CN102527976A

CN102527976A - Preparation process for compound sand core for centrifugal cast pipe socket

Info

Publication number: CN102527976A
Application number: CN2012100421285A
Authority: CN
Inventors: 孔国滨; 焦为民; 许顺; 陈向东; 王云峰; 郭利栋; 张永和; 蒋秀峰; 李文忠; 靳杰
Original assignee: Xinxing Ductile Iron Pipes Co Ltd
Current assignee: Xinxing Ductile Iron Pipes Co Ltd
Priority date: 2012-02-23
Filing date: 2012-02-23
Publication date: 2012-07-04
Anticipated expiration: 2032-02-23
Also published as: CN102527976B

Abstract

The invention discloses a preparation process for a compound sand core for a centrifugal cast pipe socket, which belongs to the technical field of preparation processes for metal casting sand cores. The preparation process includes the steps: firstly, manufacturing a proper metal core frame; secondly, placing the metal core frame in a core box and filling casting sand into a casting sand forming cavity formed between the core box and the metal core frame; thirdly, compacting the casting sand to firmly fix the casting sand with the metal core frame; fourthly, taking the compound sand core out of the core box; and fifthly, cleaning up the metal core frame and reusing the metal core frame by returning to the second step. The metal core frame partially replaces the casting sand, consumption of the casting sand is decreased, and environmental pollution is reduced. In addition, the strength and the stability of the compound sand core are improved by the aid of the metal core frame, consumption of curing agents in the casting sand is reduced by controlling the temperature of a metal core frame, and excessive dependence on working environments is greatly weakened.

Description

A kind of spun cast pipe bellmouth is with the preparation technology of compound core

Technical field

The invention belongs to the fabricating technology field of metal casting, relate in particular to the preparation technology of a kind of spun cast pipe bellmouth with compound core with core.

Background technology

At present, centrifugal casting technique is very ripe.But receive the restriction of pattern draft, moulding often adopts whole cores to make or molding sand composite portion arbor is made, in order to take into account low cost and the demand that satisfies working strength.Especially in the spun cast pipe field, the bellmouth casting all adopts molding sand to accomplish.A large amount of disposable cores, not only waste material causes cost rising, environmental pollution, and complex manufacturing technology, and percent defective is higher.

Summary of the invention

Technical problem to be solved by this invention provides the preparation technology of a kind of spun cast pipe bellmouth with compound core, has that the molding sand use amount is few, environmental pollution is little, yield rate is high and advantages of high strength.

For solving the problems of the technologies described above, the technical scheme that the present invention taked is: a kind of spun cast pipe bellmouth is characterized in that with the preparation technology of compound core step is following:

Step 1 is made metal-cored according to the external form of cast tube bellmouth, and metal-cored comprises metal-cored outer ring and metal-cored inner ring, and metal-cored outer ring is connected through disc or spoke with metal-cored inner ring;

Step 2; Metal-cored is placed in the core box of making cast tube bellmouth with core; With the molding sand that is mixed with low amounts of resin and curing agent from metal-cored inner ring, metal-cored outer ring and disc or the formed molding sand inlet of spoke be injected into metal-cored with the formed molding sand molding cavity of core box, use metal-cored alternative part molding sand;

Step 3 adopts vibrating head to stretch in the molding sand molding cavity from the molding sand porch, with the molding sand vibration compacting; Perhaps adopt vibrating device, be placed on the bottom of core box,, reach purpose, make molding sand and metal-cored fixation molding sand jolt ramming with core box and metal-cored common vibration;

Step 4 is separated the left half module of core box with right half module, compound core is taken out from core box, at the outer surface brush releasing agent of compound core.

Said preparation technology also comprises step 5: the complex sand core metal core frame of finishing using keeps uniform temperature; Change temperature bath over to after will cleaning out attached to the molding sand on metal-cored; Metal-cored with temperature bath in the water heat-shift, be transferred to after being controlled at metal-cored temperature between room temperature to the 60 ° C step 2 carry out compound core repeat make.

Adopt the beneficial effect that technique scheme produced to be: through metal-cored use, part is sand substituted, has reduced the use amount of molding sand, has also reduced the use amount of resin and triethylamine simultaneously, has reduced the pollution to environment; In addition, through intensity and the stability of using metal-cored to improve compound core, yield rate is high; Through control, reduced the use amount of curing agent in the molding sand, the depending on unduly of having weakened greatly simultaneously to working environment to metal-cored body temperature.When making metal-cored outer ring, increase the thickness of outer ring consciously, on the thermodyn process centrifugal tube casting machine, can replace the use of pressing central layer, reduced one procedure, improved production efficiency.Metal-cored outer ring and inner ring are taked former or spoke connected mode, have both guaranteed that the adding molding sand was more convenient, have guaranteed the bonding strength of metal-cored outer ring and inner ring again, have improved metal-cored service life.

Description of drawings

Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation.

