JP5901510B2 - Metal material joining mold and mold release device - Google Patents

Description

  The present invention relates to a metal material joining mold that applies pressure to a material to be joined in which a plurality of metal materials are superimposed to join each metal material, and a mold release device used for the metal material joining die.

  As a method for joining a plurality of metal plates, mechanical clinching joining such as a TOX joining method (TOX is a registered trademark) is known. As shown in FIG. 11, mechanical clinching joining is performed by overlapping a plurality of metal plates P11 and P12 and arranging them between the die 101 and the punch 102, and relatively driving the die 101 and the punch 102. In this method, the metal plates P11 and P12 are joined together by pressing in the direction in which the metal plates P11 and P12 are sandwiched. This mechanical clinching joining is superior in that a high shear strength and peel strength can be obtained as compared with a conventional joining method using cold pressure welding (see Patent Document 1 and Patent Document 2).

JP-A-10-52766 JP-A-10-99926

  However, when a plurality of metal plates are bonded by mechanical clinching bonding, the bonded portion may not easily come off the die. Specifically, as shown in FIG. 11, the pressed portions of the metal plates P11 and P12 are pressed by mechanical clinching bonding and are bitten into the cavity 103 of the die 101 while being plastically deformed. An extended stretched portion 107 (see FIG. 11C) is generated on the metal plate P11 on the die 101 side. The extending portion 107 is extended most in the die groove 104 of the die 101. Since the metal plate P11 before pressing is entirely covered with an oxide film, the metal atoms on the surface are in a stable state. However, since the extended portion 107 is not covered with the oxide film, the metal atoms on the surface thereof are in an active state. For this reason, the extended portion 107 and the die 101 are cold-welded, and the extended portion 107 is difficult to be detached from the die 101. Of course, if lubricating oil or the like is applied to the metal plates P11 and P12 and the die 101 in order to promote mold release, it can be easily removed. However, when the metal plates P11 and P12 to be joined are used for an application in which mixing of oil is not permitted, for example, for the purpose of stirring the toner in the image forming apparatus or the stirring or cutting of the food in the food processing apparatus, the lubricating oil Etc. cannot be used. If the metal parts P11 and P12 are forcibly removed from the die 101 in a state where the extended portion 107 and the die 101 are cold-welded, the joint portion may be deformed, cracks or cracks may occur, and in some cases May peel off. Similarly, when the metal plate P12 is pressed by the punch 102, an extended portion 108 corresponding to the outer peripheral edge of the tip of the punch 102 is generated in the metal plate P12, and the extended portion 108 and the punch 102 are cold-welded. As a result, the extension 108 becomes difficult to come off the punch 102.

  Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to provide a metal material joining mold and a mold release device capable of easily detaching a joint portion of a plurality of metal materials from a mold. Is to provide.

  The present invention provides a die having a cavity into which a material to be joined in which a plurality of metal materials are superimposed and a press-fit portion of the material to be joined by pressurizing the material to be joined interposed between the dies. A punch that is plastically deformed and press-fitted into the cavity, and a mold release mechanism that, after press-fitting with the punch, applies a force to the pressed part and separates the pressed part from at least one of the die and the punch, It is comprised as a metal material joining metal mold | die provided with.

  Further, the present invention provides a die having a cavity into which a material to be joined on which a plurality of metal materials are superimposed is press-fitted, and a die formed in the die and penetrating in the same direction as the press-fitting direction of the material to be joined. A first position that is provided in the first through-hole and that protrudes from the first through-hole to the cavity; and a second position closer to the first through-hole than the first position in the cavity. A metal material joining mold comprising: a first slide member that is slidably supported between positions; and a first elastic member that biases the first slide member toward the first position. .

  According to another aspect of the present invention, there is provided a punch that contacts and pressurizes a pressure-receiving portion of a material to be joined in which a plurality of metal materials are superimposed, and a punch that is formed on the punch and contacts the pressure-receiving portion. A second through-hole penetrating in the same direction as the pressurizing direction; a third position provided in the second through-hole, the tip of which protrudes from the contact portion; and a fourth position of immersing in the second through-hole. And a second elastic member that is slidably supported between the second slide member and a second elastic member that biases the second slide member toward the third position.

  Further, the present invention provides a die having a cavity into which a material to be joined on which a plurality of metal materials are superimposed is press-fitted, and a die formed in the die and penetrating in the same direction as the press-fitting direction of the material to be joined. A first position that is provided in the first through-hole and that protrudes from the first through-hole to the cavity; and a second position closer to the first through-hole than the first position in the cavity. The mold release device includes a first slide member that is slidably supported between positions, and a first elastic member that biases the first slide member toward the first position.

