Method and device for extrusion snap-in

Abstract

The invention provides a method and an apparatus for press snap-in. A mandrel (DO) is positioned below the first surface (Z1), said mandrel having a movable punch (ST) inside. A female mold (MT) is positioned over the second face (Z2), the female mold having a deep-drawn opening (T). The punch (ST) is moved along the surface normal to the two surfaces (Z1, Z2) in such a way that the material is displaced from the respective surfaces (Z1, Z2) into the deep-drawn opening (T), the deep-drawn and compressed surface portion of the first surface (Z1) clamping against the stationary portion of the second surface (Z2) in order to couple the two surfaces (Z1, Z2) in a form-fitting manner. The punch (ST) prevents the medium from flowing out of the channel (KA) within the mandrel (DO) until the pressure (D) of the medium acting on the punch (ST) is large so as to move the punch (ST).

Description

Field of the Invention

[0001] The present invention relates to a method and an apparatus for joining two simply curved surfaces of two components by throughput joining (Durchsatzfuegen), and to a heat exchanger comprising these two components. Background Art

[0002] It is known to braze or weld two simply curved surfaces of two components. For example, the first component can be a tube or a collector for a heat exchanger, and the second component can be a retainer. The heat exchanger can be fastened to the body of a motor vehicle, for example, by means of the retainer. The second component can have a curved surface that is inseparably connected to the first component. When using a welding method, an adverse heat input into the first and second components occurs. Generally, the two components are made of aluminum alloy. The good thermal conductivity of the aluminum alloy can result in the formation of a very wide heat-affected zone. In the heat-affected zone, the properties of the material are generally poor. Typical problems in the area of the heat-affected zone are: higher brittleness, welding cracks, internal stresses, reduced strength, and reduced corrosion resistance. This can result in the components failing during installation or operation and can lead to an unfavorably high scrap rate. When joining two components by a brazing method, such as hard soldering, a temperature input into the two components occurs in a brazing furnace. When joining two components in a brazing furnace, due to the temperature input during brazing, the strength of the materials of the two components can deteriorate in an adverse manner. By using a manufacturing method for the first component, such as extrusion, the strength of the finished tube is higher than the strength of the material in the initial state. When using a brazing method, this increase in the material strength of at least the first component is lost again. Furthermore, from the document DE 199 29 375 A1, a method and an apparatus for joining two superimposed thin flat plates or flat plate sections by throughput joining from above are known. In an unfavorable manner, the two curved surfaces of the two components cannot be joined to each other by the disclosed method and the disclosed apparatus. Summary of the Invention

[0003] In contrast, the advantages of the method according to the invention and the apparatus according to the invention with the features of the independent claims are that the two simply curved surfaces of the two components can be joined to each other, and a heat input into the two components can be avoided by the method according to the invention.

