DE1752622A1 - Device for forming a band or strip made of thin sheet metal into a tube - Google Patents

Description

DH. ING. ERNST MAIER PAT X N TANWALTY

8 MUNICH 88

VIIIIIIIXTIUII. · · ΎΜΙ.ΜΎΟΧ IHItI, »>

A 22068 June 24, 1968

EM / Pi / My

THE WOODMAN COMPANY, INC., 114 New Street, Decatur,

Georgia / U.S.A.

Device for forming a band or strip thin sheet metal into a tube

The present invention relates to tube forming and filling machines, and more particularly to one specifically for such Machine-compatible tube-forming device.

Packaging machines of this type usually contain a forming tool for forming a strip of thin sheet metal into a continuous sleeve (tube), which has an upright, having tubular body and a collar-like preform, which is at an acute angle to the tubular body extends towards. As is known, the strip is pulled over the preform and then

109847/0437

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guided downward through the tubular body with a corresponding change in angle, the forming taking place. These Type of forming tools has certain advantages over other devices, as the forming in a ' .ne tube or sleeve shape can be made without introducing folds in the strip material and without the need of the use of internal guide pins, and hence the . leaves the entire opening of the tube head free for positioning on the filling tube for an unrestricted filling operation. However, since the strip material with greater force over the direction reversal line in the deformation between the guide part and the tubular body is pulled, and since the strip material receives some abrasion, the connecting contour between the guide part and the tubular body is subject to considerable wear.

* The mold used to be after a certain period of use removed from the machine and replaced with a new molding tool or in the critical area the connection contour in which the actual forming takes place is repaired again. Because of the differences the angle at which the strip material runs over the forming line is the wear and tear on the forming tool

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stuff generally unequal, with the greatest wear occurring at the apex of the upper edge of the tubular body, which requires a time-consuming repair work and leads to the fact that the mold only in one Fraction of the useful life of a new molding tool can be used. It is also a significant expense associated with the repairs carried out earlier. The invention therefore seeks to improve the molding tool and the work process in order to avoid the described each parts.

According to the invention, a molding tool of the type described is provided which has a replaceable Has wear insert which absorbs substantially all of the frictional wear force that occurs during the forming work occurs.

It is another object of the invention to provide a molding tool with a wing-like preform, in FIG which a wear insert of the specified type is arranged such that it is essentially a contact of the Strip with the critical guide area of the mold and the preform and a resultant Prevents wear and tear to ease the problem of replacement and repair.

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It is a further object of the invention to provide a tube forming tool of the type described with a wear insert to provide, which can be easily adjusted in the mold so that the position of the guide surface the insert allows the greatest forming effect, the insert is adjusted periodically in the mold can be and presents a new, preferably reworked guide surface.

In short, the device according to the invention comprises a tubular-shaped wear insert which is immobile is fixed in the tubular body of a conventional molding tool, so that it is to be deformed by the Strip resulting wear in the critical areas. It was found that the guide surface of the insert is able to absorb a very large part of the overall wear of the mold to record. When the original shape of the guide surface is worn, so that the effect of tube molding is diminished, it is necessary to bet against a new bet with a correct history replace the guide surface contour. This not only saves machine idle time, but also a significant cost saving

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because of the relatively simple and cheap design of the tubular insert compared to the entire forming tool .

According to another feature of the invention, the insert is along the longitudinal axis of the tubular body adjustable or adjustable, so that when the profile of the guide surface is worn, the insert is adjusted upwards can be used to compensate for wear and tear. It has been found that it is because of wear and tear is usually not uniform over the entire area of the guide surface, it is preferable to use the worn one To remove the insert completely and to replace it with another insert that has previously been reworked accordingly has been. Because of its adjustability, the insert can be positioned in a corresponding position to the molding tool so that the same insert can be reworked and used several times.

Because the insert has a simple tubular shape, it can easily be coated with materials that have very good friction and wear properties. For example, it can be used with chrome or other metallic materials as well as with ceramic

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Materials can be coated without the usual risk of deformation and the critical becoming unusable Curve parts of the former and pre-former. The insert according to the present invention can be used without rejection ■ are coated with a hard ceramic layer that corresponds to around 9.5 on the Mohs' hardness scale. It used to be Danger of causing a deformation and the resulting uselessness of the entire molding device limited the achievable hardness, which was at least one unit of measurement on the hardness scale lower. By an insert coated with such a hard ceramic layer increases the wear properties of the tool Further improved, the force for pulling the strip through the die will be due to the decrease the friction on the guide surface and the inner surface of the insert is significantly reduced. Coating also has an effect of use is less in terms of cost than coating the entire mold, and it it is clear that other layers, e.g. made of the new poly-silicone plastic - e.g. that from the company 3. I. duPont deNemours and Company, V / ilmington, Delaware, at plastic offered under the trade name "Teflon" - instead a ceramic or metallic layer can occur.

