CN101545428B - Method for manufacturing electronic unit pump body for diesel engine - Google Patents
Method for manufacturing electronic unit pump body for diesel engine Download PDFInfo
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- CN101545428B CN101545428B CN2009100982076A CN200910098207A CN101545428B CN 101545428 B CN101545428 B CN 101545428B CN 2009100982076 A CN2009100982076 A CN 2009100982076A CN 200910098207 A CN200910098207 A CN 200910098207A CN 101545428 B CN101545428 B CN 101545428B
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title abstract description 15
- 238000005242 forging Methods 0.000 claims abstract description 29
- 238000000304 warm extrusion Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000000137 annealing Methods 0.000 claims abstract description 15
- 239000002253 acid Substances 0.000 claims abstract description 13
- 238000005406 washing Methods 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000314 lubricant Substances 0.000 claims abstract description 7
- 238000010079 rubber tapping Methods 0.000 claims abstract description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 18
- 238000005554 pickling Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 10
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 9
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 9
- 229910017604 nitric acid Inorganic materials 0.000 claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 238000007127 saponification reaction Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 7
- 238000010790 dilution Methods 0.000 claims description 4
- 239000012895 dilution Substances 0.000 claims description 4
- -1 zine oxide Chemical compound 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 12
- 239000002994 raw material Substances 0.000 abstract description 10
- 238000000641 cold extrusion Methods 0.000 abstract description 3
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- 208000021930 chronic lymphocytic inflammation with pontine perivascular enhancement responsive to steroids Diseases 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
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- 238000003754 machining Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 239000000178 monomer Substances 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a method for manufacturing an electronic unit pump body for a diesel engine. When the prior unit pump body is produced, the energy dissipation is high, the consumptive materials are more, and the production efficiency is low. The method comprises processes of blanking, ball blast and inspection, and is characterized by also comprising a cold warm forging process which comprises the steps of warm extrusion shaping, spheroidizing annealing, acid cleaning, primary washing, phosphating, secondary washing, saponifying and cold extrusion finishing, wherein the temperature of the warm extrusion shaping step is between 800 and 850 DEG C, and water-based stamp forging graphite emulsion diluted by 18 to 22 times is used as a surface lubricant; the spheroidizing temperature in the spheroidizing annealing step is between 800 and 820 DEG C, and the tapping temperature is between 600 and 620 DEG C; the acid wash concentration of the acid cleaning step is 10 to 14 degrees, and the acid cleaning time is 15 to 20 minutes; the phosphating solution temperature of the phosphating step is between 75 and 85 DEG C; and the cold extrusion finishing step is carried out at normal temperature, and the used pressure is 1,950 to 2,005MPa. The method has the advantages of high production efficiency, little raw material consumption and low manufacturing cost; and the manufactured unit pump body has good performance.
Description
Technical field
The present invention relates to a kind of making method of electronic unit pump body for diesel engine, relate in particular to a kind of making method that adopts cold warm forging extrusion process to produce electronic unit pump body for diesel engine.
Background technique
Thermal forging technology at present commonly used is produced electronic unit pump body for diesel engine, and the energy that consumes when using thermal forging technology to produce electronic unit pump body for diesel engine is more, and the raw material that expend are more, and manufacturing efficiency is low, the unit pump body poor-performing that is prepared from.Also have at present and adopt the method for machining to produce electronic unit pump body for diesel engine, it is more that the machining mode prepares the raw material that unit pump body consumes, and it is concentrated to produce very big stress on the unit pump body that is prepared from, thereby greatly reduces the performance of unit pump body.
The cold-stamped of use method is also arranged in the technology of other products of preparation at present, as the applying date be on October 30th, 2008, publication number is in 101391368 the Chinese patent, a kind of processing method of deep-hole pin bush parts is disclosed, used cold hobbing precise forming technology to prepare pin bush parts in this patent, but the cold hobbing precise forming technology in this patent is existing common process.And for example the applying date is on November 23rd, 2007, and publication number is in 101172327 the Chinese patent, to disclose a kind of anchor clipper through hole type workblank cold pressing technique, and the cold-extrusion technology in this patent is used in particular for preparing anchor clipper through hole type workblank.The applying date is on December 19th, 2005 for another example, and publication number is in 1986144 the Chinese patent, to disclose a kind of valve rod forging and cold extruding formation process, and this patent has been used cold extruding formation process.In the existing public technology, also have some other use cold extruding formation process to come the technology of preparing product, but identical cold extruding formation process is difficult to apply in other products of preparation, this is because the type and the purposes of other products are all distinct, make product have bigger difference, thereby can not use same cold extruding formation process to prepare different products performance demands.Because electronic unit pump body for diesel engine has higher requirement in mechanical properties such as tensile strength, fatigue strength, wear-resisting propertys, use common cold warm forging extrusion process to be difficult to prepare the electronic unit pump body for diesel engine of function admirable, also do not search out the cold warm forging extrusion process that suitable being used to prepares electronic unit pump body for diesel engine at present.
