CN223277231U - drill - Google Patents

Abstract

The present invention belongs to the technical field of drill bits, and specifically relates to a drill bit. The drill bit comprises: two water outlets, disposed on the front end face of the drill bit; and two drainage grooves, the inner ends of the drainage grooves being connected to the water outlets, and the outer ends of the drainage grooves extending to one side of the drill shoulder. The drill bit of the present invention is provided with drainage grooves at the drill tip, which can divert coolant sprayed from the water outlets at the drill tip to the drill shoulder of the drill bit, thereby increasing the flow rate of coolant at the drill shoulder and achieving a better cooling effect. This method can effectively reduce the cutting heat of the drill shoulder and delay the rapid wear of the drill shoulder under high-temperature processing.

Description

Drill bit

Technical Field

The utility model belongs to the technical field of drill bits, and particularly relates to a drill bit.

Background

In deep hole processing or hole processing of materials with poor thermal conductivity (such as stainless steel, titanium alloy and nickel-based alloy), the cooling liquid is sprayed to the drill bit from the outside, so that heat generated in the cutting process of the drill bit cannot be timely taken away, and further the drill bit is continuously in a high-temperature processing state, and the service life of the drill bit is greatly attenuated. In order to solve the problems, drill bit materials with spiral water outlet holes 1 or straight water outlet holes 1 are developed, so that when the drill bit is processed, a machine tool can convey cooling liquid from the tail water outlet holes of the drill bit to a drill point through a main shaft and then jet the cooling liquid from the drill point, as shown in fig. 1, the diameter of the spiral water outlet holes 1 is about 0.1 x D, the circle center position of the water outlet holes 1 is located on a circle with 0.5 x D of the outer periphery of a tool axis, and D is the diameter of the drill bit, as shown in fig. 2. Therefore, not only can the drill point be cooled in time, but also the cuttings can be punched out of the hole more smoothly, and the chip removal effect is enhanced.

However, the applicant found that the above-mentioned internal cooling technique, while solving the problem of too fast and even totally impossible to machine the drill bit to a large extent, generates more heat in deep hole machining in which the aspect ratio (aspect ratio=hole depth/bore diameter) exceeds 30 and in hole machining of materials with poor thermal conductivity, because the two shoulders of the outermost periphery of the drill bit have the highest linear velocity during drilling (the shoulder structure is the position where the main cutting edge intersects with the sub-cutting edge as shown in fig. 3). The position of the drilling shoulder 3 is far away from the position of the cooling hole, the drilling shoulder 3 is close to the surface of the workpiece when in operation, the surrounding space is small, so that the flow rate of the cooling liquid sprayed from the water outlet hole 1 to the two shoulders is small, as shown in fig. 4, and the abrasion speed is still greatly increased.

Disclosure of utility model

The utility model aims to provide a drill bit, which solves the technical problem that two shoulders of the drill bit are worn too fast in deep hole machining with the length-diameter ratio exceeding 30 and hole machining of materials with poor heat conductivity.

The application provides a drill bit. The drill bit comprises:

two water outlet holes arranged on the front end face of the drill bit, and

The inner ends of the drainage grooves are connected with the water outlet holes, and the outer ends of the drainage grooves extend to one side of the drilling shoulder.

In one embodiment of the application, the diameter of the drill bit is D;

the depth of the drainage groove is 0.01D-0.02D.

In an embodiment of the application, a width of the drainage groove is 0.05d to 0.1d.

In an embodiment of the present application, a distance from an outer end of the drainage groove to the drilling shoulder is 0.04d to 0.1d.

In an embodiment of the application, a water inlet is formed at the rear end of the drill bit;

the drill bit is internally provided with a runner connected with the water inlet hole and the corresponding water outlet hole.

The drill bit has the beneficial effects that the diversion trench is arranged on the drill bit, so that the cooling liquid sprayed from the water outlet of the drill bit can be diverted to the drill shoulder of the drill bit, thereby increasing the flow of the cooling liquid at the drill shoulder and achieving better cooling effect. The method can effectively reduce the cutting heat of the drilling shoulder and delay the rapid abrasion of the drilling shoulder under high-temperature processing.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and drawings.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a side view of a prior art drill bit;

FIG. 2 is a schematic view of the water hole size of a prior art drill bit;

FIG. 3 is a schematic view of a shoulder of a prior art drill bit;

FIG. 4 is a schematic diagram of the operation of a prior art drill bit;

FIG. 5 is a schematic view of the front face of the drill bit of the present utility model;

FIG. 6 is a front side view of the drill bit of the present utility model;

Fig. 7 is a side view of the drill bit of the present utility model.

