CN210999238U - Reaction sintering silicon carbide ribbed beam and special extrusion die thereof - Google Patents
Reaction sintering silicon carbide ribbed beam and special extrusion die thereof Download PDFInfo
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- CN210999238U CN210999238U CN201921658836.5U CN201921658836U CN210999238U CN 210999238 U CN210999238 U CN 210999238U CN 201921658836 U CN201921658836 U CN 201921658836U CN 210999238 U CN210999238 U CN 210999238U
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Abstract
The utility model discloses a reaction sintering carborundum ribbed beam and a special extrusion die thereof, wherein the cross section of the beam is a frame structure, a reinforced vertical rib is arranged inside the frame structure, and the vertical face bearing is changed from two vertical face bearing into three vertical face bearing; the special extrusion die comprises a die body, the die body comprises an outer die and a core die, the inner part of the outer die is of a hollow structure, the cross section of the hollow structure at the outlet end is rectangular, and the longitudinal section of the hollow structure at the inlet end is horn-shaped; one end of the core mold is a fixed end, the other end of the core mold is provided with two branches, the cross sections of the two branches are rectangular, and the bar-shaped space between the two branches forms a stud of the beam; the utility model has the advantages that: the blank body has reasonable structure, high density and uniform wall thickness; the blank is dried uniformly and does not crack; the product has high density and high bending strength; high temp. 1250 deg.C, and no deformation after long-term use.
Description
Technical Field
The utility model relates to a bearing crossbeam for the kiln car bearing girder of foamed ceramic kiln, specifically speaking are reaction sintering carborundum ribbed beam and special extrusion tooling thereof, belong to sintering carborundum bearing crossbeam field.
Background
The bearing beam is used for kiln car supports of various kilns such as electric porcelain, household porcelain, sanitary porcelain, microcrystalline glass, foamed ceramic and the like, plays an important bearing role, and various auxiliary beams, shed plates and sintered products are supported by the bearing beam to finish sintering.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to design a reaction sintering carborundum ribbed beam and special extrusion tooling thereof, the bearing crossbeam that obtains can the bearing surpass national standard 25% and use for a long time under 1250 ℃ high temperature.
The technical scheme of the utility model is that:
a reaction sintering carborundum ribbed beam, the cross section of the beam is a frame-shaped structure, a reinforcing vertical rib is arranged inside the frame-shaped structure, and the load bearing of two vertical surfaces is changed into the load bearing of three vertical surfaces; can prevent deformation and improve the structural strength.
Wherein, the crossbeam is the extrusion moulding structure.
Further, the width of the reinforcing vertical rib is 8 mm.
During production, required raw materials are mixed together, the mixture is placed into a kneader to be added with an adhesive and water for kneading, the kneaded mud-shaped material is placed into an extruder, an extrusion die is arranged at the discharge port of the extruder, and the required square beam blank is extruded out through the extrusion die under the action of the screw force of the extruder.
The special extrusion die for the reaction sintering silicon carbide ribbed beam comprises a die body, wherein the die body comprises an outer die and a core die, the inner part of the outer die is of a hollow structure, the cross section of the hollow structure at the outlet end is rectangular, and the longitudinal section of the hollow structure at the inlet end is horn-shaped, so that the addition of extruded materials is facilitated; one end of the core mold is a fixed end and is provided with a fixed thread, the other end of the core mold is provided with two branches, the cross sections of the two branches are rectangular, the bar-shaped space between the two branches forms a stud of the beam, and the beam is extruded and molded between the outer mold and the core mold.
Furthermore, the beginning of bifurcation is equipped with the extrusion material entry, the extrusion material entry is the inclined plane structure, and the width reduces gradually, and the degree of depth increases gradually, minimum width and two the interval between the bifurcation is equal.
Further, the extrusion inlet had a starting end width of 20mm and a terminal end width of 8 mm.
