CN110657673A - Square heating element device of tungsten-molybdenum sintering furnace - Google Patents
Square heating element device of tungsten-molybdenum sintering furnace Download PDFInfo
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- CN110657673A CN110657673A CN201910995936.5A CN201910995936A CN110657673A CN 110657673 A CN110657673 A CN 110657673A CN 201910995936 A CN201910995936 A CN 201910995936A CN 110657673 A CN110657673 A CN 110657673A
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- tungsten
- heating element
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- square
- strip
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 66
- MGRWKWACZDFZJT-UHFFFAOYSA-N molybdenum tungsten Chemical compound [Mo].[W] MGRWKWACZDFZJT-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000005245 sintering Methods 0.000 title claims abstract description 19
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 133
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 127
- 239000010937 tungsten Substances 0.000 claims abstract description 127
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 22
- 239000000463 material Substances 0.000 abstract description 14
- 238000011084 recovery Methods 0.000 abstract description 7
- 230000006698 induction Effects 0.000 description 13
- 238000005265 energy consumption Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 239000011733 molybdenum Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
- F27B14/061—Induction furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/14—Arrangements of heating devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a square heating element device of a tungsten-molybdenum sintering furnace, which comprises a short tungsten bar, a spigot and a long tungsten bar; short tungsten strip and long tungsten strip pass through the tang and be connected, short tungsten strip and long tungsten strip concatenation constitute the square tungsten strip of one deck, four angles of square tungsten strip are the heat-generating body turning, every layer of tungsten strip successive layer stack that splices constitutes the heat-generating body, the seam of long tungsten strip and short tungsten strip staggers each other during the stack. In the invention, each tungsten bar is in a free state and does not need to be welded. After the service life of the heating element is reached, the tungsten bar can be disassembled, and the tungsten bar with small deformation can be recovered and used for manufacturing a new heating element, in the actual production, the recovery rate of the scrapped heating element material can reach more than 70 percent, a large amount of valuable tungsten materials can be saved, the production consumption is greatly reduced, and the production cost is saved.
Description
Technical Field
The invention belongs to the field of tungsten and molybdenum processing equipment, and particularly relates to a square heating element device of a tungsten and molybdenum sintering furnace.
Background
The medium frequency induction sintering furnace is an important device widely used in the special metal processing industry of tungsten, molybdenum and the like. Induction heating is one of the good forms of electric heating, and it utilizes the faraday's electromagnetic induction principle to convert electric energy into heat energy, so that a three-phase power supply is changed into intermediate frequency alternating current by means of an intermediate frequency induction power supply, and after the alternating current passes through an induction coil, an alternating induction magnetic field is produced, i.e. an alternating magnetic flux phi whose size and direction are changed with time is produced. When a piece of conductive metal (namely tungsten and molybdenum workpieces) is placed in the induction coil, corresponding induced electromotive force can be generated inside the metal according to a Faraday's law of electromagnetic induction, the induced current can be generated due to the existence of the induced electromotive force even if the metal is a conductor, the induced current is called eddy current, and according to the Joule-Lenz law, the eddy current can generate certain heat when flowing inside the metal with certain resistance, so that the metal is heated.
At present, the hearth of a tungsten-molybdenum sintering furnace which is conventionally used is round, and when a plate blank is sintered, the space utilization rate is low, the energy consumption is high, the efficiency is low, and the requirement for large-scale sintering of the plate blank cannot be met. In addition, in the sintering process, due to insufficient charging, the slab is easy to deform in the sintering process, so that the subsequent processing and manufacturing are inconvenient, in order to save cost, the deformed slab needs to be heated and corrected, the production cost is increased, and the quality of the product is influenced by heating and pressure processing in the correction process.
Disclosure of Invention
In order to solve the problems of high energy consumption, low capacity and high cost in the prior art, the invention provides the square heating element device of the tungsten-molybdenum sintering furnace. The square heating body can increase the utilization rate of the hearth, the energy consumption is low, and the capacity is high. The recovery rate of the scrapped square heating element can reach more than 70 percent, a large amount of valuable tungsten materials can be saved, the production consumption is greatly reduced, and the production cost is saved.
The technical scheme adopted by the invention is as follows:
a square heating element device of a tungsten-molybdenum sintering furnace comprises a short tungsten bar, a spigot and a long tungsten bar; short tungsten strip and long tungsten strip pass through the tang and be connected, short tungsten strip and long tungsten strip concatenation constitute the square tungsten strip of one deck, four angles of square tungsten strip are the heat-generating body turning, every layer of tungsten strip successive layer stack that splices constitutes the heat-generating body, the seam of long tungsten strip and short tungsten strip staggers each other during the stack.
