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WO2018039852A1 - Procédé de moulage destiné au moulage monolithique de corps de soupape à voies multiples - Google Patents

Procédé de moulage destiné au moulage monolithique de corps de soupape à voies multiples Download PDF

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Publication number
WO2018039852A1
WO2018039852A1 PCT/CN2016/097127 CN2016097127W WO2018039852A1 WO 2018039852 A1 WO2018039852 A1 WO 2018039852A1 CN 2016097127 W CN2016097127 W CN 2016097127W WO 2018039852 A1 WO2018039852 A1 WO 2018039852A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
casting
main
valve body
sand
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2016/097127
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English (en)
Chinese (zh)
Inventor
丁先华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to PCT/CN2016/097127 priority Critical patent/WO2018039852A1/fr
Publication of WO2018039852A1 publication Critical patent/WO2018039852A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings

Definitions

  • the invention relates to the technical field of engineering machinery equipment manufacturing, in particular to a method for casting a whole multi-way valve body casting.
  • the product manufactured by the manufacturing method is a key component of the hydraulic control system of the large excavator, and is the development direction of the hydraulic control system of the large excavator today.
  • An excavator also known as a digging machine, is a earthmoving machine that uses a bucket to excavate materials above or below the surface of the carrier and into the transport vehicle or to the stockyard. From the development of construction machinery in recent years, the development of excavators is relatively fast, and excavators have become one of the most important construction machinery in engineering construction.
  • the hydraulic system consists of hydraulic pumps, control valves, hydraulic cylinders, hydraulic motors, pipelines, fuel tanks, etc.
  • the hydraulic transmission system transmits the power of the engine to the hydraulic pressure through hydraulic pumps.
  • Actuators such as motors and hydraulic cylinders act to drive the work unit to complete various operations.
  • the hydraulic valve is a key component of the hydraulic system.
  • the hydraulic valve structure and precision requirements of the large excavator are very high, especially for some multi-oil valves.
  • the temperature rises rapidly during the working process, and the temperature is too high, resulting in the hydraulic valve not working stably.
  • the amount of wear is large, the pressure fluctuation or shock vibration of the hydraulic system will cause the valve body to leak, and the pressure is ⁇ 35Mpa, the pressure is more likely to leak under the high pressure working condition, the hydraulic valve body casting shrinkage, shrinkage, internal air hole casting, etc.
  • the problem is often a defect in the product, requiring a higher internal tissue compactness and a straightness of the main valve hole casting blank of less than 1.0 mm.
  • the object of the present invention is to provide an integral multi-way valve for the defects existing in the prior art.
  • Casting method of valve body casting, casting valve body casting control main valve hole casting blank straightness is less than or equal to 1.0 mm, ensuring valve hole straightness, solving cast casting shrinkage, shrinkage, internal air hole and other casting defects, especially casting internal micropores
  • the defect is to improve the internal organization compactness to achieve no leakage under the high pressure working condition with rated pressure ⁇ 35Mpa.
  • the present invention provides a method for casting an integral multi-way valve body casting, comprising the following steps:
  • the main core is made of sand, and the steel bar is placed in the main hole of the main core as a core bone, and the vent needle is placed in the mold in sequence, and the vent needle is rotated one turn after the sand is finished, after the main core is shaped, Demolding with a spray release agent;
  • valve body casting using the side thin gate on both sides of the simultaneous casting process, the use of 120mm diameter, 220mm high riser riser, placed special cold iron on the bottom of the shell;
  • the pouring temperature in S7 ranges from 1390 ° C to 1430 ° C
  • the pouring time ranges from 18 s to 25 s
  • the tapping temperature ranges from 1510 ° C to 1530 ° C.
  • stirring is carried out in the riser to prevent the formation of a small molten pool which cannot be complemented, and the feeding effect is achieved.
  • an asbestos cloth having a shrinkage gap of 1.5 mm is placed at the core of all the main holes, and when the casting is expanded, there will be a gap of 1.5 mm to prevent the bending of the main hole, and in combination with the action of the special cold iron,
  • the straightness of the main hole is within 1.0 mm.
  • S2 further includes using a water-based paint, and adding graphite powder to the water-based paint to prepare a paint having a Baume degree range of 35° Bé-42° Bé.
  • the heating temperature of the main core in S2 is 150°C-170°C, the sanding pressure is not less than 0.6MPa, the sanding time is not less than 6s, and the curing time is not less than 120s.
  • an asbestos cloth with a shrinkage gap of 1.5mm is placed at the core of all the main holes. When the casting expands, there will be a gap of 1.5 to prevent the main hole from being bent. The role of iron, thus ensuring the straightness of the main hole is within 1.0mm.
  • the invention provides a method for casting an integral multi-way valve body casting, comprising the following steps:
  • the main core is made of high-strength HAGD290 type sand. During the production, the steel bar is placed in the main hole of the main core as the core bone, and the ventilation needle is placed in the mold in order, and the vent needle is rotated once after the sand is completed. After the main core is shaped, the release agent is used for demolding;
  • valve body casting using the side thin gate on both sides of the simultaneous casting process, using a 120mm diameter, 220mm high riser, placing special cold iron on the bottom of the shell, changing the solidification sequence of molten iron, increasing the solidification speed of the bottom molten iron;
  • the pouring temperature range of the valve body pouring is 1390 ° C - 1430 ° C
  • the pouring time range is 18 s -25 s
  • the tapping temperature range is 1510 ° C - 1530 ° C.
  • stirring is carried out in the riser to prevent the formation of a small molten pool which cannot be complemented, and the feeding effect is achieved.
  • an asbestos cloth having a shrinkage gap of 1.5 mm is placed at the core of all the main holes, and when the casting is expanded, there will be a gap of 1.5 mm to prevent the bending of the main hole, and in combination with the action of the special cold iron,
  • the straightness of the main hole is within 1.0 mm.
  • the preparation of the main core further includes using a HA377 water-based paint, and adding graphite powder to the water-based paint to prepare a paint having a Baume degree range of 35° Bé-42° Bé.
  • the heating temperature in the main core is 150° C.-170° C.
  • the sanding pressure is not less than 0.6 MPa
  • the sanding time is not less than 6 s
  • the curing time is not less than 120 s.
  • an asbestos cloth with a shrinkage gap of 1.5mm is placed at the core of all the main holes. When the casting expands, there will be a gap of 1.5 to prevent the main hole from being bent. The role of iron, thus ensuring the straightness of the main hole is within 1.0mm.

