CN104498749B - A kind of manufacture craft of Wimet - Google Patents
A kind of manufacture craft of Wimet Download PDFInfo
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- CN104498749B CN104498749B CN201410773586.5A CN201410773586A CN104498749B CN 104498749 B CN104498749 B CN 104498749B CN 201410773586 A CN201410773586 A CN 201410773586A CN 104498749 B CN104498749 B CN 104498749B
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Abstract
The invention discloses a kind of manufacture craft of Wimet, belong to the production technical field of producing Wimet.The manufacture craft of a kind of Wimet of the present invention, by the step of the pre-treatment → stacked → sintering of batching → ball mill mixing → dry → wiping sieve → punching press → graphite planar boat, the use of the retrieving arrangement of each step, the use of tailor-(made) coating, the use of the dull and stereotyped boat of high purity graphite, the use of the sintering vacuum-temperature process curve set, ensure that stability and the qualification rate of hart metal product quality, achieve the object improving hart metal product quality, whole technique had both ensured the personnel safety of operative employee and had avoided environmental pollution, more than 50% can be enhanced productivity again, for identical production capacity, facility investment can be reduced, the recovery comprehensive utilization device of each step, can save the energy, lowers production cost, enhances one's market competitiveness.
Description
Technical field
The invention belongs to the production technical field of producing Wimet, be specifically related to a kind of manufacture craft of Wimet.
Background technology
Wimet introduces China from the sixties in last century, and current China has become the first in the world CEMENTED CARBIDE PRODUCTION and consumption big country.Hard metal article has the excellent use properties equaling to diamond, brings more high-quality and convenience, be deep into the every aspect of people's life to the life of people.Present Wimet demand is increasing, but CEMENTED CARBIDE PRODUCTION flow process is relatively complicated, and with high content of technology, production cost is high.Reducing production cost, improving the quality of products is the key improving the Wimet market competitiveness.The each procedure of CEMENTED CARBIDE PRODUCTION requires high especially; such as sintering must be sintered to 1400 ~ 1500 DEG C under protective atmosphere; must produce in special airtight sintering oven, and during hart metal product sintering, blank must be placed on the resistant to elevated temperatures graphite boat of a kind of energy of energy.Therefore, hart metal product quality ensures by the way such as equipment, production technique completely.People have dropped into a lot of manpower and materials to equipment and production technique and have studied and improve, and achieve the achievement much allowing people pleasantly surprised.The equipment and process production that same Hardmetal materials is advanced, work-ing life can improve about 50%.But the research of people to graphite boat does not attract great attention, in fact the material of graphite boat and shape also have a great impact Wimet quality, prior Wimet demand increases, prior art increase yield must increase sintering oven, and sintering oven least significant end also want hundreds of thousands of, high-end is up to ten million, and investment of production is large.In fact also can try every possible means in shape from boat, increase and utilize space, same equipment can effective increase yield, and minimizing facility investment, reduces costs.Graphite material kind is also a lot, the furnace atmosphere that impurity is high when can affect sintering, and then affects alloy product quality, and the low graphite of intensity natively can affect work-ing life.
Chinese Patent Application No.: 201310747611.8, publication date: 2014-4-2 patent document discloses a kind of hard alloy production process.This invention relates to a kind of hard alloy production process, the method for the recycling of the broken end material particularly produced in Wimet extrusion process.Concrete technology step comprises: prepared by (1) compound: batching → ball milling → drying → homogenizing is broken, obtains powder; (2) compound is extruded: mixing granulation → extruding → natural air drying → heat drying → processing cutting, obtains work in-process; (3) sinter; (4) finished product inspection packaging warehouse-in.Mainly produce broken end material in step (2), by it through homogenizing break process, then add how to hide mixing granulation from, then through subsequent steps such as extruding, the technical process of broken end material process is optimized in this invention while guaranteeing product performance, significantly reduces costs.This invention is not to the step that carrier graphite planar boat processes, because high temperature sintering can affect the composition volatilization of Wimet quality in graphite planar boat, and the graphite planar boat of not brushing through tailor-(made) coating can by the Wimet adhesion after sintering, be not easy discharging, force discharging to cause and damage graphite planar boat and finished product Wimet, therefore, there is certain technological deficiency in this invention.
Summary of the invention
1. the technical problem that will solve
Higher for the production cost of sintered hard alloy in prior art, quality product is not easy to control, and existing graphite planar boat affects the problem of quality of finished, the invention provides a kind of manufacture craft of Wimet.The dull and stereotyped pre-treatment of boat of this technology utilization process optimization, byproduct synthetical recovery, high purity graphite and the use of use and tailor-(made) coating achieve and reduce production cost and improve hart metal product quality, and reduce the object of dust to harm and environmental pollution.
