JPS5920410B2 - Forming method for self-tap forming screws - Google Patents
Forming method for self-tap forming screwsInfo
- Publication number
- JPS5920410B2 JPS5920410B2 JP14742780A JP14742780A JPS5920410B2 JP S5920410 B2 JPS5920410 B2 JP S5920410B2 JP 14742780 A JP14742780 A JP 14742780A JP 14742780 A JP14742780 A JP 14742780A JP S5920410 B2 JPS5920410 B2 JP S5920410B2
- Authority
- JP
- Japan
- Prior art keywords
- thread
- screw
- truncated conical
- shaft portion
- molded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
【発明の詳細な説明】
本発明は、自己タップフォーミングねじの成型法に関し
、特に、斯るタッピングねじにおけるねじ込みトルク特
性の改善及びねじ込み後における螺着保持力の増大を目
的とすると共に雌ねじ刻設用穴に対するねじ込み姿勢の
適正化を目的として開発された成型法に係わるものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a self-tap forming screw, and in particular, aims to improve the screwing torque characteristics of such a self-tapping screw and increase the screw retention force after screwing, as well as to improve the screw forming method by forming a female thread. This relates to a molding method developed for the purpose of optimizing the screwing position relative to the screw hole.
従来、この種、公知のタッピングねじの成型法としては
、例えば、特公昭５４−３１７５７号公報がある。A conventionally known method for molding a tapping screw of this type is disclosed in Japanese Patent Publication No. 31757/1983, for example.
この成型法によれば、第１図乃至第４図に示すように、
ねじ転造前のねじ素材１を円柱形軸部２と、この円柱形
軸部２の後端部に形成したドライバーの係合溝を有する
頭部３と、円柱形軸部２の先端部に形成した截頭円錐形
軸部４とで構成すると共に、上記円柱形軸部２の一部及
び上記截頭円錐形軸部４の先端面に及ぶ領域に、ねじ素
材の円周方向に等間隔で且つ、ねじ素材の軸心線に平行
な平面部５を３個成型し、次いで、上記截頭円錐形軸部
４先端面より該截頭円錐形軸部４及び円柱形軸部全域に
雄ねじを転造する成型法によって雄ねじ杆を成型してい
たため、雄ねじ杆を雌ねじ刻設用穴にねじ込むに際して
雄ねじ杆の雌ねじ刻設用穴に対する正常な姿勢が得がた
く、雄ねじ杆の中心線が雌ねじ刻設用穴の中心線に対し
て傾斜した姿勢でねじ込まれることとなり、不完全な状
態で雌ねじが刻設されたり、不完全な状態で螺合が行な
われたりするので、多少の振動によっても螺着保持力が
弛むとか、或は、ねじ込み時又はねじ込み後に雌ねじ部
材に亀裂が生じるとかの欠点があり、又、仮りに、上記
欠点を解消すべく、雄ねじ杆の雌ねじ刻設用穴に対する
ねじ込み姿勢の適正化を計らんとすると、これに余分な
時間を要することとなり、迅速なるねじ込み作業が得ら
れない欠点が生じる。According to this molding method, as shown in FIGS. 1 to 4,
A screw material 1 before thread rolling is attached to a cylindrical shaft portion 2, a head portion 3 having a driver engagement groove formed at the rear end of the cylindrical shaft portion 2, and a tip portion of the cylindrical shaft portion 2. The truncated conical shaft part 4 is formed, and in a region extending to a part of the cylindrical shaft part 2 and the distal end surface of the frustoconical shaft part 4, there are screw holes arranged at equal intervals in the circumferential direction of the screw material. Then, three flat parts 5 parallel to the axial center line of the screw material are molded, and then a male thread is formed from the tip surface of the frusto-conical shaft part 4 to the entire area of the frusto-conical shaft part 4 and the cylindrical shaft part. Because the male threaded rod was formed using a molding method that involves rolling the male threaded rod, when screwing the male threaded rod into the female threaded hole, it was difficult to obtain a normal posture of the male threaded rod relative to the female threaded hole, and the center line of the male threaded rod was not aligned with the female threaded hole. The screws will be screwed in at an angle to the center line of the hole for engraving, and the female thread will be carved in an incomplete state or the threaded connection will be performed in an incomplete state. There are drawbacks such as the screw retaining force loosening or cracks occurring in the female thread member during or after screwing in, and in order to eliminate the above drawbacks, it is necessary to screw the male threaded rod into the female thread hole. If an attempt is made to optimize the posture, it will take extra time to do so, resulting in the disadvantage that a quick screw-in operation cannot be achieved.
