CN201122048Y - Large vacuum hotpressing stove - Google Patents
Large vacuum hotpressing stove Download PDFInfo
- Publication number
- CN201122048Y CN201122048Y CNU2007200744801U CN200720074480U CN201122048Y CN 201122048 Y CN201122048 Y CN 201122048Y CN U2007200744801 U CNU2007200744801 U CN U2007200744801U CN 200720074480 U CN200720074480 U CN 200720074480U CN 201122048 Y CN201122048 Y CN 201122048Y
- Authority
- CN
- China
- Prior art keywords
- unit
- furnace
- mrow
- inductor
- graphite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000007731 hot pressing Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 76
- 239000010439 graphite Substances 0.000 claims abstract description 70
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 70
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 61
- 230000006698 induction Effects 0.000 claims abstract description 35
- 230000003028 elevating effect Effects 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 101100356682 Caenorhabditis elegans rho-1 gene Proteins 0.000 claims description 6
- 230000033001 locomotion Effects 0.000 claims description 6
- 230000035515 penetration Effects 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 239000011449 brick Substances 0.000 claims description 3
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 239000002966 varnish Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 108010076282 Factor IX Proteins 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 28
- 230000008569 process Effects 0.000 abstract description 27
- 238000007789 sealing Methods 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 abstract description 4
- 230000000630 rising effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 10
- 238000005245 sintering Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000008207 working material Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Landscapes
- Furnace Details (AREA)
Abstract
The utility model relates to a large-scale vacuum hot-pressing furnace which comprises an electric furnace body. The electric furnace body is composed of a furnace mantle, an elevating device on the bottom of the furnace mantle and an induction heating device in the furnace mantle. The elevating device on the bottom of the furnace mantle is composed of a loading lift platform, an electric motor, three plane guide posts supported on the bottom of the loading lift platform and two adjusting screw mandrels driven by an electric motor synchronously. The induction heating device consists of an inductor and a furnace lining. A fire-resisting heat-insulating layer and an electrical insulating layer are respectively arranged around the furnace lining structure positioned between the induction coil of the inductor and the graphite heating tube. The vacuum hot-pressing furnace can be utilized to make the process of feeding and discharging more precise, secured and reliable, meet the requirements of a vacuum sealing performance and improve the planarity of the loading lift platform. The adoption of an induction heating way can improve the rate of temperature rising significantly. In addition, as the heating body is a graphite sensing tube, a comparatively high strength is still available at a high temperature. Heating elements fail to be damaged even if a graphite mould cracks in the stressed condition.
Description
Technical Field
The utility model relates to a sintering of ceramic material, relates to the equipment that ceramic material heated, sintered in vacuum or protective atmosphere, specifically speaking relates to a large-scale vacuum autoclave.
Background
A medium frequency induction vacuum hot pressing furnace belongs to an electric furnace for periodic operation. The original bottom charging mechanism generally adopts a cylinder or hydraulic cylinder jacking mechanism to complete the charging process of the vertical vacuum furnace from the bottom of the furnace body. Because the cylinder or the hydraulic cylinder has poor stability in the reciprocating motion process and strong impact, the precision of the lifting platform, the flatness of the working material table and the vacuum sealing performance of the working material table and the furnace body are difficult to control. In the prior art, a screw rod lifting device is adopted, but in the lifting device, because only two plane guide columns are adopted for guiding, the flatness of the feeding lifting platform is still difficult to ensure.
In addition, a vacuum resistance heating mode is adopted in a common vacuum hot-pressing furnace in the prior art, a graphite tube is used for heating, and the heating rate is slow in the heating process; in the hot pressing process, the graphite mold is easy to crack under the pressure condition, so that the graphite tube for heating is damaged.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough that prior art exists, providing a large-scale vacuum autoclave, utilizing the utility model discloses can make the accurate safe and reliable more of business turn over material process, satisfy vacuum sealing performance's requirement, show the plane degree that improves material loading lift platform. The induction heating mode is adopted, so that the temperature rising speed is obviously improved. Because the heating element is a graphite sensing cylinder, the heating element still has higher strength at high temperature, and the heating element cannot be damaged even if the graphite die is broken under the compression condition.
