Mold for injection molding

Abstract

The utility model relates to the technical field of injection molding, in particular to a mold for injection molding. In order to solve the problem that an injection molding product with an internal thread is easy to overflow glue, the utility model provides an injection molding mold, an insert pin is arranged in a mold groove, a flow blocking wall is arranged on the periphery of the insert pin, and a clamping groove for placing an internal thread accessory is formed between the flow blocking wall and the insert pin. When the injection mold disclosed by the utility model is used for injection molding of an injection product with internal threads, an internal thread accessory is sleeved on the insert pin and is inserted into the clamping groove. Thus, when injection molding melt glue is injected, the flow blocking wall is used for preventing the injection molding melt glue from impacting the internal thread accessory and causing the occurrence position of the internal thread accessory, and the flow blocking wall is used for preventing the injection molding melt glue from flowing into the internal thread accessory through a gap between the insert pin and the internal thread accessory, so that the injection molding quality and the yield of injection molding products are improved; and the injection cost of injection products is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to a mold for injection molding. Background Art

[0002] When using injection molds to produce precision injection products with internal thread accessories, the internal thread accessories are usually placed directly on the insert pins in the injection mold. However, during injection molding, the internal thread accessories are easily displaced due to the impact of the high-speed injection melt, causing the injection melt to flow into the internal thread accessories along the gap between the insert pin and the internal thread accessories, resulting in glue blockage of the internal thread accessories after demoulding, and even causing the internal threads to fail, that is, causing the injection molded product to be scrapped. Summary of the invention

[0003] In order to solve the problem of glue overflow in injection products with internal threads, the utility model proposes an injection mold, in which a pin is arranged in the mold groove of the injection mold, and a flow-blocking wall is arranged around the pin, and a slot for placing the internal thread accessory is formed between the flow-blocking wall and the pin. When the injection mold of the utility model is used to injection mold an injection product with internal threads, the internal thread accessory is placed on the pin and inserted into the slot. In this way, when the injection melt is injected, the flow-blocking wall can be used to prevent the injection melt from impacting the internal thread accessory and causing the internal thread accessory to be displaced. At the same time, the flow-blocking wall can also be used to prevent the injection melt from flowing into the internal thread accessory through the gap between the pin and the internal thread accessory, that is, the problem of glue blocking the internal thread hole due to glue overflow during injection molding of injection products with internal threads is solved, the injection molding quality and yield rate of the injection molded products are improved, and the injection molding cost of the injection molded products is reduced.

[0004] Preferably, the baffle wall is an annular protrusion, and the central axis of the annular protrusion coincides with the central axis of the insert pin. In this way, by using the annular protrusion as the baffle wall, the annular outer edge of the baffle wall can be used to drain the injection molten plastic when the injection molten plastic is injected, thereby reducing the impact force of the injection molten plastic, and it is convenient for processing, thereby reducing the processing cost of the injection molding mold of the utility model. Furthermore, the difference n between the inner radius R of the baffle wall and the outer radius r of the insert pin is greater than or equal to the wall thickness w of the internal threaded accessory. In this way, the groove width of the slot between the baffle wall and the insert pin is greater than or equal to the wall thickness of the internal threaded accessory, which is convenient for the injection molding personnel to assemble the internal threaded accessory onto the insert pin and clamp it in the slot.

[0005] Preferably, a vacuum through hole is provided on the insert pin. In this way, during injection molding, the vacuum through hole can be connected to the injection molding machine, and the injection molding machine can be used to evacuate the internal threaded accessories through the vacuum through hole, so that the internal threaded accessories are vacuum adsorbed on the insert pin and the groove wall of the mold groove, thereby avoiding displacement of the internal threaded accessories due to the impact of the injection molten glue during injection of the injection molding melt, preventing the injection molding melt injected at a high speed from entering the internal threaded accessories, and improving the injection molding quality of the injection molded product. Furthermore, the central axis of the vacuum through hole coincides with the central axis of the insert pin. In this way, the vacuum through hole is located in the middle of the insert pin and passes through both ends of the insert pin, which is simple and convenient to process, and can further reduce the processing and production cost of the injection mold of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a schematic diagram of the structure of the injection molding mold of the utility model;

[0007] Figure 2 for Figure 1 A schematic top view of the injection mold shown;

[0008] Figure 3 for Figure 2 AA cross-sectional structure diagram in;

[0009] Figure 4 for Figure 3 Magnified schematic diagram of Q in . DETAILED DESCRIPTION

[0010] Next, combine Figures 1 to 4 , the injection molding mold of the utility model is described in detail.