又、上記平面部５の円柱形軸部２における成型端部６は
第３図に示すように平面部５上面と円柱形軸部２外周面
との間に略垂直状の段差７が成型されているため、ねじ
転造に際し、第４図に示すように、平面部５の存在によ
って成型される誘導雄ねじ山部８における正常な雄ねじ
山部９に達する直前のねじ山に深いスプーン状欠落部８
′が形成され、従って、この直後に欠落部のない正常な
ねじ山９が転造されているので、ねじ込み時に、この部
分におけるねじ込みトルクが急に増大することとなり、
迅速且つ円滑なねじ込み作業が得られないと共に、ねじ
込み後における螺着保持力にも欠ける等の欠点があり、
更に、上記段差７はねじ素材の冷間押出成型によって得
られるため、押出し金型に大きな負荷がかかり金型が長
期使用に酔え得ないとか、或は場合によっては金型が破
損するとか等の欠点があった。Further, as shown in FIG. 3, the molded end portion 6 of the cylindrical shaft portion 2 of the flat portion 5 has a substantially vertical step 7 formed between the upper surface of the flat portion 5 and the outer peripheral surface of the cylindrical shaft portion 2. Therefore, during thread rolling, as shown in FIG. 4, a deep spoon-shaped missing part is formed in the thread just before reaching the normal male thread part 9 in the guiding male thread part 8 formed due to the presence of the flat part 5. 8
' is formed, and therefore, a normal thread 9 with no missing parts is rolled immediately after this, so when screwing in, the screwing torque at this part suddenly increases,
There are drawbacks such as not being able to quickly and smoothly screw in the work, but also lacking in screw retention force after screwing.
Furthermore, since the step 7 is obtained by cold extrusion molding of the screw material, a large load is placed on the extrusion mold, which may prevent the mold from being used for a long period of time, or may damage the mold in some cases. There were drawbacks.
本発明は、上記従来の各欠点を改良するために提供され
たもので、その要旨は、雄ねじを転造する円柱形軸部と
、この円柱形軸部の先端部に該円柱形軸部と同心円の截
頭円錐形軸部を成型してなるねじ素材において、截頭円
錐形軸部の先端部に所要長さの雌ねじ刻設用穴に対する
挿入ガイド用の截頭円錐形軸端部を残留させ、該截頭円
錐形軸端部上位から上記円柱形軸部の一部に及ぶ領域に
、ねじ素材の円周方向に等間隔で且つねじ素材の軸心線
に平行に３個の平面部を成型すると共に、該平面部の上
記円柱形軸部における成型端辺に該円柱形軸部の円周方
向に弧面であって且つ先細となるデルタ形領域を成型し
、次いで、上記截頭円錐形軸端部を残した截頭円錐形軸
部及び円柱形軸部の全域に雄ねじ山を転造し、この転造
によって上記デルタ形領域に正常な雄ねじ山に近づくに
従い一定中のスプーン状欠落部が除々に浅くなる誘導雄
ねじ山部を成型したことにあり、特に、円柱形軸部の平
面部端辺に成型したデルタ領域の存在により、ねじ素材
の冷間押出成型時に押出し金型に無理がかからず、金型
の長期使用を可能とすると共にねじ素材加工の能率向上
を計り、加えて平面部及び上記デルタ形領域に成型され
た上記公知例とは形態の異なる誘導雄ねじ山部により、
ねじ込みトルク特性の改善並びにねじ込み後における螺
着保持力の増大を計ることにあり、更に、ねじ転造時に
転造されない截頭円錐形軸端部の存在により、雌ねじ刻
設用穴に対する座わりが良く、適正な姿勢でのねじ込み
を可能としたことを特徴とするものである。The present invention was provided in order to improve each of the above-mentioned conventional drawbacks, and its gist is to provide a cylindrical shaft portion for rolling a male thread, and a cylindrical shaft portion at the tip of the cylindrical shaft portion. In a screw material formed by molding concentric truncated conical shafts, a truncated conical shaft end remains at the tip of the truncated conical shaft to serve as an insertion guide into a hole for carving a female thread of the required length. and in a region extending from the upper part of the truncated conical shaft end to a part of the cylindrical shaft part, three flat parts are arranged at equal intervals in the circumferential direction of the thread material and parallel to the