Die for tubular nozzle

Abstract

The utility model discloses a mold for a tubular nozzle, which is characterized in that a movable mold assembly is arranged below a fixed mold assembly, and the fixed mold assembly and the movable mold assembly form a volume cavity in a press fit state; a runner cavity is formed in the fixed mold assembly, one side of the runner cavity is communicated with the volume cavity, and the other side of the runner cavity is communicated with the outside; a needle mold assembly is arranged on one side of the movable mold assembly, and one end of the needle mold assembly penetrates through the inner side of the volume cavity and reciprocates in the axial direction of the volume cavity; the movable mold assembly further comprises a jacking assembly, and the volume cavity is located above the jacking assembly and controls the jacking assembly to move in the direction of the fixed mold assembly. By designing the pressing mold structure, the pouring gate structure and the ejection mode of the mold, warping, concentricity errors, ejection deformation and the like are effectively reduced, so that most key performance of a product is achieved in the injection stage, the machining amount after sintering can be greatly reduced, and therefore, the efficiency can be effectively improved, and the cost can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mold processing, in particular to a mold for a tubular nozzle. Background Art

[0002] The common production methods for slender, thin-walled ceramic nozzles are cold isostatic pressing (QIP) of greenware or injection molding. However, due to process limitations, cold isostatic pressing can only produce simple cylindrical greenware, and the precision is low. This results in large and uneven product margins after molding, and the ceramic greenware has a very high hardness after sintering. This also leads to long processing times after demolding and rapid tool wear, resulting in low machining efficiency and high costs.

[0003] When powder metallurgy injection molding is used to produce ceramic green bodies, the uneven distribution of slender thin-walled tubes during injection filling leads to poor concentricity, easy warping, and ejection deformation, etc. Therefore, the injection molding yield is low and the consumption cost is high. In order to reduce costs, the method of increasing the green body allowance and lowering the green body requirements is generally adopted. This will also cause the problem of large machining volume, low efficiency and high cost after sintering. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings in the prior art and to propose a mold for a tubular nozzle.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a mold for a tubular nozzle, comprising:

[0006] Fixed mold assembly;

[0007] A movable mold assembly is provided below the fixed mold assembly, and the fixed mold assembly and the movable mold assembly form a volume cavity in a pressed state;

[0008] The fixed mold assembly is provided with a flow channel cavity, one side of the flow channel cavity is connected to the volume cavity, and the other side is connected to the outside, so that the material enters the volume cavity for forming;

[0009] A needle mold assembly is provided on one side of the movable mold assembly, one end of the needle mold assembly is inserted into the inner side of the volume cavity and reciprocates along the axial direction of the volume cavity;

[0010] The movable mold assembly also includes a lifting assembly, the volume cavity is located above the lifting assembly, the fixed mold assembly and the movable mold assembly change from the pressed state to the open mold state, and the lifting assembly is controlled to move toward the fixed mold assembly for demolding.

[0011] As a further description of the above technical solution: the fixed mold assembly includes a fixed mold base plate, a positioning ring is provided above the fixed mold base plate, and slots are formed in the positioning ring and the fixed mold base plate.

[0012] As a further description of the above technical solution: a fixed mold plate is installed below the fixed mold base plate, a groove is provided on the lower end surface of the fixed mold plate, a fixed mold is installed on the inner side of the groove, the runner cavity is provided on the inner side of the fixed mold, and the fixed mold is provided with a gate sleeve to connect the runner cavity with the notch, and a cavity is provided on the lower end surface of the fixed mold to connect with the runner cavity.

[0013] As a further description of the above technical solution: the movable mold assembly includes a movable mold base plate, and a plurality of support columns are also provided on the movable mold base plate. The plurality of support columns are connected to the movable mold plate to form a gap between the movable mold base plate and the movable mold plate.

[0014] As a further description of the above technical solution: a groove is provided on the upper end surface of the movable template, a movable mold is installed in the groove, and the jacking assembly is provided on the inner side of the movable mold.

