TW201313360A - Pierce nut manufacturing apparatus - Google Patents

Abstract

A piercing nut manufacturing apparatus uses a nut former for forming a nut blank 11 for a high stress type piercing nut 1. The undercut screw-hole 12 is pierced and the end surface portion of pilot portion 13 radially widened, and the four diagonal corner end surfaces of nut blank 11b finished with the forming process of slanting and enlarging the peripheral side wall surface of pilot portion 13 for defining annular groove 15 are pushed out by four knockout pins 77 and then pushed in between a pair of fingers 58, 58 of a transfer mechanism located in the vicinity of end surface of a die 53.

Description

Self-piercing clamp nut manufacturing device

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a manufacturing apparatus for a self-piercing clamp nut that "inserts a nut into a metal plate and applies a swaging to the peripheral portion of the hole to be inserted and is fixed to the metal plate", in particular The improvement of the high-stress type self-piercing clamp nut manufacturing apparatus which is proposed by the inventor of the present invention, which is proposed by the Japanese Patent Publication No. Hei 8-29392 (Patent Document 1), and which has been subjected to the powerful tightening force.

The apparatus for manufacturing a self-piercing clamp nut described in Japanese Patent Publication No. Hei 8-29392 is implemented by a nut forming machine and has the significant advantage that it is used to divide an annular groove and form a relative direction. Both of the side wall surfaces are inclined with respect to the axis, and when the annular groove is formed into a mortise which is enlarged inward, the dimensional accuracy of the inner dimension and the outer dimension of the annular groove is high, and the front portion is punched. (punching) is good, and it can mass-produce "high-quality, high-stress self-piercing clamp nut that can obtain stable and strong clamping force." The above-mentioned annular groove is formed in "a nut that is set in a square shape." The central portion of the main body has a cylindrical front portion that can be driven into the metal plate as a punch, and "between the outer peripheral edge of the nut body and surround the side wall of the front guide portion".

In the case of the above-described high-stress type self-piercing nipper nut, the above-described Patent Document 1 (Japanese Patent Publication No. Hei 8-29392) is shown in Figs. Nuts for each forging step The billet is pushed out to the front of the stamper of each step, and is held by a pair of opposite fingers of a "transport mechanism reciprocating along the front side of the stamper", and moved to the stamper of the next step. In the subsequent forging process, the nut material of the "forging process of the punching and the leading portion enlargement step shown in the second drawing of the above-mentioned Patent Document 1" is transferred to the third figure. When the side wall is inclined forging, the following problems are caused.

The nut blank 11 of the "punching and leading portion enlargement step shown in Fig. 2 of the above-mentioned Patent Document 1 (Japanese Patent Publication No. Hei 8-29392)" is shown in Fig. 14 and Fig. 15 An explanatory view of a work procedure in which a pair of fingers 39 and 39 that are opposed to each other are pushed out from the stamper 31 and "the transport mechanism that reciprocates along the front surface of the stamper 31" is held. The two fingers 39, 39 are urged in a direction in which they are approached by springs not shown in the drawing, the spacing of which is slightly smaller than the opposite side dimension of the nut blank 11.

The base portion of the punch punch 33 disposed in the recess 32 of the stamper 31 is provided with an outwardly extending tapered wall 34 which is externally fitted to the end surface of the cylindrical insert 35 of the punch punch 33. There is an annular projection 36 projecting around the tapered wall 34, and the cylindrical insert 35 is held fixed to the bracket 37.

Once the nut blank 11 into which the recess 32 of the stamper 31 has been inserted is pressed by the cylindrical punch 38, the cylindrical punch 38 and the punch punch 33 will act in concert, and the punching process "not through the nut blank 11 The pre-drilled hole is pre-drilled and forged into the threaded pre-drilled hole 12, and then, in a state where the annular projection 36 of the cylindrical insert 35 has been inserted into the annular groove 15, the end face portion of the leading portion 13 is directed toward the tapered wall 34 Pushing and expanding in the radial direction, the peripheral side wall surface 16 is inclined with respect to the axis, and the cross-sectional shape of the annular groove 15 forms an inwardly expanding groove. Further, the outer edge of the end surface of the front guide portion 13 is restricted by abutting against the inner side surface of the annular projection 36 (the end edge of the circumferential side wall surface 16 is also abutted against the inner side surface of the annular projection 36), thereby preventing excessive The oblique deformation allows the outer diameter of the end face of the leading portion 13, that is, the inner dimension of the annular groove 15, to be adjusted to a correct fixed size.

