CN106041094B - A kind of automobile engine camshaft toothed wheel wheel hub and its method for preparing powder metallurgy - Google Patents

A kind of automobile engine camshaft toothed wheel wheel hub and its method for preparing powder metallurgy Download PDF

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Publication number
CN106041094B
CN106041094B CN201610527174.2A CN201610527174A CN106041094B CN 106041094 B CN106041094 B CN 106041094B CN 201610527174 A CN201610527174 A CN 201610527174A CN 106041094 B CN106041094 B CN 106041094B
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Prior art keywords
swaging
shaping
punching
wheel hub
toothed wheel
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CN106041094A (en
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杨传芳
王士平
杜敬
袁聪
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Maanshan huadong powder metallurgy factory
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Maanshan huadong powder metallurgy factory
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    • 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
    • B22F5/00Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/08Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
    • 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
    • B22F3/03Press-moulding apparatus therefor
    • 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
    • B22F3/1003Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007Atmosphere
    • 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
    • B22F3/12Both compacting and sintering
    • B22F3/16Both compacting and sintering in successive or repeated steps
    • B22F3/162Machining, working after consolidation
    • 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
    • C22C33/0264Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10Oxidising
    • C23C8/16Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
    • C23C8/18Oxidising of ferrous surfaces
    • 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
    • B22F2998/00Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10Processes characterised by the sequence of their steps
    • 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
    • B22F2999/00Aspects linked to processes or compositions used in powder metallurgy

Abstract

The invention discloses a kind of automobile engine camshaft toothed wheel wheel hubs and its method for preparing powder metallurgy.This method sequentially includes the following steps: step S101, ingredient;Step S102, compression moulding;Step S103, blank is sintered;Step S104, finishing and processing;Step S105, steam treatment;Step S106, detection packaging.Method linking of the invention is orderly, process is few, stock utilization reaches 95% or more, the camshaft toothed wheel wheel hub amount of machining obtained by this method is few, the high consistency of class's yield is good, while meeting product performance requirements, cost of goods manufactured is made to reduce 50%.

Description

A kind of automobile engine camshaft toothed wheel wheel hub and its method for preparing powder metallurgy
Technical field
The invention belongs to powder metallurgy preparation technology field more particularly to a kind of automobile engine camshaft toothed wheel wheels Hub and its method for preparing powder metallurgy.
Background technique
Camshaft toothed wheel wheel hub 10 is a mounted in the diesel oil passenger vehicle engine tooth for reaching the requirement of Europe IV discharge standard Product on shape camshaft is used to fixed conveyor gear, and dimensional accuracy and each position Geometrical Tolerance Principle are all very high.Such as Fig. 1, figure Shown in 2, which is the profiled holes with square key platform, and shape is two pin key holes of band and three threaded holes Semicircle dog, upper surface have first rotary table, lower end surface with one containing there are three half slot the second rotary table, cam The inner hole and camshaft of axis toothed wheel wheel hub are press-fitted, it is desirable that precision reaches H8 grades, and the second rotary table and gear are press-fitted, it is desirable that outer diameter essence Degree reaches f8 grades, and concentricity requirement≤0.04mm of the second rotary table and inner hole, one of pin key hole is in specific segment length's insied width Tolerance is 0.015mm, and three threaded holes are mounting-positioning holes, and center distance tolerance requires to reach ± 0.1mm, the first round table surface and under End face is because requiring have certain friction to drive between mating plate when Product Assembly operates, therefore the first round table surface b and lower end surface a Surface roughness requirements reach Rz20-40, depth of parallelism requirement≤0.04mm, verticality requirement≤0.03mm with inner hole.Mesh Before, which is produced using the mach mode of cast form, and blank amount of machining is big, leads to material Utilization rate is only 50%, and the production cost increases, in addition, mach Product Precision is low, the consistency of product is poor, production efficiency Low, qualification rate substantially reduces.
Summary of the invention
In order to overcome the drawbacks of the prior art, the object of the present invention is to provide a kind of automobile engine camshaft toothed wheels The method for preparing powder metallurgy of wheel hub improves stock utilization, improves the precision of product, guarantees the consistency of product, improves life Efficiency is produced, while meeting product performance requirements, reduces cost of goods manufactured.
