Electromagnetic welding induction insert mold

Abstract

The utility model discloses an electromagnetic welding induction insert mold. The problem that after injection molding of an existing electromagnetic induction insert, the inner edge face is directly exposed in air, and consequently the connecting strength of a pipe fitting and a pipe is affected is solved. The male die and the female die are correspondingly and movably embedded; a core column with the diameter smaller than that of the inner edge of the electromagnetic welding induction insert is arranged on the corresponding end face of the male die, a plurality of inner edge protruding edges with the outer edge faces used for being correspondingly attached to the inner edge face of the electromagnetic welding induction insert are arranged on the side face of the core column in a circumferential array mode, and a cavity groove with the diameter larger than that of the outer edge of the electromagnetic welding induction insert is formed in the corresponding end face of the female die. A plurality of outer edge protruding edges used for being correspondingly attached to the outer edge face of the electromagnetic welding induction insert are arranged on the groove wall of the cavity groove in a circumferential array mode, and the inner edge protruding edges correspond to the outer edge protruding edges in a one-to-one mode. Pre-injection molding of the electromagnetic welding induction insert is conducted through the mold, the inner sealing piece is formed at the inner edge of the electromagnetic welding induction insert, and therefore it is guaranteed that the electromagnetic welding induction insert can be completely wrapped in the end of the pipe fitting during injection molding of the pipe fitting.

Description

Technical Field

[0001] This application relates to the field of injection molds, and more particularly to an electromagnetic welding induction insert mold. Background Art

[0002] Electromagnetic welding is a technology that uses the principle of electromagnetic induction for heating and achieving welding. Its basic principle is to utilize the magnetic permeability of the intermediate layer of the pipe fitting. When the excitation coil of the electromagnetic inductor surrounds the pipe fitting, turning on the power supply will generate magnetic lines of force that change at high speed. When these magnetic lines of force pass through the metal material of the intermediate layer, a magnetothermal conversion effect will occur, causing the steel material to heat up. With the conduction of heat, the inner and outer layers of plastic of the pipe or pipe fitting, as well as the plastic that fits therewith, will gradually melt, ultimately achieving a perfect fusion of the materials.

[0003] The pipe fitting needs to be injection-molded through an injection mold. In order to enable an electromagnetic induction insert that generates electromagnetic induction to be embedded at the end of the pipe fitting to achieve electromagnetic welding, before the pipe fitting is injection-molded, the electromagnetic welding induction insert needs to be sleeved at the mold core rod used to form the inner edge contour of the pipe fitting. However, after the pipe fitting is cast and formed, due to the tight contact between the electromagnetic induction insert and the core rod, the material cannot be injected between the electromagnetic induction insert and the core rod. After demolding, the electromagnetic induction insert is directly exposed at the inner edge surface of the pipe fitting, and the electromagnetic induction insert made of metal material is extremely prone to oxidation after contacting with air, affecting the connection strength between the pipe fitting and the pipe during electromagnetic welding.

[0004] The information disclosed in this background art section is only used to deepen the understanding of the background art of the present disclosure, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] In view of at least one of the above technical problems, the present disclosure provides an electromagnetic welding induction insert mold, aiming to solve the problem that the inner edge surface is directly exposed to the air after injection molding of the existing electromagnetic induction insert, which affects the connection strength between the pipe fitting and the pipe.

[0006] According to one aspect of the present disclosure, there is provided an electromagnetic welding induction insert mold, which includes a male mold and a female mold that are movably and fittingly engaged with each other; a core column with a diameter smaller than the inner diameter of the electromagnetic welding induction insert is provided on the corresponding end surface of the male mold, and a plurality of inner edge convex ribs with outer edge surfaces for correspondingly fitting with the inner edge surface of the electromagnetic welding induction insert are circumferentially arranged on the side surface of the core column. A cavity groove with a diameter larger than the outer diameter of the electromagnetic welding induction insert is provided on the corresponding end surface of the female mold, and a plurality of outer edge convex ribs for correspondingly fitting with the outer edge surface of the electromagnetic welding induction insert are circumferentially arranged on the groove wall of the cavity groove, and the inner edge convex ribs and the outer edge convex ribs correspond to each other one by one.

[0007] In some embodiments of the present disclosure, the height of the core column and the depth of the cavity groove respectively match the height of the electromagnetic welding induction insert.