2. technical scheme
For achieving the above object, contriver, through the Continuous Tracking of time for many years and summary, sums up technical scheme of the present invention:
A manufacture craft for Wimet, the steps include:
Step one, batching: by the various powders of Wimet by formulated;
Step 2, ball mill mix:
A, in ball mill, add the powder that alcohol, forming agent and step one prepare by weight ratio;
B, start ball mill, in ball mill bat effect under, polish and be mixed into slip;
Step 3, drying: proceeded to by slip in vacuum drying oven and carry out drying, in irregular particle shape after dry;
Step 4, wiping sieve: be Powdered after dried granular material being carried out wiping sieve;
Step 5, punching press: powder material is pressed product weight and the impact briquetting of specification requirement oil pressure stamping machine in the form of sheets;
The pre-treatment of step 6, graphite planar boat:
A, graphite planar boat surface Graphite Powder 99 to be rooted out in dedicated processes case;
B, in vacuum oven, be warmed up to 1500 DEG C of calcinings, be incubated 3 ~ 5 hours;
C, cooling: the graphite planar boat after sintering soak is cooled to room temperature;
D, swabbing: at surface brush one deck tailor-(made) coating of graphite planar boat;
Step 7, stacked: the upper surface sheet material after step 5 punching press being put into the graphite planar boat that step 6 is handled well, then layering superposition, uses cushion block interlayer between every layer;
Step 8, sintering, proceed to stacked good material in vacuum-sintering integral furnace and sinter;
A, to sinter by the sintering vacuum-temperature process curve set;
B, to come out of the stove, after having sintered, come out of the stove, produce hard alloy finished product warehouse-in;
Wherein, after the wiping sieve described in step 4, powder material is 60 ~ 180 orders; Graphite planar boat described in step 6 and the cushion block described in step 7 are made by the high purity graphite of two leaching three roastings, and density is greater than 1.8 tons/cubic metre; Described graphite planar boat planeness is less than 0.1mm, thickness is 5 ~ 7mm, shape is square or circular.
Preferably, the sheet material after the cushion block described in step 7 and step 5 punching press is contour, and cushion block keeps point-blank up and down.
Preferably, described cushion block waste and old graphite planar boat or scrap stock make, and represent different height by different shapes, length and width is monolateral is not less than 5mm, is not more than 20mm.
Preferably, the dedicated processes case described in step 6 is showering recycling graphite device.
Preferably, the alcohol purity described in step 2 is greater than 98%, forming agent is No. 58 paraffin.
Preferably, the tailor-(made) coating described in step 6 comprises PEG4000 (molecular weight is the polyoxyethylene glycol of 4000), aquadag, high abrasion carbon black, tween 80, ultra-fine alumina and pure water.
Preferably, described tailor-(made) coating weight part is separately: PEG400010 ~ 20; Aquadag 10 ~ 20; High abrasion carbon black 10 ~ 20; Ultra-fine alumina 5 ~ 10; Tween 80 accounts for 5-10; Pure water 30 ~ 50, making processes is: be first dissolved in pure water by PEG4000, then other component is added to successively in PEG4000 lysate and is uniformly mixed.
Preferably, described vacuum-temperature process curve is following steps:
A, negative pressure dewax, intensification slope 10 ~ 15 DEG C/min of 0 DEG C ~ 150 DEG C, and 10 ~ 15 minutes used times, vacuum degree control is within 50Pa;
B, negative pressure dewax, intensification slope 5 ~ 10 DEG C/min of 150 DEG C ~ 200 DEG C, and 5 ~ 10 minutes used times, vacuum degree control is within 200Pa;
C, negative pressure dewax, intensification slope 3 ~ 6 DEG C/min of 200 DEG C ~ 260 DEG C, and 10 ~ 20 minutes used times, vacuum degree control is within 800Pa;
D, negative pressure dewax, intensification slope 0.3 ~ 1 DEG C/min of 260 DEG C ~ 320 DEG C, and 60 ~ 200 minutes used times, vacuum degree control is within 800Pa;
E, negative pressure dewax, intensification slope 0.2 ~ 0.5 DEG C/min of 320 DEG C ~ 360 DEG C, and 80 ~ 200 minutes used times, vacuum degree control is within 800Pa;
F, negative pressure dewax, intensification slope 0.5 ~ 1 DEG C/min of 360 DEG C ~ 450 DEG C, and 90 ~ 180 minutes used times, vacuum degree control is within 500Pa;
G, negative pressure dewax, intensification slope 3 ~ 5 DEG C/min of 450 DEG C ~ 600 DEG C, and 30 ~ 50 minutes used times, vacuum degree control is within 300Pa;
H, vacuum sintering, intensification slope 5 ~ 8 DEG C/min of 600 DEG C ~ 1150 DEG C, 70 ~ 110 minutes used times, vacuum degree control is within 200Pa;
I, vacuum sintering, intensification slope 1 ~ 2 DEG C/min of 1150 DEG C ~ 1280 DEG C, 65 ~ 130 minutes used times, vacuum degree control is within 50Pa;
J, vacuum sintering, intensification slope 2.5 ~ 3.5 DEG C/min of 1280 DEG C ~ 1350 DEG C, 20 ~ 28 minutes used times, vacuum degree control is within 50Pa;
K, dividing potential drop sinter, 1350 DEG C of intensification slope 3 ~ 4 DEG C/min to outlet temperature, and vacuum degree control is within 500Pa;
L, dividing potential drop sinter, outlet temperature insulation 50 ~ 90 minutes, and vacuum degree control is within 500Pa;
M, cool fast, when naturally cooling to 1000 DEG C, applying argon gas cools fast;
N, to come out of the stove, be cooled to less than 80 DEG C blow-on doors to come out of the stove.
