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Lost foam casting method

A lost foam casting and white mold technology, which is applied to casting molding equipment, molds, mold components, etc., can solve the problems of short processing cycle and sand box collapse, achieve mechanical properties enhancement, eliminate residual stress, and save production. cost effect

Inactive Publication Date: 2015-09-02
HANZHONG YANHANG PRECISION MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a lost foam casting method, which has a short processing cycle, avoids the process of separately performing failure treatment on castings in the later stage, and solves the problem of easily occurring sand box collapse existing in the existing lost foam casting method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Step 1: Make a foam plastic white mold, specifically follow the steps below:

[0048] Step 1.1: pre-foaming EPS beads;

[0049] Step 1.2: Place the EPS beads pre-foamed in step 1.1 in the curing chamber for curing, and the curing time is 4 hours;

[0050] Step 1.3: Fill the matured EPS beads in step 1.2 into the cavity of the metal mold, heat, expand and fuse with each other to form a white foam mold;

[0051] Step 2: Dry the foam plastic white mold made in step 1. The specific method of drying is: first place the foam plastic white mold at room temperature for 3 days, then place it in a drying room for 4 days, The temperature of the drying room is 20°C and the humidity is 10%;

[0052] Step 3: Repair and form the white foam mold after drying in step 2 to form a model cluster. Use the special stick glue for lost foam and the matching stick glue gun when assembling the shape;

[0053] Step 4: carry out hang coating to the model cluster formed in step 3;

[0054] Step...

Embodiment 2

[0063] Step 1: Make a foam plastic white mold, specifically follow the steps below:

[0064] Step 1.1: pre-foaming EPS beads;

[0065] Step 1.2: Place the EPS beads pre-foamed in step 1.1 in the curing chamber for curing, and the curing time is 20 hours;

[0066] Step 1.3: Fill the matured EPS beads in step 1.2 into the cavity of the metal mold, heat, expand and fuse with each other to form a white foam mold;

[0067] Step 2: Dry the foam plastic white mold made in step 1. The specific method of drying is: first place the foam plastic white mold at room temperature for 4 days, then put it in a drying room for 5 days, The temperature of the drying room is 30°C and the humidity is 30%;

[0068] Step 3: Repair and form the white foam mold after drying in step 2 to form a model cluster. Use the special stick glue for lost foam and the matching stick glue gun when assembling the shape;

[0069] Step 4: carry out hang coating to the model cluster formed in step 3;

[0070] Step ...

Embodiment 3

[0079] Step 1: Make a foam plastic white mold, specifically follow the steps below:

[0080] Step 1.1: pre-foaming EPS beads;

[0081] Step 1.2: Place the EPS beads pre-foamed in step 1.1 in the curing chamber for curing, and the curing time is 48 hours;

[0082] Step 1.3: Fill the matured EPS beads in step 1.2 into the cavity of the metal mold, heat, expand and fuse with each other to form a white foam mold;

[0083] Step 2: Dry the foam plastic white mold made in step 1. The specific method of drying is: first place the foam plastic white mold at room temperature for 5 days, then put it in a drying room for 3 days, The temperature of the drying room is 50°C and the humidity is 50%;

[0084] Step 3: Repair and form the white foam mold after drying in step 2 to form a model cluster. Use the special stick glue for lost foam and the matching stick glue gun when assembling the shape;

[0085] Step 4: carry out hang coating to the model cluster formed in step 3;

[0086] Step ...

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Abstract

The invention discloses a lost foam casting method which specifically includes the following steps: step 1: making a lost foam pattern; step 2: drying the prepared lost foam pattern; step 3: carrying out pattern repairing and model forming on the dried lost foam pattern to form a cluster model; step 4: coating the cluster model formed in the step 3; step 5: drying the cluster model coated in step 4; step 6: casting the cluster model obtained in step 5 to form an initial casting; step 7: polishing and painting the initial casting to form a final casting. According to the lost foam casting method provided by the invention, when the displacement between the liquid metal and the EPS cluster model is completed, a plastic film on the surface of a sand box is removed, and vacuum extraction is continued, so that the sand box does not collapse; the process is equivalent to crash handling for the casting, so that the residual stress in the casting is eliminated, and the mechanical properties of the casting are increased.

Description

technical field [0001] The invention belongs to the technical field of casting methods, and relates to a lost foam casting method. Background technique [0002] Most of the traditional casting models are wooden models, but because of their high production cost, waste of natural resources and long processing cycle, people have improved them. At present, polystyrene (EPS) has been used to make models, and the EPS model is directly embedded in the sand mold to form a solid sand mold, and molten iron is poured into this solid mold, polystyrene burns, and the molten iron is filled with the space occupied by polystyrene. space, which after cooling forms a casting identical to the model. Its disadvantages are: firstly, the free carbon produced after burning polystyrene accumulates in the casting or on the surface of the casting to form carbon deposits, causing the machined surface to be scrapped due to carbon deposit defects; secondly, due to the easy It falls off to form a paint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C7/02
Inventor 曹小康宋晓勇张世成陶振峰李念福杨宝峰刘建李亮
Owner HANZHONG YANHANG PRECISION MACHINERY MFG
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