EP3241628A1 - Method and device for producing a strip with protrusions - Google Patents

Abstract

Method for producing a cam strip, comprising the following steps: - A metal strip is embossed with a first punch (1, 1.1) and at least one further parallel punch, so that on the stamps (1, 1.1) side facing a recess is formed and on the stamps (1, 1.1) facing away each a cam is pushed out, wherein the punches (1, 1.1) each consist of a base (2) and each a part-conical shoulder (4), wherein the punches (1, 1.1) have a total height of 7.6 mm and the base (2) have a height (h2) of 7.1 mm and the shoulder (4) have a further height (h1) of 0.5 mm and are arranged at an angle of 45 ° to the base (2), with the Shoulder (4) a stamp surface (3) is formed, wherein the stamp surface (3) has a diameter of 6.55 mm and the first punch (1, 1.1) to the further punch has a first distance, - The two parallel punch (1, 1.1) are pressed into the metal strip, whereby the first cam and the second cam are embossed in the metal strip, wherein between the first and the second cam, there is a further distance, which is substantially the first Distance equals, - the metal strip is moved - The two parallel punch (1, 1.1) are pressed in a further step in the metal strip, so that one of the two punches (1, 1.1) pressed into the other section, so that a third cam between the first cam and the second cam coined becomes.

Description

The invention relates to a method for producing a cam strip according to the preamble of claim 1 and a device according to the preamble of claim 4, as well as a stamp according to claim 6.

STATE OF THE ART

In the prior art, cam strips are produced by complex cold forming processes. These cam strips are used in the automotive industry as screening.

A disadvantage of the cam strip of the prior art is the cost-intensive production.

OBJECT OF THE INVENTION

The object of the invention is to provide a cam strip available, which is cheaper to produce and in addition less rejects produced.

SOLUTION OF THE TASK

To achieve the object, the features according to claims 1, 4 and 6. Advantageous embodiments can be found in the subclaims.

A method according to the invention for producing a cam strip is characterized in that a metal strip is stamped with a stamp in such a way that an indentation is created on the side of the metal strip facing the stamp and a cam is pushed out on the side facing away from the stamp. The metal strip may consist of steel, aluminum or another metal material.

The cam strip is used in the automotive industry as a lock, especially in vehicle seats.

The metal strip preferably has a material thickness of 7 to 13 mm, particularly preferably 10 mm. The information varies depending on the alloy and the material used.

Preferably, the punch consists of a pedestal and a shoulder, wherein the pedestal substantially has a height of 7.1 mm and a diameter of substantially 7.55 mm. The shoulder has a further height of 0.5 mm substantially. The shoulder is designed as a chamfer and forms a partial cone shape with the stamp surface.

The shoulder is arranged at an angle of 45 ° to the base, in particular to the base collar. The stamp surface has a diameter of 4.5 mm. The dimensions given may vary up to +/- 10%.

In the production method according to the invention, first a first cam and a second cam are impressed into the metal strip. This is done by two stamps according to the invention arranged parallel to one another in a punching or fine blanking device. The two punches have a first distance. After the first cam and the second cam have been pressed into the metal strip, a further distance arises between the first cam and the second cam. The further distance essentially corresponds to the first distance between the two punches. In a further step, the metal strip is displaced, so that one of the two punches lies above the further distance. In the next step, the two punches are pressed again into the metal strip. This creates a third cam between the first cam and the second cam. In addition, there is also a fourth cam, which is stamped either next to the first cam or next to the second cam depending on the direction of displacement of the metal strip.

The number of juxtaposed stamps is arbitrary and depends on the number of desired cams or the length of the strip of material. In a preferred embodiment, there are five punches.

Throughout the embossing process, on the metal strip, on the other side of the die, a negative mold is provided for each of the dies, which has a rectangular shape in which the shorter edges of the rectangular shape are formed in convex semicircles from a center of the metal strip, so that during the embossing process resulting cam correspond to the negative mold.

This process can be repeated as often as required to rework different lengths of metal strip into a cam strip.

According to the inventive method, the stamp used has a total height of 7.6 mm, wherein the stamp is pressed up to 6 mm in the metal strip. The depth of penetration is determined by the material used, its compensation and the material thickness.

