Alloy cast iron glass mold and preparation method thereof

Abstract

The invention relates to the technical field of mold casting, in particular to an alloy cast iron glass mold and a preparation method thereof. The alloy cast iron glass mold comprises a mold base body and an alloy plating layer cladded on the surface of the mold base body; wherein the mold base body comprises the following chemical components: Ni, Cr, Mo, Sn, Zn and Fe; and the alloy plating layer comprises the following chemical components: Cr, Co, Mn and Cu. The problems that in the prior art, a heat-resisting alloy cast iron mold is low in surface hardness, air holes or cracks are likely to be generated, and therefore the service life of the mold is affected are effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of mold casting, and in particular to an alloy cast iron glass mold and a preparation method thereof. Background Art

[0002] At present, the metal materials used to make glass mold blanks mainly include heat-resistant alloy cast iron, heat-resistant stainless steel and heat-resistant copper alloy. Among them, heat-resistant stainless steel is mainly used in the production of glassware, glass lighting and other molds; copper alloy has been widely used in foreign glass mold production due to its good thermal conductivity, oxidation resistance, high temperature resistance, heat fatigue resistance and not easy to break. However, the manufacturing cost of copper alloy is equivalent to several times that of ordinary alloy cast iron, which is difficult to apply on a large scale. Therefore, heat-resistant alloy cast iron is still the main metal material for making glass mold blanks.

[0003] The existing heat-resistant alloy cast iron material has a low surface hardness. During use, it is easy to be damaged by the erosion of high-temperature molten glass and the collision between molds, causing the surface parts of the mold joint surface, die, mouth ring, punch, and core to be damaged. Severe cases will cause the mold to be scrapped early. In order to increase the surface hardness of the mold cavity and the joint joint and extend the service life, when producing heat-resistant alloy cast iron molds, it is necessary to spray-weld the joint surface of the initial mold, die, mouth ring, punch, and core with a very high hardness nickel alloy powder. However, the existing spray welding technology is difficult to achieve uniform spray welding thickness of each part, and pores or cracks will inevitably be generated during the spray welding process, affecting the service life of the mold.

[0004] Based on this, developing an alloy cast iron mold with high surface hardness and good corrosion resistance has important practical significance for the preparation of glass molds. Summary of the invention

[0005] In view of the problem that the surface hardness of the heat-resistant alloy cast iron mold in the prior art is low and pores or cracks are easily generated, thereby affecting the service life of the mold, the present invention provides an alloy cast iron glass mold and a preparation method thereof. By utilizing the combined effect of the mold base and the alloy coating, the alloy cast iron glass mold has good hardness and quality, avoiding the generation of pores, sand holes or cracks, thereby effectively extending the service life of the alloy cast iron glass mold.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: A first aspect of the present invention provides an alloy cast iron glass mold, the alloy cast iron glass mold comprising a mold base and an alloy coating clad on the surface of the mold base; Wherein, the mold matrix includes the following chemical components in percentage by mass: Ni: 1.85%-2.25%, Cr: 1.20%-1.75%, Mo: 1.35%-1.65%, Sn: 0.90%-1.40%, Zn: 1.20%-2.40%, and the balance is Fe and unavoidable impurities; The alloy coating includes the following chemical components in percentage by mass: Cr: 2.70%-3.20%, Co: 0.20%-0.30%, Mn: 1.15%-1.45%, and the remainder is Cu and unavoidable impurities.

[0007] Compared with the prior art, the present invention adds an alloy protective coating on the mold substrate, which not only enhances the corrosion resistance and surface hardness of the mold substrate, but also can avoid the occurrence of pores or cracks in the alloy cast iron mold. Among them, the Ni in the mold substrate can increase the strength, toughness and corrosion resistance of the mold substrate, and the nickel atoms can be integrated into the lattice of the matrix alloy to hinder the movement of dislocations, making the matrix alloy less likely to deform and break when subjected to external forces, thereby improving the bearing capacity of the matrix alloy. Cr can greatly improve the hardness and corrosion resistance of the mold substrate, but excessive chromium will cause the mold substrate to become more brittle. Therefore, the present invention adds a small amount of chromium element, which is dispersed in the mold substrate, thereby improving the hardness of the matrix alloy and avoiding the alloy material from becoming more brittle.

