KR101279783B1 - Joining method of a different material - Google Patents

Abstract

The present invention relates to a method for joining dissimilar materials, and more particularly, to bond dissimilar materials having different hardness, such as copper (Cu) and aluminum (Al), which are plug-in terminal materials for hybrid vehicle batteries. The present invention relates to a method for joining dissimilar materials in which forging is performed without welding, and is firmly joined.
The present invention provides a space in which the low hardness material 12 can penetrate into the outer diameter of the bonding end 11a of the high hardness material 11 in the forging process in the bonding method of heterogeneous materials having relatively different hardness. Penetrating part forming step of forming a penetrating part (11b) to combine the heterogeneous material (S100); Heterogeneous material assembly step (S200) of assembling the bonding end (12a) of the low hardness material 12 in the outer diameter of the bonding end (11a) of the high hardness material (11) formed with the penetrating portion (11b); Among the assembled dissimilar materials, the low hardness material 12 is inserted into the mold 20 and the high hardness material 11 is punched by the press 30 from above, and the low hardness material 12 is deformed by pressure to form a high diameter. It is characterized in that it comprises a; forging step (S300) for the first shape of the appearance of the high-hardness material at the same time to be infiltrated into the penetrating portion (11b) of the ceramic material (11).

Description

 Joining materials of different materials {JOINING METHOD OF A DIFFERENT MATERIAL}

The present invention relates to a method for joining dissimilar materials, and more particularly, to bond dissimilar materials having different hardness, such as copper (Cu) and aluminum (Al), which are plug-in terminal materials for hybrid vehicle batteries. The present invention relates to a method for joining dissimilar materials in which forging is performed without welding, and is firmly joined.

In general, various methods may be applied to joining different materials, that is, materials having different hardness.

In particular, the hybrid terminal of the hybrid vehicle battery consisting of a volume provided with a connecting terminal for providing a portion that is coupled to the electrode on one side and a screw portion for fixing the electrode to the battery on the other side, while providing a portion for connecting the external wires Friction welding method is mainly applied to join copper and aluminum which are plug-in terminal materials.

The friction welding method is a welding method for joining metals using frictional heat. The friction welding method is a method of connecting a rotating body tool made of carbon steel and alloy steel with frictional heat, which is rotated while applying pressure against two materials.

However, in the conventional friction welding method used to join different kinds of materials as described above, it is cumbersome to make the welding conditions finely by cutting the material before the friction welding, processing the surface to be joined and making the same length. There is a problem of low productivity.

In addition, the welding state should be checked after welding, but for this purpose, it is impossible except for work through non-destructive inspection (by expensive equipment such as tomography through radiation).

In addition, if the bonding state is not good, there is a fatal problem that breakage occurs, such as detached while the joint is cracked.

In addition, since the forging operation is made by cutting so as to progress the forging operation after cutting, there is a problem that the manufacturing work is cumbersome and the productivity is significantly lowered.

In order to solve the problems of the conventional heterogeneous material bonding method as described above, the present invention does not bond or weld heterogeneous materials having different hardness, for example, copper (Cu) and aluminum (Al), which are plug-in terminal materials of a hybrid vehicle battery. The objective is to provide a method for joining heterogeneous materials that is firmly bonded through forging.

In the present invention for achieving the above object, in the bonding method of heterogeneous materials having different hardness, the low hardness material 12 soaks into the outer shape of the bonding end 11a of the high hardness material 11 during the forging process. Penetrating part forming step of forming a penetrating part (11b) to provide a space to combine the heterogeneous material (S100); Heterogeneous material assembly step (S200) of assembling the bonding end (12a) of the low hardness material 12 in the outer diameter of the bonding end (11a) of the high hardness material (11) formed with the penetrating portion (11b); Among the assembled dissimilar materials, the low hardness material 12 is inserted into the mold 20 and the high hardness material 11 is punched by the press 30 from above, and the low hardness material 12 is deformed by pressure to form a high diameter. It is characterized in that it comprises a; forging step (S300) for infiltrating into the penetrating portion (11b) of the ceramic material 11 and at the same time as the primary shape of the high hardness material.

