Injection mold for preventing weld lines from cracking

Abstract

The utility model discloses an injection mold for preventing weld lines from cracking, which comprises a first mold body, two cavities, a first main runner, a first branch runner and a first glue inlet point, the first main runner is arranged on the first mold body, and the two cavities are respectively arranged on two sides of the first main runner. The first main runner is communicated and connected with four first branch runners, each first branch runner is provided with four first glue inlet points, and the first glue inlet points are communicated and connected into the cavity; according to the utility model, the first main runner and the first sub-runner adopt the common runner design, so that the shearing effect is reduced, and the rubber feeding efficiency can be improved by increasing the runner area and adopting the design of four first rubber feeding points on the first sub-runner; and meanwhile, the auxiliary heating stirring device is additionally arranged at the junction of the materials, so that the fluidity of the materials can be improved, the mixing of the materials is promoted, and the filling effect of the materials is ensured, thereby effectively solving the problem that the weld lines are easy to crack.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold capable of preventing weld line cracking. Background Art

[0002] In plastic processing, when molten plastic flows and converges in the mold, due to differences in temperature, pressure, and flow rate at the front of the plastic melt in different parts, the convergence cannot be completely fused together, forming an obvious line mark, which is the weld line. The appearance of weld lines will have a certain impact on the appearance and performance of plastic products. In terms of appearance, the weld line may have problems such as color change and reduced gloss, affecting the beauty of the product. In terms of performance, the weld line is usually a weak area of ​​the plastic product, and its mechanical properties such as strength and toughness may be lower than other parts, and it is easy to crack, break, etc. during use. Existing injection molds such as the attached Figure 6 -Attached Figure 7 As shown, the second mold body utilizes a tumbling flow channel design. The second main flow channel is a 2.4mm trapezoidal channel, and the second branch flow channel is a 1.8mm trapezoidal channel. Two secondary glue inlet points are located on the second branch flow channel. This mold's tumbling flow channel design addresses the uneven glue flow across the four cavities. However, the forward and backward switching of the tumbling flow channel increases the shear rate of the material flow, affecting the flow rate and thus the filling effect. This can lead to cracking at the weld line during product assembly. Utility Model Content

[0003] The purpose of the utility model is to provide an injection mold which can prevent weld line cracking, so as to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: an injection mold for preventing weld line cracking, comprising a first mold body, a cavity, a first main channel, a first branch channel and a first glue inlet point, wherein a first main channel is provided on the first mold body, two cavities are provided on both sides of the first main channel, four first branch channels are conductively connected to the first main channel, and four first glue inlet points are provided on each of the first branch channels, and the first glue inlet points are conductively connected to the cavity.

[0005] Preferably, the shape of the first main flow channel is a circle with a diameter of 4.0 mm, and the shape of the first branch flow channel is a circle with a diameter of 3.0 mm.

[0006] Preferably, a plurality of threaded holes are provided on the lower surface of the first mold body, and auxiliary heating and stirring devices are installed in the threaded holes. The auxiliary heating and stirring device includes a shell, an adjusting flange, an external thread, a transducer, a variable amplitude rod, a mounting hole, a heating rod, a limiting flange, an arc-shaped groove, a spring, a groove and a retaining spring. The shell is provided with an external thread, and the external thread is threadedly connected to the threaded hole. The shell is fixedly connected with a transducer, and the output end of the transducer is fixedly connected with the variable amplitude rod. The output end of the variable amplitude rod is provided with an arc-surface protrusion, and the arc-surface protrusion is fixedly connected to the threaded hole.

[0007] Preferably, an adjustment flange is fixedly connected to the shell, and the adjustment flange is arranged at the bottom end of the first mold body.

[0008] Preferably, a mounting hole is provided on the upper surface of the amplitude transformer, a heating rod is slidably connected in the mounting hole, and an arc-shaped groove is provided on the top end of the heating rod.

[0009] Preferably, a spring is sleeved in the mounting hole, and one end of the spring is arranged in the mounting hole, and the other end is arranged at the bottom end of the heating rod.

[0010] Preferably, a groove is provided in the mounting hole, a retaining spring is sleeved in the groove, and the retaining spring is sleeved on the heating rod, a limiting flange is provided at the bottom end of the retaining spring, and the limiting flange is fixedly connected to the heating rod.

