CN112317747A - Thermal reverse type metal powder sintering process - Google Patents
Thermal reverse type metal powder sintering process Download PDFInfo
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- CN112317747A CN112317747A CN202010940488.1A CN202010940488A CN112317747A CN 112317747 A CN112317747 A CN 112317747A CN 202010940488 A CN202010940488 A CN 202010940488A CN 112317747 A CN112317747 A CN 112317747A
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- 239000002184 metal Substances 0.000 title claims abstract description 105
- 239000000843 powder Substances 0.000 title claims abstract description 97
- 238000005245 sintering Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000008569 process Effects 0.000 title claims abstract description 18
- 238000003860 storage Methods 0.000 claims abstract description 63
- 239000011261 inert gas Substances 0.000 claims abstract description 41
- 238000000265 homogenisation Methods 0.000 claims abstract description 21
- 238000009423 ventilation Methods 0.000 claims description 35
- 239000007787 solid Substances 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 2
- 230000035699 permeability Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 239000000047 product Substances 0.000 description 13
- 239000007789 gas Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000011148 porous material Substances 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012943 hotmelt Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 206010063659 Aversion Diseases 0.000 description 2
- 208000034189 Sclerosis Diseases 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
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- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009694 cold isostatic pressing Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/003—Apparatus, e.g. furnaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1121—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
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Abstract
The invention discloses a heat reversal type metal powder sintering process, which belongs to the technical field of metal powder sintering, and can be used for introducing high-temperature inert gas into a homogenization heat conduction net before sintering, carrying out heat reversal treatment on the pressed and formed metal powder, heating the homogenization heat conduction net to cause an internal expansion oil storage ball to expand, extending an outward through rod to the outside of a reversal overflow ball, realizing the permeability between the internal expansion oil storage ball and the formed metal powder, causing heat conduction oil to reversely overflow from inside to outside and to be uniformly dispersed into the formed metal powder, further remarkably improving the heating speed of the inside of the metal powder during sintering, further reducing the temperature difference inside and outside the metal powder, leading the internal and external sintering degrees of the metal powder to be more uniform during sintering and forming, further improving the quality and the strength of a finished product, and simultaneously leading the inert gas to achieve a certain hole expanding effect in the formed metal powder, the efficiency of pore-forming during sintering is improved.
Description
Technical Field
The invention relates to the technical field of metal powder sintering, in particular to a hot reversal type metal powder sintering process.
Background
Sintering of metal powder means that various metal powders are instantaneously heated to a molten state by infrared laser to be molded. The technology was developed and researched as a kind of Rapid Prototyping (RP) technology in the early stage, but with the maturity and application of the technology, it was found that the metal powder sintering equipment can be fully used as a new generation of low-carbon rapid manufacturing equipment, and the technology has been used as a new generation of production and manufacturing equipment in various industries.
The sintered metal powder filter element is prepared by adopting metal powder as a raw material, adding no adhesive, forming by cold isostatic pressing and sintering at high temperature in vacuum. The pore size and distribution of the element can be adjusted by matching the particle size of the metal powder and the process parameters. The characteristics of pore structures, material components, compressive strength and the like of different filtering materials are utilized to develop a filtering product finally suitable for users.
