CN111496227A - Double-liquid composite casting method - Google Patents
Double-liquid composite casting method Download PDFInfo
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- CN111496227A CN111496227A CN202010420468.1A CN202010420468A CN111496227A CN 111496227 A CN111496227 A CN 111496227A CN 202010420468 A CN202010420468 A CN 202010420468A CN 111496227 A CN111496227 A CN 111496227A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
Abstract
The invention discloses a double-liquid composite casting method in the field of casting. A high-chromium cast iron overflow port and a carbon steel overflow port are designed at a bimetal joint surface, after the high-chromium cast iron is poured, a protective agent is scattered, the protective agent consists of a low-melting-point quenching agent and a calcium metasilicate heat insulating agent, the low-melting-point quenching agent is scattered firstly, a crust is formed on the surface of the high-chromium cast iron, and then the calcium metasilicate heat insulating agent is scattered. Pouring carbon steel metal liquid, after the protective agent is discharged from the carbon steel overflow port, blocking the carbon steel overflow port, and using a twisted steel bar to destroy crusts. The low-melting-point quenching agent comprises a base material, a cosolvent and a quenching agent, wherein the base material comprises lime and bauxite, the cosolvent comprises borax and cryolite, and the quenching agent comprises tellurium powder and soda. The bimetal composite wear-resistant part produced by the method has good metallurgical composite quality, strong binding force, less double-liquid fusion amount, stable component control and improved qualified rate of bimetal composite.
Description
Technical Field
The invention is applied to the field of casting, relates to double-metal double-liquid composite casting, and particularly provides a double-liquid composite casting method using a protective agent.
Background
The bimetal compounding is mainly used in the field of wear resistance, such as a bimetal wear-resistant plate, a bimetal wear-resistant hammer head, a bimetal wear-resistant pipe, a bimetal roller and the like, which are compounded by wear-resistant materials and carbon steel or low alloy steel, wherein the wear-resistant materials are high-chromium cast iron generally, and corrosion-resistant stainless steel and low alloy steel generally are compounded, such as 304L/20 g bimetal extrusion billet and the like, and the common characteristic is that the two materials have larger difference of melting points, the melting point of the high-chromium cast iron is about 1300 ℃, the melting point of 304L is about 1340 ℃, and the melting point of the low alloy steel or the carbon steel is generally over 1480 ℃.
In the double-liquid composite casting process, the quality of the casting powder directly determines the success or failure of the product. The casting powder or the protective agent for the double-liquid composite casting is mostly used in centrifugal casting composite tubular castings, the casting powder is used in patent documents CN101530897B, CN101774010B and CN104308113B and is used for protecting a bimetal joint surface, only the usage is different, the casting powder in CN101530897B and CN101774010B is added into molten steel and is poured together with the molten steel, the casting powder has the function of cleaning and purifying the molten steel by slag washing, and the casting powder in CN104308113B is added into a casting mould after the outer layer is poured. The centrifugal casting can realize steel slag separation under the action of centrifugal force, so that the technology of the covering slag is mature in the production of the centrifugal casting composite pipe. However, in the traditional cavity casting process, the mold powder technology is still in the exploration and development stage, such as the bimetallic hammer head and the bimetallic wear-resisting plate which are relatively mature in process. Both products belong to the composite of wear resistance and toughness, so that the problem that a single steel material cannot meet the requirements of wear resistance and high toughness at the same time is solved. In actual production, many factors influence the bonding quality of the bimetal bonding surface, wherein the key factors include heat dissipation conditions, bonding surface temperature, casting temperature of the second layer of metal, bonding surface quality and the like. In actual production, the parameters of the double-liquid composite pouring process are greatly changed due to the complex conditions of environmental factors, operational factors, thought factors and the like, and the qualified rate of double-liquid composite products is low.
Disclosure of Invention
The technical problem solved by the invention is as follows: the double-liquid composite casting method is provided, and after the protective agent is used and the shell is formed through quenching, the joint surface is protected from being polluted, and the quality of double-metal composite is ensured.
