Injection mold for feeding glue into front mold core

Abstract

The utility model discloses a front mold core glue feeding injection mold, which comprises a fixed mold (1) and a movable mold (2) which are arranged up and down, the fixed mold (1) is provided with a front mold core (3), the front mold core (3) is provided with a rear mold core (4) which is matched with the front mold core (3), and mold grooves of the front mold core (3) and the rear mold core (4) are enclosed to form a closed mold cavity, and is characterized in that a fixed part (5) is arranged on the bottom surface of the rear mold core (4); a glue injection runner (6) is arranged on the fixing piece (5), the glue inlet end of the glue injection runner (6) is connected with a glue inlet runner (7) extending to the outside of the rear mold core (4), and the glue outlet end of the glue injection runner (6) faces a mold groove of the front mold core (3); the area of the water gap is reduced in a flow channel narrowing mode, automatic falling is facilitated, meanwhile, the tension bar is arranged nearby the water gap to concentrate stress so as to improve the flatness of the water gap surface, and the yield of finished products is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, and in particular to a front mold core injection mold. Background Technology

[0002] Injection molds are molds used in the plastics processing industry to form plastic products. They are key equipment in the injection molding process and are widely used in many fields. They form the desired finished product by injecting molten injection material into the mold cavity. Existing injection molds, such as the Chinese utility model patent with announcement number CN210453587U, disclose a hot runner system and injection mold for injection molds. Specifically, it includes a fixed mold plate, a moving mold plate, a hot nozzle, a runner, a cavity mold, and a punch mold. It achieves injection molding by filling the cavity mold and punch mold with raw material through the runner via the hot nozzle connected to the moving mold plate. Subsequently, the moving mold plate moves to complete the mold opening. However, during the mold opening process, the block formed in the runner will be connected to the finished product. Due to the large contact surface, it is not easy to detach. When the moving mold moves, the block is carried out with the hot nozzle. It relies on the weight of the finished product to separate from the block. It is easy to cause unevenness of the gate fracture surface due to uneven stress, resulting in poor yield. Utility Model Content

[0003] The purpose of this invention is to provide a front-end injection mold. This invention reduces the gate area by narrowing the runner, facilitating automatic removal. Simultaneously, a tension bar is placed near the gate to concentrate force and improve the flatness of the gate surface, effectively increasing the yield rate of finished products.

[0004] The technical solution of this utility model: A front mold core injection mold includes a fixed mold and a moving mold arranged vertically. A front mold core is provided on the fixed mold, and a matching rear mold core is provided on the front mold core. The mold grooves of the front and rear mold cores enclose a closed mold cavity. A fixing member is provided on the bottom surface of the rear mold core, and an injection channel is provided on the fixing member. The injection end of the injection channel is connected to an injection channel extending to the outside of the rear mold core, and the outlet end of the injection channel faces the mold groove of the front mold core. The injection channel includes an injection channel... The horizontal injection section is connected to the flow channel. The end of the horizontal injection section is provided with an arc-shaped variable diameter flow passage that is connected to the fixing member and bends upward in the middle. The outer diameter of the flow channel on the injection side of the arc-shaped variable diameter flow passage is larger than the outer diameter of the flow channel on the outlet side. The end of the arc-shaped variable diameter flow passage is provided with an injection part located in the mold groove of the front mold core. The bottom of the horizontal injection section is provided with a tension rod. The front mold core and the fixed mold are provided with tension rod channels corresponding to the tension rod. The moving mold is provided with a tension rod positioning groove that fits with the end of the tension rod.

[0005] In the aforementioned front mold core injection mold, the ratio of the maximum outer diameter of the arc-shaped variable diameter flow section to the outer diameter of the flow section of the injection part is greater than 2:1.

[0006] In the aforementioned front mold core injection mold, the inlet side flow channel and the outlet side flow channel of the arc-shaped variable diameter flow section are transitioned by a conical curved surface.

[0007] In the aforementioned front mold core injection mold, the lateral span of the arc-shaped variable diameter flow section is 12-15mm; the maximum outer diameter of the flow channel of the arc-shaped variable diameter flow section is 6-7mm; and the outer diameter of the flow channel of the injection part is 2-3mm.

[0008] In the aforementioned front mold core injection mold, the bottom of the horizontal injection section is provided with a connecting rod, and the end of the connecting rod is detachably connected to the end of the tension rod.

[0009] In the aforementioned front mold core injection mold, the axes of the tension rod channel and the tension rod positioning groove are collinear and remain vertical.

[0010] In the aforementioned front mold core injection mold, multiple fixing members are arranged around the middle of the rear mold core, and the end of the injection channel is connected to the injection channel of each fixing member.

