CN220218732U - Ultrasonic straight blade knife - Google Patents

Abstract

The utility model discloses an ultrasonic straight blade knife which comprises a variable amplitude rod, a knife holder and a straight blade body, wherein the first end of the knife holder is fixedly connected to the joint of the variable amplitude rod, the straight blade body comprises a knife body substrate, a knife web, side blades and a knife tip, the first end of the knife body substrate is connected to the second end of the knife holder through welding flux, the knife web and the side blades are connected to the second end of the knife body substrate, the side blades are symmetrically arranged at the two sides of the knife web, the thickness of the knife web and the thickness of the side blades are gradually reduced from one end connected with the knife body substrate to one end far away from the knife body substrate, and the knife tip is arranged at the joint of the ends of the side blades at the two sides of the knife web. The ultrasonic straight blade knife for processing the aerospace aramid honeycomb material in an ultrasonic-assisted manner can effectively improve the processing quality of the aerospace aramid honeycomb material.

Description

Ultrasonic straight blade knife

Technical Field

The utility model relates to the field of ultrasonic machining, in particular to a mechanical machining ultrasonic cutting straight-edge knife tool for an aramid paper honeycomb core material.

Background

The quality of the aircraft in the aerospace field is always an important condition for determining the quality of the aircraft, the research of lightweight materials is one of the most active research directions in the field of aircraft materials in the world, and the aramid paper honeycomb materials are outstanding in achievement. The aramid paper honeycomb is an extremely special material, has the characteristics of high specific strength and specific rigidity, low deformation, high temperature resistance, chemical corrosion resistance, flame retardance, excellent electrical insulation performance and the like, and is widely applied to the field of aerospace at present. The aramid paper honeycomb material is a porous honeycomb structure fiber material, so that the anisotropic property is particularly obvious, the aramid paper honeycomb material can bear large stress in the axial direction of a honeycomb core lattice and has high rigidity and strength, and the aramid paper honeycomb material can only bear small stress in the radial direction of the honeycomb core lattice and is extremely easy to deform.

When the traditional high-speed milling processing mode is used for processing the honeycomb workpiece, a series of problems such as blockage processing, tearing of the honeycomb workpiece, burrs of the workpiece, appearance defects and the like of a scrap fiber winding cutter produced by processing easily occur.

The foregoing background is only for the purpose of facilitating an understanding of the principles and concepts of the utility model and is not necessarily in the prior art to the present application and is not intended to be used as an admission that such background is not entitled to antedate such novelty and creativity by the present application without undue evidence prior to the present application.

Disclosure of Invention

In order to solve the technical problems, the utility model provides an ultrasonic straight blade knife for ultrasonic-assisted processing of an aerospace aramid honeycomb material, which can effectively improve the processing quality of the aerospace aramid honeycomb material.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model discloses an ultrasonic straight blade knife which comprises a variable amplitude rod, a knife holder and a straight blade body, wherein the first end of the knife holder is fixedly connected to the joint of the variable amplitude rod, the straight blade body comprises a knife body substrate, a knife web, side blades and a knife tip, the first end of the knife body substrate is connected to the second end of the knife holder through welding flux, the knife web and the side blades are connected to the second end of the knife body substrate, the side blades are symmetrically arranged at the two sides of the knife web, the thickness of the knife web and the thickness of the side blades are gradually reduced from one end connected with the knife body substrate to one end far away from the knife body substrate, and the knife tip is arranged at the joint of the ends of the side blades at the two sides of the knife web.

Preferably, the first end of the tool apron is provided with an external thread part and a guide column part, the guide column part is connected with the second end of the external thread part, the interface end of the amplitude transformer is provided with an internal thread part and a guide groove part, the guide groove part is arranged at the external port of the internal thread part, the external thread part and the internal thread part are mutually matched, the guide column part and the guide groove part are correspondingly arranged, and the surface roughness of the guide column part and the guide groove part is not more than Ra0.8.

Preferably, the guide post portion and the guide groove portion are respectively tapered.

Preferably, the external thread part adopts a smaller pitch than a standard coarse thread on the basis of a predetermined large diameter, and the small diameter d=d-p× 1.0825 of the external thread part, wherein D is the large diameter of the external thread part, the value range of D is 7.8 mm-8.2 mm, P is the pitch of the external thread part, and the value range of P is 1.058 mm-1.33 mm.

Preferably, a clearance groove is formed at one end of the external thread part, which is close to the guide post part, and chamfers are respectively arranged between the clearance groove and the external thread part and between the clearance groove and the guide post part.

