CN116638137B - A lightweight vibration-damping milling cutter - Google Patents
A lightweight vibration-damping milling cutterInfo
- Publication number
- CN116638137B CN116638137B CN202310778627.9A CN202310778627A CN116638137B CN 116638137 B CN116638137 B CN 116638137B CN 202310778627 A CN202310778627 A CN 202310778627A CN 116638137 B CN116638137 B CN 116638137B
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- Prior art keywords
- rod
- cos
- cutter head
- sin
- vibration
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/08—Disc-type cutters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/003—Milling-cutters with vibration suppressing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/16—Milling-cutters characterised by physical features other than shape
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention provides a light vibration reduction milling cutter head, and belongs to the field of machining. Comprises a cutter head shell, a cutter handle shell, a light vibration reduction unit and a vibration reduction medium. The cutter head comprises a cutter head shell, a light vibration reduction unit and a vibration reduction medium, wherein a flange is arranged at the bottom of the cutter head shell, a concave blade mounting seat is arranged on the flange, a filling opening is arranged on the side wall of the cutter head shell, a hollow cavity is formed in the cutter head shell, the light vibration reduction unit is arranged in the hollow cavity in the cutter head shell and is connected with the cutter head shell, and the cutter head shell is filled with the vibration reduction medium. According to the design method of the light-weight vibration reduction milling cutter, the light-weight vibration reduction units are periodically densely arranged in the cutter head and the cutter bar, so that the dead weights of the cutter head and the cutter bar can be greatly reduced, and meanwhile, each light-weight vibration reduction unit can keep enough strength. The vibration damping medium is filled in the light vibration damping unit, so that the vibration problem generated in the processing can be effectively solved.
Description
Technical Field
The invention relates to a light vibration reduction milling cutter head, and belongs to the technical field of machining.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the disclosure and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
The lightweight technology is widely applied to design, manufacture and production. In the current practical production, the milling cutter handle and the cutter head are both of solid metal structures. However, there are problems in that the torque required for the spindle to rotate the tool shank and the cutter head increases due to the large dead weights of the tool shank and the cutter head. This further results in power being consumed by the operation of the machine tool, resulting in waste of energy.
Some studies have been conducted to provide a lightweight design for tools, however, only limited modifications to the tool housing have been made. The lightweight design and the vibration reduction function of the cutter cannot be considered at the same time, and vibration and even cutting chatter can be caused in the machining process. The existing cutter cannot reduce cutter vibration while realizing light-weight design.
Aiming at the technical problems in the background, no effective technical proposal is proposed at present.
Disclosure of Invention
The invention aims to provide a light vibration reduction milling cutter head, which solves the defects in the aspect of flatness control in the grinding of an ultrathin sample in the background technology.
The invention aims to achieve the aim, and the aim is achieved by the following technical scheme:
the cutter head comprises a cutter head shell, a filling port, a light vibration reduction unit and vibration reduction media, wherein a flange is arranged at the bottom of the cutter head shell, a concave blade mounting seat is arranged on the flange, the side wall of the cutter head shell is provided with the filling port, a hollow cavity is formed in the cutter head shell, the light vibration reduction unit is arranged in the hollow cavity of the cutter head shell and connected with the cutter head shell, and the vibration reduction media are filled in the cutter head shell.
Preferably, the lightweight vibration damping units are formed by periodically and densely arranging single cell structures, and the single cell structures contain non-solid hollow parts and solid support structures.
Preferably, the unit cell structure of the lightweight vibration damping unit is an nxn vibration damping cubic structure, the vibration damping cubic structure comprises a rod OA, a rod AB, a rod BC, a rod OD, a rod DE, a rod EF, a rod OG, a rod GH, a rod HI, a rod OJ, a rod JK, a rod KL, a rod OM, a rod MN, a rod NP, a rod OQ, a rod QR and a rod RS, wherein A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S represents the end points of the rod, and the end point coordinates of each rod are as follows ：O(0,0,0)、A(0.25n,0.25n,0)、B(0.5n,0,0)、C(n,0,0)、D(-0.25n,0.25n,0)、E(0,0.5n,0)、F(0,n,0)、G(-0.25n,-0.25n,0)、H(-0.5n,0,0)、I(-n,0,0)、J(0.25n,-0.25n,0)、K(0,-0.5n,0)、L(0,-n,0)、M(0,0.25n,0.25n)、N(0,0,0.5n)、P(0,0,n)、Q(0,-0.25n,-0.25n)、R(0,0,-0.5n)、S(0,0,-n).
