A continuous discharge plasma hot pressing sintering furnace

Abstract

This invention provides a continuous discharge plasma hot pressing sintering furnace, including a furnace body with a sintering cavity. A first cylinder with a vertically downward-extending telescopic end is fixedly mounted at the top of the sintering cavity. An upper electrode is fixedly mounted on the telescopic end of the first cylinder. An upper pressure head electrically connected to the upper electrode is fixedly mounted at the end of the upper electrode away from the first cylinder. A second cylinder corresponding to the first cylinder is fixedly mounted at the bottom of the sintering cavity. The telescopic end of the second cylinder extends vertically towards the first cylinder. A lower electrode is fixedly mounted on the telescopic end of the second cylinder. A lower pressure head electrically connected to the lower electrode is fixedly mounted at the end of the lower electrode away from the second cylinder. Sintering components for continuously sintering strips are detachably mounted on the upper and lower pressure heads, respectively. A drive clamping component for moving the strip within the sintering cavity is also provided. This invention has the advantage of connecting and sintering strips.

Description

Technical Field

[0001] This invention relates to the field of sintering furnace design technology, and in particular to a continuous discharge plasma hot pressing sintering furnace. Background Technology

[0002] Spark plasma sintering (SPS) is a novel powder metallurgy sintering technology that involves loading metal powders into a mold made of materials such as graphite, applying specific sintering power and pressing pressure to the powder using upper and lower punches and energized electrodes, and then producing high-performance materials through discharge activation, thermoplastic deformation, and cooling. SPS is characterized by sintering under pressure; the plasma generated by the pulsed current and the pressure applied during the sintering process help lower the sintering temperature of the powder. The SP method delivers pulsed electrical energy into the gaps between powder particles in the pressed powder blank, converting the high-temperature plasma (discharge plasma) generated during the spark discharge into high-temperature plasma. It can be effectively applied to thermal diffusion and electric field diffusion, and can complete "sintering" or "sintering bonding" in a short time of about 5 to 20 minutes when the temperature is raised from low temperature to ultra-high temperature above 2000℃. It is a new technology for the synthesis and processing of new materials. This new technology is different from the traditional "discharge sintering method". It is applicable to a wide variety of materials. It can be used to synthesize composite materials including fiber / particle composite materials, graded functional materials, and dissimilar material bonding, as well as metallic materials including amorphous alloys, magnetic materials, intermetallic compounds, and hard alloys. It may also be used for the structural control of porous materials. Its application prospects are very broad.

[0003] In the existing technology, there is no sintering furnace specifically designed for continuous sintering of long strip-shaped metal materials. For example, the invention patent disclosed in the authorization announcement number CN 214666072 U, entitled "SPS Sintering Furnace Pressure Head Structure", can only sinter powdered materials in a single operation and cannot continuously sinter strip-shaped materials. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a continuous discharge plasma hot pressing sintering furnace, which solves the technical problem mentioned in the background art that existing sintering furnaces cannot effectively perform continuous sintering of strip materials.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] A continuous discharge plasma hot pressing sintering furnace includes a sintering furnace body and support feet installed at the bottom of the sintering furnace body. A sintering cavity is formed within the sintering furnace body. A first cylinder with a vertically downward extending telescopic end is fixedly mounted at the top of the sintering cavity. An upper electrode is fixedly mounted on the telescopic end of the first cylinder. An upper pressure head electrically connected to the upper electrode is fixedly mounted at the end of the upper electrode away from the first cylinder. A second cylinder corresponding to the first cylinder is also fixedly mounted at the bottom of the sintering cavity. The telescopic end of the second cylinder extends vertically towards the first cylinder. A lower electrode is fixedly mounted on the telescopic end of the second cylinder. A lower pressure head electrically connected to the lower electrode is fixedly mounted at the end of the lower electrode away from the second cylinder. Sintering components for continuously sintering strips are respectively and detachably mounted on the upper and lower pressure heads. A drive clamping component for driving the strip to move within the sintering cavity is also provided within the sintering cavity.

