RU2271269C1 - Tool for ultrasonic working of cone thread of parts - Google Patents

Abstract

FIELD: combination working of metals, restoration and strengthening of cone threaded surfaces.

SUBSTANCE: tool used, mainly for working oil production pipes includes body having in outlet end working zone with threaded surface reciprocal to worked thread. In order to increase useful life period and to provide fault-free operation, threaded surface of tool has normal values of conicity, mean diameter in main plane, profile angle and pitch for worked thread. Threaded surface has height of thread profile more than normal profile height of worked thread but less than normal value of height of initial acute-angle profile from which standard rounding radius of profile indentation of worked thread is extracted. Rounding radius of apex of threaded surface profile may be less than standard rounding radius of indentation of worked thread but it is more than half of said value.

EFFECT: increased useful life period of worked parts.

2 cl, 3 dwg

Description

The invention relates to the field of combined metal processing and can be used in the restoration and hardening of conical threaded surfaces of parts and products, mainly drill, casing, tubing and couplings, as well as in the preparation for operation of conical threaded surfaces of new parts and products.

A known tool for the ultrasonic treatment of conical threaded joints, for example, oilfield pipes, containing a threaded working surface that responds to the machined thread, with grooves located on the working surface and intersecting the directions of the thread, with a hardening wear-resistant coating applied to the working surface with strips of a certain thickness and width along the grooves on the front, rear contact surfaces of the thread, on its tops and troughs. In this case, the tool can be made in the form of a tap or a die (RF Patent No. 2141890, IPC В 23 Р 6/00, 11/27/1999).

A disadvantage of the known tool is the complexity of its manufacture.

Closest to the claimed invention is a tool for ultrasonic processing, comprising a housing, at the output end of which there is a working area with a threaded surface, the reciprocal machined thread (RF Patent No. 2092291, IPC В 23 Р 6/00, 10/10/1997 - prototype).

The disadvantage of this tool is that it does not provide machining of the groove of the thread to a depth exceeding the standard for the machined thread.

The problem to which the invention is directed is to increase the life of the standard service of parts and products with tapered threads, in particular pipes and couplings, that is, to increase the period of their trouble-free operation.

The technical result of the invention is to increase the reliability and environmental safety of the operation of equipment, for example, threaded oilfield pipes, while reducing the specific consumption of pipes per unit volume of produced products, which is achieved by increasing the tensile and bending strength of the joint by finishing and hardening the conical thread of pipe parts additionally in the area of the bottom of the groove of the profile of their thread.

The technical result is achieved by the fact that in the tool for ultrasonic processing of tapered threads of parts containing a housing, at the output end of which there is a working area with a threaded surface, a reciprocal machined thread, according to the invention, the threaded surface is made in accordance with the standards of taper, average diameter in the main plane, profile angle and step for the processed thread and has a profile height that exceeds the standard for the processed thread, but less than the standard height of the original of an acute-angled profile, reduced to a normative radius cavity profile machined thread.

The achievement of the specified technical result also contributes to the fact that the radius of curvature of the top of the profile of the threaded surface is less than the standard radius of curvature of the cavity of the processed thread, but more than half.

The invention is illustrated by drawings, where:

figure 1 presents the tool type "die" for ultrasonic processing of the external conical thread of the part - the nipple of the drill pipe lock;

figure 2 presents the tool type "tap" for ultrasonic processing of the internal thread of the part - the coupling of the drill pipe lock;

figure 3 shows the pairing of the profiles of the threaded surfaces of the tool and the part when they are contacted by the front (insertion) faces during the final make-up stage, but before its completion (remote element A for figures 1 and 2).

Legend:

r _i is the reduced radius of curvature of the tip of the thread profile of the tool;

h _1i and r _1i - increased height and radius of curvature of the tool depression;

α and h ₁ - standard angle and profile height of the processed thread;

r ₁ - standard radius of curvature of the hollow of the profile of the machined thread;

P is the regulatory step of the processed thread;

N is the normative height of the initial acute-angled thread profile;

h is the normative working height of the profile of the processed thread;

G is the front (insertion) side of the profile of the machined thread;

G _i - the front side of the profile of the threaded surface of the tool;

B - back (load) side of the profile of the thread being machined;

In _i - the back side of the profile of the threaded surface of the tool.

The proposed tool die (figure 1) and the tool tap (figure 2) contain a housing 1, at the input end 2 of which there is a threaded device 3 for removably attaching the housing 1 to the waveguide 4, supplying ultrasonic vibrations from an external source (not shown). At the output free end 5, there is a working zone 6 with a threaded surface 7, the corresponding machined thread 8, and the surface 7 corresponds to the thread 8 according to the standards of taper, average diameter in the main plane, profile angle α and step P. The length l of zone 6 corresponds to the standard for the machined threads over the length of the external thread section with a full profile.

Description of the tool.

A die tool or a tap is used in preparing for use and / or restoring the tapered thread of the part, for example, the threaded section 6 of the nipple part 9 (Fig. 1) or the coupling part 10 (Fig. 2) of the drill pipe lock, by ultrasonic finishing and hardening processing. Detail 9 or 10 of the lock fail, for example, by means of a rotational-translational movement mechanism (not shown) to the output end 5 of the tool body 1 and screw its working area 6 with the machined thread 8.

When the specified torque value is lower than the normative value for the operation of the pipe, the rotational-translational movement mechanism is stopped and an external source of ultrasonic vibrations is turned on, which are transmitted through the waveguide 4 to the housing 1, its working area 6 with a threaded surface 7 and a thread 8 of a part 9 or 10. In this case, collisions and rebounds of the threaded surfaces 7 and 8 by the front (G and G _i ) or rear (B and B _i ) faces occur, which ensures the processing of faces G or B. In contrast to the prototype, in the stop phase of the mechanism about a given threshold value of torque, make-up leads to direct contact of the tip of the thread profile of the tool with a reduced radius r ₁ , the rounding and the bottom of the groove of the machined thread 8 with a significantly larger radius r ₁ . This provides ultrasonic finishing and hardening treatment of the base of the leg of the profile and the bottom of the groove, increasing the strength of the threaded section of the workpiece, in particular, tensile and bending.

The operation of the tool type "tap" (figure 2) is not separately illustrated, because it is similar to the above and the remote element A of the drawing corresponds to figure 3.

A comparative analysis of the known tool and the proposed one shows significant advantages of the last of them, ensuring the achievement of the intended technical result, in particular, the resistance of the threaded joints of the tubing machined by the proposed tool exceeded twice the resistance of the pipes processed by the known tool.

Claims (2)

1. A tool for ultrasonic processing of conical threads of parts, mainly oilfield pipes, comprising a housing, at the output end of which there is a working area with a threaded surface, a reciprocal machined thread, characterized in that the threaded surface is made in accordance with the standards of taper, average diameter in the main plane, angle profile and pitch for the machined thread and has a profile height that exceeds the standard for the machined thread, but less than the standard height of the original a rectangular profile reduced by the standard radius of curvature of the hollow of the profile of the thread being machined. 2. The tool according to claim 1, characterized in that the radius of curvature of the top of the profile of the threaded surface is made smaller than the standard radius of curvature of the cavity of the machined thread, but more than half of it.

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