When the metal powder is used for preparing the porous material, the metal powder is completely connected together by sintering, and the porous metal finished product is brittle and easy to break accidentally due to the porosity, so that when the metal powder is sintered, certain temperature difference exists between the metal powder positioned in the porous metal finished product and the metal powder on the surface due to the position relationship, the integral sintering uniformity is difficult to ensure, and the strength of the finished product is influenced.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a heat reversal type metal powder sintering process, which can introduce high-temperature inert gas into a homogenization heat conduction net before sintering through the arrangement of the homogenization heat conduction net and a discrete ventilation frame, carry out heat reversal treatment on the metal powder formed by pressing, heat the homogenization heat conduction net to cause an internal expansion oil storage ball to expand, lead an external through rod to extend to the outside of a reversal overflow ball, realize the ventilation between the internal expansion oil storage ball and the formed metal powder, lead heat conduction oil to reversely overflow from inside to outside and be uniformly dispersed into the formed metal powder, further remarkably improve the heating speed of the inside of the metal powder during sintering, further reduce the temperature difference between the inside and the outside of the metal powder, lead the sintering degree of the inside and the outside of the metal powder to be more uniform during sintering and forming, further improve the quality and the strength of a finished product, and simultaneously lead the inert gas overflowing together with the heat conduction oil, can achieve certain reaming effect in the formed metal powder before sintering, and improve the efficiency of pore-forming during sintering.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A hot reversal type metal powder sintering process comprises the following steps:
s1, firstly, selecting metal powder meeting the requirement of the particle size according to the requirement;
s2, uniformly covering and filling the metal powder into a homogenizing heat conduction net, pressing and forming, and then mutually adsorbing and connecting the lower ends of the homogenizing heat conduction net corresponding to the discrete ventilation frames;
s3, performing thermal reverse processing before sintering, namely introducing high-temperature inert gas into the homogenizing heat conduction network through the discrete gas introducing frame, wherein the high-temperature inert gas enables the heat conduction oil in the homogenizing heat conduction network to reversely overflow from inside to outside along with the high-temperature inert gas and uniformly disperse into the formed metal powder;
and S4, high-temperature sintering, namely separating the metal powder formed in the previous step from the discrete ventilation frame, then lowering the metal powder and putting the metal powder into a sintering furnace for high-temperature sintering, reducing the temperature difference between the inside and the outside of the metal powder under the action of heat conduction oil, meanwhile, the heat conduction oil is in the state of gaseous micromolecules overflowing at high temperature, and assisting in pore forming to obtain a porous metal finished product which is uniformly sintered.
Further, the temperature of the high-temperature inert gas in the S3 is not lower than 300 ℃.
Furthermore, the homogenization heat conduction net comprises a plurality of hollow connecting wires which are intersected with each other and a plurality of reverse overflow balls which are respectively connected to the intersections of the hollow connecting wires, the discrete ventilation frame comprises a plurality of ventilation rods and discrete ball points, the discrete ball points are fixedly connected with the ventilation rods, and the discrete ball points are respectively and fixedly connected with the intersections of the plurality of hollow connecting wires at the lowest position.
Further, ventilation rod, discrete ball point, hollow continuous filament and reverse excessive ball are interconnected mutually and are led to, and four are the heat conduction material and make for communicate each other between homogenization heat conduction net and the discrete frame of ventilating, thereby effectively guarantee that the high temperature inert gas that lets in can be even dispersion to the press forming's metal powder in, make metal powder when sintering forming, inside and outside sintering degree is more even, thereby effectively improve off-the-shelf quality and intensity.
Furthermore, the discrete sphere point comprises a directional hemisphere fixedly connected with the hollow connecting wire and a moving hemisphere fixedly connected with the ventilation rod, one ends, close to each other, of the directional hemisphere and the moving hemisphere are fixedly connected with magnetic rings, the two magnetic rings are mutually adsorbed, and the connection and the disassembly between the homogenizing heat conduction net and the discrete ventilation frame are facilitated, so that the formed metal powder can be separated from the discrete ventilation frame before sintering, the discrete ventilation frame can be reused, and the production cost is effectively reduced.
Furthermore, an inner expansion oil storage ball is placed in the reverse oil spilling ball, heat conducting oil and bubbles wrapped with inert gas are filled in the inner expansion oil storage ball, a plurality of outward through rods which are uniformly distributed are fixedly connected to the outer end of the inner expansion oil storage ball, a plurality of through holes which are uniformly distributed are cut on the reverse oil spilling ball, a rubber diaphragm is fixedly connected to the outward hole opening of each through hole, the through holes are matched with the outward through rods, a heat conduction limiting rod is embedded at one end, close to the reverse oil spilling ball, of each hollow connecting wire, penetrates through the reverse oil spilling ball and the inner expansion oil storage ball and extends into the inner expansion oil storage ball, when high-temperature inert gas is introduced, the hollow connecting wires can enter the reverse oil spilling ball, heat can be rapidly introduced into the inner expansion oil storage ball under the action of the heat conduction limiting rod, and accordingly gas wrapped with the inert gas in the inner expansion oil storage ball is continuously expanded to generate explosive cracks, on the one hand the mobility of conduction oil with higher speed, thereby make the temperature variation of conduction oil more even, make it when dispersion to metal powder in, effectively guarantee the homogeneity of metal powder bulk temperature, make when the sintering, the inside and outside degree of consistency is higher, on the other hand, can make the interior bloated oil storage ball constantly expand, make in the outside expert pole can imbed the through-hole, make the through-hole punctured, outside expert pole extends to reverse excessive outside the ball simultaneously, realize the permeability between the interior bloated oil storage ball and the fashioned metal powder, be convenient for spill over of conduction oil, the thermal conductance gag lever post can also be spacing to the interior bloated oil storage ball, make it difficult aversion when the inflation, it is convenient for outside expert pole to get into in the through-hole.