[0015] As a further description of the above technical solution: a fixed plate is provided on the movable mold base plate, a push plate is installed on the fixed plate, and a plurality of support columns pass through the fixed plate and the push plate.

[0016] As a further description of the above technical solution: an elastic component is provided between the push plate and the movable mold plate, and the push plate is connected to the lifting component to drive the lifting component to move in or out of the movable mold.

[0017] As a further description of the above technical solution: the lifting assembly includes a push block, which is arranged on the inner side of the movable mold, and a plurality of first ejectors are arranged below the push block, and the plurality of first ejectors are arranged to pass through the movable mold plate and be connected to the push plate.

[0018] As a further description of the above technical solution: a plurality of second ejectors are provided on the push plate, and the plurality of second ejectors pass through the movable template and extend to the flow channel cavity or the volume cavity.

[0019] As a further description of the above technical solution: the needle mold assembly includes a driving mechanism, the driving mechanism is installed on the movable mold plate, the output end of the driving mechanism is provided with a sliding sleeve, the inner side of the sliding sleeve is provided with a needle body, and the driving mechanism drives the needle body to move into or out of the volume cavity;

[0020] An outwardly extending protrusion is provided at one end of the needle body close to the driving mechanism, and a gate is formed between the needle body and the protrusion.

[0021] The above technical solution has the following advantages or beneficial effects:

[0022] By designing the die structure, gate structure and ejection method of the mold, it is possible to effectively reduce warpage, concentricity error, ejection deformation, etc., thereby achieving most of the key performance of the product during the injection stage and greatly reducing the amount of machining after sintering, thereby effectively improving efficiency and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional view of the mold in the pressed state proposed by the present invention;

[0024] Figure 2 This is a side sectional view of the mold in the pressed state proposed by the present invention;

[0025] Figure 3 This is a cross-sectional view of the mold in the open mold state proposed by the present invention;

[0026] Figure 4 It is a structural diagram of the jacking assembly and product molding in the utility model;

[0027] Figure 5 It is a structural diagram of the product in this utility model;

[0028] Figure 6 It is a cross-sectional view of the product in this utility model;

[0029] Figure 7 This is a partial enlarged view of the gate of the product in this utility model;

[0030] Figure 8 This is a cold isostatic pressing green body diagram of the product in this utility model;

[0031] Figure 9 This is a green injection molded part diagram of the product of the present utility model;

[0032] Figure 10 This is a schematic diagram of the gate of an existing product;

[0033] Figure 11 A magnified view of the gate of an existing product;

[0034] Figure 12 Schematic diagram of the ejection structure of an existing mold.

[0035] Legend:

[0036] 1. Fixed mold base plate; 2. Positioning ring; 3. Fixed mold plate; 4. Fixed mold; 5. Moving mold base plate; 6. Support column; 7. Moving mold plate; 8. Moving mold; 9. Fixed plate; 10. Push plate; 11. Elastic component; 12. Push block; 13. First ejector pin; 14. Second ejector pin; 15. Driving mechanism; 16. Sliding sleeve; 17. Needle body; 18. Gate sleeve; 19. Gate; 20. Material. DETAILED DESCRIPTION

[0037] 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 are within the scope of protection of the present invention.

[0038] Reference Figure 1-Figure 7 The utility model provides an embodiment: a mold for a tubular nozzle, comprising: a fixed mold assembly; a movable mold assembly is arranged below the fixed mold assembly, and the fixed mold assembly and the movable mold assembly form a volume cavity in a pressed state; the fixed mold assembly is provided with a flow channel cavity, one side of the flow channel cavity is connected to the volume cavity, and the other side is connected to the outside, so that the material 20 enters the volume cavity for molding; a needle mold assembly is provided on one side of the movable mold assembly, one end of the needle mold assembly is penetrated to the inner side of the volume cavity, and moves back and forth along the axial direction of the volume cavity; the movable mold assembly also includes a lifting assembly, and the volume cavity is located above the lifting assembly, and the fixed mold assembly and the movable mold assembly change from a pressed state to an open mold state, and the lifting assembly is controlled to move toward the direction of the fixed mold assembly for demolding.