axis of the thread material. At the same time, a delta-shaped region that is an arcuate surface and tapered in the circumferential direction of the cylindrical shaft is molded on the molded end side of the cylindrical shaft of the flat part, and then the truncated A male thread is rolled in the entire area of the truncated conical shaft part and the cylindrical shaft part, leaving the conical shaft end, and by this rolling, a constant spoon-like thread is formed in the delta-shaped area as it approaches the normal male thread. This is due to the molding of an induction male thread where the missing portion gradually becomes shallower.In particular, due to the presence of a delta region molded on the flat end of the cylindrical shaft, it is difficult to fit into the extrusion mold during cold extrusion of the thread material. In order to make it possible to use the mold for a long time without straining, and to improve the efficiency of processing the thread material, in addition, the induction male thread part has a different form from the above-mentioned known example, which is molded in the flat part and the delta-shaped area. According to
The objective is to improve the screwing torque characteristics and increase the screw holding force after screwing.Furthermore, due to the presence of the truncated conical shaft end that is not rolled during thread rolling, it is easy to seat the female thread in the hole. It is characterized by being able to be screwed in in a good and proper posture.
以下、一実施例として示した図面につき、本発明の自己
タップフォーミングねじの成型法を説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of forming a self-tap forming screw according to the present invention will be described below with reference to the drawings shown as an example.
第５図乃至第１２図において、１０はねじ素材で、この
ねじ素材１０は円柱形軸部１１と、この円柱形軸部１１
の一端部に成型された例えばドライバ係合溝１２を有す
る比較的大きな頭部１３と、円柱形軸部１１の他端部、
即ち先端部に成型された先細状の截頭円錐形軸部１４と
から形成されており、上記截頭円錐形軸部１４の先端部
に所要長さの雌ねじ刻設穴に対するねじ込み直前におけ
る挿入ガイド用の截頭円錐形軸端部１５を残留させ、こ
の截頭円錐形軸端部１５の上位から上記円柱形軸部１１
の一部に及ぶ領域に、円周方向に等間隔で且つ上記ねじ
素材１０の軸心線に平行に３個の平面部１６を成型する
。5 to 12, 10 is a screw material, and this screw material 10 has a cylindrical shaft portion 11 and a cylindrical shaft portion 11.
a relatively large head 13 having, for example, a driver engagement groove 12 molded at one end; the other end of the cylindrical shaft 11;
That is, it is formed from a tapered truncated conical shaft part 14 molded at the tip thereof, and serves as an insertion guide immediately before screwing into a female screw hole of a required length in the tip part of the truncated conical shaft part 14. The cylindrical shaft portion 11 is left behind, and the cylindrical shaft portion 11 is inserted from above the frusto-conical shaft end portion 15.
Three flat parts 16 are molded at equal intervals in the circumferential direction and parallel to the axis of the screw material 10 in a region covering a part of the screw material 10.