In order to realize above-mentioned goal of the invention, the invention adopts the following technical scheme:
A kind of method for preparing powder metallurgy of automobile engine camshaft toothed wheel wheel hub, according to the following steps specifically into Row:
Step S101, ingredient: camshaft toothed wheel wheel hub each component is by weight ratio are as follows: iron 92-96%, molybdenum 1-2%, nickel 1.5-3%, graphite 0.5-0.8%, lubricant 0.3-0.5%, flow velocity reinforcing agent 0.1-0.3%, metallurgical cutting agent 0.2- 0.4%, other≤1%, it is 100% that weight ratio, which weighs, and wherein molybdenum, nickel and Tie Tong cross prealloy mode and be added, so that it is closed Sufficiently, then aurification uniformly mixes 40-50min in biconial batch mixer with the other ingredients weighed by said ratio, make each Ingredient is uniformly mixed, the appropriate proportion of molybdenum, nickel and graphite, can effectively control the sintered dimensions variation of product, while improving production The sintering strength of product;
Step S102, it compression moulding: by above-mentioned uniformly mixed powder, is packed into and presses camshaft toothed wheel wheel hub structure feature In the compacting tool set of design, on 300T mechanical press, with 4.5-5.5T/cm2Compression moulding of pressure, green density are 6.8-6.9g/cm3
Step S103, blank is sintered: green compact being lain on the smooth ceramic backing of sintering, 10- is reserved between green compact The gap of 20mm is sintered 40min effectively to control the sintering warpage amount of green compact in net belt type sintering furnace, is sintered protective atmosphere For nitrogen and hydrogen mixture, nitrogen hydrogen ratio is 90:10, and sintering temperature is 1120 DEG C;
Step S104, it finishing and processing: on 160T trimmer, is put after the blank sintered is coated finishing lubricating oil Enter in finishing mold, carries out full finishing, drilling machine is used to carry out tapping after finishing;
Step S105, steam treatment: above-mentioned tapped blank is put into well formula steam treatment furnace, by certain technique Oxide treatments are carried out, to improve product surface hardness and anti-corrosion ability, product surface hardness reaches HRB80-100, table Face is in uniformly glossiness black-and-blue;
Step S106, detection packaging: the good finished product of steam oxidation blackening process is inspected by random samples by product testing standard, Qualified through detection, it carries out being packaged into product library by product packaging requirement.
Further, in step s101, the lubricant model SKZ800 lubricant, flow velocity reinforcing agent model LS-690 flow velocity reinforcing agent, metallurgical cutting agent model SM-8 metallurgy cutting agent.
Further, in step s 102, the compacting tool set includes a punching in swaging, two punchings, technique core in swaging A punching, swaging following two punch and shoulder core under stick, support spring, swaging die cavity, swaging, support spring is against built in technique plug It is set in two punchings in two punching in swaging, swaging and a punching in swaging;Shoulder core is built in swaging following two punch, swaging following two punch with A punching suit under swaging, when compression moulding, to guarantee product band, there are three the second rotary tables of half slot can certain density, work Two rush 9-10mm in skill plug stretching swaging, adjust a punching in swaging and rush more stretching 9-10mm than in swaging two, when in swaging one Form dress powder chamber when rushing in swaging die cavity and in swaging between two punchings, technique plug blocks in swaging two and rushes inner hole, makes powder It will not flow away from its inner hole, guarantee certain filling amount, adjust the dress powder and shaping position of a punching and swaging following two punch under swaging, To guarantee the density and depth dimensions of product large end face and the first rotary table, appropriate adjustment shoulder core amount of floating, to guarantee inner hole The density and depth dimensions of fang platform.
Further, in step S104, the shaping mould includes a punching in shaping, two punchings in shaping, in shaping A punching, shaping following two punch and shaping core rod under mould, shaping, two punchings are set with a punching in shaping in shaping, and shaping core rod is built in A punching is set under shaping following two punch, shaping following two punch and shaping, and using press cushion block precise positioning, each step of product is effectively ensured Size and the depth of parallelism and planarity requirements, for the face of the special roughness requirements of product, two punchings and next punching in corresponding shaping Face zone position get corresponding rough surface with electrode by roughness requirements, in shaping by adjusting shaping pressure appropriate and Height shaper amount makes obverse roughness reach product drawing requirement.
