Hollow rotary body mold for gel casting heating

Abstract

The utility model discloses a hollow revolved body mould for gel casting heating, which relates to the field of gel casting moulds, and comprises an outer mould and an inner mould, the outer mould is a cavity, a mould injection opening is arranged on the cavity, an opening is arranged at the lower end of the cavity, the inner mould is a hollow column with two through ends, the inner mould comprises an upper mould and a lower mould, and the upper mould and the lower mould are arranged on the upper mould. The surface of the upper mold is made of hydrophobic layer materials, the interior of the upper mold is composed of an elastomer layer, the lower mold is connected with the outer mold, the upper mold is connected with the lower mold and arranged in a cavity of the outer mold, and the inner surface of the outer mold and the outer wall of the upper mold form an injection molding cavity. Through the design of the upper mold and the lower mold of the inner mold, the shape and the size of the hollow rotary body are changed, the use range of the mold is widened, sealed heating of hollow rotary body type parts can be achieved, the preparation speed of the hollow rotary body type parts is increased, the inner elastomer layer can shrink along with a blank, and the service life of the hollow rotary body type parts is prolonged. The problems that a hollow rotary body product is difficult to demould and easy to deform and crack are solved, and the qualified rate of finished products is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding manufacturing, in particular to a hollow rotating body mold for injection molding heating. Background Technique

[0002] The injection molding process is mainly used to combine ceramic technology with organic polymer chemistry, and ingeniously introduce the method of polymerizing high molecular monomers into the ceramic molding process. By preparing a ceramic slurry with low viscosity and high solid content, a ceramic blank with high strength, high density and good uniformity can be formed with net dimensions. The process includes mold combination → adding slurry → waiting for the slurry to cure in situ → demolding → the mold enters the drying furnace for drying and debinding → machining → sintering. The existing injection molding technology has problems in the process of preparing hollow rotating body parts. It is difficult to control the drainage shrinkage of the ceramic blank, which is easy to cause the product to deform and crack and is difficult to demold; the curing time and drying time are too long, and the green body strength after curing is difficult to support demolding, resulting in damage to the green body, leading to low production efficiency, low product qualification rate or the problem of inability to produce.

[0003] The patent with the publication number CN220162794U discloses a U-shaped gel injection molding silicon nitride ceramic tube mold, which includes a bottom template. The bottom template is connected with an inner mold and an outer mold. The inner mold is arranged inside the outer mold. The inner wall of the outer mold, the outer wall of the inner mold and the top surface of the bottom film plate enclose a feeding cavity. The outer mold includes an upper mold and a lower mold. The upper mold is provided with a pouring port at the top, and a plurality of locking doors are arranged on both sides of the upper mold. A plurality of locking protrusions are arranged on both sides of the lower mold. The locking doors and the locking protrusions are matched and connected. The bottom template is a water-absorbing resin plate; the inner mold includes a hydrophobic layer, and an elastic body layer with supporting strength is wrapped inside the hydrophobic layer. This molding mold has problems in the process of making hollow products. The curing time and drying time of the ceramic blank are long. The dehydration and drying process only relies on the water-absorbing resin plate, and the preliminary drying effect is poor. The water content of the prepared green body is large and the strength is not high. Even if the mold is easy to demold, when the green body is sent to the next process, the green body is easy to damage. Content of the Utility Model

[0004] In order to solve the above-mentioned technical problems such as difficult demolding of the blank of the existing gel injection molding hollow rotating body product, easy deformation and cracking of the hollow product, too long curing and drying time, inability to introduce a heating device, insufficient drying degree, and the green body strength not supporting demolding, the utility model provides a hollow rotating body mold for injection molding heating.

[0005] The technical solution adopted by the utility model is:

[0006] A hollow rotating body device for heating in injection molding includes an outer mold and an inner mold. The outer mold is a cavity body with an injection port provided on the cavity body and an opening provided at the lower end of the cavity body. The inner mold is a hollow cylindrical shape with both ends penetrating. The inner mold includes an upper mold and a lower mold. The lower mold is connected to the outer mold through the opening at the lower end of the outer mold. The upper mold is connected to the lower mold and is placed inside the cavity of the outer mold. The inner surface of the outer mold and the outer wall of the upper mold form an injection cavity.

