CN1325190C - Method and device for manufacturing bolt, screw rolling die used therefor, and multiple screw bolt - Google Patents
Method and device for manufacturing bolt, screw rolling die used therefor, and multiple screw bolt Download PDFInfo
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- CN1325190C CN1325190C CNB2004800079319A CN200480007931A CN1325190C CN 1325190 C CN1325190 C CN 1325190C CN B2004800079319 A CNB2004800079319 A CN B2004800079319A CN 200480007931 A CN200480007931 A CN 200480007931A CN 1325190 C CN1325190 C CN 1325190C
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- 238000005096 rolling process Methods 0.000 title claims abstract description 137
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 21
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Abstract
A method and a device for manufacturing bolts capable of mass-producing multiple screw bolts such as double screw bolts at low cost and a screw rolling die used therefor, the bolt manufacturing device comprising a pair of screw rolling dies (1) disposed opposite to each other at a specified interval and bolt supporting parts (2) supporting a cylindrical bolt material (3) at specified positions. The screw rolling dies (1) further comprise transfer patterns (4) having coarse screw thread ridge parts (5) as a part of the coarse screw threads formed by expanding a coarse screw and projections (6) as a part of fine screw threads (6a) cyclically formed at the thread root parts (5a) of the coarse screw threads according to the phase shift of the fine screw threads (6a) shown by imaginary lines formed by expanding a fine screw from the coarse screw threads.
Description
Technical field
The present invention relates to have the manufacture method and the manufacturing installation of the bolt that prevents lax function and be used in thread-rolling die and multi start thread bolt in this manufacturing installation.
Background technology
In recent years, research and development have the various bolts that prevent lax function with and manufacture method, for example, the world disclose No. 02/077466 brochure (below, be called " Patent Document 1 ") in the bolt of record, have: the regular screw threads portion of the pitch P that forms from the leading section of bolt axial region to specified part; And at least on the total length of the regular screw threads portion of bolt axial region or on the specified part from leading section to regular screw threads portion with the structure of the fine thread portion of the folded pitch p (p=P/n, n are the integer more than 2) that has formed of regular screw threads portion line.
In this bolt (so-called double thread bolt), make the regular screw threads portion of plain nut screw-threaded engagement bolt after, make serrated nut screw-threaded engagement fine thread portion and folded with this plain nut line, can make between bolt and two nuts and tighten.At this moment, serrated nut is different with the pitch of plain nut, and therefore if the two together rotates along same direction, then the contact-making surface between two nuts (composition surface) effect bounce can prevent that plain nut from rotating along lax direction.
In addition, put down in writing the manufacture method of relevant this double thread bolt in the Patent Document 1.This manufacture method, at first form the regular screw threads portion of pitch P to specified part from the leading section of bolt axial region by cutting, after this at least on the total length of the regular screw threads portion of bolt axial region or folded to the specified part and the regular screw threads portion line of regular screw threads portion from the leading section of bolt axial region, the fine thread portion of the pitch p that forms by cutting.
Summary of the invention
As mentioned above, by cutting formation regular screw threads portion, after this form the occasion of the fine thread portion of folding,, must carry out twice cutting process in order to make 1 double thread bolt with this regular screw threads portion line by cutting at first.In addition, after fold with the regular screw threads portion line that forms by the 1st cutting, carrying out cutting for the 2nd time formation fine thread portion, then online folded cutting place can produce overlap.Therefore must utilize wire brush to remove the operation of this overlap.
In addition, in Patent Document 1, mention, use conventional roller and closely-pitched roller to utilize the scheme of 1 operation rollforming double thread bolt, but put down in writing: conventional roller and closely-pitched roller are separated certain intervals is relative to be disposed as this Patent Document 1, the axial region of bolt packed into carry out rollforming between this conventional roller and the closely-pitched roller, in fact can not make the double thread bolt.This be because, utilize a side roller (common closely-pitched) rollforming ridge can be destroyed by the opposing party's roller (common closely-pitched).
Also have, put down in writing in the Patent Document 1: though the regular screw threads tooth that uses integrally formed and the roller of fine thread tooth can implement equally, but how record particularly could integrally formed regular screw threads tooth and fine thread tooth in the Patent Document 1.The record of integrally formed regular screw threads tooth and fine thread tooth roller see for the first time can think correct, but be actually can not be on 1 roller integrally formed regular screw threads tooth and fine thread tooth, only can not make the double thread bolt according to the record of this Patent Document 1.
So, in fact the double thread bolt of Patent Document 1 record can only be made by cutting.But because aforesaid manufacture method by cutting increases operation than general bolt manufacturing process, so manufacturing cost is high, and it is very high to make the unit price of double thread bolt also improve ground.
Therefore, in the present invention, be purpose with manufacture method and manufacturing installation that a kind of bolt that can produce the such multi-thread bolt of so-called double thread bolt with low unit price in enormous quantities is provided and the thread-rolling die that is used in this manufacturing installation.
For addressing the above problem, thread-rolling die of the present invention possesses: the regular screw threads tooth part of having launched regular screw threads; Launch the fine thread tooth of fine thread and the phase deviation of above-mentioned regular screw threads tooth with correspondence, be the above-mentioned fine thread tooth part of cycle formation in the paddy portion of above-mentioned regular screw threads tooth.Bolt material is being pressed in the manufacturing installation of thread-rolling die rollforming bolt, bolt manufacturing installation of the present invention is with at least one device as the thread-rolling die of the invention described above in the above-mentioned thread-rolling die.Bolt material is being pressed in the manufacture method of thread-rolling die rollforming bolt, bolt manufacturing method of the present invention is with at least one method as the thread-rolling die of the invention described above in the above-mentioned thread-rolling die.
Adopt the manufacture method and the manufacturing installation of bolt of the present invention, partly push bolt material by regular screw threads tooth part and the fine thread tooth that is formed on the thread-rolling die, in 1 operation by the regular screw threads tooth on thread-rolling die part part, and by the part of the part of the fine thread tooth on the thread-rolling die at 1 fine thread tooth of outer surface rolling of bolt material at No. 1 the regular screw threads tooth of outer surface rolling of bolt material.Thus, form regular screw threads tooth part and fine thread tooth part, obtained possessing the bolt of so-called double thread.