  According to the present invention, it is possible to easily detach the bonded portion of a material to be bonded made of a plurality of metal materials from a die or a punch.

It is a perspective view which shows schematic structure of the metal mold | die for joining which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the cross-section of the metal mold | die for joining. It is a fragmentary sectional view which shows the cross-section of the clamp pin with which the metal mold | die for joining is equipped. It is a fragmentary sectional view which shows the cross-section of the upper part of the upper die holder with which the metal mold | die for joining is equipped. It is a fragmentary sectional view which shows the cross-section of die | dye with which the metal mold | die for joining is equipped. It is a fragmentary sectional view for demonstrating the joining procedure and operation | movement of a metal plate by a metal mold | die for joining. It is a fragmentary sectional view for demonstrating the joining procedure and operation | movement of a metal plate by a metal mold | die for joining. It is the elements on larger scale which show the periphery structure of the die | dye and punch which a joining metal mold | die is equipped with. It is a fragmentary sectional view which shows schematic structure of the metal mold | die for joining which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows schematic structure of the metal mold | die for joining which concerns on 3rd Embodiment of this invention. It is a schematic cross section which shows the process of the conventional mechanical clinching joining.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. Each embodiment described below is only an example embodying the present invention, and the embodiment of the present invention can be appropriately changed without departing from the gist of the present invention.

  FIG. 1 is a perspective view showing a configuration of a bonding mold 10 according to the first embodiment of the present invention, and FIG. 1 (A) shows an external perspective view obliquely from above. FIG. 1B shows the configuration of the die 21 and the punch 22 provided in the joining mold 10, and FIG. 1C shows the separation provided in the joining mold 10. The configuration of the mold mechanism 23 is shown. In the following description, the vertical direction 6 is defined with reference to the state where the bonding mold 10 is installed (the state shown in FIG. 1), and the front-rear direction 7 is defined with the front side (front side) as the front. The left and right direction 8 is defined when the bonding mold 10 is viewed from the front side (front side).

  The bonding mold 10 is an example of a metal material bonding mold according to the present invention, and is used when bonding each metal plate by applying pressure to a material to be bonded 40 in which a plurality of metal materials are superimposed. It is a mold. The bonding mold 10 is used by being mounted on a pressing device (not shown). As shown in FIG. 1, the joining mold 10 mainly includes a movable mold 14 that is driven in the vertical direction 6 and a fixed mold 16 that is fixed to a pressing device (not shown). In the bonding mold 10, the movable mold 14 is disposed on the upper side, and the fixed mold 16 is disposed on the lower side of the movable mold 14. The movable die 14 is provided with a die 21 (an example of a die according to the present invention) and a release mechanism 23 (an example of a release mechanism according to the present invention). The fixed die 16 is provided with a punch 22 (an example of a punch according to the present invention). The material to be joined 40 is an upper plate 41 and a lower plate 42, which are metal metallic materials, overlapped in the vertical direction, and this material to be joined 40 is joined before joining by the joining mold 10. It is set on the upper surface of the fixed mold 16.

  As shown in FIG. 2, the fixed die 16 has a punch holder 26 and two punches 22. The punch holder 26 mounts the material to be joined 40 and holds the two punches 22 and is made of, for example, carbon steel such as S45C or S50C. The punch holder 26 is a rectangular parallelepiped metal block whose upper surface is formed on a horizontal flat surface. The material to be joined 40 is placed horizontally on the upper surface of the punch holder 26. The punch holder 26 is formed with two cylindrical guide holes 27 extending in the up-down direction 6 with the upper surface opened. The punch 22 is supported in the guide hole 27 so as to be slidable in the vertical direction 6.

  The punch 22 pressurizes the material to be bonded 40 placed on the upper surface of the punch holder 26, and plastically deforms the pressure-receiving portion to which pressure is applied in the material to be bonded 40, so that the cavity 44 of the die 21 (see FIG. 5). The pressed portion is press-fitted into the. Since this punch 22 requires sufficient strength at the time of joining, a metal material having relatively high hardness, for example, SKD11 (alloy tool steel), SKH51 (high speed tool steel), SKH40 (powder high speed tool). Steel). The punch 22 is formed in a columnar shape corresponding to the guide hole 27 and is inserted into the guide hole 27 by fitting so as to be slidable on the inner surface of the guide hole 27. A protrusion 28 protruding upward is provided on the upper portion of the punch 22, and the protrusion 28 is inserted into the cavity 44 of the die 21 during bonding. In the present embodiment, when the punch 22 is moved upward by an actuator (not shown), the protrusion 28 comes into contact with the lower surface of the material to be joined 40, and the pressed portion of the material to be joined 40 is plastically deformed upward. The

