Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
  • B23K20/04—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a rolling mill
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
  • B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
  • B23K20/233—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer
  • B23K20/2333—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer one layer being aluminium, magnesium or beryllium
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
  • B23K33/004—Filling of continuous seams
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
  • B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
  • B32B15/017—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of aluminium or an aluminium alloy, another layer being formed of an alloy based on a non ferrous metal other than aluminium
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K2101/00—Articles made by soldering, welding or cutting
  • B23K2101/18—Sheet panels
  • B23K2101/185—Tailored blanks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K2103/00—Materials to be soldered, welded or cut
  • B23K2103/08—Non-ferrous metals or alloys
  • B23K2103/10—Aluminium or alloys thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K2103/00—Materials to be soldered, welded or cut
  • B23K2103/08—Non-ferrous metals or alloys
  • B23K2103/12—Copper or alloys thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K2103/00—Materials to be soldered, welded or cut
  • B23K2103/18—Dissimilar materials

Definitions

• the invention is based on a method for producing an overlapping composite material from sheet metal having the features specified in the preamble of claim 1, as is known from WO 2015/043951 A1.
• copper and aluminum overlap composites are used when replacing heavy and expensive copper with lighter and less expensive aluminum.
• a problem in the production of such overlap material composites is the adhesion between the two sheets. This problem is particularly pronounced for metals such as copper or aluminum, since form on their surfaces very quickly passivating coatings such as oxide layers. These impede or hinder contact between bondable metal atoms of the joining partners.
• the object of the present invention is to show a way in which the adhesion between the sheets used can be improved in the production of a lap joint material. This object is achieved by a method having the features specified in claim 1. Advantageous developments of the invention are the subject of dependent claims.
• a first sheet of a first material and a second sheet of a second material which has a lower strength, in particular a lower yield strength, than the first material overlap one another in an edge region placed and then connected by rollers.
• the first sheet has a wedge-shaped in cross-section edge, which can be formed, for example, by abrasive machining of the sheet, such as by milling or grinding.
• the second sheet is then applied with its edge to a side surface of the first sheet formed by the wedge-shaped edge and then connected by rollers.
• the side surface formed by the wedge-shaped edge of the first sheet has a greater width than a side surface of the edge of the second sheet, which is connected to the first sheet, so that the edge region of the second sheet is deformed more in the subsequent rolling than the first sheet ,
• the second sheet is applied with its edge to an inclined side surface of the first sheet, which is formed by its wedge-shaped edge.
• the second sheet thus does not lie on a step or recess formed in the edge region of the first sheet, but on an inclined side surface of the wedge-shaped edge.
• the inventive design of the relevant side surfaces of the sheets causes an increase in the shear and compressive stress between the two materials during rolling and thus on the one hand, an increase in the local shape change of the edge regions by shearing in the materials of the two sheets, on the other hand, the improved extrusion of bondable Metal atoms in the connection zone by effective compressive stresses.
• a significant increase in surface area and thus tearing of oxide layers or other passivation and cover layers in the edge regions of the two sheets is achieved.
• the edge region of the second sheet is plastically deformed during rolling over the wedge-shaped edge of the first sheet.
• the initially relatively narrow side surface of the second sheet is thereby widened until both adjoining side surfaces are the same size.
• any oxide or other cover layers crack on this side surface, so that underlying metal comes to the surface and in contact with the first sheet.
• the material of the edge portion of the second sheet is pressed against the wedge-shaped side surface of the first sheet and flows to a certain extent on the wedge-shaped side surface. In this case, any existing passivation layers of the first sheet are torn open at the side surface, so that the metal of the first sheet lying under the passivation layers comes into contact with the metal of the second sheet and can form a well-adhering connection.