Furthermore, two extrusion material inlets are respectively arranged on two sides of the core mold, so that the problem of synchronous extrusion and material feeding of the peripheral ribs and the middle ribs is solved, blank cracks can be caused if the extrusion and material feeding are asynchronous, and the density of the inner ribs and the peripheral density are inconsistent.
The preparation method of the reaction sintered silicon carbide ribbed beam adopts an extrusion molding process and specifically comprises the following steps:
(1) mixing various raw materials required by reaction sintering of the silicon carbide ribbed beam together for mixing;
(2) putting the mixed materials into a kneader, adding a binder and deionized water, and kneading until the materials are kneaded into a mud shape;
(3) putting the kneaded mud-like material into a feeding bin of an extruder for extrusion, and pushing the material mud out through a die to form a beam blank under the pushing of the rotating force of a spiral shaft;
(4) roasting the extruded green body, then loading the green body into a high-temperature vacuum sintering furnace at 1750 ℃, performing high-temperature vacuum sintering to the required temperature, stopping the furnace, cooling to 300 ℃, and discharging the cooled green body out of the furnace to obtain the required finished square beam;
(5) the products discharged from the furnace are subjected to rough sand cleaning and bearing capacity test, and then are subjected to sand blasting after being ground.
The key of synchronous ejection of compact is that the mould is handled, 8 mm's muscle promptly, and 8mm is wide by 20mm wide gathering of afterbody feed end, just so can have enough material mud to extrude through the mould under the effect of the rotatory power behind the position of muscle.
The utility model discloses take extrusion moulding technology: in order to ensure that the periphery and the middle rib discharge are synchronous during extrusion, the rear part of the 8mm space of the middle rib of the die inner core is 20mm wide, the rear part is deep, and the front part is shallow, so that sufficient feeding is achieved, the middle rib and the periphery discharge are synchronous, and the density of a blank is uniform.
Further, the inner wall of the beam blank obtained in the step (3) is treated by adopting steam blowing drying, so that the problem of uniform drying of the blank is solved, and blank cracks are generated due to the fact that the space of 2 holes in the beam is small and the air in the inner hole does not flow and is not synchronous with the drying of the outer surface.
Furthermore, the drying method of the green body comprises the following steps: putting the extruded green body on a drying rack, and respectively inserting a thin tube into each of the two rectangular holes of each cross beam to be communicated with steam; the drying is carried out in a room to solve the problem of asynchronous drying of the inner surface and the outer surface and the problem of blank cracks caused by asynchronous drying. And (3) stopping introducing steam into the low-temperature baking room after 24 hours of introducing the air, drying for 30 hours at the temperature of between 40 and 50 ℃, transferring into the high-temperature baking room, baking for 24 hours at the temperature of between 60 and 70 ℃, and taking out the green body for sintering.
The utility model has the advantages that: the blank body has reasonable structure, high density and uniform wall thickness; the blank is dried uniformly and does not crack; the product has high density and high bending strength; high temp. 1250 deg.C, and no deformation after long-term use.
The present invention will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a cross-sectional view of a reaction sintered silicon carbide ribbed beam according to an embodiment of the present invention;
FIG. 2 is a longitudinal sectional view of an external mold of a special extrusion mold for reaction sintering of a silicon carbide ribbed beam according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along plane A-A of FIG. 2;
FIG. 4 is a schematic structural diagram of a core mold of a special extrusion mold for reaction sintering a silicon carbide ribbed beam according to an embodiment of the present invention;
in the figure:
1-beam, 2-frame structure, 3-reinforced stud, 4-facade, 11-outer mold, 12-core mold, 13-hollow structure, 14-outlet end, 15-horn shape, 16-fixed end, 17-fork, 18-bar space, and 19-extrusion material inlet.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is not intended to limit the invention.
In the embodiment, as shown in fig. 1, a reaction sintered silicon carbide ribbed beam, the cross section of the beam 1 is a frame-shaped structure 2, a reinforcing vertical rib 3 is arranged inside the frame-shaped structure 2, and the load of two vertical surfaces 4 is changed into the load of three vertical surfaces 4; can prevent deformation and improve the structural strength.
