DE1477053A1 - Chipless tool for making threads - Google Patents

Description

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(General American Transportation Corporation, Ghicago / Illinois

Chipless tool for making threads

The subject of the invention are flute-free ./ tools, with which threads are inserted into generally cylindrical surfaces I will be able to.

In particular, the invention provides for a clamping groove-free tool for producing threads with an elongated one
iäohait, which consists of a generally cylindrical rear body part and a generally keäelstumpi _A ormigen, forward
si-itk, the running-in part consists, itit a continuous
aewinae on the ochait, Jas a number of ./indings on uem
ru ^ tcw ar ti gen iv body part and a number of ^ iadun ^ en on the
yoraeren i · ¹ ohrungteil uiiaasst, * elctes thread a fixed osteigunu; having, wherein the turns on the rear body part have essentially the same inner radius,

909831/0360

BATH ORIGINAL

U77053

while the front indentations on the front guiding part have gradually decreasing inner radii, the windings on the rear part of the body having a first tip height from the root and the indentations on the front guiding part a second tip height from the root, of which the inherited tip height is greater than the second tip height, and with a number of thread-indented points, aie from the openings on the front J? Around the length of the vindes ^ e era Jen are in such a way that between the requests D = nachuarcör x ^ read there is a rtotatic angle A around the longitudinal axis of the roof, where A is 5 & Ο ° + B, while B is a fixed ./angle inner na Ib is a range from 60 ° to 120 °, unj. “Each axis having a tüotationswinkel 0 uia the longitudinal axis of the roof around, where J is a given angle within a range of bO ° to 120 °, each axis having an opening with a front and a rear edge and two , each of which is provided with front and rear surfaces, the front and rear edges of each vase vertex continuing in the adjacent parts of the apex of the associated binding on the front guide part, while the front and rear surfaces of each rabbit flank extend into the adjacent ones File the flank of the associated / indung on the anterior jj'ührun ^ place steep χ.

part of an execution form. of the flute-free, / original equipment for the manufacture of windings according to the invention, jeae üase from the root a variable height of the tip, whose the greatest "/ er is essentially on the middle, and the dei dem The maximum value is significantly greater than the second peak height aer

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associated turn on the front guide part, preferably the greatest peak height of the furthest rearward iMasen substantially equal to the first peak height of the turns on the back of the body is

In a further embodiment of the mentioned tool each point has a variable flank width at the root, the largest of which lies essentially at the middle, and which at its maximum value is significantly larger than the flank width of the associated turn on the front guide part, wherein preferably the largest flank width of the furthest backward oases essentially equal to the flank width of the Turns on the back of the body.

In another embodiment, the tool the shape of a self-engaging fastening screw with a widened head provided at the rear end of the shaft, on which a tool can attack, the screw into a pre-formed opening provided on a core piece a thread plunges when the screw is screwed into the front end piece will.

i) The invention will now be described in detail. In the accompanying drawings the
1 shows a side view of a blank which is used for the production

of the removal tool according to the invention can be used, Fig * 2 is a side view of the thread-engaging fastening screw according to the invention, Figure 3 is an enlarged schematic representation of the profile of the front part of the thread on the front guide part the screw according to Figure 2,

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4 shows an enlarged schematic representation of the elevation

of the front part of the thread according to FIG. 3, FIG. 5 shows a greatly enlarged detail from a side view of the front part of the screw according to FIG Figures $ and 4 are developed, and Figure 6 is an enlarged schematic representation of the suitable rfinkelstellung certain compression lugs. Figures 2 - b show a spannutenloses aewindeschneidwerkzeug in the form of a while diving combined G-ew and mounting screw 10 according to the invention, an elongated shaft 11 having a forward tapered substantially Kegelsfcunipff örmigen front Fahrungsteil and having a substantially cylindrical rear Having body part. At the furthest rackw & rts inde of the rear body part 11b of the shaft 11, the screw 1C is provided with a widened head 12 in a suitable design, a hexagonal head 12 being shown for the purposes of the description. The screw 10 can be screwed in in a manner known per se. head 12 a socket wrench (not shown) are attached. The shaft 11 of the screw 1U is further provided with a continuous rolled thread 14 which has a number of front windings 14a, 14b, 14c, 14d, 14e and 14f on the front guide part 11a and a number of. rear turns 14w, 14x, 14y, etc. on the rear body part 11b. Six findings are therefore provided on the front driving part 11a, with the »/ indications 14a-f hereafter being the first,

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second, third, fourth, fifth and sixth ties on the front Guide part 11a are designated.

