JP5283028B1 - Metal member joining method and metal member joined body - Google Patents

Abstract

[PROBLEMS] A simple method that reduces the number of processes and facilitates component management, but can squeeze two metal members without using rivets and can perform substantial rivet caulking, equivalent to a rivet joining method. It is another object of the present invention to provide a metal member bonding method and a metal member bonded body having a bonding force higher than that.
The first metal member is overlapped with a second metal member having a through-hole opened at an appropriate position, and the first metal member is formed by a pressing punch having a diameter larger than the diameter of the through-hole. Is pressed from above the through hole of the second metal member to cause the front portion of the first metal member to be recessed, and is flowed by the press of the punch to penetrate the through hole of the second metal member. The first metal member and the second metal member are joined by caulking a protruding portion that is formed by a part of the first metal member and protrudes from the second metal member.
[Selection] Figure 3

Description

  The present invention relates to a method for joining metal members using a metal member itself as a base material.

  2. Description of the Related Art Conventionally, as a reliable joining method for joining another metal member to a metal member, a method for joining using a rivet that is a joining member is known. In this method of joining using rivets, a rivet hole is established at an appropriate position of the flat plate portion of one metal member, and a rivet hole corresponding to the rivet hole is provided at an appropriate position of the flat plate portion of the other member. Open. Then, the two members are overlapped, and the rivet is inserted into the communicating rivet hole, and the tip of the rivet is caulked to form a machining head, thereby joining the two members.

  However, according to the above-described joining method using rivets, when a gap is generated between the rivet and the metal member, the coupling quality is deteriorated. Therefore, it is necessary to provide rivet holes corresponding to the hole diameter of the rivet shaft portion in each metal member, and to provide rivet holes at an appropriate pitch in each metal member. Both of these processes required very high accuracy, and required a lot of work and cost for processing.

  In addition, when using a rivet other than the standard size, it is necessary to produce the rivet itself, and in particular, joining a metal member in a small amount is a joining method that is unsuitable in terms of cost and component management.

  Further, skillful skill is required to perform highly reliable joining using rivets.

  Therefore, a method for joining metal members using a metal member itself as a base material without using a joining member such as a rivet in order to reduce work steps and facilitate component management is known (for example, , See Patent Document 1).

  The joining method involves joining a material to be joined, which is a thin metal plate, to a joining material, which is a thick metal plate, and forming a through-hole in a joining portion of the material to be joined in advance, and placing both the materials on a die. After being placed on the surface of the bonding material, the bonding material is pressurized with a punch from the side of the bonding material toward the through hole to be locally recessed, thereby bulging out of the through hole. The swelled portion is formed to join the thin metal plate and the thick metal plate.

  According to this joining method, since joining of metal members can be achieved only by perforating the material to be joined and pressing operation with a simple punch, no laborious work is required, and the number of work processes is reduced, thus speeding up the work. However, combined with the simplicity and low cost of the mold, it is said that the processing cost can be kept down considerably.

JP 2000-42658 A

  However, according to the above-described joining method, since it is possible to join metals using the metal member itself, which is a base material, without using a joining member, there are few work processes and parts management is easy. Since the bonding force is the same as the state of bonding by conventional burring caulking, the bonding force is weaker and the durability is lower than the case of bonding using rivets.

  Therefore, the present invention has been made in view of the above problems, and uses a rivet that is a simple method, reduces the number of steps, and facilitates component management, but has high reliability. It is an object of the present invention to provide a metal member bonding method and a metal member bonded body having a bonding force equal to or greater than that of the conventional bonding method.

  In order to solve the above problems, the metal member joining method and metal member joined body of the present invention employ the following technical means.

The metal member joining method according to the present invention is such that the first metal member and the second metal member having a through hole opened at an appropriate position are overlapped, the first metal member is directed upward, and the through hole is formed. The first metal member is placed on a die having a recess having a hole diameter substantially the same as the hole diameter by placing the through hole and the recess in correspondence with each other and a pressing punch having a diameter larger than the hole diameter of the through hole. By pressing from above the through hole of the second metal member, the front portion of the first metal member is recessed, and the fluid is pressed by the punch and passes through the through hole of the second metal member. The main surface of the second metal member on the side that is not in contact with the first metal member in a state where the protruding portion protruding from the second metal member is placed as described above , formed by a part of the first metal member Squeezed around the through hole It allows those joining the first metal member, and said second metal member.

