Combined type water-cooled casting mould integrating directional casting blank solidification and selective area cooling

A technology of directional solidification and water-cooled casting molds, which is applied in the field of metallurgical casting. It can solve the problems that the internal quality of the billet cannot be completely improved, and the casting mold cannot be designed for the round billet. Ratio, the effect of grain uniformity

Active Publication Date: 2016-12-07
YANTAI WANLONG VACUUM METALLURGY
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AI-Extracted Technical Summary

Problems solved by technology

However, increasing the cooling intensity alone can only increase the cooling intensity, and the directional solidification may be terminated, which cannot completely improve the internal quality of the slab
Chinese Patent Publication No. CN102161079 A discloses a combined casting mold with water-cooled chassis and surrounding water-cooled movable molds, and adopts large reduction technology to eliminate air gaps, and effectively improves and eliminates shrinkage porosity, segregation and shrinkage cavities in the cent...
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Abstract

The invention relates to a combined type water-cooled casting mould integrating directional casting blank solidification and selective area cooling. By the adoption of the combined type water-cooled casting mould, from-bottom-to-top forced cooling and directional solidification of a casting blank are achieved, the situation that columnar crystals grow in the direction perpendicular to the wall of the mould and the situation that because the columnar crystals which grow in a non-directional manner are overdeveloped, the columnar crystals grow in the direction perpendicular to a base plate are avoided, the problems of central shrinkage porosity and V-shaped segregation are eliminated, a large-piece-weight cast-forged blank with grain being refined, grain size being uniform in ultrasonic testing and a solidification structure being compact, uniform and free of lacks is obtained, and the ultrasonic flow detection yield is improved; the upper half portion of a casting mould body is of a hollow heat-preservation structure; a cooling water channel and a base plate water cooler on the lower half portion of the casting mould body can conduct segmented selective cooling on different areas of the casting mould; establishment of a one-dimensional temperature field and the achievement of high cooling intensity are both considered; most of sensible heat and most of latent heat of the cast blank are conducted from the base plate, and therefore directional solidification is achieved; and a hot feeding riser is adopted, a molten glass layer, a heat generating agent layer and a covering layer which are arranged in the hot feeding riser enable a shrinkage cavity area to be mainly concentrated on the hot feeding riser, the solid height in the hot feeding riser is increased, and the ratios of a top crop and a back-end crop of the cast blank are reduced.

Application Domain

Technology Topic

Directional solidificationWater cooler +11

Image

  • Combined type water-cooled casting mould integrating directional casting blank solidification and selective area cooling
  • Combined type water-cooled casting mould integrating directional casting blank solidification and selective area cooling
  • Combined type water-cooled casting mould integrating directional casting blank solidification and selective area cooling

Examples

  • Experimental program(2)

