Stepped tool bit spiral groove machining device of stepped drill for composite materials

Abstract

The utility model discloses a stepped tool bit spiral groove machining device of a stepped drill for composite materials, which comprises a movable tool handle mounting seat and a tool handle clamping mechanism, and the movable tool handle mounting seat is in a shaft shape and is integrally formed by a cylindrical optical shaft section and a threaded shaft section with threads. A cutter handle movable installation blind hole is formed in the central axis of the threaded shaft section, at least three open grooves evenly distributed in the radial direction are formed in the threaded shaft section, and the open grooves are communicated with the cutter handle movable installation blind hole. The cutter handle clamping mechanism comprises a locking nut and a clamping rotating block with the section in a right trapezoid shape, the locking nut is screwed with the threaded shaft section, the clamping rotating block is arranged in the open groove and is in sliding fit with the open groove, and the inclined face of the clamping rotating block extends out of the open groove. The bottom of the clamping rotating block is hinged to the two sides of the open groove. The spiral groove machining device can machine spiral grooves of stepped tool bits of various sizes, is simple in structure and easy and convenient to operate, and reduces production cost.

Description

Technical Field

[0001] The utility model relates to a step drill processing device, in particular to a step cutter head spiral groove processing device for a step drill for composite materials, belonging to the technical field of drilling tools. Background Art

[0002] Composite materials are two-phase or multi-phase structural materials made by mixing a soft and viscous matrix material with a high-strength and high-hardness fiber-reinforced material. Their anisotropy, low thermal conductivity, and low interlayer bonding strength make them typical difficult-to-process materials. For example, carbon fiber reinforced composite materials (CFRP), as an advanced composite material, have excellent comprehensive properties such as high specific strength, high specific stiffness, fatigue resistance, corrosion resistance, and excellent designability. They have been widely used in aerospace, automotive and other fields, such as the Airbus A350XWB. The extensive use of composite materials has greatly reduced the weight of aircraft structures and improved the fuel economy of aircraft. However, in order to achieve the connection and assembly of composite parts, a series of mechanical processing is required, and drilling is one of the most labor-intensive mechanical processing. Since composite materials show obvious anisotropy and stacking characteristics in the macroscopic view, the interlayer bonding strength is much lower than that in other directions. When drilling, due to the weak constraints of the entrance and exit positions, the drill tip is very likely to generate a large axial force, push open the outermost layers of materials, and cause stratification damage. The fiber cannot be cut, which causes fiber bending, tearing, burrs and other damage. For this reason, domestic and foreign researchers have developed a variety of drilling tools with different structural geometric forms. Among them, the step drill solves the technical problems of easy stratification of composite materials during drilling, and completes the entire processing process in one go, while achieving better hole surface quality. However, due to the large number of holes that need to be drilled on the composite material and the different hole diameters, the step drill has a wide variety of spiral groove sizes. The existing step drill spiral groove processing device is usually a processing device for processing a spiral groove of one size, resulting in a large number of spiral groove processing devices, which greatly increases the production cost. Summary of the invention

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and to provide a processing device which can process spiral grooves of stepped cutter heads of various sizes, can reduce production costs and has a simple structure and is easy to operate.

[0004] In order to solve the above technical problems, the utility model adopts a step cutter head spiral groove processing device for a step drill for composite materials, the step drill includes a step cutter head and a cylindrical shank, the step cutter head spiral groove processing device includes a shank movable mounting seat and a shank clamping mechanism, the shank movable mounting seat is shaft-shaped and is integrally made of a cylindrical optical axis section and a threaded shaft section with a thread, a shank movable mounting blind hole is provided on the central axis of the threaded shaft section, at least three radially evenly distributed open grooves are provided on the threaded shaft section, and the open grooves are connected with the shank movable mounting blind hole; the shank clamping mechanism includes a locking nut and a clamping rotating block with a right-angled trapezoidal cross-section, the locking nut is screwed with the threaded shaft section, the clamping rotating block is placed in the open groove and slidably cooperates with the open groove, the inclined surface of the clamping rotating block extends out of the open groove, and the bottom of the clamping rotating block is hinged to both sides of the open groove.