  The first metal member and the second metal member having a through hole opened at an appropriate position are overlapped and pressed by a pressing punch having a diameter larger than the diameter of the through hole, whereby the first metal member below the punch Will receive only compressive stress. The stress of the first metal member increases as the pressing force increases, and finally exceeds the elastic limit to be in a plastic flow state.

  The fluid flows through the through hole of the second metal member, protrudes from the second metal member in a rod shape, and forms a shaft portion of a rivet.

  By caulking this protrusion, the first metal member and the second metal member can be reliably joined.

  Further, the first metal member and the second metal member are placed on the die having the recess so that the recess and the through hole of the second metal member correspond to each other so that the first metal member is on the upper side. Can be made.

  The first metal member may be thicker than the second metal member.

Further, the strength of the first metal member may be lower than the strength of the second metal member. The first metal member may be low carbon steel, and the second metal member may be high carbon steel or special steel.

  Moreover, a ring member can be fitted to the inner periphery of the through hole provided in the second metal member.

  Furthermore, the ring member can be higher than the strength of the first metal member.

The metal member bonded body of the present invention is a bonded body in which a first metal member and a second metal member having a through hole opened at an appropriate position are bonded to each other . 2 on the surface of the side that is not in contact with the metal member , a recess having a larger diameter than the through hole, and a portion of the first metal member that penetrates the through hole of the second metal member. The formed protruding portion protruding from the second metal member is caulked around the through hole of the main surface of the second metal member on the side not in contact with the first metal member . The first metal member may be low carbon steel, and the second metal member may be high carbon steel or special steel.

  According to the metal member joining method and the metal member joined body of the present invention, a rivet that is a simple method, which reduces the number of steps and facilitates component management, but has high reliability, is provided. It can have a bonding force equivalent to or higher than the bonding method used.

It is sectional drawing which shows a part of joining member before the process joined by the joining method of the metal member which concerns on 1st Embodiment of this invention. It is process drawing which shows the outline of the joining method of the metal member which concerns on 1st Embodiment of this invention. It is sectional drawing which shows a part of joined body of the metal member joined by the joining method of the metal member which concerns on 1st Embodiment of this invention. It is sectional drawing which shows a part of joined body of the metal member joined by the joining method of the metal member which concerns on 2nd Embodiment of this invention.

  Hereinafter, a metal member joining method (hereinafter referred to as a joining method) and a metal member joined body according to an embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to this embodiment.

[First Embodiment]
FIG. 1 is a cross-sectional view showing a part of a joining member before processing that is joined by the joining method according to the first embodiment. As a preparatory step before entering the bonding method step, first, as shown in FIG. 1, a part of the first metal member 1 is placed at an appropriate position of the second metal member 2 to be bonded to the first metal member 1. A through hole 2a to be penetrated is opened. Depending on the size, thickness, shape, etc. of the metal member to be joined, the through-holes 2a have an appropriate number of through-holes 2a having appropriate hole diameters at appropriate positions.

  In addition, since there is no possibility that a joint part floats or deform | transforms if a flat part of both metal members is joined to a joining location, the through-hole 2a is provided in the flat part in the 2nd metal member 2. It is preferable.

  Next, as shown in FIG. 2A, the through hole 2a is formed in the die 3 having the recess 3a by the first metal member 1 and the above-described preparatory work so that the first metal member 1 is on the upper side. The mounted second metal member 2 is placed on top of each other. At this time, the recess 3 a provided in the die 3 and the appropriate through hole 2 a of the second metal member 2 are placed in correspondence with each other.

  The hole diameter of the recess 3a of the die 3 is configured to be substantially the same as that of the through hole 2a. Further, the depth of the concave portion 3a of the die 3 is a protruding portion 1c that is formed by a part of the first metal member 1 that passes through a through hole 2a of the second metal member 2 described later, and protrudes from the second metal member 2. The depth is longer than the length. In addition, the depth of the recessed part 3a can also be comprised the same as the protrusion part 1c made to protrude.

  The recess 3 a provided in the die 3 is formed by arranging a knockout bar 5 provided at an appropriate position on the die 3 so as to be movable in the vertical direction at an appropriate position below the upper surface of the die 3. Also good.