[0008] In some embodiments of the present disclosure, a feed pipe hole is provided at the center of the cavity groove, and each material guiding groove corresponding to the feed pipe hole is provided on the end face of the core column. The ends of the material guiding grooves respectively communicate with the spaces between adjacent inner edge ribs.

[0009] In some embodiments of the present disclosure, shoulders are provided between adjacent inner edge ribs at the bottom of the core column, and the outer contour of the shoulders matches the inner contour of the electromagnetic welding induction insert.

[0010] In some embodiments of the present disclosure, guiding columns are respectively provided at the four corners of the punch, and guiding grooves matching the guiding columns are respectively provided at the four corners of the die.

[0011] In some embodiments of the present disclosure, the punch includes an end plate with the core column provided on one side, and a fixed seat provided on the other side of the end plate for corresponding connection with an injection molding machine.

[0012] In some embodiments of the present disclosure, an activity cavity is provided between the fixed seat and the end plate, and an activity plate moving along the axial direction of the core column is provided in the activity cavity; a plurality of sliding grooves are provided along the circumference of the core column edge at the end plate, and ejector rods fixedly connected with the sliding plate are slidably embedded in the sliding grooves.

[0013] In some embodiments of the present disclosure, the inner edge surface contour of the ejector rod close to the core column matches the outer edge surface contour of the inner edge rib.

[0014] In some embodiments of the present disclosure, a return spring is provided between the activity plate and the end plate, and a push hole for pushing the activity plate is provided at the end face of the fixed seat.

[0015] One or more technical solutions provided in the embodiments of the present application have at least any one of the following technical effects or advantages:

[0016] 1. The reliable positioning of the electromagnetic welding induction insert is realized through the inner edge ribs arranged on the outer circumference of the core column, and an injection molding cavity is formed between adjacent inner edge ribs, so that a plurality of inner covers are injection molded on the inner edge of the electromagnetic welding induction insert. Thus, when the electromagnetic welding induction insert is sleeved on the core rod during the injection molding of the pipe fitting, there is an injection molding gap between the inner edge of the electromagnetic welding induction insert and the core rod, so as to ensure that after the pipe fitting is injection molded, the electromagnetic welding induction insert is completely covered in the end of the pipe fitting, avoiding contact with air and affecting the welding strength.

[0017] 2. Through the ejector rods moving with the activity plate, the automatic demolding of the electromagnetic welding induction insert after injection molding can be realized, thus avoiding problems such as the risk of scalding and low demolding efficiency in manual demolding, and improving the pre-injection molding efficiency of the electromagnetic welding induction insert. Description of the Drawings

[0018] Figure 1 This is a schematic structural diagram of a punch in an embodiment of the present application.

[0019] Figure 2 This is a schematic structural diagram of a die in an embodiment of the present application.

[0020] Figure 3 This is an exploded schematic diagram of the cooperation between the punch and the die in an embodiment of the present application.

[0021] Figure 4 This is a schematic structural diagram of an end plate in an embodiment of the present application.

[0022] Figure 5 This is a schematic structural diagram of a movable plate in an embodiment of the present application.

[0023] In the above figures, 1 is the core column, 2 is the inner edge convex rib, 3 is the cavity groove, 4 is the outer edge convex rib, 5 is the feed pipe hole, 6 is the material guiding groove, 7 is the shoulder, 8 is the guiding column, 9 is the guiding groove, 10 is the die, 11 is the punch, 12 is the electromagnetic welding induction insert, 13 is the end plate, 14 is the fixed seat, 15 is the movable plate, 16 is the sliding groove, 17 is the ejector rod, 18 is the limiting column, and 19 is the return spring. Detailed implementation manners

[0024] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0025] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0026] To solve the problem that when the existing electromagnetic welding induction insert is correspondingly injection-molded at the end of the pipe fitting and directly sleeved on the injection-molding core rod, after the pipe fitting is injection-molded, its inner edge contour is directly exposed and in contact with air, which is likely to cause oxidation and affect the subsequent welding strength. In this example, an electromagnetic welding induction insert mold is disclosed. By pre-injecting the electromagnetic welding induction insert, after the pre-injected electromagnetic welding induction insert is correspondingly sleeved on the injection-molding core rod of the pipe fitting, there is an injection space between the core rod and the electromagnetic welding induction insert. Thus, after the pipe fitting is formed, the electromagnetic welding induction insert can be completely coated inside the end of the pipe fitting.

