Molding tool for long and thin hard alloy nozzle
By designing the soft mold and core rod assembly, the problem of core rod loosening in the cemented carbide slender nozzle forming tooling was solved, achieving high-precision powder blank inner hole forming and ensuring product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2026-03-20
AI Technical Summary
In existing cemented carbide slender nozzle forming tooling, the split mandrel is prone to misalignment and loosening during cold isostatic pressing, resulting in poor forming accuracy of the inner hole of the product blank and making it difficult to guarantee product quality.
The design employs a soft mold and core rod assembly, including an upper core rod and a lower core rod. The upper and lower core rods are fixedly connected by a first step and fasteners, and are equipped with an upper soft mold plug and a lower soft mold plug to maintain concentricity and seal, preventing loosening.
Maintaining the connection accuracy of the upper and lower mandrels during cold isostatic pressing improves the forming accuracy of the inner hole of the product blank, ensuring product quality.
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Figure CN224011233U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to special-shaped nozzle processing technical field, especially relates to a hard alloy slender nozzle's forming frock. BACKGROUND
[0002] Hard alloy nozzle is widely used in petroleum drilling, traffic engineering, building engineering, pipeline and other large equipment and parts coating engineering and surface sand blasting, rust removal, decontamination treatment and other fields because of its high hardness, high temperature resistance, excellent wear resistance and corrosion resistance, long service life, high cost performance and other advantages.
[0003] The processing of hard alloy slender special-shaped nozzle is generally difficult to be completed by one-step mould pressing forming, especially the slender nozzle with large length-diameter ratio, because there is no suitable core rod, so it is difficult to be completed by mould pressing forming, and it often needs to be processed by complex forming mode and then semi-processed, and if the special-shaped nozzle is complex, the semi-processing after traditional mould pressing forming cannot be realized.
[0004] In combination with the special inner hole structure of the hard alloy slender nozzle and cost economy, for the sintering of the hard alloy slender nozzle product with large length-diameter ratio, thin wall feature and special internal cavity shape, the prior art generally adopts cold isostatic pressing of the powder compact and then turning semi-processing, and finally high-temperature sintering forming.
[0005] In the cold isostatic pressing process, the prior art mainly adopts two-section core rods with opposite tapers to be connected, and this frock type has obvious defects: the split core rod cannot be locked and connected, under the pressure in the cold isostatic pressing process, it is easy to be misaligned, loose or deformed and damaged, and difficult to be demoulded, leading to poor forming precision of the inner hole of the product powder compact and difficult to ensure the product quality. CONTENT OF THE UTILITY MODEL
[0006] The utility model aims at providing a hard alloy slender nozzle's forming frock, and solves the technical problems that the split core rod of the prior art cannot be locked and connected, is easy to be misaligned and loose under the pressure in the cold isostatic pressing process, leads to poor forming precision of the inner hole of the product powder compact and is difficult to ensure the product quality.
[0007] To realize the above-mentioned purpose, the utility model provides a hard alloy slender nozzle's forming frock, which comprises:
[0008] A soft mould;
[0009] a core rod assembly arranged in the soft mold, the core rod assembly comprising an upper core rod and a lower core rod, one end of the upper core rod extending into an inner hole of the lower core rod, the upper core rod being provided with a first stepped portion, the first stepped portion abutting against an end surface of the lower core rod;
[0010] a fastener for fixing and connecting the upper core rod and the lower core rod;
[0011] an upper soft mold plug and a lower soft mold plug arranged at two ends of the soft mold respectively, wherein the upper soft mold plug is used for fixing the upper core rod and making the upper core rod concentric with the inner hole of the soft mold and sealing the soft mold, and the lower soft mold plug is used for fixing the lower core rod and making the lower core rod concentric with the inner hole of the soft mold and sealing the soft mold.
[0012] Preferably, the upper core rod comprises a first fixed section, a first acting section and a connecting section connected in sequence, the size of the first acting section gradually decreases from the first fixed section to the connecting section, the first stepped portion is located at the connection between the first acting section and the connecting section, and the connecting section of the upper core rod extends into the inner hole of the lower core rod.
[0013] Preferably, the lower core rod comprises a second fixed section and a second acting section connected in sequence, the connecting section of the upper core rod extends into the second acting section of the lower core rod, and the inner hole of the lower core rod penetrates through the second fixed section and the second acting section along the axial direction.
