Tapered drill for machining tapered hole of aluminum alloy steering knuckle

Abstract

This utility model provides a taper drill for machining tapered holes in aluminum alloy steering knuckles, comprising: a shank and a cutting edge portion connected to the shank. The cutting edge portion includes at least two cutting edges symmetrically arranged about the center line of the shank, with a chip removal groove between the two cutting edges. The cutting edge diameter increases in a stepped manner, with the diameter d1 of the cutting edge furthest from the shank being smaller than the diameter d2 of the cutting edge closest to the shank. The cutting edge diameter d1 is less than or equal to the minimum diameter D1 of the tapered hole. This taper drill for machining tapered holes in aluminum alloy steering knuckles reduces the contact area between the tool edge and the workpiece when machining tapered holes using an angled head, thereby reducing cutting resistance, minimizing tool vibration and deformation, and ultimately reducing tool wear and increasing tool life.

Description

Technical Field

[0001] This utility model relates to the field of machining, and in particular to a tapered drill for machining tapered holes in aluminum alloy steering knuckles. Background Technology

[0002] In the machining of tapered holes in aluminum alloy steering knuckle workpieces, ordinary tapered drill bits are typically used. However, in actual machining, due to part clamping limitations, interference issues, or customer process requirements, angle heads are often required. An angle head is a machine tool accessory that allows the tool's rotation center line to form a certain angle with the spindle's rotation center line, thereby expanding the machine tool's machining range and adaptability.

[0003] In the process of developing the existing technology, the inventors discovered that:

[0004] When using an angle head to machine tapered holes, the torque transmission efficiency of the tool decreases and its rigidity deteriorates. This requires the tool to withstand greater cutting resistance to overcome the instability caused by insufficient torque and rigidity. Consequently, the tool is prone to vibration and deformation during the cutting process, which accelerates tool wear, shortens tool life, and may even lead to problems such as tool breakage and burning.

[0005] Therefore, this application provides a technical solution that makes it less likely for the cutting tool to vibrate and deform during the machining of tapered holes when using an angle head, in order to solve the problem that in the prior art, when using an angle head to machine tapered holes, the cutting tool is prone to vibration and deformation, which leads to accelerated tool wear, shortened tool life, and may even cause problems such as tool breakage and burning. Utility Model Content

[0006] The purpose of this invention is to provide a technical solution that prevents the cutting tool from vibrating and deforming during the machining of tapered holes using an angle head. This solves the problem that in the prior art, when using an angle head for tapered hole machining, the cutting tool is prone to vibration and deformation, which leads to accelerated tool wear, shortened tool life, and may even cause tool breakage or burning.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a taper drill for machining tapered holes in aluminum alloy steering knuckles, comprising: a shank and a cutting edge portion connected to the shank, wherein the cutting edge portion includes at least two cutting edges symmetrically arranged about the center line of the shank, and a chip removal groove is provided between the two cutting edges, characterized in that the cutting edge diameter increases in a stepped manner, the cutting edge diameter d1 at the end of the cutting edge away from the shank is smaller than the cutting edge diameter d2 at the end of the cutting edge closer to the shank, and the cutting edge diameter d1 is less than or equal to the minimum diameter D1 of the tapered hole.

[0008] Preferably, the length I1 of the cutting edge diameter d1 is greater than the length L1 of the minimum diameter of the tapered hole, and the length I1 of the cutting edge diameter d1 is between 8 mm and 15 mm.

[0009] Preferably, there are n equal-length dn segments with progressively increasing cutting edge diameters between the cutting edge diameters d1 and d2, and the length I2 of the cutting edge diameter dn is between 3 mm and 8 mm.

[0010] Preferably, the cutting angle between the n equally long, stepped increasing cutting edge diameters dn is between 65° and 85°.

[0011] Preferably, a through-hole is provided through the shank and the cutting edge, and a side cooling hole connected to the cooling hole is provided at the position of the chip removal groove, with the included angle between the side cooling hole and the through-hole being 30° to 60°.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows: the tapered drill for machining aluminum alloy steering knuckle tapered holes of this application reduces the contact area between the cutting edge of the tool and the workpiece when machining tapered holes using an angle head, thereby reducing cutting resistance, reducing the problem of tool vibration and deformation, and reducing tool wear and increasing tool life. Attached Figure Description

[0013] Figure 1 A schematic diagram of the conical hole of the aluminum alloy steering knuckle to be processed provided by this utility model;

[0014] Figure 2 AA is a schematic diagram of the aluminum alloy steering knuckle cone hole to be processed provided by this utility model;

[0015] Figure 3 A schematic diagram of the tapered drill structure provided by this utility model;

[0016] Legend: 100, taper drill;

[0017] 1. Handle;

[0018] 2. Cutting edge; 21. Cutting edge; 22. Chip groove;

[0019] 3. Aluminum alloy steering knuckle to be processed. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] Please see Figure 1 and Figure 2 The image shows a tapered hole in an aluminum alloy steering knuckle. It can be seen that the minimum diameter of the tapered hole is D1, the maximum diameter is D2, and the length of the portion with diameter D1 is L1. Due to clamping limitations during the actual machining of aluminum alloy steering knuckles, an angled head is used to clamp the cutting tool for machining the tapered hole. During this machining process, the angled head bearing bears excessive load, leading to increased friction and affecting machining accuracy. Simultaneously, compared to a regular taper drill bit, the clamped cutting tool has reduced torque transmission efficiency and lower rigidity, requiring it to withstand greater cutting resistance. This makes the existing cutting tool prone to vibration and deformation, resulting in accelerated tool wear, shortened tool life, and even potential tool breakage or burning. Therefore, this application provides a technical solution that reduces tool vibration and deformation during tapered hole machining using an angled head, addressing the problems of tool vibration and deformation, accelerated tool wear, shortened tool life, and potential tool breakage or burning associated with existing techniques for tapered hole machining using angled heads.