Preferably, the carrier gas of the steps A ~ G step of described vacuum-temperature process curve is argon gas, and is provided with solvent recovery with paraffin system; Described argon flow amount is 0.5 ~ 1.2L/min; Described solvent recovery with paraffin system comprises condensing works and the two-stage in body of heater outside receives wax apparatus, wherein: condensing works and two-stage are received wax apparatus and passed through pipeline communication; The vacuum degree control of described C, D, E step is at 300Pa ~ 800Pa; The vacuum degree control of described F step is at 300Pa ~ 500Pa; The vacuum degree control of described G step is at 100Pa ~ 300Pa.
Preferably, alcohol recovery device is provided with in the drying process of described step 3.
3. beneficial effect
Adopt technical scheme provided by the invention, compared with existing known technology, there is following unusual effect:
(1) manufacture craft of a kind of Wimet of the present invention, the step of the pre-treatment of graphite planar boat, 1500 DEG C of calcinings are warmed up in vacuum oven, be incubated 3 ~ 5 hours, the impurity component such as iron, copper, the aluminium volatilization of Wimet quality will can be affected on the one hand in graphite planar boat, on the other hand after tailor-(made) coating is brushed, after sintering, Wimet easily plays material, root out in dedicated processes case, both Graphite Powder 99 can be reclaimed, and graphite dust can be avoided again to work the mischief to human body and to environment, the dull and stereotyped boat of high purity graphite due to hardness high, planeness is little, and (planeness is less than 0.1mm, circular boat working face planeness is difficult to reach), the problem of carburizing and decarburization can not be out of shape and occur after hart metal product sintering, than the common graphite of prior art, foreign matter content is few, and intensity is high, the quality of alloy and the work-ing life of boat all beneficial, the stability of hart metal product quality is carried out sintering and can ensureing by the sintering vacuum-temperature process curve set, the work box of sintering cemented carbide stove is rectangular, the band edge circle boat of prior art is larger than graphite planar boat horizontal space waste of the present invention, and, prior art is because there is the positioning step of 1mm bottom band edge boat, the height of band edge boat side at least also exceeds 1mm than product, causes the waste in space, band edge boat will according to the height of product and size in addition, the boat of customization different size, boat takies greatly, operation also bothers, the waste of sintering oven vertical space is large, and graphite planar boat of the present invention, except plane put the space of product much larger except, the more important thing is highly versatile, the specification of graphite planar boat is selected according to the useful space of work box in sintering oven and product specification, gauge control is at 5 ~ 7mm, compare the graphite material about round boat saving half, as long as the product that band edge plane boat can be put can be put, without the need to customizing the boat of different size, as long as make the cushion block contour with product with waste and old graphite boat etc., not only reduced boat take but also save vertical space, slug detect, cut the waste, cost-saving, the present invention's band edge boat compared to existing technology can increase single furnace output about 20%, prior art increases Wimet output will lean on increase sintering oven, and sintering oven one at least hundreds of thousands of, up to ten million at most, use the present invention, the huge investment of equipment can be reduced, save cost, improve the market competitiveness,
(2) manufacture craft of a kind of Wimet of the present invention, the sheet material after the cushion block described in step 7 and step 5 punching press is contour, and cushion block keeps point-blank up and down; Be that cushion block supports during the closed assembly stove of step 7 middle level, alloy product surrounding is unlimited, and unblocked when forming agent is discharged, forming agent gas can not stop at alloy surface, is conducive to improving the quality of products; And during the band edge boat shove charge of prior art, that limit superposes up with limit, that is hart metal product is enclosed in inside boat, when sintering gets rid of forming agent, the forming agent gas of discharging also will be drained from the pore of graphite boat, in alloy product, expellant gas can not be drained in time, is easy to the quality problems causing product carburizing or decarburization;
(3) manufacture craft of a kind of Wimet of the present invention, described cushion block waste and old graphite planar boat or scrap stock make, and reduce production cost; Represent different height by different shapes, be convenient to the classification process of product after coming out of the stove; Length and width is monolateral is not less than 5mm, is not more than 20mm, adapts to the thickness of various hard tough products; After cutting out material by specification during making, plain grinding, graphite material will be saved compared to existing technology, reduce graphite ashes to the pollution of environment, and the band edge boat of prior art will by after the specification sanction material of band edge, by the middle portion on limit, upper milling machine mills, mill out the graphite ashes come and cause waste, and environmental pollution is very large;