• the side surface formed by the wedge-shaped edge of the first sheet has a width which is at least twice as large as the width of the side surface of the second sheet.
• the width of a side surface is to be measured in each case from a front side of the relevant sheet to the back.
• the width of a side surface thus corresponds to the distance of an edge on a front side of a sheet to the adjacent edge on the back of the sheet.
• the width of the side surface of the wedge-shaped edge of the first sheet is generally greater, the flatter the wedge is formed.
• the width of the side surface of the second sheet is minimum when the side surface of the second sheet is perpendicular to the front and back of the sheet and then corresponds to the sheet thickness. The more the side surface is inclined to the front and back of the sheet, the larger the width of the side surface.
• the relevant side surface of the second sheet may be perpendicular to the front and back of the sheet, so that the width of the side surface corresponds to the sheet thickness and is minimal.
• the second metal sheet has an edge region in which the sheet thickness decreases from the front edge, which is attached to the wedge-shaped edge of the first sheet, to the rear edge of the edge region.
• the edge of the second sheet seen in cross-section tapers over a length to be measured in the sheet plane, which is not more than a quarter of the maximum thickness of the second sheet, preferably over a length of between one fifth and one twentieth the maximum thickness of the second sheet is.
• the side surface may include an angle of 80 ° to 89 ° with a side of the first sheet facing the front side of the second sheet, in particular 86 ° to 89 °.
• the side surface need not be formed as a flat surface, but may for example also be a curved surface or be composed of several flat surfaces.
• the side surface of the wedge-shaped edge of the first sheet has a width which is more than twice the thickness of the first sheet.
• the side surface may have a width that is two to four times the thickness of the first sheet.
• the side surface formed by the wedge-shaped edge of the first sheet can be a flat surface which forms an acute angle with a rear side of the first sheet, for example an angle between 10 ° and 30 °, in particular 15 ° to 25 °.
• a shape is not optimal, since in one end section In such a wedge, the ratio between the thickness of the firmer material to the thickness of the softer material is becoming increasingly unfavorable and thus the firmer metal is increasingly less reshaped.
• An advantageous development of the invention therefore provides that the wedge-shaped edge has a thickness which decreases in cross-section seen from a beginning to an end at the wedge tip decreases, the thickness in the end portion per unit length decreases faster than in one of the End portion adjacent main section. This can be achieved, for example, by blunting the edge between the back of the first sheet and the side surface. Seen in cross-section so the tip of the wedge is dulled.
• the side surface of the wedge-shaped edge of the first sheet may be shaped as a curved surface.
• An easy way to make a suitable side surface is to limit these by multiple flat surfaces.
• a major portion of the side surface may be bounded by a first planar surface including an angle between 10 ° and 30 °, in particular 15 ° to 25 °, with the back of the first sheet, and an end portion adjacent thereto of a more steeply sloping curve be limited to a surface, for example, a surface which forms an angle between 25 ° and 50 °, in particular 35 ° to 45 ° with the back of the first sheet.
• the end portion falls in a region adjacent to the main portion initially only slightly steeper than the main portion, for example, with the back of the first sheet at an angle of 35 ° to 45 ° includes and only at the end of the end portion with a larger angle the back of the sheet is included.
• the thickness of the wedge-shaped edge in the main section is reduced by at least three-fifths, for example by 60% to 90%, in particular 70% to 80%.
• each tangent to the main portion may include an angle of 30 ° or less with the sheet metal plane. Tangencies at the end portion of the side surface then include larger angles with the sheet plane, for example angles of 40 ° or more.
• the angle tangent to the end portion including the plane of the sheet increases towards the tip of the wedge, for example to values of 35 ° or more, preferably 35 ° to 45 °.