[0023] Please see Figure 3 This application provides a taper drill for machining tapered holes in aluminum alloy steering knuckles, comprising: a shank and a cutting edge portion connected to the shank. The cutting edge portion includes at least two cutting edges symmetrically arranged about the centerline of the shank, with a chip removal groove between the two cutting edges. It is understood that the cutting edges of the cutting edge portion are used for cutting, and the chip removal groove is used to remove chips produced by the cutting edges.

[0024] Specifically, the cutting edge diameter increases in a stepped manner, with the diameter d1 of the cutting edge furthest from the shank being smaller than the diameter d2 of the cutting edge closest to the shank. This stepped increase effectively reduces the contact area between the tool's tapered cutting edge and the aluminum alloy steering knuckle's tapered hole during taper machining, resulting in a more uniform distribution of cutting force and avoiding localized stress concentration. This design effectively reduces the risk of vibration and deformation during the cutting process, improving machining stability.

[0025] The cutting edge diameter d1 is set to be less than or equal to the minimum diameter D1 of the tapered hole, so that the cutting edge can machine the minimum diameter portion of the tapered hole. The length I1 of the cutting edge diameter d1 is greater than the length L1 of the minimum diameter D1 of the tapered hole, and the length I1 of the cutting edge diameter d1 is between 8 mm and 15 mm. This greater length than the length L1 of the minimum diameter D1 of the tapered hole ensures that the tool's insertion length is sufficient to machine the length L1 of the minimum diameter D1 of the tapered hole.

[0026] Furthermore, n cutting edges of equal length dn can be set between the stepped-increasing cutting edge diameters d1 and d2, with the diameters increasing in a stepped manner, thereby further effectively reducing the contact area between the tool's tapered cutting edge and the workpiece during taper machining. It can be understood that among the n stepped-increasing cutting edges dn, the cutting edge diameter closest to d1 is smaller than the cutting edge diameter closest to d2. The length I2 of the cutting edge diameter dn is between 3mm and 8mm. It can be understood that the length of the cutting edge diameter dn is determined based on the length of the aluminum alloy steering knuckle tapered hole; that is, after removing the maximum and minimum diameters of the tapered hole, the length of the n equally long cutting edge diameters dn is determined.

[0027] Furthermore, the cutting angle between the diameters dn of the n equally long, stepped cutting edges is between 65° and 85°. Specifically, by setting the cutting angle of the stepped cutting edges and further optimizing the taper of the cutting edges, the cutting resistance of the tool is reduced, the problem of tool vibration and deformation is reduced, and tool wear is reduced and tool life is increased.

[0028] Furthermore, a through-hole cooling aisle is provided through the shank and cutting edge, and a side cooling hole connected to the cooling aisle is provided at the chip removal groove location. The included angle between the side cooling hole and the through-hole cooling aisle is 30° to 60°. Specifically, the through-hole cooling aisle and the side cooling hole effectively cool the tool and the aluminum alloy steering knuckle taper hole, preventing tool burn-out or material deformation due to overheating. These improvements significantly extend tool life, reduce replacement frequency, and thus lower machining costs.

[0029] It is also understood that this application can reduce the contact area between the cutting edge of the tool and the workpiece when using an angle head to machine tapered holes, thereby reducing cutting resistance, reducing the problem of tool vibration and deformation, reducing tool wear and increasing tool life, reducing the load on the angle head bearing, extending the service life of the angle head, reducing equipment maintenance costs, and improving overall processing efficiency.

[0030] 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 other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A taper drill for machining a taper hole in an aluminum alloy knuckle, comprising: The shank and the cutting edge portion connected to the shank, wherein the cutting edge portion includes at least two cutting edges symmetrically arranged about the center line of the shank, and a chip removal groove is provided between the two cutting edges, characterized in that the cutting edge diameter increases in a stepped manner, the cutting edge diameter d1 of the cutting edge away from the shank is smaller than the cutting edge diameter d2 of the cutting edge closer to the shank, and the cutting edge diameter d1 is less than or equal to the minimum diameter D1 of the tapered hole.

2. The taper drill according to claim 1, wherein, The length I1 of the cutting edge diameter d1 is greater than the length L1 of the minimum diameter D1 of the tapered hole, and the length I1 of the cutting edge diameter d1 is between 8 mm and 15 mm.

3. The taper drill of claim 1 wherein, Between the cutting edge diameter d1 and the cutting edge diameter d2, there are n equal-length cutting edge diameters dn, with the length I2 of the cutting edge diameter dn being between 3mm and 8mm.

4. The taper drill according to claim 3, wherein, The cutting angle between n equally long, stepped, increasing cutting edge diameters dn is between 65° and 85°.

5. The taper drill according to claim 1, characterized in that, A through-hole is provided through the shank and the cutting edge, and a side cooling hole is provided at the chip removal groove position, which is connected to the cooling hole. The included angle between the side cooling hole and the through-hole is 30° to 60°.

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