The long tungsten bar is longer than the short tungsten bar, and the short tungsten bar and the long tungsten bar are both formed by cutting rolled tungsten plates.
The seam allowance comprises a convex seam allowance and a concave seam allowance, the convex seam allowance and the concave seam allowance are respectively arranged on the long tungsten strip and the short tungsten strip, the two seam allowances are meshed with each other, and an expansion gap is reserved between the convex seam allowance and the concave seam allowance when the convex seam allowance and the concave seam allowance are meshed.
The expansion gap is 0.2-5 mm.
The corner of the heating body is a round angle.
The corner of the heating body is a right angle.
The invention has the beneficial effects that:
according to the invention, after the round heating element is changed into the square heating element, the sintered tungsten-molybdenum product can be flatly placed on the discharging bottom support, so that the bending deformation of the sintered material is improved to the maximum extent, the straightening and leveling process of the tungsten-molybdenum product is greatly reduced, and the product quality is improved.
The square heating body provided by the invention can increase the utilization rate of the hearth, and has the advantages of low energy consumption and high productivity.
The recovery rate of the scrapped square heating element material can reach more than 70 percent, a large amount of valuable tungsten material can be saved, the production consumption is greatly reduced, and the production cost is saved.
The following will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a front view of a heat generating body assembly.
FIG. 2 is a plan view of a heat-generating body assembly.
Fig. 3 a long tungsten bar.
Fig. 4 short tungsten bars.
Fig. 5 is a schematic view of a male end structure.
FIG. 6 is a schematic view of a female end structure.
Figure 7 corner single tang.
Figure 8 corner double seam allowance.
Fig. 9 corner stitching.
Fig. 10 corner laps.
In the figures, the reference numbers are: 1. a heating element; 2. short tungsten bars; 3. stopping the opening; 4. a long tungsten bar; 5. a corner of the heating element; 6. a male end; 7. a concave spigot.
Detailed Description
Example 1:
in order to overcome the problems of high energy consumption, low capacity and high cost in the prior art, the invention provides the square heating element device of the tungsten-molybdenum sintering furnace shown in the figures 1-10. The square heating body can increase the utilization rate of the hearth, the energy consumption is low, and the capacity is high. The recovery rate of the scrapped square heating element can reach more than 70 percent, a large amount of valuable tungsten materials can be saved, the production consumption is greatly reduced, and the production cost is saved.
A square heating element device of a tungsten-molybdenum sintering furnace comprises a short tungsten bar 2, a spigot 3 and a long tungsten bar 4; short tungsten 2 and long tungsten 4 pass through tang 3 and be connected, short tungsten 2 and long tungsten 4 concatenation form the square tungsten of form of one deck, four angles of square tungsten are the heat-generating body turning 5, every layer of tungsten successive layer stack that splices constitutes heat-generating body 1, the seam of long tungsten 4 and short tungsten 2 staggers each other during the stack.
In the invention, each layer of spliced tungsten bars are overlapped layer by layer to form the square heating body 1, the seams of the long tungsten bars 4 and the short tungsten bars 2 are staggered mutually, and each tungsten bar is in a free state without welding. After the service life of the heating element 1 is reached, the tungsten bar can be disassembled, and the tungsten bar with small deformation can be recycled for use in the manufacture of a new heating element, in the actual production, the recovery rate of the scrapped heating element material can reach more than 70 percent, a large amount of valuable tungsten materials can be saved, the production consumption is greatly reduced, and the production cost is saved. Meanwhile, the combination can adjust the size of the heating element by adjusting the length of the tungsten bar, and further adjust the gap between the heating element and the induction coil, so that the heat efficiency of the intermediate frequency furnace reaches the optimal state.
The invention is applied to a square tungsten-molybdenum induction sintering furnace, a square crucible is used as a heating body, and a square induction coil is used for induction heating. The highest temperature of the equipment is required to be 2500 ℃, and the material of the heating body 1 is selected to be a tungsten product; the heating element 1 is formed by rolling and cutting the tungsten bar; the required density of the tungsten bar of the heating body 1 can reach 18.5t/m3The above.
Example 2:
based on the embodiment 1, in this embodiment, the long tungsten bar 4 is longer than the short tungsten bar 2, and the short tungsten bar 2 and the long tungsten bar 4 are both cut from a rolled tungsten plate.