この平面部１６の成型によって、第４図に示すように、
上記截頭円錐形軸部１４にあっては上記円柱形軸部１１
に達するに伴ない巾広くなるような第１デルタ形領域１
７に形成され、且つ上記円柱形軸部１１にあっては上記
デルタ形領域１７の広巾と間中のねじ素材１０の軸方向
に長い長方形領域１８に形成されると共に、該長方形領
域１８の円柱形軸部１１における成型端辺１８′に該円
柱形軸部１１の円周方向に弧面で且つ先細となる第２デ
ルタ領域１９が形成される。By molding this flat part 16, as shown in FIG.
In the truncated conical shaft portion 14, the cylindrical shaft portion 11
The first delta-shaped region 1 becomes wider as it reaches
7, and the cylindrical shaft portion 11 is formed into a rectangular region 18 which is elongated in the axial direction of the thread material 10 between the delta-shaped region 17 and the cylindrical shape of the rectangular region 18. A second delta region 19 having an arcuate surface and tapering in the circumferential direction of the cylindrical shaft portion 11 is formed on the molded end side 18' of the cylindrical shaft portion 11.
上記ねじ素材成型によって、第５図Ｃ−Ｃ線の断面形状
は第７図Ａに示すように正円形となり、第５図Ｃ−Ｃ線
の断面形状は第７図Ｂに示すように截頭円錐形軸部の外
形を形成する円弧面と平面部の第１デルタ形領域を形成
する比較的短い直線との組合せで略円形に近い形状を呈
し、第５図Ｃ−Ｃ線の断面形状は第７図Ｃに示すように
円柱形軸部の外形を形成する円弧と平面部の長方形領域
を形成する比較的長い直線との組合せで略三角形に近い
形状を呈し、第５図Ｃ−Ｃ線の断面形状は第７図りに示
すように円柱形軸部の外形を形成する径の大きな円弧面
と第２デルタ形領域を形成する小さな円弧面との組合せ
で略円形に近い形状を呈し、第５図Ｃ−Ｃ線の断面形状
は第７図Ｅに示すように正円形を呈している。Due to the above-described molding of the screw material, the cross-sectional shape taken along the line C-C in FIG. 5 becomes a perfect circle as shown in FIG. 7A, and the cross-sectional shape taken along the line C-C in FIG. The combination of the circular arc surface forming the outer shape of the conical shaft part and the relatively short straight line forming the first delta-shaped area of the flat part presents a nearly circular shape, and the cross-sectional shape taken along line C-C in FIG. As shown in FIG. 7C, the combination of the circular arc forming the outer shape of the cylindrical shaft portion and the relatively long straight line forming the rectangular area of the plane portion creates a shape close to a triangle, and the shape is approximately triangular as shown in FIG. As shown in Figure 7, the cross-sectional shape of the cylindrical shaft part has a nearly circular shape due to the combination of the circular arc surface with a large diameter forming the outer shape of the cylindrical shaft part and the small circular arc surface forming the second delta-shaped area. The cross-sectional shape taken along the line CC in FIG. 5 is a perfect circle as shown in FIG. 7E.
次に、第８図に示すように、上記截頭円錐形軸端部１５
を残して、截頭円錐形軸部１４及び円柱形軸部１１の全
域に転造によって雄ねじ山２０を成型する。Next, as shown in FIG. 8, the truncated conical shaft end 15
A male thread 20 is formed by rolling over the entire area of the truncated conical shaft portion 14 and the cylindrical shaft portion 11, leaving .
このねじ転造によって、上記平面部１６のうち第１デル
タ形領域１７相互間の截頭円錐形軸部１４に第１予備雌
ねじ刻設用雄ねじ山２１が転造されると同時に、上記平
面部１６のうち長方形領域１８相互間の円柱形軸部１１
に第２予備雌ねじ刻設用雄ねじ山２２が転造され、第２
デルタ領域１９に第３予備雌ねじ刻設用雄ねじ山２２′
が転造されると共に上記平面部１６の成型されていない
円柱形軸部１１に正常な雄ねじ山２３が転造される。As a result of this thread rolling, a male thread 21 for forming a first preliminary internal thread is rolled in the truncated conical shaft portion 14 between the first delta-shaped regions 17 of the flat portion 16, and at the same time, the flat portion Rectangular areas 18 out of 16 cylindrical shaft parts 11 between each other
The male thread 22 for carving the second preliminary female thread is rolled, and the second
A male thread 22' for carving a third preliminary female thread in the delta area 19.
is rolled, and a normal male thread 23 is rolled on the unmolded cylindrical shaft portion 11 of the flat portion 16.
