WO2012026576A1 - ヘリカルブローチ - Google Patents
ヘリカルブローチ Download PDFInfo
- Publication number
- WO2012026576A1 WO2012026576A1 PCT/JP2011/069281 JP2011069281W WO2012026576A1 WO 2012026576 A1 WO2012026576 A1 WO 2012026576A1 JP 2011069281 W JP2011069281 W JP 2011069281W WO 2012026576 A1 WO2012026576 A1 WO 2012026576A1
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- WO
- WIPO (PCT)
- Prior art keywords
- broach
- blade
- groove width
- end side
- blades
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D43/00—Broaching tools
- B23D43/02—Broaching tools for cutting by rectilinear movement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D43/00—Broaching tools
- B23D43/005—Broaching tools for cutting helical grooves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F21/00—Tools specially adapted for use in machines for manufacturing gear teeth
- B23F21/26—Broaching tools
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/16—Rectilinear broach
Definitions
- the present invention relates to a helical broach used for cutting a workpiece, for example, when manufacturing a helical internal gear having a twisted groove on its inner periphery.
- This application claims priority based on Japanese Patent Application No. 2010-191074 for which it applied to Japan on August 27, 2010, and uses the content here.
- a helical internal gear is a planetary internal gear.
- Various planetary internal gears are provided as gears for automatic transmissions.
- high quality gears are also required.
- the helical broach is used for processing such a helical internal gear.
- a plurality of cutting blades projecting radially outward of the broach main body are provided on the outer peripheral portion of the rod-shaped broach main body from the front end side to the rear end side of the broach main body.
- a helical broach arranged in a spiral shape that twists around the axis of the main body has been proposed.
- the cutting edge on the tip side of the broach body is a rough edge (groove depth expanding blade), and the cutting edge on the rear end side of the broach body is a finishing blade (groove width expanding blade).
- a cutting blade is formed at the crossing ridge line portion between the rake face facing the tip side of the broach body and the side surface facing one side of the circumferential direction of the broach body, and the side opposite to the cutting blade
- a guide blade is formed at the intersecting ridge line portion between the side surface and the rake face.
- a predetermined tooth thickness is finished by a finishing blade group whose thickness increases sequentially.
- finishing the tooth thickness first, cut one side of the tooth profile (for example, the acute angle side surface) in the tooth thickness direction and then cut the other side surface (for example, the obtuse angle side surface) of the tooth profile. Finish in the desired tooth profile by cutting in the direction.
- the present invention has been made under such a background, and an object of the present invention is to provide a helical broach that can prevent overcutting by a finished final blade and that can machine a workpiece with good tooth trace accuracy.
- the helical broach of the present invention protrudes from the outer peripheral portion of the broach body formed in a rod shape to the outer side in the radial direction of the broach body, and the tip of the broach body
- a helical broach that forms a twisted groove on the inner periphery of a machining hole of a workpiece by a plurality of cutting blades arranged in a spiral shape that twists about the axis of the broach body from the side to the rear end side, wherein the plurality of cutting blades Has a plurality of groove depth enlarging blades arranged on the front end side of the broach body and a plurality of groove width enlarging blades arranged on the rear end side of the broach body, A cutting blade formed on a cross ridge line portion between a rake face facing the tip side of the broach body and a side surface facing one of the wall surfaces of the twisted groove of the workpiece, and the cutting blade
- a guide blade is formed instead of the cutting blade on the groove width expanding blade located on the most rear end side of the broach body among the plurality of groove width expanding blades on the rear end side of the broach body. . Therefore, the groove width widening blade located on the most rear end side does not have a function of cutting. As a result, the groove width widening blade located on the most rear end side guides the groove width widening blade (which becomes the final finishing blade substantially) immediately ahead by the guide blade.
- the number of grooves acting on the workpiece of the groove width widening blade changes on the circumference of the groove width widening blade located on the most rear end side of the broach body,
- the behavior of the helical broach may become unstable. Even in such a case, according to the present invention, as described above, since the groove width widening blade located on the most rear end side of the broach body does not have a function of cutting, the workpiece is overcut. There is nothing to do.
- the groove width expanding blade located on the most rear end side of the broach body is formed to recede in the tooth thickness direction with respect to the groove width expanding blade positioned immediately ahead of the row to which the groove width expanding blade belongs. Also good.
- this type of helical broach it is customary to regrind when the cutting function is reduced.
