Unlock instant, AI-driven research and patent intelligence for your innovation.

A secondary casting reinforcement material for piston combustion chamber and its manufacturing method

A reinforced material and secondary pouring technology, which is applied in the field of piston manufacturing, can solve the problems of low cooling rate, disturbance of shielding gas, poor thermal fatigue resistance, etc., and achieve the goal of improving throat life, heat resistance, and piston life Effect

Active Publication Date: 2018-06-15
BINZHOU BOHAI PISTON CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the casting molding method of the matrix alloy, its cooling rate is low, resulting in a large alloy phase, which limits the content of heat-resistant phases such as nickel, copper, and iron. The heat resistance of the alloy after remelting is low and cannot meet high requirements. The need to strengthen the engine
Recently, a remelting technology has been developed, which uses wire filling and powder spraying alloying to strengthen the throat and bottom. In this technology, the piston throat and bottom use molten metal powder or welding wire to melt into the remelted aluminum liquid, but this method is complex in process, wire filling or powder spraying disturbs the shielding gas, and pores are prone to occur in the reinforced area
However, if the method of powder coating is adopted, it will also cause the problem of pores, and the powder coating process is too complicated, which is not conducive to mass production
[0003] To sum up, there is still no effective solution to the problem of poor thermal fatigue resistance of the piston combustion chamber in the prior art

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A secondary casting reinforcement material for piston combustion chamber and its manufacturing method
  • A secondary casting reinforcement material for piston combustion chamber and its manufacturing method
  • A secondary casting reinforcement material for piston combustion chamber and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method for manufacturing an aluminum piston using a reinforced material, comprising the steps of:

[0046] Step 1: In the casting process, on the basis of the original holding furnace, add an induction stirring holding furnace for secondary pouring. The composition of the reinforcing material is 3% nickel, 4% copper, and 0.6% iron , 7% silicon, 0.05% titanium, 0.0002% boron, 0.05% manganese, 0.04% zirconium, 0.1% vanadium, except for impurity elements, the balance is aluminum. The temperature control range of molten aluminum is 790-810°C.

[0047] Step 2: Use pouring spoon 1 to scoop up and weigh the aluminum liquid with normal composition with an electronic balance, and then pour the aluminum liquid from the gate in a conventional way, such as figure 1 shown.

[0048] Step 3: In the self-induction stirring and holding furnace, use a small pouring spoon 4 to scoop up aluminum liquid with high alloy content, use a metal funnel 5 to pour it from the riser, and guide t...

Embodiment 2

[0053] A method for manufacturing an aluminum piston using a reinforced material, comprising the steps of:

[0054] Step 1: In the casting process, on the basis of the original holding furnace, add an induction stirring holding furnace for secondary pouring. The reinforcing material contains 7% nickel, 5% copper, 0.8% iron, 5% Silicon, 0.1% magnesium, 0.06% titanium, 0.0003% boron, 0.1% manganese, 0.06% zirconium, 0.11% vanadium, 0.01% scandium, and the balance is aluminum except impurity elements. The aluminum liquid temperature control range is 810-830 ℃.

[0055] Step 2: Use pouring spoon 1 to scoop up and weigh the aluminum liquid with normal composition with an electronic balance, and then pour the aluminum liquid from the gate in a conventional way, such as figure 1 shown.

[0056] Step 3: In the self-induction stirring and holding furnace, use a small pouring spoon 4 to scoop up aluminum liquid with high alloy content, use a metal funnel 5 to pour it from the riser, a...

Embodiment 3

[0061] A method for manufacturing an aluminum piston using a reinforced material, comprising the steps of:

[0062] Step 1: In the casting process, on the basis of the original holding furnace, add an induction stirring holding furnace for secondary pouring. The reinforcing material contains 20% nickel, 6% copper, 4.2% iron, 10% Silicon, 0.3% magnesium, 0.2% titanium, 0.05% boron, 0.2% manganese, 0.1% zirconium, 0.12% vanadium, and the balance is aluminum except impurity elements. The aluminum liquid temperature control range is 850-880 ℃.

[0063] Step 2 to step 4 are as embodiment 1.

[0064] Step 5: Put the rough car piston 8 on the high-frequency welding remelting tool, the piston moves with the tool, the high-frequency welding induction coil 7 enters the piston combustion chamber, the distance between the coil and the piston combustion chamber is 4.0mm, and the high-frequency welding is turned on Power supply, frequency setting 120KHz, power control at 120KW, 1.4 minute...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a secondary pouring reinforcing material for a piston combustion chamber and a manufacturing method, aim to solve the problem in the prior art that the thermal fatigue resistance of the piston combustion chamber part is poor, and are characterized in that the secondary pouring method is adopted in the casting process for changing the components of the combustion chamber part and a 20-500 KHz high frequency welding remelting recrystallization method is adopted in subsequent processing to enable alloy phases such as copper, nickel and ferrum, making the combustion chamber part thick and big, to be refined, so as to achieve the purpose of reinforcing the throat opening; the reinforcing material comprises the following components: 3-40% of nickel, 4-25% of copper, 0.4-20% of ferrum, 5-15% of silicon, 0-0.8% of magnesium, 0.05-5% of titanium, 0.0002-2.5% of boron, 0-0.5% of manganese, 0-0.2% of zirconium, 0.1-0.2% of vanadium, 0-0.5% of scandium, and the balance of aluminum and inevitable impurities, wherein % represents the mass percentage.

Description

technical field [0001] The invention belongs to the field of piston manufacturing, and in particular relates to a secondary pouring reinforcement material for a piston combustion chamber and a manufacturing method. technical background [0002] At present, with the increasingly stringent emission requirements, commercial vehicle engines are developing in the direction of high power and high load, and the degree of strengthening continues to increase. Higher requirements are placed on the performance of the piston, especially the fatigue strength of the piston combustion chamber. In response to this requirement, some engine pistons are made of forged steel, but this material has a large specificity and is difficult to process, which restricts its popularization and application. Some engine pistons add ceramic composite materials to improve the thermal fatigue performance of the piston throat, but the cost of using ceramic composite materials is high, and the quality is diffi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C21/16C22C21/02C22C30/02B22D19/16
CPCB22D19/16C22C19/002C22C19/007C22C19/03C22C21/00C22C21/02C22C21/14C22C21/16C22C30/02
Inventor 刘世英冯增建尚自河李艳军崔岩寿王龙昌李佳张慧玲庞兆杰杜恩民金涛涛
Owner BINZHOU BOHAI PISTON CO LTD