CN111151743B - High-temperature die with graphite-low-temperature alloy-steel coupling heat transfer mode - Google Patents
High-temperature die with graphite-low-temperature alloy-steel coupling heat transfer mode Download PDFInfo
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- CN111151743B CN111151743B CN202010114258.XA CN202010114258A CN111151743B CN 111151743 B CN111151743 B CN 111151743B CN 202010114258 A CN202010114258 A CN 202010114258A CN 111151743 B CN111151743 B CN 111151743B
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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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Abstract
The invention discloses a high-temperature die with a graphite-low-temperature alloy-steel coupling heat transfer mode, which belongs to the field of die manufacture, and comprises a part manufacturing system and a heat preservation system, wherein the part manufacturing system comprises a graphite die, a low-melting-point alloy, a steel die sleeve and a bottom die, and the low-melting-point alloy is filled in an annular gap between the graphite die and the steel die sleeve; the low-melting-point alloy wraps the outer surface of the graphite mold, so that oxygen is isolated, the high-temperature oxidation resistance of the graphite mold is improved, the oxidation speed of the graphite mold is reduced, and the service life of the graphite mold is prolonged; the heated liquid low-melting-point alloy provides a variable space for the expansion and deformation of the steel die sleeve and the graphite die, and the cooling shrinkage process is the same as the heating process before the solidification of the low-melting-point alloy. The heat preservation system is sleeved outside the part manufacturing system, the part manufacturing system is insulated, heat loss is reduced, energy utilization rate is improved, electricity consumption is reduced, and part processing cost is reduced.
Description
Technical Field
The invention belongs to the field of die manufacturing, and particularly relates to a high-temperature die with a graphite-low-temperature alloy-steel coupling heat transfer mode.
Background
With the development of modern industrial technology, the die has an irreplaceable role in machine part processing, especially in various processing and molding technologies, such as: the auxiliary molding of the die is needed for hot press molding, die casting molding, extrusion molding and the like. Graphite has become a special industrial material because of its good electrical and thermal conductivity, self-wetting and high mechanical strength. However, graphite is extremely easy to oxidize at high temperature, and oxidation is accelerated from 450 ℃ to 750 ℃, so that oxidation corrosion is extremely accelerated. The sintering temperature of the diamond drill bit is 950-1100 ℃, so that the graphite mould for manufacturing the drill bit is easy to oxidize, the mechanical properties of the graphite mould in all aspects are weakened after oxidation, and the service life of the graphite mould is greatly reduced.
At present, the service life of a graphite mold is prolonged by improving the oxidation resistance of the graphite mold, and the graphite mold is widely studied in the industry. Such as: zhang Jiakui et al propose to increase its oxidation resistance by varying the content of graphite and adding other elements. The mold material comprises 15-25% of asphalt, 3-5% of silicon nitride, 0.3-0.8% of titanium nitride, 0.1-0.5% of yttrium and 0.1-0.5% of erbium by weight percent; the balance being graphite. Kneading the graphite in a kneader, and finally reshaping, wherein the oxidation resistance is improved by changing the original graphite structure. In addition, the service life of graphite is prolonged through a physical method, the long-life hollow graphite die comprises a base, an outer film and an inner film, wherein the inner film is sleeved inside the outer film, the bottoms of the inner film and the outer film are connected with the upper part of the integrally formed base, cover plates are arranged above the inner film and the outer film, the outer side of the outer film is respectively wrapped with a first protection plate and a second protection plate, the first protection plate and the second protection plate are fixedly connected with a protection device, and the protection device is provided with a sleeve rod, a sleeve barrel, a spring and the like. The mold is mainly divided into an inner film and an outer film, silicon carbide films are plated on the outer side of the inner film and the inner side of the outer film, and the service life of the mold is prolonged by utilizing the high-temperature resistance and oxidation resistance of the silicon carbide films.