The purpose of the utility model is realized like this:
the large vacuum hot pressing furnace comprises an electric furnace main body, wherein the electric furnace main body comprises a furnace shell, a lifting device at the bottom of the furnace shell and an induction heating device in the furnace shell; the furnace shell bottom lifting device comprises a feeding lifting platform, a motor, a plane guide post and an adjusting screw rod, wherein the plane guide post is supported at the bottom of the feeding lifting platform; it is characterized in that the preparation method is characterized in that,
the number of the plane guide posts is three; the two adjusting screw rods are synchronously driven by one motor;
the induction heating device comprises an inductor and a furnace lining;
the inductor comprises an induction coil and a graphite sensing cylinder which are formed by winding a red copper pipe; and a refractory heat-insulating layer and an electric insulating layer are respectively arranged around the furnace lining structure between the induction coil and the graphite sensing cylinder.
In the large vacuum autoclave, wherein,
the fireproof heat insulation layer is arranged between the graphite sensing cylinder and the induction coil and is formed by combining a graphite felt product and a graphite brick product.
The electric insulation layer is arranged on the periphery of the induction coil and is made by wrapping a mica tape after high-strength insulating varnish is sprayed and dried.
And two sets of travel switches are respectively arranged at the extreme positions of the upper movement and the lower movement of the feeding lifting platform.
The overall flatness of the feeding lifting platform is less than or equal to 0.2mm in the running process.
The power of the electric furnace main body and the number of turns of the inductor are calculated by the following formula:
wherein,
power of electric furnace
<math>
<mrow>
<mi>P</mi>
<mo>=</mo>
<mn>0.6</mn>
<mo>·</mo>
<msup>
<mi>F</mi>
<mn>0.76</mn>
</msup>
<msup>
<mrow>
<mo>(</mo>
<mi>T</mi>
<mo>/</mo>
<mn>1000</mn>
<mo>)</mo>
</mrow>
<mn>2.53</mn>
</msup>
</mrow>
</math>
Unit kW
Wherein F is the surface area unit dm of the effective heating zone2
T is heating temperature unit K (Kelvin)
The number of turns of the inductor is calculated as:
1) diameter d unit cm of graphite heating element
2) Height h unit cm of graphite heating element
3) Diameter D unit cm of inductor
4) Height H unit cm of inductor
5) Depth of penetration of the inductor
<math>
<mrow>
<mi>δ</mi>
<mn>1</mn>
<mo>=</mo>
<mn>5033</mn>
<mo>·</mo>
<msqrt>
<mi>ρ</mi>
<mn>1</mn>
<mo>/</mo>
<mi>f</mi>
</msqrt>
</mrow>
</math>
Unit cm
Where ρ 1 is the specific resistance unit Ω · cm of copper
f is the frequency unit Hz of the medium-frequency power supply
6) Penetration depth of graphite heating element
<math>
<mrow>
<mi>δ</mi>
<mn>2</mn>
<mo>=</mo>
<mn>5033</mn>
<mo>·</mo>
<msqrt>
<mi>ρ</mi>
<mn>2</mn>
<mo>/</mo>
<mi>f</mi>
</msqrt>
</mrow>
</math>
Unit cm
In the formula, ρ 2 is the specific resistance unit Ω · cm of graphite
f is the frequency unit Hz of the medium-frequency power supply
7) Calculated diameter d' ═ d-delta 2 unit cm of graphite heating element
8) The single-turn resistance R01 of the inductor is rho 1 (pi.D/K3. delta.1. H) unit omega
K3 is the fill factor
9) Graphite heating element single-turn resistance R02 ═ rho 2 · (pi · d'/delta 2 · h) unit omega
10) Self-inductance of inductor
<math>
<mrow>
<mi>L</mi>
<mn>01</mn>
<mo>=</mo>
<mfrac>
<mrow>
<msup>
<mi>π</mi>
<mn>2</mn>
</msup>
<msup>
<mi>D</mi>
<mn>2</mn>
</msup>
</mrow>
<mi>H</mi>
</mfrac>
<mo>·</mo>
<mi>α</mi>
<mn>1</mn>
</mrow>
</math>
Unit cm
Wherein α 1 is the length coefficient of the inductor
11) Self-induction coefficient of graphite heating element
<math>
<mrow>
<mi>L</mi>
<mn>02</mn>
<mo>=</mo>
<mfrac>
<mrow>
<msup>
<mi>π</mi>
<mn>2</mn>
</msup>
<msup>
<mi>d</mi>
<mn>2</mn>
</msup>
</mrow>
<mi>h</mi>
</mfrac>
<mo>·</mo>
<mi>α</mi>
<mn>2</mn>
</mrow>
</math>
Unit cm
Wherein α 2 is a length coefficient of the graphite heating element
12) Mutual inductance coefficient of inductor-graphite heating element system
Wherein F is the geometric size coefficient of the inductor
13) Angular frequency ω 2 π f
14) Reactance X of inductor01＝ω·L01×10-9Unit omega
