Heterogeneous material component assembly and method for assembling same

Abstract

The present invention relates to a heterogeneous material component assembly and a method for assembling same. The present invention comprises: a main body manufacturing step of manufacturing a main body including a step groove part having a plurality of steps provided continuously, each step including a vertical surface and a horizontal surface formed to adjoin the vertical surface; an assembly manufacturing step of manufacturing an assembly including a plurality of step protrusion parts provided continuously, each step protrusion part including a vertical surface and a horizontal surface corresponding to each step of the main body step groove part, by using a material having a melting point higher than that of the main body; an insertion step of inserting the step protrusion parts of the assembly into the step groove parts of the main body such that the horizontal surface of each step of the step protrusion parts contacts the horizontal surface of each step of the step groove parts; a pressing step of pressing the upper surface of the assembly with a laser tool of a laser generator; and a thermal bonding step of generating a laser from the laser generator and emitting the laser toward the vertical surface of the assembly through the laser tool such that the bottom horizontal surface and the horizontal surface of each step of the step groove parts are melted through heating. According to the present invention, not only is the configuration simple, but also the coupling strength is high, and the sealing force (watertightness) is increased with a simple configuration without a separate adhesive or sealing member.

Description

Assembly of heterogeneous material parts and method of joining the same

[0001] The present invention relates to a combination of heterogeneous material parts and a method of combining the same.

[0002] In the field of industrial equipment, fastening elements that securely connect two parts are essential components. Fastening elements include bolts, nuts, screws, welding, and adhesives.

[0003] Bolt and nut fastening is the most widely used fastening method, connecting two parts by inserting a bolt into a hole and tightening it with a nut. While bolt and nut fastening methods are easy to assemble and disassemble and can be selected according to application as they are manufactured in various sizes and materials, they require space to tighten the nut, and loosening may occur in environments with severe vibration.

[0004] The fastening method using screws is similar to bolts, but instead of a nut, screw threads are machined into the parts to be fastened. It can be assembled more simply than bolts and is suitable for use in confined spaces, but screw threads must be machined into the parts to be fastened.

[0005] For example, when assembling a product to a plastic body using metal or plastic screws, the screws are fastened using the rotational force of a screwdriver or power tool. In such cases, physical vibration loads are generated on the plastic body during the fastening process, which may cause plastic or metal dust to be generated, and the structure becomes complex as anti-loosening washers are added to prevent loosening.

[0006] The objective of the present invention is to provide a heterogeneous material component assembly that is not only simple in structure but also has high bonding strength, and a method for joining the same.

[0007] Another objective of the present invention is to provide a combination of heterogeneous material parts that increases sealing strength (water tightness) and a method of combining the same.

[0008] A heterogeneous material component assembly for achieving the objective of the present invention comprises: a main body having a step groove portion having a plurality of steps formed by a vertical surface and a horizontal surface formed following the vertical surface; a component having a step projection portion having a plurality of steps formed by a vertical surface and a horizontal surface corresponding to the step of the main body step groove portion, and having a higher melting point than the main body; fused portions formed by melting the horizontal surface of each step of the step groove portion while the step projection portion of the component is inserted into and contacts the step groove portion of the main body; and hardened bonded portions formed by flowing a molten material in which the horizontal surface of the step groove portion is melted between the vertical surface of each step of the main body step groove portion and the vertical surface of each step of the component step projection portion.

[0009] In addition, the method for combining heterogeneous material components comprises: a main body manufacturing step of manufacturing a main body having a step groove portion having a plurality of steps formed by a vertical surface and a horizontal surface formed following the vertical surface; a combination manufacturing step of manufacturing a combination having a step projection portion having a plurality of steps formed by a vertical surface and a horizontal surface corresponding to the step of the main body step groove portion, using a material with a higher melting point than the main body; an insertion step of inserting the step projection portion of the combination into the step groove portion of the main body so that the horizontal surface of each step of the step projection portion comes into contact with the horizontal surface of each step of the step groove portion; a pressing step of pressing the upper surface of the combination with a laser tool of a laser generator; and a fusion step of generating a laser from the laser generator and irradiating the laser in the direction of the vertical surface of the combination through the laser tool to heat-melt the horizontal surface of each step of the step groove portion and the bottom horizontal surface.