The essence of the two methods is that the graphite material is blocked from contacting oxygen in air at high temperature, complex manufacturing processes are respectively adopted, and the manufacturing cost is relatively high. Therefore, how to isolate the graphite mold from oxygen at high temperature by adopting a simple manufacturing process is a problem to be solved.
Disclosure of Invention
Aiming at the problems that a graphite mold is easy to oxidize at high temperature and has short service life, the invention aims to provide the high-temperature mold in a graphite-low-temperature alloy-steel coupling heat transfer mode, which blocks the contact between the outer diameter surface of graphite and oxygen in air, reduces the oxidation speed of a graphite layer on the outer surface of the graphite mold, even does not fall off the graphite layer, enables the graphite mold to be recycled and reduces the production cost of the mold.
The technical scheme adopted by the invention for achieving the purpose is as follows: a high temperature die of a graphite-low temperature alloy-steel coupled heat transfer mode, comprising: the part manufacturing system comprises a graphite die, a low-melting-point alloy, a steel die sleeve and a bottom die, wherein the graphite die is arranged in the steel die sleeve and is coaxial with the steel die sleeve, an annular gap is formed between the outer wall of the graphite die and the inner wall of the steel die sleeve, and the upper part of the outer wall of the graphite die and the upper part of the inner wall of the steel die sleeve are inclined surfaces which incline outwards gradually from bottom to top to form a dovetail groove type accommodating space with wide upper part and narrow lower part; the lower part of the inner wall of the steel die sleeve protrudes inwards along the radial direction to form an annular bulge, the lower part of the outer wall of the graphite die is of a stepped structure, and the stepped surface of the stepped structure is abutted against the annular bulge; the inner wall of the bottom die is in threaded connection with the lower part of the outer wall of the graphite die, the outer wall of the bottom die is in threaded connection with the annular bulge of the steel die sleeve, and a bottom die screwing and unscrewing hole is formed in the bottom die; the low-melting-point alloy is filled in an annular gap between the graphite die and the steel die sleeve; the heat preservation system suit is in part manufacturing system's outside, heat preservation system includes high temperature resistant heat preservation lid, high temperature resistant heat preservation cover and high temperature resistant heat preservation backing plate, high temperature resistant heat preservation cover is the open hollow structure in upper and lower both ends, infrared ray temperature measurement hole has been seted up on the lateral wall of high temperature resistant heat preservation cover, infrared ray temperature measurement hole is the through-hole, high temperature resistant heat preservation lid is provided with to upper portion open department detachably of high temperature resistant heat preservation cover, lower part open department detachably of high temperature resistant heat preservation cover is provided with high temperature resistant heat preservation backing plate, high temperature resistant heat preservation lid and high temperature resistant heat preservation backing plate all with high temperature resistant heat preservation cover sealing connection.
Further, the inclined surface has an inclination angle of 30 0-600 and a height of 3mm to 30mm.
As a preferable embodiment of the present invention, the inclination angle of the inclined surface is 45 0 and the height is 10mm.
Preferably, the low melting point alloy is wood's alloy or tin.
Further, the steel die sleeve has a temperature resistance at least 100 ℃ higher than the temperature required for the sample to be sintered.
Further, the diameter of the bottom die is at least 3mm smaller than the diameter of the graphite die.
Through the design scheme, the invention has the following beneficial effects: the invention provides a high-temperature die in a graphite-low-temperature alloy-steel coupling heat transfer mode, which improves the original graphite die, increases a low-melting-point alloy, a steel die sleeve and a heat preservation system, prevents the outer surface of the graphite die from being contacted with oxygen in air, increases the oxidation resistance of the graphite die, reduces the oxidation speed of the graphite die, reduces the heat loss of a part manufacturing system by the heat preservation system, improves the energy utilization rate, and reduces the part manufacturing cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application, wherein:
FIG. 1 is a schematic axial cross-section of a high temperature die of the graphite-low temperature alloy-steel coupled heat transfer mode of an embodiment of the present invention;
FIG. 2 is a schematic diagram of an axial section of a high-temperature die in a graphite-low temperature alloy-steel coupling heat transfer mode along an infrared temperature measuring hole according to an embodiment of the invention.
