阅读说明：本技术 一种纤维金属层合板、制备方法及电阻焊方法 (Fiber metal laminated plate, preparation method and resistance welding method ) 是由 张永强 付参 鞠建斌 王鹏博 伊日贵 于 2020-06-08 设计创作，主要内容包括：一种纤维金属层合板、制备方法及电阻焊方法,所述纤维金属层合板包括：(N+1)个金属层和N个纤维预浸层,(N+1)个所述金属层和N个所述纤维预浸层交替排列且最外端两侧均为所述金属层,相邻两个所述金属层中至少有一个所述金属层上设置有待焊区,所述待焊区包括若干凸起,所述凸起穿透相邻两个所述金属层之间的所述纤维预浸层以使二者连接,其中,N为正整数。本申请提供的纤维金属层合板在各金属层之间通过金属凸起相接触,使得在后续电阻焊过程中,电流可以顺利通过纤维金属层合板,从而使得所制备的纤维金属层合板具有电阻焊接性。(A fiber metal laminate, a method of manufacturing and a method of resistance welding, the fiber metal laminate comprising: the metal layer structure comprises (N +1) metal layers and N fiber prepreg layers, wherein the (N +1) metal layers and the N fiber prepreg layers are alternately arranged, both sides of the outermost end of each metal layer are the metal layers, at least one metal layer in two adjacent metal layers is provided with a region to be welded, the region to be welded comprises a plurality of protrusions, and the protrusions penetrate through the fiber prepreg layers between the two adjacent metal layers to connect the two metal layers, wherein N is a positive integer. According to the fiber metal laminated plate, the metal layers are in contact with each other through the metal protrusions, so that current can smoothly pass through the fiber metal laminated plate in the subsequent resistance welding process, and the prepared fiber metal laminated plate has resistance welding performance.)

1. A fiber metal laminate, comprising: the metal layer structure comprises (N +1) metal layers and N fiber prepreg layers, wherein the (N +1) metal layers and the N fiber prepreg layers are alternately arranged, both sides of the outermost end of each metal layer are the metal layers, at least one metal layer in two adjacent metal layers is provided with a region to be welded, the region to be welded comprises a plurality of protrusions, and the protrusions penetrate through the fiber prepreg layers between the two adjacent metal layers to connect the two metal layers, wherein N is a positive integer.

2. The fiber metal laminate panel according to claim 1, wherein the fiber prepreg layer is composed of glass fiber and polypropylene resin.

3. Fiber metal laminate according to claim 2, wherein the glass fibers have a diagonal of at least two directions.

4. A method of manufacturing a fiber metal laminate, wherein the fiber metal laminate comprises the fiber metal laminate according to any of claims 1-3, the method comprising the steps of:

selecting (N +1) metal layers and N fiber prepreg layers; wherein N is a positive integer;

alternately arranging (N +1) metal layers and N fiber prepreg layers according to a first sequence, wherein the metal layers are arranged on two sides of the outermost end;

arranging a bulge on the metal layer; at least one of the two adjacent metal layers is provided with a protrusion, and the height of the protrusion is greater than or equal to the thickness of the fiber prepreg;

coating a mold in a hot press with a release agent;

sequentially placing the (N +1) metal layers and the N fiber prepreg layers into the mold according to the first sequence, wherein a glue layer is arranged between the metal layers and the fiber prepreg layers;

and starting the hot press, keeping the temperature and pressure of the die after the die reaches a preset temperature, and cooling at a preset cooling speed to obtain the fiber metal laminated board.

5. The method of manufacturing a fiber metal laminate according to claim 4, wherein the providing a protrusion on the metal layer comprises: disposing the protrusion on the metal layer using a stamping die.

6. The method of manufacturing a fiber metal laminate according to claim 4, wherein the providing a protrusion on the metal layer comprises: disposing the bump on the metal layer using a pulsed laser.

7. A method of resistance welding of a fiber metal laminate, characterized in that the fiber metal laminate comprises a fiber metal laminate according to any of claims 1-3, the method comprising the steps of:

oppositely placing a first electrode and a second electrode;

overlapping the fiber metal laminate with a sheet material and placing between the first electrode and the second electrode; wherein the region to be soldered is collinear with the first and second electrodes;

moving the first electrode and the second electrode relative to each other and clamping the fiber metal laminate with the sheet material with a pressure N;

a conduction time duration T between the first electrode and the second electrode₁Current of (I)₁Melting and at least partially extruding the fiber prepreg layer around the protrusion out of the area to be welded;

a conduction time duration T between the first electrode and the second electrode₂Current of (I)₂And forming a nugget between the metal layer of the fiber metal laminated plate and the plate material so as to weld the metal layer of the fiber metal laminated plate and the plate material.

