CN105499581A - Production method of powder metallurgy cylinder block - Google Patents

Production method of powder metallurgy cylinder block Download PDF

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CN105499581A
CN105499581A CN201410500303.XA CN201410500303A CN105499581A CN 105499581 A CN105499581 A CN 105499581A CN 201410500303 A CN201410500303 A CN 201410500303A CN 105499581 A CN105499581 A CN 105499581A
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cylinder body
temperature
manufacture method
annealing
sintering
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CN105499581B (en
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包崇玺
詹学救
周国燕
毛增光
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NBTM New Materials Group Co Ltd
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NBTM New Materials Group Co Ltd
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Abstract

The invention relates to a production method of a powder metallurgy cylinder block, comprising the following steps: mixing ferrum, chromium, molybdenum, manganese, nickel, carbon and copper according to mass percent to prepare a mixed powder; designing unequal number of bosses on the outer edge of a cylinder block green body; pressing the mixed powder on a pressing machine to form a support green body with density of 6.2-7.2g/cm<3>; sintering at the temperature of 1000-1350 DEG C with duration of 5-180 minutes, and annealing in a non-oxidative atmosphere; extruding on the pressing machine modified from an extrusion moulding machine or a finishing pressing machine, wherein extrusion deformation is greater than or equal to 2% in the diameter direction; and carrying out selective machining according to size requirements, and carrying out steam treatment. The production method has the advantages of being simple in production process, high in precision, and good in surface smoothness, and effectively eliminating the difficulty that a die is easy to crack due to high temperature during forging, thus lowering production cost and improving production efficiency. Compared with conventional powder metallurgy process, the density of a product produced according to the method is relatively high, and surface densification is realized basically.

Description

A kind of manufacture method of powder metallurgy cylinder body
Technical field
The manufacture method of powder metallurgy cylinder body of the present invention, the especially manufacture method of compressor casing.。
Background technology
At present in compressor industry, powerful compressor adopts cast blank to carry out machined.Mach method speed is comparatively slow, and stock utilization is low, and homogeneity of product is poor.Cylinder body coordinates with bearing, and Normal squeezing machine assembles, by cylinder body or bearing being welded on compressor housing.The product processed adopts welding manner assembling when assembling.For the welding of cast iron, owing to being conventional material, Normal squeezing machine factory does not all have large technological problems, and welding quality and weld strength all can ensure preferably.But for powdered metal parts, owing to there is hole, the physical property of the quantity of hole, form and distribution influence material is as pyroconductivity, coefficient of thermal expansion and hardenability etc., and these physical properties directly affect material weldability, makes welding comparatively compare difficulty strengthen with the material that smelts of composition.In common welding cooling procedure, weld seam shrinks and produces larger tensile stress.Percentage elongation due to powdered metallurgical material under the effect of tensile stress is lower, often cracks, and weld strength reduces, and even cannot complete welding process.The powder metallurgy cylinder body application within the compressor of the problems affect of weldability, especially needs the high-power compressor of assemble welding.
For support part, ZL200810163887.0, the patent of ZL200810163886.6, bearing is divided into two parts, skin is the good material of weldability, be generally the material of low-carbon (LC) or highdensity powder metallurgy green compact, internal layer is the green compact of high-carbon, and after ectonexine adopts sintering soldering or sintering, the mode of laser weld links together.Adopt powder metallurgy sintered method for welding and transition block and bearing matrix are realized welding together, reaching the high and requirement that positioning precision is accurate and bonding strength is good of bearing matrix location; Whole welding process is simple and be easy to operation.But it is poor to there is globality, number of molds is more, and part is more, there is the problem that batch production is difficult to coordinate.And shape of block is simple, requires good integrity, be difficult to carry out structure optimization by partitioning scheme.