The winch 14 has a fixed pitch, and the windings 14w, 14x, 14y etc. on the rear body part 11b have essentially the same fixed inner radius, while the front windings 14f, 14e, 14d etc. on the front guide part 11a aux The turns 14w, 14x, 14y, etc. on the rearward part 11b have essentially the same fixed outer radius and consequently a corresponding first fixed tip height from the root, while the front turns 141, 14e, 14d etc. at the front tube part 11a successively have a gradually decreasing outer radius and thus a corresponding second fixed tip height from the root, with this arrangement the first tip height of the rear windings 14w, 14x, 14y etc. is essential greater than the second tip height of the front turns 14f, 14e, 14d, etc., as shown in the figure n 2 and 5 can be clearly seen. In particular, the radial distances between the two are discontinuous, passing through the tips of the back turns 14w, 14x, 14y, and so on. Lines. 15b and the relevant nifurzellinien the rear "/ indungen 14w, etc. is greater than the radial distances between the two broken, USWE by the Opitz aer front windings 14a, 14b, 14c extending lines and the respective ffurzellinien the front windings 14w etc _# of FIG .5 · Each rear connection 14w etc · has a crest and two flanks which each form an angle of about 60 with ^Q and the

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The root has a first flank width, and each preceding , tail 14a, etc., has a vertex and two flanks which form an angle of about 60 ° with one another and have a second flank width at the root, of course the above Flank width of each rtic & waiting turn I4w unsw · much larger than the mentioned flank width of each front. <Iniung 14a etc.

The screw 1U is also luit a range of j-ewina tap noses 16a, 16c, 16d and 16e on, the aa of the front "* indung 14a, 14c, 14d dec. 14e provided una in aen iigures 3 and are shown. There are therefore four wasens provided, ax of and windings on the front end part 11a lan ^ s of the iewinate 14, whereby the neighboring lyases enclose a notation angle A around the longitudinal axis of the shaft 11, where A «360 ° + B while B is a fixed angle of about 120 ° as shown, and in the present example angle A includes a suction of 480 as shown in FIGS. Furthermore, each fan includes a hot angle C around the longitudinal axis of the shaft 11, where 0 is a given »prong! of about 120 is as shown; All relationships are shown in the developments in iigures 3 and 4 as well as in i'ig.6, from which it can be seen that the rabbits 16a, 16c, 16d and 16e are designated clockwise. This contraction is further be apparent from the Figure 5, hereinafter are provided the four complete turns away at the front i'iihrungsteil 11a or 1440 ü-ewindes 14, wherein the aase 16e is aligned directly behind the Mase 16a and to this. Metfase 16c is angularly about 4öG ^& or about an apparent

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BATHROOM OBlOiHAL

U77053

Angle of 120 ° offset in bezu ^ aui aie itfase 16ab, while sets the j 'ase iodine to 4öü ° odex to the apparent rfinkel of 120 ° with respect au ± ax isase 1öc is "iiie JSase 16e is winiceimäßig around 460 ° or by the apparent angle of 120 ° in relation to the nose 1bd.

As can best be seen in FIG. 5, the dies 1oaD, 10oc, 1cd and 16e have essentially the same structure and the same arrangement, with the exception that the lugs 16ab etc. extend backwards along the length of the front ij'guiding part progressively coarser, rfie best shown in eier Fig.4, shows z. ± s. the base 16d on the front turn 14d has a vertex 1bd1 ikit aen front and rearward edges 16a1L and 16d1T as well as two flanks 1od2 and 16d3, which with the front and rdc.-cw-like surfaces 16a2L, 1öd2'i and 16d3L, -lödjJiC are provided, jie anterior and rackwarti ^ tn iv.ancen 1bd1L and 1oa1'i ^v aes i ^ asenscheitels 1cd1 continue in the au bordering ¹ Ic ilen of the associated anterior, ij.naung I4d, while the anterior and posterior υ Laughs 1cd2L and 1bd2S of aasenilanKe 1bd2 continue in the adjoining ± parts of the outer ilaflute of the associated #connection 14-d, and the front and rear surfaces 1bd3L and 16d $ T of the flank 16dJ continue in the adjoining parts of the relevant flank associated front turn 14d. The front apex chew 16d1L gradually rises radially out of the apex of the associated front turn 14d, and the rear apex edge 16diT gradually falls radially back into the apex of the associated front turn 14d. Therefore, the nose 16 has a variable apex height from the root, the largest of which is substantially at the center

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and which at its maximum value is substantially greater than the second vertex height of the associated turn 14d. The front flank surface 16d2L gradually rises both radially and axially forward from the relevant flank of the associated front turn 14d, while the rear flank surface 16d2L gradually both radially and axially backwards back into the relevant flank of the associated front Win_ dung 14d falls, and likewise the front flank surface rises

16dJ1 gradually both radially and axially from the subject Edge of the associated front connection I4d from on, and the rear Flank surface 16d3T gradually falls both radially and axially forward into the relevant flank of the associated front turn 14d back from. The nose 16d then instructs the root has a variable flank width, the largest of which is essentially due to its cement, and that of the largest ffert is significantly larger than the flank width of the associated front turn 14d.

