CN105598389A - Process for casting seal rainproof complex flanges - Google Patents

Abstract

The invention discloses a process for casting seal rainproof complex flanges. The complex flanges comprise first flanges and second flanges. Each first flange and the corresponding second flange are butted to each other in the left-right direction, each first flange comprises a first flange body and a protective cover, at least four first fixing holes are uniformly formed in each first flange body, at least four oil filler holes are further uniformly formed in each first flange body, first lugs are further respectively uniformly arranged on the surface of each first flange body, and first grooves are further respectively uniformly formed in the surface of each first flange body; each second flange comprises a second flange body, at least four second fixing holes are uniformly formed in each second flange body, second lugs are further respectively uniformly arranged on each second flange body, and second grooves are further respectively uniformly formed in each second flange body. The process has the advantages that the process is simple and feasible, the seal rainproof complex flanges cast by the aid of the process are low in casting cost, simple in structure, high in connectivity and good in sealing performance, lubrication can be facilitated when the seal rainproof complex flanges are used, rainproof effects can be realized, the service lives of the seal rainproof complex flanges can be prolonged, and the cost can be reduced.

Description

A Casting Process of a Sealed and Rainproof Composite Flange

technical field

The invention relates to a casting process, in particular to a casting process of a sealed and rainproof composite flange.

Background technique

With the rapid and continuous development of the economy, the output of steel castings has increased rapidly. In the future, the production of large steel castings with high quality, high added value, and special materials and properties will become a new development direction of the steel casting industry. Flanges It is one of the typical parts of large steel castings. Flanges are also called flange flanges or flanges. Flanges are parts that are connected to each other between pipes. The flange on the inlet is used for the connection between two equipments, such as the reducer flange, etc. The flange connection or flange joint refers to the connection of flanges, gaskets and bolts as a group of combined seals. The detachable connection of the structure, the pipeline flange refers to the flange used for piping in the pipeline device, and the equipment refers to the inlet and outlet flange of the equipment. There are holes on the flange, and the bolts make the two flanges tightly connected. Sealed with a gasket, the flange is divided into threaded connection flange, welding flange and clip flange. In addition to the dimensional accuracy, excellent mechanical properties must also be guaranteed to meet its working needs under harsh conditions. The requirements for flanges are getting higher and higher. However, due to the short production time of the existing steel casting workshop, the reserve of metallurgical accessories is insufficient. , organize production according to the original process, it is difficult to guarantee the production cycle, so a new flange casting process must be developed in combination with the actual production situation of the workshop, which can produce high-quality flanges to meet the requirements of the work.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a casting process for a sealed and rainproof composite flange. The casting process is simple and easy, and the casting cost is low. It is easy to lubricate when used, has strong connection, good sealing performance, and has the effect of preventing rain, which prolongs the service life and reduces the cost.

In order to solve the above technical problems, the present invention provides a casting process of a sealed and rainproof composite flange. The cast composite flange includes a first flange and a second flange that are butted on the left and right, wherein:

The first flange includes a first flange body and a shield arranged on the first flange body. The shield is formed by extending outward along the edge of the first flange body. At least four flanges are evenly distributed on the first flange body. The first fixing hole, the first fixing hole penetrates the first flange body, and at least four oiling holes are evenly distributed on the first flange body, one oiling hole corresponds to a first fixing hole, and the oiling hole is connected with the first fixing hole Vertical communication, the surface of the first flange body is also uniformly distributed with first bumps and first grooves, and the first bumps, first fixing holes and first grooves are spaced apart;

The second flange includes a second flange body, at least four second fixing holes adapted to the first fixing holes are evenly distributed on the second flange body, and second protrusions are evenly distributed on the second flange body and the second groove, the second protrusion is adapted to the first groove, the second groove is adapted to the first protrusion, and the intervals between the second groove, the second fixing hole and the second protrusion are distributed , and the second groove, the second fixing hole and the second protrusion on the second flange body are in sequence with the positions of the first protrusion, the first fixing hole and the first groove on the first flange body Strict correspondence;

The composite flange casting process specifically includes the following steps:

(1) According to the size of the first flange and the second flange, the molding sand and core sand are used as molding materials to make a mold. Before making the mold, the molding sand in the molding material is first placed in an oven for drying , after drying, coat a layer of release agent on the surface of the mold;

The release agent is made of talcum powder, water, silicone oil, and vegetable oil. The specific parts by mass are talcum powder: 20-30 parts, water: 10-20 parts, silicone oil: 20-30 parts, vegetable oil: 30-40 parts part, and then spray the release agent on the surface of the mold cavity with a spray gun, with a thickness of 0.05-0.1mm;