[0011] In the aforementioned front mold core injection mold, the bottom surface of the rear mold core is provided with a first groove that fits with the injection channel.

[0012] In the aforementioned front mold core injection mold, the bottom surface of the rear mold core is provided with a second groove that matches the fixing member; the fixing member is provided with a threaded fixing hole, and the rear mold core is provided with a fixing bolt that mates with the threaded fixing hole.

[0013] In the aforementioned front mold core injection mold, the fixing component is provided with an arc-shaped positioning groove that matches the arc-shaped variable diameter through section; the bottom surface of the fixing component is provided with a shaping block that wraps around the injection part.

[0014] Compared with the prior art, this utility model fastens the rear mold core to the front mold core before operation. After operation, the molten injection material enters the injection runner through the sprue until it reaches the mold cavity of the front and rear mold cores, forming the finished mold part. Then, the moving mold moves upward, and the tension rod, together with the fixing part, drives the injection runner and the injection channel to move, so that it separates from the finished product. Since the ratio of the maximum outer diameter of the arc-shaped variable diameter flow section to the outer diameter of the injection part is greater than 2:1, the flow channel narrows and the gate area is reduced. Moreover, the injection runner changes the orientation of the injection part through its arc-shaped variable diameter flow section, so that the injection material in the injection runner is connected to the finished product vertically. The vertical separation method allows for sufficient force to be applied, which is conducive to automatic detachment. Furthermore, the tension rod is arranged near the gate to concentrate the force, further improving the flatness of the gate surface. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2This is a schematic diagram of the front mold core portion after the rear mold core has been removed;

[0017] Figure 3 This is a cross-sectional structural diagram of the fastener portion of this utility model;

[0018] Figure 4 This is a connection diagram of the tension rod of this utility model;

[0019] Figure 5 This is a schematic diagram showing the connection between the tension rod and the moving mold and the front mold core of this utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the bottom surface of the rear mold core of this utility model.

[0021] The markings in the attached diagram are as follows: 1. Fixed mold; 2. Moving mold; 3. Front mold core; 4. Rear mold core; 5. Fixing component; 6. Injection channel; 7. Inlet channel; 8. Horizontal inlet section; 9. Arc-shaped variable diameter through section; 10. Injection section; 11. Pull rod; 12. Pull rod channel; 13. Pull rod positioning groove; 14. Connecting rod; 15. First groove; 16. Second groove; 17. Threaded fixing hole; 18. Fixing bolt; 19. Arc-shaped positioning groove; 20. Shaping block. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0023] Example: The front mold core is fed into the injection mold, as shown in the attached diagram. Figure 1 As shown, the system includes a fixed mold 1 and a moving mold 2 arranged vertically. The fixed mold 1 has a front mold core 3, and the front mold core 3 has a matching rear mold core 4. The mold grooves of the front mold core 3 and the rear mold core 4 enclose a closed mold cavity. The fixed mold is installed on the fixed template (not shown in the figure) of the injection molding machine, serving as the fixed part of the mold and providing a mounting base for other mold components such as the front mold core. It also has an ejector rod inside for ejecting the finished product. The moving mold is installed on the moving template (not shown in the figure) of the injection molding machine and is driven to open and close the mold cavity. These are all techniques well-known and mastered by those skilled in the art, and will not be described in detail here. (See attached...) Figure 2 and attached Figure 3As shown, a fixing member 5 is mounted on the bottom surface of the rear mold core 4, and an injection channel 6 is mounted on the fixing member 5. The injection channel 6 has an integrally formed L-shaped injection channel 7 extending to the outside of the rear mold core 4 at its inlet end, and its outer end is connected to a hot nozzle to realize the injection of injection material. The outlet end of the injection channel 6 faces the mold groove of the front mold core 3. The injection channel 6 includes a horizontal injection part 8 connected to the injection channel 7, which facilitates contact with the front mold core surface to maintain stability, and has a uniform shape and reliable structural strength. The end of the horizontal injection part 8 is integrally formed with a part connected to the fixing member 5 and has a middle The curved, variable-diameter flow channel 9 bends upwards, with the outer diameter of the inlet channel of the curved, variable-diameter flow channel 9 being larger than the outer diameter of the outlet channel. An integrally formed injection section 10 is located within the mold groove of the front mold core 3 at the end of the curved, variable-diameter flow channel 9. The ratio of the maximum outer diameter of the flow channel of the curved, variable-diameter flow channel 9 to the outer diameter of the flow channel of the injection section 10 is greater than 2:1, and in this embodiment, it is 13:5. The lateral span of the curved, variable-diameter flow channel 9 is 14mm, the maximum outer diameter of the flow channel of the curved, variable-diameter flow channel 9 is 6.5mm, and the outer diameter of the flow channel of the injection section 10 is 2.5mm. (See attached...) Figure 4 and attached Figure 5 As shown, a tension rod 11 is fitted at the bottom of the horizontal injection section 8. A tension rod channel 12 corresponding to the tension rod 11 is opened in the front mold core 3 and the fixed mold 1. A tension rod positioning groove 13, which engages with the end protrusion of the tension rod 11, is opened on the moving mold 2 for force transmission. The injection side flow channel and the outlet side flow channel of the arc-shaped variable diameter flow section 9 transition through a conical curved surface, improving the smoothness of the injection molding material flow. A solid connecting rod 14 is integrally formed at the bottom of the horizontal injection section 8, connecting... The end of the connecting rod 14 and the end of the tension rod 11 are detachably connected through a hook groove and hook block, ensuring reliable force transmission. The axes of the tension rod channel 12 and the tension rod positioning groove 13 are collinear and vertical, ensuring the positioning accuracy of the tension rod and the reliability of its movement. Four fixing members 5 are arranged around the center of the rear mold core 4, and the ends of the injection channels 7 are connected to the injection channels 6 of each fixing member 5, enabling multi-station injection molding and improving processing efficiency. (See attached...) Figure 6 As shown, the bottom surface of the rear mold core 4 has a first groove 15 that fits with the injection channel 7, reducing protrusions and improving positioning reliability; the bottom surface of the rear mold core 4 has a second groove 16 that fits with the fixing member 5, reducing protrusions and improving positioning reliability; the fixing member 5 has a threaded fixing hole 17, and the rear mold core 4 has a fixing bolt 18 that fits with the threaded fixing hole 17, so that the fixing member can be detachably connected by the fixing bolt, which is convenient for disassembly and maintenance; the fixing member 5 has an arc-shaped positioning groove 19 that fits with the arc-shaped variable diameter glue passage 9, which fully wraps around the part to improve positioning reliability; the bottom surface of the fixing member 5 is provided with a hemispherical shaping block 20 that wraps around the injection part 10, which on the one hand prevents the injection material from overflowing into the fixing member, and on the other hand shapes the molding position of the injection part to ensure the aesthetic appearance of the finished product.