And for cylinder body, be limited to Welding Problems, powder metallurgical technique can only produce power less and welding cylinder body assembling compressor, market is very restricted.For iron-base powder metallurgy material, improving product density is improve the important direction of weldability one.Generally speaking, density is greater than 7.3g/cm 3the weldability of powdered metallurgical material suitable with common iron.But the raising of density, is limited by the function of product, chemical composition, iron powder performance, forming technology, sintering process and after-processing technology (powder hotforging etc.), therefore, compared with the part of cast iron manufacture, the cost of product increases, and powder metallurgical technique is basic, does not have competitive advantage.
Summary of the invention
Technical problem to be solved by this invention is to provide the simple and manufacture method of the powder metallurgy cylinder body that production cost is low of a kind of easy to make, technique.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of manufacture method of powder metallurgy cylinder body, is characterized in that in turn including the following steps:
1) designing material composition: the material that bearing adopts is sintered steel, and composition is carbon: 0 ~ 1.2%, copper: 0 ~ 5%, nickel: 0 ~ 2%, molybdenum: 0 ~ 2%, chromium: 0 ~ 3%, manganese: 0 ~ 3%, be no more than the inevitable impurity of 2%, iron: surplus, above-mentioned percentage is mass percent;
Wherein, chromium, molybdenum, copper, nickel, manganese add with the form of ferroalloy or foundry alloy or element powder, and carbon adds with form of graphite, then add the lubricant that mass percentage content is 0.1 ~ 1%;
2) green compact are designed: design several boss in the periphery of cylinder body green compact, lug boss position is determined according to welding position during bearing welding assembly;
3) above-mentioned mixed powder being pressed on press density is 6.2 ~ 7.2g/cm 3cylinder body green compact, pressing pressure is greater than 400MPa;
4) sintered in temperature 1000 DEG C ~ 1350 DEG C by bearing green compact, the time of sintering is 5 ~ 180 minutes;
5) anneal in non-oxidizing atmosphere, annealing temperature is 750 ~ 1080 DEG C, the annealing in 5 ~ 200 minutes of annealing temperature retention time, and for after sintering, hardness is lower than the bearing of HRB100, and annealing operation can be alternatively;
6) extrude: the press of being reequiped by single lead screw ex truding briquetting machine or sizing rolling machine extrudes, and its maximum extrusion deformation degree is more than or equal to 2% diametrically, and extrusion die former and plug are at least divided into guide section and sizing section two parts;
7) according to accessory size requirement, processing end face and internal diameter, and carry out steam treatment to after processing according to part requirements; The temperature of steam treatment is 550 ~ 570 DEG C, is incubated 70 ~ 90 minutes, can be alternatively under the condition that steaming step meets the demands in bearing air-tightness.
As improvement, described step 1) in lubricant and graphite adopt bonding processing mode to add.
As improvement, described step 2) boss quantity be 1 ~ 20, the width of boss with highly can be identical, also can be different.
As improvement, described boss is 3 ~ 4, for ears type cylinder body and monaural type cylinder body, the lug of cylinder body is respectively equipped with a boss.
As improvement, described step 3) compacting be adopt warm-pressing formation or mold heated to be shaped.
Improve again, described step 4) sintering carry out in vacuum sintering furnace or based on nitrogen, the ratio of hydrogen is carry out in the sintering furnace of 1 ~ 90vol%.
Improve again, described step 5) annealing, the cooling velocity from annealing temperature to 300 DEG C is less than 2 DEG C/S.
Improve again, described step 4), step 5) sintering and annealing two procedures can unite two into one, temperature is controlled to be incubated in annealing temperature after sintering terminates, according to annealing time and cooling requirement drop to room temperature.
Further improvement, described step 6) extruding centre bore and other holes can be selected as extruded object, compression tool is plug, and its extrusion deformation degree is more than or equal to 2% in diametric(al), namely (in Φ extrusionin-Φ sintered partin)/Φ sintered part× 100%>=2%, for endoporus or the not rounded endoporus of band keyway, can adopt non-homogeneous extruding, then its maximum extrusion deformation degree is more than or equal to 2%, namely (in Φ diametrically extrusion-Φ 1 sintered partin)/Φ sintered partin × 100%>=2%, Φ sintered partfor the internal diameter of sintered state, in Φ extrusionfor the internal diameter of As-extruded.
