A U-shaped drill bit for drilling

Abstract

This utility model relates to the field of U-drill bit processing technology, and more particularly to a U-drill bit for drilling, comprising a drill bit body, a pair of symmetrical drilling grooves on the bottom of the drill bit body, at least two cutting blades fixedly installed in the drilling grooves, the cutting blades being arranged at the rear side of the drilling groove in the direction of rotation. When the drill bit rotates and cuts, the cutting force causes the cutting blades to adhere tightly to the side wall of the drilling groove, forming a stable force support. A side baffle is inserted into the bottom of the drill bit body, the side baffle being located on the outside of the cutting blades, i.e., on the side of the cutting blades facing away from the support wall of the drilling groove. The side baffle applies a constraint force to multiple cutting blades simultaneously from its radially outer side, limiting the radial displacement of the cutting blades, enhancing the overall rigidity of the cutting blade assembly during the drilling process, and reducing vibration or loosening caused by fluctuations in cutting force. This U-drill bit, by setting a common side baffle, can complete the radial limiting of all cutting blades in one installation operation, simplifying the assembly process and improving the efficiency of cutting blade installation.

Description

Technical Field

[0001] This utility model relates to the field of U-drill bit processing technology, and in particular to a U-drill bit for drilling. Background Technology

[0002] U-shaped drills are high-efficiency hole-making tools widely used in modern machining. Their core function is to quickly drill holes with a certain precision and surface quality into solid materials. U-shaped drills typically employ an internal cooling structure, where cutting fluid flows directly from inside the drill rod to the cutting edge, effectively cooling and removing chips. This makes them excellent in deep hole machining and continuous high-volume production scenarios, particularly common in production lines for automotive engine blocks and energy equipment structural components. Therefore, the ease of tool changing and adjustment directly impacts the overall efficiency of the production line.

[0003] Existing multi-blade U-brush bits have significant shortcomings in this regard. Currently, common multi-blade U-brush bits typically use a method of securing each blade with a separate radial fastening screw. This design requires operators to tighten each screw individually when installing or replacing all blades, which accumulates significantly and prolongs tool change time during batch installations, failing to meet the demands of high-efficiency production cycles. Utility Model Content

[0004] The purpose of this invention is to provide a U-shaped drill bit for drilling, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An alloy shallow drill bit includes a drill bit body with a pair of symmetrical drilling grooves at the bottom of the drill bit body. At least two cutting blades are fixedly installed in the drilling grooves. A side baffle is inserted into the bottom of the drill bit body. The side baffle is located on the side of the cutting blades away from the wall of the drilling grooves and simultaneously applies radial pressure to several cutting blades to prevent the cutting blades from moving radially.

[0006] Preferably, the side baffle is configured as a zigzag shape corresponding to the arrangement of the cutting blades in the two side drilling grooves.

[0007] Preferably, the inner sidewall of the drill bit body is provided with a limiting groove corresponding to the top shape of the zigzag side baffle, and the side baffle passes through the slot opened at the bottom of the drill bit body and is inserted into the limiting groove.

[0008] Preferably, the drill bit body has a cutting groove machined on the side wall of the drilling groove, the cutting tool is installed in the cutting groove, the side wall of the cutting groove has a locating pin machined, and the cutting tool is sleeved on the locating pin through the mounting hole opened thereon.

[0009] Preferably, the cavity contour of the cutting groove corresponds to the shape of the cutting blade, and a protective hole is provided at the corner of the cutting groove.

[0010] Preferably, the middle section of the side baffle is machined with a square post that protrudes outward, and the square post is inserted into the limiting groove along with the side baffle.

[0011] Preferably, a long shaft screw is provided at the bottom of the side baffle, and the long shaft screw passes through the middle section of the side baffle and is threaded to the inner wall of the drill bit body.

[0012] Compared with the prior art, the advantages of this utility model are as follows: 1. By using a side baffle that can be inserted at the bottom of the drill bit body and a long shaft screw, multiple cutting tools can be fixed radially in a unified manner. This simplifies the operation of tightening multiple screws one by one in the traditional U-shaped drill bit to the step of tightening only one long shaft screw after inserting the side baffle, thereby significantly improving the efficiency of cutting tool assembly and replacement.

[0013] 2. By designing the side baffles into a zigzag shape that corresponds to the arrangement of the blades on both sides, it can simultaneously fit the outer surface of all the blades, increasing the effective contact area and providing more uniform radial support for the blades. This enhances the blades' ability to prevent radial displacement and further ensures the stability of the drilling process. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is an exploded view of the overall structure of this utility model; Figure 3 This is a partial structural diagram of the overall structure of this utility model; Figure 4 This is a partial structural cross-sectional view of the overall structure of this utility model.

