JP2011136367A - Method of manufacturing nut having vertical groove - Google Patents

Method of manufacturing nut having vertical groove Download PDF

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JP2011136367A
JP2011136367A JP2009299625A JP2009299625A JP2011136367A JP 2011136367 A JP2011136367 A JP 2011136367A JP 2009299625 A JP2009299625 A JP 2009299625A JP 2009299625 A JP2009299625 A JP 2009299625A JP 2011136367 A JP2011136367 A JP 2011136367A
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nut
die
forging
longitudinal groove
polygonal
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JP4962891B2 (en
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Yasutada Nakamura
泰忠 中村
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DAIICHI RASHI KOGYO KK
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DAIICHI RASHI KOGYO KK
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Abstract

<P>PROBLEM TO BE SOLVED: To effectively prolong the life of projecting ribs which are provided on a die to draw vertical grooves while recessed vertical grooves are workable simply and surely in rectangular parts of a nut material in a series of heading processes. <P>SOLUTION: In a pre-heading step, a tapered face is headed at the top of a columnar nut material having fixed dimensions and a recessed part 1c which is deeper than the vertical grooves to be formed on the rear end is headed and also the whole outer periphery or the side of the rear end of the outer periphery is formed into a polygonal shape. In the next heading step, the nut material 1<SB>2</SB>obtained in the pre-heading step is upset into the die hole 18a of a die 18 after taking the turnabout of 180° and drawn with a plurality of projecting ribs 19 which are projected radially inward on the die hole 18a, by performing the heading while relieving the drawn excess material so as to overhang in the recessed part of the polygonal part 1d, the vertical grooves 1e are formed on the face between respective polygonal parts 1d and, in a succeeding step, punching is performed to the nut material which is obtained in the preceding step. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、六角等の多角ナットの外周面部に凹状の縦溝を圧造により製造する方法に関する。  The present invention relates to a method for manufacturing a concave vertical groove on an outer peripheral surface portion of a polygonal nut such as a hexagon by forging.

従来、軽量化と材料の節減を図りかつ締付工具による締付けをより確実に行えるようにするため、多角ナットの外周面に凹状縦溝を成形するようにした縦溝付きナットを圧造により製造する方法としては、たとえば、一定寸法の円柱状ナット材における先端にテーパ面を、また後端に凹部を形成する第１の予備圧造工程を経て、ナット材の後端にさらに深い窪み部を圧造すると同時に外周を多角状に張り出すように成形する第２の予備圧造工程と、前工程で得られたナット材をダイス型孔に据え込んで該型孔に放射内方へ突出する複数の突条リブで絞り余肉を多角部の窪み部内に張り出すように逃がしながら圧造して各多角部間の面に縦溝を形成する第３の圧造工程と、第３の圧造工程で得られたナット材をダイス型孔に据え込んでナット座面にフランジ部を成形する第４の圧造工程と、最終工程で第４の圧造工程で得られたナット材の孔抜きを順次に連続して行うようにしたものが知られている。
特開昭６３−２９９８３９号公報 Conventionally, for the purpose of reducing the weight and saving material and more reliably tightening with a tightening tool, a nut with a longitudinal groove in which a concave longitudinal groove is formed on the outer peripheral surface of a polygonal nut is manufactured by forging. As a method, for example, a deeper recess is formed at the rear end of the nut material through a first preliminary forging step in which a tapered surface is formed at the front end of the cylindrical nut material of a certain size and a recess is formed at the rear end. At the same time, a second preliminary forging step in which the outer periphery is formed to project into a polygonal shape, and a plurality of protrusions that project the nut material obtained in the previous step into a die die hole and project radially inward into the die hole A third forging step in which the ribs are forcibly evacuated so as to protrude into the recesses of the polygonal portion and ribs are formed in the surface between the polygonal portions, and the nut obtained in the third forging step Nut seat with material installed in die hole A fourth heading step of forming the flange portion, is the piercing of the resultant nut member in the fourth heading process in the final step obtained by the sequentially performed continuously known.
JP-A 63-299839

