Ceramic die-casting forming die capable of reducing porosity

Abstract

The utility model discloses a ceramic die-casting forming die capable of reducing porosity. The ceramic die-casting forming die comprises a fixed die, a casting die, a section die and a plurality of side punch assemblies arranged on the periphery of the fixed die. A die cavity, a punch groove and an ejector pin air hole are formed in the section die, and a spraying pump used for spraying a release agent is arranged on the top face of the casting die. The side punch assembly comprises a guide rail base, a control rod, a sliding base and a punch block, and an exhaust hole is formed in the punch block. In the working process, after primary die casting is completed, the punch block moves in the punch groove to achieve secondary compaction, residual gas in pug is exhausted, an exhaust channel is formed by combining the exhaust hole and the ejector pin air hole, and the porosity in a ceramic forming part is effectively reduced. And the release agent spraying pump is used for atomizing and spraying before the mold is closed, so that the demolding effect is improved. The device is compact in structure, has the functions of secondary compaction, exhaust and demolding, and remarkably improves the forming quality and compactness of ceramic products.

Description

Technical Field

[0001] This utility model relates to the field of ceramic production technology, specifically to a ceramic die-casting mold for reducing porosity. Background Technology

[0002] Die casting of ceramic products is a highly efficient and precise molding method widely used in the ceramic industry, especially suitable for ceramic products with complex structures or high density requirements. The basic process involves injecting slurry or ceramic clay into a mold cavity, applying pressure through a die casting mold, followed by demolding and subsequent drying and sintering.

[0003] In ceramic die casting, the mold structure directly affects the dimensional accuracy, density, and surface quality of the finished product. Especially during the pressurization stage, if residual gas inside the clay or in the mold cavity cannot be expelled in time, it can easily form pores, air pockets, or loosely structured areas in the molded body, leading to problems such as insufficient product strength, uneven density, and susceptibility to cracking. Furthermore, difficulties in mold demolding can also cause subsequent processing problems such as product sticking and deformation.

[0004] In view of this, we will study and improve the existing problems and provide a ceramic die-casting mold with reduced porosity to solve the current problems. The aim is to solve the problems and improve the practical value through this technology. Summary of the Invention

[0005] This invention aims to overcome the problems of porosity and insufficient density in the molded parts caused by residual gas during the molding process of existing ceramic die casting molds. It provides a ceramic die casting mold with reduced porosity. Through structural optimization and functional integration, the mold can perform secondary compaction after the initial die casting. It is also equipped with a venting structure with vent holes and ejector pin channels, combined with a mold cavity spray release agent system, which effectively discharges gas and improves the smoothness of demolding, thereby improving the molding quality and density of ceramic products.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A ceramic die-casting mold for reducing porosity includes a fixed mold, a casting mold, a die, and a plurality of side punch assemblies disposed on the outer periphery of the fixed mold.

[0008] in:

[0009] The mold is located inside the fixed mold, with a mold cavity and several punch slots on its inner side, and multiple ejector pin vents at the bottom; the casting die is located above the fixed mold, and a release agent spraying pump is provided on its top surface, allowing the release agent to be sprayed onto the inner surface of the mold cavity before die casting; the multiple side punch assemblies are symmetrically distributed around the outer periphery of the mold to perform secondary die casting actions, thereby improving the compaction effect and achieving mold cavity venting.

[0010] Each side punch assembly includes: a guide rail fixed to the side of the fixed mold; a control rod with one end fixed to the guide rail and the other end connected to the slide, the control rod being a bidirectional pneumatic or hydraulic structure; and a slide slidably mounted in the guide rail, with a punch block fixed to its front end.

[0011] The punch block is used to move along the punch groove direction and penetrate into the mold cavity for secondary compaction after the initial die casting; the punch block is provided with multiple vent holes to discharge residual gas in the mold cavity during the die casting or compaction process.