[0005] As a preferred embodiment of the utility model, a tool handle height adjustment screw hole for adjusting the tool handle height is opened on the central axis of the optical axis segment, the tool handle height adjustment screw hole is connected with the tool handle movable mounting blind hole, and a screw is screwed in the tool handle height adjustment screw hole.

[0006] As a preferred embodiment of the utility model, the bottom of the clamping rotating block is hinged to the two sides of the opening slot through short pins.

[0007] After adopting the above structure, the utility model has the following beneficial effects:

[0008] When the utility model is working, the tool holder movable mounting blind hole in the tool holder movable mounting seat can be used to place step drill tool holders of different sizes, the locking nut in the tool holder clamping mechanism is rotated to make the clamping rotating block synchronously clamp the tool holder, and then the optical axis section in the tool holder movable mounting seat is fixedly installed on the machine tool to perform milling processing on the spiral groove of the step cutter head. The utility model can process the spiral grooves of step cutter heads of various sizes by using one processing device.

[0009] The utility model provides a tool handle height adjustment screw hole on the central axis of the optical axis section, and the height of the tool handle in the tool handle movable installation blind hole can be adjusted by screwing a screw rod into the tool handle height adjustment screw hole, so that stepped cutter head spiral grooves with different lengths and depths can be processed. With such a structure, the spiral groove processing range of the step drill is further expanded.

[0010] The utility model has a simple structure and is easy to operate, thus greatly reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0012] Figure 1The utility model is a structural schematic diagram of a spiral groove processing device of a stepped cutter head of a composite material step drill.

[0013] Figure 2 for Figure 1 Schematic top view of .

[0014] Figure 3 The utility model is a structural schematic diagram of a step drill.

[0015] Figure 4 It is a structural schematic diagram of the screw in the utility model. DETAILED DESCRIPTION

[0016] See also Figures 1 to 4 The step drill 1 includes a step drill head 1-1 and a cylindrical shank 1-2. The step drill head 1-1 is provided with a spiral groove 1-3. The step drill head spiral groove processing device includes a shank movable mounting seat 2 and a shank clamping mechanism 3. The shank movable mounting seat 2 is shaft-shaped and is integrally made of a cylindrical optical shaft section 2-1 and a threaded shaft section 2-2 with a thread. A shank movable mounting blind hole 2-3 is provided on the central axis of the threaded shaft section 2-2. At least three radially evenly distributed open grooves 2-4 are provided on the threaded shaft section 2-2. The open grooves 2-4 are connected with the shank movable mounting blind hole 2-3. In the utility model, Figure 1 , 2 As shown, the number of the opening grooves 2-4 is preferably four, but it can also be six, eight, etc., although three, six, eight, etc. are not shown in the figure; the tool holder clamping mechanism 3 comprises a locking nut 3-1 and a clamping rotating block 3-2 having a right-angled trapezoidal cross-section, the locking nut 3-1 being threadedly engaged with the threaded shaft section 2-2, the clamping rotating block 3-2 being placed in the opening groove 2-4 and slidingly engaged with the opening groove 2-4, the inclined surface of the clamping rotating block 3-2 extending out of the opening groove 2-4, and the bottom of the clamping rotating block 3-2 being hinged to both sides of the opening groove 2-4.

[0017] As a preferred embodiment of the present invention, Figure 1 , 2 As shown in , 4, a tool handle height adjustment screw hole 2-5 for adjusting the height of the tool handle 1-2 is opened on the central axis of the optical axis segment 2-1, and the tool handle height adjustment screw hole 2-5 is connected with the tool handle movable mounting blind hole 2-3, and a screw rod 4 is screwed into the tool handle height adjustment screw hole 2-5. The height of the tool handle 1-2 in the tool handle movable mounting blind hole 2-3 can be adjusted by rotating the screw rod 4 forward and backward.