8. An electric resistance welding method of a fibre metal laminate according to claim 7, characterised in that the current I₁Heat of generation Q₁With said current I₂Heat of generation Q₂The relationship is as follows: q₁＜Q₂。

9. An electric resistance welding method of a fibre metal laminate according to claim 7, characterised in that the sheet material is an electrically conductive material.

10. An electric resistance welding method of a fiber metal laminate according to claim 7, characterized in that the sheet material comprises the fiber metal laminate.

Technical Field

The invention belongs to the field of connection of fiber metal laminated plates, and particularly relates to a fiber metal laminated plate, a preparation method and a resistance welding method.

Background

The fiber metal laminate is an interlaminar hybrid composite material which is formed by alternately laying metal sheets and fiber reinforced resin prepreg and then curing the metal sheets and the fiber reinforced resin prepreg at a certain temperature and under a certain pressure. The fiber metal laminated plate has the characteristics of small density, good impact property, long fatigue life, high damage tolerance and the like, and has better application prospect in the field of airplane and automobile manufacturing.

Resistance welding is a method of welding by applying pressure while locally heating a workpiece by using resistance heat generated by passing a current through the workpiece and a contact portion as a heat source. Resistance spot welding is the most widely used joining technique in automotive manufacturing.

To meet the need for lightweight vehicle bodies, the automotive industry is increasingly demanding lighter materials. Wherein, the fiber metal laminate can realize the lightweight of automobile body. For example, patent 201710221337.9 discloses a method of making a fiber metal laminate. Because the electrical conductivity of the fiber prepreg is poor, the prepared laminated plate cannot realize resistance spot welding and can only realize connection in a mechanical connection mode and the like.

Disclosure of Invention

The invention provides a fiber metal laminated plate, a preparation method and a resistance welding method, which solve the problem that a layer thickness plate prepared in the prior art cannot realize resistance spot welding and can only realize connection in modes of mechanical connection and the like.

In order to solve the above technical problems, the present invention provides a fiber metal laminate sheet, comprising: the metal layer structure comprises (N +1) metal layers and N fiber prepreg layers, wherein the (N +1) metal layers and the N fiber prepreg layers are alternately arranged, both sides of the outermost end of each metal layer are the metal layers, at least one metal layer in two adjacent metal layers is provided with a region to be welded, the region to be welded comprises a plurality of protrusions, and the protrusions penetrate through the fiber prepreg layers between the two adjacent metal layers to connect the two metal layers, wherein N is a positive integer.

Preferably, the fiber prepreg layer is composed of glass fibers and polypropylene resin.

Preferably, the glass fibers have at least two directions of bias.

The present invention also provides a method of manufacturing a fiber metal laminate comprising the fiber metal laminate as in any one of the above, the method comprising the steps of:

selecting (N +1) metal layers and N fiber prepreg layers; wherein N is a positive integer;

alternately arranging (N +1) metal layers and N fiber prepreg layers according to a first sequence, wherein the metal layers are arranged on two sides of the outermost end;

arranging a bulge on the metal layer; at least one of the two adjacent metal layers is provided with a protrusion, and the height of the protrusion is greater than or equal to the thickness of the fiber prepreg;

coating a mold in a hot press with a release agent;

sequentially placing the (N +1) metal layers and the N fiber prepreg layers into the mold according to the first sequence, wherein a glue layer is arranged between the metal layers and the fiber prepreg layers;

and starting the hot press, keeping the temperature and pressure of the die after the die reaches a preset temperature, and cooling at a preset cooling speed to obtain the fiber metal laminated board.

Preferably, the disposing of the protrusion on the metal layer includes: disposing the protrusion on the metal layer using a stamping die.

Preferably, the disposing of the protrusion on the metal layer includes: disposing the bump on the metal layer using a pulsed laser.