[0015] The attached figures are labeled as follows: 1. Side baffle; 2. Blade; 3. Drill bit body; 4. Long shaft screw; 5. Tool groove; 6. Positioning pin; 7. Protective hole; 8. Limiting groove; 9. Square column. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] A U-shaped drill bit for drilling, such as Figures 1-4As shown, the drill bit body 3 has a pair of symmetrical drilling grooves at its bottom. At least two cutting blades 2 are fixedly installed in the drilling grooves. The cutting blades 2 are arranged at the rear side of the drilling groove in the direction of rotation. When the drill bit rotates and cuts, the cutting force causes the cutting blades 2 to stick tightly to the side wall of the drilling groove, forming a stable force support. A side baffle 1 is inserted into the bottom of the drill bit body 3. The side baffle 1 is located on the outside of the cutting blades 2, that is, on the side of the cutting blades 2 facing away from the support wall of the drilling groove. The side baffle 1 applies a constraint force to multiple cutting blades 2 from its radial outside at the same time, restricting the displacement of the cutting blades 2 in the radial direction, enhancing the overall rigidity of the cutting blade group 2 during the drilling process, and reducing vibration or loosening caused by the fluctuation of cutting force. Traditional U-bit drills typically require individual radial fasteners, such as multiple screws, for each insert 2. This U-bit drill, by setting a common side baffle 1, can complete the radial limiting of all inserts 2 in a single installation operation, simplifying the assembly process and improving the efficiency of insert 2 replacement or installation.

[0018] After installation, the installation height of the side baffle 1 is lower than the cutting edge height of the blade 2, ensuring that the side baffle 1 will not participate in the cutting work. The drilling function is entirely undertaken by the blade 2, ensuring smooth drilling and effective chip removal.

[0019] The side baffle 1 is configured as a zigzag shape corresponding to the arrangement position of the blades 2 in the drilling grooves on both sides, so that it can extend along the arrangement path of the blades 2 and maintain surface contact with the outer surfaces of multiple blades 2 at the same time. By increasing the contact area, the side baffle 1 provides more uniform and reliable constraint on the blades 2, thereby effectively improving the ability to prevent the blades 2 from moving radially. At the same time, this constraint method also further improves the efficiency of installation and fixing.

[0020] The inner wall of the drill bit body 3 is provided with a limiting groove 8 that corresponds to the top shape of the zigzag side baffle 1. During installation, the side baffle 1 is inserted upward from the groove at the bottom of the drill bit body 3, and its top is finally embedded in the limiting groove 8. This allows the limiting groove 8 to constrain the side baffle 1 from above, effectively suppressing the radial shaking of the side baffle 1 generated by the drill bit at high speed. By enhancing the stability of the side baffle 1 itself, it indirectly improves its radial support rigidity and constraint force on the cutting tool 2, thereby ensuring the smoothness of the drilling process and the quality of the machined hole.

[0021] The drill bit body 3 has a cutting groove 5 machined on the side wall of the drilling groove. The cutting tool 2 is installed in the cutting groove 5. A positioning pin 6 is machined on the side wall of the cutting groove 5. The cutting tool 2 is sleeved on the positioning pin 6 through the mounting hole opened on it. The positioning pin 6 prevents the cutting tool 2 from falling axially from the cutting groove 5. The axial limit of the positioning pin 6 cooperates with the radial limit of the side baffle 1 to quickly fix the cutting tool 2 under the drill bit body 3. This eliminates the step of individually tightening screws for each cutting tool 2, simplifies the assembly process, and improves the installation speed of the cutting tool 2.

[0022] The cavity contour of the cutting groove 5 corresponds to the shape of the cutting blade 2. The hole wall of the cutting groove 5 is used to initially limit the circumference of the cutting blade 2. A protective hole 7 is provided at the corner of the cutting groove 5. When the cutting blade 2 is installed in place with the help of the positioning pin 6, one corner of the cutting blade 2 will be embedded in the protective hole 7. During the cutting process, the cutting blade 2 will be subjected to impact load. According to the principle of elasticity, under the action of load, the stress at the sharp corner of the cutting blade 2 is much higher than that in the straight area. This will cause the cutting force to be superimposed locally, which will easily cause it to break. By opening the protective hole 7 here, the sharp corner is prevented from being squeezed hard against the cutting groove 5, which would cause the cutting blade 2 to break, thereby extending the service life of the cutting blade 2.

[0023] The middle section of the side baffle 1 has a square post 9 protruding outward. When the side baffle 1 is installed, the square post 9 is inserted into the limiting groove 8 on the inner side wall of the drill bit body 3 along with the side baffle 1. The cooperation between the square post 9 and the limiting groove 8 increases the contact area between the two and provides a non-circular mating surface, which enhances the resistance of the side baffle 1 to torsion. At the same time, this cooperation also plays a guiding and precise limiting role, so that the side baffle 1 can quickly and accurately reach the predetermined position during the insertion process, improving the positioning accuracy and connection rigidity of the assembly.

