A trajectory planning method for ultrasonic sharp-edged cutting blades for aramid paper honeycomb cores

Abstract

The present invention discloses a method for planning the trajectory of an ultrasonic sharp-edged cutting tool for an aramid paper honeycomb core. The method performs specific cutting trajectory planning on the ultrasonic sharp-edged cutting tool, so that the sharp-edged cutting tool performs "V-shaped" large-allowance rough processing and cutting on the raw material layer by layer, without the use of a disc cutter, thereby reducing tool costs and saving tool change time. Moreover, the distance between the cutting tool paths is not limited by the diameter of the disc cutter, the distance between the cutting tool paths is large, the required tool path trajectories are fewer, and the cutting efficiency is higher. When planning the CNC milling motion trajectory of the sharp-edged cutting tool, the raw material is divided into multiple layers along the thickness direction for cutting, and each layer of the raw material is cut by multiple "V-shaped" tool path trajectories. The "V-shaped" tool path trajectory is formed by two adjacent ultrasonic sharp-edged cuttings. The method can not only achieve the maximum cutting depth of the sharp-edged cutting tool, but also ensure that the cutting depth does not exceed the length of the sharp-edged cutting tool, thereby avoiding the tool handle from damaging the surface of the unprocessed raw material.

Description

Technical Field

[0001] The patent of this invention belongs to the field of composite material manufacturing technology, and specifically relates to a method for planning the trajectory of an ultrasonic sharp-edged cutting knife for an aramid paper honeycomb core. Background Art

[0002] Aramid paper honeycomb cores are widely used in the aerospace manufacturing field due to their high specific strength, high specific stiffness, fatigue resistance, corrosion resistance and many other excellent properties. This material is often processed using ultrasonic milling machines. The ultrasonic milling machine is equipped with a sharp-edged cutter that can cut the aramid paper honeycomb core like a dagger. In the past, when ultrasonic CNC milling machines were used for rough processing of raw materials, the raw materials were first cut with a cutter to form a triangular residue, and then the triangular residue was cut with a disc knife. The rough processing of a raw material required multiple combined cuttings of the aforementioned cutter and disc knife. This method required multiple tool changes, and the cutting width of the cutter was limited by the diameter of the disc knife and could not be too large. The cutting track of the cutter was dense, which affected the processing efficiency. It is now necessary to design and invent a method for planning the trajectory of an ultrasonic sharp-edged cutter for an aramid paper honeycomb core, plan a specific cutting trajectory for the sharp-edged cutter, and only use the sharp-edged cutter to perform "V-shaped" large-residue cutting on the raw material layer by layer. There is no need to use a disc knife, thereby avoiding tool change, improving processing efficiency, and reducing tool costs. In addition, it is necessary to reasonably plan the tool cutting trajectory, which can maximize the use of the tool length and ensure that the cutting depth does not exceed the length of the sharp-edged cutter, avoiding the tool handle from damaging the unprocessed raw material surface, thereby achieving the purpose of efficiently removing the raw material residue. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a method for planning the trajectory of an ultrasonic sharp-edged cutter for an aramid paper honeycomb core.

[0004] This invention patent is realized through the following technical solutions:

[0005] A method for planning the trajectory of an ultrasonic sharp-edged cutting knife for an aramid paper honeycomb core comprises the following steps:

[0006] Step 1: Clamp the raw material. Prepare the aramid paper honeycomb core raw material to be milled and clamp it on the fixture.

[0007] Step 2: Set tool parameters and compile machining program;

[0008] First, set the tip cutting blade rake angle to α, the tool side rake angle to β, showing a "V-shaped" trajectory, the actual length of the tool is L, calculate the actual effective cutting length of the tool

[0009]

[0010] Based on Calculate the distance between layers along the thickness of the material , the distance between two adjacent "V-shaped" tool paths

[0011]

[0012]

[0013] Finally, according to the above tool setting parameters, the theoretical model of the aramid paper honeycomb core, the tool's front rake angle α, the tool's side rake angle β, 、 Determine the tool processing path and number of processing layers, and compile the tool trajectory processing program.

[0014] Step 3: Perform multi-layer cutting: Run the tool path processing program in the CNC machine tool to perform multi-layer cutting of the rough material. After each layer of cutting is completed, the processing program is paused. The operator manually removes the cut rough material and continues to run the processing program. Repeat the above steps until the milling process reaches the required rough material depth and the milling is completed.

[0015] Preferably, the value range of α is 20°~40°, the value range of β is 20°~40°, and the value range of L is 30mm~60mm.