An inventive device for producing a cam strip from a metal strip has at least two punches, wherein the metal strip has a material thickness of 7 mm to 13 mm, preferably 10 mm. The stamp consists of a base and a stamp head, wherein the base has a height of preferably 7mm to 8 mm and more preferably 7.1 mm and a diameter of 7 mm to 8 mm and more preferably 7.55 mm.

At the base of a part-conical shoulder is arranged. The shoulder has a further height of substantially 0.3 to 1 mm, but particularly preferably 0.5 mm. The shoulder is arranged at an angle of 45 ° to the base, in particular on a base collar. The shoulder has a stamp surface on the other side of the base. The diameter of the die surface preferably has a diameter of 6 to 7 mm, but particularly preferably a diameter of 6.55 mm. The base is arranged at an angle of 2 ° to 4 °, but more preferably 2.8 ° obliquely to a base base. The base bottom is the end of the stamp facing away from the stamp surface.

Another embodiment of a stamp according to the invention differs by a three-part, but one-piece construction.

First, a mounting base and a middle part and a stamp head is present. The mounting base serves to receive in a processing tool or processing machine not shown in detail. The mounting base in turn consists of a ring, wherein a flat cone extends on the side facing away from the central part of the ring. On the flat cone opposite side of the ring extends a cone, which merges into the cylindrical Mitteilteil. The middle part has a diameter of 10 mm.

At the other end of the cone adjoins the middle part of the stamp head, wherein a partial circumference of the punch head tapers conically up to the stamp surface. In particular, the partial circumferential region is straight around a recess and does not run conically.

As regards the conical taper of the punch head, the punch head has a diameter of 8.3 mm in the area of the middle part. In the area of the stamp surface, the stamp head now has a diameter of 7.55 mm. Thus, a not shown in detail angle between the two diameters 5.65 °.

The stamp surface tapers off the shoulder again conically away from the stamp head. As mentioned above, the stamping surface has a diameter of 6.55 mm. In this case, the angle between the punch head and the stamp surface 45 °.

The punch has a total height of 47 mm, wherein the punch head and the punch surface together have a height of 12.2 mm and the middle part with the mounting base together have a height of 34.8 mm. Final dimension when installed is 46.5 mm.

The recess is formed in the region of the mounting base and the middle part as a partial slot. In the region of the stamp head, the recess V-shaped runs together. Above the recess, a nose is formed.

DESCRIPTION OF THE FIGURES

Figur 1

eine Seitenansicht eines erfindungsgemässen Stempels;

Figur 2

eine Seitenansicht eines weiteren Ausführungsbeispiels eines erfindungsgemässen Stempels;

Figur 3a und 3b

eine um 90° gedrehte andere Seitenansicht des Stempels nach Figur 2;

Figur 4

eine vergrösserte Teilansicht des Stempels in Figur 2.

Figur 5

eine schematische Ansicht eines Herstellungsverfahrens.

Further advantages, features and details will become apparent from the following description of an embodiment with reference to the following figures. These show in detail

FIG. 1

a side view of a punch according to the invention;

FIG. 2

a side view of another embodiment of a punch according to the invention;

Figure 3a and 3b

a rotated by 90 ° other side view of the stamp after FIG. 2 ;

FIG. 4

an enlarged partial view of the stamp in FIG. 2 ,

FIG. 5

a schematic view of a manufacturing process.

In the figure, a side view of a punch 1 according to the invention is shown. The punch 1 consists primarily of a base 2 and a shoulder 4. On the shoulder 4, a stamp face 3 is arranged on the other side of the base 2.

The shoulder 4 has an angle α of 45 ° to a base collar 5. The shoulder 4 is designed as a chamfer. In this case, the shoulder 4 preferably has a height h1 of substantially 0.5 mm. The base 2 has a further height h2 of preferably substantially 5.75 mm. The total height of the base 2 with the shoulder 4 is then substantially 7 mm. The base 2 essentially has a diameter of 7 mm.

The base wall 6 is arranged at an angle β of preferably 3 ° to a base bottom 7.

The stamp surface 3 has a diameter d1 of 6.55 mm. In this case, the stamp surface 3 is circular in the embodiment shown.

