CN104308163B - The powder injection molding forming method and screw rod product of a kind of screw rod - Google Patents
The powder injection molding forming method and screw rod product of a kind of screw rod Download PDFInfo
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- CN104308163B CN104308163B CN201410567145.XA CN201410567145A CN104308163B CN 104308163 B CN104308163 B CN 104308163B CN 201410567145 A CN201410567145 A CN 201410567145A CN 104308163 B CN104308163 B CN 104308163B
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Abstract
The present invention discloses the powder injection molding forming method and screw rod product of a kind of screw rod, including（1）It is 100 in mass ratio by powdered metal material and binding agent：20 200 be mixed into the feeding of homogeneous；（2）Feeding is inserted into injection machine and carries out injection molding, injection base is obtained；（3）Carry out dewaxing technique processing；（4）It is 200 DEG C of 800 DEG C of progress pre-burnings in temperature, obtains presintered compact；（5）Under protective atmosphere, it is warming up to 1,000 2500 DEG C and 1 10h is sintered to presintered compact, obtain screw rod product.The present invention adds binding agent in metal material powder and mixed, metal material is set to be molded into injection base by injection molding process, then the binding agent of addition is all discharged again by dewaxing technique and pre-sinter process, final high temperature sinter molding, the porosity of screw rod product is greatly reduced, and procedure of processing is reduced, improve production efficiency, and it is the uniformity of injection molding product, reproducible.
Description
Technical field
The invention belongs to field of mechanical technique, and in particular to a kind of powder injection molding forming method of screw rod, squeeze in particular
The powder injection molding forming method and screw rod product of oil machine screw rod.
Background technology
Gutter oil, hogwash fat, saliva oil, false oil, oily, the expired oily harm of poison are self-evident, though the severe strike of country,
Still remain existing despite repeated prohibition, people talk " oil " discoloration, but the method do not evaded, whether people can not determine to eat daily all the time oily true
Health.The household small-size oil press that market was released in recent years can solve the problem of oil product is hygienic, and the oil press is generally used
Screw-type extrusion formula is squeezed, can expressing peanut, soybean, vegetable seed, cottonseed, oily certain herbaceous plants with big flowers, sesame, tea seed, paulownia seed, castor-oil plant, almond, flax
A variety of oil crops such as seed, safflower oilseeds, oenothera seed.Oil plant elite is set completely, to be contamination-freely extracted, and
And oil yield is high, the oil squeezed out can fully keep the genuineness of raw material, retain various nutritional ingredients, without any additive just
Color can be kept complete, be the green that a kind of modern crafts are combined with traditional handicraft without dissolvent residual and saponified matter content
Free of contamination extraction means.
Domestic oil press screw rod is oil press key technology, and screw rod typically uses food-grade stainless steel 304, and it is by power
Outer six sides of input and spiral part composition：Spiral part includes the reducings such as charging, extruding, oil expression, deslagging composition；Screw rod typically has
Two kinds of processing modes, one is turning, milling, and this method speed is slow, tool wear is serious, finish is poor, to machine tool lead screw, guide rail
Damage is serious；2nd, screw rod whirling mill and hydraulic pressure whirlwind Milling Machining technology, the equipment investment are big, and processing charges is higher.
The problem of in terms of in order to solve stainless steel screw rod processing efficiency and cost, the present invention provides a kind of powder injection molding side
Case.
The content of the invention
It is an object of the invention to provide the powder of the powder injection molding forming method, in particular oil press screw rod of a kind of screw rod
Injection molding forming method.
Second object of the present invention is to provide a kind of low screw rod product of porosity.
Unless otherwise defined, all scientific and technical terminologies used herein have such as the ordinary skill in art of the present invention
Identical meanings well known to personnel.In the case of contradiction, it is defined by this specification including definition.
The present invention describes suitable method and material, but is similar to or available equivalent to the method for the invention and material
In implementation or the inspection present invention.In the present invention, described number is all parts by weight.
In the present invention, described injection machine（Also referred to as injection moulding machine）Refer under pressure, by plastics or rubber
It is injected into tool in pattern and a kind of variously-shaped former is made.