[0024] Working principle:

[0025] Mold Closure Preparation: Before operation, the rear mold core 4 is precisely fastened onto the front mold core 3, ensuring that the mold grooves of the two fit tightly together to form a closed and precisely sized mold cavity. During this process, the first groove 15 on the bottom surface of the rear mold core 4 precisely matches the injection channel 7, and the second groove 16 is tightly fitted with the fixing part 5. The fixing part 5 is securely connected to the rear mold core 4 by fixing bolts 18. At the same time, the arc-shaped positioning groove 19 in the fixing part 5 accurately positions the arc-shaped variable diameter section in the injection channel 6, ensuring the stability and sealing of the entire mold in the mold-closed state, laying the foundation for subsequent injection molding processes.

[0026] Injection Molding: After the operation begins, the injection molding machine injects the high-temperature molten injection material through a hot nozzle connected to the outer end of the injection runner 7. The material first enters the injection runner 7, and due to its special L-shaped design, it can effectively guide the material to the injection runner 6. Next, the material flows into the horizontal injection section 8. This section, with its stable structure that fits against the front mold core surface, allows the material to flow smoothly. Subsequently, the material enters the arc-shaped variable diameter flow section. Because the outer diameter of the injection side flow channel is larger than the outer diameter of the outlet side flow channel, and the injection side and outlet side are transitioned by a conical curved surface, the material flow rate can be effectively slowed down, allowing the material to fill the mold cavity more evenly, while reducing flow resistance and pressure loss. Finally, the material enters the mold cavity through the injection section 10, filling every corner of the mold cavity. Under the action of pressure and temperature, it gradually cools and solidifies to form the finished molded part.

[0027] Mold opening and separation: After the molded part is formed, the moving mold 2 begins to move upward under the drive of the injection molding machine. At this time, the tension rod 11 plays a key role. Its end fits tightly with the tension rod positioning groove 13 on the moving mold 2. When the moving mold moves upward, the tension rod 11 moves accordingly. Since the tension rod 11 is reliably connected to the connecting rod 14 at the bottom of the horizontal injection section 8, the tension rod 11 drives the entire injection channel 6 and the injection channel 7 to move upward. At the same time, the special structure of the arc-shaped variable diameter flow section makes the injection material in the injection channel 6 connected to the finished product vertically. Moreover, the ratio of the maximum outer diameter of the arc-shaped variable diameter flow section to the outer diameter of the injection section 10 is greater than 2:1. The narrowing of the flow channel reduces the gate area. This structural design makes the force concentrated at the gate during the upward movement of the moving mold, and the finished product can be smoothly separated from the remaining material in the injection channel. In addition, the gate surface is flat, which greatly improves the yield of the finished product.

