Double-sided sintered body forming jig, sintering method and heat exchanger

Abstract

The invention relates to the technical field of dilution refrigeration equipment, and provides a double-sided sintered body forming jig which comprises a clamp body provided with a feeding cavity penetrating through the top face and the bottom face of the clamp body. Comprising two half die bodies, when the two half die bodies are configured to be in a butt joint state, a substrate can be fixed in the feeding cavity in a horizontal posture; the two pressurizing blocks can be movably sleeved in the feeding cavity from the upper side and the lower side of the clamp body respectively; the two scraping grooves are formed in the two sides of the base plate; and after the base plate is filled with powder from the feeding cavity, the powder higher than the scraping groove is scraped, and a powder layer with the uniform thickness is formed on the base plate. Therefore, the base plate is fixed in the feeding cavity in the horizontal posture, the scraping grooves are formed in the two sides of the base plate, redundant powder is scraped away in cooperation with the scraping plates, and therefore powder layers with the uniform thickness can be formed on the two sides of the base plate. After sintering, sintered bodies are simultaneously formed on both sides of the substrate. The invention further provides a sintering method and a heat exchanger.

Description

Technical Field

[0001] The invention belongs to the technical field of dilution refrigeration equipment, and in particular relates to a double-sided sintered body forming jig, a sintering method and a heat exchanger. Background Art

[0002] When the fluid inside the ultra-low temperature equipment is under ultra-low temperature conditions, the thermal resistance between the liquid and the solid surface becomes very large. Therefore, the heat exchanger needs to have a large heat exchange area and good heat exchange performance. Therefore, it is necessary to sinter a silver powder block with a certain thickness on both sides of the heat exchange baffle in the heat exchanger.

[0003] To ensure the heat exchange effect, the thickness of the block after sintering is relatively large. Therefore, a certain thickness of silver powder layer needs to be laid on both sides of the substrate before sintering. And in order to make the thickness of the block after sintering uniform, the thickness of the silver powder laid should be consistent. However, at present, there is a lack of dedicated fixtures, which makes it difficult to form sintered blocks on the upper and lower surfaces of the substrate.

[0004] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0005] In view of the above-mentioned defects, the present invention mainly provides a double-sided sintered body forming jig to solve the technical problem of simultaneously forming a sintered body with uniform thickness on the upper and lower surfaces of a substrate.

[0006] In order to solve the above problems, the present invention provides a double-sided sintered body forming jig, comprising:

[0007] The clamp body is provided with a feeding cavity penetrating the top and bottom surfaces thereof; the clamp body comprises two detachable butt-jointed half mold bodies;

[0008] The two halves of the mold body are configured such that when they are in a docking state, the substrate can be fixed in the feeding cavity in a horizontal posture;

[0009] Two pressure blocks can be movably inserted into the feeding cavity from the upper and lower sides of the clamp body respectively; the pressure blocks are also fixedly connected to a pressure plate;

[0010] Two scraper grooves are respectively arranged on the upper and lower sides of the base plate; the scraper grooves pass through the feeding cavity and two side surfaces of the clamping body in the horizontal direction;

[0011] The scraper can enter from one side of the scraper trough and pass through from the other side; the scraper is configured to: after the powder is filled from the feeding chamber onto the substrate, scrape off the powder that is higher than the scraper trough to form a powder layer of uniform thickness on the substrate.

[0012] According to the double-sided sintered body forming jig of the present invention, the two half mold bodies are horizontally parted, each half mold body is provided with a half material cavity, and the two half mold bodies are butted together so that the two half material cavities are combined to form the feeding cavity.

[0013] According to the double-sided sintered body forming jig of the present invention, a plate fixing groove for plugging and cooperating with the edge of the substrate is provided on the inner wall of the half mold body.

[0014] According to the double-sided sintered body forming jig of the present invention, two groups of scraping grooves symmetrically arranged on both sides of the fixing plate groove are opened on the inner wall of the half mold body.

[0015] According to the double-sided sintered body forming jig of the present invention, a clearance groove is formed at the butt joint of the two half mold bodies; and a handle that can move through the clearance groove is fixedly connected to the scraper.

