Cold sintering production equipment

Abstract

The utility model relates to the technical field of cold sintering equipment, in particular to cold sintering production equipment. A machine table, a lifting driving mechanism fixedly connected to the bottom of the machine table, a lower die set connected with the output end of the lifting driving mechanism, a forming die detachably arranged on the top of the lower die set, an upper pressing die detachably inserted into the top of the forming die, and a supporting top pressing frame fixedly connected with the fixed end of the lifting driving mechanism or the top of the machine table are adopted. The cold sintering heating mechanism is fixedly connected to the supporting top pressing frame and located above the upper pressing mold; the upper pressing die, the forming die and the lower die set are used for restraining cold sintering materials, the forming dies and the upper pressing dies of different specifications can be detached and replaced according to actual requirements to meet the size and other precision requirements of cold sintering products, compared with a traditional cold sintering experimental device, the cold sintering production equipment avoids manual pressing through a manual pressing machine, the labor intensity is reduced, and the production efficiency is improved. And the production efficiency is higher, the quality of a cold-sintered product is better, and the large-scale commercial production requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of cold sintering equipment, in particular to a cold sintering production equipment. Background Art

[0002] Cold Sintering Process (CSP) can process and sinter ceramics under pressure of 300-500Mpa and temperature of 100-400℃. This method can save energy and make it possible to manufacture new materials with high commercial potential. Cold sintered materials can be used as positive and negative electrode materials for batteries to improve the energy density and cycle performance of batteries; they can also be used to prepare sensitive materials for sensors to improve the performance of sensors; in the field of electronic packaging, cold sintered materials can replace traditional metal materials to improve the reliability and durability of packaging; in addition, cold sintered materials can also be used to prepare high-density and high-strength insulating materials for the insulation of electrical equipment such as cables and transformers.

[0003] The main stages of the cold sintering process usually involve particle rearrangement, material dissolution, liquid phase precipitation, the formation of amorphous phase / intermediate phase, and grain growth or recrystallization of the amorphous phase. The existing cold sintering equipment is still in the crude experimental stage for laboratory use. The cold sintering experimental device mainly includes a manual press and two hot pressing plates. The temperature is controlled by a temperature controller. The two hot pressing plates press the cold sintering material to obtain a cold sintered product. Since the equipment is in the experimental stage, and the cold sintering material mainly uses powder materials mixed with a transient liquid phase (water or other solvents) that can partially dissolve it, there is diffusion in the process of the two hot pressing plates pressing the cold sintering material. The precision requirements for the size of the cold sintered product are low, and it is difficult to commercially produce qualified cold sintered products on a large scale. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the utility model aims to provide a cold sintering production equipment.

[0005] The purpose of the utility model is achieved through the following technical solutions: a cold sintering production equipment, including a machine platform, a lifting drive mechanism fixedly connected to the bottom of the machine platform, a lower die group connected to the output end of the lifting drive mechanism, a forming die detachably arranged on the top of the lower die group, an upper die detachably inserted on the top of the forming die, a supporting top pressing frame fixedly connected to the fixed end of the lifting drive mechanism or the top of the machine platform, and a cold sintering heating mechanism fixedly connected to the supporting top pressing frame and located above the upper die, the machine platform is provided with a lower die giving way through hole for giving way to the lower die group, the upper die and the lower die group cooperate to compress the cold sintering material, and the lifting drive mechanism is used to drive the lower die group to rise and fall; when the lifting drive mechanism drives the lower die group to rise, the upper die, the forming die and the lower die group extend into the cold sintering heating mechanism in sequence, and the top surface of the upper die is pressed against the supporting top pressing frame.

[0006] Preferably, the forming die is provided with at least one feed through hole, and a pressing cavity for accommodating cold sintering material is formed between the feed through hole and the lower die set; a pressing block is extended from the bottom of the upper die and extends into the feed through hole and is used to cooperate with the lower die set to press the cold sintering material, and the number of the pressing blocks corresponds to the number of the feed through holes.

[0007] Preferably, a flared opening connected to the feed through hole is provided on the top of the forming die, and the pressing block extends into the feed through hole along the flared opening.