Once the punching of the threaded pre-drilled hole 12 and the step of expanding the leading portion 13 are completed, as shown in Fig. 14, first, the cylindrical punch 38 will be retracted to be detached from the stamper 31, and the two fingers 39, 39 are moved to Near the front of the stamper 31. At this time, the punched scrap piece 12c punched by the punching punch 33 is stored in the cylindrical hole of the cylindrical punch 38 and then removed. Next, as shown in Fig. 15, the punch punch 33 advances to protrude from the stamper 31, and when the nut blank 11 is lifted up and pressed between the two fingers 39, 39 to form a grip, the punching is performed. The punch 33 will be retracted into the stamper 31, and the nut blank 11 held by the two fingers 39, 39 is transferred to the front of the stamper of the next step.

Further, since the outer diameter d of the front end portion 33a of the punching punch 33 is substantially the same as the diameter of the threaded pre-drilled hole 12 formed by punching the nut blank 11, the punching punch 33 is retracted into the stamper 31. At this time, the front end portion 33a interferes with the nut blank 11 to generate a stress that pulls the nut blank 11 back into the stamper 31. However, in the normal operation operation, since the spring pressure of the two fingers 39, 39 is strong, it does not affect, but in the long-time operation, the spring of the two fingers 39, 39 may be elastic. The thrust is weakened, or the punch punch 33 is uneven or notched, and the above-described situation will become a cause. When the punch punch 33 is retracted, the nut blank 11 is pulled back into the stamper 31, and the nut cannot be pulled. The blank 11 is transferred to the subsequent step to initiate operation A major accident such as a stop.

[Patent Document 1] Japan Special Fair 8-29392

The present invention has been made in an effort to solve the above problems, and an object of the present invention is to provide a manufacturing apparatus for a self-piercing clamp nut, which is configured to be used. The four ejector pins around the punching punch are arranged to replace the punching punch, and the nut blank which has completed the punching and leading portion enlargement steps is ejected and is surely pressed between the two fingers. The control will not hinder the transfer of the aforementioned nut blank.

In order to solve the above problems, the present invention is a manufacturing apparatus for a self-piercing clamp nut of a nut of a high-stress type self-piercing clamp nut which is forged by a nut forming machine, the high stress type self-piercing clamp The nut blank of the nut is formed in a central portion of the nut body having a threaded pre-drilled hole of a square shape, and has a cylindrical front portion which can be driven into a metal plate and used as a punch, and is provided along the edge. The outer peripheral edge of the nut body is formed to protrude around the side wall of the front guide portion, and an annular groove is formed between the front guide portion and the side wall, so that the peripheral side wall surface of the front guide portion for dividing the annular groove is The side wall is inclined with respect to the axis, and the annular groove is formed with a groove which is enlarged toward the inner side, and is characterized in that the following structure is formed: the punching of the thread pre-drilling has been completed by using four ejector pins End face of the aforementioned leading portion Pressing and expanding in the radial direction, the end faces of the four corners in the diagonal direction of the nut blank of the forging step in which the circumferential side wall surface of the annular groove is divided and enlarged are pushed out, and pressed Enter between a pair of fingers of the "transport mechanism located near the end face of the stamper".