[0007] Further, the outer mold is connected to the lower mold through a spiral fastening structure, which enhances the overall stability of the mold.

[0008] Preferably, the spiral fastening structure includes a transverse groove on the outer mold, and an annular groove and a corresponding transverse protrusion on the lower mold are provided inside the groove.

[0009] Further, a seal is provided on the contact surface between the outer mold and the inner mold, which improves the overall sealing effect of the mold during the pouring process.

[0010] Preferably, the seal is made of rubber material.

[0011] Further, the upper mold is provided with a recessed part, and the lower mold is provided with a corresponding protruding part, which are connected by adhesive.

[0012] Further, the surface of the upper mold is made of a hydrophobic layer material, and the inside is composed of an elastomer layer. Since the internal elastomer layer can shrink with the shrinkage of the green body, it can effectively prevent the green body from cracking during the forming process.

[0013] Preferably, the elastomer layer material is a high-temperature resistant elastic material.

[0014] Further, the outer mold is provided with a positioning device corresponding to the heating device.

[0015] Further, the outer mold is provided with ear-shaped handles.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] (1) The mold of the present utility model includes an upper mold, a lower mold, and an outer mold. The structure and connection method are relatively simple, which can realize the rapid disassembly and assembly of the mold, improve the convenience of using the mold, and can modify the structure or size of some molds according to customer needs, expanding the application range of the mold;

[0018] (2) The lower mold and the outer mold of the mold of the present utility model are connected through a spiral fastening system, and different combination fixing methods can be used for the mold according to different situations, improving the tightness of the mold and increasing the stability of the mold when making blanks;

[0019] (3) The mold of the present utility model can realize the heating treatment of both the inner and outer molds simultaneously, shortening the time of the original curing process, and can realize the preliminary drying of the green body, thereby improving the strength of the green body. Combined with the disassembly and assembly of the mold, it is easy to demold.

[0020] (4) This mold can achieve the tight connection of the device, can be used for constant water bath heating, accelerate the curing and drying time, improve the demolding strength of the green body, and facilitate demolding. Description of the Drawings

[0021] Figure 1 It is a three-dimensional structural schematic diagram of a hollow rotating body device for injection molding heating;

[0022] Figure 2 It is a three-dimensional structural schematic diagram of the lower mold of a hollow rotating body device for injection molding heating;

[0023] Figure 3 It is a partial front view sectional structural schematic diagram of the outer mold of a hollow rotating body device for injection molding heating;

[0024] Figure 4 It is a front view sectional structural schematic diagram of a hollow rotating body device for injection molding heating;

[0025] Figure 5 It is a side view sectional structural schematic diagram of a hollow rotating body device for injection molding heating.

[0026] In the figure: 1, upper mold; 2, lower mold; 3, outer mold; 4, transverse groove; 5, annular groove; 6, transverse protrusion; 7, positioning device; 8, convex part; 9, hollow cylindrical; 10, rubber layer; 11, hydrophobic layer; 12, injection mold cavity; 13, injection mold inclined surface; 14, ear-shaped handle; 15, rubber film. Detailed Implementation Manner

[0027] To clearly illustrate the technical features of this solution, the present invention will be elaborated in detail below through specific implementation manners and in combination with its drawings. Many specific details are set forth in the following description in order to provide a thorough understanding of the present application. However, the present application may be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below. Unless otherwise defined, all technical terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0028] Example 1

[0029] Please refer to Figures 1 to 5, an embodiment provided by the present utility model: a hollow rotating body device for injection molding heating, including an outer mold 3 and an inner mold. The outer mold 3 is a cavity body, with an injection port 13 provided on the cavity body, and an opening at the lower end of the cavity body. The inner mold is a hollow cylindrical shape 9 with both ends penetrating. The inner mold includes an upper mold 1 and a lower mold 2. The lower mold 2 is connected to the outer mold 3 through the opening at the lower end of the outer mold. The upper mold 1 is connected to the lower mold 2 and is placed inside the cavity of the outer mold. The inner surface of the outer mold and the outer wall of the upper mold form an injection cavity.

