CN115647410A - Asymmetric straight-blade cutter for ultrasonic cutting of honeycomb core - Google Patents

Abstract

The invention discloses an asymmetric straight-edged tool for ultrasonic cutting of honeycomb cores, which comprises a threaded fastening section, a trapezoidal clamping section and an asymmetrical knife section connected in sequence, and a threaded fastening section, a trapezoidal clamping section and an asymmetrical knife section. The axes of the knife segments are all located on the axis of the tool. The segment structure of the asymmetric knife of the present invention is a right triangle, and the cutting edge is composed of a hypotenuse cutting edge and a right angle edge cutting edge. Under the action of ultrasonic vibration, the bevel edge cutting edge can be used for "V" groove cutting in the rough machining of the honeycomb core, while the right-angle edge cutting edge can realize high-precision machining of the honeycomb core surface profile because it is parallel to the tool axis, thus Realize the "one knife with multiple functions" of the cutting tool, which improves the processing efficiency and quality. In addition, when the ultrasonic cutting tool of the present invention is used to cut the honeycomb core, the cutting force is small, the chips are removed in bands, and the dust pollution is less. Therefore, the present invention can realize high-efficiency, high-precision and high-quality green processing of honeycomb core components.

Description

An Asymmetric Straight Edge Tool for Ultrasonic Cutting of Honeycomb Cores

technical field

The invention relates to a honeycomb core processing tool, in particular to an asymmetric straight-edged tool for ultrasonic cutting of a honeycomb core.

Background technique

Compared with other structures, the closed hexagonal equilateral structure of the honeycomb core can obtain the maximum force with the least amount of material, and when the honeycomb core structure is subjected to a load perpendicular to the cell direction, its bending stiffness is comparable to that of a solid structure of the same material and thickness. The structure is almost the same, or even higher, but its weight is 70% to 90% lighter, and it is not easy to deform, crack and break, and has the advantages of shock absorption, sound insulation, heat insulation and strong weather resistance. Used in aerospace and rail transportation and other fields.

At present, the processing of honeycomb core components often adopts the high-speed milling method. By using a high-speed milling tool with a crushing blade, driven by the spindle of the machine tool, the chips of the honeycomb core are broken. However, the crushing of chips by the crushing blade will generate a large amount of processing dust, which is not friendly to the processing environment; at the same time, high-speed milling will easily cause processing defects such as deformation and tearing of honeycomb cells due to the large milling force generated during processing , thereby affecting the processing quality of the workpiece.

In recent years, in order to solve the problems of poor processing quality and dust pollution in high-speed milling, researchers have introduced ultrasonic vibration technology into the processing of honeycomb cores to achieve high-quality processing of honeycomb cores. However, the structure of the honeycomb core ultrasonic cutting tool has a great influence on the processing accuracy of the honeycomb core: the straight-edged sharp knife used in the honeycomb core ultrasonic cutting is a similar isosceles triangle structure, and the blades on both sides have a certain angle with the tool axis. When processing the contour of the curved surface, the close fit between the blade and the surface to be processed cannot be guaranteed, and high-precision processing of the contour of the honeycomb core curved surface cannot be achieved.

Contents of the invention

In order to solve the above problems, the present invention proposes an asymmetric straight-edged tool for ultrasonic cutting of honeycomb cores. The asymmetric straight-edged tool used for ultrasonic cutting of honeycomb cores can realize high-efficiency, high-precision and high-quality green processing of honeycomb core components under the action of ultrasonic vibrations, specifically: the tool is effectively reduced under the action of ultrasonic vibrations. The cutting force and friction between the honeycomb core material and the honeycomb core material reduce the processing defects of the honeycomb core material. At the same time, the beveled cutting edge of the asymmetric straight-edged tool can be used for "V" groove cutting in the rough machining of the honeycomb core, and the right-angled cutting edge of the asymmetric straight-edged tool can cut the contour of the honeycomb core surface, which not only ensures The machining accuracy of the curved surface profile is improved, and the "one knife with multiple functions" of the tool is realized, the frequency of tool change during machining is reduced, and the machining efficiency of the honeycomb core component is improved. The technical means adopted in the present invention are as follows:

An asymmetric straight-edged tool for ultrasonic cutting of honeycomb cores, comprising a threaded fastening section, a trapezoidal clamping section and an asymmetrical knife section connected in sequence, the threaded fastening section, the trapezoidal clamping section and the The axes of the asymmetric knife segments are all located on the axis of the asymmetric straight-edged tool used for ultrasonic cutting of the honeycomb core, ensuring that the ultrasonic vibration is transmitted downward along the axis of the asymmetric straight-edged tool used for ultrasonic cutting of the honeycomb core, Achieve good longitudinal vibration effect;

The structure of the asymmetric knife segment is similar to a right triangle, which ensures the stability of the tool itself. The cutting edge of the asymmetric knife segment includes a beveled edge and a right-angled edge. The beveled edge and the right-angled edge The shape of the area formed by the side cutting edges is similar to the structural shape of the asymmetric knife segment, the right-angle side cutting edge is kept parallel to the tool axis, and the beveled side cutting edge and the right-angle side cutting edge extend downward to the bottom of the knife body, so A small cutting edge is left at the bottom of the asymmetric knife segment to enhance the rigidity of the tool. The tops of the beveled cutting edge and the right-angled cutting edge are provided with arc transitions. The arc transition structure avoids stress concentration under the action of ultrasonic vibration. The service life of the tool is improved, and the trapezoidal clamping section is connected with the thread fastening section, so that the tool is fixed on the ultrasonic tool handle for ultrasonic cutting of the honeycomb core member;

The two sides of the asymmetric straight-edged tool used for ultrasonic cutting of the honeycomb core are symmetrical with respect to the neutral plane of the tool to ensure the same vibration effect on both sides of the tool under the action of ultrasonic longitudinal vibration. The asymmetrical knife segment is divided into upper body The upper blade is the area above the intersection of the bevelled cutting edge and the right-angled cutting edge. The thickness of the blade body in this area is constant, while the thickness of the lower blade below the intersection of the bevelled edge and the right-angled cutting edge decreases gradually. Small;

The wedge angle of the hypotenuse cutting edge and the right-angle cutting edge is set to β ₁ , with a size of 10° to 40°, and the wedge angle of the bottom edge of the asymmetric knife segment is set to β ₂ , with a size of 15° to 30° ;

The width of the asymmetric knife segment is designed according to the cell size of the honeycomb core, and the length of the asymmetric knife segment is greater than the depth of the required cutting honeycomb core;

The beveled cutting edge can be used for "V" groove cutting during rough machining of the honeycomb core, and the right-angled cutting edge can be used for high-precision machining of the honeycomb core curved surface profile;

The material of the asymmetric straight-edged tool used for ultrasonic cutting of the honeycomb core is high-speed steel or hard alloy, and the beveled cutting edge and the right-angled cutting edge are coated;

Compared with the prior art, the present invention has the following beneficial effects:

Realize high-precision machining of the curved surface profile of the honeycomb core component. Although the current ultrasonic machining can solve the problems of poor processing quality and dust pollution caused by high-speed milling, this method cannot achieve high-precision machining of the honeycomb core surface profile like high-speed milling. The reason: the straight edge sharp knife used in the current machining is an isosceles triangle structure, and the blades on both sides have a certain angle with the tool axis, which makes it impossible to ensure the close fit between the blade and the surface to be processed when machining the contour of the curved surface , so that high-precision machining of the contour of the honeycomb core surface cannot be achieved. However, the right-angled triangular asymmetric straight-edged tool designed by the present invention has the cutting edge on the right-angled side consistent with the axis of the tool. When machining curved surfaces, it can ensure that the cutting edge fits closely with the curved surface to be processed, and realizes the curved surface profile of the honeycomb core member. high-precision machining.

Realize high-efficiency machining of honeycomb core components. Due to the machining errors of the existing straight-edged sharp knives when machining the contour of the honeycomb core surface, the current straight-edged sharp knives are often used in the rough machining stage of the honeycomb core components, and other cutting tools are needed to realize the curved surface processing, and the processing is frequent. Tool change greatly affects the processing efficiency of honeycomb core components. The tool of the present invention adopts a right-angled triangle structure. Under the action of ultrasonic vibration, not only the beveled cutting edge can be used for "V" groove cutting during rough machining of the honeycomb core, but the right-angled cutting edge can also be used for the contour of the honeycomb core curved surface. High-precision machining, and then realize the "multi-purpose" of ultrasonic cutting tools, reduce the number of tool changes during processing, and improve processing efficiency, so the invention can realize high-efficiency processing of honeycomb core components.

