CN106994514A - A kind of method for manufacturing automobile engine balance system mandrel - Google Patents
A kind of method for manufacturing automobile engine balance system mandrel Download PDFInfo
- Publication number
- CN106994514A CN106994514A CN201710262375.9A CN201710262375A CN106994514A CN 106994514 A CN106994514 A CN 106994514A CN 201710262375 A CN201710262375 A CN 201710262375A CN 106994514 A CN106994514 A CN 106994514A
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- powder
- sintering
- automobile engine
- balance system
- engine balance
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/008—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of engine cylinder parts or of piston parts other than piston rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Abstract
The invention discloses a kind of new method for manufacturing automobile engine balance system mandrel.The present invention substitutes original dense material using the trade mark for FN 0205 powdered metallurgical material, the process for machining of dense material is substituted by compression molding, sintering, so that the finished product being made can meet the use requirement of product, the production cost of product is greatly reduced again, technological process is shortened, utilization rate of raw materials brings up to 95% by 30%.
Description
Technical field
It is to be related to a kind of manufacture automobile engine balance system specifically the present invention relates to powder metallurgical technology
The new method of system mandrel.
Background technology
Powder metallurgical technique is to quickly grow and the part production technology with huge applications potentiality, and it, which has, saves energy
Source, high utilization rate of raw materials, low emission, the features such as product of manufacture is cheap, precision is high, quality conformance is high, in machinery
The fields such as manufacture, Aero-Space are widely used.
When engine is in working condition, the movement velocity of piston is very fast, and speed is very uneven.When piston position
When dead-centre position up and down, its speed is zero, but the speed in stop centre position up and down then reaches highest.Because piston is in gas
High-speed straight-line motion repeatedly is done in cylinder, therefore larger inertia force will necessarily be produced on piston, piston pin and connecting rod.Although
Counterweight on connecting rod can effectively balance these inertia force, but only some moving-mass participates in linear motion, another
Subparticipation rotation.Thus in addition to dead-centre position up and down, poised state can not be fully achieved in other inertia force, now
Engine just generates vibration.Balance shaft technology is that a wider technology, its reality simple in construction are applied in automobile engine
With the vehicle that can effectively extenuate motorcycle vibrates, and improves the comfortableness driven.But existing car engine balance shaft
Processing method is more to be prepared using dense material as raw material using process for machining, poor with poor appearance, dimensional accuracy uniformity, plus
Spare time amount is big, and processing process is complicated, artificial to take the defects such as many.
The content of the invention
The technical problems to be solved by the invention are automobile engine balance systems prepared by existing full process for machining
Mandrel poor appearance, dimensional accuracy uniformity are poor, and allowance is big, and processing process is complicated, artificial to take the defects, this hair such as many
Bright to provide a kind of new method for manufacturing automobile engine balance system mandrel, the powdered metallurgical material using the trade mark as FN-0205 is replaced
For original dense material, the process for machining of dense material is substituted by compression molding, sintering so that the finished product being made can
The use requirement of product is met, the production cost of product is greatly reduced again, technique stream is shortened.
In order to solve the above technical problems, the present invention relates to technical scheme it is as follows：
A kind of method for manufacturing automobile engine balance system mandrel, comprises the following steps：By the powder smelting that the trade mark is FN-0205
The component of golden material is mixed on request, compression molding, sintering, shaping, machining, deburring polishing, cleaning, antirust.
Further, the trade mark for FN-0205 powdered metallurgical material based on weight/mass percentage composition, consisting of：Mist
Change iron powder 50%, graphite powder 0.5-0.6%, micro mist wax 0.5-0.7%, copper powder 1-2%, nickel powder 0.8-3%, secondary reduction iron powder 44.8-
46.7%。
Further, by the component of powdered metallurgical material, order is mixed successively on request, including：By atomized iron powder, secondary
Reduced iron powder, graphite powder, micro mist wax, copper powder, nickel powder weigh up weight respectively, by atomized iron powder, secondary reduction iron powder, copper powder, nickel
Powder, graphite powder, the order of micro mist wax sequentially add batch mixer mixing 50-60 minutes, and the powder mixed stands 48-72 hours.