  Further, for example, both metal members may be set by a jig that can indicate and guide the work position (not shown).

  Next, as shown in FIG. 2 (b), the first metal member 1 is pressed by the pressing punch 4 having a diameter larger than the diameter of the through hole 2 a provided in the second metal member 2. From the second metal member 2 formed by a part of the first metal member 1 that is recessed by the front part of the one metal member 1 and that is flowed by pressing the punch and penetrates the through hole 2a of the second metal member 2. A protruding portion 1c that protrudes is formed.

  More specifically, the overlapped metal members are arranged on the die 3 so that the concave portion 3a of the die 3 having substantially the same diameter as the through hole 2a provided in the second metal member 2 corresponds to the through hole 2a. Placed on. And the front part of the 1st metal member 1 is recessed by pressing from the upper direction of the through-hole 2a with the press punch 4 which has a diameter larger than the hole diameter of the through-hole 2a. Then, the first metal member 1 of the amount of the recessed portion of the first metal member 1 recessed at this time passes through the through hole 2a and is fluidly deformed so as to form a protruding portion 1c protruding from the second metal member 2. .

  That is, since the diameter of the pressing punch 4 is larger than the hole diameter of the through hole 2a of the second metal member 2 and the hole diameter of the recess 3a of the die 3, no shear stress is generated, and the first metal member 1 only receives compressive stress. Will receive. Then, the stress of the first metal member 1 increases as the pressing force increases and finally exceeds the elastic limit to be in a plastic flow state, and this fluid is shaped like a rod in a state of fitting in the through hole 2a of the second metal member 2. Extruded.

  Also, as shown in FIGS. 2A and 2B, if a wrinkle presser 6 is provided on the upper surface of the first metal member 1 so as to face the die 3 and the first metal member 1 is pressed with the press punch 4, Generation of wrinkles during processing can be prevented. Moreover, it is desirable that the center of the pressing punch 4 at the time of pressing corresponds to the center of the through hole 2a and the recess 3a.

  Further, the larger the diameter of the pressing punch 4 is, the shallower the depth of the recessed portion 1a is. However, the pressing force to be pressed is naturally increased. Therefore, the pressing punch having an appropriate diameter according to the metal member to be joined. It is desirable to use 4.

  Finally, the first metal member 1 and the second metal member 2 are joined by caulking the protruding portion 1 c protruding from the second metal member 2 to form the machining head C.

  As a method for caulking the protruding portion 1c, as shown in FIG. 2C, the protruding portion 1c can be caulked by a caulking punch 7 to form a machining head C and joined.

  More specifically, the first metal member 1 is fluidly deformed by being pressed by the pressing punch 4 and is temporarily knocked out while maintaining the state shown in FIG. 2B where the first metal member 1 is penetrated through the through hole 2a of the second metal member 2. Both metal members are pushed up by the rod 5 to be separated from the die 3 and the pressing punch 4 is removed, and then the next caulking process is started. In the caulking step, both members are placed on the die 3 having the caulking punch 7 at a position where the protruding portion 1 c corresponds to the caulking punch 7. Then, again, the pressing punch 4 is inserted into the recessed portion 1a to fix the two metal members, and the projecting portion 1c is blown by the caulking punch 7 so that the projecting portion 1c is crushed to form the machining head C. . In the caulking punch 7 shown in FIG. 2C, the processing head C is formed into a round head by pressing the caulking punch 7 whose tip side is substantially hemispherical, but the front end side of the caulking punch 7 is appropriately set. The machining head C can be changed to various shapes such as a flat head and a dish head.

  Further, as a method of fixing both metal members during the caulking step, not only the pressing punch 4 is inserted into the recessed portion 1a, but also the first metal member again facing the die 3 as shown in FIG. 2 (c). Both the metal members may be fixed by providing a wrinkle presser 6 on the upper surface of 1, or a configuration including a fixing tool that fixes the pressing punch 4 from above the first metal member 1, without being inserted into the recessed portion 1 a. It can be.

  In this caulking step, it is only necessary to join the first metal member 1 and the second metal member 2 by caulking the protruding portion 1c to form the machining head C, and the caulking method is not limited to the method described above. For example, as in the case of joining using a conventional rivet, a well-known caulking is performed such that the projecting portion 1c is crushed by hitting the projecting portion 1c with an air caulking hammer to form a machining head C. The method can be used.

