WO2018053939A1 - Procédé de moulage par extrusion d'une pièce - Google Patents

Procédé de moulage par extrusion d'une pièce Download PDF

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Publication number
WO2018053939A1
WO2018053939A1 PCT/CN2016/108278 CN2016108278W WO2018053939A1 WO 2018053939 A1 WO2018053939 A1 WO 2018053939A1 CN 2016108278 W CN2016108278 W CN 2016108278W WO 2018053939 A1 WO2018053939 A1 WO 2018053939A1
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WO
WIPO (PCT)
Prior art keywords
extrusion
casting
punch
mold
extrusion punch
Prior art date
Application number
PCT/CN2016/108278
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English (en)
Chinese (zh)
Inventor
朱权利
陈家坚
李元元
张卫文
吴资湧
Original Assignee
华南理工大学
广东粤海华金科技股份有限公司
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Application filed by 华南理工大学, 广东粤海华金科技股份有限公司 filed Critical 华南理工大学
Publication of WO2018053939A1 publication Critical patent/WO2018053939A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging

Definitions

  • An object of the present invention is to provide a method for extrusion casting of a casting which can improve the pressure distribution state, and is advantageous for molding of a portion having a large thickness and improvement of the overall performance of the casting.
  • a method for extrusion casting of a casting which can realize secondary direct extrusion in the same direction for a casting having uneven thickness, the casting comprising a first portion and a second portion, the thickness of the first portion being smaller than the thickness of the second portion, The method includes the following steps:
  • the pressing force of the first pressing punch to the first portion is maintained at f1.
  • the first extrusion punch is continuously pressed against the melt of the first member to prevent deformation due to pressurization of the second extrusion punch, thereby ensuring product quality.
  • the first extrusion punch and the second extrusion punch are driven by the main hydraulic cylinder to press the melt.
  • step (5) before the mold is opened, the auxiliary hydraulic cylinder is first released, and the main hydraulic cylinder is released again.
  • the mold presses the melt of the first portion and the second portion for the first time, and the first extrusion specific pressure is 50-150 MPa.
  • the second extrusion punch presses the melt of the second portion a second time, and the second extrusion pressure is 60-150 MPa.
  • the dwell time t1 is 30-80 s
  • the dwell time t2 is 30-70 s.
  • the casting is a turbine
  • the first part is a rib plate
  • the second part is a turbine rim
  • the first extrusion punch is an upper core
  • the second extrusion punch is an upper die ring arranged around the upper core.
  • the thickness of the rib position is thinner than the thickness of the turbine rim position.
  • Fig. 3 is a schematic view showing the structure of a mold according to an embodiment of the present invention.
  • a casting method for castings can achieve secondary direct extrusion in the same direction for a casting having uneven thickness, the casting including a first portion and a second portion, and the thickness of the first portion is second.
  • the thickness of the portion is small, and the method includes the following steps:
  • the method adopts secondary direct extrusion of the casting in the same direction in the vertical direction, and in the solidification process of the casting, according to the order of solidification of different parts of the casting, the secondary extrusion is carried out in stages, so that the pressing pressure is in the process of solidification of the alloy.
  • Reasonable distribution improve the pressure distribution state, improve the local extrusion specific pressure and pressure effective action time, effectively solve the problems of dense structure and large grain size in parts with large thickness and small thickness, which is beneficial to thick parts. Improve the overall performance of molding and castings, improve product quality and yield.
  • the casting is a turbine
  • the first part is a rib
  • the second part is a turbine rim
  • the first extrusion punch is an upper core
  • the second extrusion punch is arranged around the upper core. Mould ring.
  • the thickness of the rib position is thinner than the thickness of the turbine rim position.
  • the mold cavity has a preheating temperature of 150 to 250 °C.
  • the first extrusion punch and the second extrusion punch are driven by the main hydraulic cylinder to press the melt.
  • the main hydraulic cylinder is pressurized to a certain pressure and held for 30-80 s, and the first extrusion is performed by the first extrusion punch and the second extrusion punch, and the first extrusion is performed.