[0024] A long-shaft screw 4 is provided at the bottom of the side baffle 1. The long-shaft screw 4 passes through the middle section of the side baffle 1 and is threaded to the inner wall of the drill bit body 3. By tightening the long-shaft screw 4, the side baffle 1 is pressed and fixed to the bottom of the drill bit body 3, while ensuring that the square post 9 at its top is inserted into the limiting groove 8. This enhances the overall installation rigidity of the side baffle 1 and makes its radial compression effect on the cutting blade 2 more stable. During the assembly process, the operator only needs to place all the cutting blades 2 in the cutting groove 5 and put them on the positioning pin 6, then insert the side baffle 1, and finally tighten one long-shaft screw 4 to complete the fixing of all the cutting blades 2. Compared with the traditional method of tightening multiple screws one by one, this significantly reduces the operation steps and improves the assembly efficiency.

[0025] The working principle of the U-shaped drill bit for drilling provided by this utility model is as follows: During assembly, the cutting tool 2 is first placed into the cutting groove 5 at the bottom of the drill bit body 3. The contour of the cutting groove 5 matches the shape of the cutting tool 2, and it is circumferentially limited. At the same time, the mounting hole on the blade 2 is fitted onto the positioning pin 6 on the side wall of the tool groove 5, preventing the blade 2 from moving or falling off in the axial direction; To further prevent the blade 2 from rotating, one corner of the blade 2 is embedded into the protective hole 7 at the corner of the blade groove 5, avoiding hard compression between the sharp corner and the blade groove 5, thereby extending the service life of the blade 2.

[0026] After all the blades 2 are initially in place, insert the zigzag side baffle 1 from the bottom of the drill body 3 upwards; The top of the side baffle 1 and the square post 9 are embedded together in the limiting groove 8 on the inner side wall of the drill bit body 3, which constrains the side baffle 1 from the top and prevents it from shaking or radially shifting during operation. After insertion, the inner side of the side baffle 1 will simultaneously and tightly adhere to the side of all blades 2 away from the support wall of the blade groove 5, thereby applying a compressive force to all blades 2 in the radial direction and preventing the blades 2 from moving outward radially.

[0027] Finally, use a long-shaft screw 4 to pass through the bottom of the side baffle 1 and screw it into the threaded hole of the drill body 3. Tighten the screw to lock the entire side baffle 1 onto the drill body 3.

[0028] During operation, the drill body 3 rotates, and the cutting force pushes the cutting tool 2 to press against the support wall of the tool groove 5 and the side baffle 1, forming a stable force balance. Since the side baffle 1 is rigidly supported by the limiting groove 8 and the long shaft screw 4, it can stably constrain the cutting tool 2, ensuring the stability of the drilling process and the processing quality.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A U-shaped drill bit for drilling, comprising a drill bit body (3), wherein a pair of symmetrical drilling grooves are provided on the bottom of the drill bit body (3), and at least two cutting blades (2) are fixedly installed in the drilling grooves, characterized in that, A side baffle (1) is inserted into the bottom of the drill bit body (3). The side baffle (1) is located on the side of the blade (2) away from the drilling groove wall, and simultaneously applies radial pressure to several blades (2) to prevent the blades (2) from moving radially.

2. A U-shaped drill bit for drilling according to claim 1, characterized in that, The side baffle (1) is configured as a zigzag shape corresponding to the arrangement of the cutting blades (2) in the drilling grooves on both sides.

3. A U-shaped drill bit for drilling according to claim 2, characterized in that, The inner wall of the drill bit body (3) is provided with a limiting groove (8) corresponding to the top shape of the zigzag side baffle (1). The side baffle (1) passes through the slot opened at the bottom of the drill bit body (3) and is inserted into the limiting groove (8).

4. A U-shaped drill bit for drilling according to claim 1, characterized in that, The drill bit body (3) has a cutting groove (5) machined on the side wall of the drilling groove. The cutting tool (2) is installed in the cutting groove (5). A positioning pin (6) is machined on the side wall of the cutting groove (5). The cutting tool (2) is sleeved on the positioning pin (6) through the mounting hole opened on it.

5. A U-shaped drill bit for drilling according to claim 4, characterized in that, The cavity contour of the cutting groove (5) corresponds to the shape of the blade (2), and a protective hole (7) is provided at the corner of the cutting groove (5).

6. A U-shaped drill bit for drilling according to claim 2, characterized in that, The middle section of the side baffle (1) is machined with a square column (9), which is inserted into the limiting groove (8) along with the side baffle (1).

7. A U-shaped drill bit for drilling according to claim 6, characterized in that, A long shaft screw (4) is provided at the bottom of the side baffle (1). The long shaft screw (4) passes through the middle section of the side baffle (1) and is threaded to the inner wall of the drill bit body (3).

Images