CN105234351A - Pump body casting technology - Google Patents

Abstract

The invention discloses a pump body casting technology. The pump body casting technology includes the steps that mold joints arranged along an axially-split face upwards are manufactured into an upper mold and a lower mold which are of a whole structure, and the upper mold and the lower mold are arranged in an upper sand box and a lower sand box respectively after being machined through a numerical control machining tool; an upper casting mold and a lower casting mold are prepared from resin sand in a duplicated manner; a base plate sand core and a sand core are prepared from mixed sand prepared from chrome ore and zircon sand; the sand core is pre-assembled below the base plate sand core to be arranged in the lower casting mold, and poured molten metal sequentially enters a transverse runner and an inner runner through a straight runner and then is introduced into a cavity composed of the upper casting mold, the lower casting mold, the base plate sand core and the sand core to carry out bottom pouring; when the poured molten melt reaches the top of a riser from bottom to top, pouring is completed, and heat generating agents are immediately added into the riser; after a casting is completely cooled, the upper sand box and the lower sand box are opened; and heat treatment is carried out after sand removing and sprue and riser removing are carried out. The pump body casting technology has the beneficial effects that the technology is simple, the accuracy of the size of the casting is high, and the corrosion resistance and the abrasion resistance are good.

Description

A kind of pump housing casting technique

Technical field

The invention belongs to casting technology field, particularly a kind of pump housing casting technique.

Background technology

The middle-opening pump pump housing in conventional casting techniques casting, in the less situation of progression, its runner is more spacious, pressure-bearing is little, and wall is thinner, and wall thickness variation is little, when controlling pouring temperature well, use common sand moulding, easy sand removal, reach instructions for use, when progression arrives more than 7 grades, after reducing its volume, channel size is reduced, and pressure-bearing increases, and causes runner and outside wall thickness variation to increase, cause casting difficulty to increase, traditional pump housing casting technique makes runner occur scab, corrosion resistance and wearing no resistance.

Summary of the invention

Technical scheme of the present invention is achieved in that a kind of pump housing casting technique, and its step is as follows:

(1) open the die joint arranged towards upper place in edge and be prepared into integrally-built upper and lower mould respectively, be placed in cope, drag box respectively after numerical control machine tool processing;

(2) be copied into upper mold, lower mold with resin sand, make the mould of core and core depending on cavity shape numerical control machine tool respectively;

(3) mixed sand that the chrome ore of 50%-80% and the zircon sand of 20%-30% are mixed with is copied base plate core, core, core is assigned in advance base plate core to be placed in up and down in lower mold, the molten metal of cast enters cross gate, ingate successively via sprue, then introduces the die cavity be made up of upper mold, lower mold and base plate core, core and carry out bottom pour mold;

(4) be poured when the molten metal poured into a mould arrives the top of rising head from the bottom to top, namely in rising head, add exothermic mixture;

(5) after foundry goods all cools, open cope, drag box, heat-treat after sand removal, removal dead head.

Beneficial effect of the present invention: its processing step is simple, and casting dimension accuracy is high, corrosion resistance and wearability good, result of use is good.

Detailed description of the invention

Embodiment provided by the invention is described in further detail:

A kind of pump housing casting technique, its step is as follows:

(1) open the die joint arranged towards upper place in edge and be prepared into integrally-built upper and lower mould respectively, be placed in cope, drag box respectively after numerical control machine tool processing;

(2) be copied into upper mold, lower mold with resin sand, make the mould of core and core depending on cavity shape numerical control machine tool respectively;

(3) mixed sand that the chrome ore of 50%-80% and the zircon sand of 20%-30% are mixed with is copied base plate core, core, core is assigned in advance base plate core to be placed in up and down in lower mold, the molten metal of cast enters cross gate, ingate successively via sprue, then introduces the die cavity be made up of upper mold, lower mold and base plate core, core and carry out bottom pour mold;

(4) be poured when the molten metal poured into a mould arrives the top of rising head from the bottom to top, namely in rising head, add exothermic mixture;

(5) after foundry goods all cools, open cope, drag box, heat-treat after sand removal, removal dead head.

Present invention process step is simple, and casting dimension accuracy is high, corrosion resistance and wearability good, result of use is good.

In this description, the present invention is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, description is regarded in an illustrative, rather than a restrictive.

Claims (1)

1. a pump housing casting technique, is characterized in that, comprises the following steps:

(1) open the die joint arranged towards upper place in edge and be prepared into integrally-built upper and lower mould respectively, be placed in cope, drag box respectively after numerical control machine tool processing;

(2) be copied into upper mold, lower mold with resin sand, make the mould of core and core depending on cavity shape numerical control machine tool respectively;

(3) mixed sand that the chrome ore of 50%-80% and the zircon sand of 20%-30% are mixed with is copied base plate core, core, core is assigned in advance base plate core to be placed in up and down in lower mold, the molten metal of cast enters cross gate, ingate successively via sprue, then introduces the die cavity be made up of upper mold, lower mold and base plate core, core and carry out bottom pour mold;

(4) be poured when the molten metal poured into a mould arrives the top of rising head from the bottom to top, namely in rising head, add exothermic mixture;

(5) after foundry goods all cools, open cope, drag box, heat-treat after sand removal, removal dead head.