ところで、上記した縦溝を有するナットの製造方法によれば、連続多段フォーマーを用いて予備成形から圧造仕上げ工程に至る一連の工程の中で凹状の縦溝をナット材の角形部に簡単確実に加工することができる反面、第３の圧造工程において、縦溝を絞り成形するためにダイスに設ける突状リブへの絞り抵抗がきわめて大きく、そのため、局部的な摩耗が激しくて寿命が短く、短期間で突状リブを交換しなければならない問題を有していた。  By the way, according to the method for producing a nut having a longitudinal groove as described above, the concave longitudinal groove is easily and reliably formed in the square portion of the nut material in a series of processes from the preforming to the forging finishing process using a continuous multi-stage former. Although it can be processed, in the third forging process, the drawing resistance to the projecting ribs provided on the die for drawing the longitudinal grooves is extremely large, so the local wear is intense, the life is short, and the short-term It had the problem that the protruding ribs had to be exchanged between.

そこで、本発明は、上記した問題に鑑み発明したもので、連続多段フォーマーを用いて予備成形から圧造仕上げ工程に至る一連の工程の中で凹状の縦溝をナット材の角形部に簡単確実に加工することができながら、縦溝を絞り成形するためにダイスに設ける突状リブの寿命を効果的に延ばすことができる縦溝を有するナットの製造方法の提供を課題とする。  Therefore, the present invention has been invented in view of the above-mentioned problems, and in a series of processes from preforming to forging finishing process using a continuous multi-stage former, the concave vertical groove is easily and reliably formed in the square part of the nut material. It is an object of the present invention to provide a method for manufacturing a nut having a longitudinal groove that can be processed and can effectively extend the life of the protruding rib provided on the die for drawing the longitudinal groove.

上記した問題を解決するために、本願の請求項１記載の発明は、金属素材をパンチとダイスで順次連続的に鍛圧して多角部と各多角部間のに軸方向に沿う縦溝を有するナットの製造方法でにおいて、予備圧造工程にて、一定寸法の円柱状ナット材における先端にテーパ面を、また後端に形成すべき縦溝よりも深い窪み部を圧造すると共に、外周全体又は外周の後端側を多角状に成形し、次の圧造工程にて、予備圧造工程で得られたナット材を１８０°方向転換させたうえでダイス型孔に据え込んで該型孔に放射内方へ突出する複数の突条リブで絞り、その絞り余肉を多角部の窪み部内に張り出すように逃がしながら圧造して各多角部間の面に縦溝を形成し、その後の工程で前の圧造工程で得られたナット材に孔抜きを行うように構成したことを特徴とする。  In order to solve the above-mentioned problem, the invention according to claim 1 of the present application has a longitudinal groove along the axial direction between a polygonal portion and each polygonal portion by successively forging a metal material successively with a punch and a die. In the nut manufacturing method, in the preliminary forging step, a tapered surface is formed at the front end of the cylindrical nut material of a certain size, and a hollow portion deeper than the longitudinal groove to be formed at the rear end is formed, and the entire outer periphery or outer periphery The rear end side is formed into a polygonal shape, and the nut material obtained in the preliminary forging step is turned 180 ° in the next forging step, and then placed in the die die hole to radiate inward into the die hole. The ribs are squeezed with a plurality of projecting ribs, and the squeezed excess is squeezed out so as to protrude into the recesses of the polygonal part to form vertical grooves on the surfaces between the polygonal parts. It was configured to punch holes in the nut material obtained in the forging process. And features.

また、本願の請求項２記載の発明は、請求項１記載の次の圧造工程における複数の突条リブの内面を、その根元部側内面から先端部側内面に至る程半径方向外方に傾斜する形状として、縦溝を絞り成形する際、ナット材のボリュームの移動がスムーズに流れるようにしたことを特徴とする。  In the invention according to claim 2 of the present application, the inner surfaces of the plurality of ribs in the next forging step according to claim 1 are inclined outward in the radial direction from the root side inner surface to the tip end side inner surface. As a shape to be formed, when the longitudinal groove is drawn, the volume of the nut material is smoothly moved.