[0039] During the research process, the applicant found that the following defects would occur when the tube nozzle processing mold is injection molded according to the existing design mold: 1. Product warping. After injection cooling, the injected ceramic green body is obviously warped and forms a bow shape. 2. Axial cracking. 3. Air entrapment. 4. Ejection deformation. Figure 8 As shown, the gate 19 form of the existing mold design. The gate 19 is designed to be uniformly annular (such as Figure 10 and Figure 11 As shown in the figure, the material flow direction is axial feeding, which is easy to form jets, resulting in uneven filling and air entrapment. Since the molten material 20 enters the annular gate 19 from one side, it will cause uneven filling, so that the injection front cannot fill the same cross section at the same time, resulting in temperature differences and warping. In addition, the uneven filling causes the material flow at both ends of the cylindrical part to wrap around the filling during molding, resulting in weld marks and causing axial cracking. Figure 12 The ejection method shown in FIG. 1 is an existing mold design. The ejection is performed by a circular ejector pin 23, which has a small ejection area, few points of force, and high pressure, resulting in product deformation during ejection and internal stress, which further deforms the product after sintering.

[0040] In this embodiment, the fixed mold assembly and the movable mold assembly are controlled to be pressed together to form a volume cavity, and the needle mold assembly is controlled to extend into the inner side of the volume cavity so that the volume cavity forms a tubular cavity. The molten ceramic material 20 is then injected through the injection molding machine. The molten ceramic material 20 is injected into the gate sleeve 18 through the injection molding machine nozzle, passes through the main channel and the branch channel of the runner cavity to reach the gate 19, and enters the volume cavity through the gate 19 to form a slender, thin-walled tubular ceramic green body. When injecting the material 20, the material 20 can be made to enter the volume cavity in a radial direction to avoid too much material 20 entering to form injection and trapped air. After molding, the needle mold assembly is controlled to move out of the volume cavity, the fixed mold assembly and the movable mold assembly are opened, and the molded product is moved out of the movable mold 8 through the lifting assembly, and the product is removed for subsequent machining. By designing the die structure, gate 19 structure and ejection method of the mold, it is possible to effectively reduce warpage, concentricity error, ejection deformation, etc., thereby achieving most of the key performance of the product in the injection stage, and greatly reducing the amount of machining after sintering, thereby effectively improving efficiency and reducing costs.

[0041] The fixed mold assembly includes a fixed mold base plate 1, a positioning ring 2 is provided above the fixed mold base plate 1, and a slot is provided between the positioning ring 2 and the fixed mold base plate 1; a fixed mold plate 3 is installed below the fixed mold base plate 1, and a groove is provided on the lower end surface of the fixed mold plate 3, and a fixed mold 4 is installed on the inner side of the groove, and a runner cavity is provided on the inner side of the fixed mold 4, and a gate sleeve 18 is provided on the fixed mold 4 to connect the runner cavity with the slot, and a cavity is provided on the lower end surface of the fixed mold 4 to connect with the runner cavity.

[0042] In this embodiment, a positioning ring 2 is installed on the fixed mold base plate 1, and the mold is aligned and positioned with the injection molding machine through the positioning ring 2. Then, the fixed mold base plate 1 is pressed against the fixed mold mounting plate of the injection molding machine, and the movable mold base plate 5 is pressed against the movable mold mounting plate of the injection molding machine, and the mold is installed and positioned on the injection molding machine. During injection, the nozzle of the injection molding machine is pressed against the gate sleeve 18 through the positioning ring 2 and pressed, so that the injection port of the injection molding machine is connected and sealed with the mold. The runner cavity includes a main channel and a branch channel. The axial direction of the main channel is perpendicular to the axial direction of the branch channel, and the axis of the branch channel is perpendicular to the axial direction of the volume cavity. When injecting the material 20, a certain buffer can be performed to make the material 20 more evenly distributed and prevent air entrapment, so that the material 20 flows into the cavity below the fixed mold 4.

