Injection-molding mold for a side-hole article

Abstract

The utility model discloses a kind of injection molding mould of product with side hole, it is related to ceramic and hard alloy forming technical field, it includes: base;Inner core, it is located on base;Outer mould, it is located on base, outer mould is sleeved in the outer circumferential portion of inner core, and gap is equipped between the inner circumferential portion of outer mould and the outer circumferential portion of inner core;Side core, it is through outer mould and extends to one side of inner core, inner core, outer mould, side core and base are enclosed to form the cavity for pouring slurry together.This device can successfully solve the problem that hard alloy and metal ceramic product with side hole are difficult to form, the manufacturing cost is high and the cycle is long.

Description

Technical Field

[0001] This utility model relates to the field of ceramic and cemented carbide molding technology, and more specifically, to an injection molding mold for products with side holes. Background Technology

[0002] In the oil and gas industry and other fields, there are many irregularly shaped ceramic and cemented carbide parts with side holes, such as cemented carbide pump valves used in oil and gas drilling. These parts are usually expensive, mainly due to their complex manufacturing process and high processing costs. For producing ceramic and cemented carbide green blanks with side holes in the shape of sleeve cavities, there are currently two main manufacturing methods: one is to first use molding to obtain a monolithic cylindrical green blank without holes, and then perform machining to obtain the green blank with side holes. This method has low production efficiency, complex processes, and a large amount of material removal, resulting in material loss and increased costs. The other method is cold isostatic pressing followed by machining. Cold isostatic pressing usually only produces block, columnar, or cylindrical (tube-shaped) green blanks, which also require machining to obtain the final green blank with side holes, resulting in high processing costs and long cycle times.

[0003] In summary, overcoming the problems of high molding difficulty, high manufacturing cost, and long cycle time of cemented carbide or cermet products with side holes in the existing technology is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an injection molding die for products with side holes, which can successfully solve the problems of high molding difficulty, high manufacturing cost and long cycle of cemented carbide and metal ceramic products with side holes.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An injection molding die for a product with side holes, comprising:

[0007] Base;

[0008] The inner core is disposed on the base;

[0009] An outer mold is disposed on the base, the outer mold is sleeved on the outer periphery of the inner core, and a gap is provided between the inner periphery of the outer mold and the outer periphery of the inner core;

[0010] The side core penetrates the outer mold and extends to one side of the inner core. The inner core, the outer mold, the side core, and the base together enclose a cavity for injecting grout.

[0011] In one embodiment, the base has a circular hole at its center, the inner core is a columnar structure, the bottom of the columnar structure is engaged with the circular hole, and the outer diameter of the columnar structure is the same as the inner diameter of the circular hole.

[0012] In one embodiment, the base is provided with a first step structure for positioning the outer mold, the first step structure being concentrically distributed with the circular hole.

[0013] In one embodiment, one end of the outer mold is an open end, and the other end of the outer mold is a closed cylindrical structure, with the open end engaging with the base; or the outer mold is a cylindrical structure with open ends at both ends.

[0014] In one embodiment, the side core is provided with a second step structure for controlling the insertion depth of the side core.

[0015] In one embodiment, the inner core is provided with a draft taper.

[0016] In one embodiment, the bottom of the inner core is provided with a crossbar for pulling the inner core.

[0017] In one embodiment, the outer mold, the inner core, the side core, and the base are made of polytetrafluoroethylene (PTFE).

[0018] In one embodiment, the surfaces of the outer mold, the inner core, and the side core are coated with a polytetrafluoroethylene coating.

[0019] In one embodiment, the outer mold has a first through hole for the side core to pass through, and the inner core has a second through hole or groove corresponding to the first through hole and for the side core to be inserted into or abut against.

[0020] When using the injection molding mold for products with side holes provided by this utility model, firstly, the inner core is placed on the base; then, the outer mold is fitted onto the outer periphery of the inner core and placed on the base; finally, the side core passes through the outer mold and extends to one side of the inner core, so that the inner core, outer mold, side core and base together form a cavity for injecting slurry, thus completing the assembly operation of the injection molding mold for products with side holes.

[0021] After the injection molding mold for the product with side holes is assembled, a slurry such as metal or ceramic can be poured into the cavity opening. Once the slurry has cured and dried, the desired green blank with a sleeve cavity containing side holes is obtained. When demolding is required, first, remove the side core; then, disconnect the inner core from the base; finally, disconnect the outer mold from the base, and remove the complete green blank with the sleeve cavity containing side holes.