• a further advantageous embodiment of the invention provides that the second sheet is attached to the wedge-shaped edge of the first sheet at a position at which the edge has a thickness which is more than half the maximum thickness of the first sheet, for example, between 55 % and 90% of the maximum thickness of the first sheet, in particular 70% to 90%.
• This point is defined by the point or the line at which or at which the first sheet gets in contact with the second sheet when the two sheets are oriented in parallel.
• the second sheet can be attached to the first sheet, that the second sheet overlaps the beginning of the wedge-shaped edge.
• an initial region of the wedge-shaped edge of the first sheet does not overlap with the second sheet before the start of the rolling operation; for example, this initial portion not overlapping with the second sheet may have a width that is between one Fifth and half the thickness of the first sheet is, in particular two-fifths to half the thickness of the first sheet is.
• the first sheet may, for example, consist of copper or a copper-based alloy.
• the second sheet may, for example, consist of aluminum or an aluminum-based alloy.
• Aluminum has a much lower strength than copper, so it is easier to plastically deform by rolling than copper.
• a further advantageous embodiment of the invention provides that the thickness of the produced overlap composite material is not more than 60% of the thickness of the first sheet before rolling.
• the thickness of the overlap composite may be one half or less of the thickness of the first sheet before rolling, more preferably 30% to 40%.
• the sheets are thus plastically deformed during rolling, which is advantageous for good adhesion in the overlapping edge region.
• the sheets used preferably have a thickness equal to their manufacturing tolerances. But it can also be used different thicknesses sheets. In general, there is no problem if the thickness of the first sheet is between twice and half the thickness of the second sheet. Preferably, however, the thicknesses of the two sheets differ only by 20% or less.
• Figure 1 is a schematic representation of sheets for producing an overlap composite material.
• Fig. 2 shows the sheets shown in Fig.1 before rolling;
• Fig. 3 is a detail view of Fig.1;
• Fig. 4 is a sectional view of the overlap composite material
• FIG. 5 is a detail view of Fig. 4th
• first sheets 1 shows two first sheets 1, for example made of copper or a copper-based alloy, and a second sheet 2, from which the overlapping composite material illustrated in FIG. 4 is produced.
• first sheets 1 and the second sheet 2 have the same thickness within the manufacturing tolerance. But the sheets 1, 2 can also be different thickness, for example, by 20% have different thicknesses.
• One of the first sheets 1 of FIG. 1 is shown in detail in FIG. 3.
• the first sheet 1 has a wedge-shaped edge of width bF1. This wedge-shaped edge forms an inclined side surface 3, to which the second sheet 2 is applied with its edge, as shown in Fig. 2.
• the width of the side surface 3 of the first sheet 1 is greater than the width of the corresponding side surface 4. In the shown For example, the width of the side surface 3 is more than twice the width of the side surface 4.
• the width bF1 of the wedge-shaped edge region and the width of the side surface 3 measured as the arc length are more than twice the thickness of the first metal sheet 1.
• the width of the wedge-shaped edge measured from the wedge tip can also amount to considerably more than twice the metal sheet thickness. However, a width of more than 4 times the sheet thickness usually has no advantages.
• the wedge-shaped edge portion has a truncated tip. In other words, the thickness of the sheet 1 in the wedge-shaped edge region therefore decreases more rapidly in an end section adjoining the tip than in a main section, to which most of the width of the wedge-shaped edge region is omitted.
• the side surface 3 may be convex, in other words, be free of cavities or indentations.
• the decrease in the thickness of the first sheet 1 in the wedge-shaped edge region is strictly monotonous in the illustrated embodiment.
• the side surface in the main section is a plane which encloses an angle a1 with the plane of the sheet, which may, for example, be between 10 ° and 30 °, in particular 15 ° and 25 °, and is approximately 20 ° in FIG.
• the side surface is more inclined, for example, first with an angle ß1 and then with an angle ⁇ 1.
• the angle ⁇ 1 may be e.g. between 25 ° and 50 °, preferably 35 ° to 45 °, and is in the example shown 40 °.
• the angle ⁇ 1 is greater than the angle ⁇ 1, for example between 45 ° and 80 °, in particular 55 ° to 65 °, and in the example shown is 60 °.
• the side surface 3 is formed by planar partial surfaces.
