WO2015125836A1 - 両ねじ体転造用ダイス構造、両ねじ体転造方法、両ねじ体転造用ねじ素材 - Google Patents

両ねじ体転造用ダイス構造、両ねじ体転造方法、両ねじ体転造用ねじ素材 Download PDF

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Publication number
WO2015125836A1
WO2015125836A1 PCT/JP2015/054488 JP2015054488W WO2015125836A1 WO 2015125836 A1 WO2015125836 A1 WO 2015125836A1 JP 2015054488 W JP2015054488 W JP 2015054488W WO 2015125836 A1 WO2015125836 A1 WO 2015125836A1
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WIPO (PCT)
Prior art keywords
screw
region
rolling
portion forming
die member
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PCT/JP2015/054488
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English (en)
French (fr)
Japanese (ja)
Inventor
裕 道脇
Original Assignee
株式会社ＮｅｊｉＬａｗ
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Application filed by 株式会社ＮｅｊｉＬａｗ filed Critical 株式会社ＮｅｊｉＬａｗ
Priority to KR1020167025315A priority Critical patent/KR20160120765A/ko
Priority to CN201580020298.5A priority patent/CN106232258B/zh
Publication of WO2015125836A1 publication Critical patent/WO2015125836A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/06—Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other
    • B21H3/065—Planetary thread rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/04—Making by means of profiled-rolls or die rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/06—Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other

Definitions

  • the present invention relates to a rolling die structure and the like for efficiently and stably producing both screw bodies having a right screw portion and a left screw portion on the same region in the axial direction of the screw portion by rolling. .
  • a screw material that is a metal cylindrical rod-like body also called a blank is formed with a plurality of strips. While pressing with a die member that becomes a plurality of rigid flat plates, rigid cylinders or rigid cylinders on the surface, the screw material and the die member are relatively displaced to form a screw thread or a screw groove while plastically deforming the screw material surface. It is common.
  • the strips formed on the die member are formed in a state where the cross section is formed in a desired shape, for example, a substantially triangular shape, substantially parallel to each other, and having a lead angle.
  • both threaded bodies having a right threaded part and a left threaded part on the same region in the axial direction of the threaded part of the male threaded body are known, and attempts have been made to produce this by rolling. (See JP 2013-43183 A).
  • the present invention solves the problems as described above, that is, a rolling die structure and a rolling method capable of mass production of a single screw portion and a double screw body having both screw portions with high accuracy and efficiency.
  • the purpose is to provide.
  • the means adopted by the die structure for rolling both screw bodies includes a die member having a rigid surface that is relatively displaced while being pressed against the screw material, and the die member is formed on the surface of the die member. Both of which are formed in a substantially parallelogram shape in the normal direction view of the virtual surface obtained by connecting the outermost portions, and a plurality of concave portions recessed from the virtual surface are arranged along the relative displacement direction.
  • a thread portion forming region and a valley portion that is arranged adjacent to the both thread portion forming regions in a state shifted in the axial direction of the screw material, extends in a band shape on the virtual surface, and is recessed from the virtual surface.
  • a single threaded portion forming region that is inclined with respect to the relative displacement direction by the lead angle.
  • the die member can be divided at a boundary between the both screw portion forming region and the single screw portion forming region.
  • the die member can be divided at a boundary in the middle of the axial direction in the one screw portion forming region.
  • the die member includes a cylindrical part forming region that is disposed adjacent to the one screw part forming region in a state of being shifted in the axial direction of the screw material, and has a planar shape. It is possible to divide at the boundary between the forming region and the single screw portion forming region.
  • the screw material has a double screw corresponding region corresponding to the double screw portion forming region of the die member and a single screw corresponding region corresponding to the single screw portion forming region of the die member.
  • the cross-sectional area of the one-thread-corresponding region is set larger than the cross-sectional area of the two-thread-corresponding region.
