Method for producing large-size disc-type cast iron parts by means of lost foam casting

A technology of lost foam casting and casting production, which is applied to casting molding equipment, molds, mold components, etc. It can solve problems such as slag holes, improper selection of beads, and deformation of casting surface dimensions, so as to prevent deformation and improve surface quality. The effect of quality and stability assurance

Inactive Publication Date: 2018-01-12
FIRST TRACTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a method for producing large-size disc-type iron castings by lost foam casting, that is, by implementing "bead selection, pre-foaming, drying and aging, model making, Model drying, joint combination, dipping and drying, combination splitting, dry sand vibration, negative pressure suction, negative pressure pouring, removal and cleaning” technical solutions can not only solve the problem of beads in the lost foam model in the casting production process Problems such as gaps on the surface of the casting and unqualified dimensions due to deformation caused by improper selection, insufficient model strength, large gas generation, and large deformation can also solve problems such as insufficient combustion of the casting model, unstable filling of the molten iron, Problems such as slag holes, shrinkage porosity, and shrinkage cavities caused by uneven solidification of molten iron and insufficient holding time

Method used

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  • Method for producing large-size disc-type cast iron parts by means of lost foam casting
  • Method for producing large-size disc-type cast iron parts by means of lost foam casting
  • Method for producing large-size disc-type cast iron parts by means of lost foam casting

Examples

Experimental program
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Effect test

Embodiment 1

[0087] An enterprise needs to produce 6 pieces of friction discs 11, such as Figure 7 , Figure 8 As shown, the diameter of the outer circle is φ1050mm, the diameter of the inner circle is 640mm, the thickness is 32mm, and the thin-wall heat dissipation part 11a is 5mm.

[0088] The manufacturer of the STMMA beads used in this example - Zhejiang Kester New Material Co., Ltd.; the manufacturer of the hot melt adhesive used - Huachun Hot Melt Adhesive Products Co., Ltd.; the manufacturer of the special paint for lost foam used - Suizhou Hongsheng Industry and Trade Co., Ltd.; the steam pre-foaming machine used, model RO-YF, the manufacturer - Hebei Ruiou Lost Foam Technology Co., Ltd.; the model forming machine used, the manufacturer - Yantai Sifang Foundry Equipment Engineering Co., Ltd.; Paint mixer used: model GFS-2N-Y, manufacturer—Shanghai Puzhong Chemical Machinery Co., Ltd. In addition, the lost foam runners, sprue cups, wooden strips, profiling cold irons, and metal f...

Embodiment 2

[0118] In order to further verify the feasibility of the technical solution of the present invention, a certain enterprise subsequently produced 6 friction discs 11 and tested them.

[0119] The STMMA beads used in the second embodiment, hot melt adhesive, special paint for lost foam, steam pre-foaming machine, model forming machine, paint mixer, profiling cold iron, metal forming mold, sand box, vibrating table, Baume degree The tester, coating box, hand saw, and lost foam vacuuming system are the same as in Example 1. In addition, the used lost foam runners, sprue cups, and wooden strips have been re-completed and have been configured on the job site.

[0120] Next, continue by Figure 7 , Figure 8 and continue to refer to Figure 4 , Figure 5 , Figure 6 , illustrating a method of lost foam casting of a large-size disc type iron casting in the present invention—the friction disc 11, the steps are as follows:

[0121] 1) Bead selection: According to the wall thickness...

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Abstract

The invention discloses a method for producing large-size disc-type cast iron parts by means of lost foam casting, and belongs to the technical field of lost foam casting. By implementing the technical scheme comprising the steps of bead selecting, prefoaming, drying and curing, model making, model drying, connecting and combining, staining and drying, combination splitting, dry sand compacting, negative-pressure sucking, negative-pressure pouring and taking out and cleaning, the problems that the cast part surface has gaps due to the fact that a lost foam model is improper in bead selection,insufficient in model strength and large in gas generation volume and deformation in the casting production process, and the size is unqualified due to deformation are solved, and the problems such asslag blowholes, shrinkage porosity and shrinkage cavities which are generated due to the fact that cast part model combustion is insufficient, iron liquid model filling is unstable, iron liquid solidification is unbalanced, and the pressure maintaining time is insufficient are solved. According to the method, conception is novel, layers are clear, operation is easy and convenient, and implementation is easy; in addition, the product parts produced through casting are high in stability and production rate and have the propagable practical value.

Description

technical field [0001] The invention belongs to the technical field of lost foam casting, and relates to a method for producing iron castings by using lost foam casting, in particular to a method for producing large-size disc-type iron castings by using lost foam casting. Background technique [0002] It is known that compared with the traditional sand casting technology, the lost foam casting technology can effectively control the defects of the castings and improve the dimensional accuracy and quality of the castings, and it is convenient for production management and easy to adjust the process. In addition, the lost foam casting system uses dry sand molding , Therefore, it is easy to recycle the dry sand for modeling and many other advantages. [0003] The large-size disc-type iron castings in the present invention refer to such iron castings with a diameter > 1000 mm and a wall thickness ≤ 35 mm, that is, iron castings with large diameters and thin walls. At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/22B22C9/03
Inventor 冯志明蔡安克李锋军郭亚辉吕乐华李自君范随长张杰琼赵振凯段华荣
Owner FIRST TRACTOR
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