200916222 九、發明說明: 【發明所屬之技術領域】 螺絲軸製造方法 本發明係關於-種製造祕自_駆動部旋轉轴等之 姆溝螺絲軸的轉造牙輪與附有細徑半徑r圓底深溝之轉造 【先前技術】 ✓200916222 IX. Description of the invention: [Technical field of the invention] Screw shaft manufacturing method The present invention relates to a turning cone for manufacturing a threaded screw shaft of a rotating shaft or the like, and a radius of a radius r The conversion of the deep trench [previous technology] ✓
以轉造方式製造螺桿為一般常用的方法，藉由旋轉方式 造出滾珠螺m桿製造方法（參考糊文獻 33841號公報），或是以低廉的價格轉造出高性能牙^ 牙輪與其製造方法（參考專利文獻2，特開讀—期仍號公 報）等已被公開；使用—對牙輪，在兩者間插人螺桿胚料進行 轉造。如此轉造方式是最—般的，進行螺絲溝加工時，只要 -次加，既y完成，是最大的特點及優點，與研削加工轴相較 之下，具里産性因此可大幅降低成本，成為低價的螺桿製造 方式。 此轉造方式可以依所希望的牙絲配置可瞒的二個轉 造牙輪，在這之間插入圓棒，以轉造牙輪之連續錐形鋸齒在圓 棒表面形成_溝，其為_溝之製造方法，糊棒的轴線方 向’將二個些微傾斜的轉造牙輪以财向旋轉，圓棒也相對地 使其旋轉，形成螺絲溝，並且會自動向圓棒的軸線方向移動。 圓棒的袖線方向與轉造牙輪的鉸合部有01傾斜角，依照 傾斜角的;Μ、’依序崎獅深度之轉造牙輪，可減低在進行 轉造時的抗力。 此外，插入圓棒之後，從圓棒端部開始依序形成螺絲溝， 5 200916222 此時以轉造所形成的螺絲溝會愈來愈深，轉造牙輪加壓所產生 的塑性變形量會增加，牙輪與圓棒之間發生的轉動抗力會增 大，轉動抗力增大後，開始加工時會在轉造裝置側發生激烈的 負荷變動，而且在開始加工時圓棒的維持力會因為轉動抗力的 增大而不安定，因此溝槽精度以及真圓度會發生誤差特別是 細徑軸的表面可能會產生剝離或歪曲等問題，此外轉造牙輪因 為有銳角邊部分’其銳角邊部分會產生集中應力，造成圓棒轴 的破損或影響螺絲溝的形狀或精度等問題。 【發明内容】 。本發明之一目的在於提供一種轉造牙輪與附有細徑半徑r 圓底深溝之轉造螺雜製造方法，製造祕自動門駆動部旋轉 軸等之細徑深溝螺絲軸的轉造牙輪與附有細徑半徑R圓底深 溝之轉造螺絲軸製造方法。 為 。本發明之一目的在於提供一種轉造牙輪與附有細徑半徑r 圓底深溝之轉造螺絲軸製造方法，為對於在轉造牙輪的表面呈 錐形之螺躲髓導程肖’以直角_的鋪剖轉狀呈現為 半徑R之半圓狀，此轉造牙輪表面與前述半圓狀鋸齒之間以半 徑r取其，從㈣勤形絲看，其表面形狀與此轉造牙 輪之中心軸線呈01驗合角度之錢合部，以及其表面形狀與 轉造牙輪的中心軸線呈平行部分之平行直線部，還有其表面形 狀與轉造牙輪的中心軸線呈Μ_開角度之離開部分，轉造 牙輪由此三特徵所構成，前述螺旋狀錫齒兩端之鉸合部端部與 離開部端部的銳角邊呈圓角狀為其特徵。 。一 本發明之-目的在於提供—㈣造牙輪_有細徑半徑r 6 200916222 轉造牙輪表=絲軸製造方法，是在螺旋狀_的兩端，以 使其成為相部形成㈣狀為其·。將此銳角邊 形成應力隼巾^ ，包含了在製造帽於製品決不會 果中的4分，以及不會發生損傷。 号务日月之_ rqA method for manufacturing a screw by a transfer method is a commonly used method, and a ball screw m rod manufacturing method is produced by a rotary method (refer to Japanese Patent Laid-Open No. 33841), or a high-performance toothed cone is manufactured at a low price and manufactured. The method (refer to Patent Document 2, Japanese Patent Application Laid-Open No.) and the like has been disclosed; the use of a pair of cones is carried out by inserting a screw blank between the two. This type of conversion is the most common. When the screw groove is processed, as long as it is added, the y is completed, which is the biggest feature and advantage. Compared with the grinding machine shaft, it has a high productivity and can greatly reduce the cost. It has become a low-cost screw manufacturing method. The conversion method can be configured according to the desired arbitrarily arranged two rotating cones, and a round bar is inserted between the two, so that the continuous tapered serration of the rotating cone forms a groove on the surface of the round bar, which is _ The manufacturing method of the groove, the axial direction of the paste stick 'rotates the two slightly inclined turning cones in the fiscal direction, and the round rods also rotate relative to each other to form a screw groove, and automatically rotate toward the axis of the round rod mobile. The direction of the sleeve of the round bar and the hinge of the turning cone have a tilt angle of 01, according to the angle of inclination; Μ, ‘, in order to change the depth of the snail, it can reduce the resistance during the transformation. In addition, after the round bar is inserted, the screw groove is sequentially formed from the end of the round bar, 5 200916222, the screw groove formed by the conversion