更に、上記ねじ転造によって、上記平面部のうち第１デ
ルタ形領域１７には第１デルタ形領域の広巾方向に向う
に従って円周方向への長さが除々に長くなるスプーン状
欠落部２４′を有する第１誘導雄ねじ山２４を転造する
と同時に、上記長方形領域１８には円周方向への長さが
等しいスプーン状欠落部２５′を有する第２誘導雄ねじ
山２５を転造すると共に、上記第２デルタ形領域１９に
は上記正常な雄ねじ山２３に近づくに従って除々に高く
なり且つ円周方向の長さを等しくしたスプーン状欠落部
２６′を有する第３誘導雄ねじ山２６を転造する。Further, due to the thread rolling, the first delta-shaped region 17 of the plane portion has a spoon-shaped cutout portion 24' whose length in the circumferential direction gradually increases as it goes in the width direction of the first delta-shaped region. At the same time, a second male lead thread 25 having a spoon-shaped cutout 25' having the same length in the circumferential direction is rolled in the rectangular region 18, and In the second delta-shaped region 19, a third lead-in male thread 26 is rolled, which has a spoon-shaped cutout 26' whose height is gradually increased as it approaches the normal male thread 23 and whose length in the circumferential direction is equal.
更に、上記ねじの転造によって型どられる上記各誘導雄
ねじ山部のねじ山の形状は第９図に示されている。Further, the shape of the thread of each of the male guide thread portions formed by rolling the thread is shown in FIG.
即ち、第８図において截頭円錐形軸端部におけるＡ−Ａ
線の断面形状は第１０図Ａに示すようにその外形がその
ままの真円形であるが、第８図における第１デルタ形領
域のＢ−Ｂ線の断面形状には第１０図Ｂに示すように第
１デルタ形領域に相当する部分に比較的浅いスプーン状
欠落部２４′が成型され、第８図における長方形領域の
Ｃ−Ｃ線の断面形状は第１０図Ｃに示すように、長方形
領域に相当する部分に比較的深いスプーン状欠落部２５
′が成型され、第８図における第２デルタ形領域のＤ−
Ｄ線の断面形状は第１０図に示すように、第２デルタ形
領域に相当する部分に中高状のスプーン状欠落部２６′
が成型され、第８図における円柱形軸部のＥ−Ｅ線の断
面形状は第１０図Ｅに示すように真円形である。That is, in FIG. 8, A-A at the end of the truncated conical shaft
The cross-sectional shape of the line is exactly circular as shown in Figure 10A, but the cross-sectional shape of the line B-B in the first delta-shaped area in Figure 8 has a shape as shown in Figure 10B. A relatively shallow spoon-shaped cutout 24' is formed in a portion corresponding to the first delta-shaped area, and the cross-sectional shape of the rectangular area taken along line C--C in FIG. 8 is a rectangular area as shown in FIG. A relatively deep spoon-shaped cutout 25 in a portion corresponding to
' is molded, and D- of the second delta-shaped area in FIG.
As shown in FIG. 10, the cross-sectional shape of line D has a spoon-shaped missing portion 26' in a portion corresponding to the second delta-shaped area.
is molded, and the cross-sectional shape of the cylindrical shaft portion taken along line E--E in FIG. 8 is a perfect circle as shown in FIG. 10E.
第１２図は本発明のねじ素材１０の成型に使用する冷間
押出し金型２７を示し、２８はねじ素材１０に平面部を
成型する突条部であって、との突条部２８の一端部には
ねじ素材１０に第２デルタ形領域を成型する円周方向に
弧面で且つ先細状の端面２９が形成されている。FIG. 12 shows a cold extrusion mold 27 used for molding the thread material 10 of the present invention, and 28 is a protrusion for molding a flat part on the thread material 10, one end of the protrusion 28. A circumferentially arcuate and tapered end surface 29 is formed on the thread material 10 to form a second delta-shaped region.
