Molten iron for casting pressure plate castings and casting method for pressure plate castings

A pressure plate and molten iron technology, applied in the field of casting, can solve the problems of shrinkage and porosity at hot joints and high production defect rate, and achieve the effect of reducing production defect rate and eliminating shrinkage and porosity defects

Inactive Publication Date: 2016-08-17
河南星鹏铸件有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process research of pressure plate castings, long-term production of this product is prone to shrinkage and porosity defects at hot joints, and the production defect rate is as high as 7%.

Method used

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  • Molten iron for casting pressure plate castings and casting method for pressure plate castings
  • Molten iron for casting pressure plate castings and casting method for pressure plate castings
  • Molten iron for casting pressure plate castings and casting method for pressure plate castings

Examples

Experimental program
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Effect test

Embodiment 1

[0115] according to Figure 1 to Figure 4Put the upper and lower mold templates of the pressure plate product into the template frame respectively for fastening, after fastening, hang the template frame into the upper and lower template frame positioning sleeves of the two-station molding machine , spray the parting liquid, adjust the compaction force of the molding machine to 0.6MPa, and adjust the excavation position of the sprue cup, and then start the molding. After the mold is built, the interior of the cavity is inspected, and the mold is closed and waits for pouring.

[0116] Add 600kg of pig iron, 900kg of scrap steel and 1500kg of returned materials into a 3-ton medium-frequency induction furnace for smelting. When all of them are melted, slag removal is carried out, and the temperature is raised to 1450°C, and then 75% of ferrosilicon, ferromanganese, copper, soldering iron and tin particles are added for smelting. Adjustment, after the chemical composition of the ad...

Embodiment 2

[0128] The molding process of this embodiment is the same as that of Embodiment 1.

[0129] Add 600kg of pig iron, 900kg of scrap steel and 1500kg of returned material to a 3-ton medium-frequency induction furnace for smelting. When all of them are melted, slag removal is carried out, and the temperature is raised to 1400°C, and then 75% of ferrosilicon, ferromanganese, copper, soldering iron and tin particles are added for smelting. Adjustment, after the chemical composition of the adjusted molten iron meets the requirements of the control standard, the temperature is raised to 1530 ° C, and the chemical composition other than the iron element is obtained as shown in Table 6. Table 6 is the main composition of the molten iron used in Example 2. chemical composition.

[0130] When 600kg±10kg appears on the molten iron weighing display screen, use a forklift to transport the transfer bag containing the molten iron to the pouring section, pour 2.4kg of inoculant into the ladle, ...

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Abstract

The invention provides an iron liquid for casting a pressure plate casting and a casting method of the pressure plate casting. The method comprises the following steps: pouring the iron liquid and an inoculant in a pressure plate casting mould, and performing heat preservation and cooling to obtain the pressure plate casting, wherein the iron liquid contains 3.1-3.2% of C, 1.75-1.85% of Si, 0.8-0.9% of Mn, greater than 0 and less than 0.05% of P, greater than 0 and less than 0.1% of S, 0.2-0.25% of Cu, 0.25-0.3% of Cr, 0.06-0.07% of Sn, greater than 0 and less than 0.02% of Ti and the balance of Fe. According to the invention, by adjusting the content of the chemical components of the iron liquid to the abovementioned range and controlling the content of titanium to below 0.02%, the shrinkage defect at the hot spot of the pressure plate casting can be eliminated so as to reduce the defective rate in production.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a casting method for molten iron used for casting pressure plate castings and pressure plate castings. Background technique [0002] The pressure plate casting is the key casting of the forklift system of the heavy-duty engineering vehicle and belongs to the safety part. The structure of the pressure plate casting is as follows figure 1 with figure 2 as shown, figure 1 is the front view of the pressure plate casting, figure 2 Side view of the pressure plate casting. When producing HT250 pressure plate castings, the technical requirements are: tensile strength ≥ 250MPa, hardness 180HB ~ 255HB. At present, pressure plate castings are generally produced on a multi-contact high-pressure molding automatic production line. When casting, first put the upper and lower mold templates of the pressure plate casting into the template frame respectively for fastening, then hang the te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10
CPCB22D1/00B22D17/00C22C37/06C22C37/10
Inventor 林宗仕郑建华
Owner 河南星鹏铸件有限责任公司
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