Further improvement, described step 7) the temperature of steam treatment be 560 DEG C, be incubated 80 minutes.
Compared with prior art, the invention has the advantages that: in the periphery of cylinder body according to design boss in welding position during welding assembly, there is manufacture craft simple, have the advantages that precision is high, surfaces externally and internally fineness is good, effectively eliminate sintering welding or sinter the too much difficult problem of rear laser weld part, reduce solder, thus reduce production cost, improve production efficiency.Compared with prior powder metallurgy technique, the density of product is higher, and local areal density can more than 7.60g/cm 3close to the level of forged steel, surface relative density can reach more than 99%, substantially realize surface densification, do not need when can ensure weld parts like this to adjust welding procedure, carry out welding assembly according to common iron, compared with traditional mo(u)lded piece, intensity is higher, and element precision is higher, decreases a large amount of machining processes.As can be seen from Figure 5, along with the raising of density, the impact property of material, percentage elongation, fatigue behaviour and tensile strength promote all thereupon, improve the combination property of powdered metallurgical material.
Accompanying drawing explanation
Fig. 1 is the structural representation of ears type cylinder blank of the present invention;
Fig. 2 is the structural representation of monaural type cylinder blank of the present invention;
Fig. 3 is extruding former schematic diagram;
Fig. 4 is the hole photo of extruding rear-bank rotor housing excircle;
Fig. 5 is the relation curve of density and mechanical property.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment one:
1, get out raw material, i.e. the mixed powder of siderochrome molybdenum and carbon, its proportioning is: ferroalloy (chromium is 3.0%, and molybdenum is 0.5%, and inevitably other materials, are less than 1%, and iron is surplus) is 99.0%; Carbon is 0.40%, then adds the lubricant that content is 0.60%;
Wherein, chromium, molybdenum add with the form of ferroalloy or foundry alloy or element powder, and carbon adds with form of graphite, then adds lubricant; Lubricant and graphite adopt bonding processing mode to add;
2, the structural representation that green compact: Fig. 1 is ears type cylinder body green compact is designed, Fig. 2 is the structural representation of monaural type cylinder body green compact, 4 boss 2 are designed in the periphery of cylinder body green compact according to welding position during cylinder body 1 welding assembly, for ears type cylinder body, wherein two boss 1 lay respectively on ears, and another two are positioned at cylinder body 1 periphery, for monaural type cylinder body, one of them boss 1 is positioned on monaural, and another three are positioned at cylinder body 1 periphery;
3, above-mentioned mixed powder is made as density 6.65g/cm at the pressure of 600MPa 3cylinder body green compact;
4, sinter, sintered in temperature 1200 DEG C by this cylinder body part, the time of sintering is 20 minutes, sinters and carries out in vacuum sintering furnace;
5, anneal: annealing temperature is 850 DEG C; Atmosphere is nitrogen, annealing temperature retention time be 60 minutes, after annealing from annealing temperature to 300 DEG C cooling velocity be 0.1 DEG C/S;
6, (finishing) is extruded: the press of being reequiped by single lead screw ex truding briquetting machine or sizing rolling machine extrudes, and extrusion deformation degree is greater than 5% in diametric(al), i.e. extrusion deformation degree (Φ sintered partextrusion)/Φ sintered part× 100%>=2%, for the extruding of boss 2, its maximum extrusion deformation degree is more than or equal to 2% diametrically, i.e. (Ri sintered part-Ri extrusion)/Ri sintered part× 100%>=2%, the extrusion deformation degree (Ri of each boss 2 sintered part-Ri extrusion)/Ri sintered part× 100% can be identical, also can be different, Ri sintered partfor the radius of curvature of boss sintered state, Ri extrusionfor the radius of curvature of boss As-extruded; Extrusion die former 3 and plug are at least divided into guide section 31 and sizing section 32 two parts;
7, steam treatment: according to accessory size requirement, processing end face and internal diameter, and carry out steam treatment to after processing according to part requirements, steaming temperature is 560 DEG C, is incubated 80 minutes.