will become deeper and deeper, and the plastic deformation caused by the rotation of the rotating cone will be Increasing, the rotational resistance that occurs between the cone and the round bar increases, and when the rotational resistance increases, a severe load change occurs on the side of the conversion device when the machining starts, and the maintenance force of the round bar at the start of processing is due to The increase of the rotational resistance is not stable, so the groove accuracy and the roundness may be inaccurate, especially the surface of the small-diameter shaft may be peeled or distorted, and the transfer cone has an acute-angled portion Some of them will cause concentrated stress, causing damage to the round shaft or affecting the shape or accuracy of the screw groove. SUMMARY OF THE INVENTION An object of the present invention is to provide a manufacturing method for manufacturing a turning cone and a rotating thread with a small radius r round bottom groove, and manufacturing a small diameter deep groove screw shaft of the automatic door swinging portion and the like. And a manufacturing method for a rotary screw shaft with a deep groove with a small diameter R and a round bottom. For . SUMMARY OF THE INVENTION One object of the present invention is to provide a method for manufacturing a turning cone and a rotating screw shaft with a small radius and a round bottom groove, which is a conical snail guide for the surface of the rotating cone. It is represented by a semi-circular shape with a radius R of a right angle _, and the surface of the turning cone and the semicircular sawtooth are taken at a radius r, and the surface shape and the tooth are changed from the (4) diligent wire. The central axis of the wheel is a cross-section of the 01-engagement angle, and a parallel straight line whose surface shape is parallel to the central axis of the transfer cone, and the surface shape of which is the same as the central axis of the transfer cone. The exiting portion of the opening angle is composed of the three features of the turning tooth wheel, and the end portion of the hinge portion at the both ends of the spiral tin tooth and the acute angle side of the end portion of the separating portion are characterized by a rounded shape. . One invention - the object is to provide - (4) the toothed wheel _ has a small diameter radius r 6 200916222 rotary cone table = silk shaft manufacturing method, at the two ends of the spiral _, so that it becomes a phase formation (four) For it. This sharp corner is formed into a stress mask, which contains 4 points in the manufacture of the cap, and no damage occurs.钟日日月之_ rq
圓底深溝之轉钟提供—種轉造牙輪與附有細徑半徑R 20刪以下’而：I造方法，轉造牙輪圓棒的轴外徑為 的細徑3 相對於半徑R的深溝，其軸外徑為4倍以下 法。椒’是附有半徑RBJ底賴之轉造獅轴製造方 圓底明之—目的在於提供—轉造牙輪與附有細徑半徑r 邊妓二之轉魏雜製造方法，_細_棒於先插入側之 的傾斜部’其所形成的面為其特徵，前述細徑是附有 +虹R圓底深溝之轉造螺絲軸製造方法。 【實施方式】 * 乂下係以不同霄施例說明本發明，所述之組成、排列及步 ’等用以”兒明貫知之内容，僅為例示而非用以限制本發明。 =，外’所揭路之内容中使用”及/或，，是為了簡要·，，覆蓋” 或之上”的敘述，則可包含該直接接觸以及沒有直接觸等二 種。 。從上述内容可以了解’此轉造牙輪由立體之中心貫通部之 圓錐台部、ϋ柱部、齡台部所構成的。此轉造牙輪如圖2、 圖3所示’鉸合角度Θ1 -般為3。〜15。比較適宜，離開角度 Θ2與相同也是可以’但是5。〜15。比較適宜，於職狀 7 200916222 斜⑽θ3無魏龍可相佐， 的結果，45〜6〇°是比較適宜的，此外，銳角邊部;：== 候使其成為·綠佳的㈣。 ^在有些時 申明員目3之發明於牙輪表輯定的導程肖， 旋狀縣的-對轉造牙輪之間插人曝，此 == 續螺絲溝槽’其轉造的轉造螺絲軸之製造方法，用:= 述轉造牙輪之中請項目1以及巾請項目2之轉造扑载於則 的軸外徑為20喊下，而且相對於半徑R的深溝， =Γ::為其特徵’是附有半徑R圓底深溝之細 、、糸u法，巾請項目4之發明為細則棒贱插人側之邊 端所定的傾斜部，其所形成的面為其特徵，。 