Further, described compression molding, which includes mixing, stands the powder terminated under 480-550MPa pressure
Compression molding obtains pressed compact, and the compression molding speed is 7-10 parts/minute.
Further, described sintering includes：Pressed compact is subjected to three-stage sintering, a preheating section temperature by net strip sintering furnace
Spend for 600-950oC, the temperature of two sintering stages is respectively 1085 ± 5oC、1100±5oC；The network speed of the three-stage sintering is
40-60mm/ minutes, protective atmosphere was 65%-75% nitrogen and 25%-35% hydrogen, and the oxygen content of nitrogen and hydrogen is less than
5ppm, described three sections of sintering time is 45-55 minutes, and the product sintered is sintered blank.
Further, described shaping is whole including sintered blank to be carried out to totally-enclosed molding under 300-350MPa pressure
Shape, the shaping speed is 8-10 parts/minute.
Technique effect and advantage produced by the present invention is as follows：
1st, the present invention substitutes original dense material using the trade mark for FN-0205 powdered metallurgical material, by compression molding, burns
Knot substitutes the process for machining of dense material so that the finished product being made can meet the use requirement of product, and greatly reduction
The production cost of product, shortens technological process, utilization rate of raw materials brings up to 95% by 30%.
2nd, the present invention replaces hot-forging forming in specific implementation using compression molding, is molded using 480-550MPa high pressure
Shaping can guarantee that pressed compact reaches sufficiently high density, and the production efficiency of its compression molding is high, and life cycle of the product is short, each product
Production cycle shorten to 3 days by original 7 days.
3rd, large-scale use automated production during the present invention is embodied again, using being manually greatly decreased, workman's work is strong
Degree is drastically reduced, and is averagely produced when 10,000 products reduce artificial more than 60 hours.
Embodiment
Embodiment 1
By following mass percent feeding：It is atomized iron powder 50%, graphite powder 0.6%, micro mist wax 0.7%, copper powder 1%, nickel powder 1%, secondary
Reduced iron powder 46.7%, the new method of specific manufacture automobile engine balance system mandrel is as follows：
Step P1：Batch mixing
By the component of powdered metallurgical material, once order is mixed on request, including：By atomization, secondary reduction iron powder, graphite powder, micro-
Powder wax, copper powder, nickel powder weigh up weight respectively, by atomized iron powder, secondary reduction iron powder, copper powder, nickel powder, graphite powder, micro mist wax
Order sequentially adds batch mixer and mixed 60 minutes, and the powder mixed stands 48 hours.The powder mixed is stood 48 hours
It is to make the material mixed substantially stabilized, prevents from producing the phenomenon of segregation in feeding process.
Step P2：Compression molding
The P1 finished powders for mixing standing end are transported in press hopper, material are sent by press automatic feed mechanism
In people's mold cavity, compression molding obtains pressed compact under 480MPa pressure, and the compression molding speed is 9/minute.Pressed compact
Density is 6.85g/cm3。
Step P3：Sintering
The pressed compact that P2 compression moldings are obtained carries out three-stage sintering by net strip sintering furnace, and a preheating section temperature is 800oC, two
The temperature of individual sintering stage is respectively 1090oC、1100oC；The network speed of the three-stage sintering is 50mm/ minutes, and protective atmosphere is 75%
Nitrogen and 25% hydrogen, the air inflow of nitrogen is 7m3/ h, inlet pressure is 0.12MPa, nitrogen and hydrogen oxygen content need
Less than 5ppm, described three sections of sintering time is 46 minutes, and the product sintered is sintered blank.The hardness of sintered blank is HRA30-
35, tensile strength is 300-350Mpa.It can be kept away using multi-steps sintering in the micro mist wax during low-temperature zone slowly sufficiently removes pressed compact
Exempt from micro mist wax makes base substrate produce big bubble in high temperature intensive decomposition, and using multi-steps sintering also the elements such as carbon, copper, nickel can penetrate into
In ferrous powder granules structure, form alloy or produce solution strengthening, play a part of improving the combination property of product.