Fig. 1 is the plan structure sketch map of compound core among the present invention;

Fig. 2 be among Fig. 1 A-A to the sectional structure sketch map;

The sectional structure sketch map of core box and compound core when Fig. 3 is to use core box to make compound core;

Fig. 4 is said compound core user mode sectional structure sketch map;

Wherein: 1, metal-cored outer ring 2, metal-cored inner ring 3, molding sand layer 4, disc 5, molding sand inlet 6, core box 7, metal casting product 8, centrifugal tube casting machine.

The specific embodiment

Shown in Fig. 1-2, a kind of casting cast tube bellmouth is used compound core, comprises metal-cored and molding sand layer 3.Said metal-cored comprises metal-cored outer ring 1 and metal-cored inner ring 2; Said metal-cored outer ring 1 is fixedly connected on the upper end of said metal-cored inner ring 2 through disc 4 or spoke, and the outer wall of the inwall of said metal-cored outer ring 1 and said metal-cored inner ring 2 is provided with and fixes the sand groove.Be solidified with molding sand layer 3 on the outer wall of said metal-cored inner ring 2 and between said metal-cored outer ring 1 and metal-cored inner ring 2.

As shown in Figure 3, a kind of spun cast pipe bellmouth is characterized in that with the preparation technology of compound core step is following:

Step 1 is made metal-cored according to the external form of cast tube bellmouth, and metal-cored comprises metal-cored outer ring 1 and metal-cored inner ring 2, and metal-cored outer ring 1 is connected through disc 4 or spoke with metal-cored inner ring 2;

Step 2; Metal-cored is placed in the core box 6 of making cast tube bellmouth with core; With the molding sand that is mixed with low amounts of resin and curing agent from metal-cored inner ring 2, metal-cored outer ring 1 and disc 4 or the formed molding sand inlet 5 of spoke be injected into metal-cored with core box 6 formed molding sand molding cavities, use metal-cored alternative part molding sand;

Step 3 adopts vibrating head to enter the mouth from molding sand and 5 stretches in the molding sand molding cavity, with the molding sand vibration compacting; Perhaps adopt vibrating device, be placed on the bottom of core box 6,, reach purpose, make molding sand and metal-cored fixation molding sand jolt ramming with core box 6 and metal-cored common vibration;

Step 4 is separated the left half module of core box with right half module, compound core is taken out from core box, at the outer surface brush releasing agent of compound core;

Step 5; The compound core of finishing using; Metal-cored keeps uniform temperature, changes temperature bath over to after will cleaning out attached to the molding sand on metal-cored, metal-cored with temperature bath in the water heat-shift; Metal-cored temperature is controlled between room temperature to the 60 ° C be transferred to after (take off limit summer, winter capping) step 2 carry out compound core repeat make.

As shown in Figure 4, be compound core user mode sectional structure sketch map.Through metal-cored use, part is sand substituted, has reduced the use amount of molding sand, has also reduced the use amount of resin and triethylamine simultaneously, has reduced the pollution to environment; In addition, through intensity and the stability of using metal-cored to improve compound core, yield rate is high; Through control, reduced the use amount of curing agent in the molding sand, the depending on unduly of having weakened greatly simultaneously to working environment to metal-cored body temperature.When making metal-cored outer ring, increase the thickness of outer ring consciously, on the thermodyn process centrifugal tube casting machine, can replace the use of pressing central layer, reduced one procedure, improved production efficiency.Former or spoke connected mode are taked with inner ring in metal-cored outer ring 1, have both guaranteed that the adding molding sand was more convenient, have guaranteed the bonding strength of metal-cored outer ring 1 and inner ring again, have improved metal-cored service life.

Claims

1. a spun cast pipe bellmouth is characterized in that with the preparation technology of compound core step is following:

Step 1 is made metal-cored according to the external form of cast tube bellmouth, and metal-cored comprises metal-cored outer ring (1) and metal-cored inner ring (2), and metal-cored outer ring (1) is connected through disc (4) or spoke with metal-cored inner ring (2);

Step 2; Metal-cored is placed in the core box (6) of making cast tube bellmouth with core; With the molding sand that is mixed with low amounts of resin and curing agent from metal-cored inner ring (2), metal-cored outer ring (1) and disc (4) or the formed molding sand inlet of spoke (5) be injected into metal-cored with the formed molding sand molding cavity of core box (6), use metal-cored alternative part molding sand;

Step 3 adopts vibrating head to stretch in the molding sand molding cavity from molding sand inlet (5), with the molding sand vibration compacting; Perhaps adopt vibrating device, be placed on the bottom of core box (6),, reach purpose, make molding sand and metal-cored fixation molding sand jolt ramming with core box (6) and metal-cored common vibration;

Step 4 is separated the left half module of core box with right half module, compound core is taken out from core box (6), at the outer surface brush releasing agent of compound core.

2. according to the preparation technology of a kind of spun cast pipe bellmouth shown in the claim 1 with compound core; It is characterized in that said preparation technology also comprises step 5: the complex sand core metal core frame of finishing using keeps uniform temperature; Change temperature bath over to after will cleaning out attached to the molding sand on metal-cored; Metal-cored with temperature bath in the water heat-shift, be transferred to after being controlled at metal-cored temperature between room temperature to the 60 ° C step 2 carry out compound core repeat make.