Design method of dagger knife

Abstract

According to the dagger cutter design method, the mass of the dagger cutter is reduced by forming a cavity in a handle part, the dagger cutter can be precisely designed according to the design mass, whether the dagger cutters of the same batch or different batches are used, the high consistency of the quality can be guaranteed, vibration parameters of a machine tool do not need to be adjusted again when the dagger cutters are replaced, and the dagger cutter design efficiency is improved. In actual use, if a certain dagger cutter is damaged, the dagger cutter with the same design quality determined by the method is used for directly replacing the dagger cutter, the situation that machining parameters are readjusted due to the fact that the quality of each cutter is different like a traditional cutter is not needed, the interchangeability of the cutter is improved, and the machining quality of the dagger cutter is improved. And the machining parameter debugging time is saved, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of cutting tools for processing honeycomb materials, and in particular to a design method for a dagger. Background Technology

[0002] In the field of honeycomb material processing, the dagger knife is a widely used tool. When combined with ultrasonic-assisted processing methods, it not only improves the tool life but also enhances the processing quality of honeycomb materials.

[0003] When machining daggers, ultrasonic machining tools are typically used to achieve cutting using high-frequency vibration. Because ultrasonic vibration machining places certain demands on the quality of the cutting tool, current daggers mainly have two structures: one is a one-piece high-speed steel blade, and the other is a carbide blade welded to a high-speed steel shank. While one-piece high-speed steel daggers are lighter, high-speed steel lacks wear resistance, resulting in a shorter lifespan. Carbide blades welded to a high-speed steel shank, while improving tool life, require sophisticated welding processes, and the uneven mass distribution between the cutting part and the shank leads to uneven stress distribution during high-frequency vibration, accelerating tool wear and causing chipping of the cutting edge. These two types of blades cannot be directly interchanged under the same vibration parameters due to their different masses; the vibration parameters must be readjusted according to the mass of each blade, reducing production efficiency and increasing production costs.

[0004] Therefore, how to reduce the need to readjust vibration parameters when replacing tools and improve production efficiency are urgent technical problems that need to be solved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a design method for a dagger that reduces the need to readjust vibration parameters when replacing tools and improves production efficiency.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A method for designing a dagger includes the following steps: S1. Construct an initial three-dimensional model of the dagger based on its initial dimensions and material density, and determine the initial mass M1 of the dagger; S2. Calculate the removal volume Vr of the cavity in the dagger handle based on the initial mass M1 and the target mass M of the dagger. S3. Determine the cavity size and the mass M2 after removal of the dagger based on the cavity type and the removal volume Vr. S4. Determine whether the removed mass M2 is equal to the target mass M. If so, process the dagger according to the cavity size; otherwise, proceed to step S3.

[0007] As a further improvement to the above technical solution: In step S2, Vr = , where ρ is the material density.

[0008] In step S3, the cavity is a cylindrical cavity and satisfies:

[0009] In the above formula, , A < L - L1, D1 + 4 < H2, n ≥ 1, n is the number of cavity types with different diameters, Ai is the depth of the i-th cylindrical cavity, Di is the diameter of the i-th cylindrical cavity, A is the total depth of all cylindrical cavities, L is the total depth of the dagger knife, L1 is the length of the straight edge of the dagger knife, D1 is the maximum diameter of the cavity, and H2 is the minimum diameter of the outer circle of the dagger knife handle.

[0010] In step S3, 3 ≥ n ≥ 1.

[0011] In step S3, when n = 1 and the cavity type is a single cylindrical cavity, it satisfies:

[0012] In the above formula, D1 + 4 < H2, A is the depth of the single cylindrical cavity, D1 is the diameter of the single cylindrical cavity, and H2 is the minimum diameter of the outer circle of the dagger knife handle.

[0013] In step S3, when n = 2 and the cavity type is a double-cylindrical stepped cavity, the double-cylindrical stepped cavity includes a large cylindrical cavity and a small cylindrical cavity and satisfies:

[0014] In the above formula, D2 > D1, D1 + 4 < H2, D2 is the diameter of the large cylindrical cavity, D1 is the diameter of the small cylindrical cavity, A1 is the depth of the small cylindrical cavity, A2 is the depth of the large cylindrical cavity, and H2 is the minimum diameter of the outer circle of the dagger knife handle.

[0015] In step S3, when n = 3 and the cavity type is a triple-cylindrical stepped cavity, the triple-cylindrical stepped cavity includes a large cylindrical cavity, a medium cylindrical cavity, and a small cylindrical cavity and satisfies:

[0016] In the above formula, D3 > D2 > D1, D1 + 4 < H2, D3 is the diameter of the large cylindrical cavity, A3 is the depth of the large cylindrical cavity, D2 is the diameter of the medium cylindrical cavity, A2 is the depth of the large cylindrical cavity, D1 is the diameter of the small cylindrical cavity, A1 is the depth of the small cylindrical cavity, and H2 is the minimum diameter of the outer circle of the handle.