Technical scheme is as follows：
A kind of powder injection molding forming method of screw rod, comprises the following steps：
（1）It is 100 in mass ratio by powdered metal material and binding agent：20-200 be mixed into the feeding of homogeneous；
（2）Feeding is inserted into injection machine and carries out injection molding, injection base is obtained；
（3）Injection base is subjected to dewaxing technique processing；
（4）By surplus bonding of the injection base after dewaxing in temperature is 200 DEG C of -800 DEG C of progress pre-burnings, removing injection base
Agent component, obtains presintered compact；
（5）Under protective atmosphere, it is warming up to 1000-2500 DEG C and 1-10h is sintered to presintered compact, obtains screw rod product.
Preferred scheme is, described step（2）Before middle injection, a screw rod is first pre-set inside injection machine mould and is embedded
Part, then inserts injection machine by pellet and is molded.
It is preferred that, described step（2）The injection temperature of middle injection machine is 150-350 DEG C, injection pressure is 5-130Mpa,
Mold temperature is 30-80 DEG C.
Wherein injection temperature is 150-350 DEG C, if temperature is too low, and because feeding viscosity is big, flowing is slow, required
Injection pressure is high, easily causes and shorts；If temperature is too high, cause two-phase laminated flow, cool time is long.And mold temperature requirement is
30-50 DEG C, if too low, it can condense soon, article surface defect is caused due to thermal stress；Temperature is too high, can sticking to mould, cooling
Slowly, jet power is strong, is easily caused the defects such as stomata, cavity.Injection pressure is 5-130mpa, if hypotony, and flow velocity is slow, cold
Solidifying thickness, causes to short, the defect such as face crack；If hypertonia, cause the defects such as mucous membrane, overlap.
Described step（3）Middle dewaxing technique processing refers to injection base being placed in stove, and 1-30h is heated in 100-300 DEG C
Dewaxed；Or 0.5-15h is dewaxed in a solvent by the infiltration of injection base.
Dewaxing technique has two kinds in the present invention, and one kind is to be placed in temperature stove to heat 1-30h progress in 100-300 DEG C
Dewaxing technique processing, its heating-up temperature is 100-300 DEG C very crucial, if temperature is too low to cause dewaxing technique time lengthening,
Too high binding agent to be caused partially carbonized, removing is incomplete.Two be that injection base infiltration dewaxes in 25-50 DEG C of solvent, so that
Make the ratio that follow-up pre-burning workshop section removes binding agent more thoroughly, improve follow-up sintering effect.
The solvent is at least one of normal heptane, hexamethylene, chloromethanes, gasoline, and the solvent temperature is 25-50 DEG C.
Described step（4）Middle burn-in process is divided into three sections, wherein first paragraph temperature be 200-300 DEG C, the time be 30-
180min；Second segment temperature is 300-500 DEG C, the time is 30-180min；3rd section of temperature is 500-800 DEG C, the time is 30-
180min；After binding agent has been removed, then it is warming up to 900-1000 DEG C, is incubated 1-2h, pre-burning obtains the pre-burning with some strength
Base.
Burn-in process of the present invention is divided into three sections of temperature classifications and carries out pre-burning, makes the temperature heating of pre-burning relatively steady, slow, from
And can avoid because the physical chemical differences of binding agent and metal material are excessive and cause zero in follow-up sintering link
Part deformation, split or the defect such as bubble.After the completion of binding agent removing, then 900-1000 DEG C of insulation 1-2h is warming up to, is in order to anti-
The phenomenon that only metal material is cracking in follow-up sintering process, deform.
The step（4）In protective atmosphere is passed through before pre-burning.
More excellent scheme, the protective atmosphere is at least one of hydrogen, argon gas, methane, nitrogen or vacuum gas.
The step（1）In powdered metal material average grain diameter be 0.1-50 μm；Powdered metal material is gold
Belong to powder and/or metal oxide powder.
Present invention selection average grain diameter is 0.1-50 μm of metal dust and/or metal oxide powder, is because of this
The carbon material powder easy-sintering of particle size interval, is conducive to the shaping in later stage.If powder easy injection spherical in shape, but injection base substrate is strong
Degree is low；When powder is in irregular shape, injection blank strength is high, is unlikely to deform after dewaxing technique processing.