[0008] Mn can be integrated into the metal matrix and increase the bonding force between alloy atoms through the solid solution strengthening mechanism, thereby improving the hardness and strength of the alloy material. More importantly, Mn can combine with oxygen to form manganese oxide, which can reduce alloy defects caused by oxygen in alloy materials and reduce the generation of pores or cracks. Sn can enhance the strength and hardness of the alloy matrix, as well as the corrosion resistance, and Sn has a low melting point, which can improve the machinability of the alloy matrix. Zn can enhance the wear resistance and dimensional stability of the alloy and maintain the stable performance of the glass mold matrix. Using copper alloy as the alloy coating can not only make the mold matrix have good thermal conductivity and wear resistance, but also strengthen the surface hardness and corrosion resistance of the mold matrix. Among them, the presence of Co can make the copper alloy have better strength, hardness and wear resistance. In a high temperature environment, Co atoms can effectively prevent the grain growth of the copper alloy and improve the high temperature resistance of the copper alloy, thereby further improving the heat resistance and wear resistance of the alloy cast iron glass mold.

[0009] Preferably, the thickness of the alloy coating is 0.5 mm-3 mm.

[0010] The second aspect of the present invention provides a method for preparing the alloy cast iron glass mold, comprising the following steps: Step 1: weighing raw material components of the mold base according to the designed ratio and smelting them to obtain mixed molten iron; adding the inoculant and the mixed molten iron into a ladle in sequence for inoculation to obtain inoculated molten iron; Step 2: injecting the inoculated molten iron into a sand mold for casting, cooling, and obtaining a base blank; polishing and heat treating the base blank in sequence to obtain a mold base; Step 3: weigh the raw material components of the alloy coating according to the designed ratio and perform ball milling to obtain a mixed alloy powder, and clad the mixed alloy powder on the surface of the mold substrate by laser cladding to obtain an alloy cast iron glass mold precursor; Step 4: annealing the alloy cast iron glass mold precursor to obtain the alloy cast iron glass mold.

[0011] Compared with the prior art, the present invention adopts laser cladding to prepare the alloy coating on the mold substrate, which can more accurately control the thickness and shape of the alloy coating, and can effectively avoid defects such as small pores or microcracks that would be produced by the prior art spray welding technology. The laser cladding method can make the alloy coating more firmly bonded to the mold substrate, which is not easy to peel off during operation, thereby ensuring the stability of the alloy cast iron glass mold during use.

[0012] Preferably, in step one, the raw material components of the mold base include scrap steel, nickel-iron alloy, molybdenum-iron alloy, iron-tin alloy, iron-chromium alloy and iron-zinc alloy.

[0013] Preferably, in step one, the raw material components of the alloy plating layer include chromium powder, cobalt powder, manganese powder and copper powder.

[0014] Preferably, in step 1, the smelting temperature is 1200°C-1500°C.

[0015] Preferably, in step one, the inoculant is a silicon-strontium inoculant, and the amount of the inoculant added is 0.4wt%-0.6wt% of the mixed molten iron.

[0016] Preferably, in step 1, the incubation temperature is 1520°C-1540°C, and the incubation time is 5 min-10 min.

[0017] Preferably, in step 2, the casting temperature is 1380° C.-1410° C.; and the casting time is 40s-60s.

[0018] Preferably, in step 2, the polishing treatment is performed by sandblasting and polishing with glass beads of 150 mesh and Rockwell hardness of 48HRC-52HRC, and the polishing time is 50s-70s.

[0019] Preferably, in step 2, the heat treatment is a segmented annealing treatment; wherein the temperature of the first segment annealing treatment is 500°C-580°C, and the holding time of the first segment annealing treatment is 2h-3h; the temperature of the second segment annealing treatment is 680°C-720°C, and the holding time of the second segment annealing treatment is 1h-2h; the temperature of the third segment annealing treatment is 830°C-870°C, and the holding time of the third segment annealing treatment is 3h-4h.

[0020] Further preferably, in step 2, annealing is performed by programmed temperature rise, wherein the heating rate of the first annealing treatment is 4°C / min-6°C / min; the heating rate of the second annealing treatment is 1°C / min-3°C / min; and the heating rate of the third annealing treatment is 2°C / min-4°C / min.

[0021] Preferably, in step three, the rotation speed of the ball mill is 2000rpm-3000rpm, and the time of the ball mill is 2h-3h.

