Multi-edge hard alloy cutting tooth

Abstract

The utility model discloses a multi-blade hard alloy cutting tooth which comprises a cylindrical base body, and an upper outer cutting unit and a lower outer cutting unit are arranged on the outer wall of the cylindrical base body. An upper concave structure is arranged on the top surface of the cylindrical base body, and a lower concave structure is arranged on the bottom surface of the cylindrical base body; an upper inner cutting unit is arranged in the center of the upper inner concave structure, and a lower inner cutting unit is arranged in the center of the lower inner concave structure. Good penetration capacity is achieved through the sharp cutting edges, and the stress concentration effect is improved, so that the cutting efficiency is improved. Due to the arrangement of the concave structure, the cutting teeth have good chip breaking capacity, formation of long-strip-shaped iron chips can be reduced, and repeated breaking caused by accumulation of the iron chips at the bottom of the drill bit is prevented. According to the utility model, large-batch production can be realized, and the nonuniformity of randomly crushed hard alloy particles is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to petroleum drilling tool technical field, concretely is a kind of multi-blade hard alloy cutting tooth. BACKGROUND

[0002] In the drilling and workover operation of oil field, a large number of milling tools are used in the treatment of various types of pipe and other downhole accessories such as oil pipes, drill pipes, packers and other workover operations and casing windowing sidetracking operations, and the milling efficiency directly affects the construction efficiency and downhole safety. The cutting material of the milling tool is hard alloy, which is usually made of hard compounds such as tungsten carbide and bonding metals through powder metallurgy process, and has the characteristics of high hardness and high wear resistance. At present, the hard alloy cutting tooth of the conventional milling tool is randomly broken into small particles, and there are problems of poor cutting ability and low cutting efficiency when cutting steel and other materials. Therefore, the development of a regular-shaped multi-blade hard alloy cutting tooth is the key to improving the operation efficiency of the milling tool.

[0003] Publication No. CN118462062A discloses a multi-ridge PDC tooth and drill bit for strengthening rock breaking, which comprises a hard alloy base and a polycrystalline diamond layer. The cross section of the hard alloy base is circular, and the cross section of the lower end surface of the polycrystalline diamond layer is also circular. The polycrystalline diamond layer is connected to the upper part of the hard alloy base. The upper surface of the polycrystalline diamond layer includes two fan-shaped curved surfaces, two arc surfaces and a plane. The two fan-shaped curved surfaces and the two arc surfaces form ridge-shaped main cutting edges, respectively. The plane connects the two fan-shaped curved surfaces, and the two arc surfaces form side flow faces outside the flow guide ridge. The multi-ridge PDC tooth structure is simple, which can reduce the tangential load and rock breaking specific work of the PDC tooth, reduce the temperature around the tooth during drilling, avoid stick-slip vibration, improve the drilling efficiency and thermal stability of the PDC tooth.

[0004] The existing technology does not have as good an eating capacity as the utility model in downhole milling.

[0005] Publication No. CN210798849U discloses a multi-cutting-edge diamond composite piece, which comprises a diamond composite layer and a hard alloy base. At least three cutting edges are arranged around the end surface of the diamond composite layer. Each cutting edge is formed by the intersection of two inclined surfaces at a certain angle. The inclined surfaces are inclined with respect to the bottom surface of the hard alloy base. The ends of all cutting edges away from the annular side surface of the diamond composite layer converge at the center of the end surface of the diamond composite layer. The cutting edge has good aggressiveness, and the cutting efficiency and heat dissipation area are better than those of the flat tooth, which helps to improve the drilling efficiency of the drill bit in complex formations.

[0006] The existing technology does not have as good an eating capacity and chip removal efficiency as the utility model in downhole milling.

[0007] Publication No. US7913432B2 discloses a cutting tooth assembly with reversible teeth, the cutting tooth includes a main body, the upper end and lower end of the main body are provided with cutting units, the cutting unit includes four cutting edges, the outer wall of the cutting edge is flush with the outer wall of the main body, the inner wall of the cutting edge is a tapered surface, and the main body is provided with a mounting hole at the center of the four cutting edges. It is suitable for application in a rotary cutting machine.