本発明によれば、連続多段フォーマーを用いて予備成形から圧造仕上げ工程に至る一連の工程の中で凹状の縦溝をナット材の角形部に簡単確実に加工することができながら、しかも、次の圧造工程において、そのダイス型孔に放射内方へ突出する複数の突条リブで角形部に縦溝を絞り成形する際、その絞り余肉を角形部部分の窪み部内に張り出すように逃がしながら絞り成形するようにしたから、縦溝を絞り成形する際の絞り抵抗を積極的に少なくすることができ、これにより、突条リブの摩耗を減らし、突条リブの長期にわたる使用を可能にすることができる。  According to the present invention, while using a continuous multi-stage former, a concave vertical groove can be easily and reliably processed into a square part of a nut material in a series of processes from preforming to forging finishing process. In the forging process, when the vertical groove is drawn into the square part with a plurality of projecting ribs projecting radially inward into the die mold hole, the drawing surplus is allowed to escape into the hollow part of the square part. However, the drawing resistance during drawing of the longitudinal groove can be actively reduced, thereby reducing the wear of the ribs and allowing the ribs to be used for a long time. can do.

また、次の圧造工程における複数の突条リブの内面を、その根元部側内面から先端部側内面に至る程半径方向外方に傾斜するように形状して、縦溝を形成する際、ナット材のボリュームの移動がスムーズに流れるように構成すれば、縦溝を形成する際の絞り抵抗をより一層抑えることができて工具寿命を延ばすことができるのでこのましい。  Further, when forming the longitudinal groove by forming the inner surface of the plurality of protruding ribs in the next forging step so as to incline radially outward from the root side inner surface to the tip end side inner surface, If it is configured so that the movement of the volume of the material flows smoothly, it is possible to further suppress the drawing resistance when forming the longitudinal groove and to extend the tool life, which is preferable.

以下、本発明の実施の形態を図に基づいて説明する。  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、縦溝を有するフランジ付きナットの圧造工程を示すもので、連続した鋼製の丸棒からなる金属材料を一定寸法に切断して円柱状のナット材（図示せず）を形成し、そのナット材を第１の予備圧造工程ａへ送り込んで第１のパンチ１１で第１のダイス１２へ据え込むと、ダイス１２の型孔１２ａとパンチ１１先端面によって、先端にテーパ面１ａを、また後端に凹部１ｂを形成するナット材１１が形成される。（図２ａ）なお、ナット材としては、予備工程で線材からなる金属素材を一定寸法に切断したものを用いる他、予め一定寸法に切断した切断ブランクをナット材１として用いてもよいこと勿論である。FIG. 1 shows a forging process of a flanged nut having a longitudinal groove, and a cylindrical nut material (not shown) is formed by cutting a metal material made of continuous steel round bars into a certain size. When the nut material is fed into the first preliminary forging step a and is installed in the first die 12 with the first punch 11, the taper surface 1a is formed at the tip by the die hole 12a of the die 12 and the tip end surface of the punch 11. and a nut member 1 1 to form a concave portion 1b at the rear end is formed. (FIG. 2 a) As a nut material, a metal blank made of a wire material in a preliminary process is cut to a certain size, and a cutting blank cut in advance to a certain size may be used as the nut material 1. is there.

その後、パンチ１１が後退し同時にノックアウトピン１３が突出すると、ナット材１１はダイス１２の型孔１２ａより押し出され、これをトランスファチャック（図示せず）で受け取り、次の第２の予備圧造工程ｂへ送り込む。Thereafter, the knock-out pin 13 at the same time the punch 11 is retracted to project, the nut member 1 1 is extruded from the die hole 12a of the die 12, which receives a transfer chuck (not shown), the following second pre-heading step Send to b.

第２の予備圧造工程ｂでは、第２のパンチ１４が前進してナット材１１を第２のダイス１５の型孔１５ａ内へ据え込むと、ナット材１１の後端にさらに深い窪み部１ｃが圧造されると同時に外周に角形部（六角形状）１ｄが成形され、ナット材１２が形成される。（図２ｂ）In the second pre-forging step b, and the second punch 14 upsetting the nut member 1 1 and advanced to the second die 15 of the die hole 15a in, deeper recess in the rear end of the nut member 1 1 1c is molded prismatic section (hexagonal) 1d at the same time the outer periphery Once heading, the nut member 1 2 is formed. (Fig. 2b)

その後、パンチ１４が後退し同時にノックアウトピン１６が突出すると、ナット材１２はダイス１５の型孔１５ａより押し出され、これをトランスファチャックで受け取り、ナット材１２を１８０°方向転換したうえで次の第３の圧造工程ｃへ送り込む。Thereafter, the knock-out pin 16 at the same time the punch 14 is retracted to project, following the nut member 1 2 is extruded from the die hole 15a of the die 15, which receives a transfer chuck, a nut member 1 2 after having converted the 180 ° direction To the third forging step c.