  As shown in FIG. 2, the movable mold 14 is disposed above the fixed mold 16. The movable mold 14 is used by being connected to the fixed mold 16. The movable mold 14 mainly includes an upper die holder 31, a lower die holder 32, a clamp plate 33, a backing plate 34, a mold head 35, three clamp pins 36, two dies 21, and two And a release mechanism 23. Among these, the upper die holder 31, the lower die holder 32, the clamp plate 33, the mold head 35, and the clamp pin 36 are formed of carbon steel such as S45C and S50C, like the punch holder 26. On the other hand, the backing plate 34, the die 21, and the plunger 62 (an example of the first slide member of the present invention) of the release mechanism 23 require a sufficient strength at the time of joining. For example, it is formed of SKD11 (alloy tool steel), SKH51 (high speed tool steel), SKH40 (powder high speed tool steel) or the like.

  The upper die holder 31 and the lower die holder 32 hold the two dies 21 and are rectangular parallelepiped metal blocks whose upper and lower surfaces are formed on a horizontal flat surface. The lower die holder 32 constitutes the lowermost part of the movable die 14 and is provided so that the lower surface thereof faces the upper surface of the punch holder 26. The upper die holder 31 is provided with a predetermined gap 48 between the upper die holder 31 and the clamp plate 33 provided on the upper side of the lower die holder 32.

  The lower die holder 32 is formed with two through holes 46 penetrating in the vertical direction 6. The through hole 46 is for supporting the die 21 in the lower die holder 32 so as to be slidable in the vertical direction 6. The central axes of these through holes 46 coincide with the central axis of the guide hole 27 of the punch holder 26. That is, the through hole 46 and the guide hole 27 are formed on the same central axis in the vertical direction 6. A cylindrical portion 71 (see FIG. 5) of the die 21 is supported in the through hole 46 so as to be slidable in the vertical direction 6.

  Three clamp holes 51 are formed in the lower die holder 32 adjacent to the through holes 46. The clamp hole 51 penetrates the lower die holder 32 in the vertical direction 6. A clamp pin 36 and a coil spring 52 are provided in the clamp hole 51. The clamp pin 36 has a function of pressing the material to be bonded 40 before bonding by the bonding mold 10 and a function of pulling the material 40 to be bonded away from the lower surface of the lower die holder 32 after bonding.

As shown in FIG. 3, the clamp hole 51 has a lower-side lower hole 51B and an upper-side hole 51A having a diameter larger than that of the lower hole 51B. A pin portion 36A of the clamp pin 36 is inserted into the lower hole 51B, and a pin head 36B constituting the upper end portion of the clamp pin 36 is inserted into the upper hole 51A. In a state where the clamp pin 36 is inserted into the clamp hole 51, the pin head 36B is hooked on a seat portion 51C formed at the boundary between the lower hole 51B and the upper hole 51A. With the pin head 36 </ b> B hooked on the seat 51 </ b> C, the tip 36 </ b> C of the clamp pin 36 projects downward from the lower surface of the lower die holder 32. In the upper hole 51A of the clamp hole 51, a coil spring 52 is provided above the pin head 36B. The coil spring 52 is provided in the upper hole 51A in a compressed state, thereby, clamp the pin 36, the biasing force of the coil spring 52 downward is applied. The clamp plate 33 is mounted on the upper surface of the lower die holder 32, whereby the upper opening of the clamp hole 51 is closed and the coil spring 52 is held in the compressed state by the upper hole 51A.

  As shown in FIG. 2, the clamp plate 33 is a plate-like member for closing the upper opening of the clamp hole 51, and is fixed to the upper surface of the lower die holder 32. The clamp plate 33 is formed with two through holes 33 </ b> A having a central axis in common with the through hole 46. With the clamp plate 33 fixed to the lower die holder 32, the cylindrical portion 71 (see FIG. 5) of the die 21 is inserted through the through hole 33A.

The upper die holder 31 is formed with two fixing holes 47 penetrating in the vertical direction 6. The fixing hole 47 is for fixing the die 21 to the upper die holder 31. The central axes of the fixing holes 47 coincide with the central axes of the through hole 46 and the guide hole 27, respectively. That is, all of the fixing hole 47, the through hole 46, and the guide hole 27 are formed on the same central axis. The fixing hole 47 is for fixing the die 21 to the upper die holder 31. As will be described later, the die 21 is fixed to the upper die holder 31 by fixing the backing plate 34 to the upper surface of the upper die holder 31 after the die 21 is mounted in the fixing hole 47.

