High-efficiency composite drill for composite material laminated hole machining

Abstract

The utility model discloses a kind of high-efficiency composite drills for composite material laminated hole processing, including drill handle and drill bit, the drill bit is set to drill handle end, the drill bit includes first step and second step, the second step is between first step and drill handle, the first step is equipped with drill tip away from one end of drill handle, the first step is used for drilling, the second step is used for expanding reaming, the first step is equipped with two first flutes of center symmetry, first flute side is equipped with first peripheral edge, the second step is equipped with two second flutes corresponding with first flute, tooth back and main peripheral edge are equipped between two second flutes, main peripheral edge is connected with first peripheral edge by connecting step surface;The high-efficiency composite drill for composite material laminated hole processing of the utility model, using first step realizes drilling, using second step realizes reaming expansion, can complete drilling and reaming work in one time, greatly improves processing efficiency and processing accuracy.

Description

Technical Field

[0001] This utility model relates to milling technology, specifically a high-efficiency composite drill for machining composite material stacked holes. Background Technology

[0002] With the rapid development of the aerospace industry, composite materials have become the main constituent materials of modern aircraft, satellites and spacecraft due to their excellent performance and wide applicability.

[0003] Machining composite materials is challenging, especially for high-precision holes, which places extremely high demands on the cutting tools. However, the conventional method for machining holes in composite laminates is to drill directly and then use a reamer to ensure hole quality. This means that after drilling, the tool must be changed to ream the hole, requiring two machining operations for each hole. This is inefficient, and the two machining operations can easily lead to deviations in the straightness and coaxiality of the hole. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a high-efficiency composite drill for machining composite material stacked holes, which can complete drilling and reaming in one go, greatly improving machining efficiency and machining accuracy.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: a high-efficiency composite drill for machining composite layered holes, comprising a drill shank and a drill bit, wherein the drill bit is disposed at the end of the drill shank, the drill bit comprising a first step and a second step, the second step being located between the first step and the drill shank, the first step having a drill tip at the end away from the drill shank, the first step being used for drilling holes, the second step being used for reaming holes, the first step having two centrally symmetrically arranged first chip removal grooves, one side of the first chip removal groove having a first peripheral cutting edge, the second step having two second chip removal grooves corresponding to the first chip removal grooves, a tooth back and a main peripheral cutting edge being provided between the two second chip removal grooves, the main peripheral cutting edge being connected to the first peripheral cutting edge through a connecting step surface.

[0006] Preferably, the radial rake angle of the tooth gap of the drill tip is -1 to 0 degrees.

[0007] Preferably, the radial front angle of the connecting step surface is -13 degrees.

[0008] Preferably, the tooth back is provided with a secondary groove, and the included angle between the secondary groove and the main peripheral cutting edge is 60 degrees.

[0009] Preferably, a secondary peripheral blade is provided on one side of the secondary groove.

[0010] Preferably, the secondary peripheral blade and the main peripheral blade are evenly provided with a plurality of tooth break grooves at the end facing the first step.

[0011] In summary, this utility model achieves the following technical effects: This utility model discloses a high-efficiency composite drill for machining holes in composite materials. It uses a first step to achieve drilling and a second step to achieve reaming and enlargement, which can complete the drilling and reaming work in one go, greatly improving the processing efficiency and processing accuracy. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural schematic diagram of the high-efficiency composite drill for machining composite material stacked holes according to this utility model; Figure 2 This is a schematic diagram of the drill bit structure of the high-efficiency composite drill for machining composite material stacked holes according to this utility model; Figure 3 This is a cross-sectional view of the first step of the high-efficiency composite drill for machining composite material stacked holes according to this utility model; Figure 4 This is a cross-sectional view of the second step of the high-efficiency composite drill for machining composite material stacked holes according to this utility model; Explanation of reference numerals in the accompanying drawings: 1. Drill shank; 2. Drill tip; 3. First step; 31. First chip removal groove; 32. First peripheral cutting edge; 4. Second step; 41. Second chip removal groove; 42. Secondary groove; 43. Tooth break groove; 44. Main peripheral cutting edge; 45. Secondary peripheral cutting edge; 5. Connecting step surface. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings.