The beam is of an extrusion molding structure. The width of the reinforcing vertical rib is 8 mm.
During production, various required raw materials (traditional raw materials: 3-10 micron micro powder and 3-5 micron carbon powder) are mixed together, put into a kneader, added with an adhesive (traditional binder) and water for kneading, then put into an extruder, an extrusion die is arranged at the discharge port of the extruder, and the required square beam blank is extruded out through the extrusion die by the material mud under the action of the screw force of the extruder.
As shown in fig. 2-4, the extrusion die specially used for the reaction sintering silicon carbide ribbed beam comprises a die body, wherein the die body comprises an outer die 11 and a core die 12, a hollow structure 13 is arranged inside the outer die 11, the cross section of the hollow structure 13 at an outlet end 14 is rectangular, and the longitudinal section of the hollow structure 13 at an inlet end 14 is trumpet-shaped 15, so that the addition of an extrusion material is facilitated; one end (inlet end) of the core mold 12 is a fixed end 16 provided with a fixed thread, the other end (outlet end) is provided with two branches 17, the cross sections of the two branches 17 are rectangular, a bar-shaped space 18 between the two branches 17 forms a stud 3 of the beam, and the beam is extruded and molded between the outer mold and the core mold.
The start end of the bifurcation 17 is provided with an extrusion material inlet 19, the extrusion material inlet 19 is of an inclined plane structure, the width of the extrusion material inlet is gradually reduced, the depth of the extrusion material inlet is gradually increased, and the minimum width of the extrusion material inlet is equal to the distance between the two bifurcations 17. The initial end width of the extrusion inlet is 20mm, and the tail end width is 8 mm. The two extrusion material inlets 18 are respectively arranged at the two sides of the core mold, so that the problem of synchronous extrusion and feeding of the peripheral ribs and the middle ribs is solved, blank cracks can be caused if the extrusion and feeding are asynchronous, and the density of the inner ribs and the peripheral density are inconsistent.
The preparation method of the reaction sintered silicon carbide ribbed beam adopts an extrusion molding process and specifically comprises the following steps:
(1) mixing various raw materials (conventional configuration) required by the reaction sintering silicon carbide ribbed beam together for mixing;
(2) putting the mixed materials into a kneader, adding a binder (a traditional binder) and deionized water, and kneading until the materials are kneaded into a mud shape;
(3) putting the kneaded pug into a feeding bin of an extruder (extrusion pressure is 7-9 Kg) for extrusion, and pushing the pug out through a die to form a beam blank under the pushing of the rotating force of a spiral shaft;
(4) roasting the extruded green body, then loading the green body into a high-temperature vacuum sintering furnace at 1750 ℃, performing high-temperature vacuum sintering to the required temperature, stopping the furnace, cooling the green body (at 300 ℃), and discharging the green body from the furnace to obtain the required finished square beam;
(5) the products discharged from the furnace are subjected to rough sand cleaning and bearing capacity test, and then are subjected to sand blasting after being ground.
The key of the synchronous discharging method is the die treatment, namely 8mm ribs, and the tail feeding end is gathered to be 8mm wide from 20mm wide, so that enough material mud can be extruded out through the die under the action of rotating force after reaching the positions of the ribs.
The utility model discloses take extrusion moulding technology: in order to ensure that the periphery and the middle rib discharge are synchronous during extrusion, the rear part of the 8mm space of the middle rib of the die inner core is 20mm wide, the rear part is deep, and the front part is shallow, so that sufficient feeding is achieved, the middle rib and the periphery discharge are synchronous, and the density of a blank is uniform.
And (3) carrying out inner wall treatment on the beam blank obtained in the step (3) by adopting steam blowing drying, solving the problem of uniform drying of the blank, and generating blank cracks out of synchronization with outer surface drying due to no air flow of an inner hole because the space of 2 holes in the middle of the beam is only 3600mm of a rectangular hole of 10x 69.