[0008] The cutting tooth of the prior art is used for downhole milling, and the cutting tooth has lower cutting ability and cutting efficiency than the utility model.

[0009] In summary, the technical solutions of the above disclosed technologies, the technical problems to be solved and the beneficial effects produced are all different from those of the utility model, and the above disclosed technology documents do not have technical inspiration for more technical features and technical problems to be solved and beneficial effects of the utility model. Utility model content

[0010] In view of the above defects of the prior art, the utility model aims to provide a multi-blade hard alloy cutting tooth.

[0011] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0012] On the one hand, the utility model provides a multi-blade hard alloy cutting tooth, which includes a cylindrical base body, an upper outer cutting unit and a lower outer cutting unit are arranged on the outer wall of the cylindrical base body; an upper inner recess structure is arranged on the top surface of the cylindrical base body, and a lower inner recess structure is arranged on the bottom surface of the cylindrical base body; an upper inner cutting unit is arranged at the center of the upper inner recess structure, and a lower inner cutting unit is arranged at the center of the lower inner recess structure.

[0013] Further, the upper outer cutting unit and the lower outer cutting unit are symmetrically distributed with the horizontal center surface of the cylindrical base body as the symmetry surface.

[0014] Further, the upper outer cutting unit or the lower outer cutting unit includes at least four outer sharp cutting edges, all the outer sharp cutting edges are uniformly arranged along the circumferential direction of the cylindrical base body, and the outer endpoints of all the outer sharp cutting edges enclose an outer peripheral cylindrical surface, and the included angle between the edge of the outer sharp cutting edge and the outer peripheral cylindrical surface is 0-45°.

[0015] Further, the upper inner recess structure and the lower inner recess structure are both conical recesses, and the included angle between the tapered surface of the conical recess and the opening plane is 15-30°.

[0016] Further, the upper inner cutting unit is conical, the upper inner cutting unit is provided with at least four upper inner sharp cutting edges, and the included angle between the edge of the upper inner sharp cutting edge and the central axis of the cylindrical base body is 0-60°.

[0017] Further, the upper inner cutting unit protrudes out of or retracts into the upper outer cutting unit.

[0018] Further, the lower inner cutting unit is conical, and the lower inner cutting unit is provided with at least four lower inner sharp cutting edges, and the included angle between the edge of the lower inner sharp cutting edge and the central axis of the cylindrical base body is 0-60°.

[0019] Further, the lower inner cutting unit is extended or retracted into the lower outer cutting unit.

[0020] Further, the cutting edge angle α of the outer sharp cutting edge, the upper inner sharp cutting edge and the lower inner sharp cutting edge is 30-90°.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1. The utility model discloses a plurality of sharp cutting edges realize good eating capacity, improve stress concentration effect and improve cutting efficiency.

[0023] 2. The utility model discloses a plurality of sharp cutting edges realize good eating capacity, improve stress concentration effect and improve cutting efficiency.

[0024] 3. The utility model discloses a plurality of sharp cutting edges realize good eating capacity, improve stress concentration effect and improve cutting efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the structural schematic diagram of the utility model embodiment 2;

[0026] Figure 2 It is the top view of the utility model embodiment 2;

[0027] Figure 3 It is the front view of the utility model embodiment 2;

[0028] Figure 4 It is the sectional view of the utility model embodiment 2;

[0029] Figure 5 It is the structural schematic diagram of the utility model embodiment 3;

[0030] Figure 6 It is the front view of the utility model embodiment 3;

[0031] Figure 7 It is the structural schematic diagram of the utility model embodiment 4;

[0032] Figure 8 It is the top view of the utility model embodiment 4;

[0033] Figure 9 It is the bottom view of the utility model embodiment 4;

[0034] Figure 10 is the front view of the embodiment 4 of the utility model, and

[0035] Figure 11 is the sectional view of the embodiment 4 of the utility model.