15) Reactance X of graphite heating body02＝ω·L02×10-9Unit omega
16) Inductor-graphite heating element system mutual inductance reactor
X02＝ω·M12×10-9Unit omega
17) Transformation coefficient of inductor-graphite heating body system
18) Reduced resistance R of furnace0＝R01+A2R02Unit omega
19) Reduced reactance X of furnace0＝X01-A2X02Unit omega
20) Reduced impedance of furnace Unit omega
21) Input voltage U0 unit V of the furnace
22) Ampere turn number
<math>
<mrow>
<mi>I</mi>
<mn>0</mn>
<mo>=</mo>
<msqrt>
<mi>P</mi>
<mo>×</mo>
<msup>
<mn>10</mn>
<mn>3</mn>
</msup>
<mo>/</mo>
<mi>R</mi>
<mn>0</mn>
</msqrt>
</mrow>
</math>
Unit A
23) Interturn voltage U1-Z0. I0 unit V
24) The number of turns n of the inductor is U0/U1
Since the technical scheme is used, compared with the prior art, the utility model, have following advantage and positive effect:
1. the furnace shell bottom lifting device of the utility model adopts three plane guide posts to carry out the operation control of bottom charging; the two screw rods are driven by one motor, so that the synchronism of the two screw rods is ensured. The screw rod transmission runs stably and reliably in the lifting process, the positioning is convenient and accurate, and the lifting height of the feeding platform can be adjusted at will to adapt to the lifting process of charging trays with different heights.
2. The screw rod transmission is driven by motors with different reduction ratios, so that the speed can be flexibly adjusted, and the requirements of different bottom loading lifting speeds required by users can be met very conveniently. The motor adopts variable frequency speed regulation in the operation process, and corresponding lifting speeds are adopted in different charging stages, so that the charging and discharging process is more accurate, safe and reliable, and the requirement on the vacuum sealing performance can be met.
3. The electric furnace of the utility model adopts a medium-frequency induction heating mode, the heating body is a graphite sensing cylinder, and the heating rate is faster. The heating element is a thick-walled graphite susceptor cylinder with the thickness of 50mm, the strength is high at high temperature, and the heating element can not be damaged even if the graphite mold is broken under the pressure condition.
4. The utility model discloses the application induction heater lets in the water-cooling, under high-power intermediate frequency power's work, takes place electromagnetic induction and produces the heat to rapid heating up in several minutes. When the medium-frequency power supply is powered off, the cooling water takes away heat in the workpiece and the hearth, and the purpose of rapid cooling is achieved. Therefore, the process problems of sintering special refractory metals and sintering high-temperature ceramic materials applied to the advanced technical fields of aerospace, nuclear industry and national defense under high pressure are solved, and the rate control requirements of temperature rise and temperature drop which need to be met in the induction heating process are structurally met. The accurate, stable and reliable bottom charging mechanism is particularly designed by adopting double-screw transmission, so that the labor intensity of workers is greatly reduced. The driven furnace cover can well play a role in sealing, and meanwhile, the furnace cover is not deformed due to delicate water cooling circulation, so that the service life is longer.
Drawings
The objects, specific structural features and advantages of the present invention will be further understood from the following description of the embodiments taken in conjunction with the accompanying drawings. Wherein, the attached drawings are as follows:
FIG. 1 is a schematic view of the overall assembly structure of a large hot-pressing heating furnace of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic view of the bottom elevating device of the furnace casing in FIG. 1;
FIG. 4 is a left side view of the structure of FIG. 3;
FIG. 5 is a schematic top view of the structure of FIG. 3;
FIG. 6 is a schematic structural view of the induction heating apparatus of FIG. 1;
FIG. 7 is a schematic top view of the structure of FIG. 6;
fig. 8 is an enlarged schematic view of the portion I in fig. 6.
