CN105215286A

CN105215286A - A kind of processing method of the pump housing

Info

Publication number: CN105215286A
Application number: CN201410304036.9A
Authority: CN
Inventors: 薛铁山
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-06-30
Filing date: 2014-06-30
Publication date: 2016-01-06

Abstract

The invention discloses a kind of processing method of the pump housing, belong to casting field, it is characterized in that comprising following procedure of processing: A, moulding, coremaking, B, coating and painting process, C, mould assembling, D, melting and cast, E, foundry goods pressure case, F, cleaning, G, heat treatment, this technique is simple, easy to operate, according to this explained hereafter gravel pump pump housing more than one piece, adopt magnetic powder inspection, cast-internal dense structure, without shrinkage cavity, shrinkage porosite, crack defect, casting dimension accuracy is high, corrosion resistance and wearability good, result of use is good, the foundry goods solving prior art production and processing easily produces shrinkage cavity, shrinkage porosite, the problem of the casting flaws such as crackle.

Description

A kind of processing method of the pump housing

Technical field

The invention belongs to casting field, particularly relate to a kind of processing method of the pump housing.

Background technology

Gravel pump is mainly used in the continus convergence of the strong abrasive materials can not carried due to the too large so that general Pulp pump of particle, be applicable to dredge, inhale the quick-fried slag conveying of gravel, river training, mining and metal smelt etc., due to the corrosivity of convey materials, so general flow passage components many employings abrasion-resistant stee and 2 wear-resistant white cast etc., its middle pump body is the major part of gravel pump, is also maximum wear-resisting class foundry goods; Current company generally adopts wear-resistant rich chromium cast iron material, because foundry goods is thicker, complex-shaped, easily produces the casting flaw such as shrinkage cavity and porosity, crackle.

Summary of the invention

The object of this invention is to provide a kind of processing method of the pump housing, with the cast-internal dense structure of this method production and processing, without shrinkage cavity and porosity, crack defect.

In order to achieve the above object, the present invention realizes by the following technical solutions, and a kind of processing method of the pump housing comprises following procedure of processing.

A, moulding, coremaking: adopt furane resins sand molding, the automatic mulling of flow mixer, resin amount is 1.2%, to ensure during moulding that the fast ring flange of the work of No. 1 core and pump housing model bodice are given as security tightly, use chromite sand to mix the sand of system in ring flange bottom, ensure that peripheral thickness is greater than 100mm, top box interval 200mm venting is multiple.

B, coating and painting process: adopt alcohol zircon flour coating swabbing to answer uniform smooth, ensure that coating surface is smooth, without obvious brush mark, corner angle are clear, nothing heap ash leaks ash; Coating layer thickness will ensure 0.5 ~ 1mm, and twice coating should be brushed in easy scab position, and running and feeding system should brush coating with the same painting of other working surface of core, some fire drying, checks to leak swabbing place and mend brush to put fire drying again; Then to ensure after adopting gauze, sand papering without brush mark, sagging, accumulation, the part of below former coating brush mark recess must not be injured.

C, mould assembling: after coating application should by under No. 1 core in sand mold, and then with resin sand, No. 1 core ring flange fuse to be buried; Before mould assembling, mo(u)ld bottom half is set level, preferably can be placed on fluffing of moulding sand ground; During mould assembling, whether application blowtorch surface baking 5-10 minute, check its position correct after lower core; First-class fastener after mould assembling, dead head place cardboard or iron plate are built; When using foundary weight pressure case, foundary weight should be greater than 2 times that lift case power, and foundary weight can not cover the exhaust passage of sand mold.

D, melting and cast: melting adopts 5T intermediate frequency furnace, control to melt out furnace temperature between 1520 ~ 1550 DEG C; Breed and deoxidation degasification, add the special refining deterioration agent of 1% at intermediate frequency furnace crossing, before coming out of the stove, the Si-Al-Ba alloy adding 1% in ladle is carried out deoxidation degassing processing; Casting ladle adopts shaking ladle cast, needs to scald bag before cast; Thermometric before cast, guarantees that temperature controls at 1360 ~ 1450 DEG C, adopts the method that low temperature waters soon, ensures that molten iron was poured in 60 ~ 80 seconds; Bleed is noted in casting process; Covering and heat insulating agent should be wanted immediately on rising head after being poured, after 20 minutes, teeming be carried out to rising head.

E, foundry goods pressure case: because rich chromium cast iron hot cracking tendency is larger, pump body cast is comparatively large again, and the pressure case time guarantees 5 days, ensures that casting temperature is lower than 200 DEG C before shake out.

F, cleaning: after cleaning out be stained with sand with shot-blasting machine, adopt CUT that riser neck is cut open Yi Tiaogou, then adopts sledgehammer to beat rising head, do not allow to use hammer foundry goods; Remaining riser neck with grinding-wheel grinder, same riser neck can not ground continuously.

G, heat treatment: carry out quenching heat treatment to foundry goods, be heated to 960 ~ 1050 DEG C, is incubated 10 hours air coolings of coming out of the stove.