Further, the heat conduction gag lever post is including being located the heat conduction porous rod of hollow continuous silk and extending to the heat conduction solid pole in the interior bloated oil storage ball, heat conduction solid pole and the porous pole fixed connection of heat conduction.
Further, the extroversion leads to the pole include with the outer thorn pole of the interior bloated oil storage ball fixed connection and the fixed interior heat conduction pole that runs through the interior bloated oil storage ball, interior heat conduction pole one end is located outer thorn pole, in the interior heat conduction pole other end extends to interior bloated oil storage ball, interior heat conduction pole is used for the heat conduction for the speed that outer thorn pole department gas spills over is less than the speed of gas expansion, is convenient for on the one hand to accelerate outer thorn pole inflation sclerosis, thereby reduces its degree of difficulty of punctureing the rubber diaphragm, and on the other hand, when outer thorn pole constantly bloated greatly, micropore on it constantly increases, and the molecule of the conduction oil of being convenient for spills over from extroversion leads to the pole department.
Furthermore, the outer thorn rod is of a microporous structure and is communicated with the inner expansion oil storage ball.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) this scheme can be before the sintering to let in high temperature inert gas in the homogenization heat conduction net, carry out hot reverse processing to press forming's metal powder, homogenization heat conduction net is heated, lead to interior bloated oil storage ball inflation, make outside expert pole extend to outside reverse ball that overflows, the permeability between the metal powder of realization interior bloated oil storage ball and shaping, make the conduction oil from inside to outside reverse spilling over, and homodisperse is to the fashioned metal powder in, and then show the inside velocity of being heated when the sintering that improves the metal powder, thereby reduce the inside and outside difference in temperature of metal powder, make metal powder when sintering forming, inside and outside sintering degree is more even, and then improve off-the-shelf quality and intensity, inert gas simultaneously, can reach certain reaming effect in the metal powder to the shaping, the efficiency of pore-forming when improving the sintering.
(2) The homogenization heat conduction net comprises a plurality of hollow continuous wires which are mutually crossed and a plurality of reverse overflow balls which are respectively connected at the crossing positions of the hollow continuous wires, the discrete ventilation frame comprises a plurality of ventilation rods and discrete ball points, the discrete ball points are fixedly connected with the ventilation rods, and the discrete ball points are respectively fixedly connected with the crossing positions of the plurality of hollow continuous wires at the bottom.
(3) The ventilation rod, the discrete ball point, the hollow continuous wire and the reverse ball that overflows are interconnected mutually and are linked together, and four are the heat conduction material and make for communicate each other between homogenization heat conduction net and the discrete ventilation frame, thereby effectively guarantee that the high temperature inert gas who lets in can be even dispersion to the press forming's metal powder in, make metal powder when sinter molding, inside and outside sintering degree is more even, thereby effectively improve off-the-shelf quality and intensity.
(4) Discrete ball point include with hollow even silk fixed connection's directional hemisphere and with ventilation bar fixed connection's move to the hemisphere, directional hemisphere and the equal fixedly connected with magnetic ring of the one end that moves to the hemisphere and be close to each other, two magnetic rings adsorb each other, be convenient for homogenization heat conduction net and the discrete frame of ventilating between be connected and dismantle, thereby make before the sintering, fashioned metal powder can with the discrete frame separation of ventilating, and then make the discrete frame of ventilating can used repeatedly, effectively reduction in production cost's input.