Example Embodiment

[0045] Example 1
[0046] Place the combined water-cooled casting mold on the lifting platform of the vacuum casting chamber, evacuate the vacuum to below 10 Pa, heat the electrolytic copper to 1200°C with a graphite crucible, add pure silver and sponge zirconium after the metal in the crucible is melted, and the melting temperature continues to rise to 1300-1350℃, adjust the composition to obtain NARloy-Z alloy (Cu-3%Ag-0.5%Zr) liquid, cool down and stand still to 1150-1200℃ for vacuum casting, slowly lower the lifting platform as the liquid level rises to ensure immersion The nozzle is always below the liquid level to prevent alloy liquid from splashing to the inner mold wall. At the end of casting, add the prepared molten glass through the hopper, then add the prepared heating agent, and finally add the covering agent.
[0047] Open the water inlet 5-10 minutes before the start of the upper pouring, so that the upper and lower bottom plates are lowered to a lower temperature. The alloy liquid is poured into the mold body through the immersion nozzle, and the internal cooling water channel of the upper chassis is blocked by the baffle plate, and the cooling water is increased to about 12m/s. The temperature of the mold wall between the first side wall water channel and the second side wall water channel is measured by an infrared thermometer, the first side wall water channel is opened according to the temperature curve, and the design water speed is about 10-12m/s. According to infrared temperature measurement, the second side wall water channel and the third side wall water channel are gradually opened to increase the cooling strength of the upper part of the casting slab and the refractory alloy liquid, so that most of the heat is conducted through the upper chassis, and a directional solidification temperature field is established.
[0048] The high-magnification structure of the NARloy-Z ingot after solid solution-aging strengthening shows that there is basically no secondary shrinkage cavity. The low-magnification structure shows that the columnar crystals have obvious directions, and there is no obvious shrinkage porosity in the center of the ingot, and the solidified structure is dense and uniform. Compared Figure 4 Natural cooling ingots in Figure 5 In this embodiment, the grain refinement is more uniform, and the ultrasonic flaw detector probe used is 2.5P20, the frequency is 2.5MHz, the sound intensity is 46dB, and the signal-to-noise ratio is 10-20%. The shrinkage holes are concentrated on the upper part of the heat-feeding riser, and the heat-feeding is good. The solid height of the heat-feeding riser is 60-70mm, and the maximum height is 80mm. After heat treatment, NARloy-Z alloy ingots show excellent high temperature tensile properties, high temperature and high cycle fatigue resistance and creep resistance.

Example Embodiment

[0049] Example 2
[0050] Place the combined water-cooled casting mold on the lifting platform of the vacuum casting chamber, evacuate the vacuum to below 10Pa, use a graphite crucible to heat the electrolytic copper to 1200℃, add pure silver and sponge zirconium after the metal in the crucible is melted, and the melting temperature will continue to rise To 1300-1350℃, adjust the composition to obtain Cu-Cr-Zr alloy (Cu-0.65%Cr-0.1%Zr) liquid, cool down and stand still to 1220-1250℃ for vacuum casting, slowly lower the lifting platform as the liquid level rises , To ensure that the immersion nozzle is always below the liquid level to prevent alloy liquid from splashing on the inner mold wall. At the end of casting, add the prepared molten glass through the hopper, then add the prepared heating agent, and finally add the covering agent.
[0051] Open the water inlet 5-10 minutes before the start of the upper pouring, so that the upper and lower bottom plates are lowered to a lower temperature. The alloy liquid is poured into the mold body through the immersion nozzle, and the internal cooling water channel of the upper chassis is blocked by the baffle plate, increasing the cooling water to about 12m/s. Measure the mold wall temperature between the first side wall water channel and the second side wall water channel by infrared thermometer, open the first side wall water channel according to the temperature curve, design the water speed of about 10-12m/s, and gradually open it according to the infrared temperature measurement The second side wall water channel 32 and the first side wall water channel 33 increase the cooling strength of the upper part of the casting slab and the refractory alloy liquid, so that most of the heat is conducted through the upper chassis, and a directional solidification temperature field is established.
[0052] Such as Figure 7 As shown, the results of ultrasonic testing show that the uniformity of crystal grains is compared with the natural cooling ingot ( Image 6 ) More detailed and uniform. The surface and internal quality of the ingot obtained by this embodiment have been greatly improved, mainly in: 1. The thickness of the fine crystal region on the surface of the ingot is increased, the grain size is reduced, and the directionality of columnar crystal growth is enhanced. There is no obvious shrinkage porosity in the center of the billet, and the solidification structure is dense and uniform. The ultrasonic flaw detector probe used is 2.5P20, frequency 2.5MHz, sound intensity 46dB, signal-to-noise ratio 10-20%; 2. Cu-Cr-Zr alloy resists The tensile strength is increased by 10-30MPa, the elongation after fracture is increased by 10-20%, and the hardness and impact toughness are also greatly improved; 3. The proportion of the riser part is reduced, and the cutting head and tail cutting rate of the casting is reduced. And the implementation of this technology plays a key role in extending mold life and improving production efficiency.
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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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