Here, regular screw threads are meant the screw thread that the most generally uses that being combined as of diameter and pitch is general.In addition, fine thread is meant that to compare regular screw threads pitch little to the ratio of diameter, the screw thread of depth as shallow.The pitch of fine thread tooth that relates to thread-rolling die of the present invention is so long as the pitch of regular screw threads tooth is following gets final product.In addition, the shape of ridge separately can be any of angular thread, trapezoidal thread, dihedral screw thread, saw-tooth thread, round thread, ratchet screw thread or other special thread or the like, also can be any combination.
In addition, in this manual, with the hand of spiral unanimity of screw thread, and the cylinder or the cone that have two above ridges of different pitch on same axle are called multi start thread.In the multi start thread, when different thread tooth number is 2, be called double thread, the ridge number is 3 o'clock, is called triple thread, the ridge number is at 4 o'clock, be called quadruple thread ..., when the ridge number is n, be called n line screw thread.When likening to a the ridge of the ridge of maximum pitch wherein and minimum pitch than n (a and n are smallest positive integral than), multi start thread ridge shape of its multi start thread on the pitch a of the ridge of each coarse pitch is periodically and changes.
When making the double thread bolt, thread-rolling die has: the regular screw threads tooth part of having launched regular screw threads; With launch in the paddy portion of this regular screw threads tooth with regular screw threads have unidirectional helix and than the little fine thread of the pitch of regular screw threads (still, regular screw threads are that a compares b with the pitch ratio of fine thread, a and b are the smallest positive integral ratio) time, the phase deviation of correspondence and regular screw threads tooth is the fine thread tooth part that the cycle forms in the b of each regular screw threads tooth spiral.
In addition, thread-rolling die also has: regular screw threads tooth part and the paddy portion that partly forms by the fine thread tooth launch and regular screw threads have unidirectional helix and than the also little fine thread of the pitch of fine thread (still, regular screw threads and fine thread are that a compares c than b with the pitch ratio of fine thread, a and b and c are the smallest positive integral ratio) time, correspondence and regular screw threads tooth part and fine thread tooth phase deviation partly, the fine thread tooth part that is in the c of each regular screw threads tooth spiral that the cycle forms is made thus and has been formed regular screw threads tooth part and fine thread tooth part and fine thread tooth triple thread bolt partly becomes possibility.
Also have when making n line screw bolt, thread-rolling die has: the regular screw threads tooth part of having launched regular screw threads; With paddy portion at these regular screw threads launch respectively with regular screw threads have unidirectional helix and than one or more fine threads that pitch is little and pitch is different of regular screw threads (still, regular screw threads are a ratio with the pitch ratio of one or more fine threads ... n, a, n is the smallest positive integral ratio) time, the phase deviation of correspondence and regular screw threads tooth is cycle formation fine thread tooth part separately in the n of regular screw threads spiral.Thus, the multi start thread bolt that makes manufacturing form regular screw threads tooth part and each a plurality of fine thread teeth parts becomes possibility.
Here, when fine thread is launched than the lowest point of regular screw threads tooth in the lowest point when having launched fine thread with being positioned at the high position, the phase deviation of correspondence and regular screw threads tooth, as long as be the fine thread tooth part of pitch minimum in the cycle formation fine thread tooth in the n of each regular screw threads tooth spiral after, then the place, the lowest point that rolling pitch circular diameter moves to when having launched fine thread when rollforming exceeds the inboard of the bolt material of half approximately, the lowest point.Thus, can reduce the change of rolling pitch circular diameter and the change that alleviates the bolt material center position in the processing later stage.
In addition, at this moment, the lowest point during fine thread that expectation has launched is positioned at 5～50% the position that the lowest point than regular screw threads exceeds standard specification fine thread height.As long as in this scope, just can effectively reduce dither and noise in the processing.In addition, than 5% little occasion, almost can't see improvement owing to dither that the lowest point height change is brought and noise.On the one hand, if it is little to surpass the middle footpath of aspect ratio standard specification fine thread tooth of fine thread tooth of 50% multi start thread bolt of being made by rollforming, therefore the engaging to the fine thread tooth of this multi start thread bolt diminishes.
In addition, thread-rolling die possesses the deep trouth of the lowest point that is cut into fine thread tooth part more, therefore during rollforming multi start thread bolt, this deep trouth plays cushioning effect, even bolt material also can produce the multi start thread bolt with standard specification fine thread size to the slot part of thread-rolling die complete filling not.In addition, utilize not exclusively and fill, the dither in the processing later stage of taking place in the time of can suppressing because of complete filling.
At this moment, the degree of depth of expectation groove is 3～10% of a standard specification fine thread tooth height.As long as in this scope, just can give full play to cushioning effect, when can make the multi start thread bolt of fine thread tooth, can fully suppress to process the dither in later stage with complete shape.And, than 3% little occasion, almost can't see the improvement that troughed belt is set.On the one hand, if surpass 10%, then groove is dark excessively, might influence the shape of the fine thread tooth of multi start thread bolt.
Here, thread-rolling die of the present invention, as long as on circular forming rolls, form regular screw threads tooth part and fine thread tooth part, make this thread-rolling die arranged spaced in accordance with regulations, and it is rotated along same direction, by between this thread-rolling die, pushing bolt material, just can make the double thread bolt.
Also have, thread rolling drip molding of the present invention, as long as on dull and stereotyped screw plate, form regular screw threads tooth part and fine thread tooth part, make this thread rolling shaping screw plate predetermined distance configuration, fixing a side makes the opposing party parallel mobile, or make each other along parallel moving in the other direction, by between this thread rolling shaping screw plate, pushing bolt material, just can make the double thread bolt.
In addition, thread-rolling die of the present invention as long as dispose in a plurality of thread-rolling dies of arranged spaced in accordance with regulations one, also can be used as all thread-rolling dies thread-rolling die of the present invention.With an occasion that is used as thread-rolling die of the present invention in the thread-rolling die, other thread-rolling dies are used as the conventional regular screw threads rollforming roller that only launches regular screw threads.In addition, in the manufacture method of the bolt that uses the rotation planetary mode or the occasion of manufacturing installation, also applicable thread-rolling die of the present invention is either party of circular forming rolls or fan-shaped forming rolls, can also be suitable for both sides.