Technical effect, the mold release agent is resistant to high temperature, has good stability at high temperature, and has good mold wall adhesion, mainly for heat insulation, protecting the mold from being burned, and improving the service life of the mold, and secondly lubricating the contact between the casting and the mold interface to facilitate demoulding;

(2) Place the raw materials of the first flange and the second flange in a well-type crucible resistance furnace for melting. The crucible is now preheated to dark red during melting, and the raw materials of the first flange and the second flange are Place it at the furnace mouth to preheat. When the temperature of the crucible reaches 150-170°C, spray paint into the crucible, then add the preheated raw materials, and under the protection of the mixed gas, heat up to 1000-1200°C for melting. After the raw material liquid is obtained, stir it slightly, then refine and degas it with a dry hexachloroethane preparation, let it stand for 8-10 minutes, then sprinkle perlite slag on the raw material liquid to purify the raw material liquid, and immediately remove the slag to obtain the raw material liquid, press The composition of the raw material solution in terms of mass percentage is as follows:

Zn: 3-6%, Mo: 1-1.5%, Ti: 1-1.2%, N: 0.02-0.03%, Cr: 8-11%, Ni: 3-6%, C: 0.01-0.03%, Mn : 0.5-0.7%, Nb: 0.3-0.6%, Cu: 0.3-0.5%, W: 0.5-0.7%, Si: 0.8-1.0%, P: 0.025-0.030%, S: 0.008-0.010%, rare earth elements : 0.3-0.5%, the rest is Fe and unavoidable impurities;

Rare earth elements include the following components by mass percentage: lanthanum: 5-8%, cerium: 5-7%, scandium: 5-8%, yttrium: 3-7%, samarium: 10-13%, gadolinium: 5- 7%, praseodymium: 6-7%, neodymium: 11-15%, the rest are lanthanide elements, the sum of the above components is 100%;

The paint sprayed in the crucible includes the following components by mass percentage: 62% talcum powder, 5% water glass, 30% water, and 3% boric acid. The sum of the above components is 100%; The mixed gas is specifically 75% compressed air, 24% carbon dioxide and 1% tetrafluoroethane;

(3) Quickly and steadily inject the smelted raw material solution into the mold prepared in step (1) to obtain castings. The pouring temperature is 800-900°C and the pouring time is 9-15 minutes. When the mold is cooled to room temperature, take out the casting;

(4) Solid solution the castings at 540-560°C for 10-12h, after water quenching at room temperature, artificially aging at 175-185°C for 8-10h;

(5) Carry out heat treatment on the casting, the specific operation is:

aAnnealing: Heat the casting furnace to 500-600°C and keep it warm for 5-8 minutes, then cool the furnace to 300-400°C, then open the furnace door and continue to cool slowly to 200-250°C, take out the furnace and air cool to room temperature;

b Quenching: Slowly heat the casting annealed in step a to 300-380°C and keep it warm for 10-20min, heat it again to 450-500°C, and then spray the casting with water to quickly cool down;

c Tempering: Put the quenched casting into the furnace again at room temperature and heat it to 300-350°C, keep it warm for 10-13min, and then take it out of the furnace and air cool it to room temperature;

(6) Surface sand blasting and ultrasonic non-destructive testing are carried out on the heat-treated castings in sequence, and those that pass the test are finally put into storage.

The technical scheme further defined in the present invention is:

In the casting process of the above-mentioned sealed and rainproof composite flange, the composition of the raw material liquid in terms of mass percentage is as follows:

Zn: 3%, Mo: 1%, Ti: 1%, N: 0.02%, Cr: 8%, Ni: 3%, C: 0.01%, Mn: 0.5%, Nb: 0.3%, Cu: 0.3%, W: 0.5%, Si: 0.8%, P: 0.025%, S: 0.008%, rare earth elements: 0.3%, the rest is Fe and unavoidable impurities;

Rare earth elements include the following components by mass percentage: lanthanum: 5%, cerium: 5%, scandium: 5%, yttrium: 3%, samarium: 10%, gadolinium: 5%, praseodymium: 6%, neodymium: 11% , and the rest are lanthanides, and the sum of the above components is 100%.

