Micro-diameter chamfer tungsten steel fixed-point drill

Abstract

The utility model relates to a micro-diameter chamfer tungsten steel fixed-point drill which comprises a main drill bit, a first cavity is formed in the middle of the lower end of the main drill bit, a fixed-point drill bit body is arranged in the first cavity, a protruding block is arranged at the upper end of the fixed-point drill bit body, a push rod is connected to the upper end of the protruding block, and a micro air cylinder is connected to the upper portion of the push rod. A first channel is formed in the center of the interior of the push rod. By arranging the push rod and the fixed-point drill bit, when a positioning hole needs to be machined, the micro air cylinder on the machine tool drill bit machine base extends out, and the push rod extends out the fixed-point drill bit to conduct fixed-point drilling; when a chamfer needs to be machined, the fixed-point drill bit is contained in the first cavity through the push rod, so that the chamfering blade plays a role, the utilization rate of the drill bit can be increased, time is saved, and the machining speed is increased; by arranging the first cooling hole and the second cooling hole, cooling liquid can be directly conveyed to the centering edge and the chamfering edge, the service life of the drill bit is prolonged, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of fixed-point drilling technology, and in particular to a micro-diameter chamfered tungsten carbide fixed-point drill. Background Technology

[0002] Drill bits are cutting tools used to drill through holes or blind holes in solid materials and to enlarge existing holes. They are commonly used tools in machining. Commonly used drill bits include twist drills, flat drills, centering drills, deep hole drills, and chamfering drills. In the machining process, different drill bits need to be changed multiple times to complete processes such as drilling positioning holes and chamfering. Frequent changes will greatly affect production efficiency. Therefore, we designed a micro-diameter chamfering tungsten carbide positioning drill.

[0003] Chinese utility model patent CN202120726489.6 discloses an automatic centering chamfering device, which includes a chamfering drill bit, an inner mandrel, and a housing. The chamfering drill bit is connected to the inner mandrel. One end of the housing has a first hole, and the other end has a second hole, which communicate with each other. The first hole is a mounting hole, and the inner mandrel is connected to the mounting hole. There is a swing gap between the inner mandrel and the mounting hole. A limiting hole and a limiting pin are also provided between the inner mandrel and the housing. The limiting pin is disposed in the limiting hole. A top pin and a spring are provided in the second hole, and a first set screw is also provided in the second hole. The top pin presses against the inner mandrel. The spring is located between the first set screw and the top pin; when the chamfering drill is used to chamfer the hole to be machined, if the centers of the various workpieces to be machined are not on the same center line, the chamfering drill can automatically adjust its position and swing according to the hole to be machined, so that it can automatically adapt to the hole to be machined, making the chamfer evenly divided and burr-free after the machining is completed. However, this utility model has the following problems: First, it does not have the function of simultaneously machining positioning holes and chamfering. Frequent drill bit replacement will greatly affect production efficiency and the drill bit utilization rate is low. Second, it does not have the function of transporting coolant. During the high-speed grinding process of the drill bit, the temperature is too high, which affects the machining effect. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of the existing technology by setting up a push rod and a fixed-point drill bit, a shoulder and a protrusion, and a No. 1 cooling hole and a No. 2 cooling hole. This solves the technical problem that in the current machine tool processing, it is necessary to change different drill bits multiple times to complete processes such as drilling positioning holes and chamfering. Frequent changes will greatly affect production efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A micro-diameter chamfered tungsten carbide point drill includes a main drill bit, a cavity at the lower center of the main drill bit, a point drill bit inside the cavity, a protrusion at the upper end of the point drill bit, a push rod connected to the upper end of the protrusion, a micro cylinder connected above the push rod, and a channel at the center of the push rod.

[0007] As a preferred embodiment, the lower end of the fixed-point drill bit is provided with a drill tip, a centering edge is provided on the upper side of the drill tip, a centering chip removal groove is provided on the upper side of the centering edge, and a cooling hole is provided between the centering edges.

[0008] As a preferred embodiment, the lower edge of the main drill bit is provided with a chamfered edge, the upper side of the chamfered edge is provided with a chamfered chip removal groove, and the inner side of the chamfered edge is provided with a second cooling hole.

