CN109648040A - Jacket core formula and technique in a kind of diesel engine cylinder cover cast blank - Google Patents

Abstract

The invention discloses jacket core formula in a kind of diesel engine cylinder cover cast blank, the formula be by: nice foundry sand, chromite sand, quartz sand, phenolic resin, polyisocyanate resin, lubricant, polyethylene glycol oxide, 50% methenamine aqueous solution；Its feedstock composition includes each component of following parts by weight: 40-60 parts of nice foundry sands, 45-65 parts of chromite sands, 15-30 parts of quartz sands, 1-2 parts of phenolic resin, 1-2 parts of polyisocyanate resins, 0.2-0.4 parts of lubricants, 1-2 parts of polyethylene glycol oxides, and 1-2 parts of methenamine aqueous solution, sand mulling craft is provided simultaneously, present invention discloses jacket core formulas in a kind of diesel engine cylinder cover cast blank, jacket core more consolidation, expansion rate is low, gas forming amount is small, it improves and pours that part precision is low and the tidiness on surface, and then improve quality.

Description

Jacket core formula and technique in a kind of diesel engine cylinder cover cast blank

Technical field

The invention belongs to casting fields, and in particular to jacket core formula and technique in a kind of diesel engine cylinder cover cast blank.

Background technique

As diesel engine industry is to the high power of engine, high intensity, light-weighted trend development, so that diesel engine pair Casting, the dimensional accuracy, dense structure's property and surface quality for making gray iron propose increasingly higher demands, diesel engine cylinder cover casting Blank is made, is mostly spheroidal graphite cast-iron and vermicular cast iron material, using resin sand hand moulding technique, when the large and small water jacket sand of cylinder cap When core uses common quartz sand, size water-jacket space scab defect easily occurs after blank cleaning, serious iron even occur in individual places Burnt-in sand phenomenon hinders the string water effect for even blocking cylinder cap, and the domestic improvement carried out to jacket core, mainly changes sand core at present Into for hot box precoated sand, to increase sand intensity and anti-caking power, but hot box precoated sand jacket core only, single-piece big in yield It can make the most of the advantage in small cylinder cap, to the cylinder cap of some large-scale diesel engines, because its yield is small, the big feature of single-piece is still suitable Graphitization expansion can occur in casting solidification for resin sand hand moulding, ironcasting, and the main component lime stone of existing sand Type wall air-inflated pressure and graphitization expansion pressure in molten metal static pressure, type are acted on by thermal decomposition after molten iron casting Under retire, especially big to graphitization expansion effect spheroidal graphite cast-iron and vermicular cast iron, be easy because type wall is retired, intensity deficiency causes Shrinkage cavity defect causes workpiece shaping precision low, and the tidiness on surface is inadequate, so it is badly in need of the jacket core for a kind of type occur, It solves the above problems.

Summary of the invention

Goal of the invention: the purpose of the present invention is to solve deficiencies in the prior art, provide a kind of diesel engine cylinder cover casting Jacket core formula and technique in blank are made, is solved the above problems.

Technical solution: jacket core formula in a kind of diesel engine cylinder cover cast blank of the present invention, the formula be by: Nice foundry sand, chromite sand, quartz sand, phenolic resin, polyisocyanate resin, lubricant, polyethylene glycol oxide, 50% Wu Luotuo Product aqueous solution；Its feedstock composition includes each component of following parts by weight: 40-60 parts of nice foundry sands, 45-65 parts of chromite sands, 15-30 parts of quartz sands, 1-2 parts of phenolic resin, 1-2 parts of polyisocyanate resins, 0.2-0.4 parts of lubricants, 1-2 parts of polyoxyethylenes Alkene and 1-2 parts of methenamine aqueous solution.

Preferably, the methenamine it is water-soluble be 50% concentration aqueous solution.

Preferably, nice foundry sand and chromite sand use 70/140 mesh granularity, and quartz sand uses 40/70 mesh granularity.

The sand mulling craft of jacket core in a kind of diesel engine cylinder cover cast blank, using following steps:

1) by 40-60 parts of nice foundry sands, 45-65 parts of chromite sands, 15-30 parts of quartz sands, and molding sand mixing and blending machine is poured into respectively It is inside stirred, is uniformly mixed above-mentioned sand；

2) according to adding 1-2 parts of phenolic resin in sand after above-mentioned mixing again, 1-2 parts of polyisocyanate resins, 0.2-0.4 parts of profits Lubrication prescription, 1-2 parts of polyethylene glycol oxides and the 50% of 1-2 parts methenamine aqueous solution, pour into stirring in molding sand mixing and blending machine；

3) to after mixing evenly, be picked out completely using sand hopper, fuse is made in preparation.