The progressively larger noses I6ab, 16c, 16d and 16e backwards along the front guide part 11a are best shown in Fig. 4, from which it can be seen that passing through the lower part of the vertex of the noses I6ab and 16c running lower broken line 15c is below the adjacent lower broken line 15a. Further lies the upper broken line 15d corresponds to the lower broken line Line 15c above the corresponding upper broken line 15a passing through the upper parts of the front findings 14a, etc., from which it can also be seen that the greatest vertex heights of the noses 16ab, etc., are significantly greater

909831/0360 _8AD ORIGINAL

U77O53

than the apex height of the front turns 14a, etc. The largest The apex height of the rearmost nose 16e is substantially equal to the apex height of the rear turns 14w, 14x, etc., and likewise the largest flank width 16e is essentially equal to the flank width of the rear turns 14w, 14x etc.

The already mentioned ßotation angle A between the iViitten of adjacent lases 16ab, 16c, 16d and 16e is A >> 360 ° + B, whereby B can be in the general range from 60 to 120 °, and with a smaller angle B the number t the bevel on the turns of the front guide member 11a is increased on the assumption that six such turns are provided, as described above. It is also not critical to provide six such turns on the front guide part, and their number can be increased accordingly if the front guide part 11a is dimensioned with a fixed incline dts tlewiades 14, as described above. With a smaller pitch of the thread 14, a larger number of turns can of course be arranged on the front guide part 11a for a given length.

In the aforementioned formula, the angle B can have any desired value in the approximate range of 60 to 120 °. If the angle B shows a value (30 °, 36 °, 40 °, 45 ° or 60 °) by which the 360® can be divided without Best, the holes in the thread 14 run in straight rows along the front shaft part 11a, while the chamfers in the thread 14, if the angle B has a value by which 360 ° cannot be divided without best, lie in oblique rows that run along the front shaft -

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H77053

Shank part 11a run. If the angle B includes 60 °, then result In these different versions of the thread 14, six legs extending in the longitudinal direction of itfasen, in one Angle B of 72 ° is 5, with an angle ß of 80 °, the number of which is 9 »at an angle of 90 ° their number is 4 and at an angle B of 120 ° the number is of the longitudinal rows of noses three. In each case, the rows of noses point around the longitudinal line of the shaft 11 around the same distance from each other. Although a large number of these U-thread training courses are quite common has proven to be satisfactory, it has been shown that designs with an odd number of none of w are generally preferable, as these are easier to screw in and produce a more even torque, aas when screwing in of the front i'dhrung part of the thread 14 in the guide hole provided on a workpiece (not shown) is required.

The one comprised by the ttases 16ab, 16c, 16d and 16e and in the illustrated embodiment, ßotationswinkel amounting to 120 ° 0 is not critical, although this diaper 0 is essential should be and can be in the general range from 6ü to 120 °.

The preferred embodiment of the screw shown 10, where both the angle B »120 ° and the angle 0» 120 ° is, is very advantageous because this embodiment is characterized by an extremely low torque in comparison to the other cited embodiments, which JrehmoiLent is required to turn the screw 10 when pulling it in

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to effect a conventional pre-formed guide hole provided on a workpiece used for examining the various threads on the screws 10 according to the invention, as described above. It is believed that this result is achieved by the interaction between the dimensional and positional arrangements of the elements of the thread 14 in the described preferred embodiment of the thread 14 of the screw 10.

When producing the screw 10, a corresponding hollow B1Ü is provided, which is shown in FIG. The blank 10 is forged or formed from metal and has an elongated shank B11 with a substantially frustoconical front throat part B11a and a substantially cylindrical rear body part B11b. At the rear end of the rear body part B11b, the blank B1O is provided with a hexagonal head B12. Furthermore, two nominal or rebate plates (not shown) are provided, between which the shank B11 of the blank B10 is rolled, the webs and grooves provided on the bole or rebate plates producing a continuous thread 14 in known iffeise on the shank 11 of the screw 10 .