- the groove width expanding blade located on the most rear end side of the broach body is formed so as to recede in the tooth thickness direction from the groove width expanding blade located immediately ahead, Even so, it is possible to avoid protruding in the tooth thickness direction from the front groove width expanding blade. Thereby, after re-grinding, it is possible to prevent the occurrence of problems such as overcutting the workpiece with the groove width widening blade located on the most rear end side of the broach body.
- a negative clearance angle ⁇ c may be formed in a range of 0.5 ° ⁇ ⁇ c ⁇ 2 ° on the guide blade of the groove width widening blade located on the most rear end side of the broach body. In this way, by forming a negative clearance angle in such a range in the guide blade, the groove width expanding blade located on the most rear end side of the broach main body can cut the groove width expanding blade ahead of it without performing cutting. The function of guiding can be exhibited more reliably. If the negative clearance angle formed on the guide blade is smaller than 0.5 °, the guide blade may cause a cutting function depending on the behavior of the helical broach with respect to the workpiece. Further, when the negative clearance angle of the guide blade is larger than 2 °, the gap amount at the tip of the guide blade increases, and there is a possibility that accurate guide cannot be performed.
- the second and third or second to fourth groove width widening blades counted from the rear end side of the broach body among the groove width widening blades in a row are set to have the same amount of protrusion in the tooth thickness direction. May be.
- the helical broach is used at the final stage of processing by setting the protrusion amount in the tooth thickness direction of two or three groove width expansion blades to the same value except for the groove width expansion blade located on the most rear end side of the broach body. Stabilizes the behavior of the helical broach relative to the workpiece as it exits the workpiece. Thereby, a tooth profile with excellent accuracy can be formed on the workpiece.
- the groove width expanding blades are arranged on the circumference of the groove width expanding blade located on the most rear end side of the broach body. Even if the number of sheets acting on the workpiece changes and the behavior of the helical broach becomes unstable, there is no function for cutting the groove width widening blade located at the rearmost end of the broach body, A tooth profile with excellent accuracy can be formed without cutting.
- FIG. 1 It is a side view which shows embodiment in the case of applying this invention to an off-normal type helical broach. It is the schematic diagram which looked at the row of groove width expansion blades in an embodiment from the upper part. It is a schematic diagram explaining a plurality of groove width expansion blades on the rear end side of the broach body among the groove width expansion blades. It is a schematic diagram explaining the condition after re-grinding about the some groove width expansion blade shown in FIG.
- FIG. 1 is a side view showing an embodiment when the present invention is applied to a helical broach.
- the helical broach according to the present embodiment brows a workpiece in order to manufacture a helical internal gear such as a planetary internal gear having a twisted groove on the inner periphery described above.
- the broach main body 1 has a long rod shape with the axis O as the center.
- Grip portions 2 and 3 are formed at both ends of the broach body 1.
- a cutting edge portion 4 is formed between the grip portions 2 and 3.
- a plurality of cutting edges 5 projecting radially outward from the outer periphery of the broach main body 1 from the front end side (left side in FIG. 1) to the rear end side (right side in FIG. 1). They are arranged so as to form a spiral along the lead L that is twisted around the axis O. A plurality of rows of these cutting blades 5 are formed at intervals in the circumferential direction. 1 shows that the present invention is applied to an off-normal type (helical blade groove type) integrated helical broach in which a blade groove formed between a plurality of cutting blades 5 in the direction of the axis O is twisted around the axis O. An example is shown.
- a plurality of cutting blades 5 at the tip side of the broach main body 1 in the cutting blade portion 4 are groove depth expanding blades 6 for driving the tooth profile of the helical internal gear in the tooth height direction and cutting it.
- the height of the cutting blade 5 increases sequentially toward the rear end side of the broach body 1 along the row of the cutting blades 5.
- the cutting edge portion 4 on the rear end side of the broach main body 1 with respect to the groove depth expanding blade 6 is forced to cut in the tooth thickness direction (that is, the circumferential direction of the broach main body 1) to change the tooth profile of the helical internal gear to a predetermined shape.
- a plurality of groove width expanding blades 7 having a tooth thickness are provided.
- the tooth surface of the tooth profile cut to a predetermined tooth height by the groove depth expanding blade 6 (that is, both groove wall surfaces of the torsional groove of the workpiece) is driven and cut in the tooth thickness direction by the groove width expanding blade 7.