The metal dust is selected from iron-based powder, reduced iron powder, carbon structure comminuted steel shot, carbonyl iron dust, carbonyl nickel powder, carbonyl
Tungsten powder, stainless steel powder, high intensity comminuted steel shot, low alloyed steel powder, hard alloy, copper and copper alloy powder, nonferrous metal powder, infusibility
Metal dust, rare earth metal and its alloy powder, noble metal and its at least one of alloy or compound powder；
The metal oxide powder is selected from Zirconium oxide powder, alumina powder, lime powder, croci, oxygen
Change at least one of zinc powder, antimony oxide powder, lead oxide powder, cupric oxide powder.
Further, the nonferrous metal powder is at least one in cobalt powder, magnesium powder, zinc powder, glass putty, bismuth meal and antimony powder
Kind；
The refractory metal powder is selected from least one of tungsten powder, molybdenum powder, nickel powder, cobalt powder, copper powder, tungsten carbide powder.
The raw material of described binding agent includes thermoplastic resin and wax, and the quality of the thermoplastic resin accounts for the total matter of binding agent
5-95 (wt) % of amount.
The raw material of the binding agent also includes stearic acid；Described thermoplastic resin is polypropylene, polyethylene, polyphenyl second
At least one of alkene, polyvinyl chloride, ethylene-vinyl acetate copolymer；The wax is at least one in paraffin, Brazil wax
Kind.
Specific binding agent is made up of the component of following number：69 parts of paraffin, 10 parts of Brazil wax, 1 part of stearic acid,
20 parts of ethylene-vinyl acetate copolymers；
Or 50 parts of paraffin, 50 parts of low density polyethylene (LDPE)s.
Or 20 parts of polypropylene, 10 parts of paraffin, 68 parts of Brazil waxs, 1 part of stearic acid.
Or 10 parts of ethylene-vinyl acetate copolymers, 79 parts of paraffin, 10 parts of Brazil waxs, 1 part of stearic acid.
Or 70 parts of polystyrene, 15 parts of polypropylene, 10 parts of polyethylene, 5 parts of paraffin.
Another goal of the invention of the present invention is to provide a kind of screw rod prepared according to above-mentioned powder injection molding forming method, institute
The porosity for stating screw rod is 0.1-2.5%.
The present invention adds binding agent in metal material powder and mixed, and metal material is passed through injection molding process
Injection base is molded into, then the binding agent of addition is all discharged again by dewaxing technique and pre-sinter process, 1000- is finally carried out
2500 DEG C of high temperature sinterings, it is achieved thereby that screw rod is molded, and are greatly reduced the porosity of product.
So beneficial effects of the present invention have：
（1）The forming method of the present invention can be by the labyrinth product of metal material moulding such as oil press screw-type：
The present invention is blank product directly by metal material and binding agent injection molding using injection machine, it is ensured that material is abundant
Full of mold cavity, the realization of part labyrinth is also ensured that.Individual elements were first made in conventional machining techniques in the past
The mode of component is combined into, can contemplate when using the technology of the present invention and be integrated into complete single component, greatly reduce step
Suddenly, procedure is simplified.
The technology of the present invention is compared with other method for metal working, and product's dimensional precision is high, it is not necessary to carry out secondary operation or only
It need to finish on a small quantity.Injection molding technique can straight forming thin-walled, complex structural member, article shape close to final products will
Ask, the processing cost for the hard alloy for being difficult to be machined for reduction, the refining losses for reducing precious metal especially has
It is significant.
（2）Moulded products microstructure of the present invention is uniform, porosity is low
The product being molded by forming method of the present invention, the height of its porosity is the most important thing.The low meaning of product porosity
Taste that microstructure is closely knit, and the performance such as mechanics, electricity, calorifics is excellent.The oil press screw rod that the present invention is molded, porosity
Very low is only 0.1-2.5%, excellent performance.
