Powder pre-processing method adopted in powder metallurgy technology
A technology of powder pretreatment and powder metallurgy, which is applied in the field of metallurgy, can solve the problems of waste of raw materials, low powder purity, and high carbon content of metal powder, and achieve the effects of saving materials, simple process methods, and good quality parts
Inactive Publication Date: 2014-11-26
无锡柯马机械有限公司
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Problems solved by technology
In the existing technology, the processing of this kind of parts mainly adopts casting and cutting processing, but both casting and machining have the defect of wasting raw materials. In addition, considering the quality of parts, the quality of casting processing can not meet the requirements. Require
In the prior art, pretreatment is generally not carried out before powder metallurgy, resulting in high carbon content of the metal powder, low powder purity, and poor compressibility and flow properties of the powder, which directly leads to poor product quality
Method used
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Embodiment Construction
[0007] A powder pretreatment method in a powder metallurgy process. The metallurgical process includes powder manufacturing, press forming, sintering, and finished product shaping. Powder pretreatment must be carried out before powder manufacturing. Powder pretreatment includes annealing, screening, mixing, granulation and adding Lubricants, the annealing temperature is 50%-60% of the absolute temperature of the powder metal melting point, or higher than this temperature, and a reducing atmosphere is used, and the reducing atmosphere includes hydrogen, decomposed ammonia, converted natural gas, inert atmosphere or vacuum; Sieving is distinguished according to particle size and sedimentation velocity; mixing mainly adopts mechanical method, the mixer is V-shaped mixer, conical mixer or screw mixer, and mechanical method mixing is divided into dry mixing and wet mixing; granulation The granules are made into pellets, and the common equipment for granulation is a cylinder granulat...
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The invention provides a powder pre-processing method adopted in the powder metallurgy technology. The method comprises the steps of annealing, screening, mixing, pelletization and lubricant adding. The annealing temperature is 50%-60% of the absolute melting point of powder metal or even higher. The reducing atmosphere is adopted and comprises hydrogen, decomposed ammonia gas, transformed natural gas, inert atmosphere or vacuum. Screening is conducted according to the grain size based on the settling velocity. Mixing is mainly conducted with the mechanical method, a mixer is a V-shaped mixer, a conical mixer or a screw mixer, and mechanical mixing can be conducted with a dry method or wet method. Pelletization is to change granules into aggregates, and a drum pelletizer or a disc pelletizer is usually adopted for pelletization. According to the powder pre-processing method adopted in the powder metallurgy technology, the method is simple, the quality of parts is good, and materials are saved.
Description
technical field [0001] The invention relates to a powder pretreatment method in a powder metallurgy process, belonging to the technical field of metallurgy. Background technique [0002] Powder metallurgy can be directly made into a variety of mechanical parts, such as automotive friction pads, brake pads, various gears, cams, sprockets and other parts. In the existing technology, the processing of this kind of parts mainly adopts casting and cutting processing, but both casting and machining have the defect of wasting raw materials. In addition, considering the quality of parts, the quality of casting processing can not meet the requirements. Require. In the prior art, pretreatment is generally not performed before powder metallurgy, resulting in high carbon content of the metal powder, low powder purity, and poor compressibility and flow properties of the powder, which directly leads to poor product quality. Contents of the invention [0003] The invention provides a p...
Claims
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Inventor 孙建新
Owner 无锡柯马机械有限公司