[0036] In the figure: first outer sharp cutting edge 101, first inner concave structure 102, first inner sharp cutting edge 103, first outer sharp cutting edge edge 104, triangular pyramid cutting edge angle α, conical concave surface and opening plane angle β, outer sharp cutting edge edge and outer peripheral cylindrical surface angle γ, inner sharp cutting edge edge and cylindrical base center axis angle δ;

[0037] Second outer sharp cutting edge 201, second inner concave structure 202, second inner sharp cutting edge 203, second inner cutting unit vertex and same side second outer cutting unit vertex distance a;

[0038] Third outer sharp cutting edge 301, third inner concave structure 302, third upper sharp cutting edge 303, third lower sharp cutting edge 304, third outer edge 305, third upper inner cutting unit vertex and same side third outer cutting unit vertex distance b, third upper inner cutting unit vertex and same side third outer cutting unit vertex distance c. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0040] Embodiment 1:

[0041] Please refer to Figures 1 to 11 The utility model provides a kind of multi-blade hard alloy cutting tooth, including cylindrical base, the cylindrical base outer wall is provided with upper outer cutting unit, lower outer cutting unit, the upper outer cutting unit, lower outer cutting unit is with cylindrical base horizontal center plane as symmetry plane, symmetrically distributed;The upper outer cutting unit or lower outer cutting unit outer middle includes 4-12 outer sharp cutting edges, all outer sharp cutting edges are evenly arranged along the circumferential direction of cylindrical base, and the outer end point of all outer sharp cutting edges encloses peripheral cylindrical surface, and the edge of outer sharp cutting edge and peripheral cylindrical surface angle γ is 0-45 °;Outer cutting unit has good eating capacity, can improve stress concentration effect to improve cutting efficiency.

[0042] The top surface of the cylindrical base body is provided with an upper inner recess structure, and the bottom surface of the cylindrical base body is provided with a lower inner recess structure, both of which are conical recesses, and the included angle β between the conical surface of the conical recess and the opening plane is 15-30°.

[0043] The upper inner recess structure is provided with an upper inner cutting unit at the center, which is conical, and the upper inner cutting unit is provided with 4-12 upper inner sharp cutting edges, and the included angle between the edge of the upper inner sharp cutting edge and the central axis of the cylindrical base body is 0-60°.

[0044] The lower inner recess structure is provided with a lower inner cutting unit at the center, which is conical, and the lower inner cutting unit includes 4-12 lower inner sharp cutting edges, and the included angle between the edge of the lower inner sharp cutting edge and the central axis of the cylindrical base body is 0-60°.

[0045] The inner recess structure and the inner cutting unit inside it have good chip breaking ability, can reduce the formation of long iron chips, and prevent the accumulation of iron chips at the bottom of the drill bit from causing repeated crushing.

[0046] The cutting edge angle α of the outer sharp cutting edge, the upper inner sharp cutting edge and the lower inner sharp cutting edge is 30-90°.

[0047] Example 2:

[0048] Based on Example 1, please refer to Figures 1 to 4 In this embodiment, the upper outer cutting unit or the lower outer cutting unit is a first outer cutting unit, the outer sharp cutting edge is a first outer sharp cutting edge 101, and the included angle γ1 between the edge 104 of the first outer sharp cutting edge and the outer peripheral cylindrical surface is 15°; the edges of the first outer sharp cutting edges in the upper outer cutting unit and the lower outer cutting unit are arranged face to face, and the first outer cutting unit includes 12 first outer sharp cutting edges 101.

[0049] The upper inner recess structure and the lower inner recess structure are both first inner recess structures 102, and the upper inner recess structure and the lower inner recess structure are symmetrical about the horizontal center surface of the cylindrical base body; the included angle β1 between the conical surface of the conical recess in the first inner recess structure 102 and the opening plane is 20°.