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Still another G-e aspect of the invention relates the ease of customizing one with the fictional. proper use of equipped mold for manufacturing of tubes of different widths. This is achieved by using a smaller insert Width in a mold with a larger width (nominal width), so that tubes with a range of widths, at least in Range of about 25mm, less than race width, can be made with a single molding tool. With this measure, changing the machine to different tube widths is easier and more cost-effective feasible, since the operator only uses different jobs Must have widths at hand for use with the same molding tool. If the to be used Use of a smaller width than the diameter of the receiving body can be spacers between the Walls of the insert and the receiving body are introduced in order to ensure uniform deformation. Furthermore, in the described preferred embodiment forms of the invention, the guide edge - Over its circumference - so unevenly angled that it arises approximately in the strip during forming Palten smooths out again.

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Other objects and advantages of the invention will appear in the following description, taken in conjunction with with the drawing only a preferred embodiment of the invention is described. It is noticed that the inventive concept also through other embodiments can be technically realized, and that various details of the subject matter of the invention can be modified without falling out of the invention. The drawing and description are for explanatory purposes to consider the essence of the invention, but not in a way that restricts the idea of the invention Sense.

In the drawing show:

Fig. 1 is an overall view of the main area a form and fill machine, in which the molding tool according to the present invention can be used;

Fig. 2 is an exploded view of a molding tool with a wing-like preform and an in this molded part to be used according to the teachings and principles of the invention;

Fit,. 3 is a front view of the assembled Forawerkzeugs together with use according to Figure 2;

Fig. 4 is an enlarged partial section along the line 4-4 of Figure 3;

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Pig. 5 is a plan view of the molding tool with an undersized one inserted Use for forming a tube with a smaller width compared to the normal width.

In Fig. 1, a tube forming station 10 is a conventional one Tube forming and filling machine shown, in which a metal belt W extends over a series of guide rollers R moved from a supply roll, not shown, to the forming station. The forming station generally has a the reference numeral 11 designated molding tool, the the strip W is formed into a continuous tube or sleeve by means of appropriate closure means, as in 12 indicated in FIG. 1. As it is known in tube forming and filling machines, a cross lock 13 is over the The tube is molded on, the partially molded tube is filled with the filler material, and an identical or similar one The closure is molded over the closure 13 in order to complete the receiving tube for the filling material.

The molding tool 11, which is shown to describe the invention, has a long one on the end faces open body 15 which is attached in a usually vertical position to a base member 16, the suitable fastening openings 17 and a wing

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like preformer 18 having an acute angle to the Body 15 extending upper delimitation or transverse part the same forms. The cut surface of the preformer 18 and the body 15 forms a connecting contour 19, the in the illustrated embodiment, one less than the full periphery of the body 15 around this extending amount because of its open front | partly extends. Accordingly, this forms in older formers Type this connecting line 19 »at least partially, the deformation line for the strip, e.g. the point where the strip is molded into the tube. It should be noted here that if a strip is only over this Part of the entire former 11 of the present invention would run downward on both sides in the body 15 would be directed from the preformer 18 and a tube would be formed, although of lesser efficiency, so that the connection 19 can be regarded as the nominal line for the deformation. Accordingly, so far the structure that has been described so far in this part of the description, this construction of the Formers 11 considered as an embodiment known per se be ,, and therefore it should be assumed that the essence of the device according to the invention can be described in suitability for use at

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other formers of this type that have a different Shaping with respect to the body 15 and / or the contour of the connecting line 19.

In Pig. 2 shows a wear insert 25 in an unassembled position over your molding tool 11, which is to be used in the latter. The wear insert 25 is tubular in shape and is in the rest is designed so that it corresponds to the inner surface of the tubular body 15 substantially. The guide inserts 26, 27 on the front of the wear insert 25 are designed so that they cause the end position of the strip to close the longitudinal joint the tube at 12 as it is known.

According to an important aspect of the invention, the wear insert 25 has a curved guide edge 28 on its upper end face which extends continuously downwards to the guide lugs 26, 27 in order to carry out the introduction of the strip into its end position. V / ecause the strip W eggeht on and the mold 11 in its assembled state hinv /, causing the continuous FUhrungskante 28 forms the possible forming line for the strip, such as a; n best in the cross section of the Fi _t. 4 to

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know is. As already indicated, it has been found that the greatest and perhaps only noticeable wear takes place in a molding tool of this type along the line of action of the deformation; i.e. where the stripe is directed from the contact surface of the converter 18 downwards into the tubular body 15. It has too proved that the greatest amount (wear) takes place on the crown 29 (Fig. 2) of the 'ffirklinie the deformation, or on the highest or apex of the curved line of intersection between the connected surfaces. Therefore, because the line of action of the deformation is formed by the guide edge 28 of the wear insert 25, if a wear and tear of the kind described above is done, the molding tool 11 according to the invention in a simple manner by introducing a new insert 25 are renewed (repaired) with a correspondingly precise shape and a dimensioned guide edge, so that the effective operation of the device is quickly ensured again.