The utility model has the advantages that of the invention solves the problems, such as large and small water-jacket space scab, internal iron burnt-in sand problem is completely eliminated, And the jacket core more consolidation prepared by the formula, expansion rate is low, gas forming amount is small, improves and pours that part precision is low and surface Tidiness, and then improve quality.

Specific embodiment

Jacket core formula in a kind of diesel engine cylinder cover cast blank, the formula are by nice foundry sand, chromite sand, quartz Sand, phenolic resin, polyisocyanate resin, lubricant, polyethylene glycol oxide, 50% methenamine aqueous solution；Its feedstock composition Each component including following parts by weight: 40-60 parts of nice foundry sands, 45-65 parts of chromite sands, 15-30 parts of quartz sands, 1-2 parts of phenol Urea formaldehyde, 1-2 parts of polyisocyanate resins, 0.2-0.4 parts of lubricants, 1-2 parts of polyethylene glycol oxides and 1-2 parts of Wu Luotuo Product aqueous solution.

In this example, the methenamine is water-soluble be 50% concentration aqueous solution.

In this example, nice foundry sand and chromite sand use 70/140 mesh granularity, and quartz sand uses 40/70 mesh granularity.

The sand mulling craft of jacket core in a kind of diesel engine cylinder cover cast blank, using following steps:

1) by 40-60 parts of nice foundry sands, 45-65 parts of chromite sands, 15-30 parts of quartz sands, and molding sand mixing and blending machine is poured into respectively It is inside stirred, is uniformly mixed above-mentioned sand；

2) according to adding 1-2 parts of phenolic resin in sand after above-mentioned mixing again, 1-2 parts of polyisocyanate resins, 0.2-0.4 parts of profits Lubrication prescription, 1-2 parts of polyethylene glycol oxides and the 50% of 1-2 parts methenamine aqueous solution, pour into stirring in molding sand mixing and blending machine；

3) to after mixing evenly, be picked out completely using sand hopper, fuse is made in preparation.

Of the invention solves the problems, such as large and small water-jacket space scab, completely eliminates internal iron burnt-in sand problem, and by being somebody's turn to do It is formulated the jacket core more consolidation of preparation, expansion rate is low, gas forming amount is small, and it improves and pours that part precision is low and the tidiness on surface, into And improve quality.

The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification For the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention Any simple modification, equivalent change and modification to the above embodiments, all of which are still within the scope of the technical scheme of the invention.

Claims (4)

1. jacket core formula in a kind of diesel engine cylinder cover cast blank, it is characterised in that: the formula is by nice foundry sand, ferrochrome Ore in sand form, quartz sand, phenolic resin, polyisocyanate resin, lubricant, polyethylene glycol oxide, 50% methenamine aqueous solution；Its Feedstock composition includes each component of following parts by weight: 40-60 parts of nice foundry sands, 45-65 parts of chromite sands, 15-30 parts of quartz Sand, 1-2 parts of phenolic resin, 1-2 parts of polyisocyanate resins, 0.2-0.4 parts of lubricants, 1-2 parts of polyethylene glycol oxides and 1-2 The methenamine aqueous solution of part.

2. the sand mulling craft of jacket core in diesel engine cylinder cover cast blank according to claim 1, it is characterised in that: described Methenamine is water-soluble be 50% concentration aqueous solution.

3. the sand mulling craft of jacket core in diesel engine cylinder cover cast blank according to claim 1, it is characterised in that: mound Sand and chromite sand use 70/140 mesh granularity, and quartz sand uses 40/70 mesh granularity.

4. the sand mulling craft of jacket core in a kind of diesel engine cylinder cover cast blank, it is characterised in that: use following steps:

1) by 40-60 parts of nice foundry sands, 45-65 parts of chromite sands, 15-30 parts of quartz sands, and molding sand mixing and blending machine is poured into respectively It is inside stirred, is uniformly mixed above-mentioned sand；

2) according to adding 1-2 parts of phenolic resin in sand after above-mentioned mixing again, 1-2 parts of polyisocyanate resins, 0.2-0.4 parts of profits Lubrication prescription, 1-2 parts of polyethylene glycol oxides and the 50% of 1-2 parts methenamine aqueous solution, pour into stirring in molding sand mixing and blending machine；

3) to after mixing evenly, be picked out completely using sand hopper, fuse is made in preparation.