  As shown in FIG. 3, the joined body of metal members joined by the joining method described above is joined to the first metal member 1 and the second metal member 2 having the through hole 2 a opened at an appropriate position. And a concave portion 1a having a diameter larger than the diameter of the through hole 2a provided in the front portion of the first metal member 1, and being formed in the through hole 2a of the second metal member 2. A joined body of metal members formed by a part of the penetrating first metal member 1 and protruding from the second metal member 2 is caulked.

  More specifically, the recessed portion 1 a provided on the surface side of the first metal portion is recessed by being pressed by the pressing punch 4, and is positioned above the through hole 2 a of the second metal member 2. Then, in this metal member joined body, the first metal portion flows by the amount of the recessed portion 1 a that is recessed by being pressed by the pressing punch 4, and is fitted to the through hole 2 a of the second metal member 2. The first metal member 1 and the second metal member 2 are joined to each other without a gap by penetrating and caulking the protruding portion 1 c protruding from the second metal member 2.

  That is, in the metal joined body joined by the joining method of the present invention, the first metal member 1 itself having the concave portion 1a on the upper side of the second metal member 2 uses a conventional rivet, as shown in FIG. When the metal members are joined together, the first metal member 1 of the penetrating portion 1b corresponding to the head A of the rivet and penetrating the through hole 2a of the second metal member 2 is the shaft portion B of the rivet. In addition, the portion where the projecting portion 1c made of the first metal member 1 is crimped corresponds to the machining head C where the tip of the rivet is crimped, and the first metal member 1 itself which is the base material becomes a rivet. Then, the second metal member 2 is joined.

  Therefore, it has at least the same joining force as the metal joined body joined by the conventional rivet. Moreover, as described above, since the first metal member 1 and the second metal member 2 are joined in a fitted state, unlike the case of using a conventional rivet that is a separate part, the rivet and the metal member There is no gap between them, and the bonding quality does not deteriorate, and it is possible to bond with higher reliability, stability and durability than a metal bonded body bonded by a conventional rivet.

  About the 1st metal member 1 and the 2nd metal member 2 which are used for this invention, it is preferable to use a thing with a big strength difference, and the intensity | strength of the 1st metal member 1 is lower than the intensity | strength of the 2nd metal member 2. The second metal member 2 is preferably a metal member having a high strength similar to that of the die 3 because the first metal member 1 can be plastically deformed as described above on the same principle as the conventional extrusion molding.

  The first metal member is preferably made of, for example, low carbon steel. As the second metal member, it is preferable to use, for example, a spring steel material (SUP6 or the like) excellent in spring property among high carbon steel or special steel.

  In addition, the first metal member 1 is more easily formed than the second metal member 2, and the second metal member 2 is preferably a thin metal member.

  As described above, according to the joining method of the embodiment of the present invention described above, it is possible to join metal members by a simple method as long as the through hole 2a is opened at an appropriate position of the second metal member 2. Therefore, compared to the conventional joining method using rivets, each joining member to be joined is provided with a rivet hole corresponding to the hole diameter of the rivet shaft portion B, and each metal member is riveted at an appropriate pitch. A processing step such as providing a hole is not necessary, and the number of steps can be reduced and the cost can be reduced.

  In addition, since the thin second metal member 2 having a large strength difference can be joined in a fit state by the first metal member 1 which is a base material without using a separate joining member, parts management becomes easy, It can be joined with a joining force equal to or greater than the joining force obtained by a conventional joining method using rivets, and is excellent in terms of reliability, stability, durability, and cost.

  Moreover, according to the joining method of this embodiment, it is also possible to join several places simultaneously, and productivity becomes high.

  Further, in the conventional joining method using rivets, the head A and the machining head C of the rivet protrude from the surface or the back surface of the joined body of metal members, respectively. When a part or the like is overlapped on the joined body of the rivet, the rivet head A and the machining head C become projections that are obstructed and cannot be joined. According to the joined body of metal members joined by the joining method, the surface on the first metal member 1 side is provided with the recessed portion 1a, but the flat plate portion does not have a conventional projection, These parts can be further joined.

[Second Embodiment]
The metal member joining method and metal member joined body of the second embodiment are substantially the same as those of the first embodiment in the basic method, configuration, and the like, except for the following points.