  Three spring holes 54 are formed in the upper die holder 31 adjacent to the fixing holes 47. The spring hole 54 penetrates the upper die holder 31 in the vertical direction 6. A coil spring 55 is provided in the spring hole 54. A backing plate 34 is fixed to the upper surface of the upper die holder 31. Therefore, the upper opening of the spring hole 54 and the fixing hole 47 is closed by the backing plate 34. The upper end of the coil spring 55 is supported by the backing plate 34. The lower end of the coil spring 55 protrudes downward from the spring hole 54 and is supported by the upper surface of the clamp plate 33 as shown in FIG. The natural length of the coil spring 55 is longer than the dimension of the spring hole 54 in the vertical direction 6. Further, the coil spring 55 is set to a spring force capable of forming a gap 48 between the upper die holder 31 and the clamp plate 33 in a state where the load of the upper die holder 31, the backing plate 34 and the mold head 35 is received. Has been. That is, the coil spring 55 supports the upper die holder 31 so as to lift it from the lower die holder 32 and the clamp plate 33 in a state where no driving force is applied to the movable die 14. At this time, the lower end of the die 21 maintains a posture immersed in a through hole 46 described later. In the present embodiment, the spring force of the coil spring 55 is set to be larger than the spring force of the coil spring 52 in the state shown in FIG.

  As shown in FIG. 4, the fixing hole 47 has a lower hole 47B having the same diameter as the through hole 46, and an upper hole 47A having a diameter larger than that of the lower hole 47B. A cylindrical portion 71 constituting the main body portion of the die 21 is inserted into the lower hole 47B, and a die head 72 constituting the upper end portion of the die 21 is fitted into the upper hole 47A. With the die 21 mounted in the fixing hole 47, the die head 72 is hooked on a seat portion 47C formed at the boundary between the lower hole 47B and the upper hole 47A. In a state where the die head 72 is hooked on the seat 47C, the upper surface of the die 21, that is, the upper surface of the die head 72 is flush with the upper surface of the upper die holder 31. In this state, when the backing plate 34 is fixed to the upper surface of the upper die holder 31, the die 21 is fixed to the upper die holder 31.

  As shown in FIG. 4, an air hole 57 that connects the spring hole 54 and the upper hole 47 </ b> A of the fixing hole 47 is formed in the upper part of the upper die holder 31. The air hole 57 continues to the outside air through the spring hole 54 and the gap 48. Therefore, when the air pressure in the air gap 48 is in a negative pressure state lower than the atmospheric pressure, external air flows into the air gap 48 through the air holes 57.

  As shown in FIG. 2, the backing plate 34 is fixed to the upper surface of the upper die holder 31. The backing plate 34 receives an upward processing load applied to the plungers 62 of the die 21 and the release mechanism 23 during joining by the joining mold 10. In the backing plate 34, two through holes 34A (see FIG. 4) having a central axis common to the through hole 46 and the fixing hole 47 are formed. The diameter of the through hole 34 </ b> A is smaller than the diameter of the upper hole 47 </ b> A of the fixing hole 47. Therefore, the die head 72 (see FIG. 4) of the die 21 mounted in the upper hole 47A does not jump upward through the through hole 34A, and the upward movement of the die 21 is restricted by the backing plate 34.

  A mold head 35 is fixed on the upper side of the backing plate 34. The mold head 35 constitutes the uppermost part in the movable mold 14. The die head 35 is a portion to which a driving force in the vertical direction 6 is applied from a driving source provided in a pressing device (not shown) in the joining process by the joining die 10, and the die is applied by applying this driving force. The movable mold 14 including the head 35 is moved in the vertical direction 6. Further, the mold head 35 is formed with two through holes 61 having a central axis in common with the through hole 34A. The through hole 61 has a lower hole 61B having the same diameter as the through hole 34A and an upper hole 61A having a diameter larger than that of the lower hole 61B. A push rod 63 (see FIG. 1), which will be described later, constituting the release mechanism 23 is inserted into the lower hole 61B. In addition, a coil spring 65 and a fixing screw 67, which will be described later, constituting the release mechanism 23 are attached to the upper hole 61A.

  Although not shown in any of the drawings, the fixed die 16 is provided with a guide post, and the movable die 14 is provided with a guide bush. The guide post and the guide bush are connected to the fixed mold 16 and the movable mold 14 so as to support the movable mold 14 so as to be movable in the vertical direction 6 with respect to the fixed mold 16. The bush is slidably fitted.

  As shown in FIGS. 4 and 5, the die 21 has a cylindrical portion 71 and a die head 72 provided on the upper side of the cylindrical portion 71. In the center of the die 21, a long slide hole 76 (an example of the first through hole of the present invention) that penetrates the cylindrical portion 71 and the die head 72 in the vertical direction 6 is formed. The slide hole 76 penetrates from the cavity 44 formed at the lower end portion of the die 21 in the vertical direction 6 which is the same as the pressurizing direction by the punch 22. In other words, a long slide hole 76 penetrating in the vertical direction 6 is formed at the center of the die 21. The cylindrical portion 71 is slidably supported by the through hole 46 and the through hole 33 </ b> A, and is inserted into the lower hole 47 </ b> B of the fixing hole 47. The die head 72 is formed larger than the diameter of the tubular portion 71 and is provided at the upper end of the tubular portion 71.

As shown in FIG. 4, an accommodation chamber 78 is formed at the upper end of the slide hole 76 to accommodate the plunger head 68 that constitutes the upper end portion of the plunger 62 of the release mechanism 23. Accommodating yield vessel chamber 78 is a space of larger formed cylindrical than the outer diameter of the plunger head 68, in a state in which the plunger head 68 is accommodated in the accommodation chamber 78, the outer peripheral surface of the plunger head 68 and A gap 79 is formed between the inner surface of the chamber 78. An air hole 74 that is continuous with the air hole 57 is formed in the side wall of the die head 72. The air hole 74 communicates with the accommodation chamber 78 and the gap 79, so that external air can flow into the accommodation chamber 78.

  As shown in FIG. 5B, the die 21 has a cavity 44 into which the material to be joined 40 is press-fitted in the joining process by the joining mold 10. The cavity 44 is formed at the lower end of the slide hole 76. More specifically, a cylindrical recess 80 having a diameter larger than that of the slide hole 76 is formed at the lower end of the slide hole 76, and the cavity 44 has a recess 80 and a second position described later (FIG. 5B). This is a space defined by the lower end 62A of the plunger 62 disposed in the reference).

  The mold release mechanism 23 applies a force to the pressure-receiving portion of the material to be bonded 40 after the material to be bonded 40 is bonded, thereby separating the pressure-receiving portion from the die 21. As shown in FIG. 1C, the release mechanism 23 includes a plunger 62, a push rod 63, a coil spring 65 (an example of the first elastic member of the present invention), and a fixing screw 67. Yes. In the present embodiment, the mold release device 23 of the present invention is realized by the mold release mechanism 23, the slide hole 76 in which the plunger 62 is slidably supported, and the die 21 in which the slide hole 76 is formed.

  In the joining process by the joining mold 10, the plunger 62 comes into contact with the joined material 40 after joining and presses the joined material 40 downward. As shown in FIG. 5, the plunger 62 is provided in the slide hole 76 so as to be slidable in the vertical direction 6. The plunger head 68 is provided. In the slide hole 76, the plunger 62 has a first position where the lower end 62A of the plunger 62 protrudes from the lower opening of the slide hole 76 toward the cavity 44 (the position shown in FIG. 5A). It is slidably supported between the first position and the second position (position shown in FIG. 5B) closer to the slide hole 76. In the present embodiment, the cavity 44 is formed at the lower end of the die 21 when the plunger 62 is disposed at the second position. Further, a stepped portion 86 with corners notched is formed on the side surface of the outer peripheral edge of the lower end portion 62 </ b> A of the plunger 62, that is, on the outer peripheral surface of the tip of the plunger 62. Therefore, when the plunger 62 is disposed at the second position, the die groove 88 in the cavity 44 is formed by the plunger 62 disposed at the second position and the inner surface of the recess 80.

  An air hole 85 is formed in the plunger 62. The air hole 85 extends from the discharge port 83 provided in the lower end portion 62 </ b> A of the plunger 62 to the side surface of the plunger head 68 through the center inside the plunger main body 69. Thereby, an air path from the air hole 85 to the air gap 79, the air hole 74, the air hole 57, the spring hole 54, and the air gap 48 is formed. This air path is an example of the first air path of the present invention. In this embodiment, when the plunger 62 is arrange | positioned in the said 1st position (refer FIG. 5 (A)), between the space | gap 79 and the air hole 74 is interrupted | blocked, and the said air path is obstruct | occluded. Moreover, when the plunger 62 is arrange | positioned in the said 2nd position (refer FIG. 5 (B)), between the space | gap 79 and the air hole 74 is connected, and the said air path is connected outside. Specifically, a seal member 90 such as an O-ring is provided on the side surface of the plunger head 68 above the suction port 84 of the air hole 85. When the plunger 62 is disposed at the first position, the seal member 90 seals the gap 79 at a position below the air hole 74 (see FIG. 5A). Thereby, the air path is closed. Further, when the plunger 62 is disposed at the second position, the seal member 90 moves to a position above the air hole 74 (see FIG. 5B). Thereby, the air path communicates with the outside.