在此發明者將細徑的概念設定為㈣麵以下的轴，深溝 與細徑之_是相對於設於轉造牙輪的職狀麵導程角之 直角剖面形狀，以其半徑R的半圓狀轉印於軸的深溝只，其轴 外徑為半"的4倍町時，稱其騎_深溝。例如半徑rThe rotary clock of the deep bottom of the round bottom provides a kind of turning cone and the diameter of the radius R 20 is deleted as follows: I: The method of making the diameter of the shaft of the cone is the diameter of the shaft 3 relative to the radius R The deep groove has a shaft outer diameter of 4 times or less. 'Pepper' is a rounded lion shaft with a radius of RBJ. The purpose is to provide a transfer-making cone and a manufacturing method with a small diameter radius r and a second turn. The inclined portion of the insertion side is characterized by a surface formed by the same, and the aforementioned small diameter is a manufacturing method of a rotating screw shaft with a + rainbow R round bottom deep groove. [Embodiment] The present invention is described in terms of different embodiments, and the composition, the arrangement, the steps, and the like are used for the purpose of illustration only and are not intended to limit the invention. The use of 'the content of the disclosed roads' and/or, for the sake of brevity, and coverage of "above or above", may include both direct contact and no direct contact. . From the above, it can be understood that the transfer cone is composed of a truncated cone portion, a mast portion, and an aged portion of the three-dimensional center penetration portion. The turning cone is shown in Fig. 2 and Fig. 3 as the 'hinging angle Θ1' is generally 3. ~15. It is more appropriate to leave the angle Θ2 and the same can be 'but 5'. ~15. More suitable, in the role of 7 200916222 oblique (10) θ3 without Wei Long can be matched, the result, 45 ~ 6 〇 ° is more appropriate, in addition, the sharp corners;: = = make it become green (four). ^ In some cases, the invention of the inventor 3 was found in the guide wheel of the cone table, and the rotation of the county was inserted into the cone. This == continued the screw groove' For the manufacturing method of the screw shaft, use: = The item 1 and the towel are required to be transferred to the shaft. The outer diameter of the shaft is 20, and the deep groove relative to the radius R is = Γ:: Its characteristic 'is a radius with a radius R round deep groove, 糸u method, the invention of item 4 is the inclined portion defined by the edge of the ruler insertion side, and the surface formed is Its characteristics, Here, the inventors set the concept of the small diameter to the axis below the (four) plane, and the deep groove and the small diameter are the right-angled cross-sectional shape with respect to the lead angle of the service surface of the transfer cone, and the semicircle with the radius R thereof. It is transferred to the deep groove of the shaft only, and its outer diameter of the shaft is half of the time of the town. Such as radius r