(4) manufacture craft of a kind of Wimet of the present invention, the dedicated processes case described in step 6 is showering recycling graphite device, effectively avoids the harm of graphite dust to human respiratory and the pollution to environment;
(5) manufacture craft of a kind of Wimet of the present invention, alcohol purity is greater than 98%, namely reaches and carries out mixed uniformly object to powder, again reduces the impact of Impurities Upon Product Quality; Forming agent is No. 58 paraffin, is better than general rubber and paraffin to the bonding of Wimet powder and molding effect;
(6) manufacture craft of a kind of Wimet of the present invention, tailor-(made) coating described in step 6 comprises PEG4000, aquadag, high abrasion carbon black, ultra-fine alumina, tween 80 and pure water, it is all common raw material, composition is simple, cost is low, and takes full advantage of the solvability of PEG4000 and fusible advantage;
(7) manufacture craft of a kind of Wimet of the present invention, with the tailor-(made) coating strong adaptability that formula and the making method of described tailor-(made) coating make, both be applicable to rubber process and be also applicable to paraffin technology, all hart metal products can be sintered, the carburizing of product, decarburization or distortion can not be caused to scrap, and the reason that effectively prevent because of coating causes hart metal product to scrap;
(8) manufacture craft of a kind of Wimet of the present invention, with described vacuum-temperature process curve, the peak curve that paraffin is got rid of in goods can be mated, and its intensification slope achieves in goods, outside meet by heat energy the object that paraffin gas at the uniform velocity discharges sequentially, so just can make goods in sintering process can not because of sintering process reason peeling, crackle, be out of shape and leave carbon residue, effectively ensure that alloy product sharply can not be discharged because of paraffin gas and caused peeling, crackle, distortion etc., stabilize quality, reduce scrap rate, provide cost savings,
(9) manufacture craft of a kind of Wimet of the present invention, solvent recovery with paraffin system effectively can reclaim paraffin, and effectively can reduce the pollution of paraffin gas to burner hearth and vacuum apparatus, and carrier gas is argon gas, the normal work of the inertia energy support equipment of argon gas and the stable of sintering furnace atmosphere; Not only ensure the quality of alloy product but also extended the work-ing life of relevant device, reduce the discount cost of equipment; The control of argon flow amount has ensured vacuum tightness and argon atmosphere in stove; Body of heater outside has two-stage to receive wax apparatus, can improve and vacuumize and paraffin removal efficiency, and improve solvent recovery with paraffin rate, the rate of recovery can reach more than 97%; The vacuum degree control of C, D, E step, taken into account de-cured in the coordination of thermophase vacuum tightness and heats, have suitable vacuum tightness and sufficient heat absorption in the effusion peak period of paraffin steam; The vacuum degree control of F and G step, has taken into account the coordination in de-cured hot stage vacuum tightness and heats, has had suitable vacuum tightness and sufficient heat absorption late period in the effusion of paraffin steam;
(10) manufacture craft of a kind of Wimet of the present invention, the alcohol recovery device of step 3, is undertaken reclaiming and reusing by dried alcohol, effectively reduces production cost;
(11) manufacture craft of a kind of Wimet of the present invention, can enhance productivity more than 50%, for identical production capacity, can reduce facility investment; The recovery comprehensive utilization device of each step, can save the energy, lowers production cost, enhances one's market competitiveness.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
The manufacture craft of a kind of Wimet of the present embodiment, the steps include:
Step one, batching: the various powders by Wimet: wolfram varbide, spherical cobalt powder and chromium carbide are by formulated;
Step 2, ball mill mix:
The powder that A, the alcohol adding 99% purity in ball mill by weight ratio, No. 58 wax moulding agent and step one prepare;
B, start ball mill, in ball mill bat effect under, polish and be mixed into slip;
Step 3, drying: slip is proceeded in vacuum drying oven and carry out drying, in irregular particle shape after dry, alcohol reclaims by the external alcohol recovery device of vacuum drying oven, recycling;
Step 4, wiping sieve: Powdered in 60 orders after dried granular material being carried out wiping sieve;
Step 5, punching press: powder material is pressed product weight and the impact briquetting of specification requirement oil pressure stamping machine in the form of sheets;