In the casting process of the above-mentioned sealed and rainproof composite flange, the composition of the raw material liquid in terms of mass percentage is as follows:

Zn: 6%, Mo: 1.5%, Ti: 1.2%, N: 0.03%, Cr: 11%, Ni: 6%, C: 0.03%, Mn: 0.7%, Nb: 0.6%, Cu: 0.5%, W: 0.7%, Si: 1.0%, P: 0.030%, S: 0.010%, rare earth elements: 0.5%, the rest is Fe and unavoidable impurities;

Rare earth elements include the following components by mass percentage: lanthanum: 8%, cerium: 7%, scandium: 8%, yttrium: 7%, samarium: 13%, gadolinium: 7%, praseodymium: 7%, neodymium: 15% , and the rest are lanthanides, and the sum of the above components is 100%.

In the casting process of the above-mentioned sealed and rainproof composite flange, the composition of the raw material liquid in terms of mass percentage is as follows:

Zn: 4%, Mo: 1.2%, Ti: 1.1%, N: 0.025%, Cr: 9%, Ni: 5%, C: 0.02%, Mn: 0.6%, Nb: 0.4%, Cu: 0.4%, W: 0.6%, Si: 0.9%, P: 0.028%, S: 0.009%, rare earth elements: 0.4%, the rest is Fe and unavoidable impurities;

Rare earth elements include the following components by mass percentage: lanthanum: 7%, cerium: 6%, scandium: 7%, yttrium: 5%, samarium: 12%, gadolinium: 6%, praseodymium: 7%, neodymium: 13% , and the rest are lanthanides, and the sum of the above components is 100%.

In the casting process of the above-mentioned sealed and rainproof composite flange, the tensile strength of the casted first flange and the second flange are both 425MPa, the elongation is 16.5%, and the Brinell hardness is 127HB.

The beneficial effects of the present invention are:

The composite flange of the present invention is composed of the first flange and the second flange, and the left and right butt joints can better fasten the parts. At the same time, the first flange body is provided with a shield, which can have a rainproof function after the butt joint , to avoid rust and corrosion after getting wet, shorten the service life and reduce the cost.

In the present invention, the first flange body and the second flange body are provided with a first protrusion, a first groove, a second protrusion and a second groove, wherein the first protrusion corresponds to the second groove , the second protrusion corresponds to the first groove. After the first flange and the second flange are butted, the first protrusion and the second groove, and the second protrusion and the first groove are stabilized. , and then through the fixing hole bolts to further fix the connection, the double connection strengthens the sealing stability of the flange.

At least four oil injection holes are evenly distributed on the first flange body of the present invention, one oil injection hole corresponds to one first fixing hole, and the oil injection hole is vertically connected with the first fixing hole, which is beneficial to the life caused by excessive time during use. Rust and other states, it is not easy to disassemble, inject lubricating oil through the oil injection hole, which is beneficial to disassembly, and also reduces friction during installation, reduces damage and reduces costs.

The present invention strictly controls the pouring temperature to be 800-900°C. When the pouring temperature is too low or too high, the signal and noise of the mechanical properties of the raw materials are low, and the mechanical properties of the castings are poor. The reason may be that when the pouring temperature is too low, the raw materials After the melt comes into contact with the periphery of the mold, its temperature drops rapidly below the liquidus line, resulting in the formation of a thick solidified shell around the mold arm before the pressure is applied to the raw material melt, and the effective pressure applied to the raw material melt is greatly reduced On the other hand, when the pouring temperature is low, the fluidity of the molten metal is poor, the filling ability is poor, and holes are prone to appear inside the casting; these two aspects are not conducive to the mechanical properties of the casting; when the pouring temperature is too high, the raw material melt The degree of oxidation is large during the transfer process, and the punch is prone to melt splashing during the extrusion process, which reduces the quality of the casting; in addition, there will be defects such as hot spots and shrinkage cavities in the middle of the casting; in addition, the high-temperature metal melt A large amount of heat needs to be released before crystallization. The supercooling effect brought by the pressure is not enough to cause the metal melt to be supercooled at the same time. The number of alloy nuclei is small, which is conducive to the growth of a small number of crystal nuclei formed first. , the pouring temperature of the present invention avoids the disadvantages of the two, ensures the mechanical properties of the casting, and improves the quality of the casting.