[0016] According to the double-sided sintered body forming jig of the present invention, a heating hole for placing a heating rod is provided on the pressure block.

[0017] A sintering method based on the double-sided sintered body forming jig described in item 1 comprises the following steps:

[0018] S1, fix the base plate in the clamp body, and fix the two halves of the clamp body by bolts;

[0019] S2, the clamp body is placed horizontally, and the powder is filled into the feeding cavity with the opening facing upward;

[0020] S3, using a scraper to penetrate from one side of the scraper trough and pass out from the other side to scrape off excess powder to form a powder layer on the substrate;

[0021] S4, placing a pressure block into the feeding chamber, with the end surface of the pressure block attached to the powder layer, so that the powder layer is shaped in the feeding chamber;

[0022] S5, turning the pressure block and the clamp body 180° as a whole; repeating steps S2-S4;

[0023] S6, fix the two pressure plates and the clamp body with bolts;

[0024] S7, sending the entire jig into a sintering device for sintering to form a sintered body on both sides of the substrate at the same time.

[0025] A heat exchanger comprises a substrate, both sides of the substrate are provided with sintered bodies formed by the sintering method.

[0026] According to the heat exchanger of the present invention, the material of the sintered body is silver powder.

[0027] According to the heat exchanger of the present invention, the thickness of the substrate does not exceed 1 mm, and the thickness of the sintered body is not less than 3 mm.

[0028] In summary, the double-sided sintered body forming jig of the present invention fixes the substrate in the feeding chamber in a horizontal posture, and provides scraping grooves on both sides thereof, and scrapes off excess powder with a scraper, so that a powder layer with uniform thickness can be formed on both sides of the substrate. After sintering, a sintered body is formed on both sides of the substrate at the same time. The forming jig of the present invention has a simple structure, convenient operation, accurate powder layer thickness, and avoids waste of raw materials. The present invention also provides a sintering method and a heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of a double-sided sintered body forming jig of the present invention;

[0030] Figure 2 yes Figure 1 A schematic diagram of a cross-sectional structure of a fixture in FIG.

[0031] Figure 3 It is a schematic diagram of the exploded structure of the clamp body of the present invention;

[0032] Figure 4 2. It is a schematic diagram of the scraping principle of the clamp body of the present invention;

[0033] Figure 5 yes Figure 4 A schematic cross-sectional structure diagram of ;

[0034] Figure 6 It is a schematic structural diagram of a heat exchanger of the present invention;

[0035] In the figure: 1-clamping body, 11-half mold body, 12-scraper groove, 13-allowing groove, 14-fixing plate groove, 15-scraper, 151-handle; 16-feeding cavity; 2-pressure plate, 21-pressure block, 22-heating hole; 3-base plate, 31-powder, 32-sintered body. DETAILED DESCRIPTION

[0036] See also Figure 1 and Figure 2 The present invention provides a double-sided sintered body forming jig, comprising:

[0037] Combination Figure 4 The clamp body 1 is provided with a feeding cavity 16 which passes through the top and bottom surfaces thereof; Figure 3 , the clamp body 1 comprises two detachably connected half-mold bodies 11;

[0038] The two half mold bodies 11 are configured such that: when the two are in a docking state, the substrate 3 can be fixed in the feeding cavity 16 in a horizontal posture; when the two are in a disassembled state, the substrate 3 can be taken out;

[0039] Two pressure blocks 21 can be movably inserted into the feeding chamber 16 from the upper and lower sides of the clamp body 1 respectively; the pressure blocks 21 are also fixedly connected to a pressure plate 2;

[0040] After the substrate 3 is fixed in the feeding chamber 16 , the powder 31 can be filled through the upper opening of the feeding chamber 16 to form a powder layer to be sintered on the substrate 3 .

[0041] Two scraper grooves 12 are respectively arranged on the upper and lower sides of the base plate 3; the scraper grooves 12 pass through the feeding cavity 16 and the two side surfaces of the clamp body 1 in the horizontal direction;

[0042] Combination Figure 5 The scraper 15 can enter from one side of the scraper groove 12 and pass through the other side; it is used to scrape off the powder 31 that is higher than the scraper groove 12 to form a powder layer with uniform thickness on the substrate 3. Figure 6 After sintering, a sintered body 32 with uniform thickness is formed on the substrate 3.