The present invention also provides a resistance welding method of a fiber metal laminate including the fiber metal laminate as in any one of the above, the method including the steps of:

oppositely placing a first electrode and a second electrode;

overlapping the fiber metal laminate with a sheet material and placing between the first electrode and the second electrode; wherein the region to be soldered is collinear with the first and second electrodes;

moving the first electrode and the second electrode relative to each other and clamping the fiber metal laminate with the sheet material with a pressure N;

a conduction time duration T between the first electrode and the second electrode₁Current of (I)₁Melting and at least partially extruding the fiber prepreg layer around the protrusion out of the area to be welded;

a conduction time duration T between the first electrode and the second electrode₂Current of (I)₂And forming a nugget between the metal layer of the fiber metal laminated plate and the plate material so as to weld the metal layer of the fiber metal laminated plate and the plate material.

Preferably, the current I₁Heat of generation Q₁With said current I₂Heat of generation Q₂The relationship is as follows: q₁＜Q₂。

Preferably, the plate material is a conductive material.

Preferably, the board comprises the fiber metal laminate.

One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

according to the fiber metal laminated plate, the metal layers are in contact with each other through the metal protrusions, so that current can smoothly pass through the fiber metal laminated plate in the subsequent resistance welding process, and the prepared fiber metal laminated plate has resistance welding performance.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic view of an embodiment 1 of a fiber metal laminate provided by an embodiment of the present invention;

fig. 2 is a schematic view of an embodiment 2 of a fiber metal laminate provided by an embodiment of the present invention;

FIG. 3 is a schematic view of example 1 of resistance spot welding of a fiber metal laminate according to an embodiment of the present invention;

FIG. 4 is a schematic view of example 2 of resistance spot welding of a fiber metal laminate according to an embodiment of the present invention;

in the figure: the metal-clad plate comprises a 1-fiber metal laminated plate, 11 metal layers, 12 fiber prepreg layers, 13 bulges, 2 plates, 3 first electrodes and 4 second electrodes.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.

Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.

Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.

Referring to fig. 1 and 2, the present invention provides a fiber metal laminate sheet including: the metal layers 11 and the fiber prepreg layers 12 are arranged alternately, two sides of the outermost end of each metal layer 11 are the metal layers 11, a region to be welded is arranged on at least one metal layer 11 in two adjacent metal layers 11, the region to be welded comprises a plurality of protrusions 13, the protrusions 13 penetrate through the fiber prepreg layers 12 between two adjacent metal layers 11 to connect the metal layers 11, and N is a positive integer.

Referring to fig. 1, in the embodiment of the present application, the metal layer 11 is an IF steel plate with a thickness of 0.6mm, and the number of the metal layers is 2; the fiber prepreg layer 12 has a thickness of 0.6mm and a number of 1 layer, and is composed of glass fibers and polypropylene resin, wherein the glass fibers have twill in at least two directions (such as 0 ° and 90 °); the upper top surface of the metal layer 11 on the bottom layer is provided with a region to be welded, the region to be welded comprises a protrusion 13, the protrusion 13 is a one-way protrusion, the height of the protrusion is 0.6mm, the region to be welded with the diameter of 30mm is formed, and the protrusion 13 on the metal layer 11 on the bottom layer penetrates through the fiber prepreg layer 12 to enable the metal layer 11 on the top layer and the metal layer 11 on the bottom layer to be in contact with each other.

Referring to fig. 2, in the embodiment of the present application, the metal layer 11 is an IF steel plate with a thickness of 0.6mm, and the number of the metal layers is 3; the fiber prepreg layer 12 has a thickness of 0.6mm and a number of 2 layers, and is composed of glass fibers and polypropylene resin, wherein the glass fibers have twill in at least two directions (such as 30 degrees and 60 degrees); the upper top surface and the lower bottom surface of the metal layer 11 in the middle layer are both provided with regions to be welded, the regions to be welded comprise protrusions 13, the protrusions 13 are bidirectional protrusions, the height of the protrusions is 0.6mm, the regions to be welded with the diameter of 30mm are formed, the protrusions 13 on the metal layer 11 in the middle layer penetrate through the fiber prepreg layers 12 on the two sides, and the metal layer 11 in the middle layer is respectively in contact with the metal layer 11 in the top layer and the metal layer 11 in the bottom layer.

