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Study on Alkaline Phenolic Resins Binder of Casting Steel and Design of the Workshop

Author: JiangZongYing
Tutor: SunYuFu；LiuXinJiang
School: Zhengzhou University
Course: Materials Processing Engineering
Keywords: Alkaline phenolic resin Curing agent Process performance Sand Casting Workshop Design
CLC: TG221
Type: Master's thesis
Year: 2010
Downloads: 104
Quote: 0
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Abstract

Steel castings for its design flexibility, adaptability, the span weight as well as good mechanical properties, used in almost all industrial sectors. It molding process with the progress in the development of science and technology, the paper introduces the cast ester cured alkaline phenolic resin sand process performance, as well as a cast steel workshop modeling based on the process, the coremaking and sand processing Industry the workshop design content. Determination of the amount of alkaline phenolic resin sand of different resin and curing agent at room temperature tensile strength, tensile strength derived alkaline phenolic resin sand becomes larger with the increase of the amount of resin added. Resin is added in an amount of 2.5%, 40% of the amount of curing agent (relative to resin, following the same), the largest end-strength of 1.08 MPa and meet the technical requirements of the premise, however, choose low raw material consumption, cost savings, as well as reducing the defects that may arise because the binder too much. 2.0% of the amount of resin, 30% of the amount of curing agent added to the strength of the best recipe, 8h tensile strength of 0.91MPa, 24h tensile strength of 0.84MPa. By the different curing agents and added in an amount corresponding to the usable time and demolding time curve, we change the type and amount of the curing agent, the time can be used of the alkaline phenolic resin sand can be adjusted 5min ~ 90min, releasability The time can be adjusted in 12min ~ 210min. The type of the curing agent is a major factor, and impact can be used and the length of time and demolding time added in an amount smaller selected affect the amount of resin is added 2.0%, the curing agent is added to the amount of 30% of the alkaline phenolic resin and furan resin, gas evolution contrast can get similar tensile strength alkaline phenolic resin gas evolution than the furan resins gas evolution decreased by 28%, and phenolic resin precipitation does not affect the quality of steel castings gas, alkaline phenolic resin sand production cast steel blowhole defects tendency to be less than the furan resin sand. The alkaline phenolic resin sand high temperature compressive strength test, to obtain a resin of 2.0% to 30% of the phenolic resin curing agent in 1200 ℃ for 2min compressive strength is 0.2MPa, alkaline phenolic resin having good high temperature performance. The sample at 500 ℃ for 30 min compressive strength close to 0, the phenolic resin has a good collapsibility. The alkaline phenolic resin sand with furan resin sand thermal deformation contrast curve obtained the latter in the casting and solidification of the high temperature environment is not substantially with plasticity, has been expanded to be destroyed, while the former has a good plasticity and a secondary hardening phenomenon can effectively reduce hot tearing tendency of steel castings. Finally, the characteristics of alkaline phenolic resin sand and part of the experimental results, the completion of the shape of a new annual output of 10000t steel casting cast steel workshop, the coremaking and sand processing Industry the workshop design content. The workshop plane, the logistics design as well as the selection of equipment and work. Major equipment includes 40t / h mobile sand two 20t / h alkaline phenolic resin the sand dry regeneration system a set of 20t / h chromite sand sorting system set coremaking line and a lifting , auxiliary equipment, etc..

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Casting > Casting of raw materials and preparation > Molding material
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