  • a region in which the arrangement pitch of the concave portions in the screw portion forming regions in the relative displacement direction is set smaller from the upstream side to the downstream side when the relative displacement with the screw material is performed. It is characterized by having.
  • the maximum dimension of the plurality of recesses in the direction of relative displacement is set to be smaller in order of arrangement from the upstream side to the downstream side.
  • the distance between the central axis of the screw material and the virtual surface is set to be smaller from the upstream side to the downstream side where the screw material is relatively displaced in the both screw part forming regions.
  • the die member gradually approaches the axis of the screw material along the direction of relative displacement on the virtual surface obtained by connecting the outermost portions of the surface, A precursor processing region having a region gradually separating from the axis is provided.
  • At least a part of the precursor processing region in the die member is present on the upstream side when the screw material is relatively displaced with respect to the both screw forming regions.
  • the precursor processing region and the both screw portion forming regions in the die member are independently arranged.
  • the arrangement pitch of the plurality of concave portions arranged linearly along the direction of relative displacement in the both screw forming regions is different from the approaching region and the separation in the precursor processing region. It is characterized by being set to an integral multiple of the pitch between the areas to be processed.
  • the means adopted by the both-screw rolling method is that when the die member having a rigid surface is relatively displaced with respect to the screw material, the die member moves between the outermost surfaces of the surface.
  • a threaded portion forming region having a substantially parallelogram shape in a normal direction view of the virtual surface obtained by connecting, and a plurality of concave portions recessed from the virtual surface being arranged in a plurality along the relative displacement direction.
  • a valley portion that is disposed adjacent to the two threaded portion forming regions in a state of being shifted in the axial direction of the screw material, extends in a band shape on the virtual surface, and is recessed from the virtual surface.
  • the die member can be divided at a boundary between the both screw portion forming region and the single screw portion forming region.
  • the die member can be divided at a boundary in the middle of the axial direction in the one screw portion forming region.
  • the screw material has a double screw corresponding region corresponding to the double screw portion forming region of the die member and a single screw corresponding region corresponding to the single screw portion forming region of the die member.
  • the cross-sectional area of the one-thread-corresponding region is set larger than the cross-sectional area of the two-thread-corresponding region.
  • the means adopted by the screw material for rolling both screw bodies is a double screw body having both screw regions and one screw regions by a die member having both screw portion forming regions and one screw portion forming regions.
  • a screw material used when rolling the die material wherein the screw material corresponds to a both screw corresponding region corresponding to the both screw part forming region of the die member and to the one screw part forming region of the die member. It has a single screw corresponding region, and the cross sectional area of the single screw corresponding region is set larger than the cross sectional area of the two screw compatible regions.
  • FIG. 1 shows an outline of a die structure for rolling both screw bodies and a rolling method employed in an embodiment of the present invention
  • (A) is flat die rolling
  • (B) is rolling rolling
  • (C) is It is a figure which shows planetary rolling.
  • (A) is a front view showing a die member having the same die structure
  • (B) is a side view
  • (C) is an exploded view.
  • (A) is a front view explaining arrangement
  • (B) is a figure which shows the deformation
  • FIG. 3 is an enlarged sectional view showing a sectional shape of the concave portion.
  • FIG. 1 It is a front view explaining the arrangement
  • A is a figure which shows the application example of rolling rolling
  • B is a figure which shows the application example of planetary rolling.
  • or (C) is a side view which shows the process of processing a screw raw material by the precursor process area
  • A) is a side view showing a part of both screw bodies in an enlarged manner
  • FIG. (A) is a side view showing a part of both screw bodies in an enlarged manner
  • (B) is a sectional view showing a cross-sectional area of a crossing portion of screw threads in both screw regions
  • (C) the both screw bodies.
  • FIG. (A) is the front view and side view which show the other structural example of the dice
  • (B) is an example of the both screw body D rolled by this It is a side view to show
  • (C) and (D) is a front view showing another configuration example of the screw material B.
