JP2016097430A - Helical gear and helical gear manufacturing method - Google Patents
Helical gear and helical gear manufacturing method Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
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Abstract
Description
本発明は、ヘリカルギヤ及びその製造方法に関し、特に、鍛造加工による、高精度なヘリカルギヤの製造方法に関するものである。 The present invention relates to a helical gear and a manufacturing method thereof, and more particularly to a highly accurate manufacturing method of a helical gear by forging.
従来、ヘリカルギヤの製造方法としては、円柱素材をギヤ形状を有する金型に挿入し、加圧、塑性流動させギヤを成形する方法がある。 Conventionally, as a method for manufacturing a helical gear, there is a method in which a cylindrical material is inserted into a mold having a gear shape, and a gear is formed by pressurization and plastic flow.
具体的な例としては、特開２００２−７９３４９号公報のように、円柱素材の軸部と、軸部外径を絞るためのテーパ部が設けられその先端にギヤが成形されている。 As a specific example, as disclosed in JP-A-2002-79349, a shaft portion of a cylindrical material and a taper portion for reducing the outer diameter of the shaft portion are provided, and a gear is formed at the tip thereof.
ヘリカルギヤにおいては、コスト低減を目的に鍛造により製造されている。円周状のダイスに素材を挿入に、軸線方向に加圧することにより、ヘリカルギヤを鍛造加工することが周知である。 Helical gears are manufactured by forging for the purpose of cost reduction. It is well known to forge a helical gear by inserting a material into a circumferential die and applying pressure in the axial direction.
この製造方法のヘリカルギヤ１００は、図７に示すように、円周状を成すとともに外周面にねじれ角を有するヘリカル歯１０１を備え、そのヘリカル歯１０１の一端面側にテーパ面１０２を介して円周状の軸部１０３が形成された構造である。 As shown in FIG. 7, the helical gear 100 of this manufacturing method includes a helical tooth 101 having a circumferential shape and having a torsion angle on the outer peripheral surface, and a circular surface via a tapered surface 102 on one end surface side of the helical tooth 101. This is a structure in which a circumferential shaft portion 103 is formed.
これらのヘリカルギヤを精度よく製造するための手段として、ヘリカル歯を成形するダイスの入口形状、テーパ形状について、さまざまな提案がされている。しかしながらヘリカル歯成形のために材料を絞り込むために、軸部１０３とヘリカル歯１０１の間にテーパ部１０２を備えることが必要であり、これによりヘリカルギヤ全体が長くなるという問題がある。 As means for manufacturing these helical gears with high accuracy, various proposals have been made regarding the inlet shape and tapered shape of a die for forming helical teeth. However, in order to narrow down the material for forming the helical tooth, it is necessary to provide the tapered portion 102 between the shaft portion 103 and the helical tooth 101, which causes a problem that the entire helical gear becomes long.
このように、従来技術では、円柱軸部と軸部外径を絞る方向に傾斜したテーパ部１０２を有しており、ヘリカルギヤ全体の寸法が大きくなり、更に、軸部１０３の外径はヘリカル歯１０１に対し、大きな寸法とする必要があったため、小型化が困難であった。 Thus, in the prior art, the cylindrical shaft portion and the tapered portion 102 inclined in the direction of reducing the outer diameter of the shaft portion are provided, the overall size of the helical gear is increased, and the outer diameter of the shaft portion 103 is helically toothed. Since it was necessary to make the dimensions larger than 101, it was difficult to reduce the size.
また、このような製造方法では、ヘリカル歯の初期段階の成形過程では、図８に示すように、先端部の材料１０４は自由伸び状態で、加圧方向Ｐ１と材料の流動方向Ｐ２が直線的ではないため、未充填部１０５が発生し、所定のギヤ精度が得られない問題がある。このため実使用の際には、先端の未充填部を切削などで除去する必要があり、コスト高の要因となる。 Further, in such a manufacturing method, in the forming process of the initial stage of the helical tooth, as shown in FIG. Therefore, there is a problem that the unfilled portion 105 is generated and a predetermined gear accuracy cannot be obtained. For this reason, in actual use, it is necessary to remove the unfilled portion at the tip by cutting or the like, which causes a high cost.