By cylinder body 1 excircle cutting and polishing, Fig. 4 is shown in by its hole photo, and as can be seen from Figure 4, cylinder body 1 excircle realizes densified substantially.
Embodiment two:
1, get out raw material, i.e. the mixed powder of siderochrome molybdenum and carbon, its proportioning is: iron alloy powder (chromium is 3.0%, and molybdenum is 0.5%, and inevitably other materials, are less than 1%, and iron is surplus) is 50%, and straight iron powder is 49.3%; Carbon is 0.3%, then adds the lubricant that content is 0.4%;
Wherein, chromium, molybdenum add with the form of ferroalloy or foundry alloy or element powder, and carbon adds with form of graphite, then adds lubricant; Lubricant and graphite adopt bonding processing mode to add;
2, green compact are designed: with embodiment 1;
3, above-mentioned mixed powder is made as density 6.8g/cm at the pressure of 600MPa 3cylinder body green compact; Compacting adopts warm-pressing formation or mold heated to be shaped;
4, sinter, sintered in temperature 1120 DEG C by this cylinder body part, the time of sintering is 20 minutes, sinters and is carrying out based on nitrogen, in the ratio of the hydrogen sintering furnace at 10vol%;
5, (finishing) is extruded: the press of being reequiped by single lead screw ex truding briquetting machine or sizing rolling machine extrudes, and extrusion deformation degree is greater than 6% in diametric(al), i.e. extrusion deformation degree (Φ sintered partextrusion)/Φ sintered part× 100%>=6%; Extrusion die former 3 is at least divided into two parts: guide section 31 and sizing section 32;
6, steam treatment: according to accessory size requirement, processing end face and internal diameter, and carry out steam treatment to after processing according to part requirements, steaming temperature is 560 DEG C, is incubated 80 minutes.
By cylinder body excircle cutting and polishing, its hole photo can be found out, cylinder body excircle realizes densified substantially.
Embodiment three:
1, raw material is got out, i.e. the mixed powder of iron and carbon: iron powder (inevitably other materials are less than 1%, and iron is surplus) is 99.0%; Carbon is 0.5%, then adds the lubricant that content is 0.5%;
Carbon adds with form of graphite, then adds lubricant; Lubricant and graphite adopt bonding processing mode to add;
2, green compact are designed: with embodiment 1;
3, be density 7.10g/cm by above-mentioned mixed powder temperature and pressure under the pressure of 600MPa 3cylinder body green compact; Compacting adopts warm-pressing formation or mold heated to be shaped;
4, sinter, sintered in temperature 1120 DEG C by this cylinder body part, the temperature retention time of sintering is 30 minutes;
5, (finishing) is extruded: the press of being reequiped by single lead screw ex truding briquetting machine or sizing rolling machine extrudes, and extrusion deformation degree is greater than 4% in diametric(al), i.e. (Φ sintered partextrusion)/Φ sintered part× 100%>=4%; Extrusion die former 3 is at least divided into two parts: guide section 31 and sizing section 32;
6, steam treatment: according to accessory size requirement, processing end face and internal diameter, and carry out steam treatment to after processing according to part requirements, steaming temperature is 560 DEG C, is incubated 80 minutes.
By cylinder body excircle cutting and polishing, its hole photo can be found out, cylinder body excircle realizes densified substantially.