The pre-treatment of step 6, graphite planar boat: boundless dull and stereotyped boat made by the high purity graphite that graphite planar boat selects two leachings three to roast, specification is 400mm*400mm*6mm, planeness 0.08mm, shape are square, density is 1.9 tons/cubic metre, and treatment step is as follows:
A, graphite planar boat surface Graphite Powder 99 to be rooted out in showering recycling graphite device;
B, in vacuum oven, be warmed up to 1500 DEG C of calcinings, be incubated 3 hours;
C, cooling: the graphite planar boat after sintering soak is cooled to room temperature;
D, coating make: take PEG40001 kilogram, aquadag 2 kilograms, high abrasion carbon black 2 kilograms, ultra-fine alumina 1 kilogram, tween 80 is 0.5 kilogram, pure water 3 kilograms; First PEG4000 is dissolved in pure water, then other component is added in PEG4000 lysate is successively uniformly mixed;
E, swabbing: the tailor-(made) coating of step on surface brush one deck of graphite planar boat;
Step 7, stacked: to be 20 of ￠ 380mm* ￠ 200*6mm by the product specification of the sheet material after step 5 punching press, 30 of 320mm*320mm*5.0mm, 200 of 180mm*180mm*3.0mm, 100 of 150mm*150mm*2.0mm, 200 of 70mm*70mm*2.0mm, put into the upper surface of the graphite planar boat that step 6 is handled well, then layering superposition, cushion block interlayer is used between every layer, be ￠ 6mm*6mm by specification respectively, 8mm*8mm*5mm, 6mm*4mm*3mm, ￠ 6mm*2mm, ￠ 8mm*2mm cushion block, cushion block keeps point-blank up and down, cushion block waste and old graphite planar boat or scrap stock make,
Step 8, sintering, proceeded in vacuum-sintering integral furnace by stacked good material and sinter, the work box specification of sintering oven is 1200mm*400mm*400mm; Be provided with solvent recovery with paraffin system, solvent recovery with paraffin system comprises condensing works and the two-stage in body of heater outside receives wax apparatus, wherein: condensing works and two-stage receive wax apparatus by pipeline communication, and sinter by the sintering vacuum-temperature process curve set:
A, negative pressure dewax, the intensification slope 10 DEG C/min of 0 DEG C ~ 150 DEG C, and 15 minutes used times, vacuum degree control is within 50Pa, and carrier gas is argon gas, argon flow amount 1.2L/min;
B, negative pressure dewax, the intensification slope 5 DEG C/min of 150 DEG C ~ 200 DEG C, and 10 minutes used times, vacuum degree control is within 200Pa, and carrier gas is argon gas, argon flow amount 1.2L/min;
C, negative pressure dewax, the intensification slope 3 DEG C/min of 200 DEG C ~ 260 DEG C, and 20 minutes used times, vacuum degree control is at 500Pa ~ 800Pa, and carrier gas is argon gas, argon flow amount 1.2L/min;
D, negative pressure dewax, the intensification slope 0.6 DEG C/min of 260 DEG C ~ 320 DEG C, and 100 minutes used times, vacuum degree control is at 500Pa ~ 800Pa, and carrier gas is argon gas, argon flow amount 1.2L/min;
E, negative pressure dewax, the intensification slope 0.4 DEG C/min of 320 DEG C ~ 360 DEG C, and 100 minutes used times, vacuum degree control is at 500Pa ~ 800Pa, and carrier gas is argon gas, argon flow amount 1.2L/min;
F, negative pressure dewax, the intensification slope 1 DEG C/min of 360 DEG C ~ 450 DEG C, and 90 minutes used times, vacuum degree control is at 300Pa ~ 500Pa, and carrier gas is argon gas, argon flow amount 1.2L/min;
G, negative pressure dewax, the intensification slope 3 DEG C/min of 450 DEG C ~ 600 DEG C, and 50 minutes used times, vacuum degree control is at 100Pa ~ 300Pa, and carrier gas is argon gas, argon flow amount 1.2L/min;
H, vacuum sintering, the intensification slope 6.875 DEG C/min of 600 DEG C ~ 1150 DEG C, 80 minutes used times, vacuum degree control is within 200Pa, and carrier gas is argon gas, argon flow amount 1.2L/min;
I, vacuum sintering, the intensification slope 1.625 DEG C/min of 1150 DEG C ~ 1280 DEG C, 80 minutes used times, vacuum degree control is within 50Pa;
J, vacuum sintering, the intensification slope 3.5 DEG C/min of 1280 DEG C ~ 1350 DEG C, 20 minutes used times, vacuum degree control is within 50Pa;
K, dividing potential drop sinter, the intensification slope 3 DEG C/min of 1350 DEG C ~ 1440 DEG C, and 30 minutes used times, vacuum degree control is within 500Pa;
L, dividing potential drop sinter, and 1440 DEG C are incubated 50 minutes, and vacuum degree control is within 500Pa;
M, cool fast, when naturally cooling to 1000 DEG C, applying argon gas cools fast;
N, to come out of the stove, be cooled to less than 80 DEG C blow-on doors to come out of the stove, obtain the hart metal product warehouse-in of the present embodiment.
Whole sintering process process lasts 11 hours, discharging very easily (tailor-(made) coating is effective), product of coming out of the stove has that 1 70mm*70mm*2.0mm's have crackle, mechanical crackle when being compacting from the condition adjudgement of crackle, all other is qualified, by testing bar detected result is: density D=14.08 ton/cubic metre; Cobalt magnetic com=13.5%; Magnetic force He=17kGs; Hardness HRA=90; Intensity TRS=3500; Metallographic A02B00C00E00; Solvent recovery with paraffin rate is 97.39%, does not have paraffin condensation phenomenon in burner hearth; Just can install with graphite planar boat one stove in the present embodiment technique, and can only fill with the boat of prior art the product being no more than 2/3rds.