[0007] Working principle:

[0008] This invention is a continuous discharge plasma hot pressing sintering furnace, which mainly utilizes plasma discharge to continuously hot press and sinter strips. The specific sintering process is described in the invention patent with announcement number CN 106238732 B and titled "A Discharge Plasma Sintering System". Since plasma heating sintering is existing technology, it will not be described in detail in this document.

[0009] In use, the various strips to be processed are first placed in the sintering cavity of the sintering furnace body and fixed between the sintering components at the ends of the upper and lower pressure heads by the drive clamping assembly.

[0010] After installation, by adjusting the first cylinder and the second cylinder, the upper electrode and the lower electrode at the telescopic end of the first cylinder and the second cylinder are moved in opposite directions, which further drives the upper pressure head and the lower pressure head at the upper electrode and the lower motor end to move in opposite directions until the various strips are clamped between the sintering components on the upper pressure head and the lower pressure head.

[0011] After adjustment, power is supplied to the upper and lower electrodes to sinter various strips in the sintering assembly between the upper and lower pressure heads. Then, the drive clamping assembly is turned on to move the strips within the sintering furnace body and perform continuous hot pressing sintering between the sintering assemblies.

[0012] Beneficial effects achieved:

[0013] First, it is equipped with a first cylinder and a second cylinder, which can effectively drive the upper pressure head and the lower pressure head to move in opposite directions, conveniently confining the various strip materials to be processed between the sintering components at the ends of the upper and lower pressure heads and hot pressing and sintering the strip materials.

[0014] Secondly, it is equipped with a drive clamping assembly, which can effectively fix the strip in the sintering cavity and drive the strip to move in the sintering cavity, making it convenient for workers to install and connect the hot pressing sintering operation of the strip.

[0015] Third, the sintering components can be detachably installed at the ends of the upper and lower pressure heads, which can effectively facilitate the disassembly and replacement of the sintering components by the staff, and further expand the sintering of different types of strip materials. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the overall structure of Embodiment 1 of the present invention;

[0017] Figure 2 for Figure 1 Top view of the structure;

[0018] Figure 3 This is a schematic cross-sectional view of the overall structure of Embodiment 2 of the present invention;

[0019] Figure 4 for Figure 3 Top view of the structure.

[0020] In the above attached figures: 1. Sintering furnace body; 2. Support leg; 3. Sintering cavity; 4. First cylinder; 5. Second cylinder; 6. Upper electrode; 7. Lower electrode; 8. Upper pressure head; 9. Lower pressure head; 10. Upper mounting block; 11. Lower mounting block; 12. Upper rolling roller; 13. Lower rolling roller; 14. First mounting groove; 15. First bolt; 16. First nut; 17. Placement shaft; 18. Drive shaft; 19. Drive motor; 20. First isolation plate; 21. First through hole; 22. First support frame; 23. First support wheel; 24. 25. Limiting frame; 26. Limiting plate; 27. Guide shaft; 28. Upper fixing block; 29. ​​Lower fixing block; 30. Upper connecting plate; 31. Lower connecting plate; 32. Support roller; 33. Second mounting groove; 34. Second bolt; 35. Second nut; 36. Drive cylinder; 37. Clamping block; 38. First limiting bolt; 39. Second limiting bolt; 40. Clamping plate; 41. Clamping groove; 42. Sliding groove; 43. Second isolation plate; 44. Second through hole; 45. Second support frame; 46. Second support wheel; 47. Sealing door. Detailed Implementation

[0021] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Example 1:

[0023] Reference Figure 1 and Figure 2This invention relates to a continuous discharge plasma hot pressing sintering furnace, primarily for hot pressing sintering of soft material strips. It includes a sintering furnace body 1 and support legs 2 installed at the bottom of the furnace body 1. A sintering cavity 3 is formed within the furnace body 1. A first cylinder 4 with a vertically downward extending telescopic end is fixedly mounted at the top of the sintering cavity 3. An upper electrode 6 is fixedly mounted on the telescopic end of the first cylinder 4. An upper pressure head 8, electrically connected to the upper electrode 6, is fixedly mounted at the end of the upper electrode 6 away from the first cylinder 4. A second cylinder 5, corresponding to the first cylinder 4, is fixedly mounted at the bottom of the sintering cavity 3. The telescopic end of the second cylinder 5 extends vertically towards the first cylinder 4. A lower electrode 7 is fixedly mounted on the telescopic end of the second cylinder 5. A lower pressure head 9, electrically connected to the lower electrode 7, is fixedly mounted at the end of the lower electrode 7 away from the second cylinder 5. The upper pressure head 8 and the lower pressure head 9 are respectively and detachably provided with sintering components for continuous sintering of strip. The sintering components include an upper mounting block 10, a lower mounting block 11, an upper rolling roller 12, and a lower rolling roller 13. The upper pressure head 8 and the lower pressure head 9 are each provided with a plurality of first bolts 15. The upper mounting block 10 and the lower mounting block 11 are each provided with a plurality of first nuts 16 corresponding to the first bolts 15. The plurality of first bolts 15 pass through the upper pressure head 8 and the lower pressure head 9 and are threadedly connected to the plurality of first nuts 16 on the upper mounting block 10 and the lower mounting block 11, respectively. The bottom of the upper mounting block 10 and the top of the lower mounting block 11 are respectively provided with first mounting grooves 14. The upper rolling roller 12 and the lower rolling roller 13 are parallel to each other and are respectively horizontally rotatably mounted in the first mounting grooves 14 at the bottom of the upper mounting block 10 and the top of the lower mounting block 11. This configuration effectively drives the upper rolling roller 12 and the lower rolling roller to move in opposite directions via the first cylinder 4 and the second cylinder 5, and clamps the strip between the upper rolling roller 12 and the lower rolling roller 13. Then, the strip between the upper rolling roller 12 and the lower rolling roller 13 is sintered by the current from the upper electrode and the lower electrode 7.

[0024] like Figure 1As shown, the sintering cavity 3 is also equipped with a drive clamping assembly for moving the strip within the sintering cavity 3. The drive clamping assembly includes several placement shafts 17 for placing the strip and drive shafts 18 for moving the strip. The placement shafts 17 are all parallel to the upper rolling roller 12 and are rotatably mounted on the side wall of the sintering cavity 3, arranged vertically and horizontally respectively. The drive shafts 18 are parallel to the placement shafts 17, with one end of the drive shaft 18 rotatably mounted on the side wall of the sintering cavity 3 away from the placement shafts 17. The other end of the drive shaft 18 slides horizontally through the side wall of the sintering cavity 3 and extends outward. A drive motor 19 is also provided on the outer side wall of the sintering furnace body 1. The output end of the drive motor 19 is fixedly connected to the end of the drive shaft 18 that extends out of the sintering furnace body 1. This setup effectively places the strip to be processed onto several corresponding placement shafts 17, and simultaneously stretches the strip on several placement shafts 17, so that the strip passes through the upper rolling roller 12 and the lower rolling roller 13 together and is fixed on the drive shaft 18, and is driven by the drive shaft 18 to move the strip in the sintering cavity 3.

[0025] like Figure 1 As shown, two first isolation plates 20 are fixedly provided inside the sintering cavity 3 and on both sides of the sintering assembly. Each of the two first isolation plates 20 has a first through hole 21. Each of the two first isolation plates 20 has a first support assembly on the side away from the sintering assembly. The first support assembly includes a first support frame 22 and a first support wheel 23. The first support frame 22 is fixedly installed on the first isolation plate 20 and below the first through hole 21. The first support wheel 23 is rotatably installed on the top of the first support frame 22. A limiting frame 24 is also provided above the first support frame 22. One end of the limiting frame 24 is fixedly installed on the side wall of the first isolation plate 20 above the first through hole 21. Two limiting plates 25 are rotatably provided on the limiting frame 24. A guide shaft 26 is rotatably provided between the two limiting plates 25. The first partition plate 20 effectively divides the sintering cavity 3 into three spaces and, to a certain extent, effectively insulates the sintering area through the partition of the first partition plate 20, thereby improving the efficiency of strip sintering. The first support wheel 23 and guide wheel are provided to effectively support the strip, making the strip more stable for hot pressing sintering. A sealing door 46 is also slidably provided on the side wall of the sintering furnace body 1.