[0022] The components of this device are assembled via a plug-in method, resulting in a simple structure and convenient assembly and disassembly. Demolding is performed in the following order: first the side core, then the inner core, and finally the outer mold and base. This effectively avoids damage to the green blank during demolding, ensuring its integrity. Furthermore, by setting the inner core, outer mold, and side core according to usage requirements, side holes can be integrally formed during injection molding, eliminating the cumbersome machining steps required after traditional compression molding or isostatic pressing. This significantly reduces processing costs, minimizes material waste, and substantially improves production efficiency. Moreover, this device is particularly suitable for the injection molding of irregularly shaped sleeve-like cemented carbide or cermet products with side holes. By changing the inner core, outer mold, and side core of different sizes, it can adapt to the production needs of products with side holes of various specifications and shapes.

[0023] In summary, the injection molding die for products with side holes provided by this utility model can successfully solve the problems of high molding difficulty, high manufacturing cost, and long cycle of cemented carbide and metal ceramic products with side holes. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the injection molding die for the product with side holes provided by this utility model from a top view.

[0026] Figure 2 for Figure 1 AA cross-section view;

[0027] Figure 3 This is a schematic diagram of the side core structure;

[0028] Figure 4 This is a schematic diagram of the base structure;

[0029] Figure 5 This is a schematic diagram of the inner core structure;

[0030] Figure 6 This is a schematic diagram of the outer mold structure;

[0031] Figure 7 This is a schematic diagram of the structure of the green body.

[0032] Figures 1-7 middle:

[0033] 1 is the base, 11 is the first step structure, 2 is the outer mold, 21 is the first through hole, 3 is the inner core, 31 is the horizontal bar, 32 is the second through hole, 4 is the side core, 41 is the second step structure, and 5 is the green blank. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] The core of this utility model is to provide an injection molding die for products with side holes, which can successfully solve the problems of high molding difficulty, high manufacturing cost and long cycle of cemented carbide and metal ceramic products with side holes.

[0036] Please refer to Figure 1 and Figure 2 This specific embodiment provides an injection molding die for a product with side holes, comprising:

[0037] Base 1;

[0038] Inner core 3, which is located on base 1;

[0039] Outer mold 2 is mounted on base 1 and is fitted around the outer periphery of inner core 3, with a gap between the inner periphery of outer mold 2 and the outer periphery of inner core 3.

[0040] Side core 4 penetrates the outer mold 2 and extends to one side of the inner core 3. The inner core 3, outer mold 2, side core 4 and base 1 together enclose a cavity for injecting grout.

[0041] It should be noted that the inner core 3 is detachably mounted on the base 1, the outer mold 2 is detachably mounted on the base 1, and the side core 4 is detachably mounted on the outer mold 2 and the inner core 3. That is, all components of this device are detachable, which makes the injection molding mold for products with side holes easy to disassemble and demold, and can be reused. It can produce a complete green blank 5 of irregular alloy products with side holes (i.e., products with side holes) without the need for subsequent machining of side holes, thereby reducing costs, improving efficiency, and simplifying operation.

[0042] In practical applications, the shape, structure, size, material, and number of the base 1, inner core 3, outer mold 2, and side core 4 can be determined according to the actual situation and needs.

[0043] When using the injection molding mold for products with side holes provided by this utility model, firstly, the inner core 3 is placed on the base 1; then, the outer mold 2 is fitted onto the outer periphery of the inner core 3 and placed on the base 1; finally, the side core 4 passes through the outer mold 2 and extends to one side of the inner core 3, so that the inner core 3, the outer mold 2, the side core 4 and the base 1 together form a cavity for injecting slurry, thus completing the assembly operation of the injection molding mold for products with side holes.

[0044] After the injection molding mold for the product with side holes is assembled, a slurry such as metal or ceramic can be poured into the cavity opening. After the slurry has cured and dried, the desired green blank 5 with a sleeve cavity and side holes can be obtained. When demolding is required, first, pull out the side core 4, then disconnect the inner core 3 from the base 1, and finally disconnect the outer mold 2 from the base 1 to remove the complete green blank 5 with a sleeve cavity and side holes.

[0045] The components of this device are assembled using a plug-in method, resulting in a simple structure and convenient assembly and disassembly. Demolding is performed in the following order: first the side core 4, then the inner core 3, and finally the outer mold 2 and base 1. This effectively avoids damage to the green blank 5 during demolding, ensuring its integrity. Furthermore, by setting the inner core 3, outer mold 2, and side core 4 according to usage requirements, side holes can be integrally formed during injection molding, eliminating the cumbersome machining steps required after traditional compression molding or isostatic pressing, significantly reducing processing costs, minimizing material waste, and substantially improving production efficiency. This device is particularly suitable for injection molding of irregularly shaped sleeve-like cemented carbide or cermet products with side holes. By changing the inner core 3, outer mold 2, and side core 4 of different sizes, it can adapt to the production needs of products with side holes of various specifications and shapes.

