Casting box and casting machine

Abstract

The utility model discloses a tape casting box and a tape casting machine, relates to the technical field of ceramic substrate production, is used for tape casting production of ceramic substrates, the tape casting box is provided with a bottom wall, the tape casting box is provided with a tape casting cavity and a tape casting opening communicated with the tape casting cavity, the tape casting opening penetrates through the bottom wall and is used for allowing slurry in the tape casting cavity to flow to a carrier membrane, and the carrier membrane is provided with a carrier membrane. A receding groove is further formed in the face, back on to the casting cavity, of the bottom wall, communicates with the casting opening and is used for receding the bearing film. According to the technical scheme provided by the utility model, the contact friction between the casting box and the PET mold tape is avoided, so that the surface of a green tape is prevented from being scratched.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic substrate production, in particular to a casting box and a casting machine. Background Art

[0002] Ceramic substrates are widely used in high-power power semiconductor modules, power control circuits, automotive electronics, aerospace and military fields because their heat dissipation performance, current carrying capacity, insulation, thermal expansion coefficient, etc. are much better than ordinary glass fiber PCB boards.

[0003] At present, the general production process of ceramic substrates is powder slurrying → tape casting → stamping → powder coating → sintering → sand removal, cleaning and drying → correction and leveling. In the tape casting production process, the main purpose is to pass the liquid slurry made of powder through the tape casting machine to obtain a ceramic green tape with a certain uniform thickness. A PET film tape coated with silicone oil will be used in tape casting. The tape casting machine uses tension rollers at both ends to evenly tighten the tape and lay it flat in the machine window. The liquid slurry is spread flat on the surface of the film tape through the tape casting box and scraper. After drying, it forms a green ceramic tape. However, when the PET tape passes through the tape casting box, it will directly contact and rub with the bottom surface of the tape casting box, affecting the flatness of the tape surface, and then causing scratches on the green ceramic tape laid on the surface of the tape. Utility Model Content

[0004] The main purpose of the utility model is to provide a casting box and a casting machine, aiming to avoid contact and friction between the casting box and the PET mold belt, so as to avoid scratches on the surface of the green porcelain belt.

[0005] To achieve the above-mentioned purpose, the utility model proposes a casting box for casting production of ceramic substrates, the casting box having a bottom wall, the casting box being provided with a casting cavity and a casting port connected to the casting cavity, the casting port passing through the bottom wall, for allowing the slurry in the casting cavity to flow to the supporting film, the bottom wall being further provided with a avoidance groove on the side facing away from the casting cavity, the avoidance groove being connected to the casting port, and the avoidance groove being used to avoid the supporting film.

[0006] In one embodiment, the cross-sectional area of ​​the avoidance groove gradually decreases from an end away from the casting port to an end close to the casting port.

[0007] In one embodiment, the depth of the avoidance groove in a direction perpendicular to the plane where the bottom wall is located is defined as the groove depth of the avoidance groove, and the groove depth of the avoidance groove ranges from 0.05 mm to 0.5 mm.

[0008] In one embodiment, the casting box includes two spaced-apart mounting portions, a side wall and the bottom wall, the side wall and the bottom wall are connected at an angle and are connected to the two mounting portions, the side wall, the bottom wall and the two mounting portions enclose the casting cavity and the casting mouth, the avoidance groove is arranged through the side wall, and the side wall is provided with an inlet connected to the casting cavity.

[0009] In one embodiment, a casting plate is provided in the casting chamber, and the casting plate is connected to the two mounting portions and the bottom wall to separate the casting chamber into a first cavity and a second cavity, the inlet is connected to the first cavity, and the casting port is connected to the second cavity;

[0010] The slurry enters the first cavity from the inlet until it submerges the casting plate, and flows to the carrier film through the second cavity and the casting port.

[0011] In one embodiment, the cast plate includes a drainage section and a partition section, the partition section is connected to the bottom wall, the drainage section is connected to one end of the partition section away from the bottom wall, the partition section is arranged parallel to the side wall, and the drainage section is arranged at an angle to the partition section.