さらに、ヘリカルギヤの鍛造による製造方法においては、ねじれ角の大きなヘリカルギヤの製造の場合、ギヤ精度の確保が困難であり、また、金型寿命が著しく低下するなどの問題がある。鍛造による製造方法では、ねじれ角が２０°程度が限界とされている。 Furthermore, in the manufacturing method by forging a helical gear, when manufacturing a helical gear having a large torsion angle, it is difficult to ensure gear accuracy, and the die life is significantly reduced. In the manufacturing method by forging, the limit of the twist angle is about 20 °.
ヘリカル歯の成形では、素材の加圧方向と、ヘリカル歯の変形方向は、ねじれ角を有するために直線的にならない。このため、材料の塑性流動が複雑となり、捩り変形や、残留応力などのために、ギヤ精度の確保は困難となる。更に、ヘリカル歯型の導入部には大きな曲げ応力Ｍが発生するため、金型寿命が短いなどの問題がある。 In the formation of helical teeth, the pressing direction of the material and the deformation direction of the helical teeth are not linear because they have a twist angle. This complicates the plastic flow of the material and makes it difficult to ensure gear accuracy due to torsional deformation and residual stress. Furthermore, since a large bending stress M is generated in the introduction portion of the helical tooth mold, there is a problem that the mold life is short.
本発明の目的は、上記問題点を解決するために、高精度にギヤを成形し、金型寿命の低下を起こさず、更に、ヘリカルギヤの小型化を可能にする製造方法を提供することにある。 In order to solve the above problems, an object of the present invention is to provide a manufacturing method capable of forming a gear with high accuracy, not causing a decrease in mold life, and further reducing the size of the helical gear. .
上記目的を達成するために、本発明に係るヘリカルギアは、円柱状の軸部の先端に複数条形成されたヘリカル歯を備えるヘリカルギヤにおいて、軸部にヘリカル歯に相対する複数条の予備成形部を備えたことにより、テーパ部を設置する必要がなく、ヘリカルギヤの全体を短くできる。 In order to achieve the above object, a helical gear according to the present invention includes a helical gear having a plurality of helical teeth formed at the tip of a cylindrical shaft portion, and a plurality of preformed portions facing the helical teeth on the shaft portion. Since it is not necessary to install a taper part, the whole helical gear can be shortened.
また本発明に係るヘリカルギアは、予備成形部をヘリカル歯のねじれ角とほぼ同じ角度で形成することにより、ヘリカル歯成形の際の塑性流動をスムーズかつ均一にできるため、捩れ変形、不均一な残留応力の発生を抑制することができ、高精度なヘリカルギヤを得ることができる。 Further, the helical gear according to the present invention can form a preformed portion at substantially the same angle as the helical tooth twist angle, thereby making the plastic flow smooth and uniform during the helical tooth molding. Generation of residual stress can be suppressed, and a highly accurate helical gear can be obtained.
また本発明に係るヘリカルギアは、予備成形部とヘリカル歯を連続的に成形することで、塑性流動は連続的に起こり、捩れ変形、不均一な残留応力の発生を抑制することができ、高精度なヘリカルギヤを得ることができる。 In addition, the helical gear according to the present invention continuously forms the preformed portion and the helical teeth, so that the plastic flow occurs continuously, and the generation of torsional deformation and uneven residual stress can be suppressed. An accurate helical gear can be obtained.
また本発明に係るヘリカルギアは、予備成形部とヘリカル歯はほぼ同一外径とすることで、ヘリカルギヤの小型、軽量化を図ることができる。 In the helical gear according to the present invention, the preformed portion and the helical teeth have substantially the same outer diameter, so that the helical gear can be reduced in size and weight.
また本発明に係るヘリカルギアは、円柱状の軸部と予備成形部とヘリカル歯はほぼ同一外径とすることで、請求項４に対し一層の小型、軽量化図ることができる。 In the helical gear according to the present invention, the cylindrical shaft portion, the preformed portion, and the helical teeth have substantially the same outer diameter, so that further reduction in size and weight can be achieved.
また本発明に係るヘリカルギアの製造方法は、円柱状の軸部の先端に複数条形成されたヘリカル歯を備えるヘリカルギヤの製造方法において、鍛造加工により、軸部途中までヘリカル歯に相対する予備成形部を成形した後に、ヘリカル歯を成形する製造方法とすることで、低コストでヘリカルギヤを製造することができる。 The helical gear manufacturing method according to the present invention is a method for manufacturing a helical gear having a plurality of helical teeth formed at the tip of a cylindrical shaft portion. In the manufacturing method of the helical gear, a preforming process is performed by forging to face the helical teeth halfway through the shaft portion. A helical gear can be manufactured at low cost by adopting a manufacturing method for forming helical teeth after forming the portion.