The present invention also provides a method of manufacturing a fiber metal laminate comprising the fiber metal laminate 1 as described above, the method comprising the steps of:

selecting (N +1) metal layers 11 and N fiber prepreg layers 12; wherein N is a positive integer;

alternately arranging (N +1) metal layers 11 and N fiber prepreg layers 12 according to a first sequence, wherein the two sides of the outermost end are the metal layers 11;

arranging a bump 13 on the metal layer 11; at least one metal layer 11 of the two adjacent metal layers 11 is provided with a protrusion 13, and the height of the protrusion 13 is greater than or equal to the thickness of the fiber prepreg layer 12;

coating a mold in a hot press with a release agent;

sequentially placing (N +1) metal layers 11 and N fiber prepreg layers 12 into the mold according to the first sequence, wherein a glue layer is arranged between the metal layers 11 and the fiber prepreg layers 12;

and starting the hot press, keeping the temperature and pressure of the die after the die reaches a preset temperature, and cooling at a preset cooling speed to obtain the fiber metal laminated board 1.

The following description will be made of a method for manufacturing a fiber metal laminate provided in the present application with specific examples.

In order to obtain the fiber metal laminate shown in fig. 1, a method for preparing the fiber metal laminate of the present application comprises the following specific steps:

selecting 2 metal layers 11 with the thickness of 0.6mm and 1 fiber prepreg layer 12 with the thickness of 0.6 mm;

arranging 2 metal layers 11 and 1 fiber prepreg layer 12 alternately according to the sequence in fig. 1, wherein the two sides of the outermost end are both the metal layers 11, and the middle layer is the fiber prepreg layer 12;

arranging a projection 13 with the height of 0.6mm on the metal layer 11 positioned at the bottom layer and facing the metal layer 11 at the top layer;

a hot press with a concave-convex die is adopted, and a mold in the hot press is coated with a release agent;

sequentially placing 2 metal layers 11 and 1 fiber prepreg layer 12 into the mold according to the sequence in fig. 1, wherein a glue layer is arranged between the metal layers 11 and the fiber prepreg layers;

and starting the hot press, keeping the temperature of the mold at 200 ℃ for 5 minutes and maintaining the pressure (the pressure is 2MPa and the pressure maintaining time is 8 minutes), allowing the prefabricated protrusions 13 to penetrate through the fiber prepreg layer 12 under the action of the pressure to enable the adjacent metal layers 11 to be in contact with each other, and cooling at a preset cooling speed of 0.6 ℃/min to obtain the fiber metal laminated plate 1 shown in the figure 1.

In order to obtain the fiber metal laminate shown in fig. 2, a method for preparing the fiber metal laminate of the present application comprises the following specific steps:

selecting 3 metal layers 11 with the thickness of 0.6mm and 2 fiber prepreg layers 12 with the thickness of 0.6 mm;

arranging 3 metal layers 11 and 2 fiber prepreg layers 12 alternately in the order of fig. 2;

the top surface and the bottom surface of the metal layer 11 positioned in the middle layer are respectively provided with a bulge 13 with the height of 0.6mm facing to the top metal layer 11 and the bottom metal layer 11;

a hot press with a concave-convex die is adopted, and a mold in the hot press is coated with a release agent;

sequentially placing 3 metal layers 11 and 2 fiber prepreg layers 12 into the mold according to the sequence in fig. 2, wherein a glue layer is arranged between the metal layers 11 and the fiber prepreg layers 12;

and starting the hot press, keeping the temperature of the die at 200 ℃ for 5 minutes and maintaining the pressure (the pressure is 2MPa and the pressure maintaining time is 8 minutes), allowing the prefabricated protrusions 13 to penetrate through the fiber prepreg layer 12 under the action of the pressure to enable adjacent metal layers 11 to be in contact, and cooling at a preset cooling speed of 0.6 ℃/min to obtain the fiber metal laminated board 1 in the figure 2.

In the embodiment of the present application, the disposing of the protrusion 13 on the metal layer 11 includes: the metal layer 11 is provided with the projection 13 using a press mold. Specifically, the metal layer 11 is pressed by a press die, so that the projections 13 can be press-formed on the surface thereof.

In the embodiment of the present application, the disposing of the protrusion 13 on the metal layer 11 includes: the bumps 13 are provided on the metal layer 11 using a pulsed laser. Specifically, the pulsed laser directionally discharges laser energy to the metal layer 11, so that the bumps 13 can be formed on the surface thereof.

