Ceramic boat corner dry pressing forming die

Abstract

The utility model relates to a ceramic boat corner dry pressing forming die which comprises an upper punching main body, a middle die main body and a lower punching main body which are sequentially arranged from top to bottom, an assembling cavity is formed in the middle of the middle die main body, tungsten steel is embedded in the upper portion of the assembling cavity, Cr12Mov die steel is embedded in the lower portion of the assembling cavity, and the lower portion of the assembling cavity is provided with a lower punching main body. The tungsten steel and the Cr12Mov die steel are provided with vertically-through powder filling cavities, and the upper punch body and the lower punch body are matched with the upper end and the lower end of the powder filling cavities. The ceramic boat corner dry pressing forming die does not depend on a release agent, and can produce green bodies with high precision and good density uniformity.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic forming dies, in particular to a ceramic boat corner dry pressing forming die. Background Art

[0002] Currently, plasma-enhanced chemical vapor deposition (PECVD) is commonly used to coat solar silicon wafers. Graphite boats are often used as carriers for the coating process. During use, graphite boats typically require boat corners as supports, primarily for insulation and support. Graphite boat corners are commonly used in existing technologies. Because graphite is soft and conductive, it is particularly susceptible to damage during use. Ceramic boat corners offer a superior alternative to graphite boat corners in terms of strength, wear resistance, corrosion resistance, insulation, and breakdown resistance, and they also offer a longer lifespan. However, ceramic boat corners are difficult and expensive to process due to their hardness. Dry pressing is commonly used to process ceramic boat corners. Existing pressing molds are typically made of mold steel, which lacks toughness. Deep mold cavities are required for boat corner production. During pressing and demolding, significant friction between the molds leads to uneven pressing density, prone to chipping and cracking of the green body. After sintering, the green body has significant dimensional fluctuations, requiring a large excess margin. The dimensional accuracy of the finished product relies on post-processing, and a release agent must be added during the process. Utility Model Content

[0003] In order to overcome the technical defects of the prior art, the utility model provides a ceramic boat corner dry pressing mold, which does not rely on a release agent and can produce green bodies with high precision and good density uniformity.

[0004] The technical solution adopted by the present invention is: a ceramic boat angle dry pressing forming mold, comprising an upper punch body, a middle mold body and a lower punch body arranged in sequence from top to bottom, an assembly cavity is opened in the middle of the middle mold body, the upper part of the assembly cavity is inlaid with tungsten steel, and the lower part of the assembly cavity is inlaid with Cr12Mov mold steel, and a powder filling cavity that passes through from top to bottom is opened on the tungsten steel and Cr12Mov mold steel, and the upper punch body and the lower punch body cooperate with the upper and lower ends of the powder filling cavity.

[0005] Preferably, the upper end of the upper punch body is connected to an upper punch fixing plate, and the lower end of the lower punch body is connected to a lower punch fixing plate.

[0006] Preferably, the cross-section of the assembly cavity is square, and the outer edge shape of the cross-section of the tungsten steel and Cr12Mov mold steel is a square that matches the assembly cavity.

[0007] Preferably, the lower end of the upper punch body and the upper end of the lower punch body are provided with chamfered structures.

[0008] Preferably, the upper section of the lower punch body is a lower punch inlaid tungsten steel inlaid on the lower punch body, and the cross-sectional size of the lower punch inlaid tungsten steel is larger than the cross-sectional size of the lower punch body.

[0009] Preferably, a waist-shaped clamping hole is provided in the middle of the middle mold body.

[0010] The beneficial effects of the utility model are as follows: the ceramic boat corner dry pressing forming mold of the utility model is suitable for the pressing operation of the ceramic boat corner green body, the green body has high dimensional accuracy and good density uniformity, and the difficulty of later ceramic processing is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of the dry-pressing die for ceramic boat corners of the present invention.

[0012] Figure 2 It is a structural diagram of the middle mold body of the utility model.

[0013] Figure 3 It is a top view of the middle mold body of the present utility model.

[0014] Figure 4 These are the bottom view and the front view of the upper punch body of the utility model.

[0015] Figure 5 These are the top view and the front view of the lower punch body of the utility model.

[0016] Explanation of the accompanying symbols: 1. Upper punch body; 101. Upper punch fixing plate; 2. Middle die body; 201. Assembly cavity; 202. Tungsten steel; 203. Cr12Mov mold steel; 204. Powder filling cavity; 205. Waist-shaped locking hole; 3. Lower punch body; 301. Lower punch fixing plate; 302. Lower punch inlaid with tungsten steel; 4. Chamfer structure. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] like Figures 1 to 5As shown, this embodiment provides a ceramic boat angle dry pressing forming mold, including an upper punch body 1, a middle mold body 2 and a lower punch body 3 arranged in sequence from top to bottom, an assembly cavity 201 is opened in the middle of the middle mold body 2, the upper part of the assembly cavity 201 is inlaid with tungsten steel 202, and the lower part of the assembly cavity 201 is inlaid with Cr12Mov mold steel 203, and the tungsten steel 202 and the Cr12Mov mold steel 203 are opened with a powder filling cavity 204 that passes through from top to bottom, the upper punch body 1 and the lower punch body 3 are matched with the upper and lower ends of the powder filling cavity 204, and the assembly cavity 201 in the middle mold body 2 of this embodiment is provided with tungsten steel 202 and Cr12Mov mold steel 203. When performing the pressing and forming operation, the green body is formed in the segmented powder filling cavity 204 of the tungsten steel 202. The tungsten steel 202 has high strength and good toughness, which can effectively reduce the friction during the pressing and demolding of the green body, and can produce green bodies with uniform density, smooth surface and stable dimensional fluctuation without the aid of a release agent.