[0014] Preferably, the second fixed section of the lower core rod is provided with a connecting hole in the circumferential direction, the connecting hole is in communication with the inner hole of the lower core rod, the fastener is threadedly connected with the connecting hole, and one end of the fastener abuts against the upper core rod.
[0015] Preferably, one end of the lower core rod away from the upper core rod is connected with a sealing bolt, and the sealing bolt is used for closing the inner hole of the lower core rod.
[0016] Preferably, a core rod fixing ring provided with a through hole for filling powder into the inner hole of the soft mold is further included, the core rod fixing ring is further provided with a center hole, the center hole is arranged concentrically with the inner hole of the soft mold, when the powder is filled into the inner hole of the soft mold through the through hole, the first fixed section of the upper core rod is inserted into the center hole, so that the upper core rod is concentric with the inner hole of the soft mold.
[0017] Preferably, the hole diameter of one end of the soft mold is larger than that of the other end, the upper core rod and the upper soft mold plug are located at the end of the soft mold with smaller hole diameter, and the lower core rod and the lower soft mold plug are located at the end of the soft mold with larger hole diameter.
[0018] Preferably, the first fixed section of the upper core rod is inserted into the central inner hole of the upper soft mold plug, and the second fixed section of the lower core rod is inserted into the central inner hole of the lower soft mold plug.
[0019] Preferably, the upper sealing ring and the lower sealing ring are further provided, the upper sealing ring is arranged on the outer surface of the soft mold plug, and the lower sealing ring is arranged on the outer surface of the soft mold plug.
[0020] With respect to the background art, the forming tool for the hard alloy elongated nozzle provided by the utility model has the following advantages: one end of the upper core rod is inserted into the inner hole of the lower core rod, the first stepped portion of the upper core rod is abutted against the end face of the lower core rod, so that the upper core rod and the lower core rod are assembled in place, the upper core rod and the lower core rod are fixedly connected through the fastener after assembly, the upper core rod and the lower core rod are always connected under the action of pressure during the process of filling the powder and the cold isostatic pressing process, and the abutting precision is maintained, so that the upper core rod and the lower core rod will not be loose or deformed, the inner hole forming precision of the product powder compact is high, and the product quality can be ensured. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only the embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the provided drawings without paying creative labor.
[0022] Figure 1 The structural schematic diagram of the forming tool for the hard alloy elongated nozzle provided by the utility model embodiment;
[0023] Figure 2 The structural schematic diagram of the core rod assembly in the forming tool for the hard alloy elongated nozzle provided by the utility model embodiment;
[0024] Figure 3 The structural schematic diagram of the upper core rod in the core rod assembly provided by the utility model embodiment;
[0025] Figure 4 The structural schematic diagram of the lower core rod in the core rod assembly provided by the utility model embodiment;
[0026] Figure 5 The structural schematic diagram of the core rod fixing ring in the forming tool for the hard alloy elongated nozzle provided by the utility model embodiment;
[0027] Figure 6The structure schematic view of the other perspective of the core rod fixing ring in the forming tool of the hard alloy slender nozzle is provided in the embodiments of the present utility model.
[0028] Figure 7 The schematic view when the powder is filled is provided in the embodiments of the present utility model.
[0029] Figure 8 The schematic view when the filling is completed is provided in the embodiments of the present utility model.
[0030] Figure 9 The schematic view of the combination of the powder compact and the core rod assembly is provided in the embodiments of the present utility model.
[0031] Figure 10 The schematic view of the combination of the powder compact and the core rod assembly after the semi-processing is completed is provided in the embodiments of the present utility model.
[0032] Figure 11 The schematic view of the sintered hard alloy slender nozzle semi-finished product is provided in the embodiments of the present utility model.
[0033] Figure 12 The schematic view of the finished product of the hard alloy slender nozzle is provided in the embodiments of the present utility model.
[0034] Figures 1 to 12 Reference signs: 1, upper soft mold plug; 2, upper sealing ring; 3, soft mold; 4, powder compact; 5, core rod assembly; 51, upper core rod; 511, first fixed section; 512, first acting section; 513, connecting section; 514, first step part; 52, lower core rod; 521, second fixed section; 522, second acting section; 523, connecting hole; 53, fastener; 54, sealing bolt; 6, lower soft mold plug; 7, lower sealing ring; 8, core rod fixing ring; 81, center hole; 82, through hole. DETAILED DESCRIPTION
[0035] The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present utility model.