[0008] Preferably, the supporting top pressure frame includes a top pressure plate and a plurality of pull rods each having one end fixedly connected to the top pressure plate, the other ends of the plurality of pull rods each being fixedly connected to the fixed end of the lifting drive mechanism or the top of the machine platform, the cold sintering heating mechanism is fixedly connected to the bottom of the top pressure plate and is located directly above the upper die, and the top pressure plate is used for limiting and pressing the upper die.

[0009] Preferably, the cold sintering heating mechanism is a cylindrical air heater.

[0010] Preferably, the lifting drive mechanism includes a first connecting rod fixedly connected to the bottom of the machine platform, a first flange seat connected to the first connecting rod, a reduction motor connected to the first flange seat, a screw rod passing through the first flange seat and connected to the output end of the reduction motor, a guide cylinder fixedly connected to the first flange seat, and a transmission nut that is slidably and lifted in the guide cylinder and cooperates with the screw rod thread, and the top of the transmission nut is fixedly connected to the lower mold assembly.

[0011] Preferably, the lifting drive mechanism includes a second connecting rod fixedly connected to the bottom of the machine platform, a second flange seat connected to the second connecting rod, and a hydraulic cylinder connected to the second flange seat, and the output end of the hydraulic cylinder is fixedly connected to the lower mold assembly.

[0012] The beneficial effects of the utility model are as follows: the cold sintering production equipment of the utility model adopts a machine platform, a lifting drive mechanism fixedly connected to the bottom of the machine platform, a lower die group connected to the output end of the lifting drive mechanism, a forming die detachably arranged on the top of the lower die group, an upper pressing die detachably inserted on the top of the forming die, a supporting top pressing frame fixedly connected to the fixed end of the lifting drive mechanism or the top of the machine platform, and a cold sintering heating mechanism fixedly connected to the supporting top pressing frame and located above the upper pressing die; the upper pressing die, the forming die and the lower die group are used to constrain the cold sintering material, and the forming die and the upper pressing die of different specifications can be disassembled and replaced according to actual needs to meet the precision requirements such as the size of the cold sintered product. Compared with the traditional cold sintering experimental device, the cold sintering production equipment avoids the manual use of a manual press to press, reduces the labor intensity, and has higher production efficiency and better quality of cold sintered products, meeting the needs of large-scale commercial production of qualified cold sintered products, and is particularly suitable for low-temperature densification of functional ceramics, solid electrolytes, organic-inorganic composite materials, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a top view of the utility model;

[0015] Figure 3 yes Figure 2 Sectional view of AA in the middle;

[0016] Figure 4 It is a partial structural schematic diagram of the utility model;

[0017] Figure 5 It is a partial exploded schematic diagram of the utility model;

[0018] Figure 6 yes Figure 5 A magnified schematic diagram of B.

[0019] The accompanying drawings are marked as follows: 1. machine; 2. cold sintering heating mechanism; 3. lifting drive mechanism; 31. first connecting rod; 32. first flange seat; 33. reduction motor; 34. screw rod; 35. guide cylinder; 36. transmission nut; 4. lower die assembly; 41. pressure head; 42. lower die seat; 43. sintering die; 5. forming die; 6. upper die; 7. supporting top pressure frame; 71. top pressure plate; 72. pull rod; 8. lower die clearance hole; 9. feed hole; 10. pressing block; 11. expansion; 12. limiting groove; 13. guide slide; 14. lifting slide block; 15. force measuring fixed seat; 16. force measuring sensor; 17. probe jack; 18. probe clearance hole; 19. temperature probe; 20. cold sintering product. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0021] like Figure 1-6 As shown, a cold sintering production equipment comprises a machine table 1, a lifting drive mechanism 3 fixedly connected to the bottom of the machine table 1, a lower die set 4 connected to the output end of the lifting drive mechanism 3, a forming die 5 detachably arranged on the top of the lower die set 4, an upper pressing die 6 detachably inserted on the top of the forming die 5, a supporting top pressing frame 7 fixedly connected to the fixed end of the lifting drive mechanism 3 or the top of the machine table 1, and a cold sintering heating mechanism 2 fixedly connected to the supporting top pressing frame 7 and located above the upper pressing die 6, the machine table 1 is provided with a lower die making way through hole 8 for making way for the lower die set 4, the upper pressing die 6 and the lower die set 4 are used to compress the cold sintering material, and the lifting drive mechanism 3 is used to drive the lower die set 4 to rise and fall; when the lifting drive mechanism 3 drives the lower die set 4 to rise, the upper pressing die 6, the forming die 5 and the lower die set 4 are sequentially extended into the cold sintering heating mechanism 2, and the top surface of the upper pressing die 6 is pressed against the supporting top pressing frame 7.