[0022] Preferably, in step three, the laser power of the laser cladding is 2500W-2800W, the laser scanning rate is 6mm / s-8mm / s, the spot diameter is 0.5mm-0.8mm, the powder feeding rate is 5g / min-15g / min, and the gas flow rate is 20L / min-22L / min.

[0023] Preferably, in step 4, the temperature of the annealing treatment is 700° C.-750° C., and the holding time of the annealing treatment is 1 h-2 h. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1 This embodiment provides an alloy cast iron glass mold and a preparation method thereof, which specifically includes the following contents: The alloy cast iron glass mold comprises a mold base and an alloy coating clad on the surface of the mold base; wherein the mold base comprises the following chemical components in percentage by mass: Ni: 2.08%, Cr: 1.63%, Mo: 1.45%, Sn: 1.12%, Zn: 1.87%, and the remainder is Fe and unavoidable impurities; The alloy coating includes the following chemical components in percentage by mass: Cr: 2.93%, Co: 0.26%, Mn: 1.33%, and the remainder is Cu and unavoidable impurities.

[0026] Step 1: weigh 1 t of scrap steel, nickel-iron alloy, molybdenum-iron alloy, iron-tin alloy, iron-chromium alloy and iron-zinc alloy according to the designed ratio, and smelt them at 1400° C. to obtain mixed molten iron; add 5 kg of silicon-strontium inoculant and the mixed molten iron into a ladle in sequence, and incubate at 1530° C. for 8 min to obtain inoculated molten iron; Step 2, cooling the inoculated molten iron to 1380°C, injecting it into a sand mold for casting, ensuring that the casting is completed within 50 seconds, cooling it naturally to room temperature after solidification, and taking it out after keeping it for 6 hours to obtain the matrix blank; using 150 mesh and 50HRC Rockwell hardness glass beads to sand and polish the matrix blank for 60 seconds, and then performing a stepwise annealing treatment on the polished matrix blank, first heating it to 550°C at a heating rate of 5°C / min, and keeping it warm for 2.5 hours; then heating it to 700°C at a heating rate of 2°C / min, and keeping it warm for 1.5 hours; finally heating it to 850°C at a heating rate of 3°C / min, and keeping it warm for 3.5 hours to obtain the mold matrix; Step three, weigh chromium powder, cobalt powder, manganese powder and copper powder according to the designed ratio, and ball mill them at a speed of 2500rpm for 2.5h to obtain a mixed alloy powder; use laser cladding to clad the mixed alloy powder on the surface of the mold substrate with a cladding thickness of 1.5mm to obtain an alloy cast iron glass mold precursor; wherein the laser power of the laser cladding is 2700W, the laser scanning rate is 7mm / s, the spot diameter is 0.6mm, the powder feeding rate is 10g / min, and the gas flow rate is 21L / min.

[0027] Step 4: annealing the alloy cast iron glass mold precursor at 720° C. for 1.5 hours to obtain the alloy cast iron glass mold.

[0028] Example 2 This embodiment provides an alloy cast iron glass mold and a preparation method thereof, which specifically includes the following contents: The alloy cast iron glass mold comprises a mold base and an alloy coating clad on the surface of the mold base; wherein the mold base comprises the following chemical components in percentage by mass: Ni: 2.23%, Cr: 1.27%, Mo: 1.61%, Sn: 1.02%, Zn: 1.34%, and the remainder is Fe and unavoidable impurities; The alloy coating includes the following chemical components in percentage by mass: Cr: 2.72%, Co: 0.22%, Mn: 1.41%, and the remainder is Cu and unavoidable impurities.

