SU726373A1 - Method of preventing material jamming - Google Patents

Description

The invention relates to means for fastening and joining structural elements having a thread. There is a method in which a bolt of alloy steel along the entire thread section has a hard coating of FROM chromium, and a nut made of magnetic or OR austenitic steel, which in order to avoid corrosion is doped with titanium, niobium OR copper l. However, the application of solid coatings to the threaded part greatly complicates the manufacturability of the production, the threads would. It should also be noted that with repeated use of a threaded joint (screwing, unscrewing), an intense plastic deformation of the base material of the thread occurs, followed by destruction of the south hard coating in the contact area of the adjacent turns of the threaded joint. This contributes to the emergence and development of either the process of seizure or the corrosion process c. sj e eifcUIn a threaded connection, depending on the st {euktury and properties of materials, and ijErSif iii-a iS t 5 ..: ...., si:., - iiiii-aii .: i-b; i -. --- - .., also FROM the composition of the environment and actuation, in; e- | And u with tvuschuyuschih G on the threaded connection. five . Production of threaded connections IIYt i l- -L; t - gljf-: J --- 4 ™ - .... .-, -,. .. - .- -, .- .-, аШ / ИИ alloyed materials with high li W pHSHSssSHG HwWipa-4lfe ": - i Vr is: b-t :. . . .SB., - ,,, .- ;; .. ;;, -; -., Provides 1SHROSHRY §§§ with I S-J6ftH af-Tv (v.-l ... 3- .. Bf ... e., 5l-, М - - --- ----- 1, - .. their reliable operation. .1, The method 2 is known, according to which in | ise "" iWaa "aei" saft3itaeaMh eiee esee ..:,: r ..- ....; req; a single connection to the details of one disfeend stall you came out of the antifriction “I # SHYGna reebe, and aru ga - from afe made phosphate. i7- - - - . -.----. - - -jj- - - - -... cp ensure reliable operation,. ,, .., - ii rn-i, fifit ...-- .-., ,, - .. IB of a threaded connection must be pro- vided | VDygöl é1zS u Us shikoy, eBe lB cra i3 p epTOl37T sylg ogr8d amp - .l emery yielding strength of one of the : --- j - i ---- h -. i.-.-.---. ---- - - - - .- - -1. - --- the smaller value of the limit is taken - - -L l - - - - I KUCHESTN)., H. I 4. n

726373 In the event of plastic deformation of the thread, re-tightening it after unscrewing makes it difficult to c. Based on this, in the initial state of the threaded joint, it is not necessary to provide sufficient gaps with allowance for possible plastic defamations if one of the threaded elements is tightened to plastic with then unscrewing. The aim of the invention is to increase reliability and durability in complexity. In accordance with the invention, this goal is achieved by the fact that Power introducing lubricant into the embedded thread dissolved granular substance, the hardness and strength of the grains of which exceeds the hardness and strength of the thread material, and then alternated turns one rez bovogo element relative to the other with agruzheniem one of these axial force when moving it along cut bovogo portion of the other element. Grains of a granular substance should have dimensions determined from the relation where (3 "grain size; t) is the tolerance of the average thread diameter ;. oL is the angle at the top of the thread profile. Grain in contact with both threads on the joint,. gives a nickname with the same strength, and the likelihood of insertion of grain into one of them depends on the relative hardness and strength of materials of the threaded elements, the area of contact of the grain with the surface of the thread and the degree of its roughness (less likely that the grain is embedded into the rougher surface) than the less rough), i.e. the probability (P) of an individual grain in the surface of the turns of one of the threaded elements (moving or stationary) is: - e .. t-sш r.el.podv el.podv ek -Under t 9N.no | itft EL-UNDUS r.el.napodv Tee,. „epo№ & nnepolv-firmly el.nepodv be material, the threaded portion of the stationary member; - hardness of material EA-10AB. the threaded part of the movable element; close to contact on with the surface of the thread of the fixed element; S dd sub area of contact of the grain with the surface of the thread of the moving element; j is the coefficient of rough. the surface of the thread thread. The nature of the interaction of the grain with the material of the thread, which determines the development of cutting or friction processes in the contact zone, has a significant impact on the reliability of the thread connection when it is reused. When a granular substance is introduced into a threaded joint, an intensity occurs. the active introduction of grains into the material and a sufficiently strong anchorage in the base of the metal (alloy) possessing comp. lower hardness and strength than the material of the grains. As a result of alternating turns of the threaded elements and the resulting normal and tangential forces, the surface layer of the thread becomes saturated with implanted grains (at the initial moment of rotation the grains are rolled and slide between the thread planes, then they are inserted into the surface layer of the thread). Grains that have penetrated to a sufficiently large depth in the plate material of the thread and at ET.OM having a rounded shape practically exclude the possibility of cutting. Basically, the process of friction prevails. Grains that are located between the surfaces of the thread, also can not be cut, as the grains, embedded in one of the surfaces of the thread, but not in contact with the other. These grains may roll and slide before encountering the implanted grains. If they fall between the embedded grains, they will contribute to their further indentation (with the application of the main force) and prevent the occurrence of metallic bonds between the conc-p; j2FFf36