The technical scheme adopted by the invention is as follows: firstly pouring high-chromium cast iron molten metal, then pouring carbon steel molten metal, and designing a pouring system with an open riser, wherein the carbon steel pouring system is open. A high-chromium cast iron overflow port and a carbon steel overflow port are designed at the bimetal joint surface, and the position of the carbon steel overflow port is opposite to the position of the carbon steel ingate; after the high-chromium cast iron metal liquid is poured, a protective agent is scattered from the open riser, the protective agent consists of a low-melting-point quenching agent and a calcium metasilicate heat preservation agent, the low-melting-point quenching agent is firstly scattered, the surface of the high-chromium cast iron metal liquid is quenched to form crusts, and then the calcium metasilicate heat preservation agent is scattered. Pouring carbon steel molten metal, discharging the protective agent from the carbon steel overflow outlet, blocking the carbon steel overflow outlet by refractory mortar, and inserting the twisted steel bar from the open riser to destroy crusts.
Further, if a sand core is shielded under the open riser, a three-box molding is adopted. The carbon steel is a general term and includes not only carbon steel in the metallurgical sense but also low alloy steel in the metallurgical sense.
Further, the low-melting-point quenching agent comprises a base material, a cosolvent and a quenching agent; the base material comprises lime and bauxite; the cosolvent comprises borax and cryolite; the quenching agent comprises tellurium powder and soda. The low-melting-point quenching agent comprises the following materials in percentage by weight: 15-25% of lime, 15-25% of bauxite, 10-20% of borax, 15-25% of cryolite, 3-6% of tellurium powder and 15-25% of soda. The weight of the calcium metasilicate heat preservation agent is 10-30% of that of the low melting point quenching agent.
Furthermore, the high-chromium cast iron overflow port and the carbon steel overflow port are combined into a whole, and only the carbon steel overflow port is reserved.
Further, the inserted rebar becomes part of the connecting bimetal coupling without being removed.
The invention has the beneficial effects that: the bimetal composite wear-resistant part produced by the method has good metallurgical composite quality, strong binding force, small double-liquid fusion amount, stable component control, convenient heat treatment of wear-resistant materials and ensured respective performances of the bimetal. The casting method uses the protective agent to quickly crust, protects the high-chromium cast iron joint surface, widens the process operation range and improves the qualification rate of bimetal compounding.
Drawings
FIG. 1 is a schematic view of a gating system according to example 1;
FIG. 2 is a schematic view of a hammer-tip gating system according to example 1;
FIG. 3 is a schematic view of a gating system according to example 2;
FIG. 4 is a left side view of FIG. 3;
wherein: 1-upper box, 2-middle box, 3-lower box, 4-chill I, 5-hammer end cavity, 6-hammer handle cavity, 7-sand core, 8-high chromium cast iron sprue cup, 9-high chromium cast iron sprue I, 10-high chromium cast iron ingate I, 11-high chromium cast iron overflow outlet I, 12-carbon steel sprue cup, 13-carbon steel sprue I, 14-carbon steel ingate I, 15-carbon steel overflow outlet I and 16-carbon steel riser I;
21-high chromium cast iron sprue II, 22-high chromium cast iron ingate II, 23-chill II, 24-wear-resistant cavity, 25-high chromium cast iron overflow outlet II, 26-carbon steel riser II, 27-carbon steel cavity, 28-carbon steel overflow outlet II, 29-carbon steel sprue II and 30-carbon steel ingate II.
Detailed Description
The protective agent used in the invention comprises a low-melting-point quenching agent and a heat insulating agent, and when the protective agent is used, the low-melting-point quenching agent and the heat insulating agent are added in two times. The low-melting point quenching agent comprises a base stock, a cosolvent and a quenching agent. The base material comprises lime and bauxite, the cosolvent comprises borax and cryolite, the quenching agent comprises tellurium powder and soda, and the low-melting-point quenching agent comprises the following materials in percentage by weight: 15-25% of lime, 15-25% of bauxite, 10-20% of borax, 15-25% of cryolite, 3-6% of tellurium powder and 15-25% of soda. The heat preserving agent is calcium metasilicate, and the weight of the heat preserving agent is 10-30% of that of the low melting point quenching agent.
Example 1: and (4) carrying out double-liquid composite casting on the bimetal hammer.
The bimetal hammer head is formed by compounding a high-chromium cast iron hammer end and a carbon steel or low alloy steel hammer handle so as to meet the unification of wear resistance and high toughness. The attached figure 1 is a schematic diagram of a bi-metal hammer head pouring system, a molding sand box comprises an upper box 1, a middle box 2 and a lower box 3, a hammer end cavity 5 is arranged at the lower part of a cavity, a hammer handle cavity 6 is arranged at the upper part of the cavity, a chilling block I4 is arranged at the bottom of the hammer end cavity 5, and a sand core 7 forming a hammer head mounting hole is arranged in the hammer handle cavity 6.