The figures are marked as follows: 1-graphite mold; 2-low melting point alloy; 3-steel die sleeve; 4-bottom die; 5-a high-temperature resistant heat preservation cover; 6-high temperature resistant insulation sleeve; 7-a high-temperature resistant heat-preserving backing plate; 8-an infrared temperature measuring hole; 9-screwing and unscrewing the hole of the bottom die.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments and the accompanying drawings. Those skilled in the art will appreciate that. The following detailed description is illustrative and not restrictive, and should not be taken as limiting the scope of the invention.
As shown in fig. 1 and fig. 2, the high-temperature mold of the graphite-low temperature alloy-steel coupling heat transfer mode provided by the invention adopts a physical method to improve the high-temperature oxidation resistance of the graphite mold 1 and reduce the high-temperature oxidation speed of the graphite mold 1, and the mold comprises a part manufacturing system and a heat preservation system, wherein the part manufacturing system is responsible for manufacturing parts at high temperature, the heat preservation system is responsible for preserving heat, preventing heat loss, reducing heating time, reducing electricity consumption and reducing the part processing cost. The part manufacturing system comprises a graphite die 1, a low-melting-point alloy 2, a steel die sleeve 3 and a bottom die 4, wherein the graphite die 1 is coaxially arranged in the steel die sleeve 3, an annular gap is formed between the outer wall of the graphite die 1 and the inner wall of the steel die sleeve 3, the upper part of the outer wall of the graphite die 1 and the upper part of the inner wall of the steel die sleeve 3 are inclined surfaces which incline gradually outwards from bottom to top to form a dovetail groove type containing space with wide upper part and narrow lower part, the inclined angle of the inclined surfaces is 30 0-600, the height is 3mm-30mm, preferably, the inclined angle of the inclined surfaces is 45 0, the height is 10mm, the lower part of the inner wall of the steel die sleeve 3 protrudes inwards in the radial direction to form an annular bulge, the lower part of the outer wall of the graphite die 1 is of a stepped structure, and the stepped surface of the stepped structure is abutted against the annular bulge; the inner wall of the bottom die 4 is in threaded connection with the lower part of the outer wall of the graphite die 1, the outer wall of the bottom die 4 is in threaded connection with the annular bulge of the steel die sleeve 3, and a bottom die screwing-off hole 9 is formed in the bottom die 4 and is used for facilitating screwing-off of the bottom die 4; the low-melting-point alloy 2 is filled in an annular gap between the graphite die 1 and the steel die sleeve 3. The heat preservation system is sleeved outside the part manufacturing system, the heat preservation system comprises a high-temperature resistant heat preservation cover 5, a high-temperature resistant heat preservation sleeve 6 and a high-temperature resistant heat preservation base plate 7, the high-temperature resistant heat preservation sleeve 6 is of a hollow structure with two open ends, an infrared temperature measuring hole 8 is formed in the side wall of the high-temperature resistant heat preservation sleeve 6, the infrared temperature measuring hole 8 is a through hole, the high-temperature resistant heat preservation cover 5 is detachably arranged at the upper opening of the high-temperature resistant heat preservation sleeve 6, the high-temperature resistant heat preservation base plate 7 is detachably arranged at the lower opening of the high-temperature resistant heat preservation sleeve 6, the high-temperature resistant heat preservation cover 5 and the high-temperature resistant heat preservation base plate 7 are in sealing connection with the high-temperature resistant heat preservation sleeve 6, and the high-temperature resistant heat preservation cover 5 and the high-temperature resistant heat preservation base plate 7 are used for sealing the high-temperature resistant heat preservation sleeve 6 up and down.
