CN102166621A

CN102166621A - Method for casting valve body of heavy-calibre non-rising-stem flat valve

Info

Publication number: CN102166621A
Application number: CN2011100881706A
Authority: CN
Inventors: 张辉
Original assignee: Jiangsu Jinshi Casting & Forging Co Ltd
Current assignee: Jiangsu Jinshi Casting & Forging Co Ltd
Priority date: 2011-04-09
Filing date: 2011-04-09
Publication date: 2011-08-31
Anticipated expiration: 2031-04-09
Also published as: CN102166621B

Abstract

The invention discloses a method for casting a valve body of a heavy-calibre non-rising-stem flat valve. In the method, ester-cured water-glass sand is used for modeling to make a sand core, two RND 300 neck-down heating heat-insulation dead heads (1) are arranged at the valve belly part of the valve body of the sand core, six shaped chills (4) which are 90mm thick are arranged at the bottom of the valve belly part at a distance of 30mm, eight shaped chills (3) which are 70mm thick are arranged at an edge flange of the valve body, and a Phi 200*50mm shaped chill (2) is installed at the tail part of the valve body; the neck-down heating heat-insulation dead heads (1) perform feeding on the valve belly part of the valve body, the shaped chills (4) perform feeding on the bottom of the valve belly part, and the neck-down heating heat-insulation dead heads (1) at the valve belly part perform feeding on the shaped chills (3) of the edge flange of the valve body, and the shaped chill (2) performs feeding on the tail part of the valve body. In the invention, the neck-down heating heat-insulation dead heads are used for feeding, convenience is brought for gas cutting, the casting yield is increased, casting defects, such as sand inclusion, shrinkage porosity, cracks, sand blowholes, slag blowholes and the like, are avoided, and technical demands of customers are met.

Description

The valve body casting method of heavy caliber blind rod type flap type

Technical field

The present invention relates to casting method, be specifically related to a kind of valve body casting method of heavy caliber blind rod type flap type.

Background technology

Heavy caliber blind rod type flap type is mainly used in engineering aspects such as oil, natural gas well jaws equipment, throttle well killing manifold and fluid control.Along with developing rapidly of oil, natural gas drilling and production technology, oil, the gas drilling degree of depth are in continuous increase; A large amount of discoveries of deep layer, super deep layer and the oil-gas reservoir of bad ground operating mode, for high performance blind rod type flap type provides rare opportunity to develop, especially oil as the status of strategic materials more obviously and crude oil price occupy high today, the exploration of oil, natural gas and the increasing of drilling dynamics are being strengthened in countries in the world, and heavy caliber blind rod type flap type will have vast market prospect.Exploitation heavy caliber blind rod type flap type, to the technical merit, the international competitiveness that strengthens product that promote China's oil and gas wellhead equipment, seize the international market, earning foreign exchange etc. for country all has good economy and social effect.

If process with the open die forging blank, then allowance is too big, and stock utilization is low, and product material cost, processing cost all can increase; If select for use the forging part blank to process, must change the stamp forging mould of forging equipment and purchasing price costliness, so both uneconomical, unrealistic again, determine to use the steel-casting blank at last.

But there are problems in heavy caliber blind rod type flap type steel-casting: because the valve body wall thickness is big, the loam core is bigger, form casting flaws such as burning into sand, shrinkage porosite, shrinkage cavity, crackle, sand pore, cinder hole easily, make the valve body of heavy caliber blind rod type flap type not reach required specification requirement.

Summary of the invention

The objective of the invention is: the valve body casting method that a kind of heavy caliber blind rod type flap type is provided, adopt the valve body of this casting method casting flap type, avoid valve body casting flaws such as burning into sand, shrinkage porosite, crackle, sand pore, cinder hole to occur, guarantee the valve body quality, satisfy client's specification requirement.

Technical solution of the present invention is: adopt the ester hardened sodium silicate sand molding and core making, it is characterized in that: two RND300 necking down heat preservation rising heads are installed at the valve body valve tripe position at core, 6 of the contoured chills of valve tripe bottom installation thickness 90 mm spacing 30mm, 8 of thickness 70mm contoured chills are installed at flange place, valve body limit, Ф 25 mm ventholes are pricked at flange top, limit, and the valve body afterbody is installed Ф 200X50 mm contoured chill; Wherein, valve body valve tripe position is by two RND300 necking down heat preservation riser feedings, feeding is carried out by thickness 90 mm contoured chills in valve tripe bottom, the thickness 70mm contoured chill of valve body limit flange carries out feeding with equivalent wall thickness form by the necking down heat preservation rising head on the valve tripe, and the valve body afterbody is by the feeding of Ф 200X50 mm contoured chill.