Before pouring of the hammer-end high-chromium cast iron molten metal, the middle box 2 and the lower box 3 are positioned and assembled, as shown in the attached drawing 2, a high-chromium cast iron pouring cup 8, a high-chromium cast iron sprue I9, a high-chromium cast iron ingate I10 and a high-chromium cast iron overflow outlet I11 jointly form a pouring system of the hammer end, and the high-chromium cast iron overflow outlet I11 is located at a joint surface of the hammer handle and the hammer end. When the molten metal of the high-chromium cast iron is poured, the molten metal filling condition can be observed from the hammer handle cavity 6, when the hammer end cavity 5 is full of molten metal or the high-chromium cast iron overflow port I11 overflows the molten metal, pouring is stopped, the molten metal in the high-chromium cast iron sprue I9 continues to fill the hammer end cavity 5 under the action of gravity, and redundant molten metal overflows from the high-chromium cast iron overflow port I11. When the molten metal in the high-chromium cast iron overflow port I11 stops flowing, the high-chromium cast iron overflow port I11 is blocked by refractory mortar, a low-melting-point quenching agent is sprinkled into the hammer handle cavity 6, and then a calcium metasilicate heat preservation agent is sprinkled into the hammer handle cavity.
The material proportion of the low-melting-point quenching agent is as follows: 1) 16% of lime, 16% of bauxite, 18% of borax, 24% of cryolite, 6% of tellurium powder and 20% of soda; 2) 25% of lime, 25% of bauxite, 10% of borax, 20% of cryolite, 5% of tellurium powder and 15% of soda; the addition amount of the low-melting-point quenching agent is 100g, and the addition amount of the calcium metasilicate heat preserving agent is 30g, which is 30 percent of the weight of the low-melting-point quenching agent. The heat insulating agent has higher addition amount and good heat insulating effect, and ensures the temperature gradient of the high-chromium cast iron in the vertical direction together with the chilling block 4 to prevent serious bidirectional solidification. The obvious difference between the two proportions of the low-melting-point quenching agent is that the addition amount of the quenching agent is slightly larger than that of the quenching agent and the cosolvent in the proportion 1) than that in the proportion 2), and the dosage of the low-melting-point cosolvent is increased under the condition of stronger quenching.
After the low-melting-point quenching agent is added, tellurium powder is evaporated and soda is decomposed, the strong heat absorption of the tellurium powder enables the surface of the high-chromium cast iron to be crusted, and borax is rapidly melted and wraps lime, bauxite and cryolite to promote reaction and fluxing among the high-chromium cast iron, the high-chromium cast iron and the cryolite. After the calcium metasilicate heat insulating agent is sprinkled, a liquid slag layer is formed on the surface of the crust, and the powdery calcium metasilicate heat insulating agent is covered on the liquid slag layer for heat insulation. And (3) quenching the chilling block 4 to ensure that the molten metal of the high-chromium cast iron is subjected to downward heat transfer and solidification and liquid contraction to form shrinkage cavities or looseness under the crust.
After the high-chromium cast iron metal liquid is poured, the high-chromium cast iron pouring cup 8 is taken down, the sand core 7 is placed, and the upper box 1 with the carbon steel pouring cup 12 is assembled, as shown in the attached drawing 1. The carbon steel pouring cup 12, the carbon steel sprue I13, the carbon steel ingate I14, the carbon steel overflow outlet I15 and the carbon steel riser I16 form a hammer handle carbon steel molten metal open type pouring system, and the carbon steel overflow outlet I15 is positioned on a crust surface. The pouring time of the molten metal of the carbon steel is determined by the interval time simulated by a computer, the high-chromium cast iron is multi-element alloy, the solidification process is carried out in a temperature interval, the computer simulates according to the temperature in the solidification interval, the high-chromium cast iron is in a liquid-solid two phase state at the temperature, and the molten metal of the carbon steel is poured at the moment. The open type pouring system ensures that the carbon steel molten metal is not turbulent and fills the mold, the carbon steel molten metal which is poured at the beginning is stably filled from the carbon steel ingate I14, and the protective agent on the incrustation surface is pushed out from the carbon steel overflow port I15 at the position opposite to the carbon steel ingate I14 and cleaned. The refractory mortar is used for blocking a carbon steel overflow port I15, and meanwhile, a twisted steel bar is inserted into a carbon steel riser I16 to break a crust, and carbon steel metal liquid enters the porosity and shrinkage cavity of high-chromium cast iron below the crust layer to be fused with high-temperature columnar crystals. Normally, the temperature of the carbon steel molten metal flowing into the cavity is about 1530-1560 ℃, the melting point of the high-chromium cast iron is about 1300 ℃, and the carbon steel molten metal melts the high-chromium cast iron which is just solidified, so that the two are metallurgically combined. Because the bonding surface of the high-chromium cast iron is pure in a vacuum state of crusting protection, the high-chromium cast iron provides guarantee for high-quality metallurgical bonding. And cladding unmelted crust in molten metal of carbon steel to form mosaic structure in carbon steel. The damascene structure and metallurgical fusion strengthen the bonding force of the bimetal.
