Ceramic core mold capable of realizing negative pressure or vacuum exhaust

Abstract

The utility model discloses a ceramic core mold capable of realizing negative pressure or vacuum exhaust. The ceramic core mold comprises a template assembly, a mold assembly and a sealing assembly, the template assembly comprises an upper template and a lower template arranged below the upper template, and a gas collecting cavity is formed in the lower template; the die assembly comprises an upper die arranged on the lower bottom face of the upper die plate and a lower die arranged on the upper end face of the lower die plate. A first air exhaust hole is formed in the upper mold, and a second air exhaust hole is formed in the lower mold; a feeding channel is arranged at the joint of the upper mold and the lower mold; the die is reasonable in structural design, the production efficiency and quality of the ceramic core are effectively improved, and the development of the aerospace industry is promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic moulds, in particular to a ceramic core mould capable of achieving negative pressure or vacuum exhaust. Background Art

[0002] As the performance of engine blades has been greatly improved, higher requirements have been placed on all aspects of engine blades, especially on hollow blades. Most of the cavities of hollow blades need to be formed using ceramic cores, which are obtained by firing the green blanks at high temperatures (1100-1500°C) for a long time. Therefore, there are strict requirements on the surface roughness, smoothness, density and strength of the ceramic cores.

[0003] In the early days, the structure of ceramic core molds was generally multi-block and building block-type. Due to the backward application and promotion of 3D design software at that time, various processing methods were relatively backward. In order to obtain the required mold, the mold is usually designed with a lot of blocks according to the location of the ceramic core for processing. After processing, the product is pressed in a box with the blocks piled up. Such molds have a large number of blocks and a large cumulative error, resulting in poor mold precision and are very cumbersome to use. The pressed products are not consistent, unstable in shape, and inefficient. Moreover, in the production process of some multi-cavity circuits or relatively thick ceramic cores, there are often problems such as bubbles on the surface of the blank, welding marks, cavities inside the surface, airflow gaps inside the surface, and shrinkage in thick parts. The consequences of these problems are breakage after firing, cracking of the airflow gap position inside the surface, and peeling of the surface, resulting in low pass rate, high resource costs, and other practical problems, and even affecting the research and development cycle of the entire engine.

[0004] In recent years, molds have been greatly improved in terms of structure, use, and production. The structure of ceramic core molds is also diverse. In order to solve the above problems, the mold structure, exhaust, exhaust inserts, and even the use of software to simulate the manufacturing process are adjusted according to the simulation results. The gate position, size, and even exhaust grooves that the software considers unreasonable are adjusted. Although some problems can be solved to a certain extent and can basically meet the product requirements, the molds are manufactured under normal air pressure and cannot completely solve the problem from the root. Utility Model Content

[0005] In view of the above-mentioned technical problems, the utility model provides a ceramic core mold which can realize negative pressure or vacuum exhaust.

[0006] The technical scheme of the utility model is: a ceramic core mold capable of realizing negative pressure or vacuum exhaust, comprising a template assembly, a mold assembly arranged inside the template assembly, and a sealing assembly arranged between the template assembly and the mold assembly; the template assembly comprises an upper template and a lower template arranged below the upper template, a gas collecting cavity is arranged inside the lower template, and an air inlet pipe and an air return pipe communicated with the gas collecting cavity are arranged on the side wall of the lower template;

[0007] The mold assembly includes an upper mold which is arranged on the lower bottom surface of the upper mold and fixedly connected to the upper mold by locking screws, and a lower mold which is arranged on the upper end surface of the lower mold and fixedly connected to the lower mold by locking screws; a concave mold cavity is arranged on the lower bottom surface of the upper mold, and a punch mold cavity is arranged on the upper end surface of the lower mold; when the upper mold is close to the lower mold, the concave mold cavity and the punch mold cavity constitute a product cavity; a first exhaust hole located outside the concave mold cavity is penetrated through the upper mold, and a second exhaust hole located outside the punch mold cavity is penetrated through the lower mold; a feed channel connected to the product cavity is arranged at the connection between the upper mold and the lower mold.

[0008] Furthermore, the sealing assembly includes a first sealing ring arranged at the connection between the upper mold and the upper template, a second sealing ring arranged at the connection between the lower mold and the lower template, and a sealing strip arranged at the connection between the upper mold and the lower mold; the first sealing ring is located outside the first air extraction hole, the second sealing ring is located outside the second air extraction hole, and the sealing strip is located outside the product cavity;

[0009] Description: By setting sealing components between the upper template, the upper mold and the upper template, and the lower mold and the lower template, it is beneficial to improve the air tightness inside the product cavity when the mold is closed, thereby improving the molding effect and consistency of the product.