According to the invention of claim 2, in the manufacturing apparatus of the present invention, the structure of the forging stamper ‧ punch which is the main step of forging the nut material by the nut forming machine is specifically limited, and the claim 2 is The manufacturing device of the perforated clamp nut is made of "having: a forged stamper for a nut blank, a punch; and a punching and leading portion for expanding a forged stamper; a punch; and a sidewall inclined forging stamper; a punch A manufacturing device for a self-piercing jaw nut of a nut forming machine, the forged stamper for a nut blank having a recess that is configured to be inserted into a stamper of a preformed blank First, the ejector pin that is advanced and retracted in the axial direction and can be pushed to the retracted position by the spring, and the first ejector pin that is externally fitted to the ejector pin and fixedly disposed on the innermost surface of the recessed portion An annular projection is provided on an end surface of the cylindrical insert, and a protrusion portion for forming a preliminary hole for thread pre-drilling is provided on a front end surface of the punch facing the stamper, and the pressing has been inserted into the recess. The aforementioned blank is held by the aforementioned punch and the aforementioned ejector pin, The preliminary hole that does not penetrate is formed, and the annular projection is pressed into the blank, and a central portion of the nut body having a rectangular outer shape including the preliminary hole is provided, and an end surface is provided to be driven into a metal plate. a cylindrical front guide portion used for the punch, and a side wall that protrudes around the outer peripheral edge of the nut body and surrounds the front guide portion, and an annular groove is formed between the front guide portion and the side wall; the punching hole And the front part expands the forging die ‧ the punch consists of: "is equipped for insertion The base of the punching punch in the recess of the stamper of the next step of the nut blank is provided with a tapered wall that expands outward and is "exposedly fitted to the second punch punch" The end surface of the cylindrical insert is provided with an annular projection that can be inserted into the annular groove, and a cylindrical punch that "inserts the concave portion of the stamper of the next step by pressing the nut blank" and the aforementioned punch a cooperative action between the punch punches, punching the preliminary holes to pre-drill the threads, and pressing and expanding the end surface portion of the front guide portion in the radial direction by the tapered wall to divide the annular groove The circumferential side wall surface of the leading portion is inclined, and the annular groove is formed with a groove that expands inward, and the outer peripheral edge of the end surface of the leading portion abuts against the inner side surface of the annular projection to form a restriction; The slanting forging stamper ‧ punch comprises: "the recessed portion of the stamp which is disposed in the next step below the aforementioned nut blank for inserting the punched hole and the front guide portion, and advancing backward in the axial direction And can be pushed by the spring to the back The ejector pin of the retracted position has a tapered wall on the innermost surface of the inner side of the recessed portion, and the side wall of the nut blank is inclined toward the axis side, and the stamper is disposed in the next step An end surface of the third cylindrical insert of the bottom of the recess is provided with an annular projection for inserting the annular groove, and the nut is pressed by a punch facing the stamper of the next step. When the concave portion of the stamper of the next step is inserted, the side wall is inclined toward the axis side by the tapered wall, and the annular groove is formed into a groove which expands inward and the front side is inclined toward the axis side. The inner edge of the end surface of the side wall is formed to be in contact with the outer surface of the annular projection, and the punching hole and the front guide portion expand the punch punch of the stamper and the second cylindrical insert. Fixed Holding the recesses of the stamper in the next step, and providing four ejector pins surrounding the punch punches, by inserting the nut of the nut into the recess of the stamper of the next step. The cylindrical punch and the punching punch cooperate with each other, and the above-mentioned four ejector pins "the punching of the thread pre-drilling and the expansion of the leading portion" The end faces of the four corners in the diagonal direction of the nut blank are ejected and pressed between a pair of fingers of the "transport mechanism located near the end face of the stamper".

The invention of claim 3 is directed to the manufacturing apparatus of the self-piercing clamp nut described in claim 2, and more specifically to the structure of the punching front guide enlarged forging stamper ‧ punch, characterized in that the punching The punch and the second cylindrical insert are fixedly held in the recess of the stamper of the next step by the bracket, and the four ejector pins are held 90 degrees around the punch punch. a phase that is attached to the bracket in a forward and backward direction in the axial direction and that can be pushed by the spring to a retracted position, and when located in the retracted position, the front end surface and the front end surface of the second cylindrical insert form the same plane, and When advancing, it abuts against the end faces of the four corners in the diagonal direction of the aforementioned nut blank, and the nut blank is ejected and pressed between the pair of fingers.

