CN104043787A - Solenoid valve casting mold and casting technique - Google Patents

Abstract

The invention discloses a solenoid valve casting mold and casting technique in the casting field. The casting technique comprises the steps of body core producing, shell mold producing, body core coating, shell matching, molding, smelting and pouring and casting detection. The casting mold comprises a body core and a shell mold, wherein the body core is made of loam cores and is poured with hot boxes; the loam cores adopt common loam core precoated sands; soldering iron ore sands are adopted for resanding; the surfaces are dip-coated with black graphite powder coatings after the loam cores are poured; the shell mold is poured with hot boxes and is cast by selecting common shell mold precoated sands; the body core molded by pouring is matched with a shell mold sand mold to be molded, and the body core is put in the shell mold to form the casting mold; the casting is poured with molten steel containing carbon and silicon. The casting technique has the advantages of advancement, high efficiency, reliable product quality and the like.

Description

Magnetic valve casting die and casting technique thereof

Technical field

The present invention relates to a kind of magnetic valve casting die and the casting technique thereof of casting field.

Background technology

In mechanical manufacturing field, baroque metalwork mostly adopts casting technique to produce, and casting is to be poured in casting mold by the metal liquid of 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.Complexity difference for different foundry goods due to its structure, needs to adopt different casting techniques.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 to solve a kind of baroque magnetic valve casting die and casting technique thereof.

Summary of the invention

The object of the invention is to solve a kind of baroque magnetic valve casting die and casting technique thereof.

The present invention is achieved by the following technical solutions:

A kind of magnetic valve casting die and casting technique thereof, is characterized in that: processing step is as follows: main core makings, shell mould making, main core coating, join shell, moulding, smelting and pouring and foundry goods detection,

1) main core is made: check that whether hot box is intact, the scope of examination comprises whether core box inside has incrustation, heating tube, core ejection mechanism, exhaust duct, venting plug position whether normal, 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 is made: check that whether hot box intact, the scope of examination comprises whether core box inside has the positions such as incrustation, heating tube, core ejection mechanism, exhaust duct, venting plug whether 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, close and whether check no-float after shell;

5) moulding: moulding adopts without sand molding, iron plate specification adopts 420X220 X 10mm

Casting gate foam ceramic filter;

6) smelting and pouring: pouring molten iron index carbon silicon control range is: C 3.15-3.25% Si 1.20-1.50,

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

Cast and outlet requirement

Coupon preparation: pour into a mould one group of coupon of 1/3 rear cast, three every group at molten iron;

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

Casting mold after cast is treated 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 sandblast.

The present invention has following beneficial effect:

1. technique advanced person, efficiency is high;

2. reliable product quality.

Detailed description of the invention

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

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

Magnetic valve casting die of the present invention and casting technique thereof comprise main core making, 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 in loam core after having cast;

Shell mould is poured into a mould with hot box, and shell mould is selected common shell mould precoated sand casting;

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

Smelting and pouring: cast with the molten iron that contains carbon silicon, the carbon silicon control range of molten iron index is: C 3.15-3.25% Si 1.20-1.50,

The physics and chemistry of foundry goods detects

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 be away from dead head position;

(3) carry out data result record.

3) mechanical performance

(1) foundry goods tensile strength is got 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, this batch of foundry goods scrapped processing;

(4) carry out data record.

4) chemical analysis

Claims (1)

1. magnetic valve casting die and a casting technique thereof, 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 detects,

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

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

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

Technological parameter: 230 DEG C-250 DEG C of heating-up temperatures, 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 is spent-9 degree, 180 DEG C-220 DEG C of bake out temperatures, temperature retention time 20 minutes-30 minutes;

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, close and whether check no-float after shell;

4) moulding: moulding adopts without sand molding, iron plate specification adopts 420X220 X 10mm

Casting gate foam ceramic filter;

5) smelting and pouring: pouring molten iron index carbon silicon control range is: C 3.15-3.25% Si 1.20-1.50,

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

Cast and outlet requirement

Coupon preparation: pour into a mould one group of coupon of 1/3 rear cast, three every group at molten iron;

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

6) casting mold after cast is treated the removable foundary weight in casting pressing port blackening rear;

7) the foundry goods temperature retention time in sand mold after cast must not be less than 2 hours;

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 sandblast.