Embodiment 2
The manufacture craft of a kind of Wimet of the present embodiment, basic step is with embodiment 1, and difference is: after the wiping sieve described in step 4, powder material is 180 orders; 5 hours are incubated in the calcining of graphite planar boat in step 6, specification is 450mm*450mm*6mm and 450mm*300mm*7mm two kinds of specifications, tailor-(made) coating weight part is separately: PEG40001.5 kilogram, aquadag 1 kilogram, high abrasion carbon black 1.5 kilograms, ultra-fine alumina 0.5 kilogram, tween 80 is 0.9 kilogram, pure water 4 kilograms; The half-finished specification of the Wimet that will sinter in step 7 is 40 of 320mm*320mm*2.0mm, 200,100 of 150mm*150mm*5.0mm, 200 of 70mm*70mm*6.0mm of 180mm*180mm*3.0mm, makes graphite pads block specifications and is: ￠ 6mm*2mm, 6mm*4mm*3mm, 8mm*8mm*5mm, ￠ 6mm*6mm with scrapping boat or boat side corner material; In step 8, the work box specification of vacuum-sintering integral furnace is: 1200mm*450mm*450mm, and the step of sintering vacuum-temperature process curve is:
A, negative pressure dewax, the intensification slope 15 DEG C/min of 0 DEG C ~ 150 DEG C, and 10 minutes used times, vacuum degree control is within 50Pa, and carrier gas is argon gas, argon flow amount 0.7L/min;
B, negative pressure dewax, the intensification slope 10 DEG C/min of 150 DEG C ~ 200 DEG C, and 5 minutes used times, vacuum degree control is within 200Pa, and carrier gas is argon gas, argon flow amount 0.7L/min;
C, negative pressure dewax, the intensification slope 5 DEG C/min of 200 DEG C ~ 260 DEG C, and 12 minutes used times, vacuum degree control is at 300Pa ~ 500Pa, and carrier gas is argon gas, argon flow amount 0.7L/min;
D, negative pressure dewax, the intensification slope 0.3 DEG C/min of 260 DEG C ~ 320 DEG C, and 200 minutes used times, vacuum degree control is at 300Pa ~ 500Pa, and carrier gas is argon gas, argon flow amount 0.7L/min;
E, negative pressure dewax, the intensification slope 0.2 DEG C/min of 320 DEG C ~ 360 DEG C, and 200 minutes used times, vacuum degree control is at 300Pa ~ 500Pa, and carrier gas is argon gas, argon flow amount 0.7L/min;
F, negative pressure dewax, the intensification slope 0.5 DEG C/min of 360 DEG C ~ 450 DEG C, and 180 minutes used times, vacuum degree control is within 300Pa, and carrier gas is argon gas, argon flow amount 0.7L/min;
G, negative pressure dewax, the intensification slope 5 DEG C/min of 450 DEG C ~ 600 DEG C, and 30 minutes used times, vacuum degree control is within 100Pa, and carrier gas is argon gas, argon flow amount 0.7L/min;
H, vacuum sintering, the intensification slope 5 DEG C/min of 600 DEG C ~ 1150 DEG C, 110 minutes used times, vacuum degree control is within 200Pa, and carrier gas is argon gas, argon flow amount 0.7L/min;
I, vacuum sintering, the intensification slope 1 DEG C/min of 1150 DEG C ~ 1280 DEG C, 130 minutes used times, vacuum degree control is within 50Pa;
J, vacuum sintering, the intensification slope 2.5 DEG C/min of 1280 DEG C ~ 1350 DEG C, 28 minutes used times, vacuum degree control is within 50Pa;
K, dividing potential drop sinter, the intensification slope 4 DEG C/min of 1350 DEG C ~ 1440 DEG C, and 23 minutes used times, vacuum degree control is within 500Pa;
L, dividing potential drop sinter, and 1440 DEG C are incubated 70 minutes, and vacuum degree control is within 500Pa;
M, cool fast, when naturally cooling to 1000 DEG C, applying argon gas cools fast;
N, to come out of the stove, be cooled to less than 80 DEG C blow-on doors to come out of the stove, obtain the product of the present embodiment.
Whole sintering process process lasts 17 hours, product flawless of coming out of the stove, and discharging very easily (tailor-(made) coating is effective), by testing bar detected result is: density D=14.23 ton/cubic metre; Cobalt magnetic com=12.8%; Magnetic force He=16kGs; Hardness HRA=92; Intensity TRS=4300.Solvent recovery with paraffin rate is 98.33%, does not have paraffin condensation phenomenon in burner hearth; Just can install 540 all products with graphite planar boat one stove in the present embodiment technique, production efficiency is high.
Embodiment 3
The manufacture craft of a kind of Wimet of the present embodiment, basic step is with embodiment 1, and difference is: after the wiping sieve described in step 4, powder material is 120 orders; 3 hours are incubated in the calcining of graphite planar boat in step 6, specification is the dull and stereotyped boat of circular graphitic of ￠ 450mm*6mm, tailor-(made) coating weight part is separately: PEG40002.0 kilogram, aquadag 1.5 kilograms, high abrasion carbon black 1 kilogram, ultra-fine alumina 0.75 kilogram, tween 80 is 0.75 kilogram, pure water 5 kilograms; The half-finished specification of the Wimet that will sinter in step 7 is 350 of ￠ 450mm*6mm; In step 8, the work box specification of vacuum-sintering integral furnace is: 1200mm*450mm*450mm, and the step of sintering vacuum-temperature process curve is:
A, negative pressure dewax, the intensification slope 12 DEG C/min of 0 DEG C ~ 150 DEG C, and 12.5 minutes used times, vacuum degree control is within 50Pa, and carrier gas is argon gas, argon flow amount 0.5L/min;
B, negative pressure dewax, the intensification slope 7 DEG C/min of 150 DEG C ~ 200 DEG C, and 7 minutes used times, vacuum degree control is within 200Pa, and carrier gas is argon gas, argon flow amount 0.5L/min;
C, negative pressure dewax, the intensification slope 4 DEG C/min of 200 DEG C ~ 260 DEG C, and 15 minutes used times, vacuum degree control is at 300Pa ~ 500Pa, and carrier gas is argon gas, argon flow amount 0.5L/min;
D, negative pressure dewax, the intensification slope 1 DEG C/min of 260 DEG C ~ 320 DEG C, and 60 minutes used times, vacuum degree control is at 300Pa ~ 500Pa, and carrier gas is argon gas, argon flow amount 0.5L/min;
