Deep hole drilling blind pattern locking drill-milling head

Abstract

The utility model relates to lock core milling head technical field especially is a kind of deep hole drill blind pattern locking drill milling head, including milling handle and milling head subassembly, the diameter of milling handle and milling head subassembly is identical, and the top end of milling handle and the bottom end of milling head subassembly are fixedly connected, milling handle is circular straight handle structure, the middle segment of milling handle is equipped with antiskid subassembly, milling head subassembly includes milling tip and milling groove, milling tip is circular arc structure, and multiple cutting edges are arranged thereon, milling tip and milling groove smoothly link, milling groove is distributed in the cylindrical surface of milling handle end portion in spiral type, and it is composed of multiple shallow grooves, the tip of milling groove is provided with side blade cutting edge, side blade cutting edge has normal rake angle, in the utility model, the setting of milling head subassembly reduces the demand to torque, can make overall adaptation handheld electric drill low torque working condition, avoid the situation that drill bit is stuck, speed drops suddenly or even stops, guarantee that drilling operation can continue to carry out, also can improve hole wall quality.

Description

Technical Field

[0001] This utility model relates to the field of lock core milling head technology, specifically a deep hole drilling blind pattern locking milling head. Background Technology

[0002] A lock cylinder milling head is a precision tool specifically designed for machining lock cylinders. The purpose of the lock cylinder milling head is to improve the accuracy and efficiency of lock cylinder machining. It can complete machining processes such as milling, drilling, and tapping of lock cylinders. This tool head integrates high-precision milling cutters and can perform fine machining on lock cylinders made of metal or other materials to form the complex key tracks and grooves inside the lock cylinder. In lock cylinder processing, existing technology usually uses twist drills for drilling operations. Twist drills are characterized by having only two main cutting edges, a drill tip angle of 144°, and a large groove depth, providing a large chip space. When working, they rely on these two main cutting edges that extend from the top corner to the side to achieve the cutting action, thereby drilling out the lock cylinder hole. The structure of twist drills has obvious drawbacks: since only two cutting edges participate in cutting, the cutting force is highly concentrated at the drill tip and cutting edge. The deep grooves result in a large cutting volume for each drill operation, requiring high torque to drive it. When using a handheld electric drill for core drilling, the torque of the handheld electric drill itself is relatively insufficient, which easily leads to the drill bit getting stuck, causing the drill bit speed to drop sharply or even stop, making it impossible to continue processing. Therefore, in order to address the above problems, a deep hole drilling blind groove locking drill and milling head is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a deep hole drilling blind thread locking milling head to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A deep hole drilling blind thread locking milling head includes a milling shank and a milling head assembly. The milling shank and the milling head assembly have the same diameter, and the top end of the milling shank and the bottom end of the milling head assembly are fixedly connected. The milling shank is a circular straight shank structure, and an anti-slip component is provided in the middle section of the milling shank. The milling head assembly includes a milling tip and a milling groove. The milling tip has an arc-shaped structure with multiple cutting edges. The milling tip and the milling groove are smoothly connected. The milling groove is spirally distributed on the cylindrical surface of the end of the milling shank and is composed of multiple shallow grooves. The tip of the milling groove is provided with a side cutting edge, and the side cutting edge has a forward angle.

[0005] As a further optimization of this utility model, the milling shank has multiple keyways on the outer side of the end away from the milling head assembly along the axial direction of the milling shank. The multiple keyways are arranged at equal intervals and are adapted to handheld electric drill chucks.

[0006] As a further optimization of this utility model, the anti-slip structure includes an annular anti-slip groove and an anti-slip ring pad, wherein the anti-slip groove is located on the outer side of the middle section of the milling shank.

[0007] As a further optimization of this utility model, the anti-slip ring pad is a ring structure, the height of the anti-slip ring pad is the same as that of the anti-slip groove, and the outer surface of the anti-slip ring pad is provided with anti-slip texture.

[0008] As a further optimization of this utility model, the thickness of the anti-slip ring pad is consistent with the opening depth of the anti-slip groove, and the anti-slip ring pad is fitted inside the anti-slip groove.

[0009] As a further optimization of this utility model, the anti-slip ring pad is provided with symmetrical mounting rings on its upper and lower sides, the end of the mounting ring away from the anti-slip ring pad is a protruding structure, the upper and lower ends of the anti-slip ring pad are provided with symmetrical mounting grooves, and the end of the mounting ring near the anti-slip ring pad is fixedly embedded in the mounting groove.

[0010] As a further optimization of this utility model, the inner top wall and inner bottom wall of the anti-slip groove are provided with limiting slots, and the limiting slots are adapted to the protruding structure of the mounting ring.