為2.5刪之圓底的溝槽’對於_以下的軸成形時，定義稱 為深溝。 傾斜角度Θ3即使為9〇。也可以，但是銳紐部必須為圓 、欠。於轉造牙輪表面的兩端部也是安全面，因此呈圓角狀比較 ，且。® 2的轉造牙輪之全長為L ,齡部的長度為a，平行 部的長度為b，離開部的長度為c，相對於轉造牙輪的全長， '> _ a所占的比例a/L為2〇〜40%比較適宜，相對於轉造 2輪的全長L ’平行部b所占的比例b/L為3〇〜40%比較適 且相對於轉造牙輪的全長L，離開部c所占的比例^^為2〇 8 200916222 广下比㈣宜，—般來說L若為祕時，a:b:c為4〇%.4〇 ^:20%比㈣宜。轉造牙輪表面與螺旋祕齒之間的面，宜 的數值’相對於半徑R的溝深，可作適朗變更。” 對本發明謂細麵溝的顯補造㈣騎輪如圖3 所示般的職狀鑛齒導程角，以直角·的縣剖面形狀呈半 技R之半®狀’對其溝幅可得最大深度賴，此外因為是半圓 狀’所以溝槽有全體都以均等力量形成之効果，牙輪表面與半 圓狀_之_半徑r取得面’本來在轉造時職溝被轉印 時’溝端面會產生銳角部分，也不會發生，因此去除銳角部的 加工也不需要。於微狀顯兩端的鉸合部端部赫開部端部 的銳角部分都a為是圓触，所_於有傾斜部_棒在開始 加工端部可以順利地進行加壓，因此不會產生表面剝離，而且 於螺旋狀鋸齒兩端部，以傾斜角度θ3形成各離開面，此離開 面的外圍部若是形成圓角邊時，則開始加工端部在最初接觸時 就更容易進入，也不會發生表面剝離或溝端部的銳角邊，於加 工完畢端部也不需要一次減壓，可以階段性地減壓，防止歪斜 的發生，此外，從長向剖面形狀來看，表面形狀的螺旋狀鋸齒 對圓棒以鉸合角度依序加深進入，塑性變形量也依序增 加，所以不會產生激烈的負荷變動，因此圓棒的維持力也會安 定’即使是細徑也可以製作出高精度的溝槽以及高真圓度的 轴0 本發明貫施例以圖說明’圖1為實施例一之轉造牙輪的構 成說明圖’圖2為實施例2之轉造牙輪的構成說明圖，圖3為 圊1、圖2之A-A剖面圖中2的構造說明圖，圖4為本發明轉 9 200916222 圖’圖5為圓棒兩端之傾斜 造牙輪與轉之轉造獅剖面關連 4的轉造螺絲轴製作說明圖。 m τοThe groove of the round bottom which is cut out of 2.5 is defined as a deep groove when it is formed for the shaft below _. The tilt angle Θ3 is even 9 〇. Yes, but the sharp part must be round and owed. Both ends of the surface of the transfer cone are also safety surfaces, so they are rounded and compared. The total length of the transfer cone of ® 2 is L, the length of the aged part is a, the length of the parallel part is b, and the length of the exit part is c, which is relative to the full length of the transfer cone, '> _ a The ratio a/L is preferably from 2〇 to 40%, and the ratio b/L of the full-length L' parallel portion b to the two rounds of conversion is 3〇~40%, and is relatively suitable for the entire length of the transfer cone. L, the proportion of the leaving part c ^ 2 is 2 〇 8 200916222 广下 ratio (four) should be, generally speaking, if L is secret, a: b: c is 4 〇%. 4 〇 ^: 20% ratio (four) should. The surface between the surface of the cone and the spiral tooth can be changed in a suitable value relative to the depth of the radius R. For the invention, the fine groove is obviously added. (IV) The riding wheel has the lead angle of the ore tooth as shown in Fig. 3. The shape of the county with a right angle is semi-technical. The maximum depth depends on it, and because it is semi-circular, the groove has the effect of forming an equal force. The surface of the cone and the radius of the semi-circular shape are the same as when the groove was transferred during the transfer. The end face of the groove will produce an acute angle portion, and it will not occur. Therefore, the processing for removing the acute angle portion is not required. The acute angle portion of the end portion of the end portion of the hinge portion at the ends of the microscopic display is a round contact. In the inclined portion, the rod can be smoothly pressed at the beginning of the machining end, so that no surface peeling occurs, and the respective exit faces are formed at the both ends of the spiral serration at an inclination angle θ3, and if the outer peripheral portion of the exit face is When the rounded edge is formed, the processed end portion is more easily entered at the initial contact, and the surface peeling or the sharp corner edge of the groove end does not occur, and the end portion is not required to be decompressed at the end of the processing, and can be reduced stepwise. Pressure to prevent the occurrence of skew, in addition From the perspective of the long-direction cross-sectional shape, the spiral sawtooth of the surface shape deepens into the round bar in the order of the hinge angle, and the plastic deformation amount also increases sequentially, so that no drastic load fluctuation occurs, so the maintenance force of the round bar is also "Distance" can produce high-precision grooves and high roundness of the axis even if it is a small diameter. The present invention is illustrated by the drawings. FIG. 1 is a structural diagram of the turning wheel of the first embodiment. FIG. 3 is a structural explanatory view of 2 in the AA cross-sectional view of FIG. 1 and FIG. 2, and FIG. 4 is a second embodiment of the present invention. FIG. An explanatory diagram of the turning screw shaft of the inclined sprocket wheel and the turn lion section 4. m το