Realize high-quality green processing of honeycomb core components. Although the current high-speed milling can complete the processing of each feature of the honeycomb core, the tool exerts lateral force on the honeycomb core material during processing, and the lateral stiffness of the honeycomb core material is weak, so it is easy to cause deformation and compression of the honeycomb core cells. collapse etc. In addition, high-speed milling produces dust pollution, which poses a serious threat to the health of machine operators. However, the present invention adopts a special processing method of ultrasonic cutting, which reduces the cutting force and friction between the tool and the material, and improves the processing quality of the honeycomb core member. At the same time, the present invention uses ultrasonic vibration to cut the material, and the chips are in the form of strips. Less cutting dust can realize high-quality green processing of honeycomb core components.

Based on the above reasons, the present invention can be widely promoted in the fields of processing technology and the like.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a front view of an asymmetrical straight edge cutter according to the present invention.

Fig. 2 is a cross-sectional view along line A-A of Fig. 1 .

Fig. 3 is a side view of the asymmetric straight-edged cutter of the present invention and an enlarged view of the wedge angle of the bottom cutting edge.

Fig. 4 is an equivalent processing diagram of the existing straight-edged sharp knife and the asymmetric straight-edged knife of the present invention.

Fig. 5 is a schematic diagram of "one knife with multiple functions" processing of an asymmetric straight-edged tool of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

As shown in Figure 1, an asymmetrical straight-edged tool 1 for ultrasonic cutting of honeycomb cores includes a threaded fastening section 2, a trapezoidal clamping section 3 and an asymmetrical knife section 4 connected in sequence, the threaded fastening section 2. The axes of the trapezoidal clamping section 3 and the asymmetric knife section 4 are both located on the axis of the asymmetric straight-edged tool 1 for ultrasonic cutting of honeycomb cores;

The structure of the asymmetric knife segment 4 is similar to a right triangle, and the cutting edge of the asymmetric knife segment 4 is divided into a hypotenuse cutting edge 5 and a right angle edge cutting edge 6, and the hypotenuse cutting edge 5 and the right angle edge cutting edge The shape of the area formed by 6 is similar to the structural shape of the asymmetrical knife segment 4, the beveled edge cutting edge 5 and the right-angled edge cutting edge 6 extend downward to the bottom of the blade body, and the bottom of the asymmetrical knife segment 4 has a A small section of cutting edge is used to enhance the rigidity of the tool. The upper end of the asymmetric knife segment 4 is a trapezoidal clamping section 3, and the tops of the beveled cutting edge 5 and the right-angled cutting edge 6 are provided with arc transitions. The trapezoidal clamping section 3 is connected to the lower end of the threaded fastening section 2;

The two sides of the asymmetric straight edge cutter 1 for ultrasonic cutting of honeycomb cores are symmetrical with respect to the neutral plane of the cutter to ensure that the vibration effect on both sides of the cutter is the same under the action of ultrasonic longitudinal vibration. The asymmetric cutter segment 4 is divided into Two parts, the upper blade body and the lower blade body, the upper blade body is the area above the intersection point of the bevel edge cutting edge 5 and the right angle edge cutting edge 6, the thickness of the blade body in this area is constant, and the lower blade body below the intersection point The thickness of the region gradually decreases, as shown in Figure 3;

The wedge angle of the hypotenuse cutting edge 5 and the right angle edge cutting edge 6 is set as β ₁ , and the size is 10°～40°. As shown in FIG. β ₂ , the size is 15°～30°, as shown in Figure 3;

The width of the asymmetric knife segment 4 is designed according to the cell size of the honeycomb core, and the length dimension of the asymmetric knife segment 4 is greater than the depth of the required cutting honeycomb core;

The bevel cutting edge 5 can be used for "V" groove cutting during rough machining of the honeycomb core, and the right-angle cutting edge 6 can be used for high-precision machining of the honeycomb core curved surface profile;

The material of the asymmetric straight-edged tool 1 for ultrasonic cutting of honeycomb core is high-speed steel or hard alloy, and the bevelled cutting edge 5 and the right-angled cutting edge 6 are coated;