In another embodiment, the stamp surface 3 consists of two semicircular ends, which are each connected to each other via two parallel lines and thereby forms the shape of a rectangle whose shorter edges are semicircular.

The stamp 1 shown here is used in a device according to the invention. In addition, the stamp 1 can also be used in the inventive method.

The FIGS. 2 to 4 show a view of another inventive embodiment of a stamp 1.1. This embodiment differs in a three-part but one-piece construction.

First, a mounting base 8 and a central part 9 and a stamp head 10 can be seen. The mounting base 8 serves to receive in a machining tool or processing machine not shown in detail. The mounting base 8 in turn consists of a ring 11, wherein a flat cone 12 extends on the side facing away from the central part 9 of the ring 11. On the opposite side of the flat cone 12 of the ring 11 extends a cone 13, which merges into the cylindrical Mitteilteil 9. The middle part 9 has a diameter d2 of 10 mm.

At the other end of the cone 13 adjoins the central part 9 of the stamp head 10, wherein a partial circumference 14 of the punch head 10 tapers conically up to the stamp surface 3. In particular, the partial circumferential region 15 is straight around a recess 16 and does not run conically.

As regards the conical taper of the stamp head 10, the stamp head 10 has a diameter d3 of 8.3 mm in the region of the middle part 9 on. In the area of the stamp face 3, the stamp head 10 now has a diameter d4 of 7.55 mm. Thus, a not shown in detail angle between the two diameters d3 and d4 5.65 °.

The stamp surface 3 tapers off the shoulder 4 again conically away from the stamp head 10. As already mentioned above, the stamp surface 3 has a diameter d1 of 6.55 mm. In this case, the angle α between the punch head 10 and the stamp surface 3 45 °.

The punch 1.1 has a total height h3 of 47 mm, wherein the punch head 10 and the punch surface 3 together have a height h4 of 12.2 mm and the middle part 9 with the mounting base 8 together have a height of h5 34.8 mm. Final dimension when installed is 46.5 mm.

The recess 16 is formed in the region of the mounting base 8 and the central part 9 as a partial slot. In the region of the punch head 10, the recess 16 is V-shaped. Above the recess 16 is, as in particular in FIG. 3b Visible, a nose 17 formed.

In FIG. 5 an advantageous manufacturing method in the form of a three-stage impression of the sliding surfaces of the cam strip is shown in a particularly advantageous embodiment. In addition, a reduction in material thickness of up to 5% was achieved. This achieved a more accurate parallelism and evenness.

This results from the first two work sequences. Initially, elevations were applied in the tool area on the die side. Next, the production time was shortened in the Gleitflächenbereich by impressing on the tool guide plate with hydraulic power and blocking the tool from the direction of the tool shell.

In the third sequence, the exact sliding surface area is secured by holding and stamping on cutting the cam strip. This is achieved primarily by acting on the tool ejector in the direction of the force exerted by the hydraulic force on the tool ejector, the sliding portions being simultaneously applied as an elevation. The corresponding force direction is indicated by the 1st arrow F1.

Further, in the area of the edge indentation of the cam strip, the holder for an accurate part outer shape is indicated by the arrow F2. The total width of the cam strip is indicated by the arrow F3 secured to ensure this work.

Position Number List

1. stamp Second base Third stamp surface 4th shoulder 5th base collar 6th base wall 7th base shelf 8th. fixing floor 9th midsection 10th ram head 11th ring 12th flat cone 13th cone 14th partial circumference 15th Partial circumferential region 16th recess 17th nose h1 height F1 - 1. arrow h2 height F2 - 2. arrow h3 height F3 - 3. arrow h4 height h5 height

Claims (10)