Embodiment four:
1, raw material is got out, i.e. the mixed powder of iron and carbon: iron powder (inevitably other materials are less than 1%, and iron is surplus) is 98.6%; Carbon is 0.8%, then adds the lubricant that content is 0.6%;
Carbon adds with form of graphite, then adds lubricant; Lubricant and graphite adopt bonding processing mode to add;
2, green compact are designed: with embodiment 1;
3, be density 6.40g/cm by above-mentioned mixed powder temperature and pressure under the pressure of 600MPa 3cylinder body green compact;
4, sinter, sintered in temperature 1120 DEG C by this cylinder body part, the temperature retention time of sintering is 30 minutes;
5, (finishing) is extruded: the press of being reequiped by single lead screw ex truding briquetting machine or sizing rolling machine extrudes, and extrusion deformation degree is greater than 10% in diametric(al), i.e. (Φ sintered partextrusion)/Φ sintered part× 100%>=10%; Extrusion die former 3 is at least divided into two parts: guide section 31 and sizing section 32;
6, steam treatment: according to accessory size requirement, processing end face and internal diameter, and carry out steam treatment to after processing according to part requirements, steaming temperature is 560 DEG C, is incubated 80 minutes.
By cylinder body excircle cutting and polishing, its hole photo can be found out, cylinder body excircle realizes densified substantially.
Embodiment five:
1, raw material is got out, i.e. the mixed powder of iron, copper and carbon: iron powder (inevitably other materials are less than 1%, and iron is surplus) is 97.0%; Copper is 2%; Carbon is 0.5%, then adds the lubricant that content is 0.5%;
Wherein, copper adds with the form of ferroalloy or foundry alloy or element powder, and carbon adds with form of graphite, then adds lubricant; Lubricant and graphite adopt bonding processing mode to add;
2, green compact are designed: with embodiment 1;
3, be density 7.00g/cm by above-mentioned mixed powder temperature and pressure under the pressure of 600MPa 3cylinder body green compact; Compacting adopts warm-pressing formation or mold heated to be shaped;
4, sinter, sintered in temperature 1120 DEG C by this cylinder body part, the temperature retention time of sintering is 30 minutes;
5, (finishing) is extruded: the press of being reequiped by single lead screw ex truding briquetting machine or sizing rolling machine extrudes, and extrusion deformation degree is greater than 5% in diametric(al), i.e. (Φ sintered partextrusion)/Φ sintered part× 100%>=5%; Extrusion die former 3 is at least divided into two parts: guide section 31 and sizing section 32;
6, steam treatment: according to accessory size requirement, processing end face and internal diameter, and carry out steam treatment to after processing according to part requirements, steaming temperature is 560 DEG C, is incubated 80 minutes.
By cylinder body excircle cutting and polishing, its hole photo can be found out, cylinder body excircle realizes densified substantially.
Embodiment six:
1, raw material is got out, i.e. the mixed powder of iron, copper and carbon: iron powder (inevitably other materials are less than 1%, and iron is surplus) is 96.5%; Copper is 2%; Carbon is 0.8%, then adds the lubricant that content is 0.7%;
Wherein, copper adds with the form of ferroalloy or foundry alloy or element powder, and carbon adds with form of graphite, then adds lubricant; Lubricant and graphite adopt bonding processing mode to add;
2, green compact are designed: with embodiment 1;
3, be density 6.80g/cm by above-mentioned mixed powder temperature and pressure under the pressure of 600MPa 3cylinder body green compact;
4, sinter, sintered in temperature 1120 DEG C by this cylinder body part, the temperature retention time of sintering is 30 minutes;
5, anneal: the anneal by this support part in temperature being 820 DEG C, annealing temperature retention time is 60 minutes, is chilled to room temperature after annealing with the cooling velocity of 0.2 DEG C/sec;
6, (finishing) is extruded: the press of being reequiped by single lead screw ex truding briquetting machine or sizing rolling machine extrudes, and extrusion deformation degree is greater than 7% in diametric(al), i.e. (Φ sintered partextrusion)/Φ sintered part× 100%>=7%, extrusion die former 3 is at least divided into two parts: guide section 31 and sizing section 32;
7, steam treatment: according to accessory size requirement, processing end face and internal diameter, and carry out steam treatment to after processing according to part requirements, steaming temperature is 560 DEG C, is incubated 80 minutes.