[0009] As a preferred embodiment, the upper end of the first cavity is provided with a shoulder, the protrusion is located above the shoulder, the upper end of the main drill bit is provided with a second cavity, and the lower end of the second cavity is provided with a third cavity.

[0010] As a preferred embodiment, the second cavity is provided with a sealing ring, and the inner surface of the sealing ring is fitted with a push rod.

[0011] As a preferred embodiment, the center of the fixed-point drill bit is provided with a Y-shaped channel, the lower end of the left arm of the Y-shaped channel is connected to an L-shaped channel, the lower end of the right arm of the Y-shaped channel is connected to a first cooling hole, and the lower end of the L-shaped channel is connected to a second cooling hole.

[0012] The beneficial effects of this utility model are:

[0013] (1) In this utility model, by setting a push rod and a fixed-point drill bit, when it is necessary to process a positioning hole, the miniature cylinder on the machine tool drill bit base extends, so that the push rod extends the fixed-point drill bit to perform fixed-point drilling; when it is necessary to process a chamfer, the push rod retracts the fixed-point drill bit into the first cavity, so that the chamfering edge can play a role. This can increase the utilization rate of the drill bit, save time, and increase the processing speed.

[0014] (2) In this utility model, by setting the shoulder and the protrusion, the extension position of the fixed point drill bit is limited, so as to prevent the fixed point drill bit from falling out of the first cavity and losing its function.

[0015] (3) By setting up cooling holes No. 1 and No. 2 in this utility model, the coolant can be directly transported to the centering edge and chamfering edge, which can extend the service life of the drill bit and improve the working efficiency.

[0016] In summary, this utility model has the advantages of simple structure, direct coolant delivery to the cutting head, and high utilization rate, and is especially suitable for the field of fixed-point drilling technology. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a micro-diameter chamfered tungsten carbide point drill.

[0019] Figure 2 This is a cross-sectional diagram of the main drill bit section.

[0020] Figure 3 This is a cross-sectional diagram of the push rod section and the fixed-point drill bit section. Detailed Implementation

[0021] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0022] Example 1

[0023] like Figures 1 to 3 As shown, this utility model provides a micro-diameter chamfered tungsten steel point drill, including a main drill bit 1. The lower center of the main drill bit 1 is provided with a cavity 11 for receiving a point drill bit 2. The point drill bit 2 is provided inside the cavity 11. The upper end of the point drill bit 2 is provided with a protrusion 21, which works in conjunction with a shoulder 32 to limit the extension length of the point drill bit 2. The upper end of the protrusion 21 is connected to a push rod 3. A micro cylinder is connected above the push rod 3 and is located on the machine tool drill bit base. When the micro cylinder is working, the push rod 3 is pushed downward to perform point drilling. The center of the push rod 3 is provided with a channel 31. The inside of the channel 31 is provided with a coolant pipe. The coolant at the machine tool drill bit base enters the coolant pipe of the Y-shaped channel 25 through the coolant pipe in the channel 31.

[0024] Furthermore, such as Figure 1 As shown, the lower middle part of the fixed-point drill bit 2 is provided with a drill tip 22 for positioning during drilling and reducing grinding deviation. The upper side of the drill tip 22 is provided with a centering blade 23 for high-speed rotation for positioning drilling. The upper side of the centering blade 23 is provided with a centering chip removal groove 24 to facilitate the discharge of chips during processing. A cooling hole 26 is provided between the centering blades 23, from which coolant flows out to cool the high-speed rotating centering blades 23.

[0025] Furthermore, a chamfering edge 4 is provided at the lower edge of the main drill bit 1. When the fixed-point drill bit 2 retracts into the first cavity 11, the chamfering edge 4 performs the chamfering function. A chamfering chip removal groove 41 is provided on the upper side of the chamfering edge 4 to facilitate the removal of chips during chamfering. A second cooling hole 42 is provided on the inner side of the chamfering edge 4, from which coolant flows out to cool down the high-speed rotating chamfering edge 4.

[0026] Furthermore, such as Figure 2 As shown, the upper end of the first cavity 11 is provided with a shoulder 32, and the protrusion 21 is located above the shoulder 32, which limits the extension position of the fixed-point drill bit 2 and prevents the fixed-point drill bit 2 from coming out of the first cavity 11 and losing its function. The upper end of the main drill bit 1 is provided with a second cavity 12, and the lower end of the second cavity 12 is provided with a third cavity 13.