Further, in step s 102, when shoulder core is encountered when the intensity of the support spring need to meet forming When technique plug, technique plug can retract and guarantee not with shoulder core even at the cost of one's life, again can be work when a refunds journey demoulds in swaging Skill plug bounces back into dress powder position.
Further, in step S104, the finishing is DHO finishing oil with lubricating oil, be kinematic viscosity 68#, Moderate hydrogenation technique oil, can effectively reduce shaping resistance and protection product and shaping mould will not pull, and can guarantee simultaneously Surface corrosion does not occur in product circular flow.
Further, in step s105, the technique are as follows: in well formula steam treatment furnace: (1) lead to nitrogen exhaust and remove Oil, 300 DEG C of heat preservation 2h;(2) heating and water flowing steam, 500 ± 10 DEG C of heat preservation 3h;(3) heating and water flowing steam, 570 ± 10 DEG C 2h is kept the temperature, (4) come out of the stove air-cooled.
It is a further object of the present invention to provide a kind of by the powder smelting of camshaft toothed wheel wheel hub of above-mentioned automobile engine The product that golden preparation method obtains.
Compared with prior art, beneficial effect is:
1) orderly, process is few, stock utilization reaches 95% or more, is obtained by this method convex for method of the invention linking Wheel shaft toothed wheel wheel hub amount of machining is few, the high consistency of class's yield is good, while meeting product performance requirements, makes product Manufacturing cost reduces 50%;
2) mobility and formability of powder can be improved using flow velocity reinforcing agent and super lubricant by the present invention, make powder It can effectively and uniformly be filled in mold, to guarantee each position even density of product, reduce its sintering warpage amount, effectively controlled The geometric tolerance of product;The addition of metallurgical cutting agent can be effectively improved its machinability, so that product is made to be easy to tapping, Improve the efficiency and quality of its tapping;
3) present invention gets the rough surface of two punchings and a punching under shaping in corresponding shaping using electrode, is reached using shaping To product corresponding surface roughness requirements, with electrical discharge machining rough surface low efficiency, at high cost, equipment investment before efficiently solving The problems such as high, product size precision, geometric tolerance and surface roughness meet requirement;
4) present invention ensure that product band using the one technique plug of spring supporting in swaging in two punchings with setting intensity There are three the second rotary tables of half slot can reach density requirements.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1 is the structural schematic diagram of prior art camshaft toothed wheel wheel hub;
Fig. 2 is the structural schematic diagram of prior art camshaft toothed wheel wheel hub;
Fig. 3 is compacting tool set and assembling product fit structure schematic diagram of the present invention;
Fig. 4 is the cross-sectional view of Fig. 3;
Fig. 5 is finishing mold and assembling product fit structure schematic diagram of the present invention;
Fig. 6 is the cross-sectional view of Fig. 5;
Fig. 7 is the structural schematic diagram of two punchings in shaping of the present invention;
Fig. 8 is the structural schematic diagram of a punching under shaping of the present invention.
Specific embodiment
Below just by embodiment that this is provided come the powder to automobile engine camshaft toothed wheel wheel hub of the present invention Last metallurgical preparation method illustrates.
