, which has a cylinder 21 anchored to the bed 11 at 22 and one through a Connecting device 24 has ram 23 connected to the headstock 13. To the limit This movement in adaptation to the tape to be wound positive stops are arranged. Of the The headstock mandrel 15 is removably mounted on the headstock 13; he moves with the headstock together in the longitudinal direction of the machine.

At the headstock end of the machine are electric motors, drives with variable transmission and couplings, which are indicated as a block at 25. These form the drive for the Mandrel shaft 17 and for a lead screw 26.

The lead screw 26 meshes according to FIG. 7 with a lead screw nut 68 which is attached to the tailstock 14 is attached so that rotational movement of the lead screw 26 rests the tailstock on the bed 11 of the device emotional. The tailstock mandrel 16 is also removably mounted on the tailstock; he moves with the tailstock.

The lead screw 26 and the mandrel shaft 17 extend extend over the entire length of the device and are spaced apart by bearings 27, 28 based on their length. These bearings are arranged in blocks that tilt away when the nut of the tailstock or walk past the drive retainer arms.

A tape guide 29 is provided on one side of the device 10 as shown in FIGS. At one end, as shown in FIG. 5 at 31, 32, a frame 30 is rotatably attached to a fixed base plate 33, while an electrically operated spindle lifter 34 is connected at 35 to the other end of the frame. The housing of the lifter 34 is mounted on pins 36, which continue from the fixed base plate 33, so that the lifter can pivot during its extension or retraction movement. The lifter 34 enables the guide 29 to be set tangentially to the size of the respective dome. The band 39 can have different thicknesses.
According to FIG. 5, a guide unit 37 is arranged on the frame 30, which consists of rollers 38 and tape side guides. The belt runs between the rollers, with at least one of the rollers being adjustable on the frame by means of screws 40

ίο is to change the tension applied to belt 39 as desired. Rollers driven by an electric motor 41 are used to drive the belt 39 up to the thorns at the start of the work process. According to FIG. 2, the unit 37 can be pivoted with respect to the frame 30 on an arc of a circle 42, the central axis 86 of which is the intersection of the plane XX and YY .

The tape is stored in a collar at 46 (see FIG. 5).

ao Between the rollers 38 and the mandrels 15, 16 there is a further roller arrangement 43, the roller 44 of which is adjustable parallel to the axis XX of the mandrel precursors and radially to the mandrel axis. A pneumatically driven grinding tool 45, which is used to sever the tape 39, is attached to this. According to FIG. 2, 5, 6 double welding devices 47 are arranged, which are located above the normal working position of the headstock mandrel 15. The welding devices 47 are individually adjustable; arm 48 can also be raised and lowered by a pneumatic or hydraulic lifting device 51. The arm 48 moves in guides 49 on the frame 50. These welding devices can be of any type. The drawing example shows an electric arc welding unit in which the welding wire runs off coils arranged on the arm 48.

Argon gas is above the weld over the electrodes and also to protect the Underside brought up.

In the F i g. 1 and 2, a tube 53 is shown extending through the headstock 13 and to various radial bores 54 (cf.

Fig. 2) strikes the headstock mandrel 15. These lead argon gas to an annular groove 55 in the Surface of the headstock mandrel 15 immediately below the weld. The weld is made by means of Protective gas carried out under shielding from the atmosphere.

The welding devices 47 can be used individually or together, depending on the thickness of the material to be welded.
In operation, a headstock mandrel 15 and a tailstock mandrel 16, the diameter of which corresponds to the clear dimension of the pipe to be wound, are arranged on the headstock 13 and the tailstock 14, respectively. The drive ratios for the mandrel shaft 17 and the lead screw 26 are chosen so that their relative speeds and the feed rate of the lead screw causes one revolution of the tailstock mandrel 16 and an axial displacement of the same at speeds that produce the correct pitch angle on the pipe to be wound.

The headstock mandrel 15 is rotated simultaneously with the mandrel 16 of the tailstock; however, he will not shifted in the axial direction by spindle 26, but by lifter 26.