[0022] The cold sintering production equipment comprises a machine platform 1, a lifting drive mechanism 3 fixedly connected to the bottom of the machine platform 1, a lower die set 4 connected to the output end of the lifting drive mechanism 3, a forming die 5 detachably arranged on the top of the lower die set 4, an upper die 6 detachably inserted on the top of the forming die 5, a supporting top pressing frame 7 fixedly connected to the fixed end of the lifting drive mechanism 3 or the top of the machine platform 1, and a cold sintering heating mechanism 2 fixedly connected to the supporting top pressing frame 7 and located above the upper die 6; when in use, the upper die 6 is taken out, the cold sintering material is put into the forming die 5, and then the upper die 6 is inserted back into the forming die 5, the lifting drive mechanism 3 drives the lower die set 4 to rise, and the upper die 6, the forming die 5 and the lower die set 4 are sequentially extended into the cold sintering heating mechanism 2 until the top surface of the upper die 6 is pressed against the supporting top pressing frame 7, so that the upper die 6 and the lower die set 4 cooperate to press the cold sintering. The material is heated and the cold sintering heating mechanism 2 is used to heat the material. The cold sintered material is heated and pressurized to help the rearrangement of particles and the re-precipitation of solid materials to form a cold sintered product 20 of a specific size. The lifting drive mechanism 3 then drives the lower die set 4 to reset, and the upper die 6 and the forming die 5 are taken out, so that the cold sintered product 20 can be taken out quickly, which is convenient, flexible and fast. The upper die 6, the forming die 5 and the lower die set 4 are used to constrain the cold sintered material. The forming die 5 and the upper die 6 of different specifications can be disassembled and replaced according to actual needs to meet the precision requirements such as the size of the cold sintered product 20. Compared with the traditional cold sintering experimental device, the cold sintering production equipment avoids the use of manual presses for pressing, reduces labor intensity, has higher production efficiency, and has better quality of cold sintered products 20, which meets the needs of large-scale commercial production of qualified cold sintered products 20.

[0023] Furthermore, the forming die 5 is provided with at least one feed hole 9, and a pressing cavity for accommodating cold sintering material is formed between the feed hole 9 and the lower die set 4; a pressing block 10 is extended from the bottom of the upper die 6 and extends into the feed hole 9 and is used to cooperate with the lower die set 4 to press the cold sintering material, and the number of the pressing blocks 10 corresponds to the number of the feed holes 9. The cold sintering material is loaded into the forming die 5 from the feed hole 9, and the cold sintering material is constrained by the pressing cavity. When the top surface of the upper die 6 is pressed against the supporting top pressing frame 7, the pressing block 10 cooperates with the lower die set 4 to apply pressure to the cold sintering material, so as to form a cold sintered product 20 of a specific size. A plurality of feed through holes 9 are used to facilitate multi-station processing. In the present embodiment, the number of the feed through holes 9 is 5, and the 5 feed through holes 9 are evenly distributed on the forming die 5. The 5 pressing blocks 10 are correspondingly provided with 5 so that the cold sintering production equipment can produce 5 cold sintered products 20 at the same time, which significantly improves the production efficiency and meets the demand for large-scale commercial production of qualified cold sintered products 20.

[0024] Furthermore, a flared opening 11 connected to the feed through hole 9 is provided on the top of the molding die 5, and the pressing block 10 extends into the feed through hole 9 along the flared opening 11, which is more conducive to inserting the pressing block 10 into the feed through hole 9 along the flared opening 11, thereby improving assembly efficiency.

[0025] Furthermore, there is a gap space between the outer wall of the pressing block 10 and the inner wall of the feed through hole 9, and the spacing of the gap space is 0.02-0.3 mm; the top of the forming mold 5 and the bottom of the pressing block 10 are coated with a PTFE anti-stick coating. Controlling the spacing of the gap space to 0.02-0.3 mm is conducive to the solvent volatilization along the gap space during the heating and pressurization process of the cold sintering material, and at the same time avoiding the cold sintering material from diffusing into the gap space and clamping the material during the compaction process due to the gap being too large, which is conducive to ensuring the accuracy of the cold sintered product 20; preferably, the spacing of the gap space is 0.1 mm. The PTFE anti-stick coating is set to facilitate demolding, which is conducive to preventing the product from sticking to the mold after cold sintering and making it difficult to remove the cold sintered product 20.

