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WO2002100570A1 - Filieres pour filetage ameliorees - Google Patents

Filieres pour filetage ameliorees Download PDF

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Publication number
WO2002100570A1
WO2002100570A1 PCT/US2002/017886 US0217886W WO02100570A1 WO 2002100570 A1 WO2002100570 A1 WO 2002100570A1 US 0217886 W US0217886 W US 0217886W WO 02100570 A1 WO02100570 A1 WO 02100570A1
Authority
WO
WIPO (PCT)
Prior art keywords
die
thread
top edge
ridges
thread rolling
Prior art date
Application number
PCT/US2002/017886
Other languages
English (en)
Inventor
Michael R. Caton
Marcelino Ceniceros
Michael L. RUNYON
Original Assignee
Fairchild Holding Corp.
Walton-Runyon, Michele
RUNYON, Lisa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US10/071,115 external-priority patent/US20020112524A1/en
Application filed by Fairchild Holding Corp., Walton-Runyon, Michele, RUNYON, Lisa filed Critical Fairchild Holding Corp.
Publication of WO2002100570A1 publication Critical patent/WO2002100570A1/fr

Links

Classifications

    • 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

  • This invention relates generally to improvements in thread roll dies and more particularly to improvements in the design of roll dies that reduces scrap and produces better fasteners.
  • the function of placing threads on a bolt by the use of thread rolling dies is old in the art.
  • the thread transition zone also known as a runout area, is the area defined by the distance from the last foil thread to the beginning of the shank or grip section of the bolt. In normal bolt thread rolling practice, this length of thread dissipation is approximately 2 thread pitches long.
  • the reduction in transition zone has proved very useful. Reduced transition zone is desirable because it saves weight, shortens the thread transition zone by reducing the overall thread length, and does not deteriorate the performance.
  • U. S. Patent Nos. 4,735,537, 4,842,466, 4,915,559, and 5,039,265 and other similar designs have been successful in reducing the thread transition runout area to well below 1 thread pitch length.
  • thread roll dies that incorporate the features of shortened thread transition length with a minimal occurrence of any unacceptable thread discrepancies. It is also desirable to have these dies produce less stress and strain rate in the thread transition area of the bolt.
  • the present invention is directed at an improved thread rolling die, comprising a flat parallel longitudinal top edge and bottom edges, flat tapered die ends, and a vertical face that is used in producing the thread.
  • Formed on the face is a series of parallel ridges which include a plurality of flanks positioned at a pre-determined angle.
  • the ridges are complementary to the thread to be produced and are at an acute angle relative to the top and bottom edges.
  • the ridges are configured for producing a thread helix when a blank is rolled between a set of dies.
  • the die further comprises a stepped beveled surface which forms a part of the top edge located between the top edge surface of the die and the vertical face; the beveled surface is positioned at a pre-determined angle relative to the top edge surface.
  • the ridges that intersect the stepped beveled surface have ends, that are positioned at a pre-determined angle to the top edge of the die and extend to the stepped beveled surface.
  • the ends blend smoothly into substantially flat surfaces which extend to the top edge surface of the die such that the substantially flat surfaces are positioned at an angle less than 60 degrees from the face of the die.
  • the ends of the improved die lead away at a 60 degree angle from the top edge of the die and are approximately at a 30 degree angle from the top edge of the die.
  • the new design embodying the present invention minimizes the negative effects and still continues to reduce the distance of a dimensionally full thread acceptably close to the grip section.
  • This feature is accomplished by changing the fabrication of the thread roll dies by having the flat narrow surfaces at an angle of less than 60 degrees from the vertical face of the die, rather than being perpendicular to the longitudinal axes of the ridges of the prior art.
  • the improvement in the design further includes the top edge of the die leading to the ends of the vertical face of the die and leading away from at a 60 degree angle from the top surface of the die. Additionally, the improvement modifies the ends and angles it approximately 30 degrees from the perpendicular position to create smoother threads.
  • the stationary die and the moving die are capable of producing less stress and strain in a thread transition area of a fastener and reducing substantial scrap during the manufacture of fasteners with specific dimensions.
  • the design not only reduces stress and strain rate in the thread transition area, but also permits a smooth engagement of a fastener blank between the stationary die and the moving die.
  • FIG. 1 is an enlarged fragmentary perspective view of a prior art movable die depicted in U.S. Patent No. 4,735,5637;
  • Figure 2 is an exemplary embodiment of an elevational view of a thread rolling stationary die made in accordance with the present invention