As described above, the manufacturing apparatus of the self-piercing clamp nut of the present invention is formed by: when the nut forming material is forged by the nut forming machine, the punching of the thread pre-drilled and the end portion of the front guide portion In the radial direction The pressing is expanded, and the peripheral side wall surface of the leading portion for dividing the annular groove is inclined, and the four corners of the diagonal direction of the "the aforementioned nut blank having completed the forging step" are formed by four ejector pins. The end surface is ejected and pressed into a structure between a pair of fingers of the "transport mechanism located near the end surface of the stamper", so that the nut blank can be ejected from the stamper reliably and smoothly, and Under the control of the above two fingers, there will be no doubt that "the impact on the next step will be affected (obstructed)". Therefore, it is possible to mass-produce high-quality, high-stress, four-corner self-piercing clamp nut with high dimensional accuracy and stable tightening force.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Fig. 1 is a view showing an important part of a four-stage nut forming machine for carrying out the present invention, and a stamper for forging each of the forging steps of the nut blank, that is, a preliminary forming die 51, a nut blank forging The stamper 52, the punching and leading portion enlarged forging stamper 53, and the side wall inclined forging stamper 54 are assembled into the module 50 at equal intervals and arranged side by side in the lateral direction. For the previous step of preparing the molding die 51, the technical means for cutting a material of a certain size from a coiled material and correcting the end face thereof and supplying it to the preliminary molding die 51 is a standard of the existing nut forming machine. The usual technical means are provided, as the description and drawings are omitted.

Further, a transport mechanism 55 that "traverses in the lateral direction along the front side of the module 50" is disposed. Since the conveying mechanism 55 is also a conventional technical means that is conventionally equipped in the conventional nut forming machine, detailed description is omitted. Incidentally, as shown in FIGS. 1 and 3, the three mandrels 57 extending in the vertical direction are held in the connecting plate 56 that reciprocates in the lateral direction in the vicinity of the front surface of the module 50. The gaps of the dies 51 to 54 are equal to each other, and are installed to be rotatable around the axis, and the opposite pairs of the fingers 58 and 58 are mounted in the respective spindles to be movable in the lateral direction, and The springs of the leaf springs 59, 59 are close to each other. Next, only the two fingers 58 and 58 disposed in front of the preliminary molding die 51 in Fig. 1 are formed as shown in Fig. 4 when the preformed blank 10 is moved to the front of the forging die 52. The 180 degree reversal, while the remaining two sets of fingers 58, 58 form a parallel movement in the lateral direction.

Fig. 5 is a view showing the nut blanks 11a, 11b, and 11c of the forging steps of the above-described nut forming machine, which are respectively ejected from the respective forging stampers 52, 53, 54 and transferred to the next step. status.

The nut blank forging die 52 is disposed so as to be axially oriented in the recess 61 for inserting the blank 10 (refer to FIG. 2) which has been subjected to the upsetting process by the preliminary molding die 51. The vehicle is moved forward and backward, and has an ejector pin 62 that is pushed by the spring 63 to the retracted position. The ejector pin 62 is ejected against the spring 63 by the king pin 64 disposed at the rear thereof. Further, an annular projection 66 is provided on an end surface of the first cylindrical insert 65 that is "embedded in the ejector pin 62 and fixedly disposed on the innermost inner surface of the recess 61". Further, on the front end surface of the punch 67 provided to face the forging stamper 52, a projection portion 68 for forming a preliminary hole for threading the pre-drilled hole is provided. Then, the blank 10 inserted into the concave portion 61 is pressed to be held by the punch 67 and the ejector pin 62, and the preliminary hole 12a which is not threaded through the pre-drilled hole is formed. 12b", the annular projection 66 is pressed into the blank 10, and the cylindrical leading portion 13 of "the end surface can be driven into the metal plate and used as a punch" is formed in the central portion of the nut body including the preliminary hole 12a. And molding the side wall 14 "forming the protrusion parallel to the axis", surrounding the front guide portion 13 along the outer circumference of the nut body, and forging the snail of "the annular groove 15 is formed between the front guide portion 13 and the side wall 14" Cap blank 11a (please refer to Figure 2). The nut blank 11a forged in the above manner, as shown in Fig. 5, first, after the punch 67 is separated from the forging die 52 to be retracted, the ejector pin 62 is ejected from the forging die 52. And pressing into a pair of opposing fingers 58 , 58 to form a grip (holding).

