DE2702474A1 - METHOD OF MANUFACTURING A LONG ELEVATED PART AND DEVICE FOR CARRYING OUT THE METHOD - Google Patents

Description

Ml LLKR-IH) IlK · DKUFEL · SCHON · HEHTEL P Λ T E NTAN W ALTE

DR. WOLFGANG MÜLLER-BORE (PATENT LAWYER FROM 1927-1975) DR. PAUL DEUFEL, DIPL.-CHEM. DR ALFRED SCHÖN. DIPL.-CHEM. WERNER HERTEL. DIPL.-PHYS.

Munich, Hl / ma - G 3011

GKN SANKEY LIMITED

Albert Street Works, Bilston
West Midlands, England

Method of making an elongate part and apparatus for performing the
Procedure

The invention relates to the production of shaped (and if necessary perforated) elongated parts from a flat metal strip or strip. "Shaped ¹¹ " means the following: The part is provided with one or more bent edges or flanges, ie

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it has a U- or L-shaped cross-section.

The invention has been developed for the production of side parts for the chassis or chassis of trucks. These side panels can be up to 12m (kO feet) long. So far it has been customary to form such side parts with wheel arches; Recently, however, the requirement has been made to produce substantially straight side parts, although they can be tapered at one or both ends.

Such side parts are made from a steel strip that has been rolled for this purpose. Such tapes are generally arched or curved; i.e., the edges of the tape between which its width is measured is bent. In addition, the bending of the individual ribbons in a batch of ribbons is made by one Rolling mill are fed, each different; so it is not practical to use the tapes like that either to roll so that they are essentially straight, or to roll several strips with the same curvature.

The curvature of the belts was insignificant if side parts with wheel bends were to be produced, because the tape had to be given a certain shape before it was deformed. However, if a straight line Side panel is to be made, so it would be useful to start with a straight band, like that that the smallest possible amount of material could be used. Since such rectilinear ribbons are not are readily available, among other things, the following process has been used: From the rolling mill a band was obtained that was wider than would be required if it were straight; Then it will be the tape trimmed or cut off, so that a straight tape blank is formed before it is punched and is deformed. However, this procedure goes through

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lost a relatively large amount of material; for example, the tape must be about 7 »5 cm (1 1/2 inches) wider than it would have to be if it were straightforward; In addition, a cutting process is required, which in addition to this loss of material the cost of manufacturing the side panel is increased.

Another problem is that a side panel for a motor vehicle is generally several hundred Has holes to be punched in this part; these holes must be within very close tolerances be positioned so that they are in the desired locations in the finished chassis, when the side panels are assembled.

It would theoretically be possible to straighten the edge of the tape, i.e., do so to deform so that the edges defining its width are rectilinear before deforming the tape or if necessary is provided with holes. You could use a curved band to do this, straighten the edge of that band, it make holes and then shape. However, to the remaining plastic deformation of the bent To obtain the tape required to form a rectilinear tape, the tape must be beyond what is required Be straightened or "bent over" so that the band is straight when the deforming force is removed and the elastic recovery is removed occured. This approach might be practical if all of the tapes being fed are of the same curvature; however, since this is not the case, it would be necessary to make the edge straighter for practically every band; this method is therefore very time-consuming and therefore cannot be used in practice.

The invention is therefore based on the object

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To provide a method of making shaped, elongate parts, in which the above-mentioned difficulties be avoided.

According to the present invention, a method for Proposed production of an elongated part from a flat, rolled metal strip, in which the Band is elastically deformed (as it shall be defined below) while it is flat, so its Edges take on the desired shape, then the tape with at least one bent edge is formed while it is held in its elastically deformed state.

According to a preferred embodiment, the bent Edge formed so that it is essentially in the direction of the rolling structure or in the rolling direction of the strip runs.

By "elastic deformation" of the band it is meant: When the force deforming the band is canceled becomes, the band will resiliently spring back to a shape other than the desired shape. The deformation, that is exercised to bring the tape into the desired shape can have a certain amount of plasticity Contain deformation as well as elastic deformation; However, the deformation exerted is not such that that Band is brought to the desired shape by plastic deformation alone. In other words, will the tape is not straightened or "bent over" beyond the required extent and is not so deformed that it takes on its desired shape permanently.

