An outer thread integrated forming die for a pipe joint

Abstract

The application discloses a pipe joint outer thread integrated forming die, which comprises a fixed die base, a fixed die plate, a movable die plate and a movable die base; the fixed die base is used for fixing the fixed die plate; the movable die base is used for fixing the movable die plate; a forming cavity is arranged between the fixed die plate and the movable die plate; a plurality of screw thread split inserts for forming outer threads are arranged in the forming cavity; the plurality of screw thread split inserts are orderly distributed according to the shape of a pipe joint product; compared with a traditional bar machining process, the pipe joint outer thread formed by using the die can save 15% of cost; the internal process efficiency is improved by 10%, the production cycle is greatly shortened, the market demand can be quickly responded, and the production benefit of an enterprise is improved; after sintering treatment of the formed thread, the related dimensions can meet the use requirements of customers, the high-precision design and processing of the die and the optimization of the clamping line and deformation treatment ensure that the quality of the pipe joint thread is stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of mold-related technology, specifically to an integral forming mold for external threads of pipe fittings. Background Technology

[0002] In the field of traditional pipe fitting external thread processing, bar turning is the main process. This processing method is not only difficult to process, requiring professional lathe equipment and skilled operators, but also generates a large amount of material waste during the process, resulting in high production costs. In addition, the production efficiency of traditional processes is low, making it difficult to meet the growing market demand. With the continuous improvement of the manufacturing industry's requirements for production efficiency, cost control and product quality, it is urgent to develop a new type of one-piece molding die for pipe fittings.

[0003] Based on the above, after thorough comparison and demonstration, our company carried out corresponding technical modifications and developed an integrated molding die for the external thread of a pipe fitting. Utility Model Content

[0004] The purpose of this utility model is to provide a pipe fitting external thread integral forming mold that can directly form various non-standard external straight threads and tapered pipe threads for pipe fittings, overcoming the shortcomings of traditional processing technology and achieving efficient, low-cost, and high-quality production.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: an integral forming mold for external threads of pipe joints, comprising a fixed mold base, a fixed template, a movable template, and a movable mold base;

[0006] The fixed mold base is used to fix the fixed mold plate;

[0007] The movable mold base is used to fix the movable mold plate;

[0008] A forming cavity is provided between the fixed template and the moving template;

[0009] The forming cavity is provided with multiple threaded inserts for forming external threads;

[0010] Multiple threaded inserts are arranged in an orderly manner according to the shape of the pipe fitting product.

[0011] In a preferred embodiment, the non-standard external straight thread specifications for the threaded split insert include M6×0.75, M8×0.75, M10×1, M11×1, M12×1, M13×1, M14×1, M15×1, M16×1, and M19×1, and the tapered pipe thread specifications include R1 / 8, R1 / 4, R3 / 8, and R1 / 2.

[0012] In a preferred embodiment, the parting line of the threaded split insert is precisely fitted, and the gap at the parting line is controlled to be less than or equal to 0.05 mm through high-precision machining and assembly, and the surface roughness Ra of the thread does not exceed 0.8 μm.

[0013] In a preferred embodiment, the fixed mold base and the moving mold base are respectively provided with positioning holes and positioning pins. The diameter tolerance of the positioning hole is controlled within H7, the diameter tolerance of the positioning pin is controlled within g6, and the clearance between the positioning hole and the positioning pin is 0.01-0.03mm.

[0014] In a preferred embodiment, the threaded split insert is made of Cr12MoV mold steel, and its surface is nitrided to form a nitrided layer with a thickness of 0.2-0.3 mm and a surface hardness of HV800-1000.

[0015] In a preferred embodiment, the moving template is further provided with an ejection device.

