Anti-deflection inner-cooling step drill with guide edges

Abstract

The utility model belongs to the technical field of machining tools, particularly relates to an anti-deflection inner-cooling step drill with guide edges, and aims to solve the problems that in the machining process of an existing device, when a drill body rotates at a high speed and cuts into a workpiece, an effective guide positioning mechanism is lacked, so that the drill body deflects in the machining process, and the machining quality is influenced. In order to solve the problems that the position precision of a stepped hole is difficult to meet the design requirement and the hole diameter size has a large error, the utility model provides the following scheme: the anti-deflection inner-cooling stepped drill with the guide edge comprises a drill handle, a drill body and a drill tip; the stepped hole drill has the advantages that the guide edges arranged on the drill body can play a good guiding role in the drilling process, deflection of the drill body is effectively limited, it is guaranteed that a machined stepped hole is high in position precision and stable in hole diameter size, friction between the guide edges and the hole wall is reduced through the transition fillets between the outer surfaces of the guide edges and the cutting edges, and the service life of the stepped hole is prolonged. And the processing stability is further improved.

Description

Technical Field

[0001] This utility model relates to a step drill, specifically a step drill with a guide ridge for anti-swaying internal cooling, belonging to the field of machining tool technology. Background Technology

[0002] In the field of machining, stepped holes are a common feature structure and are widely used in many industries such as aerospace, automobile manufacturing, and mold processing. As a special tool for machining stepped holes, the performance of stepped drills directly affects the machining quality and production efficiency.

[0003] In the prior art, such as the stepped drill disclosed in announcement number CN214815120U, a transition surface is provided between the step and the conical surface to form an arc transition. When the stepped drill is machining thin plates, when drilling through one step to the next step, the cutting width gradually increases from the starting point of the arc. This can alleviate the impact force and prevent the drill bit from getting stuck due to overcutting. The above-mentioned prior art has the following shortcomings: during the machining process, when the drill body rotates at high speed and cuts into the workpiece, there is a lack of an effective guiding and positioning mechanism, which causes the drill body to wobble during the machining process. This not only makes it difficult to achieve the design requirements for the positional accuracy of the stepped hole, but also causes a large error in the hole diameter. Utility Model Content

[0004] The purpose of this invention is to solve the problem that the above-mentioned device lacks an effective guiding and positioning mechanism when the drill body rotates at high speed and cuts into the workpiece during the processing, which causes the drill body to wobble during the processing. This not only makes it difficult to achieve the design requirements for the positional accuracy of the stepped hole, but also causes a large error in the hole diameter. Therefore, this invention provides an anti-wabble internal cooling stepped drill with a guide ridge.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a guide rib anti-sway internal cooling step drill, including a drill shank, a drill body and a drill tip;

[0006] The drill shank is fixedly connected to the drill body, the drill tip is fixed to the front end of the drill body, and a guide ridge is provided on the drill body along its axial direction. The guide ridges are evenly distributed along the circumference of the drill body, and a transition fillet is provided between the outer surface of the guide ridge and the cutting edge of the drill body.

[0007] As a further improvement of this utility model, the length of the guide ridge is greater than the step length of different diameter segments on the drill body, and the outer diameter of the guide ridge in different diameter segments of the drill body is equal to the outer diameter of the drill body cutting edge at the corresponding position.

[0008] As a further improvement of this utility model: chip removal grooves are naturally formed between adjacent cutting edges on the surface of the drill body, and the chip removal grooves have a spiral structure.

[0009] As a further improvement of this utility model, the outer peripheral surface of the drill shank is provided with anti-slip texture.

[0010] As a further improvement of this utility model: the drill body is provided with an internal cooling channel, the inlet of which is located on the drill shank and the outlet of which is located at the cutting edge of the drill tip.

[0011] As a further improvement of this utility model, multiple branch channels are opened near the cutting edge of the drill body, and all of the branch channels are connected to the internal cooling channel.

