RU2646179C1 - Method for processing drill bit foot - Google Patents

Abstract

FIELD: machine engineering.

SUBSTANCE: method includes processing of basic shank surfaces, a dihedral angle, a trunnion having angular curvature and a small support. Centering holes are preliminary made in the trunnion foot which is made at an angle to the axis of the dihedral angle. The foot is set with a centering hole on the floating center fixed in the spindle of the machine. Then it is pressed by its rotating center mounted in quill of the back poppet through the centering hole located at the end of the small support.

EFFECT: simple adjustment of the machine, installation and removal of the part from the machine, no large range of the complex devices and their accessories is required.

3 dwg, 1 ex

Description

The invention relates to the field of well drilling and can be used in the manufacture of cone drill bits.

A known method of processing the legs of a cone bit with a pin having an angular displacement of the axes (USO), in which the fixation of the legs is made at a dihedral angle; first, the base surfaces are processed on the workpiece of the reference leg, then the reference leg is mounted in a special turning device with floating adjustment, the axis of the leg of the leg is set to the desired parameters, the leg of the leg is fixed and processed (patent of the Russian Federation No. 2319581, B23 B 1/00, publ. 20.03 .2008).

The disadvantages of this method are the complexity of manufacturing the fixture itself, the time it takes to install and expose the part, adjust the fixture, the mass of the fixture and the large distance from the spindle to the center of mass of the fixture, which causes an increased load on the spindle of the lathe.

Closest to the proposed invention is a method of manufacturing paws of a cone bit with an angular displacement of the paw axle (USO), in which the leg is mounted on a dihedral and on the technological hole on the base plates located in the upper plate of the turning chuck and pressed with a hydraulic clamp, the USO is provided by the design of the base plates; the chuck is attached to the lathe spindle cantilever (see Appendix 1).

The disadvantages of the prototype are the large weight of the cartridge, the complex design of the hydraulic device. For each USO for each type of paw forging, it is necessary to make a complex calculation of the geometry of the base plates, the difficulty in manufacturing the base plates, the difficulty of installing the paws in the fixture, the large distance from the end face of the spindle to the point of center of mass of the fixture.

The aim of the invention is to provide a method of processing the trunnion paws of a cone bit with an angular displacement of the axis in the centers without installing the part in the cartridge.

The technical result consists in increasing the service life of lathes with a horizontal spindle axis.

The specified technical result is achieved by the fact that in the method of processing the paw of the drill bit, including the processing of the base surfaces of the shank, dihedral angle, trunnion having an angled turn, according to the invention, centering holes are made in the trunnion trunnion, made at an angle to the axis of the dihedral, the paw is installed with a centering hole on the floating center, mounted in the spindle of the machine, and pressed by the rotating center installed in the quill of the tailstock, through the centering hole located with end of a small support.

Due to the fact that the paw is installed in the centering holes, the auxiliary time of installation and removal of the part is significantly reduced, because putting the paw in the device is no longer required; the center of gravity is located much closer to the end face of the machine spindle; the weight of the device itself is much less than the design of the cartridge variant; the unloading system of the spindle axis and tailstock of the machine increases the working life of the machine components; when using special equipment, it is possible to more accurately balance the device, and therefore increase the cutting speed of the processing.

In the attached FIG. 1 shows a control circuit for the parameters of the angular displacement of the axis (USO) and parallel displacement of the axis (OSS); in FIG. 2 - diagram of the installation of the paws in the proposed turning device (center option); in FIG. 3 - control circuit USO and PSO after preliminary grooving of the trunnion paws.

The method is implemented as follows.

Preliminarily, on the back of the paw 5 (Fig. 1) and on the end of the small sliding support, the platforms A and B are located perpendicular to the axis of the paw axle 5. At these sites, the centering holes 12 are machined along the axis of the paw axles 12. Check the alignment of the alignment holes by checking the distance from the surface of the base plate USO 7 to the spherical pin 3 in two places D1 and D2, respectively. The permissible difference in these sizes should be no more than 0.2 mm. The turning device for processing the paw axle 5, consisting of the face plate 13, on which the housing with the floating center 21 is located, is mounted on the spindle of the lathe 15. On the face plate 13 there are brackets 16 for fixing the shank of the foot 5, designed to transmit rotation from the spindle of the machine 15, and counterweights 14 for balancing the turning fixture. Adjusting screws 17 are located on the lateral and lower slats 16. A rotary center 20 is installed in the pins of the tailstock 22 of the lathe. The legs 5 are mounted on the floating center 19 in the centering hole 12 (Fig. 1) on the back of the legs 5. The rotary center 20 moves to falling into the centering hole 12 from the side of the end of the small sliding support and continues to move until it touches surface B on the back of the paw 5 with the base surface 18 of the body of the floating center 21 and clamps the paw 5 with the rotating center 20.

After installing the legs 5 produce a control groove diameter of the axle. The height of the groove should be at least 40 mm (Fig. 3). Then the paw 5 is removed from the machine and installed on the control prism 1. The control of the angular displacement of the axis (USO) and the size of the parallel displacement of the axis (USO) is carried out by measuring the distance between the plane of the base plate USO 7 to the processed diameter of the control groove in 2 places L1 and L2 respectively. The size from the axis of the pre-milled dihedral 4 to the plane of the base plate of the USO 7, from which L1 and L2 is measured, is plotted on the end face of the USO 7 base plate. If the sizes of USO and PSO fall into the tolerance field, they begin processing the first part. After processing the legs 5 of the first part, all parameters are also checked.

The present invention is advantageous when using lathes with a horizontal spindle axis. The device has a lower weight, the center of mass is located closer to the spindle. The invention provides ease of setup of the machine, installation and removal of parts from the machine. Also, a large range of complex fixtures and their components is not required.

Claims (1)

A method of processing a paw of a drill bit, including processing the base surfaces of a shank, a dihedral angle, a trunnion having an angled twist and a small support, characterized in that centering holes are made in the paw trunnion, made at an angle to the axis of the dihedral angle, the paw is mounted with one centering hole on the floating center, mounted in the spindle of the machine, and pressed by the rotating center installed in the quill of the tailstock, through another centering hole located at the end of the small support.

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