The punching front guide portion enlarges the forging stamper 53, and in the recessed portion 71 inserted into the nut blank 11a, the punching punch 72 is fixedly held by the bracket 74, and is externally fitted to the punching punch 72. The second cylindrical insert 73. A tapered wall 75 that expands outward is provided at the base of the punching punch 72, and an annular projection 76 that "inserts the annular groove 15 of the nut blank 11a" is provided on the end surface of the second cylindrical insert 73. In addition, four elongated ejector pins 77 are provided around the punch punch 72. The ejector pin 77 is disposed so as to maintain a phase of 90 degrees around the punching punch 72 (refer to FIG. 11), and is attached so as to be able to pass through the second cylindrical insert 73 and the bracket 74 to advance in the axial direction. It is retracted and can be pushed to the retracted position by the spring 78. When it is in the retracted position, the front end surface is formed to be the same plane as the end surface of the second cylindrical insert 73 or slightly lower (refer to Figures 7-10). . The four ejector pins 77 are ejected forward against the spring 78 by the king pin 79 disposed at the rear. Further, a cylindrical punch 80 facing the forging die 53 is provided. Next, once by the cylindrical punch When the nut blank 11a is pressed and inserted into the concave portion 71, as shown in Figs. 8 and 9, the preliminary hole 12a is formed by the action of the cooperation between the cylindrical punch 80 and the punching punch 72. 12b, the thread pre-drilled hole 12 is formed, and the end surface portion of the leading portion 13 is pressed and expanded in the radial direction by the tapered wall 75 of the punching punch 72, and the peripheral side wall surface of the leading portion 13 of the annular groove 15 is divided. The inclination is formed toward the axis, and the cross-sectional shape of the annular groove 15 is formed into a groove that expands inward, and the outer peripheral edge of the end surface of the leading portion 13 abuts against the inner side surface of the annular projection 76 to form a restriction, thereby preventing excessive In the oblique deformation, the outer diameter of the end surface of the leading portion 13, that is, the inner dimension of the annular groove 15 is adjusted to a correct and fixed size, and the nut blank 11b is forged. At this time, the punched scrap piece 12c punched out by the punching punch 72 is stored in the cylindrical hole of the cylindrical punch 80 and then discharged. The nut blank 11b forged in the above manner, as shown in Fig. 10, first, the cylindrical punch 80 is separated from the forging die 53 to be retracted, and a pair of fingers 58 of the conveying mechanism 55 are 58 is moved to the vicinity of the front surface of the forging stamper 53. Next, as shown in FIG. 5, the four ejector pins 77 are ejected against the spring 78 by the king pin 79, and abut against the end faces of the four corners in the diagonal direction of the nut blank 11b, and The nut blank 11b is ejected from the concave portion 71 of the forging stamper 53. Once the nut blank 11b is ejected by the four ejector pins 77 as described above, since the nut blank 11b is correctly ejected in the axial direction, interference is not formed to the punch punch 72. It is smoothly and surely ejected from the concave portion 71, and is pressed between the pair of opposing fingers 58 and 58 to form a grip.

The side wall inclined forging die 54 is configured to be inserted into the "expanded snail" The punching hole of the pre-drilled hole 12 and the recessed portion 81 of the nut blank 11b" of the front guide portion 13 are moved forward and backward in the axial direction, and have an ejector pin 82 which is "slidable to the retracted position by the spring 83". The ejector pin 82 is ejected against the spring 83 by the king pin 84 disposed at the rear thereof. Further, the innermost surface of the inner side of the concave portion 81 is provided with a tapered wall 85 that "promotes the side wall 14 of the nut blank 11b to be inclined toward the axial side". In addition, the end surface of the third cylindrical insert 86 that is externally fitted to the ejector pin 82 and fixed to the innermost surface of the inner side of the recessed portion 81 is provided with "a certain interval from the tapered wall 85." And inserting the annular protrusion 87 of the annular groove 15" of the nut blank 11b. Further, a punch 88 facing the forging stamper 54 is provided. Next, once the nut blank 11b inserted into the concave portion 81 of the forging stamper 54 is pressed by the punch 88 (refer to Figs. 8 to 9), as shown in Fig. 9, in the third cylindrical insert 86 In a state where the annular projection 87 has been inserted into the annular groove 15, the tapered wall 85 urges the side wall 14 to be inclined toward the axial side, and the inner side wall surface 17 for dividing the annular groove 15 is inclined with respect to the axis, so that the annular groove 15 is formed. The cross-sectional shape forms a groove that expands toward the inside, and the inner end edge of the inclined side wall 14 abuts against the outer side surface of the annular protrusion 87, and the annular groove 15 is prevented by preventing excessive oblique deformation. The outer dimensions are adjusted to the correct fixed size. The nut blank 11c forged by the side wall inclined forging die 54 described above is formed as shown in Fig. 10 after the punch 88 is separated from the forging die 54 as shown in Fig. 10, as shown in Fig. 5. The ejector pin 82 is ejected from the concave portion 81 of the forging stamper 54 and then freely dropped, and is transported to a tapping step which is not shown in the drawing.

Figure 13 shows the nut that is forged in the above manner. The thread pre-drilled hole 12 of the blank 11c is a high-stress type four-corner self-piercing clamp nut 1 which is completed after the female thread 2 is machined.

1‧‧‧ four-corner self-piercing clamp nut

2‧‧‧Threaded holes

10‧‧‧Bullet

11‧‧‧ nut blank

11a, 11b, 11c‧‧‧ nut blanks

12‧‧‧Threaded pre-drilling

13‧‧‧Preceding Department

14‧‧‧ side wall

15‧‧‧ annular groove

50‧‧‧ module

51‧‧‧Preparation molding

52‧‧‧ Nut blank forging stamper

53‧‧‧Pushing and leading part expansion stamper

54‧‧‧ Sidewall inclined forging stamper

55‧‧‧Transportation agencies

58, 58‧‧‧ a pair of fingers

59, 59‧‧‧ leaf spring

61‧‧‧ recess (forging die 52)

62‧‧‧Top sales

65‧‧‧1st cylindrical insert

66‧‧‧ annular protrusion

67‧‧‧ Punch

71‧‧‧ recess (forging die 53)

72‧‧‧punch punch

73‧‧‧2nd cylindrical insert

74‧‧‧ bracket

75‧‧‧Conical wall

76‧‧‧ annular protrusion

77‧‧‧Top sales

80‧‧‧Cylindrical punch

81‧‧‧ recess (forging die 54)

82‧‧‧Top sales

85‧‧‧Conical wall (recess 81)

86‧‧‧3rd cylindrical insert

87‧‧‧ annular protrusion

88‧‧‧punces

Fig. 1 is a front view showing an important part of a nut forming machine for carrying out the present invention.

Fig. 2 is an explanatory view showing a flow of a processing procedure of a nut blank which is forged by the above-described nut forming machine.

Fig. 3 is a plan view showing the outline of a conveying mechanism for sequentially transferring the nut blank processed by each of the forging steps of the above-described nut forming machine to the next step.

Fig. 4 is a front elevational view showing the state in which the above-described conveying mechanism is moved from the position shown in Fig. 1.

Fig. 5 is a transverse sectional view showing an important portion of the forged stamper ‧ punch in a state in which the forging die is ejected from the forging die after completion of each forging step of the nut blank forging by the above-described nut forming machine.

Fig. 6 is a transverse sectional view showing an important portion of the forged stamper ‧ punch when the nut stock which has completed the main forging step of the above-mentioned nut forming machine is transferred to the next step.

Fig. 7 is a view showing a nut blank which has completed the main forging step of the above-mentioned nut forming machine, and is transferred to the state in front of the forging stamper of the next step, and the important portion of the forged stamper ‧ punch is laterally cut Top view.

Figure 8: shows the forging pressure of the nut blank that has been completed in the main forging step of the above-mentioned nut forming machine, which is transferred to the next step. In the middle of the die and the forging by the punch, the forged stamper ‧ the important part of the punch is cut transversely from the top view.

Fig. 9 is a view showing a nut blank which has completed the main forging step of the above-mentioned nut forming machine, and a forging die in a state in which the forging die and the punch which have been subjected to the next step have been completed, respectively. ‧The important part of the punch is cut transversely from the top view.

Fig. 10 is a view showing a state in which the forging die and the punch subjected to the next step shown in Fig. 9 have been forged, and the punches of the forging steps are separated from the forging die to form a backward movement state. The forged stamper ‧ the important part of the punch is cut transversely from the top view.

Fig. 11 is an enlarged front elevational view showing an important part of the punching of the nut forming machine and the enlarged forging stamper of the front guide portion.