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

[0013] This utility model utilizes a combination of structures such as a drill shank, drill body, guide ridge, chip removal groove, anti-slip texture, and internal cooling channel (HE branch channel). The guide ridge on the drill body provides excellent guidance during drilling, effectively limiting the drill body's sway and ensuring high positional accuracy and stable diameter of the machined stepped hole. The transition radius between the outer surface of the guide ridge and the cutting edge reduces friction between the guide ridge and the hole wall, further improving machining stability.

[0014] The internal cooling channel design allows the coolant to directly reach the cutting area, quickly removing cutting heat, reducing the temperature of the tool and workpiece, reducing tool wear, increasing tool life, and improving the surface finish. The chip removal channel is connected to the outlet of the internal cooling channel, so the coolant can assist in chip removal while cooling, preventing chip blockage and ensuring smooth machining. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 In this utility model Figure 1 A schematic diagram of the bottom view structure;

[0017] Figure 3 In this utility model Figure 1 A schematic diagram of the top view structure;

[0018] Figure 4 In this utility model Figure 2 An enlarged schematic diagram of the structure at point A in the diagram;

[0019] In the diagram: 1. Drill shank; 2. Drill body; 3. Drill tip; 4. Guide ridge; 5. Chip removal groove; 6. Anti-slip texture; 7. Internal cooling channel; 8. Branch channel. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0021] like Figures 1 to 4 As shown, an anti-sway internal cooling step drill with a guide ridge includes a drill shank 1, a drill body 2, and a drill tip 3;

[0022] The drill shank 1 is fixedly connected to the drill body 2, the drill tip 3 is fixed to the front end of the drill body 2, the drill body 2 is provided with a guide rib 4 along its axial direction, the guide rib 4 is evenly distributed along the circumference of the drill body 2, and a transition fillet is provided between the outer surface of the guide rib 4 and the cutting edge of the drill body 2.

[0023] During the machining process of the stepped drill, the guide ridge 4 contacts the hole wall. The transition fillet can avoid direct friction between the sharp edge and the hole wall, reduce friction, reduce wear on the guide ridge 4 and the hole wall, extend tool life, and reduce machining costs. The fillet transition makes the contact between the guide ridge 4 and the hole wall smoother, reduces vibration caused by uneven friction during tool rotation and feed, makes the machining process more stable, and thus improves the machining accuracy and surface quality of the stepped hole.

[0024] Furthermore, the length of the guide rib 4 is greater than the step length of different diameter segments on the drill body 2, and the outer diameter of the guide rib 4 in different diameter segments of the drill body 2 is equal to the outer diameter of the cutting edge of the drill body 2 at the corresponding position.

[0025] The longer guide rib 4 can better guide the tool during drilling, reducing tool deviation and wobbling. Especially when machining stepped holes, it can ensure coaxiality between different diameter segments, making the machined stepped holes more accurate in size and more regular in shape. The outer diameter of the guide rib 4 is equal to the outer diameter of the cutting edge, which allows the guide rib 4 to fit tightly against the machined hole wall during drilling, providing stable support for the tool, dispersing cutting force, and avoiding vibration of the tool due to uneven force, thereby improving the stability of the machining process and helping to improve machining efficiency and quality.

[0026] Furthermore, chip removal grooves 5 are naturally formed between adjacent cutting edges on the surface of the drill body 2, and the chip removal grooves 5 have a spiral structure.

[0027] The spiral chip removal groove 5 utilizes the centrifugal force of the rotating tool and the gravity of the chips themselves to gradually push the chips out of the hole along the spiral groove, preventing the chips from accumulating inside the hole and ensuring smooth machining. Example 2

[0028] Improvements based on Example 1:

[0029] Furthermore, the outer peripheral surface of the drill shank 1 is provided with anti-slip texture 6.

[0030] The anti-slip texture 6 can increase the friction between the drill shank 1 and the clamping device, preventing the drill shank 1 from slipping when rotating at high speed or bearing large cutting forces, thus ensuring the accuracy and stability of machining.

[0031] Furthermore, the drill body 2 is provided with an internal cooling channel 7, the inlet of which is located on the drill shank 1, and the outlet of which is located at the cutting edge of the drill tip 3.

[0032] The internal cooling channel 7 delivers coolant directly to the cutting edge of the drill tip 3, which can quickly remove the heat generated during the cutting process, effectively reduce the cutting temperature, prevent the tool from wearing or annealing due to overheating, and extend the tool's service life.