[0004] The starting point of the present invention is a method for clinching two components. Clinching is a method for joining at least two components. The two components can be, for example, sheet components, tubes, and / or profile components. The width and length of the components are respectively much greater than their thickness. A tube is an elongated hollow body. The length is much greater than the diameter and the wall thickness (thickness). Clinching belongs to the group of methods of splicing by modification. The device for clinching comprises a punch and a die. The components to be joined can have a first metal material that is plastically deformable. The die is rigid and has a deep-drawing opening, so that the two components form an overlap and a button-like shape, which connects the two components form-locking and force-locking. Plastic deformation is understood as a material property in which, after the elastic limit is exceeded under the action of a force, the material deforms irreversibly and retains this shape after the force action. Within the elastic limit of the material, when the load is removed, the component has its original shape again. The clinching method according to the present invention has the following steps: Position the two respectively simply bent surfaces of the two components in an overlapping manner. A simply bent surface is a surface that can be smoothly unfolded onto a flat plane without upsetting or pulling. Here, the simply bent surface can be the circumferential side surface of a hollow cylinder. The first component can be, for example, a tube or a half-tube. The second surface can be simply bent to respectively fit the first surface, so that an adaptation is formed between the two surfaces of the two components. It is possible that the two components respectively have aluminum alloy. The first component can be, for example, a seamless drawn tube or a fusion-welded tube made of aluminum. The second component can be a retainer made of aluminum. Here, the second component is positioned above the first component. The two surfaces are respectively simply bent, so that they can be superposed on each other without gaps. This can be achieved, for example, in such a way that the outer diameter of the tube corresponds to the inner diameter of the second surface of the retainer. A mandrel is positioned below the first surface, and the mandrel has a movable punch inside. For example, the mandrel can be represented by an elongated hollow cylinder. The first component and the mandrel can have a common central axis. In this way, the radial direction and the longitudinal direction can be defined. Below the first surface can be defined as being placed more radially inwardly. If the first component is a tube, the mandrel can be inserted into the tube. The punch required for clinching is arranged inside the mandrel, so that when the mandrel is positioned below the first surface, the punch cannot contact the first surface. Subsequently, the die is positioned above the second surface with the deep-drawing opening. The deep-drawing opening can have a circular shape with side recesses or a rectangular shape with side recesses. Then, move the punch along at least one of the surface normals of the two simply bent surfaces, so that the corresponding material is displaced from the corresponding surface into the deep-drawing opening. This method step can also be divided into additional sub-steps. The materials of the two components are respectively at least partially plastically modified here. The deep-drawing opening can have an upper contour and an annular channel on the punch side. In the first sub-step, the corresponding materials of the corresponding surfaces can sink and pass through the deep-drawing opening simultaneously. Then, the corresponding materials of the corresponding surfaces can be upset and widened.Subsequently, the upper contour of the deep-drawing opening can be filled, and then the annular channel on the punch side can be filled and flowed around laterally from the rear. Therein, a form-fitting hook-up of two surfaces is produced. The deep-drawn and squeezed surface portion of the first surface engages behind the stationary portion of the second surface. Then, the punch is moved back to its initial position. Subsequently, the female die and the mandrel are removed. By the method according to the invention, a button-shaped splicing connection part is manufactured. The two components can have a first metallic material, wherein the two components can each have a constant strength which can be higher than or at least equal to the strength of the two components before applying the method according to the invention, respectively. It is possible that an aluminum alloy is used as the first material. Strength is understood as the mechanical loadability of a component until component failure occurs. For example, fracture or excessive deformation of a component may cause such failure. Material-locking methods, such as fusion welding or soldering, affect the strength of the components at least in some areas. When two components are fusion-welded, an adverse heat-affected zone can be formed by the heat generated, in which the strength may be significantly reduced. If two components are connected by a soldering method, the strength of the two components may be reduced due to the heat of the soldering furnace. The reduction in the strength of the two components must be compensated again, for example, by an adverse increase in the wall thickness of the components.

[0005] Since, when using the method according to the invention, there is advantageously no heat input into the two components, the adverse formation of a heat-affected zone and the adverse reduction in strength can be avoided. Advantageously, by using the extrusion clinching method, the adverse stress concentration occurring in cutting methods can be avoided. For these reasons, a splicing connection part with a favorably high static and dynamic strength can be manufactured. By arranging the punch advantageously within a mandrel (which is positioned below the first surface) and positioning the female die above the second surface, accessibility on both sides is achieved, which is necessary for performing the extrusion clinching method. A particularly high strength of the splicing connection part can be achieved when the first component is thinner or softer than the second component, such that the first component can be formed better than the second component.

[0006] A preferred embodiment of the method according to the invention is characterized in that the punch prevents the medium from flowing out of the channel within the mandrel until the pressure of the medium acting on the punch is large enough to cause the punch to move. It is conceivable that the medium is compressed air. Alternatively, it is conceivable that the medium is hydraulic oil. The channel within the mandrel can be connected to a compressed air generator, such as a compressor. The punch can be supported in the channel such that the movement of the support along the length of the mandrel can be converted into the movement of the punch perpendicular to the mandrel. The mandrel can include a guide or channel to direct the medium to the punch. The face of the punch is loaded by the medium such that pressure acts on the punch and represents the desired movement. If the loading of the medium on the punch face is cancelled, then the pressure no longer acts on the punch and the punch returns to its initial position due to gravity. The channel in the mandrel can have a guide for the medium through which the face of the punch can be selectively loaded by the medium. Due to the advantageous arrangement of the movable punch within the mandrel, the punch required for the method can be positioned within the closed component. The movement direction of the punch and thus the splicing direction is directed from the inside out. If the first component is a closed tube, then the mandrel is inserted into the tube and then the punch moves by means of pressure.