[0011] Compared with the prior art, the beneficial effects of this utility model are: In this invention, multiple cutting edges are provided in the milling head assembly, replacing the only two main cutting edges of the twist drill, thus dispersing the cutting force and preventing excessive concentration of cutting force in localized areas. The milling tip adopts an arc-shaped structure, changing the large angle design of the 144° drill tip of the twist drill, further optimizing the distribution of cutting force, reducing the force per unit area, and effectively preventing surface cracking of the lock core workpiece. The milling groove is spiral-shaped and composed of shallow grooves, which reduces the cutting amount and torque requirements compared to the deeper grooves of the twist drill. It is suitable for the low torque conditions of handheld electric drills, avoiding situations such as drill bit jamming, sudden drop in speed, or even stoppage, ensuring continuous drilling operations, and also improving the hole wall quality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the milling head assembly of this utility model; Figure 3 This is an exploded view of the anti-slip component of this utility model; Figure 4 This is a cross-sectional view of the anti-slip component of the milling shank of this utility model; Figure 5 This utility model Figure 3 Enlarged view of point A; Figure 6This utility model Figure 4 Enlarged view of point B; Figure 7 This is a schematic diagram of the anti-slip ring pad of this utility model; Figure 8 This is a cross-sectional view of the anti-slip ring pad of this utility model.

[0013] In the diagram: 1. Milling shank; 11. Keyway; 2. Milling head assembly; 21. Milling tip; 22. Milling groove; 23. Cutting edge; 3. Anti-slip assembly; 31. Anti-slip groove; 32. Anti-slip ring pad; 33. Anti-slip texture; 34. Mounting ring; 35. Mounting slot; 36. Limiting slot. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0015] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0016] Please see Figures 1-8 This utility model provides a technical solution: A deep hole drilling blind thread locking milling head includes a milling shank 1 and a milling head assembly 2. The milling shank 1 and the milling head assembly 2 have the same diameter, and the top end of the milling shank 1 and the bottom end of the milling head assembly 2 are fixedly connected. The milling shank 1 is a circular straight shank structure, and an anti-slip component 3 is provided in the middle section of the milling shank 1. The milling head assembly 2 includes a milling tip 21 and a milling groove 22. The milling tip 21 is an arc-shaped structure with multiple cutting edges 23. The milling tip 21 and the milling groove 22 are smoothly connected. The milling groove 22 is spirally distributed on the cylindrical surface at the end of the milling shank 1 and is composed of multiple shallow grooves. The tip of the milling groove 22 is provided with a side cutting edge with a normal forward angle.

[0017] It should be noted that: the milling shank 1, as the core of the connection between the milling head and the hand drill, is responsible for torque transmission and stable grip. It is made of carbide round bar and ground as a whole to ensure high strength and wear resistance. It is suitable for deep hole drilling and milling operations with blind thread locking structure. Its diameter is exactly the same as that of the milling head assembly 2. The two are fixedly connected by precision welding process to avoid stress concentration caused by sudden diameter change, and to ensure that the torque is evenly transmitted to the milling head assembly 2 during drilling to prevent local breakage. Furthermore, the milling tip 21 adopts an arc-shaped structure, with multiple cutting edges 23 (equally distributed to ensure uniform cutting force) ground on its surface. The cutting edges 23 are made of high-speed steel (welded to the carbide milling head assembly 2, resulting in high sharpness and wear resistance). The arc-shaped design expands the cutting force distribution distance from the "concentration at the apex" of traditional twist drills to "dispersion on the arc surface," reducing torque at the drill tip and making it suitable for low-torque scenarios with handheld electric drills. At the same time, multiple cutting edges 23 participate in cutting simultaneously, avoiding chipping of the cutting edge due to excessive force on a single edge and extending its service life. The milling grooves 22 are spirally distributed on the cylindrical surface at the end of the milling shank 1 (helix angle 15°-20°, ensuring smooth chip removal). They are composed of multiple shallow grooves (corresponding to the number of cutting edges 23, forming a "edge-groove" fit). The groove depth is only about 1mm (far shallower than the deep grooves of traditional twist drills, forming a "shallow groove to reduce cutting amount" design). The shallow groove structure can control the cutting depth of each drill, reduce the cutting force of the main cutting edge 23, and further reduce the overall torque requirement. This avoids the problem of "large cutting amount due to groove depth and insufficient torque of hand-held electric drill" in traditional twist drills from the root. The tip of the groove is equipped with a side cutting edge (smoothly connected with the cutting edge 23 of the milling tip 21 to form a continuous cutting surface). The side cutting edge has a normal forward angle of 5°-8° (this angle can reduce cutting resistance while ensuring cutting sharpness). During drilling, the side cutting edge can simultaneously polish the hole wall, avoiding the problem of rough hole wall requiring secondary processing in traditional twist drills, and adapting to the hole wall precision requirements of blind thread locking. In addition to its chip-collecting function, the shallow groove 24 features an inclined wall design (30° angled to the axis of the milling head assembly 2), which facilitates the discharge of metal chips generated during drilling (the lock cylinder is mostly made of brass or stainless steel, and the chips are in the form of fine particles) along the spiral groove. This avoids the problem of "chip accumulation and jamming in deep grooves" in traditional twist drills. Although the shallow groove has a small volume, the cutting amount is reduced (the single cutting amount is only 1 / 3 to 1 / 2 of that of traditional twist drills), and the chips can be discharged in time, ensuring that the drill bit can continuously remove metal while preventing chips from scratching the lock cylinder hole wall. As a further implementation of this solution, a plurality of keyways 11 are provided on the outer side of the end of the milling shank 1 away from the milling head assembly 2 along the axial direction of the milling shank 1. The plurality of keyways 11 are arranged at equal intervals and are adapted to the hand-held electric drill chuck. It should be noted that the keyway 11 is precisely matched with the protruding structure of the handheld drill jaws. During installation, the jaw protrusions are embedded in the keyway 11 to form a "key connection" structure. Compared with the traditional smooth straight shank, this can prevent the drill head from slipping on the jaws when rotating at high speed, ensuring torque transmission without loss. This solves the core pain point of "insufficient torque of handheld drills" in traditional twist drills and provides a foundation for stable drilling in low-torque scenarios. As a further implementation of this solution, the anti-slip component 3 includes an annular anti-slip groove 31 and an anti-slip ring pad 32. The anti-slip groove 31 is located on the outer side of the middle section of the milling shank 1. The anti-slip ring pad 32 has an annular structure. The height of the anti-slip ring pad 32 is the same as that of the anti-slip groove 31. The outer surface of the anti-slip ring pad 32 is provided with anti-slip texture 33. The thickness of the anti-slip ring pad 32 is the same as the depth of the anti-slip groove 31. The anti-slip ring pad 32 is fitted inside the anti-slip groove 31. It should be noted that the anti-slip groove 31 provides a precise installation space for the anti-slip ring pad 32. The anti-slip ring pad 32 is made of nitrile rubber (wear-resistant, anti-aging, and suitable for long-term use of handheld electric drills). After being fitted, its outer surface is flush with the outer side of the milling shank 1. The anti-slip texture 33 on the outer surface is a cross-shaped diagonal pattern. When the operator installs the milling shank 1, the milling shank 1 can be stabilized by holding the anti-slip ring pad 32 with anti-slip texture 33, avoiding the slippage problem caused by the hand directly contacting the smooth metal milling shank 1. The milling shank 1 can be quickly aligned with the handheld electric drill jaws. As a further implementation of this solution, the anti-slip ring pad 32 is symmetrically provided with mounting rings 34 on the upper and lower sides. The end of the mounting ring 34 away from the anti-slip ring pad 32 is a protruding structure. The upper and lower ends of the anti-slip ring pad 32 are symmetrically provided with mounting grooves 35. The end of the mounting ring 34 near the anti-slip ring pad 32 is fixedly embedded in the mounting groove 35. The inner top wall and inner bottom wall of the anti-slip groove 31 are provided with limiting grooves 36, which are adapted to the protruding structure of the mounting ring 34. It should be noted that the mounting rings 34 on the upper and lower sides of the anti-slip ring pad 32 are metal elastic rings (made of 65Mn spring steel, with good elasticity and toughness), and the end away from the anti-slip ring pad 32 is a hemispherical protrusion. During installation, the end of the mounting ring 34 closest to the anti-slip ring pad 32 is fixedly embedded in the mounting groove 35 (located at both ends of the anti-slip ring pad 32), and then the anti-slip ring pad 32 is embedded into the anti-slip groove 31. At this time, the protrusion of the mounting ring 34 will elastically engage with the limiting grooves 36 (hemispherical grooves adapted to the protrusion) on the top and bottom walls of the anti-slip groove 31, forming a "two-way limiting", which prevents the anti-slip ring pad 32 from sliding along the axial direction of the milling shank 1 and avoids its circumferential rotation, ensuring the long-term stability of the anti-slip effect.

[0018] Workflow: Before use, the anti-slip ring pad 32 needs to be installed. During installation, first align the straight section of the mounting ring 34 with the mounting groove 35 on the anti-slip ring pad 32, insert and fix it in the mounting groove 35. Then, heat the anti-slip ring pad 32 evenly to make it expand slightly and increase its inner diameter. While it is still hot, put the anti-slip ring pad 32 on the bottom of the milling shank 1 and align it with the anti-slip groove 31. Ensure that the protruding structure of the mounting ring 34 corresponds to the position of the limiting groove 36, and then fully engage the protruding structure of the mounting ring 34 into the limiting groove 36. The operator holds the handheld electric drill with one hand and the anti-slip ring pad 32 in the middle of the milling shank 1 with the other hand. Because the surface of the anti-slip ring pad 32 is provided with anti-slip texture 33, it can effectively prevent the hand from slipping. By holding the anti-slip ring pad 32, the milling shank 1 is stabilized. The end of the milling shank 1 away from the milling head assembly 2 is aligned with the electric drill jaws, so that the keyway 11 is aligned with the inner protrusion structure of the jaws. Then, it is pushed in to the jaw clamping position (ensuring that the keyway 11 and the jaws are fully engaged). At this time, the multi-key engagement structure can ensure torque transmission efficiency. Align the milling tip 21 of the milling head assembly 2 with the preset drilling starting point of the blind groove locking structure, adjust the electric drill angle so that the axis of the milling shank 1 is consistent with the drilling direction, start the hand drill, and the multiple cutting edges 23 of the milling tip 21 simultaneously cut into the blind groove locking structure. The arc-shaped milling tip 21 disperses the cutting force, reduces the force per unit area, and avoids workpiece surface cracking. The spiral milling groove 22 continuously removes chips through the spiral angle, and the shallow groove 24 ensures that the chips are discharged in time without accumulation or jamming. The 5°-8° forward angle of the side cutting edge assists in cutting, so that the roughness of the inner wall of the blind groove locking structure is controlled within the standard range.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A deep hole drilling blind thread locking milling head, comprising a milling shank (1) and a milling head assembly (2), characterized in that: The milling shank (1) and the milling head assembly (2) have the same diameter, and the top end of the milling shank (1) and the bottom end of the milling head assembly (2) are fixedly connected. The milling shank (1) is a circular straight shank structure, and the middle section of the milling shank (1) is provided with an anti-slip component (3). The milling head assembly (2) includes a milling tip (21) and a milling groove (22). The milling tip (21) is an arc-shaped structure with multiple cutting edges (23) on it. The milling tip (21) and the milling groove (22) are smoothly connected. The milling groove (22) is spirally distributed on the cylindrical surface at the end of the milling shank (1). It is composed of multiple shallow grooves. The tip of the milling groove (22) is provided with a side cutting edge. The side cutting edge has a normal forward angle.

2. The deep hole drilling blind thread locking milling head according to claim 1, characterized in that: The milling shank (1) has multiple keyways (11) on the outer side of the end away from the milling head assembly (2) along the axial direction of the milling shank (1). The multiple keyways (11) are arranged at equal intervals and are adapted to the hand-held electric drill chuck.

3. A deep hole drilling blind thread locking milling head according to claim 1, characterized in that: The anti-slip component (3) includes an annular anti-slip groove (31) and an anti-slip ring pad (32), wherein the anti-slip groove (31) is located on the outer side of the middle section of the milling shank (1).

4. The blind recess lock drill-mill head of claim 3, wherein: The anti-slip ring pad (32) has an annular structure. The anti-slip ring pad (32) is at the same height as the anti-slip groove (31), and the outer surface of the anti-slip ring pad (32) is provided with anti-slip texture (33).

5. A deep hole drilling blind thread locking milling head according to claim 4, characterized in that: The thickness of the anti-slip ring pad (32) is consistent with the opening depth of the anti-slip groove (31), and the anti-slip ring pad (32) is fitted inside the anti-slip groove (31).

6. A deep hole drilling blind thread locking milling head according to claim 3, characterized in that: The anti-slip ring pad (32) is provided with symmetrical mounting rings (34) on the upper and lower sides. The end of the mounting ring (34) away from the anti-slip ring pad (32) is a protruding structure. The upper and lower ends of the anti-slip ring pad (32) are provided with symmetrical mounting slots (35). The end of the mounting ring (34) near the anti-slip ring pad (32) is fixedly embedded in the mounting slot (35).

7. A deep hole drilling blind thread locking milling head according to claim 6, characterized in that: The inner top wall and inner bottom wall of the anti-slip groove (31) are provided with a limiting slot (36), which is adapted to the protruding structure of the mounting ring (34).

Images