A kind of method for preparing powder metallurgy of 1 automobile engine camshaft toothed wheel wheel hub of embodiment, according to the following steps It is specific to carry out:
Step S101, by weight ratio according to camshaft toothed wheel wheel hub each component are as follows: iron 92-96%, molybdenum 1-2%, nickel 1.5-3%, graphite 0.5-0.8%, SKZ800 lubricant 0.3-0.5%, LS-690 flow velocity reinforcing agent 0.1-0.3%, SM-8 smelting Golden cutting agent 0.2-0.4%, it is other≤1%, weight ratio weigh be 100%, wherein molybdenum, nickel and Tie Tong cross prealloy mode and add Enter, so that sufficiently, then its alloying uniformly mixes 40- in biconial batch mixer with the other ingredients weighed by said ratio 50min is uniformly mixed each ingredient, the appropriate proportion of molybdenum, nickel and graphite, can effectively control the sintered dimensions variation of product, The sintering strength of product is improved simultaneously;
Step S102, by above-mentioned uniformly mixed powder, it is packed into the pressure for pressing camshaft toothed wheel wheel hub structure characteristic Design In molding jig, on 300T mechanical press, with 4.5-5.5T/cm2Compression moulding of pressure, green density 6.8-6.9g/ cm3;The compacting tool set includes a punching 13 in swaging, two punching 11, technique plug 14, support spring 12, pressure-shaped mould in swaging A punching 16, swaging following two punch 17 and shoulder core 18, support spring are built in two in swaging against technique plug under chamber 15, swaging It rushes, two punchings are set with a punching in swaging in swaging;Shoulder core is built in swaging following two punch, a punching under swaging following two punch and swaging Suit, when compression moulding, to guarantee product band, there are three the second rotary tables of half slot can certain density, and technique plug stretches out Two rush 9-10mm in swaging, adjust a punching in swaging and rush more stretching 9-10mm than in swaging two, when one rushes in into swaging in swaging Form dress powder chamber when die cavity and in swaging between two punchings, technique plug blocks in swaging two and rushes inner hole, makes powder will not be out of it Hole flows away, and guarantees certain filling amount;When shoulder core encounters technique core when the intensity of the support spring need to meet forming When stick, technique plug can retract and guarantee not with shoulder core even at the cost of one's life, again can be technique plug when a refunds journey demoulds in swaging Bounce back into dress powder position;Adjust swaging under one punching and swaging following two punch dress powder and shaping position, with guarantee product large end face and The density and depth dimensions of first rotary table, appropriate adjustment shoulder core amount of floating, to guarantee the density and depthometer of inner hole fang platform It is very little.
Step S103, green compact is lain on the smooth ceramic backing of sintering, the sky of 10-20mm is reserved between green compact Gap is sintered 40min effectively to control the sintering warpage amount of green compact in net belt type sintering furnace, and it is mixed for nitrogen hydrogen to be sintered protective atmosphere Gas is closed, nitrogen hydrogen ratio is 90:10, and sintering temperature is 1120 DEG C;
Step S104, on 160T trimmer, finishing mold is put into after the blank sintered is coated finishing lubricating oil In, full finishing is carried out, drilling machine is used to carry out tapping after finishing;The shaping mould includes a punching 22 in shaping, in shaping Two punchings 21, a punching 24, shaping following two punch 25 and shaping core rod 26 under mould 23, shaping in shaping, two punchings and in shaping one in shaping Punching suit, shaping core rod are built in shaping following two punch, and a punching is set under shaping following two punch and shaping, precisely fixed using press cushion block Position, is effectively ensured each step dimension of product 10 and the depth of parallelism and planarity requirements, for the face of the special roughness requirements of product, The face zone position of a punching gets corresponding rough surface with electrode by coarse requirement under a punching and shaping in corresponding shaping, in shaping By adjusting shaping pressure appropriate and height shaper amount, obverse roughness is made to reach product drawing requirement;The essence Whole with lubricating oil is DHO finishing oil, be kinematic viscosity 68#, moderate hydrogenation technique it is oily, shaping resistance can be effectively reduced simultaneously Protection product and shaping mould will not be pulled, while can guarantee in product circular flow and surface corrosion does not occur;
Step S105, it by above-mentioned tapped blank, is put into well formula steam treatment furnace, is carried out at oxidizing blackening by technique Reason, to improve product surface hardness and anti-corrosion ability, product surface hardness reaches HRB80-100, and surface is in uniformly glossy It is black-and-blue;The wherein technique are as follows: in well formula steam treatment furnace: (1) lead to nitrogen and be vented oil removing, 300 DEG C of heat preservation 2h; (2) heating and water flowing steam, 500 ± 10 DEG C of heat preservation 3h;(3) heating and water flowing steam, 570 ± 10 DEG C of heat preservation 2h, (4) are come out of the stove sky It is cold;
Step S106, steam oxidation blackening process is good finished product, is inspected by random samples by product testing standard, qualified through detection , it carries out being packaged into product library by product packaging requirement.