[0007] Another preferred embodiment of the method is characterized in that a splicing connection site is formed in the case of at least partial plastic deformation of the materials of the two faces, which is at least partially present on and / or outside the two faces. As described above, the splicing direction of the method according to the invention is directed from the inside out. Due to the advantageous configuration of the splicing connection site at least partially on and / or outside the two faces, damage to the two components can be advantageously avoided when the mandrel is removed. Hook-up of the two components with the mandrel can also be avoided. Advantageously, the positioning of the mandrel can be carried out laterally or along an axis parallel to the two components. In this way, the process safety of the method according to the invention is also improved.

[0008] Another preferred embodiment of the method according to the invention is characterized in that the movement direction of the punch can extend substantially along at least one of the face normals of the two faces. A simply curved face can have a face normal. The face normal can be perpendicular to the simply curved face. If the face normals of the two faces and the movement direction of the punch are substantially consistent, then the positioning of the punch and the female die can be simplified and thus the process safety of the method according to the invention can be further improved. The deviation is basically understood as a possible length deviation of ±2 mm and / or a possible angle deviation of ±10°. This deviation can occur as a movement and / or a torsion.

[0009] A further preferred embodiment of the method according to the invention is characterized in that the first part can be a closed tube and the wall of the tube consists at least in part of a first face, wherein the tube and the mandrel are positioned such that their central axes are substantially identical. Since the central axes of the tube and the mandrel are identical, jamming or hooking can be avoided when moving the mandrel into and out of the closed tube. Since the punch required for the method according to the invention is arranged inside the mandrel and the required die is arranged above the second part and thus outside the tube, the method according to the invention can be used for closed tubes. Since the formed splicing point is at least partially outside and / or above the two faces, damage to the tube when the mandrel is removed from the tube can advantageously be avoided. Particularly preferably, the splicing point is outside the inner diameter of the tube. It is possible that the tube has a circular diameter. Alternatively, it is conceivable that the tube is constructed as a flat tube and has an oval cross-section.

[0010] A further preferred embodiment of the method according to the invention is characterized in that the die can be almost position-fixed and the volume of the deep-drawing opening can be unchangeable. Almost position-fixed is understood to mean that the die is almost immovable compared to the punch. In this way, simple geometries can be used for the punch and the deep-drawing opening respectively. The die can be positioned above the two parts in a simple manner and can also be used to clamp the two parts together. By the unchangeable volume of the deep-drawing opening, it can be ensured that the corresponding material of the corresponding face is almost completely pressed into the deep-drawing opening.

[0011] In a first embodiment according to the invention of a device for performing the method according to the invention, the channel has an opening for the outflow of the medium and is connected to a pressure generator. By the pressure acting on the punch, the punch can move. The medium can be compressed air compressed by the pressure generator. For example, the pressure generator can be a compressor. If the punch moves along its movement direction by the pressure acting on it, then the medium can flow under the punch and flow out of the mandrel through the opening. By the pressure of the medium, the punch can be held in the withdrawn position. When the pressure generator is switched off, the pressure is eliminated and the punch returns to its initial position due to gravity. The device according to the invention can have a support. The female die can be connected to the support by a mechanical structure such that the female die can sink onto two components and be removed again. The mandrel can be connected to the support by a mechanical structure such that the mandrel can be positioned under two surfaces. The mandrel can have a central axis. The first component can have a central axis. In this device, the first component can be clamped in a fixed position and the mandrel can be positioned under the first surface such that the central axes of the mandrel and the first component are at least substantially the same. The punch can have at least one movement axis. The punch can move along this movement axis. The movement axis of the punch can be perpendicular to the central axis of the mandrel. By this arrangement, the surface normal of the first surface of the first component coincides with the movement axis of the punch. The second component can be positioned above the first component such that the surface normal of the second surface coincides with the movement axis. The female die can be positioned above the two surfaces such that the two surfaces are at least pre-tensioned.