  • the specific pressure is 50-150 MPa.
  • the squeeze casting method specifically includes the following steps:
  • the main hydraulic cylinder drives the upper core and the upper mold ring to be closed downward, and the descending speed is 8 mm/s;
  • the lifting hydraulic cylinder drives the upper mold to move upward to open the mold
  • the worm wheel blank produced by the method of the invention has the advantages of compact structure, excellent mechanical properties, small machining allowance, and the like, and the method of the invention has high automation degree and high utilization rate of raw materials. Improve the quality of castings while reducing production costs, suitable for mass production, with positive technical application and promotion value.
  • the second pressing punch 612 presses down the thicker part of the casting, and the auxiliary driving cylinder 50 pressurizes and holds the pressure, so that the solidified part with thicker thickness of the casting is still solidified under high pressure, so as to achieve the second extrusion of the casting. .
  • the vertical extrusion casting machine The two large pressures are directly squeezed and cast in the same direction in the vertical direction to ensure that the uneven thickness castings are sequentially solidified under the effective extrusion specific pressure, thereby improving product quality and yield.
  • the two large pressure extrusion drive cylinders are connected in series, the overall structure of the casting machine is compact, small in size, low in manufacturing cost, and easy to install and maintain.
  • the extrusion casting machine sets n driving cylinders according to actual needs, and the movable template 20 is set to n-1 according to actual needs, according to the solidification of different parts of the casting. In order, the extrusion is performed in stages.
  • the first extrusion punch 611 is an upper core
  • the second extrusion punch 612 is an upper mold ring disposed around the upper core
  • the upper mold 610 further includes an upper mold base. 613
  • the upper mold frame 613 is connected to the movable die plate 20, and the upper mold core is fixed on the upper mold frame 613.
  • the lower mold 620 includes a lower mold sleeve 621 fixed on the second template 30, and is fixed on the lower mold sleeve 621.
  • the core 622 and the lower core 622 are provided with a cavity 623 matched with the upper core and the upper mold ring, so as to be suitable for casting of a casting having a small center thickness and a large outer ring thickness, which is particularly suitable for casting of a turbine and solving the turbine.
  • the outer ring portion is less problematic than the dense structure of the rib portion and the coarse grain.
  • the mold can also be set to other forms depending on the shape of the casting.
  • the vertical squeeze casting machine further includes a top plate 510 that is coupled to the piston rod of the sub-drive cylinder 50, and a second extrusion punch 612 that is coupled to the top plate 510.
  • the piston rod of the secondary drive cylinder 50 is coupled to the second extrusion punch 612 by a top plate 510 for ease of installation and maintenance.
  • a guide post 70 is connected between the first template 10 and the second template 30, and the movable die plate 20 is provided with a guide hole (not shown) that cooperates with the guide post 70.
  • the guide post 70 guides the movement of the movable die plate 20, so that the movable die plate 20 is more stable during the up and down movement, avoiding the occurrence of offset, and also making the clamping precision higher.
  • the guide post 70 has two groups, and the two sets of guide posts are arranged one behind the other, and each set of guide columns includes two guide posts 70, so that the movable template 20 is more balanced and stable during the up and down movement.
  • the vertical extrusion casting machine further includes a driving mechanism 80 for driving the movable die plate 20 to move up and down, and the driving mechanism 80 is disposed on the first template 10.
  • the driving mechanism 80 drives the movable die plate 20 to move upward to open the mold, and the auxiliary driving cylinder 50 drives the top plate 510 to eject the casting, which makes the mold opening more convenient and makes the overall structure of the vertical extrusion casting machine more compact.
  • the drive mechanism 80 is a lift cylinder, and the piston rod of the lift cylinder is connected to the movable die plate 20.
  • the main drive cylinder 40 and the sub drive cylinder 50 are also hydraulic cylinders, and the main drive cylinder 40, the sub drive cylinder 50, and the drive mechanism 80 may also be in other drive forms as needed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Forging (AREA)