When the carbon steel metal liquid is filled in the carbon steel riser I16, stopping pouring, and adding a heat preservation agent for heat preservation. The protective agent which is not discharged from the carbon steel overflow port I15 is discharged into the carbon steel riser I16 by the stably rising molten metal, and the carbon steel riser I16 has the functions of feeding molten steel and collecting slag.
In the two-liquid compounding process, lime and bauxite crust on the surface of molten metal does not have the function of adsorbing impurities on the surface of molten steel but has the function of increasing the density of the protective slag, so that the heat-insulating agent of calcium metasilicate floats on the liquid slag, calcium metasilicate granules are prevented from entering the liquid slag, the liquidity of the liquid slag is reduced, and the heat-insulating property of the calcium metasilicate is ensured.
The bimetal hammer produced by the method has good bimetal composite quality, strong binding force, small amount of double-liquid fusion and stable control of carbon steel components, lays a foundation for the heat treatment of the subsequent hammer and ensures the respective performances of the bimetal. The method of pouring high-chromium cast iron first and then pouring carbon steel is adopted, so that the metal utilization rate of the high-chromium cast iron is improved, and the alloy material cost is reduced. The casting method uses the protective agent to quickly crust, protects the high-chromium cast iron joint surface, widens the process operation range and improves the qualification rate of bimetal compounding.
The two formulas can meet the requirement of double-liquid pouring hammer heads, and the proportion of a quenching agent and a cosolvent is more prone to be adopted only when the pouring temperature of the high-chromium cast iron metal liquid is higher.
If the hammer handle is made of low alloy steel instead of carbon steel, the composite casting process has the same method, and only the carbon steel is replaced by the alloy steel.
Example 2: a bimetallic wear plate.
The bimetal wear-resisting plate is formed by compounding high-chromium cast iron and carbon steel or low alloy steel, the wear-resisting layer is a working layer, the material is the high-chromium cast iron, and the carbon steel or low alloy steel layer is a base layer. Fig. 3 and 4 are schematic diagrams of a bi-metal wear plate casting system, a plate type cavity is formed after a sand box is assembled, the upper part is a carbon steel cavity 27, the lower part is a wear-resistant cavity 24, and a chill II 23 is designed at the bottom of the wear-resistant cavity 24. The high-chromium cast iron pouring system comprises a high-chromium cast iron sprue II 21, a high-chromium cast iron ingate II 22 and a high-chromium cast iron overflow outlet II 25. The carbon steel or low alloy steel pouring system comprises a carbon steel sprue II 29, a carbon steel ingate II 30, a carbon steel overflow outlet II 28 and a carbon steel riser II 26. Wherein the high-chromium cast iron overflow outlet II 25 and the carbon steel overflow outlet II 28 are designed at the bimetal joint.
Firstly pouring high-chromium cast iron, enabling molten metal of the high-chromium cast iron to enter a wear-resistant cavity 24 from a high-chromium cast iron sprue II 21 and a high-chromium cast iron ingate II 22, stopping pouring when the molten metal flows out of a high-chromium cast iron overflow outlet II 25, blocking the high-chromium cast iron overflow outlet II 25 by using refractory mortar when the molten metal of the high-chromium cast iron overflow outlet II 25 does not flow, simultaneously spraying a protective agent from a carbon steel riser II 26, firstly spraying a low-melting-point quenching agent, and then spraying a calcium metasilicate heat insulating agent.
