A centrifugal roller tooling cold casting production method

Abstract

A centrifugal roller tooling cold mold casting production method belongs to the field of cold mold casting technology. It uses an integral roller tooling cold mold and a core combination prepared with water glass sand, pours molten iron, and unpacks the poured blank cold mold to room temperature to obtain a centrifugal roller tooling cold mold. Before assembly, the inner cavity of the integral roller tooling cold mold is sprayed with water-based zircon powder coating, and the core is sprayed with alcohol-based zircon powder. The centrifugal roller tooling cold mold casting method of the present application is environmentally friendly and energy-saving, and the preparation process is simple.

Description

Technical Field

[0001] The invention belongs to the technical field of cold mold casting, and in particular relates to a cold mold casting production method for a centrifugal roller tooling. Background Art

[0002] The traditional centrifugal cold mold casting method is a combination of external sand mold and internal iron brick core casting. Its disadvantages are: 1. The core needs to be stacked up layer by layer with iron bricks, and the outside is tightly wrapped with a certain thickness of clay sand; the outer layer is combined with a sand box and an iron bucket, and clay sand is added inside and tamped with a tamping hammer, which has high labor intensity and low production efficiency; 2. Whether it is the external sand mold or the core, it needs to be dried before assembly, and it needs to be dried with firewood. If the drying effect is not good, the cast cold mold will have casting defects and be scrapped. Due to the increasing requirements for environmental protection in recent years, the above drying method has not been adopted. Therefore, there is an urgent need for a new and economical centrifugal cold mold casting production method that is environmentally friendly and energy-saving, and has a simple preparation process. Summary of the invention

[0003] The invention discloses a novel and economical cold mold casting production method suitable for centrifugal roller tooling.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A novel centrifugal roller tooling cold mold casting production method adopts an integral roller tooling cold mold and a core prepared with water glass sand, pours molten iron, and unpacks the poured blank cold mold to room temperature to obtain a centrifugal roller tooling cold mold. Before assembly, the inner cavity of the integral roller tooling cold mold is sprayed with water-based zircon powder coating, and the core is sprayed with alcohol-based zircon powder.

[0006] A centrifugal roller tooling cold mold casting production method comprises the following steps:

[0007] Step A, preparing core molding tools, including a core box and a core ring, and performing core molding;

[0008] Step B: After the core molding is completed, a layer of alcohol-based zircon powder coating is applied on the surface of the core and ignited;

[0009] Step C, pouring and assembling the center ring bottom plate;

[0010] Step D: After the middle circle bottom plate is shaped, it is hoisted to the pouring pit for stabilization, and the core in step B is combined with the core head of the middle circle bottom plate;

[0011] Step E, heating the cold mold of the integral roller tooling, cleaning the inner cavity after heating, and spraying a layer of water-based zircon powder coating;

[0012] Step F, assembling the coated integral roller tooling cold mold with the assembled core and the middle ring bottom plate, and then performing a weight pressing operation;

[0013] Step G, placing a pouring funnel on the assembled integral roller tooling cold mold and core, and pouring molten iron;

[0014] Step H: After the pouring is completed, the blank cold mold is cooled to room temperature and unpacked, and the casting of the centrifugal roller tooling cold mold is completed by further processing.

[0015] The further improvement of the technical solution of the present invention is that: the method of core molding in step A is to combine the core box and the core ring, insert the exhaust pipe in the middle, and fill and tamp with water glass sand.

[0016] A further improvement of the technical solution of the present invention is that the mesh number of the water glass sand is 30-50.

[0017] A further improvement of the technical solution of the present invention is that in step B, the thickness of the alcohol-based zircon powder coating applied on the surface of the core sand is 3-4 mm.

[0018] A further improvement of the technical solution of the present invention is that: in step C, the bottom plate of the middle ring of the box is molded with water glass sand, and the core head is 2-3mm larger than the core size.

[0019] The further improvement of the technical solution of the present invention is that: in step E, the integral roller tooling cold mold is heated by a resistance furnace, and the inner cavity temperature is maintained at 200-230° C. when spraying the coating, and the thickness of the sprayed coating is 4-5 mm.

[0020] A further improvement of the technical solution of the present invention is that the temperature of the molten iron in step G is controlled at 1280-1290 degrees.

[0021] By adopting the above technical solution, the present invention achieves the following technical effects:

[0022] This application adopts the process-designed integral roller tooling cold mold to replace the external sand mold (sand box and iron barrel combination, clay sand is added inside to fill and tamp to form) of traditional centrifugal cold mold casting. The integral roller tooling cold mold enters the resistance furnace for heating. After heating, the inner cavity is cleaned and the water-based zircon powder coating is sprayed. The integral roller tooling cold mold does not need to be heated separately, and it can be heated together with the cold mold used in on-site production. The core uses water glass sand to replace iron bricks, and does not need to be baked. A layer of alcohol-based zircon powder coating is brushed on its surface and ignited. Then the cold mold and the core are combined. There is no need to use the traditional centrifugal cold mold casting method, and there is no need to dry the external sand mold and core. It is environmentally friendly and energy-saving, and the manufacturing process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a graphite diagram of a cold centrifugal roller obtained by the preparation method of the present application;

[0024] Figure 2It is a metallographic structure diagram of a cold centrifugal roller obtained by the preparation method of the present application. DETAILED DESCRIPTION

[0025] The technical solution of this application is described in detail below in conjunction with specific implementation methods.