1所示般，㈣、轉造用牙輪之構成，實施例一如圖 、轉ie牙輪1之此牙輪表面2， A 狀鑛齒3導程角40。以亩A 冰成錐形的螺方疋 3所示妒si U開之A—A剖面圖的剖面形狀如圖 齒/之門’、主 2. 5細的半圓狀’轉造牙輪表面2與錐形 Γ的矣徑r=G.7mm取得面，從長向剖面形狀來看’於圖 2狀與轉造牙輪丨的中心軸線呈㈣。鉸合角度之錢 口 Μ及與轉针輪丨_心憾呈平 =有ί轉造牙輪1的中心抽線觸。離開角之離開： 、別述螺方疋狀鑛齒3兩端部的錢合部端部以及離開部 j之銳角邛使其成為圓角邊，對錢合部對平行直線部對離 開部之比例，姆於全長為鄕，％:戰所構成的2條螺 、·糸衣每用之轉造牙輪’如圖4所示般，將此一對轉造牙輪！裝 置於轉造機，將域傾斜丨。，轉造牙輪i之間，插入外徑φ 10mm圓棒7後’於此圓棒7的外圍，施以連續的螺絲溝進行 轉造，如圖5所示般，可以製造外徑為Φ10麵，半徑2. 5mm之 圓底的深溝轉造螺絲軸8。此時鼓面的兩端部殘留著銳角邊， 繼續試驗之後’此部分因為沒有與圓棒接觸’所以並沒有問 題’但是銳角邊可能會割傷手指發生事故，因此這個部分也希 望能設計為圓角邊。 接下來說明實施例2的轉造用牙輪1之構成，實施例2如 圖2所示般’於轉造牙輪1之此牙輪表面2，對形成錐形的螺 旋狀鑛齒3的導程角40。以直角剖開之剖面形狀如圖3所示 200916222 的繼，細輪2麵形齒3之 間以+位M). 7m味得面，從長向剖面形狀來看，於圖 面形狀與轉造牙輪1的N軸線呈Θ㈣鉸合角度之鉸合部 4，以及與轉造牙輪丨財冲線呈平行部分的平行直線部5， 還有與轉造牙輪1的中心軸線呈昨5。離開狀離開部6所構 成’在螺旋狀鑛齒3的兩端部，以轉造牙輪j的中心轴線與轉 造牙輪表面3之傾斜纽ΘΗ5。軸的各_面9，此離開 面9的外_也施明角邊，齡部辭行直線部對離開部之 比例，相對於全長為鄕:鄕:職所構成的2條螺絲製造 用之轉造牙輪卜如圖4所示般，將此―對槪牙輪1裝置於 轉造機，將主軸傾斜丨。，轉造牙輪丨之間插人外徑帽刪圓 棒7後，於此圓棒7的外圍，施以連續的螺絲溝進行轉造，如 圖5所示般，可以製造外徑Φ10刪的軸，半徑2. 5咖之圓底 的深溝轉造螺絲軸8。將此實施例2的軸與實施例一製造之軸 作比較，結果實施例2較有優越性，依照用途不同，實施例一 之軸也可通用。As shown in Fig. 1, (4), the configuration of the transfer cone, the first embodiment is shown in Fig. 1, the cone surface 2 of the turning cone 1 and the A-shaped ore 3 lead angle 40. The cross-sectional shape of the A-A section of the 妒si U is shown in Fig. 3, and the main 2. 2 thin semicircular 'turning cone surface 2 The surface of the tapered crucible is r=G.7mm, and the shape of the long cross-sectional shape is shown in Fig. 2 and the central axis of the rotating rim is (4). The hinge angle of the money Μ and the needle rim _ _ regrets flat = there ί turn the center of the roller 1 touch. The departure angle of the departure corner: 别, the end of the coin joint portion at both ends of the spur-like ore-like tooth 3 and the acute angle 离开 of the exit portion j to make it a rounded edge, and the parallel portion to the parallel portion Proportion, M is full length, %%: 2 snails made up of battles, 每 每 每 每 每 每 每 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' Install on the transfer machine and tilt the field. Between the transfer cones i, after inserting the round rod 7 with an outer diameter of φ 10 mm, the outer circumference of the round rod 7 is rotated, and a continuous screw groove is applied for transformation. As shown in Fig. 5, the outer diameter can be made Φ10. The deep groove of the round bottom with a radius of 2. 5 mm is converted into a screw shaft 8. At this time, there are sharp edges on both ends of the drum surface. After continuing the test, 'this part is not in contact with the round bar', so there is no problem. But the sharp corner may cut the finger and cause an accident, so this part also hopes to be designed as Rounded edges. Next, the configuration of the transfer cone 1 of the second embodiment will be described. In the second embodiment, as shown in FIG. 2, the cone surface 2 of the transfer cone 1 is formed on the spiral tooth 3 which is tapered. Lead angle 40. The cross-sectional