Summary of the invention
The objective of the invention is to overcome above shortcomings in the prior art, and a kind of consuming little energy is provided, the manufacturing efficiency height, with short production cycle, the making method of the electronic unit pump body for diesel engine that the monomer pump performance that is prepared from is good.
The present invention addresses the above problem the technological scheme that is adopted: the making method of this electronic unit pump body for diesel engine comprises blanking and ball blast operation successively, its characteristics are: also comprise cold warm forging operation, this cold warm forging operation is between blanking operation and ball blast operation, described cold warm forging operation comprises warm extrusion moulding, spheroidizing annealing, pickling, once washing, phosphatization, secondary water washing, saponification and cold-extruded finishing step successively, temperature in the described warm extrusion forming step uses dilution 18-22 water base die forging aquadag doubly as surface lubricant between 800 ℃-850 ℃; Nodularization temperature in the described spheroidizing annealing step is between 800 ℃-820 ℃, and tapping temperature is between 600 ℃-620 ℃; Used pickling solution is the sulfuric acid solution of volume parts 10%-14% in the described acid pickling step, and the pickling time is 15-20 minute; Phosphatization liquid used in the described phosphatization step is made up of nitric acid, zine oxide, phosphoric acid and water, in the present embodiment, and described nitric acid: zine oxide: phosphoric acid: the weight ratio of water is 2.7-2.9: 2.9-3.1: 4.7-4.9: 29-31, the temperature of described phosphatization liquid is between 75 ℃-85 ℃, and phosphating time is between 15-20 minute; Described cold-extruded finishing step is carried out at normal temperatures, and pressure used in this cold-extruded finishing step is between 1950MPa-2005MPa.Make manufacturing efficiency height of the present invention thus, consumption of raw materials is few, low cost of manufacture, and the electronic unit pump body for diesel engine that uses the present invention to be prepared from has stronger tensile strength and fatigue resistance, promote the wear-resisting property of the pump housing, improved the mechanical property of the pump housing greatly.
Temperature in the warm extrusion forming step of the present invention is 825 ℃.Make that thus the effect of warm extrusion moulding is better among the present invention, the material that is used to prepare the pump housing among the present invention is generally 40CrMnMoA, and the critical temperature of 40CrMnMoA is 780 ℃, the present invention carries out the warm extrusion moulding under 825 ℃ temperature, make the pump housing both can obtain good plasticity, can under this temperature, obtain good annealed structure again, make the raw-material standard weave of annealed state delivery not change.
Nodularization temperature in the spheroidizing annealing step of the present invention is 810 ℃, and tapping temperature is 610 ℃.The pump housing that makes the present invention be prepared from thus has more performance, and the purpose of spheroidizing annealing step is the too high problem of material hardness behind the solution warm extrusion among the present invention, thereby improves the plasticity of material and obtain good metallographic structure.The present invention carries out spheroidizing annealing under 810 ℃ temperature can obtain tiny globular pearlite, and these globular pearlites can distribute uniformly, thereby have improved the mechanical property such as tensile strength, fatigue resistance, specific elongation, wear resistance of the pump housing greatly.
Nitric acid in the used phosphatization liquid in the phosphatization step of the present invention: zine oxide: phosphoric acid: water=2.8: 3: 4.8: 30, the temperature of described phosphatization liquid is 80 ℃.Make that thus the phosphatization effect among the present invention is better, the pump housing among the present invention is through after the phosphatization, form the very thin phosphate coating of one deck on the surface, this phosphate coating can be very firm attached on the metal surface, as lubricated supporting course, outside oiling agent can be firm be attached on the supporting course, thereby make the pump housing can obtain very good lubricating layer, reduced extruding force, can prevent effectively that part surface from cracking, can prevent that also material is bonded on the mould, thereby improve the working life of mould.