[0036] In order to make the person skilled in the art better understand the present utility model scheme, the present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.
[0037] The utility model provides a kind of hard alloy slender nozzle's forming tool, under the pressure action in filling powder process and cold isostatic pressing process, upper core rod 51 and lower core rod 52 are always connected, and keep the precision of butt joint, cannot produce loose, so that product powder compact 4 inner hole forming precision is high, ensure product quality.
[0038] Please refer to Figures 1 to 12 The utility model provides a kind of hard alloy slender nozzle's forming tool, including soft mould 3, core rod assembly 5, fastener 53, upper soft mould plug 1 and lower soft mould plug 6.
[0039] Soft mould 3 is a kind of mould type, usually made of high elasticity material, for example, silicone rubber, polyurethane etc.
[0040] Core rod assembly 5 is located in soft mould 3, and core rod assembly 5 includes upper core rod 51 and lower core rod 52, one end of upper core rod 51 is inserted into the inner hole of lower core rod 52, and upper core rod 51 is equipped with first step portion 514, and first step portion 514 is in abutment with the end face of lower core rod 52;Fastener 53 is used for fixedly connecting upper core rod 51 and lower core rod 52;Upper soft mould plug 1 and lower soft mould plug 6 are respectively arranged at both ends of soft mould 3, wherein, upper soft mould plug 1 is used for fixing upper core rod 51 and makes upper core rod 51 concentric with soft mould 3 and seals soft mould 3, and lower soft mould plug 6 is used for fixing lower core rod 52 and makes lower core rod 52 concentric with soft mould 3 and seals soft mould 3.Upper soft mould plug 1 makes upper core rod 51 concentric with the inner hole of soft mould 3, and lower soft mould plug 6 makes lower core rod 52 concentric with the inner hole of soft mould 3.
[0041] When using, one end of upper core rod 51 is inserted into the inner hole of lower core rod 52, so that first step portion 514 of upper core rod 51 is in abutment with the end face of lower core rod 52, and the abutment of first step portion 514 and the end face of lower core rod 52 ensures that upper core rod 51 and lower core rod 52 are installed in place, and play a positioning role, after the assembly of upper core rod 51 and lower core rod 52 is completed, upper core rod 51 and lower core rod 52 are fixedly connected by fastener 53, to avoid that upper core rod 51 and lower core rod 52 are loose in subsequent process, then core rod assembly 5 is placed into soft mould 3, and hard alloy mixed powder is filled into soft mould 3, and soft mould 3 is sealed by upper soft mould plug 1 and lower soft mould plug 6, finally, the assembled mould can be placed into cold isostatic pressing forming equipment for pressing.
[0042] The first step part 514 of the upper core rod 51 abuts against the end face of the lower core rod 52 to ensure that the upper core rod 51 and the lower core rod 52 are assembled in place, and after the assembly is completed, the upper core rod 51 and the lower core rod 52 are fixedly connected through the fastener 53. Through such a setting, the upper core rod 51 and the lower core rod 52 are always connected under the action of pressure in the process of filling the powder and the cold isostatic pressing process, and the butt joint precision is maintained, so that the upper core rod 51 and the lower core rod 52 will not be loose or deformed, the inner hole forming precision of the product powder compact 4 is high, and the product quality can be guaranteed.
[0043] Please refer to Figures 1 to 10 The upper core rod 51 comprises a first fixed section 511, a first acting section 512 and a connecting section 513 connected in sequence, the size of the first acting section 512 gradually decreases from the first fixed section 511 to the connecting section 513, the first step part 514 is located at the connection between the first acting section 512 and the connecting section 513, and the connecting section 513 of the upper core rod 51 extends into the inner hole of the lower core rod 52.
[0044] The upper core rod 51 is in an overall elongated conical structure, the first fixed section 511 is in a cylindrical shape, the first acting section 512 is in a conical shape, and the connecting section 513 is in a cylindrical shape, and the first acting section 512 is pressed in the cold isostatic pressing process.
[0045] Please refer to Figures 1 to 10 The connecting section 513 of the upper core rod 51 extends into the second acting section 522 of the lower core rod 52, and the inner hole of the lower core rod 52 penetrates through the second fixed section 521 and the second acting section 522 along the axial direction.