(5) An inner expansion oil storage ball is placed in the reverse overflow ball, heat conducting oil and bubbles wrapped with inert gas are filled in the inner expansion oil storage ball, a plurality of evenly distributed outward through rods are fixedly connected to the outer end of the inner expansion oil storage ball, a plurality of evenly distributed through holes are drilled in the reverse overflow ball, rubber diaphragms are fixedly connected to the outward hole openings of the through holes, the through holes are matched with the outward through rods in the direction, a heat conduction limiting rod is embedded at one end, close to the reverse overflow ball, of a hollow connecting wire, the heat conduction limiting rod penetrates through the reverse overflow ball and the inner expansion oil storage ball and extends into the inner expansion oil storage ball, when high-temperature inert gas is introduced, the high-temperature inert gas can enter the reverse overflow ball along the hollow connecting wire, heat conducting oil can be rapidly guided into the inner expansion oil storage ball under the action of the heat conduction limiting rod, and accordingly the inert gas wrapped with the inert gas in the inner expansion oil storage ball is continuously expanded to generate explosive fracture, and on the one hand, the other hand, thereby make the temperature variation of conduction oil more even, make it when dispersion to metal powder in, effectively guarantee the homogeneity of metal powder bulk temperature, make when the sintering, the inside and outside degree of consistency is higher, on the other hand, can make the interior oil storage ball that expands constantly expand, make in the outside lead-to pole can imbed the through-hole, make the through-hole punctured, outside the lead-to pole extends to reverse excessive outside the ball simultaneously, realize the permeability between the interior oil storage ball that expands and the fashioned metal powder, be convenient for overflow of conduction oil, the thermal conductance gag lever post can also carry on spacingly to the interior oil storage ball that expands, make it difficult aversion when the inflation, it gets into in the through-hole to be convenient for outside lead-to pole.
(6) The heat conduction limiting rod comprises a heat conduction porous rod positioned in the hollow connecting wire and a heat conduction solid rod extending into the internal expansion oil storage ball, and the heat conduction solid rod is fixedly connected with the heat conduction porous rod.
(7) The extroversion leads to the pole include with interior bloated oil storage ball fixed connection's outer thorn pole and the fixed interior heat conduction pole that runs through the interior bloated oil storage ball, interior heat conduction pole one end is located outer thorn pole, the interior heat conduction pole other end extends to in the interior bloated oil storage ball, interior heat conduction pole is used for the heat conduction, make the gaseous speed that overflows of outer thorn pole department be less than the speed of gas expansion, be convenient for on the one hand outer thorn pole inflation sclerosis with higher speed, thereby reduce its degree of difficulty of punctureing the rubber diaphragm, on the other hand, when outer thorn pole constantly expands greatly, micropore on it constantly increases, the molecule of the conduction oil of being convenient for spills over from extroversion leads to the pole.
Drawings
FIG. 1 is a schematic diagram of the main process of the present invention;
FIG. 2 is a schematic structural view of a homogenizing heat-conducting mesh according to the present invention;
FIG. 3 is a schematic view of the structure at discrete ball points of the present invention;
FIG. 4 is a schematic structural diagram of a reverse overflow ball portion of the present invention;
FIG. 5 is a schematic view of the structure at A in FIG. 4;
FIG. 6 is a schematic view of the construction of an outward through rod of the present invention;
fig. 7 is a schematic structural diagram of embodiment 2 of the present invention.
