Nodular cast iron subsoiling shovel tip of agricultural machine and production technique of nodular cast iron subsoiling shovel tip

A technology of agricultural machinery and manufacturing process, which is applied in the field of nodular cast iron sub-loosening shovel tip for agricultural machinery and its manufacturing process, which can solve the problems of increased production cost and high abnormal damage rate, improve production efficiency, solve the problem of easy breakage, low cost, etc. price effect

Inactive Publication Date: 2016-07-20
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the subsoiling shovel tips used by major agricultural machinery manufacturers at home and abroad are made of carbon steel, alloy steel, and high-chromium cast iron, and resin sand and iron mold-coated sand are used as the casting process. After casting, it needs to go through complex heat treatment process, which leads to a significant increase in its production cost
The deep loose shovel tip made of high chromium cast iron has obvious advantages in terms of manufacturing cost and friction and wear resistance, but due to its own brittleness, the abnormal damage rate is extremely high in practical applications

Method used

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  • Nodular cast iron subsoiling shovel tip of agricultural machine and production technique of nodular cast iron subsoiling shovel tip
  • Nodular cast iron subsoiling shovel tip of agricultural machine and production technique of nodular cast iron subsoiling shovel tip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1: According to the technical proposal of the present invention, put Q235B scrap steel, Q18 pig iron, low-carbon ferromanganese and electrolytic copper into the intermediate frequency induction furnace as furnace materials, and use high-purity electrode carburizers for carburization.

[0065] During the spheroidization inoculation, the bottom-packing method is adopted and 2.0% calcium-silicon-aluminum-rare-earth-magnesium alloy and 0.8% calcium-barium-aluminum-silicon-iron alloy are respectively put in as spheroidizing inoculants, and the spheroidizing temperature is 1550°C; when pouring, 0.5% ferrosilicon-zirconium-strontium alloy is used for flow inoculation, the pouring temperature is 1470°C, and the composition of flow inoculant is Si75.21%, Al0.5%, Zr1.15%, Sr2.03%, Ca0.25% , the rest is Fe; the main chemical components in the final molten iron are: C4.0%, Si2.6%, Mn0.5%, P≦0.05%, S≦0.02%, Cu0.3%.

[0066] The negative pressure lost foam casting process ...

Embodiment 2

[0068] Example 2: Put Q235B steel scrap, Q18 pig iron, low-carbon ferromanganese and electrolytic copper into an intermediate frequency induction furnace as furnace materials, and use high-purity electrode carburizers for carburization.

[0069]During the spheroidization inoculation, the bottom-packing method is adopted and 2.0% calcium-silicon-aluminum-rare-earth-magnesium alloy and 0.8% calcium-barium-aluminum-silicon-iron alloy are respectively put in as spheroidizing inoculants, and the spheroidizing temperature is 1550°C; when pouring, 0.5% ferrosilicon-zirconium-strontium alloy is used for flow inoculation, the pouring temperature is 1450°C, and the composition of flow inoculant is Si75.21%, Al0.5%, Zr1.15%, Sr2.03%, Ca0.25% , the rest is Fe; the main chemical components in the final molten iron are: C4.0%, Si2.6%, Mn0.5%, P≦0.05%, S≦0.02%, Cu0.3%.

[0070] The furan resin sand molding is used for casting, the pouring system adopts the bottom injection process, and the u...

Embodiment 3

[0072] Example 3: Put Q235B steel scrap, Q18 pig iron, low-carbon ferromanganese and electrolytic copper into an intermediate frequency induction furnace as furnace materials, and use a high-purity electrode carburizer for carburization.

[0073] During the spheroidization inoculation, the bottom-packing method is adopted and 2.0% calcium-silicon-aluminum-rare-earth-magnesium alloy and 0.8% calcium-barium-aluminum-silicon-iron alloy are respectively put in as spheroidizing inoculants, and the spheroidizing temperature is 1550°C; when pouring, Use 0.5% 75% ferrosilicon pellets for inoculation with flow, the pouring temperature is 1430°C; the main chemical components in the final molten iron are: C4.0%, Si2.6%, Mn0.5%, P≦0.05 %, S≦0.02%, Cu0.3%.

[0074] The negative pressure lost foam casting process is used for casting, the negative pressure is 0.06MPa, the pressure holding time is 5 minutes, and the unpacking time is 15 minutes.

[0075] The subsoiling shovel tip prepared ac...

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Abstract

The invention belongs to the technical field of agricultural machinery, in particular to a nodular cast iron subsoiling shovel tip of an agricultural machine. The subsoiling shovel tip is made of nodular cast iron, wherein the nodular cast iron comprises the following ingredients: 3.6 percent to 4.2 percent of C, 2.3 percent to 3.0 percent of Si, 0.4 percent to 0.7 percent of Mn, 0 percent to 0.05 percent of P, 0 percent to 0.02 percent of S, and 0.2 percent to 0.5 percent of Cu. The invention further relates to a production technique of the subsoiling shovel tip. The production technique comprises the following steps: adding 1.5 percent to 2.5 percent of Ca-Si-Al rare earth magnesium alloy to serve as a nodularizer; adding 0.5 percent to 1.5 percent of Ca-Ba-Al-Si-Fe alloy to serve as a primary inoculant; carrying out spheroidization and primary inoculation according to a ladle bottom pouring method, wherein the spheroidization temperature is 1520 to 1590 DEG C; and adding 0.3 percent to 0.8 percent of Si-Fe-Zr-Sr alloy as a secondary inoculant, wherein secondary inoculation adopts stream inoculation.

Description

technical field [0001] The invention belongs to the field of agricultural machinery, in particular to a nodular cast iron subsoiling shovel tip for agricultural machinery and a manufacturing process thereof. Background technique [0002] Subsoiling shovel tip is the most widely used agricultural tool in farming production. It is in direct contact with the land during the work process, and is subject to the dual effects of soil corrosion and friction and wear. It is an extremely easily damaged consumable. From a technical point of view, the subsoiling shovel tip is required to have a certain wear resistance and impact resistance during use. The former meets its life requirements, and the latter meets its use requirements. [0003] At present, most of the subsoiling shovel tips used by major agricultural machinery manufacturers at home and abroad are made of carbon steel, alloy steel, and high-chromium cast iron, and resin sand and iron mold-coated sand are used as the casting...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/10
CPCC22C37/10C22C33/10C22C37/04
Inventor 姜珂唐喜乐曲迎东尤俊华周裕雄
Owner SHENYANG POLYTECHNIC UNIV
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