[0016] Due to the application of the above technical solution, the beneficial effects of this application compared with the prior art are as follows:

[0017] This application discloses an integrated molding die for forming external threads on pipe fittings. Compared to traditional bar machining processes, using this die to form external threads on pipe fittings can save 15% of the cost. This is mainly due to the elimination of the thread turning process, which reduces material waste and processing costs. Internal process efficiency is improved by 10%, and the integrated molding process of the die greatly shortens the production cycle, enabling rapid response to market demands and improving the company's production efficiency. After sintering, the dimensions of the formed thread meet the customer's requirements. The high-precision design and machining of the die, as well as the optimization of the parting line and deformation treatment, ensure the stable and reliable quality of the pipe fitting threads. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Appendix Figure 1 This is a schematic diagram of the structure of the pipe fitting external thread integral molding mold of this utility model;

[0020] Appendix Figure 2 This is an internal schematic diagram of the integral molding mold for the external thread of the pipe fitting of this utility model.

[0021] The components include: 1. Fixed mold base; 2. Fixed template; 3. Moving template; 4. Moving mold base; 5. Forming cavity; 6. Threaded split insert. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0025] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0026] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] Example 1

[0029] Appendix Figure 1 and 2 The present invention provides a pipe fitting external thread integral forming mold, comprising a fixed mold base 1, a fixed template 2, a movable template 4, and a movable mold base 3;

[0030] The fixed mold base 1 is used to fix the fixed mold plate 2;

[0031] The moving mold base 3 is used to fix the moving mold plate 4;

[0032] A forming cavity 5 is provided between the fixed template 2 and the moving template 4;

[0033] The forming cavity 5 is provided with a plurality of threaded inserts 6 for forming external threads;

[0034] The multiple threaded split inserts 6 are arranged in an orderly manner according to the shape of the pipe fitting product.

[0035] The threaded insert 6 is used to form non-standard external straight thread specifications including M6×0.75, M8×0.75, M10×1, M11×1, M12×1, M13×1, M14×1, M15×1, M16×1, and M19×1, and tapered pipe thread specifications including R1 / 8, R1 / 4, R3 / 8, and R1 / 2. For M6×0.75 threads, the pitch accuracy of the threaded insert 6 is controlled within ±0.01mm, and the thread profile half-angle error is controlled within ±5′. For M8×0.75 threads, the pitch accuracy is controlled within ±0.012mm, and the thread profile half-angle error is controlled within ±6′. For other thread specifications, the shape, size, and thread parameters of the threaded insert 6 are precisely designed according to the corresponding accuracy level to ensure that the formed threads meet the accuracy requirements.

[0036] The parting line of the threaded split insert 6 is precisely fitted, and the gap at the parting line is controlled to be less than or equal to 0.05mm through high-precision machining and assembly. It is inspected using optical inspection equipment to avoid burrs or defects on the threaded surface of the pipe joint, and to ensure that the surface roughness Ra of the thread does not exceed 0.8μm.

[0037] The fixed mold base 1 and the moving mold base 3 are respectively provided with positioning holes and positioning pins. The diameter tolerance of the positioning hole is controlled within H7, and the diameter tolerance of the positioning pin is controlled within g6. The clearance between the positioning hole and the positioning pin is 0.01-0.03mm. This is used to ensure accurate alignment between the fixed mold base 1 plate, the fixed template 2, the moving template 4 and the moving mold base 3 plate when the mold is closed. After the mold is closed, the dimensional deviation of the mold cavity does not exceed ±0.05mm.

[0038] The threaded split insert 6 is made of Cr12MoV mold steel, and its surface is nitrided to form a nitrided layer with a thickness of 0.2-0.3mm and a surface hardness of HV800-1000, in order to improve the service life of the insert and the quality of the formed thread. The wear of the insert under normal use conditions does not exceed 0.02mm per year.

[0039] The moving template 4 is also equipped with an ejection device; the ejection device includes ejector pins and ejector pin fixing plates. The ejector pins are made of SKD61 material with a diameter of 3-5mm. The number of ejector pins is determined according to the weight and structure of the pipe fitting product. For pipe fitting products weighing 50-100g, 2-3 ejector pins are distributed per square centimeter. One end of the ejector pin is connected to the ejector pin fixing plate, and the other end is used to eject the formed pipe fitting product. The thickness of the ejector pin fixing plate is 20-30mm to ensure the stability of the ejection process.