[0012] In one embodiment, the distance between the drainage section and the side wall gradually decreases from an end close to the partition section to an end away from the partition section;

[0013] And / or, the distance between the end surface of the drainage section away from one end of the partition section and the bottom wall is smaller than the distance between the end surface of the side wall away from one end of the bottom wall and the bottom wall.

[0014] In one embodiment, a scraper is provided in the second cavity, and the scraper is connected to the two mounting parts to separate the second cavity into a third cavity and a groove. The casting port is connected to the third cavity, and the groove and the first cavity are located on opposite sides of the third cavity.

[0015] In one embodiment, the mounting portion is provided with a mounting groove and a mounting hole on a side facing away from the casting chamber for mounting the casting box, one end of the mounting groove passes through the side of the mounting portion, and the mounting hole is provided on a side of the mounting groove close to the side wall.

[0016] The present invention also provides a casting machine, which includes the casting box as described above.

[0017] The technical solution of the utility model is to provide a avoidance groove on the bottom wall of the casting box, the supporting film moves through the bottom wall of the casting box, the casting port of the casting box is connected to the avoidance groove, the slurry flows from the casting port to the supporting film to form a green porcelain tape, and the provision of the avoidance groove avoids contact and friction between the bottom wall of the casting box and the PET supporting mold tape, thereby improving the flatness of the mold tape surface, and thus avoiding scratches on the green porcelain tape laid flat on the mold tape surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 This is a structural diagram of a casting box in an embodiment of the present invention;

[0020] Figure 2 A schematic structural diagram of a casting box from another perspective in one embodiment of the present invention;

[0021] Figure 3 This is a structural schematic diagram of a casting box from another perspective in an embodiment provided by the present invention.

[0022] Description of Figure Numbers:

[0023] 100. Casting box; 1. Bottom wall; 11. Casting port; 12. Avoidance groove; 2. Mounting portion; 21. Mounting groove; 22. Mounting hole; 3. Side wall; 31. Inlet; 4. Casting plate; 41. Partition section; 42. Drain section; 5. Scraper; 6. Casting chamber; 61. First cavity; 62. Second cavity; 621. Third cavity; 622. Groove.

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] Please refer to Figures 1 to 3 As shown, the utility model proposes a casting box 100 for casting ceramic substrates. The casting box 100 has a bottom wall 1. The casting box 100 is provided with a casting cavity 6 and a casting port 11 connected to the casting cavity 6. The casting port 11 passes through the bottom wall 1 and is used for allowing the slurry in the casting cavity 6 to flow to the supporting film. The side of the bottom wall 1 facing away from the casting cavity 6 is also provided with a avoidance groove 12. The avoidance groove 12 is connected to the casting port 11, and the avoidance groove 12 is used to avoid the supporting film.

[0029] In this embodiment, the bottom wall 1 of the casting box 100 faces the carrier film. When the ceramic substrate is produced by casting, the carrier film moves through the bottom wall 1 of the casting box 100, and the slurry flows from the casting port 11 to the carrier film and moves with the carrier film to form a raw ceramic sheet. The avoidance groove 12 is provided on the bottom wall 1 and is connected to the casting port 11 to avoid direct friction contact between the carrier film and the bottom wall 1 when the carrier film passes through the bottom wall 1 of the casting box 100, resulting in a reduction in the flatness of the carrier film, thereby preventing damage to the raw ceramic sheet laid flat on the carrier film.

[0030] In actual implementation, the extending direction of the avoidance groove 12 is consistent with the direction in which the carrying film passes through the bottom wall 1 .

[0031] In one embodiment of the present invention, Figure 2 and Figure 3 As shown, the cross-sectional area of ​​the avoidance groove 12 gradually decreases from the end away from the casting port 11 to the end close to the casting port 11 .

[0032] In this embodiment, the cross-sectional area of ​​the avoidance groove 12 gradually decreases toward one end of the casting mouth 11. While avoiding the supporting film, the slurry flowing from the casting mouth 11 to the avoidance groove 12 can be guided along the casting direction to improve the utilization rate of the slurry in the casting production.