- the tooth profile of the helical internal gear is formed to a predetermined tooth thickness. That is, after a tooth having a predetermined tooth height is formed by the group 6 of groove depth expanding blades whose height increases sequentially, a predetermined tooth thickness is finished by the group of blade width expanding blades 7 whose thickness gradually increases.
- the portion where the groove width expanding blades 7 are arranged may be provided with round blades for cutting the tooth crests alternately with the groove width expanding blades 7.
- the round blade may be provided on the rear end side of the groove width widening blade 7.
- the groove depth expanding blade 6, the groove width expanding blade 7, and all the cutting blades 5 of the round blade are integrally formed on the broach body 1.
- FIG. 2 is a schematic view of one row of the groove width expanding blade 7 in the embodiment as viewed from above.
- FIG. 3 is a schematic diagram for explaining a plurality of groove width expanding blades on the rear end side of the broach body in the groove width expanding blade 7.
- the plurality of groove width expanding blades on the rear end side of the broach main body refer to a plurality of groove width expanding blades at a position indicated by III in FIG.
- the scale of the vertical axis is about 10 times the scale of the horizontal axis, and the angle of the guide blade is exaggerated for easy viewing.
- the plurality of groove width expanding blades 7 include a plurality of groove width expanding blades 7 ⁇ / b> A provided on the front end side of the broach body 1 so as to follow the groove depth expanding blade 6, and the broach body 1.
- the plurality of groove width-enlarging blades 7A drive and cut one of the two wall surfaces of the torsional groove of the workpiece.
- the plurality of groove width expanding blades 7B drive and cut the other wall surface of both groove wall surfaces.
- a cutting blade 9 is formed at an intersecting ridge line portion between a scoop surface 5 ⁇ / b> A facing the tip end side of the broach body 1 of the cutting blade 5 and a side surface 5 ⁇ / b> B facing a groove wall surface to be driven and cut.
- the cross ridge line portion between the guide surface 5C and the rake face 5A facing the groove wall surface on the opposite side of the groove wall surface to be driven and cut is formed on the groove wall surface opposite to the groove wall surface to be driven and cut by the cutting blade 9.
- a guide blade 10 that slides and guides the groove width expanding blade 7 is formed.
- a guide portion 11 is constituted by the guide surface 5 ⁇ / b> C and the guide blade 10.
- the groove width enlarging blade 7A on the front end side of the broach body 1 has the above-described crossing ridge line portion between the rake face 5A and the acute angle side (lower side in FIG. 2) 5B as shown in FIG. A cutting blade 9 is formed.
- the obtuse angle side (upper side in FIG. 2) side surface is the guide surface 5C, and the guide blade 10 is formed at an intersecting ridge line portion with the rake face 5A.
- an angle formed by the rake face 5A and a straight line parallel to the lead L passing through both ends of the rake face 5A is referred to as an acute angle side
- an obtuse angle is referred to as an obtuse angle side.
- the cutting blade 9 is formed at the intersecting ridge line portion between the rake face 5A and the obtuse angle side face 5B.
- the side surface on the acute angle side is a guide surface 5C, and the guide blade 10 is formed at an intersecting ridge line portion with the rake face 5A.
- the side surface 5B of the groove width increasing blade 7 connected to the cutting blade 9 and the side surface on which the guide surface 5C is formed are directed toward the rear end side of the broach body 1 with respect to the cutting blade 9 and the guide blade 10, respectively.
- a clearance angle is formed.
- a positive clearance angle ⁇ a is formed on the side surface continuous with the cutting blade 9.
- a clearance angle ⁇ b is formed on the side surface connected to the guide blade 10.
- the obtuse angle side guide blades 10 are arranged along the leads L.
- the cutting blade 9 on the acute angle side is disposed so as to gradually protrude in the tooth thickness direction as indicated by a symbol Xa in FIG.
- the guide blade 10 on the acute angle side is the rearmost end of the plurality of groove width expanding blades 7A on the front end side of the broach body 1. It arranges so that it may continue along the said lead L from the cutting blade 9 of things.
- the obtuse-angled cutting blade 9 gradually moves in the tooth thickness direction as indicated by the symbol Xb in FIG. 2 from the guide blade 10 of the groove width expanding blade 7A on the front end side of the broach main body 1 toward the rear end side along the lead L. It arrange
- the last blade located on the most rear end side among the plurality of groove width expanding blades 7B on the rear end side of the broach body 1 is the groove width expanding blade 7BB.
