Diamond composite cutter head
A technology of diamond and composite knives, which is applied in construction and other directions, can solve the problems of hole wall rupture, blade shedding, and excessive consumption of tool materials, and achieve the effects of cost reduction, area reduction, and rake face area reduction
Active Publication Date: 2017-05-24
YICHANG SHENDA PETROMACHINE
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Problems solved by technology
In order to install reliably, the cemented carbide substrate of the blade (that is, the bullet-shaped substrate) needs to have a certain length, so as to ensure the reliable fixing of the blade and consume more tool materials
At the same time, the semi-open cylindrical hole used to install the blade is not a complete cylinder, so the hole wall is prone to breakage during use, causing the blade to fall off and reducing the reliability of blade installation
Method used
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Embodiment Construction
[0015] Such as figure 1 Among them, a diamond composite cutter head includes a cutter head body 1, a diamond composite blade 3 is welded to the front end of the cutter head body 1, the cutter head body 1 is obliquely installed on the drill body 2, and the diamond composite blade 3 is obliquely welded on the cutter head body 1 front end.
[0016] The rake face of the diamond composite blade 3 is a plane. The front face in this example refers to the face indicated by reference numeral 3 leads, in figure 1 displayed as a straight line.
[0017] In an optimized solution, the rake face of the diamond composite insert 3 is nearly parallel to the axis of the drill body 2 , that is, the axis 8 of the drill body.
[0018] In an optional optimization scheme, the cutting stress F of the diamond composite insert 3 is nearly parallel to the axis of the cutter body 1 , that is, the axis 7 of the cutter body. In general, closer proximity results in better results due to lower lateral for...
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A diamond compound cutting head comprises a cutting head body. A diamond compound blade is welded to the front end of the cutting head body, the cutting head body is slantly installed on a drill bit drill body, and the diamond compound blade is slantly welded to the front end of the cutting head body. The front knife face of the diamond compound blade is a plane. The front knife face of the diamond compound blade is approximately parallel to the axis of the drill bit drill body. Cutting stress of the diamond compound blade is approximately parallel to the axis of the cutting head body. By changing the installing angle of the cutting head body and the welding angle of the diamond compound blade, the angle of the cutting front knife face is changed so as to reduce the included angle between the front knife face of the diamond compound blade and the axis of the cutting head body. After the angle is changed, the area of the front knife face is reduced, the area of a poly crystal diamond layer is reduced, and the cost is reduced; the included angle between the axis of a mounting hole and the cutting speed direction is increased, and cutting stress F in the cutting process points to one end of the hemispherical cutting head body and is favorable for enabling the diamond compound cutting head to be tightly fixed in a mounting blind hole.
Description
technical field [0001] The invention relates to the field of installation of diamond composite blades, in particular to a diamond composite cutter head for oil drill bits. Background technique [0002] Diamond composite blade (Polycrystalline Diamond Compact) is a blade made of a synthetic diamond polycrystalline surface layer and a cemented carbide tungsten carbide bottom layer under high temperature and high pressure. It not only has the hardness and wear resistance of polycrystalline diamond, but also has The structural strength and impact resistance of tungsten carbide. [0003] The forming process of the diamond composite cutter head adopts a special process, and the diamond composite blade is welded on the end surface of the bullet-shaped cemented carbide substrate. At present, diamond composite cutter heads have been widely used in oil drill bits. [0004] In the prior art, one end of the bullet-shaped diamond composite cutter head is flat, and the other end is hemi...
Claims
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IPC IPC(8): E21B10/43
Inventor 付正兵张明松
Owner YICHANG SHENDA PETROMACHINE