Preferably, a clamping part is arranged at the second end of the tool apron, a welding groove is formed in the middle of the clamping part, and the first end of the tool body substrate is connected in the welding groove through welding by welding.

Preferably, a chamfer is arranged between the cutter body base body and the side cutter edge, and the dimension of the chamfer is 1/2 of the thickness of the cutter body base body.

Preferably, the angle of the side blade is 25 ° to 30 °.

Preferably, the knife tip is provided with a knife edge perpendicular to the axial direction of the amplitude transformer.

Preferably, the thickness of the solder between the first end of the cutter body base and the second end of the cutter seat is 0.01 mm-0.1 mm.

Compared with the prior art, the utility model has the beneficial effects that: according to the ultrasonic straight blade knife provided by the utility model, the side blade and the knife web of the straight blade knife body are thinner from the root to the tip, so that the strength of the root of the straight blade knife body is improved, ultrasonic energy can be better transmitted, the side pressure on the aerospace aramid paper honeycomb material is smaller, the stability is high, and the processing quality of the aerospace aramid honeycomb material can be effectively improved.

In a further scheme, the utility model has the following beneficial effects:

(1) The external screw thread portion of blade holder is close to the one end of guide post portion and is equipped with the tool withdrawal groove, should withdraw and all set up the circular arc transition between tool withdrawal groove and external screw thread portion and the guide portion department, can reduce the stress concentration of cutter itself, improves cutter life-span.

(2) The external thread part of the tool apron adopts a smaller thread pitch compared with a standard coarse thread on the basis of a preset large diameter so as to improve the connection strength between the tool apron and the amplitude transformer, improve the fatigue resistance and ensure the ultrasonic transmission contact area.

(3) When the guide post part of the tool apron and the guide groove of the amplitude transformer respectively adopt conical structures, the tool apron is positioned more accurately when being arranged on the amplitude transformer, the contact surface is larger, the fitting degree of the two conical surfaces can be improved along with the improvement of the pretightening force of the screw threads, and the small deformation of the conical surfaces can also repair the errors of the conical surfaces generated by machining.

Drawings

Fig. 1 is a schematic structural view of an ultrasonic straight blade knife according to an embodiment of the present utility model;

FIG. 2 is an exploded schematic view of the ultrasonic straight edge blade of FIG. 1;

FIG. 3 is a schematic view of the installation of the ultrasonic straight blade of FIG. 1;

FIG. 4 is a schematic view of the straight edge cutter body of the ultrasonic straight edge cutter of FIG. 1;

FIG. 5 is a side view of the straight edge cutter body of FIG. 4;

FIG. 6 is a schematic cross-sectional view of F-F in FIG. 5;

FIG. 7 is a schematic view of the tool holder of the ultrasonic straight blade tool of FIG. 1;

FIG. 8 is a schematic view of the external threaded portion of the tool holder of FIG. 7;

FIG. 9 is a schematic view of the structure of the solder of the ultrasonic straight blade of FIG. 1;

FIG. 10 is a schematic thickness illustration of the solder of FIG. 9;

FIG. 11 is a schematic view of the horn of the ultrasonic straight blade of FIG. 1;

fig. 12 is a schematic structural view of an ultrasonic straight blade knife according to a second embodiment of the present utility model;

FIG. 13 is a schematic view of the configuration of the seat of the ultrasonic straight blade of FIG. 12;

fig. 14 is a schematic structural view of an ultrasonic straight blade knife according to a third embodiment of the present utility model;

fig. 15 is a schematic view of the structure of the holder of the ultrasonic straight blade of fig. 14.

Detailed Description

The following describes embodiments of the present utility model in detail. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the utility model or its applications.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for both the fixing action and the circuit/signal communication action.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing embodiments of the utility model and to simplify the description by referring to the figures, rather than to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In order to solve a series of problems existing in the traditional high-speed milling method for processing the aramid paper honeycomb material, the utility model provides a solution of ultrasonic auxiliary processing, and the basic principle of the technology is that ultrasonic frequency vibration is applied to a cutting tool of the honeycomb core material along the axial direction, so that the internal molecular structure of the aramid paper honeycomb core material can be easily damaged on the cutting tool to achieve the purpose of cutting.

