CN104043787B

CN104043787B - The casting technique of magnetic valve foundry goods

Info

Publication number: CN104043787B
Application number: CN201410284436.8A
Authority: CN
Inventors: 丁洋; 范小亮
Original assignee: Nantong Huadong Hydraulic Technology Co Ltd
Current assignee: Nantong Huadong Hydraulic Technology Co Ltd
Priority date: 2014-06-24
Filing date: 2014-06-24
Publication date: 2016-01-20
Anticipated expiration: 2034-06-24
Also published as: CN104043787A

Abstract

The invention discloses the casting technique of a kind of magnetic valve foundry goods of casting field, comprise the making of main core, shell mould making, main core coating, join shell, moulding, smelting and pouring and foundry goods detect.Casting die is made up of main core and shell mould, and main core is loam core material, and with hot box cast, loam core adopts common loam core precoated sand, and stop-off adopts flatiron ore in sand form, and surface dip-coating black blacking is carried out after having cast in loam core; Shell mould hot box is poured into a mould, and shell mould selects common shell mould precoated sand to cast; Main core and the shell mould sand mo(u)ld of cast molding join casing forming, and shell mould composition casting die put into by main core; Cast with the molten iron containing carbon silicon.The present invention has the advantages such as the high and reliable product quality of technique advanced person, efficiency.

Description

The casting technique of magnetic valve foundry goods

Technical field

The present invention relates to the casting technique of a kind of magnetic valve foundry goods of casting field.

Background technology

In mechanical manufacturing field, baroque metalwork mostly adopts casting technique to produce, and casting is poured in casting mold by the metal liquid by melting, obtains the manufacturing process of the part of required form and performance through cooled and solidified.Casting is conventional manufacture method, and casting main processes comprises: Metal Melting, model manufacturing, casting solidification and demoulding cleaning etc.For different foundry goods because the complexity of its structure is different, different casting techniques need be adopted.The magnetic valve foundry goods of this patent is due to complex structure, routine casting demoulding difficulty, adopt loam core model manufacturing, the fireproof coating that loam core is mixed with by resistant to elevated temperatures special binders and refractory material, the object of the invention is the casting technique solving a kind of baroque magnetic valve foundry goods.

Summary of the invention

The object of the invention is the casting technique solving a kind of baroque magnetic valve foundry goods.

The present invention is achieved by the following technical solutions:

A casting technique for magnetic valve foundry goods, is characterized in that: processing step is as follows: main core making, shell mould making, main core coating, join shell, moulding, smelting and pouring and foundry goods detect,

1) main core makes: check that whether hot box is intact, and whether normally whether the scope of examination comprises core box interior has incrustation, heating tube, core ejection mechanism, exhaust duct, venting plug position, and main core adopts common loam core precoated sand, and stop-off adopts flatiron ore in sand form,

Technological parameter: heating-up temperature DEG C 230-250, shooting pressure (MPa) 0.4-0.7, shooting time (S) 4-6, hardening time (S) 40-50;

2) shell mould makes: check that whether hot box intact, and whether whether the scope of examination comprises core box interior has the positions such as incrustation, heating tube, core ejection mechanism, exhaust duct, venting plug normal, precoated sand select common shell mould precoated sand,

Technological parameter: heating-up temperature DEG C 230-250, shooting pressure (MPa) 0.4-0.7, shooting time (S) 4-6, hardening time (S) 100-120;

3) main core coating: main wicking surface dip-coating black blacking,

Technological parameter: Baume degrees (degree) 7-9, bake out temperature (DEG C) 180-220, temperature retention time (minute) 20-30;

4) join shell: blow off residue in shell mould with air gun, check whether main core collides with and coating hanging point, and whether core puts in place, and main core is put into shell mould, after closing shell, check whether no-float;

5) moulding: moulding adopts without sand molding, iron plate specification adopts 420X220X10mm

Casting gate foam ceramic filter;

6) smelting and pouring: pouring molten iron index carbon silicon control range is: C3.15-3.25%Si1.20-1.50,

Technological parameter: tapping temperature (DEG C) 1500-1520, pouring temperature (DEG C)

1380-1420, the duration of pouring (min)≤12,

Cast and outlet requirement

Prepared by coupon: cast one group of coupon after molten iron cast 1/3, often organizes three;

Cast: during cast, bag mouth must aim at cast gate, controls poring rate well, and molten iron must not stop, and must be noted that pushing off the slag bleed simultaneously;

Casting mold after cast treats the removable foundary weight in casting pressing port blackening rear;

Foundry goods after cast temperature retention time in sand mold must not be less than 2 hours;

7) foundry goods detects:

Outward appearance inner chamber inspection surface roughness uniformity, without obvious casting flaw; Endoscopy runner, must ensure that runner is smooth, without casting flaws such as scab, fash, sand hole, cinder holes; Foundry goods die joint must be polished level and smooth clean, hole place flawless. and without colliding with, rusty stain, must secondary ball blast after sandblasting.