[0016] The beneficial effects of the present invention are:

[0017] The present invention plans a specific cutting trajectory for the sharp-edged cutting knife, allowing the sharp-edged cutting knife to perform "V-shaped" large-residue rough machining on the raw material layer by layer, eliminating the need for a disc cutter, reducing tool costs and saving tool change time. The distance between the cutting knife paths is not limited by the diameter of the disc cutter, and the distance between the cutting knife paths is large, the tool path trajectories are fewer, and the cutting efficiency is higher. The preferred solution proposed by the present invention optimizes the tool inclination angle and the entry position of adjacent layers, which can maximize the use of the tool length, ensure that the cutting depth does not exceed the length L of the sharp-edged cutting knife, and avoid the tool handle from damaging the surface of the unprocessed raw material, thereby achieving the purpose of efficiently removing the raw material excess. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the hair removal process.

[0019] Figure 2 Schematic diagram of the “V-shaped” cutting section.

[0020] Figure 3 Schematic diagram of the actual effective cutting length of the tool.

[0021] Explanation of the numbers in the figure: 1-raw material, 2-sharp-edged cutting knife, 3-cut raw material, 4-clamp DETAILED DESCRIPTION

[0022] Step 1: If Figure 1 As shown, the aramid paper honeycomb core material 1 to be milled is prepared and clamped on a fixture 4.

[0023] Step 2: Set tool parameters and compile machining program

[0024] As a preferred embodiment, the actual length L of the sharp-edged cutting knife 2 is selected to be 55 mm, the forward inclination angle α of the sharp-edged cutting knife 2 is selected to be 30°, and the tool side inclination angle β is selected to be 30°.

[0025] according to Figure 3 , the following can be derived to calculate the actual effective cutting length of the tool The formula, Figure 3 AK is the actual length L of the sharp-edged cutting tool, and AO is the actual effective cutting length of the tool. , ∠HAO is the tool lateral inclination angle β, ∠HAK is the forward direction inclination angle α:

[0026]

[0027] Substitute L, α, and β:

[0028] =

[0029] according to Figure 2 , the following can be derived to calculate the distance between layers in the thickness direction of the wool material: formula, Figure 2 ∠AOC, ∠ADE - tool lateral inclination angle β, AO - tool actual effective cutting length

[0030]

[0031] Bring in , β:

[0032]

[0033] according to Figure 2 , the following can be derived to calculate the distance between layers in the thickness direction of the wool material: formula

[0034]

[0035] =

[0036] =3

[0037] Bring in , β:

[0038]

[0039] According to the above tool setting parameters, in the CAD software, according to the theoretical model of the aramid paper honeycomb core, the tool's front rake angle α, the tool's side rake angle β, 、 Determine the tool processing path and number of processing layers, and compile the tool trajectory processing program.

[0040] Step 3: Perform multi-layer cutting

[0041] like Figure 1 As shown, the tool path processing program is run in the CNC machine tool to perform multi-layer cutting of the rough material 1. After each layer of cutting is completed, the processing program is paused. The operator manually removes the cut rough material 3 and continues to run the processing program. The above steps are repeated until the milling process reaches the required rough material depth and the milling is completed.

[0042] The implementation process of the above solution significantly improves efficiency compared to traditional rough machining solutions and also reduces tool costs.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for planning the trajectory of an ultrasonic sharp-edged cutting knife for an aramid paper honeycomb core, characterized in that The following steps are involved: Step 1: clamping the raw material; Step 2: Set tool parameters and compile machining program; Set the tip cutting blade rake angle to α, the tool side rake angle to β, showing a "V-shaped" trajectory, the actual length of the tool is L, calculate the actual effective cutting length of the tool L3 L3=L×cosα×cosβ According to L3, calculate the distance L1 between layers along the thickness direction of the raw material and the distance L2 between two adjacent "V-shaped" tool paths L2=3×L3×sinβ According to the above tool setting parameters, the tool processing path and the number of processing layers are determined in the CAD software based on the theoretical model of the aramid paper honeycomb core, the tool's forward tilt angle α, the tool's side tilt angle β, L1, and L2, and the tool trajectory processing program is compiled; Step 3: multi-layer cutting; Run the tool path processing program in the CNC machine tool to perform multi-layer cutting of the rough material. After each layer of cutting is completed, the processing program is paused. The operator manually removes the cut rough material and continues to run the processing program. Repeat the above steps until the milling process reaches the required rough material depth and the milling is completed.

2. The method for planning the trajectory of an ultrasonic sharp-edged cutting tool for an aramid paper honeycomb core according to claim 1, characterized in that The specific process of step 1 is as follows: preparing the aramid paper honeycomb core wool to be milled and clamping it on a fixture.

3. The method for planning the trajectory of an ultrasonic sharp-edged cutting tool for an aramid paper honeycomb core according to claim 1, characterized in that: The value range of α is 20°~40°, the value range of β is 20°~40°, and the value range of L is 30mm~60mm.

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