The cross-sectional profile of the guide edge 28 is preferably angled at right angles, as can be seen in FIG. 4, in order to create progressive angular folds C ₁ , c _? of the film W during the deformation. These wrinkles

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c., c _o in the film W aim to bring about an improved tensile elongation of the structural molecules in the strip material and thereby straighten the film W in order to eliminate any distortion which can occur as a result of the strand in Roll shape is saved. Furthermore, this sharp twisting action and molecular interaction is important in the present combination in order to be certain of wrinkling of the strip ''! in its longitudinal direction by manipulating the strip W more vigorously to spread in the transverse direction or around the guide edge 28 as desired.

A correct alignment of the guide rail 28 of the To enable the wear insert with respect to the connecting contour 19 are means for adjusting the wear insert 25 is provided along the longitudinal axis of the tubular body 15, as shown in FIGS. 2-4. These means preferably comprise an opening 30 in the wear insert 25 (FIG. 2), a corresponding one Slit in the back of the tubular Body 15 (Figures 2 to 4) and a fastening means in Form of a Scriraubenbolzens 32 together with nut 33. This device enables the wear insert 25 against the rear inner surface of the body 15 to be

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stick when the former is in the correct adjustment position. If wear of the leading edge 28 occurs, the tightening means can be used to raise the insert 25 in order to bring the funnel edge 28 in the correct position for beneficial cooperation with the strip ¹ Y.

The wear insert 25 can easily be made from the Fonawerk ™ tool 11 can be removed, if a dressing (rework) of the insert 25 is necessary, it is first removed from the body 15, and the guide edge 28 is re-profiled according to the correct contour, in order to obtain an advantageous spatial profile for the purpose described above. The stake is then 25 again inserted and readjusted accordingly.

The most advantageous or correct position of the verse insert 25 is important. 4 shown. It is such that the guide edge 28 is slightly above the connecting line 19 so that when the strip moves up and over the preformer 18, its contact with the connecting line 19 is avoided and it is then stretched (stretched) and inserted downwardly into the interior of the insert 25. , Vie in? Ig. Z> shown

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BATH ORIGINAL

represents, there is the correct position of the guide edge 28 in a position slightly above the connection ^ contour 19 round around the entire periphery of the guide edge 28 away. But if the cross-section angle in the rear part of the molding tool 11 is more pointed than on the front side, the actual oversize of the guide edge 28 becomes progressively smaller compared to the connecting line 19 to the front of the molding tool. Hence the ^ ahn of the stripe 77 so that a smooth transition from the contact ir.it the Vorfonr.er 18 to cooperate with the guide edge 28 takes place, as can be clearly seen in FIG.

From the preceding version ε η it can be clearly seen that that the use of the wear insert 25> in order to we sent the full friction or .7. Verscr.leißkraf t of the strip 7 offers certain advantages over the earlier type in that not only the cost the maintenance and replacement can be prevented, but also a more efficient deformation effect is achieved. Further advantages mentioned above result from the fact that the inner wear surface of the wear insert 25 and the edge (the surface) 28 lightly coated with friction-reducing substances

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genes can be discarded or without concern Warping the critical contour along the connecting line 19 and the guide surfaces of the preformers 18 and of the body 15, which used to be a problem. Furthermore, of course, such coatings can be more economical on the Use alone, as mentioned above.

Including the molding tool 11 for producing tubes use that are smaller than the nominal width (clear width) of the molding tool according to the present invention, the operator only needs to select a wear insert that is narrower than the tubular body 15 is as shown in FIG. The insert 25a can be attached to the rear of the tubular body 15 where it is held by friction in a position which essentially corresponds to that of the insert 25, During the working process, the strip W slides on the and over the preformer 18, bridges the gap between the connecting contour 19 and the Fuiirungsrand 28a and is then formed into a tube along the deformation line which is formed by the guide edge 28a. Around It may be necessary to ensure complete stabilization, i.e. to ensure a constant width of the mold insert 25a or it may be desirable to attach spacers 35, 36

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assign which, against the inner wall · of the tubular Support body 15. Vfie when wagering 25 is the one position of the guide edge 28a such that the strip * 7 of the connection contour 19, which forms the characteristic curve for the deformation, evades, so that essentially the full frictional wear takes place on the guide edge 28a.