[0010] In the present invention, each horizontal plane of the multi-stage steps of the main body step groove and each horizontal plane of the multi-stage steps of the assembly step projection are fused and joined together simultaneously, and a molten material is introduced and hardened between each vertical plane of the multi-stage steps of the main body step groove and each vertical plane of the multi-stage steps of the assembly step projection to join together, thereby increasing the bonding strength between the main body step groove and the assembly step projection, as well as increasing the sealing force (watertightness) between the main body step groove and the assembly step projection, and furthermore, the configuration is simplified as it consists of a main body and an assembly.

[0011] In addition, when the horizontal planes of the main body step groove are melted by irradiating a laser, the molten material flows into the space between each vertical plane of the multi-stage steps of the main body step groove and each vertical plane of the multi-stage steps of the assembly step projection, thereby sealing the space. This seals the molten area when irradiating a laser to fuse, thereby reducing heat loss and preventing rapid solidification of the molten material, which ensures the formation of a dense structure in the fused area.

[0012] In addition, the present invention allows for increased bonding strength by increasing the contact area of ​​the molten material when a contact enlargement portion is provided on at least one of the step vertical surface of the main body step groove portion and the step vertical surface of the coupling member step projection portion.

[0013] FIG. 1 is a flowchart illustrating an embodiment of a method for joining heterogeneous material parts according to the present invention.

[0014] FIG. 2 is a cross-sectional view sequentially illustrating the process of an embodiment of a method for joining heterogeneous material components according to the present invention.

[0015] FIG. 3 is a cross-sectional view illustrating a first embodiment of a heterogeneous material component assembly according to the present invention,

[0016] FIG. 4 is a plan view illustrating a step pin constituting a first embodiment of a heterogeneous material component assembly according to the present invention.

[0017] FIG. 5 is a cross-sectional view illustrating a second embodiment of a heterogeneous material component assembly according to the present invention.

[0018] Hereinafter, embodiments of a heterogeneous material component assembly and a method of joining the same according to the present invention will be described with reference to the attached drawings.

[0019] First, in one embodiment of the method for combining heterogeneous material parts according to the present invention, as illustrated in FIGS. 1 and 2, a main body manufacturing step (S10) is carried out to manufacture a main body (10) comprising a step groove portion (11) having a plurality of steps (S) formed by a vertical surface (1) and a horizontal surface (2) formed next to the vertical surface (1) [see FIG. (2a)].

[0020] The vertical plane (1) of the step (S) means that it includes a slightly inclined vertical plane, and the horizontal plane (2) of the step (S) means that it includes a slightly inclined horizontal plane.

[0021] A laser-absorbing absorbent may be applied to the horizontal surface (2) of the main body step (S). The absorbent may be a black water-based ink containing carbon black or a pigment additive that absorbs laser wavelengths.

[0022]

[0023] After manufacturing the main body (10), a step (S20) is performed to manufacture a combination (20) including a step protrusion (21) having a plurality of steps (S') formed by a vertical surface (1') and a horizontal surface (2') corresponding to the step (S) of the main body step groove (11), using a material with a higher melting point than the main body (10) [see FIG. (2a)].

[0024] When the step projection (21) of the assembly (20) is inserted into the step groove (11) of the main body (10), a filling gap (3) is formed between the step vertical surface (1') of the assembly step projection (21) and the vertical surface (1) of the corresponding main body step groove step (S). The length of the step projection (21) of the assembly (20) is greater than the depth of the main body step groove (11).

[0025] A laser-absorbing absorbent may be applied to at least one of the step vertical surfaces (1) of the main body step groove (11) and the step vertical surface (1') of the assembly step projection (21). When a laser is irradiated, the step vertical surface absorbs some of the laser and generates heat, which facilitates the flow of molten material between the step vertical surface (1) of the main body step groove (11) and the step vertical surface (1') of the assembly step projection (21), thereby ensuring sufficient filling and increasing adhesive efficiency.

[0026] A contact enlargement portion may be provided on at least one of the step vertical surface (1) of the main body step groove portion (11) and the step vertical surface (1') of the assembly step projection portion (21). Preferably, it is provided on the step vertical surface (1') of the assembly step projection portion (21). With the molten material filled in the filling gap (3) between the step vertical surface (1) of the main body step groove portion (11) and the step vertical surface (1') of the assembly step projection portion (21), the contact area with the molten material can be increased by the contact enlargement portion, thereby increasing the bonding strength.

