CN107695335A - A kind of powder metallurgy prescription and its metallurgical forming method - Google Patents

A kind of powder metallurgy prescription and its metallurgical forming method Download PDF

Info

Publication number
CN107695335A
CN107695335A CN201710736726.5A CN201710736726A CN107695335A CN 107695335 A CN107695335 A CN 107695335A CN 201710736726 A CN201710736726 A CN 201710736726A CN 107695335 A CN107695335 A CN 107695335A
Authority
CN
China
Prior art keywords
parts
powder
iron powder
manganese
sub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710736726.5A
Other languages
Chinese (zh)
Inventor
纪桂林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nantong Crown Powder Metallurgy Co Ltd
Original Assignee
Nantong Crown Powder Metallurgy Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nantong Crown Powder Metallurgy Co Ltd filed Critical Nantong Crown Powder Metallurgy Co Ltd
Priority to CN201710736726.5A priority Critical patent/CN107695335A/en
Publication of CN107695335A publication Critical patent/CN107695335A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02Compacting only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10Sintering only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24After-treatment of workpieces or articles
    • B22F3/26Impregnating
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/02Making ferrous alloys by powder metallurgy
    • C22C33/0257Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/16Ferrous alloys, e.g. steel alloys containing copper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24After-treatment of workpieces or articles
    • B22F2003/241Chemical after-treatment on the surface

Abstract

The present invention relates to a kind of powder metallurgy prescription, including graphite powder, copper powder, stearic acid, zinc oxide, iron powder, vulcanization sub- manganese, aluminum oxide, Cutting free agent, micro mist wax and reinforcing agent;It is characterized in that:Measure by mass:15 parts of graphite powder, 5 10 parts of copper powder, 28 parts of stearic acid, 58 parts of zinc oxide, 50 98 parts of iron powder, vulcanization sub- 0.2 0.5 parts of 15 parts of manganese, 5 10 parts of aluminum oxide, 0.2 0.5 parts of Cutting free agent, 0.5 1 parts of micro mist wax and reinforcing agent;The blank that setting shape is pressed under 60-70MPa pressure is standby;The product blank part is sent into sintering electric furnace and sinters semi-finished articles into;By immersion oil and steam treatment, cleaning obtains finished product;This formula environmental pollution is small, and this method simplifies production stage, improves production efficiency.