When using molding sand to make molds, first place the molding sand in the molding material in an oven for drying and coat a layer of refractory material on the surface of the molding sand before drying. When the molding sand is drying, the molding sand is easily deformed at high temperature. Affects the shape of the mold. Coating refractory materials can reduce the humidity of the molding sand during drying and ensure that the molding sand does not deform. When the original molten iron enters the mold for molding, the generation of gas is reduced due to the reduction of the humidity of the molding sand, thereby reducing The generation of pores on the surface of molded products;

A small amount of copper is added to the raw material solution, and copper can improve hardenability. At the same time, due to the addition of copper element, pearlite and graphite are refined, whitening of thin sections is reduced, and the sensitivity of large section structures is improved; the product strength is improved in terms of mechanical properties. , hardness, toughness; in terms of performance, the product's wear resistance, heat resistance and corrosion resistance are improved, and at the same time, the density of the product is improved;

Perlite is a high-efficiency slag remover. After evenly spreading on the surface of molten iron, it can quickly gather into a slag shell that is easy to separate from the metal solution after a little stirring. After removing the slag shell, pure molten iron can be obtained, reducing Eliminate sand inclusions in castings, improve quality, and the cost of perlite itself is low, and it does not explode or splash during use, safe and reliable, and easy to use. Perlite has no pollution to molten iron, no penetration, and does not affect its chemical composition and the quality of castings. Mechanical properties, smoke-free, dust-free and harmful gas pollution during use, can purify the environment and achieve civilized production;

The heat treatment of tempering, quenching and annealing can improve the comprehensive performance of the product, that is, it has hardness and certain toughness. The determination of the heat treatment temperature should be based on the principle of obtaining uniform and fine austenite grains, so that fine horses can be obtained after quenching. Tenite structure, the growth of austenite grains is proportional to the quenching temperature. Water spraying is used to quickly cool down the product during quenching, and the product is tempered in time, which can not only eliminate the stress generated during quenching, but also obtain certain A large amount of tempered martensite ensures the high hardness of the product and improves the toughness of the product at the same time.

Description of drawings

Fig. 1 is the structural representation of the first flange in the sealing and rainproof composite flange of the present invention;

Fig. 2 is the structural representation of the second flange in the sealing and rainproof composite flange of the present invention;

In the figure: 1-first flange body, 2-shield, 3-first fixing hole, 4-oil injection hole, 5-first bump, 6-first groove, 7-second flange body, 8-the second fixing hole, 9-the second protrusion, 10-the second groove.

detailed description

Example 1

This embodiment provides a casting process for a sealed and rainproof composite flange. The structure is shown in Figures 1 and 2. The cast composite flange includes a first flange and a second flange that are butted left and right, wherein:

The first flange includes a first flange body 1 and a shield 2 arranged on the first flange body 1. The shield 2 is formed by extending outward along the edge of the first flange body 1. On the first flange body 1 There are at least four first fixing holes 3 evenly distributed, the first fixing holes 3 penetrate the first flange body 1, and at least four oil injection holes 4 are evenly distributed on the first flange body 1, one oil injection hole 4 corresponds to one first flange body 1 A fixing hole 3, and the oil injection hole 4 is vertically communicated with the first fixing hole 3, and the first flange body 1 is also evenly distributed with first bumps 5 and first grooves 6 on the surface of the first flange body 1, the first bumps 5, The interval between the first fixing hole 3 and the first groove 6 is distributed;

The second flange includes a second flange body 7, and at least four second fixing holes 8 adapted to the first fixing holes 3 are evenly distributed on the second flange body 7, and are evenly distributed on the second flange body 7. There are second protrusions 9 and second grooves 10, the second protrusions 9 are compatible with the first grooves 6, the second grooves 10 are compatible with the first protrusions 5, the second grooves 10, the second grooves The two fixing holes 8 and the second protrusions 9 are distributed at intervals, and the second groove 10 on the second flange body 7, the second fixing holes 8 and the second protrusions 9 are respectively connected with the first flange body in sequence. The positions of the first protrusion 5, the first fixing hole 3 and the first groove 6 on the 1 are strictly corresponding.

Example 2

This embodiment provides the casting process of the sealing and rainproof composite flange in the above-mentioned embodiment 1, and the composite flange is cast. The casting process of the composite flange specifically includes the following steps:

(1) According to the size of the first flange and the second flange, the molding sand and core sand are used as molding materials to make a mold. Before making the mold, the molding sand in the molding material is first placed in an oven for drying , after drying, coat a layer of release agent on the surface of the mold;

The release agent is made of talcum powder, water, silicone oil, and vegetable oil. The parts by mass are talcum powder: 20 parts, water: 10 parts, silicone oil: 20 parts, vegetable oil: 30 parts, and then use a spray gun to release the mold The agent is sprayed on the surface of the mold cavity with a thickness of 0.05mm;

