Drill bit

Abstract

The utility model belongs to the technical field of drill bits, and particularly relates to a drill bit. The drill bit comprises two water outlet holes formed in the front end face of the drill bit; 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 drill shoulder. According to the drill bit, the drainage groove is formed in the drill point, cooling liquid sprayed out of the water outlet hole of the drill point can be drained to the drill shoulder of the drill bit, so that the flow of the cooling liquid at the drill shoulder is increased, and a better cooling effect is achieved. The cutting heat of the drill shoulder can be effectively reduced, and rapid abrasion of the drill shoulder under high-temperature machining is delayed.

Description

Technical Field

[0001] The utility model belongs to the technical field of drill bits, and in particular relates to a drill bit. Background Art

[0002] In deep hole machining or hole machining of materials with poor thermal conductivity (such as stainless steel, titanium alloy and nickel-based alloy), the method of spraying coolant on the drill bit externally cannot promptly remove the heat generated during the cutting process of the drill bit, which causes the drill bit to be continuously in a high-temperature machining state, and the life of the drill bit will be greatly reduced. In order to solve this problem, drill bit materials with spiral water outlet holes 1 or linear water outlet holes 1 have been developed. In this way, when the drill bit is machining, the machine tool can transport the coolant from the water hole at the tail of the drill bit to the drill tip through the spindle, and then spray it out from the drill tip. Figure 1 As shown; the diameter of the spiral water hole 1 is about 0.1*D, and the center of the water hole 1 is located on a circle 0.5*D outside the tool axis, where D is the diameter of the drill bit. Figure 2 This not only cools the drill tip in time, but also flushes the chips out of the hole more smoothly, enhancing chip removal.

[0003] However, the applicant found that although the above internal cooling technology has largely solved the problem of rapid wear of the drill bit or even complete inability to process, in the processing of deep holes with an aspect ratio (aspect ratio = hole depth / hole diameter) exceeding 30 and in the processing of holes of materials with poor thermal conductivity, the two shoulders on the outermost periphery of the drill bit have the highest linear speed during the drilling process (shoulder structure such as Figure 3 As shown in the figure, it is the intersection of the main cutting edge and the secondary cutting edge), and the heat generated is also greater. The location of the drill shoulder 3 is far from the location of the cooling hole, and the drill shoulder 3 is close to the surface of the workpiece during operation. The space around it is very small, resulting in a small amount of coolant sprayed from the water outlet 1 reaching the two shoulders. Figure 4 As shown, its wear rate will still be much faster. Utility Model Content

[0004] The utility model aims to provide a drill bit to solve the technical problem that two shoulders of the existing drill bit wear too quickly when processing deep holes with an aspect ratio of more than 30 and when processing holes of materials with poor thermal conductivity.

[0005] The present application provides a drill bit. The drill bit comprises:

[0006] Two water outlet holes are provided on the front face of the drill bit; and

[0007] Two drainage grooves, the inner ends of the drainage grooves are connected to the water outlet holes, and the outer ends extend to one side of the drill shoulder.

[0008] In one embodiment of the present application, the diameter of the drill bit is D;

[0009] The depth of the drainage groove is 0.01D to 0.02D.

[0010] In one embodiment of the present application, the width of the drainage groove is 0.05D to 0.1D.

[0011] In one embodiment of the present application, the distance from the outer end of the drainage groove to the drill shoulder is 0.04D to 0.1D.

[0012] In one embodiment of the present application, a water inlet hole is provided at the rear end of the drill bit;

[0013] A flow channel connecting the water inlet and the corresponding water outlet is provided inside the drill bit.

[0014] The beneficial effect of this invention is that the drill bit of this invention is provided with a drainage groove at the drill tip, which can guide the coolant sprayed from the water outlet hole of the drill tip to the drill shoulder of the drill bit, thereby increasing the flow 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.

[0015] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a side view of a drill bit in the prior art;

[0019] Figure 2 This is a schematic diagram of the water outlet size of a drill bit in the prior art;

[0020] Figure 3 It is a schematic diagram of the drill shoulder of a drill bit in the prior art;

[0021] Figure 4 It is a working schematic diagram of a drill bit in the prior art;

[0022] Figure 5 It is a schematic diagram of the front end surface of the drill bit of the present invention;

[0023] Figure 6 It is a side view of the front end of the drill bit of the present invention;

[0024] Figure 7 It is a side view of the drill bit of the present invention.

