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Spheroidal graphite cast iron casting mould and riser-free casting method adopting same

A ductile iron and mold technology, applied in the direction of molds, mold components, casting molding equipment, etc., can solve the problems of difficult and no riser-free casting, and achieves simple operation, stable feeding effect, and process technology. The effect of high yield

Inactive Publication Date: 2015-01-28
河北锐利机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even so, since nodular cast iron has volume expansion and contraction at the same time from the pouring temperature to the temperature range of complete solidification, and the shrinkage and expansion are affected by many factors such as chemical composition, pouring temperature, mold properties, solidification process, etc. In actual production, it is difficult to accurately, fully and stably use this expansion to realize feeding. The actual effect is that necessary risers are still required to ensure no shrinkage defects, and real riser-free casting has not been achieved.

Method used

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  • Spheroidal graphite cast iron casting mould and riser-free casting method adopting same
  • Spheroidal graphite cast iron casting mould and riser-free casting method adopting same

Examples

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Effect test

Embodiment 1

[0036] The castings produced in this embodiment are ductile iron shaft sleeve parts, with a minimum wall thickness of 25mm, a maximum wall thickness of 50mm, a thermal pitch circle diameter of 60mm, a single piece weight of 260kg, and a volume of 34dm 3 . Its riserless casting method comprises the following steps:

[0037] Step 1: Close the mold and press it tightly. Compression force (N) = 15 x cavity horizontal projected area (mm 2 ).

[0038] Step 2 pouring: pour the nodular cast iron liquid with a temperature of 1230°C through the pouring system, and pour it into the mold cavity until the liquid level in the sprue and the liquid storage chamber reaches the set position.

[0039] Step 3 Cooling the inrunner: Quickly open the cooling medium of the inrunner cooler to cool and solidify the inrunner.

[0040] Step 4 Pressurization and feeding: within 5 seconds after the ingate is solidified, directly apply a mechanical pressure of 20 MPa on the liquid surface of the ductile i...

Embodiment 2

[0046] The casting in this embodiment is a ductile iron box body, with a minimum wall thickness of 20mm, a maximum wall thickness of 30mm, a thermal pitch circle diameter of 35mm, a single piece weight of 105kg, and a volume of 13.7dm 3 . Its riserless casting method comprises the following steps:

[0047] Step 1: Close the mold and press it tightly. Compression force (N) = 20 × cavity horizontal projected area (mm 2 ).

[0048] Step 2 pouring: pour the nodular cast iron liquid with a temperature of 1280°C through the pouring system, and pour it into the mold cavity until the liquid level in the sprue and the liquid storage chamber reaches the set position.

[0049] Step 3 Cooling the inrunner: Quickly open the cooling medium of the inrunner cooler to cool and solidify the inrunner.

[0050] Step 4 Pressurization and feeding: within 7 seconds after the ingate is solidified, directly apply a mechanical pressure of 12MPa on the liquid surface of the ductile iron in the liqui...

Embodiment 3

[0055] The casting in this embodiment is a nodular cast iron wheel, with a minimum wall thickness of 5mm, a maximum wall thickness of 10mm, a thermal pitch circle diameter of 12mm, a single piece weight of 15kg, and a volume of 2dm 3 . Its riserless casting method comprises the following steps:

[0056] Step 1: Close the mold and press it tightly. Compression force (N) = 30 × cavity horizontal projected area (mm 2 ).

[0057] Step 2 pouring: pour the nodular cast iron liquid with a temperature of 1380°C through the pouring system, and pour it into the mold cavity until the liquid level in the sprue and the liquid storage chamber reaches the set position.

[0058] Step 3 Cooling the inrunner: Quickly open the cooling medium of the inrunner cooler to cool and solidify the inrunner.

[0059] Step 4 Pressurization and feeding: Within 10 seconds after the ingate is solidified, directly apply a mechanical pressure of 1 MPa on the liquid surface of the ductile iron in the liquid ...

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Abstract

The invention relates to the casting field and particularly discloses a spheroidal graphite cast iron casting mould and a riser-free casting method adopting the same. The casting mould is provided with a liquid storing cavity and a pouring gate system. The pouring gate system comprises an inner pouring gate and a straight pouring gate, wherein the inner pouring gate is communicated with a cavity, and the straight pouring gate is communicated with the inner pouring gate. Inner pouring gate coolers are arranged around the inner pouring gate. The riser-free casting method comprises the steps of combination, pouring, pouring gate cooling and forced feeding. The riser-free casting method has the advantages of being high in casting process production yield, stable in casting quality and wide in application range.

Description

technical field [0001] The invention relates to a casting machine, in particular to a nodular cast iron casting mold and a riserless casting method using the casting mold. Background technique [0002] Ductile iron is an important casting material, and its proportion in casting output is increasing year by year, reaching 35% by 2015. In the prior art, the casting techniques for producing ductile iron parts are mainly sand casting, metal casting and centrifugal casting. Among them, when traditional sand casting produces ductile iron parts, due to insufficient mold rigidity, the graphitization expansion of ductile iron is difficult to be used for feeding, and a sufficiently large riser must be set according to the principle of sequential solidification for feeding. In this way, not only the process yield rate is only 60-70%, but also because of late solidification near the riser area, spheroidization recession or graphite floating occurs, shrinkage cavity and shrinkage defect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/08B22C9/02
Inventor 杜占军邢书明
Owner 河北锐利机械科技有限公司
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