Adopt the present invention, can access following effect.
(1) dispose a thread-rolling die at least, it possesses: the regular screw threads tooth part of having launched regular screw threads; The fine thread tooth of fine thread and the phase deviation of regular screw threads tooth have been launched with correspondence, paddy portion at the regular screw threads tooth is the fine thread tooth part that the cycle forms, utilization is pressed to bolt material the structure of carrying out rollforming in the thread-rolling die, partly push bolt material by regular screw threads tooth part and the fine thread tooth that is formed at thread-rolling die, the part of 1 rollforming regular screw threads and the part of fine thread on the outer surface at this bolt material in 1 operation, therefore can form regular screw threads tooth part and fine thread tooth part, Here it is, and so-called using than the also low expense of cutting cost just can be produced the bolt with double thread in a large number.
(2) dispose a thread-rolling die at least, have: the regular screw threads tooth part of having launched regular screw threads; With launch in the paddy portion of this regular screw threads tooth with regular screw threads have unidirectional helix and than the little fine thread of the pitch of regular screw threads (still, regular screw threads are that a compares b with the ratio of the pitch of fine thread, a and b are the smallest positive integral ratio) time, the phase deviation of correspondence and regular screw threads tooth, in the b of each regular screw threads tooth spiral, be the fine thread tooth part that the cycle forms, utilization is pressed to bolt material the structure of carrying out rollforming in the thread-rolling die, partly push bolt material by regular screw threads tooth part and the fine thread tooth that is formed at thread-rolling die, the part of the part of 1 rollforming regular screw threads tooth and fine thread tooth on the outer surface at this bolt material in 1 operation, therefore can form regular screw threads tooth part and fine thread tooth part, Here it is, and so-called using than the also low expense of cutting cost just can be produced the bolt with double thread in a large number.
(3) also have, at least dispose a thread-rolling die, have: the paddy portion expansion that partly forms by regular screw threads tooth part and fine thread tooth and regular screw threads have unidirectional helix and than the also little fine thread of the pitch of fine thread (still, regular screw threads and fine thread are that a compares c than b with the pitch ratio of fine thread, a and b and c are the smallest positive integral ratio) time, correspondence and regular screw threads tooth part and fine thread tooth phase deviation partly, the fine thread tooth part that is in the c of each regular screw threads spiral that the cycle forms, utilization is pressed to the structure that thread-rolling die carries out rollforming with bolt material, regular screw threads tooth part by being formed at thread-rolling die and fine thread tooth partly and fine thread tooth partly push bolt material, 1 rollforming regular screw threads tooth part and fine thread tooth are partly and fine thread tooth part on the outer surface at this bolt material in 1 operation, therefore can form regular screw threads tooth part and fine thread tooth part and fine thread tooth part, Here it is, and so-called using than cutting the also low expense of cost just can be produced the bolt with triple thread in a large number.
(4) dispose a thread-rolling die at least, also have: the regular screw threads tooth part of having launched regular screw threads; With paddy portion at these regular screw threads launch respectively with regular screw threads have unidirectional helix and than one or more fine threads that pitch is little and pitch is different of regular screw threads (still, regular screw threads are a ratio with the pitch ratio of one or more fine threads ... n, a, n is the smallest positive integral ratio) time, the phase deviation of correspondence and regular screw threads tooth, in the n of regular screw threads spiral, be cycle formation fine thread tooth part separately, utilization is pressed to bolt material the structure of carrying out rollforming in the thread-rolling die, partly push bolt material by regular screw threads tooth part and a plurality of fine thread teeth that is formed at thread-rolling die, the part of the part of 1 rollforming regular screw threads tooth and a plurality of fine thread teeth on the outer surface at this bolt material in 1 operation, therefore can form regular screw threads tooth part and fine thread tooth part separately, Here it is, and so-called using than the also low expense of cutting cost just can be produced the bolt with multi start thread in a large number.
When fine thread is launched than the lowest point of regular screw threads tooth in the lowest point when (5) having launched fine thread with being positioned at the high position, the phase deviation of correspondence and regular screw threads tooth, in the n of each regular screw threads tooth spiral, be the fine thread tooth part that the cycle forms pitch minimum in the fine thread tooth, so that the processing later stage when rollforming reduces the change of rolling pitch circular diameter, the change that alleviates the center position of bolt material.Thus, near impartial, can significantly suppress dither to the material filling rate of the slot part of thread-rolling die.
(6) thread-rolling die possesses the deep trouth that is cut into fine thread tooth part the lowest point more, therefore during rollforming multi start thread bolt, even bolt material to the slot part of thread-rolling die complete filling not, also can be made and have the screw thread wheel and roll the multi start thread bolt of the fine thread size of forming rolls.In addition, utilize not exclusively and fill, the dither in the processing later stage of taking place in the time of can suppressing because of complete filling.
(7) use the regular screw threads tooth that thread-rolling die of the present invention carries out the double thread bolt that rollforming obtains and the front end of the boundary portion of fine thread tooth to be shaped as slick and sly curvature, the double thread bolt made by the cutting seamed edge in the boundary portion generation of regular screw threads tooth and fine thread tooth does not take place.