E, negative pressure dewax, the intensification slope 0.3 DEG C/min of 320 DEG C ~ 360 DEG C, and 130 minutes used times, vacuum degree control is at 300Pa ~ 500Pa, and carrier gas is argon gas, argon flow amount 0.5L/min;
F, negative pressure dewax, the intensification slope 0.7 DEG C/min of 360 DEG C ~ 450 DEG C, and 130 minutes used times, vacuum degree control is within 300Pa, and carrier gas is argon gas, argon flow amount 0.5L/min;
G, negative pressure dewax, the intensification slope 4 DEG C/min of 450 DEG C ~ 600 DEG C, and 38 minutes used times, vacuum degree control is within 100Pa, and carrier gas is argon gas, argon flow amount 0.5L/min;
H, vacuum sintering, the intensification slope 8 DEG C/min of 600 DEG C ~ 1150 DEG C, 70 minutes used times, vacuum degree control is within 200Pa, and carrier gas is argon gas, argon flow amount 0.5L/min;
I, vacuum sintering, the intensification slope 2 DEG C/min of 1150 DEG C ~ 1280 DEG C, 65 minutes used times, vacuum degree control is within 50Pa;
J, vacuum sintering, the intensification slope 3 DEG C/min of 1280 DEG C ~ 1350 DEG C, 23 minutes used times, vacuum degree control is within 50Pa;
K, dividing potential drop sinter, the intensification slope 4 DEG C/min of 1350 DEG C ~ 1500 DEG C, and 38 minutes used times, vacuum degree control is within 500Pa;
L, dividing potential drop sinter, and 1500 DEG C are incubated 90 minutes, and vacuum degree control is within 500Pa;
M, cool fast, when naturally cooling to 1000 DEG C, applying argon gas cools fast;
N, to come out of the stove, be cooled to less than 80 DEG C blow-on doors to come out of the stove, obtain the product of the present embodiment.
Whole technological process lasts 12 hours, product flawless of coming out of the stove, and discharging very easily (tailor-(made) coating is effective), by testing bar detected result is: density D=13.94 ton/cubic metre; Cobalt magnetic com=14.4%; Magnetic force He=15kGs; Hardness HRA=91.5; Intensity TRS=4100.Solvent recovery with paraffin rate is 98.76%, does not have paraffin to condense phenomenon in burner hearth, the present embodiment be the dull and stereotyped boat of circular graphitic, dress boat is about 2/3 of square boat, and production efficiency is lower, but the quality product of producing and embodiment 1 and 2 basically identical.
Below be schematically described the invention and embodiment thereof, this description is not restricted.So, if those of ordinary skill in the art enlightens by it, when not departing from this creation aim, designing the frame mode similar to this technical scheme and embodiment without creationary, the protection domain of this patent all should be belonged to.
Claims (8)
1. a manufacture craft for Wimet, the steps include:
Step one, batching: by the various powders of Wimet by formulated;
Step 2, ball mill mix:
A, in ball mill, add the powder that alcohol, forming agent and step one prepare by weight ratio;
B, start ball mill, in ball mill bat effect under, polish and be mixed into slip;
Step 3, drying: proceeded to by slip in vacuum drying oven and carry out drying, in irregular particle shape after dry;
Step 4, wiping sieve: be Powdered after dried granular material being carried out wiping sieve;
Step 5, punching press: powder material is pressed product weight and the impact briquetting of specification requirement oil pressure stamping machine in the form of sheets;
The pre-treatment of step 6, graphite planar boat:
A, graphite planar boat surface Graphite Powder 99 to be rooted out in dedicated processes case;
B, in vacuum oven, be warmed up to 1500 DEG C of calcinings, be incubated 3 ~ 5 hours;
C, cooling: the graphite planar boat after sintering soak is cooled to room temperature;
D, swabbing: at surface brush one deck tailor-(made) coating of graphite planar boat;
Step 7, stacked: the upper surface sheet material after step 5 punching press being put into the graphite planar boat that step 6 is handled well, then layering superposition, uses cushion block interlayer between every layer;
Step 8, sintering, proceed to stacked good material in vacuum-sintering integral furnace and sinter;
A, to sinter by the sintering vacuum-temperature process curve set;
B, to come out of the stove, after having sintered, come out of the stove and produce hard alloy finished product warehouse-in;
Wherein, after the wiping sieve described in step 4, powder material is 60 ~ 180 orders; Graphite planar boat described in step 6 and the cushion block described in step 7 are made by the high purity graphite of two leaching three roastings, and density is greater than 1.8 tons/cubic metre; Described graphite planar boat planeness is less than 0.1mm, thickness is 5 ~ 7mm, shape is square or circular, tailor-(made) coating described in step 6 comprises PEG4000, aquadag, high abrasion carbon black, tween 80, ultra-fine alumina and pure water, and tailor-(made) coating weight part is separately: PEG400010 ~ 20; Aquadag 10 ~ 20; High abrasion carbon black 10 ~ 20; Ultra-fine alumina 5 ~ 15; Tween 80 accounts for 5-10; Pure water 30 ~ 50, making processes is: be first dissolved in pure water by PEG4000, then other component is added to successively in PEG4000 lysate and is uniformly mixed.
2. the manufacture craft of a kind of Wimet according to claim 1, is characterized in that: the sheet material after the cushion block described in step 7 and step 5 punching press is contour, and cushion block keeps point-blank up and down.
3. the manufacture craft of a kind of Wimet according to claim 1 and 2, is characterized in that: described cushion block waste and old graphite planar boat or scrap stock make, and represent different height by different shapes, length and width is monolateral is not less than 5mm, is not more than 20mm.