[0030] The upper mold 1 is located at the upper end of the lower mold 2 and is connected to the lower mold 2 through a concave-convex structure, and together with the outer mold, encloses a first cavity. The lower mold 2 is tightly connected to the outer mold 3 through a screw fastening system. The outer side surface of the outer mold 3 has a horizontal bar protrusion for a positioning device 7 for positioning with a heating device, and is also equipped with a handle for easy mold removal.

[0031] During the process of preparing the hollow rotating body, the horizontal protrusion 6 of the lower mold enters the groove through the horizontal groove channel 4 to the innermost annular groove 5, and the lower mold 2 is fixed to the outer mold 3 by means of screw fastening. The rubber film 15 covers the outer surface of the lower mold 2 and the inner surface of the outer mold 3 in contact with the lower mold 2. The rubber layer 10 is tightly connected to the outer mold 3, so the outer mold 3 and the lower mold 2 can achieve complete sealing. The edge of the lower mold 2 is provided with a protrusion 8 that can engage with the rubber layer 10 at the lower end of the upper mold 1 after applying an adhesive, further strengthening the stability of the mold. Thus, the upper and lower molds form an inner mold, the inner mold and the outer mold 3 form a mold, and the upper mold and the outer mold 3 enclose a pouring cavity 12. After placing the mold in the heating device, the previously prepared injection molding slurry is poured into the cavity from the injection inclined port 13. When heating the mold, the chemical substances in the slurry are promoted to undergo in-situ curing reactions, adsorbing powders, and initially forming a green body with low strength. Heat is transferred into the interior of the green body through the mold, the moisture in the green body evaporates evenly, the green body shrinks and becomes smaller, the upper mold 1 is squeezed and deformed. After gradually forming a green body with higher strength, the mold is taken out from the heating device. After slowly pulling out the upper mold 1, the mold is inverted, and through the screw fastening system, the lower mold 2 is rotated from the outer mold 3 by the annular handle 16 at the lower end of the lower mold and slowly pulled out. Since air is filled into the part of the outer mold 3 and the lower mold 2 in contact with the green body when pulling out the lower mold 2, the adhesion force of the green body to the part in contact with the outer mold and the lower mold is reduced, making it easier to demold. And the rubber layer 10 is slowly pushed upward from the bottom, so that the rubber layer 10 generates a force on the green body to assist in demolding the green body. After demolding, the green body is sent to a drying furnace for further drying and debinding.

[0032] Embodiment 2

[0033] Please refer to Figures 1 to 5, an embodiment provided by the present utility model: a hollow rotating body device for injection molding heating, comprising an outer mold 3 and an inner mold. The outer mold 3 is a cavity body, with an injection port 13 provided on the cavity body, and an opening provided at the lower end of the cavity body. The inner mold is a hollow cylindrical shape 9 with both ends penetrating. The inner mold comprises an upper mold 1 and a lower mold 2. The lower mold 2 is connected to the outer mold 3 through the opening at the lower end of the outer mold. The upper mold 1 is connected to the lower mold 2 and is placed inside the cavity of the outer mold. The inner surface of the outer mold and the outer wall of the upper mold form an injection cavity.

[0034] The upper mold 1 is located at the upper end of the lower mold 2 and is connected to the lower mold 2 through a concave-convex structure, and together with the outer mold, encloses a first cavity; the lower mold 2 is tightly connected to the outer mold 3 through a screw fastening system; the outer side surface of the outer mold 3 has a transverse bar protrusion for positioning device 7 for positioning with a heating device, and is externally provided with a handle for easy mold removal.