（3）The cost of forming method of the present invention is low, efficiency high, it is easy to accomplish high-volume and large-scale production
Forming method of the present invention greatly improves production efficiency, reduction production due to utilizing injection machine shaped article blank
Cost, and it is the uniformity of injection molding product, reproducible, so as to be that high-volume and scale industrial production provide guarantor
Card.
（4）Suitable material scope is wide, and application field is wide
Raw material employed in forming method of the present invention widely, in principle it is any can high temperature sintering dusty material
It is applicable, including difficult-to-machine material and materials with high melting point in conventional fabrication processes.In addition, the technology of the present invention can also basis
User requires to carry out material prescription research, manufactures the alloy material of any combination, composite is shaped into part, widened significantly
Application field.
Brief description of the drawings
Fig. 1 is screw rod inserts,
Fig. 2 is the profile of the oil press screw rod of one of shaped article,
In figure：1 is screw rod inserts, and 2 be injection base.
Embodiment
The present invention is further illustrated with reference to embodiments.
As shown in Figure 1, 2, using the forming method of the present invention, first screw rod inserts 1 is previously placed in inside injection machine mould,
The feeding that powdered metal material and binding agent are mixed into homogeneous again, which is placed in progress injection molding in injection machine, must be molded base 2,
Finally obtain screw rod product with after preheating, carrying out high temperature sintering through dewaxing again.
Embodiment 1
（1）100 parts of particle diameters are mixed into the feeding of homogeneous, binding agent for 20 μm of carbonyl iron dust and 200 parts of binding agent
By 50 parts of paraffin, 50 parts of low density polyethylene (LDPE) compositions.
（2）An inserts is pre-set inside injection machine mould, mold temperature is 30 DEG C；Mixing feeding is inserted into injection machine to enter
Row injection molding, is made injection base；Injection temperature is 150 DEG C, injection pressure is 5Mpa.
（3）Injection base is placed in stove, 1h, dewaxing are heated in 200 DEG C；
（4）Under hydrogen shield atmosphere, the injection base after dewaxing is subjected to pre-burning, 200 DEG C of calcined temperature insulation 180min,
300 DEG C of insulation 120min, 600 DEG C of insulation 100min, to remove the surplus binder component in injection base；Then heat to
1000 DEG C, 2h is incubated, pre-burning obtains the presintered compact with some strength；
（5）Under hydrogen shield atmosphere, by presintered compact at 1500 DEG C, 10h is sintered, screw rod product is obtained.
Embodiment 2
（1）100 parts of particle diameters are mixed into the feeding of homogeneous for 10 μm of carbonyl nickel powder powder and 150 parts of binding agent, glued
Knot agent is made up of 20 parts of polypropylene, 10 parts of paraffin, 68 parts of Brazil waxs, 1 part of stearic acid.
（2）An inserts is pre-set inside injection machine mould, mold temperature is 50 DEG C；Mixing feeding is inserted into injection machine to enter
Row injection molding, is made injection base；Injection temperature is 180 DEG C, injection pressure is 15Mpa.
（3）Injection base is placed in stove, 170 DEG C, soaking time 1h, dewaxing are heated to；
（4）Under argon atmosphere, the injection base after dewaxing is subjected to pre-burning, 250 DEG C of insulation 60min of calcined temperature；
（2）400 DEG C of insulation 80min；（3）700 DEG C of insulation 100min, to remove the surplus binder component in injection base；Then rise
Temperature is incubated 2h to 900 DEG C, and pre-burning obtains the presintered compact with some strength；
（5）Under argon atmosphere, by presintered compact at 2500 DEG C, 1h is sintered, screw rod product is obtained.
Embodiment 3
（1）100 parts of particle diameters are mixed into the feeding of homogeneous for 1 μm of carbonyl tungsten powder powder and 100 parts of binding agent, bonded
Agent is made up of 10 parts of ethylene-vinyl acetate copolymers, 79 parts of paraffin, 10 parts of Brazil waxs, 1 part of stearic acid.
（2）An inserts is pre-set inside injection machine mould, mold temperature is 80 DEG C；Mixing feeding is inserted into injection machine to enter
Row injection molding, is made injection base；Injection temperature is 200 DEG C, injection pressure is 35Mpa.