Detailed Description
The vacuum hot-pressing furnace of the present invention as shown in fig. 1 and 2 is a periodic electric furnace that heats in a vacuum (or protective atmosphere) state by using a medium frequency induction method. The electric furnace comprises an upper mounting seat 1 and a lower mounting seat 9 which are supported by four upright posts 19, an electric furnace main body is fixedly connected with the four upright posts 19 through connecting pieces respectively, and the electric furnace main body mainly comprises a furnace cover 3, a furnace lining 4, a furnace shell 5, a lifting device 8 at the bottom of the furnace shell and an induction heating device in the furnace shell 5. The hot-pressing die filled with the powder adopts a bottom charging mode, and is loaded into the hearth through the bottom charging platform 7, so that the hot-pressing die is positioned in the middle of the graphite heating body. The furnace shell 5, the vacuum system 10 and the gas charging system can keep the hearth in a vacuum or protective atmosphere state all the time.
As shown in fig. 3, 4 and 5, the lifting device 8 at the bottom of the furnace shell of the present invention comprises a loading lifting platform 7, a motor 85, a plane guide post 89 supported at the bottom of the loading lifting platform 7 and an adjusting screw 84. The guide post 89 is fixed through the mounting seat 81, and depends on the guide sleeve 82 to guide, the support table 83 is connected with the guide sleeve 82 and the screw rod 84, when the screw rod 84 runs, the guide sleeve 83 is driven to run up and down according to the guide path of the guide sleeve 82, and the support table 83 drives the feeding platform 7 to complete the whole feeding and discharging process.
In this embodiment, the two screws 84 are used for synchronous transmission to drive the feeding platform 7 to ascend and enter the heating furnace. In the lifting movement process of bottom loading, in order to ensure the stable lifting of the loading platform 7 and maintain the lifting accuracy within the effective lifting height range and the levelness of the plane of the loading platform 7, three plane guide posts 89 are adopted to perform the bottom loading operation according to the principle that three points determine one plane. The two lead screws 84 are driven by a motor 85 to ensure the transmission synchronism of the two lead screws 84. The screw 84 runs stably and reliably in the lifting process, is convenient and accurate to position, can adjust the lifting height of the feeding platform 7 at will, and is suitable for lifting processes of trays with different heights. The three plane guide posts 89 are adopted to ensure that the feeding platform 7 is always in the same horizontal plane in the lifting process.
The actual measurement results are that: during the operation of the feeding lifting platform 7, the flatness of the feeding lifting platform can be controlled within 0.2mm, and the feeding lifting platform does not deform under the high-temperature condition. The motors 85 with different reduction ratios are used for driving the two screw rods 84 to adjust the speed, so that the requirement of the bottom loading material lifting speed required by a user can be conveniently met. The motor 85 adopts variable frequency speed regulation in the operation process, and adopts corresponding lifting speed in different charging stages, so that the charging and discharging process is more accurate, safe and reliable. The medium frequency power supply outside the furnace body and the cooling water of the coil are led into the induction coil 62 in the hearth through the feeder device 11, so that the vacuum sealing performance of the electric furnace body is ensured.
In order to ensure the safety and reliability of the operation process, the utility model discloses respectively adopt upper and lower two sets of travel switches 87, 88 to control at the extreme position of the up-and-down motion of material loading lift platform 7. When the feeding platform 7 touches any one of the upper or lower sets of travel switches 87 and 88 in the ascending or descending process, a signal is sent out, the transmission motor stops running, and the feeding platform 7 ascends or descends to the right position. Therefore, damage to the motor 85 or the two screw rods 84 caused by the fact that a single travel switch fails in the using process and a signal cannot be sent to the control system to stop the operation of the transmission motor 85 in time when the feeding platform 7 ascends or descends to the proper position can be avoided.
As shown in fig. 6, 7 and 8, the induction heating device located in the furnace chamber includes an inductor 6 and a furnace lining 4, and the inductor 6 includes an induction coil 62 formed by winding a copper tube and a graphite susceptor 61. In operation, the induction heating device may be considered as an air core transformer, and the winding of the inductor 6 comprises a primary winding and a secondary winding, wherein the primary winding is an induction coil 62 wound from copper tubing, and the secondary winding is a graphite susceptor 61. Intermediate frequency current is passed through the primary copper tube winding to establish an alternating magnetic flux which also creates a sufficiently high induced potential in the secondary winding graphite susceptor 61 to generate eddy currents on the outside of the graphite susceptor 61 parallel to the inductor 6. The induction current generated on the side surface of the graphite susceptor cylinder 61 is reduced sharply from the edge, the induction current reaches a high value on the surface layer of the graphite susceptor cylinder 61 which is relatively thin, and the purpose of heating the workpiece is achieved by means of high heat emitted by the induction current.