Fig. 12 is a view showing the use of four ejector pins to enlarge the punching and boring of the punching and leading portions of the above-mentioned nut forming machine, and to complete the punching of the thread pre-drilling and the expansion of the front guide portion. An explanatory diagram of the state in which the billet is ejected.

Fig. 13 is a perspective view showing a four-corner self-piercing clincher nut which is completed after tapping the nut blank manufactured by the apparatus of the present invention.

Fig. 14 is an explanatory view showing the preparation of the nut blank of the punching and leading portion enlargement step shown in Fig. 2 of the Japanese Patent Publication No. Hei 8-29392.

Fig. 15 is an explanatory view showing a state in which the nut blank shown in Fig. 14 is ejected from the forging die and held by a pair of fingers facing each other by the conveying mechanism.

11a, 11b, 11c‧‧‧ nut blanks

12‧‧‧Threaded pre-drilling

12a, 12b‧‧‧ preparation holes

12c‧‧‧Crushed scrap

13‧‧‧Preceding Department

14‧‧‧ side wall

15‧‧‧ annular groove

50‧‧‧ module

52‧‧‧ Nut blank forging stamper

53‧‧‧Pushing and leading part expansion stamper

54‧‧‧ Sidewall inclined forging stamper

58‧‧‧One pair of fingers

61‧‧‧ recess

62‧‧‧Top sales

63‧‧‧ Spring

64‧‧‧Senior sales

65‧‧‧1st cylindrical insert

66‧‧‧ annular protrusion

67‧‧‧ Punch

68‧‧‧Protruding

71‧‧‧ recess

72‧‧‧punch punch

73‧‧‧2nd cylindrical insert

74‧‧‧ bracket

75‧‧‧Conical wall

76‧‧‧ annular protrusion

77‧‧‧Top sales

78‧‧‧ Spring

79‧‧‧Sales

80‧‧‧Cylindrical punch

81‧‧‧ recess

82‧‧‧Top sales

83‧‧‧ Spring

84‧‧‧Senior sales

85‧‧‧Conical wall

86‧‧‧3rd cylindrical insert

87‧‧‧ annular protrusion

88‧‧‧A pair of fingers

Claims (3)