（3）Injection base is placed in stove, 170 DEG C, soaking time 10h, dewaxing are heated to；
（4）Under argon atmosphere, the injection base after dewaxing is subjected to pre-burning, 300 DEG C of insulation 30min of calcined temperature；
500 DEG C of insulation 60min；800 DEG C of insulation 180min；To remove the surplus binder component in injection base；
（5）Under argon atmosphere, by presintered compact at 2200 DEG C, sintering 2h obtains screw rod product.
Embodiment 4
（1）100 parts of particle diameters are mixed into the feeding of homogeneous for 0.1 μm of carbonyl tungsten powder powder and 50 parts of binding agent, glued
Agent is tied by 70 parts of polystyrene, 15 parts of polypropylene, 10 parts of polyethylene, 5 parts of paraffin compositions.
（2）An inserts is pre-set inside injection machine mould, mold temperature is 50 DEG C；Mixing feeding is inserted into injection machine to enter
Row injection molding, is made injection base；Injection temperature is 250 DEG C, injection pressure is 55Mpa.
（3）Injection base is placed in stove, 160 DEG C, soaking time 2h, dewaxing are heated to；
（4）Under methane protective atmosphere, the injection base after dewaxing is subjected to pre-burning, 200 DEG C of insulation 30min of calcined temperature；
300 DEG C of insulation 30min；800 DEG C of insulation 120min；To remove the surplus binder component in injection base；1000 DEG C are warming up to,
1.5h is incubated, pre-burning obtains the presintered compact with some strength；
（5）Under methane protective atmosphere, presintered compact is being warming up to 1800 DEG C, sintering time 5h obtains screw rod product.
Embodiment 5
（1）Particle diameter is mixed into homogeneous for 0.001 μm of 50 parts of carbonyl iron dusts, 50 parts of carbonyl nickel powders and 20 parts of binding agent
Feeding, binding agent is by 80 parts of polystyrene, 10 parts of polyethylene, 5 parts of paraffin compositions.
（2）An inserts is pre-set inside injection machine mould, mold temperature is 40 DEG C；Mixing feeding is inserted into injection machine to enter
Row injection molding, is made injection base；Injection temperature is 150 DEG C, injection pressure is 100Mpa.
（3）Injection base is infiltrated in normal heptane：Hexamethylene volume ratio is 1：1 in the mixed solvent dewaxing, solvent temperature 40
DEG C, soaking time 1h；
（4）Under methane protective atmosphere, the injection base after dewaxing is subjected to pre-burning, 240 DEG C of insulation 60min of calcined temperature；
360 DEG C of insulation 60min；700 DEG C of insulation 60min；To remove the surplus binder component in injection base；1000 DEG C are warming up to,
2h is incubated, pre-burning obtains the presintered compact with some strength；
（5）Under methane protective atmosphere, 1200 DEG C are warming up to, sintering 2h obtains screw rod product.
Embodiment 6
（1）100 parts of particle diameters are mixed into the feeding of homogeneous for 0.01 μm of Zirconium oxide powder and 10 parts of binding agent, bonded
Agent is by 10 parts of polystyrene, 75 parts of polypropylene, 10 parts of polyethylene, 5 parts of paraffin compositions.
（2）An inserts is pre-set inside injection machine mould, mold temperature is 40 DEG C；Mixing feeding is inserted into injection machine to enter
Row injection molding, is made injection base；Injection temperature is 210 DEG C, injection pressure is 75Mpa.
（3）Injection base infiltration is dewaxed in chloromethanes, 30 DEG C of solvent temperature, soaking time 1h；
（4）Under nitrogen protection atmosphere, the injection base after dewaxing is subjected to pre-burning, 250 DEG C of insulation 80min of calcined temperature；
350 DEG C of insulation 60min；600 DEG C of insulation 180min, to remove the surplus binder component in injection base；1000 DEG C are warming up to,
1.5h is incubated, pre-burning obtains the presintered compact with some strength；
（5）Under nitrogen protection atmosphere, 1500 DEG C are warming up to, sintering 1h obtains screw rod product.
