High Strength Gas Cylinder Head and Its Production Technology

A production process and gas cylinder technology, which is applied in the field of high-strength gas cylinder head and its production process, can solve the problems of cylinder block and cylinder head waste, uneven hardness of blank castings, and poor inoculation effect, so as to reduce impurities and improve inoculation Quality, the effect of improving the nodularization effect

Active Publication Date: 2020-07-21
宁波力古机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the production process of cylinder block and cylinder head, the poor inoculation effect of molten iron inoculation often leads to defects such as uneven hardness, poor processing performance, shrinkage and leakage of rough castings, which lead to waste products of cylinder block and cylinder head. Therefore, how to choose a good one The inoculant and the correct use method to guide the normal operation of production have become a difficult problem that must be overcome today

Method used

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  • High Strength Gas Cylinder Head and Its Production Technology
  • High Strength Gas Cylinder Head and Its Production Technology
  • High Strength Gas Cylinder Head and Its Production Technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The production process of the high-strength gas cylinder head provided in this embodiment comprises the following steps:

[0027] Step (1): Prepare the charge, select low-S ductile iron pig iron and pure carbon steel scrap, and melt the pig iron and carbon steel scrap at a weight ratio of 7:3; use an intermediate frequency induction furnace to melt the prepared metal charge, Control the smelting temperature at 1500°C, detect the content of each element in the molten iron after melting, and adjust the content of each element to meet the formula requirements, control the range of Mn content in the molten iron to 0.25-0.30wt%, blow argon into the molten iron, blow The gas depth is 20% from the bottom of the furnace, and the gas blowing time is 5 minutes, and then the molten iron is tapped;

[0028] Step (2): Spheroidization and the first inoculation treatment, using the flushing method, adding a nodulizer into the pit of the nodulizer, the composition of the nodulizer is: ...

Embodiment 2

[0032] The production process of the high-strength gas cylinder head provided in this embodiment comprises the following steps:

[0033] Step (1): Prepare the charge, select low-S ductile iron pig iron and pure carbon steel scrap, and a graphite recarburizer with a carbon content of 98%, and smelt the pig iron and carbon steel scrap in a weight ratio of 7:3; Use medium frequency induction furnace to smelt the prepared metal charge, control the smelting temperature at 1550°C, detect the content of each element in the molten iron after melting, and adjust the content of each element to meet the formula requirements, and control the Mn content in the molten iron. The range is 0.25- 0.30wt%, blowing argon into the molten iron, the blowing depth is 40% from the bottom of the furnace, the blowing time is 8 minutes, and then the molten iron is tapped;

[0034] Step (2): Spheroidization and the first inoculation treatment, using the flushing method, adding a nodulizer into the pit of ...

Embodiment 3

[0038] The production process of the high-strength gas cylinder head provided in this embodiment comprises the following steps:

[0039] Step (1): Prepare the charge, select low-S ductile iron pig iron and pure carbon steel scrap, and a graphite recarburizer with a carbon content of 98%, and smelt the pig iron and carbon steel scrap in a weight ratio of 7:3; The prepared metal charge is smelted in an intermediate frequency induction furnace, and the smelting temperature is controlled at 1520°C. After melting, the content of each element in the molten iron is detected, and the content of each element is adjusted to meet the formula requirements. The Mn content in the molten iron is controlled within a range of 0.25- 0.30wt%, blowing argon into the molten iron, the blowing depth is 30% from the bottom of the furnace, the blowing time is 6 minutes, and then the molten iron is tapped;

[0040] Step (2): Spheroidization and the first inoculation treatment, using the flushing method...

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Abstract

The invention discloses a high-strength fuel gas cylinder cover and a production technology thereof. The production technology comprises the following steps that step (1), furnace burdening is prepared, low-S nodular cast iron pig iron and pure carbon waste steel are selected, a medium-frequency induction electric furnace is adopted for smelting, wherein the smelting temperature is controlled to be 1500-1550 DEG C, argon is blown into molten iron, the blowing depth is 20-40% at the depth of the furnace, the blowing time is 5-8 minutes, and then the molten iron is discharged; step (2), spheroidizing and first inoculation treatment are carried out, and a pour over method is adopted; step (3), pouring and a second inoculation treatment are carried out, the pouring temperature of the molten iron is not lower than 1400 DEG C, the second inoculation is carried out by adopting a second nucleating agent during the pouring, and the second inoculation is a metal-stream instantaneous inoculation;step (4), after the pouring is completed, the waste heat of a casting is used for carrying out heat treatment until the room temperature is reached. The technology is reasonable in design, the heat treatment process of the technology is omitted, so that the production cost is reduced, environmental pollution is reduced; and the mechanical property of the fuel gas cylinder cover obtained by the technology is improved correspondingly.

Description

technical field [0001] The invention relates to the technical field of manufacturing gas engine cylinder heads, in particular to a high-strength gas cylinder head and a production process thereof. Background technique [0002] A gas engine is a machine that can convert other forms of energy into another energy, usually chemical energy into mechanical energy. The engine includes a cylinder and a cylinder head. The cylinder head is installed on the upper part of the cylinder, sealing the cylinder from the upper part and forming combustion chamber. [0003] In the production process of cylinder block and cylinder head, the poor inoculation effect of molten iron inoculation often leads to defects such as uneven hardness, poor processing performance, shrinkage and leakage of rough castings, which lead to waste products of cylinder block and cylinder head. Therefore, how to choose a good one The inoculant and the correct use method to guide the normal operation of production have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C22C37/10C22C37/04C21C1/10C21D5/00C21D9/00
CPCC21C1/105C21D5/00C21D9/0068C22C33/08C22C37/04C22C37/10
Inventor 陈海波孙昌建刘昌敬陈瑞红马祥明
Owner 宁波力古机械制造有限公司
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