The material ratio of the low-melting-point quenching agent is 20 percent of lime, 20 percent of bauxite, 20 percent of borax, 25 percent of cryolite, 3 percent of tellurium powder and 25 percent of soda, the adding amount of the low-melting-point quenching agent is 200-300g, and the adding amount of the calcium metasilicate heat preserving agent is 20-30g, which is 10 percent of the low-melting-point quenching agent.
After the low-melting-point quenching agent is added, tellurium powder and soda strongly absorb heat to enable the surface of the high-chromium cast iron metal liquid to be crusted, and borax is rapidly melted to wrap lime, bauxite and cryolite, so that the reaction and fluxing among the three are promoted. After the heat insulating agent calcium metasilicate is sprinkled, a low-melting-point liquid slag layer is formed on the surface of the crust, and the low-melting-point liquid slag layer is covered with the powdery heat insulating agent calcium metasilicate. And the chilling block II 23 enables the high-chromium cast iron molten metal to transfer heat downwards and solidify, and liquid state shrinks, so that shrinkage cavities or looseness are formed below the crust.
The pouring time of the carbon steel metal liquid is determined by the interval time simulated by the computer, the solidification process of the high-chromium cast iron is carried out in a temperature interval, the computer simulates according to the temperature in the solidification interval, the bonding surface of the high-chromium cast iron is a liquid-solid two-phase coexistence at the temperature, and the carbon steel metal liquid is poured at the moment. The open type pouring system ensures that the carbon steel molten metal is not turbulent and fills the mold, the carbon steel molten metal which is poured at the beginning is stably filled from the carbon steel ingate II 30, and the protective agent on the incrustation surface is pushed out from the carbon steel overflow outlet II 28 and cleaned. And (3) quickly blocking the carbon steel overflow outlet II 28 by using refractory mortar, inserting a twisted steel bar into the carbon steel riser II 26, breaking the crust, and enabling the carbon steel molten metal to enter the porosity and shrinkage cavity of the high-chromium cast iron below the crust layer to be fused with the high-temperature columnar crystals. Typically, the temperature of the carbon steel melt flowing into the mold cavity is about 1530-1560 ℃, while the melting point of the high chromium cast iron is about 1300 ℃, and the carbon steel melt melts the as-solidified high chromium cast iron, so that the two are metallurgically bonded. Because the bonding surface of the high-chromium cast iron is pure in a vacuum state of crusting protection, the high-chromium cast iron provides guarantee for high-quality metallurgical bonding. The twisted steel is not pulled out after being inserted, the two layers of double metals form an embedded composite structure through the twisted steel, and the structure and metallurgical fusion strengthen the combination between the double metal layers.
And stopping pouring when the carbon steel metal liquid is filled in the carbon steel riser II 26, and adding a heat preservation agent for heat preservation. The stably rising molten metal discharges the protective agent which is not discharged from the carbon steel overflow outlet II 28 into the carbon steel riser II 26, and the carbon steel riser II 26 has the double functions of feeding molten steel and collecting slag.
The effect of lime and bauxite in this example was the same as in example 1, and was used to increase the density of the liquid slag. If the carbon steel material is changed into low alloy steel, the composite casting process method is not changed.
The bimetal wear-resisting plate produced by the method has good bimetal composite quality, strong binding force, small amount of double-liquid fusion and stable control of carbon steel components, lays a foundation for the heat treatment of subsequent wear-resisting materials and ensures the respective performances of the bimetal. The method of pouring high-chromium cast iron first and then pouring carbon steel is adopted, so that the metal utilization rate of the high-chromium cast iron is improved, and the alloy material cost is reduced. The casting method uses the protective agent to quickly crust, protects the high-chromium cast iron joint surface, widens the process operation range and improves the qualification rate of bimetal compounding.