(2) Place the raw materials of the first flange and the second flange in a well-type crucible resistance furnace for melting. The crucible is now preheated to dark red during melting, and the raw materials of the first flange and the second flange are Place it at the furnace mouth to preheat. When the temperature of the crucible reaches 160°C, spray paint into the crucible, then add the preheated raw materials, and under the protection of the mixed gas, heat up to 1100°C for melting. After all the raw materials are melted and obtained , stirred slightly, then refined and degassed with a dry hexachloroethane preparation, left to stand for 8 minutes, and then sprinkled perlite slagging on the raw material liquid to purify the raw material liquid and immediately removed the slag to obtain the raw material liquid. The composition of the raw material liquid was calculated by mass percentage details as follows:

Zn: 3%, Mo: 1%, Ti: 1%, N: 0.02%, Cr: 8%, Ni: 3%, C: 0.01%, Mn: 0.5%, Nb: 0.3%, Cu: 0.3%, W: 0.5%, Si: 0.8%, P: 0.025%, S: 0.008%, rare earth elements: 0.3%, the rest is Fe and unavoidable impurities;

Rare earth elements include the following components by mass percentage: lanthanum: 5%, cerium: 5%, scandium: 5%, yttrium: 3%, samarium: 10%, gadolinium: 5%, praseodymium: 6%, neodymium: 11% , and the rest are lanthanides, the sum of the above components is 100%;

The paint sprayed in the crucible includes the following components by mass percentage: 62% talcum powder, 5% water glass, 30% water, and 3% boric acid. The sum of the above components is 100%; The mixed gas is specifically 75% compressed air, 24% carbon dioxide and 1% tetrafluoroethane;

(3) Quickly and steadily inject the smelted raw material solution into the mold prepared in step (1) to obtain the casting. The pouring temperature is 850°C and the pouring time is 15 minutes. After the pouring is completed, the casting is cooled to room temperature with the mold , take out the casting;

(4) Solid solution the castings at 550°C for 12 hours, and after water quenching at room temperature, artificially age at 180°C for 9 hours;

(5) Carry out heat treatment on the casting, the specific operation is:

aAnnealing: Heat the casting furnace to 550°C and keep it warm for 6 minutes, then cool the furnace to 350°C, then open the furnace door and continue to cool slowly to 250°C, take out the furnace and air cool to room temperature;

b Quenching: slowly heat the casting annealed in step a to 350°C and keep it warm for 20 minutes, then heat it to 480°C again and then spray the casting with water to quickly cool down;

c Tempering: put the quenched casting into the furnace again at room temperature and heat it to 320°C, keep it warm for 13 minutes, then take it out of the furnace and air cool it to room temperature;

(6) Surface sand blasting and ultrasonic non-destructive testing are carried out on the heat-treated castings in sequence, and those that pass the test are finally put into storage.

Example 3

This embodiment provides the casting process of the sealing and rainproof composite flange in the above-mentioned embodiment 1, and the composite flange is cast. The casting process of the composite flange specifically includes the following steps:

(1) According to the size of the first flange and the second flange, the molding sand and core sand are used as molding materials to make a mold. Before making the mold, the molding sand in the molding material is first placed in an oven for drying , after drying, coat a layer of release agent on the surface of the mold;

The release agent is made of talcum powder, water, silicone oil, and vegetable oil. In terms of parts by mass, it is specifically talcum powder: 30 parts, water: 20 parts, silicone oil: 30 parts, vegetable oil: 40 parts, and then use a spray gun to release the mold The agent is sprayed on the surface of the mold cavity with a thickness of 0.1mm;

(2) Place the raw materials of the first flange and the second flange in a well-type crucible resistance furnace for melting. The crucible is now preheated to dark red during melting, and the raw materials of the first flange and the second flange are Place it at the furnace mouth to preheat. When the temperature of the crucible reaches 170°C, spray paint into the crucible, then add the preheated raw materials, and under the protection of the mixed gas, heat up to 1200°C for melting. After all the raw materials are melted and obtained , slightly stirred, then refined and degassed with a dry hexachloroethane preparation, allowed to stand for 10 minutes, and then sprinkled perlite slagging on the raw material liquid to purify the raw material liquid and immediately removed the slag to obtain the raw material liquid. The composition of the raw material liquid was calculated by mass percentage details as follows:

Zn: 6%, Mo: 1.5%, Ti: 1.2%, N: 0.03%, Cr: 11%, Ni: 6%, C: 0.03%, Mn: 0.7%, Nb: 0.6%, Cu: 0.5%, W: 0.7%, Si: 1.0%, P: 0.030%, S: 0.010%, rare earth elements: 0.5%, the rest is Fe and unavoidable impurities;