Preferably, n is less than or equal to 50mm, and the radius of the rod OA, the rod AB, the rod BC, the rod OD, the rod DE, the rod EF, the rod OG, the rod GH, the rod HI, the rod OJ, the rod JK, the rod KL, the rod OM, the rod MN, the rod NP, the rod OQ, the rod QR, and the rod RS is less than 15mm.
Preferably, the unit cell structure is designed based on minimum curved surface filling, and the minimum curved surface expression is as follows:
cos(x)+cos(y)+cos(z)=0.2;
0.5cos(y)sin(2x)sin(z)+0.5cos(z)sin(2y)sin(x)+0.5cos(x)sin(2z)sin(y)+0.
5cos(2x)cos(2y)-0.5cos(2x)cos(2z)-0.5cos(2z)cos(2y)=0.1;
2cos(x)cos(z)+2cos(x)cos(y)+2cos(y)cos(z)-cos(2x)-cos(2y)-cos(2z)=0.1;
wherein X represents the coordinate of the unit cell structure on the X axis under the Cartesian coordinate system, Y represents the coordinate of the unit cell structure on the Y axis under the Cartesian coordinate system, and Z represents the coordinate of the unit cell structure on the Z axis under the Cartesian coordinate system.
Preferably, the overall dimension of the unit cell structure filled with the extremely small curved surface is not more than 50mm multiplied by 50mm, and the thickness of the curved surface is not more than 15mm.
Preferably, the vibration reduction medium is high damping liquid or solid, and is filled into a non-solid hollow part in the lightweight vibration reduction unit in the cutter head shell, and the nano metal material is coupled in the preparation of the high damping liquid or solid.
Preferably, the high damping liquid is a polyol polyester material, and the high damping solid is rubber polydimethylsiloxane or a liquid crystal elastomer.
Preferably, the shell thickness of the cutterhead shell is 3mm-10mm.
The light vibration reduction units are periodically densely arranged in the cutterhead and the cutter bar, so that the dead weights of the cutterhead and the cutter bar can be greatly reduced, and each light vibration reduction unit can keep enough strength.
According to the lightweight cutter, the lightweight vibration reduction unit is filled with the vibration reduction medium, so that the problem of vibration increase caused by the fact that the dead weight of the cutter head is reduced and the rigidity is reduced can be effectively solved.
According to the invention, an integrated preparation mode of metal additive manufacturing is adopted, so that the cutterhead with the light vibration reduction unit with the complex shape can be efficiently prepared, and meanwhile, the waste phenomenon of raw materials caused by traditional material reduction manufacturing is avoided.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
FIG. 1 is a schematic view of a lightweight vibration damping milling cutter head according to the present invention;
FIG. 2 is a schematic view of a vibration damping cubic structure light weight vibration damping unit cell structure of the present invention;
FIG. 3 is a schematic view showing the axial distribution of a unit cell structure of a vibration damping cubic structure light weight vibration damping unit according to the present invention
FIG. 4 is a schematic view of an arrangement of light weight vibration damping units of a vibration damping cubic structure;
FIG. 5 is a schematic diagram of a regular arrangement of body centered cubic lightweight damper units;
FIG. 6 is a schematic view of the body centered cubic light weight damping unit cell structure of FIG. 5;
FIG. 7 is a schematic diagram of a regular arrangement of lightweight damper units of simple cubic construction;
FIG. 8 is a schematic view of the simple cubic lightweight damping unit cell of FIG. 7;
FIG. 9 is a schematic illustration of a lightweight vibration damping unit with different parameters and minimal curved surface profile;
in the figure, 1, a cutter head shell, 2, a filling port, 3, a light vibration reduction unit and 4, a vibration reduction medium.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, the present embodiment describes a lightweight vibration damping milling cutter head including a cutter head housing 1, a filling port 2, a lightweight vibration damping unit 3, and a vibration damping medium 4. The cutter head shell comprises a cutter head shell body and is characterized in that a flange is arranged at the bottom of the cutter head shell body, a concave blade mounting seat is arranged on the flange, a filling opening 2 is arranged on the side wall of the cutter head shell body, a hollow cavity is formed in the cutter head shell body 1, a light vibration reduction unit 3 is arranged in the hollow cavity of the cutter head shell body 1 and is connected with the cutter head shell body 1, and a vibration reduction medium is filled in the cutter head shell body 1. The cutter head shell 1, the light weight vibration reduction unit 3 and the vibration reduction medium 4 complete the light weight and vibration reduction functions of the cutter head.