[0027] The contact enlargement area can be a rough surface that has been corroded.

[0028] As another example of a contact enlargement portion, the contact enlargement portion may consist of a plurality of protrusions or a plurality of filling grooves. It is preferable that the plurality of protrusions or the plurality of filling grooves be provided at regular intervals on the vertical surface of the step. The protrusions may be square or circular. The filling grooves may be square or circular.

[0029] The main body manufacturing step (S10) may be performed before the assembly manufacturing step (S20). Additionally, the main body manufacturing step (S10) and the assembly manufacturing step (S20) may be performed simultaneously.

[0030] For example, the main body (10) is an electronic component case having a boss that protrudes from the inner surface of the electronic component case and supports the PCB, and the assembly (20) can be a step pin that penetrates the PCB and is coupled to the boss.

[0031] In another example, the main body (10) may be the housing of a car headlamp, and the assembly (20) may be the lens of a car headlamp that is coupled to the car headlamp housing.

[0032]

[0033] After manufacturing the main body (10) and the assembly (20), an insertion step (S30) is performed in which the step projection (21) of the assembly (20) is inserted into the step groove (11) of the main body (10) so that the horizontal surface (2') of each step (S') of the step projection (21) comes into contact with the horizontal surface (2) of each step (S) of the step groove (11). At this time, the lower surface of the step projection (21) comes into contact with the bottom horizontal surface (4) of the step groove (11) [see FIG. (2b)].

[0034]

[0035] After inserting the step projection (21) of the assembly (20) into the step groove (11) of the main body (10), a pressing step (S40) is performed in which the upper surface of the assembly (20) is pressed with a laser tool of a laser generator [see FIG. (2c)].

[0036]

[0037] While the upper surface of the assembly (20) is being pressed with a laser tool, a laser is generated from a laser generator and the laser is irradiated through the laser tool in the direction of the vertical surface (1') of the assembly (20) to heat and melt the horizontal surface (2) and the bottom horizontal surface (4) of each step (S) of the step groove (11) [see FIG. (2c)].

[0038] That is, the laser through the laser tool is irradiated in a vertical direction with respect to the horizontal plane (2) and the bottom horizontal plane (4) of each step (S) of the step groove (11).

[0039] The laser irradiated through the laser tool passes through the step projection (21) of the assembly (20) and is absorbed by the horizontal plane (2) of the step groove (11) of the main body (10), that is, the horizontal plane (2) of the steps (S) and the bottom horizontal plane (4), thereby causing the step groove step (S) of the main body (10) to heat and melt each horizontal plane (2) and the bottom horizontal plane (4), and the molten material flows into the filling gap (3) between each vertical plane (1) of the main body step groove step (S) and each vertical plane (1') of the assembly step projection step (S') by the pressure of the horizontal plane (2') of the assembly (20) and fills the filling gap (3).

[0040]

[0041] After irradiating the horizontal plane (2) of the main body step groove (11) with a laser at a set time, stop the laser irradiation, move the laser tool upward to release the pressure, and cool the molten material at room temperature [see Fig. (2d)].

[0042] Each horizontal surface (2) and bottom horizontal surface (4) of the step groove steps (S) of the main body (10) are fused and hardened to each horizontal surface (2') and bottom surface of the step projection steps (S') of the assembly, respectively, to form a fused portion (30), and the molten material that flows into and fills the filling gap (3) between each vertical surface (1) of the step groove steps (S) of the main body (10) and each vertical surface (1') of the step projection steps (S') of the assembly (20) is hardened to form a hardened bonding portion (40).

[0043] In this way, each horizontal plane (2) of the multi-stage steps (S) of the main body step groove (11) and each horizontal plane (2') of the multi-stage steps (S') of the assembly (20) are fused and joined, and a molten material is introduced and hardened between each vertical plane (1) of the multi-stage steps (S) of the main body step groove (11) and each vertical plane (1') of the multi-stage steps (S') of the assembly (20), thereby joining. This not only increases the bonding strength between the main body step groove (11) and the assembly (20) step projection (21), but also increases the sealing force (watertightness) between the main body step groove (11) and the assembly (20) step projection (21).