[0027] Specifically, considering that when the traditional electromagnetic welding induction insert is injection-molded at the end of the pipe fitting, the reason for the exposure of the inner edge surface of the electromagnetic welding induction insert is that during injection molding, the electromagnetic welding induction insert cannot be concentrically suspended outside the mandrel, and it can only be directly sleeved at the mandrel of the pipe fitting mold, resulting in no injection gap between the electromagnetic welding induction insert and the mandrel, thus causing the problem of the exposure of the inner edge surface of the electromagnetic welded pipe fitting after forming. Therefore, in this embodiment, several inner sealing pieces with a certain thickness are pre-injection-molded at the inner edge surface of the electromagnetic welding induction insert through the electromagnetic welding induction insert mold. After the electromagnetic welding induction insert is correspondingly sleeved at the mandrel, due to the thickness of the inner sealing piece, there is an injection gap between the inner edge of the electromagnetic welding induction insert and the mandrel, so that the electromagnetic welding induction insert can be completely wrapped in the end of the pipe fitting after the pipe fitting is injection-molded.

[0028] In this embodiment, the electromagnetic welding induction insert mold includes a male mold and a female mold that are mutually matched and can be movably fitted. See Figure 1 , at the center position of the end face of the male mold, there is a core column 1, and the height of the core column 1 is the same as the height of the electromagnetic welding induction insert, so that the electromagnetic welding induction insert can be sleeved outside the core column 1. However, in order to pre-injection-mold several inner sealing pieces at the inner edge surface of the electromagnetic welding induction insert, see Figure 1 , several inner edge ridges 2 are circumferentially arrayed on the side surface of the core column 1, and the outer edge surface of each inner edge ridge 2 is matched with the inner edge surface of the electromagnetic welding induction insert, so that the electromagnetic welding induction insert can just be clamped outside each inner edge ridge 2. Among them, in this embodiment, the diameter of the core column 1 is smaller than the diameter of the electromagnetic welding induction insert, so that an injection cavity is formed between the side surface of the core column 1, the inner edge ridges and the electromagnetic welding induction insert, and the inner sealing piece is injection-molded in this cavity.

[0029] The female mold is fitted corresponding to the male mold, see Figure 2 , at the center of the female mold, there is a cavity groove 3 for fitting the core column 1. The diameter of the cavity groove 3 is larger than the outer diameter of the electromagnetic welding induction insert, and the depth of the cavity groove 3 is the same as the height of the electromagnetic welding induction insert, so that the core column 1 nested with the electromagnetic welding induction insert can be smoothly fitted into the cavity groove 3. In addition, several outer edge ridges 4 for fitting with the outer edge surface of the electromagnetic welding induction insert are circumferentially arrayed on the groove wall of the cavity groove 3. Among them, the number of the outer edge ridges 4 is the same as the number of the inner edge ridges 2, and after the female mold and the male mold are correspondingly fitted, the outer edge ridges 4 and the inner edge ridges 2 are in one-to-one correspondence, and the corresponding outer edge ridges 4 and inner edge ridges 2 are arranged through the same diameter of the core column 1. Thus, an injection cavity is formed between the adjacent outer edge ridges, the cavity groove and the electromagnetic welding induction insert, and the outer sealing piece is injection-molded at the outer edge surface of the electromagnetic welding induction insert corresponding to each inner sealing piece position.

[0030] In order to realize the entry of the material in the injection cavity, see Figure 1 and Figure 2, a feed pipe hole 5 is provided at the center position of the cavity groove 3 of the female mold, and the feed pipe hole 5 penetrates through the female mold body and is connected to an external material source. Correspondingly, a material guiding groove is provided at the center position of the male mold core column 1. Considering that each inner edge convex rib and each outer edge convex rib are respectively in contact with both sides of the electromagnetic welding induction insert, the injection molding spaces between each inner edge convex rib and each outer edge convex rib are independent of each other, and the material cannot flow from one injection molding space to another. To enable each injection molding space to be filled with material, see Figure 1 , a number of material guiding grooves 6 are provided at the end face of the core column 1, and each material guiding groove 6 is conducted from the center of the core column 1 to the edge between the corresponding adjacent inner edge convex ribs of the core column 1. Thus, after the female mold and the male mold are correspondingly fitted, the material flowing into the mold through the feed pipe hole 5 of the female mold can be respectively injected into each injection molding space through each material guiding groove, and the inner sealing pieces and outer sealing pieces on both sides of the electromagnetic welding induction insert are correspondingly formed.