[0029] Step 1: weigh 1 t of scrap steel, nickel-iron alloy, molybdenum-iron alloy, iron-tin alloy, iron-chromium alloy and iron-zinc alloy according to the designed ratio, and smelt them at 1355° C. to obtain mixed molten iron; add 5.5 kg of silicon-strontium inoculant and the mixed molten iron into a ladle in sequence, and incubate at 1535° C. for 8 min to obtain inoculated molten iron; Step 2, cooling the inoculated molten iron to 1395°C, injecting it into a sand mold for casting, ensuring that the casting is completed within 60s, cooling it naturally to room temperature after solidification, and taking it out after keeping it for 6h to obtain the matrix blank; using 150 mesh and 48HRC Rockwell hardness glass beads to sand and polish the matrix blank for 70s, and then performing a stepwise annealing treatment on the polished matrix blank, first heating it to 580°C at a heating rate of 5°C / min, and keeping it warm for 2h; then heating it to 720°C at a heating rate of 2°C / min, and keeping it warm for 1h; finally heating it to 840°C at a heating rate of 3°C / min, and keeping it warm for 3.5h to obtain the mold matrix; Step three, weigh chromium powder, cobalt powder, manganese powder and copper powder according to the designed ratio, and ball mill them at a speed of 3000rpm for 2h to obtain a mixed alloy powder; use laser cladding to clad the mixed alloy powder on the surface of the mold substrate with a cladding thickness of 2.2mm to obtain an alloy cast iron glass mold precursor; wherein the laser power of the laser cladding is 2700W, the laser scanning rate is 7mm / s, the spot diameter is 0.6mm, the powder feeding rate is 10g / min, and the gas flow rate is 22L / min.

[0030] Step 4: annealing the alloy cast iron glass mold precursor at 720° C. for 1.5 hours to obtain the alloy cast iron glass mold.

[0031] Example 3 This embodiment provides an alloy cast iron glass mold and a preparation method thereof, which specifically includes the following contents: The alloy cast iron glass mold comprises a mold base and an alloy coating clad on the surface of the mold base; wherein the mold base comprises the following chemical components in percentage by mass: Ni: 1.92%, Cr: 1.43%, Mo: 1.61%, Sn: 1.36%, Zn: 1.27%, and the remainder is Fe and unavoidable impurities; The alloy coating includes the following chemical components in percentage by mass: Cr: 2.73%, Co: 0.22%, Mn: 1.19%, and the remainder is Cu and unavoidable impurities.

[0032] Step 1: weigh 1 t of scrap steel, nickel-iron alloy, molybdenum-iron alloy, iron-tin alloy, iron-chromium alloy and iron-zinc alloy according to the designed ratio, and smelt them at 1380° C. to obtain mixed molten iron; add 4.5 kg of silicon-strontium inoculant and the mixed molten iron into a ladle in sequence, and incubate at 1535° C. for 10 min to obtain inoculated molten iron; Step 2, cooling the inoculated molten iron to 1390°C, injecting it into a sand mold for casting, ensuring that the casting is completed within 50 seconds, cooling it naturally to room temperature after solidification, and taking it out after keeping it for 6 hours to obtain the matrix blank; using 150 mesh and 52HRC Rockwell hardness glass beads to sand and polish the matrix blank for 60 seconds, and then performing a stepwise annealing treatment on the polished matrix blank, first heating it to 520°C at a heating rate of 5°C / min, and keeping it warm for 3 hours; then heating it to 680°C at a heating rate of 2°C / min, and keeping it warm for 2 hours; finally heating it to 860°C at a heating rate of 4°C / min, and keeping it warm for 4 hours to obtain the mold matrix; Step three, weigh chromium powder, cobalt powder, manganese powder and copper powder according to the designed ratio, and ball mill them at a speed of 2800rpm for 2.5h to obtain a mixed alloy powder; use laser cladding to clad the mixed alloy powder on the surface of the mold substrate with a cladding thickness of 0.9mm to obtain an alloy cast iron glass mold precursor; wherein the laser power of the laser cladding is 2600W, the laser scanning rate is 8mm / s, the spot diameter is 0.5mm, the powder feeding rate is 8g / min, and the gas flow rate is 20L / min.

[0033] Step 4: annealing the alloy cast iron glass mold precursor at 750° C. for 1 hour to obtain the alloy cast iron glass mold.

[0034] Comparative Example 1 This comparative example provides an alloy cast iron glass mold and a preparation method thereof, which is different from Example 1 in that the alloy coating is a nickel-copper alloy, and specifically includes the following contents: The alloy cast iron glass mold includes a mold base and an alloy coating clad on the surface of the mold base; wherein the mold base includes the following chemical components in percentage by mass: Ni: 2.08%, Cr: 1.63%, Mo: 1.45%, Sn: 1.12%, Zn: 1.87%, and the remainder is Fe and unavoidable impurities.