[0014] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0015] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0017] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0019] Example 1: like Figure 1 As shown, a high-efficiency composite drill for machining holes in composite materials includes a drill shank 1 and a drill bit, wherein the drill bit is disposed at the end of the drill shank 1. like Figure 2-4 As shown, the drill bit includes a first step 3 and a second step 4. The second step 4 is located between the first step 3 and the drill shank 1. The first step 3 has a drill tip 2 at the end away from the drill shank 1. The first step 3 is used for drilling holes, and the second step 4 is used for reaming holes. The first step 3 has two centrally symmetrically arranged first chip removal grooves 31. A first peripheral cutting edge 32 is provided on one side of the first chip removal groove 31. The second step 4 has two second chip removal grooves 41 corresponding to the first chip removal grooves 31. A tooth back and a main peripheral cutting edge 44 are provided between the two second chip removal grooves 41. The main peripheral cutting edge 44 and the first peripheral cutting edge 32 are connected by a connecting step surface 5.

[0020] The high-efficiency composite drill for machining composite material stacked holes in this embodiment uses the first step 3 to achieve drilling and the second step 4 to achieve reaming and enlargement, which can complete the drilling and reaming work in one go, greatly improving the processing efficiency and processing accuracy.

[0021] The radial rake angle of the backlash of the drill tip is -1 to 0 degrees. The radial rake angle of the backlash of a conventional drill tip 2 is between -10 and -15 degrees. The radial rake angle of the backlash of the new drill tip 2 is close to 0 degrees to ensure that the radial rake angle of the drill tip 2 is maximized. The sharpness of the tool is better than that of the conventional drill tip 2, and the actual drilling is easier.

[0022] The radial rake angle of the connecting step surface 5 is -13 degrees; the connecting step surface 5 is a lip-compensated small cutting plane, and its radial rake angle of -13° allows the strength of the step and the sharpness of the cutting edge to reach a balance. Increasing the rake angle can reduce cutting resistance and improve the quality of the machined hole exit position.

[0023] The tooth back is provided with a secondary groove 42, and the included angle between the secondary groove 42 and the main peripheral cutting edge 44 is 60 degrees. The secondary groove 42 can provide support during the machining process, reduce vibration, and thus effectively ensure the hole diameter tolerance.

[0024] A secondary peripheral blade 45 is provided on one side of the secondary groove 42; a plurality of broken tooth grooves 43 are evenly provided on the secondary peripheral blade 45 and the main peripheral blade 44 facing the first step 3; during carbon fiber hole processing, due to the characteristics of the material, burrs are often generated at the exit position after processing. If a certain hole diameter ratio is reached, it will be NG. The secondary peripheral blade 45 and the main peripheral blade 44 are made with broken tooth grooves 43 so that when the tool is retracted after processing, the burrs will be scraped off.

[0025] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. A high-efficiency composite drill for machining holes in composite materials, characterized in that, The drill bit includes a drill shank and a drill bit. The drill bit is disposed at the end of the drill shank. The drill bit includes a first step and a second step. The second step is located between the first step and the drill shank. The end of the first step away from the drill shank is provided with a drill tip. The first step is used for drilling holes, and the second step is used for reaming holes. The first step is provided with two centrally symmetrically arranged first chip removal grooves. A first peripheral cutting edge is provided on one side of the first chip removal groove. The second step is provided with two second chip removal grooves corresponding to the first chip removal grooves. A tooth back and a main peripheral cutting edge are provided between the two second chip removal grooves. The main peripheral cutting edge is connected to the first peripheral cutting edge through a connecting step surface.

2. The high-efficiency composite drill for machining composite layered holes according to claim 1, characterized in that, The radial rake angle of the tooth clearance of the drill tip is -1 to 0 degrees.

3. The high-efficiency composite drill for machining composite layered holes according to claim 1, characterized in that, The radial front angle of the connecting step surface is -13 degrees.

4. The high-efficiency composite drill for machining composite layered holes according to claim 1, characterized in that, The tooth back is provided with a secondary groove, and the included angle between the secondary groove and the main peripheral cutting edge is 60 degrees.

5. The high-efficiency composite drill for machining composite layered holes according to claim 4, characterized in that, A secondary peripheral blade is provided on one side of the secondary groove.

6. The high-efficiency composite drill for machining composite layered holes according to claim 5, characterized in that, The secondary and main peripheral blades are evenly provided with several tooth break grooves at the end facing the first step.

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