The reference numbers in the figures illustrate:
1 homogenizing heat-conducting net, 11 hollow connecting wires, 12 reverse overflow balls, 2 discrete ventilation frames, 22 ventilation rods, 21 discrete ball points, 211 directional hemispheres, 212 dynamic hemispheres, 3 through holes, 31 rubber membranes, 32 hot-melt sealing layers, 41 heat-conducting solid rods, 42 heat-conducting porous rods, 5 internal expansion oil-storing balls, 6 external through rods, 61 external barbed rods and 62 internal heat-conducting rods.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1, a hot-reversal type metal powder sintering process includes the following steps:
s1, firstly, selecting metal powder meeting the requirement of the particle size according to the requirement, wherein a in the figure represents the metal powder;
s2, uniformly covering and filling the metal powder into the homogenization heat conduction net 1, pressing and forming, and then mutually adsorbing and connecting the lower ends of the homogenization heat conduction net 1 corresponding to the discrete ventilation frames 2;
s3, performing thermal reverse treatment before sintering, namely introducing high-temperature inert gas into the homogenized heat conduction net 1 through the discrete gas introducing frame 2, wherein the high-temperature inert gas enables heat conduction oil in the homogenized heat conduction net 1 to reversely overflow from inside to outside along with the high-temperature inert gas and uniformly disperse into the formed metal powder, and the temperature of the high-temperature inert gas is not lower than 300 ℃;
and S4, high-temperature sintering, namely separating the metal powder formed in the previous step from the discrete ventilation frame 2, then lowering the metal powder into a sintering furnace, performing high-temperature sintering, reducing the temperature difference between the inside and the outside of the metal powder under the action of heat conduction oil, meanwhile, enabling the heat conduction oil to show gaseous micromolecules to overflow at high temperature, and assisting in pore forming to obtain a porous metal finished product which is uniformly sintered, wherein b in the figure represents the porous metal finished product.
Referring to fig. 2, the homogenized heat conducting net 1 includes a plurality of hollow continuous wires 11 intersecting with each other and a plurality of reverse overflow balls 12 connected to intersections of the hollow continuous wires 11, the discrete vent frame 2 includes a plurality of vent bars 22 and discrete ball points 21, the discrete ball points 21 and the vent bars 22 are fixedly connected, the discrete ball points 21 are fixedly connected to intersections of the hollow continuous wires 11 at the bottom, the vent bars 22, the discrete ball points 21, the hollow continuous wires 11 and the reverse overflow balls 12 are communicated with each other, and the four are made of heat conducting materials, so that the homogenized heat conducting net 1 and the discrete vent frame 2 are communicated with each other, thereby effectively ensuring that introduced high-temperature inert gas can be uniformly dispersed into press-formed metal powder, and making the internal and external sintering degree of the metal powder more uniform during sintering forming, thereby effectively improving quality and strength of finished products.
Referring to fig. 3, the discrete sphere point 21 includes a directional hemisphere 211 fixedly connected to the hollow connecting wire 11 and a moving hemisphere 212 fixedly connected to the ventilation rod 22, and one end of the directional hemisphere 211 close to the moving hemisphere 212 is fixedly connected to a magnetic ring, and the two magnetic rings are mutually attracted, so as to facilitate connection and detachment between the homogenization heat conduction net 1 and the discrete ventilation frame 2, so that the formed metal powder can be separated from the discrete ventilation frame 2 before sintering, and further, the discrete ventilation frame 2 can be reused, thereby effectively reducing the investment of production cost.
Referring to fig. 4, an inner expansion oil storage ball 5 is placed inside a reverse overflow ball 12, heat conducting oil and bubbles wrapped with inert gas are filled inside the inner expansion oil storage ball 5, c in the figure represents the bubbles wrapped with inert gas, a plurality of evenly distributed outward through rods 6 are fixedly connected to the outer end of the inner expansion oil storage ball 5, a plurality of evenly distributed through holes 3 are cut on the reverse overflow ball 12, rubber diaphragms 31 are fixedly connected to the outward orifices of the through holes 3, the through holes 3 are matched with the outward through rods 6, a heat conduction limiting rod is embedded at one end of a hollow connecting wire 11 close to the reverse overflow ball 12, the heat conduction limiting rod comprises a heat conduction porous rod 42 located in the hollow connecting wire 11 and a heat conduction solid rod 41 extending into the inner expansion oil storage ball 5, the heat conduction solid rod 41 is fixedly connected with the heat conduction porous rod 42, the heat conduction limiting rod penetrates through the reverse overflow ball 12 and the inner expansion oil storage ball 5 and extends into the inner expansion oil storage ball 5, when high-temperature inert gas is introduced, the high-temperature inert gas can enter the reverse overflow ball 12 along the hollow connecting wire 11, under the action of the heat conduction limiting rod, heat can be quickly guided into the inner expansion oil storage ball 5, so that the inert gas wrapped in the inner expansion oil storage ball 5 is continuously expanded to generate burst, on one hand, the fluidity of the heat conduction oil is accelerated, so that the temperature change of the heat conduction oil is more uniform, when the heat conduction oil is dispersed into metal powder, the uniformity of the integral temperature of the metal powder is effectively ensured, the inner uniformity and the outer uniformity are higher during sintering, on the other hand, the inner expansion oil storage ball 5 can be continuously expanded, the outer through rod 6 can be embedded into the through hole 3, the through hole 3 is punctured, meanwhile, the outer through rod 6 extends out of the reverse overflow ball 12, the permeability between the inner expansion oil storage ball 5 and the formed metal powder is realized, and the overflow of the heat conduction oil is convenient, the thermal conductivity limiting rod can also limit the internal expansion oil storage ball 5, so that the internal expansion oil storage ball is not easy to shift when expanding, and the external through rod 6 can conveniently enter the through hole 3.