Description of drawings
Fig. 1 is the synoptic diagram of manufacturing installation of the double thread bolt of expression the 1st embodiment of the present invention.Fig. 2 is the stereogram of the thread-rolling die of presentation graphs 1.Fig. 3 is the rollforming plane outspread drawing partly of the thread-rolling die periphery of Fig. 2.Fig. 4 A is the A-A profile of Fig. 3.Fig. 4 B is the B-B profile of Fig. 3.Fig. 4 C is the C-C profile of Fig. 3.Fig. 4 D is the D-D profile of Fig. 3.Fig. 4 E is the E-E profile of Fig. 3.Fig. 4 F is the F-F profile of Fig. 3.Fig. 5 A is the part enlarged drawing of Fig. 4 A.Fig. 5 B is the part enlarged drawing of Fig. 4 D.Fig. 6 A is the part enlarged drawing that correspondence has increased Fig. 5 A of the thread-rolling die of revising.Fig. 6 B is the part enlarged drawing that correspondence has increased Fig. 5 B of the thread-rolling die of revising.Fig. 7 A is the part enlarged drawing that correspondence has increased Fig. 5 A of the thread-rolling die of revising.Fig. 7 B is the part enlarged drawing that correspondence has increased Fig. 5 B of the thread-rolling die of revising.Fig. 8 A is the part enlarged drawing that correspondence has increased Fig. 5 A of the thread-rolling die of revising.Fig. 8 B is the part enlarged drawing that correspondence has increased Fig. 5 B of the thread-rolling die of revising.Fig. 9 is the synoptic diagram of manufacturing installation of the double thread bolt of expression the 2nd embodiment of the present invention.Figure 10 A, Figure 10 B, Figure 10 C, Figure 10 D, Figure 10 E, Figure 10 F are the profiles of the thread-rolling die used of three screw bolts of the 3rd embodiment of the present invention.Figure 11 A, Figure 11 B, Figure 11 C, Figure 11 D, Figure 11 E, Figure 11 F, Figure 11 G, Figure 11 H are illustrated in the flow figure of trend of material in the A-A section of Fig. 3.Figure 12 A, Figure 12 B, Figure 12 C, Figure 12 D, Figure 12 E, Figure 12 F, Figure 12 G, Figure 12 H are the flow figure of trend of the material that is illustrated in the B-B section of Fig. 3.Figure 13 A, Figure 13 B, Figure 13 C, Figure 13 D, Figure 13 E, Figure 13 F, Figure 13 G, Figure 13 H are the flow figure of trend of the material that is illustrated in the D-D section of Fig. 3.
The specific embodiment
Fig. 1 is the synoptic diagram of manufacturing installation of the double thread bolt of expression the 1st embodiment of the present invention, and Fig. 2 is the stereogram of the thread-rolling die 1 of presentation graphs 1.
As shown in Figure 1, the manufacturing installation of the double thread bolt of present embodiment possess predetermined distance relatively configuration a pair of thread-rolling die 1 and in the bolt support portion 2 of the bolt material 3 of assigned position support cylinder shape (below, be called " workpiece ").In addition, as shown in Figure 2, thread-rolling die 1 forms the rollforming track 4 that the double thread bolt forms usefulness on the periphery of the roller (circular roller) of its cylinder type.
Fig. 3 is the part plane outspread drawing of rollforming track 4 of thread-rolling die 1 periphery of Fig. 2.Fig. 4 A, Fig. 4 B, Fig. 4 C, Fig. 4 D, Fig. 4 E, Fig. 4 F are respectively A-A profile, B-B profile, C-C profile, D-D profile, E-E profile, the F-F profiles of Fig. 3.
As shown in Figure 3, on the periphery of thread-rolling die 1, with each circumference 16 branch such as grade be concatenated to form the corresponding rollforming track 4 of making the double thread bolt.The external diameter of thread-rolling die 1 is 173.987mm, and for regular screw threads pitch is 1.75mm, fine thread pitch is 0.875mm to the double thread bolt in model diameter M12.Therefore, 1 of the double thread bolt five equilibrium rollforming track 4 is formed in 22.5 ° the scope in 360 ° of outer weeks Monday of thread-rolling die 1.The A-A line of Fig. 3, B-B line, C-C line, D-D line, E-E line, F-F line are provided with at interval with 3.75 ° respectively.
Shown in Fig. 4 A～Fig. 4 F, the rollforming track 4 of thread-rolling die 1 (representing with solid line among Fig. 4 A～Fig. 4 F) has: regular screw threads are deployed on the surface of circular roller regular screw threads tooth part as the standard thread tooth (below, be called " regular screw threads tooth portion ") 5; And be formed at additional protrusions 6 among the 5a. of paddy portion of this regular screw threads tooth the same period.Projection 6 has the unidirectional helix of original regular screw threads with the regular screw threads tooth that has launched, and correspondence has launched to compare the little expansion of regular screw threads pitch the fine thread tooth of fine thread (with dashed lines (imaginary line) 6a represents among Fig. 4 A～Fig. 4 F) forms the cycle with the phase deviation 7 of regular screw threads tooth shape.
Here, if with the pitch of regular screw threads and fine thread liken to for a than b (still, a and b are the smallest positive integral ratio, be 2 to 1 in illustrated example), 6 of projections are corresponding when having launched fine thread, with the phase deviation of regular screw threads tooth, in the b of each regular screw threads spiral (1 spiral in illustrated example), form the fine thread tooth part that is the cycle shape.Shown in Fig. 4 A～Fig. 4 F, the fine thread root of the tooth of representing with imaginary line 6a only will form as additional projection 6 from the outstanding part of this regular screw threads tooth according to the phase deviation 7 with the regular screw threads tooth.That is, projection 6 is not a fine thread tooth itself, and just the corresponding phase relative regular screw threads tooth that departs from the imaginary line 6a of 7 the corresponding fine thread tooth of bias is highlighted additional projection.Regular screw threads portion tooth 5 is to remove the part that is formed on thread-rolling die 1 lip-deep fine thread tooth part (surface of projection 6).
In addition, in Fig. 4 A～Fig. 4 F institute example, make position consistency, but be not limited to this as the lowest point 5b with the lowest point 6b of the imaginary line 6a of the fine thread tooth of corresponding projection 6 of the 5a of paddy portion of the regular screw threads tooth of benchmark.
For example, if when the regular screw threads tooth of the double thread bolt (not shown) that the thread-rolling die 1 of usefulness present embodiment is made and regular screw threads nut luer engages with, then only reduce the contact area of projection 6 parts of thread-rolling die 1, by the position of the lowest point 6b of the imaginary line 6a of the fine thread tooth of corresponding projection 6 is moved to the below of Fig. 4 A～Fig. 4 F, can increase the contact area of the regular screw threads tooth and the common helical nut of double thread bolt.