The seam allowance 3 comprises a convex seam allowance 6 and a concave seam allowance 7, the convex seam allowance 6 and the concave seam allowance 7 are respectively arranged on the long tungsten strip 4 and the short tungsten strip 2 and are meshed with each other, and an expansion gap is reserved when the convex seam allowance 6 and the concave seam allowance 7 are meshed with each other.
The expansion gap is 0.2-5 mm.
According to the invention, the short tungsten bar 2 and the long tungsten bar 4 are occluded through the seam allowance 3, the seam allowance 3 is divided into a convex seam allowance 6 shown in a figure 5 and a concave seam allowance 7 shown in a figure 6, and a certain amount of expansion gaps are reserved between the convex seam allowance 6 and the concave seam allowance 7 during occlusion, so that deformation of the tungsten bars is avoided when an induction magnetic field passes through.
Preferably, the corner 5 of the heating element is a round corner.
Preferably, the heating element corner 5 is a right angle.
According to the invention, the corner 5 of the heating element is specially treated, so that the influence of expansion with heat and contraction with cold of the tungsten bar on the heating element 1 at high temperature is avoided. The treatment protocol was as follows:
first, the corners are treated in the manner shown in fig. 7, the corners 5 are rounded, and the tungsten bars are engaged by using the seam allowance 3 during expansion, so as to avoid affecting the change of the overall size of the heating element 1.
Secondly, the corners are processed in a mode shown in fig. 8, the corners 5 are subjected to fillet transition, and the corners are occluded by adopting the whole tungsten strip with the seam allowance, so that the change of the whole size of the heating body 1 is avoided.
Thirdly, the corners are processed in the mode shown in fig. 9, the corners 5 are subjected to fillet transition, and a gap is ensured to be reserved between adjacent tungsten bars during transition, so that each tungsten bar is in a free expansion state, and the change of the whole size of the heating body 1 is avoided being influenced.
Fourthly, the corner is processed in the mode shown in fig. 10, the corner 5 is subjected to 90-degree right-angle transition, and a gap is ensured to be reserved between adjacent tungsten bars during transition, so that each tungsten bar is in a free expansion state, and the change of the whole size of the heating body 1 is avoided being influenced.
The square heating element provided by the invention is formed by splicing tungsten strips with different lengths, because the size of the heating element 1 is larger, the tungsten strips are divided into a plurality of parts to be spliced according to the processing capacity of a tungsten product, each side is formed by splicing 2 tungsten strips with different lengths, the tungsten strips are required to be rolled and cut, the required sections are the same, and the density is up to 18.5t/m3The above. Unsmooth tang 3 is used to interlock between long tungsten strip 4 and the short tungsten strip 2, and when the interlock between the unsmooth tang, leave the dilatation joint, the deformation of tungsten strip when avoiding induction magnetic field to pass through.
The corner 5 of the heating body needs to be specially processed, so that expansion with heat and contraction with cold between the tungsten bars at high temperature are avoided. Each layer of the spliced tungsten strips are overlapped layer by layer to form a cuboid shape, long tungsten strips 4 and short tungsten strips 2 are staggered during overlapping, each tungsten strip is in a free state and does not need to be welded, and when the tungsten strip stacking device is used, the butt joint surfaces of the upper tungsten strip and the lower tungsten strip are softened at high temperature and under the self-weight pressure of materials to easily form a conductive loop, so that a closed loop can be formed in adjacent tungsten strips through medium-frequency induced current.
Because each tungsten bar forming the heating element 1 is made of metal tungsten which is forged compactly in advance, the electric conductivity of the tungsten bar is much better than that of tungsten in a powder metallurgy state, the heat efficiency of the heating element is a normal set value from the beginning, and the transition process of metallization is avoided.
After the service life of the heating element 1 is reached, the tungsten bar can be disassembled, and the tungsten bar with small deformation can be recycled for use in the manufacture of a new heating element, in the actual production, the recovery rate of the scrapped heating element 1 can reach more than 70 percent, a large amount of valuable tungsten materials can be saved, the production consumption is greatly reduced, and the production cost is saved. Meanwhile, the combination can adjust the size of the heating element 1 by adjusting the length of the tungsten bar of the heating element 1, and further adjust the gap between the heating element 1 and the induction coil, so that the heat efficiency of the intermediate frequency furnace reaches the optimal state.
