High-strength alloy girdling stepped drill

Abstract

The utility model relates to a high-strength alloy girdling stepped drill which comprises a drill body part and a drill tip part arranged at the front end of the drill body part, the drill tip part is detachably connected with the drill body part, a first drill handle is arranged at the rear end of the drill tip part, an embedding part is arranged at one end of the first drill handle, and a positioning hole is formed in the embedding part in a penetrating mode. An inserting hole matched with the first drill handle is formed in the center of the drill body part in a penetrating mode, so that the inserting hole is matched with the first drill handle to achieve rotation limiting of the drill tip part, a second drill handle is arranged at the position, located at the inserting hole, of the rear end of the drill body part, an inserting groove communicated with the inserting hole is formed in the front end of the second drill handle, and an embedding head part is embedded in the inserting groove. Through holes are formed in the positions, located at the positioning holes, of the two sides of the inserting groove in a penetrating mode, a fastener is embedded into the through holes and the positioning holes, limiting of the embedded head part is achieved, the fastener penetrates through the first drill handle and the second drill handle to achieve limiting and fixing, and therefore drilling and positioning do not need to be conducted on the side wall of the drill body. And the problem that the through hole is blocked by chippings in the drilling process is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of hole-opening tool technology, and in particular to a high-strength alloy circumferential step drill. Background Technology

[0002] A step drill, also known as a pagoda drill, allows one drill bit to replace multiple drill bits, machining holes of different diameters as needed, and can complete large holes in one pass without changing drill bits or drilling positioning holes. Pagoda drills are generally of a single, integral structure. When the cutting edge of the drill tip is damaged, the entire drill cannot continue cutting, requiring replacement of the entire drill. This results in low utilization and increased operating costs. Chinese patent document CN202122370026.3 discloses a pagoda drill with a detachable drill body. Adjacent drill bodies are connected by a shank and secured with fasteners penetrating the side walls of the drill bodies. This design makes it easy for debris to enter the screw holes and fastener grooves during drilling, causing blockages that are difficult to clean and hindering the normal assembly and disassembly of the drill body. Utility Model Content

[0003] To address the aforementioned problems, this utility model discloses a high-strength alloy circumferential step drill, which solves the problem that in the prior art, the detachable structure of the pagoda drill is easily blocked by the screw holes when positioned through the drill body surface, affecting normal disassembly.

[0004] The specific technical solution is as follows:

[0005] A high-strength alloy circumferential step drill includes a drill body and a drill tip located at the front end of the drill body. The drill tip and the drill body are detachably connected. A drill shank is located at the rear end of the drill tip, and a head is located at one end of the drill shank. A positioning hole is horizontally provided through the head. An insertion hole that mates with the drill shank is provided through the center of the drill body, so that the insertion hole and the drill shank cooperate to limit the rotation of the drill tip. A second drill shank is located at the rear end of the drill body at the insertion hole, and a slot communicating with the insertion hole is opened at the front end of the second drill shank. The head is embedded in the slot, and through holes are provided on both sides of the slot at the positioning hole. A fastener is embedded in the through hole and the positioning hole to limit the head.

[0006] Furthermore, the inner walls of the through hole and the positioning hole are provided with internal threads, and the fastener is a headless bolt, which is threadedly connected to the through hole and the positioning hole.

[0007] Furthermore, the two ends of the headless bolt do not extend beyond the through hole.

[0008] Furthermore, the drill shank is adapted to the size and shape of the insertion hole, and both the drill shank and the insertion hole have a regular hexagonal cross-section.

[0009] Furthermore, the size and shape of the insert head are adapted to the slot, and the cross-sections of both the insert head and the slot are circular.

[0010] Furthermore, the drill shank 2 is fixed to the drill body by welding.

[0011] The beneficial effects of this utility model are reflected in:

[0012] This invention uses a detachable connection between the easily damaged drill tip and the drill body. When fixing the drill tip, drill shank 1 is passed through the drill body and embedded in drill shank 2. Then, fasteners are used to pass through drill shank 1 and drill shank 2 to achieve limiting and fixing. This eliminates the need to open a hole on the side wall of the drill body for positioning, effectively avoiding the problem of debris clogging the through hole during drilling. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the structure after the drill body and drill tip are separated in this utility model.

[0015] Figure 3 This is a cross-sectional view of the present invention.

[0016] Explanation of reference numerals in the attached drawings: Drill body 1, Drill shank 11, Insert head 12, Positioning hole 121, Drill tip 2, Insert hole 21, Drill shank 22, Slot 221, Through hole 222, Fastener 3. Detailed Implementation

[0017] To make the technical solution of this utility model clearer and more explicit, the utility model will be further described below with reference to the accompanying drawings. Any solution derived by equivalent substitution and conventional reasoning of the technical features of this utility model falls within the protection scope of this utility model. The fixed connections and fixed settings mentioned in this utility model are all common connection methods in the mechanical field, including welding, bolt and nut connections, and screw connections.