Step P5:Shaping
Resintering base is carried out to totally-enclosed molding shaping under 350MPa pressure, the shaping speed is 10/minute.Shaping is
The deformation produced during copper is oozed in sintering and resintering in order to correct product, the dimensional accuracy and uniformity of product is improved, is production
Product disclosure satisfy that the demand of client in dimensional accuracy.
Step P6：Machining
By the blank obtained by step P5 by machining fine turning outer circle.
Step P7：Deburring is polished
Burr, magazine of product appearance etc. are removed with the method for spiral vibrating grinding and polishing, makes its surface-brightening, cleaning.Polishing
Added abrasive material is 100 kilograms of zirconium oxide abrasive rods, 100 kilograms of alumina porcelain rhombus abrasive materials and brightener, abrasive pastes and 5 kg of water.
Step P8：Cleaning and antirust
The cleaning rust-proof in the cleaning of continuous mesh belt type ultrasonic wave, antirust oil spraying all-in-one of the product after deburring will be polished, is carried
The outward appearance and rustless property of high product, obtain finished product.
Embodiment 2
By following mass percent feeding：Atomized iron powder 50%, graphite powder 0.5%, micro mist wax 0.5%, copper powder 1.5%, nickel powder 1%, two
Secondary reduced iron powder 46.5%, the new method of specific manufacture automobile engine balance system mandrel is as follows：
Step P1：Batch mixing
By the component of powdered metallurgical material, once order is mixed on request, including：By atomization, secondary reduction iron powder, graphite powder, micro-
Powder wax, copper powder, nickel powder weigh up weight respectively, by atomized iron powder, secondary reduction iron powder, copper powder, nickel powder, graphite powder, micro mist wax
Order sequentially adds batch mixer and mixed 55 minutes, and the powder mixed stands 72 hours.The powder mixed is stood 72 hours
It is to make the material mixed substantially stabilized, prevents from producing the phenomenon of segregation in feeding process.
Step P2：Compression molding
The P1 finished powders for mixing standing end are transported in press hopper, material are sent by press automatic feed mechanism
In people's mold cavity, compression molding obtains pressed compact under 500MPa pressure, and the compression molding speed is 9/minute.Pressed compact
Density is 6.91g/cm3。
Step P3：Sintering
The pressed compact that P2 compression moldings are obtained carries out three-stage sintering by net strip sintering furnace, and a preheating section temperature is 950oC, two
The temperature of individual sintering stage is respectively 1085oC、1105oC；The network speed of the three-stage sintering is 50mm/ minutes, and protective atmosphere is 65%
Nitrogen and 35% hydrogen, the air inflow of nitrogen is 7m3/ h, inlet pressure is 0.12MPa, nitrogen and hydrogen oxygen content need
Less than 5ppm, described three sections of sintering time is 46 minutes, and the product sintered is sintered blank.The hardness of sintered blank is HRA32-
38, tensile strength is 310-355Mpa.It can be kept away using multi-steps sintering in the micro mist wax during low-temperature zone slowly sufficiently removes pressed compact
Exempt from micro mist wax makes base substrate produce big bubble in high temperature intensive decomposition, and using multi-steps sintering also the elements such as carbon, copper, nickel can penetrate into
In ferrous powder granules structure, form alloy or produce solution strengthening, play a part of improving the combination property of product.
Step P5:Shaping
Resintering base is carried out to totally-enclosed molding shaping under 320MPa pressure, the shaping speed is 10/minute.Shaping is
The deformation produced during copper is oozed in sintering and resintering in order to correct product, the dimensional accuracy and uniformity of product is improved, is production
Product disclosure satisfy that the demand of client in dimensional accuracy.
Step P6：Machining
By the blank obtained by step P5 by machining fine turning outer circle.
Step P7：Deburring is polished
Burr, magazine of product appearance etc. are removed with the method for spiral vibrating grinding and polishing, makes its surface-brightening, cleaning.Polishing
Added abrasive material is 100 kilograms of zirconium oxide abrasive rods, 100 kilograms of alumina porcelain rhombus abrasive materials and brightener, abrasive pastes and 5 kg of water.