[0033] Furthermore, multiple branch channels 8 are opened near the cutting edge of the drill body 2, and all of the multiple branch channels 8 are connected to the internal cooling channel 7.

[0034] Branch channels 8 allow the coolant to be closer to the cutting area, cooling the cutting edge from multiple directions. Compared to a single cooling channel, it can more effectively remove cutting heat, reduce cutting temperature, prevent tool wear or damage due to overheating, and extend tool life. Multiple branch channels 8 allow the coolant to impact the chips at different angles, increasing the pushing and scouring force on the chips, making it easier for the chips to be discharged from the cutting area, avoiding chip accumulation in the hole or entanglement on the tool, which helps to improve the surface quality and machining efficiency.

[0035] Working principle: When using, take out the anti-slip internal cooling step drill with guide ridge, carefully check the weld between the drill shank 1 and the drill body 2, check whether there is any blockage in the chip removal groove 5, and whether the internal cooling channel 7 and the branch channel 8 are unobstructed. Then, install the drill shank 1 into the clamping device of the machine tool. The anti-slip texture 6 on the outer periphery of the drill shank 1 increases the friction with the clamping device to prevent the drill shank 1 from slipping during the processing.

[0036] Start the machine tool, and the anti-sway internal cooling step drill with guide rib starts to rotate and feeds towards the cylinder workpiece. During the drilling process, the guide rib 4 contacts the machined hole wall. Since the length of the guide rib 4 is greater than the step length of different diameter sections on the drill body 2, and the outer diameter is equal to the outer diameter of the cutting edge of the drill body 2 at the corresponding position, it can effectively limit the sway of the drill body 2 and ensure the positional accuracy and hole diameter of the step hole.

[0037] The coolant enters through the inlet of the internal cooling channel 7 on the drill shank 1, flows to the drill tip 3 through the main internal cooling channel 7, and reaches the cutting edge of the drill tip 3 through the branch channel 8. The coolant can not only quickly remove cutting heat, reduce the temperature of the tool and the workpiece, and reduce tool wear, but also assist in chip removal. Under the flushing of the coolant, the chips spiral upward along the chip removal groove 5 and are discharged, effectively preventing chip blockage and ensuring the continuity of machining.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A type of anti-sway internal cooling step drill with guide ridge, characterized in that: It includes a drill shank (1), a drill body (2), and a drill tip (3); The drill shank (1) is fixedly connected to the drill body (2), the drill tip (3) is fixed to the front end of the drill body (2), the drill body (2) is provided with a guide rib (4) along its axial direction, the guide rib (4) is evenly distributed along the circumferential direction of the drill body (2), and the outer surface of the guide rib (4) is provided with a transition fillet between the cutting edge of the drill body (2).

2. The anti-sway internal cooling step drill with guide ridge according to claim 1, characterized in that: The length of the guide ridge (4) is greater than the step length of different diameter segments on the drill body (2), and the outer diameter of the guide ridge (4) on different diameter segments of the drill body (2) is equal to the outer diameter of the cutting edge of the drill body (2) at the corresponding position.

3. The anti-sway internal cooling step drill with guide ridge according to claim 1, characterized in that: Chip removal grooves (5) are naturally formed between adjacent cutting edges on the surface of the drill body (2), and the chip removal grooves (5) have a spiral structure.

4. The anti-sway internal cooling step drill with guide ridge according to claim 1, characterized in that: The outer peripheral surface of the drill shank (1) is provided with anti-slip texture (6).

5. The anti-sway internal cooling step drill with guide ridge according to claim 1, characterized in that: The drill body (2) is provided with an internal cooling channel (7). The inlet of the internal cooling channel (7) is located on the drill shank (1), and the outlet of the internal cooling channel (7) is located at the cutting edge of the drill tip (3).

6. The anti-sway internal cooling step drill with guide ridge according to claim 1, characterized in that: Multiple branch channels (8) are opened near the cutting edge of the drill body (2), and all of the multiple branch channels (8) are connected to the internal cooling channel (7).

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