３Ｑ／ｌｉ成型されたねじ素材１０を該金型２７より外
方に抜き出すための押棒である。This is a push rod for extracting the 3Q/li molded screw material 10 outward from the mold 27.
上述のように成型された自己タップフォーミングねじを
、例えばプラスチック製の雌ねじ部材に穿けた雌ねじ刻
設用穴にタッピングしながらねじ込むに際し、次の利点
が得られる。When the self-tapping forming screw formed as described above is tapped into a female thread forming hole drilled in a female threaded member made of plastic, for example, the following advantages are obtained.
即ち、截頭円錐形軸部１４の先端部に形成したねじ山の
転造されない雌ねじ刻設用穴に対するねじ込み前におけ
る挿入ガイド用の截頭円錐形軸端部１５の存在により、
ねじ杆のねじ込み前における雌ねじ刻設用穴に対する座
わりが良く、従って、極めて容易に同軸心を一致させる
ことができるので適正な姿勢でねじ込み作業を進めるこ
とができ、ねじ込み時又はねじ込み後に雌ねじ側に亀裂
が生じる恐れは全くない。That is, due to the presence of the truncated conical shaft end 15 for guiding insertion before screwing into the female screw threading hole in which the thread is not rolled, which is formed at the tip of the truncated conical shaft 14,
The threaded rod has a good seating position in the hole for carving the female thread before screwing in, and therefore the coaxial centers can be aligned extremely easily, allowing the screwing work to be carried out in an appropriate posture. There is no risk of cracking.
又、第１．２及び３誘導雄ねじ山２４．．２５及び２６
の存在により、この部分におけるねじ込み過程のねじ込
みトルク特性が小さく、従って無理なく極めて円滑にね
じ込むことができ、特にねじ込み時に第２デルタ形領域
１９に成型された第３誘導雄ねじ山２６によって、正常
なねじ山に移行する場合のねじ込みトルクが除々に大き
くなり、円滑に正常なねじ山に移行することができる。Also, No. 1, 2 and 3 lead male screw threads 24. ．． 25 and 26
Due to the presence of this part, the screwing torque characteristic during the screwing process in this part is small, and therefore screwing can be done very smoothly without any difficulty. In particular, the third induction male screw thread 26 formed in the second delta-shaped region 19 during screwing in The screwing torque gradually increases when transitioning to a threaded thread, allowing a smooth transition to a normal threaded thread.
更に、第１０図に示すように、ねじ転造後における平面
部の第１デルタ形領域１７の断面形状、長方形領域１８
の断面形状が夫々異形に形成されているので、ねじ込み
後における螺着保持力が増大して、振動によって弛む恐
れはなく、従って、螺合時と同じ保持力が維持できる。Furthermore, as shown in FIG. 10, the cross-sectional shape of the first delta-shaped region 17 of the plane part after thread rolling, and the rectangular region 18
Since the cross-sectional shapes of the screws are each shaped irregularly, the screw holding force after screwing is increased, and there is no fear that the screws will loosen due to vibration, so that the same holding force as when screwed together can be maintained.
更に、円柱形軸部１１における平面部１６端辺に該円柱
形軸部１１の円周方向に弧面とし、且つ先細状の第２デ
ルタ形領域１９を形成したからねじ素材の冷間押出し加
工を無理なく円滑に行なうことができ、従って押出し金
型の破損等を未然に防止し、長期使用に耐え得られる。Furthermore, since the end side of the flat part 16 of the cylindrical shaft part 11 is made into an arc surface in the circumferential direction of the cylindrical shaft part 11 and a tapered second delta-shaped region 19 is formed, the thread material can be cold extruded. This can be carried out easily and smoothly, thus preventing damage to the extrusion mold and ensuring long-term use.