The present invention has following beneficial effect:

1. technique is advanced, and efficiency is high;

2. reliable product quality.

Detailed description of the invention

Below in conjunction with in concrete enforcement, content of the present invention is described further:

Object of the present invention is the problem solving the smooth and surface roughness uniformity of the runner of casting process medium casting.

The casting technique of magnetic valve foundry goods of the present invention comprises the making of main core, shell mould making, main core coating, joins shell, moulding, smelting and pouring and foundry goods detect.

Casting die is made up of main core and shell mould, and main core is loam core material, and with hot box cast, loam core adopts common loam core precoated sand, and stop-off adopts flatiron ore in sand form, and surface dip-coating black blacking is carried out after having cast in loam core;

Shell mould hot box is poured into a mould, and shell mould selects common shell mould precoated sand to cast;

Main core and the shell mould sand mo(u)ld of cast molding join casing forming, and shell mould composition casting die put into by main core;

Smelting and pouring: cast with the molten iron containing carbon silicon, the carbon silicon control range of molten iron index is: C3.15-3.25%Si1.20-1.50,

The Physico-chemical tests of foundry goods

1) hardness test

The hardness of foundry goods is: HB200-230

2) Metallographic Analysis

A type graphite	Graphite length	Iron phosphide eutectic, carbide
			≥75％	4～6	≤5％

Note:

(1) Metallographic Analysis is done in per tour;

(2) test block must sample from foundry goods body, and sample position will away from dead head position;

(3) data result record is carried out.

3) mechanical performance

(1) foundry goods tensile strength gets coupon test: σ b >=300Mpa;

(2) every iron clad water is got a coupon and is done measuring mechanical property, and the mark date on sample must be consistent with the date on foundry goods;

(3) as performance inconsistency lattice, process scrapped by this batch of foundry goods;

(4) data record is carried out.

4) chemical analysis

Claims

1. a casting technique for magnetic valve foundry goods, is characterized in that: processing step is as follows: main core making, shell mould making, main core coating, join shell, moulding, smelting and pouring and foundry goods detect,

1) main core makes: check that whether hot box is intact, and whether whether the scope of examination comprises core box interior has incrustation, heating tube, core ejection mechanism, exhaust duct and venting plug position normal, and main core adopts common loam core precoated sand, and stop-off adopts flatiron ore in sand form,

Technological parameter: heating-up temperature 230 DEG C-250 DEG C, shooting pressure 0.4MPa-0.7MPa, shooting time 4S-6S, hardening time 40S-50S;

2) shell mould makes: check that whether hot box intact, and whether whether the scope of examination comprises core box interior has the positions such as incrustation, heating tube, core ejection mechanism, exhaust duct and venting plug normal, precoated sand select common shell mould precoated sand,

Technological parameter: heating-up temperature 230 DEG C-250 DEG C, shooting pressure 0.4MPa-0.7MPa, shooting time 4S-6S, hardening time 100S-120S;

3) main core coating: main wicking surface dip-coating black blacking,

Technological parameter: Baume degrees 7 degree of-9 degree, bake out temperature 180 DEG C-220 DEG C, temperature retention time 20 minutes-30 minutes;

5) moulding: moulding adopts without sand molding, iron plate specification adopts 420 × 220 × 10mm

Casting gate foam ceramic filter;

Technological parameter: tapping temperature 1500 DEG C-1520 DEG C, pouring temperature 1380 DEG C-1420 DEG C, the duration of pouring≤12min,

Cast and outlet requirement

7) foundry goods detects:

Outward appearance inner chamber inspection surface roughness uniformity, without obvious casting flaw; Endoscopy runner, must ensure that runner is smooth, without casting flaws such as scab, fash, sand hole, cinder holes; Foundry goods die joint must be polished level and smooth clean, hole place flawless, without colliding with, without rusty stain, and must secondary ball blast after sandblasting.