[0012] The release agent spraying pump can be a pneumatic atomizing nozzle with its nozzle facing the bottom of the mold cavity to ensure that the release agent is atomized and evenly covers the inner surface of the mold cavity.

[0013] The ejector pin vent forms a ventilation channel during the venting stage and creates a positive pressure venting effect during mold opening or secondary compaction, further improving venting efficiency.

[0014] The beneficial effects achieved by this utility model are as follows:

[0015] 1. Achieve secondary compaction of ceramic blanks: The side punch assembly performs secondary compaction of the initially compacted clay along the punch groove direction, which effectively improves the density of the molding and reduces molding defects;

[0016] 2. High-efficiency active venting structure: The punch block is equipped with venting holes, which, together with the ejector pin venting holes, assist in ventilation, allowing residual gas in the mold cavity to be discharged quickly, significantly reducing internal porosity;

[0017] 3. Improved release performance: The release agent spraying pump can atomize and spray the mold cavity before die casting, improving the mold's release performance and preventing adhesion or deformation of the blank surface;

[0018] In summary, this invention effectively solves the problems of gas residue and demolding difficulties in ceramic die casting. It has the advantages of simple structure, integrated functions, and significant effects, and is suitable for the molding and production of high-quality, high-density ceramic products. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of the mold and side punch assembly installation structure according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the side punch assembly structure according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the mold structure of one embodiment of the present utility model.

[0023] Figure label:

[0024] 100. Fixed mold; 110. Casting mold; 120. Die mold; 111. Release agent spray pump; 121. Mold cavity; 122. Punch groove; 123. Ejector pin vent;

[0025] 200, Side punch assembly; 210, Guide rail seat; 220, Control lever; 230, Slide; 240, Punch block; 241, Vent hole. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0027] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0028] The following is in conjunction with the appendix Figures 1-4 This invention describes a ceramic die-casting mold for reducing porosity, based on some embodiments of the present invention.

[0029] like Figures 1 to 4 As shown, this utility model provides a ceramic die-casting mold for reducing porosity, including a fixed mold 100, a casting mold 110, a die 120, and a plurality of side punch assemblies 200 disposed on the outer periphery of the fixed mold 100.

[0030] The mold 120 is installed inside the fixed mold 100. Its inner side is provided with a molding cavity 121 and several punch grooves 122 for cooperating with the side punch assembly 200 to realize the secondary die casting action. In addition, the bottom surface of the mold 120 is provided with multiple ejector pin vents 123, which can form an auxiliary venting path during the molding and venting process.

[0031] The die casting mold 110 is installed above the fixed mold 100. During the initial die casting process, it closes with the mold 120 to form a closed mold cavity. A release agent spraying pump 111 is provided on its top surface. The spraying pump 111 is a pneumatic atomizing nozzle with its nozzle facing the bottom of the mold cavity 121. Before the mold is closed, the release agent is sprayed onto the mold cavity 121 to reduce molding adhesion and improve demolding quality.

[0032] The multiple side punch assemblies 200 are symmetrically arranged around the mold 120 to perform secondary stamping after the initial die casting, thereby expelling residual gas in the mud, increasing compaction density, and reducing porosity.

[0033] Each side punch assembly 200 includes a guide rail 210, a control lever 220, a slide 230, and a punch block 240.

[0034] The guide rail seat 210 is fixedly installed on the side of the fixed mold 100 to provide sliding support;

[0035] The control lever 220 is configured as a two-way pneumatic or hydraulic structure, with one end fixed to the guide rail seat 210 and the output end connected to the slide 230, driving the slide 230 to slide back and forth in the guide rail.

[0036] The front end of the slide block 230 is connected to the punch block 240, which extends into the mold cavity 121 along the direction of the punch groove 122 under the drive of the control rod 220, so as to realize the secondary compaction of the clay.

[0037] The punch block 240 is provided with a plurality of vent holes 241. These holes are evenly distributed along the end face or circumference of the punch block, and the diameter ranges from 0.5mm to 2mm. They are used to discharge gas in the mold cavity during the stamping process to avoid the formation of bubbles.