[0012] In a second embodiment according to the invention of the device, the punch can be rotatably supported in the channel. In this way it is possible that by the pressure acting along the central axis a movement of the punch perpendicular to the central axis and pointing outwards from the central axis along the movement axis of the punch is generated. In this way, the corresponding surface portions of the corresponding two surfaces can be formed into the deep-drawing opening by the punch and thus a splicing connection site is formed. The movement of the punch is hereby pointing from the inside outwards.

[0013] In a further embodiment according to the invention of the device, the mandrel can have a lateral opening through which the punch can move. The lateral opening can have an axis and it is possible that this axis coincides with the movement axis of the punch. The lateral opening can have a circular diameter. The diameter can be large enough such that the punch can move at least partially through the opening.

[0014] A further preferred embodiment of the device according to the invention is characterized in that the lateral opening of the mandrel can be fluid-technologically separated from the surroundings by the first surface. If the female mold is positioned above the two surfaces, a connection can be formed between the female mold and the first surface. Here, a force directed opposite to the splicing direction (directed towards the central axis of the mandrel) can be generated. By the pressing force generated by the female mold onto the first surface, the lateral opening can be fluid-technologically separated from the surroundings and thus sealed. The sealing can be further improved by at least one additional seal, for example by a rubber seal. Fluid-technological separation means that no medium or only a negligibly small amount of medium can pass through the connection.

[0015] In a further embodiment of the device according to the invention, the deep-drawing opening in the female mold can be configured as a blind hole in the radial and axial directions of the deep-drawing opening. Thus, the deep-drawing opening can be implemented such that it does not completely pass through the female mold. It is possible that the deep-drawing opening has at least one circular diameter, so that a circular dot-like splicing connection site can be produced. It is possible that the deep-drawing opening has a contour on its bottom in order to further improve the strength of the splicing connection site. Such a circular dot-like splicing connection site can have the same strength in all planes and can be airtight.

[0016] In a further embodiment of the device according to the invention, the punch can have a circular working pin that at least partially penetrates into the deep-drawing opening. The working pin can have a cylindrical shape or a conical shape. Since the deep-drawing opening can have a circular shape and the working pin can also have a circular shape, a circular dot-like splicing connection site can be produced. The strength of such a circular dot-like splicing connection site can be further increased, and the airtightness in the plane on the punch side and in the plane on the female mold side of the splicing connection site can be further improved.

[0017] In a first embodiment according to the invention, the heat exchanger can comprise at least two components that are interconnected by the method according to the invention. It is possible that the first component is a half-tube and the second component is a retainer. The heat exchanger can be connected to another component or to the body of a motor vehicle, for example, using the retainer. The circumferential side of the half-tube can be the first surface, and the retainer can have a second surface. The second surface of the retainer can be simply bent to fit the first surface (circumferential side), so that a fit is formed between the two surfaces. In this way, the half-tube and the retainer can be continuously interconnected by the method according to the invention. The half-tube can be manufactured, for example, by splitting a tube.

[0018] In a second embodiment of the heat exchanger according to the invention, the first component can be a tube and the second component can be a retainer. The heat exchanger can be connected, for example, to another component or to the body of a motor vehicle by means of the retainer. Here, the diameter of the tube can be greater than 20 mm. The tube can be a closed tube, which, for example, has an aluminum alloy and is drawn seamlessly. The heat exchanger according to the invention can have additional tubes, which can be flowed through by a second medium and can be loaded by a third medium, so that heat transfer can take place between the second medium and the third medium. The additional tubes can be shown as flat tubes, and corrugated ribs can be arranged between the flat tubes to increase the heat transfer area. The tube as the first component can be a collecting tube, through which the second medium can be distributed to the additional tubes and collected again. Alternatively, the heat exchanger according to the invention can be connected to a refrigerant circuit by means of a tube. The circumferential side surface of the tube can be a first surface, and the retainer can have a second surface. The second surface of the retainer can be simply bent to fit the first surface (the circumferential side surface of the tube), so that a fit is formed between the two surfaces. The tube and the retainer can be connected to each other by the method according to the invention, and thus the heat exchanger according to the invention has at least one splicing connection site. It is possible that more than two retainers are each connected to the tube by the method according to the invention, and thus the heat exchanger according to the invention has more than two splicing connection sites. By using the method according to the invention, it is possible to advantageously manufacture splicing connection sites, which have a higher static and dynamic strength. Since no or almost no heat is formed during the use of the method according to the invention, the adverse formation of heat-affected zones on the two components or the adverse reduction of the strength of the two components is avoided.