Referring to fig. 5-6, the outward through rod 6 includes an outer prick rod 61 fixedly connected to the inner expansion oil storage ball 5 and an inner heat conducting rod 62 fixedly penetrating the inner expansion oil storage ball 5, one end of the inner heat conducting rod 62 is located in the outer prick rod 61, the other end of the inner heat conducting rod 62 extends into the inner expansion oil storage ball 5, the outer prick rod 61 is of a microporous structure, the outer prick rod 61 is communicated with the inner expansion oil storage ball 5, and the inner heat conducting rod 62 is used for conducting heat, so that the gas overflowing speed at the outer prick rod 61 is lower than the gas expanding speed, on one hand, the expansion hardening of the outer prick rod 61 is facilitated, thereby reducing the difficulty of the outer prick rod 31, on the other hand, when the outer prick rod 61 continuously expands, micropores thereon are continuously increased, thereby facilitating the molecules of the heat conducting oil to overflow from the outward through rod 6.
Through the arrangement of the homogenization heat conduction net 1 and the discrete ventilation frame 2, high-temperature inert gas can be introduced into the homogenization heat conduction net 1 before sintering, the heat reverse treatment is carried out on the pressed and formed metal powder, the homogenization heat conduction net 1 is heated to cause the expansion of the internal expansion oil storage ball 5, the outward through rod 6 extends out of the reverse overflow ball 12, the permeability between the internal expansion oil storage ball 5 and the formed metal powder is realized, the heat conduction oil reversely overflows from inside to outside and is uniformly dispersed into the formed metal powder, the heating speed of the inside of the metal powder during sintering is obviously improved, the temperature difference between the inside and the outside of the metal powder is reduced, the internal and external sintering degrees of the metal powder during sintering and forming are more uniform, the quality and the strength of finished products are improved, meanwhile, the inert gas overflowing together with the heat conduction oil can achieve a certain hole expanding effect in the formed metal powder before sintering, the efficiency of pore-forming during sintering is improved.
Example 2:
referring to fig. 7, in the embodiment, the heat conduction oil and the bubbles wrapped with the inert gas are directly filled in the reverse overflow ball 12, and the through hole 3 is filled with the hot-melt sealing layer 32, so that the heat conduction oil and the bubbles wrapped with the inert gas are sealed, when the high-temperature inert gas is introduced, the hot-melt sealing layer 32 is heated and dissolved, so that the through hole 3 is through from inside to outside, and at the moment, the heat conduction oil and the inert gas overflow into the formed metal powder together.