4. the manufacture craft of a kind of Wimet according to claim 3, is characterized in that: the dedicated processes case described in step 6 is showering recycling graphite device.
5. the manufacture craft of a kind of Wimet according to claim 3, is characterized in that: the alcohol purity described in step 2 is greater than 98%, forming agent is No. 58 paraffin.
6. the manufacture craft of a kind of Wimet according to claim 5, is characterized in that: described vacuum-temperature process curve is following steps:
A, negative pressure dewax, intensification slope 10 ~ 15 DEG C/min of 0 DEG C ~ 150 DEG C, and 10 ~ 15 minutes used times, vacuum degree control is within 50Pa;
B, negative pressure dewax, intensification slope 5 ~ 10 DEG C/min of 150 DEG C ~ 200 DEG C, and 5 ~ 10 minutes used times, vacuum degree control is within 200Pa;
C, negative pressure dewax, intensification slope 3 ~ 6 DEG C/min of 200 DEG C ~ 260 DEG C, and 10 ~ 20 minutes used times, vacuum degree control is within 800Pa;
D, negative pressure dewax, intensification slope 0.3 ~ 1 DEG C/min of 260 DEG C ~ 320 DEG C, and 60 ~ 200 minutes used times, vacuum degree control is within 800Pa;
E, negative pressure dewax, intensification slope 0.2 ~ 0.5 DEG C/min of 320 DEG C ~ 360 DEG C, and 80 ~ 200 minutes used times, vacuum degree control is within 800Pa;
F, negative pressure dewax, intensification slope 0.5 ~ 1 DEG C/min of 360 DEG C ~ 450 DEG C, and 90 ~ 180 minutes used times, vacuum degree control is within 500Pa;
G, negative pressure dewax, intensification slope 3 ~ 5 DEG C/min of 450 DEG C ~ 600 DEG C, and 30 ~ 50 minutes used times, vacuum degree control is within 300Pa;
H, vacuum sintering, intensification slope 5 ~ 8 DEG C/min of 600 DEG C ~ 1150 DEG C, 70 ~ 110 minutes used times, vacuum degree control is within 200Pa;
I, vacuum sintering, intensification slope 1 ~ 2 DEG C/min of 1150 DEG C ~ 1280 DEG C, 65 ~ 130 minutes used times, vacuum degree control is within 50Pa;
J, vacuum sintering, intensification slope 2.5 ~ 3.5 DEG C/min of 1280 DEG C ~ 1350 DEG C, 20 ~ 28 minutes used times, vacuum degree control is within 50Pa;
K, dividing potential drop sinter, 1350 DEG C of intensification slope 3 ~ 4 DEG C/min to outlet temperature, and vacuum degree control is within 500Pa;
L, dividing potential drop sinter, outlet temperature insulation 50 ~ 90 minutes, and vacuum degree control is within 500Pa;
M, cool fast, when naturally cooling to 1000 DEG C, applying argon gas cools fast;
N, to come out of the stove, be cooled to less than 80 DEG C blow-on doors to come out of the stove.
7. the manufacture craft of a kind of Wimet according to claim 6, is characterized in that: the carrier gas of the steps A ~ G step of described vacuum-temperature process curve is argon gas, and is provided with solvent recovery with paraffin system; Described argon flow amount is 0.5 ~ 1.2L/min; Described solvent recovery with paraffin system comprises condensing works and the two-stage in body of heater outside receives wax apparatus, wherein: condensing works and two-stage are received wax apparatus and passed through pipeline communication; The vacuum degree control of described C, D, E step is at 300Pa ~ 800Pa; The vacuum degree control of described F step is at 300Pa ~ 500Pa; The vacuum degree control of described G step is at 100Pa ~ 300Pa.
8. the manufacture craft of a kind of Wimet according to claim 7, is characterized in that: be provided with alcohol recovery device in the drying process of described step 3.
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| CN106903318A (en) * | 2017-01-17 | 2017-06-30 | 株洲三鑫硬质合金生产有限公司 | The production technology of hard alloy cutting disc |
| CN109535781A (en) * | 2018-10-29 | 2019-03-29 | 株洲市超宇实业有限责任公司 | A kind of anti-sticking universal lacquer of senior middle school's hard alloy in low cobalt sintering |
| CN109332689B (en) * | 2018-12-12 | 2021-02-09 | 株洲金韦硬质合金有限公司 | Sintering method of hard alloy wrapped anti-sticking coating |
| CN109604607B (en) * | 2018-12-19 | 2020-12-29 | 技锋精密刀具（马鞍山）有限公司 | Production process for effectively improving qualified rate of hard alloy circular cutter blank |
| CN110922796A (en) * | 2019-12-16 | 2020-03-27 | 浙江名鹰合金材料有限公司 | Wear-resistant coating for graphite boat plate and preparation process thereof |
| CN114082949B (en) * | 2021-10-08 | 2024-02-20 | 厦门金鹭特种合金有限公司 | Interlayer for high-temperature sintered hard alloy and manufacturing method thereof |
| CN114309614B (en) * | 2021-12-28 | 2023-12-22 | 乐清市跃宇合金材料有限公司 | Preparation method of alloy blade for step keyhole drill |
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