CN211638438U

CN211638438U - PCD drill bit

Info

Publication number: CN211638438U
Application number: CN202020222471.8U
Authority: CN
Inventors: 张金贤; 石锡祥
Original assignee: Xiamen Xiazhi Technology Tool Co ltd
Current assignee: Xiamen Xiazhi Technology Tool Co ltd
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-10-09
Anticipated expiration: 2030-02-28

Abstract

The utility model discloses a PCD drill bit, it includes tungsten steel drillstock and PCD drill bit seted up V type interface on the sword footpath of tungsten steel drillstock the fixed being equipped with of drill bit portion of PCD drill bit with the V type that the V type interface on the sword footpath of tungsten steel drillstock corresponds is protruding it has spiral helicine chip groove to process on the drill bit. The PCD drill bit of the utility model adopts the PCD composite sheet, the whole top of the drill bit is made of the polycrystalline diamond material, the product has high hardness, abrasion resistance and long service life, and the PCD drill bit is welded by a specific V-shaped structure, the contact of the welding surface is larger, and the strength is high; meanwhile, the effective edge length of the drill bit can be increased through the structure, and the application range of the drill bit is widened.

Description

PCD drill bit

Technical Field

The utility model relates to a product processing technology field, concretely relates to PCD drill bit.

Background

The drill bit is a cutter, and is mainly used for forming holes or processing on the surfaces of the holes, common drill bits are high-speed steel drill bits and hard alloy drill bits, but the hard alloy drill bits are difficult to realize aiming at certain materials with high hardness and high processing difficulty, polycrystalline diamond (PCD) drill bits are mostly adopted, most of the existing polycrystalline diamond (PCD) drill bits are formed by welding PCD composite sheets on the front part of a cutter body, the PCD composite sheets are of double-layer structures, one surface of each PCD composite sheet is a non-weldable polycrystalline diamond layer, and the other surface of each PCD composite sheet is a weldable hard alloy substrate layer; horizontal welding or concave hole welding is adopted mostly, and although the horizontal welding has simple process and high production efficiency, the welding contact surface is small, the welding strength is low, the rigidity is weak, so that the drill bit is easy to damage and the service life is short; the concave hole welding is characterized in that the concave hole is formed in the drill handle part, the drill point is inserted into the concave hole for welding, the welding contact area is increased, the welding strength is improved, the requirement on the machining precision of the matching hole of the drill point and the drill handle is high, the machining efficiency is low, and the production cost is high. And no matter horizontal welding or concave hole welding, the length of the drill point is limited in size.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a PCD drill bit, its simple structure, welding strength is high, and mechanical properties and cutting performance are strong.

The utility model relates to a PCD drill bit it includes tungsten steel drillstock and PCD drill bit have seted up V type interface on the sword footpath of tungsten steel drillstock the fixed being equipped with of brill sword portion of PCD drill bit with the V type that V type interface corresponds is protruding, the tungsten steel drillstock with the PCD drill bit passes through V type structure weld forming it has spiral helicine chip groove to process on the drill bit.

Preferably, a helical angle is formed between the chip discharge groove and the central axis of the drill point, and the angle of the helical angle is 10-55 degrees.

Preferably, the interior angle of the V-shaped interface is 60-150 degrees.

Preferably, the apex angle of the V-shaped protrusion is 60 ° to 150 °.

Preferably, a tip angle is provided on the drill point.

The utility model has the advantages that: the PCD drill bit of the utility model adopts the PCD composite sheet, the whole top of the drill bit is made of the polycrystalline diamond material, the product has high hardness, abrasion resistance and long service life, and the PCD drill bit is welded by a specific V-shaped structure, the contact of the welding surface is larger, and the strength is high; meanwhile, the effective edge length of the drill bit can be increased through the structure, and the application range of the drill bit is widened.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;

the drill comprises a tungsten steel drill handle 1, a PCD drill point 2, a V-shaped interface 3, a V-shaped bulge 4, a chip groove 5 and a drill edge part 6.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

As shown in fig. 1, a PCD drill bit comprises a tungsten steel drill handle 1 and a PCD drill point 2, wherein the PCD drill point 2 is a PCD compact, the PCD drill point 2 is made of polycrystalline diamond material composite tungsten steel material, and the wear resistance of the PCD drill point is at least 100 times that of hard alloy material; the cutting edge diameter of the tungsten steel drill handle 1 is provided with a V-shaped connector 3, the inner angle of the V-shaped connector 3 is 100 degrees, a V-shaped bulge 4 corresponding to the V-shaped connector 3 on the cutting edge diameter of the tungsten steel drill handle 1 is fixedly arranged on a drill cutting edge part 6 of the PCD drill needle 2, the vertex angle of the V-shaped bulge 4 is 100 degrees, and the tungsten steel drill handle 1 and the PCD drill needle 2 are welded and formed through a V-shaped structure; the drill point 2 is provided with a front end angle and a spiral chip groove 5, a spiral angle is formed between the chip groove 5 and the central axis of the PCD drill point 2, and the angle of the spiral angle is 30 degrees. Compared with common horizontal welding, the V-shaped welding of the design has the advantages that although the welding time is increased, the welding contact surface is larger, the welding strength is high, the rigidity of the product is ensured, and the service life of the product is obviously prolonged; simultaneously V type welding compares with common shrinkage pool welding, and although the welding contact surface is not as big as the shrinkage pool welding, its processing technology will be simpler than the shrinkage pool welding, and production efficiency is high, low in production cost, and the practicality is stronger. Common drill bit adopts horizontal welding and shrinkage pool welding more, if drill point length overlength, because of the welding position at the combination position of drill point and drillstock, can lead to the holistic intensity of drill bit to reduce, and the rigidity is less strong, and the utility model discloses a PCD drill bit, its welding adopt special V type welding, and the welding position is the carbide end of the compound piece of PCD, has shortened the length that needs to carry out the welded part on the drill bit, under the condition of same atress, because of the size shortening of welding part, the diversion has increased the effective length of drill edge, has increased the effective sword length of drill bit.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A PCD drill bit is characterized by comprising a tungsten steel drill handle and a PCD drill bit, wherein a V-shaped interface is arranged on the diameter of a blade of the tungsten steel drill handle, a V-shaped bulge corresponding to the V-shaped interface is fixedly arranged on a drill blade part of the PCD drill bit, the tungsten steel drill handle and the PCD drill bit are welded and formed through a V-shaped structure, and a spiral chip removal groove is processed on the drill bit.

2. A PCD drill bit as claimed in claim 1, wherein the flutes and the central axis of the drill pin define a helix angle therebetween, the helix angle being in the range of 10 ° to 55 °.

3. A PCD drill bit as claimed in claim 1, wherein the V-shaped interface has an internal angle of between 60 ° and 150 °.

4. A PCD drill bit as claimed in claim 1, characterised in that the apex angle of the V-shaped projection is in the range 60 ° to 150 °.

5. A PCD drill bit as claimed in claim 1, characterised in that a nose angle is provided on the drill bit.