clocking surfaces of the thread. At the purpose of its threaded part of the zone of contact of the thread, neobodimy nants sityavSty of the presence of free grains, the dimensions of which are within the limits of the ratio indicated earlier. The proposed method of processing is | The surface of the thread is traced. Elements of a threaded connection, f - "C 1; : those of ti g (bolt), threaded ki (nuts) and locknuts, size LLO / L-ino3 lj3g «il vjiif. X 1.0 KL.2 made of. material 14X17H2 GOST 5949-75 s - h .: hardness in the delivery condition HB 127-197 and yield strength, 2 j "-. & kgf / mm, washed in gasoline Br-1 GOST and blown dry compressed air after which the granular material is prepared for application to the threaded part of the elements .. 30 Diamond powder 60/40 grit (GOST 9206-70) is mixed with diode-methane (for good dispersion and prevention of the formation of sticky particles) in a ratio of 5 weight, h. 25 diamond powder ca 1 weight.h. diode chletana .. On the threaded parts of the above parts nanosc t prepared composition. The rods are fixed still and the thread bush is run through the entire thread of the rod, evenly spread the applied composition to the windings and fill them with cavities between them. A lock nut is screwed on the t gu and pod-35 is placed on the end surface of the threaded sleeve. In this case, the lock nuts are tightened by a design force corresponding to a value of 0,, 9 of the force determined by the yield strength of the material 14X17H2. In the process of applying force to threaded materials, the diamond powder grains are embedded and firmly anchored into the material of the threaded part of the ale. cops. After that, tighten the locking nut over the threaded part of the rod for a length equal to its height, and press the threaded sleeve against the end surface of the counter with the specified force. The aforementioned operation is performed until the entire threaded part of the rod is completely passed, after which the threaded connection is disassembled and the elements are washed into a bin. Aine BP-l followed by purging with dry compressed air. During the final installation of the threaded connection rfo the functional

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Claims (3)

on the same grain, mixed with 15 I (bpc with a gap of OKB TWrTfT 179-72. in a ratio of 1 part by weight n6 |) to 1 ve. h. lubrication. Shsl Eanovkov of the bovine elements of the connection of the endgamer g. -; ü p & 1 á a; W | and 11 ch 1 | eChMyim a1sh "b". the force corresponding to a value of 0.8–0.9 of the force determined by the limit —a a Jafeil.Jfi-tf ji -...- ,, tf, v, ria, -, yit, i, -; t action. atyushgb material. The residues of the applied lubricant composition, displaced by% 6W pr1GF on the open threaded parts of the parts, are removed. The proposed method makes it possible to use materials of the same name with Shig Shiyeshtesh-iziko-mechanical properties, which means that it is designed for the manufacture of highly responsible elements. In addition, the method makes it possible to simplify the technology of threading threaded joints that are used repeatedly as the operation of applying metal coatings on threads of pipes with threaded threads requires the manufacture of non-standard threads of these gauges to check the quality of threads and a special cutting tool. tooling with appropriate tolerances (understated), taking into account the thickness of the applied coatings, and the proposed method eliminates the coating on the threads. Reliable operation of the threaded joint, made in accordance with the proposed method, makes it possible, under difficult conditions of operation, to ensure long-term use of an external adjustment of the relative position of the valve. Claims 1. A method for preventing materials from seizing predominantly in threaded connections containing a bolt and -....., tf-i ---- rf4 -ti, 1-.1G,.-.- .. V ... I.-i-. -: -aiku, by inserting a smear substance into the threaded part, so that FlieHbio is one (lv.i.4S-; 4 Abf -.---- ft-- - - yf ., i.-..-J: tu-bsttG connection, -.- gi.CH,. „.,. r. .... s ...... ..,. ef. iг CN: S; K. 7,726 threads introduce a granular substance, the hardness and strength of the grains of which exceed the hardness and strength of the materials of the compound, and then alternate turns of the nut with respect to the bolt with the loading, axial force of the nut. 2. The method according to p. 1, about tl And h and y - y and i with the fact that the size of the ferries has determined $ 1yuT (: from a ratio of 2 T 2 where 4 is the grain size; to is the tolerance of the average thread diameter;. Ct - angle at the top of the thread. 5 738 3. The method according to claim 1, wherein the lubricant consists of a plastic lubricant and synthetic diamond powder in the form of grains, and the weight of the diamond powder is 30-50% of the total weight of the lubricant. Sources of information taken into account in the examination 1. UK patent number 1460888, cl. F 16 B 33/06, 1977. 2, USSR Copyright Certificate No. 495455, cl. F16 33/06, 1975.