Deep hole drill special for casting aluminum alloy

Abstract

The utility model belongs to the technical field of deep hole drills, and particularly relates to a deep hole drill special for cast aluminum alloy. The deep hole drill special for the cast aluminum alloy comprises a cutter handle part and a cutting edge part which are coaxially arranged. Wherein two chip grooves which spirally and alternately extend in the axial direction are formed in the blade part; the spiral angle alpha of the chip groove ranges from 10 degrees to 20 degrees. The blade part comprises a large core thickness section and a variable core thickness section from front to back; the outer diameter of the blade part is D, the core thickness of the large core thickness section is 40%-46% D, and the taper of the core thickness of the variable core thickness section is gradually changed from 40%-46% D to 25%-28% D from front to back. According to the deep hole drill special for casting the aluminum alloy, the design of a small spiral angle, a large core thickness and a taper core thickness is adopted. Due to the small spiral angle, the rigidity of the cutter is improved, meanwhile, the chip removal distance is shortened, and cuttings generated in the machining process can be rapidly discharged. Due to the design of the large core thickness and the taper core thickness, the cutter rigidity is provided, and meanwhile smooth discharging of cuttings is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of deep hole drills, and particularly relates to a special deep hole drill for cast aluminum alloy. Background Art

[0002] In the mechanical processing industry, deep hole drilling is a common processing method. Usually, a hole with a depth-diameter ratio L / D greater than 5 is defined as a deep hole. During the deep hole processing, since the overall length of the drill bit is relatively long, tool breakage is a relatively common failure form.

[0003] At present, most of the commonly used aluminum alloy deep hole drills on the market adopt a helix angle of 25° - 30° (such as Figure 1 ), and the core thickness diameter of the tool is generally distributed between 20% - 35% D (such as Figure 2 ), where D is the tool diameter. There are generally two main reasons for the drill bit to break:

[0004] 1. The chip removal of the tool is difficult. During the processing, due to the relatively deep hole, the chip removal path is long, and it is easy to cause the chips to be extruded and accumulated in the chip removal groove 21, resulting in tool breakage.

[0005] 2. Since the tool is relatively long, in order to ensure chip removal, the chip removal groove 21 of the tool is also relatively long, and the tool rigidity is relatively poor, which is also easy to cause tool breakage. Content of the Utility Model

[0006] The purpose of the utility model is to provide a special deep hole drill for cast aluminum alloy to solve the technical problem of easy breakage of the existing aluminum alloy deep hole drill during the processing.

[0007] This application provides a special deep hole drill for cast aluminum alloy. The special deep hole drill for cast aluminum alloy includes:

[0008] A tool shank part and a cutting edge part arranged coaxially; where

[0009] Two chip removal grooves extending alternately in a spiral along the axis are arranged on the cutting edge part; the helix angle α of the chip removal groove is 10° - 20°; and

[0010] The cutting edge part includes a large core thickness section and a variable core thickness section from front to back;

[0011] The outer diameter of the cutting edge part is D, the core thickness of the large core thickness section is 40% - 46% D, and the core thickness of the variable core thickness section tapers from 40% - 46% D to 25% - 28% D from front to back.

[0012] In an embodiment of this application, the helix angle α of the chip removal groove is 12° - 15°.

[0013] In an embodiment of this application, the length of the large core thickness section is 1 - 1.5D.

[0014] In an embodiment of the present application, the length of the variable core thickness section is 4D - 29D.

[0015] In an embodiment of the present application, the major axis ratio of the cutting edge part is 5 - 30.

[0016] The beneficial effects of the present utility model are as follows: on the cutting edge part of the special deep hole drill for cast aluminum alloy of the present utility model, there are two chip flutes spirally extending alternately along the axis, and the spiral angle α of the chip flutes is 10° - 20°. Compared with the traditional spiral angle of 25° - 30°, under the condition that other structural parameters are the same, the chip removal path of the tool is significantly shortened, and the rigidity of the tool is effectively improved; and the cutting edge part includes a large core thickness section and a variable core thickness section from front to back. While the increase in the core thickness of the front section improves the rigidity of the tool, the gradual decrease in the core thickness of the rear variable core thickness section widens the width of the chip flute in the rear section and also ensures the smooth discharge of chips.