Used pressure is 2000MPa in the cold-extruded finishing step of the present invention.What make unit pump body that the present invention is prepared from thus is evenly distributed good forming effect.The pump housing finishing that the present invention makes under this pressure is full, and the streamline distribution after the moulding is more all even continuously, and the transition of process fillet has greatly reduced the phenomenon that stress is concentrated, and requires required dimensional accuracy thereby can effectively reach preparation.
Use the water base die forging aquadag of 20 times of dilutions as surface lubricant in the warm extrusion forming step of the present invention.The blank that makes the present invention make in the warm extrusion forming step thus can be good at forming lubricating layer at material surface, makes blank to spin off in the warm extrusion mould very easily.Adopting this water base die forging aquadag to can be good at solving warm extrusion among the present invention is the problem that causes lubricated difficulty hot the extruding down.
The present invention compared with prior art, have the following advantages and effect: the present invention adopts cold warm forging extrusion process to produce diesel electric-controlled unit pump body, the precision of the unit pump body that use the present invention is prepared from is better, the grain refinement of the pump housing, pump housing surface non-oxidation and decarburization phenomenon.
The present invention produces unit pump body with thermal forging technology and compares, and saves material about 50%, raises labour productivity about 80%.The present invention produces unit pump body with mechanical processing technique and compares, and saves material about 70%, and the phenomenon that can greatly avoid stress to concentrate, has strengthened the performance of product, raises labour productivity about 95%.
The present invention is higher to utilization ratio of raw materials, and utilization rate of raw materials can reach about 90%.When the unit pump body that uses the present invention to be prepared from is in cold warm forging technology, the good fluidity of unit pump body interior metal, can form the linear distribution of rational fibre stream in the inside of part, the tensile strength and the fatigue resistance of unit pump body have been improved greatly, strengthen the wear-resisting property of unit pump body, made the mechanical property of unit pump body increase substantially.
The present invention greatly reduces raw-material consumption, has shortened the manufacture cycle of product, has improved manufacturing efficiency.Especially in the raising mechanical properties very big advantage is arranged, country is advocating environmental protection energetically now, and the problem of environmental protection has become today of a global problem, the present invention can reach the above emission standard of Europe III of European environmental requirement, the traditional following emission standard of plunger bushing Europe II in the subrogate country is the novel advantage preparation method who has market prospects.
Description of drawings
Fig. 1 is the process flow diagram of the embodiment of the invention;
Fig. 2 is the main TV structure schematic representation of the pump housing that is prepared from by the embodiment of the invention;
Fig. 3 is the left TV structure schematic representation of Fig. 2.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and by embodiment.
Embodiment:
Referring to Fig. 1-Fig. 3, the present invention comprises blanking operation, cold warm forging operation, ball blast operation, inspection process, packing process and warehouse-in operation successively, and wherein cold warm forging operation comprises warm extrusion forming step, spheroidizing annealing step, acid pickling step, water-washing step, phosphatization step, secondary water washing step, saponification step and a cold-extruded finishing step again successively.
At first carrying out the blanking operation, promptly get blank and put into mould, is to put into the warm extrusion mould among the present invention, and the material of used blank is 40CrMnMoA in the present embodiment, and the 40CrMnMoA material is a prior art, and the blanking operation among the present invention is a prior art.After the blanking operation finishes, just begin cold warm forging operation, what at first carry out is the warm extrusion forming step, blank has been put into the warm extrusion mould in the front, begin now the moulding of blank warm extrusion, present embodiment used temperature in the warm extrusion forming step is 825 ℃, make blank can be distributed in the warm extrusion mould uniformly, present embodiment uses the water base die forging aquadag that has diluted 20 times as surface lubricant in the warm extrusion forming step, the blank that the warm extrusion moulding is prepared from spins off in the warm extrusion mould very easily, and stripping result is fabulous.Temperature used in the warm extrusion forming step of the present invention can be between 800 ℃-850 ℃, and the water base die forging aquadag as surface lubricant of use can dilute 18-22 doubly.