  As shown in FIG. 2, the push rod 63 is provided in the lower hole 61 </ b> B of the through hole 61 of the mold head 35. A rod portion 63A (see FIG. 5) of the push rod 63 is inserted into the lower hole 61B, and a rod head 63B (see FIG. 5) constituting the upper end portion of the push rod 63 is inserted into the upper hole 61A. In a state where the push rod 63 is inserted into the through hole 61, the rod head 63B is hooked on a seat portion formed at the boundary between the lower hole 61B and the upper hole 61A. In a state where the rod head 63B is hooked on the seat portion, the lower end portion of the rod portion 63A protrudes into the storage chamber 78. In the upper hole 61A of the through hole 61, a coil spring 65 is provided above the rod head 63B. The coil spring 65 is provided in the upper hole 61A in a compressed state, whereby the push rod 63 is given a downward biasing force from the coil spring 65. A fixing screw 67 is screwed on the upper side of the through hole 61, thereby closing the opening on the upper side of the through hole 61.

  The push rod 63 urged downward by the coil spring 65 presses the plunger head 68 downward in the accommodation chamber 78. That is, the plunger 62 is biased toward the first position by the coil spring 65. Thereby, the plunger 62 is arrange | positioned in the said 1st position shown by FIG. 5 (A) in the state in which the other force is not applied.

  Hereinafter, the operation of the bonding mold 10 in the bonding process will be described with reference to FIGS. Here, FIG. 6A shows a state in which the material to be joined 40 is set on the joining mold 10, and FIG. 6B shows that a downward driving force is applied to the movable die 14. The state after the first step is shown, and FIG. 6C shows the state after the second step in which a lower driving force is further applied to the movable mold 14. FIG. 7A shows a state after the third step in which an upward driving force is applied to the movable die 14, and FIG. 7B shows further upward driving of the movable die 14. A state after the fourth step in which force is applied is shown, and FIG. 7C shows a state in which the joining by the joining mold 10 is completed. FIG. 8A shows a partially enlarged view of the cavity 44 in FIG. 6C, and FIG. 8B omits the material to be joined 40 in FIG. 8A. A partially enlarged view is shown. 6 and 7, only a part of the configuration of the bonding mold 10 is shown for convenience of explanation.

As shown in FIG. 6A, before joining is performed, the joining mold 10 is in a state where a gap is formed between the fixed mold 16 and the movable mold 14, and the coil spring 55 is used. The lower end of the die 21 is held in a state of being immersed in the through hole 46. At this time, since the plunger 62 is disposed at the first position (see FIG. 5A), the air path is closed. In this state, the bonded material 40 in which the upper plate 41 and the lower plate 42 are overlapped is placed on the upper surface of the fixed mold 16.

Subsequently, in the first step, when the driving force downward the movable mold 14 is applied, and the movable mold 14 is lowered, clamp pin 36 abuts against the upper plate 41. Then, further when the movable mold 14 is lowered, the coil spring 52 is compressed, together with the clamp pin 36 is retracted into the clamp hole 51, the lower surface of the lower die holder 32 abuts against the upper plate 41 (see FIG. 6 (B) ). At this time, since the spring force of the coil spring 55 is set larger than the spring force of the coil spring 52, the coil spring 55 is not compressed. Therefore, the die 21 remains in a state where it is immersed in the through hole 46.

  Subsequently, when a downward driving force is further applied to the movable die 14 in the second step, the coil spring 55 is gradually compressed in the next third step, and the upper die holder 31 starts to descend. Thereby, the die 21 fixed to the upper die holder 31 also moves downward, and the lower end of the die 21 approaches the upper plate 41. Simultaneously with this operation, an upward driving force is applied to the punch 22 and the punch 22 starts to rise. When a driving force is further applied to the movable die 14, the lower end of the die 21 comes into contact with the upper plate 41 and presses the upper plate 41 downward as shown in FIG. 6C. On the other hand, the protrusion 28 of the punch 22 contacts the lower plate 42. At this time, by being strongly pressed by the protrusions 28, the pressed portion of the material 40 to be in contact with the protrusions 28 is plastically deformed and is pressed into the cavity 44 while pushing the plunger 62 upward. . At this time, the plunger 62 is moved from the first position (see FIG. 5A) to the second position (see FIG. 5B). As a result, the air path is communicated and the outside air can flow into the discharge port 83 of the air hole 85.

