NL8302807A - METHOD FOR MANUFACTURING A COVER WITH A CONVERTED EDGE BY FORCING FROM A DISC-METAL PLATE, FORCING MACHINE USED THEREFOR, AND LID MADE THEREFORE - Google Patents

Description

, \ + r '- <- HO 502 Γ --------------- 5 ---! ; METHOD OF MANUFACTURING A COVER WITH A CONVERTED EDGE BY FORCING FROM A DISC-SHAPED METAL SHEET, FORCING MACHINE USED THEREFOR AND COVER MADE THEREFORE i i i | \; The Applicants named as inventors: i 5 ir. Jan Comelis GROOTHUIZEN in Wijk aan Zee

Jan MIDDEL in Nieuwesluis

Johannes Cornells KORVER in Zuid-Scharwoude

Joop VERMEIJ in Alkmaar

Hendrik FRANKE in Alkmaar and 10 Family Arend STEENKAMP in Heemskerk

The invention relates to a method for producing a cover with a flanged edge from a disc-shaped metal plate by means of forcing, on a forming machine to be used therewith, as well as on a cover thus manufactured.

15 Forcing is one of the oldest chipless metalworking. In this context, the bending is, in analogy with standard sheet NEN 5454-IV.6, understood to mean "The gradual deformation of a rotating blank into a hollow workpiece before pressing it against a rotating shape." In the special form of forcing, called form-forcing, the sheet material is deformed on a forming bench by clamping it between a tool part (the front layer) 'and a second, rotating part (the model or the bobbin), after which it is rotated pressing against the bobbin with various forcing tools.

As far as possible, dilution of the sheet material should be prevented during form-forcing, in contrast to flow-turning, where on the contrary it is essential that the wall thickness is deliberately reduced.

According to Publication No. 301, "Forcing and flux turning of steel", of the Foundation Steel Center of the Netherlands, unchanged, sixth edition, - December 30, 1980, page 8 ff., The forcing is still carried out by hand many times, whereby the end result depends on the professional competence of the forceur. The application of the hydraulics has the 8302807 i 4 * * '2. OU <d

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made possible to force large, heavy workpieces and in page 13 et seq. of said publication large hydraulic forcing machines for the manufacture of rocket parts and parts of earth satellites are discussed.

The problem that has been solved by the present invention is the rapid production of a lid from a disc, which lid is intended as part of the package for tinplate on a roll. Such rolls of steel strip, which originate from an electrolytic tinning track, have a diameter that varies between 90 and 180 cm. They are packed in a drip-water-tight 10-pack before shipping. The invention is based on the proposal to make such covers of different diameters, while maintaining a constant edge width by means of forcing to take place.

It is therefore an object of the invention to provide a method by means of forcing a hat-shaped lid with a perpendicularly bent edge from a disc 15.

According to the invention, this method is characterized in that the disc: - is rotatably clamped in its central part about its axis; at a distance from the circumference corresponding to the width of the edge to be applied for axial pressure is supported only locally; and .

- circumferentially fits in the gap between two cone rollers which are slowly moved in axial direction during rotation of the disc, thereby gradually forming the rim.

Another object of the invention is to provide a forming machine or bench with which this method can be carried out.

The forming machine according to the invention comprises a known clamping device for clamping the disc centrally and rotating it slowly about its axis and a forcing tool, and is characterized by a spool wheel 30 which locally supports the disc in axial direction at a distance from the circumference of the disk approximately corresponding to the width of the edge to be made, and as a forming tool by a set of cone rollers between which the edge of the disk fits and which can be moved slowly in axial direction thereof during the turning of the disk.

In order to be able to manufacture lids for rollers of different diameters, the machine is further characterized by a horizontal machine bed, on which a slide can be fixed and on which a conical support wheel, a motor-driven conical spinning wheel and the conically shaped spool wheel are arranged vertically movable.

40 The gap between the said set of tapered rollers, i.e. the conical 8302807/3 —-— * t * - 3 - HO 502 support wheel and the motor-driven conical forming wheel between which the disc edge fits, widens slightly to the circumference of the disc and is slightly larger than the original thickness of the plate. This circumstance permits temporary wrinkling along the edge to some extent.