[0043] Those skilled in the art can first form a powder layer with uniform thickness on one side of the substrate 3, press the pressure block 21 in to fix the powder layer, and then flip the whole body to form a powder layer with uniform thickness on the other side of the substrate 3. Then, the whole body is sintered to form sintered bodies 32 on both sides of the substrate 3 at the same time.

[0044] The double-sided sintered body forming jig of the present invention fixes the substrate 3 in the feeding chamber 16 in a horizontal posture, and provides scraper grooves 12 on both sides thereof, and scrapes off excess powder 31 with a scraper 15, so that a powder layer with uniform thickness can be formed on both sides of the substrate 3. After sintering, sintered bodies 32 are simultaneously formed on both sides of the substrate 3. The forming jig of the present invention has a simple structure, convenient operation, accurate powder layer thickness, and avoids waste of raw materials.

[0045] As an embodiment, the two halves of the mold body 11 are horizontally split, and each half of the mold body 11 is provided with a half material cavity. After the two halves of the mold body 11 are butt-jointed, the two halves of the material cavity are combined to form the feeding cavity 16;

[0046] As an embodiment, a fixing plate groove 14 for plugging and cooperating with the substrate 3 is opened on the inner wall of the half mold body 11; when the two half mold bodies 11 are in a docking state, the fixing plate groove 14 wraps around the periphery of the substrate 3, and the substrate 3 is plugged into the fixing plate groove 14, thereby fixing the substrate 3 in the feeding cavity 16.

[0047] As an implementation mode, two groups of scraping grooves 12 symmetrically arranged on both sides of the fixing plate groove 14 are opened on the inner wall of the half mold body 11; and powder layers with the same thickness are formed on both sides of the base plate 3.

[0048] Furthermore, a clearance groove 13 is formed at the joint position of the two half mold bodies 11; after the scraper 15 is inserted into the scraper groove 12, the clamp body 1 can be tilted to pour out the excess powder 31 from the scraper groove 12;

[0049] As an implementation, a handle 151 is fixedly connected to the scraper 15; the handle 151 can pass through the clearance groove 13 to facilitate the scraping operation of the operator.

[0050] As an implementation, the pressure block 21 is provided with a heating hole 22 for placing a heating rod; after the jig is assembled, the temperature of the pressure block 21 can be raised by the heating rod to provide sintering heat. The pressure block 21 is directly close to the powder 31 for sintering, the temperature is precisely controllable, and energy consumption is saved.

[0051] The present invention also provides a sintering method based on the double-sided sintered body forming jig, comprising the following steps:

[0052] S1, fix the substrate 3 in the clamp body 1, and fix the two half mold bodies 11 of the clamp body 1 by bolts;

[0053] S2, the clamp body 1 is placed horizontally, and the powder 31 is filled into the feeding cavity 16 with the opening facing upward;

[0054] S3, using the scraper 15 to penetrate from one side of the scraper trough 12 and pass out from the other side to scrape off the excess powder 31, forming a powder layer on the substrate 3;

[0055] S4, placing the pressure block 21 into the feeding chamber 16, with the end surface of the pressure block 21 attached to the powder layer, so that the powder layer is formed in the feeding chamber 16;

[0056] Optionally, the present invention further provides a cushion block, and after the pressure block 21 is placed in the feeding chamber 16, the cushion block is placed between the pressure plate 2 of the pressure block 21 and the clamp body 1 to prevent the pressure block 21 from pressing on the powder layer and causing deformation of the substrate 3.

[0057] S5, turning the pressure block 21 and the clamp body 1 over by 180°; repeating steps S2-S4;

[0058] S6, fix the two pressure plates 2 and the clamp body 1 with bolts;

[0059] Optionally, the present invention can tighten the bolts so that the two pressure blocks 21 generate pre-tightening forces of the same magnitude and opposite directions on the powder layer. At this time, the forces on both sides of the base plate 3 are the same, and the pads can be removed.