[0026] Furthermore, a limiting groove 12 is concavely formed on the top of the lower die set 4, and the bottom of the forming die 5 abuts against the limiting groove 12 to prevent the forming die 5 from being out of position and affecting the use of the entire production equipment; the bottom surface of the limiting groove 12 is a plane, so that the lower die set 4 and the pressing block 10 can press the cold sintered material into a sheet. Furthermore, the bottom surface of the limiting groove 12 and the bottom of the pressing block 10 are coated with a PTFE anti-stick coating.

[0027] Further, the lower die set 4 includes a pressure head 41 connected to the output end of the lifting drive mechanism 3, and a lower die base 42 fixedly connected to the top of the pressure head 41, and the limiting groove 12 is recessed at the top of the lower die base 42. The pressure head 41 and the lower die base 42 cooperate with each other so that the surface of the limiting groove 12 is evenly stressed when pressurizing.

[0028] Further, the supporting top pressing frame 7 includes a top pressing plate 71, and a plurality of tie rods 72 each having one end fixedly connected to the top pressing plate 71, and the other ends of the plurality of tie rods 72 are each fixedly connected to the fixed end of the lifting drive mechanism 3 or the top of the machine platform 1, and the cold sintering heating mechanism 2 is fixedly connected to the bottom of the top pressing plate 71 and is located directly above the upper die 6, and the top pressing plate 71 is used to limit the upper die 6; when the lifting drive mechanism 3 drives the lower die 4 to rise, the upper die 6, the forming die 5 and the lower die 4 are sequentially extended into the cold sintering heating mechanism 2 until the top surface of the upper die 6 is pressed against the top pressing plate 71, and the top pressing plate 71 is used to limit the upper die 6 from continuing to rise, at which time, there is a pressure between the upper die 6 and the lower die to compress the cold sintering material, and as the lifting drive mechanism 3 drives the lower die 4 upward, the greater the force, the greater the pressure. In this embodiment, the other ends of the plurality of tie rods 72 each penetrate the machine platform 1 and are fixedly connected to the fixed end of the lifting drive mechanism 3.

[0029] Furthermore, the cold sintering heating mechanism 2 is a cylindrical air heater. When the lifting drive mechanism 3 drives the lower die set 4 to rise, the upper die set 6, the forming die 5 and the lower die set 4 are sequentially extended into the inner cavity of the cylindrical air heater for heating. After the cold sintering process is completed, the lifting drive mechanism 3 drives the lower die set 4 to descend and reset, so that the upper die set 6 and the forming die 5 can be transferred and the cold sintered finished product can be taken out, avoiding the need for traditional molds to be cooled before being dismantled to take out the finished product, which is conducive to ensuring uniform heating of the cold sintering material and at the same time meeting the requirements of convenient loading and unloading between the upper die set 6, the forming die 5 and the lower die set 4 and easy removal of the cold sintered finished product.

[0030] Further, the lifting drive mechanism 3 includes a first connecting rod 31 fixedly connected to the bottom of the machine 1, a first flange seat 32 connected to the first connecting rod 31, a reduction motor 33 connected to the first flange seat 32, a screw rod 34 penetrating the first flange seat 32 and connected to the output end of the reduction motor 33, a guide cylinder 35 fixedly connected to the first flange seat 32, and a transmission nut 36 slidably and lifted in the guide cylinder 35 and threadedly matched with the screw rod 34, and the top of the transmission nut 36 is fixedly connected to the lower die 4. With the above technical solution, the lifting drive mechanism 3 drives the lower die 4 to rise and fall, and can effectively control the pressure between the upper die 6 and the lower die 4 and maintain a constant pressure. Further, the inner side wall of the guide cylinder 35 is provided with a guide slot 13, and the outer side wall of the transmission nut 36 is fixedly connected with a lifting slider 14 slidably matched with the guide slot 13, so as to realize that the transmission nut 36 is slidably and lifted in the guide cylinder 35. In other embodiments, another feasible implementation of the lifting drive mechanism 3 is: the lifting drive mechanism 3 includes a second connecting rod (not shown in the figure) fixedly connected to the bottom of the machine platform 1, a second flange seat (not shown in the figure) connected to the second connecting rod, and a hydraulic cylinder (not shown in the figure) connected to the second flange seat, and the output end of the hydraulic cylinder is fixedly connected to the lower mold group 4, which can also drive the lower mold group 4 to rise and fall and maintain a constant pressure.