更に、上記第２デルタ形領域１９の長さを長く成型する
ことにより、ねじ込みに際し、正常なねじ山によりスム
ースに移行させることが可能となる。Furthermore, by molding the second delta-shaped region 19 to a long length, it becomes possible to smoothly transfer the screw thread using a normal thread.
総じて、本発明によればねじ込みトルクが小さく、しか
もねじ込み後は充分なる保持力が得られるのみならず、
取り扱いやすく、しかも金型に無理のかからない形状と
した等数々の利点を有する自己タップフォーミングねじ
を提供することができる。Overall, according to the present invention, not only the screwing torque is small and sufficient holding force is obtained after screwing, but also
It is possible to provide a self-tapping forming screw which has a number of advantages, such as being easy to handle and having a shape that does not put strain on the mold.
尚説明中「ねじ刻設」とはねじ塑性加工、即ちねじフォ
ーミング成型を意味する。In the description, "thread carving" means thread plastic working, that is, thread forming molding.
第１図は従来のねじ転造前の素材形状を示す側面図、第
２図は同平面図、第３図は同ねじ素材に成型した平面部
の拡大側面図、第４図は従来の誘導雄ねじ山部と正常雄
ねじ山部の形成状態を示す拡大側面図、第５図は本発明
のねじ転造前の素材形状を示す側面図、第６図は同平面
図、第７図Ａは第５図Ｃ−Ｃ線の、第７図Ｂは第５図Ｃ
−Ｃ線の、第７図Ｃは第５図Ｃ−Ｃ線の、第７図りは第
５図Ｃ−Ｃ線の、第７図Ｅは第５図Ｃ−Ｃ線の断面図、
第８図は本発明の転造後の形状を示す側面図、第９図は
同平面図、第１０図Ａは第８図Ｃ−Ｃ線の、第１０図Ｂ
は第８図Ｃ−Ｃ線の、第１０図Ｃは第８図Ｃ−Ｃ線の、
第１０図りは第８図Ｃ−Ｃ線の、第１０図Ｅは第８図Ｃ
−Ｃ線の断面図、第１１図は本発明によるねじ転造によ
って得られたねじの拡大側面図、第１２図は本発明のね
じ素材加工に使用する金型の断面図である。
１１・・・ねじ素材の軸杆、１４・・・軸杆の先端部に
成型した截頭円錐形軸部、１５・・・截頭円錐形軸部先
端部に成型した雌ねじ刻設穴に対するねじ込み前におけ
る挿入ガイド用の截頭円錐形軸端部、１６・・・ねじ素
材の軸心線に平行にテーパ部から軸杆にかけて成型した
平面部、１７．１９・・・平面部の両端に成型した軸杆
と同心円にして先細状の第１、第２デルタ領域部、２１
・・・第１予備雌ねじ刻設用雄ねじ出、２２・・・第２
予備雌ねじ刻設用雄ねじ山、２２′・・・第３予備雌ね
じ刻設用雄ねじ山、２３・・・正常な雄ねじ山、２４・
・・第１誘導雄ねじ山、２５・・・第２誘導雄ねじ山、
２６・・・第３誘導雄ねじ出。Fig. 1 is a side view showing the shape of the material before conventional thread rolling, Fig. 2 is a plan view of the same, Fig. 3 is an enlarged side view of a flat part formed on the same thread material, and Fig. 4 is a conventional guide. FIG. 5 is a side view showing the shape of the material before thread rolling according to the present invention; FIG. 6 is a plan view of the same; FIG. Figure 5 C-C line, Figure 7 B is Figure 5 C
7C is a cross-sectional view of the line C-C in FIG.
Fig. 8 is a side view showing the shape of the present invention after rolling, Fig. 9 is a plan view of the same, Fig. 10A is taken along line C-C in Fig. 8, and Fig. 10B is
is the line C-C in Figure 8, and C in Figure 10 is the line C-C in Figure 8.
Figure 10 is line C-C in Figure 8, Figure 10 E is line C in Figure 8.