  Subsequently, as shown in FIG. 7A, in the third step, an upper driving force is applied to the movable mold 14, and simultaneously, a lower driving force is applied to the punch 22. When an upward driving force is applied to the movable mold 14, first, the coil spring 55 starts to expand. As a result, the upper die holder 31 starts to rise, and at the same time, the cylindrical portion 71 of the die 21 moves upward. At this time, since the plunger 62 is pressed downward by the push rod 63, the plunger 62 does not rise and its lower end 62A remains in contact with the upper plate 41. In other words, the pressed portion of the material to be bonded 40 is pressed relatively downward by the plunger 62. Thereby, the cylindrical part 71 and the upper plate 41 of the die 21 can be easily separated.

  Further, when the cylindrical portion 71 is moved upward, the space formed between the lower end portion of the die 21 and the upper plate 41 is in a vacuum state or a negative pressure state in which the atmospheric pressure is lower than the atmospheric pressure. At the time when the cylindrical portion 71 starts moving upward, the air path is in communication with the outside air. Therefore, when the space is in a vacuum state or a negative pressure state, external air passes through the air path. Then, the ink is discharged from the discharge port 83 into the cavity 44. By this discharged air, the pressed part of the material to be joined 40 is pressed away from the lower end part 62A of the plunger 62. Thereby, the lower end portion 62A of the plunger 62 and the pressed portion of the bonded material 40 can be easily separated. In addition, when air is discharged to the pressure-receiving portion of the material to be bonded 40, an extended portion of the metal in the pressure-receiving portion touches the air to form an oxide film. As a result, cold bonding between the cavity 44 and the pressed part is reduced.

In the state where the lower end portion 62A of the plunger 62 and the pressed portion of the material to be joined 40 are in contact with each other, the discharge port 83 is closed, so that it is difficult to discharge air even if the air path is in communication. Therefore, as shown in FIG. 8, by forming a single or multiple grooves 92 at the lower end 62A of the plunger 62, it is possible to always send air into the cavity 44 when the air path communicates. It becomes. As a result, air always exists in the cavity 44, and an oxide film can be formed on the extended portion of the metal in the pressed portion at an earlier stage.

  Subsequently, as shown in FIG. 7B, in the fourth step, when an upper driving force is further applied to the movable mold 14, the die 21 comes into contact with the plunger head 68, and the plunger together with the die 21 is moved to the plunger. 62 moves upward. At this time, the lower end portion 62 </ b> A of the plunger 62 is completely separated from the pressed portion of the bonded material 40. When the movable die 14 is further moved upward, the lower die holder 32 is lifted and the clamp pin 36 is separated from the upper plate 41 as shown in FIG. Thereby, the joining of the materials to be joined by the joining mold 10 is completed.

Thus, the junction die 10 according to the first embodiment is configured, when the die 21 is separated upward from the welded material 40, the pressure portion of the bonding material 40 by flop flanger 62 Pressed downward. Thereby, the material 40 to be joined is easily detached from the die 21. Further, since air flows into the cavity 44 from the discharge port 83 of the lower end portion 62A of the plunger 62 through the air path, the air touches the metal extension portion of the pressed portion that is in contact with the lower end portion 62A. Thus, the generation of the oxide film in the portion is promoted. As a result, cold bonding between the inner surface of the cavity 44 and the pressure-receiving portion is prevented, and the pressure-receiving portion is easily detached from the cavity 44.

  In the first embodiment described above, an example in which the upper plate 41 and the lower plate 42 made of a metal plate are joined has been described. For example, a metal component such as a metal stud is attached to the lower plate 42 of the metal plate. The present invention can also be applied when joining. In this case, a die or punch having a shape corresponding to the shape of the metal part is used.