[0060] S7, sending the entire jig into a sintering device for sintering to form a sintered body 32 on both sides of the substrate at the same time;

[0061] See also Figure 6, the present invention also provides a heat exchanger, comprising a substrate 3, both sides of the substrate 3 have a sintered body 32 formed by the sintering method;

[0062] More preferably, the material of the sintered body 32 is silver powder, which has good thermal conductivity.

[0063] The thickness of the substrate 3 of the heat exchanger of the present invention does not exceed 1 mm, preferably 0.5 mm; the thickness of the sintered body 32 is not less than 3 mm, preferably 3-5 mm. The sintered body 32 has a large heat conduction area and a small thermal resistance, so that the heat exchanger has a good heat exchange performance.

[0064] In summary, the present invention provides a double-sided sintered body forming jig, which fixes the substrate in a horizontal position in the feeding chamber, and provides scraper grooves on both sides thereof, and scrapes off excess powder with a scraper, so that a powder layer with uniform thickness can be formed on both sides of the substrate. After sintering, a sintered body is formed on both sides of the substrate at the same time. The forming jig of the present invention has a simple structure, is easy to operate, has a precise powder layer thickness, and avoids waste of raw materials. The present invention also provides a sintering method and a heat exchanger.

[0065] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A double-sided sintered body forming jig, characterized in that: include: The clamp body is provided with a feeding cavity penetrating the top and bottom surfaces thereof; the clamp body comprises two detachable butt-jointed half mold bodies; The two halves of the mold body are configured such that when they are in a docking state, the substrate can be fixed in the feeding cavity in a horizontal posture; Two pressure blocks can be movably inserted into the feeding cavity from the upper and lower sides of the clamp body respectively; the pressure blocks are also fixedly connected to a pressure plate; Two scraper grooves are respectively arranged on the upper and lower sides of the base plate; the scraper grooves pass through the feeding cavity and two side surfaces of the clamping body in the horizontal direction; The scraper can enter from one side of the scraper trough and pass through from the other side; the scraper is configured to: after the powder is filled from the feeding chamber onto the substrate, scrape off the powder that is higher than the scraper trough to form a powder layer of uniform thickness on the substrate.

2. The double-sided sintered body forming jig according to claim 1, characterized in that: The two half mold bodies are horizontally divided, and each half mold body is provided with a half material cavity. The two half mold bodies are butted together so that the two half material cavities are combined to form the feeding cavity.

3. The double-sided sintered body forming jig according to claim 1, characterized in that: The inner wall of the half mold body is provided with a plate fixing groove for plugging and matching with the edge of the base plate.

4. The double-sided sintered body forming jig according to claim 3, characterized in that: Two groups of scraping grooves symmetrically arranged on both sides of the fixing plate groove are opened on the inner wall of the half mold body.

5. The double-sided sintered body forming jig according to claim 1, characterized in that: A clearance groove is formed at the butt joint of the two half mold bodies; a handle which can movably pass through the clearance groove is fixedly connected to the scraper.

6. The double-sided sintered body forming jig according to claim 1, characterized in that: The pressure block is provided with a heating hole for placing a heating rod.

7. A sintering method based on the double-sided sintered body forming jig according to any one of claims 1 to 6, characterized in that: The steps include: S1, fix the base plate in the clamp body, and fix the two halves of the clamp body by bolts; S2, the clamp body is placed horizontally, and the powder is filled into the feeding cavity with the opening facing upward; S3, using a scraper to penetrate from one side of the scraper trough and pass out from the other side to scrape off excess powder to form a powder layer on the substrate; S4, placing a pressure block into the feeding cavity, with the end surface of the pressure block attached to the powder layer, so that the powder layer is shaped in the feeding cavity; S5, turning the pressure block and the clamp body 180° as a whole; repeating steps S2-S4; S6, fix the two pressure plates and the clamp body with bolts; S7, the jig is sent as a whole into a sintering device for sintering, and a sintered body is formed on both sides of the substrate at the same time.

8. A heat exchanger, characterized in that: The invention comprises a substrate having a sintered body formed by the sintering method according to claim 7 on both sides of the substrate.

9. The heat exchanger according to claim 8, characterized in that The material of the sintered body is silver powder.

10. The heat exchanger according to claim 8, characterized in that The thickness of the substrate does not exceed 1 mm, and the thickness of the sintered body is not less than 3 mm.

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