In the figure:

the water inlet and outlet device comprises a water outlet hole 1, a drainage groove 2, a drilling shoulder 3, a water inlet hole 4 and a flow passage 5.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The present application provides a drill, which is described in detail below. It should be noted that the following description order of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the embodiments are focused on, and for the part that is not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

The applicant found in the study that, although the existing internal cooling technique of the drill bit solves the problem that the drill bit is worn out too fast or even cannot be processed at all to a great extent, in deep hole processing with an aspect ratio (length-diameter ratio=hole depth/aperture) exceeding 30 and in hole processing of materials with poor thermal conductivity, because the two shoulders of the outermost periphery of the drill bit have the highest linear velocity during drilling (the shoulder structures are the positions where the main cutting edge and the auxiliary cutting edge intersect as shown in fig. 3), more heat is generated. The position of the drilling shoulder 3 is far away from the position of the cooling hole, the drilling shoulder 3 is close to the surface of the workpiece when in operation, the surrounding space is small, so that the flow rate of the cooling liquid sprayed from the water outlet hole 1 to the two shoulders is small, as shown in fig. 4, and the abrasion speed is still greatly increased.

Based on this, in an embodiment of the present application, referring to fig. 5 and 6, there is provided a drill bit including two water outlet holes 1 provided on a front end surface of the drill bit, and two drainage grooves 2, inner ends of the drainage grooves 2 being connected to the water outlet holes 1, and outer ends extending to one side of a shoulder 3.

In this embodiment, the cooling liquid can be guided to reach the position of the drilling shoulder 3 through the drainage groove 2, so that cooling and lubrication of the drilling shoulder 3 are increased, and the abrasion problem of the drilling shoulder 3 is further improved.

In some embodiments, a drainage groove 2 is formed in each of two water outlet holes 1 of the drill point by a diamond grinding wheel.

In this embodiment, the diameter of the drill bit is D, and preferably, the depth H of the drainage groove 2 may be 0.01D to 0.02D.

Preferably, the width W of the drainage groove 2 may be 0.05d to 0.1d.

Preferably, the distance L from the outer end of the drainage groove 2 to the drilling shoulder 3 is 0.04d to 0.1d.

In this embodiment, if the width and depth of the drainage groove 2 are lower than the recommended value and the distance of the drainage groove from the shoulder is higher than the recommended value, the cooling effect is weakened, and if the width and depth of the drainage groove are higher than the recommended value and the distance of the drainage groove from the shoulder is lower than the recommended value, the cooling effect is enhanced, but the strength of the drill tip is damaged too much, and chipping is easily caused during processing.

Referring to fig. 7, the rear end of the drill bit is provided with a water inlet 4, and the interior of the drill bit is provided with a flow passage 5 connected with the water inlet 4 and the corresponding water outlet 1.

In summary, the drill bit of the present utility model grinds the drainage groove, and prescribes the width, depth and distance from the drill shoulder of the drainage groove, so as to drain the cooling liquid sprayed from the drill point to the drill shoulder of the drill bit, thereby increasing the flow of the cooling liquid at the drill shoulder and achieving better cooling effect. The method can effectively reduce the cutting heat of the drilling shoulder and delay the rapid abrasion of the drilling shoulder under high-temperature processing.

The components (components not illustrating the specific structure) selected in the present application are common standard components or components known to those skilled in the art, and the structures and principles thereof are known to those skilled in the art through technical manuals or through routine experimental methods.

In describing embodiments of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally coupled.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims (5)

1. A drill bit, comprising:

Two water outlet holes (1) arranged on the front end face of the drill bit, and

The two drainage grooves (2), the inner ends of the drainage grooves (2) are connected with the water outlet holes (1), and the outer ends of the drainage grooves extend to one side of the drilling shoulder (3).

2. The drill bit of claim 1, wherein the drill bit,

The diameter of the drill bit is D;

The depth of the drainage groove (2) is 0.01D-0.02D.

3. The drill bit of claim 2, wherein the drill bit is configured to,

The width of the drainage groove (2) is 0.05D-0.1D.

4. The drill bit of claim 2, wherein the drill bit is configured to,

The distance from the outer end of the drainage groove (2) to the drilling shoulder (3) is 0.04D-0.1D.

5. The drill bit of claim 1, wherein the drill bit,

The rear end of the drill bit is provided with a water inlet (4);

The inside of the drill bit is provided with a runner (5) connected with the water inlet hole (4) and the corresponding water outlet hole (1).