[0019] In this embodiment, the cross section of the assembly cavity 201 is square, and the outer edge shape of the cross section of the tungsten steel 202 and the Cr12Mov mold steel 203 is square to match the assembly cavity 201, which can reduce material costs.

[0020] When the ceramic boat angle dry pressing forming mold of this embodiment is in operation, the upper punch body 1 and the upper punch fixing plate 101 are connected using hexagonal countersunk screws, the lower punch body 3 and the lower punch fixing plate 301 are connected using hexagonal countersunk screws, and the upper fixing plate and the lower fixing plate are fixed to the press using hexagonal countersunk screws.

[0021] The operation process of the ceramic boat corner dry pressing mold is as follows:

[0022] 1. Set pressing parameters and powder filling height according to product requirements;

[0023] 2. The middle mold body 2 moves upward to the powder filling height, and the powder is evenly filled into the powder filling cavity 204;

[0024] 3. Pre-press the upper punch body 1 once. At this time, the pressure only needs to be set within 50% of the pressing pressure;

[0025] 4. The middle mold body 2 floats downward, and the product in the mold cavity moves upward relative to the middle mold body 2, about 30 mm away from the top plane of the middle mold body 2;

[0026] 5. Pressurize the upper punch body 1 and the lower punch body 3 to 100% at the same time. After reaching the set pressure, maintain the pressure for 5 to 10 seconds to compact the green body.

[0027] 6. The upper punch body 1 is lifted, and the middle die body 2 moves downward to the bottom, ejecting the green body and completing the pressing.

[0028] Since the length of the lower punch body 3 is relatively long, during the pressing process, a part of the lower punch body 3 is always in cooperation with the powder filling cavity 204 of the middle mold body 2. This part has large friction during the molding process and is prone to powder jamming. Therefore, the upper section of the lower punch body 3 of this embodiment is a lower punch inlaid tungsten steel 302 inlaid on the lower punch body 3. The cross-sectional size of the lower punch inlaid tungsten steel 302 is larger than the cross-sectional size of the lower punch body 3. During operation, the lower punch inlaid tungsten steel 302 remains in the powder filling cavity 204.

[0029] The locking hole of a traditional middle mold is usually flush with the upper end of the middle mold. When the gap between the lower mold and the middle mold is shorter, the mold cannot be assembled. In this embodiment, a waist-shaped locking hole 205 is provided in the middle section of the middle mold body 2, and the waist-shaped locking hole 205 is set slightly upward, which can reduce the overall stroke height. At the same time, the waist-shaped locking hole 205 can effectively avoid the problem of incorrect locking.

[0030] In this embodiment, the lower end of the upper punch body 1 and the upper end of the lower punch body 3 are provided with a chamfer structure 4, which can press out the chamfer and reduce the difficulty of porcelain processing.

[0031] The above shows and describes the basic principles and main features of the invention and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the utility model. Without departing from the spirit and scope of the invention, the utility model will have various changes and improvements, and these changes and improvements will fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. Ceramic boat corner dry pressing mold, characterized by: It includes an upper punch body, a middle die body and a lower punch body arranged in sequence from top to bottom. An assembly cavity is opened in the middle of the middle die body. The upper part of the assembly cavity is inlaid with tungsten steel, and the lower part of the assembly cavity is inlaid with Cr12Mov mold steel. A powder filling cavity that passes through from top to bottom is opened on the tungsten steel and Cr12Mov mold steel. The upper punch body and the lower punch body cooperate with the upper and lower ends of the powder filling cavity.

2. The ceramic boat corner dry pressing mold according to claim 1, characterized in that: The upper end of the upper punch body is connected to the upper punch fixing plate, and the lower end of the lower punch body is connected to the lower punch fixing plate.

3. The ceramic boat corner dry pressing mold according to claim 1, characterized in that: The cross section of the assembly cavity is square, and the outer edge shape of the cross section of the tungsten steel and Cr12Mov mold steel is a square that matches the assembly cavity.

4. The ceramic boat corner dry pressing mold according to claim 1, characterized in that: The lower end of the upper punch body and the upper end of the lower punch body are provided with chamfer structures.

5. The ceramic boat corner dry pressing mold according to claim 1, characterized in that: The upper section of the lower punch body is a lower punch inlaid tungsten steel inlaid on the lower punch body, and the cross-sectional size of the lower punch inlaid tungsten steel is larger than the cross-sectional size of the lower punch body.

6. The ceramic boat corner dry pressing mold according to claim 1, characterized in that: A waist-shaped clamping hole is provided in the middle of the middle mold body.

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