Method for producing a cam strip characterized by the following steps: - A metal strip is embossed with a first punch (1, 1.1) and at least one further parallel punch, so that on the stamps (1, 1.1) side facing a recess is formed on the side facing away from the punch (1, 1.1) Cams is pushed out, wherein the stamp (1, 1.1) each consist of a base (2) and each a part-conical shoulder (4), wherein the punch (1, 1.1) have a total height of 7 mm, while the base (2) a height (h2) of 7 to 8 mm, in particular 7.1 mm and the shoulder (4) have a further height (h1) of 0.3 mm to 1 mm, in particular 0.5 mm and at an angle of 45 ° are arranged to the base (2), wherein on the shoulder (4) a stamp surface (3) is formed, wherein the stamp surface (3) has a diameter of 6 mm to 7 mm, in particular 6.55 mm, wherein the first punch (1, 1.1) has a first distance to the further punch, - The two parallel pistons (1, 1.1) are pressed into the metal strip, whereby the first cam and the second cam are embossed in the metal strip, wherein between the first and the second cam, a further distance is present, - the metal strip is moved - The two parallel punch (1, 1.1) are pressed in a further step in the metal strip, so that one of the two punches (1, 1.1) pressed into the other section, so that a third cam between the first cam and the second cam coined becomes. A method according to claim 1, characterized in that the metal strip is provided in a material thickness of 7 mm to 13 mm, in particular of 10 mm. Method according to claim 1 or 2, characterized in that the punches (1, 1.1) have an overall height of 7 mm, the punches (1, 1.1) being pressed between 5 mm and 6.5 mm, particularly preferably 6 mm, into the metal strip becomes. Device for producing a cam strip from a metal strip with a first stamp (1, 1.1) and a further stamp, wherein the metal strip has a material thickness of 7 mm to 13 mm, preferably 10 mm, characterized in that each of the stamp (1) a base (2) and a shoulder (4), wherein the base (2) has a height (h2) of 7 mm to 8 mm, in particular 7.1 mm and a diameter of 7 mm to 8 mm, in particular 7.6 mm, and the shoulder (4) is a 0.3 mm to 1 mm high, in particular 0.5 mm high part cone shape, wherein the shoulder (4) is arranged at an angle of 45 ° to the base (2) the shoulder (4) on the other side of the base (2) has a stamp surface (3) with a diameter of 6 mm to 7 mm, in particular 6.5 mm. Apparatus according to claim 4, characterized in that a base wall (6) of the base (2) is arranged at an angle of 3 ° obliquely to a base base (7). Stamp for a device according to claims 4 and 5, characterized in that the punch (1, 1.1) consists of a base (2) and a shoulder (4), the shoulder (4) on the other side of the base (2) has a stamp surface (3), wherein the base (2) has a height (h2) of 7 mm to 8 mm, in particular 7.1 mm and a diameter of 7 mm to 8 mm, in particular 7.55 mm, and the partially conical shoulder (4 ) a further height (h1) of 0.3 mm to 1 mm, in particular 0.5 mm and a Diameter of 6 mm to 7 mm, in particular 6.5 mm, wherein the shoulder (4) is arranged at an angle of 45 ° to the base (2), wherein a base wall (6) of the base (2) at an angle from 2 ° to 4 °, in particular 2.8 ° obliquely to a base bottom (7) is arranged. Stamp according to one of claims 1 to 6, characterized in that a three-part one-piece construction is present, wherein first a mounting base (8), a central part (9) and a punch head (10) is present, wherein the mounting base (8) consists of a Ring (11), wherein a flat cone (12) on the side facing away from the central part (9) side of the ring (11) and extending on the flat cone (12) opposite side of the ring (11), a cone (13) , which merges into the cylindrical Mitteilteil (9). A stamp according to claim 7, characterized in that at the other end of the cone (13) adjoins the central part (9) of the punch head (10), wherein a partial circumference (14) of the punch head (10) tapers conically up to the die surface (3) and a partial circumference region (15) is formed around a recess (16), wherein the recess (16) in the region of the fastening base (8) and the central part (9) is formed as a partial slot and in the region of the punch head (10) is shaped together and wherein above the recess (16) has a nose (17) is formed. Stamp according to claim 8 or 9, characterized in that the central part (9) has a diameter (d2) of 10 mm and the punch head (10) in the region of the central part (9) has a diameter (d3) of 8.3 mm and in the region of Stamping surface (3) has a diameter (d4) of 7.55 mm, wherein angle between the two diameters (d3) and (d4) 5.65 °. A stamp according to one of the preceding claims, characterized in that it has a total height (h3) of 47 mm, the stamp head (10) and the stamp face (3) together having a height (h4) of 12.2 mm and the Central part (9) with the mounting base (8) together have a height of (h5) 34.8 mm, the finished dimension is 46.5 mm when installed.

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