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Preparation method of engine fuel nozzle electromagnetic valve magnetic element

A technology of fuel nozzles and solenoid valves, applied in circuits, magnetic materials, electrical components, etc., can solve the problems of materials that are difficult to achieve saturation magnetic induction, low magnetic properties of materials, and low density of materials, and achieve high magnetic permeability, Easy sintering and densification, high material strength effect

Inactive Publication Date: 2018-03-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other methods, the biggest disadvantage of powder metallurgy to prepare soft magnetic materials is that there will be a certain number of pores in the sintered product, and the material density is low, resulting in relatively low magnetic properties of the material.
For example, the density of soft magnetic materials prepared by metal injection molding can only reach 90% to 95%. Due to pores and other defects, it is difficult for materials to achieve high saturation magnetic induction, high magnetic permeability and low coercive force.

Method used

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  • Preparation method of engine fuel nozzle electromagnetic valve magnetic element
  • Preparation method of engine fuel nozzle electromagnetic valve magnetic element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] All kinds of raw materials are distributed according to the ingredients of 94% iron, 0.8% phosphorus, 5% silicon, and 0.2% carbon, and the powders of various raw materials are ball milled for 2 hours, and the mixed powder and ingredients are 60% paraffin, 20% high-density polymer A binder composed of ethylene, 15% polypropylene and 5% stearic acid was kneaded for 2 hours at a temperature of 165°C at a volume ratio of 60% of the powder to prepare a uniformly mixed injection feed of the binder and powder , The injection feed is formed on an injection molding machine, the forming parameters are: injection temperature 160°C, injection pressure 90MPa, injection speed 80%, pressure holding time 4s, and the molded blank of the magnetic core of the solenoid valve is obtained. First, soak the molded billet in trichlorethylene or n-heptane at a constant temperature of 25°C for 12 hours, and then dry the solvent degreasing billet, then heat the melted billet slowly from room temper...

Embodiment 2

[0026] All kinds of raw materials are batched according to the ingredients of 96% iron, 0.6% phosphorus, 3% silicon and 0.4% chromium, and the powders of various raw materials are ball milled for 2 hours, and the mixed powder and ingredients are 60% paraffin, 20% high-density polymer A binder composed of ethylene, 15% polypropylene and 5% stearic acid was kneaded for 2 hours at a temperature of 165°C at a volume ratio of 60% of the powder to prepare a uniformly mixed injection feed of the binder and powder , The injection feed is formed on an injection molding machine, the forming parameters are: injection temperature 160°C, injection pressure 90MPa, injection speed 80%, pressure holding time 4s, and the molded blank of the magnetic core of the solenoid valve is obtained. First, soak the molded billet in trichlorethylene or n-heptane at a constant temperature of 25°C for 12 hours, and then dry the solvent degreasing billet, then heat the melted billet slowly from room temperatu...

Embodiment 3

[0028]All kinds of raw materials are batched according to the ingredients of 97% iron, 1% phosphorus, 1% silicon, 0.4% chromium and 0.6% manganese, and the powders of various raw materials are ball milled for 2 hours, and the mixed powder and ingredients are 60% paraffin, 20 A binder composed of % high-density polyethylene, 15% polypropylene and 5% stearic acid is mixed at a temperature of 165°C for 2 hours according to the volume ratio of the powder at 60%, and the binder and the powder are mixed uniformly The injection feed is molded on an injection molding machine, and the molding parameters are: injection temperature 160°C, injection pressure 90MPa, injection speed 80%, pressure holding time 4s, and the molded blank of the solenoid valve core is obtained. First, soak the molded billet in trichlorethylene or n-heptane at a constant temperature of 25°C for 12 hours, and then dry the solvent degreasing billet, then heat the melted billet slowly from room temperature to 800°C i...

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Abstract

The invention discloses a preparation method of an engine fuel nozzle electromagnetic valve magnetic element, and belongs to the technical field of engine electromagnetic valve preparation. Firstly, carbonyl iron powder is uniformly mixed with various alloy powder; then, the mixed powder is uniformly mixed with a proper binding agent for mixing at a certain temperature to prepare an injection feedwith uniform mixing and excellent fluidity; and a blank of an electromagnetic valve magnetic element is prepared by adopting an injection molding technology. After the solvent degreasing and the removal of part of the binding agent are performed on an injection blank firstly, the remained binding agent in the blank is totally removed by adopting a heating decomposition method, and the blank is sintered by 1-8 hours at 1200-1400 DEG C to obtain an electromagnetic valve magnetic element product. In the prepared electromagnetic valve magnetic element material, the density is higher than 98%, thesaturated magnetic induction strength B6000 is 1.5-1.7 T, the maximum magnetic conductivity is 5-25 mH / m, the coercivity is less than 160 A / m, the resistivity is 50-100 u omega.cm, and the product size precision is less than +-0.3%.

Description

technical field [0001] The invention belongs to the technical field of engine solenoid valve preparation. In particular, a method for preparing a magnetic core of an engine fuel nozzle electromagnetic valve is provided. Background technique [0002] Solenoid valve is an automatic basic component that controls fluid with electromagnetic force. It is mainly used to adjust the direction, flow, speed and other parameters of the medium in industrial control systems. A solenoid valve usually consists of a solenoid coil and a magnetic core, and is a valve body containing one or several holes. When the coil is energized or de-energized, the operation of the magnetic core will cause the fluid to pass through the valve body or be cut off, so as to achieve the purpose of changing the direction of the fluid. The electronically controlled diesel injection system is the development direction of the modern diesel engine fuel system, and the fastest growing one is the direct digital elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/18C22C38/34C22C38/04C22C38/38B22F1/00B22F3/22B22F3/10H01F1/147
CPCB22F1/0003H01F1/147C22C38/002C22C38/02C22C38/04C22C38/18C22C38/34C22C38/38B22F3/1025B22F3/225B22F2998/10B22F1/103B22F1/108
Inventor 秦明礼孙志远鲁慧峰李睿麻季东廖军华曲选辉
Owner UNIV OF SCI & TECH BEIJING
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