阅读说明：本技术 一种取芯钻头 (core bit ) 是由 吴益雄 魏洪涛 陈欣宏 张贵青 李丹 于 2019-10-31 设计创作，主要内容包括：本发明的目的是提出一种使用寿命较长的取芯钻头。本发明的取芯钻头由圆筒状的金属基体和若干金刚石刀头连接而成,所述若干金刚石刀头均匀分布于金属基体的端面上；所述金刚石刀头由工作层和过渡层构成,关键在于所述过渡层埋设有若干硬质颗粒,且硬质颗粒的硬度大于过渡层的硬度。在钻孔过程中,混凝土的孔壁会首先接触到过渡层表面的硬质颗粒,进而被硬质颗粒磨削而难以或者较少接触到过渡层表面,这样就减少了对过渡层的磨损,使得过渡层能够保持原有的强度,进而避免刀头掉落。本发明的取芯钻头还提高了刀头的锋利度,并使得刀头的冷却和排渣更方便,因此具有很好的实用性和商业价值。(The invention aims to provide core bits with longer service life, which are formed by connecting a cylindrical metal base body and a plurality of diamond bits, wherein the diamond bits are uniformly distributed on the end surface of the metal base body, each diamond bit comprises a working layer and a transition layer, and the key point is that a plurality of hard particles are embedded in the transition layer, and the hardness of the hard particles is greater than that of the transition layer.)

The 1, kinds of coring bits are formed by connecting a cylindrical metal base body and a plurality of diamond tool bits, wherein the diamond tool bits are uniformly distributed on the end face of the metal base body, each diamond tool bit is composed of a working layer and a transition layer, and the diamond tool bits are characterized in that a plurality of hard particles are embedded in the transition layer, and the hardness of the hard particles is greater than that of the transition layer.

2. The core-taking drill bit as claimed in claim 1, wherein the adjacent diamond segments have a gap therebetween to form a water channel, and the lateral surfaces of the substrate are provided with water guiding grooves connected to the water channel at positions corresponding to the water channels.

3. The core-drill bit as recited in claim 1, wherein said top surface of said working layer is provided with a plurality of arcuate grooves having a center coincident with a center location of said base.

4. The core-taking drill bit as claimed in claim 1, 2 or 3, wherein the end face of the metal base body is composed of an inner arc plane, a middle arc convex part and an outer arc plane, the number of the arc convex parts corresponds to , the bottom surface of the transition layer is provided with arc concave parts corresponding to the arc convex parts to form connection planes corresponding to the inner arc plane and the outer arc plane, respectively, the arc concave parts of the transition layer are butted with the arc convex parts of the metal base body, and the transition layer is fixedly connected with the metal base body by powder metallurgy sintering.

5. The core-drill bit as recited in claim 4, wherein said arcuate projections and said arcuate recesses have a textured surface.

6. The core-taking drill bit as recited in claim 4 wherein said arcuate projections and said arcuate recesses are each triangular in cross-section.

7. Core-drill bit as claimed in claim 1, 2 or 3, characterized in that the outer side of the cutter head projects outwardly beyond the outer side of the metal basic body.

Technical Field

The invention relates to a drill bit, in particular to an core bit.

Background

The invention discloses a laser welding diamond core bit , which is widely applied to geological exploration, such as drilling and coring on concrete pile foundations of bridges, tunnels and the like, so as to detect whether a concrete pile foundation is qualified or not, and belongs to the technical field of diamond core bits.

Disclosure of Invention

The invention aims to provide core-taking drill bits with longer service life.

The core drill bit is formed by connecting a cylindrical metal base body and a plurality of diamond tool bits, wherein the diamond tool bits are uniformly distributed on the end surface of the metal base body; the diamond tool bit comprises a working layer and a transition layer, and is characterized in that a plurality of hard particles are embedded in the transition layer, and the hardness of the hard particles is greater than that of the transition layer.

