Novel die structure for eliminating stress marks

Abstract

The utility model discloses a novel mould structure for eliminating stress marks, which comprises a mould base, a rear mould and a front mould, the rear mould is arranged between the mould base and the front mould, a product cavity is arranged between the rear mould and the front mould, an insert is fixedly arranged at the position of the product cavity of the rear mould, a first gas circuit is arranged at the position of the mould base, a second gas circuit communicated with the first gas circuit is arranged at the position of the rear mould, and the first gas circuit is communicated with the second gas circuit. The insert is provided with an annular gas path groove communicated with the second gas path, a gas path microgroove is communicated between the insert and the product cavity, and the gas path microgroove is communicated with the annular gas path groove. According to the utility model, the structural design of combining the air channel microgroove and the product cavity is adopted, and air pushes a thin-wall plastic product in the product cavity to extrude the front mold, so that sink marks on the surface of the thin-wall plastic product are flattened while cooling of the thin-wall plastic product is enhanced, and stress accumulated at the thin-wall plastic product is released; therefore, the stress mark at the thin-wall plastic product is effectively eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a novel mold structure for eliminating stress marks. Background Art

[0002] When injection molds are used to produce thin-walled plastic products, stress marks are easily generated on the surface of the thin-walled plastic products, resulting in poor molding of the plastic products. Additional processes need to be added to deal with the stress marks. The Chinese utility model patent with the authorization announcement number CN218928538U discloses a mold cooling water channel structure for solving the stress marks of thin-walled plastic products. It changes the series cooling water channel structure of the mother mold core, which can avoid the generation of stress marks at the junction of thick and thin. This structural design is suitable for larger thin-walled plastic products. However, for relatively small thin-walled plastic products, it is difficult to open multiple cooling water channels to pass through the products. The cooling water channels opened need to be particularly small, and the processing cost is relatively high. To this end, we propose a new mold structure for eliminating stress marks. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a new mold structure for eliminating stress marks.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a new mold structure for eliminating stress marks, including a mold base, a rear mold, and a front mold, the rear mold is arranged between the mold base and the front mold, a product cavity is arranged between the rear mold and the front mold, the rear mold is fixedly provided with an insert at the product cavity, a first air path is opened at the mold base, a second air path connected to the first air path is opened at the rear mold, an annular air path groove connected to the second air path is opened on the insert, an air path microgroove is connected between the insert and the product cavity, and the air path microgroove is connected to the annular air path groove.

[0005] It is further explained that one end of the first gas circuit is connected with a gas circuit connector, and the other end of the first gas circuit is connected to the second gas circuit.

[0006] To further explain, the paths of the first gas path and the second gas path are both at right angles.

[0007] It is further explained that a ventilation groove is provided at the connection point between the second air path and the annular air path groove, and the ventilation groove is arc-shaped.

[0008] It is further described that the width of the gas path microgroove is 0.03-0.05 mm.

[0009] The beneficial effect of the utility model is that the utility model adopts a structural design combining air path microgrooves with product cavities. Air is pumped in through the first air path and passes through the second air path, the ventilation groove, and the annular air path groove in sequence, and is finally injected into the air path microgrooves. During the injection, the air pushes the thin-walled plastic product in the product cavity to be extruded toward the front mold, and while strengthening the cooling of the thin-walled plastic product, the shrinkage marks on the surface of the thin-walled plastic product are flattened, and the accumulated stress at the thin-walled plastic product is released, thereby effectively eliminating the stress marks at the thin-walled plastic product. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a cross-sectional view of the internal structure of the utility model.

[0011] Figure 2 It is an enlarged schematic diagram of the internal structure of the utility model.

[0012] Figure 3 It is a structural schematic diagram of the utility model.

[0013] Figure numbers: 10, mold base; 11, first air path; 20, rear mold; 21, second air path; 30, front mold; 40, product cavity; 50, insert; 51, annular air path groove; 52, ventilation groove; 60, air path micro groove; 70, air path connector. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0015] Combined with Figure 1 To Attachment Figure 3 As shown, a new mold structure for eliminating stress marks includes a mold base 10, a rear mold 20, and a front mold 30. The rear mold 20 is arranged between the mold base 10 and the front mold 30. A product cavity 40 is arranged between the rear mold 20 and the front mold 30. When a thin-walled plastic product is injection molded, the thin-walled plastic product is formed in the product cavity 40. The rear mold 20 is fixedly provided with an insert 50 at the product cavity 40. A first air path 11 is opened at the mold base 10, and a second air path 21 connected to the first air path 11 is opened at the rear mold 20. The insert 50 is provided with an annular air path groove 51 connected to the second air path 21.

[0016] Combined with Figure 1 and attached Figure 2As shown, the paths of the first gas path 11 and the second gas path 21 are both in a right angle shape, one end of the first gas path 11 is connected with a gas path connector 70, the other end of the first gas path 11 is connected with the second gas path 21, and an arc-shaped ventilation groove 52 is provided at the connection between the second gas path 21 and the annular gas path groove 51. An air path micro groove 60 is connected between the insert 50 and the product cavity 40, and the air path micro groove 60 is connected with the annular gas path groove 51, and the groove width of the air path micro groove 60 is 0.03-0.05mm.

[0017] When working, combine with Figure 2 As shown, an air pump is connected to the air circuit connector 70. After the injection molding of the product cavity 40 is completed, the air pump starts to pump air into the first air circuit 11. The pumped air passes through the first air circuit 11 and the second air circuit 21, and enters the air circuit micro groove 60 through the ventilation groove 52. The air is injected into the product cavity 40 from the air circuit micro groove 60. When injected, the air pushes the thin-walled plastic product in the product cavity 40 to squeeze toward the front mold 30, and while strengthening the cooling of the thin-walled plastic product, it also flattens the shrinkage marks on the surface of the thin-walled plastic product. At this time, due to the gap between the thin-walled plastic product and the lower half of the product cavity at the rear mold 20, the accumulated stress at the thin-walled plastic product is released, thereby effectively eliminating the stress marks at the thin-walled plastic product.

[0018] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0019] It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0020] The above description does not limit the technical scope of the present invention. Any modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A new mold structure for eliminating stress marks, characterized in that: The invention comprises a mold base (10), a rear mold (20), and a front mold (30); the rear mold (20) is arranged between the mold base (10) and the front mold (30); a product cavity (40) is arranged between the rear mold (20) and the front mold (30); an insert (50) is fixedly arranged at the product cavity (40) of the rear mold (20); a first air path (11) is provided at the mold base (10); a second air path (21) connected to the first air path (11) is provided at the rear mold (20); an annular air path groove (51) connected to the second air path (21) is provided at the insert (50); an air path micro groove (60) is connected between the insert (50) and the product cavity (40); the air path micro groove (60) is connected to the annular air path groove (51).

2. A new mold structure for eliminating stress marks according to claim 1, characterized in that: One end of the first gas path (11) is connected to a gas path connector (70), and the other end of the first gas path (11) is connected to the second gas path (21).

3. A new mold structure for eliminating stress marks according to claim 2, characterized in that: The paths of the first gas path (11) and the second gas path (21) are both right-angled.

4. A new mold structure for eliminating stress marks according to claim 1, characterized in that: A ventilation groove (52) is provided at the connection point between the second air path (21) and the annular air path groove (51), and the ventilation groove (52) is arc-shaped.

5. The novel mold structure for eliminating stress marks according to claim 1 is characterized in that: The width of the gas path microgroove (60) is 0.03-0.05 mm.

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