Landscapes

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

Abstract

L'invention concerne un procédé de moulage destiné à un moulage de corps de soupape à voies multiples monolithique, le procédé comprenant les étapes suivantes : la préparation d'un moule de production de noyau, et la vérification et le nettoyage du moule; la production d'un noyau principal au moyen de sable de fonderie, et le démoulage par pulvérisation d'un agent de démoulage après la mise en forme du noyau principal; la préparation de petits noyaux, et le perçage de trous d'échappement dans les petits noyaux; l'élimination du flash sur le noyau principal et les petits noyaux, et le retrait d'une buse de transition sur le noyau principal; la fixation du noyau principal par un outillage de préparation de liaison de noyau de sable, d'abord l'assemblage du petit noyau d'un côté, puis l'assemblage du petit noyau de l'autre côté; le montage du noyau de sable assemblé dans un corps de coque; et le moulage d'un corps de soupape; la réalisation d'un processus de coulage par l'intermédiaire d'une porte mince latérale sur deux côtés simultanément, à l'aide d'une colonne montante exothermique de 120 mm de diamètre et de 220 mm de haut, et le placement d'un fer de refroidissement dédié au niveau de la face inférieure du corps de coque. Le moulage de corps de soupape à voies multiples monolithique produit par ce procédé de moulage présente les avantages d'une linéarité d'un trou de soupape principal de l'ébauche de moulage qui est régulé pour être inférieur ou égal à 1,0 mm, assurant la linéarité du trou de soupape, résolvant les problèmes de retassure, de porosité de retrait, de trous de gaz internes et d'autres défauts de moulage, en particulier des défauts de micropores de la pièce moulée, et améliorant la compacité de la structure interne.
PCT/CN2016/097127 2016-08-29 2016-08-29 Procédé de moulage destiné au moulage monolithique de corps de soupape à voies multiples Ceased WO2018039852A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2016/097127 WO2018039852A1 (fr) 2016-08-29 2016-08-29 Procédé de moulage destiné au moulage monolithique de corps de soupape à voies multiples

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2016/097127 WO2018039852A1 (fr) 2016-08-29 2016-08-29 Procédé de moulage destiné au moulage monolithique de corps de soupape à voies multiples

Publications (1)

Publication Number Publication Date
WO2018039852A1 true WO2018039852A1 (fr) 2018-03-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2016/097127 Ceased WO2018039852A1 (fr) 2016-08-29 2016-08-29 Procédé de moulage destiné au moulage monolithique de corps de soupape à voies multiples

Country Status (1)

Country Link
WO (1) WO2018039852A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114700682A (zh) * 2020-09-09 2022-07-05 北京盛维华科技有限公司 一种液压多路阀铸造工艺

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002060616A1 (fr) * 2001-01-31 2002-08-08 Disa Industries A/S Procede et machine permettant de fabriquer des moules en sable, ensemble de coulee de descente, et plaque de support a utiliser pour ladite fabrication
CN1519069A (zh) * 2003-09-01 2004-08-11 董立春 一种生产内腔无砂铸铁散热器的方法
JP2011020127A (ja) * 2009-07-14 2011-02-03 Mazda Motor Corp カムシャフトの製造方法及びカムシャフトを鋳造する鋳型の鋳型構造
CN105195670A (zh) * 2015-10-09 2015-12-30 宁夏共享化工有限公司 一种防止脉纹缺陷的水基流涂涂料的生产方法
CN105772646A (zh) * 2016-04-22 2016-07-20 南通华东油压科技有限公司 一种大型装载机液压阀体铸件模具及制造方法
CN105903910A (zh) * 2016-04-22 2016-08-31 南通华东油压科技有限公司 一种整体多路阀阀体铸件铸造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002060616A1 (fr) * 2001-01-31 2002-08-08 Disa Industries A/S Procede et machine permettant de fabriquer des moules en sable, ensemble de coulee de descente, et plaque de support a utiliser pour ladite fabrication
CN1519069A (zh) * 2003-09-01 2004-08-11 董立春 一种生产内腔无砂铸铁散热器的方法
JP2011020127A (ja) * 2009-07-14 2011-02-03 Mazda Motor Corp カムシャフトの製造方法及びカムシャフトを鋳造する鋳型の鋳型構造
CN105195670A (zh) * 2015-10-09 2015-12-30 宁夏共享化工有限公司 一种防止脉纹缺陷的水基流涂涂料的生产方法
CN105772646A (zh) * 2016-04-22 2016-07-20 南通华东油压科技有限公司 一种大型装载机液压阀体铸件模具及制造方法
CN105903910A (zh) * 2016-04-22 2016-08-31 南通华东油压科技有限公司 一种整体多路阀阀体铸件铸造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114700682A (zh) * 2020-09-09 2022-07-05 北京盛维华科技有限公司 一种液压多路阀铸造工艺

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