However, the gap between the conically shaped spool wheel and the conical support wheel is slightly smaller than the original thickness of the plate, which results in a small amount of flow turning in the final design.

The invention also relates to the product obtained, being a lid with a flanged edge, obtained from a disc using the said method and using the said forcing machine.

The invention will be explained in more detail with reference to the drawing.

FIG. 1 shows in schematic longitudinal section a roll of tinplate, placed on a platform and provided with a packaging comprising a bottom, a jacket and a lid, for which the invention has been developed.

Figs. 2, 2A and 2B illustrate the principle of forcing in the manner of the invention.

FIG. 3 is a side view, partly in section, of a spinning machine-forming machine.

Fig. 4 is a partial plan view of the forming machine of FIG. 3.

Fig. 1 shows a rolled-up tinplate tin, a roll 1, provided with a, here vertical, reel hole 2, which is packed with a bottom or bottom cover 3, a jacket 4 and a hat or top cover 5, which surround and seal roll 1 in such a way that - partly by using waterproof packing paper (not shown) a drip-proof packaging is obtained. The roll thus packaged stands on a schematically indicated pallet 30 or platform 6 and is usually attached to it using packing tape or the like.

The actual invention is concerned with manufacturing both the bottom cover 3 and the top cover 5 from a disc-shaped sheet of metal, by forcing a perpendicularly converted edge on the periphery of such a disc.

In Fig. 2 such a disc 20 is still partly drawn in flat form, the axis of which is indicated by the dotted line a-a. This disc 20 is clamped centrally between, on the one hand, a mandrel 21 and a head 22, which e.g. an unspecified bellows-40 construction for centering can be designed in a self-seeking manner and is pressed - / 4 8302807, "- 4 - HO 502 ► t as indicated by the arrows e.e. The mandrel 21 can be rotated in the direction of rotation indicated by arrow r by means of a variable speed DC motor should be turned slowly. There is such a relationship between the speed and the disc diameter that the peripheral speed of the -5 disc is constant.

Near the circumference, the disc 20 is axially supported by a fixed, but freely rotatable bobbin roller 23 and an opposite roller, which also rotates freely, in this principle sketch. The shaft 25 of the bobbin roller 23 makes a small angle of, for example, 1 °. with the axis aa around which the disc 20 is rotated, this angle is not visible in the drawing. The speed difference is so small that this angle of 1 ° can be neglected, but this angle is nevertheless required to obtain the necessary freewheel during forcing. The end face 26 of the spool roller 23 can be hollow, so that, partly due to the inclination of the shaft 24, only a point 27 on its peripheral edge makes contact with the plate 20.

On a parallel to the axis of rotation a-a using a slow drive (see arrows) movable carriage 28, two cone rollers 29 and 30 are rotatably mounted as a spinning tool. The axis of rotation 31 of the thrust roller 29 is at an angle β of, for example, about 22 ° and the axis of rotation 32 of the taper roller 30 'makes an angle of, for example, about 17 ° with the plane of the plate 20. The taper roller 29 acts as a support wheel and the bevel roller 30 acts as a spinning wheel. The gap between support wheel 29 and spinning wheel 30 is not equally wide everywhere, but widens outwards and is large enough in the narrowest place to allow the plate thickness to pass. The descriptive line 33 of the conical surface 34 of the support wheel 29 makes an angle of e.g. approx.

10 ° with the plane of the plate 20. The descriptive line 35 of the conical surface 36 of the forming wheel 30 makes an angle of 0 ° with the plane. The descriptive line 37 of the conical surface 38 of the support wheel 29 'is parallel to the axis a-a. Due to the inclination of its shaft 25, the spool roller 23 has a slightly conical lateral surface 39, the descriptive line 40 of which (opposite the line 37) is also parallel to the axis of rotation aa, so that a parallel gap is formed between the lines 37 and 40 formed.