5 6

The headstock lifter 20 is now reset to the pivot points 57, 58, but is pulled so that the headstock 13 with the spindle can be operated in a manner similar to that already used in the cutting mandrel 15 in the FIGS. 1 and 2 shown is prepared. In this case the dispatch position can be moved. The mandrel 16 of the necessary, on the headstock 13, a fixed tailstock will then be arranged towards the headstock mandrel 15 5 guide shoe 59. This guide moves until the two butt against each other. Shoe 59 has a flange which overlaps the spin-die band of the federal delstockdorn 15 seated in the bracket 46, and the inclination of the riser is made through the guide unit 37 to the angle of inclination of the pipe. The flange roller unit 43 continues and then by means of a grips the free edge of the first turn of the Ban anchor screw 56 (see FIG. 2) on the tailstock on the headstock mandrel after the spindle mandrel 16 is attached. The last roller 44 is thus stocked once it has reached its normal position; it ensures that it brings the tape evenly across its entire width into contact with the mandrel, the guide shoe 59 serves as additional means. to maintain the correct angle of inclination is then brought up to the headstock lifter 20 and to push off the angled and welded hydraulic or pneumatic pressure, 15 th tape from the headstock mandrel. For the verder cause the lift to expand; Then the mandrel shaft 17 and the lead screw 26 are required in each case with different flanges of the mandrel diameter and pitch angle.
Offset. The rotation of the lead screw causes a movement of the tailstock mandrel 16 in the direction of the strip when it arrives under the welding links according to FIG. 1 to 4. The headstock mandrel 15 20 devices 47 must known to be precisely controlled and the mandrel 16 of the tailstock are rotated by the mandrel shaft 17 to ensure a uniform weld, and the headstock mandrel to deliver. The F i g. Fig. 7 shows a device which, since a pressure is exerted by the headstock lifter 20 such that it exerts an automatic gap control, is ensured in constant contact with it.

Mandrel of the tailstock, moved in the axial direction. 25 Above the gap is between abutting

The common rotation and movement of the two turns just before the welding position

the mandrels in the longitudinal direction forms a few turns of the sensing device 60 (FIG. 5). This tactile

of the band 39 first on the tailstock mandrel and device 60 provides a signal which is a measure

then on the headstock mandrel. of the gap and changes in the gap

As soon as one revolution has been carried out, 30 widths between the successive windings

the welding device 47 is activated, depending on this point. This signal is on

however, the weld seam is only then completely passed on to a control device 61, which the

shielded by the argon gas when the welding speed of the electric motor 62 controls. The drive

ßung over the annular groove 55 in the spindle from the motor 62 takes place via a V-belt 63, a

Mallet 15 takes place, so that a really strong 35 reduction gear 64, a clutch 65, a

Connection is established. The headstock 13 er worm 66 and a worm wheel 67. The worm

the limit of its axial movement on this kenrad 67 is made in one piece with the guide nut 68

Point and is stopped by a stop; the latter of the lead screw 26 formed or wedged thereon. the

has been previously set so that it allows the correct rotation of the spindle nut 68 with respect to the riding

Working position. This position is in the 40 floor 14 increases or decreases the extent of

F i g. 3 shown. Axial movement of the tailstock 14 depending on their

If the activity is continued, the headstock direction of rotation depends on the immediate mandrel 15 continues its rotation, but does not have a speed derived from the lead screw 26, further axial movement. However, the mandrel only performs one rotation around the electric motor 62 16 of the tailstock to enable its rotation as well as its movement 45 in one direction is the drive of the Movement along the bed and selected from the lead screw 26 so that it is the lead screw Mallet 15 continued to go out. Here he pulls the issued a speed that is greater than that actually welded pipe is required from the headstock mandrel. This has an increased motion under, while continuing to weld tape at the speed of the tailstock 14 result. Of the the headstock mandrel is wound, which in 50 electric motor 62 displaces the guide nut 68 slowly F i g. 4 is shown. The tape slides axially off the in the same direction as the lead screw 26 in Um-headstock mandrel down. rotation, which thus slows down the riding

When the required length of the pipe has been made 14 to its correct speed of movement

is set, the device is stopped; the consequence.

Welding devices 47 are removed from the pipe 55 It follows that by a simple change

lifted, the belt 39 by the grinding tool 45 tion of the speed of the electric motor 62 according to the

separated from the pipe. signal received by the sensing device 60

The pipe is then moved by a crane or wagon in the gap width of a previously fixed

added with fork lifter, while the mandrels set size is countered and one im

of the spindle and tailstock axially pulled out 60 substantially constant gap width between the

will. The pipe is then moved away from the machine, edging successive turns at its

upscale. The initial turns of the pipe, i.e. H. Approach to the welding devices 47

those to which none or insufficient rights can be maintained.

Welding are removed and the guide nut 68 can be fastened via a belt 71 and

Machined pipe ends. 65 a bevel gear 72 by means of a handle 70 by hand

Optionally, the belt 39, as shown in FIG. 6 can be actuated. In this case the electrö can be shown is, also under the mandrels 15 and 16 out motor 62 by actuating a clutch 65 with be. The tape guide 29 will be put out of operation alternately by a lever 69.

