Novel injection mold structure for foam molding

Abstract

The utility model discloses a novel injection mold structure for foam molding, which comprises a front mold and a rear mold, a cavity for product injection molding is arranged between the front mold and the rear mold, the front mold is provided with an air passage, the air passage extends to form a plurality of branch air holes penetrating through the front mold along the vertical direction, and the upper ends of the branch air holes are provided with plugging pieces. The lower ends of the branch air holes are directly communicated with the rear mold, the multiple branch air holes are communicated with one another, a sealing groove is formed around the cavity, a sealing ring is clamped in the sealing groove, the multiple branch air holes are distributed at intervals along the edge of the cavity, and the multiple branch air holes are all formed between the cavity and the sealing groove. By adopting the design of combining the air passages and the branch air holes, the foaming process of the foaming agent is stable and controllable, the situation that the foaming agent foams in advance can be avoided, and the foaming molding injection molding technology can be specifically realized and grounded.

Description

Technical Field

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

[0002] Conventional injection molded products are solid inside. When it is necessary to increase its own strength, the method of increasing the thickness is usually adopted, that is, the wall thickness of the product is thickened. However, in some applications with strict weight requirements, since increasing the wall thickness will also increase the weight of the product, it cannot be applied. In order to take into account the requirements of both strength and weight, a process concept for transforming the organizational structure of injection molded products has been proposed. For example, the Chinese invention patent application with patent application number CN201910820372.1 discloses a foaming process for EVA injection molded parts. However, how to improve the structural design of the injection mold to avoid the premature foaming of the foaming agent and enable the foaming molding injection molding technology to be specifically implemented and implemented is still being actively explored. Based on the experiments and verifications when improving the injection mold, we proposed a new injection mold structure for foaming. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a novel injection mold structure for foaming molding.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a new injection mold structure for foaming, comprising a front mold and a rear mold, a cavity for product injection molding is opened between the front mold and the rear mold, the front mold is opened with an air duct, the air duct extends with a plurality of branch air holes which penetrate the front mold in a vertical direction, the upper end of the branch air hole is provided with a sealing piece, the lower end of the branch air hole is directly connected to the rear mold, several branch air holes are connected with each other, a sealing groove is opened around the cavity, a sealing ring is clamped in the sealing groove, several branch air holes are spaced apart along the edge of the cavity, and several branch air holes are arranged between the cavity and the sealing groove.

[0005] It is further explained that an exhaust port is provided at one end of the airway, one of the branch air holes is connected to an inflation branch channel, and the inflation branch channel is provided with an inflation port.

[0006] It is further explained that the inflation port is fixedly connected with a pressure gauge.

[0007] It is further explained that a plurality of interlaced cooling water channels are provided in the front mold.

[0008] It is further explained that the rear mold is provided with a convex portion at the sealing groove of the front mold, and when the front mold and the rear mold are combined, the sealing groove of the front mold is buckled into the convex portion of the rear mold.

[0009] It is further described that the rear mold is also provided with branch air holes and cooling water channels.

[0010] The beneficial effect of the utility model is that the utility model adopts a combined design of air duct and branch pores, the foaming process of the foaming agent is stable and controllable, and the premature foaming of the foaming agent can be avoided, so that the foaming molding injection molding technology can be specifically realized and implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Figure 2 for Figure 1 Cross-sectional view at BB.

[0013] Figure 3 This is a schematic diagram of the structure of the front mold.

[0014] Figure numbers: 10, front mold; 11, air channel; 111, exhaust port; 112, inflation branch; 113, inflation port; 12, branch air hole; 13, plugging part; 14, sealing groove; 15, cooling water channel; 20, rear mold; 21, convex part; 30, sealing ring; 40, pressure gauge; A, cavity. DETAILED DESCRIPTION

[0015] 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.

[0016] Combined with Figure 1 To Attachment Figure 3 As shown, a new type of injection mold structure for foam molding includes a front mold 10 and a rear mold 20. A cavity A for product injection molding is opened between the front mold 10 and the rear mold 20. The front mold 10 is opened with an air channel 11. The air channel 11 extends with a plurality of branch air holes 12 that penetrate the front mold 10 in a vertical direction. A sealing piece 13 is provided at the upper end of the branch air hole 12. The lower end of the branch air hole 12 directly passes through the rear mold 20. The plurality of branch air holes 12 are interconnected, and the plurality of branch air holes 12 are spaced apart along the edge of the cavity A. The plurality of branch air holes 12 are arranged between the cavity A and the sealing groove 14.