Step P8：Cleaning and antirust
The cleaning rust-proof in the cleaning of continuous mesh belt type ultrasonic wave, antirust oil spraying all-in-one of the product after deburring will be polished, is carried
The outward appearance and rustless property of high product, obtain finished product.
Embodiment 3
By following mass percent feeding：Atomized iron powder 50%, graphite powder 0.6%, micro mist wax 0.55%, copper powder 2%, nickel powder 0.8%,
Secondary reduction iron powder 46.05%, the new method of specific manufacture automobile engine balance system mandrel is as follows：
Step P1：Batch mixing
By the component of powdered metallurgical material, once order is mixed on request, including：By atomization, secondary reduction iron powder, graphite powder, micro-
Powder wax, copper powder, nickel powder weigh up weight respectively, by atomized iron powder, secondary reduction iron powder, copper powder, nickel powder, graphite powder, micro mist wax
Order sequentially adds batch mixer and mixed 50 minutes, and the powder mixed stands 60 hours.The powder mixed is stood 60 hours
It is to make the material mixed substantially stabilized, prevents from producing the phenomenon of segregation in feeding process.
Step P2：Compression molding
The P1 finished powders for mixing standing end are transported in press hopper, material are sent by press automatic feed mechanism
In people's mold cavity, compression molding obtains pressed compact under 530MPa pressure, and the compression molding speed is 9/minute.Pressed compact
Density is 6.92g/cm3。
Step P3：Sintering
The pressed compact that P2 compression moldings are obtained carries out three-stage sintering by net strip sintering furnace, and a preheating section temperature is 600oC, two
The temperature of individual sintering stage is respectively 1080oC、1095oC；The network speed of the three-stage sintering is 50mm/ minutes, and protective atmosphere is 70%
Nitrogen and 30% hydrogen, the air inflow of nitrogen is 7m3/ h, inlet pressure is 0.12MPa, nitrogen and hydrogen oxygen content need
Less than 5ppm, described three sections of sintering time is 46 minutes, and the product sintered is sintered blank.The hardness of sintered blank is HRA35-
42, tensile strength is 340-400Mpa.It can be kept away using multi-steps sintering in the micro mist wax during low-temperature zone slowly sufficiently removes pressed compact
Exempt from micro mist wax makes base substrate produce big bubble in high temperature intensive decomposition, and using multi-steps sintering also the elements such as carbon, copper, nickel can penetrate into
In ferrous powder granules structure, form alloy or produce solution strengthening, play a part of improving the combination property of product.
Step P5:Shaping
Resintering base is carried out to totally-enclosed molding shaping under 300MPa pressure, the shaping speed is 9/minute.Shaping is
The deformation produced during copper is oozed in sintering and resintering in order to correct product, the dimensional accuracy and uniformity of product is improved, is production
Product disclosure satisfy that the demand of client in dimensional accuracy.
Step P6：Machining
By the blank obtained by step P5 by machining fine turning outer circle.
Step P7：Deburring is polished
Burr, magazine of product appearance etc. are removed with the method for spiral vibrating grinding and polishing, makes its surface-brightening, cleaning.Polishing
Added abrasive material is 100 kilograms of zirconium oxide abrasive rods, 100 kilograms of alumina porcelain rhombus abrasive materials and brightener, abrasive pastes and 5 kg of water.
Step P8：Cleaning and antirust
The cleaning rust-proof in the cleaning of continuous mesh belt type ultrasonic wave, antirust oil spraying all-in-one of the product after deburring will be polished, is carried
The outward appearance and rustless property of high product, obtain finished product.