Embodiment 7
（1）Particle diameter is mixed into homogeneous for 0.1 μm of 40 parts of carbonyl iron dusts, 60 parts of cupric oxide powders and 5 parts of binding agent
Feeding, binding agent is made up of 5 parts of ethylene-vinyl acetate copolymers, 79 parts of paraffin, 15 parts of Brazil waxs, 1 part of stearic acid.
（2）An inserts is pre-set inside injection machine mould, mold temperature is 60 DEG C；Mixing feeding is inserted into injection machine to enter
Row injection molding, is made injection base；Injection temperature is 250 DEG C, injection pressure is 85Mpa.
（3）Injection base infiltration is dewaxed in the oil, 25 DEG C of solvent temperature, soaking time 5h；
（4）Under hydrogen shield atmosphere, the injection base after dewaxing is subjected to pre-burning, 300 DEG C of insulation 30min of calcined temperature；
400 DEG C of insulation 30min；600 DEG C of insulation 120min, to remove the surplus binder component in injection base；1000 DEG C are warming up to,
1.5h is incubated, pre-burning obtains the presintered compact with some strength；
（5）Under hydrogen shield atmosphere, 1300 DEG C are warming up to, sintering 5h obtains screw rod product.
Embodiment 8
（1）Particle diameter is mixed into homogeneous for 0.01 μm of 30 parts of carbonyl nickel powders, 70 parts of antimony oxide powder and 2 parts of binding agent
Feeding, binding agent is made up of 30 parts of ethylene-vinyl acetate copolymers, 59 parts of paraffin, 25 parts of Brazil waxs, 1 part of stearic acid.
（2）An inserts is pre-set inside injection machine mould, mold temperature is 40 DEG C；Mixing feeding is inserted into injection machine to enter
Row injection molding, is made injection base；Injection temperature is 350 DEG C, injection pressure is 85Mpa.
（3）Injection base infiltration is dewaxed in hexamethylene, 40 DEG C of solvent temperature, soaking time 3h；
（4）Under nitrogen protection atmosphere, the injection base after dewaxing is subjected to pre-burning, 200 DEG C of insulation 30min of calcined temperature；
300 DEG C of insulation 30min；800 DEG C of insulation 120min, to remove the surplus binder component in injection base；Then heat to
1000 DEG C, 2h is incubated, pre-burning obtains the presintered compact with some strength；
（5）Under nitrogen protection atmosphere, 1800 DEG C are warming up to, sintering 1.5h obtains screw rod product.
Embodiment 9
（1）Particle diameter is mixed into for 0.001 μm of 80 parts of carbonyl iron dusts, 20 parts of cupric oxide powders and 80 parts of binding agent
The feeding of matter, binding agent is made up of 15 parts of polypropylene copolymers, 69 parts of paraffin, 15 parts of Brazil waxs, 1 part of stearic acid.
（2）Mixing feeding is inserted into injection machine and carries out injection molding, injection base is made；Injection temperature is 150 DEG C；Mould temperature
Spend for 40 DEG C；Injection pressure is 45Mpa.
（3）Injection base infiltration is dewaxed in normal heptane, 50 DEG C of solvent temperature, soaking time 0.5h；
（4）Under hydrogen shield atmosphere, the injection base after dewaxing is subjected to pre-burning, 200 DEG C of insulation 30min of calcined temperature；
300 DEG C of insulation 30min；800 DEG C of insulation 120min, to remove the surplus binder component in injection base；950 DEG C are warming up to,
2h is incubated, pre-burning obtains the presintered compact with some strength；
（5）Under hydrogen shield atmosphere, 1400 DEG C are warming up to, sintering 2h obtains screw rod product.
Embodiment 10
（1）By particle diameter for 0.005 μm 90 parts of carbonyl tungsten powders, 10 parts of antimony oxide powder are mixed into 40 parts of binding agent
The feeding of homogeneous, binding agent is made up of 30 parts of polypropylene, 10 parts of paraffin, 58 parts of Brazil waxs, 2 parts of stearic acid.
（2）Mixing feeding is inserted into injection machine and carries out injection molding, injection base is made；Injection temperature is 250 DEG C；Mould temperature
Spend for 40 DEG C；Injection pressure is 95Mpa.