[0017] In step S1, an initial three-dimensional model of the dagger knife is constructed based on three-dimensional modeling software.

[0018] In step S2, the cavity of the handle is connected to the outside and is used for weight reduction.

[0019] In step S4, the cutting part and the handle of the dagger are integrally formed.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: The design method of this invention for a dagger reduces the mass of the dagger by creating a cavity in the handle. This allows for precise design of the dagger based on its designed mass, ensuring high consistency in quality regardless of whether the daggers are from the same or different batches. When replacing a dagger, there is no need to readjust the machine tool's vibration parameters, improving production efficiency and meeting machine tool requirements. In actual use, if a dagger is damaged, it can be directly replaced with a dagger of the same designed mass determined by this invention, eliminating the need to readjust machining parameters due to differences in the mass of each traditional dagger. This not only increases the interchangeability of daggers but also saves time on machining parameter adjustments, thereby improving production efficiency. Attached Figure Description

[0021] Figure 1 This is a flowchart of the design method of the present invention.

[0022] Figure 2 This is a front view schematic diagram of a dagger according to an embodiment of the present invention.

[0023] Figure 3 This is a schematic end view of a dagger according to Embodiment 1 of the present invention.

[0024] Figure 4 yes Figure 2 Schematic diagram of the cross section of the straight-edged PP blade.

[0025] Figure 5 This is a cross-sectional view of the handle of the dagger in Example 1.

[0026] Figure 6 This is a cross-sectional view of the handle of the dagger in Example 2.

[0027] Figure 7 This is a cross-sectional view of the handle of the dagger in Example 3.

[0028] The labels in the diagram represent: 1. Cutting part; 2. Shank; 3. Cavity. Detailed Implementation

[0029] The present invention will be further described in detail below. Unless otherwise specified, the instruments or materials used in the present invention are commercially available.

[0030] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc., 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 invention 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 invention.

[0031] 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 invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," 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 invention according to the specific circumstances.

[0033] Example 1: Figures 2-5 An embodiment of the dagger of the present invention is shown. The dagger includes a cutting part 1 and a handle 2. The cutting part 1 is a thin sheet structure with a straight blade, and the handle 2 is a column. The cutting part 1 and the handle 2 are integral structures, which can avoid the risk of breakage of traditional welded knives. The material is cemented carbide, which can keep the knife with a long service life. The cutting part 1 is provided with a straight cutting edge, and the handle 2 is provided with a cavity 3 at the center. The handle 2 includes a connecting section, a threaded section and a concave section. The concave section is located between the connecting section and the threaded section. The connecting section is located on the side closer to the cutting part 1, and the thread is located on the side away from the cutting part 1.

[0034] In order to make the volume of cavity 3 evenly distributed in handle 2 and to maintain good balance of the dagger, cavity 3 is set as a cylinder, and the dagger is symmetrical about its axis.

[0035] The thickness B of the straight cutting edge of cutting part 1 satisfies: 0.1H1≤B≤0.25H1, the clearance angle α of the straight cutting edge satisfies: 10°≤α≤20°, the length L1 of the straight cutting edge and the maximum outer diameter H1 of the shank 2 are both not equal to 0, and 1≤ ≤3, H2<H3 ​

[0036] By adjusting the size of cavity 3, different batches of cutting tools can have the same quality, which not only increases the interchangeability of daggers, but also saves the time of readjusting the vibration parameters of machine tools due to different tool weights, thus improving processing efficiency.

[0037] like Figure 1 As shown, a dagger design method according to this embodiment includes the following steps: S1. Construct an initial three-dimensional model of the dagger based on its initial dimensions and material density, and determine the initial mass M1 of the dagger. S2. Based on the initial mass M1 and target mass M of the dagger, calculate the removal volume Vr of the cavity 3 of the dagger handle 2; S3. Determine the size of the cavity 3 and the mass M2 after removal based on the type of cavity 3 and the removal volume Vr. S4. Determine whether the removed mass M2 is equal to the target mass M. If so, process the dagger according to the cavity 3 dimensions; otherwise, proceed to step S3.

[0038] The design method of this invention for a dagger reduces the mass of the dagger by setting a cavity 3 in the handle 2. This allows for precise design of the dagger according to the designed mass, ensuring high consistency in quality regardless of whether the daggers are from the same batch or different batches. When replacing a dagger, there is no need to readjust the machine tool's vibration parameters, improving production efficiency and meeting machine tool requirements. In actual use, if a dagger is damaged, it can be directly replaced with a dagger of the same designed mass determined by this invention, eliminating the need to readjust processing parameters due to differences in the mass of each traditional dagger. This not only increases the interchangeability of daggers but also saves time on processing parameter debugging, thereby improving production efficiency.

[0039] In step S2, Vr = ρ is the material density.