[0019] The refrigerant circuit for a motor vehicle according to the invention can have at least one heat exchanger according to the invention. The heat exchanger according to the invention can have tubes through which the refrigerant flows and which are loaded by another medium (such as air), so that heat transfer can take place between the refrigerant and the other medium. These tubes can be fluid-technically connected to two collectors in order to distribute the refrigerant to the tubes and collect it again. One of the two collectors is correspondingly the first component. Two holders each, as the second component, are connected to the collector by the method according to the invention. The heat exchanger according to the invention can be fastened to the body of the motor vehicle, for example, by the holders. The refrigerant circuit according to the invention can include the following components: a heat exchanger according to the invention as a condenser for condensing the refrigerant, a collector for collecting and storing the refrigerant, an expansion valve for decompressing the refrigerant, an evaporator for evaporating the refrigerant, a compressor for compressing the refrigerant, connecting lines. The refrigerant circuit according to the invention is flowed through by the refrigerant. It is conceivable that the refrigerant circuit is flowed through, for example, by R1234yf. Alternatively, it is possible that the refrigerant circuit is flowed through by carbon dioxide (R744), propane (R290) or R134a. With the aid of the evaporator, heat can be extracted from the interior space of the motor vehicle, for example, and this heat can be output to the environment by the condenser. Description of the Drawings

[0020] Figure 1 A schematic diagram of a device for carrying out the method according to the invention in a first embodiment according to the invention is shown in cross-section.

[0021] Figure 2 A cross-sectional view of two interconnected components after carrying out the method according to the invention is shown.

[0022] Figure 3.1 A top view of a first component and three components continuously connected thereto in a first embodiment according to the invention after carrying out the method according to the invention is shown.

[0023] Figure 3.2 A top view of the first component and three components continuously connected thereto before carrying out the method according to the invention is shown. Detailed Description

