CN102179515B - Method for increasing density of stainless steel powder metallurgy part - Google Patents
Method for increasing density of stainless steel powder metallurgy part Download PDFInfo
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- CN102179515B CN102179515B CN 201110130719 CN201110130719A CN102179515B CN 102179515 B CN102179515 B CN 102179515B CN 201110130719 CN201110130719 CN 201110130719 CN 201110130719 A CN201110130719 A CN 201110130719A CN 102179515 B CN102179515 B CN 102179515B
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Abstract
The invention discloses a method for increasing the density of a stainless steel powder metallurgy part. The method comprises the following steps of: uniformly mixing 70-90% by mass of stainless steel powder with particle size of 44-75mum and 10-30% by mass of stainless steel powder with particle size of less than 44mum; taking a lithium stearate absolute ethyl alcohol suspension as a die wall lubricant; then respectively heating the mixed powder and the die to 120-160 DEG C; and finally, pressing at high speed of at least 8m/s to form. The density of a green body of the stainless steel powder metallurgy part is increased by 0.04-0.08g/cm<3> as compared with the density of the green body of the stainless steel powder metallurgy part pressed by adopting single 44-75mum warm powder, increased by 0.4g/cm<3> as compared with the density of the green body of the stainless steel powder metallurgy part pressed at room temperature and high speed and increased by 0.7 g/cm<3> as compared with the density of the green body of the stainless steel powder metallurgy part pressed by adopting a warm-pressing technology. In the invention, a warm powder high-speed pressing technology is successfully applied to stainless steel parts, the aim of manufacturing high-performance parts with low cost is achieved, and the development of the high-speed pressing technology in the powder metallurgy field is promoted.
Description
Technical field
The invention belongs to powder metallurgical technology, specifically be meant a kind of method that improves the stainless steel powder metallurgical parts density.
Background technology
Low-cost manufacturing high density, high strength and high accuracy sintered metal product are the developing direction and the research emphasis of powder metallurgy industry, improve the lifting that extrudate density will promote its performance (particularly mechanical property) greatly.For improving the density of sintered metal product, the researchers of powder metallurgy circle have carried out long-term and unremitting effort, have proposed to have promoted the development of powder metallurgy industry like new technologies such as temperature and pressure, warm flow compaction, die wall lubrication, moving magnetic pressure system, high velocity compacted.
High velocity compacted technology (High Velocity Compaction is called for short HVC) is the new technology of a low cost, high efficiency shaping high-density powder metallurgy goods, receives much concern owing to having high cost performance.This technology is proposed in calendar year 2001 U.S.'s metal dust federation by Sweden
AB company; Its basic principle is the tup impact upper punch through high-speed motion; Produce strong stress wave in moment, in 0.02s, impact energy is passed to powder and carry out densified.It and traditional compact technique have many similarities on production technology, like dress powder, filling mould, compacting and the goods demoulding, yet should technology also have the advantages that many tradition compactings do not possess, as: 1. green density is high, and Density Distribution is even; 2. radial elastic aftereffect is low, knockout press is low; 3. production efficiency is high; 4. the large-scale part that can be shaped economically, etc.
Because powder high velocity compacted technology has plurality of advantages; The researcher of a plurality of countries has produced the ranks that great enthusiasm is also put into research one after another to this technology in the world; Some achievements have been obtained: in the article of in " the academic meeting of national powder metallurgy in 2009 ", delivering like Deng Sancai etc. " research of 316L powder of stainless steel die wall lubrication high-speed pressing and forming rule "; Adopt room temperature high velocity compacted technology compacting 316L powder of stainless steel, obtain the highest green density 7.23g/cm
3Though, being suppressed with large increase than tradition, density does not still reach theoretical effect; Pressing speed is not high in the article " electrolytic copper powder high-speed pressing and forming " that Jianzhong Wang equals to deliver on volume the 8th phase " China YouSe Acta Metallurgica Sinica " in 2008 the 18th, and all below 10m/s, the copper powder green density that obtains is still waiting further raising.The temperature and pressure technology of 316L powder of stainless steel has also obtained some achievements: in the article " the warm-pressing technology research of 316L powder of stainless steel " that equals to deliver on volume the 1st phase " powder metallurgy science and engineering " in 2008 the 13rd like Li Chunxiang, green density is up to 6.92g/cm
3, improved 0.26g/cm than room temperature mold pressing
3, but be far from reaching ideal density.
Research shows that the warm powder high velocity compacted technology that the high velocity compacted technology combines with the temperature and pressure technology can effectively improve the density of sintered metal product, yet this technology never applies to powder of stainless steel.
Summary of the invention
The objective of the invention is to overcome the weak point of prior art,, a kind of method that improves the stainless steel powder metallurgical parts density is provided through of the research of stainless steel particle size distribution to green density influence and the utilization of warm powder high velocity compacted technology.
The objective of the invention is to realize through following method.
A kind of method that improves the stainless steel powder metallurgical parts density is taked following measure:
(1) powder of stainless steel particle size distribution:
Get the raw materials ready by following mass percent mixing: particle size 44～75 μ m are 70～90%, and particle size＜44 μ m are 10～30%, and are subsequent use after fully mixing;
(2) adopt the die wall lubrication technology, it is lubricant that lithium stearate absolute ethyl alcohol suspension is selected in said die wall lubrication for use;
(3) stainless steel mixed-powder and mould are heated respectively, the heating-up temperature scope is 120～160 ℃;
(4) the stainless steel mixed-powder after the heating is carried out high-speed pressing and forming stainless steel powder metallurgical part, said high velocity compacted speed is at least 8m/s.
Said mold heated temperature preferable range is 135～145 ℃; Stainless steel mixed-powder heating-up temperature preferable range is 130～140 ℃.
Preferred 10～the 18m/s of said high velocity compacted speed.
Said powder of stainless steel is the 316L powder of stainless steel.
The present invention compared with prior art has following advantage:
1, the present invention is according to the influence of particle size distribution to green density; Proposed to utilize the collocation of varying particle size powder to carry out the technical scheme of warm powder high velocity compacted; Further improve the green density of stainless steel powder metallurgical part, thereby improved the density of stainless steel powder metallurgical part.In the embodiment of the invention 1 as shown in table 1, when high velocity compacted speed was 18m/s, 316L stainless steel powder metallurgical part green density reached 7.64g/cm
3Compare with the part of 316L powder of stainless steel (other process conditions the are constant) high velocity compacted that adopts single 44～75 μ m, green density has improved 0.04～0.08g/cm
3Carry out the 316L stainless steel powder metallurgical part of room temperature high velocity compacted production with the single particle sized powders and compare, green density has improved 0.4g/cm
3More than; Compare with the 316L stainless steel powder metallurgical part that the temperature and pressure technology is produced, green density has improved 0.7g/cm
3More than.
2, the present invention uses homemade powder of stainless steel can obtain highdensity stainless steel powder metallurgical part, has improved the performance and the service life of part effectively.Expand the range of application of homemade powder of stainless steel, can be widely used in industry-by-industries such as automobile, instrument and meter, medicine equipment and chemical industry, and changed the situation of the external expensive patented powder of long-term dependence to a certain extent.
3, adopt the present invention, need not to add lubricant in the stainless steel mixed-powder, not only reduced and taken off the lubricant operation and reduced environmental pollution, also further improved stainless steel powder metallurgical part green density.
4, the present invention is with stock utilization is high, energy-conservation, precision is high, the little near-net-shape temperature powder high velocity compacted technology of pollution successfully applies in the compacting of stainless steel powder metallurgical part; Realized the purpose of low-cost manufacturing severe service components, promoted of the development of warm powder high velocity compacted technology in field of powder metallurgy.
The specific embodiment
Below in conjunction with embodiment the present invention is described in further detail, but embodiment of the present invention is not limited thereto.
Embodiment 1
The present invention improves the method for stainless steel powder metallurgical parts density applicable to stainless steel, and present embodiment is an example with the 316L powder of stainless steel, adopts any brand 316L powder of stainless steel of two kinds of commercially available particle sizes, and this method comprises the steps:
(1) powder of stainless steel particle size distribution:
Get the raw materials ready by following mass percent mixing: particle size 44～75 μ m are 90%, and particle size＜44 μ m are 10%, and are subsequent use after in the efficiently mixed powder machine of V-type, fully mixing;
(2) adopt the die wall lubrication technology, lubricant stearic acid anhydrous lithium alcohol suspension evenly is coated in the surface of cavity impression inwall and upper and lower stamping;
(3) with mold heated to 140 ± 2 ℃, the powder of stainless steel that mixes also is heated to 135 ± 2 ℃;
(4) the stainless steel mixed-powder after the heating is carried out high-speed pressing and forming stainless steel powder metallurgical part; This process is warm powder high velocity compacted; Present embodiment is respectively 10m/s, 12m/s, 14m/s, 16m/s and 18m/s with high velocity compacted speed and does related experiment, and experimental result is as shown in table 1, and table 1 shows high velocity compacted speed and the relation that makes stainless steel powder metallurgical part green density; Increase along with high velocity compacted speed; Green density improves gradually, and when high velocity compacted speed was 18m/s, the green density of stainless steel powder metallurgical part had reached 7.64g/cm
3, working condition permission high velocity compacted speed can be greater than 18m/s.Than disclosed green density 7.23g/cm in the article of in " the academic meeting of national powder metallurgy in 2009 ", delivering " research of 316L powder of stainless steel die wall lubrication high-speed pressing and forming rule "
3High 0.41g/cm
3Rolled up disclosed green density 6.92g/cm in the article of delivering on the 1st phase " powder metallurgy science and engineering " " the warm-pressing technology research of 316L powder of stainless steel " than 2008 the 13rd
3High 0.72g/cm
3
In addition; The present invention proves that suitable particle size distribution can improve stainless steel powder metallurgical part green density; As shown in table 1; Adopt the 316L powder of stainless steel of single 44～75 μ m, the stainless steel powder metallurgical part that high velocity compacted obtains under the constant situation of above-mentioned process conditions, its density is than the low 0.04～0.08g/c m of present embodiment
3
Embodiment 2
A kind of method that improves the stainless steel powder metallurgical parts density comprises the steps:
(1) powder of stainless steel particle size distribution:
Get the raw materials ready by following mass percent mixing: particle size 44～75 μ m are 80%, and particle size＜44 μ m are 20%, and are subsequent use after in the efficiently mixed powder machine of V-type, fully mixing;
(2) adopt the die wall lubrication technology, lubricant stearic acid anhydrous lithium alcohol suspension evenly is coated in the surface of cavity impression inwall and upper and lower stamping;
(3) with mold heated to 140 ± 2 ℃, the powder of stainless steel that mixes also is heated to 135 ± 2 ℃;
(4) the stainless steel mixed-powder after the heating is carried out high-speed pressing and forming stainless steel powder metallurgical part; Present embodiment is respectively 10m/s, 12m/s, 14m/s, 16m/s and 18m/s with high velocity compacted speed and does related experiment; Experimental result high velocity compacted speed is as shown in table 1 with the relation that makes stainless steel powder metallurgical part green density; When high velocity compacted speed was 18m/s, stainless steel powder metallurgical part green density reached 7.62g/cm
3
Embodiment 3
A kind of method that improves the stainless steel powder metallurgical parts density comprises the steps:
(1) powder of stainless steel particle size distribution:
Get the raw materials ready by following mass percent mixing: particle size 44～75 μ m are 70%, and particle size＜44 μ m are 30%, and are subsequent use after in the efficiently mixed powder machine of V-type, fully mixing;
(2) adopt the die wall lubrication technology, lubricant stearic acid anhydrous lithium alcohol suspension evenly is coated in the surface of cavity impression inwall and upper and lower stamping;
(3) with mold heated to 140 ± 2 ℃, the powder of stainless steel that mixes also is heated to 135 ± 2 ℃;
(4) the stainless steel mixed-powder after the heating is carried out high-speed pressing and forming stainless steel powder metallurgical part; Present embodiment is respectively 10m/s, 12m/s, 14m/s, 16m/s and 18m/s with high velocity compacted speed and does related experiment; Experimental result high velocity compacted speed is as shown in table 1 with the relation that makes the part green density; When high velocity compacted speed was 18m/s, stainless steel powder metallurgical part green density reached 7.60g/cm
3
Embodiment 4
A kind of method that improves the stainless steel powder metallurgical parts density comprises the steps:
(1) powder of stainless steel particle size distribution:
Get the raw materials ready by following mass percent mixing: particle size 44～75 μ m are 90%, and particle size＜44 μ m are 10%, and are subsequent use after in the efficiently mixed powder machine of V-type, fully mixing;
(2) adopt the die wall lubrication technology, lubricant stearic acid anhydrous lithium alcohol suspension evenly is coated in the surface of cavity impression inwall and upper and lower stamping;
(3) with mold heated to 125 ± 2 ℃, the powder of stainless steel that mixes also is heated to 122 ± 2 ℃;
(4) the stainless steel mixed-powder after the heating is carried out high-speed pressing and forming stainless steel powder metallurgical part, said high velocity compacted speed is 10m/s.
The green density of gained stainless steel powder metallurgical part is 7.19g/cm
3
Embodiment 5
A kind of method that improves the stainless steel powder metallurgical parts density comprises the steps:
(1) powder of stainless steel particle size distribution:
Get the raw materials ready by following mass percent mixing: particle size 44～75 μ m are 90%, and particle size＜44 μ m are 10%, and are subsequent use after in the efficiently mixed powder machine of V-type, fully mixing;
(2) adopt the die wall lubrication technology, lubricant stearic acid anhydrous lithium alcohol suspension evenly is coated in the surface of cavity impression inwall and upper and lower stamping;
(3) with mold heated to 158 ± 2 ℃, the powder of stainless steel that mixes also is heated to 155 ± 2 ℃;
(4) the stainless steel mixed-powder after the heating is carried out high-speed pressing and forming stainless steel powder metallurgical part, said high velocity compacted speed is 8m/s.
The green density of gained stainless steel powder metallurgical part is 7.01g/cm
3
Table 1
A representes that particle size distribution is meant 44～75 μ m particles in the table 1:＜44 μ m particles, B representes high velocity compacted speed (m/s).
Claims (4)
1. method that improves the stainless steel powder metallurgical parts density, it is characterized in that: this method is taked following measure:
(1) powder of stainless steel particle size distribution:
Get the raw materials ready by following mass percent mixing: particle size 44～75 μ m are 70～90%, and particle size＜44 μ m are 10～30%, and are subsequent use after fully mixing;
(2) adopt the die wall lubrication technology, it is lubricant that lithium stearate absolute ethyl alcohol suspension is selected in said die wall lubrication for use;
(3) stainless steel mixed-powder and mould are heated respectively, the heating-up temperature scope is 120～160 ℃;
(4) the stainless steel mixed-powder after the heating is carried out high-speed pressing and forming stainless steel powder metallurgical part, said high velocity compacted speed is at least 8m/s.
2. a kind of method that improves the stainless steel powder metallurgical parts density according to claim 1 is characterized in that: said mold heated temperature range is 135～145 ℃; Stainless steel mixed-powder heating-up temperature scope is 130～140 ℃.
3. a kind of method that improves the stainless steel powder metallurgical parts density according to claim 1 is characterized in that: said high velocity compacted speed is 10～18m/s.
4. a kind of method that improves the stainless steel powder metallurgical parts density according to claim 1 is characterized in that: said powder of stainless steel is the 316L powder of stainless steel.
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| CN 201110130719 CN102179515B (en) | 2011-05-19 | 2011-05-19 | Method for increasing density of stainless steel powder metallurgy part |
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| CN102814500B (en) * | 2012-08-09 | 2014-04-09 | 山东鼎成新材料有限公司 | Method for manufacturing high-density product with stainless steel powder |
| CN103817331B (en) * | 2014-02-27 | 2016-09-21 | 华南理工大学 | The device and method of powder metallurgy sintered material surface densification is realized by rolling |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1472027A (en) * | 2003-07-09 | 2004-02-04 | 北京科技大学 | Stainless steel powder hot pressing shaping method |
| CN101745638A (en) * | 2010-01-21 | 2010-06-23 | 华南理工大学 | High speed pressing and forming method of warm powder and device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1472027A (en) * | 2003-07-09 | 2004-02-04 | 北京科技大学 | Stainless steel powder hot pressing shaping method |
| CN101745638A (en) * | 2010-01-21 | 2010-06-23 | 华南理工大学 | High speed pressing and forming method of warm powder and device thereof |
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Inventor after: Huang Xinmin Inventor after: Yao Jiasheng Inventor after: Jiang Ronggao Inventor after: Jia Sen Inventor before: Xiao Zhiyu Inventor before: Li Chaojie Inventor before: Lin Xiaowei Inventor before: Zhang Wen Inventor before: Li Yuanyuan |
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Effective date of registration: 20170628 Address after: 511453, B, five floor, standard industrial park, Tai Shi Industrial Zone, Tung Chung Town, Guangzhou, Guangdong, Nansha District 6 Patentee after: GUANGZHOU XUPENG METAL POWDER METALLURGY TECHNOLOGY CO., LTD. Address before: 510640 Tianhe District, Guangdong, No. five road, No. 381, Patentee before: South China University of Technology |
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Granted publication date: 20121205 Termination date: 20180519 |