WO2012036583A1 - Procédé de thixo-pressage d'une thixo-ébauche cylindrique en mode de phase solide superplastique - Google Patents

Procédé de thixo-pressage d'une thixo-ébauche cylindrique en mode de phase solide superplastique Download PDF

Info

Publication number
WO2012036583A1
WO2012036583A1 PCT/RU2010/000771 RU2010000771W WO2012036583A1 WO 2012036583 A1 WO2012036583 A1 WO 2012036583A1 RU 2010000771 W RU2010000771 W RU 2010000771W WO 2012036583 A1 WO2012036583 A1 WO 2012036583A1
Authority
WO
WIPO (PCT)
Prior art keywords
phase
thixo
flow
blank
solid phase
Prior art date
Application number
PCT/RU2010/000771
Other languages
English (en)
Russian (ru)
Inventor
Борис Иванович СЕМЁНОВ
Куштар Межлумович КУШТАРОВ
Никита Андреевич ДЖИНДО
Тхань Бинь НГО
Original Assignee
Государственное Образовательное Учреждение Высшего Профессионального Образования "Московский Государственный Технический Университет Имени Н.Э.Баумана" (Мгту Им. Н.Э.Баумана)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Государственное Образовательное Учреждение Высшего Профессионального Образования "Московский Государственный Технический Университет Имени Н.Э.Баумана" (Мгту Им. Н.Э.Баумана) filed Critical Государственное Образовательное Учреждение Высшего Профессионального Образования "Московский Государственный Технический Университет Имени Н.Э.Баумана" (Мгту Им. Н.Э.Баумана)
Publication of WO2012036583A1 publication Critical patent/WO2012036583A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/007—Semi-solid pressure die casting

Definitions

  • the invention relates to the processing of metals by pressure and can be used in the manufacture of products with fibrous morphology of crystals of the alloy base by plastic processing of cylindrical thix harvesting by thixoextrusion and thixoforging methods in the superplasticity mode of its solid phase.
  • Compression is a forming process in which a cylindrical blank is first placed in a container, and then pressed by a punch with extrusion of metal through a forming hole of a smaller cross-sectional area.
  • Industrial commercialized pressing processes are usually used in the production of longitudinal alloys from light alloys with complex cross-sectional geometry, ensuring the achievement of the highest mechanical properties of the alloys.
  • the main characteristic of the pressing process is the degree of drawing.
  • complex profiles of light alloys on an industrial scale are produced by compression in the solid state. If the force necessary to achieve a high degree of drawing is higher than the allowable limit for the equipment, then it is possible to increase the temperature of the workpiece (warm and hot pressing) until the required degree of drawing ⁇ is reached.
  • a significant increase in the temperature of the solid billet, approaching the solidus temperature Ts of the alloy can lead to the appearance of defects similar to hot cracks during casting [1, 2].
  • deformation zone arising by the direct compression method [1] with average values of the friction coefficient and the presence of only a slight heterogeneity of the mechanical properties of the metal over the cross section (for example, the presence of cold peripheral layers).
  • the deformation zone extends over the entire length of the workpiece, and the flow of the inner layers occurs with some advance of the outer ones, i.e. the deformable volume is conditionally divided into two parts - internal and external. Due to the delaying effect of friction on the container walls and the greater rigidity of the peripheral layers of the metal, the outer layers flow more slowly than the inner ones.
  • the closest analogue to the invention of the proposed method can be considered the method described in [4], which includes deformation of the thixo harvesting, heated to a state of suspension, in a pre-heated press tool with a punch and a matrix.
  • the prototype method does not have a mode of controlled superplasticity of the solid phase of the processed thix harvesting, and because of this, the characteristics of the finished products are heterogeneous and not high enough.
  • the technical problem to which the proposed method is aimed is to obtain high-quality finished products with a homogeneous fibrous morphology of alloy base crystals, increasing productivity by creating conditions for a two-phase flow of suspended metal with partial outflow of the liquid phase from the outlet, and also reducing energy costs and process time .
  • thixo-pressing of a cylindrical thixo-preform including deformation of a thixo-preform heated to a state of suspension in a preheated press tool with a punch and a matrix, deformation of a suspended thixo-preform in the superplasticity mode of its solid phase with an initial fraction of the liquid phase of 40 ... 45% is carried out according to the scheme of direct pressing by a punch in a snap.
  • the equipment contains a conical matrix with a through axial cylindrical hole of a predetermined flow area and length.
  • the deformation of the thix workpiece along the axis of the matrix through its opening is carried out with the provision of thermal, force, kinematic and hydrodynamic conditions for the appearance of the deformation zone, in which the suspension flow in the area of the matrix opening turns into a two-phase flow with a uniform outflow of the liquid phase relative to the extruded suspension. This leads to a decrease in the fraction of the liquid phase in the extruded suspension to 10 ...
  • a two-phase flow with a uniform fibrous morphology of the crystals of the solid phase can also be sent further to a closed die for thix-stamping of shaped products.
  • Figure 1 equipment for implementing the pressing method in the superplasticity mode of the solid phase of a cylindrical thix harvesting
  • Fig.Z the microstructure of the pressostat formed after direct compression of the thix harvesting
  • Figure 4 the final microstructure in the initial section of the bar, extruded in a superplastic mode
  • the thixo pressing tool in the superplasticity mode of the cylindrical thix workpiece contains a bottom plate 1, a container 3, between which a spacer washer 2 is located coaxially with the plate’s cylindrical hole.
  • a sleeve 5 with a through cylindrical hole in which the conical matrix 4 is inserted with a given cross-sectional area of the pressing channel and its length commensurate with the equivalent diameter of the channel in order to comply with the isothermal condition of the thixo-pressing process. Heated to a state of suspension, in which the proportion of the liquid phase is 40 ...
  • the cylindrical thix workpiece is placed in the heated matrix along its axis, after which, with a punch 6. close the sleeve along the inner diameter and begin the deformation process.
  • the punch pressure on the thix harvesting the maximum pressure develops in the area of the cylindrical hole of the conical matrix, causing a uniform outflow of the liquid phase of the suspension to the walls of the container sleeve, directed against the main movement of the thix harvesting material.
  • the transition of the solid ⁇ phase to the state of superplastic flow occurs at a certain threshold pressure, which can be established by the fraction of the liquid phase and strain rate remaining at a level of 10 ... 20% calculated using a computer program for analyzing the phase composition and microstructure of materials using optical microscopy and quantitative image analysis. It is known that the strain rate is determined not by the speed of movement of the punch, but by the relative change in body size per unit time [1, p. 77]. The strain rate can be estimated by the formula
  • Dp is the average size of a spherical particle in the “nose” of the flow
  • the cause of the outflow of the liquid phase (in the diagram of Fig. 2, the outflow is conventionally shown by dashed arrows, and the main flow by continuous arrows) should be sought in the stress-strain state determined by the hydrostatic pressure component of the local volume of the suspension adjacent to the conical surface of the matrix.
  • a diagram of the pressing process is shown in FIG.
  • the arrows on the right highlight the sites on which the quantitative analysis of the eutectic component of the suspension and the degree of extraction of the solid phase was carried out) by the method of a quantitative analysis of the phase volume, it is easy to establish that the transition process of the formation of the fibrous structure of the material was about 0.05 s, and this process was accompanied by a simultaneous decrease in the proportion of the liquid phase of the suspension from 40% in the “nose” of the flow to 15% at the end of the transition process. A decrease in the proportion of the liquid phase in the cured material to 15% occurs in the direction opposite to the direction of movement of the rod.
  • the maximum flow rate and the maximum extraction of crystals of the solid ⁇ -phase are achieved at the conical surface of the matrix, but at the same time a layer of the liquid phase is formed at the cylindrical wall of the container sleeve, which reduces friction in the container sleeve and contributes to the formation of a homogeneous jet structure.
  • the initial shape of ⁇ -crystals of thix harvesting remains unchanged. According to external signs, the studied deformation zone resembles the deformation zone that occurs when back extrusion of a very ductile, uniformly heated solid metal with a low coefficient of friction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

L'invention peut être utilisée dans la fabrication d'articles dans lesquels les cristaux de la base de l'alliage ont une morphologie fibreuse, qui comprend le traitement d'une thixo-ébauche cylindrique selon des procédés de thixo-pressage et de thixo-poinçonnage en mode de phase solide superplastique. Le but de la présente invention est de fournir des articles de grande qualité dont les cristaux de la base de l'alliage possède une morphologie fibreuse uniforme, d'augmenter la productivité par la création de conditions d'écoulement en deux phases du métal en suspension avec un écoulement partiel de la phase liquide depuis l'ouverture de sortie, et de réduire la consommation énergétique ainsi que la durée du processus. La déformation de la thixo-ébauche en suspension en mode de phase solide superplastique lorsque la part initiale de la phase liquide est de 40 à 45% se fait selon un processus de pressage direct au poinçon dans un appareillage comprenant une matrice conique comportant des ouvertures cylindriques axiales traversantes ayant une section transversale et une longueur données. La déformation de la thixo-ébauche le long de l'axe de la matrice et à travers son ouverture se fait en établissant des conditions thermiques, de force, cinématiques et hydrodynamiques assurant la formation d'un foyer de déformation, et dans lesquelles, dans la zone de l'ouverture de la matrice, le flux de la suspension se transforme en deux phases avec un écoulement uniforme de la phase liquide par rapport à la suspension à extruder. On obtient ainsi une barre dont les cristaux de la phase solide ont une morphologie analogue et sont déformés jusqu'à 1000 % et plus.
PCT/RU2010/000771 2010-09-13 2010-12-21 Procédé de thixo-pressage d'une thixo-ébauche cylindrique en mode de phase solide superplastique WO2012036583A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2010137827/02A RU2444412C1 (ru) 2010-09-13 2010-09-13 Способ тиксопрессования цилиндрической тиксозаготовки в режиме сверхпластичности ее твердой фазы
RU2010137827 2010-09-13

Publications (1)

Publication Number Publication Date
WO2012036583A1 true WO2012036583A1 (fr) 2012-03-22

Family

ID=45831816

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RU2010/000771 WO2012036583A1 (fr) 2010-09-13 2010-12-21 Procédé de thixo-pressage d'une thixo-ébauche cylindrique en mode de phase solide superplastique

Country Status (2)

Country Link
RU (1) RU2444412C1 (fr)
WO (1) WO2012036583A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0935504B1 (fr) * 1996-11-04 2001-12-12 Alcan Technology & Management AG Procede de fabrication par extrusion d'une barre profilee en metal
RU2356677C2 (ru) * 2007-05-28 2009-05-27 Открытое акционерное общество Акционерная холдинговая компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" (ОАО АХК "ВНИИМЕТМАШ") Способ и устройство для тиксоштамповки цилиндрических заготовок
RU2357830C2 (ru) * 2007-07-02 2009-06-10 Открытое акционерное общество Акционерная холдинговая компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" (ОАО АХК "ВНИИМЕТМАШ") Способ и устройство для тиксоштамповки цилиндрических заготовок
EP2145704A1 (fr) * 2008-07-08 2010-01-20 Nederlandse Organisatie voor toegepast- natuurwetenschappelijk onderzoek TNO Procédé et appareil pour l'extrusion en continu de thixo-magnésium en produits d'extrusion en forme de plaques ou de barres

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0935504B1 (fr) * 1996-11-04 2001-12-12 Alcan Technology & Management AG Procede de fabrication par extrusion d'une barre profilee en metal
RU2356677C2 (ru) * 2007-05-28 2009-05-27 Открытое акционерное общество Акционерная холдинговая компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" (ОАО АХК "ВНИИМЕТМАШ") Способ и устройство для тиксоштамповки цилиндрических заготовок
RU2357830C2 (ru) * 2007-07-02 2009-06-10 Открытое акционерное общество Акционерная холдинговая компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" (ОАО АХК "ВНИИМЕТМАШ") Способ и устройство для тиксоштамповки цилиндрических заготовок
EP2145704A1 (fr) * 2008-07-08 2010-01-20 Nederlandse Organisatie voor toegepast- natuurwetenschappelijk onderzoek TNO Procédé et appareil pour l'extrusion en continu de thixo-magnésium en produits d'extrusion en forme de plaques ou de barres

Also Published As

Publication number Publication date
RU2444412C1 (ru) 2012-03-10

Similar Documents

Publication Publication Date Title
Chiba et al. Solid-state recycling of aluminium alloy swarf into c-channel by hot extrusion
Kiuchi et al. Mushy/semi-solid metal forming technology–Present and Future
CN101109061B (zh) 镁合金室温静液挤压变形强化工艺
Husain et al. An overview of thixoforming process
CN105705271A (zh) 生产高性能轴对称部件的方法和设备
Kang et al. The effect of die shape on the hot extrudability and mechanical properties of 6061 Al/Al2O3 composites
Li et al. Manufacture aluminum alloy tube from powder with a single-step extrusion via ShAPE
Matsumoto et al. New plastic joining method using indentation of cold bar to hot forged part
WO2012036583A1 (fr) Procédé de thixo-pressage d'une thixo-ébauche cylindrique en mode de phase solide superplastique
GB2530709A (en) Method to operate a hydraulic press for metal sheet forming
Liu et al. Greener manufacturing: Superplastic-like forming
Robbins et al. Extrusion Productivity–Billet Geometry/Container/Dummy Block
Hu et al. Researches on a novel severe plastic deformation method combining direct extrusion and shearings for AZ61 magnesium alloy based on numerical simulation and experiments
Chien et al. Extrusion productivity, Part I–billet geometry
CN100341640C (zh) 镁合金贫液半固态冲击挤压成形技术
Kang et al. Semisolid forming of thin plates with microscale features
Minghetti et al. Advanced forming techniques for aluminium-based metal matrix composites
Campbell Deformation processing
Comăneci Numerical analysis of back pressure equal channel angular pressing of an Al-Mg alloy
Xiaohui et al. Microstructure, texture and mechanical properties of extruded Mg-Zn-Zr Mg alloy profiles
Jiang et al. Numerical simulation and experiment validation of thixoforming angle frame of AZ61 magnesium alloy
Campillo et al. A357 Aluminium Cast Alloys for Extrusion Processes
Steinhoff et al. A new integrated production concept for semi-solid processing of high quality Al-products
KR100756422B1 (ko) 용탕압출법에 의한 금속선재의 제조방법 및 이를 위한 장치
Choy et al. Plane-strain backward extrusion of AZ31 magnesium alloy

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10857339

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10857339

Country of ref document: EP

Kind code of ref document: A1