Self-piercing clamp nut manufacturing device, self-piercing clamp nut manufacturing device for forging high-stress self-piercing clamp nut (1) nut blank (11) by using a nut forming machine The nut blank (11) of the high-stress self-piercing clamp nut (1) is provided with a front end portion of the nut body of the four-corner nut body having a threaded pre-drilled hole (12). a cylindrical front guide portion (13) for use as a punch in a metal plate, and a side wall (14) that protrudes along the outer peripheral edge of the nut body to surround the front guide portion, and at the front guide portion (13) Forming an annular groove (15) between the side wall (14), and the circumferential side wall surface of the front guide portion (13) for dividing the annular groove (15) and the side wall (14) are inclined with respect to the axis, and The annular groove (15) is formed with a groove extending inwardly, and is characterized in that a structure is formed in which the punching of the thread pre-drilled hole (12) and the end face of the front guide portion (13) are completed. Partially pressing and expanding in a radial direction to divide the peripheral side wall surface of the leading portion (13) of the annular groove (15) into a forging step which is inclined and enlarged The end faces of the four corners in the diagonal direction of the nut blank (11b) are ejected by four ejector pins (77) and pressed into a pair of conveying mechanisms located near the end faces of the stampers (53). Between the fingers (58, 58). A manufacturing device for a self-piercing nipper nut is a manufacturing device for a self-piercing nipper nut using a nut forming machine having the following members: a forging die ‧ punch for a nut blank (11a) 67), having an ejector pin (62) and provided at an end surface of the first cylindrical insert (65) An annular projection (66), the ejector pin (62) being disposed to advance in the axial direction of the recess (61) for inserting the preform (52) of the preformed blank (11a) And being pushed by the spring (63) to the retracted position, the first cylindrical insert (65) is externally fitted to the ejector pin (62), and is fixedly disposed on the innermost inner side of the recess (61). Further, on the front end surface of the punch (67) facing the stamper (52), a projection (38) for molding the preliminary hole (12a) of the thread pre-drilled hole (12) is provided, and the pressing has been inserted into the recessed portion The blank (11a) of (61) is held by the punch (67) and the ejector pin (62), and the preliminary holes (12a, 12b) which do not penetrate are formed, and the ring is formed. The projection (66) is press-fitted into the blank (10), and a central portion of the nut body having a quadrangular outer shape including the preliminary hole (12a) is provided, and a cylinder having an end surface that can be driven into a metal plate and used as a punch is provided. a front guiding portion (13), and a side wall (14) protruding along the outer peripheral edge of the nut body to surround the front guiding portion (13), formed between the front guiding portion (13) and the front side wall (14) Annular groove (15); and punching and The leading portion enlarges the forging stamper ‧ punch (53, 80), which is configured to be embossed in the recess (71) of the stamper (53) for inserting the nut blank (11a) in the next step The base of the hole punch (72) is provided with a tapered wall (75) which is outwardly expanded, and is provided with an end surface of the second cylindrical insert (73) which is externally disposed on the punching punch (72). An annular projection (76) into which the annular groove (15) can be inserted is inserted into the cylindrical portion of the concave portion (71) of the stamper (53) of the next step by pressing the nut blank (11a). Between the head (80) and the aforementioned punch punch (72) Cooperating with the action, punching the preliminary holes (11a, 11b) to form the thread pre-drilled hole (12), and the end face portion of the front guide portion (13) is radially oriented by the tapered wall (75) Pressing and expanding, the peripheral side wall surface of the front guide portion (13) for dividing the annular groove (15) is inclined, and the annular groove (15) is formed into a groove that expands inward, and the front guide portion is 13) the outer peripheral edge of the end surface abuts against the inner side surface of the annular protrusion (76) to form a restriction; and the side wall (14) is inclined forged stamper ‧ punch (54, 88), which is configured to have a configuration In the next step, the recess (81) of the stamper (54) for inserting the aforementioned nut blank (11b) of the enlarged punching and leading portion (13) advances backward and backward in the axial direction, and can be spring-loaded. (83) an ejector pin (82) that is pushed to the retracted position, and the innermost surface of the inner side of the recessed portion (81) is provided such that the side wall (14) of the nut blank (11b) is inclined toward the axis side a tapered wall (85) is provided at an end surface of the third cylindrical insert (86) disposed at the bottom of the recess (81) of the stamper (54) in the next lower step, for inserting the ring The annular projection (87) of the groove (15) is inserted into the next step by pressing the nut blank (11b) by a punch (88) facing the stamper (54) of the next step. When the concave portion (81) of the stamper (54) is pressed, the side wall (14) is inclined toward the axis side by the tapered wall (85), and the annular groove (15) is formed into a groove that expands inward. The inner edge of the end surface of the side wall (14) inclined toward the axis side is abutted against the outer side surface of the annular projection (87) to form a restriction, and is characterized by: The punching punch (72) of the punching and leading portion enlarged stamper/punch (53, 80) and the second cylindrical insert (73) are fixed and held by the stamper of the next step (53). Inside the recess (71), and four ejector pins (77) surrounding the punch punch (72) are provided, and the stamper of the next step is inserted by pressing the nut blank (11a). The cylindrical punch (80) of the recess (71) of the (53) and the punching punch (72) cooperate with each other, and the above four ejector pins (77) Finishing the punching holes of the thread pre-drilling hole (12) and the end faces of the four corners in the diagonal direction of the enlarged nut blank (11b) of the aforementioned front guide portion (13) are ejected, and pressed into the aforementioned pressure Between the pair of fingers (58, 58) of the transport mechanism near the end face of the die (53). The manufacturing apparatus of the self-piercing clamp nut according to the second aspect of the invention, wherein the punching punch (72) and the second cylindrical insert (73) are interposed between the brackets (74). The four ejector pins (77) are fixedly held in the recess (71) of the stamper (53) of the next step, and are maintained at a phase of 90 degrees around the punch punch (72). The bracket (74) is attached to the bracket (74) so as to be retracted in the axial direction, and can be pushed to the retracted position by the spring (78). When the vehicle is in the retracted position, the front end surface and the front end surface of the second cylindrical insert (73) are Forming the same plane, and advancing against the end faces of the four corners of the aforementioned nut blank (11b) in the diagonal direction, and ejecting the nut blank (11b), and pressing the pair Between the fingers (58, 58).