The ultrasonic cutting scheme is divided into two types according to the condition that an ultrasonic assembly and a cutting tool are integrated, wherein one type is that an ultrasonic amplitude transformer is directly processed into a blade shape, and the other type is that the amplitude transformer is separated from the cutting tool. Because the cutter is a lost article, the cutter needs to be frequently disassembled and replaced, and therefore, a separated design of the amplitude transformer and the cutter is generally adopted. In the split design, the amplitude transformer is in threaded connection, and the size of threads is limited, so that the strength of threads at the joint is insufficient, and the cutter threaded connection is easy to shake off or the threads fail due to disassembly.

The cutter with the separated amplitude transformer and the cutter is divided into an integrated cutter and a separated cutter according to the condition that the blade and the cutter holder are integrated. The cutting tool is difficult to avoid abrasion even if a metal material with higher hardness is adopted because the cutting tool needs to bear high-frequency vibration, the manufacturing cost of the hard alloy tool with the integrated tool holder and the integrated blade is too high, and the problems of heating and energy loss caused by poor contact due to improper connection mode of the tool holder and the blade are easily generated. And the shape of the blade has overlarge non-blade pressure on the honeycomb material, so that the phenomenon of collapse after the honeycomb material is cut is easy to occur.

Based on the problems, the utility model designs a novel ultrasonic straight blade knife to improve the threaded connection strength, ensure that ultrasonic waves are stably conveyed to a working end, reduce the cutting force, increase the cutting depth, improve the processing surface quality of an aramid honeycomb material and reduce the processing cost.

Referring to fig. 1 and fig. 2, an ultrasonic straight blade knife according to an embodiment of the present utility model includes an amplitude transformer 4, a knife holder 1 and a straight blade knife body 3, wherein a first end of the knife holder 1 is fixedly connected to an interface of the amplitude transformer 4, and in combination with fig. 3, the straight blade knife body 3 is welded to a second end of the knife holder 1 by solder 2.

Referring to fig. 4, the straight blade body 3 includes a body base 3-1, side blades 3-3, a web 3-5 and a blade tip 3-4, the first end of the body base 3-1 is connected to the second end of the blade holder 1 by solder 2, the side blades 3-3 and the web 3-5 are connected to the second end of the body base 3-1, the side blades 3-3 are symmetrically disposed at two sides of the web 3-5, the thickness of the web 3-5 and the thickness of the side blades 3-3 are gradually reduced from the end connecting the body base 3-1 to the end far from the body base 3-1, and the blade tip 3-4 is disposed at the junction of the ends of the side blades 3-3 on two sides of the web 3-5 (the junction is located at the end of the side blades 3-3 far from the body base 3-1). The side blade 3-3 is used for cutting the honeycomb material in the machining; with reference to fig. 5 and 6, in which the angle gamma of the side blade edge 3-3 is 25 deg. to 30 deg., the sharpness of the blade increases as gamma decreases and the strength of the blade decreases as gamma decreases. The inventors found that gamma greater than 30 ° would produce a large cutting force at the time of actual cutting, which is disadvantageous for machining. In this embodiment gamma is used to obtain a minimum cutting force of 25 deg.. The angle between the cutter flanks 3-5 on both sides of the straight blade cutter body 3 is delta, and the quality of the cutter can be further lightened by arranging the cutter flanks 3-5, and the output amplitude is improved, wherein the delta takes a value of 2.2 degrees in the embodiment. The knife point 3-4 is provided with a knife edge perpendicular to the axial direction of the amplitude transformer 4, the knife point 3-4 is provided with a knife edge, so that the phenomenon of strain and burrs is avoided when the honeycomb material is cut, in the embodiment, the included angle of the knife point 3-4 knife edges on two sides of the straight knife body 3 is beta, and in the embodiment, the beta takes a value of 9 degrees.

A chamfer 3-2 is arranged between the cutter body base body 3-1 and the side cutter blade 3-3, the size of the chamfer 3-2 is 1/2 of the thickness of the cutter body base body 3-1, and stress concentration during high-frequency vibration of the straight cutter body 3 is reduced by arranging the chamfer 3-2.