Wherein, sprue is the earthenware of Ф 60 mm, and cross gate is the earthenware of Ф 50 mm, and ingate is the earthenware of Ф 50 mm.

Wherein, chromite sand, thickness 15-30mm are placed in the core surface; The 10-15mm chromite sand is placed at ingate mouth place; Typefounding, rising head root are placed the 10-15mm chromite sand; The valve body afterbody is placed the 15-20mm chromite sand.

The present invention has the following advantages:

1) all adopts necking down heat preservation rising head to replace the side riser feeding, make things convenient for gas cutting, improved the foundry goods yield rate; 2) utilize chromite sand thermal conductivity, characteristic that refractoriness is high, make core have good alkali resistance; 3) adopt ester petrifying water glass molding and core making, avoid occurring casting flaws such as burning into sand, shrinkage porosite, crackle, sand pore, cinder hole, satisfy client's specification requirement.

Description of drawings

Fig. 1 is the sand core structure sketch of casting method of the present invention.

Fig. 2 is the vertical view of Fig. 1.

Fig. 3 is a necking down heat preservation rising head sketch.

Among the figure: 1, RND300 necking down heat preservation rising head, 2, Ф 200X50 mm contoured chill, 3, thickness 70mm contoured chill, 4, thickness 90 mm contoured chills.

The specific embodiment

Further specify technical solution of the present invention below in conjunction with accompanying drawing.

Shown in Fig. 1-2, adopt the ester hardened sodium silicate sand molding and core making, it is characterized in that: two RND300 necking down heat preservation rising heads 1 are installed at the valve body valve tripe position at core, the contoured chill 4 of 6 thickness 90 mm spacing 30mm is installed in valve tripe bottom, 8 blocks of thickness 70mm contoured chills 3 are installed at flange place, valve body limit, Ф 25 mm ventholes are pricked at flange top, limit, and the valve body afterbody is installed Ф 200X50 mm contoured chill 2; Wherein, valve body valve tripe position is by 1 feeding of two RND300 necking down heat preservation rising heads, feeding is carried out by thickness 90 mm contoured chills 4 in valve tripe bottom, the thickness 70mm contoured chill 3 of valve body limit flange carries out feeding with equivalent wall thickness form by the necking down heat preservation rising head 1 on the valve tripe, and the valve body afterbody is by 2 feeding of Ф 200X50 mm contoured chill.

Claims

1. the valve body casting method of heavy caliber blind rod type flap type, adopt the ester hardened sodium silicate sand molding and core making, it is characterized in that: two RND300 necking down heat preservation rising heads (1) are installed at the valve body valve tripe position at core, the contoured chill (4) of 6 thickness 90 mm spacing 30mm is installed in valve tripe bottom, 8 blocks of thickness 70mm contoured chills (3) are installed at flange place, valve body limit, Ф 25 mm ventholes are pricked at flange top, limit, and the valve body afterbody is installed Ф 200X50 mm contoured chill (2); Wherein, valve body valve tripe position is by two RND300 necking down heat preservation rising heads (1) feeding, feeding is carried out by thickness 90 mm contoured chills (4) in valve tripe bottom, the thickness 70mm contoured chill (3) of valve body limit flange carries out feeding with equivalent wall thickness form by the necking down heat preservation rising head (1) on the valve tripe, and the valve body afterbody is by Ф 200X50 mm contoured chill (2) feeding.

2. the valve body casting method of heavy caliber blind rod type flap type according to claim 1 is characterized in that: wherein, sprue is the earthenware of Ф 60 mm, and cross gate is the earthenware of Ф 50 mm, and ingate is the earthenware of Ф 50 mm.

3. the valve body casting method of heavy caliber blind rod type flap type according to claim 1 is characterized in that: wherein, chromite sand, thickness 15-30mm are placed in the core surface; The 10-15mm chromite sand is placed at ingate mouth place; Typefounding, rising head root are placed the 10-15mm chromite sand; The valve body afterbody is placed the 15-20mm chromite sand.