  • Figure 2a is an enlarged perspective view of the thread rolling die
  • Figures 2b and 2c are yet other enlarged perspective views of the thread rolling die depicting various features of the thread rolling die;
  • Figure 3 is a top view of the stationary die shown in Figure 2;
  • Figure 4 is a side view of the stationary die shown in Figure 2;
  • Figure 5 is an enlarged fragmentary elevational view of a selected portion 184 of the stationary die shown in Figure 2;
  • Figure 6 provides other related dimensions for the stationary die for various threads per inch fasteners;
  • Figure 7 is an exemplary embodiment of an elevational view of a thread rolling moving die made in accordance with the present invention
  • Figure 8 is a plan view of the thread rolling die shown in Figure 7;
  • Figure 9 is a side view of the thread rolling die shown in Figure 7;
  • Figure 10 is yet another elevational view of the moving die, respectively;
  • Figure 11 is yet another side view of the moving die;
  • Figure 12 is an enlarged fragmentary view illustrating a typical contour of a corner edge of the moving die.
  • Figure 13 provides exemplary various dimensions of the stationary die and the moving die and their corresponding face lengths, heights and taper lengths to manufacture the stationary and the moving die.
  • FIG. 1 Illustrated in Figure 1 (identified as Figures 5 in U.S. Patent No. 4,735,5637) is an enlarged fragmentary perspective view of a movable die 46.
  • the movable die 46 is identical in configuration to a stationary die (not shown).
  • the die 46 includes flat parallel longitudinal top and bottom edges 53 and 54, and a vertical face 55 which is used in producing the thread.
  • ridges 56 Formed on the face 55 is a series of parallel ridges 56 which are complementary to the thread to be produced, and therefore generally V-shaped in end elevation. In accordance with standard practice, these ridges include flanks 57 and 58 with a 60 degree included angle between them. The ridges 56 are at an acute angle relative to the top and bottom edges 53 and 54, appropriate for producing a thread helix when a screw blank is rolled between the dies.
  • a stepped, beveled surface 59 which forms a part of the upper die edge. This surface is at an angle of 25 degrees relative to the top edge surface 53. Accordingly, the stepped beveled surface 59 is at only a 5 degree differential with respect to the upwardly-facing flanks 57 of the ridges 56 that run out at the beveled surface 59. In practice, the beveled surface 59 is made to blend with the flanks 57 that it intersects. The vertical dimension of the beveled surface 59 should be equal to at least twice the pitch of the thread to be produced in order to assure adequate clearance as the thread is formed.
  • the ridges 56 that intersect the stepped beveled surface 59 have relatively abrupt ends 60.
  • the ridges 56 have their full cross-sectional dimension, symmetrical on either side of their longitudinal axes, at a location close to where they terminate.
  • the only runout of the ridges is provided by the transverse rounded ends 60, which are generally symmetrical about the ridge axes. Preferably, this runout does not exceed one-fourth of the circumference of the thread to be produced at its pitch diameter.
  • the rounded ends 60 of the ridges 58 that extend to the surface 59 blend smoothly into flat, narrow surfaces 61 which extend to the top edge 53 surface of the die. This results in the stepped configuration of the beveled surface 59, dividing it into segments, each of which connects to the flank 57 of one of the ridges 56.
  • the narrow surfaces 61 are transverse with respect to the ridges 56, and are perpendicular to the longitudinal axes of the ridges.
  • the spacing between the ridge ends 60 is set such that there is an increase in height from one to the next from the die end 62, where the thread rolling begins, to the opposite end 63.
  • Figures 2 and 7 are exemplary embodiments of elevational views of a thread rolling stationary die 90 and a thread rolling moving die 100 respectively made in accordance with the present invention.
  • the dies of this invention are operated as conventional dies, with the one die 90 being moved longitudinally relative to the other die 100.
  • a screw blank is positioned between the dies to produce the screw.
  • Figures 3 through 6 and 8 through 12 depict various different sectional views of the stationary die 90 and the moving die 100.
  • Figure 13 in particular, identifies various dimensions of the stationary die 90 and the moving die 100 and their corresponding face lengths, heights and taper lengths to manufacture the stationary and the moving die.
  • the dimensions shown in Figure 13 are exemplary only, and changes and modifications can be made therein which are within the full intended scope of the invention as herein described and claimed.
  • the thread rolling stationary die 90 has a flat parallel longitudinal top edge and bottom edge 102 and 104 respectively, and flat taper die ends 112 and 114 forming a pre-determined angle 116 at both ends of the die.
  • the taper die ends 112 and 114 are tapered relatively at a same angle with reference to a central axis 115 thereby forming a trapezoid shape of the die in conjunction with the vertical face 118 and another vertical parallel face (not shown).
  • the pre-determined angle 116 is approximately 10 degree.
  • the die 90 also includes a vertical face 118 that is used in producing the thread.
  • Radii 119 is tangent at " Y" and "L" shown in Figure 2 to help produce a fastener with a low strain rate.
  • dies 90 and 100 are produced from a flat die material having a strength of A.I.S.I. M42. The die material is heat treated and stress relieved. As described above, Figure 2 is an elevational view of the thread rolling stationary die 90.
  • Figure 3 is a top view and Figure 4 is a side elevational view of the stationary die 90.
  • Typical dimensions of the stationary die 90 for various different machine sizes are summarized in Figure 13.
  • the stationary die 90 includes the longitudinal top edge 102 having a length (F) of 4.250 inch and the longitudinal bottom edge 104 having a base length
  • the die 90 also includes the vertical face 118 having a face width (J) of 1.500 inch, which has pre-determined number of ridges 120 complementary to the thread to be produced.
  • the vertical face 118 has a tapered length (K) of approximately 1.700 inch, and another tapered length (L) of 0.600 inch to permit a smooth engagement and disengagement of a fastener between the stationary die 90 and the moving die 100.
  • the die 90 also has the couple of taper ends 112 and 114 having a height (H) of 0.625 inch respectively.
  • Figure 6 provides other related dimensions for the stationary die 90 which includes various taper depth dimensions identified as "V, "W", and "Y” in Figure 2.
  • Figure 13 also provides exemplary dimensions 230 for the moving die 100 and the stationary die 90 for machine sizes
  • Figure 2a is an enlarged perspective view of the thread rolling die 90.
  • formed on the face 118 is a series of parallel ridges 120.
  • the ridges 120 include a plurality of flanks 127 and 128 and are positioned at a pre-determined angle 130.
  • the ridges 120 are complementary to the thread to be produced.
  • the ridges are at an acute angle relative to the top and bottom edges 102 and 104 and further configured for producing a thread helix when a blank is rolled between a set of the stationary die 90, shown in figure 2 and the moving die 100, shown in Figure 7.
  • a stepped beveled surface 144 which forms a part of the upper die edge, is located between the top edge surface 102 of the die and the vertical face 118.
  • the beveled surface 144 is positioned at a pre-determined angle relative to the top edge surface 102.
  • ends 160 that intersect the stepped beveled surface 144 have ends 160, which are positioned at a 60 degree angle to the top edge surface 102 of the die. Additionally, the ends 160 extend to the stepped beveled surface 144 and blend smoothly into the surfaces 162 which extend to the top edge surface 102 of the die such that the surfaces 162 are positioned at an angle less than 60 degrees from the vertical face 118 of the die.
  • Figures 2b and 2c are yet other enlarged perspective views of the thread rolling die 90 depicting the stepped beveled surface 144 having ends 160.
  • the ends 162 are positioned at a 60 degree angle to the top of the die 102.
  • the ends 160 extend to the stepped beveled surface 144 and blend smoothly into the surfaces 162 which extend to the top edge surface 102 of the die such that the surfaces 162 are positioned at an angle less than 60 degrees from the face 118 of the die.
  • the surfaces 162 are'transverse with respect to the ridges 120, being at approximately a 60 degree angle to the longitudinal axes of the ridges 120.
  • FIG 3 is an exemplary embodiment of a top view 170 of the stationary die 100 in accordance with the present invention.
  • Top view 170 displays the vertical face 118 of the die in addition to the flat tapered die ends 112 and 114 with a face width 172 ofthe die at both the ends.
  • a length of notch 174 at a start end of both dies 90 and 100 is of a pre-determined length to ensure smooth engagement and disengagement between the dies and a blank.
  • Figure 4 is an end view 180 ofthe stationary die 90.
  • the end view 180 shows a height 182 ofthe stationary die 90.
  • Figure 5 is an enlarged fragmentary elevational view of a portion 184 ofthe stationary die 90, shown in Figure 2.
  • the portion 184 shows an enlarged view of a taper depth 188.
  • the taper depth dimension 164 for the stationary die 90 are the same as the taper depth dimension 165 of the moving die 100 for a given size of the fastener.
  • Exemplary dimensions ofthe typical tapered depths 164, 165 and a depth 166 in relation to threads per inch 167 produced by various dies are shown in Figure 6. Additionally, the enlarged view shown in
  • Figure 5 depicts that the ends 160 extend to the stepped beveled surface 144 and blend smoothly into the surfaces 162 which extend to the top edge surface 102 ofthe die such that the surfaces 162 are positioned at a pre-determined angle 186.
  • the pre-determined angle 186 is an approximate angle of 30 degrees.
  • Figure 7 is an exemplary embodiment of an elevational view ofthe thread rolling moving die 100 made in accordance with the present invention.
  • Figure 8 is a top view and Figure 9 is a side view of the moving die 100. Typical dimensions of the moving die 100 for various different machine sizes are summarized in Figure 13.
  • the moving die 100 includes a longitudinal top edge 202 having a length (A) of 5.000 inches and a longitudinal bottom edge 204 having a base length (B) of 5.110 inches.
  • the longitudinal top edge 202 and the longitudinal bottom edge 204 are substantially parallel.
  • the die 100 also includes a vertical face 218 having a face length (D) of 1.500 inches, which has pre-determined number of ridges 220 complementary to the thread to be produced.
  • the vertical face 218 has a tapered length (E) of approximately 4.000 inches to permit a smooth engagement and disengagement of a fastener between the moving die 100 and the stationary die 90.
  • the die 100 also has a couple of taper ends 224 and 226 each having a height (C) of 0.625 inch.
  • Figure 13 provides exemplary dimensions 230 for the moving die 100 and the stationary die 90 for machine sizes 20 and 30.
  • Figures 10 and 11 are yet other elevational and side views of the moving die 100. Although, the detail discussions relate to moving die 100, the principles underlying these discussions are equally applicable to stationary die 90. As illustrated in Figure 7 above, the die 100 has a couple of taper ends 224 and 226. The taper ends 224 and 226 are tapered approximately 10 degrees towards a central axis 240 ofthe die. The tapered ends 224 and 226 provide smooth engagement and disengagement with the fastener.
  • Figure 12 is an enlarged fragmentary view illustrating a typical contour of a corner edge ofthe die.
  • Figure 12 also exemplifies the configuration ofthe ridges 120.
  • the ridges 120 that intersect the stepped beveled surface 144 (shown in Figure 2a) have relatively smooth ends 160 which preferably are convexly rounded with compound curvature.
  • the ridges 120 have their full cross-sectional dimension, symmetrical on either side of their longitudinal axes, at a location close to where they terminate.
  • the only runout ofthe ridges is provided by the transverse rounded ends 160, which are generally symmetrical about the ridge axes.
  • the 15 degree angle applies from the beginning of notch and radius along the root radius until it runs out at the edge ofthe die.
  • the new design embodying the present invention and described in Figures 2 through 13 minimizes the negative effects and still continues to reduce the distance of a dimensionally full thread acceptably close to the grip section.
  • This feature is accomplished by changing the fabrication ofthe thread roll dies by having the faces 162 at an angle of less than 60 degrees from the vertical face 118 ofthe die, rather than being perpendicular (as shown in Figure 1) to the longitudinal axes of the ridges of the prior art.
  • the prior art depicts a radius 60 • (shown in Figure 1) as the thread transitions from the vertical face 118 ofthe die to the 90 degree angle with sharp corners on the top thread leading to radius 60 and leaving radius 60 on top of the die.
  • the improvement in the design not only radiuses at this point (which is designated as a referenced numeral 160 in Figures 2a, 2b, and 2c), but also the top edge 102 leading to the ends 160 ofthe face 118 ofthe die and leading away at a 60 degree angle from the top surface 102 of the die.
  • the prior art further illustrates that the face 60 (shown in Figure 1) is leading away from the face 55 of die (shown in Figure 1) and is perpendicular to the flat surface 53 (shown in Figure 1) ofthe top ofthe die.
  • the improvement modifies the surface 160 and angles it approximately 30 degrees from the perpendicular position. This arrangement is exemplified in Figures 2, 2a, 2b, and 2c above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne une filière pour filetage (9) améliorée, comprenant des bords supérieur et inférieur (102, 104) plats, parallèles et longitudinaux, des extrémités (112, 114) plates coniques et une face verticale (118) utilisée pour produire un filet. Une série de saillies parallèles (120) comprenant une pluralité de flancs (127, 128) positionnés selon un angle prédéterminé sont formées sur une face. Lesdites saillies sont complémentaires du filet à produire, et forment un angle aigu par rapport aux bords supérieur et inférieur (102, 104). Ces saillies sont configurées de façon à produire une hélice filetée lorsqu'on fait tourner une ébauche entre un ensemble de filières. Lesdites filières possèdent des surfaces étroites (162) plates disposées selon un angle inférieur à 60 degrés qui partent de la face verticale de la filière au lieu d'être perpendiculaire à l'axe longitudinal des saillies, le bord supérieur de la filière menant aux extrémités de la face verticale de ladite filière et s'écartant de sa surface supérieure selon un angle de 60 degrés. Les extrémités (162) de la filière sont positionnées approximativement à 30 degrés de la position perpendiculaire afin de créer des filets plus réguliers.
PCT/US2002/017886 2001-06-07 2002-06-07 Filieres pour filetage ameliorees WO2002100570A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US29662601P 2001-06-07 2001-06-07
US60/296,626 2001-06-07
US10/071,115 2002-02-07
US10/071,115 US20020112524A1 (en) 2001-02-16 2002-02-07 Thread roll dies

Publications (1)

Publication Number Publication Date
WO2002100570A1 true WO2002100570A1 (fr) 2002-12-19

Family

ID=26751851

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/017886 WO2002100570A1 (fr) 2001-06-07 2002-06-07 Filieres pour filetage ameliorees

Country Status (2)

Country Link
TW (1) TW561078B (fr)
WO (1) WO2002100570A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2941507A1 (fr) * 2009-01-29 2010-07-30 Lisi Aerospace Filetage a distribution de contraintes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6894592B2 (ja) * 2017-04-28 2021-06-30 若井ホールディングス株式会社 自穿孔ねじの転造ダイス

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2303224A (en) * 1938-08-27 1942-11-24 Illinois Tool Works Method and means for assembling screws and lock washers
US2951283A (en) * 1957-03-08 1960-09-06 Pipe Plugs Inc Method of repairing thread rolling dies
US3260100A (en) * 1963-07-30 1966-07-12 Illinois Tool Works Apparatus for simultaneously imparting an alternate series of thread forms on a workpiece
US4735537A (en) * 1986-01-13 1988-04-05 Deutsch Fastener Corp. Thread rolling and fastener
US4798070A (en) * 1983-07-01 1989-01-17 Colt Industries Operating Corporation Combined thread rolling dies
US4862718A (en) * 1988-07-14 1989-09-05 Sps Technologies, Inc. Thread rolling dies

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2303224A (en) * 1938-08-27 1942-11-24 Illinois Tool Works Method and means for assembling screws and lock washers
US2951283A (en) * 1957-03-08 1960-09-06 Pipe Plugs Inc Method of repairing thread rolling dies
US3260100A (en) * 1963-07-30 1966-07-12 Illinois Tool Works Apparatus for simultaneously imparting an alternate series of thread forms on a workpiece
US4798070A (en) * 1983-07-01 1989-01-17 Colt Industries Operating Corporation Combined thread rolling dies
US4735537A (en) * 1986-01-13 1988-04-05 Deutsch Fastener Corp. Thread rolling and fastener
US4862718A (en) * 1988-07-14 1989-09-05 Sps Technologies, Inc. Thread rolling dies

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2941507A1 (fr) * 2009-01-29 2010-07-30 Lisi Aerospace Filetage a distribution de contraintes
WO2010086538A1 (fr) * 2009-01-29 2010-08-05 Lisi Aerospace Vis ou ecrou presentant un filetage dont un pas varie et outils pour realiser une telle vis ou un tel ecrou
US9352382B2 (en) 2009-01-29 2016-05-31 Lisi Aerospace Screw or nut with a thread a pitch of which varies and tool to produce said screw or nut

Also Published As

Publication number Publication date
TW561078B (en) 2003-11-11

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