As shown in Figure 5, since the honeycomb core ultrasonic cutting tool is a non-standard tool, it is necessary to use a flat end milling cutter for NC programming in the CAM software. At the same time, because the existing straight-edge sharp knife has a similar isosceles triangle structure, and the blades on both sides have a certain angle with the tool axis, so the tool needs to apply a forward inclination angle to the flat end milling cutter during equivalent programming, so that the tool It cannot fit closely with the surface to be processed, so there is a large residual error on the processed surface, and the residual value is as high as 0.2058mm. However, with the asymmetric straight-edged tool of the present invention, because the right-angled cutting edge is parallel to the axis of the tool, the flat-end milling cutter equivalently programmed does not need to apply a rake angle, and the tool can be kept in close contact with the curved surface to be processed, so the curved surface to be processed There is only a small overcut error caused by the principle of linear interpolation, and the overcut value is only 0.0277mm. Therefore, the invention can realize high-precision machining of the curved surface of the honeycomb core.

Under the action of ultrasonic vibration, the asymmetric straight-edged tool of the present invention can be used for "V" groove cutting during rough machining of the honeycomb core, and the right-angled cutting edge can be used for high-precision machining of the honeycomb core curved surface profile, thereby realizing The "one knife with multiple functions" of the ultrasonic cutting tool reduces the frequency of tool changes during processing and improves the processing efficiency. Therefore, the present invention can realize high-quality and efficient processing of honeycomb core components.

The foregoing embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the embodiments have described the present invention in detail, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications to the stated technical solutions, or equivalent replacement of some or even all of the technical features, and these modifications or replacements are also within the protection scope of the present invention.

Claims (5)

1. The asymmetric straight-edge cutter for ultrasonic cutting of the honeycomb core is characterized by comprising a thread fastening section, a trapezoidal clamping section and an asymmetric cutter segment which are sequentially connected, wherein the axes of the thread fastening section, the trapezoidal clamping section and the asymmetric cutter segment are all positioned on the axis of the asymmetric straight-edge cutter for ultrasonic cutting of the honeycomb core;

the structure of the asymmetric blade section is similar to that of a right triangle, the cutting edges of the asymmetric blade section comprise a bevel edge cutting edge and a right-angle edge cutting edge, the shape of an area formed by the bevel edge cutting edge and the right-angle edge cutting edge is similar to that of the structure of the asymmetric blade section, the right-angle edge cutting edge is parallel to the axis of the cutter, the bevel edge cutting edge and the right-angle edge cutting edge extend downwards to the bottom of the cutter body, a small section of cutting edge is reserved at the bottom of the asymmetric blade section to enhance the rigidity of the cutter, the upper end of the asymmetric blade section is a trapezoidal clamping section, the tops of the bevel edge cutting edge and the right-angle edge cutting edge are provided with rounded corner transitions, and the trapezoidal clamping section is connected with the threaded fastening section;

the two sides of the asymmetric straight-edge cutter for honeycomb core ultrasonic cutting are symmetric about a neutral plane of the cutter, the asymmetric cutter segment is divided into an upper cutter body and a lower cutter body, the upper cutter body is an area above the intersection point of a bevel edge cutting edge and a right-angle edge cutting edge, the thickness of the cutter body in the area is constant, and the thickness of the area of the lower cutter body below the intersection point of the bevel edge cutting edge and the right-angle edge cutting edge is gradually reduced.

2. The asymmetric straight edge tool for ultrasonic cutting of honeycomb cores as claimed in claim 1, wherein the wedge angles of the bevel edge cutting edge and the right-angle edge cutting edge are kept consistent and have a size of 10-40 °, and the wedge angle of the bottom edge of the asymmetric blade section is 15-30 °.

3. The asymmetric straight edge tool for ultrasonic cutting of honeycomb core of claim 1 wherein the width of said asymmetric blade segment is designed according to the dimension of honeycomb core blank space, and the length dimension of said asymmetric blade segment is larger than the depth of honeycomb core to be cut.

4. The asymmetric straight-edge cutting tool for ultrasonic cutting of the honeycomb core as claimed in claim 1, wherein the bevel edge cutting edge can be used for cutting a V-shaped groove during rough machining of the honeycomb core, and the right-angle edge cutting edge can be used for high-precision machining of a curved surface profile of the honeycomb core.

5. The asymmetric straight-edged tool for ultrasonic cutting of honeycomb cores as claimed in claim 1, wherein the material of the asymmetric straight-edged tool for ultrasonic cutting of honeycomb cores is high-speed steel or cemented carbide, and the bevel edge cutting edge and the square edge cutting edge are subjected to coating treatment.

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