Description

A kind of powder metallurgy prescription and its metallurgical forming method
Technical field
The present invention relates to field of powder metallurgy, more particularly to a kind of powder metallurgy prescription and its metallurgical forming method.
Background technology
Powder metallurgy produces metal dust and by the technique such as shaping and sintering by metal dust and non-metal powder The processing method that finished product is made in mixture.
Powder metallurgical technique used by generally, environmental pollution is larger, and in machinery industry, everybody also increasingly advocates Simplified production stage is led, improves production efficiency.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of formula of powder metallurgy, another object of the present invention is to carry For its metallurgical method, this formula environmental pollution is small, and this method simplifies production stage, improves production efficiency.
In order to solve the above technical problems, the technical scheme is that:A kind of powder metallurgy prescription, including graphite powder, copper Powder, stearic acid, zinc oxide, iron powder, vulcanization sub- manganese, aluminum oxide, Cutting free agent, micro mist wax and reinforcing agent;Its innovative point is:Press Mass metrology:Graphite powder 1-5 parts, copper powder 5-10 parts, stearic acid 2-8 parts, zinc oxide 5-8 parts, iron powder 50-98 parts, the sub- manganese of vulcanization 1-5 parts, aluminum oxide 5-10 parts, Cutting free agent 0.2-0.5 parts, micro mist wax 0.5-1 parts and reinforcing agent 0.2-0.5 parts;
The graphite powder, copper powder, zinc oxide, iron powder, the granularity of the sub- manganese of vulcanization and aluminum oxide are 400-600 microns;
The iron powder includes water-atomized iron powder and reduced iron powder, and water-atomized iron powder accounts for mass ratio as 30% in the iron powder, reduced iron Powder accounts for mass ratio as 70%.
A kind of metallurgical forming method of powder metallurgy prescription, its innovative point are:Comprise the following steps:
S1:By graphite powder 1-5 parts, copper powder 5-10 parts, stearic acid 2-8 parts, zinc oxide 5-8 parts, iron powder 50-98 parts, Vulcanize sub- manganese 1-5 parts, aluminum oxide 5-10 parts, Cutting free agent 0.2-0.5 parts, micro mist wax 0.5-1 parts and reinforcing agent 0.2-0.5 Part is well mixed;
S2:The powder that previous step is mixed is put into mould, and the blank that setting shape is pressed under 60-70MPa pressure is standby With;
S3 :The product blank part is sent into sintering electric furnace, temperature 170-250 degree, described product blank sintered Into semi-finished articles;
S4:Described semi-finished articles are cooled down and immersed in machine oil and are handled, 70 DEG C to 90 DEG C, the immersion oil time is 35 minutes to 55 Minute;
S5:The product that upper step is obtained carries out steam treatment, and antirust coat is produced on finished parts surface;
S6:Cleaning obtains finished product.
The advantage of the invention is that:
1)This formula environmental pollution is small, and this method simplifies production stage, improves production efficiency.
Embodiment
The following examples can make professional and technical personnel that the present invention be more fully understood, but therefore not send out this It is bright to be limited among described scope of embodiments.
Embodiment 1:
A kind of powder metallurgy prescription, including graphite powder, copper powder, stearic acid, zinc oxide, iron powder, the sub- manganese of vulcanization, aluminum oxide, easily cut Cut agent, micro mist wax and reinforcing agent;Its innovative point is:Measure by mass:1 part of graphite powder, 5 parts of copper powder, 2 parts of stearic acid, oxidation 5 parts of zinc, 50 parts of iron powder, vulcanization sub- 1 part of manganese, 5 parts of aluminum oxide, 0.2 part of Cutting free agent, 0.5 part of micro mist wax and reinforcing agent 0.2 Part;
The graphite powder, copper powder, zinc oxide, iron powder, the granularity of the sub- manganese of vulcanization and aluminum oxide are 400 microns;
The iron powder includes water-atomized iron powder and reduced iron powder, and water-atomized iron powder accounts for mass ratio as 30% in the iron powder, reduced iron Powder accounts for mass ratio as 70%.
A kind of metallurgical forming method of powder metallurgy prescription, comprises the following steps:
S1:By 1 part of graphite powder, 5 parts of copper powder, 2 parts of stearic acid, 5 parts of zinc oxide, 50 parts of iron powder, sub- 1 part of the manganese of vulcanization, oxygen It is well mixed to change 0.2 part of 5 parts of aluminium, 0.2 part of Cutting free agent, 0.5 part of micro mist wax and reinforcing agent;
