Exhaust structure for thin-walled products

Abstract

The utility model relates to injection molding structure technical field, concretely relates to a thin -walled product exhaust structure, apply to injection mold, the lower mould core of injection mold is provided with insert assembly, is provided with exhaust structure on insert assembly, exhaust structure includes multiple primary exhaust passage below injection space of injection mold, primary exhaust passage communicates with injection space through the sealing glue gap, and the secondary exhaust passage is connected below primary exhaust passage, the width of primary exhaust passage is greater than the width of sealing glue gap, the width of primary exhaust passage is less than the width of secondary exhaust passage. The utility model injection molding, when the molten plastic fills into the mould cavity quickly, gas enters primary exhaust passage through the sealing glue gap, then enters secondary exhaust passage again, and finally is discharged outside the mould cavity, thereby ensuring that the molten plastic can fill the mould cavity successfully, improves the stability of making thin -walled product body quality, improves the yield rate.

Description

Technical Field

[0001] This utility model relates to the field of injection molding structure technology, and in particular to a venting structure for thin-walled products. Background Technology

[0002] In conventional mold design, injection molding of thin-walled rib products is quite difficult. When the rib thickness is only 0.18mm, it is suggested that the customer increase the thickness. However, since the product needs to be modified, the customer generally does not accept the suggestion to increase the thickness. Direct injection molding of thin-walled rib products is difficult due to the thin wall thickness, making it difficult to fill. This can easily lead to missing glue after injection molding, resulting in unstable product quality. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to propose a venting structure for thin-walled products to solve the problem of unstable product quality.

[0004] To achieve the above objectives, this utility model provides a venting structure for thin-walled products, applied to injection molds. The lower mold core of the injection mold is provided with an insert assembly, and the insert assembly is provided with a venting structure. The venting structure includes multiple primary venting channels located below the cavity of the injection mold. The primary venting channels are connected to the cavity through a sealing gap. A secondary venting channel is connected below the primary venting channel. The width of the primary venting channel is greater than the width of the sealing gap, and the width of the primary venting channel is less than the width of the secondary venting channel.

[0005] The insert assembly includes multiple insert plates arranged in a row. The sealing gap, primary venting channel and secondary venting channel are all located between two adjacent insert plates, and the sealing gap, primary venting channel and secondary venting channel are arranged sequentially from top to bottom.

[0006] Optionally, the sealing gap is a sealing surface, and the height of the sealing surface is 0.2mm.

[0007] Optionally, the sealing gap is formed by partially fitting the sidewalls of two adjacent insert plates together.

[0008] Optionally, the width of the primary exhaust channel is 0.01 mm.

[0009] Optionally, the width of the secondary exhaust channel is 0.2 mm.

[0010] The beneficial effects of this utility model are as follows: The venting structure for thin-walled products provided by this utility model allows for rapid gas discharge during injection molding when molten plastic quickly fills the mold cavity. The gas is compressed by the molten plastic and needs to be quickly discharged out of the cavity. At this time, the gas enters the primary venting channel through the sealing gap, then enters the secondary venting channel, and finally discharges out of the cavity. This ensures that the molten plastic can smoothly fill the cavity, resulting in a product with a high-quality appearance, improving the stability of the thin-walled product body quality, and increasing the yield rate. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 for Figure 1 A top-view structural diagram;

[0014] Figure 3 for Figure 2 Schematic diagram of section AA;

[0015] Figure 4 This is a schematic diagram of the structure of the lower mold core of this utility model;

[0016] Figure 5 This is a schematic diagram of the thin-walled product body structure of this utility model;

[0017] Figure 6 This is a top view of the thin-walled product body of this utility model.

[0018] Figure 7 This is a schematic diagram of the insert assembly of this utility model;

[0019] Figure 8 for Figure 7 Enlarged structural diagram at point B;

[0020] Figure 9 This is a schematic diagram of the main structure of the insert assembly of this utility model;

[0021] Figure 10 for Figure 9 Enlarged structural diagram at point C.

[0022] In the diagram: 1. Thin-walled product body; 2. Lower mold core; 3. Insert assembly; 4. Insert plate; 5. Sealing surface; 6. Primary venting channel; 7. Secondary venting channel. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] like Figures 1 to 10 As shown, a venting structure for thin-walled products is applied to an injection mold. The injection mold includes a lower mold core 2, and an upper mold core that rises and falls vertically above the lower mold core 2. A cavity is formed between the opposite end faces of the lower mold core 2 and the upper mold core. The cavity contains and forms the injection-molded thin-walled product body 1. The lower mold core 2 is provided with an insertion slot that communicates with the cavity. An insert assembly 3 is inserted into the insertion slot. The insert assembly 3 is provided with a venting structure. The venting structure includes multiple primary venting channels 6 located below the cavity of the injection mold. The primary venting channels 6 communicate with the cavity through a sealing gap. A secondary venting channel 7 is connected below the primary venting channels 6. The width of the primary venting channels 6 is greater than the width of the sealing gap, and the width of the primary venting channels 6 is less than the width of the secondary venting channels 7. Thus, the flow area of ​​the primary venting channels 6 is greater than the flow area of ​​the sealing gap, and the flow area of ​​the primary venting channels 6 is less than the flow area of ​​the secondary venting channels 7.