第３の圧造工程ｃでは、第３のパンチが前進して前工程で得られたナット材１２をダイス１８の型孔１８ａ内へ圧入させる。In a third heading step c, thereby press-fitting the nut member 1 2 obtained in the previous step to the third punch is advanced into the die hole 18a of the die 18.

第３のダイス１８の型孔１８ａには、図３に示すように放射内方へ突出する突条リブ１９が円周等間隔に配備されており、したがってこの突条リブ１９によって角形部１ｄの面が絞られるようにしごかれて角形部１ｄに縦溝１ｅが成形されると同時に他端に凹溝１ｆが成形され、ナット材１３が形成される。（図２ｃ）As shown in FIG. 3, ribs 19 projecting radially inwardly are provided in the mold hole 18 a of the third die 18 at equal circumferential intervals. Therefore, the ribs 19 form the rectangular portion 1 d. surface groove 1f is molded at the same time the other end the longitudinal groove 1e is formed in the squeezed is in rectangular portion 1d so squeezed has a nut member 1 3 is formed. (Fig. 2c)

ここで、そのダイス１８の型孔１８ａに放射内方へ突出する複数の突条リブ１９で角形部１ｄの面に縦溝１ｅを絞り成形する際、図３に示すようにその絞り余肉を角形部１ｄの窪み部１ｃ内に張り出すように逃がしながら絞り成形するようにしている。また、絞り成形時、角形部１ｄのボリュームの移動がよりスムーズに流れるように複数の突条リブ１９の内面を、図４における仮想線で示すようにその根元部側内面から先端部側内面に至る程半径方向外方に１°程度傾斜させている。  Here, when the vertical groove 1e is drawn on the surface of the square portion 1d with a plurality of ribs 19 projecting radially inward into the die hole 18a of the die 18, as shown in FIG. Drawing is performed while escaping so as to protrude into the hollow portion 1c of the square portion 1d. Further, during drawing, the inner surface of the plurality of rib ribs 19 is moved from the root side inner surface to the tip end side inner surface as shown by the phantom line in FIG. 4 so that the volume movement of the rectangular portion 1d flows more smoothly. It is inclined about 1 ° outward in the radial direction.

その後、パンチ１８が後退し同時にノックアウトピン２０が突出すると、ナット材１３はダイス１８の型孔１８ａより押し出され、これをトランスファチャックで受け取り、次の第４の圧造工程ｄへ送り込む。Then, at the same time the punch 18 is retracted knockout pin 20 is protruded, the nut member 1 3 is pushed out from the die hole 18a of the die 18, which receives a transfer chuck, fed to the next fourth heading step d.

第４の圧造工程ｄでは、第４のパンチ２１が前進して前工程で得られたナット材１３をダイス２２の型孔２２ａ内へ圧入させる。In the fourth heading step d, it is pressed nut member 1 3 obtained in the previous step a fourth punch 21 is advanced into the die hole 22a of the die 22.

第４のダイス２２の型孔２２ａにはナット材１３の角形部１ｄの先端側を受け止める凹所とフランジ成形用凹部とが形成されており、したがってこのフランジ成形用凹部によってナット材１３の座面（後端側）にフランジ部１ｇが成形され、フランジ部１ｇ付きのナット材１４が形成される。（図２ｄ）It is formed with a recess and the flange molding recess to receive the front end side of the nut member 1 3 prismatic portion 1d is in the die hole 22a of the fourth die 22, thus the nut member 1 3 This flanging recess flange 1g is formed on the seating surface (rear end side), the nut member 1 4 flanged portion 1g is formed. (Fig. 2d)

その後、パンチ２１が後退し同時にノックアウトピン２３が突出すると、ナット材１４はダイス２２型孔の２２ａより押し出され、これをトランスファチャックで受け取り、次の第５の最終工程ｅへ送り込む。Thereafter, the knock-out pin 23 at the same time the punch 21 is retracted to project, the nut member 1 4 is extruded from 22a in the die 22 inch bore, which receives a transfer chuck, feeding to the next fifth final step e.