また本発明に係るヘリカルギアの製造方法は、第一の金型で予備成形部を成形した中間成形品を製作した後、第二の金型でヘリカル歯を成形する製造方法としたことで、金型構造は簡略化でき、低コストでヘリカルギヤを製造することができる。 In addition, the manufacturing method of the helical gear according to the present invention is a manufacturing method in which a helical tooth is molded with a second mold after manufacturing an intermediate molded product in which a preformed portion is molded with the first mold. The mold structure can be simplified and the helical gear can be manufactured at low cost.
また本発明に係るヘリカルギアの製造方法は、第二の金型には予備成形部の形状の相対した、ガイド部が備えられ、ガイド部に沿って中間成形品を挿入し、ガイド部に案内されながらヘリカル歯を成形する製造方法としたことで、簡便に中間成形品をガイドしながら製造することができ、低コストで高精度なヘリカルギヤを製造することができる。 In the helical gear manufacturing method according to the present invention, the second mold is provided with a guide portion having a shape corresponding to the shape of the preformed portion, and an intermediate molded product is inserted along the guide portion and guided to the guide portion. However, by adopting a manufacturing method for forming helical teeth, it is possible to manufacture while simply guiding the intermediate molded product, and it is possible to manufacture a highly accurate helical gear at low cost.
また本発明に係るヘリカルギアの製造方法は、予備成形とヘリカル歯成形の金型は同一金型に備えられ、同一金型により連続的に成形される製造方法としたことで、生産性が良く、低コストで高精度なヘリカルギヤを製造することができる。 In addition, the helical gear manufacturing method according to the present invention has a high productivity because the preforming mold and the helical tooth forming mold are provided in the same mold and are continuously molded by the same mold. It is possible to manufacture a highly accurate helical gear at low cost.
本発明により、ねじれ角が大きいヘリカルギヤにおいても、材料の塑性流動がスムーズとなるため、ギヤ精度が向上し、金型寿命の低下を防ぐことができ、さらに、ヘリカルギヤの小型化が可能となる。 According to the present invention, even in a helical gear having a large torsion angle, the plastic flow of the material becomes smooth. Therefore, the gear accuracy can be improved, the life of the mold can be prevented from being reduced, and the helical gear can be miniaturized.
以下に、本発明の実施の形態を図面を用いて説明する。 Embodiments of the present invention will be described below with reference to the drawings.
図１に本発明の一実施例のヘリカルギヤの外観を示す。本実施例は、自動車用ステアリングに用いられるヘリカルギヤ１である。ヘリカルギヤ１は、円柱状の軸部２と予備成形部３、ヘリカル歯４とを備え、ねじれ角はαである。 FIG. 1 shows the appearance of a helical gear according to an embodiment of the present invention. A present Example is the helical gear 1 used for the steering for motor vehicles. The helical gear 1 includes a cylindrical shaft portion 2, a preforming portion 3, and helical teeth 4, and the twist angle is α.
図２はヘリカルギヤ１の断面を示した図であり、ＡＡは軸部２のＡ−Ａ断面である。ＢＢは予備成形部３のＢ−Ｂ断面、ＣＣはヘリカル歯４のＣ−Ｃ断面である。予備成形部３は、角部３ａと平坦部３ｂで形成された多角形形状であり、ねじれ角は、ヘリカル歯４のねじれ角とほぼ同じ角度である。また、本実施例では、軸部２の外径φＤ０と予備成形部３の外径φＤ１とヘリカル歯４の外径φＤ２は、ほぼ同一外径としている。 FIG. 2 is a view showing a cross section of the helical gear 1, and AA is an AA cross section of the shaft portion 2. BB is a BB cross section of the preformed portion 3, and CC is a CC cross section of the helical tooth 4. The preformed portion 3 has a polygonal shape formed by the corner portion 3 a and the flat portion 3 b, and the twist angle is substantially the same as the twist angle of the helical tooth 4. In the present embodiment, the outer diameter φD0 of the shaft portion 2, the outer diameter φD1 of the preforming portion 3, and the outer diameter φD2 of the helical teeth 4 are substantially the same outer diameter.