[0031] In some other embodiments, the outer edge convex ribs are not provided on the inner edge of the cavity groove of the female mold, and the inner diameter of the cavity groove matches the outer diameter of the electromagnetic welding induction insert, that is, the outer edge of the electromagnetic welding induction insert is directly in contact with the groove wall of the cavity groove, and only the inner sealing pieces are injection molded in a circumferential array at the inner edge of the electromagnetic welding induction insert.

[0032] In addition, in this embodiment, see Figure 1 , a shoulder 7 is provided at the bottom of the core column 1 and corresponding to the space between adjacent inner edge convex ribs. The outer diameter of the shoulder 7 is the same as the inner diameter of the electromagnetic welding induction insert. Thus, the shoulder 7 affects the injection molding space of the inner sealing piece, making the height of the inner sealing piece less than the height of the electromagnetic welding induction insert. Furthermore, when the pipe fitting is injection molded, the injection molding material of the pipe fitting can be injected into the space area corresponding to the shoulder 7 to ensure that the electromagnetic welding induction insert can be firmly embedded in the end of the pipe fitting. In some other embodiments, an annular boss is provided on the bottom end face of the cavity groove of the female mold. The outer diameter of the annular boss is the same as the inner diameter of the electromagnetic welding induction insert, the inner diameter of the annular boss is the same as the diameter of the core column, and the depth of the material guiding groove is greater than the height of the boss. Thus, a distance is left between the electromagnetic welding induction insert and the other end face of the inner sealing piece, so that the material can be injected into this area when the pipe fitting is formed, further ensuring that the electromagnetic welding induction insert is reliably coated in the end of the pipe fitting.

[0033] To facilitate the alignment between the female mold and the male mold and avoid relative displacement between the two during injection molding, see Figure 1 and Figure 2 , in this example, guiding columns 8 perpendicular to the end face of the male mold are respectively provided at the four corners of the male mold. Correspondingly, guiding grooves 9 corresponding to each guiding column 8 are respectively provided at the four corners of the female mold. Thus, through the corresponding fitting and guiding of the guiding columns 8 and the guiding grooves 9, the accurate alignment between the female mold and the male mold is ensured, and the relative position between the two is avoided during injection molding under the influence of injection pressure and the like, which affects the injection molding effect.

[0034] See Figure 3, when making an electromagnetic welding induction insert mold, the electromagnetic welding induction insert 12 is correspondingly nested outside each inner edge rib of the core column. Then, the injection molding machine pushes the female mold 10 to move so that it fits with the male mold 11, and injection molding is started. After the inner sealing piece and the outer sealing piece are correspondingly formed on both sides of the electromagnetic welding induction insert, the female mold 10 moves away from the male mold 11 to demold the pre-injection molded electromagnetic welding induction insert from the mold. However, considering that the temperature at the mold is relatively high just after injection molding, manual demolding is dangerous and inefficient. Therefore, in this embodiment, ejector rods are provided to achieve automatic demolding.

[0035] Specifically, refer to Figure 3 , the male mold 11 includes an end plate 13 and a fixing seat 14. The core column is arranged on one side of the end plate 13, and a fixing seat 14 is connected to the other side of the end plate 13. The male mold 11 is fixedly connected to the injection molding machine through the fixing seat 14. In order to achieve automatic demolding after injection molding of the electromagnetic welding induction insert, in this embodiment, the fixing seat 14 includes a seat plate and vertical plates arranged on both sides of the seat plate perpendicular to the seat plate. The ends of the two vertical plates are fixedly connected to the end plate 13, thereby forming a movable cavity between the end plate and the seat plate through the vertical plates, and a movable plate 15 for automatic demolding is arranged in the movable cavity. The movable plate 15 moves in the movable cavity in a direction perpendicular to the seat plate, that is, parallel to the axial direction of the core column. Further, refer to Figure 4 , a plurality of chutes 16 are arranged in a circumferential array along the outer edge of the core column 1 at the end plate 13, and each chute 16 penetrates through the end plate 13. A ejector rod 17 is slidably embedded in each chute 16. Refer to Figure 5 , one end of the ejector rod 17 is fixedly connected to the movable plate 15. In this embodiment, the layout positions of the ejector rods 17 correspond to each inner edge rib one by one, and the inner edge contour of the ejector rod 17 coincides with and matches the outer edge contour of the inner edge rib, so that the ejector rod 17 can move along the inner edge rib. Thus, through the linear movement of the movable plate 15 in the movable cavity, the synchronous extension or retraction of each ejector rod 17 along the chute 16 can be realized. Since the ejector rods 17 are arranged in a circumferential array along the outer edge of the core column 1, the end faces of the ejector rods 17 are in contact with the end faces of the electromagnetic welding induction insert nested outside the core column. After the electromagnetic welding induction insert is correspondingly injection molded, the movable plate moves to eject the ejector rod, and then the end face of the ejector rod pushes the end face of the electromagnetic welding induction insert, so that the electromagnetic welding induction insert moves along the axial direction of the core column to realize demolding. In some other embodiments, the chutes and the ejector rods are arranged in a circumferential array along the outer edge of the core column at other positions where they can be in contact with and resist the end face of the electromagnetic welding induction insert.