The furnace lining 4 structure between the induction coil 62 and the graphite susceptor cylinder 61 of the inductor 6 is mainly composed of two parts, a refractory heat-insulating layer 63 and an electrical insulating layer 64. The refractory insulating layer 63 is provided between the graphite susceptor 61 and the induction coil 62, and is formed by combining a graphite felt product and a graphite brick product. The electrical insulation layer 64 is arranged at the periphery of the induction coil 62 and is made by wrapping a mica tape after being sprayed and dried by using high-strength insulation varnish. The refractory heat insulating layer 63 concentrates the high temperature generated by the heating body in the furnace chamber, so that the heat loss is reduced as much as possible, and the electric insulating layer 64 ensures the electric insulation of the inductor 6.
The power of the electric furnace main body and the number of turns of the inductor 6 are calculated by the following formula.
Calculating the power of the electric furnace main body:
power of electric furnace
<math>
<mrow>
<mi>P</mi>
<mo>=</mo>
<mn>0.6</mn>
<mo>·</mo>
<msup>
<mi>F</mi>
<mn>0.76</mn>
</msup>
<msup>
<mrow>
<mo>(</mo>
<mi>T</mi>
<mo>/</mo>
<mn>1000</mn>
<mo>)</mo>
</mrow>
<mn>2.53</mn>
</msup>
</mrow>
</math>
Unit kW
Wherein F is the surface area unit dm of the effective heating zone2
T is heating temperature unit K (Kelvin)
The number of turns of the inductor is calculated as:
1) diameter d unit cm of graphite heating element
2) Height h unit cm of graphite heating element
3) Diameter D unit cm of inductor
4) Height H unit cm of inductor
5) Depth of penetration of the inductor
<math>
<mrow>
<mi>δ</mi>
<mn>1</mn>
<mo>=</mo>
<mn>5033</mn>
<mo>·</mo>
<msqrt>
<mi>ρ</mi>
<mn>1</mn>
<mo>/</mo>
<mi>f</mi>
</msqrt>
</mrow>
</math>
Unit cm
Where ρ 1 is the specific resistance unit Ω · cm of copper
f is the frequency unit Hz of the medium-frequency power supply
6) Penetration depth unit cm of graphite heating element
In the formula, ρ 2 is the specific resistance unit Ω · cm of graphite
f is the frequency unit Hz of the medium-frequency power supply
7) Calculated diameter d' ═ d-delta 2 unit cm of graphite heating element
8) The single-turn resistance R01 of the inductor is rho 1 (pi.D/K3. delta.1. H) unit omega
K3 is the fill factor
9) Graphite heating element single-turn resistance R02 ═ rho 2 · (pi · d'/delta 2 · h) unit omega
10) Self-inductance of inductor
<math>
<mrow>
<mi>L</mi>
<mn>01</mn>
<mo>=</mo>
<mfrac>
<mrow>
<msup>
<mi>π</mi>
<mn>2</mn>
</msup>
<msup>
<mi>D</mi>
<mn>2</mn>
</msup>
</mrow>
<mi>H</mi>
</mfrac>
<mo>·</mo>
<mi>α</mi>
<mn>1</mn>
</mrow>
</math>
Unit cm
Wherein α 1 is the length coefficient of the inductor
11) Self-induction coefficient of graphite heating element
<math>
<mrow>
<mi>L</mi>
<mn>02</mn>
<mo>=</mo>
<mfrac>
<mrow>
<msup>
<mi>π</mi>
<mn>2</mn>
</msup>
<msup>
<mi>d</mi>
<mn>2</mn>
</msup>
</mrow>
<mi>h</mi>
</mfrac>
<mo>·</mo>
<mi>α</mi>
<mn>2</mn>
</mrow>
</math>
Unit cm
Wherein α 2 is a length coefficient of the graphite heating element
12) Mutual inductance coefficient of inductor-graphite heating element system
Wherein F is the geometric size coefficient of the inductor
13) Angular frequency ω 2 π f
14) Reactance X of inductor01＝ω·L01×10-9Unit omega
15) Reactance X of graphite heating body02＝ω·L02×10-9Unit omega
16) Inductor-graphite heating element system mutual inductance reactor
X02＝ω·M12×10-9Unit omega
17) Transformation coefficient of inductor-graphite heating body system
18) Reduced resistance R of furnace0＝R01+A2R02Unit omega
19) Reduced reactance X of furnace0＝X01-A2X02 Unit omega
20) Reduced impedance of furnace Unit omega
21) Input voltage U0 unit V of the furnace
22) Ampere turn number
<math>
<mrow>
<mi>I</mi>
<mn>0</mn>
<mo>=</mo>
<msqrt>
<mi>P</mi>
<mo>×</mo>
<msup>
<mn>10</mn>
<mn>3</mn>
</msup>
<mo>/</mo>
<mi>R</mi>
<mn>0</mn>
</msqrt>
</mrow>
</math>
Unit A
23) Interturn voltage UI Z0. I0 unit V
24) The number of turns n of the inductor is U0/U1
The production process of the large-scale vacuum hot-pressing furnace of the utility model is roughly as follows:
the utility model discloses intermediate frequency power supply adopts silicon controlled rectifier frequency conversion device. In the heating process, when the temperature in the furnace is lower than 1000 ℃, a thermocouple temperature measuring device 2 is adopted to measure the temperature in the furnace; when the temperature in the furnace is higher than 1000 ℃, the thermocouple temperature measuring device 2 exits from the heating zone, and the thermal infrared temperature measuring device 13 is adopted to measure the temperature in the hearth.