Embodiment 4
By following mass percent feeding：It is atomized iron powder 50%, graphite powder 0.6%, micro mist wax 0.6%, copper powder 1%, nickel powder 3%, secondary
Reduced iron powder 44.8%, the new method of specific manufacture automobile engine balance system mandrel is as follows：
Step P1：Batch mixing
By the component of powdered metallurgical material, once order is mixed on request, including：By atomization, secondary reduction iron powder, graphite powder, micro-
Powder wax, copper powder, nickel powder weigh up weight respectively, by atomized iron powder, secondary reduction iron powder, copper powder, nickel powder, graphite powder, micro mist wax
Order sequentially adds batch mixer and mixed 60 minutes, and the powder mixed stands 55 hours.The powder mixed is stood 55 hours
It is to make the material mixed substantially stabilized, prevents from producing the phenomenon of segregation in feeding process.
Step P2：Compression molding
The P1 finished powders for mixing standing end are transported in press hopper, material are sent by press automatic feed mechanism
In people's mold cavity, compression molding obtains pressed compact under 550MPa pressure, and the compression molding speed is 9/minute.Pressed compact
Density is 7g/cm3。
Step P3：Sintering
The pressed compact that P2 compression moldings are obtained carries out three-stage sintering by net strip sintering furnace, and a preheating section temperature is 800oC, two
The temperature of individual sintering stage is respectively 1090oC、1100oC；The network speed of the three-stage sintering is 45mm/ minutes, and protective atmosphere is 75%
Nitrogen and 25% hydrogen, the air inflow of nitrogen is 7m3/ h, inlet pressure is 0.12MPa, nitrogen and hydrogen oxygen content need
Less than 5ppm, described three sections of sintering time is 50 minutes, and the product sintered is sintered blank.The hardness of sintered blank is HRA40-
48, tensile strength is 400-460Mpa.It can be kept away using multi-steps sintering in the micro mist wax during low-temperature zone slowly sufficiently removes pressed compact
Exempt from micro mist wax makes base substrate produce big bubble in high temperature intensive decomposition, and using multi-steps sintering also the elements such as carbon, copper, nickel can penetrate into
In ferrous powder granules structure, form alloy or produce solution strengthening, play a part of improving the combination property of product.
Step P5:Shaping
Resintering base is carried out to totally-enclosed molding shaping under 340MPa pressure, the shaping speed is 9/minute.Shaping is
The deformation produced during copper is oozed in sintering and resintering in order to correct product, the dimensional accuracy and uniformity of product is improved, is production
Product disclosure satisfy that the demand of client in dimensional accuracy.
Step P6：Machining
By the blank obtained by step P5 by machining fine turning outer circle.
Step P7：Deburring is polished
Burr, magazine of product appearance etc. are removed with the method for spiral vibrating grinding and polishing, makes its surface-brightening, cleaning.Polishing
Added abrasive material is 100 kilograms of zirconium oxide abrasive rods, 100 kilograms of alumina porcelain rhombus abrasive materials and brightener, abrasive pastes and 5 kg of water.
Step P8：Cleaning and antirust
The cleaning rust-proof in the cleaning of continuous mesh belt type ultrasonic wave, antirust oil spraying all-in-one of the product after deburring will be polished, is carried
The outward appearance and rustless property of high product, obtain finished product.
In summary, product material utilization rate of the invention is high, and machining is few, and good appearance, dimensional uniformity is good, fully
Embody the advantage of PM technique " few cutting ".The automobile engine balance system core manufactured using the method for the present invention
Axle, can save material 60%, simplified production procedure；The automobile engine balance system mandrel dimensional uniformity is high, assembles
Cheng Shuchang.The composite powder metallurgy material of the present invention both ensure that product used required comprehensive mechanical property, and production is improved again
The uniformity of product size and comprehensive mechanical property, is that its production cost reduces 85%.
Claims (6)
1. a kind of method for manufacturing automobile engine balance system mandrel, it is characterised in that：By the powder smelting that the trade mark is FN-0205
The component of golden material is mixed on request, compression molding, sintering, shaping, machining, deburring polishing, cleaning, antirust.
2. the method for manufacture automobile engine balance system mandrel as claimed in claim 1, it is characterised in that the trade mark is
FN-0205 powdered metallurgical material based on weight/mass percentage composition, consisting of：Atomized iron powder 50%, graphite powder 0.5-0.6% is micro-
Powder wax 0.5-0.7%, copper powder 1-2%, nickel powder 0.8-3%, secondary reduction iron powder 44.8-46.7%.