By cylinder body excircle cutting and polishing, its hole photo can be found out, cylinder body excircle realizes densified substantially.
Embodiment seven:
1, get out raw material, i.e. the mixed powder of iron molybdenum copper nickel and carbon, its proportioning is: iron copper molybdenum nickel alloy part powder (molybdenum is 0.50%, and nickel is 1.75%, and copper is 1.5%, and inevitably other materials, are less than 1%, and iron is surplus) is 98.6%; Carbon is 0.9%, then adds the lubricant that content is 0.5%;
Wherein, molybdenum, copper, nickel add with the form of ferroalloy or foundry alloy or element powder, and carbon adds with form of graphite, then adds lubricant; Lubricant and graphite adopt bonding processing mode to add;
2, green compact are designed: with embodiment 1;
3, be density 6.90g/cm by above-mentioned mixed powder temperature and pressure under the pressure of 600MPa 3cylinder body green compact; Compacting adopts warm-pressing formation or mold heated to be shaped;
4, sinter, sintered in temperature 1120 DEG C by this cylinder body part, the temperature retention time of sintering is 30 minutes;
5, anneal: the anneal by this support part in temperature being 850 DEG C, annealing temperature retention time is 40 minutes, is chilled to room temperature after annealing with the cooling velocity of 0.3 DEG C/sec;
6, (finishing) is extruded: the press of being reequiped by single lead screw ex truding briquetting machine or sizing rolling machine extrudes, and extrusion deformation degree is greater than 6% in diametric(al), i.e. (Φ sintered partextrusion)/Φ sintered part× 100%>=6%, extrusion die former 3 is at least divided into two parts: guide section 31 and sizing section 32;
7, steam treatment: according to accessory size requirement, processing end face and internal diameter, and carry out steam treatment to after processing according to part requirements, steaming temperature is 560 DEG C, is incubated 80 minutes.
8, the roughness of compressive surface is measured: Ra is 0.12, Rz is 1.30.
Embodiment eight:
1, get out raw material, i.e. the mixed powder of Fe, Mn, Cu and carbon, its proportioning is: ferromanganese powder (manganese is 73%, and inevitably other materials, are less than 3%, and iron is surplus) is 3%; Straight iron powder is 94.7%; Carbon is 0.3%; Copper is 1.5%; Then the lubricant that content is 0.5% is added;
Wherein, manganese, copper add with the form of ferroalloy or foundry alloy or element powder, and carbon adds with form of graphite, then adds lubricant; Lubricant and graphite adopt bonding processing mode to add;
2, green compact are designed: with embodiment 1;
3, above-mentioned mixed powder is made as density 7.1g/cm at the pressure of 600MPa 3cylinder body green compact; Compacting adopts warm-pressing formation or mold heated to be shaped;
4, sinter, sintered in temperature 1120 DEG C by this cylinder body part, the temperature retention time of sintering is 60 minutes;
5, (finishing) is extruded: the press of being reequiped by single lead screw ex truding briquetting machine or sizing rolling machine extrudes, and extrusion deformation degree is greater than 3% in diametric(al), i.e. (Φ sintered partextrusion)/Φ sintered part× 100%>=3%.Extrusion die former 3 is at least divided into two parts: guide section 31 and sizing section 32;
6, steam treatment: according to accessory size requirement, processing end face and internal diameter, and carry out steam treatment to after processing according to part requirements, steaming temperature is 560 DEG C, is incubated 80 minutes.
By cylinder body excircle cutting and polishing, its hole photo can be found out, cylinder body excircle realizes densified substantially.

