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A kind of preparation method of motorcycle crankshaft powder metallurgy

A technology of powder metallurgy and motorcycles, which is applied to other manufacturing equipment/tools, mechanical equipment, turbines, etc., can solve problems that are difficult to detect, have a great impact on the loss of product density molding machines and molds, and affect manufacturing costs. Effects of improving wear resistance, changing bonding form and pore shape, and solving cracks

Inactive Publication Date: 2016-08-24
江门速龙机车制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material composition affects the manufacturing cost, the product density has a great influence on the loss of the molding machine and the mold, and the crack is mainly affected by the strength of the compact, and it is difficult to detect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of motorcycle crankshaft powder metallurgy, it comprises the following steps:

[0027] (1) Ingredients: The motorcycle crankshaft is made of the following raw materials in weight percentage:

[0028] 0.6% nickel, 0.6% manganese sulfide powder, 0.6% aluminum, 0.6% manganese, 0.4% zinc stearate, 2% modification additive, 25% copper, and the rest is iron;

[0029] Described modification auxiliary agent is to be made from the raw material of following weight part:

[0030] Nano silicon dioxide 100, calcium hydroxide 40, stearic acid 40, dicumyl peroxide 8, polyethylene vinyl acetate 10, sorbitan monooleate 4, nano silicon carbide powder 3, liquid paraffin 3 -4. Vinyl tris(β-methoxyethoxy)silane 0.8, appropriate amount of water;

[0031] The preparation method of described modification auxiliary agent comprises the following steps:

[0032] A. Add the above-mentioned calcium hydroxide in parts by weight to water of equal mass, stir and heat at 110° C....

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Abstract

The invention discloses a method for manufacturing a motorcycle crank shaft through powder metallurgy. The method comprises the following step: the motorcycle crank shaft is manufactured by the following raw materials in percentage by weight: 0.4-0.6 percent of nickel, 0.4-0.6 percent of manganese sulfide powder, 0.4-0.6 percent of aluminium, 0.4-0.6 percent of manganese, 0.3-0.4 percent of zinc stearate, 1-2 percent of performance additive, 21-25 percent of copper and the balance of iron. According to the invention, through the added performance additive, superfine powder is provided in the mixed material, and the superfine powder can be filled in the gaps of large particles, so that apparent density of the mixture is improved; the superfine powder is mainly formed by nano-silicon dioxide and calcium stearate, and through additives including a silane coupling agent and the like, a novel performance additive is obtained, and various physical properties about wear resistance and the like of the product are further improved, and as polyethylene vinyl acetate and liquid petrolatum are taken as lubricants to be added into the performance additive, the effect of the performance additive during mixing and pressing is enhanced, the blank pressing strength of a powder metallurgy structural piece under equal pressing pressure is greatly improved, combination form and pore shape of raw material particles are changed, and the problem about crack generation is solved from the root cause.

Description

technical field [0001] The invention mainly relates to a powder metallurgy preparation method for a motorcycle crankshaft, which belongs to the field of casting. Background technique [0002] With the continuous development of my country's economy, powder metallurgy structures are used more and more widely. As a near net shape technology, powder metallurgy has great economic advantages in the production of structural parts and other parts with large batches, high dimensional accuracy and high processing costs. However, there is a weakness in powder metallurgy structural parts: the compact strength of the product before sintering is very low, which leads to cracks easily appearing during the forming and handling process, and cannot be detected during the manufacturing process. This is a fatal defect in some applications such as key parts of automobiles, which leads to the application of powder metallurgy structural parts only to low- and medium-risk stress-bearing parts, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F5/00B22F1/00
Inventor 吴建平
Owner 江门速龙机车制造有限公司
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