この最終工程ｅでは、孔抜きパンチ２４が前進してナット材１４をダイス２５内へ押し込むとダイス２５はばね２６の付勢に抗して後方へ押しやられ、その結果、ダイス２５の型孔２５ａの底部中心を貫通する孔抜きポンチ２７で中心部が打ち抜かれて孔部２ａを有する最終ナット材２が形成される。（図２ｅ）In the final step e, the die 25 when in piercing punch 24 moves forward pushing the nut member 1 4 into the die 25 is pushed rearwardly against the bias of the spring 26, as a result, die hole of the die 25 The final nut material 2 having the hole 2a is formed by punching the center with a punching punch 27 that penetrates the center of the bottom of 25a. (Fig. 2e)

この最終ナット材２はパンチ２４の後退と同時にノックアウトピン２８が突出すると、最終ナット材２がダイス２５の型孔２５ａより排出される。  When the knockout pin 28 protrudes simultaneously with the retraction of the punch 24, the final nut material 2 is discharged from the die hole 25a of the die 25.

その後、この最終ナット材２はねじタップ立て等によりねじが施され、図４及び図５に示すような角形部１ｄに縦溝１ｅが形成された中心部にねじ３ａが形成された製品ナット３が得られる。なお、必要に応じて、縦溝１ｅの先端側底部の上面を押圧して内方へ変形するようにかしめ、緩み止めのための膨出部を備えた製品ナット３を形成するようにしてもよい。  Thereafter, the final nut member 2 is threaded by a screw tapping stand or the like, and a product nut 3 in which a screw 3a is formed in a central portion where a vertical groove 1e is formed in a square portion 1d as shown in FIGS. Is obtained. If necessary, the top surface of the bottom of the longitudinal groove 1e is pressed and deformed inward to form a product nut 3 having a bulging portion for preventing loosening. Good.

以上のように本発明によれば、連続多段フォーマーを用いて予備成形から圧造仕上げ工程に至る一連の工程の中で凹状の縦溝１ｅをナット材の角形部１ｄに簡単確実に加工することができながら、しかも、第３の圧造工程ｃにおいて、そのダイス１８の型孔１８ａに放射内方へ突出する複数の突条リブ１９で各角形部１ｄに縦溝１ｅを絞り成形する際、その絞り余肉を多角部の窪み部１ｃ内に張り出すように逃がしながら絞り成形するようにしたから、縦溝１ｅを絞り成形する際の絞り抵抗を積極的に少なくすることができ、これにより、突条リブ１９の摩耗を効果的に減らし、突条リブ１９の長期にわたる使用を可能にすることができる。  As described above, according to the present invention, the concave vertical groove 1e can be easily and surely processed into the square portion 1d of the nut material in a series of processes from the preforming to the forging finishing process using the continuous multistage former. In addition, in the third forging step c, when the vertical grooves 1e are drawn into the respective square portions 1d with a plurality of projecting ribs 19 projecting radially inward into the mold hole 18a of the die 18, the drawing is performed. Since the excess thickness is drawn while escaping so as to protrude into the polygonal recess 1c, the drawing resistance when drawing the longitudinal groove 1e can be actively reduced. The wear of the ribs 19 can be effectively reduced, and the long ribs 19 can be used over a long period of time.

また、第３の圧造工程ｃにおける複数の突条リブ１９の内面を、その根元部側内面から先端部側内面に至る程半径方向外方に傾斜する形状として、縦溝１ｅを成形する際、角形部１ｄのボリュームの移動がスムーズに流れるように構成しているので、縦溝１ｅを形成する際の絞り抵抗をより一層抑えることができて工具寿命を延ばすことができる。  In addition, when forming the longitudinal groove 1e, the inner surface of the plurality of ribs 19 in the third forging step c is inclined radially outward from the root side inner surface to the tip end side inner surface, Since the movement of the volume of the square portion 1d flows smoothly, the drawing resistance when forming the vertical groove 1e can be further suppressed, and the tool life can be extended.