The forming wheel 30 is driven by a synchronous motor at a constant peripheral speed - corresponding to the said peripheral speed of the plate 20 at the point 27 on the spool roller 23 -; the support wheel 29, on the other hand, is again arranged to rotate freely.

When the plate 29 is rotated and the carriage 28 is slowly moved in the direction indicated, the edge of the plate 20 gradually deforms in the manner as sketchy with dashed lines in succession 8302807.

/ 5 «f __% It £ - * · * · The following stages are shown in FIG. 2A. The feed rate of the carriage 28 is deliberately kept small so as not to deform the material of the plate 20 too quickly, so that embrittlement and cracking are suppressed. To determine the idea, it is noted that, regardless of the plate diameter, this turn-on can be 4 mm per whole revolution of the plate. This value was determined experimentally.

The cone rollers 26 and 27 also act as a pleat holder and to roll away the pleats which may be formed in the method according to the invention, before the material in question is subjected to the actual forcing.

In Fig. 2B, which shows the part circled in Fig. 2 on a larger scale, the cross-hatched plate 20 has entered the final stage of the operation. Around the point 27 of the freely rotating bobbin roll 23, an edge is bent almost perpendicularly by forcing on the circumference of the original disc. The edge of the disc was initially located in the gap between the two cone rollers 29 and 30. This gap has a smallest width b, which is slightly greater than the original thickness d of the plate 20. When forcing in the manner of the present The invention gradually comes between the forming wheel 30 and the spool roller 23. The width c of the gap between the two cone rollers 39 and 30 on the one hand and the spool roller 23 on the other hand is slightly smaller than the original thickness d of the plate 20, so that here a small amount of flow turning will have occurred.

Figures 3 and 4 show a practically designed forming machine in which this sketched principle of the invention is embodied, which machine is intended for manufacturing packaging lids for rolled steel rolls. It is a machine in which there is also the possibility of first cutting a circle-30 round disc of 1800 mm diameter from a rectangular steel plate with a thickness of 0.6 to 2.0 mm and with a maximum size of 1800 mm, after which on the circumference of the disk by means of forcing an edge can be made.

Another possibility offered by this machine is the installation of a central collar with a maximum edge height of 65 mm around a hole previously made in the disc (in front of the reel hole of the roller).

The machine stands on the shop floor 50 on the base frame 51, the horizontal machine bed of which is indicated by 52. As can be seen from the top view of Fig. 4, the base frame 51 is of octagonal design, with two wings 53, on the ends of which there are two posts 54 each. A bridge 55 is mounted on the 40 upper ends of these four posts 54 in total.

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A pressure plate 56 hangs rotatably from a bridge 57 on this bridge construction 55. The plate 56 can be pressed onto the lower ring 59 or be lifted from it by means of a cylinder 58.

A characteristic of this machine is that the plates to be processed are fed horizontally 5 and are clamped between bottom ring 59 and tray 56.

The bottom ring 59 is mounted on the machine bed 52 and is a slewing ring 60 driven by the main drive provided in the base frame 51 but not further inclined, comprising a controllable direct current motor, the speed of which is set so that the peripheral speed of the clamped rotating disc always remains constant.

Under the bottom ring 59, an opening 61 is recessed in the bed 52, and in the space in the frame 51 below it, the drive and the means are accommodated for - if desired - a collar up to a height of 65 mm in a disc with a central hole. make this hole. These parts are not shown in the figure because this operation is not related to the actual subject, but it will be appreciated that in order to perform this operation the pressure plate 56, the bottom ring 59 and the slewing ring 60 are hollow and provide space for the intended parts and the collar to be made.

Thus, a supplied plate or disc is placed horizontally on the bottom ring 59 above the bed 52 and can be clamped by energizing cylinder 58. Before doing the latter, however, the disc must in any case be centered with respect to the vertical axis of rotation 62, and in the case of a non-X-ray plate, eg a rectangular or square plate, a circle-shaped disk must be cut therefrom.