S2:The powder that previous step is mixed is put into mould, and the blank that setting shape is pressed under 60MPa pressure is standby;
S3 :The product blank part is sent into sintering electric furnace, 170 degree of temperature, sinters described product blank into half Finished parts;
S4:Described semi-finished articles are cooled down and immersed in machine oil and are handled, 70 DEG C, the immersion oil time is 35 minutes;
S5:The product that upper step is obtained carries out steam treatment, and antirust coat is produced on finished parts surface;
S6:Cleaning obtains finished product.
Embodiment 2:
A kind of powder metallurgy prescription, including graphite powder, copper powder, stearic acid, zinc oxide, iron powder, the sub- manganese of vulcanization, aluminum oxide, easily cut Cut agent, micro mist wax and reinforcing agent;Measure by mass:3 parts of graphite powder, 7 parts of copper powder, 5 parts of stearic acid, 6 parts of zinc oxide, iron powder 75 Part, vulcanization sub- 0.3 part of 3 parts of manganese, 7 parts of aluminum oxide, 0.3 part of Cutting free agent, 0.7 part of micro mist wax and reinforcing agent;
Graphite powder, copper powder, zinc oxide, iron powder, the granularity of the sub- manganese of vulcanization and aluminum oxide are 500 microns;
The iron powder includes water-atomized iron powder and reduced iron powder, and water-atomized iron powder accounts for mass ratio as 30% in the iron powder, reduced iron Powder accounts for mass ratio as 70%.
A kind of metallurgical forming method of powder metallurgy prescription, comprises the following steps:
S1:By 3 parts of graphite powder, 7 parts of copper powder, 5 parts of stearic acid, 6 parts of zinc oxide, 75 parts of iron powder, sub- 3 parts of the manganese of vulcanization, aluminum oxide 7 0.3 part of part, 0.3 part of Cutting free agent, 0.7 part of micro mist wax and reinforcing agent are well mixed;
S2:The powder that previous step is mixed is put into mould, and the blank that setting shape is pressed under 65MPa pressure is standby;
S3 :The product blank part is sent into sintering electric furnace, 210 degree of temperature, sinters described product blank into half Finished parts;
S4:Described semi-finished articles are cooled down and immersed in machine oil and are handled, 80 DEG C, the immersion oil time is 45 minutes;
S5:The product that upper step is obtained carries out steam treatment, and antirust coat is produced on finished parts surface;
S6:Cleaning obtains finished product.
Embodiment 3:
A kind of powder metallurgy prescription, including graphite powder, copper powder, stearic acid, zinc oxide, iron powder, the sub- manganese of vulcanization, aluminum oxide, easily cut Cut agent, micro mist wax and reinforcing agent;Measure by mass:5 parts of graphite powder, 10 parts of copper powder, 8 parts of stearic acid, 8 parts of zinc oxide, iron powder 98 Part, vulcanization sub- 0.5 part of 5 parts of manganese, 10 parts of aluminum oxide, 0.5 part of Cutting free agent, 1 part of micro mist wax and reinforcing agent;
The graphite powder, copper powder, zinc oxide, iron powder, the granularity of the sub- manganese of vulcanization and aluminum oxide are 600 microns;
The iron powder includes water-atomized iron powder and reduced iron powder, and water-atomized iron powder accounts for mass ratio as 30% in the iron powder, reduced iron Powder accounts for mass ratio as 70%.
A kind of metallurgical forming method of powder metallurgy prescription, its innovative point are:Comprise the following steps:
S1:By 5 parts of graphite powder, 10 parts of copper powder, 8 parts of stearic acid, 8 parts of zinc oxide, 98 parts of iron powder, the sub- manganese 5 of vulcanization 0.5 part of part, 10 parts of aluminum oxide, 0.5 part of Cutting free agent, 1 part of micro mist wax and reinforcing agent are well mixed;
S2:The powder that previous step is mixed is put into mould, and the blank that setting shape is pressed under 70MPa pressure is standby;
S3 :The product blank part is sent into sintering electric furnace, 250 degree of temperature, sinters described product blank into half Finished parts;
S4:Described semi-finished articles are cooled down and immersed in machine oil and are handled, 90 DEG C, the immersion oil time is 55 minutes;
S5:The product that upper step is obtained carries out steam treatment, and antirust coat is produced on finished parts surface;
S6:Cleaning obtains finished product.
It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, above-described embodiment and explanation Merely illustrating the principles of the invention described in book, without departing from the spirit and scope of the present invention, the present invention also have Various changes and modifications, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention By appended claims and its equivalent thereof.

Claims (2)

1. a kind of powder metallurgy prescription, including graphite powder, copper powder, stearic acid, zinc oxide, iron powder, the sub- manganese of vulcanization, aluminum oxide, easily Cutting agent, micro mist wax and reinforcing agent;It is characterized in that:Measure by mass:Graphite powder 1-5 parts, copper powder 5-10 parts, stearic acid 2-8 Part, zinc oxide 5-8 parts, iron powder 50-98 parts, the sub- manganese 1-5 parts of vulcanization, aluminum oxide 5-10 parts, Cutting free agent 0.2-0.5 parts, Micro mist wax 0.5-1 parts and reinforcing agent 0.2-0.5 parts;
The graphite powder, copper powder, zinc oxide, iron powder, the granularity of the sub- manganese of vulcanization and aluminum oxide are 400-600 microns;
The iron powder includes water-atomized iron powder and reduced iron powder, and water-atomized iron powder accounts for mass ratio as 30% in the iron powder, reduced iron Powder accounts for mass ratio as 70%.
A kind of 2. metallurgical forming method of powder metallurgy prescription described in claim 1, it is characterised in that:Including following step Suddenly:
S1:By graphite powder 1-5 parts, copper powder 5-10 parts, stearic acid 2-8 parts, zinc oxide 5-8 parts, iron powder 50-98 parts, sulphur Change sub- manganese 1-5 parts, aluminum oxide 5-10 parts, Cutting free agent 0.2-0.5 parts, micro mist wax 0.5-1 parts and reinforcing agent 0.2-0.5 parts It is well mixed;
S2:The powder that previous step is mixed is put into mould, and the blank that setting shape is pressed under 60-70MPa pressure is standby With;
S3 :The product blank part is sent into sintering electric furnace, temperature 170-250 degree, described product blank sintered Into semi-finished articles;
S4:Described semi-finished articles are cooled down and immersed in machine oil and are handled, 70 DEG C to 90 DEG C, the immersion oil time is 35 minutes to 55 Minute;
S5:The product that upper step is obtained carries out steam treatment, and antirust coat is produced on finished parts surface;
S6:Cleaning obtains finished product.
CN201710736726.5A 2017-08-24 2017-08-24 A kind of powder metallurgy prescription and its metallurgical forming method Pending CN107695335A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710736726.5A CN107695335A (en) 2017-08-24 2017-08-24 A kind of powder metallurgy prescription and its metallurgical forming method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710736726.5A CN107695335A (en) 2017-08-24 2017-08-24 A kind of powder metallurgy prescription and its metallurgical forming method

Publications (1)

Publication Number Publication Date
CN107695335A true CN107695335A (en) 2018-02-16

Family

ID=61171185

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710736726.5A Pending CN107695335A (en) 2017-08-24 2017-08-24 A kind of powder metallurgy prescription and its metallurgical forming method

Country Status (1)

Country Link
CN (1) CN107695335A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108273991A (en) * 2018-03-15 2018-07-13 中机锻压江苏股份有限公司 A kind of bearing block metallurgical powder
CN108453251A (en) * 2018-03-15 2018-08-28 江苏中威重工机械有限公司 A kind of motor housing metallurgical powder
CN109513938A (en) * 2018-11-20 2019-03-26 广州市光铭金属制品有限责任公司 A kind of drawing-inroller material and preparation method thereof for wood working machinery
CN109972046A (en) * 2019-04-06 2019-07-05 苏州中鼎冶金有限公司 A kind of processing technology of powder metallurgy planetary gear
CN113020601A (en) * 2021-02-05 2021-06-25 鞠真飞 Throwing fly cutter capable of building body for physical training and manufacturing method thereof
CN114309584A (en) * 2021-12-31 2022-04-12 江苏博瑞工具有限公司 Twist drill with high strength and high cutting performance and manufacturing method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102921945A (en) * 2012-11-21 2013-02-13 王恒傲 Powder metallurgy formula and powder metallurgy method thereof
CN103266271A (en) * 2013-05-29 2013-08-28 东睦(江门)粉末冶金有限公司 Powder metallurgical formula and technology
CN106424707A (en) * 2016-10-19 2017-02-22 广西南宁智翠科技咨询有限公司 High-strength powder metallurgy material of axle parts of automobile
CN106563797A (en) * 2016-10-19 2017-04-19 广西南宁智翠科技咨询有限公司 Automobile axle part powder metallurgical material with large elongation percentage
CN106623891A (en) * 2016-10-19 2017-05-10 广西南宁智翠科技咨询有限公司 Automobile shaft component powder metallurgy material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102921945A (en) * 2012-11-21 2013-02-13 王恒傲 Powder metallurgy formula and powder metallurgy method thereof
CN103266271A (en) * 2013-05-29 2013-08-28 东睦(江门)粉末冶金有限公司 Powder metallurgical formula and technology
CN106424707A (en) * 2016-10-19 2017-02-22 广西南宁智翠科技咨询有限公司 High-strength powder metallurgy material of axle parts of automobile
CN106563797A (en) * 2016-10-19 2017-04-19 广西南宁智翠科技咨询有限公司 Automobile axle part powder metallurgical material with large elongation percentage
CN106623891A (en) * 2016-10-19 2017-05-10 广西南宁智翠科技咨询有限公司 Automobile shaft component powder metallurgy material

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108273991A (en) * 2018-03-15 2018-07-13 中机锻压江苏股份有限公司 A kind of bearing block metallurgical powder
CN108453251A (en) * 2018-03-15 2018-08-28 江苏中威重工机械有限公司 A kind of motor housing metallurgical powder
CN109513938A (en) * 2018-11-20 2019-03-26 广州市光铭金属制品有限责任公司 A kind of drawing-inroller material and preparation method thereof for wood working machinery
CN109972046A (en) * 2019-04-06 2019-07-05 苏州中鼎冶金有限公司 A kind of processing technology of powder metallurgy planetary gear
CN113020601A (en) * 2021-02-05 2021-06-25 鞠真飞 Throwing fly cutter capable of building body for physical training and manufacturing method thereof
CN113020601B (en) * 2021-02-05 2023-03-10 鞠真飞 Throwing fly cutter capable of building body for physical training and manufacturing method thereof
CN114309584A (en) * 2021-12-31 2022-04-12 江苏博瑞工具有限公司 Twist drill with high strength and high cutting performance and manufacturing method thereof

Similar Documents

Publication Publication Date Title
CN107695335A (en) A kind of powder metallurgy prescription and its metallurgical forming method
CN102921945A (en) Powder metallurgy formula and powder metallurgy method thereof
CN101708549B (en) Powder metallurgy technical formula and technical process thereof
CN103406532B (en) A kind of car shaft-type component powder metallurgy material and preparation method thereof
CN102979818B (en) Steel-based iron-nickel alloy diffused-type solid self-lubricating bearing and manufacturing method thereof
CN103831432B (en) Boosting pump for car steering powder metallurgy inner and outer rotors formula and manufacture craft
CN109967746A (en) A kind of manufacturing method and powder metallurgical gear of powder metallurgical gear
CN107552776A (en) A kind of powder metallurgy prescription
CN104550967A (en) Powder metallurgy process
CN101396789A (en) Production technique of ball valve core
CN105312559A (en) Abrasion resistant oil-containing bearing and manufacturing method thereof
CN107695336A (en) A kind of powder metallurgy forming method
CN107671296A (en) A kind of planetary gear powder metallurgy forming method
CN103406534B (en) A kind of Powder metallurgy flange and preparation method thereof
CN203541118U (en) Wire-drawing die box
CN101920720B (en) Plunger body and manufacturing method thereof
CN204565111U (en) A kind of with mould in the shaping of cooling system
CN104162670A (en) Powder metallurgy technology
CN102990068A (en) Powder metallurgy gear
CN111085677A (en) Powder metallurgy forming method
CN107470614A (en) A kind of production technology of sintered metal product
CN108273991A (en) A kind of bearing block metallurgical powder
CN110563465A (en) Mold material for hot press molding and preparation method thereof
CN205324726U (en) Novel motor gear forming die
CN101108420A (en) Technique of manufacturing proportion electro-magnet magnetic yoke powder metallurgy

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20180216

WD01 Invention patent application deemed withdrawn after publication