DE1452499A1 - Bar or wire rolling and drawing device - Google Patents

Description

DR.-1 NG. DIPL-ING. G. RIEBLING PATENT ADVOCATE Please repeat in the answer

899 Lindau (Bodensee) My message from Rennerle 10 P.O. Box 365

26th September 1968

The Vaughn Machinery Company, Cuyahoga Falls, Ohio / USA

Bar or wire rolling and drawing device

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The invention relates to a rod or wire rolling and drawing device with several power-driven roller pairs lying one behind the other, which are provided with roller grooves and successively effect a gradual tapering of the wire cross-section and with a further cross-section-reducing one arranged behind it Drawing nozzle through which the wire preformed by the rollers is pressed, as well as with one behind the drawing nozzle arranged pulling device, which the pushing force of the front of the pulling

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ORIGINAL INSPECTED

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nozzle arranged rollers on the wire supported by their tensile force to a predetermined extent.

In U.S. Patent No. 2,767,829 there is a device for pulling described by rods. The main focus is on the fact that when inserting a new rod beginning a the smallest possible waste part with a smaller cross-section, accrues. It is provided that the pulling force of the pulling device, which is arranged behind the drawing nozzle and the actual Pulling process causes alone, is adjustable to a predetermined maximum. Cross-section tapered rollers are in front of the drawing die not arranged, just guidelines.

Another device for rolling out, straightening and winding round or profiled wire is in the German patent 23 512 described. There are pairs of rollers in front of a drawing die and the wire is placed on a reel behind the drawing die wound up, which also serves as a pulling device *. If at this known device pushes a wire thickening into the drawing iron, which are eliminated when it is pulled through the drawing iron should, the take-up reel will not be able to do this thickening to pull through the drawing nozzle without the wire jamming between the drawing nozzle and the rollers.

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In addition, the drawing nozzle only has the task of removing any unevenness or to remove burrs on the wire. From a drawing process in which the final dimension and also the quality of the Wire is generated, can be out of the question here.

It is known that the tensile force that acts on the wire and the wire pulls through the drawing nozzle, for the dimensional accuracy and also for the strength (molecular structure) of the drawn wire Meaning is. In the case of devices of the present type, however, it is not only the tensile force that is arranged behind the drawing nozzle Pulling device, but to the same extent the pushing force exerted by the rolling rollers on the wire in front of the drawing nozzle in the direction of the drawing nozzle is of importance for the wire quality. This means that the pulling force of the pulling device arranged behind the drawing nozzle During the normal drawing process, the thrust of the rollers must be matched so that the two transport forces resulting resultant produces the desired wire quality.

If now when passing the wire end through the rolling device, which consists of several pairs of rollers one behind the other, the thrust of the rollers is thus inevitably reduced or after If the last pair of rollers in front of the drawing nozzle is completely eliminated, the

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Pulling force of the pulling device to the extent of the lost or decreasing thrust can be increased to the same wire quality in terms of dimensional accuracy and strength for the last part of the wire.

To achieve this is the object of the present invention, thereby is characterized in that a discharge device is provided between certain pairs of rollers in front of the drawing nozzle, which on the passage of the wire end responds and thereby to a tensile force control device the pulling device acts in such a way that the pulling force to maintain the pulling process on the pulling nozzle is increased will.

In this way it is achieved that the entire length of the drawn Strand has a consistent quality and any material waste can be avoided.

Apart from the fact that the drawing process with such Drawing press unwanted internal tensions arise in the material, exists when continuously drawing endless strands or Wired the problem of having a magazine with enough material to feed the end of one strand with the beginning of the next To be able to weld strand. Otherwise it is essential

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stopping the machine frequently at short intervals in order to thread the beginning of the following line, in particular, when large material thicknesses of, for example, three-quarters of an inch diameter are to be processed at a throughput speed about 90 m / min. With a strand length of only 360 m, the welding or threading would have to be carried out every 4 minutes which is associated with considerable costs and loss of production of the machine.

Another important object of the invention is to produce a continuous rolling mill and to create a drawing device which, due to its linear arrangement of the tools, prevents internal stresses in the material prevented.

Another object of this invention is to provide a rolling and drawing apparatus which enables a To produce the end product with the smallest dimensional tolerances.

Another object of this invention is to have a good surface quality to achieve.

Another object of this invention is to provide a strand or To create wire rolling and drawing device that enables uninterrupted operation and that with the individual strands

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can be loaded consecutively without spacing.