[0010] Furthermore, the upper end surface of the upper mold, the upper end surface of the lower mold and the lower bottom surface are all provided with a clamping groove; the first sealing ring is movably connected with the clamping groove of the upper end surface of the upper mold; the second sealing ring and the sealing strip are movably connected with the clamping grooves of the upper end surface and the lower bottom surface of the lower mold respectively;

[0011] Note: By setting the card groove, it is helpful to improve the tightness of the connection between the first sealing ring and the upper mold, the second sealing ring, the sealing strip and the lower mold, and avoid the displacement of the first sealing ring, the second sealing ring and the sealing strip during the mold assembly process.

[0012] Furthermore, positioning blocks are arranged at the four corners of the upper end surface of the lower mold, and positioning grooves corresponding to and slidingly engaging with the positioning blocks are arranged on the lower bottom surface of the upper mold;

[0013] Description: When the lower mold and the upper mold are closed, the clamping effect of the positioning block and the positioning groove is used to achieve accurate closing of the lower mold and the upper mold.

[0014] Furthermore, a guide column is arranged on the upper end surface of the lower mold, and a guide sleeve is arranged inside the upper mold to be slidably engaged with the guide column;

[0015] Note: By setting the guide column and guide sleeve, it is helpful to improve the stability of the upper mold and the lower mold during the mold closing process.

[0016] The working principle of the utility model is:

[0017] When in use, the upper template and the lower template are respectively fixed on the ceramic core equipment, and the equipment workbench is used to drive the upper mold close to the lower mold and press it tightly; then the external vacuum equipment is connected to the return air pipe to vacuum the product cavity. When the negative pressure value inside the product cavity reaches the set target value, the external vacuum equipment stops running and keeps the negative pressure value inside the product cavity constant; ceramic material is injected into the product cavity through the feed channel and the pressure is maintained. After the pressure maintenance is completed, the gas inside the gas collecting cavity is extracted through the air inlet pipe to ensure that there is no negative pressure inside the product cavity; finally, the equipment workbench is used to drive the upper mold to rise to complete the mold opening.

[0018] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0019] First, the utility model has a reasonable structural design. By providing a negative pressure environment for the product cavity, it solves the problems of bubbles on the product surface, surface shrinkage, honeycomb holes, air holes, internal loosening and interlayers in the surface layer; it improves the product qualification rate and shortens the research and development cycle of aerospace engines;

[0020] Second, the utility model improves the air tightness inside the product cavity when the mold is closed by arranging sealing components between the upper mold and the upper mold, and between the lower mold and the lower mold, thereby improving the stability of the negative pressure state inside the mold, thereby laying a foundation for improving product consistency;

[0021] Third, the utility model provides a positioning block on the lower mold and a positioning groove on the upper mold to engage with the positioning block; when the lower mold and the upper mold are closed, the clamping effect of the positioning block and the positioning groove is utilized to achieve accurate closing, thereby improving the qualified rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the front view of the utility model;

[0023] Figure 2 It is an exploded view of the utility model;

[0024] Figure 3 It is a structural schematic diagram of the upper mold of the utility model;

[0025] Figure 4 It is a structural schematic diagram of the lower mold of the utility model;

[0026] Figure 5This is a schematic diagram of the connection between the second sealing ring and the lower mold of the utility model;

[0027] Among them, 1-template assembly, 10-upper template, 11-lower template, 12-air collecting cavity, 13-air inlet pipe, 14-air return pipe, 2-mold assembly, 20-upper mold, 200-concave mold cavity, 201-first exhaust hole, 202-positioning groove, 21-lower mold, 210-punch cavity, 211-second exhaust hole, 212-positioning block, 22-feed channel, 23-card slot, 24-guide column, 25-guide sleeve, 3-sealing assembly, 30-first sealing ring, 31-second sealing ring, 32-sealing strip. DETAILED DESCRIPTION

[0028] Example 1

[0029] like Figure 1 A ceramic core mold capable of realizing negative pressure or vacuum exhaust is shown, comprising a template assembly 1, a mold assembly 2 arranged inside the template assembly 1, and a sealing assembly 3 arranged between the template assembly 1 and the mold assembly 2; the template assembly 1 comprises an upper template 10 and a lower template 11 arranged below the upper template 1, an air collecting cavity 12 is arranged inside the lower template 11, and an air inlet pipe 13 and an air return pipe 14 communicated with the air collecting cavity 12 are arranged on the side wall of the lower template 11;

[0030] like Figure 2 , 3 As shown in , 4, the mold assembly 2 includes an upper mold 20 arranged on the lower bottom surface of the upper mold 10 and fixedly connected to the upper mold 10 by locking screws, and a lower mold 21 arranged on the upper end surface of the lower mold 11 and fixedly connected to the lower mold 11 by locking screws; a concave mold cavity 200 is arranged on the lower bottom surface of the upper mold 20, and a convex mold cavity 210 is arranged on the upper end surface of the lower mold 21; when the upper mold 20 is close to the lower mold 21, the concave mold cavity 200 and the convex mold cavity 210 constitute a product cavity; a first exhaust hole 201 located outside the concave mold cavity 200 is penetrated on the upper mold 20, and a second exhaust hole 211 located outside the convex mold cavity 210 is penetrated on the lower mold 21; a feed channel 22 connected to the product cavity is arranged at the connection between the upper mold 20 and the lower mold 21.