[0026] Working principle:

[0027] In use, first open the sealing door 46 and place the various soft strips to be processed onto the placement shaft 17 inside the sintering cavity 3. Then, the strips on the placement shaft 17 are simultaneously pulled up and pass sequentially between the first through hole 21 on the left side of the sintering assembly and between the upper rolling roller 12 and the lower rolling roller 13, and extend out from the first through hole 21 on the right side of the sintering assembly onto the fixed drive shaft 18. Then, rotate the guide plates on the first isolation plates 20 on both sides to squeeze the strips under the guide rollers and restrict the strips between the guide rollers and the first support roller 23. Then, by adjusting the first cylinder 4 and the second cylinder 5, the first cylinder 4 and the second cylinder 5 are driven respectively. 5. The upper electrode and lower electrode 7 at the telescopic end move in opposite directions, further driving the upper pressure head 8 and lower pressure head 9 at the upper electrode and lower motor ends to move in opposite directions until the various strips are clamped between the upper rolling roller 12 and the lower rolling roller 13. After the adjustment is completed, the power is turned on to the upper electrode 6 and the lower electrode 7, so that the various strips are sintered in the sintering assembly between the upper pressure head 8 and the lower pressure head 9. Then the drive motor 19 is turned on, so that the drive motor 19 drives the drive shaft 18 to rotate, so that the strips move in the sintering cavity 3 and are continuously hot-pressed and sintered between the upper rolling roller 12 and the lower rolling roller 13.

[0028] Example 2:

[0029] Reference Figure 3 and Figure 4A continuous discharge plasma hot pressing sintering furnace is mainly used for hot pressing sintering of rigid strips. It includes a furnace body 1 and support legs 2 installed at the bottom of the furnace body 1. A sintering cavity 3 is formed inside the furnace body 1. A first cylinder 4 with a vertically downward extending telescopic end is fixedly mounted on the top of the sintering cavity 3. An upper electrode 6 is fixedly mounted on the telescopic end of the first cylinder 4. An upper pressure head 8 electrically connected to the upper electrode 6 is fixedly mounted at the end of the upper electrode 6 away from the first cylinder 4. A second cylinder 5 corresponding to the first cylinder 4 is also fixedly mounted at the bottom of the sintering cavity 3. The telescopic end of the second cylinder 5 extends vertically towards the first cylinder 4. A lower electrode 7 is fixedly mounted on the telescopic end of the second cylinder 5. A lower pressure head 9 electrically connected to the lower electrode 7 is fixedly mounted at the end of the lower electrode 7 away from the second cylinder 5. The upper pressure head 8 and the lower pressure head 9 are respectively and detachably equipped with tools for connecting the strip. The sintering assembly for continuous sintering includes an upper fixing block 27, a lower fixing block 28, an upper connecting plate 29, a lower connecting plate 30, and a plurality of supporting rollers 31. The upper pressure head 8 and the lower pressure head 9 are each provided with a plurality of second bolts 33. The upper fixing block 27 and the lower fixing block 28 are each provided with a plurality of second nuts 34 corresponding to the second bolts 33. The plurality of second bolts 33 pass through the upper pressure head 8 and the lower pressure head 9 and are threadedly connected to the plurality of second nuts 34 on the upper fixing block 27 and the lower fixing block 28, respectively. The upper connecting plate 29 is fixedly installed at the bottom of the upper fixing block 27, and the lower connecting plate 30 is fixedly installed at the top of the lower fixing block 28. The bottom of the upper connecting plate 29 and the top of the lower connecting plate 30 are each provided with a second mounting groove 32. The plurality of supporting rollers 31 are respectively and horizontally rotatably installed in the second mounting grooves 32 at the bottom of the upper connecting plate 29 and the top of the lower connecting plate 30. This configuration effectively drives the support rollers 31 at the ends of the upper and lower connecting blocks to move in opposite directions via the first cylinder 4 and the second cylinder 5, and clamps the strip between the support rollers 31 at the ends of the upper and lower connecting blocks. Then, the strip between the support rollers 31 is sintered by the current from the upper electrode and the lower electrode 7.