[0024] Figure 1The device 100 for carrying out the method according to the invention in a first embodiment according to the invention is shown in sectional view. The device 100 according to the invention has a mandrel DO. The mandrel DO is embodied as a hollow cylinder such that the mandrel DO has a channel KA inside and has a central axis MS. The punch ST required for the method according to the invention is arranged inside the channel KA and hermetically seals the channel KA in the initial position. The first component T1 is a tube and is here a closed tube in the form of a hollow cylinder. The mandrel DO is located inside the first component T1. The tube can, for example, be moved onto the mandrel DO. The first component T1 can have an aluminum alloy and is, for example, manufactured as a seamless drawn tube. The central axis MS coincides with the central axis of the first component T1. The first component T1 is clamped by a clamping element (not shown). The second component T2 can have an aluminum alloy. The mandrel DO has a lateral opening through which the punch ST moves along a movement axis AS. The movement axis AS is perpendicular to the central axis MS. The second component T2 is arranged above the first component T1 such that the surface normal of the second surface Z2 coincides with the movement axis AS. The first component T1 is shown as a tube and the first surface Z1 is the circumferential side surface of the tube. The first surface Z1 is simply curved to the circumferential side surface of the tube (first component T1) and the surface normal of the circumferential side surface substantially coincides with the movement axis AS. The second surface Z2 is simply curved. Above the first surface Z1 of the first component T1 (seen from the central axis MA) is arranged the second surface Z2 of the second component T2. The female die MT is arranged above the two surfaces Z1, Z2. During the execution of the method according to the invention, the female die MT is pressed onto the two components T1, T2. The female die MT has a deep drawing opening TO. The deep drawing opening TO is embodied as a circular blind hole. A medium M flows through the channel KA. The medium M is compressed air. The compressed air can, for example, be generated by a pressure generator (not shown) fluid-technically connected to the channel KA. The punch ST prevents the medium M from flowing out of the channel KA inside the mandrel DO until the pressure of the medium M acting on the punch ST is large enough to cause the punch ST to move along the movement axis AS. In this way, the force extending along the central axis MS is converted into a movement along the movement axis AS, which extends substantially perpendicular to the central axis MS and is directed outwards. The punch ST moves outwards along the movement axis AS through the lateral opening of the mandrel. The conical working pin AZ of the punch ST forms the corresponding surface portions of the corresponding two surfaces Z1, Z2 into the deep drawing opening TO of the female die MT. The formed splicing connection portion (not shown here) is formed from the inside outwards. The punch ST is supported in the mandrel DO by a rotary hinge. After the pressure of the medium M is relieved, the punch can return to its initial position by gravity. When the punch ST moves outwards along the movement axis AS, the medium M flows out of the channel KA through the opening O because the lateral opening is at least fluid-technically separated from the surroundings by the first surface Z1. The channel KA of the mandrel DO is narrowed by means of a guide F and the surface of the punch ST is targeted loaded with the medium M.Basically understood as a possible length deviation of ±2 mm and / or an angular deviation of ±10º. This deviation can be as a movement or a torsion.

[0025] Figure 2 The cross-section shows two components T1, T2 connected by a splicing connection part VB according to the invention. The first component Z1 is embossed as a closed tube and can form part of the inlet line or the outlet line of the heat exchanger 200 according to the invention. Since the first component Z1 is constructed as a tube, the first surface Z1 is simply bent into the circumferential side surface of the tube. The second component Z1 has a simply bent surface Z2 and can be constructed as a holder. The second surface Z2 is simply bent to fit the first surface Z1, so as to form a fit between the two components T1, T2. This is achieved by making the outer diameter of the tube (the first component) substantially consistent with the inner diameter of the second surface Z2 of the second component T2. The surface normals of the two surfaces Z1, Z2 coincide substantially with the movement axis AS of a punch (not shown). The central axis MS forms the central axis of the first component T1. The movement axis AS is substantially perpendicular to the central axis. The splicing connection part VB is constructed in a circular dot shape. The splicing connection part VB is advantageously located outside the first component T1 and is constructed outward. Thus, outward from the central axis MS. The diameter of the tube forming the first component T1 can be greater than 25 mm. Advantageously, since the splicing connection part VB is constructed outward, the mandrel (not shown) can be removed from the first component T1 without hooking or damaging the first component T1.

[0026] FIG. 3 shows respectively the top views of the first component T1 and three second components T2 before or after performing the method according to the invention. The first component T1 is constructed as a closed tube. The first surface Z1 is the circumferential side surface of the tube and is simply bent. The three second components T2 each have a second surface Z2. The second components T2 are respectively constructed to be of different sizes. The second surface Z2 is correspondingly simply bent to fit the first surface Z1, so as to form a fit between the first component T1 and the three second components T2 respectively. This is achieved by making the outer diameter of the tube (the first component T1) substantially consistent with the inner diameter of the second surface Z2 of the second component T2. The heat exchanger 200 according to the invention has a first component T1 and a second component T2.

[0027] Figure 3.1 The top view of the first component T1 and three second components T2 after performing the method according to the invention is shown. The three splicing connection parts VB are respectively constructed from the inside out, and the three splicing connection parts VB are respectively constructed in a circular dot shape. Figure 3.2 The top view of the first component T1 and three second components T2 before performing the method according to the invention is shown.

