Machining and forming method of compression-resisting leakproof shedding preventing pipeline joint

[0015] Hereinafter, the features of the present invention and other related features will be further described in detail through embodiments in conjunction with the accompanying drawings, so as to facilitate the understanding of those skilled in the industry:

[0016] Attached Figure 1-5 The Chinese numbers 1-8 represent the annular groove 1, the internal thread 2, the pipe 3, the outer wall of the pipe 4, the annular boss 5, the fan-shaped groove 6, the injection molding material 7, and the internal thread elbow 8.

[0017] In this embodiment, a method for processing and forming an internally threaded elbow of a pressure-resistant, leak-proof, and anti-dropping pipe joint is taken as an example. figure 1 Shown is the outline diagram of the internal threaded elbow. From figure 1 It can be seen that the internal threaded elbow 8 is embedded with a metal pipe connector, and the outside of the metal pipe connector is combined with the elbow through injection molding to form an integrated structure, and the metal pipe connector has a thread 2 inside. Attached figure 2 It is the main sectional view of the prior art metal pipe connector. by Figure 1-2 It can be seen that the metal pipe connector in this embodiment is mainly composed of a pipe 3, an internal thread 2, a pipe outer wall 4, and a sector-shaped slot 6. The pipe outer wall 4 is provided with an annular slot 1, and the metal pipe connector is machined in advance before injection molding. , And then use metal pipe connectors as core injection molding to form figure 1 Female threaded elbow shown.

[0018] Such as figure 2 As shown, in the prior art, when machining metal pipe connectors, grooves with a certain degree of inclination are often machined in the process slot (annular slot 1), for example, the side wall of the annular slot 1 is formed with a 51-degree slope. Groove, this can basically meet the requirements of pressure resistance and leakage under normal circumstances. However, during injection molding, the fastness between the metal and the injection molding material is not enough because the metal and the injection molding material 7 are prone to bubbles, and it is also easy to cause water When the pressure is higher, the water leakage between the gaps and the appearance miniature phenomenon. Attached image 3 This is the main cross-sectional view of the metal pipe connector of the present invention. In the processing and forming process of this embodiment, a groove inclined to a certain degree in the groove is improved, and the side wall of the annular groove 1 is processed as follows: image 3 The semicircular concave groove shown. After repeated experiments, after changing the side wall of the annular groove 1 to a semicircular concave shape, the injection flow rate in the later injection molding process will increase by more than 20%, which improves the productivity. It also corrects the original disadvantage that the metal and the injection molding material 7 are prone to air bubbles during injection molding, so that the metal pipe connector and the injection molding material 7 are more closely combined, thereby improving the fastness between the metal and the injection molding.

[0019] At the same time, in this embodiment, before injection molding, a ring-shaped boss 5 is reserved and processed on the outer edge of the bottom end of the pipe. The ring-shaped boss 5 and the pipe connector have an integrated structure, that is, the image 3 The height of the metal part of the outer wall on the outer edge of the right bottom end of the pipe connection shown in the figure is to enhance the compression resistance of the metal pipe connection, so that the metal pipe connection is not easy to crack under the impact of high-pressure water, and improve the quality of the pipe joint (metal ratio The injection molding is strong and durable); the raised part, namely the annular boss 5, is also processed with arc-shaped grooves, namely image 3 The semi-circular groove on the left side of the middle ring boss 5 can also avoid the disadvantages of bubbles arising from the contact between metal and injection during injection molding, improve the tight bonding between the metal and the injection molding material 7, and improve the relationship between the metal and the injection molding. Fastness between.

[0020] Figure 4 The top view of the prior art metal pipe connector; Figure 4 It can be seen that the top end of the pipe connector in the existing pipe interface is generally provided with three or more fan-shaped slots 6 to increase the combined area and force support of the metal pipe connector and the injection molding material 7, but Figure 4 The metal width and thickness of the support of the middle fan-shaped slot 6 are small, and it is easy to break under the action of high-pressure water flow. The space for injection molding in the fan-shaped slot 6 is small, which makes the connection performance between metal and injection molding poor.

[0021] Figure 5 This is the top view of the pipe connector in the present invention. In this embodiment, the fan-shaped slot 6 is changed from three to two, so that the force is symmetrically and uniformly, and during processing, the space occupied by the fan-shaped slot 6 and the width and thickness of the supporting metal are increased as much as possible, so that the fan-shaped card The slot 6 has an increased space for injection molding, which greatly increases its connectivity, and also increases the fastness between metal and injection molding. The width and thickness of the supporting metal of the sector-shaped slot 6 are increased, which improves the quality of the pipe connector (Metal is stronger and more durable than injection molded), making it harder to crack when impacted or leaked.

[0022] In addition, in applications where the water pressure is relatively strong, due to the small width of the metal in the process, it is easy to break under the action of the water pressure. For this reason, the metal width of the pipe outer wall 4 can be increased, that is, the amount of machining and turning is reduced, and the meat is increased. Thick, it is not easy to break under the action of water flow pressure, which enhances durability. Finally, after the machining is completed, the processed metal pipe connector is used as a mold core to perform injection molding, which can be shaped into a high-quality pipe joint with high compression resistance, leakage prevention and anti-dropping. By adopting the processing and molding method of the present invention, the production efficiency of the product is improved, the tight combination and the firmness of the pipe connector of the molded part and the external injection material are greatly improved, and the quality of the pipe joint is improved.