In addition, if conventional thread-rolling die 1, its surface forms either party in regular screw threads tooth or the fine thread tooth, therefore can chimeric regular screw threads nut or fine thread nut.But, the occasion of the thread-rolling die 1 of present embodiment, can be chimeric also can not chimeric regular screw threads nut and fine thread nut.On the surface of thread-rolling die 1 is not integrally formed existing regular screw threads tooth and the fine thread tooth of being put down in writing as Patent Document 1 (concrete structure is indeterminate), but forms regular screw threads tooth portion 5 and form the projection 6 that is the cycle shape in the 5a of paddy portion of original regular screw threads tooth of this regular screw threads tooth portion 5.
When the manufacturing installation of stating two screw bolts of structure is in the use made two screw bolt, be that columned workpiece 3 is configured on the bolt support portion 2, this workpiece 3 is pressed between a pair of thread-rolling die 1, rotate a pair of thread-rolling die 1 along equidirectional (for example, among Fig. 1 as shown by arrows right rotation) respectively.Thus, in an operation, 1 rollforming regular screw threads tooth part and fine thread tooth part on the outer surface of workpiece 3 can access and form regular screw threads tooth part and fine thread tooth double thread bolt partly.
The groove of the opposite rail of the rollforming track 4 of the thread-rolling die 1 of formation Fig. 4 A～Fig. 4 F (the quite groove of regular screw threads tooth portion 5 and projection 6) on the outer surface of the double thread bolt that so obtains.
The double thread bolt that obtains is identical with the double thread bolt that forms by existing cutting, and the fine thread tooth is in and can takes state on formation regular screw threads tooth.Therefore, the double thread bolt that obtains can chimeric regular screw threads nut and fine thread nut.
In addition, usually, make the paddy portion of regular screw threads tooth of chimeric this double thread bolt of peak portion of the regular screw threads tooth of regular screw threads nut, make the paddy portion of fine thread of the peak portion of the chimeric regular screw threads tooth that is formed at this double thread bolt of the peak portion of fine thread of fine thread nut, so the radial direction position of the summit of the radial direction position of the summit of regular screw threads tooth and fine thread tooth as one man forms two screws bolts often.The position consistency ground, the lowest point of position, the lowest point when having launched fine thread and regular screw threads tooth launches fine thread, the phase deviation of corresponding and regular screw threads tooth is the projection of thread-rolling die that is configured for making double thread bolt like this that the cycle forms fine thread tooth part in the b of each regular screw threads spiral.Below, the thread-rolling die that will have raised structures like this is called " standard rollers ".
Fig. 5 A, Fig. 5 B are respectively the part enlarged drawings of Fig. 4 A, Fig. 4 D.Shown in Fig. 5 A, Fig. 5 B, the degree of depth that is periodically variable groove of standard rollers, the position of the lowest point of regular screw threads tooth 5b with for the expansion that forms projection 6 the folded many places (A-A section) of the mutual line in position of the lowest point 6b of fine thread tooth 6a of fine thread the darkest, depart from place's (D-D section) most in the position of the two the most shallow.Therefore, with standard rollers rollforming double thread bolt the time, the instrument in the processing final stage and rolling pitch (the rolling contact position of instrument and the workpiece 3) diameter of a circle of workpiece 3 are seen in A-A section maximum from workpiece 3, in D-D section place minimum.
Its result, in this process segment (promptly processing last running in stage), the center position of workpiece 3 changes often, becomes the reason that produces fierce dither and noise.Because of this dither in various degree, may cause that significantly reduce, make manufacturing installation to be adversely affected bad, the life tools of precision.In addition, in this standard rollers, the area of section difference of the slot part in each section (promptly, in A-A section place maximum, in D-D section place minimum), therefore, create a difference, especially in the processing later stage at material filling rate to the slot part of each section, to the material filling rate height of slot part, the material of multiresidue is shunted nowhere.This also is the reason that produces problems such as high-frequency vibration.
Therefore, in an embodiment of the present invention, expectation projection 6, be in when launching fine thread as the lowest point 6b when the fine thread that launches than the high position of the lowest point 5b of regular screw threads tooth, the phase deviation of correspondence and regular screw threads tooth is the part that forms fine thread tooth 6a periodically in the b of each regular screw threads spiral.At this moment, shown in Fig. 6 A, Fig. 6 B, the fine thread of expansion is the fine thread of the paddy depth as shallow 5～50% of comparison with standard specification, makes the lowest point 6b when having launched this fine thread be in the position that exceeds this amount of shoaling dh than the lowest point 5b of regular screw threads tooth.
Perhaps, shown in Fig. 7 A, Fig. 7 B, the fine thread that launches is smooth change as follows: the position of the lowest point of regular screw threads tooth 5b with for the expansion that forms projection 6 the folded many places (A-A section) of the mutual line in position of the lowest point 6b of fine thread tooth 6a of fine thread be the fine thread of the paddy depth as shallow 5～50% of comparison with standard specification, it is the paddy degree of depth of standard specification that the position of the two is departed from place's (D-D section) most.
The situation that use to increase the thread-rolling die rollforming double thread bolt of these corrections uses standard rollers rollforming occasion to compare with comparing, rolling pitch diameter of a circle in the A-A section moves to half the inboard of workpiece 3 of pact of the amount of the shoaling dh that the degree of depth of the lowest point 6b that makes when having launched fine thread shoals, thereby near the rolling pitch circular diameter of the D-D section of this amount only.Therefore, the change of the rolling pitch circular diameter in processing later stage reduces, and the change of the center position of workpiece 3 reduces.In addition, the area of section of A-A section slot part is near the area of section of D-D section slot part, and therefore, the material filling rate of each section slot part can significantly suppress dither near impartial.
On the one hand, in using the double thread bolt that increases the thread-rolling die rollforming of so revising, the tooth height of fine thread (especially, at suitable A-A section place) is lower than standard specification in the nature of things.But the double thread bolt is obtained most fastening force in its regular screw threads portion, therefore by losing static strength and resistance to vibration so hardly, can bring into play in addition and prevent relaxing effect fully.