[0035] Furthermore, a transverse protrusion 6 corresponding to a transverse groove is provided at the lower end of the lower mold and enters the groove through a transverse groove channel 4 provided at the lower end of the outer mold, reaching the middle annular groove 5 inside the groove. The upper mold 1 and the lower mold 2 are located inside the outer mold 3. The upper mold 1 and the lower mold 2 can be tightly engaged through a rubber layer part 10 at the lower end of the upper mold and a protruding part 8 provided at the edge of the lower mold; the rubber layer 10 can be detached from the upper mold 2. The rubber film 15 covers the outer surface of the lower mold 2 and the inner surface of the outer mold 3 in contact with the lower mold 2. The hydrophobic layer 11 covers the outer and inner side surfaces of the upper mold 1. The injection cavity 12 is formed by the outer mold 3 and the upper mold 1. The injection inclined surface 13 is located on the plane at the upper end of the outer mold 3.

[0036] In the process of preparing a hollow rotating body, the transverse protrusion 6 of the lower mold enters the inside of the groove through the transverse groove channel 4 to the innermost annular groove 5, and the lower mold 2 and the outer mold 3 are fixed by a spiral fastening method. The rubber film 15 covers the outer surface of the lower mold 2 and the inner surface of the outer mold 3 in contact with the lower mold 2. The rubber layer 10 is tightly connected to the outer mold 3, so the outer mold 3 and the lower mold 2 can be completely sealed. A protrusion 8 is provided at the edge of the lower mold 2, which can be engaged with the rubber layer 10 at the lower end of the upper mold 1 after applying an adhesive to further strengthen the stability of the mold. Thus, the upper and lower molds form an inner mold, the inner mold and the outer mold 3 form a mold, and the upper mold and the outer mold 3 enclose a pouring cavity 12. After the mold is placed in a heating device, the previously prepared injection molding slurry is poured into the cavity from the injection mold inclined port 13. The mold is heated. During the heating process, the chemical substances in the slurry are promoted to undergo an in-situ curing reaction, adsorbing the powder, and initially forming a green body with low strength. The heat is transferred into the green body through the mold, the moisture in the green body evaporates uniformly, the green body shrinks and becomes smaller, the upper mold 1 is squeezed and deformed. After gradually forming a green body with higher strength, the mold is taken out of the heating device. After slowly pulling out the upper mold 1, the mold is inverted, and through the spiral fastening system, the lower mold 2 is rotated from the outer mold 3 by the annular handle 16 at the lower end of the lower mold and slowly pulled out. Since air is filled into the part of the outer mold 3 and the lower mold 2 in contact with the green body when the lower mold 2 is pulled out, the adhesion force of the green body to the part in contact with the outer mold and the lower mold is reduced, making it easy to demold. And the rubber layer 10 is slowly pushed upward from the bottom, so that the rubber layer 10 generates a force on the green body to assist in demolding the green body. After demolding, the green body is sent to a drying furnace for further drying and debinding.

[0037] Example 3

[0038] Please refer to Figures 1 to 5 , an embodiment provided by the present utility model: an injection molding heating hollow rotating body device, including an outer mold 3 and an inner mold. The outer mold 3 is a cavity body, with an injection mold port 13 provided on the cavity body, and an opening provided at the lower end of the cavity body. The inner mold is a hollow cylindrical shape 9 with both ends penetrating. The inner mold includes an upper mold 1 and a lower mold 2. The lower mold 2 is connected to the outer mold 3 through the opening at the lower end of the outer mold. The upper mold 1 is connected to the lower mold 2 and is placed inside the cavity of the outer mold. The inner surface of the outer mold and the outer wall of the upper mold form an injection mold cavity.

[0039] The upper mold 1 is located above the lower mold 2 and is connected to the lower mold 2 through a concave-convex structure, and together with the outer mold, encloses a first cavity. The lower mold 2 is tightly connected to the outer mold 3 through a spiral fastening system. The outer side surface of the outer mold 3 has a transverse bar protrusion for a positioning device 7 for positioning with a heating device, and is also provided with a handle for easy mold removal.