- Groove width widening blade 7BB is guided blade 13 instead of cutting blade 9 at the crossing ridge line portion between scoop surface 5A and side surface 5BB facing one side in the circumferential direction of broach body 1 (in this embodiment, the obtuse angle side). Is formed.
- the cutting blade 9 is formed at the intersecting ridge line portion between the rake face 5A and the obtuse angle side surface 5B, but on the most rear end side of the broach main body.
- the guide blade 13 is formed in place of the cutting blade only in the groove width expanding blade 7BB located.
- a negative clearance angle ⁇ c with respect to the guide blade 13 is formed on the side surface 5BB on the obtuse angle side of the groove width expanding blade 7BB located on the most rear end side of the broach body.
- the guide blade 13 is formed in the intersection ridgeline part of the rake face 5A and the obtuse angle side face 5BB.
- the negative clearance angle ⁇ c is set in a range of 0.5 ° ⁇ ⁇ c ⁇ 2 °.
- a flat portion 14 parallel to the lead L is formed on the obtuse angle side surface where the guide blade 13 of the groove width expanding blade 7BB located on the most rear end side of the broach body is formed (the flat portion is In some cases, it is formed to be inclined with respect to the lead L so as to approach the acute angle side toward the rear end).
- the groove width expanding blade 7BB is forced to cut by the tooth width direction (more specifically, the groove width expanding blade 7B) than the groove width expanding blade 7B located immediately ahead of the row to which the groove width expanding blade 7BB belongs.
- the tooth width direction more specifically, the groove width expanding blade 7B
- the retraction amount Y is set to a value that prevents the groove width expanding blade 7BB from protruding in the tooth thickness direction more than the groove width expanding blade 7B positioned immediately ahead even when the cutting blade 5 is reground. . Specifically, the retraction amount Y is set to an appropriate value in the range of 0 ⁇ Y ⁇ 20 ⁇ m.
- the second and third or second to fourth groove width expanding blades 7B counted from the rear end side of the broach body among the plurality of groove width expanding blades on the rear end side of the broach bodies in a row are teeth
- the amount of protrusion in the thickness direction is set to the same value. That is, in the case of several groove width expanding blades 7B located on the rear end side of the broach main body excluding the groove width expanding blade 7BB, even when heading toward the rear end side along the lead L, the cutting blades 9 on the obtuse angle side thereof are The protrusions are set to the same amount without protruding in the tooth thickness direction.
- the broach main body 1 is inserted into a machining hole formed in advance on the workpiece from the tip side. Then, the broach body 1 is rotated while being advanced relative to the work along the lead L. Thereby, the torsion groove is first formed to a predetermined depth by the groove depth expanding blade 6.
- the guide blade 10 of the groove width expanding blade 7A on the distal end side of the broach main body 1 is in sliding contact with the groove wall surface on the obtuse angle side of the twisted groove to guide the groove width expanding blade 7A, while the front end side of the broach main body 1 is touched.
- the groove wall surface on the acute angle side of the twisted groove is cut by the cutting blade 9 of the groove width expanding blade 7A. Thus, finishing is performed on the groove wall surface on the acute angle side from the groove width.
- the guide blade 10 of the groove width expanding blade 7B on the rear end side of the broach body 1 is brought into sliding contact with the groove wall on the acute angle side to guide the groove width expanding blade 7B.
- the groove wall surface on the obtuse angle side of the twisted groove is cut by the cutting blade 9 of the groove width expanding blade 7B on the rear end side.
- a finishing process is performed on the groove wall surface on the obtuse angle side from the groove width to form a twisted groove having a desired groove width.
- the guide blade 13 is formed instead of the cutting blade on the groove width expanding blade 7BB located on the most rear end side among the plurality of groove width expanding blades 7B on the rear end side of the broach body, cutting is performed. There is no function to do. For this reason, the groove width widening blade 7BB located on the most rear end side of the broach body guides the groove width widening blade 7B on the tip side of the broach body by the guide blade 13.
- the number of the groove width expanding blades acting on the workpiece changes on the circumference of the groove width expanding blade located on the most rear end side of the broach body. Even if the behavior of the helical broach becomes unstable, as described above, there is no function of cutting the groove width widening blade located on the most rear end side of the broach body. Therefore, the workpiece is not overcut, and a tooth profile with excellent accuracy can be formed on the workpiece.