図３に本実施例のヘリカルギヤ１を成形する金型構造を示す。本金型構造は、予備成形部３とヘリカル歯４を一つの金型で連続的成形できるものである。金型５は、予備成形ダイス６とヘリカル歯成形ダイス７、パンチ８で構成される。予備成形ダイス６には、予備成形部３の形状に相対する形状の予備歯型６ａが内径に形成されている。ヘリカル歯成形ダイス７には、ヘリカル歯４の形状に相対する形状のヘリカル歯型７ａが内径に形成されている。 FIG. 3 shows a mold structure for molding the helical gear 1 of this embodiment. In this mold structure, the preforming portion 3 and the helical teeth 4 can be continuously molded with a single mold. The mold 5 includes a preforming die 6, a helical tooth forming die 7, and a punch 8. The preforming die 6 is formed with a preformed tooth die 6 a having a shape opposite to the shape of the preformed portion 3 on the inner diameter. The helical tooth forming die 7 is formed with a helical tooth mold 7 a having a shape opposite to the shape of the helical tooth 4 on the inner diameter.
以下、詳細工程を説明する。本実施例の一工程例を図４に示す。 Hereinafter, a detailed process will be described. One process example of this embodiment is shown in FIG.
円柱状素材９は、所定の長さに加工された後、ボンデ処理など適切な潤滑処理が施される。潤滑処理後、円柱素材９は、図３に示された金型５に挿入される。図示しない加圧装置によりパンチ８は下降し円柱素材９を加圧する。パンチ８の加圧により、円柱素材９は、予備成形ダイス６に備えられた予備歯型６ａにより予備成形部３が形成され始める。その際、予備成形された円柱素材９は、予備成形ダイス６をねじれ角αに沿って、回転しながら成形される。予備成形部３が所定の長さ形成されると、予備成形された円柱素材９の先端部３ｃがヘリカル歯成形ダイス７に連続的に挿入され、ヘリカル歯４が形成され始める。この時、円柱素材９は予備成形により回転させられているため、ねじれ角αを持つヘリカル歯型７ａに直線的に挿入される。パンチ８の下降により所定の長さのヘリカル歯４が形成され、ヘリカルギヤ１が製造される。その後、図示しないエジェクト装置により、ヘリカルギヤ１は金型５から取り出される。 The cylindrical material 9 is processed to a predetermined length and then subjected to an appropriate lubrication process such as a bond process. After the lubrication process, the columnar material 9 is inserted into the mold 5 shown in FIG. The punch 8 is lowered by a pressure device (not shown) to pressurize the columnar material 9. Due to the pressurization of the punch 8, the preforming portion 3 of the cylindrical material 9 starts to be formed by the preliminary tooth mold 6 a provided in the preliminary molding die 6. At that time, the preformed cylindrical material 9 is formed while rotating the preforming die 6 along the twist angle α. When the preforming portion 3 is formed to a predetermined length, the tip portion 3c of the preformed cylindrical material 9 is continuously inserted into the helical tooth forming die 7, and the helical teeth 4 begin to be formed. At this time, since the columnar material 9 is rotated by preforming, it is linearly inserted into the helical tooth mold 7a having the twist angle α. When the punch 8 is lowered, the helical teeth 4 having a predetermined length are formed, and the helical gear 1 is manufactured. Thereafter, the helical gear 1 is taken out from the mold 5 by an unillustrated ejecting device.
上述したように、円柱素材９は、ヘリカル歯４が形成される時には、ねじれ角αに沿って回転させられ、ヘリカル歯型７ａに直線的に挿入される。このため、材料はスムーズにヘリカル歯型７ａに塑性流動することができ、均一な塑性流動状態となり、従来問題であった先端部の未充填部の発生を抑制し、残留応力による捩り変形が解消され、高精度なギヤを得ることができる。さらに、金型に発生する応力も、ねじり角にそって直線的に材料が流動するため、曲げモーメントの発生を抑制し、金型寿命の向上を図ることができる。
特に、ねじれ角が大きいヘリカルギヤにおいては、この効果が大きく、これまで、ねじれ角２０°程度が限界と言われているが、本実施形態の製造方法により、ねじれ角２０°以上のヘリカルギヤの成形を可能にできた。
As described above, when the helical tooth 4 is formed, the columnar material 9 is rotated along the twist angle α and is linearly inserted into the helical tooth mold 7a. For this reason, the material can smoothly plastically flow into the helical tooth mold 7a, and it becomes a uniform plastic flow state, suppressing the occurrence of unfilled portions at the tip portion, which has been a problem in the past, and eliminating torsional deformation due to residual stress. Thus, a highly accurate gear can be obtained. Furthermore, since the material flows linearly along the torsion angle, the stress generated in the mold can suppress the generation of a bending moment and improve the mold life.