In practice it is only necessary to deform the band by placing an edge in line with stops is aligned; the edge straightening machine does not have to be set to the desired

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Degree of "overbending" is made to the desired Form to form, so that the above-mentioned problems can be avoided due to the constant new setting of the edge straightener. The tape is temporarily held in the desired shape while it is is deformed; This deformation "solidifies" the band in the desired shape.

When the method according to the invention is used in the manufacture of a side part of a chassis it is usually necessary to make holes in the side part; doing so can be in the order of magnitude of 350 holes in each side panel, which are arranged with very tight tolerances have to. Therefore, if the part has to be punched, the band is elastically deformed before deformation (like it is defined here) while it is flat so that its edges take the shape desired; Then it will be perforating the tape while maintaining it in its elastically deformed state.

The perforation of the tape is normally not carried out in the device in which the folded edges are made be formed; so when the band is no longer under the influence of the form force, it will take on its curved shape again; the holes that have been punched are not in this state in their tolerances; However, if the band is elastically deformed again before the deformation, the Holes in their desired positions and are "frozen" in these positions if the edge or edges are bent over or edges are formed.

The tape can also be adjusted to a desired one prior to the formation of the curved edge or edges Shape can be sheared off while it is elastically deformed

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so that its edges assume the desired shape.

The tape can be used for punching and / or shearing

be elastically deformed by wedges, which on a

Edge of the tape act against its other edge

pushes a series of stops. :

When carrying out the method according to the present invention, the folded edge (or the folded over Edges) can be formed by cutting the tape using a punch is pressed into the cavity of a molding die; the tape is elastically deformed so that its edges immediately take on the desired shape before the formation of the or the bent edge or edges by they are pressed by the punch between inclined surfaces at the entrance to the cavity of the Form die are provided. If the tape is to be provided with holes, you can also do this during the punching Multiple editing holes can be formed in the tape, which will guide the positioning of the tape during support the formation of the bent edge or edges "

When inserting the mold cavity and punch, the punch can be provided with a plurality of tapered pins which are arranged so that they penetrate the machining holes in the strip; when the punch penetrates the forming die, assist these editing holes allow the elastic deformation of the strip to the desired shape.

The invention also provides an apparatus for producing an elongate part with at least a »bent edge made of a flat, rolled metal strip with a die with a mold cavity and a punch that is used to manufacture the finished

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Can be pushed in part in the cavity; the cavity is at its entrance with inclined surfaces provided, while the punch is provided with a positioning device that acts on the tape, so that the band is elastically deformed (as defined herein) as the band makes its way into the cavity is pressed between the inclined surfaces so that its edges just prior to the formation of the bent edge or the bent edges in the cavity assume the desired shape.

As described above, the positioning device have a plurality of tapered pins on the punch, which are arranged so that they in penetrate the machining holes in the tape.

The invention is described below using an exemplary embodiment with reference to the enclosed, schematic drawings explained in more detail.

Show it:

Figure 1 is a diagram of a curved rolled strip such as that shown in FIG is received by the rolling mill;

Fig. 2 is a diagram for explaining how the tape deforms elastically in its flat state can be;

Fig. 3 is a diagram showing the shape of a wedge which

can be used to straighten the edge;

Fig. K is a diagram showing the tape in its Position in which it is with the bent over Edges can be formed;

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Figure 5 is a diagram of the tape after it has been formed with the edges turned back, so that it is U-shaped;

Fig. 6 is a section through a device with which the edge of the tape is straightened and the Tape can be sheared off in its flat shape; and

7 shows a cross section through a mold or a punch with which the band with a U-cross section can be provided.

1 shows a strip or band 10 which is made of steel and has been rolled in the direction of the arrows 11. The tape has opposite edges 12 and 13 which define the width of the tape and, as will be explained below, are curved or curved. In other words, the edges 12 and 13 are arcuate; Although the curvature and proportions of the band are exaggerated in the figure, the following can be seen: In order to obtain a straight band, as indicated in Ik with dashed lines, a curved band must necessarily be used, the length and width of which is greater than are necessary in practice. However, there would not be such a large loss as shown in FIG.