- the groove width expanding blade 7BB located on the most rear end side of the broach main body is toothed more than the groove width expanding blade 7B positioned immediately ahead of the row to which the groove width expanding blade 7BB belongs. It is formed to recede in the thickness direction. Therefore, as shown in FIG. 4, even after re-grinding, even when the land width Wa of the thickened blades 7B and 7BB is reduced to Wb (for example, 1.5 mm), the broach main body is moved to the rearmost end side. It can avoid that the groove width expansion blade 7BB located protrudes in a tooth thickness direction rather than the front groove width expansion blade. As a result, after regrinding, it is possible to prevent the occurrence of problems such as overcutting the workpiece with the groove width widening blade 7BB located on the most rear end side of the broach body.
- the negative clearance angle ⁇ c is appropriately set within the range of 0.5 ° ⁇ ⁇ c ⁇ 2 ° to the guide blade 13 of the groove width expanding blade 7BB located on the most rear end side of the broach body. Formed with values. Therefore, the groove width widening blade 7BB located on the most rear end side of the broach body can more reliably exhibit the function of guiding the groove width widening blade 7B ahead without performing cutting.
- the second and third or the second to fourth counts from the rear end side of the broach main body among the plurality of groove width expanding blades on the rear end side of the broach main bodies forming a row.
- the groove width widening blades are set so that the protruding amounts in the tooth thickness direction have the same value. Therefore, the behavior of the helical broach with respect to the workpiece can be stabilized when the helical broach at the final stage of machining comes out of the workpiece. As a result, a more accurate tooth profile can be formed on the workpiece.
- this invention is not limited to the above-mentioned embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
- the present invention is not limited to this, and the present invention can also be applied to a straight shaft type helical broach or an assembled type helical broach in which the groove width expanding blade 7 is provided in a shell separate from the broach body. It is.