[0046] The lower core rod 52 is in a conical structure, the second fixed section 521 is in a cylindrical shape, the second acting section 522 is in a cylindrical shape near the second fixed section 521, and the part of the second acting section 522 away from the second fixed section 521 is in a conical shape, and the second acting section 522 is pressed in the cold isostatic pressing process.
[0047] After the assembly of the upper core rod 51 and the lower core rod 52 is completed, the connecting section 513 of the upper core rod 51 extends into the second acting section 522 of the lower core rod 52, the first step part 514 of the upper core rod 51 abuts against the end face of the lower core rod 52, the second acting section 522 of the lower core rod 52 is connected with the first acting section 512 of the upper core rod 51, and the first acting section 512 and the second acting section 522 are jointly pressed in the cold isostatic pressing process, so that the powder forming work is performed.
[0048] Please refer to Figures 1 to 10The second fixed section 521 of the lower core rod 52 is provided with a connecting hole 523 in the circumferential direction, the connecting hole 523 is communicated with the inner hole of the lower core rod 52, the fastener 53 is screwed with the connecting hole 523, and one end of the fastener 53 abuts against the upper core rod 51.
[0049] The connecting section 513 of the upper core rod 51 extends into the second acting section 522 of the lower core rod 52, so that the first step part 514 of the upper core rod 51 abuts against the end face of the lower core rod 52.
[0050] In addition, the connecting holes 523 are uniformly arranged in the axial direction, so that the load borne by each fastener 53 is relatively uniform, thereby improving the overall connection strength and ensuring the stability of the connection between the upper core rod 51 and the lower core rod 52.
[0051] Please refer to Figures 1 to 10 The end of the lower core rod 52, away from the upper core rod 51, is connected with a sealing bolt 54, which is used for sealing the inner hole of the lower core rod 52.
[0052] Please refer to Figures 5 to 7 The forming tool of the hard alloy elongated nozzle further comprises a core rod fixing ring 8 provided with a through hole 82, the through hole 82 is used for filling the powder into the soft mold 3, and the core rod fixing ring 8 is further provided with a center hole 81, the center hole 81 is concentrically arranged with the inner hole of the soft mold 3.
[0053] The core rod fixing ring 8 is used in the process of filling the powder, the fixed section of the upper core rod 51 is inserted into the center hole 81 of the core rod fixing ring 8, and since the center hole 81 is concentrically arranged with the inner hole of the soft mold 3, the core rod assembly 5 is located at the central position of the inner hole of the soft mold 3.
[0054] Please refer to Figures 1 to 10The soft mold 3 has one end with a larger aperture than the other end, the upper core rod 51 and the upper soft mold plug 1 are located at the end with the smaller aperture, and the lower core rod 52 and the lower soft mold plug 6 are located at the end with the larger aperture.
[0055] Please refer to Figures 1 to 10 The first fixed section 511 of the upper core rod 51 is inserted into the central inner hole of the upper soft mold plug 1, and the second fixed section 521 of the lower core rod 52 is inserted into the central inner hole of the lower soft mold plug 6. After the powder is filled, the first fixed section 511 of the upper core rod 51 is inserted into the inner hole of the upper soft mold plug 1, and the second fixed section 521 of the lower core rod 52 is inserted into the inner hole of the lower soft mold plug 6, so as to connect the upper core rod 51 and the lower core rod 52 with the upper soft mold plug 1 and the lower soft mold plug 6 respectively, and then the pressing can be performed in the cold isostatic pressing forming equipment.
[0056] In addition, the inner holes of the upper soft mold plug 1 and the lower soft mold plug 6 are concentrically arranged with the inner hole of the soft mold 3, so that the upper soft mold plug 1 keeps the upper core rod 51 concentric with the inner hole of the soft mold 3, and the lower soft mold plug 6 keeps the lower core rod 52 concentric with the inner hole of the soft mold 3.
[0057] Please refer to Figures 1 to 10 The forming tool for the hard alloy elongated nozzle provided by the utility model further comprises an upper sealing ring 2 and a lower sealing ring 7 which are sleeved and fixed outside the soft mold 3, the upper sealing ring 2 is used for forming a seal between the inner hole of the upper soft mold plug 1 and the first fixed section 511 of the upper core rod 51, and the lower sealing ring 7 is used for forming a seal between the inner hole of the lower soft mold plug 6 and the second fixed section 521 of the lower core rod 52.