[0040] During the process of manufacturing a hollow rotating body, the transverse protrusion 6 of the lower mold enters the interior of the groove through the transverse groove channel 4 until it reaches the innermost annular groove 5. The lower mold 2 and the outer mold 3 are fixed by means of screw fastening. The rubber film 15 covers the outer surface of the lower mold 2 and the inner surface of the outer mold 3 that abuts the lower mold 2. The rubber layer 10 is tightly connected to the outer mold 3, so the outer mold 3 and the lower mold 2 can achieve complete sealing. A protrusion 8 is provided at the edge of the lower mold 2, which can engage with the rubber layer 10 at the lower end of the upper mold 1 after applying an adhesive, further enhancing the stability of the mold. Thus, the upper and lower molds form an inner mold, and the inner mold and the outer mold 3 form a mold. The upper mold and the outer mold 3 enclose a pouring cavity 12. After placing the mold in a heating device, the pre-prepared injection molding slurry is poured into the cavity through the injection mold inclined opening 13. The mold is heated. During the heating process, the chemical substances in the slurry are promoted to undergo in-situ curing reactions, adsorbing the powder materials to initially form a green body with low strength. Heat is transferred into the interior of the green body through the mold, and the moisture in the green body evaporates evenly. The green body shrinks and becomes smaller. The upper mold 1 is squeezed and deformed. After gradually forming a green body with higher strength, the mold is taken out of the heating device. After slowly pulling out the upper mold 1, the mold is inverted. Through the screw fastening system, the lower mold 2 is rotated from the outer mold 3 by the annular handle 16 at the lower end of the lower mold and slowly pulled out. Since air is filled into the part of the outer mold 3 and the lower mold 2 in contact with the green body when the lower mold 2 is pulled out, the adhesion force of the green body to the part in contact with the outer mold and the lower mold is reduced, making it easier to demold. And the rubber layer 10 is slowly pushed upward from the bottom, so that the rubber layer 10 generates a force on the green body to assist in demolding the green body. After demolding, the green body is sent to a drying furnace for further drying and debinding.

[0041] Furthermore, a release agent is coated on the inner surface of the outer mold 3. When the green body shrinks slightly, the adhesion force between the green body and the outer mold 3 is extremely small, which further facilitates demolding.

[0042] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A hollow rotating body mold for heating of injection molding, characterized in that: It includes an outer mold and an inner mold, the outer mold is a hollow cavity, an injection molding port is arranged on the hollow cavity, an opening is arranged at the lower end of the hollow cavity, the inner mold is a hollow cylinder with two ends penetrated, the inner mold includes an upper mold and a lower mold, the lower mold is connected to the outer mold through the opening at the lower end of the outer mold, the upper mold is connected to the lower mold and is placed in the hollow cavity of the outer mold, and the inner surface of the outer mold and the outer wall of the upper mold form an injection molding cavity.

2. The hollow rotating body mold for heating of gel injection molding according to claim 1, characterized in that: The outer mold is connected to the lower mold through a spiral fastening structure.

3. The hollow rotating body mold for heating of gel injection molding according to claim 2, characterized in that: The spiral fastening structure includes a transverse groove of the outer mold, an annular groove inside the groove, and a transverse protrusion of the lower mold corresponding to the annular groove of the outer mold.

4. The hollow rotating body mold for heating of gel injection molding according to claim 1, characterized in that: A sealing member is provided on the contact surface between the outer mold and the inner mold.

5. The hollow rotating body mold for heating of gel injection molding according to claim 4, characterized in that: The sealing element is made of rubber material.

6. The hollow rotating body mold for heating of gel injection molding according to claim 1, characterized in that: The upper mold is provided with a concave portion, and the lower mold is provided with a corresponding convex portion.

7. The hollow rotating body mold for heating of gel injection molding according to claim 1, characterized in that: The surface of the upper mold is made of a hydrophobic layer material, and the interior is composed of an elastomer layer.

8. The hollow rotating body mold for heating of gel injection molding according to claim 7, characterized in that: The elastic body layer material is a high temperature resistant elastic material.

9. The hollow rotating body mold for heating of gel injection molding according to claim 1, characterized in that: The outer mold is provided with a positioning device corresponding to the heating device.

10. The hollow rotating body mold for heating of gel injection molding according to claim 1, characterized in that: The outer mold is provided with ear-shaped handles.

Images