When the temperature in the hearth reaches the hot-pressing working temperature, the upper jack 12 and the lower jack 18 act to press the powder in the die to the height required by the process, and then the powder is subjected to heat preservation and sintering. And preserving heat in the sintering process according to the process requirement. After sintering, Ar gas can be introduced into the furnace shell for cooling. When the temperature is cooled to room temperature, the materials can be discharged to complete the whole hot-pressing sintering process.
The lifting device 8 at the bottom of the furnace shell adopts a speed reducer to simultaneously drive two synchronous screw rods 84 to complete the lifting action of the feeding lifting platform 7, and after the feeding lifting platform 7 is lifted in place, the manual fixing bolt is adopted for locking, so that the feeding lifting platform 7 and the furnace shell 5 of the electric furnace main body are always kept in good sealing performance in the operation process. An upper pressure head 14 and a lower pressure head 17 with phi 320 are respectively arranged on the furnace cover 3 and the feeding platform 7, and the diameters of the upper pressure head 14 and the lower pressure head 17 can be properly adjusted according to the needs of users. The upper and lower pressure heads 14, 17 are driven by upper and lower hydraulic jacks 12, 18 fixed on the upper and lower mounting seats 1, 9 of the electric furnace main body bracket respectively, and the hot-pressing sintering process is completed. The inner pressure head 16 of the hearth is made of graphite and is fixed on the upper pressure head 14 through a graphite nut 15. The effective strokes of the upper and lower pressing heads 14, 17 can be properly adjusted according to the needs of users, and in this embodiment, the effective strokes of the upper and lower pressing heads 14, 17 are 200 mm.
Claims (6)
1. The large vacuum hot pressing furnace comprises an electric furnace main body, wherein the electric furnace main body comprises a furnace shell, a lifting device at the bottom of the furnace shell and an induction heating device in the furnace shell; the furnace shell bottom lifting device comprises a feeding lifting platform, a motor, a plane guide post and an adjusting screw rod, wherein the plane guide post is supported at the bottom of the feeding lifting platform; it is characterized in that the preparation method is characterized in that,
the number of the plane guide posts is three; the two adjusting screw rods are synchronously driven by one motor;
the induction heating device comprises an inductor and a furnace lining;
the inductor comprises an induction coil and a graphite sensing cylinder which are formed by winding a red copper pipe; and a refractory heat-insulating layer and an electric insulating layer are respectively arranged around the furnace lining structure between the induction coil and the graphite sensing cylinder.
2. The large scale vacuum autoclave furnace of claim 1, wherein the refractory heat insulating layer is disposed between the graphite susceptor and the induction coil and is formed by combining graphite felt and graphite brick.
3. The large-scale vacuum autoclave furnace according to claim 1 or 2, characterized in that the electric insulation layer is arranged at the periphery of the induction coil and is made by spraying and drying high-strength insulating varnish and then wrapping mica tape.
4. The large-scale vacuum hot-pressing furnace according to claim 1, wherein two sets of travel switches are respectively arranged at the limit positions of the up-and-down movement of the feeding lifting platform.
5. The large-scale vacuum autoclave furnace according to claim 1, characterized in that the overall flatness of the loading elevating platform is less than or equal to 0.2mm during the operation.