[0017] Other features and advantages of the present utility model will be described in the subsequent specification, and, in part, will be obvious from the specification, or will be understood by implementing the present utility model. The objectives and other advantages of the present utility model are achieved and obtained by the structures specifically pointed out in the specification and the drawings.

[0018] To make the above objectives, features, and advantages of the present utility model more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the spiral angle of a prior art deep hole drill for aluminum alloy;

[0021] Figure 2 It is a schematic diagram of the core thickness of a prior art deep hole drill for aluminum alloy;

[0022] Figure 3 It is a schematic diagram of the spiral angle of the special deep hole drill for cast aluminum alloy of the present utility model;

[0023] Figure 4 It is a schematic diagram of the core thickness of the special deep hole drill for cast aluminum alloy of the present utility model.

[0024] In the figure: shank part 1, cutting edge part 2, chip flute 21. Specific Embodiments

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0026] This application provides a special deep hole drill for cast aluminum alloy, which will be described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of this application. And in the following embodiments, each embodiment has its own emphasis. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0027] See Figure 3 and Figure 4 , in an embodiment of the present application, the special deep hole drill for cast aluminum alloy includes: a tool shank portion 1 and a cutting edge portion 2 arranged coaxially.

[0028] Preferably, two chip flutes 21 extending spirally and alternately along the axial direction are provided on the cutting edge portion 2; the spiral angle α of the chip flutes 21 is 10° - 20°; by setting the spiral angle α to 10° - 20°, compared with the traditional spiral angle of 25° - 30°, under the condition that other structural parameters are the same, the chip removal path of the tool is significantly shortened, and the rigidity of the tool is effectively improved.

[0029] In this embodiment, further preferably, the spiral angle α of the chip flutes 21 is 12° - 15°.

[0030] Preferably, the cutting edge portion 2 includes a large core thickness section and a variable core thickness section from front to back; the outer diameter of the cutting edge portion 2 is D, the core thickness of the large core thickness section is 40% - 46% D, and the core thickness of the variable core thickness section tapers from 40% - 46% D to 25% - 28% D from front to back.

[0031] In this embodiment, the length of the large core thickness section is 1 - 1.5D. The core thickness of the large core thickness section is 40% - 46% D, which can improve the rigidity of the tool. The rest is the variable core thickness section, and the core thickness tapers to 25% - 28% D. Since the reduction of the core thickness at the rear end broadens the width of the chip flute at the rear end, it also ensures the smooth discharge of the chips.

[0032] In this embodiment, optionally, the length of the variable core thickness section is 4D - 29D.

[0033] In this embodiment, optionally, the length-diameter ratio of the cutting edge portion 2 is 5 - 30.

[0034] In summary, the special deep hole drill for cast aluminum alloy of the present utility model adopts the design of small helix angle and large core thickness plus tapered core thickness. The small helix angle shortens the chip removal distance while improving the tool rigidity, enabling the chips generated during the machining process to be quickly discharged. The design of large core thickness plus tapered core thickness ensures the smooth discharge of chips while providing tool rigidity.

[0035] Each device (components without specific structures described) selected in this application is a general standard component or a component known to those skilled in the art, and its structure and principle can be known by those skilled in the art through technical manuals or by conventional experimental methods.

[0036] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection.

[0037] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] Taking the above-mentioned ideal embodiments of the present utility model as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A deep hole drill for cast aluminum alloy, characterized in that: include: A handle portion (1) and a blade portion (2) are coaxially arranged; wherein The blade portion (2) is provided with two chip removal grooves (21) extending alternately in an axial spiral; the helix angle α of the chip removal grooves (21) is 10°-20°; and The blade portion (2) comprises a large core thickness section and a variable core thickness section from front to back; The outer diameter of the blade portion (2) is D, the core thickness of the large core thickness section is 40%-46%D, and the core thickness of the variable core thickness section tapers from 40%-46%D to 25%-28%D from front to back.

2. The deep hole drill for cast aluminum alloy according to claim 1, characterized in that: The helix angle α of the chip removal groove (21) is 12°-15°.

3. The deep hole drill for cast aluminum alloy according to claim 1, characterized in that: The length of the thick core section is 1-1.5D.

4. The deep hole drill for cast aluminum alloy according to claim 1, characterized in that: The length of the variable core thickness section is 4D-29D.

5. The deep hole drill for cast aluminum alloy according to claim 1, characterized in that: The aspect ratio of the blade portion (2) is 5-30.

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