  • the die structure for rolling both screw bodies deforms the surface of the screw material B while being pressed against the cylindrical screw material B and relatively displaced in a direction orthogonal to the axial direction of the screw material B, It is for rolling both screw bodies D which have a right-hand thread part and a left-hand thread part on the same area
  • the rolling die structure of the present embodiment includes two or more die members 10 that are pressed against the screw material B, and each die member 10 has a rigid surface 20. While these two or more die members 10 are pressed against the screw material B, the rigid surfaces 20 thereof are displaced relative to each other and at the same time relative to the screw material B.
  • the rigid surface 20 of the die member 10 has a concave surface 30 on a virtual surface 22 obtained by connecting the outermost portions of the rigid surface 20 (portions that are closest to the screw material B).
  • a plurality of threaded portion forming regions U provided in a plurality of independently aligned manners are provided.
  • the concave portions 30 of both screw portion forming regions U have a substantially parallelogram shape when viewed in the normal direction, and are recessed from the virtual surface 22 as shown in FIG.
  • the virtual surface 22 has a planar shape in the case of the plate-shaped die member 10, a cylindrical surface shape in the case of the round die shape, and a partial cylindrical surface (arc surface) shape in the case of the arc-shaped die shape. It is desirable to set to.
  • Each recess 30 is formed in a substantially parallelogram shape in a normal direction view of the virtual plane 22, and preferably has a substantially rhombus shape. Thus, if it sets to a substantially rhombus shape, each screw pitch in the right-hand thread part and left-hand thread part of the both screw bodies D to be rolled can be made equal to each other.
  • Each of these concave portions 30 is formed such that two or more corner portions 31, 31 of the substantially parallelogram-shaped four-corner corresponding portions in the normal direction view are rounded in the normal direction view as shown in FIG. Is done.
  • all the corners 31, 31, 32, 32 of the substantially parallelogram-shaped four-corner corresponding portion are rounded.
  • the two or more corner portions 31, 31 are preferably set in a diagonal position, and in particular, the direction in which the screw material B rolls, that is, the relative displacement, of the two or more corner portions 31, 31 is preferable. If it is set as a diagonal position in the direction of, it is preferable that the facet generated during rolling is likely to flow out of the recess 30 during relative displacement.
  • the concave portion 30 has a virtual substantially quadrangular pyramid-shaped hole shape with the opening surface as one constituent surface, and the central top portion of the substantially quadrangular pyramid shape forms the deepest portion 34 of the concave portion 30. . More preferably, the shape is such that the deepest portion 34 of the recess 30 has a substantially flat bottom 35. By doing so, the bottom 35 is widened, and it is easy to flow out without clogging the generated facet, and the highest peak of the thread M of both screw bodies D does not form an acute angle in the direction perpendicular to the axis of both screw bodies D. Therefore, the stability when the female screw body is screwed to the both screw bodies D can be improved. Moreover, the product precision of the both screw bodies D obtained by mass production can be remarkably improved.
  • FIG. 3B when the screw blank B is rolled from the upstream side to the downstream side on the two screw part forming regions U, the shaft part E excluding the thread M is gradually formed.
  • the outer peripheral distance of the shaft E when assuming a perfect circle, the diameter ⁇ ⁇ ) gradually decreases toward the downstream, and finally becomes a substantially perfect circle shape. Accordingly, the rolling distance that is advanced by one rotation of the screw material B gradually decreases toward the downstream, and accordingly, the arrangement pitches T1, T2, T3,.
  • the concave portion 30 can always be pressed against the rolling thread material B at the same phase, and the shape accuracy of the thread M can be remarkably increased.
  • the arrangement pitches T1, T2, T3,... are gradually reduced over the entire area of both screw portion formation areas U is illustrated, but the arrangement is limited to a partial area in the relative displacement direction.
  • the pitches T1, T2, T3... May be gradually reduced.
