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Lost foam casting production low-carbon steel upper core disc and impact seat processing method

A lost foam casting and processing method technology, applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of structural defects, poor density and fatigue strength, and the casting process is very complicated to deal with, and achieve improvement. Effects of density and fatigue resistance, elimination of structural defects, and improvement of service life

Inactive Publication Date: 2014-11-26
XIANGTAN SANTAI MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the upper core plate and the impact seat are low-carbon steel, the traditional casting process has defects in the structure, poor density and fatigue resistance of the product, and the casting process is very complicated.

Method used

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  • Lost foam casting production low-carbon steel upper core disc and impact seat processing method

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Experimental program
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Effect test

Embodiment 1

[0029] A method for producing a low-carbon steel upper core plate and impact seat by lost foam casting, comprising the following steps:

[0030] (1) Making foam model molds;

[0031] (2) Use EPS polystyrene particles to pre-expand through a pre-expanding machine to obtain pre-expanded beads;

[0032] (3) The pre-expanded beads are injected into the mold through the molding machine, and then foamed again by steam heating. After the foaming is complete, the shape is cooled and taken out;

[0033] (4) Dry the formed pattern for 72 hours to fully dehydrate the pattern;

[0034] (5) Bond the pouring system to the pattern;

[0035] (6) Configure special refractory coatings for dip coating. Dip coating refers to the overall dip coating after the "watering system is pasted on the pattern" as a whole. The purpose is to evenly coat the special refractory coating on the surface of the pattern, and then enter the drying room Carry out drying, obtain the product after drying, special re...

Embodiment 2

[0044] A method for producing a low-carbon steel upper core plate and impact seat by lost foam casting, comprising the following steps:

[0045] (1) Making foam model molds;

[0046] (2) Use EPS polystyrene particles to pre-expand through a pre-expanding machine to obtain pre-expanded beads;

[0047] (3) The pre-expanded beads are injected into the mold through the molding machine, and then foamed again by steam heating. After the foaming is complete, the shape is cooled and taken out;

[0048] (4) Dry the formed pattern for 72 hours to fully dehydrate the pattern;

[0049] (5) Bond the pouring system to the pattern;

[0050] (6) Configure special refractory coatings for dip coating. Dip coating refers to the overall dip coating after the "watering system is pasted on the pattern" as a whole. The purpose is to evenly coat the special refractory coating on the surface of the pattern, and then enter the drying room Carry out drying, obtain the product after drying, special re...

Embodiment 3

[0059] A method for producing a low-carbon steel upper core plate and impact seat by lost foam casting, comprising the following steps:

[0060] (1) Making foam model molds;

[0061] (2) Use EPS polystyrene particles to pre-expand through a pre-expanding machine to obtain pre-expanded beads;

[0062] (3) The pre-expanded beads are injected into the mold through the molding machine, and then foamed again by steam heating. After the foaming is complete, the shape is cooled and taken out;

[0063] (4) Dry the formed pattern for 72 hours to fully dehydrate the pattern;

[0064] (5) Bond the pouring system to the pattern;

[0065] (6) Configure special refractory coatings for dip coating. Dip coating refers to the overall dip coating after the "watering system is pasted on the pattern" as a whole. The purpose is to evenly coat the special refractory coating on the surface of the pattern, and then enter the drying room Carry out drying, obtain the product after drying, special re...

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Abstract

The invention discloses a lost foam casting production low-carbon steel upper core disc and impact seat processing method. The method comprises the following steps: making foam polystyrene EPS into a foaming member, which has the same shape as a cast and is a little bigger than the cast; painting a plurality of fireproof coatings on the surface of the foaming member, placing the foaming member in non-adhesive moulding sands, carrying out casting on the foaming member, wherein during the casting process, the foam polystyrene EPS foaming member is burnt and gasified under the assistance of vacummizing and vibration during the casting process, and finally the molten liquid replaces the foaming member as the cast. The lost foam technology is used to manufacture upper core disc and impact seat, is capable of reducing the metal tissue defects and improving the compactness and anti-fatigue strength of metals, moreover has the advantages of high precision in size, reducing on cleanness, reduced processing time, compact tissue of products, suitability for massive production, and high automation, can greatly improve the operation environment, and has greater advantages and a vaster prospect, compared to the conventional manufacture technology of upper core disc and impact seat.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a method for producing a low-carbon steel upper core plate and impact seat by lost foam casting. Background technique [0002] The impact seat is an important load-bearing and impact-resistant part on the railway vehicle. In the past, the sand casting process was used, and there were generally defects such as poor surface smoothness, low dimensional accuracy, shrinkage, subcutaneous pores and inclusions, especially cracks. The impact toughness, fatigue strength and other mechanical performance indicators have adverse effects. The upper core plate has the characteristics of large volume, small batch production, compact internal structure, high strength and high fatigue resistance. Because forgings have strong advantages in internal structure and mechanical properties, forging technology is often used to manufacture key parts on heavy-duty railway vehicles. Although the use of f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04
Inventor 颜学中王宇
Owner XIANGTAN SANTAI MACHINERY MFG
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