6. The large vacuum hot pressing furnace according to claim 1, wherein the power of the electric furnace main body and the number of turns of the inductor are calculated by the following formulas:
wherein,
electric furnace power P is 0.6F0.76(T/1000)2.35Unit kW
Wherein F is the surface area unit dm of the effective heating zone2
T is heating temperature unit K (Kelvin)
The number of turns of the inductor is calculated as:
1) diameter d unit cm of graphite heating element
2) Height h unit cm of graphite heating element
3) Diameter D unit cm of inductor
4) Height H unit cm of inductor
5) Depth of penetration of the inductor
<math>
<mrow>
<mi>δ</mi>
<mn>1</mn>
<mo>=</mo>
<mn>5033</mn>
<mo>·</mo>
<msqrt>
<mi>ρ</mi>
<mn>1</mn>
<mo>/</mo>
<mi>f</mi>
</msqrt>
</mrow>
</math>
Unit cm
Where ρ 1 is the specific resistance unit Ω · cm of copper
f is the frequency unit Hz of the medium-frequency power supply
6) Penetration depth of graphite heating element
<math>
<mrow>
<mi>δ</mi>
<mn>2</mn>
<mo>=</mo>
<mn>5033</mn>
<mo>·</mo>
<msqrt>
<mi>ρ</mi>
<mn>2</mn>
<mo>/</mo>
<mi>f</mi>
</msqrt>
</mrow>
</math>
Unit cm
In the formula, ρ 2 is the specific resistance unit Ω · cm of graphite
f is the frequency unit Hz of the medium-frequency power supply
7) Calculated diameter d' ═ d-delta 2 unit cm of graphite heating element
8) The single-turn resistance R01 of the inductor is rho 1 (pi.D/K3. delta.1. H) unit omega
K3 is the fill factor
9) Graphite heating element single-turn resistance R02 ═ rho 2 · (pi · d'/delta 2 · h) unit omega
10) Self-inductance of inductor
<math>
<mrow>
<mi>L</mi>
<mn>01</mn>
<mo>=</mo>
<mfrac>
<mrow>
<msup>
<mi>π</mi>
<mn>2</mn>
</msup>
<msup>
<mi>D</mi>
<mn>2</mn>
</msup>
</mrow>
<mi>H</mi>
</mfrac>
<mo>·</mo>
<mi>α</mi>
<mn>1</mn>
</mrow>
</math>
Unit cm
Wherein α 1 is the length coefficient of the inductor
11) Self-induction coefficient of graphite heating element
<math>
<mrow>
<mi>L</mi>
<mn>02</mn>
<mo>=</mo>
<mfrac>
<mrow>
<msup>
<mi>π</mi>
<mn>2</mn>
</msup>
<msup>
<mi>d</mi>
<mn>2</mn>
</msup>
</mrow>
<mi>h</mi>
</mfrac>
<mo>·</mo>
<mi>α</mi>
<mn>2</mn>
</mrow>
</math>
Unit cm
Wherein α 2 is a length coefficient of the graphite heating element
12) Mutual inductance coefficient of inductor-graphite heating element system
Wherein F is the geometric size coefficient of the inductor
13) Angular frequency ω 2 π f
14) Reactance X of inductor01＝ω·L01×10-9Unit omega
15) Reactance X of graphite heating body02＝ω·L02×10-9Unit omega
16) Inductor-graphite heating element system mutual inductance reactor
X02＝ω·M12×10-9Unit omega
17) Transformation coefficient of inductor-graphite heating body system
18) Reduced resistance R of furnace0＝R01+A2R02Unit omega
19) Reduced reactance X of furnace0＝X01-A2X02Unit omega
20) Reduced impedance of furnace Unit omega
21) Input voltage U0 unit V of the furnace
22) Ampere turn number
<math>
<mrow>
<mi>I</mi>
<mn>0</mn>
<mo>=</mo>
<msqrt>
<mi>P</mi>
<mo>×</mo>
<msup>
<mn>10</mn>
<mn>3</mn>
</msup>
<mo>/</mo>
<mi>R</mi>
<mn>0</mn>
</msqrt>
</mrow>
</math>
Unit A
23) Interturn voltage U1-Z0. I0 unit V
24) The number of inductor turns n is U0/U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200744801U CN201122048Y (en) | 2007-09-07 | 2007-09-07 | Large vacuum hotpressing stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200744801U CN201122048Y (en) | 2007-09-07 | 2007-09-07 | Large vacuum hotpressing stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201122048Y true CN201122048Y (en) | 2008-09-24 |
Family
ID=40009278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200744801U Expired - Lifetime CN201122048Y (en) | 2007-09-07 | 2007-09-07 | Large vacuum hotpressing stove |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201122048Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554106A (en) * | 2011-11-16 | 2012-07-11 | 四川畅丰车桥有限公司 | Automatic feeding medium-frequency diathermic furnace for forging automobile half axle |