[0017] Combined with Figure 3 As shown, an exhaust port 111 is provided at one end of the air channel 11, a branch air hole 12 is connected to an air charging branch channel 112, and the air charging branch channel 112 is provided with an air charging port 113. The air charging port 113 is fixedly connected with a barometer 40.

[0018] Combined with Figure 1 and attached Figure 2 As shown, a sealing groove 14 is formed around the cavity A, and a sealing ring 30 is clamped in the sealing groove 14. The rear mold 20 is provided with a convex portion 21 at the sealing groove 14 of the front mold 10. When the front mold 10 and the rear mold 20 are combined, as shown in the attached Figure 2 As shown, the sealing groove 14 of the front mold 10 is buckled into the convex portion 21 of the rear mold 20 , and the sealing ring 30 is clamped between the sealing groove 14 of the front mold 10 and the convex portion 21 of the rear mold 20 .

[0019] As attached Figure 1 As shown, Figure 1 The black dotted line in the middle is the branch pore 12. A plurality of interlaced cooling water channels 15 are provided in the front mold 10, as shown in the attached Figure 1 As shown, Figure 1 The solid grey line represents the cooling channel 15, which can cool the molten rubber during injection molding to solidify the mold. The rear mold 20 is also provided with branch pores and cooling channels.

[0020] The use of the new injection mold structure for foaming is as follows: before preparing the injection molded product for foaming, air is first injected into the cavity A through the air filling port 113, and the air fills all the branch pores 12, so that the air in the cavity A reaches 0.4MPa. The sealing ring 30 can prevent air leakage between the front mold 10 and the rear mold 20 at this time. When preparing the injection molded product for foaming, the rubber material and the foaming agent are mixed together and put into the barrel of the injection molding machine, and the screw of the injection molding machine squeezes the molten rubber material and the foaming agent into the cavity A synchronously.

[0021] Since air has been injected into the cavity A before, under the action of the air pressure of 0.4MPa, the foaming agent is suppressed by the air pressure and will not foam. After the molten rubber and the foaming agent are injected, a gap of about 1mm is slightly opened between the front mold 10 and the rear mold 20, and the high air pressure is extracted through the exhaust port 111 of the air channel 11. The foaming agent starts to foam after losing the suppression of the air pressure. The foaming agent will foam rapidly in the molten rubber, so that the molten rubber completely fills the entire cavity A, thereby finally completing the preparation of the foaming injection molding product.

[0022] 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.

[0023] 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 novel injection mold structure for foam molding, comprising a front mold (10) and a rear mold (20), wherein a cavity (A) for product injection molding is provided between the front mold (10) and the rear mold (20), characterized in that: The front mold (10) is provided with an air channel (11), and the air channel (11) extends with a plurality of branch air holes (12) that penetrate the front mold (10) in a vertical direction. The upper end of the branch air hole (12) is provided with a sealing piece (13), and the lower end of the branch air hole (12) directly passes through the rear mold (20). The plurality of branch air holes (12) are interconnected, and a sealing groove (14) is provided around the cavity (A). A sealing ring (30) is clamped in the sealing groove (14). The plurality of branch air holes (12) are spaced apart along the edge of the cavity (A), and the plurality of branch air holes (12) are arranged between the cavity (A) and the sealing groove (14).

2. A novel injection mold structure for foaming molding according to claim 1, characterized in that: An exhaust port (111) is provided at one end of the air channel (11), and one of the branch air holes (12) is connected to an air-filling branch channel (112), and the air-filling branch channel (112) is provided with an air-filling port (113).

3. A novel injection mold structure for foaming molding according to claim 2, characterized in that: The inflation port (113) is fixedly connected to a pressure gauge (40).

4. The novel injection mold structure for foaming molding according to claim 1, characterized in that: A plurality of interlaced cooling water channels (15) are provided in the front mold (10).

5. The novel injection mold structure for foaming molding according to claim 1, characterized in that: The rear mold (20) is provided with a convex portion (21) at the sealing groove (14) of the front mold (10); when the front mold (10) and the rear mold (20) are combined, the sealing groove (14) of the front mold (10) is buckled into the convex portion (21) of the rear mold (20).

6. A novel injection mold structure for foaming molding according to claim 4, characterized in that: The rear mold (20) is also provided with branch air holes and cooling water channels.

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