Through having made blank behind the warm extrusion forming step, just carry out the spheroidizing annealing step then, the used nodularization temperature of spheroidizing annealing is 810 ℃ in the present embodiment, used tapping temperature is 610 ℃, nodularization temperature among the present invention in the spheroidizing annealing step can be between 800 ℃-820 ℃, and tapping temperature can be between 600 ℃-620 ℃.Carry out acid pickling step again after the blank process spheroidizing annealing step, the acid pickling step needed time is 18 minutes in the present embodiment, pickling solution is the aqueous solution of sulfuric acid, contain volume fraction in the present embodiment in the used pickling solution and be 12% sulfuric acid, vitriolated volume fraction can be between 10%-14% in the used pickling solution in acid pickling step in the present invention, and the pickling time among the present invention can be between 15-20 minute.Since behind the acid pickling step surface adhesion of blank more acid solution, so blank is carried out water-washing step removing the acid solution that is trapped in the blank surface, a water-washing step of the present invention until blank is washed the pH value more than or equal to 3 till.And then carry out the phosphatization step, the present invention in the phosphatization step used phosphatization liquid by nitric acid, zine oxide, phosphoric acid and water are formed, the weight ratio of each component is a nitric acid in the used phosphatization liquid of present embodiment: zine oxide: phosphoric acid: water=2.8: 3: 4.8: 30, nitric acid in the used phosphatization liquid of the present invention: zine oxide: phosphoric acid: the weight ratio of water can be 2.7-2.9: 2.9-3.1: 4.7-4.9: 29-31, phosphatization liquid temp in the present embodiment is 80 ℃, the used time of phosphatization is 18 minutes, used phosphatization liquid temp can be between 75 ℃-85 ℃ in the phosphatization step in the present invention, and phosphating time can be between 15-20 minute.Because blank is through after the phosphatization step, more phosphatization liquid has been left on the surface of blank, is trapped in the phosphatization liquid on blank surface so blank is carried out the secondary water washing step with removal, and the secondary water washing step also is that blank is washed the pH value more than or equal to till 3 among the present invention.
Blank just carries out saponification step through after the secondary water washing step, gets mass fraction and be 20% the stearic acid soda grease aqueous solution as saponification liquor, and the temperature of saponification is 80 ℃ in the present embodiment, and the temperature of saponification can be between 75 ℃-85 ℃ among the present invention.Just enter cold-extruded finishing step through the blank after the saponification, at normal temperatures blank is put into the cold-extruded mould, then with the pressure control in the mould at 2000MPa, through just having obtained pump housing runic after the cold-extruded finishing step, the metallographic of this pump housing runic is spherical pearly-lustre film and ferrite, and used pressure can be between 1950MPa-2005MPa in cold-extruded finishing step in the present invention.
Through just having obtained pump housing runic after the cold-extruded finishing step, this moment, cold warm forging operation just was through with.Pump housing runic has just entered the ball blast operation then, and the shot diameter is 0.45mm in the ball blast operation of present embodiment, and the shot diameter of ball blast operation can be between 0.4mm-0.5mm among the present invention, has just made pump housing finished product after the pump housing runic process ball blast operation.To the pump housing finished product operation of testing, take out qualified pump housing finished product and carry out packing process then, after packing process finished, product just had been prepared from, and at last product is put in storage operation.
Blanking operation among the present invention, ball blast operation, inspection process, packing process and warehouse-in operation are all same as the prior art or close, no longer describe in detail herein.
The pump housing that the present invention is prepared from is simply introduced below.The pump housing that the present invention is prepared from is made up of pump head 1, pump body 2, pump seat 3 and pump tail 4, and wherein the diameter of pump tail 4 is less than the diameter of pump head 1, and pump head 1, pump body 2, pump seat 3 and pump tail 4 are arranged in order.Also be provided with stationary platen 31, embolism seat stand 32 and automatically controlled seat on the pump seat 3 and insert 33, they and pump seat 3 fuse.Wherein stationary platen 31 is used for fixing the pump housing in use, and embolism seat stand 32 is used for fixing the embolism of diesel engine in use, and automatically controlled seat slotting 33 is used for fixing the electrical-controller of diesel engine in use.
The used raw material of the present invention are economized, and utilization rate of raw materials can reach about 90%, and manufacturing efficiency is higher, and the present invention produces unit pump body with thermal forging technology and compares, and saves material about 50%, and manufacturing efficiency improves about 80%; The present invention produces unit pump body with mechanical processing technique and compares, and saves material about 70%, and manufacturing efficiency improves about 95%, and the phenomenon that can greatly avoid stress to concentrate, has promoted the performance of product.The unit pump body that the present invention is prepared from has stronger tensile strength and fatigue resistance, and stronger wear-resisting property has promoted the mechanical property of unit pump body greatly.
Though the present invention with embodiment openly as above; but it is not in order to limit protection scope of the present invention; any technician who is familiar with this technology, change and the retouching done in not breaking away from design of the present invention and scope all should belong to protection scope of the present invention.