The present invention by the problem solving means as described above by joining the heterogeneous materials of different hardness by forging rather than the friction welding method, it is possible to improve the workability and productivity by simplifying the preliminary preparatory work related to the processing of the joint. have.

In addition, the low hardness material penetrates into the penetrating portion of the high hardness material while penetrating and deforming, thereby preventing the bonding state from being broken by external pressure, thereby maintaining a firm bonding state.

In addition, since the joining is made in the forging process, it is possible to eliminate the work forcing the need to proceed a separate forging after the joining process and improve productivity.

Further, by forming the penetrating portion in the outer diameter of the high hardness material, it is possible to improve the ease of processing associated with the preliminary preparation work compared to the processing method for forming the penetrating portion in the inner diameter.

1 is a sequence block diagram showing a simplified sequence of steps in accordance with an embodiment of the present invention.
2 to 7 is a cross-sectional view and a perspective view showing in more detail the progress step and the result according to an embodiment of the present invention.
8 and 9 are a perspective view showing a state and the result of the further progress of the trimming step in an embodiment of the present invention.
10 is a perspective view illustratively showing the resultant of the joined dissimilar material obtained by the present invention.

The present invention will now be described with reference to the accompanying drawings.

First, as shown in FIG. 1, the present invention provides a method of joining heterogeneous materials having different hardnesses, wherein the low hardness material 12 is formed at the outer diameter of the bonding end 11a of the high hardness material 11 during the forging process. Penetrating part forming step of forming a penetrating part (11b) to combine the heterogeneous material by providing a space that can penetrate into the shape deformation; Heterogeneous material assembly step (S200) of assembling the bonding end (12a) of the low hardness material 12 in the outer diameter of the bonding end (11a) of the high hardness material (11) formed with the penetrating portion (11b); Among the assembled dissimilar materials, the low hardness material 12 is inserted into the mold 20 and the high hardness material 11 is punched by the press 30 from above, and the low hardness material 12 is deformed by pressure to form a high diameter. It may be proceeded to include; forging step (S300) for the first shape of the appearance of the high-hardness material at the same time as to penetrate into the penetrating portion (11b) of the ceramic material (11).

The high hardness material 11 may be copper (Cu), and the low hardness material 12 may be aluminum (Al).

On the other hand, the penetrating part forming step (S100) of the present invention is the one side end of copper, that is, the high-hardness material 11 is provided in the form of a pin, that is, the annular groove-shaped penetrating portion (11b) in the outer diameter of the junction (11a) Can be formed.

In this case, the annular groove that may be the penetrating portion 11b may be circular, elliptical, polygonal, or toothed, and the plurality of circular grooves may be formed at different positions. 2 lines 3 lines) can be formed.

In addition, the outer diameter itself of the junction end 11a may be circular, elliptical, polygonal, or toothed.

Then, in the forging process, the low hardness material 12 penetrates into the shape of the low hardness material 12 at the outer diameter of the bonding end 11a of the high hardness material 11, thereby bonding, ie, bonding the different materials.

On the other hand, the dissimilar material assembly step (S200) of the present invention, one end is open to the outer diameter of the bonding end (11a) formed of the copper penetrating portion (11b) of the high hardness material 11 provided in the form of pins or rods The other end may be fixed by inserting aluminum, which is a low hardness material 12 provided in the form of a blocked cap.

Until this time, only the high hardness material 11 and the low hardness material 12 are assembled, but the bonding is not made.

On the other hand, the forging molding step (S300) of the present invention inserts the low hardness material 12 in the mold 20 having a diameter larger than the diameter of the low hardness material 12 of the heterogeneous material, the high hardness material above the mold 11 preparing to expose (S310); The press 30 descends in the vertical direction of the high hardness material 11 exposed above the mold 20 to apply pressure to the low hardness material 12 through pressurization to deform the mold to penetrate the high hardness material 11. While penetrating into the portion (11b) to be infiltrated and coupled, the deformation of the high hardness material (11) in accordance with the shape of the press 30 through the pressure that is further lowered and lowered after the deformation penetration of the low hardness material (12) Molding step (S320) to form; can be carried out including.

At this time, the forging step (S300) may be cold forging (형 成形). That is, forging molding can be performed at a low temperature or room temperature (room temperature) below the recrystallization temperature of the material.