[0033] In actual implementation, the casting direction of the ceramic substrate is consistent with the moving direction of the carrier film, and the extension direction of the avoidance groove 12 is consistent with the moving direction of the carrier film. When the slurry flows from the casting port 11 to the carrier film, it may flow against the moving direction of the carrier film to between the avoidance groove 12 and the carrier film. At this time, the avoidance groove 12 can continue to drain this part of the slurry in the moving direction of the carrier film.

[0034] In one embodiment of the present invention, Figure 2 and Figure 3 As shown, the depth of the avoidance groove 12 in a direction perpendicular to the plane where the bottom wall 1 is located is defined as the groove depth of the avoidance groove 12 , and the groove depth of the avoidance groove 12 ranges from 0.05 mm to 0.5 mm.

[0035] In this embodiment, if the groove depth of the avoidance groove 12 is too shallow, the possibility of accidental contact between the carrier film and the groove wall of the avoidance groove 12 will increase, resulting in reduced flatness of the carrier film. If the groove depth of the avoidance groove 12 is too deep, the slurry may flow out of the avoidance groove 12, resulting in waste of slurry.

[0036] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, the casting box 100 includes two installation parts 2, a side wall 3 and a bottom wall 1 arranged at intervals. The side wall 3 and the bottom wall 1 are connected at an angle and are connected to the two installation parts 2. The side wall 3, the bottom wall 1 and the two installation parts 2 enclose a casting cavity 6 and a casting mouth 11. The avoidance groove 12 is arranged through the side wall 3, and the side wall 3 is provided with an inlet 31 connected to the casting cavity 6.

[0037] In this embodiment, the casting box 100 is composed of two opposite mounting parts 2, a side wall 3 and a bottom wall 1. The two mounting parts 2 are used to install the casting box 100. The side wall 3 and the bottom wall 1 are connected to the two mounting parts 2 to enclose a casting cavity 6 and a casting port 11. The inlet 31 of the casting cavity 6 is arranged on the side wall 3 to allow the slurry to enter the casting cavity 6.

[0038] In actual implementation, the side walls 3, mounting portions 2, and bottom wall 1 are connected vertically in pairs. The two mounting portions 2 are located on either side of the avoidance groove 12. The casting port 11 is circularly arranged to facilitate communication with the transmission pipeline. The casting box 100 may also include a cover. The two mounting portions 2 and the ends of the side walls 3 facing away from the bottom wall 1 form an annular groove, and the cover can be restrained within the annular groove. The mounting portions 2 are also provided with recessed holes to reduce the overall weight of the casting box 100.

[0039] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, a casting plate 4 is provided in the casting chamber 6, and the casting plate 4 is connected to two mounting parts 2 and the bottom wall 1 to separate the casting chamber 6 into a first cavity 61 and a second cavity 62. The inlet 31 is connected to the first cavity 61, and the casting port 11 is connected to the second cavity 62; wherein, the slurry enters the first cavity 61 from the inlet 31 until it submerges the casting plate 4, and flows to the supporting film through the second cavity 62 and the casting port 11.

[0040] In this embodiment, the casting plate 4 is spaced apart from the side wall 3 and, together with the side wall 3 and the two mounting portions 2, forms a first cavity 61. The first cavity 61 is used to temporarily store the slurry. When the first cavity 61 is filled with slurry, the slurry submerges the casting plate 4, passes through the second cavity 62 and the casting port 11, and reaches the carrier film to achieve the casting effect. In actual implementation, the casting plate 4 is arranged parallel to the side wall 3. In actual implementation, the second cavity 62 is open at one end facing away from the casting plate 4, and the casting port 11 is located on the side of the casting plate 4 facing the second cavity 62.

[0041] In actual implementation, the angled connections between the inner walls of the first cavity 61 are all arc transitions, so that the slurry can gently fill the entire first cavity 61 .

[0042] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, the cast plate 4 includes a drainage section 42 and a partition section 41. The partition section 41 is connected to the bottom wall 1, and the drainage section 42 is connected to the end of the partition section 41 away from the bottom wall 1. The partition section 41 is arranged parallel to the side wall 3, and the drainage section 42 is arranged at an angle to the partition section 41.