[0046] In summary, the injection molding die for products with side holes provided by this utility model can successfully solve the problems of high molding difficulty, high manufacturing cost, and long cycle of cemented carbide and metal ceramic products with side holes.

[0047] In one embodiment, such as Figure 4 As shown, a circular hole is provided at the center of the base 1, and the inner core 3 is a columnar structure. The bottom of the columnar structure is engaged with the circular hole, and the outer diameter of the columnar structure is the same as the inner diameter of the circular hole. One end of the inner core 3 is embedded in the circular hole of the base 1, and the other end of the inner core 3 is a free end, thus forming the inner wall of the sleeve cavity together with the outer mold 2.

[0048] In one embodiment, such as Figure 4As shown, the base 1 is provided with a first step structure 11 for positioning the outer mold 2, and the first step structure 11 is concentrically distributed with the circular hole. The first step structure 11 can effectively prevent the outer mold 2 from shaking or shifting during assembly and slurry pouring, ensuring the coaxiality of the mold and the accuracy of the cavity dimensions. That is, the first step structure 11 can ensure the accurate installation and concentricity of the outer mold 2.

[0049] In one embodiment, such as Figure 6 As shown, the outer mold 2 has an open end and a closed cylindrical structure at the other end, with the open end engaging with the base 1. Furthermore, bolts or other components can be used to reinforce the connection between the outer mold 2 and the base 1. After the injection molding mold for the product with side holes is assembled, slurry such as metal or ceramic can be poured into the open end of the outer mold 2. Alternatively, the outer mold 2 can also be a cylindrical structure with open ends, one end of which engages with the base 1 to form a closed structure, while the other end serves as the slurry inlet.

[0050] In one embodiment, such as Figure 3 As shown, the side core 4 is provided with a second step structure 41 for controlling the insertion depth of the side core 4. The second step structure 41 abuts against the outer wall of the outer mold 2, which can not only accurately position the position and depth of the side core 4 extending into the cavity and ensure the accuracy of the side hole position, but also facilitate the application of force to pull out the side core 4 during subsequent demolding.

[0051] In one embodiment, such as Figure 5 As shown, the inner core 3 has a draft taper. That is, the outer diameter of the inner core 3 decreases slightly from top to bottom (or from the end away from the base 1 to the end near the base 1). This design significantly reduces the resistance when removing the inner core 3.

[0052] In one embodiment, such as Figure 5 As shown, the bottom of the inner core 3 is provided with a horizontal bar 31 for pulling out the inner core 3. The operator can easily pull the inner core 3 out of the cured blank by clamping or hooking the horizontal bar 31, so as to further optimize the demolding operation and reduce the labor intensity of the operator.

[0053] In one embodiment, the outer mold 2, inner core 3, side core 4, and base 1 are made of polytetrafluoroethylene material.

[0054] It should be noted that the outer mold 2, inner core 3, side core 4, and base 1 are made of polytetrafluoroethylene (PTFE). The extremely low surface tension and non-adhesive properties of PTFE ensure minimal adhesion between the slurry and the surface of the injection molding mold with side holes, making it extremely difficult for the slurry to wet the surface. This makes the demolding process very smooth and further ensures the integrity of the green body 5. This helps to solve the problem that the injection molding slurry easily sticks to the mold, leading to demolding difficulties and damage to the green body.

[0055] It should also be noted that components such as the outer mold 2, inner core 3, side core 4, and base 1 are all made of polytetrafluoroethylene (PTFE) through injection molding, machining, or 3D printing to quickly manufacture molds with more complex structures and to meet usage requirements. PTFE molds can be mass-produced through injection molding. For complex structures or small-batch requirements, a combination of machining and 3D printing methods can be used to directly form the molds, thus meeting different precision and complexity requirements.

[0056] In one embodiment, the surfaces of the outer mold 2, inner core 3, and side core 4 are coated with a polytetrafluoroethylene coating.

[0057] It should be noted that if stainless steel components are used to make the mold body (outer mold 2, inner core 3, side core 4, and base 1, etc.), a layer of polytetrafluoroethylene (PTFE) coating can be applied to all mold surfaces in contact with the slurry (cavity surface of base 1, inner wall of outer mold 2, outer wall of inner core 3, and outer wall of side core 4). This structure ensures both mold strength and utilizes the non-stick properties of PTFE. In other words, while ensuring mold strength and rigidity (e.g., the mold body is made of metal, glass, or other polymer materials), the non-stick properties of PTFE can be achieved through surface treatment (coating with a layer of PTFE), reducing the overall cost of the mold and allowing for multiple reuses. Compared to conventional materials such as polyethylene, polypropylene, and polyurethane, PTFE is the most effective in preventing slurry adhesion, can be reused multiple times, has a long service life, and thus reduces the amortized cost of the mold.