Claims (10)

1. a manufacture method for powder metallurgy cylinder body, is characterized in that in turn including the following steps:
1) designing material composition: the material that bearing adopts is sintered steel, and composition is carbon: 0 ~ 1.2%, copper: 0 ~ 5%, nickel: 0 ~ 2%, molybdenum: 0 ~ 2%, chromium: 0 ~ 3%, manganese: 0 ~ 3%, be no more than the inevitable impurity of 2%, iron: surplus, above-mentioned percentage is mass percent;
Wherein, chromium, molybdenum, copper, nickel, manganese add with the form of ferroalloy or foundry alloy or element powder, and carbon adds with form of graphite, then add the lubricant that mass percentage content is 0.1 ~ 1%;
2) green compact are designed: design several boss in the periphery of cylinder body green compact, lug boss position is determined according to welding position during bearing welding assembly;
3) above-mentioned mixed powder being pressed on press density is 6.2 ~ 7.2g/cm 3cylinder body green compact, pressing pressure is greater than 400MPa;
4) sintered in temperature 1000 DEG C ~ 1350 DEG C by bearing green compact, the time of sintering is 5 ~ 180 minutes;
5) anneal in non-oxidizing atmosphere, annealing temperature is 750 ~ 1080 DEG C, the annealing in 5 ~ 200 minutes of annealing temperature retention time, and for after sintering, hardness is lower than the bearing of HRB100, and annealing operation can be alternatively;
6) extrude: the press of being reequiped by single lead screw ex truding briquetting machine or sizing rolling machine extrudes, and its maximum extrusion deformation degree is more than or equal to 2% diametrically, and extrusion die former and plug are at least divided into guide section and sizing section two parts;
7) according to accessory size requirement, processing end face and internal diameter, and carry out steam treatment to after processing according to part requirements; The temperature of steam treatment is 550 ~ 570 DEG C, is incubated 70 ~ 90 minutes.
2. manufacture method according to claim 1, is characterized in that described step 1) in lubricant and graphite adopt bonding processing mode to add.
3. manufacture method according to claim 1, is characterized in that described step 2) boss quantity be 1 ~ 20, the width of boss with highly can be identical, also can be different.
4. manufacture method according to claim 3, is characterized in that described boss is 3 ~ 4, for ears type cylinder body and monaural type cylinder body, the lug of cylinder body is respectively equipped with a boss.
5. manufacture method according to claim 1, is characterized in that described step 3) compacting be adopt warm-pressing formation or mold heated to be shaped.
6. manufacture method according to claim 1, is characterized in that described step 4) sintering carry out in vacuum sintering furnace or based on nitrogen, the ratio of hydrogen is carry out in the sintering furnace of 1 ~ 90vol%.
7. manufacture method according to claim 1, is characterized in that described step 5) annealing, the cooling velocity from annealing temperature to 300 DEG C is less than 2 DEG C/S.
8. manufacture method according to claim 1, it is characterized in that described step 4), step 5) sintering and annealing two procedures can unite two into one, temperature is controlled to be incubated in annealing temperature after sintering terminates, drop to room temperature according to the time of annealing with cooling requirement.
9. manufacture method according to claim 1, is characterized in that described step 6) extruding centre bore and other holes can be selected as extruded object, compression tool is plug, and its extrusion deformation degree is more than or equal to 2% in diametric(al), namely (in Φ extrusionin-Φ sintered partin)/Φ sintered part× 100%>=2%, for endoporus or the not rounded endoporus of band keyway, can adopt non-homogeneous extruding, then its maximum extrusion deformation degree is more than or equal to 2%, namely (in Φ diametrically extrusion-Φ 1 sintered partin)/Φ sintered partin × 100%>=2%, Φ sintered partfor the internal diameter of sintered state, in Φ extrusionfor the internal diameter of As-extruded.
10. manufacture method according to claim 1, is characterized in that described step 7) the temperature of steam treatment be 560 DEG C, be incubated 80 minutes.
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