[0043] The movable mold assembly includes a movable mold base plate 5, which is also provided with a number of support columns 6. The number of support columns 6 are connected to the movable mold plate 7, so that a gap is formed between the movable mold base plate 5 and the movable mold plate 7; a groove is provided on the upper end surface of the movable mold plate 7, in which a movable mold 8 is installed, and a lifting assembly is provided on the inner side of the movable mold 8; a fixed plate 9 is provided on the movable mold base plate 5, and a push plate 10 is installed on the fixed plate 9, and a number of support columns 6 pass through the fixed plate 9 and the push plate 10; an elastic component 11 is provided between the push plate 10 and the movable mold plate 7, and the push plate 10 is connected to the lifting assembly to drive the lifting assembly to move in or out of the movable mold 8.

[0044] In this embodiment, the injection molding machine is connected to the movable mold assembly, driving the movable mold assembly to move toward the fixed mold assembly for pressing. In the pressed state, the fixed mold 4 and the movable mold 8 form a surface contact, and the cavity of the fixed mold 4 and the cavity of the movable mold 8 form a volume cavity. When the mold is switched to the open state, the injection molding machine drives the movable mold assembly to move away from the fixed mold assembly. A connector is provided below the fixed plate 9, located inside the movable mold base plate 5, and can be connected to the injection molding machine. The injection molding machine pushes the fixed plate 9 and the push plate 10 upward from below, and the elastic component 11 is compressed, so that the push block 12 of the jacking assembly moves out of the movable mold 8, and the molded product can be removed. After completion, the injection molding machine resets, and the elastic component 11 extends, causing the fixed plate 9 and the push plate 10 to reset. The elastic component 11 is preferably a spring.

[0045] The jacking assembly includes a push block 12 , which is arranged inside the movable mold 8 . A plurality of first ejector pins 13 are arranged below the push block 12 . The plurality of first ejector pins 13 are arranged to penetrate the movable mold plate 7 and connect with the push plate 10 .

[0046] In this embodiment, the shape of the upper end face of the push block 12 is the same as the shape of the cavity of the upper end face of the movable mold 8, and the material 20 can be pressed and formed. Two first ejectors 13 are provided under the push block 12 to enable the push block 12 to move out of the movable mold 8 smoothly. The lifting assembly can increase the contact surface, reduce the ejection stress, ensure that the ejection deformation and internal stress are within a controllable range, and improve the yield rate of the green body and subsequent machining.

[0047] A plurality of second ejector pins 14 are provided on the push plate 10 , and the plurality of second ejector pins 14 penetrate the movable plate 7 and extend to the flow channel cavity or the volume cavity.

[0048] In this embodiment, the second ejector pin 14 can be extended to the flow channel cavity, the volume cavity, or both to prevent the excess formed material 20 from bending and deforming the product under the action of gravity when the product is ejected.

[0049] The needle mold assembly includes a drive mechanism 15, which is mounted on the movable mold plate 7. A sliding sleeve 16 is provided at the output end of the drive mechanism 15, and a needle body 17 is provided inside the sliding sleeve 16. The drive mechanism 15 drives the needle body 17 to move into or out of the volume cavity.

[0050] An end of the needle body 17 close to the driving mechanism 15 is provided with an outwardly extending protrusion, forming a gate 19 between the needle body 17 and the protrusion.