This cutting takes place using a so-called round scissors unit, which is indicated by 63 in Fig. 3. This unit includes a carriage 64 which can be slid horizontally across the machine bed 52 to and from the vertical axis of rotation 62 using cylinder 65. A clamping cylinder 66 is provided on the carriage 64, with which this carriage 64 can be fixed on the bed 52. Furthermore, the carriage 64 carries a cylinder 67 to move a rotary blade 68 that can be driven by a motor 69 to a lower blade 70 rotatably supported on the carriage 64 which is driven by a motor 71.

When cutting, the plate is already clamped between disc 56 and ring 59. The diameter of the disc to be cut is between 900 and 1800 mm, which size can be determined by adjusting the carriage 64 using the cylinder 65. When the disc is cut, it is already centered with respect to the axis 62. 1 40 A disc that has been cut elsewhere is still centered with respect to the axis of rotation 62 8302807/7 - 7- O 502. a centering technique that will now be discussed.

The frame 51 is provided at the top with four brackets 72 extending radially from the shaft 62, which mutually enclose an angle of 90 ° in each case. For the sake of brevity and clarity, only two of these brackets are shown in Fig. 4. I

The brackets 72 and the frame 51 have an I in the manner indicated

number of free-running sprockets 73 arranged over which an endless I.

chain 74 runs such that the segments I located below the brackets 72

of the chain 74 run radially with respect to the central axis of rotation 62. In each I

10 of these radial segments have a center mug 75 on the chain 74

which can slide over the brackets 72. These can be on the edge of I.

pushing an imposed, but not yet clamped disk and this disk at I.

movement of the chain 74 to the only correct position concentric with the I.

shift shaft 62. This is done using a linked I

Chain 76 which is operated by a cylinder 72 with through rod I.

which is mounted on the carriage 64 of the round shears unit 63. This carriage I

64 carries two such cylinders 77 (FIG. 4} which, of course, simultaneously

be operated digitally. At the end of the centering of the disk, I

first clamped the disk between the saucer 56 and ring 59 and invert the I.

20 direction of the cylinders 77, after which the forcing can commence. j

The actual forcing uses the information already given to I.

Components explained by hand in fig. 2, which are shown at the in. 3 and 4 I

shown forcing machine to the left of the central axis of rotation S2 are I.

lined up.

25 On a carriage 78 that can be horizontal over the machine bed 52 I

moved by means of the cylinder 79 are the support wheel 80, the forming wheel 81 I.

with the drive motor 82 mounted. The carriage 78 has been pulled to its outermost position by the cylinder 79 while cutting a plate or centering the disc is still taking place. By reversing cylinder 79

30, the carriage 78 is brought to a position corresponding to the requested

the position matches. The clamped disc enters the gap between the supporting wheel 80 and the forming wheel 81 with the 1 edge to be converted.

The assembly of support wheel 80 and spinning wheel 81 with motor 82 is arranged vertically movable on the carriage 78, which movement can take place by means of a vertical screw spindle 83 driven by an electric motor 84.

A clamping cylinder 85 is further arranged on the carriage 78, which serves to fix the carriage 78 on the machine bed 52 during forcing. Finally, the carriage 78 carries the spool wheel 86 of conical shape. This 40 wheel is suspended freely rotating around an axle 90 which has an angle of approx. 30 ° with 8302807

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. . Include Q-de'as 62. The spool wheel 86 can be raised or lowered in the carriage 78 with a cylinder 87.

During the forcing, the support wheel 80 and the forcing wheel 81 are slowly moved upwards by the motor 82. The material of the edge of the clamped-in disc, which also rotates slowly (not inclined), which is located in the gap between the two wheels, is thereby both stretched and swaged, whereby the infeed - regardless of the disc diameter - is chosen at 4 mm per complete revolution.

The material, steel sheet of a thickness of eg 1.0 mm, has a natural tendency to bend in this operation, which is also allowed to a certain extent by the conically widening gap between the forcing wheel 81 and the supporting wheel 80, which thus working as a pleat holder.

When this gap is gradually left (with a minimum width 15 b of, for example, 1.2 mm), the plate edge between these wheels 80 and 81 is smoothed again by means of a rolling operation at the narrowest passage, because the folds be blown up again. The plate is therefore somewhat thicker locally.