[0038] Specifically, the control lever 220 is a bidirectional pneumatic or hydraulic drive structure used to drive the punch block 240 to reciprocate back and forth along the punch groove 122 to achieve secondary die casting. After the initial die casting, the punch block 240 moves inside the punch groove 122 to achieve secondary compaction, which reduces residual gas in the ceramic clay and improves density. The vent holes 241 are multiple small holes evenly distributed along the circumference or end face of the punch block 240, with a diameter of 0.5mm to 2mm, used to discharge gas from the mold cavity. The ejector pin vent holes 123 form a positive pressure ejection and open air passage during mold venting.

[0039] In actual use, firstly, the release agent is sprayed onto the inner surface of the mold 121 by the spray pump 111, and then the mold is closed and the initial ceramic clay is die-cast. Next, by controlling the operation of multiple side punch assemblies 200, the punch block 240 is driven to insert into the punch groove 122 to perform a secondary die-casting and compaction action, while the venting hole 241 on the punch block is used to achieve effective venting.

[0040] In addition, the ejector pin vent 123 forms a ventilation channel when the mold is opened or under secondary pressure, which further ejects the residual gas in the mold cavity and further reduces the internal porosity of the ceramic molded parts.

[0041] This structure achieves high-density compaction and effective venting of ceramic clay through sprayed release agent, integrated secondary compaction structure, and active venting channel design, significantly improving the molding density and surface quality of ceramic products. It is particularly suitable for ceramic product manufacturing scenarios with high requirements for molding defect control.

[0042] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A ceramic die-casting mold for reducing porosity, characterized in that, include: The system includes a fixed mold (100), a casting mold (110), a die (120), and multiple side punch assemblies (200) disposed on the outer periphery of the fixed mold (100). The die (120) is disposed inside the fixed mold (100), and has a mold cavity (121) and multiple punch slots (122) on its inner side. The bottom surface of the die (120) is provided with a number of ejector pin vents (123). The casting mold (110) is disposed above the fixed mold (100), and its top surface is provided with a release agent spraying pump (111) for spraying release agent into the mold cavity (121). The side punch assembly (200) includes a guide rail seat (210), a control rod (220), a slide (230), and a punch block (240) fixed to the surface of the slide (230). The control rod (220) is fixed to one side of the guide rail seat (210), and its output end is fixedly connected to the surface of the slide (230). One side of the guide rail seat (210) is fixed to the surface of the fixed mold (100). The punch block (240) is provided with an exhaust hole (241) for releasing gas in the mold during the die casting process.

2. The mold according to claim 1, characterized in that, The control rod (220) is a bidirectional pneumatic or hydraulic drive structure used to drive the punch block (240) to reciprocate back and forth along the punch groove (122) to achieve secondary die casting.

3. The mold according to claim 1, characterized in that, The punch block (240) moves inside the punch groove (122) after the initial die casting to achieve secondary compaction, which is used to reduce the residual gas in the ceramic clay and improve the density.

4. The mold according to claim 1, characterized in that, The vent hole (241) consists of multiple small holes evenly distributed along the circumference or end face of the punch block (240), with a diameter of 0.5 mm to 2 mm, used to discharge gas from the mold cavity.

5. The mold according to claim 1, characterized in that, The release agent spraying pump (111) is a pneumatic atomizing nozzle with the nozzle facing the bottom of the mold cavity (121). It is used to spray the release agent onto the mold before the mold is closed, thereby improving the molding quality.

6. The mold according to claim 1, characterized in that, The ejector pin vent (123) forms a positive pressure to eject and open the air passage when the mold is venting.

7. The mold according to claim 1, characterized in that, Multiple side punch assemblies (200) are arranged symmetrically along the outer periphery of the mold (120), and the punch blocks (240) are inserted into the corresponding punch slots (122) one by one.

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