Vacuum expendable pattern casting (V-EPC) molding method of large complex castings

A vacuum lost foam, complex technology, applied in the direction of casting molding equipment, molds, cores, etc., can solve the problem of complex modeling, up to several tons, ten tons or even twenty tons, and achieve the effect of good product quality

Active Publication Date: 2009-12-23
BOTOU QINGFENG MACHINERY
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  • Claims
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Problems solved by technology

However, the casting sand box with this structure is only suitable for small castings. For large castings, such as molds for stamping automobile bodies, their shapes are c

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  • Vacuum expendable pattern casting (V-EPC) molding method of large complex castings
  • Vacuum expendable pattern casting (V-EPC) molding method of large complex castings

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[0022] The present invention will be described in further detail below:

[0023] When the base of a stamping model is produced, the outer dimension of the casting is 1m×2m×6m, and the weight is 15 tons. There are multiple grooves on the base, and connecting ribs are formed between the grooves. When using vacuum lost foam casting, foam is used to pre-make a real mold consistent with the base. The real mold is generally manufactured by the design unit. After reaching the foundry, the real mold is first painted and dried for a total of two times ; Then bury the box, vibrate the shape, vacuumize after the shape is completed, and then start pouring.

[0024]Among them, the molding sand box adopts a combined sand box with a movable bottom and a movable cover. The sand box includes three parts: the sand box bottom, the sand box body, and the upper suction lifting pressure bar. The sand box bottom is set under the sand box body and moves with the sand box body. Connect and cooperate with ...

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Abstract

The invention discloses a vacuum expendable pattern casting (V-EPC) molding method of large complex castings. A flask for molding comprises three parts including flask bottom, a flask body and an up draught pneumatic hoist press bar; each part is provided with an independent vacuum air duct. The molding procedures comprise the following steps: filling sand and carrying out vibrating molding on the bottom of the expendable pattern, turning over the flask, removing a supporting plate and a tire plate rack and placing the up draught pneumatic hoist press bar, filling the sand, exerting pressure for vibrating molding, sealing the flask and carrying out pouring after vacuumizing. The parts with blind holes and grooves are filled with resin sand and core irons and a floating crane is employed to fix the core irons; local compaction is carried out on loose parts. Being adopted, the method of the invention ensures compact and uniform molding sand, solves the difficult problems frequently appearing in the process of V-EPC of large castings, including sand crushing, sand drop, sand inclusion and deformation, can ensure the accuracy of the blind holes, deep grooves and entire castings, can enable the pattern to be almost free from floating and deformation in the process of vibration and can produce high quality large complex castings.

Description

technical field [0001] The invention relates to a casting method, in particular to a molding method for casting large and complex castings by using vacuum lost foam. Background technique [0002] Vacuum lost foam casting technology is a new type of casting technology developed in recent decades. The process of vacuum lost foam casting includes foam forming-assembly model bundle-painting-drying-embedding box, vibration molding-vacuumizing-casting under negative pressure (foam type vaporization)-casting solidification cooling-sand cleaning. Vacuum lost foam casting belongs to solid casting. Its model is generally formed by foam, and the shape of the model is the same as that of the casting. After the pretreatment of the model assembly is completed, place it on the sand in the sand box, and then fill the box with dry molding sand. After the sand fills the sand box, use a vibrating machine to vibrate the sand and fill the sand to the top of the model. Every corner, and then co...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C9/22
Inventor 韩素喜
Owner BOTOU QINGFENG MACHINERY
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