  The 1st metal member 1 and the 2nd metal member 2 which made the ring member 8 fit to the inner periphery of the through-hole 2a are joined by the method similar to 1st Embodiment.

  The ring member 8 fitted to the inner periphery of the through hole 2 a is formed using a material having a strength higher than that of the first metal member 1. As a material of the ring member 8, for example, high carbon copper or special steel having a strength several times higher than that of the first metal member 1 can be used.

  And the 1st metal member 1 is pressed from the upper direction of the ring member 8 fitted to the through-hole 2a of the 2nd metal member 2 with the press punch 4 which has a hole diameter larger than the hole diameter of the inner periphery of the ring member 8. Thus, the front portion of the first metal member 1 is recessed, and the protrusion that protrudes from the second metal member 2 is formed by a part of the first metal member 1 that is flowed by pressing of the punch and penetrates the ring member 8. The first metal member 1 and the second metal member 2 are joined by caulking the portion 1c.

  As shown in FIG. 4, the hole diameter of the pressing punch 4 is larger than the inner diameter of the ring member 8 and smaller than the inner diameter of the through hole 2 a of the second metal member 2. preferable.

  At this time, it is preferable that the inner diameter of the ring member 8 and the hole diameter of the recess 3a of the die 3 are substantially the same.

  And as shown in FIG. 4, the basic structure of the metal member bonded body bonded by the bonding method described above is substantially the same as the bonded body bonded by the bonding method of the first embodiment. 2 The metal member 2 penetrates through the ring member 8 fitted to the inner periphery of the through hole 2a provided in the metal member 2 with the first metal member 1 fitted.

  That is, the portion of the first metal member 1 that passes through the inside of the ring member 8 corresponds to the shaft portion B of the conventional rivet.

  The metal member to be joined in the metal member joining method according to the first embodiment is suitable as a method for joining the high strength second metal member 2 to the low strength first metal member 1 as described above. When the strength of both members is the same or similar, good bonding is difficult.

  However, according to the joining method of the second embodiment, the first metal member 1 and the second metal member 2 can be favorably joined by inserting the high-strength ring member 8 into the through hole 2a. It becomes possible.

DESCRIPTION OF SYMBOLS 1 1st metal member 1a Recessed part 1b Through-hole 1c Protrusion part 2 2nd metal member 2a Through-hole 3 Die 3a Recessed part 4 Press punch 5 Knockout stick 6 Wrinkle presser 7 Clamping punch 8 Ring member A Head B Shaft part C Processing head

Claims (8)

A first metal member and a second metal member having a through hole opened at an appropriate position are overlapped, and a concave portion having a hole diameter substantially the same as the hole diameter of the through hole is formed with the first metal member facing upward. Place the through hole and the recess in correspondence with the die provided,
By pressing the first metal member from above the through hole of the second metal member with a pressing punch having a diameter larger than the diameter of the through hole, the front portion of the first metal member is recessed. The protrusion protruding from the second metal member, formed by a part of the first metal member that has been flowed by the pressing of the punch and penetrated the through hole of the second metal member , The metal that joins the first metal member and the second metal member by being caulked around the through hole in the main surface of the second metal member on the side not in contact with the first metal member Member joining method.   The method for joining metal members according to claim 1, wherein the strength of the first metal member is lower than the strength of the second metal member.   The metal member joining method according to claim 1 or 2, wherein the first metal member has a thickness greater than that of the second metal member.   The metal member joining method according to claim 1, wherein a ring member is fitted to an inner periphery of a through hole provided in the second metal member.   The metal member joining method according to claim 4, wherein the ring member is higher in strength than the first metal member. The method for joining metal members according to claim 1, wherein the first metal member is low carbon steel, and the second metal member is high carbon steel or special steel. A joined body in which a first metal member and a second metal member having a through hole opened at an appropriate position are joined,
In the front portion of the side of the first metal member that is not in contact with the second metal member , a concave portion having a hole diameter larger than the through hole,
The protruding portion that protrudes from the second metal member and is formed by a part of the first metal member that penetrates the through hole of the second metal member is on the side that is not in contact with the first metal member. (2) A joined body of metal members that is caulked around the through hole in the main surface of the metal member. The joined body of metal members according to claim 7, wherein the first metal member is low carbon steel, and the second metal member is high carbon steel or special steel.

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