shape cut at right angles is shown in Fig. 3 as shown in Fig. 3, and the thin wheel 2 face teeth 3 are in the position of +M. 7m. From the long cross-sectional shape, the shape and rotation of the surface are shown. The N axis of the cone 1 is a hinge portion 4 of a Θ (4) hinge angle, and a parallel straight portion 5 parallel to the traverse line of the turning cone, and a central axis with the turning cone 1 5. The free-formed portion 6 is formed at both ends of the helical ore 3 to rotate the central axis of the cone j and the inclined ridge 5 of the rotating cone surface 3. Each of the _ planes 9 of the shaft, the outer side of the leaving surface 9 is also a corner, and the ratio of the straight line portion to the leaving portion of the grading portion is 相对: 鄕: the rotation of the two screws for the manufacturing position As shown in Fig. 4, the tooth-making wheel is mounted on the converting machine to tilt the main shaft. After inserting the outer diameter cap between the turning burrs and cutting the round bar 7, the outer periphery of the round bar 7 is transformed by a continuous screw groove, as shown in Fig. 5, the outer diameter Φ10 can be manufactured. The shaft, the radius of 2. 5 coffee round bottom of the deep groove to turn the screw shaft 8. Comparing the shaft of this Example 2 with the shaft manufactured in the first embodiment, the result of the second embodiment is superior, and the shaft of the first embodiment can be used in accordance with the use.
此外圓棒7是使用重新將尖端部傾斜的軸以及沒有傾斜 部的軸、後端部也使其傾斜的軸以及沒有傾斜部的軸共4種形 狀圓棒軸’而製造轉造螺絲軸的結果是兩端有傾斜部的圓棒之 轉造為最佳轉造螺絲軸之製造方法。 雖然本發明已以較佳實施例揭露如上’然其並非用以限定 本發明’任何熟習此項技藝者，在不脫離本發之精神和範圍 内，可做各種變動、修改及潤飾，因此本發明之保護管圍當視 後附之申請專利範圍所界定者為準。 200916222 【圖式簡單說明】 圖1實施例一之轉造牙輪的構成說明圖。 圖2實施例二之轉造牙輪的構成說明圖。 圖3圖1及圖2之A-A剖面圖中，分成兩部分的構造說明圖。 圖4本發明之轉造牙輪與圓棒之轉造螺絲切剖相關圖。 圖5於圓棒端面設計傾斜部，所製作的轉造螺絲軸之說明圖。 【主要元件符號說明】 1 轉造牙輪 2 牙輪表面 3 螺旋狀鋸齒 4 鉸合部 5 平行直線部 6 離開部 7 圓棒 8 轉造螺絲軸 9 離開面 12Further, the round bar 7 is manufactured by using a shaft that re-tilts the tip end portion and a shaft that has no inclined portion, a shaft that is inclined at the rear end portion, and a shaft that has no inclined portion and a total of four types of round bar shafts. As a result, the round bar having the inclined portions at both ends is converted into a method for manufacturing the optimum screw shaft. The present invention has been described in its preferred embodiments, and is not intended to limit the scope of the present invention. The protection of the invention is defined in the scope of the patent application. 200916222 [Simplified description of the drawings] Fig. 1 is a block diagram showing the structure of the transfer cone of the first embodiment. Fig. 2 is a block diagram showing the structure of the transfer cone of the second embodiment. 3 is a structural explanatory view divided into two parts in a cross-sectional view taken along line A-A of FIG. 1 and FIG. Fig. 4 is a cross-sectional view showing the cutting screw of the transfer cone and the round bar of the present invention. Fig. 5 is an explanatory view of the converted screw shaft produced by designing the inclined portion on the end face of the round bar. [Description of main components] 1 Turning cone 2 Cone surface 3 Spiral serrations 4 Hinge 5 Parallel straight section 6 Separation section 7 Round bar 8 Turning screw shaft 9 Exiting surface 12