  • the distances L1, L2, L3,. .. Is preferably made smaller from the upstream side where the screw material B is relatively displaced toward the downstream side. That is, L1> L2> L3>.
  • the arrangement pitches T1 and T2 in the direction in which the recesses 30 are relatively displaced are arranged. , T3... Can be further improved in the shape accuracy of the thread M.
  • 3A illustrates the case where the maximum dimension W in the direction of relative displacement is constant for all the recesses 30, but for example, as shown in FIG. It is also preferable to set the maximum dimensions W1, W2, W3... In the direction of relative displacement of the plurality of concave portions 30 so as to gradually decrease in the order of arrangement from the upstream side to the downstream side. That is, W1> W2> W3>.
  • the final shape of the screw thread M approximates the concave portion 30 on the most downstream side of both screw portion forming regions U.
  • the arrangement pitches T1, T2, T3,... Are larger on the upstream side than the most downstream side, there is a sufficient space, so the maximum dimensions W1, W2, W3,. Can be set.
  • the larger the same maximum dimensions W1, W2, W3, etc. of the recess 30 can increase the amount of plastic deformation of the screw material B. Therefore, the recess 30 on the upstream side is plastically deformed as quickly as possible. Rolling can be performed so as to approach the shape of the final thread M as it goes to the side.
  • these recesses 30 have a substantially parallelogram shape in which the peripheral portion 33 is rounded as in, for example, R processing in the cross-sectional shape along the normal direction of the virtual surface 22. It forms round along the circumference
  • this invention is not limited to this, For example, as shown to FIG 3 (D), you may make it trapezoid shape and can also make it V shape.
  • the substantially parallelogram-shaped concave portion 30 in the normal direction of the virtual surface 22 has at least one diagonal distance W among its diagonal lines, the radius of the screw blank B as R0, and the circumference.
  • the rate is ⁇ , it is set to be 2 ⁇ R0 or less.
  • the diagonal distance W of at least one of the diagonal lines of the substantially parallelogram forming the recess 30 is ⁇ d. R or less. More preferably, setting the diagonal distance of a diagonal line parallel to at least the relative displacement direction of the diagonal of the parallelogram forming the recess 30 in the following [pi] d R.
  • the opening of the recess 30 sets one diagonal distance of the substantially parallelogram in the normal direction of the virtual surface 22, preferably a relatively long diagonal distance W in the relative displacement direction.
  • the other diagonal distance, preferably the diagonal distance F in the direction orthogonal to the relative displacement direction is set to be relatively short.
  • the concave portion 30 has a volume v of the concave portion 30, a circumferential ratio ⁇ , a concave pitch of the concave portions 30 in a direction orthogonal to the direction of relative displacement of the die member 10, and a valley diameter of both screw bodies D. R (see FIG.
  • the setting range of the volume v of the recess 30 is defined by ⁇ pd R h / 7 ⁇ v ⁇ ⁇ pd R h / 5. It is preferable to configure so that. If it is set to be smaller than this range, the thread M is too thin, becomes too small and the strength is insufficient, or when the female screw body is screwed into the both screw bodies D which are male screws obtained by the practice of the present invention. The play becomes too big and the backlash becomes too big.
  • the thread M will be too thick or too large, and play will be reduced when the female screw body is screwed into the both screw bodies D, which are male screws obtained by the practice of the present invention. After that, it becomes difficult to screw or cannot be screwed, or it is difficult to roll the thread M with high accuracy.
  • the size of the concave portion 30 is changed as shown in FIG. 4, it is preferable to change the size within a range satisfying the condition of the volume v.
  • the rigid surface of the die member has a precursor processing region on the virtual surface 22 obtained by connecting the outermost portions (portions closest to the screw material B) of the rigid surface.
  • This precursor processing region is for processing into a precursor cross-sectional shape (hereinafter referred to as a substantially elliptical shape) such as an elliptical or oval cross-sectional shape, for example, and both screws following this In the part forming region U, a precursor shape for facilitating the formation of both screw parts is formed.