Wherein, the material and volume of the low-melting-point alloy 2 are determined together according to the heating temperature of the sample to be sintered, the expansion coefficients of the steel die sleeve 3 and the graphite die 1, and the annular clearance between the steel die sleeve 3 and the graphite die 1, such as wood alloy, tin and the like. The low-melting-point alloy 2 is filled between the graphite die 1 and the steel die sleeve 3, and the low-melting-point alloy 2 is a material with low melting point, high boiling point, good thermal conductivity and small thermal expansion coefficient. The function of filling the low-melting-point alloy 2 in the annular gap between the graphite die 1 and the steel die sleeve 3 is as follows: firstly, the thermal expansion coefficient of graphite is 1.6X10 -6 ℃, the thermal expansion coefficient of steel is 1.2X10 -5 ℃, the difference between the thermal expansion coefficients of graphite and steel is larger, if a graphite die 1 and a steel die sleeve 3 are directly nested and matched with seamless connection, when parts are manufactured and heated, the steel and the graphite expand simultaneously and shrink after cooling, the cooling shrinkage speed is different due to the larger difference of the expansion coefficients, and finally the steel extrudes and breaks the graphite after different thermal deformation. A shrinkage gap is reserved between the graphite mold 1 and the steel form 3, air is generated in the gap, and the graphite is oxidized when contacting with the air, so that the low-melting-point alloy 2 is filled in the shrinkage gap. The low-melting-point alloy 2 is melted at a lower temperature (about 200 ℃), the expansion speed of graphite and steel is low at the temperature, the expansion amount is small, and the low-melting-point alloy 2 becomes liquid after being melted, so that a variable space is provided for expansion, cooling contraction and deformation of the graphite and the steel; secondly, the low-melting-point alloy 2 has good heat conductivity, so that the heated heat can be transferred to the graphite mold 1, and the heat loss in the heat transfer process is reduced; thirdly, the service life of the graphite mold 1 can be prolonged by the steel mold sleeve 3 and the low-melting-point alloy 2, but when the graphite mold 1 cannot be used continuously any more after the service life is finished, the graphite mold 1 can be taken out after the low-melting-point alloy 2 is heated and melted, and the graphite mold 1 is easy to replace due to the low-melting-point alloy 2; fourth, the basement membrane 4 adopts threaded connection with steel die cover 3, and basement membrane 4 is located graphite mould 1 below simultaneously, and basement membrane 4 adopts threaded connection with graphite mould 1, and threaded connection makes graphite mould 1, steel die cover 3 and die block 4 concentricity relatively poor, and low melting point alloy 2's existence has compensatied the relatively poor shortcoming of concentricity.
Wherein, the material of steel mould cover 3 is according to the temperature determination of waiting the sintering sample, and the size of steel mould cover 3 is according to graphite mould 1's size determination. The steel die sleeve 3 has a temperature resistance at least 100 ℃ higher than the temperature required for the sample to be sintered.
The bottom die 4 is determined according to the size of the graphite die 1, and the diameter of the bottom die 4 is at least 3mm smaller than the diameter of the graphite die 1, so that the graphite die 1 is completely contacted with the steel die sleeve 3 to achieve the sealing degree, and the liquid low-melting-point alloy 2 cannot flow out from the thread between the bottom die 4 and the steel die sleeve 3. The thickness of the bottom die 4 is determined according to the specific situation.
The high temperature resistant heat insulation cover 5, the high temperature resistant heat insulation sleeve 6 and the high temperature resistant heat insulation base plate 7 are made of high temperature resistant heat insulation materials, such as asbestos, high temperature resistant heat insulation cotton and the like, and have excellent heat insulation, high temperature resistance, insulativity and plasticity. The heat preservation system is sleeved outside the part manufacturing system, and the part manufacturing system is well wrapped, so that heat dissipation is prevented when the part manufacturing system is heated, the heat utilization rate is improved, the heat loss is reduced, and the heating and heat preservation time is shortened. The infrared temperature measuring holes 8 on the high-temperature resistant insulation sleeve 6 can directly measure the temperature of the part manufacturing system through the infrared temperature measuring holes 8 and the infrared thermometer, so that the temperature of the part manufacturing system is accurately controlled, and the success rate of part manufacturing is increased. The heat preservation system greatly reduces the heat loss of the part manufacturing system, improves the energy utilization rate, reduces the heating cost and reduces the part manufacturing cost.