図６は縦溝を有するフランジ付きナットの別の実施の形態を示す。その場合、まず、一定寸法の円柱状のナット材を第１の予備圧造工程ａに送り込んで据え込み加工を行い、先端にテーパ面１ａを有するナット材１１を形成する。（図６ａ）FIG. 6 shows another embodiment of a flanged nut having a longitudinal groove. In that case, we first upsetting by feeding a cylindrical nut member fixed dimension in the first pre-forging step a, forming a nut member 1 1 having a tapered surface 1a at the tip. (Fig. 6a)

次に、ナット材１１を１８０°方向転換したうえで第２の予備圧造工程ｂへ送り込み、据え込み加工を行って先端部に球状部を、また後端部に角形部（六角形状）１ｄを成形し、かつ後端に求める縦溝１ｅよりもやや深い窪み部１ｃを成形して、ナット材１２を形成する。（図６ｂ）Then, the nut member 1 1 infeed after having converted the 180 ° direction to the second pre-forging step b, square portion of the spherical portion at the tip by performing the upsetting, also the rear end portion (hexagonal) 1d molding the, and by molding a slightly deeper recess 1c than longitudinal groove 1e for obtaining the rear end to form a nut member 1 2. (Fig. 6b)

その後、ナット材１２を１８０°方向転換したうえで第３の圧造工程ｃへ送り込み、型孔内の突条リブによって角形部１ｄの面に絞り加工を行って角形部１ｄに縦溝１ｅを成形すると共に他端に凹溝１ｆとフランジ部１ｇを成形し、ナット材１３を形成する。（図６ｃ）
ここで、ダイスの型孔に放射内方へ突出する複数の突条リブで各角形部１ｄに縦溝１ｅを絞り成形する際には、先の実施の形態の場合と同様の絞り手段を採用してその絞り余肉を多角部の窪み部１ｃ内に張り出すように逃がしながら絞り成形するのである。Thereafter, the nut member 1 2 fed to a third heading step c after having converted the 180 ° direction, the rectangular portion 1d performs drawing on the surface of the rectangular portion 1d by projection rib within the die hole flutes 1e the other end as well as molding by molding a groove 1f and the flange portion 1g, forms a nut member 1 3. (Fig. 6c)
Here, when the vertical groove 1e is drawn into each square part 1d with a plurality of ribs protruding radially inward into the die hole of the die, the same drawing means as in the previous embodiment is adopted. Then, the drawing surplus is drawn while escaping so as to protrude into the recessed portion 1c of the polygonal portion.

さらに、ナット材１３を最終工程ｅへ送り込み、型孔に設けられた孔抜きポンチで中心部が打ち抜かれて孔部２ａを有する最終ナット材２を形成するようにしたものである。（図６ｄ）Furthermore, feeding a nut member 1 3 to the final step e, in which center by punching punch provided in the mold holes is to form the final nut member 2 having a punched with holes 2a. (Fig. 6d)

図７は縦溝を有するフランジ付きナットのさらに別の実施の形態を示す。その場合、まず、一定寸法の円柱状のナット材を第１の予備圧造工程ａに送り込んで据え込み加工を行い、先端にテーパ面１ａを、また後端に求める縦溝１ｅよりもやや深い窪み部１ｃを成形し、ナット材１１を形成する。（図７ａ）FIG. 7 shows yet another embodiment of a flanged nut having a longitudinal groove. In that case, first, a cylindrical nut material having a certain size is sent to the first preliminary forging step a to perform upsetting, and the tapered surface 1a is formed at the tip, and the dent slightly deeper than the longitudinal groove 1e required at the rear end. part 1c molded, thereby forming a nut member 1 1. (Fig. 7a)