[0036] Specifically, to achieve the movement of the movable plate 15, a pushing hole is provided at the center of the seat plate of the fixed seat 14 for the pushing component of the injection molding machine to pass through the pushing hole to push the movable plate, so as to achieve the force-bearing movement of the movable plate. To ensure the reliable linear movement of the movable plate in the movable cavity, in this embodiment, limiting columns 18 are respectively arranged at the four corners of the movable plate, and limiting grooves matching the respective limiting columns are respectively arranged at the four corners of the end plate. The movement of the movable plate is guided by the movement of the limiting columns 18 along the limiting grooves. In addition, in this example, a return spring 19 is provided between the movable plate and the end plate outside the limiting column 18, so that after the ejector rod pushes the electromagnetic welding induction insert to demold, it automatically resets under the elastic force of the return spring.

[0037] Although some preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0038] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of its inventive concept. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. An electromagnetic welding induction insert mold, characterized in that, It includes a punch and a die corresponding to the active fitting; a core column with a diameter smaller than the inner diameter of the electromagnetic welding induction insert is provided on the corresponding end face of the punch. A plurality of inner edge ridges with outer edge surfaces for corresponding fitting with the inner edge surface of the electromagnetic welding induction insert are arranged in a circumferential array on the side surface of the core column. A cavity groove with a diameter larger than the outer diameter of the electromagnetic welding induction insert is provided on the corresponding end face of the die. A plurality of outer edge ridges for corresponding fitting with the outer edge surface of the electromagnetic welding induction insert are arranged in a circumferential array on the groove wall of the cavity groove. The inner edge ridges and the outer edge ridges correspond to each other one by one.

2. The electromagnetic welding induction insert mold according to claim 1, characterized in that, The height of the core column and the depth of the cavity groove respectively match the height of the electromagnetic welding induction insert.

3. The electromagnetic welding induction insert mold according to claim 1, characterized in that A feed pipe hole is provided at the center of the cavity groove. Each guide groove corresponding to the feed pipe hole is provided on the end face of the core column. The ends of the guide grooves are respectively communicated between adjacent inner edge ridges.

4. The electromagnetic welding induction insert mold according to claim 1, characterized in that, A shoulder is provided between adjacent inner edge ridges at the bottom of the core column. The outer edge contour of the shoulder matches the inner edge contour of the electromagnetic welding induction insert.

5. The electromagnetic welding induction insert mold according to claim 1, characterized in that, Guide columns are respectively provided at the four corners of the punch, and guide grooves matching the guide columns are respectively provided at the four corners of the die.

6. The electromagnetic welding induction insert mold according to claim 1, characterized in that The punch includes an end plate with the core column provided on one side and a fixed seat provided on the other side of the end plate for corresponding connection with an injection molding machine.

7. The electromagnetic welding induction insert mold according to claim 6, characterized in that, An activity cavity is provided between the fixed seat and the end plate. An activity plate moving along the axial direction parallel to the core column is provided in the activity cavity. A plurality of sliding grooves are provided in a circumferential manner along the edge of the core column on the end plate. A ejector rod fixedly connected with the activity plate is slidably embedded in the sliding grooves.

8. The electromagnetic welding induction insert mold according to claim 7, wherein, The inner edge surface contour of the ejector rod close to the core column matches the outer edge surface contour of the inner edge ridge.

9. The electromagnetic welding induction insert mold according to claim 7 or 8, characterized in that A return spring is provided between the activity plate and the end plate. A push hole for pushing the activity plate is provided on the end face of the fixed seat.

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