The high-temperature die in the graphite-low-temperature alloy-steel coupling heat transfer mode is heated by a high-frequency furnace (heating tool), after the graphite die 1 in the part manufacturing system is filled with materials, the part manufacturing system is directly wrapped by a heat preservation system, the part manufacturing system is placed into a coil in the high-frequency furnace, the coil vibrates, and the heat preservation system has the insulativity that the part manufacturing system is not involved in heating, so that the part manufacturing system only has a heat preservation effect.
The graphite mold 1 is wrapped by the low-melting-point alloy 2, and the low-melting-point alloy 2 is in a liquid state after heating, for example, when the diamond drill bit is manufactured and heated to 950 ℃ -1100 ℃, the low-melting-point alloy 2 does not reach the boiling point, bubbles are not generated without boiling, oxygen is not generated without bubbles, direct contact between the oxygen and graphite is not generated, and the graphite mold 1 is not oxidized at high temperature or even if the graphite is oxidized, the oxidation speed of the graphite is greatly reduced. The low-melting-point alloy 2 expands after being heated and melted at high temperature, but the volume of expansion is smaller, a dovetail groove type containing space with the upper part being wide at the upper part and the lower part being narrow is formed at the upper part of the steel mould sleeve 3, the expanded low-melting-point alloy 2 can be contained, cooling forming can be carried out after the heating and manufacturing of the part are completed, the cooled low-melting-point alloy 2 is cooled and contracted, and the annular gap between the inner wall of the graphite mould sleeve 1 and the outer wall of the steel mould sleeve 3 can be retracted when the cooled and contracted low-melting-point alloy 2 which is expanded and remained in the dovetail groove type containing space. The whole heating, heat preservation and cooling processes change the low melting point alloy 2 in a dynamic change process. Of course, the specific case is as follows: when tin is selected as the low-melting-point alloy 2, the volume of the tin is determined according to the thermal expansion coefficient of the tin, the annular gap between the steel die sleeve 3 and the graphite die 1 and the thermal expansion coefficient of the steel die sleeve 3 and the graphite die 1, so that the whole dovetail-groove-shaped accommodating space is just filled after the tin is heated and expanded, the oxidation speed of graphite is extremely high at high temperature, so that the outer surface of the graphite die 1 can be completely wrapped by the tin after the graphite is heated, oxygen is completely isolated, the high-temperature oxidation speed of the graphite is reduced, the liquid tin can be reduced very little due to the existence of the dovetail-groove-shaped accommodating space after the temperature is reduced, and the oxidation speed of the graphite die 1 is also reduced after the temperature is reduced. In conclusion, the existence of the low-melting-point alloy 2 isolates oxygen, reduces the oxidation speed of graphite, and prolongs the service life of the outer surface of the graphite. The inner surface of the graphite mold 1 is in contact with the sample to be sintered, and the principle is consistent with the protection mechanism of the outer surface of the graphite mold 1 and the low-melting-point alloy 2.