But, as use the occasion that increases the thread-rolling die rollforming double thread bolt of revising above-mentionedly, can solve the problems such as dither that when using the standard rollers rollforming, exist, but the tooth height ratio standard specification of the fine thread portion of the double thread bolt of making is low.But, from the intensity of fine thread portion, close degree with fine thread nut stubborn or commodity is considered, can access the high integrality of fine thread portion tooth.
At this moment, shown in Fig. 8 A, 8B, thread-rolling die possesses the groove 6c of the lowest point 6b of the part that is cut into the fine thread tooth 6a that forms as projection 6 more.The depth d v of this groove 6c be fine thread tooth 6a high 3～10%.When utilizing the thread-rolling die rollforming double thread bolt of structure like this, groove 6c plays cushioning effect, even workpiece 3 is not filled to thread-rolling die fully, also can make the double thread bolt with calibrated altitude fine thread tooth.Thus, the dither that takes place in the time of can suppressing to become complete filling in the processing later stage.
Embodiment 2
Fig. 9 is the synoptic diagram of manufacturing installation of the double thread bolt of expression the 2nd embodiment of the present invention.
As shown in Figure 9, possess at the predetermined distance a pair of thread rolling shaping screw plate 8 of configuration relatively at the manufacturing installation of the double thread bolt of present embodiment.One of fixing a pair of thread rolling shaping screw plate 8 can dispose with parallel mobile the opposing party ground, or can parallel in opposite direction mutually configuration movably.
Thread rolling shaping screw plate 8 forms the rollforming track 9 that the double thread bolt forms usefulness in the one side of flat steel plate (screw plate).Rollforming track 9 is identical with the rollforming track 4 of the 1st embodiment that is launched into the plane.
Use when so the manufacturing installation of double thread bolt is made the double thread bolt, columned workpiece 3 is pressed between a pair of thread rolling shaping screw plate 8, make a side thread rolling shaping screw plate 8 keep parallel abreast moving, or move along opposite direction is parallel mutually with the opposing party's thread rolling shaping screw plate 8.Thus, with the 1st embodiment similarly, in an operation, 1 rollforming regular screw threads part and fine thread part on the outer surface of workpiece 3 can access and form regular screw threads part and fine thread double thread bolt partly.
Figure 10 A, Figure 10 B, Figure 10 C, Figure 10 D, Figure 10 E, Figure 10 F are the profiles of the thread-rolling die 10 used of the triple thread bolt of the 3rd embodiment of the present invention.The periphery of thread-rolling die 10, with each circumference 16 branch such as grade be concatenated to form the corresponding rollforming track of making the triple thread bolt.Figure 10 A～Figure 10 F is the figure with 3.75 ° time interval thread-rolling die 10 periphery sections.
The thread-rolling die of using at the triple thread bolt shown in Figure 10 A～Figure 10 F 10 also has projection 12, this projection 12 has the original regular screw threads unidirectional helix with the regular screw threads tooth that has launched, be by launching to liken to pitch into original fine thread of forming projection 6 also will be little fine thread in the paddy portion that forms by regular screw threads tooth portion 5 and projection 6 11 (still, the pitch ratio of regular screw threads and fine thread and fine thread be a than b than c, a and b and c are the smallest positive integral ratio.Be 4 to 2 to 1 in the illustrated example) time, the phase deviation of corresponding and regular screw threads tooth portion 5 and projection 6, the part that (1 spiral in illustrated example) forms the fine thread tooth (with dashed lines (imaginary line) 12a represents among Figure 10 A～Figure 10 F) that is the cycle shape in the c of each regular screw threads tooth spiral constitutes.
Shown in Figure 10 A～Figure 10 F, fine thread tooth 6a only will form as additional projection 6 from the outstanding part of this regular screw threads tooth.Also have, in this thread-rolling die 10, fine thread tooth 12a only will form as additional projections 12 from these projection 6 outstanding parts.Projection 12 is not fine thread tooth itself, but the dotted line 12a of the fine thread tooth of corresponding bias place of phase deviation of corresponding and regular screw threads tooth portion 5 and projection 6, the additional protrusions that relative regular screw threads tooth portion 5 and projection 6 are highlighted again.
In addition, not shown, during rollforming n line screw bolt, also can use thread-rolling die with following structure, have: the regular screw threads tooth part of having launched regular screw threads; Launch respectively to have that little and pitch is different one or more fine thread is (still with the unidirectional helix of regular screw threads and than regular screw threads pitch with paddy portion at this ridge, making the regular screw threads and the pitch ratio of one or more fine thread is a ratio ... compare n, a, n is the smallest positive integral ratio) time, the phase deviation of corresponding and regular screw threads tooth forms the projection that the part by separately fine thread tooth that is the cycle shape constitutes in the n of each regular screw threads tooth spiral.
In addition, even in the thread-rolling die of this n line screw bolt of rollforming, also can increase the correction identical with the thread-rolling die of the 1st embodiment.Increase is during to the correction of the paddy degree of depth, when fine thread is launched in the lowest point when making the fine thread that launches minimum pitch with being positioned at the position higher than the lowest point of regular screw threads tooth, the phase deviation of correspondence and regular screw threads forms the fine thread tooth that is the cycle shape and partly gets final product in the n of each regular screw threads tooth spiral.
The manufacturing installation of double thread bolt of analyzing relevant the 1st embodiment that uses the invention described above is with the mechanism of double thread rollforming to the bolt.The flow figure of trend of the material that Figure 11 A～Figure 11 H, Figure 12 A～Figure 12 H, Figure 13 A～Figure 13 H is illustrated respectively in A-A section, B-B section, the D-D section of Fig. 3.In addition, in Figure 11 A～Figure 11 H, Figure 12 A～Figure 12 H, Figure 13 A～Figure 13 H, when a pair of thread-rolling die 1 is rotated along same direction, A～H be with shorten continuously each other apart from the time information slip be shown with the amount of feeding of about 0.1～0.2mm the most at last thread-rolling die be pushed into the state of about 1mm in the workpiece 3.