[0051] In this embodiment, the driving mechanism 15 is an oil cylinder, and the output end is connected to the sliding sleeve 16. A needle body 17 is provided on the inner side of the sliding sleeve 16. The driving mechanism 15 drives the needle body 17 to move back and forth, so that the volume cavity forms a tubular structure. The gate 19 changes the material flow direction to radial feeding on the basis of the original ring shape to avoid the formation of injection and trapped air; and by designing the radial thickness of the gate 19 to be a gradual structure (A→B gradually increases), the change in the radial thickness of the gate 19 is determined according to the axial injection filling speed to implement filling balance, reduce the change in temperature difference, reduce the generation of internal stress, and thus reduce warping deformation, so as to achieve most of the product precision requirements in the injection stage, not only improve the yield rate of the green body, but also greatly reduce the cost of the subsequent process.

[0052] Reference Figure 8 and Figure 9 By using the mold designed in this application to perform two processing processes, cold isostatic pressing and injection green body, the ceramic material 20 has less injection margin and is more uniform, which can save raw material costs, greatly reduce the amount of subsequent machining, reduce machining costs, and improve production efficiency.

[0053] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mold for a tubular nozzle, characterized in that: include: Fixed mold assembly; A movable mold assembly is provided below the fixed mold assembly, and the fixed mold assembly and the movable mold assembly form a volume cavity in a pressed state; The fixed mold assembly is provided with a flow channel cavity, one side of the flow channel cavity is connected to the volume cavity, and the other side is connected to the outside, so that the material enters the volume cavity for forming; A needle mold assembly is provided on one side of the movable mold assembly, one end of the needle mold assembly is inserted into the inner side of the volume cavity and reciprocates along the axial direction of the volume cavity; The movable mold assembly also includes a lifting assembly, the volume cavity is located above the lifting assembly, the fixed mold assembly and the movable mold assembly change from the pressed state to the open mold state, and the lifting assembly is controlled to move toward the fixed mold assembly for demolding.

2. The mold according to claim 1, characterized in that: The fixed mold assembly includes a fixed mold base plate, a positioning ring is arranged above the fixed mold base plate, and slots are formed on the positioning ring and the fixed mold base plate.

3. The mold according to claim 2, characterized in that: A fixed mold plate is installed below the fixed mold base plate, a groove is provided on the lower end surface of the fixed mold plate, a fixed mold is installed inside the groove, the runner cavity is provided inside the fixed mold, and a gate sleeve is provided on the fixed mold to connect the runner cavity with the notch, and a cavity is provided on the lower end surface of the fixed mold to connect with the runner cavity.

4. The mold according to claim 1, characterized in that: The movable mold assembly includes a movable mold base plate, and a plurality of support columns are also provided on the movable mold base plate. The plurality of support columns are connected to the movable mold plate to form a gap between the movable mold base plate and the movable mold plate.

5. The mold according to claim 4, characterized in that: A groove is provided on the upper end surface of the movable platen, the movable die is installed in the groove, and the jacking assembly is provided on the inner side of the movable die.

6. The mold according to claim 5, characterized in that: A fixed plate is provided on the movable mold base plate, a push plate is installed on the fixed plate, and a plurality of support columns pass through the fixed plate and the push plate.

7. The mold according to claim 6, characterized in that: An elastic component is provided between the push plate and the movable platen, and the push plate is connected to the lifting component to drive the lifting component to move into or out of the movable mold.

8. The mold according to claim 6, characterized in that: The lifting assembly includes a push block, which is arranged on the inner side of the movable mold. A plurality of first ejectors are arranged below the push block, and the plurality of first ejectors are arranged to pass through the movable mold plate and be connected to the push plate.

9. The mold according to claim 6, characterized in that: A plurality of second ejectors are provided on the push plate, and the plurality of second ejectors pass through the movable template and extend to the flow channel cavity or the volume cavity.

10. The mold according to claim 4, characterized in that: The needle mold assembly includes a driving mechanism, which is installed on the movable mold plate. The output end of the driving mechanism is provided with a sliding sleeve, and the inner side of the sliding sleeve is provided with a needle body. The driving mechanism drives the needle body to move into or out of the volume cavity; An outwardly extending protrusion is provided at one end of the needle body close to the driving mechanism, and a gate is formed between the needle body and the protrusion.

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