Another object of this invention is to provide an apparatus to create that processes rod, wire or similar material, the following steps being carried out in sequence;

a) straightening of a roll of unwound strands with conventional straightening rollers;

b) feeding the straightened strands into a series of rolling stands, which cause a gradual reduction in the cross-section of the material;

c) drawing the pre-rolled strand through a finishing die;

d) if necessary, convey messages of the completed strand a rotating roller message or the like and

e) Feeding the readjusted strand into a cutting device by means of a pulling device which is arranged between the roll message device and the cutting device.

Another object of this invention is to provide the round strand material by means of several roll stands arranged one behind the other to first deform by rolling into an oval cross-section and then to shape the material back into the round cross-section.

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This alternating deformation into oval profiles and then round profiles can be repeated as often as necessary and then repeated The drawing process takes place through a drawing nozzle, the feed being influenced by the friction drive of the individual rolling stands is done.

Further objects and advantages of the present invention will appear from the following description of examples.

In the drawings show;

Fig. 1 is a side view of a bar or wire rolling and Pulling device;

Fig. 2 is a side view of one of the roll stands; Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2; Figure 4 is a cross-sectional view taken along line 4-4 of Figure 3; FIGS. 5 and 6 each show the mode of operation of two rollers from FIG. 4; Figure 7 is a cross-section on line 7-7 of Figure 1; 8 shows a cross section through the drawing nozzle;

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9 is a circuit diagram of the control and drive elements,

Fig. 1 shows an I & ar reels 1 A and 1 B, on each of which one Role of strand S to be processed is wound up. An unwinding and straightening unit 2 A and 2 B is assigned to each reel 1 A and 1 B. The strand S is in the power-driven rollers 3 introduced and continued in the axial direction between the power-driven Straightening rolls 4. Between the reels 1 A and 1 B suitable tubular guides 5 and 6 are provided through which the directed strand S, coming from the roller carrier 1 A, so guided wir.d that the beginning of this strand S is aligned with the introduced strand S from the other of the reel 1 B and also into the common one Unwinding and straightening unit 2 B can be introduced. While the last piece of strand S of the reel 1 A is still being processed is, the beginning of the strand S from the other reel 1 B in the front thrust rolls 3 of the unit 2 B introduced so that this follows the end of the strand S of the reel 1 A. That way it can Material S are continuously fed and everything that the operator what has to do while one strand is being processed is another Place the roll on the empty reel 1 A or 1 B.

Next to the reel 1 B there is a frame 7 on its carrier the rinsing and straightening roller unit 2 B is seated.

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After leaving the unit 2 B, the directed beginning of the strand S runs successively through three pairs of reducing rolling stands 9, of which the first pair of rollers is mounted horizontally and the second pair of rollers is mounted vertically. Each mill stand 9 has a vertical pair of grooved rollers 10, the grooves of which are profiled so that the strand from the round cross-sectional profile into an oval Profile is rolled and the rollers 10 are mounted on horizontal shafts and a horizontal pair of rollers 10 on vertical Shafts is stored, deformed from the oval to the round profile. In this way, the strand cross-section is gradually tapered three times. Behind the last reduction roller stood 9 there is a guide tube 11, through which the reduced strand S presses and is guided into the drawing nozzle 12, which is located in stand 14.

Behind the drawing nozzle 12, the strand S passes through a rotary roll straightener device 15. Then the directed, reduced strand S runs between the parallel caterpillars of a pulling device 16, the twisting of the Strand S prevented by the rotating roller device. Let & me the ;; strand S is transferred from the pulling device 16 to a cutting device or the like, which cuts the strand S into pieces of equal length and feeds it to a table 18.

For example, with this device 13/16 inch round material, i.e. from 0.813 inches + 0.05 inches in diameter to 0.068 inches in diameter-

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knives can be reduced in three stages of approximately 0.022 inches per stage between each set of the mill stands 9. In doing so, the maximum diameter is reduced from 0.828 inches to 0.760 inches, after which, in order to achieve a diameter of _{0.750 inches + 0. 000 - O 3} 002 inches, the final reduction by drawing with the drawing nozzle 12 is only 0.010 Inches is.

Since the basic structure of the machine has been described, reference will now be made to the details of the reducing roll stands 9 and the Drive types provided for this purpose, as shown in FIGS. 2 to 7.

The six roll stands 9 of Fig. 1 are of the same construction, except that the next but one, i.e. the first, third and fifth, rolls with horizontal corrugations, while the others, namely the second, fourth and sixth, have rollers 10 with vertical corrugations.

As best seen in Fig. 7, each roll stand is horizontal driven by an electric motor 20 by means of a suitable reduction gear 21, the motor 20 and the reduction gear 21 on the base 7 by means of suitable angle pieces 23 and are attached. The vertical roll stands 9 in turn are each driven by a motor 25, which is fastened to an angle piece 26, via a reduction gear 27 and an angular gear 28.