Working principle:
The high-temperature die with the graphite-low-temperature alloy-steel coupling heat transfer mode provided by the invention has three working principles: firstly, the low-melting-point alloy 2 is adopted to isolate the contact between the graphite die 1 and oxygen, so that the high-temperature oxidation resistance of graphite is increased, the oxidation speed of graphite is reduced, and the service life of the graphite die 1 is prolonged. Secondly, the low-melting-point alloy 2 solves the problem that the steel die sleeve 3 is in cooling shrinkage and fracturing of the graphite die 1 due to the direct contact of the steel die sleeve 3 and the graphite die 1. The existence of the low-melting-point alloy 2 provides a variable space for the thermal expansion of the steel die sleeve 3 and the graphite die 1, even if the difference of the thermal expansion coefficients is large, the steel die sleeve 3 and the graphite die 1 can be heated and expanded only after being heated at high temperature, the low-melting-point alloy 2 is in a liquid state after being heated, the liquid low-melting-point alloy 2 has fluidity, so that the steel die sleeve 3 and the graphite die 1 have buffer spaces, and the problem of fracturing of the graphite die 1 under the shrinkage force of the steel die sleeve 3 is solved. The heat preservation system is made of high-temperature resistant insulating materials, such as asbestos, high-temperature resistant insulating cotton and the like, has good heat preservation performance, high temperature resistance, good insulativity and strong plasticity, can be changed at will according to the shape of the part manufacturing system, reduces heat loss, increases energy utilization rate, and reduces part manufacturing cost.
Referring to fig. 1 and 2, the working process of the high-temperature die in the graphite-low temperature alloy-steel coupling heat transfer mode provided by the invention can be divided into three stages, wherein the first stage is a heating process, the steel die sleeve 3 and the graphite die 1 expand simultaneously in the heating process, at the moment, the low-melting-point alloy 2 is melted in the heating process, the flowability of the liquid low-melting-point alloy 2 provides a variable space for the expansion of the steel die sleeve 3 and the graphite die 1, the expansion coefficient of the steel die sleeve 3 is large, the expansion coefficient of the graphite die 1 is small, the solid state of the low-melting-point alloy 2 is changed into the liquid volume to be increased, the liquid level of the liquid low-melting-point alloy 2 rises or falls in a dovetail groove-shaped accommodating space under the combined action of the three stages, and the liquid level changes according to different materials of the low-melting-point alloy 2. The upper width and the lower width of the dovetail groove shape make the liquid level of the liquid low-melting-point alloy 2 not greatly changed. The liquid low-melting-point alloy 2 can well wrap the outer surface of the graphite mold 1 in the whole heating process, can play a role in well isolating oxygen, so that graphite is not easy to oxidize at high temperature or the oxidation speed is reduced; the second stage is a heat preservation stage, a heat preservation process which needs a period of time in the processing process of manufacturing parts such as diamond drills and the like is the first stage, namely the pole of the heating process, and the states of the steel die sleeve 3, the graphite die 1, the low-melting-point alloy 2 and the like are not changed at the moment, so that a stable state is maintained; the third stage is a cooling stage, the cooling stage is the reverse process of the heating stage, the steel die sleeve 3 and the graphite die 1 start to shrink in the process of temperature reduction, but the steel die sleeve 3 generates great shrinkage force when the shrinkage speed is different, but the low-melting-point alloy 2 is still in a liquid state at the moment, so that a buffer space is provided for the steel die sleeve 3 and the graphite die 1, and the possibility of graphite fracturing does not occur. When the temperature is lowered to about 200 ℃, the low-melting-point alloy 2 starts to be in a liquid state to be in a solid state, but at this time, the cooling shrinkage and deformation of the steel die sleeve 3 and the graphite die 1 are basically kept unchanged, so that the whole structure is basically not affected. In all three stages, the low-melting-point alloy 2 wraps the graphite mold 1, so that the low-melting-point alloy is not contacted with oxygen, the oxidation speed is reduced, the high-temperature oxidation resistance is improved, and the service life of the graphite mold 1 is prolonged.