Rare earth elements include the following components by mass percentage: lanthanum: 8%, cerium: 7%, scandium: 8%, yttrium: 7%, samarium: 13%, gadolinium: 7%, praseodymium: 7%, neodymium: 15% , and the rest are lanthanides, the sum of the above components is 100%;

The paint sprayed in the crucible includes the following components by mass percentage: 62% talcum powder, 5% water glass, 30% water, and 3% boric acid. The sum of the above components is 100%; The mixed gas is specifically 75% compressed air, 24% carbon dioxide and 1% tetrafluoroethane;

(3) Quickly and steadily inject the smelted raw material solution into the mold prepared in step (1) to obtain the casting. The pouring temperature is 800°C and the pouring time is 12 minutes. After the pouring is completed, the casting is cooled to room temperature with the mold , take out the casting;

(4) Solid solution the castings at 560°C for 10 hours, and after water quenching at room temperature, artificially age at 185°C for 8 hours;

(5) Carry out heat treatment on the casting, the specific operation is:

aAnnealing: heat the casting furnace to 600°C for 8 minutes, then cool the furnace to 400°C, then open the furnace door and continue to cool slowly to 200°C, take out the furnace and air cool to room temperature;

b Quenching: slowly heat the casting annealed in step a to 300°C and keep it warm for 10 minutes, heat it again to 450°C, and then spray the casting with water to quickly cool down;

c Tempering: put the quenched casting into the furnace again at room temperature and heat it to 350°C, keep it warm for 10 minutes, and then take it out of the furnace and air cool it to room temperature;

(6) Surface sand blasting and ultrasonic non-destructive testing are carried out on the heat-treated castings in sequence, and those that pass the test are finally put into storage.

Example 4

This embodiment provides the casting process of the sealing and rainproof composite flange in the above-mentioned embodiment 1, and the composite flange is cast. The casting process of the composite flange specifically includes the following steps:

(1) According to the size of the first flange and the second flange, the molding sand and core sand are used as molding materials to make a mold. Before making the mold, the molding sand in the molding material is first placed in an oven for drying , after drying, coat a layer of release agent on the surface of the mold;

The release agent is made of talcum powder, water, silicone oil, and vegetable oil. In terms of parts by mass, it is specifically talcum powder: 25 parts, water: 15 parts, silicone oil: 25 parts, vegetable oil: 35 parts, and then use a spray gun to release the mold The agent is sprayed on the surface of the mold cavity with a thickness of 0.08mm;

(2) Place the raw materials of the first flange and the second flange in a well-type crucible resistance furnace for melting. The crucible is now preheated to dark red during melting, and the raw materials of the first flange and the second flange are Place it at the furnace mouth for preheating. When the temperature of the crucible reaches 150°C, spray paint into the crucible, then add the preheated raw materials, and under the protection of the mixed gas, heat up to 1000°C for melting. After all the raw materials are melted and obtained , stirred slightly, then refined and degassed with a dry hexachloroethane preparation, let it stand for 9 minutes, then sprinkled perlite slagging on the raw material liquid to purify the raw material liquid and immediately removed the slag to obtain the raw material liquid, and calculated the raw material liquid composition by mass percentage details as follows:

Zn: 4%, Mo: 1.2%, Ti: 1.1%, N: 0.025%, Cr: 9%, Ni: 5%, C: 0.02%, Mn: 0.6%, Nb: 0.4%, Cu: 0.4%, W: 0.6%, Si: 0.9%, P: 0.028%, S: 0.009%, rare earth elements: 0.4%, the rest is Fe and unavoidable impurities;

Rare earth elements include the following components by mass percentage: lanthanum: 7%, cerium: 6%, scandium: 7%, yttrium: 5%, samarium: 12%, gadolinium: 6%, praseodymium: 7%, neodymium: 13% , and the rest are lanthanides, the sum of the above components is 100%;

The paint sprayed in the crucible includes the following components by mass percentage: 62% talcum powder, 5% water glass, 30% water, and 3% boric acid. The sum of the above components is 100%; The mixed gas is specifically 75% compressed air, 24% carbon dioxide and 1% tetrafluoroethane;

(3) Quickly and steadily inject the smelted raw material solution into the mold prepared in step (1) to obtain the casting. The pouring temperature is 900°C and the pouring time is 9 minutes. After the pouring is completed, the casting is cooled to room temperature with the mold , take out the casting;