[0030] like Figure 3As shown, the sintering cavity 3 is further provided with a driving clamping assembly for moving the strip within the sintering cavity 3. The driving clamping assembly includes two driving cylinders 35 and two clamping heads. The two driving cylinders 35 are respectively fixedly installed on the side walls on both sides of the sintering cavity 3. The telescopic ends of the two driving cylinders 35 are opposite each other and the telescopic direction is perpendicular to the axis of the supporting roller 31. The two clamping heads are respectively fixedly installed on the telescopic ends of the two driving cylinders 35. Each clamping head includes a clamping block 36, a plurality of first limiting bolts 37, a plurality of second limiting bolts 38, and a clamping plate 39. The clamping block 36 is fixedly installed on the telescopic end of the drive cylinder 35. A clamping groove 40 is formed on the side of the clamping block 36 away from the telescopic end of the drive cylinder 35. A sliding groove 41 is also provided at the bottom of the clamping groove 40. One end of the clamping plate 39 is slidably installed in the sliding groove 41. Several first limiting bolts 37 are located at the top of the clamping block 36 and are threaded vertically downwards through the side wall of the clamping block 36 and extend into the clamping groove 40. Several second limiting bolts 38 are located at the bottom of the clamping block 36 and are threaded vertically upwards through the side wall of the clamping block 36 and abut against the bottom of the clamping plate 39 in the clamping groove 40. This arrangement allows the strip material to be placed on the clamping plates 39 at both ends. By adjusting the second limiting bolts 38, the clamping plates 39 slide within the sliding groove 41, further moving the strip material within the clamping groove 40. Then, the abutment between the first limiting bolts 37 and the strip material fixes the strip material within the clamping groove 40.

[0031] like Figure 3 As shown, two second isolation plates 42 are fixedly installed inside the sintering cavity 3 and on both sides of the sintering assembly. Each of the two first isolation plates 20 has a second through hole 43. A second support assembly is provided on the side of each of the two second isolation plates 42 away from the sintering assembly. The second support assembly includes a second support frame 44 and a second support wheel 45. The second support frame 44 is fixedly installed on the second isolation plate 42 and below the second through hole 43. The second support wheel 45 is rotatably installed on the top of the second support frame 44. This arrangement allows the strip material to be placed on the second support wheel 45 first, and then clamped by the clamping heads on both sides, facilitating the installation and clamping of the strip material by the operator. A sealing door 46 is also slidably installed on the side wall of the sintering furnace body 1.

[0032] Working principle:

[0033] In use, first open the sealing door 46 and place the various rigid strips to be processed between the upper connecting plate 29 and the lower connecting plate 30. The two sides of the strip are placed on the second support wheels 45 on the second support frame 44. Then, by adjusting the drive cylinders 35 on both sides, the clamping blocks 36 at the ends of the drive cylinders 35 move towards both ends of the strip, causing the two sides of the strip to extend into the clamping grooves 40 on the clamping blocks 36. The strip is then fixed in the clamping grooves 40 by adjusting the first limiting bolt 37 and the second limiting bolt 38. Finally, by adjusting the first cylinder 4 and the second cylinder 5, the first cylinder 4 and the second cylinder 5 are driven respectively. 5. The upper electrode and lower electrode 7 at the telescopic end move in opposite directions, further driving the upper pressure head 8 and lower pressure head 9 at the upper electrode and lower motor ends to move in opposite directions until the various strips are clamped between the support rollers 31 at the ends of the upper connecting plate 29 and the lower connecting plate 30. After the adjustment is completed, the power is turned on to the upper electrode 6 and the lower electrode 7, so that the various strips are sintered in the sintering assembly between the upper pressure head 8 and the lower pressure head 9. The drive cylinders 35 on both sides are operated to make the strips move repeatedly between the support rollers 31 at the ends of the upper connecting plate 29 and the lower connecting plate 30 and perform hot pressing sintering on the strips.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A continuous discharge plasma hot pressing sintering furnace, comprising a sintering furnace body (1) and support feet (2) installed at the bottom of the sintering furnace body (1), wherein a sintering cavity (3) is formed inside the sintering furnace body (1), characterized in that: The top of the sintering cavity (3) is fixedly provided with a first cylinder (4) with its telescopic end extending vertically downward. An upper electrode (6) is fixedly provided on the telescopic end of the first cylinder (4). An upper pressure head (8) electrically connected to the upper electrode (6) is fixedly provided at the end of the upper electrode (6) away from the first cylinder (4). The bottom of the sintering cavity (3) is also fixedly provided with a second cylinder (5) corresponding to the first cylinder (4). The telescopic end of the second cylinder (5) extends vertically toward the first cylinder (4). A lower electrode (7) is fixedly provided on the telescopic end of the second cylinder (5). A lower pressure head (9) electrically connected to the lower electrode (7) is fixedly provided at the end of the lower electrode (7) away from the second cylinder (5). The upper pressure head (8) and the lower pressure head (9) are respectively provided with sintering components for continuous sintering of the strip. The sintering cavity (3) is also provided with a driving clamping component for driving the strip to move within the sintering cavity (3). The sintering assembly includes an upper fixing block (27), a lower fixing block (28), an upper connecting plate (29), a lower connecting plate (30), and several supporting rollers (31). The upper fixing block (27) is detachably fixedly connected to the upper pressure head (8), and the lower fixing block (28) is detachably fixedly connected to the lower pressure head (9). The upper connecting plate (29) is fixedly installed at the bottom of the upper fixing block (27), and the lower connecting plate (30) is fixedly installed at the top of the lower fixing block (28). The bottom of the upper connecting plate (29) and the top of the lower connecting plate (30) are both provided with second mounting grooves (32). Several supporting rollers (31) are respectively and horizontally rotated in the second mounting grooves (32) at the bottom of the upper connecting plate (29) and the top of the lower connecting plate (30). The upper pressure head (8) and the lower pressure head (9) are each provided with a number of second bolts (33), and the upper fixing block (27) and the lower fixing block (28) are each provided with a number of second nuts (34) corresponding to the second bolts (33). The number of second bolts (33) pass through the upper pressure head (8) and the lower pressure head (9) respectively and are threadedly connected to the number of second nuts (34) on the upper fixing block (27) and the lower fixing block (28). The drive clamping assembly includes two drive cylinders (35) and two clamping heads. The two drive cylinders (35) are respectively fixedly installed on the side walls on both sides of the sintering cavity (3). The extension and retraction ends of the two drive cylinders (35) are opposite each other and the extension and retraction directions are perpendicular to the axis of the supporting roller (31). The two clamping heads are respectively fixedly installed on the extension and retraction ends of the two drive cylinders (35). The clamping head includes a clamping block (36), a plurality of first limiting bolts (37), a plurality of second limiting bolts (38), and a clamping plate (39). The clamping block (36) is fixedly installed on the telescopic end of the drive cylinder (35). A clamping groove (40) is provided inward on the side of the clamping block (36) away from the telescopic end of the drive cylinder (35). A sliding groove (41) is also provided at the bottom of the clamping groove (40). One end of the clamping plate (39) is slidably installed in the sliding groove (41). A plurality of first limiting bolts (37) are located at the top of the clamping block (36) and are vertically threaded downward through the side wall of the clamping head and extend into the clamping groove (40). A plurality of second limiting bolts (38) are located at the bottom of the clamping block (36) and are vertically threaded upward through the side wall of the clamping block (36) and abut against the bottom of the clamping plate (39) in the clamping groove (40). Two second isolation plates (42) are fixedly provided in the sintering cavity (3) and on both sides of the sintering assembly. Each of the two second isolation plates (42) has a second through hole (43). Each of the two second isolation plates (42) has a second support assembly on the side away from the sintering assembly. The second support assembly includes a second support frame (44) and a second support wheel (45). The second support frame (44) is fixedly installed on the second isolation plate (42) and below the second through hole (43). The second support wheel (45) is rotatably installed on the top of the second support frame (44).

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