In addition, the inner lower surface of the mold 20 protrudes upward in a conical shape to form a rivet groove 12b, which is a conical groove at the lower end of the low hardness material 12, to subsequently rivet the finished material with other articles You can also make it work.

In addition, the upper outer surface of the mold 20, that is, the surface corresponding to the press 30 may have a shape for determining the shape of the high hardness material 11.

In addition, the present invention may further include a trimming step S400 of cutting the high hardness material 11 into a specific shape after the forging step S300.

The trimming step (S400) is a step of forming the overall basic shape of the article to be completed, the separate trimming cutting hole 40 can be lowered to form a forged molded article that is guided continuously on the guide rail.

When the present invention is described in detail with reference to the drawings as follows.

First, in the penetrating part forming step (S100), the penetrating part 11b having an annular groove shape is formed at an outer diameter of the bonding end 11a, which is one end of copper, which is a high hardness material 11 processed in a pin shape.

Then, in the forging molding step (S300) to be carried out in the future, the low hardness material 12 is pushed into the outer diameter of the high hardness material 11 to the bonding end 11a of the high hardness material 11, so that the bond between the heterogeneous material is made to join. do.

That is, the penetrating portion 11b having an annular groove shape is formed at a position corresponding to the middle portion of the inner diameter of the low hardness material 12 fitted into the outer diameter of the bonding end 11a of the high hardness material 11.

In this case, the annular groove which may be the penetrating portion 11b applies any one of a circular or ellipse or polygon or tooth (gear) shape, and the outer end itself of the junction 11a is also circular or ellipse or polygon or tooth. Apply any of the (gear) shapes.

Subsequently, in the dissimilar material assembly step (S200), as shown in the accompanying drawings, FIGS. 2 and 3, the outer end portion 11a of the high hardness material 11 provided in the form of rods is formed at the outer diameter of the joint end 11a. It is fixed by inserting the aluminum of hardness material 12.

That is, one end is open to the outer diameter of the bonding end (11a) formed in the penetrating portion (11b) of the high hardness material (11) provided in the form of rods or pins low hardness material (12) provided in the form of a cap blocked ) To fix it.

Thereafter, as shown in Figure 4 to Figure 6, the forging step (S300) proceeds.

In the preparation step (S310) of the forging molding step (S300), as shown in Figures 4 and 5, the low hardness material 12 in the mold 20 of a diameter larger than the diameter of the low hardness material 12 of the heterogeneous material (12) ) Is inserted and the high hardness material 11 is exposed above the mold.

At this time, the diameter of the mold 20 is larger than the diameter of the low hardness material 12 provides a space in which the low hardness material 12 is to be deformed by the pressure in the forging process, so that the high hardness material 11 This is to be guided to the penetrating portion (11b) formed in the, and to permeate without gap according to the shape of the other mold inside.

In addition, in the forming step (S320) of the forging molding step (S300), as shown in Figure 6, the press 30 in the vertical direction of the high-hardness material 11 exposed above the mold 20 is lowered When pressurized, the shape deformation occurs primarily on the hard material 12, which is relatively harder than the hard material 11, and as described above, the penetrating portion 11b of the high hardness material 11 As the material is pushed in, it penetrates and fills the penetration 11b.

Then, the low hardness material 12 is sandwiched in the penetrating portion (11b) to be coupled to the high hardness material (11), resulting in a bonded state.

Subsequently, after the deformation penetration into the penetrating portion 11b of the low hardness material 12 as described above, when the press 30 is further lowered and the pressure is increased, the high hardness material 11 according to the shape of the press 30. ) Is secondaryly deformed and molded according to the shape of the pressing surface of the press 30 to complete the article as shown in FIG. 7.

At this time, the inner lower surface of the mold 20 protrudes upward in a conical shape to form a conical groove at the lower end of the low-hardness material 12, so that the finished material is riveted to other articles afterwards.

In addition, the present invention further includes a trimming step S400 of cutting the portion of the high hardness material 11 into a specific shape as shown in FIGS. 8 and 9 after the forging step S300. .

That is, a separate trimming cutting hole 40 is lowered from the upper portion of the forged molded article which is continuously guided on the guide rail to form a substantially finished product through punching.