The following is the mode of operation of the invention Procedure are explained; the tape 10, from which a side part for a truck chassis or chassis is to be produced, is arranged with its edge 12 aligned with stops 15, as shown in Fig. 2; by means of wedge parts 16 a pressure is applied to the edge 13 in the direction of the arrow «

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17 exercised. This pressure is designed to straighten the tape and to engage the edge 12 with all of the stops gen 15 is brought, which - in the present embodiment - Are arranged so that the edge 12 is straight. One of the wedge parts l6 is shown in Fig. 3 shown; it can be seen that there is an inclined surface 18 and a perpendicular surface 19 has. The inclined surface is first brought into engagement with the belt 13 when the wedge member l6 is moved downward, and then the vertical surface engages the rim 13 and is straightened finally the tape.

The band 10, which is in the state shown in Fig. 2, is elastically deformed, i.e. when the wedges 16 were removed, so would that The tape will essentially return to the shape shown in FIG. There can be a certain amount of it plastic deformation occur, so that the tape does not spring back exactly to the shape shown in FIG would; however, the tape would not be in its rectilinear shape shown in FIG would remain if the wedges 16 were removed.

While the tape is in its rectilinear shape shown in Figure 2, it is pierced or perforated. Several tool or tool shown at 20. Machining holes will be in the middle of the belt formed, for example punched out, and have a comparatively large diameter. When out If a side part is to be made on the band, a relatively large number of others will be included in the band Holes drilled; this can be up to 350 such holes, which are, however, not shown. The tape is pierced while it is elastically deformed to its rectilinear shape.

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The wedges are then removed so that the band "springs back" essentially to the shape shown in Figure 1; then the band is brought to a press where it is deformed; in the present exemplary embodiment, it is given a U-shaped cross section. This is shown in FIGS. K and 5.

In the figures, k and 5, a punch or a punch 21 and a die or a mold 22 can be seen. The punch has a plurality of pegs arranged along its length; one of these pins is indicated at 2la; the pins have tapered ends. The tape 10 is placed on the mold between inclined surfaces 23 at the entrance to the mold cavity 22a. The band 10 is then in its curved shape, shown substantially in FIG. When the punch 21 of the molding press moves down, the pins 21a penetrate the machining holes 20 and the tapered pins and inclined surfaces 23 act to straighten the belt 10 when it is between the inclined surfaces 23 moved down onto shoulders 24; then the punch 21 can process the strip so that a part with a U-shaped cross-section is produced, as shown at 25; this part has two longitudinally extending, bent-over edges or flanges 26. The strip is aligned in a straight line by the combined effect of the surfaces 23 and the pins or pins 21a penetrating into the machining holes 20. Investigations have shown that such a deformation "freezes" the tape in its rectilinear shape.

While the band is in its flat, in Fig. 2

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is in the form shown, it can be sheared off if necessary. This is shown in detail in FIG. In this figure, the band is again indicated at 10, while the stops against which it is pressed are indicated at 15. The stops are formed by blocks that are screwed into a U-profile or a channel 27 in a carrier 28. The wedge part indicated at 16 has an inclined surface 18 and a vertical surface 19. The wedge part 16 is mounted on an upper support 29 which can be moved perpendicularly relative to the lower support 28. A spring-mounted plate 30 is supported by the upper support 29; that is, when the upper beam 29 moves downward, the plate JO engages the upper surface of the belt 10 and holds it down on the lower support surface 31. When the upper beam 29 moves downward, the inclined surfaces 18 of the Wedges 16 first engage the right edge of the belt and push its left into engagement with the stops 15. If the edges 19 of the wedge parts are in engagement with the right edge of the belt, then this is straight. In the arrangement shown in Figure 6, a cutting part 32 with a cutting edge 33 is also attached to the upper support 29; as soon as the band has been straightened, this cutting part 32 cuts the band at the edge Jk , as indicated in FIG. 6; the cut portion of the tape is shown at 35.