Abstract

L'invention concerne un procédé de moulage par extrusion d'une pièce. Le procédé comprend les étapes suivantes : le préchauffage d'un moule et le versement d'un matériau fondu dans une cavité de formation du moule ; un moule supérieur (610) se déplace vers le bas vers un moule inférieur (620) pour fermer le moule, un premier poinçon d'extrusion (611) réalise ensuite une extrusion sur le matériau fondu d'une première partie, et un second poinçon d'extrusion (612) réalise une extrusion sur le matériau fondu d'une seconde partie ; le premier poinçon d'extrusion (611) et le second poinçon d'extrusion (612) continuent à se déplacer vers le bas, augmentent la pression d'extrusion exercée sur le matériau fondu par le premier poinçon d'extrusion (611) et le second poinçon d'extrusion (612) à f1 et maintiennent la pression pendant une durée de t1 ; le second poinçon d'extrusion (612) continue à se déplacer vers le bas et augmente la pression d'extrusion exercée par le second poinçon d'extrusion (611) sur le matériau fondu de la seconde partie, la pression d'extrusion exercée par le second poinçon d'extrusion (611) étant augmentée à f2 et maintenue pendant une durée de t2, où f2 > f1 ; et l'ouverture du moule pour éjecter une pièce à travailler. Le procédé applique une extrusion directe en deux étapes le long de la même direction sur la pièce et réalise, en fonction d'une séquence de solidification d'une pièce, une action de pression en deux étapes dans des étapes séparées pendant que la pièce se solidifie. L'invention améliore la distribution de pression, la qualité du produit et le rendement.
PCT/CN2016/108278 2016-09-23 2016-12-01 Procédé de moulage par extrusion d'une pièce WO2018053939A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610848867.1 2016-09-23
CN201610848867.1A CN106180643B (zh) 2016-09-23 2016-09-23 铸件的挤压铸造方法

Publications (1)

Publication Number Publication Date
WO2018053939A1 true WO2018053939A1 (fr) 2018-03-29

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PCT/CN2016/108278 WO2018053939A1 (fr) 2016-09-23 2016-12-01 Procédé de moulage par extrusion d'une pièce

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CN (1) CN106180643B (fr)
WO (1) WO2018053939A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106180644B (zh) * 2016-09-23 2018-11-16 广东粤海华金科技股份有限公司 串缸立式挤压铸造机
CN109940150A (zh) * 2019-05-05 2019-06-28 苏州品汇精密电子有限公司 一种铝合金压铸件加工调节型压合装置
CN112846144B (zh) * 2021-01-07 2022-10-28 宁波豪若汽车零部件制造有限公司 一种汽车发动机缸盖的压铸设备及其加工方法
CN113770326B (zh) * 2021-07-30 2023-09-26 金榀精密工业(苏州)有限公司 模芯调节式压铸成型结构

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Publication number Priority date Publication date Assignee Title
JPS54112766A (en) * 1978-02-24 1979-09-03 Kobe Steel Ltd Direct forging apparatus for flanged long pipe
CN201147834Y (zh) * 2008-01-31 2008-11-12 宁波合力模具科技股份有限公司 带有二次挤压机构的压铸模
RU2459683C1 (ru) * 2011-02-25 2012-08-27 Открытое акционерное общество Акционерная холдинговая компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" (ОАО АХК "ВНИИМЕТМАШ") Способ изотермической штамповки заготовок с глобулярной структурой
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CN103551543A (zh) * 2013-11-01 2014-02-05 张家港市昊天金属科技有限公司 合金型材挤压成型装置
CN203649367U (zh) * 2013-11-07 2014-06-18 苏州三电精密零件有限公司 一种汽车空调压缩机壳体铝制件的铸造模具
CN205289707U (zh) * 2015-12-15 2016-06-08 天津德盛镁汽车部件有限公司 模具成型用挤压抽芯装置

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CN106180643A (zh) 2016-12-07

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