In general, the fiohling B10 is made from a steel with made of low carbon, and after making the screw this is done in a well-known way through heat treatment hardened. In particular, it is highly desirable that the front Coils 14w etc - are quite hard if the screw 10 is frequent is used to produce an internal thread in a cylindrical bore provided on a workpiece, if such

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Workpiece made of steel or some other hard material

From the foregoing description it can be seen that a Flute-free tool without opening grooves for producing threads and in particular, a fastening screw with an improved Construction and an improved arrangement was created. This tool has the great advantage that with this into the generally cylindrical surface of one on a workpiece provided guide bore a thread without the formation of overtones or waste a thread can be cut by upsetting. In addition, the improved tool is much more effortless to use handle than a comparable cutting thread cutting tool, since the improved tool is a much smaller one Drive torque is required as a conventional "cutting tool".

Claims

909831/0360 _BAD

Claims (1)

Jb'atent claims Dr. Ex oil. 1) Chipless tool, for producing threads on a generally cylindrical surface, zr>. in ϋοη a threaded offset and fastening screw, with an elongated shaft, which consists of a generally cylindrical body part and a generally truncated cone! The pitch thread on the shaft comprising a number of turns on the rear body part and a number of turns on the front thread part, the turns on the rear body part having substantially the same inner radius, while the front turns on the front watch part have gradually decreasing inner radii, characterized in that the ./indungen on the rear part of the body from the root have a first vertex height and the windings on the front guide part have a second vertex height from the root, of which the first Vertex height is greater than the second vertex height, that the windings on the front guide part along the G-thread carry a number of thread-dipping lugs in such a way that the adjacent threads encompass an angle of rotation LA around the longitudinal axis of the shaft, where A- 36O is ^Q + B, while B is a fixed thread is within a range of 60 ° to 120 °, with each rabbit encompassing a hotation angle O around the longitudinal axis of the shaft, where 80983 1/0380 BATH ORIGINAL U77053 where G is a given tfin & el within a range from 60 ° to 120 °, that each j> iase has an opening with a front and a rear edge and two α ianks, each of which is provided with front and back-like lips, aass the front and back The reverse edges of each apex are continued in the adjoining parts of the apex of the associated turn aia the front guide part, and the front and rear surfaces of each liasenil.anke are in the adjoining parts of the flank of the associated binding on the front Continue the leading part . 2) Tool according to claim 1, characterized in that each of the above-mentioned lugs has a variable vertex height from the root, the largest of which is essentially at its ikitte , and which at its maximum value is substantially larger than the second .Scheitelhöhe of the associated turn on the mentioned front guiding part. 3) Tool according to claim 1 or 2, characterized in that that the greatest a unit height of the furthest backwards it bevels on the aforesaid front duct part are essentially the same the first vertex height of the turns at the r dc kw ar ti mentioned body part is. . . Tool according to claim 1, 2 or 3, characterized in that that each of the named Üasenan der Jurzel is a changeable one has flank width, aeren the largest ϊ / ert essentially at the middle is, and at the highest value is essential greater 90983 1/0360 U77-053 is than the flank width of the associated winding on the front ijdprteil. 5) rferkzeug according to one of the address 1 to 4, thereby marked, ctass the greatest if flank width the furthest Basically rearward located uase on the front guide part equal to the flank width of the turns au. called rear Body part is. 6) Tool according to one of the address 1 to 4, thereby marked that the front edge of the vertex of all wasen from the adjacent part of the (vertex of the associated turn from gradually increasing radially, and that the rear edge of the crown of all wasen in the adjacent part of the crown the associated curve gradually falls back radially. 7) Tool according to claim 1, 4 or 5, characterized gekennzeichnei that the .front surface of each flank of all cheeses from the adjacent part of the flank of the associated turn from both radially as well as axially gradually increases, and that the rearward Surface of each flank of all lugs, in the adjoining part of the flank of the associated bond gradually both radially as also falls back axially. 8) Tool according to one of claims 1 to 7 »thereby characterized in that B and / or 0 is approximately 120 °. 909831/0360 BADORiGIWAL H77053 9) v / tool according to one of claims 1 Dis ö, characterized It is noted that B and O are approximately equal to each other. 1ü) Jewel thread and fastening screw according to one of the Claims 1 to 9 with one at the rear end of the rear Body part provided widened / head and with a the switch provided rolled continuous iewind, thereby marked that the "/ indungen on the front guide part a Bear the number of thread-engaging lugs. 909831/036 0 BATH Empty egg