It is evident that modifications are made to the device according to the invention can. For example, using an Ilehrzahl in the tubular body 15 inserted inserts possible to achieve the respectively desired line of action of the innermost insert, which is concentric to the nominal line for the forming, to be able to select. In this case one or several inserts can be removed, according to the desired width of the tube that is formed. It has however, it has also been found feasible to use inserts 25 that are up to about 25 mm undersize the diameter of the tubular body 15.

In the description, only a preferred embodiment of the invention is shown and described. However, as already mentioned, Eb can be used within

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of the concept of the invention in the subject matter of the invention various changes can be made without departing from the scope of the invention.

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Claims (11)

Claims 1. Device for forming a strip or otreifen from thin sheet metal into a continuous tube, characterized in that the forming tool (11) has a tubular body (15) and a preform part (18) which is at an acute angle to the tubular body * (15) runs and with it along a connecting contour (19) is connected, and that a Versciileiß insert (25 or 25a) immovable in the interior of the tubular body (15) is attached, over which the strip ("/) runs over in such a way that that essentially wear of the connecting contour (19) and the inner wall of the tubular Body (15) is avoided by the strip (.V) during the forming. 2. Apparatus according to claim 1, characterized in that the insert (25) has a guide edge (28), which is slightly above the connecting contour (19) of the preform (18) with the tubular body (15) over which the strip (i7) slides during the Umforiuarbeitsgang, wherein the curve of the forming for the strip (W) at a distance from the nominal line of the forming tool for the forming 109B47 / 0437 Forming lies, which is formed by the connecting contour (19). 3. Apparatus according to claim 2, characterized in that means for adjusting the wear insert (25) are provided in the tubular body (15), by means of which the insert (25) with respect to the k binding contour (19) can be adjusted to a Compensate for wear. 4. Forming device for forming a strip of thin sheet metal into a continuous tube by running over the forming tool, characterized in that that the molding tool (11) has a preferably vertical body (15) with one inclined downwards on it arranged collar-shaped converter (18), the with the tubular body (15) meets in a penetration contour (19) and such a course has that he has the strip of thin sheet metal to the connecting contour (19) and one fixed inside the tubular body (15) for guiding the strip (W) Wear insert (25) with a guide edge (28) which defines the deformation line for the strip (W) and substantially all of the frictional wear force 109847/0437 absorbs that occurs during the forming process. 5. Forming device for forming a strip of thin sheet metal into a continuously continuous one Tube by moving the strip over the molding tool, which is a preferably vertical longer, tubular body and a collar-like one Has preform part, which is in a pointed 7 / inkel extends to the tubular body and feeds the strip substantially with surface contact to the deformation point, their characteristic curve for the deformation through the connecting contour of the tubular body and the preform is formed, characterized in that the device has a tubular wear insert (25), furthermore means for securing the position of the insert (25) in the tubular body (15) through the upper one Edge of the insert (25) formed guide edge (28), | which forms the 'Tirklinie for the forming by changing the direction of the strip into the insert (25) that the working line for the forming is close to, but at a small distance from the nominal line (19) for the forming to enable that a contact strip ^(.Y) is avoided with the mold at the Veibindungskontur (19), and the guide edge (28) in the 1Ü8847 / 0437 absorbs the entire frictional wear force, which occurs during the forming process. 6. Apparatus according to claim 5, characterized in that the line of action for the üaforcung both upwards as well as radially inwards at a distance from the nominal line (19). 7. Apparatus according to claim 6, characterized by means for adjusting the wear insert in Direction of the longitudinal axis of the tubular body (15) for the purpose of adjusting the guide edge (28) for compensation wear and tear. 8. Apparatus according to claim 5 _f, characterized in that the wall of the insert (25a) is at a distance from the inner wall of the tubular body (15) for forming a tube of less than 7 / eite than the nominal width of the molding tool. 9. Apparatus according to claim 8, characterized by the arrangement of spacers (35,36) between the wear insert (25a) and the tubular body (15), through which the wear rate is determined. 109847/0 437 ^: BATH 10. The device according to claim 7 »characterized in that the locking means one in the tubular Body (15) arranged longitudinal slot (31), a corresponding opening (3C) in the insert (25) and Have locking means (32,33) which are passed through the opening (30) and the slot (31) to clamp the insert (25) against the inner surface of the tubular body (15). | 11. The device according to claim 5, characterized in that that the guide surface (28) is angled in such a way is that it forms a gradual transition for the strip (* 7) on the line of action for forming, uia. a Cause longitudinal smoothing of the strip. 1.U 9847/0437 Blank page