JP2005103637A - Heading method for a plurality of members containing washers - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heading method by which a plurality of members containing washers can efficiently be produced from one piece of blank without producing scraps by utilizing a multistage former. <P>SOLUTION: In the first process S1, the blank A which has been cut off to a prescribed size is punched to form one piece of a heading blank 1 composed of a disk part 1a and a columnar part 1b projected in a concentric and a unified manner therewith, and in the second process S2, the columnar part 1b is punched out with a piercing tool 17 and cut into a ring-like washer 2 and a columnar body 1c. Thereafter, the washer 2 is taken out while only the residual columnar body 1c is shifted to the third process S3, and in and after the third process S3, the columnar body 1c is formed by the heading into a prescribed shape-cap nut 3 step by step without producing scraps. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention relates to a method for forging a plurality of members including a washer that includes a washer with a washer and a plurality of bolts and nuts with a washer from a single material and forge-forming in a scrapless manner.

  Conventionally, when manufacturing a cap nut with a washer or a bolt and nut with a washer, the washer is usually made by stamping a metal plate with a press, while a bolt or a metal bar is used separately from the washer. A nut or a cap nut is formed by forging.

Problems to be solved by the invention

  By the way, when manufacturing bolt nuts with washers and washers with expensive materials such as titanium, washers and cap nuts, washers and bolts and nuts are manufactured separately as described above, and washers According to the method of forming a metal plate by punching a metal plate, a large number of ring bodies are punched from a single metal plate, so that a large material loss occurs in the metal plate after punching, and the cut surface of the ring body is rough due to shearing. Therefore, it has been necessary to finish, and as a result, there was a problem that it was expensive and laborious.

  Therefore, the present invention relates to a method for forging a plurality of members including a washer that can efficiently produce a plurality of members including a washer from a single material using a multi-stage homer in a scrapless manner.

Means for solving the problem

  In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is a single piece comprising a disk part and a cylindrical part projecting concentrically and integrally with the material cut into a predetermined dimension in the first step. In the second step, the cylindrical part is punched with a piercing tool to divide it into a ring-shaped washer and a cylindrical body, and then the washer is removed, while only the remaining cylindrical body is transferred to the third step. In the third and subsequent steps, the cylindrical body is forcibly formed into a cap nut having a predetermined shape in a scrapless manner.

  The invention according to claim 2 of the present application punches the material cut into a predetermined size in the first step, and forges one forging material composed of a disk portion and a first cylindrical portion projecting concentrically therewith. Then, in the second step, the first cylindrical portion is punched with a piercing tool to divide it into a ring-shaped washer and the first cylindrical body, and then the washer is taken out, while only the remaining first cylindrical body is transferred to the third step. In the third step, the first cylindrical body is punched to forge the polygonal nut portion and the second cylindrical portion projecting concentrically therewith. In the fourth step, the second cylindrical portion is punched with a facing tool. Dividing into a polygonal nut and a second cylindrical body, and then removing the polygonal nut, only the remaining second cylindrical body is transferred to the fifth step, and the second cylindrical body is predetermined in the steps after the fifth step. Forged head-forming bolts in a step-less manner without scrap Characterized in that was.

  The invention according to claim 3 of the present application corresponds to the structure according to claim 2 in order to cope with breakage damage and fiber flow disturbance and work hardening that occur when punched in the second step and the fourth step. In addition, when forming the polygonal nut part in the third step, a hole is formed in the central portion of the upper surface of the nut part, and damage to the flange part of the hole part during the forging in the second step and disturbance of the fiber flow While encapsulating the work-hardened portion, the second cylindrical body divided in the fourth step is turned 180 degrees and transferred to the fifth step, and damage damage and fiber flow disturbance generated during forging in the fourth step The direction is changed so that the work-hardened portion is positioned at the tip portion of the shaft portion of the headed bolt.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a forging process of a cap nut with a washer according to the method of the present invention. A washer 2 and the washer 2 as shown in FIG. The cap nut 3 that engages and holds the bottom is obtained without scrap.