3. the method for automobile engine balance system mandrel is manufactured as claimed in claim 2, it is characterised in that by powder metallurgy
Order is mixed the component of material successively on request, including：By atomized iron powder, secondary reduction iron powder, graphite powder, micro mist wax, copper powder,
Nickel powder weighs up weight respectively, adds successively by the order of atomized iron powder, secondary reduction iron powder, copper powder, nickel powder, graphite powder, micro mist wax
Enter batch mixer mixing 50-60 minutes, the powder mixed stands 48-72 hours.
4. the method for automobile engine balance system mandrel is manufactured as claimed in claim 3, it is characterised in that：Described molding
It is molded the powder for including that standing end will be mixed compression molding under 480-550MPa pressure and obtains pressed compact, it is described to be molded into
Type speed is 7-10 parts/minute.
5. the method for automobile engine balance system mandrel is manufactured as claimed in claim 4, it is characterised in that：Described sintering
Including：Pressed compact is subjected to three-stage sintering by net strip sintering furnace, a preheating section temperature is 600-950oC, two sintering stages
Temperature is respectively 1085 ± 5oC、1100±5oC；The network speed of the three-stage sintering is 40-60mm/ minutes, and protective atmosphere is 65%-
The oxygen content of 75% nitrogen and 25%-35% hydrogen, nitrogen and hydrogen is less than 5ppm, and the time of the three-stage sintering is 45-55
Minute, the product sintered is sintered blank.
6. the method for automobile engine balance system mandrel is manufactured as claimed in claim 5, it is characterised in that：Described shaping
Including sintered blank to be carried out to totally-enclosed molding shaping under 300-350MPa pressure, the shaping speed is 8-10 parts/minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710262375.9A CN106994514A (en) | 2017-04-20 | 2017-04-20 | A kind of method for manufacturing automobile engine balance system mandrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710262375.9A CN106994514A (en) | 2017-04-20 | 2017-04-20 | A kind of method for manufacturing automobile engine balance system mandrel |
Publications (1)
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| CN106994514A true CN106994514A (en) | 2017-08-01 |
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ID=59434385
Family Applications (1)
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|---|---|---|---|
| CN201710262375.9A Pending CN106994514A (en) | 2017-04-20 | 2017-04-20 | A kind of method for manufacturing automobile engine balance system mandrel |
Country Status (1)
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101540526A (en) * | 2009-04-10 | 2009-09-23 | 陕西华夏粉末冶金有限责任公司 | Valve plate matrix raw material component for cycloid hydraulic motor and copper infiltration process thereof |
| CN103909269A (en) * | 2014-04-16 | 2014-07-09 | 刘贵平 | Powder metal door closer piston and machining process thereof |
| CN104889380A (en) * | 2015-03-04 | 2015-09-09 | 石家庄精石粉末冶金制造有限公司 | A composition for manufacturing chain pieces of a warp knitting machine and a method of using the same to manufacture chain pieces of a warp knitting machine |
-
2017
- 2017-04-20 CN CN201710262375.9A patent/CN106994514A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101540526A (en) * | 2009-04-10 | 2009-09-23 | 陕西华夏粉末冶金有限责任公司 | Valve plate matrix raw material component for cycloid hydraulic motor and copper infiltration process thereof |
| CN103909269A (en) * | 2014-04-16 | 2014-07-09 | 刘贵平 | Powder metal door closer piston and machining process thereof |
| CN104889380A (en) * | 2015-03-04 | 2015-09-09 | 石家庄精石粉末冶金制造有限公司 | A composition for manufacturing chain pieces of a warp knitting machine and a method of using the same to manufacture chain pieces of a warp knitting machine |
Non-Patent Citations (1)
| Title |
|---|
| 戴维斯 等: "《金属手册案头卷》", 31 January 2011, 机械工业出版社 * |
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Application publication date: 20170801 |