Shown in Figure 11 A～Figure 11 H, Figure 12 A～Figure 12 H, Figure 13 A～Figure 13 H, along with thread-rolling die 1 is pressed to workpiece 3 gradually, imbed the 5a of paddy portion of regular screw threads tooth when at first, workpiece 3 produces plastic deformation along the surface of the regular screw threads portion 5 of thread-rolling die 1.And, in imbedding process, this time when the surface that adds outstanding projection 6 produces plastic deformation, imbedded the 5a of paddy portion.Thus, obtained forming the double thread bolt of regular screw threads part and fine thread part.
Embodiment 2
Carry out the invention described above the 1st embodiment increase the compare test of thread-rolling die of revising and the double thread bolt of making according to standard rollers.Table 1 is at two kinds of model M12 and M16, the lowest point 6b degree of depth of measuring the fine thread tooth respectively the change dither of the degree of depth with groove 6c work in-process when changing and the result of noise.In addition, the pitch ratio of thread-rolling die that is used to make the double thread bolt of M12 is 1.75 to 0.875, and M16 is 2 to 1.
Table 1
| The thread-rolling die kind | The lowest point degree of depth | Groove depth | Dither | Noise |
| Standard rollers | 0％ | 0％ | Greatly | Greatly |
| Revise |
5％ | 0％ | In | In |
| Revise roller 2 | 10％ | 0％ | Little | Low |
| Revise |
20％ | 0％ | Do not have | Low |
| Revise |
40％ | 0％ | Do not have | Low |
| Revise |
0％ | 5％ | In | In |
| Revise |
0％ | 10％ | In | In |
Can confirm from table 1: change the thread-rolling die of having revised in the degree of depth of the lowest point 6b that makes the fine thread tooth, the fine thread tooth of degree of depth relative standard's specification of the lowest point 6b was shoaled shallow more dither and the noise that adds man-hour that can reduce more of the degree of depth at 5%～40% o'clock.On the one hand, in the degree of depth correction that changes groove 6c thread-rolling die in, the degree of depth that makes groove 6c be the fine thread tooth of standard specification high 5% and 10% o'clock, the dither and the noise that add man-hour are improved.
In addition, these thread-rolling dies have passed through all and have utilized the lax test of US Airways specification NAS3354 vibration-testing method.In addition, in the static strength test that utilizes the pull-type extension test method of A Musi and utilize in the dynamic test of hydraulic servo formula method of testing, can confirm to possess the ability that is equal to the standard thread bolt.
The present invention is practical when being used for that the rollforming manufacturing has the multi start thread bolt that prevents lax function.
Claims (16)
1. one kind is pressed to the manufacture method of rollforming bolt on the thread-rolling die with bolt material, it is characterized in that at least one in the above-mentioned thread-rolling die has: the part of having launched the regular screw threads tooth of regular screw threads; And have unidirectional helix at the paddy portion of above-mentioned regular screw threads tooth and above-mentioned regular screw threads and when the mode that will be than the pitch of above-mentioned regular screw threads little fine thread is positioned at high position with its lowest point than the lowest point of above-mentioned regular screw threads is launched, the phase deviation of corresponding and above-mentioned regular screw threads tooth, with in the b of each above-mentioned regular screw threads tooth spiral, be periodically the corresponding projection of fine thread tooth that forms, wherein, the pitch ratio of above-mentioned regular screw threads and above-mentioned fine thread be a than b, a and b are the smallest positive integral ratio.
2. one kind is pressed to the manufacture method of rollforming bolt on the thread-rolling die with bolt material, it is characterized in that at least one in the above-mentioned thread-rolling die has: the part of having launched the regular screw threads tooth of regular screw threads; Has unidirectional helix with paddy portion and above-mentioned regular screw threads at above-mentioned regular screw threads tooth, and will be littler and one or more fine threads that pitch is different when launching respectively than above-mentioned regular screw threads pitch, but, for the fine thread of pitch minimum is when launching in the mode that its lowest point is positioned at high position than the lowest point of above-mentioned regular screw threads tooth, the phase deviation of corresponding and above-mentioned regular screw threads tooth, with in the n of each above-mentioned regular screw threads spiral, be periodically the corresponding projection of fine thread tooth that forms separately, wherein, above-mentioned regular screw threads are a ratio with above-mentioned one or more the pitch ratio of fine thread ... compare n, a,, n is the smallest positive integral ratio.
3. the manufacture method of bolt according to claim 1 is characterized in that: the lowest point when having launched above-mentioned fine thread, than the lowest point of above-mentioned regular screw threads tooth exceed the fine thread tooth of standard specification high 5%～50%.
4. the manufacture method of bolt according to claim 2 is characterized in that: the lowest point when having launched above-mentioned fine thread, than the lowest point of above-mentioned regular screw threads tooth exceed the fine thread tooth of standard specification high 5%～50%.
5. one kind is pressed to the manufacturing installation of rollforming bolt on the thread-rolling die with bolt material, it is characterized in that at least one in the above-mentioned thread-rolling die has: the part of having launched the regular screw threads tooth of regular screw threads; And have unidirectional helix at the paddy portion of above-mentioned regular screw threads tooth and above-mentioned regular screw threads and when the mode that will be than the pitch of above-mentioned regular screw threads little fine thread is positioned at high position with its lowest point than the lowest point of above-mentioned regular screw threads is launched, the phase deviation of corresponding and above-mentioned regular screw threads tooth, with in the b of each above-mentioned regular screw threads tooth spiral, be periodically the corresponding projection of fine thread tooth that forms, wherein, the pitch ratio of above-mentioned regular screw threads and above-mentioned fine thread be a than b, a and b are the smallest positive integral ratio.
6. one kind is pressed to the manufacturing installation of rollforming bolt on the thread-rolling die with bolt material, it is characterized in that at least one in the above-mentioned thread-rolling die has: the part of having launched the regular screw threads tooth of regular screw threads; Has unidirectional helix with paddy portion and above-mentioned regular screw threads at above-mentioned regular screw threads tooth, and will be littler and one or more fine threads that pitch is different when launching respectively than above-mentioned regular screw threads pitch, but, for the fine thread of pitch minimum is when launching in the mode that its lowest point is positioned at high position than the lowest point of above-mentioned regular screw threads tooth, the phase deviation of corresponding and above-mentioned regular screw threads tooth, with in the n of each above-mentioned regular screw threads spiral, be periodically the corresponding projection of fine thread tooth that forms separately, wherein, above-mentioned regular screw threads are a ratio with above-mentioned one or more the pitch ratio of fine thread ... compare n, a,, n is the smallest positive integral ratio.