- the groove width expanding blades are arranged on the circumference of the groove width expanding blade located on the most rear end side of the broach body. Even if the number of sheets acting on the workpiece changes and the behavior of the helical broach becomes unstable, there is no function for cutting the groove width widening blade located at the rearmost end of the broach body, A tooth profile with excellent accuracy can be formed without cutting.
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Abstract
Description
本願は、2010年8月27日に日本出願された特願2010-191074に基づいて優先権を主張し、その内容をここに援用する。
ヘリカルブローチは、このようなヘリカル内歯車の加工に用いられる。例えば、下記特許文献1には、棒状のブローチ本体の外周部に、該ブローチ本体の径方向外周側に突出する複数の切刃が、このブローチ本体の先端側から後端側に亘って該ブローチ本体の軸線回りに捩れる螺旋状に配列されたヘリカルブローチが提案されている。このヘリカルブローチは、上記切刃のうちブローチ本体の先端側の切刃が荒刃(溝深拡大刃)であり、ブローチ本体の後端側の切刃が仕上げ刃(溝幅拡大刃)である。この仕上げ刃において、ブローチ本体の先端側を向くすくい面と上記ブローチ本体の周方向のうちいずれか一方の側を向く側面との交差稜線部に切削刃が形成され、この切削刃とは反対側の側面と上記すくい面との交差稜線部はガイド刃が形成されている。
このようなヘリカルブローチによって、ワークを加工して所望の歯形を有するヘリカル内歯車を形成する。具体的には、高さが順次増大する荒刃群によって所定の歯丈を有する歯を形成した後に、厚さが順次増大する仕上げ刃群によって所定の歯厚に仕上げる。歯厚に仕上げる際には、まず、歯形の一方の側面(例えば、鋭角側の側面)を歯厚方向に追い込み切削し、次いで、歯形の他方の側面(例えば、鈍角側の側面)を歯厚方向に追い込み切削して所望の歯形に仕上げる。
特に、隣接する切刃がブローチ本体の軸線に対して斜めに傾斜して配置されるオフノルマルタイプのヘリカルブローチにあっては、加工の最終段階のヘリカルブローチがワークから抜け出るときに、円周上に沿って配置される最終刃が同時ではなく順に抜け出るため、上記問題は顕著に現れる。
この種のヘリカルブローチでは、切削機能が低下したときに再研削するのが通例である。前述のように、ブローチ本体の最も後端側に位置する上記溝幅拡大刃をそのすぐ先方に位置する溝幅拡大刃よりも歯厚方向に後退して形成されていると、再研削した後であっても、先方の溝幅拡大刃よりも歯厚方向に突出するのを回避できる。これにより、再研削後において、ブローチ本体の最も後端側に位置する溝幅拡大刃によりワークを過切削するといった不具合の発生を未然に防止できる。
このように、ガイド刃にこのような範囲の負の逃げ角を形成することで、ブローチ本体の最も後端側に位置する溝幅拡大刃が、切削を行うことなくその先方の溝幅拡大刃をガイドする機能をより確実に発揮させることができる。
なお、ガイド刃に形成する負の逃げ角を0.5°より小さくすると、当該ヘリカルブローチのワークに対する挙動によっては、ガイド刃が切削機能を生じさせるおそれが生じる。
また、ガイド刃の負の逃げ角を2°より大きくすると、ガイド刃の先端の空隙量が大きくなり、正確なガイドが行えなくなるおそれが生じる。
ブローチ本体の最も後端側に位置する溝幅拡大刃を除き、2枚あるいは3枚の溝幅拡大刃の歯厚方向の突出量を同じ値に設定することにより、加工の最終段階においてヘリカルブローチがワークから抜け出るときに、ワークに対するヘリカルブローチの挙動を安定させる。これにより、ワークに対して精度の優れた歯形を形成することができる。
なお、図1は、軸線O方向において複数の切刃5の間に形成される刃溝がこの軸線O回りにねじれたオフノルマルタイプ(ネジレ刃溝タイプ)の一体形ヘリカルブローチに本発明を適用した例を示す。
なお、切刃部4のうち上記溝幅拡大刃7が配列される部分には、歯形の歯頂部を切削する丸刃が溝幅拡大刃7と交互に備えられていてもよい。また、この丸刃は、溝幅拡大刃7の後端側に備えられていてもよい。本実施形態では、これら溝深拡大刃6、溝幅拡大刃7、および丸刃のすべての切刃5が、ブローチ本体1に一体に形成されている。
これに対して、ブローチ本体1の後端側の溝幅拡大刃7Bでは、すくい面5Aと鈍角側の側面5Bとの交差稜線部に切削刃9が形成されている。また、鋭角側の側面がガイド面5Cであり、上記ガイド刃10がそのすくい面5Aとの交差稜線部に形成されている。
一方、ブローチ本体1の後端側の複数の溝幅拡大刃7Bにおいては、その鋭角側のガイド刃10が、概ね上記ブローチ本体1の先端側の複数の溝幅拡大刃7Aのうち最後端のものの切削刃9から上記リードLに沿って連なるように配列される。鈍角側の切削刃9は、ブローチ本体1の先端側の溝幅拡大刃7Aのガイド刃10からリードLに沿って後端側に向かうに従い、図2中符号Xb示すように歯厚方向に徐々にせり出すように配設される。
この後退量Yは、切刃5を再研削した場合であっても、溝幅拡大刃7BBがそのすぐ先方に位置する溝幅拡大刃7Bよりも歯厚方向にせり出さない値に設定される。具体的には、後退量Yは、0<Y≦20μmの範囲の適宜値に設定される。
