Metal powder injection molding method for large part

A metal powder and injection molding technology, which is applied in the field of metal powder injection molding of molded parts, can solve problems such as deformation, large parts, and low production efficiency, and achieve uniform overall density, shortened overall process flow, and high production efficiency.

Inactive Publication Date: 2017-11-03
江苏理成科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, metal injection molding technology is basically used to produce small mechanical parts, and the production of large parts (products with a mass greater than or equal to 500g) has the following problems: due to the large parts and heavy weight, the effect of gravity It will cause cracks and deformation at the bottom of the sintered product, and even fail to form, seriously affecting the quality of the sintered product, resulting in high reject rate and low production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] To prepare a gear with a mass of 3kg, take 92% stainless steel powder by weight and 8% binder by weight and mix them uniformly at a temperature of 340°C for 55 minutes, and prepare a feed at a temperature of 200°C Granules: After the granulation is completed, feed the granules into the injection molding machine, heat and control the temperature to 250°C, and then inject them into the mold to form a blank. The injection speed is 50g / s and the pressure is 60Mpa during injection; The pieces are put into the sintering furnace and heated to 250-280°C to remove the binder, and then the blank is sintered in the sintering furnace for the first time. The sintering temperature is 1050°C, the vacuum degree of the sintering furnace is 0.03Pa, and the sintering time is 1h. , and then turn the sintered part after the first sintering by 180°, so that the upper and lower ends of the sintered part are opposite to those of the first sintering, and then carry out the second sintering, the ...

Embodiment 2

[0025] To prepare a gear with a mass of 600g, take 89% by weight of stainless steel powder and 11% by weight of binder and mix them uniformly at a temperature of 350°C for 50 minutes, and prepare a feed at a temperature of 180°C Granules: After the granulation is completed, feed the granules into the injection molding machine, heat and control the temperature to 300°C, and then inject them into the mold to form a blank. The injection speed is 50g / s and the pressure is 60Mpa during injection; The pieces are put into the sintering furnace and heated to 200-280°C to remove the binder, and then the blank is sintered for the first time in the sintering furnace. h, then turn the sintered part after the first sintering by 180°, so that the upper and lower ends of the sintered part are opposite to those of the first sintering, and then carry out the second sintering, the sintering temperature is 1300 ° C, and the vacuum degree of the sintering furnace is 0.03 Pa, the sintering time is...

Embodiment 3

[0027] To prepare a hammer head with a mass of 800g, iron powder with a weight ratio of 92% and a binder with a weight percentage of 8% were mixed uniformly at a temperature of 340°C for 55 minutes, and prepared into a feed at a temperature of 200°C. After the granulation is completed, feed the granules into the injection molding machine, heat and control the temperature to 250°C, and then inject them into the mold to form a blank. The injection speed is 45g / s and the pressure is 60Mpa; The blank is put into the sintering furnace and heated to 280°C to remove the binder, and then the blank is sintered for the first time in the sintering furnace. The sintering temperature is 1150°C, the vacuum degree of the sintering furnace is 0.04Pa, and the sintering time is 1h. Then turn the sintered part 180° after the first sintering, so that the upper and lower ends of the sintered part are opposite to those of the first sintering, and then carry out the second sintering. The sintering te...

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PUM

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Abstract

The invention discloses a metal powder injection molding method for a large part. The metal powder injection molding method includes the following steps that a, metal powder and a bonding agent are mixed evenly, and feed particles are prepared; b, an injection molding machine is used for injecting the feed particles into a die to form a blank; c, the blank is put into a sintering furnace to be heated, a bonding agent is removed along with temperature rising of the sintering furnace, and first-time sintering is conducted in the sintering furnace; and d, a sintered part obtained after first-time sintering is cooled to the room temperature and then overturned by 180 degrees, second-time sintering is conducted, and a finished product is discharged out of the furnace and is obtained. By means of the metal powder injection molding method for the metal part, the blank obtained after the bonding agent is removed is subjected to second-time sintering, the sintered part is overturned before second-time sintering is conducted, the sintering shrinkage rate of all parts is consistent, cracking and deformation cannot be generated on the obtained finished product, the overall density is uniform, compactness is higher than 99.5%, in addition, the overall technological process is shortened, and the production efficiency is high. The metal powder injection molding method is suitable for various kinds of metal raw materials and is also suitable for parts with different thicknesses, and large-batch production can be conducted.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a metal powder injection molding method for molded parts. Background technique [0002] Metal Injection Molding (MIM for short) is a new powder metallurgy molding technology derived from the plastic injection molding industry. As we all know, the production price of plastic injection molding technology is low, and it can produce products with various complex shapes, but the strength of plastic products is not high. In order to improve its performance, the strength and durability of products can be improved by adding metal or ceramic powder to plastic raw materials. Abrasive. In recent years, this idea has been developed to maximize the content of solid particles and completely remove the binder in the subsequent sintering process to densify the formed blank, that is, metal injection molding technology. The basic process steps of metal injection molding are: first select the met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F3/10B22F1/00
CPCB22F3/1017B22F3/1021B22F3/225B22F1/108
Inventor 黄平梁爱民
Owner 江苏理成科技有限公司
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