In particular, this effect is great in a helical gear with a large helix angle. Until now, it has been said that a helix angle of about 20 ° is the limit. However, by the manufacturing method of this embodiment, a helical gear with a helix angle of 20 ° or more can be formed. I made it possible.
本実施形態を採用したヘリカルギヤの仕様を図５に示す。モジュール２．０、歯数７、ねじれ角３２．２１°、材質はＳ４５Ｃである。予備成形部３は、歯数７に対応し、ねじれ角３２．２１°の正７角形の形状とした。従来方式によれば、ヘリカル歯４の先端部の未充填発生によるダレ形状が約６ｍｍ程度発生したが、発明方式によれば、先端部のダレは４ｍｍ以下と少なくすることができ、高精度ギヤを得ることができた。 The specification of the helical gear which employ | adopted this embodiment is shown in FIG. Module 2.0, number of teeth 7, twist angle 32.21 °, material is S45C. The preforming portion 3 has a regular heptagon shape corresponding to the number of teeth 7 and a twist angle of 32.21 °. According to the conventional method, the sagging shape due to the unfilled occurrence of the tip portion of the helical tooth 4 occurs about 6 mm, but according to the invention method, the sagging of the tip portion can be reduced to 4 mm or less, and a high-precision gear Could get.
本実施例では、予備成形部３は正７角形としたが、図６に示すような、曲面形状、概略ギヤ形状としても良い。但し、金型製作コストなどを考慮すれば、多角形形状が優位である。 In the present embodiment, the preforming portion 3 is a regular heptagon, but it may have a curved surface shape or a general gear shape as shown in FIG. However, the polygonal shape is superior when the mold manufacturing cost is taken into consideration.
また、上記実施例では、予備成形とヘリカル歯成形を同一金型５で連続的に成形した例であるが、第一の金型で予備成形を行い金型から取出した後、第二の金型でヘリカル歯を成形する工程とすることも可能である。この場合、予備成形部３の形状をガイドできるような案内形状をヘリカル歯型ダイス７の内径部に、設置することが必要となる。この案内形状により、予備成形された円柱素材９は、前述実施例と同様に、回転しながらヘリカル歯型７ａでヘリカル歯４が成形され、同様の効果を得ることができる。第一の金型、第二の金型を使用するこの方式によれば、工程を分割できるので、成形に必要な荷重を低減できるため、大きな能力を持つ加圧装置を使用しないで成形することができる。 Moreover, in the said Example, although it is an example which preformed and helical tooth shaping | molding continuously by the same metal mold | die 5, after preforming with a 1st metal mold and taking out from a metal mold | die, a 2nd metal mold | die is carried out. It is possible to form a helical tooth with a mold. In this case, it is necessary to install a guide shape capable of guiding the shape of the preforming portion 3 on the inner diameter portion of the helical tooth die 7. Due to this guide shape, the preformed cylindrical blank 9 is shaped so that the helical teeth 4 are formed by the helical tooth mold 7a while rotating, as in the previous embodiment, and the same effect can be obtained. According to this method using the first mold and the second mold, the process can be divided, so the load required for molding can be reduced, so molding without using a pressurizing device with large capacity Can do.
また、本実施形態のヘリカルギヤは、従来技術で必要であった、絞り方向に傾斜したテーパ部を除くことができ、さらに素材外径寸法の縮小化を図ることができ、ヘリカルギヤ自体の小型化、軽量化が可能となる。さらに、金型寿命の向上が図れるため、製造コストの低減を図ることができる。 Further, the helical gear of the present embodiment can remove the tapered portion inclined in the drawing direction, which is necessary in the prior art, and can further reduce the outer diameter of the material, downsizing the helical gear itself, Weight reduction is possible. Further, since the mold life can be improved, the manufacturing cost can be reduced.