[0035] Step 1: weigh 1 t of scrap steel, nickel-iron alloy, molybdenum-iron alloy, iron-tin alloy, iron-chromium alloy and iron-zinc alloy according to the designed ratio, and smelt them at 1400° C. to obtain mixed molten iron; add 5 kg of silicon-strontium inoculant and the mixed molten iron into a ladle in sequence, and incubate at 1530° C. for 8 min to obtain inoculated molten iron; Step 2, cooling the inoculated molten iron to 1380°C, injecting it into a sand mold for casting, ensuring that the casting is completed within 50 seconds, cooling it naturally to room temperature after solidification, and taking it out after keeping it for 6 hours to obtain the matrix blank; using 150 mesh and 50HRC Rockwell hardness glass beads to sand and polish the matrix blank for 60 seconds, and then performing a stepwise annealing treatment on the polished matrix blank, first heating it to 550°C at a heating rate of 5°C / min, and keeping it warm for 2.5 hours; then heating it to 700°C at a heating rate of 2°C / min, and keeping it warm for 1.5 hours; finally heating it to 850°C at a heating rate of 3°C / min, and keeping it warm for 3.5 hours to obtain the mold matrix; Step three, weigh a nickel-copper alloy according to the designed ratio and ball-mill it at a speed of 2500rpm for 2.5h to obtain a mixed alloy powder; use laser cladding to clad the mixed alloy powder on the surface of the mold substrate with a cladding thickness of 1.5mm to obtain an alloy cast iron glass mold precursor; wherein the laser power of the laser cladding is 2700W, the laser scanning rate is 7mm / s, the spot diameter is 0.6mm, the powder feeding rate is 10g / min, and the gas flow rate is 21L / min.

[0036] Step 4: annealing the alloy cast iron glass mold precursor at 720° C. for 1.5 hours to obtain the alloy cast iron glass mold.

[0037] Comparative Example 2 This comparative example provides an alloy cast iron glass mold and a preparation method thereof, which is different from Example 1 in that the alloy cast iron glass mold has no alloy coating, and specifically includes the following contents: The alloy cast iron glass mold includes the following chemical components in percentage by mass: Ni: 2.08%, Cr: 1.63%, Mo: 1.45%, Sn: 1.12%, Zn: 1.87%, and the remainder is Fe and unavoidable impurities.

[0038] Step 1: weigh 1 t of scrap steel, nickel-iron alloy, molybdenum-iron alloy, iron-tin alloy, iron-chromium alloy and iron-zinc alloy according to the designed ratio, and smelt them at 1400° C. to obtain mixed molten iron; add 5 kg of silicon-strontium inoculant and the mixed molten iron into a ladle in sequence, and incubate at 1530° C. for 8 min to obtain inoculated molten iron; Step 2, cooling the inoculated molten iron to 1380°C, injecting it into a sand mold for casting, ensuring that the casting is completed within 50 seconds, cooling it naturally to room temperature after solidification, and taking it out after keeping it for 6 hours to obtain the matrix blank; using 150 mesh and 50HRC Rockwell hardness glass beads to sand and polish the matrix blank for 60 seconds, and then performing a stepwise annealing treatment on the polished matrix blank, first heating it to 550°C at a heating rate of 5°C / min, and keeping it warm for 2.5 hours; then heating it to 700°C at a heating rate of 2°C / min, and keeping it warm for 1.5 hours; finally heating it to 850°C at a heating rate of 3°C / min, and keeping it warm for 3.5 hours to obtain the mold matrix; Step three, weigh chromium powder, cobalt powder, manganese powder and copper powder according to the designed ratio, and ball mill them at a speed of 2500rpm for 2.5h to obtain a mixed alloy powder; use laser cladding to clad the mixed alloy powder on the surface of the mold substrate with a cladding thickness of 1.5mm to obtain an alloy cast iron glass mold precursor; wherein the laser power of the laser cladding is 2700W, the laser scanning rate is 7mm / s, the spot diameter is 0.6mm, the powder feeding rate is 10g / min, and the gas flow rate is 21L / min.

[0039] Step 4: annealing the alloy cast iron glass mold precursor at 720° C. for 1.5 hours to obtain the alloy cast iron glass mold.