Camshaft toothed wheel wheel hub each component parameter by weight ratio is listed in Table 1 below, the camshaft tooth which obtains Shape wheel wheel hub, detects its performance, performance parameter is listed in Table 2 below.
Embodiment 2 is handled with 1 method of embodiment, and camshaft toothed wheel wheel hub each component parameter by weight ratio is listed in In table 1, the camshaft toothed wheel wheel hub which obtains is detected its performance, performance parameter is listed in Table 2 below.
Embodiment 3 is handled with 1 method of embodiment, and camshaft toothed wheel wheel hub each component parameter by weight ratio is listed in In table 1, the camshaft toothed wheel wheel hub which obtains is detected its performance, performance parameter is listed in Table 2 below.
Embodiment 4 is handled with 1 method of embodiment, and camshaft toothed wheel wheel hub each component parameter by weight ratio is listed in In table 1, the camshaft toothed wheel wheel hub which obtains is detected its performance, performance parameter is listed in Table 2 below.
Embodiment 5 is handled with 1 method of embodiment, and camshaft toothed wheel wheel hub each component parameter by weight ratio is listed in In table 1, the camshaft toothed wheel wheel hub which obtains is detected its performance, performance parameter is listed in Table 2 below.
1 embodiment camshaft toothed wheel wheel hub each component of table parameter by weight ratio
Component/% Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5
Iron 93.87 93.58 93.86 93.95 93.53
Molybdenum 1.45 1.51 1.48 1.55 1.58
Nickel 2.2 2.34 2.15 1.98 2.26
Graphite 0.65 0.72 0.7 0.68 0.75
Super lubricant 0.42 0.45 0.41 0.39 0.4
Flow velocity reinforcing agent 0.22 0.21 0.2 0.18 0.25
Metallurgical cutting agent 0.31 0.29 0.33 0.35 0.28
Other 0.88 0.9 0.87 0.92 0.95
2 performance parameter of table
By the data in table 2 it is known that the camshaft toothed wheel wheel hub obtained by each embodiment, the first round table surface b Roughness reaches 28 or more, and lower end surface a roughness reaches 27 or more, and meet the requirements defined Rz20-40;First round table surface b With the lower end surface a depth of parallelism≤verticality of 0.04mm, the first round table surface b and lower end surface a and inner hole≤0.03mm, product table Surface hardness reaches HRB80 or more, fully meets the requirement of camshaft toothed wheel wheel hub service performance.

Claims (8)

1. a kind of automobile engine method for preparing powder metallurgy of camshaft toothed wheel wheel hub, which is characterized in that press following step Rapid specific progress:
Step S101, ingredient: by weight ratio according to camshaft toothed wheel wheel hub each component are as follows: iron 92-96%, molybdenum 1-2%, nickel 1.5-3%, graphite 0.5-0.8%, lubricant 0.3-0.5%, flow velocity reinforcing agent 0.1-0.3%, metallurgical cutting agent 0.2- 0.4%, other≤1%, it is 100% that weight ratio, which weighs, and wherein molybdenum, nickel and Tie Tong cross prealloy mode and be added, so that it is closed Sufficiently, then aurification uniformly mixes 40-50min in biconial batch mixer with the other ingredients weighed by said ratio;
Step S102, it compression moulding: by above-mentioned uniformly mixed powder, is packed into and presses camshaft toothed wheel wheel hub structure characteristic Design Compacting tool set in, on 300T mechanical press, with 4.5-5.5T/cm2Compression moulding of pressure, green density 6.8- 6.9g/cm3
Step S103, blank is sintered: green compact being lain on the smooth ceramic backing of sintering, 10-20mm is reserved between green compact Gap be sintered 40min in net belt type sintering furnace effectively to control the sintering warpage amount of green compact, sintering protective atmosphere is nitrogen Hydrogen gaseous mixture, nitrogen hydrogen ratio are 90:10, and sintering temperature is 1120 DEG C;
Step S104, finishing and processing: on 160T trimmer, essence is put into after the blank sintered is coated finishing lubricating oil In reshaping die, full finishing is carried out, drilling machine is used to carry out tapping after finishing;
Step S105, steam treatment: above-mentioned tapped blank is put into well formula steam treatment furnace, is carried out by certain technique Oxide treatments, to improve product surface hardness and anti-corrosion ability, product surface hardness reaches HRB80-100, and surface is in It is uniformly glossiness black-and-blue;
Step S106, steam oxidation blackening process is good finished product, is inspected by random samples by product testing standard, qualified through detection, It carries out being packaged into product library by product packaging requirement.