[0011] The utility model provides an injection mold for preventing weld line cracking, which has the following advantages: the utility model reduces shearing effect by adopting a common flow channel design for the first main flow channel and the first branch flow channel, and improves the glue feeding efficiency by increasing the flow channel area and adopting a design of four first glue feeding points on the first branch flow channel; at the same time, by adding an auxiliary heat stirring device at the intersection of materials, the fluidity of the material can be improved, the mixing of the materials can be promoted, and the filling effect of the materials can be ensured, thereby effectively solving the problem of easy cracking at the weld line. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 This is a schematic diagram of the overall main cutaway structure of the present invention;

[0014] Figure 2 for Figure 1 A magnified view of the structure of area A in the middle;

[0015] Figure 3This is a schematic diagram of the three-dimensional cross-section structure of the auxiliary heating and stirring device of the present invention;

[0016] Figure 4 for Figure 3 A magnified view of the structure of the middle B area;

[0017] Figure 5 This is a schematic diagram of the three-dimensional cross-section structure of the horn of the present utility model;

[0018] Figure 6 This is a schematic diagram of the main cross-sectional structure of the first mold body;

[0019] Figure 7 for Figure 6 A magnified view of the structure of the middle C region.

[0020] In the figure: 1. First mold body; 11. Cavity; 12. First main channel; 13. First branch channel; 14. First glue inlet point; 15. Threaded hole; 16. Arc-surface bump; 2. Auxiliary heating stirring device; 21. Shell; 22. Adjusting flange; 23. External thread; 24. Transducer; 25. Amplitude changer; 26. Mounting hole; 27. Heating rod; 28. Limiting flange; 29. ​​Arc groove; 210. Spring; 211. Groove; 212. Retaining spring; 3. Second mold body; 31. Second main channel; 32. Second branch channel; 33. Second glue inlet point. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Please see the attached Figure 1 -Attached Figure 5The utility model provides an embodiment: an injection mold for preventing weld line cracking, comprising a first mold body 1, a cavity 11, a first main flow channel 12, a first branch flow channel 13 and a first glue inlet point 14. The first mold body 1 is provided with a first main flow channel 12, and two mold cavities 11 are respectively provided on both sides of the first main flow channel 12. Four first branch flow channels 13 are conductively connected to the first main flow channel 12, and four first glue inlet points 14 are provided on the first branch flow channel 13. The first glue inlet points 14 are conductively connected to the cavity 11. The first main flow channel 12 and the first branch flow channel 13 of the first mold body 1 adopt ordinary flow channels, and the flow channel area is increased. At the same time, the design of four first glue inlet points 14 is adopted, which can To solve the problem of easy cracking at the weld line; the shape of the first main channel 12 is a circle with a diameter of 4.0 mm, and the shape of the first branch channel 13 is a circle with a diameter of 3.0 mm; a plurality of threaded holes 15 are provided on the lower surface of the first mold body 1, and an auxiliary heating stirring device 2 is installed in the threaded holes 15. The auxiliary heating stirring device 2 includes a shell 21, an adjusting flange 22, an external thread 23, a transducer 24, a horn 25, a mounting hole 26, a heating rod 27, a limiting flange 28, an arc groove 29, a spring 210, a groove 211 and a retaining spring 212. An external thread 23 is provided on the shell 21, and the external thread 23 is threadedly connected to the threaded hole 15. A transducer 24 is fixedly connected to the shell 21, and the transducer 24 The output end of the horn 25 is fixedly connected to the output end of the horn 25, and the output end of the horn 25 is provided with a cambered convex block 16, and the cambered convex block 16 is fixedly connected to the threaded hole 15. The auxiliary heat stirring device 2 uses the ultrasonic energy converted by the transducer 24 to be transmitted to the cambered convex block 16 through the horn 25, so that the materials in the intersection area produce mechanical vibration and are fully fused, thereby suppressing the generation of weld lines; an adjusting flange 22 is fixedly connected to the shell 21, and the adjusting flange 22 is provided at the bottom end of the first mold body 1, and the adjusting flange 22 is used to facilitate the twisting of the shell 21; a mounting hole 26 is provided on the upper surface of the horn 25, and a heating rod 27 is slidably connected to the mounting hole 26, and an arc groove 29 is provided on the top of the heating rod 27. 27 is used to compensate for the heat of the material, and the arc-shaped groove 29 is used to better fit the arc-shaped protrusion 16; a spring 210 is sleeved in the mounting hole 26, and one end of the spring 210 is arranged in the mounting hole 26, and the other end is arranged at the bottom end of the heating rod 27, and the spring 210 is used to provide a reset elastic force for the heating rod 27; a groove 211 is provided in the mounting hole 26, and a retaining spring 212 is sleeved in the groove 211, and the retaining spring 212 is sleeved on the heating rod 27, and a limiting flange 28 is provided at the bottom end of the retaining spring 212, and the limiting flange 28 is fixedly connected to the heating rod 27, the groove 211 is used to install the retaining spring 212, and the retaining spring 212 is used to limit the limiting flange 28, thereby limiting the movement of the heating rod 27.