Referring to fig. 7, the tool holder 1 is provided with an external thread part 1-5, a tool withdrawal groove 1-4, a guide post part 1-3 and a clamping part 1-2 in sequence from a first end to a second end, and referring to fig. 11, the interface end of the amplitude transformer 4 is provided with an internal thread part 4-1 and a guide groove part 4-2, the guide groove part 4-2 is arranged at the external port of the internal thread part 4-1, wherein the external thread part 1-5 and the internal thread part 4-1 are matched with each other, so that the tool holder 1 is fixedly connected at the interface of the amplitude transformer 4; the guide column part 1-3 and the guide groove part 4-2 are correspondingly arranged, so that the central axis of the straight blade cutter body 3 welded and connected on the cutter holder 1 coincides with the central axis of the amplitude transformer 4; wherein the surface roughness of the guide post part 1-3 and the guide groove part 4-2 is not more than Ra0.8, the tolerance of the guide post part 1-3 is H6, and the tolerance of the guide groove part 4-2 is H7, so as to further improve the overall precision of the ultrasonic straight blade knife. The tool withdrawal groove 1-4 is formed in one end of the external thread part 1-5, which is close to the guide post part 1-3, wherein chamfers are respectively arranged between the tool withdrawal groove 1-4 and the external thread part 1-5 and between the tool withdrawal groove 1-4 and the guide post part 1-3, so that the phenomenon that the threads break due to stress concentration generated by a cutter during high-frequency vibration is avoided. In the embodiment, the clamping part 1-2 adopts an outer hexagonal clamping structure and is used for disassembly and installation when the cutter is replaced; the middle of the clamping part 1-2 is provided with a welding groove 1-1, and the first end of the cutter body substrate 3-1 is welded and connected in the welding groove 1-1 through a welding flux 2.

As shown in fig. 2, when ultrasonic energy passes through the tool apron 1, three ultrasonic energy transmission paths are respectively an a-thread transmission path, a B-guide surface transmission path and a C-end surface transmission path, and the speed of ultrasonic energy transmitted by the transmission paths in the three paths is C > a > B. As shown in fig. 8, in order to ensure the ultrasonic transmission contact area and improve the connection strength, the thread pitch P of the thread is reduced on the basis of ensuring the principle that the size of the large diameter D of the thread of the external thread part 1-5 is unchanged, the thread pitch P is reduced on the basis of the thread pitch of the coarse thread, the small diameter d=d-P is 1.0825, the thread pitch P is reduced, the small diameter D is increased, and the fatigue resistance is improved; and the connection strength between the tool holder 1 and the amplitude transformer 4 is improved under the condition of not influencing the ultrasonic transmission area. In this example D was set to 8.1mm and P was set to 1.1mm, the unconventional pitch. The outer diameter of the guide post portion 1-3 is required to be larger than the outer diameter of the male screw portion 1-5, and the outer diameter of the guide post portion 1-3 is set to Φ9mm in this embodiment.

As shown in fig. 9 and 10, the solder 2 is formed between the first end of the tool body base 3-1 and the second end of the tool holder 1, i.e., in the soldering bath 1-1, and is provided with a solder chamfer 2-1, a solder bottom 2-2 and a solder side 2-3, wherein the solder bottom 2-2 and the solder side 2-3 have thicknesses a, b, respectively, and the ranges of a, b should be between 0.005mm and 0.1mm when soldering is employed in this embodiment. To achieve a relatively balanced effect of the respective performances, a=b=0.05 is taken in this embodiment.

In the embodiment, the two cutter faces of the straight-edge cutter body 3 are completely symmetrical, and the hard alloy is selected as the material to improve the hardness and the wear resistance of the cutter; the tool apron 1 is made of high-strength steel, the welding material 2 is made of copper-silver alloy, the welding mode adopts brazing, and the welding material 2 is processed into a rounded structure (namely a structure of a welding material chamfer 2-1 shown in fig. 9) after the welding is finished, so that stress concentration is reduced, and the welding material is prevented from being damaged. The complete tool is acoustically at a frequency below 2.5 times the ultrasonic assembly frequency to avoid excessive frequency differences affecting the overall acoustic system. In the embodiment, the acoustic frequency of the cutter is 43612Hz, and the acoustic frequency after matching is 20.2K when the embodiment is applied to a 2KHz acoustic system. The deviation ratio was 0.2/20= 0.01,1% and considered acceptable.

As shown in fig. 12 and 13, a schematic structure of an ultrasonic straight blade according to a second embodiment of the present utility model is shown, and the difference between the present embodiment and the first embodiment is that the clamping portion 1-2 of the tool holder 1 is formed by connecting the guiding post portion 1-3, which is convenient for disassembly and assembly on one hand, and for molding on the other hand. In addition, the bottom surface 1-6 of the guide post part 1-3 near the external thread part 1-5 is in contact with the bottom surface of the guide groove part 4-2 for limiting the thread and responsible for the transmission of ultrasonic waves. Other structures of the ultrasonic straight blade in this embodiment are the same as those of the first embodiment, and will not be described here again.

