Patent UA-101711-U (UA)
Title: Method of assembly of the rolling cutter bit
Inventor: SOKOLOVSKIY VOLODYMYR PETROVYCH
IPC: E21B10/08
Filed: 2015-04-08
Abstract: A method of the assembly of the rolling cutter bit includes the accommodation on bearings in the rolling cutter, arranged on the legs of the rolling cutter bit through the welded joints of the legs of the rolling cutter but with its case, in its case is placed the valve, the check of rotation of the rolling cutters and the bit shock about the vertical axis. The legs of the rolling cutter bit, prepared in assembly, clean the weld zone, removing the oil and the dirt. The size of the welds is set using the reference samples, having the parameters ensuring the maximum mechanical strength of the bit under the operational load and minimum beating towards the vertical axe, the preliminary check of the bit’s case to find the burrs and nicks at the interface of the bit case and legs, attached to the case is made, wherein the trimming and the smoothing out of the holes is made, as well, as check of the legs as to the burrs and nicks on the seat liner, the blowing of holes in the bit case and set the bit case threaded portion down, and then placed in the bit case nozzle and fixed in the housing inner ring after which establish legs with cutters mounted so that the axis cones were sent to the center bit and check bit ahead of the curve legs using the indicator and check radial runout cutters. If necessary, make adjustments and control the diameter of the bit. The legs are fixed and welded on both sides to the case of the rolling cutter bit and in relation to each leg verify the correct installation of the lock cutter and checked is its rotation by hand, and then controlled is the weld connection with clutches of the bit case, the lack of the long scores, the incomplete fusion and sagging, and after welding check radial runout bit. Then install fully assembled chisel on a conductive surface of the mounting table and the threaded portion of the bit case establish a protective cap with collar and secured therein copper clamp connected to the welding machine, and then brewed by welding in a neutral environment joints connecting each leg bit with her case periodically turning the bit after each pass of the weld and perform cutting control joints filling with ultrasound, visually inspect the presence of scores of shells in the base metal. Then smooth out the welds around the seam zone, as well as the feet and the surface of the bit case from welding spatter in one level with the base metal, and blunt the sharp edges of transitions and combinations to form a radius of curvature. After this bit is set on the bench table, baits into the cabinet openings teeth, hammer them with a hammer until it stops and make the run-in bit more than four minutes, and then check the size legs bit ahead of the curve. Check the different altitudinal cutters, and then check the geometric parameters of welds as compared with the sample - a reference bit, avoiding reducing the geometric dimensions of joints for more than 20%, thus check the quality of the welding in the presence of visible pores and cracks, as well as the presence of spatter and performance of the weld on the surface of the clutches of the bit, and check for the presence and quantity of cloves bit, the rotation of all three cones, as well as the absence of chipping cloves cones, with controlled geometrical dimensions of the internal pores seams connection leg - the case and the absence of welds defects as inclusions , pores and cracks larger than 2.0 mm, and defects not larger than 1.0 mm in an amount of three pieces in a single connection or a single defect size of 2.0 mm in one compound, wherein the internal defects is checked by an ultrasonic flaw detector and a threaded portion positioned upward bit by installing therein the separator and the valve assembly, after which movement of the control valve, the opening of which shall be 20.0 ± 3.0 mm and a return to the closed position under the influence of the spring, and then operate the valve to leak by strait kerosene leak which should not exceed one minute.