  • the rigid surface 20 of the die member 10 that processes the precursor cross-sectional shape into a substantially elliptical shape has a precursor processing region Q on the virtual surface 22 as shown in FIG.
  • the precursor processing region Q gradually approaches the axis E1 of the screw material B while maintaining the surface state of the virtual surface 22 along the direction of relative displacement with the screw material B.
  • the approaching region Q1 that repeats and the separation region Q2 that gradually separates from the axis E1 are repeated.
  • the process of compressing the screw material B, which initially has a circular shape in cross section, in the approach region Q1 is repeated in the same phase.
  • the cross section is non-circular having a major axis and a minor axis.
  • the projections and depressions may have a trapezoidal cross section, or may be sawtooth-like projections and depressions.
  • the precursor processing region Q in the die member 10 exists on the upstream side when the screw material B is relatively displaced with respect to both screw portion forming regions U.
  • the precursor processing region Q and both screw portion forming regions U are disposed independently. If it does in this way, before the screw raw material B approachs into both the thread part formation area
  • the deformation pitch between the approach region Q1 and the separation region Q2 in the precursor processing region Q with respect to the arrangement pitch PU of the plurality of recesses 30 arranged on a straight line along the direction of relative displacement in both screw portion formation regions U PQ is set to an integral multiple thereof, here four times.
  • the parallelograms are arranged in an oblique lattice shape
  • the recesses 30 have a lattice pitch PX of the plurality of recesses 30 arranged in a zigzag shape, which is a half of the arrangement pitch PU of the recesses 30 arranged on a straight line. Become one.
  • phase of the deformation pitch PQ and the phase of the arrangement pitch PU are in agreement between the precursor processing region Q and both screw portion forming regions U adjacent thereto. If it does in this way, rolling of the screw raw material B to the both thread part formation area
  • region Q will be performed smoothly.
  • the screw material B in the precursor processing region Q upstream of the two screw portion forming regions U, has a long axis at a location where it can be the highest peak of the future screw thread M.
  • the amount of plastic deformation of the screw material B can be reduced in the two screw part forming regions U.
  • the precursor processing region Q and both screw portion forming regions U are integrally disposed on the die member 10, and the deformation pitch PQ (short axis and long axis pitch) of the precursor processing region Q and both screws
  • the phase of the highest peak of the thread in the part forming region U and the pitch of the intersecting part (a quarter of the array pitch PU) are matched.
  • the rigid surface 20 of the die member 10 has a single screw portion forming region J that is disposed adjacent to the both screw portion forming regions U in a state of being displaced in the axial direction of the screw material B.
  • a trough 50 extending in a band shape with respect to the virtual surface 22 is recessed, and this trough 50 allows the single screw region of both screw bodies D in FIGS. Roll thread.
  • the valley 50 may be disposed so as to be inclined by the lead angle with respect to the direction in which the screw material B is relatively displaced.
  • the die member 10 can be divided as a part at the boundary between the both screw portion forming region U and the single screw portion forming region J.
  • Both screw bodies D need to change the length of the single screw region according to the specification. If the die member 10 is made separable, the length of the single screw region of both screw bodies D can be easily changed by replacing only the part corresponding to the single screw portion forming region J with a different axial width. it can.
  • both the thread part formation area U can also be easily replaced as a part, the shape of the thread M of the both thread part formation area U can be changed, or both the thread part formation area U and the single thread part formation area J can be changed.
  • the die member 10 can be divided into three component pieces J1, J2, and J3 at the boundary in the axial direction in the single screw portion forming region J. In this way, for example, a large number of component pieces having an axial width of 5 mm are prepared, and the axial width of the single screw portion forming region J can be freely adjusted in units of 5 mm depending on the number of connected component pieces. It is also possible to apply this idea to both screw portion forming regions U.
  • the rigid surface 20 of the die member 10 is a planar cylinder (column) that is arranged adjacent to the single threaded portion forming region J in a state shifted in the axial direction of the screw material B.
  • the portion forming region K may be provided.
  • the cylindrical portion forming region K rolls the cylindrical region of the both screw bodies D of FIGS. 7 and 8.
  • FIG. 2C the boundary between the cylindrical portion forming region K and the single screw portion forming region J can be divided. In both screw bodies D, it is necessary to change the length of the cylindrical region according to the specifications. In this way, if the die member 10 is replaced with a part corresponding to the cylindrical portion forming region K having a different axial width, the length of the cylindrical region of both screw bodies D can be easily reduced. Can be changed.
  • the die member 10 may be further divided as a component piece at an intermediate boundary in the axial direction in the cylindrical portion forming region K.
  • a large number of component pieces in the cylindrical portion forming region K having an axial width of 5 mm are prepared, and the axial width of the cylindrical portion forming region K can be freely set in units of 5 mm depending on the number of connected component pieces. Can be adjusted.
  • the rolling method of both screw bodies D using the rolling die structure of this embodiment is relatively displaced in a direction perpendicular to the axial direction of the screw material B while being pressed against the cylindrical screw material B. Then, the surface of the screw material B is deformed to roll the both screw bodies D having the right screw portion and the left screw portion on the same region in the axial direction.
  • one flat die member 10 is fixed and the distance between the outermost surfaces is fixed thereto.
  • the other flat die member 10 is arranged so as to be a predetermined distance d, and the other flat die member 10 is relatively displaced while maintaining the distance d.
  • these flat die members 10 and 10 may be configured so that both flat die members 10 and 10 are displaced relative to each other, and both of them may be displaced in alternate directions, and the distance d is also constant.
  • the flat die members 10 may be disposed somewhat inclined.
  • the arrangement pitches T1, T2, T3,. -Is reduced from the upstream side to the downstream side when the screw material B is relatively displaced. That is, T1> T2> T3>.
  • T1> T2> T3> As shown in FIG. 3 (B), when the screw material B is rolled from upstream to downstream on both screw portion forming regions U, a shaft portion E excluding the thread M is gradually formed. The outer peripheral distance of the shaft E (when assuming a perfect circle, the diameter ⁇ ⁇ ) gradually decreases toward the downstream, and finally becomes a substantially perfect circle shape.
  • the rolling distance that is advanced by one rotation of the screw material B gradually decreases toward the downstream, and accordingly, the arrangement pitches T1, T2, T3,. If it is set so as to become smaller toward the downstream, it becomes possible to always press the concave portion 30 with the substantially same phase against the rolling screw material B, and the shape accuracy of the thread M is remarkably improved. I can do it.
  • the distance L1, L2, L3 Between the central axis E1 of the screw material B and the virtual surface 22 is upstream where the screw material B is relatively displaced. It can also be reduced from the side toward the downstream side. In that case, the virtual surfaces 22 of the pair of opposed flat die members 10 may be set non-parallel so that the distance from each other gradually decreases in the direction in which the screw material B rolls.
  • the maximum dimensions W1, W2, W3,... can also be set so as to gradually decrease in the order of arrangement toward the downstream side. That is, W1> W2> W3>.
  • the final shape of the screw thread M approximates the concave portion 30 on the most downstream side of both screw portion forming regions U.
  • the arrangement pitches T1, T2, T3,... Are larger on the upstream side than on the most downstream side, there is a space, so the maximum dimensions W1, W2, W3,. it can.
  • the larger the same maximum dimensions W1, W2, W3, etc. of the recess 30 can increase the amount of plastic deformation of the screw material B. Therefore, the recess 30 on the upstream side is plastically deformed as quickly as possible. Rolling can be performed so as to approach the shape of the final thread M as it goes to the side.
  • the two round die members 12, 12 are The rotating shafts are held in parallel so that the distance between the outermost surfaces is a predetermined distance d. Then, each of them can be rotated while maintaining the distance d. At this time, the respective round die members 12, 12 may be reversely rotated or rotated in the same direction.
  • the screw material B relatively displaces the distances L1, L2, L3... Between the central axis E1 of the screw material B and the virtual surface 22 in both screw portion forming regions U. The size can be reduced from the upstream side toward the downstream side.
  • distances Y1 and Y2 between the virtual surface 22 on the inner peripheral side of the arc-shaped die member 13 and the center axis E1 of the cylindrical round die member 12 on the other side. , Y3... Are displaced so as to gradually become smaller in the circumferential direction. As a result, the distance from the virtual surface 22 of the counterpart cylindrical die member 12 gradually decreases in the direction of rolling of the screw material B.
  • the screw raw material B can be processed into an ellipse or an ellipse using the precursor process area
  • the screw material B before the screw material B enters the both screw part forming regions U, the screw material B is deformed into a substantially elliptical shape in advance.
  • the thread material B is a long axis at a place where it can be the highest peak of the future thread M, and the intersection of the future thread M It is deformed into a substantially elliptical shape so that the place where it can become a short axis.
  • the amount of plastic deformation of the screw material B can be reduced in the both screw portion forming regions U.
  • the precursor processing region Q and the both screw portion forming regions U are integrally disposed on the die member 10, and the deformation pitch PQ (short axis and long axis pitch) of the precursor processing region Q and both screws Ellipse or oval machining and thread machining are performed in a series of rolling operations while matching the phases of the highest peak of the thread in the part forming region U and the pitch of the intersection (a quarter of the arrangement pitch PU). Do it all together. As a result, it is possible to roll both screw regions with extremely high accuracy with extremely high work efficiency.
  • the rigid surface 20 of the die member 10 has a single screw portion forming region J that is disposed adjacent to the both screw portion forming regions U in a state of being displaced in the axial direction of the screw material B.
  • a trough 50 extending in a band shape with respect to the virtual surface 22 is recessed, and this trough 50 allows the single screw region of both screw bodies D in FIGS. Roll thread.
  • the valley 50 may be disposed so as to be inclined by the lead angle with respect to the direction in which the screw material B is relatively displaced.
  • the die member 10 can be divided as a part at the boundary between the both screw portion forming region U and the single screw portion forming region J. If the die member 10 is made separable, the length of the single screw region of both screw bodies D can be easily changed by replacing only the part corresponding to the single screw portion forming region J with a different axial width. it can.
  • the die member 10 can be divided into three component pieces J1, J2, and J3 at the boundary in the axial direction in the single screw portion forming region J, depending on the number of connection of these component pieces,
  • the axial width of the thread portion forming region J can be freely adjusted. It is also possible to apply this idea to both screw portion forming regions U.
  • the boundary between the cylindrical portion forming region K and the single screw portion forming region J can be divided.
  • both screw bodies D it is necessary to change the length of a cylindrical (or cylindrical) region according to the specifications. In this way, if the die member 10 is replaced with a part corresponding to the cylindrical portion forming region K having a different axial width, the length of the cylindrical region of both screw bodies D can be easily reduced. Can be changed.
  • the spacer region SP is disposed between the two screw portion forming regions U and the single screw portion forming region J on the rigid surface 20 of the die member 10.
  • This spacer region SP is set to a protruding amount corresponding to the root diameter of the both threaded bodies D to be rolled, so that some space is formed at the boundary between both threaded portion forming region U and one threaded portion forming region J. Plays the role of forming a gap.
  • a narrow width constricted portion V having a root diameter is formed between both screw regions and one screw region of both screw bodies D after rolling. Therefore, if the pitches of both the screws and the single screws are matched, the thread transition between the single screw region and the double screw region is smoothly performed.
  • the spacer region SP is disposed between the both screw portion forming region U and the single screw portion forming region J is illustrated here, in the precursor processing region Q (see FIG. 2) of the die member 10, It is also preferable to arrange the spacer region SP at the boundary corresponding to the forming region U and the single screw portion forming region J. In this way, as shown in FIG. 9C, a constricted portion V is formed in a so-called precursor in which the screw material B has passed the precursor processing region Q (this precursor can also be defined as a part of the screw material). Can be formed.
  • constricted portion V can be formed in the screw material B itself supplied to the die member 10 by a preliminary process.
  • the screw raw material B has illustrated the case where it becomes the same cross-sectional area over both the thread part formation area
  • this invention does this. It is not limited to.
  • the screw material B corresponding to the single screw portion forming region J is compared with the cross-sectional area of the both screw corresponding region BU of the screw material B corresponding to the both screw portion forming region U. It is preferable to set the cross-sectional area of the single screw corresponding region BJ large.
  • both screw regions and one screw region have the same root diameter, but the height of the thread is partially at both screw portions. Small.
  • the volume of the unit screw thread in both screw regions in both screw bodies D and the volume of the unit screw thread in the single screw region are larger in the single screw region. Therefore, it is preferable to provide a volume difference between the two screw corresponding region BU and the single screw corresponding region BJ of the screw material B by an amount corresponding to the volume difference between the screw threads of the two screws and the single screw.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Transmission Devices (AREA)
PCT/JP2015/054488 2014-02-18 2015-02-18 両ねじ体転造用ダイス構造、両ねじ体転造方法、両ねじ体転造用ねじ素材 WO2015125836A1 (ja)

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KR1020167025315A KR20160120765A (ko) 2014-02-18 2015-02-18 양나사체 전조용 다이스 구조, 양나사체 전조 방법, 양나사체 전조용 나사 소재
CN201580020298.5A CN106232258B (zh) 2014-02-18 2015-02-18 双螺纹体的滚制用滚牙轮结构、滚制方法及材料

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CN111085639A (zh) * 2020-01-19 2020-05-01 宾科汽车紧固件（昆山）有限公司 一种用于螺纹的成型机构及方法
CN116748430A (zh) * 2023-08-18 2023-09-15 杭州新剑机电传动股份有限公司 加工螺纹环槽滚柱的滚丝轮及螺纹环槽滚柱的加工方法

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JPH04175508A (ja) * 1990-07-13 1992-06-23 O S G Kk ねじ及びそれを形成するための転造ダイス
JPH0742724A (ja) * 1993-08-03 1995-02-10 Idea:Kk セルフロックボルト、その製造方法およびダイス
JP2001009638A (ja) * 1999-06-28 2001-01-16 Dandori Seisakusho:Kk ねじの製造方法及びねじ用ローリングダイス
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JP2007253198A (ja) * 2006-03-23 2007-10-04 Osg Corp 転造工具及びウォームとウォームに併存するスプラインとの同時転造方法
US20120328393A1 (en) * 2011-01-27 2012-12-27 Hilti Aktiengesellschaft Rolling die

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Publication number Priority date Publication date Assignee Title
CN111085639A (zh) * 2020-01-19 2020-05-01 宾科汽车紧固件（昆山）有限公司 一种用于螺纹的成型机构及方法
CN116748430A (zh) * 2023-08-18 2023-09-15 杭州新剑机电传动股份有限公司 加工螺纹环槽滚柱的滚丝轮及螺纹环槽滚柱的加工方法
CN116748430B (zh) * 2023-08-18 2023-11-07 杭州新剑机电传动股份有限公司 加工螺纹环槽滚柱的滚丝轮及螺纹环槽滚柱的加工方法

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CN106232258B (zh) 2019-02-01
JP6472121B2 (ja) 2019-02-20
TW201603907A (zh) 2016-02-01
KR20160120765A (ko) 2016-10-18
TWI640374B (zh) 2018-11-11
CN106232258A (zh) 2016-12-14

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