（3）Injection base is placed in stove, 300 DEG C, soaking time 5h, dewaxing are heated to；
（4）Under methane protective atmosphere, the injection base after dewaxing is subjected to pre-burning, 200 DEG C of insulation 30min of calcined temperature；
300 DEG C of insulation 30min；800 DEG C of insulation 120min, to remove the surplus binder component in injection base；900 DEG C are warming up to,
1h is incubated, pre-burning obtains the presintered compact with some strength；
（5）Under methane protective atmosphere, 1000 DEG C are warming up to, sintering 6h obtains screw rod product.
Embodiment 11
（1）10 parts of particle diameters are mixed into for 0.05 μm of carbonyl tungsten powder, 90 parts of Zinc oxide powders and 120 parts of binding agent
The feeding of matter, binding agent is made up of 40 parts of polypropylene, 10 parts of paraffin, 48 parts of Brazil waxs, 1 part of stearic acid.
（2）Mixing feeding is inserted into injection machine and carries out injection molding, injection base is made；Injection temperature is 150 DEG C；Mould temperature
Spend for 50 DEG C；Injection pressure is 100Mpa.
（3）Injection base is placed in stove, 100 DEG C, soaking time 30h, dewaxing are heated to；
（4）Under methane protective atmosphere, the injection base after dewaxing is subjected to pre-burning, 240 DEG C of insulation 60min of calcined temperature；
360 DEG C of insulation 60min；720 DEG C of insulation 90min, to remove the surplus binder component in injection base；1000 DEG C are warming up to,
1h is incubated, pre-burning obtains the presintered compact with some strength；
（5）Under methane protective atmosphere, 1700 DEG C are warming up to, sintering 3h obtains screw rod product.
Embodiment 12
（1）Particle diameter is mixed into homogeneous for 10 μm of 50 parts of carbonyl iron dusts, 50 parts of Zirconium oxide powders and 160 parts of binding agent
Feeding, binding agent is made up of 50 parts of polypropylene, 10 parts of paraffin, 38 parts of Brazil waxs, 2 parts of stearic acid.
（2）Mixing feeding is inserted into injection machine and carries out injection molding, injection base is made；Injection temperature is 150 DEG C；Mould temperature
Spend for 40 DEG C；Injection pressure is 130Mpa.
（3）Injection base is placed in stove, 160 DEG C, soaking time 3h, dewaxing are heated to；
（4）Under methane protective atmosphere, the injection base after dewaxing is subjected to pre-burning, 250 DEG C of insulation 120min of calcined temperature；
350 DEG C of insulation 120min；750 DEG C of insulation 100min；, to remove the surplus binder component in injection base；It is warming up to 800
DEG C, 2h is incubated, pre-burning obtains the presintered compact with some strength.
（5）Under methane protective atmosphere, 1000 DEG C are warming up to, sintering 8h obtains screw rod product.
The screw rod product that above-described embodiment 1-12 is molded detects its hole by porosity testing standard GB/T 24586-2009
Gap rate, shown in table one specific as follows：
The metallic article product being molded by the forming method of the present invention, its porosity is low, also implies that product product
Microstructure is closely knit, makes the performances such as its mechanics, electricity, calorifics excellent.As can be seen from Table I, the material that the present invention is molded
Material, with very low porosity, is 0.1-2.5%, excellent combination property, it is easy to accomplish high-volume and large-scale production.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using this hair
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without passing through performing creative labour.Therefore, the invention is not restricted to implementation here
Example, those skilled in the art do not depart from improvement that scope made and change all should be according to the announcement of the present invention
Within protection scope of the present invention.
