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Casting method of flat ingot for electrolytic condenser

A technology for electrolytic capacitors and flat ingots is applied in the field of aluminum product casting, which can solve the problems of increased ingot grain coarsening tendency, formation of slag inclusions, impurity cannot be separated in time, etc., and achieves the effect of uniform structure and no defects in appearance.

Inactive Publication Date: 2020-03-27
XINJIANG JOINWORLD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The casting temperature is closely related to the quality of the slab: when the casting temperature is increased and other conditions remain unchanged, the ingot grain coarsening tendency increases, the liquid cavity becomes deeper, the columnar crystal formation tendency increases, the hot brittleness of the alloy increases, and the crack tendency becomes larger ; On the contrary, it will cause impurities in the molten aluminum to be unable to be separated in time, forming defects such as slag inclusions

Method used

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  • Casting method of flat ingot for electrolytic condenser
  • Casting method of flat ingot for electrolytic condenser
  • Casting method of flat ingot for electrolytic condenser

Examples

Experimental program
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Effect test

Embodiment 1

[0030] During the casting process, the casting temperature is controlled at 700°C-710°C, and then the casting speed and cooling water flow are adjusted. When the casting speed is controlled at 47mm / min, with the cooling water flow from 128m 3 / h began to increase, during which the water flow was 128m 3 / h, aluminum leakage occurs during startup, such as figure 1 shown. Then, the water flow is controlled at 151m 3 / h, the thermal tumor of the ingot is reduced to less than 3mm, such as figure 2 As shown in ①, it meets the standard of thermal tumor thickness ≤ 3mm. Cooling water flow at 151m 3 / h-192m 3 / h, thermal bumps and cold barriers meet the standard of ≤3mm, and the grain size meets the standard of 3-7 per square decimeter, such as figure 2 As shown in ②, when the cooling water flow is greater than 192m 3 / h, the cold barrier exceeds the requirement of ≤3mm, such as figure 2 As shown in ③.

[0031] Therefore, a set of parameter ranges is obtained: casting tempe...

Embodiment 2

[0033] During the casting process, control the casting temperature at 700°C-710°C, then adjust the casting speed and cooling water flow, when the cooling water flow is controlled at 180m 3 / h, as the casting speed increases from 38mm / min, faults appear on the surface of the slab, such as image 3 shown. Then, cold barrier defects start to appear see Figure 4 , as the speed increases, the cold gap decreases, and the change trend is shown in Figure 5 As shown in ①, when the casting speed is controlled at 41mm / min-50mm / min, the surface defects of the slab, heat bumps, and cold snaps meet the standard of ≤3mm, and the grain size meets the standard of 3-7 per square decimeter. See Figure 5 As shown in ②, when the casting speed is greater than 50mm / min, the thermal tumor will increase significantly, such as Figure 5 As shown in ③.

[0034] Therefore, a set of parameter ranges is obtained: casting temperature 700°C-710°C; casting speed 41mm / min-50mm / min; cooling water flow 1...

Embodiment 3

[0036] During the casting process, the casting speed is 47mm / min, and the cooling water flow rate is 180m 3 / h control, and then adjust the casting temperature from 679°C, some casting failures and large-area thermal tumors occur due to low temperature, see Figure 6 and Figure 7 . After the casting temperature is from 679℃, the size of the thermal nodules shows a downward trend, see Figure 8 As shown in ①. When the casting temperature is controlled at 685-730°C, the surface defects of the slab, heat bumps, and cold snaps meet the standard of ≤3mm, and the grain size meets the standard of 3-7 per square decimeter, see Figure 8 As shown in ②. When the casting temperature is higher than 730°C, the metal nodules and grains become significantly larger, see Figure 8 As shown in ③.

[0037] Therefore, a set of parameter ranges is obtained: casting temperature 685°C-730°C; casting speed 47mm / min; cooling water flow 180m 3 / h.

[0038] Select process parameters according t...

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Abstract

The invention discloses a casting method of a flat ingot for an electrolytic condenser, relates to the technical field of aluminum product casting, and mainly aims to improve the yield of the flat ingot. According to the technical scheme, the casting method of the flat ingot for the electrolytic condenser comprises the following steps of (1), a pre-casting process, and specifically obtaining a pre-casting material through sequentially carrying out proportioning, refining and grain refining; and (2) a casting process, wherein the cooling water flow is 156 m<3> / h-192 m<3> / h, the casting temperature was 685 DEG C-720 DEG C, and the casting speed was 44 mm / min-50 mm / min.

Description

technical field [0001] The invention belongs to the technical field of casting of aluminum products, and in particular relates to a casting method of flat ingots for electrolytic capacitors. Background technique [0002] In the production process of aluminum slabs for electrolytic capacitors, defects such as coarse grains and poor internal structure often occur. After research, it is found that in continuous and semi-continuous casting, the main factors affecting the quality of ingots are cooling rate, casting speed, casting temperature and so on. [0003] In the casting process, when the cooling intensity increases, the crystallization speed of the ingot will increase, the solute elements in the melt will not have time to diffuse, the degree of supercooling will increase, and the number of crystal nuclei will increase, so the obtained grains will be finer, and the size of the transition zone will be reduced at the same time, and the ingot will be denser. Improved, reduced ...

Claims

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Application Information

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IPC IPC(8): B22D7/06C22C1/03C22C1/06C22C21/00
CPCB22D7/005B22D7/064C22C1/026C22C1/03C22C1/06C22C21/00
Inventor 左宏樊兵覃超陈建军王多洋李新毓何真疆
Owner XINJIANG JOINWORLD CO LTD
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