As shown in fig. 14 and 15, which are schematic structural diagrams of an ultrasonic straight blade knife according to the third embodiment of the present utility model, the difference between the present embodiment and the first embodiment is that the clamping portion 1-2 of the tool holder 1 is formed by connecting the guiding post portion 1-3, the guiding post portion 1-3 adopts a tapered structure, correspondingly, the guiding groove portion 4-2 of the horn 4 also adopts a tapered structure, which is convenient for disassembly and assembly, and is convenient for molding, and the tapered structure makes the tool holder 1 positioned more accurately when mounted on the horn 4, the contact surface is larger, the degree of attachment of the two tapered surfaces is increased along with the increase of the pretightening force of the screw, and the small deformation of the tapered surfaces also repairs the error of the tapered surfaces generated by the machining. In addition, the bottom surface 1-6 of the guide post part 1-3 near the external thread part 1-5 is in contact with the bottom surface of the guide groove part 4-2 for limiting the thread and responsible for the transmission of ultrasonic waves. Other structures of the ultrasonic straight blade in this embodiment are the same as those of the first embodiment, and will not be described here again.

The background section of the present utility model may contain background information about the problem or environment of the present utility model rather than the prior art described by others. Accordingly, inclusion in the background section is not an admission of prior art by the applicant.

The foregoing is a further detailed description of the utility model in connection with specific/preferred embodiments, and it is not intended that the utility model be limited to such description. It will be apparent to those skilled in the art that several alternatives or modifications can be made to the described embodiments without departing from the spirit of the utility model, and these alternatives or modifications should be considered to be within the scope of the utility model. In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "preferred embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction. Although embodiments of the present utility model and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope as defined by the appended claims.

Claims (10)

1. The utility model provides an supersound straight sword, its characterized in that includes amplitude transformer, blade holder and straight sword cutter body, the first end fixed connection of blade holder is in the interface department of amplitude transformer, straight sword cutter body includes cutter body base member, sword abdomen, side cutting edge and knife tip, the first end of cutter body base member passes through solder joint and is in the second end of blade holder, the sword abdomen with the side cutting edge is connected set up in the second end of cutter body base member, the side cutting edge symmetry set up in the both sides department of sword abdomen, just the thickness of sword abdomen with the thickness of side cutting edge is from connecting the one end of cutter body base member to keeping away from the one end junction of cutter body base member, the knife tip set up in the sword both sides.

2. The ultrasonic straight blade of claim 1, wherein the first end of the blade holder is provided with an external thread portion and a guide post portion, the guide post portion is connected to the second end of the external thread portion, the interface end of the amplitude transformer is provided with an internal thread portion and a guide groove portion, the guide groove portion is arranged at the external port of the internal thread portion, the external thread portion and the internal thread portion are mutually matched, the guide post portion and the guide groove portion are correspondingly arranged, and the surface roughness of the guide post portion and the guide groove portion is not greater than ra0.8.

3. The ultrasonic straight blade of claim 2, wherein the guide post portion and the guide slot portion are each tapered.

4. The ultrasonic straight blade of claim 2, wherein the external thread portion adopts a smaller pitch than a standard coarse thread on the basis of a predetermined large diameter, and the small diameter d=d-p× 1.0825 of the external thread portion, wherein D is the large diameter of the external thread portion, the value of D ranges from 7.8mm to 8.2mm, P is the pitch of the external thread portion, and the value of P ranges from 1.058mm to 1.33mm.

5. The ultrasonic straight blade of claim 2, wherein a relief groove is formed in the outer thread portion at one end close to the guide post portion, and chamfers are respectively arranged between the relief groove and the outer thread portion and between the relief groove and the guide post portion.

6. The ultrasonic straight blade of claim 1, wherein the second end of the blade holder is provided with a clamping portion, a welding groove is formed in the middle of the clamping portion, and the first end of the blade body substrate is connected in the welding groove through welding.

7. The ultrasonic straight blade of claim 1, wherein a chamfer is provided between the blade body base and the side blade, the chamfer having a dimension of 1/2 of the thickness of the blade body base.

8. The ultrasonic straight blade of claim 1, wherein the angle of the side blade is from 25 ° to 30 °.

9. The ultrasonic straight blade of claim 1, wherein the tip is provided with a blade edge perpendicular to the axial direction of the horn.

10. The ultrasonic straight blade of claim 1, wherein the thickness of the solder between the first end of the blade body base and the second end of the blade holder is 0.01mm to 0.1mm.