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For the sake of simplicity, only a horizontal roll stand 9 is described with reference to FIGS. 3 and 4. Should the horizontal Stand 9 in Fig. 3 and 4 stand as a vertical roller used, it is with a frame plate 30, as shown in Fig. 2 best is seen, equipped.

The mill stand housing 31 is substantially rectangular in shape and has fixed front and rear plates 32 and 34, in which suitable friction-reducing bearings 35 and 36 for the individual roller drive shafts 37 and 38 are arranged. On the In addition to the needle bearing 35, the main drive shaft 37 is a drive gear 39 and the lower roller 10 wedged.

A similar gear 40 keyed on top shaft 38 is with the drive gear 39 in engagement. The top roller 10 is wedged on the upper shaft 39 as well.

The upper needle bearing 35 is mounted in a right-angled slide, which is vertically adjustable along the sides of the right-angled opening in the plate 32. Springs 42 hold the upper end of the slide 41 in connection with the adjusting screw 43, which is connected to a Handwheel 45 is equipped. The locking of the adjusting screw 43 can be done by the lock nut 46, which has a flange 47, the axially slidably wedged with screw 43, against the housing

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stuck.

In this way, the distance between the rollers 10 can be adjusted so that the passage cross-section of the roller furrows 48 is a diameter 49 smaller than the material diameter of the introduced round strand S. In this way, the strand S, as in Fig. 5, pressed into an oval cross-section and thereby elongated. According to FIG. 6, the second roll stand 9 presses the oval cross-section over its larger diameter in order to shape it back into its round cross-section and to lengthen it. These alternating compression deformations from oval to round cross-section repeat as often as necessary and in the particular example, as noted, the strand diameter is reduced from 0.813 "+ 0.015" to 0.760 "in diameter.

After the strand S with the diameter of 0.760 inches leaves the passage of the last vertical rolling stand 9, pushes it moves into the guide tube 11 and passes through the drawing nozzle 12, which, as can best be seen in FIG. 8, is a circular drawing opening 51, the left end of which diverges outward.

In the example given, the "drawn" strand is reduced from 0.760 "to 0.750" J ₀₀₂ (p by displacement.

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It should be noted that as long as the strand S of all six Rolling stands 9 is processed, they jointly generate the necessary friction to feed the strand S through the drawing nozzle 12 press.

The drawn strand S is pushed into a suitable straightening device 15, which is expediently a rotary roll straightening device which can contain skew rolls, the outer surfaces of which are concave shaped and the shafts are mounted crooked and in a rotating frame are stored.

As later in connection with the circuit diagram of FIG. 9 is to be explained, as soon as the end of the strand S passes through the first, second, etc. of the rolling stands, the thrust for the drawing process gradually decreased. Therefore, at the appropriate time, as soon as a switch is closed, the end of the strand is passed through is reported that the caterpillar feed unit 16 is affected in such a way that it exerts a greater lateral grip pressure on the strand S, so that it is not only pulled by the directional roller 15, but also the necessary, additional tension is applied in order to pull the cord through the pulling gland 12. Such increased pulling force can be achieved by greater fluid pressure in the cylinders 55 for the slides 56 of the pressure rollers 57 of the upper chain 58.

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In this way, the strand S is gripped very firmly between the grooves of the parallel chain runs 58 and 59.

The leading end of strand S coming from the caterpillar feed unit 16 is pushed further to the right, passes through suitable guides 65 and 66 and, if it is a certain length has reached (not shown) on theAJblauftisch 18. There cuts the flying scissors 17 cut it to predetermined lengths.

The flying scissors 17 are preferably arranged to have an adjustable reach of about 2 1/2 to 8 inches so that they can be used to cut short pieces. Normally, the flying shears 17 can be set to a radius of ^{6 m for longer lengths.} In this case (see Fig. 9) the flow table 18 has a switch 67 which is attached to it and set so that the leading end of the strand S closes it before it operates the measure of length. When the switch 67 is closed, the drive motor 68 of the base 69 of the flying shears 17 is switched on, so that the base and the cutting edges 70 and 71 move approximately synchronously with the strand. The cutting edge is then moved downward by a cam or the like so that the material is cut off. The lightweight blades 70 and 71 are movably mounted relative to the base 69, so that the acceleration of the large mass of the base 69 is unnecessary.

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Once the strand S is sheared, it moves naturally blade 71 upwards and blade 70 is retracted to place the severed piece of material between blade 70 and to release the length dimension.

