EP1629905B1 - Method and device for joining two parts - Google Patents

Abstract

The fixing process involves producing fixing sectors by means of a punch (1). The punch is pressed from one side against one of the fixing sectors, so that the fixing sector under pressure from the punch is pressed into the adjacent fixing sector lying against it. During this process, the fixing sectors are partly pierced. The punch used has at least one separating region (8) and at least one connecting region (9).

Description

The invention relates to a method and a device for fixing superimposed or adjoining fixing sections of at least two parts, in particular sheet metal parts, relative to each other, wherein the fixing sections are deformed by a punch.

A generic method and a generic device as defined in the preambles of the independent claims are known from the document " Protective conductor connection in Druckfugetechnik ", Facklam T., Electrotechnical magazine-ETZ, VDE Verlag GmbH Berlin, Bd.109, No.24, 1988 , known.

From the German patent application DE 199 29 375 A1 a method for enforcing joining successive thin plates or plate sections is known in which superimposed surface parts of the plates are pulled together deep into a deep-drawn hole and the deep-drawn surface parts are squeezed wide, limiting the expansion in opposite transverse directions and in the deep drawing direction. For positively locking hooking of the plates, the deeply drawn and crushed surface part of a second or overlying plate engages behind the first lowermost plate. Under plastic deformation of the plate material creates a joint joint. During the squeezing process, front edges of recesses which point in the direction of the surface part engage in the surface part on the bottom surface of the deep-drawing opening and hinder it from flowing radially outwards. Displaced material flows from the second or overlying surface part into the resulting radial free spaces. From the German Offenlegungsschrift DE 103 15 718 A1 is a device having a arranged on a press device, a deep-drawn opening having die and a driven in the direction of die forming die for rivet-like joining of components with at least a plate known. The device has a radial distance between the side walls of the deep-drawing opening and the lateral surfaces of the forming punch for receiving the displaced during the joining process plate material. The deep-drawn opening is formed in the die in the radial and axial directions as a blind opening, the side walls, as the radial outer surface of the forming die in the same direction of movement and as the bottom of the thermoforming hole are intrinsically intrinsically. The side walls of the deep-drawn opening and / or the lateral surfaces of the forming punch have a profiled cross-section. The settlement of these side walls or lateral surface is in each case longer than the settlement of a possible circle located within the same area. In the known methods and devices, relatively large pressure forces, which are needed to make the material to flow.

The object of the invention is to provide a method and a device for fixing superimposed or adjoining fixing sections of at least two parts relative to each other, wherein the fixing sections are deformed by a punch, which can be realized inexpensively in a simple manner, and Nevertheless, a release of the fixing of each other, at least in the short term, safely prevent.

The object is achieved by a method according to claim 1. It is achieved by the method according to the invention that the fixing sections engage in one another without material compaction or flow or deep drawing of material in a die arranged opposite the punch. This provides the advantage that significantly lower forces must be applied to the stamp in the inventive method than in the known methods.

The fixing sections have areas which, although acted upon by the punch, are not severed. In these areas, the connection of the fixing remains on the associated parts. Therefore, these areas are referred to as connection areas.

A fixing portion is partially pressed out of the surface of the fixing portion by the punch. This ensures that the fixing engage each other.

The fixation sections to be fixed relative to one another are arranged between the stamp and a counter holder. The anvil only serves to hold the parts in position when the punch is pressed against the fixing portions. The anvil does not perform the function of a die or a die.

The above object is also achieved by a device according to claim 2. The separation area of the stamp ensures that the fixing sections are partially severed. The connection area of the punch serves at most to deform the fixing sections, but not to cut through.

A preferred embodiment of the device is characterized in that the end face of the punch in the connection area is not continuous, but interrupted. This ensures that the stamp in the connection area, if at all, only later and less strongly comes into contact with the respective fixing section.