The light vibration damping units 3 are arranged in the cutterhead housing 1 in a three-way array of cartesian coordinates X/Y/X by a unit cell structure, and the vibration damping medium 4 is filled in the light vibration damping units 3 to reduce cutting vibrations generated during machining.
In the present embodiment, the unit cell structure of the light-weight vibration damping unit 3 is preferably a micro-truss structure such as a body-centered cubic structure, a simple cubic structure, or a face-centered cubic structure.
It should be noted that the thickness of the cutter head housing in this embodiment is preferably 5mm, and sufficient rigidity is ensured while the mass is reduced.
It should be noted that, in this embodiment, the light vibration reduction unit 3 and the cutterhead housing 1 are integrally manufactured, and the manufacturing process is preferably metal additive manufacturing.
The damping medium 4 is preferably a liquid damping material, and in this embodiment, is preferably a polyol polyester. The polyol polyester polymer material has obvious viscoelasticity, and deformation does not occur immediately under the action of external force, but the attractive force and friction among mutually entangled polymer chains need to be overcome, so that energy consumption is required. By utilizing the characteristic of polyol polyester, the energy in impact and vibration is absorbed, and then the energy is released in the form of heat energy, namely the mechanical loss occurs, so that the purposes of reducing the amplitude value and reducing the vibration are achieved.
The polyol polyester liquid damping material has the characteristics that high damping characteristics of linear aliphatic binary polyester are difficult to realize, aromatic rings and branched chains are required to be introduced into polyester molecular chains, and a coupling agent is required to be used for coupling nano metal materials to improve heat conduction performance.
The vibration damping medium 4 is filled into the lightweight vibration damping unit 3 in the shell 1 through the filling port 2 on the shell, vibration is generated by cutting of a cutter in the actual machining process, and the vibration is absorbed by the internal vibration damping medium.
Example two
As shown in fig. 2-5, the single cell structure is preferably a vibration damping cubic structure, and the unit cell structure of the lightweight vibration damping unit is an nxn vibration damping cubic structure, and the vibration damping cubic structure comprises a rod OA, a rod AB, a rod BC, a rod OD, a rod DE, a rod EF, a rod OG, a rod GH, a rod HI, a rod OJ, a rod JK, a rod KL, a rod OM, a rod MN, a rod NP, a rod OQ, a rod QR, and a rod RS, wherein A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S represents the end point of the rod.
Establishing a three-dimensional Cartesian coordinate system by taking an endpoint O as an origin, wherein the coordinates of each rod end point are as follows ：O(0,0,0)、A(0.25n,0.25n,0)、B(0.5n,0,0)、C(n,0,0)、D(-0.25n,0.25n,0)、E(0,0.5n,0)、F(0,n,0)、G(-0.25n,-0.25n,0)、H(-0.5n,0,0)、I(-n,0,0)、J(0.25n,-0.25n,0)、K(0,-0.5n,0)、L(0,-n,0)、M(0,0.25n,0.25n)、N(0,0,0.5n)、P(0,0,n)、Q(0,-0.25n,-0.25n)、R(0,0,-0.5n)、S(0,0,-n).
Further, the radius of the rod OA, the rod AB, the rod BC, the rod OD, the rod DE, the rod EF, the rod OG, the rod GH, the rod HI, the rod OJ, the rod JK, the rod KL, the rod OM, the rod MN, the rod NP, the rod OQ, the rod QR, the rod RS is less than 15mm.
Example III
As shown in fig. 6, the present embodiment describes a preferred structure of a lightweight vibration damping unit cell structure, which is designed based on a minimum curved surface filling.
The minimum curved surface expression is preferably described by the following formula:
cos(x)+cos(y)+cos(z)=0.2;
0.5cos(y)sin(2x)sin(z)+0.5cos(z)sin(2y)sin(x)+0.5cos(x)sin(2z)sin(y)+0.
5cos(2x)cos(2y)-0.5cos(2x)cos(2z)-0.5cos(2z)cos(2y)=0.1;
2cos(x)cos(z)+2cos(x)cos(y)+2cos(y)cos(z)-cos(2x)-cos(2y)-cos(2z)=0.1。
The minimum curved surface generated based on the hidden function relation provided by the invention has a periodic rule along the X/Y/Z axis, can replace an array structure formed by a micro truss structure along the X/Y/Z axis, is defined as a minimum curved surface unit cell structure, and when the unit cell structure array is used for forming a vibration reduction unit, the overall dimension of the unit cell structure is not more than 50mm multiplied by 50mm, and the thickness of the curved surface is not more than 15mm.