[0027] Furthermore, a sealing ring 14 is provided inside the cavity 12 of the second cavity. The inner surface of the sealing ring 14 is fitted with a push rod 3 to increase the sealing between the main drill bit 1 and the push rod 3, ensuring that dust and debris can enter the interior of the main drill bit 1.

[0028] Furthermore, such as Figure 3 As shown, the center of the fixed-point drill bit 2 is provided with a Y-shaped channel 25. The lower end of the left arm of the Y-shaped channel 25 is connected to an L-shaped channel 15, and the lower end of the right arm of the Y-shaped channel 25 is connected to a first cooling hole 26. The lower end of the L-shaped channel 15 is connected to a second cooling hole 42. The coolant at the drill bit base enters the coolant pipe of the Y-shaped channel 25 through the coolant pipe in the first channel 31. Part of it flows out through the first cooling hole 26, and part of it flows out through the L-shaped channel 15 and the second cooling hole 42, so that the coolant can be directly transported to the centering edge 23 and the chamfering edge 4, extending the service life of the drill bit and improving working efficiency.

[0029] Working process: First, the miniature cylinder located on the machine tool drill bit base operates, causing the push rod 3 to be pushed downwards. The positioning drill bit 2 rotates at high speed under the action of the machine tool drill bit base, causing the centering edge 23 to perform positioning hole machining. At the same time, coolant flows out from the first cooling hole 26 and the second cooling hole 42 through the first channel 31, the Y-shaped channel 25, and the L-shaped channel 15 to cool the centering edge 23. Further, the miniature cylinder located on the machine tool drill bit base operates, causing the push rod 3 to move upwards, and the positioning drill bit 2 retracts into the first cavity 11. Further, the chamfering edge 4 rotates at high speed under the action of the machine tool drill bit base, causing the chamfering edge 4 to perform chamfering machining on the positioning hole, reducing burrs.

[0030] In the description of this utility model, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0031] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0032] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A micro-diameter chamfered tungsten carbide point drill, characterized in that: Includes a main drill bit (1), the lower end of the main drill bit (1) is provided with a cavity (11), a fixed-point drill bit (2) is provided in the cavity (11), the upper end of the fixed-point drill bit (2) is provided with a protrusion (21), the upper end of the protrusion (21) is connected to a push rod (3), the upper part of the push rod (3) is connected to a micro cylinder, and a channel (31) is provided in the center of the push rod (3).

2. The micro-diameter chamfered tungsten carbide point drill according to claim 1, characterized in that, The lower end of the fixed-point drill bit (2) is provided with a drill tip (22), and a centering blade (23) is provided on the upper side of the drill tip (22). A centering chip removal groove (24) is provided on the upper side of the centering blade (23), and a cooling hole (26) is provided between the centering blades (23).

3. The micro-diameter chamfered tungsten carbide point drill according to claim 1, characterized in that, The lower edge of the main drill bit (1) is provided with a chamfering edge (4), the upper side of the chamfering edge (4) is provided with a chamfered chip removal groove (41), and the inner side of the chamfering edge (4) is provided with a second cooling hole (42).

4. A micro-diameter chamfered tungsten carbide point drill according to claim 1, characterized in that, The upper end of the first cavity (11) is provided with a shoulder (32), the protrusion (21) is located above the shoulder (32), the upper end of the main drill bit (1) is provided with a second cavity (12), and the lower end of the second cavity (12) is provided with a third cavity (13).

5. A micro-diameter chamfered tungsten carbide point drill according to claim 4, characterized in that, The cavity (12) is provided with a sealing ring (14), and the inner surface of the sealing ring (14) is fitted with a push rod (3).

6. A micro-diameter chamfered tungsten carbide point drill according to claim 1, characterized in that, The fixed-point drill bit (2) has a Y-shaped channel (25) at its internal center. The lower end of the left arm of the Y-shaped channel (25) is connected to an L-shaped channel (15), and the lower end of the right arm of the Y-shaped channel (25) is connected to a first cooling hole (26). The lower end of the L-shaped channel (15) is connected to a second cooling hole (42).

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