[0040] In practical use, the following steps are included:

[0041] Mold installation and debugging: Install the fixed mold base 1 and the moving mold base 3 on the fixed platen 2 and the moving platen 4 of the injection molding machine, respectively. Connect the mold cooling system and the ejection system. Install the threaded split insert 6 and carefully adjust the position and fit accuracy of the insert to ensure that the parting line fits tightly. Inspect and debug the injection system to ensure that the gate and runner are unobstructed.

[0042] Production process

[0043] Injection molding stage: Plastic raw materials are added to the injection molding machine barrel, heated and melted, and then injected into the mold cavity through the screw of the injection molding machine. During the injection process, parameters such as injection pressure, speed and temperature are strictly controlled to ensure that the plastic melt is evenly filled into the thread forming area.

[0044] Pressure holding and cooling: After injection molding, the mold is held under pressure to ensure that the plastic is fully formed under pressure, thus avoiding shrinkage defects. At the same time, the mold is cooled by the mold cooling system to accelerate the solidification of the product.

[0045] Demolding stage: After the product cools to a certain degree, the moving platen 4 of the injection molding machine retracts, opens the mold, and ejects the formed pipe fitting product from the mold through the ejection system.

[0046] Subsequent processing: After demolding, the pipe fitting products undergo sintering to improve their strength and stability. To address potential deformation after sintering, mechanical shaping is performed in the shaping area, avoiding the threaded areas. After shaping, the products undergo quality inspection, and qualified products are packaged and stored.

[0047] This application discloses an integrated molding die for forming external threads on pipe fittings. Compared to traditional bar machining processes, using this die to form external threads on pipe fittings can save 15% of the cost. This is mainly due to the elimination of the thread turning process, which reduces material waste and processing costs. Internal process efficiency is improved by 10%, and the integrated molding process of the die greatly shortens the production cycle, enabling rapid response to market demands and improving the company's production efficiency. After sintering, the dimensions of the formed thread meet the customer's requirements. The high-precision design and machining of the die, as well as the optimization of the parting line and deformation treatment, ensure the stable and reliable quality of the pipe fitting threads.

[0048] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mold for integrally forming the external thread of a pipe fitting, characterized in that: Includes fixed mold base, fixed template, moving template, and moving mold base; The fixed mold base is used to fix the fixed mold plate; The movable mold base is used to fix the movable mold plate; A forming cavity is provided between the fixed template and the moving template; The forming cavity is provided with multiple threaded inserts for forming external threads; Multiple threaded inserts are arranged in an orderly manner according to the shape of the pipe fitting product.

2. The pipe fitting external thread integral forming mold as described in claim 1, characterized in that: The non-standard external straight thread specifications for the threaded split inserts include M6×0.75, M8×0.75, M10×1, M11×1, M12×1, M13×1, M14×1, M15×1, M16×1, and M19×1, while the tapered pipe thread specifications include R1 / 8, R1 / 4, R3 / 8, and R1 / 2.

3. The pipe fitting external thread integral forming mold as described in claim 1, characterized in that: The parting line of the threaded split insert is precisely matched, and the gap at the parting line is controlled to be less than or equal to 0.05 mm through high-precision machining and assembly. The surface roughness Ra of the thread does not exceed 0.8 μm.

4. The integral forming mold for the external thread of a pipe fitting as described in claim 1, characterized in that: The fixed mold base and the moving mold base are respectively provided with positioning holes and positioning pins. The diameter tolerance of the positioning hole is controlled within H7, the diameter tolerance of the positioning pin is controlled within g6, and the clearance between the positioning hole and the positioning pin is 0.01-0.03mm.

5. The pipe fitting external thread integral forming mold as described in claim 1, characterized in that: The threaded split insert is made of Cr12MoV mold steel, and its surface is nitrided to form a nitrided layer with a thickness of 0.2-0.3mm and a surface hardness of HV800-1000.

6. The pipe fitting external thread integral forming mold as described in claim 1, characterized in that: The moving template is also equipped with an ejection device.

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