(4) Solid solution the castings at 540°C for 11 hours, and after water quenching at room temperature, artificially age at 175°C for 10 hours;

(5) Carry out heat treatment on the casting, the specific operation is:

a Annealing: Heat the casting furnace to 500°C and keep it warm for 5 minutes, then cool the furnace to 300°C, then open the furnace door and continue to cool slowly to 220°C, take out the furnace and air cool to room temperature;

b Quenching: slowly heat the casting annealed in step a to 380°C and keep it warm for 15 minutes, then heat the furnace again to 500°C and then spray the casting with water to quickly cool down;

c Tempering: Put the quenched casting into the furnace again at room temperature and heat it to 300°C, keep it for 12 minutes, and then take it out of the furnace and air cool it to room temperature;

(6) Surface sand blasting and ultrasonic non-destructive testing are carried out on the heat-treated castings in sequence, and those that pass the test are finally put into storage.

The tensile strength of the first flange and the second flange cast in the above embodiments 1-4 are both 425MPa, the elongation is 16.5%, and the Brinell hardness is 127HB.

In addition to the above-mentioned embodiments, the present invention can also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims (5)

1. a casting technique that seals rainproof composite flange, is characterized in that: the composite flange casting out comprises the first flange and second flange of left and right docking, wherein:

Described the first flange comprises the first flange body (1) and is arranged on the guard shield (2) in the first flange body (1), described guard shield (2) is along the formation that stretches out of the first flange body (1) edge, in described the first flange body (1), be evenly equipped with at least four the first fixing holes (3), described the first fixing hole (3) penetrates the first flange body (1), upper also uniform at least four oil filler points (4) of described the first flange body (1), corresponding first fixing hole of an oil filler point (4) (3), and described oil filler point (4) and the vertical UNICOM of described the first fixing hole (3), on the surface of described the first flange body (1), be also evenly equipped with respectively the first projection (5) and the first groove (6), described the first projection (5), spaced apart between the first fixing hole (3) and the first groove (6),

Described the second flange comprises the second flange body (7), upper uniform at least four second fixing holes (8) adaptive with described the first fixing hole (3) of described the second flange body (7), in described the second flange body (7), be also evenly equipped with respectively the second projection (9) and the second groove (10), described the second projection (9) is suitable with described the first groove (6), described the second groove (10) is suitable with described the first projection (5), described the second groove (10), spaced apart between the second fixing hole (8) and the second projection (9), and the second groove (10) in described the second flange body (7), the second fixing hole (8) and the second projection (9) according to the order of sequence respectively with the first flange body (1) on the first projection (5), the position of the first fixing hole (3) and the first groove (6) is strictly corresponding,

This composite flange casting technique specifically comprises the following steps:

(1) make casting mold taking molding sand and core sand as Modeling Material according to the size of the first flange and the second flange, making before casting mold, first the molding sand in Modeling Material is placed in to baker and dries, after oven dry, apply one deck releasing agent at mo(U)ld face;

Described releasing agent adopts talcum powder, water, silicone oil, vegetable oil allotment to form, be specially according to the mass fraction talcum powder: 20-30 part, water: 10-20 part, silicone oil: 20-30 part, vegetable oil: 30-40 part, then with spray gun, releasing agent is sprayed on mold cavity surface, thickness is 0.05-0.1mm;

(2) raw material of the first flange and the second flange are placed in well formula crucible electrical resistance furnace and carry out melting, when melting, now crucible is preheated to kermesinus, the raw material of the first flange and the second flange are placed on to fire door preheating simultaneously, in the time that crucible temperature arrives 150-170 DEG C, to sprayed coating in crucible, then add preheated raw material, under the protection of mist, being warming up to 1000-1200 DEG C melts, after whole meltings obtain raw material liquid, gentle agitation, carry out refining degasification with dry carbon trichloride preparation subsequently, leave standstill 8-10min, then on raw material liquid, the slag making of spreading perlite obtains raw material liquid to purify raw material liquid and to skim at once, raw material liquid composition is specific as follows by mass percentage:

Zn:3-6%, Mo:1-1.5%, Ti:1-1.2%, N:0.02-0.03%, Cr:8-11%, Ni:3-6%, C:0.01-0.03%, Mn:0.5-0.7%, Nb:0.3-0.6%, Cu:0.3-0.5%, W:0.5-0.7%, Si:0.8-1.0%, P:0.025-0.030%, S:0.008-0.010%, rare earth element: 0.3-0.5%, all the other are Fe and inevitable impurity;