In summary, the two-liquid composite casting method is mainly characterized in that:
1) firstly, pouring low-melting-point metal liquid, such as high-chromium cast iron metal liquid, and then pouring high-melting-point metal liquid, such as carbon steel or low-alloy steel metal liquid;
2) the high-chromium cast iron overflow port and the carbon steel overflow port are both positioned at the bimetal joint. The high-chromium cast iron overflow port aims at ensuring the position of a joint surface or the thickness of a wear-resistant layer, and the carbon steel overflow port aims at removing a protective agent, so that the position of the carbon steel overflow port is opposite to a carbon steel ingate and is more important than the high-chromium cast iron overflow port, therefore, the high-chromium cast iron overflow port can be omitted, and only the carbon steel overflow port is reserved;
3) during molding, an open riser capable of being sprinkled with a protective agent is required to be designed, and the riser has a slag collecting effect. When a sand core is shielded below the open riser, a three-box molding is adopted to ensure the smooth operation of spreading the protective agent and installing the sand core;
4) after the high-chromium cast iron metal liquid is poured, the protecting agent is immediately sprinkled, the low-melting-point quenching agent is sprinkled firstly, and then the calcium metasilicate heat preservation agent is sprinkled. A low melting point quencher can crust the metal level while maintaining good fluidity. The heat insulating agent is beneficial to sequential solidification of the metal liquid, and shrinkage cavities or looseness are formed on the lower surface of the crust;
5) the interval time is determined by computer simulation, and liquid surface incrustation or temperature conditions cannot be observed due to the fact that the surface of the molten metal is covered with the protective agent. In mass production and under the condition of stable process operation, the interval time can be determined empirically, but the basis of the interval time is still computer simulation;
6) the pouring system of the molten carbon steel is an open pouring system, so that the molten carbon steel is prevented from generating turbulence, and the discharge of a protective agent is facilitated;
7) after the protective agent is discharged, the carbon steel overflow outlet is blocked by refractory mortar, a twisted steel bar is inserted from an open riser to break a crust, so that high-temperature carbon steel molten metal is contacted with low-melting-point metal, and at the moment, the bonding surface is protected by the crust, so that the bonding surface is clean and the metallurgical bonding is good;
8) the inserted rebar may become part of the connecting bi-metallic joint without removal.
Claims (8)
1. A double-liquid composite casting method comprises the steps of firstly pouring high-chromium cast iron molten metal, then pouring carbon steel molten metal, designing an open riser, and opening a carbon steel pouring system, and is characterized in that: a high-chromium cast iron overflow port and a carbon steel overflow port are designed at the bimetal joint surface, and the position of the carbon steel overflow port is opposite to the position of the carbon steel ingate; after the high-chromium cast iron metal liquid is poured, scattering a protective agent from the open riser, and carrying out rapid cooling on the surface of the high-chromium cast iron metal liquid to form a crust; the protective agent consists of a low-melting-point quenching agent and a calcium metasilicate heat insulating agent, wherein the low-melting-point quenching agent is firstly scattered, and then the calcium metasilicate heat insulating agent is scattered; pouring carbon steel molten metal, discharging the protective agent from a carbon steel overflow outlet, blocking the carbon steel overflow outlet by refractory mortar, and inserting a twisted steel bar from an open riser to damage a crust.
2. The twin liquid compound casting method according to claim 1, characterized in that: the low-melting-point quenching agent comprises a base material, a cosolvent and a quenching agent; the base material comprises lime and bauxite; the cosolvent comprises borax and cryolite; the quenching agent comprises tellurium powder and soda.
3. The twin liquid compound casting method according to claim 2, characterized in that: the low-melting-point quenching agent comprises the following materials in percentage by weight: 15-25% of lime, 15-25% of bauxite, 10-20% of borax, 15-25% of cryolite, 3-6% of tellurium powder and 15-25% of soda.
4. The twin liquid compound casting method according to claim 1, characterized in that: the weight of the calcium metasilicate heat preservation agent is 10-30% of that of the low melting point quenching agent.
5. The twin liquid compound casting method according to claim 1, characterized in that: the high-chromium cast iron overflow port and the carbon steel overflow port are combined into a whole, and the carbon steel overflow port is reserved.
6. The twin liquid compound casting method according to claim 1, characterized in that: and when the sand core is shielded under the open riser, a three-box molding is adopted.
7. The twin liquid compound casting method according to claim 1, characterized in that: the twisted steel is not taken out.
8. The twin liquid compound casting method according to claim 1, characterized in that: the carbon steel is replaced by low alloy steel.
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| CN115158997A (en) * | 2022-07-16 | 2022-10-11 | 西安强盛耐磨机械有限公司 | Double-metal liquid composite casting spiral auger and manufacturing method thereof |
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| CN115158997B (en) * | 2022-07-16 | 2023-09-12 | 西安强盛耐磨机械有限公司 | Double-metal liquid composite casting spiral auger and manufacturing method thereof |
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