Further, in the first embodiment described above, the configuration in which the pressed portion of the material to be bonded 40 is pressed downward by the plunger 62 is illustrated, but for example, as a second embodiment of the present invention, as shown in FIG. It is also possible to adopt a configuration in which a member similar to the plunger 62 is provided on the punch 22. As shown in FIG. 9 (A), the bonding mold 11 of the second embodiment is replaced with a punch 122 slidably supported in a guide hole 27 in place of the punch 22 in the first embodiment (the present invention). An example of a punch). The joining mold 11 includes a through hole 123 (an example of the second through hole of the present invention) formed in the center of the punch 122 and a plunger 124 ( second slide of the present invention) provided in the through hole 123. An example of a member) and a coil spring 125 (an example of the second elastic member of the present invention) that urges the plunger 124 are further provided. Note that in the second embodiment, configurations that are the same as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  The punch 122 pressurizes the material to be bonded 40 placed on the upper surface of the punch holder 26, and plastically deforms the pressure-receiving portion to which pressure is applied in the material to be bonded 40, thereby forming the pressure-receiving portion in the cavity 44 of the die 21. Press-fit. The through hole 123 penetrates from the protrusion 28 in the punch 122 in the pressurizing direction (up and down direction 6) by the punch 122. A plunger 124 is slidably supported in the through hole 123. Specifically, the plunger 124 is supported so as to be slidable between a third position where the tip of the plunger 124 protrudes upward from the protrusion 28 and a fourth position where the plunger 124 enters the through hole 123. The opening at the lower end of the through hole 123 is closed by a fixing screw 126. The coil spring 125 is provided between the plunger 124 and the fixing screw 126 in the guide hole 27, and urges the plunger 124 toward the third position. In the joining mold 11 of the second embodiment configured as described above, even if the punch 122 is moved downward after joining as shown in FIG. The pressed part of the material to be joined 40 is pressed from below to above. Thereby, the protrusion 28 of the punch 122 is easily detached from the pressed portion.

  In the above-described first embodiment, the example in which the air hole 85 is formed in the plunger 62 has been described. However, the structure having no air path including the air hole 85, that is, the plunger 62 has the structure of the material 40 to be bonded. Even in a bonding mold having only a configuration for pressing the pressed portion downward, an effect of detaching the bonded material 40 can be achieved.

  Further, in the first embodiment described above, the configuration in which the pressed portion of the material to be bonded 40 is pressed downward by the plunger 62 has been exemplified. However, for example, as shown in FIG. 10 as the third embodiment of the present invention. It is also possible to adopt a configuration having only a mechanism for allowing air to flow into the cavity 44 without providing a pressing mechanism by the plunger 62. As shown in FIG. 10, the bonding mold 12 of the third embodiment includes a die 131 having a cavity 44 formed at the lower end in place of the die 21 in the first embodiment described above. Note that the release mechanism 23 in the first embodiment described above is not provided. In the third embodiment, the same reference numerals as those in the first embodiment described above are used to omit the description thereof.

In the third embodiment, a structure in which a through hole 132 is formed in a die 131 is employed as the release mechanism of the present invention. The through hole 132 extends from the discharge port 83 of the cavity 44 through the upper end of the die 131 through the center of the die 131, further to the outside through the backing plate 3 4 and the mold head 35 in the vertical direction 6 It is installed. The through hole 132 is an air path for allowing outside air to flow into the cavity 44, and corresponds to the second air path of the present invention. Since such a through-hole 132 is provided, when the material to be joined 40 is joined, the metal extension portion of the pressure-receiving portion comes into contact with the air flowing into the cavity 44 from the air through-hole 132, and the oxide film in that portion Generation is promoted. As a result, cold bonding between the inner surface of the cavity 44 and the pressure-receiving portion is prevented, and the pressure-receiving portion is easily detached from the cavity 44.

10, 11, 12: Joining die 14: Movable die 16: Fixed die 21: Die 22: Punch 23: Release mechanism 40: Material to be joined 44: Cavity 52: Coil spring 62: Plunger 85: Air hole

Claims (3)

A die having a cavity into which a material to be joined in which a plurality of metal materials are superimposed is press-fitted,
A punch that pressurizes the material to be bonded interposed between the die and plastically deforms a pressure-receiving portion of the material to be bonded and press-fits into the cavity;
A release mechanism that applies force to the pressure-receiving portion after press-fitting with the punch and separates the pressure-receiving portion from at least one of the die and the punch , and
The release mechanism is
A first through hole formed in the die and penetrating from the cavity in the same direction as the pressing direction by the punch;
Provided in the first through hole, and slidable between a first position where the tip projects from the first through hole toward the cavity and a second position on the first through hole side than the first position. A supported first slide member;
A first elastic member for urging the first slide member toward the first position;
Extending from the discharge opening provided at the tip of the first slide member to the outside through the inside of the first slide member, and closed when the first slide member is disposed at the first position; metal material bonding die Ru comprising a first air passage communicating with the outside when the first slide member disposed in said second position. 2. The metal material joining die according to claim 1 , wherein a die groove is formed by an outer peripheral surface at a tip of the first slide member disposed at the second position and an inner surface of a cavity of the die. The release mechanism is
A second through-hole formed in the punch and penetrating from a contact portion contacting the pressure-receiving portion in the same direction as the pressing direction by the punch;
A second slide member provided in the second through hole and supported so as to be slidable between a third position where a tip protrudes from the abutting portion and a fourth position where the tip penetrates into the second through hole;
The metal material joining mold according to claim 1, further comprising: a second elastic member that biases the second slide member toward the third position.

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