また、本実施例では、円柱素材９は中実形状としているが、中空形状の素材の採用も可能であり、この場合は、一層の軽量化を図ることができる。 In this embodiment, the columnar material 9 has a solid shape, but a hollow material can also be used. In this case, further weight reduction can be achieved.
１…ヘリカルギヤ、２…軸部、３…予備成形部、４…ヘリカル歯、５…金型、６…予備成形ダイス、７…ヘリカル歯成形ダイス、８…パンチ、９…円柱状素材、１００…ヘリカルギヤ、１０１…ヘリカル歯、１０２…テーパ面、１０３…軸部、１０４…材料、１０５…未充填部、Ｐ１…加圧方向、Ｐ２…流動方向 DESCRIPTION OF SYMBOLS 1 ... Helical gear, 2 ... Shaft part, 3 ... Preliminary molding part, 4 ... Helical tooth, 5 ... Die, 6 ... Pre-molding die, 7 ... Helical tooth molding die, 8 ... Punch, 9 ... Cylindrical material, 100 ... Helical gear, 101 ... helical teeth, 102 ... tapered surface, 103 ... shaft portion, 104 ... material, 105 ... unfilled portion, P1 ... pressure direction, P2 ... flow direction
Claims (9)
前記軸部に前記ヘリカル歯に相対する複数条の予備成形部を備えるヘリカルギヤ。 In the helical gear provided with a plurality of helical teeth formed at the tip of the cylindrical shaft part,
A helical gear comprising a plurality of pre-formed portions opposed to the helical teeth on the shaft portion.
前記予備成形部は、前記ヘリカル歯のねじれ角とほぼ同じ角度で成形されるヘリカルギヤ。 The helical gear according to claim 1,
The pre-formed part is a helical gear formed at an angle substantially the same as the helical angle of the helical teeth.
前記予備成形部は、前記ヘリカル歯に対して続的に成形されるヘリカルギヤ。 The helical gear according to claim 1 or 2,
The preforming portion is a helical gear that is continuously formed with respect to the helical teeth.
前記予備成形部の外径と前記ヘリカル歯の外径は、ほぼ同一であるヘリカルギヤ。 The helical gear according to any one of claims 1 to 3,
A helical gear in which the outer diameter of the preformed portion and the outer diameter of the helical tooth are substantially the same.
前記軸部の外径は、前記予備成形部の外径と前記ヘリカル歯の外径とほぼ同一であるヘリカルギヤ。 The helical gear according to claim 4,
A helical gear in which the outer diameter of the shaft portion is substantially the same as the outer diameter of the preformed portion and the outer diameter of the helical teeth.
鍛造加工により、軸部途中までヘリカル歯に相対する予備成形部を成形した後に、前記ヘリカル歯を成形するヘリカルギヤの製造方法。 In a manufacturing method of a helical gear provided with a plurality of helical teeth formed at the tip of a cylindrical shaft portion,
A method for manufacturing a helical gear, in which after forming a preformed portion facing the helical tooth partway through a shaft by forging, the helical tooth is formed.
第一の金型で前記予備成形部を成形した中間成形品を製作した後、第二の金型で前記ヘリカル歯を成形するヘリカルギヤの製造方法。 It is a manufacturing method of the helical gear of Claim 6,
A manufacturing method of a helical gear in which an intermediate molded product in which the preformed portion is molded with a first mold is manufactured, and then the helical teeth are molded with a second mold.
前記第二の金型には前記予備成形部の形状の相対したガイド部が設けられ、
前記ガイド部に沿って中間成形品を挿入し、前記ガイド部に案内されながら前記ヘリカル歯を成形するヘリカルギヤの製造方法。 It is a manufacturing method of the helical gear of Claim 7,
The second mold is provided with a guide portion opposed to the shape of the preforming portion,
The manufacturing method of the helical gear which inserts an intermediate molded product along the said guide part, and shape | molds the said helical tooth, being guided by the said guide part.
予備成形とヘリカル歯成形の金型は同一金型に備えられ、同一金型により連続的に成形されるヘリカルギヤの製造方法。 It is a manufacturing method of the helical gear of Claim 6,
The manufacturing method of the helical gear by which the metal mold | die of a preforming and a helical tooth shaping | molding is provided in the same metal mold | die, and is shape | molded continuously by the same metal mold | die.
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