The present invention thus achieved by joining the dissimilar materials of different hardness through forging molding rather than the friction welding method, thereby simplifying the preliminary preparation work related to the processing of the joint to improve workability and productivity.

In addition, the low hardness material 12 penetrates into the penetrating portion 11b of the high hardness material 11 while being deformed in shape, thereby preventing the bonding state from being broken by external pressure, thereby maintaining a firm bonding state. .

In addition, since the joining is made in the forging process, it eliminates the trouble of work that has to be carried out a separate forging after the joining process and improves the productivity.

In addition, by forming the penetrating portion (11b) in the outer diameter of the high hardness material 11, it can be improved by the ease of processing associated with the pre-preparation work compared to the processing method for forming the penetrating portion in the inner diameter.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims.

Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

S100: Penetration stage S200: Dissimilar material assembly stage
S300: Forging step S310: Preparation step
S320: forming step S400: trimming step
10: molded article 11: high hardness material
11a: junction 11b: penetration
12: low hardness material 12a: junction
12b: Rivet Groove

Claims (9)

In the joining method of dissimilar materials having different hardness, the dissimilar materials are provided with a space where the low hardness material 12 penetrates into the outer diameter of the bonding end 11a of the high hardness material 11 during the forging process. Penetrating part forming step of forming a penetrating part (11b) to couple the (S100); Heterogeneous material assembly step (S200) of assembling the bonding end (12a) of the low hardness material 12 in the outer diameter of the bonding end (11a) of the high hardness material (11) formed with the penetrating portion (11b); Among the assembled dissimilar materials, the low hardness material 12 is inserted into the mold 20 and the high hardness material 11 is punched by the press 30 from above, and the low hardness material 12 is deformed by pressure to form a high diameter. Heterogeneous material bonding method characterized in that it proceeds; soaking into the penetrating portion (11b) of the ceramic material (11) and at the same time the forging molding step (S300) for primary molding the appearance of the high hardness material.
The method of claim 1,
The penetrating part forming step (S100) is characterized in that to form an annular groove-shaped penetrating part (11b) on one side end of the high-hardness material 11, which is processed and provided in the form of a pin, that is, the outer diameter of the bonding end (11a). Heterogeneous material bonding method.
The method of claim 1,
The penetration groove (11b) is a ring groove is heterogeneous material joining method characterized in that it is processed into any one of a circular or ellipse or polygonal or toothed shape.
The method of claim 1,
The outer end of the bonding end (11a) is heterogeneous material joining method characterized in that it is processed into any one of a circular or ellipse or polygonal or toothed shape.
The method of claim 1,
The dissimilar material assembling step (S200) is one end is open and the other end is closed on the outer diameter of the bonding end (11a) formed in the copper penetrating portion (11b) of the high hardness material 11 provided in the form of pins or rods Heterogeneous material joining method, characterized in that by fixing by inserting a low hardness material (12) of aluminum provided in the form.
The method of claim 1,
The forging molding step (S300) inserts the low hardness material 12 into the mold 20 having a diameter larger than the diameter of the low hardness material 12 of the heterogeneous material, and exposes the high hardness material 11 above the mold. Preparation step (S310); The press 30 descends in the vertical direction of the high hardness material 11 exposed above the mold 20 to apply pressure to the low hardness material 12 through pressurization to deform the mold to penetrate the high hardness material 11. While penetrating into the portion (11b) to be infiltrated and coupled, the deformation of the high hardness material (11) in accordance with the shape of the press 30 through the pressure that is further lowered and lowered after the deformation penetration of the low hardness material (12) Heterogeneous material bonding method comprising the; forming step (S320) for molding.
The method of claim 1,
The forging step (S300) is a heterogeneous material bonding method characterized in that the cold forging for performing the forging at a low temperature or room temperature below the recrystallization temperature of the material.
The method of claim 1,
After the forging molding step (S300) is a heterogeneous material bonding method characterized in that it further comprises a trimming step (S400) for cutting by molding a portion of the high hardness material (11) to a specific shape.
The method of claim 8,
The trimming step (S400) is a step of forming the overall basic shape of the article to be finished, characterized in that the separate trimming cutting hole 40 is lowered to form a forged molded article that is guided continuously on the guide rail Heterogeneous material bonding method.

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