  First, in the cutting step 10, a continuous titanium round bar (titanium wire) W is intermittently fed from the quill tip 11, and is cut by a cutter 12 that crosses the tip 11, and is cut into a predetermined dimension. The titanium material A is obtained. The titanium material A thus obtained is pushed to the front part of the die 13 in the first step S1 simultaneously with the cutting, and is subjected to the first punching by the corresponding punch 14. The die 13 is provided with a knockout pin 15 which becomes the bottom of the mold hole 13a at the time of punching, and a die 13 including the pin 15 and a punch 14 colliding with the die 13 form a space of a necessary shape. Push into 13. Then, the one forging material 1 which consists of the disc part 1a and the cylindrical part 1b which protrudes concentrically with this is formed. Simultaneously with the retraction of the punch 14, the knockout pin 15 protrudes to push out the forging material 1 from the inside of the die 13, and the forging material 1 is supplied immediately before the die 16 in the second step S <b> 2 by a chuck (not shown).

  In the second step, the forged material 1 is pressed with the facing tool 17 to punch out the cylindrical portion 1b. Then, the disc part 1a separated from the cylindrical part 1b becomes a ring-shaped washer 2, and the cylindrical part 1b becomes a cylindrical body 1c. When the cylindrical body 1c punched out in this way is pushed out by the knockout pin 18, it is carried by a chuck (not shown) immediately before the die 19 in the third step S3, and pressed against the die 19 by the punch 21, then a hat A forged material 1d is formed. When this forged material 1d is extruded by the knockout pin 22, it is carried by a chuck (not shown) immediately before the die 23 in the fourth step S4, and pressed against the die 23 by the punch 24, the hemispherical head 1e ' A bag-like forging material 1e having a cylindrical portion 1e ″ is formed. This forging material 1e is extruded with a knockout pin 25, and it is conveyed by a chuck (not shown) immediately before the die 26 in the fifth step S5. Is pressed toward the die 26 with the punch 27 to form a cap nut 3 having a hemispherical head portion 3a, a cylindrical portion 3b, a flange portion 3c, and a cylindrical protruding portion 3d. It is pushed out by the knockout pin 28 and taken out from the die 26.

  As shown in FIG. 2, the washer 2 and the cap nut 3 are formed on the outer periphery of the cylindrical protruding portion 3d after the inner screw 3e is formed on the inner peripheral surface of the cap nut 3 in the subsequent step of the fifth step. In a state where the washer 2 is fitted, the tip end portion of the cylindrical projecting portion 3d is expanded so that the fitted state is maintained.

  In the present invention, as described above, the washer 2 and the cap nut 3 are efficiently formed in a scrapless manner by a multi-stage homer from a single titanium material A, so that the washer and the cap nut are individually manufactured as in the prior art. The material loss can be eliminated as compared with the case where the washer is formed by punching a metal plate, and it can be provided at a low cost.

  FIG. 3 shows another embodiment, showing a forging process of a washer, a nut and a bolt according to the method of the present invention. In the cutting process and the following 6 processes, a washer and a nut are formed from one titanium material. Bolts are obtained without producing scrap.

  First, in the cutting step 30, a continuous titanium round bar (titanium wire) W is intermittently sent from the quill tip 31 and cut by a cutter 32 crossing the tip 31 so as to be cut into a predetermined size. The titanium material B is obtained. The titanium material B thus obtained is pushed to the front part of the die 33 in the first step T1 simultaneously with the cutting, and is subjected to the first punching by the corresponding punch 34. The die 34 is provided with a knockout pin 35 that becomes the bottom of the mold hole 33a when punching. A die 33 including the pin 35 and a punch 34 colliding with the die 35 form a necessary space. Push into 33. Then, the one 1st forging raw material 4 consisting of the disc part 4a and the 1st cylindrical part 4b which protrudes concentrically with this is formed. Simultaneously with the retraction of the punch 34, the knockout pin 35 protrudes to push out the forging material 4 from the die 33, and the forging material 4 is fed to the front of the die 36 in the second step T2 by a chuck (not shown).

