CN101844200A - Method for preventing coating from adhering to core support surface of water jacket core for casting - Google Patents

Abstract

The invention discloses a method for preventing a coating from adhering to the core support surface of a water jacket core for casting, wherein all sand cores are made of cold core sand, smaller core supports are not put in or put in the water jacket core when the core is manufactured, three shape following holes which are enough for inserting the core supports are drilled on a cover cap core relatively to the positions of the core supports, all the sand cores are once integrally assembled together when the cores are assembled, the core supports are installed and clamped into the water jacket core from the shape following holes drilled on the cover cap core after dip coating and drying are finished, and then the three small holes of the cover cap core are blocked through the prefabricated small sand cores. The invention effectively avoids the coating from adhering to the core support surface and stops the problems of difficult fusion of the core support and a cylinder body basal body due to coating partition or coating peeling, inclusion, cylinder sand holes and the like caused by the coating, and meanwhile, because the cores are integrally once assembled, the dimensional precision of a cast is also ensured.

Description

A kind of method that prevents that casting water cover core stud surface coating from adhering to

Technical field

The present invention relates to the cold core casting technology field, specifically is a kind of method that prevents that casting water cover core stud surface coating from adhering to.

Background technology

Engine cylinder-body foundry goods jacket core in casting process is subjected to the influence of weight of molten iron and buoyancy especially easily and produces distortion, fracture, at present the method for head it off mainly takes to use the jacket core stud to improve the ability of the withstand voltage and anti-floating power of jacket core, but the use of jacket core stud exists fatal shortcoming again---" jacket core stud clagging problem ", because stud need fuse with molten iron, so the adhesion of surface coating will cause a series of problems such as fused bad, the sand hole of stud, seepage to foundry goods.The solution that traditional process is taked mainly contains two kinds: first method is with all core overall package, uses the appropriate coating on opportunity that comes off when selecting dip-coating paint, utilizes the impulsive force of molten iron it to be washed away and overflows die cavity; Second method is respectively cylinder barrel core and jacket core to be carried out dip-coating, refills the core of the card support after the dip-coating, and the method for utilizing jacket core and block core secondary to assemble is avoided the stud adhesive coating material.The core assembling technology of first kind of process because of adopting one piece to put in place, has casting dimension accuracy advantage high and that guarantee easily, but play the purpose of avoiding producing defective owing to rely on molten iron to wash away coating, in case it is out of season that scouring force deficiency or coating come off, will cause problems such as fused bad, the sand hole of stud, seepage; Though second kind of process prevented adhesive coating material on the stud, effectively prevented generation of defects, owing to adopt twice core assembly, casting dimension is difficult again with control.

Summary of the invention

The purpose of this invention is to provide a kind of method that prevents that casting water cover core stud surface coating from adhering to, effectively avoided clagging in the stud surface, stopped because of coating cut off the stud cause and cylinder body matrix be difficult to merge or problems such as coating that coating causes peels off, is mingled with, cylinder barrel sand hole, so simultaneously owing to being the dimensional accuracy that the one piece core assembly has guaranteed foundry goods again.

Skill technical scheme of the present invention is as follows:

A kind of method that prevents that casting water cover core stud surface coating from adhering to, carry out according to the following steps order:

1), at first determines to make the size of cylinder body water jacket of engine core stud according to the size of cylinder body water jacket core, the material of cylinder body water jacket core stud should be the higher low carbon steel plate of fusing point, the thickness of steel plate is chosen in 1.5-1.7mm has higher intensity in order to assurance, and produces the plug core;

2), get the ratio arrangement cold core resin sand of 150Kg quartz sand according to resin addition 1.5-1.8%, wherein the temperature of quartz sand remains on 20-40 ℃, the proportion control of component I and component II is 55: 45 in the resin, cold core resin sand configuration finishing back makes jacket core with the cold core core shooter, should guarantee during making that the triethylamine temperature is 90-95 ℃, penetrating sand pressure is 3-5bar, penetrate sand time 2-6sec, guarantee 8-30sec the hardening time of core, solidifying pressure 2-6bar, core after making uses the core assembly jig platform respectively with limit core front end, the cylinder barrel core, core rear end, limit, jacket core, block core overall package is an one, do core surface dip-coating then at once and dry processing, the Baume degrees of dip-coating paint is set at 26-30, and bake out temperature is a district 150-185 ℃; Two district 190-200 ℃; Three district 190-200 ℃; Four district 185-195 ℃, drying time assurance 〉=55min;

3), after the oven dry of all cores finishes, use on specific purpose tool is installed jacket core with stud from block core hole, use the prefabricated plug core core holes blocking of will blocking a shot at last.