次に、ナット材１１を１８０°方向転換したうえで第２の圧造工程ｂへ送り込み、型孔内への据え込み加工を行ってその先端部に角形部（六角形状）１ｄを成形すると同時に型孔内の突条リブによって角形部１ｄの面に絞り加工を行って角形部１ｄに縦溝１ｅを成形し、かつ後端にフランジ予備部１ｇ′を成形して、ナット材１２を形成する。（図７ｂ）
ここで、ダイスの型孔に放射内方へ突出する複数の突条リブで各角形部１ｄに縦溝１ｅを絞り成形する際には、先の実施の形態の場合と同様の絞り手段を採用してその絞り余肉を多角部の窪み部１ｃ内に張り出すように逃がしながら絞り成形するのである。Then, the nut member 1 1 infeed after having converted the 180 ° direction to the second heading step b, performing upsetting to types hole when forming the rectangular portion (hexagonal) 1d at its distal end at the same time shaped longitudinal grooves 1e in the square portion 1d performs drawing on the surface of the rectangular portion 1d by projection rib in the mold pores, and then molding the pre-flanged portion 1 g 'at the rear end, forming a nut member 1 2 To do. (Fig. 7b)
Here, when the vertical groove 1e is drawn into each square part 1d with a plurality of ribs protruding radially inward into the die hole of the die, the same drawing means as in the previous embodiment is adopted. Then, the drawing surplus is drawn while escaping so as to protrude into the recessed portion 1c of the polygonal portion.

その後、ナット材１２を第３の圧造工程ｃへ送り込み、型孔内への据え込み加工を行って先端部にフランジ部１ｇと凹所を成形して、ナット材１３を形成する。（図７ｃ）Thereafter, fed a nut member 1 2 to the third heading step c, to form the flange portion 1g and the recess in the distal portion performs upsetting to types hole, forming a nut member 1 3. (Fig. 7c)

さらに、ナット材１３を最終工程ｅへ送り込み、型孔に設けられた孔抜きポンチで中心部を打ち抜いて孔部２ａを有する最終ナット材２を形成するようにしたものである。（図７ｄ）Furthermore, feeding a nut member 1 3 to the final step e, is obtained as by punching the central portion in the punching punch provided in the die hole to form the final nut member 2 having a hole portion 2a. (Fig. 7d)

これらの製造方法で縦溝を有するフランジ付きナットを製造する場合にも、突条リブによる縦溝１ｅの成形時における作用効果は、先の実施の形態で説明した突条リブ１９による縦溝１ｅの成形時における作用効果と同様のものが得られ、一連の圧造工程の中で凹状の縦溝１ｅをナット材１３の角形部１ｄに簡単確実に加工できながら、縦溝１ｅを絞り成形するためにダイスに設ける突状リブの寿命を効果的に延ばすことができる。Even in the case of manufacturing a flanged nut having a longitudinal groove by these manufacturing methods, the operational effect at the time of forming the longitudinal groove 1e by the projecting rib is the longitudinal groove 1e by the projecting rib 19 described in the previous embodiment. is obtained those similar to the operation and effect during molding, while easily ensuring processed concave flutes 1e squareness portion 1d of the nut member 1 3 in a series of forging step, draw forming a longitudinal groove 1e Therefore, the life of the protruding rib provided on the die can be effectively extended.

また、上記した実施の形態では、いずれについてもフランジ部１ｇを備えたナット２の製造方法について説明したけれども、フランジ部１ｇをもたないナット２についても本発明を適用できることは勿論である。  In the above-described embodiments, the method for manufacturing the nut 2 provided with the flange portion 1g has been described. However, the present invention can of course be applied to the nut 2 that does not have the flange portion 1g.

本発明方法を実施する圧造装置部の横断面図である。  It is a cross-sectional view of the forging apparatus part which implements a method of the present invention. ナットの圧造課程を示す平面図である。  It is a top view which shows the forging process of a nut. 図１のＡ−Ａからみたダイス圧造部の断面図である。  It is sectional drawing of the die forging part seen from AA of FIG. 製品ナットの一部断面で示す正面図である。  It is a front view shown with a partial section of a product nut. 製品ナットの平面図である。  It is a top view of a product nut. 別のナットの圧造課程を示す平面図である。  It is a top view which shows the forging process of another nut. さらに別のナットの圧造課程を示す平面図である。  It is a top view which shows the forging process of another nut.