[0044] In addition, when the horizontal planes (1) of the main body step groove (11) are melted by irradiating a laser, the molten material flows into the vertical planes (1) of the multi-stage steps (S) of the main body step groove (11) and the vertical planes (1') of the multi-stage steps (S') of the assembly (20) to seal, so that when the laser is irradiated to fuse, the molten part is sealed, reducing heat loss and preventing rapid solidification of the molten material, thereby ensuring the formation of a dense structure of the fused part (30).

[0045] In addition, if a contact enlargement portion is provided on at least one of the step vertical surface (1) of the main body step groove portion (11) and the step vertical surface (1') of the assembly step projection portion (21), the contact area of ​​the molten material can be increased to further increase the bonding strength.

[0046] In addition, when a laser-absorbing absorbent is applied to at least one of the step vertical surfaces (1) of the main body step groove (11) and the step vertical surface (1') of the assembly step projection (21), the laser absorbs some of the laser when irradiated, thereby heating the step vertical surface and facilitating the flow of molten material between the step vertical surface (1) of the main body step groove (11) and the step vertical surface (1') of the assembly step projection (21), so that not only is sufficient filling achieved, but the adhesive efficiency can also be increased.

[0047]

[0048] An embodiment of a heterogeneous material component assembly according to the present invention is described.

[0049] One embodiment of a heterogeneous material component assembly according to the present invention comprises: a main body having a step groove portion having a plurality of steps formed continuously from a horizontal plane and a vertical plane following the horizontal plane; a combination having a step projection portion having a plurality of steps formed continuously from a horizontal plane and a vertical plane corresponding to the steps of the main body step groove portion, and having a higher melting point than the main body; fused portions in which the horizontal plane of each step of the step groove portion is melted and fused to the horizontal plane of each step of the step projection portion while the step projection portion of the combination is inserted into and contacts the step groove portion of the main body; and hardened bonded portions in which a molten material in which the horizontal plane of the step groove portion is melted flows between the vertical plane of each step of the main body step groove portion and the vertical plane of each step of the combination step projection portion.

[0050]

[0051] [First embodiment of a heterogeneous material component assembly]

[0052] A first embodiment of a heterogeneous material component assembly is, as shown in FIG. 3, an electronic component case (10A) having a boss (12) that protrudes from the inner surface and supports a PCB (50), and a component is a step pin (20A) that penetrates the PCB and is coupled to the boss.

[0053] A boss (12) provided inside the main body electronic component case (10A) protrudes in the shape of a round bar, and a step groove (11) is formed at a set depth from the upper surface of the boss (12).

[0054] The step groove section (11) of the boss (12) is provided with a plurality of steps (S) formed by a vertical surface (1) and a horizontal surface (2) formed following the vertical surface (1). For example, the step groove section (11) is composed of a first circular groove having a certain inner diameter and depth, a second circular groove formed on the bottom surface of the first circular groove with a certain depth and an inner diameter smaller than the inner diameter of the first circular groove, a third circular groove formed on the bottom surface of the second circular groove with a certain depth and an inner diameter smaller than the inner diameter of the second circular groove, and a fourth circular groove formed on the bottom surface of the third circular groove with a certain depth and an inner diameter smaller than the inner diameter of the third circular groove. Each bottom surface of the first, second, third, and fourth circular grooves is a horizontal surface (2) and each outer surface is a vertical surface (1), and the vertical surface (1) and horizontal surface (2) of the first, second, third, and fourth circular grooves become steps (S). It is desirable that the first, second, third, and fourth circular grooves each have the same centerline.

[0055] The step pin (20A), which is a combination, is composed of a polygonal head portion (23) having a uniform thickness, a step projection portion (21) extending from the lower surface of the head portion (23), and a wrench insertion groove (24) formed to a certain depth on the upper surface of the head portion (23). As shown in FIG. 4, the wrench insertion groove (24) is formed in a square or hexagonal shape. The step pin (20A) is made of a material with a higher melting point than the electronic component case (10A). If the head portion (23) is polygonal, the wrench insertion groove (24) may be excluded.