[0026] A centrifugal roller tooling cold mold casting production method comprises the following steps:

[0027] Step A, preparing core molding tools, including a core box and a core ring, performing core molding, assembling the core box and the core ring, inserting an exhaust pipe in the middle, filling with water glass sand, and tamping;

[0028] Step B: After the core molding is completed, a layer of alcohol-based zircon powder coating is evenly applied on the surface of the core with a thickness of 3-4 mm and ignited to prevent sand from sticking after pouring;

[0029] Step C: Cast the center ring bottom plate of the box and use water glass sand to shape it. The core head is 2-3mm larger than the core size to facilitate core placement;

[0030] Step D: After the shape is completed, the middle circle bottom plate is hoisted to the pouring pit for stabilization, and the core in step B is combined with the core head of the middle circle bottom plate;

[0031] Step E, heating the cold mold of the integral roller tooling, cleaning the inner cavity after heating, and spraying a layer of water-based zircon powder coating;

[0032] The integral roller fixture cold mold is heated by a resistance furnace. When spraying the paint, the inner cavity temperature is kept at 200-230℃, and the thickness of the sprayed paint is 4-5mm. When spraying the paint, the nozzle on the spray gun moves uniformly from one end to the other along the central axis of the cold mold inner cavity. At the same time, the cold mold rotates uniformly along the central axis to ensure uniform spraying of the paint.

[0033] Step F, assembling the coated integral roller tooling cold mold with the assembled core and the middle ring bottom plate, and then performing a weighting operation to prevent the lifting box from catching fire due to the buoyancy of the molten iron;

[0034] Step G, placing a pouring funnel on the assembled integral roller tooling cold mold and core, pouring molten iron, and controlling the temperature of the molten iron to be 1280-1290 degrees;

[0035] Step H: After the pouring is completed, the blank cold mold is cooled to room temperature and unpacked, and the casting of the centrifugal roller tooling cold mold is completed by further processing.

[0036] The processed centrifugal roller cold mold is used in the kiln to cast the centrifugal roller.

[0037] The processed centrifugal roller cold mold is inspected, and there are no casting defects visible to the naked eye on the outside. The internal metal quality is inspected, and the results are as follows: Figure 1 and Figure 2As shown by Figure 1 It can be seen that the graphite diagram shows that the object under test is gray cast iron, the graphite morphology is worm-shaped, and type A graphite. The metallographic structure diagram shows that the structure is pearlite + ferrite + 1% carbide, and the ferrite content is 15%.

[0038] The method of this application is environmentally friendly and energy-saving to cast the centrifugal roller cold mold, and the preparation process is simple. The traditional centrifugal roller cold mold casting process takes 7 days from molding to unpacking, while the casting method of this application only takes 4 days from molding to unpacking, which greatly shortens the process time.

Claims

1. A centrifugal roller tooling cold mold casting production method, characterized in that: The integral roller tooling cold mold and the core prepared by water glass sand are combined, molten iron is poured, and the poured blank is cooled to room temperature and unpacked to obtain the centrifugal roller tooling cold mold. Before assembly, the inner cavity of the integral roller tooling cold mold is sprayed with water-based zircon powder coating, and the core is sprayed with alcohol-based zircon powder; The following steps are involved: Step A, preparing core molding tools, including a core box and a core ring, and performing core molding; the core molding method is to combine the core box and the core ring, insert an exhaust pipe in the middle, and fill and tamp with water glass sand; Step B: After the core molding is completed, a layer of alcohol-based zircon powder coating is applied on the surface of the core and ignited; Step C, casting the bottom plate of the middle circle of the box; the bottom plate of the middle circle of the box is molded with water glass sand, and the core head is 2-3mm larger than the core diameter; Step D: After the shape is completed, the middle circle bottom plate is hoisted to the pouring pit for stabilization, and the core in step B is combined with the core head of the middle circle bottom plate; Step E, heating the cold mold of the integral roller fixture, cleaning the inner cavity after heating, and spraying a layer of water-based zircon powder coating; the cold mold of the integral roller fixture is heated by a resistance furnace, and the inner cavity temperature is maintained at 200-230°C when spraying the coating, and the thickness of the sprayed coating is 4-5mm; Step F, assembling the coated integral roller tooling cold mold with the assembled core and the middle ring bottom plate, and then performing a weight pressing operation; Step G, placing a pouring funnel on the assembled integral roller tooling cold mold and core, and pouring molten iron; Step H: After the pouring is completed, the blank cold mold is cooled to room temperature and unpacked, and the casting of the centrifugal roller tooling cold mold is completed by further processing.

2. The centrifugal roller tooling cold mold casting production method according to claim 1, characterized in that: The mesh number of water glass sand is 30-50.

3. The centrifugal roller tooling cold mold casting production method according to claim 1, characterized in that: In step B, the thickness of the alcohol-based zircon powder coating applied on the surface of the core is 3-4 mm.

4. The centrifugal roller tooling cold mold casting production method according to claim 1, characterized in that: In step G, the temperature of the molten iron is controlled at 1280-1290 degrees.

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