  In the second step T2, the forging material 4 is pressed with the facing tool 37, and the first cylindrical portion 4b is punched out. Then, the disc body 4a separated from the first cylindrical portion 4b becomes a ring-shaped washer 5, and the cylindrical portion 4b becomes a first cylindrical body 4b '. The first cylindrical body 4b 'punched out in this way is pushed out by a knockout pin 38, carried by a chuck (not shown) immediately before the die 38 in the third step T3, and pressed by the punch 39 toward the die 38. As a result, the first cylindrical body 4b ′ is punched to form the second forging material 6 having the polygonal nut portion 6a and the second cylindrical portion 6b projecting concentrically therewith. Here, in the third step, when the polygonal nut portion 6a is formed, a hole 6a 'is formed in the center of the upper surface of the nut portion 6a, and the second portion is formed at the back of the hole 6a' as shown in FIG. Damaged scratches, fiber flow disturbances, and work-hardened portions (A) generated during forging in step T2 are enclosed.

  Then, the second forged material 6 is pushed out by the knockout pin 40, conveyed by a chuck (not shown) immediately before the die 41 in the fourth step T4, and pressed toward the die 41 by the punch 42, thereby the second cylindrical portion. 6b is punched with a facing tool 42 and divided into a polygonal nut 7 and a second cylindrical body 6b '. The second cylindrical body 6b 'punched out in this way is pushed out by the knockout pin 43, carried by a chuck (not shown) immediately before the die 44 in the fifth step T5, and pressed toward the die 44 by the punch 45. To do. Then, the 3rd forging material 8 which consists of the head 8a and the axial part 8b is formed. In that case, the second cylindrical body 6a 'divided in the fourth step T4 is turned 180 degrees by a chuck (not shown) and transferred to the fifth step T5, and the forging in the fourth step T4 as shown in FIG. The direction is changed so that breakage scratches, fiber flow disturbances, and work-hardened portions (b) that occur sometimes are positioned at the tip portion of the shaft portion 9b of the head bolt 9 described later.

  When this forged material 8 is extruded with a knockout pin 46, it is carried by a chuck (not shown) immediately before the die 47 in the sixth step T6, and pressed against the die 47 with a punch 48, a head having a hexagonal hole portion is obtained. A headed bolt 9 in which the portion 9a and the shaft portion 9b are integrated is formed. Thereafter, the headed bolt 9 is pushed out by the knockout pin 49 and taken out from the die 47.

  In a later step, an inner screw (not shown) is provided on the inner peripheral surface of the nut 7, and an outer screw (not shown) is screwed on the outer periphery of the shaft portion 9 b of the headed bolt 9. Is formed.

  As described above, since the washer 5, the nut 6 and the bolt 9 are efficiently formed by scrapless by a multistage homer from one titanium material B, the washer and the cap nut are individually manufactured as in the past, Material loss can be eliminated as compared with the case where the washer is formed by punching a metal plate, and the washer can be provided at low cost.

  Further, a hole 6a 'is formed in the center of the upper surface of the nut portion 6a during the molding of the polygonal nut portion 6a in the third step T3, and is generated at the back of the hole 6a' during the forging in the second step T2. While enclosing the damaged scratches, fiber flow disturbances and work hardened portions, the second cylindrical body 6b 'divided in the fourth step T4 is turned 180 degrees and transferred to the fifth step T5, and in the fourth step T4. In the second step T2 and the fourth step T4, the direction is changed so that the damaged scratches, the disturbance of the fiber flow, and the work-hardened portion that occur during the forging of the bolt are positioned at the tip portion of the shaft portion 9b of the bolt 9. It is possible to cope with the damage scratches, fiber flow disturbances, and work-hardened portions (A) and (B) that occur when punched, so that the nut 7 and the head bolt 9 are not adversely affected.

  In the above-described embodiment, the description has been made on the case where an expensive titanium material is used as the material. However, the present invention is not limited to the titanium material.