[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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 element 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 this utility model.

[0019] Please see the appendix Figure 1-3 This embodiment provides a high-strength alloy circumferential step drill, including a drill body 1 and a drill tip 2 disposed at the front end of the drill body 1. The drill tip 2 is detachably connected to the drill body 1. The rear end of the drill tip 2 is provided with a drill shank 11, and one end of the drill shank 11 is provided with a head 12. A positioning hole 121 is horizontally provided through the head 12. The center of the drill body 1 is provided with an insertion hole 21 that cooperates with the drill shank 11, so that the insertion hole 21 cooperates with the drill shank 11 to achieve rotational limitation of the drill tip 2. The rear end of the drill body 1 is provided with a drill shank 22 at the position of the insertion hole 21, and the front end of the drill shank 22 is provided with a slot 221 that communicates with the insertion hole 21. The head 12 is embedded in the slot 221, and through holes 222 are provided on both sides of the slot 221 at the position of the positioning hole 121. A fastener 3 is embedded in the through hole 222 and the positioning hole 121 to limit the head 12.

[0020] In this embodiment, both the through hole 222 and the positioning hole 121 are provided with internal threads, and the fastener 3 is a headless bolt. The headless bolt is threadedly connected to the through hole 222 and the positioning hole 121. When fixing, the headless bolt is used to ensure that both ends of the headless bolt do not exceed the through hole 222, so as to avoid affecting the clamping of the electric drill.

[0021] In this embodiment, the size and shape of the drill shank 11 and the insertion hole 21 are adapted to each other, and the cross-sections of both the drill shank 11 and the insertion hole 21 are regular hexagonal structures, thereby achieving the limiting between the drill tip 2 and the drill body 1.

[0022] In this embodiment, the drill shank 22 is fixed to the drill body 1 by rotational welding, and the size and shape of the insert head 12 are adapted to the slot 221. The cross-sections of the insert head 12 and the slot 221 are both circular. The circular structure ensures that the insert head 12 can be smoothly inserted into the slot 221 after the drill shank 22 is rotated and welded.

[0023] When installing the drill tip 2, first align the drill tip 2 with the chip removal groove and cutting edge of the drill body 1, then insert the drill shank 11 of the drill tip 2 into the slot 221 of the drill body 1. At this time, the position of the positioning hole 121 coincides with the position of the through hole 222. Finally, screw the headless bolt into the through hole 222 and the positioning hole 121 to achieve the limiting and fixing of the drill tip 2.

[0024] 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 within the technical scope disclosed in 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 high-strength alloy circumferential step drill, comprising a drill body (1) and a drill tip (2) disposed at the front end of the drill body (1), wherein the drill tip (2) and the drill body (1) are detachably connected, characterized in that, The drill tip (2) has a drill shank (11) at its rear end. One end of the drill shank (11) has a head insert (12), and a positioning hole (121) is horizontally provided through the head insert (12). The drill body (1) has a hole (21) through its center that mates with the drill shank (11), so that the hole (21) mates with the drill shank (11) to limit the rotation of the drill tip (2). The rear end of the drill body (1) is located at the position of the hole (21). A drill shank 2 (22) is provided at the position, and a slot (221) communicating with the insertion hole (21) is provided at the front end of the drill shank 2 (22). The insert head (12) is embedded in the slot (221), and through holes (222) are provided on both sides of the slot (221) at the position of the positioning hole (121). A fastener (3) is embedded in the through hole (222) and the positioning hole (121) to limit the position of the insert head (12).

2. A high strength alloy ring-slit stepped drill according to claim 1 wherein, The inner walls of the through hole (222) and the positioning hole (121) are provided with internal threads, and the fastener (3) is a headless bolt, which is threadedly connected to the through hole (222) and the positioning hole (121).

3. A high strength alloy ring-slit stepped drill according to claim 2 wherein, The headless bolt's two ends do not extend beyond the through hole (222).

4. A high strength alloy ring-slit stepped drill according to claim 1 wherein, The size and shape of the drill shank (11) are adapted to the insertion hole (21), and the cross-sections of both the drill shank (11) and the insertion hole (21) are regular hexagonal structures.

5. A high strength alloy ring-slit stepped drill according to claim 1 wherein, The size and shape of the insert head (12) are adapted to the slot (221), and the cross-sections of both the insert head (12) and the slot (221) are circular.

6. A high strength alloy ring-slit stepped drill according to claim 1 wherein, The drill shank 2 (22) is fixed to the drill body (1) by welding.

Images