１１ ナット材
１２ ナット材
１３ ナット材
１４ ナット材
２ 製品ナット
１９ 突状リブ
１ａ テーパ面
１ｂ 凹部
１ｃ 窪み部
１ｄ 角形部
１ｅ 縦溝DESCRIPTION OF SYMBOLS 1 1 Nut material 1 2 Nut material 1 3 Nut material 1 4 Nut material 2 Product nut 19 Protruding rib 1a Tapered surface 1b Recessed part 1c Recessed part 1d Square part 1e Longitudinal groove

Claims (2)

金属素材をパンチとダイスで順次連続的に鍛圧して多角部と各多角部間のに軸方向に沿う縦溝を有するナットの製造方法において、予備圧造工程にて、一定寸法の円柱状ナット材における先端にテーパ面を、また後端に形成すべき縦溝よりも深い窪み部を圧造すると共に、外周全体又は外周の後端側を多角状に成形し、次の圧造工程にて、予備圧造工程で得られたナット材を１８０°方向転換させたうえでダイス型孔に据え込んで該型孔に放射内方へ突出する複数の突条リブで絞り、その絞り余肉を多角部の窪み部内に張り出すように逃がしながら圧造して各多角部間の面に縦溝を形成し、その後の工程で前の圧造工程で得られたナット材に孔抜きを行うようにしたことを特徴とする縦溝を有するナットの製造方法。  In a method for manufacturing a nut having a longitudinal groove along the axial direction between a polygonal portion and each polygonal portion by successively forging a metal material with a punch and a die, a cylindrical nut material having a fixed size in a preliminary forging step In addition to forming a tapered surface at the front end and a recess deeper than the longitudinal groove to be formed at the rear end, the entire outer periphery or the rear end side of the outer periphery is formed into a polygonal shape, and preliminary forging is performed in the next forging step. The nut material obtained in the process is turned 180 °, placed in a die mold hole, and squeezed with a plurality of projecting ribs projecting radially inward into the mold hole. It is characterized in that it is forged so as to project into the part and formed into vertical grooves in the surface between each polygonal part, and the nut material obtained in the previous forging process is punched in the subsequent process. A method for producing a nut having a longitudinal groove. 次の圧造工程における複数の突条リブの内面を、その根元部側内面から先端部側内面に至る程半径方向外方に傾斜する形状として、縦溝を絞り成形する際、ナット材のボリュームの移動がスムーズに流れるように構成したことを特徴とする請求項１記載の縦溝を有するナットの製造方法。  The inner surface of the plurality of ribs in the next forging process has a shape that inclines radially outward from the root side inner surface to the tip end side inner surface. The method for producing a nut having a longitudinal groove according to claim 1, wherein the movement is configured to flow smoothly.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015508870A (en) * 2012-02-01 2015-03-23 ヘビ ゲー．ビンカー ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディト ゲゼルシャフト nut
KR101698723B1 (en) * 2016-05-30 2017-02-01 장필규 Method for manufacturing lock nut
CN111822639A (en) * 2020-07-13 2020-10-27 浙江明泰控股发展股份有限公司 Machining die assembly of eccentric screw sleeve and machining method of machining die assembly
TWI785902B (en) * 2021-11-24 2022-12-01 財團法人金屬工業研究發展中心 Manufacturing method for nut

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4818410B1 (en) * 1967-08-05 1973-06-06
JPS53142369A (en) * 1977-05-18 1978-12-12 Michio Takeda Method of cold forming nut with groove and dies for working it
JPS5940010A (en) * 1982-08-31 1984-03-05 野々山　勝 Method of machining light nut
JPS63299839A (en) * 1987-05-30 1988-12-07 Sakamura Sangyo Kk Method and device for manufacturing fluted nut

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4818410B1 (en) * 1967-08-05 1973-06-06
JPS53142369A (en) * 1977-05-18 1978-12-12 Michio Takeda Method of cold forming nut with groove and dies for working it
JPS5940010A (en) * 1982-08-31 1984-03-05 野々山　勝 Method of machining light nut
JPS63299839A (en) * 1987-05-30 1988-12-07 Sakamura Sangyo Kk Method and device for manufacturing fluted nut

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015508870A (en) * 2012-02-01 2015-03-23 ヘビ ゲー．ビンカー ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディト ゲゼルシャフト nut
KR101698723B1 (en) * 2016-05-30 2017-02-01 장필규 Method for manufacturing lock nut
CN111822639A (en) * 2020-07-13 2020-10-27 浙江明泰控股发展股份有限公司 Machining die assembly of eccentric screw sleeve and machining method of machining die assembly
TWI785902B (en) * 2021-11-24 2022-12-01 財團法人金屬工業研究發展中心 Manufacturing method for nut

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