RU35123U1 - Drill bit - Google Patents

Description

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The utility model relates to drilling equipment, namely to rock cutting tools with plate wear inserts and can be used when drilling wells with or without coring.

A drill bit is known, including a core ring with cutting inserts containing a support plate, on which main and bore-core cutting tools are spaced apart from each other, the latter having larger cross sections compared to the main ones and overlapping them, anticipating breakage, / cm . The invention of the USSR No. 530941, 04.04.07.75, op.05.10.76 /

In the well-known drill bit, although the cutters are protected from breakage, their service life is insignificant due to the low accuracy of the installation of the cutters and the reliability of their fixing by soldering.

A drill bit is also known, including a core ring with protrusions on the end surface and grooves in which cutting inserts are installed, consisting of a support plate and carbide tools welded to it, / see GOST 11108-70. Carbide-tipped crowns for core drilling of medium hard rocks. M., 1972, p. 16.17 prototype.

The disadvantage of such drill bits is their insignificant resource of work due to the lack of accuracy of the installation of cutters on the base plate and cutting inserts in the body of the drill bit, as well as the low reliability of fixing the cutters on the base plate on only one side of their abutment.

MPK7 E21B10 / 48, E21B10 / 52.

DRILL BIT

The task underlying the useful model is to increase the operational resource of the drill bit by increasing the accuracy of the installation of carbide cutters relative to each other, as well as by the inner and outer diameters of the drill bit with reliable fixing of its elements.

The problem is solved in that in the drill bit, comprising a core ring with protrusions on the end surface and grooves in which cutting inserts are installed, consisting of a support plate and carbide cutters fixed to it, according to a utility model, through longitudinal longitudinal sections are made on both sides of the support plate grooves, and on one side of the plate a series of parallel grooves are made in which carbide cutters are fixed, and on the opposite side of the plate a centering groove is made to interact with rtsom protrusion of the core ring of the drill bit. Carbide cutters are fixed in the grooves of the base plate by soldering or gluing. The ends of the protrusions of the core ring and adjacent mounting grooves of the cutting inserts are inclined in the direction of rotation of the drill bit.

The placement of the cutters in the grooves of the base plate provides guaranteed gaps between them, i.e. precise installation of the cutters relative to each other, and the presence of a centering groove ensures the accuracy of the installation of cutting inserts on the inner and outer diameters of the core ring of the drill bit. Reliability of fixing the cutters in the grooves of the base plate and cutting inserts is provided by increasing the contact area of the mating elements. The gluing of carbide cutters in the grooves of the base plate also ensures their reliable fastening, by eliminating the internal stresses inherent in the fastening of dissimilar metals by soldering. The inclination of the ends and grooves of the core ring in the direction of rotation of the drill bit allows the insert to be installed at a positive cutting angle.

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The presence of significant features distinctive from the prototype allows us to recognize the claimed device as new.

The possibility of using the inventive device in industry allows us to conclude that it meets the criterion of industrial applicability.

In FIG. 1 shows a drill bit, a plan view, in FIG. 2 is a view A in FIG. 1, FIG. 3 is a view B in FIG. 2, and FIG. 4 is an end protrusion with an installation groove of a drill bit.

The drill bit has a crown ring 1 with holes 2 and mounting grooves 3 for cutting inserts, consisting of a support plate 4 and carbide cutters 5. On one side of the support plate 4 there is a series of through parallel longitudinal grooves 6, in which carbide cutters are installed and fixed with glue 5. On the opposite side of the support plate 4, a through longitudinal centering groove 7 is made for mounting the cutting insert on the drill bit. The ends 8 of the protrusions of the core ring 1 and adjacent grooves 3 of the placement of the cutting inserts are made with an inclination in the direction of rotation of the drill bit to create a positive cutting angle. The tilt angle of ° C is of the order of Z.

Cutting inserts are installed on the ends of 8 protrusions 2 in the grooves 3 of the crown ring 1 of the drill bit. At the same time, the support plates 4 with centering grooves 7 cover the end face 8, fixing the cutting inserts on the crown ring. Then, the cutting inserts are brazed.

Carbide cutters fixed with guaranteed gaps between each other in each cutting insert are positioned symmetrically to the cutters of other inserts, forming concentric rows along the crown ring of the drill bit. This arrangement of incisors provides incomplete overlap of the face. In the process of drilling, clear annular grooves are formed with incisors following one trajectory one after another. The protrusions of the rock between the annular grooves

evenly sharpen the sides of the incisors, i.e. the process of self-sharpening takes place, increasing the service life. Strengthening the effect of self-sharpening also contributes to the inclined placement of inserts with positive cutting. Due to the development of the contact surfaces of the supporting plates with the T-carbide incisors and the crown ring, tearing of the hard alloy and cutting inserts is practically eliminated, i.e., fixing reliability is increased by about 2-3.

The use of drill bits will increase the speed of drilling holes.

Claims (3)

1. A drill bit comprising a core ring with protrusions on the end surface and grooves in which cutting inserts are installed, consisting of a support plate and carbide cutters fixed to it, characterized in that longitudinal grooves are made on both sides of the support plate, moreover, on one of sides - a series of parallel grooves in which carbide cutters are fixed, and on the other side of the plate - a centering groove for interacting with the end face of the protrusion of the core ring of the drill bit. 2. The drill bit according to claim 1, characterized in that the carbide cutters are fixed in the grooves of the base plate by gluing. 3. The drill bit according to claim 1, characterized in that the ends of the protrusions of the crown ring and adjacent mounting grooves of the cutting inserts are inclined in the direction of rotation of the drill bit.