[0058] After the powder is filled, the upper core rod 51 and the lower core rod 52 are connected with the upper soft mold plug 1 and the lower soft mold plug 6 respectively, the upper sealing ring 2 and the lower sealing ring 7 are sleeved outside the soft mold 3, wherein the upper sealing ring 2 is located at one end of the soft mold 3 where the upper soft mold plug 1 is arranged, a pressure is applied through the upper sealing ring 2 to make the soft mold 3 and the upper soft mold plug 1 shrink under stress, so that a seal is formed between the inner hole of the upper soft mold plug 1 and the upper core rod 51, and the hydraulic oil is prevented from seeping in; the lower sealing ring 7 is located at one end of the soft mold 3 where the lower soft mold plug 6 is arranged, a pressure is applied through the lower sealing ring 7 to make the soft mold 3 and the lower soft mold plug 6 shrink under stress, so that a seal is formed between the inner hole of the lower soft mold plug 6 and the lower core rod 52, and the hydraulic oil is also prevented from seeping in.
[0059] Please refer to Figures 1 to 12 The specific assembly process and use process of the forming tool for the hard alloy elongated nozzle provided by the utility model are as follows:
[0060] 1, The upper core rod 51 is vertically placed on the table, the connecting section 513 is upward, the connecting section 513 of the upper core rod 51 is inserted into the second acting section 522 of the lower core rod 52, the first step part 514 of the upper core rod 51 is abutted with the end face of the lower core rod 52, the upper core rod 51 and the lower core rod 52 are fixedly connected through the fastener 53, the powder compact 4 inner hole forming defects caused by loosening in the pressing process are prevented, the sealing bolt 54 is installed into the tail of the lower core rod 52, the hydraulic oil is prevented from seeping into the inside of the lower core rod 52 to pollute the powder in the pressing process, and the core rod assembly 5 is assembled;
[0061] 2, The lower soft mold plug 6 is installed into the tail of the lower core rod 52, and then is placed along the larger one end of the soft mold 3 hole diameter, the lower soft mold plug 6 is matched with the soft mold 3 inner hole to the position;
[0062] 3, The core rod fixing ring 8 is sleeved on the upper core rod 51, the core rod assembly 5 is prevented from eccentricity in the powder loading process, and the coaxiality of the core rod assembly 5 and the soft mold 3 inner hole is ensured;
[0063] 4, The lower sealing ring 7 is locked, the hydraulic oil is prevented from seeping into the mold inside to pollute the powder compact 4 in the pressing process;
[0064] 5, The mixed powder is loaded into the gap between the soft mold 3 inner hole and the core rod assembly 5 from the two through holes 82 of the core rod fixing ring 8, and is uniformly filled;
[0065] 6, The core rod fixing ring 8 is taken out, the upper soft mold plug 1 is installed, the upper soft mold plug 1 is matched with the soft mold 3 inner hole to the position, the upper sealing ring 2 is locked, and the hydraulic oil is prevented from seeping into the mold inside;
[0066] 7, The assembled mold assembly is placed into the cold isostatic pressing forming equipment for pressing;
[0067] 8, After the pressing is completed, the oil stains on the surface are wiped off, the upper sealing ring 2 and the lower sealing ring 7 are respectively loosened, the upper soft mold plug 1 and the lower soft mold plug 6 are pulled out, and the combination of the powder compact 4 and the core rod assembly 5 is poured out;
[0068] 9, The tool clamp is designed according to the product characteristics, the core rod assembly 5 is clamped and corrected, the nozzle semi-finished product shape required by the drawing is processed by using the numerical control lathe, the damage of the clamp clamping force to the powder compact 4 is avoided, and the core rod assembly 5 placed in the powder compact 4 inner hole improves the powder compact 4 stiffness and is not easy to break in the cutting process and the handling process;
[0069] 10, Two fixing bolts are loosened, the lower core rod 52 and the upper core rod 51 are sequentially pulled out, the demolding is completed, the powder compact 4 semi-finished product is placed into the high-temperature sintering furnace for sintering, and after the sintered semi-finished product is qualified, the outer circle and the end face are finely ground according to the drawing requirements, and the processing reaches the required size.