According to the invention, after the round heating element is changed into the square heating element, the sintered tungsten-molybdenum product can be flatly placed on the discharging bottom support, so that the bending deformation of the sintered material is improved to the maximum extent, the straightening and leveling process of the tungsten-molybdenum product is greatly reduced, and the product quality is improved.
The square heating body can increase the utilization rate of the hearth, the energy consumption is low, and the capacity is high. The recovery rate of the scrapped square heating element can reach more than 70 percent, a large amount of valuable tungsten materials can be saved, the production consumption is greatly reduced, and the production cost is saved.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention. The devices and their structural components not described in detail in this embodiment are well known in the art and commonly used in the industry, and will not be described herein.
Claims (6)
1. The utility model provides a square heat-generating body device of tungsten molybdenum fritting furnace which characterized in that: comprises a short tungsten bar (2), a spigot (3) and a long tungsten bar (4); short tungsten (2) and long tungsten (4) be connected through tang (3), short tungsten (2) and long tungsten (4) concatenation are constituteed one deck square form tungsten, four angles of square form tungsten are heat-generating body turning (5), every layer of tungsten successive layer stack that the concatenation is good constitutes heat-generating body (1), the seam of long tungsten (4) and short tungsten (2) staggers each other during the stack.
2. The square heating element device of the tungsten-molybdenum sintering furnace according to claim 1, characterized in that: the long tungsten bar (4) is longer than the short tungsten bar (2), and the short tungsten bar (2) and the long tungsten bar (4) are formed by cutting rolled tungsten plates.
3. The square heating element device of the tungsten-molybdenum sintering furnace according to claim 1, characterized in that: the seam allowance (3) comprises a convex seam allowance (6) and a concave seam allowance (7), the convex seam allowance (6) and the concave seam allowance (7) are respectively arranged on the long tungsten strip (4) and the short tungsten strip (2), the two seam allowances are meshed, and an expansion gap is reserved when the convex seam allowance (6) and the concave seam allowance (7) are meshed.
4. The square heating element device of the tungsten-molybdenum sintering furnace according to claim 3, characterized in that: the expansion gap is 0.2-5 mm.
5. The square heating element device of the tungsten-molybdenum sintering furnace according to claim 1, characterized in that: the corner (5) of the heating body is a round angle.
6. The square heating element device of the tungsten-molybdenum sintering furnace according to claim 1, characterized in that: the corner (5) of the heating body is a right angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910995936.5A CN110657673A (en) | 2019-10-18 | 2019-10-18 | Square heating element device of tungsten-molybdenum sintering furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910995936.5A CN110657673A (en) | 2019-10-18 | 2019-10-18 | Square heating element device of tungsten-molybdenum sintering furnace |
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| CN110657673A true CN110657673A (en) | 2020-01-07 |
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| CN201910995936.5A Pending CN110657673A (en) | 2019-10-18 | 2019-10-18 | Square heating element device of tungsten-molybdenum sintering furnace |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2262696Y (en) * | 1996-02-29 | 1997-09-17 | 本溪钨钼厂 | Heating body for intermediate frequency furnace |
| CN104534878A (en) * | 2014-12-19 | 2015-04-22 | 株洲硬质合金集团有限公司 | Tungsten/molybdenum crucible for high-temperature heating furnace and manufacturing method of tungsten/molybdenum crucible |
| CN207019480U (en) * | 2017-06-16 | 2018-02-16 | 金堆城钼业股份有限公司 | A kind of vertical intermediate frequency high temperature sintering furnace charge support |
| CN210980778U (en) * | 2019-10-18 | 2020-07-10 | 西安成航炉业有限公司 | Square heating element device of tungsten-molybdenum sintering furnace |
-
2019
- 2019-10-18 CN CN201910995936.5A patent/CN110657673A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2262696Y (en) * | 1996-02-29 | 1997-09-17 | 本溪钨钼厂 | Heating body for intermediate frequency furnace |
| CN104534878A (en) * | 2014-12-19 | 2015-04-22 | 株洲硬质合金集团有限公司 | Tungsten/molybdenum crucible for high-temperature heating furnace and manufacturing method of tungsten/molybdenum crucible |
| CN207019480U (en) * | 2017-06-16 | 2018-02-16 | 金堆城钼业股份有限公司 | A kind of vertical intermediate frequency high temperature sintering furnace charge support |
| CN210980778U (en) * | 2019-10-18 | 2020-07-10 | 西安成航炉业有限公司 | Square heating element device of tungsten-molybdenum sintering furnace |
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