7. bolt manufacturing installation according to claim 5 is characterized in that: the lowest point when having launched above-mentioned fine thread, than the lowest point of above-mentioned regular screw threads tooth exceed the fine thread tooth of standard specification high 5%～50%.
8. bolt manufacturing installation according to claim 6 is characterized in that: the lowest point when having launched above-mentioned fine thread, than the lowest point of above-mentioned regular screw threads tooth exceed the fine thread tooth of standard specification high 5%～50%.
9. a thread-rolling die is characterized in that having: the part of having launched the regular screw threads tooth of regular screw threads; And have unidirectional helix at the paddy portion of above-mentioned regular screw threads tooth and above-mentioned regular screw threads and when the mode that will be than the pitch of above-mentioned regular screw threads little fine thread is positioned at high position with its lowest point than the lowest point of above-mentioned regular screw threads is launched, the phase deviation of corresponding and above-mentioned regular screw threads tooth, with in the b of each above-mentioned regular screw threads tooth spiral, be periodically the corresponding projection of fine thread tooth that forms, wherein, the pitch ratio of above-mentioned regular screw threads and above-mentioned fine thread be a than b, a and b are the smallest positive integral ratio.
10. a thread-rolling die is characterized in that having: the part of having launched the regular screw threads tooth of regular screw threads; Has unidirectional helix with paddy portion and above-mentioned regular screw threads at above-mentioned regular screw threads tooth, and will be littler and a plurality of fine threads that pitch is different when launching respectively than above-mentioned regular screw threads pitch, but, for the fine thread of pitch minimum is when launching in the mode that its lowest point is positioned at high position than the lowest point of above-mentioned regular screw threads tooth, the phase deviation of corresponding and above-mentioned regular screw threads tooth, with in the n of each above-mentioned regular screw threads spiral, be periodically the corresponding projection of fine thread tooth that forms separately, wherein, above-mentioned regular screw threads are a ratio with the pitch ratio of above-mentioned a plurality of fine thread ... compare n, a,, n is the smallest positive integral ratio.
11. thread-rolling die according to claim 9 is characterized in that: the lowest point when having launched above-mentioned fine thread, than the lowest point of above-mentioned regular screw threads tooth exceed the fine thread tooth of standard specification high 5%～50%.
12. thread-rolling die according to claim 10 is characterized in that: the lowest point when having launched above-mentioned fine thread, than the lowest point of above-mentioned regular screw threads tooth exceed the fine thread tooth of standard specification high 5%～50%.
13. a multi start thread bolt is characterized in that with the described thread-rolling die of claim 9, the multi start thread bolt of pushing bolt material rollforming.
14. a multi start thread bolt is characterized in that the multi start thread bolt with the described thread-rolling die pushing of claim 10 bolt material rollforming.
15. a multi start thread bolt is characterized in that the multi start thread bolt with the described thread-rolling die pushing of claim 11 bolt material rollforming.
16. a multi start thread bolt is characterized in that the multi start thread bolt with the described thread-rolling die pushing of claim 12 bolt material rollforming.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003081247 | 2003-03-24 | ||
| JP081247/2003 | 2003-03-24 | ||
| JP352624/2003 | 2003-10-10 |
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| CN1325190C true CN1325190C (en) | 2007-07-11 |
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| CNB2004800079319A Expired - Lifetime CN1325190C (en) | 2003-03-24 | 2004-03-19 | Method and device for manufacturing bolt, screw rolling die used therefor, and multiple screw bolt |
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| JP5401667B2 (en) * | 2007-10-12 | 2014-01-29 | 有希 安藤 | Method for manufacturing rolled screw shaft |
| WO2010011483A2 (en) * | 2008-07-21 | 2010-01-28 | 3M Innovative Properties Company | Apparatus for dispersing additive into a fluid stream |
| CN105537475A (en) * | 2015-11-20 | 2016-05-04 | 江门市宏乔新材料科技有限公司江海区分公司 | Screw thread rolling processing mechanism |
| CN113894372B (en) * | 2021-09-29 | 2022-12-27 | 航天精工股份有限公司 | MOD correction thread rolling wheel and machining method for correcting large-diameter threads |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86106864A (en) * | 1985-11-22 | 1987-08-05 | 日本特殊机材株式会社 | Screw with groove for self-lock, its method for roll forming and rolling flat die thereof |
| CN1117121A (en) * | 1994-08-13 | 1996-02-21 | 株式会社志分 | A selflock bolt, a process for producing the selflock bolt, and a dice used directly in the working of the process invention |
| JP2003232326A (en) * | 2002-02-06 | 2003-08-22 | Eco World:Kk | Loosening preventing bolt and manufacturing method therefor, flat dies and manufacturing method therefor |
| JP2003260532A (en) * | 2002-03-08 | 2003-09-16 | Japan Power Fastening Co Ltd | Apparatus and method for manufacturing bolt |
-
2004
- 2004-03-19 CN CNB2004800079319A patent/CN1325190C/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86106864A (en) * | 1985-11-22 | 1987-08-05 | 日本特殊机材株式会社 | Screw with groove for self-lock, its method for roll forming and rolling flat die thereof |
| CN1117121A (en) * | 1994-08-13 | 1996-02-21 | 株式会社志分 | A selflock bolt, a process for producing the selflock bolt, and a dice used directly in the working of the process invention |
| JP2003232326A (en) * | 2002-02-06 | 2003-08-22 | Eco World:Kk | Loosening preventing bolt and manufacturing method therefor, flat dies and manufacturing method therefor |
| JP2003260532A (en) * | 2002-03-08 | 2003-09-16 | Japan Power Fastening Co Ltd | Apparatus and method for manufacturing bolt |
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