[0031] Example 2

[0032] The difference between this embodiment and embodiment 1 is that:

[0033] like Figure 2 , 5As shown, the sealing assembly 3 includes a first sealing ring 30 arranged at the connection between the upper mold 20 and the upper template 10, a second sealing ring 31 arranged at the connection between the lower mold 21 and the lower template 11, and a sealing strip 32 arranged at the connection between the upper mold 20 and the lower mold 21; the first sealing ring 30 is located outside the first air extraction hole 201, the second sealing ring 31 is located outside the second air extraction hole 211, and the sealing strip 32 is located outside the product cavity; the upper end surface of the upper mold 20, the upper end surface and the lower bottom surface of the lower mold 21 are all provided with a card groove 23; the first sealing ring 30 is movably connected to the card groove 23 on the upper end surface of the upper mold 20; the second sealing ring 31 and the sealing strip 32 are movably connected to the card groove 23 on the upper end surface and the lower bottom surface of the lower mold 21 respectively.

[0034] Example 3

[0035] The difference between this embodiment and embodiment 2 is that:

[0036] like Figure 2 As shown, positioning blocks 212 are provided at the four corners of the upper end surface of the lower mold 21 , and positioning grooves 202 corresponding to and slidably engaging with the positioning blocks 212 are provided on the lower bottom surface of the upper mold 20 .

[0037] Example 4

[0038] The difference between this embodiment and embodiment 3 is that:

[0039] like Figure 2 , 3 As shown in FIG. 4 , a guide column 24 is provided on the upper end surface of the lower mold 21 , and a guide sleeve 25 slidably engaged with the guide column 24 is provided inside the upper mold 20 .

Claims

1. A ceramic core mold capable of achieving negative pressure or vacuum exhaust, characterized in that: The invention comprises a template assembly (1), a mold assembly (2) arranged inside the template assembly (1), and a sealing assembly (3) arranged between the template assembly (1) and the mold assembly (2); the template assembly (1) comprises an upper template (10) and a lower template (11) arranged below the upper template (10); a gas collecting cavity (12) is arranged inside the lower template (11); an air inlet pipe (13) and an air return pipe (14) which are in communication with the gas collecting cavity (12) are arranged on the side wall of the lower template (11); The mold assembly (2) comprises an upper mold (20) arranged on the lower bottom surface of the upper mold plate (10) and fixedly connected to the upper mold plate (10) by means of locking screws, and a lower mold (21) arranged on the upper end surface of the lower mold plate (11) and fixedly connected to the lower mold plate (11) by means of locking screws; a concave mold cavity (200) is arranged on the lower bottom surface of the upper mold plate (20), and a convex mold cavity (210) is arranged on the upper end surface of the lower mold plate (21); when the upper mold plate (20) is close to the lower mold plate (21), the concave mold cavity (200) and the convex mold cavity (210) constitute a product cavity; a first exhaust hole (201) located outside the concave mold cavity (200) is provided through the upper mold plate (20), and a second exhaust hole (211) located outside the convex mold cavity (210) is provided through the lower mold plate (21); a feed channel (22) communicating with the product cavity is provided at the connection between the upper mold plate (20) and the lower mold plate (21).

2. A ceramic core mold capable of achieving negative pressure or vacuum exhaust according to claim 1, characterized in that: The sealing assembly (3) comprises a first sealing ring (30) arranged at the connection between the upper mold (20) and the upper template (10), a second sealing ring (31) arranged at the connection between the lower mold (21) and the lower template (11), and a sealing strip (32) arranged at the connection between the upper mold (20) and the lower mold (21); the first sealing ring (30) is located outside the first air extraction hole (201), the second sealing ring (31) is located outside the second air extraction hole (211), and the sealing strip (32) is located outside the product cavity.

3. A ceramic core mold capable of achieving negative pressure or vacuum exhaust according to claim 2, characterized in that: The upper end surface of the upper mold (20) and the upper end surface and lower bottom surface of the lower mold (21) are all provided with a clamping groove (23); the first sealing ring (30) is movably connected with the clamping groove (23) on the upper end surface of the upper mold (20); the second sealing ring (31) and the sealing strip (32) are respectively movably connected with the clamping groove (23) on the upper end surface and lower bottom surface of the lower mold (21).

4. A ceramic core mold capable of achieving negative pressure or vacuum exhaust according to claim 1, characterized in that: Positioning blocks (212) are arranged at the four corners of the upper end surface of the lower mold (21), and the lower bottom surface of the upper mold (20) is provided with positioning grooves (202) which are slidably engaged with each of the positioning blocks (212) in a one-to-one correspondence.

5. A ceramic core mold capable of achieving negative pressure or vacuum exhaust according to claim 1, characterized in that: The upper end surface of the lower mold (21) is provided with a guide column (24), and the interior of the upper mold (20) is provided with a guide sleeve (25) which is slidably engaged with the guide column (24).

Images