[0050] The upper inner cutting unit and the lower inner cutting unit are both first inner cutting units, the upper inner sharp cutting edge and the lower inner sharp cutting edge are both first inner sharp cutting edges 103, and the upper inner cutting unit and the lower inner cutting unit are symmetrical about the horizontal center surface of the cylindrical base body; the included angle δ1 between the edge of the first inner sharp cutting edge and the central axis of the cylindrical base body is 45°, and the first inner cutting unit includes 6 first inner sharp cutting edges 103.

[0051] The first inner cutting unit vertex is at the same height as the same-side first outer cutting unit vertex.

[0052] The cutting edge angle of the first outer sharp cutting edge 101 and the first inner sharp cutting edge 103 is a first cutting edge angle a1, and the first cutting edge angle a1 is 60°.

[0053] Embodiment 3:

[0054] On the basis of Embodiment 1, please refer to Figures 5 to 6 In the multi-blade hard alloy cutting tooth of the embodiment, the outer cutting unit is a second outer cutting unit, the outer sharp cutting edge is a second outer sharp cutting edge 201, and the angle γ2 between the second outer sharp cutting edge and the outer peripheral cylindrical surface is 15°. The second outer sharp cutting edge of the upper outer cutting unit is arranged face to face with the second outer sharp cutting edge of the lower outer cutting unit, and the second outer cutting unit includes 8 second outer sharp cutting edges 201.

[0055] The upper inner concave structure and the lower inner concave structure are both second inner concave structures 202, and the upper inner concave structure and the lower inner concave structure are symmetrical about the cylindrical base transverse center surface. The angle β2 between the conical surface of the second inner concave structure 202 and the opening plane is 15°.

[0056] The upper inner cutting unit and the lower inner cutting unit are both second inner cutting units, the upper inner sharp cutting edge and the lower inner sharp cutting edge are both second inner sharp cutting edges 203, and the upper inner cutting unit and the lower inner cutting unit are symmetrical about the cylindrical base transverse center surface. The angle δ2 between the second inner sharp cutting edge and the cylindrical base center axis is 45°, and the second inner cutting unit includes 4 second inner sharp cutting edges 203.

[0057] The second inner cutting unit vertex protrudes from the same-side second outer cutting unit vertex, and the distance a between the second inner cutting unit vertex and the same-side second outer cutting unit vertex is 0.8 mm.

[0058] The cutting edge angle of the second outer sharp cutting edge 201 and the second inner sharp cutting edge 203 is a second cutting edge angle a2, and the second cutting edge angle a2 is 90°, so that the second inner cutting unit becomes a pyramid.

[0059] Embodiment 4:

[0060] On the basis of Embodiment 1, please refer to Figures 7 to 1In the multi-blade hard alloy cutting tooth of the embodiment, the upper outer cutting unit or the lower outer cutting unit is a third outer cutting unit, the outer sharp cutting edge is a third outer sharp cutting edge 301, and the angle γ3 between the third outer sharp cutting edge 301 and the outer circumferential cylindrical surface is 0°, so that the upper outer cutting unit and the lower outer cutting unit are integrated to form a prism, and the third outer cutting unit includes 10 third outer sharp cutting edges 301.

[0061] The upper inner recess structure and the lower inner recess structure are both third inner recess structures 302, and the upper inner recess structure and the lower inner recess structure are symmetrical about the cylindrical base transverse center surface; and the angle β1 between the conical surface of the third inner recess structure 302 and the opening plane is 30°.

[0062] The upper inner cutting unit is a third upper inner cutting unit, the upper inner sharp cutting edge is a third upper inner sharp cutting edge 303, the angle δ3 between the third upper inner sharp cutting edge 303 and the central axis of the cylindrical base is 45°, the third upper inner cutting unit includes 6 third upper inner sharp cutting edges 303, the third upper inner cutting unit extends out of the same side third outer cutting unit, and the distance b between the vertex of the third upper inner cutting unit and the vertex of the same side third outer cutting unit is 0.6 mm.