The invention's effect

  As described above, according to the molding method of the invention described in claim 1 of the present application, the washer and the cap nut are efficiently forcibly formed by a multistage homer in a scrapless manner from a single material. As compared with the case where the cap nut is manufactured separately and the washer is formed by punching a metal plate, the material loss can be eliminated, and it can be provided at a low cost.

  In addition, according to the molding method of the invention described in claim 2 of the present application, the washer, the nut and the bolt are efficiently forcibly molded by a multi-stage homer from a single material. The material loss can be eliminated as compared with the case of forming by punching a metal plate, and it can be provided at a low cost.

  Furthermore, in the molding method of the invention according to claim 2, a hole is formed in the central portion of the top surface of the nut portion at the time of molding the polygonal nut portion in the third step, and the deep portion of the hole portion is formed in the second step. While encapsulating damaged scratches, fiber flow disturbances and work-hardened parts that occur during forging, the second cylindrical body divided in the fourth step is turned 180 degrees and transferred to the fifth step. If the direction change is made so that the damaged scratches, fiber flow disturbances and work hardened parts that occur during forging are located at the tip of the screw forming part of the headed bolt, it is punched in the second and fourth steps. This is preferable because it can cope with damage scratches, turbulence of fiber flow and work hardening that do not adversely affect the nuts and bolts.

  It is explanatory drawing which shows the forging process of the cap nut provided with the washer by the method of this invention.   It is a longitudinal cross-sectional view which shows the assembly state of the bag nut.   It is explanatory drawing which shows another embodiment.   It is explanatory drawing of the fiber flow of the raw material at the time of reaching the 5th process from the 4th process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Forging material 1a Disk part 1b Column part 1c Column body 2 Washer 3 Cap nut A Titanium material S1 1st process S2 2nd process S3 3rd process S4 4th process S5 5th process 4 Forged material 4a Disc part 4b 1st 1 cylindrical portion 4b 'first cylindrical body 5 washer 6a polygonal nut portion 6a' hole 6b second cylindrical portion 6b 'second cylindrical body 9 head bolt 9b shaft portion 37 facing tool 42 facing tool B titanium material T1 first step T2 2nd process T3 3rd process T4 4th process T5 5th process T6 6th process

Claims (3)

  The material cut to a predetermined size in the first step is punched to forge one forging material consisting of a disc part and a cylindrical part projecting concentrically therewith, and in the second process, the cylindrical part is punched with a piercing tool. The ring-shaped washer and the cylindrical body are divided, and then the washer is taken out, while only the remaining cylindrical body is transferred to the third step, and the cylindrical body is formed into a cap nut having a predetermined shape in the third and subsequent steps. A method for forging a plurality of members including a washer, wherein the forging is steplessly formed in a scrapless manner.   The material cut in a predetermined dimension in the first step is punched to forge one forging material composed of a disk portion and a first cylindrical portion projecting concentrically therewith, and in the second step, the first cylindrical portion is formed. Punched with a piercing tool and divided into a ring-shaped washer and a first cylindrical body, and then the washer is taken out, while only the remaining first cylindrical body is transferred to the third step, and the first column in the third step The body is punched to forge the polygonal nut part and the second cylindrical part projecting concentrically therewith, and in the fourth step, the second cylindrical part is punched with a facing tool and divided into a polygonal nut and a second cylindrical body. Then, while removing the polygonal nut, only the remaining second cylindrical body is transferred to the fifth step, and in the steps after the fifth step, the second cylindrical body is scraplessly formed into a head bolt having a predetermined shape. Including a washer characterized in that it is forging molded Heading method of a few members.   A hole is formed at the center of the upper surface of the nut portion during molding of the polygonal nut portion in the third step, and damage and fiber flow turbulence and processing that occur during forging in the second step are formed in the inner portion of the hole portion. While encapsulating the hardened part, the second cylindrical body divided in the 4th step is turned 180 degrees and transferred to the 5th step, and damage damage and fiber flow disturbances that occur during forging in the 4th step and work hardening 3. The method for forging a plurality of members including a washer according to claim 2, wherein the direction is changed so that the portion is positioned at a tip portion of the shaft portion of the head bolt.

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