Because the hardness of the transition layer is weaker than that of the working layer by , after the drill bit is used for a long time, the side surface of the transition layer is worn more by concrete, so that hard particles gradually protrude and are exposed out of the surface of the transition layer, the hard particles replace the surface of the transition layer and are directly contacted with the concrete, the concrete is ground by the hard particles and is difficult to contact with the surface of the transition layer or is rarely contacted with the surface of the transition layer, and thus, the excessive wear to the transition layer is reduced, the transition layer can keep better strength, and further, the cutter head is prevented from falling off.

, a gap is formed between adjacent diamond tool bits to form a water channel, and water guide grooves connected with the water channel are arranged on the side surfaces of two sides of the substrate at the positions corresponding to the water channels, the slag flows into the water channel between the adjacent diamond tool bits along the water guide grooves on the inner side surface of the metal substrate and flows out along the water guide grooves on the outer side surface of the metal substrate, and the diamond tool bits are cooled well while slag is discharged, so that the diamond tool bits are prevented from being overheated to influence normal drilling.

Specifically, the water tank may be formed in the following two ways:

1. each diamond tip is independent, and the gaps are formed between the adjacent diamond tips to form the water tank, so that the advantage is that the cooling and deslagging effects are better because the water tank is deeper.

2. The working layers of all the diamond tool bits are independent, the transition layers of all the diamond tool bits are connected into bodies to form an annular structure, and the water grooves are formed between the working layers of the adjacent tool bits.

step by step, the top surface of working layer is equipped with a plurality of arc slot, the centre of a circle in arc slot and the position of the centre of a circle of base member send, through setting up the arc slot, can form a plurality of cutting edges on tool bits to reduce the thickness of cutting edge, improve the sharpness of tool bit, still conveniently arrange sediment and the cooling to the tool bit simultaneously.

, in order to increase the bonding area between the transition layer and the metal substrate and further improve the bonding strength of the transition layer and the metal substrate, the end face of the metal substrate is composed of an inner arc plane, an arc convex part in the middle and an outer arc plane, the number of the arc convex parts is equal to the number of the diamond tool bits, the bottom surface of the transition layer is provided with arc concave parts corresponding to the arc convex parts so as to respectively correspond to the inner arc plane and the outer arc plane, the arc concave parts of the transition layer are butted with the arc convex parts of the metal substrate, and the transition layer is fixedly connected with the metal substrate in a powder metallurgy sintering mode.

, the surface of the arc-shaped convex part and the arc-shaped concave part is provided with patterns to increase the surface area, thereby improving the bonding strength of the base body and the transition layer.

, the arc convex part and the arc concave part are triangular in cross section for convenient processing and butt joint.

, the outside surface of the cutter head protrudes outwards from the outside surface of the metal base body, so that a clearance is formed at the joint of the metal base body and the cutter head, and slag and water discharge in the working process is facilitated.

The coring bit of the invention not only reduces the abrasion to the transition layer in the working process, thereby prolonging the service life of the whole body, but also improves the sharpness of the bit, and leads the cooling and slag discharge of the bit to be more convenient, thereby having good practicability and commercial value.

Drawings

Fig. 1 is a side view of the core bit of example 1.

FIG. 2 is a sectional view of the end face of the metal substrate and a diamond tip in example 1.

Fig. 3 is a plan view of the end face of the metal base body of example 1.

Fig. 4 is a side view of the core bit of example 2.

The figures are numbered: 1. a substrate; 11. an inner arc plane; 12. an arc-shaped convex part; 13. an outer arcuate plane; 2. a diamond tool bit; 21. a working layer; 22. a transition layer; 23. hard particles; 24. an arc-shaped concave part; 25. a connection plane; 26. an arc-shaped groove; 3. a water tank; 4. a water guiding ditch.

Detailed Description

The following describes an embodiment of the present invention, such as the shape, structure, mutual position and connection relationship of the components, and the action and operation principle of the components, in further detail with reference to the accompanying drawings.