In Fig. 9, mill stand motors 20 and 25, tractor motor 75, and flying shear motor 68 are preferred DC motors and connected to the DC generator 76 of the generator set 78. The mill stand motors is a Control switch associated with the delay contacts 79 and includes; the latter is an electrodynamic braking resistor 81 assigned, wherein when the contacts 79 are opened to open the mill stand motors armature circuits, the contacts 80 are closed are to make the electrodynamic braking member 81 in a known manner effective, so that the rotation of the rollers the roll stands 9 is braked quickly. Similarly, control switches are assigned to the front thrust unit 16 and motors 75 and of the flying scissors have contacts 82, 84, 67 and 85, the latter being connected to the electrodynamic braking resistors 86, 87.

Each roll stand drive motor 20 and 25 is for one more or less designed constant operating speed, while the speed of the rollers 10 by the associated reduction gear

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units 21 and 27. Accordingly, the machine control panel (not shown) be equipped with ammeters that measure the amperage of the drive motors 20 and 25 and of the motor 75 show, and these motors in turn are equipped with field rheostats 89 equipped; so that the currents can be controlled as desired so that each of the motors 20 and 25 tends to drive the strand S slightly faster than the actual running speed corresponds to, to drive during the successive stages of the reduction, whereby the six motors collectively the train S drive in a straight line and press through the drawing nozzle. On the other hand, the rheostat 89 of the single feed motor 75 of the pulling device becomes adjusted so that sufficient grip friction is exerted on the reduced and drawn strand to twist the strand, which the rotary roll straightening device caused to prevent and to convey the strand to the discharge table 18 and the flying shears 17.

As already mentioned, a suitable control switch 90 is provided, e.g. between the first and second roll stands, which are closed when the end of a strand S passes switch 90. If the Control switch 90 is closed, it energizes the solenoid 91 of a pressure regulating valve 92 or the like to increase pressure into the pneumatic cylinder 55, which is provided with pressure rollers 57 for the lower run of the upper chain 58 of the feed chain pulling device are connected, the grip friction on the rolled, drawn and straightened strand S between the chains 58 and 59 is increased. At the same

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Time the amperage of the motor 75 is increased so that the pulling device 16 has a predominant influence on the continuous advance of the strand S as soon as the rolling stands 9 are omitted one after the other as drive members. Accordingly, after the end of the strand S has passed through the last rolling stand 9 , the chain pulling device 16 exerts a straight pull on the strand S in order to pull the end through the drawing nozzle 12 and the directional roller 15.

Claims

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Claims (9)

Claims 1 j wire rolling and drawing device with several power-driven, successive pairs of rolling rollers which are provided with rolling grooves and successively a step-by-step tapering of the wire cross-section effect and with a further cross-section-reducing nozzle arranged behind it, through which the rollers are removed preformed wire is pressed, as well as with a behind the drawing nozzle arranged pulling device, which the thrust of the before Drawing nozzle arranged rollers on the wire supported by their tensile force to a predetermined extent, characterized in that that between certain pairs of rollers in front of the drawing nozzle a sensing device is provided, which responds to the passage of the wire end and thereby to a tensile force control device of the Pulling device acts in such a way that the pulling force to maintain the pulling process on the drawing nozzle is increased. 2. Apparatus according to claim 1, characterized in that a series of rolling stands (9) with driven, grooved rollers (10) is provided, which press the cross-sections alternately oval and round and gradually tapering and behind the rolling stands a drawing nozzle '(12) is arranged, through which the strand S is pressed, and that behind the drawing nozzle there is a power-driven, remotely controllable pulling device {16) is located. φ ft ift Q 1 Λ tf \ A '■''- 3. Apparatus according to claim 2, characterized in that several reels (IA, IB) are arranged in front of the roll stands (9) are, from each of which a wound strand is continuously unwound. 4. Apparatus according to claim 3, characterized in that a straightening device (2A and 2 B) is provided in front of the rolling stands (9) is. 5. Apparatus according to claim 2, characterized in that a rotary roller straightening device (15) between the feed unit (16) and the rolling stands (9) and the pulling device (16) is permanently connected to the strand S in a friction-locked manner. 6. Apparatus according to claim 2 to 4, characterized in that that controllable drive motors (20) are provided for the individual roll stands (9). 7. Apparatus according to claim 2 to 6, characterized in that that behind the pulling device (16) a cutting device (17) is provided which can be moved in the feed direction. 909813/0 15? 8. Apparatus according to claim 7, characterized in that that a material guide (11) is provided between the last roll stand (9) and the drawing nozzle (12). 9. Apparatus according to claim 2, characterized in that the individual roller stands alternately power-driven rollers that revolve around horizontal and vertical waves. 9 0 9 8 Ί 3 / 01G3