[0058] In one embodiment, such as Figure 5 and Figure 6 As shown, the outer mold 2 has a first through hole 21 for the side core 4 to pass through, and the inner core 3 has a second through hole 32 or groove corresponding to the first through hole 21 for the side core 4 to be partially inserted into or abut against. After the side core 4 passes through the first through hole 21, the end of the side core 4 can be inserted into the second through hole 32 or groove on the inner core 3 to better position the side core 4 and form a complete cavity with a side hole; or, the end of the side core 4 can simply abut against the outer wall of the inner core 3, which can also form a cavity with a side hole.

[0059] To further illustrate the structure and usage of the injection molding die for products with side holes provided by this utility model, examples will be given below.

[0060] The inner core 3 is a cylinder with a slight draft taper, and its bottom is integrally formed with a laterally extending crossbar 31. The outer mold 2 is cylindrical, and its side wall has a circular first through hole 21. The side core 4 is a stepped shaft, including a working section with a smaller diameter and a gripping section with a larger diameter, and a second step structure 41 is formed between the two sections. The inner core 3 has a blind hole (such as a second through hole 32 or a groove) at the position corresponding to the first through hole 21 of the outer mold 2.

[0061] During assembly, the lower end of the inner core 3 is inserted into the circular hole at the center of the base 1. The outer mold 2 is fitted onto the first stepped structure 11 of the base 1. The working section of the side core 4 passes through the first through hole 21 of the outer mold 2 and is inserted into the second through hole 32 of the inner core 3 until the second stepped structure 41 contacts the outer wall of the outer mold 2. Hard alloy slurry is poured in, and after curing, the side core 4 and the inner core 3 are pulled out in sequence. Finally, the outer mold 2 and the base 1 are removed to obtain a sleeve-shaped green blank 5 with side holes.

[0062] It should be noted that the first step structure 11 and the second step structure 41, the first through hole 21 and the second through hole 32 mentioned in this application are only distinguished by their different positions and do not have any order of precedence.

[0063] In addition, it should be noted that the orientation or positional relationship indicated by terms such as "inside and outside" in this application is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the purpose of simplifying the description and making it easier to understand, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0064] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Any combination of all embodiments provided by this utility model is within the protection scope of this utility model and will not be elaborated upon here.

[0065] The injection molding die for products with side holes provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A casting mold for products with side holes, characterized in that, include: Base (1); The inner core (3) is disposed on the base (1); An outer mold (2) is provided on the base (1). The outer mold (2) is sleeved on the outer periphery of the inner core (3), and there is a gap between the inner periphery of the outer mold (2) and the outer periphery of the inner core (3). The side core (4) penetrates the outer mold (2) and extends to one side of the inner core (3). The inner core (3), the outer mold (2), the side core (4) and the base (1) together enclose a cavity for injecting grout.

2. The injection molding die for a product with side holes according to claim 1, characterized in that, The base (1) has a circular hole at its center. The inner core (3) is a columnar structure. The bottom of the columnar structure is engaged with the circular hole. The outer diameter of the columnar structure is the same as the inner diameter of the circular hole.

3. The injection molding die for a product with side holes according to claim 2, characterized in that, The base (1) is provided with a first step structure (11) for positioning the outer mold (2), and the first step structure (11) is concentrically distributed with the circular hole.

4. The injection molding die for an article with side holes according to claim 3, characterized in that, One end of the outer mold (2) is an open end, and the other end of the outer mold (2) is a closed cylindrical structure. The open end is engaged with the base (1); or the outer mold (2) is a cylindrical structure with open ends at both ends.

5. The injection molding die for an article with side holes according to any one of claims 1 to 4, characterized in that, The side core (4) is provided with a second step structure (41) for controlling the insertion depth of the side core (4).

6. The injection molding die for an article with side holes according to any one of claims 1 to 4, characterized in that, The inner core (3) is provided with a draft taper.

7. The injection molding die for an article with side holes according to claim 6, characterized in that, The bottom of the inner core (3) is provided with a horizontal bar (31) for pulling the inner core (3).

8. The injection molding die for an article with side holes according to any one of claims 1 to 4, characterized in that, The outer mold (2), the inner core (3), the side core (4), and the base (1) are made of polytetrafluoroethylene material.

9. The injection molding die for an article with side holes according to any one of claims 1 to 4, characterized in that, The surfaces of the outer mold (2), the inner core (3), and the side core (4) are coated with a polytetrafluoroethylene coating.

10. The injection molding die for an article with side holes according to any one of claims 1 to 4, characterized in that, The outer mold (2) has a first through hole (21) through which the side core (4) passes, and the inner core (3) has a second through hole (32) or groove corresponding to the first through hole (21) and for the side core (4) to be partially inserted into or abutted.

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