[0031] Furthermore, a force measuring fixed seat 15 is clamped between the output end of the lifting drive mechanism 3 and the lower mold group 4. The force measuring fixed seat 15 accommodates a force sensor 16 that abuts against the bottom of the lower mold group 4. The force sensor 16 is used to measure the pressure exerted on the lower mold group 4 when the top surface of the upper mold 6 presses against the supporting top pressure frame 7.

[0032] Furthermore, the lower die assembly 4 also includes a sintering die 43 sandwiched between the pressure head 41 and the lower die base 42 , and a probe plug hole 17 is opened on the side wall of the sintering die 43 , and a temperature probe 19 for measuring the temperature of the sintering die 43 is inserted into the probe plug hole 17 .

[0033] Furthermore, a probe clearance through hole 18 for accommodating a temperature probe 19 is provided on the bottom side wall of the cold sintering heating mechanism 2 .

[0034] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A cold sintering production equipment, characterized in that: The invention comprises a machine platform, a lifting drive mechanism fixedly connected to the bottom of the machine platform, a lower die group connected to the output end of the lifting drive mechanism, a forming die detachably arranged on the top of the lower die group, an upper pressing die detachably inserted on the top of the forming die, a supporting top pressing frame fixedly connected to the fixed end of the lifting drive mechanism or the top of the machine platform, and a cold sintering heating mechanism fixedly connected to the supporting top pressing frame and located above the upper pressing die. The machine platform is provided with a lower die making way through hole for making way for the lower die group. The upper pressing die and the lower die group cooperate to compress the cold sintering material. The lifting drive mechanism is used to drive the lower die group to lift and lower. When the lifting drive mechanism drives the lower die group to rise, the upper pressing die, the forming die and the lower die group extend into the cold sintering heating mechanism in sequence, and the top surface of the upper pressing die presses against the supporting top pressing frame.

2. A cold sintering production equipment according to claim 1, characterized in that: The forming die is provided with at least one feed through hole, and a pressing cavity for accommodating cold sintering material is formed between the feed through hole and the lower die set; a pressing block is extended from the bottom of the upper die and extends into the feed through hole and is used to cooperate with the lower die set to press the cold sintering material, and the number of the pressing blocks corresponds to the number of the feed through holes.

3. A cold sintering production equipment according to claim 2, characterized in that: The top of the forming die is provided with an expansion opening communicated with the feed through hole, and the pressing block extends into the feed through hole along the expansion opening.

4. The cold sintering production equipment according to claim 1, characterized in that: The supporting top pressing frame includes a top pressing plate and a plurality of pull rods each having one end fixedly connected to the top pressing plate, the other ends of the plurality of pull rods each being fixedly connected to the fixed end of the lifting drive mechanism or the top of the machine platform, the cold sintering heating mechanism being fixedly connected to the bottom of the top pressing plate and being located directly above the upper die, and the top pressing plate being used for limiting and pressing the upper die.

5. The cold sintering production equipment according to claim 1, characterized in that: The cold sintering heating mechanism is a cylindrical air heater.

6. The cold sintering production equipment according to claim 1, characterized in that: The lifting drive mechanism includes a first connecting rod fixedly connected to the bottom of the machine platform, a first flange seat connected to the first connecting rod, a reduction motor connected to the first flange seat, a screw rod penetrating the first flange seat and connected to the output end of the reduction motor, a guide cylinder fixedly connected to the first flange seat, and a transmission nut that is slidably and lifted in the guide cylinder and cooperates with the screw rod thread, and the top of the transmission nut is fixedly connected to the lower mold assembly.

7. The cold sintering production equipment according to claim 1, characterized in that: The lifting drive mechanism includes a second connecting rod fixedly connected to the bottom of the machine platform, a second flange seat connected to the second connecting rod, and a hydraulic cylinder connected to the second flange seat, and the output end of the hydraulic cylinder is fixedly connected to the lower mold assembly.

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