Claims (6)
1. the making method of an electronic unit pump body for diesel engine, comprise blanking and ball blast operation successively, it is characterized in that: also comprise cold warm forging operation, this cold warm forging operation is between blanking operation and ball blast operation, described cold warm forging operation comprises warm extrusion moulding, spheroidizing annealing, pickling, once washing, phosphatization, secondary water washing, saponification and cold-extruded finishing step successively, temperature in the described warm extrusion forming step uses dilution 18-22 water base die forging aquadag doubly as surface lubricant between 800 ℃-850 ℃; Nodularization temperature in the described spheroidizing annealing step is between 800 ℃-820 ℃, and tapping temperature is between 600 ℃-620 ℃; Used pickling solution is the sulfuric acid solution of volume parts 10%-14% in the described acid pickling step, and the pickling time is 15-20 minute; Phosphatization liquid used in the described phosphatization step is made up of nitric acid, zine oxide, phosphoric acid and water, and described nitric acid: zine oxide: phosphoric acid: the weight ratio of water is (2.7-2.9): (2.9-3.1): (4.7-4.9): (29-31), the temperature of described phosphatization liquid is between 75 ℃-85 ℃, and phosphating time is between 15-20 minute; Described cold-extruded finishing step is carried out at normal temperatures, and pressure used in this cold-extruded finishing step is between 1950MPa-2005MPa.
2. the making method of electronic unit pump body for diesel engine according to claim 1, it is characterized in that: the temperature in the described warm extrusion forming step is 825 ℃.
3. the making method of electronic unit pump body for diesel engine according to claim 1, it is characterized in that: the nodularization temperature in the described spheroidizing annealing step is 810 ℃, tapping temperature is 610 ℃.
4. the making method of electronic unit pump body for diesel engine according to claim 1, it is characterized in that: nitric acid in the used phosphatization liquid in the described phosphatization step: zine oxide: phosphoric acid: the weight ratio of water=2.8: 3: 4.8: 30, the temperature of described phosphatization liquid is 80 ℃.
5. the making method of electronic unit pump body for diesel engine according to claim 1, it is characterized in that: used pressure is 2000MPa in the described cold-extruded finishing step.
6. the making method of electronic unit pump body for diesel engine according to claim 2 is characterized in that: use the water base die forging aquadag of 20 times of dilutions as surface lubricant in the described warm extrusion forming step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100982076A CN101545428B (en) | 2009-04-30 | 2009-04-30 | Method for manufacturing electronic unit pump body for diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100982076A CN101545428B (en) | 2009-04-30 | 2009-04-30 | Method for manufacturing electronic unit pump body for diesel engine |
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| CN101545428A CN101545428A (en) | 2009-09-30 |
| CN101545428B true CN101545428B (en) | 2011-07-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103447773A (en) * | 2013-09-11 | 2013-12-18 | 宁波市奇精机械有限公司 | Processing technology for fixed seat |
| CN111805183B (en) * | 2020-07-21 | 2021-09-21 | 湖南省亿利金属制品有限责任公司 | Machining method of electronic control unit pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2384699Y (en) * | 1999-07-16 | 2000-06-28 | 浙江健力钢管有限公司 | Cold-drawn (cold-rolled) bearing steel and seamless steel tube |
| CN1757765A (en) * | 2005-11-03 | 2006-04-12 | 上海保捷汽车零部件锻压有限公司 | Softening method of automobile component part cold extrusion blank |
| CN101259528A (en) * | 2008-01-17 | 2008-09-10 | 王哲 | Non magnetic cemented carbide powder with nickel-vanadium alloys as binder phase and preparation |
| CN101391368A (en) * | 2008-10-30 | 2009-03-25 | 江苏森威精锻有限公司 | Processing method of deep-hole pin bush parts |
-
2009
- 2009-04-30 CN CN2009100982076A patent/CN101545428B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2384699Y (en) * | 1999-07-16 | 2000-06-28 | 浙江健力钢管有限公司 | Cold-drawn (cold-rolled) bearing steel and seamless steel tube |
| CN1757765A (en) * | 2005-11-03 | 2006-04-12 | 上海保捷汽车零部件锻压有限公司 | Softening method of automobile component part cold extrusion blank |
| CN101259528A (en) * | 2008-01-17 | 2008-09-10 | 王哲 | Non magnetic cemented carbide powder with nickel-vanadium alloys as binder phase and preparation |
| CN101391368A (en) * | 2008-10-30 | 2009-03-25 | 江苏森威精锻有限公司 | Processing method of deep-hole pin bush parts |
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