The invention has the beneficial effects as follows: this technique is simple, easy to operate, according to this explained hereafter gravel pump pump housing more than one piece, adopt magnetic powder inspection, cast-internal dense structure, without shrinkage cavity and porosity, crack defect, casting dimension accuracy is high, corrosion resistance and wearability good, result of use is good.

Accompanying drawing explanation

Fig. 1 is the structural representation of the gravel pump pump housing.

Fig. 2 is the cross-sectional view of the gravel pump pump housing.

In figure, 1, No. 1 core, 2, No. 2 cores.

Detailed description of the invention

Further describe the present invention below in conjunction with accompanying drawing by specific embodiment, a kind of processing method of the pump housing, comprise following procedure of processing.

A, moulding, coremaking: adopt furane resins sand molding, the automatic mulling of flow mixer, resin amount is 1.2%, as shown in Figure 2, to ensure during moulding that the fast ring flange of the work of No. 1 core 1 and pump housing model bodice are given as security tightly, use in ring flange bottom chromite sand to mix the sand of system, ensure that peripheral thickness is greater than 100mm, also need placement chromite sand in typefounding position, top box interval 200mm venting is multiple; Just spout hole is removed at delivery port position.Note the exhausting problem of fuse, adopt gas rope to be wound around on crab.

C, mould assembling: as shown in Figure 2, by No. 1 core 1 time in sand mold, and then should bury No. 1 core 1 ring flange fuse with resin sand after coating application; Before mould assembling, mo(u)ld bottom half is set level, preferably can be placed on fluffing of moulding sand ground; During mould assembling, whether application blowtorch surface baking 5 ~ 10 minutes, check its position correct after lower core; First-class fastener after mould assembling, dead head place cardboard or iron plate are built; When using foundary weight pressure case, foundary weight should be greater than 2 times that lift case power, and foundary weight can not cover the exhaust passage of sand mold.

E, foundry goods pressure case: because rich chromium cast iron hot cracking tendency is larger, pump body cast is comparatively large again, and the pressure case time guarantees to be not less than 5 days, ensures that casting temperature is lower than 200 DEG C before shake out.

The present invention does not describe part in detail, is the known technology of those skilled in the art of the present technique.

Claims

1. a processing method for the pump housing, is characterized in that comprising following procedure of processing:

A, moulding, coremaking: adopt furane resins sand molding, the automatic mulling of flow mixer, resin amount is 1.2%, to ensure during moulding that the fast ring flange of the work of No. 1 core and pump housing model bodice are given as security tightly, use chromite sand to mix the sand of system in ring flange bottom, ensure that peripheral thickness is greater than 100mm, top box interval 200mm venting is multiple;

B, coating and painting process: adopt alcohol zircon flour coating swabbing to answer uniform smooth, ensure that coating surface is smooth, without obvious brush mark, corner angle are clear, nothing heap ash leaks ash; Coating layer thickness will ensure 0.5 ~ 1mm, and twice coating should be brushed in easy scab position, and running and feeding system should brush coating with the same painting of other working surface of core, some fire drying, checks to leak swabbing place and mend brush to put fire drying again; Then to ensure after adopting gauze, sand papering without brush mark, sagging, accumulation, the part of below former coating brush mark recess must not be injured;

C, mould assembling: after coating application should by under No. 1 core in sand mold, and then with resin sand, No. 1 core ring flange fuse to be buried; Before mould assembling, mo(u)ld bottom half is set level, preferably can be placed on fluffing of moulding sand ground; During mould assembling, whether application blowtorch surface baking 5-10 minute, check its position correct after lower core; First-class fastener after mould assembling, dead head place cardboard or iron plate are built; When using foundary weight pressure case, foundary weight should be greater than 2 times that lift case power, and foundary weight can not cover the exhaust passage of sand mold;

D, melting and cast: melting adopts 5T intermediate frequency furnace, control to melt out furnace temperature between 1520 ~ 1550 DEG C; Breed and deoxidation degasification, add the special refining deterioration agent of 1% at intermediate frequency furnace crossing, before coming out of the stove, the Si-Al-Ba alloy adding 1% in ladle is carried out deoxidation degassing processing; Casting ladle adopts shaking ladle cast, needs to scald bag before cast; Thermometric before cast, guarantees that temperature controls at 1360 ~ 1450 DEG C, adopts the method that low temperature waters soon, ensures that molten iron was poured in 60 ~ 80 seconds; Bleed is noted in casting process; Covering and heat insulating agent should be wanted immediately on rising head after being poured, after 20 minutes, teeming be carried out to rising head;

E, foundry goods pressure case: because rich chromium cast iron hot cracking tendency is larger, pump body cast is comparatively large again, and the pressure case time guarantees 5 days, ensures that casting temperature is lower than 200 DEG C before shake out;

F, cleaning: after cleaning out be stained with sand with shot-blasting machine, adopt CUT that riser neck is cut open Yi Tiaogou, then adopts sledgehammer to beat rising head, do not allow to use hammer foundry goods; Remaining riser neck with grinding-wheel grinder, same riser neck can not ground continuously;