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A manufacturing method of shaft products with thick and large section qt500-14

A technology for product manufacturing and large cross-section, applied in the field of metallurgy, can solve the problems of large differences in the structure of castings, limited effect of cold iron, complicated operation steps, etc., and achieve the effects of small differences, simple operation and simple preparation method.

Active Publication Date: 2018-08-21
JIANGSU HONGDE SPECIAL PARTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this kind of operation steps are cumbersome, the effect of cold iron is limited, it can only act on the place where the cold iron is placed, and the structure of castings is quite different
There are still risks such as poor graphite shape and fragmented graphite in hot spots of castings

Method used

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  • A manufacturing method of shaft products with thick and large section qt500-14
  • A manufacturing method of shaft products with thick and large section qt500-14

Examples

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Effect test

specific Embodiment 1

[0018] A method for manufacturing shaft products with thick and large section QT500-14, comprising the following steps:

[0019] Step (1), bottom box preparation: place the sand box flat on the mold, and the edge of the sand box is in direct contact with the flat plate to ensure that the flatness of the flat plate is ≤3mm, and then start to put sand, and the mold is released after the resin sand is cured for ≥2 hours;

[0020] Step (2), preparation of the cover box: place the sand box flat on the mold, then start to put sand, and release the mold after the resin sand solidifies for ≥ 2 hours;

[0021] Step (3), sand core preparation: place the mandrel, put the sand to solidify for ≥ 1 hour, and then release the mold;

[0022] Step (4), coating: preheat the metal mold to 50°C, evenly paint the inner cavity of the metal mold, the thickness of the coating is >0.5mm, and dry it, and prepare and paint the rest of the sand molds;

[0023] Step (5), assembly: adjust the level of the...

specific Embodiment 2

[0026] A method for manufacturing shaft products with thick and large section QT500-14, comprising the following steps:

[0027] Step (1), bottom box preparation: place the sand box flat on the mold, and the edge of the sand box is in direct contact with the flat plate to ensure that the flatness of the flat plate is ≤3mm, and then start to put sand, and the mold is released after the resin sand is cured for ≥2 hours;

[0028] Step (2), preparation of the cover box: place the sand box flat on the mold, then start to put sand, and release the mold after the resin sand solidifies for ≥ 2 hours;

[0029] Step (3), sand core preparation: place the mandrel, put the sand to solidify for ≥ 1 hour, and then release the mold;

[0030] Step (4), coating: the metal mold is preheated to 100°C, and the paint is evenly painted on the inner cavity of the metal mold, the thickness of the paint is > 0.5mm, and dried, and the rest of the sand molds are prepared and painted;

[0031] Step (5), ...

specific Embodiment 3

[0034] A method for manufacturing shaft products with thick and large section QT500-14, comprising the following steps:

[0035] Step (1), bottom box preparation: place the sand box flat on the mold, and the edge of the sand box is in direct contact with the flat plate to ensure that the flatness of the flat plate is ≤3mm, and then start to put sand, and the mold is released after the resin sand is cured for ≥2 hours;

[0036] Step (2), preparation of the cover box: place the sand box flat on the mold, then start to put sand, and release the mold after the resin sand solidifies for ≥ 2 hours;

[0037] Step (3), sand core preparation: place the mandrel, put the sand to solidify for ≥ 1 hour, and then release the mold;

[0038] Step (4), coating: the metal mold is preheated to 80°C, and the paint is evenly painted on the inner cavity of the metal mold, the thickness of the paint is >0.5mm, and dried, and the rest of the sand molds are prepared and painted;

[0039] Step (5), as...

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Abstract

The invention discloses a preparing method for QT500-14 shaft products with thick and large sections. The manufacturing method includes the following steps that firstly, a bottom box is prepared; secondly, a cover box is prepared; thirdly, a sand core is prepared; fourthly, coating is conducted; fifthly, assembling is conducted; sixthly, nodulizing inoculating is conducted; and seventhly, casting is conducted. The preparing method is simple, easy and convenient to operate and high in efficiency, a large number of chillers are not needed, and the chilling action of the chillers is limited; expansion of an iron die is small, graphitizing expansion is sufficiently utilized, and non-dead-head casting is achieved; and the iron die is in direct contact with air, heat dissipation is fast, fineness and roundness of a graphite nodule are facilitated, the whole casting tissue is balanced, the difference is small, and the mechanical performance is good.

Description

technical field [0001] The invention belongs to the field of metallurgy, and specifically relates to a method for manufacturing shaft products with thick and large cross-sections QT500-14, which fully utilizes the graphite expansion effect of nodular cast iron to achieve the purpose of riser-free casting. Background technique [0002] Thick and large-section ductile iron castings have excellent mechanical properties and economic advantages. They are important basic components of national major technical equipment and play a very important role in the national economy. With the advancement of ductile iron production technology and the continuous emergence of new application fields, the market for ductile iron parts with thick and large cross-sections is becoming more and more prosperous, and its typical representative is the heavy 100-ton nuclear spent nuclear fuel ductile iron storage and transportation container. However, due to its too thick section, the cooling rate is sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/08B22C9/02B22C9/22
CPCB22C9/02B22C9/22C22C33/08C22C37/04C22C37/10
Inventor 杨金德周张松陈铭张亚军
Owner JIANGSU HONGDE SPECIAL PARTS CO LTD
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