Referring to fig. 3 and 4, the present invention provides a resistance welding method of a fiber metal laminate including the fiber metal laminate 1 of fig. 1 and 2, the method including the steps of:

the first electrode 3 and the second electrode 4 are oppositely arranged;

overlapping the fiber metal laminate plate 1 with the plate material 2 and placing between the first electrode 3 and the second electrode 4; wherein the area to be soldered is collinear with the first electrode 3 and the second electrode 4;

relatively moving the first electrode 3 and the second electrode 4 and clamping the fiber metal laminate 1 and the sheet material 2 with a pressure N;

a conduction duration T between the first electrode 3 and the second electrode 4₁Current of (I)₁Melting and at least partially extruding the fibre prepreg layer around the projections 13 out of the area to be welded;

a conduction duration T between the first electrode 3 and the second electrode 4₂Current of (I)₂A nugget is formed between the metal layer 11 of the fiber metal laminate sheet 1 and the sheet material 2 to weld the two.

The following describes a method of resistance welding a fiber metal laminate provided in the present application with specific examples.

For the fiber metal laminate shown in fig. 1, the specific steps of the electric resistance welding method of the fiber metal laminate in the present application are as follows:

a first electrode 3 and a second electrode 4 on the medium-frequency direct current spot welding equipment are oppositely arranged;

the fiber metal laminate sheet 1 shown in fig. 1 and a plate material 2(1mm thick IF steel plate) were overlapped and placed between the first electrode 3 and the second electrode 4; wherein the area to be soldered is collinear with the first electrode 3 and the second electrode 4;

relatively moving the first electrode 3 and the second electrode 4, and clamping the fiber metal laminate 1 and the plate 2 with a pressure of 2 kN;

a current I having a duration of conduction of 0.2S between the first electrode 3 and the second electrode 4₁(5kA) melting the pre-preg layers of fibres around the bumps 13 and at least partially extruding the areas to be soldered;

a current I having a duration of conduction of 0.2S between the first electrode 3 and the second electrode 4₂(9kA), a nugget is formed between the metal layer 11 of the fiber metal laminate sheet 1 and the plate material 2, and the fiber metal laminate sheet 1 and the plate material 2 can be welded by the nugget.

For the fiber metal laminate shown in fig. 2, the specific steps of the electric resistance welding method of the fiber metal laminate in the present application are as follows:

a first electrode 3 and a second electrode 4 on the medium-frequency direct current spot welding equipment are oppositely arranged;

the fiber metal laminate sheet 1 shown in fig. 2 and a plate material 2(1mm thick IF steel plate) were overlapped and placed between the first electrode 3 and the second electrode 4; wherein the area to be soldered is collinear with the first electrode 3 and the second electrode 4;

relatively moving the first electrode 3 and the second electrode 4, and clamping the fiber metal laminate 1 and the plate 2 with a pressure of 2.5 kN;

a current I having a duration of conduction of 0.3S between the first electrode 3 and the second electrode 4₁(6kA) melting and at least partially extruding the fibre prepreg layer around the projections 13 out of the area to be soldered;

a current I having a duration of conduction of 0.3S between the first electrode 3 and the second electrode 4₂(10kA) ofA nugget is formed between the metal layer 11 of the fiber metal laminate 1 and the sheet material 2, and the fiber metal laminate 1 and the sheet material 2 can be welded by the nugget.

In the embodiment of the application, the current I₁Heat of generation Q₁With said current I₂Heat of generation Q₂The relationship is as follows: q₁＜Q₂So that a nugget can be formed between the metal layer 11 and the sheet material 2 to weld the fiber metal laminate 1 and the sheet material 2.

In order to ensure that the sheet material 2 and the metal layer 11 generate joule heat when electrified to complete the resistance welding, in the embodiment of the present application, the sheet material 2 is a conductive material. When the sheet material 2 is a conductive material, the first electrode 3 and the second electrode 4 may form a path when contacting the sheet material 2 and the fiber metal laminate 1, respectively, thereby achieving welding.

In the present embodiment, the sheet material 2 includes the fiber metal laminate sheet 1, and two or more fiber metal laminate sheets 1 may be welded according to the welding method described above.

According to the fiber metal laminated plate, the metal layers are in contact with each other through the metal protrusions, so that current can smoothly pass through the fiber metal laminated plate in the subsequent resistance welding process, and the prepared fiber metal laminated plate has resistance welding performance.

Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.