[0040] In order to further reflect the technical effect of the present invention, the present invention carried out relevant performance tests on the alloy cast iron glass molds obtained in Examples 1-3 and Comparative Examples 1-2, specifically including the following contents: Referring to the enterprise standard Q / AD10304-2019, each alloy cast iron glass mold was subjected to Brinell hardness test, surface roughness test, casting defect test and service life test, and the specific test results are shown in Table 1.

[0041] Table 1 Performance test results of various alloy cast iron glass molds

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An alloy cast iron glass mold, characterized in that: The alloy cast iron glass mold comprises a mold base and an alloy coating clad on the surface of the mold base; Wherein, the mold matrix includes the following chemical components in percentage by mass: Ni: 1.85%-2.25%, Cr: 1.20%-1.75%, Mo: 1.35%-1.65%, Sn: 0.90%-1.40%, Zn: 1.20%-2.40%, and the balance is Fe and unavoidable impurities; The alloy coating includes the following chemical components in percentage by mass: Cr: 2.70%-3.20%, Co: 0.20%-0.30%, Mn: 1.15%-1.45%, and the remainder is Cu and unavoidable impurities.

2. The alloy cast iron glass mold according to claim 1, characterized in that: The thickness of the alloy coating is 0.5 mm to 3 mm.

3. The method for preparing the alloy cast iron glass mold according to claim 1 or 2, characterized in that: The steps include: Step 1: weighing raw material components of the mold base according to the designed ratio and smelting them to obtain mixed molten iron; adding the inoculant and the mixed molten iron into a ladle in sequence for inoculation to obtain inoculated molten iron; Step 2: injecting the inoculated molten iron into a sand mold for casting, cooling, and obtaining a base blank; polishing and heat treating the base blank in sequence to obtain a mold base; Step 3: weigh the raw material components of the alloy coating according to the designed ratio and perform ball milling to obtain a mixed alloy powder, and clad the mixed alloy powder on the surface of the mold substrate by laser cladding to obtain an alloy cast iron glass mold precursor; Step 4: annealing the alloy cast iron glass mold precursor to obtain the alloy cast iron glass mold.

4. The method for preparing the alloy cast iron glass mold according to claim 3, characterized in that: In step 1, the smelting temperature is 1200°C-1500°C; and / or In step 1, the inoculant is a silicon strontium inoculant, and the amount of the inoculant added is 0.4wt%-0.6wt% of the mixed molten iron; and / or In step 1, the incubation temperature is 1520°C-1540°C, and the incubation time is 5min-10min.

5. The method for preparing the alloy cast iron glass mold according to claim 3, characterized in that: In step 2, the casting temperature is 1380°C-1410°C; the casting time is 40s-60s; and / or In step 2, the polishing process is performed by sandblasting and polishing with glass beads of 150 mesh and Rockwell hardness of 48HRC-52HRC, and the polishing time is 50s-70s.

6. The method for preparing the alloy cast iron glass mold according to claim 3, characterized in that: In step 2, the heat treatment is a segmented annealing treatment; wherein, the temperature of the first segment annealing treatment is 500°C-580°C, and the holding time of the first segment annealing treatment is 2h-3h; the temperature of the second segment annealing treatment is 680°C-720°C, and the holding time of the second segment annealing treatment is 1h-2h; the temperature of the third segment annealing treatment is 830°C-870°C, and the holding time of the third segment annealing treatment is 3h-4h.

7. The method for preparing the alloy cast iron glass mold according to claim 6, characterized in that: In step 2, annealing is performed by programmed heating, wherein the heating rate of the first annealing treatment is 4°C / min-6°C / min; the heating rate of the second annealing treatment is 1°C / min-3°C / min; and the heating rate of the third annealing treatment is 2°C / min-4°C / min.

8. The method for preparing the alloy cast iron glass mold according to claim 3, characterized in that: In step 3, the rotation speed of the ball mill is 2000rpm-3000rpm, and the time of the ball mill is 2h-3h; and / or In step three, the laser power of the laser cladding is 2500W-2800W, the laser scanning rate is 6mm / s-8mm / s, the spot diameter is 0.5mm-0.8mm, the powder feeding rate is 5g / min-15g / min, and the gas flow rate is 20L / min-22L / min.

9. The method for preparing the alloy cast iron glass mold according to claim 3, characterized in that: In step 4, the temperature of the annealing treatment is 700°C-750°C, and the holding time of the annealing treatment is 1h-2h.

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