[0063] The lower inner cutting unit is a third lower inner cutting unit, the lower inner sharp cutting edge is a third lower inner sharp cutting edge 304, the angle δ4 between the third lower inner sharp cutting edge 304 and the central axis of the cylindrical base is 45°, the third lower inner cutting unit includes 8 third lower inner sharp cutting edges 304, and the third lower inner cutting unit is retracted into the same side third outer cutting unit, and the distance c between the vertex of the third upper inner cutting unit and the vertex of the same side third outer cutting unit is 0.5 mm.

[0064] The cutting edge angles of the third outer sharp cutting edge 301, the third upper inner sharp cutting edge 303, and the third lower inner sharp cutting edge 304 are all third cutting edge angles α3, and the third cutting edge angle α3 is 60°.

[0065] Embodiment 5:

[0066] The multi-blade hard alloy cutting tooth of any one of embodiments 1 to 4 is used for drilling or workover operations in oil fields.

[0067] In use, the multi-blade hard alloy cutting tooth is welded to the milling tool body by using a hard alloy welding rod.

[0068] In the present application, any part that is not discussed in detail, the connection mode of each part in the present application, is a known technology in the technical field. Direct application is available, and no further description is needed.

[0069] In the present application, the term "a plurality of" refers to two or more, unless otherwise expressly specified. The terms "mounting", "connected", "connecting", "fixed", and the like should be understood broadly, for example, "connected" can be fixed connection, can also be detachable connection, or integrally connected; "connected" can be directly connected, can also be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0070] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation of the present application.

[0071] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-cutter hard metal cutting pick comprising a cylindrical base body, characterized in that, The outer wall of the cylindrical base body is provided with an upper outer cutting unit and a lower outer cutting unit. The top surface of the cylindrical base body is provided with an upper inner concave structure, and the bottom surface of the cylindrical base body is provided with a lower inner concave structure. The center of the upper inner concave structure is provided with an upper inner cutting unit, and the center of the lower inner concave structure is provided with a lower inner cutting unit.

2. A multi-cutter hard metal cutting tooth according to claim 1, characterized in that The upper outer cutting unit and the lower outer cutting unit are symmetrically distributed with the horizontal center surface of the cylindrical base body as the symmetry surface.

3. A multi-cutter hard metal cutting tool according to claim 2, c h a r a c t e r i z e d in that The upper outer cutting unit or the lower outer cutting unit includes at least four outer sharp cutting edges, all of which are uniformly arranged along the circumferential direction of the cylindrical base body, and the outer endpoints of all the outer sharp cutting edges enclose an outer peripheral cylindrical surface, and the edge of the outer sharp cutting edge and the outer peripheral cylindrical surface form an angle of 0-45°.

4. A multi-cutter hard metal cutting tool according to claim 3, c h a r a c t e r i z e d in that The upper inner concave structure and the lower inner concave structure are both conical concave surfaces, and the angle between the conical surface of the conical concave surface and the opening plane is 15-30°.

5. A multi-cutter hard metal cutting tool according to claim 4, c h a r a c t e r i z e d in that The upper inner cutting unit is conical, and the upper inner cutting unit is provided with at least four upper inner sharp cutting edges, and the angle between the edge of the upper inner sharp cutting edge and the central axis of the cylindrical base body is 0-60°.

6. A multi-cutter hard metal cutting tool according to claim 5, c h a r a c t e r i z e d in that The upper inner cutting unit extends out of or retracts into the upper outer cutting unit.

7. A multi-cutter hard metal cutting tool according to claim 5, c h a r a c t e r i z e d in that The lower inner cutting unit is conical, and the lower inner cutting unit is provided with at least four lower inner sharp cutting edges, and the angle between the edge of the lower inner sharp cutting edge and the central axis of the cylindrical base body is 0-60°.

8. A multi-cutter hard metal cutting tool according to claim 7, c h a r a c t e r i z e d in that The lower inner cutting unit extends out of or retracts into the lower outer cutting unit.

9. A multi-cutter hard metal cutting tool according to claim 8, c h a r a c t e r i z e d in that The cutting edge angle α of the outer sharp cutting edge, the upper inner sharp cutting edge and the lower inner sharp cutting edge is 30-90°.

Images