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Casting method for large-size 1.2382 cast steel die insert

A technology of large size and inserts, which is applied in the direction of casting molding equipment, manufacturing tools, furnace types, etc., and can solve problems such as difficulties in mold manufacturing

Active Publication Date: 2017-07-07
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, when we used 1.2382, there were more cracks in heat treatment. Among them, the 1.2382 mold inserts of small pieces had less cracks, and the larger mold inserts (inserts with a height or width greater than 80mm or 100mm) were almost all cracked. Inserts of this size are commonly used in mold manufacturing, and the heat treatment cracking of 1.2382 cast steel brings great difficulties to mold manufacturing

Method used

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  • Casting method for large-size 1.2382 cast steel die insert
  • Casting method for large-size 1.2382 cast steel die insert
  • Casting method for large-size 1.2382 cast steel die insert

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Water glass sand model casting process hollows out inserts (shape such as Figure 4 )

[0024] The size of the mold steel insert is within 100mm (width) × 80mm (height) × length <600mm (length) × 400mm (width) × 150mm (average height), the center is hollowed out, the wall thickness is 50mm, and the surface thickness is 60mm. Shell mold inserts.

[0025] 1) The pouring temperature of the molten steel is 1600°C. After the pouring of the molten steel is completed, the mold (sand box) is removed when the cast steel drops from the pouring temperature to 960°C;

[0026] 2) The casting after demoulding needs to be cooled to 500°C in the air, put the steel casting into the pit, and cool to room temperature;

[0027] 3) After removing the riser of the casting, immediately send the casting into the annealing furnace, and perform annealing treatment at an annealing temperature of 850°C for 2 hours; keep it at 720°C for 7 to 8 hours;

[0028] 4) Transfer to a vacuum air quenchin...

Embodiment 2

[0030] The shape of water glass sand casting process is approximately hollowed out (shape such as Figure 5 )

[0031] 1) The pouring temperature of the molten steel is 1600°C. After the pouring of the molten steel is completed, the mold (sand box) is removed when the cast steel drops from the pouring temperature to 960°C;

[0032] 2) The casting after demoulding needs to be cooled to 500°C in the air, put the steel casting into the pit, and cool to room temperature;

[0033] 3) After removing the riser of the casting, immediately send the casting into the annealing furnace, and perform annealing treatment at an annealing temperature of 850°C for 2 hours; keep it at 720°C for 7 to 8 hours;

[0034] 4) Transfer to a vacuum air quenching furnace, quench and heat at 1020°C, and use the gas quenching method to quench; temper once at 510°C, and temper again at 515°C.

[0035] The obtained casting has a hardness of HRC58-62.

Embodiment 3

[0037] Trimming molds (shape such as Figure 6 ), due to its shape characteristics, the cooling speed is fast, it does not need to be hollowed out, and it can be cast directly.

[0038] 1) The pouring temperature of the molten steel is 1600°C. After the pouring of the molten steel is completed, the cast steel is removed from the mold (sand box) when the pouring temperature drops to 958°C;

[0039] 2) The casting after demoulding needs to be cooled to room temperature in the air;

[0040] 3) Immediately send the casting into the annealing furnace after removing the riser of the casting, and perform annealing treatment at an annealing temperature of 850°C for 2 hours; hold at 720°C for 5 to 6 hours;

[0041] 4) Transfer to a vacuum air quenching furnace, quench and heat at 1000°C, and use the gas quenching method to quench; temper at 200°C for 2 to 3 times.

[0042] The obtained casting has a hardness of HRC58-62.

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Abstract

The invention discloses a heat treatment casting method for a large-size 1.2382 cast steel die insert, and belongs to the technical field of die casting. As existing 1.2382 cast steel is likely to crack in the heat treatment process, the size of the 1.2382 cast steel die insert is limited. According to the heat treatment casting method, in the heat treatment casting process, an advanced demolding rapid cooling method is adopted to enable the large-size die insert to form metallographical structure organization which is same or similar to that of a small-size die insert, and cracking of the die insert in the follow-up quenching and drawing process is avoided.

Description

technical field [0001] The invention belongs to the technical field of mold casting. Background technique [0002] Casting instead of forging is the development trend of today's mold manufacturing industry. Mold manufacturing technology is developing rapidly. In the manufacture of automobile molds in Europe, America and Japan, the number of castings used accounts for more than 95% of the black materials used in molds. Compared with forgings, using castings to make molds can save a lot of raw materials, save CNC machining costs, reduce kinetic energy consumption, and shorten production cycles. The automotive mold manufacturing industries in developed countries such as Europe, the United States and Japan have taken the lead in using castings instead of forgings to make molds. For example, German mold manufacturing standards require the use of cast high-carbon high-alloy steel materials, such as 1.2382 cast steel. At present, there are many problems in the process of using 1....

Claims

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Application Information

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IPC IPC(8): C21D6/00C21D1/18C21D1/26C21D9/00B22C21/14
CPCB22C21/14C21D1/18C21D1/26C21D6/00C21D9/0068C21D2211/009
Inventor 沈喜堂
Owner CHINA FIRST AUTOMOBILE
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