CN108085632B - A kind of Plastic Forming and toughening process and its device based on ultrasonic vibration - Google Patents
A kind of Plastic Forming and toughening process and its device based on ultrasonic vibration Download PDFInfo
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- CN108085632B CN108085632B CN201711304450.XA CN201711304450A CN108085632B CN 108085632 B CN108085632 B CN 108085632B CN 201711304450 A CN201711304450 A CN 201711304450A CN 108085632 B CN108085632 B CN 108085632B
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- ultrasonic vibration
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2201/00—Treatment for obtaining particular effects
- C21D2201/03—Amorphous or microcrystalline structure
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Forging (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Powder Metallurgy (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention belongs to amorphous alloy thermoplastic forming fields, and disclose a kind of Plastic Forming based on ultrasonic vibration and gradient method for toughening and device.This method comprises: the position that (a) divides obdurability to be added on amorphous alloy part to be formed is used to form nanocrystalline toughening phase；(b) the toughening device used designed for forming, it includes the insert being connected with ultrasonic vibration amplitude transformer and heating rod, insert is corresponding with the position of obdurability to be added, and for applying ultrasonic vibration to it, heating rod is used for raw material blank heating to be processed to its forming temperature；(c) raw material blank is placed in device, heating rod heating, amorphous alloy part needed for device molding forming, starts ultrasonic vibration in clamping process, when die sinking stops.Invention additionally discloses used devices simultaneously.Through the invention, toughening carries out simultaneously with thermoplastic forming, realizes forming and the integration of toughening, simplifies production process, shortens process time, improves dimensional accuracy.
Description
Technical field
The invention belongs to amorphous alloy thermoplastic forming fields, more particularly, to a kind of plasticity based on ultrasonic vibration
Forming and gradient method for toughening and device.
Background technique
Amorphous alloy is a kind of new material for possessing the excellent properties such as high-intensitive, corrosion-resistant, wear-resistant.Amorphous alloy exists
Good superplasticity is shown under hot, can be realized part near-net-shape.But the significant brittleness at room temperature of amorphous alloy makes
Amorphous alloy part, once overloading, will directly occur brittle fracture and thoroughly fail, it is caused to be difficult to directly during military service
Applied to there are the occasions of shock loading.Therefore, it is necessary to further improve under the premise of not weakening amorphous alloy excellent properties
Its toughness, to improve the impact resistance of amorphous alloy part.
Amorphous alloy is in thermodynamics metastable state, can be sent to the transformation of its thermodynamics stable state certainly after obtaining enough energy,
Crystallization occurs.After amorphous alloy crystallization, performance is also changed correspondingly.It, can by forming nanocrystal inside amorphous alloy
To significantly improve its intensity and toughness.Therefore, can requirement according to practical service condition to amorphous alloy part performance, pass through
Certain mode is nanocrystalline in the local inductive formation of noncrystal substrate, forms the nanocrystalline toughening amorphous base with mechanical performance gradient
Composite material.
Patent CN101736213A proposes a kind of method for making amorphous alloy Strengthening and Toughening by being ultrasonically treated.This method passes through
Amorphous alloy is positioned below in the cooling water sink of amorphous alloy crystallization temperature, is then loaded under unit area in bottom of gullet
Power is not more than 3 × 104W/mm2Frequency of oscillation carry out the processing of alloy Strengthening and Toughening.Amorphous alloy is being broken after treatment by using the treatment method
Under the premise of intensity is constant, room temperature compressive plastic deformation ability has obvious raising, and relaxation thermal discharge also increases, but should
Method can only carry out whole Strengthening and Toughening processing to amorphous alloy sample, can not retain part amorphous area according to actual use demand
Domain, to form the metallic glass composite for having mechanical performance gradient；Patent CN102002659A proposes a kind of pair of amorphous alloy
The method that band is carried out continuously nano-crystallization.The program amorphous alloy glass transition temperature hereinafter, by AMORPHOUS ALLOY RIBBONS
It is pressed on power Vltrasonic device amplitude transformer top, AMORPHOUS ALLOY RIBBONS is directed at band application while moving Vltrasonic device amplitude transformer
Ultrasonication, to realize the continuous nano-crystallization of AMORPHOUS ALLOY RIBBONS, method can only carry out integration to AMORPHOUS ALLOY RIBBONS
Processing, can not both handle the actual parts for having complicated shape, can not realize nanocrystalline gradient toughening；Patent
CN105420522A proposes a kind of preparation method of metallic glass composite, and this method is by sheet amorphous alloy and the second phase of toughening
Material is alternately laminated to be placed in fixture, under conditions of constant pressure or gradually increased load, is added to the amorphous alloy and porous plate of stacking
Heat, while to Shih-chao's acoustic vibration in fact, amorphous alloy softens rapidly and is pressed into the hole of secondary phase toughening plate, to be moulded
Property good amorphous alloy composite material, but this method need by from the external world introduce the second opposite amorphous alloy carry out it is whole
Toughening is equally only applicable to the processing of plate class product, can not also handle the actual parts for having complicated shape and according to zero
Part service performance demand carries out the nanocrystalline gradient toughening in part；Above-mentioned three kinds of method for toughening, all fail and amorphous alloy thermoplastic
Property forming technology combine, but need then to carry out special processing after part completes figuration manufacture, technical process is multiple
Miscellaneous, the production cycle is longer.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides it is a kind of based on the plasticity of ultrasonic vibration at
Shape and gradient method for toughening and device need to reinforce toughness to part by using the insert connecting with ultrasonic vibration amplitude transformer
Region carries out ultrasonic vibration and thus solves its object is to make the regional area nano-crystallization of amorphous alloy part in thermoplasticity
In forming process the technical issues of local toughening.
To achieve the above object, according to one aspect of the present invention, a kind of Plastic Forming based on ultrasonic vibration is provided
And gradient method for toughening, which is characterized in that the method for toughening includes the following steps:
(a) it is directed to the actual use demand of amorphous alloy part to be formed, is drawn on amorphous alloy part to be formed
The position of obdurability to be added is separated, which is used to form nanocrystalline toughening phase, other positions retain its amorphous in formation
State；
(b) the toughening device of the amorphous alloy part to be formed designed for forming, the device and external drive mechanism phase
Even, which includes the insert being connected with ultrasonic vibration amplitude transformer and heating rod, the portion of the insert and the obdurability to be added
Position is corresponding, applies ultrasonic vibration for the position to toughness to be strengthened, the heating rod is used for former material material base to be processed
Material is heated to its forming temperature, and the parameter for the ultrasonic vibration that the ultrasonic vibration amplitude transformer generates is to use finite element numerical mould
Quasi- analysis ultrasonic vibrational energy obtains during propagating, wherein by adjusting the amplitude, frequency and power adjustment of ultrasonic vibration
Ultrasonic vibrational energy, when ultrasonic vibrational energy is more than energy threshold needed for nano-crystallization, the amplitude of corresponding ultrasonic vibration,
Frequency and power are the parameter of required ultrasonic vibration；
(c) raw material blank being placed in described device, the heating rod heats the raw material blank to its forming temperature,
Amorphous alloy part needed for described device molding forming, ultrasonic vibration starts in clamping process, until stopping when die sinking.
It is further preferred that glass transition temperature and crystallization temperature of the range of the forming temperature between the raw material blank
Between degree.
It is further preferred that the heating rod preferably uses resistance heating rod in step (b).
It is further preferred that the toughening device is preferably using the mold for being used for thermoplastic forming in step (b).
It is further preferred that the amorphous alloy is to include Pd, Pt, Au, Zr, Ti, Fe, Cu, Ni, Al, Mg or Ce base tool
The amorphous alloy of standby thermoplastic forming ability.
It is another aspect of this invention to provide that providing device used by a kind of above-mentioned method for toughening, which is characterized in that should
Device includes upper die and lower die and cavity plate,
The upper mold is oppositely arranged with lower die, and constitutes forming chamber with the cavity plate, is all provided in the upper die and lower die
It is equipped with formed punch and insert, the formed punch is connected with driving servo-pressing machine, for raw material blank to be configured to required three-dimensional
Structure, the insert are connected with ultrasonic vibration amplitude transformer, carry out ultrasonic vibration, the cavity plate for the position to toughness to be strengthened
In be provided with heating rod, the heating rod is for heating blank.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
1, the insert that the present invention is connected by using part with ultrasonic vibration amplitude transformer, the position of the insert and required toughening
It is corresponding, ultrasonic vibration is carried out to the position with this, realizes nano-crystallization process, the process and thermoplastic forming technique simultaneously into
Row does not need additionally after part completes figuration manufacture, then carries out special processing, process simplification, shortens curring time；
2, the present invention improves the toughness of material by using the mode of ultrasonic vibration, on the one hand since ultrasonic vibration can be shown
The material forming ability that improves is write, on the other hand, since the propagation of ultrasonic vibration wave has very strong directionality, vibrational energy point
Cloth may be implemented to orient accurate control, thus, nano-crystallization can be effectively facilitated using ultrasonic vibration, realize that amorphous alloy increases
It is tough；
3, the present invention uses resistance heating rod, on the one hand ensure that the forming temperature during thermoplastic forming, another party
Face can guarantee the uniformity in mould inside temperature field by adjusting the distribution of resistance heating rod；
4, method provided by the invention is based on ultrasonic vibration, by the nano-crystallization toughening and thermoplastic forming knot of amorphous alloy
Altogether, the integral process for realizing forming and toughening, significantly simplifies production process, shortens process time, improves
Dimensional accuracy, meanwhile, according to the practical service condition of amorphous alloy part, have mechanical performance gradient in inside parts formation
Amorphous alloy-based composite material microstructure can significantly improve the comprehensive performance of part.
Detailed description of the invention
Fig. 1 is the flow chart of method for toughening constructed by preferred embodiment according to the invention；
Fig. 2 is the structural representation of amorphous alloy gear member former constructed by preferred embodiment according to the invention
Figure.
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which:
Ultrasonic vibration ring under the upper ultrasonic vibration ring 2- upper punch 3- heating rod 4- cavity plate 5- raw material blank 6- of 1-
7- low punch
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Fig. 1 is the flow chart of method for toughening constructed by preferred embodiment according to the invention, as shown in Figure 1, a kind of base
Plastic Forming and gradient method for toughening in ultrasonic vibration comprising the following steps:
(1) according to the actual use demand of amorphous alloy part, high-intensitive, strong corrosion resistant and the performances such as wear-resistant are being needed
Position retain noncrystalline state, and form nanocrystalline toughening phase at the position for needing high tenacity, therefore in thermoplastic forming technique
When design, ultrasonic vibration is applied to the position for needing to form nanocrystalline toughening phase, and does not need to retain the position of noncrystalline state then not
Apply ultrasonic vibration.
(2) in mold design, at the position for needing to apply ultrasonic vibration, use what is be connected with ultrasonic vibration amplitude transformer
Insert adjusts the amplitude, frequency and function of ultrasonic vibration using the communication process of analysis of finite element by numerical simulation ultrasonic vibrational energy
Rate, so that the vibrational energy of toughening target area is more than the energy threshold of nano-crystallization, so that it is determined that the amplitude of ultrasonic vibration, frequency
Rate and power, mould inside insertion resistance heating rod are watching mold integral installation by blank heating to forming temperature is set
It takes on press machine.
(3) forming toughening integration
Amorphous alloy blank is put into die cavity, using resistance heating rod by blank heating to glass transition temperature and crystallization
Between temperature, lower die and cavity plate are remained stationary, and after upper mold downlink is contacted with blank, start ultrasonic vibration.Upper mold continues traveling downwardly, directly
It is closed completely to upper die and lower die and cavity plate, until amorphous alloy part required for obtaining.Stopping ultrasonic vibration, upper mold uplink,
It is detached from part.Lower die uplink, until part is ejected cavity plate.
Below with reference to embodiment and attached drawing, the present invention is described in more detail.
Fig. 2 is the structural representation of amorphous alloy gear member former constructed by preferred embodiment according to the invention
Figure, as shown in Fig. 2, being ultrasonic vibration auxiliary amorphous alloy gear member hot forging forming.
Since gear failure occurs mainly in wheel tooth position, it is therefore desirable to keeping spoke position amorphous simultaneously, it is right
Wheel tooth position carries out nano-crystallization toughening and, according to this demand, is devised with improving the impact resistance of amorphous alloy gear member
Forming device as shown in Fig. 2.
Forming device is made of upper die and lower die and 4 three parts of cavity plate.Wherein upper mold is by upper ultrasonic vibration ring 1 and upper punching
First 2 composition；Upper punch 2 is nested in inside ultrasonic vibration ring 2, has shoulder on upper punch 2, for limiting upper ultrasonic vibration ring 1
Movement.Lower die is made of lower ultrasonic vibration ring 6 and low punch 7, and low punch 7 is nested in inside lower ultrasonic vibration ring 6, low punch
There is shoulder on 7, for limiting the movement of lower ultrasonic vibration ring 6.Upper punch 2 is connect with servo-pressing machine top shoe.Low punch 7 with
The connection of servo-pressing machine sliding block.Upper ultrasonic vibration ring 1 and lower ultrasonic vibration ring 6 are connected with supersonic generator respectively.Cavity plate 4
Inwall processing has tooth form, and inside is embedded with resistance heating rod 3.
In forming, cylindrical blank 5 is first put into the inside of cavity plate 4.Blank 5 is heated to set by start-up resistor heating rod 3
Determine temperature.Lower die (6 and 7) and cavity plate 4 remain stationary.Upper punch 2 drives upper ultrasonic vibration ring 1 downlink together, until with blank 5
Upper surface contact.Ultrasonic vibration ring 1 and lower ultrasonic vibration ring 6, allow them with the frequency and amplitude vibration of setting in starting.Upper punching
First 2 continue that ultrasonic vibration ring 1 is driven to run down with the loading speed of setting, until blank 5 is fully populated with 4 inner cavity of cavity plate.
In the process, the marginal portion for acting on blank 5, the i.e. wheel tooth position of gear member are concentrated in ultrasonic vibration.It on the one hand can be significant
Promote material filling type chamber, improves parts size precision；On the other hand nano-crystallization is induced in wheel tooth position, realizes toughening, and
Spoke position then still keeps noncrystalline state.The ultrasonic vibration of ultrasonic vibration ring 1 and lower ultrasonic vibration ring 6, Yi Ji electricity in closing
Hinder heating rod 3.Upper ultrasonic vibration ring 1, upper punch 2, lower ultrasonic vibration ring 6 and low punch 7 together with identical speed uplink, until
Part 5 after forming is ejected to the inner cavity of cavity plate 5.Forming process terminates.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of Plastic Forming and gradient method for toughening based on ultrasonic vibration, which is characterized in that the method for toughening includes following
Step:
(a) it is directed to the actual use demand of amorphous alloy part to be formed, is marked off on amorphous alloy part to be formed
The position of obdurability to be added, the position are used to form nanocrystalline toughening phase, other positions retain its noncrystalline state in formation；
(b) the toughening device of the amorphous alloy part to be formed designed for forming, the device are connected with external drive mechanism, should
Device includes the insert being connected with ultrasonic vibration amplitude transformer and heating rod, and the insert is opposite with the position of the obdurability to be added
It answers, applies ultrasonic vibration for the position to toughness to be strengthened, the heating rod is used for raw material blank heating to be processed
To its forming temperature, the parameter for the ultrasonic vibration that the ultrasonic vibration amplitude transformer generates is using analysis of finite element by numerical simulation
Ultrasonic vibrational energy obtains during propagating, wherein by adjusting the vibration of the amplitude of ultrasonic vibration, frequency and power adjustment ultrasound
Energy, when the energy threshold needed for ultrasonic vibrational energy is more than nano-crystallization, the amplitude of corresponding ultrasonic vibration, frequency and
Power is the parameter of required ultrasonic vibration；
(c) raw material blank is placed in described device, the heating rod heats the raw material blank to its forming temperature, described
Amorphous alloy part needed for device molding forming, ultrasonic vibration starts in clamping process, until stopping when die sinking.
2. a kind of Plastic Forming and gradient method for toughening based on ultrasonic vibration as described in claim 1, which is characterized in that institute
The range of forming temperature is stated between the glass transition temperature and crystallization temperature of the raw material blank.
3. a kind of Plastic Forming and gradient method for toughening based on ultrasonic vibration as described in claim 1, which is characterized in that
In step (b), the heating rod preferably uses resistance heating rod.
4. a kind of Plastic Forming and gradient method for toughening based on ultrasonic vibration as described in claim 1, which is characterized in that
In step (b), the toughening device uses the mold for thermoplastic forming.
5. a kind of Plastic Forming and gradient method for toughening based on ultrasonic vibration as described in claim 1, which is characterized in that institute
Stating amorphous alloy is the amorphous for having thermoplastic forming ability for including Pd, Pt, Au, Zr, Ti, Fe, Cu, Ni, Al, Mg or Ce base
Alloy.
6. device used by a kind of method for toughening as described in any one in claim 1-5, which is characterized in that the device includes
Upper die and lower die and cavity plate,
The upper mold is oppositely arranged with lower die, and constitutes forming chamber with the cavity plate, is provided in the upper die and lower die
Formed punch and insert, the formed punch is connected with driving servo-pressing machine, for raw material blank to be configured to required three-dimensional structure,
The insert is connected with ultrasonic vibration amplitude transformer, carries out ultrasonic vibration for the position to toughness to be strengthened, sets in the cavity plate
It is equipped with heating rod, the heating rod is for heating blank.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711304450.XA CN108085632B (en) | 2017-12-11 | 2017-12-11 | A kind of Plastic Forming and toughening process and its device based on ultrasonic vibration |
| PCT/CN2017/117069 WO2019113995A1 (en) | 2017-12-11 | 2017-12-19 | Plastic forming and toughening process method and apparatus based on ultrasonic vibration |
| EP17916449.6A EP3530772B1 (en) | 2017-12-11 | 2017-12-19 | Plastic forming and toughening process method and apparatus based on ultrasonic vibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711304450.XA CN108085632B (en) | 2017-12-11 | 2017-12-11 | A kind of Plastic Forming and toughening process and its device based on ultrasonic vibration |
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| Publication Number | Publication Date |
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| CN108085632A CN108085632A (en) | 2018-05-29 |
| CN108085632B true CN108085632B (en) | 2019-07-23 |
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| CN201711304450.XA Active CN108085632B (en) | 2017-12-11 | 2017-12-11 | A kind of Plastic Forming and toughening process and its device based on ultrasonic vibration |
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| Country | Link |
|---|---|
| EP (1) | EP3530772B1 (en) |
| CN (1) | CN108085632B (en) |
| WO (1) | WO2019113995A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109576514B (en) * | 2018-11-05 | 2021-04-06 | 华中科技大学 | Amorphous matrix composite material, preparation method and ultrasonic vibration thermoplastic forming device |
| CN110026478B (en) * | 2019-04-30 | 2024-05-03 | 中国民用航空飞行学院 | Method and device for vibration creep composite aging incremental forming based on pneumatic loading |
| CN110117711B (en) * | 2019-05-05 | 2021-01-19 | 深圳大学 | Method for driving rapid rejuvenation of amorphous alloy |
| JP7207347B2 (en) * | 2020-02-13 | 2023-01-18 | トヨタ自動車株式会社 | Manufacturing method of punched material |
| CN111531175A (en) * | 2020-05-09 | 2020-08-14 | 苏州大学 | Powder slurry ultrasonic field assisted embossing forming microstructure device |
| CN111590190B (en) * | 2020-05-28 | 2021-08-03 | 广东工业大学 | Ultrasonic friction welding forming method for large-size amorphous alloy |
| CN111753452B (en) * | 2020-06-23 | 2023-04-07 | 华中科技大学 | Energy field assisted intelligent multi-point forming method and system for amorphous alloy part |
| CN112077303A (en) * | 2020-08-20 | 2020-12-15 | 崇义章源钨业股份有限公司 | Rod and wire continuous row die and manufacturing method thereof |
| CN114058890B (en) * | 2021-11-24 | 2022-04-19 | 西北工业大学 | Method for preparing Mg-Al-Zn-Mn-Cu multi-element alloy by three-dimensional ultrasonic combined sound field detection |
| CN114178387B (en) * | 2021-12-14 | 2023-07-04 | 沈阳航空航天大学 | Ultrasonic vibration auxiliary combustion chamber cap cover viscous medium forming device |
| CN115847883A (en) * | 2022-11-14 | 2023-03-28 | 临海伟星新型建材有限公司 | Method and device for preparing high-toughness PP-R plastic pipeline by using vibration-temperature composite field annealing |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3530772A4 (en) | 2019-12-18 |
| WO2019113995A1 (en) | 2019-06-20 |
| CN108085632A (en) | 2018-05-29 |
| EP3530772B1 (en) | 2021-06-16 |
| EP3530772A1 (en) | 2019-08-28 |
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