After the traditional diamond bit graphite die is used for manufacturing a bit, the outer surface of the graphite die is seriously oxidized at high temperature to be scrapped, the invention enables the outer surface of the graphite die 1 to isolate oxygen, increases high-temperature oxidation resistance, reduces oxidation speed at high temperature, enables the graphite die to be continuously used after the diamond bit is manufactured, and enables the appearance of the die to be basically unchanged. When the inner surface of the graphite mold 1 is oxidized to be incapable of being used or the size of the graphite mold is not accurate enough, the graphite mold 1 can be broken by screwing and unscrewing the bottom mold 4 to be disassembled, the steel mold sleeve 3 and the low-melting-point alloy 2 are continuously used, and a new graphite mold 1 is replaced.
The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.
Claims (6)
1.A high temperature die of a graphite-low temperature alloy-steel coupled heat transfer mode, comprising: the part manufacturing system comprises a graphite mold (1), a low-melting-point alloy (2), a steel mold sleeve (3) and a bottom mold (4), wherein the graphite mold (1) is arranged in the steel mold sleeve (3) and is coaxial with the steel mold sleeve, an annular gap is reserved between the outer wall of the graphite mold (1) and the inner wall of the steel mold sleeve (3), and the upper part of the outer wall of the graphite mold (1) and the upper part of the inner wall of the steel mold sleeve (3) are inclined surfaces which incline outwards gradually from bottom to top to form a dovetail groove-shaped containing space with wide upper part and narrow lower part; the lower part of the inner wall of the steel die sleeve (3) protrudes inwards along the radial direction to form an annular bulge, the lower part of the outer wall of the graphite die (1) is of a stepped structure, and a stepped surface of the stepped structure is abutted against the annular bulge; the inner wall of the bottom die (4) is in threaded connection with the lower part of the outer wall of the graphite die (1), the outer wall of the bottom die (4) is in threaded connection with the annular bulge of the steel die sleeve (3), and a bottom die screwing-out hole (9) is formed in the bottom die (4); the low-melting-point alloy (2) is filled in an annular gap between the graphite die (1) and the steel die sleeve (3); the heat preservation system suit is in part manufacturing system's outside, heat preservation system includes high temperature resistant heat preservation lid (5), high temperature resistant heat preservation cover (6) and high temperature resistant heat preservation backing plate (7), high temperature resistant heat preservation cover (6) are upper and lower both ends open hollow structure, infrared ray temperature measurement hole (8) have been seted up on the lateral wall of high temperature resistant heat preservation cover (6), infrared ray temperature measurement hole (8) are the through-hole, upper portion open department detachably of high temperature resistant heat preservation cover (6) is provided with high temperature resistant heat preservation lid (5), lower part open department detachably of high temperature resistant heat preservation cover (6) is provided with high temperature resistant heat preservation backing plate (7), high temperature resistant heat preservation lid (5) and high temperature resistant heat preservation backing plate (7) all with high temperature resistant heat preservation cover (6) sealing connection.
2. The graphite-low temperature alloy-steel coupled heat transfer mode high temperature mold of claim 1, wherein: the inclined plane has an inclination angle of 30 0-600 and a height of 3mm-30mm.
3. The graphite-low temperature alloy-steel coupled heat transfer mode high temperature mold of claim 1, wherein: the inclined surface has an inclination angle of 45 0 and a height of 10mm.
4. The graphite-low temperature alloy-steel coupled heat transfer mode high temperature mold of claim 1, wherein: the low-melting-point alloy (2) is wood alloy or tin.
5. The graphite-low temperature alloy-steel coupled heat transfer mode high temperature mold of claim 1, wherein: the temperature resistance of the steel die sleeve (3) is at least 100 ℃ higher than the temperature required by the sample to be sintered.
6. The graphite-low temperature alloy-steel coupled heat transfer mode high temperature mold of claim 1, wherein: the diameter of the bottom die (4) is at least 3mm smaller than that of the graphite die (1).
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| CN204276871U (en) * | 2014-06-30 | 2015-04-22 | 南车戚墅堰机车车辆工艺研究所有限公司 | A kind of bimetallic thrust-journal plain bearing blank stand-by provision |
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