[0043] In this embodiment, the casting plate 4 is composed of a drainage section 42 and a partition section 41. The partition section 41 is arranged close to the bottom wall 1. The partition section 41 divides the casting cavity 6 into a first cavity 61 and a second cavity 62. The drainage section 42 is connected to the end of the partition section 41 away from the bottom wall 1 and is inclined toward the direction of the first cavity 61. When the slurry submerges the casting plate 4, the drainage section 42 plays a certain buffering and drainage role on the slurry, preventing the slurry from falling directly from the top of the casting plate 4 to the carrying belt, so as to improve the production quality of the green porcelain tape.

[0044] In actual implementation, the drainage section 42 is tilted toward the first cavity 61, so as to buffer the slurry entering the first cavity 61 from the inlet 31 of the side wall 3, buffering the impact force of the slurry entering the first cavity 61, preventing the slurry from splashing over the cast plate 4, and allowing the slurry to fill the first cavity 61 more gently.

[0045] In one embodiment of the present invention, Figure 1 and Figure 2As shown, the distance between the drainage section 42 and the side wall 3 gradually decreases from the end close to the partition section 41 to the end away from the partition section 41; and / or, the distance between the end surface of the drainage section 42 away from the partition section 41 and the bottom wall 1 is smaller than the distance between the end surface of the side wall 3 away from the bottom wall 1 and the bottom wall 1.

[0046] In this embodiment, the drainage section 42 gradually slopes toward the first cavity 61 from the end connected to the partition 41 toward the end away from the partition 41. This allows the drainage section 42 to provide a buffering and drainage function while also reducing the volume of the first cavity 61, thereby improving casting efficiency. The end surface of the drainage section 42 is lower than the end surface of the side wall 3. Therefore, when the first cavity 61 is filled with slurry, the slurry only covers the drainage section 42 and flows along the drainage section 42.

[0047] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, a scraper 5 is provided in the second cavity 62, and the scraper 5 is connected to the two mounting parts 2 to separate the second cavity 62 into a third cavity 621 and a groove 622. The casting port 11 is connected to the third cavity 621, and the groove 622 and the first cavity 61 are located on opposite sides of the third cavity 621.

[0048] In this embodiment, the scraper 5 separates the second cavity 62 into a third cavity 621 and a groove 622. The first cavity 61, the third cavity 621 and the groove 622, the first cavity 61 and the third cavity 621 are connected through the end of the cast plate 4 away from the bottom wall 1, and the third cavity and the groove 622 are connected through the end of the scraper 5 close to the bottom wall 1. The scraper 5 is spaced apart from the carrier belt, and the bottom surface of the scraper 5 has a certain distance from the plane where the groove 622 is located, so as to scrape the slurry on the carrier belt to a specified thickness and produce raw porcelain sheets of specified thickness.

[0049] In actual implementation, the first cavity 61, the third cavity 621, and the groove 622 are arranged in sequence along the direction of movement of the carrier film. One end of the avoidance groove 12 passes through the side wall 3, and the other end of the avoidance groove 12 is connected to the groove 622. In this way, the avoidance groove 12 avoids the carrier film during the entire process of the carrier film passing through the casting box 100. The avoidance groove 12 extends from the side wall 3 to the groove 622, and the groove walls on both sides of the avoidance groove 12 are closed from the side wall 3 to the groove 622 to produce green porcelain sheets of a certain width. The connection between the inner wall of the third cavity 621 and the groove 622 is a circular arc transition to provide a buffer for the slurry. The end of the avoidance groove 12 is located within the groove 622, and the width of the end is consistent with the width of the groove 622 to produce green porcelain sheets of a certain width.

[0050] In one embodiment of the present invention, Figure 1 and Figure 2As shown, a mounting groove 21 and a mounting hole 22 are provided on the side of the mounting portion 2 facing away from the casting chamber 6 for mounting the casting box 100 . One end of the mounting groove 21 passes through the side of the mounting portion 2 , and the mounting hole 22 is provided on the side of the mounting groove 21 close to the side wall 3 .