[0056] The step protrusion (21) of the step pin (20A) is composed of a first round bar portion (25) that is extended and protruded to have a uniform outer diameter and length on the lower surface of the head portion (23), a second round bar portion (26) that is extended and protruded to have an outer diameter and length smaller than the outer diameter of the first round bar portion (25) on the lower surface of the first round bar portion (25), a third round bar portion (27) that is extended and protruded to have an outer diameter and length smaller than the outer diameter of the second round bar portion (26) on the lower surface of the second round bar portion (26), and a fourth round bar portion (28) that is extended and protruded to have an outer diameter and length smaller than the outer diameter of the third round bar portion (27) on the lower surface of the third round bar portion (27). Each lower surface of the first, second, third, and fourth round bar sections is a horizontal plane (2') and each outer surface is a vertical plane (1'), and the vertical plane (1') and horizontal plane (2') of the first, second, third, and fourth round bar sections become a step (S'). It is preferable that the first, second, third, and fourth round bar sections each have the same centerline.

[0057] The outer diameter of each of the second, third, and fourth round bar sections of the step projection (21) is formed to be smaller than the inner diameter of each of the second, third, and fourth circular grooves of the step groove (11), thereby forming a filling gap between the outer diameter of the round bar section and the inner surface of the circular groove. The length of each of the second, third, and fourth round bar sections of the step projection (21) is formed to be the same size as the depth of each of the second, third, and fourth circular grooves of the step groove (11). The outer diameter of the first round bar section (25) of the step projection (21) is smaller than the inner diameter of the first circular groove of the step groove (11), and the length of the first round bar section of the step projection (21) is greater than the depth of the first circular groove of the step groove (11).

[0058] The step projection (21) of the step pin (20A) is inserted into the boss step groove (11) of the electronic component case (10A), and the first, second, third, and fourth round bar portions of the step projection (21) are inserted into the first, second, third, and fourth circular grooves of the step groove (11), respectively, and each horizontal plane (2') of the steps (S') of the step projection (21) is connected to each horizontal plane (2) of the steps (S) of the step groove (11), and the connection is made by a fused portion (30) in which the horizontal plane (2) of each step (S) of the step groove (11) is melted and fused to the horizontal plane (2') of each step (S') of the step projection (21), and the filling gap is between each step vertical plane (1) of the boss step groove (11) and each step vertical plane (1') of the step projection (21) of the step pin (20A). The horizontal surface (2) of the step groove (11) is provided with hardened bonding sections (40) into which molten material is introduced and hardened.

[0059] A PCB (50) is positioned and fixed between the upper surface of the boss (12) of the electronic component case (10A) and the lower surface of the head portion (23) of the step pin (20A). That is, with the PCB (50) positioned on the upper surface of the boss (12), the first round bar portion (25) of the step pin (20A) penetrates the coupling hole of the PCB (50), and the lower surface of the head portion (23) of the step pin (20A) supports and fixes the edge of the coupling hole of the PCB (50).

[0060] Meanwhile, in order to strengthen the contact force between the step vertical surface (1) of the boss step groove (11) of the electronic component case (10A) and the step vertical surface (1') of the step projection (21) of the step pin (20A), a contact enlargement portion may be provided on at least one of the step vertical surface (1) of the boss step groove (11) and the step vertical surface (1') of the step pin step projection (21). As an example of a contact enlargement portion, the contact enlargement portion may be a rough surface that has been corroded.

[0061] The first embodiment of a heterogeneous material component assembly is provided with welded portions (30) in which the horizontal surfaces (2) of the first, second, third, and fourth circular grooves of the step groove portion (11) of the electronic component case boss (12) are melted and fused to the horizontal surfaces (2') of the first, second, third, and fourth round bar portions of the step pin step projection portion (21), and also provided with hardened bonding portions (40) in which the molten material from the melted horizontal surfaces (2) of the first, second, third, and fourth circular grooves of the step groove portion (11) of the boss (12) flows into the filling gap between the vertical surfaces (1) of the first, second, third, and fourth circular grooves of the step groove portion (11) of the boss (12) and the vertical surfaces (1') of the first, second, third, and fourth round bar portions of the step pin step projection portion (21) and hardens, thereby greatly increasing the bonding strength between the boss (12) of the electronic component case (10A) and the step pin (20A), and the electronic product The sealing force (watertightness) between the boss step groove (11) of the case (10A) and the step projection (21) of the step pin (20A) is increased.

[0062]

[0063] [Second embodiment of a heterogeneous material component assembly]

[0064] A second embodiment of a heterogeneous material component assembly is, as shown in FIG. 5, the main body is a housing (10B) of an automobile headlamp, and the assembly is a lens (20B) of an automobile headlamp that covers the automobile headlamp housing (10B).

[0065] A step groove (11) is formed at a set depth in the connection part of the main body, the automobile headlamp housing (10B).

[0066] The step groove portion (11) of the housing (10B) is provided with a plurality of steps (S) formed by a vertical surface (1) and a horizontal surface (2) formed adjacent to the vertical surface (1). That is, the step groove portion (11) is composed of an insertion groove having width and depth and a plurality of steps (S) formed continuously on one inner side of the insertion groove. The steps (S) are composed of a first groove-side step (S1) consisting of a first vertical plane (1) extending to a certain height from the bottom horizontal plane (6) of the insertion groove and a first horizontal plane (2) formed horizontally at one end of the first vertical plane (1); a second groove-side step (S2) consisting of a second vertical plane (1) formed vertically at one end of the first horizontal plane (1) and a second horizontal plane (2) formed horizontally at the end of the second vertical plane (1); and a third groove-side step (S3) consisting of a third vertical plane (1) formed vertically at one end of the second horizontal plane (2) and a third horizontal plane (2) formed horizontally at the end of the third vertical plane (1). An auxiliary vertical plane (4) is formed vertically at one end of the third horizontal plane (2), and an upper horizontal plane (5) is formed at the end of the auxiliary vertical plane (4). The width of the step groove (11) increases as it goes from the first step (S1) on the groove side to the third step (S3) on the groove side.

[0067] A step projection (21) is formed protruding from the connecting part of the combined automobile headlamp lens (20B).

[0068] The step projection (21) of the lens (20B) has one side having a single surface and the other side having a step (S') formed by a vertical surface (1') and a horizontal surface (2') formed following the vertical surface (1'), and is provided with a plurality of steps in succession. That is, the step protrusion (21) is composed of a first step (S'1) on the protrusion side, which consists of a first vertical surface (1') extending to a certain height from one end of the end surface of the lower horizontal surface (7) and a first horizontal surface (2') formed in a horizontal direction from the end of the first vertical surface (1'); a second step (S'2) on the protrusion side, which consists of a second vertical surface (1') formed vertically from one end of the first horizontal surface (2') and a second horizontal surface (2') formed in a horizontal direction from the end of the second vertical surface (1'); and a third step (S'3) on the protrusion side, which consists of a third vertical surface (1') formed in a vertical direction from one end of the second horizontal surface (2') and a third horizontal surface (2') formed in a horizontal direction from the end of the third vertical surface (1'). The vertical surface formed at one end of the third horizontal surface (2') becomes one side of the connecting part. The step projection (21) becomes thicker as it goes from the first step (S'1) on the projection side to the third step (S'3) on the projection side.

[0069] The step projection (21) of the head lamp lens (20B) is inserted into the step groove (11) of the head lamp housing (10B), so that the horizontal planes (1') of the first, second, and third steps on the projection side of the step projection (21) each come into contact with the horizontal planes (1) of the first, second, and third steps on the groove side of the step groove (11), respectively, and the side surface of the other side of the step projection (21) comes into contact with the inner surface of the other side of the step groove (11). At this time, the thickness of each of the first, second, and third steps (S'1)(S'2)(S'3) on the protruding side of the step portion of the head lamp lens (20B) is formed to be smaller than the width between each of the first, second, and third steps (S1)(S2)(S3) on the groove side of the step portion of the head lamp housing (10B) and one inner surface, thereby forming a filling gap between the first, second, and third vertical surfaces of the step portion of the head lamp lens (20B) and the first, second, and third vertical surfaces of the step portion of the head lamp housing (10B).

[0070] Fusion portions (30) are provided on the first, second, and third horizontal planes (1) of the first, second, and third steps (S1), (S2), and (S3) of the head lamp housing step groove portion (11), and on the bottom surface (6), which are each horizontal planes (1), and the first, second, and third vertical planes (1') of the first, second, and third steps (S'1), (S'2), and (S'3) of the step projection portion (21), and on one side, and between the first, second, and third vertical planes (1') of the first, second, and third steps (S1), (S2), and (S3) of the step groove portion (11) and the auxiliary vertical plane (4), the first, second, and third horizontal planes (1) of the first, second, and third steps (S'1), (S'2), and (S'3) of the step projection portion (21), and the bottom horizontal plane (7) which is the end surface, are each formed by the inflow of a molten material and the hardening of the end surface. Hardened bonding parts (40) are provided.

[0071] Meanwhile, in order to strengthen the contact force between the first, second, and third vertical surfaces (1) of the first, second, and third steps (S'1)(S'2)(S'3) of the head lamp lens step protrusion (21) and one side surface, and the first, second, and third vertical surfaces (1) of the first, second, and third steps (S1)(S2)(S3) of the head lamp housing step groove (11) and the auxiliary vertical surface (4), a contact enlargement portion may be provided on at least one step vertical surface (1') among the step vertical surfaces (1) of the step groove (11) and the step vertical surfaces of the step protrusion (21). It is preferable that the contact enlargement portion be provided on the first, second, and third vertical surfaces (1) of the first, second, and third steps (S1)(S2)(S3) of the head lamp housing step groove (11) and the auxiliary vertical surface (4), respectively. As an example of a contact enlargement part, the contact enlargement part may be an etched rough surface. As another example of a contact enlargement part, the contact enlargement part may be a plurality of square protrusions or a plurality of square grooves.

[0072] A second embodiment of a heterogeneous material component assembly is provided with fused portions (30) in which the first, second, and third horizontal planes (2) and horizontal bottom planes (6), which are each of the first, second, and third steps (S1)(S2)(S3) of the head lamp housing step groove portion (11), are each melted and fused to the first, second, and third vertical planes (1'), which are each of the first, second, and third steps (S'1)(S'2)(S'3) of the head lamp lens step projection portion (21), respectively, and also includes the first, second, and third vertical planes (1'), which are each of the first, second, and third steps (S'1)(S'2)(S'3) of the head lamp lens step projection portion (21), one side, the first, second, and third vertical planes (1), which are each of the first, second, and third steps (S1)(S2)(S3) of the head lamp housing step groove portion (11), and auxiliary The molten material flows into each of the vertical surfaces (4) and hardened hardened bonding portions (40) are provided, so that the bonding strength between the head lamp housing (10B) and the head lamp lens (20B) is high, and the sealing force between the head lamp housing step groove portion (11) and the head lamp lens step projection portion (21) is increased.

Claims

1. A main body comprising a step groove section having a plurality of steps formed continuously, each step consisting of a vertical surface and a horizontal surface formed adjacent to the vertical surface; A composite body made of a material having a higher melting point than the main body, comprising a step projection portion having a plurality of steps formed in a vertical plane and a horizontal plane corresponding to the step of the main body step groove portion, wherein the step projection portion is provided in a continuous manner; Fusion portions formed by melting the horizontal surface of each step of the step groove and fusing it to the horizontal surface of each step of the step projection while the step projection of the above assembly is inserted into and contacts the step groove of the main body; and A heterogeneous material component assembly comprising hardened bonding portions formed by introducing a molten material, in which the horizontal surface of the step groove is melted, between the vertical surface of each step of the main body step groove and the vertical surface of each step of the assembly step projection.

2. In Paragraph 1, A heterogeneous material component assembly characterized in that the main body is a housing of an automobile headlamp and the assembly is a lens of an automobile headlamp.

3. In Paragraph 1, A heterogeneous material component assembly characterized in that the main body is an electronic component case having a boss protruding from the inner surface of the electronic component case and supporting a PCB, and the assembly is a step pin that penetrates the PCB and is coupled to the boss.

4. In Paragraph 1, A heterogeneous material component assembly characterized by having a contact enlargement portion provided on at least one of the step vertical surface of the main body step groove portion and the step vertical surface of the assembly step projection portion.

5. A step for manufacturing a main body comprising a step groove portion having a plurality of steps formed continuously, each step consisting of a vertical surface and a horizontal surface formed adjacent to the vertical surface; A step of manufacturing an assembly including a step projection portion having a plurality of steps formed in a vertical plane and a horizontal plane corresponding to the step of the main body step groove portion, wherein the assembly is manufactured from a material having a higher melting point than the main body; An insertion step in which a step projection of the above assembly is inserted into a step groove of the main body to bring the horizontal plane of each step of the step projection into contact with the horizontal plane of each step of the step groove; A pressing step of pressing the upper surface of the assembly with a laser tool of a laser generator; and A method for joining heterogeneous material parts, comprising a fusion step of generating a laser from the above laser generator and irradiating the laser in the direction of the vertical plane of the assembly through the above laser tool to heat and melt the horizontal plane of each step of the step groove and the bottom horizontal plane.

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