2. the automobile engine according to claim 1 method for preparing powder metallurgy of camshaft toothed wheel wheel hub, special Sign is, in step s101, the lubricant model SKZ800 lubricant, flow velocity reinforcing agent model LS-690 flow velocity Reinforcing agent, metallurgical cutting agent model SM-8 metallurgy cutting agent.
3. the automobile engine according to claim 1 method for preparing powder metallurgy of camshaft toothed wheel wheel hub, special Sign is that in step s 102, the compacting tool set includes a punching (13) in swaging, two punching (11), technique plug in swaging (14), a punching (16), swaging following two punch (17) and shoulder core (18), branch under support spring (12), swaging die cavity (15), swaging Support spring is built in two punching in swaging against technique plug, and two punchings are set with a punching in swaging in swaging;Shoulder core is built in Swaging following two punch, a punching is set under swaging following two punch and swaging, and when compression moulding, technique plug stretches out in swaging two and rushes 9- 10mm, adjust swaging on one punching more stretching 9-10mm are rushed than in swaging two, when in swaging one rush in into swaging die cavity when and swaging Dress powder chamber is formed between upper two punching, technique plug blocks in swaging two and rushes inner hole.
4. the automobile engine according to claim 1 method for preparing powder metallurgy of camshaft toothed wheel wheel hub, special Sign is, in step S104, the shaping mould includes a punching (22) in shaping, two punchings (21) in shaping, mould in shaping (23), a punching (24), shaping following two punch (25) and shaping core rod (26) under shaping, two punchings and a punching suit in shaping in shaping, Shaping core rod is built in shaping following two punch, and a punching is set under shaping following two punch and shaping, in corresponding shaping under a punching and shaping The face zone position of one punching gets corresponding rough surface with electrode by coarse requirement, in shaping by adjusting shaping pressure appropriate And height shaper amount, so that obverse roughness is reached product drawing requirement.
5. the automobile engine according to claim 3 method for preparing powder metallurgy of camshaft toothed wheel wheel hub, special Sign is, in step s 102, when shoulder core (18) encounter work when the intensity of the support spring (12) need to meet forming When skill plug (14), technique plug can retract and guarantee not with shoulder core even at the cost of one's life, in swaging when punching (11) backhaul demoulding again Technique plug can be bounce back into dress powder position.
6. the automobile engine according to claim 1 method for preparing powder metallurgy of camshaft toothed wheel wheel hub, special Sign is, in step S104, the finishing is DHO finishing oil with lubricating oil, adds hydrogen work for kinematic viscosity 68#, moderate Skill oil.
7. the automobile engine according to claim 1 method for preparing powder metallurgy of camshaft toothed wheel wheel hub, special Sign is, in step s105, the technique are as follows: in well formula steam treatment furnace: (1) leads to nitrogen and is vented oil removing, 300 DEG C of guarantors Warm 2h;(2) heating and water flowing steam, 500 ± 10 DEG C of heat preservation 3h;(3) heating and water flowing steam, 570 ± 10 DEG C of heat preservation 2h, (4) It comes out of the stove air-cooled.
8. a kind of powder metallurgy preparation side by claim 1 to 7 any automobile engine camshaft toothed wheel wheel hub The product that method obtains.
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CN110947952B (en) * 2019-12-17 2022-02-11 马鞍山市华东粉末冶金厂 Transmission eccentric block for light electric pruning shears and manufacturing method thereof
CN112296331A (en) * 2020-10-30 2021-02-02 马鞍山市华东粉末冶金厂 Phase signal wheel for automobile engine and powder metallurgy manufacturing method

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