The above is a difference between this embodiment and embodiment 1, and other parts are consistent with embodiment 1, this embodiment is suitable for a product with relatively low requirement on strength of a porous metal finished product after sintering metal powder, and accordingly, the production cost of this embodiment is lower than that of embodiment 1, while embodiment 1 is suitable for a product with relatively high requirement on strength of a porous metal finished product, and during production, an implementation manner may be selected according to needs.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (9)
1. A hot reversal type metal powder sintering process is characterized in that: the method comprises the following steps:
s1, firstly, selecting metal powder meeting the requirement of the particle size according to the requirement;
s2, uniformly covering and filling the metal powder into the homogenization heat conduction net (1), pressing and forming, and then mutually adsorbing and connecting the lower ends of the homogenization heat conduction net (1) corresponding to the discrete ventilation frames (2);
s3, performing thermal reverse treatment before sintering, namely introducing high-temperature inert gas into the homogenized heat conduction net (1) through the discrete gas-introducing frame (2), wherein the high-temperature inert gas enables heat conduction oil in the homogenized heat conduction net (1) to reversely overflow from inside to outside along with the high-temperature inert gas and uniformly disperse into the formed metal powder;
and S4, high-temperature sintering, namely separating the metal powder formed in the last step from the discrete ventilation frame (2), then lowering the metal powder into a sintering furnace, performing high-temperature sintering, reducing the temperature difference between the inside and the outside of the metal powder under the action of heat conduction oil, meanwhile, enabling the heat conduction oil to show gaseous micromolecules to overflow at high temperature, and forming holes in an auxiliary manner to obtain a porous metal finished product which is uniformly sintered.
2. The hot-reversal metal powder sintering process of claim 1, wherein: the temperature of the high-temperature inert gas in the S3 is not lower than 300 ℃.
3. The hot-reversal metal powder sintering process of claim 1, wherein: the homogenization heat conduction net (1) comprises a plurality of hollow continuous wires (11) which are mutually crossed and a plurality of reverse overflow balls (12) which are respectively connected at the crossed positions of the hollow continuous wires (11), the discrete ventilation frame (2) comprises a plurality of ventilation rods (22) and discrete ball points (21), the discrete ball points (21) are fixedly connected with the ventilation rods (22), and the discrete ball points (21) are respectively and fixedly connected with the crossed positions of the plurality of hollow continuous wires (11) at the lowest position.
4. The hot-backward metal powder sintering process of claim 3, wherein: the ventilation rod (22), the discrete ball points (21), the hollow connecting wire (11) and the reverse overflow ball (12) are communicated with each other, and the ventilation rod, the discrete ball points (21), the hollow connecting wire and the reverse overflow ball are all made of heat conduction materials.
5. The hot-backward metal powder sintering process of claim 4, wherein: the discrete sphere point (21) comprises a directional hemisphere (211) fixedly connected with the hollow connecting wire (11) and a moving hemisphere (212) fixedly connected with the ventilation rod (22), magnetic rings are fixedly connected to one ends, close to each other, of the directional hemisphere (211) and the moving hemisphere (212), and the two magnetic rings are mutually adsorbed.
6. The hot-reversal metal powder sintering process of claim 1, wherein: the oil storage ball with the internal expansion is arranged inside the reverse overflow ball (12), heat conduction oil is filled inside the oil storage ball with the internal expansion (5), bubbles of inert gas are wrapped on the bubbles, a plurality of evenly distributed outward through rods (6) are fixedly connected to the outer end of the oil storage ball with the internal expansion (5), a plurality of evenly distributed through holes (3) are formed in the reverse overflow ball (12), rubber membranes (31) are fixedly connected to the outward hole openings of the through holes (3), the through holes (3) are matched with the outward through rods (6), a heat conduction limiting rod is embedded at one end, close to the reverse overflow ball (12), of the hollow connecting wire (11), and the heat conduction limiting rod penetrates through the reverse overflow ball (12) and the oil storage ball with the internal expansion (5) and extends into the oil storage ball with the internal expansion (5).
7. The hot-backward metal powder sintering process of claim 6, wherein: the heat conduction limiting rod comprises a heat conduction porous rod (42) located in a hollow connecting wire (11) and a heat conduction solid rod (41) extending into the internal expansion oil storage ball (5), and the heat conduction solid rod (41) is fixedly connected with the heat conduction porous rod (42).
8. The hot-backward metal powder sintering process of claim 6, wherein: the outside leads to pole (6) and includes with interior bloated outer thorn pole (61) of oil storage ball (5) fixed connection and fixed interior heat conduction pole (62) that run through interior bloated oil storage ball (5), interior heat conduction pole (62) one end is located outer thorn pole (61), interior heat conduction pole (62) other end extends to in bloated oil storage ball (5).
9. The hot-backward metal powder sintering process of claim 8, wherein: the outer thorn rod (61) is of a microporous structure, and the outer thorn rod (61) is communicated with the inner expansion oil storage ball (5).
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