Water-cooling die casting production process of plate blank used for medium plate

A technology of water-cooled mold casting and production process, which is applied in the direction of manufacturing tools, casting equipment, metal processing equipment, etc. It can solve the problems of low production efficiency, shrinkage cavity, high mold consumption, etc., and achieve the effect of ensuring quality and reducing secondary oxidation

Inactive Publication Date: 2010-08-04
NANJING IRON & STEEL CO LTD
2 Cites 9 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0003] The first is the traditional die-casting slab. This ingot casting method can produce high-quality slabs, but the mold consumption is high, and defects such as segregation and shrinkage are prone to occur; The subsequent furnace loading and rolling will lead to low production efficiency; at the same time, due to the low utilization rate of the cap opening and the high cost of casting ingots, the working conditions of the workers are poor
[0004] The second is continuous casting machine slab, which is more commonly used at present. The continuous casting machine has many s...
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Method used

A kind of water-cooled die-casting production technique of high requirement die steel P80 medium-thick plate slab, this production technique adopts argon protection pouring to realize in the pouring process that molten steel flows out from the nozzle and is isolated from the air contact; use solid mold slag to protect the pouring to ensure the surface quality of the slab; adjust the rising hole of the convection steel to make the molten steel rise steadily in the water-cooled die casting, and ensure the surface quality of the slab; the details are as follows:
Adopt solid protective slag to protect pouring, can avoid surface defects such as turning skin hemp pit, simultaneously in pouring process, to the inclusion in molten steel, certain adsorption is arranged, and key is to add on timing and will control well, prevents unfinished liquid slag When it is involved in the steel, it will form surface powder slag scarring and near-surface slag inclusion defects. Add part of the mold slag just after the injection flow flattens the mold bottom, and gradually add it later, so as to ensure the surface quality and reduce the occurrence of slag entrainment defects.
The rising hole of convective steel is adjusted, and in fact water-cooled die-casting rises inconsistency in pouring early stage, rises faster near the mid-cast tube side, stirs more sever...
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Abstract

The invention discloses a water-cooling die casting production process of a plate blank used for a medium plate, which is characterized in that the production process adopts the protective pouring of argon gas in the overall process of the pouring so as to realize that the contact of molten steel with the air is isolated in the pouring process after the molten steel flows out from a water gap; the protective pouring of solid covering slag is adopted to ensure the surface quality of a casting blank; and an ascending hole of flow steel is regulated to enable the molten steel to stably ascend in water-cooling die casting, and the surface quality of the casting blank is ensured. The invention avoids the defects of skull patch, pits and the like of the surface and the defect of slag entrapment when the water-cooling die casting is adopted to produce the blank of the medium plate, and the adopted protective pouring reduces the secondary oxidation of the molten steel in the pouring process, has a certain adsorption function to inclusion and ensure the quality of the blank of the medium plate. The invention is suitable for the production process of the blank of a high-alloy steel medium plate of die steel with high requirement.

Application Domain

Technology Topic

SlagWater gap +6

Image

  • Water-cooling die casting production process of plate blank used for medium plate
  • Water-cooling die casting production process of plate blank used for medium plate

Examples

  • Experimental program(1)

Example Embodiment

[0017] The present invention will be further described below in conjunction with the examples.
[0018] A water-cooled die-casting production process for high-demand die steel P80 medium-thick plate slabs, the production process adopts argon protection pouring in the whole pouring process to isolate the contact with the air after the molten steel flows out from the nozzle during the pouring process; The solid mold slag is used to protect the casting to ensure the surface quality of the slab; the rising hole of the convection steel is adjusted to make the molten steel rise smoothly in the water-cooled die casting to ensure the surface quality of the slab; the details are as follows:
[0019] In the whole pouring process, argon gas protection is used for pouring, figure 1 It is a schematic diagram of the argon protection casting adopted in the present invention. The pouring device consists of an argon gas group 1, an argon gas pipeline 2, a double argon blowing ring 3 and a sealing cover 4. The sealing cover 4 is arranged between the ladle water outlet 5 and the middle casting pipe 6 , the argon blowing double ring 3 is arranged between the sealing cover 4 and the ladle water outlet 5 ; the argon gas group 1 is connected with the argon gas pipeline 2 . Blow argon to the whole pouring system before pouring. The air in the pouring system can be eliminated by using the characteristic that the specific gravity of argon is greater than that of air, so as to reduce or even isolate the contact with the air after the molten steel flows out of the nozzle during the pouring process.
[0020] The use of solid mold slag to protect the pouring can avoid surface defects such as turning skin and pits, and at the same time, it has a certain adsorption effect on the inclusions in the molten steel during the pouring process. Surface slag scarring and near-surface slag inclusion defects are formed in steel. Part of the mold slag is added just after the injection flow is flattened to the bottom of the mold, and it is gradually added in the later stage, which can ensure the surface quality and reduce the occurrence of slag defects.
[0021] Adjust the rising hole of convection steel. In fact, the rise of water-cooled die casting is inconsistent in the early stage of pouring. The side close to the middle casting pipe rises faster and turns more violently, and it is easier to produce slag defects on the side near the middle casting pipe. Therefore, the rising hole of convection steel is The diameter of the rising hole on the side close to the middle casting pipe is adjusted to be smaller, and the diameter of the rising hole on the side far from the middle casting pipe is relatively larger, so that the rise of the molten steel in the water-cooled die casting will be stable and further reduce the volume Possibility of slag defects. The originally used water-cooled die casting ascending holes had 7 holes evenly distributed with a diameter of φ40mm. In the present invention, the diameters of the two ascending holes on the near-middle casting pipe side were changed to φ20mm, and the diameters of the remaining ascending holes on the far-center casting pipe side were changed to 30mm, a total of 10. It is found that the molten steel rises smoothly during the pouring process. Double-circle double argon protection is used for pouring, and argon is blown to the entire pouring system before pouring, and argon protection is also used throughout the pouring process. After pouring, the molten steel just fills the bottom of the solid mold, and the mold slag is sprinkled into the part. During the pouring process, the mold slag is added according to the consumption of the mold slag until the pouring process ends.
[0022] The produced billet is ultrasonically tested to JB/T4730.3-2005 standard grade I after rolling the medium plate, the inclusion grade is low, the grain size reaches grade 11, and the comprehensive performance is good.
[0023]
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