In the F i g. 8 and 9 a smaller device is shown. As a result of the smaller diameter of the pipe to be wound and welded, certain features have been simplified. This device 110 has a rigid frame 111 which is supported by columns 112 at an appropriate height. On the frame 111, a headstock 113 is disposed and on the frame 111 as in guides mounted a tailstock 114th The headstock mandrel 115 and the tailstock mandrel 116 are arranged between the headstock and the tailstock. The headstock dome 115 and the tailstock mandrel 116 are each provided with a wedge which extends over the entire length of a mandrel shaft

117 extending keyway has a sliding fit. The mandrel shaft can be rotated by moving the two sticks.

On the headstock dome 115 is a sliding body

118 which is slidably mounted in guides of the support block 119 so that it can be moved axially in both directions with respect to the longitudinal axis of the machine by means of a hydraulic or pneumatic jack 120 , the jack 120 one at 122 on part of the headstock anchored cylinder 121 and a plunger 123 which is connected by a coupling device 124 to the sliding body 118.

At the headstock end of the machine, housings 125 and 126 are provided which contain motors, gears with variable ratios and clutches via which drive connections to the mandrel shaft 117 and the lead screw 128 are established.

The lead screw 128 engages a nut attached to the tailstock 114 so that rotation of the lead screw moves the tailstock in one direction or the other along the bed of the machine. The tailstock mandrel 116 is connected to the tailstock 114 so that it moves with the tailstock in the longitudinal direction along the machine. The mandrel shaft 117 and lead screw 128 extend through the tailstock 114 and are supported by bearings of the shaft bearing body 129 .

The tape storage and feed device is arranged on one side of the machine 110. This consists of a support frame, which is shown as block 130 , on which a shaft 131 is arranged, which is supported by side frames 132 in order to receive a tape reel 133 . The support frame also houses guide rollers 134 and side guides 135 . All these parts are arranged in the frame 130 and can be pivoted with it on rollers which come into engagement in a track 136 which forms an arc of a circle. The center of this circular arc is, as shown in FIG. 8, the intersection of the vertical plane, which contains the axis XX of the mandrels, with the vertical plane, which the center line YY of the tape 137 as it is fed from the reel 133 to Machine contains A last roller 138 is arranged between the guide rollers 134 and the machine. The axis of this last roller 138 is parallel to the axis XX of the mandrels and is adjustable.

A welding device 139 is arranged above the normal working position of the headstock mandrel. This welding device is adjustable both in height and in axial direction and laterally with respect to the machine. Argon is fed to one side of the weld seam behind the electrode and to the other side of the weld through guides in the mandrel shaft 117 and the headstock dome 115.

The sequence of operation is similar to that in connection with the device according to FIGS. 1 to 5 described. However, the dome shaft 117 must be removed from the machine before the finished pipe can be removed.

Claims (3)

Patent claims: 1. Seam pipe work with winding of the tapered tape on a rotationally driven dome and ongoing welding of the adjacent edges by a fixed welding device, wherein an axial drive acting on the pipe causes the continuous movement of the pipe on the dome, characterized in that the mandrel consists of two rotatable as well as parts facing each other on the face side, namely a part (15) mounted on a headstock (13) which is forcibly displaceable (20 to 24) by a short stroke and a part (15) which is displaceable by a spindle gear (26, 68) according to the pipe pitch ( 14) and part (16) provided with a fastening device (56) for the beginning of the tape, whereby at the beginning of winding the tailstock dome (16), which acts as a support for the pipe end and as an axial transport element, moves into the tape feed level, on which the work process begins and then the run-up point of the tape below r axial displacement of both stocks (13, 14) on the headstock dome (15) and finally, with the headstock dome (15) remaining fixed, but further axially migrating tailstock mandrel (16), can be continued up to any pipe length. 2. Device according to claim 1 with the edge distance controlled by scanning the welding gap of the adjacent tape windings, characterized in that the scanning device (60) influences the feed rate of the tailstock (14). 3. Device according to claim 2, characterized in that the scanning device (60 ) controls a rotary drive (60 to 67) of the spindle nut (68) located in the tailstock (14) and axially displaceable by a rotationally driven lead screw (26). Considered publications:
German Patent No. 881489;
French Patent No. 402,859;
Belgian Patent No. 550693;
U.S. Patents Nos. 2549 032, 2136 943,
284, 1 918 137, 1868 039. Legacy Patents Considered:
German Patent No. 1101331. In addition 3 sheets of drawings 509 570/156 5.65 @ Bundesdruckerei Berlin