The lightweight damping unit cell structure minimal surface expression proposed by the invention also includes, but is not limited to, the following description:
sin(x)+sin(y)+sin(z)
sin(x)+sin(y)-z
cos(x)+cos(y)+cos(z)
sin(x)*cos(y)+sin(z)*cos(x)+sin(y)*cos(z)
cos(x)*cos(y)*cos(z)-sin(x)*sin(y)*sin(z)
2*(cos(x)*cos(y)+cos(y)*cos(z)+cos(z)*cos(x))-(cos(2*x)+cos(2*y)+cos(2*
z))
4*cos(x)*cos(y)*cos(z)-(cos(2*x)*cos(2*y)+cos(2*x)*cos(2*z)+cos(2*y)*co
s(2*z))
0.5*(sin(2*x)*cos(y)*sin(z)+sin(2*y)*cos(z)*sin(x)+sin(2*z)*cos(x)*sin(
y))-0.5*(cos(2*x)*cos(2*y)+cos(2*x)*cos(2*z)+cos(2*y)*cos(2*z))
10*(cos(x)+cos(y)+cos(z))-5.1*(cos(x)*cos(y)+cos(x)*cos(z)+cos(y)*cos(z)
)
-2*(sin(2*x)*cos(y)*sin(z)+sin(2*y)*cos(z)*sin(x)+sin(2*z)*cos(x)*sin(y)
)+(cos(2*x)*cos(2*y)+cos(2*x)*cos(2*z)+cos(2*y)*cos(2*z))
sin(x)*sin(y)*sin(z)+sin(x)*cos(y)*cos(z)+cos(x)*sin(y)*cos(z)+cos(x)*c
os(y)*sin(z)
u*sin(x)*sin(2*y)*sin(3*z)+v*sin(2*x)*sin(y)*sin(3*z)+w*sin(2*x)*sin(3*
y)*sin(z)+a*sin(3*x)*sin(y)*sin(2*z)+b*sin(x)*sin(3*y)*sin(2*z)+c*sin(3*x)*
sin(2*y)*sin(z)
cos(2*x)*sin(y)*cos(z)+cos(2*y)*sin(z)*cos(x)+cos(2*z)*sin(x)*cos(y)-0.
sin(x)*sin(y)*sin(z)+sin(x)*cos(y)*cos(z)+cos(x)*sin(y)*cos(z)+cos(x)*c
os(y)*sin(z)
3*(cos(x)+cos(y)+cos(z))+4*cos(x)*cos(y)*cos(z)
10.0*(cos(x)*cos(y)+cos(y)*cos(z)+cos(z)*cos(x))-5.0*(cos(x*2)+cos(y*2)
+cos(2*2))-1.0
cos(x)*cos(y)+cos(y)*cos(z)+cos(x)*cos(z)-3*cos(x)*cos(y)*cos(z)
a*(cos(x)*cos(y)+b*cos(y)*cos(z)+cos(x)*cos(z))-c*cos(x)*cos(y)*cos(z)
2.75*(sin(2*x)*sin(z)*cos(y)+sin(2*y)*sin(x)*cos(z)+sin(2*z)*sin(y)*cos
It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and the present invention is not limited thereto, but may be modified or substituted for some of the technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The light vibration reduction milling cutter head is characterized by comprising a cutter head shell (1), a filling port (2), a light vibration reduction unit (3) and a vibration reduction medium (4), wherein a flange is arranged at the bottom of the cutter head shell (1), and is provided with an inwards concave blade mounting seat;
the light vibration reduction units (3) are formed by periodically and densely arranging unit cell structures, and the unit cell structures comprise non-solid hollow parts and solid supporting structures;
The unit cell structure of the light weight vibration damping unit is an n multiplied by n vibration damping cubic structure, the vibration damping cubic structure comprises a rod OA, a rod AB, a rod BC, a rod OD, a rod DE, a rod EF, a rod OG, a rod GH, a rod HI, a rod OJ, a rod JK, a rod KL, a rod OM, a rod MN, a rod NP, a rod OQ, a rod QR and a rod RS, wherein A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S represents the end points of the rod, and the end point coordinates of each rod are as follows ：O(0,0,0)、A(0.25n,0.25n,0)、B(0.5n,0,0)、C(n,0,0)、D(-0.25n,0.25n,0)、E(0,0.5n,0)、F(0,n,0)、G(-0.25n,-0.25n,0)、H(-0.5n,0,0)、I(-n,0,0)、J(0.25n,-0.25n,0)、K(0,-0.5n,0)、L(0,-n,0)、M(0,0.25n,0.25n)、N(0,0,0.5n)、P(0,0,n)、Q(0,-0.25n,-0.25n)、R(0,0,-0.5n)、S(0,0,-n);
The unit cell structure is based on minimum curved surface filling, and the minimum curved surface expression is as follows:
cos(x)+cos(y)+cos(z)=0.2;
0.5cos(y)sin(2x)sin(z)+0.5cos(z)sin(2y)sin(x)+0.5cos(x)sin(2z)sin(y)+0.
5cos(2x)cos(2y)-0.5cos(2x)cos(2z)-0.5cos(2z)cos(2y)=0.1;
2cos(x)cos(z)+2cos(x)cos(y)+2cos(y)cos(z)-cos(2x)-cos(2y)-cos(2z)=0.1;
wherein X represents the coordinate of the unit cell structure on the X axis under the Cartesian coordinate system, Y represents the coordinate of the unit cell structure on the Y axis under the Cartesian coordinate system, and Z represents the coordinate of the unit cell structure on the Z axis under the Cartesian coordinate system.
2. The lightweight vibration-damping milling cutter disc of claim 1, wherein the n is 50mm or less and the radii of bars OA, AB, BC, OD, DE, EF, OG, GH, HI, OJ, JK, KL, OM, MN, NP, OQ, QR, RS are less than 15mm.
3. The lightweight vibration-damping milling cutter head of claim 1, wherein the very small curve-filled unit cell structure has an overall dimension of no more than 50mm x50 mm and a curve thickness of no more than 15mm.
4. The lightweight vibration-damping milling cutter head according to claim 1, characterized in that the vibration-damping medium (4) is a high damping liquid or solid, which is coupled with nano-metal material in preparation, filled into the non-solid hollow part in the lightweight vibration-damping unit (3) inside the cutter head housing (1).
5. The lightweight vibration-damped milling cutter disc of claim 4, wherein said high damping liquid is a polyol polyester material and said high damping solid is a rubbery polydimethylsiloxane or a liquid crystal elastomer.
6. A lightweight vibration-damped milling cutter disc according to claim 1, wherein the shell thickness of the disc housing (1) is 3-10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310778627.9A CN116638137B (en) | 2023-06-29 | 2023-06-29 | A lightweight vibration-damping milling cutter |
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|---|---|---|---|
| CN202310778627.9A CN116638137B (en) | 2023-06-29 | 2023-06-29 | A lightweight vibration-damping milling cutter |
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|---|---|
| CN116638137A CN116638137A (en) | 2023-08-25 |
| CN116638137B true CN116638137B (en) | 2025-08-19 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108602134A (en) * | 2016-02-29 | 2018-09-28 | 山特维克知识产权股份有限公司 | Cutter hub, cutter and the method for manufacturing cutter hub |
| CN111219433A (en) * | 2019-08-29 | 2020-06-02 | 北京建筑大学 | Elastic metamaterial with three-dimensional periodic structure |
| CN114218706A (en) * | 2021-12-15 | 2022-03-22 | 中国科学院过程工程研究所 | Hard rock tunneling vibration reduction cutter head based on particle damping vibration reduction and damping vibration reduction design method thereof |
| CN114552858A (en) * | 2022-01-24 | 2022-05-27 | 重庆大学 | Light electric steering engine sound insulation shell based on Sheet-primative structure and manufacturing method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108356301A (en) * | 2018-04-17 | 2018-08-03 | 山东大学 | A kind of scatter-type periodic structure damping vibration attenuation turning tool rod |
-
2023
- 2023-06-29 CN CN202310778627.9A patent/CN116638137B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108602134A (en) * | 2016-02-29 | 2018-09-28 | 山特维克知识产权股份有限公司 | Cutter hub, cutter and the method for manufacturing cutter hub |
| CN111219433A (en) * | 2019-08-29 | 2020-06-02 | 北京建筑大学 | Elastic metamaterial with three-dimensional periodic structure |
| CN114218706A (en) * | 2021-12-15 | 2022-03-22 | 中国科学院过程工程研究所 | Hard rock tunneling vibration reduction cutter head based on particle damping vibration reduction and damping vibration reduction design method thereof |
| CN114552858A (en) * | 2022-01-24 | 2022-05-27 | 重庆大学 | Light electric steering engine sound insulation shell based on Sheet-primative structure and manufacturing method thereof |
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| CN116638137A (en) | 2023-08-25 |
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