[0025] In the picture:

[0026] Water outlet hole 1, drainage groove 2, drill shoulder 3, water inlet hole 4, flow channel 5. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0028] This application provides a drill bit, which is described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the description of each embodiment has its own emphasis. For details not described in one embodiment, please refer to the relevant descriptions of other embodiments.

[0029] The applicant found in the research that although the existing drill bit internal cooling technology has largely solved the problem of rapid wear of the drill bit or even complete inability to process, in the processing of deep holes with an aspect ratio (aspect ratio = hole depth / hole diameter) exceeding 30 and in the processing of holes of materials with poor thermal conductivity, the two shoulders on the outermost periphery of the drill bit have the highest linear speed during the drilling process (shoulder structure such as Figure 3 As shown in the figure, it is the intersection of the main cutting edge and the secondary cutting edge), and the heat generated is also greater. The location of the drill shoulder 3 is far from the location of the cooling hole, and the drill shoulder 3 is close to the surface of the workpiece during operation. The space around it is very small, resulting in a small amount of coolant sprayed from the water outlet 1 reaching the two shoulders. Figure 4 As shown, its wear rate will still be much faster.

[0030] Based on this, in one embodiment of the present application, see Figure 5 and Figure 6 , provides a drill bit, including: two water outlet holes 1, arranged on the front end surface of the drill bit; and two drainage grooves 2, the inner ends of the drainage grooves 2 are connected to the water outlet holes 1, and the outer ends extend to one side of the drill shoulder 3.

[0031] In this embodiment, the coolant can be guided to the drill shoulder 3 through the drainage groove 2 , thereby increasing the cooling and lubrication of the drill shoulder 3 and further improving the wear problem of the drill shoulder 3 .

[0032] In some embodiments, a drainage groove 2 may be ground at each of the two water outlet holes 1 of the drill tip using a diamond grinding wheel.

[0033] In this embodiment, the diameter of the drill bit is D; preferably, the depth H of the drainage groove 2 can be 0.01D to 0.02D.

[0034] Preferably, the width W of the drainage groove 2 may be 0.05D to 0.1D.

[0035] Preferably, the distance L from the outer end of the drainage groove 2 to the drill shoulder 3 is 0.04D to 0.1D.

[0036] In this embodiment, if the width and depth of the drainage groove 2 are lower than the recommended values ​​and the distance between the drainage groove and the shoulder is higher than the recommended value, the cooling effect will be weakened; if the width and depth of the drainage groove are higher than the recommended values ​​and the distance between the drainage groove and the shoulder is lower than the recommended value, although the cooling effect will be enhanced, it will cause excessive damage to the strength of the drill tip and easily cause chipping during processing.

[0037] See also Figure 7 A water inlet hole 4 is provided at the rear end of the drill bit; a flow channel 5 connecting the water inlet hole 4 and the corresponding water outlet hole 1 is provided inside the drill bit.

[0038] In summary, the drill bit of this invention incorporates a drainage groove with a specific width, depth, and distance from the drill shoulder. This groove directs coolant sprayed from the drill tip to the drill shoulder, increasing the coolant flow rate at the drill shoulder and achieving a better cooling effect. This approach effectively reduces cutting heat at the drill shoulder and slows down rapid wear of the drill shoulder during high-temperature machining.

[0039] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0040] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection.

[0041] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A drill bit, characterized in that: include: Two water outlet holes (1) are provided on the front end surface of the drill bit; as well as Two drainage grooves (2), wherein the inner ends of the drainage grooves (2) are connected to the water outlet hole (1), and the outer ends extend to one side of the drill shoulder (3).

2. The drill bit according to claim 1, characterized in that The diameter of the drill bit is D; The depth of the drainage groove (2) is 0.01D to 0.02D.

3. The drill bit according to claim 2, characterized in that The width of the drainage groove (2) is 0.05D to 0.1D.

4. The drill bit according to claim 2, characterized in that The distance from the outer end of the drainage groove (2) to the drill shoulder (3) is 0.04D to 0.1D.

5. The drill bit according to claim 1, characterized in that The rear end of the drill bit is provided with a water inlet hole (4); A flow channel (5) connecting the water inlet hole (4) and the corresponding water outlet hole (1) is provided inside the drill bit.

Images