| CN102031386B (en) * | 2009-09-29 | 2013-09-11 | 上海重型机器厂有限公司 | Lifting platform and transmission device |
| CN103586573A (en) * | 2013-11-15 | 2014-02-19 | 中国科学院福建物质结构研究所 | Large vacuum hot-pressing furnace |
| CN104697331A (en) * | 2013-12-04 | 2015-06-10 | 中国科学院上海高等研究院 | Semiconductor material preparation equipment |
| CN104942264A (en) * | 2015-06-19 | 2015-09-30 | 法格霭德兰汽车配件（昆山）有限公司 | Efficient smelting furnace |
| CN113915991A (en) * | 2018-04-24 | 2022-01-11 | 达涅利自动化有限公司 | Electric power method for electric furnace |
-
2007
- 2007-09-07 CN CNU2007200744801U patent/CN201122048Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031386B (en) * | 2009-09-29 | 2013-09-11 | 上海重型机器厂有限公司 | Lifting platform and transmission device |
| CN102554106A (en) * | 2011-11-16 | 2012-07-11 | 四川畅丰车桥有限公司 | Automatic feeding medium-frequency diathermic furnace for forging automobile half axle |
| CN103586573A (en) * | 2013-11-15 | 2014-02-19 | 中国科学院福建物质结构研究所 | Large vacuum hot-pressing furnace |
| CN104697331A (en) * | 2013-12-04 | 2015-06-10 | 中国科学院上海高等研究院 | Semiconductor material preparation equipment |
| CN104697331B (en) * | 2013-12-04 | 2019-04-23 | 中国科学院上海高等研究院 | Semiconductor material Preparation equipment |
| CN104942264A (en) * | 2015-06-19 | 2015-09-30 | 法格霭德兰汽车配件（昆山）有限公司 | Efficient smelting furnace |
| CN104942264B (en) * | 2015-06-19 | 2017-03-01 | 法格霭德兰汽车配件（昆山）有限公司 | A kind of efficient smelting furnace |
| CN113915991A (en) * | 2018-04-24 | 2022-01-11 | 达涅利自动化有限公司 | Electric power method for electric furnace |
| CN113915991B (en) * | 2018-04-24 | 2023-12-26 | 达涅利自动化有限公司 | Electric power method of electric furnace |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100592835C (en) | Large-sized vacuum hotpressing stove | |
| CN201122048Y (en) | Large vacuum hotpressing stove | |
| CN109971928B (en) | Slab induction heating device | |
| CN104475587B (en) | A kind of conductive heater manufacturing process | |
| CN102886597B (en) | High-frequency alloy machine for silicon laminates | |
| CN105499476B (en) | One kind is forged with vacuum heat-preserving induction heater | |
| CN105682270B (en) | A kind of high-frequency electromagnetic induction hot pressed sintering and brazing device | |
| CN107866443A (en) | Strip on-line heating device during a kind of magnesium alloy rolling | |
| CN102883490A (en) | Glass die heating device | |
| CN101377383B (en) | Rapid vacuum induction melting furnace | |
| CN203235930U (en) | Induction heating device for riser of steel ingot | |
| CN208471885U (en) | Lift induction heating apparatus and glass bending molding machine | |
| US3350494A (en) | Induction furnace | |
| CN209923383U (en) | Slab induction heating device | |
| CN209226875U (en) | A kind of pressing mold preheating device | |
| CN218480908U (en) | Vacuum induction hot-pressing sintering furnace | |
| CN2633491Y (en) | Electromagentic induction heater for roll patch weld | |
| CN206146189U (en) | Die heating furnace | |
| CN216264430U (en) | Press-fitting cooling mechanism for stator in shell | |
| CN115060073A (en) | Super-huge type ceramic component high-temperature atmosphere sintering furnace and sintering method thereof | |
| CN111430146B (en) | Induction coil assembly for induction heating and machining device and method thereof | |
| CN210966977U (en) | Square tungsten molybdenum induction sintering furnace | |
| CN105646001A (en) | Ceramic wafer high pressure heat treatment device | |
| CN112588974A (en) | Aluminum alloy heating equipment and operation method | |
| CN220498179U (en) | Welded workpiece heat preservation structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20070907 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |