JP2013248666A - Method for manufacturing washer faced nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously mold a washer faced nut having a seat in a trumpet shape with high accuracy in a coherent heading step by a multistage heading machine.SOLUTION: A primary molding 1B is formed such that recesses 1b and 1c are molded on both ends of a columnar nut material 1A and a hexagonal part 1d is simultaneously molded on the tip side outer periphery. Then, by applying punching work to the central part of the primary molding 1B, a secondary molding 1C is formed including a hexagon nut part 1f having a through-hole 1e and cylindrical part 1g. Next, a cylindrical portion of the secondary molding 1C is subjected to heading molding so as to protrude in a trumpet shape so that a ternary molding 1D is formed including the hexagon nut part 1f having the through-hole 1e and a seat 1h protruding long in the trumpet shape downward from the bottom face of the hexagon nut part. In the final step, at molding of the ternary molding 1D, a little excess thickness part 1i remaining in an intermediate part of the through-hole 1e is subjected to the punching work so that the hexagon nut part in which the through-hole 1e of the same diameter is formed and a washer faced nut 1 which has the seat 1h in the trumpet shape are formed.

Description

  The present invention relates to a method for manufacturing a seated nut for mass-producing a seated nut having a hexagonal nut portion and a seat portion protruding long like a trumpet downward from its bottom surface with a forging machine.

  In general, as a method of manufacturing a seated nut, for example, a multistage forging machine is used, and as shown in FIG. 3, upsetting is performed on the tip of a cylindrical nut material having a certain size in the first step (a). Next, in the second step (b), recesses as shown in FIG. 3 (b) are respectively formed at both ends of the nut material, and then, in the third forging step (c), the nut material of the second step is formed. The outer periphery on the front end side is molded so as to project in a hexagonal shape, and a deep recess is formed on the rear end, and at the same time, the outer periphery is molded so as to project in a bowl shape. It is known that a nut with a seat is continuously forged by punching a nut material obtained in the process.

  By the way, when manufacturing the seated nut 1 having the hexagonal nut portion 1f and the seat portion 1h projecting downward in a trumpet shape downward from the bottom surface thereof as shown in FIG. 2 (e), the trumpet-shaped seat portion 1h is plastically processed. The amount of processing when doing so increases. For this reason, a large molding load is required, and accuracy is required at the same time as a large amount of processing. Therefore, a nut with a seat having such a trumpet-shaped seat is manufactured using a conventional multi-stage forging machine as it is. However, there is a problem that a high-precision seated nut cannot be obtained and its manufacture becomes difficult.

  Then, this invention makes it a subject to provide the manufacturing method of the nut with a seat which has a trumpet-like seat part which can be shape | molded continuously and highly accurately by the consistent forging process with a multistage type forging machine.

  In order to solve the above-described problem, the invention according to claim 1 of the present application is a method for manufacturing a nut with a seat having a hexagonal nut portion having a through hole in a central portion and a seat portion that protrudes downward in a trumpet shape from the bottom surface thereof. First, upset processing is performed on both ends of a cylindrical nut material of a certain size, and then a recess is formed on each end of the nut material, and at the same time a hexagonal shape is formed on the outer periphery on the tip side. Forming a primary molded body, and then punching the central portion of the primary molded body to form a secondary molded body composed of a front end side hexagon nut portion having a through hole in the center portion and a rear end side cylindrical portion, After that, forging is performed so that the rear end cylindrical portion of the secondary molded body protrudes in a trumpet shape, and a hexagonal nut portion having a through hole in the center portion and a bottom surface of the hexagonal nut portion in a trumpet shape. Tertiary with a long protruding seat In the final finishing step, the hexagonal shape is formed by punching the surplus part that protrudes to the middle part of the through-hole in the final finishing step and forming a through-hole of the same diameter at the center. It is characterized in that a nut with a seat having a nut portion and a seat portion that protrudes downward in a trumpet shape downward from its bottom surface is formed.

  According to the above-described method for manufacturing a nut with a seat, a concave body is formed on both ends of the cylindrical nut material, and at the same time, a primary molded body is formed by molding a hexagonal portion on the outer periphery on the tip side. The center part is punched to form a secondary molded body consisting of a hexagonal nut part with a through hole in the center part and a cylindrical part, and then the rear end cylindrical part of the secondary molded body protrudes in a trumpet shape. As a result of forging forming, a tertiary molded body having a hexagonal nut part having a through hole in the center part and a seat part protruding long in a trumpet shape downward from the bottom surface of the hexagonal nut part is formed. A large amount of processing can be easily obtained by effectively using a through-hole formed in advance in molding a body, and forging can be performed with high accuracy. That is, when the trumpet-shaped seat portion is formed at the rear end portion, it can be easily formed with a small molding load without imposing a large burden on the mold. In addition, in the final finishing process, the third molded body is formed by high-precision forging by punching a small surplus portion left overhanging the intermediate part of the through-hole during the molding of the tertiary molded body. The through-hole penetrated by the same diameter in the center part of the hexagon nut part can be finished with high precision while maintaining the accuracy of the above. Therefore, a nut with a seat having a trumpet-shaped seat portion can be continuously and accurately formed by a multi-stage forging molding machine in a consistent forging process.

It is a cross-sectional view of the principal part of the multistage type forging machine which implements a method of the present invention. It is a top view which shows the forging process of the nut with a seat. It is conventional explanatory drawing.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a manufacturing process when a seated nut having a seat part that protrudes in a trumpet shape downward from the bottom surface of the hex nut body is manufactured by a multistage forging machine. In that case, a cylindrical nut material (not shown) obtained by cutting a metal material made of a long steel rod into a certain size is used, and the nut material is first fed to the first step (a) in FIG. Then, the first punch 11 is placed on the first die 12. As a result, the first nut having the tapered surface 1a at the front end and the concave portion 1b at the rear end is formed by the die hole 12a of the first die 12 and the front end surface of the first punch 11 as shown in FIG. Material 1A is formed.
In addition, as a nut raw material, you may use what cut | disconnected the metal raw material which consists of a wire in a preliminary | backup process as mentioned above to a fixed dimension, and may use the cutting blank previously cut | disconnected by the fixed dimension as a nut raw material.

  Thereafter, the punch 11 retreats and the knockout pin 13 is kicked out to the punch side. The first nut material 1A is pushed out of the die hole 12a of the die 12 and received by a transfer chuck (not shown). It is sent to step 2 (b).

  In the second forging step (b), the second punch 14 advances and pushes the first nut material 1 </ b> A into the mold hole 15 a of the second die 15. As a result, the second nut material 1B (in which a hexagonal portion 1d is formed on the outer periphery of the distal end side at the same time as forming the deep recesses 1b and 1c as shown in FIG. Primary molded body) is formed.

  Thereafter, when the punch 14 retreats and the knockout pin 16 is kicked out to the punch side, the second nut material 1B is pushed out from the die hole 15a of the die 15 and received by the transfer chuck (not shown). It is sent to step 3 (c).

  In the third forging step (c), when the third perforating punch 17 advances and pushes the second nut material 1B into the third die 18, the punching punch 19 in the third die 18 is used to remove the second nut material 1B. A third nut material 1C (secondary molding) comprising a front end side hexagonal nut portion 1f having a through hole 1e in the center portion and a rear end side cylindrical portion 1g as shown in FIG. Body) is formed.

  Thereafter, when the punch 17 retreats and the knockout sleeve 20 provided on the outer periphery of the punching punch 19 is kicked out to the punch side, the third nut member 1C is pushed out from the die hole 18a of the die 18 and is transferred to the transfer chuck (not shown). And is sent to the next fourth forging step (d).

  In the fourth forging step (d), the fourth punch 21 advances and pushes the third nut material 1C into the fourth die 22, so that the third nut material 1C as shown in FIG. A fourth nut member 1D (for example) is provided with a hexagonal nut portion 1f having a through-hole at the center portion and a seat portion 1h that protrudes downward in a trumpet shape downward from the bottom surface thereof by forging so that the portion protrudes in a trumpet shape. A tertiary molded body) is formed. When the seat 1h is formed, the surplus portion 1i is collected at the intermediate portion in the longitudinal direction of the through hole and partially protrudes inward.

  Thereafter, when the punch 21 moves backward and the knockout sleeve 23a provided on the outer periphery of the knockout pin 23 is kicked out to the punch side, the fourth nut member 1D is pushed out from the die hole 22a of the die 22 and is transferred to the transfer chuck (not shown). ) And sent to the next final finishing step (e).

  In the final finishing step (e), the final punching punch 24 advances to push the fourth nut material 1D into the final die 25, while the final punching punch 24 further penetrates the fourth nut material 1D in the final die 25. Punching is performed by punching out a small excess portion 1i left in the middle of the hole 1e. As a result, a seated nut 1 having a hexagonal nut portion 1f in which a through-hole 1e having the same diameter is formed at the center portion as shown in FIG. 2 (e) and a seat portion 1h that protrudes downward in a trumpet shape downward from the bottom surface thereof. Is formed with high accuracy.

  Thereafter, the seated nut 1 is pushed out from the die hole 25a of the die 25 and discharged when the punching punch 24 is retracted and the knockout sleeve 26 is kicked out to the punch side.

  As described above, according to the method for manufacturing a nut with a seat, the second nut member 1B is formed by forming the recesses 1b and 1c at both ends of the first nut member 1A and simultaneously forming the hexagonal portion 1d at the outer periphery on the tip side. After that, the center portion of the second nut material 1B is punched to form a third nut material 1C composed of a hexagonal nut portion 1f having a through hole 1e in the center portion and a cylindrical portion 1g, and so on. After that, forging is performed so that the rear end cylindrical portion of the third nut member 1C protrudes in a trumpet shape, and a hexagonal nut portion having a through hole 1e in the center portion and a seat protruding long in a trumpet shape downward from the bottom surface Since the 4th nut material 1D provided with the part 1h was formed, when processing the 4th nut material 1D, a large amount of processing can be easily obtained by effectively using the through hole 1e formed in advance. Forging to precision It is possible to do this. That is, when the trumpet-shaped seat 1h is formed at the rear end, it can be easily formed with a small molding load without imposing a large burden on the mold. In addition, in the final finishing process, the slight surplus portion 1i left so as to overhang the intermediate portion of the through hole 1e when the fourth nut member 1D is formed is stamped and formed with high accuracy. In addition, the through-hole penetrated with the same diameter at the center of the hexagon nut 1f can be finished with high accuracy while maintaining the accuracy of the fourth nut member 1D.

1 Nuts with Seat 1A First Nut Material 1B Second Nut Material (Primary Molded Body)
1C 3rd nut material (secondary molded product)
1D 4th nut material (tertiary molded product)
1a Tapered surface 1c Recessed portion 1d Hexagonal portion 1e Through hole 1f Hexagonal nut portion 1g Cylindrical portion 1h Seat portion 1i Extra portion

In order to solve the above problem, the invention according to claim 1 of the present application is a method for manufacturing a nut with a seat having a hexagonal nut portion having a through hole in a central portion and a seat portion that protrudes downward in a trumpet shape downward from the bottom surface. First, upset processing is performed on both ends of a cylindrical nut material of a certain size, and then a concave portion is formed on both ends of the nut material, and a hexagonal portion is formed on the outer periphery at the tip side. After forming the molded body, the center portion of the primary molded body is punched to form a secondary molded body composed of a front end side hexagonal nut portion having a through hole in the center portion and a rear end side cylindrical portion. after that, the facilities to the heading shaped to rear cylindrical portion of the secondary molded body protrudes longer like a trumpet, this time, is partially excess thickness portion is collected in the longitudinal direction intermediate portion of the through hole projecting manner by forging molding, the through-hole in the center A hexagonal nut portion for a seat for the projecting from the bottom surface of the hexagonal nut portion long in a trumpet-like downwardly to form a third molding member having a excess thickness portion, further, a final finishing step, the third molding member A hexagonal nut part that has a through-hole of the same diameter formed in the center part by punching the surplus part that protrudes to the middle part of the through-hole at the time of molding, and a seat that protrudes downward in a trumpet shape from the bottom surface A seated nut having a portion is formed.

According to the above-described method for manufacturing a nut with a seat, a concave body is formed on both ends of the cylindrical nut material, and at the same time, a primary molded body is formed by molding a hexagonal portion on the outer periphery on the tip side. The center part is punched to form a secondary molded body consisting of a hexagonal nut part having a through hole in the center part and a cylindrical part. After that, the rear end cylindrical part of the secondary molded body is elongated in a trumpet shape. with facilities to the heading shaped so as to protrude, this time actively with heading shaped so as to protrude a part is gathered excess thickness portion in the longitudinal direction intermediate portion of the through hole, the through hole in the center Since a tertiary molded body having a hexagonal nut portion , a seat portion that protrudes downward in a trumpet shape downward from the bottom surface of the hexagonal nut portion, and a surplus portion is formed, it is formed in advance when molding the tertiary molded body. Large amount of processing by effectively using the through-holes It is possible to easily obtain, can be heading processing flaring seat with high accuracy projecting longer. That is, when molding the trumpet-shaped seat to the rear end of the hexagonal nut portion can be easily formed without causing a large burden on the mold with a small forming load. Moreover, in the final finishing process, the precision of the tertiary molded body that has been compacted and formed with high accuracy by punching the remaining excess portion so as to overhang the intermediate part of the through-hole during the molding of the tertiary molded body. The through-hole penetrated by the same diameter by the center part of the hexagon nut part can be finished with high precision in the state which maintained this.

Claims (1)

  A method of manufacturing a nut with a seat having a hexagonal nut portion having a through hole in the center and a seat portion that protrudes downward in a trumpet shape downward from the bottom surface. Next, forming the concave parts at both ends of the nut material, and simultaneously forming the hexagonal shape part at the outer periphery of the tip side to form a primary molded body, and then punching the central part of the primary molded body Then, a secondary molded body composed of a front end side hexagonal nut portion having a through hole in the center and a rear end side cylindrical portion is formed, and then the rear end cylindrical portion of the secondary molded body protrudes in a trumpet shape. To form a tertiary molded body having a hexagonal nut portion having a through hole in the central portion and a seat portion protruding long in a trumpet shape downward from the bottom surface of the hexagonal nut portion. In the finishing process, the formation of the tertiary compact A hexagonal nut part that has a through hole with the same diameter formed in the center part, and a seat part that protrudes downward in a trumpet shape from the bottom surface. A method of manufacturing a seated nut, comprising:

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