[0023] Working principle: When using the present invention, the threaded hole 15 is designed at the intersection of the materials, and the ultrasonic generator is started by the controller. The ultrasonic generator transmits the ultrasonic energy to the transducer 24 via the signal line, and the energy converted by the transducer 24 is transmitted to the arc-surface protrusion 16 via the amplitude rod 25, so that the materials in the intersection area produce mechanical vibrations and are fully integrated, thereby suppressing the generation of weld lines, and under the elastic action of the spring 210, the heating rod 27 fits the arc-surface protrusion 16 through the arc groove 29 at the top, and the heating rod 27 is started by the controller to compensate the heat of the materials in the intersection area, promote the fluidity of the materials, and thus enhance the effect of vibration mixing; wherein, compared with the second mold body 3, the first mold body 1 cancels the design of the flip flow channel to reduce the shearing effect, Compared with the original second main channel 31 and second branch channel 32, the first main channel 12 and the first branch channel 13 increase the flow channel area, and at the same time, the original two second glue feeding points 33 are changed to four first glue feeding points 14, which improves the glue feeding efficiency. This structure solves the problem of weld lines very well. The cavity 11 is the product molding area. The adjustment flange 22 is a regular hexagon, which is convenient for twisting the shell 21. The external thread 23 cooperates with the threaded hole 15 to realize the threaded connection between the shell 21 and the threaded hole 15. The retaining spring 212 is used to limit the limiting flange 28 to limit the movement of the heating rod 27. The mounting hole 26 is used to install the heating rod 27 and the spring 210. The groove 211 is used to install the retaining spring 212. The controller and ultrasonic generator adopt existing technology and are not shown in the figure.

[0024] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0025] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An injection mold for preventing weld line cracking, comprising a first mold body (1), a mold cavity (11), a first main flow channel (12), a first branch flow channel (13) and a first glue inlet point (14), characterized in that: The first mold body (1) is provided with a first main flow channel (12), two mold cavities (11) are respectively provided on both sides of the first main flow channel (12), four first branch flow channels (13) are conductively connected to the first main flow channel (12), and four first glue inlet points (14) are provided on each of the first branch flow channels (13), and the first glue inlet points (14) are conductively connected to the mold cavities (11).

2. The injection mold for preventing weld line cracking according to claim 1, characterized in that: The shape of the first main flow channel (12) is a circle with a diameter of 4.0 mm, and the shape of the first branch flow channel (13) is a circle with a diameter of 3.0 mm.

3. The injection mold for preventing weld line cracking according to claim 1, characterized in that: The lower surface of the first mold body (1) is provided with a plurality of threaded holes (15), and an auxiliary heating stirring device (2) is installed in each of the threaded holes (15). The auxiliary heating stirring device (2) comprises a shell (21), an adjusting flange (22), an external thread (23), a transducer (24), a variable amplitude rod (25), a mounting hole (26), a heating rod (27), a limiting flange (28), an arc-shaped groove (29), a spring (210), a groove (211) and a retaining spring (212). The shell (21) is provided with an external thread (23), and the external thread (23) is threadedly connected to the threaded hole (15). The shell (21) is fixedly connected with the transducer (24), and the output end of the transducer (24) is fixedly connected with the variable amplitude rod (25). The output end of the variable amplitude rod (25) is provided with an arc-surface protrusion (16), and the arc-surface protrusion (16) is fixedly connected to the threaded hole (15).

4. The injection mold for preventing weld line cracking according to claim 3, characterized in that: An adjusting flange (22) is fixedly connected to the shell (21), and the adjusting flange (22) is arranged at the bottom end of the first mold body (1).

5. The injection mold for preventing weld line cracking according to claim 3, characterized in that: The upper surface of the amplitude changing rod (25) is provided with a mounting hole (26), a heating rod (27) is slidably connected in the mounting hole (26), and an arc groove (29) is provided at the top end of the heating rod (27).

6. The injection mold for preventing weld line cracking according to claim 5, characterized in that: A spring (210) is sleeved in the mounting hole (26), and one end of the spring (210) is arranged in the mounting hole (26), and the other end is arranged at the bottom end of the heating rod (27).

7. The injection mold for preventing weld line cracking according to claim 6, characterized in that: A groove (211) is provided in the mounting hole (26), a retaining spring (212) is sleeved in the groove (211), and the retaining spring (212) is sleeved on the heating rod (27), a limiting flange (28) is provided at the bottom end of the retaining spring (212), and the limiting flange (28) is fixedly connected to the heating rod (27).

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