[0070] The upper core rod 51 and the lower core rod 52 are fixedly connected through the fastener 53, and the upper core rod 51 and the lower core rod 52 are always connected and the butt joint precision is kept under the pressure action in the powder filling process and the cold isostatic pressing process, so that the upper core rod 51 and the lower core rod 52 will not be loose or deformed; in the powder filling process, the fixed section of the upper core rod 51 is inserted into the center hole 81 of the core rod fixing ring 8, and since the center hole 81 is concentrically arranged with the inner hole of the soft mold 3, the core rod assembly 5 is located at the center position of the inner hole of the soft mold 3, when the powder is filled into the inner hole of the soft mold 3 through the through hole 82, the powder is uniformly distributed, the inner hole forming precision of the product powder compact 4 is high, and the product quality can be guaranteed.
[0071] It should be noted that the relative terms, such as first and second, in the present description are used only to differentiate one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities.
[0072] The principles and implementation modes of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the present application.
Claims
1. A forming tooling for a slender, carbide nozzle, characterized in that, include: Soft mold; A core rod assembly is disposed within the soft mold. The core rod assembly includes an upper core rod and a lower core rod. One end of the upper core rod extends into the inner hole of the lower core rod. The upper core rod is provided with a first stepped portion, which abuts against the end face of the lower core rod. Fasteners are used to securely connect the upper core rod and the lower core rod. An upper soft mold plug and a lower soft mold plug are respectively disposed at both ends of the soft mold. The upper soft mold plug is used to fix the upper core rod and make the upper core rod concentric with the inner hole of the soft mold and to seal the soft mold. The lower soft mold plug is used to fix the lower core rod and make the lower core rod concentric with the inner hole of the soft mold and to seal the soft mold. The upper core rod includes a first fixed section, a first functional section, and a connecting section connected in sequence. The lower core rod includes a second fixed section and a second functional section connected in sequence; the second fixed section of the lower core rod is provided with a connecting hole along the circumferential direction, the connecting hole communicates with the inner hole of the lower core rod, the fastener is threadedly connected to the connecting hole, and one end of the fastener abuts against the upper core rod; It also includes a core rod fixing ring with a through hole for filling powder into the soft mold. The core rod fixing ring also has a central hole, which is concentric with the inner hole of the soft mold. When filling powder into the inner hole of the soft mold through the through hole, the first fixing section of the upper core rod is inserted into the central hole, thereby making the upper core rod concentric with the inner hole of the soft mold.
2. The forming tooling for the slender cemented carbide nozzle according to claim 1, characterized in that, The size of the first functional section gradually decreases from the first fixed section to the connecting section. The first stepped portion is located at the connection between the first functional section and the connecting section. The connecting section of the upper core rod extends into the inner hole of the lower core rod.
3. The forming tooling for the slender cemented carbide nozzle according to claim 2, characterized in that, The connecting section of the upper core rod extends into the second working section of the lower core rod, and the inner hole of the lower core rod passes through the second fixing section and the second working section along the axial direction.
4. The forming tooling for the slender cemented carbide nozzle according to claim 1, characterized in that, A sealing bolt is connected to the end of the lower core rod that is away from the upper core rod. The sealing bolt is used to seal the inner hole of the lower core rod.
5. The forming tooling for the slender cemented carbide nozzle according to claim 3, characterized in that, The aperture of one end of the soft mold is larger than that of the other end. The upper core rod and the upper soft mold plug are located at the end with the smaller aperture of the soft mold, and the lower core rod and the lower soft mold plug are located at the end with the larger aperture of the soft mold.
6. The forming tooling for the slender cemented carbide nozzle according to claim 5, characterized in that, The first fixing section of the upper core rod is inserted into the central inner hole of the upper soft mold plug, and the second fixing section of the lower core rod is inserted into the central inner hole of the lower soft mold plug.
7. The forming tooling for the slender cemented carbide nozzle according to claim 6, characterized in that, It also includes an upper sealing ring and a lower sealing ring sleeved on the soft mold. The upper sealing ring is used to form a seal between the inner hole of the upper soft mold plug and the first fixed section of the upper core rod, and the lower sealing ring is used to form a seal between the inner hole of the lower soft mold plug and the second fixed section of the lower core rod.