[0011] like Figures 1 to 4 As shown, a pin 2 is arranged in the mold groove 1 of the injection mold of the utility model, and a baffle wall 3 is arranged around the pin 2, and a slot 11 for placing the internal thread accessory 4 is formed between the baffle wall 3 and the pin 2. When the injection mold of the utility model is used to inject an injection product with an internal thread, the internal thread accessory 4 is sleeved on the pin 2 and inserted into the slot 11. Preferably, the baffle wall 3 is an annular protrusion, and the central axis of the annular protrusion coincides with the central axis of the pin 2. In this way, the use of the annular protrusion as the baffle wall 3 can not only use the annular outer edge of the baffle wall 3 to drain the injection melt when the injection melt is injected, reduce the impact force of the injection melt, but also facilitate processing and reduce the processing cost of the injection mold of the utility model. Preferably, the difference n between the inner radius R of the baffle wall 3 and the outer radius r of the pin 2 is greater than or equal to the wall thickness w of the internal thread accessory 4. In this way, the width of the slot 11 between the baffle wall 3 and the insert pin 2 is greater than or equal to the wall thickness of the internal thread accessory 4 , which makes it convenient for the injection molding personnel to assemble the internal thread accessory 4 onto the insert pin 2 and insert it into the slot 11 .

[0012] like Figures 1 to 4 As shown, a vacuum through hole 21 is provided on the insert pin 2. In this way, during injection molding, the vacuum through hole 21 can be connected to the injection molding machine (not shown in the figure), and the injection molding machine is used to evacuate the internal threaded accessory 4 through the vacuum through hole 21, so that the internal threaded accessory 4 is vacuum-adsorbed on the insert pin 2 and the groove wall of the mold groove 1, so as to avoid displacement of the internal threaded accessory 4 due to the impact of the injection molten glue during injection of the injection molten glue, and prevent the injection molten glue injected at a high speed from entering the internal threaded accessory 4, thereby improving the injection molding quality of the injection molded product. Preferably, the central axis of the vacuum through hole 21 coincides with the central axis of the insert pin 2. In this way, the vacuum through hole 21 is located in the middle of the insert pin 2 and passes through both ends of the insert pin 2, which is simple and convenient to process, and can further reduce the processing and production cost of the injection mold of the utility model.

[0013] In this way, when the injection molding melt is injected, the baffle wall can be used to prevent the injection molding melt from impacting the internal threaded accessories and causing the internal threaded accessories to move. At the same time, the baffle wall can also be used to prevent the injection molding melt from flowing into the internal threaded accessories through the gap between the insert pin and the internal threaded accessories, thereby avoiding the problem of glue blockage in the threaded holes of the injection molded products, improving the injection quality of the injection molded products, and then improving the yield of the injection molded products and reducing the injection cost of the injection molded products.

Claims

1. A mold for injection molding, characterized in that: An insert pin is arranged in the mold groove of the injection mold, and a flow-blocking wall is arranged around the insert pin, and a slot for placing an internal threaded accessory is formed between the flow-blocking wall and the insert pin; the flow-blocking wall is an annular protrusion, and the central axis of the annular protrusion coincides with the central axis of the insert pin.

2. The injection mold according to claim 1, characterized in that: The difference n between the inner radius R of the baffle wall and the outer radius r of the insert pin is greater than or equal to the wall thickness w of the internal threaded accessory.

3. The injection mold according to claim 1 or 2, characterized in that: The inlay pin is provided with a vacuum through hole.

4. The injection mold according to claim 3, characterized in that: The central axis of the vacuum through hole coincides with the central axis of the insert pin.

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