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A lost foam casting method

A lost foam and sand box technology, applied in the field of foundry modeling, can solve the problems of insufficient compactness and low compliance rate of castings, and achieve the effects of high compactness, improved compliance rate and guaranteed integrity.

Active Publication Date: 2018-07-20
沛县昌运机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention intends to provide a casting method of lost foam to solve the problem of low compliance rate of castings due to insufficient compactness between molding sand and lost foam

Method used

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  • A lost foam casting method
  • A lost foam casting method

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Embodiment Construction

[0013] The present invention will be described in further detail below by means of specific embodiments:

[0014] The reference signs in the drawings of the description include: sand box 1 , molding sand 2 , body 3 , rope groove 4 , sand bag 5 , expansion block 6 , and hanging ring 7 .

[0015] The embodiment is basically as attached figure 1 , figure 2 Shown: a lost foam casting device used in a lost foam casting method, including a sand box 1, molding sand 2 and an elevator sheave-like lost foam, the molding sand 2 is filled with the sand box 1, the lost foam is placed inside the molding sand 2, and the sand The box 1 is connected with a filling layer matching the rope groove 4 through an iron chain. The filling layer includes a sand layer and a sand bag 5 in turn from the inside to the outside. There are several sets of preheated expansion blocks 6 inside the molding sand 2. Each set The expansion blocks 6 are arranged opposite to the sandbags 5, and a support rod is fix...

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Abstract

The invention discloses a lost-form casting method, which comprises the following steps: (1) putting the lost-form mold of the elevator rope sheave after the coating and drying into a moulding flask; step (2) filling sand into the moulding flask to complete molding; (3) vacuuming the moulding flask and pouring liquid metal. Between the step (1) and the step (2), a rope groove of the lost-form mold is embedded with a sand layer, a sand bag is placed in the moulding flask; the lost-form mold embedded in the sand layer is placed into the moulding flask, so that the sand bag is abutted against the sand layer; moulding sand is filled into the moulding flask, a plurality of expansion blocks are arranged in the moulding flask and correspond to the sand bag; the expansion blocks and the moulding flask are supported by the support rods. The lost-form casting method mainly solves the problem of low standard rate of castings due to low fitting degree of the moulding sand and the lost-form mold.

Description

technical field [0001] The invention belongs to the field of casting modeling, and in particular relates to a sand mold or similar casting molds for molding castings. Background technique [0002] Lost foam casting is a full-type casting of foam plastic molds using binder-free dry sand combined with vacuum technology. It combines foam models similar in size and shape to castings to form model clusters. After brushing and drying refractory coatings, they are buried in Vibration molding in molding sand, pouring under negative pressure, gasification of the model, liquid metal occupying the position of the model, solidification and cooling to form a new casting method of castings. [0003] At present, the compliance rate of the produced castings is low. The main reason is that the fit between the molding sand and the foam model is not high during the casting manufacturing process, especially for the bending parts, grooves and holes of the castings. During the production process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C9/28
CPCB22C9/046B22C9/28
Inventor 张海学
Owner 沛县昌运机械制造有限公司
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