The distance between the two cone rollers, i.e. the spinning wheel 81 and the support 20 wheel 80, is fixed and unchangeable during the spinning. However, an adjustment is required for a different sheet thickness. to take place.

The gap width between spinning wheel 81 and support wheel 80 on the one hand and bobbin wheel 86 on the other hand is fixed and unchangeable during the spinning.

To compensate for wear as well as when changing to a different sheet thickness, the width of this gap must be adjusted.

In the given example of a plate thickness d of 1.0 mm, this width (c in Fig. 2B) will be e.g. 0.8 mm, which means a limited amount of flow turning. This also means that the width of the flanged edge of the finished product has become somewhat greater than the distance from the tip of the spool wheel to the circumference of the still flat disc. In practice, this difference can be 1.5 to 2 cm. With a thicker plate, this edge widening is of course more important than with a thin plate.

It will be noticed that in the practical embodiment of the forming machine as shown in Figs. 3 and 4, a roller lying opposite the spool wheel 86 and pressed against it (compare roller 24 in Fig. 2) is missing. It has been replaced by a holder 88 attached to the carriage 78 which contains a rectangular block of wood 89 which can be easily replaced after wear.

In contrast to the traditional forcing on a revolving model or bobbin, the forcing according to the invention is therefore: 40 1) forced against an eccentrically placed and loosely rotating bobbin wheel 33 02 8 0 7/9 ----- i8 * - w - »- <3 - on small sector (almost a line contact) of its circumference, and furthermore 2) in one continuous movement.

Due to the conical spool wheel 86, the contact surface between the formed edge of the disc and the surface of the spool roller 86 can have a large radius of curvature, with which the circumference of the final product can be simulated.

After the forced edge has been created (which can have a width between 0 and 150 mm), the disc is stopped. After lifting the spool wheel 86 and moving the carriage 78 with associated parts outwards, the clamping of the disc is released and the pressure plate 56 is lifted so much that the lying hat-shaped lid can be removed laterally.

The machine has an extraordinarily high production capacity of forcing 1 disc per minute, which still requires some time for cutting, centering and again clamping.

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Claims (6)

1. Method of operation forcing out of a disc-shaped metal sheet, manufacturing a lid with a flanged edge, characterized in that the disc: - is rotatably clamped in its central part about its axis; - at a distance from the circumference corresponding to the width of the edge to be applied for axial pressure is supported only locally; and - circumferentially fits in the gap between two cone rollers which are slowly moved in axial direction thereof during rotation of the disc, thereby gradually forming the rim. 2. Forcing machine for manufacturing a lid with a flanged edge from a disc-shaped metal plate, comprising a known clamping device for centrally clamping the disc and rotating it slowly about its axis and a forcing tool, characterized by a spool wheel which axially supports the disc locally at a distance from the circumference of the disc approximately corresponding to the width of the edge to be made, and - as a forcing tool - by a set of cone rollers between which the edge of the disc fits and which rotates during the rotation of the disc. disc can be moved slowly in its axial direction. Machine according to claim 2, characterized by a horizontal machine bed (52) over which a carriage (78) can be moved by means of a cylinder (79), and which carriage (78) can be moved on the bed (52) secured (85), and on which are vertically movable a conical support wheel (80), a motor-driven conical forcing wheel (81) and the conically shaped spool wheel (86) are arranged. Machine according to claims 2 and 3, characterized in that the gap (b) between the set of tapered rollers, i.e. the conical support wheel (26; 80) and the motor-driven conical forming wheel (27; 81) between which the edge of the disc (20) fits, widens slightly towards the circumference of the disc (20) and is slightly larger than the original thickness (d) of the plate (20). Machine according to claim 4, characterized in that the gap (c) between the conically shaped spool wheel (23; 86) and the conically shaped support 8302807/11, 11 - HO 502 wheel (26; 80) is slightly less than the original thickness (d) of the plate (20). 6. Converted rim lid obtained from a disc using the method of claim 1 and using; the forming machine according to claims 2 to 5. J 8302807