[0028] List of reference signs

[0029] 100 Device for performing the method according to the invention

[0030] 200 Heat exchanger, comprising two components connected by the method according to the invention

[0031] Z1, Z2 Simply curved surfaces respectively

[0032] T1, T2 Two components which are connected by the method according to the invention

[0033] RO tube, the tube comprising a simply curved first surface

[0034] Splicing connection part formed by VB

[0035] Mandrel of the DO device

[0036] Female mold of the MT device

[0037] Channel within the KA mandrel

[0038] Punch within the ST mandrel

[0039] Working pin of the AZ punch

[0040] Deep drawing opening of the female mold

[0041] Lateral opening of the mandrel

[0042] Opening of the mandrel

[0043] M Medium flowing through the channel of the mandrel

[0044] Moving direction of the punch

[0045] Moving axis, along which the punch moves

[0046] Common central axis of the mandrel and the first component

[0047] F Guide of the medium

Claims

1. A method for clinching, the method having the following steps: - Positioning two respectively simply bent faces (Z1, Z2) of two components (T1, T2) in an overlapping manner, - Positioning a mandrel (DO) under the first face (Z1), the mandrel having a movable punch (ST) inside, - Positioning a female die (MT) above the second face (Z2), the female die having a deep drawing opening (TÖ), - Moving the punch (ST) along at least one of the face normals of the two simply bent faces (Z1, Z2) such that the corresponding material is displaced from the corresponding face (Z1, Z2) into the deep drawing opening (TÖ), - Wherein, in order to hook the two faces (Z1, Z2) form - fit, the deep - drawn and extruded face part of the first face (Z1) snaps behind the immovable part of the second face (Z2), - Returning the punch (ST) to its initial position, - Removing the female die (MT) and the mandrel (DO).

2. The method according to claim 1, wherein The punch (ST) prevents the medium (M) from flowing out of the channel (KA) within the mandrel (DO) until the pressure exerted by the medium (M) on the punch (ST) is large enough to move the punch (ST).

3. The method according to claim 1 or 2, characterized in that, A splicing connection part (VB) is formed in the case of at least partial plastic deformation of the materials of the two faces (Z1, Z2), and the splicing connection part exists at least partially on and / or outside the two faces (Z1, Z2).

4. The method according to claim 1, 2 or 3, characterized in that, The movement direction of the punch (ST) extends substantially along at least one of the face normals of the two faces (Z1, Z2).

5. The method according to any one of the preceding claims, characterized in that, The first component (T1) is a closed tube, and at least part of the wall of the tube consists of the first face (Z1), wherein the tube and the mandrel (DO) are positioned such that their central axes (MA) are substantially the same.

6. The method according to any one of the preceding claims, characterized in that, The female die (MT) is almost position - fixed, and the volume of the deep drawing opening (TO) is unchangeable.

7. An apparatus (100) for performing the method according to any one of claims 1 to 6, characterized in that, The channel (KA) has an opening (O) for the outflow of the medium (M) and is connected to a pressure generator.

8. The device (100) according to claim 7, characterized in that, The punch (ST) is rotatably supported in the channel (KA).

9. The device (100) according to claim 7 or 8, characterized in that, The mandrel (DO) has a lateral opening (OS), and the punch (ST) moves through the opening.

10. The device (100) according to claim 7, 8 or 9, characterized in that, The lateral opening (OS) of the mandrel (DO) is fluid - technically separated from the surroundings through the first face (Z1).

11. The device (100) according to claim 7, 8, 9 or 10, characterized in that, The deep drawing opening (TO) is configured as a blind hole in the female die (MT) in the radial and axial directions of the deep drawing opening (TO).

12. The device (100) according to claim 7, 8, 9, 10 or 11, characterized in that, The punch (ST) has a circular working pin (AZ), and the working pin at least partially penetrates into the deep drawing opening (TO).

13. A heat exchanger (200), the heat exchanger comprising at least two components (T1, T2), the components being interconnected by the method according to any one of claims 1 to 6.

14. The heat exchanger (200) according to claim 13, characterized in that, The first component (T1) is a tube, and the second component (T2) is a retainer for connecting the heat exchanger (200) to another component, wherein the diameter of the tube is greater than 20 mm.

15. A refrigerant circuit for a motor vehicle, the refrigerant circuit having at least one heat exchanger (200) according to claim 13.

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