Claims (10)
1. a kind of powder injection molding forming method of screw rod, it is characterised in that：Comprise the following steps：
（1）It is 100 in mass ratio by powdered metal material and binding agent：20-200 be mixed into the feeding of homogeneous；
（2）A screw rod embedded component is first pre-set inside injection machine mould, then feeding is inserted into injection machine and carries out injection molding,
Base must be molded；The injection temperature of the injection machine is 160-350 DEG C, injection pressure is 15-130Mpa, and mold temperature is 50-80
℃；
（3）Injection base is placed in stove, heating 1-30h in 100-300 DEG C carries out dewaxing technique processing；
（4）By surplus binding agent group of the injection base after dewaxing in temperature is 200 DEG C of -800 DEG C of progress pre-burnings, removing injection base
Point, obtain presintered compact；
（5）Under protective atmosphere, it is warming up to 1000-2500 DEG C and 1-10h is sintered to presintered compact, obtains screw rod product；
The binding agent is made up of the component of following number：69 parts of paraffin, 10 parts of Brazil wax, 1 part, 20 parts second of stearic acid
Alkene-acetate ethylene copolymer；Or 50 parts of paraffin, 50 parts of low density polyethylene (LDPE)s；Or 20 parts of polypropylene, 10 parts of paraffin, 68 parts of Brazil
Palm wax, 1 part of stearic acid；Or 10 parts of ethylene-vinyl acetate copolymers, 79 parts of paraffin, 10 parts of Brazil waxs, 1 part of stearic acid；
Or 70 parts of polystyrene, 15 parts of polypropylene, 10 parts of polyethylene, 5 parts of paraffin.
2. a kind of powder injection molding forming method of screw rod according to claim 1, it is characterised in that：Described step（4）
Middle burn-in process is divided into three sections, wherein first paragraph temperature be 200-300 DEG C, the time be 30-180min；Second segment temperature is 300-
500 DEG C, the time be 30-180min；3rd section of temperature is 500-800 DEG C, the time is 30-180min；After binding agent has been removed, then
900-1000 DEG C is warming up to, 1-2h is incubated, pre-burning obtains the presintered compact with some strength.
3. a kind of powder injection molding forming method of screw rod according to claim 1, it is characterised in that：The step（4）In
Protective atmosphere is passed through before pre-burning.
4. a kind of powder injection molding forming method of screw rod according to claim 1 or 3, it is characterised in that：The protection gas
Atmosphere is at least one of hydrogen, argon gas, methane, nitrogen or vacuum gas.
5. a kind of powder injection molding forming method of screw rod according to claim 1, it is characterised in that：The step（1）In
Powdered metal material average grain diameter be 0.1-50 μm；Powdered metal material is metal dust and/or metal oxide
Powder.
6. a kind of powder injection molding forming method of screw rod according to claim 5, it is characterised in that：The metal dust choosing
From iron-based powder, reduced iron powder, carbon structure comminuted steel shot, carbonyl iron dust, carbonyl nickel powder, carbonyl tungsten powder, stainless steel powder, high strength steel
Powder, low alloyed steel powder, hard alloy, copper and copper alloy powder, nonferrous metal powder, refractory metal powder, rare earth metal and its
Alloy powder, noble metal and its at least one of alloy or compound powder；
The metal oxide powder is selected from Zirconium oxide powder, alumina powder, lime powder, croci, zinc oxide
At least one of powder, antimony oxide powder, lead oxide powder, cupric oxide powder.
7. a kind of powder injection molding forming method of screw rod according to claim 6, it is characterised in that：The non-ferrous metal powder
End is selected from least one of cobalt powder, magnesium powder, zinc powder, glass putty, bismuth meal and antimony powder；
The refractory metal powder is selected from least one of tungsten powder, molybdenum powder, nickel powder, cobalt powder, copper powder, tungsten carbide powder.
8. a kind of powder injection molding forming method of screw rod according to claim 1, it is characterised in that：Described binding agent
Raw material includes thermoplastic resin and wax, and the quality of the thermoplastic resin accounts for 5-95 (wt) % of binding agent gross mass.
9. a kind of powder injection molding forming method of screw rod according to claim 8, it is characterised in that：The original of the binding agent
Material also includes stearic acid；Described thermoplastic resin is polypropylene, polyethylene, polystyrene, polyvinyl chloride, ethyl vinyl acetate second
At least one of alkene copolymer；The wax is at least one of paraffin, Brazil wax.
10. screw rod prepared by a kind of any one powder injection molding forming method as described in claim 1-9, it is characterised in that：Institute
The porosity for stating screw rod is 0.1-2.5%.
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