Compared with the prior art, beneficial effect of the present invention is as follows:

The present invention offers the module that forms block core hole in die for making core so that block core that can the batch making perforate, the less stud of surface area is not put into or put into to jacket core in the coremaking process, all cores are made the back that finishes and are used the core assembly positioning fixtures once all cores assemblings to be put in place, and stud be installed work, last shutoff block core are finished in dip-coating, oven dry back.Change under the whole core assembly mode of original cold core stud before the core dip-coating and placed method among the core, effectively avoided clagging in the stud surface, stopped because of coating cut off the stud cause and cylinder body matrix be difficult to merge or problems such as coating that coating causes peels off, is mingled with, cylinder barrel sand hole, so simultaneously owing to be the dimensional accuracy that the one piece core assembly has guaranteed the casting work again.

Description of drawings

Fig. 1 is a jacket core assembling schematic diagram of the present invention.

Fig. 2 is the be installed schematic diagram of cylinder body water jacket of engine core stud of the present invention.

The specific embodiment

Referring to accompanying drawing, a kind of method that prevents that casting water cover core stud surface coating from adhering to, carry out according to the following steps order:

1), at first determines to make the size of cylinder body water jacket of engine core stud according to the size of cylinder body water jacket core, the material of cylinder body water jacket core stud should be the higher low carbon steel plate of fusing point, the thickness of steel plate is chosen in 1.5-1.7mm has higher intensity in order to assurance, and produces the plug core;

2), get the ratio arrangement cold core resin sand of 150Kg quartz sand according to resin addition 1.5-1.8%, wherein the temperature of quartz sand remains on 20-40 ℃, the proportion control of component I and component II is 55: 45 in the resin, cold core resin sand configuration finishing back makes jacket core with the cold core core shooter, should guarantee during making that the triethylamine temperature is 90-95 ℃, penetrating sand pressure is 3-5bar, penetrate sand time 2-6sec, guarantee 8-30sec the hardening time of core, solidifying pressure 2-6bar, core after making uses the core assembly jig platform respectively with limit core front end 1, a plurality of cylinder barrel cores 2,3,4,5, core rear end, limit 6, jacket core 8, block core 7 overall package are one, do core surface dip-coating then at once and dry processing, the Baume degrees of dip-coating paint is set at 26-30, and bake out temperature is a district 150-185 ℃; Two district 190-200 ℃; Three district 190-200 ℃; Four district 185-195 ℃, drying time assurance 〉=55min;

3), after the oven dry of all cores finishes, use on specific purpose tool is installed jacket core with stud 10 from block core hole 9, use core hole 9 shutoff of will blocking a shot of prefabricated plug core 11 at last.

Claims (1)

1. a method that prevents that casting water cover core stud surface coating from adhering to is characterized in that: carry out according to the following steps order;

1), at first determines to make the size of cylinder body water jacket of engine core stud according to the size of cylinder body water jacket core, the material of cylinder body water jacket core stud should be the higher low carbon steel plate of fusing point, the thickness of steel plate is chosen in 1.5-1.7mm has higher intensity in order to assurance, and produces the plug core;

2), get the ratio arrangement cold core resin sand of 150Kg quartz sand according to resin addition 1.5-1.8%, wherein the temperature of quartz sand remains on 20-40 ℃, the proportion control of component I and component II is 55: 45 in the resin, cold core resin sand configuration finishing back makes jacket core with the cold core core shooter, should guarantee during making that the triethylamine temperature is 90-95 ℃, penetrating sand pressure is 3-5bar, penetrate sand time 2-6sec, guarantee 8-30sec the hardening time of core, solidifying pressure 2-6bar, core after making uses the core assembly jig platform respectively with limit core front end, the cylinder barrel core, core rear end, limit, jacket core, block core overall package is an one, do core surface dip-coating then at once and dry processing, the Baume degrees of dip-coating paint is set at 26-30, and bake out temperature is a district 150-185 ℃; Two district 190-200 ℃; Three district 190-200 ℃; Four district 185-195 ℃, drying time assurance 〉=55min;

3), after the oven dry of all cores finishes, use on specific purpose tool is installed jacket core with stud from block core hole.Use the prefabricated plug core core holes blocking of will blocking a shot at last.

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