[0026] During injection molding, when molten plastic rapidly fills the mold cavity, the gas is compressed by the molten plastic and needs to be quickly discharged out of the cavity. At this time, the gas enters the primary venting channel 6 through the sealing gap, and then enters the secondary venting channel 7, and finally is discharged out of the cavity. This ensures that the molten plastic can smoothly fill the cavity, resulting in a thin-walled product body 1 with a high-quality appearance. This improves the stability of the quality of the thin-walled product body 1 and increases the yield rate.

[0027] By setting a certain venting structure on the lower mold core 2 of the lower mold plate, the air in the cavity can be quickly discharged, thereby solving the problem of filling difficulties during injection molding, reducing the probability of missing glue, and making the molten plastic fill the mold faster and more smoothly, improving the stability of the quality of the thin-walled product body 1, and increasing the yield rate.

[0028] The insert assembly 3 includes a plurality of insert plates 4 arranged in a row. The sealing gap, the primary exhaust channel 6 and the secondary exhaust channel 7 are all arranged between two adjacent insert plates 4. The sealing gap, the primary exhaust channel 6 and the secondary exhaust channel 7 are arranged sequentially from top to bottom.

[0029] The sealing gap is the sealing surface 5, and the height of the sealing surface 5 is 0.2mm. The sealing surface 5 can be an arc-shaped contact surface or a vertical direct contact surface. The sealing gap is set at the contact of the side walls of two adjacent insert plates 4. The sealing surface 5 is set to facilitate gas discharge while ensuring that the mold remains closed during injection molding to prevent molten plastic from overflowing. The appropriate size reduces the probability of flash on the plastic parts.

[0030] The sealing gap is formed by the partial contact of the side walls of two adjacent insert plates 4.

[0031] The width of the primary exhaust channel 6 ranges from 0.01mm to 0.05mm. The width of the primary exhaust channel 6 is the minimum distance between two insert plates 4 at the primary exhaust channel 6. The width of the primary exhaust channel 6 is preferably 0.01mm, that is, the distance between two adjacent insert plates 4 at the primary exhaust channel 6 is 0.01mm.

[0032] A first groove is provided on the side wall of the insert plate 4 at the primary exhaust channel 6, and the depth of the first groove is the width of the primary exhaust channel 6.

[0033] The width of the secondary exhaust channel 7 ranges from 0.1mm to 0.5mm. The width of the secondary exhaust channel 7 is the minimum distance between the two insert plates 4 at the secondary exhaust channel 7. The width of the secondary exhaust channel 7 is preferably 0.2mm, that is, the distance between two adjacent insert plates 4 at the secondary exhaust channel 7 is 0.2mm. The primary exhaust channel 6 is the "main channel" for gas discharge, which prioritizes the treatment of gas in the core area of ​​the cavity. The secondary exhaust channel is the "extended channel" for gas discharge, which facilitates the rapid discharge of air in the cavity. The primary exhaust channel 6 and the secondary exhaust channel 7 are set based on exhaust efficiency, exhaust position and functional priority to discharge gas in the mold cavity in stages and efficiently, avoiding defects in the plastic parts caused by gas retention.

[0034] A second groove is provided on the side wall of the insert plate 4 at the secondary exhaust channel 7, and the depth of the second groove is the width of the secondary exhaust channel 7.

[0035] The secondary exhaust channel 7 is connected to the external atmosphere of the mold via the transverse main exhaust groove on the back of the lower mold core 2. A 0.3mm stainless steel filter screen is installed at the outlet of the transverse main exhaust groove to prevent dust from being sucked back.

[0036] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0037] The embodiments of this utility model are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A venting structure for thin-walled products, applied to injection molds, characterized in that, The lower mold core of the injection mold is provided with an insert assembly, and the insert assembly is provided with a venting structure. The venting structure includes multiple primary venting channels located below the cavity of the injection mold. The primary venting channels are connected to the cavity through a sealing gap. A secondary venting channel is connected below the primary venting channel. The width of the primary venting channel is greater than the width of the sealing gap, and the width of the primary venting channel is less than the width of the secondary venting channel.

2. A vent structure for a thin-walled product according to claim 1, wherein The insert assembly includes multiple insert plates arranged in a row. The sealing gap, primary venting channel and secondary venting channel are all located between two adjacent insert plates, and the sealing gap, primary venting channel and secondary venting channel are arranged sequentially from top to bottom.

3. The venting structure for a thin-walled product according to claim 2, characterized in that, The sealing gap is the sealing surface, and the height of the sealing surface is 0.2mm.

4. A thin-walled product venting structure according to claim 3, wherein The sealing gap is formed by the partial contact of the side walls of two adjacent insert plates 4.

5. The thin-walled product venting structure of claim 2, wherein The width of the primary exhaust channel is 0.01 mm.

6. The thin-walled product venting structure of claim 2, wherein The width of the secondary exhaust channel is 0.2 mm.

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