-C line, FIG. 11 is an enlarged side view of a screw obtained by thread rolling according to the present invention, and FIG. 12 is a cross-sectional view of a mold used for processing the screw material according to the present invention. 11...A shaft made of threaded material, 14...A truncated conical shaft formed at the tip of the shaft, 15...Screwed into a female threaded hole formed at the tip of a truncated conical shaft. A truncated conical shaft end for an insertion guide in the front, 16...A flat part molded from the taper part to the shaft rod parallel to the axis of the screw material, 17.19... Molded at both ends of the flat part. first and second delta regions concentric with the shaft rod and tapered; 21;
... 1st preliminary female thread carving male screw out, 22... 2nd
Male thread for carving a spare female thread, 22'... Male thread for carving a third spare female thread, 23... Normal male thread, 24.
... 1st lead male thread, 25... 2nd lead male thread,
26...Third lead male screw out.
Claims (1)
頭円錐形軸部とからなるねじ素材において。 截頭円錐形軸部先端部に所要長さの截頭円錐形軸端部を
残留させ、この截頭円錐形軸端部上位より上記円柱形軸
部の二部に及ぶ領域に円周方向に等間隔で且つ、ねじ素
材の軸心線に平行に３個の平面部を成型し、この平面部
の成型によって、上記截頭円錐形軸部の先端部に上記平
面部が成型されない截頭円錐形軸端部を成型すると共に
、上記平面部の円柱形軸部における成型端辺に円周方向
に弧面で且つ先細状のデルタ領域を成型し、次いで、ね
じ素材の截頭円錐形軸端部を残留した截頭円錐形軸部及
び円柱形軸部の全域に雄ねじ山を転造し、この転造によ
って、上記デルタ領域に円周方向の巾を一定にし、且つ
正常の雄ねじ山に近づくに従って除々に浅くなるスプー
ン状欠落部となるように成型したことを特徴とする自己
タップフォーミングねじの成型法。[Scope of Claims] 1. A screw material comprising a cylindrical shaft portion and a tapered truncated conical shaft portion at the tip of the cylindrical shaft portion. A truncated conical shaft end portion of a required length is left at the tip of the truncated conical shaft portion, and a section extending from above the truncated conical shaft end to an area extending over two parts of the cylindrical shaft portion in the circumferential direction. A truncated cone in which three flat parts are molded at equal intervals and parallel to the axis of the thread material, and the flat parts are not molded on the tip of the truncated conical shaft part by molding the flat parts. At the same time as molding the shaped shaft end, a delta region having an arcuate and tapered shape in the circumferential direction is molded on the molded end of the cylindrical shaft of the flat part, and then a frusto-conical shaft end of the screw material is molded. A male screw thread is rolled in the entire area of the truncated conical shaft portion and the cylindrical shaft portion where the portion remains, and by this rolling, the width in the circumferential direction is made constant in the delta area and approaches a normal male screw thread. A method for forming a self-tap forming screw, characterized in that the screw is formed into a spoon-shaped missing portion that gradually becomes shallower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14742780A JPS5920410B2 (en) | 1980-10-21 | 1980-10-21 | Forming method for self-tap forming screws |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14742780A JPS5920410B2 (en) | 1980-10-21 | 1980-10-21 | Forming method for self-tap forming screws |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5770047A JPS5770047A (en) | 1982-04-30 |
| JPS5920410B2 true JPS5920410B2 (en) | 1984-05-12 |
Family
ID=15430064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14742780A Expired JPS5920410B2 (en) | 1980-10-21 | 1980-10-21 | Forming method for self-tap forming screws |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5920410B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008095773A (en) * | 2006-10-10 | 2008-04-24 | Topura Co Ltd | Tapping screw |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2702689B1 (en) * | 1993-03-17 | 1995-06-16 | Former | Ogival end screw and process for obtaining it. |
-
1980
- 1980-10-21 JP JP14742780A patent/JPS5920410B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008095773A (en) * | 2006-10-10 | 2008-04-24 | Topura Co Ltd | Tapping screw |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5770047A (en) | 1982-04-30 |
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