A further preferred embodiment of the device is characterized in that the stamp has substantially the shape of a circular cylinder. The circular cylinder has a circular end face, which is interrupted in the connection region, for example by a depression.

A further preferred embodiment of the device is characterized in that the punch has a bevelled surface. The beveled surface breaks the end face of the punch to create the bonding area.

A further preferred embodiment of the device is characterized in that the stamp has substantially the shape of a cuboid. The cuboid has a rectangular end face, which is interrupted in the connection region, for example by a depression.

A further preferred embodiment of the device is characterized in that the end face of the punch has a notch. Through the notch, which is preferably formed continuously, the end face of the punch is interrupted to provide the connection area.

According to the invention, the punch cooperates with a counter-holder which has a receiving opening for the punch whose dimensions are slightly larger than those of the punch. This ensures that the fixing sections do not come into contact with the counter-holder when they are deformed.

Figur 1

eine perspektivische Darstellung eines Form- und Trennstempels gemäß einem ersten Ausführungsbeispiel;

Figur 2

eine Seitenansicht des Form- und Trennstempels aus Figur 1;

Figur 3

eine Schnittdarstellung von zwei aneinander anliegenden Blechteilen beim Verformen mit einem Form- und Trennstempel, wie er in den Figuren 1 und 2 gezeigt ist;

Figur 4a

eine perspektivische Darstellung eines Form- und Trennstempels gemäß einem zweiten Ausführungsbeispiel;

Figur 4b

eine perspektivische Darstellung eines Form- und Trennstempels gemäß einer Variante des zweiten Ausführungsbeispiels;

Figur 5

zwei aneinander anliegende Blechteile beim Verformen mit einem Form- und Trennstempel, wie er in Figur 4 gezeigt ist;

Figur 6

eine perspektivische Darstellung eines Form- und Trennstempels gemäß einem dritten Ausführungsbeispiel und

Figur 7

eine Seitenansicht des in Figur 6 dargestellten Form- und Trennstempels.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail. Show it:

FIG. 1

a perspective view of a forming and separating punch according to a first embodiment;

FIG. 2

a side view of the mold and release stamp FIG. 1 ;

FIG. 3

a sectional view of two abutting sheet metal parts when deformed with a forming and separating stamp, as in the Figures 1 and 2 is shown;

FIG. 4a

a perspective view of a forming and separating punch according to a second embodiment;

FIG. 4b

a perspective view of a forming and separating punch according to a variant of the second embodiment;

FIG. 5

two abutting sheet metal parts when deformed with a forming and separating stamp, as in FIG. 4 is shown;

FIG. 6

a perspective view of a forming and separating punch according to a third embodiment and

FIG. 7

a side view of the in FIG. 6 illustrated mold and release stamp.

In the Figures 1 and 2 a forming and separating stamp 1 is shown in different views. The forming and separating stamp 1 essentially has the shape of a circular cylinder 3, which is shown cut off at one end 4. At the other end 8, the end face of the circular cylinder 3 is divided into a separation area 8, which has substantially the shape of a semicircle, and a connection region 9, which is bevelled. The circular cylinder 3 preferably has a thickness of 1.0 to 1.5 mm.

In FIG. 3 is the forming and separating stamp 1 from the Figures 1 and 2 shown in the deformation of two sheet metal parts 11 and 12. The forming and separating punch 1 cooperates with a counter-holder 15, which has a bore 17 whose diameter is slightly larger than the outer diameter of the forming and separating punch 1. The forming and separating stamp 1 is immersed with its end 6 in the sheet metal part 11, that the sheet metal part 11 is pressed in the region of the engagement surface of the forming and separating punch 1 in the sheet metal part 12. The immersion depth, the dipping speed, the stamp shape, the hardness and the thickness of the material and the surface of the punch affect the deformation. The stamping ensures that the otherwise incurred during punching waste remains attached to the sheet metal parts.