[0051] In this embodiment, the corresponding mounting grooves 21 and mounting holes 22 of the casting machine are respectively provided with protrusions and fixing holes. When the casting box 100 is installed to the corresponding position of the casting machine, the protrusion can be inserted into the mounting groove 21 from the through end of the mounting groove 21 to realize the positioning of the casting box 100, and then the fixing part is passed through the fixing hole and the mounting hole 22 of the mounting part 2 to realize the fixed installation of the casting box 100.

[0052] In actual implementation, the mounting groove 21 can be configured as a dovetail groove or a common groove, and the protrusion of the casting machine corresponds to the shape of the groove 622, which is not specifically limited here.

[0053] The present invention also proposes a casting machine, which includes a casting box 100. The specific structure of the casting box 100 refers to the above embodiment. Since the present casting machine adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0054] The casting machine further includes a transmission device for transmitting the carrier film. The casting box 100 is arranged on a transmission channel of the transmission device so that the carrier film passes through the bottom wall 1 of the casting box 100 .

[0055] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A casting box for producing ceramic substrates by casting, characterized in that: The casting box has a bottom wall, and the casting box is provided with a casting cavity and a casting port connected to the casting cavity. The casting port passes through the bottom wall and is used for allowing the slurry in the casting cavity to flow to the supporting film. The side of the bottom wall facing away from the casting cavity is also provided with an avoidance groove, and the avoidance groove is connected to the casting port, and the avoidance groove is used to avoid the supporting film.

2. The casting box according to claim 1, characterized in that The cross-sectional area of ​​the avoidance groove gradually decreases from an end away from the casting port to an end close to the casting port.

3. The casting box according to claim 2, characterized in that The depth of the avoidance groove in a direction perpendicular to the plane where the bottom wall is located is defined as the groove depth of the avoidance groove, and the groove depth of the avoidance groove ranges from 0.05 mm to 0.5 mm.

4. The casting box according to claim 1, characterized in that The casting box includes two installation parts, a side wall and a bottom wall which are spaced apart from each other. The side wall and the bottom wall are connected at an angle and are connected to the two installation parts. The side wall, the bottom wall and the two installation parts enclose the casting cavity and the casting port. The avoidance groove runs through the side wall, and the side wall is provided with an inlet connected to the casting cavity.

5. The casting box according to claim 4, characterized in that A casting plate is provided in the casting chamber, and the casting plate is connected to the two mounting parts and the bottom wall to separate the casting chamber into a first cavity and a second cavity, the inlet is connected to the first cavity, and the casting port is connected to the second cavity; The slurry enters the first cavity from the inlet until it submerges the casting plate, and flows to the supporting film via the second cavity and the casting port.

6. The casting box according to claim 5, characterized in that The cast plate includes a drainage section and a partition section, the partition section is connected to the bottom wall, the drainage section is connected to one end of the partition section away from the bottom wall, the partition section is arranged parallel to the side wall, and the drainage section is arranged at an angle to the partition section.

7. The casting box according to claim 6, characterized in that The distance between the drainage section and the side wall gradually decreases from an end close to the partition section to an end far away from the partition section; And / or, the distance between the end surface of the drainage section away from one end of the partition section and the bottom wall is smaller than the distance between the end surface of the side wall away from one end of the bottom wall and the bottom wall.

8. The casting box according to claim 5, characterized in that A scraper is provided in the second cavity, and the scraper is connected to the two mounting parts to separate the second cavity into a third cavity and a groove. The casting port is connected to the third cavity, and the groove and the first cavity are located on opposite sides of the third cavity.

9. The casting box according to any one of claims 4 to 8, characterized in that The mounting portion is provided with a mounting groove and a mounting hole on a side facing away from the casting chamber for mounting the casting box. One end of the mounting groove passes through the side of the mounting portion, and the mounting hole is provided on one side of the mounting groove close to the side wall.

10. A tape casting machine, characterized in that: The casting machine comprises the casting box according to any one of claims 1 to 9.

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