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S195 ductile iron camshaft metal mold casting technology

A metal mold casting, S195 technology, which is applied in the field of alloy cast iron casting, can solve the problems of high metal mold manufacturing cost, metal mold airtightness, and very sensitive impact, so as to save energy, not pollute the environment, and reduce micro-shrinkage porosity Effect

Inactive Publication Date: 2015-04-29
QINGDAO HEDELONG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the manufacturing cost of the metal mold is high, the metal mold is airtight and has no concession, and it is easy to cause defects such as insufficient washing of the casting, cracking or white casting of the cast iron; when the metal mold is cast, the working temperature of the mold, the pouring temperature of the alloy and the The pouring speed, the time the casting stays in the mold, and the coating used are very sensitive to the quality of the casting and need to be strictly controlled

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The metal is subjected to the following steps:

[0018] (1) The structure of the metal type: vertical type. Two open molds; the size of the straight gate is φ26mm, the size of the cross section is lOmmx22mm, and the size of the inner gate is φ6mm. Because the S195 camshaft requires full machining. Therefore, the inner cavity of the metal mold is the casting surface, which is not processed, only the parting surface and the positioning pin hole are processed. The slope of the cavity is 40°~60°. The metal type material is HT20~40.

[0019] (2) Spraying of paint: ① Cleaning the mold - the cavity of the mold can be cast by precision casting. No cutting, but the surface must be cleaned and activated; ②The coating is applied by spraying. Before spraying, the metal mold should be heated to a suitable temperature before spraying. The thickness of the coating is about 0.4-O. 6mm; ③ Coating roasting, the purpose is to further remove moisture and improve the sintering strength...

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Abstract

The invention discloses an S195 ductile iron camshaft metal mold casting technology. The inclination of a metal mold cavity is between 40 degrees and 60 degrees; and a metal mold is made of HT20-40. The S195 ductile iron camshaft metal mold casting technology comprises the following steps: coating a paint by adopting a spray finishing method, heating a metal mold to a proper temperature before spraying and spraying, warming and preheating the metal mold by taking a drying mold with the coating thickness of about 0.4-0.6mm, pouring preferably at the preheated temperature of 200-250DEG C (heating pouring temperature to 1320-1380DEG C by adopting a drying oven; pouring time: 6-8s) and then performing air cooling, cooling a casting at 800-850DEG C and performing casting discharge and immediately embedding into dry sand. The S195 ductile iron camshaft metallic casting technology has the advantages that the spheroidization rate is improved, textures are fined, and comprehensive mechanical property can be improved; in addition, due to the coagulating property of ductile iron, not only can the microporosity of the casting be reduced by the metal mold, but also the casting is accurate in dimensions, energy can be saved, and no environment pollution exists.

Description

[0001] technical field [0002] The invention belongs to the technical field of alloy cast iron casting, and in particular relates to a S195 ductile iron camshaft metal mold casting process. [0003] Background technique [0004] Compared with sand casting, metal mold casting has higher mechanical properties, dimensional accuracy and surface finish, and the process is simple and easy to realize mechanization and automation. The disadvantage is that the manufacturing cost of the metal mold is high, the metal mold is airtight and has no concession, and it is easy to cause defects such as insufficient washing of the casting, cracking or white casting of the cast iron; when the metal mold is cast, the working temperature of the mold, the pouring temperature of the alloy and the The pouring speed, the time the casting stays in the mold, and the coating used are very sensitive to the quality of the casting and need to be strictly controlled. Therefore, the key to metal mold ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/06B22C9/22
CPCB22C9/06
Inventor 常云青
Owner QINGDAO HEDELONG MACHINERY
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