[0028] Subsequent processing: After the mold is opened, the push rod inside the fixed mold 1 pushes the finished product out of the mold cavity for subsequent demolding, trimming, inspection and other processes; at the same time, all parts of the mold return to their initial state, ready for the next injection molding production cycle; throughout the process, the shaping block 20 on the bottom surface of the fixing part 5 always protects and shapes the injection part 10, preventing the injection material from overflowing into the fixing part, and ensuring the aesthetic appearance and dimensional accuracy of the finished product.

[0029] The above embodiments merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. Furthermore, in these embodiments, "up," "down," "left," "right," "front," and "back" represent relative positions only, not absolute positions. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A front mold core injection mold, comprising a fixed mold (1) and a moving mold (2) arranged vertically, wherein a front mold core (3) is provided on the fixed mold (1), and a matching rear mold core (4) is provided on the front mold core (3), wherein the mold grooves of the front mold core (3) and the rear mold core (4) enclose a closed mold cavity, characterized in that: The bottom surface of the rear mold core (4) is provided with a fixing member (5), and the fixing member (5) is provided with a glue injection channel (6). The glue injection channel (6) is connected to a glue injection channel (7) extending to the outside of the rear mold core (4) at the glue inlet end. The glue injection channel (6) is directed towards the mold groove of the front mold core (3). The glue injection channel (6) includes a horizontal glue inlet section (8) connected to the glue injection channel (7). The end of the horizontal glue inlet section (8) is provided with an arc-shaped variable diameter glue channel that is connected to the fixing member (5) and bends upward in the middle. The outer diameter of the inlet flow channel of the arc-shaped variable diameter glue passage (9) is larger than the outer diameter of the outlet flow channel; the end of the arc-shaped variable diameter glue passage (9) is provided with a glue injection part (10) located in the mold groove of the front mold core (3); the bottom of the horizontal glue injection part (8) is provided with a tension rod (11); the front mold core (3) and the fixed mold (1) are provided with a tension rod channel (12) corresponding to the tension rod (11); the moving mold (2) is provided with a tension rod positioning groove (13) that fits with the end of the tension rod (11).

2. The injection mold for front mold core injection as described in claim 1, characterized in that: The ratio of the maximum outer diameter of the flow channel of the arc-shaped variable diameter glue section (9) to the outer diameter of the flow channel of the glue injection section (10) is greater than 2:

1.

3. The injection mold for front mold core injection as described in claim 1, characterized in that: The inlet and outlet flow channels of the arc-shaped variable diameter glue section (9) are transitioned by a conical curved surface.

4. The injection mold for front mold core injection as described in claim 1, characterized in that: The lateral span of the arc-shaped variable diameter glue passage (9) is 12-15mm; the maximum outer diameter of the flow channel of the arc-shaped variable diameter glue passage (9) is 6-7mm; and the outer diameter of the flow channel of the glue injection part (10) is 2-3mm.

5. The injection mold for front mold core injection according to claim 1, characterized in that: The bottom of the horizontal glue inlet (8) is provided with a connecting rod (14), and the end of the connecting rod (14) is detachably connected to the end of the tension rod (11).

6. The injection mold for front mold core injection according to claim 1, characterized in that: The axes of the tension rod channel (12) and the tension rod positioning groove (13) are collinear and remain vertical.

7. The injection mold for front mold core injection according to claim 1, characterized in that: The fixing member (5) is provided in multiple ways around the middle of the rear mold core (4), and the end of the glue injection channel (7) is connected to the glue injection channel (6) of each fixing member (5).

8. The injection mold for front mold core injection according to claim 1, characterized in that: The bottom surface of the rear mold core (4) is provided with a first groove (15) that fits into the glue inlet channel (7).

9. The injection mold for front mold core injection according to claim 1, characterized in that: The bottom surface of the rear mold core (4) is provided with a second groove (16) that is adapted to the fixing member (5); the fixing member (5) is provided with a threaded fixing hole (17), and the rear mold core (4) is provided with a fixing bolt (18) that mates with the threaded fixing hole (17).

10. The injection mold for front mold core injection according to claim 1, characterized in that: The fixing member (5) is provided with an arc-shaped positioning groove (19) that fits the arc-shaped variable diameter glue passage (9); the bottom surface of the fixing member (5) is provided with a shaping block (20) that wraps the glue injection part (10).

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