• the side surface 3 may also be curved. More generally, the shape of the side surface can be described in that, seen in cross section, each tangent to the side surface 3 in the main portion with the Sheet plane forms an angle of at most 30 °, preferably at most 20 °, while each tangent in the end portion with the sheet plane at an angle of at least 30 °, preferably at least 35 °, for example 40 ° or more includes.
• the angle subtended by a tangent to the end portion with the sheet plane increases toward the tip, for example to values of 50 ° or more.
• each tangent may include an angle of less than 50 °, eg, 35 ° to 45 °, with the sheet plane, thus decreasing the thickness from a value h ⁇ 1 to a value hy1. From this thickness then includes any tangent to the sheet plane at an angle of more than 50 °, for example, 55 ° to 80 °.
• the value h ⁇ 1 may be, for example, 10% to 40%, in particular 20% to 30%, of the maximum thickness of the first sheet 1, the value ryl being for example 5% to 15%, in particular 5% to 10%.
• the main section can directly adjoin the end section. However, it may also be a transition section between the main section and the end section.
• the thickness of the edge portion is reduced by three-fifths or more, for example, by 60% to 90%, especially 70 ° to 80 °.
• the main portion has a width which is at least as large as the maximum thickness of the first sheet 1.
• the main portion has a width which is at least 1.5 times the maximum thickness of the first sheet 1.
• the end portion has a width, e.g. between one-fifth and one-seventh of the main section
• the side surface 3 formed by the wedge-shaped edge of the first metal sheet 1 has at least twice the width as the side surface 4 of the edge of the second metal sheet 2 applied to this side surface 3 of the first metal sheet 1.
• the side surface 4 is inclined.
• the second sheet 2 tapers as from the point with which it is applied to the first sheet 1.
• the second sheet 2 has an edge which, seen in cross-section, tapers from the edge which is attached to the wedge-shaped edge of the first sheet 1.
• the edge seen in cross-section can taper over a length to be measured in the sheet metal plane, which is not more than one quarter of the maximum thickness of the second sheet, preferably over a length which is between one fifth and one twentieth of the maximum thickness of the second sheet.
• the edge region of the second sheet 2 is thus narrow and the thickness of the second sheet 2 is reduced to zero over a width which is between one fifth and one twentieth of the thickness of the sheet 2.
• the side surface 4 may be a flat surface including an angle of 80 ° to 89 ° with the plane of the sheet, e.g. 86 ° to 89 °.
• the side surface 4 may also be curved.
• Fig. 2 shows how the sheets 1, 2 are attached to each other.
• the second sheet 2 is preferably attached to the wedge-shaped edge of the first sheet 1 at a position at which the edge has a thickness which is more than half the maximum thickness of the first sheet 1, for example between 70% and 90 %.
• the second sheet 2 contacts the side surface 3 of the first sheet 1 at a position where the thickness of the sheet 1 is between 85% and 90% of the maximum thickness of the first sheet 1.
• the sheets 1, 2 After the sheets 1, 2 have been applied to each other according to Figure 2, they are connected by rolling with each other to the overlap composite material shown in Fig. 4.
• the sheets 1, 2 are thereby greatly deformed, so that the composite material has a thickness which is typically not more than three-fifths of the maximum thickness of the first sheet 1 before rolling. In the example shown, the composite material has a thickness that is less than 40% of the original thickness of the first sheet 1.
• FIG. 5 shows schematically the connection zone between the first sheet 1 and the second sheet 2 of the finished overlap composite material.
• the sheets 1, 2 are degreased and cleaned. Thereafter, the sheets 1, 2 annealed to a defined Adjust material condition, especially in the firmer material. Alternatively or additionally, the sheets 1, 2 can be brushed before the method is carried out.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)
• Metal Rolling (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=63364069

Family Applications (1)

Country Status (8)

Families Citing this family (1)

Family Cites Families (20)

• 2017
  • 2017-08-28 DE DE102017119677.3A patent/DE102017119677A1/de active Pending
• 2018
  • 2018-08-23 KR KR1020207001567A patent/KR20200020834A/ko active IP Right Grant
  • 2018-08-23 EP EP18759303.3A patent/EP3676044A1/de not_active Withdrawn
  • 2018-08-23 MX MX2019015658A patent/MX2019015658A/es unknown
  • 2018-08-23 WO PCT/EP2018/072739 patent/WO2019042855A1/de unknown
  • 2018-08-23 JP JP2020509520A patent/JP6916958B2/ja active Active
  • 2018-08-23 CN CN201880055643.2A patent/CN111050972A/zh active Pending
• 2020
  • 2020-02-24 US US16/798,745 patent/US11511369B2/en active Active

Also Published As

Similar Documents

Legal Events