[0018] As a preferred embodiment of the present invention, the bottom of the clamping rotating block 3-2 is hinged to both sides of the opening slot 2-4 through a short pin, which is not shown in the figure. In the present invention, the bottom of the clamping rotating block 3-2 can also be hinged to both sides of the opening slot 2-4 through conventional structures such as steel balls and springs, which are not shown in the figure.

[0019] When the utility model is working, the tool handle movable mounting blind hole 2-3 in the tool handle movable mounting seat 2 can be used to place step drill tool handles 1-2 of different sizes, and the locking nut 3-1 in the tool handle clamping mechanism 3 is rotated to make the clamping rotating block 3-2 synchronously clamp the tool handle 1-2, and then the optical axis section 2-1 in the tool handle movable mounting seat 2 is fixedly installed on the machine tool to perform milling processing on the spiral groove 1-3 of the step tool head 1-1. The utility model can process the spiral grooves of step tool heads of various sizes by using one processing device.

[0020] After trial use, the utility model can process spiral grooves of stepped cutter heads of various sizes by using one processing device, has a simple structure, is easy to operate, reduces production costs, and achieves good practical effects.

Claims

1. A device for processing spiral grooves with a stepped cutter head of a composite material step drill, the step drill (1) comprising a stepped cutter head (1-1) and a cylindrical shank (1-2), characterized in that: The stepped tool head spiral groove processing device comprises a tool handle movable mounting seat (2) and a tool handle clamping mechanism (3); the tool handle movable mounting seat (2) is shaft-shaped and is integrally made of a cylindrical optical shaft section (2-1) and a threaded shaft section (2-2) having a thread; a tool handle movable mounting blind hole (2-3) is provided on the central axis of the threaded shaft section (2-2); at least three radially evenly distributed open grooves (2-4) are provided on the threaded shaft section (2-2); the open grooves (2-4) are connected to the tool handle movable mounting blind hole (2-3) and the tool handle movable mounting blind hole (2-3) is ... and the tool handle movable mounting blind hole (2-3) are connected to the tool handle movable mounting blind hole (2-3) and the tool handle movable mounting blind hole (2-3) and the tool handle movable mounting blind hole (2-3) are connected to the tool handle movable mounting blind hole (2-3) and the tool handle movable mounting blind hole (2-3) and the tool handle movable mounting blind hole (2-3) are connected to the tool handle movable mounting blind hole (2-3) and the tool handle movable mounting blind hole (2-3) and the tool handle movable mounting blind hole (2-3) are connected to the tool handle movable mounting blind hole (2 The holes (2-3) are interlinked; the tool handle clamping mechanism (3) comprises a locking nut (3-1) and a clamping rotating block (3-2) having a right-angle trapezoidal cross section, the locking nut (3-1) is threadedly engaged with the threaded shaft section (2-2), the clamping rotating block (3-2) is disposed in the opening groove (2-4) and slidably cooperates with the opening groove (2-4), the inclined surface of the clamping rotating block (3-2) extends out of the opening groove (2-4), and the bottom of the clamping rotating block (3-2) is hinged to both sides of the opening groove (2-4).

2. The device for processing spiral grooves with a stepped cutter head of a composite material step drill according to claim 1, characterized in that: A tool handle height adjustment screw hole (2-5) for adjusting the height of the tool handle (1-2) is provided on the central axis of the optical axis section (2-1); the tool handle height adjustment screw hole (2-5) is connected to a tool handle movable installation blind hole (2-3); and a screw rod (4) is screwed into the tool handle height adjustment screw hole (2-5).

3. The device for processing spiral grooves with a stepped cutter head of a composite material step drill according to claim 1 or 2, characterized in that: The bottom of the clamping rotating block (3-2) is hinged to two sides of the opening slot (2-4) via short pins.

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