CN104607601A - Pump body casting process - Google Patents

Abstract

The invention discloses a pump body casting process, integrally-built upper and lower dies are respectively prepared from parting surfaces which are respectively arranged along axial splitting surface upward position, the integrally-built upper and lower dies are processed by a numerical control machining tool, and then respectively placed in upper and lower sand boxes, upper and lower casting moulds are prepared by copying with resin sand, a bottom plate sand core and a sand core can be copied by mixed sand prepared from chromium ore sand and zircon sand, the sand core is pre-arranged under and on the bottom plate sand core, and then is placed in the lower casting mould, casting metal liquid enters, through a straight pouring gate, into a horizontal pouring gate and an inner pouring gate, a e cavity composed of the upper and lower casting moulds, the bottom plate sand core and the sand core is introduced for bottom pouring; when the casting metal liquid enters, from the bottom to the top, to the top of a sink head, the casting is completed, a heat generating agent is added into the sink head; when castings all are cooled, the upper and lower sand boxes are opened, and after sand cleaning and casting head removal, heat treatment is performed. The pump body casting process has the advantages of simple process, high accuracy of casting size, and good corrosion resistance and abrasion resistance.

Description

Pump housing casting technique

 

Technical field

The invention belongs to casting technology field, be specifically related to a kind of pump housing casting technique.

 

Background technology

The manufacture requirements casting dimension accuracy of pump body cast is high, and in current pump housing pouring technology, the casting finished products pump housing rough surface made, not only casting process is more, affects production capacity, and the precision of foundry goods cannot effectively be ensured simultaneously, and percent defective is higher.

 

Summary of the invention

In order to overcome the above-mentioned technical problem that prior art field exists, the object of the invention is to, provide a kind of pump housing casting technique, directly can cast out pump body cast, the precision of foundry goods is high, and processing technology thereof is simple.

Pump housing casting technique provided by the invention, 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 60%-80% and the zircon sand of 20%-40% 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.

Pump housing casting technique provided by the invention, its beneficial effect is, overcome operation in prior art processing pump housing technology more, the problem that workload is large, improves production efficiency; Avoid because of the defective mass defect caused of casting dimension processing, utilization rate of raw materials is high, reduces production cost; Technique is simple, and casting dimension accuracy is high, corrosion resistance and wearability good.

 

Detailed description of the invention

Below in conjunction with an embodiment, pump housing casting technique provided by the invention is described in detail.

Embodiment

The pump housing casting technique of the present embodiment, 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 70% and the zircon sand of 35% 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.

Pump housing casting technique, directly can cast out pump body cast, and without the need to machining, operation is simple, and the casting dimension of the finished product cast out is accurate, effectively ensure that casting quality.

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 70% and the zircon sand of 35% 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.