The drying method of the green body comprises the following steps: and (3) putting the extruded green body on a drying rack, and respectively inserting a thin tube into two rectangular holes of 10x69 of each cross beam to be communicated with steam. The product is placed indoors for natural drying to solve the problem of asynchronous drying of the inner and outer surfaces and the problem of blank cracks caused by asynchronous drying. And (3) stopping introducing steam into the low-temperature baking room after 24 hours of introducing the air, drying for 30 hours at the temperature of between 40 and 50 ℃, transferring into the high-temperature baking room, baking for 24 hours at the temperature of between 60 and 70 ℃, and taking out the green body for sintering.
Utilize the utility model discloses produced crossbeam is as follows through test contrast index:
| index (I) | Unit of | This example | The traditional way of doing it |
| Density of green body | g/cm³ | 2.16 | 2.15 |
| Density of the product | g/cm³ | 3.05 | 0.645 |
| Bending strength | Each with a concentration of force kg | 197 | 275 |
| Silicon carbide content | % | 85.5 | 85 |
Above data contrast can be seen, the utility model discloses the product bending strength that the crossbeam that makes than traditional handicraft has obvious improvement, has solved the difficult problem that the user proposed, practices thrift a large amount of kiln furniture expenses for foamed ceramic manufacture factory.
Through detection, the density of the blank obtained by the utility model can reach more than 2.16g/cm for cultivation. And (3) carrying out high-speed.
Each main bearing beam of the kiln car requires 260 kilograms of bearing concentration force, the beam is 45x85x8x3600mm in specification, and the theoretical bearing of the beam is 197kg according to the national standard.
The raw materials used in the utility model are common raw materials in the production in the field, can be obtained from the market, and can not influence the production result; the utility model discloses in various equipment that adopts, be the conventional equipment who uses in the field of production technology, and the operation of each equipment, parameter etc. all go on according to conventional operation, do not have special part.
Claims (7)
1. The utility model provides a reaction sintering carborundum ribbed beam which characterized in that: the cross section of the cross beam is of a frame-shaped structure, a reinforcing vertical rib is arranged inside the frame-shaped structure, and two vertical face bearing is changed into three vertical face bearing.
2. The reaction-sintered silicon carbide ribbed beam of claim 1 wherein: the beam is of an extrusion molding structure.
3. The reaction-sintered silicon carbide ribbed beam of claim 1 wherein: the width of the reinforcing vertical rib is 8 mm.
4. A special extrusion die for a reaction sintered silicon carbide ribbed beam according to any one of claims 1-3, characterized in that: the special extrusion die comprises a die body, the die body comprises an outer die and a core die, the inner part of the outer die is of a hollow structure, the cross section of the hollow structure at the outlet end is rectangular, and the longitudinal section of the hollow structure at the inlet end is horn-shaped; one end of the core mold is a fixed end, the other end of the core mold is provided with two branches, the cross sections of the two branches are rectangular, and the bar-shaped space between the two branches forms a stud of the beam.
5. The dedicated extrusion die of claim 4, wherein: the top of bifurcation is equipped with the extrusion material entry, the extrusion material entry is the inclined plane structure, and the width reduces gradually, and the degree of depth crescent, minimum width and two the interval between the bifurcation is equal.
6. The dedicated extrusion die of claim 5, wherein: the initial end width of the extrusion inlet is 20mm, and the tail end width is 8 mm.
7. The dedicated extrusion die of claim 5, wherein: and two extrusion material inlets are arranged and are respectively arranged on two sides of the core mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921658836.5U CN210999238U (en) | 2019-09-30 | 2019-09-30 | Reaction sintering silicon carbide ribbed beam and special extrusion die thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921658836.5U CN210999238U (en) | 2019-09-30 | 2019-09-30 | Reaction sintering silicon carbide ribbed beam and special extrusion die thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN210999238U true CN210999238U (en) | 2020-07-14 |
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| CN201921658836.5U Active CN210999238U (en) | 2019-09-30 | 2019-09-30 | Reaction sintering silicon carbide ribbed beam and special extrusion die thereof |
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