A number of such wedges, such as wedge 16, are spaced along the belt; In addition, several stops such as stop 15 ″ are provided; the cutting parts 32 cut however, the tape is only removed in the desired places, usually at the ends.

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7 shows in detail the structure of the press according to FIGS. 4 and 5 in a section which does not show the pins 21a. In Fig. 7, the same reference numerals as in Figures k and 5 have been used; a further explanation of the functioning of this press part should not be necessary.

Although the invention has been described with reference to the manufacture of a rectilinear part, it can of course also be used to manufacture parts that are not straight; it only has to be assumed that their deviation from the rectilinear form, or the initial form of the Blank, is such that it can be elastically deformed in order to prevent it from being pierced and / or deformed to bring into the desired shape.

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Claims (11)

Claims ! 1. 'Process for producing an elongated part from a flat, rolled metal strip, characterized in that the Band (10) is elastically deformed (as defined herein) while it is flat so that its edges (12, 13) assume the desired shape, and that the band (10) with at least one bent edge is formed while the baid (10) is held in its elastically deformed state. 2. The method according to claim 1 for forming a pierced, elongated part, characterized in that that before the formation of the bent edge, the band (10) is pierced while it is elastic is deformed so that its edges (12, 13) assume the desired shape. 3. The method according to any one of claims 1 or 2, characterized in that before the formation of the bent The edge of the tape (10) is sheared into the desired shape while it is elastically deformed, so that its edges (12, 13) have the desired shape accept. 4. The method according to any one of claims 2 or 3 «characterized in that the tape (10) in the desired Shape for piercing and / or shearing is deformed by wedges (l6) which are placed on an edge of the Acting band (10), which presses the other edge of the band (10) against a series of stops (15). 5. Method according to one of claims 1 to 4, characterized characterized in that the bent edge is formed 709830 / 03U - ORIGINAL INSPECTED 2 7 ü 2 A 7 is by the tape (10) using a punch (21) in a cavity (22a) of a molding die (22) is pressed, wherein the band (10) is elastically deformed so that its edges (12, 13) the desired shape immediately before the design of the bent-over edge or edges assume by being pressed by the punch (21) between inclined surfaces (23) attached to the Entrance to the cavity (22a) of the molding die (22) are provided. 6. The method according to claim 2, characterized in that that the perforation and the design of the bent edge take place in different devices, wherein the band (10) is released from its elastically deformed state after completion of the perforation and is then elastically deformed again before the configuration of the at least one bent-over edge. 7. The method according to claim 6, characterized in that that several machining holes (20) are drilled into the band (10) during the punching, and that these Holes (20) are used to fix the tape (10) during the design of the or to support the bent edge or edges. 8. The method according to any one of claims 5 and 7, characterized in that the punch (21) with several, tapered pins (21a) are provided which are arranged to penetrate into the machining holes (20) in the band (10), and that these pegs (21a) support the elastic deformation of the band (10) to the desired shape, when the punch (21) penetrates the forming die (22). - 15 - 709830/0343 - vr-Λ ' 9. The method according to any one of claims 1 to 8, characterized characterized in that the at least one folded edge is formed so that it is substantially in the rolling direction or in the direction of the Walζgefügeβ of the belt (10) runs. 10. Apparatus for producing an elongated part with at least one bent edge a flat, rolled metal strip with a die with a mold cavity and a punch, which is pressed into the cavity to form the finished part, characterized in that the Mold cavity (22a) is provided with inclined surfaces (23) at its entrance, and that the punch (21) is provided with a positioning device (21a) which acts on the belt (10) so that the Band (10) is elastically deformed (as defined here) when the band (10) is inclined between the Surface (23) is pressed on its way into the cavity (22a) so that its edges (12, 13) immediately before the formation of the bent edge (26) in the cavity (22a) the desired Take shape. 11. The device according to claim 10, characterized by that the positioning device on the punch (21) has a plurality of conically tapering pins (21a), which can penetrate into machining holes (20) in the band (10). 709830/0343