[0040] In step S3, cavity 3 is a cylindrical cavity that satisfies:

[0041] In the above formula, A < L - L1, D1 + 4 < H2, n ≥ 1, n is the number of different types of cavities 3 with different diameters, Ai is the depth of the i-th cylindrical cavity, Di is the diameter of the i-th cylindrical cavity, A is the total depth of all cylindrical cavities, L is the total depth of the dagger, L1 is the straight blade length of the dagger, D1 is the diameter of the largest cylindrical cavity, and H2 is the minimum diameter of the outer circle of the dagger handle 2 (in this embodiment, it is the concave circle diameter).

[0042] In this embodiment, in step S1, the density ρ is input into the 3D modeling software, and the mass M1 of the initial 3D model is calculated using the volume measurement function of the UG / NX software.

[0043] In this embodiment, in step S2, the solid part of the cavity 2 of the initial three-dimensional model of the dagger is removed using UG / NX software, which makes it easier to determine later whether the mass M2 of the dagger is equal to the target mass M.

[0044] In this embodiment, L=60mm, L1=38mm, H1=14.5mm, H2=5.6mm, H3=15.1mm, B=1.6mm, and ρ=14.1g / cm³. 3 , α=16°, M=20g, M1=25g.

[0045] The final dimensions of cavity 3 are: A=18mm, D1=5mm.

[0046] Example 2: Figure 6 The dagger shown in Embodiment 2 is largely the same as that in Embodiment 1, except that: in this embodiment, the cavity 3 of the dagger is composed of two cylindrical cavities with different outer diameters. The smaller cylindrical cavity is located in the concave circular section and the threaded section of the handle 2, and the larger cylindrical cavity is located in the connecting section of the handle 2.

[0047] The design method of the dagger in this embodiment is largely the same as that in Embodiment 1, except that n=2.

[0048] The final dimensions of cavity 3 are: A=15mm, A1=12mm, D1=4mm, D2=9.2mm.

[0049] Example 3: Figure 7 The dagger shown in Embodiment 2 is largely the same as that in Embodiment 1, except that: in this embodiment, the cavity 3 of the dagger is composed of three cylindrical cavities with different outer diameters. The large cylindrical cavity is located in the connecting section, the small cylindrical cavity is located in the concave section, and the medium cylindrical cavity is located in the threaded section.

[0050] The design method of the dagger in this embodiment is largely the same as that in Embodiment 1, except that n=3.

[0051] The final dimensions of cavity 3 are: A=17mm, A1=6mm, D1=3mm, A2=8mm, D2=4mm, D3=9.72mm.

[0052] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A design method for a dagger, characterized in that: Includes the following steps: S1. Construct an initial three-dimensional model of the dagger based on its initial dimensions and material density, and determine the initial mass M1 of the dagger. S2. Calculate the removal volume Vr of the cavity in the dagger handle based on the initial mass M1 and the target mass M of the dagger. S3. Determine the cavity size and the mass M2 after removal of the dagger based on the cavity type and the removal volume Vr. S4. Determine whether the mass M2 after the dagger is removed is equal to the target mass M. If so, process the dagger according to the cavity size; otherwise, proceed to step S3.

2. The design method of the dagger according to claim 1, characterized in that: In step S2, Vr = ρ is the material density.

3. The design method of the dagger according to claim 1, characterized in that: In step S3, the cavity is a cylindrical cavity, satisfying: In the above formula, A < L - L1, D1 + 4 < H2, n ≥ 1, n is the number of cavity types with different diameters, Ai is the depth of the i-th cylindrical cavity, Di is the diameter of the i-th cylindrical cavity, A is the total depth of all cylindrical cavities, L is the total depth of the dagger, L1 is the straight blade length of the dagger, D1 is the diameter of the largest cylindrical cavity, and H2 is the minimum diameter of the outer circle of the dagger handle.

4. The design method of the dagger according to claim 3, characterized in that: In step S3, 3 ≥ n ≥ 1.

5. The design method of the dagger according to claim 4, characterized in that: In step S3, when n=1, and the cavity type is a single cylindrical cavity, the following condition is met: In the above formula, D1+4D1, D1+4D2>D1, D1+4<H2, D3 is the diameter of the large cylinder cavity, A3 is the depth of the large cylinder cavity, D2 is the diameter of the medium cylinder cavity, A2 is the depth of the large cylinder cavity, D1 is the diameter of the small cylinder cavity, A1 is the depth of the small cylinder cavity, and H2 is the minimum diameter of the outer circle of the handle.

6. The design method of the dagger according to claim 4, characterized in that: In step S1, an initial 3D model of the dagger is constructed using 3D modeling software. In step S2, the cavity of the handle is connected to the outside and is used for weight reduction.

7. The design method of the dagger according to claim 4, characterized in that: In step S4, the cutting part and the handle of the dagger are integrally formed. ​ 8. The design method of the dagger according to any one of claims 1 to 7, characterized in that: ​ 9. The design method of the dagger according to any one of claims 1 to 7, characterized in that: ​ 10. The design method of the dagger according to claim 9, characterized in that: ​

Images