Through the separation region 8 of the forming and separating stamp 1, the material of both sheet metal parts 11 and 12 was partially severed. By connecting region 9 of the forming and separating stamp 1 it is achieved that the severed portions of the sheet metal parts 11 and 12 remain connected to the respective sheet metal parts.

In FIG. 4a a punch 21 is shown, which essentially has the shape of a cuboid 23. One end 24 of the cuboid 23 is shown cut off. The end face on the other end 26 of the cuboid 23 has two separating regions 27, 28, which are separated by a notch 29. The notch 29 is formed by two connecting surfaces 31, 32, which are arranged at an angle of approximately 100 ° to each other.

In FIG. 4b is a flat punch 21 'is shown, which has only one separation area 28'. The punch 21 'has a chamfered surface 32' whose helix angle is about 45 degrees. The thickness of the flat punch 21 'is 1.0 to 1.5 mm. Due to the only one-sided separation area unwanted deformations in the point area can be avoided.

In FIG. 5 it can be seen that the mold and separating punch 21 cooperates with a counter-holder 35, which has a substantially rectangular recess 37 whose dimensions are slightly larger than the outer dimensions of the forming and separating punch 21.

Through the two separation areas 27, 28 two sheet metal parts 11 and 12 are severed at two points, as in punching. By the connection surfaces 31, 32, which form the notch 29, the material remains attached to the sheet metal parts 11 and 12. There is no waste, as usual when punching.

In the FIGS. 6 and 7 another embodiment of a forming and separating punch 41 is shown, which has the shape of a circular cylinder 43 substantially. The circular cylinder 43 is in the FIGS. 6 and 7 shown cut off at one end 44. The end face on the other end 46 of the forming and separating punch 41 has two separating regions 47, 48, which are divided by a notch 49.

Claims (7)

1. A process for joining relative to one another joining sections of at least two parts (11, 12), in particular plate parts, lying on top of or adjacent to one another, the joining sections being shaped by a stamp (1; 21; 41), said stamp (1; 21; 41) being pressed against one of the joining sections from one side in such a manner that the joining section hit by the stamp is pressed into the joining section next to it and the joining sections are partially cut through, the joining sections having areas which although hit by the stamp (1; 21; 41) are not cut through, one joining section being pushed partially out of the surface of the joining surface by the stamp (1; 21; 41) and the joining sections to be joined relative to one another being positioned between the stamp (1; 21; 41) and a pressure pad (15;35),
   characterised in that
   the stamp (1; 21; 41) co-operates with a pressure pad (15;35) which has a receiving opening (17; 37) for the stamp with dimensions which are somewhat greater than those of the stamp in such a manner that the joining sections are forced into one another without any material compression taking place.
2. A device for joining relative to one another joining sections of at least two parts (11, 12), in particular plate parts, lying on top of or adjacent to one another, said fixing sections being shaped by a stamp (1;21;41) in accordance with a process as disclosed in one of the preceding claims, said stamp (1; 21; 41) having at least one separating area (8; 27, 28; 47, 48) and at least one connecting area (9; 31, 32; 49),
   characterised in that
   the stamp (1; 21; 41) co-operates with a pressure pad (15;35) which has a receiving opening (17; 37) for the stamp with dimensions which are somewhat greater than those of the stamp.
3. A device in accordance with claim 2,
   characterised in that
   in the connecting area (9; 31, 32; 49) the front face of the stamp (1; 21;41) is not continuous but broken.
4. A device in accordance with claim 2 or 3,
   characterised in that
   the stamp (1; 41) is essentially the shape of a regular cylinder.
5. A device in accordance with claim 4,
   characterised in that
   the stamp (1) has an angled face (9).
6. A device in accordance with claim 2 or 3,
   characterised in that
   the stamp (21) is essentially cuboid in shape.
7. A device in accordance with one of claims 4 to 6,
   characterised in that
   the front face of the stamp (21; 41) has a notch (29; 49).

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