Described rare earth element comprises following component by mass percentage: lanthanum: 5-8%, and cerium: 5-7%, scandium: 5-8%, yttrium: 3-7%, samarium: 10-13%, gadolinium: 5-7%, praseodymium: 6-7%, neodymium: 11-15%, all the other are lanthanide series, above each component sum is 100%;

The coating being sprayed in crucible comprises following composition by mass percentage: 62% talcum powder, 5% waterglass, 30% water and 3% boric acid, and above each component sum is 100%; Mist in the time of melting is specially the HFC-134a of 75% compressed air, 24% carbon dioxide and 1%;

(3) in the casting mold preparing in the implantation step (1) of raw material liquid quick and stable after smelting, obtain foundry goods, pouring temperature is 800-900 DEG C, and be 9-15min the duration of pouring, after being poured, during with casting mold cool to room temperature, takes out foundry goods until foundry goods;

(4) to foundry goods at 540-560 DEG C of solid solution 10-12h, under room temperature after shrend, at timeliness 175-185 DEG C of artificial aging 8-10h;

(5) foundry goods is heat-treated, concrete operations are:

A annealing: foundry goods stove heat is incubated to 5-8min during to 500-600 DEG C, and then stove is cooled to 300-400 DEG C, opens subsequently fire door and continues slow cooling to the 200-250 DEG C of air cooling of coming out of the stove to room temperature;

B quenches: by the slow stove heat of foundry goods after annealing in step a, to 300-380 DEG C and be incubated 10-20min, stove heat is to water spray foundry goods fast cooling after 450-500 DEG C again;

C tempering: the foundry goods after quenching is at room temperature entered after stove stove heat are incubated 10-13min after to 300-350 DEG C to come out of the stove air cooling to room temperature again;

(6) foundry goods after heat treatment is carried out to surface sand-blasting cleaning, Ultrasonic NDT successively, detect qualified final warehouse-in.

2. the casting technique of the rainproof composite flange of sealing according to claim 1, is characterized in that: raw material liquid composition is specific as follows by mass percentage:

Zn:3%, Mo:1%, Ti:1%, N:0.02%, Cr:8%, Ni:3%, C:0.01%, Mn:0.5%, Nb:0.3%, Cu:0.3%, W:0.5%, Si:0.8%, P:0.025%, S:0.008%, rare earth element: 0.3%, all the other are Fe and inevitable impurity;

Described rare earth element comprises following component by mass percentage: lanthanum: 5%, and cerium: 5%, scandium: 5%, yttrium: 3%, samarium: 10%, gadolinium: 5%, praseodymium: 6%, neodymium: 11%, all the other are lanthanide series, above each component sum is 100%.

3. the casting technique of the rainproof composite flange of sealing according to claim 1, is characterized in that: raw material liquid composition is specific as follows by mass percentage:

Zn:6%, Mo:1.5%, Ti:1.2%, N:0.03%, Cr:11%, Ni:6%, C:0.03%, Mn:0.7%, Nb:0.6%, Cu:0.5%, W:0.7%, Si:1.0%, P:0.030%, S:0.010%, rare earth element: 0.5%, all the other are Fe and inevitable impurity;

Described rare earth element comprises following component by mass percentage: lanthanum: 8%, and cerium: 7%, scandium: 8%, yttrium: 7%, samarium: 13%, gadolinium: 7%, praseodymium: 7%, neodymium: 15%, all the other are lanthanide series, above each component sum is 100%.

4. the casting technique of the rainproof composite flange of sealing according to claim 1, is characterized in that: raw material liquid composition is specific as follows by mass percentage:

Zn:4%, Mo:1.2%, Ti:1.1%, N:0.025%, Cr:9%, Ni:5%, C:0.02%, Mn:0.6%, Nb:0.4%, Cu:0.4%, W:0.6%, Si:0.9%, P:0.028%, S:0.009%, rare earth element: 0.4%, all the other are Fe and inevitable impurity;

Described rare earth element comprises following component by mass percentage: lanthanum: 7%, and cerium: 6%, scandium: 7%, yttrium: 5%, samarium: 12%, gadolinium: 6%, praseodymium: 7%, neodymium: 13%, all the other are lanthanide series, above each component sum is 100%.

5. the casting technique of the rainproof composite flange of sealing according to claim 1, is characterized in that: the first flange casting out and the tensile strength of the second flange are 425MPa, and percentage elongation is 16.5%, and Brinell hardness is 127HB.