まず、ブローチ本体1を先端側からワークに予め形成した加工穴に挿入する。そして、該ブローチ本体1を上記リードLに沿ってワークに対し相対的に前進させつつ回転させる。これにより、まず溝深拡大刃6によって所定の深さまで捩れ溝を形成する。次いで、この捩れ溝の鈍角側の溝壁面にブローチ本体1の先端側の溝幅拡大刃7Aのガイド刃10が摺接して該溝幅拡大刃7Aを案内しながら、このブローチ本体1の先端側の溝幅拡大刃7Aの切削刃9により捩れ溝の鋭角側の溝壁面を切削する。これにより、溝幅から鋭角側の溝壁面に仕上げ加工を施す。
例えば、本実施形態では、本発明をオフノルマルタイプの一体型ヘリカルブローチに適用した例について説明した。しかし、これに限られることなく、本発明は、軸直タイプのヘリカルブローチにも、あるいは溝幅拡大刃7がブローチ本体とは別体のシェルに設けられた組立型のヘリカルブローチにも適用可能である。
4 切刃部
5 切刃
6 溝深拡大刃
7 溝幅拡大刃
7A ブローチ本体1の先端側の溝幅拡大刃
7B ブローチ本体1の後端側の溝幅拡大刃
9 切削刃
10 ガイド刃
13 ガイド刃
θc 負の逃げ角
O ブローチ本体1の軸線
L 切刃5のリード
Claims (5)
- 棒状に形成されたブローチ本体の外周部から該ブローチ本体の径方向外側に突出し、前記ブローチ本体の先端側から後端側に亘り前記ブローチ本体の軸線回りに捩れる螺旋状に配列された複数の切刃により、ワークの加工穴内周に捩れ溝を形成するヘリカルブローチであって、
前記複数の切刃は、前記ブローチ本体の先端側に配列された複数の溝深拡大刃と、前記ブローチ本体の後端側に配列された複数の溝幅拡大刃とを有し、
前記複数の溝幅拡大刃は、ブローチ本体の先端側を向くすくい面と前記ワークの前記捩れ溝の両溝壁面のうちの一方の壁面を向く側面との交差稜線部に形成された切削刃と、該切削刃が形成された側面の反対側の側面と前記すくい面との交差稜線部に形成されたガイド刃とを有し、
前記溝幅拡大刃のうちの前記ブローチ本体の最も後端側に位置する溝幅拡大刃は、前記すくい面と前記ワークの前記捩れ溝の両溝壁面のうちの一方の壁面を向く側面との交差稜線部に前記切削刃に代えてガイド刃が形成されているヘリカルブローチ。 - 請求項1に記載のヘリカルブローチであって、
前記ブローチ本体の最も後端側に位置する前記溝幅拡大刃は、該溝幅拡大刃が属する列のすぐ先方に位置する前記溝幅拡大刃よりも歯厚方向に後退して形成されているヘリカルブローチ。 - 請求項1に記載のヘリカルブローチであって、
前記ブローチ本体の最も後端側に位置する前記溝幅拡大刃の前記ガイド刃には、負の逃げ角θcが0.5°≦θc≦2°の範囲で形成されているヘリカルブローチ。 - 請求項2に記載のヘリカルブローチであって、
前記ブローチ本体の最も後端側に位置する前記溝幅拡大刃の前記ガイド刃には、負の逃げ角θcが0.5°≦θc≦2°の範囲で形成されているヘリカルブローチ。 - 請求項1~4のいずれか一項に記載のヘリカルブローチであって、
列をなす前記溝幅拡大刃のうちの前記ブローチ本体の後端側から数えて2番目と3番目または2番目~4番目の溝幅拡大刃は、歯厚方向の突出量が同じ値に設定されているヘリカルブローチ。
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WO2005086831A2 (en) | 2004-03-10 | 2005-09-22 | Orbus Medical Technologies, Inc. | Endothelial ligand binding coated medical device |
CN102806387A (zh) * | 2012-08-16 | 2012-12-05 | 四川省绵阳西南自动化研究所 | 一种用于等壁厚螺杆钻具定子加工的拉刀 |
JP6044350B2 (ja) * | 2013-01-09 | 2016-12-14 | 三菱マテリアル株式会社 | ヘリカルブローチ |
JP6190120B2 (ja) * | 2013-02-14 | 2017-08-30 | 三菱重工工作機械株式会社 | ヘリカルブローチ |
JP6037880B2 (ja) * | 2013-02-14 | 2016-12-07 | 三菱重工工作機械株式会社 | ヘリカルブローチおよびヘリカルブローチ修繕方法 |
KR101913918B1 (ko) * | 2014-05-30 | 2018-10-31 | 미츠비시 쥬코우 고우사쿠 기카이 가부시키가이샤 | 스카이빙 가공용 커터 |
CN105057778B (zh) * | 2015-09-24 | 2018-04-06 | 成都格润特高新材料有限公司 | 一种整体硬质合金内外倒角组合拉刀 |
JP7117825B2 (ja) * | 2016-04-11 | 2022-08-15 | 三菱マテリアル株式会社 | ヘリカルブローチ及びブローチ加工方法 |
JP6745133B2 (ja) * | 2016-05-12 | 2020-08-26 | 三菱マテリアル株式会社 | ブローチ |
JP6772561B2 (ja) * | 2016-06-01 | 2020-10-21 | 三菱マテリアル株式会社 | ヘリカルブローチ |
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JP2018140485A (ja) * | 2017-02-28 | 2018-09-13 | 株式会社不二越 | ヘリカルブローチおよびそれを用いた内歯車加工方法 |
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